Indoor unit and air conditioner

Abstract

The utility model relates to the technical field of air conditioning, and discloses an indoor unit and an air conditioner. The indoor unit comprises a machine shell, an air inlet and an air outlet, wherein a containing cavity with the air inlet and the air outlet is defined; the heat exchanger is located in the containing cavity; the cross-flow fan and the heat exchanger are sequentially arranged in the containing cavity in the direction from the air inlet to the air outlet; the air duct piece is located in the containing cavity, an air duct is defined by the air duct piece, and the air duct communicates between the cross-flow fan and the heat exchanger; wherein a noise reduction structure is constructed in the air duct. The air channel is communicated with the impeller and the heat exchanger, and a noise reduction structure is constructed in the air channel, so that noise in the air channel can be reduced, noise generated when the duct type air conditioner works is reduced, and the use experience of a user is improved.

Description

TECHNICAL FIELD

[0001] The present application relates to the air conditioning technical field, for example, relates to an 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, so the height required by the air inlet space is high, resulting in that the thickness of the air conditioner indoor unit is large.

[0003] Therefore, a blowing type indoor unit is disclosed in the related art, that is, the airflow flows through the cross-flow 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.

[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] The blowing type indoor unit in the related art has the heat exchanger located at the air outlet side of the cross-flow fan, the resistance of the heat exchanger to the airflow is increased, the airflow in the air duct is affected by the resistance and forms a backflow vortex, thereby causing the airflow inside the air duct to flow smoothly and disorderly, generating noise value, and affecting the user 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 CONTENTS

[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 components 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 indoor unit and an air conditioner to reduce the working noise of the blowing type indoor unit and improve the user experience.

[0009] The embodiments of the present disclosure provide an indoor unit, which comprises: a shell defining an accommodating cavity with an air inlet and an air outlet; a heat exchanger located in the accommodating cavity; a cross-flow fan, which is arranged in the accommodating cavity in sequence along the direction from the air inlet to the air outlet; and an air duct member located in the accommodating cavity, the air duct member defining an air duct, the air duct being communicated between the cross-flow fan and the heat exchanger; wherein a noise reduction structure is constructed in the air duct.

[0010] The embodiments of the present disclosure also provide an air conditioner, which comprises the indoor unit according to any one of the above embodiments.

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

[0012] The 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, the air inlet side of the cross-flow fan has small resistance, the length of the air duct at the air inlet side can be reduced, the air outlet path of the air outlet duct of the cross-flow fan is increased, so that the space for air outlet is increased, the height of the air duct connected between the cross-flow fan and the heat exchanger can be appropriately reduced, and the thickness of the entire indoor unit is further reduced. The air duct connects the impeller and the heat exchanger, and the noise reduction structure is arranged in the air duct, so that the noise caused by the backflow of airflow in the air duct can be reduced, the noise of the indoor unit during operation is further reduced, and the user experience is improved. Moreover, the air duct piece is located in the cabinet, so that the air duct piece can be protected, the air duct piece is prevented from being damaged during transportation and installation, air leakage in the air duct is avoided, and the service life of the indoor unit is improved.

[0013] In addition, the general description above and the following description below are exemplary and explanatory only and are not intended to be limiting. BRIEF DESCRIPTION OF DRAWINGS

[0014] One or more embodiments are illustrated by way of example with reference to the accompanying drawings, which are schematic and are not intended to be limiting of the embodiments, in which like reference numerals refer to like elements in the various figures of the drawings, the drawings are not intended to be to scale and in which:

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

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

[0035] Figure 21 is a structural schematic diagram of a volute tongue provided by an embodiment of the present disclosure;

[0036] Figure 22-1 is a simulation structural schematic diagram of an indoor unit provided by an embodiment of the present disclosure;

[0037] Figure 22-2 is a simulation structural schematic diagram of another indoor unit provided by an embodiment of the present disclosure;

[0038] Figure 23-1 is another simulation structure schematic diagram of an indoor unit provided by the embodiment of the present disclosure;

[0039] Figure 23-2 is another simulation structure schematic diagram of an indoor unit provided by the embodiment of the present disclosure.

[0040] Reference signs:

[0041] 10, housing; 11, air inlet; 12, air outlet; 13, accommodating cavity; 14, side plate; 141, outlet; 20, air duct piece; 21, air duct; 211, fan cavity; 212, pressure expansion cavity; 2121, upper wall surface of the pressure expansion cavity; 2122, lower wall surface of the pressure expansion cavity; 213, heat exchange cavity; 22, air suction air duct; 23, step 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 the 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, drain 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

[0042] In order to enable one skilled in the art to more fully understand the features and technical content of the embodiments of the present disclosure, the implementation of the embodiments of the present disclosure is described in detail below with reference to the accompanying drawings, which are only used for reference and do not limit the embodiments of the present disclosure. In the following technical description, in order to facilitate explanation, through multiple details, a sufficient understanding of the disclosed embodiments is provided. However, one or more embodiments can still be implemented without these details. In other cases, in order to simplify the drawings, well-known structures and devices can be simplified.

[0043] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this disclosure are used to distinguish similar objects and are not necessarily used to describe a specific order or sequence. It should be understood that such data can be interchanged where appropriate for describing embodiments of this disclosure herein. Furthermore, the terms "comprising" and "having," and any variations thereof, are intended to cover non-exclusive inclusion.

[0044] 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.

[0045] 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.

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

[0047] 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.

[0048] It should be noted that, unless otherwise specified, the embodiments and features described in the present disclosure can be combined with each other.

[0049] 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.

[0050] Combination Figures 1 to 21 As shown, this disclosure provides an indoor unit, such as...Figure 10 As shown, the indoor unit comprises 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 comprises a cross-flow fan 30 and a heat exchanger 40, the cross-flow fan 30 comprises 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.

[0051] In the embodiments 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, 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.

[0052] 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.

[0053] 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 included angle, and the included 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.

[0054] 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 into the indoor through the air outlet and the exhaust air outlet in sequence after the heat exchanger.

[0055] 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, 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, which improves the overhauling convenience of the cross-flow fan 30 and improves the overhauling convenience of the indoor unit.

[0056] 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.

[0057] 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.

[0058] 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.

[0059] 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.

[0060] 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°.

[0061] 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.

[0062] Optionally, 60°≤γ≤90°, or 60°≤γ≤80°.

[0063] For example, γ is 60°, 65°, 70°, 75°, 80°, 85°, 90°, 100°, 110°, or 120°, etc.

[0064] 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.

[0065] 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, so that the air flow speed at the center of the air outlet cavity can be reduced, the flow speed difference between the center of the air duct 21 and the periphery of the air duct 21 is reduced, the noise is reduced, and the flow speed is reduced, so that the heat exchange efficiency of the air flow and the heat exchanger 40 can be improved.

[0066] 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 flow speed difference between the air flow at the periphery of the air outlet cavity and the air flow at the center of the air outlet cavity is reduced, the noise is reduced, and the flow speed of the air flow is slowed down, so that the air flow can be more fully exchanged with the heat exchanger 40 to ensure the heat exchange area.

[0067] Optionally, the heat exchanger is arranged at the outlet end of the air outlet cavity to ensure the air outlet distance of the air outlet cavity.

[0068] 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 flow speed difference between the air flow at the periphery of the air duct 21 and the air flow at the center of the air duct 21 is reduced, the noise is reduced, and the flow speed of the air flow is slowed down, so that the air flow can be more fully exchanged with the heat exchanger 40 to ensure the heat exchange area.

[0069] Optionally, the height of the heat exchange cavity 213 is greater than the height of the diffuser cavity 212. In this way, the air duct 21 can be matched with the heat exchanger 40 and communicate with each other, so that the airflow in the air duct 21 can flow through the heat exchanger 40 completely. Moreover, the airflow passing area in the heat exchange cavity increases further as it is closer to the heat exchanger 40, which can avoid the formation of more vortexes due to large airflow resistance, reduce the number of vortexes, reduce the airflow return amount, reduce the noise, and reduce the airflow velocity so that the airflow in the heat exchange cavity can be fully exchanged with the heat exchanger.

[0070] 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°.

[0071] 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, which can guide the airflow discharged by the cross-flow fan 30 to flow into the heat exchanger 40 better. Moreover, the airflow has a downward movement tendency under its own gravity when it is inclined downward, which reduces 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, which has a small guiding effect on the airflow. 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 steep, part of the airflow to flow fast, affect the airflow in the air duct 21, and cause 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 passing area of the air duct 21, the height of the air duct 21 will also increase, 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 on the airflow, but also reduce the loss of the airflow, and reduce the thickness of the indoor unit.

[0072] 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°.

[0073] For example, the angle 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.

[0074] 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°.

[0075] 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.

[0076] 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°.

[0077] 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.

[0078] 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.

[0079] In the embodiments of the present disclosure, the diffuser chamber 212 is arranged close to 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 are more compact, and avoid increasing the thickness of the indoor unit.

[0080] 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.

[0081] 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.

[0082] 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 air suction duct 22 on the air 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, and the air volume can be ensured. Moreover, since the air inlet 11 is located on the bottom wall of the shell, the length of the air suction duct 22 is relatively short, so that the thickness of the indoor unit is not increased, and the "ultra-thin" size of the indoor unit is ensured.

[0083] 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.

[0084] In the embodiment of the present disclosure, the volute tongue 27 corresponds to the cross-flow fan 30, 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.

[0085] In some optional embodiments, the heat exchanger 40 is a straight plate type as a whole.

[0086] 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.

[0087] 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.

[0088] 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.

[0089] Optionally, the included angle between the first heat exchange section 41 and the second heat exchange section 42 is opened towards the cross-flow fan 30, so as to further increase the heat exchange area and improve the heat exchange amount.

[0090] 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. 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.

[0091] 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.

[0092] Optionally, as shown in Figure 17As shown, 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 and the height M of the whole indoor unit is H1 / M≤0.45. The center of the impeller 31 of the cross-flow fan 30 is arranged lower, so that the length of the air suction duct 22 can be reduced, and the thickness of the indoor unit can be reduced.

[0093] Optionally, H1 / M≤0.4, or H1 / M≤0.35, or H1 / M≤0.3.

[0094] For example, H1 / M is 0.1, 0.15, 0.2, 0.25, 0.3, 0.35, 0.4, 0.45, etc.

[0095] 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. In this way, the length of the air suction duct 22 can be prevented from being too short, and the air inlet amount and air inlet effect of the indoor unit can be ensured.

[0096] 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 a 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.

[0097] In the embodiment 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 provided with pipe passing openings 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. The universality is improved without producing two mirror image models. The connecting pipe does not need to be wound outside the indoor unit, and the pipe assembly 50 will not be bent, so 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, the pipe assembly 50 will not interfere with other components, and the disassembly and assembly of other components will not be affected.

[0098] 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.

[0099] Optionally, the outer wall surface of the pipeline assembly 50 is in abutment with the bottom wall of the air duct member. In this way, the pipeline assembly 50 is as close as possible to the air duct member 20, avoiding the pipeline assembly 50 from increasing the thickness of the indoor unit, and also avoiding the pipeline assembly 50 from protruding too much from the indoor unit, which may be damaged or affect the airflow.

[0100] Optionally, as shown in Figure 10 the housing includes a casing 10 and an air duct member 20, the casing 10 defines a receiving cavity 13 having an air inlet 11 and an air outlet 12, the cross-flow fan 30 and the heat exchanger 40 are arranged in the receiving cavity in sequence in the direction from the air inlet 11 to the air outlet 12, and the air duct member 20 is located in the receiving cavity 13, the air duct member 20 defines an air duct 21, and the air duct 21 is communicated between the cross-flow fan 30 and the heat exchanger 40. Here, the casing 10 is sleeved on the outer side of the air duct member 20, the air duct 21 is defined inside the air duct member 20, the inlet of the air duct 21 is located in the receiving cavity and communicated with the air inlet 11, and the outlet of the air duct 21 is located in the receiving cavity and communicated with the air outlet 12, so that the casing can be used to place other components outside the air duct member 20. In addition, the casing can protect the air duct member 20, avoiding the air duct member 20 from being damaged by the external environment, resulting in air leakage and other situations.

[0101] Optionally, the casing includes two side plates, and the pipeline space extends in the length direction of the indoor unit, and the two side plates are connected on both sides of the length direction of the indoor unit, that is, on both ends of the indoor unit, thereby realizing the left and right pipe connection of the indoor unit.

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

[0103] Optionally, as shown in Figure 10 the top wall of the casing is located on the outer side of the top wall 26 of the air duct member to protect the top wall 26 of the air duct member, and / or the bottom wall of the casing is located on the outer side of the bottom wall of the air duct member to protect the bottom wall of the air duct member.

[0104] Optionally, the left and right side walls (that is, the two side plates 14) of the casing are respectively located on the outer side of the left and right side walls of the air duct member 20 to protect the left and right side walls of the air duct member 20.

[0105] Optionally, the top wall of the casing is in abutment (abutment or close) with the top wall 26 of the air duct member. In this way, the casing can increase the strength of the top wall of the air duct member 20 and the top wall of the casing, avoiding the damage of the air duct member 20.

[0106] Optionally, the two side plates of the shell 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 shell and the right end of the bottom wall of the shell, the left side plate is connected between the left end of the top wall of the shell and the left end of the bottom wall of the shell, the rear side wall of the shell is connected between the rear end of the top wall of the shell, the rear end of the bottom wall of the shell, the rear end of the left side plate and the rear end of the right side plate, and the rear side wall of the shell is provided with the air outlet 12, and the bottom wall of the shell is provided with the air inlet 11.

[0107] Optionally, the shell further includes a front side wall of the shell, the front side wall of the shell is connected between the front end of the top wall of the shell, the front end of the bottom wall of the shell, the front end of the left side plate and the front end of the right side plate.

[0108] Optionally, as shown in Figure 10 , 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 for collecting the condensed water of the heat exchanger 40. One end of the water collecting tray 67 is connected with 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.

[0109] Optionally, the bottom wall of the shell is located below the water collecting tray 67, one end of the bottom wall of the shell is connected with one end of the bottom wall of the air duct piece, and the other end of the bottom wall of the shell forms the air outlet 12.

[0110] Optionally, the bottom wall of the air duct piece is detachably connected with the bottom wall of the shell, so that the air duct piece 20 and the shell are convenient to disassemble and assemble.

[0111] Optionally, the bottom wall of the air duct piece is connected with the bottom wall of the shell through screws or buckles 35.

[0112] Optionally, one end of the bottom wall of the air duct piece is detachably connected with the water collecting tray 67, so that the water collecting tray 67 is convenient to disassemble and assemble.

[0113] Optionally, one end of the bottom wall of the air duct piece is buckled with the water collecting tray 67.

[0114] 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 collecting tray 67, so that one end of the water collecting tray 67 can be buckled with the clamping groove.

[0115] 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.

[0116] Optionally, as shown in Figure 1 , Figure 2 and Figure 8As shown, the casing includes two spaced and opposite side plates 14, and the side plates 14 are provided with pipe outlets 141. Alternatively, the two side plates 14 are respectively located at the left side and the right side of the indoor unit, so that the pipe assembly 50 can extend from the left side or the right side of the indoor unit, and the side plates belong to the casing and can protect the air duct member from the outside of the air duct member.

[0117] Alternatively, as shown in Figure 1 As shown, the bottom wall of the air duct member is concave towards the air duct 21 to form a recess 251, and the pipe assembly 50 is located in the recess 251. In the embodiment of the present disclosure, the bottom wall of the air duct member forms the recess 251, and the recess 251 is provided to avoid more space for installing the pipe assembly 50 and reduce the height of the pipe assembly 50, so that the pipe assembly 50 does not increase the thickness of the indoor unit.

[0118] Alternatively, the pipe running space 25 is located between the diffuser chamber 212 and the fan chamber 211.

[0119] In the embodiment of the present disclosure, the height of the diffuser chamber 212 is greater than the height of the fan chamber 211, so that there is a recess 251 at the connection between the diffuser chamber 212 and the fan chamber 211, and the pipe assembly 50 can be placed in the recess 251 formed at the connection between the diffuser chamber 212 and the fan chamber 211, so that the pipe assembly 50 is convenient to set and the diffuser chamber 212 is convenient to form.

[0120] Alternatively, as shown in Figure 9 and Figure 14 As shown, the pipe assembly 50 includes a refrigerant pipe 54, the refrigerant pipe 54 includes a first pipe 51, a second pipe 52 and a conversion joint 53, one end of the first pipe 51 is in communication with the heat exchanger 40; one end of the second pipe 52 is in communication with the other end of the first pipe 51, and at least part of the second pipe 52 is located in the pipe running space 25; the conversion joint 53 is connected between the other end of the first pipe 51 and one end of the second pipe 52 to adjust the angle between the first pipe 51 and the second pipe 52, so that the second pipe 52 can extend to the outside of the pipe running space 25 through any one of the two pipe outlets 141.

[0121] In the embodiment of the present disclosure, the refrigerant pipe is used to realize the inlet and outlet of the heat exchanger 40, the second pipe 52 is connected with the first pipe 51 through the conversion joint 53, and the conversion joint 53 can rotate, so that the second pipe 52 can rotate through the conversion joint 53 to adjust the relative position of the second pipe 52 and the first pipe 51, so that the second pipe 52 can extend from 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 pipe 52 with the outdoor unit.

[0122] Optionally, the side plate 14 and the end of the heat exchanger 40 enclose a mounting space; wherein at least part of the first pipe 51 is located in the mounting space, and the first pipe 51 extends along the width direction of the indoor unit, and the second pipe 52 extends along the length direction of the indoor unit. In this way, the second pipe 52 can be extended out of the outlet pipe 141 on the left side of the indoor unit or the outlet pipe 141 on the right side of the indoor unit through the conversion joint 53.

[0123] For example, when the second pipe 52 is extended out of the outlet pipe 141 on the left side, the second pipe is located on the left side of the first pipe. When the first pipe 51 is extended out of the outlet pipe 141 on the right side, the second pipe is located on the right side of the first pipe.

[0124] Optionally, the conversion joint 53 is L-shaped.

[0125] Optionally, the other end of the second pipe 52 is adapted to communicate with one end of a connecting pipe, and the other end of the connecting pipe communicates with the compressor of the outdoor unit and / or the outdoor heat exchanger to form a refrigerant circulation loop.

[0126] 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 the first pipes 51 communicates with the inlet of the heat exchanger 40, and the other of the first pipes 51 communicates with the outlet of the heat exchanger 40, so that the heat exchanger 40 realizes the inlet and outlet from the same side, which is convenient for 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 one by one, so that one of the second pipes 52 communicates with one of the first pipes 51 to form an inlet pipe, and the other of the second pipes 52 and the other of the first pipes 51 communicate 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.

[0127] Optionally, the two first pipes 51 are arranged side by side and spaced apart along the length direction of the indoor unit.

[0128] 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 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 pipe 52.

[0129] Optionally, the pipe assembly 50 further comprises a heat preservation pipe, which is sleeved outside the first pipe 51 and the second pipe 52.

[0130] Optionally, a notch is formed at the lower end of the outlet pipe 141. In this way, the lower end of the outlet pipe 141 is not closed, which is convenient for the pipe to be taken out of or put into the outlet pipe 141, and further improves the disassembly and assembly convenience of the pipe assembly 50.

[0131] Optionally, the water pan 67 is provided with a water outlet 69, the water pan 67 abuts against the side plate 14, the side plate 14 is provided with a water outlet gap, and the water outlet 69 communicates with the outside through the water outlet gap. 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 a water outlet gap, so that the water outlet 69 of the water pan 67 can discharge water to the outside through the water outlet gap, so that the water in the water pan 67 can be discharged to the outside of the indoor unit.

[0132] In some optional embodiments, the water pan 67 is provided with a water outlet 69 at each of the left end and the right end, and the water outlet 69 is adapted to communicate with the first drain pipe. In the embodiments of the present disclosure, the indoor unit can selectively connect the first drain pipe to the left side of the water pan 67 or the right side of the water pan 67 according to the installation position, and the other end of the first drain pipe communicates with the outside, so that the water in the water pan 67 is discharged to the outside through the first drain pipe.

[0133] Optionally, the indoor unit further comprises a water pump 60, the water pump 60 communicates with the water pan 67, and the water pump 60 is used to pump out the water in the water pan 67. The pipeline assembly 50 further comprises a second drain pipe, the second drain pipe communicates with the water outlet of the water pump 60. At least part of the second drain pipe can be located in the pipe running space 25, and the second drain pipe can extend to the outside of the pipe running space 25 through any one of the two pipe outlets 141.

[0134] In the embodiments of the present disclosure, the water in the water pan 67 is pumped out by the water pump 60, so that the water in the water pan 67 can be completely discharged. The second drain pipe communicates with the water outlet of the water pump 60, so that the second drain pipe can discharge the water pumped out by the water pump 60. 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 connection of the drain pipe. In this way, the drain pipe does not need to be wound on the outside of the indoor unit, which reduces the complexity of the pipeline arrangement and improves the convenience of the pipe connection.

[0135] 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 in the containing cavity 13 and on one side of the heat exchanger 40.

[0136] In the embodiments of the present disclosure, the water pump 60 can be located outside the accommodating cavity 13, so that the disassembly and assembly of the water pump 60 do not need to open the shell, and the disassembly and assembly of the water pump 60 can be realized from the outside of the shell. The water pump 60 can also be located inside the accommodating cavity 13 and on one side of the heat exchanger 40 in the length direction, so that the water pump 60 can be disassembled and assembled from one side of the heat exchanger 40, the water pump 60 is not close to the cross-flow fan 30, and does not interfere with the motor 32 and other components of the cross-flow fan 30, so that the water pump 60 can be independently disassembled and assembled, the convenience of maintenance of the water pump 60 is improved, and the convenience of disassembly and maintenance of the cross-flow fan 30 is also improved.

[0137] Optionally, the water pump 60 is arranged on the side of the side plate 14 away from the accommodating 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 to the outside of the indoor unit.

[0138] Optionally, as shown in Figure 4 , the water pan 67 includes a bottom plate and a side edge, the side edge is connected to the side of the bottom plate facing the pipe running space 25 and extends in 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. 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 the side of the bottom plate facing the pipe running space 25. The side edge is provided with the pipe running opening 68, the pipe running opening 68 is convenient for the first pipeline 51 to pass through and extend into the pipe running space 25, so that the water capacity of the water pan 67 can be ensured.

[0139] 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 to the water outlet 69 through the water outlet gap, 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 to discharge the water in the water pump water pan 61; the indoor unit further includes a two-way joint pipe 65, the two-way joint pipe 65 is connected between the water outlet 69 and the water pump water pan 61, so that the water in the water pan 67 is discharged into the water pump water pan 61 through the two-way joint pipe 65.

[0140] In the embodiments of the present disclosure, the water pump water pan 61 is connected to the water inlet of the water pan 67 through the two-way joint pipe 65, so that under the drive 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 discharges 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.

[0141] Optionally, the two-way joint pipe 65 is a hose. In this way, the installation flexibility can be improved by adjusting the arrangement of the two-way joint pipe 65.

[0142] Optionally, the water pump 60 also includes a float 63, a cover plate, and a discharge pipe 641. The float 63 is disposed inside the water pump receiving pan 61. The cover plate is disposed above the water pump receiving pan 61 and has a through hole. The discharge pipe 641 is connected to the outlet of the water pump 60 and extends through the through hole to the outside of the cover. The discharge pipe 641 is adapted to communicate with a second drain pipe.

[0143] In this embodiment, a float 63 is located within the water pump receiving tray 61, and the float 63 is used to detect the water level within the water pump receiving tray 61. A cover plate can cover the water pump receiving tray 61, preventing water from overflowing. The cover plate also has a through hole, through which a discharge pipe 641 extends and can communicate with a second drain pipe. In this way, the water pump body 62 can drive the water in the water pump receiving tray 61 to be discharged from the water pump 60 through the discharge pipe 641, and then discharged from the second drain pipe.

[0144] Optionally, such as Figure 9 As shown, when the water pump 60 is located outside the receiving cavity 13, it is situated on one of the left and right sides of the indoor unit. When the indoor unit needs to drain water from one of the left and right sides, the second drain pipe is directly connected to the discharge pipe of the water pump, and the second drain pipe is located outside the receiving cavity 13. When the indoor unit needs to drain water from the other side of the left and right sides, the second drain pipe can be moved into the pipe routing space 25 and then extend from the outlet 141 on the other side of the left and right sides of the pipe routing space 25, thus enabling the left and right connections of the drain pipe when the water pump 60 is externally mounted.

[0145] Optionally, when the water pump 60 is located in the receiving cavity 13 and on one side of the heat exchanger 40 along its length, the side plate 14 and the end of the heat exchanger 40 along its length enclose an installation space, the water receiving tray 67 covers the bottom of the heat exchanger 40 and the installation space, the water pump 60 is located in the installation space, the water inlet of the water pump 60 is connected to the water receiving tray 67, and the water outlet of the water pump 60 is connected to the drain outlet 69.

[0146] In this embodiment, the water pump 60 can also be installed in the receiving cavity 13 and located between the heat exchanger 40 and the side plate 14. In this way, the water pump 60 can be directly located in the water receiving tray 67. The water pump 60 can pump the water in the water receiving tray 67 to the drain outlet 69 and discharge it to the outside of the indoor unit. The second drain pipe is connected to the outlet of the water pump 60.

[0147] Optionally, when the water pump 60 is located at one side of the length direction of the heat exchanger 40, and water needs to be drained from the side of the length direction of the heat exchanger 40, the second drain pipe is located outside the containing cavity 13, and the second drain pipe is communicated with the water pump 60 to directly drain the water in the water 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 is communicated with the water outlet of the water pump 60, and then the second drain pipe is moved into the pipe running space 25 and is drained from the pipe outlet 141 at the end of the pipe running space 25 away from the water pump 60.

[0148] 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 hole by a fixing device, so that the second drain pipe can be fixed.

[0149] Optionally, the fixing device is a binding fixing device such as a cable tie.

[0150] Optionally, at least part of the pipe running space corresponds to the air inlet, that is, the pipe assembly in the pipe running space can be operated through the air inlet, further improving the convenience of pipe connection.

[0151] Optionally, the water pump 60 is detachably connected with the casing. In this way, the water pump 60 can be fixed to the casing or detached from the casing, thereby facilitating the maintenance and disassembly of the water pump.

[0152] 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 containing cavity 13, the mounting plate 66 is connected between the wall surface of the side plate 14 facing away from the containing cavity 13 and the water pump 60. Alternatively, when the water pump 60 is located in the containing 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. The water pump 60 is connected to the side plate 14 through the mounting plate 66, which facilitates the disassembly and operation of the water pump 60.

[0153] Optionally, when the water pump 60 is installed outside the containing cavity 13, the mounting plate 66 is a straight plate, and the side plate 14 and the water pump 60 are connected to the two sides of the mounting plate 66, respectively.

[0154] Optionally, when the water pump 60 is installed in the containing cavity 13, the mounting plate 66 is L-shaped, 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 abutted and connected with the side plate 14.

[0155] Optionally, the mounting plate 66 is detachably connected with the side plate 14. The mounting plate 66 can be detached to detach the water pump 60 from the casing.

[0156] Optionally, the mounting plate 66 is connected with the side plate 14 by screws. The connection by screws makes the mounting plate 66 more convenient to be detached from the side plate 14, and the cost is lower.

[0157] Optionally, the mounting plate 66 is provided with first screw holes, and the side plate 14 is provided with second screw holes, the first screw holes and the second screw holes correspond to each other, and a screw or a bolt passes through the first screw holes and the second screw holes to realize the connection of the mounting plate 66 and the side plate 14.

[0158] Optionally, the number of the first screw holes is multiple, the multiple first screw holes are arranged along the circumference of the mounting plate 66, and 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.

[0159] Optionally, as shown in Figures 1 to 3 , Figures 7 to 9 Optionally, 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. The electric control box is electrically connected with the motor, the water pump and the like, and is used for controlling the working of the cross-flow fan and the water pump.

[0160] 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, and the disassembly and assembly convenience of the electric control box 70 is improved. 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.

[0161] Optionally, the electric control box 70 is arranged at one side of the length direction of the cross-flow fan 30. In this way, the electric control box 70 is convenient to be 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.

[0162] Optionally, the electric control box 70 is detachably connected with the side plate 14.

[0163] 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, and the electric control box 70 does not increase the thickness of the indoor unit.

[0164] Optionally, the electrical control box 70 is connected to the side panel 14 with screws. The connection between the electrical control box 70 and the side panel 14 with screws also makes the disassembly and installation of the electrical control box 70 more convenient and reduces production costs.

[0165] In this embodiment, the electrical control box 70 can be connected to the side plate 14 by screws, whether it is located outside or inside the receiving cavity 13. This facilitates the connection between the electrical control box 70 and the side plate 14, and the screw connection is low-cost and easy to manufacture.

[0166] Optionally, such as Figure 18 As shown, when the control box 70 is located outside the receiving cavity 13, a retaining plate 71 is provided on the side of the control box 70 facing the side panel 14. The side panel 14 has a retaining hole 72. The retaining plate 71 extends along the height direction of the indoor unit. When the retaining plate 71 is located in the retaining hole 72, the control box 70 is connected to the side panel 14. In this way, the retaining plate extends along the height direction of the indoor unit, and the retaining plate can be inserted into or removed from the retaining hole in a vertical direction. Moreover, the structure of the retaining plate and retaining hole facilitates the removal of the control box 70 from the ceiling space.

[0167] Optionally, the card extends in an upward direction, so that the card can be inserted into the card hole in an upward direction and can also be disengaged from the card hole in a downward direction, so as to realize the connection and disassembly of the electrical control box 70 and the side plate 14.

[0168] It is understandable that the electrical control box 70 can also be installed in other locations, such as on one side of the air duct component 20 or on one side of the heat exchanger 40. In actual use, the position of the electrical control box 70 can be set according to the internal dimensions of the indoor unit.

[0169] Optionally, such as Figure 1 and Figure 7 As shown, the cross-flow fan 30 includes an impeller 31 and a motor 32. The motor 32 is located on the side of the impeller 31 facing the electrical control box 70, and is situated between the impeller 31 and the electrical control box 70. The motor 32 is connected to the impeller 31 and is used to drive the impeller 31 to rotate. Placing the motor 32 and the electrical control box 70 on the same side of the impeller 31 facilitates the electrical connection between the electrical control box 70 and the motor 32, and reduces the wiring distance.

[0170] Optionally, such as Figure 5 and Figure 6 As shown, the indoor unit also includes a base 33 and a motor cover 34. The base 33 has an installation groove. The motor cover 34 is located below the installation groove, and the motor cover 34 and the installation groove enclose a motor cavity, in which the motor 32 is located. The motor cover 34 and the base 33 are detachably connected.

[0171] In the embodiment of the present disclosure, the base 33 is configured with a mounting groove for mounting and fixing the motor 32, and the motor gland 34 can cover the mounting groove, so that the motor gland 34 can fix the motor 32 to 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 after the motor is disassembled, the impeller can also be disassembled and overhauled, thereby improving the convenience of maintenance and disassembly of the cross-flow fan.

[0172] Optionally, the motor gland 34 is configured with a clamping hole 36, and the end surface of the base 33 facing the motor gland 34 is configured with a buckle 35, and when the buckle 35 is located in the clamping hole 36, the motor gland 34 is clamped with the base 33. The operation convenience of disassembly and installation of the motor gland 34 and the base 33 is improved.

[0173] Optionally, when the motor gland 34 is clamped with the base 33, the buckle 35 includes 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.

[0174] 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 to avoid the buckle 35 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 buckle 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 to separate the buckle 35 from the clamping hole 36. Therefore, when the motor gland 34 needs to be disassembled, the buckle 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.

[0175] Optionally, the buckle 35 extends towards the air inlet 11, so that when the cross-flow fan 30 is disassembled from the air inlet 11, the buckle 35 directly faces the air inlet 11, and the connection and disassembly of the buckle 35 and the clamping hole 36 can be realized by moving the first clamping plate 351 and the second clamping plate 352.

[0176] 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, thereby facilitating the disassembly and installation of the motor gland 34.

[0177] Optionally, the motor cover 34 is screwed to the base 33. In this way, the convenience of connecting the motor cover 34 to the base 33 can be improved, and the operation is simple and the cost is low.

[0178] Optionally, when the motor cover 34 is screwed to the base 33, the motor cover 34 and the base 33 are both provided with screw holes, and the screw holes extend in the direction from the cross-flow fan 30 to the air inlet 11. In this way, the screw for connecting the cover and the base 33 can be moved in and out from the air inlet 11.

[0179] Optionally, as shown in Figure 6 , the air duct 20 is of an integrated structure. Compared with the split air duct 20, the integrated air duct 20 has lower requirements for assembly, which facilitates the installation of the air duct 20 in the indoor unit, and the air duct 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.

[0180] Optionally, the air duct 20 and the base 33 are of an integrated structure.

[0181] In the embodiments of the present disclosure, the air duct 20 and the base 33 are also of an integrated structure, which facilitates the production and processing of the air duct 20, and avoids the separate assembly of the base 33, avoiding the inaccuracy of the assembly of the split air duct 20 and the base 33 or the deformation of the air duct 20 and the base 33 that cannot be installed.

[0182] In some optional embodiments, as shown in Figure 3 , the top wall of the indoor unit includes the top wall of the shell and at least part of the upper side wall of the air duct 20. At least part of the upper side wall of the air duct 20 can directly serve as the top wall of the indoor unit. Compared with the case where the top wall of the air duct 20 is completely formed by the top wall of the shell, at least part of the upper side wall of the air duct 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.

[0183] Optionally, the top wall 26 of the air duct 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, the airflow loss is reduced, and the air volume is ensured.

[0184] Optionally, the outer wall surface of the top wall 26 of the air duct 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. The first wall surface and the outer wall surface of the top wall of the shell 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 shell. 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.

[0185] Optionally, the upper wall surface of the reinforcing rib 28 further comprises a second wall surface connected to 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 improve the setting stability and strength of the top wall of the casing.

[0186] 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 to the outer wall surface of the top wall 26 of the air duct, 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 in the same horizontal plane. Moreover, the reinforcing rib 28 can improve the structural strength of the air duct 20.

[0187] 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 20 (i.e., the width direction of the indoor unit). In this way, the multiple reinforcing ribs 28 make the top wall of the indoor unit be in the same plane.

[0188] Optionally, the outer wall surface of the top wall of the air duct 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 can be avoided.

[0189] 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 (i.e., the width direction of the indoor unit), so that the strength of the top wall 26 of the air duct can be improved.

[0190] 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.

[0191] Optionally, the top wall and / or the bottom wall of the casing extend in the horizontal direction.

[0192] In the embodiments of the present disclosure, the air duct 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.

[0193] 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.

[0194] In the embodiment 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 height of the indoor unit are not increased, thereby reducing the thickness of the ceiling, 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, reducing the wind speed difference between the center and the two sides of the air duct 21, and playing a uniform flow role, so that the airflow in the air duct 21 flows 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.

[0195] 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.

[0196] Optionally, the length and height of at least part of the air outlet cavity gradually increase along the airflow direction in the air outlet cavity. Here, the fan cavity 211 is used to place the fan, and the length and height of at least part 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 are reduced, and the airflow speed is slowed down, so that the airflow can be more fully heat-exchanged with the heat exchanger 40 to ensure the heat exchange area.

[0197] 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.

[0198] In the embodiment 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.

[0199] Optionally, the air duct member 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, one 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.

[0200] 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, reducing the flow loss of the airflow in the air duct, so that the airflow of the cross-flow fan can flow smoothly to the heat exchanger.

[0201] Optionally, the opening of the arc-shaped air duct plate 291 faces away from the air duct, so that the length of the air duct along the flow direction of the airflow can gradually increase.

[0202] 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 291. Here, according to the length of the heat exchanger and the impeller, the structure of the side air duct plate is adjusted.

[0203] Optionally, the air duct member 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 member comprises the upper air duct plate, and the bottom wall of the air duct member comprises the lower air duct plate.

[0204] 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 in the expansion chamber can be slowed down, the difference between the airflow velocity at the periphery of the air duct 21 and the airflow velocity at the center is 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.

[0205] 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, thereby reducing the noise of the indoor unit during operation and improving the user experience.

[0206] Optionally, as shown in Figure 10 and Figure 17As shown, part of the wall of the air duct 21 protrudes inwardly to form a step structure 23, the step structure 23 is used to prevent the backflow of the airflow in the air duct 21, and the noise reduction structure includes the step structure 23.

[0207] In the embodiment of the present disclosure, the step structure 23 can prevent the backflow of the airflow in the air duct 21. Since the heat exchanger 40 is located on the air outlet side of the cross-flow fan 30, the airflow resistance at the heat exchanger 40 is relatively large. 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 internal flow of the air duct 21 to be turbulent and the noise value to be high. The step structure 23 is arranged in the air duct 21 and protrudes inwardly, so that the step structure 23 can prevent the backflow of the airflow in the air duct 21, and further force the airflow in the air duct 21 to be smooth, which can reduce the noise in the air duct 21 and further reduce the noise of the indoor unit. In addition, the step structure 23 prevents the backflow of the airflow, can also avoid the turbulence of the airflow in the air duct, stabilize the internal flow field of the airflow, and further ensure the air volume of the indoor unit. Figure 22-1 As shown, the airflow backflow in the air duct is obvious. Figure 22-2 As shown, the airflow backflow is blocked, and the noise is obviously reduced. The noise reduction structure is simple and easy to operate, low in cost, simple in mechanism, and high in reliability.

[0208] Optionally, the step structure 23 includes one or more steps. When the step structure 23 includes multiple steps, the heights of the multiple steps protrude gradually increase in the direction from the heat exchanger 40 to the cross-flow fan 30.

[0209] In the embodiment of the present disclosure, the step structure 23 can include one step or multiple steps. When multiple steps are arranged, the heights of the steps protrude gradually increase in the direction away from the heat exchanger 40. In this way, the multiple steps can sequentially and gradually guide the airflow to form an airflow vortex, avoid the formation of intense airflow collision in the air duct 21, further effectively reduce the noise, avoid the surge noise caused by the backflow of the airflow, and ensure the smoothness of the airflow in the air duct 21 and the air outlet effect.

[0210] 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.

[0211] In the embodiments 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 air flow can be sequentially guided to form a vortex, air flow collision in the air duct 21 can be avoided, and the noise reduction effect of the step structure and the effect of stabilizing the internal flow field of the air flow can be improved.

[0212] 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 on the 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, L4 is the horizontal distance from the end of the fourth step away from the center of the air duct to the heat exchanger or the horizontal distance from the end of the fourth step away from the center of the air duct to the end of the step adjacent to the side of the fourth step facing the heat exchanger away from the center of the air duct, h5 is the height of the fifth step, and L5 is the horizontal distance from the end of the fourth step away from the center of the air duct to the end of the fifth step away from the center of the air duct.

[0213] In the embodiments of the present disclosure, the fifth step is located on the side of the fourth step close to the cross-flow fan 30, the height of the fifth step 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 sequentially and gradually improve the blocking effect on the backflow air flow, thereby avoiding violent air flow collision in the air duct 21 and reducing 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.

[0214] Optionally, when the first step, the second step, and the third step are arranged adjacent to each other, h1 / L1≤h2 / L2≤h3 / L3. h1, h2, and h3 are the heights of the first step, the second step, and the third step, respectively. L1 is the horizontal distance from the end of the first step away from the center of the air duct to the heat exchanger or the horizontal distance from the end of the first step away from the center of the air duct to the end of the step adjacent to the side of the first step facing the heat exchanger away from the center of the air duct. L2 is the horizontal distance from the end of the first step away from the center of the air duct to the end of the second step away from the center of the air duct. L3 is the horizontal distance from the end of the second step away from the center of the air duct to the end of the third step away from the center of the air duct.

[0215] Optionally, H / W≤1 / 3, where H is the sum of the heights of the plurality of stepped protrusions, and W is the height of the orthographic 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.

[0216] In the embodiments of the present disclosure, the sum of the heights of the plurality of stepped protrusions is less than 1 / 3 of the height of the orthographic 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, so as to ensure the flow area of the air duct 21 and avoid the flow area of the air duct 21 corresponding to the stepped protrusions being too small to increase the airflow resistance and affect the air volume. Here, when the stepped structure is located on the top wall or the bottom wall, the height refers to the up-down direction, and when the stepped structure is located on the side wall of the air duct, W refers to the length of the orthographic 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.

[0217] Optionally, H / W and W / D are positively correlated, where H is the sum of the heights of the plurality of stepped protrusions, W is the height of the orthographic 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 stepped protrusion closest to the cross-flow fan 30. In the embodiments of the present disclosure, the greater the height of the windward surface 43 of the heat exchanger 40, the greater the resistance of the heat exchanger 40, and the more backflow air flow, and the higher the height of the stepped protrusion, 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, and when the windward surface of the heat exchanger increases, the height of the stepped protrusion also increases to improve the noise reduction effect and the effect of stabilizing the air flow field. Here, when the stepped structure is located on the top wall or the bottom wall, the height refers to the up-down direction, and when the stepped structure is located on the side wall of the air duct, W refers to the length of the orthographic 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 refers to the length of the air duct 21 corresponding to the stepped protrusion closest to the cross-flow fan 30 in the left-right direction.

[0218] Optionally, along the direction of the airflow in the air duct, the stepped protrusion is inclined away from the center of the air duct. In this way, the contact surface between the airflow and the stepped protrusion can be buffered to avoid violent airflow collision between the stepped protrusion and the airflow.

[0219] 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. The second connecting plate is configured with a noise reduction structure, and the noise reduction structure includes a stepped structure 23; and / or, along the direction of the airflow in the air duct 21, the first connecting plate is inclined downward.

[0220] In the embodiments 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 airflow in the air duct 21, so that the height of the second connecting plate connected with the first connecting plate is not too high, and the second connecting plate is conveniently provided with a noise reduction structure. The second connecting plate is located downstream of the air duct 21, and airflow is easy to accumulate and generate noise here. The noise reduction structure provided on the second connecting plate can reduce the noise of the entire air duct 21.

[0221] Optionally, the first connecting plate and the second connecting plate are detachably connected. In this way, the air duct piece 20 is not only convenient to disassemble, but also the second connecting plate can be replaced according to requirements to adapt to different indoor units and improve the noise reduction effect, because the second connecting plate is provided with the stepped structure 23.

[0222] 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, and 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. The air duct part is a one-piece structure. In this way, the air duct piece 20 is convenient to install, and the air duct part will not have gaps, so that problems such as air volume loss and abnormal sound do not occur, the noise can be further reduced, and the air outlet effect can be ensured.

[0223] Optionally, the stepped structure 23 corresponds to the windward surface 43 of the first heat exchange section 41, and at least part of the projection of the stepped structure 23 is located in the projection of the first heat exchange section 41 along the height direction of the indoor unit.

[0224] In the embodiments of the present disclosure, because the first heat exchange section 41 is inclinedly arranged, the length of the air duct 21 at one 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 other end of the first heat exchange section 41 away from the air outlet 12. The stepped structure 23 corresponds to the windward surface 43 of the first heat exchange section 41, and the stepped structure 23 can be closer to the heat exchanger 40, so that the blocking effect on the backflow airflow is improved, and the noise reduction effect is improved.

[0225] Optionally, when the noise reduction structure includes the stepped structure 23, the horizontal distance between one end of the stepped 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 one end of the stepped structure 23 close to the heat exchanger 40 and the outer peripheral wall of the cross-flow fan 30.

[0226] In the embodiments of the present disclosure, the stepped structure 23 is closer to the heat exchanger 40. Because the heat exchanger 40 is located at the end of the air duct 21, the airflow is easy to accumulate at the end of the air duct 21 and backflow, so that the one end of the stepped structure 23 close to the heat exchanger 40 is close to the heat exchanger 40. In this way, the blocking effect on the backflow airflow is improved, the airflow in the air duct 21 is forced to be smooth, the noise is reduced, and the airflow flow field is stabilized.

[0227] Optionally, the step structure 23 is arranged adjacent to the heat exchanger 40 at one end of the heat exchanger, so that the backflow of the air flow is prevented to the maximum extent, and the noise in the air duct 21 is reduced.

[0228] 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.

[0229] In the embodiment 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 resisted, vortex phenomenon is formed at the air outlet 12 of the air duct 21, which causes 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, force the internal air flow to be smooth, which can also reduce 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. In combination with Figure 23-1 and Figure 23-2 , when there is no exhaust passage in the air duct, as shown in Figure 23-1 , there is obvious swirling air flow in the air duct, which can cause abnormal sound in the air duct, air volume loss and other problems. When the exhaust passage is arranged in the air duct, as shown in Figure 23-2 , the air flow vortex in the air duct disappears and is exhausted to the outside of the air duct, so that the air flow in the air duct flows more smoothly, the air volume is improved, and the noise is reduced or even disappears. In this way, no additional new parts are needed for noise reduction, the cost investment is low, and it is simple and highly reliable.

[0230] 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.

[0231] In the embodiment of the present disclosure, the heat exchanger 40 is located at the end of the air duct 21, therefore, the air flow at the position close to the heat exchanger 40 in the air duct 21 has relatively large resistance, more vortexes are formed, and the position of the exhaust passage 24 is closer to the heat exchanger 40, which can better exhaust the vortexes in the air duct 21, force the air flow in the air duct 21 to be smooth, reduce the noise in the air duct 21 and stabilize the flow field of the air flow.

[0232] Optionally, the exhaust passage 24 comprises an exhaust grille 241, the exhaust grille 241 is in a strip shape, and the two ends of the exhaust grille 241 in the height direction are located on the upper and lower sides of the center line of the air duct 21, respectively.

[0233] 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.

[0234] 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.

[0235] 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.

[0236] 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.

[0237] 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.

[0238] Optionally, such as Figure 14 As shown, Figure 14The middle arrow indicates the flow direction of the air flow in the first return air passage and the second return air passage. The first return air passage 292 is defined between the casing and the air duct piece 20, and is communicated between the exhaust passage 24 and the air inlet 11, so that the air flow of the exhaust passage 24 can flow to the air inlet 11 through the first return air passage; and / or, the air duct piece 20 defines the second return air passage 293, which is communicated between the exhaust passage 24 and the air inlet 11, so that the air flow of the exhaust passage 24 can flow to the air inlet 11 through the second return air passage. In the embodiment of the present disclosure, the air flow of the exhaust passage 24 flows back to the air inlet 11 through the first return air passage 292 and / or the second return air passage 293, and here, the first return air passage and the second return air passage are both located in the casing, that is, the air flow in the air duct 21 flowing out of the exhaust passage 24 will not flow to the environment outside the casing, but will flow back to the air inlet in the casing to be recycled again. Since the indoor unit is located in the ceiling, the space in the ceiling is relatively closed, the air flow of the exhaust passage 24 will not be discharged to the outside of the indoor unit, that is, will not enter the ceiling, will not affect the pressure in the ceiling, will not cause the air flow in the ceiling to be turbulent to cause dust to fly, and the dust in the ceiling will not enter the air duct 21 through the exhaust passage 24, so as to avoid the air duct 21 from being affected by the entering dust to affect the work of the fan, and thus ensure the normal work of the indoor unit.

[0239] Optionally, when the first return air passage is defined between the casing and the air duct piece 20, the casing comprises a side plate 14, which is located outside the left side wall of the air duct 21 and / or the right side wall of the air duct 21, and the side plate 14 and the left side wall of the air duct 21 and / or the right side wall of the air duct 21 enclose the first return air passage.

[0240] In the embodiment of the present disclosure, the side plate 14 and the left side wall of the air duct 21 and / or the right side wall of the air duct 21 can directly enclose the first return air passage, so that the side plate 14 can avoid the air flow flowing out of the exhaust passage 24 from flowing to the outside of the casing.

[0241] Optionally, when the second return air passage is defined by the air duct piece 20, the air duct piece 20 comprises an air duct piece body and an air duct side plate 29, the air duct piece body defines the air duct 21; the air duct side plate 29 is connected with the air duct piece body and is located outside the exhaust passage 24, and the air duct side plate 29 and the air duct piece body enclose the second return air passage.

[0242] In the embodiment of the present disclosure, the air duct piece 20 itself can also define the 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 avoid the air flow of the exhaust passage 24 from flowing to the other components, and can ensure that the air flow discharged from the exhaust passage 24 can flow to the air inlet 11 through the second return air passage.

[0243] 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 avoid the air flow in the exhaust passage 24 from exchanging heat with the refrigerant pipe 54, avoid the temperature change of the refrigerant medium in the refrigerant pipe 54, and affect the normal work of the indoor unit.

[0244] 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.

[0245] 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.

[0246] Optionally, the air duct piece 20 comprises 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 comprises a left side air duct plate, and the right side wall of the air duct comprises a right side air duct plate, wherein the side air duct plate is configured with a noise reduction structure, and the noise reduction structure comprises an exhaust passage 24.

[0247] Optionally, as shown in Figure 6 The air flow in the air duct 21 flows to the first flow guide rib 81, and the first flow guide rib 81 can straighten the air flow, so that the air flow in the air duct 21 is distributed approximately uniformly along the length direction of the air duct 21, the eccentric vortex position is relatively stable, the eccentric vortex is prevented from moving, the return air is avoided, and the noise is reduced. Moreover, the first flow guide rib 81 is easy to implement and has low cost. Figure 6 The arrow in the middle indicates the length direction of the air duct 21.

[0248] Optionally, the number of the first flow guide ribs 81 is multiple, and the multiple first flow guide ribs 81 are sequentially arranged along the length direction of the air duct 21, so that the more uniformly the first flow guide ribs 81 are distributed along the length direction of the air duct 21, the better the straightening effect is. Wherein, the distance between the multiple first flow guide ribs 81 respectively located on the opposite sides of the at least one first flow guide rib 81 and / or between adjacent two first flow guide ribs 81 is greater than or equal to 30 mm and less than or equal to 120 mm. Here, the distance between the adjacent two first flow guide ribs 81 is less than 30 mm, which is too dense and increases the air flow resistance, and the distance between the adjacent two first flow guide ribs 81 is greater than 120 mm, which reduces the straightening effect.

[0249] Optionally, the flow 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 achieve straightening.

[0250] Optionally, the guide ribs 80 include first end portions and second end portions arranged in sequence along the flow direction of the air flow. Along the flow direction of the air flow in the air duct 21, the first end portions are inclined toward the direction close to the center of the air duct 21 and / or the second end portions are inclined toward the direction away from the center of the air duct 21. In this way, the resistance of the end portions of the guide ribs 80 to the air flow is reduced.

[0251] 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 ribs 81. In this way, the air flow in the up-down direction of the air duct 21 can be straightened.

[0252] Optionally, the first guide ribs 81 of the inner wall surface of the upper air duct plate and the first guide ribs 81 of the inner wall surface of the lower air duct plate 263 are staggered, which further improves the straightening effect.

[0253] Optionally, the guide ribs 80 further include second guide ribs 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 ribs 82. In this way, the air flow in the left-right direction of the air duct 21 can also be straightened.

[0254] Optionally, the second guide ribs 82 are arranged on the wall surface of the air exhaust grilles 241 facing the air duct 21, and the second guide ribs 82 are connected between the plurality of air exhaust grilles 241. In this way, the second guide ribs 82 can not only straighten the air flow, but also improve the strength of the air exhaust grilles 241, thereby ensuring the strength of the air duct 20.

[0255] Optionally, as shown in Figures 19 to 21 Optionally, the volute tongue 27 includes a first section 273 and a second section 274, which are arranged in sequence along the flow direction of the air flow in the air duct 21, and the connection between the first section 273 and the second section 274 forms a bend toward the axis of the air duct 21. The volute tongue 27 is detachably connected with the air duct. In this way, the production and processing of the air duct 20 are facilitated, and the cost is reduced.

[0256] Optionally, the volute tongue 27 is clamped with the air duct, which is convenient to operate.

[0257] Optionally, the second section 274 of the volute tongue 27 is provided with a pressure relief hole 271. The high-pressure vortex flow in the air duct 21 can be discharged through the pressure relief hole 271, so as to achieve pressure relief. The air flow in the entire air duct 21 becomes relatively smooth, the position of the eccentric vortex becomes relatively stable, the turbulence is reduced, and the noise is reduced. The first section 273 is not provided with the pressure relief hole 271. The pressure relief hole 271 is arranged in the second section 274, so as to achieve pressure relief and avoid affecting the air volume of the indoor unit due to the air in the air duct 21 being discharged through the first section 273.

[0258] 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. Here, the distance between the pressure relief hole 271 and the bending portion is less than 5 mm, which is too far from the heat exchanger 40, and the pressure relief effect is not obvious. When the distance between the pressure relief hole 271 and the bending portion is greater than 15 mm, the area where the pressure relief hole 271 can be arranged on the second section 274 is limited under the condition that the size of the volute tongue 27 is constant, and the total area of the opening of the pressure relief hole 271 cannot meet the requirement.

[0259] 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 spaced arranged along the length direction of the volute tongue 27, wherein 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 caused by the superposition of the same frequency band pulsation, thereby reducing the noise value.

[0260] 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.

[0261] 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.

[0262] 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.

[0263] 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.

[0264] Here, the sound absorption cavity 276 is a closed structure. When the frequency of the incident sound wave in the sound absorption cavity 276 approaches the natural frequency of the resonator formed by the sound absorption cavity 276 and the pressure relief hole 271, the air column at the pressure relief hole 271 produces strong vibration. In the vibration process, sound energy is consumed due to overcoming friction resistance, thereby realizing sound absorption.

[0265] The embodiment of the present disclosure also provides an air conditioner, which comprises the indoor unit of any one of the above embodiments.

[0266] The air conditioner provided by the embodiment of the present disclosure has the beneficial effects of the indoor unit of any one of the above embodiments, and details are not repeated here.

[0267] The air conditioner further comprises an outdoor unit, which is communicated with the indoor unit through refrigerant pipes and forms a refrigerant circulation loop. Alternatively, the indoor unit can be a ducted unit or other forms of air conditioner.

[0268] The above description and drawings suffice to fully illustrate 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. 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 indoor unit, characterized by, The air conditioner indoor unit comprises: a housing defining a receiving cavity with an air inlet and an air outlet; a heat exchanger located in the receiving cavity; a cross-flow fan located in the receiving cavity in the direction from the air inlet to the air outlet, the heat exchanger and the cross-flow fan being sequentially arranged in the receiving cavity; an air duct located in the receiving cavity, the air duct defining an air passage, the air passage being in communication between the cross-flow fan and the heat exchanger; wherein a noise reduction structure is configured in the air passage.

2. The air conditioner indoor unit according to claim 1, wherein a part of a wall of the air passage protrudes inwardly to form a step structure, the step structure being configured to prevent backflow of air in the air passage, the noise reduction structure comprising the step structure, and / or a side wall of the air passage is provided with an exhaust passage, the exhaust passage being in communication between the outside of the air passage and the inside of the air passage, the noise reduction structure comprising the exhaust passage.

3. The air conditioner indoor unit according to claim 2, wherein when the noise reduction structure comprises the step structure, the step structure comprises one or more steps, and when the step structure comprises a plurality of steps, the plurality of steps protrude in a gradually increasing height in the direction from the heat exchanger to the cross-flow fan.

4. The indoor unit of claim 3, characterized in that, The plurality of steps comprise: a first step; a second step located on a side of the first step facing the cross-flow fan; a third step located on a side of the second step facing the cross-flow fan; wherein the height difference between the second step and the first step is less than the height difference between the third step and the second step.

5. The indoor unit of claim 3, characterized in that, When the number of steps is a plurality, the plurality of steps extend in a stepped manner, and the plurality of steps comprise: a fourth step; a fifth step located adjacent to the fourth step and on a side of the fourth step facing the cross-flow fan; wherein h4 / L4≤h5 / L5, wherein h4 is the height by which the fourth step protrudes, L4 is the horizontal distance from the end of the fourth step away from the center of the air passage to the heat exchanger or the horizontal distance from the end of the fourth step away from the center of the air passage to the end of the step adjacent to the side of the fourth step facing the heat exchanger away from the center of the air passage, h5 is the height by which the fifth step protrudes, and L5 is the horizontal distance from the end of the fourth step away from the center of the air passage to the end of the fifth step away from the center of the air passage; and / or in the direction of air flow in the air passage, the steps are inclined away from the center of the air passage.

6. The air conditioner indoor unit according to claim 3, wherein H / W≤1 / 3, wherein H is the sum of the heights by which the plurality of steps protrude, and W is the height of the normal projection of the windward surface of the heat exchanger in the direction from the cross-flow fan to the heat exchanger; and / or H / W is positively correlated with W / D, wherein H is the sum of the heights by which the plurality of steps protrude, W is the height of the normal projection of the windward surface of the heat exchanger in the direction from the cross-flow fan to the heat exchanger, and D is the height of the air passage corresponding to the step closest to the cross-flow fan.

7. The indoor unit of claim 3, characterized in that, The air duct comprises: a first connecting plate corresponding to the cross-flow fan at one end; a second connecting plate corresponding to the other end of the first connecting plate at one end, the other end of the second connecting plate being connected to the heat exchanger; wherein the second connecting plate is configured with a step structure, one end of the second connecting plate is connected to the other end of the first connecting plate on a side away from the center of the air passage, and the connection between the one end of the second connecting plate and the other end of the first connecting plate forms a step.

8. The indoor unit according to any one of claims 2 to 7, characterized in that the heat exchanger The air conditioner indoor unit comprises: a first heat exchange section, the first heat exchange section being in the form of a straight plate, and the first heat exchange section being inclined upward or downward in the direction of air flow in the air passage; The step structure corresponds to the windward surface of the first heat exchange section, and at least part of the projection of the step structure in the height direction of the indoor unit is located within the projection of the first heat exchange section; and / or, When the noise reduction structure comprises the step structure, the horizontal distance between the end of the step structure close to the heat exchanger and the windward surface of the heat exchanger is less than the shortest horizontal distance between the end of the step structure close to the heat exchanger and the outer peripheral wall of the cross-flow fan.

9. The indoor unit of claim 2, wherein, When the noise reduction structure comprises the air exhaust channel, at least one of the left side wall and the right side wall of the air duct is provided with an air exhaust channel, and the center of the air exhaust channel is closer to the heat exchanger than to the cross-flow fan.

10. The indoor unit according to claim 9, wherein The air exhaust channel comprises an air exhaust grille, the air exhaust grille is in a strip shape, and the two ends of the air exhaust grille in the height direction are located on the upper and lower sides of the center line of the air duct, respectively; and / or The air exhaust channel comprises one air exhaust grille or a plurality of air exhaust grilles arranged side by side, the air exhaust grilles are arranged obliquely, and the air exhaust grilles have an angle with the horizontal direction.

11. The indoor unit according to claim 10, wherein When the air exhaust grilles are arranged obliquely, the angle of the air exhaust grilles with the horizontal direction ranges from 50° to 90°; and / or The air exhaust grilles are arranged parallel to the heat exchanger.

12. The indoor unit according to claim 9, wherein The first return air channel is defined between the casing and the air duct member, the first return air channel is communicated between the air exhaust channel and the air inlet, so that the airflow of the air exhaust channel can flow to the air inlet through the first return air channel; and / or The second return air channel is defined by the air duct member, the second return air channel is communicated between the air exhaust channel and the air inlet, so that the airflow of the air exhaust channel can flow to the air inlet through the second return air channel.

13. The indoor unit of claim 12, characterized in that, When the first return air channel is defined between the casing and the air duct member, the casing comprises: The side plate is located outside the left side wall of the air duct and / or the right side wall of the air duct, and the side plate and the left side wall of the air duct and / or the right side wall of the air duct enclose the first return air channel; and / or When the second return air channel is defined by the air duct member, the air duct member comprises: The air duct member body defines the air duct; The air duct side plate is connected to the air duct member body and located outside the air exhaust channel, and the air duct side plate and the air duct member body enclose the second return air channel.

14. The indoor unit according to any one of claims 2, 9 to 13, wherein The air duct comprises, in sequence along the airflow direction, a fan cavity, a diffuser cavity and a heat exchange cavity, the cross-flow fan is located in the fan cavity, the heat exchanger is located in the heat exchange cavity, the cavity wall of the diffuser cavity and the cavity wall of the heat exchange cavity are both provided with an air exhaust channel, and the area of the air exhaust channel corresponding to the heat exchange cavity is greater than the area of the air exhaust channel corresponding to the diffuser cavity.

15. An air conditioner characterized by comprising: The indoor unit according to any one of claims 1 to 14.

Images