Ejector and hydrogen system with same

Abstract

The utility model provides an ejector and a hydrogen system with the same. The ejector comprises an ejection assembly and a pressure adjusting device, the ejection assembly comprises a shell and a pressure adjusting device, the shell is provided with a first air inlet, a second air inlet, a first cavity, a second cavity, a communicating opening and an exhaust opening, the first air inlet is used for introducing primary flow hydrogen, and the second air inlet is used for introducing secondary flow hydrogen; the first cavity is communicated with the second cavity through the communication port; at least part of the pressure adjusting device is movably arranged at the communicating port so as to shield or avoid the communicating port, and then the gas flow or flow speed at the communicating port is adjusted; the pressure release valve is arranged at the exhaust port, and the exhaust port is communicated with the hydrogen inlet of the galvanic pile structure; and when the air pressure at the exhaust port is greater than or equal to a preset air pressure value, the pressure release valve is opened. According to the utility model, the problem that the ejection range of the ejector in the prior art cannot cover all working conditions required by a galvanic pile structure is solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cell engines, in particular to an ejector and a hydrogen system having the same. Background Art

[0002] At present, the ejector of the fuel cell engine can reintroduce the hydrogen that has not participated in the reaction into the stack structure, so as to improve the utilization rate of hydrogen and optimize the battery's water and heat management capabilities.

[0003] However, in the existing technology, it is difficult for the ejector to cover all the working conditions required by the fuel cell stack structure, which not only affects the versatility of the ejector, but also affects the working efficiency of the hydrogen system. Utility Model Content

[0004] The main purpose of the present invention is to provide an ejector and a hydrogen system having the same, so as to solve the problem in the prior art that the ejection range of the ejector cannot cover all working conditions required by the fuel cell structure.

[0005] In order to achieve the above-mentioned purpose, according to one aspect of the present invention, an ejector is provided, comprising: an ejector assembly, the ejector assembly comprising a shell and a pressure adjusting device, the shell having a first air inlet, a second air inlet, a first cavity, a second cavity, a connecting port and an exhaust port, the first air inlet being used to introduce a primary flow of hydrogen, the second air inlet being used to introduce a secondary flow of hydrogen, the first air inlet being connected to the first cavity, the second air inlet being connected to the second cavity, and the second cavity being connected to the exhaust port; the first cavity being connected to the second cavity through the connecting port; at least part of the pressure adjusting device being movably arranged at the connecting port to block or avoid at least part of the connecting port, thereby adjusting the gas flow rate or flow rate at the connecting port; a pressure relief valve being arranged at the exhaust port; wherein the exhaust port is connected to the hydrogen inlet of the fuel cell stack structure, and when the air pressure at the exhaust port is greater than or equal to a preset air pressure value, the pressure relief valve is opened to relieve pressure.

[0006] Furthermore, there are two communicating ports, including a first communicating port and a second communicating port, at least part of the pressure regulating device is movably arranged at the first communicating port, and the ejection assembly also includes: a bypass valve, the valve plate of the bypass valve is movably arranged at the second communicating port.

[0007] Furthermore, the second cavity has a collecting cavity connected to the exhaust port, and a first flow channel and a second flow channel are provided in the second cavity. The first connecting port is connected to the collecting cavity through the first flow channel, and the second connecting port is connected to the collecting cavity through the second flow channel; wherein, the second air inlet is connected to the first flow channel.

[0008] Furthermore, the ejector further includes: a switch valve, a valve plate of the switch valve can be movably arranged at the first air inlet to adjust the intake flow rate or intake flow velocity at the first air inlet.

[0009] Furthermore, along the flow direction of the gas in the first flow channel, the passing area of ​​the first flow channel first decreases and then increases; and / or, there is also a third flow channel in the shell, the third flow channel is connected to the second air inlet, and the flow direction of the gas in the third flow channel is set at an angle to the flow direction of the gas in the first flow channel; wherein, part of the flow channel wall of the first flow channel arranged toward the third flow channel has a recess.

[0010] Furthermore, the pressure regulating device is a pressure regulating valve, and the valve plate of the pressure regulating valve is movably arranged at the first connecting port; wherein the valve plate of the pressure regulating valve is arranged opposite to the valve plate of the bypass valve.

[0011] Furthermore, the ejection assembly also includes: a one-way valve, arranged at the second air inlet; a connector, arranged on the shell and located at the second air inlet, and the connector is used to connect to the gas-liquid separator of the fuel cell engine.

[0012] Furthermore, there is one ejection assembly; or, there are multiple ejection assemblies, and at least two ejection assemblies are arranged in parallel with each other.

[0013] According to another aspect of the present invention, a hydrogen system is provided, including an ejector, a gas-liquid separator, a circulation pump and a fuel cell stack structure, wherein the inlet of the gas-liquid separator is connected to the hydrogen outlet of the fuel cell stack structure, the return air port of the gas-liquid separator is connected to both the circulation pump and the second air inlet of the ejector, and the exhaust port of the circulation pump and the exhaust port of the ejector are both connected to the hydrogen inlet of the fuel cell stack structure; wherein the ejector is the above-mentioned ejector.

[0014] Furthermore, the hydrogen system also includes: a first pipeline connected to the drain port of the gas-liquid separator; a second pipeline connected to the exhaust port of the gas-liquid separator; a first heater arranged on the first pipeline; a second heater arranged on the second pipeline; and / or a drain valve arranged on the first pipeline.

[0015] Applying the technical solution of the present invention, the ejector includes an ejector assembly and a pressure relief valve. The ejector assembly includes a housing and a pressure adjustment device. The housing has a first air inlet, a second air inlet, a first cavity, a second cavity, a connecting port, and an exhaust port. The first air inlet is used to introduce a primary flow of hydrogen, and the second air inlet is used to introduce a secondary flow of hydrogen. The first air inlet is connected to the first cavity, the second air inlet is connected to the second cavity, and the second cavity is connected to the exhaust port. The first cavity is connected to the second cavity through the connecting port. The pressure relief valve is arranged at the exhaust port. The exhaust port is connected to the hydrogen inlet of the fuel cell structure. When the air pressure at the exhaust port is greater than or equal to the preset air pressure value, the pressure relief valve opens to relieve pressure. In this way, by movably positioning at least a portion of the pressure regulating device at the communication port to block or avoid at least a portion of the communication port, the gas flow rate or flow rate at the communication port can be adjusted, thereby adjusting the gas flow rate or flow rate entering the second chamber and the gas flow rate or flow rate discharged from the exhaust port. This allows the ejector to cover a wide range of ejection, resolving the problem in the prior art that the ejection range of the ejector cannot cover all operating conditions required by the fuel cell stack structure. Furthermore, the pressure regulating device and the pressure relief valve are both integrated into the housing, thereby reducing the overall volume occupied by the ejector and improving the ejector's level of integration. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] The drawings constituting part of this application are provided to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are provided to explain the present invention and do not constitute an improper limitation of the present invention. In the drawings:

[0017] Figure 1 Shows a front view of an embodiment of an ejector according to the present utility model;

[0018] Figure 2 Shown Figure 1 AA sectional view of the ejector;

[0019] Figure 3 Shown Figure 1 A side view of the ejector in FIG.

[0020] Figure 4 Shown Figure 3 BB cross-sectional view of the ejector;

[0021] Figure 5 A structural schematic diagram of an embodiment of a hydrogen system according to the present utility model is shown.

[0022] The above drawings include the following reference numerals:

[0023] 10. Housing; 11. First air inlet; 12. Second air inlet; 13. First cavity; 14. Second cavity; 141. Collecting cavity; 142. First flow channel; 1421. Recess; 143. Second flow channel; 15. Exhaust port; 16. First connecting port; 17. Second connecting port; 18. Third flow channel; 20. Pressure regulating device; 21. Pressure regulating valve plate; 40. Pressure relief valve; 50. Stack structure; 51. Hydrogen inlet Inlet; 52, hydrogen outlet; 60, on-off valve; 61, on-off valve plate; 70, one-way valve; 80, connector; 90, gas-liquid separator; 100, circulation pump; 110, first pipeline; 120, second pipeline; 130, first heater; 140, second heater; 150, drain valve; 160, bypass valve; 161, bypass valve plate; 170, filter structure; 180, pressure sensor; 200, ejector. DETAILED DESCRIPTION

[0024] It should be noted that, in the absence of conflict, the embodiments and features of the embodiments in this application can be combined with each other. The present invention will be described in detail below with reference to the accompanying drawings and in combination with the embodiments.

[0025] It should be noted that, unless otherwise specified, all technical and scientific terms used in this application have the same meaning as commonly understood by ordinary technicians in the technical field to which this application belongs.

[0026] In the present invention, unless otherwise specified, directional words such as "up" and "down" are generally used with respect to the directions shown in the drawings, or with respect to the vertical, perpendicular or gravity direction; similarly, for ease of understanding and description, "left" and "right" are generally used with respect to the left and right shown in the drawings; "inside" and "outside" refer to the inside and outside relative to the outline of each component itself, but the above directional words are not used to limit the present invention.

[0027] In order to solve the problem in the prior art that the ejection range of the ejector cannot cover all working conditions required by the fuel cell structure, the present application provides an ejector and a hydrogen system having the same.

[0028] like Figures 1 to 5As shown, the ejector includes an ejector assembly and a pressure relief valve 40. The ejector assembly includes a shell 10 and a pressure regulating device 20. The shell 10 has a first air inlet 11, a second air inlet 12, a first cavity 13, a second cavity 14, a connecting port and an exhaust port 15. The first air inlet 11 is used to introduce a primary flow of hydrogen, and the second air inlet 12 is used to introduce a secondary flow of hydrogen. The first air inlet 11 is connected to the first cavity 13, the second air inlet 12 is connected to the second cavity 14, and the second cavity 14 is connected to the exhaust port 15. The first cavity 13 is connected to the second cavity 14 through the connecting port. At least part of the pressure regulating device 20 is movably arranged at the connecting port to block or avoid at least part of the connecting port, thereby adjusting the gas flow rate or flow rate at the connecting port. The pressure relief valve 40 is arranged at the exhaust port 15. The exhaust port 15 is connected to the hydrogen inlet 51 of the fuel cell stack structure 50 . When the gas pressure at the exhaust port 15 is greater than or equal to a preset pressure value, the pressure relief valve 40 opens to relieve pressure.

[0029] The technical solution of this embodiment movably positions at least a portion of the pressure regulating device 20 at the communication port to block or avoid at least a portion of the communication port, thereby adjusting the gas flow rate or velocity at the communication port, thereby adjusting the gas flow rate or velocity entering the second cavity 14 and the gas flow rate or velocity discharged from the exhaust port 15. This enables the ejector to cover a wide range of ejection, resolving the problem in the prior art that the ejection range of ejectors cannot cover all operating conditions required by the fuel cell stack structure. Furthermore, the pressure regulating device 20 and the pressure relief valve 40 are both integrated into the housing 10, thereby reducing the overall footprint of the ejector and improving the ejector's integration.

[0030] Optionally, the primary flow hydrogen gas entering the first cavity 13 may be heated by a heating device.

[0031] Optionally, a pressure sensor 180 is provided in the first cavity 13 , and the pressure sensor 180 is used to detect the pressure value in the first cavity 13 .

[0032] Optionally, the ejector further includes a control module, which is electrically connected to the pressure sensor 180 and the pressure adjustment device 20 to control the gas flow rate or flow velocity at the communication port according to the pressure detection value of the pressure sensor 180.

[0033] In this embodiment, the pressure relief valve 40 can improve the overall safety of the ejector. The preset pressure value is 2.3 barg. When the pressure is greater than 2.3 barg, the pressure relief valve 40 opens to release the hydrogen.

[0034] like Figure 2As shown, there are two communication ports, including a first communication port 16 and a second communication port 17. At least a portion of the pressure regulating device 20 is movably disposed at the first communication port 16. The ejector assembly also includes a bypass valve 160. The valve plate of the bypass valve 160 is movably disposed at the second communication port 17. In this way, by adjusting the opening angle of the valve plate of the bypass valve 160, the flow rate of the primary hydrogen gas to be bypassed entering the second chamber 14 is controlled, thereby adjusting the flow rate or flow velocity of the gas discharged from the exhaust port 15, so that the ejector can cover a wide ejection range.

[0035] Specifically, the bypass valve plate 161 of the bypass valve 160 is movably disposed at the second communication port 17. The primary hydrogen gas entering the first cavity 13 via the first gas inlet 11 can enter the second cavity 14 via the first communication port 16 and the second communication port 17. By adjusting the gas flow rate or flow rate at the first communication port 16 and the second communication port 17, the ejection range of the ejector can be adjusted to meet different operating conditions.

[0036] Optionally, the control module is electrically connected to the bypass valve 160 to control the flow rate of the primary hydrogen gas to be bypassed into the second chamber 14 through the bypass valve 160 .

[0037] like Figure 4 As shown, the second cavity 14 has a collecting cavity 141 connected to the exhaust port 15, and a first flow channel 142 and a second flow channel 143 are provided in the second cavity 14. The first connecting port 16 is connected to the collecting cavity 141 through the first flow channel 142, and the second connecting port 17 is connected to the collecting cavity 141 through the second flow channel 143. Among them, the second air inlet 12 is connected to the first flow channel 142. In this way, the primary flow hydrogen entering the collecting cavity 141 through the first connecting port 16 and the first flow channel 142, the primary flow hydrogen entering the collecting cavity 141 through the second connecting port 17 and the second flow channel 143, and the secondary flow hydrogen entering through the second air inlet 12 merge in the collecting cavity 141, and then flow out from the exhaust port 15 to the hydrogen inlet 51 of the stack structure 50.

[0038] like Figures 1 to 3 As shown, the ejector further includes an on-off valve 60. The valve plate of the on-off valve 60 is movably disposed at the first air inlet 11 to adjust the air flow rate or air velocity at the first air inlet 11. Thus, when the fuel cell engine is shut down, the on-off valve 60 can be used to control the ejector to a standby state, preventing gas from entering the ejector through the first air inlet 11. After starting the fuel cell engine, the valve plate of the on-off valve 60 is opened to ensure that primary hydrogen can flow into the first air inlet 11.

[0039] Specifically, the switch valve plate 61 is movably disposed at the first air inlet 11 to adjust the intake air flow rate or intake air flow velocity at the first air inlet 11 .

[0040] Optionally, the control module is electrically connected to the switch valve 60 to control the intake air flow rate or intake air flow velocity at the first air inlet 11 through the switch valve 60 .

[0041] Optionally, the ejector further includes a filtering structure 170 , which is disposed at the first air inlet 11 to filter impurities in the primary flow hydrogen entering the first air inlet 11 .

[0042] Optionally, the filter structure 170 is a filter mesh.

[0043] Optionally, along the flow direction of the gas in the first flow channel 142, the passing area of ​​the first flow channel 142 first decreases and then increases; and / or, the shell 10 further has a third flow channel 18, the third flow channel 18 is connected to the second air inlet 12, and the flow direction of the gas in the third flow channel 18 is arranged at an angle to the flow direction of the gas in the first flow channel 142. Among them, the part of the flow channel wall of the first flow channel 142 that is arranged toward the third flow channel 18 has a recess 1421. In this way, the above-mentioned setting of the first flow channel 142 can reduce the resistance encountered during the flow of hydrogen and improve the smoothness of the flow of hydrogen. The above-mentioned setting of the recess 1421 can avoid gas turbulence at the connection point between the third flow channel 18 and the first flow channel 142, which affects the normal flow of hydrogen, and further improves the smoothness of the gas flow in the ejector.

[0044] Optionally, the first flow channel 142 and the third flow channel 18 are arranged perpendicular to each other.

[0045] In this embodiment, the flow area of ​​the first flow channel 142 decreases and then increases along the flow direction of the gas in the first flow channel 142. The housing 10 also includes a third flow channel 18, which is connected to the second air inlet 12. The flow direction of the gas in the third flow channel 18 is arranged at an angle to the flow direction of the gas in the first flow channel 142.

[0046] like Figure 2 As shown, the pressure regulating device 20 is a pressure regulating valve, the valve plate of which is movably disposed at the first communication port 16. The valve plate of the pressure regulating valve is disposed opposite the valve plate of the bypass valve 160. This arrangement, on the one hand, simplifies the structure of the pressure regulating device 20, making it easier to manufacture and implement, thereby reducing the cost and difficulty of manufacturing the pressure regulating device 20. It also makes the structural layout within the housing 10 more compact, improving the internal space utilization of the housing 10.

[0047] In this embodiment, the pressure regulating valve plate 21 of the pressure regulating valve is movably disposed at the first communication port 16 .

[0048] like Figure 4 As shown, the ejector assembly also includes a one-way valve 70 and a connector 80. The one-way valve 70 is disposed at the second air inlet 12, and the connector 80 is disposed on the housing 10 and located at the second air inlet 12. The connector 80 is used to connect to the gas-liquid separator 90 of the fuel cell engine. Thus, the configuration of the one-way valve 70 prevents hydrogen backflow from occurring at the second air inlet 12, which could affect the normal operation of the ejector, thereby improving the operational reliability of the ejector. Furthermore, the configuration of the connector 80 makes assembly and disassembly of the ejector and the gas-liquid separator 90 easier and simpler, reducing the difficulty of assembly and disassembly.

[0049] Alternatively, there is one ejection assembly; or, there are multiple ejection assemblies, with at least two ejection assemblies being arranged in parallel. In this way, the above arrangement makes the number of ejection assemblies more flexible to meet different usage conditions.

[0050] like Figure 5 As shown, the present application also provides a hydrogen system, including an ejector 200, a gas-liquid separator 90, a circulation pump 100 and a fuel cell stack structure 50, wherein the inlet of the gas-liquid separator 90 is connected to the hydrogen outlet 52 of the fuel cell stack structure 50, the return air port of the gas-liquid separator 90 is connected to both the circulation pump 100 and the second air inlet 12 of the ejector 200, and the exhaust port of the circulation pump 100 and the exhaust port 15 of the ejector 200 are both connected to the hydrogen inlet 51 of the fuel cell stack structure 50. Among them, the ejector 200 is the above-mentioned ejector.

[0051] In this embodiment, the hydrogen flow direction within the hydrogen system is as follows: primary hydrogen flows from the hydrogen storage system into the heating device. The heated primary hydrogen flows into the ejector 200, where it is pressed into the hydrogen inlet 51 of the right manifold through the ejector 200 and then into the fuel cell stack structure 50. The reacted secondary hydrogen flows out of the left manifold hydrogen outlet 52 and into the gas-liquid separator 90. After the separation, the secondary hydrogen flows out of the hydrogen return channel and simultaneously enters the ejector 200 and the circulation pump 100. The secondary hydrogen entering the ejector 200 merges with the newly entered primary hydrogen. The secondary hydrogen, after circulation through the circulation pump 100, merges again with the hydrogen from the ejector 200 and flows into the hydrogen inlet 51 of the right manifold, completing one hydrogen cycle. The pressure relief valve 40 on the ejector 200 is opened and discharged directly into the atmosphere.

[0052] like Figure 5As shown, the hydrogen system further includes a first pipeline 110, a second pipeline 120, a first heater 130, and a second heater 140. The first pipeline 110 is connected to the liquid discharge port of the gas-liquid separator 90, and the second pipeline 120 is connected to the exhaust port of the gas-liquid separator 90. The first heater 130 is disposed on the first pipeline 110, and the second heater 140 is disposed on the second pipeline 120; and / or, the hydrogen system further includes a drain valve 150, which is disposed on the first pipeline 110. In this way, the reacted secondary hydrogen flow enters the gas-liquid separator 90, and the water and nitrogen discharged through the drain valve 150 and the nitrogen discharge valve merge and flow into the tail drain.

[0053] Specifically, the ejector 200 is used in the fuel cell engine's commonly used power range (14-67% of total power), while the ejector bypass and circulation pump 100 are used in conjunction in the remaining power ranges. The filter structure 170 filters impurities from the primary hydrogen flow. The angle of the valve plate of the on-off valve 60 controls the flow rate of the primary hydrogen flow, which enters the first chamber 13. The opening angle of the valve plate of the pressure regulating valve reduces the pressure of the primary hydrogen flow to be ejected to an appropriate range, and then enters the second chamber 14. The opening angle of the valve plate of the bypass valve 160 controls the flow rate of the bypassed primary hydrogen flow into the second flow channel 143. The secondary hydrogen flow flows through the connector 80 and the one-way valve 70 into the third flow channel 18. The primary hydrogen flow in first flow channel 142 merges with the secondary hydrogen flow in third flow channel 18 and the primary hydrogen flow in second flow channel 143 to flow into collecting chamber 141. The hydrogen then flows out of exhaust port 15. When the pressure exceeds 2.3 barg, pressure relief valve 40 opens to release the hydrogen. Thus, the pressure at exhaust port 15 is controlled by controlling the opening angle of each valve plate and the speed of circulating pump 100.

[0054] In this embodiment, the above-mentioned direction of the one-way valve 70 is not conducive to ice formation. The one-way valve 70 with heating function ensures that the secondary flow hydrogen flowing back from the gas-liquid separator 90 has a single flow direction and does not freeze at low temperatures. By controlling the opening and closing of multiple valve plates, the hydrogen flow rate and component ratio are adjusted to meet the power requirements.

[0055] In this embodiment, the gas-liquid separator 90 includes a nitrogen exhaust passage and a nitrogen exhaust valve, a water exhaust passage and a water exhaust valve, and a hydrogen return passage.

[0056] In this embodiment, the ejector 200 and the circulating pump 100 are arranged in parallel to compensate for insufficient ejection due to low power. The hydrogen system's integrated modular design offers a compact structure and high integration, allowing it to be assembled as a single module during complete system assembly, improving assembly efficiency.

[0057] From the above description, it can be seen that the above embodiments of the present invention achieve the following technical effects:

[0058] The ejector includes an ejector assembly and a pressure relief valve. The ejector assembly includes a housing and a pressure adjustment device. The housing has a first air inlet, a second air inlet, a first cavity, a second cavity, a connecting port, and an exhaust port. The first air inlet is used to introduce primary hydrogen flow, and the second air inlet is used to introduce secondary hydrogen flow. The first air inlet is connected to the first cavity, the second air inlet is connected to the second cavity, and the second cavity is connected to the exhaust port. The first cavity is connected to the second cavity through the connecting port. The pressure relief valve is set at the exhaust port; wherein the exhaust port is connected to the hydrogen inlet of the fuel cell structure. When the air pressure at the exhaust port is greater than or equal to the preset pressure value, the pressure relief valve opens to relieve pressure. In this way, by movably positioning at least a portion of the pressure regulating device at the communication port to block or avoid at least a portion of the communication port, the gas flow rate or flow rate at the communication port can be adjusted, thereby adjusting the gas flow rate or flow rate entering the second chamber and the gas flow rate or flow rate discharged from the exhaust port. This allows the ejector to cover a wide range of ejection, resolving the problem in the prior art that the ejection range of the ejector cannot cover all operating conditions required by the fuel cell stack structure. Furthermore, the pressure regulating device and the pressure relief valve are both integrated into the housing, thereby reducing the overall volume occupied by the ejector and improving the ejector's level of integration.

[0059] Obviously, the embodiments described above are only part of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work should fall within the scope of protection of the present invention.

[0060] It should be noted that the terms used herein are only for describing specific embodiments and are not intended to limit the exemplary embodiments according to the present application. As used herein, unless the context clearly indicates otherwise, the singular form is also intended to include the plural form. In addition, it should be understood that when the terms "comprise" and / or "include" are used in this specification, they indicate the presence of features, steps, tasks, devices, components and / or combinations thereof.

[0061] It should be noted that the terms "first," "second," and the like in the specification and claims of this application and the accompanying drawings are used to distinguish similar objects and are not necessarily used to describe a specific order or precedence. It should be understood that the terms used in this manner are interchangeable where appropriate, so that the embodiments of the present application described herein can be implemented in an order other than that illustrated or described herein.

[0062] The above description is merely a preferred embodiment of the present invention and is not intended to limit the present invention. Those skilled in the art will readily appreciate that the present invention is susceptible to various modifications and variations. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present invention shall be included within the scope of protection of the present invention.

Claims

1. An ejector, characterized in that: include: An ejection assembly, comprising a shell (10) and a pressure regulating device (20), wherein the shell (10) has a first air inlet (11), a second air inlet (12), a first cavity (13), a second cavity (14), a connecting port, and an exhaust port (15), wherein the first air inlet (11) is used for introducing a primary flow of hydrogen gas, and the second air inlet (12) is used for introducing a secondary flow of hydrogen gas, the first air inlet (11) is in communication with the first cavity (13), the second air inlet (12) is in communication with the second cavity (14), and the second cavity (14) is in communication with the exhaust port (15); the first cavity (13) is in communication with the second cavity (14) through the connecting port; at least a portion of the pressure regulating device (20) is movably arranged at the connecting port to shield or avoid at least a portion of the connecting port, thereby adjusting the gas flow rate or flow rate at the connecting port; A pressure relief valve (40) is provided at the exhaust port (15); the exhaust port (15) is in communication with a hydrogen inlet (51) of a fuel cell stack structure (50); when the air pressure at the exhaust port (15) is greater than or equal to a preset air pressure value, the pressure relief valve (40) opens to relieve pressure.

2. The ejector according to claim 1, characterized in that There are two communication ports, including a first communication port (16) and a second communication port (17). At least a portion of the pressure adjustment device (20) is movably arranged at the first communication port (16). The ejection assembly further includes: A bypass valve (160), wherein the valve plate of the bypass valve (160) is movably arranged at the second communication port (17).

3. The ejector according to claim 2, characterized in that The second cavity (14) has a collecting cavity (141) connected to the exhaust port (15); a first flow channel (142) and a second flow channel (143) are provided in the second cavity (14); the first communication port (16) is connected to the collecting cavity (141) through the first flow channel (142); the second communication port (17) is connected to the collecting cavity (141) through the second flow channel (143); wherein the second air inlet (12) is connected to the first flow channel (142).

4. The ejector according to claim 1, characterized in that The ejector further comprises: A switch valve (60), wherein a valve plate of the switch valve (60) is movably arranged at the first air inlet (11) to adjust the air flow rate or air velocity at the first air inlet (11).

5. The ejector according to claim 3, characterized in that Along the flow direction of the gas in the first flow channel (142), the passing area of ​​the first flow channel (142) first decreases and then increases; and / or, the shell (10) further comprises a third flow channel (18), the third flow channel (18) is connected to the second air inlet (12), and the flow direction of the gas in the third flow channel (18) is arranged at an angle to the flow direction of the gas in the first flow channel (142); wherein a portion of the flow channel wall of the first flow channel (142) arranged toward the third flow channel (18) comprises a recess (1421).

6. The ejector according to claim 2, characterized in that The pressure regulating device (20) is a pressure regulating valve, and the valve plate of the pressure regulating valve is movably arranged at the first communication port (16); wherein the valve plate of the pressure regulating valve is arranged opposite to the valve plate of the bypass valve (160).

7. The ejector according to claim 1, characterized in that The ejection assembly further comprises: a one-way valve (70) disposed at the second air inlet (12); A connector (80) is provided on the housing (10) and located at the second air inlet (12); the connector (80) is used to connect to a gas-liquid separator (90) of a fuel cell engine.

8. The ejector according to claim 1, characterized in that There is one ejection assembly; or, there are multiple ejection assemblies, and at least two ejection assemblies are arranged in parallel with each other.

9. A hydrogen system, characterized in that: The invention comprises an ejector (200), a gas-liquid separator (90), a circulation pump (100) and a fuel cell stack structure (50), wherein the inlet of the gas-liquid separator (90) is connected to the hydrogen outlet (52) of the fuel cell stack structure (50), the return air port of the gas-liquid separator (90) is connected to the circulation pump (100) and the second air inlet (12) of the ejector (200), and the exhaust port of the circulation pump (100) and the exhaust port (15) of the ejector (200) are both connected to the hydrogen inlet (51) of the fuel cell stack structure (50); wherein the ejector (200) is the ejector according to any one of claims 1 to 8.

10. The hydrogen system according to claim 9, characterized in that: The hydrogen system further comprises: a first pipeline (110) communicating with a liquid discharge port of the gas-liquid separator (90); a second pipeline (120) communicating with the exhaust port of the gas-liquid separator (90); a first heater (130), disposed on the first pipeline (110); a second heater (140), disposed on the second pipeline (120); and / or, A drain valve (150) is provided on the first pipeline (110).

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