Air conditioner indoor unit and air conditioner

Abstract

The utility model relates to the technical field of air conditioning, and discloses an air conditioner indoor unit and an air conditioner. The indoor unit of the air conditioner comprises a shell, an air inlet and an air outlet, the heat exchanger is located in the air duct; the cross-flow fan and the heat exchanger are sequentially arranged in the air duct in the flowing direction of air flow in the air duct; the heat exchanger comprises a first heat exchange section, the first heat exchange section is in a straight plate shape, and the first heat exchange section inclines upwards or downwards in the flowing direction of airflow in the air flue. According to the air conditioner indoor unit, through the arrangement of the cross-flow fan, the heat exchanger and the obliquely-arranged straight plate type first heat exchange section, the heat exchange area and the heat exchange effect can be guaranteed, the thickness of the air conditioner indoor unit can be reduced, in this way, the thickness of a suspended ceiling can be reduced, more indoor space is released, the indoor repression feeling is reduced, and the service life of the air conditioner indoor unit is prolonged. And the user experience is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, for example, relates to an air conditioner indoor unit and air conditioner. BACKGROUND

[0002] At present, the heat exchanger of the indoor unit of the air suction type is located at the air inlet side of the fan, and the airflow after heat exchange with the heat exchanger flows through the fan and then flows out of the indoor unit. The air suction type air conditioner indoor unit is subject to the problem of too much resistance caused by insufficient air inlet space at the rear volute tongue. The height required for the air inlet space is relatively high, resulting in a relatively large thickness of the air conditioner indoor unit.

[0003] Therefore, a blowing type indoor unit is disclosed in the related art, that is, the airflow flows through the fan and the heat exchanger in sequence, so as to reduce the space required for air inlet, and thereby reduce the thickness of the indoor unit. At the same time, in order to ensure the heat exchange amount, the heat exchanger is arranged in an arc shape. In this way, the height of the indoor unit can be appropriately reduced.

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

[0005] In the related art, the heat exchanger of the indoor unit is arranged in an arc shape, which results in a relatively high height of the heat exchanger, and thereby results in a relatively large height of the indoor unit. When the indoor unit needs to be installed in a ceiling, it still occupies a relatively large indoor space, which affects the user's experience.

[0006] It should be noted that the information disclosed in the above background section is only used to strengthen the understanding of the background of the present application, and therefore can include information that does not constitute prior art known to those skilled in the art. Invention content

[0007] In order to have a basic understanding of some aspects of the disclosed embodiments, the following is a simple summary. The summary is not a general review, nor is it intended to determine the key / important elements or to delineate the protection scope of these embodiments, but as a prelude to the detailed description below.

[0008] The embodiments of the present disclosure provide an air conditioner indoor unit and an air conditioner, so as to reduce the thickness and size of the air conditioner indoor unit, release more indoor top space, and improve the user's experience.

[0009] The embodiments of the present disclosure provide an air conditioner indoor unit, which comprises: a shell, an air duct is formed in the shell; a heat exchanger located in the air duct; a cross-flow fan, the cross-flow fan and the heat exchanger are arranged in the air duct in sequence along the flow direction of the airflow in the air duct; wherein the heat exchanger comprises a first heat exchange section, the first heat exchange section is in a straight plate type, and the first heat exchange section is inclined upward or downward along the flow direction of the airflow in the air duct.

[0010] The air conditioner provided by the embodiments of the present disclosure comprises the air conditioner indoor unit as any one of the above embodiments.

[0011] The air conditioner indoor unit and the air conditioner provided by the embodiments of the present disclosure can achieve the following technical effects.

[0012] The air conditioner indoor unit provided by the embodiments of the present disclosure is characterized in that: the cross-flow fan and the heat exchanger are sequentially arranged along a direction from the air inlet to the air outlet, so that the heat exchanger is located at an air outlet side of the cross-flow fan, and the length of the air outlet air duct of the cross-flow fan is increased, thereby increasing the air outlet space and reducing the height of the air duct, and further reducing the thickness of the entire ducted air conditioner. In addition, the heat exchanger comprises a first heat exchange section in a straight plate shape, and the first heat exchange section is arranged to be inclined upward or downward along a flow direction of the airflow in the air duct, so that the heat exchanger can meet the demand for heat exchange area by adjusting the inclination angle, and the height can also be adjusted to be not too high, thereby reducing the thickness of the air conditioner indoor unit. Thus, the air conditioner indoor unit provided by the embodiments of the present disclosure can not only ensure the heat exchange area and the heat exchange effect, but also reduce the thickness of the air conditioner indoor unit, so that when the air conditioner indoor unit needs to be installed inside the ceiling, the thickness of the ceiling can also be reduced, thereby releasing more indoor space, reducing the sense of oppression in the room, and improving the user experience.

[0013] In addition, the general description above and the following description below are only exemplary and explanatory, and are not used to limit the present application. BRIEF DESCRIPTION OF DRAWINGS

[0014] One or more embodiments are exemplarily illustrated by corresponding drawings, which do not constitute a limitation on the embodiments, and elements with the same reference numerals in the drawings are shown as similar elements, the drawings do not constitute a proportional limitation, and wherein:

[0015] Figure 1 is a structural schematic diagram of one perspective of an indoor unit provided by the embodiments of the present disclosure;

[0016] Figure 2 is a structural schematic diagram of another perspective of an indoor unit provided by the embodiments of the present disclosure;

[0017] Figure 3 is a partial structural schematic diagram of an indoor unit provided by the embodiments of the present disclosure;

[0018] Figure 4 is a partial structural schematic diagram of another indoor unit provided by the embodiments of the present disclosure;

[0019] Figure 5 is a structural schematic diagram of another perspective of an indoor unit provided by the embodiments of the present disclosure;

[0020] Figure 6 is a structural schematic view of one air duct provided by an embodiment of the present disclosure;

[0021] Figure 7 is a structural schematic view of one indoor unit provided by an embodiment of the present disclosure from one perspective;

[0022] Figure 8 is a structural schematic view of another indoor unit provided by an embodiment of the present disclosure from another perspective;

[0023] Figure 9 is a partial structural schematic view of another indoor unit provided by an embodiment of the present disclosure;

[0024] Figure 10 is a cross-sectional structural schematic view of one indoor unit provided by an embodiment of the present disclosure;

[0025] Figure 11 is a cross-sectional structural schematic view of another indoor unit provided by an embodiment of the present disclosure;

[0026] Figure 12 is a cross-sectional structural schematic view of another indoor unit provided by an embodiment of the present disclosure;

[0027] Figure 13 is a structural schematic view of another indoor unit provided by an embodiment of the present disclosure;

[0028] Figure 14 is a cross-sectional structural schematic view of another indoor unit provided by an embodiment of the present disclosure;

[0029] Figure 15 is a structural schematic view of another indoor unit provided by an embodiment of the present disclosure;

[0030] Figure 16 is a structural schematic view of another air duct provided by an embodiment of the present disclosure;

[0031] Figure 17 is a cross-sectional structural schematic view of another indoor unit provided by an embodiment of the present disclosure;

[0032] Figure 18 is a partial structural schematic view of another indoor unit provided by an embodiment of the present disclosure;

[0033] Figure 19 is a cross-sectional structural schematic view of another air duct provided by an embodiment of the present disclosure;

[0034] Figure 20 is a structural schematic view of another air duct provided by an embodiment of the present disclosure;

[0035] Figure 21 is a structural schematic view of one volute provided by an embodiment of the present disclosure.

[0036] Reference signs:

[0037] 10, cabinet; 11, air inlet; 12, air outlet; 13, accommodating cavity; 14, side plate; 141, outlet pipe; 20, air duct piece; 21, air duct; 211, fan cavity; 212, diffuser cavity; 2121, upper wall surface of diffuser cavity; 2122, lower wall surface of diffuser cavity; 213, heat exchange cavity; 22, air suction air duct; 23, stepped structure; 231, first step; 232, second step; 233, third step; 24, exhaust passage; 241, exhaust grille; 25, pipe passing space; 251, groove; 26, top wall of air duct piece; 263, lower air duct plate; 27, volute tongue; 271, pressure relief hole; 272, pressure relief passage; 273, first section; 274, second section; 275, clamping hook; 276, sound attenuation cavity; 28, reinforcing rib; 29, air duct side plate; 291, arc-shaped air duct plate; 292, first return air passage; 293, second return air passage; 30, cross-flow fan; 31, impeller; 32, motor; 33, base; 34, motor gland; 35, buckle; 351, first clamping plate; 352, second clamping plate; 36, clamping hole; 40, heat exchanger; 41, first heat exchange section; 42, second heat exchange section; 43, windward surface; 50, pipeline assembly; 51, first pipeline; 52, second pipeline; 53, conversion joint; 54, refrigerant pipe; 60, water pump; 61, water pump water receiving disc; 62, water pump body; 63, float; 64, cover plate; 641, discharge pipe; 65, two-way joint pipe; 66, mounting plate; 67, water receiving disc; 68, pipe passing opening; 69, drainage opening; 70, electric control box; 71, clamping plate; 72, clamping hole; 80, flow guide rib; 81, first flow guide rib; 82, second flow guide rib. DETAILED DESCRIPTION

[0038] In order to enable a more detailed understanding of the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure will be described in detail below with reference to the accompanying drawings, which are for reference only and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, a plurality of details are provided to provide a full understanding of the disclosed embodiments. However, one or more embodiments can still be implemented without these details. In other cases, well-known structures and devices can be simplified to facilitate the drawings.

[0039] The terms "first", "second", and the like in the specification and claims of the embodiments of the present disclosure and the above-described drawings are used to distinguish similar objects, and do not necessarily have to describe a specific order or sequence. It should be understood that the data thus used can be interchanged under appropriate circumstances in order to describe the embodiments of the present disclosure herein. In addition, the terms "include" and "have" and any variations thereof are intended to cover non-exclusive inclusion.

[0040] In this disclosure, the terms "upper," "lower," "inner," "middle," "outer," "front," and "rear," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. These terms are primarily for better description of the embodiments of this disclosure and their implementations, and are not intended to limit the indicated devices, elements, or components to having a specific orientation, or to require them to be constructed and operated in a specific orientation. Furthermore, some of the aforementioned terms may be used to indicate other meanings besides orientation or positional relationship; for example, the term "upper" may in some cases indicate a dependency or connection relationship. Those skilled in the art can understand the specific meaning of these terms in the embodiments of this disclosure according to the specific circumstances.

[0041] Furthermore, the terms "set up," "connect," and "fix" should be interpreted broadly. For example, "connection" can be a fixed connection, a detachable connection, or an integral structure; it can be a mechanical connection or an electrical connection; it can be a direct connection or an indirect connection through an intermediate medium, or it can be an internal connection between two devices, components, or parts. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of this disclosure according to the specific circumstances.

[0042] Unless otherwise stated, the term "multiple" means two or more.

[0043] The term "and / or" describes an association between objects, indicating that three relationships can exist. For example, A and / or B means: A or B, or A and B.

[0044] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0045] For ease of description, the directions up, down, left, right, front, and back in the embodiments of this disclosure are as follows: Figure 2 As shown, the length direction of the indoor unit refers to its left-right direction, the width direction refers to its front-back direction, and the height direction refers to its up-down direction. It should be noted that the height direction of the indoor unit also refers to its thickness direction.

[0046] Combination Figures 1 to 21 As shown, this disclosure provides an indoor unit for an air conditioner, such as... Figure 10As shown, the air conditioner indoor unit includes a shell, the shell is provided with an air inlet 11 and an air outlet 12, and a air duct 21 is further formed in the shell, the air duct 21 is communicated with the air inlet 11 and the air outlet 12, the indoor unit further includes a cross-flow fan 30 and a heat exchanger 40, the cross-flow fan 30 includes an impeller 31, the impeller 31 is rotatably located in the air duct 21, the cross-flow fan 30 can drive the airflow of the air inlet 11 to flow into the air duct 21, heat exchange with the heat exchanger, and then flow out from the air outlet 12, the airflow after heat exchange is cold air or hot air, thereby adjusting the indoor temperature. The heat exchanger 40 and the impeller 31 are arranged in parallel and spaced apart along the flow direction of the airflow in the air duct 21 in the air duct 21.

[0047] In the embodiment of the present disclosure, the cross-flow fan 30 and the impeller 31 are arranged in the direction from the air inlet 11 to the air outlet 12, which reduces the distance between the cross-flow fan 30 and the air inlet 11, and reduces the air inlet resistance. Moreover, the heat exchanger 40 is located on the air outlet side of the cross-flow fan 30, and the length of the air duct on the air outlet side of the cross-flow fan 30 is increased, which increases the air outlet area on the air outlet side, and the height of the air duct 21 on the air outlet side of the cross-flow fan can be appropriately reduced, thereby reducing the thickness of the entire indoor unit. This facilitates the installation of the indoor unit, reduces the thickness of the ceiling, and improves the user experience.

[0048] Optionally, the axial length of the heat exchanger 40 extends along the length direction of the indoor unit; and / or, the axial length of the impeller 31 extends along the length direction of the indoor unit.

[0049] Optionally, the axial direction of the heat exchanger 40 is parallel to the axial direction of the impeller 31, or the axial direction of the heat exchanger 40 and the axial direction of the impeller 31 form an angle, and the angle is less than or equal to 5°. In this way, the space occupied by the heat exchanger and the cross-flow fan can be reduced, and the air outlet amount and air outlet uniformity in the length direction of the indoor unit can be ensured, thereby improving the temperature adjustment effect of the indoor unit.

[0050] Optionally, the indoor unit is installed in a ceiling, the ceiling is provided with a return air inlet and an exhaust air outlet, the return air inlet corresponds to and communicates with the air inlet, and the exhaust air outlet corresponds to and communicates with the air outlet. In this way, the indoor airflow flows into the air duct through the return air inlet and the air inlet, and then flows out of the indoor unit through the air outlet and the exhaust air outlet in sequence.

[0051] Optionally, the bottom wall of the shell is provided with the air inlet 11, and the cross-flow fan 30 corresponds to the air inlet 11, wherein the opening area of the air inlet 11 is greater than or equal to the size of the cross-flow fan 30. In this way, the air inlet 11 is located on the bottom wall of the shell, and when the indoor unit is installed on the ceiling or the ceiling, the air inlet 11 is downward, and the cross-flow fan 30 is located above the air inlet 11. The cross-flow fan 30 can be directly overhauled through the air inlet 11, and the cross-flow fan 30 can be disassembled through the air inlet 11, thereby improving the overhauling convenience of the cross-flow fan 30 and the indoor unit.

[0052] Optionally, the heat exchanger 40 is a fin heat exchanger, the heat exchanger 40 comprises a plurality of fins arranged side by side and a heat exchange pipe, the heat exchange pipe is reciprocally bent and arranged between the plurality of fins, and the heat exchange pipe is filled with the refrigerant.

[0053] Optionally, as shown in Figure 1 and Figure 2 , the air inlet 11 is arranged at the front side of the bottom wall of the shell, the air outlet 12 is arranged at the rear side wall of the shell, and the air outlet 12 corresponds to the heat exchanger 40, so that the airflow after flowing through the heat exchanger 40 can directly flow out from the air outlet 12.

[0054] Optionally, as shown in Figure 10 , the heat exchanger 40 comprises a first heat exchange section 41, the first heat exchange section 41 is in a straight plate type, and the first heat exchange section 41 is inclined upward or downward along the flow direction of the airflow in the air duct 21.

[0055] In the embodiment of the present disclosure, the heat exchanger 40 comprises the first heat exchange section 41 in a straight plate type, and the first heat exchange section 41 is arranged to be inclined upward or downward along the flow direction of the airflow in the air duct 21, so that the heat exchanger 40 can not only meet the demand of the heat exchange area by adjusting the inclination angle, but also can not be too high in height, thereby reducing the thickness of the indoor unit. The indoor unit of the embodiment of the present disclosure can not only guarantee the heat exchange area and the heat exchange effect by the arrangement of the cross-flow fan 30 and the heat exchanger 40 and the inclined arrangement of the first heat exchange section 41 in a straight plate type, but also can reduce the thickness of the indoor unit, so that the thickness of the ceiling can also be reduced, thereby releasing more indoor space, reducing the oppression of the indoor, and improving the user experience.

[0056] Optionally, as shown in Figure 17 , the included angle between the windward surface 43 of the first heat exchange section 41 and the lower wall surface of the air duct 21 is 60°≤γ≤120°.

[0057] In the embodiment of the present disclosure, when the included angle between the windward surface 43 of the first heat exchange section 41 and the lower wall surface of the air duct 21 is less than 60°, the windward surface 43 of the first heat exchange section 41 is too close to the lower wall surface of the air duct 21, which increases the airflow resistance of the airflow flowing through the first heat exchange section 41, resulting in a large loss of air volume and affecting the air outlet of the indoor unit. When the included angle between the windward surface 43 of the first heat exchange section 41 and the lower wall surface of the air duct 21 is greater than 120°, the length of the first heat exchange section 41 will increase, thereby causing the width or length of the indoor unit to increase, which will increase the width or length size of the indoor unit, which is not conducive to the popular use of the indoor unit. Therefore, the inclination angle of the first heat exchange section 41 is within the above range, which can not only guarantee that the airflow resistance at the heat exchanger 40 will not be too large, but also will not affect the size of the width or length of the indoor unit.

[0058] Optionally, 60°≤γ≤90°, or 60°≤γ≤80°.

[0059] For example, γ is 60°, 65°, 70°, 75°, 80°, 85°, 90°, 100°, 110°, or 120°, etc.

[0060] Optionally, the air duct 21 comprises a fan cavity 211 and an air outlet cavity which are sequentially communicated along the air flow direction, the cross-flow fan 30 is located in the fan cavity 211, and the heat exchanger 40 is located in the air outlet cavity, and the flow area of the air outlet cavity gradually increases along the air flow direction in the air duct 21.

[0061] In the embodiment of the present disclosure, the air outlet cavity is located at the air outlet side of the cross-flow fan 30, and the flow area of the air outlet cavity gradually increases along the air flow direction, which can reduce the air flow speed at the center of the air outlet cavity, reduce the flow speed difference between the center of the air duct 21 and the periphery of the air duct 21, reduce the noise, and the flow speed is reduced, which can improve the heat exchange efficiency of the air flow and the heat exchanger 40.

[0062] Optionally, the height of the air outlet cavity gradually increases along the air flow direction in the air duct 21, that is, the distance between the top wall of the air outlet cavity and the bottom wall of the air outlet cavity gradually increases along the air flow direction in the air duct 21. In this way, the air flow in the air outlet cavity can be slowed down, the difference between the air flow speed at the periphery of the air outlet cavity and the air flow speed at the center of the air outlet cavity is reduced, the noise is reduced, and the air flow speed is reduced, so that the air flow can be more fully exchanged with the heat exchanger 40 to ensure the heat exchange area.

[0063] Optionally, the heat exchanger is arranged at the outlet end of the air outlet cavity.

[0064] Optionally, the air duct 21 comprises a fan cavity 211, a pressure expansion cavity 212, and a heat exchange cavity 213, the air outlet cavity comprises the pressure expansion cavity 212 and the heat exchange cavity 213, the cross-flow fan 30 is located in the fan cavity 211, the heat exchanger 40 is located in the heat exchange cavity 213, and the distance between the upper wall surface 2121 of the pressure expansion cavity and the lower wall surface 2122 of the pressure expansion cavity gradually increases along the air flow direction in the pressure expansion cavity 212, that is, the height of the pressure expansion cavity 212 gradually increases along the air flow direction in the air duct 21. In this way, the air flow in the air duct 21 can be slowed down in the pressure expansion cavity 212, the difference between the air flow speed at the periphery of the air duct 21 and the air flow speed at the center of the air duct 21 is reduced, the noise is reduced, and the air flow speed is reduced, so that the air flow can be more fully exchanged with the heat exchanger 40 to ensure the heat exchange area.

[0065] Optionally, the height of the heat exchange cavity 213 is greater than the height of the pressure expansion cavity 212. In this way, the air duct 21 and the heat exchanger 40 can be matched and communicated, so that the air flow in the air duct 21 can flow through the heat exchanger 40 completely. Moreover, the closer to the heat exchanger 40, the further the air flow flow area in the heat exchange cavity increases, which can avoid the formation of more vortexes due to large air flow resistance, reduce the number of vortexes, reduce the air flow return amount, reduce the noise, and reduce the air flow speed to make the air flow in the heat exchange cavity fully exchange heat with the heat exchanger.

[0066] Optionally, the upper wall surface 2121 of the diffuser cavity is inclined downward along the flow direction of the airflow in the air duct 21, and the angle between the upper wall surface 2121 of the diffuser cavity and the horizontal direction is 5°≤α≤15°.

[0067] In the embodiment of the present disclosure, the upper wall surface 2121 of the diffuser cavity is inclined downward along the flow direction of the airflow in the air duct 21, so that the airflow discharged by the cross-flow fan 30 can be better guided to flow into the heat exchanger 40, and the downward inclination also has a downward movement tendency under the gravity of the airflow, thereby reducing the energy consumption of the cross-flow fan and the airflow resistance in the air duct. When the angle between the upper wall surface 2121 of the diffuser cavity and the horizontal direction is less than 5°, the inclination angle of the upper wall surface 2121 of the diffuser cavity is too small, and the airflow guiding effect is small. When the angle between the upper wall surface 2121 of the diffuser cavity and the horizontal direction is greater than 15°, the inclination angle of the upper wall surface 2121 of the diffuser cavity is too large, which can cause the upper wall surface of the air duct 21 to be relatively steep, and part of the airflow flows relatively fast, thereby affecting the airflow flow in the air duct 21 and causing airflow loss. Moreover, if the angle between the upper wall surface 2121 of the diffuser cavity and the horizontal direction is greater than 15°, in order to ensure the flow area of the air duct 21, the height of the air duct 21 can also be increased, which can increase the thickness of the indoor unit. Therefore, the upper wall surface 2121 of the diffuser cavity is within the above inclination angle, which can not only ensure the guiding effect of the airflow, but also reduce the loss of the airflow, and can also reduce the thickness of the indoor unit.

[0068] Optionally, the angle between the upper wall surface 2121 of the diffuser cavity and the horizontal direction is 7°≤α≤13°, or 8°≤α≤12°, or 6°≤α≤11°.

[0069] For example, the angle α between the upper wall surface 2121 of the diffuser cavity and the horizontal direction is 5°, 6°, 7°, 8°, 9°, 10°, 11°, 12°, 13°, 14°, 15°, etc.

[0070] Optionally, the lower wall surface 2122 of the diffuser cavity is inclined downward along the flow direction of the airflow in the air duct 21, and the angle between the lower wall surface 2122 of the diffuser cavity and the horizontal direction is 25°≤β≤35°.

[0071] In the embodiments of the present disclosure, the lower wall surface 2122 of the diffuser chamber is inclined downward along the flow direction of the airflow in the air duct 21, so that the lower wall surface 2122 of the diffuser chamber can guide the airflow to the heat exchanger 40. When the included angle between the lower wall surface 2122 of the diffuser chamber and the horizontal direction is less than 25°, the height of the diffuser chamber 212 changes less, resulting in that the effect of the diffuser chamber 212 is not obvious. When the included angle between the lower wall surface 2122 of the diffuser chamber and the horizontal direction is greater than 35°, the inclination angle of the lower wall surface 2122 of the diffuser chamber is too large, which can cause airflow turbulence, generate noise or affect air volume, and increase the height of the air duct 21, thereby increasing the thickness of the indoor unit. Therefore, the lower wall surface 2122 of the diffuser chamber is within the above range, which can not only ensure the diffuser effect, but also ensure the smoothness of the airflow and the size of the indoor unit.

[0072] Optionally, the included angle between the lower wall surface 2122 of the diffuser chamber and the horizontal direction is 27°≤β≤33°, or 28°≤β≤32°, or 29°≤β≤31°.

[0073] For example, the included angle β between the upper wall surface 2121 of the diffuser chamber and the horizontal direction is 25°, 26°, 27°, 28°, 29°, 30°, 31°, 32°, 33°, 34°, 35°, etc.

[0074] Optionally, the center of the starting end of the diffuser chamber 212 is located above the center line of the height direction of the indoor unit.

[0075] In the embodiments of the present disclosure, the diffuser chamber 212 is located near the upper side of the indoor unit, so that there is enough extension space below the diffuser chamber 212, which can not only ensure the length of the diffuser chamber 212 and the air volume, but also ensure that the components in the shell 10 are more compact, and avoid increasing the thickness of the indoor unit.

[0076] Optionally, the center of the starting end of the diffuser chamber 212 is located above the separation line of three-quarters of the height direction of the indoor unit.

[0077] In the embodiments of the present disclosure, the diffuser chamber 212 is arranged as high as possible, so that there is no extra space above the indoor unit, the size of the indoor unit is reduced as much as possible, and the length of the air duct 21 extending downward is ensured, so that the air volume is ensured while the thickness of the indoor unit is reduced.

[0078] Optionally, the minimum distance from the starting end of the diffuser chamber 212 to the windward surface 43 of the first heat exchange section 41 is greater than the length of the suction air duct 22 on the suction side of the cross-flow fan 30. In this way, the length of the air duct 21 on the air outlet side of the cross-flow fan 30 can be increased to ensure the air volume, and since the air inlet 11 is located on the bottom wall of the shell, the length of the suction air duct 22 is short, so that the thickness of the indoor unit is not increased, thereby ensuring the “ultra-thin” size of the indoor unit.

[0079] Optionally, the indoor unit further comprises a volute tongue 27, the volute tongue 27 is located in the air duct, the volute tongue 27 is arranged on the lower wall of the air duct 21 and corresponds to the cross-flow fan 30; wherein the highest point of the volute tongue 27 is located above the center line of the indoor unit in the height direction.

[0080] In the embodiment of the present disclosure, the volute tongue 27 corresponds to the cross-flow fan 30, and the volute tongue 27 is used to adjust the aerodynamic performance of the cross-flow fan 30, so as to ensure that the cross-flow fan 30 can blow air. The highest point of the volute tongue 27 is located in the upper half of the indoor unit, so that the bottom wall of the starting end of the diffuser chamber 212 is also located above the center line of the indoor unit, so that the diffuser chamber 212 has sufficient extension direction and sufficient inclination angle downward, thereby ensuring the smoothness and air volume of the air outlet in the air duct 21.

[0081] In some optional embodiments, the heat exchanger 40 is a straight plate type as a whole.

[0082] In the embodiment of the present disclosure, the heat exchanger 40 is a straight plate type as a whole, so that the production of the heat exchanger 40 is simple, the cost is low, and the processing is convenient.

[0083] In other optional embodiments, as shown in Figure 11 and Figure 12 , the heat exchanger 40 further comprises a second heat exchange section 42, the second heat exchange section 42 is connected with the first heat exchange section 41, and the second heat exchange section 42 and the first heat exchange section 41 form an included angle at the connection position.

[0084] In the embodiment of the present disclosure, the heat exchanger 40 can also have other shapes, so as to increase the area of the heat exchanger 40 and improve the heat exchange amount.

[0085] Optionally, the included angle between the first heat exchange section 41 and the second heat exchange section 42 is open in the direction of the cross-flow fan 30, so as to further increase the heat exchange area and improve the heat exchange amount.

[0086] Optionally, the second heat exchange section 42 and the first heat exchange section 41 are arranged along the vertical direction, so as to flexibly adjust the area of the heat exchanger 40 and ensure the heat exchange area and the heat exchange amount.

[0087] For example, as shown in Figure 11 , the heat exchanger is V-shaped, and as shown in Figure 12 , the heat exchanger is L-shaped.

[0088] Optionally, the first heat exchange section 41 and the second heat exchange section 42 are arranged in sequence along the flow direction of the air flow, so as to also increase the heat exchange area and improve the heat exchange effect.

[0089] Optionally, as shown in Figure 17 , the ratio of the distance H1 between the center of the impeller 31 of the cross-flow fan 30 and the bottom of the indoor unit to the height M of the whole indoor unit is H1 / M≤0.45.

[0090] In the embodiments of the present disclosure, the impeller 31 of the cross-flow fan 30 is arranged at the lower center of the cross-flow fan 30, so that the length of the air suction duct 22 can be reduced, and the thickness of the indoor unit can be reduced.

[0091] Optionally, H1 / M≤0.4, or H1 / M≤0.35, or H1 / M≤0.3.

[0092] For example, H1 / M is 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, etc.

[0093] Optionally, H1-R≥10mm, where H1 is the distance between the center of the impeller 31 of the cross-flow fan 30 and the bottom wall of the shell, and R is the radius of the impeller 31 of the cross-flow fan 30.

[0094] In the embodiments of the present disclosure, H1-R≥10mm, so that the length of the air suction duct 22 can be ensured not to be too short, and the air inlet amount and air inlet effect of the indoor unit can be ensured.

[0095] Optionally, as shown in Figure 1 , Figures 7 to 9 The shell includes the air duct piece 20 and two side plates 14, the two side plates 14 are arranged at opposite ends of the air duct piece 20, the outer wall surface of the bottom wall of the air duct piece and the side plates 14 form the pipe passing space 25, the side plates 14 are provided with pipe outlets 141, and the two ends of the pipe passing space 25 are in communication with the two pipe outlets 141, respectively. The indoor unit further includes a pipe assembly 50, the pipe assembly 50 is located in the pipe passing space 25, and the pipe assembly 50 can extend out of the pipe passing space 25 through any one of the two pipe outlets 141; wherein the pipe assembly 50 is arranged adjacent to the bottom wall of the air duct piece.

[0096] In the embodiments of the present disclosure, the outer wall surface of the bottom wall of the air duct piece and the side plates 14 form the pipe passing space 25, the pipe assembly 50 can be accommodated in the pipe passing space 25, and the two ends of the pipe passing space 25 are each provided with a pipe passing opening 68, so that the pipe assembly 50 can extend out from any one of the two pipe passing openings 68, and the convenience of pipe connection is improved. Without the need to produce two mirror image models, without the need to wrap a connecting pipe outside the indoor unit, and without the need to bend the pipe, the operation is simple, and the pipe connection is convenient. In addition, the pipe assembly 50 is arranged adjacent to the bottom wall of the air duct piece, so that there is no other component between the pipe assembly 50 and the bottom wall of the air duct piece, the movement and arrangement of the pipe assembly 50 are facilitated, and the pipe assembly 50 does not interfere with other components.

[0097] Optionally, the outer wall surface of the bottom wall of the air duct piece is provided with a clamping piece, the clamping piece is provided with a clamping groove, and the outer wall surface of the pipe assembly 50 can be clamped in the clamping groove. In this way, the pipe assembly 50 can be fixed.

[0098] Optionally, the outer wall surface of the pipeline assembly 50 is in abutment with the bottom wall of the air duct. In this way, the pipeline assembly 50 is as close as possible to the air duct 20, avoiding the increase of the thickness of the indoor unit by the pipeline assembly 50, and also avoiding the pipeline assembly 50 from protruding too much from the indoor unit, thus being damaged or affecting the airflow.

[0099] Optionally, as shown in Figure 10 the shell includes a casing 10 and an air duct 20, the casing 10 defines a receiving cavity 13 with an air inlet 11 and an air outlet 12, the cross-flow fan 30 and the heat exchanger 40 are sequentially arranged in the receiving cavity in the direction from the air inlet 11 to the air outlet 12, and the air duct 20 is located in the receiving cavity 13, and the air duct 20 defines an air duct 21 that is communicated between the cross-flow fan 30 and the heat exchanger 40.

[0100] In the embodiments of the present disclosure, the shell of the indoor unit includes a casing and an air duct 20, the casing is sleeved outside the air duct 20, the air duct 20 internally defines an air duct 21, the inlet of the air duct 21 is communicated with the air inlet 11, and the outlet of the air duct 21 is communicated with the air outlet 12, so that the casing can be used to place other components outside the air duct 20. In addition, the air duct 20 is located in the casing, that is, the casing is sleeved outside the air duct 20, so that the casing can protect the air duct 20, avoiding the air duct 20 from being damaged by the external environment, causing air leakage and other situations.

[0101] Optionally, the casing includes two side plates, the two side plates are located on the left and right sides of the casing, and the two side plates are connected to the left and right ends of the top wall of the casing and the bottom wall of the casing.

[0102] Optionally, the casing is completely sleeved outside the outer wall surface of the air duct 20, so that the air duct 20 can be completely protected.

[0103] Optionally, as shown in Figure 10 the top wall of the casing is located outside the top wall 26 of the air duct, so as to protect the top wall 26 of the air duct.

[0104] Optionally, the bottom wall of the casing is located outside the bottom wall of the air duct, so as to protect the bottom wall of the air duct.

[0105] Optionally, the left and right side walls (i.e., the two side plates 14) of the casing are respectively located outside the left and right side walls of the air duct 20, so as to protect the left and right side walls of the air duct 20.

[0106] Optionally, the casing is provided with the air inlet 11, the inlet of the air duct 21 is located in the receiving cavity 13, and the inlet of the air duct 21 is communicated with the air inlet 11.

[0107] Optionally, the casing is provided with an air outlet 12, the air outlet 12 and the outlet of the air duct 21 are located at the air outlet side and the air inlet side of the heat exchanger 40 respectively, and the outlet of the air duct 21 communicates with the air outlet 12, and the airflow in the air duct 21 can flow out of the heat exchanger 40 after heat exchange.

[0108] Optionally, the top wall of the casing is attached to (fitted to or close to) the top wall 26 of the air duct piece. In this way, the casing can increase the strength of the air duct piece 20 and the top wall of the casing, and avoid damage to the air duct piece 20.

[0109] Optionally, the two side plates of the casing include a left side plate and a right side plate, the right side plate is connected between the right end of the top wall of the casing and the right end of the bottom wall of the casing, the left side plate is connected between the left end of the top wall of the casing and the left end of the bottom wall of the casing, the rear side wall of the casing is connected between the rear end of the top wall of the casing, the rear end of the bottom wall of the casing, the rear end of the left side plate and the rear end of the right side plate, and the rear side wall of the casing is provided with the air outlet 12, and the bottom wall of the casing is provided with the air inlet 11.

[0110] Optionally, the casing further includes a front side wall of the casing, the front side wall of the casing is connected between the front end of the top wall of the casing, the front end of the bottom wall of the casing, the front end of the left side plate and the front end of the right side plate.

[0111] Optionally, as shown in Figure 10 Optionally, the indoor unit further includes a water collecting tray 67, the water collecting tray 67 is located below the heat exchanger 40, and the water collecting tray 67 is used to collect the condensed water of the heat exchanger 40.

[0112] Optionally, one end of the water collecting tray 67 is connected to one end of the bottom wall of the air duct piece, the other end of the bottom wall of the air duct piece is provided with a volute tongue 27, and the other end of the bottom wall of the air duct piece corresponds to the impeller 31.

[0113] Optionally, the bottom wall of the casing is located below the water collecting tray 67, one end of the bottom wall of the casing is connected to one end of the bottom wall of the air duct piece, and the other end of the bottom wall of the casing forms the air outlet 12.

[0114] Optionally, the bottom wall of the air duct piece is detachably connected to the bottom wall of the casing, so that the air duct piece 20 and the casing are convenient to disassemble and assemble.

[0115] Optionally, the bottom wall of the air duct piece is connected to the bottom wall of the casing by screws or buckles 35.

[0116] Optionally, one end of the bottom wall of the air duct piece is detachably connected to the water collecting tray 67, so that the water collecting tray 67 is convenient to disassemble and assemble.

[0117] Optionally, one end of the bottom wall of the air duct piece is connected to the water collecting tray 67 by buckling.

[0118] Optionally, one end of the bottom wall of the air duct piece is provided with a clamping groove, the clamping groove is matched with one end of the water pan 67, and thus the one end of the water pan 67 can be clamped with the clamping groove.

[0119] Optionally, the shell is a sheet metal piece. Optionally, the air duct piece 20 is a plastic piece, so that the cost of the indoor unit can be reduced.

[0120] Optionally, as shown in Figure 1 , Figure 2 and Figure 8 , the shell includes two spaced and opposite side plates 14, and the side plates 14 are provided with pipe outlets 141.

[0121] Optionally, the two side plates 14 are arranged side by side and spaced apart along the width direction of the indoor unit, and the two side plates 14 are respectively located on the left side wall and the right side wall of the indoor unit, so that the pipe assembly 50 can be extended from the left side or the right side of the indoor unit to realize left and right pipe connection.

[0122] Optionally, as shown in Figure 1 , the bottom wall of the air duct piece is protruded towards the air duct 21 to form a groove 251, and the pipe assembly 50 is located in the groove 251.

[0123] In the embodiment of the present disclosure, the bottom wall of the air duct piece forms the groove 251, the groove 251 is provided to avoid more space for installing the pipe assembly 50, and the height of the pipe assembly 50 is reduced, so that the pipe assembly 50 does not increase the thickness of the indoor unit.

[0124] Optionally, the air duct 21 includes a fan cavity 211, a diffuser cavity 212 and a heat exchange cavity 213 connected in sequence along the flow direction of the air flow, and along the flow direction of the air flow in the air duct 21, the height of the diffuser cavity 212 gradually increases, and the pipe space 25 is located between the diffuser cavity 212 and the fan cavity 211.

[0125] In the embodiment of the present disclosure, the height of the diffuser cavity 212 is greater than the height of the fan cavity 211, so that there is a groove 251 at the connection between the diffuser cavity 212 and the fan cavity 211, and the pipe assembly 50 can be placed in the groove 251 formed at the connection between the diffuser cavity 212 and the fan cavity 211, so that the pipe assembly 50 is convenient to arrange, and the diffuser cavity 212 is convenient to form.

[0126] Optionally, as shown in Figure 9 and Figure 14As shown, the pipeline assembly 50 includes a refrigerant pipe 54, which includes a first pipeline 51, a second pipeline 52, and a conversion joint 53. One end of the first pipeline 51 is in communication with the heat exchanger 40. One end of the second pipeline 52 is in communication with the other end of the first pipeline 51, and at least part of the second pipeline 52 is located in the pipe running space 25. The conversion joint 53 is connected between the other end of the first pipeline 51 and the one end of the second pipeline 52 to adjust the angle between the first pipeline 51 and the second pipeline 52, so that the second pipeline 52 can extend out of the pipe running space 25 through any one of the two pipe outlets 141.

[0127] In the embodiments of the present disclosure, the refrigerant pipe is used to realize the inlet and outlet of the heat exchanger 40. The second pipeline 52 is connected with the first pipeline 51 through the conversion joint 53, and the conversion joint 53 can rotate. In this way, the second pipeline 52 can be rotated through the conversion joint 53 to adjust the relative position of the second pipeline 52 and the first pipeline 51. Thus, the second pipeline 52 can extend out of any one of the two pipe outlets 141 on the two sides of the pipe running space 25, so as to communicate the other end of the second pipeline 52 with the outdoor unit.

[0128] Optionally, the side plate 14 and the end of the heat exchanger 40 enclose a mounting space. At least part of the first pipeline 51 is located in the mounting space, and the first pipeline 51 extends along the width direction of the indoor unit, and the second pipeline 52 extends along the length direction of the indoor unit. In this way, the second pipeline 52 can extend out of the pipe outlet 141 on the left side of the indoor unit or the pipe outlet 141 on the right side of the indoor unit through the conversion joint 53.

[0129] For example, when the second pipeline 52 extends out of the pipe outlet 141 on the left side, the second pipeline is located on the left side of the first pipeline. When the first pipeline 51 extends out of the pipe outlet 141 on the right side, the second pipeline is located on the right side of the first pipeline.

[0130] Optionally, the conversion joint 53 is L-shaped.

[0131] Optionally, the other end of the second pipeline 52 is adapted to communicate with one end of a connecting pipe, and the other end of the connecting pipe is in communication with the compressor and / or the outdoor heat exchanger of the outdoor unit to form a refrigerant circulation loop.

[0132] Optionally, the number of the refrigerant pipes 54 is two to realize the inlet and outlet of the heat exchanger 40. Specifically, the number of the first pipes 51 is two, one of which is in communication with the inlet of the heat exchanger 40 and the other of which is in communication with the outlet of the heat exchanger 40, so that the heat exchanger 40 realizes the inlet and outlet from the same side, facilitating the arrangement and connection of the pipes. The number of the second pipes 52 is the same as that of the first pipes 51 and corresponds to the first pipes 51 one by one, so that one of the second pipes 52 is in communication with one of the first pipes 51 to form an inlet pipe and the other of the second pipes 52 is in communication with the other of the first pipes 51 to form an outlet pipe, so that the inlet and outlet of the heat exchanger 40 and the communication with the outdoor unit can be realized.

[0133] Optionally, the two first pipes 51 are arranged side by side and spaced apart along the length direction of the indoor unit.

[0134] Optionally, the two second pipes 52 are arranged side by side and spaced apart along the width direction of the indoor unit in the pipe running space 25, or the two second pipes 52 are arranged side by side and spaced apart along the height direction in the pipe running space 25. In actual use, the arrangement direction of the two second pipes 52 can be set according to the size of the pipe running space 25 and the size of the second pipes 52.

[0135] Optionally, the pipe assembly 50 further comprises an insulation pipe, which is sleeved outside the first pipes 51 and the second pipes 52.

[0136] Optionally, the lower end of the outlet pipe opening 141 is provided with a notch. In this way, the lower end of the outlet pipe opening 141 is not closed, facilitating the taking out or putting into of the pipes from or into the outlet pipe opening 141, and further improving the disassembly and assembly convenience of the pipe assembly 50.

[0137] Optionally, the water pan 67 is provided with a drain opening 69, the water pan 67 abuts against the side plate 14, the side plate 14 is provided with a drain notch, and the drain opening 69 is in communication with the outside through the drain notch. In this way, the water pan 67 can better collect water, and the water in the water pan 67 is prevented from leaking into the indoor unit. The side plate 14 is provided with the drain notch, so that the water in the water pan 67 is drained to the outside through the drain opening 69 and the drain notch, facilitating the drainage of the water in the water pan 67 to the outside of the indoor unit.

[0138] In some optional embodiments, the left and right ends of the water pan 67 are both provided with the drain openings 69, which are adapted to be in communication with the first drain pipe.

[0139] In the embodiments of the present disclosure, the indoor unit can selectively connect the first drain pipe from the left side of the water pan 67 or the right side of the water pan 67 according to the installation position, the other end of the first drain pipe is in communication with the outside, so that the water in the water pan 67 is drained to the outside through the first drain pipe.

[0140] Optionally, the indoor unit further comprises a water pump 60, the water pump 60 is communicated with the water pan 67, the water pump 60 is used for pumping out the water in the water pan 67, the pipeline assembly 50 further comprises a second drain pipe, the second drain pipe is communicated with a water outlet of the water pump 60; wherein at least part of the second drain pipe can be located in the pipe running space 25, and the second drain pipe can extend out of the pipe running space 25 through any one of the two pipe outlets 141.

[0141] In the embodiment of the present disclosure, the water in the water pan 67 is pumped out by the water pump 60, which can improve the drainage efficiency so that the water in the water pan 67 can be completely drained. The second drain pipe is communicated with the water outlet of the water pump 60, so that the second drain pipe can drain the water pumped out by the water pump 60, and the second drain pipe can also be located in the pipe running space 25, so that the drain pipe can also extend from the left side or the right side through the pipe running space 25 to realize the left and right pipe connection of the drain pipe. In this way, the drain pipe also does not need to be wound on the outside of the indoor unit, reducing the complexity of the pipeline setting and improving the convenience of pipe connection.

[0142] Optionally, as shown in Figures 1 to 5 , the water pump 60 is arranged outside the containing cavity 13, or, as shown in Figures 7 to 9 , the water pump 60 is located inside the containing cavity 13 and on one side of the heat exchanger 40.

[0143] In the embodiment of the present disclosure, the water pump 60 can be located outside the containing cavity 13, so that the disassembly and installation of the water pump 60 do not need to open the cabinet, and the disassembly and installation of the water pump 60 can be realized from the outside of the cabinet. The water pump 60 can also be located inside the containing cavity 13 and on one side of the length direction of the heat exchanger 40, so that the water pump 60 can be disassembled and installed from one side of the heat exchanger 40. The water pump 60 does not approach the cross-flow fan 30 and does not interfere with components such as the motor 32 of the cross-flow fan 30, so that the water pump 60 can be independently disassembled and installed, improving the convenience of maintenance of the water pump 60 and improving the convenience of disassembly and maintenance of the cross-flow fan 30.

[0144] Optionally, the water pump 60 is arranged on the side of the side plate 14 away from the containing cavity 13. In this way, the water pump 60 can be connected to the side plate 14, and the water pump 60 can be fixed on the outside of the indoor unit.

[0145] Optionally, as shown in Figure 4 , the water pan 67 comprises a bottom plate and a side edge, the side edge is connected to one side of the bottom plate facing the pipe running space 25 and extends along the height direction of the indoor unit; wherein the side edge is provided with a pipe running opening 68, and the first pipeline 51 extends into the pipe running space 25 through the pipe running opening 68.

[0146] In the embodiments of the present disclosure, the side edge of the water pan 67 can block the water in the water pan 67 from flowing out from one side of the bottom plate towards the pipe running space 25. The side edge is provided with a pipe running opening 68, and the pipe running opening 68 is convenient for the pipe running opening 68 of the first pipe 51 to pass through and extend into the pipe running space 25, so as to ensure the water storage capacity of the water pan 67.

[0147] Optionally, as shown in Figure 3 and Figure 4 When the water pump 60 is located outside the accommodating cavity 13, the water pump 60 is connected with the water outlet 69 through the water drainage gap, and the water pump 60 includes a water pump water pan 61 and a water pump body 62, the water pump body 62 is located in the water pump water pan 61, and the water pump body 62 is used for draining water in the water pump water pan 61; the indoor unit further includes a two-way joint pipe 65, which is connected between the water outlet 69 and the water pump water pan 61, so that the water in the water pan 67 is drained into the water pump water pan 61 through the two-way joint pipe 65.

[0148] In the embodiments of the present disclosure, the water pump water pan 61 is connected with the water inlet of the water pan 67 through the two-way joint pipe 65, so that under the driving of the water pump body 62, the water pump body 62 can pump the water in the water pan 67 into the water pump water pan 61, and then the water pump body 62 drains the water in the water pump water pan 61. The two-way joint pipe 65 is connected between the water pan 67 and the water pump water pan 61 to realize the connection between the water pump 60 and the water pan.

[0149] Optionally, the two-way joint pipe 65 is a flexible pipe. In this way, the arrangement of the two-way joint pipe 65 can be adjusted, and the installation flexibility is improved.

[0150] Optionally, the water pump 60 further includes a float 63, a cover plate and a discharge pipe 641, the float 63 is arranged in the water pump water pan 61; the cover plate is arranged above the water pump water pan 61 and is provided with a through hole; the discharge pipe 641 is connected with the water outlet of the water pump 60 and extends out of the cover plate through the through hole, and the discharge pipe 641 is adapted to be connected with the second water drainage pipe.

[0151] In the embodiments of the present disclosure, the float 63 is arranged in the water pump water pan 61, and the float 63 is used for detecting the water level in the water pump water pan 61. The cover plate can cover the water pump water pan 61, so as to avoid water in the water pump water pan 61 from overflowing. The cover plate is further provided with a through hole, and the discharge pipe 641 extends out of the through hole and can be connected with the second water drainage pipe, so that the water pump body 62 can drive the water in the water pump water pan 61 to flow out of the water pump 60 through the discharge pipe 641 and then flow out through the second water drainage pipe.

[0152] Optionally, as shown in Figure 9As shown, when the water pump 60 is located outside the accommodating cavity 13, the water pump 60 is located at one of the left side and the right side of the indoor unit, when the indoor unit needs to drain water from one of the left side and the right side of the indoor unit, the second drain pipe directly communicates with the discharge pipe of the water pump, and the second drain pipe is located outside the accommodating cavity 13. When the indoor unit needs to drain water from the other of the left side and the right side of the indoor unit, the second drain pipe can be moved into the pipe running space 25, and then extended from the pipe outlet 141 of the other of the left side and the right side of the pipe running space 25, so as to realize the left and right connection of the drain pipe when the water pump 60 is located outside.

[0153] Optionally, when the water pump 60 is located in the accommodating cavity 13 and located at one side of the length direction of the heat exchanger 40, the side plate 14 and the end of the length direction of the heat exchanger 40 enclose a mounting space, the water collecting tray 67 covers the bottom of the heat exchanger 40 and the mounting space, the water pump 60 is located in the mounting space, the water inlet of the water pump 60 communicates with the water collecting tray 67, and the water outlet of the water pump 60 communicates with the drain port 69.

[0154] In the embodiment of the present disclosure, the water pump 60 can also be arranged in the accommodating cavity 13 and located between the heat exchanger 40 and the side plate 14, so that the water pump 60 can be directly located in the water collecting tray 67, and the water pump 60 can pump the water in the water collecting tray 67 to the drain port 69 to discharge outside the indoor unit, and the second drain pipe communicates with the water outlet of the water pump 60.

[0155] Optionally, when the water pump 60 is located at one side of the length direction of the heat exchanger 40, when water needs to be drained from one side of the length direction of the heat exchanger 40, the second drain pipe is located outside the accommodating cavity 13, and the second drain pipe communicates with the water pump 60 to directly drain the water in the water collecting tray 67. When water needs to be drained from the other side of the length direction of the heat exchanger 40 (that is, the side away from the water pump 60), the second drain pipe communicates with the water outlet of the water pump 60, and then the second drain pipe is moved into the pipe running space 25 and extends from the pipe outlet 141 of the other end of the pipe running space 25 away from the water pump 60 to drain water.

[0156] Optionally, the air duct 20 is provided with a fixing hole, and when the second drain pipe is located in the pipe running space 25, the second drain pipe is fixed to the bottom wall of the air duct through the fixing device passing through the fixing hole, so that the second drain pipe can be fixed.

[0157] Optionally, the fixing device is a binding fixing device such as a cable tie.

[0158] Optionally, the water pump 60 is detachably connected with the shell. In this way, the water pump 60 can be fixed to the shell or detached from the shell, so as to facilitate the maintenance and disassembly of the water pump.

[0159] Optionally, the indoor unit further comprises a mounting plate 66 connected between the water pump 60 and the side plate 14; when the water pump 60 is located outside the accommodating cavity 13, the mounting plate 66 is connected between the wall surface of the side plate 14 facing away from the accommodating cavity 13 and the water pump 60; or when the water pump 60 is located inside the accommodating cavity 13, one end of the mounting plate 66 is connected with the side plate 14 and the other end of the mounting plate 66 is connected above the water pump 60.

[0160] In the embodiments of the present disclosure, the water pump 60 is connected with the side plate 14 through the mounting plate 66, so that the water pump 60 can be stably installed in the cabinet. When the water pump 60 is located outside the accommodating cavity 13, the mounting plate 66 is connected between the outer wall surface of the side plate 14 and the water pump 60, so that the water pump 60 can be hung outside the cabinet. When the water pump 60 is located inside the accommodating cavity 13, the water pump 60 can be installed on the side plate 14 through the mounting plate, so that the installation and fixation of the water pump 60 can also be achieved.

[0161] Optionally, when the water pump 60 is installed outside the accommodating cavity 13, the mounting plate 66 is in a straight plate shape, and the side plate 14 and the water pump 60 are connected on two sides of the mounting plate 66 respectively.

[0162] Optionally, when the water pump 60 is installed inside the accommodating cavity 13, the mounting plate is in an L shape, so that the mounting plate 66 can be connected above the water pump 60 to improve the connection stability with the water pump 60, and can also be attached to and connected with the side plate 14.

[0163] Optionally, the mounting plate 66 and the side plate 14 are detachably connected. The water pump 60 can be disassembled from the cabinet by detaching the mounting plate 66.

[0164] Optionally, the mounting plate 66 and the side plate 14 are connected through screws. The connection through screws makes the disassembly of the mounting plate 66 and the side plate 14 more convenient and has a lower cost.

[0165] Optionally, the mounting plate 66 is provided with a first screw hole, the side plate 14 is provided with a second screw hole, the first screw hole and the second screw hole correspond to each other, and a screw or a bolt passes through the first screw hole and the second screw hole to realize the connection of the mounting plate 66 and the side plate 14.

[0166] Optionally, the number of the first screw holes is multiple, the multiple first screw holes are arranged at intervals along the circumference of the mounting plate 66, the number of the second screw holes is the same as and corresponds to the number of the first screw holes, so that the connection stability of the mounting plate 66 and the side plate 14 can be improved.

[0167] Optionally, as shown in FIG. 6, the mounting plate 66 is provided with a plurality of first screw holes 661, and the side plate 14 is provided with a plurality of second screw holes 141 corresponding to the first screw holes 661. Figures 1 to 3 , Figures 7 to 9As shown, the indoor unit further comprises an electric control box 70, and the length directions of the cross-flow fan 30 and the heat exchanger 40 extend along the length direction of the indoor unit. The electric control box 70 is arranged at one side of the length direction of the indoor unit, and is located in the accommodating cavity 13 or outside the accommodating cavity 13.

[0168] In the embodiment of the present disclosure, the length directions of the cross-flow fan 30 and the heat exchanger 40 extend along the length direction of the indoor unit. The electric control box 70 is arranged at one side of the length direction of the indoor unit and is located in the accommodating cavity 13 or outside the accommodating cavity 13, so that the electric control box 70 is independently arranged and does not interfere with the pipeline assembly 50, thereby improving the disassembly convenience of the electric control box 70. In the embodiment of the present disclosure, when the electric control box 70 is located inside the accommodating cavity 13, the internal structure of the indoor unit is more compact, and the electric control box 70 is prevented from being damaged by the external environment. When the electric control box 70 is located outside the accommodating cavity 13, the installation and disassembly of the electric control box 70 are more convenient.

[0169] Optionally, the electric control box 70 is arranged at one side of the length direction of the cross-flow fan 30.

[0170] In the embodiment of the present disclosure, the electric control box 70 is arranged at one side of the length direction of the cross-flow fan 30, so that the electric control box 70 is conveniently connected with the motor 32 of the cross-flow fan 30, so as to reduce the distance between the electric control box 70 and the motor 32 of the cross-flow fan 30 and facilitate the wiring of the electric control box 70.

[0171] Optionally, the electric control box 70 is detachably connected with the side plate 14.

[0172] In the embodiment of the present disclosure, the electric control box 70 is fixed to the side plate 14, so that the electric control box 70 is arranged at the left side or the right side of the accommodating cavity 13, so that the electric control box 70 does not increase the thickness of the indoor unit, thereby ensuring that the thickness of the indoor unit is not too large and realizing the "ultra-thin" arrangement of the indoor unit.

[0173] Optionally, the electric control box 70 is screw-connected with the side plate 14. The screw connection between the electric control box 70 and the side plate 14 also makes the disassembly and installation of the electric control box 70 more convenient and has lower production cost.

[0174] In the embodiment of the present disclosure, whether the electric control box 70 is located outside the accommodating cavity 13 or inside the accommodating cavity 13, the electric control box 70 can be screw-connected with the side plate 14, so as to facilitate the connection between the electric control box 70 and the side plate 14 and adopt screw connection which has lower cost and is easy to produce and process.

[0175] Optionally, as shown in FIG. 6, the electric control box 70 is arranged at one side of the length direction of the cross-flow fan 30. Figure 18As shown, when the electric control box 70 is located outside the accommodating cavity 13, the electric control box 70 is provided with a clamping plate 71 on one side of the side plate 14, the side plate 14 is provided with a clamping hole 72, the clamping plate 71 extends along the height direction of the indoor unit, and when the clamping plate 71 is located in the clamping hole 72, the electric control box 70 is connected with the side plate 14. In this way, the clamping plate extends along the height direction of the indoor unit, so that the clamping plate can be inserted into or removed from the clamping hole in the vertical direction. Moreover, the structure of the clamping plate and the clamping hole facilitates the disassembly of the electric control box 70 from the ceiling space.

[0176] Optionally, the clamping plate extends in a direction from bottom to top, so that the clamping plate can be inserted into the clamping hole in a direction from bottom to top, and the clamping plate can also be separated from the clamping hole in a direction from top to bottom, so as to realize the connection and disassembly of the electric control box 70 and the side plate 14.

[0177] It can be understood that the electric control box 70 can also be installed at other positions, for example, the electric control box 70 can be installed on one side of the air duct 20 or on one side of the heat exchanger 40. In actual use, the position of the electric control box 70 can be set according to the size of the indoor unit.

[0178] Optionally, as shown in Figure 1 and Figure 7 , the cross-flow fan 30 further includes an impeller 31 and a motor 32, the motor 32 is located on one side of the impeller 31 facing the electric control box 70 and between the impeller 31 and the electric control box 70, the motor 32 is connected with the impeller 31 and is used to drive the impeller 31 to rotate.

[0179] In the embodiment of the present disclosure, the motor 32 is located on one side of the impeller 31 facing the electric control box 70, so that the motor 32 and the electric control box 70 are arranged on the same side of the impeller 31, which facilitates the electrical connection of the electric control box 70 and the motor 32 and reduces the wiring distance of the circuit.

[0180] Optionally, as shown in Figure 5 and Figure 6 , the indoor unit further includes a base 33 and a motor gland 34, the base 33 is constructed with a mounting groove; the motor gland 34 is arranged below the mounting groove, the motor gland 34 and the mounting groove enclose a motor 32 cavity, and the motor 32 is located in the motor 32 cavity; wherein the motor gland 34 is detachably connected with the base 33.

[0181] In the embodiment of the present disclosure, the base 33 is constructed with a mounting groove, the mounting groove is used to mount and fix the motor 32, and the motor gland 34 can cover the mounting groove, so that the motor gland 34 can fix the motor 32 and avoid shaking and damage of the motor 32. The motor gland 34 is detachably connected with the base 33, so that the motor gland 34 can be detached from the base 33 to facilitate the disassembly of the motor 32, and further facilitate the maintenance and replacement of the fan.

[0182] Optionally, the motor gland 34 is configured with a clamping hole 36, and the base 33 is configured with a clasp 35 towards the end surface of the motor gland 34, and the motor gland 34 is clamped with the base 33 when the clasp 35 is located in the clamping hole 36.

[0183] In the embodiment of the present disclosure, the motor gland 34 and the base 33 are clamped through the clasp 35 and the clamping hole 36, which can improve the operation convenience of dismounting and mounting the motor gland 34 and the base 33.

[0184] Optionally, when the motor gland 34 is clamped with the base 33, the clasp 35 comprises a first clamping plate 351 and a second clamping plate 352, and the second clamping plate 352 is arranged in parallel and spaced apart from the first clamping plate 351; wherein the first clamping plate 351 and the second clamping plate 352 are made of elastic material, and the first clamping plate 351 and the second clamping plate 352 can move towards or away from each other, and when the first clamping plate 351 and the second clamping plate 352 move towards each other, the first clamping plate 351 and the second clamping plate 352 elastically deform and can be separated from the clamping hole 36.

[0185] In the embodiment of the present disclosure, the first clamping plate 351 and the second clamping plate 352 can move towards or away from each other, so that when the first clamping plate 351 and the second clamping plate 352 are in the original state, the first clamping plate 351 and the second clamping plate 352 can be clamped with the clamping hole 36, and the clasp 35 is prevented from being separated from the clamping hole 36. When the first clamping plate 351 and the second clamping plate 352 are pinched and moved towards each other, the area of the clasp 35 formed by the first clamping plate 351 and the second clamping plate 352 decreases, and the first clamping plate 351 and the second clamping plate 352 can be separated from the clamping hole 36, so that the clasp 35 is separated from the clamping hole 36. Thus, when the motor gland 34 needs to be dismounted, the clasp 35 can be separated from the clamping hole 36 by pinching and moving the first clamping plate 351 and the second clamping plate 352 towards each other, so that the motor gland 34 and the base 33 are separated.

[0186] Optionally, the clasp 35 extends towards the air inlet 11, so that when the cross-flow fan 30 is dismounted from the air inlet 11, the clasp 35 directly faces the air inlet 11, and the connection and dismounting of the clasp 35 and the clamping hole 36 can be realized by moving the first clamping plate 351 and the second clamping plate 352.

[0187] Optionally, the motor gland 34 and the base 33 are arranged in sequence in the direction from the air inlet 11 to the cross-flow fan 30, so that the motor gland 34 faces the air inlet 11, which facilitates the dismounting and mounting of the motor gland 34.

[0188] Optionally, the motor gland 34 is screw-connected with the base 33.

[0189] In the embodiment of the present disclosure, the motor gland 34 is screw-connected with the base 33, which can also improve the connection convenience of the motor gland 34 and the base 33, and the operation is simple and the cost is low.

[0190] Optionally, when the motor gland 34 and the base 33 are screwed together, the motor gland 34 and the base 33 are both provided with screw holes, and the screw holes both extend in the direction from the cross-flow fan 30 to the air inlet 11, so that the screw for connecting the motor gland 34 and the base 33 can be moved in and out of the screw from the air inlet 11.

[0191] Optionally, as shown in Figure 6 , the air duct member 20 is of an integrated structure.

[0192] In the embodiment of the present disclosure, the air duct member 20 is of an integrated structure, and compared with the split air duct member 20, the integrated air duct member 20 has lower requirements for assembly, which facilitates the installation of the air duct member 20 in the indoor unit, and the air duct member 20 will not have gaps, and problems such as air volume loss and abnormal sound will not occur, which can further reduce noise and ensure the air outlet effect.

[0193] Optionally, the air duct member 20 and the base 33 are of an integrated structure.

[0194] In the embodiment of the present disclosure, the air duct member 20 and the base 33 are also of an integrated structure, which facilitates the production and processing of the air duct member 20, and avoids the separate assembly of the base 33, avoiding the inaccuracy of the assembly of the split air duct member 20 and the base 33 or the deformation of the air duct member 20 and the base 33 which cannot be installed.

[0195] In some optional embodiments, as shown in Figure 3 , the top wall of the indoor unit includes the top wall of the housing and at least part of the upper side wall of the air duct member 20.

[0196] In the embodiment of the present disclosure, at least part of the upper side wall of the air duct member 20 can directly serve as the top wall of the indoor unit, so that compared with completely using the top wall of the housing as the top wall of the air duct member 20, at least part of the upper side wall of the air duct member 20 as the top wall of the indoor unit can further reduce the product cost of the indoor unit, and can further reduce the thickness of the indoor unit.

[0197] Optionally, the top wall 26 of the air duct member is arc-shaped, and the opening of the arc-shaped top wall 26 faces the air duct 21. In this way, the airflow in the air duct 21 flows more smoothly, reducing airflow loss and ensuring air volume.

[0198] Optionally, the outer wall surface of the top wall 26 of the air duct member is provided with a reinforcing rib 28, and the upper wall surface of the reinforcing rib 28 includes a first wall surface extending in the horizontal direction, and the first wall surface and the outer wall surface of the top wall of the housing form the outer wall surface of the upper side wall of the indoor unit, and the first wall surface is flush with the outer wall surface of the top wall of the housing. In this way, the upper wall surface of the indoor unit can be in the same plane, facilitating the horizontal placement of the indoor unit.

[0199] Optionally, the upper wall surface of the reinforcing rib 28 further comprises a second wall surface, the second wall surface is connected with the first wall surface, and the second wall surface is located below the top wall of the casing, so that the reinforcing rib 28 can support the top wall of the casing, and the setting stability and strength of the top wall of the casing are improved.

[0200] Optionally, the reinforcing rib 28 extends along the flow direction of the airflow in the air duct 21, the lower end of the reinforcing rib 28 is connected with the outer wall surface of the top wall 26 of the air duct member, and the wall surface of the upper end of the reinforcing rib 28 comprises a first wall surface. In this way, the upper end of the reinforcing rib 28 extends in the horizontal direction, so that the top wall of the indoor unit can be located in the same horizontal plane. Moreover, the reinforcing rib 28 can improve the structural strength of the air duct member 20.

[0201] Optionally, the reinforcing rib 28 extends along the width direction of the indoor unit, and the number of the reinforcing ribs 28 is multiple, and the multiple reinforcing ribs 28 are sequentially and spacedly arranged along the width direction of the air duct member 20 (that is, the width direction of the indoor unit). In this way, the multiple reinforcing ribs 28 make the top wall of the indoor unit located in the same plane.

[0202] Optionally, the outer wall surface of the upper top wall of the air duct member 20 is further provided with a connecting rib, the connecting rib extends along the length direction of the indoor unit, and the connecting rib is connected between the multiple reinforcing ribs 28. In this way, the setting stability of the connecting rib can be ensured, and the deformation of the reinforcing rib 28 is avoided.

[0203] Optionally, the number of the connecting ribs is multiple, and the multiple connecting ribs are sequentially and spacedly arranged along the flow direction of the airflow in the air duct 21 (that is, the width direction of the indoor unit), so that the strength of the top wall 26 of the air duct member is improved.

[0204] In other optional embodiments, the top wall of the casing is the top wall of the indoor unit, that is, the top wall of the casing completely covers the top wall of the air duct member.

[0205] Optionally, the top wall and / or the bottom wall of the casing extend in the horizontal direction.

[0206] In the embodiments of the present disclosure, the air duct member 20 is located in the casing, and the top wall of the casing and / or the bottom wall of the casing can extend in the horizontal direction, so that the top and the bottom wall of the indoor unit both extend in the horizontal direction, which facilitates the manner and installation of the indoor unit, and makes the indoor unit more conformably installed on the ceiling, and reduces the space occupied by the indoor unit in the suspended ceiling.

[0207] Optionally, as shown in Figure 5 and Figure 16 the axial length of the heat exchanger 40 is greater than the axial length of the impeller 31.

[0208] In the embodiments of the present disclosure, the axial length of the impeller of the cross-flow fan is less than the axial length of the heat exchanger, and the heat exchanger and the impeller are located in the air duct, so that the heat exchange area of the airflow flowing through the impeller and the heat exchanger in the length direction can be increased, without increasing the height of the heat exchanger, thereby improving the heat exchange efficiency of the indoor unit. In this way, the length of the heat exchanger is greater than the length of the impeller, so that the heat exchange capacity of the heat exchanger can be ensured, and the height of the heat exchanger and the indoor unit can be reduced, thereby reducing the thickness of the ceiling and releasing more indoor space, and improving the user experience. Moreover, when the airflow at the impeller 31 flows to the heat exchanger 40 along the air duct 21, since the length of the heat exchanger 40 is long, the airflow flowing from the impeller 31 to the heat exchanger 40 can increase the flow area, thereby reducing the wind pressure at the center of the air duct 21, dispersing the wind speed, and reducing the wind speed difference between the center and the two sides of the air duct 21, thereby playing a uniform flow role and making the airflow in the air duct 21 flow more uniformly. In this way, the airflow in the air duct 21 can be fully heat-exchanged with the heat exchanger 40 in the length direction, thereby improving the heat exchange efficiency with the heat exchanger 40 to a certain extent, and reducing noise.

[0209] Optionally, the length of the air duct piece 20 gradually increases along the airflow direction in the air duct 21, so that the air outlet of the impeller 31 can flow to the heat exchanger 40.

[0210] Optionally, the diffuser cavity 212 and the heat exchange cavity 213 form an air outlet cavity, and the length and height of the air outlet cavity gradually increase along the airflow direction in the air outlet cavity. In the embodiments of the present disclosure, the fan cavity 211 is used to place the fan, and the length and height of the air outlet cavity gradually increase, so that the flow area of the air duct 21 can be increased in the length direction and the height direction, so that the airflow can be slowed down, the airflow speed at the periphery of the air duct 21 and the airflow speed at the center can be reduced, and the airflow speed can be slowed down, so that the airflow can be more fully heat-exchanged with the heat exchanger 40 to ensure the heat exchange area.

[0211] Optionally, the motor 32 is arranged at the first end in the length direction of the impeller 31; the second end in the length direction of the impeller 31 is flush with the second end in the length direction of the heat exchanger 40, and the first end in the length direction of the heat exchanger 40 protrudes from the first end in the length direction of the impeller 31.

[0212] In the embodiments of the present disclosure, the impeller 31 is flush with one end of the heat exchanger 40, and the second end of the heat exchanger 40 protrudes from the second end of the heat exchanger 40, so that the installation of the heat exchanger 40 and the cross-flow fan 30 is facilitated, and the production and processing of the air duct 21 in the shell are also facilitated. In addition, only one end of the heat exchanger 40 protrudes from the impeller 31, so that the space on one side of the air duct 21 is large, components can be concentrated, and the compactness of the overall structure is improved.

[0213] Optionally, the air duct piece 20 comprises a side air duct plate located at the left side of the air duct and / or the right side of the air duct, the side air duct plate comprises a first side air duct plate and a second side air duct plate connected in sequence along the flow direction of the airflow in the air duct, the first side air duct plate is located at one side of the fan cavity, and the second side air duct plate is located at one side of the air outlet cavity; wherein the second side air duct plate comprises an arc-shaped air duct plate 291 with a smooth transition.

[0214] In the embodiment of the present disclosure, the second side air duct plate comprises an arc-shaped air duct plate 291 with a smooth transition, so that the inner wall of the air duct is smoother, the flow loss of the airflow in the air duct is reduced, and the airflow of the cross-flow fan can flow smoothly to the heat exchanger.

[0215] Optionally, the opening of the arc-shaped air duct plate faces away from the air duct, so that the length of the air duct along the flow direction of the airflow can gradually increase.

[0216] Optionally, the number of side air duct plates is one or two, when the number of side air duct plates is two, the two side air duct plates are located at the left and right sides of the air duct respectively, and at least one side air duct plate comprises an arc-shaped air duct plate. Here, the structure of the side air duct plate is adjusted according to the length of the heat exchanger and the impeller.

[0217] Optionally, the air duct piece 20 comprises a lower air duct plate and an upper air duct plate, the lower air duct plate is configured with a volute tongue 27 matched with the impeller 31; the upper air duct plate is located above the lower air duct plate and encloses the air duct 21 with the lower air duct plate, wherein the distance between the upper air duct plate and the lower air duct plate gradually increases along the flow direction of the airflow in the air duct 21, and here, the top wall 26 of the air duct piece comprises the upper air duct plate, and the bottom wall of the air duct piece comprises the lower air duct plate.

[0218] In the embodiment of the present disclosure, the upper air duct plate and the lower air duct plate enclose the air duct 21 from top to bottom, and the distance between the upper air duct plate and the lower air duct plate gradually increases along the flow direction of the airflow in the air duct 21, so that an expansion chamber 212 can be formed, the airflow can be slowed down, the airflow velocity at the periphery of the air duct 21 and the airflow velocity at the center are reduced, the noise is reduced, and the airflow velocity is slowed down, so that the airflow can be more fully exchanged with the heat exchanger 40 to ensure the heat exchange area.

[0219] Optionally, as shown in Figure 10 , Figures 13 to 14 , a noise reduction structure is configured in the air duct 21. The noise reduction structure is configured in the air duct 21, so that the noise in the air duct 21 can be reduced, and the noise of the indoor unit during operation is reduced, and the user experience is improved.

[0220] Optionally, as shown in Figure 10 and Figure 17 , part of the wall surface of the air duct 21 protrudes towards the inside of the air duct 21 to form a step structure 23, the step structure 23 is used to prevent backflow of the airflow in the air duct 21, and the noise reduction structure comprises the step structure 23.

[0221] In the embodiment of the present disclosure, the stepped structure 23 can prevent the airflow in the air duct 21 from backflowing. Since the heat exchanger 40 is located on the air outlet side of the cross-flow fan 30, the airflow at the heat exchanger 40 has relatively large resistance. After the airflow at the end of the air duct 21 close to the heat exchanger 40 is resisted, part of the airflow will backflow along the boundary of the air duct 21, which will cause the airflow in the air duct 21 to be turbulent and the noise value to be high. The stepped structure 23 is arranged in the air duct 21 and protrudes into the air duct 21, so that the stepped structure 23 can prevent the airflow in the air duct 21 from backflowing, thereby forcing the airflow in the air duct 21 to be smooth, which can reduce the noise in the air duct 21 and thereby reduce the noise of the indoor unit. In addition, the stepped structure 23 prevents the airflow from backflowing, can also avoid the airflow in the air duct from being turbulent, stabilize the internal flow field of the airflow, and thereby ensure the air volume of the indoor unit.

[0222] Optionally, the stepped structure 23 includes one or more steps. When the stepped structure 23 includes multiple steps, the heights of the multiple steps gradually increase in the direction from the heat exchanger 40 to the cross-flow fan 30.

[0223] In the embodiment of the present disclosure, the stepped structure 23 can include one step or multiple steps. When multiple steps are arranged, the heights of the steps gradually increase in the direction away from the heat exchanger 40, so that the multiple steps can sequentially and gradually guide the airflow to form an airflow vortex, avoid the formation of violent airflow collision in the air duct 21, thereby effectively reduce the noise, avoid the surge noise caused by the airflow backflow, and ensure the smoothness of the airflow in the air duct 21 and the air outlet effect.

[0224] Optionally, the multiple steps include a first step 231, a second step 232, and a third step 233. The second step 232 is located on one side of the first step 231 toward the cross-flow fan 30. The third step 233 is located on one side of the second step 232 toward the cross-flow fan 30. The height difference between the second step 232 and the first step 231 is less than the height difference between the third step 233 and the second step 232.

[0225] In the embodiment of the present disclosure, when multiple steps are arranged, the heights of the steps gradually increase in the direction away from the heat exchanger 40, and the height difference between adjacent two steps gradually increases, so that the multiple steps can sequentially and gradually guide the airflow to form a vortex, avoid the formation of airflow collision in the air duct 21, and thereby improve the noise reduction effect of the stepped structure and the effect of stabilizing the internal flow field of the airflow.

[0226] Optionally, when the number of steps is multiple, the multiple steps extend in a stepped manner, the multiple steps include a fourth step and a fifth step, the fifth step is arranged adjacent to the fourth step, and the fifth step is located at a side of the fourth step facing the cross-flow fan 30; wherein h4 / L4≤h5 / L5, wherein h4 is the height of the fourth step protruding, L4 is the horizontal distance from the end of the fourth step away from the center of the air duct 21 to the heat exchanger 40 or the horizontal distance from the end of the fourth step away from the center of the air duct 21 to the end of the step adjacent to the side of the fourth step facing the heat exchanger 40 away from the center of the air duct 21, h5 is the height of the fifth step protruding, and L5 is the horizontal distance from the end of the fourth step away from the center of the air duct 21 to the end of the fifth step away from the center of the air duct 21.

[0227] In the embodiments of the present disclosure, the fifth step is located at the side of the fourth step close to the cross-flow fan 30, the height of the fifth step protruding is greater than the height of the fourth step, and / or the distance between the fifth step and the fourth step is less than the distance between the fourth step and the step adjacent to the side of the fourth step facing the heat exchanger 40 or the distance between the fourth step and the heat exchanger 40. In this way, along the direction away from the heat exchanger 40, the height of the steps gradually increases, which can improve the blocking effect on the backflow air flow, or along the direction away from the heat exchanger 40, the density of the steps becomes larger and larger, which can gradually improve the blocking effect on the backflow air flow, thereby avoiding the formation of violent air flow collision in the air duct 21 and reducing the noise. It should be noted that the fourth step can be any one of the first step, the second step and the third step, and the fifth step is the step adjacent to the side of any one of the first step, the second step and the third step facing the cross-flow fan.

[0228] Optionally, H / W≤1 / 3, wherein H is the sum of the heights of the multiple steps protruding, and W is the height of the normal projection of the windward surface 43 of the heat exchanger 40 along the direction from the cross-flow fan 30 to the heat exchanger 40.

[0229] In the embodiments of the present disclosure, the sum of the heights of the multiple steps protruding is less than 1 / 3 of the height of the normal projection of the windward surface 43 of the heat exchanger 40 along the direction from the cross-flow fan 30 to the heat exchanger 40, which can ensure the flow area of the air duct 21 and avoid the flow area of the air duct 21 corresponding to the steps being too small to increase the air flow resistance and affect the air volume.

[0230] Optionally, H / W and W / D are positively correlated, wherein H is the sum of the heights of the multiple steps, W is the height of the normal projection of the windward surface 43 of the heat exchanger 40 along the direction from the cross-flow fan 30 to the heat exchanger 40, and D is the height of the air duct 21 corresponding to the step closest to the cross-flow fan 30.

[0231] The greater the height of the windward surface 43 of the heat exchanger 40, the greater the resistance of the heat exchanger 40, the more backflow air flow, and the higher the height of the step, the better the blocking effect on the backflow air flow, and the better the noise reduction effect. When the size of the indoor unit is fixed or changes little, the height of the air duct 21 changes little, and the heat exchange amount is adjusted by adjusting the shape or size of the heat exchanger. When the windward surface of the heat exchanger is increased, the height of the step is also increased to improve the noise reduction effect and the effect of stabilizing the air flow field.

[0232] Optionally, the upper air duct plate includes a first connecting plate and a second connecting plate, the first connecting plate is located above the impeller 31 and extends towards the heat exchanger 40, and the second connecting plate is connected between the end of the first connecting plate towards the heat exchanger 40 and the upper end of the heat exchanger 40. Wherein, the second connecting plate is configured with a noise reduction structure, the noise reduction structure includes a step structure 23; and / or, the first connecting plate is inclined downward along the flow direction of the air flow in the air duct 21.

[0233] In the embodiment of the present disclosure, the upper air duct plate includes a first connecting plate and a second connecting plate, the first connecting plate is close to the cross-flow fan 30, and the second connecting plate is close to the heat exchanger 40. The first connecting plate is inclined downward along the flow direction of the air flow in the air duct 21, so as to avoid that the height of the second connecting plate connected with the first connecting plate is too high, so as to facilitate the second connecting plate to be provided with a noise reduction structure. The second connecting plate is located downstream of the air duct 21, where the air flow is easy to accumulate and produce noise. By providing the second connecting plate with a noise reduction structure, the noise of the entire air duct 21 can be reduced.

[0234] Optionally, the first connecting plate and the second connecting plate are detachably connected. In this way, not only the disassembly of the air duct piece 20 is facilitated, but also since the second connecting plate is provided with the step structure 23, the second connecting plate can be replaced according to the needs to adapt to different indoor units and improve the noise reduction effect.

[0235] Optionally, the air duct piece 20 includes an air duct part and a noise reduction part, the noise reduction part includes the second connecting plate, the air duct part includes the first connecting plate, the air duct part encloses the fan cavity 211 and the diffuser cavity 212, the second connecting plate encloses the fan cavity 211, and the air duct part is a one-piece structure. In this way, the installation of the air duct piece 20 is facilitated, and the air duct part will not have gaps, so that problems such as air volume loss and abnormal sound will not occur, the noise can be further reduced, and the air outlet effect can be ensured.

[0236] Optionally, the step structure 23 corresponds to the windward surface 43 of the first heat exchange section 41, and at least part of the projection of the step structure 23 is located within the projection of the first heat exchange section 41 along the height direction of the indoor unit.

[0237] In the embodiments of the present disclosure, since the first heat exchange section 41 is arranged obliquely, the length of the air duct 21 at the end of the first heat exchange section 41 close to the air outlet 12 is greater than the length of the air duct 21 at the end of the first heat exchange section 41 away from the air outlet 12, the step structure 23 corresponds to the windward surface 43 of the first heat exchange section 41, and the step structure 23 can be closer to the heat exchanger 40, thereby improving the blocking effect on the backflow air flow and improving the noise reduction effect.

[0238] Optionally, when the noise reduction structure comprises the step structure 23, the horizontal distance between the end of the step structure 23 close to the heat exchanger 40 and the windward surface 43 of the heat exchanger 40 is less than the shortest horizontal distance between the end of the step structure 23 close to the heat exchanger 40 and the outer peripheral wall of the cross-flow fan 30.

[0239] In the embodiments of the present disclosure, the step structure 23 is closer to the heat exchanger 40, since the heat exchanger 40 is located at the end of the air duct 21, the end of the air duct 21 is prone to accumulate air flow, and the air flow is prone to backflow, therefore, the end of the step structure 23 close to the heat exchanger 40 needs to be close to the heat exchanger 40, so as to improve the blocking effect on the backflow air flow and force the air flow in the air duct 21 to be smooth, thereby reducing the noise and stabilizing the air flow field.

[0240] Optionally, the end of the step structure 23 close to the heat exchanger is arranged adjacent to the heat exchanger 40, so as to prevent the air flow from backflowing to the greatest extent and reduce the noise in the air duct 21.

[0241] Optionally, as shown in Figure 10 、 Figure 13 and Figure 14 , the side wall of the air duct 21 is provided with an exhaust passage 24, the exhaust passage 24 communicates the outside of the air duct 21 and the inside of the air duct 21, and the noise reduction structure comprises the exhaust passage 24.

[0242] In the embodiments of the present disclosure, since the heat exchanger 40 has relatively large resistance, after the air flow at the end of the air duct 21 is subjected to resistance, a vortex phenomenon is formed at the position of the air outlet 12 of the air duct 21, which causes the internal flow to be turbulent, affects the air volume and also affects the noise value. The exhaust passage 24 is arranged on the side wall of the air duct 21, the exhaust passage 24 can exhaust the air flow in the air duct 21, eliminate the air flow vortex, and force the internal air flow to be smooth, thereby also reducing the noise in the air duct 21. In addition, the exhaust passage 24 can exhaust the air flow vortex in the air duct, stabilize the internal flow field of the air flow, and further ensure the air volume of the indoor unit.

[0243] Optionally, at least one of the left side wall and the right side wall of the air duct 21 is provided with the exhaust passage 24, and the distance between the center of the exhaust passage 24 and the heat exchanger 40 is less than the distance between the center of the exhaust passage 24 and the cross-flow fan 30.

[0244] In this embodiment, the heat exchanger 40 is located at the end of the air duct 21. Therefore, the airflow resistance is greater in the air duct 21 near the heat exchanger 40, and more vortices are formed. The exhaust channel 24 is located closer to the heat exchanger 40, which can better discharge the vortices in the air duct 21, force the airflow in the air duct 21 to be smooth, reduce the noise in the air duct 21 and stabilize the airflow field.

[0245] Optionally, the exhaust passage 24 includes an exhaust grille 241, which is elongated and located on the upper and lower sides of the centerline of the air duct 21 at both ends in the height direction.

[0246] In this embodiment, the exhaust channel 24 is grid-shaped, with the opening area of ​​the grid being larger than that of the perforated opening. This reduces the airflow resistance of the exhaust grid 241, improves the exhaust effect and volume, effectively reduces vortices within the air duct 21, and lowers noise. The exhaust grid 241 extends along the height direction of the air duct 21, with its two ends located on the upper and lower sides of the centerline of the air duct 21, thereby increasing the exhaust area in the height direction of the air duct 21, improving noise reduction and flow field stabilization.

[0247] Optionally, the exhaust passage 24 includes one or more exhaust grilles 241 arranged side by side, the exhaust grilles 241 being inclined and having an angle with the horizontal direction.

[0248] In this embodiment, the number of exhaust grilles 241 can vary depending on the air duct 21. The exhaust grilles 241 are inclined, which further increases their exhaust area, improves exhaust efficiency and speed, and enhances noise reduction and flow field stability. Furthermore, the exhaust grilles 241 can be inclined along the airflow direction within the air duct 21, further improving airflow discharge. Optionally, in practical applications, the exhaust grilles 241 can be inclined upwards or downwards along the airflow direction within the air duct. The inclination direction of the exhaust grilles 241 can be adjusted according to the heat exchanger settings during actual use. Preferably, the inclination direction of the first heat exchange section and the exhaust grilles is the same along the airflow direction within the air duct.

[0249] Optionally, such as Figure 17 As shown, when the exhaust grille 241 is inclined, the angle between the exhaust grille 241 and the horizontal direction is in the range of 50°≤a≤90°. When the angle between the exhaust grille 241 and the horizontal direction is less than 50°, the area of ​​the exhaust grille 241 along the airflow direction in the air duct 21 is large, which will lead to serious air leakage in the air duct 21 and affect the air volume. For example, the angle between the exhaust grille 241 and the horizontal direction is 50°, 55°, 60°, 65°, 70°, 75°, 80°, 85°, 90°, etc.

[0250] Preferably, the exhaust grille is arranged parallel to the heat exchanger. This way, the vortex formed by the airflow towards the heat exchanger within the duct corresponds to the structure of the heat exchanger, and the parallel arrangement of the exhaust grille allows for the removal of more of the vortex within the duct.

[0251] Optionally, such as Figure 14 As shown, a first return air passage 292 is defined between the housing and the air duct component 20, the first return air passage 292 connecting the exhaust passage 24 and the air inlet 11, so that the airflow of the exhaust passage 24 can flow through the first return air passage to the air inlet 11; and / or, the air duct component 20 defines a second return air passage 293, the second return air passage 293 connecting the exhaust passage 24 and the air inlet 11, so that the airflow of the exhaust passage 24 can flow through the second return air passage to the air inlet 11. Figure 14 The middle arrow indicates the direction of airflow in the first and second return air channels.

[0252] In this embodiment, the exhaust airflow from the exhaust channel 24 flows back to the air inlet 11 through the first return air channel and / or the second return air channel. Here, both the first and second return air channels are located inside the casing. That is to say, the airflow in the air duct 21 exiting the exhaust channel 24 will not flow into the environment outside the casing, but will return to the air inlet inside the casing for recirculation. Since the indoor unit is located inside the ceiling, the space inside the ceiling is relatively enclosed. The airflow from the exhaust channel 24 will not be discharged to the outside of the indoor unit, that is, it will not enter the ceiling, will not affect the pressure inside the ceiling, and will not cause airflow turbulence inside the ceiling that would cause dust to fly. The dust inside the ceiling will also not enter the air duct 21 through the exhaust channel 24, thus preventing dust from entering the air duct 21 and affecting the operation of the fan, thereby ensuring the normal operation of the indoor unit.

[0253] Optionally, when the first return air passage is defined between the housing and the air duct component 20, the housing includes a side plate 14, which is located outside the left side wall and / or the right side wall of the air duct 21, and the side plate 14 and the left side wall and / or the right side wall of the air duct 21 enclose the first return air passage.

[0254] In this embodiment, the side plate 14 and the left side wall of the air duct component 20 and / or the right side wall of the air duct 21 can directly enclose the first return air channel, so that the side plate 14 can prevent the airflow from the exhaust channel 24 from flowing to the outside of the casing.

[0255] Optionally, when the air duct component 20 defines the second return air passage, the air duct component 20 includes an air duct component body and an air duct side plate 29. The air duct component body defines the air passage 21. The air duct side plate 29 is connected to the air duct component body and is located outside the exhaust passage 24. The air duct side plate 29 and the air duct component body enclose the second return air passage.

[0256] In the embodiment of the present disclosure, the air duct piece 20 can also define a second return air passage, and the air duct side plate 29 is located outside the exhaust passage 24, so that when there are other components between the air duct piece 20 and the side plate 14, the air duct side plate 29 can prevent the air flow of the exhaust passage 24 from flowing to the other components, and can ensure that the air flow discharged by the exhaust passage 24 can flow to the air inlet 11 through the second return air passage.

[0257] Optionally, the refrigerant pipe 54 connected with the heat exchanger 40 is located on the side of the air duct side plate 29 away from the air duct body, so that the air duct side plate 29 can prevent the air flow of the exhaust passage 24 from exchanging heat with the refrigerant pipe 54, prevent the temperature change of the refrigerant medium of the refrigerant pipe 54, and affect the normal work of the indoor unit.

[0258] Optionally, the area of the exhaust passage 24 corresponding to the heat exchange cavity 213 is greater than the area of the exhaust passage 24 corresponding to the diffuser cavity 212.

[0259] In the embodiment of the present disclosure, the heat exchange cavity 213 is located at the end of the air duct 21, and the area of the exhaust passage 24 of the heat exchange cavity 213 is greater than the area of the exhaust passage 24 of the diffuser cavity 212, so that the exhaust effect of the heat exchange cavity 213 can be improved, and the noise reduction effect is ensured.

[0260] Optionally, the air duct piece 20 includes side air duct plates, two side air duct plates are located on the left and right sides of the air duct 21, the left side wall of the air duct includes a left side air duct plate, and the right side wall of the air duct includes a right side air duct plate, wherein the side air duct plate is configured with a noise reduction structure, and the noise reduction structure includes the exhaust passage 24.

[0261] Optionally, as shown in Figure 6 The air duct 21 is also provided with a flow guide rib 80, the flow guide rib 80 is arranged on the inner wall surface of the air duct 21, and the flow guide rib 80 includes a first flow guide rib 81, the number of the first flow guide rib 81 is one or more, and at least one first flow guide rib 81 is located at the middle part of the length direction of the air duct. In this way, when the air in the air duct 21 flows to the first flow guide rib 81, the first flow guide rib 81 can straighten the air, so that the air flow in the air duct 21 is distributed approximately uniformly along the length direction of the air duct, so that the eccentric vortex position is relatively stable, the eccentric vortex is prevented from moving, air return is avoided, and noise is reduced. Moreover, the first flow guide rib 81 is arranged in this way, which has low cost and is easy to implement. Figures 19 to 21 The arrow in the middle indicates the length direction of the air duct 21.

[0262] Optionally, the first guide ribs 81 are multiple, and the multiple first guide ribs 81 are sequentially arranged along the length direction of the air duct 21, so that the first guide ribs 81 are more evenly distributed along the length direction of the air duct 21, and the rectification effect is better. Among them, the multiple first guide ribs 81 are respectively located on the opposite sides of the at least one first guide rib 81 and / or the distance between adjacent two first guide ribs 81 is greater than or equal to 30mm and less than or equal to 120mm. Here, the distance between the adjacent two first guide ribs 81 is less than 30mm, which is too dense and increases the air flow resistance, and the distance between the adjacent two first guide ribs 81 is greater than 120mm, which reduces the rectification effect.

[0263] Optionally, the guide rib 80 extends along the flow direction of the air flow in the air duct 21. It is convenient to guide the air flow and realize rectification.

[0264] Optionally, the guide rib 80 comprises a first end portion and a second end portion sequentially arranged along the flow direction of the air flow, and along the flow direction of the air flow in the air duct 21, the first end portion is inclined towards the direction close to the center of the air duct 21 and / or the second end portion is inclined towards the direction away from the center of the air duct 21. In order to reduce the resistance of the end portion of the guide rib 80 to the air flow.

[0265] Optionally, the inner wall surface of the upper air duct plate and / or the inner wall surface of the lower air duct plate 263 is provided with the first guide rib 81. In this way, the upper and lower directions of the air duct 21 can rectify the air flow.

[0266] Optionally, the first guide rib 81 of the inner wall surface of the upper air duct plate and the first guide rib 81 of the inner wall surface of the lower air duct plate 263 are staggered, which further improves the rectification effect.

[0267] Optionally, the guide rib 80 further comprises a second guide rib 82, and the inner wall surface of the left side wall of the air duct 21 and / or the inner wall surface of the right side wall of the air duct 21 is provided with the second guide rib 82. In this way, the left and right directions of the air duct 21 can also rectify the air flow.

[0268] Optionally, the second guide rib 82 is arranged on the wall surface of the exhaust grille 241 facing the air duct 21, and the second guide rib 82 is connected between the multiple exhaust grilles 241. In this way, the second guide rib 82 can not only play a rectification role, but also improve the strength of the exhaust grille 241, thereby ensuring the strength of the air duct piece 20.

[0269] Optionally, as shown in Figures 19 to 21 The volute tongue 27 comprises a first segment 273 and a second segment 274, and the first segment 273 and the second segment 274 are sequentially arranged along the flow direction of the air flow in the air duct 21, and the connection between the first segment 273 and the second segment 274 forms a bending towards the axis of the air duct 21, wherein the volute tongue 27 is detachably connected with the air duct piece. In this way, the production and processing of the air duct piece 20 are facilitated, and the cost is reduced.

[0270] Optionally, the volute tongue 27 is clamped with the air duct member, facilitating operation.

[0271] Optionally, the second section 274 of the volute tongue 27 is provided with a pressure relief hole 271. When the second section 274 is provided with the pressure relief hole 271, the higher pressure vortex flow in the air duct 21 can be discharged through the pressure relief hole 271, achieving pressure relief, so that the airflow in the entire air duct 21 becomes relatively smooth, the position of the eccentric vortex becomes relatively stable, the turbulence is reduced, and thus the noise is reduced.

[0272] The first section 273 is not provided with the pressure relief hole 271, and the pressure relief hole 271 is arranged on the second section 274. The pressure relief hole 271 can not only achieve pressure relief, but also avoid affecting the air outlet volume of the indoor unit due to the air in the air duct 21 being discharged through the first section 273.

[0273] Optionally, the distance between the pressure relief hole 271 and the bending portion is greater than or equal to 5 mm and less than or equal to 15 mm. If the distance between the pressure relief hole 271 and the bending portion is less than 5 mm, the distance is too far from the heat exchanger 40, and the pressure relief effect is not obvious. If the distance between the pressure relief hole 271 and the bending portion is greater than 15 mm, in the case of a certain size of the volute tongue 27, the area where the pressure relief hole 271 can be arranged on the second section 274 is limited, and the total area of the pressure relief hole 271 cannot meet the requirement.

[0274] Optionally, the second section 274 includes a pressure relief area and a non-pressure relief area, and the pressure relief area and the non-pressure relief area are sequentially and spacedly arranged along the length direction of the volute tongue 27. The pressure relief hole 271 is arranged in the pressure relief area. When the airflow in the air duct 21 impacts the volute tongue 27, the airflow reaches the pressure relief area and the non-pressure relief area at different times, effectively avoiding the resonance peak value caused by the superposition of the same frequency section pulsation, thereby reducing the noise value.

[0275] Optionally, a plurality of pressure relief holes 271 are arranged in each pressure relief area, and at least two pressure relief holes 271 are sequentially arranged along the length direction of the volute tongue 27 and / or at least two pressure relief holes 271 are sequentially arranged along the flow direction of the airflow in the air duct 21.

[0276] Optionally, the volute tongue 27 is arranged on the upper wall surface of the lower air duct plate 263, and the lower air duct plate 263 is provided with a pressure relief channel 272 communicating with the pressure relief hole 271. In this way, the airflow in the air duct 21 can flow out more smoothly.

[0277] Optionally, the volute tongue 27 is provided with a clamping hook 275, and the clamping hook 275 is clamped with the pressure relief channel 272. In this way, the pressure relief channel 272 can not only realize the detachability of the volute tongue 27, but also facilitate pressure relief.

[0278] Optionally, the volute tongue 27 and the lower air duct plate 263 define a sound absorption cavity 276, and the sound absorption cavity 276 communicates with the pressure relief hole 271. In this way, the pressure relief hole 271 can not only relieve pressure, but also form a Helmholtz resonance sound absorption cavity 276 with the sound absorption cavity 276.

[0279] Here, the sound absorbing cavity 276 is a closed structure, when the frequency of the incident sound wave in the sound absorbing cavity 276 approaches the natural frequency of the resonator formed by the sound absorbing cavity 276 and the pressure relief hole 271, the air column at the pressure relief hole 271 produces strong vibration, in the process of vibration, the sound energy is consumed due to overcoming the friction resistance, thereby realizing sound absorption.

[0280] The embodiments of the present disclosure further provide an air conditioner, which comprises the air conditioner indoor unit according to any one of the above embodiments.

[0281] The air conditioner provided by the embodiments of the present disclosure has the beneficial effects of any one of the above embodiments due to comprising the air conditioner indoor unit according to any one of the above embodiments, and details are not described herein again.

[0282] The air conditioner further comprises an outdoor unit, which is in communication with the indoor unit through a refrigerant pipe and forms a refrigerant circulation loop. Alternatively, the indoor unit can be a ducted-type air conditioner or other forms of air conditioner.

[0283] The above description and drawings sufficiently show the embodiments of the present disclosure to enable a person skilled in the art to practice them. Other embodiments can include structural and other changes. The embodiments only represent possible variations. Unless explicitly required, individual components and functions are optional, and the order of operations can be changed. Some parts and features of some embodiments can be included in or replace parts and features of other embodiments. The embodiments of the present disclosure are not limited to the structures that have been described above and shown in the drawings, and various modifications and changes can be made without departing from the scope thereof. The scope of the present disclosure is only limited by the appended claims.

Claims

1. An air conditioner indoor unit characterized by comprising: The air conditioner indoor unit comprises: a shell, an air duct is formed inside the shell; a heat exchanger is located in the air duct; an axial flow fan, along the flow direction of the airflow in the air duct, the axial flow fan and the heat exchanger are sequentially arranged in the air duct; wherein the heat exchanger comprises a first heat exchange section, the first heat exchange section is in a straight plate type, and the first heat exchange section is inclined upward or downward along the flow direction of the airflow in the air duct.

2. The air conditioner indoor unit according to claim 1, wherein an included angle between the windward surface of the first heat exchange section and the lower wall surface of the air duct is 60°≤γ≤120°.

3. The air conditioner indoor unit according to claim 1, wherein the air duct comprises a fan cavity, a diffuser cavity and a heat exchange cavity, the axial flow fan is located in the fan cavity, the heat exchanger is located in the heat exchange cavity, and along the flow direction of the airflow in the diffuser cavity, the distance between the upper wall surface of the diffuser cavity and the lower wall surface of the diffuser cavity gradually increases.

4. The air conditioner indoor unit according to claim 3, wherein the upper wall surface of the diffuser cavity is inclined downward along the flow direction of the airflow in the air duct, and the included angle between the upper wall surface of the diffuser cavity and the horizontal direction is 5°≤α≤15°; and / or the lower wall surface of the diffuser cavity is inclined downward along the flow direction of the airflow in the air duct, and the included angle between the lower wall surface of the diffuser cavity and the horizontal direction is 25°≤β≤35°.

5. The air conditioner indoor unit according to claim 3, wherein the center of the starting end of the diffuser cavity is located above the center line in the height direction of the air conditioner indoor unit; or the center of the starting end of the diffuser cavity is located above the separation line of three-quarters of the height of the air conditioner indoor unit.

6. The air conditioner indoor unit according to claim 3, wherein the minimum distance from the starting end of the diffuser cavity to the windward surface of the first heat exchange section is greater than the length of the air inlet duct on the air inlet side of the axial flow fan.

7. The air conditioner indoor unit according to claim 1, wherein the heat exchanger as a whole is in a straight plate type, or the heat exchanger further comprises: a second heat exchange section, the second heat exchange section is connected with the first heat exchange section, and an included angle is formed at the connection between the second heat exchange section and the first heat exchange section.

8. The air conditioner indoor unit according to claim 1, wherein the ratio of the distance H1 between the center of the impeller of the axial flow fan and the bottom of the air conditioner indoor unit to the height M of the air conditioner indoor unit is H1 / M≤0.45; and / or H1-R≥10mm, wherein H1 is the distance between the center of the impeller of the axial flow fan and the bottom of the air conditioner indoor unit, and R is the radius of the impeller of the axial flow fan.

9. The air conditioner indoor unit according to any one of claims 1 to 8, wherein the front side of the bottom wall of the shell is provided with an air inlet, the axial flow fan corresponds to the air inlet, the rear wall of the shell is provided with an air outlet, and the heat exchanger corresponds to the air outlet; and / or further comprising: a volute tongue, which is arranged on the lower wall surface of the air duct and corresponds to the axial flow fan; wherein the highest point of the volute tongue is located above the center line in the height direction of the air conditioner indoor unit.

10. An air conditioner characterized by comprising: The air conditioner indoor unit comprises the air conditioner indoor unit according to any one of claims 1 to 9.

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