Fuel cell engine cooling system

Abstract

The utility model relates to the technical field of fuel cell systems, and discloses a fuel cell engine cooling system which comprises an electric pile, a main radiator, an auxiliary box body, a four-way valve, a pump body and a stop valve, the electric pile is provided with a first inlet and a first outlet, the four-way valve is provided with a first port, a second port, a third port and a fourth port, and the main radiator is provided with a second inlet and a second outlet; the first opening is communicated with the second outlet, a pump body is arranged between the second opening and the first inlet, one end of the stop valve is communicated with the third opening, the other end of the stop valve is communicated with the third opening and the second inlet, the third opening and the second inlet are arranged in parallel, and the pump body is arranged between the second opening and the second inlet. And the fourth opening is communicated with the liquid outlet of the auxiliary box body. The engine cooling system has the advantages that the structure of the cooling system is simplified, cold and hot start control delay is shortened, the cooling system can respond quickly, and the working efficiency of an engine is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of fuel cell systems, in particular to a cooling system for a fuel cell engine. Background Art

[0002] A fuel cell is a device that directly converts chemical energy into electrical energy. Due to its advantages such as high efficiency, low noise, low starting temperature, and zero pollution, it is widely used in fields such as stationary power generation, transportation, and portable power sources. A fuel cell engine uses a fuel cell as power to replace the traditional internal combustion engine power. Not only is the driving efficiency significantly improved, but also the stability and reliability are high, and the emissions can truly reach zero pollution. According to relevant data statistics, compared with traditional internal combustion engines, fuel cell engines reduce oil resource consumption by 60%, carbon dioxide emissions by 75%, and toxic substance emissions by 99%. Therefore, fuel cell electric vehicles are generally considered to be the most effective way to solve urban motor vehicle exhaust pollution.

[0003] The cooling system of a fuel cell engine is an important subsystem of the fuel cell engine system. The quality of the cooling system determines the power generation efficiency and life of the fuel cell stack. Due to the influence of the ambient temperature when the vehicle starts, when the ambient temperature is high, it is a hot start, and the fuel cell stack needs to dissipate heat quickly. When the ambient temperature is low, it is a cold start, and the temperature of the fuel cell stack needs to be quickly increased. The existing cooling system of a fuel cell engine has a relatively complex structure, and when performing cold and hot starts, the control delay is relatively long, which is not conducive to the quick response of the cooling system and affects the working efficiency of the engine. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a cooling system for a fuel cell engine, which simplifies the structure of the cooling system, reduces the control delay of cold and hot starts, enables the cooling system to respond quickly, and improves the working efficiency of the engine.

[0005] To achieve the above purpose, the utility model provides a cooling system for a fuel cell engine, including a fuel cell stack, a main radiator, an auxiliary box, a four-way valve, a pump body, and a stop valve;

[0006] The fuel cell stack is provided with a first inlet and a first outlet. The four-way valve is provided with a first port, a second port, a third port, and a fourth port. The main radiator is provided with a second inlet and a second outlet;

[0007] The first port is communicated with the second outlet. A pump body is arranged between the second port and the first inlet. One end of the stop valve is communicated with the third port, and the other end is communicated with both the third port and the second inlet. The third port and the second inlet are arranged in parallel. The fourth port is communicated with the liquid outlet of the auxiliary box;

[0008] During hot start-up, the first port, the second port, and the fourth port are opened, and the third port is closed. The coolant forms a first circulation loop by flowing from the auxiliary tank body through the fourth port, the second port, the pump body, the first inlet, the first outlet, the stop valve, the second inlet, and the second outlet back to the first port. During cold start-up, the second port, the third port, and the fourth port are opened, and the first port is closed. The coolant forms a second circulation loop by flowing from the auxiliary tank body through the fourth port, the second port, the pump body, the first inlet, the first outlet, and the stop valve back to the third port.

[0009] Furthermore, an integrated flange is provided between the pump body and the four-way valve. The pump body and the integrated flange are fixedly arranged. The liquid inlet of the pump body is communicated with the second port, and the liquid outlet of the pump body is communicated with the first inlet.

[0010] Furthermore, sleeves are provided at the ends of the first port, the third port, and the fourth port. A clamp is sleeved outside the sleeve, and an elastic lining is provided inside the clamp. The elastic lining is arranged between the inner wall and the outer wall of the clamp.

[0011] Furthermore, the elastic lining includes an arc-shaped piece and a spring piece. At both ends of the arc-shaped piece, first buckles for clamping with the clamp are provided along the two side walls in the axial direction. In the middle of the arc-shaped piece, second buckles for clamping with the spring piece are provided along the two side walls in the axial direction.

[0012] Furthermore, the spring piece includes a connecting portion and an arc-shaped arched portion. The connecting portion is clamped with the second buckle. The arc-shaped arched portions are provided at both ends of the connecting portion, and the openings of the arc-shaped arched portions face the arc-shaped piece.

[0013] Furthermore, a filter joint is provided at the end of the sleeve connected to the first port, and the other end of the filter joint is connected to the second outlet.

[0014] Furthermore, a connecting plate is fixedly provided at the bottom of the pump body, and mounting holes are provided in the connecting plate.

[0015] Furthermore, a temperature sensor is provided at the first outlet.

[0016] Compared with the prior art, the beneficial effects of the fuel cell engine cooling system according to the embodiment of the present utility model are as follows: It includes a stack, a main radiator, an auxiliary box, a four-way valve, a pump body, and a stop valve; the stack is provided with a first inlet and a first outlet, the four-way valve is provided with a first port, a second port, a third port, and a fourth port, and the main radiator is provided with a second inlet and a second outlet; during hot start, the first port, the second port, and the fourth port are opened, and the third port is closed. The coolant flows from the auxiliary box through the fourth port, the second port, the pump body, the first inlet, the first outlet, the stop valve, the second inlet, and the second outlet and returns to the first port to form a first circulation loop, quickly dissipating heat from the stack; during cold start, the second port, the third port, and the fourth port are opened, and the first port is closed. The coolant flows from the auxiliary box through the fourth port, the second port, the pump body, the first inlet, the first outlet, and the stop valve and returns to the third port to form a second circulation loop, quickly increasing the temperature of the stack. The overall structure is simple, the structure of the cooling system is simplified, the control delay is reduced, which is conducive to the rapid response of the cooling system and improves the working efficiency of the engine. Description of the Drawings

[0017] Figure 1 is the structural schematic diagram of the fuel cell engine cooling system according to the embodiment of the present utility model;

[0018] Figure 2 is the assembly schematic diagram of the four-way valve of the fuel cell engine cooling system according to the embodiment of the present utility model;

[0019] Figure 3 is the structural schematic diagram of the clamp of the fuel cell engine cooling system according to the embodiment of the present utility model;

[0020] Figure 4 is the structural schematic diagram of the elastic lining of the fuel cell engine cooling system according to the embodiment of the present utility model.

[0021] In the figure, 1, stack; 100, first inlet; 101, first outlet; 2, main radiator; 21, second inlet; 22, second outlet; 3, auxiliary box; 4, four-way valve; 41, first port; 42, second port; 43, third port; 44, fourth port; 5, pump body; 51, connecting plate; 6, stop valve; 7, first circulation loop; 8, second circulation loop; 9, integrated flange; 10, sleeve; 11, clamp; 12, elastic lining; 121, arc-shaped piece; 1211, first buckle; 1212, second buckle; 122, elastic piece; 1221, connecting part; 1222, arc-shaped arched part; 13, filter screen joint; 14, temperature sensor. Detailed Embodiments

[0022] The following combines the drawings and embodiments to further describe in detail the specific embodiments of the present utility model. The following embodiments are used to illustrate the present utility model, but are not used to limit the scope of the present utility model.

[0023] In the description of the present utility model, it should be understood that the orientation or positional relationship indicated by terms such as "upper", "lower", "front", "rear", "inner", "outer", etc. in the present utility model is based on the positional relationship shown in the drawings. It is only for the convenience of describing the present utility model and simplifying the description, rather than indicating or implying that the devices and elements referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be construed as a limitation to the present utility model.

[0024] In the description of the present utility model, it should be understood that terms such as "first" and "second" are used to describe various information in the present utility model, but such information should not be limited to these terms, and these terms are only used to distinguish the same type of information from each other. For example, without departing from the scope of the present utility model, "first" information may also be referred to as "second" information, and similarly, "second" information may also be referred to as "first" information.

[0025] As Figure 1 shown, a fuel cell engine cooling system according to a preferred embodiment of the present utility model includes a fuel cell stack 1, a main radiator 2, an auxiliary box 3, a four-way valve 4, a pump body 5, and a stop valve 6. Among them, the fuel cell stack 1 is provided with a first inlet 100 and a first outlet 101, the four-way valve 4 is provided with a first port 41, a second port 42, a third port 43, and a fourth port 44, and the main radiator 2 is provided with a second inlet 21 and a second outlet 22. Specifically, the first port 41 is communicated with the second outlet 22, a pump body 5 is provided between the second port 42 and the first inlet 100 for conveying the coolant in the box to the fuel cell stack 1, one end of the stop valve 6 is communicated with the third port 43, and the other end is communicated with the third port 43 and the second inlet 21, and the third port 43 and the second inlet 21 are arranged in parallel, and the fourth port 44 is communicated with the liquid outlet of the auxiliary box 3, and the auxiliary box 3 is filled with coolant. In order to facilitate the control of the cooling system, the cooling system has two working modes. When starting hot, the first port 41, the second port 42, and the fourth port 44 are opened, and the third port 43 is closed. The coolant flows from the auxiliary box 3 through the fourth port 44, the second port 42, the pump body 5, the first inlet 100, the first outlet 101, the stop valve 6, the second inlet 21, and the second outlet 22 and returns to the first port 41 to form a first circulation loop 7. At this time, the coolant dissipates heat from the fuel cell stack 1 through the main radiator 2 quickly. When starting cold, the second port 42, the third port 43, and the fourth port 44 are opened, and the first port 41 is closed. The coolant flows from the auxiliary box 3 through the fourth port 44, the second port 42, the pump body 5, the first inlet 100, the first outlet 101, and the stop valve 6 and returns to the third port 43 to form a second circulation loop 8. At this time, the coolant does not pass through the main radiator 2, and the temperature of the fuel cell stack 1 is quickly increased. When the cooling system stops, at this time, the second port 42 and the stop valve 6 are closed, and a circulation loop cannot be formed in the fuel cell stack 1.

[0026] Furthermore, in order to facilitate reducing the assembly difficulty between the pump body 5 and the four-way valve 4, reducing the volume, and improving the integration degree of the cooling system, refer to Figure 2 , an integrated flange 9 is provided between the pump body 5 and the four-way valve 4. The pump body 5 and the integrated flange 9 are fixedly arranged. The liquid inlet of the pump body 5 is communicated with the second port 42, and the liquid outlet of the pump body 5 is communicated with the first inlet 100. Integrally installing the pump body 5 and the four-way valve 4 can reduce the overall volume of the cooling system and improve the integration degree. Further, in order to facilitate fixing the pump body 5 and the four-way valve 4 as a whole, a connecting plate 51 is fixedly provided at the bottom of the pump body 5. Mounting holes are provided on the connecting plate 51, and the pump body 5 can be fixed by screws.

[0027] Further, in order to facilitate the quick connection between the first port 41, the third port 43, and the fourth port 44 and other components in the cooling system, refer to Figure 2 , sleeves 10 are provided at the ends of the first port 41, the third port 43, and the fourth port 44. The sleeves 10 are generally made of flexible hoses, and the tubing path of the sleeves 10 can be adjusted according to the actual pipeline layout to avoid bending. Further, in order to facilitate fixing the sleeves 10 to each port and prevent liquid leakage, refer to Figure 2 , Figure 3 , a clamp 11 is sleeved outside the sleeve 10, and an elastic lining 12 is provided inside the clamp 11. The elastic lining 12 is arranged between the inner wall and the outer wall of the clamp 11.

[0028] Specifically, refer to Figure 4 , the elastic lining 12 includes an arc-shaped piece 121 and a spring piece 122. Among them, in order to facilitate connection with the clamp 11, first buckles 1211 for clamping with the clamp 11 are provided on both side walls along the axial direction at both ends of the arc-shaped piece 121. Similarly, in order to facilitate connecting the spring piece 122 with the arc-shaped piece 121, second buckles 1212 for clamping with the spring piece 122 are provided on both side walls along the axial direction in the middle of the arc-shaped piece 121. During the process of tightening the clamp 11, the spring piece 122 can undergo elastic deformation. In order to facilitate the design of the spring piece 122, in this embodiment, the spring piece 122 includes a connecting portion 1221 and an arc-shaped arched portion 1222. The connecting portion 1221 is clamped with the second buckle 1212, and arc-shaped arched portions 1222 are provided at both ends of the connecting portion 1221. The openings of the arc-shaped arched portions 1222 face the arc-shaped piece 121.

[0029] Further, in the first circulation loop 7, in order to prevent impurities from entering the fuel cell stack 1 when the coolant in the main radiator 2 directly flows back to the fuel cell stack 1, affecting the heat dissipation effect of the fuel cell stack 1, a filter joint 13 is provided at the end of the sleeve 10 connected to the first port 41. The other end of the filter joint 13 is connected to the second outlet 22, and is used for filtering the coolant flowing out from the second outlet 22.

[0030] Furthermore, in order to facilitate the control of the temperature during the heat dissipation process of the fuel cell stack 1, a temperature sensor 14 is provided at the first outlet 101. That is, when the temperature at the first outlet 101 is greater than the preset temperature, the coolant in the cooling system flows according to the first circulation loop 7. When the temperature at the first outlet 101 is less than the preset temperature, the coolant in the cooling system flows according to the second circulation path.

[0031] In summary, the embodiment of the present utility model provides a fuel cell engine cooling system, including a fuel cell stack 1, a main radiator 2, an auxiliary box 3, a four-way valve 4, a pump body 5 and a stop valve 6; the fuel cell stack 1 is provided with a first inlet 100 and a first outlet 101, the four-way valve 4 is provided with a first port 41, a second port 42, a third port 43 and a fourth port 44, and the main radiator 2 is provided with a second inlet 21 and a second outlet 22; during hot start, the first port 41, the second port 42 and the fourth port 44 are opened, the third port 43 is closed, and the coolant flows from the auxiliary box 3 through the fourth port 44, the second port 42, the pump body 5, the first inlet 100, the first outlet 101, the stop valve 6, the second inlet 21, the second outlet 22 and back to the first port 41 to form a first circulation loop 7 for quickly dissipating heat from the fuel cell stack 1; during cold start, the second port 42, the third port 43 and the fourth port 44 are opened, the first port 41 is closed, and the coolant flows from the auxiliary box 3 through the fourth port 44, the second port 42, the pump body 5, the first inlet 100, the first outlet 101, the stop valve 6 and back to the third port 43 to form a second circulation loop 8 for quickly increasing the temperature of the fuel cell stack 1. The overall structure is simple, the structure of the cooling system is simplified, the control delay is reduced, which is beneficial to the quick response of the cooling system and improves the working efficiency of the engine.

[0032] The above are only the preferred embodiments of the present utility model. It should be noted that for those of ordinary skill in the art, without departing from the technical principle of the present utility model, several improvements and replacements can be made, and these improvements and replacements should also be regarded as the protection scope of the present utility model.

Claims

1. A fuel cell engine cooling system, characterized in that: It includes a stack, a main radiator, an auxiliary box body, a four-way valve, a pump body and a stop valve; The stack is provided with a first inlet and a first outlet, the four-way valve is provided with a first port, a second port, a third port and a fourth port, and the main radiator is provided with a second inlet and a second outlet; The first port is communicated with the second outlet, a pump body is arranged between the second port and the first inlet, one end of the stop valve is communicated with the third port, and the other end is communicated with the third port and the second inlet. The third port and the second inlet are arranged in parallel, and the fourth port is communicated with the liquid outlet of the auxiliary box body; Wherein, during hot start, the first port, the second port and the fourth port are opened, and the third port is closed. The coolant flows from the auxiliary box body through the fourth port, the second port, the pump body, the first inlet, the first outlet, the stop valve, the second inlet and the second outlet in sequence and then returns to the first port to form a first circulation loop; during cold start, the second port, the third port and the fourth port are opened, and the first port is closed. The coolant flows from the auxiliary box body through the fourth port, the second port, the pump body, the first inlet, the first outlet and the stop valve in sequence and then returns to the third port to form a second circulation loop.

2. The fuel cell engine cooling system according to claim 1, characterized in that: An integrated flange is arranged between the pump body and the four-way valve. The pump body and the integrated flange are fixedly arranged. The liquid inlet of the pump body is communicated with the second port, and the liquid outlet of the pump body is communicated with the first inlet.

3. The fuel cell engine cooling system according to claim 1, characterized in that: Sleeves are arranged at the ends of the first port, the third port and the fourth port. A clamp is sleeved outside the sleeve, and an elastic lining is arranged inside the clamp. The elastic lining is arranged between the inner wall and the outer wall of the clamp.

4. The fuel cell engine cooling system according to claim 3, wherein: The elastic lining includes an arc-shaped piece and a spring piece. First buckles for clamping with the clamp are arranged on the two side walls along the axial direction at both ends of the arc-shaped piece, and second buckles for clamping with the spring piece are arranged on the two side walls along the axial direction in the middle of the arc-shaped piece.

5. The fuel cell engine cooling system according to claim 4, wherein: The spring piece includes a connecting part and an arc-shaped arched part. The connecting part is clamped with the second buckle. The arc-shaped arched parts are arranged at both ends of the connecting part, and the openings of the arc-shaped arched parts face the arc-shaped piece.

6. The fuel cell engine cooling system according to claim 3, wherein: A filter screen joint is arranged at the end of the sleeve connected to the first port, and the other end of the filter screen joint is connected to the second outlet.

7. The fuel cell engine cooling system according to claim 1, wherein: A connecting plate is fixedly arranged at the bottom of the pump body, and mounting holes are formed in the connecting plate.

8. The fuel cell engine cooling system according to claim 1, wherein: A temperature sensor is arranged at the first outlet.

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