Buffer module and pressure reducing valve

Abstract

This invention discloses a buffer module and a pressure reducing valve, comprising a carrier, a movable component, and a reset component. The carrier has a mounting cavity, an inlet, and an outlet, with the mounting cavity connecting the inlet and outlet. The movable component has a first channel and a second channel, which intersect and connect with the first channel. The movable component is disposed within the mounting cavity and divides the mounting cavity into a first cavity and a second cavity. The first channel connects with the first cavity. The movable component is slidable relative to the carrier and has a closed position and an open position. A pre-set gap between the movable component and the carrier, communicating with the second channel, is provided. The reset component is disposed in the second cavity and is used to apply an elastic force to the movable component. The buffer module of this invention can mitigate the impact on the sensitive elements and sealing structure of the pressure reducing valve when high-pressure, high-speed hydrogen gas transiently enters the pressure reducing valve, achieving a slow increase in pressure at the inlet and outlet of the pressure reducing valve, thus protecting the pressure reducing valve and the downstream fuel cell stack.

Description

Technical Field

[0001] This invention relates to the field of pressure reduction technology, and more specifically, to a buffer module and a pressure reducing valve including the buffer module. Background Technology

[0002] The pressure reducing valve is a key component of an on-board hydrogen storage system, primarily used to regulate the stability and accuracy of the output pressure, ensuring the reliable operation of the hydrogen fuel cell. However, in related technologies, the opening and closing of the hydrogen cylinder in an on-board hydrogen storage system is often controlled by a solenoid valve with a response time in the millisecond range. When the solenoid valve opens, high-pressure hydrogen gas (35MPa or 70MPa) from the on-board hydrogen storage cylinder flows out at high speed to the pressure reducing valve. Due to the inherent response time of the pressure reducing valve, the huge high-pressure gas impact generated by the opening of the solenoid valve can easily damage the sensitive components inside the pressure reducing valve. Secondly, it can also cause a transient increase in the pressure at the outlet of the pressure reducing valve, which can affect the downstream pipelines and even damage the downstream fuel cell stack, reducing the safety of the on-board hydrogen storage system. Summary of the Invention

[0003] The present invention aims to at least partially solve one of the technical problems in the related art.

[0004] To address this, this invention proposes a buffer module that can mitigate the impact on the sensitive elements and sealing structure of the pressure reducing valve caused by the transient flow of high-pressure, high-speed hydrogen gas. This module achieves a slow increase in pressure at the inlet and outlet of the pressure reducing valve, thus protecting the pressure reducing valve and the downstream fuel cell stack.

[0005] The present invention also proposes a pressure reducing valve including the above-mentioned buffer module.

[0006] The buffer module of this embodiment of the invention includes:

[0007] A carrier having an installation cavity, an inlet, and an outlet, the installation cavity being connected between the inlet and the outlet;

[0008] A movable component is provided with a first channel and a second channel, the second channel and the first channel intersect and communicate with each other, the movable component is disposed in the mounting cavity and divides the mounting cavity into a first cavity and a second cavity, the first channel communicates with the first cavity, the movable component is slidable relative to the carrier and has a closed position and an open position, in the closed position the movable component blocks at least one of the inlet and the outlet, in the open position the second channel communicates between the inlet and the outlet;

[0009] A gap communicating with the second channel is preset between the movable component and the carrier. In the closed position, the gap, the second channel, and the first channel form a flow channel for the inlet fluid to flow into the first cavity so that the movable component is switched to the open position by the pressure of the fluid.

[0010] A reset member is disposed in the second cavity, and the reset member is used to apply an elastic force to the movable member to reset the movable member to the closed position when no fluid flows into the inlet.

[0011] The buffer module of this invention can mitigate the impact on the sensitive elements and sealing structure of the pressure reducing valve when high-pressure, high-speed hydrogen gas transiently enters the pressure reducing valve, thereby achieving a slow increase in pressure at the inlet and outlet of the pressure reducing valve and protecting the pressure reducing valve and downstream fuel cell stack.

[0012] In some embodiments, the inlet and the outlet are arranged coaxially, and an annular groove is provided on the inner wall of the mounting cavity. The inlet and the outlet are located on the same side of the annular groove and are both in communication with the annular groove. The annular groove surrounds the outer periphery of the movable member and forms the gap.

[0013] In some embodiments, the movable member is provided with a first throttling orifice and a second throttling orifice, the first channel is connected between the first throttling orifice and the second throttling orifice, the first throttling orifice and the second throttling orifice form the second channel, and in the open position, the first throttling orifice is connected to the inlet, and the second throttling orifice is connected to the outlet.

[0014] In some embodiments, the diameter of at least a portion of the first throttling orifice gradually decreases along the direction close to the first channel, and / or, the diameter of at least a portion of the second throttling orifice gradually decreases along the direction close to the first channel.

[0015] In some embodiments, the movable member is provided with an assembly hole that communicates with the second cavity and extends along the sliding direction of the movable member, with at least a portion of the reset member fitting within the assembly hole.

[0016] In some embodiments, the buffer module includes a mounting base and a sleeve, the sleeve being fitted into the second cavity, the mounting base being fixed within the sleeve, one end of the reset member being in abutment contact with the movable member, the other end of the reset member being located within the sleeve and in abutment contact with the mounting base, and a portion of the mounting base extending into the reset member.

[0017] In some embodiments, the inner diameter of the sleeve is smaller than the outer diameter of the movable member, and a stepped surface is formed between the sleeve and the cavity wall of the mounting cavity, wherein in the open position, the stepped surface makes a stop contact with the movable member.

[0018] In some embodiments, the buffer module includes a first seal and a second seal. The first seal is embedded in the cavity wall of the mounting cavity and surrounds the outer periphery of the movable member to seal the first cavity. The second seal is embedded in the cavity wall of the mounting cavity and surrounds the outer periphery of the movable member to seal the second cavity.

[0019] In some embodiments, the cushioning module includes an elastically deformable sealing gasket installed within the first cavity, the sealing gasket being used to cushion the impact of the moving part.

[0020] The pressure reducing valve of this invention includes a valve body and a buffer module as described in any of the above embodiments. The valve body includes a housing and a valve assembly. The housing is provided with a valve inlet. The carrier is integrally formed on the housing, and the buffer module is located between the valve assembly and the valve inlet. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of the arrangement of the buffer module according to an embodiment of the present invention.

[0022] Figure 2 yes Figure 1 A schematic diagram of the active component of the buffer module in the open position.

[0023] Figure 3 yes Figure 1 A schematic diagram of the active component of the buffer module in the closed position.

[0024] Figure 4 This is a schematic diagram of the outer side of the pressure reducing valve according to an embodiment of the present invention.

[0025] Figure 5 This is a cross-sectional schematic diagram of the pressure reducing valve according to an embodiment of the present invention.

[0026] Figure label:

[0027] Buffer module 100;

[0028] Carrier 11; Mounting cavity 111; First cavity 1111; Second cavity 1112; Inlet 112; Outlet 113;

[0029] Movable part 12; Second channel 121; First throttling orifice 1211; Second throttling orifice 1212; First channel 122; Annular groove 123; Assembly hole 124;

[0030] Reset component 13;

[0031] Body 14; Step surface 141;

[0032] Mounting bracket 15;

[0033] First seal 16;

[0034] Second seal 17;

[0035] Sealing gasket 18;

[0036] Clamping screw 19;

[0037] Casing 200;

[0038] Valve cover 21;

[0039] Valve body 22; Valve inlet 221; Sensor interface 222; Valve outlet 223; Through hole 224;

[0040] Fault door 23;

[0041] Valve stem 24;

[0042] Top rod 25; First column segment 251;

[0043] Nut 26; Connecting hole 261; Assembly cavity 262;

[0044] First elastic component 27; baffle 271; first sealing ring 272; first elastic element 273;

[0045] Second elastic component 28; piston 281; second sealing ring 2811; third sealing ring 2812; fourth sealing ring 2813; second elastic element 282; seat 283; adjusting element 284; locking plug 285;

[0046] Safety valve 300;

[0047] 400 relief valve;

[0048] Filter 500;

[0049] Waterproof and breathable membrane 600. Detailed Implementation

[0050] Embodiments of the present invention are described in detail below, examples of which are illustrated in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0051] like Figures 1 to 3 As shown, the buffer module 100 of this embodiment of the invention includes a carrier 11, a movable component 12, and a reset component 13.

[0052] The carrier 11 serves as the outer shell of the buffer module 100. The carrier 11 can be independently installed, in which case the buffer module 100 is a modular single component. The pressure reducing valve can be provided with mounting holes for installing the buffer module 100. In use, the buffer module 100 can be directly inserted into the corresponding mounting holes. In other embodiments, the carrier 11 of the buffer module 100 can also be integrated into the housing 200 of the pressure reducing valve. This reduces the overall number of components and achieves an integrated design of the buffer module 100 and the pressure reducing valve.

[0053] The carrier 11 has an installation cavity 111, an inlet 112, and an outlet 113, with the installation cavity 111 connecting the inlet 112 and the outlet 113. For example, Figure 2 and Figure 3 As shown, the carrier 11 has a shell-like structure. The mounting cavity 111 is the internal space of the carrier 11. The mounting cavity 111 extends roughly in the vertical direction. The inlet 112 of the carrier 11 can be located on the right side of the mounting cavity 111 and communicate with the mounting cavity 111. The outlet 113 of the carrier 11 can be located on the left side of the mounting cavity 111 and communicate with the mounting cavity 111.

[0054] The movable component 12 is disposed within the mounting cavity 111 and divides the mounting cavity 111 into a first cavity 1111 and a second cavity 1112. For example, the shape of the movable component 12 is adapted to the inner cavity of the mounting cavity 111. The movable component 12 is assembled within the mounting cavity 111 and divides the mounting cavity 111 into a first cavity 1111 and a second cavity 1112 in the vertical direction. Both the first cavity 1111 and the second cavity 1112 are movable cavities, that is, the volume of both the first cavity 1111 and the second cavity 1112 can be adjusted. The first cavity 1111 can be located above the movable component 12, and the second cavity 1112 can be located below the movable component 12.

[0055] The movable component 12 is provided with a first channel 122 and a second channel 121. The second channel 121 and the first channel 122 intersect and communicate with each other. The first channel 122 communicates with the first cavity 1111. For example, the first channel 122 can generally extend along the axial direction (vertical direction) of the movable component 12, and the second channel 121 can extend along the radial direction (left and right direction) of the movable component 12. The top end of the first channel 122 can penetrate the top wall of the movable component 12 and communicate with the first cavity 1111, while the second channel 121 can communicate with the bottom end of the first channel 122.

[0056] During the vertical movement of the movable component 12 relative to the carrier 11, the movable component 12 has a closed position and an open position. For example, as Figure 3As shown, when the movable part 12 moves upward, it can switch to the closed position. At this time, the movable part 12 can completely block the inlet 112 and the outlet 113. In some other embodiments, the inlet 112 and the outlet 113 on the carrier 11 can be staggered. In this case, the movable part 12 can also block one of the inlet 112 and the outlet 113. The movable part 12 can thus impede the flow of fluids such as high-pressure hydrogen.

[0057] like Figure 2 As shown, when the movable part 12 moves downward, it can be switched to the open position. At this time, the left end of the second channel 121 can be connected to the outlet 113 of the carrier 11, and the right end of the second channel 121 can be connected to the inlet 112 of the carrier 11. Thus, high-pressure hydrogen and other fluids can flow through the buffer module 100 via the second channel 121.

[0058] A gap is pre-set between the movable part 12 and the carrier 11 to communicate with the second channel 121. In the closed position, the gap, the second channel 121, and the first channel 122 form a flow channel and are used to allow the fluid from the inlet 112 to flow into the first cavity 1111 so that the movable part 12 is switched to the open position by the pressure of the fluid.

[0059] For example, such as Figure 2 and Figure 3 As shown, the outer peripheral wall of the movable part 12 and / or the cavity wall of the mounting cavity 111 can be made with a variable diameter. When the movable part 12 is switched to the closed position, the gap will connect the second channel 121 and the inlet 112. When high-pressure hydrogen enters the inlet 112 of the carrier 11, the high-pressure hydrogen will flow into the second channel 121 along the gap, and then flow into the first cavity 1111 in sequence through the second channel 121 and the first channel 122. As the amount of high-pressure hydrogen in the first cavity 1111 increases, the pressure in the first cavity 1111 will increase. Under the action of this pressure, the movable part 12 will move down and can be switched to the open position.

[0060] like Figure 2 and Figure 3 As shown, the reset member 13 can be a spring. The reset member 13 is installed in the second cavity 1112. The top end of the reset member 13 can make a stop contact with the bottom of the movable member 12, and the bottom end of the reset member 13 can make a stop contact with the bottom wall of the second cavity 1112. The reset member 13 can continuously apply an upward elastic force to the movable member 12. Under this force, the movable member 12 can always have the tendency to switch to the closed position on its own.

[0061] This allows the movable part 12 to remain in the closed position under normal conditions. When the solenoid valve on the gas cylinder opens instantaneously, the high-pressure hydrogen can be blocked by the movable part 12, thus preventing damage to the internal structure of the pressure reducing valve or the downstream fuel cell stack caused by the high-pressure gas. Then, under the continuous action of the high-pressure hydrogen, the movable part 12 can move down to the open position on its own, thereby enabling the input of high-pressure hydrogen to the fuel cell stack.

[0062] The buffer module 100 of this embodiment of the invention can alleviate the impact on the sensitive elements and sealing structure of the pressure reducing valve when high-pressure and high-speed hydrogen transiently enters the pressure reducing valve, and realizes the slow increase of pressure at the inlet 112 and outlet 113 of the pressure reducing valve, thus protecting the pressure reducing valve and the downstream fuel cell stack.

[0063] In some embodiments, such as Figure 2 and Figure 3 As shown, the inlet 112 and outlet 113 are arranged coaxially. For example, both the inlet 112 and outlet 113 can be circular holes and can extend in the left-right direction, and the axes of the inlet 112 and outlet 113 can be the same axis. An annular groove 123 is provided on the inner wall of the mounting cavity 111. The inlet 112 and outlet 113 are located on the same side of the annular groove 123 and are both connected to the annular groove 123. That is, the annular groove 123 can be located on the upper side of the inlet 112 and outlet 113, and the annular groove 123 surrounds the outer periphery of the movable part 12 and forms a gap.

[0064] This facilitates the formation of gaps and avoids the situation where the structural strength and sealing of the movable part 12 are easily reduced when the diameter of the movable part 12 is changed.

[0065] In some embodiments, such as Figure 2 and Figure 3 As shown, the movable component 12 is provided with a first throttling orifice 1211 and a second throttling orifice 1212. A first channel 122 connects the first throttling orifice 1211 and the second throttling orifice 1212. The first throttling orifice 1211 can be located on the right side of the movable component 12, and the second throttling orifice 1212 can be located on the left side of the movable component 12. The first throttling orifice 1211 and the second throttling orifice 1212 together form the second channel 121. In the open position, the first throttling orifice 1211 is connected to the inlet 112, and the second throttling orifice 1212 is connected to the outlet 113, thereby satisfying the function of high-pressure hydrogen flow. In addition, both the first throttling orifice 1211 and the second throttling orifice 1212 have a throttling effect, which can further reduce the impact of high-pressure hydrogen on the pressure reducing valve.

[0066] In some embodiments, the diameter of at least a portion of the first throttling orifice 1211 gradually decreases along the direction close to the first channel 122. For example, the first throttling orifice 1211 may include a first large orifice section, a first variable-diameter orifice section, and a first small orifice section. The diameter of the first large orifice section is larger than the diameter of the first small orifice section. The first variable-diameter orifice section is connected between the first large orifice section and the first small orifice section. The first small orifice section is directly connected to the first channel 122. The first large orifice section and the first small orifice section are both straight orifices, and the diameter of the first variable-diameter orifice section gradually decreases along the direction from right to left.

[0067] In some embodiments, the diameter of at least a portion of the second throttling orifice 1212 gradually decreases along the direction close to the first channel 122. For example, the second throttling orifice 1212 may include a second large orifice section, a second variable-diameter orifice section, and a second small orifice section. The diameter of the second large orifice section is larger than the diameter of the second small orifice section. The second variable-diameter orifice section is connected between the second large orifice section and the second small orifice section. The second small orifice section is directly connected to the first channel 122. Both the second large orifice section and the second small orifice section are straight orifices, and the diameter of the second variable-diameter orifice section gradually decreases from left to right.

[0068] In some embodiments, such as Figure 2 As shown, the movable component 12 is provided with a mounting hole 124. The mounting hole 124 is a blind hole located at the bottom of the movable component 12. The bottom opening of the mounting hole 124 communicates with the second cavity 1112, and the mounting hole 124 extends along the sliding direction (vertical direction) of the movable component 12. The upper part of the reset component 13 can fit into the mounting hole 124. The mounting hole 124 can enhance the guiding and telescopic effect of the reset component 13 and reduce the weight of the movable component 12, thereby facilitating reciprocating drive.

[0069] In some embodiments, the buffer module 100 includes a mounting base 15 and a sleeve 14. The sleeve 14 is fitted into the second cavity 1112. The mounting base 15 is fixed inside the sleeve 14. One end of the reset member 13 is in abutting contact with the movable member 12. The other end of the reset member 13 is located inside the sleeve 14 and is in abutting contact with the mounting base 15. A portion of the mounting base 15 extends into the reset member 13.

[0070] For example, such as Figure 2 and Figure 3As shown, the sleeve 14 can be a threaded sleeve, and the bottom of the second cavity 1112 can be provided with an opening. The sleeve 14 can be threaded into the second cavity 1112 through the opening at the bottom of the second cavity 1112. The sleeve 14 also has an annular portion that protrudes from the inner wall surface of the sleeve 14. The mounting seat 15 can be installed inside the sleeve 14, and the mounting seat 15 is located above the annular portion and is stopped and limited by the annular portion. The mounting seat 15 has a variable diameter structure, and the smaller radial dimension of the mounting seat 15 can extend into the reset member 13, thereby enhancing the constraint and limiting effect on the reset member 13. This facilitates the assembly of the reset member 13 and the moving member 12, and also facilitates later maintenance.

[0071] In some embodiments, such as Figure 2 and Figure 3 As shown, the inner diameter of the sleeve 14 is smaller than the outer diameter of the movable part 12, and a stepped surface 141 is formed between the sleeve 14 and the cavity wall of the mounting cavity 111. In the open position, the stepped surface 141 abuts against the movable part 12. This serves to limit the movement of the movable part 12, thereby stopping it in the open position and ensuring that the second channel 121 on the movable part 12 can be accurately aligned between the inlet 112 and the outlet 113.

[0072] In some embodiments, such as Figure 2 and Figure 3 As shown, the buffer module 100 includes a first sealing element 16 and a second sealing element 17. Both the first sealing element 16 and the second sealing element 17 can be annular sealing rings. The first sealing element 16 is embedded in the cavity wall of the mounting cavity 111 and surrounds the outer periphery of the upper half of the movable element 12, thereby achieving a seal for the first cavity 1111. The second sealing element 17 is embedded in the cavity wall of the mounting cavity 111 and surrounds the outer periphery of the lower half of the movable element 12, thereby achieving a seal for the second cavity 1112. This ensures the relative independence of the first cavity 1111 and the second cavity 1112.

[0073] It should be noted that the mounting base 15 may be provided with a through hole, which communicates with the outside through the inner hole of the annular portion of the sleeve 14. This allows gas in the second chamber 1112 to be discharged to the outside or outside gas to enter the second chamber 1112 when the movable member 12 moves up and down, thus stabilizing the air pressure. In some embodiments, the buffer module 100 includes an elastically deformable sealing gasket 18, which is installed in the first chamber 1111 and used to buffer the impact of the movable member 12. For example, as... Figure 1 and Figure 2As shown, the sealing gasket 18 can be made of rubber, silicone, etc., and can be fixed to the top wall of the first cavity 1111 by the clamping screw 19. When the movable part 12 moves back and forth in the vertical direction, the sealing gasket can achieve elastic contact with the movable part 12, which has the function of noise reduction and also avoids the movable part 12 from rigidly contacting the carrier 11. In addition, the overall sealing performance of the movable part 12 in the closed position can be enhanced by the compression and fit with the movable part 12.

[0074] The pressure reducing valve according to an embodiment of the present invention is described below.

[0075] The pressure reducing valve of this invention includes a valve body and a buffer module 100. The buffer module 100 can be any of the buffer modules described in the above embodiments, such as... Figure 4 and Figure 5 As shown, the valve body includes a housing 200 and a valve assembly. The housing 200 is provided with a valve inlet 221. The carrier 11 is integrally formed on the housing 200, that is, a part of the housing 200 can form the carrier 11, and the buffer module 100 is located between the valve assembly and the valve inlet 221.

[0076] like Figure 5 As shown, the valve assembly of the pressure reducing valve may include a valve 23, a valve stem 24, a push rod 25, a first elastic component 27, and a second elastic component 28.

[0077] The housing 200 has an inner cavity, a valve inlet 221, and a valve outlet 223. For example, the housing 200 can be separately configured and may include a valve body 22 and a valve cover 21, wherein the valve cover 21 can be threaded onto the upper part of the valve body 22. The inner cavity is the space enclosed by the valve body 22 and the valve cover 21. The valve inlet 221 and the valve outlet 223 can both be located on the valve body 22, and the valve inlet 221 and the valve outlet 223 can be arranged opposite each other in the left-right direction, wherein the valve inlet 221 can be located on the right side of the valve outlet 223.

[0078] The valve 23 is located inside the inner cavity and divides the inner cavity into a third cavity and a fourth cavity. The valve 23 is provided with a flow hole that connects the third cavity and the fourth cavity. The valve inlet 221 is connected to the third cavity, and the valve outlet 223 is connected to the fourth cavity.

[0079] Specifically, the valve 23 can be generally annular, and its material can be engineering plastics such as polychlorotrifluoroethylene, polyimide, or PEEK. A stepped surface 141 can be provided inside the cavity of the housing 200, and the valve 23 can be fixed to the stepped surface 141. In the vertical direction, the valve 23 can divide the inner cavity of the housing 200 into a third cavity and a fourth cavity, with the third cavity located below the fourth cavity. The inner hole of the valve 23 forms a flow-through hole. During use, fluid in the third cavity can flow into the fourth cavity through the flow-through hole, thereby allowing fluid entering through the valve inlet 221 to flow to the valve outlet 223. At the valve 23, due to its small flow area and ability to obstruct the fluid, pressure reduction can be achieved.

[0080] The valve stem 24 is assembled in the third cavity, and the push rod 25 is assembled in the fourth cavity. The push rod 25 and the valve stem 24 abut against each other and pass through the flow hole. The valve stem 24 can reciprocate along the axial direction of the flow hole to adjust the size of the flow area of ​​the flow hole.

[0081] For example, the radial dimension of the middle part of the push rod 25 can be relatively large, and the radial dimension of the bottom of the push rod 25 can be relatively small, forming a first column segment 251. Similarly, the radial dimension of a portion of the middle part of the valve stem 24 can be relatively large and generally conical, and the radial dimension of the top of the valve stem 24 can be relatively small, forming a second column segment. Both the first column segment 251 and the second column segment can be cylindrical, and the overall length of the first column segment 251 and the second column segment in the vertical direction is longer than the length of the flow orifice.

[0082] During assembly, the push rod 25 can be installed in the fourth chamber, and the first column segment 251 can be inserted into the flow passage. The valve stem 24 can be installed in the third chamber, and the second column segment can also be inserted into the flow passage. The radial dimensions of both the first column segment 251 and the second column segment are smaller than the diameter of the flow passage, thereby allowing fluid to flow from the third chamber into the fourth chamber through the gap.

[0083] The first elastic component 27 is assembled in the third cavity and is used to apply a force toward the push rod 25 to the valve stem 24. The second elastic component 28 is assembled in the fourth cavity and is used to apply a force toward the valve stem 24 to the push rod 25. Specifically, both the first elastic component 27 and the second elastic component 28 can be elastic elements such as springs. The first elastic component 27 can elastically push the valve stem 24 upward, and the second elastic component 28 can elastically push the push rod 25 downward. Under the action of the first elastic component 27 and the second elastic component 28, the push rod 25 and the valve stem 24 can maintain a stop contact, thereby playing a force transmission role.

[0084] During use, the valve stem 24 and the push rod 25 can move up and down. When the pressure at the valve inlet 221 increases, the valve stem 24 will move up under the combined action of hydraulic pressure and the first elastic component 27. Due to the tapered design of part of the valve stem 24, the gap between the valve stem 24 and the valve 23 will be reduced, thereby reducing the flow area and increasing the flow resistance, which plays a role in pressure reduction.

[0085] When the pressure at the valve inlet 221 decreases, the push rod 25 will push the valve stem 24 downward under the action of the second elastic component 28. At this time, the gap between the valve stem 24 and the valve 23 will increase, thereby increasing the flow area and reducing the flow resistance, thus avoiding the situation where the hydraulic pressure at the valve outlet 223 is too low.

[0086] In the pressure reducing valve of this embodiment, both the valve inlet 221 and the valve outlet 223 are connected to the inner cavity. The overall flow channel design inside the pressure reducing valve is simple and has low flow resistance, which ensures the output volume of the fluid flowing out through the valve outlet 223. Moreover, the flow area inside the pressure reducing valve can be adaptively adjusted according to the pressure of the fluid. When the pressure at the valve inlet 221 is low, the flow area will increase, thereby further ensuring the output flow rate at the valve outlet 223.

[0087] Secondly, compared to the valve core in the prior art, the valve core in this invention is separately configured and includes a valve stem 24 and a push rod 25. This avoids the need for a part of the valve core to be made into a slender structure due to the limitation of the diameter of the flow hole when it is designed as a whole (considering the case that the valve core needs to pass through the flow hole). The valve stem 24 and push rod 25 in this embodiment of the invention are not limited by the diameter of the flow hole and can adopt a larger radial dimension. This avoids the situation that a slender valve core has weak impact resistance and short service life, reduces the failure rate, and ensures the durability of use.

[0088] In some embodiments, such as Figure 5 As shown, the pressure reducing valve includes a nut 26, which can be an annular cylindrical shape. The outer circumference of the nut 26 has external threads, and a portion of the wall of the fourth cavity has internal threads. The nut 26 is threadedly fitted into the fourth cavity, and the valve 23 can be pressed and fixed between the nut 26 and the stepped surface 141, thus facilitating the installation and fixing of the valve 23. The internal space of the nut 26 forms an assembly cavity 262, and the push rod 25 can fit into the assembly cavity 262 of the nut 26. The push rod 25 can move up and down within the assembly cavity 262, thereby improving the compactness of the push rod 25 assembly.

[0089] In some embodiments, the nut 26 is provided with a communicating hole 261, which connects the assembly cavity 262 to the valve outlet 223. For example, Figure 5As shown, multiple connecting holes 261 can be provided, and the multiple connecting holes 261 can be arranged at equal intervals along the circumference of the nut 26. Moreover, each connecting hole 261 can be an oblique hole, that is, the connecting hole 261 extends obliquely upward in a direction from the inside to the outside.

[0090] In use, the fluid flowing in from the valve inlet 221 can first flow into the third chamber, then flow into the assembly chamber 262 through the flow passage, then flow into the fourth chamber through each connecting hole 261, and finally flow to the valve outlet 223.

[0091] In some embodiments, such as Figure 5 As shown, the first elastic component 27 includes a first sealing ring 272, a baffle 271, and a first elastic element 273. The first elastic element 273 can be a spring. The first sealing ring 272 is sleeved on the outer periphery of the valve stem 24 to achieve a seal between the valve stem 24 and the cavity wall of the third cavity. The baffle 271 is disposed on the upper side of the first sealing ring 272 and is used to press and fix the first sealing ring 272 in the third cavity. The valve stem 24 passes through the baffle 271. The first elastic element 273 is sleeved on the outer periphery of the valve stem 24, and the bottom end of the first elastic element 273 abuts against the baffle 271, and the top end of the first elastic element 273 abuts against the tapered portion of the valve stem 24.

[0092] Thus, both the sealing assembly of the valve stem 24 is achieved, and the first elastic element 273 can provide a reset force to the valve stem 24, thus meeting the usage requirements.

[0093] In some embodiments, such as Figure 5 As shown, the second elastic component 28 includes a piston 281, a seat 283, a second elastic element 282, an adjusting element 284, and a locking plug 285. The piston 281 is reciprocally mounted within the fourth cavity, and it serves to abut against the push rod 25; that is, the piston 281 is mounted within the fourth cavity and can reciprocate vertically within it. Circumferential sealing is achieved through the cooperation between the piston 281 and the cavity wall of the fourth cavity. The vertical movement of the piston 281 fulfills the requirement of driving the push rod 25 to move vertically.

[0094] The seat 283 is located within the fourth cavity, and the seat 283 can also be guided and slidably assembled with the fourth cavity, meaning that the seat 283 can move up and down reciprocally within the fourth cavity. The second elastic element 282 can also be a spring, and the second elastic element 282 can be assembled between the piston 281 and the seat 283. During use, the second elastic element 282 can push the piston 281 downward, thereby driving the piston 281 to move downward.

[0095] Adjusting component 284 is mounted on housing 200 and its position relative to housing 200 is adjustable. Adjusting component 284 is used to adjust the position of seat 283 to adjust the compression of the second elastic element 282. For example, adjusting component 284 can be a screw, or it can be threaded onto the top of valve cover 21. In use, the vertical position can be adjusted by turning adjusting component 284. When adjusting component 284 is adjusted downwards, it pushes seat 283 downwards, which in turn pushes the second elastic element 282, thereby increasing the pre-compression of the second elastic element 282. When adjusting component 284 is moved upwards, the pre-compression of the second elastic element 282 is decreased. The adjustment component 284 facilitates the adjustment of the preset elastic force of the second elastic element 282, meeting different pressure reduction requirements.

[0096] The locking plug 285 is fixed to the housing 200 and is used to seal the adjusting member 284 inside the housing 200. For example, the locking plug 285 can be a screw plug, which can be threaded onto the top of the valve cover 21, and the locking plug 285 can stop the adjusting member 284.

[0097] In some embodiments, such as Figure 5 As shown, a second sealing ring 2811 is embedded on the outer periphery of the piston 281. The piston 281 may have an annular groove on its periphery, and the second sealing ring 2811 may be embedded in the annular groove. The second sealing ring 2811 is used to seal the gap between the piston 281 and the cavity wall of the fourth chamber. Both the first sealing ring 272 and the second sealing ring 2811 are U-shaped rings (with a U-shaped cross-section) or spring energy storage rings, thereby fully ensuring the service life and reliability of the seal.

[0098] In some other embodiments, such as Figure 5 As shown, a third sealing ring 2812 may also be provided on the periphery of the piston 281, which can further improve the sealing between the piston 281 and the cavity wall of the fourth chamber.

[0099] In some embodiments, such as Figure 5 As shown, the top of the valve body 22 can be inserted into the valve cover 21, and the top end face of the valve body 22 can be provided with a fourth sealing ring 2813. The fourth sealing ring 2813 will be squeezed between the valve body 22 and the valve cover 21, thereby ensuring the sealing of the assembly between the valve body 22 and the valve cover 21.

[0100] In some embodiments, such as Figure 5As shown, the pressure reducing valve includes a filter 500, which is located at the valve inlet 221 and is used to filter the fluid entering through the valve inlet 221. This prevents impurities from easily damaging the valve stem 24, push rod 25, valve 23, etc., and further ensures the reliability of use and extends the service life.

[0101] In some embodiments, the pressure reducing valve includes a safety valve 300, which is disposed in the housing 200 and located on the side of the third chamber away from the fourth chamber, and the housing 200 is provided with a through hole 224 that connects the safety valve 300 and the valve outlet 223.

[0102] For example, such as Figure 4 and Figure 5 As shown, the safety valve 300 can be mounted on the bottom of the valve body 22. The valve body 22 may have a through hole 224 extending generally from the upper left to the lower right. The left end of the through hole 224 can communicate with the valve outlet 223, and the right end of the through hole 224 can communicate with the safety valve 300. When the pressure of the fluid at the valve outlet 223 is high, the safety valve 300 can open, thus providing protection.

[0103] In some embodiments, such as Figure 4 As shown, the pressure reducing valve includes a relief valve 400, which can be installed on the rear side of the valve body 22. The relief valve 400 is located in the housing 200 and communicates with the third chamber. The relief valve 400 is used to release the pressure at the front and rear ends of the pressure reducing valve during vehicle maintenance, thereby preventing operation under pressure. Furthermore, the housing 200 is provided with a sensor interface 222, which is arranged opposite to the relief valve 400, facilitating the installation of pressure sensors and other devices on the pressure reducing valve for intuitive monitoring.

[0104] In some embodiments, the pressure reducing valve includes a waterproof and breathable membrane 600, which is disposed in the housing 200 and located on the outer periphery of the fourth cavity. For example, as... Figure 5 As shown, the waterproof and breathable membrane 600 can be installed on the valve cover 21. The waterproof and breathable membrane 600 can connect the space between the piston 281 and the seat 283 with the outside, which facilitates the inflow and outflow of gas. This can balance the pressure during the movement of the piston 281, facilitate the movement of the piston 281, and ensure waterproof sealing.

[0105] In the description of this invention, it should be understood that the terms "center," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," and "circumferential" indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing this invention and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this invention.

[0106] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0107] In this invention, unless otherwise explicitly specified and limited, the terms "installation," "connection," "linking," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0108] In this invention, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "over," and "on top" of the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0109] In this invention, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0110] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A buffer module, characterized in that, include: A carrier having an installation cavity, an inlet, and an outlet, the installation cavity being connected between the inlet and the outlet; A movable component is provided with a first channel and a second channel, the second channel and the first channel intersect and communicate with each other, the movable component is disposed in the mounting cavity and divides the mounting cavity into a first cavity and a second cavity, the first channel communicates with the first cavity, the movable component is slidable relative to the carrier and has a closed position and an open position, in the closed position the movable component blocks at least one of the inlet and the outlet, in the open position the second channel communicates between the inlet and the outlet; A gap communicating with the second channel is preset between the movable component and the carrier. In the closed position, the gap, the second channel, and the first channel form a flow channel for the inlet fluid to flow into the first cavity so that the movable component is switched to the open position by the pressure of the fluid. A reset member is disposed in the second cavity, and the reset member is used to apply an elastic force to the movable member to reset the movable member to the closed position when no fluid flows into the inlet.

2. The buffer module according to claim 1, characterized in that, The inlet and the outlet are arranged coaxially. An annular groove is provided on the inner wall of the mounting cavity. The inlet and the outlet are located on the same side of the annular groove and are both connected to the annular groove. The annular groove surrounds the outer periphery of the movable part and forms the gap.

3. The buffer module according to claim 1, characterized in that, The movable component is provided with a first throttling orifice and a second throttling orifice. The first channel is connected between the first throttling orifice and the second throttling orifice, forming the second channel. In the open position, the first throttling orifice is connected to the inlet, and the second throttling orifice is connected to the outlet.

4. The buffer module according to claim 3, characterized in that, The diameter of at least a portion of the first throttling orifice gradually decreases along the direction close to the first channel, and / or, the diameter of at least a portion of the second throttling orifice gradually decreases along the direction close to the first channel.

5. The buffer module according to claim 1, characterized in that, The movable component is provided with an assembly hole, which communicates with the second cavity and extends along the sliding direction of the movable component. At least a portion of the reset component is fitted into the assembly hole.

6. The buffer module according to claim 5, characterized in that, It includes a mounting base and a sleeve. The sleeve fits into the second cavity, the mounting base is fixed in the sleeve, one end of the reset member is in abutment contact with the movable member, the other end of the reset member is located in the sleeve and is in abutment contact with the mounting base, and part of the mounting base extends into the reset member.

7. The buffer module according to claim 6, characterized in that, The inner diameter of the sleeve is smaller than the outer diameter of the movable part, and a stepped surface is formed between the sleeve and the cavity wall of the mounting cavity. In the open position, the stepped surface makes a stop contact with the movable part.

8. The buffer module according to claim 1, characterized in that, It includes a first sealing element and a second sealing element. The first sealing element is embedded in the cavity wall of the mounting cavity and surrounds the outer periphery of the movable element to achieve a seal for the first cavity. The second sealing element is embedded in the cavity wall of the mounting cavity and surrounds the outer periphery of the movable element to achieve a seal for the second cavity.

9. The buffer module according to any one of claims 1-8, characterized in that, It includes an elastically deformable sealing gasket, which is installed in the first cavity and is used to cushion the impact of the moving part.

10. A pressure reducing valve, characterized in that, The device includes a valve body and a buffer module as described in any one of claims 1-9 above. The valve body includes a housing and a valve assembly. The housing has a valve inlet. The carrier is integrally formed in the housing, and the buffer module is located between the valve assembly and the valve inlet.

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