A compact full-power coverage ejector structure

Abstract

The present invention discloses a compact full-power coverage ejector structure, which relates to the technical field of ejector structures. It includes a mixing chamber and a delivery chamber connected in communication. One end of the mixing chamber away from the delivery chamber is provided with a nozzle for delivering high-speed fluid, and a secondary hydrogen gas flow inlet for delivering low-speed fluid is provided on the side wall of the mixing chamber. The nozzle includes a conical section and a cylindrical section, and the conical section is close to the delivery chamber. This compact full-power coverage ejector structure, by setting structures such as a nozzle, a partition plate, and a needle valve, utilizes the pressure of high-speed fluid to adjust the nozzle opening in real time, realizes precise flow control within the full power range, adapts to different load requirements of fuel cells, and through the wide-range adjustment ability of the nozzle, realizes full-power coverage from low load to full load, avoiding the problem of efficiency decline of traditional ejectors at low loads, and improving the use efficiency of the compact full-power coverage ejector structure.

Description

Technical Field

[0001] The invention relates to the technical field of ejector structures, and in particular to a compact full-power coverage ejector structure. Background Art

[0002] When a hydrogen fuel cell is running, excess hydrogen is usually supplied to the anode to improve battery performance. In order to increase hydrogen utilization and discharge water and impurity gases accumulated at the anode to ensure efficient operation of the stack, a hydrogen circulation device (such as an ejector) is usually used to circulate excess hydrogen from the stack anode outlet back to the stack anode inlet to continue participating in the chemical reaction.

[0003] In the prior art, the ejector with adjustable nozzle adjusts the nozzle opening by placing a needle in the nozzle and using a motor to drive the needle to move in the nozzle. However, this design also has many problems. The motor is large, making it difficult to achieve a compact design, and the sealing is poor. The motor takes a long time to run and has a slow response speed, making it difficult to meet the needs of fuel cells for rapid changes in operating conditions. In addition, it is difficult to accurately control the moving distance of the needle during movement, the accuracy is low, and the efficiency needs to be improved.

[0004] Therefore, it is necessary to propose a compact full-power coverage ejector structure to solve the above problems. Summary of the invention

[0005] The purpose of the present invention is to provide a compact full-power coverage ejector structure to solve the problems that the motor is large in size, difficult to achieve compact design, and has poor sealing. The motor takes a long time to run and has a slow response speed, making it difficult to meet the needs of rapid changes in fuel cell operating conditions.

[0006] To achieve the above-mentioned object, the present invention provides the following technical solutions: a compact full-power covering ejector structure, comprising a mixing cavity and a delivery cavity which are connected to each other, wherein a nozzle for delivering high-speed fluid is arranged at one end of the mixing cavity away from the delivery cavity, and a secondary hydrogen gas inlet for delivering low-speed fluid is arranged on the side wall of the mixing cavity;

[0007] The nozzle comprises a conical section and a cylindrical section, wherein the conical section is close to the delivery cavity;

[0008] The conveying cavity is provided with a partition plate which is slidably disposed inside, and a needle valve which matches the tapered section is fixedly connected to the partition plate;

[0009] In the hydrogen circulation system of a hydrogen fuel cell, when high-speed fluid passes through the conical section, it accelerates due to the sudden reduction in the cross-sectional area of the flow channel and acts on the needle valve, pushing the needle valve and the partition to displace axially along the nozzle, opening the conical section. The high-speed fluid and the low-speed fluid entering through the secondary hydrogen gas inlet meet and stratify at the partition. Due to the shear effect of the high-speed fluid, eddies are formed at the edge of the partition, and the low-speed fluids on both sides are entrained and diverted. The mixed fluid after diversion enters the delivery cavity.

[0010] Preferably, a chute is provided on the inner wall of the delivery cavity, the partition is slidably arranged inside the chute, and a spring is arranged inside the chute.

[0011] Preferably, a soft sleeve is arranged inside the delivery cavity, and an inner sliding ring is slidably arranged inside the soft sleeve.

[0012] Preferably, an outer sliding ring is slidably arranged outside the delivery cavity, and the outer sliding ring and the inner sliding ring move synchronously by means of a magnetic component.

[0013] Preferably, an airbag is arranged inside the delivery cavity.

[0014] Preferably, the wall thickness of the inner ring of the airbag gradually thins from both sides to the middle.

[0015] Preferably, a flow guide strip is rotatably arranged on the inner wall of the conical section.

[0016] Preferably, a plurality of flow guide strips are provided.

[0017] Preferably, the angle between the flow guide strip and the direction of the high-speed fluid is between 15° and 45°.

[0018] Preferably, a control component for adjusting the inclination angle of the flow guide strip is arranged on the nozzle, and the control component includes a ring.

[0019] The technical effects and advantages of the present invention:

[0020] 1. By setting structures such as a nozzle, a partition, and a needle valve, the present invention utilizes the pressure of high-speed fluid to adjust the nozzle opening in real time, realizes precise flow control within the full power range, adapts to different load requirements of the fuel cell, and through the wide-range adjustment ability of the nozzle, realizes full power coverage from low load to full load, avoiding the problem of efficiency decline of traditional ejectors at low loads, and improving the use efficiency of the compact full-power coverage ejector structure;

[0021] 2. The needle valve can make the two fluids meet in a state conducive to mixing, reduce energy loss, quickly and evenly mix, shorten the mixing section, and make the overall structure more compact;

[0022] 3. The movement of the needle valve can change the nozzle outlet area. When the outlet area becomes smaller, the high-speed fluid is ejected at high speed, with stronger entrainment ability, rapid mixing, shortened mixing distance, and realizes the adjustment of flow velocity and enhanced entrainment.

[0023] 4. By setting structures such as a soft sleeve and an inner sliding ring, the present invention achieves the effect of doubling the turbulent intensity of the mixed fluid, and the path distance of the intensity doubling is adjustable, improving the flexibility of the ejector structure.

[0024] 5. By setting structures such as an airbag, and using the change in the wall thickness at the inner ring of the airbag to form a narrowing effect, the turbulent intensity of the mixed fluid is doubled, the collision frequency of fluid molecules is large, the mixing efficiency is improved, and the degree of narrowing can be adjusted by inflating or deflating the airbag, thereby adjusting the turbulent intensity.

[0025] 6. By setting structures such as a flow guide strip, the high-speed fluid forms a spiral flow path when ejected, which can efficiently entrain the low-speed fluid, and the spiral flow pattern helps to form a larger contact area between the high-speed fluid and the entrained fluid, promoting momentum exchange, thereby improving the entrainment efficiency, especially applicable to the hydrogen circulation system that requires rapid mixing, and the spiral flow path helps to reduce pressure fluctuations and improve the overall mixing effect, and the mixed fluid has higher energy and more stable performance.

[0026] 7. Structures such as the flow guide strip, the ring, and the connecting rod are close to the inner wall of the nozzle, occupying less internal space of the nozzle and reducing the influence on the high-speed fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] Figure 1 It is a schematic structural diagram of Embodiment 1 of the compact full-power coverage ejector structure of the present invention.

[0028] Figure 2 It is a schematic structural diagram of the mixing chamber and the conveying chamber of the present invention.

[0029] Figure 3 For the present invention Figure 2 The enlarged schematic diagram of the structure at A in.

[0030] Figure 4 For the present invention Figure 2 The enlarged schematic diagram of the structure at B in.

[0031] Figure 5 It is a schematic structural diagram of Embodiment 2 of the compact full-power coverage ejector structure of the present invention.

[0032] Figure 6 It is a schematic structural diagram of the mixing chamber and the nozzle of the present invention.

[0033] Figure 7 For the present invention Figure 6 The enlarged schematic diagram of the structure at C in.

[0034] Figure 8 This is a schematic diagram of the structure of Embodiment 3 of the compact full-power coverage ejector structure of the present invention.

[0035] Figure 9 This is a schematic diagram of the structures of the delivery cavity and the outflow cavity of the present invention.

[0036] Figure 10 For the present invention Figure 9 An enlarged schematic diagram of the structure at position D in it.

[0037] Figure 11 This is a schematic diagram of the structure of Embodiment 4 of the compact full-power coverage ejector structure of the present invention.

[0038] In the figure: 1, mixing cavity; 2, delivery cavity; 3, outflow cavity; 4, secondary hydrogen gas inlet; 5, nozzle; 501, conical section; 502, cylindrical section; 6, chute; 7, partition; 8, spring; 9, needle valve; 10, first adjustment assembly; 1001, hard sleeve; 1002, soft sleeve; 11, inner sliding ring; 12, outer sliding ring; 13, first magnet; 14, second magnet; 15, electric push rod; 16, second adjustment assembly; 1601, socket; 1602, airbag; 17, air pipe; 18, guide strip; 19, connecting plate; 20, sliding channel; 21, round block; 22, ring; 23, connecting rod; 24, through slot; 25, support block; 26, threaded sleeve. Detailed implementation manners

[0039] Embodiment 1. The present invention provides a compact full-power coverage ejector structure as Figures 1 to 4 shown, including a mixing cavity 1 and a delivery cavity 2. The mixing cavity 1 and the delivery cavity 2 are connected, and the inner diameter of the delivery cavity 2 is smaller than that of the mixing cavity 1; one end of the delivery cavity 2 far from the mixing cavity 1 is connected to an outflow cavity 3. The outflow cavity 3 is frustum-shaped, and the inner diameter of the end close to the delivery cavity 2 is small. The fluid passes through the mixing cavity 1, the delivery cavity 2, and the outflow cavity 3 in sequence, and can be used in the hydrogen circulation system of a hydrogen fuel cell or other circulation systems.

[0040] Referring to Figure 2 、 Figure 3 As shown in, a nozzle 5 for delivering high-speed fluid (primary flow) is installed at one end of the mixing cavity 1 far from the delivery cavity 2. The nozzle 5 includes a conical section 501 and a cylindrical section 502. The conical section 501 is close to the delivery cavity 2, and the inner diameter of the end of the conical section 501 close to the delivery cavity 2 is small, achieving the effect of accelerating the high-speed fluid.

[0041] Referring to Figure 1 、 Figure 2As shown, a secondary hydrogen gas flow inlet 4 for conveying low-speed fluid (secondary flow) is provided on the side wall of the mixed-flow cavity 1.

[0042] Referring to Figure 2 、 Figure 4 As shown, a partition 7 is slidably arranged inside the conveying cavity 2. The partition 7 is in a plate-like structure. A needle valve 9 that cooperates with the conical section 501 is fixedly connected to the partition 7. The needle valve 9 extends into the conical section 501. The needle valve 9 and the conical section 501 are concentrically arranged. One end of the needle valve 9 close to the conical section 501 is conical. The movement of the needle valve 9 can adjust the opening degree of the outlet position of the conical section 501. Two sliding grooves 6 are provided on the inner wall of the conveying cavity 2, and preferably two sliding grooves 6 are provided. The two sliding grooves 6 are evenly distributed around the axis of the conveying cavity 2. The two ends of the partition 7 are respectively slidably arranged inside the two sliding grooves 6 to ensure the stability of the sliding of the partition 7, thereby ensuring the stability of the needle valve 9.

[0043] Referring to Figure 4 As shown, a spring 8 is arranged inside the sliding groove 6. One end of the spring 8 is fixedly connected to the inner wall of the sliding groove 6, and the other end of the spring 8 is fixedly connected to the partition 7. The spring 8 is provided. When the ejector structure is in a shutdown state, the elastic supporting force of the spring 8 makes the needle valve 9 extend into the conical section 501 and closes the outlet position of the conical section 501.

[0044] During actual use, in the hydrogen circulation system, the high-speed fluid enters the nozzle 5, accelerates when passing through the conical section 501 due to the sudden reduction of the flow channel cross-sectional area, acts on the needle valve 9, and the acting force is greater than the elastic supporting force of the spring 8, pushing the needle valve 9 and the partition 7 to generate a displacement along the axial direction of the nozzle 5 towards the conveying cavity 2. The outlet position of the conical section 501 is opened for the high-speed fluid to accelerate and eject. A low-pressure area is formed inside the mixed-flow cavity 1, thereby sucking and driving the low-speed fluid from the secondary hydrogen gas flow inlet 4, realizing the mixing of the two fluids (high-speed fluid and low-speed fluid) to form a mixed fluid.

[0045] The high-speed fluid and the low-speed fluid entering through the secondary hydrogen gas flow inlet 4 meet in a stratified manner at the partition 7. Due to the shear effect of the high-speed fluid, eddies are formed at the edge of the partition 7, and the low-speed fluids on both sides are wrapped and diverted. The diverted mixed fluid enters the conveying cavity 2. Since the inner diameter of the conveying cavity 2 is smaller than the inner diameter of the mixed-flow cavity 1, the sudden change in size causes the turbulent intensity to double, and the fluid molecule collision frequency is increased to 3 to 5 times that of the conventional working condition. This enhanced mixing mechanism enables hydrogen and the carrier gas to complete molecular-scale mixing within milliseconds, shortens the length of the mixing section, and improves the power coverage rate of the hydrogen circulation system.

[0046] In addition, during use, when the pressure of the high-speed fluid increases, the needle valve 9 and the partition 7 are displaced a relatively large distance towards the conveying cavity 2. Since one end of the needle valve 9 close to the conical section 501 is conical, the opening degree at the outlet position of the conical section 501 becomes larger; when the pressure decreases, the restoring elastic force of the spring 8 causes the needle valve 9 and the partition 7 to reset, making the opening degree at the outlet position of the conical section 501 smaller, thus forming a closed-loop feedback mechanism, that is, automatically adjusting according to the pressure of the high-speed fluid to achieve dynamic balance.

[0047] By setting up structures such as the nozzle 5, the partition 7, and the needle valve 9, and utilizing the pressure of the high-speed fluid, the opening degree of the nozzle 5 is adjusted in real time to achieve precise flow control within the full power range, adapt to different load requirements of the fuel cell, and through the wide range of adjustment capabilities of the nozzle 5, achieve full power coverage from low load to full load, avoid the problem of efficiency decline of traditional ejectors at low loads, and improve the service efficiency of the compact full-power coverage ejector structure.

[0048] The needle valve 9 can make the two fluids meet in a state conducive to mixing, reduce energy loss, mix quickly and evenly, shorten the mixing section, and make the overall structure more compact.

[0049] In addition, the movement of the needle valve 9 can change the outlet area of the nozzle 5. When the outlet area becomes smaller, the high-speed fluid shoots out at high speed, the entrainment ability becomes stronger, it mixes quickly, and the mixing distance is shortened, realizing the adjustment of the flow velocity to enhance entrainment.

[0050] Example 2, the present invention provides a compact full-power coverage ejector structure as Figures 5 to 7 shown. A first adjustment component 10 is arranged inside the conveying cavity 2. The first adjustment component 10 includes a hard sleeve 1001 and a soft sleeve 1002. The hard sleeve 1001 is inserted inside the conveying cavity 2, and the soft sleeve 1002 is fixedly connected to the inner ring of the hard sleeve 1001. The soft sleeve 1002 can use rubber material.

[0051] During specific use, a threaded connection structure can be set between the conveying cavity 2 and the outflow cavity 3. After installing the first adjustment component 10, the outflow cavity 3 is then docked on the conveying cavity 2.

[0052] An inner sliding ring 11 is slidably arranged inside the soft sleeve 1002, and the inside of the soft sleeve 1002 is in a saturated state and is not prone to wrinkling. Refer to Figure 6 、 Figure 7 as shown. At the left position of the inner sliding ring 11, the inner circle of the soft sleeve 1002 gradually narrows along the flow direction of the mixed fluid, making the turbulence intensity of the mixed fluid double when passing through this area, and the collision frequency of fluid molecules is relatively large, improving the mixing effect.

[0053] Since the inner sliding ring 11 is designed to be sliding inside the soft sleeve 1002, when the inner sliding ring 11 moves to the left half position of the soft sleeve 1002, the gradually narrowing distance becomes shorter, which is suitable for low-load situations, that is, situations where the flow rates of the high-speed fluid and the low-speed fluid are relatively low. At this time, the high-speed fluid and the low-speed fluid are easier to mix, and there is no need for a long intensity multiplication path; when the inner sliding ring 11 moves to the right half position of the soft sleeve 1002, the gradually narrowing distance becomes longer, which is suitable for high-load situations, that is, situations where the flow rates of the high-speed fluid and the low-speed fluid are relatively high. At this time, there is a long intensity multiplication path, which improves the mixing efficiency of the high-speed fluid and the low-speed fluid.

[0054] By setting structures such as the soft sleeve 1002 and the inner sliding ring 11, the present invention achieves the effect of doubling the turbulent intensity of the mixed fluid, and the distance of the intensity multiplication path is adjustable, which improves the flexibility of the use of the ejector structure.

[0055] At the same time, the inner sliding ring 11 slides back and forth inside the soft sleeve 1002, which can cause the inner ring of the soft sleeve 1002 to vibrate, shake off impurities, and facilitate subsequent cleaning and other treatments of the ejector structure by the operator.

[0056] Refer to Figure 6 、 Figure 7 As shown in

[0057] An outer sliding ring 12 is slidably arranged outside the conveying cavity 2. The outer sliding ring 12 and the inner sliding ring 11 move synchronously by using a magnetic force assembly. The magnetic force assembly is arranged in multiple groups. The magnetic force assembly includes a first magnet 13 and a second magnet 14. The first magnet 13 is fixedly embedded on the outer ring of the inner sliding ring 11, and the second magnet 14 is fixedly embedded on the inner ring of the outer sliding ring 12. The magnetic properties of the mutually approaching surfaces of the first magnet 13 and the second magnet 14 are opposite, and they are attracted and matched with appropriate magnetic force.

[0058] Refer to Figure 6 、 Figure 7 As shown in

[0059] On the outer wall of the conveying cavity 2, an electric push rod 15 is fixedly connected. The outer sliding ring 12 is fixedly connected to the telescopic end of the electric push rod 15. The electric push rod 15 is used to drive the outer sliding ring 12 to move, thereby driving the inner sliding ring 11 to move.

[0060] Embodiment 3, the present invention provides a compact full-power coverage ejector structure as shown in Figures 8 to 10 Inside the delivery cavity 2, a second adjustment assembly 16 is provided. The second adjustment assembly 16 includes a socket 1601 and an airbag 1602. The socket 1601 is inserted into the inside of the delivery cavity 2, and the airbag 1602 is fixedly connected to the inner ring of the socket 1601. The airbag 1602 can be made of rubber material. Specifically, when in use, the second adjustment assembly 16 can also be installed inside the delivery cavity 2 by means of assembly.

[0061] Referring to Figure 9 、 Figure 10 As shown in, the wall thickness at the inner ring of the airbag 1602 gradually thins from both sides to the middle. A trachea 17 is threadedly connected to the outer wall of the socket 1601. The trachea 17 is communicated with the airbag 1602. A through hole for the trachea 17 to pass through is provided on the wall of the delivery cavity 2. The airbag 1602 is connected to an external factory gas delivery pipeline by means of the trachea 17. In actual use, a solenoid valve (not shown in the figure) is provided on the trachea 17, so that the airbag 1602 can maintain an inflated state, etc.

[0062] When inflating the airbag 1602 through the trachea 17, since the wall thickness at the inner ring of the airbag 1602 gradually thins from both sides to the middle, the deformation degree at the thin part is greater than that at the thick part, and then the solenoid valve is closed. Referring to Figure 10 , at the left half position of the airbag 1602, the inner ring of the airbag 1602 gradually narrows along the flow direction of the mixed fluid, doubling the turbulence intensity of the mixed fluid, increasing the fluid molecule collision frequency, and improving the mixing effect; and inflating or deflating the airbag 1602 can adjust the degree of narrowing, thereby adjusting the turbulence intensity.

[0063] Moreover, the thin part of the inner ring of the airbag 1602 can be adjusted according to specific usage conditions. For example, it is set at a position close to the outflow cavity 3, which is suitable for a hydrogen circulation system that is continuously under high load. Therefore, this embodiment is particularly suitable for a hydrogen circulation system with small load changes.

[0064] In addition, a pressure sensor or the like can be provided at the trachea 17 and other structures to monitor the pressure inside the airbag 1602.

[0065] The present invention forms a narrowing effect by setting structures such as the airbag 1602 and using the change in the wall thickness at the inner ring of the airbag 1602, doubling the turbulence intensity of the mixed fluid, increasing the fluid molecule collision frequency, improving the mixing efficiency, and inflating or deflating the airbag 1602 can adjust the degree of narrowing, thereby adjusting the turbulence intensity.

[0066] At the same time, by reciprocally inflating and inhaling the airbag 1602, the inner ring of the airbag 1602 can be made to vibrate, shaking off impurities, facilitating subsequent cleaning and other treatments by operators for the ejector structure.

[0067] Example 4, the present invention provides a compact full-power coverage ejector structure as shown in Figure 11 Figure 4. A plurality of flow guiding strips 18 are rotatably arranged on the inner wall of the conical section 501, and the plurality of flow guiding strips 18 are evenly distributed around the inner wall of the conical section 501.

[0068] When the flow guiding strips 18 are inclined, the high-speed fluid passes through the conical section 501. Under the guiding action of the flow guiding strips 18, the high-speed fluid forms a spiral flow path when ejected, which can efficiently entrain the low-speed fluid, and the spiral flow mode helps to form a larger contact area between the high-speed fluid and the entrained fluid, promoting momentum exchange, thereby improving the entrainment efficiency, especially suitable for hydrogen circulation systems that require rapid mixing.

[0069] It should be noted that the angle between the flow guiding strip 18 and the direction of the high-speed fluid is usually between 15° and 45° to obtain a better spiral effect, which can be adjusted according to specific usage conditions.

[0070] In addition, the spiral flow path helps to reduce pressure fluctuations and improve the overall mixing effect, and the mixed fluid has higher energy and more stable performance.

[0071] Referring to Figure 11 Figure 5, to realize the adjustment of the inclination angle of the flow guiding strip 18, a control assembly is provided. The control assembly includes a ring 22, the ring 22 is arranged inside the cylindrical section 502, and the ring 22 is close to the conical section 501. One end of the flow guiding strip 18 close to the cylindrical section 502 is fixedly connected with a connecting plate 19. The flow guiding strip 18 can be made of rubber material. A sliding channel 20 is opened on the connecting plate 19, and a round block 21 is slidably connected inside the sliding channel 20. The round block 21 is fixedly connected to the ring 22.

[0072] Referring to Figure 11 Figure 6, a connecting rod 23 is fixedly connected to the side of the ring 22 facing away from the conical section 501. The connecting rod 23 is attached to the inner wall of the cylindrical section 502. A threaded sleeve 26 is threadedly connected to the outside of the cylindrical section 502. A through groove 24 is opened on the cylindrical section 502, and a support block 25 is arranged inside the through groove 24. One end of the support block 25 is fixedly connected to the connecting rod 23, and the other end of the support block 25 is fixedly connected to the threaded sleeve 26. And the pitch of the thread structure between the threaded sleeve 26 and the cylindrical section 502 is small. When the threaded sleeve 26 is rotated to drive the ring 22 to rotate, only a small displacement will occur.

[0073] When the threaded sleeve 26 is rotated, it will drive the ring 22 to rotate synchronously through the support block 25 and the connecting rod 23. The ring 22 drives the round block 21 to move, and the round block 21 slides inside the sliding channel 20. The connecting plate 19 is used to adjust the inclination angle of the diversion strip 18, and the diversion strip 18 remains in contact with the inner wall of the conical section 501, so as to adjust the spiral effect formed by the high-speed fluid. For example, when the fluid flow rate is low, it is easy to mix and there is no obvious spiral effect. The inclination angle of the diversion strip 18 can be made smaller. At the same time, structures such as the diversion strip 18, the ring 22, and the connecting rod 23 are close to the inner wall of the nozzle 5, occupying less space inside the nozzle 5 and reducing the impact on the high-speed fluid.

[0074] In addition, a rubber pad and the like are provided at the end of the threaded sleeve 26 to prevent gas leakage. The friction coefficient of the threaded structure between the threaded sleeve 26 and the cylindrical section 502 is appropriate, and the threaded sleeve 26 will not rotate randomly. An automatic driving mechanism including a motor and the like can be provided outside the threaded sleeve 26 to cooperate with the rotation of the threaded sleeve 26 to achieve the effect of automatic adjustment, which can be adjusted according to the specific use situation.

Claims

1. A compact full-power coverage ejector structure, comprising a mixed-flow cavity (1) and a delivery cavity (2) connected and arranged, and characterized in that: One end of the mixed-flow cavity (1) far from the conveying cavity (2) is provided with a nozzle (5) for conveying high-speed fluid, and a secondary hydrogen gas flow inlet (4) for conveying low-speed fluid is arranged on the side wall of the mixed-flow cavity (1); The nozzle (5) includes a conical section (501) and a cylindrical section (502), wherein the conical section (501) is close to the conveying cavity (2); A partition plate (7) is slidably arranged inside the conveying cavity (2), and a needle valve (9) matched with the conical section (501) is fixedly connected to the partition plate (7); In the hydrogen circulation system of a hydrogen fuel cell, when the high-speed fluid passes through the conical section (501), it accelerates due to the sudden reduction of the flow channel cross-sectional area, acts on the needle valve (9), and pushes the needle valve (9) and the partition plate (7) to generate displacement along the axial direction of the nozzle (5), the conical section (501) opens, and the high-speed fluid and the low-speed fluid entering through the secondary hydrogen gas flow inlet (4) are stratified and meet at the partition plate (7). Due to the shear effect of the high-speed fluid, eddy currents are formed at the edge of the partition plate (7), and the low-speed fluids on both sides are wrapped and diverted. The mixed fluid after diversion enters the conveying cavity (2).

2. A compact full-power coverage ejector structure according to claim 1, characterized in that: A chute (6) is formed on the inner wall of the conveying cavity (2), the partition plate (7) is slidably arranged inside the chute (6), and a spring (8) is arranged inside the chute (6).

3. A compact full-power coverage ejector structure according to claim 1, characterized in that: A soft sleeve (1002) is arranged inside the conveying cavity (2), and an inner sliding ring (11) is slidably arranged inside the soft sleeve (1002).

4. A compact full-power coverage ejector structure according to claim 3, characterized in that: An outer sliding ring (12) is slidably arranged outside the conveying cavity (2), and the outer sliding ring (12) and the inner sliding ring (11) move synchronously by means of a magnetic force assembly.

5. A compact full-power coverage ejector structure according to claim 1, characterized in that: An airbag (1602) is arranged inside the conveying cavity (2).

6. A compact full-power coverage ejector structure according to claim 5, characterized in that: The wall thickness of the inner ring of the airbag (1602) gradually becomes thinner from both sides to the middle.

7. A compact full-power coverage ejector structure according to claim 1, characterized in that: A flow guiding strip (18) is rotatably arranged on the inner wall of the conical section (501).

8. A compact full-power coverage ejector structure according to claim 7, characterized in that: A plurality of the flow guiding strips (18) are provided.

9. A compact full-power coverage ejector structure according to claim 7, characterized in that: The included angle between the flow guiding strip (18) and the direction of the high-speed fluid is between 15° and 45°.

10. A compact full-power coverage ejector structure according to claim 7, characterized in that: A control assembly for adjusting the inclination angle of the flow guiding strip (18) is arranged on the nozzle (5), and the control assembly includes a ring (22).

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