CN112539455A - Multi-split air conditioner and control method thereof - Google Patents

Abstract

The present disclosure provides a multi-split air conditioner and a control method thereof, the multi-split air conditioner including: the air conditioner comprises a compressor unit, an outdoor heat exchanger, a first air side pipe, a second air side pipe and a liquid side pipe, wherein the first air side pipe is communicated with an exhaust end of the compressor unit; the compressor further comprises a four-way valve, a first control valve and a second control valve, wherein the first end of the four-way valve is communicated with the first gas side pipe, the second end of the four-way valve is communicated with the outdoor heat exchanger, and the third end and the fourth end of the four-way valve are communicated with a gas suction end of the compressor unit; the first control valve is arranged on the second air side pipe, and one end of the second air side pipe is also communicated to the air suction end of the compressor unit; the second control valve is arranged on the first branch, one end of the first branch is communicated to the first gas side pipe, and the other end of the first branch is communicated to the second gas side pipe. According to the air-conditioning system, a larger space can be provided for the design of a unit pipeline system under the multiple modes of refrigeration, heating, refrigeration + hot water production, heating + hot water production, hot water production + heating and the like, the air tightness of the system is improved, and the cost is low.

Description

Multi-split air conditioner and control method thereof

Technical Field

The disclosure relates to the technical field of multi-split air conditioners, in particular to a multi-split air conditioner and a control method thereof.

Background

The modularized full-function multi-split air conditioner is a new generation multi-split air conditioner integrating the functions of refrigeration, heating, floor heating, water heating and the like. The multifunctional electric heating cooker can realize multiple functions at the same time, has multiple functions, and has very few products in the current market, thereby having great development prospect. However, to realize multiple functions, it means that the system itself has a complex control system, such as serial-parallel combination control of compressors, four-way valves, dual four-way valve control, combination control of various valve bodies, and pipeline system control, which all make the structure and control system of the unit extremely complex, and bring great difficulty to design development and later maintenance of the unit. The dual four-way valve structure provides a necessary and important mode switching function for the modular multifunctional multi-split air conditioner, and is an essential loop in a control system. However, the double four-way structure has large volume, occupies more space of the unit, brings great inconvenience for pipeline design of the unit and the like, and is very easy to cause the problems of air leakage and air leakage of the system.

Because the modular full-function multi-split air conditioner in the prior art usually adopts a double four-way valve structure to realize the mode switching function and control, but the double four-way valve structure has large volume and occupies more unit space, brings inconvenience for the pipeline design of the unit and the like, and is easy to cause the technical problems of air leakage and air leakage of the system and the like, the multi-split air conditioner and the control method thereof are researched and designed in the disclosure.

Disclosure of Invention

Therefore, the technical problem to be solved by the present disclosure is to overcome the defects that a modular full-function multi-split air conditioner in the prior art usually adopts a dual four-way valve structure to realize mode switching function and control, but the dual four-way valve structure has a large volume, occupies a large unit space, and is very easy to cause system air leakage and air leakage, so as to provide a multi-split air conditioner and a control method thereof.

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

the system comprises a compressor unit, an outdoor heat exchanger, a first gas side pipe, a second gas side pipe and a liquid side pipe, wherein the first gas side pipe is communicated with the exhaust end of the compressor unit;

the compressor unit also comprises a four-way valve, a first control valve and a second control valve, wherein the first end of the four-way valve is communicated with the first gas side pipe, the second end of the four-way valve is communicated with the outdoor heat exchanger, and the third end and the fourth end of the four-way valve are communicated with a gas suction end of the compressor unit;

the first control valve is arranged on the second air side pipe, and one end of the second air side pipe is also communicated to the air suction end of the compressor unit; the second control valve is arranged on a first branch, one end of the first branch is communicated to the first gas side pipe, and the other end of the first branch is communicated to the second gas side pipe.

In some embodiments, the four-way valve is switchable between a first state in which the first terminal is in communication with the second terminal while the third terminal is in communication with the fourth terminal, and a second state in which the first terminal is in communication with the third terminal while the second terminal is in communication with the fourth terminal.

In some embodiments, at least one indoor unit is further disposed between the second air side pipe and the liquid side pipe, the indoor unit includes an indoor heat exchanger and an indoor unit pipeline, and the indoor unit pipeline is provided with the indoor heat exchanger and a first throttling device.

In some embodiments, the constant-temperature dehumidification internal machine further comprises at least one constant-temperature dehumidification internal machine, the constant-temperature dehumidification internal machine comprises a first heat exchanger and a second heat exchanger, the first heat exchanger is arranged on the third pipeline, one end of the third pipeline is communicated to the second air side pipe, the other end of the third pipeline is communicated to the liquid side pipe, a second throttling device is further arranged on the third pipeline, the second heat exchanger is arranged on the fourth pipeline, one end of the fourth pipeline is communicated to the first air side pipe, the other end of the fourth pipeline is communicated to the liquid side pipe, and a third throttling device is further arranged on the fourth pipeline.

In some embodiments, the water tank is arranged on the fifth pipeline, the fifth pipeline is provided with a fourth throttling device, one end of the fifth pipeline is communicated to the liquid side pipe, the other end of the fifth pipeline is communicated to the first air side pipe through a sixth pipeline, and the other end of the fifth pipeline is further communicated to the second air side pipe through a seventh pipeline.

In some embodiments, a third control valve is further disposed on the sixth pipeline, and a fourth control valve is further disposed on the seventh pipeline.

In some embodiments, the floor heating module further comprises at least one floor heating module, the floor heating module comprises a floor heating heat exchange assembly and an eighth pipeline, the floor heating heat exchange assembly is arranged on the eighth pipeline, a fifth throttling device is arranged on the eighth pipeline, and one end of the eighth pipeline is communicated to the liquid side pipe and the other end of the eighth pipeline is communicated to the first gas side pipe.

In some embodiments, one end of the outdoor heat exchanger is communicated with the second end of the four-way valve, the other end of the outdoor heat exchanger is communicated with a subcooler, the other end of the subcooler is communicated to the liquid side pipe, and a sixth throttling device is further arranged between the outdoor heat exchanger and the subcooler.

In some embodiments, the air conditioner further comprises a ninth pipeline, one end of the ninth pipeline is communicated with the liquid side pipe between the subcooler and the indoor side, the other end of the ninth pipeline penetrates through the subcooler and is communicated to the air suction end of the compressor unit, and a seventh throttling device is further arranged on the ninth pipeline.

In some embodiments, the air suction end of the compressor unit is further communicated with a gas-liquid separator; and/or the compressor set comprises a first compressor and a second compressor which are arranged in parallel; and/or the first control valve and/or the second control valve are solenoid valves.

The present disclosure also provides a control method of a multi-split air conditioner as set forth in any one of the above, which implements at least one of cooling, heating, and heating modes for a room by controlling the four-way valve, the first control valve, and the second control valve.

In some embodiments, when refrigeration is required, the first control valve is controlled to be opened, the second control valve is controlled to be closed, a four-way valve is controlled to enable the first end to be communicated with the second end and the third end to be communicated with the fourth end, and when a first throttling device is included, the first throttling device is opened.

In some embodiments, when cooling and heating water are required, the first control valve is controlled to be opened, the second control valve is controlled to be closed, and a four-way valve is controlled to communicate the first end with the second end and the third end with the fourth end.

In some embodiments, when heating is required, the first control valve is controlled to be closed, the second control valve is controlled to be opened, and meanwhile, a four-way valve is controlled to enable the first end and the third end to be communicated and the second end and the fourth end to be communicated; when a first throttling device is included, opening the first throttling device; and/or, when a second throttling means is included, opening said second throttling means; and/or, when a third throttling means is included, turning on the third throttling means.

In some embodiments, when heating + heating water is required, the first control valve is controlled to be closed, the second control valve is controlled to be closed, and a four-way valve is controlled to communicate the first end with the third end and the second end with the fourth end.

The multi-split air conditioner and the control method thereof have the following beneficial effects:

this is disclosed through the mode that utilizes a cross valve and two solenoid valve combination controls to replace two cross valve controls, can realize effectively that original scheme that adopts the many online of two cross valves can realize equally a plurality of modes such as refrigeration, heat, refrigeration + system hot water, heat + system hot water, system hot water + heating, the scheme of this disclosure not only can provide bigger space and more excellent scheme for the design of unit pipe-line system, and because the gas tightness of solenoid valve itself also will be better than the cross valve, so also can improve the gas tightness of system to a certain extent, effectively solved two cross valve systems and occupied the big problem of space in the unit structure, can improve space utilization, the optimal design, the cost also will be lower than two cross valves simultaneously.

Drawings

Fig. 1 is a system configuration diagram of a multi-split air conditioner of the present disclosure;

fig. 2 is a system diagram of a multi-split air conditioner of the present disclosure in a cooling mode;

fig. 3 is a system diagram of a multi-split air conditioner of the present disclosure in a cooling + heating mode;

fig. 4 is a system diagram of a multi-split air conditioner of the present disclosure in a heating mode;

fig. 5 is a system diagram of the multi-split air conditioner of the present disclosure in a heating + heating water mode.

The reference numerals are represented as:

1. a compressor unit; 11. a first compressor; 12. a second compressor; 1a, a suction end; 1b, an exhaust end; 2. an outdoor heat exchanger; 31. a first gas-side tube; 32. a second gas-side tube; 33. a liquid side pipe; 4. a four-way valve; D. a first end; C. a second end; E. a third end; s, a fourth end; 51. a first control valve; 52. a second control valve; 53. a third control valve; 54. a fourth control valve; 61. an indoor unit; 611. an indoor heat exchanger; 62. a constant-temperature dehumidification inner machine; 621. a first heat exchanger; 622. a second heat exchanger; 71. a first throttling device; 72. a second throttling device; 73. a third throttling means; 74. a fourth throttling device; 75. a fifth throttling device; 76. a sixth throttling means; 77. a seventh throttling means; 8. a hot water module; 81. a water tank; 9. a floor heating module; 91. a ground heating heat exchange assembly; 13. a subcooler; 14. a gas-liquid separator; 151. a first large valve; 152. a second large valve; 153. a small valve; 101. a first branch; 102. indoor unit pipelines; 103. a third pipeline; 104. a fourth pipeline; 105. a fifth pipeline; 106. a sixth pipeline; 107. a seventh pipeline; 108. an eighth pipeline; 109. a ninth pipeline.

Detailed Description

As shown in fig. 1 to 5, the present disclosure provides a multi-split air conditioner, which includes:

the compressor unit 1 (comprising at least one compressor), an outdoor heat exchanger 2, a first gas side pipe 31, a second gas side pipe 32 and a liquid side pipe 33, wherein the pressure of the first gas side pipe 31 is greater than that of the second gas side pipe 32, and the first gas side pipe 31 is communicated with the exhaust end of the compressor unit 1;

the system further comprises a four-way valve 4, a first control valve 51 and a second control valve 52, wherein a first end D of the four-way valve 4 is communicated with the first gas side pipe 31, a second end C is communicated with the outdoor heat exchanger 2, and a third end E and a fourth end S are communicated and communicated with a suction end of the compressor unit 1;

the first control valve 51 is arranged on the second air side pipe 32, and one end of the second air side pipe 32 is also communicated to the air suction end of the compressor unit 1; the second control valve 52 is disposed on the first branch 101, and one end of the first branch 101 is connected to the first air side pipe 31, and the other end is connected to the second air side pipe 32.

This is disclosed through the mode that utilizes a cross valve and two solenoid valve combination controls to replace two cross valve controls, can realize effectively that original scheme that adopts the many online of two cross valves can realize equally a plurality of modes such as refrigeration, heat, refrigeration + system hot water, heat + system hot water, system hot water + heating, the scheme of this disclosure not only can provide bigger space and more excellent scheme for the design of unit pipe-line system, and because the gas tightness of solenoid valve itself also will be better than the cross valve, so also can improve the gas tightness of system to a certain extent, effectively solved two cross valve systems and occupied the big problem of space in the unit structure, can improve space utilization, the optimal design, the cost also will be lower than two cross valves simultaneously.

The outer machine part of the system mainly comprises: the system comprises a compressor (which can be 1 or a plurality of compressors), 1 four-way valve, two matched electromagnetic valves, 1 outdoor unit heat exchanger (namely an outdoor heat exchanger), 1 plate type heat exchanger (namely an subcooler), 2 electronic expansion valves (a heating electronic expansion valve (namely a sixth throttling device 76), a subcooler electronic expansion valve (namely a seventh throttling device 77)), a fan and the like;

the indoor machine of the system can be divided into 2 types, one type is a single heat exchanger indoor machine, and the single heat exchanger indoor machine comprises 1 heat exchanger, 1 electronic expansion valve, a fan and the like; the other type is an indoor unit (namely a constant-temperature dehumidification indoor unit) with double heat exchangers, and the indoor unit comprises 2 heat exchangers (a floor heating heat exchanger and a second heat exchanger), 2 electronic expansion valves, a fan and the like.

The hot water module of the system comprises: 2 electromagnetic valves, a water tank and 1 electronic expansion valve;

the floor heating module of system contains: 1 set (or a plurality of sets) of heat exchange tail ends of the floor heating coil pipes and 1 (or a plurality of) electronic expansion valves.

The system is of a three-tube system, namely, a constant high-pressure air tube (a high-pressure section of an air side tube in a system diagram, namely a first air side tube 31) is arranged in addition to a common liquid side tube 33 and a second air side tube 32.

In some embodiments, the four-way valve 4 can be switched between a first state and a second state, the first state is a state in which the first terminal D communicates with the second terminal C while the third terminal E communicates with the fourth terminal S, and the second state is a state in which the first terminal D communicates with the third terminal E while the second terminal C communicates with the fourth terminal S. This is the preferred configuration of the four-way valve of the present disclosure in two states, namely, the first end D is in communication with the second end C while the third end E is in communication with the fourth end S, and the first end D is in communication with the third end E while the second end C is in communication with the fourth end S, which enables the four-way valve to be connected with two control valves from different on states to form different modes and combinations between the modes.

In some embodiments, at least one indoor unit 61 is further disposed between the second air side pipe 32 and the liquid side pipe 33, the indoor unit 61 includes an indoor heat exchanger 611 and an indoor unit pipe 102, and the indoor unit pipe 102 is disposed with the indoor heat exchanger 611 and the first throttling device 71. This is disclosed through the indoor set that connects between second gas side pipe and the liquid side pipe and set up, and the indoor set includes indoor heat exchanger and indoor set pipeline and first throttling arrangement, can make many online systems with the refrigerant leading-in to the indoor heat exchanger of indoor set in, in order to refrigerate or heat to carry out effectual throttle step-down effect through first throttling arrangement.

In some embodiments, the indoor constant temperature dehumidification unit 62 is further included, the indoor constant temperature dehumidification unit 62 includes a first heat exchanger 621 and a second heat exchanger 622, the first heat exchanger 621 is disposed on the third pipeline 103, one end of the third pipeline 103 is communicated to the second air side pipe 32, the other end is communicated to the liquid side pipe 33, the third pipeline 103 is further provided with a second throttling device 72, the second heat exchanger 622 is disposed on the fourth pipeline 104, one end of the fourth pipeline 104 is communicated to the first air side pipe 31, the other end is communicated to the liquid side pipe 33, and the fourth pipeline 104 is further provided with a third throttling device 73. The utility model discloses still through setting up the constant temperature dehumidification indoor unit, it includes first and second heat exchanger, and first heat exchanger is connected between second gas side pipe and liquid side pipe, can carry out the effect of cooling evaporation through this first heat exchanger, in order to cool down the air, and set up between first gas side pipe and liquid side pipe through the second heat exchanger, can carry out the exothermic effect of condensation through the second heat exchanger, in order to heat the air, finally make the air earlier through first heat exchanger cooling, the dehumidification, the rethread second heat exchanger heats up the effect of heating, the completion carries out the effect of constant temperature dehumidification to the air.

In some embodiments, the at least one hot water module 8 is further included, the hot water module 8 includes a water tank 81 and a fifth pipeline 105, the water tank 81 is disposed on the fifth pipeline 105, a fourth throttling device 74 is disposed on the fifth pipeline 105, one end of the fifth pipeline 105 is communicated to the liquid side pipe 33, the other end of the fifth pipeline 105 is communicated to the first air side pipe 31 through a sixth pipeline 106, and the other end of the fifth pipeline 105 is further communicated to the second air side pipe 32 through a seventh pipeline 107 (this case includes a scheme with third and fourth control valves, and also includes a scheme without third and fourth control valves). This is openly through setting up the hot water module to make the water tank can communicate to between first gas side pipe and the liquid side pipe, can flow through the water tank through the refrigerant between first gas side pipe and the liquid side pipe and heat in order to prepare hot water to water, the rethread water tank communicates to between second gas side pipe and the liquid side pipe, can flow through the water tank through the refrigerant between second gas side pipe and the liquid side pipe in order to heat water and prepare hot water.

In some embodiments, a third control valve 53 is further disposed on the sixth line 106, and a fourth control valve 54 is further disposed on the seventh line 107. This is disclosed still can control whether the water tank switches on with first gas side pipe and liquid side pipe through the third control valve that sets up on the sixth pipeline, can control whether the water tank switches on with second gas side pipe and liquid side pipe through the fourth control valve that sets up on the seventh pipeline.

In some embodiments, the floor heating module 9 further comprises at least one floor heating module 9, the floor heating module 9 comprises a floor heating heat exchange assembly 91 and an eighth pipeline 108, the floor heating heat exchange assembly 91 is arranged on the eighth pipeline 108, a fifth throttling device 75 is arranged on the eighth pipeline 108, one end of the eighth pipeline 108 is communicated to the liquid side pipe 33, and the other end of the eighth pipeline 108 is communicated to the first gas side pipe 31. This openly through warm up the module to through warm up heat exchange assembly and eighth pipeline's setting, make warm up heat exchange assembly and connect between first gas side pipe and liquid side pipe, in order to utilize the refrigerant to warm up heat exchange assembly and effectively heat, in order to accomplish the effect of heating.

In some embodiments, one end of the outdoor heat exchanger 2 is communicated with the second end C of the four-way valve 4, the other end is communicated with a subcooler 13, the other end of the subcooler 13 is communicated with the liquid side pipe 33, and a sixth throttling device 76 is further arranged between the outdoor heat exchanger 2 and the subcooler 13. The outdoor heat exchanger can be heated or cooled through the arrangement of the subcooler, the outdoor heat exchanger and the sixth throttling device, and the subcooler can be used for subcooling the refrigerant.

In some embodiments, a ninth pipeline 109 is further included, one end of the ninth pipeline 109 is communicated with the liquid side pipe 33 between the subcooler 13 and the indoor side, and the other end passes through the subcooler 13 and is communicated to the suction end of the compressor unit 1, and a seventh throttling device 77 is further disposed on the ninth pipeline 109. The refrigerant enters the subcooler to absorb heat and raise temperature after being depressurized by the seventh throttling device of the ninth pipeline, finally returns to the compressor, and cools the other pipeline, so that the supercooling effect is achieved, and the evaporation heat absorption efficiency is improved.

In some embodiments, the air suction end of the compressor unit 1 is further communicated with a gas-liquid separator 14; and/or, the compressor unit 1 comprises a first compressor 11 and a second compressor 12 which are arranged in parallel; and/or the first control valve 51 and/or the second control valve 52 are solenoid valves. The air-liquid separator can perform the function of gas-liquid separation, the two parallel compressors can perform the effect of improving the displacement and the refrigerant running capacity, the control valve is preferably an electromagnetic valve which can provide a larger space and a better scheme for the design of a unit pipeline system, and the air tightness of the electromagnetic valve is better than that of a four-way valve, so that the air tightness of the system can be improved to a certain extent.

The present disclosure also provides a control method of a multi-split air conditioner as set forth in any one of the above, which implements at least one of cooling, heating, and heating modes for a room by controlling the four-way valve 4, the first control valve 51, and the second control valve 52. This is disclosed through the mode that utilizes a cross valve and two solenoid valve combination controls to replace two cross valve controls, can realize effectively that original scheme that adopts the many online of two cross valves can realize equally a plurality of modes such as refrigeration, heat, refrigeration + system hot water, heat + system hot water, system hot water + heating, the scheme of this disclosure not only can provide bigger space and more excellent scheme for the design of unit pipe-line system, and because the gas tightness of solenoid valve itself also will be better than the cross valve, so also can improve the gas tightness of system to a certain extent, effectively solved two cross valve systems and occupied the big problem of space in the unit structure, can improve space utilization, the optimal design, the cost also will be lower than two cross valves simultaneously.

In some embodiments, when cooling is required, the first control valve 51 is controlled to be opened, the second control valve 52 is controlled to be closed, and the four-way valve 4 is controlled to communicate the first end D with the second end C and communicate the third end E with the fourth end S, and when the first throttling device 71 is included, the first throttling device 71 is opened.

When the system is used for cooling, the second control valve 52 is normally closed, and the first control valve 51 is normally opened, and the system diagram is shown in fig. 2. The exhaust gas of the compressor passes through a four-way valve (DC section) to an outdoor heat exchanger, is condensed and released in a condenser of the outdoor heat exchanger, flows through a heating electronic expansion valve and a subcooler in a fully-opened state, enters an indoor unit (an indoor unit 1/an indoor unit n and a constant-temperature dehumidification indoor unit 1/a constant-temperature dehumidification indoor unit n), is throttled by the electronic expansion valve and then enters the indoor heat exchanger (if the indoor unit is opened, a refrigerant passes through a first heat exchanger 621), the refrigerant evaporates and absorbs heat in the heat exchanger and then flows out, returns to a vapor-liquid separator through a low-pressure gas pipe and finally returns to the compressor, and a refrigeration cycle.

In some embodiments, when cooling and heating water are required, the first control valve 51 is controlled to be opened, the second control valve 52 is controlled to be closed, and the four-way valve 4 is controlled such that the first end D and the second end C are communicated and the third end E and the fourth end S are communicated, and when the first throttling means 71 is included, the first throttling means 71 is opened, and when the third control valve 53 and the fourth control valve 54 are included, the third control valve 53 is opened and the fourth control valve 54 is closed.

When the system is used for cooling and heating water, the second control valve 52 is normally closed, and the first control valve 51 is normally opened, and the system diagram is shown in fig. 3. The cycle is performed as described in the above 2 when the cooling function is realized. The water tank flow path is added during water heating, refrigerant is discharged from the compressor, and directly enters the water tank module through a constant high-pressure pipe (namely a pipe side high-pressure pipe section in a system diagram) to heat water without passing through the four-way valve, then flows out of the water tank module, and goes through a low-pressure side air pipe to a steam separator through an indoor unit heat exchanger, and finally returns to the compressor to complete the circulation of the water heating.

In some embodiments, when heating is required, the first control valve 51 is controlled to be closed, the second control valve 52 is controlled to be opened, and the four-way valve 4 is controlled to enable the first end D and the third end E to be communicated and the second end C and the fourth end S to be communicated; when the first throttle device 71 is included, the first throttle device 71 is opened; and/or, when a second flow restriction 72 is included, opening said second flow restriction 72; and/or, when a third throttling means 73 is included, said third throttling means 73 is opened.

When the system heats, the second control valve 52 is normally opened, and the first control valve 51 is normally closed, and the system diagram is shown in fig. 4. When heating, the exhaust gas of the compressor enters the indoor side through the second control valve 52 (main path) and the constant-pressure pipe (first air side pipe 31), heat exchange is carried out on the heat exchanger of the indoor unit (for the constant-temperature dehumidification indoor unit, the refrigerant flowing through the main path can carry out heat exchange on the first heat exchanger 621 of the indoor unit, the refrigerant flowing through the constant-pressure pipe can carry out heat exchange on the second heat exchanger 622 of the indoor unit), the refrigerants after heat exchange all flow out through the liquid side pipe, pass through the subcooler and the heat exchanger of the outdoor unit, pass through the four-way valve (CS section) to the steam branch after evaporating and absorbing heat in the subcooler and the heat exchanger of the outdoor unit, finally return to the compressor through the steam branch.

In some embodiments, when heating + heating water is required, the first control valve 51 is controlled to be closed, the second control valve 52 is controlled to be closed, and the four-way valve 4 is controlled such that the first end D and the third end E are communicated and the second end C and the fourth end S are communicated, when the third control valve 53 and the fourth control valve 54 are included, the third control valve 53 is opened and the fourth control valve 54 is closed, and when the sixth throttling device 76 is included, the sixth throttling device 76 is controlled to be opened.

When the system is only used for floor heating and water heating, neither the first control valve 51 nor the second control valve 52 is opened, and the system diagram is shown in fig. 5. The exhaust of the compressor directly enters the floor heating module and the hot water module through the constant high-pressure pipe to respectively realize the floor heating function and the hot water making function, then the refrigerant enters the outdoor unit through the liquid side pipe, is evaporated and absorbed by the outdoor unit heat exchanger, then reaches the steam separator through the four-way valve (CS section), finally returns to the compressor, and a cycle is completed.

The above description is only exemplary of the present disclosure and should not be taken as limiting the disclosure, as any modification, equivalent replacement, or improvement made within the spirit and principle of the present disclosure should be included in the scope of the present disclosure. The foregoing is only a preferred embodiment of the present disclosure, and it should be noted that, for those skilled in the art, several modifications and variations can be made without departing from the technical principle of the present disclosure, and these modifications and variations should also be regarded as the protection scope of the present disclosure.

Claims (15)

1. The utility model provides a many online air conditioners which characterized in that: the method comprises the following steps:

the air conditioner comprises a compressor unit (1), an outdoor heat exchanger (2), a first air side pipe (31), a second air side pipe (32) and a liquid side pipe (33), wherein the first air side pipe (31) is communicated with the exhaust end of the compressor unit (1);

the compressor further comprises a four-way valve (4), a first control valve (51) and a second control valve (52), wherein a first end (D) of the four-way valve (4) is communicated with the first air side pipe (31), a second end (C) of the four-way valve is communicated with the outdoor heat exchanger (2), and a third end (E) and a fourth end (S) of the four-way valve are communicated with an air suction end of the compressor unit (1);

the first control valve (51) is arranged on the second air side pipe (32), and one end of the second air side pipe (32) is also communicated to the air suction end of the compressor unit (1); the second control valve (52) is arranged on a first branch (101), one end of the first branch (101) is communicated to the first gas side pipe (31), and the other end of the first branch is communicated to the second gas side pipe (32).

2. A multi-split air conditioner as recited in claim 1, wherein:

the four-way valve (4) can be switched between a first state and a second state, wherein the first state is that the first end (D) is communicated with the second end (C) and the third end (E) is communicated with the fourth end (S), and the second state is that the first end (D) is communicated with the third end (E) and the second end (C) is communicated with the fourth end (S).

3. A multi-split air conditioner as set forth in any one of claims 1-2, wherein:

at least one indoor unit (61) is further arranged between the second air side pipe (32) and the liquid side pipe (33), 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. A multi-split air conditioner as set forth in any one of claims 1 to 3, wherein:

the constant-temperature dehumidification indoor unit (62) comprises a first heat exchanger (621) and a second heat exchanger (622), the first heat exchanger (621) is arranged on a third pipeline (103), one end of the third pipeline (103) is communicated to a second air side pipe (32), the other end of the third pipeline (103) is communicated to a liquid side pipe (33), a second throttling device (72) is further arranged on the third pipeline (103), the second heat exchanger (622) is arranged on a fourth pipeline (104), one end of the fourth pipeline (104) is communicated to a first air side pipe (31), the other end of the fourth pipeline is communicated to the liquid side pipe (33), and a third throttling device (73) is further arranged on the fourth pipeline (104).

5. A multi-split air conditioner as set forth in any one of claims 1 to 4, wherein:

the hot water system is characterized by further comprising at least one hot water module (8), wherein the hot water module (8) comprises a water tank (81) and a fifth pipeline (105), the water tank (81) is arranged on the fifth pipeline (105), a fourth throttling device (74) is arranged on the fifth pipeline (105), one end of the fifth pipeline (105) is communicated to the liquid side pipe (33), the other end of the fifth pipeline (105) is communicated to the first air side pipe (31) through a sixth pipeline (106), and the other end of the fifth pipeline (105) is communicated to the second air side pipe (32) through a seventh pipeline (107).

6. A multi-split air conditioner as recited in claim 5, wherein:

the sixth pipeline (106) is also provided with a third control valve (53), and the seventh pipeline (107) is also provided with a fourth control valve (54).

7. A multi-split air conditioner as set forth in any one of claims 1 to 6, wherein:

the floor heating system is characterized by further comprising at least one floor heating module (9), wherein the floor heating module (9) comprises a floor heating heat exchange assembly (91) and an eighth pipeline (108), the floor heating heat exchange assembly (91) is arranged on the eighth pipeline (108), a fifth throttling device (75) is arranged on the eighth pipeline (108), and one end of the eighth pipeline (108) is communicated to the liquid side pipe (33) and the other end of the eighth pipeline is communicated to the first gas side pipe (31).

8. A multi-split air conditioner as set forth in any one of claims 1 to 7, wherein:

one end of the outdoor heat exchanger (2) is communicated with the second end (C) of the four-way valve (4), the other end of the outdoor heat exchanger is communicated with the subcooler (13), the other end of the subcooler (13) is communicated to the liquid side pipe (33), and a sixth throttling device (76) is further arranged between the outdoor heat exchanger (2) and the subcooler (13).

9. A multi-split air conditioner as recited in claim 8, wherein:

the air conditioner further comprises a ninth pipeline (109), one end of the ninth pipeline (109) is communicated with the liquid side pipe (33) between the subcooler (13) and the indoor side, the other end of the ninth pipeline (109) penetrates through the subcooler (13) and is communicated to the air suction end of the compressor unit (1), and a seventh throttling device (77) is further arranged on the ninth pipeline (109).

10. A multi-split air conditioner as set forth in any one of claims 1 to 9, wherein:

the air suction end of the compressor unit (1) is also communicated with a gas-liquid separator (14); and/or the compressor group (1) comprises a first compressor (11) and a second compressor (12) which are arranged in parallel; and/or the first control valve (51) and/or the second control valve (52) are solenoid valves.

11. A control method of a multi-split air conditioner as set forth in any one of claims 1 to 10, wherein: and realizing at least one mode of indoor cooling, heating and heating by controlling the four-way valve (4), the first control valve (51) and the second control valve (52).

12. The control method of a multi-split air conditioner as set forth in claim 11, wherein:

when refrigeration is needed, the first control valve (51) is controlled to be opened, the second control valve (52) is controlled to be closed, meanwhile, the four-way valve (4) is controlled to enable the first end (D) to be communicated with the second end (C) and the third end (E) to be communicated with the fourth end (S), and when a first throttling device (71) is included, the first throttling device (71) is opened.

13. The control method of a multi-split air conditioner as set forth in claim 11, wherein:

when refrigeration and heating water are required, the first control valve (51) is controlled to be opened, the second control valve (52) is controlled to be closed, and the four-way valve (4) is controlled to enable the first end (D) to be communicated with the second end (C) and the third end (E) to be communicated with the fourth end (S), when a first throttling device (71) is included, the first throttling device (71) is opened, when a third control valve (53) and a fourth control valve (54) are included, the third control valve (53) is opened and the fourth control valve (54) is closed.

14. The control method of a multi-split air conditioner as set forth in claim 11, wherein:

when heating is needed, the first control valve (51) is controlled to be closed, the second control valve (52) is controlled to be opened, and meanwhile, the four-way valve (4) is controlled to enable the first end (D) to be communicated with the third end (E) and the second end (C) to be communicated with the fourth end (S); when a first throttling means (71) is included, opening the first throttling means (71); and/or, when a second throttling means (72) is included, opening said second throttling means (72); and/or, when a third throttling means (73) is included, opening said third throttling means (73).

15. The control method of a multi-split air conditioner as set forth in claim 11, wherein:

when heating and hot water heating are needed, the first control valve (51) is controlled to be closed, the second control valve (52) is controlled to be closed, and meanwhile, the four-way valve (4) is controlled to enable the first end (D) to be communicated with the third end (E) and the second end (C) to be communicated with the fourth end (S);

when a third control valve (53) and a fourth control valve (54) are included, opening the third control valve (53) and closing the fourth control valve (54);

when a sixth throttling means (76) is included, the sixth throttling means (76) is controlled to open.

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