Indoor unit and air conditioner

Abstract

The application discloses an indoor unit and an air conditioner, which comprise a shell, a first heat exchanger horizontally arranged in the shell, and a plurality of water collecting trays which are arranged at intervals below the first heat exchanger. A liquid guide plate for guiding condensed water into the water collecting tray is arranged above the interval between every two water collecting trays. An air venting space is reserved between the water collecting tray and the liquid guide plate. The air return port heat exchanger, i.e. the first heat exchanger, can be horizontally arranged by arranging a plurality of water collecting trays at intervals and arranging the liquid guide plate, so that the thickness of the shell is effectively reduced. A reheating heat exchanger is arranged at the air outlet, and the heat exchanger can be used for heating the dehumidified air. The reheating heat exchanger can also participate in heat exchange in the heating mode, so that the heat exchange area of the unit is increased, and the heat exchange efficiency is improved.

Description

Technical Field

[0001] This invention relates to the field of air conditioning technology, and in particular to an indoor unit and an air conditioner. Background Technology

[0002] Ceiling-mounted air conditioner indoor units are typically installed on the ceiling, a space that is not frequently used in indoor spaces such as shopping malls, supermarkets, offices, or homes. They consist of a casing and a heat exchanger inside the casing. Air enters the duct through the air inlet of the casing, is heated by the heat exchanger, and is then blown into the room through the air outlet of the casing to cool or heat the room. Typically, the cold air is exhausted from the ceiling, so the cold air diffuses quickly. Given these advantages, the application of ceiling-mounted air conditioner indoor units is becoming increasingly widespread.

[0003] Currently, mainstream ceiling-mounted air conditioners have thick casings to ensure efficient heat exchange, making them unsuitable for installation in typical residential buildings. Existing ceiling-mounted air conditioners use vertically or angled heat exchangers to ensure adequate heat exchange for users, facilitating the design of the drain pan below. However, this significantly increases the unit's thickness, resulting in a low cost-performance ratio. Therefore, designing an air conditioner with a thinner unit, smaller installation footprint, and higher heat exchange efficiency is essential. Summary of the Invention

[0004] In order to solve the technical problem of excessive thickness caused by the angle of the heat exchanger in the existing ceiling-mounted air conditioner, the present invention proposes an indoor unit and an air conditioner.

[0005] The technical solution adopted in this invention is:

[0006] The present invention proposes an indoor unit, comprising: a housing, a first heat exchanger horizontally disposed within the housing, a plurality of water collection trays spaced apart below the first heat exchanger, and a guide plate above each interval between two water collection trays for guiding condensate into the water collection trays, wherein a ventilation space is reserved between the water collection trays and the guide plate.

[0007] Furthermore, a return air vent is provided at the bottom of the housing, and at least one air outlet is provided at the bottom or side of the housing. The first heat exchanger is located above the return air vent, and a fan is provided above the first heat exchanger.

[0008] Furthermore, the housing is divided into a return air chamber in the middle and an air outlet guide chamber on both sides or around the perimeter. The bottom of the return air chamber is the return air inlet, and the first heat exchanger is installed inside. The bottom air inlet of the fan faces the return air chamber, and the air outlet sides around the fan are connected to the air outlet guide chamber. The bottom of the air outlet guide chamber is the air outlet.

[0009] Furthermore, a second heat exchanger is provided above the air outlet of the shell at an angle, and a second water receiving tray corresponding to the second heat exchanger is provided on the side wall of the shell.

[0010] Furthermore, the return air inlet is equipped with a return air filter.

[0011] Furthermore, the return air inlet is equipped with an adjustable-angle return air guide plate assembly.

[0012] Furthermore, the air outlet is equipped with an adjustable air guide plate.

[0013] Furthermore, the water receiving tray is U-shaped, and the liquid guiding plate is inverted V-shaped.

[0014] Furthermore, the indoor unit is provided with a first interface, a second interface, and a third interface. The first interface is connected to the first heat exchanger through a pipe, and a third throttle valve is provided on the pipe between the first interface and the first heat exchanger. The other side of the first heat exchanger is connected to the third interface through a pipe. The second interface is connected to the second heat exchanger through a pipe. The other side of the second heat exchanger is connected to the first interface through a pipe, and a second throttle valve is provided on the pipe on the other side of the second heat exchanger.

[0015] The present invention also proposes an air conditioner, including an outdoor unit and the aforementioned indoor unit.

[0016] Furthermore, the outdoor unit includes: a four-way valve A and a four-way valve B with four ports (D, E, S, and C), a compressor, an outdoor fan, and an outdoor heat exchanger; the compressor's intake pipe is connected to the S and C ports of the four-way valve A, and the E and S ports of the four-way valve B, and throttling elements are provided on the pipes of the C port of the four-way valve A and the E port of the four-way valve B; the compressor's exhaust pipe is connected to the D port of the four-way valve A, the D port of the four-way valve B, and the third port of each of the indoor units; the C port of the four-way valve B is connected to the outdoor heat exchanger through a pipe, the outdoor heat exchanger is connected to the first port of each of the indoor units through a pipe, and the E port of the four-way valve A is connected to the second port of the indoor unit through a pipe.

[0017] When the air conditioner is in cooling mode, ports D and C of the four-way valves A and B are connected, ports E and S are connected, and the second throttle valve is closed; when the air conditioner is in constant temperature dehumidification mode, ports D and C of the four-way valves A and B are connected, ports E and S are connected, and the second throttle valve is open.

[0018] When the air conditioner is in heating mode, the E port of the four-way valves A and B are connected to the S port, the D port is connected to the C port, and the second throttle valve is open.

[0019] Compared with existing technologies, this invention, by setting multiple spaced water collection trays and liquid guide plates at the return air inlet, allows the return air inlet heat exchanger (the first heat exchanger) to be placed horizontally, effectively reducing the shell thickness. Furthermore, a reheat heat exchanger is placed at the air outlet, which can be used to heat the dehumidified air. It can also participate in heat exchange in heating mode, increasing the unit's heat exchange area and improving heat exchange efficiency. Attached Figure Description

[0020] To more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of the indoor unit in an embodiment of the present invention;

[0022] Figure 2 This is a structural schematic diagram of the airflow direction of the indoor unit in an embodiment of the present invention;

[0023] Figure 3 This is a schematic diagram of the cooling mode in an embodiment of the present invention;

[0024] Figure 4 This is a schematic diagram of the heating mode in an embodiment of the present invention;

[0025] Figure 5 This is a schematic diagram of the constant temperature dehumidification mode in an embodiment of the present invention.

[0026] 11. Shell; 111. Water tray; 112. Liquid guide plate; 113. Second water tray; 12. First heat exchanger; 13. Motor; 14. Centrifugal fan blade; 15. Second heat exchanger; 16. Return air filter; 17. Return air guide plate assembly; 18. Outlet air guide plate; 19. Water pump;

[0027] 21. Compressor; 22. Gas-liquid separator; 23. Oil separator; 24. Outdoor heat exchanger; 25. Small valve; 26. Large valve; 27. High and low pressure gas pipe valves. Detailed Implementation

[0028] To make the technical problems to be solved, the technical solutions, and the beneficial effects of the present invention clearer, the present invention will be further described in detail below with reference to the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative of the present invention and are not intended to limit the present invention.

[0029] The principles and structure of the present invention will be described in detail below with reference to the accompanying drawings and embodiments.

[0030] Ceiling-mounted air conditioners offer advantages such as aesthetic appeal and minimal space requirements due to their concealed installation. Currently, most mainstream ceiling-mounted air conditioners use vertically or angled placement of the internal heat exchanger to ensure adequate heat exchange for users, facilitating the drip tray design. However, this vertical or angled placement results in a thicker casing (the larger the vertical dimension of the heat exchanger after installation, the thicker the unit), making it unsuitable for installation in typical residential buildings and resulting in low cost-effectiveness. This invention proposes a ceiling-mounted air conditioner indoor unit that allows for horizontal heat exchanger installation, reducing the thickness of the indoor unit, minimizing installation space requirements, and making it suitable for various locations.

[0031] like Figure 1 , 2 As shown, this invention proposes an indoor unit, comprising: a housing 11, a first heat exchanger 12, a water collection tray 111, and a liquid guide plate 112. Most of the components of the indoor unit are installed inside the housing 11. A return air vent is provided at the bottom of the housing 11, and air outlets are provided on the sides or around the bottom. The first heat exchanger 12 is disposed within the housing 11, specifically horizontally (i.e., laterally along its length and vertically along its thickness) and located above the return air vent. Multiple water collection trays 111 are disposed within the housing 11, located below the first heat exchanger 12, arranged in a horizontal row below the first heat exchanger 12 and spaced apart. The bottom surface of the first heat exchanger 12 is also provided with multiple liquid guide plates 112. The liquid guide plates 112 are positioned above the gap between the two water receiving trays 111, that is, the liquid guide plates 112 are also spaced apart and arranged in a horizontal row. A ventilation space is reserved between the water receiving trays 111 and the liquid guide plates 112. The condensate dripping from the bottom of the first heat exchanger 12 will be guided through the liquid guide plates 112 to the two water receiving trays 111 located below the liquid guide plates 112. The air flowing from the return air vent to the first heat exchanger 12 can first flow through the gap between the water receiving trays 111, then through the ventilation space reserved between the water receiving trays 111 and the liquid guide plates 112, and then 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. At the same time, the condensate dripping from the bottom of the first heat exchanger 12 can also be collected by multiple water receiving trays. This reduces the thickness space occupied by the heat exchanger within the shell, allowing the shell to be designed to be thinner compared to existing shells of vertically or inclined heat exchangers.

[0032] The drip tray 111 is specifically U-shaped, and the liquid guide plate 112 is inverted V-shaped. The U-shaped drip tray 111 ensures its capacity while preventing water from being easily carried out by the return air. The drip tray and liquid guide plate can also be configured in other shapes, as long as they can achieve water collection and guidance while preventing condensate from flowing directly out of the return air vent, they are all within the protection scope of this invention.

[0033] The housing also includes a water pump 19, which is connected to each water receiving tray 111 (specifically, through a pipe or a water receiving trough) and can extract water from each water receiving tray 111.

[0034] In one embodiment, a return air inlet is provided in the middle of the bottom surface of the housing 11, and air outlets are provided around the perimeter of the bottom surface of the housing 11. The housing 11 is divided into a return air chamber in the middle and an air outlet guiding chamber around the perimeter. The bottom of the return air chamber is the return air inlet, and a first heat exchanger 12 is provided inside. A water receiving tray 111 and a liquid guide plate 112 are provided between the first heat exchanger and the return air inlet. A fan is provided above the first heat exchanger, at the point where the return air chamber and the guiding chamber are connected. The fan motor 13 can be fixed to the top surface of the housing 11. The fan blades are centrifugal fan blades 14, which can draw in air from the bottom and vent air from the perimeter. The bottom of the guiding chamber extends to the bottom of the housing, that is, the bottom of the guiding chamber is the air outlet. When the fan is turned on, fresh air can be drawn in from the return air inlet, pass through the return air chamber, and then blown out from the air outlet through the guiding chamber.

[0035] The specific structure of the casing is as follows: A return air inlet is provided in the middle of the bottom plate of the casing 11, and a partition plate is provided along the edge of the return air inlet. The inner side of the partition plate forms a square or rectangular space, which is the return air chamber. The top of the partition plate is bent inward to form an outlet. A fan is installed above the outlet and between it and the top plate of the casing. The motor 13 of the fan can be fixed to the top plate of the casing. The centrifugal fan blades 14 of the fan cover the outlet formed by the partition plate. The space between the outer side of the partition plate and the inner side wall of the casing is a guide air duct. The guide air duct extends to the bottom of the casing, that is, air outlets are provided around the bottom plate of the casing, that is, the air outlets are arranged around the central return air inlet.

[0036] Meanwhile, in order to improve the airflow effect, the top plate and side plate of the shell are rounded (or the internal filling material can form rounded corners inside), so that when the fan blows air in all directions, the air can flow towards the air outlet at the bottom along the rounded corners.

[0037] In another embodiment, a return air inlet is provided in the middle of the bottom surface of the casing, and air outlets are provided on both sides of the bottom surface of the casing. The casing is divided into a return air chamber in the middle and air outlet guide chambers on both sides. The bottom of the return air chamber is the return air inlet, and a first heat exchanger is provided inside. A water-saving plate and a liquid guide plate are provided between the first heat exchanger and the return air inlet. A fan is provided above the first heat exchanger, at the connection between the return air chamber and the guide chamber. The fan blades are centrifugal fan blades, with air intake from the bottom and exhaust from all sides. The bottom of the guide chamber is the air outlet. When the fan is turned on, fresh air can be drawn in from the return air inlet, pass through the return air chamber, and then blown out from the air outlet through the guide chamber.

[0038] The specific structure of the casing is as follows: A return air inlet is located in the center of the bottom plate of the casing, and two partition plates are installed along the two side edges of the return air inlet. The inner side of the partition plates and the two inner walls of the front and rear sides of the casing form a square or rectangular space, which is the return air chamber. The top of the partition plates is bent inward to form an outlet. A fan is installed above this outlet and between it and the top plate of the casing. The fan can be fixed to the top plate of the casing, and the bottom surface of the fan covers the outlet formed by the partition plates. The space between the outer side of the partition plates and the inner side walls of the left and right sides of the casing is a guide air duct. Air outlets are located on both sides of the return air inlet on the bottom plate of the casing.

[0039] Meanwhile, in order to improve the airflow effect, the top plate of the shell and the side plates on the left and right sides are rounded (or the internal filling material can form rounded corners inside), so that when the fan blows air in all directions, the air can flow towards the air outlet at the bottom along the rounded corners.

[0040] Furthermore, the return air vent is equipped with a return air filter 16, which can filter out impurities in the air and prevent dust from entering the casing, causing dust and bacteria to accumulate and affect the user's health. The return air vent is also equipped with an adjustable return air guide plate assembly 17, which includes a row of horizontally arranged return air guide plates and corresponding drive components (return air plates and guide plates are commonly used in air conditioners, and their specific structural forms will not be described in detail). By setting up the return air guide plate assembly, the air inlet angle can be adjusted to prevent short circuits in the return air and thus prevent poor return airflow.

[0041] Furthermore, an air outlet is equipped with an air outlet guide plate 18 to adjust the air outlet direction. Simultaneously, a second heat exchanger 15 is installed within the vertical portion of the flow guide chamber. The second heat exchanger 15 is inclined, with its top abutting against the outer side of the partition plate and its bottom abutting against the inner wall of the shell. A second water collection tray 113 corresponding to the second heat exchanger 15 is provided on the inner wall of the shell. Because the second heat exchanger 15 is inclined, condensate flows along the inclined surface of the second heat exchanger 15 to the bottom surface of the second heat exchanger 15 against the inner wall of the shell, dripping into the second water collection tray 113. The second water collection tray 113 only needs to extend vertically out of the inner wall of the shell to collect the condensate from the second heat exchanger 15 without affecting the airflow in the flow guide chamber.

[0042] Preferably, the second heat exchanger can be a common copper-aluminum round tube hydrophilic finned heat exchanger, or a microchannel heat exchanger.

[0043] like Figures 3 to 5 As shown, the present invention also proposes an air conditioner, comprising: at least one indoor unit and one outdoor unit.

[0044] In a specific embodiment, two indoor air conditioning units are provided. The indoor air conditioning units are three-pipe indoor units. One indoor unit has one first heat exchanger and two second heat exchangers, and the other indoor unit has one first heat exchanger and one second heat exchanger.

[0045] The specific piping structure of the indoor unit is as follows: The indoor unit is a three-pipe indoor unit, that is, it has three interfaces, namely the first interface J1, the second interface J2 and the third interface J3. The first interface J1 is connected to the first heat exchanger 12 through a pipe, and a third throttle valve, namely electronic expansion valve EXV3, is installed on the pipe between the first interface J1 and the first heat exchanger 12. The other side of the first heat exchanger 12 is connected to the third interface J3 through a pipe. The second interface J2 is connected to the second heat exchanger 15 through a pipe. The other side of the second heat exchanger 15 is connected to the first interface J1 through a pipe, and a second throttle valve, namely electronic expansion valve EXV2, is installed on the pipe on the other side of the second heat exchanger 15.

[0046] The outdoor unit of the air conditioner is equipped with two four-way valves, namely four-way valve A and four-way valve B. Each four-way valve has four ports: D, E, S and C. It is also equipped with a compressor 21, a gas-liquid separator 22, an oil separator 23, an outdoor fan and an outdoor heat exchanger 24, as well as a large valve 26, a small valve 25 and a first throttle valve (i.e., electronic expansion valve EXV1).

[0047] The specific piping structure of the outdoor unit is as follows: the intake pipe of compressor 21 is connected to gas-liquid separator 22, and the exhaust pipe of compressor 21 is connected to oil separator 23; gas-liquid separator 22 is connected to the S and C ports of four-way valve A and the E and S ports of four-way valve B through pipes. In order to enable four-way valves A and B to switch normally, a throttling element is provided on the pipe of the C port of four-way valve A and the pipe of the E port of four-way valve B. This throttling element can be a throttle valve, etc.; oil separator 23 is connected to the D port of four-way valve A, the D port of four-way valve B, and each indoor unit through pipes. The third interface J3 of the indoor unit, and the pipe connecting the oil separator 23 to the third interface J3 of each indoor unit are equipped with high and low pressure gas pipe valves 27; the E port of the four-way valve A is connected to the large valve 26 through a pipe, and the large valve 26 is connected to the second interface J2 of each indoor unit through a pipe; the C port of the four-way valve B is connected to the outdoor heat exchanger 24 through a pipe, and the outdoor heat exchanger 24 is connected to the small valve 25 through a pipe, and the pipe connecting the outdoor heat exchanger 24 to the small valve 25 is equipped with a first throttle valve, namely the electronic expansion valve EXV1, and the small valve 25 is connected to the first interface J1 of each indoor unit through a pipe.

[0048] like Figure 3As shown, in cooling mode, four-way valve A is de-energized, with its ports D and C connected, and its ports S and E connected; four-way valve B is also de-energized, with its ports D and C connected, and its ports S and E connected. The electronic expansion valve EXV2 of the three-pipe indoor unit is closed. High-pressure gas passes through ports D and C of four-way valve B and condenses into subcooled liquid in the outdoor heat exchanger. This subcooled liquid then enters the second heat exchanger in the three-pipe indoor unit, evaporates, and returns to the compressor through ports E and S of four-way valve A, thus forming a loop. The heat in the air passing through the indoor unit is absorbed, achieving a cooling effect.

[0049] like Figure 4 As shown, in heating mode, ports D and E of the four-way valves A and B are connected, and ports S and C are connected. The high-temperature, high-pressure gas discharged from the compressor is divided into two parts: one part enters the first heat exchanger of the indoor unit through the large valve, and the other part enters the second heat exchanger through the high and low pressure gas pipe valves. When the unit is running, the indoor air is first heated by the ordinary heat exchanger and then further heated by the reheat heat exchanger at the air outlet, which can improve the heat exchange efficiency of the unit.

[0050] like Figure 5 As shown, in constant temperature dehumidification mode, four-way valve A is de-energized, with its D and C ports connected, and its S and E ports connected; four-way valve B is also de-energized, with its D and C ports connected, and its S and E ports connected. The high-pressure gas discharged from the compressor is divided into two parts. One part reaches the indoor unit through the high and low pressure gas pipe valves. However, in this mode, the electronic expansion valve EXV2 of the three-pipe indoor unit is open. Therefore, the high-pressure gas reaching the indoor unit through the high and low pressure gas pipe valves will condense in the second heat exchanger of the three-pipe indoor unit, thus heating the air and dehumidifying the entire indoor air without lowering the temperature. The other part of the high-pressure gas condenses into a subcooled liquid in the outdoor heat exchanger through the D and C ports of four-way valve B, then evaporates in the first heat exchanger of the three-pipe indoor unit and returns to the compressor through the E and S ports of four-way valve A, thus forming a loop. The heat in the air passing through the indoor unit is absorbed, achieving a cooling effect.

[0051] It should be noted that the terminology used above is for the purpose of describing particular embodiments only and is not intended to limit the exemplary embodiments according to this application. As used herein, the singular form is intended to include the plural form as well, unless the context clearly indicates otherwise. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0052] Unless otherwise specifically stated, the relative arrangement, numerical expressions, and values ​​of the components and steps described in these embodiments do not limit the scope of this application. It should also be understood that, for ease of description, the dimensions of the various parts shown in the drawings are not drawn to actual scale. Techniques, methods, and devices known to those skilled in the art may not be discussed in detail, but where appropriate, such techniques, methods, and devices should be considered part of the specification. In all examples shown and discussed herein, any specific values ​​should be interpreted as merely exemplary and not as limitations. Therefore, other examples of exemplary embodiments may have different values. It should be noted that similar reference numerals and letters in the following drawings denote similar items; therefore, once an item is defined in one drawing, it need not be further discussed in subsequent drawings.

[0053] In the description of this application, it should be understood that the orientation or positional relationship indicated by directional terms such as "front, back, up, down, left, right", "horizontal, vertical, horizontal" and "top, bottom" is usually based on the orientation or positional relationship shown in the accompanying drawings, and is only for the convenience of describing this application and simplifying the description. Unless otherwise stated, these directional terms do not indicate or imply that the device or element referred to must have a specific orientation or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation on the scope of protection of this application; the directional terms "inner" and "outer" refer to the inner and outer contours relative to the outline of each component itself.

[0054] For ease of description, spatial relative terms such as "above," "on top of," "on the upper surface of," "above," etc., are used herein to describe the spatial positional relationship of a device or feature as shown in the figures to other devices or features. It should be understood that spatial relative terms are intended to encompass different orientations in use or operation beyond the orientation of the device as described in the figures. For example, if the device in the figures were inverted, a device described as "above" or "on top of" other devices or structures would subsequently be positioned as "below" or "under" other devices or structures. Thus, the exemplary term "above" can include both "above" and "below." The device may also be positioned in other different ways (rotated 90 degrees or in other orientations), and the spatial relative descriptions used herein will be interpreted accordingly.

[0055] Furthermore, it should be noted that the use of terms such as "first" and "second" to define components is merely for the purpose of distinguishing the corresponding components. Unless otherwise stated, the above terms have no special meaning and therefore cannot be construed as limiting the scope of protection of this application.

[0056] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. An air conditioner, characterized in that, Includes outdoor and indoor units; The indoor unit includes: a housing, a first heat exchanger horizontally disposed within the housing, a plurality of water collection trays spaced apart below the first heat exchanger, a guide plate above the intervals of the water collection trays for guiding condensate into the water collection trays, and a ventilation space reserved between the water collection trays and the guide plate; a return air vent is provided at the bottom of the housing, and at least one air outlet is provided at the bottom or side of the housing. The casing has a second heat exchanger that is inclined near the air outlet; the indoor unit has a first interface, a second interface and a third interface. The first interface is connected to the first heat exchanger through a pipe, and a third throttle valve is provided on the pipe between the first interface and the first heat exchanger. The other side of the first heat exchanger is connected to the third interface through a pipe. The second interface is connected to the second heat exchanger through a pipe. The other side of the second heat exchanger is connected to the first interface through a pipe, and a second throttle valve is provided on the pipe on the other side of the second heat exchanger. The outdoor unit includes: a four-way valve A and a four-way valve B with four ports (D, E, S, and C), a compressor, and an outdoor heat exchanger; the compressor's intake pipe is connected to the S and C ports of the four-way valve A, and the E and S ports of the four-way valve B, and throttling elements are provided on the pipes of the C port of the four-way valve A and the E port of the four-way valve B; the compressor's exhaust pipe is connected to the D port of the four-way valve A, the D port of the four-way valve B, and the third port of each of the indoor units; the C port of the four-way valve B is connected to the outdoor heat exchanger through a pipe, the outdoor heat exchanger is connected to the first port of each of the indoor units through a pipe, and the E port of the four-way valve A is connected to the second port of the indoor unit through a pipe.

2. The air conditioner as described in claim 1, characterized in that, The first heat exchanger is located above the return air inlet, and a fan is installed above the first heat exchanger.

3. The air conditioner as described in claim 2, characterized in that, The housing is divided into a return air chamber in the middle and an air outlet chamber on the sides or around the perimeter. The bottom of the return air chamber is the return air inlet, and the first heat exchanger is installed inside. The bottom air inlet of the fan faces the return air chamber, and the air outlet sides around the fan are connected to the air outlet chamber. The bottom of the air outlet chamber is the air outlet.

4. The air conditioner as described in claim 1, characterized in that, The side wall of the shell is provided with a second water receiving tray corresponding to the second heat exchanger.

5. The air conditioner as described in claim 2, characterized in that, The return air inlet is equipped with a return air filter.

6. The air conditioner as described in claim 2, characterized in that, The return air inlet is equipped with an adjustable-angle return air guide plate assembly.

7. The air conditioner as described in claim 2, characterized in that, The air outlet is equipped with an adjustable air guide plate.

8. The air conditioner as described in claim 1, characterized in that, The water receiving tray is U-shaped, and the liquid guiding plate is inverted V-shaped.

9. The air conditioner as described in claim 1, characterized in that, When the air conditioner is in cooling mode, ports D and C of the four-way valves A and B are connected, ports E and S are connected, and the second throttle valve is closed; when the air conditioner is in constant temperature dehumidification mode, ports D and C of the four-way valves A and B are connected, ports E and S are connected, and the second throttle valve is open.

10. The air conditioner as described in claim 1, characterized in that, When the air conditioner is in heating mode, the E port of the four-way valves A and B are connected to the S port, the D port is connected to the C port, and the second throttle valve is open.

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