Cooling and heating type air conditioning system

Abstract

The utility model provides a cooling and heating type air conditioning system, and belongs to the technical field of air conditioners. The cooling and heating type air conditioning system comprises a refrigerating loop, a motor heat dissipation loop, a heating loop and an evaporation box. The refrigerating circuit comprises a compressor, a first electromagnetic valve, an outer condensation assembly, a second electromagnetic valve, a first expansion valve and an evaporation assembly which are sequentially communicated and form a circuit. The motor heat dissipation loop comprises a water pump and a heater which are sequentially communicated to form a loop, a first port of the heat exchanger is communicated with a water inlet of the water pump, and a second port of the heat exchanger is communicated with a water outlet of the water pump. The heating loop comprises a third electromagnetic valve, an inner condensation assembly, a fourth electromagnetic valve and a second expansion valve. The evaporation box accommodates the evaporation assembly and the inner condensation assembly. When the external environment temperature is very low, the good heating effect can still be kept, and the energy efficiency is improved through the working heat of the motor assembly of the engineering machine.

Description

Technical Field

[0001] The present disclosure belongs to the technical field of air conditioners, and particularly relates to a heating and cooling type air conditioning system. Background Art

[0002] Large construction machinery has a relatively large heating demand during winter operations.

[0003] In the related art, a heat pump air conditioner is generally configured in construction machinery to achieve refrigeration and heating functions. During heating, the heat pump air conditioner transfers the heat in the external environment to the cab to meet the heating demand of construction machinery during winter operations.

[0004] However, in winter, due to the very low external environmental temperature, the amount of heat available for the heat pump air conditioner to transfer is small, and the heating effect of the heat pump air conditioner is poor. Content of the Utility Model

[0005] Embodiments of the present disclosure provide a heating and cooling type air conditioning system, which can still maintain a good heating effect when the external environmental temperature is very low, and utilize the working heat of the motor set to improve energy efficiency. The technical solution is as follows:

[0006] Embodiments of the present disclosure provide a heating and cooling type air conditioning system, including a refrigeration circuit, a motor heat dissipation circuit, a heating circuit, and an evaporator box. The refrigeration circuit includes a compressor, a first solenoid valve, an external condensation component, a second solenoid valve, a first expansion valve, and an evaporation component that are sequentially connected and form a circuit. The motor heat dissipation circuit is used to be connected in parallel in the motor cooling system of construction machinery. The motor heat dissipation circuit includes a water pump and a heat exchanger that are sequentially connected and form a circuit. The first port of the heat exchanger is connected to the water inlet of the water pump, and the second port of the heat exchanger is connected to the water outlet of the water pump. The heating circuit includes a third solenoid valve, an internal condensation component, a fourth solenoid valve, and a second expansion valve. One end of the third solenoid valve is connected between the compressor and the first solenoid valve, the other end of the third solenoid valve is connected to one end of the internal condensation component, the other end of the internal condensation component is connected between the external condensation component and the second solenoid valve, one end of the fourth solenoid valve is connected between the external condensation component and the second solenoid valve, the other end of the fourth solenoid valve is connected to the third port of the heat exchanger, the second expansion valve is connected between the fourth solenoid valve and the third port of the heat exchanger, and the fourth port of the heat exchanger is connected to the compressor. The evaporator box houses the evaporation component and the internal condensation component.

[0007] In one implementation manner of the present disclosure, the evaporation component includes an evaporator and an evaporation fan. The evaporator is located on one side of the evaporation fan, and the evaporation fan is arranged facing the evaporator.

[0008] In another implementation of the present disclosure, the internal condensation assembly includes an internal condenser and an electric heater. The internal condenser is located on the side of the evaporator away from the evaporation fan. The electric heater is located on the side of the internal condenser away from the evaporator.

[0009] In yet another implementation of the present disclosure, the external condensation assembly includes an external condenser and an external condensation fan. The external condenser is located on one side of the external condensation fan, and the external condensation fan is arranged facing the external condenser.

[0010] In yet another implementation of the present disclosure, the heating and cooling type air conditioning system further includes a liquid receiver dryer. The liquid receiver dryer is connected between the internal condensation assembly and the fourth solenoid valve.

[0011] In yet another implementation of the present disclosure, the heating and cooling type air conditioning system further includes a sight glass. The sight glass is connected between the liquid receiver dryer and the second solenoid valve.

[0012] In yet another implementation of the present disclosure, the heating and cooling type air conditioning system further includes a high-pressure detector and a low-pressure detector. The high-pressure detector is connected between the liquid receiver dryer and the external condensation assembly. The low-pressure detector is connected between the evaporation assembly and the compressor.

[0013] In yet another implementation of the present disclosure, the motor cooling circuit further includes an expansion tank, and the expansion tank is connected between the water pump and the heat exchanger.

[0014] In yet another implementation of the present disclosure, the motor cooling circuit further includes a water tank cooling assembly, and the water tank cooling assembly is connected between the heat exchanger and the water pump.

[0015] In yet another implementation of the present disclosure, the heating and cooling type air conditioning system further includes a temperature sensor, and the temperature sensor is located in the inner cavity of the evaporation box.

[0016] The beneficial effects brought by the technical solution provided by the embodiments of the present disclosure are:

[0017] The heating and cooling air-conditioning system has a cooling mode and a heating mode. When the cooling mode is turned on, the cooling circuit starts to circulate, the first solenoid valve and the second solenoid valve are opened, and the third solenoid valve and the fourth solenoid valve are closed. The refrigerant is compressed by the compressor and becomes a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant passes through the first solenoid valve and flows into the external condensation component to exchange heat with the external environment. After the high-temperature and high-pressure gaseous refrigerant dissipates heat, it becomes a low-temperature and high-pressure liquid refrigerant. The low-temperature and high-pressure liquid refrigerant flows through the second solenoid valve and then into the first expansion valve. After throttling and depressurizing through the first expansion valve, it flows into the evaporation component to exchange heat with the inner cavity of the evaporator box. Since the inner cavity of the evaporator box is connected to the cab, the cold air in the inner cavity of the evaporator box is blown into the cab for cooling. After the low-temperature liquid refrigerant absorbs heat, it becomes a high-temperature gaseous refrigerant and then returns to the compressor to complete the cooling cycle. When the heating mode is turned on, the heating circuit starts to circulate, the third solenoid valve and the fourth solenoid valve are opened, and the first solenoid valve and the second solenoid valve are closed. The refrigerant is compressed by the compressor and becomes a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant passes through the third solenoid valve and flows into the internal condensation component to exchange heat with the inner cavity of the evaporator box. Since the inner cavity of the evaporator box is connected to the cab, the hot air in the inner cavity of the evaporator box is blown into the cab for heating. After the high-temperature and high-pressure gaseous refrigerant dissipates heat, it becomes a low-temperature and high-pressure liquid refrigerant. The low-temperature and high-pressure liquid refrigerant flows through the fourth solenoid valve and then into the second expansion valve. After throttling and depressurizing through the second expansion valve, it flows into the heat exchanger in the motor cooling circuit. The low-temperature liquid refrigerant exchanges heat with the external environment in the heat exchanger and absorbs the heat of the external environment to become a high-temperature gaseous refrigerant. When the external environmental temperature is very low and the heat exchange with the external environment cannot meet the heating requirement, since the motor cooling circuit where the heat exchanger is located is connected in parallel with the motor cooling system of the construction machinery, there is high-temperature coolant that has absorbed the working heat of the motor components of the construction machinery flowing through the heat exchanger, so that the low-temperature liquid refrigerant can exchange heat with the heat exchanger and the high-temperature coolant to increase its temperature and become a high-temperature gaseous refrigerant, ensuring that even when the external temperature is low, the working heat of the operating components of the factory machinery can be used to heat the refrigerant, so that the heating and cooling air-conditioning system can still maintain a good heating effect in a low-temperature environment. The high-temperature gaseous refrigerant finally returns to the compressor to complete a heating cycle.

[0018] That is to say, the heating and cooling air-conditioning system provided by the embodiments of the present disclosure reasonably integrates the cooling circuit, the motor cooling circuit, and the heating circuit, so that even when the external environmental temperature is very low, it can still maintain a good heating effect and utilize the working heat of the motor components of the construction machinery to improve energy efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] To more clearly illustrate the technical solutions in the embodiments of the present disclosure, the following will briefly introduce the accompanying drawings required for the description of the embodiments. Obviously, the accompanying drawings in the following description are only some embodiments of the present disclosure. For those of ordinary skill in the art, without creative efforts, other accompanying drawings can be obtained based on these drawings.

[0020] Figure 1 It is a schematic framework diagram of a heating and cooling air-conditioning system provided by an embodiment of the present disclosure.

[0021] The meanings of the symbols in the figure are as follows:

[0022] 10. Refrigeration circuit;

[0023] 110. Compressor; 120. First solenoid valve; 130. External condensation assembly; 131. External condenser; 132. External condensation fan; 140. Second solenoid valve; 150. First expansion valve; 160. Evaporation assembly; 161. Evaporator; 162. Evaporation fan;

[0024] 20. Motor heat dissipation circuit;

[0025] 210. Water pump; 220. Heat exchanger; 230. Expansion tank; 240. Water tank heat dissipation assembly; 241. Water tank radiator; 242. Water tank fan; 243. Water tank temperature sensor;

[0026] 30. Heating circuit;

[0027] 310. Third solenoid valve; 320. Internal condensation assembly; 321. Internal condenser; 322. Electric heater; 330. Fourth solenoid valve; 340. Second expansion valve;

[0028] 40. Evaporation box;

[0029] 50. Liquid receiver dryer;

[0030] 60. Sight glass;

[0031] 70. High-pressure detector;

[0032] 80. Low-pressure detector;

[0033] 90. Temperature control module;

[0034] 910. Temperature sensor; 920. Controller;

[0035] 100. Motor assembly;

[0036] 101. Motor; 102. Motor controller. Detailed implementation manners

[0037] To make the objectives, technical solutions, and advantages of the present disclosure more apparent, the following further describes the embodiments of the present disclosure in detail with reference to the accompanying drawings.

[0038] The embodiment of the present disclosure provides a heating and cooling air-conditioning system. Figure 1 It is a schematic framework diagram of a heating and cooling air-conditioning system provided by an embodiment of the present disclosure. As Figure 1 shown, the heating and cooling air-conditioning system includes a refrigeration circuit 10, a motor cooling circuit 20, a heating circuit 30, and an evaporator 40. The refrigeration circuit 10 includes a compressor 110, a first solenoid valve 120, an external condensing assembly 130, a second solenoid valve 140, a first expansion valve 150, and an evaporation assembly 160 that are sequentially connected and form a circuit. The motor cooling circuit 20 is used to be connected in parallel to the motor cooling system of construction machinery. The motor cooling circuit 20 includes a water pump 210 and a heat exchanger 220 that are sequentially connected and form a circuit. The first port of the heat exchanger 220 is connected to the water inlet of the water pump 210, and the second port of the heat exchanger 220 is connected to the water outlet of the water pump 210. The heating circuit 30 includes a third solenoid valve 310, an internal condensing assembly 320, a fourth solenoid valve 330, and a second expansion valve 340. One end of the third solenoid valve 310 is connected between the compressor 110 and the first solenoid valve 120, the other end of the third solenoid valve 310 is connected to one end of the internal condensing assembly 320, the other end of the internal condensing assembly 320 is connected between the external condensing assembly 130 and the second solenoid valve 140, one end of the fourth solenoid valve 330 is connected between the external condensing assembly 130 and the second solenoid valve 140, the other end of the fourth solenoid valve 330 is connected to the third port of the heat exchanger 220, and the second expansion valve 340 is connected between the fourth solenoid valve 330 and the third port of the heat exchanger 220. The fourth port of the heat exchanger 220 is connected to the compressor 110. The evaporator 40 houses the evaporation assembly 160 and the internal condensing assembly 320.

[0039] The heating and cooling air-conditioning system has a refrigeration mode and a heating mode. When the refrigeration mode is turned on, the refrigeration circuit 10 starts to circulate, the first solenoid valve 120 and the second solenoid valve 140 are opened, and the third solenoid valve 310 and the fourth solenoid valve 330 are closed. The refrigerant is compressed by the compressor 110 and becomes a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant passes through the first solenoid valve 120 and flows into the external condensing assembly 130 for heat exchange with the external environment. After the high-temperature and high-pressure gaseous refrigerant dissipates heat, it becomes a low-temperature and high-pressure liquid refrigerant. The low-temperature and high-pressure liquid refrigerant flows through the second solenoid valve 140 and then into the first expansion valve 150. After passing through the first expansion valve 150 for throttling and pressure reduction, it flows into the evaporation assembly 160 for heat exchange with the inner cavity of the evaporator 40. Since the inner cavity of the evaporator 40 is connected to the cab, the cold air in the inner cavity of the evaporator 40 will be blown into the cab for refrigeration. After the low-temperature liquid refrigerant absorbs heat and becomes a high-temperature gaseous refrigerant, it returns to the compressor 110 to complete the refrigeration cycle.

[0040] When the heating mode is turned on, the heating circuit 30 starts to circulate, the third solenoid valve 310 and the fourth solenoid valve 330 are opened, and the first solenoid valve 120 and the second solenoid valve 140 are closed. The refrigerant is compressed by the compressor 110 and becomes a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant passes through the third solenoid valve 310 and flows into the inner condensation assembly 320 to exchange heat with the inner cavity of the evaporator 40. Since the inner cavity of the evaporator 40 is connected to the cab, the hot air in the inner cavity of the evaporator 40 is blown into the cab for heating. After the high-temperature and high-pressure gaseous refrigerant dissipates heat, it becomes a low-temperature and high-pressure liquid refrigerant. The low-temperature and high-pressure liquid refrigerant flows into the second expansion valve 340 after passing through the fourth solenoid valve 330. After passing through the second expansion valve 340 for throttling and pressure reduction, it flows into the heat exchanger 220 in the motor cooling circuit 20. The low-temperature liquid refrigerant exchanges heat with the external environment in the heat exchanger 220 and absorbs the heat of the external environment to become a high-temperature gaseous refrigerant. When the external environment temperature is relatively low and the heat exchange with the external environment cannot meet the heating requirement, since the motor cooling circuit 20 where the heat exchanger 220 is located is connected in parallel with the motor cooling system of the construction machinery, there is high-temperature coolant that has absorbed the working heat of the motor assembly 100 of the construction machinery flowing through the heat exchanger 220. This enables the low-temperature liquid refrigerant to exchange heat with the heat exchanger 220 and the high-temperature coolant to be heated up to become a high-temperature gaseous refrigerant, ensuring that even when the external temperature is low, the working heat of the motor assembly 100 of the construction machinery can be used to heat the refrigerant, so that the heating and cooling air-conditioning system can maintain a good heating effect in a low-temperature environment. Finally, the high-temperature gaseous refrigerant returns to the compressor 110 to complete a heating cycle.

[0041] That is to say, the heating and cooling air-conditioning system provided by the embodiments of the present disclosure reasonably integrates the refrigeration circuit 10, the motor cooling circuit 20, and the heating circuit 30, so that even when the external environment temperature is very low, a good heating effect can still be maintained, and the working heat of the motor assembly 100 of the construction machinery is used to improve the energy efficiency.

[0042] In this embodiment, the motor assembly 100 of the construction machinery is connected in series on the motor cooling circuit 20, and the motor assembly 100 is connected between the water pump 210 and the heat exchanger 220.

[0043] It should be noted that the coolant flows out of the water pump 210 and passes through the motor assembly 100. The coolant absorbs the heat of the motor assembly 100 for heat dissipation and becomes high-temperature coolant and then flows into the heat exchanger 220, thereby exchanging the heat absorbed by the motor assembly 100 into the heating circuit 30 and making full use of the heat generated by the motor assembly 100 for heating. Therefore, a good heating effect can still be maintained when the external environment temperature is very low.

[0044] Optionally, the motor assembly 100 is a motor 101 or a motor controller 102 that operates at high power on the device. These motor assemblies 100 have long working hours, high power consumption, and high working power, generating a large amount of heat that needs to be dissipated in a timely manner to ensure the normal operation of the device.

[0045] In this embodiment, the evaporation assembly 160 includes an evaporator 161 and an evaporation fan 162. The evaporator 161 is located on one side of the evaporation fan 162, and the evaporation fan 162 is arranged facing the evaporator 161.

[0046] Exemplarily, since the evaporation fan 162 is arranged facing the evaporator 161 and the evaporator 161 is located in the evaporation box 40 communicating with the cab, the evaporator 161 can convert the liquid refrigerant into a gaseous refrigerant to absorb heat and refrigerate, and then the evaporation fan 162 blows the refrigerated gas from the evaporation box 40 into the cab, thus achieving the refrigeration effect.

[0047] In this embodiment, the internal condensation assembly 320 includes an internal condenser 321 and an electric heater 322. The internal condenser 321 is located on the side of the evaporator 161 away from the evaporation fan 162. The electric heater 322 is located on the side of the internal condenser 321 away from the evaporator 161.

[0048] Exemplarily, since the internal condenser 321 is located on the side of the evaporator 161 away from the evaporation fan 162, the internal condenser 321 can convert the high-temperature gaseous refrigerant into a low-temperature liquid refrigerant to release heat and heat, and then the evaporation fan 162 also located in the evaporation box 40 and facing the internal condenser 321 blows the heated gas into the cab, thus achieving the heating effect. The electric heater 322 located in the evaporation box 40 serves as an auxiliary heating component and is turned on to heat the cab when the heating function weakens or is lost. Therefore, when the external environmental temperature is very low, the heating and cooling air-conditioning system can still maintain a good heating effect.

[0049] It is worth noting that the heating power of the electric heater 322 is divided into three gears: high, medium, and low, and can be adjusted according to the heating requirements.

[0050] In this embodiment, the external condensation assembly 130 includes an external condenser 131 and an external condensation fan 132. The external condenser 131 is located on one side of the external condensation fan 132, and the external condensation fan 132 is arranged facing the external condenser 131.

[0051] Exemplarily, since the external condensation fan 132 is arranged facing the external condenser 131, after the high-temperature gaseous refrigerant flows into the external condenser 131, it can exchange heat with the external environment under the action of the external condensation fan 132, and the high-temperature gaseous refrigerant dissipates heat and becomes a low-temperature liquid refrigerant.

[0052] In this embodiment, the heating and cooling air-conditioning system further includes a liquid receiver dryer 50. The liquid receiver dryer 50 is connected between the inner condensation component 320 and the fourth solenoid valve 330.

[0053] Exemplarily, after the refrigerant is cooled by the inner condenser 321 or the outer condenser 131, moisture is likely to be generated in the system. There is a dryer and a filter screen in the liquid receiver dryer 50, which can absorb the excess moisture in the refrigerant and filter out impurities when the refrigerant flows through the liquid receiver dryer 50, ensuring the smooth operation of the entire system.

[0054] In this embodiment, the heating and cooling air-conditioning system further includes a sight glass 60. The sight glass 60 is connected between the liquid receiver dryer 50 and the second solenoid valve 140.

[0055] Exemplarily, the sight glass 60 is connected between the liquid receiver dryer 50 and the second solenoid valve 140, and the sight glass 60 can be used to observe the condition of the refrigerant and the water content in the refrigerant.

[0056] In this embodiment, the heating and cooling air-conditioning system further includes a high-pressure detector 70 and a low-pressure detector 80. The high-pressure detector 70 is connected between the liquid receiver dryer 50 and the outer condensation component 130. The low-pressure detector 80 is connected between the evaporation component 160 and the compressor 110. The heating and cooling air-conditioning system further includes a temperature control module 90, which includes a temperature sensor 910 and a controller 920. The temperature control module 90 is located in the evaporator 40. The compressor 110, the high-pressure detector 70, the low-pressure detector 80, and the temperature sensor 910 are all electrically connected to the controller 920.

[0057] Exemplarily, the high-pressure detector 70 is connected between the liquid receiver dryer 50 and the outer condensation component 130 to monitor the high-pressure operating pressure of the compressor 110. The low-pressure detector 80 is connected between the evaporation component 160 and the compressor 110 to monitor the low-pressure operating pressure of the compressor 110. The monitored operating pressure signal is converted into an electrical signal and transmitted to the controller 920. Since the controller 920 is electrically connected to the compressor 110, the controller 920 can reasonably control the operating speed of the compressor 110 according to the electrical signal received from the high-pressure detector 70 or the low-pressure detector 80, thereby achieving temperature control. The temperature sensor 910 can monitor the temperature in the evaporator 40 and convert the received temperature signal into an electrical signal and transmit it to the controller 920. The controller 920 can adjust the operating speed of the compressor 110 according to the electrical signal received from the temperature sensor 910, thereby achieving temperature adjustment in the evaporator 40.

[0058] In this embodiment, the motor cooling circuit 20 further includes an expansion tank 230. The expansion tank 230 is connected between the water pump 210 and the heat exchanger 220.

[0059] Since the water pressure of the coolant in the motor cooling circuit 20 is affected by temperature, when the water pressure of the coolant in the motor cooling circuit 20 is too high, the expansion tank 230 can recover part of the coolant, reducing the water pressure of the coolant in the motor cooling circuit 20. When the water pressure of the coolant in the motor cooling circuit 20 is too low, the expansion tank 230 can output part of the coolant, increasing the water pressure of the coolant in the motor cooling circuit 20, thus ensuring that there is always sufficient coolant in the motor cooling circuit 20.

[0060] In this embodiment, the motor cooling circuit 20 further includes a water tank cooling assembly 240, and the water tank cooling assembly 240 is connected between the heat exchanger 220 and the water pump 210. The water tank cooling assembly 240 includes a water tank radiator 241 and a water tank fan 242. The water tank radiator 241 is located on one side of the water tank fan 242, and the water tank fan 242 is arranged facing the water tank radiator 241.

[0061] Exemplarily, when the coolant for cooling the motor assembly 100 flows through the water tank radiator 241, it can exchange heat with the external environment under the action of the water tank fan 242 and achieve heat dissipation.

[0062] In this embodiment, the water tank cooling assembly 240 further includes two water tank temperature sensors 243. One water tank temperature sensor 243 is connected between the water tank radiator 241 and the water pump 210, and the other water tank temperature sensor 243 is connected between the water tank radiator 241 and the heat exchanger 220. Both water tank temperature sensors 243 are electrically connected to the controller 920.

[0063] Exemplarily, since the controller 920 can receive the temperature signals transmitted by the two water tank temperature sensors 243 located at the inlet and outlet of the water tank radiator 241, the controller 920 can judge and evaluate the heating effect of the motor cooling circuit 20 according to the received temperature signals of the water tank temperature sensors 243, and convert the temperature signals into electrical signals and transmit them to the electric heater 322. When the heating effect of the motor cooling circuit 20 is low, increase the power of the electric heater 322. When the heating effect of the motor cooling circuit 20 is high, reduce the power of the electric heater 322. Thus, while maintaining a good heating effect, the heating circuit 30 can also reduce energy consumption.

[0064] In this embodiment, the cooling and heating type air - conditioning system also has a dehumidification mode and a defrosting mode, which are introduced below respectively.

[0065] When the dehumidification mode is turned on, the first solenoid valve 120, the second solenoid valve 140, and the third solenoid valve 310 are opened, and the fourth solenoid valve 330 is closed. The compressor 110 compresses the refrigerant into a high-temperature and high-pressure gaseous refrigerant. The high-temperature and high-pressure gaseous refrigerant is respectively pressed into the external condensation assembly 130 and the internal condensation assembly 320, and dissipates heat to become a low-temperature liquid refrigerant. The low-temperature liquid refrigerant flows into the evaporation assembly 160 to absorb heat and become a high-temperature gaseous refrigerant, and the air in the evaporation box 40 is frozen and dehumidified. The air frozen and dehumidified in the evaporation box 40 is heated by the internal condensation assembly 320 and then transmitted to the cab. Thus, the wet air in the cab is frozen and dehumidified by the evaporator 161 and then heated by the indoor condenser 321, which can prevent cold air from directly blowing on the driver.

[0066] When the defrosting mode is turned on, on the basis of turning on the aforementioned heating mode, the system simultaneously starts the electric heater 322 to achieve rapid heating and blow away the frost on the cab glass.

[0067] The above are only optional embodiments of the present disclosure, and are not intended to limit the present disclosure. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present disclosure shall be included in the protection scope of the present disclosure.

Claims

1. A cooling and heating air conditioning system, characterized in that: It comprises a refrigeration circuit (10), a motor heat dissipation circuit (20), a heating circuit (30) and an evaporation box (40); The refrigeration circuit (10) comprises a compressor (110), a first solenoid valve (120), an external condensing component (130), a second solenoid valve (140), a first expansion valve (150) and an evaporating component (160) which are connected in sequence to form a circuit; The motor heat dissipation circuit (20) is used to be connected in parallel to a motor cooling system of an engineering machine, and the motor heat dissipation circuit (20) comprises a water pump (210) and a heat exchanger (220) which are connected in sequence to form a circuit, a first port of the heat exchanger (220) is connected to a water inlet of the water pump (210), and a second port of the heat exchanger (220) is connected to a water outlet of the water pump (210); The heating circuit (30) comprises a third solenoid valve (310), an inner condensing assembly (320), a fourth solenoid valve (330) and a second expansion valve (340); one end of the third solenoid valve (310) is connected between the compressor (110) and the first solenoid valve (120); the other end of the third solenoid valve (310) is connected to one end of the inner condensing assembly (320); the other end of the inner condensing assembly (320) is connected to between the outer condensing assembly (130) and the second solenoid valve (140); one end of the fourth solenoid valve (330) is connected to between the outer condensing assembly (130) and the second solenoid valve (140); the other end of the fourth solenoid valve (330) is connected to a third port of the heat exchanger (220); the second expansion valve (340) is connected between the fourth solenoid valve (330) and the third port of the heat exchanger (220); and the fourth port of the heat exchanger (220) is connected to the compressor (110); The evaporation box (40) accommodates the evaporation component (160) and the internal condensation component (320).

2. The cooling and heating air conditioning system according to claim 1, characterized in that: The evaporation component (160) includes an evaporator (161) and an evaporation fan (162); The evaporator (161) is located on one side of the evaporation fan (162), and the evaporation fan (162) is arranged facing the evaporator (161).

3. The cooling and heating air conditioning system according to claim 2, characterized in that: The internal condensation component (320) includes an internal condenser (221) and an electric heater (222); The inner condenser (221) is located on a side of the evaporator (161) away from the evaporation fan (162); The electric heater (222) is located on a side of the inner condenser (221) away from the evaporator (161).

4. The cooling and heating air conditioning system according to claim 1, characterized in that: The external condensation component (130) comprises an external condenser (131) and an external condensation fan (132); The external condenser (131) is located on one side of the external condensation fan (132), and the external condensation fan (132) is arranged facing the external condenser (131).

5. The cooling and heating air conditioning system according to claim 1, characterized in that: The cooling and heating type air conditioning system further includes a liquid storage dryer (50); The liquid storage drier (50) is connected between the internal condensing assembly (320) and the fourth solenoid valve (330).

6. The cooling and heating air conditioning system according to claim 5, characterized in that: The cooling and heating air conditioning system further includes a sight glass (60); The sight glass (60) is connected between the liquid storage drier (50) and the second solenoid valve (140).

7. The cooling and heating air conditioning system according to claim 5, characterized in that: The cooling and heating air conditioning system further comprises a high pressure detector (70) and a low pressure detector (80); The high-pressure detector (70) is connected between the liquid storage dryer (50) and the external condensation component (130); The low pressure detector (80) is connected between the evaporation component (160) and the compressor (110).

8. The cooling and heating air conditioning system according to claim 1, characterized in that: The motor heat dissipation circuit (20) further includes an expansion water tank (230); The expansion water tank (230) is connected between the water pump (210) and the heat exchanger (220).

9. The cooling and heating air conditioning system according to claim 1, characterized in that: The motor heat dissipation circuit (20) further includes a water tank heat dissipation component (240); The water tank heat dissipation component (240) is connected between the heat exchanger (220) and the water pump (210).

10. The cooling and heating air conditioning system according to claim 1, characterized in that: The cooling and heating type air conditioning system further comprises a temperature control module (90), and the temperature control module (90) is located in the inner cavity of the evaporation box (40).

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