Vacuum pump exhaust reed valve with pressure relief
阅读说明:本技术 具有压力泄放的真空泵排放簧片阀 (Vacuum pump exhaust reed valve with pressure relief ) 是由 詹姆斯·A·多兹 保罗·安德鲁·雷格 西蒙·图利 于 2020-03-13 设计创作,主要内容包括:本申请涉及具有压力泄放的真空泵排放簧片阀。一种系统包括真空泵和联接到真空泵的排放簧片阀。排放簧片阀包括簧片阀密封件、刚性联接到真空泵的连接部分、以及刚性地联接到连接部分和主体的杆部分。簧片阀密封件界定密封表面和凹槽,该凹槽凹入密封表面以下。密封表面可操作以接触主体并形成密封,而凹槽可操作以形成未密封的空间,加压液体和/或蒸汽可从该未密封的空间在主体和簧片阀密封件之间逸出。(The present application relates to a vacuum pump exhaust reed valve with pressure relief. A system includes a vacuum pump and an exhaust reed valve coupled to the vacuum pump. The discharge reed valve includes a reed valve seal, a connection portion rigidly coupled to the vacuum pump, and a stem portion rigidly coupled to the connection portion and the body. The reed valve seal defines a sealing surface and a groove recessed below the sealing surface. The sealing surface is operable to contact the body and form a seal, while the groove is operable to form an unsealed space from which pressurized liquid and/or vapor can escape between the body and the reed valve seal.)
1. A system, comprising:
a vacuum pump;
an exhaust reed valve coupled to the vacuum pump, the exhaust reed valve comprising:
a connecting portion rigidly coupled to the vacuum pump, an
A rod portion rigidly coupled to the connecting portion and the body; and
a reed valve seal defining a sealing surface and a groove recessed below the sealing surface;
wherein the sealing surface is operable to contact the body and create a seal, and the groove is operable to create an unsealed space between the body and the sealing surface, thereby allowing pressurized liquid and/or vapor to escape between the body and the reed valve seal.
2. The system of claim 1, wherein the reed valve seal further comprises:
an outer wall defining an outer boundary of the reed valve seal; and
an inner wall defining an inner boundary of the reed valve seal;
wherein the groove extends through the reed valve seal, through the outer wall and the inner wall.
3. The system of claim 2, wherein the groove maintains the same cross-sectional shape from the inner wall to the outer wall.
4. The system of claim 2, wherein the cross-sectional shape of the groove varies from the inner wall to the outer wall.
5. The system of any of claims 1-4, wherein the shape of the sealing surface is substantially the same as the shape of the body.
6. The system of any of claims 2-4, wherein a perimeter of the outer wall is substantially the same as a perimeter of the body.
7. The system of any of claims 1-4, wherein the groove comprises a plurality of grooves distributed around the sealing surface.
8. A system, comprising:
a vacuum pump;
an exhaust reed valve coupled to the vacuum pump, the exhaust reed valve comprising:
a connecting portion rigidly coupled to the vacuum pump, an
A rod portion rigidly coupled to the connecting portion and a body, the body defining a bore extending completely through the body; and
a reed valve seal defining a sealing surface operable to contact the body and form a seal;
wherein the aperture is sized to allow pressurized liquid and/or vapor to escape therethrough when the vacuum pump is not operating, and the aperture is sized to prevent pressurized liquid and/or vapor from escaping therethrough at a rate that prevents a vacuum from being created when the vacuum pump is operating.
9. The system of claim 8, wherein the diameter of the aperture is about 0.3mm to 1.0 mm.
10. The system of claim 8, wherein the diameter of the aperture is about 0.1mm to 1.5 mm.
11. The system of any of claims 8-10, wherein the bore comprises a cylindrical cutout extending completely through the body.
12. The system of claim 11, wherein the cylindrical cutout comprises a constant cross-sectional shape.
13. The system of any of claims 8-10, wherein the aperture comprises a non-constant cross-sectional shape.
14. The system of any one of claims 8-10, wherein the aperture comprises a plurality of bleed apertures on the discharge reed valve.
15. A system, comprising:
a vacuum pump;
an exhaust reed valve coupled to the vacuum pump, the exhaust reed valve comprising:
a body defining a bore extending completely through the body;
a connecting portion rigidly coupled to the vacuum pump, an
A rod portion rigidly coupled to the connecting portion and the body; and
a reed valve seal defining a sealing surface and a groove recessed below the sealing surface;
wherein the sealing surface is operable to contact the body and create a seal, and the groove is operable to create an unsealed space between the body and the sealing surface, allowing pressurized liquid and/or vapor to escape between the body and the reed valve seal, and
wherein the aperture is sized to allow pressurized liquid and/or vapor to escape therethrough when the vacuum pump is not operating, and the aperture is sized to prevent pressurized liquid and/or vapor from escaping therethrough at a rate that prevents a vacuum from being created when the vacuum pump is operating.
16. The system of claim 15, wherein the reed valve seal further comprises:
an outer wall defining an outer boundary of the reed valve seal; and
an inner wall defining an inner boundary of the reed valve seal;
wherein the groove extends through the reed valve seal, through the outer wall and the inner wall.
17. The system of claim 16, wherein the groove maintains the same cross-sectional shape from the inner wall to the outer wall.
18. The system of claim 16, wherein the cross-sectional shape of the groove varies from the inner wall to the outer wall.
19. The system of any of claims 15-18, wherein the bore comprises a cylindrical cutout extending completely through the body.
20. The system of claim 19, the cylindrical cutout comprising a constant cross-sectional shape.
Technical Field
The present disclosure relates generally to systems for regulating pressure within a vacuum pump associated with an internal combustion engine system.
Background
The internal combustion engine system may include a vacuum pump. In such systems, the vacuum pump may generate a vacuum of 0.7-0.9 bar and may be used to brake auxiliary equipment, operate pneumatic equipment, position a damper (e.g., exhaust damper), operate a valve (e.g., EGR valve), switch intake manifold, turbocharger control, and the like. The vacuum pump may be a conventional type of pump that reciprocates a piston; however, the vacuum pump may also be a vane pump with a rotary drive. The single vane vacuum pump may be mounted directly to the cylinder head and driven by the camshaft. Vacuum pumps require oil for lubrication, heat dissipation and internal sealing. Typically, the oil is supplied through a conduit in the cylinder head or camshaft and returned to the engine with the exhaust gases.
In some vacuum pumps, reed valves are included to reduce the work load on the pump when a desired vacuum level is reached. The reed valve also maintains vacuum pressure in the pump when the engine is off. In some cases, the vacuum pressure in the pump, maintained by the reed valve, may draw additional oil into the pump and may cause a hydraulic lock. Furthermore, when the engine is started with the vacuum pump full of oil, the cam gear system is heavily loaded, resulting in an overload condition and potential failure. Therefore, it is not desirable to include a complete reed valve to maintain vacuum pressure. Complete removal of the reed valve allows the vacuum pump to pressure balance the crankcase and limits the amount of oil drawn into the pump. However, the absence of reed valves may result in additional crankcase pressure pulsations, resulting in higher peak ventilation flow pulsations. Therefore, it is also not desirable to completely remove the reed valve.
Disclosure of Invention
In one embodiment, a system includes a vacuum pump and an exhaust reed valve (exhaust valve) coupled to the vacuum pump. The discharge reed valve includes a reed valve seal, a connection portion rigidly coupled to the vacuum pump, and a stem portion rigidly coupled to the connection portion and the body. The reed valve seal defines a sealing surface and a groove recessed below the sealing surface. The sealing surface is operable to contact the body and form a seal, while the groove is operable to form an unsealed space from which pressurized liquid and/or vapor can escape between the body and the reed valve seal.
In another embodiment, a system comprises:
a vacuum pump;
an exhaust reed valve coupled to the vacuum pump, the exhaust reed valve comprising:
a connecting portion rigidly coupled to the vacuum pump, an
A rod portion rigidly coupled to the connecting portion and the body; and
a reed valve seal defining a sealing surface and a groove recessed below the sealing surface;
wherein the sealing surface is operable to contact the body and create a seal, and the groove is operable to create an unsealed space between the body and the sealing surface, thereby allowing pressurized liquid and/or vapor to escape between the body and the reed valve seal.
In some embodiments, the reed valve seal further comprises: an outer wall defining an outer boundary of the reed valve seal; and an inner wall defining an inner boundary of the reed valve seal; wherein the groove extends through the reed valve seal, through the outer wall and the inner wall.
In some embodiments, the groove maintains the same cross-sectional shape from the inner wall to the outer wall.
In some embodiments, the cross-sectional shape of the groove varies from the inner wall to the outer wall.
In some embodiments, the shape of the sealing surface is substantially the same as the shape of the body.
In some embodiments, a perimeter of the outer wall is substantially the same as a perimeter of the body.
In some embodiments, the groove comprises a plurality of grooves distributed around the sealing surface.
In another embodiment, a system includes a vacuum pump and an exhaust reed valve coupled to the vacuum pump. The discharge reed valve includes a reed valve seal, a connection portion rigidly coupled to the vacuum pump, and a stem portion rigidly coupled to the connection portion and a body defining a bore extending completely through the body. The reed valve seal defines a sealing surface operable to contact the body and form a seal. The aperture is sized to allow pressurized liquid and/or vapor to escape through the aperture when the vacuum pump is not operating. The aperture is also sized to prevent pressurized liquid and/or vapor from escaping through the aperture at a rate that prevents a vacuum from being created when the vacuum pump is operating.
In another embodiment, a system includes:
a vacuum pump;
an exhaust reed valve coupled to the vacuum pump, the exhaust reed valve comprising:
a connecting portion rigidly coupled to the vacuum pump, an
A rod portion rigidly coupled to the connecting portion and a body, the body defining a bore extending completely through the body; and
a reed valve seal defining a sealing surface operable to contact the body and form a seal;
wherein the aperture is sized to allow pressurized liquid and/or vapor to escape therethrough when the vacuum pump is not operating, and the aperture is sized to prevent pressurized liquid and/or vapor from escaping therethrough at a rate that prevents a vacuum from being created when the vacuum pump is operating.
In some embodiments, the diameter of the hole is about 0.3mm to 1.0 mm.
In some embodiments, the diameter of the hole is about 0.1mm to 1.5 mm.
In some embodiments, the bore comprises a cylindrical cutout extending completely through the body.
In some embodiments, the cylindrical cutout comprises a constant cross-sectional shape.
In some embodiments, the aperture comprises a non-constant cross-sectional shape.
In some embodiments, the aperture comprises a plurality of bleed apertures located on the discharge reed valve.
In another embodiment, a system includes a vacuum pump and an exhaust reed valve coupled to the vacuum pump. The discharge reed valve includes a connection portion rigidly coupled to the vacuum pump, a stem portion rigidly coupled to the connection portion, and a body defining a bore extending completely through the body. The reed valve seal defines a sealing surface and a groove recessed below the sealing surface. The sealing surface is operable to contact the body and create a seal, and the groove is operable to create an unsealed space between the body and the sealing surface, thereby allowing pressurized liquid and/or vapor to escape between the body and the reed valve seal. The aperture is sized to allow pressurized liquid and/or vapor to escape therethrough when the vacuum pump is not operating, and the aperture is sized to prevent pressurized liquid and/or vapor from escaping therethrough at a rate that prevents a vacuum from being created when the vacuum pump is operating.
In another embodiment, a system comprises:
a vacuum pump;
an exhaust reed valve coupled to the vacuum pump, the exhaust reed valve comprising:
a body defining a bore extending completely through the body;
a connecting portion rigidly coupled to the vacuum pump, an
A rod portion rigidly coupled to the connecting portion and the body; and
a reed valve seal defining a sealing surface and a groove recessed below the sealing surface;
wherein the sealing surface is operable to contact the body and create a seal, and the groove is operable to create an unsealed space between the body and the sealing surface, allowing pressurized liquid and/or vapor to escape between the body and the reed valve seal, and
wherein the aperture is sized to allow pressurized liquid and/or vapor to escape therethrough when the vacuum pump is not operating, and the aperture is sized to prevent pressurized liquid and/or vapor from escaping therethrough at a rate that prevents a vacuum from being created when the vacuum pump is operating.
In some embodiments, the reed valve seal further comprises:
an outer wall defining an outer boundary of the reed valve seal; and
an inner wall defining an inner boundary of the reed valve seal;
wherein the groove extends through the reed valve seal, through the outer wall and the inner wall.
In some embodiments, the groove maintains the same cross-sectional shape from the inner wall to the outer wall.
In some embodiments, the cross-sectional shape of the groove varies from the inner wall to the outer wall.
In some embodiments, the bore comprises a cylindrical cutout extending completely through the body.
In some embodiments, the cylindrical cutout comprises a constant cross-sectional shape.
Drawings
The details of one or more implementations are set forth in the accompanying drawings and the description below. Other features, aspects, and advantages of the disclosure will become apparent from the description, the drawings, and the claims, wherein:
FIG. 1 is a front perspective view of a conventional vane-type vacuum pump.
Fig. 2 is a rear perspective view of the conventional vane vacuum pump of fig. 1.
FIG. 3 is an illustration of a reed valve seal according to a particular embodiment.
FIG. 4 is a diagrammatic view of a vane vacuum pump including a discharge reed valve with a bleed hole in accordance with certain embodiments.
Detailed Description
Following are various concepts related to methods, apparatus, and systems for bleeding pressure through an exhaust reed valve of a vacuum pump of an internal combustion engine system and more detailed descriptions of embodiments of the methods, apparatus, and systems. The various concepts introduced above and discussed in greater detail below may be implemented in any of numerous ways, as the described concepts are not limited to any particular manner of implementation. Examples of specific embodiments and applications are provided primarily for illustrative purposes.
I. Overview
A vacuum pumping system associated with an internal combustion engine may include an exhaust reed valve. The function of the discharge reed valve is to reduce the operating load of the vacuum pump once the desired vacuum level is reached. The discharge reed valve also maintains vacuum pressure in the pump when the engine is off. However, the vacuum pressure within the pump maintained by the discharge reed valve may draw additional oil into the pump and may cause hydraulic lock-up. Furthermore, when the engine is started with the vacuum pump full of oil, the cam gear system is heavily loaded, resulting in an overload condition and potential failure. Some vacuum pumping systems completely eliminate the discharge reed, resulting in a pulsation in the vent flow.
Embodiments herein relate to improvements in exhaust reed valves for vacuum pumps. One improvement may include forming a hole through the discharge reed valve. Another improvement may include forming a notch in the discharge reed valve sealing surface. Both improvements result in a partial seal between the discharge reed valve and the vacuum pump. The partial seal allows the pressure of the vacuum pump to equalize more quickly when the engine is shut down than if there was a complete seal between the exhaust reed valve and the vacuum pump. The partial sealing function also includes allowing sufficient crankcase gas to refill the pump before excess oil is drawn into the vacuum pump when the engine is shut down. Accordingly, embodiments herein provide the desired effects of including a vent reed valve (e.g., providing pressure stabilization while allowing sufficient crankcase gas to remain balanced in the pump) while eliminating the adverse effects of including such a valve (e.g., hydraulic locking and large loads on the cam drive system at start-up).
Exemplary discharge reed valve System
Fig. 1 is a front perspective view of a conventional
The
The
The
Fig. 2 is a rear perspective view of the conventional
The function of the exhaust reed valve 124 is to cover the outlet to maintain the vacuum pressure in the
In some embodiments, the discharge reed valve 124 is constructed as a single component. In other embodiments, the discharge reed valve 124 is constructed as a combination of multiple components. The discharge reed valve 124 is preferably constructed of a substantially elastic material such that the discharge reed valve 124 can undergo elastic deformation and return to its original shape. In some embodiments, the discharge reed valve 124 is constructed of metal (e.g., stainless steel, aluminum, etc.). In other embodiments, the exhaust reed valve 124 is constructed of a plastic or composite material that is suitable for the high temperatures encountered in internal combustion engines.
The discharge reed valve 124 also includes a connecting portion 130, a stem 132, and a body 134. The connecting portion 130 is rigidly coupled to the
The body 134 is rigidly coupled to the stem 132 and functions to cover the reed
As previously described, in many conventional systems, the exhaust reed valve 124 maintains the vacuum pressure in the
Fig. 3 is an illustration of a reed valve seal 300 according to a particular embodiment. The reed valve seal 300 includes a sealing surface 302, an outer wall 304, an inner wall 306, and a groove 308. The function of the reed valve seal 300 is to provide a mating surface for the discharge reed valve 124 to form a seal.
The sealing surface 302 is defined by an outer wall 304 and an inner wall 306, and is substantially the same shape as the body 134 (e.g., racetrack shape, etc.), with the perimeter of the outer wall 304 being substantially (e.g., within ten percent) the same as the perimeter of the body 134. In some embodiments, the width of the sealing surface 302 (e.g., the vertical distance between the outer wall 304 and the inner wall 306) is substantially constant. The width of the sealing surface 302 may also be non-constant such that the sealing surface is wider at some locations and narrower at other locations. The inner wall 306 defines an outlet through which liquid and/or vapor flows. In some embodiments, the shape of the outlet is substantially similar to the shape of the body 134 (e.g., a racetrack shape, etc.). The shape of the outlet may also include other shapes (e.g., oval, circular, etc.).
The groove 308 is defined by a slot in the sealing surface 302, extending from the outer wall 304 to the inner wall 306. In some embodiments, the groove 308 is recessed about 0.1mm below the sealing surface 302 and is about 2mm long. In other embodiments, the size of the groove 308 may vary depending on the type of internal combustion engine or the desired pressure level in the
The groove 308 provides a space where the discharge reed valve 124 does not form a seal with the sealing surface 302. Thus, when the exhaust reed valve 124 engages the sealing surface 302, some of the pressure within the
Figure 4 is an illustration of a
The
Example of operation of discharge reed valve System
Referring to fig. 1-2, an internal combustion engine includes a
Referring to fig. 1-4, adverse effects may be eliminated by modifying the sealing
When the internal combustion engine is shut down, the
Referring to fig. 1, 2 and 4, adverse effects may also be eliminated by modifying the discharge reed valve 124 to form the
Configuration of the exemplary embodiment
While this specification contains many specific implementation details, these should not be construed as limitations on the scope of what may be claimed, but rather as descriptions of features specific to particular implementations. Certain features that are described in this specification in the context of separate embodiments can also be implemented in combination in a single embodiment. Conversely, various features that are described in the context of a single embodiment can also be implemented in multiple embodiments separately or in any suitable subcombination. Furthermore, although features may be described as acting in certain combinations and even initially claimed as such, one or more features from a claimed combination can in some cases be excised from the combination, and the claimed combination may be directed to a subcombination or variation of a subcombination.
As used herein, the terms "approximate," "substantially," and similar terms are intended to have a broad meaning consistent with the common and accepted usage by those of ordinary skill in the art to which the subject matter of this disclosure pertains. Those skilled in the art who review this disclosure will appreciate that these terms are intended to allow for the description of certain features described and claimed without limiting the scope of these features to the precise numerical ranges provided. Accordingly, these terms should be interpreted as indicating that insubstantial or inconsequential modifications or variations of the described and claimed subject matter are considered within the scope of the invention as recited in the appended claims.
The terms "coupled," "connected," and similar terms as used herein mean that two components are directly connected or indirectly connected to each other. Such joining may be fixed (e.g., permanent) or movable (e.g., removable or releasable). Such joining may be achieved with the two components being integrally formed as a single unitary body with one another or with the two components and any additional intermediate components being integrally formed as a single unitary body with one another, with the two components being attached to one another, or with the two components and any additional intermediate components being attached to one another.
It is noted that the configuration and arrangement of the systems shown in the various exemplary embodiments are illustrative only and not limiting in nature. All changes and modifications that come within the spirit and/or scope of the described embodiments are desired to be protected. It should be understood that some features may not be necessary and embodiments lacking the same may be contemplated as within the scope of the application, the scope being defined by the claims that follow. When the language "a portion" is used, the item can include a portion of the item and/or the entire item unless specifically stated to the contrary.
Furthermore, the term "or" is used in its inclusive sense (and not in its exclusive sense) such that when used, for example, to join a list of elements, the term "or" means one, some, or all of the elements in the list. Unless expressly stated otherwise, a conjunctive such as the phrase "X, Y or at least one of Z" is understood in this context to be commonly used to express that an item, term, or the like may be: x; y; z; x and Y; x and Z; y and Z; or X, Y and Z (i.e., any combination of X, Y and Z). Thus, such conjunctions are generally not intended to imply that certain embodiments require at least one of X, at least one of Y, and at least one of Z to be present individually, unless otherwise indicated.
Although only a few embodiments have been described in detail in this disclosure, those skilled in the art who review this disclosure will readily appreciate that many modifications are possible (e.g., variations in sizes, dimensions, structures, shapes and proportions of the various elements, values of parameters, mounting arrangements, use of materials, colors, orientations, etc.) without materially departing from the novel teachings and advantages of the subject matter described herein. For example, elements shown as integrally formed may be constructed of multiple parts or elements, the position of elements may be reversed or otherwise varied, and the nature or number of discrete elements or positions may be altered or varied. The order or sequence of any method processes may be varied or re-sequenced according to alternative embodiments. Other substitutions, modifications, changes and omissions may also be made in the design, operating conditions and arrangement of the various exemplary embodiments without departing from the scope of the present inventions.
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