阅读说明：本技术 试剂喷射器 (Reagent injector ) 是由 阿比吉特·P·乌帕迪耶 艾伦·布罗克曼 于 2019-07-24 设计创作，主要内容包括：一种用于喷射试剂的喷射器(110,400,600,800,900)包括第一喷射器本体(202,402),所述第一喷洒器本体限定第一端(805)和第二端(807)。所述第一喷射器本体(202,402)进一步包括布置在所述第二端(807)附近的出口开口(228,428)。所述喷射器(110,400,600,800,900)进一步包括至少部分地被所述第一喷射器本体(202,402)封闭的阀组件(216,412)。所述阀组件(216,412)被配置用于将所述试剂选择性地分配穿过所述第一喷射器本体(202,402)的出口开口(228,428)。所述喷射器(110,400,600,800,900)进一步包括覆盖件构件(801),所述覆盖件构件联接至所述第一喷射器本体(202,402)并且适于至少部分地覆盖所述第一喷射器本体(202,402)的第二端(807)。所述覆盖件构件(801)包括一体凸缘部分(803),以用于将所述喷射器(110,400,600,800,900)安装在部件上。(An injector (110, 400, 600, 800, 900) for injecting a reagent includes a first injector body (202, 402) defining a first end (805) and a second end (807). The first injector body (202, 402) further includes an outlet opening (228, 428) disposed proximate the second end (807). The injector (110, 400, 600, 800, 900) further comprises a valve assembly (216, 412) at least partially enclosed by the first injector body (202, 402). The valve assembly (216, 412) is configured to selectively dispense the reagent through an outlet opening (228, 428) of the first injector body (202, 402). The injector (110, 400, 600, 800, 900) further comprises a cover member (801) coupled to the first injector body (202, 402) and adapted to at least partially cover the second end (807) of the first injector body (202, 402). The cover member (801) includes an integral flange portion (803) for mounting the injector (110, 400, 600, 800, 900) on a component.)

1. An injector (110, 400, 600, 800, 900) for injecting a reagent, the injector (110, 400, 600, 800, 900) comprising:

a first injector body (202, 402) defining a first end (805) and a second end (807), the first injector body (202, 402) further comprising an outlet opening (228, 428) disposed proximate the second end (807);

a valve assembly (216, 412) at least partially enclosed by the first injector body (202, 402), wherein the valve assembly (216, 412) is configured for selectively dispensing the reagent through an outlet opening (228, 428) of the first injector body (202, 402); and

a cover member (801) coupled to the first injector body (202, 402) and adapted to at least partially cover a second end (807) of the first injector body (202, 402), the cover member (801) including an integral flange portion (803) for mounting the injector (110, 400, 600, 800, 900) on a component.

2. The eductor (110, 400, 600, 800, 900) of claim 1, wherein the cover member (801) further comprises a cup portion (818), and wherein the cup portion (818) and the first eductor body (202, 402) further define a fluid chamber (232, 824).

3. The injector (110, 400, 600, 800, 900) of claim 2, further comprising:

a fluid inlet (236) in fluid communication with the fluid chamber (232, 824); and

with said fluid

The chamber (232, 824) is in fluid communication with a fluid outlet (238).

4. The injector (110, 400, 600, 800, 900) of claim 3, wherein the fluid inlet (236) is arranged to receive a fluid different from the reagent.

5. The injector (110, 400, 600, 800, 900) of claim 2, wherein the first injector body (202, 402) further includes a conduit portion (226) defining the outlet opening (228, 428), and wherein the cup portion (818) of the cover member (801) further defines a cover aperture (820) adapted to at least partially receive the conduit portion (226).

6. The injector (110, 400, 600, 800, 900) of claim 1, wherein the flange portion (803) of the cover member (801) further defines at least one mounting hole (828).

7. The injector (110, 400, 600, 800, 900) of claim 1, further comprising: a second injector body (204) coupled to the first injector body (202, 402), the second injector body (204) including a reagent tube (240).

8. The injector (110, 400, 600, 800, 900) of claim 7, further comprising: a spring member (206, 406, 602, 802) positioned between the first injector body (202, 402) and the second injector body (204), wherein the spring member (206, 406, 602, 802) is adapted to allow the second injector body (204) to move relative to the first injector body (202, 402) in response to the reagent expanding during freezing.

9. An injector (110, 400, 600, 800, 900) for injecting a reagent, the injector (110, 400, 600, 800, 900) comprising:

a first injector body (202, 402) defining a first end (805) and a second end (807), the first injector body (202) further comprising an outlet opening (228, 428) disposed proximate the second end (807);

a second injector body (204) coupled to the first injector body (202, 402), the second injector body (202) including a reagent tube (240);

a valve assembly (216, 412) at least partially enclosed by the first injector body (202, 402), wherein the valve assembly (216, 412) is configured for selectively dispensing the reagent through an outlet opening (228, 428) of the first injector body (202, 402); and

a cover member (801) coupled to the first injector body (202, 402) and adapted to at least partially cover a second end (807) of the first injector body (202, 402), the cover member (801) including an integral flange portion (803) for mounting the injector (110, 400, 600, 800, 900) on a component.

10. The eductor (110, 400, 600, 800, 900) of claim 9, wherein the cover member (801) further comprises a cup portion (818), and wherein the cup portion (818) and the first eductor body (202, 402) further define a fluid chamber (232, 824).

11. The injector (110, 400, 600, 800, 900) of claim 10, further comprising:

a fluid inlet (236) in fluid communication with the fluid chamber (232, 824); and

a fluid outlet (238) in fluid communication with the fluid chamber (232, 824).

12. The injector (110, 400, 600, 800, 900) of claim 11, wherein the fluid inlet (236) is arranged to receive a fluid different from the reagent.

13. The injector (110, 400, 600, 800, 900) of claim 10, wherein the first injector body (202, 402) further includes a conduit portion (226) defining the outlet opening (228, 428), and wherein the cup portion (818) of the cover member (801) further defines a cover aperture (820) adapted to at least partially receive the conduit portion (226).

14. The injector (110, 400, 600, 800, 900) of claim 9, wherein the flange portion (803) of the cover member (801) further defines at least one mounting hole (828).

15. The injector (110, 400, 600, 800, 900) of claim 9, further comprising: a spring member (206, 406, 602, 802) positioned between the first injector body (202, 402) and the second injector body (204), wherein the spring member (206, 406, 602, 802) is adapted to allow the second injector body (204) to move relative to the first injector body (202, 402) in response to the reagent expanding during freezing.

16. An injector (110, 400, 600, 800, 900) for injecting a reagent, the injector (110, 400, 600, 800, 900) comprising:

a first injector body (202, 402) defining a first end (805) and a second end (807), the first injector body (202) further comprising an outlet opening (228, 428) disposed proximate the second end (807);

a second injector body (204) coupled to the first injector body (202, 402), the second injector body (204) including a reagent tube (240);

a valve assembly (216, 412) at least partially enclosed by the first injector body (202, 402), wherein the valve assembly (216, 412) is configured for selectively dispensing the reagent through an outlet opening (228, 428) of the first injector body (202, 402); and

a cover member (801) coupled to the first injector body (202, 402), the cover member (801) comprising:

a cup portion (818) adapted to at least partially cover a second end (807) of the first eductor body (202, 402), wherein the cup portion (818) and the first eductor body (202, 402) define a fluid chamber (232, 824); and

the injector (110, 400, 600, 800, 900) is mounted on a flange portion (803) on the component, wherein the flange portion (803) is integral with the cup portion (818).

17. The injector (110, 400, 600, 800, 900) of claim 16, further comprising:

a fluid inlet (236) in fluid communication with the fluid chamber (232, 824); and

a fluid outlet (238) in fluid communication with the fluid chamber (232, 824).

18. The injector (110, 400, 600, 800, 900) of claim 17, wherein the fluid inlet (236) is arranged to receive a fluid different from the reagent.

19. The injector (110, 400, 600, 800, 900) of claim 16, wherein the first injector body (202, 402) further includes a conduit portion (226) defining the outlet opening (228, 428), and wherein the cup portion (818) of the cover member (801) further defines a cover aperture (820) adapted to at least partially receive the conduit portion (226).

20. The injector (110, 400, 600, 800, 900) of claim 16, further comprising: a spring member (206, 406, 602, 802) positioned between the first injector body (202, 402) and the second injector body (204), wherein the spring member (206, 406, 602, 802) is adapted to allow the second injector body (202, 402) to move relative to the first injector body (204) in response to the reagent expanding during freezing.

Technical Field

The present disclosure relates to injectors, and more particularly to an injector for injecting a reagent into an exhaust stream of an engine.

Background

Lean burn engines provide improved fuel efficiency by operating with excess oxygen, i.e., greater than the amount of oxygen required for complete combustion of the available fuel. Such engines are referred to as running "lean" or "lean mixture". However, this improvement or increase in fuel economy is offset by undesirable polluting emissions, particularly in the form of nitrogen oxides (NOx), as compared to non-lean combustion.

One method for reducing NOx emissions from lean-burn internal combustion engines is known as Selective Catalytic Reduction (SCR). SCR (e.g., when used to reduce NOx emissions from diesel engines) involves injecting an atomized reagent into the exhaust stream of an engine in association with one or more selected engine operating parameters, such as exhaust gas temperature, engine Revolutions Per Minute (RPM), or engine load as measured by engine fuel flow, turbo boost pressure, or exhaust NOx mass flow. The reagent/exhaust gas mixture is passed through a reactor containing a catalyst, such as activated carbon or a metal (such as platinum, vanadium or tungsten) capable of reducing the NOx concentration in the presence of the reagent. Typically, an injector is used to inject a reagent into the exhaust stream of an engine.

Aqueous urea is known as an effective agent for use in SCR systems of diesel engines. However, the use of such an aqueous urea solution involves a number of disadvantages. One of the disadvantages is that the aqueous urea solution expands under freezing conditions due to the formation of ice. Aqueous urea solutions may be prone to freezing in certain situations, such as, for example, cold weather. The expansion of the aqueous urea solution under icing conditions may damage one or more components of the injector. The injector may then have to be repaired or replaced, resulting in downtime and increased costs. Reagent freezing may also lead to injector failure, resulting in undesirable deposits in the exhaust system. Similarly, any other fluid delivery components may be damaged by the fluid freezing.

Accordingly, it may be desirable to provide an improved reagent injector that addresses some or all of these issues.

Disclosure of Invention

In one aspect of the present disclosure, an injector for injecting a reagent is provided. The injector includes a first injector body defining a first end and a second end. The first injector body further includes an outlet opening disposed proximate the second end. The injector further includes a valve assembly at least partially enclosed by the first injector body. The valve assembly is configured to selectively dispense the reagent through an outlet opening of the first injector body. The sprayer further includes a cover member coupled to the first sprayer body and adapted to at least partially cover the second end of the first sprayer body. The cover member includes an integral flange portion for mounting the sprayer on a component.

In another aspect of the present disclosure, an injector for injecting a reagent is provided. The injector includes a first injector body defining a first end and a second end. The first injector body further includes an outlet opening disposed proximate the second end. The injector further includes a second injector body coupled to the first injector body. The second injector body includes a reagent tube. The injector further includes a valve assembly at least partially enclosed by the first injector body. The valve assembly is configured to selectively dispense the reagent through an outlet opening of the first injector body. The sprayer further includes a cover member coupled to the first sprayer body and adapted to at least partially cover the second end of the first sprayer body. The cover member includes an integral flange portion for mounting the sprayer on a component.

In one aspect of the present disclosure, an injector for injecting a reagent is provided. The injector includes a first injector body defining a first end and a second end. The first injector body further includes an outlet opening disposed proximate the second end. The injector further includes a second injector body coupled to the first injector body. The second injector body includes a reagent tube. The injector further includes a valve assembly at least partially enclosed by the first injector body. The valve assembly is configured to selectively dispense the reagent through an outlet opening of the first injector body. The injector further includes a cover member coupled to the first injector body. The cover member includes a cup portion adapted to at least partially cover the second end of the first sprayer body. The cup portion and the first injector body define a fluid chamber. The cover member further includes a flange portion for mounting the sprayer on a component. The flange portion is integral with the cup portion.

Other features and aspects of the present disclosure will become apparent from the following description and the accompanying drawings.

Drawings

FIG. 1 is a schematic diagram depicting an exemplary exhaust aftertreatment system including a reagent injector according to an aspect of the present disclosure;

FIG. 2 is a perspective view of a reagent injector according to one aspect of the present disclosure;

FIG. 3 is a top view of the reagent injector of FIG. 2;

FIG. 4 is a cross-sectional view of the reagent injector of FIG. 2;

FIG. 5 is another cross-sectional view of the reagent injector of FIG. 2;

FIG. 6 is yet another cross-sectional view of the reagent injector of FIG. 2;

FIG. 7 is a cross-sectional view of the reagent injector of FIG. 2 in an extended configuration, according to an aspect of the present disclosure;

FIG. 8 is a perspective view of a reagent injector according to another aspect of the present disclosure;

FIG. 9 is a cross-sectional view of the reagent injector of FIG. 8;

FIG. 10 is another cross-sectional view of the reagent injector of FIG. 8;

FIG. 11 is a cross-sectional view of the reagent injector of FIG. 8 in an extended configuration, according to an aspect of the present disclosure;

FIG. 12 is a cross-sectional view of a reagent injector according to another aspect of the present disclosure;

FIG. 13 is a cross-sectional view of the reagent injector of FIG. 12 in an extended configuration, according to an aspect of the present disclosure;

FIG. 14 is a perspective view of a reagent injector according to another aspect of the present disclosure;

FIG. 15 is a perspective view of a cover member of a reagent injector according to another aspect of the present disclosure;

FIG. 16 is a cross-sectional view of the reagent injector of FIG. 14;

FIG. 17 is a cross-sectional view of the reagent injector of FIG. 14 in an extended configuration, according to an aspect of the present disclosure; and

FIG. 18 is a perspective view of a reagent injector according to another aspect of the present disclosure.

DETAILED DESCRIPTION OF EMBODIMENT (S) OF INVENTION

Exemplary embodiments will now be described more fully with reference to the accompanying drawings.

It should be understood that while the present teachings may be described in connection with diesel engines and reduction of nitrogen oxide (NOx) emissions, the present teachings may be used in connection with any of a number of exhaust streams, such as an exhaust stream from (by way of non-limiting example) gasoline, a turbine, a fuel cell, a jet aircraft, or any other power source that outputs an exhaust stream. Further, the present teachings may be used in reducing any of a variety of undesirable emissions.

Wherever possible, the same reference numbers will be used throughout the drawings to refer to the same or like parts. FIG. 1 illustrates an exemplary exhaust system 100 for an engine 102. In fig. 1, solid lines between elements of the exhaust system 100 represent fluid lines, while dashed lines represent electrical connections. The engine 102 may be in communication with a fuel source that, once consumed, produces exhaust gases that are discharged into an exhaust conduit or pipe 106 having an exhaust aftertreatment system 108. The exhaust aftertreatment system 108 may include an exhaust treatment component 112 disposed downstream of the engine 102. In the illustrated embodiment, the exhaust treatment component 112 includes a Selective Catalytic Reduction (SCR) component 114. The SCR component 114 may include a catalyst bed for catalytic reduction of NOx emissions in the exhaust stream. However, in other embodiments, the exhaust treatment component 112 may also include a Diesel Oxidation Catalyst (DOC) and a Diesel Particulate Filter (DPF). Exhaust treatment component 112 may further include components such as a thermal enhancement device or burner 116 for increasing the temperature of the exhaust gases passing through exhaust conduit 106. Increasing the temperature of the exhaust gas facilitates light-off of a catalyst in the exhaust treatment component 112 during cold weather conditions and when starting the engine 102, and activates regeneration of the exhaust treatment component 112 when the exhaust treatment component 112 includes a DPF.

To assist in reducing the emissions produced by the engine 102, the exhaust aftertreatment system 108 includes an injector 110 for periodically dosing an exhaust aftertreatment fluid or agent into the exhaust flow of the engine 102. Injector 110 may be positioned upstream of exhaust treatment component 112 and operable to inject a reagent into the exhaust flow. Injector 110 is in fluid communication with reagent reservoir 120 and pump 122 via supply line 124. Optionally, a filter (not shown) may be provided between the pump 122 and the reagent tank 120. The reagent may be a urea solution, Diesel Exhaust Fluid (DEF),Or the like. It should also be understood thatOr multiple agents may be used in the system and may be used alone or in combination. While fig. 1 illustrates a single injector 110, the present disclosure also contemplates a plurality of such injectors 110. In another embodiment, the ejector 110 may also be used with an air-assisted ejector.

The amount of reagent required may vary with load, engine Revolutions Per Minute (RPM), engine speed, exhaust temperature, exhaust flow, engine fuel injection timing, barometric pressure, relative humidity, engine coolant temperature, Exhaust Gas Recirculation (EGR) rate, and NOx reduction required. A NOx sensor or meter 118 is positioned downstream of the SCR component 114. The NOx sensor 118 is operable to output a signal indicative of exhaust NOx content to an Engine Control Unit (ECU) 126. All or some of the engine operating parameters may be provided to the electronic injection controller 128 from the ECU 126 via the engine/vehicle data bus. The electronic injection controller 128 may also be included as part of the ECU 126. Exhaust temperature, exhaust flow, and exhaust back pressure may be measured by respective sensors (not shown). The electronic injection controller 128 may control the injector 110 to regulate injection of the reagent into the exhaust stream of the engine 102.

Temperature sensitive agents, such as aqueous urea solutions, tend to solidify when exposed to high temperatures of 300 ℃ to 650 ℃ (temperatures that may be experienced in an engine exhaust system). It may be desirable to maintain the reagent below 140 ℃, and preferably in a lower operating range between 5 ℃ and 95 ℃, to ensure that urea solidification is prevented. The solidified urea, if allowed to form, may contaminate moving parts, the openings and passageways of the injector 110. To maintain a lower operating temperature, the injector 110 may be supplied with a fluid that acts as a coolant. In the illustrated embodiment, the fluid is different from the reagent and is supplied by the cooling system 130. In an embodiment, the cooling system 130 may be an engine coolant system and may include a number of different components, such as a radiator, a fan, a fluid reservoir, a fluid conduit, one or more valves, and the like. In such a case, the fluid may be water or an aqueous solution. Fluid may be supplied to the injector 110 via a fluid supply line 132. The fluid return line 134 allows fluid to return to the cooling system 130 for cooling and recirculation. One or more components (e.g., valves, filters, etc.) may be disposed in the fluid supply line 132 and/or the fluid return line 134. In an embodiment, the cooling system 130 may include a dedicated pump for supplying fluid to the injector 110. The pump may be controlled based on the temperature of the reagent.

Although fig. 1 illustrates a single cooling system 130 for the injector 110, alternative cooling configurations are also contemplated within the scope of the present disclosure. In an embodiment, the reagent may be recirculated within the injector 110 to provide cooling. Instead of a cooling system 130, a return line (not shown) may be provided between injector 110 and reagent tank 120 to ensure reagent recirculation. The configuration of the injector 110 may vary accordingly.

In some situations, such as cold ambient temperatures, the reagent supplied to the injector 110 may be prone to freezing. Reagents such as aqueous urea tend to swell during freezing. This expansion in ice conditions is due to the formation of ice. This expansion of the reagent may damage one or more components of the injector 110 due to the pressure exerted by the ice. An injector 110 according to the present disclosure incorporates a freeze protection feature to allow reagent expansion in the extended configuration while preventing any damage to the injector 110. This freeze protection feature may further allow the injector 110 to move back to the normal configuration as the reagent (i.e., ice) melts.

The injector 110 is further described with reference to fig. 2-7. An injector 110 is provided to inject a reagent into the exhaust stream of the engine 102 (shown in FIG. 1). Injector 110 includes a first injector body 202 (hereinafter "first body 202"), a second injector body 204 (hereinafter "second body 204"), a spring member 206, an electronic connector housing 210 (hereinafter "connector housing 210"), a fluid inlet tube 212, a fluid outlet tube 214, and a valve assembly 216. The injector 110 may define a longitudinal axis 'L' extending along a length of the injector 110.

The first body 202 may be substantially hollow and at least partially enclose the valve assembly 216. In addition, the top and bottom ends of the first body 202 may be open. The cap 218 may at least partially cover a top end of the first body 202. The bottom end of the first body 202 may be covered with a bottom cover 220. The mounting flange 222 is further connected to the bottom end of the first body 202. The first body 202 includes an extension 223 for coupling with the mounting flange 222. The mounting flange 222 defines a plurality of flange apertures 224. The flange apertures 224 enable the mounting flange 222 to be mounted on the row duct 106 (shown in FIG. 1) via mechanical fasteners, such as bolts. In alternative embodiments, the mounting flange 222 may be integral with the first body 202. The first body 202 also includes a conduit portion 226 at the bottom end. The conduit portion 226 may have a hollow configuration. The conduit portion 226 defines an outlet opening 228 for discharging the reagent. The bottom cover 220 and the mounting flange 222 may be coupled to the first body 202 via a number of different methods (e.g., welding, brazing, adhesives, mechanical fasteners, interference fit, etc.). In an embodiment, the bottom cover 220 and/or the mounting flange 222 may be detachably connected to the first body 202.

The first body 202 further includes an upper portion 227. The upper portion 227 includes a connector opening 229 for receiving the connector housing 210 therethrough. The extension 223 may extend from the upper portion 227. Conduit portion 226 may also extend from upper portion 227. The cap 218 may be disposed on the upper portion 227.

In the illustrated embodiment, the first body 202 further includes a recessed portion 230 near the bottom end. The recessed portion 230 and the bottom cap 220 may together define a fluid chamber 232. The fluid chamber 232 may at least partially surround the conduit portion 226. The first body 202 further includes a pair of receiving portions 234 for at least partially receiving the fluid inlet tube 212 and the fluid outlet tube 214. The receiving portion 234 may be implemented as a boss extending from the first body 202. The receiving portions 234 may be angularly spaced apart from one another on an outer surface of the first body 202. The fluid inlet tube 212 and the fluid outlet tube 214 may be connected to the respective receiving portions 234 of the first body 202 via a number of different methods (e.g., welding, brazing, adhesives, mechanical fasteners, interference fit, etc.). In an embodiment, fluid inlet tube 212 and fluid outlet tube 214 may be removably connected to first body 202. The receiving portion 234 may also be inclined with respect to the longitudinal axis 'L' of the injector 110. Accordingly, fluid inlet tube 212 and fluid outlet tube 214 may also be inclined with respect to longitudinal axis 'L'.

Fluid inlet tube 212 and fluid outlet tube 214 may be hollow tubes that allow fluid flow therethrough. Fluid inlet tube 212 and fluid outlet tube 214 may be in fluid communication with fluid chamber 232. Additionally, fluid inlet tube 212 defines a fluid inlet 236 disposed in fluid communication with fluid chamber 232. Similarly, fluid outlet tube 214 defines a fluid outlet 238 disposed in fluid communication with fluid chamber 232. The fluid inlet 236 may be arranged to receive a fluid different from the reagent. In an embodiment, the fluid may be a coolant (e.g., water). The fluid inlet 236 may receive fluid from the cooling system 130 (shown in fig. 1) via the fluid supply line 132. The introduction and discharge of fluid is indicated by arrows 'a 1' in fig. 3. Additionally, the fluid outlet 238 may discharge fluid to the fluid return line 134. Fluid may flow through fluid inlet tube 212 into fluid chamber 232, as indicated with exemplary fluid flow path 'F' of fig. 5. The fluid passage 239 of the fluid inlet tube 212 may be in fluid communication with the angled bore 245 of the first body 202. The angled bore 245 is in fluid communication with the fluid chamber 232. Additionally, fluid in the fluid chamber 232 may exit the injector 110 through the fluid outlet tube 214. The flow passage (not shown) of fluid outlet tube 214 may be in fluid communication with another angled bore (not shown) of first body 202. The angled bore may be in fluid communication with the fluid chamber 232. The fluid in the fluid chamber 232 may cool the conduit portion 226 of the first body 202. Accordingly, one or more components of the valve assembly 216 that are at least partially received within the conduit portion 226 may be cooled. The reagent flowing through conduit portion 226 may also be cooled. This can significantly prevent the agent from being solidified due to the high temperature of the exhaust system 100 and improve the operability of the injector 110.

The second body 204 includes a reagent tube 240. The reagent tube 240 may be oriented substantially parallel to the longitudinal axis 'L'. Additionally, the reagent tube 240 may be substantially hollow, with an open end. Reagent tube 240 may receive reagent from pump 122 (shown in fig. 1) via supply line 124. Reagent tube 240 further receives reagent at reagent inlet 241. Reagent tube 240 includes an inlet filter 242 through which reagent passes. The second body 204 further includes a flange section 243 extending from the reagent tube 240. The flange section 243 may have a stepped configuration and include an upper surface 244.

In an embodiment, the second body 204 may be movable relative to the first body 202. In addition, the second body 204 may be movable along an axial direction 'D' that is substantially parallel to the longitudinal axis 'L' of the injector 110. The spring member 206 is positioned between the first body 202 and the second body 204. Additionally, a spring member 206 may movably connect the second body 204 to the first body 202. In an embodiment, the spring member 206 may be a substantially flat spring. Additionally, the spring member 206 may be formed by at least one stamping or molding process. In further embodiments, the spring member 206 may be made of a metal or metal alloy. The spring member 206 includes a main portion 246, at least one elongated portion 248, and at least one intermediate portion 250 disposed between the main portion 246 and the at least one elongated portion 248. In the illustrated embodiment, the spring member 206 includes a pair of elongated portions 248 and a pair of intermediate portions 250. In alternative embodiments, each of the pair of elongated portions 248 may have a zigzag shape to provide additional travel of the second body 204. Each of the pair of intermediate portions 250 is disposed between the main portion 246 and the corresponding elongate portion 248. The main portion 246 is arranged on the flange section 243 of the reagent tube 240. In addition, the main portion 246 is pressed against the upper surface 244 of the flange section 243. In another embodiment, the main portion 246 may be connected to a substantially circular region of the flange section 243 of the reagent tube 240. The main portion 246 may have an annular shape defining a main orifice 252. Although in the illustrated embodiment, the primary orifice 252 has a substantially circular shape, other shapes of the primary orifice 252 are contemplated within the scope of the present disclosure. Such shapes of the main aperture 252 may include polygons, ovals, and the like. The main orifice 252 is arranged to at least partially surround the reagent tube 240. Thus, the main aperture 252 allows the reagent tube 240 to extend therethrough. In an embodiment, the main portion 246 may be press fit onto the flange section 243 of the second body 204. In other embodiments, the main portion 246 may be attached to the second body 204 by a number of different methods (e.g., welding, brazing, adhesives, mechanical fasteners, etc.). In another embodiment, the main portion 246 may be removably coupled to the second body 204.

The intermediate portion 250 may extend from diametrically opposite sides of the main portion 246. In the undeformed or normal state, the intermediate portion 250 has a curvilinear shape that extends upwardly from the main portion 246 and then curves downwardly toward the respective elongated portion 248. Specifically, each intermediate portion 250 includes a first section 250a extending upwardly from the main portion 246 and a second section 250b that curves downwardly and meets the respective elongated portion 248. In an embodiment, the first section 250a may have a substantially planar shape. In the undeformed state or configuration, the first section 250a is further inclined at an angle 'Ag' (shown in fig. 6) relative to the main portion 246. The second section 250b has a curved shape and connects the first section 250a to the respective elongated portion 248. Each intermediate portion 250 is adapted to deform to allow the second body 204 to move relative to the first body 202. In particular, each intermediate portion 250 deforms to allow the second body 204 to move away from the first body 202 along the axial direction 'D'. As shown in fig. 7, in the deformed state or configuration, the first segment 250a is oriented substantially parallel to the main portion 246, i.e., the angle therebetween is substantially zero. After each intermediate portion 250 deforms or flexes to a point where the first segment 250a is oriented substantially parallel to the main portion 246, the spring member 206 may limit the maximum axial movement of the second body 204 relative to the first body 202. Distance 'D1' (shown in fig. 7) may correspond to a maximum axial movement of second body 204 relative to first body 202. The distance 'D1' may be the distance between the second body 204 and the pole piece 256.

Each elongate portion 248 includes a first region 248a, a second region 248b, and a third region 248c disposed between the first and second regions 248a, 248 b. The first regions 248a extend from the second sections 250b of the respective intermediate portions 248. The second region 248b may be connected to the first body 202. The first region 248a and the second region 248b may each have a substantially planar shape. In the illustrated embodiment, the width 'W1' (shown in fig. 2) of the first region 248a is greater than the width 'W2' of the second region 248 b. In addition, the third region 248c has a tapered shape and connects the first region 248a to the second region 248 b. In an embodiment, the second region 248b of the elongated portion 248 is connected to the first body 202 by welding. In other embodiments, the second region 248b may be attached to the first body 202 by a number of different methods (e.g., brazing, mechanical fasteners, adhesives, etc.). In some embodiments, the first region 248a and/or the third region 248c of the elongate portion 248 may also be connected to the first body 202 by a number of different methods. In another embodiment, each elongated portion 248 may be removably connected to the first body 202 by a non-permanent joining method. Such a detachable connection may enable second body 204 to be removed from first body 202, thereby allowing for repair and/or replacement of one or more internal components of injector 110 (e.g., valve assembly 216). In further embodiments, each elongated portion 248 may be connected to the first body 202 by a snap-fit connection.

In an embodiment, the spring member 206 is preloaded to bias the second body 204 toward the first body 202. In another embodiment, the spring member 206 is further configured to bias or urge the valve assembly 216 toward the first body 202. The second body 204 may be biased to move against the spring member 206 in response to expansion of the reagent during freezing. The spring member 206 is further configured to limit maximum movement of the second body 204 relative to the first body 202 in response to expansion of the reagent during freezing. In particular, the spring member 206 may apply a biasing force 'Fb' to resist the pressure 'P' applied by the reagent during freezing. The agent may swell under ice conditions due to the formation of ice. Thus, the expansion of the agent is caused by the expansion of the ice. The pressure 'P' is exerted by the ice formed as the reagent is frozen. In an embodiment, the limit of movement of the second body 204 may be an end stop.

The valve assembly 216 (shown in fig. 4-7) includes an electromagnet 254, a pole piece 256, an outer tube 258, an inner tube 260, a valve member 262, a return spring 264, a seat member 266, a nozzle portion 268, and an end member 270. In an embodiment, the valve assembly 216 may be a removable or replaceable cartridge assembly. Accordingly, valve assembly 216 may be removed from injector 110 and replaced with another valve assembly, if desired. In an alternative embodiment, valve assembly 216 may be non-removable from injector 110. The valve assembly 216 is configured for selectively dispensing reagent through the outlet opening 228 of the first body 202.

The electromagnet 254 includes a coil 272, a bobbin 274, a tube 276, and an end cap 278. The electromagnet 254 may be disposed within the first body 202. The coil 272 comprises a wire coil wound on a bobbin 274. The tube 276 at least partially surrounds the bobbin 274. The tube 276 may be supported on a shoulder of the first body 202. An end cap 278 at least partially covers the bobbin 274 and the tube 276 from the top. The end caps 278 and the tubes 276 may constitute a flux frame for the electromagnet 254. The connector housing 210 is connected to the electromagnet 254. Specifically, the connector housing 210 may be connected to the flux frame of the electromagnet 254. A retaining ring 280 may be disposed within a groove of the connector housing 210. The retention ring 280 may further be supported on another shoulder of the first housing 202. Retention ring 280 may retain and/or support connector housing 210 within first housing 202. In another embodiment, the connector housing 210 may be overmolded onto the electromagnet 254. In other embodiments, the connector housing 210 may be connected to the electromagnet 254 by a number of different methods (e.g., welding, brazing, mechanical fasteners, adhesives, interference fit, etc.). In an embodiment, the connector housing 210 may be detachably connected to the electromagnet 254. Power may be provided to the coil 272 via one or more wires (not shown) passing through the connector housing 210. The coil 272 may be energized in response to a signal from the electronic injection controller 128. A sealing element 282 (e.g., an O-ring) is also mounted between the tube 276 and the first body 202. The sealing element 282 may prevent any leakage of reagent and/or exhaust.

The pole piece 256 may be at least partially received within the electromagnet 254 and the connector housing 210. The pole piece 256 defines an aperture 284 extending therethrough. In the illustrated embodiment, the bore 284 is a counterbore. The aperture 284 is in fluid communication with a passage 286 of the reagent tube 240. Additionally, reagent tube 240 is at least partially received within a wider portion of bore 284 of pole piece 256. A sealing member 287 is disposed between the second body 204 and the valve assembly 216. Specifically, a seal member 287 is disposed between reagent tube 240 and pole piece 256. In another embodiment, a sealing member 287 may be disposed between the first body 202 and the second body 204. The sealing member 287 may be an O-ring. Additionally, a seal member 287 is received in the groove 289 of the pole piece 256. In an alternative embodiment, the sealing member 287 may be received in a groove (not shown) of the reagent vessel 240. The seal member 287 may prevent leakage of reagent from the injector 110. In response to expansion of the reagent during freezing, the second body 204 including the reagent tube 240 may be displaced from the first body 202. The spring member 206 may limit axial movement of the second body 204. In the displaced state, as shown in fig. 7, reagent tube 240 and pole piece 256 may define an expansion chamber 291 therebetween. Expansion chamber 291 may allow the reagent to expand during freezing. Thus, the expansion chamber 291 may serve as a reservoir for frozen reagent. In particular, the expansion chamber 291 may serve as a reservoir for ice formed as a result of freezing of the reagent. Since the ice is allowed to expand, damage to various parts of the ejector 110 may be prevented. In addition, the sealing member 287 may prevent any leakage of reagent from the expansion chamber 291. The volume of expansion chamber 291 can be optimized to allow for proper expansion of ice formed under freezing conditions of the reagent.

The inner tube 260 defines an aperture 288 in fluid communication with the aperture 284 of the pole piece 256. In an embodiment, the inner tube 260, the pole piece 256, and the reagent tube 240 may be coaxially aligned with one another. In an embodiment, the inner tube 260 may be made of a magnetic material (e.g., 430 stainless steel) such that energization of the coil 272 generates a magnetic field to propel the inner tube 260 toward the pole piece 256.

A return spring 264 is received between the pole piece 256 and a corresponding shoulder of the inner tube 260. Additionally, an inner tube 260 is enclosed within the outer tube 258. The outer tube 258 is at least partially received within the electromagnet 254 and the conduit portion 226 of the first body 202. The inner tube 260 further defines a plurality of tube apertures 292. These tube apertures 292 may be through-holes defined in the wall of the inner tube 260. In an embodiment, the inner tube 260 may include two such tube apertures 292 positioned diametrically opposite each other. Tube apertures 292 may allow fluid communication between tube apertures 288 and lumen chamber 294. The tube chamber 294 may be at least partially defined by the bore of the outer tube 258.

One end of the valve member 262 is connected to the inner tube 260. The valve member 262 may be connected to the inner tube 260 via a number of different methods (e.g., welding, adhesives, interference fits, brazing, mechanical fasteners, etc.). The valve member 262 may further include a flange that supports an end of the inner tube 260. The return spring 264 normally urges the inner tube 260 and the valve member 262 against the valve seat of the seat member 266. In the closed position, the plug portion of the valve member 262 rests on the valve seat and closes the seat bore of the seat member 266. The plug portion may be disposed at an end of the stem of the valve member 262. Upon energization of the coil 272, the inner tube 260 may move toward the pole piece 256, thereby moving the valve member 262 away from the seat member 266. Thus, in the open position, the plug portion of the valve member 262 is displaced from the valve seat. In the open position, reagent is allowed to flow through the seat bore of the seat member 266.

The nozzle portion 268 may be positioned adjacent to the seat member 266. The nozzle portion 268 may atomize the reagent flowing therethrough. Thus, nozzle portion 268 may produce a spray of reagent. An end member 270 may support the nozzle portion 268 within the outer tube 258. The end member 270 further defines an aperture to allow the atomized reagent to flow therethrough. When the injector 110 dispenses the reagent into the exhaust flow of the engine 102 (shown in fig. 1), the reagent may exit through the outlet opening 228 of the first body 202.

During operation of the injector 110, reagent is received at the reagent inlet 241. Fig. 6 shows an exemplary reagent flow path 'R'. Reagent flows through inlet filter 242 and passage 286 of reagent tube 240. The reagent further flows into the bore 284 of the pole piece 256 and the orifice 288 of the inner tube 260. Reagent may exit the inner tube 260 through the tube aperture 290 into the tube chamber 294. The plug portion of the valve member 262 may prevent reagent from exiting the tube chamber 294 when the valve member 262 is in the closed position. A return spring 264 urges the valve member 262 to the closed position. Upon energization of the coil 272, the inner tube 260 may be advanced against the pole piece 256. The inner tube 260 may move the valve member 262 away from the seat member 266 against the bias of the return spring 264. Thus, the plug portion of the valve member 262 may be displaced from the valve seat of the seat member 266. With the valve member 262 in the open position, reagent may flow through the seat orifice of the seat member 266 into the nozzle portion 268. The reagent may be atomized by the nozzle portion 268. The atomized reagent may then exit the injector 110 in the form of a spray through the bore of the end member 270 and the outlet opening 228 of the first body 202. The reagent spray may enter the exhaust stream of the engine 102 and enable Selective Catalytic Reduction (SCR) of NOx emissions in the exhaust stream as it passes through the SCR component 114. When it is not desired to inject reagent into the exhaust stream, coil 272 may be de-energized. In the absence of any opposing electromagnetic force, the return spring 264 may move the valve member 262 to the closed position.

The ejector 110 may be cooled by fluid received at a fluid inlet 236 (as indicated by fluid flow path 'F' of fig. 5) of the fluid inlet tube 212. Additionally, fluid in the fluid chamber 232 may exit the injector 110 through the fluid outlet tube 214. The fluid in the fluid chamber 232 may cool the conduit portion 226 of the first body 202. The volume of fluid in the fluid chamber 232 may be optimized to provide efficient cooling. Accordingly, one or more components of the valve assembly 216 that are at least partially received within the conduit portion 226 may be cooled. The reagent located in the tube chamber 294 may also be cooled. This may significantly prevent the agent from solidifying due to the high temperature of the exhaust system 100.

When the second body 204 is in the normal position, as shown in fig. 6, the spring member 206 is preloaded to bias the second body 204 toward the first body 202. This may correspond to the thawing conditions of the reagents. In the normal position, the flange section 243 of the second body 204 may further be arranged on the end of the pole piece 256. The agent may swell in ice conditions. In the illustrated embodiment, the injector 110 may be substantially rigid in the radial direction. Thus, the reagent may expand along the axial direction 'D'. In addition, the frozen reagent may exert a pressure 'P' on the second body 204 due to the expansion, causing the second body 204 to be displaced away from the first body 202 along the axial direction 'D'. The pressure 'P' may be applied by expanding ice formed under the icing conditions of the agent. The spring member 206 also deforms to allow the second body 204 to move along the axial direction 'D'. In particular, the middle portion 250 of the spring member 206 may deform to allow the second body 204 to move relative to the first body 202. However, the biasing force 'Fb' exerted by the spring member 206 may limit the movement of the second body 204 and retain the second body 204 at a distance 'D1' (shown in fig. 7) from the pole piece 256. This may correspond to an extended position or configuration of the second body 204. Thus, the biasing force 'Fb' exerted by the spring member 206 due to the pre-loading may counteract the pressure 'P' exerted by the reagent in icing conditions. The expansion chamber 291 formed as a result of the movement of the second body 204 may also provide space for the reagent to expand during freezing. The seal member 287 may prevent any leakage of reagent from the injector 110. The reagent may be reduced after subsequent thawing of the reagent. The pressure 'P' may no longer be applied to the second body 204. After the ice melts, the spring member 206 may bias the second body 204 toward the first body 202. Specifically, the spring member 206 may displace the second body 204 and retain the second body 204 against the end of the pole piece 256.

Accordingly, the injector 110 may include a freeze protection feature including the spring member 206 to allow safe expansion of the reagent during freezing. Accordingly, any damage to the injector 110 due to the frozen reagent may be significantly prevented. Any leakage of reagent may also be prevented by the sealing member 287. After the reagent has melted, the spring member 206 further moves the second body 204 to its normal position.

Fig. 8-11 illustrate an injector 400 according to another aspect of the present disclosure. An injector 400 may be provided to inject a reagent into the exhaust stream of the engine 102 (shown in FIG. 1). Injector 400 includes a first injector body 402 (hereinafter "first body 402"), a second injector body 404 (hereinafter "second body 404"), a spring member 406, a reagent outlet tube 408, an electrical connector housing 410 (hereinafter "connector housing 410"), and a valve assembly 412. The injector 400 may define a longitudinal axis "L1" extending along a length of the injector 400.

The first body 402 may be substantially hollow and at least partially enclose the valve assembly 412. The first body 402 includes an upper portion 414 and a lower portion 416. The top end of the upper section 414 may be open. The top cover 418 may at least partially cover the top end of the upper portion 414. The upper portion 414 may have a substantially cylindrical shape. Additionally, the lower portion 416 may have a tapered shape. The first body 402 further includes a mounting flange 422. In the illustrated embodiment, the mounting flange 422 is integral with the first body 402. The mounting flange 422 defines a plurality of flange apertures 424. The flange apertures 424 enable the mounting flange 422 to be mounted on the row duct 106 (shown in FIG. 1) via mechanical fasteners, such as bolts.

The lower portion 416 defines an outlet opening 428 for discharging reagent into the exhaust stream. The upper portion 414 of the first body 402 includes a connector opening 429 for receiving the connector housing 410 therethrough. The first body 402 further comprises a receiving portion 434 for at least partially receiving the reagent outlet tube 408. Receiving portion 434 may be inclined with respect to a longitudinal axis "L1" of injector 400. Thus, the reagent outlet tube 408 may also be inclined relative to the longitudinal axis 'L1'. The reagent outlet tube 408 may be connected to the first body 402 via a number of different methods (e.g., welding, brazing, adhesives, mechanical fasteners, interference fit, etc.). In an embodiment, the reagent outlet tube 408 may be removably connected to the first body 402. The reagent outlet tube 408 further includes a flange section 910 disposed thereon. The flange section 910 includes an upper surface 911.

The reagent outlet tube 408 may be a hollow tube that allows reagent to flow therethrough. The reagent outlet tube 408 defines a reagent outlet 436 that is arranged in fluid communication with the reagent chamber 438 of the first body 402. Additionally, the reagent outlet 436 is spaced apart from the exhaust conduit 106 (shown in FIG. 1) with a reagent chamber 438 therebetween. In the illustrated embodiment, the reagent outlet 436 can be an opening that controls the exit of reagent from the reagent outlet tube 408. The reagent chamber 438 may be defined by the lower portion 416. The flow passage 437 (shown in fig. 9) of the reagent outlet tube 408 may be in fluid communication with the angled bore 439 of the first body 402. The angled bore 439 may be in fluid communication with the reagent chamber 438. Additionally, reagent outlet 436 may discharge fluid to a return line (not shown) connected to reagent tank 120 (shown in fig. 1). The reagent in the reagent chamber 438 may at least partially surround and provide cooling to one or more components of the valve assembly 412. Additionally, the volume of reagent in the reagent chamber 438 can be optimized to provide effective cooling of one or more components of the valve assembly 412.

The second body 404 includes a reagent tube 440. Reagent tube 440 may be oriented substantially parallel to longitudinal axis 'L1'. Additionally, reagent tube 440 may be substantially hollow, with open ends. Reagent line 440 may receive reagent from pump 122 (shown in fig. 1) via supply line 124. The reagent tube 440 further receives reagent at a reagent inlet 441. The reagent tube 440 includes an inlet filter 442 through which the reagent passes. The second body 404 further includes a flange section 443 extending from the reagent tube 440. The flange section 443 includes an upper surface 444. The reagent inlet and outlet configurations shown in fig. 8-11 are exemplary in nature, and alternative configurations are possible within the scope of the present disclosure. For example, reagent tube 440 may include a reagent outlet, while tube 408 may include a reagent inlet.

In an embodiment, the second body 404 may be movable relative to the first body 402. In addition, the second body 404 may be movable along an axial direction 'Da' that is substantially parallel to the longitudinal axis 'L1' of the injector 400. The spring member 406 is positioned between the first body 402 and the second body 404. Additionally, a spring member 406 may movably connect the second body 404 to the first body 402. In an embodiment, the spring member 406 may be a substantially flat spring. Additionally, the spring member 406 may be formed by at least one stamping or molding process. In further embodiments, the spring member 406 may be made of a metal or metal alloy. The spring member 406 includes a main portion 446, at least one elongated portion 448, and at least one intermediate portion 450 disposed between the main portion 446 and the at least one elongated portion 448. In the illustrated embodiment, the spring member 406 includes a pair of elongated portions 448 and a pair of intermediate portions 450. In alternative embodiments, each of the pair of elongated portions 448 may have a zigzag shape to provide additional travel of the second body 404. Each of the pair of intermediate portions 450 is disposed between the main portion 446 and the corresponding elongate portion 448. The main portion 446 is disposed on the flange section 443 of the reagent tube 440. In addition, the main portion 446 presses against the upper surface 444 of the flange section 443. In another embodiment, the main portion 446 may be connected to a substantially circular region of the flange section 443 of the reagent tube 440. The main portion 446 may have an annular shape defining a main aperture 452. Although in the illustrated embodiment, the primary orifice 452 has a substantially circular shape, other shapes of the primary orifice 452 are contemplated within the scope of the present disclosure. Such shapes of the main aperture 452 may include polygonal, elliptical, and the like. The main orifice 452 is arranged to at least partially surround the reagent tube 440. Thus, the main aperture 452 allows the reagent tube 440 to extend therethrough. In an embodiment, the main portion 446 may be press fit over the flange section 443 of the second body 404. In other embodiments, the main portion 446 may be attached to the second body 404 by a number of different methods (e.g., welding, brazing, adhesives, mechanical fasteners, etc.). In another embodiment, the main portion 446 may be detachably connected to the second body 404.

The intermediate portion 450 may extend from diametrically opposite sides of the main portion 446. In an undeformed or normal state, the intermediate portions 450 have a curvilinear shape that extends upwardly from the main portions 446 and then curves downwardly toward the respective elongate portions 448. Specifically, each intermediate portion 450 includes a first section 450a extending upwardly from the main portion 446 and a second section 450b that curves downwardly and meets with the respective elongate portion 448. In an embodiment, the first section 450a may have a substantially planar shape. In the undeformed state or configuration, the first section 450a is further inclined at an angle 'Ah' (shown in fig. 10) relative to the main portion 446. The second section 450b has a curved shape and connects the first section 450a to the respective elongated portion 448. Each intermediate portion 450 is adapted to deform to allow the second body 404 to move relative to the first body 402. In particular, each intermediate portion 450 deforms to allow the second body 404 to move away from the first body 402 along the axial direction 'Da'. As shown in fig. 11, in the deformed state or configuration, the first section 450a is oriented substantially parallel to the main portion 446, i.e., the angle therebetween is substantially zero. After each intermediate portion 450 deforms or flexes to a point where the first section 450a is oriented substantially parallel to the main portion 446, the spring member 406 may limit the maximum axial movement of the second body 404 relative to the first body 402. Distance 'D2' (shown in fig. 11) may correspond to a maximum axial movement of second body 404 relative to first body 402. The distance 'D2' may be the distance between the second body 404 and the pole piece 456.

Each elongate portion 448 includes a substantially planar shape. In an embodiment, each elongated portion 448 is connected to the first body 402 by welding. In other embodiments, each elongate portion 448 can be connected to the first body 402 by a number of different methods (e.g., brazing, mechanical fasteners, adhesives, etc.). In another embodiment, each elongate portion 448 may be removably connected to the first body 402 by a non-permanent joining method. Such a detachable connection may enable second body 404 to be removed from first body 402, thereby allowing for repair and/or replacement of one or more internal components of injector 400 (e.g., valve assembly 412). In further embodiments, each elongate portion 448 may be connected to the first body 402 by a snap-fit connection.

In an embodiment, the spring member 406 is preloaded to bias the second body 404 toward the first body 402. In another embodiment, the spring member 406 is further configured to bias or urge the valve assembly 412 toward the first body 402. The second body 404 may be biased to move against a spring member 406 in response to expansion of the reagent during freezing. The spring member 406 is further configured to limit maximum movement of the second body 404 relative to the first body 402 in response to expansion of the reagent during freezing. In particular, the spring member 406 may apply a biasing force 'Fs' to resist the pressure 'Pa' applied by the reagent during freezing. The agent may swell under ice conditions due to the formation of ice. Thus, the expansion of the reagent is due to the expansion of the ice. The pressure 'Pa' is applied by the ice formed as the reagent is frozen. In an embodiment, the limit of movement of the second body 404 may be an end stop.

The valve assembly 412 (shown in fig. 9-11) includes an electromagnet 454, a pole piece 456, an outer tube 458, an inner tube 460, a valve member 462, a return spring 464, a seat member 466, a nozzle portion 468, and an end member 470. In an embodiment, the valve assembly 412 may be a removable or replaceable cartridge assembly. Accordingly, valve assembly 412 may be removed from injector 400 and replaced with another valve assembly, if desired. The valve assembly 412 is configured for selectively dispensing reagent through the outlet opening 428 of the first body 402. The electromagnet 454 includes a coil 472, a bobbin 474, a tube 476, and an end cap 478. The electromagnet 454 may be disposed within the first body 402. The structure and function of the various components of the valve assembly 412 and the electromagnet 454 are primarily similar to the structure and function of the valve assembly 216 and electromagnet 254, respectively, described above with reference to fig. 2-7. Accordingly, some details of the valve assembly 412 and the electromagnet 454 will be omitted from this disclosure.

Retention ring 480 may retain and/or support connector housing 410 within first housing 402. A sealing element 482 (e.g., an O-ring) is also mounted between the tube 476 and the first body 402. The sealing element 482 may prevent any leakage of reagent. The pole piece 456 defines an aperture 484 extending therethrough. The aperture 484 is in fluid communication with the passage 486 of the reagent tube 440. Additionally, the reagent tube 440 is at least partially received within the aperture 484 of the pole piece 456.

A sealing member 487 is disposed between the second body 404 and the valve assembly 412. Specifically, sealing member 487 is disposed between reagent tube 440 and pole piece 456. In an alternative embodiment, the sealing member 487 may be disposed between the first body 402 and the second body 404. The sealing member 487 may be an O-ring. Additionally, sealing member 487 is received in groove 489 of reagent tube 440. Sealing member 487 may prevent leakage of reagent from injector 400.

In response to expansion of the reagent during freezing, the second body 404 including the reagent tube 440 may be displaced from the first body 402. The spring member 406 may limit axial movement of the second body 404. In the displaced state, as shown in fig. 11, the reagent tube 440 and the pole piece 456 may define an expansion chamber 491 therebetween. The expansion chamber 491 may allow the reagent to expand during freezing. Thus, the expansion chamber 491 may serve as a reservoir for the frozen reagent. In particular, the expansion chamber 491 may serve as a reservoir for ice formed as a result of freezing of the reagent. Since the ice is allowed to expand, damage to various components of the ejector 400 may be prevented. In addition, the sealing member 487 may prevent any leakage of reagent from the expansion chamber 491. The volume of the expansion chamber 491 may be optimized to allow for proper expansion of the ice formed under the freezing conditions of the reagent.

The inner tube 460 defines a tube bore 488 in fluid communication with the bore 484 of the pole piece 456. In an embodiment, inner tube 460, pole piece 456, and reagent tube 440 may be coaxially aligned with one another. A return spring 464 is received between the pole piece 456 and a corresponding shoulder of the inner tube 460. Additionally, the inner tube 460 is enclosed within the outer tube 458. The outer tube 458 is at least partially received within the electromagnet 454 and the lower portion 416 of the first body 402. The inner tube 460 further defines a plurality of tube bores 492. The tube bore 492 may allow fluid communication between the tube bore 488 and the lumen chamber 494. The tube chamber 494 may be at least partially defined by the bore of the outer tube 458. Outer tube 458 further includes an aperture 496 that fluidly communicates a lumen chamber 494 of outer tube 458 with reagent chamber 438 of first body 402. The reagent in reagent chamber 438 may cool one or more components of valve assembly 412.

One end of the valve member 462 is connected to the inner tube 460. The return spring 464 normally urges the inner tube 460 and the valve member 462 against the valve seat of the seat member 466. In the closed position, the plug portion of the valve member 462 rests on the valve seat and closes the seat bore of the seat member 466. Upon energization of coil 472, inner tube 460 may move toward pole piece 456, thereby moving valve member 462 away from seat member 466. Thus, in the open position, the plug portion of the valve member 462 is displaced from the valve seat. In the open position, reagent is allowed to flow through the seat bore of the seat member 466.

Nozzle portion 468 can be positioned adjacent to seat member 466. Nozzle portion 468 can atomize a reagent flowing therethrough. End member 470 may support nozzle portion 468 within outer tube 458. End member 470 further defines an aperture to allow the atomized reagent to flow therethrough. When injector 400 dispenses reagent into the exhaust flow of engine 102 (shown in fig. 1), the reagent may exit through outlet opening 428 of first body 402.

During operation of injector 400, reagent is received at reagent inlet 441. Fig. 9 shows an exemplary reagent flow path 'R1'. Reagent flows through the inlet filter 442 and the passage 486 of the reagent tube 440. The reagent further flows into the apertures 484 of the pole piece 456 and the tube apertures 488 of the inner tube 460. The reagent may exit the inner tube 460 through the tube aperture 490 into the tube chamber 494. The plug portion of the valve member 462 may prevent reagent from exiting the tube chamber 494 when the valve member 462 is in the closed position. A return spring 464 urges the valve member 462 to the closed position. Upon energization of the coil 472, the inner tube 460 may be advanced against the pole piece 456. The inner tube 460 may move the valve member 462 away from the seat member 466 against the bias of the return spring 464. Thus, the plug portion of the valve member 462 may be displaced from the valve seat of the seat member 466. With valve member 462 in the open position, reagent may flow through the seat orifice of seat member 466 into nozzle portion 468. The reagent may be atomized by nozzle portion 468. The atomized reagent may then exit the injector 400 in the form of a spray through the bore of the end member 470 and the outlet opening 428 of the first body 402. The reagent spray may enter the exhaust stream of the engine 102 and enable Selective Catalytic Reduction (SCR) of NOx emissions in the exhaust stream as it passes through the SCR component 114. When it is not desired to inject reagent into the exhaust stream, coil 472 may be de-energized. In the absence of any opposing electromagnetic force, the return spring 464 may move the valve member 462 to the closed position.

As indicated by reagent flow path 'R1', reagent in lumen chamber 494 can flow through apertures 496 into reagent chamber 438. The reagent in reagent chamber 438 may cool one or more components of valve assembly 412. The shape and/or size of the bore 496 may be selected based on the cooling requirements of the valve assembly 412. The volume of reagent in the reagent chamber 438 may also be optimized to provide effective cooling.

When the second body 404 is in the normal position, as shown in fig. 10, the spring member 406 is preloaded to bias the second body 404 toward the first body 402. This may correspond to the thawing conditions of the reagents. In the normal position, the flange section 443 of the second body 404 may further be arranged on the end of the pole shoe 456. The agent may swell in ice conditions. In the illustrated embodiment, the injector 400 may be substantially rigid in the radial direction. Thus, the reagent may expand along the axial direction 'Da'. In addition, the frozen reagent may exert a pressure 'Pa' on the second body 404 due to the expansion, causing the second body 404 to be displaced away from the first body 402 along the axial direction 'Da'. The pressure 'Pa' may be applied by expanding ice formed under the icing conditions of the agent. The spring member 406 also deforms to allow the second body 404 to move in the axial direction 'Da'. In particular, the middle portion 450 of the spring member 406 may deform to allow the second body 404 to move relative to the first body 402. However, the biasing force 'Fs' exerted by the spring member 406 may limit the movement of the second body 404 and retain the second body 404 at a distance 'D2' (shown in fig. 11) from the pole piece 456. This may correspond to an extended position or configuration of the second body 404. Thus, the biasing force 'Fs' exerted by the spring member 406 due to the pre-loading may counteract the pressure 'Pa' exerted by the reagent under icing conditions. The expansion chamber 491 formed as a result of the movement of the second body 404 may also provide space for the reagent to expand during freezing. The sealing member 487 may prevent any leakage of reagent from the injector 400. The reagent may be reduced after subsequent thawing of the reagent. The pressure 'Pa' may no longer be applied to the second body 404. After the ice melts, the spring member 406 may bias the second body 404 toward the first body 402. Specifically, the spring member 406 may displace the second body 404 and retain the second body 404 against the end of the pole piece 456.

Accordingly, the injector 400 may include a freeze protection feature including a spring member 406 to allow safe expansion of the reagent during freezing. Accordingly, any damage to the injector 400 due to the frozen reagent may be significantly prevented. Any leakage of reagent may also be prevented by the sealing member 487. After the reagent has melted, the spring member 406 further moves the second body 404 to its normal position.

The injector 400 shown in fig. 8-11 is merely exemplary in nature, and alternative configurations are possible within the scope of the present disclosure. For example, instead of the second body 404, the reagent outlet tube 408 may be movable relative to the first body 402. Additionally, a spring member (not shown) may bias the reagent outlet tube 408 toward the first body 402. The spring member may also restrict movement of the reagent outlet tube 408 in response to expansion of the reagent during freezing. When the reagent melts, the spring member may further move the reagent outlet tube 408 to the normal position. As such, the present disclosure is not limited to the injector 400 moving in the axial direction 'Da' to allow the reagent to expand under icing conditions. Instead, the movement may be oriented at any angle relative to the longitudinal axis 'L1'.

In another embodiment, both the second body 404 and the reagent outlet tube 408 may be movable relative to the first body 402. Thus, the injector 400 may include two spring members. One spring member may be used for the second body 404 and another spring member may be used for the reagent outlet tube 408.

Fig. 12 and 13 illustrate cross-sectional views of an injector 600 according to another aspect of the present disclosure. The injector 600 is substantially similar in structure and function to the injector 110 described above with reference to fig. 2-7. Accordingly, like parts are provided with like reference numerals. However, the spring member 602 of the injector 600 may also serve as a top cover for the first body 202. Specifically, the spring member 602 may retain various parts of the valve assembly 216 within the first body 202. The spring member 602 is positioned between the first body 202 and the second body 204. The spring member 602 may also connect the second body 204 to the first body 202. In an embodiment, the spring member 602 may be a generally flat spring. Additionally, the spring member 602 may be formed by at least one stamping or molding process. In further embodiments, the spring member 602 may be made of a metal or metal alloy. The spring member 602 includes at least one main portion 604, at least one intermediate portion 606, at least one elongated portion 608, and at least one cover portion 610. In an embodiment, the spring member 602 may have a substantially axisymmetric configuration. In particular, the spring member 602 may be substantially symmetrical about the longitudinal axis 'L' of the injector 600. In an alternative embodiment, the spring member 602 may have a pair of intermediate portions 606 extending from the main portion 604, and a pair of elongated portions 608 extending from the respective intermediate portions 606. In another embodiment, spring member 602 may have a plurality of intermediate portions 606, wherein each intermediate portion 606 extends from a separate main portion (not shown). Additionally, each elongate portion 608 may extend from a corresponding intermediate portion 606. Thus, intermediate portion 606 and elongate portion 608 are not connected to each other. Intermediate portion 606 and elongated portion 608 may flex or deform away from each other, thereby allowing for repair and/or replacement of one or more internal components of injector 600 (e.g., valve assembly 216).

The main portion 604 is arranged on a flange section 243 of the reagent tube 240. In addition, the main portion 604 presses against the upper surface 244 of the flange section 243. The upper surface 244 may include a lip-shaped profile such that the main portion 604 snaps or clips onto the second body 204. This may also prevent the second body 204 from rotating. In another embodiment, the main portion 604 may be connected to a substantially circular region of the flange section 243 of the reagent tube 240. The main portion 604 may have an annular shape defining a main aperture 612. The main orifice 612 is arranged to at least partially surround the reagent tube 240. In alternative embodiments, the main portion 604 may not include a completely closed orifice. For example, the main aperture 612 may be substantially U-shaped. Thus, the main aperture 612 allows the reagent tube 240 to extend therethrough. In an embodiment, the main portion 604 may be press fit over the flange section 243 of the second body 204. In other embodiments, the main portion 604 may be attached to the second body 204 by a number of different methods (e.g., welding, brazing, adhesives, mechanical fasteners, etc.). In another embodiment, the main portion 604 may be detachably connected to the second body 204.

The intermediate portion 606 may extend from the main portion 604. In another embodiment, the main portion 604 may be an end or extension of the intermediate portion 606 that contacts the second body 204. In the undeformed or normal state as shown in fig. 12, the intermediate portion 606 has a curvilinear shape that extends upward from the main portion 604 and then curves downward toward the elongated portion 608. In a deformed state or configuration as shown in fig. 13, a portion of the intermediate portion 606 is oriented substantially parallel to the main portion 604. After the intermediate portion 606 is deformed or flexed to a point where the portion of the intermediate portion 606 is oriented substantially parallel to the main portion 604, the spring member 602 may limit the maximum axial movement of the second body 204 relative to the first body 202. Distance 'D3' (shown in fig. 13) may correspond to a maximum axial movement of second body 204 relative to first body 202. The distance 'D3' may be the distance between the second body 204 and the pole piece 256.

An elongated portion 608 extends from the intermediate portion 606. Accordingly, intermediate portion 606 may be disposed between main portion 604 and elongate portion 608. Additionally, the elongated portion 608 may be connected to the pole piece 256. In an embodiment, the elongated portion 608 is connected to the pole piece 256 by welding. In other embodiments, the elongated portion 608 is connected to the pole piece 256 by a number of different methods (such as brazing, mechanical fasteners, adhesives, etc.). In another embodiment, the elongate portion 608 may be removably connected to the pole piece 256 by a non-permanent joining method. Such a detachable connection may enable second body 204 to be removed from first body 202, thereby allowing for repair and/or replacement of one or more internal components of injector 600 (e.g., valve assembly 216). In further embodiments, the elongate portion 608 may be connected to the pole piece 256 by a snap-fit connection.

Cover portion 610 extends from elongate portion 608 and is oriented substantially orthogonal to longitudinal axis 'L' of injector 600. Accordingly, the elongated portion 608 may be disposed between the middle portion 606 and the cover portion 610. The cover portion 610 at least partially covers the top end of the first body 202. In an embodiment, the cover portion 610 is connected to the first body 202 by welding. In other embodiments, the cover portion 610 may be attached to the first body 202 by a number of different methods (e.g., brazing, mechanical fasteners, adhesives, etc.). In another embodiment, the cover portion 610 may be removably attached to the first body 202 by a non-permanent attachment method. Such a detachable connection may enable second body 204 to be removed from first body 202, thereby allowing for repair and/or replacement of one or more internal components of injector 600 (e.g., valve assembly 216). In further embodiments, the cover portion 610 may be connected to the first body 202 by a snap-fit connection.

In an embodiment, the spring member 602 is preloaded to bias the second body 204 toward the first body 202. In another embodiment, the spring member 602 is further configured to bias or urge the valve assembly 216 toward the first body 202. The second body 204 may be biased to move against the spring member 602 in response to expansion of the reagent during freezing. The spring member 602 is further configured to limit maximum movement of the second body 204 relative to the first body 202 in response to expansion of the reagent during freezing. In particular, the spring member 602 may apply a biasing force 'F1' to resist the pressure 'P' exerted by the reagent during freezing. The agent may swell under ice conditions due to the formation of ice. Thus, the expansion of the agent is caused by the expansion of the ice. The pressure 'P' is exerted by the ice formed as the reagent is frozen. The spring member 602 may further be configured to at least partially cover a top end of the first body 202.

In response to expansion of the reagent during freezing, the second body 204 including the reagent tube 240 may be axially displaced from the first body 202. The spring member 602 may limit the maximum axial movement of the second body 204. In the displaced state, as shown in fig. 13, the reagent tube 240 and pole piece 256 may define an expansion chamber 614 therebetween. The expansion chamber 614 may allow the reagent to expand during freezing. Thus, the expansion chamber 614 may serve as a reservoir for the frozen reagent. In particular, the expansion chamber 614 may serve as a reservoir for ice formed as a result of freezing of the reagent. Since the ice is allowed to expand, damage to various components of the ejector 600 may be prevented. Additionally, the sealing member 287 may prevent any leakage of reagent from the expansion chamber 614. The volume of the expansion chamber 614 may be optimized to allow for proper expansion of the ice formed under the icing conditions of the reagent.

When the second body 204 is in the normal position, as shown in fig. 12, the spring member 602 is preloaded to bias the second body 204 toward the first body 202. This may correspond to the thawing conditions of the reagents. In the normal position, the flange section 243 of the second body 204 may further be arranged on the end of the pole piece 256. The agent may swell in ice conditions. In the illustrated embodiment, the ejector 600 may be substantially rigid in the radial direction. Thus, the reagent may expand along the axial direction 'D'. In addition, the frozen reagent may exert a pressure 'P' on the second body 204 due to the expansion, causing the second body 204 to be displaced away from the first body 202 along the axial direction 'D'. The pressure 'P' may be applied by expanding ice formed under the icing conditions of the agent. The spring member 602 also deforms to allow the second body 204 to move along the axial direction 'D'. Specifically, the middle portion 606 of the spring member 602 may deform to allow the second body 204 to move relative to the first body 202. However, the biasing force 'F1' exerted by spring member 602 may limit the maximum movement of second body 204 and retain second body 204 at a distance 'D3' (shown in fig. 13) from pole piece 256. This may correspond to an extended position or configuration of the second body 204. Thus, the biasing force 'F1' exerted by the spring member 602 due to the preload may counteract the pressure 'P' exerted by the reagent under icing conditions. The expansion chamber 614 formed by the movement of the second body 204 may also provide space for the reagent to expand during freezing. The sealing member 287 may prevent any leakage of reagent from the injector 600. The reagent may be reduced after subsequent thawing of the reagent. The pressure 'P' may no longer be applied to the second body 204. After the ice melts, the spring member 602 may bias the second body 204 toward the first body 202. Specifically, the spring member 602 may displace the second body 204 and retain the second body 204 against the end of the pole piece 256.

Accordingly, the injector 600 may include a freeze protection feature including a spring member 602 to allow safe expansion of the reagent during freezing. Accordingly, any damage to the injector 600 due to the frozen reagent may be significantly prevented. Any leakage of reagent may also be prevented by the sealing member 287. After the reagent has melted, the spring member 602 further moves the second body 204 to its normal position. The spring member 602 may also serve as a top cover for the first body 202.

FIG. 14 illustrates a perspective view of an injector 800 according to another aspect of the present disclosure. FIG. 15 illustrates a perspective view of a cover member 801 of an injector 800 according to an embodiment of the present disclosure. Fig. 16 and 17 illustrate cross-sectional views of the injector 800. The injector 800 is substantially similar in structure and function to the injector 110 described above with reference to fig. 2-7. Accordingly, like parts are provided with like reference numerals. However, the spring member 802 of the injector 800 may also serve as a cap for the first body 202. In addition, the injector 800 includes a cover member 801 coupled to the first body 202. Cover member 801 includes integral flange portion 803 for mounting injector 800 on a component. Further, the first body 202 defines a first end 805 and a second end 807 opposite the first end 805. Both the first end 805 and the second end 807 may be open. Additionally, the first and second ends 805, 807 may be spaced apart from one another relative to the longitudinal axis 'L' of the injector 800. Specifically, the first and second ends 805, 807 may be axial ends of the injector 800. The first end 805 may be a top end and is proximate to the second body 204. Second end 807 may be the bottom end and adjacent to cover member 801. First end 805 may also allow valve assembly 216 to be inserted into and/or removed from injector 800. The recessed portion 230 is disposed at the second end 807. Conduit portion 226 of injector 800 may also be disposed at second end 807 and extend from recessed portion 230. The outlet opening 228 is arranged near the second end 807 of the first body 202. In addition, an outlet opening 228 is defined by the conduit portion 226. Cover member 801 is adapted to at least partially cover second end 807 of injector 800.

The spring member 802 is positioned between the first body 202 and the second body 204. The spring member 802 is adapted to allow the second body 204 to move relative to the first body 202 in response to expansion of the reagent during freezing. The spring member 802 may at least partially cover the first end 805 of the injector 800. Additionally, the spring member 802 may retain various parts of the valve assembly 216 within the first body 202. The spring member 802 is positioned between the first body 202 and the second body 204. The spring member 802 may also connect the second body 204 to the first body 202. Thus, the second body 204 is movably coupled to the first body 202. In the illustrated embodiment, as shown in fig. 16, the spring member 802 includes a first spring portion 802A and a second spring portion 802B. The first and second spring portions 802A, 802B may be separate components and connected to the first and second bodies 202, 204 independently of one another. In an embodiment, the first and second spring portions 802A, 802B are detachably coupled to the first and second bodies 202, 204, respectively. The first and second spring portions 802A, 802B may be snap-fit onto the first and second bodies 202, 204. Specifically, the first and second spring portions 802A and 802B may each be a deformable clip that may be attached to the first and second bodies 202 and 204 by respective snap-fit connections. In addition, each of first and second spring portions 802A and 802B may be easily removed from injector 800 by deforming each of first and second spring portions 802A and 802B away from longitudinal axis 'L' of injector 800. This may facilitate repair and/or replacement of one or more components (e.g., valve assembly 216). In an embodiment, the first and second spring portions 802A, 802B of the spring member 802 may each be a generally flat spring. Additionally, each of the first and second spring portions 802A, 802B may be formed by at least one stamping or molding process. In further embodiments, the first spring portion 802A and the second spring portion 802B may each be made of a metal or metal alloy. First spring 802A and second spring 802B each include a main portion 804, an intermediate portion 806, a first elongated portion 808, a second intermediate portion 810, and a second elongated portion 812.

A main portion 804 of each of the first spring portion 802A and the second spring portion 802B is disposed on the flange section 243 of the reagent tube 240. In addition, the main portion 804 presses against the upper surface 244 of the flange section 243. The upper surface 244 may include a lip-like profile such that the main portion 804 snaps or clips onto the second body 204. This may also prevent the second body 204 from rotating. In another embodiment, the main portion 804 may be connected to a substantially circular region of the flange section 243 of the reagent tube 240. The main portion 804 may be a circular segment. The main portions 804 of the first and second spring portions 802A, 802B together define a main orifice 814. The main orifice 814 is arranged to at least partially surround the reagent tube 240. In an embodiment, the main portion 804 may not include a completely closed orifice. For example, the main aperture 814 may be substantially U-shaped. Thus, the main aperture 814 allows the reagent tube 240 to extend therethrough. In an embodiment, the main portion 804 may include a bent end (not shown) for securing the corresponding first and second spring portions 802A, 802B to the second body 204. Additionally, first and second spring portions 802A, 802 may be removed from second body 204 by bending corresponding main portions 804 away from longitudinal axis 'L' of injector 800.

First intermediate portions 806 of first and second spring portions 802A and 802B, respectively, may extend from main portion 804. In another embodiment, primary portion 804 may be an end or extension of first intermediate portion 806 that contacts second body 204. In the undeformed or normal state as shown in fig. 16, the first intermediate portion 806 has a curvilinear shape that extends upward from the main portion 804 and then curves downward toward the first elongated portion 808. In a deformed state or configuration as shown in fig. 17, a portion of first intermediate portion 806 is oriented substantially parallel to main portion 804. After first intermediate portion 806 is deformed or flexed to a point where the portion of first intermediate portion 806 is oriented substantially parallel to main portion 804, spring member 802 may limit the maximum axial movement of second body 204 relative to first body 202. Distance 'D4' (shown in fig. 17) may correspond to a maximum axial movement of second body 204 relative to first body 202. The distance 'D4' may be the distance between the second body 204 and the pole piece 256.

A first elongated portion 808 of each of the first and second spring portions 802A, 802B extends from the first intermediate portion 806. Accordingly, first intermediate portion 806 may be disposed between main portion 804 and first elongated portion 808. Additionally, the first elongated portion 808 may be removably connected to the pole piece 256. Such a detachable connection may enable second body 204 to be removed from first body 202, thereby allowing for repair and/or replacement of one or more internal components of injector 800 (e.g., valve assembly 216). In further embodiments, the first elongate portion 808 may be connected to the pole piece 256 by a snap-fit connection. Further, first elongate portion 808 may flex or deform away from pole piece 256 to allow for servicing of one or more components of injector 800.

A second intermediate portion 810 of each of the first and second spring portions 802A, 802B extends from the first elongate portion 808. Thus, first intermediate portion 806 may be disposed at an end of first elongated portion 808, while second intermediate portion 810 may be disposed at an opposite end of first elongated portion 808. In particular, first elongate portion 808 may be disposed between first intermediate portion 806 and second intermediate portion 810. The second intermediate portions 810 of the first and second spring portions 802A and 802B may together serve as a top cover for the first body 202. Specifically, the second intermediate portion 810 at least partially covers the first end 805 of the first body 202. Thus, the second intermediate portion 810 may be a cover portion of each of the first and second spring portions 802A and 802B. Second intermediate portion 810 may have a curvilinear shape that extends downward from first elongated portion 808 and is then oriented substantially orthogonal to longitudinal axis 'L' of injector 800. The second intermediate portion 810 may be further bent to meet the second elongated portion 812. The first end 805 of the first body 202 may be rounded or chamfered to conform to the curvilinear shape of the second intermediate portion 810 of the first and second spring portions 802A, 802B. The second intermediate portion 810 may be detachably connected to the first body 202. Such a detachable connection may enable second body 204 to be removed from first body 202, thereby allowing for repair and/or replacement of one or more internal components of injector 800 (e.g., valve assembly 216). In further embodiments, the second intermediate portion 810 may be connected to the first body 202 by a snap-fit connection. Additionally, second intermediate portion 810 may flex or deform away from first body 202 to allow for servicing of one or more components of injector 800.

A second elongated portion 812 of each of the first and second spring portions 802A, 802B extends from the second intermediate portion 810. Additionally, the second elongated portion 812 may be removably connected to the first body 202. Such a detachable connection may enable second elongate portion 812 to be removed from first body 202, thereby allowing for repair and/or replacement of one or more internal components of injector 800 (e.g., valve assembly 216). In further embodiments, the second elongate portion 812 may be connected to the first body 202 by a snap-fit connection. Further, the second elongate portion 812 may flex or deform away from the first body 202 to allow for servicing of one or more components of the injector 800. In an embodiment, the second elongated portion 812 may include a curved end (not shown) that engages a lip (not shown) of the first body 202 to secure the corresponding first and second spring portions 802A, 802B to the first body 202.

The cover member 801 includes a cup portion 818 and a flange portion 803 integral with the cup portion 818. The flange portion 803 may extend outwardly from the cup portion 818. The cup portion 818 is adapted to at least partially cover the second end 807 of the first body 202. Cup portion 818 may have a substantially axisymmetric configuration. Specifically, the cup portion 818 may be substantially symmetrical about the longitudinal axis 'L' of the injector 800. In addition, the cup portion 818 of the cover member 801 defines a cover aperture 820 therethrough. The cover aperture 820 may be centrally located on the cup portion 818. The cover aperture 820 is adapted to at least partially receive the conduit portion 226 of the injector 800. Specifically, the cover aperture 820 may receive an end 822 of the conduit portion 226. The conduit portion 226 may further include a step adjacent to the end 822 such that the conduit portion 226 may be supported on the cup portion 818. In the illustrated embodiment, the cover aperture 820 is substantially circular. However, the cover aperture 820 may have any suitable shape to at least partially receive the conduit portion 226 therein. In an embodiment, cup portion 818 may be press fit onto conduit portion 226. Specifically, an inner diameter of the cup portion 818 defining the cover aperture 820 may be press fit onto a terminal end 822 of the conduit portion 226. A clearance fit may be provided between the cup portion 818 and the outer diameter of the second end 807 of the first body 202. In another embodiment, the cup portion 818 may be further welded to the conduit portion 226 at one or more welding locations or points. Specifically, the cup portion 818 may be welded to the conduit portion 226 at a first weld location 826. In other embodiments, the cup portion 818 may be attached to the first body 202 by a number of different methods (e.g., brazing, mechanical fasteners, adhesives, etc.). Cup portion 818 may serve as a bottom cap or port cover for sparger 800. Additionally, the first body 202 and the cup portion 818 may together define a fluid chamber 824. The fluid chamber 824 may at least partially surround the conduit portion 226. In particular, the cup portion 818, the recess portion 230, and the conduit portion 226 may define a fluid chamber 824. Fluid inlet tube 212 and fluid outlet tube 214 of injector 800 may be in fluid communication with fluid chamber 824. Specifically, fluid inlet tube 212 fluid inlet 236 (shown in fig. 3) is disposed in fluid communication with fluid chamber 824. Similarly, fluid outlet 238 (shown in fig. 3) of fluid outlet tube 214 is disposed in fluid communication with fluid chamber 824. The fluid inlet 236 may be arranged to receive a fluid different from the reagent. In an embodiment, the fluid may be a coolant (e.g., water). The fluid inlet 236 may receive fluid from the cooling system 130 (shown in fig. 1) via the fluid supply line 132. The fluid passage 239 (shown in fig. 5) of the fluid inlet tube 212 may be in fluid communication with the angled bore 245 (shown in fig. 5) of the first body 202. The angled bore 245 may be in fluid communication with the fluid chamber 824. Additionally, fluid in fluid chamber 824 may exit injector 800 through fluid outlet tube 214. The flow passage (not shown) of fluid outlet tube 214 may be in fluid communication with another angled bore (not shown) of first body 202. The angled bore may be in fluid communication with the fluid chamber 824. Fluid chamber 824 may serve as a cooling chamber for one or more components of injector 800. The cooling function of the fluid chamber 824 may be substantially similar to the cooling function of the fluid chamber 232 (shown in fig. 5) of the injector 110.

The flange portion 803 may be integral with the cup portion 818 of the cover member 801. Thus, cover member 801 may be incorporated into the port cover and mounting flange or bracket of injector 800 in a one-piece design. The cover member 801 may be manufactured by stamping or investment casting. In addition, the cover member 801 may be made of metal or metal alloy. The flange portion 803 may be a complex thin-walled mounting plate extending from the exterior of the cup portion 818. The flange portion 803 further defines at least one mounting aperture or hole 828. In the embodiment illustrated in fig. 15, the flange portion 803 includes three mounting holes 828. Each of the mounting holes 828 has a circular shape. However, each of these mounting holes 828 may have any alternative shape as desired. Mounting holes 828 may enable flange portion 803, and thus injector 800, to be mounted on a component via mechanical fasteners (e.g., bolts). The component may be an exhaust conduit 106 (shown in fig. 1) of the exhaust system 100. In an embodiment, the flange portion 803 may be welded to the first body 202 at one or more welding locations or points. Specifically, the flange portion 803 may be welded to the extension portion 823 of the first body 202 at the second welding location 830. In other embodiments, the flange portion 803 may be attached to the first body 202 by a number of different methods (e.g., brazing, mechanical fasteners, adhesives, etc.).

Because the cup portion 818 and the flange portion 803 are integral with one another, the cover member 801 can eliminate at least one weld, thereby reducing assembly cycle time and associated costs. The cover member 801 may also eliminate potential alignment issues (e.g., radial clearance) between the cup portion 818 and the first body 202 that may otherwise adversely affect the welding process. Cover member 801 may also provide additional thermal benefits by directly cooling integral flange portion 803. Cover member 801 may also reduce cost because the port cover and mounting flange are manufactured integrally, rather than as separate components. While cover member 801 is described with respect to injector 800, it is contemplated that cover member 801 may be incorporated into injectors 110, 400, 600 described above.

In an embodiment, each of the first and second spring portions 802A, 802B of the spring member 802 is preloaded to bias the second body 204 toward the first body 202. In another embodiment, the first and second spring portions 802A, 802B of the spring member 802 are further configured to bias or urge the valve assembly 216 toward the first body 202. The second body 204 may be biased to move against the first and second spring portions 802A, 802B in response to expansion of the reagent during freezing. The first and second spring portions 802A, 802B are further configured to limit maximum movement of the second body 204 relative to the first body 202 in response to expansion of the reagent during freezing. Specifically, the first and second spring portions 802A and 802B may apply a biasing force 'F2' to resist the pressure 'P' exerted by the reagent during freezing. The agent may swell under ice conditions due to the formation of ice. Thus, the expansion of the agent is caused by the expansion of the ice. The pressure 'P' is exerted by the ice formed as the reagent is frozen. The first and second spring portions 802A, 802B may further be configured to at least partially cover the first end 805 of the first body 202.

In response to expansion of the reagent during freezing, the second body 204 including the reagent tube 240 may be axially displaced from the first body 202. The first and second spring portions 802A, 802B may limit the maximum axial movement of the second body 204. In the displaced state, as shown in fig. 17, reagent tube 240 and pole piece 256 may define an expansion chamber 832 therebetween. Expansion chamber 832 may allow the reagent to expand during freezing. Thus, expansion chamber 832 may serve as a reservoir for frozen reagent. In particular, expansion chamber 832 may serve as a reservoir for ice formed as a result of freezing of the reagent. Since the ice is allowed to expand, damage to various components of the ejector 800 may be prevented. Additionally, the sealing member 287 may prevent any leakage of reagent from the expansion chamber 832. The volume of expansion chamber 832 may be optimized to allow for proper expansion of ice formed under icing conditions of the reagent.

When the second body 204 is in the normal position, as shown in fig. 16, the first and second spring portions 802A, 802B are preloaded to bias the second body 204 toward the first body 202. This may correspond to the thawing conditions of the reagents. In the normal position, the flange section 243 of the second body 204 may further be arranged on the end of the pole piece 256. The agent may swell in ice conditions. In the illustrated embodiment, the injector 800 may be substantially rigid in the radial direction. Thus, the reagent may expand along the axial direction 'D'. In addition, the frozen reagent may exert a pressure 'P' on the second body 204 due to the expansion, causing the second body 204 to be displaced away from the first body 202 along the axial direction 'D'. The pressure 'P' may be applied by expanding ice formed under the icing conditions of the agent. The first spring portion 802A and the second spring portion 802B are each also deformed to allow the second body 204 to move along the axial direction 'D'. Specifically, the first intermediate portion 806 of each of the first and second spring portions 802A, 802B may deform to allow the second body 204 to move relative to the first body 202. However, the biasing force 'F2' exerted by the first and second spring portions 802A, 80B may limit the maximum movement of the second body 204 and retain the second body 204 at a distance 'D4' (shown in fig. 17) from the pole piece 256. This may correspond to an extended position or configuration of the second body 204. Thus, the biasing force 'F2' exerted by the first and second spring portions 802A, 802B due to the preload may counteract the pressure 'P' exerted by the reagent under icing conditions. The expansion chamber 832 formed by the movement of the second body 204 may also provide space for the reagent to expand during freezing. The sealing member 287 may prevent any leakage of reagent from the injector 800. The reagent may be reduced after subsequent thawing of the reagent. The pressure 'P' may no longer be applied to the second body 204. After the ice melts, the first and second spring portions 802A, 802B may bias the second body 204 toward the first body 202. Specifically, the first and second spring portions 802A, 802B may displace the second body 204 and retain the second body 204 against the end of the pole piece 256.

Accordingly, the injector 800 may include a freeze protection feature to allow safe expansion of the reagent during freezing, the freeze protection feature including a spring member 802. Accordingly, any damage to the injector 800 due to the frozen reagent may be significantly prevented. Any leakage of reagent may also be prevented by the sealing member 287. After the reagent melts, the first and second spring portions 802A, 802B of the spring member 802 further move the second body 204 to its normal position. The first and second spring portions 802A and 802B may also serve as a top cover for the first body 202. Specifically, the second intermediate portions 810 of the first and second spring portions 802A, 802B may at least partially cover the first end 805 of the first body 202. Accordingly, second intermediate portion 810 may retain at least one core or internal component of injector 800 (e.g., valve assembly 216) within first body 202. Second intermediate portion 810 may also flex away from first body 202 to allow for servicing of one or more core components of injector 800. Specifically, second intermediate portion 810 may allow one or more components of valve assembly 216 to be removed from first body 202.

FIG. 18 illustrates a perspective view of an injector 900 according to another aspect of the present disclosure. The injector 900 is substantially similar in structure and function to the injector 400 described above with reference to fig. 8-11. Accordingly, like parts are provided with like reference numerals. However, the spring member 902 of the injector 600 is arranged between the reagent outlet tube 408 and the first body 402. The reagent outlet tube 408 defines a tube axis 'T' that is inclined at an angle 'Ai' relative to the longitudinal axis 'L1' of the injector 900. Additionally, instead of the second body 404, the reagent outlet tube 408 is movable relative to the first body 402. Specifically, the reagent outlet tube 408 is movable in an inclined direction 'Di' substantially parallel to the tube axis 'T'. Thus, the movement of the reagent outlet tube 408 is inclined at an angle 'Ai' relative to the longitudinal axis 'L1'. A spring member 902 movably connects the reagent outlet tube 408 to the first body 402. Additionally, the spring member 902 is preloaded to bias the reagent outlet tube 408 toward the first body 402. The spring member 902 may also restrict movement of the reagent outlet tube 408 in response to expansion of the reagent during freezing. When the reagent melts, the spring member 902 may further move the reagent outlet tube 408 to the normal position (as shown in fig. 18).

In an embodiment, the spring member 902 may be a substantially flat spring. Additionally, the spring member 902 may be formed by at least one stamping or molding process. In further embodiments, the spring member 902 may be made of a metal or metal alloy. The spring member 902 includes a main portion 904, a pair of elongated portions 906 (only one shown in fig. 18), and a pair of intermediate portions 908 (only one shown in fig. 18) disposed between the main portion 904 and the corresponding elongated portions 906.

The main portion 904 is disposed on a flange section 910 of the reagent outlet tube 408. In addition, the main portion 904 presses against an upper surface 911 (shown in fig. 8) of the flange section 910. The main portion 904 may have an annular shape defining a main orifice 912. Although in the illustrated embodiment, the primary orifice 912 has a substantially circular shape, other shapes of the primary orifice 912 are contemplated within the scope of the present disclosure. Such shapes of the main aperture 912 may include polygonal, elliptical, and the like. The main orifice 912 is disposed at least partially around the reagent outlet tube 408. Thus, the main orifice 912 allows the reagent outlet tube 408 to extend therethrough. In an embodiment, the main portion 904 may be press fit over the flange section 910 of the reagent outlet tube 408. In other embodiments, the main portion 904 may be attached to the reagent outlet tube 408 by a number of different methods (such as welding, brazing, adhesives, mechanical fasteners, etc.). In another embodiment, the main portion 904 may be removably connected to the reagent outlet tube 408.

The intermediate portion 908 may extend from diametrically opposite sides of the main portion 904. In the undeformed or normal state as shown in fig. 18, each intermediate portion 908 has a curvilinear shape that extends upwardly from the main portion 904 and then curves downwardly toward the respective elongate portion 906. Each intermediate portion 908 is adapted to deform to allow the reagent outlet tube 408 to move relative to the first body 402. In particular, each intermediate portion 908 deforms to allow the reagent outlet tube 408 to move away from the first body 402 in the direction of inclination 'Di'. In the deformed state, the spring member 902 may limit the maximum movement of the reagent outlet tube 408 relative to the first body 402.

Each elongate portion 906 includes a substantially planar shape. In the illustrated embodiment, each elongated portion 906 is connected to a receiving portion 434 of the first body 402. In an embodiment, each elongated portion 906 is connected to the first body 402 by welding. In other embodiments, each elongate portion 906 may be connected to the first body 402 by a number of different methods (e.g., brazing, mechanical fasteners, adhesives, etc.). In another embodiment, each elongate portion 906 may be removably connected to the first body 402 by a non-permanent joining method. Such a detachable connection may enable the reagent outlet tube 408 to be removed from the first body 402, thereby allowing for repair and/or replacement of one or more internal components of the injector 900. In further embodiments, each elongate portion 906 may be connected to the first body 402 by a snap-fit connection.

In an embodiment, the spring member 902 is preloaded to bias the reagent outlet tube 408 toward the first body 402. The reagent outlet tube 408 may be biased to move against a spring member 902 in response to expansion of the reagent during freezing. The spring member 902 is further configured to limit maximum movement of the reagent outlet tube 408 relative to the first body 402 in response to expansion of the reagent during freezing.

In an embodiment, a sealing member (not shown) may be arranged between the reagent outlet tube 408 and the first body 402. The sealing member may be an O-ring. The sealing member may prevent reagent from leaking from the injector 900 during movement of the reagent outlet tube 408.

When the reagent outlet tube 408 is in the normal position, as shown in fig. 18, the spring member 902 is preloaded to bias the reagent outlet tube 408 toward the first body 402. This may correspond to the thawing conditions of the reagents. The agent may swell in ice conditions. The frozen reagent may exert pressure on the reagent outlet tube 408 due to the expansion, causing the reagent outlet tube 408 to be displaced away from the first body 402 in the oblique direction 'Di'. The spring member 902 also deforms to allow the reagent outlet tube 408 to move in the tilt direction 'Di'. In particular, the middle portion 908 of the spring member 902 may deform to allow the reagent outlet tube 408 to move relative to the first body 402. However, the biasing force exerted by the spring member 902 may limit the movement of the reagent outlet tube 408 and retain the reagent outlet tube 408 at a predetermined distance relative to the first body 402. Thus, the biasing force exerted by the spring member 902 due to the preload may counteract the pressure exerted by the agent under icing conditions. The expansion chamber (not shown) formed by the movement of the reagent outlet tube 408 may also provide space for the reagent to expand during freezing. The sealing member may prevent any leakage of reagent from the injector 900. The reagent may be reduced after subsequent thawing of the reagent. Pressure may no longer be applied to the reagent outlet tube 408. After the ice melts, the spring member 902 may bias the reagent outlet tube 408 toward the first body 402.

Accordingly, the injector 900 may include a freeze protection feature to allow the reagent to safely expand during freezing, the freeze protection feature including a spring member 902. Accordingly, any damage to the injector 900 due to the frozen reagent may be significantly prevented. Any leakage of reagent may also be prevented by the sealing member. After the reagent melts, the spring member 902 moves the reagent outlet tube 408 further to its normal position.

While aspects of the present disclosure have been particularly shown and described with reference to the above embodiments, it will be understood by those of ordinary skill in the art that a variety of additional embodiments may be devised by modifying the disclosed machines, systems, and methods without departing from the spirit and scope of the disclosure. Such embodiments are to be understood as falling within the scope of the present disclosure as determined based on the claims and any equivalents thereof.