Compact full-power coverage ejector structure

Abstract

The invention discloses a compact type full-power coverage ejector structure, and relates to the technical field of ejector structures, the compact type full-power coverage ejector structure comprises a flow mixing cavity and a conveying cavity which are arranged in a communicating mode, and a nozzle used for conveying high-speed fluid is arranged at the end, away from the conveying cavity, of the flow mixing cavity; a secondary hydrogen flow inlet for conveying low-speed fluid is formed in the side wall of the mixed flow cavity; the nozzle comprises a conical section and a cylindrical section, wherein the conical section is close to the conveying cavity. According to the compact full-power coverage ejector structure, the nozzle, the partition plate, the needle valve and other structures are arranged, the opening degree of the nozzle is adjusted in real time through the pressure of high-speed fluid, accurate flow control within the full-power range is achieved, different load requirements of a fuel cell are met, and the flow rate is adjusted through the wide-range adjusting capacity of the nozzle. Full-power coverage from low load to full load is achieved, the problem that the efficiency of a traditional ejector is reduced when the load is low is solved, and the use efficiency of the compact full-power coverage ejector structure is improved.

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 fast-changing fuel cell 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; The nozzle comprises a conical section and a cylindrical section, wherein the conical section is close to the delivery cavity; 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; In the hydrogen circulation system of a hydrogen fuel cell, when a high-speed fluid passes through a conical section, it is accelerated due to the sudden decrease in the cross-sectional area of ​​the flow channel, and acts on the needle valve, pushing the needle valve and the partition to displace along the axial direction of the nozzle. The conical section opens, and the high-speed fluid and the low-speed fluid entering through the secondary hydrogen flow inlet are layered and intersected at the partition. Due to the shear effect of the high-speed fluid, a vortex is 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.

[0007] Preferably, a chute is formed on the inner wall of the conveying cavity, the partition plate is slidably arranged inside the chute, and a spring is arranged inside the chute.

[0008] Preferably, a soft sleeve is arranged inside the conveying cavity, and an inner sliding ring is slidably arranged inside the soft sleeve.

[0009] Preferably, an outer sliding ring is slidably arranged outside the conveying cavity, and the outer sliding ring and the inner sliding ring are synchronously moved by a magnetic component.

[0010] Preferably, an air bag is arranged inside the conveying cavity.

[0011] Preferably, the wall thickness of the inner ring of the air bag gradually becomes thinner from both sides to the middle.

[0012] Preferably, a flow guiding strip is rotatably arranged on the inner wall of the conical section.

[0013] Preferably, a plurality of flow guiding strips are arranged.

[0014] Preferably, the included angle between the flow guiding strip and the direction of the high-speed fluid is between 15° and 45°.

[0015] Preferably, a control component for adjusting the inclination angle of the flow guiding strip is arranged on the nozzle, and the control component includes a ring.

[0016] The technical effects and advantages of the present invention are as follows: 1. By arranging structures such as a nozzle, a partition plate 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 fuel cells, and realizes full power coverage from low load to full load through the wide range of adjustment capabilities of the nozzle, 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; 2. The needle valve can make the two fluids meet in a state conducive to mixing, reduce energy loss, quickly and uniformly mix, shorten the mixing section, and make the overall structure more compact; 3. The movement of the needle valve can change the nozzle outlet area. When the outlet area becomes smaller, the high-speed fluid shoots out at a high speed, the entrainment ability becomes stronger, and the mixing is rapid, shortening the mixing distance, realizing the adjustment of flow velocity and enhancing the entrainment; 4. By arranging structures such as a soft sleeve and an inner sliding ring, the present invention achieves the effect of doubling the turbulence intensity of the mixed fluid, and the path distance of the intensity doubling is adjustable, improving the flexibility of the use of the ejector structure; 5. By providing structures such as airbags, and using the change in the wall thickness of the inner ring of the airbag to form a narrowing effect, the turbulence intensity of the mixed fluid is doubled, the collision frequency of fluid molecules is relatively high, the mixing efficiency is improved, and the degree of narrowing can be adjusted by inflating or deflating the airbag, thereby adjusting the turbulence intensity. 6. By providing structures such as flow guide bars, a spiral flow path is formed when the high-speed fluid is ejected, which can efficiently entrain the low-speed fluid. Moreover, 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. It is especially suitable for hydrogen circulation systems that require rapid mixing. Additionally, 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. 7. Structures such as flow guide bars, rings, and connecting rods are attached close to the inner wall of the nozzle, occupying less internal space of the nozzle and reducing the impact on the high-speed fluid. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] Figure 1 It is a schematic structural diagram of Embodiment 1 of the compact full-power coverage ejector structure of the present invention.

[0018] Figure 2 It is a schematic structural diagram of the mixing chamber and the delivery chamber of the present invention.

[0019] Figure 3 For the present invention Figure 2 A magnified schematic diagram of the structure at A in the figure.

[0020] Figure 4 For the present invention Figure 2 A magnified schematic diagram of the structure at B in the figure.

[0021] Figure 5 It is a schematic structural diagram of Embodiment 2 of the compact full-power coverage ejector structure of the present invention.

[0022] Figure 6 It is a schematic structural diagram of the mixing chamber and the nozzle of the present invention.

[0023] Figure 7 For the present invention Figure 6 A magnified schematic diagram of the structure at C in the figure.

[0024] Figure 8 It is a schematic structural diagram of Embodiment 3 of the compact full-power coverage ejector structure of the present invention.

[0025] Figure 9 It is a schematic structural diagram of the delivery chamber and the outflow chamber of the present invention.

[0026] Figure 10 For the present invention Figure 9 A magnified schematic diagram of the structure at D in the figure.

[0027] Figure 11 This is a schematic structural diagram of Embodiment 4 of the compact full-power coverage ejector structure of the present invention.

[0028] In the figure: 1, mixing flow cavity; 2, conveying cavity; 3, outflow cavity; 4, secondary hydrogen gas flow inlet; 5, nozzle; 501, conical section; 502, cylindrical section; 6, chute; 7, partition board; 8, spring; 9, needle valve; 10, first adjustment component; 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 component; 1601, socket; 1602, airbag; 17, air pipe; 18, guiding strip; 19, connecting plate; 20, sliding channel; 21, round block; 22, ring; 23, connecting rod; 24, through groove; 25, support block; 26, threaded sleeve. Specific implementation mode

[0029] Embodiment 1, the present invention provides a compact full-power coverage ejector structure as shown in Figures 1 to 4 which includes a mixing flow cavity 1 and a conveying cavity 2. The mixing flow cavity 1 and the conveying cavity 2 are communicated, and the inner diameter of the conveying cavity 2 is smaller than that of the mixing flow cavity 1; one end of the conveying cavity 2 far from the mixing flow cavity 1 is communicated with an outflow cavity 3. The outflow cavity 3 is frustum-shaped, and the inner diameter of the end close to the conveying cavity 2 is small. The fluid passes through the mixing flow cavity 1, the conveying 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.

[0030] Referring to Figure 2 and Figure 3 as shown in, a nozzle 5 for conveying high-speed fluid (primary flow) is installed at one end of the mixing flow cavity 1 far from the conveying cavity 2. The nozzle 5 includes a conical section 501 and a cylindrical section 502. The conical section 501 is close to the conveying cavity 2, and the inner diameter of the end of the conical section 501 close to the conveying cavity 2 is small, achieving the effect of accelerating the high-speed fluid.

[0031] Referring to Figure 1 and Figure 2 as shown in, a secondary hydrogen gas flow inlet 4 for conveying low-speed fluid (secondary flow) is provided on the side wall of the mixing flow cavity 1.

[0032] Referring to Figure 2 and Figure 4As shown in the figure, a partition plate 7 is slidably arranged inside the conveying cavity 2. The partition plate 7 is of a plate-like structure. A needle valve 9 that cooperates with the conical section 501 is fixedly connected to the partition plate 7. The needle valve 9 extends into the conical section 501. The needle valve 9 is concentrically arranged with the conical section 501. 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. Chutes 6 are formed on the inner wall of the conveying cavity 2. Preferably, there are two chutes 6, and the two chutes 6 are evenly distributed around the axis of the conveying cavity 2. The two ends of the partition plate 7 are respectively slidably arranged inside the two chutes 6 to ensure the stability of the sliding of the partition plate 7, thereby ensuring the stability of the needle valve 9.

[0033] As shown in Figure 4 the figure, a spring 8 is arranged inside the chute 6. One end of the spring 8 is fixedly connected to the inner wall of the chute 6, and the other end of the spring 8 is fixedly connected to the partition plate 7. By arranging the spring 8, 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.

[0034] 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, and 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 plate 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, and a low-pressure area is formed in the mixing cavity 1, so that the secondary hydrogen gas flow inlet 4 sucks in and drives the low-speed fluid, realizing the mixing of the two fluids (high-speed fluid and low-speed fluid) to form a mixed fluid.

[0035] The high-speed fluid and the low-speed fluid entering through the secondary hydrogen gas flow inlet 4 meet and merge in layers at the partition plate 7. Due to the shear effect of the high-speed fluid, eddies are formed at the edge of the partition plate 7, and the low-speed fluids on both sides are wrapped and separated. The separated mixed fluid enters the conveying cavity 2. Since the inner diameter of the conveying cavity 2 is smaller than the inner diameter of the mixing cavity 1, the sudden change in size causes the turbulent intensity to double, and the collision frequency of fluid molecules is increased to 3-5 times that of the conventional working condition. This enhanced mixing mechanism enables hydrogen and 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.

[0036] In addition, during use, when the pressure of the high-speed fluid increases, the needle valve 9 and the partition plate 7 displace 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 of the outlet position of the conical section 501 becomes larger; when the pressure decreases, the reset elastic force of the spring 8 makes the needle valve 9 and the partition plate 7 reset, making the opening degree of 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.

[0037] By setting up structures such as nozzle 5, partition plate 7, and needle valve 9, and utilizing the pressure of high-speed fluid, the opening degree of nozzle 5 is adjusted in real time, achieving precise flow control within the full power range, adapting to different load requirements of fuel cells. Moreover, through the wide-range adjustment ability of nozzle 5, full power coverage from low load to full load is realized, avoiding the problem of efficiency decline of traditional ejectors at low loads, and improving the utilization efficiency of the compact full-power coverage ejector structure.

[0038] The needle valve 9 enables the two fluids to meet in a state conducive to mixing, reducing energy loss, achieving rapid and uniform mixing, shortening the mixing section, and making the overall structure more compact.

[0039] 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, with stronger entrainment ability, rapid mixing, and shortened mixing distance, realizing the adjustment of flow velocity and enhanced entrainment.

[0040] Example 2, the present invention provides a compact full-power coverage ejector structure as shown in Figures 5 to 7 Inside the conveying cavity 2, a first adjustment component 10 is provided. The first adjustment component 10 includes a rigid sleeve 1001 and a soft sleeve 1002. The rigid sleeve 1001 is inserted into the inside of the conveying cavity 2, and the soft sleeve 1002 is fixedly connected to the inner ring of the rigid sleeve 1001. The soft sleeve 1002 can be made of rubber material.

[0041] Specifically in 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.

[0042] 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. Referring to Figure 6 、 Figure 7 As shown in, on the left side 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.

[0043] 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 section 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 doubling path; when the inner sliding ring 11 moves to the right half section 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 longer intensity doubling path, improving the mixing efficiency of the high-speed fluid and the low-speed fluid.

[0044] 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 path distance of the intensity doubling is adjustable, improving the flexibility of the ejector structure in use.

[0045] 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 operators to clean and process the ejector structure.

[0046] Refer to Figure 6 、 Figure 7 As shown in

[0047] In addition, structures such as ball bearings can be provided at positions such as the inner ring of the outer sliding ring 12 to reduce friction, which can be adjusted according to specific situations. The materials of the conveying cavity 2, the hard sleeve 1001, etc. that are not affected by magnetism can be used, such as non-magnetic stainless steel with appropriate thickness.

[0048] Refer to Figure 6 、 Figure 7 As shown in

[0049] In specific use, the electric push rod 15 can cooperate with the gas flow sensor in the hydrogen circulation system, and the electric push rod 15 can be controlled by a controller or the like to achieve the effect of automatic adjustment of the inner sliding ring 11. The controller, the gas flow sensor and their working principles are all common existing technologies and will not be elaborated here.

[0050] Embodiment 3, the present invention provides a compact full-power coverage ejector structure as shown in Figures 8 to 10 . A second adjustment component 16 is arranged inside the conveying cavity 2. The second adjustment component 16 includes an insertion sleeve 1601 and an airbag 1602. The insertion sleeve 1601 is inserted inside the conveying cavity 2, and the airbag 1602 is fixedly connected to the inner ring of the insertion sleeve 1601. The airbag 1602 can be made of rubber material. In specific use, the second adjustment component 16 can also be installed inside the conveying cavity 2 by means of assembly.

[0051] Refer to Figure 9 、Figure 10 As shown, 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 communicates with the airbag 1602. A through hole for the trachea 17 to pass through is provided on the wall of the conveying cavity 2. The airbag 1602 is connected to an external factory gas conveying pipeline by the trachea 17. During actual use, a solenoid valve (not shown in the figure) is provided on the trachea 17, enabling the airbag 1602 to maintain an inflated state and so on.

[0052] 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 degree of deformation at the thinner part is greater than that at the thicker part, and then the solenoid valve is closed. Refer to Figure 10 , at the left half section 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, with a relatively high frequency of fluid molecule collisions, improving the mixing effect; and inflating or deflating the airbag 1602 can adjust the degree of narrowing, thereby adjusting the turbulence intensity.

[0053] Moreover, the thinner 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 a relatively high load. Therefore, this embodiment is particularly suitable for a hydrogen circulation system with relatively small load variations.

[0054] In addition, a pressure sensor or the like can be provided at structures such as the trachea 17 to monitor the pressure inside the airbag 1602.

[0055] By providing structures such as the airbag 1602 in the present invention, and using the change in the wall thickness at the inner ring of the airbag 1602 to form a narrowing effect, the turbulence intensity of the mixed fluid is doubled, the frequency of fluid molecule collisions is relatively high, improving the mixing efficiency, and inflating or deflating the airbag 1602 can adjust the degree of narrowing, thereby adjusting the turbulence intensity.

[0056] Meanwhile, by reciprocally inflating and sucking 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 on the ejector structure.

[0057] Embodiment 4, the present invention provides a compact full-power coverage ejector structure as shown in Figure 11 , a flow guiding strip 18 is rotatably provided on the inner wall of the conical section 501. There are multiple flow guiding strips 18, and the multiple flow guiding strips 18 are evenly distributed around the inner wall of the conical section 501.

[0058] When the diversion strip 18 is inclined, the high-speed fluid passes through the conical section 501. Under the guiding action of the diversion strip 18, the high-speed fluid forms a spiral flow path when ejected, which can efficiently entrain the low-speed fluid. Moreover, 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 suitable for the hydrogen circulation system that requires rapid mixing.

[0059] It should be noted that the angle between the diversion 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 the specific usage situation.

[0060] 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.

[0061] Refer to Figure 11 As shown in , to realize the adjustment of the inclination angle of the diversion strip 18, a control component is provided. The control component includes a circular ring 22. The circular ring 22 is arranged inside the cylindrical section 502 and is close to the conical section 501. One end of the diversion strip 18 close to the cylindrical section 502 is fixedly connected with a connecting plate 19. The diversion strip 18 can be made of rubber material. A sliding channel 20 is opened on the connecting plate 19, and a circular block 21 is slidably connected inside the sliding channel 20. The circular block 21 is fixedly connected to the circular ring 22.

[0062] Refer to Figure 11 As shown in , a connecting rod 23 is fixedly connected to the side of the circular 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. Moreover, 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 circular ring 22 to rotate, only a small displacement will occur.

[0063] When the threaded sleeve 26 is rotated, it will drive the circular ring 22 to rotate synchronously through the support block 25 and the connecting rod 23. The circular ring 22 drives the circular block 21 to move, and the circular block 21 slides inside the sliding channel 20, using the connecting plate 19 to adjust the inclination angle of the diversion strip 18, and the diversion strip 18 remains attached to the inner wall of the conical section 501, thereby adjusting the spiral effect formed by the high-speed fluid. For example, when the fluid flow rate is low and easy to mix, without an 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 circular ring 22, and the connecting rod 23 are attached close to the inner wall of the nozzle 5, occupying less space inside the nozzle 5 and reducing the influence on the high-speed fluid.

[0064] In addition, a rubber pad or the like is provided at the end of the threaded sleeve 26 to prevent gas leakage. Moreover, the friction coefficient of the threaded structure between the threaded sleeve 26 and the cylindrical section 502 is appropriate, so that the threaded sleeve 26 will not rotate randomly. An automatic driving mechanism including a motor or the like can also 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 specific usage conditions.

Claims

1. A compact full-power coverage ejector structure, comprising a mixing chamber (1) and a delivery chamber (2) connected to each other, characterized in that: A nozzle (5) for conveying high-speed fluid is provided at one end of the mixing chamber (1) away from the conveying chamber (2), and a secondary hydrogen gas inlet (4) for conveying low-speed fluid is provided on the side wall of the mixing chamber (1); The nozzle (5) comprises 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 disposed inside the delivery cavity (2), and a needle valve (9) that cooperates with the tapered section (501) is fixedly connected to the partition plate (7); In the hydrogen circulation system of a hydrogen fuel cell, when a high-speed fluid passes through a conical section (501), it is accelerated due to a sudden decrease in the cross-sectional area of ​​the flow channel, and acts on a needle valve (9), pushing the needle valve (9) and the partition (7) to be displaced 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 flow inlet (4) are layered and intersected at the partition (7). Due to the shear effect of the high-speed fluid, a vortex is formed at the edge of the partition (7), and the low-speed fluids on both sides are entrained and diverted. The mixed fluid after diversion enters the delivery cavity (2).

2. A compact full-power coverage ejector structure according to claim 1, characterized in that: A slide groove (6) is provided on the inner wall of the conveying cavity (2), the partition plate (7) is slidably arranged inside the slide groove (6), and a spring (8) is arranged inside the slide groove (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 provided for sliding movement outside the conveying cavity (2), and the outer sliding ring (12) and the inner sliding ring (11) move synchronously using a magnetic component.

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

6. A compact full-power coverage ejector structure according to claim 5, characterized in that: The wall thickness at the inner circle 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 guide 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 guide strips (18) are provided.

9. A compact full-power coverage ejector structure according to claim 7, characterized in that: The included angle between the guide 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: The nozzle (5) is provided with a control component for adjusting the inclination angle of the guide strip (18), and the control component comprises a circular ring (22).

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