Air conditioner outdoor unit, air conditioner system and control method thereof

Abstract

The application relates to an air conditioner outdoor unit, an air conditioner system and a control method thereof, and belongs to the technical field of air conditioners. The application solves the technical problem of high cost of an air conditioner outdoor unit in the prior art due to the need for additionally arranging a supercooler, an enthalpy-increasing pipeline and a heating assembly. The air conditioner outdoor unit comprises a compressor, is provided with an enthalpy-increasing suction port, an outdoor heat exchanger provided with an upper-layer heat exchange row and first and second heat exchange pipes located below the upper-layer heat exchange row, the first heat exchange pipe is connected and arranged between the upper-layer heat exchange row and an air conditioner indoor unit, and the second heat exchange pipe is connected and arranged between the upper-layer heat exchange row and the enthalpy-increasing suction port of the compressor. The air conditioner system comprises the air conditioner outdoor unit. The control method is used for controlling the air conditioner system. Through the structure, the air conditioner outdoor unit and the air conditioner system are lower in cost.

Description

TECHNICAL FIELD

[0001] The present application belongs to the technical field of air conditioners, and particularly relates to an air conditioner outdoor unit, an air conditioner system and a control method thereof. BACKGROUND

[0002] Currently, an overcooler is usually configured in the outdoor unit of an air conditioner system to improve the supercooling degree of the refrigerant flowing into an indoor unit in a refrigeration mode, and an additional enthalpy-increasing pipeline is separately provided for the compressor to increase the enthalpy, and in addition, a heating assembly is separately provided to heat the enthalpy-increasing pipeline in a heating mode to avoid icing of the enthalpy-increasing pipeline. The overcooler, the additional enthalpy-increasing pipeline and the additional heating assembly result in high cost of the air conditioner outdoor unit in the prior art. SUMMARY

[0003] The present application provides an air conditioner outdoor unit, an air conditioner system and a control method thereof, which are used to solve the technical problem of high cost of the air conditioner outdoor unit in the prior art due to the need for additional overcooler, enthalpy-increasing pipeline and heating assembly.

[0004] The present application is implemented by the following technical scheme: an air conditioner outdoor unit, comprising:

[0005] a compressor, provided with an enthalpy-increasing suction port;

[0006] an outdoor heat exchanger, provided with an upper heat exchange row and first and second heat exchange tubes located below the upper heat exchange row;

[0007] the first heat exchange tube is communicatively arranged between the upper heat exchange row and an air conditioner indoor unit;

[0008] the second heat exchange tube is communicatively arranged between the upper heat exchange row and the enthalpy-increasing suction port of the compressor.

[0009] Further, in order to better implement the present application, it further comprises:

[0010] a first throttling valve, arranged on a first pipeline that communicates the second heat exchange tube and the upper heat exchange row.

[0011] Further, in order to better implement the present application, the first throttling valve is an electronic expansion valve.

[0012] Further, in order to better implement the present application, it further comprises:

[0013] a liquid collecting pipe, one end of which is in communication with the compressor and the upper heat exchange row;

[0014] a capillary tube and a liquid distributor, the capillary tube being in communication with the other end of the liquid distributor and the upper heat exchange row;

[0015] The first heat exchange pipe and the second heat exchange pipe are communicated with the distributor.

[0016] The first throttling valve is arranged on a first pipe communicating the second heat exchange pipe and the distributor.

[0017] Further, in order to better realize the present application, fins are arranged on the outer walls of the first heat exchange pipe and the second heat exchange pipe, and the fins on the first heat exchange pipe are attached to the fins on the second heat exchange pipe.

[0018] The first heat exchange pipe and the second heat exchange pipe are respectively located at the leeward side and the windward side in the air conditioner outdoor unit.

[0019] Further, in order to better realize the present application, the first heat exchange pipe and the second heat exchange pipe are both serpentine pipes, and the first heat exchange pipe and the second heat exchange pipe are arranged in staggered manner.

[0020] The present application also provides an air conditioning system, comprising:

[0021] The air conditioner indoor unit and the above-mentioned air conditioner outdoor unit, the air conditioner indoor unit is communicated with the first heat exchange pipe through the second pipe, and the second pipe is provided with a second throttling valve.

[0022] The present application also provides a control method of the above-mentioned air conditioning system, comprising:

[0023] Obtaining the operation mode of the air conditioning system;

[0024] Adjusting the flow direction of refrigerant in the air conditioning system according to the operation mode of the air conditioning system.

[0025] Further, in order to better realize the present application, the operation mode of the air conditioning system is the refrigeration mode, and the method comprises:

[0026] Using the compressor to send the high-temperature and high-pressure refrigerant into the upper heat exchange row for heat exchange to obtain the medium-pressure two-phase state refrigerant;

[0027] Using the upper heat exchange row to send part of the medium-pressure two-phase state refrigerant into the first heat exchange pipe, and using the upper heat exchange row to send another part of the medium-pressure two-phase state refrigerant into the second heat exchange pipe;

[0028] Using the fan in the air conditioner outdoor unit to blow air from the side of the second heat exchange pipe, using the wind force to bring part of the cold energy of the medium-pressure two-phase state refrigerant in the second heat exchange pipe to the first heat exchange pipe to increase the supercooling degree of the refrigerant in the first heat exchange pipe, and the medium-pressure two-phase state refrigerant losing part of the cold energy in the second heat exchange pipe evaporates to form gaseous refrigerant;

[0029] The first heat exchange pipe is used to send the refrigerant with increased supercooling degree into the air conditioner indoor unit to perform refrigeration, and the second heat exchange pipe is used to send the gaseous refrigerant into the enthalpy-increasing suction port of the compressor to perform enthalpy-increasing on the compressor.

[0030] Further, in order to better realize the present application, the operation mode of the air conditioning system is a heating mode, and the method comprises the following steps:

[0031] The compressor is used to send the refrigerant with high temperature and high pressure into the air conditioner indoor unit to perform heating, so as to obtain condensed refrigerant;

[0032] The second pipeline is used to send the condensed refrigerant in the air conditioner indoor unit to the second throttling valve, the second throttling valve is used to throttle and depressurize the condensed refrigerant, so as to obtain refrigerant in a low-pressure two-phase state;

[0033] The second pipeline is used to send the refrigerant in a low-pressure two-phase state into the first heat exchange pipe to heat the first heat exchange pipe and the second heat exchange pipe attached to the first heat exchange pipe;

[0034] The first heat exchange pipe is used to send part of the refrigerant in a low-pressure two-phase state into the upper heat exchange row to perform evaporation, and the first heat exchange pipe is used to send another part of the refrigerant in a low-pressure two-phase state into the second heat exchange pipe;

[0035] The second heat exchange pipe heated by the first heat exchange pipe is used to heat the entering refrigerant in a low-pressure two-phase state, so that the refrigerant in a low-pressure two-phase state in the second heat exchange pipe is evaporated into gaseous refrigerant;

[0036] The upper heat exchange row is used to send the evaporated refrigerant back to the compressor, and the second heat exchange pipe is used to send the gaseous refrigerant into the enthalpy-increasing suction port of the compressor to perform enthalpy-increasing on the compressor.

[0037] Compared with the prior art, the present application has the following beneficial effects:

[0038] (1) The air conditioner outdoor unit provided by the present application comprises a compressor and an outdoor heat exchanger, the compressor is provided with an enthalpy-increasing suction port, the outdoor heat exchanger is provided with an upper heat exchange row and a first heat exchange pipe and a second heat exchange pipe located below the upper heat exchange row, heat exchange can be performed between the first heat exchange pipe and the second heat exchange pipe, and the first heat exchange pipe and the second heat exchange pipe are respectively located at the leeward side and the windward side in the air conditioner outdoor unit, the first heat exchange pipe is connected and arranged between the upper heat exchange row and the air conditioner indoor unit, and the second heat exchange pipe is connected and arranged between the upper heat exchange row and the enthalpy-increasing suction port of the compressor.

[0039] In the refrigeration mode, the compressor sends the refrigerant to the upper heat exchange row for heat exchange, the upper heat exchange row sends part of the refrigerant after heat exchange to the first heat exchange pipe and sends another part of the refrigerant after heat exchange to the second heat exchange pipe, the first heat exchange pipe sends the refrigerant therein to the air conditioner indoor unit for refrigeration, and the second heat exchange pipe sends the refrigerant therein to the enthalpy-increasing suction port of the compressor to increase the enthalpy of the compressor; the positions of the first heat exchange pipe and the second heat exchange pipe and the blowing of the fan of the air conditioner outdoor unit can blow part of the cold energy of the refrigerant in the second heat exchange pipe to the first heat exchange pipe to further reduce the temperature of the refrigerant flowing in the first heat exchange pipe, so that the supercooling degree of the refrigerant flowing into the air conditioner indoor unit through the first heat exchange pipe is higher, and the temperature of the refrigerant in the second heat exchange pipe increases after part of the cold energy is taken away, and the refrigerant evaporates to form gaseous refrigerant, which is more suitable for being sent to the enthalpy-increasing suction port of the compressor to increase the enthalpy of the compressor. Therefore, the air conditioner outdoor unit provided by the application does not need to additionally set a supercooler and a pipeline for additionally increasing the enthalpy of the compressor.

[0040] In the heating mode, the compressor directly sends the refrigerant to the air conditioner indoor unit for heating, the air conditioner indoor unit sends the refrigerant after heat exchange to the first heat exchange pipe to heat the first heat exchange pipe and the second heat exchange pipe in heat exchange with the first heat exchange pipe, so that the first heat exchange pipe and the second heat exchange pipe can be defrosted and prevented from icing, and thus the air conditioner outdoor unit provided by the application does not need to additionally set a defrosting / ice removing pipeline for heating the second heat exchange pipe with the effect of increasing the enthalpy. Part of the refrigerant entering the first heat exchange pipe directly flows into the upper heat exchange row for evaporation, and another part of the refrigerant in the first heat exchange pipe flows into the second heat exchange pipe, and because the second heat exchange pipe is heated by the heat from the first heat exchange pipe, the refrigerant in the second heat exchange pipe evaporates to form gaseous refrigerant, and then the second heat exchange pipe guides the refrigerant to the enthalpy-increasing suction port of the compressor to increase the enthalpy of the compressor, and the refrigerant after evaporation in the upper heat exchange row flows back to the compressor.

[0041] The air conditioner outdoor unit provided by the application does not need to additionally set a supercooler, a pipeline for increasing the enthalpy of the compressor, and a heating assembly for heating the first heat exchange pipe and the second heat exchange pipe, so that the cost of the air conditioner outdoor unit is lower, and the first heat exchange pipe and the second heat exchange pipe in the bottom layer of the outdoor heat exchanger are ingeniously used to distribute the refrigerant, and the heat exchange between the first heat exchange pipe and the second heat exchange pipe can increase the supercooling degree and the enthalpy in the refrigeration mode and can increase the enthalpy and prevent the pipeline for increasing the enthalpy from icing in the heating mode.

[0042] (2) The air conditioning system provided by the application comprises an air conditioning indoor unit and the air conditioning outdoor unit, the air conditioning indoor unit is connected with the first heat exchange pipe through a second pipe, and a second throttling valve is arranged on the second pipe. Since the air conditioning outdoor unit does not need to additionally arrange a cooler, a pipeline for increasing the enthalpy of the compressor and a heating assembly for heating the first heat exchange pipe and the second heat exchange pipe, the cost of the air conditioning system is lower. BRIEF DESCRIPTION OF DRAWINGS

[0043] In order to more clearly illustrate the technical solutions in the embodiments of 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 only constitute some embodiments of the application, and for those skilled in the art, other drawings can also be obtained from these drawings without creative labor.

[0044] Figure 1 is a structural block diagram of the air conditioning outdoor unit provided by the embodiment of the application;

[0045] Figure 2 is a structural block diagram of the air conditioning system in a refrigeration working condition (the solid arrow in the figure points to the flow direction of the refrigerant, and the hollow arrow in the figure points to the air field direction in the air conditioning outdoor unit);

[0046] Figure 3 is a structural block diagram of the air conditioning system in a heating working condition (the solid arrow in the figure points to the flow direction of the refrigerant, and the hollow arrow in the figure points to the air field direction in the air conditioning outdoor unit);

[0047] Figure 4 is a flow chart of the control method of the air conditioning system provided by the embodiment of the application.

[0048] In the figure:

[0049] 1-air conditioning outdoor unit; 2-compressor; 3-outdoor heat exchanger; 4-upper heat exchange row; 5-first heat exchange pipe; 51-first end; 52-second end; 6-second heat exchange pipe; 61-third end; 62-fourth end; 7-air conditioning indoor unit; 8-first throttling valve; 9-liquid collecting pipe; 10-capillary tube; 11-liquid distributor; 12-second throttling valve; 13-first pipe; 14-second pipe; 15-third pipe; 16-four-way valve; 17-gas-liquid separator. DETAILED DESCRIPTION

[0050] In order to make the objects, technical solutions and advantages of the present application clearer, the technical solutions of the present application will be described in detail below. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the scope of the present application.

[0051] Embodiment 1

[0052] The embodiment provides an air conditioner outdoor unit 1, which comprises an outdoor heat exchanger 3 and a compressor 2 provided with an enthalpy-increasing suction port. The outdoor heat exchanger 3 is provided with an upper heat exchange row 4 and first heat exchange pipes 5 and second heat exchange pipes 6 located below the upper heat exchange row 4. The first heat exchange pipes 5 and the second heat exchange pipes 6 can exchange heat with each other, so as to facilitate heat exchange. The first heat exchange pipes 5 and the second heat exchange pipes 6 are located at a leeward side and a windward side in the air conditioner outdoor unit 1 respectively. It should be noted that the air conditioner outdoor unit 1 further comprises a fan installed therein. Air blown by the fan first passes through the second heat exchange pipes 6 and then reaches the first heat exchange pipes 5.

[0053] The two ends of the first heat exchange pipes 5 are defined as a first end 51 and a second end 52 respectively. The two ends of the second heat exchange pipes 6 are defined as a third end 61 and a fourth end 62 respectively.

[0054] The first heat exchange pipes 5 are in communication between the upper heat exchange row 4 and an air conditioner indoor unit 7, that is, the first end 51 of the first heat exchange pipes 5 is in communication with the upper heat exchange row 4, and the second end 52 of the second heat exchange pipes 6 is in communication with the air conditioner indoor unit 7. In this way, in a refrigeration working condition, the first heat exchange pipes 5 can send part of refrigerant flowing out of the upper heat exchange row 4 into the air conditioner indoor unit 7. In a heating working condition, the first heat exchange pipes 5 can guide part of refrigerant out of the air conditioner indoor unit 7 into the upper heat exchange row 4, so as to realize normal operation of the air conditioning system.

[0055] The second heat exchange pipe 6 is connected between the upper heat exchange row 4 and the enthalpy-increasing suction port of the compressor 2, that is, the third end 61 of the second heat exchange pipe 6 is connected with the upper heat exchange row 4, and the fourth end 62 of the second heat exchange pipe 6 is connected with the enthalpy-increasing suction port of the compressor 2. More preferably, a first throttling valve 8 is arranged on the first pipe 13 connecting the second heat exchange pipe 6 and the upper heat exchange row 4, and the first throttling valve 8 is an electronic expansion valve, which throttles the refrigerant entering the second heat exchange pipe 6. In this way, the first heat exchange pipe 5 and the second heat exchange pipe 6 are connected in parallel downstream of the upper heat exchange row 4. In the refrigeration mode, another part of the refrigerant flowing out of the upper heat exchange row 4 flows into the second heat exchange pipe 6 through the first pipe 13 and is throttled by the second throttling valve 12, so that the pressure of the refrigerant entering the second throttling valve 12 is lower. In this mode, the refrigerant entering the second heat exchange pipe 6 flows into the enthalpy-increasing suction port of the compressor 2 through the second heat exchange pipe 6 to increase the enthalpy of the compressor 2. In the heating mode, another part of the refrigerant flowing out of the air conditioner indoor unit 7 flows into the second heat exchange pipe 6, and the second heat exchange pipe 6 guides the refrigerant into the enthalpy-increasing suction port of the compressor 2 to increase the enthalpy of the compressor 2.

[0056] Specifically,

[0057] In the refrigeration mode, the compressor 2 sends the refrigerant to the upper heat exchange row 4 for heat exchange, the upper heat exchange row 4 sends part of the heat-exchanged refrigerant to the first heat exchange pipe 5 and another part of the heat-exchanged refrigerant to the second heat exchange pipe 6 through the first pipe 13, the first heat exchange pipe 5 sends the refrigerant therein to the air conditioner indoor unit 7 through the second pipe 14 for refrigeration, and the second heat exchange pipe 6 sends the refrigerant therein to the enthalpy-increasing suction port of the compressor 2 to increase the enthalpy of the compressor 2. The positions of the first heat exchange pipe 5 and the second heat exchange pipe 6 and the blowing of the fan of the air conditioner outdoor unit 1 can blow part of the cold energy of the refrigerant in the second heat exchange pipe 6 to the first heat exchange pipe 5, so as to further reduce the temperature of the refrigerant flowing in the first heat exchange pipe 5, thereby making the supercooling degree of the refrigerant flowing into the air conditioner indoor unit 7 through the first heat exchange pipe 5 greater, the temperature of the refrigerant in the second heat exchange pipe 6 increases after part of the cold energy is taken away, and the refrigerant evaporates to form gaseous refrigerant, which is more suitable for being sent to the enthalpy-increasing suction port of the compressor 2 to increase the enthalpy of the compressor 2, and the refrigerant flowing into the second heat exchange pipe 6 is also throttled and reduced in pressure by the first throttling valve 8. Therefore, the air conditioner outdoor unit 1 provided by the present application does not need to additionally arrange a supercooler and a pipeline for increasing the enthalpy of the compressor 2. It should be noted that in this mode, the refrigerant flowing out of the air conditioner indoor unit 7 flows back to the gas-liquid separator 17 through the third pipe 15, and the gas-liquid separator 17 guides the refrigerant into the compressor 2.

[0058] In the heating mode, the compressor 2 directly sends the refrigerant to the air conditioner indoor unit 7 through the third pipeline 15 for heating, and the air conditioner indoor unit 7 sends the heat-exchanged refrigerant to the first heat exchange pipe 5 through the second pipeline 14 to heat the first heat exchange pipe 5 and the second heat exchange pipe 6 in heat exchange with the first heat exchange pipe 5, so that the first heat exchange pipe 5 and the second heat exchange pipe 6 can be defrosted and prevented from icing, and thus the air conditioner outdoor unit 1 of the present application does not need to additionally provide a defrosting / icing pipeline for heating the second heat exchange pipe 6 with the enthalpy increasing effect. Part of the refrigerant entering the first heat exchange pipe 5 directly flows into the upper heat exchange row 4 for evaporation, and another part of the refrigerant in the first heat exchange pipe 5 flows into the second heat exchange pipe 6 through the first pipeline 13. Since the second heat exchange pipe 6 is heated by the heat from the first heat exchange pipe 5, the refrigerant in the second heat exchange pipe 6 is evaporated to form gaseous refrigerant, which is then guided into the enthalpy increasing suction port of the compressor 2 to increase the enthalpy of the compressor 2, and the refrigerant flowing into the second heat exchange pipe 6 is throttled and depressurized by the first throttle valve 8 on the first pipeline 13, and the refrigerant evaporated in the upper heat exchange row 4 flows back to the compressor 2.

[0059] The air conditioner outdoor unit 1 of the present application further comprises a liquid collecting pipe 9, a capillary tube 10 and a distributor 11. The liquid collecting pipe 9 is connected to one end of the upper heat exchange row 4 of the outdoor heat exchanger 3 and specifically connected to the port of the compressor 2 through a four-way valve 16, and the liquid collecting pipe 9 is connected to the compressor 2 through the four-way valve 16. The capillary tube 10 is connected to the other end of the upper heat exchange row 4 and the distributor 11, and has the effect of throttling and depressurizing the refrigerant entering the distributor 11. The first heat exchange pipe 5 and the second heat exchange pipe 6 are both connected to the distributor 11, and the second heat exchange pipe 6 is connected to the distributor 11 through the first pipeline 13 on which the first throttle valve 8 is arranged. It should be noted that the upper heat exchange row 4 in the outdoor heat exchanger 3 has a plurality of upper heat exchange pipes, each of which is connected to a distributor 11 through a capillary tube 10, i.e. the number of the distributors 11 is plural, and the distributors 11 are connected through a connecting pipeline, and the first heat exchange pipe 5 and the second heat exchange pipe 6 are connected to the connecting pipeline.

[0060] Optionally, the outer walls of the first heat exchange pipe 5 and the second heat exchange pipe 6 are both provided with fins, and the fins on the first heat exchange pipe 5 and the second heat exchange pipe 6 are attached to each other to increase the heat exchange efficiency between the first heat exchange pipe 5 and the second heat exchange pipe 6. Optionally, the first heat exchange pipe 5 and the second heat exchange pipe 6 are both serpentine pipes, and the first heat exchange pipe 5 and the second heat exchange pipe 6 are arranged in a staggered manner.

[0061] It is easy to understand that the second heat exchange pipe 6 in the embodiment is actually the enthalpy-increasing pipe of the compressor 2. The first heat exchange pipe 5 and the second heat exchange pipe 6 are actually the lower heat exchange rows in the outdoor heat exchanger 3. The air conditioner outdoor unit 1 provided by the embodiment fully utilizes the lower heat exchange rows in the outdoor heat exchanger 3 to increase the supercooling degree of the refrigerant flowing into the air conditioner indoor unit 7 and increase the enthalpy of the compressor.

[0062] Embodiment 2

[0063] The embodiment provides an air conditioning system, which comprises the air conditioner indoor unit 7 and the air conditioner outdoor unit 1 provided by the embodiment 1. The air conditioner indoor unit 7 is connected to the first heat exchange pipe 5 through the second pipe 14. The second throttling valve 12 is arranged on the second pipe 14. The air conditioner indoor unit 7 is connected to the gas-liquid separator 17 through the third pipe 15. The gas-liquid separator 17 is connected to the compressor 2.

[0064] Since the air conditioner outdoor unit 1 does not need to additionally arrange a cooler, an enthalpy-increasing pipe for the compressor 2, and a heating assembly for heating the first heat exchange pipe 5 and the second heat exchange pipe 6, the cost of the air conditioning system is lower.

[0065] Embodiment 3

[0066] The embodiment further provides a control method for controlling the air conditioning system provided by the embodiment 2. The control method comprises the following steps.

[0067] Step 1: Obtain the operation mode of the air conditioning system, for example, the cooling mode and the heating mode.

[0068] Step 2: Adjust the flow direction of the refrigerant in the air conditioning system according to the operation mode of the air conditioning system. Specifically:

[0069] In the cooling mode:

[0070] The compressor 2 sends the high-temperature and high-pressure refrigerant into the upper heat exchange row 4 for heat exchange to obtain the medium-pressure two-phase refrigerant;

[0071] The upper heat exchange row 4 sends part of the medium-pressure two-phase refrigerant into the first heat exchange pipe 5 through the throttling and pressure reduction of the capillary tube 10. The upper heat exchange row 4 sends another part of the medium-pressure two-phase refrigerant into the second heat exchange pipe 6 through the throttling and pressure reduction of the capillary tube 10. The refrigerant further passes through the first throttling valve 8 on the first pipe 13 for further throttling and pressure reduction in the process of being sent into the second heat exchange pipe 6.

[0072] The fan in the air conditioner outdoor unit 1 blows air from the side of the second heat exchange pipe 6, and the air force brings part of the cold energy of the medium-pressure two-phase state refrigerant in the second heat exchange pipe 6 to the first heat exchange pipe 5 to increase the supercooling degree of the refrigerant in the first heat exchange pipe 5, and the medium-pressure two-phase state refrigerant in the second heat exchange pipe 6 that loses part of the cold energy evaporates to form gaseous refrigerant;

[0073] The refrigerant with increased supercooling degree is sent into the air conditioner indoor unit 7 through the second pipeline 14 to perform refrigeration, the refrigerant out of the air conditioner indoor unit 7 flows into the gas-liquid separator 17 through the third pipeline 15 and finally flows back to the compressor 2, and the gaseous refrigerant is sent into the enthalpy-increasing suction port of the compressor 2 through the second heat exchange pipe 6 to increase the enthalpy of the compressor 2.

[0074] In the heating mode:

[0075] The high-temperature and high-pressure refrigerant is sent into the air conditioner indoor unit 7 through the third pipeline 15 by the compressor 2 to perform heating, and the condensed refrigerant is obtained;

[0076] The condensed refrigerant in the air conditioner indoor unit 7 is sent to the second throttling valve 12 through the second pipeline 14, the condensed refrigerant is throttled and decompressed by the second throttling valve 12, and the low-pressure two-phase state refrigerant is obtained;

[0077] The low-pressure two-phase state refrigerant is sent into the first heat exchange pipe 5 through the second pipeline 14 to heat the first heat exchange pipe 5 and the second heat exchange pipe 6 in heat exchange with the first heat exchange pipe 5;

[0078] Part of the low-pressure two-phase state refrigerant is sent into the upper heat exchange row 4 to evaporate by the first heat exchange pipe 5, and another part of the low-pressure two-phase state refrigerant is sent into the second heat exchange pipe 6 by the first heat exchange pipe 5;

[0079] The second heat exchange pipe 6 heated by the first heat exchange pipe 5 heats the incoming low-pressure two-phase state refrigerant, so that the low-pressure two-phase state refrigerant in the second heat exchange pipe 6 evaporates into gaseous refrigerant;

[0080] The evaporated refrigerant is sent back to the compressor 2 by the upper heat exchange row 4, and the gaseous refrigerant is sent into the enthalpy-increasing suction port of the compressor 2 by the second heat exchange pipe 6 to increase the enthalpy of the compressor 2.

[0081] In the refrigeration working condition, the refrigerant temperature in the first heat exchange pipe 5 is further reduced by the cold energy transferred from the second heat exchange pipe 6 to the first heat exchange pipe 5, so that the refrigerant flowing into the air conditioner indoor unit 7 through the first heat exchange pipe 5 has a higher supercooling degree, and therefore an additional supercooler does not need to be installed in the outdoor unit, thereby saving cost.

[0082] The second heat exchange pipe 6 sends the refrigerant into the supercharged suction port of the compressor 2 to increase the enthalpy of the compressor 2. Since the second heat exchange pipe 6 is a pipe provided in the outdoor heat exchanger 3, the pipe for increasing the enthalpy of the compressor 2 does not need to be additionally provided in the air conditioner outdoor unit 1, thereby further reducing the cost. It can be understood that the second heat exchange pipe 6 in the embodiment is actually the enthalpy increasing pipe of the compressor 2.

[0083] In the heating condition, the first heat exchange pipe 5 and the second heat exchange pipe 6 adjacent to the first heat exchange pipe 5 are heated by the refrigerant flowing into the first heat exchange pipe 5 from the air conditioner indoor unit 7, so that a heating assembly for heating the enthalpy increasing pipe does not need to be additionally provided in the air conditioner outdoor unit 1, thereby further reducing the cost.

[0084] The above merely illustrates the specific embodiments of the present application, but the protection scope of the present application is not limited to this. Any person skilled in the art can easily think of the changes or replacements within the technical range disclosed in the present application, which should be covered in the protection scope of the present application. Therefore, the protection scope of the present application should be subject to the protection scope of the claims.

Claims

1. An air conditioner outdoor unit characterized by comprising: The air conditioner outdoor unit comprises: a compressor provided with an enthalpy-increasing suction port; an outdoor heat exchanger provided with an upper heat exchange row and first and second heat exchange tubes located below the upper heat exchange row; the first heat exchange tube is in communication between the upper heat exchange row and an air conditioner indoor unit; the second heat exchange tube is in communication between the upper heat exchange row and the enthalpy-increasing suction port of the compressor; the first and second heat exchange tubes are respectively located at a leeward side and a windward side in the air conditioner outdoor unit; and heat exchange is performed between the first and second heat exchange tubes.

2. The outdoor unit of claim 1, wherein Further comprising: a first throttling valve provided on a first pipeline in communication between the second heat exchange tube and the upper heat exchange row.

3. The air conditioner outdoor unit according to claim 2, wherein: the first throttling valve is an electronic expansion valve.

4. The outdoor unit of claim 2, wherein Further comprising: a liquid collecting pipe in communication between the compressor and one end of the upper heat exchange row; a capillary tube and a distributor, the capillary tube being in communication between the distributor and the other end of the upper heat exchange row; the first and second heat exchange tubes are both in communication with the distributor; the first throttling valve is provided on a first pipeline in communication between the second heat exchange tube and the distributor.

5. The air conditioner outdoor unit according to any one of claims 1-4, wherein: fins are provided on the outer walls of the first and second heat exchange tubes, the fins on the first heat exchange tube being in contact with the fins on the second heat exchange tube; the first and second heat exchange tubes are respectively located at a leeward side and a windward side in the air conditioner outdoor unit.

6. The air conditioner outdoor unit according to any one of claims 1-4, wherein: the first and second heat exchange tubes are both serpentine tubes, and the first and second heat exchange tubes are arranged in a staggered manner.

7. An air conditioning system characterized by comprising: The air conditioner comprises: an air conditioner indoor unit; the air conditioner outdoor unit according to any one of claims 1-6, the air conditioner indoor unit being in communication with the first heat exchange tube through a second pipeline, and a second throttling valve being provided on the second pipeline.

8. The control method of the air conditioning system according to claim 7, characterized by, The control method comprises: acquiring an operation mode of the air conditioner system; adjusting the flow direction of refrigerant in the air conditioner system according to the operation mode of the air conditioner system.

9. The control method according to claim 8, wherein: the operation mode of the air conditioner system is a refrigeration mode, and the method comprises: sending high-temperature and high-pressure refrigerant into the upper heat exchange row by a compressor to perform heat exchange, so as to obtain medium-pressure two-phase-state refrigerant; sending part of the medium-pressure two-phase-state refrigerant into the first heat exchange tube by the upper heat exchange row, and sending another part of the medium-pressure two-phase-state refrigerant into the second heat exchange tube by the upper heat exchange row; blowing air from the side of the second heat exchange tube by a fan in the air conditioner outdoor unit, and using the air force to bring part of the cold energy of the medium-pressure two-phase-state refrigerant in the second heat exchange tube to the first heat exchange tube to increase the supercooling degree of the refrigerant in the first heat exchange tube, and the medium-pressure two-phase-state refrigerant losing part of the cold energy in the second heat exchange tube evaporates to form gaseous refrigerant. The first heat exchange pipe is used to send the refrigerant with increased supercooling degree to the air conditioner indoor unit to perform refrigeration, and the second heat exchange pipe is used to send the gaseous refrigerant to the enthalpy-increasing suction port of the compressor to perform enthalpy-increasing on the compressor.

10. The control method of claim 8, wherein: The operation mode of the air conditioning system is a heating mode, and the method comprises: The compressor is used to send high-temperature and high-pressure refrigerant to the air conditioner indoor unit to perform heating, and condensed refrigerant is obtained; The second pipeline is used to send the condensed refrigerant in the air conditioner indoor unit to the second throttling valve, the second throttling valve is used to throttle and depressurize the condensed refrigerant, and low-pressure two-phase refrigerant is obtained; The second pipeline is used to send the low-pressure two-phase refrigerant to the first heat exchange pipe to heat the first heat exchange pipe and the second heat exchange pipe attached to the first heat exchange pipe; The first heat exchange pipe is used to send part of the low-pressure two-phase refrigerant to the upper heat exchange row to perform evaporation, and the first heat exchange pipe is used to send another part of the low-pressure two-phase refrigerant to the second heat exchange pipe; The second heat exchange pipe heated by the first heat exchange pipe is used to heat the incoming low-pressure two-phase refrigerant, so that the low-pressure two-phase refrigerant in the second heat exchange pipe is evaporated into gaseous refrigerant; The upper heat exchange row is used to send the evaporated refrigerant back to the compressor, and the second heat exchange pipe is used to send the gaseous refrigerant to the enthalpy-increasing suction port of the compressor to perform enthalpy-increasing on the compressor.

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