Thermal management system of new energy engineering machinery vehicle

Abstract

The invention provides a heat management system of a new energy engineering machinery vehicle, which comprises a refrigerant loop and a motor water cooling loop, the refrigerant loop comprises a compressor, a heat exchanger, a gas-liquid separator, a condenser, an evaporator and a heat exchange plate, and the compressor is communicated with an outdoor heat exchanger, the condenser, the evaporator and the like through a stop valve, an electronic expansion valve and the like; the circulation of the refrigerant is realized; the motor water cooling loop comprises a centrifugal water pump, a to-be-cooled motor, a radiator and an expansion water tank, cooling water is circularly conveyed to the to-be-cooled motor through the centrifugal water pump to be cooled, meanwhile, the heated cooling water can serve as a heat exchange source in the refrigerant loop, and waste heat of the motor is fully utilized. According to the heat management system, cab refrigeration, dehumidification, heating and motor cooling are integrated, rapid switching of various working modes such as cab refrigeration, powerful dehumidification, common dehumidification, heat pump heating and motor cooling can be achieved through centralized control, and flexible use and control in various environments can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of thermal management of new energy vehicles, and in particular to a thermal management system for new energy engineering machinery vehicles. Background Art

[0002] High geothermal tunnels refer to tunnel projects that pass through high geothermal areas. Such tunnels usually have high rock and water temperatures, which cause the temperature in the tunnel to reach or exceed 28°C. Especially when high-temperature hot water surges in the tunnel, the highest environment can reach above 45°C, and the highest relative humidity is close to 100%. Compared with ordinary tunnel construction, engineering machinery vehicles working in high temperature and high humidity environments need to have stronger heat dissipation capabilities. Not only must they ensure efficient cooling effects, but they must also meet higher dehumidification and defogging requirements. Therefore, for new energy engineering vehicles, it is particularly critical to configure an advanced thermal management system.

[0003] In the harsh environment of high temperature and high humidity, new energy engineering machinery vehicles need to have sufficient dehumidification capacity in addition to ensuring a strong cooling effect. At present, the thermal management system of new energy engineering machinery vehicles has the following shortcomings: First, new energy engineering vehicles usually divide battery cooling and cab cooling into two independent refrigeration systems. This separate design usually leads to low energy utilization efficiency and cannot achieve heat energy sharing between systems, resulting in unsatisfactory overall heat dissipation and cooling effects, and insufficient overall dehumidification and cooling capacity; secondly, in the environment of high temperature and high humidity, although the existing vehicle refrigeration system can provide cooling effect, its dehumidification capacity is relatively limited, and it is difficult to effectively deal with the high humidity problem in the hot and humid environment of high geothermal tunnels, resulting in excessive humidity in the vehicle, affecting comfort and operating efficiency; in addition, the currently used thermal expansion valve responds slowly to changes in external temperature, humidity and other conditions, and has limited adjustment speed and flexibility, resulting in the refrigeration system being unable to quickly adapt to environmental changes, affecting the cooling and heat dissipation effects, especially in extreme environments; finally, the overall design of the thermal management system of existing vehicles lacks integration and cannot efficiently handle the heat requirements of batteries, cabs and other components at the same time. This not only increases the complexity of the system, but also increases maintenance and management costs.

[0004] It should be noted that the above introduction to the technical background is only for the convenience of providing a clear and complete description of the technical solutions of the present application and for the convenience of understanding by those skilled in the art. It cannot be considered that the above technical solutions are well known to those skilled in the art simply because they are described in the background technology section of the present application. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the prior art and to provide a thermal management system for new energy engineering machinery vehicles. The system can realize multiple working modes such as cab cooling, strong dehumidification, heat pump heating, motor cooling, etc. through centralized control. It has flexible control capabilities in different environments and is particularly suitable for efficient operation under high temperature and high humidity construction conditions.

[0006] In order to achieve the above-mentioned purpose, the present invention provides a thermal management system for a new energy engineering machinery vehicle, including a refrigerant circuit and a motor water cooling circuit, wherein the refrigerant circuit includes a compressor, a heat exchanger, a gas-liquid separator, a condenser, an evaporator and a heat exchange plate, wherein the compressor is respectively connected to a first stop valve and a second stop valve, the first stop valve is connected to the condenser, the condenser is respectively connected to a third stop valve, a second electronic expansion valve and a third electronic expansion valve, the third stop valve is respectively connected to a fourth stop valve and the first electronic expansion valve, the fourth stop valve is connected to the gas-liquid separator, the gas-liquid separator is connected to the compressor, the first electronic expansion valve is connected to the evaporator, and the evaporator is connected to the gas-liquid separator; the second electronic expansion valve is connected to the refrigerant inlet of the heat exchange plate, and the refrigerant outlet of the heat exchange plate is connected to the gas-liquid separator through the fourth stop valve; the third electronic expansion valve is connected to the heat exchanger; the second stop valve is connected to the heat exchanger, and the heat exchanger is respectively connected to the first electronic expansion valve and the fourth stop valve.

[0007] The motor water cooling circuit includes a centrifugal water pump, a motor to be cooled, a radiator, and an expansion water tank. The centrifugal water pump is connected to the heat medium inlet of the heat exchange plate, and the heat medium outlet of the heat exchange plate is connected to the motor to be cooled. The motor to be cooled is connected to the centrifugal water pump through the expansion water tank, the first water valve and the second water valve respectively, and the radiator is also connected between the second water valve and the centrifugal water pump.

[0008] Furthermore, a temperature sensor is provided at the outlet end of the compressor, a temperature and pressure sensor is provided at the inlet end of the gas-liquid separator, a first pressure sensor is provided at the outlet end of the heat exchanger, and a second pressure sensor is provided at the outlet end of the condenser.

[0009] Furthermore, a first cooling fan is arranged on the heat exchanger, and a second cooling fan is arranged on the radiator.

[0010] Furthermore, a multi-in-one controller is provided at the water outlet of the centrifugal water pump, and the motor to be cooled includes an upper motor and a chassis motor.

[0011] Furthermore, a PTC heating module is arranged outside the condenser.

[0012] Furthermore, in the cab cooling mode, the second stop valve and the first electronic expansion valve are opened, and the first stop valve, the third stop valve, the fourth stop valve, the second electronic expansion valve, and the third electronic expansion valve are all closed; the second water valve is opened, and the first water valve is closed.

[0013] Furthermore, in the enhanced dehumidification mode of the cab, the first stop valve, the third stop valve and the first electronic expansion valve are opened, and the second stop valve, the fourth stop valve, the second electronic expansion valve and the third electronic expansion valve are all closed; the second water valve is opened, and the first water valve is closed.

[0014] Furthermore, in the cab dehumidification and cooling mode, the first stop valve, the second stop valve, the third stop valve and the first electronic expansion valve are opened, and the fourth stop valve, the second electronic expansion valve and the third electronic expansion valve are closed; the second water valve is opened, and the first water valve is closed.

[0015] Furthermore, in the cab air source heating and auxiliary heating mode, the first stop valve, the fourth stop valve and the third electronic expansion valve are opened, and the second stop valve, the third stop valve, the first electronic expansion valve and the second electronic expansion valve are closed; the PTC heating module starts heating; the centrifugal water pump, the first water valve and the second water valve are all closed.

[0016] Furthermore, in the cab water source heat pump heating mode, the first stop valve, the fourth stop valve and the second electronic expansion valve are opened, and the second stop valve, the third stop valve, the first electronic expansion valve and the third electronic expansion valve are all closed; the PTC heating module stops heating; the first water valve is opened, and the second water valve is closed.

[0017] The above scheme of the present invention has the following beneficial effects:

[0018] The thermal management system for new energy engineering machinery vehicles provided by the present invention integrates the functions of cab cooling, dehumidification, heating and motor cooling. Through centralized control, it can realize rapid switching of various working modes such as cab cooling, strong dehumidification, ordinary dehumidification, heat pump heating, motor cooling, etc., and flexibly adapt to the usage requirements in various environments.

[0019] The thermal management system of the new energy engineering machinery vehicle of the present invention can simultaneously cool and dehumidify the cab through the switching of the stop valve and the electronic expansion valve; when either the temperature or humidity value in the cab exceeds the preset maximum threshold value, the system can switch to a forced cooling mode or a forced dehumidification mode, which is particularly suitable for use in high temperature and high humidity tunnel construction environments.

[0020] When the cab needs to be heated, the waste heat generated by the motor can be effectively utilized through the heat exchange plate; when the heat generated by the motor is insufficient, rapid heating can be achieved by relying solely on the compressor and PTC heating module. This is flexible and diverse and can effectively save energy.

[0021] Other beneficial effects of the present invention will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] Figure 1 It is a schematic diagram of the structure of the thermal management system of the new energy engineering machinery vehicle of the present invention;

[0023] Figure 2 This is a schematic diagram of a thermal management system in a cab cooling mode in Embodiment 2 of the present invention;

[0024] Figure 3 This is a schematic diagram of the thermal management system in the enhanced dehumidification mode of the cab in Example 3 of the present invention;

[0025] Figure 4 This is a schematic diagram of the thermal management system in the dehumidification and cooling modes of the cab in Example 4 of the present invention;

[0026] Figure 5 This is a schematic diagram of the thermal management system in the cab air source heating and auxiliary heating modes in Example 5 of the present invention;

[0027] Figure 6 This is a schematic diagram of the thermal management system in Example 6 of the present invention in the cab water source heat pump heating mode.

[0028] [Description of Reference Numerals]

[0029] 1- compressor; 2- temperature sensor; 3- first stop valve; 4- second stop valve; 5- third stop valve; 6- fourth stop valve; 7- heat exchanger; 8- first pressure sensor; 9- gas-liquid separator; 10- temperature and pressure sensor; 11- first electronic expansion valve; 12- second electronic expansion valve; 13- third electronic expansion valve; 14- condenser; 15- evaporator; 16- PTC heating module; 17- second pressure sensor; 18- centrifugal water pump; 19- all-in-one controller; 20- heat exchange plate; 21- upper motor; 22- chassis motor; 23- radiator; 24- expansion water tank; 25- first water valve; 26- second water valve; 27- first cooling fan; 28- second cooling fan. DETAILED DESCRIPTION

[0030] In order to make the purpose, technical scheme and advantages of the present invention clearer, the present invention is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not intended to limit the present invention. The various specific technical features and embodiments described in the specific embodiments can be combined in any suitable manner without contradiction. For example, different embodiments can be formed by combining different specific technical features / embodiments. In order to avoid unnecessary repetition, the various possible combinations of the specific technical features / embodiments in the present invention are no longer described separately.

[0031] It should be noted that the terms "set" and "connect" should be understood in a broad sense. For example, they can be directly set, installed, or connected, or they can be indirectly set or connected through a central component or a central structure. In addition, the orientations or positional relationships indicated by "center", "up", "down", "left", "right", "vertical", "horizontal", "inside", "outside", etc. in the present invention are based on the orientations or positional relationships shown in the drawings or the conventional placement state or use state, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred structural parts, features, devices or elements must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention.

[0032] Example 1

[0033] like Figure 1As shown, this embodiment provides a thermal management system for a new energy engineering machinery vehicle, including a refrigerant circuit and a motor water cooling circuit. The refrigerant circuit includes a compressor 1, a heat exchanger 7, a gas-liquid separator 9, a condenser 14, an evaporator 15 and a heat exchange plate 20. The compressor 1 is used to compress the refrigerant into a high-pressure and high-temperature gas. The outlet end of the compressor 1 is provided with a temperature sensor 2, which is used to monitor the temperature of the refrigerant compressed by the compressor 1, and can confirm whether the compressor 1 is working normally. The compressor 1 is connected to the first stop valve 3 and the second stop valve 4 respectively, and the first stop valve 3 is connected to the condenser 14. The condenser 14 is used to condense the high-temperature gas into liquid and release heat. A PTC heating module 16 is provided outside the condenser 14. In the heating mode, the PTC heating module 16 can be started as needed to enhance the heating effect. The condenser 14 is connected to the third stop valve 5, the second electronic expansion valve 12 and the third electronic expansion valve 13 respectively. The electronic expansion valve uses the electrical signal generated by the adjusted parameter to control the voltage or current applied to the expansion valve, thereby achieving the purpose of adjusting the liquid supply. Compared with the traditional throttling device (such as the thermal expansion valve), the adjustment range of the refrigerant liquid supply is wide and the adjustment response is fast. The third stop valve 5 is connected to the fourth stop valve 6 and the first electronic expansion valve 11 respectively. The fourth stop valve 6 is connected to the gas-liquid separator 9. The gas-liquid separator 9 is used to separate the gas and liquid of the transported refrigerant. The gas-liquid separator 9 is connected to the compressor 1. The gas refrigerant separated by the gas-liquid separator 9 is continuously sent to the compressor 1 for compression to form a cycle. A temperature and pressure sensor 10 is provided at the inlet end of the gas-liquid separator 9 to monitor the temperature and pressure of the refrigerant transported back, and to feedback and adjust the opening of the electronic expansion valve according to the temperature and pressure value of the refluxed refrigerant. The first electronic expansion valve 11 is connected to the evaporator 15, which is used to vaporize the delivered liquid refrigerant under low pressure to form a gaseous refrigerant, absorb heat to cool the cab, and the evaporator 15 is connected to the gas-liquid separator 9, through which the refrigerant is delivered back to the compressor 1. The second electronic expansion valve 12 is connected to the refrigerant inlet of the heat exchange plate 20, and the refrigerant outlet of the heat exchange plate 20 is connected to the gas-liquid separator 9 through the fourth stop valve 6; the third electronic expansion valve 13 is connected to the heat exchanger 7; the second stop valve 4 is connected to the heat exchanger 7, and the heat exchanger 7 is respectively connected to the first electronic expansion valve 11 and the fourth stop valve 6. The heat exchanger 7 is provided with a first cooling fan 27 to assist the heat exchanger in exchanging heat with the outside world, and the outlet end of the heat exchanger 7 is provided with a first pressure sensor 8 to monitor the pressure of the liquid or gas refrigerant output by the heat exchanger 7. The heat exchanger 7 can condense the high-temperature and high-pressure gas refrigerant delivered by the compressor 1 through the second stop valve 4 into liquid; at the same time, the heat exchanger 7 can also serve as an evaporation device to evaporate and vaporize the liquid refrigerant delivered by the condenser 14 through the third electronic expansion valve 13. A second pressure sensor 17 is provided at the outlet end of the condenser 14 to monitor the pressure of the liquid refrigerant delivered by the condenser 14.

[0034] The motor water cooling circuit includes a centrifugal water pump 18, a motor to be cooled, a radiator 23, and an expansion water tank 24. The centrifugal water pump 18 is connected to the heat medium inlet of the heat exchange plate 20, and the heat medium outlet of the heat exchange plate 20 is connected to the motor to be cooled. The motor to be cooled includes an upper motor 21 and a chassis motor 22. The upper motor 21 and the chassis motor 22 are connected to the centrifugal water pump 18 through an expansion water tank 24, a first water valve 25, and a second water valve 26, respectively. A radiator 23 is also connected between the second water valve 26 and the centrifugal water pump 18. The expansion water tank 24 accommodates the expansion amount of the cooling water in the motor water cooling circuit, and also plays a role in constant pressure and replenishing water for the system; a second cooling fan 28 is arranged on the radiator 23. After the cooling water flows through the motor to be cooled, the water temperature rises, and the circulating cooling water can be cooled by heat exchange with the outside through the radiator 23. The condenser 14, the evaporator 15, and the PTC heating module 16 together form the air conditioning box in the cab.

[0035] Furthermore, an all-in-one controller 19 is provided at the water outlet of the centrifugal water pump 18 for controlling the start and stop of the centrifugal water pump 18 and the flow rate of cooling water.

[0036] Example 2

[0037] like Figure 2 As shown, it is the cab cooling mode of the thermal management system of the present invention, the second stop valve 4 and the first electronic expansion valve 11 are open, the first stop valve 3, the third stop valve 5, the fourth stop valve 6, the second electronic expansion valve 12, and the third electronic expansion valve 13 are all closed; the second water valve 26 is opened, and the first water valve 25 is closed. The compressor 1 is working, and the refrigerant is compressed by the compressor 1 into a high-pressure and high-temperature gas, which enters the outdoor heat exchanger 7 through the second stop valve 4. The high-temperature and high-pressure gas is condensed into a liquid state after heat exchange in the heat exchanger 7. The liquid refrigerant is throttled by the first electronic expansion valve 11, evaporates and exchanges heat in the evaporator 15 of the air conditioner, so as to cool the cab. The temperature and pressure sensor 10 measures the gas pressure and temperature of the gas input to the gas-liquid separator 9, and controls the opening of the first electronic expansion valve 11 by calculating the superheat; the refrigerant gas output by the evaporator 15 passes through the gas-liquid separator 9 and the gas refrigerant returns to the compressor 1, completing the refrigeration cycle.

[0038] The first water valve 25 in the motor water cooling circuit is closed, the second water valve 26 is opened, and the centrifugal water pump 18 delivers circulating water to the upper motor 21 and the chassis motor 22 to cool the upper motor 21 and the chassis motor 22. The circulating water whose temperature is increased by heat exchange is delivered to the radiator 23 through the second water valve 26 for heat dissipation and cooling. The cooled cooling water flows back to the centrifugal water pump to form a cooling cycle.

[0039] Example 3

[0040] like Figure 3As shown, it is the enhanced dehumidification mode of the cab, the first stop valve 3, the third stop valve 5 and the first electronic expansion valve 11 are open, and the second stop valve 4, the fourth stop valve 6, the second electronic expansion valve 12 and the third electronic expansion valve 13 are all closed. The compressor 1 is working, and the high-temperature and high-pressure gas enters the air-conditioning box condenser 14 through the first stop valve 3 to condense into liquid, and then enters the first expansion valve 11 through the third stop valve 5 for throttling control, and then enters the evaporator 15. The liquid refrigerant vaporizes in the low-pressure environment of the evaporator 15, and the refrigerant vaporizes and absorbs heat in the evaporator 15. After the vaporized refrigerant passes through the gas-liquid separator 9 to separate the liquid refrigerant, the gas refrigerant returns to the compressor 1 again to form a cycle. This process is mainly a dehumidification process. When running at high speed, the evaporator 15 absorbs heat due to vaporization, and the surface temperature is very low, which can reduce the dew point of the air when it is cold, and the water vapor condenses and precipitates. The condenser 14 condenses and releases heat to heat the low-temperature gas. The indoor temperature remains unchanged, and the purpose of enhanced dehumidification is achieved.

[0041] The operation of the motor water cooling circuit in this embodiment is the same as that of the motor water cooling circuit in Embodiment 2.

[0042] Example 4

[0043] like Figure 4 As shown, it is the dehumidification and cooling mode of the cab, the first stop valve 3, the second stop valve 4, the third stop valve 5 and the first electronic expansion valve 11 are open, and the fourth stop valve 6, the second electronic expansion valve 12 and the third electronic expansion valve 13 are closed. The compressor 1 is working, and the high-temperature and high-pressure refrigerant gas is condensed by the outdoor heat exchanger 7 and the condenser 14 in the cab and then merges, throttled by the first electronic expansion valve 11, enters the evaporator 15 of the cab air conditioner to evaporate and absorb heat, and then returns to the compressor 1 through the gas-liquid separator 10 for circulation. Part of the refrigerant gas condenses and releases heat through the outdoor heat exchanger 7, and the heat is released to the outside, so that the heat absorbed by the evaporator 15 is greater than the heat released by the condenser 14. The air in the cab is generally dehumidified and has a certain cooling effect.

[0044] The operation of the motor water cooling circuit in this embodiment is the same as that of the motor water cooling circuit in Embodiment 2.

[0045] Example 5

[0046] like Figure 5As shown, it is the cab air source heating and auxiliary heating mode, the first stop valve 3, the fourth stop valve and the third electronic expansion valve 13 are opened, the second stop valve 4, the third stop valve 5, the first electronic expansion valve 11 and the second electronic expansion valve 12 are closed; the PTC heating module 14 starts heating. The compressor 1 works, and the high-temperature and high-pressure gas refrigerant enters the condenser 14 of the air conditioning box through the first stop valve. The condenser 14 liquefies the refrigerant and releases heat, thereby heating the outlet air temperature of the cab. The PTC heating module 14 assists in heating the outlet air temperature of the cab. The refrigerant condensed into liquid passes through the throttling adjustment of the third electronic expansion valve 13 and enters the outdoor heat exchanger 7. At this time, the heat exchanger 7 vaporizes the liquid cold refrigerant into gas and exchanges heat with the outside air. After washing the heat of the outside air, the refrigerant gas vaporized by the heat exchanger 7 enters the gas-liquid separator 9 through the fourth stop valve 6, and finally returns to the compressor 1 to realize the heat pump cycle.

[0047] When the air temperature is low, the temperature of the upper motor 21 and the chassis motor 22 is low, the water temperature is low, the motor water cooling circuit may not be started, and the centrifugal water pump 18, the first water valve 25 and the second water valve 26 are all closed.

[0048] Example 6

[0049] like Figure 6 As shown, in the cab water source heat pump heating mode, the core temperature of the motor controller is high and needs to be dissipated, the first water valve 25 is opened, the second water valve 26 is closed, and the cooling circulating water is transported to the upper motor 21 and the chassis motor 22 through the centrifugal water pump 18 to cool the motor control core. The temperature of the circulating cooling water will increase. At this time, the reflux circulating water does not pass through the radiator 23 for heat dissipation, but directly flows back to the centrifugal water pump 18 through the first water valve 25 for circulation. The external heat exchange is mainly achieved through the heat exchange plate 20 with the refrigerant circuit.

[0050] In the refrigerant circuit, the first stop valve 3, the fourth stop valve 6 and the second electronic expansion valve 12 are opened, and the second stop valve 4, the third stop valve 5, the first electronic expansion valve 11 and the third electronic expansion valve 13 are all closed; the PTC heating module does not need to be heated. The compressor 1 is working, and the high-temperature and high-pressure refrigerant gas enters the condenser 14 through the first stop valve 3. The gas refrigerant liquefies and releases heat in the condenser 14 and heats the cab air to meet the heating requirements. The refrigerant liquid enters the heat exchange plate 20 after the flow is adjusted by the second throttle valve 12. After heat exchange with the hot water in the motor water cooling circuit in the heat exchange plate 20, it evaporates and gasifies, passes through the fourth stop valve, enters the gas-liquid separator 9, and finally returns to the compressor 1 for circulation, realizing water source heat pump heating. The water source heat pump heating mode of this embodiment uses the heat dissipated by the motor to exchange heat with the refrigerant in the refrigerant circuit, which not only improves the heating effect, but also does not require the PTC heating module 14 to assist in heating, and does not require the outdoor heat exchanger 7 or radiator 23 to work for heat exchange, saving energy.

[0051] The above is a preferred embodiment of the present invention. It should be pointed out that for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principles of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A thermal management system for a new energy engineering machinery vehicle, characterized in that: The invention comprises a refrigerant circuit and a motor water cooling circuit, wherein the refrigerant circuit comprises a compressor (1), a heat exchanger (7), a gas-liquid separator (9), a condenser (14), an evaporator (15) and a heat exchange plate (20), wherein the compressor (1) is respectively connected to a first stop valve (3) and a second stop valve (4), wherein the first stop valve (3) is connected to the condenser (14), wherein the condenser (14) is respectively connected to a third stop valve (5), a second electronic expansion valve (12) and a third electronic expansion valve (13), wherein the third stop valve (5) is connected to a fourth stop valve (6) and the first electronic expansion valve (11), wherein the fourth stop valve (6) is connected to the gas-liquid separator ( 9), the gas-liquid separator (9) is connected to the compressor (1), the first electronic expansion valve (11) is connected to the evaporator (15), and the evaporator (15) is connected to the gas-liquid separator (10); the second electronic expansion valve (12) is connected to the refrigerant inlet of the heat exchange plate (20), and the refrigerant outlet of the heat exchange plate (20) is connected to the gas-liquid separator (9) through a fourth stop valve (6); the third electronic expansion valve (13) is connected to the heat exchanger (7); the second stop valve (4) is connected to the heat exchanger (7), and the heat exchanger (7) is respectively connected to the first electronic expansion valve (11) and the fourth stop valve (6); The motor water cooling circuit comprises a centrifugal water pump (18), a motor to be cooled, a radiator (23), and an expansion water tank (24); the centrifugal water pump (18) is connected to a heat medium inlet of the heat exchange plate (20); the heat medium outlet of the heat exchange plate (20) is connected to the motor to be cooled; the motor to be cooled is connected to the centrifugal water pump (18) via the expansion water tank (24), a first water valve (25), and a second water valve (26), respectively; the radiator (23) is also connected between the second water valve (26) and the centrifugal water pump (18).

2. The thermal management system of the new energy engineering machinery vehicle according to claim 1 is characterized in that: The outlet end of the compressor (1) is provided with a temperature sensor (2), the inlet end of the gas-liquid separator (9) is provided with a temperature and pressure sensor (10), the outlet end of the heat exchanger (7) is provided with a first pressure sensor (8), and the outlet end of the condenser (14) is provided with a second pressure sensor (17).

3. The thermal management system of the new energy engineering machinery vehicle according to claim 1 is characterized in that: The heat exchanger (7) is provided with a first cooling fan (27), and the radiator (23) is provided with a second cooling fan (28).

4. The thermal management system of the new energy engineering machinery vehicle according to claim 1, characterized in that: The water outlet of the centrifugal water pump (18) is provided with an all-in-one controller (19), and the motor to be cooled comprises an upper motor (21) and a chassis motor (22).

5. The thermal management system of the new energy engineering machinery vehicle according to claim 1, characterized in that: A PTC heating module (16) is arranged outside the condenser (14).

6. The thermal management system of the new energy engineering machinery vehicle according to claim 1, characterized in that: In the cab cooling mode, the second stop valve (4) and the first electronic expansion valve (11) are opened, and the first stop valve (3), the third stop valve (5), the fourth stop valve (6), the second electronic expansion valve (12), and the third electronic expansion valve (13) are all closed; the second water valve (26) is opened, and the first water valve (25) is closed.

7. The thermal management system of the new energy engineering machinery vehicle according to claim 1, characterized in that: In the enhanced dehumidification mode of the cab, the first stop valve (3), the third stop valve (5) and the first electronic expansion valve (11) are opened, and the second stop valve (4), the fourth stop valve (6), the second electronic expansion valve (12) and the third electronic expansion valve (13) are all closed; the second water valve (26) is opened, and the first water valve (25) is closed.

8. The thermal management system of the new energy engineering machinery vehicle according to claim 1, characterized in that: In the cab dehumidification and cooling mode, the first stop valve (3), the second stop valve (4), the third stop valve (5) and the first electronic expansion valve (11) are opened, and the fourth stop valve (6), the second electronic expansion valve (12) and the third electronic expansion valve (13) are closed; the second water valve (26) is opened, and the first water valve (25) is closed.

9. The thermal management system of the new energy engineering machinery vehicle according to claim 5, characterized in that: In the cab air source heating and auxiliary heating mode, the first stop valve (3), the fourth stop valve (6) and the third electronic expansion valve (13) are opened, and the second stop valve (4), the third stop valve (5), the first electronic expansion valve (11) and the second electronic expansion valve (12) are closed; the PTC heating module (16) starts heating; and the centrifugal water pump (18), the first water valve (25) and the second water valve (26) are all closed.

10. The thermal management system of the new energy engineering machinery vehicle according to claim 5, characterized in that: In the cab water source heat pump heating mode, the first stop valve (3), the fourth stop valve (6) and the second electronic expansion valve (12) are opened, and the second stop valve (4), the third stop valve (5), the first electronic expansion valve (11) and the third electronic expansion valve (13) are all closed; the PTC heating module (16) stops heating; the first water valve (25) is opened, and the second water valve (26) is closed.

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