Air conditioner outdoor unit heat exchange system and air conditioner

Abstract

According to the air conditioner outdoor unit heat exchange system and air conditioner provided by the application, the air conditioner outdoor unit heat exchange system comprises: a refrigerant circuit, the refrigerant circuit is communicated with an indoor heat exchanger of an air conditioner indoor unit, and a compressor assembly for driving refrigerant movement is arranged on the refrigerant circuit; an open circuit, the open circuit is communicated with an external water source; a closed circuit, a fluid medium in the closed circuit is distilled water, a tube heat exchanger, a plate heat exchanger and a first water pump for driving distilled water flow are arranged on the closed circuit; wherein the distilled water in the closed circuit and the refrigerant of the refrigerant circuit flow through the inner tube and the outer tube of the tube heat exchanger respectively to exchange heat; the fluid medium in the open circuit flows through the plate heat exchanger to exchange heat with the distilled water in the closed circuit. According to the scheme of the application, the water cooling heat exchange purpose can be realized, and the deposition in the water cooling circuit can be prevented, so that the heat exchange efficiency is affected.

Description

TECHNICAL FIELD

[0001] The present application relates to the field of air conditioning technology, and in particular to an air conditioner outdoor unit heat exchange system and an air conditioner. BACKGROUND

[0002] The refrigeration principle of a conventional air conditioner is to compress gaseous refrigerant into high-temperature and high-pressure gas by a compressor, and send it to a condenser for cooling, and after cooling, it becomes liquid refrigerant of medium temperature and high pressure, and the liquid refrigerant of medium temperature is throttled to low-temperature and low-pressure gas-liquid mixture by a throttling component, and then vaporized by absorbing heat from air in an evaporator, and becomes gaseous, and then returns to the compressor for continuous compression and refrigeration.

[0003] In order to meet more use requirements, the field proposes a way of cooling refrigerant by water cooling instead of condenser. However, in order to ensure the cooling effect and reduce the space occupation, a long-stroke coil section is usually arranged in the water cooling system, so that the impurities deposited in the water are easy to accumulate at the pipe corner after long-term use, which reduces the heat exchange effect and affects the service life of the air conditioner. SUMMARY

[0004] The present application provides an air conditioner outdoor unit heat exchange system and an air conditioner to solve the defect that the water cooling method is easy to produce scale and affect the service life of the system in the prior art, and to realize an air conditioner outdoor unit heat exchange scheme with reliable water cooling effect and long service life.

[0005] The present application provides an air conditioner outdoor unit heat exchange system, comprising: a refrigerant circuit, the refrigerant circuit being communicated with an indoor heat exchanger of an air conditioner indoor unit, and a compressor assembly for driving the movement of refrigerant being arranged on the refrigerant circuit; an open circuit, the open circuit being communicated with an external water source; a closed circuit, a fluid medium in the closed circuit being distilled water, a sleeve heat exchanger, a plate heat exchanger, and a first water pump for driving the flow of the distilled water being arranged on the closed circuit; wherein the distilled water in the closed circuit and the refrigerant of the refrigerant circuit flow through the inner tube and the outer tube of the sleeve heat exchanger respectively to exchange heat; the fluid medium in the open circuit flows through the plate heat exchanger to exchange heat with the distilled water in the closed circuit.

[0006] According to the air conditioner outdoor unit heat exchange system provided by the present application, a condenser is arranged on the refrigerant circuit; and the condenser and the sleeve heat exchanger are connected in series or parallel on the refrigerant circuit.

[0007] According to the air conditioner outdoor unit heat exchange system provided by the application, the ventilation chamber has multiple ventilation openings leading to the outside of the air conditioner outdoor unit, and the condenser is arranged at the adjacent position of the ventilation opening; and the fan is used to discharge the air in the ventilation chamber to create a negative pressure environment in the ventilation chamber.

[0008] According to the air conditioner outdoor unit heat exchange system provided by the application, on the refrigerant circuit, the refrigerant discharge side of the compressor assembly is connected with the tube heat exchanger and the condenser through a reversing valve; the reversing valve has the following working states: water cooling state, the reversing valve connects the pipeline between the compressor assembly and the tube heat exchanger, and disconnects the pipeline between the compressor assembly and the condenser; air cooling state, the reversing valve disconnects the pipeline between the compressor assembly and the tube heat exchanger, and connects the pipeline between the compressor assembly and the condenser; and comprehensive heat exchange state, the reversing valve connects the pipeline between the compressor assembly and the tube heat exchanger, and connects the pipeline between the compressor assembly and the condenser.

[0009] According to the air conditioner outdoor unit heat exchange system provided by the application, the open circuit is provided with a water storage tank and a second water pump; the second water pump is used to draw water from the water storage tank and inject the water into the water storage tank after circulating along the open circuit.

[0010] According to the air conditioner outdoor unit heat exchange system provided by the application, the water storage tank is provided with a water inlet connected with a tap water pipe and / or an air conditioner condensate water drain pipe, and a water outlet connected with a domestic water system.

[0011] According to the air conditioner outdoor unit heat exchange system provided by the application, the closed circuit and the open circuit are respectively provided with water temperature sensors, and the first water pump and the second water pump are variable frequency pumps, so that the working power of the first water pump and / or the second water pump can be adjusted according to the change of the water temperature on the closed circuit and the open circuit.

[0012] According to the air conditioner outdoor unit heat exchange system provided by the application, on the closed circuit, the flow direction of the distilled water is from the tube heat exchanger to the plate heat exchanger; and the tube heat exchanger and the plate heat exchanger are connected in series with an intermediate container.

[0013] According to the air conditioner outdoor unit heat exchange system provided by the application, the volume of the distilled water in the closed circuit is less than the total volume on the closed circuit, and the difference between the volume of the distilled water and the total volume is less than the volume of the intermediate container.

[0014] The intermediate container is provided with a sealable water injection port and a water discharge port, which are used for injecting distilled water into the closed loop or discharging distilled water in the closed loop.

[0015] The application further provides an air conditioner comprising an air conditioner indoor unit and an air conditioner outdoor unit, wherein the air conditioner outdoor unit is provided with the air conditioner outdoor unit heat exchange system as described above.

[0016] The air conditioner outdoor unit heat exchange system and the air conditioner provided by the application can maintain the low temperature of the distilled water in the closed loop by heat exchange between the low-temperature water source in the open loop and the distilled water in the closed loop in the plate heat exchanger. The low-temperature distilled water in the closed loop can absorb the heat of the refrigerant in the refrigerant circuit by heat exchange between the low-temperature distilled water and the refrigerant in the refrigerant circuit in the double-pipe heat exchanger, thereby achieving the cooling effect. Since the closed loop is not in contact with the outside world and the distilled water is basically free of impurities, the formation of scale can be prevented for a long time, thereby ensuring the cooling effect and prolonging the service life of the heat exchange system. BRIEF DESCRIPTION OF DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the application or the prior art, the following will briefly introduce the drawings needed to be used in the embodiments or the prior art description. Obviously, the drawings in the following description are some embodiments of the application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0018] Figure 1 Fig. 1 is a partial structural schematic view of the air conditioner outdoor unit heat exchange system provided by the application;

[0019] Figure 2 Fig. 2 is a schematic view of the pipeline structure of the air conditioner outdoor unit heat exchange system provided by the application.

[0020] Reference signs:

[0021] Double-pipe heat exchanger 11; plate heat exchanger 12; first water pump 13; intermediate container 14; compressor assembly 21; condenser 22; ventilation chamber 23; fan 24; water storage tank 31; second water pump 32; water inlet 33; water outlet 34. DETAILED DESCRIPTION

[0022] In order to make the objects, technical solutions and advantages of the application clearer, the technical solutions in the application will be described clearly and completely below in combination with the drawings in the application. Obviously, the described embodiments are some embodiments of the application, rather than all the embodiments. Based on the embodiments in the application, all other embodiments obtained by those skilled in the art without any creative effort belong to the protection scope of the application.

[0023] Traditionally, the refrigerant is cooled by water cooling instead of condenser, in order to ensure the cooling effect and reduce the space occupation, the water cooling system usually needs to set the coil section with long stroke, so that the impurities deposited in the water are easy to accumulate in the pipe corner after long-term use, resulting in the decrease of heat exchange effect and affecting the service life of the air conditioner. In view of this, the present application provides an air conditioner outdoor unit heat exchange system and air conditioner. Among them, as shown in Figure 1 and Figure 2 The air conditioner outdoor unit heat exchange system exchanges heat between the low-temperature water source in the open loop and the distilled water in the closed loop in the plate heat exchanger 12, so as to maintain the low temperature of the distilled water in the closed loop. The low-temperature distilled water in the closed loop exchanges heat with the refrigerant in the refrigerant circuit in the double-pipe heat exchanger 11, so as to absorb the heat of the refrigerant and achieve the cooling effect. Since the closed loop is not in contact with the outside world at all times, and the distilled water is basically free of impurities, the formation of scale can be prevented for a long time, thereby ensuring the cooling effect and improving the service life of the heat exchange system.

[0024] In order to better understand the technical solutions of the present application, the following will describe the air conditioner outdoor unit heat exchange system and air conditioner of the present application in conjunction with the drawings and detailed description of each specific embodiment.

[0025] According to the air conditioner outdoor unit heat exchange system provided by the present application, as shown in Figure 1 and Figure 2 The refrigerant circuit is connected to the indoor heat exchanger of the air conditioner indoor unit, and a compressor assembly 21 is arranged on the refrigerant circuit for driving the movement of the refrigerant. The open loop is connected to the external water source. The fluid medium in the closed loop is distilled water, and the closed loop is provided with a double-pipe heat exchanger 11, a plate heat exchanger 12, and a first water pump 13 for driving the flow of distilled water. The distilled water in the closed loop and the refrigerant in the refrigerant circuit flow through the inner pipe and the outer pipe of the double-pipe heat exchanger 11 respectively to exchange heat. The fluid medium in the open loop flows through the plate heat exchanger 12 to exchange heat with the distilled water in the closed loop.

[0026] As shown in Figure 2 The three types of arrows respectively represent the movement of the medium in the refrigerant circuit, the closed loop and the open loop. The closed loop is not in direct contact with the outside world and the medium in the refrigerant circuit and the open loop, thereby avoiding the entry of external impurities into the closed loop. The medium in the closed loop is distilled water which is basically free of impurities, thereby avoiding the formation of scale in the closed loop for a long time.

[0027] The compressor assembly 21 mainly includes a compressor for converting low-temperature and low-pressure refrigerant gas in the refrigerant circuit into high-temperature and high-pressure refrigerant gas, and a matched gas-liquid separator and valve assembly. In the double-pipe heat exchanger 11, the inner pipe and the outer pipe are connected to the refrigerant circuit and the closed circuit respectively, so that the distilled water and the refrigerant complete heat exchange in the inner pipe and the outer pipe of the double-pipe heat exchanger 11. In the plate heat exchanger 12, the low-temperature water flowing from the outside in the open circuit can absorb the heat of the distilled water in the closed circuit, so that the distilled water in the closed circuit always maintains a lower temperature, thereby maintaining reliable refrigerant cooling effect. The first water pump 13 is used to drive the distilled water to maintain a circulating state in the closed circuit. Under different refrigeration mode requirements, the distilled water temperature in the closed circuit can be further reduced by increasing the water flow rate in the open circuit, thereby improving the cooling effect. In addition, the working power of the first water pump 13 can also be adjusted to adjust the flow rate of the distilled water in the closed circuit, so as to adjust the heat exchange efficiency of the distilled water and the refrigerant in the double-pipe heat exchanger 11. Preferably, in the double-pipe heat exchanger 11, the movement directions of the distilled water and the refrigerant in the inner pipe and the outer pipe are always opposite, so that the temperature difference between the distilled water and the refrigerant can always be maintained during the heat exchange process, thereby maintaining stable heat exchange effect.

[0028] According to the air conditioner outdoor unit heat exchange system provided by the application, the condenser 22 is preferably further included, as shown in Figure 1 and Figure 2 The condenser 22 is arranged on the refrigerant circuit. The condenser 22 and the double-pipe heat exchanger 11 are connected in series or in parallel on the refrigerant circuit, so that the condenser 22 and the water cooling system can work together to reduce the cooling pressure of either one. When the condenser 22 and the double-pipe heat exchanger 11 are connected in series on the refrigerant circuit, the high-temperature and high-pressure refrigerant gas discharged from the compressor assembly 21 is cooled by the condenser 22 and the double-pipe heat exchanger 11 in sequence, which can achieve better cooling effect. When the condenser 22 and the double-pipe heat exchanger 11 are connected in parallel on the refrigerant circuit, the high-temperature and high-pressure refrigerant gas discharged from the compressor assembly 21 is cooled by the condenser 22 and the double-pipe heat exchanger 11 respectively, which can improve the overall cooling efficiency of the system, and even under the condition of meeting the cooling demand, the space size of the cooling equipment can be appropriately reduced.

[0029] According to the air conditioner outdoor unit heat exchange system provided by the application, as shown in Figure 1As shown, the air conditioner outdoor unit comprises a ventilation chamber 23 and a fan 24. The ventilation chamber 23 has a plurality of ventilation openings opening to the outside of the air conditioner outdoor unit, and the condenser 22 is arranged adjacent to the ventilation openings. The fan 24 is used to exhaust the air in the ventilation chamber 23 to create a negative pressure environment in the ventilation chamber 23. When the fan 24 is working, the air in the ventilation chamber 23 is drawn out by the rotating fan blades, at this time, a negative pressure state is formed in the ventilation chamber 23, and the outside air enters the ventilation chamber 23 through the ventilation openings adjacent to the condenser 22. In the process of the air passing through the condenser 22, the heat of the refrigerant in the condenser 22 is absorbed by the flowing air, realizing air cooling.

[0030] Preferably, the tube heat exchanger 11, the condenser 22 and the compressor assembly 21 are all arranged in the ventilation chamber 23, so that in the process of the operation of the fan 24, the flowing air not only exchanges heat with the condenser 22, but also improves the temperature environment around the tube heat exchanger 11 and the compressor assembly 21, reducing the adverse effects of high temperature environment on the distilled water in the closed circuit and the compressor assembly 21. Based on the natural law of hot air rising, the ventilation openings of the ventilation chamber 23 are preferably arranged on the side and / or bottom of the cabinet of the air conditioner outdoor unit, and the fan 24 is preferably arranged on the top of the cabinet of the air conditioner outdoor unit.

[0031] According to the heat exchange system of the air conditioner outdoor unit provided by the present application, on the refrigerant circuit, the refrigerant discharge side of the compressor assembly 21 is connected to the tube heat exchanger 11 and the condenser 22 through the reversing valve respectively, so that the cooling process of the refrigerant in the tube heat exchanger 11 and the condenser 22 can be controlled through the reversing valve. The reversing valve preferably has the following working states:

[0032] Water cooling state, the reversing valve connects the pipeline between the compressor assembly 21 and the tube heat exchanger 11, and closes the pipeline between the compressor assembly 21 and the condenser 22. At this time, the refrigerant in the refrigerant circuit only exchanges heat with the distilled water in the closed circuit through the tube heat exchanger 11. The fan 24 stops working to save energy consumption; or it can also only work at a lower power to keep the air in the ventilation chamber 23 circulating.

[0033] Air cooling state, the reversing valve closes the pipeline between the compressor assembly 21 and the tube heat exchanger 11, and connects the pipeline between the compressor assembly 21 and the condenser 22. At this time, the refrigerant in the refrigerant circuit only exchanges heat with the circulating air in the ventilation chamber 23 through the condenser 22. The fan 24 keeps working at a high power to ensure that the air circulation speed in the ventilation chamber 23 meets the refrigerant cooling requirements. The various power devices on the closed circuit and the open circuit can stop working to save energy consumption, and at this time, the water cooling heat exchange system of the air conditioner outdoor unit can be maintained without affecting the operation of the air conditioner.

[0034] In the comprehensive heat exchange state, the reversing valve connects the pipeline between the compressor assembly 21 and the tube heat exchanger 11 and connects the pipeline between the compressor assembly 21 and the condenser 22, so that the air cooling and water cooling heat exchange are simultaneously performed, and the heat exchange efficiency of the entire heat exchange system is improved.

[0035] According to the above water cooling state, air cooling state and comprehensive heat exchange state, the heat exchange system of the air conditioner outdoor unit can be controlled to operate in different states under different environments. For example, when the air temperature in the outdoor environment is high, the air cooling cannot fully play the cooling effect, and at this time, the system is preferably operated in the water cooling state. It can be understood that based on the switching function of different heat exchange states, the heat exchange system of the air conditioner outdoor unit of the present application can adapt to more environmental conditions of the air conditioner operation.

[0036] In any of the above embodiments, the external water source connected by the open loop can be tap water. Tap water generally has a relatively low temperature because it circulates in the urban underground pipe network, which meets the cooling requirements of the heat exchange system. In use, the water pressure of the tap water pipeline can make it move along the open loop without driving. The flow rate of tap water in the open loop can be controlled by the water valve to adjust the heat exchange efficiency of the distilled water in the plate heat exchanger 12. The water outlet of the open loop can be connected to the domestic water system to fully utilize water resources.

[0037] According to the heat exchange system of the air conditioner outdoor unit provided by the present application, the open loop can also be supplied with water by an external water storage device. Figure 2 As shown in the figure, the open loop is preferably provided with a water storage tank 31 and a second water pump 32; the second water pump 32 is used to draw water from the water storage tank 31 and inject it into the water storage tank 31 after circulating along the open loop for one cycle. The water storage tank 31 also has a water inlet 33 connected to the tap water pipe and / or the air conditioner condensate drain pipe and a water outlet 34 connected to the domestic water system, so that new low-temperature water can be injected into the water storage tank 31 through the water inlet 33, and when the water temperature in the water storage tank 31 rises to not meet the use requirements of the heat exchange system, the water with higher temperature can be discharged to the domestic water system through the water outlet 34. The water storage tank 31 can be buried underground or placed in a low-temperature area such as a cellar, so that the low water temperature in the water storage tank 31 can be maintained for a long time, realizing the recycling of water in the open loop and reducing consumption.

[0038] According to the air conditioner outdoor unit heat exchange system provided by the present application, water temperature sensors are arranged on the closed loop and the open loop respectively, and the first water pump 13 and the second water pump 32 are preferably variable frequency pumps, so as to adjust the working power of the first water pump 13 and / or the second water pump 32 according to the water temperature change on the closed loop and the open loop. For example, the working power of the first water pump 13 can be adjusted, so as to adjust the cooling efficiency of the distilled water in the closed loop on the refrigerant in the tube heat exchanger 11; and the working power of the second water pump 32 can be adjusted, so as to adjust the heat exchange efficiency of the water in the open loop and the distilled water in the closed loop in the plate heat exchanger 12. In actual use, the electric control element can receive the detection parameters of the water temperature sensors, so as to control the first water pump 13 and the second water pump 32 to adjust the working power, so as to realize dynamic automatic regulation and control of the cooling effect.

[0039] According to the air conditioner outdoor unit heat exchange system provided by the present application, the flow direction of the distilled water on the closed loop is from the tube heat exchanger 11 to the plate heat exchanger 12, and the intermediate container 14 is connected in series between the tube heat exchanger 11 and the plate heat exchanger 12. As shown in Figure 1 and Figure 2 As shown in the drawings, during the starting and stopping process of the first water pump 13, the distilled water will impact the pipeline of the closed loop due to the inertial effect. The impact effect cannot be eliminated by the pipeline alone, and leakage may occur on the loop. According to the present application, the intermediate container 14 is arranged at the downstream position of the tube heat exchanger 11 and the upstream position of the plate heat exchanger 12, so as to reduce the impact effect of the water flow inertia.

[0040] Preferably, the volume of the distilled water in the closed loop is less than the total volume on the closed loop, and the difference between the volume of the distilled water and the total volume is less than the volume of the intermediate container 14. Through the volume space of the difference, the pressure effect on the closed loop can be reduced when the volume of the distilled water changes with the temperature, and the safety and reliability of the pipeline and the pipeline connection structure are further improved.

[0041] Further, according to the air conditioner outdoor unit heat exchange system provided by the present application, the intermediate container 14 is preferably provided with a sealable water inlet and a water outlet (not shown in the drawings), which are used for injecting distilled water into the closed loop or discharging distilled water in the closed loop.

[0042] The air conditioner provided by the present application is described below, and the air conditioner described below can be correspondingly referred to the air conditioner outdoor unit heat exchange system described above.

[0043] The application further provides an air conditioner, comprising an air conditioner indoor unit and an air conditioner outdoor unit, wherein the air conditioner outdoor unit is provided with an air conditioner outdoor unit heat exchange system, the air conditioner outdoor unit heat exchange system comprising: a refrigerant circuit, the refrigerant circuit being connected to an indoor heat exchanger of the air conditioner indoor unit, and the refrigerant circuit being provided with a compressor assembly 21 for driving the movement of refrigerant; an open circuit, the open circuit being connected to an external water source; a closed circuit, a fluid medium in the closed circuit being distilled water, and the closed circuit being provided with a tube heat exchanger 11, a plate heat exchanger 12, and a first water pump 13 for driving the flow of distilled water; wherein the distilled water in the closed circuit and the refrigerant of the refrigerant circuit flow through the inner tube and the outer tube of the tube heat exchanger 11 respectively to exchange heat; and the fluid medium in the open circuit flows through the plate heat exchanger 12 to exchange heat with the distilled water in the closed circuit.

[0044] It can be understood that the air conditioner outdoor unit heat exchange system of the air conditioner can be the air conditioner outdoor unit heat exchange system of any one of the foregoing embodiments. The air conditioner outdoor unit of the air conditioner exchanges heat with the distilled water in the closed circuit in the plate heat exchanger 12 through the external low-temperature water source in the open circuit, so as to maintain a lower temperature of the distilled water in the closed circuit. The distilled water in the closed circuit exchanges heat with the refrigerant in the refrigerant circuit in the tube heat exchanger 11, so as to absorb the heat of the refrigerant and achieve a cooling effect. Since the closed circuit is always not in contact with the outside world, and the distilled water is basically free of impurities, the formation of scale can be prevented for a long time, the cooling effect is ensured, and the service life of the heat exchange system is improved.

[0045] Finally, it should be noted that the above examples are only used to illustrate the technical solutions of the present application, and not to limit them; although the present application has been described in detail with reference to the foregoing examples, those skilled in the art should understand that they can still modify the technical solutions recorded in the foregoing examples, or make equivalent replacements for some technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present application.

Claims

1. An air conditioner outdoor unit heat exchange system, characterized in that, The application relates to a refrigerant circuit, an open circuit and a closed circuit. The refrigerant circuit is connected with an indoor heat exchanger of an air conditioner, and is provided with a compressor assembly (21) for driving refrigerant movement. The open circuit is connected with an external water source. The closed circuit is filled with distilled water, and is provided with a double-pipe heat exchanger (11), a plate heat exchanger (12) and a first water pump (13) for driving the distilled water flow. The distilled water in the closed circuit and the refrigerant in the refrigerant circuit flow through the inner pipe and the outer pipe of the double-pipe heat exchanger (11) respectively to exchange heat; the fluid medium in the open circuit flows through the plate heat exchanger (12) to exchange heat with the distilled water in the closed circuit. In the closed circuit, the flow direction of the distilled water is from the double-pipe heat exchanger (11) to the plate heat exchanger (12). The double-pipe heat exchanger (11) and the plate heat exchanger (12) are connected in series with an intermediate container (14). The volume of the distilled water in the closed circuit is less than the total volume of the closed circuit, and the difference between the volume of the distilled water and the total volume is less than the volume of the intermediate container (14).

2. The heat exchange system of the outdoor unit of an air conditioner according to claim 1, wherein The refrigerant circuit is provided with a condenser (22). The condenser (22) and the double-pipe heat exchanger (11) are connected in series or parallel on the refrigerant circuit.

3. The heat exchange system of the outdoor unit of an air conditioner according to claim 2, wherein The application further relates to a ventilation chamber (23) and a fan (24). The ventilation chamber (23) has a plurality of ventilation openings opening to the outside of an air conditioner outdoor unit, and the condenser (22) is arranged at a position adjacent to the ventilation openings. The fan (24) is used for discharging air in the ventilation chamber (23) to create a negative pressure environment in the ventilation chamber (23).

4. The heat exchange system of the outdoor unit of an air conditioner according to claim 3, wherein On the refrigerant circuit, the refrigerant discharge side of the compressor assembly (21) is connected with the double-pipe heat exchanger (11) and the condenser (22) through a reversing valve respectively. The reversing valve has the following working states: Water cooling state: the reversing valve connects the pipeline between the compressor assembly (21) and the double-pipe heat exchanger (11), and disconnects the pipeline between the compressor assembly (21) and the condenser (22); Air cooling state: the reversing valve disconnects the pipeline between the compressor assembly (21) and the double-pipe heat exchanger (11), and connects the pipeline between the compressor assembly (21) and the condenser (22); Comprehensive heat exchange state: the reversing valve connects the pipeline between the compressor assembly (21) and the double-pipe heat exchanger (11), and connects the pipeline between the compressor assembly (21) and the condenser (22).

5. The heat exchange system of the outdoor unit of an air conditioner according to claim 1, wherein The open circuit is provided with a water storage tank (31) and a second water pump (32). The second water pump (32) is used for pumping water from the water storage tank (31) and injecting the water into the water storage tank (31) after circulating along the open circuit.

6. The heat exchange system of the outdoor unit of an air conditioner according to claim 5, wherein The water storage tank (31) has a water inlet (33) connected to a water pipe and / or a condensate water drainage pipe of an air conditioner and a water outlet (34) connected to a domestic water system.

7. The heat exchange system of the outdoor unit of an air conditioner according to claim 5, wherein Water temperature sensors are arranged on the closed loop and the open loop respectively, and the first water pump (13) and the second water pump (32) are variable frequency pumps, so that the working power of the first water pump (13) and / or the second water pump (32) can be adjusted according to the change of water temperature on the closed loop and the open loop.

8. The heat exchange system of the outdoor unit of an air conditioner according to claim 1, wherein The intermediate container (14) is provided with a sealable water inlet and a water outlet, which are used for injecting distilled water into the closed loop or discharging distilled water in the closed loop.

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