Solenoid valve for fuel cell

Abstract

The utility model discloses a solenoid valve for a fuel cell, which includes a valve housing with a receiving cavity, a valve block located in the receiving cavity, an electromagnetic assembly located on one side of the valve block and at least partially located in the receiving cavity, an inlet joint arranged at the inlet end of the valve block, and an outlet joint arranged at the outlet end of the valve block, wherein the valve block includes an entry hole that at least partially receives the inlet joint, an entry channel connected to the entry hole, and a diaphragm groove located outside the entry channel, and the electromagnetic assembly includes a diaphragm module arranged adjacent to the entry channel, wherein the diaphragm module includes a diaphragm center portion that can be sealed with the outlet end of the entry channel, and a diaphragm edge portion located outside the diaphragm center portion and at least partially received by the diaphragm groove. The utility model meets the extreme working conditions of high and low temperatures, and can fully absorb the deformation of the diaphragm during stretching and compression, thereby improving the durability of the diaphragm and the entire valve, and ultimately effectively improving the service life of the entire valve.

Description

Technical Field

[0001] The utility model relates to the technical field of valves, in particular to a solenoid valve for a fuel cell. Background Art

[0002] With the development of the world economy, energy and environmental issues are becoming the focus of attention of all countries, and are gradually becoming a hot spot for technical research in the field of power systems. Fuel cell technology, as a clean and efficient energy conversion device, generates electricity through the chemical reaction of hydrogen and oxygen, which is used in various fields of production and life. Its only byproduct is water, which is a clean technology in today's society. However, at present, the application of fuel cell technology is not widespread enough. The main reason is that there are still many technical difficulties in fuel cell technology that have not been completely broken through, and the production and manufacturing costs are high. The control of the hydrogen circulation system is one of them. The solenoid valve is used on the fuel cell engine to control the on and off of the hydrogen supply and flow regulation, so the performance of the solenoid valve is directly related to the performance of the fuel cell engine.

[0003] Since fuel cells produce waste water and waste gas during operation, a water vapor separation device is usually used to separate the steam-water mixture produced by the fuel cell system, and then the waste water is discharged through the drain solenoid valve switch. In addition, the waste gas and waste water produced by the fuel cell system will change with the change of working conditions, so the exhaust solenoid valve and the drain solenoid valve need to be frequently switched on and off and for a long time. The responsiveness and durability of the solenoid valve are crucial to the fuel cell engine system. In addition, the working environment of the fuel cell engine must take into account the changes in the external temperature, especially in the low temperature environment in winter. The waste water produced by the fuel cell engine will freeze, thereby blocking the valve port and making it impossible to drain. When the water level is too high, it will submerge the stack and cause the fuel cell engine to fail. Therefore, it is necessary to design a heating device on the drain solenoid valve to thaw the frozen waste water so that the system can restore the drainage function.

[0004] In summary, the existing solenoid valves for fuel cells have the following disadvantages:

[0005] 1) Its adaptability to the ambient temperature range is not wide enough. At extremely high temperatures, the solenoid valve cannot be opened. The fundamental reason is that the electromagnetic force is low or the key internal parts are deformed due to high temperature. At the same time, at extremely low temperatures, the solenoid valve cannot be opened. The reasons include the internal residual water freezing at low temperatures, the sealing valve block and the valve seat freezing together; the sealing diaphragm hardens at low temperatures, the valve movement resistance increases, and the valve cannot be opened;

[0006] 2) The voltage requirement range of the power supply is not wide enough, and there is a problem that the solenoid valve cannot be opened at extremely low voltage;

[0007] 3) The noise level is high, especially when used in passenger cars, which seriously affects the comfort of passengers;

[0008] 4) Durability cannot meet the requirements of the vehicle, mainly due to wear of key internal moving parts and damage of the valve block soft sealing material during durability;

[0009] 5) When the exhaust port pressure rises abnormally, the solenoid valve may open abnormally and leakage may increase.

[0010] Therefore, it is necessary to improve the existing solenoid valve for fuel cells. Utility Model Content

[0011] In order to solve the above-mentioned technical problems, the purpose of the utility model is to provide a solenoid valve for a fuel cell that meets the extreme working conditions of high and low temperatures, ensures the normal operation of the product at high temperatures, improves the stability of the product, greatly widens the fluctuation range of the power supply voltage, and improves the design robustness of the drainage solenoid valve. It can fully absorb the deformation of the diaphragm during stretching and compression, thereby improving the durability of the diaphragm and the entire valve, and ultimately effectively improving the service life of the entire valve.

[0012] To achieve the purpose of the utility model, the utility model provides the following technical solutions: a solenoid valve for a fuel cell, comprising a valve housing having a receiving cavity, a valve block located in the receiving cavity, an electromagnetic assembly located on one side of the valve block and at least partially located in the receiving cavity, an inlet joint arranged at the inlet end of the valve block, and an outlet joint arranged at the outlet end of the valve block, wherein the valve block comprises an inlet hole that at least partially receives the inlet joint, an inlet channel whose one end is connected to the inlet hole, and a diaphragm groove located outside the inlet channel, and the electromagnetic assembly comprises a diaphragm module arranged adjacent to the other end of the inlet channel, wherein the diaphragm module comprises a diaphragm center portion that can be sealed with the outlet end of the inlet channel, and a diaphragm edge portion that is located outside the diaphragm center portion and is at least partially received by the diaphragm groove.

[0013] On the basis of the above technical solution, the following subsidiary technical solutions are further included:

[0014] The outlet end of the inlet channel is provided with a mating surface which is sealed with the center part of the diaphragm, and a coating arranged on the mating surface, wherein the coating can reduce friction, thereby reducing the driving electromagnetic force, and can effectively improve durability and reliability.

[0015] The outlet end of the inlet channel is provided with a mating surface that seals with the center of the diaphragm, wherein the mating surface is sandblasted or anodized to have the function of preventing adhesion, especially at low temperatures, effectively preventing ice adhesion caused by condensation of water vapor, thereby improving the working stability of the solenoid valve.

[0016] The coating is a polymer material, which effectively prevents mutual adhesion during matching and more effectively prevents ice adhesion caused by condensation of water vapor, thereby improving the working durability of the solenoid valve.

[0017] The coating is Teflon, which effectively prevents mutual adhesion during matching and more effectively prevents ice adhesion caused by condensation of water vapor, thereby improving the working durability of the solenoid valve.

[0018] A one-way valve is arranged inside the outlet joint, which effectively solves the problem of insufficient reverse pressure resistance of the current diaphragm solenoid valve. When abnormal pressure fluctuation occurs, the one-way valve remains closed, effectively filtering out the abnormal pressure wave, thereby ensuring that when abnormal pressure fluctuation occurs at the outlet pressure, the solenoid valve always remains closed to avoid the problem of abnormal opening.

[0019] The valve block includes a valve block cavity connected to both the inlet channel and the diaphragm groove, and a matching side wall arranged adjacent to the diaphragm groove, wherein the diaphragm module includes a diaphragm outer recess located between the diaphragm center and the diaphragm edge and at least partially accommodating the matching side wall.

[0020] The diaphragm module includes a diaphragm abutting surface on the side corresponding to the diaphragm outer concave portion, a diaphragm convex portion located between the diaphragm center portion and the diaphragm outer concave portion, a diaphragm inner concave portion located between the diaphragm center portion and the diaphragm convex portion, and a diaphragm fixing portion located inside the diaphragm center portion.

[0021] The electromagnetic assembly includes a coil housing, an armature connected to a diaphragm fixing portion at one end, an armature spring having one end providing a rebound force to the armature, a magnetic pole column connected to the other end of the armature spring, and an induction coil arranged on the outside of the armature and located on the inside of the coil housing, wherein the diaphragm module is located on the outside of the coil housing, and the diaphragm abutting surface is in abutting contact with the coil housing.

[0022] It also includes a first sealing ring sleeved on the outside of the inlet joint, a second sealing ring sleeved on the outside of the inlet joint and sealed with the valve housing, a third sealing ring sleeved on the outside of the inlet joint and sealed with the inlet hole, a cover plate that together with the valve housing seals the accommodating cavity, a sealing gasket arranged between the valve housing and the cover plate, a heating plate located on one side of the valve block and in the accommodating cavity, a fourth sealing ring sleeved on the outside of the outlet joint and sealed with the valve housing, and a fifth sealing ring sleeved on the outside of the outlet joint and sealed with the valve block, wherein the cover plate is arranged around the magnetic pole column to perform sealing to ensure reliable operation.

[0023] Compared with the prior art, the utility model has the following beneficial effects: it meets the harsh working conditions of high temperature, solves the softening and deformation problems of the diaphragm and the attenuation of the electromagnetic force at high temperature, ensures the normal operation of the product at high temperature, and improves the stability of the product; at the same time, it also reduces the deformation resistance of the diaphragm module when the solenoid valve is switched at extremely low temperatures, reduces the requirements for the electromagnetic force, and thus greatly widens the fluctuation range of the power supply voltage under the condition that the electromagnetic force remains unchanged, and improves the design robustness of the drainage solenoid valve. In addition, the diaphragm module with a wave-shaped structure can fully absorb the deformation of the diaphragm during stretching and compression, thereby improving the durability of the diaphragm and the entire valve, and ultimately effectively improving the service life of the entire valve. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The accompanying drawings are used to provide a further understanding of the present invention and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention and do not constitute a limitation of the present invention. In the accompanying drawings:

[0025] Figure 1 It is a three-dimensional diagram of the utility model;

[0026] Figure 2 It is a cross-sectional view of the utility model at one viewing angle;

[0027] Figure 3 is a cross-sectional view of the utility model at another viewing angle;

[0028] Figure 4 It is a cross-sectional view of the valve block in the utility model;

[0029] Figure 5 This is the front view of the valve block in the utility model;

[0030] Figure 6 It is the front view of the armature in the utility model;

[0031] Figure 7 is a cross-sectional view of a first embodiment of the diaphragm module of the utility model;

[0032] Figure 8 It is a cross-sectional view of the second embodiment of the diaphragm module in the utility model. DETAILED DESCRIPTION

[0033] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further described below in conjunction with specific implementation methods.

[0034] like Figure 1-8As shown, the utility model provides a specific embodiment of a solenoid valve for a fuel cell, which includes a valve housing 1000 having a receiving cavity 1200, a valve block 3000 located in the receiving cavity 1200, a cover plate 2000 that seals the receiving cavity 1200 together with the valve housing 1000, an electromagnetic assembly 4000 located on one side of the valve block 3000 and at least partially located in the receiving cavity 1200, an inlet joint 5000 arranged at the inlet end of the valve block 3000, an outlet joint 5400 arranged at the outlet end of the valve block 3000, a first sealing ring 6000 sleeved on the outside of the inlet joint 5000, and a valve block 5400 sleeved on the outside of the valve block 3000. A second sealing ring 6200 which is mounted on the outside of the inlet joint 5000 and sealed with the valve housing 1000, a third sealing ring 6400 which is mounted on the outside of the inlet joint 5000 and sealed with the inlet hole 3600, a sealing gasket 6600 which is arranged between the valve housing 1000 and the cover plate 2000, a fourth sealing ring 6700 which is mounted on the outside of the outlet joint 5400 and sealed with the valve housing 1000, a fifth sealing ring 6800 which is mounted on the outside of the outlet joint 5400 and sealed with the valve block 3000, and a heating plate 7000 which is located on one side of the valve block 3000 and in the accommodating cavity 1200.

[0035] The valve housing 1000 is roughly rectangular and made of plastic material, and its interior is a receiving cavity 1200 with an open end, and the open end is covered by a cover plate 2000 .

[0036] The cover plate 2000 is substantially rectangular and made of plastic material, and is used to close one end of the electromagnetic assembly 4000. The valve housing 1000 and the cover plate 2000 are sealed by a sealing gasket 6600.

[0037] The valve block 3000 includes an inlet hole 3600 that at least partially accommodates the inlet connector 5000, an inlet channel 3640 that is connected to the inlet hole 3600, a diaphragm groove 3440 located outside the inlet channel 3640, a valve block cavity 3400 that is connected to both the inlet channel 3640 and the diaphragm groove 3440, and a matching side wall 3460 that is disposed adjacent to the diaphragm groove 3440. The outlet end of the inlet channel 3640 is provided with a matching surface 3644 that is sealed and matched with the diaphragm center portion 4920, and a coating 3646 disposed on the matching surface 3644. The coating 3646 is a polymer material, not limited to a Teflon coating. The coating 3646 is located around the sealing area of ​​the valve block and is applied around the inlet channel 3640, thereby effectively preventing mutual adhesion during matching, and more effectively preventing ice adhesion caused by condensation of water vapor, thereby improving the working durability of the solenoid valve. A special polymer coating is added to the surface of the valve block 3000, and the coating is not limited to a Teflon coating. In another embodiment, the mating surface 3644 is sandblasted or anodized to prevent adhesion, and can effectively prevent ice adhesion caused by condensation of water vapor, especially at low temperatures, thereby improving the durability of the solenoid valve.

[0038] The electromagnetic assembly 4000 includes a coil housing, an armature 4400 connected to a diaphragm fixing portion 4930 at one end, an armature spring 4600 providing a rebound force to the armature 4400 at one end, a magnetic pole column portion 4200 connected to the other end of the armature spring 4600, an induction coil 4800 arranged outside the armature 4400 and inside the coil housing, and a diaphragm module 4900 arranged adjacent to the entry channel 3640. The induction coil 4800 is assembled inside the coil housing, and the magnetic pole column portion 4200 is press-fitted on the coil housing by interference fit, thereby enclosing the induction coil 4800 inside the coil housing. An armature spring 4600 is assembled between the armature 4400 and the magnetic pole column portion 4200, and the armature spring 4600 is always in a compressed state. The armature 4400 is generally cylindrical, and includes an armature end face 8420 disposed adjacent to the magnetic pole column 4200, an armature oblique cone surface 8440 surrounding the armature end face 8420 at one end, a magnetic isolation sheet 8460 disposed adjacent to the other end of the armature oblique cone surface 8440, and a spring hole 8480 located at the center of the armature end face 8420 and accommodating the armature spring 4600. The angle and height of the armature oblique cone surface 8440 can improve the electromagnetic force of the electromagnetic valve at the closed position. The diaphragm module 4900 includes a diaphragm center portion 4920 that can be sealed with the outlet end of the inlet channel 3640, a diaphragm edge portion 4990 located outside the diaphragm center portion 4920 and at least partially received by the diaphragm groove 3440 and axially protruding, a diaphragm outer recess 4970 located between the diaphragm center portion 4920 and the diaphragm edge portion 4990 and at least partially receiving the matching side wall 3460, a diaphragm abutment surface 4980 on the side corresponding to the diaphragm outer recess 4970, a diaphragm protrusion 4960 located between the diaphragm center portion 4920 and the diaphragm outer recess 4970, a diaphragm inner recess 4940 located between the diaphragm center portion 4920 and the diaphragm protrusion 4960, and a diaphragm fixing portion 4930 located inside the diaphragm center portion 4920 and connected to the armature 4400. The diaphragm fixing portion 4930 is preferably a screw. The diaphragm module 4900 is located on the outside of the coil housing, and the diaphragm abutment surface 4980 is in abutment contact with the coil housing. The armature 4400 and the diaphragm module 4900 are mounted together by screws. In the diaphragm module 4900, the center portion 4920 of the diaphragm is vulcanized to encapsulate the screw head inside. The cover plate 2000 is arranged around the magnetic pole column portion 4200. After the entire electromagnetic assembly is assembled, the electromagnetic assembly 4000 is pressed onto the valve block 3000, and the edge portion 4990 of the diaphragm enters the diaphragm groove 3440 on the valve block 3000 to abut against it, and the matching side wall 3460 enters the outer recess 4970 of the diaphragm to closely contact, so as to achieve the sealing of the valve block part and the electromagnetic part. When the valve is closed, the coating 3646 is located between the center portion 4920 of the diaphragm and the metal surface of the valve block 3000, effectively preventing the adhesion of the two.When the solenoid valve is in the normally closed state, the center portion 4920 of the diaphragm is pressed on the valve block 3000 by the armature spring 4600 through the armature 4400, and the edge portion 4990 of the diaphragm is deformed naturally, especially the wave-shaped undulating position of the diaphragm protrusion 4960 is stretched into a straight line, which greatly reduces the obvious deformation stress of the diaphragm rubber material; when the solenoid valve is energized and the valve is opened, the diaphragm is pulled up, and the diaphragm protrusion 4960 has a pre-deformation, which can greatly reduce the deformation resistance of the diaphragm. The diaphragm module 4900 uses special polymer materials, including but not limited to ethylene propylene diene monomer rubber (EPDM) and fluororubber (FKM).

[0039] The inlet joint 5000 is connected to the top of the valve block 3000 by threading, the first sealing ring 6000 is used to connect the client, the second sealing ring 6200 is used to radially seal the inlet joint 5000 and the valve housing 1000, and the third sealing ring 64000 is used to seal the bottom of the inlet joint 5000 and the valve block 3000. The outlet joint 5400 is connected to the bottom of the valve block 3000 by threading, the fourth sealing ring 6700 is used to radially seal the inlet joint 5000 and the valve housing 1000, and the fifth sealing ring 6800 is used to seal the bottom of the inlet joint 5000 and the valve block 3000. A check valve 5600 is arranged inside the outlet joint 5400. When the solenoid valve is opened to drain or exhaust, the check valve 5600 is opened; when the solenoid valve is closed and the pressure of the outlet joint 5400 increases abnormally, the check valve 5600 is cut off, the abnormal pressure is limited outside the check valve 5600, and the solenoid valve remains closed. The one-way valve 5600 can be assembled with the outlet connector, or can be a separate component and assembled inside the outlet connector. The structure of the one-way valve 5600 is not limited to the spring structure shown in the figure, and can be a spring-free sheet structure.

[0040] The heating plate 7000 is preferably a positive temperature coefficient thermistor (PTC) heating plate.

[0041] like Figure 8 As shown, the utility model also provides another embodiment of the diaphragm module, which includes a diaphragm center portion 8200 that can be sealed with the outlet end of the inlet channel 3640, a diaphragm recess 8220 located outside the diaphragm center portion 8200, a diaphragm edge portion 8240 located outside the diaphragm recess 8220, and a diaphragm fixing portion 8260 that is plastic-coated with the diaphragm center portion 8200 at one end and connected to the armature 4400 at the other end. Both the diaphragm recess 8220 and the diaphragm edge portion 8240 cooperate with the corresponding structure of the valve block 3000.

[0042] The working principle of the utility model is as follows:

[0043] In the initial position, the armature 4400 is in the valve closing position under the action of the armature spring 4600, and the spring preload force ensures that the diaphragm module 4900 fits tightly with the valve block 3000 to achieve the sealing of the valve block position. When the power is on, the electromagnetic force drives the armature 4400 to overcome the spring force and move toward the magnetic pole column 4200. At the same time, the armature 4400 drives the diaphragm module 4900 to move away from the valve block 3000, and the diaphragm module 4900 is separated from the valve block 3000, and the valve is opened. The water and exhaust gas in the inlet connector 5000 and the flow channel flow out from the inlet channel 3640 and are discharged to the outside through the outlet connector 5400, thereby realizing the drainage and exhaust function.

[0044] Regardless of whether the valve is open or closed, the diaphragm edge 4990 and the diaphragm protrusion 4960 are always pressed between the valve block 3000 and the electric coil housing, and the edge of the diaphragm is deformed, thereby sealing the fluid part and the electromagnetic part of the solenoid valve.

[0045] In actual use, the valve needs to be frequently switched on and off, and the responsiveness and durability of the valve are required to be relatively high. Since there are no extra resistance components between the armature and the diaphragm module, the switch response is faster. In addition, the armature is assembled inside the sleeve, which also serves as a guide. The armature surface coating can reduce friction, thereby reducing the driving electromagnetic force and effectively improving durability and reliability. At low temperatures, the special shape of the diaphragm can effectively reduce the movement resistance of the diaphragm deformation when the valve is switched, thereby solving the problem of the valve being unable to open at extremely low temperatures.

[0046] After adopting the above technical solution, this embodiment has the following benefits:

[0047] 1) The seal adopts a diaphragm made of special materials, which can meet the harsh working conditions of high and low temperatures, solve the problem of softening and deformation of the diaphragm at high temperatures, and further effectively solve the attenuation problem of the electromagnetic force of the solenoid valve caused by the increase of air gap at high temperatures, ensure the normal operation of the product at high temperatures, and improve the stability of the product.

[0048] 2) The wavy diaphragm in this embodiment greatly reduces the deformation resistance of the diaphragm when the solenoid valve is switched under extremely low temperatures, ensuring that the diaphragm does not harden under low temperature conditions, thereby effectively reducing the movement resistance of the valve and solving the problem that the low-temperature solenoid valve cannot be opened. While the electromagnetic force remains unchanged, the fluctuation range of the power supply voltage is greatly widened, thereby improving the design robustness of the drainage solenoid valve; when the valve is switched, the wavy structure of the diaphragm can fully absorb the deformation of the diaphragm during stretching and compression, thereby improving the durability of the diaphragm and the entire valve, and ultimately effectively increasing the service life of the entire valve.

[0049] 3) The conical structure of the magnetic isolation plate, armature and static armature optimizes the electromagnetic force curve, effectively increases the electromagnetic force of the electromagnetic valve when the large air gap is large, thereby reducing the requirements for the size of the electromagnetic coil, which helps to reduce costs and save space. At the same time, it effectively reduces the impact noise when the solenoid valve is opened, which plays an important role in improving the NVH level of the whole vehicle and improving comfort;

[0050] 4) The special coating designed in the sealing area of ​​the valve block has the function of preventing adhesion, especially at low temperatures, effectively preventing ice adhesion caused by condensation of water vapor, improving the working stability of the solenoid valve, and the special coating designed on the surface of the armature has a self-lubricating effect, which can greatly improve the wear resistance of the armature in a dry friction environment, thereby greatly increasing the service life of the entire valve.

[0051] 5) The mating surfaces in the valve block sealing area are sandblasted or anodized to prevent mutual adhesion during mating, and more effectively prevent ice adhesion caused by condensation of water vapor, thereby improving the working durability of the solenoid valve.

[0052] 6) A one-way valve is designed at the outlet joint, which can effectively solve the problem of insufficient reverse pressure resistance of the current diaphragm solenoid valve. When abnormal pressure fluctuations occur, the one-way valve remains closed, effectively filtering out the abnormal pressure waves, thereby ensuring that when abnormal pressure fluctuations occur at the outlet pressure, the solenoid valve always remains closed to avoid abnormal opening problems.

[0053] The above shows and describes the basic principle and main features of the utility model and the advantages of the utility model. Those skilled in the art should understand that the utility model is not limited by the above embodiments. The above embodiments and descriptions are only for explaining the principle of the utility model. Without departing from the spirit and scope of the utility model, the utility model may have various changes and improvements, which fall within the scope of the utility model to be protected. The scope of protection claimed by the utility model is defined by the attached claims and their equivalents.

Claims

1. A solenoid valve for a fuel cell, characterized in that It includes: A valve housing (1000) having a receiving cavity (1200), a valve block (3000) located in the receiving cavity (1200), an electromagnetic assembly (4000) located on one side of the valve block (3000) and at least partially located in the receiving cavity (1200), an inlet connector (5000) arranged at the inlet end of the valve block (3000), and an outlet connector (5400) arranged at the outlet end of the valve block (3000), wherein the valve block (3000) comprises an inlet hole (3600) for at least partially receiving the inlet connector (5000), and an outlet connector (5400) at one end and a valve block (3000) disposed at the outlet end of the valve block (3000). (3600), and a diaphragm groove (3440) located around the entry channel (3640), and the electromagnetic component (4000) includes a diaphragm module (4900) arranged adjacent to the other end of the entry channel (3640), wherein the diaphragm module (4900) includes a diaphragm center portion (4920) that can be sealed with the outlet end of the entry channel (3640), and a diaphragm edge portion (4990) located outside the diaphragm center portion (4920) and at least partially received by the diaphragm groove (3440).

2. A solenoid valve for a fuel cell according to claim 1, characterized in that: The outlet end of the inlet channel (3640) is provided with a mating surface (3644) that is sealed with the central portion (4920) of the diaphragm, and a coating (3646) that is provided on the mating surface (3644).

3. The solenoid valve for a fuel cell according to claim 1, characterized in that: The outlet end of the inlet channel (3640) is provided with a mating surface (3644) which is sealed with the central part (4920) of the diaphragm, wherein the mating surface (3644) is sandblasted or anodized.

4. A solenoid valve for a fuel cell according to claim 2, characterized in that: The coating (3646) is a polymer material.

5. A solenoid valve for a fuel cell according to claim 2, characterized in that: The coating (3646) is Teflon.

6. A solenoid valve for a fuel cell according to claim 1, characterized in that: A one-way valve (5600) is disposed inside the outlet connector (5400).

7. A solenoid valve for a fuel cell according to claim 1, characterized in that: The valve block (3000) includes a valve block cavity (3400) connected to both the inlet channel (3640) and the diaphragm groove (3440), and a matching side wall (3460) located on the inner side of the diaphragm groove (3440), wherein the diaphragm module (4900) includes a diaphragm outer recess (4970) located between the diaphragm center portion (4920) and the diaphragm edge portion (4990) and at least partially accommodating the matching side wall (3460).

8. The solenoid valve for a fuel cell according to claim 2, characterized in that: The diaphragm module (4900) includes a diaphragm abutment surface (4980) on the side corresponding to the diaphragm outer recess (4970), a diaphragm protrusion (4960) located between the diaphragm center (4920) and the diaphragm outer recess (4970), a diaphragm inner recess (4940) located between the diaphragm center (4920) and the diaphragm protrusion (4960), and a diaphragm fixing portion (4930) located on the inner side of the diaphragm center (4920).

9. A solenoid valve for a fuel cell according to claim 8, characterized in that: The electromagnetic assembly (4000) includes a coil housing, an armature (4400) having one end connected to a diaphragm fixing portion (4930), an armature spring (4600) having one end providing a rebound force to the armature (4400), a magnetic pole column portion (4200) connected to the other end of the armature spring (4600), and an induction coil (4800) arranged outside the armature (4400) and located inside the coil housing, wherein the diaphragm module (4900) is located outside the coil housing, and the diaphragm abutment surface (4980) is in abutment contact with the coil housing.

10. A solenoid valve for a fuel cell according to claim 1, 2, 3 or 4, characterized in that The valve body also includes a first sealing ring (6000) sleeved on the outside of the inlet joint (5000), a second sealing ring (6200) sleeved on the outside of the inlet joint (5000) and sealed with the valve housing (1000), a third sealing ring (6400) sleeved on the outside of the inlet joint (5000) and sealed with the inlet hole (3600), a cover plate (2000) that together with the valve housing (1000) seals the accommodating cavity (1200), and a sealing member (2000) disposed between the valve housing (1000) and the cover plate ( The cover plate (2000) is provided with a sealing gasket (6600) between the valve block (2000), a heating plate (7000) on one side of the valve block (3000) and located in the accommodating cavity (1200), a fourth sealing ring (6700) sleeved on the outside of the outlet joint (5400) and sealed with the valve housing (1000), and a fifth sealing ring (6800) sleeved on the outside of the outlet joint (5400) and sealed with the valve block (3000), wherein the cover plate (2000) is provided around the magnetic pole column portion (4200).

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