An ejector for a hydrogen fuel cell hydrogen circulation system

Abstract

The application discloses an ejector for a hydrogen fuel cell hydrogen circulation system, which comprises a shell, a nozzle needle, a nozzle needle precision sliding drive mechanism and a nozzle are arranged in the shell, the shell is divided into an ejecting chamber, a mixing chamber and a diffusion chamber from left to right, one end of the nozzle is arranged in the ejecting chamber and the other end extends into the mixing chamber, a nozzle flow channel is arranged in the nozzle, the nozzle needle is slidably arranged in the nozzle flow channel, a high-pressure gas inlet is arranged on the side wall of the ejecting chamber of the shell, the high-pressure gas inlet and the nozzle flow channel are in communication, and a low-pressure gas inlet is arranged on the side wall of the mixing chamber of the shell. According to the power of the hydrogen fuel cell, the nozzle needle precision sliding drive mechanism is used for accurately controlling the accurate movement of the nozzle needle on the nozzle flow channel, the diameter of the nozzle flow channel is continuously changed, and high-efficiency injection is realized.

Description

Technical Field

[0001] This invention relates to the field of hydrogen fuel cells, and more specifically to an ejector for a hydrogen recirculation system in a hydrogen fuel cell. Background Technology

[0002] Against the backdrop of ever-increasing global energy demand, a worsening environmental crisis, and growing population pressure, new clean energy utilization methods are gaining increasing attention. Among them, hydrogen fuel cells, with their advantages of high efficiency, zero pollution, low noise, fast start-up, and long lifespan, have broad development prospects and represent the next generation of clean energy and vehicle power.

[0003] Hydrogen fuel cells directly convert the chemical energy of hydrogen into electrical energy through an electrochemical reaction without combustion, thus offering advantages such as high efficiency, high power density, zero emissions, and low noise, making them ideal for automotive power. In the hydrogen recirculation system of hydrogen fuel cell vehicles, a hydrogen recirculation pump is typically used as the hydrogen circulation device. However, hydrogen recirculation pumps are difficult to manufacture, costly, have poor reliability, and add extra power consumption and weight. Ejectors, on the other hand, have significant advantages such as simple structure, high reliability, low cost, no parasitic power consumption in the system, and light weight, making them a growing trend to replace hydrogen recirculation pumps.

[0004] In practical applications, the evaluation index for ejector performance is the ejection rate, which is the ratio of secondary flow mass flow rate to mainstream flow mass flow rate. Onboard fuel cell systems experience wide load variations, typically ranging from 5% to 100% of their rated value. Traditional ejectors cannot precisely adjust the nozzle diameter according to changes in fuel cell vehicle power, resulting in a narrow operating range for maintaining a high ejection rate. When the fuel cell operates under low load, its ejection rate drops significantly, often failing to meet system requirements. Existing solutions address this issue, such as patent CN109873181, which describes an ejector suitable for hydrogen fuel cell vehicle systems. This design features a nozzle with multiple flow channels, including a central flow channel and at least one pair of flow channels symmetrical about the central flow channel. When the fuel cell adjusts its power, it supplies mainstream hydrogen using flow channels with different throat diameters to achieve efficient secondary flow hydrogen ejection. However, this method is not precise and continuous. Therefore, a more precise and continuous ejector for hydrogen fuel cell hydrogen recirculation systems is needed to improve ejection efficiency. Summary of the Invention

[0005] The purpose of this invention is to solve the problems in the prior art and provide an ejector for a hydrogen recirculation system in a hydrogen fuel cell.

[0006] The above-mentioned technical objective of the present invention is achieved through the following technical solution:

[0007] An ejector for a hydrogen recirculation system in a hydrogen fuel cell includes a housing. The housing contains a nozzle needle, a precision sliding drive mechanism for the nozzle needle, and a nozzle. The housing is divided into an ejection chamber, a mixing chamber, and a diffusion chamber from left to right. One end of the nozzle is located in the ejection chamber, and the other end extends into the mixing chamber. A nozzle flow channel is provided within the nozzle, and the nozzle needle is slidably mounted within the flow channel. A high-pressure gas inlet is provided on the side wall of the ejection chamber, communicating with the nozzle flow channel. A low-pressure gas inlet is provided on the side wall of the mixing chamber. The precision sliding drive mechanism for the nozzle needle controls its precise sliding.

[0008] This invention delivers mainstream hydrogen to the ejector chamber via a high-pressure gas inlet. A precise sliding drive mechanism for the nozzle needle accurately controls the movement of the nozzle needle in the nozzle channel according to the power of the hydrogen fuel cell, controlling the duty cycle of the nozzle needle opening. This achieves continuous variation of the variable-diameter flow channel diameter, allowing the mainstream hydrogen to flow out at high speed from the outlet of the variable-diameter flow channel. This also causes the secondary fluid from the low-pressure gas inlet to be entrained, achieving secondary flow ejection and a high ejection rate.

[0009] Meanwhile, the movement of the nozzle needle is controlled by the precise sliding drive mechanism of the nozzle needle, which controls the flow rate out of the variable diameter flow channel, thereby controlling the ratio of the secondary flow mass flow rate to the mainstream flow mass flow rate. Compared with the traditional method, there is no need to use a proportional valve, which can realize the flow rate adjustment and greatly reduce the cost.

[0010] The nozzle needle has a gradually decreasing diameter section at its outlet end facing the nozzle channel, and the outlet end of the nozzle channel is also a gradually decreasing diameter flow channel. The changing trend of the diameter-changing section is the same as the gradual change trend of the diameter-changing flow channel. Through the cooperation of the diameter-changing flow channel and the diameter-changing section, the outlet diameter of the diameter-changing flow channel can change continuously during the sliding process of the nozzle needle.

[0011] Meanwhile, by ensuring that the changing trend of the variable diameter section is the same as the gradual change trend of the variable diameter flow channel, the nozzle needle is prevented from hitting the side wall of the variable diameter flow channel during movement.

[0012] Preferably, the nozzle needle precision sliding drive mechanism includes an active rack, an active gear, a potentiometer, a passive gear, a passive rack, and a rotary motor. The active rack is fixedly mounted on the side wall of the starting end of the nozzle needle and is arranged along the length direction of the nozzle needle. The active gear meshes with the active rack. The output end of the rotary motor is fixedly connected to the middle of the active gear, and the motor end of the rotary motor is fixed on the side wall of the housing. The passive rack is mounted on the side wall of the starting end of the nozzle needle and is arranged along the length direction of the nozzle needle. The passive rack and the active rack are located on opposite sides of the nozzle needle. The passive gear meshes with the passive rack. The knob of the potentiometer is fixed to the middle of the passive gear. The potentiometer is fixed to the housing. The rotation of the motor is controlled by a controller, which is a mature existing technology and therefore will not be described in detail here.

[0013] This invention controls the rotation of a motor via a controller, which in turn controls the rotation of a drive gear, thereby controlling the left and right movement of a drive rack. This, in turn, drives the left and right movement of a nozzle needle, achieving continuous change in the outlet diameter of the variable-diameter flow channel. Simultaneously, the movement of the nozzle needle drives the movement of a driven rack, which in turn drives the rotation of the driven gear. The rotation of the driven gear causes a change in the potentiometer knob. The potentiometer transmits the gear rotation change to the controller, providing feedback on the extension and retraction stroke of the nozzle needle. This achieves automatic and precise control of the nozzle needle's movement. The rotary motor is a reversible geared motor with its own reduction gear, which slows down the rotation speed of the rotary motor, ensuring the controller has sufficient time to receive feedback information from the potentiometer, thus improving the precision and accuracy of control.

[0014] Preferably, a power-off disconnection mechanism is provided between the rotary motor and the drive gear. The power-off disconnection mechanism includes a rotating disk, a compression spring, an electromagnetic column, a guide column, an anti-detachment block, and a attracted block. The rotating disk is fixedly connected to the output end of the rotary motor and is arranged parallel to the drive gear. The compression spring is located between the rotating disk and the drive gear. One end of the compression spring is fixedly connected to the rotating disk, and the other end is fixedly connected to the drive gear. A through hole is opened in the middle of the drive gear, and the guide column passes through the through hole. One end of the guide column is fixedly connected to the side wall of the housing, and the other end is fixed to the anti-detachment block. The electromagnetic column is located on the side of the rotating disk near the drive gear. A magnetic suction groove is opened on the drive gear to cooperate with the electromagnetic column. The attracted block is located at the bottom of the magnetic suction groove. The attracted block can be made of iron.

[0015] Preferably, a compression spring is provided between the rear end of the nozzle needle and the housing.

[0016] This invention utilizes a power-off disconnection mechanism. In the event of a sudden power outage, the electromagnetic column loses power, and the compression spring springs the drive gear away, separating the drive gear from the rack. This allows the high-pressure gas inlet to move along with the nozzle needle to seal the nozzle opening, thus preventing high-pressure gas flow from continuing to enter the hydrogen fuel cell during a sudden power outage under high-power operation, which could damage the proton exchange membrane.

[0017] This invention uses a guide post to ensure that the drive gear remains on the same horizontal plane as the rotating disk when it is separated from the rotating disk by the elastic force of the compression spring, which facilitates the subsequent engagement of the electromagnetic post with the attracted block. An anti-detachment block prevents the drive gear from detaching from the guide post.

[0018] Preferably, a sealing telescopic tube is provided between the nozzle needle and the housing. The sealing telescopic tube is located in the ejector chamber and behind the high-pressure gas inlet. The sealing telescopic tube includes a flexible tube with a corrugated cross-section. One end of the flexible tube is sealed and fixedly connected to the side wall of the nozzle needle, and the other end of the flexible tube is fixedly connected to a fixing ring. The side wall of the fixing ring is sealed and fixedly connected to the side wall of the housing.

[0019] This invention utilizes a flexible, corrugated tube with a sealed telescopic tube, allowing the nozzle needle to move. Simultaneously, the sealed telescopic tube ensures both the movement of the nozzle needle and a tight seal, preventing hydrogen from entering the rear end of the tube. This isolates the electrical and mechanical components, preventing electrical malfunctions. Without a seal, hydrogen leakage is likely, and the generation of moisture during system operation could also cause short circuits in the electrical system. The enhanced seal makes the system safer to use.

[0020] Preferably, the nozzle needle is kept horizontal with the nozzle flow channel and located on the central axis of the nozzle flow channel to ensure uniform airflow.

[0021] Preferably, the nozzle needle is provided with a first balance slider behind the sealing telescopic tube, and the end of the nozzle needle is provided with a second balance slider.

[0022] This invention uses a design with two balancing sliders to keep the nozzle needle always balanced, preventing it from tilting and hitting the side wall of the nozzle flow channel during movement.

[0023] Both the first and second balance sliders include a slider body fixedly connected to the side wall of the nozzle needle. Two or more slider bodies are fixedly connected along the length direction. Each slider body has a ball groove on its side wall, and a ball is embedded in the ball groove. The ball can roll in the ball groove. Three or more ball grooves are formed along the circumferential direction of the slider body. This invention uses the slider body to fix the balance slider to the side wall of the nozzle needle, so that the slider body can move with the nozzle needle. Through the ball, the balance slider is slidably connected to the side wall of the housing, thereby realizing the sliding connection of the nozzle needle.

[0024] Preferably, the nozzle has an external thread on the outer wall corresponding to the first balancing slider, and the slider body has an internal thread that mates with the external thread.

[0025] The present invention, through the design of external and internal threads, allows the distance between the slider bodies of the first balance slider to be adjusted. According to the actual situation, the position of the slider body on the nozzle needle can be finely adjusted, so that the balance of the nozzle needle can be maintained more accurately.

[0026] Preferably, the diffusion chamber is funnel-shaped, allowing the mixed mainstream hydrogen gas and secondary flow to mix and diffuse.

[0027] Preferably, limiting blocks are provided on both sides of the active rack. The limiting blocks are fixed to the side wall of the nozzle needle. This can prevent the active gear from continuing to rotate after rotating to both sides of the active rack, which would cause the active gear to disengage from the active rack. It can also ensure that the second balance slider falls out of the groove, which would cause the nozzle needle to deviate from its sliding direction.

[0028] In summary, the beneficial effects of this invention are as follows:

[0029] 1. This invention delivers mainstream hydrogen to the ejector chamber via a high-pressure gas inlet. The nozzle needle precision sliding drive mechanism precisely controls the movement of the nozzle needle in the nozzle flow channel according to the power of the hydrogen fuel cell, controlling the opening degree of the nozzle needle. This achieves continuous change in the diameter of the variable-diameter flow channel, allowing the mainstream hydrogen to flow out at high speed from the outlet of the variable-diameter flow channel. This also causes the secondary fluid from the low-pressure gas inlet to be entrained, achieving the ejection of the secondary flow and a high ejection rate.

[0030] 2. This invention controls the movement of the nozzle needle through a precise sliding drive mechanism, thereby controlling the flow rate of the mainstream hydrogen gas flowing out of the outlet of the variable diameter flow channel, thus changing the pressure of the secondary flow. Compared with the traditional method, it eliminates the need for a proportional valve, enabling flow rate regulation and greatly reducing costs.

[0031] 3. This invention controls the rotation of a motor via a controller, which in turn controls the rotation of a drive gear, thereby controlling the left and right movement of a drive rack. This, in turn, drives the nozzle needle to move left and right, achieving continuous change in the outlet diameter of the variable diameter flow channel. Simultaneously, the movement of the nozzle needle drives the movement of a driven rack, which in turn drives the rotation of the driven gear. The rotation of the driven gear causes a change in the potentiometer knob. The potentiometer transmits the gear rotation change to the controller, providing feedback on the extension and retraction stroke of the nozzle needle, thus achieving automatic and precise control of the nozzle needle's movement.

[0032] 4. This invention utilizes a power-off disconnection mechanism. In the event of a sudden power outage, the electromagnetic column loses power, and the compression spring springs the drive gear away, causing the drive gear to separate from the rack. This pushes the compression spring, which in turn moves the nozzle needle due to its elasticity. Simultaneously, the nozzle needle is assisted by the high-pressure airflow, sealing the outlet of the variable-diameter flow channel. This prevents high-pressure airflow from continuing to enter the hydrogen fuel cell during a sudden power outage under high-power operation, thus preventing damage to the proton exchange membrane.

[0033] 5. This invention utilizes a flexible tube with a corrugated cross-section, allowing the nozzle needle to move. Simultaneously, the sealing and fixing of the flexible tube ensures both the movement of the nozzle needle and a tight seal, preventing hydrogen from entering the rear end of the flexible tube. This isolates the electrical and mechanical components, preventing electrical malfunctions. Without a seal, hydrogen leakage is likely, and the system will generate moisture during operation, potentially causing short circuits in the electrical components and affecting the safety of the ejector. Attached Figure Description

[0034] Figure 1 This is a cross-sectional schematic diagram of the ejector of the present invention;

[0035] Figure 2 This is a schematic diagram of the nozzle needle after it has retracted according to the present invention;

[0036] Figure 3 This is a three-dimensional schematic diagram of the first balancing slider of the present invention;

[0037] Figure 4 This is a cross-sectional schematic diagram of the nozzle needle precision sliding drive mechanism of Embodiment 1 of the present invention without a power-off disengagement mechanism;

[0038] Figure 5 This is a cross-sectional schematic diagram of the nozzle needle precision sliding drive mechanism of Embodiment 1 of the present invention, which is equipped with a power-off disconnection mechanism.

[0039] Figure 6 This is the present invention. Figure 5 An enlarged view of point A;

[0040] Figure 7 This is a cross-sectional schematic diagram of the power-off disconnection mechanism of the present invention after disengaging the drive gear;

[0041] Figure 8 This is a schematic diagram of the magnetic groove on the drive gear of the present invention. Detailed Implementation

[0042] The following specific embodiments are merely illustrative of the present invention and are not intended to limit the invention. After reading this specification, those skilled in the art can make modifications to these embodiments without contributing any inventive step, but such modifications are protected by patent law as long as they fall within the scope of the claims of the present invention.

[0043] The present invention will now be described in detail with reference to the accompanying drawings and embodiments. Example

[0044] like Figure 1-4As shown, an ejector for a hydrogen recirculation system in a hydrogen fuel cell includes a housing 1. Inside the housing are a nozzle needle 2, a nozzle needle precision sliding drive mechanism 5, and a nozzle 6. The housing 1 is divided from left to right into an ejection chamber 11, a mixing chamber 12, and a diffusion chamber 13. The diffusion chamber 13 is funnel-shaped. One end of the nozzle 6 is located inside the ejection chamber 11, and the other end extends into the mixing chamber 12. The nozzle 6 has a nozzle flow channel 90. The nozzle needle 2 is horizontally aligned with the nozzle flow channel 90 and is slidably mounted within the nozzle flow channel 90. The housing 1 has a high-pressure gas inlet 110 on the side wall of the ejector chamber 11, which is connected to the nozzle flow channel 90. The housing 1 also has a low-pressure gas inlet 120 on the side wall of the mixing chamber 12. A precise sliding drive mechanism 5 controls the precise sliding of the nozzle needle 2. This mechanism includes a drive rack 51, a drive gear 52, a potentiometer 53, a driven gear 54, a driven rack 55, and a rotary motor 56. The drive rack 51 is fixedly mounted on the nozzle needle 2. On the side wall at the starting end, the active rack 52 is arranged along the length direction of the nozzle needle 2. The active gear 52 meshes with the active rack 51. The output end of the rotary motor 56 is fixedly connected to the middle of the active gear 52. The motor end of the rotary motor 56 is fixed on the side wall of the housing 1. The passive rack 55 is arranged on the side wall at the starting end of the nozzle needle 2. The passive rack 55 is arranged along the length direction of the nozzle needle 2. The passive rack 55 and the active rack 51 are located on opposite sides of the nozzle needle 2. The passive gear 54 meshes with the passive rack 55. The knob of the potentiometer 53 is fixed in the middle of the passive gear. The potentiometer is fixed on the housing 1. The end of the nozzle needle 2 facing the outlet end of the nozzle flow channel 90 is a variable diameter section with a gradually decreasing diameter. The outlet end of the nozzle flow channel 90 is a variable diameter flow channel with a gradually decreasing diameter. The changing trend of the variable diameter section is the same as the gradual change trend of the variable diameter flow channel. Limiting blocks 520 are provided on both sides of the active rack 51. The limiting blocks 520 are fixed on the side wall of the nozzle needle 2.

[0045] like Figure 2-3As shown, a sealing telescopic tube 4 is provided between the nozzle needle 2 and the housing. The sealing telescopic tube 4 is located in the ejector chamber 11 and behind the high-pressure gas inlet 110. The sealing telescopic tube 4 includes a flexible tube 41 with a corrugated cross-section. One end of the flexible tube 41 is sealed and fixedly connected to the side wall of the nozzle needle 2, and the other end of the flexible tube 41 is fixedly connected to a fixing ring 42. The side wall of the fixing ring 42 is sealed and fixedly connected to the side wall of the housing 1. A first balance slider 21 is provided behind the sealing telescopic tube 4, and a second balance slider 22 is provided at the end of the nozzle needle 2. The first balance slider 21 and the second balance slider 22 are connected. Each balance slider 22 includes a slider body 221 fixedly connected to the side wall of the nozzle needle 2. Two or more slider bodies 221 are fixedly connected along the length direction. Each slider body 221 has a ball groove 222 on its side wall. A ball 223 is embedded in the ball groove 222 and can roll in the ball groove 222. Three or more ball grooves 222 are formed along the circumferential direction of the slider body 221. The nozzle needle 2 has an external thread 20 on the outer side wall corresponding to the first balance slider 21. The slider body 221 has an internal thread 220 that cooperates with the external thread 20. Example

[0046] Unlike Example 1, as Figure 5-8 As shown, a power-off disconnection mechanism 7 is provided between the rotary motor 56 and the drive gear 52. The power-off disconnection mechanism 7 includes a rotating disk 71, a compression spring 72, an electromagnetic column 73, a guide column 74, an anti-detachment block 75, and a suction block 76. The rotating disk 71 is fixedly connected to the output end of the rotary motor 56. The rotating disk 71 is arranged parallel to the drive gear 52. The compression spring 72 is located between the rotating disk 71 and the drive gear 52, and one end of the compression spring 72 is fixedly connected to the rotating disk 71. The other end of the compression spring 72 is fixedly connected to the drive gear 52. The drive gear 52 has a through hole 511 in the middle. The guide post 74 passes through the through hole 511. One end of the guide post 74 is fixedly connected to the side wall of the housing 1, and the other end is fixed to the anti-detachment block 75. The electromagnetic post 73 is located on the side of the rotating disk 71 near the drive gear 52. The drive gear 52 has a magnetic suction groove 510 that cooperates with the electromagnetic post 73. The bottom of the magnetic suction groove 510 is provided with the attracted block 76.

[0047] like Figure 1As shown, a push compression spring 200 is provided between the rear end of the nozzle needle 2 and the housing 1. When the nozzle needle precision sliding drive mechanism 5 is working under the power-off disconnection mechanism 7, the push compression spring 200 is in a compressed state. When the power-off disconnection mechanism 7 controls the active gear 52 to disengage from the active rack 51, the push compression spring 200 pushes the nozzle needle 2 to move due to its elasticity. At the same time, the nozzle needle 2 is assisted by the high-pressure airflow to close the outlet of the variable diameter flow channel, thereby preventing the high-pressure airflow from continuing to enter the hydrogen fuel cell when the power is suddenly cut off under high-power operation, which could damage the proton exchange membrane.

[0048] At the same time, when the vehicle is not level, the nozzle needle 2 will not move backward due to the elastic force after the valve controlling the hydrogen is closed, so that the outlet of the variable diameter flow channel will always be closed and the hydrogen remaining on the pipeline will not flow out from the outlet of the variable diameter flow channel.

[0049] Working principle: such as Figure 1-8 As shown, during use, the controller controls the rotation of motor 56 according to the power of the hydrogen fuel cell. Motor 56 controls the rotation of active gear 52, thereby controlling the left and right movement of active rack 52, which in turn drives nozzle needle 1 to move left and right to the required position. At the same time, the left and right movement of nozzle needle 2 drives the movement of passive rack 55, which in turn drives the rotation of passive gear 54. The rotation of passive gear 54 drives the change of potentiometer knob. Potentiometer 53 sends the rotation change of gear to the controller, which provides feedback on the extension and retraction stroke of nozzle needle 2. Then, the mainstream hydrogen gas entering from high-pressure gas inlet 110 is low-speed high-pressure gas. It is ejected from the variable diameter flow channel through the nozzle flow channel and forms a high-speed airflow at the nozzle outlet. Secondary fluid enters from low-pressure gas inlet 120, causing the secondary fluid to be entrained, thus achieving secondary flow entrainment. The two airflows are mixed in mixing chamber 12, and then enter diffusion chamber 13, where the speed and pressure gradually decrease synchronously. Finally, they flow out from the outlet into the fuel cell.

[0050] During operation, the electromagnetic column 73 is energized, the compression spring 72 is compressed, and the drive gear 52 engages with the rotating disk 71, enabling the motor to drive the drive gear 52 to rotate. In the event of a sudden power outage, the electromagnetic column 73 loses power, the compression spring 72 springs the drive gear 52 away, causing the drive gear 52 to separate from the rack. This pushes the compression spring 200, which in turn pushes the nozzle needle 2 to move. At the same time, the nozzle needle 2 is assisted by the high-pressure airflow to close the outlet of the variable diameter flow channel, thereby preventing high-pressure airflow from continuing to enter the hydrogen fuel cell during a sudden power outage under high-power operation, which could damage the proton exchange membrane.

Claims

1. An ejector for a hydrogen fuel cell hydrogen circulation system, characterized by, The utility model relates to a high -efficient air -gas mixing device, including the casing (1), nozzle needle (2), nozzle needle precision sliding drive mechanism (5), nozzle (6) are equipped with in the casing, the casing (1) is divided into the injection chamber (11), mixing chamber (12) and diffusion chamber (13) from the direction of left to right, one end of nozzle (6) is located in the injection chamber (11), the other end extends to mixing chamber (12) inside, nozzle (6) is equipped with nozzle runner (90) inside, nozzle needle (2) is slidably installed in nozzle runner (90), the high -pressure gas import (110) is set up on the lateral wall of injection chamber (11) of casing (1), the high -pressure gas import (110) with nozzle runner (90) intercommunication, the low -pressure gas import (120) is set up on the lateral wall of mixing chamber (12) of casing (1), nozzle needle precision sliding drive mechanism (5) control nozzle needle (2) precision sliding, nozzle needle precision sliding drive mechanism (5) includes driving rack (51), driving gear (52), potentiometer (53), passive gear (54), passive rack (55), rotary motor (56), the rotary motor (56) with driving gear (52) between being equipped with power-off decoupling mechanism (7), power-off decoupling mechanism (7) includes rotating disc (71), compression spring (72), electromagnetic column (73), guide column (74), anti -unhooking block (75), be absorbed block (76), rotating disc (71) with the output of rotary motor (56) fixed connection, rotating disc (71) with driving gear (52) parallelly arranged, compression spring (72) is set up between rotating disc (71) with driving gear (52), one end of compression spring (72) with rotating disc (71) fixed connection, the other end of compression spring (72) with driving gear (52) fixed connection, the middle part of driving gear (52) is equipped with through -hole (511), guide column (74) penetrates through through -hole (511), one end of guide column (74) with the lateral wall of casing (1) fixed connection, the other end fixed anti -unhooking block (75), electromagnetic column (73) is set up in the one side of rotating disc (71) close to driving gear (52), driving gear (52) is equipped with the magnetic attraction groove (510) of mutual cooperation with electromagnetic column (73) on, the groove bottom of magnetic attraction groove (510) is equipped with be absorbed block (76).

2. An ejector for a hydrogen fuel cell hydrogen circulation system according to claim 1, wherein The driving rack (51) is fixedly arranged on the side wall of the nozzle needle (2) at the starting end, the driving rack (51) is arranged along the length direction of the nozzle needle (2), the driving gear (52) is engaged with the driving rack (51), the output end of the rotary motor (56) is fixedly connected with the middle part of the driving gear (52), the motor end of the rotary motor (56) is fixed on the side wall of the shell (1), the driven rack (55) is arranged on the side wall of the nozzle needle (2) at the starting end, the driven rack (55) is arranged along the length direction of the nozzle needle (2), the driven rack (55) is located on the opposite sides of the nozzle needle (2) with the driving rack (51), the driven gear (54) is engaged with the driven rack (55), the knob of the potentiometer (53) is fixed in the middle part of the driven gear, and the potentiometer is fixed on the shell (1).

3. An ejector for a hydrogen fuel cell hydrogen circulation system according to claim 2, wherein The nozzle needle (2) and the shell are provided with a sealed telescopic pipe (4), the sealed telescopic pipe (4) is arranged in the injection chamber (11) and located at the left side of the high-pressure gas inlet (110), the sealed telescopic pipe (4) comprises a soft tube (41) with a wavy cross section, one end of the soft tube (41) is fixedly connected with the side wall of the nozzle needle (2), and the other end of the soft tube (41) is fixedly connected with a fixing ring (42), the side wall of the fixing ring (42) is fixedly connected with the side wall of the shell (1).

4. An ejector for a hydrogen fuel cell hydrogen circulation system according to claim 3, wherein The nozzle needle (2) and the nozzle flow channel (90) are kept horizontal.

5. An ejector for a hydrogen fuel cell hydrogen circulation system according to claim 4, wherein The nozzle needle (2) is provided with a first balance sliding block (21) at the left side of the sealed telescopic pipe (4), and the nozzle needle (2) is provided with a second balance sliding block (22) at the end.

6. An ejector for a hydrogen fuel cell hydrogen circulation system according to claim 5, wherein The first balance sliding block (21) and the second balance sliding block (22) each comprise a sliding block body (221) fixedly connected with the side wall of the nozzle needle (2), two or more than two sliding block bodies (221) are fixedly connected along the length direction, a ball groove (222) is formed in the side wall of each sliding block body (221), a ball (223) is embedded in the ball groove (222), the ball (223) can roll in the ball groove (222), and three or more than three ball grooves (222) are formed along the circumferential direction of the sliding block body (221).

7. An ejector for a hydrogen fuel cell hydrogen circulation system according to claim 6, wherein An external thread (20) is arranged on the outer side wall of the nozzle needle (2) corresponding to the first balance sliding block (21), and an internal thread (220) matched with the external thread (20) is arranged on the sliding block body (221).

8. An ejector for a hydrogen fuel cell hydrogen circulation system according to claim 1, wherein One end of the nozzle needle (2) towards the outlet end of the nozzle flow channel (90) is a variable diameter section with gradually reduced diameter, the outlet end of the nozzle flow channel (90) is a variable diameter flow channel with gradually reduced diameter, and the change trend of the variable diameter section is the same as the gradual change trend of the variable diameter flow channel.

9. An ejector for a hydrogen fuel cell hydrogen circulation system according to claim 1, wherein Limiting blocks (520) are arranged on both sides of the driving rack (51), and the limiting blocks (520) are fixed on the side wall of the nozzle needle (2).

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