Integrated hydrogen circulating pump cover plate, fuel cell hydrogen integrated supply system and method

Abstract

The invention relates to an integrated hydrogen circulating pump cover plate, a fuel cell hydrogen integrated supply system and a fuel cell hydrogen integrated supply method. The cover plate comprises a cover plate body, the hydrogen circulation module comprises a hydrogen one-way valve module, a hydrogen circulation pump inlet, a hydrogen circulation pump outlet, an ejector backflow gas inlet, an ejector mixing section, an ejector diffusion section, a backflow inlet connector communicated with the hydrogen circulation pump inlet and a backflow outlet connector communicated with the ejector diffusion section which are integrally arranged on the cover plate body; a new hydrogen supply module housing, comprising a new hydrogen inlet connector mounting valve seat, a hydrogen isolation valve mounting valve seat, a hydrogen proportional valve mounting valve seat and a new hydrogen inlet flow channel, wherein the new hydrogen inlet connector mounting valve seat is integrally arranged on a cover plate body and used for mounting a new hydrogen inlet connector; the hydrogen isolation valve mounting valve seat is used for mounting a hydrogen isolation valve; the hydrogen proportional valve mounting valve seat is used for mounting a hydrogen proportional valve; and a new hydrogen inlet nozzle is arranged at the new hydrogen inlet flow channel. The space utilization rate is improved, the energy loss is reduced, and efficient hydrogen circulating supply is realized.

Description

Technical Field

[0001] This invention relates to the field of hydrogen fuel cell technology, and in particular to an integrated hydrogen circulation pump cover, a fuel cell integrated hydrogen supply system and method. Background Technology

[0002] A hydrogen fuel cell system mainly consists of modules such as a hydrogen supply system, an air supply system, a hydrothermal management system, an electronic control system, and a fuel cell stack. The main function of the hydrogen supply system is to guide the incompletely reacted wet hydrogen from the anode outlet of the fuel cell stack and the fresh hydrogen from the high-pressure hydrogen storage tank to the fuel cell stack inlet through components such as hydrogen isolation valves, hydrogen proportioning valves, ejectors, hydrogen circulation pumps, and hydrogen check valves, thereby improving hydrogen utilization efficiency.

[0003] However, in existing hydrogen supply systems, the components are relatively independent with low integration. Pipelines are needed to connect the components, making installation complex, space-consuming, and exacerbating energy loss of hydrogen in the loop, thus reducing hydrogen utilization efficiency. Summary of the Invention

[0004] To address this, the present invention provides an integrated hydrogen circulation pump cover, a fuel cell integrated hydrogen supply system, and a method. The ejector, hydrogen check valve, and Roots-type hydrogen circulation pump cover are integrated into one unit. A new hydrogen inlet connector, hydrogen isolation valve, and hydrogen proportioning valve can be further integrated and installed on the cover, greatly simplifying the piping layout of the hydrogen supply system, improving space utilization, reducing energy loss, and achieving efficient hydrogen circulation supply. Under high system operating conditions, hydrogen can be returned to the ejector through the hydrogen check valve, and the hydrogen circulation pump stops operating, optimizing the operating conditions of the hydrogen pump and extending its service life.

[0005] To solve the above-mentioned technical problems, the present invention provides an integrated hydrogen circulation pump cover plate, comprising: Cover plate body; The hydrogen circulation module includes a hydrogen one-way valve module integrated on the cover plate body, a hydrogen circulation pump inlet, a hydrogen circulation pump outlet, an ejector reflux inlet, an ejector mixing section, an ejector diffusion section, a reflux inlet connector communicating with the hydrogen circulation pump inlet, and a reflux outlet connector communicating with the ejector diffusion section; the cover plate body has pump mounting surfaces for installing a Roots-type hydrogen circulation pump at the positions of the hydrogen circulation pump inlet and the hydrogen circulation pump outlet. The new hydrogen supply module housing includes a new hydrogen inlet connector mounting seat for installing a new hydrogen inlet connector, a hydrogen isolation valve mounting seat for installing a hydrogen isolation valve, a hydrogen proportioning valve mounting seat for installing a hydrogen proportioning valve, and a new hydrogen inlet flow channel for guiding new hydrogen to the ejector mixing section, all integrated on the cover plate body. A new hydrogen inlet nozzle is provided at the new hydrogen inlet flow channel. In this process, unreacted hydrogen gas from the fuel cell anode enters through the reflux inlet connector. When the Roots-type hydrogen circulation pump is operating, the reflux hydrogen gas enters the Roots-type hydrogen circulation pump from the inlet, is pressurized to the outlet of the hydrogen circulation pump, and then is ejected by the high-pressure hydrogen gas from the new hydrogen inlet nozzle through the ejector reflux inlet to the ejector mixing section and the diffusion section. Finally, it returns to the fuel cell inlet through the reflux outlet connector. When the Roots-type hydrogen circulation pump is not operating, the unreacted hydrogen gas from the fuel cell anode outlet flows back into the ejector through the hydrogen one-way valve module.

[0006] In one embodiment of the present invention, the reflux inlet connector and the reflux outlet connector are arranged on the same mounting surface on one side of the cover plate body, and their axes are parallel.

[0007] In one embodiment of the present invention, the housing of the new hydrogen supply module is integrally cast and is disposed on both sides of the cover plate body opposite to the reflux inlet connector or the reflux outlet connector.

[0008] In one embodiment of the present invention, the new hydrogen inlet connector mounting seat, the hydrogen isolation valve mounting seat, and the hydrogen proportioning valve mounting seat are arranged linearly along the same outer side of the cover plate body.

[0009] In one embodiment of the present invention, an outlet flow channel extending radially is provided at the outlet of the hydrogen circulation pump to reduce the gas noise generated by the compression rotor of the Roots-type hydrogen circulation pump when pressurizing the returning hydrogen, and at the same time to store liquid water in the compression chamber.

[0010] In one embodiment of the present invention, a new hydrogen injection hole is machined at the junction of the new hydrogen supply module housing and the hydrogen circulation module. The new hydrogen intake nozzle is installed at the end of the new hydrogen intake channel and extends into the interior of the ejector mixing section after passing through the new hydrogen injection hole. The nozzle axis of the new hydrogen intake nozzle is arranged along the axial direction of the ejector mixing section.

[0011] In one embodiment of the present invention, the housing of the new hydrogen supply module is provided with a water collection cavity on one side of the new hydrogen inlet channel, and a threaded hole is provided on the outer side of the water collection cavity, and a drain plug is detachably installed in the threaded hole.

[0012] In one embodiment of the present invention, the hydrogen one-way valve module includes a hydrogen one-way valve seat, a hydrogen one-way valve housing, a hydrogen one-way valve core, a hydrogen sealing gasket, a pressure regulating gasket, and a spring. The hydrogen one-way valve seat is fastened to the hydrogen one-way valve housing by threads. A hydrogen sealing gasket is provided at one end of the hydrogen one-way valve core near the hydrogen one-way valve seat. The two ends of the spring abut against the pressure adjusting shim and the hydrogen one-way valve core, respectively, so as to tightly attach the hydrogen one-way valve core and the hydrogen sealing gasket to the hydrogen one-way valve seat. The pressure adjusting shim is used to adjust the elastic force of the spring.

[0013] The present invention also provides a fuel cell hydrogen integrated supply system, comprising: a Roots-type hydrogen circulation pump, a new hydrogen inlet connector, a hydrogen isolation valve, a hydrogen proportional valve, and the integrated hydrogen circulation pump cover plate. The Roots-type hydrogen circulation pump is installed on the pump mounting surface of the cover plate body, and its inlet and outlet are connected to the hydrogen circulation pump inlet and outlet gas, respectively. The new hydrogen inlet connector, the hydrogen isolation valve, and the hydrogen proportional valve are respectively installed on the new hydrogen inlet connector mounting seat, the hydrogen isolation valve mounting seat, and the hydrogen proportional valve mounting seat.

[0014] The present invention also provides a hydrogen recycling supply method, based on the aforementioned fuel cell hydrogen integrated supply system, the method comprising: When the fuel cell is working, the recirculated hydrogen from the anode outlet of the fuel cell enters the recirculation inlet connector through the external pipeline, and then enters the hydrogen circulation pump inlet and the Roots-type hydrogen circulation pump in sequence through the flow channel inside the cover plate body. After being pressurized by the Roots-type hydrogen circulation pump, it flows from the outlet of the hydrogen circulation pump through the outlet expansion chamber to the ejector recirculation inlet. Meanwhile, the high-pressure fresh hydrogen from the high-pressure hydrogen storage tank is sequentially introduced into the fresh hydrogen inlet channel through the fresh hydrogen inlet connector, the fresh hydrogen inlet connector installed on the fresh hydrogen inlet connector mounting valve seat, the hydrogen isolation valve installed on the hydrogen isolation valve mounting valve seat, and the hydrogen proportioning valve installed on the hydrogen proportioning valve mounting valve seat. It is then injected into the ejector mixing section through the fresh hydrogen inlet nozzle, mixed with the return hydrogen entering from the ejector return inlet, and diffused and pressurized in the ejector diffusion section. Finally, it is sent back to the fuel cell anode inlet through the return outlet connector. When the Roots-type hydrogen circulation pump is not working, the unreacted hydrogen at the anode outlet of the fuel cell stack flows back into the ejector through the hydrogen check valve module.

[0015] The technical solution of the present invention has the following advantages compared with the prior art: The present invention discloses an integrated hydrogen circulation pump cover plate, a fuel cell hydrogen integrated supply system and method, which integrates an ejector, a hydrogen one-way valve and a Roots-type hydrogen circulation pump cover plate into one unit, and can further integrate and install a new hydrogen inlet connector, a hydrogen isolation valve and a hydrogen proportioning valve on the cover plate, which simplifies the pipeline layout, reduces the space occupation of the hydrogen supply system and improves the hydrogen utilization rate.

[0016] This invention realizes the series integration of a Roots-type hydrogen circulation pump and an ejector. Under high system operating conditions, hydrogen can be returned to the ejector through a hydrogen check valve, and the hydrogen circulation pump stops working, thus optimizing the operating conditions of the hydrogen pump and extending its service life. Attached Figure Description

[0017] To make the content of this invention easier to understand, the invention will be further described in detail below with reference to specific embodiments and accompanying drawings.

[0018] Figure 1 This is a schematic diagram of the integrated hydrogen supply system for fuel cells based on a Roots-type hydrogen circulation pump, according to the present invention.

[0019] Figure 2 This is a schematic diagram of the structure of a hydrogen circulation pump cover plate with an integrated ejector check valve according to the present invention.

[0020] Figure 3 This is a rear view of a hydrogen circulation pump cover plate with an integrated ejector check valve according to the present invention.

[0021] Figure 4 This is a cross-sectional schematic diagram of a hydrogen circulation pump cover plate with an integrated ejector check valve according to the present invention.

[0022] Figure 5 This is a cross-sectional view of the housing of a new hydrogen supply module for a hydrogen circulation pump cover plate with an integrated ejector check valve according to the present invention.

[0023] Figure 6 This is a cross-sectional view of the hydrogen one-way valve module of the hydrogen circulation pump cover plate with integrated ejector one-way valve according to the present invention.

[0024] Explanation of reference numerals in the instruction manual: 1. Return inlet connector; 2. Hydrogen circulation module; 201. Hydrogen circulation pump inlet; 202. Hydrogen circulation pump outlet; 203. Ejector return inlet; 204. Ejector mixing section; 205. Ejector diffusion section; 3. New hydrogen supply module housing; 301. New hydrogen inlet connector mounting seat; 302. Hydrogen isolation valve mounting seat; 303. Hydrogen proportional valve mounting seat; 304. New hydrogen inlet flow channel; 4. Return outlet connector; 5. Hydrogen check valve module; 501. Hydrogen check valve seat; 502. Hydrogen check valve body; 503. Spring; 504. Pressure regulating gasket; 505. Hydrogen check valve core; 506. Hydrogen sealing gasket; 6. New hydrogen inlet nozzle; 7. Drain plug; 8. Roots-type hydrogen circulation pump; 9. New hydrogen inlet connector; 10. Hydrogen isolation valve; 11. Hydrogen proportioning valve. Detailed Implementation

[0025] The present invention will be further described below with reference to the accompanying drawings and specific embodiments, so that those skilled in the art can better understand and implement the present invention. However, the embodiments described are not intended to limit the present invention.

[0026] In this invention, when directions (up, down, left, right, front, and back) are described, it is only for the convenience of describing the technical solution of this invention, and does not indicate or imply that the technical features referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, it should not be construed as a limitation of this invention.

[0027] In this invention, "several" means one or more, "multiple" means two or more, "greater than," "less than," "exceeding," etc., are understood to exclude the stated number; "above," "below," "within," etc., are understood to include the stated number. In the description of this invention, the terms "first" and "second" are used only to distinguish technical features and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or implicitly indicating the order of the indicated technical features.

[0028] In this invention, unless otherwise explicitly defined, the terms "setting," "installing," and "connecting" should be interpreted broadly. For example, they can refer to a direct connection or an indirect connection through an intermediate medium; a fixed connection, a detachable connection, or an integrally formed connection; a mechanical connection, an electrical connection, or a connection capable of mutual communication; or the internal connection of two components or the interaction between two components. Those skilled in the art can reasonably determine the specific meaning of the above terms in this invention based on the specific content of the technical solution.

[0029] Reference Figure 2 , Figure 3 , Figure 4 As shown, an integrated hydrogen circulation pump cover of the present invention includes: Cover plate body; The hydrogen circulation module 2 includes a hydrogen one-way valve module 5 integrated on the cover plate body, a hydrogen circulation pump inlet 201, a hydrogen circulation pump outlet 202, an ejector reflux inlet 203, an ejector mixing section 204, an ejector diffusion section 205, a reflux inlet connector 1 communicating with the hydrogen circulation pump inlet 201, and a reflux outlet connector 4 communicating with the ejector diffusion section 205; the cover plate body has pump mounting surfaces for installing a Roots-type hydrogen circulation pump 8 at the positions of the hydrogen circulation pump inlet 201 and the hydrogen circulation pump outlet 202; the Roots-type hydrogen circulation pump 8 includes components such as a motor, gears, and a pair of compression rotors, which can pressurize and reflux the wet hydrogen gas that has not fully reacted at the anode outlet of the fuel cell stack to the ejector. The new hydrogen supply module housing 3 includes a new hydrogen inlet connector mounting seat 301 for installing a new hydrogen inlet connector 9, a hydrogen isolation valve mounting seat 302 for installing a hydrogen isolation valve 10, a hydrogen proportioning valve mounting seat 303 for installing a hydrogen proportioning valve 11, and a new hydrogen inlet flow channel 304 for guiding new hydrogen to the ejector mixing section 204, wherein a new hydrogen inlet nozzle 6 is provided at the new hydrogen inlet flow channel 304.

[0030] In one embodiment, the reflux inlet connector 1 and the reflux outlet connector 4 are arranged on the same mounting surface on one side of the cover plate body, and their axes are parallel, which facilitates the arrangement of pipelines connected to the fuel cell stack.

[0031] In one embodiment, the new hydrogen supply module housing 3 is integrally cast and is disposed on both sides of the cover plate body opposite to the reflux inlet connector 1 or the reflux outlet connector 4.

[0032] In one embodiment, the new hydrogen inlet connector mounting seat 301, the hydrogen isolation valve mounting seat 302, and the hydrogen proportioning valve mounting seat 303 are arranged linearly along the same outer side of the cover plate body. High-pressure hydrogen from the high-pressure hydrogen storage cylinder can be transported to the ejector in the hydrogen circulation module 2, and then through the ejector mixing section 204, the ejector diffusion section 205, and the return outlet connector to the fuel cell inlet, achieving hydrogen circulation supply. All interfaces are located at the rear end for easy connection to the pipeline of the high-pressure hydrogen storage cylinder.

[0033] In one embodiment, an outlet flow channel extending radially is provided at the outlet 202 of the hydrogen circulation pump, which can effectively reduce the gas noise generated when the compression rotor pressurizes the returning hydrogen. At the same time, it has the function of storing liquid water in the compression chamber, which can alleviate the situation of ice formation inside the chamber at low temperature and is more conducive to low temperature ice breaking.

[0034] Reference Figure 4As shown, a new hydrogen injection hole is machined at the junction of the new hydrogen supply module housing 3 and the hydrogen circulation module 2. The new hydrogen inlet nozzle 6 is installed at the end of the new hydrogen inlet channel 304 and extends into the interior of the ejector mixing section 204 after passing through the new hydrogen injection hole, forming a complete ejector structure and a return gas passage. The nozzle axis of the new hydrogen inlet nozzle 6 is arranged along the axial direction of the ejector mixing section 204. Hydrogen gas that has not fully reacted at the anode of the fuel cell stack enters from the return inlet connector 1. When the Roots-type hydrogen circulation pump 8 is working, the return hydrogen gas enters the hydrogen circulation pump from the hydrogen circulation pump inlet 201, is pressurized to the hydrogen circulation pump outlet 202, and then is ejected by the high-pressure hydrogen gas from the new hydrogen inlet nozzle 6 through the ejector return inlet 203 to the ejector mixing section 204 and the diffusion section, and finally returns to the fuel cell stack inlet from the return outlet connector 4. At this time, because the Roots-type hydrogen circulation pump 8 is working, the gas pressure at the outlet 202 of the hydrogen circulation pump is greater than that at the inlet 201 of the hydrogen circulation pump, causing the hydrogen one-way valve module 5 to close, preventing the pressurized gas from flowing back and leaking. When the Roots-type hydrogen circulation pump 8 is not working, the returning hydrogen directly reaches the ejector return inlet 203 through the hydrogen one-way valve module 5. At this time, the pair of compression rotor shafts inside the Roots-type hydrogen circulation pump 8 form a relatively sealed structure with the cavity, which can prevent gas backflow.

[0035] In one embodiment, the housing 3 of the new hydrogen supply module is provided with a water collection chamber on one side of the new hydrogen inlet channel 304, and a threaded hole is provided on the outer side of the water collection chamber, and a drain plug 7 is detachably installed in the threaded hole.

[0036] Reference Figure 5 As shown, the new hydrogen supply module housing 3 includes a new hydrogen inlet connector mounting seat 301, a hydrogen isolation valve mounting seat 302, a hydrogen proportioning valve mounting seat 303, a new hydrogen inlet flow channel 304, and a new hydrogen inlet nozzle 6. High-pressure hydrogen from the high-pressure hydrogen storage tank enters the hydrogen isolation valve 10 through the new hydrogen inlet connector 9. Electrical control introduces the high-pressure hydrogen into the new hydrogen inlet flow channel 304. Then, through the adjustment of the hydrogen proportioning valve 11, the high-pressure hydrogen is introduced into the new hydrogen inlet nozzle 6 and enters the ejector mixing section 204 for ejection of reflux hydrogen. The hydrogen isolation valve mounting seat 302 and the hydrogen proportioning valve mounting seat 303 are located on the same side of the new hydrogen supply module housing 3, optimizing space utilization and facilitating wiring installation.

[0037] Reference Figure 6 As shown, the hydrogen one-way valve module (5) includes a hydrogen one-way valve seat 501, a hydrogen one-way valve housing 502, a hydrogen one-way valve core 505, a hydrogen sealing gasket 506, a spring 503, and a pressure regulating gasket 504. The hydrogen one-way valve seat 501 is fastened to the hydrogen one-way valve housing 502 by threads. A hydrogen sealing gasket 506 is provided at one end of the hydrogen one-way valve core 505 near the hydrogen one-way valve seat 501. The two ends of the spring 503 abut against the pressure regulating pad 504 and the hydrogen one-way valve core 505 respectively, so as to tightly attach the hydrogen one-way valve core 505 and the hydrogen sealing gasket 506 to the hydrogen one-way valve seat 501. The pressure regulating pad 504 is used to adjust the elastic force of the spring 503 so that the one-way valve opening pressure is maintained at 0.1 kPa before being installed into the hydrogen circulation module 2.

[0038] Reference Figure 1 As shown, this embodiment also provides a fuel cell hydrogen integrated supply system, including: a Roots-type hydrogen circulation pump 8, a new hydrogen inlet connector 9, a hydrogen isolation valve 10, a hydrogen proportional valve 11, and the integrated hydrogen circulation pump cover plate. The Roots-type hydrogen circulation pump 8 is installed on the pump mounting surface of the cover plate body, and its inlet and outlet are respectively connected to the hydrogen circulation pump inlet 201 and hydrogen circulation pump outlet 202. The new hydrogen inlet connector 9, the hydrogen isolation valve 10, and the hydrogen proportioning valve 11 are respectively installed on the new hydrogen inlet connector mounting seat 301, the hydrogen isolation valve mounting seat 302, and the hydrogen proportioning valve mounting seat 303.

[0039] It should be noted that the hydrogen fuel cell system mainly consists of modules such as a hydrogen supply system, an air supply system, a hydrothermal management system, an electronic control system, and a fuel cell stack. The main function of the hydrogen supply system is to guide the incompletely reacted wet hydrogen from the fuel cell stack anode outlet and the fresh hydrogen from the high-pressure hydrogen storage tank to the fuel cell stack inlet through components such as the hydrogen isolation valve 10, the hydrogen proportional valve 11, the ejector, the hydrogen circulation pump, and the hydrogen check valve, thereby improving hydrogen utilization efficiency.

[0040] However, in existing hydrogen supply systems, the components are relatively independent with low integration. Pipelines are needed to connect the components, making installation complex, space-consuming, and exacerbating energy loss of hydrogen in the loop, thus reducing hydrogen utilization efficiency.

[0041] Therefore, this invention integrates the ejector, hydrogen check valve, and Roots-type hydrogen circulation pump 8 cover plate into one unit. A new hydrogen inlet connector 9, hydrogen isolation valve 10, and hydrogen proportioning valve 11 can be further integrated and installed on the cover plate, greatly simplifying the pipeline layout of the hydrogen supply system, improving space utilization, reducing energy loss, and achieving efficient hydrogen circulation supply. Under high system operating conditions, hydrogen can be returned to the ejector through the hydrogen check valve, and the hydrogen circulation pump will stop operating, optimizing the operating conditions of the hydrogen pump and extending its service life.

[0042] Figure 1The principle is to connect the Roots-type hydrogen circulation pump 8 in series with the ejector. The advantage of this series connection is that under low-operation conditions, the ejector's ejection capacity may not meet the hydrogen flow and pressure rise requirements of the fuel cell stack. The Roots-type hydrogen circulation pump 8 can recirculate and pressurize the incompletely reacted hydrogen from the fuel cell stack anode outlet, allowing it to re-enter the stack, improving ejection efficiency and preventing damage to the stack due to insufficient gas supply. The disadvantage of this series connection is that under high-operation conditions, the ejector's hydrogen flow capacity can meet the stack's needs and eject the anode return gas, reducing the role of the hydrogen circulation pump, which can then operate at low speed or be shut down. However, in the series connection, the Roots-type hydrogen circulation pump's inlet and outlet are not connected when it stops operating. If it is to be used in series with the ejector, the Roots-type hydrogen circulation pump 8 must operate at high power continuously, worsening the operating conditions, shortening its lifespan, and generating parasitic power and vibration noise. Therefore, the hydrogen check valve module 5 is connected in parallel with the Roots-type hydrogen circulation pump 8, so that the Roots-type hydrogen circulation pump 8 does not work when the fuel cell stack system is under high operating conditions, and the hydrogen that has not fully reacted at the fuel cell stack anode outlet flows back to the ejector normally through the hydrogen check valve module 5.

[0043] This embodiment also provides a hydrogen recycling supply method, based on the aforementioned fuel cell hydrogen integrated supply system, the method comprising: When the fuel cell is working, the recirculated hydrogen from the anode outlet of the fuel cell enters the recirculation inlet connector 1 through the external pipeline, and enters the hydrogen circulation pump inlet 201 and the Roots-type hydrogen circulation pump 8 in sequence through the flow channel inside the cover plate body. After being pressurized by the Roots-type hydrogen circulation pump 8, it flows from the hydrogen circulation pump outlet 202 through the outlet expansion chamber to the ejector recirculation inlet 203. Simultaneously, the high-pressure fresh hydrogen from the high-pressure hydrogen storage cylinder is sequentially introduced into the fresh hydrogen inlet channel 304 through the fresh hydrogen inlet connector 9, the fresh hydrogen inlet connector 9 installed on the fresh hydrogen inlet connector mounting valve seat 301, the hydrogen isolation valve 10 installed on the hydrogen isolation valve mounting valve seat 302, and the hydrogen proportioning valve 11 installed on the hydrogen proportioning valve mounting valve seat 303. It is then injected into the ejector mixing section 204 through the fresh hydrogen inlet nozzle 6, mixed with the return hydrogen entering from the ejector return inlet 203, diffused and pressurized in the ejector diffusion section 205, and finally sent back to the fuel cell anode inlet through the return outlet connector 4. When the Roots-type hydrogen circulation pump 8 is not working, the unreacted hydrogen at the anode outlet of the fuel cell stack flows back to the ejector through the hydrogen one-way valve module 5.

[0044] Finally, it should be noted that the above specific embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to examples, those skilled in the art should understand that modifications or equivalent substitutions can be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions of the present invention, and all such modifications or substitutions should be covered within the scope of the claims of the present invention.

Claims

1. An integrated hydrogen circulation pump cover, characterized in that, include: Cover plate body; The hydrogen circulation module (2) includes a hydrogen one-way valve module (5) integrated on the cover plate body, a hydrogen circulation pump inlet (201), a hydrogen circulation pump outlet (202), an ejector return inlet (203), an ejector mixing section (204), an ejector diffusion section (205), a return inlet connector (1) communicating with the hydrogen circulation pump inlet (201), and a return outlet connector (4) communicating with the ejector diffusion section (205); the cover plate body has pump mounting surfaces for installing a Roots-type hydrogen circulation pump (8) at the positions of the hydrogen circulation pump inlet (201) and the hydrogen circulation pump outlet (202); The new hydrogen supply module housing (3) includes a new hydrogen inlet connector mounting seat (301) for installing a new hydrogen inlet connector (9), a hydrogen isolation valve mounting seat (302) for installing a hydrogen isolation valve (10), a hydrogen proportioning valve mounting seat (303) for installing a hydrogen proportioning valve (11), and a new hydrogen inlet flow channel (304) for guiding new hydrogen to the ejector mixing section (204), wherein a new hydrogen inlet nozzle (6) is provided at the new hydrogen inlet flow channel (304); In this process, unreacted hydrogen gas from the anode of the fuel cell stack enters through the reflux inlet connector (1). When the Roots-type hydrogen circulation pump (8) is working, the reflux hydrogen gas enters the Roots-type hydrogen circulation pump (8) from the hydrogen circulation pump inlet (201), is pressurized to the hydrogen circulation pump outlet (202), and then is ejected by the high-pressure hydrogen gas from the new hydrogen inlet nozzle (6) through the ejector reflux inlet (203) to the ejector mixing section (204) and the diffusion section. Finally, it returns to the fuel cell stack inlet from the reflux outlet connector (4). When the Roots-type hydrogen circulation pump (8) is not working, the unreacted hydrogen gas from the anode outlet of the fuel cell stack flows back to the ejector through the hydrogen one-way valve module (5).

2. The integrated hydrogen circulation pump cover plate according to claim 1, characterized in that, The reflux inlet connector (1) and the reflux outlet connector (4) are arranged on the same mounting surface on one side of the cover plate body, and their axes are parallel.

3. The integrated hydrogen circulation pump cover plate according to claim 2, characterized in that, The housing (3) of the new hydrogen supply module is integrally cast and is disposed on both sides of the cover plate body opposite to the reflux inlet connector (1) or the reflux outlet connector (4).

4. The integrated hydrogen circulation pump cover plate according to claim 1, characterized in that, The new hydrogen inlet connector mounting seat (301), the hydrogen isolation valve mounting seat (302), and the hydrogen proportional valve mounting seat (303) are arranged linearly along the same outer side of the cover plate body.

5. An integrated hydrogen circulation pump cover plate according to claim 1, characterized in that, An outlet flow channel extending radially is provided at the outlet (202) of the hydrogen circulation pump to reduce the gas noise generated by the compression rotor of the Roots-type hydrogen circulation pump (8) when pressurizing the return hydrogen, and at the same time to store liquid water in the compression chamber.

6. The integrated hydrogen circulation pump cover plate according to claim 1, characterized in that, A new hydrogen injection hole is machined at the junction of the new hydrogen supply module housing (3) and the hydrogen circulation module (2). The new hydrogen intake nozzle (6) is installed at the end of the new hydrogen intake channel (304) and extends into the interior of the ejector mixing section (204) after passing through the new hydrogen injection hole. The nozzle axis of the new hydrogen intake nozzle (6) is arranged along the axial direction of the ejector mixing section (204).

7. An integrated hydrogen circulation pump cover plate according to claim 5, characterized in that, The housing (3) of the new hydrogen supply module has a water collection chamber on one side of the new hydrogen inlet channel (304). A threaded hole is provided on the outside of the water collection chamber, and a drain plug (7) is detachably installed in the threaded hole.

8. An integrated hydrogen circulation pump cover plate according to claim 1, characterized in that, The hydrogen one-way valve module (5) includes a hydrogen one-way valve seat (501), a hydrogen one-way valve housing (502), a hydrogen one-way valve core (505), a hydrogen sealing gasket (506), a spring (503), and a pressure regulating gasket (504). The hydrogen one-way valve seat (501) is fastened to the hydrogen one-way valve housing (502) by threads. A hydrogen sealing gasket (506) is provided at one end of the hydrogen one-way valve core (505) near the hydrogen one-way valve seat (501). The two ends of the spring (503) abut against the pressure regulating pad (504) and the hydrogen one-way valve core (505) respectively, so as to tightly attach the hydrogen one-way valve core (505) and the hydrogen sealing gasket (506) to the hydrogen one-way valve seat (501). The pressure regulating pad (504) is used to adjust the elastic force of the spring (503).

9. A fuel cell hydrogen supply system, characterized in that, include: Roots-type hydrogen circulation pump (8), new hydrogen inlet connector (9), hydrogen isolation valve (10), hydrogen proportional valve (11), and integrated hydrogen circulation pump cover as described in any one of claims 1-8; The Roots-type hydrogen circulation pump (8) is installed on the pump mounting surface of the cover plate body, and its inlet and outlet are respectively connected to the hydrogen circulation pump inlet (201) and hydrogen circulation pump outlet (202). The new hydrogen inlet connector (9), the hydrogen isolation valve (10), and the hydrogen proportioning valve (11) are respectively installed on the new hydrogen inlet connector mounting seat (301), the hydrogen isolation valve mounting seat (302), and the hydrogen proportioning valve mounting seat (303).

10. A method for circulating hydrogen supply, characterized in that, Based on the fuel cell hydrogen integrated supply system of claim 9, the method includes: When the fuel cell is working, the reflux hydrogen from the anode outlet of the fuel cell enters the reflux inlet connector (1) through the external pipeline, and enters the hydrogen circulation pump inlet (201) and the Roots hydrogen circulation pump (8) in sequence through the flow channel inside the cover plate body. After being pressurized by the Roots hydrogen circulation pump (8), it flows from the hydrogen circulation pump outlet (202) through the outlet expansion chamber to the ejector reflux inlet (203). Meanwhile, the high-pressure new hydrogen from the high-pressure hydrogen storage tank is sequentially introduced into the new hydrogen inlet channel (304) through the new hydrogen inlet connector (9), the new hydrogen inlet connector (9) installed on the new hydrogen inlet connector mounting valve seat (301), the hydrogen isolation valve (10) installed on the hydrogen isolation valve mounting valve seat (302), and the hydrogen proportion valve (11) installed on the hydrogen proportion valve mounting valve seat (303), and then injected into the ejector mixing section (204) through the new hydrogen inlet nozzle (6). After mixing with the return hydrogen entering from the ejector return inlet (203), the hydrogen diffuses and rises in pressure in the ejector diffusion section (205), and is finally sent back to the fuel cell anode inlet through the return outlet connector (4). When the Roots-type hydrogen circulation pump (8) is not working, the unreacted hydrogen at the anode outlet of the fuel cell stack flows back to the ejector through the hydrogen check valve module (5).

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