CN213272815U - Air conditioning system - Google Patents

Abstract

The utility model relates to an air conditioning technology field specifically provides an air conditioning system, aims at solving current direct expansion formula air conditioning unit and needs two off-premises stations just to carry out dehumidification and intensification, the complicated, with high costs problem of structure. For this purpose, the air conditioning system of the utility model comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a cooling and dehumidifying heat exchanger and a heating heat exchanger; the outdoor unit comprises a compressor and an outdoor heat exchanger, wherein the air outlet end of the compressor is respectively communicated with the inlet end of the heating heat exchanger and the first end of the outdoor heat exchanger through a first four-way valve and a second four-way valve; the outlet end of the heating heat exchanger and the second end of the outdoor heat exchanger are communicated with the inlet end of the cooling dehumidifying heat exchanger, a first throttling element is arranged between the outlet end of the heating heat exchanger and the inlet end of the cooling dehumidifying heat exchanger, a second throttling element is arranged between the second end of the outdoor heat exchanger and the inlet end of the cooling dehumidifying heat exchanger, and the purposes of dehumidifying and heating air can be achieved by one outdoor unit.

Description

Air conditioning system

Technical Field

The utility model relates to an air conditioning technology field specifically provides an air conditioning system.

Background

The direct expansion type air conditioning unit integrates the combined air conditioning box and the direct expansion air conditioning technology, can realize the integrated control of the air refrigeration and heating centralized regulation, adopts the direct heat exchange of the refrigerant and the air, has the characteristics of high efficiency, energy conservation, simple system, stable performance, compact structure and the like, and is more and more favored by the market.

In order to meet the requirement of a user on the humidity of fresh air, a direct-expansion air conditioning unit usually adopts a cooling and dehumidifying mode to dehumidify the fresh air, and in the dehumidifying process, the fresh air exchanges heat with a low-temperature heat exchanger to liquefy water vapor in the fresh air into liquid water to be discharged; because the air temperature after the dehumidification is too low, if directly send the air after the dehumidification into indoor, can let the people feel uncomfortable, consequently, increased the temperature of heating section in order to improve the air after the dehumidification behind the dehumidification section, wherein, be provided with electric auxiliary heating equipment and a high temperature heat exchanger in the heating section. In the process, two outdoor units are needed, one outdoor unit provides a cold source, and the other outdoor unit provides a heat source, so that the whole system is complex in structure, high in foundation cost and complex to install; and the refrigeration and heating outdoor units operate simultaneously, which causes energy waste, and has high energy consumption and high operation cost.

Therefore, there is a need in the art for a new air conditioning system that addresses the above-mentioned problems.

SUMMERY OF THE UTILITY MODEL

In order to solve the above problems in the prior art, that is, to solve the problems of complicated structure and high cost that the existing direct expansion air conditioning unit requires two outdoor units to dehumidify and heat the air, the utility model provides an air conditioning system, which comprises an indoor unit and an outdoor unit, wherein the indoor unit comprises a box body, the box body is provided with an air inlet and an air outlet, the box body is internally provided with a cooling and dehumidifying section and a heating section along the air flowing direction, the cooling and dehumidifying section is provided with a cooling and dehumidifying heat exchanger, and the heating section is provided with a heating heat exchanger; the outdoor unit comprises a shell, and a compressor, an outdoor heat exchanger, a first four-way valve and a second four-way valve which are arranged in the shell, wherein three interfaces of the first four-way valve are respectively communicated with an exhaust port end of the compressor, an air return port end of the compressor and an inlet end of the heating heat exchanger; three interfaces of the second four-way valve are respectively communicated with the exhaust port end of the compressor, the air return port end of the compressor and the first end of the outdoor heat exchanger; the outlet end of the heating heat exchanger and the second end of the outdoor heat exchanger are both communicated with the inlet end of the cooling dehumidifying heat exchanger, a first throttling element is arranged between the outlet end of the heating heat exchanger and the inlet end of the cooling dehumidifying heat exchanger, and a second throttling element is arranged between the second end of the outdoor heat exchanger and the inlet end of the cooling dehumidifying heat exchanger; and the outlet end of the cooling and dehumidifying heat exchanger is communicated with the air return port end of the compressor.

In a preferred technical solution of the above air conditioning system, an outlet end of the heating heat exchanger is communicated with a second end of the outdoor heat exchanger, and a third throttling element is disposed between the outlet end of the heating heat exchanger and the second end of the outdoor heat exchanger.

In the preferable technical scheme of the air conditioning system, the outdoor unit further comprises a first three-way pipe; the first end of the first three-way pipe is communicated with the exhaust port end of the compressor, the second end of the first three-way pipe is communicated with the first interface of the first four-way valve, and the third end of the first three-way pipe is communicated with the first interface of the second four-way valve.

In a preferred technical solution of the above air conditioning system, the air conditioning system further includes a first valve box and a second valve box, wherein three inlets of the first valve box and the second valve box are respectively communicated with the second interface of the first four-way valve, the second end of the outdoor heat exchanger, and the air return port end of the compressor; two outlets of the first valve box are respectively communicated with the inlet end and the outlet end of the heating heat exchanger; and two outlets of the second valve box are respectively communicated with the inlet end and the outlet end of the cooling and dehumidifying heat exchanger.

In a preferred technical solution of the air conditioning system, each of the first valve box and the second valve box includes a box body, and a first electronic expansion valve and a second electronic expansion valve that are disposed in the box body, wherein a first inlet of the box body is communicated with a first outlet of the box body through a first pipeline, and the first electronic expansion valve is disposed on the first pipeline; the second inlet of the box body is communicated with the first outlet through a second pipeline, and the second electronic expansion valve is arranged on the second pipeline; and the third inlet of the box body is communicated with the second outlet of the box body through a third pipeline.

In the preferable technical scheme of the above air conditioning system, the first valve box and the second valve box further include a heat exchanger and a third electronic expansion valve which are arranged in the box body, wherein the heat exchanger is matched with the third pipeline, a first end of the heat exchanger is communicated with the second inlet through a first connecting pipeline, a second end of the heat exchanger is communicated with the third pipeline through a second connecting pipeline, and the third electronic expansion valve is arranged on the second connecting pipeline.

In a preferred technical solution of the above air conditioning system, the number of the outdoor heat exchangers is plural, and the plural outdoor heat exchangers are arranged in parallel.

In a preferred embodiment of the above air conditioning system, the outdoor unit includes a plurality of second four-way valves, and three ports of each of the second four-way valves are respectively communicated with the discharge port end of the compressor, the air return port end of the compressor, and the first end of one of the outdoor heat exchangers.

In the preferred technical scheme of the air conditioning system, the box body is also respectively provided with a mixing section and an air supply section, the air inlet is arranged in the mixing section, the air outlet is arranged in the air supply section, and the air supply section is internally provided with a fan; the cooling dehumidification section with the heating section sets gradually along the air flow direction mix the section with between the air supply section.

In the preferable technical scheme of the air conditioning system, a filtering section is further arranged between the mixing section and the cooling and dehumidifying section, and a filtering component is arranged in the filtering section.

As can be understood by those skilled in the art, in the preferred technical solution of the present invention, the air conditioning system includes an indoor unit and an outdoor unit, the indoor unit includes a box body, the box body is provided with an air inlet and an air outlet, a cooling and dehumidifying section and a heating section are arranged in the box body along the air flowing direction, the cooling and dehumidifying section is provided with a cooling and dehumidifying heat exchanger, and the heating section is provided with a heating heat exchanger; the outdoor unit comprises a shell, and a compressor, an outdoor heat exchanger, a first four-way valve and a second four-way valve which are arranged in the shell, wherein three interfaces of the first four-way valve are respectively communicated with an exhaust port end of the compressor, an air return port end of the compressor and an inlet end of the heating heat exchanger; three of the interfaces of the second four-way valve are respectively communicated with the exhaust port end of the compressor, the air return port end of the compressor and the first end of the outdoor heat exchanger; the outlet end of the heating heat exchanger and the second end of the outdoor heat exchanger are both communicated with the inlet end of the cooling and dehumidifying heat exchanger, a first throttling element is arranged between the outlet end of the heating heat exchanger and the inlet end of the cooling and dehumidifying heat exchanger, and a second throttling element is arranged between the second end of the outdoor heat exchanger and the inlet end of the cooling and dehumidifying heat exchanger; the outlet end of the cooling and dehumidifying heat exchanger is communicated with the air return port end of the compressor.

Compared with the technical proposal that two sets of air conditioning units are needed to dehumidify the air and improve the temperature of the dehumidified air in the prior art, the air conditioning system of the utility model respectively communicates the exhaust port end of the compressor with the inlet end of the heating heat exchanger and the first end of the outdoor heat exchanger, the outlet end of the heating heat exchanger and the second end of the outdoor heat exchanger are both communicated with the inlet end of the cooling and dehumidifying heat exchanger, the outlet end of the cooling and dehumidifying heat exchanger is communicated with the air return port end of the compressor, so that the high-temperature and high-pressure refrigerant flowing out of the compressor is divided into two paths, one path of refrigerant flows into the heating heat exchanger through the first four-way valve to become the normal-temperature and normal-pressure refrigerant, the other path of refrigerant flows into the outdoor heat exchanger through the second four-way valve to become the normal-temperature and normal-pressure refrigerant, the normal-, the normal temperature and normal pressure refrigerant flowing out of the outdoor heat exchanger is throttled and depressurized by the second throttling element to become low-temperature and low-pressure refrigerant and flows into the cooling and dehumidifying heat exchanger, and in the process, the air flowing into the box body from the air inlet of the box body exchanges heat with the low-temperature and low-pressure refrigerant flowing into the cooling and dehumidifying heat exchanger, so that the water vapor in the air is liquefied to become liquid water to be discharged; the dehumidified air exchanges heat with the high-temperature and high-pressure refrigerant flowing into the heating heat exchanger, so that the temperature of the dehumidified air is raised to a preset temperature, the purpose of heating after dehumidification is realized, namely, the purposes of dehumidifying the air and improving the temperature of the dehumidified air can be realized by adopting an outdoor unit, the product structure is simplified, the cost is reduced, and the energy waste is avoided.

Furthermore, the outlet end of the heating heat exchanger is communicated with the second end of the outdoor heat exchanger, a third throttling element is arranged between the outlet end of the heating heat exchanger and the second end of the outdoor heat exchanger, so that the air conditioning system can realize that all high-temperature and high-pressure refrigerants flowing out of the compressor flow into the heating heat exchanger through the first four-way valve to be changed into normal-temperature and normal-pressure refrigerants, the normal-temperature and normal-pressure refrigerants flowing out of the heating heat exchanger are divided into two paths, one path of refrigerants are throttled and depressurized by the third throttling element to be changed into low-temperature and low-pressure refrigerants and flow into the outdoor heat exchanger, the other path of refrigerants are throttled and depressurized by the first throttling element to be changed into low-temperature and low-pressure refrigerants and flow, in the process, air flowing into the box body from the air inlet of the box body exchanges heat with a low-temperature low-pressure refrigerant flowing into the cooling and dehumidifying heat exchanger, so that water vapor in the air is liquefied into liquid water and is discharged; the dehumidified air exchanges heat with the high-temperature and high-pressure refrigerant flowing into the heating heat exchanger, so that the temperature of the dehumidified air is raised to a preset temperature, the purpose of heating the air under a small load after dehumidification is achieved, namely, the purposes of dehumidifying the air and improving the temperature of the dehumidified air can be achieved by adopting an outdoor unit, the product structure is simplified, the cost is reduced, and energy waste is avoided.

Further, the inlet end of the heating heat exchanger is communicated with a second interface of the first four-way valve by using a first valve box, and the outlet end of the heating heat exchanger is respectively communicated with a second end of the outdoor heat exchanger and an air return port end of the compressor; the inlet end of the temperature and humidity removing heat exchanger is communicated with the second end of the outdoor heat exchanger by using a second valve box, and the outlet end of the temperature and humidity removing heat exchanger is respectively communicated with a second interface of the first four-way valve and the air return port end of the compressor; through the exit end that uses first valve box and second valve box to heat exchanger and the entrance point intercommunication of cooling dehumidification heat exchanger, change the flow direction of refrigerant through first valve box and/or second valve box, make the normal atmospheric temperature refrigerant that flows out from heating heat exchanger can divide into two the tunnel and flow to outdoor heat exchanger and cooling dehumidification heat exchanger respectively, also can all flow to cooling dehumidification heat exchanger, make air conditioning system can satisfy different dehumidification and heating demands, and then improved user's use and experienced.

Further, through set up filtering component in the box, dust and particulate matter in the filtered air of can effective filtration guarantee exhaust air quality, have avoided the air to bring dust and particulate matter into indoorly, and then have improved user experience.

Drawings

The air conditioning system of the present invention is described below with reference to the accompanying drawings. In the drawings:

fig. 1 is a structural diagram of an air conditioning system of the present invention;

FIG. 2 is a block diagram of a first valve box of the present invention;

fig. 3 is an operation diagram of a first operation mode of the air conditioning system of the present invention;

fig. 4 is an operation diagram of a second operation mode of the air conditioning system of the present invention;

fig. 5 is an operation diagram of a third operation mode of the air conditioning system of the present invention;

fig. 6 is an operation diagram of a fourth operation mode of the air conditioning system of the present invention;

fig. 7 is an operation diagram of a fifth operation mode of the air conditioning system of the present invention.

List of reference numerals

1. An indoor unit; 11. a box body; 111. an air inlet; 112. an air outlet; 12. a cooling dehumidifying heat exchanger; 13. heating a heat exchanger; 14. a filter assembly; 15. a fan; 16. a heating element; 17. a drain hole;

2. an outdoor unit; 21. a housing; 22. a compressor; 23. an outdoor heat exchanger; 24. a first four-way valve; 25. a second four-way valve; 26. a first three-way pipe; 27. a gas-liquid separator;

3. a first throttling element;

4. a second throttling element;

5. a third throttling element;

6. a first valve box; 61. a box body; 611. a first inlet of the first valve box; 612. a second inlet of the first valve box; 613. a third inlet of the first valve box; 614. a first outlet of the first valve cartridge; 615. a second outlet of the first valve cartridge; 62. a first electronic expansion valve of the first valve box; 63. a second electronic expansion valve of the first valve box; 64. a third electronic expansion valve of the first valve box; 65. a heat exchanger; 651. a heat exchange housing; 652. a heat exchange line; 66. a first pipeline; 67. a second pipeline; 68. a third pipeline; 69. a first connecting line; 610. a second connecting line;

7. a second valve box; 71. a first inlet of the second cage; 72. a second inlet of the second valve box; 73. a third inlet of the second valve box; 74. a first outlet of the second valve box; 75. a second outlet of the second valve cartridge; 76. a first electronic expansion valve of the second valve box; 77. a second electronic expansion valve of the second valve box; 78. a third electronic expansion valve of the second valve box;

81. a second three-way pipe; 82. a third three-way pipe; 83. a fourth three-way pipe; 84. a fifth three-way pipe; 85. and a sixth three-way pipe.

Detailed Description

Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. It should be understood by those skilled in the art that these embodiments are only for explaining the technical principle of the present invention, and are not intended to limit the scope of the present invention. For example, although the drawings are described with respect to an indoor unit having five functional segments, this arrangement is not invariably and can be modified as required by those skilled in the art to suit particular applications. For example, one skilled in the art may add or delete one or more functional segments based on the configuration of the present invention.

It should be noted that in the description of the present invention, the terms of direction or positional relationship indicated by the terms "upper", "lower", "left", "right", etc. are based on the directions or positional relationships shown in the drawings, which are merely for 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 thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," "third," "fourth," "fifth," and "sixth" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

Furthermore, it should be noted that, in the description of the present invention, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood by those skilled in the art according to specific situations.

Based on the problem among the prior art mentioned in the background art, the utility model provides an air conditioning system, this air conditioning system with the exhaust port end of compressor respectively with the entrance point of heating heat exchanger and the first end intercommunication of outdoor heat exchanger, the exit end of heating heat exchanger and the second end of outdoor heat exchanger all communicate with the entrance point of cooling dehumidification heat exchanger, the exit end of cooling dehumidification heat exchanger and the return air port end intercommunication of compressor, make the high temperature high pressure refrigerant that flows from the compressor divide into two the tunnel, the refrigerant becomes normal atmospheric temperature and pressure refrigerant in flowing into heating heat exchanger through first cross valve all the way, another way refrigerant becomes normal atmospheric temperature and pressure refrigerant in flowing into outdoor heat exchanger through the second cross valve, become low temperature low pressure refrigerant and flow into cooling dehumidification heat exchanger after the normal atmospheric temperature and pressure refrigerant that flows from heating heat exchanger steps down through first throttling element throttle, become low temperature low pressure cold after the normal atmospheric temperature and pressure refrigerant that flows from outdoor heat exchanger steps down through the second In the refrigerant flows into the cooling and dehumidifying heat exchanger, in the process, air flowing into the box body from the air inlet of the box body exchanges heat with a low-temperature and low-pressure refrigerant flowing into the cooling and dehumidifying heat exchanger, so that vapor in the air is liquefied into liquid water and discharged; the dehumidified air exchanges heat with the high-temperature and high-pressure refrigerant flowing into the heating heat exchanger, so that the temperature of the dehumidified air is raised to a preset temperature, the purpose of heating after dehumidification is realized, namely, the purposes of dehumidifying the air and improving the temperature of the dehumidified air can be realized by adopting an outdoor unit, the product structure is simplified, the cost is reduced, and the energy waste is avoided.

Referring first to fig. 1, the air conditioning system of the present invention will be described. Wherein, fig. 1 is a structural diagram of the air conditioning system of the present invention.

As shown in fig. 1, the indoor unit 1 and the outdoor unit 2 of the air conditioning system of the present invention, the indoor unit 1 includes a box 11, the box 11 is provided with an air inlet 111 and an air outlet 112, a cooling and dehumidifying section and a heating section are arranged in the box 11 along the air flowing direction, the cooling and dehumidifying section is provided with a cooling and dehumidifying heat exchanger 12, and the heating section is provided with a heating heat exchanger 13; the outdoor unit 2 comprises a casing 21, and a compressor 22, an outdoor heat exchanger 23, a first four-way valve 24 and a second four-way valve 25 which are arranged in the casing 21, wherein a first interface (i.e. a D1 interface), a second interface (i.e. an E1 interface) and a third interface (i.e. an S1 interface) of the first four-way valve 24 are respectively communicated with a discharge port end (i.e. one end on the left side of the paper surface in fig. 1) of the compressor 22, an inlet end (i.e. one end on the left side above the paper surface in fig. 1) of the heating heat exchanger 13 and a return port end (i.e. one end on the; the first port (i.e., the D2 port), the third port (i.e., the S2 port) and the fourth port (i.e., the C2 port) of the second four-way valve 25 are respectively communicated with the exhaust port end of the compressor 22, the air return port end of the compressor 22 and the first end (i.e., the end on the left side of the paper surface in fig. 1) of the outdoor heat exchanger 23; an outlet end (i.e., one end on the right side above the paper surface in fig. 1) of the heating heat exchanger 13 and a second end (i.e., one end on the right side above the paper surface in fig. 1) of the outdoor heat exchanger 23 are both communicated with an inlet end (i.e., one end on the right side above the paper surface in fig. 1) of the cooling and dehumidifying heat exchanger 12, a first throttling element 3 is arranged between the outlet end of the heating heat exchanger 13 and the inlet end of the cooling and dehumidifying heat exchanger 12, and a second throttling element 4 is arranged between the second end of the outdoor heat exchanger 23 and the inlet end of; the outlet end of the temperature-reducing dehumidifying heat exchanger 12 (i.e., the end on the left side above the paper surface in fig. 1) is communicated with the air return port end of the compressor 22. Of course, the interfaces of the first four-way valve 24 respectively communicating with the exhaust port end of the compressor 22, the air return port end of the compressor 22 and the inlet end of the heating heat exchanger 13, and the interfaces of the second four-way valve 25 respectively communicating with the exhaust port end of the compressor 22, the air return port end of the compressor 22 and the first end of the outdoor heat exchanger 23 are not limited to the above-mentioned interfaces, and the first interface, the fourth interface (i.e., the C1 interface) and the third interface of the first four-way valve 24 respectively communicating with the exhaust port end of the compressor 22, the inlet end of the heating heat exchanger 13 and the air return port end of the compressor 22 may be also respectively communicating; alternatively, the first interface, the third interface and the second interface (i.e., the E2 interface) of the second four-way valve 25 are respectively communicated with the exhaust port end of the compressor 22, the air return port end of the compressor 22 and the first end of the outdoor heat exchanger 23, and the connection interfaces of the first four-way valve 24 and the second four-way valve 25 are adjusted in any way, so long as three interfaces of the first four-way valve 24 are respectively communicated with the exhaust port end of the compressor 22, the air return port end of the compressor 22 and the inlet end of the heating heat exchanger 13, and three interfaces of the second four-way valve 25 are respectively communicated with the exhaust port end of the compressor 22, the air return port end of the compressor 22 and the first end of the outdoor heat exchanger 23.

Further, the outlet end of the heating heat exchanger 13 is also communicated with the second end of the outdoor heat exchanger 23, and a third throttling element 5 is arranged between the outlet end of the heating heat exchanger 13 and the second end of the outdoor heat exchanger 23, so that the air conditioning system can control the flow direction of the refrigerant in the air conditioning system according to different dehumidification and heating requirements, for example, the high-temperature and high-pressure refrigerant flowing out of the compressor 22 is divided into two paths to flow to the outdoor heat exchanger 23 and the heating heat exchanger 13 respectively, or flows to the heating heat exchanger 13 completely, and a person skilled in the art can flexibly adjust and set the refrigerant according to actual use requirements.

Preferably, the number of the outdoor heat exchangers 23 is two, and the number of the second four-way valves 25 is two, wherein the two outdoor heat exchangers 23 are arranged in parallel, and three interfaces of each second four-way valve 25 are respectively communicated with the exhaust port end of the compressor 22, the air return port end of the compressor 22 and the first end of one outdoor heat exchanger 23. Of course, the number of the outdoor heat exchangers 23 and the second four-way valve 25 is not limited to the two listed above, and may be one, three, four or more, and the number of the outdoor heat exchangers 23 and the second four-way valve 25 is adjusted in any way, as long as the plurality of outdoor heat exchangers 23 are arranged in parallel, and three interfaces of each second four-way valve 25 are respectively communicated with the exhaust port end of the compressor 22, the air return port end of the compressor 22 and the first end of one outdoor heat exchanger 23.

With continued reference to fig. 1, the outdoor unit 2 further includes a first tee pipe 26, a first end (i.e., end a 1) of the first tee pipe 26 is communicated with a discharge port end of the compressor 22, a second end (i.e., end a 2) of the first tee pipe 26 is communicated with a first port of the first four-way valve 24, and a third end (i.e., end A3) of the first tee pipe 26 is communicated with a first port of the second four-way valve 25.

Alternatively, in an alternative embodiment, the air conditioning system further includes a first refrigerant pipe and a second refrigerant pipe which are independently disposed from each other, a first port of the exhaust port end of the compressor 22 is communicated with the first port of the first four-way valve 24 through the first refrigerant pipe, and a second port of the exhaust port end of the compressor 22 is communicated with the first port of the second four-way valve 25 through the second refrigerant pipe.

In any connection manner, the exhaust port of the compressor 22 may be communicated with the first port of the first four-way valve 24 and the first port of the second four-way valve 25, respectively.

The valve cartridge of the present invention will be described with reference to fig. 1 and 2. In fig. 2, the first valve box is taken as an example to illustrate the structure of the valve box.

As shown in fig. 1, the air conditioning system further includes a first valve box 6 and a second valve box 7, wherein three inlets of the first valve box 6 and the second valve box 7, namely, a first inlet, a second inlet and a third inlet, are respectively communicated with the second interface of the first four-way valve 24, the air return port end of the compressor 22 and the second end of the outdoor heat exchanger 23; the first outlet 614 and the second outlet 615 of the first valve box 6 are respectively communicated with the inlet end and the outlet end of the heating heat exchanger 13, and the first throttling element 3 is arranged between the second outlet 615 of the first valve box 6 and the outlet end of the heating heat exchanger 13; the first outlet 74 and the second outlet 75 of the second valve box 7 are respectively communicated with the inlet end and the outlet end of the temperature-reducing dehumidifying heat exchanger 12, and the second throttling element 4 is arranged between the first outlet of the second valve box 7 and the inlet end of the temperature-reducing dehumidifying heat exchanger 12.

Referring to fig. 2 and with reference to fig. 1, the first valve box 6 of the present invention includes a box body 61, and a first electronic expansion valve 62, a second electronic expansion valve 63, a third electronic expansion valve 64 and a heat exchanger 65 which are disposed in the box body 61, wherein a first inlet 611 of the box body 61 is communicated with a first outlet 614 of the box body 61 through a first pipeline 66, and the first electronic expansion valve 62 is disposed on the first pipeline 66; the second inlet 612 of the box body 61 is communicated with the first outlet 614 of the box body 61 through a second pipeline 67, and the second electronic expansion valve 63 is arranged on the second pipeline 67; the third inlet 613 of the box body 61 is communicated with the second outlet 615 of the box body 61 through a third pipeline 68, the heat exchanger 65 is matched with the third pipeline 68, and a first end (i.e., an end above the paper in fig. 2) of the heat exchanger 65 is communicated with a second inlet 612 of the box body 61 through a first connection pipe 69, a second end (i.e., an end below the paper in fig. 2) of the heat exchanger 65 is communicated with a third pipe 68 through a second connection pipe 610, a third electronic expansion valve 64 is provided on the second connection pipe 610, so that a part of the normal temperature and pressure refrigerant flowing through the third pipeline 68 is throttled and depressurized by the third electronic expansion valve 64 to become a low temperature and low pressure refrigerant, and flows into the heat exchanger 65, and other refrigerants subsequently flowing through the third pipeline 68 are subcooled to reduce the temperature of the refrigerant, the part of the refrigerant used for supercooling flows out of the heat exchanger 65 and is directly returned to the compressor 22. Of course, it will be understood by those skilled in the art that the first valve box 6 may only include the first electronic expansion valve 62 and the second electronic expansion valve 63 disposed in the box 61, and the heat exchanger 65 and the third electronic expansion valve 64 cooperating with the third pipeline 68 need not be disposed in the box 61, and the refrigerant flowing through the third pipeline 68 need not be subcooled by the heat exchanger 65 and the third electronic expansion valve 64.

As shown in fig. 2, the heat exchanger 65 includes a heat exchange housing 651 and a heat exchange line 652, the heat exchange housing 651 forms a heat exchange chamber therein, the heat exchange line 652 is disposed in the heat exchange chamber, and an outlet end of the heat exchange housing 651 (i.e., a first end of the heat exchanger 65) communicates with an inlet end of the heat exchange housing (i.e., a second end of the heat exchanger 65) through the heat exchange line 652; a first end (i.e., the end below the paper surface in fig. 2) of the third pipe 68 is communicated with the second outlet of the box body 61, and a second end (i.e., the end above the paper surface in fig. 1) of the third pipe 68 is communicated with the third inlet 613 of the box body 61 through the heat exchange chamber; a first end (i.e., an end below the paper surface in fig. 2) of the second connecting duct 610 communicates with the inlet end of the heat exchange housing 651, a second end (i.e., an end above the paper surface in fig. 1) of the second connecting duct 610 communicates with the third duct 68, and a portion where the third duct 68 is connected with the second end of the second connecting duct 610 is disposed near the third inlet 613 of the box body 61. Of course, the outlet end of the heat exchange housing 651 may be disposed at the lower portion of the heat exchange housing 651 (i.e., at the end below the paper surface in fig. 2), the inlet end of the heat exchange housing 651 may be disposed at the upper portion of the heat exchange housing 651 (i.e., at the end above the paper surface in fig. 2), the first end of the second connecting line 610 may be communicated with the inlet end of the heat exchange housing 651, the second end of the second connecting line 610 may be communicated with the third line 68, and a portion where the third line 68 is connected to the second end of the second connecting line 610 may be disposed near the second outlet 615 of the box body 61, and the outlet end, the inlet end, and the connecting position of the second connecting line 610 and the third line 68 of the heat exchange housing 651 may be adjusted so that the heat exchanger 65 and the third electronic expansion valve 64 can supercool the refrigerant flowing through.

Preferably, the heat exchange pipeline 652 may have a serpentine structure, a spiral structure, or a zigzag structure, so as to prolong the retention time of the refrigerant throttled and depressurized by the third electronic expansion valve in the heat exchanger 65, thereby improving the heat exchange efficiency.

The heat exchanger 65 may include only the heat exchange housing 651, and the refrigerant throttled and depressurized by the third electronic expansion valve may be directly input into the heat exchange housing 651 without providing the heat exchange line 652 in the heat exchange housing 651.

It should be further noted that the structure of the second valve box 7 is the same as that of the first valve box 6, and specific structures may refer to corresponding descriptions in the first valve box 6, and are not described herein again.

Referring again to fig. 1, the air conditioning system further includes a second three-way pipe 81, a third three-way pipe 82, a fourth three-way pipe 83, a fifth three-way pipe 84, and a sixth three-way pipe 85, a first end (i.e., end B1) of the second three-way pipe 81 is communicated with the third port of the second four-way valve 25, a second end (i.e., end B2) of the second three-way pipe 81 is communicated with the third port of the first four-way valve 24, and a third end (i.e., end B3) of the second three-way pipe 81 is communicated with the first end (i.e., end F1) of the third three-way pipe 82; a second end (i.e., end F2) of the third tee 82 communicates with the air return port end of the compressor 22, and a third end (i.e., end F3) of the third tee 82 communicates with a first end (i.e., end G1) of the fourth tee 83; a second end (i.e., end G2) of fourth tee 83 communicates with second inlet 612 of first cage 6, and a third end (i.e., end G3) of fourth tee 83 communicates with second inlet 72 of second cage 7; a first end (i.e., end H1) of fifth tee 84 communicates with the second port of first four-way valve 24, and a second end (i.e., end H2) of fifth tee 84 communicates with first inlet 611 of first cage 6; the third end (i.e., end H3) of fifth tee 84 communicates with first inlet 71 of second valve box 7; a first end (i.e., end I1) of the sixth tee 85 communicates with the second end of the outdoor heat exchanger 23, and a third throttling element 5 is disposed between the first end of the sixth tee 85 and the second end of the outdoor heat exchanger 23; a second end (i.e., end I2) of the sixth tee 85 communicates with the third inlet 613 of the first cage 6; the third end of the sixth tee 85 (i.e., end I3) communicates with the third inlet 73 of the second valve box 7.

Alternatively, in an alternative embodiment, the outdoor unit 2 may only include the second tee 81, the fourth tee 83, the fifth tee 84 and the sixth tee 85, wherein the first end and the second end of the second tee 81 and the second end of the fourth tee 83 are connected to the third end, the fifth tee 84 and the sixth tee 85 as described above with reference to the specific description of the above embodiment, except that the third end of the second tee 81 is communicated with the first port of the air return port end of the compressor 22 and the first end of the fourth tee 83 is communicated with the second port of the air return port end of the compressor 22.

Or, in yet another alternative embodiment, the air conditioning system includes a third refrigerant pipe, a fourth refrigerant pipe, a fifth refrigerant pipe, a sixth refrigerant pipe, and the second three-way pipe 81 and the fifth three-way pipe 84 that are independent of each other, the first port of the air return port end of the compressor 22 is communicated with the second inlet 612 of the first valve box 6 through the third refrigerant pipe, the second port of the air return port end of the compressor 22 is communicated with the second inlet 72 of the second valve box 7 through the fourth refrigerant pipe, the first port of the second end of the outdoor heat exchanger 23 is communicated with the third inlet 613 of the first valve box 6 through the fifth refrigerant pipe, and the second port of the second end of the outdoor heat exchanger 23 is communicated with the third inlet 73 of the second valve box 7 through the sixth refrigerant pipe; the specific connection manner of the first end and the second end of the second tee 81 and the fifth tee 84 refers to the specific description in the above embodiment, and the difference is only that the third end of the second tee 81 is directly communicated with the third interface of the air return port end of the compressor 22.

In any connection manner, the air return port of the compressor 22 is respectively communicated with the third interface of the first four-way valve 24, the third interface of the second four-way valve 25, the second inlet 612 of the first valve box 6 and the second inlet 72 of the second valve box 7, the second end of the outdoor heat exchanger 23 is respectively communicated with the third inlet 613 of the first valve box 6 and the third inlet 73 of the second valve box 7, the second interface of the first four-way valve 24 is respectively communicated with the first inlet 611 of the first valve box 6 and the first inlet 71 of the second valve box 7, and the flow direction of the refrigerant can be controlled by the first valve box 6 and the second valve box 7.

Preferably, the first throttling element 3, the second throttling element 4 and the third throttling element 5 may be a thermal expansion valve, an electronic expansion valve, a capillary tube, a throttling solenoid valve or the like.

As shown in fig. 1, the outdoor unit 2 further includes a gas-liquid separator 27, an outlet end of the gas-liquid separator 27 is communicated with a gas return port end of the compressor 22, an inlet end of the gas-liquid separator 27 is communicated with a second end of a third tee pipe 82, a first end of the third tee pipe 82 is communicated with a third end of a second tee pipe 81, and a third end of the third tee pipe 82 is communicated with a first end of a fourth tee pipe 83.

Five operation modes of the air conditioning system of the present invention will be described with reference to fig. 3 to 7. In the following five operation modes, two outdoor heat exchangers are operated as an example.

The first operation mode is mainly used for a large-load dehumidification and small-load heating scene.

Referring to fig. 3, fig. 3 is an operation diagram of a first operation mode of the air conditioning system of the present invention. In fig. 3, arrows indicate the flow direction of the refrigerant.

As shown in fig. 3, when the air conditioning system is in the first operation mode, the first interface and the second interface of the first four-way valve 24 are conducted, the third interface and the fourth interface of the first four-way valve 24 are conducted, the fourth interface of the first four-way valve 24 is closed, the first interface and the fourth interface of the second four-way valve 25 are conducted, the second interface and the third interface of the second four-way valve 25 are conducted, the second interface of the second four-way valve 25 is closed, the first electronic expansion valve 62 in the first valve box 6 is in the fully opened state, the second electronic expansion valve 63 in the first valve box 6 is in the closed state, the third electronic expansion valve 64 in the first valve box 6 is opened by a predetermined angle, the first electronic expansion valve 76 in the second valve box 7 is in the closed state, the second electronic expansion valve 77 in the second valve box 7 is in the fully opened state, the third electronic expansion valve 78 in the second valve box 7 is opened by a predetermined angle, the second throttling element 4 is opened by a preset angle and the first throttling element 3 and the third throttling element 5 are in a fully open state.

At this time, the high-temperature and high-pressure refrigerant flowing out of the compressor 22 is divided into two paths, one path of refrigerant flows into the heating heat exchanger 13 through the first four-way valve 24 and the first valve box 6 to become normal-temperature and normal-pressure refrigerant, the other path of refrigerant flows into the outdoor heat exchanger 23 through the second four-way valve 25 to become normal-temperature and normal-pressure refrigerant, the flow rate of the refrigerant flowing into the heating heat exchanger 13 is reduced, and the demand of heating with small load is met; after the normal temperature and pressure refrigerant flowing out of the heating heat exchanger 13 is sequentially subcooled and reduced in temperature by the first valve box 6, the normal temperature and pressure refrigerant and the normal temperature and pressure refrigerant flowing out of the outdoor heat exchanger 23 are converged at the sixth three-way pipe 85 and are subcooled and reduced in temperature by the second valve box 7, the subcooled and reduced-temperature refrigerant is throttled and reduced in pressure by the second throttling element 4 to become a low-temperature and low-pressure refrigerant and flows into the cooling and dehumidifying heat exchanger 12, the refrigerant flows into the cooling and dehumidifying heat exchanger 12 to become the normal temperature and low-pressure refrigerant and flows out and returns to the compressor 22, and a part of the refrigerant with very small supercooling directly returns to the compressor 22, namely, most of the refrigerant flows into the cooling and dehumidifying heat exchanger 12 to meet the. In the process, the air flowing into the box body 11 from the air inlet 111 of the box body 11 exchanges heat with the low-temperature and low-pressure refrigerant flowing into the temperature-reducing and dehumidifying heat exchanger 12, so that the water vapor in the air is liquefied into liquid water and is discharged; the dehumidified air exchanges heat with the high-temperature and high-pressure refrigerant flowing into the heating heat exchanger 13, so that the temperature of the dehumidified air is raised to a preset temperature, and the flow of the refrigerant flowing into the heating heat exchanger 13 is reduced, so that the purpose of heating under a heavy load after dehumidification under a light load is achieved.

In the first operation mode, the first throttling element 3 and the third throttling element 5 may be opened by a predetermined angle, the second throttling element 4 may be fully opened, the third electronic expansion valve 64 in the first valve housing 6 may be closed, and the third electronic expansion valve 78 in the second valve housing 7 may be closed, so that the opening combination of the first throttling element 3, the second throttling element 4, the third throttling element 5, the third electronic expansion valve 64 in the first valve housing 6, and the third electronic expansion valve 78 in the second valve housing 7 may be adjusted, so long as the normal-temperature and normal-pressure refrigerant flowing out of the outdoor heat exchanger 23 and the normal-temperature and normal-pressure refrigerant flowing out of the heating heat exchanger 13 can be throttled.

And the second operation mode is mainly used for a scene of dehumidification under a small load and heating under a large load.

Referring to fig. 4, fig. 4 is an operation diagram of a second operation mode of the air conditioning system of the present invention. In fig. 4, arrows indicate the flow direction of the refrigerant.

As shown in fig. 4, when the air conditioning system is in the second operation mode, the first port and the second port of the first four-way valve 24 are communicated, the third port and the fourth port of the first four-way valve 24 are communicated, the fourth port of the first four-way valve 24 is closed, the first port and the second port of the second four-way valve 25 are communicated, the third port and the fourth port of the second four-way valve 25 are communicated, the second port of the second four-way valve 25 is closed, the first electronic expansion valve 62 in the first valve box 6 is in the fully opened state, the second electronic expansion valve 63 in the first valve box 6 is in the closed state, the third electronic expansion valve 64 in the first valve box 6 is opened by a predetermined angle, the first electronic expansion valve 76 in the second valve box 7 is closed, the second electronic expansion valve 77 in the second valve box 7 is in the fully opened state, the third electronic expansion valve 78 in the second valve box 7 is opened by a predetermined angle, the second and third throttling elements 4 and 5 are opened by a preset angle and the first throttling element 3 is in a fully open state.

At this time, all the high-temperature and high-pressure refrigerant flowing out of the compressor 22 flows into the heating heat exchanger 13 through the first four-way valve 24 to be changed into normal-temperature and normal-pressure refrigerant, so as to meet the requirement of large-load heating; the normal temperature and normal pressure refrigerant flowing out of the heating heat exchanger 13 is supercooled by the first valve box 6 to reduce the temperature, the supercooled refrigerant is divided into two paths, one path of refrigerant is throttled and decompressed by the third throttling element 5 to become low temperature and low pressure refrigerant and flows into the outdoor heat exchanger 23, and the refrigerant flowing into the outdoor heat exchanger 23 becomes low temperature and low pressure refrigerant and flows out and returns to the compressor 22; the other path of refrigerant is firstly subcooled by the second valve box 7 to reduce the temperature again, is throttled and reduced in pressure by the second throttling element 4 to become a low-temperature low-pressure refrigerant and flows into the temperature-reducing dehumidifying heat exchanger 12, the refrigerant flowing into the temperature-reducing dehumidifying heat exchanger 12 becomes a normal-temperature low-pressure refrigerant and flows out and returns to the compressor 22, and a part of refrigerant which is used for subcooling and is very small directly returns to the compressor 22, so that the flow of the refrigerant flowing into the temperature-reducing dehumidifying heat exchanger 12 is reduced, and the requirement of low-load dehumidification is met. In the process, the air flowing into the box body 11 from the air inlet 111 of the box body 11 exchanges heat with the low-temperature and low-pressure refrigerant flowing into the temperature-reducing and dehumidifying heat exchanger 12, so that the water vapor in the air is liquefied into liquid water and is discharged; the dehumidified air exchanges heat with the high-temperature and high-pressure refrigerant flowing into the heating heat exchanger 13, so that the temperature of the dehumidified air is raised to a preset temperature, and the flow of the refrigerant flowing into the cooling and dehumidifying heat exchanger 12 is reduced, so that the purpose of heating under a large load after dehumidification under a small load is achieved.

In the second operation mode, the first throttling element 3 may be opened by a predetermined angle, the second throttling element 4 and the third throttling element 5 may be fully opened, the third electronic expansion valve 64 in the first valve box 6 may be closed, and the third electronic expansion valve 78 in the second valve box 7 may be closed, so that the opening combination of the first throttling element 3, the second throttling element 4, the third throttling element 5, the third electronic expansion valve 64 in the first valve box 6, and the third electronic expansion valve 78 in the second valve box 7 may be adjusted, so long as the normal-temperature and normal-pressure refrigerant flowing out of the heating heat exchanger 13 can be throttled.

A third mode of operation, primarily for substantially the same load dehumidification and heating scenarios.

Referring to fig. 5, fig. 5 is an operation diagram of a third operation mode of the air conditioning system of the present invention. In fig. 5, arrows indicate the flow direction of the refrigerant.

As shown in fig. 5, when the air conditioning system is in the third operation mode, the first and second ports of the first four-way valve 24 are communicated, the third and fourth ports of the first four-way valve 24 are communicated, the fourth port of the first four-way valve 24 is closed, the first and second ports of the second four-way valve 25 are communicated, the third and fourth ports of the second four-way valve 25 are communicated, the second port of the second four-way valve 25 is closed, the first electronic expansion valve 62 in the first valve box 6 is in the fully open state, the second electronic expansion valve 63 in the first valve box 6 is in the closed state, the third electronic expansion valve 64 in the first valve box 6 is opened by a predetermined angle, the first electronic expansion valve 76 in the second valve box 7 is closed, the second electronic expansion valve 77 in the second valve box 7 is in the fully open state, the third electronic expansion valve 78 in the second valve box 7 is opened by a predetermined angle, the second throttling element 4 is opened by a preset angle, the first throttling element 3 is in a full open state, and the third throttling element 5 is in a closed state.

At this time, all the high-temperature and high-pressure refrigerant flowing out of the compressor 22 flows into the heating heat exchanger 13 through the first four-way valve 24 to become normal-temperature and normal-pressure refrigerant, the normal-temperature and normal-pressure refrigerant flowing out of the heating heat exchanger 13 is sequentially subcooled and reduced in temperature through the first valve box 6 and the second valve box 7, the refrigerant after being subcooled and reduced in temperature is throttled and reduced in pressure through the second throttling element 4 to become low-temperature and low-pressure refrigerant and flows into the temperature-reducing and dehumidifying heat exchanger 12, the refrigerant flowing into the temperature-reducing and dehumidifying heat exchanger 12 becomes normal-temperature and low-pressure refrigerant and flows out and returns to the compressor 22, and a part of the refrigerant which is used for subcooling is very small is directly returned to the compressor 22, so that the flow rate of. In the process, the air flowing into the box body 11 from the air inlet 111 of the box body 11 exchanges heat with the low-temperature and low-pressure refrigerant flowing into the temperature-reducing and dehumidifying heat exchanger 12, so that the water vapor in the air is liquefied into liquid water and is discharged; the dehumidified air exchanges heat with the high-temperature and high-pressure refrigerant flowing into the heating heat exchanger 13, so that the temperature of the dehumidified air is raised to a preset temperature, and the flow rate of the refrigerant flowing into the heating heat exchanger 13 is basically the same as that of the refrigerant flowing into the cooling and dehumidifying heat exchanger 12, so that the purposes of dehumidification and heating with basically the same load are achieved.

In the third operation mode, the first throttling element 3 may be opened by a predetermined angle, the second throttling element 4 may be fully opened, the third throttling element 5 may be closed, the third electronic expansion valve 64 in the first valve box 6 may be closed, and the third electronic expansion valve 78 in the second valve box 7 may be closed, so that the opening combination of the first throttling element 3, the second throttling element 4, the third throttling element 5, the third electronic expansion valve 64 in the first valve box 6, and the third electronic expansion valve 78 in the second valve box 7 may be adjusted, so long as the normal-temperature and normal-pressure refrigerant flowing out of the heating heat exchanger 13 can be throttled.

And a fourth operation mode, wherein the fourth operation mode is mainly used for a refrigerating scene.

Referring to fig. 6, fig. 6 is an operation diagram of a fourth operation mode of the air conditioning system of the present invention. In fig. 6, arrows indicate the flow direction of the refrigerant.

As shown in fig. 6, when the air conditioning system is in the fourth operation mode, the first interface and the fourth interface of the first four-way valve 24 are conducted, the second interface and the third interface of the first four-way valve 24 are conducted, the fourth interface of the first four-way valve 24 is closed, the first interface and the fourth interface of the second four-way valve 25 are conducted, the third interface and the fourth interface of the second four-way valve 25 are conducted, the second interface of the second four-way valve 25 is closed, the first electronic expansion valve 76 and the second electronic expansion valve 77 in the second valve box 7 are in the fully opened state, the third electronic expansion valve 78 in the second valve box 7 is opened by a predetermined angle, the second throttling element 4 is opened by a predetermined angle, the third throttling element 5 is in the fully opened state, the first throttling element 3, the first electronic expansion valve 62, the second electronic expansion valve 63, and the third electronic expansion valve 64 in the first valve box 6 are all in a closed state.

At this time, all the high-temperature and high-pressure refrigerant flowing out of the compressor 22 flows into the outdoor heat exchanger 23 through the second four-way valve 25 to become normal-temperature and normal-pressure refrigerant, the normal-temperature and normal-pressure refrigerant flowing out of the outdoor heat exchanger 23 is supercooled by the second valve box 7 to reduce the temperature, the refrigerant with the supercooled reduced temperature is throttled and reduced by the second throttling element 4 to become low-temperature and low-pressure refrigerant, the refrigerant flowing into the cooling and dehumidifying heat exchanger 12 becomes normal-temperature and low-pressure refrigerant, the normal-temperature and low-pressure refrigerant flowing out of the cooling and dehumidifying heat exchanger 12 is divided into two paths by the second valve box 7, one path of refrigerant directly returns to the compressor 22, the other path of refrigerant returns to the compressor 22 through the first four-way valve 24, and a very small. In the process, the air flowing into the box body 11 from the air inlet 111 of the box body 11 exchanges heat with the low-temperature low-pressure refrigerant flowing into the temperature-reducing dehumidifying heat exchanger 12, so that the water vapor in the air is liquefied and changed into liquid water to be discharged, and the refrigerant does not flow into the heating heat exchanger 13 and is not heated to raise the temperature, so that the purposes of only refrigerating, namely cooling and dehumidifying are achieved.

In the fourth operation mode, the third throttling element 5 may be opened by a predetermined angle, the second throttling element 4 may be fully opened, the first throttling element 3 may be closed, and the third electronic expansion valve 78 in the second valve box 7 may be closed, so that the opening combination of the first throttling element 3, the second throttling element 4, the third throttling element 5, and the third electronic expansion valve 78 in the second valve box 7 may be adjusted, so long as the normal-temperature and normal-pressure refrigerant flowing out of the outdoor heat exchanger 23 can be throttled.

A fifth mode of operation, the fifth mode of operation being primarily for a heated scene.

Referring to fig. 7, fig. 7 is an operation diagram of a fifth operation mode of the air conditioning system of the present invention. In fig. 7, arrows indicate the flow direction of the refrigerant.

As shown in fig. 7, when the air conditioning system is in the fifth operation mode, the first port and the second port of the first four-way valve 24 are conducted, the third port and the fourth port of the first four-way valve 24 are conducted, the fourth port of the first four-way valve 24 is closed, the first port and the second port of the second four-way valve 25 are conducted, the third port and the fourth port of the second four-way valve 25 are conducted, the second port of the second four-way valve 25 is closed, the first electronic expansion valve 62 in the first valve box 6 is in the fully opened state, the second electronic expansion valve 63 in the first valve box 6 is in the closed state, the third electronic expansion valve 64 in the first valve box 6 is opened by a predetermined angle, the third throttling element 5 is opened by a predetermined angle, the first throttling element 3 is in the fully opened state, the second throttling element 4, the first electronic expansion valve 76 in the second valve box 7, both the second electronic expansion valve 77 and the third electronic expansion valve 78 are in a closed state.

At this time, all the high-temperature and high-pressure refrigerant flowing out of the compressor 22 flows into the heating heat exchanger 13 through the first four-way valve 24 to become normal-temperature and normal-pressure refrigerant, the normal-temperature and normal-pressure refrigerant flowing out of the heating heat exchanger 13 is supercooled by the first valve box 6 to reduce the temperature, the refrigerant with the supercooled and reduced temperature is throttled and reduced by the third throttling element 5 to become low-temperature and low-pressure refrigerant and flows into the outdoor heat exchanger 23, the refrigerant flowing into the outdoor heat exchanger 23 becomes normal-temperature and low-pressure refrigerant and flows out and returns to the compressor 22, and a very small part of the refrigerant used for supercooling directly returns to the compressor. In the process, the air flowing into the box body 11 from the air inlet 111 of the box body 11 exchanges heat with the high-temperature high-pressure gas flowing into the heating heat exchanger 13, so that the temperature of the air is raised to a preset temperature, and no refrigerant flows into the cooling and dehumidifying heat exchanger 12, so that the purpose of heating only is realized.

In the fifth operation mode, the first throttling element 3 may be opened by a predetermined angle, the third throttling element 5 may be fully opened, the second throttling element 4 may be closed, and the third electronic expansion valve 64 in the first valve box 6 may be closed, so that the opening combination of the first throttling element 3, the second throttling element 4, the third throttling element 5, and the third electronic expansion valve 64 in the first valve box 6 may be adjusted, so long as the high-temperature and high-pressure refrigerant flowing out of the heating heat exchanger 13 can be throttled.

It should be further noted that, in the above five operation modes, the preset angle and the preset temperature may be set by those skilled in the art according to actual use requirements, or may be set by those skilled in the art according to experiments, and the present invention does not limit this.

Next, with continued reference to fig. 1, the indoor unit 1 of the present invention will be described.

As shown in fig. 1, in addition to the cooling dehumidifying section and the heating section, a mixing section, an air supply section and a filtering section are further disposed in the box 11, and five functional sections are illustrated as J-N, wherein an air inlet 111 and an air outlet 112 are respectively disposed at two ends of the box 11, the air inlet 111 is disposed in the mixing section J, the air inlet 111 is communicated with the outdoor environment, the air outlet 112 is disposed in the air supply section N, and the air outlet 112 is communicated with the indoor environment; the mixing section J, the filtering section K, the cooling and dehumidifying section L, the heating section M and the air supply section N are sequentially arranged along the air flowing direction. The functional components comprise a filtering component 14, a cooling and dehumidifying heat exchanger 12, a heating heat exchanger 13 and a fan 15, and the functional components are respectively installed on a filtering section K, a cooling and dehumidifying section L, a heating section M and an air supply section N of the box body 11. Of course, the functional segments of the casing 11 are not limited to those listed above, and a new indoor unit 1 may be assembled by deleting some or all of the mixing segment J, the filtering segment K, and the blowing segment N. Of course, the box 11 may further include other functional sections or be provided with other openings, for example, a chuarmy section may be provided between the filtering section K and the air supply section N, or an indoor air return opening may be provided on the mixing section J.

Preferably, the functional component further comprises a heating element 16, such as an electric heater, a steam heating pipe, etc., the heating element 16 is installed in the heating section M and located on the leeward side (i.e. the right side of the paper surface in fig. 1) of the heating heat exchanger 13, and the heating element 16 and the heating heat exchanger 13 are used in cooperation for heating the air flowing through the heating section M, so as to ensure that the air flowing through the heating section M can be heated to a preset temperature.

Preferably, the cooling and dehumidifying section L is further provided with a drain hole 17, the drain hole 17 is located at the bottom of the cooling and dehumidifying section L, and water vapor in the air is liquefied into liquid water and then is discharged through the drain hole.

One possible operation of the indoor unit 1 described above is described below with reference to fig. 1.

The air gets into box 11 by air intake 111, reachs filter segment K after mixing section J, filters the air by filtering component 14, the air after the filtration through with be located cooling dehumidification heat exchanger 12 of cooling dehumidification section L and cool down the dehumidification, the air after the cooling dehumidification heats the intensification with being located the heating heat exchanger 13 of heating section M, the air after the dehumidification heating flows into air supply section N and finally discharges from air outlet 112 under the drive of fan 15.

So far, the technical solution of the present invention has been described with reference to the preferred embodiments shown in the drawings, but it is easily understood by those skilled in the art that the scope of the present invention is obviously not limited to these specific embodiments. Without departing from the principle of the present invention, a person skilled in the art can make equivalent changes or substitutions to the related technical features, and the technical solutions after these changes or substitutions will fall within the protection scope of the present invention.

Claims (10)

1. An air conditioning system, which comprises an indoor unit and an outdoor unit,

the indoor unit comprises a box body, an air inlet and an air outlet are formed in the box body, a cooling and dehumidifying section and a heating section are arranged in the box body along the air flowing direction, a cooling and dehumidifying heat exchanger is arranged in the cooling and dehumidifying section, and a heating heat exchanger is arranged in the heating section;

the outdoor unit comprises a casing, and a compressor, an outdoor heat exchanger, a first four-way valve and a second four-way valve which are arranged in the casing, wherein,

three interfaces of the first four-way valve are respectively communicated with an exhaust port end of the compressor, an air return port end of the compressor and an inlet end of the heating heat exchanger;

three interfaces of the second four-way valve are respectively communicated with the exhaust port end of the compressor, the air return port end of the compressor and the first end of the outdoor heat exchanger;

the outlet end of the heating heat exchanger and the second end of the outdoor heat exchanger are both communicated with the inlet end of the cooling dehumidifying heat exchanger, a first throttling element is arranged between the outlet end of the heating heat exchanger and the inlet end of the cooling dehumidifying heat exchanger, and a second throttling element is arranged between the second end of the outdoor heat exchanger and the inlet end of the cooling dehumidifying heat exchanger;

and the outlet end of the cooling and dehumidifying heat exchanger is communicated with the air return port end of the compressor.

2. The air conditioning system of claim 1, wherein the outlet end of the heating heat exchanger is in communication with the second end of the outdoor heat exchanger, and a third throttling element is disposed between the outlet end of the heating heat exchanger and the second end of the outdoor heat exchanger.

3. The air conditioning system of claim 1, wherein the outdoor unit further comprises a first tee pipe;

the first end of the first three-way pipe is communicated with the exhaust port end of the compressor, the second end of the first three-way pipe is communicated with the first interface of the first four-way valve, and the third end of the first three-way pipe is communicated with the first interface of the second four-way valve.

4. The air conditioning system of any of claims 1-3, further comprising a first valve box and a second valve box, wherein,

three inlets of the first valve box and the second valve box are respectively communicated with a second interface of the first four-way valve, a second end of the outdoor heat exchanger and an air return port of the compressor;

two outlets of the first valve box are respectively communicated with the inlet end and the outlet end of the heating heat exchanger;

and two outlets of the second valve box are respectively communicated with the inlet end and the outlet end of the cooling and dehumidifying heat exchanger.

5. The air conditioning system of claim 4, wherein the first valve box and the second valve box each comprise a box body and a first electronic expansion valve and a second electronic expansion valve disposed within the box body, wherein,

the first inlet of the box body is communicated with the first outlet of the box body through a first pipeline, and the first electronic expansion valve is arranged on the first pipeline;

the second inlet of the box body is communicated with the first outlet through a second pipeline, and the second electronic expansion valve is arranged on the second pipeline;

and the third inlet of the box body is communicated with the second outlet of the box body through a third pipeline.

6. The air conditioning system of claim 5, wherein the first and second valve cartridges further comprise a heat exchanger and a third electronic expansion valve disposed within the cartridge body, wherein,

the heat exchanger with the third pipeline cooperation sets up, just the first end of heat exchanger pass through first connecting line with the second import intercommunication, the second end of heat exchanger pass through the second connecting line with the third pipeline intercommunication, third electronic expansion valve sets up on the second connecting line.

7. The air conditioning system as claimed in claim 1, wherein the number of the outdoor heat exchangers is plural, and the plural outdoor heat exchangers are arranged in parallel.

8. The air conditioning system as claimed in claim 7, wherein the outdoor unit includes a plurality of the second four-way valves, and three ports of each of the second four-way valves are respectively communicated with a discharge port end of the compressor, a return port end of the compressor, and a first end of one of the outdoor heat exchangers.

9. The air conditioning system of claim 1, wherein the box body is further provided with a mixing section and an air supply section respectively, the air inlet is arranged in the mixing section, the air outlet is arranged in the air supply section, and the air supply section is provided with a fan;

the cooling dehumidification section with the heating section sets gradually along the air flow direction mix the section with between the air supply section.

10. The air conditioning system of claim 9, wherein a filter section is further disposed between the mixing section and the temperature and humidity reducing section, and a filter assembly is disposed in the filter section.

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