CN220082223U

CN220082223U - Pressure reducing valve

Info

Publication number: CN220082223U
Application number: CN202321382115.2U
Authority: CN
Inventors: 刘仁豪; 孟令宇; 孙维福
Original assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Current assignee: Beijing Meike Tianma Automation Technology Co Ltd; Beijing Tianma Intelligent Control Technology Co Ltd
Priority date: 2023-06-01
Filing date: 2023-06-01
Publication date: 2023-11-24
Anticipated expiration: 2033-06-01

Abstract

The utility model discloses a pressure reducing valve, which comprises a shell, a valve rod, a push rod, a first elastic component and a second elastic component, wherein an inner cavity, an inlet and an outlet are formed in the shell; the valve rod is assembled in the first cavity, the ejector rod is assembled in the second cavity, the ejector rod is in stop contact with the valve rod and penetrates through the flow hole, the valve rod can reciprocate along the axial direction of the flow hole to adjust the flow area of the flow hole, the first elastic component is assembled in the first cavity and used for applying acting force towards the ejector rod to the valve rod, and the second elastic component is assembled in the second cavity and used for applying acting force towards the valve rod to the ejector rod. The pressure reducing valve has the advantages of large output flow, strong impact resistance of the valve core and long service life.

Description

Pressure reducing valve

Technical Field

The utility model relates to the technical field of pressure reduction, in particular to a pressure reducing valve.

Background

The fuel cell can directly convert chemical energy into electric energy, and has the advantages of high energy conversion efficiency, small pollution, wide fuel source, low noise, high reliability, convenient maintenance and the like. Currently, a vehicle-mounted hydrogen storage system of a fuel cell is generally composed of a high-pressure gas cylinder, a pressure reducing valve, a safety valve, a pressure sensor and the like.

The pressure reducing valve is a key part of the vehicle-mounted hydrogen storage system, and the stability, the output pressure precision and the service life of the output pressure of the pressure reducing valve play an important role in the reliable operation of a downstream fuel cell system. However, the pressure reducing valve in the related art has the problems of low output flow, incapability of meeting high-pressure impact by a valve core, low service life, low integration level, poor sealing reliability and the like.

Disclosure of Invention

The present utility model aims to solve at least one of the technical problems in the related art to some extent.

Therefore, the embodiment of the utility model provides the pressure reducing valve which has the advantages of large output flow, strong impact resistance of the valve core, long service life, high integration level and good sealing reliability.

The pressure reducing valve of the embodiment of the utility model comprises:

the shell is internally provided with an inner cavity, an inlet and an outlet;

the valve is arranged in the inner cavity and divides the inner cavity into a first cavity and a second cavity, an overflow hole which is communicated with the first cavity and the second cavity is formed in the valve, the inlet is communicated with the first cavity, and the outlet is communicated with the second cavity;

the valve rod is assembled in the first cavity, the ejector rod is assembled in the second cavity, the ejector rod is in stop contact with the valve rod and penetrates through the overflow hole, and the valve rod can reciprocate along the axial direction of the overflow hole so as to adjust the flow area of the overflow hole;

the valve comprises a first elastic component and a second elastic component, wherein the first elastic component is assembled in the first cavity and used for applying force towards the ejector rod to the valve rod, and the second elastic component is assembled in the second cavity and used for applying force towards the valve rod to the ejector rod.

The pressure reducing valve provided by the embodiment of the utility model has the advantages of large output flow, strong impact resistance of the valve core and long service life.

In some embodiments, the pressure reducing valve comprises a screw cap which is threadedly mounted in the second cavity and is used for pressing the valve between the first cavity and the second cavity, a mounting cavity is arranged in the screw cap, and the ejector rod is matched in the mounting cavity of the screw cap.

In some embodiments, a communication hole is provided in the nut, the communication hole communicating the fitting chamber with the outlet.

In some embodiments, the first elastic assembly comprises:

the first sealing ring is sleeved on the outer peripheral side of the valve rod to realize sealing between the valve rod and the cavity wall of the first cavity;

the baffle is arranged on one side of the first sealing ring, facing the second cavity, and used for pressing and fixing the first sealing ring, and the valve rod penetrates through the baffle;

the first elastic piece is sleeved on the outer peripheral side of the valve rod, one end of the first elastic piece is abutted against the baffle, and the other end of the first elastic piece is abutted against the valve rod.

In some embodiments, the second elastic assembly comprises:

the piston can be assembled in the second cavity in a reciprocating manner, and the piston is used for stopping the ejector rod;

the seat body is arranged in the second cavity, and the second elastic piece is elastically stopped between the piston and the seat body;

the adjusting piece is assembled on the shell and is adjustable in position relative to the shell, and the adjusting piece is used for adjusting the position of the seat body so as to realize the adjustment of the compression amount of the second elastic piece;

and the locking plug is fixed to the shell and used for blocking the adjusting piece in the shell.

In some embodiments, a second sealing ring is embedded on the outer peripheral side of the piston, the second sealing ring is used for sealing and plugging a gap between the piston and a cavity wall of the second cavity, and the first sealing ring and the second sealing ring are both U-shaped rings or spring energy storage rings.

In some embodiments, the pressure relief valve includes a filter disposed at the inlet and configured to filter fluid entering via the inlet.

In some embodiments, the pressure reducing valve comprises a safety valve, the safety valve is arranged on the side, away from the second cavity, of the first cavity, and a through hole for communicating the safety valve with the outlet is formed in the shell.

In some embodiments, the pressure relief valve includes a relief valve disposed in the housing and in communication with the first chamber, and a sensor interface disposed on the housing, the sensor interface disposed opposite the relief valve.

In some embodiments, the pressure relief valve includes a waterproof and breathable membrane disposed on the housing and on a peripheral side of the second chamber.

Drawings

Fig. 1 is an external view schematically showing a pressure reducing valve according to an embodiment of the present utility model.

Fig. 2 is a schematic cross-sectional view of a pressure reducing valve according to an embodiment of the present utility model.

Fig. 3 is a schematic perspective view of the ejector pin of fig. 2.

Reference numerals:

a housing 100;

a valve cover 1;

a valve body 2; an inlet 21; a sensor interface 22; an outlet 23; a through hole 24;

a shutter 3;

a valve stem 4;

a push rod 5; a first column section 51;

a nut 6; a communication hole 61; a fitting chamber 62;

a first elastic member 7; a baffle 71; a first seal ring 72; a first elastic member 73;

a second elastic component 8; a piston 81; a second seal ring 811; a third seal ring 812; a fourth seal ring 813; a second elastic member 82; a base 83; an adjustment member 84; a locking plug 85;

a safety valve 200;

a relief valve 300;

a filter 400;

a waterproof breathable membrane 500.

Detailed Description

Reference will now be made in detail to embodiments of the present utility model, examples of which are illustrated in the accompanying drawings. The embodiments described below by referring to the drawings are illustrative and intended to explain the present utility model and should not be construed as limiting the utility model.

As shown in fig. 1 and 2, the pressure reducing valve of the embodiment of the present utility model includes a housing 100, a shutter 3, a valve stem 4, a jack 5, a first elastic member 7 and a second elastic member 8.

The housing 100 has an interior cavity, an inlet 21 and an outlet 23. For example, the housing 100 may be provided separately and may include a valve body 2 and a valve cover 1, wherein the valve cover 1 may be assembled above the valve body 2 by screwing. The inner cavity is a space surrounded by the valve body 2 and the valve cover 1, the inlet 21 and the outlet 23 can be arranged on the valve body 2, and the inlet 21 and the outlet 23 can be oppositely arranged in the left-right direction, wherein the inlet 21 can be positioned on the right side of the outlet 23.

The valve 3 is arranged in the inner cavity and divides the inner cavity into a first cavity and a second cavity, an overflow hole which is communicated with the first cavity and the second cavity is arranged in the valve 3, the inlet 21 is communicated with the first cavity, and the outlet 23 is communicated with the second cavity.

Specifically, the shutter 3 may be substantially annular, and the material of the shutter 3 may be rubber or the like. A stepped surface may be provided in the inner cavity of the housing 100, and the shutter 3 may be fixed to the stepped surface. In the up-down direction, the shutter 3 may divide the inner cavity of the housing 100 into a first cavity and a second cavity, wherein the first cavity may be located below the second cavity. The inner bore of the shutter 3 forms an overflow aperture through which fluid in the first chamber may flow into the second chamber during use, so that fluid entering through the inlet 21 may flow to the outlet 23. At the valve 3, the valve 3 has a smaller flow area and can play a role in blocking fluid, so that the pressure of the fluid can be reduced.

The valve rod 4 is assembled in the first cavity, the ejector rod 5 is assembled in the second cavity, the ejector rod 5 and the valve rod 4 are in stop contact and pass through the overflow hole, and the valve rod 4 can reciprocate along the axial direction of the overflow hole so as to realize the size adjustment of the flow area of the overflow hole.

For example, as shown in fig. 3, the radial dimension of the middle portion of the stem 5 may be thicker, the radial dimension of the bottom portion of the stem 5 may be thinner and may form the first column section 51, and similarly, the radial dimension of a portion of the middle portion of the stem 4 may be thicker and may be generally conical, and the radial dimension of the top portion of the stem 4 may be thinner and may form the second column section. The first column section 51 and the second column section may each be cylindrical, and the overall length dimension of the first column section 51 and the second column section in the up-down direction is longer than the length dimension of the overflow hole.

When assembled, the ejector pin 5 may be assembled in the second cavity, and the first column section 51 may be inserted into the flow-through hole, and the valve stem 4 may be assembled in the first cavity, and the second column section may also be inserted into the flow-through hole. The radial dimensions of both the first and second column sections 51, 51 are smaller than the aperture of the flow-through aperture so that fluid can flow from the first chamber into the second chamber via the slit.

A first resilient assembly 7 fits within the first cavity and acts to apply a force to the valve stem 4 towards the stem 5, and a second resilient assembly 8 fits within the second cavity and acts to apply a force to the stem 5 towards the stem 4. Specifically, the first elastic component 7 and the second elastic component 8 can both ensure elastic components such as springs, wherein the first elastic component 7 can elastically push the valve rod 4 upwards, the second elastic component 8 can elastically push the ejector rod 5 downwards, and under the action of the first elastic component 7 and the second elastic component 8, the ejector rod 5 and the valve rod 4 can keep abutting contact, so that a force transmission effect is achieved.

In the use process, the valve rod 4 and the ejector rod 5 can move up and down, when the pressure of the inlet 21 is increased, the valve rod 4 can move up under the combined action of the hydraulic pressure and the first elastic component 7, and due to the conical design of a part of the valve rod 4, the gap between the valve rod 4 and the valve 3 can be reduced, so that the flow area can be reduced, the flow resistance can be increased, and the decompression effect can be realized.

When the pressure of the inlet 21 is reduced, the ejector rod 5 pushes the valve rod 4 downwards under the action of the second elastic component 8, and at this time, the gap between the valve rod 4 and the valve 3 is enlarged, so that the flow area can be increased, the flow resistance is reduced, and the situation that the hydraulic pressure at the outlet 23 is smaller is avoided.

According to the pressure reducing valve provided by the embodiment of the utility model, the inlet 21 and the outlet 23 are communicated with the inner cavity, the integral flow passage in the pressure reducing valve is simple in design and small in flow resistance, the output quantity of fluid flowing out through the outlet 23 is ensured, the flow area in the pressure reducing valve can be adaptively adjusted according to the pressure of the fluid, and when the pressure at the inlet 21 is smaller, the flow area is increased, so that the output flow at the outlet 23 is further ensured.

Secondly, compared with the valve core in the prior art, the valve core is arranged in a split mode and comprises the valve rod 4 and the ejector rod 5, so that the problem that part of the valve core needs to be made into a slender structure due to the limitation of the aperture size of the overflow hole in the integral design (the situation that the valve core needs to pass through the overflow hole is considered) is avoided, the valve rod 4 and the ejector rod 5 are not limited by the aperture size of the overflow hole in the integral design, and larger radial size can be adopted, so that the situation that the slender valve core is weak in impact resistance and short in service life is avoided, the failure rate is reduced, and the durability of use is ensured.

In some embodiments, as shown in fig. 2, the pressure reducing valve comprises a screw cap 6, the screw cap 6 may be in a circular ring column shape instead, an external thread is arranged on the outer periphery side of the screw cap 6, an internal thread is arranged on a part of the cavity wall of the second cavity, the screw cap 6 is assembled in the second cavity, and the valve 3 can be pressed and fixed between the screw cap 6 and the step surface, so that the valve 3 is convenient to install and fix. The interior space of the nut 6 forms an assembly cavity 62, the ejector rod 5 can be matched in the assembly cavity 62 of the nut 6, and the ejector rod 5 can move up and down in the assembly cavity 62, so that the assembly compactness of the ejector rod 5 can be improved.

In some embodiments, the nut 6 is provided with a communication hole 61, the communication hole 61 communicating the fitting chamber 62 with the outlet 23. For example, as shown in fig. 2, a plurality of communication holes 61 may be provided, and a plurality of communication holes 61 may be arranged at equal intervals along the circumferential direction of the nut 6. And each of the communication holes 61 may be an inclined hole, that is, the communication hole 61 extends obliquely upward in the inside-out direction.

In use, fluid flowing from the inlet 21 may first flow into the first chamber, then may flow into the fitting chamber 62 via the flow-through holes, then may flow into the second chamber via the respective communication holes 61, and finally may flow to the outlet 23.

In some embodiments, as shown in fig. 2, the first resilient assembly 7 includes a first seal ring 72, a baffle 71, and a first resilient member 73. The first elastic member 73 may be a spring, the first sealing ring 72 is sleeved on the outer peripheral side of the valve rod 4 to achieve sealing between the valve rod 4 and the cavity wall of the first cavity, the baffle 71 is arranged on the upper side of the first sealing ring 72 and is used for pressing and fixing the first sealing ring 72 in the first cavity, the valve rod 4 passes through the baffle 71, the first elastic member 73 is sleeved on the outer peripheral side of the valve rod 4, the bottom end of the first elastic member 73 is abutted against the baffle 71, and the top end of the first elastic member 73 is abutted against the conical portion of the valve rod 4.

Thereby, not only the sealing assembly of the valve rod 4 is realized, but also the restoring force can be provided to the valve rod 4 by the first elastic piece 73, thereby meeting the use requirement.

In some embodiments, as shown in fig. 2, the second elastic assembly 8 includes a piston 81, a seat 83, a second elastic member 82, an adjustment member 84, and a locking plug 85. The piston 81 is reciprocally mounted in the second chamber, and the piston 81 is adapted to abut against the ram 5, i.e., the piston 81 is mounted in the second chamber and is reciprocally movable in the second chamber in the up-down direction. The circumferential seal may be achieved by the cooperation of the piston 81 and the chamber wall of the second chamber. And the up-and-down movement of the piston 81 satisfies the use requirement of driving the jack 5 to move up and down.

The seat 83 is disposed in the second cavity, and the seat 83 can be slidably assembled with the second cavity in a guiding manner, i.e. the seat 83 can reciprocate up and down in the second cavity. The second elastic member 82 may also be a spring, where the second elastic member 82 may be assembled between the piston 81 and the seat 83, and in use, the second elastic member 82 may push the piston 81 downward, so as to realize downward movement driving of the piston 81.

The adjusting member 84 is assembled to the housing 100 and is adjustable in position relative to the housing 100, and the adjusting member 84 is used for adjusting the position of the seat 83 to adjust the compression amount of the second elastic member 82. For example, the adjusting member 84 may be a screw, the adjusting member 84 may be screwed on the top of the valve cover 1, when in use, the adjusting member 84 may be screwed to adjust the vertical position, when the adjusting member 84 is adjusted downward, the adjusting member 84 may push the seat 83 to move downward, the seat 83 may push the second elastic member 82, so that the precompression amount of the second elastic member 82 may be increased, and when the adjusting member 84 moves upward, the precompression amount of the second elastic member 82 may be reduced. The provision of the adjustment member 84 facilitates adjustment of the predetermined spring force of the second spring member 82 to meet different pressure relief use requirements.

The locking plug 85 is secured to the housing 100 and is used to seal the adjuster 84 within the housing 100. For example, the locking plug 85 may be a screw plug, and the locking plug 85 may be screwed on the top of the valve cover 1, and the locking plug 85 may serve to block the adjuster 84 on the one hand, and may serve to seal on the other hand.

In some embodiments, as shown in fig. 2, a second sealing ring 811 is embedded on the outer peripheral side of the piston 81, a ring groove may be formed on the peripheral side of the piston 81, the second sealing ring 811 may be embedded in the ring groove, the second sealing ring 811 is used for sealing and plugging a gap between the piston 81 and a cavity wall of the second cavity, and the first sealing ring 72 and the second sealing ring 811 are both U-shaped rings (the cross section is U-shaped) or spring energy storage rings, so that the sealing service life and the sealing reliability are fully ensured.

In other embodiments, as shown in fig. 2, a third sealing ring 812 may be further provided on the circumferential side of the piston 81, so that the sealing between the piston 81 and the chamber wall of the second chamber may be further improved.

In some embodiments, as shown in fig. 2, the top of the valve body 2 may be in a plug-in fit in the valve cover 1, and the top end surface of the valve body 2 may be provided with a fourth sealing ring 813, where the fourth sealing ring 813 may be pressed between the valve body 2 and the valve cover 1, so as to ensure tightness of assembly between the valve body 2 and the valve cover 1.

In some embodiments, as shown in fig. 2, the pressure reducing valve includes a filter 400, and the filter 400 is provided at the inlet 21 and is used to filter the fluid entering through the inlet 21, thereby avoiding the situation that the valve rod 4, the ejector rod 5, the valve 3, etc. are easily damaged by impurities, further ensuring the reliability of use and prolonging the service life.

In some embodiments, the pressure reducing valve includes a relief valve 200, the relief valve 200 is disposed on the side of the housing 100 facing away from the second chamber, and a through hole 24 is disposed in the housing 100 to communicate the relief valve 200 with the outlet 23.

For example, as shown in fig. 1 and 2, the safety valve 200 may be assembled at the bottom of the valve body 2, a through hole 24 may be provided in the valve body 2, the through hole 24 may extend generally in the upper left to lower right direction, and the left end of the through hole 24 may communicate with the outlet 23, and the right end of the through hole 24 may communicate with the safety valve 200. When the pressure of the fluid at the outlet 23 is large, the relief valve 200 may be opened, thereby functioning as a guard.

In some embodiments, as shown in fig. 1, the relief valve includes a relief valve 300, and the relief valve 300 may be installed at a rear side of the valve body 2, the relief valve 300 being provided to the housing 100 and communicating with the first chamber, the relief valve 300 serving to relieve pressure at front and rear ends of the relief valve when the vehicle is serviced, thereby functioning to prevent a pressurized operation. And the sensor interface 22 is arranged on the shell 100, and the sensor interface 22 and the relief valve 300 are oppositely arranged, so that the pressure sensor and the like can be conveniently installed on the pressure reducing valve, and the visual monitoring of the pressure reducing valve is facilitated.

In some embodiments, the pressure relief valve includes a waterproof and breathable membrane 500, the waterproof and breathable membrane 500 being provided to the housing 100 and located on the outer peripheral side of the second chamber. For example, as shown in fig. 2, the waterproof and breathable membrane 500 may be installed on the valve cover 1, and the waterproof and breathable membrane 500 may communicate the space between the piston 81 and the seat 83 with the outside, so that the inflow and outflow of gas are facilitated, and thus the pressure effect in the moving process of the piston 81 can be balanced, the movement of the piston 81 is facilitated, and the waterproof and airtight property is ensured.

While the above embodiments have been shown and described, it should be understood that the above embodiments are illustrative and not to be construed as limiting the utility model, and that variations, modifications, alternatives, and variations of the above embodiments may be made by those of ordinary skill in the art without departing from the scope of the utility model.

Claims

1. A pressure relief valve, comprising:

the shell is internally provided with an inner cavity, an inlet and an outlet;

2. The pressure reducing valve according to claim 1, comprising a screw cap threadedly fitted in the second chamber for press-fastening the shutter between the first chamber and the second chamber, a fitting chamber being provided in the screw cap, and the ejector pin being fitted in the fitting chamber of the screw cap.

3. A pressure reducing valve according to claim 2, wherein the nut is provided with a communication hole which communicates the fitting chamber with the outlet.

4. The pressure relief valve of claim 1, wherein said first resilient assembly comprises:

5. The pressure relief valve of claim 4, wherein said second resilient assembly comprises:

6. The pressure reducing valve according to claim 5, wherein a second sealing ring is embedded on the outer peripheral side of the piston, the second sealing ring is used for sealing and plugging a gap between the piston and a cavity wall of the second cavity, and the first sealing ring and the second sealing ring are both U-shaped rings or spring energy storage rings.

7. The pressure relief valve of claim 1, comprising a filter disposed at the inlet and adapted to filter fluid entering via the inlet.

8. The pressure reducing valve according to claim 1, comprising a relief valve provided in the housing on a side of the first chamber facing away from the second chamber, and a through hole communicating the relief valve with the outlet is provided in the housing.

9. The pressure relief valve of claim 1, comprising a relief valve disposed in the housing and in communication with the first chamber, and a sensor interface disposed on the housing, the sensor interface being disposed opposite the relief valve.

10. The pressure reducing valve according to any one of claims 1 to 9, comprising a waterproof and breathable film provided to the housing on an outer peripheral side of the second chamber.