阅读说明：本技术 一种矿车用散热系统 (Cooling system for mine car ) 是由 俞鹏程 刘斐 黄华坤 郭宁平 史虎 艾伍轶 刘曦程 张文进 刘猛 刘辉荣 于 2020-03-18 设计创作，主要内容包括：本发明提供一种矿车用散热系统,包括循环散热通道、牵引系统冷却单元、对高温冷却液进行水冷的水冷单元,以及控制和保护散热系统的控制保护单元,所述水冷单元和所述牵引系统冷却单元通过所述循环散热通道串联,所述控制保护单元设于所述水冷单元和牵引系统冷却单元之间。本发明具有散热效率高、整车重量体积小,且组装维护方便等优点。(The invention provides a heat dissipation system for a mine car, which comprises a circulating heat dissipation channel, a traction system cooling unit, a water cooling unit for cooling high-temperature cooling liquid, and a control protection unit for controlling and protecting the heat dissipation system, wherein the water cooling unit and the traction system cooling unit are connected in series through the circulating heat dissipation channel, and the control protection unit is arranged between the water cooling unit and the traction system cooling unit. The invention has the advantages of high heat dissipation efficiency, small whole vehicle weight and volume, convenient assembly and maintenance and the like.)

1. The utility model provides a cooling system for mine car, its characterized in that includes circulation radiating channel, traction system cooling unit, carries out water-cooled water cooling unit to high temperature coolant liquid to and control and protection cooling system's control protection unit, the water cooling unit with traction system cooling unit passes through circulation radiating channel establishes ties, control protection unit locates between water cooling unit and the traction system cooling unit.

2. The heat removal system for mine cars of claim 1, wherein the traction system cooling unit comprises an inverter cooling channel, a wheel motor cooling channel, and a generator cooling channel arranged in parallel, at least one of the inverter cooling channel, the wheel motor cooling channel, and the generator cooling channel being in communication with the water cooling unit.

3. The mine car heat dissipation system of claim 2, wherein the water cooling unit comprises a fluid cooling fan, and the control and protection unit comprises a water pump; the heat dissipation system also comprises a controller, an auxiliary variable unit and a data acquisition assembly for acquiring water temperature, water pressure and water flow at each part of the circulating heat dissipation channel; the controller is respectively connected with the data acquisition assembly and the auxiliary transformer unit, and the auxiliary transformer unit is connected with the fluid cooling fan and the water pump; and the controller sends a control instruction to the auxiliary variable unit according to the detection signal of the data acquisition assembly so as to control the rotating speed of the fluid cooling fan and the water pump.

4. The mine car cooling system of claim 3, wherein the data acquisition assembly includes a first acquisition area for acquiring data from the control unit and a second acquisition area for acquiring data from each cooling channel of the traction system cooling unit, wherein the first acquisition area includes a second flow detector for acquiring water flow to the control protection unit, a first temperature detector for acquiring temperature of the inlet and outlet flows of the control protection unit, and a first pressure detector for acquiring pressure of the inlet and outlet flows of the control protection unit; the second collecting area comprises a second flow detection piece for collecting water flow of each cooling channel, a second temperature detection piece for collecting temperature of inlet water and outlet water of each cooling channel, and a second pressure detection piece for collecting pressure of inlet water and outlet water of each cooling channel.

5. The heat dissipation system for mine cars of any one of claims 1 to 4, wherein the water cooling unit comprises a heat exchanger and a fluid cooling fan, the heat exchanger is disposed on the circulating heat dissipation channel, and an air blowing port of the fluid cooling fan is disposed in correspondence with the heat exchanger.

6. The heat dissipation system for mine cars of claim 5, further comprising a brake resistor cooling unit, wherein the brake resistor cooling unit comprises a resistor box and a resistor cooling fan arranged at an air inlet of the resistor box; the heat exchanger is arranged at the air inlet of the resistor box, and the fluid cooling fan and the resistor cooling fan are the same cooling fan.

7. The heat removal system for mine cars of any one of claims 1 to 4, wherein the control and protection unit comprises a fluid replacement assembly for replacing lost coolant during system operation, and a fluid filling assembly for filling coolant before system operation; the liquid supplementing assembly comprises an expansion water tank and an exhaust component, the expansion water tank is connected with the circulating heat dissipation channel in parallel, and the exhaust component is communicated with the expansion water tank; the liquid injection assembly is communicated with the circulating heat dissipation channel.

8. The heat radiation system for mine cars according to any one of claims 1 to 4, wherein the control and protection unit further comprises a water pump and a check valve for preventing the coolant from reversely striking the water pump, the water pump and the check valve being provided on the circulation heat radiation passage and downstream of the water pump in the flow direction of the coolant.

9. The heat dissipation system for mine cars of any one of claims 1 to 4, wherein the control and protection unit further comprises a filter for filtering impurities in the coolant, the filter being disposed on the circulating heat dissipation channel at the output end of the water cooling unit.

10. The heat dissipation system for mine cars of any one of claims 1 to 4, wherein each of the cooling channels of the water cooling unit, the control and protection unit and the traction system cooling unit is provided with an on-off valve for switching on or off the flow of cooling fluid into the corresponding unit or cooling channel.

Technical Field

The invention relates to the field of heat dissipation of mining cars, in particular to a heat dissipation system for a mining car.

Background

Along with the continuous expansion of the scale of large-scale open-pit mines at home and abroad, the electric wheel mining vehicle has remarkable effect, and the current large-scale electric wheel mining vehicle undertakes the mining and transportation tasks of 40 percent of coal and 90 percent of iron ores in the world. Under the condition of equal yield, the large-tonnage mine car can reduce the number of cars, improve the working efficiency and the safety, along with the continuous increase of the tonnage, the power requirement on a mine car traction system (such as a converter, a traction motor and a generator) is higher and higher, and the requirement of a heat dissipation system as an important guarantee of the performance of the traction system is also higher. The existing mine vehicle heat dissipation system usually adopts a forced air cooling heat dissipation mode, and the cooling requirement of a vehicle is difficult to meet under the condition of large tonnage and large loss. Specifically speaking:

(1) the existing cooling fan is arranged at an air inlet on a walking platform of the whole vehicle to suck air, and blows a part of air to the converter through an air duct, and blows the other part of air to the rear axle box through the air duct so as to cool the wheel motor arranged at two sides of the rear axle; the cooling fan also blows a portion of the wind towards the generator itself. The converter is arranged on the whole vehicle walking platform, the generator is arranged in the middle of the vehicle frame, the wheel motor is arranged on two sides of the rear axle, and the distance between each part is long, so that the problems of complicated design and arrangement of the whole vehicle air duct, large wind resistance, difficult fan design and type selection and the like exist; meanwhile, the installation space of the whole vehicle is limited, and the air cooling system occupies a large space, so that the design difficulty of the whole vehicle is large, and the production and assembly are difficult.

(2) The existing air cooling heat dissipation mode can not realize high-efficiency heat dissipation, so that the traction system can not reliably and safely operate when the mine car is in large-tonnage and large-loss.

(3) Since the rotational speed of the cooling fan is equal to the rotational speed of the engine, the air volume of the cooling system is directly controlled by the rotational speed of the engine. When the vehicle goes downhill, the vehicle traction system needs a large cooling air volume, at the moment, the rotating speed of the engine needs to be increased to meet the cooling air volume, and the engine does not need to run with high power. Therefore, the conventional heat dissipation system needs to increase the rotation speed of the engine in order to provide sufficient cooling air volume, resulting in poor energy saving and oil consumption.

Disclosure of Invention

The invention aims to solve the technical problem of overcoming the defects of the prior art and provides the heat dissipation system for the mine car, which has high heat dissipation efficiency, small whole car weight and volume and convenient assembly and maintenance.

In order to solve the technical problems, the technical scheme provided by the invention is as follows:

the utility model provides a cooling system for mine car, includes circulation radiating channel, traction system cooling unit, carries out water-cooled water cooling unit to the high temperature coolant liquid to and control and protection radiating system's control protection unit, the water cooling unit with traction system cooling unit passes through circulation radiating channel establishes ties, control protection unit locates between water cooling unit and the traction system cooling unit.

As a further improvement of the above technical solution:

the traction system cooling unit comprises a converter cooling channel, a wheel motor cooling channel and a generator cooling channel which are arranged in parallel, and at least one group of the converter cooling channel, the wheel motor cooling channel and the generator cooling channel is communicated with the water cooling unit.

The water cooling unit comprises a fluid cooling fan, and the control protection unit comprises a water pump; the heat dissipation system also comprises a controller, an auxiliary variable unit and a data acquisition assembly for acquiring water temperature, water pressure and water flow at each part of the circulating heat dissipation channel; the controller is respectively connected with the data acquisition assembly and the auxiliary transformer unit, and the auxiliary transformer unit is connected with the fluid cooling fan and the water pump; and the controller sends a control instruction to the auxiliary variable unit according to the detection signal of the data acquisition assembly so as to control the rotating speed of the fluid cooling fan and the water pump.

The data acquisition assembly comprises a first acquisition area for acquiring data of the control unit and a second acquisition area for acquiring data of each cooling channel of the cooling unit of the traction system, wherein the first acquisition area comprises a second flow detection piece for acquiring and controlling water flow of the protection unit, a first temperature detection piece for acquiring and controlling inlet and return temperature of the protection unit and a first pressure detection piece for acquiring and controlling inlet and return pressure of the protection unit; the second collecting area comprises a second flow detection piece for collecting water flow of each cooling channel, a second temperature detection piece for collecting temperature of inlet water and outlet water of each cooling channel, and a second pressure detection piece for collecting pressure of inlet water and outlet water of each cooling channel.

The water cooling unit comprises a heat exchanger and a fluid cooling fan, the heat exchanger is arranged on the circulating heat dissipation channel, and a blowing port of the fluid cooling fan is arranged corresponding to the heat exchanger.

The cooling system for the mine car further comprises a brake resistor cooling unit, wherein the brake resistor cooling unit comprises a resistor box and a resistor cooling fan arranged at the air inlet of the resistor box; the heat exchanger is arranged at the air inlet of the resistor box, and the fluid cooling fan and the resistor cooling fan are the same cooling fan.

The control protection unit comprises a liquid supplementing assembly for supplementing lost cooling liquid when the system works and a liquid injection assembly for injecting the cooling liquid before the system works; the liquid supplementing assembly comprises an expansion water tank and an exhaust component, the expansion water tank is connected with the circulating heat dissipation channel in parallel, and the exhaust component is communicated with the expansion water tank; the liquid injection assembly is communicated with the circulating heat dissipation channel.

The control protection unit also comprises a water pump and a check valve for preventing the cooling liquid from reversely impacting the water pump, the water pump and the check valve are both arranged on the circulating heat dissipation channel and along the flowing direction of the cooling liquid, and the check valve is arranged at the downstream of the water pump.

The control protection unit further comprises a filter for filtering impurities in the cooling liquid, and the filter is arranged on a circulating heat dissipation channel at the output end of the water cooling unit.

And on-off valves for switching on or off the cooling liquid to enter the corresponding units or cooling channels are arranged on the cooling channels of the water cooling unit, the control protection unit and the traction system cooling unit.

Compared with the prior art, the invention has the advantages that:

the invention changes the structural form of the traditional air-cooled heat dissipation, realizes the water-cooled heat dissipation of the large-tonnage mine car through the combined arrangement form of the circulating heat dissipation channel, the traction system cooling unit, the water-cooled unit and the control protection unit, and completely replaces the air-cooled heat dissipation. Specifically, the water cooling unit and the traction system cooling unit are connected in series through a circulating heat dissipation channel, the water cooling unit is used for cooling high-temperature cooling liquid flowing out of the traction system, and the cooled low-temperature cooling liquid can be continuously circulated to the traction system cooling unit to cool all heating components, so that the energy-saving environment-friendly traction system is energy-saving and high in water cooling heat dissipation efficiency; meanwhile, the water-cooling heat dissipation can be connected with all heating parts of the traction system through the circulating heat dissipation pipeline laid on the frame, the pipeline arrangement is simple, the pipeline volume and the required installation space are small, the phenomena of large weight and large volume and difficult assembly caused by the fact that a huge air channel needs to be arranged on the air cooling system are avoided, the weight and the volume of all heating parts are reduced, the weight of the whole vehicle is correspondingly reduced, the load of the whole vehicle is increased, the design and the assembly of the whole vehicle are convenient, and the cost is low.

Meanwhile, the control protection unit is arranged between the water cooling unit and the traction system cooling unit, so that main components for controlling and protecting the heat dissipation system are arranged in a centralized manner, the integration level of the components is high, and the maintenance of the heat dissipation system is convenient. The invention meets the heat dissipation requirement of the large-tonnage mine car traction system, and has the advantages of low whole car weight, good loading capacity and convenient maintenance.

Drawings

The invention will be described in more detail hereinafter on the basis of embodiments and with reference to the accompanying drawings. Wherein:

FIG. 1 is a schematic view of the construction of the heat dissipating system for a mining vehicle according to the present invention.

FIG. 2 is another schematic view of the mine car heat dissipation system of the present invention.

FIG. 3 is a schematic view of the traction system of the mine car of the present invention.

The reference numerals in the figures denote:

1. a circulating heat dissipation channel; 2. a traction system cooling unit; 21. a converter cooling channel; 22. a wheel motor cooling channel; 23. a generator cooling channel; 3. a water cooling unit; 31. a fluid cooling fan; 32. a heat exchanger; 4. a control protection unit; 41. a water pump; 42. an expansion tank; 43. an exhaust component; 44. a liquid injection assembly; 45. a check valve; 46. a filter; 5. a data acquisition component; 51. a first flow rate detecting member; 52. a first temperature detection member; 53. a first pressure detecting member; 54. a second flow rate detecting member; 55. a second temperature detection member; 56. a second pressure detecting member; 6. a traction system; 61. an auxiliary transformation unit; 62. a generator; 63. a rectifying unit; 64. an inversion unit; 65. a wheel motor; 66. a chopper unit; 67. a power unit group; 7. a brake resistor cooling unit; 71. a resistance cooling fan; 72. a brake resistor; 8. and an on-off valve.

Detailed Description

The invention will be described in further detail with reference to the drawings and specific examples, without thereby limiting the scope of the invention.

As shown in FIG. 1, the heat dissipating system for a mine car according to the present embodiment includes a circulation heat dissipating passage 1, a traction system cooling unit 2, a water cooling unit 3, and a control and protection unit 4. The water cooling unit 3 and the traction system cooling unit 2 are connected in series through the circulating heat dissipation channel 1, and the water cooling unit 3 cools high-temperature cooling liquid passing through the traction system cooling unit 2; the control protection unit 4 is arranged between the water cooling unit 3 and the traction system cooling unit 2 and is used for controlling and protecting the whole heat dissipation system.

The invention changes the structural form of the traditional air-cooled heat dissipation, realizes the water-cooled heat dissipation of the large-tonnage mine car through the combined arrangement form of the circulating heat dissipation channel 1, the traction system cooling unit 2, the water-cooled unit 3 and the control protection unit 4, and replaces the air-cooled heat dissipation mode. Specifically, the water cooling unit 3 and the traction system cooling unit 2 are connected in series through the circulating heat dissipation channel 1, the water cooling unit 3 is used for cooling high-temperature cooling liquid flowing out of the traction system 6, the cooled low-temperature cooling liquid can be continuously circulated to the traction system cooling unit 2 to cool all heating components, and the cooling system is energy-saving, environment-friendly and high in water cooling heat dissipation efficiency. Meanwhile, the water-cooling heat dissipation can be connected with all heating parts of the traction system 6 through the circulating heat dissipation pipeline laid on the frame, the pipeline arrangement is simple, the pipeline volume and the required installation space are small, the phenomena that an air cooling system needs to be provided with a huge air channel, the weight is large, the assembly is difficult and the like are avoided, the weight and the volume of all heating parts are reduced, the weight of the whole vehicle is correspondingly reduced, the load of the whole vehicle is increased, the design and the assembly of the whole vehicle are convenient, and the cost is low.

The control protection unit 4 is arranged between the water cooling unit 3 and the traction system cooling unit 2, namely, main components for controlling and protecting the heat dissipation system are arranged in a centralized manner, the integration level of the components is high, and the maintenance of the heat dissipation system is convenient. The invention meets the heat dissipation requirement of the traction system 6 of the large-tonnage mine car, and has the advantages of low whole car weight, good loading capacity and convenient maintenance. The control protection unit 4 can be arranged independently or integrated with the converter, so that the vehicle walking space is reasonably utilized.

As shown in fig. 1, the traction system cooling unit 2 includes an inverter cooling channel 21, a wheel motor cooling channel 22, and a generator cooling channel 23, wherein a power unit group 67 of the inverter is disposed on the inverter cooling channel 21, and the power unit group 67 includes a rectifying unit 63, an inverting unit 64, and a chopper unit 66; wheel motor arrangement 65 is disposed on wheel motor cooling channel 22 and generator 62 is disposed on generator cooling channel 23 to facilitate heat dissipation from the corresponding heat generating components of traction system 6.

In this embodiment, the converter cooling channel 21, the wheel motor cooling channel 22, and the generator cooling channel 23 are arranged in parallel, and the converter cooling channel 21, the wheel motor cooling channel 22, and the generator cooling channel 23 are all communicated with the water cooling unit 3, so that each heat generating component of the traction system 6 can be effectively cooled by water, the power density of the converter, the generator 62, and the wheel motor 65 is improved, and the reliable and safe operation of the traction system 6 is ensured.

In other embodiments, the heat generating components of the traction system 6 can be flexibly configured according to the vehicle structure, so as to make reasonable use of space and facilitate the design of the vehicle, i.e. one or two of the converter cooling channel 21, the wheel motor cooling channel 22 and the generator cooling channel 23 can be communicated with the water cooling unit 3. As shown in fig. 2, the converter adopts water cooling to dissipate heat, the generator 62 and the wheel motor 65 can be realized by cutting off or closing the wheel motor cooling channel 22 and the generator cooling channel 23, the operation is convenient, and the space can be effectively utilized.

Further, the water cooling unit 3 includes a fluid cooling fan 31 for supplying cooling air; the control and protection unit 4 comprises a water pump 41 for providing coolant delivery power. Meanwhile, the heat dissipation system further comprises a controller, an auxiliary transformer unit 61 and a data acquisition assembly 5, wherein the controller is respectively connected with the data acquisition assembly 5 and the auxiliary transformer unit 61, and the auxiliary transformer unit 61 is connected with the fluid cooling fan 31 and the water pump 41. When the heat dissipation system works, the data acquisition assembly 5 acquires water temperature, water pressure and water flow at each position of the circulating heat dissipation channel 1, the controller sends a control instruction to the auxiliary variable unit 61 according to a detection signal of the data acquisition assembly 5, and the auxiliary variable unit 61 controls the rotating speed of the fluid cooling fan 31 and the water pump 41 so as to adjust the flow rate and cooling air volume of cooling liquid and meet the heat dissipation requirements of each heating component of the traction system 6.

The auxiliary transformer unit 61 adopts intermediate direct current energy acquisition, the controller controls the auxiliary transformer unit 61 to drive the fluid cooling fan 31 and the water pump 41, the rotating speed of the fluid cooling fan 31 and the rotating speed of the water pump 41 can be controlled in real time according to the loss condition of an electric drive system, the fuel consumption is greatly saved, the problem of high energy consumption of the cooling fan directly controlled by an engine in the existing structure is solved, and the energy-saving, environment-friendly and oil-saving effects are realized.

As shown in FIG. 3, the working principle of the large-tonnage mine car traction system is as follows: the three-phase alternating current generated by the generator 62 is converted into direct current through the rectifying unit 63, and then the direct current is output through the inverter unit 64 to drive the wheel motor 65, and the controllable three-phase alternating current is output through the auxiliary transformer unit 61 to respectively drive the fluid cooling fan 31 and the water pump 41. When the whole vehicle is braked, the energy fed back by the wheel motor 65 is converted into direct current through the inverter unit 64, part of the energy is consumed through the chopper unit 66, and the other part of the energy is output by the auxiliary transformer unit 61 to control three-phase alternating current to drive the fluid cooling fan 31 and the water pump 41 respectively.

When the whole vehicle works under different working conditions (such as heavy load, no load, uphill slope, downhill slope and the like) and different operating environments (such as plateau, plain and the like), the loss difference of the traction system 6 is large, the fluid cooling fan 31 is a variable-frequency cooling fan by adopting the control mode, and the water pump 41 is a variable-frequency water pump 41 which can adjust the rotating speed according to the heat dissipation requirement, so that the traction system 6 works in an ideal temperature environment all the time. Since the whole vehicle runs in a braking state in most of time, at the moment, the driving energy of the fluid cooling fan 31 and the water pump 41 comes from braking energy, the engine does not need to work at a high rotating speed, and the energy-saving effect is good.

Further, the data acquisition assembly 5 comprises a first acquisition region and a second acquisition region. The first collecting area is used for collecting data of the control unit in real time, and comprises a first flow detection part 51, a first temperature detection part 52 and a first pressure detection part 53. Wherein, the first flow detection piece 51 is arranged at the liquid inlet section of the circulating heat dissipation channel 1 to collect and control the water flow of the protection unit 4; the number of the first temperature detection pieces 52 is two, and the two first temperature detection pieces 52 are respectively arranged at the liquid inlet section and the backflow section of the circulating heat dissipation channel 1 so as to collect and control the inlet and backflow temperatures of the protection unit 4; the first pressure detection pieces 53 are two, and the two first pressure detection pieces 53 are respectively arranged on the liquid inlet section and the backflow section of the circulating heat dissipation channel 1 to collect the inlet backflow pressure of the control protection unit 4.

Meanwhile, the second collecting area is used for collecting data of each cooling channel of the traction system cooling unit 2 in real time, and the second collecting area comprises a second flow detecting element 54, a second temperature detecting element 55 and a second pressure detecting element 56. The number of the second flow detection pieces 54 is three, and the three second flow detection pieces 54 are respectively arranged at the liquid inlet sections of the converter cooling channel 21, the wheel motor cooling channel 22 and the generator cooling channel 23 so as to collect the water flow of each cooling channel; six second temperature detection pieces 55 are arranged, and one liquid inlet section and one liquid outlet section of the converter cooling channel 21, the wheel motor cooling channel 22 and the generator cooling channel 23 are respectively arranged to collect the temperature of inlet and outlet water of each cooling channel; six second pressure detection pieces 56 are arranged, and one liquid inlet section and one liquid outlet section of the converter cooling channel 21, the wheel motor cooling channel 22 and the generator cooling channel 23 are respectively arranged to collect the water inlet pressure and the water outlet pressure of each cooling channel. The arrangement form of the data acquisition assembly 5 realizes real-time and accurate detection of the circulating heat dissipation channel 1 and each cooling channel, ensures real-time and effective adjustment of the flow rate and the cooling air volume of the cooling liquid, and meets the heat dissipation requirement of the large-tonnage mining vehicle traction system 6.

In the present embodiment, the water cooling unit 3 includes a heat exchanger 32 and a fluid cooling fan 31. The heat exchanger 32 is disposed on the circulating heat dissipation channel 1, and the air blowing port of the fluid cooling fan 31 is disposed corresponding to the heat exchanger 32, so that the structure is simple. During heat dissipation, high-temperature cooling liquid generated by the traction system cooling unit 2 flows into the heat exchanger 32 and is fully dissipated through the fluid cooling fan 31, at the moment, the high-temperature cooling liquid is changed into low-temperature cooling liquid and flows into the traction system cooling unit 2 for recycling, and the heat dissipation effect is good, energy is saved, and the environment is protected.

Further, as shown in fig. 1, the heat dissipation system for the mine car further comprises a brake resistor cooling unit 7, wherein the brake resistor cooling unit 7 comprises a resistor box and a resistor cooling fan 71, and the resistor cooling fan 71 is arranged at an air inlet of the resistor box. In this embodiment, the heat exchanger 32 is installed at the air inlet of the resistor box, and the fluid cooling fan 31 and the resistor cooling fan 71 are the same cooling fan, that is, the cooling fan can simultaneously dissipate heat of the high-temperature cooling fluid and the brake resistor 72, and the same fan is shared without additionally adding a fan, so that the cost is low.

Meanwhile, the heat exchanger 32 is large in area and small in thickness, and the area of the air inlet of the resistor box is large, so that the heat exchanger 32 is integrally installed at the air inlet of the resistor box, the size is increased, the installation space of the water cooling unit 3 can be reasonably utilized, the layout is compact, and the design of the whole vehicle is convenient.

In this embodiment, since the volume of the cooling liquid changes with the temperature change and the cooling liquid has a certain loss, the control and protection unit 4 of the present invention further includes a liquid replenishing assembly and a liquid injecting assembly 44. The liquid supplementing assembly comprises an expansion water tank 42 and an exhaust part 43, the expansion water tank 42 is connected with the circulating heat dissipation channel 1 in parallel, namely the expansion water tank 42 is respectively communicated with a liquid inlet section and a backflow section of the circulating heat dissipation channel 1, so that the expansion water tank 42 is used for automatically supplementing cooling liquid when the system works, and the pressure of the heat dissipation system is ensured to be stable; the air exhaust part 43 is communicated with the expansion water tank 42 to exhaust air during liquid replenishment, so that reliable operation of the expansion water tank 42 is ensured. Meanwhile, the liquid injection assembly 44 is communicated with the circulating heat dissipation channel 1 so as to fill the circulating heat dissipation channel 1 with the cooling liquid before the system works.

In this embodiment, the exhaust unit 43 includes an exhaust pipe communicating with the inside of the expansion tank 42 and an exhaust valve provided on the exhaust pipe. The liquid injection assembly 44 comprises a liquid injection pipe and a liquid injection control valve, the liquid injection pipe is communicated with the circulating heat dissipation channel 1, and the liquid injection control valve is arranged on the liquid injection pipe.

Further, the control and protection unit 4 further includes a water pump 41 and a check valve 45. The water pump 41 and the check valve 45 are both arranged on the circulating heat dissipation channel 1; and along the flow direction of the coolant, the check valve 45 is disposed downstream of the water pump 41 to prevent the coolant from reversely impacting the water pump 41, thereby ensuring reliable operation of the water pump 41.

Further, the control protection unit 4 further includes a filter 46, and the filter 46 is disposed on the circulating heat dissipation channel 1 at the output end of the water cooling unit 3 to filter impurities in the cooling liquid, so as to ensure the purity of the cooling liquid entering the traction system cooling unit 2, and avoid damage to heat generating components of the traction system 6.

As shown in fig. 1, in this embodiment, on-off valves 8 are disposed on cooling channels of the water cooling unit 3, the control protection unit 4, and the traction system cooling unit 2, so as to switch on or off cooling liquid entering the corresponding unit or cooling channel, thereby facilitating maintenance of the corresponding unit and cooling channel.

While the invention has been described with reference to a preferred embodiment, various modifications may be made and equivalents may be substituted for elements thereof without departing from the scope of the invention. In particular, the technical features mentioned in the embodiments can be combined in any way as long as there is no structural conflict. It is intended that the invention not be limited to the particular embodiments disclosed, but that the invention will include all embodiments falling within the scope of the appended claims.