CN219045774U - Indoor unit and air conditioner - Google Patents

Abstract

The utility model discloses an indoor unit and an air conditioner, comprising: the shell, the level sets up the first heat exchanger in the shell, and a plurality of intervals set up the water collector in first heat exchanger below, every two the top of water collector interval department is equipped with the drain board with the leading-in water collector of comdenstion water, the water collector with reserve the space of ventilating between the drain board. According to the utility model, the plurality of water receiving discs and the liquid guide plate are arranged at intervals in the return air inlet, so that the return air inlet heat exchanger, namely the first heat exchanger, can be horizontally placed, and the thickness of the shell is effectively reduced. And a reheat heat exchanger is arranged at the air outlet, and the heat exchanger can be used for heating dehumidified air. And the heat exchange can also be participated in under the heating mode, the heat exchange area of the unit is increased, and the heat exchange efficiency is improved.

Description

Indoor unit and air conditioner

Technical Field

The utility model relates to the technical field of air conditioners, in particular to an indoor unit and an air conditioner.

Background

The ceiling type air conditioner indoor unit is generally arranged on a ceiling which is less utilized in indoor spaces such as a market, a supermarket, an office or a family, and comprises a shell and a heat exchanger arranged in the shell, wherein wind enters an air duct from an air inlet of the shell, and is blown out from an air outlet of the shell to the indoor after heat exchange of the heat exchanger, so that the indoor is refrigerated or heated; and, in general, cool air is discharged from a ceiling, and thus, cool air is spread at a relatively high speed, and in view of the above-mentioned advantages, ceiling-mounted air-conditioning indoor units are increasingly used.

The current mainstream ceiling type air conditioner is in order to ensure the heat exchange effect and make the shell thickness big and be unsuitable for the installation of ordinary family building, and current ceiling type air conditioner, its interior heat exchanger is in order to guarantee that the heat transfer satisfies the user's demand, and its vertical or slope is placed, the design of below water collector of being convenient for, but can greatly increased the thickness of unit, scheme low cost performance. Therefore, it is very necessary to design an air conditioner with small thickness, small installation space and high heat exchange efficiency.

Disclosure of Invention

The utility model provides an indoor unit and an air conditioner, and aims to solve the technical problem that in the prior art, the ceiling type air conditioner is large in thickness due to the arrangement angle of a heat exchanger.

The technical scheme adopted by the utility model is as follows:

the utility model provides an indoor unit, comprising: the shell, the level sets up the first heat exchanger in the shell, and a plurality of intervals set up the water collector in first heat exchanger below, every two the top of water collector interval department is equipped with the drain board with the leading-in water collector of comdenstion water, the water collector with reserve the space of ventilating between the drain board.

Further, the bottom of the shell is provided with an air return opening, the bottom or the side face of the shell is provided with at least one air outlet, the first heat exchanger is located above the air return opening, and a fan is arranged above the first heat exchanger.

Further, the shell is divided into an air return cavity in the middle and air outlet diversion cavities in two sides or around, the bottom of the air return cavity is the air return port, the first heat exchanger is arranged inside, the air inlet surface at the bottom of the fan is opposite to the air return cavity, the air outlet diversion cavities are communicated with the air outlet sides around, and the bottom of the air outlet diversion cavity is the air outlet.

Further, a second heat exchanger which is obliquely arranged is arranged above the air outlet of the shell, and a second water receiving tray corresponding to the second heat exchanger is arranged on the side wall of the shell.

Further, the return air inlet is provided with a return air filter screen.

Further, the return air inlet is provided with a return air deflector group with an adjustable angle.

Further, the air outlet is provided with an air outlet air deflector with an adjustable angle.

Further, the water receiving disc is U-shaped, and the liquid guide plate is inverted V-shaped.

Further, the indoor unit is provided with a first interface, a second interface and a third interface, the first interface is connected with the first heat exchanger through a pipeline, a third throttle valve is arranged on a pipeline between the first interface and the first heat exchanger, the other side of the first heat exchanger is connected with the second interface through a pipeline, the third interface is connected with the second heat exchanger through a pipeline, the other side of the second heat exchanger is communicated with the first interface through a pipeline, and a second throttle valve is arranged on a pipeline on the other side of the second heat exchanger.

The utility model also provides an air conditioner which comprises an outdoor unit and the indoor unit.

Further, the outdoor unit includes: four-way valve A and four-way valve B with D, E, S, C interfaces, and a compressor, an outdoor fan and an outdoor heat exchanger; the air inlet pipe of the compressor is connected with the S port and the C port of the four-way valve A, the E port and the S port of the four-way valve B, and the pipelines of the C port of the four-way valve A and the E port of the four-way valve B are provided with throttling elements; the exhaust pipe of the compressor is connected with the D port of the four-way valve A, the D port of the four-way valve B and the third port of each indoor unit; the C port of the four-way valve B is connected with the outdoor heat exchanger through a pipeline, the outdoor heat exchanger is connected with the first port of each indoor unit through a pipeline, and the E port of the four-way valve A is connected with the second port of each indoor unit through a pipeline.

When the air conditioner operates in a refrigeration mode, the port D of the four-way valve A, B is communicated with the port C, the port E is communicated with the port S, and the second throttle valve is closed; when the air conditioner operates in the constant temperature dehumidification mode, the D port and the C port of the four-way valve A, B are communicated, the E port and the S port are communicated, and the second throttle valve is opened.

When the air conditioner operates in a heating mode, an E port and an S port of the four-way valve A, B are communicated, a D port and a C port are communicated, and the second throttle valve is opened.

Compared with the prior art, the air return port heat exchanger, namely the first heat exchanger, can be horizontally placed by arranging the plurality of water receiving trays and the liquid guide plates at intervals in the air return port, so that the thickness of the shell is effectively reduced. And a reheat heat exchanger is arranged at the air outlet, and the heat exchanger can be used for heating dehumidified air. And the heat exchange can also be participated in under the heating mode, the heat exchange area of the unit is increased, and the heat exchange efficiency is improved.

Drawings

In order to more clearly illustrate the technical solutions of the embodiments of the present utility model, the drawings that are needed in the embodiments or the description of the prior art will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present utility model, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.

Fig. 1 is a schematic structural diagram of an indoor unit according to an embodiment of the present utility model;

fig. 2 is a schematic structural diagram of an air flow direction of an indoor unit according to an embodiment of the present utility model;

FIG. 3 is a schematic diagram of a refrigeration mode according to an embodiment of the present utility model;

FIG. 4 is a schematic diagram of a heating mode according to an embodiment of the present utility model;

fig. 5 is a schematic structural diagram of a constant temperature dehumidification mode in an embodiment of the present utility model.

11. A housing; 111. a water receiving tray; 112. a liquid guide plate; 113. a second water receiving tray; 12. a first heat exchanger; 13. a motor; 14. centrifugal fan blades; 15. a second heat exchanger; 16. a return air filter screen; 17. a return air deflector group; 18. an air outlet air deflector; 19. a water pump;

21. a compressor; 22. a gas-liquid separator; 23. an oil separator; 24. an outdoor heat exchanger; 25. a small valve; 26. a large valve; 27. high-low pressure air pipe valve.

Detailed Description

In order to make the technical problems, technical schemes and beneficial effects to be solved more clear, the utility model is further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are for purposes of illustration only and are not intended to limit the scope of the utility model.

The principles and structures of the present utility model are described in detail below with reference to the drawings and the examples.

The ceiling type air conditioner is installed in a hidden mode, and has the advantages of attractive installation and small occupied space. At present, in order to ensure that heat exchange meets user requirements, an inner heat exchanger of the mainstream ceiling type air conditioner is generally arranged vertically or obliquely, so that a water pan is convenient to design, but the heat exchanger arranged vertically or obliquely can enable the thickness of a shell to be large (the larger the size of the heat exchanger in the vertical direction is, the thicker the thickness of a unit is), so that the heat exchanger is not suitable for the installation of a common household building, and the cost performance of the scheme is low. The utility model provides a ceiling type air conditioner indoor unit, which can horizontally install a heat exchanger, reduce the thickness of an indoor unit, has small installation occupation space and is suitable for various places.

As shown in fig. 1 and 2, the present utility model provides an indoor unit of an air conditioner, including: the housing 11, the first heat exchanger 12, the water receiving tray 111, and the liquid guide plate 112. Most parts of the indoor unit are arranged in the shell 11, an air return opening is arranged at the bottom of the shell 11, and air outlets are arranged on the side surfaces or around the bottom. The first heat exchanger 12 is disposed in the housing 11, specifically, disposed horizontally (i.e., disposed transversely in the length direction and vertically in the thickness direction) in the housing 11 and above the return air inlet; the water receiving tray 111 is disposed in the housing 11 and located below the first heat exchanger 12, and the water receiving tray 111 is disposed in plurality and arranged in a horizontal row below the first heat exchanger 12 at intervals. The bottom surface of the first heat exchanger 12 is also provided with a plurality of liquid guide plates 112, the liquid guide plates 112 are arranged above the interval positions of the two water receiving plates 111, namely, the liquid guide plates 112 are also arranged at intervals and are arranged side by side to form a transverse row, a ventilation space is reserved between each water receiving plate 111 and each liquid guide plate 112, condensed water dropping from the bottom of the first heat exchanger 12 can be guided into the two water receiving plates 111 positioned below the liquid guide plates 112 through the liquid guide plates 112, air flowing from the return air inlet to the first heat exchanger 12 can flow through a gap between the water receiving plates 111, then flows through the ventilation space reserved between the water receiving plates 111 and the liquid guide plates 112, then flows through the gap between the liquid guide plates 112 to reach the first heat exchanger 12 for heat exchange, so that the horizontally placed first heat exchanger 12 can exchange heat normally, and meanwhile, the condensed water dropping from the bottom of the first heat exchanger 12 can be collected by the plurality of water receiving plates. Therefore, the thickness space occupied by the heat exchanger in the shell is reduced, and the shell can be designed to be thinner compared with the existing shell for vertically or obliquely placing the heat exchanger.

The water pan 111 is in a U shape, the liquid guide plate 112 is in an inverted V shape, the U-shaped water pan 111 can ensure the capacity of the water pan 111, and meanwhile, water in the water pan 111 cannot be easily carried out by return air. The water receiving disc and the liquid guide plate can be arranged in other shapes, so long as water receiving and flow guiding can be realized, and meanwhile, condensed water is prevented from directly flowing out of the return air inlet, and the protection scope of the utility model is provided.

The water pump 19 is specifically further disposed in the housing, and the water pump 19 is in communication with each water receiving tray 111 (specifically, may be in communication through a pipeline or in communication through a water receiving tank), so that water in each water receiving tray 111 can be pumped out.

In an embodiment, the middle part of casing 11 bottom surface sets up the return air inlet, set up the air outlet around the casing 11 bottom surface, the internal partition of casing 11 becomes the return air cavity that is located the middle part and is located the air-out water conservancy diversion cavity all around, the bottom of return air cavity is the return air inlet, inside sets up first heat exchanger 12, and set up water collector 111 and the drain board 112 that are located between first heat exchanger and the return air inlet, the fan sets up in the top of first heat exchanger, be located the place that return air cavity and water conservancy diversion cavity are linked together, the top surface at casing 11 can be fixed to the motor 13 of fan, the fan blade of fan is centrifugal fan blade 14, can follow bottom air inlet all around the air-out. The bottom of the flow guiding chamber extends to the bottom of the shell, namely the bottom of the flow guiding chamber is an air outlet. The fan is started to suck fresh air from the return air inlet, pass through the return air cavity and blow out from the air outlet through the flow guide cavity.

The specific structure of the shell is as follows: the bottom plate middle part of casing 11 sets up an return air inlet to set up the round division board along the edge of return air inlet, the inboard of division board encloses into a square or rectangular space, and this space is the return air cavity promptly, and the top of division board inwards buckles and forms an export, and the fan is installed to the position between the top of this export and the casing roof, and the motor 13 of fan can be fixed on the roof of casing, and the export that the centrifugal fan blade 14 of fan enclosed the division board. The space between the outside of division board and the inside wall of casing is the water conservancy diversion wind channel, and the water conservancy diversion wind channel extends to the bottom of casing, is provided with the air outlet around the bottom plate of casing promptly, and the air outlet sets up around the return air inlet in middle part promptly.

Meanwhile, in order to improve the flow guiding effect, a round angle is formed between the top plate and the side plate of the shell (the round angle can be formed by the internal filling material), so that when the fan blows all around, air can flow to the air outlet at the bottom along the direction of the round angle.

In another embodiment, the middle part of casing bottom surface sets up the return air inlet, the position that is located the both sides of return air inlet of casing bottom surface sets up the air outlet, separate into the return air cavity that is located the middle part and the air-out water conservancy diversion cavity that is located the both sides in the casing, the bottom of return air cavity is the return air inlet, inside sets up first heat exchanger, and set up water conservation dish and the liquid guide plate that are located between first heat exchanger and the return air inlet, the fan sets up in the top of first heat exchanger, be located the place that return air cavity and water conservancy diversion cavity are linked together, the fan blade of fan is centrifugal fan blade, air-out all around from bottom air inlet, the bottom of water conservancy diversion cavity is the air outlet. The fan is started to suck fresh air from the return air inlet, pass through the return air cavity and blow out from the air outlet through the flow guide cavity.

The specific structure of the shell is as follows: the bottom plate middle part of casing sets up an return air inlet to set up two division boards along the both sides edge of return air inlet, two inner walls of both sides enclose into a square or rectangular space around the inboard of division board and the casing, and this space is the return air cavity promptly, and the top of division board inwards buckles and forms an export, and the fan is installed to the position between the top of this export and the casing roof, and the fan specifically can be fixed on the roof of casing, and the bottom surface of fan covers the export that the division board encloses. The space between the outside of the division plate and the inner side walls on the left side and the right side of the shell is a diversion air channel, and the bottom plate of the shell is provided with air outlets at the positions on the two sides of the return air inlet.

Meanwhile, in order to improve the flow guiding effect, round corners (can also be formed by filling materials inside) are formed between the top plate of the shell and the side plates at the left side and the right side, so that when the fan blows air around, air can flow to the air outlet at the bottom along the direction of the round corners.

Further, the return air inlet is provided with a return air filter screen 16, impurities in the air can be filtered, and dust is prevented from entering the shell to cause dust and bacteria accumulation to influence the physical health of a user. The return air inlet is also provided with a return air deflector group 17 with adjustable angles, the return air deflector group 17 comprises a row of return air deflectors which are transversely arranged, and corresponding driving assemblies (the return air deflector and the application of the air deflector in an air conditioner are quite common, the specific structural forms of the return air deflector are not described in detail), and the return air deflector group is arranged to adjust the air inlet angle so as to prevent the return air from being unsmooth due to the short circuit of the return air.

Further, the air outlet is provided with an air outlet air deflector 18, the air outlet direction can be adjusted, meanwhile, the second heat exchanger 15 is arranged in the vertical part of the flow guiding cavity, the second heat exchanger 15 is obliquely arranged, the top of the second heat exchanger 15 is attached to the outer side face of the partition plate, the bottom of the second heat exchanger is attached to the inner side wall of the shell, the second water receiving disc 113 corresponding to the second heat exchanger 15 is arranged on the inner wall of the shell, and because the second heat exchanger 15 is obliquely arranged, condensed water can flow along the inclined face of the second heat exchanger 15 towards the bottom face of the inner side wall of the shell, and drops into the second water receiving disc 113. The second water receiving tray 113 can collect condensed water of the second heat exchanger 15 only by extending vertically out of a small part of the inner side wall of the housing, and air flow of the diversion chamber is not affected.

Preferably, the second heat exchanger can be a common copper-aluminum round tube hydrophilic fin type heat exchanger, and also can be a micro-channel heat exchanger.

As shown in fig. 3 to 5, the present utility model also proposes an air conditioner including: at least one air conditioning indoor unit and an outdoor unit.

In a specific embodiment, two air-conditioning indoor units are arranged, the air-conditioning indoor units are three-pipe indoor units, one indoor unit is provided with a first heat exchanger and two second heat exchangers, and the other indoor unit is provided with a first heat exchanger and a second heat exchanger.

The specific pipeline structure of the indoor unit is as follows: the indoor unit is a three-pipe indoor unit, namely, three interfaces are arranged, namely, a first interface J1, a second interface J2 and a third interface J3 are respectively arranged, the first interface J1 is connected with the first heat exchanger 12 through a pipeline, a third throttle valve, namely, an electronic expansion valve EXV3, is arranged on a pipeline between the first interface J1 and the first heat exchanger 12, the other side of the first heat exchanger 12 is connected with the second interface J2 through a pipeline, the third interface J3 is connected with the second heat exchanger 15 through a pipeline, the other side of the second heat exchanger 15 is communicated with the first interface J1 through a pipeline, and a second throttle valve, namely, an electronic expansion valve EXV2, is arranged on a pipeline on the other side of the second heat exchanger 15.

The air conditioner outdoor unit is provided with two four-way valves, namely a four-way valve A and a four-way valve B, each four-way valve is provided with D, E, S, C interfaces, and is further provided with a compressor 21, a gas-liquid separator 22, an oil separator 23, an outdoor fan, an outdoor heat exchanger 24, a large valve 26, a small valve 25 and a first throttle valve (namely an electronic expansion valve EXV 1).

The specific pipeline structure of the outdoor unit is as follows: an air inlet pipe of the compressor 21 is connected with the gas-liquid separator 22, and an exhaust pipe of the compressor 21 is connected with the oil separator 23; the gas-liquid separator 22 is connected with the port S and the port C of the four-way valve a and the port E and the port S of the four-way valve B through pipelines, and in order to enable the four-way valve A, B to be capable of reversing normally, a throttling element is arranged on the pipeline of the port C of the four-way valve a, and a throttling element is arranged on the pipeline of the port E of the four-way valve B, wherein the throttling element can be a throttling valve or the like; the oil separator 23 is connected with the D port of the four-way valve A, the D port of the four-way valve B and the third port J3 of each indoor unit through pipelines, and a high-low pressure air pipe valve 27 is arranged on the pipeline of the oil separator 23 connected with the third port J3 of each indoor unit; the E port of the four-way valve A is connected with a large valve 26 through a pipeline, and the large valve 26 is connected with a second port J2 in each room through a pipeline; the port C of the four-way valve B is connected with the outdoor heat exchanger 24 through a pipeline, the outdoor heat exchanger 24 is connected with the small valve 25 through a pipeline, a first throttle valve, namely an electronic expansion valve EXV1, is arranged on the pipeline of the outdoor heat exchanger 24 connected with the small valve 25, and the small valve 25 is connected with a first interface J1 of each indoor unit through a pipeline.

As shown in fig. 3, in the refrigeration mode, the four-way valve a is powered off, the port D is connected with the port C, and the port S is connected with the port E; the four-way valve B is powered off, the port D is connected with the port C, and the port S is connected with the port E. The electronic expansion valve EXV2 of the three-pipe internal machine is closed, high-pressure gas is condensed into supercooled liquid in the outdoor heat exchanger through the D port and the C port of the four-way valve B, and then enters the second heat exchanger in the three-pipe internal machine to be evaporated and then returns to the compressor through the E port and the S port of the four-way valve A, so that a loop is formed. After the heat in the air passing through the internal machine is absorbed, the refrigerating effect is achieved.

As shown in fig. 4, in the heating mode, the port D is connected to the port E and the port S is connected to the port C in the four-way valve A, B. The high-temperature high-pressure gas discharged by the compressor is divided into two parts, one part enters the first heat exchanger of the internal machine through the big valve, and the other part enters the second heat exchanger through the high-low pressure gas pipe valve. When the unit operates, the indoor air is heated by the common heat exchanger and then further heated by the reheating heat exchanger at the air outlet, so that the heat exchange efficiency of the unit can be improved.

As shown in fig. 5, in the constant temperature dehumidification mode, the four-way valve a is powered off, the port D is connected with the port C, and the port S is connected with the port E; the four-way valve B is powered off, the port D is connected with the port C, and the port S is connected with the port E. The high-pressure gas discharged by the compressor is divided into two parts, one part reaches the inner machine through the high-low pressure gas pipe valve, but in the mode, the electronic expansion valve EXV2 of the three-pipe inner machine is opened, so that the part of the high-pressure gas reaching the inner machine through the high-low pressure gas pipe valve can be condensed by the second heat exchanger on the three-pipe inner machine, thereby heating the air, and the whole indoor air is dehumidified but the temperature is not reduced. And the other part of high-pressure gas is condensed into supercooled liquid in the outdoor heat exchanger through the D port and the C port of the four-way valve B, then enters the first heat exchanger in the three-pipe internal machine to be evaporated, and returns to the compressor through the E port and the S port of the four-way valve A, so that a loop is formed. After the heat in the air passing through the internal machine is absorbed, the refrigerating effect is achieved.

It is noted that the above-mentioned terms are used merely to describe specific embodiments, and are not intended to limit exemplary embodiments according to the present application. As used herein, the singular is also intended to include the plural unless the context clearly indicates otherwise, and furthermore, it is to be understood that the terms "comprises" and/or "comprising" when used in this specification are taken to specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof.

The relative arrangement of the components and steps, numerical expressions and numerical values set forth in these embodiments do not limit the scope of the present application unless it is specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective parts shown in the drawings are not drawn in actual scale for convenience of description. Techniques, methods, and apparatus known to one of ordinary skill in the relevant art may not be discussed in detail, but should be considered part of the specification where appropriate. In all examples shown and discussed herein, any specific values should be construed as merely illustrative, and not a limitation. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numerals and letters denote like items in the following figures, and thus once an item is defined in one figure, no further discussion thereof is necessary in subsequent figures.

In the description of the present application, it should be understood that, where azimuth terms such as "front, rear, upper, lower, left, right", "transverse, vertical, horizontal", and "top, bottom", etc., indicate azimuth or positional relationships generally based on those shown in the drawings, only for convenience of description and simplification of the description, these azimuth terms do not indicate and imply that the apparatus or elements referred to must have a specific azimuth or be constructed and operated in a specific azimuth, and thus should not be construed as limiting the scope of protection of the present application; the orientation word "inner and outer" refers to inner and outer relative to the contour of the respective component itself.

Spatially relative terms, such as "above … …," "above … …," "upper surface at … …," "above," and the like, may be used herein for ease of description to describe one device or feature's spatial location relative to another device or feature as illustrated in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations in use or operation in addition to the orientation depicted in the figures. For example, if the device in the figures is turned over, elements described as "above" or "over" other devices or structures would then be oriented "below" or "beneath" the other devices or structures. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be positioned in other different ways (rotated 90 degrees or at other orientations) and the spatially relative descriptors used herein interpreted accordingly.

In addition, the terms "first", "second", etc. are used to define the components, and are merely for convenience of distinguishing the corresponding components, and unless otherwise stated, the terms have no special meaning, and thus should not be construed as limiting the scope of the present application.

The above description is only of the preferred embodiments of the present utility model and is not intended to limit the present utility model, but various modifications and variations can be made to the present utility model by those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present utility model should be included in the protection scope of the present utility model.

Claims (13)

1. An indoor unit, comprising: the water receiving device comprises a shell, a first heat exchanger horizontally arranged in the shell, and a plurality of water receiving discs arranged below the first heat exchanger at intervals, wherein a liquid guide plate for guiding condensed water into the water receiving discs is arranged above the intervals of the water receiving discs, and a ventilation space is reserved between the water receiving discs and the liquid guide plate.

2. The indoor unit of claim 1, wherein the bottom of the casing is provided with an air return port, the bottom or the side of the casing is provided with at least one air outlet, the first heat exchanger is located above the air return port, and a fan is arranged above the first heat exchanger.

3. The indoor unit of claim 2, wherein the casing is divided into a return air chamber at the middle part and air outlet diversion chambers at two sides or around, the bottom of the return air chamber is the return air inlet, the first heat exchanger is arranged inside, an air inlet surface at the bottom of the fan is opposite to the return air chamber, the air outlet diversion chambers are communicated with air outlet sides around, and the bottom of the air outlet diversion chamber is the air outlet.

4. The indoor unit of claim 1, wherein a second heat exchanger is disposed near an air outlet of the housing in an inclined manner, and a second water pan corresponding to the second heat exchanger is disposed on a side wall of the housing.

5. The indoor unit of claim 2, wherein the return air inlet is provided with a return air filter screen.

6. The indoor unit of claim 2, wherein the return air inlet is provided with an angle-adjustable return air deflector group.

7. The indoor unit of claim 2, wherein the air outlet is provided with an angle-adjustable air outlet deflector.

8. The indoor unit of claim 1, wherein the water pan has a U-shape and the liquid guide plate has an inverted V-shape.

9. The indoor unit of claim 4, wherein the indoor unit is provided with a first interface, a second interface and a third interface, the first interface is connected with the first heat exchanger through a pipeline, a third throttle valve is arranged on a pipeline between the first interface and the first heat exchanger, the other side of the first heat exchanger is connected with the second interface through a pipeline, the third interface is connected with the second heat exchanger through a pipeline, the other side of the second heat exchanger is communicated with the first interface through a pipeline, and a second throttle valve is arranged on a pipeline on the other side of the second heat exchanger.

10. An air conditioner comprising an outdoor unit and the indoor unit according to any one of claims 1 to 9.

11. The air conditioner as set forth in claim 10, wherein the outdoor unit includes: four-way valve A and four-way valve B with D, E, S, C interfaces, and a compressor and an outdoor heat exchanger; the air inlet pipe of the compressor is connected with the S port and the C port of the four-way valve A, the E port and the S port of the four-way valve B, and the pipelines of the C port of the four-way valve A and the E port of the four-way valve B are provided with throttling elements; the exhaust pipe of the compressor is connected with the D port of the four-way valve A, the D port of the four-way valve B and the third port of each indoor unit; the C port of the four-way valve B is connected with the outdoor heat exchanger through a pipeline, the outdoor heat exchanger is connected with the first port of each indoor unit through a pipeline, and the E port of the four-way valve A is connected with the second port of each indoor unit through a pipeline.

12. The air conditioner of claim 11, wherein in the air conditioner operation cooling mode, the D port and the C port of the four-way valve A, B are communicated, the E port and the S port are communicated, and the second throttle valve is closed; when the air conditioner operates in the constant temperature dehumidification mode, the D port and the C port of the four-way valve A, B are communicated, the E port and the S port are communicated, and the second throttle valve is opened.

13. The air conditioner of claim 11, wherein when the air conditioner is operated in a heating mode, the E port and the S port of the four-way valve A, B are communicated, the D port and the C port are communicated, and the second throttle valve is opened.

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