Hydrogen injection valve for fuel cell hydrogen circulation system and fuel cell hydrogen circulation system

Abstract

The present invention belongs to the technical field of fuel cells, and discloses a hydrogen injection valve for a fuel cell hydrogen circulation system and a fuel cell hydrogen circulation system. The hydrogen injection valve for a fuel cell hydrogen circulation system comprises a shell, a nozzle and a push block. The nozzle is arranged at one end of the shell and communicated with the interior of the shell through a connecting port. The shell is sleeved on the outer periphery of the push block. The gap between the push block and the nozzle is communicated with the hydrogen flow inlet of the shell. The push block can move along the axial direction of the nozzle, and a probe is fixedly connected to the push block. The probe is coaxially arranged with the nozzle, and part of the probe can pass through the connecting port and be located in the nozzle. An adjusting part is arranged at one end of the probe away from the push block, and the diameter of the cross section of the adjusting part gradually decreases from the side close to the push block to the side away from the push block, and the adjusting part can pass through the nozzle of the nozzle. The present invention can ensure that the flow rate of hydrogen is adapted to the hydrogen flow entering the ejector, thereby ensuring that the fuel cell hydrogen circulation system always maintains the maximum working efficiency.

Description

Technical Field

[0001] The present invention relates to the technical field of fuel cells, and in particular to a hydrogen injection valve for a fuel cell hydrogen circulation system and a fuel cell hydrogen circulation system. Background Art

[0002] The fuel cell hydrogen circulation system can improve the utilization rate of hydrogen. At the same time, the hydrogen circulation can also improve the water balance in the fuel cell stack to avoid flooding in the fuel cell stack and improve the working efficiency of the fuel cell stack.

[0003] The fuel cell hydrogen circulation system generally includes a hydrogen injection valve, and hydrogen can be sprayed from the nozzle of the hydrogen injection valve. The cross-sectional area of ​​the nozzle of the conventional hydrogen injection valve is determined at the beginning of the design, so that the cross-sectional area of ​​the gas path for circulating hydrogen at the nozzle of the nozzle cannot be adjusted. When the fuel cell hydrogen circulation system works according to the working conditions simulated during the design, the fuel cell hydrogen circulation system can achieve maximum working efficiency, but when the actual working conditions of the fuel cell hydrogen circulation system are different from the working conditions simulated during the design, the cross-sectional area of ​​the nozzle cannot be adjusted, resulting in a significant decrease in the working efficiency of the fuel cell hydrogen circulation system. Specifically, when the stack is at a low power output or the amount of hydrogen required for the reaction is very small, the hydrogen flow rate entering the ejector from the hydrogen storage bottle will also decrease. Since the cross-sectional area of ​​the gas path for circulating hydrogen at the nozzle of the nozzle has not changed, the flow rate of the hydrogen flowing out of the nozzle decreases, thereby causing the ejection performance of the ejector to decrease or even have no ejection effect, thereby causing a significant decrease in the working efficiency of the fuel cell hydrogen circulation system.

[0004] Therefore, the above problems need to be solved urgently. Summary of the invention

[0005] The object of the present invention is to provide a hydrogen injection valve for a fuel cell hydrogen circulation system and a fuel cell hydrogen circulation system to solve the problem that the working efficiency of the fuel cell hydrogen circulation system is greatly reduced due to the cross-sectional area of ​​the gas path for circulating hydrogen located at the nozzle outlet cannot be adjusted.

[0006] To achieve this object, the present invention adopts the following technical solutions:

[0007] In one aspect, the present invention provides a hydrogen injection valve for a fuel cell hydrogen circulation system, comprising:

[0008] The shell is provided with a hydrogen flow inlet;

[0009] A nozzle is disposed at one end of the shell and communicated with the interior of the shell through a communication port, and a nozzle is disposed at one end of the nozzle away from the shell; and

[0010] A push block, wherein the shell is sleeved on the outer circumference of the push block, the gap between the push block and the nozzle is communicated with the hydrogen flow inlet, the push block can move along the axial direction of the nozzle, and a probe is fixedly connected to the push block, the probe is coaxially arranged with the nozzle, and part of the probe can pass through the communicating port and be located in the nozzle, an adjusting part is arranged at one end of the probe away from the push block, the diameter of the cross section of the adjusting part gradually decreases from a side close to the push block to a side away from the push block, and the adjusting part can pass through the nozzle of the nozzle.

[0011] Preferably, the hydrogen injection valve for a fuel cell hydrogen circulation system further comprises a driving structure, and the driving structure is configured to drive the push block to move along the axial direction of the nozzle.

[0012] Preferably, the push block is magnetic, and the driving structure comprises:

[0013] an electromagnet, disposed on a side of the push block away from the probe; and

[0014] The reset member is configured to reset the push block when the magnetism of the electromagnet weakens.

[0015] Preferably, the electromagnet can generate the same magnetism as the push block, so as to generate a thrust force on the push block capable of pushing the push block to move toward the nozzle.

[0016] Preferably, the reset member is a reset spring, which can be elastically deformed when the push block is pushed by the electromagnet, so as to have elastic potential energy for resetting the push block when the thrust generated by the electromagnet on the push block decreases.

[0017] Preferably, the electromagnet can generate magnetism opposite to that of the push block, so as to generate a pulling force on the push block capable of pulling the push block away from the nozzle.

[0018] Preferably, the push block and the housing are sealed.

[0019] Preferably, a flow valve is fixedly provided inside the shell, the flow valve is located between the push block and the nozzle, and is sleeved on the outer periphery of the probe, and a flow channel is provided on the flow valve, and the flow channel connects the gap between the push block and the flow valve and the connecting port.

[0020] Preferably, the hydrogen injection valve for a fuel cell hydrogen circulation system further comprises a limiting structure, and the limiting structure is configured to limit the position of the push block along the axial direction of the nozzle.

[0021] Preferably, the limiting structure includes a first protrusion and a second protrusion, the first protrusion is formed at an end of the push block away from the probe, and the second protrusion is formed inside the shell, and when the push block moves toward the nozzle, the first protrusion can abut against the second protrusion.

[0022] On the other hand, the present invention also provides a fuel cell hydrogen circulation system, which includes an ejector tube and a hydrogen injection valve for the fuel cell hydrogen circulation system as described above, wherein the end of the nozzle away from the shell can extend into the ejector tube through an opening at the end of the ejector tube.

[0023] Beneficial effects of the present invention: In the present invention, the hydrogen flow inlet, the gap between the push block and the nozzle, the inside of the nozzle and the nozzle together constitute a gas path for the hydrogen flow. The present invention adjusts the cross-sectional area of ​​the nozzle through the adjustment part of the probe. When the hydrogen flow rate entering the ejector decreases, the cross-sectional area of ​​the nozzle decreases. When the hydrogen flow rate entering the ejector increases, the cross-sectional area of ​​the nozzle increases, thereby ensuring that the flow rate of hydrogen is compatible with the hydrogen flow rate entering the ejector, thereby ensuring that the fuel cell hydrogen circulation system always maintains maximum working efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 is a schematic structural diagram of a fuel cell hydrogen circulation system in an embodiment of the present invention;

[0025] Figure 2 yes Figure 1 A local enlarged view of point A in the figure.

[0026] In the figure:

[0027] 110, housing; 111, hydrogen flow inlet; 112, flow valve; 1121, flow channel;

[0028] 120, nozzle; 121, communication port; 122, nozzle;

[0029] 130, push block; 131, third protrusion;

[0030] 140. probe; 141. adjustment unit;

[0031] 151. electromagnet; 152. reset member;

[0032] 160, limiting structure; 161, first protruding portion; 162, second protruding portion;

[0033] 200. Ejector tube. DETAILED DESCRIPTION

[0034] The present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It is to be understood that the specific embodiments described herein are only used to explain the present invention, rather than to limit the present invention. It should also be noted that, for ease of description, only parts related to the present invention, rather than all structures, are shown in the accompanying drawings.

[0035] In the description of the present invention, unless otherwise clearly specified and limited, the terms "connected", "connected", and "fixed" should be understood in a broad sense, for example, it 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. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0036] In the present invention, 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.

[0037] In the description of this embodiment, the terms "upper", "lower", "right", etc., directions or positional relationships are based on the directions or positional relationships shown in the drawings, and are only for the convenience of description and simplification of operation, rather than indicating or implying that the device or element referred to must have a specific direction, be constructed and operated in a specific direction, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are only used to distinguish in the description and have no special meaning.

[0038] Embodiment 1

[0039] To solve the problems mentioned above, please refer to Figure 1 and Figure 2The present embodiment provides a hydrogen injection valve for a fuel cell hydrogen circulation system, the hydrogen injection valve for a fuel cell hydrogen circulation system comprises a shell 110, a nozzle 120 and a push block 130, the shell 110 is provided with a hydrogen flow inlet 111, the nozzle 120 is provided at one end of the shell 110, and is connected with the interior of the shell 110 through a connecting port 121, a nozzle 122 is provided at one end of the nozzle 120 away from the shell 110, the shell 110 is sleeved on the outer periphery of the push block 130, and the gap between the push block 130 and the nozzle 120 is connected to the hydrogen flow The inlet 111 is connected, the push block 130 can move along the axial direction of the nozzle 120, and a probe 140 is fixedly connected to the push block 130, the probe 140 is coaxially arranged with the nozzle 120, and part of the probe 140 can pass through the connecting port 121 and be located in the nozzle 120, an adjusting portion 141 is provided at one end of the probe 140 away from the push block 130, the diameter of the cross section of the adjusting portion 141 gradually decreases from the side close to the push block 130 to the side away from the push block 130, and the adjusting portion 141 can pass through the nozzle 122 of the nozzle 120.

[0040] In this embodiment, the hydrogen flow inlet 111, the gap between the push block 130 and the nozzle 120, the interior of the nozzle 120 and the nozzle 122 together constitute a gas path for the circulation of hydrogen. In this embodiment, the cross-sectional area of ​​the nozzle 122 is adjusted by the adjustment part 141 of the probe 140. When the hydrogen flow rate entering the ejector decreases, the cross-sectional area of ​​the nozzle 122 decreases. When the hydrogen flow rate entering the ejector increases, the cross-sectional area of ​​the nozzle 122 increases, thereby ensuring that the flow rate of hydrogen is compatible with the hydrogen flow rate entering the ejector, thereby ensuring that the fuel cell hydrogen circulation system always maintains maximum working efficiency.

[0041] Specifically, when the flow rate of hydrogen entering the ejector decreases, the push block 130 moves toward the nozzle 120 along the axial direction of the nozzle 120, and drives the probe 140 to move in the direction toward the nozzle 122 of the nozzle 120, so that the diameter of the cross section of the portion of the regulating part 141 located at the nozzle 122 increases, thereby reducing the cross-sectional area of ​​the nozzle 122, thereby ensuring that the hydrogen with a smaller flow rate has sufficient pressure when flowing through the nozzle 122, so that the flow rate of the hydrogen meets the requirements, thereby ensuring that the ejection performance of the ejector meets the requirements, when the flow rate of hydrogen entering the ejector increases, the push block 130 moves away from the nozzle 120 along the axial direction of the nozzle 120, and drives the probe 140 to move in the direction away from the nozzle 122 of the nozzle 120, so that the diameter of the cross section of the portion of the regulating part 141 located at the nozzle 122 decreases, thereby increasing the cross-sectional area of ​​the nozzle 122, thereby ensuring that the flow rate of the hydrogen with a larger flow rate meets the requirements when flowing through the nozzle 122, and also ensuring that the flow rate of the hydrogen flowing through the nozzle 122 will not decrease.

[0042] In combination with the above, since the hydrogen needs to flow through the gap between the push block 130 and the nozzle 120 to enter the nozzle 120, when the push block 130 moves toward the nozzle 120 along the axial direction of the nozzle 120, in addition to the cross-sectional area of ​​the nozzle 122 being able to be reduced, the gap between the push block 130 and the nozzle 120 will also be reduced, thereby ensuring that the hydrogen with a smaller flow rate has sufficient pressure when flowing through the entire gas path, so as to further make the flow rate of the hydrogen meet the requirements, when the push block 130 moves away from the nozzle 120 along the axial direction of the nozzle 120, in addition to the cross-sectional area of ​​the nozzle 122 being able to increase, the gap between the push block 130 and the nozzle 120 will also increase to accommodate the hydrogen with a larger circulation flow rate, that is, this embodiment can achieve that the gap between the push block 130 and the nozzle 120 corresponds to the cross-sectional area of ​​the nozzle 122 by linking the push block 130 and the probe 140, thereby ensuring both the flow rate of the hydrogen and the flow rate of the hydrogen.

[0043] It can be understood that the adjustment portion 141 in this embodiment is configured to be conical. Of course, in other optional embodiments, the adjustment portion 141 may also be configured to be truncated cone-shaped, which is not specifically limited in this embodiment.

[0044] Furthermore, the hydrogen injection valve for the fuel cell hydrogen circulation system also includes a driving structure, which is configured to drive the push block 130 to move axially along the nozzle 120 to adjust the gap between the push block 130 and the nozzle 120 and change the cross-sectional area of ​​the nozzle 122 through the probe 140.

[0045] Since the gap between the push block 130 and the nozzle 120 in this embodiment is connected to the hydrogen flow inlet 111, when the driving structure drives the push block 130 to move toward the nozzle 120 along the axial direction of the nozzle 120, in order to avoid the push block 130 blocking the channel for hydrogen circulation, the hydrogen injection valve for the fuel cell hydrogen circulation system in this embodiment also includes a limiting structure 160. The limiting structure 160 is configured to limit the position of the push block 130 along the axial direction of the nozzle 120, that is, the limiting structure 160 can ensure that the gap between the push block 130 and the nozzle 120 is not too small, so as to avoid the push block 130 blocking the channel for hydrogen circulation.

[0046] In this embodiment, the limiting structure 160 includes a first protrusion 161 and a second protrusion 162. The first protrusion 161 is formed at one end of the push block 130 away from the probe 140, and the second protrusion 162 is formed inside the shell 110. When the push block 130 moves toward the nozzle 120, the first protrusion 161 can abut against the second protrusion 162, thereby limiting the axial position of the push block 130 along the nozzle 120.

[0047] Preferably, the push block 130 in this embodiment is magnetic, and the driving structure includes an electromagnet 151 and a reset member 152. The electromagnet 151 is arranged on the side of the push block 130 away from the probe 140, and the reset member 152 is configured to reset the push block 130 when the magnetism of the electromagnet 151 is weakened, that is, in this embodiment, the magnetic force generated by the electromagnet 151 on the push block 130 causes the push block 130 to move axially along the nozzle 120. When the magnetism of the electromagnet 151 is weakened, that is, when the magnetic force generated by the electromagnet 151 on the push block 130 is reduced, the reset member 152 can reset the push block 130, thereby realizing the reciprocating movement of the push block 130 along the axial direction of the nozzle 120. Compared with setting the driving structure as other structures such as a driving motor, the driving structure in this embodiment is simple in structure and can also save extra power consumption used to make the driving motor work.

[0048] In this embodiment, the electromagnet 151 is preferably capable of generating the same magnetism as the push block 130, so as to generate a thrust on the push block 130 that can push the push block 130 to move toward the nozzle 120. When the hydrogen flow rate entering the ejector decreases, the magnetism of the electromagnet 151 increases, the thrust generated by the electromagnet 151 on the push block 130 increases, and the push block 130 moves toward the nozzle 120 along the axial direction of the nozzle 120. When the hydrogen flow rate entering the ejector increases, the magnetism of the electromagnet 151 weakens, the thrust generated by the electromagnet 151 on the push block 130 weakens, and the push block 130 moves away from the nozzle 120 along the axial direction of the nozzle 120.

[0049] Furthermore, the reset member 152 in the present embodiment is a reset spring, which can be elastically deformed when the push block 130 is pushed by the electromagnet 151, so as to have elastic potential energy for resetting the push block 130 when the thrust generated by the electromagnet 151 on the push block 130 is reduced. Specifically, the reset spring in the present embodiment is a tension spring, which is sleeved on the outer periphery of the push block 130 and abuts against the second protrusion 162 and the third protrusion 131 formed at one end of the push block 130 close to the nozzle 120. When the push block 130 is pushed by the electromagnet 151, the reset spring is stretched and elastically deformed. When the magnetism of the electromagnet 151 is weakened, the thrust generated by the electromagnet 151 on the push block 130 is reduced, and the thrust generated by the electromagnet 151 on the push block 130 is less than the reset force generated by the reset spring on the push block 130, so that the reset spring resets the push block 130.

[0050] Preferably, the push block 130 and the housing 110 in this embodiment are sealed to prevent hydrogen from leaking into the gap between the push block 130 and the nozzle 120 .

[0051] In this embodiment, a circulation valve 112 is fixedly installed inside the shell 110, the circulation valve 112 is located between the push block 130 and the nozzle 120, and is sleeved on the outer periphery of the probe 140. A flow channel 1121 is provided on the circulation valve 112, and the flow channel 1121 connects the gap between the push block 130 and the circulation valve 112 and the connecting port 121. The hydrogen entering the gap between the push block 130 and the nozzle 120 can flow to the connecting port 121 through the flow channel 1121 on the circulation valve 112, thereby entering the nozzle 120. The circulation valve 112 can also assist in fixing the probe 140 to prevent the probe 140 from shaking.

[0052] It can be understood that the gap between the push block 130 and the nozzle 120 mentioned above refers to the gap between the push block 130 and the circulation valve 112 .

[0053] Based on the above, the present embodiment further provides a fuel cell hydrogen circulation system, which includes an ejector pipe 200 and a hydrogen injection valve for a fuel cell hydrogen circulation system as described above, wherein the end of the nozzle 120 away from the housing 110 can extend into the ejector pipe 200 through an opening at the end of the ejector pipe 200, and hydrogen can be injected into the ejector pipe 200 from the nozzle 122 of the nozzle 120. The fuel cell hydrogen circulation system provided with the hydrogen injection valve for a fuel cell hydrogen circulation system can always maintain maximum working efficiency.

[0054] Embodiment 2

[0055] Compared with the first embodiment, the difference of this embodiment is that the electromagnet 151 can generate magnetism opposite to that of the push block 130, so as to generate a pulling force on the push block 130 that can pull the push block 130 away from the nozzle 120. When the hydrogen flow rate entering the ejector increases, the magnetism of the electromagnet 151 is enhanced, and the pulling force generated by the electromagnet 151 on the push block 130 increases, and the push block 130 moves away from the nozzle 120 along the axial direction of the nozzle 120. When the hydrogen flow rate entering the ejector decreases, the magnetism of the electromagnet 151 is weakened, and the pulling force generated by the electromagnet 151 on the push block 130 is weakened, and the push block 130 moves toward the nozzle 120 along the axial direction of the nozzle 120.

[0056] It can be understood that the return spring in this embodiment is a compression spring. When the push block 130 is pulled by the electromagnet 151, the return spring is compressed, thereby undergoing elastic deformation. When the magnetism of the electromagnet 151 weakens, the pulling force generated by the electromagnet 151 on the push block 130 is reduced. The pulling force generated by the electromagnet 151 on the push block 130 is less than the return force generated by the return spring on the push block 130, and the return spring resets the push block 130.

[0057] Obviously, the above embodiments of the present invention are merely examples for clearly illustrating the present invention, and are not intended to limit the embodiments of the present invention. For those skilled in the art, various obvious changes, readjustments and substitutions can be made without departing from the protection scope of the present invention. It is not necessary and impossible to list all the embodiments here. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the protection scope of the claims of the present invention.

Claims

1. A hydrogen injection valve for a fuel cell hydrogen circulation system, characterized in that: include: The housing (110) is provided with a hydrogen flow inlet (111); A nozzle (120) is disposed at one end of the shell (110) and is connected to the interior of the shell (110) via a communication port (121); an end of the nozzle (120) away from the shell (110) is provided with a nozzle (122); and A push block (130), wherein the shell (110) is sleeved on the outer circumference of the push block (130), a gap between the push block (130) and the nozzle (120) is communicated with the hydrogen gas inlet (111), the push block (130) is movable along the axial direction of the nozzle (120), and a probe (140) is fixedly connected to the push block (130), the probe (140) is coaxially arranged with the nozzle (120), and a portion of the probe (140) is capable of passing through the communication port (121) and being located in the nozzle (120), an adjusting portion (141) is provided at one end of the probe (140) away from the push block (130), the diameter of the cross section of the adjusting portion (141) gradually decreases from a side close to the push block (130) to a side away from the push block (130), and the adjusting portion (141) is capable of passing through the nozzle (122) of the nozzle (120); a driving structure, the driving structure being configured to drive the push block (130) to move along the axial direction of the nozzle (120); The push block (130) has magnetism, and the driving structure comprises: An electromagnet (151) is arranged on a side of the push block (130) away from the probe (140); and The reset member (152) is configured to reset the push block (130) when the magnetism of the electromagnet (151) is weakened.

2. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 1, characterized in that: The electromagnet (151) is capable of generating the same magnetism as the push block (130) so as to generate a thrust force on the push block (130) capable of pushing the push block (130) to move toward the nozzle (120).

3. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 2, characterized in that: The reset member (152) is a reset spring, which can be elastically deformed when the push block (130) is pushed by the electromagnet (151), so as to have elastic potential energy for resetting the push block (130) when the thrust generated by the electromagnet (151) on the push block (130) decreases.

4. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 1, characterized in that: The electromagnet (151) is capable of generating magnetism opposite to that of the push block (130), so as to generate a pulling force on the push block (130) capable of pulling the push block (130) away from the nozzle (120).

5. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 1, characterized in that: The push block (130) and the housing (110) are sealed.

6. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 1, characterized in that: A circulation valve (112) is fixedly arranged inside the housing (110), the circulation valve (112) is located between the push block (130) and the nozzle (120), and is sleeved on the outer circumference of the probe (140), and a flow channel (1121) is arranged on the circulation valve (112), and the flow channel (1121) communicates with the gap between the push block (130) and the circulation valve (112) and the communication port (121).

7. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 1, characterized in that: The hydrogen injection valve for a fuel cell hydrogen circulation system further comprises a limiting structure (160), wherein the limiting structure (160) is configured to limit the position of the push block (130) along the axial direction of the nozzle (120).

8. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 7, characterized in that: The limiting structure (160) comprises a first protrusion (161) and a second protrusion (162), wherein the first protrusion (161) is formed at one end of the push block (130) away from the probe (140), and the second protrusion (162) is formed inside the shell (110), and when the push block (130) moves toward the nozzle (120), the first protrusion (161) can abut against the second protrusion (162).

9. A fuel cell hydrogen circulation system, characterized in that: The fuel cell hydrogen circulation system comprises an ejector pipe (200) and a hydrogen injection valve for a fuel cell hydrogen circulation system as claimed in any one of claims 1 to 8, wherein an end of the nozzle (120) away from the shell (110) can extend into the ejector pipe (200) through an opening at the end of the ejector pipe (200).

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