Indoor unit and air conditioning system

Abstract

The utility model relates to the technical field of air conditioning, and discloses an indoor unit and an air conditioning system. The indoor unit comprises a plurality of heat exchanger sets, the heat exchanger sets are arranged in parallel or in series, at least two of the heat exchanger sets are located in different spaces, each heat exchanger set comprises at least two heat exchangers arranged in series and valve sets, the number of the valve sets is the same as that of the heat exchanger sets, and the valve sets correspond to the heat exchanger sets in a one-to-one mode. The valve set comprises a plurality of valves, and the valves are used for adjusting the state of refrigerants flowing into the heat exchangers in the heat exchanger set. Different temperature adjusting modes and humidity adjusting modes of multiple spaces can be achieved at the same time, and the cost of the air conditioning system is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of air conditioning, for example, to an indoor unit and an air conditioning system. Background Art

[0002] At present, the existing central air-conditioning fluorine system terminals are all two-pipe or three-pipe systems. The two-pipe fluorine system terminal can only realize a few functions such as heating / cooling, surface cooling dehumidification and reverse cycle defrosting, while the three-pipe fluorine system can realize more functions than the two-pipe system, such as: reheat dehumidification, simultaneous cooling and heating, and non-stop defrosting. However, the three-pipe system has one more pipe than the two-pipe system, and the number of valves is also increased compared to the two-pipe system. The requirements for the size of the outdoor unit, which is already tight, have become higher and higher. Therefore, while realizing the diversification of air-conditioning functions, it has become particularly urgent to control the size of the outdoor unit without increasing costs.

[0003] An indoor unit is disclosed in the related technology, and the indoor unit includes: a first valve, a second valve, a third valve, a fourth valve, a three-way reversing valve, a first heat exchanger and a second heat exchanger; the first end of the first valve is used to connect to the first end of the outdoor unit, and the second end of the first valve is connected to the first end of the first heat exchanger; the second end of the first heat exchanger is connected to the first end of the three-way reversing valve, the second end of the three-way reversing valve is connected to the first end of the second valve, the third end of the three-way reversing valve is used to connect to the second end of the outdoor unit, and the second end of the second valve is connected to the first end of the first valve; the first end of the second heat exchanger is connected to the first end of the first valve through the third valve, and the second end of the second heat exchanger is connected to the second end of the three-way reversing valve; the first end of the fourth valve is connected to the first end of the second heat exchanger, and the third end of the fourth valve is connected to the third end of the three-way reversing valve.

[0004] In the process of implementing the embodiments of the present disclosure, it is found that there are at least the following problems in the related art:

[0005] The indoor unit in the related art is a two-pipe structure, which can realize different temperature control and humidity control modes under a single working condition of cooling or heating different spaces at the same time, but cannot provide differentiated temperature control and humidity control modes for different working conditions in different spaces at the same time.

[0006] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present application, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Utility Model Content

[0007] In order to provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. The summary is not an extensive review, nor is it intended to identify key / critical components or delineate the scope of protection of these embodiments, but rather serves as a prelude to the detailed description that follows.

[0008] The embodiments of the present disclosure provide an indoor unit and an air-conditioning system to provide differentiated temperature control and humidity control modes for different spaces and different working conditions at the same time.

[0009] An embodiment of the present disclosure provides an indoor unit, which includes: a heat exchanger group, the number of which is multiple, the multiple heat exchanger groups are arranged in parallel or in series, at least two of the multiple heat exchanger groups are located in different spaces, wherein each heat exchanger group includes at least two heat exchangers arranged in series, and a valve group, the number of which is the same as that of the heat exchanger groups and corresponds one to one, the valve group includes multiple valves, and the multiple valves are used to adjust the refrigerant state of the multiple heat exchangers flowing into the heat exchanger groups.

[0010] Optionally, the multiple heat exchanger groups include a first heat exchanger group and a second heat exchanger group, each heat exchanger group includes a first heat exchanger and a second heat exchanger arranged in series, and the valve group includes: a first valve, a first end of the first valve is suitable for connecting to the first end of the outdoor unit, and the second end of the first valve is connected to the first end of the first heat exchanger; a second valve is connected between the second end of the first valve and the first end of the first heat exchanger; a third valve is connected between the second end of the first heat exchanger and the first end of the second heat exchanger; a fourth valve, a first end of the fourth valve is connected to the second end of the second heat exchanger, and the second end of the fourth valve is suitable for connecting to the second end of the outdoor unit; a fifth valve is connected between the second end of the first valve and the second end of the outdoor unit.

[0011] Optionally, at least one of the second valve and the third valve in at least one heat exchanger group is a throttling device; and / or the first valve and / or the fourth valve is a three-way reversing valve.

[0012] Optionally, the first valve of the first heat exchanger group and the fourth valve of the second heat exchanger group are both three-way reversing valves, and the third end of the first valve of the first heat exchanger group is connected to the third end of the fourth valve of the second heat exchanger group.

[0013] Optionally, the fourth valve of the first heat exchanger group, the first valve of the second heat exchanger group, and the fourth valve of the second heat exchanger group are all three-way reversing valves, and the third end of the fourth valve of the first heat exchanger group is connected to the third end of the fourth valve of the second heat exchanger group, wherein the third end of the first valve of the second heat exchanger group is connected to the third end of the fourth valve of the first heat exchanger group and the fourth valve of the second heat exchanger group.

[0014] Optionally, the first valve and the fourth valve of the first heat exchanger group are both three-way reversing valves, and the third end of the first valve of the first heat exchanger group is connected to the third end of the fourth valve of the first heat exchanger group; and / or, the first valve and the fourth valve of the second heat exchanger group are both three-way reversing valves, and the third end of the first valve of the second heat exchanger group is connected to the third end of the fourth valve of the second heat exchanger group.

[0015] Optionally, the first valve and the fourth valve are both three-way reversing valves, and the indoor unit also includes: a first balancing pipe, the first balancing pipe is connected between the third end of the first valve of the first heat exchanger group and the third end of the fourth valve of the second heat exchanger group, and the third end of the fourth valve of the first heat exchanger group and the third end of the first valve of the second heat exchanger group are both connected to the first balancing pipe.

[0016] Optionally, the multiple heat exchanger groups also include a third heat exchanger group, the balance pipe also includes a second balance pipe, the first end of the second balance pipe is connected to the third end of the fourth valve of the second heat exchanger group, the second end of the second balance pipe is connected to the third end of the fourth valve of the third heat exchanger group, and the third end of the first valve of the third heat exchanger group is connected to the second balance pipe.

[0017] Optionally, the indoor unit further includes: a controller, which is electrically connected to the multiple valves of the valve group and is used to control the on and off of the valves.

[0018] The embodiment of the present disclosure further provides an air-conditioning system, which further includes an indoor unit as described in any one of the above embodiments.

[0019] The indoor unit and air conditioning system provided by the embodiments of the present disclosure can achieve the following technical effects:

[0020] The disclosed embodiment includes a plurality of heat exchanger units, and at least two of the plurality of heat exchanger units are located in different spaces. A plurality of valves can adjust the state of the refrigerant flowing into the plurality of heat exchangers in the heat exchanger unit, and can control the connection or disconnection of each heat exchanger in each heat exchanger unit with the refrigerant in different states, so that each heat exchanger in each heat exchanger unit can be adjusted to be in a cooling, heating or dehumidifying state, thereby realizing different temperature adjustment modes and humidity adjustment modes for a plurality of spaces at the same time. Moreover, the plurality of heat exchanger units are arranged in parallel or in series, so that the indoor unit of the disclosed embodiment is still a two-pipe unit, which does not increase the size of the outdoor unit and reduces the cost of the air conditioning system.

[0021] The above general description and the following description are exemplary and explanatory only and are not intended to limit the present application. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] One or more embodiments are exemplarily described by corresponding drawings, which do not limit the embodiments. Elements with the same reference numerals in the drawings are shown as similar elements, and the drawings do not constitute a scale limitation, and wherein:

[0023] Figure 1 is a structural schematic diagram of an air conditioning system provided by an embodiment of the present disclosure;

[0024] Figure 2 is a schematic diagram of the operating structure of an air-conditioning system in a cooling state provided by an embodiment of the present disclosure;

[0025] Figure 3 yes Figure 2 The enlarged structural diagram of the indoor unit in the middle;

[0026] Figure 4 is a schematic diagram of the operating structure of an air-conditioning system in a heating state provided by an embodiment of the present disclosure;

[0027] Figure 5 yes Figure 4 The enlarged structural diagram of the indoor unit in the middle;

[0028] Figure 6 is a schematic diagram of the operating structure of an air conditioning system in heating and heating states provided by an embodiment of the present disclosure;

[0029] Figure 7 yes Figure 6 The enlarged structural diagram of the indoor unit in the middle;

[0030] Figure 8 is a schematic diagram of the operating structure of an air conditioning system in a reheating and dehumidification state provided by an embodiment of the present disclosure;

[0031] Fig. 9 yes Figure 8 The enlarged structural diagram of the indoor unit in the middle;

[0032] Fig.10 It is a schematic diagram of the operating structure of an air conditioning system in the reheating, dehumidification and refrigeration states provided by an embodiment of the present disclosure;

[0033] Fig.11 yes Fig.10 The enlarged structural diagram of the indoor unit in the middle;

[0034] Fig.12 It is a schematic diagram of the operating structure of an air conditioning system in the reheating, dehumidification and heating states provided by an embodiment of the present disclosure;

[0035] Fig.13 yes Fig.12 The enlarged structural diagram of the indoor unit in the middle;

[0036] Fig.14 This is a schematic diagram of the operating structure of an air-conditioning system in a non-stop defrosting and heating state provided by an embodiment of the present disclosure;

[0037] Fig.15 yes Fig.14 The enlarged structural diagram of the indoor unit in the middle;

[0038] Fig.16 It is a schematic diagram of the operating structure of an air conditioning system in reheating and dehumidification, cooling and heating states provided by an embodiment of the present disclosure;

[0039] Fig.17 yes Fig.16 Enlarged structural diagram of the indoor unit in the middle.

[0040] Reference numerals:

[0041] 100, outdoor unit; 101, compressor; 102, outdoor heat exchanger; 103, four-way valve; 200, heat exchanger group; 201, first heat exchanger; 202, second heat exchanger; 203, first valve; 204, second valve; 205, third valve; 206, fourth valve; 207, fifth valve; 300, indoor unit; 301, first heat exchanger group; 302, second heat exchanger group; 303, third heat exchanger group; 304, first balance pipe; 305, second balance pipe. DETAILED DESCRIPTION

[0042] In order to be able to understand the features and technical contents of the embodiments of the present disclosure in more detail, the implementation of the embodiments of the present disclosure is described in detail below in conjunction with the accompanying drawings. The attached drawings are for reference only and are not used to limit the embodiments of the present disclosure. In the following technical description, for the convenience of explanation, a full understanding of the disclosed embodiments is provided through multiple details. However, one or more embodiments can still be implemented without these details. In other cases, to simplify the drawings, well-known structures and devices can be simplified for display.

[0043] The terms "first", "second", etc. in the specification and claims of the disclosed embodiments and the above-mentioned drawings are used to distinguish similar objects, and are not necessarily used to describe a specific order or sequence. It should be understood that the terms used in this way can be interchanged where appropriate to describe the disclosed embodiments here. In addition, the terms "including" and "having" and any variations thereof are intended to cover non-exclusive inclusions.

[0044] In the embodiments of the present disclosure, the terms "upper", "lower", "inside", "middle", "outside", "front", "back" and the like indicate directions or positional relationships based on the directions or positional relationships shown in the accompanying drawings. These terms are mainly intended to better describe the embodiments of the present disclosure and their embodiments, and are not intended to limit the indicated devices, elements or components to have a specific direction, or to be constructed and operated in a specific direction. Moreover, in addition to being used to indicate directions or positional relationships, some of the above terms may also be used to indicate other meanings. For example, the term "upper" may also be used to indicate a certain dependency or connection relationship in certain circumstances. For those of ordinary skill in the art, the specific meanings of these terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0045] In addition, the terms "disposed", "connected", and "fixed" should be understood in a broad sense. For example, "connected" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection, or an electrical connection; it can be a direct connection, or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, elements, or components. For those of ordinary skill in the art, the specific meanings of the above terms in the embodiments of the present disclosure can be understood according to specific circumstances.

[0046] Unless otherwise stated, the term "plurality" means two or more.

[0047] The term "and / or" is a description of the association relationship between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or, A and B.

[0048] It should be noted that, in the absence of conflict, the embodiments and features in the embodiments of the present disclosure may be combined with each other.

[0049] The connecting lines between the valves and heat exchangers of the indoor unit in the attached figure, the thick line represents the refrigerant before throttling of the indoor unit, the thin line represents the refrigerant after throttling in the indoor unit, and the dotted line represents a blocked pipeline.

[0050] Combination Figures 1 to 17 As shown, an embodiment of the present disclosure provides an air-conditioning system, which includes an indoor unit 300 and an outdoor unit 100 connected to each other, the indoor unit 300 includes a heat exchanger group 200, and the outdoor unit 100 includes an outdoor heat exchanger 102, a compressor 101, a throttling device and a four-way valve 103 connected to each other, the outdoor heat exchanger 102, the compressor 101, the throttling device and the heat exchanger group 200 form a refrigerant circulation loop, wherein the four-way valve 103 can change the refrigerant flow direction in the refrigerant circulation loop to achieve switching between cooling and heating modes of the air-conditioning system.

[0051] The embodiment of the present disclosure provides an indoor unit 300, which includes a heat exchanger group 200 and a valve group. There are multiple heat exchanger groups 200, which are arranged in parallel or in series, and each heat exchanger group 200 includes at least two heat exchangers arranged in series. At least two heat exchanger groups 200 in the multiple heat exchanger groups 200 are located in different spaces. The valve group is the same in number as the heat exchanger group 200 and corresponds to each other one by one. The valve group includes multiple valves, which are used to adjust the refrigerant state of the multiple heat exchangers flowing into the heat exchanger group 200.

[0052] In the disclosed embodiment, multiple heat exchanger groups 200 are arranged in parallel or in series, so that the indoor unit 300 still has two pipes (two pipes refer to two pipes connecting the indoor unit and the outdoor unit), which can be used with a variety of models such as commercial multi-connected units, household small multi-connected units or unit units, solving the problem that unconventional models such as three-pipe (three-pipe refers to three copper pipes connecting the indoor unit and the outdoor unit) reheat need to be matched with a special outdoor unit, thereby reducing the cost of the air conditioning system. Each heat exchanger group 200 is correspondingly provided with a valve group, and multiple valves are used to adjust the state of the refrigerant flowing into the heat exchanger group 200. In this way, the refrigerant flowing in each heat exchanger in the multiple heat exchanger groups 200 can be adjusted, and then the temperature of each heat exchanger group 200 in each heat exchanger group 200 can be adjusted to achieve different functions such as temperature adjustment and dehumidification. At least two heat exchanger groups 200 in the multiple heat exchanger groups 200 are located in different spaces, so that the function of differential temperature and humidity adjustment for multiple spaces can be achieved at the same time.

[0053] Here, the multiple spaces may be multiple rooms, multiple residential residences or commercial places, etc.

[0054] Optionally, the number of heat exchanger groups 200 is greater than or equal to the number of spaces, that is, at least one heat exchanger group 200 is provided in each space.

[0055] Optionally, a plurality of valves are used to control the connection and disconnection between the plurality of heat exchanger groups 200 , between the heat exchanger group 200 and the outdoor unit 100 , and between the plurality of heat exchangers in each heat exchanger group 200 .

[0056] The valve group includes multiple valves, which can control the on-off between multiple heat exchanger groups 200, control the on-off between the heat exchanger group 200 and the outdoor unit 100, and control the on-off of multiple heat exchangers in the heat exchanger group 200. In this way, the refrigerant flowing in each heat exchanger in the multiple heat exchanger groups 200 can be adjusted, and then the temperature of each heat exchanger group 200 in each heat exchanger group 200 can be adjusted to achieve different temperature control, dehumidification, defrosting and other functions.

[0057] Optionally, the indoor unit 300 defines an air duct, and the indoor unit 300 also includes an indoor fan, which drives the airflow to flow in the air duct, wherein the multiple heat exchanger groups include a first heat exchanger group and a second heat exchanger group, and each heat exchanger group 200 includes a first heat exchanger 201 and a second heat exchanger 202, and the first heat exchanger 201 and the second heat exchanger 202 are located in the air duct, and the first heat exchanger 201 and the second heat exchanger 202 are arranged in sequence along the flow direction of the airflow in the air duct.

[0058] Alternatively, if Figure 1 As shown, each heat exchanger group 200 includes a first heat exchanger 201 and a second heat exchanger 202 arranged in series, and the valve group includes a first valve 203, a second valve 204, a third valve 205, a fourth valve 206 and a fifth valve 207. The first end of the first valve 203 is suitable for connecting with the first end of the outdoor unit 100, and the second end of the first valve 203 is connected to the first end of the first heat exchanger 201; the second valve 204 is connected between the second end of the first valve 203 and the first end of the first heat exchanger 201; the third valve 205 is connected between the second end of the first heat exchanger 201 and the first end of the second heat exchanger 202; the first end of the fourth valve 206 is connected to the second end of the second heat exchanger 202, and the second end of the fourth valve 206 is suitable for connecting with the second end of the outdoor unit 100; the fifth valve 207 is connected between the second end of the first valve 203 and the second end of the outdoor unit 100.

[0059] In the disclosed embodiment, the first valve 203 connects the outdoor unit 100 and the first heat exchanger 201, and the refrigerant of the outdoor unit 100 can flow into the first heat exchanger 201 through the first valve 203, or the refrigerant in the first heat exchanger 201 can flow into the outdoor unit 100 through the first valve 203. The second valve 204 is located between the first valve 203 and the first heat exchanger 201, and can control the refrigerant flow rate of the first valve 203 flowing into the first heat exchanger 201. The third valve 205 is connected between the second end of the first heat exchanger 201 and the first end of the second heat exchanger 202, that is, the first heat exchanger 201 and the second heat exchanger 202 can be connected in series through the third valve 205. The fourth valve 206 is connected between the second heat exchanger 202 and the outdoor unit 100, and the fifth valve 207 is connected between the first heat exchanger 201 and the outdoor unit 100. That is, the first heat exchanger 201 and the second heat exchanger 202 in the heat exchanger group 200 can be connected to the outdoor unit 100, and the fourth valve 206 and the fifth valve 207 are respectively used to realize the connection or disconnection of the second heat exchanger 202 and the fifth heat exchanger with the outdoor unit 100.

[0060] Optionally, the second valve 204 is a throttling device; and / or, the third valve 205 is a throttling device.

[0061] In the disclosed embodiment, the second valve 204 is a throttling device, and the second valve 204 can throttle the refrigerant flowing from the first valve 203 to the first heat exchanger 201 or from the first heat exchanger 201 to the first valve 203. The throttled refrigerant is a low-temperature and low-pressure gas-liquid two-phase refrigerant, and the low-temperature and low-pressure refrigerant can flow into the first heat exchanger 201 to absorb heat and cool.

[0062] The third valve 205 is a throttling device, so that the refrigerant in one of the first heat exchanger 201 and the second heat exchanger 202 can flow into the other heat exchanger after being throttled by the third valve 205. In this way, the temperatures of the first heat exchanger 201 and the second heat exchanger 202 in a heat exchanger group 200 are different, and the two heat exchangers can realize different functions, such as cooling and dehumidification or heating and dehumidification.

[0063] Optionally, at least one of the second valve 204 and the third valve 205 in at least one heat exchanger group 200 is a throttling device.

[0064] In the embodiment of the present disclosure, when there are multiple heat exchanger groups 200, there is at least one heat exchanger group 200 among the multiple heat exchanger groups 200, and at least one of the second valve 204 and the third valve 205 in the heat exchanger group 200 is a throttling device. One of the second valve 204 and the third valve 205 of the other heat exchanger groups 200 among the multiple heat exchanger groups 200 is a throttling device, or the second valve 204 and the third valve 205 in the other heat exchanger groups 200 are not throttling devices.

[0065] It should be noted that when multiple heat exchanger groups 200 all include throttling devices, the throttling devices in the multiple heat exchanger groups 200 can all be the second valve 204 or all be the third valve 205, or can be the second valve 204 and the third valve 205 respectively. In actual use, the second valve 204 and the third valve 205 can be set according to the operating mode of the indoor unit 300.

[0066] Optionally, the indoor unit 300 further includes a controller, which is electrically connected to the plurality of valves of the valve group, and is used to control the on and off of the valves.

[0067] In the disclosed embodiment, the controller is electrically connected to the first valve 203, the second valve 204, the third valve 205, the fourth valve 206 and the fifth valve 207, and the controller can control the connection path or disconnection state of the first valve 203, the second valve 204, the third valve 205, the fourth valve 206 and the fifth valve 207, thereby realizing differentiated operation of multiple heat exchangers and improving the working mode of the indoor unit 300.

[0068] Alternatively, if Figure 2 and Figure 3 As shown, the operation mode of the indoor unit 300 includes a cooling mode. When the indoor unit 300 operates in the cooling mode, the multiple heat exchanger groups 200 include a first heat exchanger group 301 and a second heat exchanger group 302. The second valve 204 of the first heat exchanger group 301 and the second valve 204 of the second heat exchanger group 302 are both throttling devices. The controller controls the first end and the second end of the first valve 203 in the first heat exchanger group 301 to be connected, and controls the second valve 204 and the third valve 205 to be connected, and controls the first end and the second end of the fourth valve 206 to be connected. At the same time, the controller controls the first end and the second end of the first valve 203 of the second heat exchanger group 302 to be connected, and controls the first end and the second end of the fourth valve 206 of the second heat exchanger group 302 to be connected, and controls the second valve 204 and the third valve 205 of the second heat exchanger group 302 to be opened.

[0069] At this time, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant after flowing through the compressor 101 in the outdoor unit 100. The gaseous refrigerant enters the outdoor heat exchanger 102 and becomes a liquid refrigerant after sufficient heat exchange. The liquid refrigerant passes through the first ends of the first valves 203 of the two heat exchanger groups 200 and flows to the corresponding second valves 204 respectively. The second valve 204 throttles the liquid refrigerant to become a low-temperature and low-pressure gas-liquid two-phase mixed refrigerant and then flows into the corresponding first heat exchanger 201, and then flows into the second heat exchanger 202 through the corresponding third valve 205. At this time, the first heat exchanger 201 and the second heat exchanger 202 can both exchange heat with the indoor airflow, provide cooling to the indoor room, and realize the refrigeration function, and then flow back to the compressor 101 of the outdoor unit 100 through their respective corresponding fourth valves 206, thus forming a refrigeration cycle. This not only realizes the cooling function of multiple rooms, but also makes full use of the heat exchange area of ​​the coils of the first heat exchanger 201 and the second heat exchanger 202.

[0070] It should be noted that the number of heat exchanger groups 200 can be not only two, but also other numbers, such as three, four or five. Multiple heat exchanger groups are arranged in parallel, so that multiple heat exchanger groups can realize the cooling mode at the same time.

[0071] Alternatively, if Figure 4 and Figure 5As shown, the working mode of the indoor unit 300 includes a heating mode. When the indoor unit 300 operates in the heating mode, the four-way valve 103 of the outdoor unit 100 changes the refrigerant flow direction of the refrigerant circulation loop. At this time, the outdoor heat exchanger 102 is an evaporator and the heat exchanger group 200 is a condenser. The multiple heat exchanger groups 200 include a first heat exchanger group 301 and a second heat exchanger group 302. The second valve 204 of the first heat exchanger group 301 and the second valve 204 of the second heat exchanger group 302 are both throttling devices. At this time, the controller controls the first end of the first valve 203 of the first heat exchanger group 301 and the second end of the first valve 203 to be connected, and controls the first end of the fourth valve 206 of the first heat exchanger group 301 and the second end of the fourth valve 206 to be connected, and controls the second valve 204 and the third valve 205 of the first heat exchanger group 301 and the second heat exchanger group 302 to be opened.

[0072] At this time, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant through the compressor 101. The high-temperature and high-pressure gaseous refrigerant flows into the corresponding second heat exchanger 202 through the second end of the fourth valve 206 of the first heat exchanger group 301 and the second heat exchanger group 302, and then flows out of the second heat exchanger 202 through the third valve 205 and flows into the corresponding first heat exchanger 201. The first heat exchanger 201 and the second heat exchanger 202 can both exchange heat with the indoor airflow to heat the indoor. The liquid refrigerant flowing out of the first heat exchanger 201 is throttled by the second valve 204 corresponding to each heat exchanger group 200, and becomes a low-temperature and low-pressure gaseous refrigerant, and then flows into the outdoor heat exchanger 102 of the outdoor unit 100 through the first end of the first valve 203 corresponding to each heat exchanger group 200, and then returns to the compressor 101, thus forming a heating cycle. In this way, the heat exchange areas of the first heat exchanger 201 and the second heat exchanger 202 of a heat exchanger group 200 under heating conditions are fully utilized.

[0073] It should be noted that the number of heat exchanger groups 200 can be not only two, but also other numbers, such as three, four or five. Multiple heat exchanger groups are arranged in parallel, so that multiple heat exchanger groups can realize the heating mode at the same time.

[0074] Optionally, the first valve 203 and / or the fourth valve 206 is a three-way reversing valve, which can increase the working mode of the indoor unit 300 and improve the user experience.

[0075] Alternatively, if Figure 6 and Figure 7As shown, the first valve 203 of the first heat exchanger group 301 and the fourth valve 206 of the second heat exchanger group 302 are both three-way reversing valves, and the third end of the first valve 203 of the first heat exchanger group 301 is connected to the third end of the fourth valve 206 of the second heat exchanger group 302.

[0076] In the embodiment of the present disclosure, the indoor unit 300 can operate in a cooling and heating mode, and the multiple heat exchanger groups 200 include a first heat exchanger group 301 and a second heat exchanger group 302, and the second valve 204 of the first heat exchanger group 301 is a throttling device. At this time, the controller controls the second end of the first valve 203 of the first heat exchanger group 301 to be connected to the third end of the first valve 203, controls the first end of the fourth valve 206 of the first heat exchanger group 301 to be connected to the second end of the fourth valve 206, controls the second valve 204 of the first heat exchanger group 301 to be connected to the third valve 205, and controls the first end and the second end of the fourth valve 206 of the first heat exchanger group 301 to be connected. At the same time, the controller controls the first end of the fourth valve 206 of the second heat exchanger group 302 to be connected to the third end of the fourth valve 206, controls the first end and the second end of the first valve 203 of the second heat exchanger group 302 to be connected, and controls the second valve 204 and the third valve 205 of the second heat exchanger group 302 to be opened.

[0077] At this time, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 101. The high-temperature and high-pressure gaseous refrigerant flows into the outdoor heat exchanger 102 to form a gas-liquid two-phase refrigerant after heat exchange. The gas-liquid two-phase refrigerant flows into the second heat exchanger group 302 through the first valve 203 of the second heat exchanger group 302. The high-temperature and high-pressure gaseous refrigerant flowing out of the second end of the first valve 203 of the second heat exchanger group 302 passes through the second valve 204 corresponding to the second heat exchanger group 302 and then flows through the first heat exchanger 201, the third valve 205 and the second heat exchanger 202 corresponding to the second heat exchanger group 302 in sequence. In this way, heat exchange is performed on the air in the space corresponding to the second heat exchanger group 302 to achieve heating of the space corresponding to the second heat exchanger group 302. The liquid refrigerant after heat exchange in the second heat exchanger 202 of the second heat exchanger group 302 flows into the third end of the first valve 203 of the first heat exchanger group 301 through the third end of the fourth valve 206 of the second heat exchanger group 302, and then flows from the second end of the first valve 203 of the first heat exchanger group 301 to the second valve 204 of the first heat exchanger group 301. After throttling by the second valve 204 of the first heat exchanger group 301, it becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant and then flows into the first heat exchanger 201, the third valve 205 and the second heat exchanger 202 of the first heat exchanger group 301 in sequence, thereby cooling the space corresponding to the first heat exchange group. The refrigerant after heat exchange flows back to the compressor 101 of the outdoor unit 100 through the first end and the third end of the third valve 205 of the first heat exchanger group 301.

[0078] It should be noted that the number of heat exchanger groups 200 can be not only two, but also other numbers, such as three, four or five. Multiple heat exchanger groups are arranged in series, so that multiple heat exchanger groups can realize cooling and heating modes at the same time.

[0079] Alternatively, if Figure 8 and Fig. 9 As shown, the fourth valve 206 of the first heat exchanger group 301, the first valve 203 of the second heat exchanger group 302 and the fourth valve 206 of the second heat exchanger group 302 are all three-way reversing valves, and the third end of the fourth valve 206 of the first heat exchanger group 301 is connected to the third end of the fourth valve 206 of the second heat exchanger group 302, wherein the third end of the first valve 203 of the second heat exchanger group 302 is connected to the third end of the fourth valve 206 of the first heat exchanger group 301 and the fourth valve 206 of the second heat exchanger group 302.

[0080] In the embodiment of the present disclosure, the working mode of the indoor unit 300 includes a reheat dehumidification mode. When the indoor unit 300 operates in the reheat dehumidification mode, the multiple heat exchanger groups 200 include a first heat exchanger group 301 and a second heat exchanger group 302. The third valve 205 of the first heat exchanger group 301 and the third valve 205 of the second heat exchanger group 302 are both throttling devices. At this time, the controller controls the first end and the third end of the first valve 203 of the second heat exchanger group 302 to be connected, and controls the first end and the third end of the fourth valve 206 of the first heat exchanger group 301 and the second heat exchanger group 302 to be connected, and at the same time controls the second valve 204, the third valve 205 and the fifth valve 207 of the first heat exchanger group 301 and the second heat exchanger group 302 to be opened.

[0081] Here, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 101. The high-temperature and high-pressure gaseous refrigerant flows into the outdoor heat exchanger 102 to form a gas-liquid two-phase refrigerant after heat exchange. The gas-liquid two-phase refrigerant flows into the first end of the first valve 203 of the second heat exchanger group 302, and then flows from the third end of the first valve 203 of the second heat exchanger group 302 to the third end of the fourth valve 206 of the first heat exchanger group 301 and the third end of the fourth valve 206 of the second heat exchanger group 302 respectively. Then the refrigerant flows from the first end of the fourth valve 206 of the first heat exchanger group 301 into the second heat exchanger 202 of the first heat exchanger group 301. At the same time, the refrigerant flows from the first end of the fourth valve 206 of the second heat exchanger group 302 to the second heat exchanger 202 of the second heat exchanger group 302. In this way, the second heat exchangers 202 of the two heat exchanger groups 200 can exchange heat with the air in their respective spaces, release heat, and perform heating. After the refrigerant has undergone heat exchange in the second heat exchanger 202 in the two heat exchanger groups 200 flows out of the second heat exchanger 202, it flows to the corresponding third valves 205 respectively, and after throttling through the corresponding third valves 205, it becomes a low-temperature and low-pressure gas-liquid two-phase refrigerant, and then flows into the corresponding first heat exchanger 201. The first heat exchanger 201 provides cooling for the corresponding rooms and can perform surface cooling and dehumidification. Then, after the refrigerant in the first heat exchanger 201 flows out, it passes through the corresponding second valves 204 and fifth valves 207 in turn and flows out of the outdoor unit 100, and flows back to the compressor 101 of the outdoor unit 100, thus forming a reheat dehumidification cycle.

[0082] Here, the first heat exchanger 201 and the second heat exchanger 202 are arranged along the flow direction of the airflow in the air duct, so that the airflow is dehumidified by the first heat exchanger 201 and then heated by the second heat exchanger 202 to achieve constant temperature and humidity control and improve the user experience.

[0083] It should be noted that the number of heat exchanger groups 200 can be not only two, but also other numbers, such as three, four or five. Multiple heat exchanger groups are arranged in parallel, so that multiple heat exchanger groups can realize the reheat dehumidification mode at the same time.

[0084] Alternatively, if Fig.10 and Fig.11 As shown, the first valve 203 of the first heat exchanger group 301 is a three-way reversing valve, and the third end of the first valve 203 of the first heat exchanger group 301 is connected to the third end of the fourth valve 206 of the first heat exchanger group 301, so that in addition to the refrigerant flowing into the first heat exchanger group 301 through the first valve 203 of the second heat exchanger group 302, the refrigerant can also flow into the first heat exchanger group 301 through the first valve 203, thereby improving the reheat dehumidification efficiency of the first heat exchanger group 301.

[0085] Alternatively, if Figure 6 As shown, the first valve 203 and the fourth valve 206 of the first heat exchanger group 301 are three-way reversing valves, and the third end of the first valve 203 of the first heat exchanger group 301 is connected to the third end of the fourth valve 206 of the first heat exchanger group 301.

[0086] In the embodiment of the present disclosure, the working modes of the indoor unit 300 include reheat dehumidification and cooling modes. When the indoor unit 300 operates in the reheat dehumidification and cooling modes, the multiple heat exchanger groups 200 include a first heat exchanger group 301 and a second heat exchanger group 302. The third valve 205 of the first heat exchanger group 301 and the second valve 204 of the second heat exchanger group 302 are both throttling devices. At this time, the controller controls the first end and the third end of the first valve 203 of the first heat exchanger group 301 to be connected, controls the first end and the third end of the fourth valve 206 of the first heat exchanger group 301 to be connected, and controls the second valve 204, the third valve 205 and the fifth valve 207 of the first heat exchanger group 301 to be opened. At the same time, the controller controls the first end and the second end of the first valve 203 of the second heat exchanger group 302 to be connected, controls the first end and the second end of the fourth valve 206 of the second heat exchanger group 302 to be connected, and controls the second valve 204 and the third valve 205 of the second heat exchanger group 302 to be opened.

[0087] Here, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 101. The high-temperature and high-pressure gaseous refrigerant flows into the outdoor heat exchanger 102 to form a gas-liquid two-phase refrigerant after heat exchange. A part of the gas-liquid two-phase refrigerant flows into the second heat exchanger 202 of the first heat exchanger group 301 through the first valve 203 and the fourth valve 206 of the first heat exchanger group 301 in turn, so that the second heat exchanger 202 can release heat for heating. The refrigerant flowing out of the second heat exchanger 202 of the first heat exchanger group 301 becomes a low-temperature and low-pressure refrigerant after being throttled by the third valve 205 of the first heat exchanger group 301, and then flows into the first heat exchanger 201 of the first heat exchanger group 301, so that the first heat exchanger 201 can release cold energy and realize the surface cooling and dehumidification function, and then flows into the compressor 101 of the outdoor unit 100 through the second valve 204 and the fifth valve 207 of the first heat exchanger group 301, so that the first heat exchanger group 301 realizes the reheating and dehumidification function for its corresponding space. At the same time, another part of the two-phase refrigerant flowing out of the outdoor heat exchanger 102 passes through the first valve 203 of the second heat exchanger group 302 and flows into the second heat exchanger group 302. The refrigerant passes through the first valve 203 and flows through the second valve 204 of the second heat exchanger group 302 for throttling, and becomes a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant flows through the first heat exchanger 201, the third valve 205 and the second heat exchanger 202 of the second heat exchanger group 302 in turn. The first heat exchanger 201 and the second heat exchanger 202 can cool the space corresponding to the second heat exchanger group 302, and then the refrigerant flowing out of the second heat exchanger 202 passes through the fourth valve 206 of the second heat exchanger group 302 and flows back to the compressor 101 of the outdoor unit 100. In this way, multiple heat exchanger groups 200 form a cycle of reheat dehumidification and refrigeration mode.

[0088] It should be noted that the number of heat exchanger groups 200 can be not only two, but also other numbers, such as three, four or five. Multiple heat exchanger groups that can simultaneously realize reheat dehumidification and refrigeration modes belong to optional embodiments of the present application.

[0089] Alternatively, if Fig.12 and Fig.13 As shown, the first valve 203 and the fourth valve 206 of the first heat exchanger group 301 are three-way reversing valves, and the third end of the first valve 203 of the first heat exchanger group 301 is connected to the third end of the fourth valve 206 of the first heat exchanger group 301; and the first valve 203 and the fourth valve 206 of the second heat exchanger group 302 are both three-way reversing valves, and the third end of the first valve 203 of the second heat exchanger group 302 is connected to the third end of the fourth valve 206 of the second heat exchanger group 302.

[0090] In the embodiment of the present disclosure, the working mode of the indoor unit 300 also includes a reheat dehumidification and heating mode. When the indoor unit 300 operates in the reheat dehumidification and heating mode, the multiple heat exchanger groups 200 include a first heat exchanger group 301 and a second heat exchanger group 302. The third valve 205 of the first heat exchanger group 301 and the second valve 204 of the second heat exchanger group 302 are both throttling devices. At this time, the controller controls the first end and the third end of the first valve 203 of the first heat exchanger group 301 to be connected, controls the first end and the third end of the fourth valve 206 of the first heat exchanger group 301 to be connected, and controls the second valve 204, the third valve 205 and the fifth valve 207 to be opened. At the same time, the controller controls the first end and the third end of the first valve 203 of the second heat exchanger group 302 to be connected, controls the first end and the third end of the fourth valve 206 of the second heat exchanger group 302 to be connected, and controls the second valve 204, the third valve 205 and the fifth valve 207 of the second heat exchanger group 302 to be connected.

[0091] Here, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 101. The high-temperature and high-pressure gaseous refrigerant flows into the outdoor heat exchanger 102 to form a gas-liquid two-phase refrigerant after heat exchange. A part of the gas-liquid two-phase refrigerant flows into the second heat exchanger 202 of the first heat exchanger group 301 through the first valve 203 and the fourth valve 206 of the first heat exchanger group 301. The second heat exchanger 202 releases heat for heating. Then, the refrigerant flowing out of the second heat exchanger 202 passes through the third valve 205 of the first heat exchanger group 301 and becomes a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant flows into the first heat exchanger 201 of the first heat exchanger group 301 again for refrigeration and dehumidification. Then, the refrigerant flowing out of the first heat exchanger 201 flows back to the compressor 101 of the outdoor unit 100 through the second valve 204 and the fifth valve 207. At the same time. Another part of the gas-liquid two-phase refrigerant flowing out of the outdoor unit 100 passes through the first valve 203 and the fourth valve 206 of the second heat exchanger group 302, and flows through the second heat exchanger 202, the third valve 205 and the first heat exchanger 201 of the second heat exchanger group 302 in sequence. The first heat exchanger 201 and the second heat exchanger 202 of the second heat exchanger group 302 can heat the space corresponding to the second heat exchanger group 302, and then the refrigerant flowing out of the first heat exchanger 201 is throttled by the second valve 204 of the second heat exchanger group 302 to become a low-temperature and low-pressure refrigerant, and then flows back to the compressor 101 of the outdoor unit 100 through the fifth valve 207, realizing the cycle of reheat dehumidification and heating mode.

[0092] It should be noted that the number of heat exchanger groups 200 can be not only two, but also other numbers, such as three, four or five. Multiple heat exchanger groups that can simultaneously realize reheat dehumidification and refrigeration modes belong to optional embodiments of the present application.

[0093] Alternatively, if Fig.14 and Fig.15 As shown, the working mode of the indoor unit 300 also includes a non-stop defrosting and heating mode. When the indoor unit 300 operates in the non-stop defrosting and heating mode, the multiple heat exchanger groups 200 include a first heat exchanger group 301 and a second heat exchanger group 302. The second valve 204 of the first heat exchanger group 301 is a throttling device, and the second valve 204 of the second heat exchanger group 302 is a throttling device. At this time, the controller controls the first end and the third end of the first valve 203 in the first heat exchanger group 301 to be connected, controls the first end and the third end of the fourth valve 206 in the first heat exchanger group 301 to be connected, and controls the second valve 204, the third valve 205 and the fifth valve 207 of the first heat exchanger group 301 to be connected. At the same time, the controller controls the first end and the third end of the first valve 203 in the second heat exchanger group 302 to be connected, controls the first end and the third end of the fourth valve 206 in the second heat exchanger group 302 to be connected, and controls the second valve 204, the third valve 205 and the fifth valve 207 in the second heat exchanger group 302 to be connected.

[0094] Here, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 101. The high-temperature and high-pressure gaseous refrigerant flows into the outdoor heat exchanger 102 to form a gas-liquid two-phase refrigerant after heat exchange. The gas-liquid two-phase refrigerant flows into the first heat exchanger group 301 and the second heat exchanger group 302 respectively. In the first heat exchanger group 301, the gas-liquid two-phase refrigerant flows into the second heat exchanger 202 through the first valve 203 and the fourth valve 206, and then the refrigerant flows through the second heat exchanger 202, the third valve 205 and the first heat exchanger 201 in sequence, so that the first heat exchanger 201 and the second heat exchanger 202 release heat to defrost and heat at the same time. The refrigerant flowing out of the first heat exchanger 201 becomes a low-temperature and low-pressure refrigerant after throttling by the second valve 204 and then flows back to the compressor 101 of the outdoor unit 100 through the fifth valve 207. Similarly, in the second heat exchanger group 302, the gas-liquid two-phase refrigerant flows into the second heat exchanger 202 through the first valve 203 and the fourth valve 206, and then the refrigerant flows through the second heat exchanger 202, the third valve 205 and the first heat exchanger 201 in sequence, so that the first heat exchanger 201 and the second heat exchanger 202 release heat to defrost and heat at the same time. The refrigerant flowing out of the first heat exchanger 201 is throttled by the second valve 204 to become a low-temperature and low-pressure refrigerant, and then flows back to the compressor 101 of the outdoor unit 100 through the fifth valve 207. In this way, the cycle of the defrosting and heating modes without stopping the machine is realized.

[0095] It should be noted that the number of heat exchanger groups 200 can be not only two, but also other numbers, such as three, four, five or six. Multiple heat exchanger groups that can simultaneously realize non-stop defrosting and heating modes belong to optional embodiments of the present application.

[0096] Optionally, the indoor unit 300 further includes a balancing pipe, which is connected between the heat exchangers corresponding to at least two heat exchanger groups 200 .

[0097] In the disclosed embodiment, the balance pipe is connected between the heat exchangers in the multiple heat exchanger groups 200, thereby realizing the connection between different heat exchanger groups 200, so that the multiple heat exchanger groups 200 can be connected, and then the multiple heat exchanger groups 200 can be connected. After the multiple heat exchanger groups 200 are connected, the refrigerant states flowing into the multiple heat exchangers can be different through the control of the valve, thereby realizing more diversified temperature and humidity control modes.

[0098] Optionally, the first valve 203 and the fourth valve 206 are both three-way reversing valves, and the indoor unit 300 further includes a first balancing pipe 304, the first balancing pipe 304 is connected between the third end of the first valve 203 of the first heat exchanger group 301 and the third end of the fourth valve 206 of the second heat exchanger group 302, and the third end of the fourth valve 206 of the first heat exchanger group 301 and the third end of the first valve 203 of the second heat exchanger group 302 are both connected to the first balancing pipe 304. The balancing pipe includes the first balancing pipe 304.

[0099] In the embodiment of the present disclosure, the first balance pipe 304 is connected between the third end of the first valve 203 of the first heat exchanger group 301 and the third end of the fourth valve 206 of the second heat exchanger group 302, so that the first heat exchanger group 301 and the second heat exchanger group 302 can be connected by adjusting the first valve 203 and the fourth valve 206, and at the same time, the third end of the fourth valve 206 of the first heat exchanger group 301 and the third end of the first valve 203 of the second heat exchanger group are also connected to the first balance pipe 304. In this way, the first heat exchanger 201 and the second heat exchanger 202 of the first heat exchanger group 301 and the first heat exchanger 201 and the second heat exchanger 202 of the second heat exchanger group 302 can be connected through the first balance pipe 304. In this way, the refrigerant flow path of the indoor unit 300 is increased, and the working mode of the indoor unit 300 is increased. Moreover, through the setting of the first balancing pipe 304, and the first valve 203 and the fourth valve 206 are both three-way valves, by controlling the on and off of multiple valves, the indoor unit 300 can be switched among the above-mentioned cooling mode, heating mode, cooling and heating mode, reheat dehumidification mode, reheat dehumidification and cooling mode, and reheat dehumidification and heating mode. There is no need to change the pipeline of the indoor unit 300, the working mode of the indoor unit 300 is increased, and the differentiated working modes of cooling and heating of the indoor unit 300 in the same spatial area and at the same time are realized.

[0100] Alternatively, if Fig.16 and Fig.17As shown, the indoor unit 300 further includes a third heat exchanger group 303. At this time, the indoor unit 300 includes reheat dehumidification, heating and cooling modes, and the indoor unit 300 operates reheat dehumidification. In heating and cooling modes, the multiple heat exchanger groups 200 include a first heat exchanger group 301, a second heat exchanger group 302 and a third heat exchanger group 303. The third valve 205 of the first heat exchanger group 301 is a throttling device, the second valve 204 in the second heat exchanger group 302 is a throttling device, and the second valve 204 of the third heat exchanger group 303 is a throttling device. At this time, the controller controls the first end and the third end of the first valve 203 in the first heat exchanger group 301 to be connected, the first end and the third end of the fourth valve 206 to be connected, and controls the second valve 204, the third valve 205 and the fifth valve 207 to be connected. At the same time, the controller controls the first end and the third end of the first valve 203 in the second heat exchanger group 302 to be connected, the first end and the third end of the fourth valve 206 to be connected, and controls the second valve 204, the third valve 205 and the fifth valve 207 to be connected. At the same time, the controller controls the first end and the second end of the first valve 203 in the third heat exchanger group 303 to be connected, the first end and the second end of the fourth valve 206 to be connected, and controls the second valve 204 and the third valve 205 to be connected.

[0101] Here, the low-temperature and low-pressure gaseous refrigerant is compressed into a high-temperature and high-pressure gaseous refrigerant by the compressor 101. The high-temperature and high-pressure gaseous refrigerant flows into the outdoor heat exchanger 102 to form a gas-liquid two-phase refrigerant after heat exchange. The gas-liquid two-phase refrigerant flows into the first heat exchanger group 301, the second heat exchanger group 302 and the third heat exchanger group 303 respectively. In the first heat exchanger group 301, the gas-liquid two-phase refrigerant flows into the second heat exchanger 202 through the first valve 203 and the fourth valve 206 of the first heat exchanger group 301. The second heat exchanger 202 releases heat to heat. The refrigerant flowing out of the second heat exchanger 202 flows into the first heat exchanger 201 after throttling through the third valve 205. The first heat exchanger 201 releases heat to achieve surface cooling and dehumidification. The refrigerant flowing out of the first heat exchanger 201 flows back to the compressor 101 of the outdoor unit 100 through the second valve 204 and the fifth valve 207. In the second heat exchanger group 302, the gas-liquid two-phase refrigerant flows into the second heat exchanger 202 through the first valve 203 and the fourth valve 206, and the second heat exchanger 202 then flows into the first heat exchanger 201 through the third valve 205. The first heat exchanger 201 and the second heat exchanger 202 can release heat for heating at the same time. The refrigerant flowing out of the first heat exchanger 201 is throttled by the second valve 204 and becomes a low-temperature and low-pressure refrigerant, and then flows back to the compressor 101 of the outdoor unit 100 from the fifth valve 207. In the third heat exchanger group 303, the gas-liquid two-phase refrigerant flows through the first valve 203 to the second valve 204. The second valve 204 throttles the refrigerant to form a low-temperature and low-pressure refrigerant. The low-temperature and low-pressure refrigerant flows through the first heat exchanger 201, the third valve 205 and the second heat exchanger 202 in sequence. The first heat exchanger 201 and the second heat exchanger 202 can perform refrigeration, and then the refrigerant flowing out of the second heat exchanger 202 flows back to the compressor 101 through the fourth valve 206. In this way, the cycle of reheat dehumidification, heating and cooling modes is realized.

[0102] It should be noted that the number of heat exchanger groups 200 can be not only three, but also other numbers, such as four, five or six. Multiple heat exchanger groups that can simultaneously realize reheat dehumidification, heating and cooling modes are optional embodiments of the present application.

[0103] Optionally, when the multiple heat exchanger groups 200 also include a third heat exchanger group 303, the balance pipe also includes a second balance pipe 305, the first end of the second balance pipe 305 is connected to the third end of the fourth valve 206 of the second heat exchanger group 302, the second end of the second balance pipe 305 is connected to the third end of the fourth valve 206 of the third heat exchanger group 303, and the third end of the first valve 203 of the third heat exchanger group 303 is connected to the second balance pipe 305.

[0104] In the embodiment of the present disclosure, the third heat exchanger group 303 is connected to the second heat exchanger group 302 through the second balance pipe 305. In this way, the first balance pipe 304 and the second balance pipe 305 are connected at the third end of the fourth valve 206 of the second heat exchanger group 302, so that the three heat exchanger groups 200 are connected through the first balance pipe 304 and the second balance pipe 305. The first valve 203 and the fourth valve 206 of the third heat exchanger group 303 are also connected to the second balance pipe 305, so that the first heat exchanger 201 and the second heat exchanger 202 flowing into the third heat exchanger group 303 can be adjusted. The state of the refrigerant flowing in can also be adjusted, thereby improving the working mode of the indoor unit 300. Through the form of the second balance pipe 305 and the first balance pipe 304, the indoor unit 300 adds reheat dehumidification, heating and cooling modes, which further increases the working mode of the indoor unit 300 and improves the user experience.

[0105] Optionally, the heat exchanger of the heat exchanger group 200 is a fin-and-tube heat exchanger.

[0106] The embodiment of the present disclosure further provides an air conditioning system, which includes the indoor unit 300 of any one of the above embodiments.

[0107] The air conditioning system of the disclosed embodiment includes the indoor unit 300 of any one of the above embodiments, and thus has the beneficial effects of the indoor unit 300 of any one of the above embodiments, which will not be described in detail herein.

[0108] The air conditioning system includes an outdoor unit 100 , and the outdoor unit 100 includes an outdoor heat exchanger 102 , a compressor 101 , a throttling element and a four-way valve 103 .

[0109] Optionally, the first end of the outdoor heat exchanger 102 is connected to the first end of the first valve 203 , and the second end of the outdoor heat exchanger 102 is connected to both the second end of the fourth valve 206 and the second end of the fifth valve 207 .

[0110] Optionally, the outdoor heat exchanger 102 is a heat balance heat exchanger, which acts as an evaporator to absorb outdoor air heat to supplement the system when the terminal heating capacity is greater than the terminal cooling capacity; and acts as a condenser to release excess heat in the system to the outdoor air when the terminal heating capacity is less than the terminal cooling capacity.

[0111] Optionally, the compressor 101 is a variable frequency compressor.

[0112] The above description and the accompanying drawings sufficiently illustrate the embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations may vary. Portions and features of some embodiments may be included in or replace portions and features of other embodiments. The embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from the scope thereof. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An indoor unit, characterized in that: include: There are multiple heat exchanger groups, and the multiple heat exchanger groups are arranged in parallel or in series. At least two of the multiple heat exchanger groups are located in different spaces, wherein each heat exchanger group includes at least two heat exchangers arranged in series. The valve group has the same number as the heat exchanger group and corresponds one to one. The valve group includes a plurality of valves, and the plurality of valves are used to adjust the state of the refrigerant flowing into the plurality of heat exchangers in the heat exchanger group.

2. The indoor unit according to claim 1, characterized in that: The plurality of heat exchanger groups include a first heat exchanger group and a second heat exchanger group, each heat exchanger group includes a first heat exchanger and a second heat exchanger arranged in series, and the valve group includes: a first valve, wherein a first end of the first valve is adapted to be connected to a first end of the outdoor unit, and a second end of the first valve is connected to a first end of the first heat exchanger; a second valve connected between the second end of the first valve and the first end of the first heat exchanger; a third valve connected between the second end of the first heat exchanger and the first end of the second heat exchanger; a fourth valve, wherein a first end of the fourth valve is connected to a second end of the second heat exchanger, and a second end of the fourth valve is suitable for being connected to a second end of the outdoor unit; The fifth valve is connected between the second end of the first valve and the second end of the outdoor unit.

3. The indoor unit according to claim 2, characterized in that: At least one of the second valve and the third valve in at least one heat exchanger group is a throttling device; and / or the first valve and / or the fourth valve is a three-way reversing valve.

4. The indoor unit according to claim 3, characterized in that: The first valve of the first heat exchanger group and the fourth valve of the second heat exchanger group are both three-way reversing valves, and the third end of the first valve of the first heat exchanger group is connected to the third end of the fourth valve of the second heat exchanger group.

5. The indoor unit according to claim 3, characterized in that: The fourth valve of the first heat exchanger group, the first valve of the second heat exchanger group, and the fourth valve of the second heat exchanger group are all three-way reversing valves, and the third end of the fourth valve of the first heat exchanger group is connected to the third end of the fourth valve of the second heat exchanger group, wherein the third end of the first valve of the second heat exchanger group is connected to the third end of the fourth valve of the first heat exchanger group and the fourth valve of the second heat exchanger group.

6. The indoor unit according to claim 3, characterized in that: The first valve and the fourth valve of the first heat exchanger group are both three-way reversing valves, and the third end of the first valve of the first heat exchanger group is connected to the third end of the fourth valve of the first heat exchanger group; and / or, The first valve and the fourth valve of the second heat exchanger group are both three-way reversing valves, and the third end of the first valve of the second heat exchanger group is connected to the third end of the fourth valve of the second heat exchanger group.

7. The indoor unit according to claim 3, characterized in that: The first valve and the fourth valve are both three-way reversing valves. The indoor unit also includes: The first balancing pipe is connected between the third end of the first valve of the first heat exchanger group and the third end of the fourth valve of the second heat exchanger group, and the third end of the fourth valve of the first heat exchanger group and the third end of the first valve of the second heat exchanger group are both connected to the first balancing pipe.

8. The indoor unit according to claim 7, characterized in that: The multiple heat exchanger groups also include a third heat exchanger group, and the balance pipe also includes a second balance pipe, the first end of the second balance pipe is connected to the third end of the fourth valve of the second heat exchanger group, the second end of the second balance pipe is connected to the third end of the fourth valve of the third heat exchanger group, and the third end of the first valve of the third heat exchanger group is connected to the second balance pipe.

9. The indoor unit according to any one of claims 1 to 8, characterized in that: Also includes: The controller is electrically connected to the multiple valves of the valve group and is used to control the on and off of the valves.

10. An air conditioning system, characterized in that: It comprises the indoor unit according to any one of claims 1 to 9.

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