阅读说明：本技术 燃料喷射系统过滤器 (Fuel injection system filter ) 是由 S·奈尔 M·B·纳加拉贾 R·穆图库马尔 P·巴拉桑达拉姆 于 2018-03-02 设计创作，主要内容包括：一种用于燃料喷射系统(104)的过滤器(122)包括限定纵轴(156)的主体(154),第一端面(160),第二端(162),在第一端面(160)和第二端(162)之间延伸的外表面(164),限定了内腔(168)的内表面(166),内腔(168)在第一端面(160)处封闭并且在第二端(162)处开放。主体(154)还限定出形成在外表面(164)中的至少一个穿孔部分(182),其从外表面(164)延伸到内表面(166),沿着外表面(164)轴向延伸的至少一个狭槽(170)。狭槽(170)是开放的并且与第一端面(160)流体连通,并且沿着外表面(164)限定了边缘(174)。边缘(174)在狭槽(170)和穿孔部分(182)之间提供流体连通。另外,燃料喷射系统(104)的边缘(174)和入口通道(130)适于限定第一过滤区(150)。穿孔部分(182)限定第二过滤区(152)。(A filter (122) for a fuel injection system (104) includes a body (154) defining a longitudinal axis (156), a end face (160), a second end (162), an outer surface (164) extending between a end face (160) and the second end (162), an inner surface (166) defining an internal cavity (168), the internal cavity (168) being closed at a end face (160) and open at the second end (162). the body (154) further defines at least perforated portions (182) formed in the outer surface (164) extending from the outer surface (164) to the inner surface (166), at least slots (170) extending axially along the outer surface (164). the slots (170) are open and in fluid communication with the end face (160), and an edge (174) is defined along the outer surface (164). the edge (174) provides fluid communication between the slots (170) and the perforated portions (182). additionally, the edge (174) and the inlet channel (130) of the fuel injection system (104) and the second end (162) define a filter region ().)

1, A filter (122) for a fuel injection system (104), the filter (122) comprising:

a body (154) defining a longitudinal axis (156), an th end face (160), a second end (162) opposite the th end face (160), an outer surface (164) extending between the th end face (160) and the second end (162), an inner surface (166) defining a lumen (168), the lumen (168) being closed at the th end face (160) and open at the second end (162), at least perforated portions (182) formed in the outer surface (164) extending from the outer surface (164) to the inner surface (166), at least slots (170) extending axially along the outer surface (164), the at least slots (170) being open and in fluid communication with the th end face (160) and defining an edge (174) along the outer surface (164), the edge (174) providing fluid communication between the at least slots (170) and the at least perforated portions (182), wherein

The rim (174) and inlet passage (130) of the fuel injection system (104) are adapted to define an th filtering zone (150), and

the at least perforated sections (182) define a second filtering zone (152).

2. The filter (122) of claim 1, wherein the at least slots (170) are adapted to receive fuel from the fuel injection system (104) to the filter (122), and the open second end (162) of the filter (122) facilitates release of the fuel from the filter (122).

3. The filter (122) of claim 1) Wherein the body (154) comprises a tubular structure with a filter length (F) along the longitudinal axis (156)_L) The at least slots (170) extending from the end face (160) along the outer surface (164) and terminating before the second end (162) with a slot length less than a filter length (F)_L)。

4. The filter (122) of claim 1, wherein the outer surface (164) proximate the second end (162) defines an uninterrupted surface.

5. The filter (122) of claim 1, wherein a cross-sectional diameter of the outer surface (164) proximate the end face (160) and a cross-sectional diameter of the outer surface (164) proximate the second end (162) are each greater than a cross-sectional diameter of the outer surface (164) at the filtration zone (150).

6. The filter (122) of claim 1, wherein the outer surface (164) defines a recess (180) on the second filtering zone (152), the at least perforated portions (182) being formed in the recess (180).

7. The filter (122) of claim 1, wherein the th filtering zone (150) is adapted to filter particles having a size greater than 75 micrometers (μ ι η) by 1 millimeter (mm) by 1mm, and the second filtering zone (152) is adapted to filter particles having a size greater than 1mm x 65 μ ι η by 65 μ ι η.

8. The filter (122) of claim 1, wherein the outer surface (164) includes four slots and four perforated portions.

9. The filter (122) of claim 1, wherein the lumen (168) is defined by a plurality of planes arranged in series about the longitudinal axis (156) that impart a polygonal cross-section to the lumen (168) from the second end (162),

wherein the at least perforated portions (182) are exposed on or more of the plurality of planes.

10, A fuel injection system (104) for an engine (102), the fuel injection system (104) comprising:

an inlet passage (130) to receive fuel; and

a filter (122) disposed within the inlet channel (130), the filter (122) having a body (154), the body (154) defining a longitudinal axis (156), a th end face (160), a second end (162) opposite the th end face (160), an outer surface (164) extending between the th end face (160) and the second end (162), an inner surface (166) defining an inner cavity (168), the inner cavity (168) being closed at the th end face (160) and open at the second end (162), at least perforated portions (182) formed in the outer surface (164) extending from the outer surface (164) to the inner surface (166), at least slots (170) extending axially along the outer surface (164), the at least slots (170) being open and in fluid communication with the th end face (160) and defining an edge (174) along the outer surface (164), the edge (174) providing fluid communication between the at least slots (170) and the at least perforated portions (24), wherein the fluid communication is provided

The rim (174) and the inlet passage (130) define a th filtration zone (150), and

the at least perforated sections (182) define a second filtering zone (152).

Technical Field

More specifically, the present invention relates to an filter for a fuel injector that includes multiple filtering zones to filter fuel supplied to the fuel injector.

Background

In some examples, the pressure in such a common rail is between 250 bar and 2200 bar (i.e., between 3600psi and 32000 psi.) fuel injectors used in such high pressure environments are susceptible to poor quality fuel.

U.S. publication No.2009/120869 relates to edge filters for installation in high pressure conduits of fuel injection systems.

Disclosure of Invention

In aspects, the invention is directed to a filter for a fuel injection system, the filter including a body defining a longitudinal axis, a th end face, a second end opposite the st end face, an outer surface extending between the th end face and the second end, an inner surface defining an internal cavity closed at the th end face and open at the second end, the body further defining at least perforated portions formed in the outer surface extending from the outer surface to the inner surface, and at least slots extending axially along the outer surface, at least of the slots being open and in fluid communication with the th end face and defining an edge along the outer surface, the edge providing fluid communication between at least of the slots and at least of the perforated portions.

In another aspect , the present disclosure is directed to a fuel injection system for an engine, the fuel injection system including an inlet passage and a filter, the inlet passage adapted to receive fuel, the filter positioned within the inlet passage, the filter defining a body having a longitudinal axis, a 0 th end face, a second end opposite the 1 th end face, an outer surface extending between the 2 th end face and the second end, and an inner surface defining an inner cavity closed at the th end face and open at the second end, the body further defining at least perforated sections formed in the outer surface extending from the outer surface to the inner surface, and at least slots extending axially along the outer surface, at least slots being open and in fluid communication with the th end face and defining an edge along the outer surface, the edge providing fluid communication between at least slots and at least perforated sections, the edge and the inlet passage defining a filter zone, and the perforated section defining a second filter zone.

In another aspect , the invention is directed to a fuel injector for a fuel injection system, the fuel injector including an inlet arm and a filter, the filter arm including an inlet passage configured to receive fuel, the filter being located within the inlet passage, the filter having a body defining a longitudinal axis, a 0 th end face, a second end opposite the 1 th end face, an outer surface extending between the 2 th end face and the second end, an inner surface defining an interior cavity closed at the th end face and open at the second end, the body further defining at least perforated sections formed in the outer surface extending from the outer surface to the inner surface, and at least slots extending axially along the outer surface, at least of the slots being open and in fluid communication with the th end face and defining an edge along the outer surface, the edge providing fluid communication between at least of the slots and at least of the perforated sections, the edge and the inlet passage defining a filter region, the perforated section defining a second filter region.

Drawings

FIG. 1 is a schematic illustration of an engine system having a fuel injection system according to the concepts of the present disclosure;

FIG. 2 is a fuel injector of the fuel injection system of FIG. 1 having a filter disposed within an inlet passage of the injector, according to the concepts of the present disclosure;

FIG. 3 is a front isometric view of a filter according to the concepts of the present invention;

FIG. 4 is a cross-sectional view of a filter according to the concepts of the present invention; and is

Fig. 5 is a rear isometric view of a filter according to the concepts of the present invention.

Detailed Description

Referring to FIG. 1, an engine system 100 is shown, the engine system 100 includes an internal combustion engine 102 and a fuel injection system 104 for the internal combustion engine 102. the internal combustion engine 102 may be referred to simply as the engine 102. the engine 102 may be a compression ignition engine, such as a diesel engine, although aspects of the present invention may be applicable to several engine types. in examples, the engine 102 may be adapted for use with machines associated with construction, mining, forestry, farming, stationary power, and the like.

The fuel injection system 104 may be configured to inject fuel, such as diesel fuel, into one or more combustion chambers of the engine 102. delivering fuel into the combustion chambers and subsequent combustion of the fuel may generate engine power. the fuel injection system 104 includes a common rail 108 and a plurality of fuel injectors in the illustrated example, the fuel injection system 104 includes four fuel injectors, namely a th fuel injector 110 ', a second fuel injector 110 ", a third fuel injector 110 '", and a fourth fuel injector 110 "". each fuel injector 110 ', 110 ", 110 '", 110 "" may be fluidly coupled to the common rail 108 to receive fuel from the common rail 108. these fuel injectors 110 ', 110 ", 110 '", 110 "" may also be coupled to or more cylinders, respectively, of the engine 102 for delivering fuel to the combustion chambers of the engine 102. for example, the cylinders of the engine 102 are four numbered, namely a th cylinder 112 ', a second cylinder 112 ", a third cylinder 112 '", and a fourth cylinder 112 "". provided that the fuel injectors 110 ", 110" ', 110 ", 112" ". the fuel injectors may be directly injected into the common rail 108, or into the common rail 108, although the invention is not limited to the invention, it may be embodied by the fuel injectors 110", a pressurized fuel injection system may be embodied in the sense that the invention, may be provided that the fuel injectors 110, may be directly injected into the fuel injection system 102, may be provided that the common rail 108, 110, may be provided that the fuel injectors, 110, may be provided that the fuel injectors, 110, may be directly injected from a pressurized fuel injection system, 110, or otherwise, 110, and the fuel injection system may be provided in various aspects of the invention may be used in the invention, and the common rail 108, may be used in the invention.

Referring to FIG. 2, the th fuel injector 110 ' of the four fuel injectors 110 ', 110 "', 110" ". for ease of reference and understanding, the th fuel injector 110 ' may be referred to simply as fuel injector 110. it will be understood that the description for fuel injector 110 will apply to all of the remaining fuel injectors 110", 110 "' 110" ", of the fuel injection system 104.

The fuel injector 110 includes an injector body 120, a filter 122, and a control valve 124. Injector body 120 includes an inlet arm 128 defining an inlet passage 130. Fuel injector 110 may be fluidly coupled to common rail 108 (or a conduit 132 to common rail 108, see fig. 1) via an inlet passage 130 to receive fuel from common rail 108. The injector body 120 may also include an outlet passage 136 for releasing and delivering fuel into a corresponding combustion chamber of the engine 102. Further, injector body 120 may include an interior space 140, where interior space 140 may house control valve 124 and associated components of control valve 124. The control valve 124 may include a solenoid mechanism 144, a biasing member 146, and a valve pin 148, each of which may cooperate to vary the passage of fuel flow defined within the fuel injector 110. In this manner, the control valve 124 may regulate the injection and release of fuel into the engine 102 through the outlet passage 136. The construction and operation of such control valves for regulating the flow of fuel through the outlet passage 136 is well known and will not be described in detail.

Referring to FIGS. 2, 3, and 4, filter 122 is adapted to be positioned within inlet passage 130 to filter fuel received into fuel injector 110 from common rail 108 (see orientation, FIG. 1). Filter 122 may be disposed upstream of injector body 120 to ensure that fuel delivered to outlet passage 136 during an injection event is free of debris. Filter 122 is adapted to filter fuel in multiple stages. more particularly, filter 122 is adapted to filter fuel received from common rail 108 in two stages to this end, filter 122 defines two filter zones-a th filter zone 150 (see FIG. 2) and a second filter zone 152 (see FIG. 4) -in examples, the th filter zone 150 is adapted to filter particles having a size greater than 75 microns (μm). times.1 millimeter (mm). times.1 mm.

Referring to fig. 3, 4, and 5, further details of the filter 122 are described, the filter 122 may be an edge filter including a body 154, such as an elongated body, the body 154 facilitating a filtration process of fuel on an edge formed on the filter (discussed further below.) the body 154 may include a tubular structure, such as having a substantially cylindrical profile defining a longitudinal axis 156. various other shapes and profiles of the body 154 are also contemplated, such as an oval shape. the body 154 defines a second end 158, the second end 158 having a second end 160 and a second end 162. the second end 162 is opposite the second end 160. further, the body 154 includes an outer surface 164 defined above the body 154, the body 154 extending between a second end 160 and a second end 162. the body 154 also includes an inner surface 166 defining an interior cavity 168 of the body 154 (see fig. 4 and 5). although the shape of the interior cavity 168 may vary, the interior cavity 168 may define a hollow injector of the body 154, which is also cylindrical, more specifically, the interior cavity 168 is at the second and closes the second end 160. opening the second end 162. releasing the filter 122 from the second end 162 of the filter 122.

Further, as part of of the -th filter zone 150, the body 154 includes at least slots 170 defined on the body 154. in the illustrated example, four slots 170 are shown, a greater or lesser number of slots 170 are contemplated, the slots 170 are disposed equidistantly on the outer surface 164 about the longitudinal axis 156. it is understood that the description of these four slots will be discussed with only a single slot 170 and that this description is applicable to each of the four slots 170. as shown, the slots 170 can include a U-shaped cross-sectional profile that is linear, axial (i.e., along the longitudinal axis 156) and extends along the outer surface 164 of the body 154. the slots 170 are open and are in fluid communication with the -th end face 160 and the outer surface 164. for example, the slots 170 can include openings 172 formed on the -th end face 160.

Further, the slot 170 defines an edge 174 along the outer surface 164 of the body 154. in the case of the linear profile of the slot 170, the edge 174 also has a linear profile. accordingly, the edge 174 is also defined along the longitudinal axis 156 of the body 154. in the assembly of the filter 122 within the inlet passage 130, the edge 174 and the inlet passage 130 (i.e., the inner wall 176 of the inlet passage 130) are separated by a gap 178 (see FIG. 2) and are, in turn, adapted to define an -th filter region 150. further, the body 154 includes a filter length F along the longitudinal axis 156_LThe slit 170 extends from the -th end face 160 along the outer surface 164 and terminates before the second end 162, with a slit length S_LLess than filter length F_L。

Further, as part of second filter zone 152, outer surface 164 of body 154 defines recess 180 on second filter zone 152 recess 180 is a generally rectangular depression formed on outer surface 164 of body 154, although other shapes and contours of recess 180 are contemplated, such as an irregular shape in the embodiment, recess 180 extends and follows filter length F of body 154_LIn the depicted example, four perforated portions 182 are shown, each perforated portion 182 being formed in a dedicated recess 180. A greater or lesser number of perforated portions 182 are contemplated, these perforated portions 182 being arranged equidistantly on the outer surface 164 and formed between successively arranged slots 170 about the longitudinal axis 156. As with the discussion of slots 170, the description of these four perforated portions 182 may be discussed only by a single perforated portion 182, and it will be understood that this description will apply to every of the four perforated portions 182. the perforated portions 182 may include a plurality of holes arranged in accordance with a plurality of rows and columns in the recesses 180. however, it is possible to vary the arrangement of such holes, for example, by having irregularly positioned holes in implementations, the size of the holes may be varied and/or the number of holes may be increased or decreased to achieve an increase or decrease in the flow rate of fuel through the perforated portions 182 and the recesses 184, along the bottom of the filter 180 as well as long recesses 180Degree F_LTo define the perforated portion 182. The perforated portion 182 (i.e., the bore of the perforated portion 182) extends from the outer surface 164 to the inner surface 166 of the lumen 168, and in this case, the lumen 168 is in fluid communication with the recess 180 through the perforated portion 182.

In addition, the cross-sectional diameter of the outer surface 164 proximate the end face 160 at and the cross-sectional diameter of the outer surface 164 proximate the second end face 162 are each greater than the cross-sectional diameter of the outer surface 164 at the filter zone 150 at . in this manner, when the filter 122 is assembled within the inlet passage 130, the outer surface 164 is adapted to define with the inner wall 176 a notch 188 (see FIG. 2). the notch 188 and the gap 178 enable the edge 170 to fluidly communicate the slot 170 and the perforated portion 182 with one another, while the edge 174 provides fluid communication between the slot 170 and the perforated portion 182 through the gap 178. additionally, the outer surface 164 proximate the second end 162 defines an uninterrupted surface 186. the uninterrupted surface 186 is a surface formed above the body 154 of the filter 122 that can be press-fit and fully engage the inlet passage 130 (or the inner wall 176) when the filter 122 is positioned within the inlet passage 130. in doing so, since the filter 122 receives fuel during operation, fluid (fuel) is prevented from flowing past the outer surface 164 at the second end 162.

Further, the interior cavity 168 (or the interior surface 166) is defined by a plurality of planes that are continuously arranged about the longitudinal axis 156. this continuous array of surfaces imparts a polygonal cross-section to the interior cavity 168 from the second end 162 As shown, the perforated portion 182 is exposed at or more of the plurality of planes.

In embodiments, the cross-sectional diameter of the outer surface 164 proximate the end face 160 is smaller than the cross-sectional diameter of the outer surface 164 proximate the second end 162, and the inlet passage 130 is tapered, this arrangement may enable a secure interlock or fit between the second end 162 and the inlet passage when the filter 122 is assembled within the inlet passage 130, thereby not allowing incoming fuel to flow through the second end 162 and around both filtering regions (i.e., the th filtering region 150 and the second filtering region 152).

The body 154 of the filter 122 may be made of a metallic material, but alloys as well as various other advanced polymers and plastics are also contemplated the filter 122 may also be manufactured by a 3-D printing process in implementations the filter 122 may be manufactured by casting in implementations the filter 122 is produced using conventional operations including, for example, turning, boring, and milling.

Industrial applicability

The debris in the fuel may be residue left from manufacturing or processing in any upstream components of the fuel injection system 104 (e.g., pumps, conduits, valves, etc.). Debris may also be introduced during maintenance of the fuel injection system 104. Debris may also accompany the fuel flow. Since the tolerances of the components of the control valve 124 may depend on the injection pressure accompanying the fuel injection event, and since such debris may damage injector components, a filter 122 is employed that provides two stages of filtering fuel.

During fuel delivery, pressurized fuel is received by common rail 108 and is stepped into fuel injector 110 through inlet passage 130 inlet coupled to common rail 108 as fuel flows through inlet passage 130 (see direction A), the fuel contacts end face 160 of filter 122 and, due to the pressurized flow of fuel, flows into slot 170 through opening 172 of slot 170. upon entering slot 170, the fuel may traverse a length S of slot 170_LThe fuel is forced into a gap 178 defined between the rim 174 and an inner wall 176 of the inlet passage 130. As a result, the fuel flows substantially transversely to the body 154 along a circumferential direction (see direction, B) defined by the curvature of the rim 174. As the fuel flows through the gap 178, the rim 174 and the inlet passage 130 filter particles having a size, for example, greater than 75 micrometers (μm) by 1 millimeter (mm) by 1 mm. in implementations, the rim 174 and the inlet passage 130 (i.e., filter zone 150, see FIG. 2) may filter particles having a size that is larger or smallerThe filter zone 150 defined by the rim 174 and the inlet passage 130 also defines a filtration stage of fuel that purifies the fuel of relatively large sized particles .

After purging the th filter zone 150, the -induced or continuous pressure supply of fuel may further step force the fuel into the gap 188 defined between the outer surface 164 and the inner wall 176 at the th filter zone 150 after which the fuel flows into the recess 180, causing the fuel to further step flow through the perforated portion 182 formed in the recess 180 (i.e., from the outer surface 164 to the inner surface 166 in a radial direction relative to the filter 122, see direction C.) the perforated portion 182 filters particles having a size, for example, greater than 1mm x 65 μm as the fuel flows from the outer surface 164 to the inner surface 166. in implementations, the second filter zone 152 may filter particles of a larger or smaller size as the size of the perforations of the perforated portion 182 may vary depending on the application and actual filtering requirements.

In effect, the filtering of the fuel at the second filter region 152 steps through the purification of the amount of fuel that has been filtered at the filter region 150 due to the two-stage purification of the fuel, the fuel obtained by the fuel injector 110 interferes with tolerances between injector components, resulting in longer injector life, higher injection efficiency and higher injection accuracy.

It should be understood that the foregoing description is intended for illustrative purposes only and is not intended to limit the scope of the present disclosure. Thus, those skilled in the art will appreciate that other aspects of the invention can be obtained from a study of the drawings, the disclosure and the appended claims.