CN115126879A

CN115126879A - Hydrogen spraying valve for fuel cell hydrogen circulation system and fuel cell hydrogen circulation system

Info

Publication number: CN115126879A
Application number: CN202210752399.3A
Authority: CN
Inventors: 易正根; 倪永成; 刘豪; 郑冰; 靳玉刚; 赵舟; 梅赟栋
Original assignee: FAW Jiefang Automotive Co Ltd
Current assignee: FAW Jiefang Automotive Co Ltd
Priority date: 2022-06-28
Filing date: 2022-06-28
Publication date: 2022-09-30

Abstract

The invention belongs to the technical field of fuel cells and discloses a hydrogen spraying valve for a fuel cell hydrogen circulation system and the fuel cell hydrogen circulation system. The invention can ensure that the flow rate of the hydrogen is matched with the flow rate of the hydrogen entering the ejector, thereby ensuring that the hydrogen circulation system of the fuel cell always keeps the maximum working efficiency.

Description

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

Technical Field

The invention relates to the technical field of fuel cells, in particular to a hydrogen injection valve for a fuel cell hydrogen circulation system and the fuel cell hydrogen circulation system.

Background

The hydrogen circulation system of the fuel cell can improve the utilization rate of hydrogen, and meanwhile, the hydrogen circulation can also improve the water balance in the galvanic pile to avoid the occurrence of flooding in the galvanic pile and improve the working efficiency of the galvanic pile.

The fuel cell hydrogen circulation system generally comprises a hydrogen injection valve, hydrogen can be injected from a nozzle of the hydrogen injection valve, and the cross-sectional area of a nozzle of the traditional hydrogen injection valve is determined at the beginning of design, so that the cross-sectional area of a gas path for circulating the hydrogen, which is positioned at the nozzle of the nozzle, cannot be adjusted. When the fuel cell hydrogen circulation system works according to the simulated working condition during design, the fuel cell hydrogen circulation system can reach the maximum working efficiency, but when the actual working condition of the fuel cell hydrogen circulation system is different from the simulated working condition during design, the cross-sectional area of the nozzle cannot be adjusted, so that the working efficiency of the fuel cell hydrogen circulation system is greatly reduced. Specifically, when the electric pile outputs low power or the hydrogen amount required by reaction is very small, the hydrogen flow entering the ejector from the hydrogen storage bottle is reduced, and the cross-sectional area of the gas path for circulating the hydrogen, which is positioned at the nozzle of the nozzle, is unchanged, so that the flow rate of the hydrogen flowing out of the nozzle is reduced, the ejection performance of the ejector is reduced, even no ejection effect is generated, and the working efficiency of the fuel cell hydrogen circulation system is greatly reduced.

Therefore, the above problems need to be solved.

Disclosure of Invention

The invention aims to provide a hydrogen injection valve for a fuel cell hydrogen circulation system and the fuel cell hydrogen circulation system, which aim to solve the problem that the working efficiency of the fuel cell hydrogen circulation system is greatly reduced because the cross-sectional area of a gas path for circulating hydrogen, which is positioned at a nozzle of a nozzle, cannot be adjusted.

In order to achieve the purpose, the invention adopts the following technical scheme:

one aspect of the present invention provides a hydrogen injection valve for a hydrogen circulation system of a fuel cell, comprising:

a housing provided with a hydrogen gas inflow port;

the nozzle is arranged at one end of the shell and is communicated with the interior of the shell through a communication port, and a nozzle opening is arranged at one end of the nozzle, which is far away from the shell; and

the shell is sleeved on the periphery of the push block, a gap between the push block and the nozzle is communicated with the hydrogen gas inlet, the push block can move along the axial direction of the nozzle, a probe is fixedly connected to the push block, the probe and the nozzle are coaxially arranged, part of the probe can penetrate through the communication port and is located in the nozzle, an adjusting portion is arranged at one end, far away from the push block, of the probe, the diameter of the cross section of the adjusting portion is gradually reduced from one side, close to the push block, to one side, far away from the push block, and the adjusting portion can penetrate through a nozzle opening of the nozzle.

Preferably, the hydrogen injection valve for a hydrogen circulation system of a fuel cell further comprises a driving structure configured to drive the push block to move in the axial direction of the nozzle.

Preferably, the push block has magnetism, and the driving structure includes:

the electromagnet is arranged on one side of the push block, which is far away from the probe; and

a reset member configured to reset the push block when magnetism of the electromagnet is weakened.

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

Preferably, the reset piece is a reset spring, and the reset spring can elastically deform 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 is reduced.

Preferably, the electromagnet is capable of generating magnetism opposite to that of the push block so as to generate a pulling force capable of pulling the push block away from the nozzle on the push block.

Preferably, the push block and the shell are arranged in a sealing mode.

Preferably, a flow valve is fixedly disposed in the housing, the flow valve is located between the push block and the nozzle and is sleeved on the periphery of the probe, and a flow passage is disposed on the flow valve and communicates a gap between the push block and the flow valve with the communication port.

Preferably, the hydrogen injection valve for the 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.

Preferably, the limiting structure comprises a first protruding part and a second protruding part, the first protruding part is formed at one end, away from the probe, of the push block, the second protruding part is formed inside the shell, and when the push block moves towards the nozzle, the first protruding part can abut against the second protruding part.

The invention further provides a fuel cell hydrogen circulation system which comprises an injection pipe and the hydrogen injection valve for the fuel cell hydrogen circulation system, wherein one end of the nozzle, which is far away from the shell, can extend into the injection pipe from an opening at the end of the injection pipe.

The invention has the beneficial effects that: according to the invention, the cross-sectional area of the nozzle is adjusted by the adjusting part of the probe, when the flow of hydrogen entering the ejector is reduced, the cross-sectional area of the nozzle is reduced, and when the flow of hydrogen entering the ejector is increased, the cross-sectional area of the nozzle is increased, so that the flow rate of hydrogen can be ensured to be matched with the flow of hydrogen entering the ejector, and the maximum working efficiency of the fuel cell hydrogen circulation system is ensured to be always kept.

Drawings

FIG. 1 is a schematic structural view of a hydrogen circulation system of a fuel cell in an embodiment of the present invention;

fig. 2 is a partially enlarged view of a point a in fig. 1.

In the figure:

110. a housing; 111. a hydrogen gas inlet; 112. a flow-through valve; 1121. a flow channel;

120. a nozzle; 121. a communication port; 122. a spout;

130. a push block; 131. a third projecting portion;

140. a probe; 141. an adjustment section;

151. an electromagnet; 152. a reset member;

160. a limiting structure; 161. a first projecting portion; 162. a second projection;

200. an injection pipe.

Detailed Description

The present invention will be described in further detail with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting of the invention. It should be further noted that, for the convenience of description, only some of the structures related to the present invention are shown in the drawings, not all of the structures.

In the description of the present invention, unless expressly stated or limited otherwise, the terms "connected," "connected," and "fixed" are to be construed broadly, e.g., as meaning permanently connected, removably connected, or integral to one another; can be mechanically or electrically connected; either directly or indirectly through intervening media, either internally or in any other relationship. The specific meanings of the above terms in the present invention can be understood in a specific case to those of ordinary skill in the art.

In the present invention, unless otherwise expressly stated or limited, "above" or "below" a first feature means that the first and second features are in direct contact, or that the first and second features are not in direct contact but are in contact with each other via another feature therebetween. Also, the first feature being "on," "above" and "over" the second feature includes the first feature being directly on and obliquely above the second feature, or merely indicating that the first feature is at a higher level than the second feature. A first feature being "under," "below," and "beneath" a second feature includes the first feature being directly under and obliquely below the second feature, or simply meaning that the first feature is at a lesser elevation than the second feature.

In the description of the present embodiment, the terms "upper", "lower", "right", etc. are used in an orientation or positional relationship based on that shown in the drawings only for convenience of description and simplicity of operation, and do not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used only for descriptive purposes and are not intended to have a special meaning.

Example one

To solve the above-mentioned problems, referring to fig. 1 and fig. 2, the present embodiment provides a hydrogen injection valve for a fuel cell hydrogen circulation system, which includes a housing 110, a nozzle 120 and a push block 130, wherein the housing 110 is provided with a hydrogen flow inlet 111, the nozzle 120 is disposed at one end of the housing 110 and is communicated with the inside of the housing 110 through a communication port 121, one end of the nozzle 120 away from the housing 110 is provided with a nozzle 122, the housing 110 is sleeved on the periphery of the push block 130, a gap between the push block 130 and the nozzle 120 is communicated with the hydrogen flow inlet 111, the push block 130 is capable of moving along the axial direction of the nozzle 120, the push block 130 is fixedly connected with a probe 140, the probe 140 and the nozzle 120 are coaxially disposed, a portion of the probe 140 is capable of passing through the communication port 121 and being located in the nozzle 120, one end of the probe 140 away from the push block 130 is provided with an adjusting portion 141, a diameter of a cross section of the adjusting portion 141 is gradually decreased from a side close to the push block 130 to a side away from the push block 130, the regulating portion 141 can pass through the spout 122 of the nozzle 120.

In this embodiment, the hydrogen inlet 111, the gap between the push block 130 and the nozzle 120, the inside of the nozzle 120, and the nozzle 122 together form a hydrogen circulation gas path, in this embodiment, the adjusting portion 141 of the probe 140 adjusts the cross-sectional area of the nozzle 122, when the hydrogen flow entering the ejector is reduced, the cross-sectional area of the nozzle 122 is reduced, and when the hydrogen flow entering the ejector is increased, the cross-sectional area of the nozzle 122 is increased, so that the matching between the flow rate of hydrogen and the hydrogen flow entering the ejector can be ensured, and the maximum working efficiency of the fuel cell hydrogen circulation system can be ensured.

Specifically, when the flow rate of hydrogen entering the ejector is reduced, the push block 130 moves towards the nozzle 120 along the axial direction of the nozzle 120, and drives the probe 140 to move along the direction towards the nozzle 122 of the nozzle 120, so that the diameter of the cross section of the part of the adjusting portion 141 located at the nozzle 122 is increased, and the cross section area of the nozzle 122 is reduced, and further, sufficient pressure is provided when hydrogen with a small flow rate flows through the nozzle 122, so that the flow rate of hydrogen meets the requirement, and the ejection performance of the ejector meets the requirement, when the flow rate of hydrogen entering the ejector is increased, the push block 130 is far away from the nozzle 120 along the axial direction of the nozzle 120, and drives the probe 140 to move along the direction far away from the nozzle 122 of the nozzle 120, so that the diameter of the cross section of the part of the adjusting portion 141 located at the nozzle 122 is reduced, and the cross section area of the nozzle 122 is increased, so that the flow rate of hydrogen with a large flow rate meets the requirement when the hydrogen flows through the nozzle 122, it is also possible to ensure that the flow rate of hydrogen gas flowing through the nozzle 122 is not reduced.

In conjunction with the above, since hydrogen gas needs to flow through the gap between the push block 130 and the nozzle 120 into the nozzle 120, when the push block 130 is moved toward the nozzle 120 in the axial direction of the nozzle 120, in addition to the reduction in the sectional area of the spout 122, the gap between the push block 130 and the nozzle 120 is reduced, thereby ensuring that the hydrogen with less flow has enough pressure when flowing through the whole gas circuit so as to further ensure that the flow rate of the hydrogen meets the requirement, when the push block 130 is far away from the nozzle 120 along the axial direction of the nozzle 120, in addition to the increase of the cross-sectional area of the nozzle 122, the gap between the push block 130 and the nozzle 120 is increased to adapt to the hydrogen with larger flow rate, that is, in the present embodiment, the gap between the push block 130 and the nozzle 120 corresponds to the cross-sectional area of the nozzle 122 by the linkage of the push block 130 and the probe 140, so that the flow rate of the hydrogen gas and the flow rate of the hydrogen gas can be ensured.

It is understood that the adjusting portion 141 in this embodiment is provided in a conical shape, however, in other alternative embodiments, the adjusting portion 141 may also be provided in a truncated cone shape, and this is not particularly limited in this embodiment.

Further, the hydrogen injection valve for a hydrogen circulation system of a fuel cell further includes a driving structure configured to drive the push block 130 to move in the axial direction of the nozzle 120 to adjust a gap between the push block 130 and the nozzle 120 and to change the sectional area of the nozzle 122 by the probe 140.

Since the gap between the push block 130 and the nozzle 120 in this embodiment is communicated with the hydrogen 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 prevent the push block 130 from blocking the passage of the hydrogen gas, the hydrogen injection valve for a hydrogen circulation system of a fuel cell in this embodiment further includes a limiting structure 160, and 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 prevent the push block 130 from blocking the passage of the hydrogen gas.

In this embodiment, the position limiting structure 160 includes a first protrusion 161 and a second protrusion 162, the first protrusion 161 is formed at an end of the push block 130 away from the probe 140, the second protrusion 162 is formed inside the housing 110, and when the push block 130 moves toward the nozzle 120, the first protrusion 161 can abut against the second protrusion 162, so as to limit the position of the push block 130 along the axial direction of the nozzle 120.

Preferably, the pushing block 130 in this embodiment has magnetism, the driving structure includes an electromagnet 151 and a resetting member 152, the electromagnet 151 is disposed on a side of the pushing block 130 away from the probe 140, the resetting member 152 is configured to reset the pushing block 130 when the magnetism of the electromagnet 151 is weakened, that is, in this embodiment, the pushing block 130 is moved along the axial direction of the nozzle 120 by the magnetic force generated by the electromagnet 151 on the pushing block 130, when the magnetism of the electromagnet 151 is weakened, that is, the magnetic force generated by the electromagnet 151 on the pushing block 130 is reduced, the resetting member 152 can reset the pushing block 130, so as to realize the reciprocating movement of the pushing block 130 along the axial direction of the nozzle 120, compared with the driving structure configured as a driving motor or other structures, the driving structure in this embodiment is simple, and at the same time, the extra power consumption for operating the driving motor can be saved.

In this embodiment, the electromagnet 151 is preferably capable of generating the same magnetism as the push block 130 to generate a thrust force on the push block 130, wherein the thrust force is capable of pushing the push block 130 to move towards the nozzle 120, when the flow rate of hydrogen entering the ejector is reduced, the magnetism of the electromagnet 151 is enhanced, the thrust force generated by the electromagnet 151 on the push block 130 is increased, the push block 130 moves towards the nozzle 120 along the axial direction of the nozzle 120, when the flow rate of hydrogen entering the ejector is increased, the magnetism of the electromagnet 151 is weakened, the thrust force generated by the electromagnet 151 on the push block 130 is weakened, and the push block 130 is far away from the nozzle 120 along the axial direction of the nozzle 120.

Further, the reset member 152 in this embodiment is a reset spring, and the reset spring can elastically deform 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 pushing force generated by the electromagnet 151 on the push block 130 is reduced, specifically, the reset spring in this embodiment is a tension spring, the reset spring is sleeved on the outer circumference of the push block 130 and abuts between the second protrusion 162 and a 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 elongated, so as to elastically deform, when the magnetism of the electromagnet 151 is weakened, the pushing force generated by the electromagnet 151 on the push block 130 is reduced, the pushing force generated by the electromagnet 151 on the push block 130 is smaller than the reset force generated by the reset spring on the push block 130, and the reset spring resets the push block 130.

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

In this embodiment, the flow valve 112 is fixedly disposed inside the housing 110, the flow valve 112 is located between the pushing block 130 and the nozzle 120 and is sleeved on the periphery of the probe 140, the flow channel 1121 is disposed on the flow valve 112, the flow channel 1121 communicates with the gap between the pushing block 130 and the flow valve 112 and the communication port 121, hydrogen entering the gap between the pushing block 130 and the nozzle 120 can flow to the communication port 121 through the flow channel 1121 on the flow valve 112 and then enter the nozzle 120, and the flow valve 112 can assist in fixing the probe 140 to prevent the probe 140 from shaking.

It will be appreciated that the clearance between the push block 130 and the nozzle 120 described above refers to the clearance between the push block 130 and the flow valve 112.

Based on the foregoing, the present embodiment further provides a hydrogen circulation system for a fuel cell, the hydrogen circulation system for a fuel cell includes an injection pipe 200 and the above-mentioned hydrogen injection valve for a hydrogen circulation system for a fuel cell, one end of the nozzle 120 away from the housing 110 can extend into the injection pipe 200 through an opening at an end of the injection pipe 200, and hydrogen can be injected into the injection pipe 200 through the nozzle 122 of the nozzle 120. The fuel cell hydrogen circulation system provided with the hydrogen injection valve for the fuel cell hydrogen circulation system can always keep the maximum working efficiency.

Example two

Compared with the first embodiment, the difference of the present embodiment is that the electromagnet 151 can generate magnetism opposite to that of the push block 130 to generate a pulling force on the push block 130, which can pull the push block 130 away from the nozzle 120, when the hydrogen flow entering the ejector is increased, the magnetism of the electromagnet 151 is increased, the pulling force on the push block 130 generated by the electromagnet 151 is increased, the push block 130 is away from the nozzle 120 along the axial direction of the nozzle 120, when the hydrogen flow entering the ejector is decreased, the magnetism of the electromagnet 151 is decreased, the pulling force on the push block 130 generated by the electromagnet 151 is decreased, and the push block 130 moves towards the nozzle 120 along the axial direction of the nozzle 120.

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, so as to generate elastic deformation, when the magnetism of the electromagnet 151 is weakened, the pulling force of the electromagnet 151 on the push block 130 is reduced, the pulling force of the electromagnet 151 on the push block 130 is smaller than the return force of the return spring on the push block 130, and the return spring returns the push block 130.

It should be understood that the above-described 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. Numerous obvious variations, adaptations and substitutions will occur to those skilled in the art without departing from the scope of the invention. And are neither required nor exhaustive of all embodiments. Any modification, equivalent replacement, and improvement made within the spirit and principle 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, comprising:

a housing (110) provided with a hydrogen gas inlet (111);

the nozzle (120) is arranged at one end of the shell (110), is communicated with the inside of the shell (110) through a communication port (121), and a nozzle opening (122) is arranged at one end, far away from the shell (110), of the nozzle (120); and

the shell (110) is sleeved on the periphery of the push block (130), a gap between the push block (130) and the nozzle (120) communicates with the hydrogen gas inflow port (111), the push block (130) is movable in the axial direction of the nozzle (120), and the push block (130) is fixedly connected with a probe (140), the probe (140) and the nozzle (120) are coaxially arranged, and part of the probe (140) can pass through the communication opening (121) and is positioned in the nozzle (120), an adjusting part (141) is arranged at one end of the probe (140) far away from the push block (130), the diameter of the cross section of the adjusting part (141) is gradually reduced from one side close to the push block (130) to one side far away from the push block (130), the regulating portion (141) is capable of passing through a spout (122) of the nozzle (120).

2. A hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 1, further comprising a driving structure configured to drive the push block (130) to move in the axial direction of the nozzle (120).

3. A hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 2, wherein the push block (130) has magnetism, and the driving structure comprises:

the electromagnet (151) is arranged on one side, away from the probe (140), of the push block (130); and

a reset member (152) configured to reset the push block (130) when the magnetism of the electromagnet (151) is weakened.

4. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 3, wherein the electromagnet (151) is capable of generating the same magnetism as the push block (130) to generate a pushing force on the push block (130) capable of pushing the push block (130) toward the nozzle (120).

5. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 4, wherein the reset member (152) is a reset spring that is elastically deformable when the push block (130) is pushed by the electromagnet (151) to have elastic potential energy for resetting the push block (130) when the pushing force of the electromagnet (151) against the push block (130) is reduced.

6. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 3, wherein the electromagnet (151) is capable of generating a magnetic force opposite to the push block (130) to generate a pulling force on the push block (130) capable of pulling the push block (130) away from the nozzle (120).

7. The hydrogen injection valve for the fuel cell hydrogen circulation system according to claim 1, wherein the push block (130) and the housing (110) are hermetically disposed.

8. The hydrogen injection valve for the fuel cell hydrogen circulation system according to claim 1, wherein a flow valve (112) is fixedly arranged inside the housing (110), the flow valve (112) is positioned between the push block (130) and the nozzle (120) and is sleeved on the periphery of the probe (140), a flow channel (1121) is arranged on the flow valve (112), and the flow channel (1121) is communicated with a gap between the push block (130) and the flow valve (112) and the communication port (121).

9. A hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 1, further comprising 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).

10. The hydrogen injection valve for a fuel cell hydrogen circulation system according to claim 9, wherein the stopper structure (160) includes a first protrusion (161) and a second protrusion (162), the first protrusion (161) is formed at an end of the push block (130) away from the probe (140), the second protrusion (162) is formed inside the housing (110), and the first protrusion (161) can abut against the second protrusion (162) when the push block (130) moves toward the nozzle (120).

11. 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 the fuel cell hydrogen circulation system according to any one of claims 1 to 10, wherein one end of the nozzle (120) far away from the shell (110) can extend into the ejector pipe (200) from an opening at the end of the ejector pipe (200).