A multi-connected air conditioner system and its control method

Abstract

The present invention discloses a multi-connected air conditioner system and its control method. The system includes: an outdoor throttling element is provided on the pipeline where the outdoor heat exchanger is located, and an indoor throttling element is provided on the pipeline where the indoor unit is located; the exhaust port of the compressor is communicated with the first valve port of the first four-way valve and the fifth valve port of the second four-way valve; the second valve port of the first four-way valve, the sixth valve port of the second four-way valve, and the eighth valve port of the second four-way valve are all communicated with the suction port of the compressor; the third valve port of the first four-way valve is communicated with the refrigerant heat exchange pipeline; the fourth valve port of the first four-way valve is communicated with the indoor unit and the suction port of the compressor after passing through the outdoor heat exchanger and the outdoor throttling element; the seventh valve port of the second four-way valve is communicated with the indoor unit; the refrigerant heat exchange pipeline is communicated with the indoor unit after passing through the floor heating throttling element. In this solution, the energy of the water system is absorbed during the defrosting process for defrosting use, improving the user experience.

Description

Technical Field

[0001] The present invention belongs to the technical field of multi-connected unit systems, and particularly relates to a multi-connected unit system and a control method thereof, and more particularly to a multi-connected unit 3D heating system capable of continuously heating during the defrosting process of an outdoor heat exchanger and a control method thereof. Background Art

[0002] Floor heating is one of the heating methods that is more in line with the physiological needs of human body heating. The indoor temperature distribution is uniform, and the room temperature gradually decreases from bottom to top. Due to the dual effects of ground radiation and temperature, a thermal internal environment that truly meets the needs of the human body is formed. Low-temperature hot water heating evenly lays the floor heating coils in the cushion layer under the ground. The indoor ground temperature is uniform, and the entire floor is a uniform radiant heat source. The ground mainly transfers heat to the indoor by radiation, and the indoor temperature decreases with the increase of height from bottom to top. This temperature distribution situation is most in line with the physiological needs of the human body, giving people a comfortable feeling of warm feet and cool head. During the heating process of floor heating, the ground is warm. It is reported that the heat of the ground can stimulate the acupoints in each part of the sole reflex area, which can regulate the central nervous system, dredge the meridians, improve blood circulation, promote metabolism, and enhance the body's immunity. In the fast-paced modern life, it is beneficial to relieve stress, relax the nerves, eliminate fatigue, improve sleep, and improve work and study efficiency. Floor heating is particularly suitable for the elderly and children.

[0003] In the past ten-odd years, this energy-saving heating method of floor heating has been widely applied all over the world. In 2008, the market share of floor heating in South Korea and Japan exceeded 60%, and the share in the European market also reached 40%. In cold regions, due to the limitations of electric heating and air-conditioning heating, floor radiation heating with boiler central heating is relatively popular. However, there are also some problems. For example, in cold and severely cold regions, the temperature is low, the heating capacity of the unit decays, and the actual radiant heat dissipation is small due to the blockage of beds and other objects in small bedrooms, resulting in poor heating effect; in the middle and lower reaches of the Yangtze River and southern humid and cold regions, the enclosure heat loss is large, the radiation heating is slow and insufficient in heat supply, and blindly increasing the water temperature increases the energy consumption of the air conditioner. In the hot summer and cold winter regions, the household heating mode mainly based on air-conditioning air supply in winter has insufficient comfort and usage requirements.

[0004] Therefore, the combination of an air source heat pump and a floor heating system is a comfortable and energy-saving air-conditioning heating solution. Some air-conditioning manufacturers have launched multi-connected air-conditioning units and multi-connected water units that support combined heating. When the heat pump unit is applied in a low-temperature and high-humidity area, there is an easy frosting problem. That is, when the temperature of the outdoor heat exchanger coil is lower than the air dew point temperature and the surface temperature of the outdoor heat exchanger coil is lower than 0°C, the water vapor in the air will undergo a phase change and frosting phenomenon on the surface of the outdoor heat exchanger coil. The continuous growth of the frost layer will reduce the air flow rate of the outdoor heat exchanger, increase the heat transfer thermal resistance, and lead to a decline in the heating performance of the heat pump unit. To ensure the heating performance of the heat pump unit, periodic defrosting is required. The defrosting methods of the heat pump unit in related solutions include: shutdown defrosting, electric heating defrosting, hot gas bypass defrosting, reverse cycle defrosting, energy storage defrosting, etc. The heat pump unit more often selects reverse cycle defrosting, during which the heating to the indoor will stop (even some defrosting methods need to absorb heat from the indoor), resulting in discontinuous heating and poor thermal comfort experience.

[0005] The above content is only used to assist in understanding the technical solution of the present invention and does not represent an admission that the above content is prior art. Summary of the Invention

[0006] The object of the present invention is to provide a multi-connected air-conditioning system and its control method to solve the problem that during the reverse cycle defrosting of the heat pump unit in the air source heat pump and the floor heating system, the heating to the indoor stops, resulting in discontinuous heating and poor thermal comfort experience for users. The effect is achieved by absorbing the energy of the water system during the defrosting process and supplying it for the indoor unit to heat and the outdoor heat exchanger to defrost, so that the heating is continuous and conducive to improving the thermal comfort experience of users.

[0007] The present invention provides a multi-connected unit system, comprising: a floor heating system and a refrigerant system; wherein, the floor heating system includes: a floor heating heat exchanger and a floor heating throttling element; the floor heating heat exchanger has a floor heating heat exchange pipeline and a refrigerant heat exchange pipeline; the refrigerant system is a combined heating and cooling multi-connected unit system; the combined heating and cooling multi-connected unit system includes: a compressor, an outdoor heat exchanger, an indoor unit, and a double four-way valve system; an outdoor throttling element is provided on the pipeline where the outdoor heat exchanger is located, and an indoor throttling element is provided between the first port and the second port of the indoor unit; the double four-way valve system includes: a first four-way valve and a second four-way valve; the first four-way valve has four valve ports, namely a first valve port, a second valve port, a third valve port, and a fourth valve port; the second four-way valve has four valve ports, namely a fifth valve port, a sixth valve port, a seventh valve port, and an eighth valve port; wherein, the exhaust port of the compressor is connected to the first valve port of the first four-way valve and is also connected to the fifth valve port of the second four-way valve; the second valve port of the first four-way valve, the sixth valve port of the second four-way valve, and the eighth valve port of the second four-way valve are all connected to the suction port of the compressor; the third valve port of the first four-way valve is connected to the first port of the refrigerant heat exchange pipeline; the fourth valve port of the first four-way valve, after being connected to the outdoor heat exchanger and the outdoor throttling element, is connected to the first port of the indoor unit and is also connected to the suction port of the compressor; the seventh valve port of the second four-way valve is connected to the second port of the indoor unit; the pipeline where the second port of the refrigerant heat exchange pipeline is located is connected to the first port of the indoor unit after passing through the floor heating throttling element.

[0008] In some embodiments, the floor heating system further includes: an electric auxiliary heating element; wherein, the electric auxiliary heating element is provided on the pipeline where the floor heating heat exchange pipeline is located.

[0009] In some embodiments, the combined heating and cooling multi-connected unit system further includes: a subcooler; wherein, the outdoor throttling element is provided on the pipeline between the outdoor heat exchanger and the subcooler, and a subcooling throttling element is provided on the auxiliary pipeline of the subcooler; the fourth valve port of the first four-way valve, after passing through the outdoor heat exchanger and the outdoor throttling element, then passes through the subcooler and is connected to the first port of the indoor unit, and also returns to the suction port of the compressor after passing through the subcooling throttling element on the auxiliary pipeline of the subcooler.

[0010] In some embodiments, it further includes: a gas-liquid separator; wherein, the second valve port of the first four-way valve, the sixth valve port of the second four-way valve, and the eighth valve port of the second four-way valve are all connected to the inlet of the gas-liquid separator; the fourth valve port of the first four-way valve is connected to the inlet of the gas-liquid separator after passing through the outdoor heat exchanger, the outdoor throttling element, and the subcooling throttling element on the auxiliary pipeline of the subcooler; the outlet of the gas-liquid separator is connected to the suction port of the compressor.

[0011] In some embodiments, it further includes: an oil separator; wherein, the exhaust port of the compressor is connected to the first port of the oil separator; the second port of the oil separator is connected to the suction port of the compressor; the third port of the oil separator is connected to the first valve port of the first four-way valve and is also connected to the fifth valve port of the second four-way valve.

[0012] In some embodiments, it further includes: a first oil return throttling element and a second oil return throttling element; wherein, the third port of the oil separator is connected to the suction port of the compressor after passing through the parallel first oil return throttling element and the second oil return throttling element.

[0013] In some embodiments, it further includes at least one of a high-pressure gas pipe valve, a gas pipe valve, and a liquid pipe valve; wherein, when the multi-connected system further includes a high-pressure gas pipe valve, the third valve port of the first four-way valve is connected to the first port of the refrigerant heat exchange pipeline after passing through the high-pressure gas pipe valve; when the multi-connected system further includes a gas pipe valve, the seventh valve port of the second four-way valve is connected to the second port of the indoor unit after passing through the gas pipe valve; when the multi-connected system further includes a liquid pipe valve, the fourth valve port of the first four-way valve is connected to the first port of the indoor unit after passing through the outdoor heat exchanger, the outdoor throttling element, the subcooler, and the liquid pipe valve.

[0014] In some embodiments, it further includes at least one of an expansion tank, a water flow switch, and a water pump; wherein, the first water port of the floor heating system is connected to the first port of the floor heating heat exchange pipeline after passing through the electric auxiliary heating element; the second water port of the floor heating system is connected to the second port of the floor heating heat exchange pipeline after passing through at least one of the expansion tank, the water flow switch, and the water pump.

[0015] Matched with the above multi-connected unit system, on the other hand, the present invention provides a control method for a multi-connected unit system, including: obtaining a defrost flag bit of a refrigerant system in the multi-connected unit system, and obtaining a floor heating water temperature of a floor heating system in the multi-connected unit system; controlling different opening and closing conditions of corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, and the floor heating throttling element according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, so that in different opening and closing conditions of corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, an indoor fan arranged in a matching manner with the indoor unit, and the floor heating throttling element, during the process of defrosting the outdoor heat exchanger by the multi-connected unit system, the energy of the floor heating system can be absorbed, provided to the indoor unit for heating, and provided to the outdoor heat exchanger for defrosting.

[0016] In some embodiments, it further includes: when the floor heating system further includes an electric auxiliary heating element, in different opening and closing conditions of corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, an indoor fan arranged in a matching manner with the indoor unit, the floor heating throttling element, and the electric auxiliary heating element, during the process of defrosting the outdoor heat exchanger by the multi-connected unit system, the energy of the floor heating system can be absorbed, provided to the indoor unit for heating, and provided to the outdoor heat exchanger for defrosting.

[0017] In some embodiments, it further includes: when the floor heating system further includes a subcooler, in different opening and closing conditions of corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, an indoor fan arranged in a matching manner with the indoor unit, the subcooling throttling element, and the floor heating throttling element, during the process of defrosting the outdoor heat exchanger by the multi-connected unit system, the energy of the floor heating system can be absorbed, provided to the indoor unit for heating, and provided to the outdoor heat exchanger for defrosting.

[0018] In some embodiments, according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, the opening and closing conditions of corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan configured to match the indoor unit, and the floor heating throttling element are controlled, including: according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, determining the current operation mode of the multi-split air conditioner system, and controlling the opening and closing conditions of corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan configured to match the indoor unit, and the floor heating throttling element in the current operation mode of the multi-split air conditioner system; wherein, when the multi-split air conditioner system further includes at least one of an electric auxiliary heating element and a subcooler, according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, determining the current operation mode of the multi-split air conditioner system, and controlling the opening and closing conditions of corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan configured to match the indoor unit, the subcooling throttling element, the floor heating throttling element, and the electric auxiliary heating element in the current operation mode of the multi-split air conditioner system; the current operation mode of the multi-split air conditioner system is any one of a refrigerant system single cooling mode, a refrigerant system single heating mode, a floor heating system single heating mode, and a refrigerant system and floor heating system simultaneous heating mode; wherein, according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, determining the current operation mode of the multi-split air conditioner system includes: if the defrost flag bit of the refrigerant system is a set value and the floor heating water temperature of the floor heating system is greater than or equal to a first set water temperature, determining that the current operation mode of the multi-split air conditioner system is a refrigerant system single heating mode; if the defrost flag bit of the refrigerant system is a set value, the floor heating water temperature of the floor heating system is greater than or equal to a second set water temperature and less than the first set water temperature, determining that the current operation mode of the multi-split air conditioner system is a refrigerant system and floor heating system simultaneous heating mode; if the defrost flag bit of the refrigerant system is a set value, the floor heating water temperature of the floor heating system is greater than or equal to a third set water temperature and less than the second set water temperature, determining that the current operation mode of the multi-split air conditioner system is a floor heating system single heating mode; if the defrost flag bit of the refrigerant system is a set value and the floor heating water temperature of the floor heating system is less than the third set water temperature, determining that the current operation mode of the multi-split air conditioner system is a refrigerant system single cooling mode.

[0019] In some embodiments, during defrosting in the separate refrigeration mode of the refrigerant system, the electromagnetic coils of the first four-way valve and the second four-way valve are both de-energized, the floor heating throttling element is closed, the outdoor throttling element is opened, the indoor fan is closed, and the indoor throttling element is opened but operates at an opening degree lower than the set value; in the case where the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is closed; in the case where the combined cooling and heating multi-connected unit system further includes a subcooler, the subcooling throttling element of the subcooler is closed; during defrosting in the separate heating mode of the refrigerant system, the first four-way valve is de-energized, the electromagnetic coil of the second four-way valve is energized, the floor heating throttling element is opened, and the outdoor throttling element is opened; in the case where the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is closed; in the case where the combined cooling and heating multi-connected unit system further includes a subcooler, the subcooling throttling element of the subcooler is closed; during defrosting in the separate heating mode of the floor heating system, the electromagnetic coil of the first four-way valve is de-energized, the electromagnetic coil of the second four-way valve is de-energized, the floor heating throttling element is opened, the outdoor throttling element is opened, and the indoor fan is closed; in the case where the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is opened; in the case where the combined cooling and heating multi-connected unit system further includes a subcooler, the subcooling throttling element of the subcooler is closed; during defrosting in the simultaneous heating mode of the refrigerant system and the floor heating system, the first four-way valve is de-energized, the electromagnetic coil of the second four-way valve is energized, the floor heating throttling element is opened, and the outdoor throttling element is opened; in the case where the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is opened; in the case where the combined cooling and heating multi-connected unit system further includes a subcooler, the subcooling throttling element of the subcooler is closed.

[0020] Thus, in the solution of the present invention, based on the combined cooling and heating multi-connected unit system, the spare valve port (such as the valve port where the blind tube is located) of one of the two four-way valves is used to lead to the floor heating flow path, and according to the defrosting flag bit of the combined cooling and heating multi-connected unit system and the floor heating water temperature, sustainable heating during the defrosting process of the outdoor heat exchanger is realized. Therefore, by absorbing the energy of the water system during the defrosting process and supplying it for the indoor unit to generate heat and the outdoor heat exchanger to defrost, the heating is continuous and is conducive to improving the thermal comfort experience of users.

[0021] Other features and advantages of the present invention will be described in the following description, and some will be obvious from the description or will be understood by implementing the present invention.

[0022] The technical solution of the present invention will be further described in detail below with reference to the drawings and embodiments. Description of the Drawings

[0023] Figure 1 It is a schematic structural diagram of an embodiment of the multi-connected unit system of the present invention;

[0024] Figure 2 It is a schematic structural diagram of an embodiment of a combined cooling and heating multi-connected air conditioner system in a related solution;

[0025] Figure 3 It is a schematic structural diagram of an embodiment of the continuous heating multi-connected air conditioner system of the present invention;

[0026] Figure 4 It is a schematic control flow diagram of an embodiment of the continuous heating multi-connected air conditioner system of the present invention;

[0027] Figure 5 It is a schematic flow diagram of an embodiment of the control method of the multi-connected air conditioner system of the present invention.

[0028] Combined with the accompanying drawings, the reference numerals in the embodiments of the present invention are as follows:

[0029] 1 - Compressor; 2 - Oil separator; 3 - First four-way valve; 4 - Second four-way valve; 5 - Condenser; 6 - Condensing fan; 7 - Heating electronic expansion valve; 8 - Subcooler; 9 - Subcooler electronic expansion valve; 10 - Gas-liquid separator; 11 - Oil return electronic expansion valve; 12 - High-pressure gas pipe valve; 13 - Gas pipe valve; 14 - Liquid pipe valve; 15 - Hot water generator; 16 - Plate heat exchanger; 17 - Generator electronic expansion valve; 20 - Indoor unit; 23 - Indoor unit electronic expansion valve; 26 - Indoor unit fan; 27 - Generator inlet temperature sensor; 28 - Generator outlet temperature sensor; 29 - Generator electric heater; 30 - Expansion tank; 31 - Flow switch; 32 - Water pump. Specific embodiments

[0030] To make the objectives, technical solutions, and advantages of the present invention clearer, the technical solutions of the present invention will be clearly and completely described below in conjunction with specific embodiments and corresponding drawings of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0031] According to an embodiment of the present invention, a multi-connected air conditioner system is provided. Refer to Figure 1 the schematic structural diagram of an embodiment of the device of the present invention as shown. The multi-connected air conditioner system may include: a floor heating system and a refrigerant system, and the refrigerant system such as a fluorine air handling unit system.

[0032] Among them, the floor heating system includes: a floor heating heat exchanger and a floor heating throttling element. The floor heating heat exchanger is, for example, a plate heat exchanger 16, and the floor heating throttling element is, for example, a generator electronic expansion valve 17. Preferably, the floor heating system further includes: an electric auxiliary heating element; wherein, the electric auxiliary heating element is arranged on the pipeline where the floor heating heat exchange pipeline is located. The electric auxiliary heating element is, for example, a generator electric heater 29. The floor heating heat exchanger has a floor heating heat exchange pipeline and a refrigerant heat exchange pipeline.

[0033] The refrigerant system is a two-in-one multi-connected air conditioner system. The two-in-one multi-connected air conditioner system includes: a compressor 1, an outdoor heat exchanger, an indoor unit 20, and a double four-way valve system. An outdoor throttling element is arranged on the pipeline where the outdoor heat exchanger is located, and an indoor throttling element is arranged between the first port and the second port of the indoor unit 20.

[0034] Preferably, the two-in-one multi-connected air conditioner system further includes: a subcooler 8. Among them, the outdoor throttling element is arranged on the pipeline between the outdoor heat exchanger and the subcooler 8, and a subcooling throttling element is arranged on the auxiliary pipeline of the subcooler 8; the fourth valve port of the first four-way valve 3 is connected to the first port of the indoor unit 20 after passing through the outdoor heat exchanger and the outdoor throttling element, and then passing through the subcooler 8, and also returns to the suction port of the compressor 1 after passing through the subcooling throttling element on the auxiliary pipeline of the subcooler 8.

[0035] In some embodiments, the number of the indoor units 20 is more than one, and more than one indoor unit 20 is arranged in parallel. An outdoor throttling element is arranged on the pipeline between the outdoor heat exchanger and the subcooler 8, a subcooling throttling element is arranged on the auxiliary pipeline of the subcooler 8, and an indoor throttling element is arranged between the first port and the second port of the indoor unit 20. The outdoor heat exchanger is, for example, a condenser 5, the outdoor throttling element is, for example, a heating electronic expansion valve 7, the subcooling throttling element is, for example, a subcooler electronic expansion valve 9, and the indoor throttling element is, for example, an indoor unit electronic expansion valve 23.

[0036] The exhaust port of the compressor 1 passes through the remaining valve ports (such as the remaining valve ports except the blind pipe port) of the two four-way valves in the double four-way valve system, on the one hand, it is connected to the first port of the indoor unit 20 through the outdoor heat exchanger and the subcooler 8, and on the other hand, it is directly connected to the second port of the indoor unit 20. The exhaust port of the compressor 1 also passes through the standby valve port (such as the blind pipe port) of one four-way valve in the double four-way valve system and is connected to the first port of the refrigerant heat exchange pipeline.

[0037] The electric auxiliary heating element is arranged on the pipeline where the floor heating heat exchange pipeline is located, and the floor heating throttling element is arranged on the pipeline where the second port of the refrigerant heat exchange pipeline is located. The pipeline where the second port of the refrigerant heat exchange pipeline is located is communicated to the first port of the indoor unit after passing through the floor heating throttling element.

[0038] Among them, in different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan matched with the indoor unit 20, the subcooling throttling element, and the floor heating throttling element, during the defrosting process of the outdoor heat exchanger of the multi-connected air conditioner system, it can absorb the energy of the floor heating system, supply heat to the indoor unit 20 for heating, and supply heat for defrosting the outdoor heat exchanger.

[0039] Aiming at the problem that during the reverse cycle defrosting of the heat pump unit in the air source heat pump and floor heating system, the heating to the indoor is stopped, resulting in discontinuous heating and poor thermal comfort experience for users. Combining the multi-connected air conditioner system for combined heating (when the indoor unit fluorine air panel + water floor heating are used for heating simultaneously, it is called 3D heating technology), the solution of the present invention proposes a multi-connected air conditioner system capable of continuously heating during the defrosting process of the outdoor heat exchanger, specifically a 3D heating technology for a multi-connected air conditioner system capable of continuously heating during the defrosting process of the outdoor heat exchanger. During the defrosting process, it absorbs the energy of the water system and supplies it for heating the indoor unit and defrosting the outdoor heat exchanger, which can effectively improve the problems of discontinuous heating and poor thermal comfort experience when the heat pump unit defrosts, and is beneficial to improving the thermal comfort experience of users.

[0040] Specifically, the double four-way valve system includes: a first four-way valve 3 and a second four-way valve 4. The first four-way valve 3 has four valve ports, namely a first valve port, a second valve port, a third valve port, and a fourth valve port. For example, the first four-way valve 3 has valve ports ①, ②, ③, and ④. The second four-way valve 4 has four valve ports, namely a fifth valve port, a sixth valve port, a seventh valve port, and an eighth valve port. For example, the second four-way valve 4 has valve ports ⑤, ⑥, ⑦, and ⑧.

[0041] Among them, the exhaust port of the compressor 1 is communicated to the first valve port of the first four-way valve 3 and is also communicated to the fifth valve port of the second four-way valve 4. The second valve port of the first four-way valve 3, the sixth valve port of the second four-way valve 4, and the eighth valve port of the second four-way valve 4 are all communicated to the suction port of the compressor 1.

[0042] The third valve port of the first four-way valve 3 is connected to the first port of the refrigerant heat exchange pipeline. The fourth valve port of the first four-way valve 3, after passing through the outdoor heat exchanger and the outdoor throttling element, on the one hand, is connected to the first port of the indoor unit 20 after passing through the subcooler 8, and on the other hand, returns to the suction port of the compressor 1 after passing through the subcooling throttling element on the auxiliary pipeline of the subcooler 8.

[0043] The seventh valve port of the second four-way valve 4 is connected to the second port of the indoor unit 20.

[0044] Figure 2 It is a schematic structural diagram of an embodiment of a combined cooling and heating multi-connected air conditioner system in the related solution. As Figure 2 shown, the combined cooling and heating multi-connected air conditioner system in the related solution includes: a compressor 1, an oil separator 2, a first four-way valve 3, a second four-way valve 4, a condenser 5, a condensing fan 6, a heating electronic expansion valve 7, a subcooler 8, a subcooler electronic expansion valve 9, a gas-liquid separator 10, an oil return electronic expansion valve 11, a high-pressure gas pipe valve 12, a gas pipe valve 13, a liquid pipe valve 14, a hot water generator 15, a plate heat exchanger 16, a generator electronic expansion valve 17, an indoor unit 20, an indoor unit electronic expansion valve 23, an indoor unit fan 26, a generator inlet temperature sensor 27, a generator outlet temperature sensor 28, a generator electric heater 29, an expansion tank 30, a water flow switch 31, and a water pump 32. The first four-way valve 3 and the second four-way valve 4 form a set of double four-way valve systems. For each four-way valve in the first four-way valve 3 and the second four-way valve 4, the upper pipe is the high-pressure exhaust side and the lower pipe is the low-pressure suction side. The first four-way valve 3 has valve ports ①, ②, ③, and ④, and the second four-way valve 4 has valve ports ⑤, ⑥, ⑦, and ⑧.

[0045] In Figure 2 the example shown, the exhaust port of the compressor 1 is connected to the first port of the oil separator 2. The second port of the oil separator 2 is connected to the suction port of the compressor 1 on the one hand through a throttle capillary tube, and to the suction port of the oil return electronic expansion valve 11 on the other hand. The suction port of the compressor 1 is also connected to the first port of the gas-liquid separator 10.

[0046] In Figure 2In the example shown, the third port of the oil separator 2 is connected to the valve port ① of the first four-way valve 3 on the one hand, to the valve port ⑤ of the second four-way valve 4 on the other hand, and to the first port of the first heat exchange pipeline of the plate heat exchanger 16 after passing through the high-pressure gas pipeline valve 12. The valve port ② of the first four-way valve 3 is connected to the second port of the gas-liquid separator 10. The valve port ③ of the first four-way valve 3 is connected to the second port of the gas-liquid separator 10 after passing through the throttle capillary tube. The second port of the first heat exchange pipeline of the plate heat exchanger 16 is connected to the first port of the indoor unit 20 through the generator electronic expansion valve 17. The indoor unit fan 26 is arranged in cooperation with the indoor unit 20. The connection between the second port of the first heat exchange pipeline of the plate heat exchanger 16 and the first port of the indoor unit 20 is also connected to the first port of the first heat exchange pipeline of the subcooler 8 after passing through the liquid pipeline valve 14. The second port of the first heat exchange pipeline of the subcooler 8 is connected to the first port of the condenser 5 after passing through the heating electronic expansion valve 7. The condenser fan 6 is arranged in cooperation with the condenser 5. An auxiliary pipeline is arranged between the first port of the second heat exchange pipeline of the subcooler 8 and the second port of the first heat exchange pipeline of the subcooler 8, and a subcooler electronic expansion valve 9 is arranged on this auxiliary pipeline. The heating electronic expansion valve 7 is arranged at the connection between the auxiliary pipeline of the subcooler 8 and the second port of the first heat exchange pipeline of the subcooler 8, between it and the first port of the condenser 5. The second port of the condenser 5 is connected to the valve port ④ of the first four-way valve 3. An indoor unit electronic expansion valve 23 is arranged between the first port and the second port of the indoor unit 20. The second port of the indoor unit 20 is connected to the valve port ⑦ of the second four-way valve 4 after passing through the gas pipeline valve 13. The valve port ⑧ of the second four-way valve 4 is connected to the second port of the gas-liquid separator 10 after passing through the throttle capillary tube. The valve port ⑥ of the second four-way valve 4 is connected to the second port of the gas-liquid separator 10.

[0047] In Figure 2 In the example shown, the first port of the floor heating is connected to the first port of the second heat exchange pipeline of the plate heat exchanger 16 after passing through the generator electric heater 29. The second port of the floor heating is connected to the second port of the second heat exchange pipeline of the plate heat exchanger 16 after passing through the water pump 32. An expansion tank 30 and a water flow switch 31 are arranged on the pipeline between the second port of the floor heating and the water pump 32. The plate heat exchanger 16, the generator electronic expansion valve 17, the generator electric heater 29, the expansion tank 30, the water flow switch 31, and the water pump 32 form a hot water generator 15. A generator outlet temperature sensing package 28 is arranged between the first port of the floor heating and the hot water generator 15. A generator inlet temperature sensing package 27 is arranged between the second port of the floor heating and the hot water generator 15.

[0048] Figure 2The example shown is a common two-in-one multi-connected air-conditioning system. There is one unused spare valve port (such as the valve port where the blind tube is located) in both the first four-way valve 3 and the second four-way valve 4. That is, the pipelines of valve port ③ of the first four-way valve 3 and valve port ⑧ of the second four-way valve 4 are mainly reserved for the research and development of multi-functional products with domestic hot water function. Figure 3 It is a schematic structural diagram of an embodiment of the continuous heating multi-connected air-conditioning system of the present invention. Figure 3 The example shown is based on Figure 2 the improvement made on the example shown. Figure 3 In the example shown, a spare valve port (such as the valve port where the blind tube is located) of one four-way valve in the pipelines of valve port ③ of the first four-way valve 3 and valve port ⑧ of the second four-way valve 4 is used and leads to the floor heating flow path. By cooperating with the system control method, the sustainable heating technology during the defrosting process of the outdoor heat exchanger can be realized.

[0049] In some embodiments, the multi-connected air-conditioning system further includes: a gas-liquid separator 10.

[0050] Among them, the second valve port of the first four-way valve 3, the sixth valve port of the second four-way valve 4, and the eighth valve port of the second four-way valve 4 are all connected to the inlet of the gas-liquid separator 10. The fourth valve port of the first four-way valve 3 is connected to the inlet of the gas-liquid separator 10 after passing through the outdoor heat exchanger, the outdoor throttling element, and the subcooling throttling element on the auxiliary pipeline of the subcooler 8. The outlet of the gas-liquid separator 10 is connected to the suction port of the compressor 1.

[0051] In some embodiments, the multi-connected air-conditioning system further includes: an oil separator 2.

[0052] Among them, the exhaust port of the compressor 1 is connected to the first port of the oil separator 2. The second port of the oil separator 2 is connected to the suction port of the compressor 1. The third port of the oil separator 2 is connected to the first valve port of the first four-way valve 3 and is also connected to the fifth valve port of the second four-way valve 4.

[0053] In some embodiments, the multi-connected air-conditioning system further includes: at least one of a high-pressure gas pipe valve 12, a gas pipe valve 13, and a liquid pipe valve 14.

[0054] Among them, the third port of the oil separator 2 is connected to the suction port of the compressor 1 after passing through the first oil return throttling element and the second oil return throttling element connected in parallel.

[0055] In some embodiments, the multi-connected air-conditioning system further includes: at least one of a high-pressure gas pipe valve 12, a gas pipe valve 13, and a liquid pipe valve 14.

[0056] Wherein, when the multi-connected air conditioner system further includes a high-pressure gas pipe valve 12, the third valve port of the first four-way valve 3 is connected to the first port of the refrigerant heat exchange pipeline after passing through the high-pressure gas pipe valve 12.

[0057] When the multi-connected air conditioner system further includes an air pipe valve 13, the seventh valve port of the second four-way valve 4 is connected to the second port of the indoor unit 20 after passing through the air pipe valve 13.

[0058] When the multi-connected air conditioner system further includes a liquid pipe valve 14, the fourth valve port of the first four-way valve 3 is connected to the first port of the indoor unit 20 after passing through the outdoor heat exchanger, the outdoor throttling element, the sub-cooler 8 and the liquid pipe valve 14.

[0059] A 3D heating technology for a multi-connected air conditioner that can continuously supply heat during the defrosting process of an outdoor heat exchanger proposed by the solution of the present invention includes a double four-way valve system, which can support continuous heating during the defrosting process of the outdoor heat exchanger. As Figure 3 shown, the continuous heating multi-connected air conditioner system provided by the solution of the present invention includes: a compressor 1, an oil separator 2, a first four-way valve 3, a second four-way valve 4, a condenser 5, a condensing fan 6, a heating electronic expansion valve 7, a sub-cooler 8, a sub-cooler electronic expansion valve 9, a gas-liquid separator 10, an oil return electronic expansion valve 11, a high-pressure gas pipe valve 12, an air pipe valve 13, a liquid pipe valve 14, a hot water generator 15, a plate heat exchanger 16, a generator electronic expansion valve 17, an indoor unit 20, an indoor unit electronic expansion valve 23, an indoor unit fan 26, a generator inlet temperature sensor 27, a generator outlet temperature sensor 28, a generator electric heater 29, an expansion tank 30, a water flow switch 31, and a water pump 32. The first four-way valve 3 and the second four-way valve 4 constitute a double four-way valve system. The upper pipe of each four-way valve in the first four-way valve 3 and the second four-way valve 4 is the high-pressure exhaust side, and the lower pipe is the low-pressure suction side. The first four-way valve 3 has valve ports ①, ②, ③, and ④, and the second four-way valve 4 has valve ports ⑤, ⑥, ⑦, and ⑧.

[0060] In Figure 3 the example shown, the exhaust port of the compressor 1 is connected to the first port of the oil separator 2. The second port of the oil separator 2 is connected to the suction port of the compressor 1 through a throttling capillary on the one hand, and to the suction port of the oil return electronic expansion valve 11 on the other hand. The suction port of the compressor 1 is also connected to the first port of the gas-liquid separator 10.

[0061] In Figure 3In the example shown, the third port of the oil separator 2 is connected to the valve port ① of the first four-way valve 3 on the one hand and to the valve port ⑤ of the second four-way valve 4 on the other hand. The valve port ② of the first four-way valve 3 is connected to the second port of the gas-liquid separator 10. The valve port ③ of the first four-way valve 3 is connected to the first port of the first heat exchange pipeline of the plate heat exchanger 16 after passing through the high-pressure gas pipeline valve 12. The second port of the first heat exchange pipeline of the plate heat exchanger 16 is connected to the first port of the indoor unit 20 through the generator electronic expansion valve 17. The indoor unit fan 26 is arranged in cooperation with the indoor unit 20. The connection between the second port of the first heat exchange pipeline of the plate heat exchanger 16 and the first port of the indoor unit 20 is also connected to the first port of the first heat exchange pipeline of the subcooler 8 after passing through the liquid pipeline valve 14. The second port of the first heat exchange pipeline of the subcooler 8 is connected to the first port of the condenser 5 through the heating electronic expansion valve 7. The condensing fan 6 is arranged in cooperation with the condenser 5. An auxiliary pipeline is provided between the first port of the second heat exchange pipeline of the subcooler 8 and the second port of the first heat exchange pipeline of the subcooler 8, and a subcooler electronic expansion valve 9 is provided on this auxiliary pipeline. The heating electronic expansion valve 7 is arranged at the connection between the auxiliary pipeline of the subcooler 8 and the second port of the first heat exchange pipeline of the subcooler 8, between it and the first port of the condenser 5. The second port of the condenser 5 is connected to the valve port ④ of the first four-way valve 3. An indoor unit electronic expansion valve 23 is provided between the first port and the second port of the indoor unit 20. The second port of the indoor unit 20 is connected to the valve port ⑦ of the second four-way valve 4 after passing through the gas pipeline valve 13. The valve port ⑧ of the second four-way valve 4 is connected to the second port of the gas-liquid separator 10 after passing through the throttle capillary. The valve port ⑥ of the second four-way valve 4 is connected to the second port of the gas-liquid separator 10.

[0062] In some embodiments, the multi-connected air conditioner system further includes at least one of an expansion tank 30, a water flow switch 31, and a water pump 32.

[0063] Among them, the first water port of the floor heating system is connected to the first port of the floor heating heat exchange pipeline after passing through the electric auxiliary heating element. The second water port of the floor heating system is connected to the second port of the floor heating heat exchange pipeline after passing through at least one of the expansion tank 30, the water flow switch 31, and the water pump 32.

[0064] In Figure 3In the example shown, the first port of the floor heating is connected to the first port of the second heat exchange pipeline of the plate heat exchanger 16 after passing through the generator electric heater 29. The second port of the floor heating is connected to the second port of the second heat exchange pipeline of the plate heat exchanger 16 after passing through the water pump 32. An expansion tank 30 and a water flow switch 31 are provided on the pipeline between the second port of the floor heating and the water pump 32. The plate heat exchanger 16, the generator electronic expansion valve 17, the generator electric heater 29, the expansion tank 30, the water flow switch 31, and the water pump 32 form a hot water generator 15. A generator outlet temperature sensing bulb 28 is provided between the first port of the floor heating and the hot water generator 15. A generator inlet temperature sensing bulb 27 is provided between the second port of the floor heating and the hot water generator 15.

[0065] In some embodiments, in different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan matched with the indoor unit 20, the subcooling throttling element, and the floor heating throttling element, during the defrosting process of the outdoor heat exchanger by the multi-split air conditioner system, it can absorb the energy of the floor heating system, provide heating to the indoor unit 20, and provide defrosting for the outdoor heat exchanger, including: the multi-split air conditioner system can perform defrosting in any one of the refrigerant system single cooling mode, the refrigerant system single heating mode, the floor heating system single heating mode, and the refrigerant system and floor heating system simultaneous heating mode. The refrigerant system single cooling mode is such as the only fan coil cooling mode, the refrigerant system single heating mode is such as the only fan coil heating mode, the floor heating system single heating mode is such as the only floor heating heating mode, and the refrigerant system and floor heating system simultaneous heating mode is such as the fan coil and floor heating simultaneous heating mode.

[0066] Among them, when defrosting in the refrigerant system single cooling mode, the electromagnetic coils of the first four-way valve 3 and the second four-way valve 4 are not energized, the floor heating throttling element is closed, the outdoor throttling element is opened, the subcooling throttling element is closed, the indoor fan is closed, the indoor throttling element is opened but operates at an opening degree lower than the set value; in the case where the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is closed.

[0067] In Figure 3 In the example shown, when only the fan coil is cooling: the electromagnetic coils of the first four-way valve 3 and the second four-way valve 4 are not energized, the generator electronic expansion valve 17 is closed, the heating electronic expansion valve 7 is always open, and the subcooler electronic expansion valve 9 and the indoor unit electronic expansion valve 23 operate normally.

[0068] At this time, the valve port ① of the first four-way valve 3 is in communication with the valve port ④ of the first four-way valve 3, and the valve port ⑤ of the second four-way valve 4 is in communication with the valve port ⑧ of the second four-way valve 4. Since an additional throttling capillary tube is added to the pipeline outlet of the valve port ⑧ of the second four-way valve 4 and is directly in communication with a low-pressure suction pipe leading to the gas-liquid separator 10 (such as the second port of the gas-liquid separator 10), this path can be understood as a path where the refrigerant does not flow. The high-pressure exhaust gas of the compressor 1 flows into the condenser 5 through the four-way valve 3, and after being throttled once by the heating electronic expansion valve 7, the main liquid refrigerant flows through the subcooler 8 and is subcooled and then circulates to the indoor unit 20 for refrigeration. The auxiliary liquid refrigerant is throttled by the subcooler electronic expansion valve 9 and then returns to the suction side of the gas-liquid separator 10 (such as the second port of the gas-liquid separator 10) to provide the cooling capacity required for subcooling the main refrigerant.

[0069] During defrosting in the separate heating mode of the refrigerant system, the first four-way valve 3 is not powered on, the electromagnetic coil of the second four-way valve 4 is powered on, the floor heating throttling element is opened, the outdoor throttling element is opened, and the subcooling throttling element is closed; in the case where the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is closed.

[0070] In Figure 3 In the example shown, when only the air handling unit is for heating: the electromagnetic coils of the first four-way valve 3 and the second four-way valve 4 are powered on, the generator electronic expansion valve 17 is closed, the subcooler electronic expansion valve 9 is closed, the indoor unit electronic expansion valve 23 is normally open, and the heating electronic expansion valve 7 operates normally.

[0071] At this time, the valve port ① of the first four-way valve 3 is in communication with the valve port ③ of the first four-way valve 3, and the valve port ⑤ of the second four-way valve 4 is in communication with the valve port ⑦ of the second four-way valve 4. Since the generator electronic expansion valve 17 is closed, at this time, the high-pressure exhaust gas of the compressor 1 only passes through the valve port ⑤ and the valve port ⑦ of the second four-way valve 4 to the indoor unit 20 for heating, is condensed and then throttled by the heating electronic expansion valve 7, and then enters the outdoor heat exchanger for evaporation and returns to the compressor 1.

[0072] During defrosting in the separate heating mode of the floor heating system, the electromagnetic coil of the first four-way valve 3 is not powered on, the electromagnetic coil of the second four-way valve 4 is not powered on, the floor heating throttling element is opened, the outdoor throttling element is opened, the subcooling throttling element is closed, and the indoor fan is closed; in the case where the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is powered on.

[0073] In Figure 3 In the example shown, when only the floor heating is for heating: the electromagnetic coil of the first four-way valve 3 is powered on and the electromagnetic coil of the second four-way valve 4 is not powered on, the generator electronic expansion valve 17 is normally open, the indoor unit electronic expansion valve 23 is closed (for a multi-connected unit with multiple indoor units, only one indoor unit is described here as an example), the subcooler electronic expansion valve 9 is closed, and the heating electronic expansion valve 7 operates normally.

[0074] At this time, the valve port ① of the first four-way valve 3 is in communication with the valve port ③ of the first four-way valve 3, and the valve port ⑤ of the second four-way valve 4 is in communication with the valve port ⑦ of the second four-way valve 4. Since the indoor unit electronic expansion valve 23 is closed, at this time, the high-pressure exhaust gas of the compressor 1 only passes through the valve port ① and the valve port ③ of the first four-way valve 3 to the floor heating water heater (i.e., the water heater 15) for heating. After condensation, it is throttled by the heating electronic expansion valve 7, and then enters the outdoor heat exchanger for evaporation, and returns to the compressor 1.

[0075] When defrosting in the simultaneous heating mode of the refrigerant system and the floor heating system, the first four-way valve 3 is not powered on, the electromagnetic coil of the second four-way valve 4 is powered on, the floor heating throttling element is opened, the outdoor throttling element is opened, and the subcooling throttling element is closed; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is opened.

[0076] In Figure 3 In the example shown, when the air handling unit and the floor heating are heating simultaneously: the electromagnetic coils of the first four-way valve 3 and the second four-way valve 4 are powered on, the generator electronic expansion valve 17 is normally open, the indoor unit electronic expansion valve 23 is normally open, the subcooler electronic expansion valve 9 is closed, and the heating electronic expansion valve 7 operates normally.

[0077] At this time, the valve port ① of the first four-way valve 3 is in communication with the valve port ③ of the first four-way valve 3, and the valve port ⑤ of the second four-way valve 4 is in communication with the valve port ⑦ of the second four-way valve 4. The high-pressure exhaust gas of the compressor 1 passes through the valve port ① and the valve port ③ of the first four-way valve 3 to the floor heating water heater (i.e., the water heater 15) for heating, and passes through the valve port ⑤ and the valve port ⑦ of the second four-way valve 4 to the indoor unit 20 for heating. After condensation, it is throttled by the heating electronic expansion valve 7, and then enters the outdoor heat exchanger for evaporation, and returns to the compressor 1.

[0078] Adopting the technical solution of the present invention, based on the two-stage multi-connected air conditioner system, by using the spare valve port (such as the valve port where the blind pipe is located) of one of the two four-way valves, it leads to the floor heating flow path, and according to the defrosting flag bit of the two-stage multi-connected air conditioner system and the floor heating water temperature, the sustainable heating during the defrosting process of the outdoor heat exchanger is realized. Thus, by absorbing the energy of the water system during the defrosting process and supplying it for heating the indoor unit and defrosting the outdoor heat exchanger, the heating is continuous and beneficial to improving the thermal comfort experience of users.

[0079] According to an embodiment of the present invention, there is also provided a control method for a multi-connected air conditioner system corresponding to the multi-connected air conditioner system, as Figure 5 shown in the flowchart of an embodiment of the method of the present invention. The control method for the multi-connected air conditioner system may include: step S110 to step S120.

[0080] At step S110, obtain the defrost flag bit of the refrigerant system in the multi-connected unit system, and obtain the floor heating water temperature of the floor heating system in the multi-connected unit system.

[0081] At step S120, according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, control the opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, and the floor heating throttling element, so that in the case of different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan arranged in matching with the indoor unit 20, and the floor heating throttling element, during the defrosting process of the outdoor heat exchanger by the multi-connected unit system, it can absorb the energy of the floor heating system, provide heating to the indoor unit 20, and provide defrosting for the outdoor heat exchanger.

[0082] Preferably, in step S120, when the floor heating system further includes an electric auxiliary heating element, in the case of different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan arranged in matching with the indoor unit 20, the floor heating throttling element, and the electric auxiliary heating element, during the defrosting process of the outdoor heat exchanger by the multi-connected unit system, it can absorb the energy of the floor heating system, provide heating to the indoor unit 20, and provide defrosting for the outdoor heat exchanger.

[0083] Preferably, in step S120, when the floor heating system further includes a subcooler 8, in the case of different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan arranged in matching with the indoor unit 20, the subcooling throttling element, and the floor heating throttling element, during the defrosting process of the outdoor heat exchanger by the multi-connected unit system, it can absorb the energy of the floor heating system, provide heating to the indoor unit 20, and provide defrosting for the outdoor heat exchanger.

[0084] Aiming at the problem that during the reverse cycle defrosting of the heat pump unit in the air source heat pump and floor heating system, the heating to the indoor is stopped, resulting in discontinuous heating and poor thermal comfort experience for users. Combining with the multi-connected unit system for combined heating (when the indoor unit fluorine air panel + water floor heating are used for heating at the same time, it is called 3D heating technology), the solution of the present invention proposes a multi-connected unit system capable of sustainable heating during the defrosting process of the outdoor heat exchanger, specifically a 3D heating technology for the multi-connected unit system capable of sustainable heating during the defrosting process of the outdoor heat exchanger. During the defrosting process, it absorbs the energy of the water system and supplies it for heating the indoor unit and defrosting the outdoor heat exchanger, which can effectively improve the problems of discontinuous heating and poor thermal comfort experience during the defrosting of the heat pump unit, and is beneficial to improving the thermal comfort experience of users.

[0085] In some embodiments, in step S120, according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, controlling the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan arranged in matching with the indoor unit 20, and the floor heating throttling element, includes: determining the current operation mode of the multi-connected unit system according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, and controlling the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan arranged in matching with the indoor unit 20, and the floor heating throttling element in the current operation mode of the multi-connected unit system.

[0086] Wherein, when at least one of an electric auxiliary heating element and a subcooler 8 is further included in the multi-connected unit system, determining the current operation mode of the multi-connected unit system according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, and controlling the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan arranged in matching with the indoor unit 20, the subcooling throttling element, the floor heating throttling element, and the electric auxiliary heating element in the current operation mode of the multi-connected unit system.

[0087] The current operation mode of the multi-connected unit system is any one of a refrigerant system independent cooling mode, a refrigerant system independent heating mode, a floor heating system independent heating mode, and a refrigerant system and floor heating system simultaneous heating mode.

[0088] Wherein, when defrosting in the refrigerant system independent cooling mode, the electromagnetic coils of the first four-way valve 3 and the second four-way valve 4 are not powered on, the floor heating throttling element is closed, the outdoor throttling element is opened, the indoor fan is closed, and the indoor throttling element is opened but operates at an opening degree lower than the set value; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is closed; when the combined heating and cooling multi-connected unit system further includes a subcooler 8, the subcooling throttling element of the subcooler 8 is closed;

[0089] When defrosting in the refrigerant system independent heating mode, the first four-way valve 3 is not powered on, the electromagnetic coil of the second four-way valve 4 is powered on, the floor heating throttling element is opened, and the outdoor throttling element is opened; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is closed; when the combined heating and cooling multi-connected unit system further includes a subcooler 8, the subcooling throttling element of the subcooler 8 is closed;

[0090] When defrosting in the separate heating mode of the floor heating system, the electromagnetic coil of the first four-way valve 3 is de-energized, the electromagnetic coil of the second four-way valve 4 is de-energized, the floor heating throttle element is opened, the outdoor throttle element is opened, and the indoor fan is turned off; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is turned on; when the combined heating and cooling multi-split system further includes a subcooler 8, the subcooling throttle element of the subcooler 8 is closed;

[0091] When defrosting in the simultaneous heating mode of the refrigerant system and the floor heating system, the first four-way valve 3 is de-energized, the electromagnetic coil of the second four-way valve 4 is energized, the floor heating throttle element is opened, and the outdoor throttle element is opened; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is turned on; when the combined heating and cooling multi-split system further includes a subcooler 8, the subcooling throttle element of the subcooler 8 is closed.

[0092] Figure 4 It is a schematic diagram of the control flow of an embodiment of the continuous heating multi-split system of the present invention. As Figure 4 shown, the control flow of the continuous heating multi-split system provided by the solution of the present invention includes:

[0093] Step 1: When the unit of the continuous heating multi-split system continuously heats and the outdoor heat exchanger has a lot of frost, the unit will enter the defrosting operation according to the preset defrost control logic. The logic for detecting the need to enter defrosting is relatively complex, and here it is uniformly understood according to the flag bit F 除霜 = 1.

[0094] Step 2: The average value of the floor heating inlet and outlet temperature sensors, such as the generator inlet temperature sensor 27 and the generator outlet temperature sensor 28, is the floor heating water temperature T 水 .

[0095] Step 3: According to the defrost flag bit F 除霜 = 1 and the floor heating water temperature T 水 , control the operation process of the continuous heating multi-split system. For specific details, please refer to the following exemplary description.

[0096] Among them, determining the current operation mode of the multi-split system according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system includes any of the following determination cases:

[0097] The first determination case: If the defrost flag bit of the refrigerant system is a set value and the floor heating water temperature of the floor heating system is greater than or equal to the first set water temperature, it is determined that the current operation mode of the multi-split system is the separate heating mode of the refrigerant system. The first set water temperature is, for example, 35°C.

[0098] In Figure 4In the example shown, 1) when the defrost flag bit F 除霜 = 1 and the floor heating water temperature T 水 ≥ 35°C, the fan coil unit is supported to operate for heating during defrosting.

[0099] At this time, the electromagnetic coil of the first four-way valve 3 is de-energized, the electromagnetic coil of the second four-way valve 4 is energized, the heating electronic expansion valve 7 is normally open, the subcooler electronic expansion valve 9 is closed, the high-pressure exhaust gas of the compressor 1 passes through the port ① of the first four-way valve 3 and the port ④ of the first four-way valve 3 to the outdoor heat exchanger for defrosting, and one way passes through the port ⑤ of the second four-way valve 4 and the port ⑦ of the second four-way valve 4 to the indoor unit 20 for heating. After condensation, the high-pressure liquid refrigerant is throttled by the generator electronic expansion valve 17 and evaporates in the floor heating water generator (such as the hot water generator 15), absorbs the heat of the floor heating water, and returns to the compressor 1 through the port ③ of the first four-way valve 3 and the port ② of the first four-way valve 3 for suction to complete the cycle.

[0100] The second determination case: If the defrost flag bit of the refrigerant system is a set value, and the floor heating water temperature of the floor heating system is greater than or equal to the second set water temperature and less than the first set water temperature, then it is determined that the current operating mode of the multi-split air conditioner system is the simultaneous heating mode of the refrigerant system and the floor heating system. The second set water temperature is, for example, 10°C.

[0101] In Figure 4 the example shown, 2) when the defrost flag bit F 除霜 = 1 and 20°C ≤ floor heating water temperature T 水 < 35°C, the fan coil unit is supported to operate for heating during defrosting, but the generator electric heater 29 needs to be turned on, and the floor heating outlet temperature sensor still operates under the control of the target water temperature during the electric auxiliary heating startup process.

[0102] At this time, the electromagnetic coil of the first four-way valve 3 is de-energized, the electromagnetic coil of the second four-way valve 4 is energized, the heating electronic expansion valve 7 is normally open, the subcooler electronic expansion valve 9 is closed, the generator electronic expansion valve 17 operates normally, the high-pressure exhaust gas of the compressor 1 passes through the port ① of the first four-way valve 3 and the port ④ of the first four-way valve 3 to the outdoor heat exchanger for defrosting, and one way passes through the port ⑤ of the second four-way valve 4 and the port ⑦ of the second four-way valve 4 to the indoor unit 20 for heating. After condensation, the high-pressure liquid refrigerant is throttled by the generator electronic expansion valve 17 and evaporates in the floor heating water generator (such as the hot water generator 15), absorbs the heat of the floor heating water, and returns to the compressor 1 through the port ③ of the first four-way valve 3 and the port ② of the first four-way valve 3 for suction to complete the cycle.

[0103] The third determination case: If the defrost flag bit of the refrigerant system is a set value, and the floor heating water temperature of the floor heating system is greater than or equal to the third set water temperature and less than the second set water temperature, then it is determined that the current operating mode of the multi-split air conditioner system is the single heating mode of the floor heating system. The third set water temperature is, for example, 10°C.

[0104] In Figure 4 the example shown in 3), when the defrost flag bit F 除霜 = 1 and 10°C ≤ the water temperature of the floor heating T 水 < 20°C, during defrosting, the air handling unit heating operation is not supported, but heat absorption from the floor heating water is supported to accelerate defrosting completion. The generator electric heater 29 needs to be turned on, and the floor heating outlet temperature sensor is still controlled by the target water temperature during the electric auxiliary heating startup process.

[0105] At this time, the electromagnetic coils of the first four-way valve 3 and the second four-way valve 4 are not energized, the indoor fans 26 are all turned off, the heating electronic expansion valve 7 is normally open, the subcooler electronic expansion valve 9 is closed, the generator electronic expansion valve 17 works normally, the high-pressure exhaust gas of the compressor 1 passes through the port ① of the first four-way valve 3 and the port ④ of the first four-way valve 3 to the outdoor heat exchanger (such as the condenser 5) for defrosting. After condensation, the high-pressure liquid refrigerant passes through the generator electronic expansion valve 17 for throttling and then evaporates in the floor heating water generator, absorbs the heat of the floor heating water, passes through the port ③ of the first four-way valve 3 and the port ② of the first four-way valve 3 to return to the compressor 1 for suction, and completes the cycle.

[0106] The fourth determination case: If the defrost flag bit of the refrigerant system is a set value and the water temperature of the floor heating system is less than the third set water temperature, it is determined that the current operation mode of the multi-split air conditioner system is the refrigerant system single refrigeration mode.

[0107] In Figure 4 the example shown in 4), when the defrost flag bit F 除霜 = 1 and the water temperature of the floor heating T 水 < 10°C, during defrosting, the air handling unit heating operation is not supported, and heat absorption from the floor heating water is not supported.

[0108] At this time, the electromagnetic coils of the first four-way valve 3 and the second four-way valve 4 are not energized, the heating electronic expansion valve 7 works, the subcooler electronic expansion valve 9 is closed, the generator electronic expansion valve 17 is closed, the indoor fans 26 etc. are all turned off, the indoor unit electronic expansion valve 23 works normally, the high-pressure exhaust gas of the compressor 1 passes through the port ① of the first four-way valve 3 and the port ④ of the first four-way valve 3 to the outdoor heat exchanger for defrosting. After condensation, the high-pressure liquid refrigerant passes through the electronic expansion valve 23 for throttling, absorbs heat, passes through the port ⑥ of the second four-way valve 4 and the port ⑦ of the second four-way valve 4 to return to the compressor 1 for suction, and completes the cycle.

[0109] The 3D heating technology for multi-connected air conditioners that enables continuous heating during the defrosting process of the outdoor heat exchanger proposed in the solution of the present invention can solve the problems of discontinuous heating during reverse-cycle defrosting and poor thermal comfort experience on the basis of the multi-connected air conditioner system that originally supports 3D heating technology by improving the control method, without adding any costs. Moreover, in the solution of the present invention, when the low floor heating water temperature is reached, defrosting methods such as shutdown defrosting, electric heating defrosting, hot gas bypass defrosting, reverse-cycle defrosting, and energy storage defrosting in related solutions can still be used for defrosting.

[0110] Since the processing and functions implemented by the method of this embodiment are basically corresponding to the embodiments, principles, and examples of the aforementioned multi-connected air conditioner system, for the details not described in the description of this embodiment, reference can be made to the relevant descriptions in the aforementioned embodiments and will not be elaborated here.

[0111] Adopting the technical solution of this embodiment, on the basis of a two-connected multi-connected air conditioner system, the spare valve port (such as the valve port where the blind tube is located) of one of the two four-way valves is led to the floor heating flow path, and according to the defrost flag bit of the two-connected multi-connected air conditioner system and the floor heating water temperature, continuous heating can be achieved during the defrosting process of the outdoor heat exchanger, which is beneficial to improving the comfort experience of users, can solve the problems of discontinuous heating during reverse-cycle defrosting and poor thermal comfort experience, and does not increase any costs.

[0112] In summary, it is easy for those skilled in the art to understand that, on the premise of no conflict, the above advantageous methods can be freely combined and superimposed.

[0113] The above are only the embodiments of the present invention and are not used to limit the present invention. For those skilled in the art, the present invention can have various changes and modifications. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included within the scope of the claims of the present invention.

Claims

1. A multi-connected air-conditioning system, characterized in that, Including: A floor heating system and a refrigerant system; wherein, The floor heating system includes a floor heating heat exchanger and a floor heating throttling element; the floor heating heat exchanger has a floor heating heat exchange pipeline and a refrigerant heat exchange pipeline; The refrigerant system is a combined heating and cooling multi-split air conditioner system; the combined heating and cooling multi-split air conditioner system includes a compressor (1), an outdoor heat exchanger, an indoor unit (20), and a double four-way valve system; an outdoor throttling element is provided on the pipeline where the outdoor heat exchanger is located, and an indoor throttling element is provided between the first port and the second port of the indoor unit (20); The double four-way valve system includes a first four-way valve (3) and a second four-way valve (4); the first four-way valve (3) has four valve ports, namely a first valve port, a second valve port, a third valve port, and a fourth valve port; the second four-way valve (4) has four valve ports, namely a fifth valve port, a sixth valve port, a seventh valve port, and an eighth valve port; wherein, The exhaust port of the compressor (1) is connected to the first valve port of the first four-way valve (3) and also connected to the fifth valve port of the second four-way valve (4); the second valve port of the first four-way valve (3), the sixth valve port of the second four-way valve (4), and the eighth valve port of the second four-way valve (4) are all connected to the suction port of the compressor (1); The third valve port of the first four-way valve (3) is connected to the first port of the refrigerant heat exchange pipeline; the fourth valve port of the first four-way valve (3) is connected to the outdoor heat exchanger and the outdoor throttling element and then connected to the first port of the indoor unit (20), and is also connected to the suction port of the compressor (1); the seventh valve port of the second four-way valve (4) is connected to the second port of the indoor unit (20); The pipeline where the second port of the refrigerant heat exchange pipeline is located is connected to the first port of the indoor unit after passing through the floor heating throttling element; The combined heating and cooling multi-split air conditioner system further includes a sub-cooler (8); wherein, The outdoor throttling element is provided on the pipeline between the outdoor heat exchanger and the sub-cooler (8), and a sub-cooling throttling element is provided on the auxiliary pipeline of the sub-cooler (8); The fourth valve port of the first four-way valve (3) is connected to the first port of the indoor unit (20) after passing through the outdoor heat exchanger, the outdoor throttling element, and the sub-cooler (8), and returns to the suction port of the compressor (1) after passing through the sub-cooling throttling element on the auxiliary pipeline of the sub-cooler (8).

2. The multi-connected air conditioner system according to claim 1, wherein The floor heating system further includes an electric auxiliary heating element; wherein, the electric auxiliary heating element is provided on the pipeline where the floor heating heat exchange pipeline is located.

3. The multi-connected air conditioner system according to claim 1, wherein Also including: A gas-liquid separator (10); wherein, The second valve port of the first four-way valve (3), the sixth valve port of the second four-way valve (4), and the eighth valve port of the second four-way valve (4) are all connected to the inlet of the gas-liquid separator (10); The fourth valve port of the first four-way valve (3) is connected to the inlet of the gas-liquid separator (10) after passing through the outdoor heat exchanger, the outdoor throttling element, and the sub-cooling throttling element on the auxiliary pipeline of the sub-cooler (8). The outlet of the gas-liquid separator (10) is communicated with the suction port of the compressor (1).

4. The multi-connected air conditioner system according to claim 1, characterized in that, It further includes: An oil separator (2); wherein, The exhaust port of the compressor (1) is communicated with the first port of the oil separator (2); the second port of the oil separator (2) is communicated with the suction port of the compressor (1); the third port of the oil separator (2) is communicated with the first valve port of the first four-way valve (3) and is also communicated with the fifth valve port of the second four-way valve (4).

5. The multi-connected air conditioner system according to claim 4, characterized in that, It further includes: A first oil return throttling element and a second oil return throttling element; wherein, The third port of the oil separator (2) is communicated with the suction port of the compressor (1) after passing through the first oil return throttling element and the second oil return throttling element connected in parallel.

6. The multi-connected air conditioner system according to claim 1, characterized in that, It further includes at least one of a high-pressure gas pipe valve (12), a gas pipe valve (13), and a liquid pipe valve (14); wherein, When the multi-connected air-conditioning system further includes the high-pressure gas pipe valve (12), the third valve port of the first four-way valve (3) is communicated with the first port of the refrigerant heat exchange pipeline after passing through the high-pressure gas pipe valve (12); When the multi-connected air-conditioning system further includes the gas pipe valve (13), the seventh valve port of the second four-way valve (4) is communicated with the second port of the indoor unit (20) after passing through the gas pipe valve (13). When the multi-connected air-conditioning system further includes the liquid pipe valve (14), the fourth valve port of the first four-way valve (3) is communicated with the first port of the indoor unit (20) after passing through the outdoor heat exchanger, the outdoor throttling element, the subcooler (8), and the liquid pipe valve (14).

7. The multi-connected air conditioner system according to claim 2, wherein It further includes: At least one of an expansion tank (30), a water flow switch (31), and a water pump (32); wherein, The first water port of the floor heating system is communicated with the first port of the floor heating heat exchange pipeline after passing through the electric heating element; the second water port of the floor heating system is communicated with the second port of the floor heating heat exchange pipeline after passing through at least one of the expansion tank (30), the water flow switch (31), and the water pump (32).

8. A control method for a multi-connected air conditioner system according to any one of claims 1 to 7, characterized in that, It includes: Obtaining the defrost flag bit of the refrigerant system in the multi-connected air-conditioning system and obtaining the floor heating water temperature of the floor heating system in the multi-connected air-conditioning system; According to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, controlling the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, and the floor heating throttling element, so that in the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan matched with the indoor unit (20), and the floor heating throttling element, during the process of defrosting the outdoor heat exchanger by the multi-connected air-conditioning system, it can absorb the energy of the floor heating system, provide heating to the indoor unit (20), and provide energy for defrosting the outdoor heat exchanger.

9. The control method of the multi-connected air conditioner system according to claim 8, wherein It further includes: When the floor heating system further includes an electric auxiliary heating element, in the case of different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan configured to match the indoor unit (20), the floor heating throttling element, and the electric auxiliary heating element, during the defrosting process of the outdoor heat exchanger by the multi-connected system, the multi-connected system can absorb the energy of the floor heating system, provide it to the indoor unit (20) for heating, and provide it to the outdoor heat exchanger for defrosting.

10. The control method of the multi-connected air conditioner system according to claim 8 or 9, characterized in that, Further included are: When the floor heating system further includes a subcooler (8), in the case of different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan configured to match the indoor unit (20), the subcooling throttling element, and the floor heating throttling element, during the defrosting process of the outdoor heat exchanger by the multi-connected system, the multi-connected system can absorb the energy of the floor heating system, provide it to the indoor unit (20) for heating, and provide it to the outdoor heat exchanger for defrosting.

11. The control method of the multi-connected air conditioner system according to claim 8 or 9, characterized in that, Controlling the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan configured to match the indoor unit (20), and the floor heating throttling element according to the defrosting flag bit of the refrigerant system and the floor heating water temperature of the floor heating system includes: Determining the current operating mode of the multi-connected system according to the defrosting flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, and controlling the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan configured to match the indoor unit (20), and the floor heating throttling element in the current operating mode of the multi-connected system; Wherein, when the multi-connected system further includes at least one of an electric auxiliary heating element and a subcooler (8), determining the current operating mode of the multi-connected system according to the defrosting flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, and controlling the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan configured to match the indoor unit (20), the subcooling throttling element, the floor heating throttling element, and the electric auxiliary heating element in the current operating mode of the multi-connected system; The current operating mode of the multi-connected system is any one of a refrigerant system single cooling mode, a refrigerant system single heating mode, a floor heating system single heating mode, and a refrigerant system and floor heating system simultaneous heating mode; Wherein, determining the current operating mode of the multi-connected system according to the defrosting flag bit of the refrigerant system and the floor heating water temperature of the floor heating system includes: If the defrosting flag bit of the refrigerant system is a set value and the floor heating water temperature of the floor heating system is greater than or equal to the first set water temperature, it is determined that the current operating mode of the multi-connected system is a refrigerant system single heating mode; If the defrost flag bit of the refrigerant system is a set value, and the floor heating water temperature of the floor heating system is greater than or equal to the second set water temperature and less than the first set water temperature, it is determined that the current operating mode of the multi-connected system is the simultaneous heating mode of the refrigerant system and the floor heating system; If the defrost flag bit of the refrigerant system is a set value, and the floor heating water temperature of the floor heating system is greater than or equal to the third set water temperature and less than the second set water temperature, it is determined that the current operating mode of the multi-connected system is the separate heating mode of the floor heating system; If the defrost flag bit of the refrigerant system is a set value, and the floor heating water temperature of the floor heating system is less than the third set water temperature, it is determined that the current operating mode of the multi-connected system is the separate cooling mode of the refrigerant system.

12. The control method of the multi-connected air conditioner system according to claim 10, characterized in that, According to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, control the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan matched with the indoor unit (20), and the floor heating throttling element, including: According to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, determine the current operating mode of the multi-connected system, and under the current operating mode of the multi-connected system, control the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan matched with the indoor unit (20), and the floor heating throttling element; Wherein, when the multi-connected system further includes at least one of an electric auxiliary heating element and a subcooler (8), according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system, determine the current operating mode of the multi-connected system, and under the current operating mode of the multi-connected system, control the different opening and closing conditions of the corresponding components in the double four-way valve system, the outdoor throttling element, the indoor throttling element, the indoor fan matched with the indoor unit (20), the subcooling throttling element, the floor heating throttling element, and the electric auxiliary heating element; The current operating mode of the multi-connected system is any one of the separate cooling mode of the refrigerant system, the separate heating mode of the refrigerant system, the separate heating mode of the floor heating system, and the simultaneous heating mode of the refrigerant system and the floor heating system; Wherein, determining the current operating mode of the multi-connected system according to the defrost flag bit of the refrigerant system and the floor heating water temperature of the floor heating system includes: If the defrost flag bit of the refrigerant system is a set value, and the floor heating water temperature of the floor heating system is greater than or equal to the first set water temperature, it is determined that the current operating mode of the multi-connected system is the separate heating mode of the refrigerant system; If the defrost flag bit of the refrigerant system is a set value, and the floor heating water temperature of the floor heating system is greater than or equal to the second set water temperature and less than the first set water temperature, it is determined that the current operating mode of the multi-connected system is the simultaneous heating mode of the refrigerant system and the floor heating system; If the defrost flag bit of the refrigerant system is a set value, and the floor heating water temperature of the floor heating system is greater than or equal to the third set water temperature and less than the second set water temperature, then it is determined that the current operating mode of the multi-split air conditioner system is the floor heating system independent heating mode; If the defrost flag bit of the refrigerant system is a set value, and the floor heating water temperature of the floor heating system is less than the third set water temperature, then it is determined that the current operating mode of the multi-split air conditioner system is the refrigerant system independent cooling mode.

13. The control method of the multi-connected air conditioner system according to claim 11, characterized in that Wherein, When defrosting in the refrigerant system independent cooling mode, the electromagnetic coils of the first four-way valve (3) and the second four-way valve (4) are not energized, the floor heating throttle element is closed, the outdoor throttle element is opened, the indoor fan is closed, and the indoor throttle element is opened but operates at an opening degree lower than the set value; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is closed; when the combined heating and cooling multi-split air conditioner system further includes a subcooler (8), the subcooling throttle element of the subcooler (8) is closed; When defrosting in the refrigerant system independent heating mode, the first four-way valve (3) is not energized, the electromagnetic coil of the second four-way valve (4) is energized, the floor heating throttle element is opened, and the outdoor throttle element is opened; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is closed; when the combined heating and cooling multi-split air conditioner system further includes a subcooler (8), the subcooling throttle element of the subcooler (8) is closed; When defrosting in the floor heating system independent heating mode, the electromagnetic coil of the first four-way valve (3) is not energized, the electromagnetic coil of the second four-way valve (4) is not energized, the floor heating throttle element is opened, the outdoor throttle element is opened, and the indoor fan is closed; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is opened; when the combined heating and cooling multi-split air conditioner system further includes a subcooler (8), the subcooling throttle element of the subcooler (8) is closed; When defrosting in the refrigerant system and floor heating system simultaneous heating mode, the first four-way valve (3) is not energized, the electromagnetic coil of the second four-way valve (4) is energized, the floor heating throttle element is opened, and the outdoor throttle element is opened; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is opened; when the combined heating and cooling multi-split air conditioner system further includes a subcooler (8), the subcooling throttle element of the subcooler (8) is closed.

14. The control method of the multi-connected air conditioner system according to claim 12, wherein Wherein, When defrosting in the refrigerant system independent cooling mode, the electromagnetic coils of the first four-way valve (3) and the second four-way valve (4) are not energized, the floor heating throttle element is closed, the outdoor throttle element is opened, the indoor fan is closed, and the indoor throttle element is opened but operates at an opening degree lower than the set value; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is closed; when the combined heating and cooling multi-split air conditioner system further includes a subcooler (8), the subcooling throttle element of the subcooler (8) is closed; When defrosting in the single heating mode of the refrigerant system, the first four-way valve (3) is de-energized, the solenoid coil of the second four-way valve (4) is energized, the floor heating throttle element is opened, and the outdoor throttle element is opened; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is turned off; when the combined heating and cooling multi-split system further includes a subcooler (8), the subcooling throttle element of the subcooler (8) is closed; When defrosting in the single heating mode of the floor heating system, the solenoid coil of the first four-way valve (3) is de-energized, the solenoid coil of the second four-way valve (4) is de-energized, the floor heating throttle element is opened, the outdoor throttle element is opened, and the indoor fan is turned off; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is turned on; when the combined heating and cooling multi-split system further includes a subcooler (8), the subcooling throttle element of the subcooler (8) is closed; When defrosting in the simultaneous heating mode of the refrigerant system and the floor heating system, the first four-way valve (3) is de-energized, the solenoid coil of the second four-way valve (4) is energized, the floor heating throttle element is opened, and the outdoor throttle element is opened; when the floor heating system further includes an electric auxiliary heating element, the electric auxiliary heating element is turned on; when the combined heating and cooling multi-split system further includes a subcooler (8), the subcooling throttle element of the subcooler (8) is closed.

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