Air compressor for fuel cell system and fuel cell system

Abstract

The utility model provides an air compressor for a fuel cell system and the fuel cell system, and relates to the technical field of fuel cell air supply systems, the air compressor comprises an air compressor main body, a primary air compression mechanism, a cooling mechanism and a secondary air compression mechanism, primary compressed air output by the primary air compression mechanism can be cooled through the cooling mechanism, so that the inlet air temperature of secondary compression is lower, the outlet air temperature of secondary compressed air subjected to secondary compression by the secondary air compression mechanism is reduced, the density is increased, and the air inlet amount of the galvanic pile system can be partially increased; meanwhile, the performance requirement of the fuel cell system on the intercooler can be reduced, the price reduction and the size reduction of the intercooler are optimized, and the technical problems that in the prior art, an air supply system of the fuel cell system needs to guarantee the performance requirement of the intercooler, so that the cost is high, and the occupied area is large are solved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cell air supply systems, in particular to an air compressor and a fuel cell system used in a fuel cell system. Background Art

[0002] The fuel cell system is an electrochemical energy conversion device that directly converts the chemical energy in the reactants into electrical energy. It has the characteristics of cleanliness, high efficiency, rapid response and wide application range. The fuel cell system is generally composed of a stack system, an air supply system, a hydrogen supply system, a cooling system, an electrical system and a load-bearing integrated system. Among them, the air supply system is used to provide the air required for the reaction and discharge the gas after the reaction outside the system. It has the following key components: air compressor: compresses the air to increase the pressure and density of the air; intercooler: cools the high-temperature air compressed by the air compressor (referred to as the air compressor) to meet the stack inlet air temperature requirements.

[0003] In the prior art, according to the characteristics of the fuel cell stack in the fuel cell system, the stack has a certain range of value requirements for the required reaction air temperature. The temperature of the air compressed by the air compressor is relatively high and cannot be directly supplied to the stack system for reaction. Therefore, it is often necessary to add an intercooler at the rear end of the air compressor to cool the high-temperature air compressed by the air compressor.

[0004] However, the heat dissipation performance of the intercooler needs to meet certain conditions to ensure the air intake temperature of the battery stack system. The higher the heat dissipation performance requirements of the intercooler, the higher its price and volume will be, resulting in technical problems of high cost and large floor space. For example, in order to effectively reduce the temperature of the air compressed by the air compressor, it is mainly achieved through the large flow of coolant in the intercooler, and this large flow of coolant performance is only available in large-volume and therefore higher-priced intercoolers. Utility Model Content

[0005] The utility model aims to provide an air compressor and a fuel cell system for a fuel cell system, so as to alleviate the technical problem in the prior art that the air supply system of the fuel cell system needs to ensure the performance requirements of the intercooler, resulting in high cost and large floor space.

[0006] The utility model provides an air compressor for a fuel cell system, comprising: an air compressor body, a first-stage air compression mechanism, a cooling mechanism and a second-stage air compression mechanism;

[0007] The first-stage air compression mechanism and the second-stage air compression mechanism are respectively located at two ends of the air compressor body, and the first-stage air compression mechanism and the second-stage air compression mechanism are respectively connected to the air compressor body, and the cooling mechanism is located outside the air compressor body and is in line contact with the air compressor body;

[0008] The first-stage air compression mechanism is connected to the second-stage air compression mechanism through the cooling mechanism. The first-stage air compression mechanism forms first-stage compressed air based on the air compressor body, and the first-stage air compression mechanism transports the first-stage compressed air to the second-stage air compression mechanism through the cooling mechanism. The cooling mechanism is used to cool the first-stage compressed air. The second-stage air compression mechanism forms second-stage compressed air based on the air compressor body and discharges it.

[0009] In a preferred embodiment of the utility model, the cooling mechanism includes a delivery pipeline and a cooling pipeline, and the delivery pipeline and the cooling pipeline are both cylindrical;

[0010] The cooling pipe is sleeved on the outside of the conveying pipe, and a cooling cavity is formed between the cooling pipe and the conveying pipe. The two ends of the conveying pipe are respectively connected to the first-stage air compression mechanism and the second-stage air compression mechanism. The cooling cavity is used for flowing a cooling liquid, and the cooling cavity cools the first-stage compressed air flowing in the conveying pipe through the cooling liquid.

[0011] In a preferred embodiment of the utility model, the cooling mechanism further includes a coolant inlet and a coolant outlet;

[0012] The coolant inlet and the coolant outlet are respectively connected to the cooling pipe, and the coolant inlet and the coolant outlet are respectively communicated with the cooling cavity, and the delivery direction of the coolant from the coolant inlet to the coolant outlet is opposite to the delivery direction of the primary compressed air flowing in the delivery pipe.

[0013] In a preferred embodiment of the utility model, the first-stage air compression mechanism includes a first-stage air compression cover and a first connecting pipe;

[0014] The first-stage air compression cover is sealed and connected to the air compressor body, and a first-stage compression space is formed between the first-stage air compression cover and the air compressor body. The first connecting pipe is connected to the first-stage air compression cover, and the first connecting pipe is connected to the first-stage compression space. The other end of the first connecting pipe is sealed and connected to the delivery pipeline.

[0015] In a preferred embodiment of the utility model, it also includes a sealing gasket;

[0016] One end of the first connecting pipe connected to the delivery pipe has a first flange sealing surface, and the end of the cooling pipe corresponding to the first flange sealing surface has a second flange sealing surface. The sealing gasket is located between the first flange sealing surface and the second flange sealing surface, and the first connecting pipe is butt-sealed and connected with the second flange sealing surface of the cooling pipe through the first flange sealing surface.

[0017] In a preferred embodiment of the utility model, the two-stage air compression mechanism includes a two-stage air compression cover and a second connecting pipe;

[0018] The secondary air compression cover is sealed and connected to the air compressor body, and a secondary compression space is formed between the secondary air compression cover and the air compressor body. The second connecting pipe is connected to the secondary air compression cover, and the second connecting pipe is connected to the secondary compression space. The other end of the second connecting pipe is sealed and connected to the delivery pipeline.

[0019] In a preferred embodiment of the present invention, the secondary air pressure cover, the second connecting pipe and the cooling mechanism are integrally formed.

[0020] In a preferred embodiment of the present invention, the first-stage compressed air cover and the first connecting pipe are integrally formed.

[0021] In a preferred embodiment of the utility model, the axial direction of the first connecting pipe forms an angle with the axial direction of the first-stage compressor cover, and the axial direction of the second connecting pipe forms an angle with the axial direction of the second-stage compressor cover, so that the cooling mechanism is located outside the air compressor body.

[0022] In a preferred embodiment of the utility model, the air compressor is provided in plurality, wherein the compressed air outlet of the secondary air compression mechanism of one air compressor is connected to the air inlet of the primary air compression mechanism of the adjacent air compressor.

[0023] The utility model provides a fuel cell system, comprising the air compressor for the fuel cell system.

[0024] The utility model provides an air compressor for a fuel cell system, comprising: an air compressor body, a first-stage air compression mechanism, a cooling mechanism and a second-stage air compression mechanism. Compared with the single-stage air compressor compression, the present application can cool down the first-stage compressed air output by the first-stage air compression mechanism through the cooling mechanism, so that the intake temperature of the second-stage compression is lower, so that the temperature of the air output by the second-stage air compression mechanism is also lower, which can reduce the performance requirements of the fuel cell system for the intercooler, and has a positive effect on reducing the price and volume of the intercooler.

[0025] In addition, as an additional technical effect, the outlet temperature of the secondary compressed air after secondary compression by the secondary air compression mechanism is reduced and the density is increased, which can partially increase the air intake volume of the fuel cell system. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0027] Figure 1 A schematic diagram of the overall structure of an air compressor for a fuel cell system provided by an embodiment of the utility model;

[0028] Figure 2 A schematic diagram of the explosion structure of an air compressor for a fuel cell system provided by an embodiment of the utility model;

[0029] Figure 3 A schematic diagram of a partial cross-sectional structure of an air compressor for a fuel cell system provided by an embodiment of the utility model;

[0030] Figure 4 A schematic structural diagram of a first-stage air compression mechanism of an air compressor for a fuel cell system provided in an embodiment of the utility model;

[0031] Figure 5 A schematic structural diagram of a two-stage air compression mechanism of an air compressor for a fuel cell system provided in an embodiment of the utility model;

[0032] Figure 6 A schematic structural diagram of a sealing gasket for an air compressor of a fuel cell system provided by an embodiment of the utility model;

[0033] Figure 7 A schematic structural diagram of the multi-stage compression of an air compressor for a fuel cell system provided in an embodiment of the utility model.

[0034] Icons: 100-air compressor body; 200-first-stage air compression mechanism; 210-first-stage air compression cover; 211-first-stage air inlet; 212-first-stage compression space; 220-first connecting pipe; 221-first flange sealing surface; 222-first-stage air outlet; 300-cooling mechanism; 310-delivery pipeline; 320-cooling pipeline; 321-coolant inlet; 322-coolant outlet; 323-second flange sealing surface; 330-cooling cavity; 400-second-stage air compression mechanism; 410-second-stage air compression cover; 411-second-stage compression space; 412-second-stage air outlet; 420-second connecting pipe; 500-sealing pad; 510-sealing rib. DETAILED DESCRIPTION

[0035] The technical solution of the utility model will be clearly and completely described below in conjunction with the embodiments. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0036] like Figure 1-Figure 7 As shown, the present embodiment provides an air compressor for a fuel cell system, comprising: an air compressor body 100, a first-stage air compression mechanism 200, a cooling mechanism 300 and a second-stage air compression mechanism 400; the first-stage air compression mechanism 200 and the second-stage air compression mechanism 400 are respectively located at two ends of the air compressor body 100, and the first-stage air compression mechanism 200 and the second-stage air compression mechanism 400 are respectively connected to the air compressor body 100, and the cooling mechanism 300 is located on the outside of the air compressor body 100 and in line contact with the air compressor body 100; the first-stage air compression mechanism 200 is connected to the second-stage air compression mechanism 400 through the cooling mechanism 300, the first-stage air compression mechanism 200 forms a first-stage compressed air based on the air compressor body 100, and the first-stage air compression mechanism 200 conveys the first-stage compressed air to the second-stage air compression mechanism 400 through the cooling mechanism 300, the cooling mechanism 300 is used to cool the first-stage compressed air, and the second-stage air compression mechanism 400 forms the cooled first-stage compressed air based on the air compressor body 100 to discharge.

[0037] It should be noted that the air compressor for the fuel cell system provided in this embodiment has a compressor body 100 with compression ends respectively between two opposite ends, and the first-stage compression mechanism 200 and the second-stage compression mechanism 400 can be connected to the compressor body 100 based on the two opposite compression ends of the compressor body 100, and the first-stage compression mechanism 200 can perform first-stage compression based on one end of the compressor body 100 to form first-stage compressed air. The cooling mechanism 300 can cool the first-stage compressed air, which can effectively reduce the temperature of the air after the first-stage compression, and the cooled first-stage compressed air will be secondarily compressed through the second-stage compression mechanism 400 to form second-stage compressed air discharge; inter-stage cooling is achieved through the cooling mechanism 300, so that the temperature of the second-stage compressed air when discharged is lower than the temperature of direct discharge in the prior art, and the density of the second-stage compressed air is greater, which can help increase the air intake of the stack system and reduce the performance requirements of the fuel cell system for the intercooler.

[0038] In the above-mentioned air compressor, the cooling mechanism 300 is located outside the air compressor body 100 and is in line contact with the air compressor body 100. The line contact neither causes the air compressor structure to be incompact due to the separate arrangement of the two, nor causes the air compressor body 100 to vibrate violently during operation due to the large-area contact between the two, thereby affecting the life and working performance of the cooling mechanism 300. In this way, the cooling mechanism 300 and the air compressor body 100 are made compact in structure while avoiding the vigorous vibration of the air compressor body 100 during operation, thereby affecting the life and working performance of the cooling mechanism 300.

[0039] The present embodiment provides an air compressor for a fuel cell system, comprising: an air compressor body 100, a first-stage air compression mechanism 200, a cooling mechanism 300, and a second-stage air compression mechanism 400. Compared with the single-stage air compressor compression, the present application can cool down the first-stage compressed air output by the first-stage air compression mechanism 200 through the cooling mechanism 300, so that the intake temperature of the second-stage compression is lower, so that the temperature of the air output by the second-stage air compression mechanism is also lower, which can reduce the performance requirements of the fuel cell system for the intercooler, and has a positive effect on reducing the price and volume of the intercooler, and alleviates the technical problem that the air supply system of the fuel cell system in the prior art needs to ensure the performance requirements of the intercooler, resulting in high cost and large floor space.

[0040] In addition, as an additional technical effect, the outlet temperature of the secondary compressed air after the secondary compression by the secondary air compression mechanism 400 is reduced and the density is increased, which can partially increase the air intake volume of the fuel cell system.

[0041] On the basis of the above embodiments, further, in a preferred embodiment of the utility model, the cooling mechanism 300 includes a delivery pipe 310 and a cooling pipe 320, and the delivery pipe 310 and the cooling pipe 320 are both cylindrical; the cooling pipe 320 is sleeved on the outside of the delivery pipe 310, and a cooling cavity 330 is formed between the cooling pipe 320 and the delivery pipe 310, and the two ends of the delivery pipe 310 are respectively connected to the first-stage air compression mechanism 200 and the second-stage air compression mechanism 400, and the cooling cavity 330 is used to flow cooling liquid, and the cooling cavity 330 cools the first-stage compressed air flowing in the delivery pipe 310 through the cooling liquid.

[0042] In this embodiment, the delivery pipe 310 and the cooling pipe 320 are both cylindrical, and the cylindrical arrangement enables the cooling pipe 320 to be in line contact with the air compressor body 100. At the same time, the cylindrical arrangement can ensure that the surface area of ​​the cooling pipe 320 is minimized when a certain volume of coolant flows, further reducing the impact from the air compressor body 100 or other external objects.

[0043] In this embodiment, a sleeve structure is formed between the delivery pipe 310 and the cooling pipe 320, that is, a cooling cavity 330 is arranged in an outer ring along the delivery pipe 310, and the delivery pipe 310 can form a sealed connection with the first-stage air compression mechanism 200 and the second-stage air compression mechanism 400 respectively, that is, the delivery pipe 310 can deliver the first-stage compressed air to the second-stage air compression mechanism 400. In the process of the delivery pipe 310 delivering the first-stage compressed air, the cooling pipe 320 circulates coolant into the cooling cavity 330, and utilizes heat exchange and cooling between the coolant and the first-stage compressed air to ensure the cooling of the first-stage compressed air.

[0044] In a preferred embodiment of the utility model, the cooling mechanism 300 also includes a cooling liquid inlet 321 and a cooling liquid outlet 322; the cooling liquid inlet 321 and the cooling liquid outlet 322 are respectively connected to the cooling pipe 320, and the cooling liquid inlet 321 and the cooling liquid outlet 322 are respectively connected to the cooling cavity 330, and the conveying direction of the cooling liquid from the cooling liquid inlet 321 to the cooling liquid outlet 322 is opposite to the conveying direction of the primary compressed air flowing in the conveying pipe 310.

[0045] In this embodiment, sealed ends are formed at both ends of the cooling pipe 320 where they are docked with the first-stage air compression mechanism 200 and the second-stage air compression mechanism 400, so as to ensure that a sealed space is formed in the cooling cavity 330 along the outside of the delivery pipe 310. In order to ensure the flow and delivery of the coolant, a coolant inlet 321 and a coolant outlet 322 are respectively provided at both ends of the cooling pipe 320, and the coolant inlet 321 can be sealed and docked with an external coolant delivery device, and the coolant outlet 322 can be sealed and docked with an external coolant receiving device. The coolant is transported into the cooling cavity 330 by means of the coolant inlet 321. By means of the annular structure of the cooling cavity 330, the coolant can fully exchange heat with the first-stage compressed air. At the same time, the delivery direction of the coolant is opposite to the delivery direction of the first-stage compressed air, thereby ensuring that the coolant can complete heat exchange and cooling with all the first-stage compressed air in the delivery pipe 310.

[0046] In a preferred embodiment of the utility model, the first-stage air compression mechanism 200 includes a first-stage air compression cover 210 and a first connecting pipe 220; the first-stage air compression cover 210 is sealed and connected to the air compressor body 100, and a first-stage compression space 212 is formed between the first-stage air compression cover 210 and the air compressor body 100, the first connecting pipe 220 is connected to the first-stage air compression cover 210, and the first connecting pipe 220 is connected to the first-stage compression space 212, and the other end of the first connecting pipe 220 is sealed and connected to the conveying pipeline 310.

[0047] In this embodiment, the first-stage compressed air cover 210 can be sealed and connected to the end of the air compressor body 100 by means of a flange seal, and the first-stage compressed air cover 210 has a first-stage air inlet 211 at the end away from the air compressor body 100. The first-stage air inlet 211 can be used to suck air from the external environment into the first-stage compression space 212 for absorption and compression. The first-stage compressed air after the first-stage compression will be discharged through the first connecting pipe 220. The port of the first connecting pipe 220 has a first-stage air outlet 222. The first connecting pipe 220 uses the first-stage air outlet 222 to seal and connect with the delivery pipe 310, thereby ensuring the one-way delivery of the first-stage compressed air to the delivery pipe 310.

[0048] In a preferred embodiment of the utility model, a sealing gasket 500 is also included; the end of the first connecting pipe 220 connected to the delivery pipe 310 has a first flange sealing surface 221, and the end of the cooling pipe 320 corresponding to the first flange sealing surface 221 has a second flange sealing surface 323, the sealing gasket 500 is located between the first flange sealing surface 221 and the second flange sealing surface 323, and the first connecting pipe 220 is sealedly connected to the second flange sealing surface 323 of the cooling pipe 320 through the first flange sealing surface 221.

[0049] In this embodiment, the sealing gasket 500 serves as a sealing element between the first-stage air compression mechanism 200 and the cooling mechanism 300. The sealing gasket 500 can clamp and seal on the first flange sealing surface 221 and the second flange sealing surface 323, and a sealing rib 510 is provided at the position of the sealing gasket 500 corresponding to the cooling cavity 330. The first flange sealing surface 221 and the second flange sealing surface 323 are arranged in a butt-jointed manner and are connected and fixed by tightening bolts.

[0050] In a preferred embodiment of the utility model, the secondary air compression mechanism 400 includes a secondary air compression cover 410 and a second connecting pipe 420; the secondary air compression cover 410 is sealed and connected to the air compressor body 100, and a secondary compression space 411 is formed between the secondary air compression cover 410 and the air compressor body 100, the second connecting pipe 420 is connected to the secondary air compression cover 410, and the second connecting pipe 420 is connected to the secondary compression space 411, and the other end of the second connecting pipe 420 is sealed and connected to the delivery pipeline 310.

[0051] In this embodiment, the secondary air compressor cover 410 can be sealed and connected to the end of the air compressor body 100 by means of a flange seal, and a secondary air outlet 412 is provided on the secondary air compressor cover 410. After the conveying channel conveys the cooled primary compressed air to the secondary compression space 411 through the second connecting pipe 420, the primary compressed air in the secondary compression space 411 is subjected to secondary compression based on the air compressor body 100, and the secondary compressed air after the secondary compression is discharged through the secondary air outlet 412.

[0052] In a preferred embodiment of the utility model, the secondary air compression cover 410, the second connecting pipe 420 and the cooling mechanism 300 are integrally formed; in this embodiment, the secondary air compression cover 410, the second connecting pipe 420 and the cooling mechanism 300 are completed by integral injection molding, that is, the secondary air compression mechanism 400 and the cooling mechanism 300 form an integral structure, which ensures the integrity of the structure, saves assembly, and can also save installation costs.

[0053] In a preferred embodiment of the utility model, the first-stage air compression cover 210 and the first connecting pipe 220 are integrally formed; in this embodiment, the first-stage air compression cover 210 and the first connecting pipe 220 can also be completed by integral injection molding, that is, the overall structure only needs to ensure the sealing installation between the first-stage air compression mechanism 200 and the cooling mechanism 300, which ensures the integrity of the structure, saves assembly, and can also save installation costs.

[0054] In a preferred embodiment of the utility model, the axial direction of the first connecting pipe 220 has an angle with the axial direction of the first-stage compressor cover 210, and the axial direction of the second connecting pipe 420 has an angle with the axial direction of the second-stage compressor cover 410, so that the cooling mechanism 300 is located outside the air compressor body 100.

[0055] In this embodiment, the first connecting tube 220 has a bending angle, that is, after the first connecting tube 220 and the side wall of the first-stage compressed air cover 210 are extended, they can extend out of the external area of ​​the air compressor body 100. At the same time, the second connecting tube 420 has a bending angle, that is, after the second connecting tube 420 and the side wall of the second-stage compressed air cover 410 are extended, they can also extend out of the external area of ​​the air compressor body 100. The cooling mechanism 300 is respectively connected to the first connecting tube 220 and the second connecting tube 420. At this time, the cooling mechanism 300 is located on the outside of the air compressor body 100, which ensures the delivery of the coolant of the cooling mechanism 300 and the delivery and circulation of the first-stage compressed air to the second-stage compressed air, thereby avoiding interference between the cooling mechanism 300 and the air compressor body 100.

[0056] like Figure 7 As shown, in a preferred embodiment of the present invention, the air compressor can be provided in multiple configurations, wherein the compressed air outlet of the secondary air compression mechanism 400 of one air compressor is communicated with the air inlet of the primary air compression mechanism 200 of the adjacent air compressor. Here, the compressed air outlet of the secondary air compression mechanism 400 of one air compressor can be communicated with the air inlet of the primary air compression mechanism 200 of one or more adjacent air compressors, respectively.

[0057] Specifically, a plurality of air compressor bodies 100, first-stage air compression mechanisms 200, cooling mechanisms 300 and second-stage air compression mechanisms 400 are provided, and each of the two ends of the air compressor body 100 is respectively connected to a first-stage air compression mechanism 200 and a second-stage air compression mechanism 400, and the cooling mechanism 300 is respectively connected to the first-stage air compression mechanism 200 and the second-stage air compression mechanism 400, and one of the second-stage air compressor mechanisms 400 can be connected to the adjacent first-stage air compressor mechanism 200.

[0058] In this embodiment, each air compressor body 100 forms an integral structure with the first-stage air compression mechanism 200, the second-stage air compression mechanism 400 and the cooling mechanism 300. By providing multiple of the above-mentioned integral structures, multiple integral structures are connected in series through connecting pipes, that is, each air compressor body 100 can complete two-stage compression and cooling, thereby realizing multi-stage compression of the air.

[0059] A fuel cell system provided in this embodiment includes the air compressor for the fuel cell system; since the technical effect of the fuel cell system provided in this embodiment is the same as the technical effect of the air compressor for the fuel cell system provided in the above embodiment, it will not be repeated here.

[0060] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. An air compressor for a fuel cell system, characterized in that: include: An air compressor body (100), a first-stage air compression mechanism (200), a cooling mechanism (300) and a second-stage air compression mechanism (400); The first-stage air compression mechanism (200) and the second-stage air compression mechanism (400) are respectively located at two ends of the air compressor body (100), and the first-stage air compression mechanism (200) and the second-stage air compression mechanism (400) are respectively connected to the air compressor body (100), and the cooling mechanism (300) is located outside the air compressor body (100) and is in line contact with the air compressor body (100); The first-stage air compression mechanism (200) is connected to the second-stage air compression mechanism (400) through the cooling mechanism (300); the first-stage air compression mechanism (200) forms first-stage compressed air based on the air compressor body (100); and the first-stage air compression mechanism (200) transports the first-stage compressed air to the second-stage air compression mechanism (400) through the cooling mechanism (300); the cooling mechanism (300) is used to cool the first-stage compressed air; and the second-stage air compression mechanism (400) forms second-stage compressed air based on the air compressor body (100) and discharges the cooled first-stage compressed air; The cooling mechanism (300) comprises a conveying pipeline (310) and a cooling pipeline (320), and the conveying pipeline (310) and the cooling pipeline (320) are both cylindrical; The cooling pipe (320) is sleeved on the outside of the conveying pipe (310), and a cooling cavity (330) is formed between the cooling pipe (320) and the conveying pipe (310). The two ends of the conveying pipe (310) are respectively connected to the first-stage air compression mechanism (200) and the second-stage air compression mechanism (400). The cooling cavity (330) is used for flowing cooling liquid, and the cooling cavity (330) cools the first-stage compressed air flowing in the conveying pipe (310) through the cooling liquid.

2. The air compressor for a fuel cell system according to claim 1, characterized in that: The cooling mechanism (300) further comprises a cooling liquid inlet (321) and a cooling liquid outlet (322); The cooling liquid inlet (321) and the cooling liquid outlet (322) are respectively connected to the cooling pipe (320), and the cooling liquid inlet (321) and the cooling liquid outlet (322) are respectively communicated with the cooling cavity (330), and the conveying direction of the cooling liquid from the cooling liquid inlet (321) to the cooling liquid outlet (322) is opposite to the conveying direction of the primary compressed air flowing in the conveying pipe (310).

3. The air compressor for a fuel cell system according to claim 1, characterized in that: The first-stage air compression mechanism (200) comprises a first-stage air compression cover (210) and a first connecting pipe (220); The first-stage air pressure cover (210) is sealed and connected to the air compressor body (100), and a first-stage compression space (212) is formed between the first-stage air pressure cover (210) and the air compressor body (100); the first connecting pipe (220) is connected to the first-stage air pressure cover (210), and the first connecting pipe (220) is connected to the first-stage compression space (212); the other end of the first connecting pipe (220) is sealed and connected to the delivery pipeline (310).

4. The air compressor for a fuel cell system according to claim 3, characterized in that: Also includes a sealing gasket (500); One end of the first connecting pipe (220) connected to the delivery pipe (310) has a first flange sealing surface (221), and one end of the cooling pipe (320) corresponding to the first flange sealing surface (221) has a second flange sealing surface (323), the sealing gasket (500) is located between the first flange sealing surface (221) and the second flange sealing surface (323), and the first connecting pipe (220) is butt-sealedly connected to the second flange sealing surface (323) of the cooling pipe (320) via the first flange sealing surface (221).

5. The air compressor for a fuel cell system according to claim 3, characterized in that: The secondary air compression mechanism (400) comprises a secondary air compression cover (410) and a second connecting pipe (420); The secondary air compression cover (410) is sealedly connected to the air compressor body (100), and a secondary compression space (411) is formed between the secondary air compression cover (410) and the air compressor body (100); the second connecting pipe (420) is connected to the secondary air compression cover (410), and the second connecting pipe (420) is connected to the secondary compression space (411); the other end of the second connecting pipe (420) is sealedly connected to the delivery pipeline (310).

6. The air compressor for a fuel cell system according to claim 5, characterized in that: The secondary air pressure cover (410), the second connecting pipe (420) and the cooling mechanism (300) are integrally formed; And / or, the first-stage compressed air cover (210) and the first connecting pipe (220) are integrally formed.

7. The air compressor for a fuel cell system according to claim 5, characterized in that: The axial direction of the first connecting pipe (220) forms an angle with the axial direction of the first-stage compressor cover (210), and the axial direction of the second connecting pipe (420) forms an angle with the axial direction of the second-stage compressor cover (410), so that the cooling mechanism (300) is located outside the air compressor body (100).

8. The air compressor for a fuel cell system according to any one of claims 1 to 7, characterized in that: The air compressors are arranged in plurality, wherein the compressed air discharge port of the secondary air compression mechanism (400) of one air compressor is communicated with the air inlet port of the primary air compression mechanism (200) of the adjacent air compressor.

9. A fuel cell system, characterized in that: It comprises an air compressor for a fuel cell system as described in any one of claims 1 to 8.

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