Integrated ejector device and fuel cell system

Abstract

This application relates to an integrated ejector device and a fuel cell system. The device includes an ejector body and a left manifold, a right manifold, and a hydrogen circulation pump integrated on the ejector body. The ejector body has an ejection cavity, and an ejection inlet, an ejection outlet, and a return inlet communicating with the ejection cavity. Both the left and right manifolds have hydrogen channels, air channels, and coolant channels. The left manifold is located on the ejection outlet side of the ejector body, and the right manifold is located on the side of the ejector body opposite to the left manifold. Its hydrogen channel is used to connect to the hydrogen outlet of the fuel cell stack to introduce return hydrogen. The right manifold also has a gas-liquid separation chamber and a water tank through which the hydrogen channel passes. The hydrogen circulation pump is located on the return inlet side of the ejector body. The hydrogen inlet of the hydrogen circulation pump is connected to the outlet of the hydrogen channel of the right manifold, and the hydrogen outlet of the hydrogen circulation pump is connected to the return inlet of the ejector body. This application has a simple structure and complete ejection function.

Description

Technical Field

[0001] This application relates to the field of fuel cell hydrogen supply system technology, and more specifically, to an integrated ejector device and a fuel cell system. Background Technology

[0002] The hydrogen supply system, or hydrogen module, of a fuel cell involves feeding high-pressure hydrogen from the hydrogen storage system through a series of components such as a heat exchanger and hydrogen injection valves before it is introduced into the fuel cell stack. This ensures a smooth hydrogen supply and allows the fuel cell system to stably output electrical energy. However, in current mainstream fuel cell systems, the hydrogen module either lacks an ejector or simply uses isolated ejector structures. Consequently, the hydrogen supply capability is overly simplistic, the integration of components is low, the number of components is large, the structure is loose, and the layout is wide, leading to complex installation and maintenance, and impacting production efficiency. Furthermore, when manufacturers select and install numerous separate components, the lack of integration can result in incomplete hydrogen supply functionality, affecting the power generation output of the fuel cell system. Summary of the Invention

[0003] This application provides an integrated ejector device and a fuel cell system to solve the problems in the prior art where the hydrogen module of the fuel cell only uses discrete components, resulting in low integration, a large number of components, loose structure, and large layout, leading to complex installation and maintenance and incomplete functions.

[0004] An integrated ejector device according to this application includes: an ejector body, and a left manifold, a right manifold, and a hydrogen circulation pump integrated on the ejector body;

[0005] The ejector body is provided with an ejection cavity, as well as an ejection inlet, an ejection outlet and a return inlet that connect to the ejection cavity;

[0006] The left and right busbars are used to connect the fuel cell stack and the integrated ejector device. Both the left and right busbars are equipped with hydrogen passages, air passages and coolant passages.

[0007] The left manifold is located on the ejector outlet side of the ejector body, and its hydrogen channel is connected to the ejector outlet to supply hydrogen to the hydrogen inlet of the fuel cell stack. The right manifold is located on the side of the ejector body opposite to the left manifold, and its hydrogen channel is used to connect to the hydrogen outlet of the fuel cell stack to introduce return hydrogen. The right manifold is also provided with a gas-liquid separation chamber and a water tank. The hydrogen channel of the right manifold passes through the gas-liquid separation chamber and the water tank.

[0008] The hydrogen circulation pump is located on the return inlet side of the ejector body. The hydrogen inlet of the hydrogen circulation pump is connected to the outlet of the hydrogen channel of the right manifold, and the hydrogen outlet of the hydrogen circulation pump is connected to the return inlet of the ejector body.

[0009] In some embodiments, an ejector nozzle is provided within the ejector body and is inserted into an ejector cavity. The ejector nozzle includes a sealing section, a fitting section, a reflux section, and a nozzle section arranged sequentially. A sealing structure is provided between the sealing section and the ejector cavity. The outer diameter of the fitting section is consistent with the inner diameter of the ejector cavity, and the two are fitted together. The reflux section narrows in a stepped manner with the fitting section to form a reflux cavity between the reflux section and the ejector cavity. A reflux inlet is connected and provided at the location of the reflux cavity.

[0010] In some embodiments, a flow control valve is also provided in the ejector body;

[0011] The sealing section of the ejector nozzle has a nozzle groove inside. The valve body of the flow control valve conforms to the nozzle groove, and a sealing structure is provided between the two. The ejector inlet is located on the sealing section and extends through the nozzle groove to the gas inlet of the flow control valve. The gas outlet of the flow control valve is connected to the gas supply pipe of the ejector nozzle.

[0012] In some embodiments, the water tank of the right manifold is located below the gas-liquid separation chamber, and a number of baffles are provided in the gas-liquid separation chamber, with gas channels provided at the opposite ends of adjacent baffles.

[0013] In some embodiments, the hydrogen inlet of the hydrogen channel of the right manifold is located on the back side of the plate, the hydrogen outlet of the hydrogen channel of the right manifold is located on the front side of the plate, and the hydrogen circulation pump is located on the front side of the ejector body to connect to the hydrogen outlet of the hydrogen channel of the right manifold.

[0014] In some embodiments, on the left and right busbars, the connection ports of each hydrogen passage, air passage, and coolant passage to the fuel cell stack are all located on the back side of the corresponding busbar.

[0015] In some embodiments, the integrated ejector device further includes a hydrogen heat exchanger, which is located on the opposite side of the reflux inlet of the ejector body. The outlet of the hydrogen heat exchanger is provided with a protruding structure, and the ejection inlet of the ejector body is provided with a groove structure. The protruding structure is inserted into the groove structure and a sealing structure is provided to achieve a sealed connection.

[0016] In some embodiments, the coolant channel of the right manifold is provided with a coolant outlet branch, the coolant channel of the left manifold is provided with a coolant return branch, the heat medium inlet of the hydrogen heat exchanger is connected to the coolant outlet branch, and the heat medium outlet of the hydrogen heat exchanger is connected to the coolant return branch.

[0017] In some embodiments, the ejector inlet is located on the upper right side of the ejector body, the ejector outlet is located on the left side of the ejector body, and the reflux inlet is located on the lower side of the ejector body.

[0018] According to another aspect of this application, a fuel cell system is provided, which includes a fuel cell stack and the integrated ejector device as described above.

[0019] The technical solution of this application integrates a left manifold, a right manifold, and a hydrogen circulation pump on the basis of the ejector body. The left and right manifolds are used to connect the ejector device to the fuel cell stack. The hydrogen, air, and coolant pipelines on the inlet and outlet sides of the fuel cell stack can be integrated. At the same time, this application integrates a gas-liquid separation chamber and a water tank on the hydrogen channel of the right manifold and connects it to the hydrogen circulation pump. The hydrogen circulation pump is connected to the return inlet of the ejector body, realizing the series connection between the ejector body and the hydrogen circulation pump. The ejector body and the hydrogen circulation pump can withstand different pressure rises, thereby adapting to the different power requirements of the fuel cell system under different operating conditions. This application has a simple structure, high integration, and more complete functions. Attached Figure Description

[0020] The accompanying drawings, which are incorporated in and form part of this specification, illustrate embodiments consistent with this application and, together with the description, serve to explain the principles of this application.

[0021] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, for those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0022] Figure 1 A front structural schematic diagram of an integrated ejector device according to an embodiment of this application is shown;

[0023] Figure 2 This paper shows a schematic cross-sectional view of the ejector body of an integrated ejector device according to an embodiment of the present application.

[0024] Figure 3 A cross-sectional schematic diagram of the right manifold of an integrated ejector device according to an embodiment of this application is shown;

[0025] Figure 4 A schematic diagram of the rear structure of an integrated ejector device according to an embodiment of this application is shown;

[0026] Figure 5 This paper shows a schematic cross-sectional view of the ejector cavity and ejector nozzle of an integrated ejector device according to an embodiment of this application;

[0027] Figure 6 This paper shows a schematic cross-sectional view of the ejector body of an integrated ejector device according to an embodiment of the present application.

[0028] Figure 7A schematic diagram of the hydrogen heat exchanger installation position of an integrated ejector device according to an embodiment of this application is shown;

[0029] Figure 8 A three-dimensional structural schematic diagram of the hydrogen heat exchanger of an integrated ejector device according to an embodiment of this application is shown;

[0030] Figure 9 A schematic cross-sectional view of the hydrogen inlet structure of the hydrogen heat exchanger of an integrated ejector device according to an embodiment of this application is shown.

[0031] Figure 10 A schematic diagram of the sealing structure of an integrated ejector device according to an embodiment of this application is shown;

[0032] The above figures include the following reference numerals:

[0033] 10. Ejector body; 11. Ejector cavity; 111. Ejector inlet; 1111. Groove structure; 112. Ejector outlet; 113. Return inlet; 12. Ejector nozzle; 121. Sealing section; 1211. Nozzle groove; 122. Fitting section; 123. Return section; 124. Nozzle section; 13. Flow control valve; 131. Sealing ring; 20. Left manifold; 21. Left air inlet; 22. Left air outlet; 23. 24. Left coolant inlet; 25. Left coolant outlet; 36. Left hydrogen outlet; 37. Right manifold; 38. Right air inlet; 39. Right air outlet; 30. Right coolant inlet; 31. Right coolant outlet; 32. Right hydrogen inlet; 33. Gas-liquid separation chamber; 34. Baffle; 35. Water tank; 46. Hydrogen circulation pump; 57. Hydrogen heat exchanger; 58. Protruding structure; 59. Water inlet pipe; 50. Water outlet pipe; 51. Hydrogen inlet. Detailed Implementation

[0034] It should be noted that, unless otherwise specified, the embodiments and features described in this application can be combined with each other. This application will now be described in detail with reference to the accompanying drawings and embodiments.

[0035] It should be noted that the following detailed descriptions are illustrative and intended to provide further explanation of this application. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application pertains.

[0036] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways, rotated 90 degrees, or in other orientations, and the spatial relative descriptions used herein will be interpreted accordingly.

[0037] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0038] It should be noted that the terms "first," "second," etc., in the specification, claims, and accompanying drawings of this application are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate so that the embodiments of this application described herein can be implemented, for example, in orders other than those illustrated or described herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion; for example, a process, method, system, product, or apparatus that comprises a series of steps or units is not necessarily limited to those steps or units explicitly listed, but may include other steps or units not explicitly listed or inherent to such processes, methods, products, or apparatus.

[0039] Figures 1 to 10 An embodiment of the integrated ejector device of this application is illustrated schematically.

[0040] like Figures 1 to 10 As shown, this application discloses an integrated ejector device, which includes an ejector body 10, and a left manifold 20, a right manifold 30 and a hydrogen circulation pump 40 integrated on the ejector body 10.

[0041] The ejector body 10 is provided with an ejection cavity 11, and an ejection inlet 111, an ejection outlet 112, and a return inlet 113 communicating with the ejection cavity 11. The ejection inlet 111 is used to receive high-pressure primary hydrogen (i.e., hydrogen from hydrogen storage systems such as storage tanks), and the return inlet 113 is used to receive low-pressure secondary hydrogen (i.e., unreacted hydrogen flowing out of the fuel cell stack that needs to be recycled). The primary hydrogen uses a high flow rate to generate negative pressure to eject the secondary hydrogen. The two streams of hydrogen are mixed to form medium-pressure hydrogen, which is discharged from the ejection outlet 112 to the fuel cell stack for reaction and power generation.

[0042] A left busbar 20 and a right busbar 30 are respectively provided on the left and right sides of the ejector body 10. Both the left busbar 20 and the right busbar 30 are used to connect the fuel cell stack and the integrated ejector device of this application. Both the left busbar 20 and the right busbar 30 are provided with hydrogen passage, air passage and coolant passage to integrate the flow channels of each fluid medium of the fuel cell stack.

[0043] The left manifold 20 is located on the ejector outlet 112 side of the ejector body 10, and its hydrogen passage is connected to the ejector outlet 112 to supply hydrogen to the hydrogen inlet of the fuel cell stack. The right manifold 30 is located on the side of the ejector body 10 opposite to the left manifold 20, and its hydrogen passage is used to connect to the hydrogen outlet of the fuel cell stack to introduce reflux hydrogen. The right manifold 30 is also provided with a gas-liquid separation chamber 36 and a water tank 37. The hydrogen passage of the right manifold 30 passes through the gas-liquid separation chamber 36 and the water tank 37, thereby achieving gas-liquid separation of hydrogen during reflux.

[0044] The hydrogen circulation pump 40 is located on the reflux inlet 113 side of the ejector body 10. The hydrogen inlet of the hydrogen circulation pump 40 is connected to the outlet of the hydrogen channel of the right manifold 30, and the hydrogen outlet of the hydrogen circulation pump 40 is connected to the reflux inlet 113 of the ejector body 10.

[0045] Through the above structural design, this application integrates a left manifold 20, a right manifold 30, and a hydrogen circulation pump 40 on the basis of the ejector body 10. The left and right manifolds 20 and 30 connect the ejector device to the fuel cell stack, and can integrate hydrogen, air, and coolant pipelines on the inlet and outlet sides of the fuel cell stack. Simultaneously, this application integrates a gas-liquid separation chamber 36 and a water tank 37 on the hydrogen channel of the right manifold 30, and connects it to the hydrogen circulation pump 40. This connects the hydrogen circulation pump 40 to the return inlet 113 of the ejector body 10, achieving series connection between the ejector body 10 and the hydrogen circulation pump 40. The ejector body 10 and the hydrogen circulation pump 40 can withstand different pressure rises, thus adapting to the different power requirements of the fuel cell system under different operating conditions. The integrated ejector device of this application has a simple structure, high integration, and more complete functions.

[0046] In this application, the ejector body 10 and the hydrogen circulation pump 40 are connected in series, which can improve the stability of hydrogen supply across the entire power range of the fuel cell system, thereby improving the reaction power generation effect. Specifically, the ejector body 10 adopts a passive ejection method to draw in reflux hydrogen. Its venturi tube-shaped ejection cavity 11 is adapted to the medium-to-high power operating conditions of the fuel cell system. It has the advantages of simple structure, small space occupation, and no parasitic power due to the absence of power-generating components. The hydrogen circulation pump 40, on the other hand, actively pumps in reflux hydrogen by performing power, thereby compensating for the disadvantage of the fixed structure of the ejector body 10, which cannot cover the entire power operating range of the fuel cell stack for ejection. Therefore, in this application, the hydrogen circulation pump 40 and the ejector can withstand different pressure increases. When the fuel cell stack is operating at low power, the hydrogen circulation pump 40 mainly pressurizes the recirculated hydrogen to supply the amount of hydrogen needed for low reactivity. When the fuel cell stack is operating at medium to high power, the ejector body 10 mainly pressurizes the recirculated hydrogen to utilize high-speed, high-flow-rate hydrogen to achieve recirculation and ejection of the recirculated hydrogen, thereby improving the ejection effect of the ejector device when operating within the full power range of the fuel cell stack.

[0047] In some embodiments of this application, such as Figure 5 As shown, an ejector nozzle 12 is disposed within the ejector body 10 and inserted into the ejection cavity 11. The ejector nozzle 12 includes a sealing section 121, a fitting section 122, a reflux section 123, and a nozzle section 124 arranged sequentially. A sealing structure is provided between the sealing section 121 and the ejection cavity 11 to achieve an overall seal between the ejection cavity 11 and the ejector nozzle 12. The outer diameter of the fitting section 122 is consistent with the inner diameter of the ejection cavity 11, and the two are fitted together, thereby improving the stability of the ejector nozzle 12 within the ejection cavity 11, making the structure fixed and less prone to damage, and suppressing the slight displacement of the jet point caused by vibration of the ejector nozzle 12, thus improving jet stability. The reflux section 123 narrows in a stepped manner between the reflux section 123 and the fitting section 122 to form a reflux cavity between the reflux section 123 and the ejection cavity 11, providing ejection space for ejecting refluxed hydrogen gas. The reflux inlet 113 is connected to the reflux chamber so that the reflux hydrogen entering from the hydrogen circulation pump 40 can be smoothly injected into the ejection chamber 11.

[0048] In some embodiments of this application, such as Figure 2 , Figure 6 , Figure 9 and Figure 10As shown, a flow control valve 13 is also provided inside the ejector body 10. A nozzle groove 1211 is provided inside the sealing section 121 of the ejector nozzle 12. The valve body of the flow control valve 13 conforms to the nozzle groove 1211, and a sealing structure is provided between them. The ejector inlet 111 is located on the sealing section 121 and extends through the nozzle groove 1211 to the gas inlet of the flow control valve 13. The gas outlet of the flow control valve 13 is connected to the gas supply pipe of the ejector nozzle 12. This application integrates the flow control valve 13 inside the ejector body 10, which also enables flow control of the ejector, achieving the integration of flow control function and ejection function.

[0049] like Figure 10 As shown, the sealing structure between the flow control valve 13 and the nozzle groove 1211 is a multi-segment sealing ring 131. The sealing ring 131 can be made of rubber or other materials. Corresponding to the sealing ring 131, the flow control valve 13 can be provided with a retaining ring or other fixing structure to fix the sealing ring 131.

[0050] In some embodiments of this application, such as Figure 3 and Figure 4 As shown, the water tank 37 of the right manifold 30 is located below the gas-liquid separation chamber 36. Several vertically arranged baffles 361 are installed inside the gas-liquid separation chamber 36. Gas channels are located at opposite ends of adjacent baffles 361, thereby allowing airflow to... Figure 3 The flow is curved as indicated by the dashed arrow. Due to the reaction, the reflux hydrogen contains a significant amount of water. Baffle 361 obstructs the flow of reflux hydrogen, causing the reaction water in the gas stream to condense upon cooling and collect in water tank 37 for separation and collection.

[0051] In some embodiments of this application, such as Figure 1 , Figure 3 and Figure 4 As shown, the left manifold 20 includes a left air inlet 21, a left air outlet 22, a left coolant inlet 23, a left coolant outlet 24, and a left hydrogen outlet 25. The right manifold 30 includes a right air inlet 31, a right air outlet 32, a right coolant inlet 33, a right coolant outlet 34, and a right hydrogen inlet 35. The hydrogen inlet (i.e., the right hydrogen inlet 35) of the hydrogen passage of the right manifold 30 is located on the back of the plate body, corresponding to... Figure 3 As shown in Figure A, the hydrogen outlet of the hydrogen channel in the right manifold 30 is located on the front of the plate, corresponding to... Figure 3 As shown in Figure B, the hydrogen circulation pump 40 is located on the front of the ejector body 10 to connect to the hydrogen outlet of the hydrogen channel of the right manifold 30. This application places the hydrogen circulation pump 40 on the front of the ejector body 10 and the interface connecting the fuel cell stack hydrogen return pipeline on the back of the plate, which facilitates a scientific component layout, effectively utilizes space, and avoids interference between the fuel cell stack and the hydrogen circulation pump 40.

[0052] In some embodiments of this application, the connection ports of each hydrogen channel, air channel and coolant channel to the fuel cell stack on the left busbar 20 and right busbar 30 are all located on the back of the corresponding busbar, which facilitates the arrangement of tube bundles during installation, achieves a neat and efficient connection with the fuel cell stack, is beneficial to the wiring layout of the fuel cell system, reduces the installation and maintenance difficulty of the fuel cell system, and improves production efficiency.

[0053] In some embodiments of this application, such as Figures 1 to 9 As shown, the integrated ejector device of this application also includes a hydrogen heat exchanger 50, which is located on the opposite side of the return inlet 113 of the ejector body 10. The outlet of the hydrogen heat exchanger 50 is provided with a protruding structure 51 (see...). Figure 8 and Figure 9 As shown, the ejector body 10 has an ejector inlet 111 with a groove structure 1111, a protrusion structure 51 inserted into the groove structure 1111, and a sealing structure to achieve a sealed connection. This embodiment integrates a hydrogen heat exchanger 50 onto the ejector body 10, achieving the heating function of primary hydrogen while centralizing the component layout, solving the problems of numerous separate components, loose distribution, and excessive space occupation. Preferably, a hydrogen inlet 54 is provided at the top of the hydrogen heat exchanger 50 so that primary hydrogen flows downward through the heat exchange channel and enters the ejector body 10, ensuring sufficient heat exchange.

[0054] In some embodiments of this application, the coolant channel of the right manifold 30 is provided with a coolant outlet branch, and the coolant channel of the left manifold 20 is provided with a coolant return branch. The heat medium inlet of the hydrogen heat exchanger 50 is connected to the coolant outlet branch through a water inlet pipe 52, and the heat medium outlet of the hydrogen heat exchanger 50 is connected to the coolant return branch through a water outlet pipe 53, so as to obtain the coolant flowing out of the fuel cell stack for heat exchange. In this application, the hydrogen heat exchanger 50 utilizes the integrated coolant channels of the left manifold 20 and the right manifold 30, shortening the pipe length for introducing the fuel cell stack coolant into the hydrogen heat exchanger 50, realizing simplified flow guidance of the fuel cell stack coolant and efficient waste heat utilization, resulting in higher heat exchange efficiency and energy savings.

[0055] In some embodiments of this application, in the ejector body 10, the ejector inlet 111 is located on the upper right side of the ejector body 10, the ejector outlet 112 is located on the left side of the ejector body 10, and the return inlet 113 is located on the lower side of the ejector body 10. Through the layout of different inlet and outlet directions, it is convenient to separately install the left manifold 20, right manifold 30, hydrogen circulation pump 40, and hydrogen heat exchanger 50 on the ejector body 10, thereby making more reasonable use of space to integrate various components, so that the functions of primary hydrogen addition, heating, flow control and secondary hydrogen addition (including passive ejection and active pumping) can be integrated, improving the function of the ejector device, and at the same time making the introduction and exit pipelines of coolant to hydrogen heat exchanger 50 more streamlined and improving heat exchange efficiency.

[0056] In another aspect, this application also discloses a fuel cell system, which includes a fuel cell stack and an integrated ejector device as described in any of the above embodiments. By combining the integrated ejector device with the fuel cell stack, a high degree of integration between the fuel cell stack inlet / outlet device and the ejector device is achieved, improving the ejection method and enhancing hydrogen supply stability. During operation, the left manifold is connected to the hydrogen outlet of the ejector body, and the hydrogen outlet of the left manifold is connected to the hydrogen inlet of the fuel cell stack. The hydrogen outlet of the fuel cell stack is connected to the hydrogen inlet of the right manifold. The right manifold cavity is designed with a gas-liquid separation chamber and a water tank. Hydrogen from the fuel cell stack passes through the gas-liquid separation chamber, where most of the water is separated and flows into the water tank. The separated hydrogen enters through the hydrogen inlet of the hydrogen circulation pump, undergoes secondary pressurization, and then enters the ejector body. After mixing with primary hydrogen, it enters the fuel cell stack for reaction and power generation.

[0057] In summary, the technical solution of this application sets up a left manifold, a right manifold, and a hydrogen circulation pump on the basis of the ejector body. The left and right manifolds are used to connect the ejector device to the fuel cell stack. The hydrogen, air, and coolant pipelines on the inlet and outlet sides of the fuel cell stack can be integrated. At the same time, this application integrates a gas-liquid separation chamber and a water tank on the hydrogen channel of the right manifold and connects it to the hydrogen circulation pump, so that the hydrogen circulation pump is connected to the return inlet of the ejector body. This realizes the series connection between the ejector body and the hydrogen circulation pump. The ejector body and the hydrogen circulation pump can withstand different pressure rises, thereby adapting to the different power requirements of the fuel cell system under different operating conditions. The structure is simple, highly integrated, and more functional, avoiding the risk of fuel cell stack flooding and reducing hydrogen consumption.

[0058] Some preferred embodiments of this application also integrate a hydrogen heat exchanger and a flow control valve, thereby achieving structural integration of the ejector body, hydrogen circulation pump, hydrogen heat exchanger, and flow control valve. This simplifies the number of components in the hydrogen supply system, overcomes the disadvantages of independently set discrete components having complex structures and occupying large spaces, and simultaneously integrates primary hydrogen addition, heating, flow control, and secondary hydrogen addition (including passive ejection and active pumping) functions, realizing diversified settings for the hydrogen supply system functions and improving the function of the ejector device.

[0059] The above are merely preferred embodiments of this application and are not intended to limit this application. Various modifications and variations can be made to this application by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. An integrated ejector device, characterized in that, include: The ejector body (10), and the left manifold (20), right manifold (30) and hydrogen circulation pump (40) integrated on the ejector body (10); The ejector body (10) is provided with an ejection cavity (11), and an ejection inlet (111), an ejection outlet (112) and a return inlet (113) communicating with the ejection cavity (11); The left busbar (20) and the right busbar (30) are both used to connect the fuel cell stack and the integrated ejector device. The left busbar (20) and the right busbar (30) are both provided with hydrogen passage, air passage and coolant passage. The left manifold (20) is disposed on the ejector outlet (112) side of the ejector body (10), and the hydrogen channel of the left manifold (20) is connected to the ejector outlet (112); the right manifold (30) is disposed on the side of the ejector body (10) opposite to the left manifold (20), and the right manifold (30) is also provided with a gas-liquid separation chamber (36) and a water tank (37), and the hydrogen channel of the right manifold (30) passes through the gas-liquid separation chamber (36) and the water tank (37); The hydrogen circulation pump (40) is located on the reflux inlet (113) side of the ejector body (10). The hydrogen inlet of the hydrogen circulation pump (40) is connected to the outlet of the hydrogen channel of the right manifold (30), and the hydrogen outlet of the hydrogen circulation pump (40) is connected to the reflux inlet (113) of the ejector body (10). The hydrogen inlet of the hydrogen channel of the right manifold (30) is located on the back of the plate body, the hydrogen outlet of the hydrogen channel of the right manifold (30) is located on the front of the plate body, and the hydrogen circulation pump (40) is located on the front of the ejector body (10) to connect to the hydrogen outlet of the hydrogen channel of the right manifold (30). On the left busbar (20) and the right busbar (30), the connection ports of each hydrogen channel, air channel and coolant channel to the fuel cell stack are all located on the back side of the corresponding busbar.

2. The integrated ejector device according to claim 1, characterized in that, The ejector body (10) is provided with an ejector nozzle (12), which is inserted into the ejector cavity (11). The ejector nozzle (12) includes a sealing section (121), a fitting section (122), a reflux section (123), and a nozzle section (124) arranged in sequence. A sealing structure is provided between the sealing section (121) and the ejector cavity (11). The outer diameter of the fitting section (122) is consistent with the inner diameter of the ejector cavity (11), and the two are fitted together. The reflux section (123) narrows in a stepped manner with the fitting section (122) to form a reflux cavity between the reflux section (123) and the ejector cavity (11). The reflux inlet (113) is connected to the reflux cavity.

3. The integrated ejector device according to claim 2, characterized in that, The ejector body (10) is also equipped with a flow control valve (13); The sealing section (121) of the ejector nozzle (12) is provided with a nozzle groove (1211). The valve body of the flow control valve (13) conforms to the nozzle groove (1211) and a sealing structure is provided between them. The ejector inlet (111) is provided on the sealing section (121) and extends through the nozzle groove (1211) to the gas inlet of the flow control valve (13). The gas outlet of the flow control valve (13) is connected to the gas supply pipe of the ejector nozzle (12).

4. The integrated ejector device according to claim 1, characterized in that, The water tank (37) of the right manifold (30) is located below the gas-liquid separation chamber (36). The gas-liquid separation chamber (36) is provided with several baffles (361), and gas channels are provided at the opposite ends of adjacent baffles (361).

5. The integrated ejector device according to claim 1, characterized in that, The integrated ejector device also includes a hydrogen heat exchanger (50), which is located on the opposite side of the reflux inlet (113) of the ejector body (10). The outlet of the hydrogen heat exchanger (50) is provided with a protruding structure (51), and the ejection inlet (111) of the ejector body (10) is provided with a groove structure (1111). The protruding structure (51) is inserted into the groove structure (1111) and a sealing structure is provided to achieve a sealed connection.

6. The integrated ejector device according to claim 5, characterized in that, The right manifold (30) has a coolant outlet branch in its coolant channel, and the left manifold (20) has a coolant return branch in its coolant channel. The heat medium inlet of the hydrogen heat exchanger (50) is connected to the coolant outlet branch, and the heat medium outlet of the hydrogen heat exchanger (50) is connected to the coolant return branch.

7. The integrated ejector device according to claim 1, characterized in that, The ejector inlet (111) is located on the upper right side of the ejector body (10), the ejector outlet (112) is located on the left side of the ejector body (10), and the reflux inlet (113) is located on the lower side of the ejector body (10).

8. A fuel cell system, characterized in that, It includes a fuel cell stack and an integrated ejector device as described in any one of claims 1 to 7.

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