A heat dissipation structure of a fuel cell sprinkler truck power system

Abstract

The present invention discloses a heat dissipation structure of a power system of a fuel cell sprinkler truck, comprising a car body, a water tank is arranged at the upper right end of the car body, a left end of the water tank is connected to a water pump through a water pipe, the left end of the heat exchanger structure is connected to the fuel cell system, the upper end of the fuel cell system is connected to the vehicle-mounted hydrogen storage system, the fuel cell system comprises a radiator, a water tank, a second water pump, a thermostat, a valve, and a fuel cell stack, the water tank, the water pump, and the heat exchanger structure together constitute a main cooling circuit, the radiator, the water tank, the second water pump, the thermostat, and the valve one constitute a cooling circuit of the fuel cell stack, the water stored in the water tank of the sprinkler truck is used to provide a cold source for the fuel cell power system, and the fuel cell stack and auxiliary components are cooled at the same time, the parasitic power generated by the thermal management subsystem is reduced, and the energy efficiency of the fuel cell sprinkler truck is improved.

Description

Technical Field

[0001] The invention belongs to the technical field of fuel cell vehicles, and in particular relates to a heat dissipation structure of a power system of a fuel cell sprinkler truck. Background Art

[0002] Applying fuel cell systems as the main power source to automobiles can give full play to the advantages of fuel cells such as high efficiency, cleanliness and pollution-free operation, and is expected to replace traditional fuel vehicles to solve the problems of carbon emissions and air pollution in the transportation field. Municipal sanitation sprinkler trucks are mainly used to wash urban roads, trees, green belts and other areas. They have relatively fixed routes and are one of the main fuel cell models promoted at this stage.

[0003] In existing automotive fuel cell systems, water cooling is mainly used to cool the stack and auxiliary components, and the excess heat is transferred to the air through the radiator. During vehicle driving, the control system needs to adjust the radiator fan speed and coolant pump speed according to the temperature of each component of the fuel cell power system, and maintain the temperature of each working component by changing the wind speed and coolant circulation speed. The energy consumed by the radiator fan and the coolant pump needs to be provided by the fuel cell stack, which reduces the output power of the fuel cell system. Therefore, under the premise of ensuring the heat dissipation capacity, it is an urgent problem to reduce the parasitic power of the fuel cell system caused by the thermal management system and improve the energy utilization efficiency of fuel cell vehicles. Summary of the invention

[0004] The purpose of the present invention is to provide a heat dissipation structure for a power system of a fuel cell sprinkler truck in order to solve the above-mentioned problems.

[0005] The technical solution adopted by the present invention is as follows: a heat dissipation structure of a fuel cell sprinkler truck power system, including a car body, a water tank is arranged on the upper right end of the car body, a left end of the water tank is connected to a water pump through a water pipe, one end of the water pump is connected to a heat exchanger structure through a connecting pipe, the left end of the heat exchanger structure is connected to the fuel cell system, and the upper end of the fuel cell system is connected to a vehicle-mounted hydrogen storage system. The fuel cell system includes a radiator, a water tank, a second water pump, a thermostat, a valve one and a fuel cell stack. The water tank, the water pump and the heat exchanger structure together constitute a main cooling circuit, and the radiator, the water tank, the second water pump, the thermostat and the valve one constitute a cooling circuit of the fuel cell stack.

[0006] In a preferred embodiment, a cooling fan is provided on the radiator, a flow channel on one side of the heat exchanger structure is connected in series with a cooling water circulation of the fuel cell system, and a flow channel on the other side of the heat exchanger structure is connected to a water pump.

[0007] In a preferred embodiment, the internal cooling water of the fuel cell system is separated from the water in the water tank by the heat exchanger structure, and the fuel cell system also includes a second radiator, a second water tank, a third water pump, a second thermostat and a second valve.

[0008] In a preferred embodiment, the auxiliary components in the fuel cell system mainly include a DC / DC converter, an air compressor and a motor, and the radiator 2, the water tank 2, the water pump 3, the thermostat 2 and the valve 2 constitute a cooling circuit for the auxiliary components of the fuel cell system.

[0009] In a preferred embodiment, one end of the second valve is connected to the second heat exchanger structure, and the second heat exchanger structure is connected in series with the heat exchanger structure.

[0010] In a preferred embodiment, the heat exchanger structure 2 and the heat exchanger structure can provide a cold source for auxiliary components of the fuel cell system and the fuel cell stack.

[0011] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0012] 1. In the present invention, the water in the water tank of the sprinkler truck is used to provide a cold source for the fuel cell system, which can effectively reduce the heat dissipation power consumption of the fuel cell system, improve the energy efficiency of the fuel cell system, and extend the driving time of the fuel cell sprinkler truck.

[0013] 2. In the present invention, multiple heat exchangers can be connected in series and can be flexibly adjusted according to the heating power of each component of the fuel cell system for a sprinkler truck. BRIEF DESCRIPTION OF THE DRAWINGS

[0014] Figure 1 It is a schematic diagram of the overall structure of the present invention;

[0015] Figure 2 A system topology diagram for heat dissipation of a fuel cell stack only according to the present invention;

[0016] Figure 3 A system topology diagram showing the heat exchanger of the present invention for dissipating heat for a fuel cell stack and auxiliary components at the same time.

[0017] Markings in the figure: 1-water tank, 2-water pump, 3-heat exchanger structure, 4-radiator, 5-water tank, 6-fuel cell stack, 7-water pump 2, 8-thermostat, 9-valve 1, 10-radiator 2, 11-water tank 2, 12-DC / DC converter, 13-air compressor, 14-motor, 15-water pump 3, 16-thermostat 2, 17-valve 2, 18-heat exchanger structure 2. DETAILED DESCRIPTION

[0018] The present invention is further described in detail below in conjunction with specific embodiments so that those skilled in the art can understand the present invention more clearly.

[0019] The following examples are only used to illustrate the present invention but are not intended to limit the scope of the present invention.

[0020] Unless otherwise specified, the technical means used in the embodiments of the present invention are conventional means well known to those skilled in the art.

[0021] Embodiment 1:

[0022] Reference Figure 1 and 2 A heat dissipation structure of a fuel cell sprinkler truck power system includes a car body 19, a water tank 1 is arranged on the upper right end of the car body 19, a left end of the water tank 1 is connected to a water pump 2 through a water pipe, one end of the water pump 2 is connected to a heat exchanger structure 3 through a connecting pipe, the left end of the heat exchanger structure 3 is connected to a fuel cell system 20, and the upper end of the fuel cell system 20 is connected to a vehicle-mounted hydrogen storage system 21, the fuel cell system 20 includes a radiator 4, a water tank 5, a water pump 2 7, a thermostat 8, a valve 1 9 and a fuel cell stack 6, the water tank 1, the water pump 2, and the heat exchanger structure 3 together constitute a main cooling circuit, and the radiator 4, the water tank 5, the water pump 2 7, the thermostat 8, and the valve 1 9 constitute a cooling circuit of the fuel cell stack 6.

[0023] In this embodiment, a cooling fan is provided on the radiator 4, a flow channel on one side of the heat exchanger structure 3 is connected in series with the cooling water circulation of the fuel cell system 20, and a flow channel on the other side of the heat exchanger structure 3 is connected to a water pump.

[0024] In this embodiment, the internal cooling water of the fuel cell system 20 is separated from the water in the water tank 1 by the heat exchanger structure 3. The fuel cell system 20 also includes a radiator 10, a water tank 11, a water pump 15, a thermostat 16 and a valve 17.

[0025] In this embodiment, the auxiliary components in the fuel cell system 20 mainly include a DC / DC converter 12, an air compressor 13 and a motor 14, and a radiator 10, a water tank 11, a water pump 15, a thermostat 16 and a valve 17 constitute a cooling circuit for the auxiliary components of the fuel cell system.

[0026] When the fuel cell sprinkler truck starts, the power system temperature is low, the thermostat main valve is closed, and the coolant returns directly to the water tank after passing through the water pump. At this time, the coolant does not pass through the cooling circuit, the power system dissipates less heat and heats up faster. The coolant flowing out of water pump 2 7 passes through thermostat 8 and returns to water tank 5 from cooling circuit 1.1. The coolant flowing out of water pump 3 15 passes through thermostat 2 16 and returns to water tank 2 11 from cooling circuit 2.1.

[0027] As the fuel cell sprinkler truck power system continues to operate, the system temperature continues to rise. When the temperature of the coolant flowing out of the water pump 2 7 reaches a threshold value (80°C) or above, the main valve of the thermostat 8 is started, the cooling circuit 1.1 is closed, and the coolant enters the cooling circuit 1.3 after passing through the thermostat 8, and exchanges heat with the water in the cooling main circuit in the heat exchanger structure 3. At the same time, the water pump 2 is started, and the water stored in the water tank 1 is extracted and injected into the heat exchanger structure 3, and the heat is exchanged with the coolant in the cooling circuit 1.3. At this time, the sufficient amount of water in the water tank 1 can produce a good heat dissipation effect, and the radiator 4 is not needed, and the valve 1 9 is in a closed state.

[0028] When the fuel cell watering truck is working, it continuously sprays water from the water tank 1, and the heat dissipation effect of the cooling main circuit gradually weakens. When the temperature of the coolant flowing out of the water pump 2 7 rises to above 85°C, the valve 9 starts, and part of the coolant flows through the cooling circuit 1.2, and dissipates heat into the air in the radiator 4. At the same time, the fan of the radiator 4 starts to increase the heat dissipation capacity of the radiator 4 and keep the temperature of the fuel cell stack stable.

[0029] When the temperature of the coolant flowing out of the water pump 3 15 reaches a threshold value (80°C) or above, the main valve of the thermostat 2 16 is activated and the cooling circuit 2.1 is closed. The coolant passes through the thermostat 2 16 and enters the cooling circuit 2.2, where the heat is dissipated to the air in the radiator 2 10. When the coolant temperature further rises to above 85°C, the fan of the radiator 2 10 is activated to increase the heat dissipation capacity of the radiator 2 10 and maintain the temperature of the auxiliary components of the fuel cell system stable.

[0030] When the fuel cell water truck is idling or running at low speed, the power system generates less heat and the system temperature gradually decreases. When the temperature of the coolant flowing out of the water pump 2 7 is lower than the threshold value (80°C), the valve 1 9 is closed, and the coolant only passes through the cooling circuit 1.3 and exchanges heat with the water in the main cooling circuit in the heat exchanger structure 3. When the coolant temperature further drops below 70°C, the main valve of the thermostat 8 is closed, and the coolant returns to the water tank 5 after passing through the cooling circuit 1.1. At the same time, the water pump 2 is turned off and the main cooling circuit is closed.

[0031] When the temperature of the coolant flowing out of the water pump 3 15 is lower than the threshold value (80°C), the fan of the radiator 2 10 is turned off to reduce the heat dissipation. When the coolant temperature further drops below 70°C, the main valve of the thermostat 2 16 is closed, and the coolant returns to the water tank 2 11 after passing through the cooling circuit 2.1.

[0032] Embodiment 2:

[0033] Reference Figure 1 and 3In the present embodiment, a heat dissipation structure of a power system of a fuel cell sprinkler truck includes a vehicle body 19, a water tank 1 is provided at the upper right end of the vehicle body 19, a left end of the water tank 1 is connected to a water pump 2 through a water pipe, one end of the water pump 2 is connected to a heat exchanger structure 3 through a connecting pipe, the left end of the heat exchanger structure 3 is connected to a fuel cell system 20, and the upper end of the fuel cell system 20 is connected to a vehicle-mounted hydrogen storage system 21, the fuel cell system 20 includes a radiator 4, a water tank 5, a water pump 2 7, a thermostat 8, a valve 1 9 and a fuel cell stack 6, the water tank 1, the water pump 2, and the heat exchanger structure 3 together constitute a main cooling circuit, and the radiator 4, the water tank 5, the water pump 2 7, the thermostat 8, and the valve 1 9 constitute a cooling circuit of the fuel cell stack 6.

[0034] In this embodiment, a cooling fan is provided on the radiator 4, a flow channel on one side of the heat exchanger structure 3 is connected in series with the cooling water circulation of the fuel cell system 20, and a flow channel on the other side of the heat exchanger structure 3 is connected to a water pump.

[0035] In this embodiment, the internal cooling water of the fuel cell system 20 is separated from the water in the water tank 1 by the heat exchanger structure 3. The fuel cell system 20 also includes a radiator 10, a water tank 11, a water pump 15, a thermostat 16 and a valve 17.

[0036] In this embodiment, the auxiliary components in the fuel cell system 20 mainly include a DC / DC converter 12, an air compressor 13 and a motor 14, and a radiator 10, a water tank 11, a water pump 15, a thermostat 16 and a valve 17 constitute a cooling circuit for the auxiliary components of the fuel cell system.

[0037] In this embodiment, one end of the second valve 17 is connected to the second heat exchanger structure 18 , and the second heat exchanger structure 18 is connected in series with the heat exchanger structure 3 .

[0038] In this embodiment, the heat exchanger structure 2 18 and the heat exchanger structure 3 can provide a cold source for auxiliary components of the fuel cell system and the fuel cell stack 6 .

[0039] When the fuel cell water truck starts: the power system temperature is low, the thermostat main valve is closed, and the coolant returns directly to the water tank after passing through the water pump. At this time, the coolant does not pass through the cooling circuit, the power system dissipates less heat and heats up faster. The coolant flowing out of the water pump 2 7 passes through the thermostat 8 and returns to the water tank 5 from the cooling circuit 1.1. The coolant flowing out of the water pump 3 15 passes through the thermostat 2 16 and returns to the water tank 2 11 from the cooling circuit 2.1.

[0040] As the fuel cell sprinkler truck power system continues to operate, the system temperature continues to rise. When any thermostat main valve in the system is started, the water pump 2 needs to be started at the same time to supply the water stored in the water tank 1 to the heat exchanger.

[0041] When the temperature of the coolant flowing out of the water pump 2 7 reaches a threshold value (80°C) or above, the main valve of the thermostat 8 is activated and the cooling circuit 1.1 is closed. The coolant enters the cooling circuit 1.3 after passing through the thermostat 8 and exchanges heat with the water in the cooling main circuit in the heat exchanger structure 3. At this time, the radiator 4 is not needed and the valve 1 9 is in the closed state.

[0042] When the temperature of the coolant flowing out of the water pump 3 15 reaches a threshold value (80°C) or above, the main valve of the thermostat 2 16 is activated and the cooling circuit 2.1 is closed. The coolant passes through the thermostat 2 16 and enters the cooling circuit 2.3, exchanging heat with the water in the cooling main circuit in the heat exchanger 2 18. At this time, the radiator 2 10 is not needed and the valve 2 17 is in the closed state.

[0043] When the fuel cell watering truck is working, it continuously sprays water from the water tank 1, and the heat dissipation effect of the cooling main circuit gradually weakens. When the temperature of the coolant flowing out of the water pump 2 7 rises to above 85°C, the valve 9 starts, and part of the coolant flows through the cooling circuit 1.2, and dissipates heat into the air in the radiator 4. At the same time, the fan of the radiator 4 starts to increase the heat dissipation capacity of the radiator 4 and keep the temperature of the fuel cell stack stable.

[0044] When the temperature of the coolant flowing out of the water pump 3 16 rises to above 85°C, the valve 17 starts, and part of the coolant flows through the cooling circuit 2.2, dissipating the heat into the air in the radiator 2 10. At the same time, the fan of the radiator 2 10 starts, increasing the heat dissipation capacity of the radiator 2 10 and maintaining the temperature of the auxiliary components of the fuel cell system stable.

[0045] When the fuel cell water truck is idling or running at low speed, the power system generates less heat and the system temperature gradually decreases. When the temperature of the coolant flowing out of the water pump 2 7 is lower than the threshold value (80°C), the valve 1 9 is closed, and the coolant only passes through the cooling circuit 1.3 and exchanges heat with the water in the cooling main circuit in the heat exchanger structure 3. When the coolant temperature further drops below 70°C, the main valve of the thermostat 8 is closed, and the coolant returns to the water tank 5 after passing through the cooling circuit 1.1.

[0046] When the temperature of the coolant flowing out of the water pump 3 15 is lower than the threshold value (80°C), the valve 2 17 is closed, and the coolant only passes through the cooling circuit 2.3, exchanging heat with the water in the cooling main circuit in the heat exchanger 2 18. When the coolant temperature further drops below 70°C, the main valve of the thermostat 2 16 is closed, and the coolant returns to the water tank 2 11 after passing through the cooling circuit 2.1.

[0047] When the main valves of thermostat 8 and thermostat 2 16 are closed, water pump 2 is turned off and the main cooling circuit is closed.

[0048] The standard parts used in the present invention can all be purchased from the market, and the special-shaped parts can all be customized according to the description and the drawings.

[0049] Finally, the method of the present invention is only a preferred embodiment and is not intended to limit the protection scope of the present invention. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A heat dissipation structure of a fuel cell sprinkler truck power system, comprising a vehicle body (19), characterized in that: A water tank (1) is provided at the upper right end of the automobile body (19); a water pump (2) is connected to the left end of the water tank (1) via a water pipe; one end of the water pump (2) is connected to a heat exchanger structure (3) via a connecting pipe; the left end of the heat exchanger structure (3) is connected to a fuel cell system (20); the upper end of the fuel cell system (20) is connected to an on-board hydrogen storage system (21); the fuel cell system (20) comprises a radiator (4), a water tank (5), a second water pump (7), a thermostat (8), a first valve (9) and a fuel cell stack (6); the water tank (1), the water pump (2) and the heat exchanger structure (3) together constitute a main cooling circuit; the radiator (4), the water tank (5), the second water pump (7), the thermostat (8) and the first valve (9) constitute a cooling circuit of the fuel cell stack (6); a cooling fan is provided on the radiator (4); the heat exchanger structure (3) ) is connected in series with the cooling water circulation of the fuel cell system (20), the other side flow channel of the heat exchanger structure (3) is connected to the water pump, the internal cooling water of the fuel cell system (20) and the water in the water tank (1) are separated by the heat exchanger structure (3), the fuel cell system (20) also includes a radiator 2 (10), a water tank 2 (11), a water pump 3 (15), a thermostat 2 (16) and a valve 2 (17), the auxiliary components in the fuel cell system (20) mainly include a DC / DC converter (12), an air compressor (13) and a motor (14), the radiator 2 (10), the water tank 2 (11), the water pump 3 (15), the thermostat 2 (16) and the valve 2 (17) constitute a cooling circuit for the auxiliary components of the fuel cell system, one end of the valve 2 (17) is connected to the heat exchanger structure 2 (18), and the heat exchanger structure 2 (18) is connected in series with the heat exchanger structure (3).

2. A heat dissipation structure of a fuel cell sprinkler truck power system as claimed in claim 1, characterized in that: The heat exchanger structure 2 (18) and the heat exchanger structure (3) can provide a cold source for auxiliary components of the fuel cell system and the fuel cell stack (6).

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