Air conditioning system and control method thereof

Abstract

The invention relates to the technical field of air conditioning systems, particularly provides an air conditioning system and a control method thereof, and aims to solve the problem that a home machine system cannot meet different air conditioning requirements of a plurality of rooms. In order to achieve the purpose, the air conditioning system comprises an outdoor heat exchanger, a compressor, a control assembly and at least two indoor units. The control method of the air conditioning system comprises the following operation modes that the indoor heat exchanger serves as a condenser, the first type of indoor unit conducts refrigeration, and the second type of indoor unit conducts reheating dehumidification. The control assembly can control the working states of the outdoor heat exchanger and the three indoor heat exchangers in each indoor unit, and each indoor unit of the air conditioning system can adopt different operation modes. When the multiple indoor units are arranged in different rooms respectively, different air conditioning requirements of the multiple rooms can be met.

Description

Technical Field

[0001] The present invention relates to the technical field of air conditioning systems, and specifically provides an air conditioning system and a control method thereof. Background Art

[0002] The home air conditioning system refers to the home central air conditioning system, which is mainly used to meet the air conditioning needs of multiple rooms. However, the traditional home air conditioning system is a two-pipe system, with cooling and dehumidification coupled. Dehumidification will also reduce the temperature, and the temperature in the evaporator in the dehumidification mode is lower than that in the cooling mode, resulting in a cooler air outlet temperature, causing discomfort to the human body.

[0003] To solve this problem, the existing technology provides a three-pipe home air conditioner system, which heats the dry cold air to a suitable temperature and blows it out after cooling and dehumidifying, thereby reducing the coupling of temperature and humidity, and achieving dehumidification without cooling and blowing without biting air.

[0004] When air conditioning a room, three-pipe control can meet the needs of cooling or dehumidification only, but for a system such as a home unit connected to each room, it needs to meet the needs of different rooms at the same time. For example, room A needs cooling while room B needs constant temperature dehumidification. Since the refrigeration circuits of the two rooms are connected and shared, if the comfort cooling needs of room A are met, room B cannot be effectively dehumidified. If the dehumidification needs of room B are met, the blowing temperature of room A will be low.

[0005] Therefore, there is an urgent need in the art for an air conditioning system and a control method thereof to solve the above problems. Summary of the invention

[0006] The present invention aims to solve the above technical problem, that is, to solve the problem that a home air conditioning system cannot meet different air conditioning requirements for multiple rooms.

[0007] In a first aspect, the present invention provides an air conditioning system comprising an outdoor heat exchanger, a compressor, a control assembly, and at least two indoor units;

[0008] The indoor unit includes a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger;

[0009] The first indoor heat exchanger and the outdoor heat exchanger are both connected to the compressor via the control component, and the control component can control any one of the first indoor heat exchanger and the outdoor heat exchanger to act as a condenser and the other to act as an evaporator;

[0010] The second indoor heat exchanger is connected to the air intake port of the compressor through a control component so that the second indoor heat exchanger can serve as an evaporator;

[0011] The third indoor heat exchanger is connected to the exhaust port of the compressor through a control component so that the third indoor heat exchanger can serve as a condenser;

[0012] The control component can also shut down any one or more of the indoor unit, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger;

[0013] The control component can also control the heat absorption capacity of the second indoor heat exchanger as an evaporator, so that the second indoor heat exchanger can absorb heat and dehumidify.

[0014] In a specific embodiment of the above air conditioning system, the compressor is provided with a first air intake port, a second air intake port and an air exhaust port;

[0015] The control assembly comprises a four-way valve, a first interface of the four-way valve is connected to the first air inlet;

[0016] The first sides of the plurality of first indoor heat exchangers are connected in parallel to one end of the first pipeline, and the second interface of the four-way valve is connected to the other end;

[0017] The third interface of the four-way valve is connected to the outdoor heat exchanger and the second air intake port;

[0018] The fourth interface of the four-way valve is connected to the exhaust port;

[0019] Controlling the four-way valve enables the first air intake port to be connected to the first pipeline, and the outdoor heat exchanger and the second air intake port to be connected to the exhaust port, so that the first indoor heat exchanger serves as an evaporator and the outdoor heat exchanger serves as a condenser;

[0020] Controlling the four-way valve can also connect the first air intake port to the outdoor heat exchanger and the second air intake port, and connect the first pipeline to the exhaust port, so that the first indoor heat exchanger acts as a condenser and the outdoor heat exchanger acts as an evaporator.

[0021] In a specific embodiment of the above air conditioning system, the third interface is connected to the first branch, the outdoor heat exchanger is connected to the second branch, the second air intake is connected to the third branch, and the first branch, the second branch and the third branch are connected at one point;

[0022] The control component also includes a branch control valve, which is arranged on the third branch and can control the flow of refrigerant flowing through the third branch.

[0023] In a specific embodiment of the above air-conditioning system, the control component further includes a first control valve, which is arranged on the first pipeline, and the first control valve can control the flow of refrigerant flowing through the first indoor heat exchanger; and / or

[0024] The first sides of the plurality of second indoor heat exchangers are connected in parallel to one end of the second pipeline, and the second air intake port is connected to the other end, and the control assembly further comprises a second control valve, which is arranged on the second pipeline between the second indoor heat exchanger and the second air intake port, and the second control valve can control the refrigerant flow rate flowing through the second indoor heat exchanger; and / or

[0025] The first sides of the plurality of third indoor heat exchangers are connected in parallel to one end of a third pipeline, and the exhaust port is connected to the other end, and the control assembly further comprises a third control valve, which is arranged on the third pipeline between the third indoor heat exchanger and the exhaust port, and the third control valve is capable of controlling the refrigerant flow through the third indoor heat exchanger; and / or

[0026] The outdoor heat exchanger is connected to one end of the fourth pipeline, and the second sides of the first indoor heat exchangers, the second sides of the second indoor heat exchangers and the second sides of the third indoor heat exchangers are all connected to the other end of the fourth pipeline. The control component also includes a fourth control valve, which is arranged on the fourth pipeline between the outdoor heat exchanger and the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger. The fourth control valve can control the refrigerant flow rate flowing through the fourth pipeline.

[0027] In a specific embodiment of the above air conditioning system, a first expansion valve is provided between the first indoor heat exchanger and the fourth pipeline; and / or

[0028] A second expansion valve is provided between the second indoor heat exchanger and the fourth pipeline; and / or

[0029] A third expansion valve is provided between the third indoor heat exchanger and the fourth pipeline; and / or

[0030] A fourth expansion valve is provided between the outdoor heat exchanger and the fourth pipeline.

[0031] In a specific implementation of the above air-conditioning system, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are arranged in sequence according to wind direction.

[0032] In a second aspect, the present invention provides a control method for an air-conditioning system, wherein the air-conditioning system is the above-mentioned air-conditioning system, the plurality of indoor units are divided into a first type of indoor unit group and a second type of indoor unit group, and the control method includes the following operation modes:

[0033] The indoor heat exchanger acts as a condenser to release heat;

[0034] The first indoor heat exchanger of the first type indoor unit acts as an evaporator to absorb heat, and at least one of the second indoor heat exchanger and the third indoor heat exchanger is turned off, so that the first type indoor unit can perform cooling;

[0035] The first indoor heat exchanger of the second type indoor unit is closed, the second indoor heat exchanger acts as an evaporator to absorb heat and dehumidify, and the third indoor heat exchanger acts as a condenser to release heat, so that the second type indoor unit can reheat and dehumidify.

[0036] In a specific implementation of the above control method, the control method also includes the following operating modes:

[0037] The indoor heat exchanger acts as a condenser to release heat;

[0038] The first indoor heat exchanger of the first type of indoor unit acts as an evaporator to absorb heat, the second indoor heat exchanger acts as an evaporator to absorb heat and dehumidify, and the third indoor heat exchanger is turned off so that the first type of indoor unit can dehumidify;

[0039] The first indoor heat exchanger and the second indoor heat exchanger of the second type indoor unit are both turned off, and the third indoor heat exchanger acts as a condenser to release heat, so that the second type indoor unit can generate heat.

[0040] In a specific implementation of the above control method, the control method also includes the following operating modes:

[0041] The indoor heat exchanger acts as an evaporator to absorb heat;

[0042] The first indoor heat exchanger of the first type of indoor unit is turned off, the second indoor heat exchanger acts as an evaporator to absorb heat and dehumidify, and the third indoor heat exchanger acts as a condenser to release heat, so that the first type of indoor unit can reheat and dehumidify;

[0043] The first indoor heat exchanger and the second indoor heat exchanger of the second type indoor unit are both turned off, and the third indoor heat exchanger acts as a condenser to release heat, so that the second type indoor unit can generate heat.

[0044] In a specific implementation of the above control method, the control method also includes the following operating modes:

[0045] The indoor heat exchanger is turned off;

[0046] The first indoor heat exchanger of the first type of indoor unit acts as an evaporator to absorb heat, the second indoor heat exchanger acts as an evaporator to absorb heat and dehumidify, and the third indoor heat exchanger is turned off so that the first type of indoor unit can dehumidify;

[0047] The first indoor heat exchanger and the second indoor heat exchanger of the second type indoor unit are both turned off, and the third indoor heat exchanger acts as a condenser to release heat, so that the second type indoor unit can generate heat.

[0048] When the above technical solution is adopted, the control component of the present invention can control the working state of the outdoor heat exchanger and the three indoor heat exchangers in each indoor unit, that is, the indoor heat exchanger can be used as a condenser, an evaporator or turned off, the first indoor heat exchanger can also be used as a condenser, an evaporator or turned off, the second indoor heat exchanger can be used as an evaporator or turned off, and the third indoor heat exchanger can be used as a condenser or turned off. By combining the working states of the three indoor heat exchangers in each indoor unit, the indoor unit can have multiple operating states. Since the control component can control the working states of the three indoor heat exchangers in each indoor unit individually, and the air-conditioning system of the outdoor heat exchanger and at least two indoor heat exchangers can realize the operating mode of turning off one of them, each indoor unit of the air-conditioning system can adopt a different operating mode. When multiple indoor units are respectively arranged in different rooms, different air conditioning requirements for multiple rooms can be met. BRIEF DESCRIPTION OF THE DRAWINGS

[0049] The preferred embodiments of the present invention are described below in conjunction with the accompanying drawings, in which:

[0050] Figure 1 is a structural schematic diagram of an air conditioning system provided by the present invention;

[0051] Figure 2 It is a schematic structural diagram of three indoor heat exchangers of the indoor unit provided by the present invention;

[0052] Figure 3 is a schematic diagram of the operating state of the first operating mode of the air-conditioning system provided by the present invention;

[0053] Figure 4 is a schematic diagram of the operating state of the second operating mode of the air-conditioning system provided by the present invention;

[0054] Figure 5 is a schematic diagram of the operating state of the third operating mode of the air-conditioning system provided by the present invention;

[0055] Figure 6 is a schematic diagram of the operating state of the fourth operating mode of the air-conditioning system provided by the present invention;

[0056] Figure 7is a schematic diagram of the operating state of the fifth operating mode of the air-conditioning system provided by the present invention;

[0057] Figure 8 is a schematic diagram of the operating state of the sixth operating mode of the air-conditioning system provided by the present invention;

[0058] Fig. 9 is a schematic diagram of the operating state of the seventh operating mode of the air-conditioning system provided by the present invention;

[0059] Fig.10 is a schematic diagram of the operating state of the eighth operating mode of the air-conditioning system provided by the present invention;

[0060] Fig.11 is a schematic diagram of the operating state of the ninth operating mode of the air-conditioning system provided by the present invention;

[0061] Fig.12 is a schematic diagram of the operating state of the tenth operating mode of the air-conditioning system provided by the present invention;

[0062] Fig.13 It is a schematic diagram of the operating status of the eleventh operating mode of the air-conditioning system provided by the present invention.

[0063] In the figure, the arrows on the pipeline indicate the flow direction of the refrigerant in the pipeline, the heat exchanger and pipeline in the form of dotted lines indicate that they are in a closed state, the heat exchanger with a hollow interior indicates that it is used as a condenser for heating, the heat exchanger filled with one-way oblique lines inside indicates that it is used as an evaporator for cooling, and the heat exchanger filled with cross oblique lines inside indicates that it is used as an evaporator for dehumidification.

[0064] List of reference numerals:

[0065] 1. Outdoor heat exchanger; 2. Compressor; 201. First air intake port; 202. Second air intake port; 203. Exhaust port;

[0066] 301, four-way valve; 302, branch control valve; 303, first control valve; 304, second control valve; 305, third control valve; 306, fourth control valve; 307, fourth expansion valve;

[0067] 401, first pipeline; 402, second pipeline; 403, third pipeline; 404, fourth pipeline;

[0068] 501, first branch road; 502, second branch road; 503, third branch road;

[0069] A, first type indoor unit; A1, first indoor heat exchanger of first type indoor unit; A10, first expansion valve of first type indoor unit; A2, second indoor heat exchanger of first type indoor unit; A20, second expansion valve of first type indoor unit; A3, third indoor heat exchanger of first type indoor unit; A30, third expansion valve of first type indoor unit;

[0070] B, second type indoor unit; B1, the first indoor heat exchanger of the second type indoor unit; B10, the first expansion valve of the second type indoor unit; B2, the second indoor heat exchanger of the second type indoor unit; B20, the second expansion valve of the second type indoor unit; B3, the third indoor heat exchanger of the second type indoor unit; B30, the third expansion valve of the second type indoor unit. DETAILED DESCRIPTION

[0071] The preferred embodiments of the present invention are described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only used to explain the technical principles of the present invention and are not intended to limit the protection scope of the present invention.

[0072] It should be noted that in the description of the present invention, the terms "upper", "lower", "left", "right", "inner", "outer" and the like indicating directions or positional relationships are based on the directions or positional relationships shown in the drawings, which are only for the convenience of description, and do not indicate or imply that the device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be understood as indicating or implying relative importance.

[0073] In addition, it should be noted that in the description of the present invention, unless otherwise clearly specified and limited, the terms "installation", "setting", and "connection" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0074] In order to solve the problem that a home system cannot meet different air conditioning requirements for multiple rooms, this embodiment discloses an air conditioning system, which is specifically a home system, which is mainly used to perform air conditioning for multiple rooms in a home.

[0075] Reference Figure 1 The air conditioning system includes an outdoor unit, a control component and a plurality of indoor units, wherein the plurality of indoor units are respectively arranged in different rooms and the plurality of indoor units are connected to the outdoor unit. The indoor unit and the outdoor unit are connected through four pipes to form a four-pipe structure.

[0076] The multiple indoor units are divided into two categories, namely, first-category indoor units and second-category indoor units. In the present embodiment, the number of indoor units is two. In other words, the number of first-category indoor units and the number of second-category indoor units are both one, and the two indoor units are respectively arranged in two rooms. It can be understood by those skilled in the art that, although the number of indoor units in the present embodiment is two, this is not a limitation of the present invention. Without departing from the principle of the present invention, those skilled in the art may further configure indoor units according to the specific number of rooms in other embodiments, for example, one indoor unit is arranged in each room, or indoor units are arranged in some rooms. These modifications do not deviate from the basic principle of the present invention and therefore fall within the protection scope of the present invention.

[0077] The outdoor unit includes a compressor 2 and an outdoor heat exchanger 1. The outdoor heat exchanger 1 is also connected to the fourth pipeline 404. In the present embodiment, the compressor 2 is a double-suction compressor 2, in other words, the compressor 2 is provided with a first air intake port 201, a second air intake port 202 and an exhaust port 203. The compressor 2 can drive the refrigerant to enter from the first air intake port 201 and the second air intake port 202, and to be discharged from the exhaust port 203. This double-suction compressor 2 facilitates the control of the flow direction of the refrigerant flowing through the heat exchanger. In other embodiments, a single-suction compressor 2 can be used in conjunction with a reversing valve to control the flow direction of the refrigerant flowing through the heat exchanger.

[0078] Reference Figure 1 and Figure 2 , the indoor unit includes a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger. The first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are arranged in sequence according to the wind direction. In other words, the airflow entering the indoor unit passes through the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger in sequence and then is discharged. The first side of the first indoor heat exchanger of the multiple indoor units is connected in parallel to one end of the first pipeline 401; the first side of the second indoor heat exchanger of the multiple indoor units is connected in parallel to one end of the second pipeline 402, and the second air intake 202 is connected to the other end of the second pipeline 402; the first side of the third indoor heat exchanger of the multiple indoor units is connected in parallel to the third pipeline 403, and the exhaust port 203 is connected to the other end of the third pipeline 403; the second side of the first indoor heat exchanger, the second side of the second indoor heat exchanger, and the second side of the third indoor heat exchanger are connected in parallel to one end of the fourth pipeline 404, and the outdoor heat exchanger 1 is connected to the other end of the fourth pipeline 404.

[0079] The control assembly includes a four-way valve 301 , a branch control valve 302 , a first control valve 303 , a second control valve 304 , a third control valve 305 , a fourth control valve 306 , a first expansion valve, a second expansion valve, a third expansion valve and a fourth expansion valve 307 .

[0080] The first interface of the four-way valve 301 is connected to the first air intake port 201, the second interface is connected to the other end of the first pipeline 401, the third interface is connected to the outdoor heat exchanger 1 and the second air intake port 202, and the fourth interface is connected to the exhaust port 203. The four-way valve 301 has two connection states. The first connection state is: the first interface is connected to the second interface, and the third interface is connected to the fourth interface. The first connection state enables the first air intake port 201 to be connected to the first indoor heat exchanger through the first pipeline 401, and the outdoor heat exchanger 1 and the second air intake port 202 are both connected to the exhaust port 203. In other words, the first indoor heat exchanger is the low-pressure side of the refrigeration system and operates in an evaporator mode; the outdoor heat exchanger 1 is the high-pressure side of the refrigeration system and operates in a condenser mode. The second connection state is: the first interface is connected to the third interface, and the second interface is connected to the fourth interface. The second connection state makes the outdoor heat exchanger 1 and the second air intake port 202 connected to the first air intake port 201, and the first indoor heat exchanger is connected to the exhaust port 203 through the first pipeline 401. In other words, the first indoor heat exchanger is the high-pressure side of the refrigeration system and operates as a condenser; the outdoor heat exchanger 1 is the low-pressure side of the refrigeration system and operates as an evaporator. The four-way valve 301 can be set to one of the above two connection states, and can also be switched to another connection state.

[0081] Specifically, the third interface of the four-way valve 301 is connected to the first branch 501, the outdoor heat exchanger 1 is connected to the second branch 502, the second air intake port 202 is connected to the third branch 503, and the first branch 501, the second branch 502 and the third branch 503 are connected at one place. In other words, the first branch 501, the second branch 502 and the third branch 503 form a three-way pipeline. The branch control valve 302 is arranged on the third branch 503, and the branch control valve 302 can adjust the opening, and the branch control valve 302 can control the refrigerant flow through the third branch 503.

[0082] The first control valve 303 is disposed on the first pipeline 401 between the second interface and the plurality of first indoor heat exchangers, and the first control valve 303 can adjust the opening to control the refrigerant flow through the first pipeline 401. Since the first indoor heat exchangers are all connected to the first pipeline 401, the first control valve 303 can control the refrigerant flow through the first indoor heat exchanger. The first control valve 303 is specifically a stop valve, in other words, the first control valve 303 can close the first pipeline 401 so that the first indoor heat exchangers of each indoor unit are all closed.

[0083] The second control valve 304 is disposed on the second pipeline 402 between the second air inlet 202 and the plurality of second indoor heat exchangers. The second control valve 304 can adjust the opening to control the refrigerant flow through the second pipeline 402. Since the second indoor heat exchangers are all connected to the second pipeline 402, the second control valve 304 can control the refrigerant flow through the second indoor heat exchanger. The second control valve 304 is specifically a stop valve. In other words, the second control valve 304 can close the second pipeline 402 so that the second indoor heat exchangers of each indoor unit are all closed.

[0084] The third control valve 305 is disposed on the third pipeline 403 between the exhaust port 203 and the plurality of third indoor heat exchangers. The third control valve 305 can adjust the opening to control the refrigerant flow through the third pipeline 403. Since the third indoor heat exchangers are all connected to the third pipeline 403, the third control valve 305 can control the refrigerant flow through the third indoor heat exchanger. The third control valve 305 is specifically a stop valve. In other words, the third control valve 305 can close the third pipeline 403 so that the third indoor heat exchangers of each indoor unit are all closed.

[0085] The fourth control valve 306 is disposed on the fourth pipeline 404 between the outdoor heat exchanger 1 and the first plurality of indoor heat exchangers, the second plurality of indoor heat exchangers, and the third plurality of indoor heat exchangers, and the fourth control valve 306 can adjust the opening to control the flow of the refrigerant flowing through the fourth pipeline 404. The fourth control valve 306 is specifically a stop valve, and the fourth control valve 306 is disposed on the fourth pipeline 404 between the outdoor heat exchanger 1 and the indoor unit, so the fourth control valve 306 can close the fourth pipeline 404, thereby preventing the refrigerant on the outdoor heat exchanger 1 side from flowing into the indoor unit, or preventing the refrigerant on the indoor unit side from flowing into the outdoor heat exchanger 1.

[0086] The first expansion valve is arranged between the first indoor heat exchanger and the fourth pipeline 404, the second expansion valve is arranged between the second indoor heat exchanger and the fourth pipeline 404, the third expansion valve is arranged between the third indoor heat exchanger and the fourth pipeline 404, and the fourth expansion valve 307 is arranged between the outdoor heat exchanger 1 and the fourth pipeline 404. The first expansion valve, the second expansion valve, the third expansion valve and the fourth expansion valve 307 can all adjust the opening to adjust the refrigerant flow through the corresponding heat exchanger. Adjusting the refrigerant flow can change the refrigeration capacity of the heat exchanger. When the refrigeration capacity of the heat exchanger as an evaporator is improved, it can be used for dehumidification. The expansion valve can also enter a closed state to close the corresponding heat exchanger.

[0087] The air conditioning system can control the working state of each heat exchanger through the control component, so that the air conditioning system has multiple operating modes. The following introduces the 11 operating modes of the air conditioning system.

[0088] Reference Figure 3, the first operating mode is that both indoor units are cooling.

[0089] The control components in this operating mode are set to the following states: the four-way valve 301 is set to the first connection state, the first control valve 303, the second control valve 304, and the fourth control valve 306 are in the open state, and the third control valve 305 and the branch control valve 302 are in the closed state.

[0090] In this operating mode, the working status of the heat exchanger is as follows: the outdoor heat exchanger 1 acts as a condenser to release heat; the first indoor heat exchanger A1 and the second indoor heat exchanger A2 of the first type indoor unit A act as evaporators to absorb heat, and the third indoor heat exchanger A3 is turned off; the working mode of the second type indoor unit B is the same as the working mode of the first type indoor unit A.

[0091] The working principle of this operation mode is: both indoor units absorb heat from the air through the first indoor heat exchanger (A1 and B1) and the second indoor heat exchanger (A2 and B2) to achieve a cooling effect.

[0092] Reference Figure 4 , the second operation mode is that both indoor units perform dehumidification.

[0093] The control components in this operation mode are set to the following states: the four-way valve 301 is set to the first connection state, the first control valve 303, the second control valve 304, and the fourth control valve 306 are in the open state, and the third control valve 305 and the branch control valve 302 are in the closed state. The difference between this operation mode and the first operation mode is that the refrigeration capacity of the second indoor heat exchanger (A2 and B2) is enhanced by adjusting the opening of the second expansion valve (A10 and B20).

[0094] The working state of the heat exchanger in this operation mode is as follows: the outdoor heat exchanger 1 releases heat as a condenser; the first indoor heat exchanger A1 and the second indoor heat exchanger of the first type indoor unit A absorb heat as evaporators, and by adjusting the opening of the second expansion valve A20, the cooling capacity of the second indoor heat exchanger A2 is enhanced so that the second indoor heat exchanger A2 can dehumidify, and the third indoor heat exchanger A3 is closed. The working mode of the second type indoor unit B is the same as that of the first type indoor unit A.

[0095] The working principle of this operation mode is: the air entering the indoor unit is first cooled by the first indoor heat exchanger (A1 and B1) and then dehumidified by the second indoor heat exchanger (A2 and B2), thereby reducing the indoor air humidity.

[0096] Reference Figure 5 ,The third operating mode is that both indoor units perform constant temperature dehumidification.

[0097] The control components in this operation mode are set to the following states: the four-way valve 301 is set to the first connection state, the first control valve 303, the second control valve 304, and the third control valve 305 are in the open state, and the fourth control valve 306 and the branch control valve 302 are in the closed state. By adjusting the opening of the second expansion valve (A20 and B20), the cooling capacity of the second indoor heat exchanger (A2 and B2) is enhanced.

[0098] The working status of the heat exchanger in this operating mode is as follows: the outdoor heat exchanger 1 is in the closed state; the first indoor heat exchanger A1 and the second indoor heat exchanger A2 of the first type indoor unit A both absorb heat as evaporators, and by adjusting the opening of the second expansion valve A10, the refrigeration capacity of the second indoor heat exchanger A2 is enhanced so that the second indoor heat exchanger A2 can dehumidify; the third indoor heat exchanger A3 of the first type indoor unit A releases heat as a condenser; the working mode of the second type indoor unit B is the same as that of the first type indoor unit A.

[0099] The working principle of this operation mode is as follows: the air entering the indoor unit first passes through the first indoor heat exchanger (A1 and B1) for pre-cooling; then passes through the second indoor heat exchanger (A2 and B2) with stronger cooling capacity to condense the moisture in the air, thereby reducing the humidity of the indoor air; finally, it passes through the third indoor heat exchanger (A3 and B3) for heating, so that the temperature of the dehumidified air rises, thereby achieving the effect of constant temperature dehumidification.

[0100] Reference Figure 6 ,The fourth operation mode is that both indoor units perform heating and dehumidification.

[0101] The control components in this operating mode are set to the following states: the four-way valve 301 is set to the second connection state, the second control valve 304, the third control valve 305, and the fourth control valve 306 are in the open state, and the first control valve 303 and the branch control valve 302 are in the closed state.

[0102] The working status of the heat exchanger in this operating mode is as follows: the outdoor heat exchanger 1 acts as an evaporator; the first indoor heat exchanger A1 of the first type indoor unit A is in a closed state, the second indoor heat exchanger A2 acts as an evaporator, and by adjusting the opening of the second expansion valve A20, the refrigeration capacity of the second indoor heat exchanger A2 is enhanced so that the second indoor heat exchanger A2 can dehumidify; the third indoor heat exchanger A3 acts as a condenser; the working mode of the second type indoor unit B is the same as the working mode of the first type indoor unit A.

[0103] The working principle of this operation mode is: the air entering the indoor unit first passes through the second indoor heat exchanger (A2 and B2) for cooling and dehumidification, and then passes through the third indoor heat exchanger (A3 and B3) for heating and then discharge, so that the dehumidified air is heated and heated. The difference between this operation mode and the third operation mode is that the indoor air is not pre-cooled by the first indoor heat exchanger (A1 and B1), so that the third indoor heat exchanger (A3 and B3) can heat the cooled and dehumidified air to a higher temperature, thereby achieving the effect of heating and dehumidification.

[0104] Reference Figure 7 , the fifth operation mode is that both indoor units perform rapid heating.

[0105] The control components in this operating mode are set to the following states: the four-way valve 301 is set to the second connection state, the first control valve 303, the third control valve 305, the fourth control valve 306, and the branch control valve 302 are all in the open state, and the second control valve 304 is in the closed state.

[0106] In this operation mode, the working state of the heat exchanger is as follows: the outdoor heat exchanger 1 acts as an evaporator; the second indoor heat exchanger A2 of the first type indoor unit A is in a closed state, and the first indoor heat exchanger A1 and the third indoor heat exchanger A3 act as condensers. The working mode of the second type indoor unit B is the same as that of the first type indoor unit A.

[0107] The working principle of this operation mode is that the air entering the indoor unit is heated by the first indoor heat exchanger (A1 and B1) and the third indoor heat exchanger (A3 and B3), thereby achieving a rapid heating effect.

[0108] Reference Figure 8 ,The sixth operation mode is that both indoor units perform energy-saving heating.

[0109] The control components in this operating mode are set to the following states: the four-way valve 301 is set to the second connection state, the first control valve 303, the fourth control valve 306, and the branch control valve 302 are in the open state, and the second control valve 304 and the third control valve 305 are in the closed state.

[0110] The working status of the heat exchanger in this operating mode is as follows: the outdoor heat exchanger 1 serves as an evaporator; the first indoor heat exchanger A1 of the first type indoor unit A serves as a condenser, and the second indoor heat exchanger A2 and the third indoor heat exchanger A3 are both in the closed state; the working mode of the second type indoor unit B is the same as the working mode of the first type indoor unit A.

[0111] The working principle of this operation mode is that the indoor unit can heat the indoor air only through the first indoor heat exchanger (A1 and B1), thereby achieving the heating effect. The difference between this operation mode and the fifth operation mode is that the air is heated only through the first indoor heat exchanger (A1 and B1), the heating efficiency is lower, but it saves more energy.

[0112] Reference Fig. 9 The seventh operation mode is the non-stop defrosting mode, which is mainly used to remove frost generated on the outdoor heat exchanger in the heating mode.

[0113] The control components in this operation mode are set to the following states: the four-way valve 301 is set to the first connection state, the first control valve 303, the second control valve 304, the third control valve 305, and the fourth control valve 306 are all in the open state, and the branch control valve 302 is in the closed state. The third expansion valve A30 of the first type indoor unit A and the first expansion valve B10 and the second expansion valve B20 of the second type indoor unit B are all closed, so that the third indoor heat exchanger A3 of the first type indoor unit A and the first heat exchanger and the second heat exchanger of the second type indoor unit B are all closed.

[0114] The working status of the heat exchanger in this operation mode is as follows: the outdoor heat exchanger 1 acts as a condenser; the first indoor heat exchanger A1 and the second indoor heat exchanger A2 of the first type indoor unit A both act as evaporators, and by adjusting the opening of the second expansion valve A20, the cooling capacity of the second indoor heat exchanger A2 is enhanced so that the second indoor heat exchanger A2 can perform dehumidification; the third indoor heat exchanger A3 is turned off. The first indoor heat exchanger B1 and the second indoor heat exchanger B2 of the second type indoor unit B are both turned off, and the third indoor heat exchanger B3 acts as a condenser.

[0115] The working principle of this operation mode is: the outdoor heat exchanger 1 releases heat as a condenser, thereby melting the frost on the outdoor heat exchanger 1. In addition, the second type indoor unit B can continue to heat, thereby removing the frost on the outdoor heat exchanger 1 without stopping.

[0116] Reference Fig.10 ,The eighth operation mode is that one indoor unit performs cooling and the other indoor unit performs reheat dehumidification.

[0117] The control components in this operation mode are set to the following states: the four-way valve 301 is set to the first connection state, the first control valve 303, the second control valve 304, the third control valve 305, and the fourth control valve 306 are in the open state, and the branch control valve 302 is in the closed state. In addition, the second expansion valve A20, the third expansion valve A30 of the first type indoor unit A and the first expansion valve B10 of the second type indoor unit B are all closed, so that the second indoor heat exchanger A2, the third indoor heat exchanger A3 of the first type indoor unit A and the first indoor heat exchanger B1 of the second type indoor unit B are all closed.

[0118] The working status of the heat exchanger in this operating mode is as follows: the outdoor heat exchanger 1 acts as a condenser; the first indoor heat exchanger A1 of the first type indoor unit A acts as an evaporator, and the second indoor heat exchanger A2 and the third indoor heat exchanger A3 are both closed; the first indoor heat exchanger B1 of the second type indoor unit B is closed, the second indoor heat exchanger B2 acts as an evaporator, and by adjusting the opening of the second expansion valve B20, the cooling capacity of the second indoor heat exchanger B2 is enhanced so that the second indoor heat exchanger B2 can be dehumidified, and the third indoor heat exchanger B3 acts as a condenser.

[0119] The working principle of this operation mode is: the first type of indoor unit A performs cooling through the first indoor heat exchanger A1 as an evaporator; the second type of indoor unit B performs cooling and dehumidification through the second indoor heat exchanger B2, and the third indoor heat exchanger B3 heats the dehumidified air, thereby achieving the effect of heating the air again after dehumidification.

[0120] Reference Fig.11 ,The ninth operation mode is that one indoor unit performs dehumidification and the other indoor unit performs reheat dehumidification.

[0121] The control components in this operation mode are set to the following states: the four-way valve 301 is set to the first connection state, the first control valve 303, the second control valve 304, the third control valve 305, and the fourth control valve 306 are all in the open state, and the branch control valve 302 is in the closed state. The third expansion valve A30 of the first type indoor unit A and the first expansion valve B10 of the second type indoor unit B are both closed, so that the third indoor heat exchanger A3 of the first type indoor unit A and the first indoor heat exchanger B1 of the second type indoor unit B are both closed.

[0122] The working status of the heat exchanger in this operating mode is as follows: the outdoor heat exchanger 1 serves as a condenser; the first indoor heat exchanger A1 and the second indoor heat exchanger A2 of the first type indoor unit A both serve as evaporators, and by adjusting the opening of the second expansion valve A20, the refrigeration capacity of the second indoor heat exchanger A2 is enhanced so that the second indoor heat exchanger A2 can be dehumidified, and the third indoor heat exchanger A3 is closed; the first indoor heat exchanger B1 of the second type indoor unit B is closed, and the second indoor heat exchanger B2 both serve as evaporators, and by adjusting the opening of the second expansion valve B20, the refrigeration capacity of the second indoor heat exchanger B2 is enhanced so that the second indoor heat exchanger B2 can be dehumidified, and the third indoor heat exchanger B3 serves as a condenser.

[0123] The working principle of this operation mode is as follows: the air entering the first type indoor unit A is first pre-cooled by the first indoor heat exchanger A1, and then cooled and dehumidified by the second indoor heat exchanger A2, thereby realizing the dehumidification function of the first type indoor unit A. The air entering the second type indoor unit B is first cooled and dehumidified by the second indoor heat exchanger B2, and then heated by the third indoor heat exchanger B3, thereby realizing the reheating and dehumidification function of the second type indoor unit B.

[0124] Reference Fig.12 , the tenth operating mode is that one indoor unit performs reheating and dehumidification, and the other indoor unit performs heating.

[0125] The control components in this operation mode are set to the following states: the four-way valve 301 is set to the second connection state, the second control valve 304, the third control valve 305, and the fourth control valve 306 are all in the open state, and the first control valve 303 and the branch control valve 302 are all in the closed state. The first expansion valve A10 of the first type indoor unit A and the first expansion valve B10 and the second expansion valve B20 of the second type indoor unit B are closed, so that the first indoor heat exchanger A1 of the first type indoor unit A and the first indoor heat exchanger B1 and the second indoor heat exchanger B2 of the second type indoor unit B are closed.

[0126] The working status of the heat exchanger in this operating mode is as follows: the outdoor heat exchanger 1 serves as an evaporator; the first indoor heat exchanger A1 of the first type indoor unit A is closed, and the second indoor heat exchanger A2 serves as an evaporator, and by adjusting the opening of the second expansion valve A20, the cooling capacity of the second indoor heat exchanger A2 is enhanced so that the second indoor heat exchanger A2 can perform dehumidification, and the third indoor heat exchanger A3 serves as a condenser; the first indoor heat exchanger B1 and the second indoor heat exchanger B2 of the second type indoor unit B are closed, and the third indoor heat exchanger B3 serves as a condenser.

[0127] The working principle of this operation mode is as follows: the air entering the first type indoor unit A is first cooled and dehumidified by the second indoor heat exchanger A2, and then heated by the third indoor heat exchanger A3, thereby realizing the reheating and dehumidification function of the first type indoor unit A. The air entering the second type indoor unit B is heated by the third indoor heat exchanger B3, thereby realizing the heating function of the second type indoor unit B.

[0128] Reference Fig.13 , the eleventh operation mode is that one indoor unit performs dehumidification and the other indoor unit performs heating.

[0129] The control components in this operation mode are set to the following states: the four-way valve 301 is set to the first connection state, the first control valve 303, the second control valve 304, and the third control valve 305 are in the open state, and the fourth control valve 306 and the branch control valve 302 are in the closed state. The third expansion valve A30 of the first type indoor unit A and the first expansion valve B10 and the second expansion valve B20 of the second type indoor unit B are closed, so that the third indoor heat exchanger A3 of the first type indoor unit A and the first indoor heat exchanger B1 and the second indoor heat exchanger B2 of the second type indoor unit B are closed.

[0130] The working status of the heat exchanger in this operating mode is as follows: the outdoor heat exchanger 1 is turned off; the first indoor heat exchanger A1 and the second indoor heat exchanger A2 of the first type indoor unit A are both used as evaporators, and by adjusting the opening of the second expansion valve A20, the refrigeration capacity of the second indoor heat exchanger A2 is enhanced so that the second indoor heat exchanger A2 can perform dehumidification, and the third indoor heat exchanger A3 is turned off; the first indoor heat exchanger B1 and the second indoor heat exchanger B2 of the second type indoor unit B are both turned off, and the third indoor heat exchanger B3 is used as a condenser.

[0131] The working principle of this operation mode is as follows: the air entering the first type indoor unit A is first pre-cooled by the first indoor heat exchanger A1, and then cooled and dehumidified by the second indoor heat exchanger A2, thereby realizing the dehumidification function of the first type indoor unit A. The air entering the second type indoor unit B is heated by the third indoor heat exchanger B3, thereby realizing the heating effect of the second type indoor unit B.

[0132] In summary, the control component of the present invention can control the working state of the outdoor heat exchanger 1 and the three indoor heat exchangers in each indoor unit. Specifically, the indoor heat exchanger can be used as a condenser, an evaporator, or turned off, the first indoor heat exchanger can also be used as a condenser, an evaporator, or turned off, the second indoor heat exchanger can be used as an evaporator or turned off, and the third indoor heat exchanger can be used as a condenser or turned off. By combining the working states of the three indoor heat exchangers in each indoor unit, the indoor unit can have multiple operating states.

[0133] Furthermore, since the control component can independently control the working state of the three indoor heat exchangers in each indoor unit, and the air conditioning system of the outdoor heat exchanger 1 and at least two indoor heat exchangers can realize the operation mode of shutting down one of them, each indoor unit of the air conditioning system can adopt a different operation mode. When multiple indoor units are respectively arranged in different rooms, different air conditioning requirements of multiple rooms can be met.

[0134] So far, the technical solutions of the present invention have been described in conjunction with the preferred embodiments shown in the accompanying drawings. However, it is easy for those skilled in the art to understand that the protection scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, those skilled in the art can make equivalent changes or substitutions to the relevant technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims

1. An air conditioning system, characterized in that: It comprises an outdoor heat exchanger (1), a compressor (2), a control component and at least two indoor units; The indoor unit includes a first indoor heat exchanger, a second indoor heat exchanger and a third indoor heat exchanger; The first indoor heat exchanger and the outdoor heat exchanger (1) are both connected to the compressor (2) via the control component, and the control component is capable of controlling any one of the first indoor heat exchanger and the outdoor heat exchanger (1) to act as a condenser and the other to act as an evaporator; The second indoor heat exchanger is connected to the air intake port of the compressor (2) via a control component so that the second indoor heat exchanger can function as an evaporator; The third indoor heat exchanger is connected to the exhaust port (203) of the compressor (2) through a control component, so that the third indoor heat exchanger can serve as a condenser; The control component can also shut down any one or more of the indoor unit, the first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger; The control component can also control the heat absorption capacity of the second indoor heat exchanger as an evaporator, so that the second indoor heat exchanger can absorb heat and dehumidify.

2. The air conditioning system according to claim 1, characterized in that: The compressor (2) is provided with a first air intake port (201), a second air intake port (202) and an air discharge port (203); The control component comprises a four-way valve (301), and a first interface of the four-way valve (301) is connected to the first air inlet (201); The first sides of the plurality of first indoor heat exchangers are connected in parallel to one end of the first pipeline (401), and the second interface of the four-way valve is connected to the other end; The third interface of the four-way valve is connected to the outdoor heat exchanger (1) and the second air intake port (202); The fourth interface of the four-way valve is connected to the exhaust port (203); Controlling the four-way valve (301) enables the first air intake port (201) to be connected to the first pipeline (401), and enables the outdoor heat exchanger (1) and the second air intake port (202) to be connected to the exhaust port (203), so that the first indoor heat exchanger serves as an evaporator and the outdoor heat exchanger (1) serves as a condenser; Controlling the four-way valve (301) can also enable the first air intake port (201) to be connected to the outdoor heat exchanger (1) and the second air intake port (202), and the first pipeline (401) to be connected to the exhaust port (203), so that the first indoor heat exchanger acts as a condenser and the outdoor heat exchanger (1) acts as an evaporator.

3. The air conditioning system according to claim 2, characterized in that: The third interface is connected to the first branch (501), the outdoor heat exchanger (1) is connected to the second branch (502), the second air intake port (202) is connected to the third branch (503), and the first branch (501), the second branch (502) and the third branch (503) are connected at one point; The control component also includes a branch control valve (302), which is arranged on the third branch (503), and the branch control valve (302) is capable of controlling the flow of refrigerant flowing through the third branch (503).

4. The air conditioning system according to claim 2, characterized in that: The control assembly further comprises a first control valve (303), wherein the first control valve (303) is arranged on the first pipeline (401), and the first control valve (303) is capable of controlling the flow rate of the refrigerant flowing through the first indoor heat exchanger; and / or The first sides of the plurality of second indoor heat exchangers are connected in parallel to one end of the second pipeline (402), and the second air intake port (202) is connected to the other end, and the control component further comprises a second control valve (304), the second control valve (304) is arranged on the second pipeline (402), and the second control valve (304) is capable of controlling the flow of refrigerant flowing through the second indoor heat exchanger; and / or The first sides of the plurality of third indoor heat exchangers are connected in parallel to one end of a third pipeline (403), the exhaust port (203) is connected to the other end, the control component further comprises a third control valve (305), the third control valve (305) is arranged on the third pipeline (403), and the third control valve (305) is capable of controlling the flow of refrigerant flowing through the third indoor heat exchanger; and / or The outdoor heat exchanger (1) is connected to one end of a fourth pipeline (404), and the second sides of the plurality of first indoor heat exchangers, the second sides of the plurality of second indoor heat exchangers, and the second sides of the plurality of third indoor heat exchangers are all connected to the other end of the fourth pipeline (404). The control component also includes a fourth control valve (306), and the fourth control valve (306) is arranged on the fourth pipeline (404). The fourth control valve (306) can control the flow of refrigerant flowing through the fourth pipeline (404).

5. The air conditioning system according to claim 4, characterized in that: A first expansion valve is provided between the first indoor heat exchanger and the fourth pipeline (404); and / or A second expansion valve is provided between the second indoor heat exchanger and the fourth pipeline (404); and / or A third expansion valve is provided between the third indoor heat exchanger and the fourth pipeline (404); and / or A fourth expansion valve (307) is provided between the outdoor heat exchanger (1) and the fourth pipeline (404).

6. The air conditioning system according to claim 1, characterized in that: The first indoor heat exchanger, the second indoor heat exchanger and the third indoor heat exchanger are arranged in sequence according to wind direction.

7. A method for controlling an air conditioning system, characterized in that: The air conditioning system is an air conditioning system according to any one of claims 1 to 6, the plurality of indoor unit groups are divided into first-type indoor unit groups and second-type indoor unit groups, and the control method includes the following operation modes: The outdoor heat exchanger acts as a condenser to release heat; The first indoor heat exchanger of the first type indoor unit acts as an evaporator to absorb heat, and at least one of the second indoor heat exchanger and the third indoor heat exchanger is turned off, so that the first type indoor unit can perform cooling; The first indoor heat exchanger of the second type indoor unit is closed, the second indoor heat exchanger acts as an evaporator to absorb heat and dehumidify, and the third indoor heat exchanger acts as a condenser to release heat, so that the second type indoor unit can reheat and dehumidify.

8. The control method according to claim 7, characterized in that: The control method also includes the following operating modes: The outdoor heat exchanger acts as a condenser to release heat; The first indoor heat exchanger of the first type of indoor unit acts as an evaporator to absorb heat, the second indoor heat exchanger acts as an evaporator to absorb heat and dehumidify, and the third indoor heat exchanger is turned off so that the first type of indoor unit can dehumidify; The first indoor heat exchanger and the second indoor heat exchanger of the second type indoor unit are both turned off, and the third indoor heat exchanger acts as a condenser to release heat, so that the second type indoor unit can generate heat.

9. The control method according to claim 7, characterized in that: The control method also includes the following operating modes: The outdoor heat exchanger acts as an evaporator to absorb heat; The first indoor heat exchanger of the first type of indoor unit is turned off, the second indoor heat exchanger acts as an evaporator to absorb heat and dehumidify, and the third indoor heat exchanger acts as a condenser to release heat, so that the first type of indoor unit can reheat and dehumidify; The first indoor heat exchanger and the second indoor heat exchanger of the second type indoor unit are both turned off, and the third indoor heat exchanger acts as a condenser to release heat, so that the second type indoor unit can generate heat.

10. The control method according to claim 7, characterized in that: The control method also includes the following operating modes: The outdoor heat exchanger is closed; The first indoor heat exchanger of the first type of indoor unit acts as an evaporator to absorb heat, the second indoor heat exchanger acts as an evaporator to absorb heat and dehumidify, and the third indoor heat exchanger is turned off so that the first type of indoor unit can dehumidify; The first indoor heat exchanger and the second indoor heat exchanger of the second type indoor unit are both turned off, and the third indoor heat exchanger acts as a condenser to release heat, so that the second type indoor unit can generate heat.

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