A reversing valve and a fuel cell system

Abstract

The present application discloses a reversing valve and a fuel cell system. The reversing valve comprises: a valve seat, a first flow channel and a second flow channel connected to and perpendicular to the first flow channel are provided in the valve seat, a first inlet and a first outlet connected to the first flow channel are provided in the valve seat, and a second inlet connected to the second flow channel is provided in the valve seat; and a valve core, a third flow channel coaxial with the second flow channel is provided in the valve core, a valve core inlet and a valve core outlet connected to the third flow channel are provided in the valve core, the setting position of the valve core inlet corresponds to the setting position of the second inlet, and the valve core is movably arranged in the second flow channel so that the valve core outlet switches between a position corresponding to the first outlet and a position staggered from the first outlet. The position of the valve core outlet in the valve seat is automatically switched according to the pressure, and the flow channel switching is automatically realized, and there is no need to set an electric control device, and the structure is simple and the volume is compact; the reversing valve has no relatively narrow flow channel during use, and the flow resistance and pressure loss are small.

Description

Technical Field

[0001] The present application belongs to the field of fuel cell technology, and in particular relates to a reversing valve and a fuel cell system. Background Art

[0002] In the related art, the reversing valve generally adopts a spring type or a magnetic type reversing valve, which allows the fluid to overcome the elastic force of the spring to lift the valve core, and the passage between the valve core and the valve seat is relatively narrow, resulting in a large flow resistance for the fluid to pass through.

[0003] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0004] The present application aims to at least to some extent solve the technical problem of large flow resistance of conventional reversing valves. To this end, the present application provides a reversing valve and a fuel cell system.

[0005] An embodiment of the present application provides a reversing valve, the reversing valve comprising:

[0006] A valve seat, wherein a first flow channel and a second flow channel connected to and perpendicular to the first flow channel are formed in the valve seat, a first inlet and a first outlet connected to the first flow channel are formed in the valve seat, and a second inlet connected to the second flow channel is formed in the valve seat; and,

[0007] A valve core, wherein a third flow channel coaxial with the second flow channel is provided in the valve core, the valve core is provided with a valve core inlet and a valve core outlet connected to the third flow channel, the setting position of the valve core inlet corresponds to the setting position of the second inlet, and the valve core is movably set in the second flow channel so that the valve core outlet can switch between a position corresponding to the first outlet and a position staggered from the first outlet.

[0008] In some embodiments, the reversing valve further comprises:

[0009] A fixing seat, the fixing seat is arranged in the second flow channel, and the fixing seat is provided with a through hole corresponding to the second inlet;

[0010] An elastic reset member is connected between the valve core and the fixed seat, and the elastic reset member keeps the valve core outlet at a position staggered with the first outlet through a pre-tightening force.

[0011] In some embodiments, the reversing valve further includes a retaining spring; the second flow channel is provided with a retaining spring groove, the retaining spring groove is located between the fixing seat and the valve core, and the retaining spring groove is used to accommodate the retaining spring.

[0012] In some embodiments, a retaining ring is provided in the second flow channel, and the retaining ring is located on a side of the fixing seat opposite to the retaining ring groove. In some embodiments, a buffer pad is provided on the inner side of a side wall of the valve seat corresponding to the second inlet.

[0013] In some embodiments, a side wall of the valve seat corresponding to the second inlet is a movable side wall, and the movable side wall is detachably disposed on the valve seat.

[0014] In some embodiments, the valve seat is provided with a limit pin, and the valve core is provided with a positioning groove matching the limit pin; and / or, the valve seat is provided with a limit groove, and the valve core is provided with a positioning pin matching the limit groove.

[0015] In some embodiments, a limit pin hole is defined in the second flow channel, and the limit pin is connected to the limit pin hole by interference fit.

[0016] In some embodiments, the length of the limiting groove and / or the positioning groove is greater than or equal to the moving distance of the valve core relative to the second flow channel.

[0017] An embodiment of the present application further provides a fuel cell system, which includes a fuel cell and the above-mentioned reversing valve.

[0018] The embodiments of the present application have at least the following beneficial effects:

[0019] The above-mentioned reversing valve, by making the valve core movably arranged in the second flow channel, the valve core can automatically switch the position of the valve core outlet in the valve seat according to the pressure, so as to switch the conduction condition between the first flow channel and the second flow channel. The flow channel switching can be automatically realized by the reversing valve, and there is no need to set up an electronic control device, so that the structure of the reversing valve is simple and the size is compact; at the same time, there are no relatively narrow flow channels in the two flow channels of the reversing valve during use, and the flow resistance and pressure loss of the reversing valve are small. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0021] Figure 1 A top view of the reversing valve in the embodiment of the present application;

[0022] Figure 2 Shows Figure 1 A cross-sectional view taken along the line AA when the middle reversing valve is in the first state;

[0023] Figure 3 Shows Figure 1 A cross-sectional view taken along the line AA when the middle reversing valve is in the second state;

[0024] Figure 4 Shows Figure 1 A BB-direction cross-sectional view of the middle reversing valve when it is in the first state;

[0025] Figure 5 Shows Figure 1 A BB-direction cross-sectional view of the middle reversing valve when it is in the second state;

[0026] Figure 6 Shows Figure 1 AA section view of the middle valve seat of the middle reversing valve;

[0027] Figure 7 Shows Figure 1 AA section view of the valve core in the middle reversing valve;

[0028] Figure 8 Shows Figure 2 A schematic diagram of the three-dimensional structure of the fixed seat in the middle reversing valve;

[0029] Fig. 9 This is a schematic diagram of the working process of the fuel cell system in the embodiment of the present application when the reversing valve is in the first state;

[0030] Fig.10 This is a schematic diagram of the working process of the fuel cell system in an embodiment of the present application when the reversing valve is in the second state.

[0031] Reference numerals:

[0032] 1000, reversing valve; 100, valve seat; 110, first flow channel; 111, first inlet; 112, first outlet; 120, second flow channel; 121, second inlet; 130, anti-dropping retaining ring; 140, retaining ring groove; 150, buffer pad; 160, movable side wall; 170, limit pin; 171, limit pin hole; 180, sealing ring groove; 181, sealing ring; 190, connecting piece; 200, valve core; 210, third flow channel; 211, valve core inlet; 212, valve core outlet; 220, positioning groove; 230, valve core side wall; 231, side wall chamfer; 240, valve core top wall; 241, top wall chamfer; 251, connecting column; 252, connecting hook hole; 300, fixing seat; 311, outer frame; 312, connecting frame; 320, through hole; 331, fixing hook hole; 332, fixing column; 400, elastic reset member; 500, retaining spring; 01, switch valve; 02, medium pressure sensor; 03, proportional valve; 04, ejector; 05, secondary inlet of ejector; 06, low pressure sensor for stack inlet; 07, anode reaction gas inlet; 08, fuel cell; 09, anode reaction gas outlet; 10, low pressure sensor for stack outlet; 11, gas-liquid separator; 12, exhaust tee; 13, nitrogen exhaust valve; 14, drain valve; 15, mixing device; 16, circulating pump; 19, first tee outlet; 20, second tee outlet. DETAILED DESCRIPTION

[0033] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are only part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without making creative work are within the scope of protection of this application.

[0034] In addition, the present application may repeat reference numbers and / or reference letters in different examples, and such repetition is for the purpose of simplicity and clarity, and does not in itself indicate the relationship between the various embodiments and / or settings discussed. In addition, the present application provides various specific examples of processes and materials, but those of ordinary skill in the art may recognize the application of other processes and / or the use of other materials.

[0035] The present application is described below with reference to the accompanying drawings and specific embodiments:

[0036] The present application embodiment provides a reversing valve 1000, such as Figures 1 to 8As shown, the reversing valve 1000 includes a valve seat 100 and a valve core 200. The valve seat 100 is provided with a first flow channel 110 and a second flow channel 120 connected to and perpendicular to the first flow channel 110, the valve seat 100 is provided with a first inlet 111 and a first outlet 112 connected to the first flow channel 110, and the valve seat 100 is provided with a second inlet 121 connected to the second flow channel 120; the valve core 200 is provided with a third flow channel 210 coaxial with the second flow channel 120, the valve core 200 is provided with a valve core inlet 211 and a valve core outlet 212 connected to the third flow channel 210, the setting position of the valve core inlet 211 corresponds to the setting position of the second inlet 121, and the valve core 200 is movably arranged in the second flow channel 120 so that the valve core outlet 212 switches between a position corresponding to the first outlet 112 and a position staggered from the first outlet 112.

[0037] In the reversing valve 1000 of the embodiment of the present application, by making the valve core 200 movably arranged in the second flow channel 120, the valve core 200 can automatically switch the position of the valve core outlet 212 in the valve seat 100 according to the pressure, so as to switch the conduction condition of the first flow channel 110 and the second flow channel 120. The flow channel switching can be automatically realized by the reversing valve 1000 without setting up an electronic control device, so that the structure of the reversing valve 1000 is simple and the size is compact; at the same time, the two flow channels of the reversing valve 1000 do not have relatively narrow flow channels during use, and the flow resistance and pressure loss of the reversing valve 1000 are small.

[0038] In the related art, the reversing valve 1000 generally adopts a spring type or a magnetic type reversing valve 1000, and the fluid overcomes the elastic force of the spring or the magnetic force to push the valve core 200 to move, exposing the annular channel between the valve core 200 and the valve seat 100, but the channel between the valve core 200 and the valve seat 100 is generally narrow, and there are defects such as large flow resistance and high pressure loss when the fluid flows through the channel. When this type of reversing valve 1000 is used in a fuel cell system, the excessive flow resistance will offset the pressure increase of the circulation pump 16 or the ejector 04, resulting in poor circulation performance of the anode reaction gas, thereby affecting the performance of the fuel cell system. In addition, in the related art, the reversing valve 1000 used is a one-way valve, and more than two one-way valves need to be used in the fuel cell system, which will cause the fuel cell system to be relatively large.

[0039] For example, a vertical one-way valve in the related art includes a valve body with a valve cavity provided inside, a spherical valve disc provided inside the valve cavity, and a valve seat 100 matched and sealed with the spherical valve disc; the valve body includes an upper valve body provided with a fluid outlet and a lower valve body provided with a fluid inlet; the valve seat 100 is provided at the fluid inlet; the upper valve body is provided with a receiving groove for accommodating the spherical valve disc at a position directly above the fluid inlet; the spherical valve disc and the valve seat 100 are made of magnetic materials, and the spherical valve disc is reset by magnetic force and contacts and seals with the valve seat 100. On the one hand, the vertical one-way valve is a one-way flow valve body structure, and more than two vertical one-way valves and corresponding pipelines need to be provided in the fuel cell system, which will make the fuel cell system relatively large; on the other hand, the anode reaction gas needs to continuously lift the valve core 200, and the flow channel between the valve core 200 and the valve seat 100 is narrow, resulting in greater resistance when the anode reaction gas circulates.

[0040] In some embodiments, the reversing valve 1000 proposed in the present application can be used in the circulation structure of the anode reaction gas of the fuel cell system to reduce the flow resistance of the anode reaction gas during the circulation process and reduce the compression of the anode reaction gas, thereby improving the overall performance of the fuel cell system.

[0041] In other embodiments, the reversing valve 1000 of the present application may also be used in other fluid systems for preventing fluid backflow and changing the fluid flow path. Those skilled in the art may adaptively set the reversing valve 1000 according to the fluid flow direction of the fluid system.

[0042] As global environmental and energy issues become increasingly severe, fuel cell vehicles are considered to be the most promising energy power devices in the future due to their advantages of being pollution-free, having high energy conversion efficiency, and having a wide range of raw material sources. In the following embodiments of the present application, hydrogen is used as an anode reaction gas as an example to exemplify the reversing valve 1000 and the fuel cell system having the reversing valve.

[0043] In the fuel cell system, from the perspective of power demand, component performance and efficiency, the circulation structure of the anode reaction gas of the vehicle-mounted fuel cell system can adopt a circulation method of a circulation pump 16, an ejector 04 or a circulation pump 16 and an ejector 04. Compared with the ejector 04, the circulation pump 16 has a good circulation effect in the full range of working conditions and has active adjustability. Compared with the circulation pump 16, the ejector 04 has the advantages of simple structure, reliable operation, low noise and no additional power consumption. In the medium and high power range, the ejector 04 can obtain a good ejection coefficient and can generate sufficient pressure rise, and the anode reaction gas that has not been completely reacted at the anode after gas-liquid separation is pressurized and transported to the anode reaction gas inlet 07 of the fuel cell to participate in the next electrochemical reaction; however, in the low power range, the ejector 04 has inherent problems such as poor ejection coefficient, resulting in insufficient ejection capacity and insufficient anode reaction gas pressure increase, thereby affecting the performance of the entire fuel cell system. Therefore, in the actual application process, the anode reaction gas generally adopts the circulation mode of series connection, parallel connection, series-parallel connection, etc. of the circulation pump 16 and the ejector 04, so that the fuel cell system uses the circulation pump 16 alone in the low power section to pressurize the anode reaction gas that has not reacted completely at the anode after gas-liquid separation and transport it to the anode reaction gas inlet 07 of the fuel cell to participate in the next electrochemical reaction; in the medium and high power section, the circulation pump 16 stops running, and the ejector 04 is used alone to pressurize the anode reaction gas that has not reacted completely at the anode after gas-liquid separation and transport it to the anode reaction gas inlet 07 of the fuel cell to participate in the next electrochemical reaction. In particular, the circulation connection mode of the circulation pump 16 and the ejector 04 in parallel does not limit the structural form of the circulation pump 16, and can make the anode reaction gas have a good circulation effect in the full range of working conditions, so it has a wider range of applications.

[0044] In some embodiments, Fig. 9 and Fig.10As shown, in the circulation structure of the anode reaction gas used in conjunction with the circulation pump 16 and the ejector 04, a reversing valve 1000 needs to be set in the circulation structure to prevent the anode reaction gas from flowing back, and the on-off of the anode reaction gas circulation pump 16 pressurization path and the on-off of the ejector 04 heating path can be controlled respectively. When the low-power section circulation pump 16 is running, the circulating anode reaction gas separated by the gas-liquid separator 11 enters the circulation pump 16, and is conveyed to the anode stack inlet pipeline after being pressurized by the rotor or blades. At this time, the anode stack inlet pipeline, the ejector 04, the circulation pump 16 and the outlet of the gas-liquid separator 11 are connected in series. If there is no reversing valve 1000 device in the middle, the anode reaction gas with a higher pressure established by the circulation pump 16 will flow back to the inlet of the gas-liquid separator 11, resulting in the inability to establish the pressure of the anode reaction gas inlet 07, and the power consumption of the circulation pump 16 is wasted. Therefore, it is necessary to set a reversing valve 1000 device on the pipeline between the ejector 04 and the circulation pump 16. Similarly, when the ejector 04 is running in the medium and high power range, the circulating anode reaction gas separated by the gas-liquid separator 11 enters the ejector 04, and is pressurized by the ejector 04 and transported to the anode stack pipeline. At this time, the anode stack pipeline, the ejector 04 and the outlet of the gas-liquid separator 11 are connected in series. If there is no reversing valve 1000 device in the middle, the anode reaction gas with a higher pressure established by the ejector 04 will flow back to the inlet of the gas-liquid separator 11, resulting in the inability to establish the pressure of the anode reaction gas inlet 07, and the ejector 04 pressure increase is wasted. Therefore, it is necessary to set a reversing valve 1000 device on the pipeline between the ejector 04 and the outlet of the gas-liquid separator 11.

[0045] In the above embodiment, the first inlet 111, the second inlet 121 and the first outlet 112 of the reversing valve 1000 are respectively connected to the pipeline of the anode reaction gas, and the anode reaction gas can enter the one-way valve through the first inlet 111 or the second inlet 121, and exit the one-way valve through the first outlet 112. When the pressure in the anode reaction gas circulation pipeline is relatively small, that is, the fuel cell system is in a low power stage, such as Figure 3 As shown, the pressure of the anode reaction gas cannot overcome the resistance of the valve core 200, so that the valve core 200 can remain in the state of being located in the second flow channel 120, and the valve core outlet 212 of the valve core 200 is blocked by the outer wall of the valve seat 100, and at the same time, the second inlet 121 of the valve seat 100 is blocked by the valve core 200, and the flow path of the anode reaction gas in the first flow channel 110 is blocked and disconnected. At this time, the anode reaction gas enters the first flow channel 110 of the one-way valve through the first inlet 111, and then discharges the one-way valve through the first outlet 112 connected to the first flow channel 110; when the pressure in the anode reaction gas circulation pipeline is relatively large, that is, when the fuel cell system is in the medium and high power stage, as shown in FIG. Figure 5As shown, the pressure of the anode reaction gas can overcome the resistance of the valve core 200, and can drive the valve core 200 to move in the second flow channel 120, so that the valve core 200 moves to the connection between the first flow channel 110 and the second flow channel 120. At this time, the part of the first flow channel 110 of the valve seat 100 facing the first inlet 111 is blocked by the valve core 200, and the valve core outlet 212 of the valve core 200 is connected with the part of the first flow channel 110 facing the first outlet 112. At the same time, the valve core 200 avoids the second inlet 121 of the second flow channel 120, so that the anode reaction gas can enter the second flow channel 120 through the second inlet 121, and then enter the part of the first flow channel 110 facing the first outlet 112 through the valve core outlet 212 of the valve core 200, and the one-way valve can be discharged through the first outlet 112.

[0046] When the reversing valve 1000 of the present application is used in the anode reaction gas circulation structure of the fuel cell, the two reversing valves 1000 that need to be set in parallel with the ejector 04 and the circulation pump 16 are replaced by one reversing valve 1000 of the embodiment of the present application, so that the flow path of the anode reaction gas in the circulation structure is switched by the reversing valve 1000, and the flow resistance of the two anode reaction gas flow paths is low, basically zero, and the reversing valve 1000 is driven by the pressure difference of the anode reaction gas, and there is no need to set an electromagnetic valve for control. The two anode reaction gas flow paths can be automatically adjusted to open or close according to the operating conditions of the fuel cell system. The two anode reaction gas flow paths are respectively the anode reaction gas flow path with the ejector 04 and the anode reaction gas flow path with the circulation pump 16, and the anode reaction gas can also be effectively prevented from flowing back.

[0047] In some embodiments, Figures 1 to 5 As shown, the valve seat 100 as a whole may be a rectangular parallelepiped structure, and a first flow channel 110 and a second flow channel 120 are provided inside the valve seat 100, wherein the second flow channel 120 is connected to the middle of the first flow channel 110 to form a T-shaped structure, and the axis of the second flow channel 120 is perpendicular to the axis of the first flow channel 110. The first inlet 111 and the first outlet 112 are located at both ends of the first flow channel 110, and the second inlet 121 is located at one end of the second flow channel 120 that is not connected to the first flow channel 110.

[0048] In some embodiments, Figure 3 and Figure 5 As shown, structures such as pier heads or pagoda heads may be provided at the first inlet 111, the second inlet 121 and the first outlet 112, respectively, so as to facilitate connection with the pipeline and prevent the pipeline from falling off after connection.

[0049] In some embodiments, the first flow channel 110 and the second flow channel 120 may be cylindrical flow channels, and the first inlet 111 , the second inlet 121 and the outlet may be circular opening structures.

[0050] In other embodiments, the first flow channel 110 and the second flow channel 120 may also be in a rectangular flow channel structure.

[0051] In some embodiments, Figure 7 As shown, the valve core 200 includes a valve core side wall 230 and a valve core top wall 240. The valve core side wall 230 is arranged on the valve core top wall 240 to form a cylindrical structure with an opening at one end. The opening relative to the valve core top wall 240 serves as the valve core inlet 211. At the same time, a through hole 320 is opened on the valve core side wall 230 as the valve core outlet 212, that is, the axis of the valve core inlet 211 is perpendicular to the axis of the valve core outlet 212.

[0052] In some embodiments, Figure 7 The valve core 200 shown can be a cylindrical structure, that is, the valve core side wall 230 forms a hollow cylindrical structure around the valve core top wall 240, and the hollow cylindrical structure matches the second flow channel 120 of the valve seat 100, so that the outer diameter of the valve core side wall 230 is equal to the inner diameter of the second flow channel 120 and forms a certain clearance fit tolerance, so that the valve core 200 and the second flow channel 120 of the valve seat 100 form a clearance fit structure, ensuring that the valve core 200 moves smoothly in the second flow channel 120 of the valve seat 100 under a certain sealing premise.

[0053] In other embodiments, the valve core 200 may also be in a rectangular parallelepiped structure, but it is only necessary to ensure that the valve core side wall 230 matches the structure inside the second flow channel 120 of the valve seat 100 .

[0054] In some embodiments, Figure 7 As shown, a top wall chamfer 241 can be provided at the top wall 240 of the valve core, and a side wall chamfer 231 corresponding to the top wall chamfer 241 can be provided at the side wall 230 of the valve core. That is to say, a top wall chamfer 241 and a side wall chamfer 231 are respectively provided at opposite ends of the moving direction of the valve core 200 to guide the moving direction of the valve core 200, so that the valve core 200 can move smoothly in the second flow channel 120 to avoid jamming and the like.

[0055] As an optional embodiment, an elastic reset member 400 may be provided between the valve core 200 and the valve seat 100. The elastic reset member 400 with suitable stiffness and preload is selected to design the conditions for the movement of the valve core 200 relative to the valve seat 100. That is, by selecting the elastic reset member 400 with suitable stiffness and preload to design the connection conditions between the second inlet 121 and the first outlet 112, switching between the two anode reaction gas flow paths is achieved, and the opening and closing of the two anode reaction gas flow paths are completed. In other words, the operation switching of the circulation pump 16 and the ejector 04 is achieved, which can make the volume of the two anode reaction gas paths compact without adding additional electronic control devices.

[0056] As an optional implementation, Figures 1 to 8 As shown, the reversing valve 1000 further includes a fixing seat 300 and an elastic reset member 400. The fixing seat 300 is disposed in the second flow channel 120, and the fixing seat 300 is provided with a through hole 320 corresponding to the second inlet 121; the elastic reset member 400 is connected between the valve core 200 and the fixing seat 300, and the elastic reset member 400 keeps the valve core outlet 212 at a position staggered from the first outlet 112 through a pre-tightening force.

[0057] In some embodiments, Figures 1 to 8 As shown, by setting the fixing seat 300 in the second flow channel 120, and connecting the elastic reset member 400 between the fixing seat 300 and the valve core 200, the valve core outlet 212 of the valve core 200 is staggered with the first outlet 112 by the pre-tightening force of the elastic reset member 400, that is, when the reversing valve 1000 is not in operation, the reversing valve 1000 can maintain the state where the first inlet 111 is connected with the first outlet 112. At the same time, the fixing seat 300 is provided with a through hole 320 corresponding to the second inlet 121, so that the fluid can enter the valve core inlet 211 through the through hole 320.

[0058] When a fluid of a certain pressure enters the second flow channel 120 from the second inlet 121, the fluid passes through the through hole 320 and the valve core inlet 211 into the interior of the valve core 200 and acts on the valve core top wall 240 of the valve core 200. The pressure generated by the fluid is recorded as P, the area of ​​the valve core top wall 240 is recorded as S, and the thrust generated by the fluid is recorded as F1, then F1=P·S. At the same time, the stiffness coefficient of the elastic reset member 400 is recorded as k, and the stroke of the valve core 200 when the valve core outlet 212 is fully exposed to correspond to the first outlet 112 is recorded as L. Then when F1>F preload force+kL, the thrust generated by the fluid overcomes the sum of the preload force and the tensile force of the elastic reset member 400, and pushes the valve core 200 to a position where the valve core outlet 212 is fully exposed to correspond to the first outlet 112. The valve core outlet 212 can be fully exposed to correspond to the first outlet 112. At this time, the second inlet 121 is connected to the first outlet 112, and the first inlet 111 is disconnected from the first outlet 112; when the fluid pressure entering the second flow channel 120 through the second inlet 121 decreases, when F1<F preload+kL, the valve core 200 moves toward the second inlet 121 relative to the valve seat 100 under the action of the elastic reset member 400, until the valve core 200 moves to a state where the valve core outlet 212 is staggered from the first outlet 112 under the action of the elastic reset member 400. At this time, the first inlet 111 is connected to the first outlet 112 again, and the second inlet 121 is disconnected from the first outlet 112.

[0059] In some embodiments, Figure 7As shown, the top wall 240 of the valve core is provided with a connecting column 251, and the connecting column 251 is used to connect with the elastic reset member 400 to achieve the connection between the valve core 200 and the elastic reset member 400. Optionally, the connecting column 251 is provided with a connecting hook hole 252, and the elastic reset member 400 is connected to the connecting column 251 through the connecting hook hole 252, thereby achieving the connection between the elastic reset member 400 and the valve core 200.

[0060] In some embodiments, Figure 8 As shown, the fixed seat 300 includes an outer frame 311 and a plurality of connecting frames 312 disposed in the outer frame 311, and a through hole 320 is formed between the outer frame 311 and the connecting frame 312, and the through hole 320 is used for allowing the fluid to pass through the fixed seat 300 and enter the inlet of the valve seat 100. A fixing column 332 may be provided on the fixed seat 300, for example, a fixing column 332 is provided on a plurality of connecting frames 312, and the fixing column 332 is used to connect with the elastic reset member 400 to achieve the connection between the fixed seat 300 and the elastic reset member 400. Optionally, a fixing hook hole 331 is provided on the fixing column 332, and the elastic reset member 400 is connected to the fixing column 332 through the fixing hook hole 331.

[0061] In some embodiments, Figures 2 to 5 As shown, the connecting column 251 of the valve core 200 corresponds to the fixing column 332 of the fixing seat 300, so that the axis of the elastic return member 400 between the connecting column 251 and the fixing column 332 is parallel to or coincides with the axis of the second flow channel 120, so that the force generated by the elastic return member 400 is parallel to the axis of the second flow channel 120, so that the valve core 200 can be moved along the axial direction of the second flow channel 120 through the elastic return member 400, thereby avoiding displacement or deflection of the valve core 200 during movement.

[0062] In some embodiments, Figures 2 to 5 As shown, the outer frame 311 of the fixing seat 300 matches the structure of the second flow channel 120. When the second flow channel 120 is a cylindrical flow channel, the outer frame 311 of the fixing seat 300 is a circular frame; when the second flow channel 120 is a rectangular flow channel, the outer frame 311 of the fixing seat 300 can be a rectangular frame.

[0063] In some embodiments, the size of the outer frame 311 of the fixing seat 300 matches the size of the second flow channel 120 and forms a clearance tolerance fit, so that the fixing seat 300 and the second flow channel 120 can form a clearance fit connection structure.

[0064] In some embodiments, the cross section of the outer frame 311 of the fixing seat 300 is optionally rectangular, so that the outer frame 311 of the fixing seat 300 can be kept horizontal in the second flow channel 120 to prevent the outer frame 311 from deflecting relative to the second flow channel 120. As an optional embodiment, Figures 2 to 5 As shown,

[0065] The reversing valve 1000 further includes a retaining spring 500 . The second flow channel 120 is provided with a retaining spring groove 140 . The retaining spring groove 140 is located between the fixing seat 300 and the valve core 200 , and the retaining spring groove 140 is used to accommodate the retaining spring 500 .

[0066] In some embodiments, Figures 2 to 5 As shown, by setting a retaining spring 500 in the second flow channel 120, the fixing seat 300 is fixed in the second flow channel 120 by the retaining spring 500, so that the fixing seat 300 is fixed relative to the second flow channel 120, thereby fixing one end of the elastic return member 400 through the fixing seat 300.

[0067] In some embodiments, in order to enable the fixing seat 300 to play a relatively stable fixing role on one end of the elastic reset member 400, the fixing seat 300 as a whole should be relatively firmly fixed in the second flow channel 120, and it is necessary to prevent the fixing seat 300 from moving relative to the second flow channel 120. By providing a retaining spring groove 140 in the second flow channel 120, the retaining spring 500 is inserted into the retaining spring groove 140 so that the retaining spring 500 is located between the valve core 200 and the fixing seat 300, so that the retaining spring 500 is limited and fixed by the retaining spring 500, and the fixing seat 300 is prevented from moving toward the valve core 200 driven by the elastic reset member 400.

[0068] In some other embodiments, the fixing seat 300 can also be fixed in the second flow channel 120 by other means, such as by elastic clips, limiting connectors 190 and other structures. Those skilled in the art can make appropriate choices based on the structural characteristics of the second flow channel 120 and the fixing seat 300, which will not be repeated here.

[0069] As an optional implementation, Figures 2 to 5 As shown, an anti-slip ring 130 is disposed in the second flow channel 120 , and the anti-slip ring 130 is located on a side of the fixing seat 300 opposite to the retaining ring groove 140 .

[0070] In some embodiments, by disposing an anti-slip ring 130 in the second flow channel 120, the anti-slip ring 130 protrudes relative to the second flow channel 120, which can be used to prevent the fixing seat 300 from escaping from the second flow channel 120. The inner diameter of the anti-slip ring 130 is smaller than the inner diameter of the second flow channel 120, so that the anti-slip ring 130 protrudes relative to the second flow channel 120, so as to prevent the fixing seat 300 from escaping from the second flow channel 120.

[0071] In some embodiments, Figures 2 to 5 As shown, the anti-slip ring 130 and the retaining spring 500 are respectively located on both sides of the fixing seat 300, and can fix the fixing seat 300 in the second flow channel 120 from two directions. In some embodiments, the distance between the anti-slip ring 130 and the retaining spring groove 140 is greater than or equal to the thickness of the fixing seat 300.

[0072] In some embodiments, the anti-slip retaining ring 130 and the valve seat 100 are an integral structure, that is, the anti-slip retaining ring 130 and the valve seat 100 are integrally formed.

[0073] In some embodiments, Figures 2 to 5 As shown, optionally, the anti-slip ring 130 is located in the second flow channel 120 at a position corresponding to the second inlet 121. As an optional embodiment, as Figures 2 to 5 As shown, a buffer pad 150 is provided on the inner side of the side wall of the valve seat 100 corresponding to the second inlet 121 .

[0074] In some embodiments, Figures 2 to 5 As shown, the valve core 200 moves in the second flow channel 120. When the valve core 200 moves to a position where the valve core outlet 212 corresponds to the first outlet 112, the valve core 200 can contact the side wall of the valve seat 100 corresponding to the second inlet 121. In order to avoid a collision between the valve core 200 and the valve seat 100, a buffer pad 150 is provided on the inner side of the side wall of the valve seat 100 corresponding to the second inlet 121. The buffer pad 150 buffers the collision stress generated by the valve core 200 on the valve seat 100, thereby avoiding damage to the valve seat 100 and / or collision noise.

[0075] As an optional implementation, the side wall of the valve seat 100 corresponding to the second inlet 121 is a movable side wall 160 , and the movable side wall 160 is detachably disposed on the valve seat 100 .

[0076] In some embodiments, Figures 1 to 5As shown, in order to conveniently install the valve core 200, the fixed seat 300, the retaining spring 500 and other structures in the valve seat 100, the side wall of the valve seat 100 corresponding to the second inlet 121 can be a movable side wall 160, and the movable side wall 160 can be detachably arranged on the valve seat 100. The movable side wall 160 can be removed and then the fixed seat 300, the retaining spring 500, the elastic return member 400 and the valve core 200 can be arranged in the second flow channel 120 in sequence, and then the movable side wall 160 can be installed on the valve seat 100 to realize the assembly of the reversing valve 1000.

[0077] In some embodiments, a plurality of fixing connection holes may be respectively opened at corresponding positions on the valve seat 100 body and the movable side wall 160 , and the movable side wall 160 may be fixed to the valve seat 100 body through the connecting member 190 .

[0078] In some embodiments, in order to ensure the overall sealing of the valve seat 100, a sealing ring groove 180 corresponding to the movable side wall 160 is opened on the main body of the valve seat 100, and a sealing ring 181 is provided in the sealing ring groove 180. The movable cover plate is pressed against the sealing ring 181 to seal the gap between the movable side wall 160 and the main body of the valve seat 100 through the sealing ring 181, thereby avoiding leakage problems of the reversing valve 1000 at the movable side wall 160.

[0079] In some embodiments, the movable side wall 160 has at least four distributed fixed connection holes to achieve a detachable connection between the movable side wall 160 and the main body of the valve seat 100 .

[0080] As an optional implementation, Figure 2 , Figure 4 as well as Figure 7 As shown, the valve seat 100 is provided with a limit pin 170, and the valve core 200 is provided with a positioning groove 220 matching the limit pin 170; and / or, the valve seat 100 is provided with a limit groove, and the valve core 200 is provided with a positioning pin matching the limit groove.

[0081] like Figure 2 , Figure 4 as well as Figure 7 As shown, the limiting pin 170 and / or the limiting groove are located in the second flow channel 120 or in a position corresponding to the first flow channel 110 and the second flow channel 120 .

[0082] In some embodiments, Figure 2 , Figure 4 as well as Figure 7As shown, a limit pin 170 is provided in the second flow channel 120, so that the positioning pin protrudes relative to the interior of the second flow channel 120, and the protruding direction of the positioning pin is perpendicular to the axis of the first flow channel 110 and the axis of the second flow channel 120, respectively. A positioning groove 220 matching the limit pin 170 is provided on the valve core 200. When the valve core 200 is installed in the second flow channel 120, the positioning groove 220 is sleeved on the limit pin 170. The limit pin 170 and the positioning groove 220 can limit the movement path of the valve core 200, so that the valve core 200 can move in the axial direction of the second flow channel 120, which can prevent the valve core 200 from rotating relative to the second flow channel 120, thereby preventing the valve core outlet 212 from being offset and unable to correspond to the first outlet 112.

[0083] Similarly, in some embodiments, such as Figure 2 , Figure 4 as well as Figure 7 As shown, a limit groove is set in the second flow channel 120, and a positioning pin matching the limit pin 170 is set on the valve core 200. When the valve core 200 is installed in the second flow channel 120, the positioning pin is located in the limit groove. The movement path of the valve core 200 can be limited by the limit groove and the positioning pin, so that the valve core 200 can move in the axial direction of the second flow channel 120, which can prevent the valve core 200 from rotating relative to the second flow channel 120, thereby preventing the valve core outlet 212 from being offset and unable to correspond to the first outlet 112.

[0084] In some embodiments, Figure 2 , Figure 4 as well as Figure 7 As shown, the positioning pin and / or positioning groove 220 are arranged on the valve core side wall 230 of the valve core 200 and the valve core outlet 212 at a 90° interval. Correspondingly, the limiting pin 170 and / or limiting groove are arranged on the inner wall of the valve seat 100 perpendicular to the axis of the first outlet 112.

[0085] As an optional implementation, Figure 4 and Figure 6 As shown, the second flow channel 120 is provided with a limit pin hole 171 , and the limit pin 170 is connected with the limit pin hole 171 by interference fit.

[0086] In some embodiments, Figure 4 and Figure 6 As shown, a limit pin hole 171 is provided in the second flow channel 120, so that the limit pin 170 is connected with the limit pin hole 171 by interference fit, thereby fixing the limit pin 170 in the second flow channel 120. The limit pin hole 171 allows the limit pin 170 to be installed in the second flow channel 120 after the fixing seat 300 and other structures are installed, thereby avoiding premature installation of the limit pin 170 to affect the installation of the fixing seat 300 and other structures.

[0087] As an optional implementation, the length of the limiting groove and / or the positioning groove 220 is greater than or equal to the moving distance of the valve core 200 relative to the second flow channel 120 .

[0088] In some embodiments, by making the length of the limit groove and / or the positioning groove 220 greater than or equal to the moving distance of the valve core 200 relative to the second flow channel 120, it is possible to avoid the limit groove and / or the positioning groove 220 affecting the moving distance of the valve core 200 and interfering with the effect of the elastic return member 400 on the valve core 200.

[0089] In the above embodiments of the present application, optionally, Figures 2 to 5 As shown, the height of the valve core 200 in the axial direction of the second flow channel 120 is less than or equal to the distance between the lowest point of the first flow channel 110 and the retaining spring 500, so that when the elastic return member 400 of the valve core 200 is in an unstretched state, the top wall 240 of the valve core does not exceed the lowest point of the first flow channel 110, thereby ensuring that the first flow channel 110 between the first inlet 111 and the second outlet remains unobstructed.

[0090] Alternatively, if Figures 2 to 5 As shown, the height of the valve core 200 in the axial direction of the second flow channel 120 is greater than the inner diameter of the first flow channel 110, and the diameter of the valve core outlet 212 is greater than or equal to the inner diameter of the first flow channel 110, so as to ensure that when the elastic return member 400 is in a stretched state and the valve core 200 moves to abut against the movable side wall 160 of the valve seat 100, and the second inlet 121 is connected to the first outlet 112, the valve core 200 can completely block the part of the first flow channel 110 corresponding to the first inlet 111, so as to ensure that the channel between the first inlet 111 and the first outlet 112 is closed; at the same time, the valve core outlet 212 can completely expose the first flow channel 110 corresponding to the first outlet 112, so as to ensure the smooth flow of the fluid from the second inlet 121 to the first outlet 112.

[0091] Based on the same inventive concept, an embodiment of the present application further provides a fuel cell system, which includes a fuel cell and the above-mentioned reversing valve 1000.

[0092] Since the fuel cell system provided by the present invention includes the reversing valve 1000 of the above technical solution, the fuel cell system provided by the present invention has all the beneficial effects of the above reversing valve 1000, which will not be elaborated here.

[0093] In some embodiments, Fig. 9 and Fig.10As shown, in the fuel cell system, the switch valve 01, the proportional valve 03, the ejector 04 and the anode reaction gas inlet 07 of the fuel cell stack 08 are connected in sequence through pipelines, the anode reaction gas outlet 09 of the fuel cell stack 08 is connected to the inlet of the gas-liquid separator 11 through a pipeline, the liquid discharge port and the nitrogen discharge port of the gas-liquid separator 11 are connected to the mixing device 15 through pipelines respectively, the exhaust port of the gas-liquid separator 11 is connected to the circulation pump 16, the reversing valve 1000 and the secondary flow inlet 05 of the ejector through the exhaust tee 12, and at the same time, the exhaust port of the gas-liquid separator 11 is connected to the reversing valve 1000 and the secondary flow inlet 05 of the ejector through the exhaust tee 12. Among them, a medium pressure sensor 02 is provided on the pipeline between the switch valve 01 and the proportional valve 03, a low pressure sensor for stack entry 06 is provided on the pipeline between the ejector 04 and the anode reaction gas stack entry 07, a low pressure sensor for stack exit 10 is provided on the pipeline between the anode reaction gas stack exit 09 and the gas-liquid separator 11, a water discharge valve 14 is provided on the pipeline between the liquid discharge port of the gas-liquid separator 11 and the mixing device 15, a nitrogen discharge valve 13 is provided on the pipeline between the nitrogen discharge port of the gas-liquid separator 11 and the mixing device 15, the exhaust port of the gas-liquid separator 11 is connected with the exhaust tee 12, the first tee outlet 19 of the exhaust tee 12 is directly connected with the first inlet 111 of the reversing valve 1000 through a pipeline, and the second tee outlet 20 of the exhaust tee 12 is connected with the circulation pump 16 and the second inlet 121 of the reversing valve 1000 through a pipeline.

[0094] When the fuel cell system is in a low-power working state, the anode metering is relatively high, and the ejector 04 ejection force is insufficient. It is necessary to rely on the circulation pump 16 to pressurize the circulating anode reaction gas. The flow path of the anode reaction gas is as follows: Fig. 9As shown in the direction of the middle arrow, the fresh anode reaction gas in the anode reaction gas source is reduced in pressure and passes through the switch valve 01, the proportional valve 03 and the ejector 04 in sequence. After being ejected by the high-speed nozzle of the ejector 04, it enters the fuel cell stack 08 through the anode reaction gas inlet 07 for electrochemical reaction. After the electrochemical reaction, the anode reaction gas is discharged through the anode reaction gas outlet 09, and then separated and removed by the gas-liquid separator 11 to remove gases such as liquid water and nitrogen. The separated anode reaction gas is divided into two anode reaction gas flow paths through the exhaust tee 12. One of the anode reaction gas flow paths is connected to the ejector 04 through the circulation pump 16 and the reversing valve 1000 in sequence, and the outlet of the circulation pump 16 is connected to the reversing valve 1000 through the second inlet 121. The anode reaction gas with a higher pressure output after being pressurized by the circulation pump 16 enters the reversing valve 1000 through the second inlet 121. The anode reaction gas pressure generated at the outlet of the circulation pump 16 is P idle, ensuring that P idle·S>F preload + kL. When the circulation pump 16 is idling, the anode reaction gas generated at the outlet of the circulation pump 16 can push the valve core 200 to move the valve core 200, so that the valve core outlet 212 is connected to the first outlet 112 correspondingly. At this time, the outlet pressure of the circulation pump 16 is ≥ P idle, the first inlet 111 is connected to the first outlet 112 through the valve core 200, and the first outlet 112 is connected to the secondary flow inlet 05 of the ejector. The circulating anode reaction gas pressurized by the circulation pump 16 enters the ejector 04 from the secondary flow inlet 05 of the ejector, and is driven by the high-speed ejection of the gas from the nozzle of the ejector 04. After being pressurized and mixed with the fresh anode reaction gas, it enters the stack 08 again through the anode reaction gas inlet 07 to participate in the electrochemical reaction. Among them, another anode reaction gas flow path is connected to the ejector 04 through the reversing valve 1000. Since the valve core 200 moves to the position where the valve core outlet 212 corresponds to the first outlet 112, the valve core 200 blocks the position where the first flow channel 110 corresponds to the first inlet 111. At this time, the first inlet 111 is disconnected from the first outlet 112.

[0095] When the fuel cell system is in a medium-high power working state, the anode metering is relatively small, and the ejector 04 can work alone to meet the circulating hydrogen pressurization requirements, so that the circulating pump 16 stops working to reduce the power consumption of the circulating pump 16. At this time, the valve core 200 is kept in a state of communication between the first inlet 111 and the first outlet 112 under the pre-tightening force of the elastic reset member 400, and the flow path of the anode reaction gas is as follows: Fig.10As shown in the direction of the middle arrow, the fresh anode reaction gas in the anode reaction gas source is reduced in pressure and passes through the switch valve 01, the proportional valve 03 and the ejector 04 in sequence. After being ejected by the high-speed nozzle of the ejector 04, it enters the fuel cell stack 08 through the anode reaction gas inlet 07 for electrochemical reaction. After the electrochemical reaction, the anode reaction gas is discharged through the anode reaction gas outlet 09, and then separated and removed by the gas-liquid separator 11 to remove gases such as liquid water and nitrogen. The separated anode reaction gas is divided into two anode reaction gas flow paths through the exhaust tee 12. One of the anode reaction gas flow paths is connected to the ejector 04 through the reversing valve 1000. Since the valve core 200 is kept in a connected state between the first inlet 111 and the first outlet 112 under the pre-tightening force of the elastic reset member 400, the circulating anode reaction gas directly enters the first flow channel 110 through the first inlet 111, and can flow into the secondary flow inlet 05 of the ejector through the first outlet 112. The gas is pressurized by the high-speed ejection of the nozzle of the ejector 04 and mixed with the fresh anode reaction gas. Then, it enters the fuel cell stack 08 again through the anode reaction gas inlet 07 to participate in the electrochemical reaction. The other anode reaction gas flow path is connected to the ejector 04 through the circulation pump 16 and the reversing valve 1000 in sequence, and the outlet of the circulation pump 16 is connected to the reversing valve 1000 through the second inlet 121. The circulation pump 16 stops working, so the anode reaction gas pressure at the second inlet 121 is less than the F preload force + Kl, and cannot push the valve core 200 to move relative to the valve seat 100. The valve core 200 remains in the initial state under the action of the elastic reset member 400, that is, the valve core outlet 212 is blocked by the inner wall of the second flow channel 120 and is not connected to the first outlet 112.

[0096] In the above embodiment, if Fig. 9 and Fig.10 As shown, the medium pressure sensor 02 is used to detect the anode reaction gas pressure at the front end of the proportional valve 03, the stack entry low pressure sensor 06 is used to detect the stack entry pressure of the anode reaction gas, the stack exit low pressure sensor 10 is used to detect the stack exit pressure of the anode reaction gas, the nitrogen discharge valve 13 is used to regularly discharge the impure reaction gas in the oxygen reaction gas pipeline, the water discharge valve 14 is used to regularly discharge the liquid water collected in the gas-liquid separator 11, and the discharged impure reaction gas and liquid water enter the mixing device 15 for discharge.

[0097] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may include that the first and second features are in direct contact, or may include that the first and second features are not in direct contact but are in contact through another feature between them. Moreover, a first feature being "above", "above" and "above" a second feature includes that the first feature is directly above and obliquely above the second feature, or simply indicates that the first feature is higher in level than the second feature. A first feature being "below", "below" and "below" a second feature includes that the first feature is directly below and obliquely below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0098] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise" and "counterclockwise" indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0099] It should be noted that all directional indications in the embodiments of the present application are only used to explain the relative position relationship, movement status, etc. between the components in a certain specific posture. If the specific posture changes, the directional indication will also change accordingly.

[0100] In this application, unless otherwise clearly specified and limited, the terms "connection", "fixation", etc. should be understood in a broad sense. For example, "fixation" can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements, unless otherwise clearly defined. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0101] In addition, the descriptions of "first", "second", etc. in this application are only for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" or "second" may explicitly or implicitly include one or more of the features. In the description of this application, the meaning of "plurality" is two or more, unless otherwise clearly and specifically defined.

[0102] Although the embodiments of the present application have been shown and described, those skilled in the art will appreciate that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present application, and that the scope of the present application is defined by the claims and their equivalents.

Claims

1. A reversing valve, characterized in that: The reversing valve comprises: A valve seat, wherein a first flow channel and a second flow channel connected to and perpendicular to the first flow channel are formed in the valve seat, a first inlet and a first outlet connected to the first flow channel are formed in the valve seat, and a second inlet connected to the second flow channel is formed in the valve seat; and, A valve core, wherein a third flow channel coaxial with the second flow channel is provided in the valve core, the valve core is provided with a valve core inlet and a valve core outlet communicated with the third flow channel, the setting position of the valve core inlet corresponds to the setting position of the second inlet, the valve core is movably arranged in the second flow channel so that the valve core outlet switches between a position corresponding to the first outlet and a position staggered from the first outlet, the valve core comprises a valve core side wall and a valve core top wall, the valve core side wall is surrounded by the valve core top wall to form a cylindrical structure with one end open, the opening in the cylindrical structure at a position opposite to the valve core top wall serves as the valve core inlet, and a through hole is provided on the valve core side wall as the valve core outlet; a fixing seat, the fixing seat being arranged in the second flow channel, the fixing seat being provided with a through hole corresponding to the second inlet; and An elastic return member, wherein the elastic return member is connected between the valve core and the fixed seat, and the elastic return member maintains the valve core outlet at a position staggered from the first outlet through a pre-tightening force; by selecting an elastic return member with suitable stiffness and pre-tightening force to design the conditions for the movement of the valve core relative to the valve seat, the valve core automatically switches the position of the valve core outlet in the valve seat according to the pressure to switch the conductance between the first flow channel and the second flow channel.

2. The reversing valve according to claim 1, characterized in that: The reversing valve further includes a retaining spring; the second flow channel is provided with a retaining spring groove, the retaining spring groove is located between the fixing seat and the valve core, and the retaining spring groove is used to accommodate the retaining spring.

3. The reversing valve according to claim 2, characterized in that: An anti-slip retaining ring is arranged in the second flow channel, and the anti-slip retaining ring is located on a side of the fixing seat opposite to the retaining ring groove.

4. The reversing valve according to claim 1, characterized in that: A buffer pad is provided on the inner side of the side wall of the valve seat corresponding to the second inlet.

5. The reversing valve according to claim 1, characterized in that: A side wall of the valve seat corresponding to the second inlet is a movable side wall, and the movable side wall is detachably arranged on the valve seat.

6. The reversing valve according to any one of claims 1 to 5, characterized in that: The valve seat is provided with a limit pin, and the valve core is provided with a positioning groove matching the limit pin; and / or, the valve seat is provided with a limit groove, and the valve core is provided with a positioning pin matching the limit groove.

7. The reversing valve according to claim 6, characterized in that: The second flow channel is provided with a limit pin hole, and the limit pin is connected with the limit pin hole by interference fit.

8. The reversing valve according to claim 6, characterized in that: The length of the limiting groove and / or the positioning groove is greater than or equal to the moving distance of the valve core relative to the second flow channel.

9. A fuel cell system, characterized in that: The fuel cell system comprises a fuel cell and a reversing valve as claimed in any one of claims 1 to 8.

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