CN111720581B - Vacuum pump exhaust reed valve with pressure relief - Google Patents
Vacuum pump exhaust reed valve with pressure relief Download PDFInfo
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- CN111720581B CN111720581B CN202010176929.5A CN202010176929A CN111720581B CN 111720581 B CN111720581 B CN 111720581B CN 202010176929 A CN202010176929 A CN 202010176929A CN 111720581 B CN111720581 B CN 111720581B
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K7/00—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves
- F16K7/18—Diaphragm valves or cut-off apparatus, e.g. with a member deformed, but not moved bodily, to close the passage ; Pinch valves with diaphragm secured at one side only, e.g. to be laid on the seat by rolling action
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B39/00—Component parts, details, or accessories, of pumps or pumping systems specially adapted for elastic fluids, not otherwise provided for in, or of interest apart from, groups F04B25/00 - F04B37/00
- F04B39/10—Adaptations or arrangements of distribution members
- F04B39/1073—Adaptations or arrangements of distribution members the members being reed valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C29/00—Component parts, details or accessories of pumps or pumping installations, not provided for in groups F04C18/00 - F04C28/00
- F04C29/12—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet
- F04C29/124—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps
- F04C29/126—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type
- F04C29/128—Arrangements for admission or discharge of the working fluid, e.g. constructional features of the inlet or outlet with inlet and outlet valves specially adapted for rotary or oscillating piston pumps of the non-return type of the elastic type, e.g. reed valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C18/00—Rotary-piston pumps specially adapted for elastic fluids
- F04C18/30—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members
- F04C18/34—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members
- F04C18/344—Rotary-piston pumps specially adapted for elastic fluids having the characteristics covered by two or more of groups F04C18/02, F04C18/08, F04C18/22, F04C18/24, F04C18/48, or having the characteristics covered by one of these groups together with some other type of movement between co-operating members having the movement defined in group F04C18/08 or F04C18/22 and relative reciprocation between the co-operating members with vanes reciprocating with respect to the inner member
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C25/00—Adaptations of pumps for special use of pumps for elastic fluids
- F04C25/02—Adaptations of pumps for special use of pumps for elastic fluids for producing high vacuum
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04C—ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; ROTARY-PISTON, OR OSCILLATING-PISTON, POSITIVE-DISPLACEMENT PUMPS
- F04C28/00—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids
- F04C28/24—Control of, monitoring of, or safety arrangements for, pumps or pumping installations specially adapted for elastic fluids characterised by using valves controlling pressure or flow rate, e.g. discharge valves or unloading valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K15/00—Check valves
- F16K15/14—Check valves with flexible valve members
- F16K15/16—Check valves with flexible valve members with tongue-shaped laminae
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K39/00—Devices for relieving the pressure on the sealing faces
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F16—ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVE FUNCTIONING OF MACHINES OR INSTALLATIONS; THERMAL INSULATION IN GENERAL
- F16K—VALVES; TAPS; COCKS; ACTUATING-FLOATS; DEVICES FOR VENTING OR AERATING
- F16K51/00—Other details not peculiar to particular types of valves or cut-off apparatus
- F16K51/02—Other details not peculiar to particular types of valves or cut-off apparatus specially adapted for high-vacuum installations
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- Engineering & Computer Science (AREA)
- General Engineering & Computer Science (AREA)
- Mechanical Engineering (AREA)
- Physics & Mathematics (AREA)
- Fluid Mechanics (AREA)
- Applications Or Details Of Rotary Compressors (AREA)
Abstract
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.
Description
Cross Reference to Related Applications
This application claims priority to U.S. provisional application No. 62/822,330, filed on 22/3/2019, the contents of which are hereby incorporated by reference in their entirety.
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 accessories, operate pneumatics, position dampers (e.g., exhaust dampers), operate valves (e.g., EGR valves), switch intake manifolds, 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 overload conditions 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 pressurised liquid and/or vapour to escape therethrough when the vacuum pump is not operating, and the aperture is sized to prevent pressurised liquid and/or vapour from escaping therethrough at a rate so as to prevent a vacuum from being generated 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, thereby 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 type 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 eliminate the discharge reed altogether, resulting in a pulsating 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 vane vacuum pump 100. The vane vacuum pump 100 is rigidly coupled to the internal combustion engine such that the vane vacuum pump 100 generates a sufficient vacuum within the internal combustion engine. The vane vacuum pump 100 includes a chamber 102, a rotor 104, vanes 106, an inlet 108, a chamber sealing surface 110, and an exhaust outlet (not shown) that is blocked by the rotor 104. For illustrative purposes, the vane vacuum pump 100 is shown without a cover. In operation, the vane vacuum pump 100 includes a lid coupled to the chamber sealing surface 110 to seal the chamber 102.
The rotor 104 is rotatably coupled to the chamber 102 and rigidly coupled to the vanes 106. The rotor 104 functions to rotate within the chamber 102 such that the blades 106 rotate within the chamber 102. The rotor 104 is also rigidly coupled to a camshaft of the internal combustion engine such that when the camshaft rotates, the rotor 104 also rotates.
The blades 106 are rigidly coupled to the rotor 104 such that the blades 106 rotate as the rotor 104 rotates. The function of the vane 106 is to form a seal against the chamber 102 so that liquid and/or steam cannot escape from the sealed area as the vane 106 rotates. In some embodiments, the vane 106 forms two seals against the chamber 102, wherein the two seals are diametrically opposite one another. In other embodiments, the vane 106 forms more than two seals against the chamber 102, each seal being substantially equally spaced from the other seals. In some embodiments, the vane 106 includes an additional sealing surface that functions to form a seal against the chamber 102. In other embodiments, the vane 106 forms a seal against the chamber 102 without additional sealing surfaces.
The inlet 108 is defined by an opening within the chamber 102. The function of the inlet 108 is to allow liquid and/or vapor (e.g., gas and/or oil) from the internal combustion engine to enter the chamber 102. As the vanes 106 rotate within the chamber 102, liquid and/or vapor occupies the space between the sealing surfaces of the vanes 106. As the blades 106 continue to rotate, the trapped liquid and/or vapor rotates between the sealing surfaces. As one of the sealing surfaces passes through the outlet, liquid and/or vapor exits the vacuum pump 100 through the exhaust outlet, thereby creating a vacuum.
Fig. 2 is a rear perspective view of the conventional vane vacuum pump 100 of fig. 1. The vane vacuum pump 100 is also shown to include an exhaust reed valve 124, a reed valve sealing surface 126, and a reed valve connector 128.
The function of the exhaust reed valve 124 is to cover the outlet to maintain the vacuum pressure in the vane vacuum pump 100 during operation and to reduce parasitic losses (parasitic losses) when a vacuum is generated. When an internal combustion engine system (e.g., a brake assist system) requiring the vane vacuum pump 100 is operating, the vane vacuum pump 100 operates. The exhaust reed valve 124 stops the vane vacuum pump 100 by maintaining the pressure in the vane vacuum pump 100 when the system of the vane vacuum pump 100 is required to stop. Thus, parasitic losses associated with the continued operation of the vane vacuum pump 100 are reduced. Furthermore, by maintaining the vacuum pressure in the vane vacuum pump 100, the discharge reed valve 124 prevents pumping loss.
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 further includes a connecting portion 130, a stem 132, and a body 134. The connecting portion 130 is rigidly coupled to the vane vacuum pump 100 by the reed valve connector 128. The reed valve connector 128 is rigidly coupled to both the connection portion 130 and the vane vacuum pump 100 such that the connection portion 130 cannot move relative to the vane vacuum pump 100. The purpose of the rod 132 is to rigidly connect the connecting portion 130 to the body 134. Generally, the width of the stem 132 is less than the width of both the connecting portion 130 and the body 134. As such, the stem 132 is generally more flexible than the body 134.
The body 134 is rigidly coupled to the stem 132 and functions to cover the reed valve sealing surface 126 such that a seal is formed between the body 134 and the sealing surface 126. In some embodiments, body 134 includes a racetrack shape (e.g., a rectangle with a semi-circle at each of the opposite ends of the rectangle). The body 134 may also include various other shapes (e.g., oval, circular, etc.). When the liquid and/or vapor within the chamber 102 reaches a sufficient pressure and reaches the outlet, the liquid and/or vapor pushes against the body 134. When the liquid and/or vapor pushes on the body 134, the force of the liquid and/or vapor is transferred to the rod 132 such that the rod 132 undergoes elastic deformation and the seal between the body 134 and the sealing surface 126 is broken, thereby allowing the liquid and/or vapor to exit the chamber 102 via the outlet.
As previously described, in many conventional systems, the exhaust reed valve 124 maintains the vacuum pressure in the vane vacuum pump 100 when the engine is shut down. The pressure remains in the vane vacuum pump 100 and cannot be dissipated, with the result that oil from the lubrication system of the internal combustion engine is sucked into the vane vacuum pump 100, which may lead to hydraulic locking.
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 vane vacuum pump 100. The groove 308 may be located anywhere along the sealing surface 302. In some embodiments, a plurality of grooves 308 may be distributed around the sealing surface 302 to provide desired results. In embodiments implementing multiple grooves 308, the size and shape of the grooves 308 may be varied to produce desired results.
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 vane vacuum pump 100 is relieved through the space between the exhaust reed valve 124 and the groove 308, allowing the pressure within the vacuum pump to bleed off when the engine is shut down and allowing sufficient crankcase gas to refill the pump before excess oil is drawn into the vacuum pump when the engine is shut down, helping to prevent hydraulic lock and large loads on the chain. The pressure equalization time is related to the size of the recess 308. For example, a smaller groove 308 will take longer to equalize pressure than a larger groove 308.
Figure 4 is an illustration of a vane vacuum pump 400 according to a particular embodiment, the vane vacuum pump 400 including an exhaust reed valve 402 with a bleed orifice 404. The vane vacuum pump 400 is substantially identical to the vane vacuum pump 100 of FIG. 1, except that a bleed orifice 404 is included in the exhaust reed valve 402. In some embodiments, the bleed aperture 404 is defined by a cylindrical cutout that extends completely through the discharge reed valve 402. In other embodiments, the bleed aperture 404 may not be cylindrical in shape (e.g., square, rectangular, etc.). In some embodiments, the bleed aperture 404 has a constant cross-sectional shape. In other embodiments, the cross-sectional shape of the bleed aperture 404 may vary (e.g., variations in shape, size, etc.). In some arrangements, the bleed aperture 404 has a circular shape with a diameter of approximately 0.5 mm. In other arrangements, the bleed aperture 404 may be larger or smaller to produce the desired result. The pressure equalization time is related to the size of the bleed orifice 404. For example, a smaller bleed aperture 404 will take longer to equalize pressure than a larger bleed aperture 404.
The bleed hole 404 may be located anywhere on the exhaust reed valve 402 such that the bleed hole 404 is in fluid communication with the vane vacuum pump 100. In some embodiments, a single bleed aperture 404 is used. In other embodiments, multiple bleed holes 404 may be used to produce the desired result.
Example of operation of discharge reed valve System
Referring to fig. 1-2, an internal combustion engine includes a vane vacuum pump 100. The vane vacuum pump 100 acts to maintain a vacuum in the internal combustion engine as the rotor 104 rotates the vanes 106 within the chamber 102. To avoid the potential adverse effects of using the discharge reed valve 124 without any improvement (e.g., pressure maintenance in the vacuum pump leading to oil retention (oil failure) and potential failure), the discharge reed valve system is improved to prevent such adverse effects.
Referring to fig. 1-4, adverse effects may be eliminated by modifying the sealing surface 126 to form a reed valve seal 300 that mates with the discharge reed valve 124. During normal engine operation, the vane vacuum pump 100 operates normally, wherein the vanes 106 rotate and create a vacuum for the internal combustion engine. The rotation of the blades 106 causes liquid and/or vapor within the chamber 102 to be expelled through the outlet. When the liquid and/or vapor is vented, the vent reed valve 124 deflects to break the seal between the vent reed valve 124 and the sealing surface 302, thereby allowing the liquid and/or vapor to escape.
When the internal combustion engine is shut down, the vane vacuum pump 100 is also shut down so that the chamber 102 remains pressurized. However, the groove 308 provides an unsealed space between the discharge reed valve 124 and the sealing surface 302 through which liquid and/or vapor may slowly escape, thereby slowly relieving pressure from the vane vacuum pump 100 to significantly reduce the pressure within the chamber 102. Furthermore, by slowly bleeding pressure from the vane vacuum pump 100, the amount of oil carry-over is significantly reduced compared to a pump without the exhaust reed valve 124.
Referring to fig. 1, 2 and 4, adverse effects may also be eliminated by modifying the discharge reed valve 124 to form the discharge reed valve 402. As previously described, the chamber 102 remains pressurized after the internal combustion engine is shut down. However, the aperture 404 provides an unsealed space extending through the exhaust reed valve 402 through which liquid and/or vapor may slowly escape, thereby slowly relieving pressure from the vane vacuum pump 100 to significantly reduce the pressure within the chamber 102. Furthermore, by slowly bleeding pressure from the vane vacuum pump 100, the amount of oil carry-over is significantly reduced compared to a pump without the bleed reed valve 402.
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 members being integrally formed as a single unitary body with one another or with the two members and any additional intermediate members being integrally formed as a single unitary body with one another, with the two members being attached to one another, or with the two members and any additional intermediate members being attached to one another.
It should be noted that the construction and arrangement of the systems illustrated 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.
Claims (20)
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, the groove defined by a slot within 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 and a groove, wherein the groove is defined by a slot in the sealing surface; 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 when the vacuum pump is operating, thereby preventing a vacuum from being created.
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, the groove defined by a slot within 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, 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 when the vacuum pump is operating, thereby preventing a vacuum from being created.
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.
Applications Claiming Priority (4)
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US201962822330P | 2019-03-22 | 2019-03-22 | |
US62/822,330 | 2019-03-22 | ||
GB2003376.7 | 2020-03-09 | ||
GB2003376.7A GB2584005B (en) | 2019-03-22 | 2020-03-09 | Vacuum pump exhaust reed valve with pressure bleed |
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CN111720581A CN111720581A (en) | 2020-09-29 |
CN111720581B true CN111720581B (en) | 2022-06-10 |
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CN202010176929.5A Active CN111720581B (en) | 2019-03-22 | 2020-03-13 | Vacuum pump exhaust reed valve with pressure relief |
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CN (1) | CN111720581B (en) |
GB (1) | GB2584005B (en) |
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Also Published As
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GB202003376D0 (en) | 2020-04-22 |
GB2584005B (en) | 2022-11-23 |
CN111720581A (en) | 2020-09-29 |
GB2584005A (en) | 2020-11-18 |
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