A multi-connected air conditioner and control method thereof

Abstract

The present disclosure provides a multi-split air conditioner and a control method thereof, wherein the multi-split air conditioner comprises: a compressor unit, an outdoor heat exchanger, a first pipe, a second pipe, a third pipe and a fourth pipe, wherein the first pipe, the second pipe, the third pipe and the fourth pipe are respectively connected between the indoor unit and the outdoor unit; further comprising a first four-way valve, a second four-way valve and a third four-way valve; the second end of the first four-way valve is connected to the outdoor heat exchanger, and the other end of the outdoor heat exchanger can be connected to the first pipe; after the second pipe and the fourth pipe are connected, they are connected together to the seventh end of the second four-way valve, and the third pipe can be connected to the tenth end of the third four-way valve. According to the present disclosure, multiple modes such as cooling, heating, cooling + hot water, heating + hot water, and hot water + heating can be realized, and the problems of poor practicality of the three-pipe air conditioning control system and insufficient utilization of the efficiency of the indoor heat exchanger can be solved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of multi-split air conditioners, and in particular to a multi-split air conditioner and a control method thereof. Background Art

[0002] The modular full-function multi-split unit is a new generation of multi-split unit that integrates functions such as cooling, heating, floor heating, and hot water. It can realize multiple functions at the same time, and one machine can be used for multiple purposes. There are very few such products on the market, so there is still great development prospects. However, to achieve multi-functions, it means that it has its own complex control system, such as the series and parallel combination control of the compressor, the four-way valve, the double four-way valve control, the combination control of various valve bodies, and the control of the pipeline system, which makes the structure and control system of the unit extremely complex, and brings great difficulties to the design, development, and later maintenance of the unit. The three-pipe air conditioning control system has prominent shortcomings, and its feasibility is not great in theory and application. In actual applications, multi-split units often require frequent alternation of cold and hot conditions or require cooling and heating at the same time. There are problems such as poor system practicality and insufficient utilization of the efficiency of the internal heat exchanger.

[0003] Since the modular full-function multi-split air conditioner in the prior art adopts three-pipe air conditioning control, the system has prominent shortcomings, and there are technical problems such as poor system practicality and insufficient utilization of the efficiency of the internal heat exchanger. Therefore, the present invention studies and designs a multi-split air conditioner and its control method. Summary of the invention

[0004] Therefore, the technical problem to be solved by the present invention is to overcome the problems in the prior art where a modular full-function multi-split air conditioner adopts three-pipe air conditioning control, has prominent system shortcomings, and has the defects of poor system practicality and insufficient utilization of the efficiency of the internal heat exchanger, thereby providing a multi-split air conditioner and a control method thereof.

[0005] In order to solve the above problems, the present disclosure provides a multi-split air conditioner, which includes:

[0006] A compressor unit, an outdoor heat exchanger, a first pipe, a second pipe, a third pipe and a fourth pipe, wherein the first pipe, the second pipe, the third pipe and the fourth pipe are respectively connected between the indoor unit and the outdoor unit;

[0007] It also includes a first four-way valve, a second four-way valve and a third four-way valve, wherein the first end of the first four-way valve is connected to the fifth end of the second four-way valve and the ninth end of the third four-way valve, and is connected to the exhaust end of the compressor unit; the second end of the first four-way valve is connected to the outdoor heat exchanger, and the other end of the outdoor heat exchanger can be connected to the first pipe;

[0008] After the second pipe and the fourth pipe are connected, they are connected to the seventh end of the second four-way valve together, and the third pipe can be connected to the tenth end of the third four-way valve; and the fourth end of the first four-way valve, the eighth end of the second four-way valve, and the twelfth end of the third four-way valve are all connected, and are connected to the suction end of the compressor unit together.

[0009] In some embodiments, the third end of the first four-way valve is connected to the fourth end; the sixth end of the second four-way valve is connected to the seventh end; and the eleventh end of the third four-way valve is connected to the twelfth end.

[0010] In some embodiments, at least one indoor unit is further disposed between the first tube and the second tube, the indoor unit comprising an indoor heat exchanger and an indoor unit pipeline, and the indoor heat exchanger and the first throttling device are disposed on the indoor unit pipeline.

[0011] In some embodiments, at least one constant temperature dehumidifier indoor unit is included, and the constant temperature dehumidifier indoor unit includes a first heat exchanger and a second heat exchanger. The first heat exchanger is arranged on a third pipeline, one end of the third pipeline is connected to the first pipe, and the other end is connected to the fourth pipe, and a second throttling device is also arranged on the third pipeline. The second heat exchanger is arranged on a fourth pipeline, one end of the fourth pipeline is connected to the first pipe, and the other end is connected to the third pipe, and a third throttling device is also arranged on the fourth pipeline.

[0012] In some embodiments, at least one hot water module is further included, the hot water module includes a water tank and a fifth pipeline, the water tank is arranged on the fifth pipeline, a fourth throttling device is arranged on the fifth pipeline, one end of the fifth pipeline is connected to the first pipe, and the other end is connected to the second pipe through the sixth pipe, and the other end of the fifth pipe is also connected to the third pipe through the seventh pipe.

[0013] In some embodiments, the sixth pipeline is further provided with a first control valve, and the seventh pipeline is further provided with a second control valve; and / or the sixth pipeline is further provided with a first one-way valve that only allows fluid to flow from the fifth pipeline to the second pipeline, and the seventh pipeline is further provided with a second one-way valve that only allows fluid to flow from the third pipeline to the fifth pipeline.

[0014] In some embodiments, at least one floor heating module is further included, and the floor heating module includes a floor heating heat exchange component and an eighth pipeline. The floor heating heat exchange component is arranged on the eighth pipeline. A fifth throttling device is arranged on the eighth pipeline. One end of the eighth pipeline is connected to the first pipe, and the other end is connected to the second pipe through a ninth pipe. The other end of the eighth pipeline is also connected to the third pipe through a tenth pipe.

[0015] In some embodiments, the ninth pipeline is further provided with a third control valve, and the tenth pipeline is further provided with a fourth control valve; and / or the ninth pipeline is further provided with a third one-way valve that only allows fluid to flow from the eighth pipeline to the second pipeline, and the tenth pipeline is further provided with a fourth one-way valve that only allows fluid to flow from the third pipeline to the eighth pipeline.

[0016] In some embodiments, at least one hot water generating module is further included, the hot water generating module includes a hot water generator and an eleventh pipeline, the hot water generator is arranged on the eleventh pipeline, a sixth throttling device is arranged on the eleventh pipeline, one end of the eleventh pipeline is connected to the first pipe, and the other end is connected to the second pipe through a twelfth pipeline, and the other end of the eleventh pipeline is also connected to the third pipe through a thirteenth pipeline.

[0017] In some embodiments, the twelfth pipeline is further provided with a fifth control valve, and the thirteenth pipeline is further provided with a sixth control valve; and / or, the twelfth pipeline is further provided with a fifth one-way valve that only allows fluid to flow from the eleventh pipeline to the second pipeline, and the thirteenth pipeline is further provided with a sixth one-way valve that only allows fluid to flow from the third pipeline to the eleventh pipeline.

[0018] In some embodiments, when a first control valve and a second control valve are included, at least one of the first control valve and the second control valve is a solenoid valve; when a third control valve and a fourth control valve are included, at least one of the third control valve and the fourth control valve is a solenoid valve; when a fifth control valve and a sixth control valve are included, at least one of the fifth control valve and the sixth control valve is a solenoid valve;

[0019] And / or, a seventh throttling device is further provided between the other end of the outdoor heat exchanger and the first tube.

[0020] The present disclosure also provides a control method for a multi-split air conditioner as described in any of the preceding items, which realizes at least one mode of indoor cooling, heating, hot water production and heating by controlling the first four-way valve, the second four-way valve and the third four-way valve.

[0021] In some embodiments, when refrigeration is required, the first four-way valve is controlled so that the first end is connected to the second end, the third end is connected to the fourth end, the second four-way valve is controlled so that the fifth end is connected to the sixth end, the seventh end is connected to the eighth end, and the third four-way valve is controlled so that the ninth end is connected to the eleventh end, and the tenth end is connected to the twelfth end;

[0022] When a first throttling device is included, the first throttling device is opened; when a second throttling device is included, the second throttling device is opened; when a third throttling device is included, the third throttling device is opened.

[0023] In some embodiments, when heating is required, the first four-way valve is controlled so that the first end is connected to the third end, the second end is connected to the fourth end, the second four-way valve is controlled so that the fifth end is connected to the seventh end, the sixth end is connected to the eighth end, and the third four-way valve is controlled so that the ninth end is connected to the eleventh end, and the tenth end is connected to the twelfth end;

[0024] When a first throttling device is included, the first throttling device is opened; when a second throttling device is included, the second throttling device is opened; when a third throttling device is included, the third throttling device is closed.

[0025] In some embodiments, when heating+heating+hot water is required, the first four-way valve is controlled so that the first end is connected to the third end, the second end is connected to the fourth end, the second four-way valve is controlled so that the fifth end is connected to the seventh end, the sixth end is connected to the eighth end, and the third four-way valve is controlled so that the ninth end is connected to the tenth end, and the eleventh end is connected to the twelfth end;

[0026] When a first throttling device is included, the first throttling device is opened; when a second throttling device is included, the second throttling device is opened; when a third throttling device is included, the third throttling device is opened;

[0027] When the first control valve and the second control valve are included, the second control valve is opened; when the third control valve and the fourth control valve are included, the fourth control valve is opened; when the fifth control valve and the sixth control valve are included, the sixth control valve is opened.

[0028] In some embodiments, when constant temperature dehumidification + heating + hot water production is required, the first four-way valve is controlled so that the first end is connected to the third end, the second end is connected to the fourth end, the second four-way valve is controlled so that the fifth end is connected to the sixth end, the seventh end is connected to the eighth end, and the third four-way valve is controlled so that the ninth end is connected to the tenth end, and the eleventh end is connected to the twelfth end;

[0029] When a first throttling device is included, the first throttling device is closed; when a second throttling device is included, the second throttling device is opened; when a third throttling device is included, the third throttling device is opened;

[0030] When the first control valve and the second control valve are included, the second control valve is opened; when the third control valve and the fourth control valve are included, the fourth control valve is opened; when the fifth control valve and the sixth control valve are included, the sixth control valve is opened.

[0031] The multi-split air conditioner and control method thereof provided by the present disclosure have the following beneficial effects:

[0032] The present invention can effectively form a four-pipe system by connecting the first, second, third and fourth pipes between the internal and external units, and use four connecting pipes to replace the original three-pipe system for control, and realize the control system mode conversion by increasing the number of four-way valves; the cold and hot coils in all terminal devices in the four-pipe system work independently, and each terminal device can independently select the heating or cooling mode, and fully utilizes the efficiency of the heat exchanger of the internal unit, so that the first heat exchanger and the second heat exchanger in the constant temperature dehumidification module can effectively perform cooling and heat exchange, especially in the cooling mode (compared with the constant temperature dehumidification module in the three-pipe system). Only the first heat exchanger in the dehumidification module can perform cooling and heat exchange, and the second heat exchanger does not work), which effectively increases the heat exchange area, fully utilizes the indoor heat exchanger, improves the utilization efficiency of the indoor heat exchanger, and improves the heat exchange efficiency; solves the problems of poor practicality of the three-pipe air-conditioning control system and insufficient utilization of the efficiency of the indoor heat exchanger, can improve the adaptability to load changes, flexible adjustment, and is conducive to system maintenance and transformation, and also effectively realizes multiple modes such as cooling, heating, cooling + hot water, heating + hot water, and hot water + heating that can be achieved by the original three-pipe multi-split solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 is a system structure diagram of the multi-split air conditioner disclosed in the present invention;

[0034] Figure 2 is a system diagram of the multi-split air conditioner of the present disclosure in cooling mode;

[0035] Figure 3 is a system diagram of the multi-split air conditioner of the present disclosure in heating mode;

[0036] Figure 4 is a system diagram of the multi-split air conditioner of the present disclosure in heating + heating + hot water making mode;

[0037] Figure 5 It is a system diagram of the multi-split air conditioner disclosed in the present invention in a constant temperature dehumidification + heating + hot water making mode.

[0038] The reference numerals are:

[0039] 1. Compressor unit; 1a. Exhaust end; 1b. Suction end; 2. Outdoor heat exchanger; 31. First pipe; 32. Second pipe; 33. Third pipe; 34. Fourth pipe; 41. First four-way valve; 42. Second four-way valve; 43. Third four-way valve; D1. First end; C1. Second end; E1. Third end; S1. Fourth end; D2. Fifth end; C2. Sixth end; E2. Seventh end; S2. Eighth end; D3. Ninth end; C3 , tenth end; E3, eleventh end; S3, twelfth end; 51, first control valve; 52, second control valve; 53, third control valve; 54, fourth control valve; 55, fifth control valve; 56, sixth control valve; 57, first check valve; 58, second check valve; 59, third check valve; 510, fourth check valve; 511, fifth check valve; 512, sixth check valve; 61, indoor unit; 611, indoor heat exchanger; 6 2. Constant temperature dehumidification indoor unit; 621. First heat exchanger; 622. Second heat exchanger; 71. First throttling device; 72. Second throttling device; 73. Third throttling device; 74. Fourth throttling device; 75. Fifth throttling device; 76. Sixth throttling device; 77. Seventh throttling device; 8. Hot water module; 81. Water tank; 9. Floor heating module; 91. Floor heating heat exchange assembly; 10. Hot water generation module; 10a. Hot water generator; 1 51. The first large valve; 152. The second large valve; 153. The small valve; 154. The high-pressure gas pipe valve; 102. The indoor unit pipeline; 103. The third pipeline; 104. The fourth pipeline; 105. The fifth pipeline; 106. The sixth pipeline; 107. The seventh pipeline; 108. The eighth pipeline; 109. The ninth pipeline; 110. The tenth pipeline; 111. The eleventh pipeline; 112. The twelfth pipeline; 113. The thirteenth pipeline. DETAILED DESCRIPTION

[0040] like Figure 1-5 As shown, the present disclosure provides a multi-split air conditioner, which includes:

[0041] The compressor unit 1, the outdoor heat exchanger 2, the first pipe 31, the second pipe 32, the third pipe 33 and the fourth pipe 34, wherein the first pipe 31, the second pipe 32, the third pipe 33 and the fourth pipe 34 are respectively connected between the indoor unit and the outdoor unit;

[0042] It also includes a first four-way valve 41, a second four-way valve 42 and a third four-way valve 43, wherein the first end D1 of the first four-way valve 41 is connected to the fifth end D2 of the second four-way valve 42 and the ninth end D3 of the third four-way valve 43, and are connected to the exhaust end 1a of the compressor unit 1; the second end C1 of the first four-way valve 41 is connected to the outdoor heat exchanger 2, and the other end of the outdoor heat exchanger 2 can be connected to the first pipe 31;

[0043] After the second pipe 32 and the fourth pipe 34 are connected, they are connected together to the seventh end E2 of the second four-way valve 42, and the third pipe 33 can be connected to the tenth end C3 of the third four-way valve 43; and the fourth end S1 of the first four-way valve 41, the eighth end S2 of the second four-way valve 42, and the twelfth end S3 of the third four-way valve 43 are all connected, and are connected together to the suction end 1b of the compressor unit 1.

[0044] The present invention can effectively form a four-pipe system by connecting the first, second, third and fourth pipes between the internal and external units, and use four connecting pipes to replace the original three-pipe system for control, and realize the control system mode conversion by increasing the number of four-way valves; the cold and hot coils in all terminal devices in the four-pipe system work independently, and each terminal device can independently select the heating or cooling mode, and fully utilizes the efficiency of the heat exchanger of the internal unit, so that the first heat exchanger and the second heat exchanger in the constant temperature dehumidification module can effectively perform cooling and heat exchange, especially in the cooling mode (compared with the constant temperature dehumidification module in the three-pipe system). Only the first heat exchanger in the dehumidification module can perform cooling and heat exchange, and the second heat exchanger does not work), which effectively increases the heat exchange area, fully utilizes the indoor heat exchanger, improves the utilization efficiency of the indoor heat exchanger, and improves the heat exchange efficiency; solves the problems of poor practicality of the three-pipe air-conditioning control system and insufficient utilization of the efficiency of the indoor heat exchanger, can improve the adaptability to load changes, flexible adjustment, and is conducive to system maintenance and transformation, and also effectively realizes multiple modes such as cooling, heating, cooling + hot water, heating + hot water, and hot water + heating that can be achieved by the original three-pipe multi-split solution.

[0045] The external unit of the system mainly includes: compressor (can be one or more), 3 four-way valves, 1 external unit heat exchanger, 1 electronic expansion valve, fan, etc.;

[0046] The indoor units of the system can be divided into two types, one is a single heat exchanger indoor unit, which includes 1 heat exchanger, 1 electronic expansion valve, fan, etc.; the other is a double heat exchanger indoor unit (i.e. constant temperature dehumidification indoor unit), which includes 2 heat exchangers, 2 electronic expansion valves, fan, etc.

[0047] The hot water module of the system includes: 4 solenoid valves (control valves), 4 one-way valves, water tank, and 2 electronic expansion valves;

[0048] The floor heating module of the system includes: 1 (or more) sets of floor heating coil heat exchange terminals, 1 (or more) electronic expansion valves, 2 (or more) solenoid valves, and 2 (or more) one-way valves.

[0049] In some embodiments, the third end E1 of the first four-way valve 41 is connected to the fourth end S1; the sixth end C2 of the second four-way valve 42 is connected to the seventh end E2; and the eleventh end E3 of the third four-way valve 43 is connected to the twelfth end S3. This is a further preferred communication mode between the four ends of each of the three four-way valves disclosed in the present invention, which effectively cooperates with the four pipes to complete the control of at least one of the modes of cooling, heating, hot water and heating, and the effective combination of the modes.

[0050] In some embodiments, at least one indoor unit 61 is further provided between the first tube 31 and the second tube 32, and the indoor unit 61 includes an indoor heat exchanger 611 and an indoor unit pipeline 102, and the indoor heat exchanger 611 and a first throttling device 71 are provided on the indoor unit pipeline 102. The indoor unit provided by the present disclosure is connected between the second gas side tube and the liquid side tube, and the indoor unit includes an indoor heat exchanger, an indoor unit pipeline and a first throttling device, so that the multi-split system can introduce the refrigerant into the indoor heat exchanger of the indoor unit for cooling or heating, and perform effective throttling and pressure reduction through the first throttling device.

[0051] In some embodiments, at least one constant temperature dehumidifier indoor unit 62 is further included, and the constant temperature dehumidifier indoor unit 62 includes a first heat exchanger 621 and a second heat exchanger 622. The first heat exchanger 621 is arranged on the third pipeline 103, one end of the third pipeline 103 is connected to the first tube 31, and the other end is connected to the fourth tube 34, and the third pipeline 103 is also provided with a second throttling device 72, the second heat exchanger 622 is arranged on the fourth pipeline 104, one end of the fourth pipeline 104 is connected to the first tube 31, and the other end is connected to the third tube 33, and the fourth pipeline 104 is also provided with a third throttling device 73. The present disclosure also sets a constant temperature dehumidification indoor unit, which includes a first and a second heat exchanger, and the first heat exchanger is connected between the second gas side pipe and the liquid side pipe. The first heat exchanger can cool the air by performing evaporation, and the second heat exchanger is set between the first gas side pipe and the liquid side pipe. The second heat exchanger can condense and release heat to heat the air. Finally, the air is first cooled and dehumidified by the first heat exchanger, and then heated by the second heat exchanger, thereby achieving the effect of constant temperature dehumidification of the air.

[0052] In some embodiments, at least one hot water module 8 is further included, and the hot water module 8 includes a water tank 81 and a fifth pipeline 105, the water tank 81 is arranged on the fifth pipeline 105, the fifth pipeline 105 is provided with a fourth throttling device 74, and one end of the fifth pipeline 105 is connected to the first pipe 31, and the other end is connected to the second pipe 32 through the sixth pipeline 106, and the other end of the fifth pipeline 105 is also connected to the third pipe 33 through the seventh pipeline 107. The present disclosure sets a hot water module, and enables the water tank to be connected between the first pipe and the second pipe, and the refrigerant between the first pipe and the second pipe flows through the water tank to heat the water to produce hot water, and then connects between the first pipe and the third pipe through the water tank, and the refrigerant between the first pipe and the third pipe flows through the water tank to heat the water to produce hot water.

[0053] In some embodiments, the sixth pipeline 106 is further provided with a first control valve 51, and the seventh pipeline 107 is further provided with a second control valve 52; and / or, the sixth pipeline 106 is further provided with a first check valve 57 that only allows fluid to flow from the fifth pipeline 105 to the second pipe 32, and the seventh pipeline 107 is further provided with a second check valve 58 that only allows fluid to flow from the third pipe 33 to the fifth pipeline 105. The present disclosure can also control whether the water tank is connected to the first pipe and the second pipe through the first control valve provided on the sixth pipeline, and can control whether the water tank is connected to the first pipe and the third pipe through the second control valve provided on the seventh pipeline; the first check valve provided on the sixth pipeline allows the fluid to flow only from the first pipe, the fifth pipe to the sixth pipe to the second pipe, and the second check valve provided on the seventh pipeline allows the fluid to flow only from the third pipe, the seventh pipe to the fifth pipe to the first pipe, so that the high-temperature refrigerant always flows through the water tank to heat the water to produce hot water.

[0054] In some embodiments, at least one floor heating module 9 is further included, and the floor heating module 9 includes a floor heating heat exchange component 91 and an eighth pipeline 108. The floor heating heat exchange component 91 is arranged on the eighth pipeline 108, and the eighth pipeline 108 is provided with a fifth throttling device 75, and one end of the eighth pipeline 108 is connected to the first pipe 31, and the other end is connected to the second pipe 32 through the ninth pipeline 109, and the other end of the eighth pipeline 108 is also connected to the third pipe 33 through the tenth pipeline 110. The present disclosure uses the floor heating module, and through the arrangement of the floor heating heat exchange component and the eighth pipeline, the floor heating heat exchange component is connected between the first pipe and the second pipe, or between the first pipe and the third pipe, so as to use the refrigerant to effectively heat the floor heating heat exchange component to achieve the heating effect.

[0055] In some embodiments, the ninth pipeline 109 is further provided with a third control valve 53, and the tenth pipeline 110 is further provided with a fourth control valve 54; and / or, the ninth pipeline 109 is further provided with a third check valve 59 that only allows fluid to flow from the eighth pipeline 108 to the second pipe 32, and the tenth pipeline 110 is further provided with a fourth check valve 510 that only allows fluid to flow from the third pipe 33 to the eighth pipeline 108. The present disclosure can also control whether the floor heating heat exchange assembly is connected to the first pipe and the second pipe through the third control valve provided on the ninth pipeline, and control whether the water tank is connected to the first pipe and the third pipe through the fourth control valve provided on the tenth pipeline; the third check valve provided on the ninth pipeline allows the fluid to flow only from the first pipe, the eighth pipe to the ninth pipe to the second pipe, and the fourth check valve provided on the tenth pipeline allows the fluid to flow only from the third pipe, the tenth pipe to the eighth pipe to the first pipe, so as to achieve that the high-temperature refrigerant always flows through the floor heating heat exchange assembly to heat the room.

[0056] In some embodiments, at least one hot water generation module 10 is further included, the hot water generation module 10 includes a hot water generator 10a and an eleventh pipeline 111, the hot water generator 10a is arranged on the eleventh pipeline 111, the eleventh pipeline 111 is provided with a sixth throttling device 76, and one end of the eleventh pipeline 111 is connected to the first pipe 31, and the other end is connected to the second pipe 32 through the twelfth pipeline 112, and the other end of the eleventh pipeline 111 is also connected to the third pipe 33 through the thirteenth pipeline 113. The present disclosure sets a hot water generation module, and enables the hot water generator to be connected between the first pipe and the second pipe, and the refrigerant between the first pipe and the second pipe flows through the water tank to heat the water to produce hot water, and then connects between the first pipe and the third pipe through the hot water generator, and the refrigerant between the first pipe and the third pipe flows through the hot water generator to heat the water to produce hot water.

[0057] In some embodiments, the twelfth pipeline 112 is further provided with a fifth control valve 55, and the thirteenth pipeline 113 is further provided with a sixth control valve 56; and / or, the twelfth pipeline 112 is further provided with a fifth one-way valve 511 that only allows fluid to flow from the eleventh pipeline 111 to the second pipe 32, and the thirteenth pipeline 113 is further provided with a sixth one-way valve 512 that only allows fluid to flow from the third pipe 33 to the eleventh pipeline 111. The present disclosure can also control whether the hot water generator is connected to the first pipe and the second pipe through the fifth control valve arranged on the twelfth pipeline, and can control whether the hot water generator is connected to the first pipe and the third pipe through the sixth control valve arranged on the thirteenth pipeline; the fifth one-way valve arranged on the twelfth pipeline allows the fluid to flow only from the first pipe and the eleventh pipeline to the second pipe in the direction of the twelfth pipeline, and the sixth one-way valve arranged on the thirteenth pipeline allows the fluid to flow only from the third pipe and the thirteenth pipeline to the eleventh pipeline to the first pipe, so as to achieve that high-temperature refrigerant always flows through the hot water generator to heat the water to produce hot water.

[0058] In some embodiments, when a first control valve 51 and a second control valve 52 are included, at least one of the first control valve 51 and the second control valve 52 is a solenoid valve; when a third control valve 53 and a fourth control valve 54 are included, at least one of the third control valve 53 and the fourth control valve 54 is a solenoid valve; when a fifth control valve 55 and a sixth control valve 56 are included, at least one of the fifth control valve 55 and the sixth control valve 56 is a solenoid valve;

[0059] And / or, a seventh throttling device 77 is further provided between the other end of the outdoor heat exchanger 2 and the first tube 31 .

[0060] The control valve is preferably a solenoid valve, which can provide more space and better solutions for the design of the unit's piping system. Moreover, since the air tightness of the solenoid valve itself is better than that of a four-way valve, the air tightness of the system can also be improved to a certain extent.

[0061] The present disclosure also provides a control method for a multi-split air conditioner as described in any of the preceding items, which realizes at least one of indoor cooling, heating, hot water production and heating modes by controlling the first four-way valve 41, the second four-way valve 42 and the third four-way valve 43.

[0062] The present invention can effectively form a four-pipe system by connecting the first, second, third and fourth pipes between the internal and external units, and use four connecting pipes to replace the original three-pipe system for control, and realize the control system mode conversion by increasing the number of four-way valves; the cold and hot coils in all terminal devices in the four-pipe system work independently, and each terminal device can independently select the heating or cooling mode, and fully utilizes the efficiency of the heat exchanger of the internal unit, so that the first heat exchanger and the second heat exchanger in the constant temperature dehumidification module can effectively perform cooling and heat exchange, especially in the cooling mode (compared with the constant temperature dehumidification module in the three-pipe system). Only the first heat exchanger in the dehumidification module can perform cooling and heat exchange, and the second heat exchanger does not work), which effectively increases the heat exchange area, fully utilizes the indoor heat exchanger, improves the utilization efficiency of the indoor heat exchanger, and improves the heat exchange efficiency; solves the problems of poor practicality of the three-pipe air-conditioning control system and insufficient utilization of the efficiency of the indoor heat exchanger, can improve the adaptability to load changes, flexible adjustment, and is conducive to system maintenance and transformation, and also effectively realizes multiple modes such as cooling, heating, cooling + hot water, heating + hot water, and hot water + heating that can be achieved by the original three-pipe multi-split solution.

[0063] In some embodiments, when refrigeration is required, the first four-way valve 41 is controlled so that the first end D1 is connected to the second end C1, the third end E1 is connected to the fourth end S1, the second four-way valve 42 is controlled so that the fifth end D2 is connected to the sixth end C2, the seventh end E2 is connected to the eighth end S2, and the third four-way valve 43 is controlled so that the ninth end D3 is connected to the eleventh end E3, and the tenth end C3 is connected to the twelfth end S3;

[0064] When the first throttling device 71 is included, the first throttling device 71 is opened; when the second throttling device 72 is included, the second throttling device 72 is opened; when the third throttling device 73 is included, the third throttling device 73 is opened.

[0065] When the system is cooling, Figure 2 As shown. The exhaust gas of the compressor enters the outdoor heat exchanger 2 through the first four-way valve 41 with the electromagnetic coil powered off, releases heat in the condenser of the outdoor heat exchanger, flows through the seventh throttling device 77 (preferably an electronic expansion valve) in the fully open state, and the small valve 153, enters the indoor unit, and enters the indoor heat exchanger (ordinary indoor unit and constant temperature dehumidification indoor unit) after throttling by the first throttling device 71. After the refrigerant evaporates and absorbs heat, it passes through the first large valve 151 and enters the second four-way valve 42 and the third four-way valve 43 with the electromagnetic coil powered on, and finally returns to the compressor. A refrigeration cycle is completed. At this time, the first to sixth control valves are all in the closed state, and the hot water and floor heating modules are in the closed state.

[0066] In some embodiments, when heating is required, the first four-way valve 41 is controlled so that the first end D1 is connected to the third end E1, the second end C1 is connected to the fourth end S1, the second four-way valve 42 is controlled so that the fifth end D2 is connected to the seventh end E2, the sixth end C2 is connected to the eighth end S2, and the third four-way valve 43 is controlled so that the ninth end D3 is connected to the eleventh end E3, and the tenth end C3 is connected to the twelfth end S3;

[0067] When the first throttling device 71 is included, the first throttling device 71 is opened; when the second throttling device 72 is included, the second throttling device 72 is opened; when the third throttling device 73 is included, the third throttling device 73 is closed.

[0068] When the system is heating, Figure 3 As shown. The exhaust gas from the compressor enters the indoor unit (ordinary indoor unit and constant temperature dehumidification indoor unit) through the second four-way valve 42 with the electromagnetic coil powered off, condenses and releases heat in the indoor unit heat exchanger, enters the outdoor unit (outdoor unit heat exchanger, etc.) after throttling by the first throttling device 71, and returns to the compressor through the first four-way valve 41 with the electromagnetic coil powered on, and the third four-way valve 43, completing a heating cycle. At this time, the first to sixth control valves are all in the closed state, and the hot water and floor heating modules are in the closed state.

[0069] In some embodiments, when heating+heating+hot water is required, the first four-way valve 41 is controlled so that the first end D1 is connected to the third end E1, the second end C1 is connected to the fourth end S1, the second four-way valve 42 is controlled so that the fifth end D2 is connected to the seventh end E2, the sixth end C2 is connected to the eighth end S2, and the third four-way valve 43 is controlled so that the ninth end D3 is connected to the tenth end C3, and the eleventh end E3 is connected to the twelfth end S3;

[0070] When the first throttling device 71 is included, the first throttling device 71 is opened; when the second throttling device 72 is included, the second throttling device 72 is opened; when the third throttling device 73 is included, the third throttling device 73 is opened;

[0071] When the first control valve 51 and the second control valve 52 are included, the second control valve 52 is opened; when the third control valve 53 and the fourth control valve 54 are included, the fourth control valve 54 is opened; when the fifth control valve 55 and the sixth control valve 56 are included, the sixth control valve 56 is opened.

[0072] When the system is heating + floor heating + hot water, Figure 4As shown. A water tank flow path and a floor heating module are added on the basis of the system heating mode flow path. The compressor exhaust passes through the second four-way valve 42 energized by the electromagnetic coil and the third four-way valve 43 that is de-energized, through the opened first large valve 151, the second large valve 152, and the high-pressure air pipe valve 154 and at least one of the first to sixth control valves, and then enters the hot water module / floor heating module (ordinary indoor unit, constant temperature dehumidification indoor unit, floor heating and water tank, which can be combined with one or more indoor units) respectively, and after heat exchange in the module, enters the outdoor unit through the small valve 153 and the seventh throttling device 77, passes through the first four-way valve 41 energized by the electromagnetic coil, and finally returns to the compressor, completing a cycle of heating + floor heating + hot water.

[0073] In some embodiments, when constant temperature dehumidification+heating+hot water production is required, the first four-way valve 41 is controlled so that the first end D1 is connected to the third end E1, the second end C1 is connected to the fourth end S1, the second four-way valve 42 is controlled so that the fifth end D2 is connected to the sixth end C2, the seventh end E2 is connected to the eighth end S2, and the third four-way valve 43 is controlled so that the ninth end D3 is connected to the tenth end C3, and the eleventh end E3 is connected to the twelfth end S3;

[0074] When the first throttling device 71 is included, the first throttling device 71 is closed; when the second throttling device 72 is included, the second throttling device 72 is opened; when the third throttling device 73 is included, the third throttling device 73 is opened;

[0075] When the first control valve 51 and the second control valve 52 are included, the second control valve 52 is opened; when the third control valve 53 and the fourth control valve 54 are included, the fourth control valve 54 is opened; when the fifth control valve 55 and the sixth control valve 56 are included, the sixth control valve 56 is opened.

[0076] When the system is in constant temperature dehumidification + floor heating + hot water production mode, Figure 5As shown. The compressor exhaust passes through the third four-way valve 43 with the electromagnetic coil de-energized and the high-pressure gas pipe valve, and enters the floor heating module, the hot water module and the indoor unit heat exchanger through at least one of the opened first to sixth control valves for corresponding heat exchange, and then enters the outdoor unit through the small valve 153 and the seventh throttling device 77, and finally returns to the compressor to complete a whole cycle. In the relatively humid transition season in the southern region, the upper limit of the indoor relative humidity can be controlled through the dehumidification and reheating function of the air-conditioning system to obtain better indoor air quality. At this time, the second throttling device 72 and the third throttling device 73 of the constant temperature dehumidifier indoor unit are both opened. After the high-pressure gas is condensed through the second heat exchanger 622 of the constant temperature dehumidifier indoor unit, it passes through the third throttling device 73, and then merges with the gas-liquid mixture condensed by other modules, and then enters the first heat exchanger 621 for evaporation, and then enters the low-pressure pipeline of the second four-way valve 42 with the electromagnetic coil de-energized through the second large valve 152, and then returns to the compressor. At this time, the air passing through the constant temperature dehumidifier indoor unit is first cooled and dehumidified in the dehumidification heat exchanger to remove moisture from the air, and then heated to the original temperature in the heating heat exchanger, thus achieving dehumidification without cooling.

[0077] The above is only a preferred embodiment of the present disclosure and is not intended to limit the present disclosure. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present disclosure shall be included in the protection scope of the present disclosure. The above is only a preferred implementation of the present disclosure. It should be pointed out that for ordinary technicians in this technical field, several improvements and variations can be made without departing from the technical principles of the present disclosure, and these improvements and variations should also be regarded as the protection scope of the present disclosure.

Claims

1. A multi-split air conditioner, characterized in that: include: A compressor unit (1), an outdoor heat exchanger (2), a first pipe (31), a second pipe (32), a third pipe (33), and a fourth pipe (34), wherein the first pipe (31), the second pipe (32), the third pipe (33), and the fourth pipe (34) are respectively connected between the indoor unit and the outdoor unit; It also comprises a first four-way valve (41), a second four-way valve (42) and a third four-way valve (43), wherein the first end (D1) of the first four-way valve (41), the fifth end (D2) of the second four-way valve (42), and the ninth end (D3) of the third four-way valve (43) are all in communication with each other and are connected to the exhaust end (1a) of the compressor unit (1); the second end (C1) of the first four-way valve (41) is in communication with the outdoor heat exchanger (2), and the other end of the outdoor heat exchanger (2) can be in communication with the first pipe (31); The second pipe (32) and the fourth pipe (34) are connected and are connected to the seventh end (E2) of the second four-way valve (42), and the third pipe (33) can be connected to the tenth end (C3) of the third four-way valve (43); and the fourth end (S1) of the first four-way valve (41), the eighth end (S2) of the second four-way valve (42), and the twelfth end (S3) of the third four-way valve (43) are all connected and are connected to the suction end (1b) of the compressor unit (1).

2. The multi-split air conditioner according to claim 1, characterized in that: The third end (E1) of the first four-way valve (41) is connected to the fourth end (S1); the sixth end (C2) of the second four-way valve (42) is connected to the seventh end (E2); and the eleventh end (E3) of the third four-way valve (43) is connected to the twelfth end (S3).

3. The multi-split air conditioner according to claim 1, characterized in that: At least one indoor unit (61) is also arranged between the first tube (31) and the second tube (32); the indoor unit (61) comprises an indoor heat exchanger (611) and an indoor unit pipeline (102); and the indoor heat exchanger (611) and a first throttling device (71) are arranged on the indoor unit pipeline (102).

4. The multi-split air conditioner according to claim 1, characterized in that: The invention also comprises at least one constant temperature dehumidification indoor unit (62), the constant temperature dehumidification indoor unit (62) comprising a first heat exchanger (621) and a second heat exchanger (622), the first heat exchanger (621) being arranged on a third pipeline (103), one end of the third pipeline (103) being connected to the first pipe (31) and the other end being connected to the fourth pipe (34), the third pipeline (103) being further provided with a second throttling device (72), the second heat exchanger (622) being arranged on a fourth pipeline (104), one end of the fourth pipeline (104) being connected to the first pipe (31) and the other end being connected to the third pipe (33), the fourth pipeline (104) being further provided with a third throttling device (73).

5. The multi-split air conditioner according to claim 1, characterized in that: The invention also comprises at least one hot water module (8), the hot water module (8) comprising a water tank (81) and a fifth pipeline (105), the water tank (81) being arranged on the fifth pipeline (105), the fifth pipeline (105) being provided with a fourth throttling device (74), one end of the fifth pipeline (105) being connected to the first pipe (31), the other end of the fifth pipeline (105) being connected to the second pipe (32) via a sixth pipeline (106), and the other end of the fifth pipeline (105) being connected to the third pipe (33) via a seventh pipeline (107).

6. The multi-split air conditioner according to claim 5, characterized in that: The sixth pipeline (106) is further provided with a first control valve (51), and the seventh pipeline (107) is further provided with a second control valve (52); and / or the sixth pipeline (106) is further provided with a first one-way valve (57) that only allows fluid to flow from the fifth pipeline (105) to the second pipe (32), and the seventh pipeline (107) is further provided with a second one-way valve (58) that only allows fluid to flow from the third pipe (33) to the fifth pipeline (105).

7. The multi-split air conditioner according to claim 1, characterized in that: The invention also comprises at least one floor heating module (9), the floor heating module (9) comprising a floor heating heat exchange component (91) and an eighth pipeline (108), the floor heating heat exchange component (91) being arranged on the eighth pipeline (108), the eighth pipeline (108) being provided with a fifth throttling device (75), one end of the eighth pipeline (108) being connected to the first pipe (31), and the other end being connected to the second pipe (32) via a ninth pipeline (109), and the other end of the eighth pipeline (108) being connected to the third pipe (33) via a tenth pipeline (110).

8. The multi-split air conditioner according to claim 7, characterized in that: The ninth pipeline (109) is further provided with a third control valve (53), and the tenth pipeline (110) is further provided with a fourth control valve (54); and / or the ninth pipeline (109) is further provided with a third one-way valve (59) that only allows fluid to flow from the eighth pipeline (108) to the second pipeline (32), and the tenth pipeline (110) is further provided with a fourth one-way valve (510) that only allows fluid to flow from the third pipeline (33) to the eighth pipeline (108).

9. The multi-split air conditioner according to claim 1, characterized in that: The invention also comprises at least one hot water generating module (10), the hot water generating module (10) comprising a hot water generator (10a) and an eleventh pipeline (111), the hot water generator (10a) being arranged on the eleventh pipeline (111), the eleventh pipeline (111) being provided with a sixth throttling device (76), one end of the eleventh pipeline (111) being connected to the first pipe (31), the other end of the eleventh pipeline (111) being connected to the second pipe (32) via a twelfth pipeline (112), and the other end of the eleventh pipeline (111) being connected to the third pipe (33) via a thirteenth pipeline (113).

10. The multi-split air conditioner according to claim 9, characterized in that: The twelfth pipeline (112) is further provided with a fifth control valve (55), and the thirteenth pipeline (113) is further provided with a sixth control valve (56); and / or the twelfth pipeline (112) is further provided with a fifth one-way valve (511) that only allows fluid to flow from the eleventh pipeline (111) to the second pipe (32), and the thirteenth pipeline (113) is further provided with a sixth one-way valve (512) that only allows fluid to flow from the third pipe (33) to the eleventh pipeline (111).

11. The multi-split air conditioner according to any one of claims 1 to 10, characterized in that: When a first control valve (51) and a second control valve (52) are included, at least one of the first control valve (51) and the second control valve (52) is a solenoid valve; when a third control valve (53) and a fourth control valve (54) are included, at least one of the third control valve (53) and the fourth control valve (54) is a solenoid valve; when a fifth control valve (55) and a sixth control valve (56) are included, at least one of the fifth control valve (55) and the sixth control valve (56) is a solenoid valve; And / or, a seventh throttling device (77) is further provided between the other end of the outdoor heat exchanger (2) and the first tube (31).

12. A control method for a multi-split air conditioner according to any one of claims 1 to 11, characterized in that: By controlling the first four-way valve (41), the second four-way valve (42) and the third four-way valve (43), at least one of indoor cooling, heating, hot water production and heating is achieved.

13. The control method of a multi-split air conditioner according to claim 12, characterized in that: The third end (E1) of the first four-way valve (41) is connected to the fourth end (S1); the sixth end (C2) of the second four-way valve (42) is connected to the seventh end (E2); and the eleventh end (E3) of the third four-way valve (43) is connected to the twelfth end (S3); When refrigeration is required, the first four-way valve (41) is controlled so that the first end (D1) and the second end (C1) are connected, and the third end (E1) and the fourth end (S1) are connected; the second four-way valve (42) is controlled so that the fifth end (D2) and the sixth end (C2) are connected, and the seventh end (E2) and the eighth end (S2) are connected; the third four-way valve (43) is controlled so that the ninth end (D3) and the eleventh end (E3) are connected, and the tenth end (C3) and the twelfth end (S3) are connected; When a first throttling device (71) is included, the first throttling device (71) is opened; when a second throttling device (72) is included, the second throttling device (72) is opened; when a third throttling device (73) is included, the third throttling device (73) is opened.

14. The control method of a multi-split air conditioner according to claim 12, characterized in that: The third end (E1) of the first four-way valve (41) is connected to the fourth end (S1); the sixth end (C2) of the second four-way valve (42) is connected to the seventh end (E2); and the eleventh end (E3) of the third four-way valve (43) is connected to the twelfth end (S3); When heating is required, the first four-way valve (41) is controlled so that the first end (D1) is connected to the third end (E1), and the second end (C1) is connected to the fourth end (S1); the second four-way valve (42) is controlled so that the fifth end (D2) is connected to the seventh end (E2), and the sixth end (C2) is connected to the eighth end (S2); the third four-way valve (43) is controlled so that the ninth end (D3) is connected to the eleventh end (E3), and the tenth end (C3) is connected to the twelfth end (S3); When a first throttling device (71) is included, the first throttling device (71) is opened; when a second throttling device (72) is included, the second throttling device (72) is opened; and when a third throttling device (73) is included, the third throttling device (73) is closed.

15. The control method of a multi-split air conditioner according to claim 12, characterized in that: The third end (E1) of the first four-way valve (41) is connected to the fourth end (S1); the sixth end (C2) of the second four-way valve (42) is connected to the seventh end (E2); and the eleventh end (E3) of the third four-way valve (43) is connected to the twelfth end (S3); When heating+heating+hot water production is required, the first four-way valve (41) is controlled so that the first end (D1) and the third end (E1) are connected, and the second end (C1) and the fourth end (S1) are connected, the second four-way valve (42) is controlled so that the fifth end (D2) and the seventh end (E2) are connected, and the sixth end (C2) and the eighth end (S2) are connected, and the third four-way valve (43) is controlled so that the ninth end (D3) and the tenth end (C3) are connected, and the eleventh end (E3) and the twelfth end (S3) are connected; When a first throttling device (71) is included, the first throttling device (71) is opened; when a second throttling device (72) is included, the second throttling device (72) is opened; when a third throttling device (73) is included, the third throttling device (73) is opened; When the first control valve (51) and the second control valve (52) are included, the second control valve (52) is opened; when the third control valve (53) and the fourth control valve (54) are included, the fourth control valve (54) is opened; when the fifth control valve (55) and the sixth control valve (56) are included, the sixth control valve (56) is opened.

16. The control method of a multi-split air conditioner according to claim 12, characterized in that: The third end (E1) of the first four-way valve (41) is connected to the fourth end (S1); the sixth end (C2) of the second four-way valve (42) is connected to the seventh end (E2); and the eleventh end (E3) of the third four-way valve (43) is connected to the twelfth end (S3); When constant temperature dehumidification+heating+hot water production is required, the first four-way valve (41) is controlled so that the first end (D1) and the third end (E1) are connected, and the second end (C1) and the fourth end (S1) are connected, the second four-way valve (42) is controlled so that the fifth end (D2) and the sixth end (C2) are connected, and the seventh end (E2) and the eighth end (S2) are connected, and the third four-way valve (43) is controlled so that the ninth end (D3) and the tenth end (C3) are connected, and the eleventh end (E3) and the twelfth end (S3) are connected; When a first throttling device (71) is included, the first throttling device (71) is closed; when a second throttling device (72) is included, the second throttling device (72) is opened; when a third throttling device (73) is included, the third throttling device (73) is opened; When the first control valve (51) and the second control valve (52) are included, the second control valve (52) is opened; when the third control valve (53) and the fourth control valve (54) are included, the fourth control valve (54) is opened; when the fifth control valve (55) and the sixth control valve (56) are included, the sixth control valve (56) is opened.

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