Cooling and heating type multi-split heat pump and control method and control device of cooling and heating type multi-split heat pump

Abstract

The invention relates to the technical field of heat pumps, and provides a cooling and heating type multi-connected heat pump and a control method and device of the cooling and heating type multi-connected heat pump. The cooling and heating type multi-connected heat pump comprises a plurality of indoor heat exchangers arranged in parallel, and a first check valve communicating with a first collecting pipe is arranged between an outlet of each indoor heat exchanger and the first collecting pipe; a second check valve communicated with the outlets of the indoor heat exchangers is arranged between the second collecting pipe and the outlets of the indoor heat exchangers; and the multiple first electric valves correspond to the multiple indoor heat exchangers one to one, and each first electric valve communicates with an inlet of the corresponding indoor heat exchanger, an exhaust port of the compressor and the third collecting pipe. By adjusting the states of the first electric valve and the throttling valve, effective energy carrying and transferring can be achieved, heat is absorbed from a unit needing refrigeration and directly conveyed to a unit needing heat supply, the requirements for refrigeration and heating can be met at the same time through one-time acting of the compressor, and the energy utilization efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of heat pumps, and in particular to a cooling and heating multi-connected heat pump, and a control method and a control device for the cooling and heating multi-connected heat pump. Background Art

[0002] In industrial or civil facilities, in the same factory or building, there may be rooms that need cooling and rooms that need heating. In related technologies, in order to meet the cooling and heating needs of different areas, different air conditioning systems are installed to control the cooling rooms to release heat to the outside and the heating rooms to absorb heat from the outside. The two systems work independently, and energy is not effectively used, resulting in certain waste. Summary of the invention

[0003] The present invention aims to solve at least one of the technical problems existing in the related art. To this end, the present invention proposes a multi-connected heat pump for cooling and heating, which can achieve effective energy transfer by adjusting the state of the first electric valve and the throttle valve, and directly send the heat absorbed from the unit that needs cooling to the unit that needs heating. The compressor can solve the needs of cooling and heating at the same time by doing work at one time, thereby improving the energy utilization efficiency.

[0004] The invention also provides a control method for a cooling and heating multi-connected heat pump.

[0005] The invention also provides a control device for a cooling and heating multi-connected heat pump.

[0006] The invention also provides an electronic device.

[0007] A cooling and heating multi-connected heat pump according to a first aspect of the present invention includes:

[0008] A plurality of indoor heat exchangers arranged in parallel;

[0009] A first header and a second header are arranged in parallel, a first check valve communicating with the first header is arranged between the outlet of each indoor heat exchanger and the first header, and a second check valve communicating with the outlet of the indoor heat exchanger is arranged between the second header and the outlet of each indoor heat exchanger;

[0010] a heat exchanger, wherein a first heat exchange inlet of the heat exchanger is connected to the first header, and a first heat exchange outlet of the heat exchanger is connected to the second header and a second heat exchange inlet of the heat exchanger;

[0011] a first throttle valve, disposed at the second heat exchange inlet;

[0012] a second throttle valve, disposed between the second header and a first heat exchange outlet of the heat exchanger;

[0013] A compressor, wherein the air intake port of the compressor is connected to the second heat exchange outlet of the heat exchanger;

[0014] a third manifold connected to the air intake port of the compressor;

[0015] A plurality of first electric valves are arranged in one-to-one correspondence with the plurality of indoor heat exchangers, and the first electric valves are used to adjust the connection state between the inlet of the indoor heat exchanger and the exhaust port of the compressor and the third collecting pipe.

[0016] According to one embodiment of the present invention, each of the first electric valves is connected to the inlet of the corresponding indoor heat exchanger, the exhaust port of the compressor and the third manifold, and each of the first electric valves includes a first state, a second state and a third state;

[0017] In the first state, the inlet of the corresponding indoor heat exchanger is connected to the exhaust port of the compressor;

[0018] In the second state, the inlet of the corresponding indoor heat exchanger is connected to the third header;

[0019] In the third state, the exhaust port of the compressor and the third header are not connected to the inlet of the indoor heat exchanger.

[0020] According to one embodiment of the present invention, it also includes:

[0021] An outdoor heat exchanger, wherein the inlet of the outdoor heat exchanger is connected to the first heat exchange outlet of the heat exchanger;

[0022] a third throttle valve, arranged at the inlet of the outdoor heat exchanger;

[0023] A third check valve is disposed between the third throttle valve and the inlet of the outdoor heat exchanger, and the third check valve is connected to the inlet direction of the outdoor heat exchanger;

[0024] a fourth check valve, disposed between the inlet of the outdoor heat exchanger and the first heat exchange inlet of the heat exchanger, the fourth check valve being conductive toward the first heat exchange inlet;

[0025] a second electric valve connected to the outlet of the outdoor heat exchanger, the air intake port of the compressor and the air discharge port of the compressor, wherein the second electric valve includes a condenser state, an evaporator state and a closed state;

[0026] In the condenser state, the outlet of the outdoor heat exchanger is connected to the exhaust port of the compressor;

[0027] In the evaporator state, the outlet of the outdoor heat exchanger is connected to the suction port of the compressor;

[0028] In the closed state, the air intake port of the compressor and the air discharge port of the compressor are both connected to the outlet of the outdoor heat exchanger.

[0029] According to one embodiment of the present invention, it also includes:

[0030] A low pressure sensor is arranged at the air intake port of the compressor;

[0031] The high pressure sensor is arranged at the exhaust port of the compressor.

[0032] According to one embodiment of the present invention, it also includes:

[0033] A first temperature sensor is disposed at one end of the second header close to the first heat exchange outlet;

[0034] The second temperature sensor is arranged at one end of the third manifold close to the air intake port of the compressor.

[0035] A control method for a cooling and heating multi-split heat pump according to a second aspect of the present invention includes:

[0036] Get the working mode of the cooling and heating multi-split heat pump;

[0037] When the working mode is the combined heating and cooling mode, the first electric valve corresponding to the indoor heat exchanger controlling heating is in the first state, and the first electric valve corresponding to the indoor heat exchanger controlling cooling is in the second state, and the first throttle valve and the second throttle valve are controlled to be open.

[0038] According to an embodiment of the present invention, when the working mode is a cooling and heating combined supply mode, it further includes:

[0039] Obtaining the total heating capacity and total cooling capacity of the cooling and heating multi-split heat pump;

[0040] When the total heating capacity is greater than the total cooling capacity, the second electric valve is controlled to be in the evaporator state, and the third throttle valve is controlled to be opened;

[0041] When the total heating capacity is less than the total cooling capacity, the second electric valve is controlled to be in a condenser state;

[0042] When the total heating capacity is equal to the total cooling capacity, the second electric valve is controlled to be in a closed state.

[0043] According to one embodiment of the present invention, the step of obtaining the total heating capacity and the total cooling capacity of the cooling and heating multi-split heat pump further includes:

[0044] The wind speed of the outdoor fan is adjusted according to the difference between the total heating capacity and the total cooling capacity.

[0045] According to one embodiment of the present invention, the step of obtaining the working mode of the cooling and heating multi-split heat pump further includes:

[0046] When the working mode is the heating mode only, the first electric valve corresponding to the indoor heat exchanger for heating is controlled to be in the first state, the second electric valve is controlled to be in the evaporator state, and the third throttle valve is controlled to be open;

[0047] When the working mode is the cooling-only mode, the first electric valve corresponding to the indoor heat exchanger for cooling is controlled to be in the second state, the second electric valve is controlled to be in the condenser state, and the second throttle valve is controlled to be open.

[0048] According to one embodiment of the present invention, when the cooling and heating multi-split heat pump switches from the heating-only mode to the cooling and heating combined mode, the method includes:

[0049] Controlling the second throttle valve to be at an initial opening, and obtaining a first temperature difference between the second temperature and the first temperature;

[0050] controlling the opening of the third throttle valve according to the first temperature difference and a preset condition;

[0051] The preset conditions include:

[0052] The first temperature difference is less than or equal to a first preset temperature.

[0053] According to one embodiment of the present invention, the step of switching the cooling and heating multi-split heat pump from the heating-only mode to the cooling and heating combined mode further includes:

[0054] Obtaining the total heating capacity and total cooling capacity of the cooling and heating multi-split heat pump, and obtaining the exhaust pressure of the compressor and the ambient temperature of the indoor heat exchanger for heating;

[0055] Determining a corresponding saturation temperature according to the exhaust pressure, and calculating a second temperature difference between the saturation temperature and the ambient temperature;

[0056] When the second temperature difference is greater than or equal to the second preset temperature, the second electric valve is controlled to be in a condenser state.

[0057] A control device for a cooling and heating multi-split heat pump according to a third aspect of the present invention includes:

[0058] An acquisition module is used to obtain the working mode of a cooling and heating multi-split heat pump;

[0059] A control module is used to control the first electric valve corresponding to the indoor heat exchanger for heating to be in a first state, and to control the first electric valve corresponding to the indoor heat exchanger for cooling to be in a second state, and to control the first throttle valve and the second throttle valve to open when the working mode is the combined heating and cooling mode.

[0060] An electronic device provided according to an embodiment of the fourth aspect of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps of the control method of the cooling and heating multi-split heat pump provided in the embodiment of the third aspect of the present invention are implemented.

[0061] The above one or more technical solutions in the present invention have at least one of the following technical effects:

[0062] According to the first aspect of the present invention, a cooling and heating multi-connected heat pump is provided, comprising an indoor heat exchanger, a first header, a second header, a first check valve, a second check valve, a heat exchanger, a first throttle valve, a second throttle valve, a compressor, a third header and a first electric valve; the number of indoor heat exchangers is multiple, and the multiple indoor heat exchangers are arranged in parallel; the first header and the second header are arranged in parallel, a first check valve connected to the first header is arranged between the outlet of each indoor heat exchanger and the first header, and a second check valve connected to the outlet of the indoor heat exchanger is arranged between the second header and the outlet of each indoor heat exchanger; the first heat exchange inlet of the heat exchanger is connected to the first header, and the first heat exchange outlet of the heat exchanger is connected to the second header and the second heat exchange inlet of the heat exchanger; The first throttle valve is arranged at the second heat exchange inlet; the second throttle valve is arranged between the second header and the first heat exchange outlet of the heat exchanger; the air intake of the compressor is connected to the second heat exchange outlet of the heat exchanger, and the third header is connected to the air intake of the compressor; a plurality of first electric valves are arranged one by one with a plurality of indoor heat exchangers, and each first electric valve is connected to the inlet of the corresponding indoor heat exchanger, the exhaust port of the compressor and the third header, and each first electric valve includes a first state, a second state and a third state; in the first state, the inlet of the corresponding indoor heat exchanger is connected to the exhaust port of the compressor; in the second state, the inlet of the corresponding indoor heat exchanger is connected to the third header; in the third state, the exhaust port of the compressor and the third header are not connected to the inlet of the indoor heat exchanger. By adjusting the state of the corresponding first electric valve and the throttle valve, effective energy transfer can be achieved, and the heat absorbed from the unit that needs cooling is directly sent to the unit that needs heating. The compressor can solve the needs of both sides at the same time by doing work, thereby improving the energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0063] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or related technologies, the drawings required for use in the embodiments or related technical descriptions are briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0064] Figure 1A schematic structural diagram of a cooling and heating multi-split heat pump provided in an embodiment of the present invention;

[0065] Figure 2 A schematic structural diagram of the state switching of the first electric valve and the second electric valve provided in an embodiment of the present invention;

[0066] Figure 3 A flow chart of a method for controlling a cooling and heating multi-split heat pump provided in an embodiment of the present invention;

[0067] Figure 4 A structural schematic diagram of a control device for a cooling and heating multi-split heat pump provided in an embodiment of the present invention;

[0068] Figure 5 A structural schematic diagram of an electronic device provided by an embodiment of the present invention.

[0069] Reference numerals:

[0070] 10. Indoor heat exchanger; 11. First header; 12. Second header; 13. First check valve; 14. Second check valve; 15. Heat exchanger; 16. First throttle valve; 17. Second throttle valve; 18. Compressor; 19. Third header; 20. First electric valve; 21. Outdoor heat exchanger; 22. Third throttle valve; 23. Third check valve; 24. Fourth check valve; 25. Second electric valve; 26. Low pressure sensor; 27. High pressure sensor; 28. First temperature sensor; 29. ​​Second temperature sensor;

[0071] 301, acquisition module; 302, control module. DETAILED DESCRIPTION

[0072] In order to make the purpose, technical solution and advantages of the invention clearer, the technical solution in the invention will be clearly described below in conjunction with the drawings in the invention. Obviously, the described embodiments are part of the embodiments of the invention, not all of the embodiments. Based on the embodiments in the invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the invention.

[0073] In the description of the embodiments of the present invention, it should be noted that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore cannot be understood as limitations on the embodiments of the present invention. In addition, the terms "first", "second", and "third" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance.

[0074] In the description of the embodiments of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "connected" and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium. For ordinary technicians in this field, the specific meanings of the above terms in the embodiments of the present invention can be understood according to specific circumstances.

[0075] In the embodiments of the present invention, unless otherwise clearly specified and limited, the first feature being "above" or "below" the second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, the first feature being "above", "above" and "above" the second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. The first feature being "below", "below" and "below" the second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature.

[0076] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" etc. means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the embodiment of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine the different embodiments or examples described in this specification and the features of the different embodiments or examples, without contradiction.

[0077] In related technologies, in order to meet the heating and cooling needs of different areas, different air-conditioning systems are installed to control the cooling room to release heat to the outside and the heating room to absorb heat from the outside. The two systems work independently, and energy is not used effectively, resulting in a certain amount of waste.

[0078] According to the first embodiment of the present invention, a multi-connected heat pump for cooling and heating is provided. Figure 1 and Figure 2 , including an indoor heat exchanger 10, a first header 11, a second header 12, a first check valve 13, a second check valve 14, a heat exchanger 15, a first throttle valve 16, a second throttle valve 17, a compressor 18, a third header 19 and a first electric valve 20.

[0079] The cooling and heating multi-split heat pump provided in the embodiment of the present invention includes a plurality of indoor units, each of which is provided with an indoor heat exchanger 10. In order to clearly describe the flow direction of the refrigerant in the refrigerant circulation loop, Figure 1 Only the components related to the refrigerant circulation circuit are shown. For example, each indoor unit is also equipped with an indoor fan, a filter, and an air guide plate installed at the air outlet of the indoor unit. These components have little effect on understanding the working principle of the cooling and heating multi-split heat pump, so they are not shown in the attached figure. Figure 1 The other related components are shown in the specification or described separately in the specification, and the other related components may be similar or the same as those in the related art.

[0080] See also Figure 1 A plurality of indoor heat exchangers 10 are arranged in parallel, and different indoor heat exchangers 10 are arranged in different rooms or working areas. For example, the first indoor heat exchanger 10 is arranged in a room that needs heating, the second indoor heat exchanger 10 is arranged in the living room, and the third indoor heat exchanger 10 is arranged in a room that needs cooling. Figure 1 Three indoor heat exchangers 10 are shown, operating in heating mode, shutdown mode and cooling mode respectively. The number of indoor heat exchangers 10 in each operating state can be increased as needed.

[0081] The indoor heat exchanger 10 has an inlet and an outlet, and refrigerant may flow in or out of the inlet and the outlet. The purpose of defining the inlet and the outlet in the embodiment of the present invention is to explain their existence, position and connection relationship. In this embodiment, the positions of the inlet and the outlet are determined according to the flow direction of the refrigerant when the indoor heat exchanger 10 is heating.

[0082] The first collecting pipe 11 and the second collecting pipe 12 are arranged in parallel, and the outlet of each indoor heat exchanger 10 is provided with two branches, one of which is connected to the first collecting pipe 11, and the other is connected to the second collecting pipe 12. A first check valve 13 connected to the first collecting pipe 11 is provided between the outlet of each indoor heat exchanger 10 and the first collecting pipe 11, and a second check valve 14 connected to the outlet of the indoor heat exchanger 10 is provided between the second collecting pipe 12 and the outlet of each indoor heat exchanger 10.

[0083] The heat exchanger 15 may be a flat plate heat exchanger, and the heat exchanger 15 has a first heat exchange inlet, a first heat exchange outlet, a second heat exchange inlet, and a second heat exchange outlet, wherein the first heat exchange inlet is connected to the first heat exchange outlet, and the second heat exchange inlet is connected to the second heat exchange outlet, forming two parallel heat exchange pipelines, thereby realizing heat exchange. The two heat exchange pipelines are arranged in a circuitous and staggered manner, which increases the heat exchange length.

[0084] See also Figure 1 The first heat exchange inlet of the heat exchanger 15 is connected to the first header 11, and the first heat exchange outlet is connected to the second header 12 and the second heat exchange inlet.

[0085] The first throttle valve 16 is arranged at the second heat exchange inlet, the second throttle valve 17 is arranged between the second header 12 and the first heat exchange outlet of the heat exchanger, the intake port of the compressor 18 is connected to the second heat exchange outlet of the heat exchanger 15, and the third header 19 is connected to the intake port of the compressor 18.

[0086] The cooling and heating multi-split heat pump provided in the embodiment of the present invention includes a plurality of first electric valves 20, see Figure 2 The first electric valve 20 includes a shell, a valve core and a drive assembly. Two parallel chambers are formed in the shell, such as a first chamber and a second chamber. A slideway connected to the first chamber and the second chamber is also provided in the shell. The valve core is slidably connected to the slideway. The drive assembly is connected to the valve core through electromagnetic force or a worm gear structure. Avoidance grooves are formed on the side where the first chamber and the second chamber are away from each other, and the left and right avoidance grooves are located on the same axis as the slideway.

[0087] The shell also has a first inlet and a first outlet connected to the first chamber, and a second inlet and a second outlet connected to the second chamber; when the valve core moves to the avoidance groove on the left, the second inlet is connected to the second outlet; when the valve core moves to the avoidance groove on the right, the first inlet is connected to the first outlet; when the valve core is located in the middle of the slide, the first inlet is not connected to the first outlet, and the second inlet is not connected to the second outlet.

[0088] Among them, when the valve core moves to the avoidance groove on the right, it corresponds to the first state of the first electric valve 20; when the valve core moves to the avoidance groove on the left, it corresponds to the second state of the first electric valve 20; when the valve core is located in the middle of the slide, it corresponds to the third state of the first electric valve 20.

[0089] Multiple first electric valves 20 are arranged in one-to-one correspondence with multiple indoor heat exchangers 10, and each first electric valve 20 is connected to the inlet of the corresponding indoor heat exchanger 10, the exhaust port of the compressor 18 and the third collecting pipe 19, that is, the first inlet is connected to the exhaust port of the compressor, the first outlet and the second inlet are connected to the inlet of the indoor heat exchanger 10, and the second outlet is connected to the third collecting pipe 19.

[0090] It should be noted that the first electric valve 20 may also be other types of three-way valves or four-way valves, which can be simultaneously connected to the inlet of the indoor heat exchanger 10, the exhaust port of the compressor 18 and the third manifold 19, and switch their connection states.

[0091] In the first state, the inlet of the corresponding indoor heat exchanger 10 is connected to the exhaust port of the compressor 18 .

[0092] In the second state, the inlet of the corresponding indoor heat exchanger 10 is connected to the third header 19;

[0093] In the third state, the exhaust port of the compressor 18 and the third header 19 are not connected to the inlet of the indoor heat exchanger 10 .

[0094] When the cooling and heating multi-split heat pump provided in the embodiment of the present invention operates in the cooling and heating combined supply mode, for example Figure 1 In the case where the first indoor heat exchanger 10 is heating, the second indoor heat exchanger 10 is shut down, and the third indoor heat exchanger 10 is cooling, the first electric valve 20 corresponding to the indoor heat exchanger 10 for heating is controlled to be in the first state, the first electric valve 20 corresponding to the indoor heat exchanger 10 for cooling is controlled to be in the second state, the first electric valve 20 of the indoor heat exchanger 10 that is not in operation is controlled to be in the third state, and the first throttle valve 16 and the second throttle valve 17 are controlled to be opened.

[0095] The flow process of refrigerant is as follows:

[0096] See also Figure 1, the compressor 18 presses the high-temperature and high-pressure refrigerant into the indoor heat exchanger 10 along the first electric valve 20 on the left, and the corresponding area can be heated under the action of the indoor fan. The refrigerant after heat exchange flows into the first header 11 and the first heat exchange inlet of the heat exchanger 15 along the first check valve 13. The heat exchanger is an enthalpy-increasing heat exchanger. The liquid refrigerant flows out of the heat exchanger 15 and is divided into two paths. The auxiliary path is throttled and depressurized by the first throttle valve 16 and returns to the heat exchanger 15 to absorb heat and vaporize, and then returns to the air intake of the compressor 18. The supercooled refrigerant in the main path is throttled and depressurized by the second throttle valve 17 and then enters the refrigerated indoor heat exchanger 10 through the second check valve 14 on the right. Among them, by controlling the opening and ratio of the first throttle valve 16 and the second throttle valve 17, the ratio of the refrigerant flowing through the first throttle valve 16 and the second throttle valve 17 can be controlled, thereby achieving precise refrigeration.

[0097] According to the above content, it can be known that when the compressor 18 of the cooling and heating multi-split heat pump provided in the embodiment of the present invention is working, by adjusting the state of the first electric valve 20 and the throttle valve, effective energy transfer can be achieved, and the heat absorbed from the unit that needs cooling is directly sent to the unit that needs heating. The compressor 18 can meet the needs of both sides at one time, thereby improving the energy utilization efficiency. When the compressor is working, it only needs to meet the maximum heating capacity demand or the maximum cooling capacity demand, and the corresponding cooling capacity demand or heating capacity demand is transported and transferred through the refrigerant circulation loop. The total power consumption of the cooling and heating multi-split heat pump is reduced from the sum of the total heating power consumption and the total cooling power consumption to the total heating power consumption or the total cooling power consumption, and the energy-saving effect is more obvious.

[0098] In some embodiments, the cooling and heating multi-split heat pump provided by the embodiments of the present invention further includes an outdoor heat exchanger 21 , a third throttle valve 22 , a third check valve 23 , a fourth check valve 24 and a second electric valve 25 .

[0099] See also Figure 1 The inlet of the outdoor heat exchanger 21 is connected to the first heat exchange outlet of the heat exchanger 15, the third throttle valve 22 is arranged at the inlet of the outdoor heat exchanger 21, the third check valve 23 is arranged between the third throttle valve 22 and the inlet of the outdoor heat exchanger 21, and the third check valve 23 is conducted toward the inlet direction of the outdoor heat exchanger 21; the fourth check valve 24 is arranged between the inlet of the outdoor heat exchanger 21 and the first heat exchange inlet of the heat exchanger 15, and the fourth check valve 24 is conducted toward the first heat exchange inlet direction.

[0100] The second electric valve 25 has the same or similar structure as the first electric valve 20. In the embodiment of the present invention, a four-way valve of the same model is used for ease of control. The second electric valve 25 is connected to the outlet of the outdoor heat exchanger 21, the air intake of the compressor 18, and the exhaust port of the compressor 18. The second electric valve 25 includes a condenser state, an evaporator state, and a closed state; wherein the condenser state, the evaporator state, and the closed state correspond to the second state, the first state, and the third state of the first electric valve 20, respectively. Since the functions of the electric valves at different positions are different, in order to avoid confusion, each has its own name.

[0101] In the condenser state, the outlet of the outdoor heat exchanger 21 is connected to the exhaust port of the compressor 18;

[0102] In the evaporator state, the outlet of the outdoor heat exchanger 21 is connected to the suction port of the compressor 18;

[0103] In the closed state, the air intake port of the compressor 18 and the air discharge port of the compressor 18 are not connected to the outlet of the outdoor heat exchanger 21 .

[0104] According to the above, the cooling and heating multi-split heat pump provided in the embodiment of the present invention adds an outdoor heat exchanger 21 and supporting pipelines. The outdoor heat exchanger 21 is not only connected to the air intake port of the compressor, but also connected to the air exhaust port of the compressor. By switching the state of the second electric valve 25, the outdoor heat exchanger 21 can play the role of a condenser or an evaporator.

[0105] When the cooling and heating multi-split heat pump provided in the embodiment of the present invention operates in the cooling and heating combined supply mode, the heating supply may be greater than the cooling supply, or the heating supply may be less than the cooling supply. At this time, it is necessary to supplement some heat or cooling from the outside.

[0106] When the working mode is the combined cooling and heating mode, it also includes:

[0107] Obtain the total heating and cooling capacity of the multi-split heat pump;

[0108] When the total heating capacity is greater than the total cooling capacity, the second electric valve is controlled to be in the evaporator state, and the third throttle valve is controlled to be opened;

[0109] When the total heating capacity is less than the total cooling capacity, the second electric valve is controlled to be in the condenser state;

[0110] When the total heating capacity is equal to the total cooling capacity, the second electric valve is controlled to be in a closed state.

[0111] The specific working principle is as follows:

[0112] When the total heating capacity is greater than the total cooling capacity, the system needs to absorb heat from the outside. At this time, the outdoor heat exchanger 21 is in the evaporator mode, the second electric valve 25 is in the evaporator state, the third throttle valve 22 is open, and the supercooled refrigerant liquid flowing out of the heat exchanger 15 is divided into two paths. One path is throttled and depressurized through the second throttle valve 17 to enter the indoor heat exchanger 10 for cooling, and the other path is throttled and depressurized through the third throttle valve 22 to enter the outdoor heat exchanger 21 to absorb heat, and finally returns to the suction port of the compressor 18 through the second electric valve 25. On the contrary, when the total heating capacity is less than the total cooling capacity, the system needs to release heat to the air. At this time, the outdoor heat exchanger 21 is in the condenser mode, the second electric valve 25 is in the condenser state, and the exhaust gas of the compressor 18 enters the indoor heat exchanger 10 that needs heating, and the other path enters the outdoor heat exchanger 21 through the second electric valve 25. After the refrigerant dissipates heat and condenses, it enters the heat exchanger 15 through the fourth check valve 24, and then enters the indoor heat exchanger 10 for cooling.

[0113] In this embodiment, not only can the combined supply of cooling and heating be realized, but also the combined supply of different amounts of cooling and heating can be realized, and the scope of application is wider.

[0114] In some embodiments, the cooling and heating type multi-split heat pump also includes a low-pressure sensor 26 and a high-pressure sensor 27. The low-pressure sensor 26 is arranged at the air intake port of the compressor 18, and the high-pressure sensor 27 is arranged at the air exhaust port of the compressor 18. The cooling and heating type multi-split heat pump can control the operation of the compressor or the throttle valve according to the pressure of the air intake port and the pressure of the air exhaust port.

[0115] In some embodiments, the cooling and heating multi-split heat pump further includes a first temperature sensor 28 and a second temperature sensor 29, wherein the first temperature sensor 28 is disposed at one end of the second header 12 close to the first heat exchange outlet, and the second temperature sensor 29 is disposed at one end of the third header 19 close to the air intake port of the compressor 18. The cooling and heating multi-split heat pump can assist in controlling the opening of the throttle valve, the states of the first electric valve 20 and the second electric valve 25, or the frequency of the compressor, etc., according to the first temperature detected by the first temperature sensor 28 and the second temperature detected by the second temperature sensor 29.

[0116] According to the control method of the cooling and heating multi-split heat pump provided by the second embodiment of the present invention, please refer to Figure 3 ,include:

[0117] S200: Obtain the working mode of the cooling and heating multi-split heat pump.

[0118] S210. When the working mode is the combined heating and cooling mode, the first electric valve corresponding to the indoor heat exchanger for controlling heating is in the first state, and the first electric valve corresponding to the indoor heat exchanger for controlling cooling is in the second state, and the first throttle valve and the second throttle valve are controlled to be opened.

[0119] In step S210, the compressor 18 presses the high-temperature and high-pressure refrigerant into the indoor heat exchanger 10 along the first electric valve 20 on the left, and the corresponding area can be heated under the action of the indoor fan. The refrigerant after heat exchange flows into the first header 11 and the first heat exchange inlet of the heat exchanger 15 along the first check valve 13. The plate heat exchanger is an enthalpy-increasing heat exchanger. The liquid refrigerant is divided into two paths after flowing out of the plate heat exchanger. The auxiliary path is throttled and depressurized by the first throttle valve 16 and returns to the heat exchanger 15 to absorb heat and vaporize, and then returns to the air intake of the compressor 18. The supercooled refrigerant in the main path is throttled and depressurized by the second throttle valve 17 and then enters the refrigerated indoor heat exchanger 10 through the second check valve 14 on the right. Among them, by controlling the opening and ratio of the first throttle valve 16 and the second throttle valve 17, the ratio of the refrigerant flowing through the first throttle valve 16 and the second throttle valve 17 can be controlled, thereby achieving precise refrigeration.

[0120] By adjusting the state of the first electric valve 20 and the throttle valve, effective energy transfer can be achieved, and the heat absorbed from the unit that needs cooling is directly sent to the unit that needs heating. The compressor 18 can meet the needs of both sides at one time, thereby improving the efficiency of energy utilization. When the compressor is working, it only needs to meet the maximum heating capacity demand or the maximum cooling capacity demand, and the corresponding cooling capacity demand is transferred through the refrigerant circulation loop. The total power consumption of the cold and warm multi-split heat pump is reduced from the sum of the total heating power consumption and the total cooling power consumption to the total heating power consumption or the total cooling power consumption, and the energy-saving effect is more obvious.

[0121] In some embodiments, when the working mode is the cooling and heating combined supply mode, it also includes:

[0122] Obtain the total heating and cooling capacity of the multi-split heat pump.

[0123] When the total heating capacity is greater than the total cooling capacity, the second electric valve is controlled to be in the evaporator state, and the third throttle valve is controlled to be opened;

[0124] When the total heating capacity is less than the total cooling capacity, the second electric valve is controlled to be in the condenser state;

[0125] When the total heating capacity is equal to the total cooling capacity, the second electric valve is controlled to be in a closed state.

[0126] It is understandable that when the working mode is the combined heating and cooling mode, there is still a situation where the heating supply and the cooling supply are different; when the total heating supply is greater than the total cooling supply, the system also needs to absorb heat from the outside. At this time, the outdoor heat exchanger 21 is in evaporator mode, the second electric valve 25 is in the evaporator state, and the third throttle valve 22 is opened. The supercooled refrigerant liquid flowing out of the heat exchanger 15 is divided into two paths, one is throttled and reduced in pressure through the second throttle valve 17 to enter the refrigerated indoor heat exchanger 10, and the other is throttled and reduced in pressure through the third throttle valve 22 to enter the outdoor heat exchanger 21 to absorb heat, and finally returns to the suction port of the compressor 18 through the second electric valve 25. On the contrary, when the total heating capacity is less than the total cooling capacity, the system needs to release heat to the air. At this time, the outdoor heat exchanger 21 is in condenser mode, and the second electric valve 25 is in condenser state. In addition to entering the indoor heat exchanger 10 that needs heating, the exhaust gas of the compressor 18 also enters the outdoor heat exchanger 21 through the second electric valve 25. After the refrigerant dissipates heat and condenses, it enters the heat exchanger 15 through the fourth check valve 24, and then enters the indoor heat exchanger 10 for cooling.

[0127] In this embodiment, not only can the combined supply of cooling and heating be realized, but also the combined supply of different amounts of cooling and heating can be realized, and the scope of application is wider.

[0128] In some embodiments, the step of obtaining the total heating capacity and the total cooling capacity of the cooling and heating multi-split heat pump further includes:

[0129] Adjust the wind speed of the outdoor fan according to the difference between the total heating capacity and the total cooling capacity.

[0130] It is understandable that as the outdoor fan speed increases, the heat exchange rate between the outdoor heat exchanger and the outdoor air increases, which can provide more cooling or heat to the system per unit time to make up for the difference between the total heating and cooling capacity. Therefore, when the difference between the total heating and cooling capacity is determined, the outdoor fan speed that needs to be provided can be inferred in reverse.

[0131] According to one embodiment of the present invention, the step of obtaining the working mode of the cooling and heating multi-split heat pump further includes:

[0132] When the working mode is the heating mode only, the first electric valve corresponding to the indoor heat exchanger for heating is controlled to be in the first state, the second electric valve is controlled to be in the evaporator state, and the third throttle valve is controlled to be open.

[0133] It is understandable that the cooling and heating multi-split heat pump can operate in a single heating mode, that is, all or part of the indoor heat exchangers 10 are heating. At this time, the second electric valve is controlled to be in the evaporator state, and the outdoor heat exchanger is switched to the evaporator mode to absorb heat from the outdoor air.

[0134] When the working mode is the cooling-only mode, the first electric valve corresponding to the indoor heat exchanger for cooling is controlled to be in the second state, the second electric valve is controlled to be in the condenser state, and the second throttle valve is controlled to be open.

[0135] It is understandable that the cooling and heating multi-split heat pump can operate in a cooling mode only, that is, all or part of the indoor heat exchangers 10 are cooling. At this time, the second electric valve 25 is controlled to be in a condenser state, and the outdoor heat exchanger 21 is switched to a condenser mode to dissipate heat to the outdoor air.

[0136] In some embodiments, the cooling and heating multi-split heat pump may first operate in a single heating mode, and during the operation, a cooling demand is generated, and it is necessary to switch from the single heating mode to the cooling and heating combined supply mode. The control method of the cooling and heating multi-split heat pump includes:

[0137] Controlling the second throttle valve to be at an initial opening, and obtaining a first temperature difference between the second temperature and the first temperature;

[0138] The opening degree of the third throttle valve is controlled according to the first temperature difference and a preset condition.

[0139] The preset conditions include: the first temperature difference is less than or equal to the first preset temperature.

[0140] It is understandable that when the cooling and heating multi-split heat pump switches from the single heating mode to the cooling and heating combined supply mode, the second throttle valve is opened and the first electric valve 20 corresponding to the indoor heat exchanger that needs to be cooled is controlled to be in the second state. At this time, the cooling and heating multi-split heat pump smoothly switches to the cooling and heating combined supply mode. However, the state of the refrigerant after the mode switching may not meet the cooling or heating needs. When the first temperature difference is less than or equal to the first preset temperature, for example, when the first temperature difference is less than or equal to 2 degrees Celsius, the opening of the third throttle valve is reduced by 5 steps every 1 minute to allow more refrigerant to flow into the indoor unit until the set conditions are achieved.

[0141] In some embodiments, the step of switching the cooling and heating multi-split heat pump from the heating-only mode to the cooling and heating combined mode further includes:

[0142] The total heating capacity and the total cooling capacity of the cooling and heating multi-split heat pump are obtained, and the exhaust pressure of the compressor and the ambient temperature of the indoor heat exchanger for heating are obtained.

[0143] The corresponding saturation temperature is determined according to the exhaust pressure, and a second temperature difference between the saturation temperature and the ambient temperature is calculated.

[0144] When the second temperature difference is greater than or equal to the second preset temperature, the second electric valve is controlled to be in the condenser state.

[0145] It is understandable that when the demand for cooling is greater than that for heating, the area of ​​the heat exchanger used for heat dissipation is too small for the system, which will cause the exhaust pressure to increase. When the saturation temperature corresponding to the set exhaust pressure is greater than the ambient temperature or water temperature of the indoor heat exchanger for heating and the temperature difference is greater than 7°C, the second electric valve switches to the condenser mode. At this time, the third check valve 23 is locked and the third throttle valve 22 loses its function.

[0146] When the heating capacity is greater than the cooling capacity, the system needs to absorb additional heat through the outdoor heat exchanger 21. At this time, since the outdoor heat exchanger 21 is in condenser mode, it is still releasing heat to the outside, while the load of the indoor heat exchanger 10, which is an evaporator and is cooling, is relatively small. For the system, this is equivalent to insufficient evaporator area, which will cause the suction pressure to be too low. When the difference between the saturation temperature and the evaporation temperature corresponding to the set suction pressure is greater than 10°C, the second electric valve is triggered to switch back to the evaporator state.

[0147] In heating priority mode, the default system heating capacity is greater than the cooling capacity, the outdoor heat exchanger is normally in evaporator mode, and the frequency conversion control of the compressor and outdoor fan is constrained by the heating capacity.

[0148] Under cooling priority conditions, when the first indoor heat exchanger starts the cooling mode, the second electric valve starts the condenser mode in an interlocked manner. At this time, the second throttle valve opens and sets an initial opening according to the number of indoor heat exchangers being cooled. When the cooling and heating modes of the subsequently opened indoor heat exchangers are the same, the system will maintain the existing mode of operation, which is the conventional cooling mode.

[0149] When one or more heat units start the heating mode, the corresponding electric valve is activated. When the heating supply is less than the cooling supply, the outdoor heat exchanger is always maintained in the condenser mode. When the heating supply is greater than the cooling supply, the evaporation pressure will decrease with the same logic as above, triggering the outdoor heat exchanger to switch to the evaporator mode.

[0150] Under cooling priority conditions, the default system cooling capacity is greater than the heating capacity, the outdoor heat exchanger is normally in condenser mode, and the frequency conversion control of the compressor and the outdoor heat exchanger fan is constrained by the cooling capacity.

[0151] The control logic of the enthalpy increase system of the first throttle valve 16 is the same as that of the conventional air energy heat pump system, and the frequency conversion control logic of the compressor 18 and the fan is the same as that of the conventional air energy heat pump system, and the present invention will not explain it in detail.

[0152] According to the third aspect of the present invention, the control device of the cooling and heating multi-split heat pump is provided. Figure 4 ,include:

[0153] The acquisition module 301 is used to acquire the working mode of the cooling and heating multi-split heat pump.

[0154] The control module 302 is used to control the first electric valve corresponding to the indoor heat exchanger for heating to be in a first state, and to control the first electric valve corresponding to the indoor heat exchanger for cooling to be in a second state, and to control the first throttle valve and the second throttle valve to be opened when the working mode is the combined heating and cooling mode.

[0155] It should be noted that the above steps S200 to S210, as well as other steps, are only for the convenience of expression, and do not constitute a time sequence limitation for each step in the control method of the cooling and heating multi-split heat pump. In addition, some contents are described in detail in the control method of the cooling and heating multi-split heat pump provided in the first aspect embodiment, and the contents in all the control methods of the cooling and heating multi-split heat pumps are also applicable to the control device of the cooling and heating multi-split heat pump provided in the third aspect embodiment, and in order to avoid repetition, the control device of the cooling and heating multi-split heat pump provided in the third aspect embodiment is not described in detail. Similarly, the contents in the above two aspects of the embodiments can be used to explain the contents of all the subsequent aspects of the embodiments, so the repeated contents will not be repeated in the subsequent embodiments. The control device of the cooling and heating multi-split heat pump provided in accordance with the embodiment of the present invention has a technical effect corresponding to the technical effect of the above-mentioned control method of the cooling and heating multi-split heat pump, which will not be repeated here.

[0156] An electronic device provided according to an embodiment of the fourth aspect of the present invention includes a memory, a processor, and a computer program stored in the memory and executable on the processor. When the processor executes the program, the steps of the control method of the cooling and heating multi-split heat pump provided in the embodiment of the third aspect of the present invention are implemented.

[0157] Figure 5 An example of a physical structure diagram of an electronic device is provided, and the electronic device may include: a processor 810, a communication interface 820, a memory 830, and a communication bus 840, wherein the processor 810, the communication interface 820, and the memory 830 communicate with each other through the communication bus 840. The processor 810 may call the logic instructions in the memory 830 to execute a control method for a heating-type multi-split heat pump, and the method includes: obtaining the working mode of the cooling-heating multi-split heat pump; when the working mode is the cooling-heating combined supply mode, controlling the first electric valve corresponding to the indoor heat exchanger for heating to be in a first state, and controlling the first electric valve corresponding to the indoor heat exchanger for cooling to be in a second state, and controlling the first throttle valve and the second throttle valve to be opened.

[0158] In addition, the logic instructions in the above-mentioned memory 830 can be implemented in the form of a software functional unit and can be stored in a computer-readable storage medium when it is sold or used as an independent product. Based on such an understanding, the technical solution of the present invention, in essence, or the part that contributes to the prior art or the part of the technical solution, can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0159] The device embodiments described above are merely illustrative, wherein the units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or they may be distributed on multiple network units. Some or all of the modules may be selected according to actual needs to achieve the purpose of the scheme of this embodiment. Ordinary technicians in this field can understand and implement it without paying creative labor.

[0160] Through the description of the above implementation methods, those skilled in the art can clearly understand that each implementation method can be implemented by means of software plus a necessary general hardware platform, and of course, it can also be implemented by hardware. Based on this understanding, the above technical solution is essentially or the part that contributes to the prior art can be embodied in the form of a software product, and the computer software product can be stored in a computer-readable storage medium, such as ROM / RAM, a disk, an optical disk, etc., including a number of instructions for a computer device (which can be a personal computer, a server, or a network device, etc.) to execute the methods described in each embodiment or some parts of the embodiments.

[0161] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A multi-connected heat pump for cooling and heating, characterized in that: include: A plurality of indoor heat exchangers arranged in parallel; A first header and a second header are arranged in parallel, a first check valve is arranged between the outlet of each indoor heat exchanger and the first header, and a second check valve is arranged between the second header and the outlet of each indoor heat exchanger; a heat exchanger, wherein a first heat exchange inlet of the heat exchanger is connected to the first header, and a first heat exchange outlet of the heat exchanger is connected to the second header and a second heat exchange inlet of the heat exchanger; a first throttle valve, disposed at the second heat exchange inlet; a second throttle valve, disposed between the second header and a first heat exchange outlet of the heat exchanger; A compressor, wherein the air intake port of the compressor is connected to the second heat exchange outlet of the heat exchanger; a third manifold connected to the air intake port of the compressor; A plurality of first electric valves are arranged in one-to-one correspondence with the plurality of indoor heat exchangers, and the first electric valves are used to adjust the connection state between the inlet of the indoor heat exchanger and the exhaust port of the compressor and the third collecting pipe.

2. The cooling and heating multi-connected heat pump according to claim 1, characterized in that: Each of the first electric valves is connected to the inlet of the corresponding indoor heat exchanger, the exhaust port of the compressor and the third header, and each of the first electric valves includes a first state, a second state and a third state; In the first state, the inlet of the corresponding indoor heat exchanger is connected to the exhaust port of the compressor; In the second state, the inlet of the corresponding indoor heat exchanger is connected to the third header; In the third state, the exhaust port of the compressor and the third header are not connected to the inlet of the indoor heat exchanger.

3. The cooling and heating multi-connected heat pump according to claim 2, characterized in that: Also includes: An outdoor heat exchanger, wherein the inlet of the outdoor heat exchanger is connected to the first heat exchange outlet of the heat exchanger; a third throttle valve, arranged at the inlet of the outdoor heat exchanger; A third check valve is disposed between the third throttle valve and the inlet of the outdoor heat exchanger, and the third check valve is connected to the inlet direction of the outdoor heat exchanger; a fourth check valve, disposed between the inlet of the outdoor heat exchanger and the first heat exchange inlet of the heat exchanger, the fourth check valve being conductive toward the first heat exchange inlet; a second electric valve connected to the outlet of the outdoor heat exchanger, the air intake port of the compressor and the air discharge port of the compressor, wherein the second electric valve includes a condenser state, an evaporator state and a closed state; In the condenser state, the outlet of the outdoor heat exchanger is connected to the exhaust port of the compressor; In the evaporator state, the outlet of the outdoor heat exchanger is connected to the suction port of the compressor; In the closed state, the air intake port of the compressor and the air discharge port of the compressor are both connected to the outlet of the outdoor heat exchanger.

4. The cooling and heating multi-split heat pump according to claim 3, characterized in that: Also includes: A low pressure sensor is arranged at the air intake port of the compressor; The high pressure sensor is arranged at the exhaust port of the compressor.

5. The cooling and heating multi-connected heat pump according to claim 3, characterized in that: Also includes: A first temperature sensor is disposed at one end of the second header close to the first heat exchange outlet; The second temperature sensor is arranged at one end of the third manifold close to the air intake port of the compressor.

6. A control method for a cooling and heating multi-split heat pump according to any one of claims 2 to 5, characterized in that: include: Get the working mode of the cooling and heating multi-split heat pump; When the working mode is the combined heating and cooling mode, the first electric valve corresponding to the indoor heat exchanger controlling heating is in the first state, and the first electric valve corresponding to the indoor heat exchanger controlling cooling is in the second state, and the first throttle valve and the second throttle valve are controlled to be open.

7. The control method of the cooling and heating multi-split heat pump according to claim 6, characterized in that: When the working mode is the cooling and heating combined supply mode, it also includes: Obtaining the total heating capacity and total cooling capacity of the cooling and heating multi-split heat pump; When the total heating capacity is greater than the total cooling capacity, the second electric valve is controlled to be in the evaporator state, and the third throttle valve is controlled to be opened; When the total heating capacity is less than the total cooling capacity, the second electric valve is controlled to be in a condenser state; When the total heating capacity is equal to the total cooling capacity, the second electric valve is controlled to be in a closed state.

8. The control method of the cooling and heating multi-split heat pump according to claim 7, characterized in that: The step of obtaining the total heating capacity and the total cooling capacity of the cooling and heating multi-split heat pump further includes: The wind speed of the outdoor fan is adjusted according to the difference between the total heating capacity and the total cooling capacity.

9. The control method of the cooling and heating multi-split heat pump according to claim 6, characterized in that: The steps of obtaining the working mode of the cooling and heating multi-split heat pump also include: When the working mode is the heating mode only, the first electric valve corresponding to the indoor heat exchanger for heating is controlled to be in the first state, the second electric valve is controlled to be in the evaporator state, and the third throttle valve is controlled to be open; When the working mode is the cooling-only mode, the first electric valve corresponding to the indoor heat exchanger for cooling is controlled to be in the second state, the second electric valve is controlled to be in the condenser state, and the second throttle valve is controlled to be open.

10. The control method of the cooling and heating multi-split heat pump according to claim 9, characterized in that: When the cooling and heating multi-split heat pump switches from the heating-only mode to the cooling and heating combined mode, the method includes: Controlling the second throttle valve to be at an initial opening, and obtaining a first temperature difference between the second temperature and the first temperature; controlling the opening of the third throttle valve according to the first temperature difference and a preset condition; The preset conditions include: The first temperature difference is less than or equal to a first preset temperature.

11. The control method of the cooling and heating multi-split heat pump according to claim 10, characterized in that: The step of switching the cooling and heating multi-split heat pump from the heating-only mode to the cooling and heating combined mode further includes: Obtaining the total heating capacity and total cooling capacity of the cooling and heating multi-split heat pump, and obtaining the exhaust pressure of the compressor and the ambient temperature of the indoor heat exchanger for heating; Determining a corresponding saturation temperature according to the exhaust pressure, and calculating a second temperature difference between the saturation temperature and the ambient temperature; When the second temperature difference is greater than or equal to the second preset temperature, the second electric valve is controlled to be in a condenser state.

12. A control device for a cooling and heating multi-split heat pump, characterized in that: include: An acquisition module is used to obtain the working mode of a cooling and heating multi-split heat pump; A control module is used to control the first electric valve corresponding to the indoor heat exchanger for heating to be in a first state, and to control the first electric valve corresponding to the indoor heat exchanger for cooling to be in a second state, and to control the first throttle valve and the second throttle valve to open when the working mode is the combined heating and cooling mode.

13. An electronic device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that: When the processor executes the program, the steps of the control method of the cooling and heating multi-split heat pump as described in any one of claims 6 to 11 are implemented.

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