Air conditioning heat exchange system and its control method, storage medium and air conditioner

Abstract

This invention discloses an air conditioning heat exchange system and its control method, storage medium, and air conditioner. The air conditioning heat exchange system includes an outdoor heat exchange unit comprising a first heat exchanger and a second heat exchanger. The first heat exchanger is located upstream of the second heat exchanger in the airflow direction of the outdoor fan. When the air conditioning heat exchange system is in heating mode, the temperature of the first heat exchanger is maintained within a temperature range below the dew point temperature and above the freezing point temperature of the outdoor air, and the temperature of the second heat exchanger is maintained below the freezing point temperature of the outdoor air, thereby reducing the amount of frost buildup in the outdoor heat exchange unit. By setting a first heat exchanger and a second heat exchanger in the outdoor heat exchange unit to ensure the heat exchange effect of the outdoor heat exchange unit, and by having the first heat exchanger located upstream condense water vapor in the outdoor air, the water vapor content of the outdoor air flowing to the second heat exchanger is reduced, thereby significantly reducing the amount of frost buildup at the second heat exchanger and extending the defrosting cycle of the air conditioner.

Description

Technical Field

[0001] This invention relates to the field of air handling equipment technology, and in particular to an air conditioning heat exchange system and its control method, storage medium and air conditioner. Background Technology

[0002] When an air conditioner operates in heating mode under low outdoor air temperatures, frost will form on the surface of the outdoor heat exchange unit. In continuous heating mode, this frost will thicken, narrowing the gaps between the heat exchanger fins. This increases the pressure loss of air passing through the outdoor heat exchange unit, leading to a decrease in the airflow from the outdoor unit's fan and ultimately reducing the outdoor unit's heat exchange performance.

[0003] In related technologies, the heating mode is typically stopped for a certain period of time, allowing the heating and cooling cycles to reverse, and the outdoor heat exchange unit to operate as a condenser for defrosting. However, stopping the heating mode will affect the air conditioner's heating performance and fail to meet the user's needs.

[0004] Currently, absorbents such as zeolite can be used to extend the defrosting interval. However, setting absorbents such as zeolite to adsorb moisture in the air requires heating when releasing moisture, which is a complex process and consumes a lot of energy. Summary of the Invention

[0005] The present invention aims to at least solve one of the technical problems existing in the prior art. Therefore, one object of the present invention is to provide an air heat exchange system that can reduce the amount of frost buildup on the outdoor heat exchange unit in heating mode and extend the defrosting interval of the air conditioner.

[0006] This invention also proposes a control method for an air conditioning heat exchange system.

[0007] The present invention also proposes a storage medium.

[0008] The present invention also proposes an air conditioner.

[0009] An air conditioning heat exchange system according to a first aspect of the present invention includes: a compressor; a four-way valve connected to the compressor; an indoor heat exchanger and an outdoor heat exchange unit, the indoor heat exchanger being connected to the four-way valve; and an outdoor heat exchange unit connected to both the indoor heat exchanger and the four-way valve. The outdoor heat exchange unit includes a first heat exchanger and a second heat exchanger, the first heat exchanger being located upstream of the second heat exchanger in the direction of airflow driven by an outdoor fan. When the air conditioning heat exchange system is in heating mode, the temperature of the first heat exchanger is maintained within a temperature range below the dew point temperature and above the freezing point temperature of the outdoor air, and the temperature of the second heat exchanger is maintained below the freezing point temperature of the outdoor air, thereby reducing the amount of frost on the outdoor heat exchange unit.

[0010] According to an embodiment of the present invention, the air conditioning heat exchange system ensures the heat exchange effect of the outdoor heat exchange unit by setting a first heat exchanger and a second heat exchanger in the outdoor heat exchange unit, and reduces the water vapor content of the outdoor air flowing to the second heat exchanger by condensing water vapor in the outdoor air through the first heat exchanger arranged on the upstream side, thereby significantly reducing the amount of frost at the second heat exchanger and extending the defrosting cycle of the air conditioner.

[0011] According to some embodiments of the present invention, the outdoor heat exchange unit includes: a first refrigerant flow path and a second refrigerant flow path, wherein the first heat exchanger is disposed in the first refrigerant flow path and the second heat exchanger is disposed in the second refrigerant flow path.

[0012] According to some embodiments of the present invention, the first refrigerant flow path and the second refrigerant flow path are arranged in parallel.

[0013] According to some embodiments of the present invention, the first refrigerant flow path and the second refrigerant flow path are connected in series, and the second refrigerant flow path is arranged between the first refrigerant flow path and the four-way valve.

[0014] According to some embodiments of the present invention, the outdoor heat exchange unit further includes: a first expansion member disposed on the first refrigerant flow path and arranged between the first heat exchanger and the indoor heat exchanger; and a second expansion member disposed on the second refrigerant flow path and arranged between the second heat exchanger and the indoor heat exchanger.

[0015] According to some embodiments of the present invention, the second refrigerant flow path further includes a first branch and a second branch, both of which are arranged between the second heat exchanger and the four-way valve.

[0016] According to some embodiments of the present invention, the outdoor heat exchange unit further includes a capillary tube disposed in the second branch.

[0017] According to some embodiments of the present invention, the outdoor heat exchange unit further includes: a first three-way valve, which is connected to a first branch, a second branch and a second heat exchanger respectively, so as to selectively connect the second heat exchanger to the first branch or the second branch.

[0018] According to some embodiments of the present invention, the outdoor heat exchange unit further includes: an injection element, the injection element including a supply port, an intake port and an outlet port, the supply port being connected to the first refrigerant flow path, the intake port being connected to the second pipeline, and the outlet port being connected to the four-way valve.

[0019] According to some embodiments of the present invention, the first refrigerant flow path further includes a third branch and a fourth branch, wherein the third branch is connected to the supply port, and the fourth branch merges with the second branch and is connected to the four-way valve.

[0020] According to some embodiments of the present invention, the outdoor heat exchange unit further includes: a second three-way valve, which is connected to the outlet, the confluence section of the second branch and the fourth branch, and the four-way valve.

[0021] According to some embodiments of the present invention, the outdoor heat exchange unit further includes: a first expansion member disposed in the first refrigerant flow path and arranged between the first heat exchanger and the indoor heat exchanger; a second expansion member disposed in the second refrigerant flow path and arranged between the second heat exchanger and the indoor heat exchanger; the air conditioning heat exchange system further includes: a third three-way valve connected to the first heat exchanger, the second heat exchanger and the second expansion member respectively, the third three-way valve being connected between the first heat exchanger and the second heat exchanger to selectively connect the second expansion member to the second refrigerant flow path.

[0022] According to a control method for an air conditioning heat exchange system of the second embodiment of the present invention, the outdoor unit of the air conditioner includes a first heat exchanger and a second heat exchanger, the first heat exchanger being arranged upstream of the second heat exchanger, the method comprising: maintaining the temperature of the first heat exchanger within a temperature range below the dew point temperature and above the freezing point temperature of the outdoor air during the heating process of the air conditioner; and maintaining the temperature of the second heat exchanger below the freezing point temperature of the outdoor air.

[0023] According to a third aspect of the present invention, a computer-readable storage medium stores a control program for an air conditioning heat exchange system thereon, which, when executed by a processor, implements the above-described control method for the air conditioning heat exchange system.

[0024] An air conditioner according to a fourth aspect of the present invention includes the air conditioning heat exchange system described above, or includes a memory, a processor, and a control program stored in the memory and executable on the processor. When the processor executes the control program, it implements the control method according to the air conditioning heat exchange system described above.

[0025] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0026] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0027] Figure 1 This is a schematic diagram of an outdoor heat exchange unit according to an embodiment of the present invention;

[0028] Figure 2 This is a graph showing the relationship between the first and second heat exchangers and temperature according to an embodiment of the present invention.

[0029] Figure 3 This is an air conditioning heat exchange system according to an embodiment of the present invention;

[0030] Figure 4 This is an air conditioning heat exchange system according to yet another embodiment of the present invention;

[0031] Figure 5 This is an air conditioning heat exchange system according to another embodiment of the present invention;

[0032] Figure 6 This is a cross-sectional view of the jetting component according to an embodiment of the present invention, and a schematic diagram of the internal pressure changes of the jetting component.

[0033] Figure label:

[0034] Air conditioning heat exchange system 100

[0035] Compressor 10, four-way valve 20, indoor heat exchanger 30

[0036] Outdoor heat exchange unit 40, first refrigerant flow path 401, third branch 4011, fourth branch 4012, second refrigerant flow path 402, first branch 4021, second branch 4022, fifth branch 4023, first heat exchanger 41, second heat exchanger 42, first expansion member 43, second expansion member 44, capillary tube 45, injection member 46, supply port 461, suction port 462, discharge port 463, first flow channel 464, second flow channel 465, confluence flow channel 466, diffuser flow channel 467, check valve 47, first three-way valve 51, second three-way valve 52, third three-way valve 53. Detailed Implementation

[0037] Embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and should not be construed as limiting the present invention.

[0038] The following is for reference. Figures 1-6 An air conditioning heat exchange system 100 according to an embodiment of the first aspect of the present invention is described.

[0039] An air conditioning heat exchange system 100 according to an embodiment of the present invention includes: a compressor 10, a four-way valve 20, an indoor heat exchanger 30, and an outdoor heat exchange unit 40.

[0040] like Figure 3 ,like Figure 4 and Figure 5 As shown, the four-way valve 20 is connected to the compressor 10 through a pipeline, and the indoor heat exchanger 30 and the outdoor heat exchange unit 40 are connected in series between the condenser end and the evaporator end of the four-way valve 20.

[0041] Specifically, the outdoor heat exchange unit 40 is located outdoors and is used to evaporate the heat exchange medium (refrigerant) using outdoor air in heating mode and condense the heat exchange medium in cooling mode; the compressor 10 is used to draw in low-pressure gas heat exchange medium and output high-pressure gas heat exchange medium after being compressed by the compressor 10; the four-way valve 20 is used to adjust the flow direction of the heat exchange medium in the air conditioning heat exchange system 100 in heating and cooling modes; the indoor heat exchanger 30 is located indoors and is used to draw in indoor air and cool it to a low temperature in cooling mode and heat it to a high temperature in heating mode.

[0042] The heat exchange medium can be R32 (difluoromethane), but it is not limited to this. The heat exchange medium can also be natural refrigerants such as R290 (propane) and R600a (isobutane), without specific limitations.

[0043] Furthermore, referring to Figure 1 , Figure 1 The arrows in the diagram indicate the airflow direction in the outdoor fan. The outdoor heat exchange unit 40 includes a first heat exchanger 41 and a second heat exchanger 42. The first heat exchanger 41 is located upstream of the second heat exchanger 42 in the airflow direction in the outdoor fan. That is, when the air from the outdoor fan enters the outdoor unit, the outdoor air flows through the first heat exchanger 41 before flowing to the second heat exchanger 42.

[0044] When the air conditioning heat exchange system 100 is in heating mode, the temperature of the first heat exchanger 41 is maintained in the temperature range below the dew point temperature and above the freezing temperature of the outdoor air, and the temperature of the second heat exchanger 42 is maintained below the freezing temperature of the outdoor air, so as to reduce the amount of frost on the outdoor heat exchange unit 40.

[0045] It should be noted that "dew point temperature" refers to the temperature at which water vapor in the air precipitates and turns into water droplets, while "freezing temperature" refers to the temperature at which water vapor in the air condenses and turns into frost.

[0046] Understandably, when outdoor air flows to the first heat exchanger 41, it comes into contact with the first heat exchanger 41 and is cooled by the first heat exchanger 41 to a temperature range below the dew point temperature and above the freezing point temperature. At this time, the water vapor in the outdoor air will liquefy at the first heat exchanger 41. However, since the temperature at the first heat exchanger 41 is above the freezing point, the water vapor will not condense at the first heat exchanger 41, that is, frost will not form at the first heat exchanger 41. The water vapor content in the outdoor air after flowing through the first heat exchanger 41 will decrease, that is, the absolute humidity of the outdoor air at the second heat exchanger 42 is lower than the absolute humidity of the outdoor air at the first heat exchanger 41. When the outdoor air with low water vapor content comes into contact with the second heat exchanger 42, it will be cooled by the second heat exchanger 42 to below the freezing point temperature. At this time, the water vapor in the outdoor air will condense into frost at the second heat exchanger 42. The condensed water vapor will adhere to the surface of the second heat exchanger 42, that is, frost will form on the surface of the second heat exchanger 42.

[0047] Although the surface of the second heat exchanger 42 will still frost over, the absolute humidity of the outdoor air at the second heat exchanger 42 is low (low water vapor content), which will significantly reduce the amount of frost at the second heat exchanger 42, thereby extending the defrosting interval of the air conditioner.

[0048] In related technologies, when the air conditioning heat exchange system 100 is in heating mode, outdoor air condenses into frost at the low-temperature heat exchanger and adheres to the fins. This causes the gaps between the fins to decrease as the frost thickness increases, increasing the resistance of the outdoor airflow path and consequently reducing the airflow of the outdoor fan. Furthermore, as the frost thickness increases, the thermal resistance between the fins and the outdoor air increases, leading to a decrease in the heat exchanger's heat exchange performance and necessitating periodic defrosting. In this application, the amount of frost on the second heat exchanger 42 is reduced, meaning that the period requiring defrosting on the second heat exchanger 42 is longer, thus extending the defrosting interval of the air conditioner.

[0049] In the embodiments of this application, a first heat exchanger 41 and a second heat exchanger 42 are provided at the outdoor heat exchange unit 40. In heating mode, the first heat exchanger 41 and the second heat exchanger 42 operate at different temperatures. By maintaining the temperature of the first heat exchanger 41 within a temperature range below the dew point temperature and above the freezing point of the outdoor air, water vapor in the outdoor air at the first heat exchanger 41 will condense at the first heat exchanger 41. The liquefied water vapor can adhere to the first heat exchanger 41 and flow down from the first heat exchanger 41 when it accumulates to a certain extent, without affecting the heat exchange performance of the first heat exchanger 41.

[0050] Furthermore, the outdoor air flowing through the first heat exchanger 41 can flow to the second heat exchanger 42. The temperature of the second heat exchanger 42 is maintained below the freezing point of the outdoor air, which can better ensure the overall heat exchange performance of the outdoor heat exchange unit 40. Since the outdoor air condenses at the first heat exchanger 41, the water vapor content in the outdoor air can be reduced. When the outdoor air flows to the second heat exchanger 42, since the temperature of the second heat exchanger 42 is below the freezing point, the water vapor in the outdoor air will condense into frost at the second heat exchanger 42 and adhere to the second heat exchanger 42. And because the water vapor content in the outdoor air is low, the amount of frost on the second heat exchanger 42 will be significantly reduced.

[0051] It is further understood that when the frost on the fins of the heat exchanger reaches a certain thickness, defrosting is required. Since the first heat exchanger 41 located upstream of the outdoor air flow direction in this application can consume a large amount of water vapor in advance, reducing the water vapor content of the outdoor air flowing to the second heat exchanger 42, it can slow down the frosting speed at the second heat exchanger 42 and extend the defrosting cycle of the air conditioner.

[0052] According to the embodiment of the present invention, the air conditioning heat exchange system 100 ensures the heat exchange effect of the outdoor heat exchange unit 40 by providing a first heat exchanger 41 and a second heat exchanger 42 in the outdoor heat exchange unit 40, and reduces the water vapor content of the outdoor air flowing to the second heat exchanger 42 by condensing water vapor in the outdoor air through the first heat exchanger 41 arranged on the upstream side, thereby significantly reducing the amount of frost at the second heat exchanger 42 and extending the defrosting cycle of the air conditioner.

[0053] like Figure 3 , Figure 4 and Figure 5 As shown, in some embodiments of the present invention, the outdoor heat exchange unit 40 includes: a first refrigerant flow path 401 and a second refrigerant flow path 402, a first heat exchanger 41 is disposed in the first refrigerant flow path 401, and a second heat exchanger 42 is disposed in the second refrigerant flow path 402.

[0054] in, Figure 3 , Figure 4 and Figure 5 The arrows indicate the flow direction of the heat exchange medium in the air conditioning heat exchange system 100 when it is in heating mode. The first refrigerant flow path 401 and the second refrigerant flow path 402 are connected between the four-way valve 20 and the indoor heat exchanger 30. In heating mode, the heat exchange medium flows from the indoor heat exchanger 30 to the first refrigerant flow path 401 and the second refrigerant flow path 402, and then enters the first heat exchanger 41 and the second heat exchanger 42 respectively. After flowing through the first refrigerant flow path 401 and the second refrigerant flow path 402, the heat exchange medium can flow to the compressor 10 through the four-way valve 20.

[0055] like Figure 3 and Figure 5 As shown, the first refrigerant flow path 401 and the second refrigerant flow path 402 are arranged in parallel. The heat exchange medium can enter the first refrigerant flow path 401 and the second refrigerant flow path 402 respectively. The expansion process of the heat exchange medium in the first refrigerant flow path 401 or the second refrigerant flow path 402 is relatively independent and will not cause interference, which can improve the working reliability of the outdoor heat exchange unit 40.

[0056] like Figure 4 As shown, the first refrigerant flow path 401 and the second refrigerant flow path 402 are connected in series, and the second refrigerant flow path 402 is arranged between the first refrigerant flow path 401 and the four-way valve 20. When the air conditioning heat exchange system 100 is in heating mode, the heat exchange medium flows from the indoor heat exchanger 30 to the first refrigerant flow path 401, and after flowing through the first refrigerant flow path 401, it enters the second refrigerant flow path 402, and then flows to the four-way valve 20 and the compressor 10 via the second refrigerant flow path 402. In the above process, the heat exchange medium is first expanded to a low pressure and a gas-liquid two-phase state through the first refrigerant flow path 401, and after evaporation at the first heat exchanger 41, it enters the second refrigerant flow path 402. The second refrigerant flow path 402 can further expand the heat exchange medium to a low pressure to reduce the evaporation temperature of the second heat exchanger 42.

[0057] like Figure 3 and Figure 5 As shown, in some embodiments of the present invention, the outdoor heat exchange unit 40 further includes: a first expansion member 43 and a second expansion member 44. The first expansion member 43 is disposed on the first refrigerant flow path 401 and arranged between the first heat exchanger 41 and the indoor heat exchanger 30; the second expansion member 44 is disposed on the second refrigerant flow path 402 and arranged between the second heat exchanger 42 and the indoor heat exchanger 30.

[0058] Reference Figure 3In a specific embodiment of the present invention, a first expansion member 43 is disposed on a first refrigerant flow path 401, and a second expansion member 44 is disposed on a second refrigerant flow path 402, with the first expansion member 43 and the second expansion member 44 connected in parallel. The first expansion member 43 is used to expand the heat exchange medium flowing into the first refrigerant flow path 401 to a low pressure, and the second expansion member 44 is used to expand the heat exchange medium flowing into the second refrigerant flow path 402 to a low pressure. The expansion processes of the heat exchange medium by the first expansion member 43 and the second expansion member 44 are relatively independent, and there is no interference between them, which can improve the operational reliability of the outdoor heat exchange unit 40.

[0059] Reference Figure 5 In another specific embodiment of the present invention, the first expansion member 43 is disposed on the first refrigerant flow path 401, and the second expansion member 44 is disposed on the second refrigerant flow path 402. The starting end of the second refrigerant flow path 402 is located between the first expansion member 43 and the first heat exchanger 41 of the first refrigerant flow path 401. That is, the second refrigerant flow path 402 is connected in series with the first expansion member 43 and in parallel with the first heat exchanger 41. When the air conditioning heat exchange system 100 is in heating mode, the heat exchange medium (gas) pressurized by the compressor 10 passes through the four-way valve 20 and is transported to the indoor heat exchanger 30. After exchanging heat with the indoor air, it condenses and the liquefied heat exchange medium is transported to the outdoor heat exchange unit 40 through the connecting pipeline. At the outdoor heat exchange unit 40, after the heat exchange medium enters the first refrigerant flow path 401, it is depressurized by the first expansion member 43 and then flows to the first heat exchanger 41 and the second refrigerant flow path 402 respectively. After the heat exchange medium enters the second refrigerant flow path 402, it is depressurized by the second expansion member 44 and then flows to the second heat exchanger 42.

[0060] like Figure 5 As shown, in a further embodiment of the present invention, the outdoor heat exchange unit 40 further includes a check valve 47. The check valve 47 is disposed on the connecting pipe between the first expansion member 43 and the first heat exchanger 41, the second expansion member 44 and the second heat exchanger 42. The check valve 47 can effectively prevent backflow of the heat exchange medium. When the starting end of the second refrigerant flow path 402 is arranged between the first expansion member 43 and the first heat exchanger 41, the aforementioned check valve 47 can effectively guide the heat exchange medium in the first refrigerant flow path 401 and the second refrigerant flow path 402, thereby improving the operational reliability and stability of the outdoor heat exchange unit 40.

[0061] like Figure 3As shown, in some embodiments of the present invention, the second refrigerant flow path 402 further includes a first branch 4021 and a second branch 4022, both of which are arranged between the second heat exchanger 42 and the four-way valve 20. After the heat exchange medium flows through the second heat exchanger 42, it can flow to the four-way valve 20 through one of the first branch 4021 and the second branch 4022, i.e., one branch of the first branch 4021 and the second branch 4022 is closed, and the heat exchange medium flows to the four-way valve 20 through the other branch; alternatively, it can flow to the four-way valve 20 simultaneously through the first branch 4021 and the second branch 4022, i.e., both the first branch 4021 and the second branch 4022 are kept in communication with the second heat exchanger 42, and the heat exchange medium flowing out of the second heat exchanger 42 can flow to the four-way valve 20 through the first branch 4021 and the second branch 4022 respectively.

[0062] In a further embodiment of the present invention, the outdoor heat exchange unit 40 further includes a capillary tube 45, which is disposed on the second branch 4022. When the heat exchange medium flows into the second branch 4022 through the second heat exchanger 42, it needs to pass through the capillary tube 45 before flowing to the four-way valve 20. When the heat exchange medium passes through the capillary tube 45, resistance will be generated at the capillary tube 45, thereby reducing the internal pressure of the second heat exchanger 42, and thus enabling the second heat exchanger 42 to maintain a lower temperature than the first heat exchanger 41.

[0063] like Figure 3 As shown, in a further embodiment of the present invention, the outdoor heat exchange unit 40 further includes: a first three-way valve 51, which is connected to the first branch 4021, the second branch 4022 and the second heat exchanger 42 respectively, so as to selectively connect the second heat exchanger 42 to the first branch 4021 or the second branch 4022, thereby adjusting the flow path of the heat exchange medium.

[0064] Reference Figure 3 A first three-way valve 51 is arranged between the first branch 4021, the second branch 4022, and the second heat exchanger 42. When the first three-way valve 51 connects the second heat exchanger 42 to the first branch 4021 but not to the second branch 4022, the heat exchange medium flows through the second heat exchanger 42 to the first branch 4021, and then flows to the four-way valve 20 after passing through the first branch 4021. When the first three-way valve 51 connects the second heat exchanger 42 to the second branch 4022 and... When not connected to the first branch 4021, the heat exchange medium flows through the second heat exchanger 42 to the second branch 4022, and then flows to the four-way valve 20. The second branch 4022 is equipped with a capillary tube 45. Due to the resistance generated at the capillary tube 45, the internal pressure of the second heat exchanger 42 will decrease accordingly. Thus, the second heat exchanger 42 can maintain a lower temperature than the first heat exchanger 41, thereby ensuring the overall heat exchange effect of the outdoor heat exchange unit 40.

[0065] It is understandable that a first three-way valve 51 is installed between the second heat exchanger 42 and the first branch 4021 and the second branch 4022. By adjusting the first three-way valve 51, the flow path of the heat exchange medium flowing out of the second heat exchanger 42 can be switched. When the second heat exchanger 42 is connected to the first branch 4021 but not to the second branch 4022, the heat exchange medium does not need to pass through the capillary tube 45. At this time, the first heat exchanger 41 and the second heat exchanger 42 can operate in heating mode at the same temperature. Furthermore, by controlling the first heat exchanger 41 and the second heat exchanger 42 to operate at the same temperature in areas unaffected by frost, the decrease in evaporation temperature leading to a decrease in heating efficiency ratio is avoided.

[0066] like Figure 5 As shown, in some embodiments of the present invention, the outdoor heat exchange unit 40 further includes an injection element 46, which includes a supply port 461, an intake port 462 and an outlet port 463. The supply port 461 is connected to the first refrigerant flow path 401, the intake port 462 is connected to the second pipeline, and the outlet port 463 is connected to the four-way valve 20.

[0067] Combination Figure 5 and Figure 6 After flowing through the first refrigerant flow path 401, the heat exchange medium can enter the injector 46 through the supply port 461. After flowing through the second pipeline, the heat exchange medium can enter the injector 46 through the suction port 462. Inside the injector 46, the heat exchange medium enters through the supply port 461 and the suction port 462 respectively, and after merging, it is discharged from the outlet 463. That is, the heat exchange medium in the first refrigerant flow path 401 and the second refrigerant flow path 402 first enters into two independent flow channels in the injector 46 through the supply port 461 and the suction port 462 respectively, and then merges at the downstream end of the two flow channels (the end near the outlet 463) and is discharged from the outlet 463.

[0068] like Figure 6 As shown, in a specific embodiment of the present invention, the injection element 46 includes: a first flow channel 464, a second flow channel 465, a confluence flow channel 466, and a diffusion flow channel 467. The first flow channel 464 is connected to the supply port 461, and the second flow channel 465 is connected to the suction port 462. The heat exchange medium in the first flow channel 464 and the second flow channel 465 can converge and mix at the confluence flow channel 466. The mixed heat exchange medium flows to the diffusion flow channel 467 and is discharged from the discharge port 463.

[0069] In a further embodiment of the invention, a tapering section is formed at the end of the first flow channel 464 away from the supply port 461. The cross-sectional area of ​​the first flow channel 464 gradually decreases in the tapering section. The heat exchange medium (gas) expands to a low pressure when passing through the tapering section, and the pressure of the heat exchange medium gas is converted into the velocity of the fluid, accelerating its discharge from the outlet of the tapering section. Because the flow velocity of the heat exchange medium gas discharged from the first flow channel 464 to the confluence flow channel 466 is fast, the pressure around the tapering section will decrease. The heat exchange medium gas in the second heat exchange channel can be drawn into the second flow channel 465 through the suction port 462 and merge with the heat exchange medium gas in the first flow channel 464 at the confluence flow channel 466.

[0070] When the heat exchange media in the first flow channel 464 and the second flow channel 465 converge in the manifold 466, their kinetic energy is averaged at the manifold 466 and flows towards the diffuser 467. The diffuser 467 gradually widens towards the outlet 463. The flow velocity of the heat exchange media decreases in the diffuser 467, converting kinetic energy into pressure, becoming an intermediate pressure between the pressure at the supply port 461 and the pressure at the suction port 462, and is discharged from the outlet 463. After the heat exchange media in the first refrigerant flow path 401 and the second refrigerant flow path 402 converge at the ejector, they flow towards the four-way valve 20 with increased pressure and return to the compressor 10.

[0071] like Figure 5 As shown, in some embodiments of the present invention, the first refrigerant flow path 401 further includes a third branch 4011 and a fourth branch 4012. The third branch 4011 is connected to the supply port 461, and the fourth branch 4012 merges with the second branch 4022 and is connected to the four-way valve 20. The third branch 4011 and the fourth branch 4012 are arranged between the first heat exchanger 41 and the four-way valve 20. The third branch 4011 is used to connect the first heat exchanger 41 to the injection element 46. The heat exchange medium in the first heat exchanger 41 can enter the supply port 461 through the third branch 4011, and the heat exchange medium in the first heat exchanger 41 can also flow directly to the four-way valve 20 and return to the compressor 10 through the fourth branch 4012.

[0072] Reference Figure 5The first branch 4021 of the second refrigerant flow path 402 is connected to the suction port 462 of the injection component 46, and the second branch 4022 is connected to the four-way valve 20 after merging with the fourth branch 4012. When it is necessary to combine the evaporated heat exchange medium gas through the injector 46 and deliver it to the four-way valve 20 under pressure, the second branch 4022 and the fourth branch 4012 are closed, and the first branch 4021 and the third branch 4011 are connected to the injector 46. The heat exchange medium can then be delivered to the four-way valve 20 after flowing through the injector 46. When the above actions are not required, the connection between the injector 46 and the four-way valve 20 can be disconnected, and the second branch 4022 and the fourth branch 4012 can be connected to the four-way valve 20. The heat exchange medium discharged through the first heat exchanger 41 and the second heat exchanger 42 can flow to the second branch 4022 and the fourth branch 4012 respectively, and after merging, flow to the four-way valve 20 and return to the compressor 10.

[0073] like Figure 5 As shown, in a further embodiment of the present invention, the outdoor heat exchange unit 40 further includes: a second three-way valve 52, which is connected to the outlet 463, the confluence section of the second branch 4022 and the fourth branch 4012, and the four-way valve 20.

[0074] Reference Figure 5 Specifically, the second three-way valve 52 has three ports, which are respectively connected to the outlet 463 of the injection element 46, the confluence section of the second branch 4022 and the fourth branch 4012, and the four-way valve 20. The second three-way valve 52 and the four-way valve 20 are normally connected. The second three-way valve 52 can be selectively connected to one of the outlet 463 and the aforementioned confluence section. By adjusting the second three-way valve 52, the on / off state of the first branch 4021, the second branch 4022, the third branch 4011, and the fourth branch 4012 and the four-way valve 20 can be adjusted, thereby regulating the working connection mode of the outdoor heat exchange unit 40 to meet different working requirements of the outdoor heat exchange unit 40.

[0075] Specifically, when the second three-way valve 52 is not connected to the injection element 46, the heat exchange medium in the first branch 4021 and the third branch 4011 cannot enter the injection element 46. At this time, the heat exchange medium in the first refrigerant flow path 401 and the second refrigerant flow path 402 will flow to the four-way valve 20 and return to the compressor 10 through the second branch 4022 and the fourth branch 4012, respectively. When the second three-way valve 52 is connected to the injection element 46, in order to ensure the effect of increasing the pressure of the heat exchange medium, the second three-way valve 52 is not connected to the second branch 4022 and the fourth branch 4012. At this time, the heat exchange medium in the first refrigerant flow path 401 and the second refrigerant flow path 402 will flow to the injection element 46 through the first branch 4021 and the third branch 4011, respectively, and after merging at the injection element 46, it will flow to the four-way valve 20 through the second three-way valve 52 in a state of pressure increase and return to the compressor 10.

[0076] like Figure 4 As shown, in some embodiments of the present invention, the outdoor heat exchange unit 40 further includes a first expansion member 43 and a second expansion member 44. The first expansion member 43 is disposed on the first refrigerant flow path 401 and is arranged between the first heat exchanger 41 and the indoor heat exchanger 30. The second expansion member 44 is disposed on the second refrigerant flow path 402 and is arranged between the second heat exchanger 42 and the indoor heat exchanger 30. The air conditioning heat exchange system 100 further includes a third three-way valve 53. When the first refrigerant flow path 401 and the second refrigerant flow path 402 are connected in series, the third three-way valve 53 is connected between the first heat exchanger 41 and the second heat exchanger 42 to selectively connect the second expansion member 44 to the second refrigerant flow path 402. It is understandable that by setting the third three-way valve 53, the second expansion member 44 can be selectively connected to the second refrigerant flow path 402, thereby establishing a flow path for the heat exchange medium that does not pass through the expansion mechanism, so that the first heat exchanger 41 and the second heat exchanger 42 can operate at the same temperature, avoiding a decrease in heating efficiency caused by a drop in evaporation temperature.

[0077] Specifically, refer to Figure 4The second refrigerant flow path 402 also includes a fifth branch 4023, which is connected in parallel with the pipeline section where the second expansion member 44 is located. The three ports of the third three-way valve 53 are respectively connected to the first refrigerant flow path 401, the fifth branch 4023, and the second expansion member 44. When the air conditioning heat exchange system 100 is in heating mode, the third three-way valve 53 is located downstream of the first refrigerant flow path 401. The heat exchange medium flows to the third three-way valve 53 after flowing through the first refrigerant flow path 401. The third three-way valve 53 can selectively connect the second expansion member 44. When the third three-way valve 53 is connected to the pipeline section containing the second expansion member 44 and disconnected from the fifth branch 4023, the heat exchange medium flowing out of the first refrigerant flow path 401 expands to a low pressure at the second expansion member 44, further reducing the pressure of the heat exchange medium and thus lowering the evaporation temperature of the second heat exchanger 42. When the third three-way valve 53 is connected to the fifth branch 4023 and disconnected from the pipeline containing the second expansion member 44, the heat exchange medium flowing out of the first refrigerant flow path 401 directly enters the second heat exchanger 42 via the fifth branch 4023. At this time, the first heat exchanger 41 and the second heat exchanger 42 operate at the same temperature, avoiding a drop in evaporation temperature that would affect the heating efficiency ratio. It should be noted that the "upstream" and "downstream" mentioned above refer to the upstream and downstream flow directions of the heat exchange medium in the air conditioning heat exchange system 100 when it is in heating mode.

[0078] In some embodiments of the present invention, the first expansion member 43 and the second expansion member 44 are configured as expansion valves, thereby enabling them to effectively expand and reduce the pressure of the heat exchanger medium. It should be noted that the first expansion member 43 and the second expansion member 44 are not limited to this configuration. The first expansion member 43 and the second expansion member 44 are components that reduce the pressure of the high-pressure side heat exchange medium to a low pressure. They can be resistance bodies such as expansion valves or capillary tubes 45, and their expansion function can be achieved by adjusting their inner diameter and length.

[0079] The following is in conjunction with the instruction manual. Figure 3 , Figure 4 and Figure 5 Heating modes of the air conditioning heat exchange system 100 according to various embodiments of the present invention are described below:

[0080] (1)Reference Figure 3 The pressurized heat exchange medium (gas) in the compressor 10 flows to the indoor heat exchanger 30 through the four-way valve 20. The heat exchange medium is condensed at the indoor heat exchanger 30. The liquefied heat exchange medium is transported to the indoor heat exchanger 30 and then to the first refrigerant flow path 401 and the second refrigerant flow path 402 respectively.

[0081] In the first refrigerant flow path 401, the heat exchange medium expands to a low pressure via the first expansion member 43, becomes a gas-liquid two-phase state, and is transported to the first heat exchanger 41. After evaporating inside the first heat exchanger 41, the heat exchange medium returns to the compressor 10 through the four-way valve 20. In the second refrigerant flow path 402, the heat exchange medium expands to a low pressure via the second expansion member 44, becomes a gas-liquid two-phase state, and is transported to the second heat exchanger 42. After evaporating inside the second heat exchanger 42, the heat exchange medium passes through the capillary tube 45 and flows to the four-way valve 20 to return to the compressor 10. According to the resistance generated by the capillary tube 45, the internal pressure of the second heat exchanger 42 will decrease accordingly, thereby allowing the second heat exchanger 42 to maintain a lower temperature than the first heat exchanger 41.

[0082] The connection between the second heat exchanger 42 and the capillary tube 45 can be switched by the first three-way valve 51. When the first three-way valve 51 disconnects the second heat exchanger 42 from the capillary tube 45, the first heat exchanger 41 and the second heat exchanger 42 can heat at the same temperature. The first heat exchanger 41 and the second heat exchanger 42 can be operated in areas unaffected by frost, avoiding the deterioration of the heating efficiency ratio due to temperature drop.

[0083] Understandably, by switching the four-way valve 20, the air conditioning heat exchange system 100 can be switched to the tooling state corresponding to the cooling mode.

[0084] (2)Reference Figure 4 The pressurized heat exchange medium (gas) in the compressor 10 flows to the indoor heat exchanger 30 through the four-way valve 20. The heat exchange medium is condensed at the indoor heat exchanger 30. The liquefied heat exchange medium is transported to the indoor heat exchanger 30 and then sequentially to the first refrigerant flow path 401 and the second refrigerant flow path 402.

[0085] In the first refrigerant flow path 401, the heat exchange medium expands to a low pressure through the first expansion member 43, becomes a gas-liquid two-phase state, and is transported to the first heat exchanger 41. In the first heat exchanger 41, part of the heat exchange medium will evaporate. After evaporation inside the first heat exchanger 41, the heat exchange medium is transported to the third three-way valve 53. When the third three-way valve 53 is connected to the second expansion member 44, the evaporation pressure of the first heat exchanger 41 will further reduce the pressure of the heat exchange medium, thereby reducing the evaporation temperature of the second heat exchanger 42. When the third three-way valve 53 is connected to the fifth branch 4023, the heat exchange medium enters the second heat exchanger 42 directly without going through the expansion mechanism. The first heat exchanger 41 and the second heat exchanger 42 can operate at the same temperature, avoiding the deterioration of the heating efficiency ratio due to the decrease in evaporation temperature.

[0086] By switching the four-way valve 20, the air conditioning heat exchange system 100 can be switched to the tooling state corresponding to the cooling mode.

[0087] (3)Reference Figure 5 The pressurized heat exchange medium (gas) in the compressor 10 flows to the indoor heat exchanger 30 through the four-way valve 20. The heat exchange medium is condensed at the indoor heat exchanger 30. The liquefied heat exchange medium is transported to the indoor heat exchanger 30 and then to the first refrigerant flow path 401 and the second refrigerant flow path 402 respectively.

[0088] In the first refrigerant flow path 401, the heat exchange medium expands to a low pressure via the first expansion member 43 and is transported to the first heat exchanger 41. In the second refrigerant flow path 402, the heat exchange medium expands to a low pressure via the second expansion member 44, becoming a gas-liquid two-phase state and being transported to the second heat exchanger 42. After passing through the first heat exchanger 41 and the second heat exchanger 42, the heat exchange medium merges at the ejector and returns to the compressor 10 in a state of increased pressure after passing through the second three-way valve 52 and the four-way valve 20. At this time, the outdoor heat exchange unit 40 operates at dual temperatures (the first heat exchanger 41 and the second heat exchanger 42 operate at different temperatures), which can also suppress the deterioration of the heating efficiency ratio.

[0089] The operation mode as shown in Example (1) can be achieved by switching the second three-way valve 52.

[0090] By switching the four-way valve 20, the air conditioning heat exchange system 100 can be switched to the tooling state corresponding to the cooling mode.

[0091] It should be noted that in embodiments (1) and (2), the outdoor heat exchange unit 40 can operate at dual temperatures. However, the evaporation temperature of the second heat exchanger 42 decreases, resulting in a decrease in the density of the heat exchange medium drawn into the compressor 10, which in turn reduces the circulation volume of the heat exchange medium. Therefore, in order to meet the heat exchange (heating) requirements of the indoor heat exchanger 30, it is necessary to increase the speed of the compressor 10. In embodiment (3), by setting the injection element 46, the pressure state of the heat exchange medium entering the compressor 10 can be increased, ensuring the circulation volume of the heat exchange medium.

[0092] According to a control method for an air conditioning heat exchange system 100 of a second aspect embodiment of the present invention, the outdoor unit of the air conditioner includes a first heat exchanger 41 and a second heat exchanger 42, wherein the first heat exchanger 41 is arranged upstream of the second heat exchanger 42. The method includes: during the heating process of the air conditioner, maintaining the temperature of the first heat exchanger 41 within a temperature range below the dew point temperature and above the freezing point temperature of the outdoor air; and maintaining the temperature of the second heat exchanger 42 below the freezing point temperature of the outdoor air. "Upstream" refers to the upstream side of the flow path of the outdoor air through the first heat exchanger 41 and the second heat exchanger 42, i.e., the outdoor air first contacts the first heat exchanger 41.

[0093] When outdoor air flows to the first heat exchanger 41, the outdoor air comes into contact with the first heat exchanger 41 and is cooled to a temperature range below the dew point temperature and above the freezing temperature at the first heat exchanger 41. Water vapor in the outdoor air will liquefy at the first heat exchanger 41, but since the temperature at the first heat exchanger 41 is above the freezing temperature, the water vapor will not condense at the first heat exchanger 41, that is, frost will not form at the first heat exchanger 41.

[0094] Furthermore, the water vapor content in the outdoor air flowing through the first heat exchanger 41 will decrease, meaning that the absolute humidity of the outdoor air at the second heat exchanger 42 is lower than that at the first heat exchanger 41. When the outdoor air with low water vapor content comes into contact with the second heat exchanger 42, the outdoor air will be cooled to below the freezing temperature by the second heat exchanger 42. At this time, the water vapor in the outdoor air will condense into frost at the second heat exchanger 42, and the condensed water vapor will adhere to the surface of the second heat exchanger 42, that is, the surface of the second heat exchanger 42 will be frosted.

[0095] Therefore, although the surface of the second heat exchanger 42 will still frost, the absolute humidity of the outdoor air at the second heat exchanger 42 is low (low water vapor content), and the amount of frost at the second heat exchanger 42 will be significantly reduced, thereby extending the defrosting interval of the air conditioner.

[0096] To implement the above embodiments, the present invention provides a computer-readable storage medium storing a control program for an air conditioning heat exchange system 100. When the control program for the air conditioning heat exchange system 100 is executed by a processor, the control method for the air conditioning heat exchange system 100 of the above embodiments can be implemented.

[0097] The computer-readable storage medium of this invention can enable dual-temperature operation of the two heat exchangers in the outdoor heat exchange unit 40. When the stored air conditioning control program is executed by the processor, it can reduce the amount of frost in the outdoor heat exchange unit 40 and extend the defrosting cycle of the air conditioner.

[0098] According to an embodiment of the present invention, the air conditioner executes a control program for the heat exchange system stored in the memory via a processor to adjust the operating state of the air conditioning heat exchange system 100, thereby extending the defrosting cycle of the air conditioner. The air conditioner of this embodiment may further include the aforementioned air conditioning heat exchange system 100. By condensing water vapor in the outdoor air at the first heat exchanger 41 in the outdoor heat exchange unit 40, the water vapor content of the outdoor air flowing to the second heat exchanger 42 is reduced, thereby reducing the amount of frost at the second heat exchanger 42 and extending the defrosting cycle of the air conditioner.

[0099] The memory can be, but is not limited to, Random Access Memory (RAM), Read Only Memory (ROM), Programmable Read-Only Memory (PROM), Erasable Programmable Read-Only Memory (EPROM), Electrically Erasable Programmable Read-Only Memory (EEPROM), etc. The memory stores the program, and after receiving the execution instruction, the processor executes the program to implement the steps of the air conditioning control method described in the above embodiments.

[0100] The processor may be an integrated circuit chip with signal processing capabilities. The aforementioned processor can be a general-purpose processor, including a Central Processing Unit (CPU), a Network Processor (NP), etc.; it can also be a Digital Signal Processor (DSP), an Application-Specific Integrated Circuit (ASIC), a Field-Programmable Gate Array (FPGA), or other programmable logic devices, discrete gate or transistor logic devices, or discrete hardware components. It can implement or execute the methods, steps, and logic block diagrams disclosed in the embodiments of this invention. The general-purpose processor can be a microprocessor or any conventional processor.

[0101] It should be noted that the logic and / or steps represented in the flowchart or otherwise described herein, for example, can be considered as a sequenced list of executable instructions for implementing logical functions, and can be embodied in any computer-readable medium for use by, or in conjunction with, an instruction execution system, apparatus, or device (such as a computer-based system, a processor-included system, or other system that can fetch and execute instructions from, an instruction execution system, apparatus, or device). For the purposes of this specification, "computer-readable medium" can be any means that can contain, store, communicate, propagate, or transmit programs for use by, or in conjunction with, an instruction execution system, apparatus, or device. More specific examples (a non-exhaustive list) of computer-readable media include: an electrical connection having one or more wires (electronic device), a portable computer disk drive (magnetic device), random access memory (RAM), read-only memory (ROM), erasable and editable read-only memory (EPROM or flash memory), fiber optic devices, and portable optical disc read-only memory (CDROM). Alternatively, the computer-readable medium may be paper or other suitable media on which the program can be printed, since the program can be obtained electronically, for example, by optically scanning the paper or other medium, followed by editing, interpreting, or otherwise processing as necessary, and then stored in a computer memory.

[0102] It should be understood that various parts of the present invention can be implemented in hardware, software, firmware, or a combination thereof. In the above embodiments, multiple steps or methods can be implemented in software or firmware stored in memory and executed by a suitable instruction execution system. For example, if implemented in hardware, as in another embodiment, it can be implemented using any one or a combination of the following techniques known in the art: discrete logic circuits having logic gates for implementing logical functions on data signals, application-specific integrated circuits (ASICs) having suitable combinational logic gates, programmable gate arrays (PGAs), field-programmable gate arrays (FPGAs), etc.

[0103] In the description of this specification, the references to terms such as "one embodiment," "some embodiments," "illustrative embodiment," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0104] Although embodiments of the invention have been shown and described, those skilled in the art will understand that various changes, modifications, substitutions and alterations can be made to these embodiments without departing from the principles and spirit of the invention, the scope of which is defined by the claims and their equivalents.

Claims

1. An air conditioning heat exchange system, characterized in that, include: compressor; A four-way valve, which is connected to the compressor; An indoor heat exchanger, which is connected to the four-way valve; An outdoor heat exchange unit, which is connected to the indoor heat exchanger and the four-way valve respectively; The outdoor heat exchange unit includes a first heat exchanger and a second heat exchanger, wherein the first heat exchanger is located upstream of the second heat exchanger in the direction of air flow driven by the outdoor fan. When the air conditioning heat exchange system is in heating mode, the temperature of the first heat exchanger is maintained within the temperature range below the dew point temperature and above the freezing point temperature of the outdoor air, and the temperature of the second heat exchanger is maintained below the freezing point temperature of the outdoor air. The outdoor heat exchange unit includes: a first refrigerant flow path and a second refrigerant flow path, wherein the first heat exchanger is disposed in the first refrigerant flow path and the second heat exchanger is disposed in the second refrigerant flow path; The first refrigerant flow path and the second refrigerant flow path are connected in parallel. The second refrigerant flow path further includes a first branch and a second branch, both of which are arranged between the second heat exchanger and the four-way valve.

2. The air conditioning heat exchange system according to claim 1, characterized in that, The first refrigerant flow path and the second refrigerant flow path are connected in series, and the second refrigerant flow path is arranged between the first refrigerant flow path and the four-way valve.

3. The air conditioning heat exchange system according to claim 1 or 2, characterized in that, The outdoor heat exchange unit also includes: The first expansion member is disposed in the first refrigerant flow path and is arranged between the first heat exchanger and the indoor heat exchanger; The second expansion member is disposed in the second refrigerant flow path and is arranged between the second heat exchanger and the indoor heat exchanger.

4. The air conditioning heat exchange system according to claim 1, characterized in that, It also includes a capillary tube disposed in the second branch.

5. The air conditioning heat exchange system according to claim 1, characterized in that, Also includes: A first three-way valve is connected to a first branch, a second branch, and a second heat exchanger, respectively, to selectively connect the second heat exchanger to either the first branch or the second branch.

6. The air conditioning heat exchange system according to claim 1, characterized in that, Also includes: The injection component includes a supply port, an intake port, and an outlet port. The supply port is connected to the first refrigerant flow path, the intake port is connected to the second refrigerant flow path, and the outlet port is connected to the four-way valve.

7. The air conditioning heat exchange system according to claim 6, characterized in that, The injection component also includes: A first flow channel, which is connected to the supply port; A second flow channel, which is connected to the suction port; A confluence channel is provided downstream of the first channel and the second channel and is connected to the first channel and the second channel.

8. The air conditioning heat exchange system according to claim 7, characterized in that, The injection component further includes a diffusion channel, which is disposed downstream of the confluence channel and communicates with the confluence channel.

9. The air conditioning heat exchange system according to claim 6, characterized in that, The first refrigerant flow path further includes a third branch and a fourth branch. The third branch is connected to the supply port, and the fourth branch merges with the second branch and is connected to the four-way valve.

10. The air conditioning heat exchange system according to claim 9, characterized in that, Also includes: The second three-way valve is connected to the outlet, the confluence section of the second branch and the fourth branch, and the four-way valve.

11. The air conditioning heat exchange system according to claim 2, characterized in that, The outdoor heat exchange unit also includes: The first expansion member is disposed in the first refrigerant flow path and is arranged between the first heat exchanger and the indoor heat exchanger; The second expansion member is disposed in the second refrigerant flow path and is arranged between the second heat exchanger and the indoor heat exchanger. The air conditioning heat exchange system further includes a third three-way valve, which is connected to the first heat exchanger, the second heat exchanger and the second expansion member respectively. The third three-way valve is connected between the first heat exchanger and the second heat exchanger to selectively connect the second expansion member to the second refrigerant flow path.

12. A control method for an air conditioning heat exchange system, applicable to the air conditioning heat exchange system according to any one of claims 1-11, characterized in that, The outdoor heat exchange unit includes a first heat exchanger and a second heat exchanger, wherein the first heat exchanger is arranged upstream of the second heat exchanger, and the method includes: During the heating process of the air conditioner, the temperature of the first heat exchanger is maintained within a temperature range that is below the dew point temperature of the outdoor air and above the freezing temperature. The temperature of the second heat exchanger is maintained below the freezing point of the outdoor air.

13. A computer-readable storage medium, characterized in that, It stores a control program for an air conditioning heat exchange system, which, when executed by a processor, implements the control method for the air conditioning heat exchange system according to claim 12.

14. An air conditioner, characterized in that, The system includes an air conditioning heat exchange system according to any one of claims 1-11, or includes a memory, a processor, and a control program stored in the memory and executable on the processor, wherein when the processor executes the control program, it implements the control method for the air conditioning heat exchange system according to claim 12.

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