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

Abstract

The present invention relates to an outdoor air conditioner, an air conditioning system, and a control method thereof, and belongs to the technical field of air conditioning. The outdoor unit includes a compressor; a first four-way valve, whose D port and S port are respectively connected to the outlet and inlet of the compressor, and the outlet of the compressor is connected to the high-pressure gas side pipe; an outdoor heat exchanger, which is connected to the C port of the first four-way valve; a subcooler, which is connected to the outdoor heat exchanger via a first pipeline, a first valve is provided on the first pipeline, and the subcooler is connected to the liquid side pipe; a second four-way valve, whose D port, S port, and C port are respectively connected to the E port of the first four-way valve, the inlet of the compressor, and the low-pressure gas side pipe, and the E port of the second four-way valve is connected to the first pipeline via a second pipeline; and an energy storage module, which is connected and provided on the second pipeline, and a second valve is provided on the second pipeline, and the second valve is located between the energy storage module and the first pipeline. An air conditioning system employs the outdoor unit. The air conditioning system can simultaneously defrost the outdoor heat exchanger and provide heating.

Description

Technical Field

[0001] The present invention belongs to the technical field of air conditioning, and in particular relates to an air conditioning outdoor unit, an air conditioning system and a control method thereof. Background Art

[0002] Existing air conditioning systems can achieve different functions, including cooling, heating, and defrosting. In defrost mode, the high-temperature, high-pressure refrigerant in the unit is delivered by the compressor to the outdoor heat exchanger to defrost the fins. However, the refrigerant passing through the outdoor heat exchanger also flows into the indoor unit. Therefore, the indoor unit's fan must be turned off in defrost mode. At this time, the refrigerant entering the indoor unit is not hot. If the indoor unit's fan is turned on, the indoor unit will blow cold air. Defrost mode is typically used in cold weather, and blowing cold air will further exacerbate the cold. In other words, existing air conditioning systems cannot heat in defrost mode, affecting the user experience. Summary of the Invention

[0003] The present invention provides an air-conditioning outdoor unit, an air-conditioning system and a control method thereof, which are used to solve the technical problem in the prior art that the air-conditioning system cannot generate heat in a defrost mode.

[0004] The present invention is implemented through the following technical solution: an air conditioner outdoor unit, comprising:

[0005] compressor;

[0006] a first four-way valve, wherein a D port and an S port of the first four-way valve are respectively connected to the outlet and the inlet of the compressor, and the outlet of the compressor is connected to the high-pressure gas side pipe of the three-pipe indoor unit;

[0007] an outdoor heat exchanger connected to port C of the first four-way valve;

[0008] a subcooler connected to the outdoor heat exchanger via a first pipeline, wherein a first valve is provided on the first pipeline, and the subcooler is connected to the liquid side pipe of the three-pipe indoor unit;

[0009] a second four-way valve, wherein port D of the second four-way valve is connected to port E of the first four-way valve, port S of the second four-way valve is connected to the inlet of the compressor, port C of the second four-way valve is connected to the low-pressure gas side pipe of the three-pipe indoor unit, port E of the second four-way valve is connected to the first pipe through a second pipe, and the position where the second pipe connects to the first pipe is located between the first valve and the subcooler;

[0010] The energy storage module is connected to the second pipeline, a second valve is provided on the second pipeline, and the second valve is located between the energy storage module and the first pipeline.

[0011] Furthermore, in order to better implement the present invention, the energy storage module includes a shell and an energy storage body, the shell is provided with an energy storage cavity and a heat exchange flow channel, the energy storage body is installed in the energy storage cavity, and the heat exchange flow channel is connected to the second pipeline.

[0012] Furthermore, in order to better implement the present invention, the energy storage body is a phase change material.

[0013] Furthermore, in order to better implement the present invention, the phase change material is paraffin.

[0014] Furthermore, in order to better implement the present invention, the first valve and / or the second valve is an electronic expansion valve.

[0015] The air conditioning system provided by the present invention comprises:

[0016] A three-pipe indoor unit is connected to a high-pressure gas side pipe, a low-pressure gas side pipe, and a liquid side pipe, wherein the high-pressure gas side pipe, the low-pressure gas side pipe, and the liquid side pipe are respectively provided with a third valve, a fourth valve, and a fifth valve;

[0017] In the above-mentioned air-conditioning outdoor unit, the high-pressure gas side pipe, the low-pressure gas side pipe and the liquid side pipe of the three-pipe indoor unit are respectively connected to the outlet of the compressor, the C port of the second four-way valve and the subcooler.

[0018] The control method of the air conditioning system provided by the present invention includes:

[0019] Obtaining an operating mode of the air conditioning system;

[0020] The first four-way valve, the second four-way valve, the first valve, the second valve, the third valve, the fourth valve, and the fifth valve are opened and closed according to the operating mode of the air-conditioning system.

[0021] Furthermore, in order to better implement the present invention, the operating mode of the air-conditioning system is a heating energy storage mode, and the method includes:

[0022] Controlling the first four-way valve and the second four-way valve to be energized, so that port D of the first four-way valve is connected to port E and port C is connected to port S, and port D of the second four-way valve is connected to port E and port C is connected to port S, so that part of the refrigerant flowing out of the compressor flows through port D and port E of the first four-way valve and port D and port E of the first four-way valve in sequence, and then flows into the second pipeline and performs heat exchange with the energy storage module, and the energy storage module absorbs heat to store energy;

[0023] controlling the second valve to open so that the refrigerant in the second pipeline flows into the first pipeline;

[0024] Controlling the third valve to open so that another portion of the refrigerant flowing out of the compressor flows through the high-pressure gas side pipe into the indoor heat exchanger of the three-pipe indoor unit for heating, and using the indoor heat exchanger to introduce this portion of the refrigerant into the liquid side pipe;

[0025] controlling the fifth valve to open so that the refrigerant in the liquid-side pipe flows into the subcooler and is introduced into the first pipeline through the subcooler;

[0026] controlling the first valve to open so as to guide the refrigerant in the first pipe into the outdoor heat exchanger for evaporation;

[0027] The evaporated refrigerant is introduced into the first four-way valve through the C port of the first four-way valve by using the outdoor heat exchange gas and flows back to the inlet of the compressor through the S port of the first four-way valve.

[0028] Furthermore, in order to better implement the present invention, the operating mode of the air-conditioning system is a heating and defrosting mode, and the method includes:

[0029] Controlling the first four-way valve and the second four-way valve to be de-energized, so that port D of the first four-way valve is connected to port C and port E is connected to port S, and port D of the second four-way valve is connected to port C and port E is connected to port S, so that part of the refrigerant flowing out of the compressor flows through port D and port C of the first four-way valve in sequence and then enters the outdoor heat exchanger to defrost the outdoor heat exchanger;

[0030] controlling the first valve to open so that the portion of refrigerant in the outdoor heat exchanger flows into the first pipeline;

[0031] Controlling the third valve to open so that another portion of the refrigerant flowing out of the compressor flows through the high-pressure gas side pipe into the indoor heat exchanger of the three-pipe indoor unit for heating, and using the indoor heat exchanger to introduce this portion of the refrigerant into the liquid side pipe;

[0032] controlling the fifth valve to open so that the refrigerant in the liquid-side pipe flows into the subcooler and is introduced into the first pipeline through the subcooler;

[0033] Controlling the second valve to open so that the refrigerant in the first pipeline flows into the second pipeline, and the energy storage module releases the stored heat to heat the refrigerant flowing into the second pipeline;

[0034] The refrigerant heated in the second pipeline flows into the E port of the second four-way valve and flows back to the inlet of the compressor through the S port of the second four-way valve.

[0035] Furthermore, in order to better implement the present invention, the operating mode of the air-conditioning system is a cooling mode, and the method includes:

[0036] Controlling the first four-way valve and the second four-way valve to be de-energized, so that port D of the first four-way valve is connected to port C and port E is connected to port S, and port D of the second four-way valve is connected to port C and port E is connected to port S, and controlling the third valve to be closed so that the refrigerant flowing out of the compressor flows through port D and port C of the first four-way valve in sequence and then enters the outdoor heat exchanger for condensation;

[0037] Controlling the first valve to open and the second valve to close, so that the refrigerant flowing out of the outdoor heat exchanger flows into the subcooler through the first pipeline for subcooling;

[0038] controlling the fifth valve to open so that the refrigerant flowing out of the subcooler flows into the indoor heat exchanger through the liquid side pipe for cooling;

[0039] Controlling the fourth valve to open so that the refrigerant flowing out of the indoor heat exchanger is introduced into the C port of the second four-way valve through the low-pressure gas side pipe;

[0040] The refrigerant entering port C of the second four-way valve flows successively through port D of the second four-way valve, port E of the first four-way valve and port S of the first four-way valve, and then flows back to the inlet of the compressor through port S of the first four-way valve.

[0041] Compared with the prior art, the present invention has the following beneficial effects:

[0042] (1) The air-conditioning outdoor unit provided by the present invention includes a compressor, a first four-way valve, an outdoor heat exchanger, a subcooler, a second four-way valve and an energy storage module, the D port and the S port of the first four-way valve are respectively connected to the outlet and the inlet of the compressor, and the outlet of the compressor is connected to the high-pressure gas side pipe of the three-pipe indoor unit, the outdoor heat exchanger is connected to the C port of the first four-way valve, the subcooler is connected to the outdoor heat exchanger through a first pipeline, a first valve is provided on the first pipeline, the subcooler is further connected to the liquid side pipe of the three-pipe indoor unit, the D port of the second four-way valve is connected to the E port of the first four-way valve, the S port of the second four-way valve is connected to the inlet of the compressor, the C port of the second four-way valve is connected to the low-pressure gas side pipe of the three-pipe indoor unit, the E port of the second four-way valve is connected to the first pipeline through a second pipeline, and the position where the second pipeline connects to the first pipeline is located between the first valve and the subcooler, the energy storage module is connected and arranged on the second pipeline, a second valve is provided on the second pipeline, and the second valve is located between the energy storage module and the first pipeline.

[0043] Through the above structure, when the air-conditioning outdoor unit is used in conjunction with the three-pipe indoor unit, it can achieve different working conditions such as cooling, heating energy storage and heating defrosting.

[0044] In heating and energy storage mode, both the first and second four-way valves are energized. Ports D and E of the first four-way valve are connected, and ports C and S are connected. Ports D and E of the second four-way valve are connected, and ports C and S are connected. A portion of the refrigerant from the compressor flows through ports D and E of the first four-way valve and into ports D and E of the second four-way valve. It then enters the second pipeline and undergoes heat exchange with the energy storage module, which absorbs heat to store energy. The first and second valves are both open, and the refrigerant, after absorbing heat from the energy storage module, flows into the first pipeline. Another portion of the refrigerant from the compressor flows directly into the high-pressure gas pipe of the three-pipe indoor unit and reaches the indoor heat exchanger for heating. After heating in the indoor heat exchanger, the refrigerant flows back to the subcooler through the liquid pipe and then flows through the subcooler into the first pipeline. At this point, the refrigerant absorbed by the energy absorption module and the refrigerant heated in the indoor heat exchanger merge in the first pipeline. After merging, it flows through the first valve and reaches the outdoor heat exchanger for evaporation. The evaporated refrigerant then flows into port C of the first four-way valve and back to the compressor inlet through port S of the first four-way valve. In heating and energy storage mode, this not only provides high-pressure, high-temperature refrigerant to the indoor heat exchanger for heating, but also heats and stores energy in the energy storage module.

[0045] In heating and defrosting mode, the first and second four-way valves are both de-energized. Ports D and C of the first four-way valve are connected, and ports E and S are connected. Ports D and C of the second four-way valve are connected, and ports E and S are connected. A portion of the refrigerant from the compressor enters the outdoor heat exchanger through ports D and C of the first four-way valve to defrost the outdoor heat exchanger. With the first and second valves both open, the defrosted and cooled refrigerant flows through the first pipeline and into the second pipeline. The remaining portion of the refrigerant from the compressor flows directly into the high-pressure gas pipe of the three-pipe indoor unit and reaches the indoor heat exchanger for heating. After heating in the indoor heat exchanger, the refrigerant flows back to the subcooler through the liquid pipe, then flows through the subcooler into the first pipeline, and then through the first pipeline to the second pipeline. At this point, the refrigerant that has defrosted and cooled the outdoor heat exchanger and the refrigerant that has heated the indoor heat exchanger merge in the second pipeline. After merging, it flows through the second valve and reaches the energy storage module. The energy storage module releases heat to heat the refrigerant in the second pipeline. At this point, the energy storage module acts as an evaporator, converting the refrigerant flowing through the energy storage module into gaseous refrigerant. The second pipeline directs the evaporated refrigerant to port E of the second four-way valve and then flows back to the compressor inlet through port S of the second four-way valve. In heating and defrosting mode, not only can the outdoor heat exchanger be defrosted, but high-pressure, high-temperature refrigerant can also be supplied to the indoor heat exchanger for heating.

[0046] (2) The air-conditioning system provided by the present invention includes a three-pipe indoor unit and the above-mentioned air-conditioning outdoor unit. The three-pipe indoor unit is connected with a high-pressure gas side pipe, a low-pressure gas side pipe and a liquid side pipe. The high-pressure gas side pipe, the low-pressure gas side pipe and the liquid side pipe are respectively provided with a third valve, a fourth valve and a fifth valve. The high-pressure gas side pipe, the low-pressure gas side pipe and the liquid side pipe are respectively connected with the outlet of the compressor, the C port of the second four-way valve and the subcooler. Therefore, the air-conditioning system provided by the present invention can realize different modes such as refrigeration, heating energy storage and heating defrosting. In the heating defrosting mode, not only can the outdoor heat exchanger be defrosted, but also high-temperature refrigerant can be supplied to the air-conditioning indoor unit for heating. In this way, the air-conditioning system can realize continuous heating in a cold environment in winter. Even when the outdoor heat exchanger is defrosted, it can still realize heating, which is more practical and provides a better user experience.

[0047] In addition, in the heating energy storage mode, the third valve and the fifth valve are both open, and the fourth valve is closed. In the heating defrost mode, the third valve and the fifth valve are also open, and the fourth valve is closed. Therefore, when switching between the heating energy storage mode and the heating defrost mode, the valve on the air conditioner indoor unit side does not need to be adjusted, and no valve adjustment noise caused by mode change will be generated indoors. BRIEF DESCRIPTION OF THE DRAWINGS

[0048] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following briefly introduces the drawings required for use in the description of the invention or the prior art. Obviously, the drawings described below are only some of the inventions of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0049] Figure 1 This is a structural block diagram of an air-conditioning outdoor unit provided by an embodiment of the present invention;

[0050] Figure 2 : is a schematic diagram of the air-conditioning system in the heating energy storage mode provided by an embodiment of the present invention (the solid arrows in the figure indicate the direction of refrigerant flow);

[0051] Figure 3 : is a schematic diagram of the air-conditioning system in the heating and defrosting mode provided by an embodiment of the present invention (the solid arrows in the figure indicate the direction of refrigerant flow);

[0052] Figure 4 : is a schematic diagram of an air-conditioning system in cooling mode provided by an embodiment of the present invention (the solid arrows in the figure indicate the direction of refrigerant flow);

[0053] Figure 5 is a flow chart of a method for controlling an air-conditioning system provided by an embodiment of the present invention;

[0054] Figure 6Schematic diagram of the structure of the energy storage module in an embodiment of the present invention.

[0055] In the picture:

[0056] 1-compressor; 2-first four-way valve; 3-indoor heat exchanger; 4-high-pressure gas side pipe; 41-third valve; 5-outdoor heat exchanger; 6-subcooler; 7-first pipeline; 8-first valve; 9-liquid side pipe; 91-fifth valve; 10-second four-way valve; 11-low-pressure gas side pipe; 111-fourth valve; 12-second pipeline; 13-energy storage module; 131-housing; 132-energy storage body; 133-heat exchange flow channel; 14-second valve; 15-oil separator; 16-gas-liquid separator. DETAILED DESCRIPTION

[0057] To make the objectives, technical solutions, and advantages of the present invention more clear, the technical solutions of the present invention will be described in detail below. Obviously, the invention described is only a part of the invention of the present invention, not the entire invention. Based on the invention of the present invention, all other embodiments obtained by ordinary technicians in this field without making any creative efforts are within the scope of protection of the present invention.

[0058] Example 1:

[0059] like Figure 1As shown, this embodiment provides an air-conditioning outdoor unit, which includes a compressor 1, a first four-way valve 2, an outdoor heat exchanger 5, a subcooler 6, a second four-way valve 10 and an energy storage module 13. The D port and S port of the first four-way valve 2 are respectively connected to the outlet and inlet of the compressor 1, and the outlet of the compressor 1 is connected to the high-pressure gas side pipe 4 of the three-pipe indoor unit. The outdoor heat exchanger 5 is connected to the C port of the first four-way valve 2. The subcooler 6 is connected to the outdoor heat exchanger 5 through a first pipe 7. The first pipe 7 is provided with a first valve 8. The subcooler 6 is further connected to the liquid side pipe 9 of the three-pipe indoor unit. The D port of the second four-way valve 10 is connected to the E port of the first four-way valve 2, the S port of the second four-way valve 10 is connected to the inlet of the compressor 1, the C port of the second four-way valve 10 is connected to the low-pressure gas side pipe 11 of the three-pipe indoor unit, and the E port of the second four-way valve 10 is connected to the first pipe 7 through the second pipe 12. The position where the second pipe 12 connects to the first pipe 7 is located between the first valve 8 and the subcooler 6. The energy storage module 13 is connected and arranged on the second pipe 12. The second valve 14 is provided on the second pipe 12. The second valve 14 is located between the energy storage module 13 and the first pipe 7. In addition, the outdoor unit further includes an oil separator 15 and a gas-liquid separator 16. The oil separator 15 is arranged in communication with the outlet of the compressor 1. The pipeline exiting the oil separator 15 is further connected to the D port of the first four-way valve 2 and the high-pressure gas side pipe 4, thereby removing oil from the refrigerant exiting the compressor 1. The gas-liquid separator 16 is arranged in communication with the inlet of the compressor 1. The S port of the first four-way valve 2 and the S port of the second four-way valve 10 are both connected to the gas-liquid separator 16, thereby removing liquid from the refrigerant entering the inlet of the compressor 1. Optionally, the first valve 8 and / or the second valve 14 in this embodiment are electronic expansion valves.

[0060] Through the above structure, when the air-conditioning outdoor unit is used in conjunction with the three-pipe indoor unit, it can achieve different working conditions such as cooling, heating energy storage and heating defrosting.

[0061] In heating and energy storage mode, both the first and second four-way valves 2 and 10 are energized. Ports D and E of the first four-way valve 2 are connected, and ports C and S are connected. Ports D and E of the second four-way valve 10 are connected, and ports C and S are connected. A portion of the refrigerant from compressor 1 flows through ports D and E of the first four-way valve 2 and into ports D and E of the second four-way valve 10. It then enters the second pipeline 12 and undergoes heat exchange with the energy storage module 13, which absorbs heat to store energy. The first and second valves 8 and 14 are both open, and the refrigerant, after absorbing heat from the energy storage module 13, flows into the first pipeline 7. The remaining portion of the refrigerant from compressor 1 flows directly into the high-pressure gas pipe 4 of the three-pipe indoor unit and reaches the indoor heat exchanger 3 for heating. After heating in the indoor heat exchanger 3, the refrigerant flows back to the subcooler 6 via the liquid pipe 9, then flows through the subcooler 6 into the first pipeline 7. At this point, the refrigerant absorbed by the energy absorption module and the refrigerant heated in the indoor heat exchanger 3 merge in the first pipeline 7. After merging, it flows through the first valve 8 and reaches the outdoor heat exchanger 5 for evaporation. The evaporated refrigerant then flows into port C of the first four-way valve 2 and back to the inlet of the compressor 1 through port S of the first four-way valve 2. In the heating and energy storage mode, high-pressure, high-temperature refrigerant is not only supplied to the indoor heat exchanger 3 for heating, but also heats and stores energy in the energy storage module 13.

[0062] In heating and defrosting mode, both the first and second four-way valves 2 and 10 are de-energized. Ports D and C of the first four-way valve 2 are connected, and ports E and S are connected. Ports D and C of the second four-way valve 10 are connected, and ports E and S are connected. A portion of the refrigerant from compressor 1 flows through ports D and C of the first four-way valve 2 into the outdoor heat exchanger 5 to defrost the outdoor heat exchanger 5. The first and second valves 8 and 14 are both open, and the defrosted and cooled refrigerant flows through first pipeline 7 and into second pipeline 12. The remaining portion of the refrigerant from compressor 1 flows directly into the high-pressure gas pipe 4 of the three-pipe indoor unit and reaches the indoor heat exchanger 3 for heating. After heating in the indoor heat exchanger 3, the refrigerant flows back to the subcooler 6 via the liquid pipe 9, then flows through the subcooler 6 into the first pipeline 7, and then through the first pipeline 7 into the second pipeline 12. At this point, the refrigerant that has defrosted and cooled the outdoor heat exchanger 5 and the refrigerant that has heated the indoor heat exchanger 3 merge in the second pipeline 12. After merging, it flows through the second valve 14 and reaches the energy storage module 13. The energy storage module 13 releases heat to heat the refrigerant in the second pipeline 12. At this time, the energy storage module 13 acts as an evaporator, converting the refrigerant flowing through the energy storage module 13 into a gaseous refrigerant. The second pipeline 12 guides the evaporated refrigerant into the E port of the second four-way valve 10 and flows back to the inlet of the compressor 1 through the S port of the second four-way valve 10. In the heating and defrosting mode, not only can the outdoor heat exchanger 5 be defrosted, but the indoor heat exchanger 3 can also be supplied with high-pressure and high-temperature refrigerant for heating.

[0063] In cooling mode, the first four-way valve 2 and the second four-way valve 10 are both de-energized. At this time, the D port of the first four-way valve 2 is connected to the C port and the E port is connected to the S port, the D port of the second four-way valve 10 is connected to the C port and the E port is connected to the S port, the high-pressure gas side pipe 4 of the three-pipe indoor unit is disconnected, and the refrigerant from the compressor 1 enters the outdoor heat exchanger 5 through the D port and the C port of the first four-way valve 2 for condensation. The first valve 8 is opened, the second valve 14 is disconnected, and the refrigerant condensed by the outdoor heat exchanger 5 passes through The first pipeline 7 is introduced into the subcooler 6 for subcooling. The subcooled refrigerant then enters the outdoor heat exchanger 5 through the liquid side pipe 9 for refrigeration. The refrigerant evaporated in the indoor heat exchanger 3 is then introduced into the C port of the second four-way valve 10 through the low-pressure gas side pipe 11. The refrigerant entering the C port of the second four-way valve 10 flows through the D port of the second four-way valve 10, the E port of the first four-way valve 2, and the S port of the first four-way valve 2, and then flows back to the inlet of the compressor 1 through the S port of the first four-way valve 2, thereby achieving refrigeration. In this mode, the energy storage module 13 and the second pipeline 12 are not used. The specific implementation method is to close the second valve 14.

[0064] It's worth noting that in cooling mode, subcooler 6 operates to subcool the refrigerant. However, in heating and energy storage and heating and defrost modes, subcooler 6 merely serves as a flow diverter and does not subcool the refrigerant. This is achieved by controlling the opening and closing of the subcooler's built-in electronic expansion valve. In cooling mode, the subcooler's built-in electronic expansion valve is opened, and in heating and energy storage and heating and defrost modes, the subcooler's built-in electronic expansion valve is closed.

[0065] An optional embodiment of the present invention is as follows: Figure 6 As shown, the energy storage module 13 includes a housing 131 and an energy storage body 132. The housing 131 is provided with an energy storage chamber and a heat exchange channel 133. The energy storage body 132 is housed in the energy storage chamber, and the heat exchange channel 133 is connected to the second pipeline 12. The energy storage body 132 is a phase change material. Of course, the energy storage body 132 can also be water or a mixed liquid. Specifically, the energy storage body 132 is paraffin.

[0066] In heating and energy storage mode, the high-temperature refrigerant flowing through second pipeline 12 heats the paraffin wax in the energy storage chamber, causing it to transform from a solid state to a liquid state, thereby storing energy. In heating and defrosting mode, the low-temperature refrigerant entering second pipeline 12 flows through heat exchange channel 133. Since the temperature of the liquid paraffin wax is higher than that of the refrigerant in second pipeline 12, the liquid paraffin wax releases heat, heating the refrigerant in second pipeline 12, gradually transforming the paraffin wax from a liquid state to a solid state.

[0067] Example 2:

[0068] This embodiment provides an air conditioning system, which includes a three-pipe indoor unit and the air conditioning outdoor unit provided in Example 1. The three-pipe indoor unit is connected by a high-pressure gas side pipe 4, a low-pressure gas side pipe 11, and a liquid side pipe 9. The high-pressure gas side pipe 4, the low-pressure gas side pipe 11, and the liquid side pipe 9 are respectively provided with a third valve 41, a fourth valve 111, and a fifth valve 91. The high-pressure gas side pipe 4, the low-pressure gas side pipe 11, and the liquid side pipe 9 are respectively connected to the outlet of the compressor 1, the C port of the second four-way valve 10, and the subcooler 6. Therefore, the air conditioning system provided by the present invention can realize different modes such as cooling, heating energy storage, and heating defrosting. In the heating defrost mode, not only can the outdoor heat exchanger 5 be defrosted, but high-temperature refrigerant can also be supplied to the air conditioning indoor unit for heating. In this way, the air conditioning system can achieve continuous heating in cold winter environments. Even when the outdoor heat exchanger 5 is defrosted, it can still achieve heating, which is more practical and provides a better user experience.

[0069] Specifically:

[0070] In heating storage mode, if Figure 2 As shown, both the first four-way valve 2 and the second four-way valve 10 are energized. At this point, port D of the first four-way valve 2 is connected to port E, and port C is connected to port S. Port D of the second four-way valve 10 is connected to port E, and port C is connected to port S. A portion of the refrigerant from the compressor 1 flows through ports D and E of the first four-way valve 2 and into ports D and E of the second four-way valve 10. It then enters the second pipeline 12 and undergoes heat exchange with the energy storage module 13, where it absorbs heat and stores energy. The first valve 8 and the second valve 14 are both open, and the refrigerant after heat absorption by the energy storage module 13 flows into the first pipeline 7. The third valve 41 and the fifth valve 91 are opened, and the fourth valve 111 is closed. Another portion of the refrigerant from the compressor 1 flows directly into the high-pressure gas pipe 4 of the three-pipe indoor unit and reaches the indoor heat exchanger 3 for heating. After heating in the indoor heat exchanger 3, the refrigerant flows back to the subcooler 6 through the liquid pipe 9 and then flows through the subcooler 6 into the first pipeline 7. At this point, the refrigerant absorbed by the energy absorption module and the refrigerant heated in the indoor heat exchanger 3 merge in the first pipeline 7. After merging, it flows through the first valve 8 and reaches the outdoor heat exchanger 5 for evaporation. The evaporated refrigerant flows into the C port of the first four-way valve 2 and flows back to the inlet of the compressor 1 through the S port of the first four-way valve 2. In the heating energy storage mode, not only can high-pressure and high-temperature refrigerant be provided to the indoor heat exchanger 3 for heating, but it can also be used to heat and store energy in the energy storage module 13. In this mode, the electronic expansion valve of the above-mentioned subcooler 6 needs to be closed.

[0071] In heating and defrosting mode, if Figure 3As shown, both the first four-way valve 2 and the second four-way valve 10 are de-energized. At this point, port D of the first four-way valve 2 is connected to port C, and port E is connected to port S. Port D of the second four-way valve 10 is connected to port C, and port E is connected to port S. A portion of the refrigerant from the compressor 1 enters the outdoor heat exchanger 5 through ports D and C of the first four-way valve 2 to defrost the outdoor heat exchanger 5. The first valve 8 and the second valve 14 are both open, and the defrosted and cooled refrigerant flows through the first pipeline 7 and into the second pipeline 12. The third valve 41 and the fifth valve 91 are opened, and the fourth valve 111 is closed. The remaining portion of the refrigerant from the compressor 1 flows directly into the high-pressure gas pipe 4 of the three-pipe indoor unit and reaches the indoor heat exchanger 3 for heating. After heating in the indoor heat exchanger 3, the refrigerant flows back to the subcooler 6 through the liquid pipe 9, then flows through the subcooler 6 into the first pipeline 7, and then through the first pipeline 7 into the second pipeline 12. At this time, the refrigerant after defrosting and cooling the outdoor heat exchanger 5 and the refrigerant after heating the indoor heat exchanger 3 merge in the second pipeline 12. After merging, they flow through the second valve 14 and reach the energy storage module 13. The energy storage module 13 releases heat to heat the refrigerant in the second pipeline 12. At this time, the energy storage module 13 acts as an evaporator, so that the refrigerant flowing through the energy storage module 13 is converted into a gaseous refrigerant. The second pipeline 12 guides the evaporated refrigerant into the E port of the second four-way valve 10 and flows back to the inlet of the compressor 1 through the S port of the second four-way valve 10. In the heating defrost mode, not only can the outdoor heat exchanger 5 be defrosted, but also high-pressure and high-temperature refrigerant can be provided to the indoor heat exchanger 3 for heating. In this mode, the electronic expansion valve of the above-mentioned subcooler 6 needs to be closed.

[0072] In cooling mode, if Figure 4As shown, the first four-way valve 2 and the second four-way valve 10 are both de-energized. At this time, the D port of the first four-way valve 2 is connected to the C port and the E port is connected to the S port. The D port of the second four-way valve 10 is connected to the C port and the E port is connected to the S port. The third valve 41 is disconnected, the fourth valve 111 and the fifth valve 91 are opened, the high-pressure gas side pipe 4 of the three-pipe indoor unit is disconnected, and the refrigerant from the compressor 1 enters the outdoor heat exchanger 5 through the D port and the C port of the first four-way valve 2 for condensation. The first valve 8 is opened, the second valve 14 is disconnected, and the refrigerant passes through the indoor unit. The refrigerant condensed in the external heat exchanger 5 is introduced into the subcooler 6 through the first pipeline 7 for subcooling. The subcooled refrigerant then enters the outdoor heat exchanger 5 through the liquid side pipe 9 for refrigeration. The refrigerant evaporated in the indoor heat exchanger 3 is then introduced into the C port of the second four-way valve 10 through the low-pressure gas side pipe 11. The refrigerant entering the C port of the second four-way valve 10 flows through the D port of the second four-way valve 10, the E port of the first four-way valve 2 and the S port of the first four-way valve 2, and then flows back to the inlet of the compressor 1 through the S port of the first four-way valve 2, thereby achieving refrigeration. In this mode, the energy storage module 13 and the second pipeline 12 will not be used. The specific implementation method is to close the second valve 14. In this mode, the electronic expansion valve of the subcooler 6 needs to be closed.

[0073] In addition, in the heating energy storage mode, the third valve 41 and the fifth valve 91 are both open, and the fourth valve 111 is closed. In the heating defrost mode, the third valve 41 and the fifth valve 91 are also open, and the fourth valve 111 is closed. Therefore, when switching between the heating energy storage mode and the heating defrost mode, the valve on the air conditioner indoor unit side does not need to be adjusted, and no valve adjustment noise caused by mode change will be generated indoors.

[0074] Example 3:

[0075] This embodiment provides a control method, such as Figure 5 As shown, it is used to control the air conditioning system provided in Example 2. The control method includes:

[0076] Get the operating mode of the air conditioning system;

[0077] The first four-way valve 2, the second four-way valve 10, the first valve 8, the second valve 14, the third valve 41, the fourth valve 111, the fifth valve 91 and the electronic expansion valve of the subcooler 6 are opened and closed according to the operating mode of the air-conditioning system.

[0078] Specifically:

[0079] (1) When the operating mode of the air conditioning system is the heating energy storage mode, the control method is as follows:

[0080] The first four-way valve 2 and the second four-way valve 10 are both energized, so that the D port of the first four-way valve 2 is connected to the E port and the C port is connected to the S port, and the D port of the second four-way valve 10 is connected to the E port and the C port is connected to the S port, so that part of the refrigerant flowing out of the compressor 1 flows through the D port and the E port of the first four-way valve 2 and the D port and the E port of the first four-way valve 2 in sequence, and then flows into the second pipeline 12 and performs heat exchange with the energy storage module 13, and the energy storage module 13 absorbs heat to store energy;

[0081] Control the second valve 14 to open so that the refrigerant in the second pipeline 12 flows into the first pipeline 7;

[0082] The third valve 41 is controlled to open, so that another portion of the refrigerant flowing out of the compressor 1 flows into the indoor heat exchanger 3 of the three-pipe indoor unit through the high-pressure gas side pipe 4 to perform heating. The indoor heat exchanger 3 is used to guide this portion of the refrigerant into the liquid side pipe 9;

[0083] Control the fifth valve 91 to open, so that the refrigerant in the liquid side pipe 9 flows into the subcooler 6 and is introduced into the first pipe 7 through the subcooler 6;

[0084] Control the first valve 8 to open, so as to guide the refrigerant in the first pipe 7 to the outdoor heat exchanger 5 for evaporation;

[0085] The evaporated refrigerant is introduced into the first four-way valve 2 through the C port of the first four-way valve 2 by utilizing the outdoor heat exchange gas and flows back to the inlet of the compressor 1 through the S port of the first four-way valve 2 .

[0086] By this method, the air conditioning system can heat and the energy storage module 13 can store energy. In this mode, the electronic expansion valve of the supercooler 6 is controlled to be closed.

[0087] (2) When the operating mode of the air conditioning system is heating and defrosting mode, the control method is as follows:

[0088] The first four-way valve 2 and the second four-way valve 10 are both de-energized, so that port D of the first four-way valve 2 is connected to port C and port E is connected to port S, and port D of the second four-way valve 10 is connected to port C and port E is connected to port S, so that part of the refrigerant flowing out of the compressor 1 flows through port D and port C of the first four-way valve 2 in sequence, and then enters the outdoor heat exchanger 5 to defrost the outdoor heat exchanger 5;

[0089] Control the first valve 8 to open so that the refrigerant in the outdoor heat exchanger 5 flows into the first pipeline 7;

[0090] The third valve 41 is controlled to open, so that another portion of the refrigerant flowing out of the compressor 1 flows into the indoor heat exchanger 3 of the three-pipe indoor unit through the high-pressure gas side pipe 4 to perform heating. The indoor heat exchanger 3 is used to guide this portion of the refrigerant into the liquid side pipe 9;

[0091] Control the fifth valve 91 to open, so that the refrigerant in the liquid side pipe 9 flows into the subcooler 6 and is introduced into the first pipe 7 through the subcooler 6;

[0092] The second valve 14 is controlled to open so that the refrigerant in the first pipeline 7 flows into the second pipeline 12, and the energy storage module 13 releases the stored heat to heat the refrigerant flowing into the second pipeline 12;

[0093] The refrigerant heated in the second pipeline 12 flows into the E port of the second four-way valve 10 and flows back to the inlet of the compressor 1 through the S port of the second four-way valve 10 .

[0094] Through this method, the air conditioning system can supply high-temperature refrigerant to the indoor heat exchanger 3 for heating when defrosting the indoor heat exchanger 3. In this mode, the electronic expansion valve of the above-mentioned subcooler 6 is controlled to be closed.

[0095] (3) When the operating mode of the air conditioning system is heating and defrosting mode, the control method is as follows:

[0096] The first four-way valve 2 and the second four-way valve 10 are both de-energized, so that port D of the first four-way valve 2 is connected to port C and port E is connected to port S, and port D of the second four-way valve 10 is connected to port C and port E is connected to port S. The third valve 41 is controlled to be closed, so that the refrigerant flowing out of the compressor 1 flows through port D and port C of the first four-way valve 2 in sequence, and then enters the outdoor heat exchanger 5 for condensation;

[0097] Control the first valve 8 to open and the second valve 14 to close, so that the refrigerant flowing out of the outdoor heat exchanger 5 flows into the subcooler 6 through the first pipeline 7 for subcooling;

[0098] Control the fifth valve 91 to open so that the refrigerant flowing out of the subcooler 6 flows into the indoor heat exchanger 3 through the liquid side pipe 9 for cooling;

[0099] Control the fourth valve 111 to open so that the refrigerant flowing out of the indoor heat exchanger 3 is introduced into the C port of the second four-way valve 10 through the low-pressure gas side pipe 11;

[0100] The refrigerant entering port C of the second four-way valve 10 flows successively through port D of the second four-way valve 10 , port E of the first four-way valve 2 , and port S of the first four-way valve 2 , and then flows back to the inlet of the compressor 1 through port S of the first four-way valve 2 .

[0101] By this method, the air-conditioning system can perform cooling through the air-conditioning indoor unit in the cooling mode. In this mode, the electronic expansion valve of the supercooler 6 is controlled to open.

[0102] The above description is merely a specific embodiment of the present invention, but the scope of protection of the present invention is not limited thereto. Any modifications or substitutions that can be easily conceived by a person skilled in the art within the technical scope of the present invention should be included within the scope of protection of the present invention. Therefore, the scope of protection of the present invention should be based on the scope of protection of the claims.

Claims

1. An air conditioner outdoor unit, characterized in that: include: compressor; a first four-way valve, wherein a D port and an S port of the first four-way valve are respectively connected to the outlet and the inlet of the compressor, and the outlet of the compressor is connected to the high-pressure gas side pipe of the three-pipe indoor unit; an outdoor heat exchanger connected to port C of the first four-way valve; a subcooler connected to the outdoor heat exchanger via a first pipeline, wherein a first valve is provided on the first pipeline, and the subcooler is connected to the liquid side pipe of the three-pipe indoor unit; a second four-way valve, wherein port D of the second four-way valve is connected to port E of the first four-way valve, port S of the second four-way valve is connected to the inlet of the compressor, port C of the second four-way valve is connected to the low-pressure gas side pipe of the three-pipe indoor unit, port E of the second four-way valve is connected to the first pipe through a second pipe, and the position where the second pipe connects to the first pipe is located between the first valve and the subcooler; The energy storage module is connected to the second pipeline, a second valve is provided on the second pipeline, and the second valve is located between the energy storage module and the first pipeline.

2. An air conditioner outdoor unit according to claim 1, characterized in that: The energy storage module includes a shell and an energy storage body. The shell is provided with an energy storage cavity and a heat exchange flow channel. The energy storage body is installed in the energy storage cavity. The heat exchange flow channel is connected to the second pipeline.

3. An air conditioner outdoor unit according to claim 2, characterized in that: The energy storage body is a phase change material.

4. An air-conditioning outdoor unit according to claim 3, characterized in that: The phase change material is paraffin.

5. The air conditioner outdoor unit according to claim 1, characterized in that: The first valve and / or the second valve is an electronic expansion valve.

6. An air conditioning system, characterized in that: include: A three-pipe indoor unit is connected to a high-pressure gas side pipe, a low-pressure gas side pipe, and a liquid side pipe, wherein the high-pressure gas side pipe, the low-pressure gas side pipe, and the liquid side pipe are respectively provided with a third valve, a fourth valve, and a fifth valve; According to the air-conditioning outdoor unit as described in any one of claims 1 to 5, the high-pressure gas side pipe, the low-pressure gas side pipe and the liquid side pipe of the three-pipe indoor unit are respectively connected to the outlet of the compressor, the C port of the second four-way valve and the subcooler.

7. A control method for an air conditioning system according to claim 6, characterized in that: include: Obtaining an operating mode of the air conditioning system; The first four-way valve, the second four-way valve, the first valve, the second valve, the third valve, the fourth valve, and the fifth valve are opened and closed according to the operating mode of the air-conditioning system.

8. The control method of the air conditioning system according to claim 7, characterized in that: The operating mode of the air conditioning system is a heating and energy storage mode, and the method includes: Controlling the first four-way valve and the second four-way valve to be energized, so that port D of the first four-way valve is connected to port E and port C is connected to port S, and port D of the second four-way valve is connected to port E and port C is connected to port S, so that part of the refrigerant flowing out of the compressor flows through port D and port E of the first four-way valve and port D and port E of the first four-way valve in sequence, and then flows into the second pipeline and performs heat exchange with the energy storage module, and the energy storage module absorbs heat to store energy; controlling the second valve to open so that the refrigerant in the second pipeline flows into the first pipeline; Controlling the third valve to open so that another portion of the refrigerant flowing out of the compressor flows through the high-pressure gas side pipe into the indoor heat exchanger of the three-pipe indoor unit for heating, and using the indoor heat exchanger to introduce this portion of the refrigerant into the liquid side pipe; controlling the fifth valve to open so that the refrigerant in the liquid-side pipe flows into the subcooler and is introduced into the first pipeline through the subcooler; controlling the first valve to open so as to guide the refrigerant in the first pipe into the outdoor heat exchanger for evaporation; The outdoor heat exchanger is used to introduce the evaporated refrigerant into the first four-way valve through the C port of the first four-way valve and then flows back to the inlet of the compressor through the S port of the first four-way valve.

9. The control method of the air conditioning system according to claim 8, characterized in that: The operating mode of the air conditioning system is a heating and defrosting mode, and the method includes: Controlling the first four-way valve and the second four-way valve to be de-energized, so that port D of the first four-way valve is connected to port C and port E is connected to port S, and port D of the second four-way valve is connected to port C and port E is connected to port S, so that part of the refrigerant flowing out of the compressor flows through port D and port C of the first four-way valve in sequence and then enters the outdoor heat exchanger to defrost the outdoor heat exchanger; controlling the first valve to open so that the portion of refrigerant in the outdoor heat exchanger flows into the first pipeline; Controlling the third valve to open so that another portion of the refrigerant flowing out of the compressor flows through the high-pressure gas side pipe into the indoor heat exchanger of the three-pipe indoor unit for heating, and using the indoor heat exchanger to introduce this portion of the refrigerant into the liquid side pipe; controlling the fifth valve to open so that the refrigerant in the liquid-side pipe flows into the subcooler and is introduced into the first pipeline through the subcooler; Controlling the second valve to open so that the refrigerant in the first pipeline flows into the second pipeline, and the energy storage module releases the stored heat to heat the refrigerant flowing into the second pipeline; The refrigerant heated in the second pipeline flows into the E port of the second four-way valve and flows back to the inlet of the compressor through the S port of the second four-way valve.

10. The control method of the air conditioning system according to claim 8, characterized in that: The operating mode of the air-conditioning system is a cooling mode, and the method includes: Controlling the first four-way valve and the second four-way valve to be de-energized, so that port D of the first four-way valve is connected to port C and port E is connected to port S, and port D of the second four-way valve is connected to port C and port E is connected to port S, and controlling the third valve to be closed so that the refrigerant flowing out of the compressor flows through port D and port C of the first four-way valve in sequence and then enters the outdoor heat exchanger for condensation; Controlling the first valve to open and the second valve to close, so that the refrigerant flowing out of the outdoor heat exchanger flows into the subcooler through the first pipeline for subcooling; controlling the fifth valve to open so that the refrigerant flowing out of the subcooler flows into the indoor heat exchanger through the liquid side pipe for cooling; Controlling the fourth valve to open so that the refrigerant flowing out of the indoor heat exchanger is introduced into the C port of the second four-way valve through the low-pressure gas side pipe; The refrigerant entering port C of the second four-way valve flows successively through port D of the second four-way valve, port E of the first four-way valve and port S of the first four-way valve, and then flows back to the inlet of the compressor through port S of the first four-way valve.

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