Indoor unit of air conditioner

Abstract

The utility model provides an air conditioner indoor unit which comprises a centrifugal fan. The indoor heat exchanger is located on the front side of the centrifugal fan; the indoor heat exchanger comprises a first-section heat exchanger; a second-section heat exchanger; the top end of the third-section heat exchanger is connected with the bottom end of the first-section heat exchanger; the bottom end is connected with the top end of the second-section heat exchanger; the included angle between the width direction of the first-section heat exchanger and the width direction of the third-section heat exchanger is a sixth included angle alpha 6, and alpha 6 is larger than or equal to 90 degrees and smaller than 180 degrees; the included angle between the width direction of the third section heat exchanger and the width direction of the second section heat exchanger is a seventh included angle alpha 7, and alpha 7 is larger than or equal to 90 degrees and smaller than 180 degrees. The heat exchanger area of the indoor heat exchanger can be increased, the height size of the main body can be reduced, the air conditioner indoor unit can be installed in a kitchen and other small spaces, the directions of air penetrating through the first-section heat exchanger, the second-section heat exchanger and the third-section heat exchanger are different, and the air flowing direction can be dispersed in advance before air flows out of an indoor air outlet; and direct wind blowing is avoided.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioners, in particular to an indoor unit of an air conditioner. Background Art

[0002] In small space scenarios such as kitchens, bathrooms, small bedrooms, storage rooms, convenience stores, etc., the indoor wall space is very limited. For example, there are range hoods, cabinets, windows, doors connecting to the living room, refrigerators placed, etc. around the walls of the kitchen, and there is a ceiling at the top of the wall. If an air conditioner is to be installed, this small space scenario will limit the size of the air conditioner as well as its air intake and outlet.

[0003] A conventional wall-mounted air conditioner indoor unit includes a casing. An air inlet and an air outlet are provided on the casing. An indoor heat exchanger is arranged inside the casing. The air inlet is arranged at the top of the casing, and the air outlet is arranged at the front lower part of the casing. When the air conditioner indoor unit works, air enters the casing from the indoor air inlet and then flows out from the indoor air outlet. This requires a certain height of air intake space to be left at the top of the casing. However, in the kitchen scenario, due to the presence of a ceiling at the top of the kitchen and insufficient height space in the kitchen, it is required that the wall-mounted air conditioner indoor unit can be installed close to the ceiling to save space. However, after the conventional wall-mounted unit is installed close to the ceiling, the air inlet of the wall-mounted air conditioner indoor unit will be blocked and air cannot enter.

[0004] In order to solve the problem that the air inlet cannot intake air due to being blocked, a bottom-air-intake and front-air-outlet type air conditioner indoor unit is provided, that is, the air inlet is arranged at the bottom and the air outlet is arranged at the front, and the indoor fan is a centrifugal fan. However, the bottom-air-intake and front-air-outlet type air conditioner indoor unit arranges the indoor heat exchanger as one section and the indoor heat exchanger is arranged vertically, which will result in a limited heat exchange area. In order to increase the heat exchange area, only the height of the indoor heat exchanger can be increased, which is not suitable for installation in small spaces such as kitchens, and is not suitable for installation in the space above doors and windows. Therefore, this application proposes an air conditioner indoor unit. Summary of the Invention

[0005] The utility model aims to solve at least one of the technical problems in the related art to a certain extent.

[0006] For this purpose, according to an embodiment of the present disclosure, an air conditioner indoor unit is proposed, including:

[0007] A main body, the direction from its bottom to its top is the height direction of the main body, and the main body at least includes a first cavity located inside the main body;

[0008] The main body includes:

[0009] A casing, an indoor air inlet is provided at its bottom, and an indoor air outlet is provided on the front side of the casing. The indoor air outlet and the indoor air inlet communicate with the first cavity;

[0010] A centrifugal fan, disposed in the first cavity;

[0011] An indoor heat exchanger, disposed in the first cavity; the indoor heat exchanger is located in front of the centrifugal fan and behind the indoor air outlet;

[0012] Define the plane perpendicular to the height direction of the main body as the second plane;

[0013] The indoor heat exchanger includes:

[0014] The first-stage heat exchanger, whose top end and bottom end are the two ends in the width direction of the first-stage heat exchanger; in the front-back direction of the main body, the bottom end of the first-stage heat exchanger is in front of the top end of the first-stage heat exchanger, and the width direction of the first-stage heat exchanger is arranged at an angle with the second plane;

[0015] The second-stage heat exchanger, whose top end and bottom end are the two ends in the width direction of the second-stage heat exchanger, and in the front-back direction of the main body, the top end of the second-stage heat exchanger is in front of the bottom end of the second-stage heat exchanger; the width direction of the second-stage heat exchanger is arranged at an angle with the second plane;

[0016] The third-stage heat exchanger, whose top end and bottom end are the two ends in the width direction of the third-stage heat exchanger, the top end of the third-stage heat exchanger is connected to the bottom end of the first-stage heat exchanger; the bottom end of the third-stage heat exchanger is connected to the top end of the second-stage heat exchanger;

[0017] The included angle between the width direction of the first-stage heat exchanger and the width direction of the third-stage heat exchanger is the sixth included angle α6, 90°≤α6<180°;

[0018] The included angle between the width direction of the third-stage heat exchanger and the width direction of the second-stage heat exchanger is the seventh included angle α7, 90°≤α7<180°.

[0019] The first-stage heat exchanger, the second-stage heat exchanger, and the third-stage heat exchanger are provided, and 90°≤α6<180° and 90°≤α7<180° are set. This can increase the heat exchanger area of the indoor heat exchanger while the main body height dimension is relatively determined, improving the heat exchange effect; on the premise of ensuring the heat exchanger area, the height dimension of the main body can be appropriately reduced, which can improve the installation and use range of the air conditioner indoor unit, enable the air conditioner indoor unit to be installed in small spaces such as kitchens, and can be installed in places with relatively small heights such as door bodies or windows. Moreover, it can make the opening of the indoor heat exchanger facing the centrifugal fan larger, facilitating the wind blown out from the volute air outlet to reach the indoor heat exchanger, and can make the directions of the wind passing through the first-stage heat exchanger, the second-stage heat exchanger, and the third-stage heat exchanger different. It can disperse the direction of the wind flow in advance before the air flows out of the indoor air outlet, and then converge at the indoor air outlet, which can improve the rapid diffusion of the air into the indoor air, avoid direct blowing of the wind, and improve the comfort of the air sent out from the indoor air outlet.

[0020] According to an embodiment of the present disclosure, the centrifugal fan includes:

[0021] A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside. The volute air duct is communicated with the volute air outlet; the volute air outlet is located at the front end of the volute air duct;

[0022] A centrifugal fan, which is arranged in the volute air duct;

[0023] A centrifugal motor, which is connected to the centrifugal fan and drives the centrifugal fan to rotate;

[0024] The distance between the top end and the bottom end of the volute air outlet is the second distance L2, and the minimum distance between the top end of the volute air outlet and the first-stage heat exchanger is the thirteenth distance L13. L13≥5mm, and L13 / L2≤1 / 3. This makes the distance between the top end of the volute air outlet and the first-stage heat exchanger not too small to avoid generating noise, and makes the distance between the top end of the volute air outlet and the first-stage heat exchanger not too large to avoid causing too small air volume and air outlet intensity of the indoor heat exchanger.

[0025] According to an embodiment of the present disclosure, the centrifugal fan includes:

[0026] A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside. The volute air duct is communicated with the volute air outlet; the volute air outlet is located at the front end of the volute air duct;

[0027] A centrifugal fan, which is arranged in the volute air duct;

[0028] A centrifugal motor, which is connected to the centrifugal fan and drives the centrifugal fan to rotate;

[0029] The distance between the top end and the bottom end of the volute air outlet is the second distance L2, and the minimum distance between the bottom end of the volute air outlet and the second-stage heat exchanger is the fourteenth distance L14, where L14 ≥ 5 mm and L14 / L2 ≤ 1 / 3. This ensures that the distance between the bottom end of the volute air outlet and the second-stage heat exchanger is not too small to avoid generating noise, and is not too large to avoid causing too small air volume and air outlet intensity of the indoor heat exchanger.

[0030] According to an embodiment of the present disclosure, the centrifugal fan includes:

[0031] A centrifugal volute, on which a volute air outlet is formed;

[0032] The first-stage heat exchanger includes a first heat exchanger windward surface on its side close to the centrifugal fan; in the height direction of the main body, the top end of the first heat exchanger windward surface is not lower than the top end of the volute air outlet.

[0033] According to an embodiment of the present disclosure, the centrifugal fan includes:

[0034] A centrifugal volute, on which a volute air outlet is formed;

[0035] The second-stage heat exchanger includes a second heat exchanger windward surface on its side close to the centrifugal fan; in the height direction of the main body, the bottom end of the second heat exchanger windward surface is not higher than the bottom end of the volute air outlet.

[0036] According to an embodiment of the present disclosure, the centrifugal fan includes:

[0037] A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside, and the volute air duct is communicated with the volute air outlet; the volute air outlet is located at the front end of the volute air duct;

[0038] The height of the volute air outlet in the height direction of the main body is the first height Gang, and the distance between the top end of the first heat exchanger windward surface and the top end of the volute air outlet in the height direction of the main body is the fifteenth distance L15, where 0 ≤ L15 / Gang ≤ 1 / 3. This avoids the situation that the first-stage heat exchanger is too high above the volute air outlet, resulting in low heat transfer efficiency at the top of the first-stage heat exchanger and affecting the heat transfer effect of the first-stage heat exchanger.

[0039] According to an embodiment of the present disclosure, the centrifugal fan includes:

[0040] A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside, and the volute air duct is communicated with the volute air outlet; the volute air outlet is located at the front end of the volute air duct;

[0041] The height of the volute air outlet in the height direction of the main body is the first height H4, and the distance between the bottom end of the windward surface of the second heat exchanger and the bottom end of the volute air outlet in the height direction of the main body is the sixteenth distance L16, where 0 ≤ L16 / H4 ≤ 1.5. This can prevent the heat exchange efficiency at the bottom of the second heat exchanger from being too low due to the second heat exchanger being too far below the volute air outlet, thus affecting the heat exchange effect of the second heat exchanger.

[0042] According to an embodiment of the present disclosure, the centrifugal fan includes:

[0043] A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside, and the volute air duct is communicated with the volute air outlet;

[0044] A centrifugal fan, disposed inside the volute air duct;

[0045] A centrifugal motor, connected to the centrifugal fan and driving the centrifugal fan to rotate;

[0046] The centrifugal volute includes a first side plate, a second side plate and a shroud, the first side plate and the second side plate are oppositely arranged and are respectively disposed on both sides of the axis of the centrifugal fan, and the shroud is disposed between the first side plate and the second side plate and surrounds the outside of the centrifugal fan;

[0047] The shroud, the first side plate and the second side plate are connected to enclose the volute air duct and the volute air outlet;

[0048] The shroud includes a volute tongue and a first air outlet plate, the first air outlet plate is located above the volute tongue and is spaced from the volute tongue, and the volute air outlet is formed at the front ends of the volute tongue and the first air outlet plate;

[0049] The minimum distance between the volute tongue and the first air outlet plate is the fifth distance L5, the first air outlet plate includes a first point A, and the minimum distance between the first point A and the volute tongue is the fifth distance, and the first point A is located between the front end and the rear end of the first air outlet plate;

[0050] When the centrifugal fan rotates, the diameter of the maximum contour formed by the rotation of the points on the centrifugal fan is the maximum diameter D1 of the centrifugal fan, and 1 / 3 ≤ L5 / D1 ≤ 1 / 2. This can prevent the minimum distance between the volute tongue and the first air outlet plate from being too large or too small relative to the maximum diameter of the centrifugal fan, and can ensure the air volume and air pressure of the centrifugal fan.

[0051] According to an embodiment of the present disclosure, the centrifugal fan includes:

[0052] A centrifugal volute, including a volute tongue;

[0053] A centrifugal fan, disposed inside the centrifugal volute;

[0054] A centrifugal motor is connected to the centrifugal fan and drives the centrifugal fan to rotate. The maximum contour formed by the rotation of points on the centrifugal fan is the outer contour of the centrifugal fan.

[0055] The minimum distance between the outer contour of the centrifugal fan and the volute tongue is the eighth spacing L8, where 4 mm ≤ L8 ≤ 10 mm. This avoids excessive noise caused by too small a distance between the volute tongue and the centrifugal fan, and also ensures that the distance between the volute tongue and the centrifugal fan is not too large, reducing air volume loss and ensuring the air volume of the outlet air.

[0056] According to an embodiment of the present disclosure, an indoor air conditioner is also proposed, including:

[0057] A main body, with the direction from its bottom to its top being the height direction of the main body. The main body at least includes a first cavity located inside the main body.

[0058] The main body includes:

[0059] A housing, having an indoor air inlet at its bottom and an indoor air outlet at the front side of the housing. The indoor air outlet and the indoor air inlet are communicated with the first cavity.

[0060] A centrifugal fan, disposed in the first cavity.

[0061] An indoor heat exchanger, disposed in the first cavity. The indoor heat exchanger is located in front of the centrifugal fan and behind the indoor air outlet.

[0062] A plane perpendicular to the height direction of the main body is defined as the second plane.

[0063] The indoor heat exchanger includes:

[0064] A first-section heat exchanger, with its top end and bottom end being the two ends in the width direction of the first-section heat exchanger. In the front-rear direction of the main body, the bottom end of the first-section heat exchanger is in front of the top end of the first-section heat exchanger, and the width direction of the first-section heat exchanger is arranged at an angle with the second plane.

[0065] A second-section heat exchanger, with its top end and bottom end being the two ends in the width direction of the second-section heat exchanger. In the front-rear direction of the main body, the top end of the second-section heat exchanger is in front of the bottom end of the second-section heat exchanger; the width direction of the second-section heat exchanger is arranged at an angle with the second plane.

[0066] A third-section heat exchanger, with its top end and bottom end being the two ends in the width direction of the third-section heat exchanger. The top end of the third-section heat exchanger is connected to the bottom end of the first-section heat exchanger; the bottom end of the third-section heat exchanger is connected to the top end of the second-section heat exchanger.

[0067] The included angle between the width direction of the first-stage heat exchanger and the width direction of the third-stage heat exchanger is the sixth included angle α6, where 90° ≤ α6 < 180°;

[0068] The included angle between the width direction of the third-stage heat exchanger and the width direction of the second-stage heat exchanger is the seventh included angle α7, where 90° ≤ α7 < 180°;

[0069] The included angle between the width direction of the third-stage heat exchanger and the second plane is the eighth included angle α8, where α8 ≥ 45°. This can improve the effect of draining condensate from the third-stage heat exchanger and avoid the influence of condensate on the performance degradation of the third-stage heat exchanger. Description of the Drawings

[0070] Figure 1 is a perspective view of an air conditioner indoor unit according to an embodiment of the present application;

[0071] Figure 2 is a perspective view of the air conditioner indoor unit from another perspective according to an embodiment of the present application;

[0072] Figure 3 is a partial structural view of the air conditioner indoor unit according to an embodiment of the present application;

[0073] Figure 4 is a sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0074] Figure 5 is another partial structural view of the air conditioner indoor unit according to an embodiment of the present application;

[0075] Figure 6 is another partial structural view of the air conditioner indoor unit according to an embodiment of the present application;

[0076] Figure 7 is another sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0077] Figure 8 is a sectional view of the internal heat exchanger according to an embodiment of the present application;

[0078] Figure 9 is another sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0079] Figure 10 is another sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0080] Figure 11 is another partial structural view of the air conditioner indoor unit according to an embodiment of the present application;

[0081] Figure 12 is another sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0082] Figure 13 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0083] Figure 14 is another partial structural diagram of the air conditioner indoor unit according to an embodiment of the present application;

[0084] Figure 15 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0085] Figure 16 is another partial structural diagram of the air conditioner indoor unit according to an embodiment of the present application;

[0086] Figure 17 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0087] Figure 18 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0088] Figure 19 is another partial structural diagram of the air conditioner indoor unit according to an embodiment of the present application;

[0089] Figure 20 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0090] Figure 21 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0091] Figure 22 is another partial structural diagram of the air conditioner indoor unit according to an embodiment of the present application;

[0092] Figure 23 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0093] Figure 24 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0094] Figure 25 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0095] Figure 26 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application;

[0096] Figure 27 is another cross-sectional view of the air conditioner indoor unit according to an embodiment of the present application.

[0097] In the above figures: the first chamber 101; the housing 1; the indoor air inlet 11; the indoor air outlet 12; the bottom plate 131; the first installation opening 1311; the air inlet grille 132; the front panel 133; the first air guide plate 134; the second air guide plate 135; the indoor heat exchanger 21; the first end of the heat exchanger 2111; the second end of the heat exchanger 2112; the leeward side of the heat exchanger 2113; the contour line of the leeward side 21131; the first sub - contour line of the leeward side 211311; the first sub - section heat exchanger 2114; the first sub - leeward side 21141; the first section heat exchanger 212; the first windward side of the heat exchanger 2121; the second section heat exchanger 213; the second windward side of the heat exchanger 2131; the third section heat exchanger 214; the centrifugal fan 22; the centrifugal volute 221; the volute air inlet 2211; the volute air outlet 2212; the volute air duct 2213; the first side plate 2214; the second side plate 2215; the shroud 2216; the volute tongue 22161; the first air outlet plate 22162; the inner contour line of the shroud 22163; the air outlet section of the volute tongue 221631; the air inlet section of the volute tongue 221632; the connecting section of the volute tongue 221633; the first contour line of the shroud 221634; the centrifugal fan blade 222; the outer contour of the centrifugal fan blade 2221; the centrifugal motor 223; the water receiving tray 23; the air outlet housing 34; the air outlet duct 341; the ceiling 903; the first opening of the ceiling 9031; the second opening of the ceiling 9032. Detailed implementation manners

[0098] To make the purpose and implementation manners of this application clearer, the following will clearly and completely describe the exemplary implementation manners of this application with reference to the drawings in the exemplary embodiments of this application. Obviously, the described exemplary embodiments are only a part of the embodiments of this application, rather than all of the embodiments.

[0099] It should be noted that the brief description of the terms in this application is only for the convenience of understanding the subsequent described implementation manners, rather than intending to limit the implementation manners of this application. Unless otherwise specified, these terms should be understood in their ordinary and common meanings.

[0100] The terms "first", "second", "third", etc. in the specification, claims and the above - mentioned drawings of this application are used to distinguish similar or like objects or entities, and do not necessarily mean to limit a specific order or sequence, unless otherwise noted. It should be understood that such terms can be interchanged under appropriate circumstances.

[0101] The terms "comprising" and "having" and any variations thereof are intended to cover but not exclusively include. For example, a product or device comprising a series of components does not necessarily have to be limited to all the clearly listed components, but may include other components not clearly listed or inherent to these products or devices.

[0102] This application proposes an air conditioner indoor unit, which will be described below with reference to the accompanying drawings.

[0103] In this application, the air conditioner may include an air conditioner indoor unit. The air conditioner may include an air conditioner outdoor unit. The air conditioner indoor unit may be installed indoors. The air conditioner outdoor unit may be installed outdoors. The air conditioner indoor unit and the air conditioner outdoor unit may form a split-type air conditioner.

[0104] The air conditioner indoor unit may be connected to the air conditioner outdoor unit.

[0105] In this application, the air conditioner indoor unit may be installed in a small space such as a kitchen. The air conditioner outdoor unit may be the corresponding air conditioner outdoor unit for the air conditioner indoor unit in the small space.

[0106] In this application, the air conditioner indoor unit may be a wall-mounted air conditioner indoor unit hung on the wall.

[0107] In this application, the air conditioner indoor unit may be hung on the cavity wall and installed close to the ceiling of the room.

[0108] In this application, the air conditioner indoor unit may include a main body.

[0109] The main body may have a top and a bottom. The direction from the bottom of the main body to the top of the main body may be the height direction of the main body.

[0110] The main body may have a length direction. The direction from one end of the main body to the other end of the main body may be the length direction of the main body.

[0111] The main body may have a front side and a rear side which are oppositely arranged. The side facing the user of the main body may be the front side of the main body. The direction from the front side of the main body to the rear side of the main body may be the front-rear direction of the main body.

[0112] The height direction, length direction and front-rear direction of the main body are perpendicular to each other.

[0113] In this application, the air conditioner indoor unit may be vertically arranged. The height direction of the air conditioner indoor unit is parallel to the vertical direction.

[0114] In this application, referring to Figures 1 - 4 , the main body may at least include a first cavity 101. The first cavity may be located inside the main body.

[0115] In this application, referring to Figures 1 - 4 , the main body may include a housing 1.

[0116] In this application, referring to Figures 1 - 4 , an indoor air inlet 11 may be formed on the housing. The indoor air inlet may be an entrance for air to enter the housing. The indoor air inlet may communicate with the first cavity.

[0117] In the present application, the indoor air inlet can be located at the bottom of the housing.

[0118] In the present application, referring to Figures 1 - 4 , an indoor air outlet 12 can be formed on the housing. The indoor air outlet can be for the air inside the housing to flow out of the housing. The indoor air outlet can communicate with the first chamber.

[0119] In the present application, the indoor air outlet can be located at the front side of the housing.

[0120] Setting the indoor air inlet at the bottom of the housing and the indoor air outlet at the front side of the housing can prevent the air intake and outlet of the indoor unit of the air conditioner from being affected when the indoor unit of the air conditioner is hung on the wall and installed close to the ceiling, can save indoor space, and enable a wider installation range of the indoor unit of the air conditioner.

[0121] In the present application, referring to Figures 1 - 4 , the main body can include an indoor heat exchanger 21. The indoor heat exchanger can be arranged in the first chamber. The indoor heat exchanger can be used for heat exchange with the air in the first chamber.

[0122] In the present application, the main body can include an indoor fan. The indoor fan can be arranged in the first chamber. The indoor fan can be used to provide power for the flow of air.

[0123] In the present application, referring to Figures 1 - 4 , the indoor fan can be a centrifugal fan 22.

[0124] In the present application, referring to Figures 5 - 6 , the centrifugal fan 22 can include a centrifugal volute 221. The centrifugal fan can include a centrifugal fan impeller 222. The centrifugal fan impeller can be arranged inside the centrifugal volute. The centrifugal fan can include a centrifugal motor 223. The centrifugal motor can be connected to the centrifugal fan impeller. The centrifugal motor can drive the centrifugal fan impeller to rotate.

[0125] In the present application, referring to Figures 5 - 6 , a volute air inlet 2211 can be formed on the centrifugal volute 221. A volute air outlet 2212 can be formed on the centrifugal volute. A volute air duct 2213 can be formed inside the centrifugal volute 221.

[0126] The volute air duct can communicate with the volute air inlet. The volute air duct can communicate with the volute air outlet.

[0127] In the present application, the volute air outlet can be located at the front end of the volute air duct.

[0128] In the present application, the volute air outlet can be located at the front end of the centrifugal volute.

[0129] In the present application, the volute air inlet can be arranged on both sides of the centrifugal volute in the longitudinal direction of the main body.

[0130] The centrifugal motor drives the centrifugal fan to rotate, so that air enters the volute air duct from both sides of the centrifugal volute through the volute air inlet, and then blows out from the volute air outlet.

[0131] Setting the indoor fan as a centrifugal fan can make the static pressure capacity of the air conditioner indoor unit strong, the wind resistance capacity strong, and the air supply distance far.

[0132] In this application, the indoor heat exchanger can be located on the front side of the centrifugal fan. The indoor heat exchanger can be located on the rear side of the indoor air outlet.

[0133] In this application, the volute air outlet can face the indoor heat exchanger.

[0134] In this application, the plane perpendicular to the length direction of the main body is defined as the first plane.

[0135] In this application, the indoor heat exchanger can be one section. The indoor heat exchanger can have a width direction.

[0136] In this application, the width direction of the indoor heat exchanger is parallel to the first plane or lies within the first plane.

[0137] Reference Figure 7 , the indoor heat exchanger can include a heat exchanger first end 2111 and a heat exchanger second end 2112 which are oppositely arranged in its width direction.

[0138] In the height direction of the main body, the heat exchanger second end can be located on the side of the heat exchanger first end close to the bottom of the main body.

[0139] Along the width direction of the indoor heat exchanger, the indoor heat exchanger is arc-shaped or zigzag-shaped, and the indoor heat exchanger bulges towards the side close to the indoor air outlet.

[0140] Defining the indoor heat exchanger as arc-shaped or zigzag-shaped in the width direction of the indoor heat exchanger can increase the heat exchanger area of the indoor heat exchanger under the condition that the height dimension of the main body is relatively determined, improve the heat exchange effect; on the premise of ensuring the heat exchanger area, the height dimension of the main body can be appropriately reduced, the installation and use range of the air conditioner indoor unit can be improved, the air conditioner indoor unit can be installed in small spaces such as kitchens, and can be installed in places with relatively small heights such as door bodies or windows.

[0141] In this application, the plane perpendicular to the height direction of the main body is defined as the second plane.

[0142] In this application, reference Figures 7 - 9 , the indoor heat exchanger includes a heat exchanger leeward surface 2113 on the side away from the centrifugal fan.

[0143] The leeward side of the heat exchanger includes a leeward side contour line 21131 extending along the width direction of the indoor heat exchanger. The arc length of the leeward side contour line is a first length W1.

[0144] The leeward side contour line includes a first sub-leeward side contour line 211311. The included angle between the tangent of the first sub-leeward side contour line and the second plane is a first included angle α1.

[0145] In this application, α1 ≥ a first parameter value. The first parameter value can be any value between 40° and 50°. The first parameter value can be 45°. α1 ≥ 45°. This makes the first sub-leeward side contour line sufficiently inclined so that the condensed water on the part of the first sub-leeward side contour line corresponding to the indoor heat exchanger can flow down quickly, avoiding the attenuation effect of the condensed water on the performance of the indoor heat exchanger; it can reduce the distance of the indoor heat exchanger in the front-back direction of the main body, reduce the size in the front-back direction of the main body, increase the installation range of the air conditioner indoor unit, and enable the air conditioner indoor unit to be installed in small spaces such as kitchens.

[0146] In this application, referring to Figures 7 - 9 , the midpoint of the leeward side contour line is located on the first sub-leeward side contour line.

[0147] The arc length of the contour line between the vertex of the first sub-leeward side contour line and the midpoint of the leeward side contour line is a second length W2. The arc length of the contour line between the lowest point of the first sub-leeward side contour line and the midpoint of the leeward side contour line is a third length W3.

[0148] In this application, W2 / W1 ≥ a second parameter value. The second parameter value can be any value between 1 / 5 and 3 / 10. The second parameter value can be 1 / 4. W2 / W1 ≥ 1 / 4. This makes the area where the indoor heat exchanger is sufficiently inclined larger, and can guarantee the performance of a larger area of the indoor heat exchanger.

[0149] In this application, W2 / W1 ≤ a third parameter value. The third parameter value can be any value between 7 / 20 and 3 / 5. The third parameter value can be 2 / 5. W2 / W1 ≤ 2 / 5. Avoiding the area where the indoor heat exchanger is sufficiently inclined from being too large, minimizing the size of the main body in the height direction, and increasing the installation and use range of the air conditioner indoor unit.

[0150] In this application, W3 / W1 ≥ a fourth parameter value. The fourth parameter value can be any value between 1 / 5 and 3 / 10. The fourth parameter value can be 1 / 4. W3 / W1 ≥ 1 / 4. This makes the area where the indoor heat exchanger is sufficiently inclined larger, and can guarantee the performance of a larger area of the indoor heat exchanger.

[0151] In this application, W3 / W1 ≤ the thirty-fourth parameter value. The thirty-fourth parameter value can be any value between 7 / 20 and 3 / 5. The thirty-fourth parameter value can be 2 / 5. W3 / W1 ≤ 2 / 5. Avoiding an overly large area where the indoor heat exchanger is sufficiently inclined, minimizing the dimension of the main body in the height direction, and expanding the installation and usage range of the air conditioner indoor unit.

[0152] In this application, referring to Figures 7 - 9 , the indoor heat exchanger includes a first sub-section heat exchanger 2114. The first sub-section heat exchanger includes a first sub-leeward surface 21141 on the side away from the centrifugal fan.

[0153] In this application, the first sub-leeward surface includes a first sub-leeward surface contour line 211311 extending in the width direction of the indoor heat exchanger.

[0154] In this application, the angle between the tangent of the first sub-leeward surface contour line and the second plane is the first angle α1.

[0155] In this application, α1 ≥ the first parameter value. The first parameter value can be any value between 40° and 50°. The first parameter value can be 45°. α1 ≥ 45°. Making the first sub-section heat exchanger sufficiently inclined so that the condensed water on the first sub-section heat exchanger can flow down quickly, avoiding the attenuation effect of the condensed water on the performance of the indoor heat exchanger; reducing the distance of the indoor heat exchanger in the front-back direction of the main body, minimizing the dimension of the main body in the front-back direction, expanding the installation range of the air conditioner indoor unit, and enabling the air conditioner indoor unit to be installed in small spaces such as kitchens.

[0156] In this application, in the height direction of the main body, the center of the indoor heat exchanger is located between the top and bottom of the first sub-section heat exchanger.

[0157] In the height direction of the main body, the top of the first sub-section heat exchanger is not lower than the top of the volute air outlet.

[0158] In the height direction of the main body, the bottom of the first sub-section heat exchanger is not higher than the bottom of the volute air outlet.

[0159] In this application, referring to Figure 10 , when the centrifugal fan rotates, the diameter of the maximum contour formed by the points on the centrifugal fan is the maximum diameter D1 of the centrifugal fan. In the height direction of the main body, the height difference between the rotation axis of the centrifugal fan and the center of the indoor heat exchanger is the first distance L1.

[0160] In this application, L1 / D1 ≤ the fifth parameter value. The fifth parameter value can be any value between 1 / 3 and 1 / 2. The fifth parameter value can be 1 / 2. L1 / D1 ≤ 1 / 2. This can make the distance between the rotation axis of the centrifugal fan and the center of the indoor heat exchanger in the main body height direction smaller, enabling the centrifugal fan and the indoor heat exchanger to be arranged as directly opposite as possible, making the air passing through the indoor heat exchanger more uniform, improving the heat exchange effect of the indoor heat exchanger, and reducing the condensation problem caused by local overcooling or overheating of the indoor heat exchanger.

[0161] In this application, referring to Figures 11 - 13 , the indoor heat exchanger may include a first-section heat exchanger 212. The first-section heat exchanger has a width direction. The top end and the bottom end of the first-section heat exchanger are the two ends in the width direction of the first-section heat exchanger.

[0162] In this application, the width direction of the first-section heat exchanger is parallel to or lies within the first plane.

[0163] In this application, referring to Figures 11 - 13 , the indoor heat exchanger may include a second-section heat exchanger 213. The second-section heat exchanger may have a width direction. The top end and the bottom end of the second-section heat exchanger may be the two ends in the width direction of the second-section heat exchanger.

[0164] In this application, the width direction of the second-section heat exchanger is parallel to or lies within the first plane.

[0165] In this application, in the front-back direction of the main body, the top end of the second-section heat exchanger is in front of the bottom end of the second-section heat exchanger. The top end of the second-section heat exchanger is connected to the bottom end of the first-section heat exchanger.

[0166] In this application, referring to Figures 11 - 13 , the included angle between the width direction of the first-section heat exchanger and the second plane may be the second included angle α2.

[0167] In this application, the second included angle α2 ≥ the sixth parameter value. The sixth parameter value can be any value between 45° and 70°. The sixth parameter value can be 45°. α2 ≥ 45°. This makes the inclination of the first-section heat exchanger large enough so that the condensed water on the first-section heat exchanger can flow down quickly, avoiding the attenuation of the performance of the first-section heat exchanger caused by the condensed water.

[0168] In this application, the included angle between the width direction of the second-section heat exchanger and the second plane is the third included angle α3.

[0169] In this application, the third included angle α3 ≥ the seventh parameter value. The seventh parameter value can be any value between 45° and 50°. The seventh parameter value can be 45°. α3 ≥ 45°. This makes the inclination of the second heat exchanger large enough so that the condensed water on the second heat exchanger can flow down quickly, avoiding the attenuation of the performance of the second heat exchanger caused by the condensed water.

[0170] In this application, the second included angle α2 ≥ 45° and the third included angle α3 ≥ 45°, making the inclination of the first heat exchanger large enough so that the condensed water on the first heat exchanger can flow down quickly, avoiding the attenuation of the performance of the first heat exchanger caused by the condensed water, and making the inclination of the second heat exchanger large enough so that the condensed water on the second heat exchanger can flow down quickly, avoiding the attenuation of the performance of the second heat exchanger caused by the condensed water; and it can increase the heat exchange area of the indoor heat exchanger when the main body height range is certain, improve the heat exchange effect, and can reduce the height dimension of the main body when the heat exchange area is certain, can improve the applicability of the air conditioner indoor unit, can be installed in small spaces such as kitchens, and can be installed in the space at the top of a door or window.

[0171] In this application, referring to Figures 11 - 13 , the included angle between the width direction of the first heat exchanger and the width direction of the second heat exchanger is the fourth included angle α4. The opening direction of the fourth included angle faces the centrifugal fan.

[0172] In this application, α4 < the eighth parameter value. The eighth parameter value can be any value between 150° and 180°. The eighth parameter value can be 180°. α4 < 180°. This can avoid the top of the second heat exchanger being too close to the indoor air outlet due to the fourth included angle being too large, can reduce the space occupied by the indoor heat exchanger in the front-back direction of the main body, can reduce the front-back dimension of the main body, improve the applicability of the air conditioner indoor unit, and can be installed in small spaces such as kitchens.

[0173] Setting the indoor heat exchanger to include a first heat exchanger and a second heat exchanger, with α2 ≥ 45°, α3 ≥ 45°, and α4 < 180°, can increase the heat exchanger area of the indoor heat exchanger when the main body height dimension is relatively determined, improve the heat exchange effect; can appropriately reduce the height dimension of the main body on the premise of ensuring the heat exchanger area, can improve the installation and use range of the air conditioner indoor unit, can enable the air conditioner indoor unit to be installed in small spaces such as kitchens, and can be installed in places with a relatively small height such as door bodies or windows; making the inclination of the first heat exchanger and the second heat exchanger large enough so that the condensed water on the indoor heat exchanger can flow down quickly, avoiding the attenuation of the performance of the indoor heat exchanger caused by the condensed water.

[0174] In this application, referring to Figures 11 - 13, the distance between the top end and the bottom end of the volute air outlet is the second distance L2. The minimum distance between the top end of the volute air outlet and the first-stage heat exchanger is the third distance L3. The minimum distance between the bottom end of the volute air outlet and the second-stage heat exchanger is the fourth distance L4.

[0175] In this application, L4 ≥ the ninth parameter value. The ninth parameter value can be any value between 4 mm and 6 mm. The ninth parameter value can be 5 mm. L4 ≥ 5 mm. This can avoid excessive noise caused by the too-close distance between the second-stage heat exchanger and the bottom end of the volute air outlet.

[0176] In this application, L4 / L2 ≤ the tenth parameter value. The tenth parameter value can be any value between 1 / 3 and 2 / 3. The tenth parameter value can be 1 / 2. L4 / L2 ≤ 1 / 2. This can avoid the excessive distance between the second-stage heat exchanger and the volute air outlet from affecting the air outlet volume, and can also avoid the too-small distance between the top and bottom ends of the volute air outlet from affecting the air outlet volume.

[0177] In this application, L3 ≤ L2, which can avoid the excessive distance between the first-stage heat exchanger and the volute air outlet from affecting the air outlet volume.

[0178] In this application, L4 ≥ 5 mm, L4 / L2 ≤ 1 / 2, L3 ≤ L2, which can make the air outlet volume appropriate and avoid excessive noise caused by the too-close distance between the indoor heat exchanger and the volute air outlet.

[0179] In this application, refer to Figures 14 - 15 , the centrifugal volute 221 includes a first side plate 2214. The centrifugal volute 221 may include a second side plate 2215. The first side plate and the second side plate may be oppositely arranged. The first side plate and the second side plate may be located on both sides of the axis of the centrifugal fan.

[0180] In this application, the centrifugal fan may include an enclosing plate 2216. The enclosing plate may be disposed between the first side plate and the second side plate. The enclosing plate may surround the outside of the centrifugal fan.

[0181] The enclosing plate, the first side plate and the second side plate are connected to form a volute air duct and a volute air outlet.

[0182] In this application, refer to Figures 14 - 15 , the enclosing plate may include a volute tongue 22161. The volute air outlet may be formed at the front end of the volute tongue.

[0183] In this application, the enclosing plate may include a first air outlet plate 22162. The first air outlet plate may be spaced apart from the volute tongue.

[0184] The first air outlet plate may be located above the volute tongue. The volute air outlet may be formed at the front end of the first air outlet plate.

[0185] In this application, refer toFigures 14 - 15 The minimum distance between the volute tongue and the first air outlet plate may be the fifth distance L5.

[0186] In the present application, the first air outlet plate may include a first point A1. The minimum distance between the first point A1 and the volute tongue is the fifth distance L5.

[0187] The first point A may be located between the front end and the rear end of the first air outlet plate.

[0188] In the present application, referring to Figures 14 - 15 when the centrifugal fan rotates, the diameter of the maximum contour formed by the rotation of the points on the centrifugal fan is the maximum diameter D1 of the centrifugal fan.

[0189] In the present application, L5 / D1 ≥ the eleventh parameter value. The eleventh parameter value may be any value between 1 / 4 and 3 / 8. The eleventh parameter value may be 1 / 3. L5 / D1 ≥ 1 / 3. It can ensure that the minimum distance between the volute tongue and the first air outlet plate is not too small relative to the maximum diameter of the centrifugal fan, and can guarantee the air volume output of the centrifugal fan.

[0190] In the present application, L5 / D1 ≤ the twelfth parameter value. The twelfth parameter value may be any value between 5 / 12 and 2 / 3. The twelfth parameter value may be 1 / 2. L5 / D1 ≤ 1 / 2. It can ensure that the minimum distance between the volute tongue and the first air outlet plate is not too large relative to the maximum diameter of the centrifugal fan, and can guarantee the air outlet pressure of the centrifugal fan.

[0191] In the present application, 1 / 3 ≤ L5 / D1 ≤ 1 / 2, which can avoid the minimum distance between the volute tongue and the first air outlet plate being too large or too small relative to the maximum diameter of the centrifugal fan, and can guarantee the air volume output and air outlet pressure of the centrifugal fan.

[0192] In the present application, referring to Figures 14 - 15 the centrifugal volute includes a volute tongue. The centrifugal fan is arranged in the centrifugal volute. The centrifugal motor is connected to the centrifugal fan. The centrifugal motor drives the centrifugal fan to rotate. The maximum contour formed by the rotation of the points on the centrifugal fan is the outer contour of the centrifugal fan. The minimum distance between the outer contour of the centrifugal fan and the volute tongue is the eighth spacing L8.

[0193] In the present application, L8 ≥ the twenty-seventh parameter value. The twenty-seventh parameter value may be any value between 3 mm and 5 mm. The twenty-seventh parameter value may be 4 mm. To avoid excessive noise caused by too small a distance between the volute tongue and the centrifugal fan.

[0194] In the present application, L8 ≤ the twenty-eighth parameter value. The twenty-eighth parameter value may be any value between 8 mm and 12 mm. The twenty-eighth parameter value may be 10 mm. So that the distance between the volute tongue and the centrifugal fan is not too large, which can reduce the air volume loss and guarantee the air volume output.

[0195] In the present application, 4 mm ≤ L8 ≤ 10 mm, which can avoid generating noise due to too small distance between the volute tongue and the centrifugal fan, and prevent the distance between the volute tongue and the centrifugal fan from being too large, so as to reduce the air volume loss and ensure the air volume of the air outlet.

[0196] In the present application, referring to Figures 16 - 18 , the indoor heat exchanger may include a first-stage heat exchanger 212. The first-stage heat exchanger has a width direction. The top end and the bottom end of the first-stage heat exchanger are the two ends in the width direction of the first-stage heat exchanger.

[0197] In the front-rear direction of the main body, the bottom end of the first-stage heat exchanger is located in front of the top end of the first-stage heat exchanger.

[0198] In the present application, the width direction of the first-stage heat exchanger is parallel to or lies in the first plane.

[0199] In the present application, referring to Figures 16 - 18 , the indoor heat exchanger may include a second-stage heat exchanger 213. The second-stage heat exchanger may have a width direction. The top end and the bottom end of the second-stage heat exchanger may be the two ends in the width direction of the second-stage heat exchanger.

[0200] In the present application, the width direction of the second-stage heat exchanger is parallel to or lies in the first plane.

[0201] In the front-rear direction of the main body, the top end of the second-stage heat exchanger is located in front of the bottom end of the second-stage heat exchanger. The top end of the second-stage heat exchanger is connected to the bottom end of the first-stage heat exchanger.

[0202] In the present application, referring to Figures 16 - 18 , the included angle between the width direction of the first-stage heat exchanger and the width direction of the second-stage heat exchanger is the fourth included angle α4.

[0203] In the present application, α4 < the fourteenth parameter value. The fourteenth parameter value may be any value between 80° and 90°. The fourteenth parameter value may be 90°. α4 < 90°. It can increase the heat exchange area of the indoor heat exchanger while avoiding a large height of the main body, can increase the installation range of the air conditioner indoor unit, can be installed in small spaces such as kitchens, and can be installed in the space above a window or a door.

[0204] In the present application, a volute air inlet may be formed on the centrifugal volute. The volute air inlet may be located on both sides of the centrifugal volute in the length direction of the main body.

[0205] Referring to Figures 16 - 18 , the minimum distance between the first-stage heat exchanger and the volute air inlet may be the sixth distance L6.

[0206] In this application, L6 ≥ the fifteenth parameter value. The fifteenth parameter value can be any value in the range of 6 mm to 10 mm. The fifteenth parameter value can be 8 mm. L6 ≥ 8 mm. This is to avoid abnormal noise caused by a relatively short distance between the first-stage heat exchanger and the volute air inlet.

[0207] In this application, L6 ≤ the sixteenth parameter value. The sixteenth parameter value can be any value in the range of 28 mm to 32 mm. The sixteenth parameter value can be 30 mm. L6 ≤ 30 mm. This is to avoid a relatively large distance between the first-stage heat exchanger and the volute air inlet, which may result in a relatively large overall front-back dimension of the main body and affect the installation and applicable range of the indoor heat exchanger.

[0208] In this application, 8 mm ≤ L6 ≤ 30 mm. This can avoid abnormal noise caused by a relatively short distance between the first-stage heat exchanger and the volute air inlet, and also avoid a relatively large distance between the first-stage heat exchanger and the volute air inlet, which may result in a relatively large overall front-back dimension of the main body and affect the installation and applicable range of the indoor heat exchanger.

[0209] In this application, refer to Figures 16 - 18 , the minimum distance between the second-stage heat exchanger and the volute air inlet can be the seventh distance L7.

[0210] In this application, L7 ≥ the seventeenth parameter value. The seventeenth parameter value can be any value in the range of 6 mm to 10 mm. The seventeenth parameter value can be 8 mm. L6 ≥ 8 mm. This is to avoid abnormal noise caused by a relatively short distance between the second-stage heat exchanger and the volute air inlet.

[0211] In this application, L7 ≤ the eighteenth parameter value. The eighteenth parameter value can be any value in the range of 28 mm to 32 mm. The eighteenth parameter value can be 30 mm. L7 ≤ 30 mm. This is to avoid a relatively large distance between the second-stage heat exchanger and the volute air inlet, which may result in a relatively large overall front-back dimension of the main body and affect the installation and applicable range of the indoor heat exchanger.

[0212] In this application, 8 mm ≤ L7 ≤ 30 mm. This can avoid abnormal noise caused by a relatively short distance between the second-stage heat exchanger and the volute air inlet, and also avoid a relatively large distance between the second-stage heat exchanger and the volute air inlet, which may result in a relatively large overall front-back dimension of the main body and affect the installation and applicable range of the indoor heat exchanger.

[0213] The first-stage heat exchanger and the second-stage heat exchanger are provided, which can increase the heat exchanger area of the indoor heat exchanger under the condition that the main body height dimension is relatively determined, improve the heat exchange effect; can appropriately reduce the height dimension of the main body on the premise of ensuring the heat exchanger area, can improve the installation and use range of the air conditioner indoor unit, can enable the air conditioner indoor unit to be installed in small spaces such as kitchens, and can be installed in places with a relatively small height such as door bodies or windows; setting 8mm≤L6≤30mm and 8mm≤L7≤30mm can avoid abnormal noise caused by the relatively short distance between the first-stage heat exchanger and the second-stage heat exchanger and the volute air inlet, and avoid the relatively large front-back dimension of the main body caused by the relatively large distance between the first-stage heat exchanger and the second-stage heat exchanger and the volute air inlet, which affects the installation and application range of the indoor heat exchanger.

[0214] In the present application, referring to Figures 16 - 18 , a volute air outlet can be formed on the centrifugal volute. A volute air duct can be formed inside the centrifugal volute. The volute air duct communicates with the volute air inlet and the volute air outlet. The volute air outlet is located at the front end of the volute air duct.

[0215] The first-stage heat exchanger has a first-stage heat exchanger windward surface 2121 on its side close to the centrifugal fan.

[0216] The second-stage heat exchanger has a second-stage heat exchanger windward surface 2131 on its side close to the centrifugal fan.

[0217] Referring to Figures 16 - 18 , the distance between the top of the first-stage heat exchanger windward surface and the top of the volute air outlet in the main body height direction is the ninth distance L9.

[0218] In the present application, L9≥0mm, so that in the height direction of the main body, the top of the first-stage heat exchanger windward surface can be flush with the top of the volute air outlet, or the top of the first-stage heat exchanger windward surface is located above the top of the volute air outlet, or the top of the first-stage heat exchanger windward surface can be located below the top of the volute air outlet.

[0219] In the present application, L9≤the nineteenth parameter value. The nineteenth parameter value can be any value between 40 - 50mm. The nineteenth parameter value can be 50mm. L9≤50mm. Avoid that the top of the first-stage heat exchanger windward surface is too high above the top of the volute air outlet, resulting in low heat exchange efficiency in a relatively large area at the top of the first-stage heat exchanger, avoid uneven heat exchange of the first-stage heat exchanger causing condensation problems, and avoid that the top of the first-stage heat exchanger windward surface is too low below the top of the volute air outlet, making it difficult for the air blown out from the top of the volute air outlet to reach the indoor heat exchanger.

[0220] In this application, 0 mm ≤ L9 ≤ 50 mm. This can prevent the top of the windward surface of the first-stage heat exchanger from being too much higher than the top of the volute air outlet, which may lead to low heat transfer efficiency in many areas at the top of the first-stage heat exchanger, avoid uneven heat transfer of the first-stage heat exchanger causing condensation problems, and prevent the top of the volute air outlet from having difficulty blowing air onto the indoor heat exchanger due to the top of the windward surface of the first-stage heat exchanger being too much lower than the top of the volute air outlet.

[0221] In this application, referring to Figures 16 - 18 , the bottom end of the windward surface of the second-stage heat exchanger is not higher than the bottom end of the volute air outlet. The distance between the bottom end of the windward surface of the second-stage heat exchanger and the bottom end of the volute air outlet in the height direction of the main body is the tenth distance L10.

[0222] In this application, L10 ≥ 0 mm, which can ensure that the bottom end of the windward surface of the second-stage heat exchanger is not higher than the bottom end of the volute air outlet, and prevent the air blown from the bottom of the volute air outlet from not being able to reach the indoor heat exchanger.

[0223] In this application, L10 ≤ the twentieth parameter value. The twentieth parameter value can be any value between 40 - 50 mm. The twentieth parameter value can be 50 mm. L10 ≤ 50 mm. This can prevent the bottom of the second-stage heat exchanger from having low heat transfer efficiency in many areas due to the bottom end of the windward surface of the second-stage heat exchanger being too much lower than the bottom end of the volute air outlet, and avoid uneven heat transfer of the second-stage heat exchanger causing condensation problems.

[0224] In this application, 0 mm ≤ L10 ≤ 50 mm, which can prevent the air blown from the bottom of the volute air outlet from not being able to reach the indoor heat exchanger, and prevent the bottom of the second-stage heat exchanger from having low heat transfer efficiency in many areas due to the bottom end of the windward surface of the second-stage heat exchanger being too much lower than the bottom end of the volute air outlet, and avoid uneven heat transfer of the second-stage heat exchanger causing condensation problems.

[0225] In this application, referring to Figures 16 - 18 , the included angle between the width direction of the first-stage heat exchanger and the second plane is the second included angle α2.

[0226] In this application, α2 < the twenty-first parameter value. The twenty-first parameter value can be any value between 30° - 45°. The twenty-first parameter value can be 45°. α2 < 45°. This can increase the heat transfer area of the indoor heat exchanger while reducing the height dimension of the main body, and can be installed in small spaces such as kitchens, and can be installed above doors or windows.

[0227] In this application, the included angle between the width direction of the second-stage heat exchanger and the second plane is the third included angle α3.

[0228] In this application, α3 < the value of the twenty-second parameter. The value of the twenty-second parameter can be any value within 30° - 45°. The value of the twenty-second parameter can be 45°. α3 < 45°. It can increase the heat exchange area of the indoor heat exchanger while reducing the height dimension of the main body, and can be installed in small spaces such as kitchens, and can be installed above doors or windows.

[0229] In this application, α3 < 45° and α2 < 45°. It can increase the heat exchange area of the indoor heat exchanger while reducing the height dimension of the main body, and can be installed in small spaces such as kitchens, and can be installed above doors or windows.

[0230] In this application, α2 ≥ the value of the twenty-third parameter. The value of the twenty-third parameter can be any value between 15° - 25°. The value of the twenty-third parameter can be 20°. α2 ≥ 20°. It can prevent the inclination angle of the first-stage heat exchanger from being too small, resulting in less air passing through the first-stage heat exchanger, ensure the heat exchange effect of the first-stage heat exchanger, and prevent the condensate water on the first-stage heat exchanger from being difficult to flow down, improving the flow effect of the condensate water.

[0231] In this application, α2 ≤ the value of the twenty-fourth parameter. The value of the twenty-fourth parameter can be any value between 50° - 70°. The value of the twenty-fourth parameter can be 60°. α2 ≤ 60°. It can prevent the inclination angle of the first-stage heat exchanger from being too large and prevent the dimension in the height direction of the main body from being too large.

[0232] In this application, 20° ≤ α2 ≤ 60°, which is convenient for the condensate water on the first-stage heat exchanger to flow down, and while ensuring the heat exchange area of the first-stage heat exchanger, it prevents the dimension in the height direction of the main body from increasing due to the setting of the first-stage heat exchanger.

[0233] In this application, α3 ≥ the value of the twenty-fifth parameter. The value of the twenty-fifth parameter can be any value between 15° - 25°. The value of the twenty-fifth parameter can be 20°. α2 ≥ 20°. It can prevent the inclination angle of the second-stage heat exchanger from being too small, resulting in less air passing through the second-stage heat exchanger, ensure the heat exchange effect of the second-stage heat exchanger, and prevent the condensate water on the second-stage heat exchanger from being difficult to flow down, improving the flow effect of the condensate water.

[0234] In this application, α3 ≤ the value of the twenty-sixth parameter. The value of the twenty-sixth parameter can be any value between 50° - 70°. The value of the twenty-sixth parameter can be 60°. α3 ≤ 60°. It can prevent the inclination angle of the second-stage heat exchanger from being too large and prevent the dimension in the height direction of the main body from being too large.

[0235] In the present application, 20° ≤ α3 ≤ 60°, which facilitates the downward flow of condensate on the second-stage heat exchanger, and while ensuring the heat exchange area of the second-stage heat exchanger, it avoids increasing the size of the main body in the height direction due to the setting of the second-stage heat exchanger.

[0236] In the present application, a plane perpendicular to the length direction of the main body is defined as the first plane.

[0237] In the present application, referring to Figures 19 - 21 , the indoor heat exchanger has a width direction. The two ends in the width direction of the indoor heat exchanger are the top end and the bottom end of the indoor heat exchanger. The indoor heat exchanger is in one section.

[0238] In the present application, the width direction of the indoor heat exchanger is parallel to or lies within the first plane.

[0239] In the present application, referring to Figures 19 - 21 , in the front-rear direction of the main body, the top end of the indoor heat exchanger is in front of the bottom end of the indoor heat exchanger. The included angle between the width direction of the indoor heat exchanger and the second plane is the fifth included angle α5.

[0240] In the present application, α5 ≥ the twenty-ninth parameter value. The twenty-ninth parameter value can be any value between 45° and 55°. The twenty-ninth parameter value can be 45°. α5 ≥ 45°. This can avoid too small an inclination angle of the indoor heat exchanger, enabling the air conditioner indoor unit to have a sufficient inclination angle, facilitating the downward flow of condensate on the indoor heat exchanger, and avoiding the attenuation of the performance of the air conditioner indoor unit caused by condensate.

[0241] In the present application, a volute air outlet is formed on the centrifugal volute. A volute air duct is formed inside the centrifugal volute. The volute air duct communicates with the volute air outlet. The volute air outlet is located at the front end of the volute air duct.

[0242] Referring to Figures 19 - 21 , the distance between the top end and the bottom end of the volute air outlet is the second distance L2. The minimum distance between the top end of the volute air outlet and the indoor heat exchanger is the eleventh distance L11. The minimum distance between the bottom end of the volute air outlet and the indoor heat exchanger is the twelfth distance L12.

[0243] L12 ≥ the thirtieth parameter value. The thirtieth parameter value can be any value between 4 mm and 6 mm. The thirtieth parameter value can be 5 mm. L12 ≥ 5 mm. This avoids too small a twelfth distance, ensuring a certain distance between the bottom end of the volute air outlet and the indoor heat exchanger and avoiding the generation of noise.

[0244] L12 / L2 ≤ the thirty - first parameter value. The thirty - first parameter value can be any value between 1 / 4 and 1 / 2. The thirty - first parameter value can be 1 / 3. L12 / L2 ≤ 1 / 3. Avoiding the second distance being too small resulting in a reduction in the air volume, and avoiding the twelfth distance being too large, can ensure the air volume of the air outlet.

[0245] L11 / L2 ≥ the thirty - second parameter value. The thirty - second parameter value can be any value between 1 / 4 and 3 / 8. The thirty - second parameter value can be 1 / 3. L11 / L2 ≥ 1 / 3. Avoiding the eleventh distance being too small, so that there is a certain distance between the top of the volute air outlet and the indoor heat exchanger, and avoiding generating noise.

[0246] L11 / L2 ≤ the thirty - third parameter value. The thirty - third parameter value can be any value between 5 / 12 and 2 / 3. The thirty - third parameter value can be 1 / 2. L11 / L2 ≤ 1 / 2. Avoiding the eleventh distance being too large can ensure the air volume of the air outlet.

[0247] 1 / 3 ≤ L11 / L2 ≤ 1 / 2. Avoiding the eleventh distance being too small, so that there is a certain distance between the top of the volute air outlet and the indoor heat exchanger, avoiding generating noise and avoiding the eleventh distance being too large, can ensure the air volume of the air outlet.

[0248] L12 ≥ 5mm, L12 / L2 ≤ 1 / 3, 1 / 3 ≤ L11 / L2 ≤ 1 / 2. It can avoid the noise caused by the too - close distance between the indoor heat exchanger and the volute air outlet, and avoid the reduction of the air volume of the air outlet caused by the too - large distance between the indoor heat exchanger and the volute air outlet.

[0249] Set α5 ≥ 45°. It can increase the heat exchanger area of the indoor heat exchanger under the condition that the main body height dimension is relatively determined, improve the heat exchange effect; on the premise of ensuring the heat exchanger area, it can appropriately reduce the height dimension of the main body, improve the installation and use range of the air conditioner indoor unit, enable the air conditioner indoor unit to be installed in small spaces such as kitchens, and can be installed in places with a relatively small height such as door bodies or windows; set L12 ≥ 5mm, L12 / L2 ≤ 1 / 3, 1 / 3 ≤ L11 / L2 ≤ 1 / 2. It can avoid the noise caused by the too - close distance between the indoor heat exchanger and the volute air outlet, and avoid the reduction of the air volume of the air outlet caused by the too - large distance between the indoor heat exchanger and the volute air outlet.

[0250] In this application, refer to Figures 19 - 21 , the centrifugal fan is arranged in the centrifugal volute. The centrifugal motor is connected to the centrifugal fan. The centrifugal motor drives the centrifugal fan to rotate. When the centrifugal fan rotates, the diameter of the largest contour formed by the points on the centrifugal fan is the maximum diameter D1 of the centrifugal fan. In the height direction of the main body, the height difference between the rotation axis of the centrifugal fan and the center of the indoor heat exchanger is the first distance L1.

[0251] In this application, L1 / D1 ≤ the fifth parameter value. The fifth parameter value can be any value between 1 / 3 and 1 / 2. The fifth parameter value can be 1 / 2. L1 / D1 ≤ 1 / 2. This can make the distance between the rotation axis of the centrifugal fan and the center of the indoor heat exchanger in the main body height direction smaller, so that the centrifugal fan and the indoor heat exchanger are arranged as directly opposite as possible, which can make the air passing through the indoor heat exchanger more uniform, improve the heat exchange effect of the indoor heat exchanger, and reduce the problem of condensation caused by overcooling or overheating in the local area of the indoor heat exchanger.

[0252] In this application, the main body may include a water receiving tray 23. The water receiving tray 23 may be disposed in the first cavity. The water receiving tray may be disposed below the indoor heat exchanger to receive the condensed water flowing down from the indoor heat exchanger.

[0253] In this application, refer to Figures 22 - 24 , the indoor heat exchanger may include a first-stage heat exchanger 212. The first-stage heat exchanger has a width direction. The top end and the bottom end of the first-stage heat exchanger are the two ends in the width direction of the first-stage heat exchanger.

[0254] In the front-back direction of the main body, the bottom end of the first-stage heat exchanger is located in front of the top end of the first-stage heat exchanger.

[0255] In this application, the width direction of the first-stage heat exchanger is arranged at an angle with the second plane.

[0256] In this application, the width direction of the first-stage heat exchanger is parallel to or lies in the first plane.

[0257] In this application, refer to Figures 22 - 24 , the indoor heat exchanger may include a second-stage heat exchanger 213. The second-stage heat exchanger may have a width direction. The top end and the bottom end of the second-stage heat exchanger may be the two ends in the width direction of the second-stage heat exchanger.

[0258] In the front-back direction of the main body, the top end of the second-stage heat exchanger is located in front of the bottom end of the second-stage heat exchanger.

[0259] In this application, the width direction of the second-stage heat exchanger is arranged at an angle with the second plane.

[0260] In this application, the width direction of the second-stage heat exchanger is parallel to or lies in the first plane.

[0261] In this application, refer to Figures 22 - 24 , the indoor heat exchanger may include a third-stage heat exchanger 214. The third-stage heat exchanger may have a width direction. The top end and the bottom end of the third-stage heat exchanger may be the two ends in the width direction of the third-stage heat exchanger.

[0262] In this application, the top end of the third-stage heat exchanger is connected to the bottom end of the first-stage heat exchanger.

[0263] In this application, the bottom end of the third-stage heat exchanger is connected to the top end of the second-stage heat exchanger.

[0264] In this application, the width direction of the third-stage heat exchanger is parallel to or lies within the first plane.

[0265] In this application, referring to Figures 22 - 24 , the included angle between the width direction of the first-stage heat exchanger and the width direction of the third-stage heat exchanger is the sixth included angle α6.

[0266] In this application, α6 ≥ the thirty-fifth parameter value. The thirty-fifth parameter value can be any value between 90° and 110°. The thirty-fifth parameter value can be 90°. α6 ≥ 90°. This can prevent the opening between the width direction of the first-stage heat exchanger and the width direction of the third-stage heat exchanger from being too small, avoiding affecting the amount of air passing through the indoor heat exchanger; and when the heat exchange area is relatively determined, it can reduce the size of the main body in the front-back direction, can be installed in small spaces such as kitchens, and can be installed above a door or a window.

[0267] In this application, α6 < the thirty-sixth parameter value. The thirty-sixth parameter value can be any value between 160° and 180°. The thirty-sixth parameter value can be 180°. α6 < 180°. This makes the included angle between the first-stage heat exchanger and the third-stage heat exchanger face the centrifugal fan, and can reduce the size of the main body in the front-back direction, improve the installation applicability range of the air-conditioning indoor unit, and can make the directions of the air passing through the first-stage heat exchanger and the second-stage heat exchanger different. It can disperse the direction of the air flow in advance before the air flows out of the indoor air outlet, and then converge at the indoor air outlet, which can improve the rapid diffusion of the air into the indoor air, avoid direct blowing of the air, and improve the comfort of the air sent out from the indoor air outlet.

[0268] In this application, referring to Figures 22 - 24 , the included angle between the width direction of the third-stage heat exchanger and the width direction of the second-stage heat exchanger is the seventh included angle α7.

[0269] In this application, α7 ≥ the thirty-seventh parameter value. The thirty-seventh parameter value can be any value between 90° and 110°. The thirty-seventh parameter value can be 90°. α7 ≥ 90°. This can prevent the opening between the width direction of the third-stage heat exchanger and the width direction of the second-stage heat exchanger from being too small, avoiding affecting the amount of air passing through the indoor heat exchanger; and when the heat exchange area is relatively determined, it can reduce the size of the main body in the front-back direction, can be installed in small spaces such as kitchens, and can be installed above a door or a window.

[0270] In this application, α7 < the thirty-eighth parameter value. The thirty-eighth parameter value can be any value between 160° and 180°. The thirty-eighth parameter value can be 180°. α7 < 180°. This forms an angle between the third heat exchanger and the second heat exchanger facing the centrifugal fan, which can reduce the size of the main body in the front-back direction, improve the installation applicable range of the air-conditioning indoor unit, and can make the directions of the air flowing through the third heat exchanger and the second heat exchanger different. It can disperse the direction of the air flow in advance before the air flows out of the indoor air outlet, and then converge at the indoor air outlet, which can improve the rapid diffusion of the air into the indoor air, avoid direct blowing of the air, and improve the comfort of the air sent out from the indoor air outlet.

[0271] In this application, the indoor heat exchanger is provided with a first heat exchanger, a second heat exchanger, and a third heat exchanger, which can increase the area of the indoor heat exchanger and improve the heat exchange effect of the indoor heat exchanger under the condition that the size of the main body in the height direction and the size of the main body in the front-back direction are certain.

[0272] Setting the first heat exchanger, the second heat exchanger, and the third heat exchanger, and setting 90° ≤ α6 < 180°, 90° ≤ α7 < 180° can increase the heat exchanger area of the indoor heat exchanger when the height dimension of the main body is relatively determined, and improve the heat exchange effect; on the premise of ensuring the heat exchanger area, it can appropriately reduce the height dimension of the main body, improve the installation and use range of the air-conditioning indoor unit, enable the air-conditioning indoor unit to be installed in small spaces such as kitchens, and can be installed in places with a relatively small height such as door bodies or windows. Moreover, it can make the opening of the indoor heat exchanger facing the centrifugal fan larger, which is convenient for the air blown out from the volute air outlet to reach the indoor heat exchanger, and can make the directions of the air flowing through the first heat exchanger, the second heat exchanger, and the third heat exchanger different. It can disperse the direction of the air flow in advance before the air flows out of the indoor air outlet, and then converge at the indoor air outlet, which can improve the rapid diffusion of the air into the indoor air, avoid direct blowing of the air, and improve the comfort of the air sent out from the indoor air outlet.

[0273] In this application, the centrifugal fan includes a centrifugal volute. A volute air outlet is formed on the centrifugal volute. A volute air duct is formed inside the centrifugal volute. The volute air duct is communicated with the volute air outlet. The volute air outlet is located at the front end of the volute air duct.

[0274] Reference Figures 22 - 24 , the distance between the top end and the bottom end of the volute air outlet is the second distance L2. The minimum distance between the top end of the volute air outlet and the first heat exchanger is the thirteenth distance L13.

[0275] In this application, L13 ≥ the thirty-ninth parameter value. The thirty-ninth parameter value can be any value between 4 mm and 6 mm. The thirty-ninth parameter value can be 5 mm. L13 ≥ 5 mm. This ensures that the distance between the top of the volute air outlet and the first-stage heat exchanger is not too small, avoiding noise generation.

[0276] In this application, L13 / L2 ≤ the fortieth parameter value. The fortieth parameter value can be any value between 1 / 4 and 1 / 2. The fortieth parameter value can be 1 / 3. L13 / L2 ≤ 1 / 3. This ensures that the distance between the top of the volute air outlet and the first-stage heat exchanger is not too large, avoiding too small air volume and air outlet intensity of the indoor heat exchanger.

[0277] In this application, L13 ≥ 5 mm and L13 / L2 ≤ 1 / 3, ensuring that the distance between the top of the volute air outlet and the first-stage heat exchanger is not too small to avoid noise generation, and that the distance between the top of the volute air outlet and the first-stage heat exchanger is not too large to avoid too small air volume and air outlet intensity of the indoor heat exchanger.

[0278] In this application, referring to Figures 22 - 24 , the minimum distance between the bottom of the volute air outlet and the second-stage heat exchanger is the fourteenth distance L14.

[0279] In this application, L14 ≥ the forty-first parameter value. The forty-first parameter value can be any value between 4 mm and 6 mm. The forty-first parameter value can be 5 mm. L14 ≥ 5 mm. This ensures that the distance between the bottom of the volute air outlet and the second-stage heat exchanger is not too small, avoiding noise generation.

[0280] In this application, L14 / L2 ≤ the forty-second parameter value. The forty-second parameter value can be any value between 1 / 4 and 1 / 2. The forty-second parameter value can be 1 / 3. L14 / L2 ≤ 1 / 3. This ensures that the distance between the bottom of the volute air outlet and the second-stage heat exchanger is not too large, avoiding too small air volume and air outlet intensity of the indoor heat exchanger.

[0281] In this application, L14 ≥ 5 mm and L14 / L2 ≤ 1 / 3, ensuring that the distance between the bottom of the volute air outlet and the second-stage heat exchanger is not too small to avoid noise generation, and that the distance between the bottom of the volute air outlet and the second-stage heat exchanger is not too large to avoid too small air volume and air outlet intensity of the indoor heat exchanger.

[0282] In this application, L13 ≥ 5 mm, L13 / L2 ≤ 1 / 3, L14 ≥ 5 mm, L14 / L2 ≤ 1 / 3, such that the distance between the volute air outlet and the indoor heat exchanger cannot be too small to avoid generating noise, and the distance between the volute air outlet and the indoor heat exchanger cannot be too large to avoid too small air volume and air outlet intensity of the indoor heat exchanger.

[0283] In this application, the first-stage heat exchanger includes a first heat exchanger windward surface 2121 on its side close to the centrifugal fan. In the height direction of the main body, the top end of the first heat exchanger windward surface is not lower than the top end of the volute air outlet.

[0284] In this application, referring to Figures 22 - 24 , the height of the volute air outlet in the height direction of the main body is the first height Gang.

[0285] In this application, referring to Figures 22 - 24 , the distance between the top end of the first heat exchanger windward surface and the top end of the volute air outlet in the height direction of the main body is the fifteenth distance L15.

[0286] In this application, L15 / Gang ≥ 0, such that in the height direction of the main body, the top end of the first heat exchanger windward surface is not lower than the top end of the volute air outlet.

[0287] In this application, L15 / Gang ≤ the forty-third parameter value. The forty-third parameter value can be any value between 1 / 4 - 1 / 2. The forty-third parameter value can be 1 / 3. L15 / Gang ≤ 1 / 3. To avoid too low heat transfer efficiency at the top of the first-stage heat exchanger due to the first-stage heat exchanger being too high above the volute air outlet, affecting the heat transfer effect of the first-stage heat exchanger.

[0288] In this application, the second-stage heat exchanger includes a second heat exchanger windward surface 2131 on its side close to the centrifugal fan. In the height direction of the main body, the bottom end of the second heat exchanger windward surface is not higher than the bottom end of the volute air outlet.

[0289] In this application, referring to Figures 22 - 24 , the distance between the bottom end of the second heat exchanger windward surface and the bottom end of the volute air outlet in the height direction of the main body is the sixteenth distance L16.

[0290] In this application, L16 / Gang ≥ 0, such that in the height direction of the main body, the bottom end of the second heat exchanger windward surface is not higher than the bottom end of the volute air outlet.

[0291] In this application, L16 / Gang ≤ the forty-fourth parameter value. The forty-fourth parameter value can be any value between 1 - 2. The forty-fourth parameter value can be 1.5. L16 / Gang ≤ 1.5. To avoid too low heat transfer efficiency at the bottom of the second-stage heat exchanger due to the second-stage heat exchanger being too low below the volute air outlet, affecting the heat transfer effect of the second-stage heat exchanger.

[0292] In the present application, the included angle between the width direction of the third-stage heat exchanger and the second plane is the eighth included angle α8.

[0293] In the present application, α8 ≥ the forty-fifth parameter value. The forty-fifth parameter value can be any value between 45° and 55°. The forty-fifth parameter value can be 45°. α8 ≥ 45°. It can improve the effect of discharging condensate water of the third-stage heat exchanger and avoid the influence of condensate water on the performance degradation of the third-stage heat exchanger.

[0294] In the present application, the centrifugal fan includes a centrifugal volute. A volute air inlet is formed on the centrifugal volute. The centrifugal fan is arranged inside the centrifugal volute. The centrifugal motor is connected to the centrifugal fan and drives the centrifugal fan to rotate. When the centrifugal fan rotates, the maximum contour formed by the points on the centrifugal fan is the outer contour 2221 of the centrifugal fan.

[0295] The volute air inlet is located on both sides of the centrifugal volute in the axial direction of the centrifugal fan.

[0296] In the radial direction of the centrifugal fan, the outer contour of the centrifugal fan surrounds the outside of the volute air inlet.

[0297] Reference Figure 18 , the distance between the volute air inlet and the outer contour of the centrifugal fan in the radial direction of the centrifugal fan is the twentieth distance L20.

[0298] In the present application, L20 ≥ the fifty-seventh parameter value. The fifty-seventh parameter value can be any value between 2 mm and 4 mm. The fifty-seventh parameter value can be 3 mm. L20 ≥ 3 mm. It can improve the air inlet efficiency and avoid air return.

[0299] In the present application, L20 ≤ the fifty-eighth parameter value. The fifty-eighth parameter value can be any value between 18 mm and 22 mm. The fifty-eighth parameter value can be 20 mm. It can make the centrifugal volute block the two ends of the centrifugal fan as much as possible to ensure the air volume.

[0300] In the present application, 3 mm ≤ L20 ≤ 20 mm, it can improve the air inlet efficiency, avoid air return, and can make the centrifugal volute block the two ends of the centrifugal fan as much as possible to ensure the air volume.

[0301] In the present application, the rotation axis of the centrifugal fan can be perpendicular to the first plane.

[0302] In the present application, reference Figure 25 , the shroud has a shroud inner wall surface. The shroud inner wall surface has a shroud inner contour line 22163. The shroud inner contour line includes a tongue inner contour line provided on the volute tongue.

[0303] The inner contour line of the shroud includes a first shroud contour line 221634 that is connected to the inner contour line of the volute tongue.

[0304] The inner contour line 22163 of the shroud is parallel to or lies in the first plane.

[0305] In this application, referring to Figure 25 , the inner contour line of the volute tongue includes a volute tongue air outlet section 221631. The volute tongue air outlet section is provided at one end of the volute tongue that forms the air outlet of the volute casing.

[0306] The inner contour line of the volute tongue further includes a volute tongue air inlet section 226132. The volute tongue air inlet section is provided at one end of the volute tongue that is far from the air outlet of the volute casing.

[0307] The inner contour line of the volute tongue includes a volute tongue connection section 221633. The volute tongue connection section is connected between the volute tongue air inlet section and the volute tongue air outlet section.

[0308] In this application, referring to Figure 25 , the connection point between the volute tongue connection section and the volute tongue air inlet section is the third point A3.

[0309] In this application, in the first plane where the inner contour line 22163 of the shroud is located, the straight line on which the third point A3 and the rotation center of the centrifugal fan are simultaneously located is the first straight line. The intersection point of the first straight line and the first shroud contour line is the fourth point A4.

[0310] In this application, referring to Figure 25 , in the first plane where the inner contour line 22163 of the shroud is located, the straight line perpendicular to the first straight line is the second straight line. The two intersection points of the second straight line and the inner contour line 22163 of the shroud are the fifth point A5 and the sixth point A6 respectively.

[0311] Along the extension direction of the inner contour line 22163 of the shroud, the fifth point A5 is located between the third point A3 and the fourth point A4.

[0312] In this application, referring to Figure 25 , in the first plane where the inner contour line 22163 of the shroud is located, the maximum contour when the centrifugal fan rotates is the first centrifugal fan contour.

[0313] The minimum distance between the third point A3 and the first centrifugal fan contour is the twenty-fourth distance L24.

[0314] The minimum distance between the fourth point A4 and the first centrifugal fan contour is the twenty-fifth distance L25.

[0315] The minimum distance between the fifth point A5 and the first centrifugal fan contour is the twenty-sixth distance L26.

[0316] The minimum distance between the sixth point A6 and the first centrifugal fan contour is the twenty-seventh distance L27.

[0317] L27 ≥ L24. L24 ≥ L25. L25 ≥ L24. This can make the distance between the first contour of the centrifugal fan and the inner contour line 22163 of the shroud gradually increase, and can increase the air pressure in the centrifugal volute.

[0318] L27 / L24 ≥ the sixty-fifth parameter value. The sixty-fifth parameter value can be any value between 4 and 6. The sixty-fifth parameter value can be 4. L27 / L24 ≥ 4. This can increase the air pressure in the centrifugal volute and improve the wind resistance of the volute air duct.

[0319] In this application, referring to Figure 26 , the housing can include a bottom plate 131. The bottom plate can be provided at the bottom of the housing.

[0320] In this application, the indoor air inlet can be formed on the bottom plate.

[0321] In this application, referring to Figure 26 , a first mounting opening 1311 can be formed on the bottom plate 131. The first mounting opening can penetrate the bottom plate in the thickness direction of the bottom plate.

[0322] In this application, referring to Figure 26 , the housing can include an air inlet grille 132. An indoor air inlet can be formed on the air inlet grille. The air inlet grille can be installed in the first mounting opening 1311.

[0323] In this application, the main body can include a first filter screen. The first filter screen is used to filter the air entering the first chamber.

[0324] In this application, the first filter screen can be installed on the housing. The first filter screen can be installed inside the indoor air inlet.

[0325] In this application, referring to Figure 26 , the first filter screen can be installed on the bottom plate 131.

[0326] In this application, the first filter screen can be installed on the air inlet grille.

[0327] In this application, the main body can include an oil fume filter screen. The oil fume filter screen is used to filter oil fume.

[0328] In this application, the oil fume filter screen can be provided inside the indoor air inlet.

[0329] In this application, the oil fume filter screen can be connected to the bottom plate.

[0330] In this application, the oil fume filter screen can be connected to the air inlet grille.

[0331] In this application, the oil and fume filter screen can be connected to the first filter screen.

[0332] In this application, referring to Figure 26 , the casing can include a front panel 133. The front panel 133 can be provided on the front side of the casing. An indoor air outlet can be formed on the front panel 133.

[0333] In this application, referring to Figure 26 , the main body can include a first air deflector 134. The first air deflector is rotatably connected to the casing. The first air deflector can partially open the indoor air outlet.

[0334] Referring to Figure 26 , the main body can include a second air deflector 135. The second air deflector is rotatably connected to the casing. The second air deflector can partially open the indoor air outlet.

[0335] In the height direction of the main body, the first air deflector 134 can be located on the side of the second air deflector closer to the top of the main body.

[0336] The first air deflector and the second air deflector jointly close the indoor air outlet.

[0337] In this application, the first air deflector and the second air deflector can be horizontally arranged simultaneously so that the air blows forward, avoiding direct blowing on people.

[0338] In this application, the first air deflector and the second air deflector can be inclined downward so that the air blows forward and downward, giving a sense of wind to the user.

[0339] In this application, referring to Figure 27 , the air conditioner indoor unit can be an embedded air conditioner indoor unit. The air conditioner indoor unit can be embedded in the ceiling 903.

[0340] In this application, referring to Figure 27 , a first ceiling opening 9031 can be provided on the ceiling 903. The air below the ceiling 903 enters the first cavity through the first ceiling opening 9031.

[0341] In this application, referring to Figure 27 , the air conditioner indoor unit can include an air outlet housing 34. The air outlet housing can be at least partially provided above the ceiling. The air outlet housing can be connected to the casing. The air outlet housing can be located at the indoor air outlet.

[0342] In this application, referring to Figure 27 , an air outlet duct 341 can be formed in the air outlet housing. The air outlet duct can communicate with the first cavity through the indoor air outlet.

[0343] In this application, referring to Figure 27, a second ceiling opening 9032 may be provided on the ceiling. The air in the first cavity flows to the air outlet duct through the indoor air outlet and then flows to the lower part of the ceiling through the second ceiling opening.

[0344] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present application, rather than to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some or all of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present application.

[0345] For the sake of convenience of explanation, the above description has been made in conjunction with specific embodiments. However, the above exemplary discussions are not intended to be exhaustive or to limit the embodiments to the specific forms disclosed above. According to the above teachings, various modifications and variations can be obtained. The selection and description of the above embodiments are for the purpose of better explaining the principles and practical applications, so that those skilled in the art can better use the embodiments and various different variations of the embodiments suitable for specific use considerations.

Claims

1. An air conditioner indoor unit, characterized in that, Comprising: A main body, the height direction of which is from its bottom to its top, and the main body at least includes a first cavity located inside the main body; The main body includes: A casing, which is provided with an indoor air inlet at its bottom, and an indoor air outlet at the front side of the casing. The indoor air outlet and the indoor air inlet are communicated with the first cavity; A centrifugal fan, which is arranged in the first cavity; An indoor heat exchanger, which is arranged in the first cavity; the indoor heat exchanger is located in front of the centrifugal fan and behind the indoor air outlet; Define the plane perpendicular to the height direction of the main body as the second plane; The indoor heat exchanger includes: A first-stage heat exchanger, the two ends of the width direction of which are the top end and the bottom end thereof; in the front-back direction of the main body, the bottom end of the first-stage heat exchanger is located in front of the top end of the first-stage heat exchanger, and the width direction of the first-stage heat exchanger is arranged at an angle with the second plane; A second-stage heat exchanger, the two ends of the width direction of which are the top end and the bottom end thereof. In the front-back direction of the main body, the top end of the second-stage heat exchanger is located in front of the bottom end of the second-stage heat exchanger; the width direction of the second-stage heat exchanger is arranged at an angle with the second plane; A third-stage heat exchanger, the two ends of the width direction of which are the top end and the bottom end thereof. The top end of the third-stage heat exchanger is connected to the bottom end of the first-stage heat exchanger; the bottom end of the third-stage heat exchanger is connected to the top end of the second-stage heat exchanger; The included angle between the width direction of the first-stage heat exchanger and the width direction of the third-stage heat exchanger is the sixth included angle α6, 90°≤α6<180°; The included angle between the width direction of the third-stage heat exchanger and the width direction of the second-stage heat exchanger is the seventh included angle α7, 90°≤α7<180°.

2. The indoor air conditioner according to claim 1, wherein, The centrifugal fan includes: A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside. The volute air duct is communicated with the volute air outlet; the volute air outlet is located at the front end of the volute air duct; A centrifugal fan, which is arranged in the volute air duct; A centrifugal motor, which is connected to the centrifugal fan and drives the centrifugal fan to rotate; The distance between the top end and the bottom end of the volute air outlet is the second distance L2, and the minimum distance between the top end of the volute air outlet and the first-stage heat exchanger is the thirteenth distance L13, L13≥5mm, L13 / L2≤1 / 3.

3. The air conditioner indoor unit according to claim 1, characterized in that, The centrifugal fan includes: A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside. The volute air duct is communicated with the volute air outlet; the volute air outlet is located at the front end of the volute air duct; A centrifugal fan, which is arranged in the volute air duct; A centrifugal motor, which is connected to the centrifugal fan and drives the centrifugal fan to rotate; The distance between the top end and the bottom end of the volute air outlet is the second distance L2, and the minimum distance between the bottom end of the volute air outlet and the second-stage heat exchanger is the fourteenth distance L14, L14≥5mm, L14 / L2≤1 / 3.

4. The air conditioner indoor unit according to claim 1, characterized in that, The centrifugal fan includes: A centrifugal volute, on which a volute air outlet is formed; The first-stage heat exchanger includes a first heat exchanger windward surface on its side close to the centrifugal fan; in the height direction of the main body, the top end of the first heat exchanger windward surface is not lower than the top end of the volute air outlet.

5. The indoor air conditioner according to claim 1, characterized in that, The centrifugal fan includes: A centrifugal volute, on which a volute air outlet is formed; The second-stage heat exchanger includes a second heat exchanger windward surface on its side close to the centrifugal fan; in the height direction of the main body, the bottom end of the second heat exchanger windward surface is not higher than the bottom end of the volute air outlet.

6. The air conditioner indoor unit according to claim 4, wherein, The centrifugal fan includes: A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside it, and the volute air duct is communicated with the volute air outlet; the volute air outlet is located at the front end of the volute air duct; The height of the volute air outlet in the height direction of the main body is the first height H1, and the distance between the top end of the first heat exchanger windward surface and the top end of the volute air outlet in the height direction of the main body is the fifteenth distance L15, 0 ≤ L15 / H1 ≤ 1 / 3.

7. The air conditioner indoor unit according to claim 5, characterized in that, The centrifugal fan includes: A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside it, and the volute air duct is communicated with the volute air outlet; the volute air outlet is located at the front end of the volute air duct; The height of the volute air outlet in the height direction of the main body is the first height H1, and the distance between the bottom end of the second heat exchanger windward surface and the bottom end of the volute air outlet in the height direction of the main body is the sixteenth distance L16, 0 ≤ L16 / H4 ≤ 1.

5.

8. The air conditioner indoor unit according to claim 1, characterized in that, The centrifugal fan includes: A centrifugal volute, on which a volute air outlet is formed and a volute air duct is formed inside it, and the volute air duct is communicated with the volute air outlet; A centrifugal fan, arranged in the volute air duct; A centrifugal motor, connected to the centrifugal fan and driving the centrifugal fan to rotate; The centrifugal volute includes a first side plate, a second side plate and a shroud, the first side plate and the second side plate are arranged opposite to each other and are respectively arranged on both sides of the axis of the centrifugal fan, and the shroud is arranged between the first side plate and the second side plate and surrounds the outside of the centrifugal fan; The shroud, the first side plate and the second side plate are connected to enclose the volute air duct and the volute air outlet; The shroud includes a volute tongue and a first air outlet plate, the first air outlet plate is located above the volute tongue and is arranged at an interval from the volute tongue, and the volute air outlet is formed at the front end of the volute tongue and the first air outlet plate; The minimum distance between the volute tongue and the first air outlet plate is the fifth distance L5, the first air outlet plate includes a first point A, and the minimum distance between the first point A and the volute tongue is the fifth distance, and the first point A is located between the front end and the rear end of the first air outlet plate; When the centrifugal fan rotates, the diameter of the maximum contour formed by the rotation of the points on the centrifugal fan is the maximum diameter D1 of the centrifugal fan, 1 / 3 ≤ L5 / D1 ≤ 1 / 2.

9. The air conditioner indoor unit according to claim 1, wherein The centrifugal fan includes: A centrifugal volute, including a volute tongue; A centrifugal fan, arranged in the centrifugal volute; A centrifugal motor, connected to the centrifugal fan and driving the centrifugal fan to rotate, and the maximum contour formed by the rotation of the points on the centrifugal fan is the outer contour of the centrifugal fan; The minimum distance between the outer contour of the centrifugal fan and the volute tongue is the eighth spacing L8, where 4 mm ≤ L8 ≤ 10 mm.

10. An air conditioner indoor unit, characterized in that, Comprising: A main body, the direction from its bottom to its top being the height direction of the main body, and the main body at least includes a first cavity located within the main body; The main body includes: A casing having an indoor air inlet at its bottom and an indoor air outlet at the front side of the casing, and the indoor air outlet and the indoor air inlet communicate with the first cavity; A centrifugal fan disposed within the first cavity; An indoor heat exchanger disposed within the first cavity; the indoor heat exchanger is located in front of the centrifugal fan and behind the indoor air outlet; Define the plane perpendicular to the height direction of the main body as the second plane; The indoor heat exchanger includes: A first-section heat exchanger, the two ends of its top and its bottom being the two ends in the width direction of the first-section heat exchanger; in the front-rear direction of the main body, the bottom end of the first-section heat exchanger is in front of the top end of the first-section heat exchanger, and the width direction of the first-section heat exchanger is arranged at an angle to the second plane; A second-section heat exchanger, the two ends of its top and its bottom being the two ends in the width direction of the second-section heat exchanger, and in the front-rear direction of the main body, the top end of the second-section heat exchanger is in front of the bottom end of the second-section heat exchanger; the width direction of the second-section heat exchanger is arranged at an angle to the second plane; A third-section heat exchanger, the two ends of its top and its bottom being the two ends in the width direction of the third-section heat exchanger, the top end of the third-section heat exchanger being connected to the bottom end of the first-section heat exchanger; the bottom end of the third-section heat exchanger being connected to the top end of the second-section heat exchanger; The included angle between the width direction of the first-section heat exchanger and the width direction of the third-section heat exchanger is the sixth included angle α6, where 90° ≤ α6 < 180°; The included angle between the width direction of the third-section heat exchanger and the width direction of the second-section heat exchanger is the seventh included angle α7, where 90° ≤ α7 < 180°; The included angle between the width direction of the third-section heat exchanger and the second plane is the eighth included angle α8, where α8 ≥ 45°.

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