Fuel cell hydrogen cycle series integrated structure

Abstract

The utility model relates to the technical field of fuel cells, in particular to a hydrogen circulation series integrated structure of a fuel cell. The hydrogen circulating pump comprises a hydrogen circulating pump inlet and a hydrogen circulating pump outlet, an ejector shell is arranged on one side of a pump head of the hydrogen circulating pump, an ejector backflow ejection cavity, an ejector mixing cavity and an ejector outlet are formed in the ejector shell, the upper end of the ejector shell is fixedly connected with a proportional valve seat through a bolt, and the lower end of the ejector shell is fixedly connected with the proportional valve seat through a bolt. The lower end of the proportional valve seat is integrally connected with the ejector nozzle, and the ejector nozzle penetrates through the ejector shell to be communicated with the ejector mixing cavity. Compared with the prior art, the hydrogen circulating pump, the ejector and the proportional valve are highly integrated together, a gas flow channel is shortened, flow resistance is reduced, and the backflow performance is better. The integrated module is small in size and light in weight, pipeline connection is saved, and cost is reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to fuel cell technical field, concretely speaking, a kind of fuel cell hydrogen circulation series connection integrated structure. BACKGROUND

[0002] In fuel cell system, in order to make the reaction inside fuel cell stack sufficient, promote output performance, usually supply excess hydrogen and air.The role of hydrogen circulation system is to recycle the unreacted hydrogen in fuel cell stack to the hydrogen inlet of fuel cell stack again, to save hydrogen fuel, improve hydrogen utilization rate.Currently, hydrogen circulation core device is mainly hydrogen circulation pump and ejector, adopt the scheme of series connection of ejector and hydrogen circulation pump, mutually cooperate to realize the pressure boosting of hydrogen.But hydrogen circulation pump, ejector and proportional valve are usually connected by pipeline, installation is troublesome, operation is complex, and problems such as large volume exist.

[0003] Through retrieval, China patent application No.CN202211306908.6 discloses a kind of integrated valve ejector type hydrogen circulation pump, hydrogen circulation pump, ejector, proportional valve are integrated together, one side of proportional valve is connected with low pressure suction chamber of ejector through U-shaped channel, to solve the problem that hydrogen circulation pump and ejector, on-off valve and proportional valve are low in integration degree, large in occupied space, complex in field installation, but its low-pressure backflow path turns more, flow resistance is big, backflow performance is poor. UTILITY MODEL CONTENT

[0004] To solve the problems raised in the above background art, the purpose of the present utility model is to provide a kind of fuel cell hydrogen circulation series connection integrated structure, the hydrogen circulation pump includes hydrogen circulation pump import and hydrogen circulation pump export, hydrogen circulation pump pump head one side is equipped with ejector shell, the ejector shell is equipped with ejector backflow cavity, ejector mixing chamber and ejector export in, the upper end of the ejector shell is fixedly connected proportional valve seat by bolt, the lower end of proportional valve seat is integrated with the connection of ejector nozzle, the ejector nozzle passes through the communication of ejector shell and ejector mixing chamber.

[0005] The hydrogen circulation pump pump head and the ejector shell are fixedly connected by bolt or integrated.

[0006] The hydrogen circulation pump export is communicated with the ejector backflow cavity in the ejector shell.

[0007] The upper end of the proportional valve seat and the proportional valve are fixedly connected by bolt.

[0008] The proportional valve seat one side is equipped with proportional valve hydrogen import.

[0009] The ejector nozzle is L-shaped.

[0010] Compared with the prior art, the hydrogen circulating pump, the ejector and the proportional valve are highly integrated, the gas flow channel is shortened, the flow resistance is reduced, and the backflow performance is better. BRIEF DESCRIPTION OF DRAWINGS

[0011] Figure 1 It is a structural schematic view of the utility model.

[0012] Referring to Figure 1 , 1, hydrogen circulating pump; 2, ejector shell; 3, proportional valve; 4, proportional valve seat; 1-1, hydrogen circulating pump inlet; 1-2, hydrogen circulating pump outlet; 2-1, ejector backflow cavity; 2-2, ejector outlet; 2-3, ejector mixing cavity; 4-1, proportional valve hydrogen inlet; 4-2, ejector nozzle. DETAILED DESCRIPTION

[0013] The utility model will be further described below according to the drawings.

[0014] As Figure 1 Indicated, hydrogen circulating pump 1 is equipped with hydrogen circulating pump inlet 1-1 and hydrogen circulating pump outlet 1-2, and the pump head of hydrogen circulating pump 1 is fixedly connected or integrally integrated with ejector shell 2 through bolts, thereby reducing the structural volume and occupying less space.

[0015] Ejector shell 2 is provided with ejector backflow cavity 2-1, ejector mixing cavity 2-3 and ejector outlet 2-2, the upper end of ejector shell 2 is fixedly connected with proportional valve seat 4 through bolts, the lower end of proportional valve seat 4 is connected with ejector nozzle 4-2 integrally, and ejector nozzle 4-2 communicates with ejector shell 2 and ejector mixing cavity 2-3, thereby reducing the pipeline connection, reducing the cost and improving the transmission efficiency.

[0016] Hydrogen circulating pump outlet 1-2 communicates with ejector backflow cavity 2-1 in ejector shell 2, and the gas is directly introduced into the ejector to reduce the energy loss in the transmission process and improve the transmission efficiency.

[0017] The upper end of proportional valve seat 4 is fixedly connected with proportional valve 3 through bolts, and one side is provided with proportional valve hydrogen inlet 4-1.

[0018] Ejector nozzle 4-2 is L-shaped, the transmission distance is short, the loss generated in the transmission process is small, and the supercharging efficiency is improved.

[0019] In use, the hydrogen circulation pump 1 is operated, gas enters from the hydrogen circulation pump inlet 1-1, is pressurized in the hydrogen circulation pump 1, and is introduced into the ejector backflow cavity 2-1 from the hydrogen circulation pump outlet 1-2. New hydrogen enters from the proportional valve hydrogen inlet 4-1, the proportional valve 3 controls the flow proportion of the gas to ensure the stability and efficiency of the system, and the high-pressure driving fluid is introduced into the ejector mixing cavity 2-3 from the ejector nozzle 4-2 connected with the proportional valve seat 4, and the gas is mixed and discharged from the ejector outlet 2-2.

Claims

1. A fuel cell hydrogen recycle tandem integration structure, characterized by: The utility model relates to a hydrogen circulation pump (1), an ejector shell (2) and a proportional valve seat (4), wherein the hydrogen circulation pump (1) comprises a hydrogen circulation pump inlet (1-1) and a hydrogen circulation pump outlet (1-2); the hydrogen circulation pump (1) is provided with the ejector shell (2) on one side of the pump head; the ejector shell (2) is internally provided with an ejector backflow cavity (2-1), an ejector mixing cavity (2-3) and an ejector outlet (2-2); the upper end of the ejector shell (2) is fixedly connected with the proportional valve seat (4) through bolts; the lower end of the proportional valve seat (4) is connected with an ejector nozzle (4-2) in an integrated manner; the ejector nozzle (4-2) is in communication with the ejector shell (2) and the ejector mixing cavity (2-3).

2. The fuel cell hydrogen cycle series integration structure according to claim 1, characterized by: The pump head of the hydrogen circulation pump (1) and the ejector shell (2) are fixedly connected through bolts or integrated.

3. The fuel cell hydrogen cycle series integration structure according to claim 1, characterized by: The hydrogen circulation pump outlet (1-2) is in communication with the ejector backflow cavity (2-1) in the ejector shell (2).

4. The fuel cell hydrogen cycle series integration structure according to claim 1, characterized by: The upper end of the proportional valve seat (4) and the proportional valve (3) are fixedly connected through bolts.

5. The fuel cell hydrogen cycle series integration structure according to claim 1, characterized by: The proportional valve seat (4) is provided with a proportional valve hydrogen inlet (4-1) on one side.

6. The fuel cell hydrogen cycle series integration structure according to claim 1, characterized by: The ejector nozzle (4-2) is L-shaped.

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