Indoor unit and air conditioner

Abstract

This application relates to the field of air conditioning technology, disclosing an indoor unit and an air conditioner. The indoor unit includes: a casing defining a receiving cavity with an air inlet and an air outlet; a heat exchanger located within the receiving cavity; a cross-flow fan arranged sequentially within the receiving cavity along the direction from the air inlet to the air outlet; and an air duct component located within the receiving cavity, defining an air outlet duct that connects the cross-flow fan and the heat exchanger; wherein, a noise reduction structure is constructed within the air duct. The air duct connects the impeller and the heat exchanger, and the noise reduction structure within the air duct reduces noise within the duct, thereby reducing the noise during operation of the air conditioner and improving the user experience.

Description

Technical Field

[0001] This application relates to the field of air conditioning technology, such as an indoor unit and an air conditioner. Background Technology

[0002] Currently, in suction-type indoor units, the heat exchanger is located on the air intake side of the fan. The airflow after exchanging heat with the heat exchanger flows through the fan and then out of the indoor unit. Suction-type air conditioner indoor units suffer from excessive resistance due to insufficient air intake space, therefore the required air intake space is relatively high, resulting in a larger thickness of the indoor unit.

[0003] To address this, a blower-type indoor unit is disclosed in the related technology, wherein the airflow flows sequentially through a cross-flow fan and a heat exchanger to reduce the space required for air intake, thereby reducing the thickness of the indoor unit.

[0004] In the process of implementing the embodiments of this disclosure, at least the following problems were found in the related art:

[0005] In related technologies, the blower-type indoor unit has an increased resistance to airflow because the heat exchanger is located on the air outlet side of the cross-flow fan. The airflow in the duct is affected by the resistance and forms a backflow vortex, which in turn causes the smooth airflow inside the duct to be disordered, generating noise and affecting the user experience.

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

[0007] To provide a basic understanding of some aspects of the disclosed embodiments, a brief summary is given below. This summary is not intended as a general commentary, nor is it intended to identify key / important components or describe the scope of protection of these embodiments, but rather as a prelude to the detailed description that follows.

[0008] This disclosure provides an indoor unit and an air conditioner to reduce the operating noise of a blower-type indoor unit and improve the user experience.

[0009] This disclosure provides an indoor unit, which includes: a housing defining a receiving cavity having an air inlet and an air outlet; a heat exchanger located within the receiving cavity; a cross-flow fan arranged sequentially within the receiving cavity along the direction from the air inlet to the air outlet; and an air duct component located within the receiving cavity, defining an air outlet duct that connects the cross-flow fan and the heat exchanger; wherein the air duct is equipped with a noise reduction structure.

[0010] This disclosure also provides an air conditioner, which includes an indoor unit as described in any of the above embodiments.

[0011] The indoor unit and air conditioner provided in this disclosure can achieve the following technical effects:

[0012] In this embodiment of the indoor unit, the cross-flow fan and heat exchanger are arranged sequentially from the air inlet to the air outlet. The heat exchanger is located on the air outlet side of the cross-flow fan. The low resistance on the air inlet side of the cross-flow fan allows for a reduction in the length of the air duct on that side. The increased air outlet path of the cross-flow fan improves the air outlet space, allowing for a reduction in the height of the air duct connecting the cross-flow fan and the heat exchanger, thus reducing the overall thickness of the indoor unit. The air duct connects the impeller and the heat exchanger, and its internal structure includes noise reduction features to minimize noise caused by airflow recirculation, thereby reducing the operating noise of the indoor unit and improving the user experience. Furthermore, the air duct components are located within the casing, protecting them from damage during transportation and installation, preventing air leakage and extending the lifespan of the indoor unit.

[0013] Furthermore, the general description above and the description below are exemplary and explanatory only, and are not intended to limit this application. Attached Figure Description

[0014] One or more embodiments are illustrated by way of example with reference to the accompanying drawings. These illustrations and drawings do not constitute a limitation on the embodiments. Elements having the same reference numerals in the drawings are shown as similar elements. The drawings are not to be scaled. And wherein:

[0015] Figure 1 This is a structural schematic diagram of an indoor unit provided in an embodiment of this disclosure from one perspective;

[0016] Figure 2 This is a structural schematic diagram of an indoor unit provided in an embodiment of this disclosure from another perspective;

[0017] Figure 3 This is a partial structural schematic diagram of an indoor unit provided in an embodiment of this disclosure;

[0018] Figure 4 This is a partial structural schematic diagram of another indoor unit provided in an embodiment of this disclosure;

[0019] Figure 5 This is a structural schematic diagram of an indoor unit provided in an embodiment of this disclosure from another perspective;

[0020] Figure 6 This is a structural schematic diagram of an air duct component provided in an embodiment of this disclosure;

[0021] Figure 7 This is a schematic diagram of the structure of another indoor unit provided in this embodiment of the present disclosure from one perspective;

[0022] Figure 8 This is a structural schematic diagram of another indoor unit provided in an embodiment of this disclosure from another perspective;

[0023] Figure 9 This is a partial structural schematic diagram of another indoor unit provided in an embodiment of this disclosure;

[0024] Figure 10 This is a cross-sectional structural diagram of an indoor unit provided in an embodiment of this disclosure;

[0025] Figure 11 This is a cross-sectional structural schematic diagram of another indoor unit provided in an embodiment of this disclosure;

[0026] Figure 12 This is a cross-sectional structural schematic diagram of another indoor unit provided in an embodiment of this disclosure;

[0027] Figure 13 This is a schematic diagram of another indoor unit provided in an embodiment of this disclosure;

[0028] Figure 14 This is a cross-sectional structural schematic diagram of another indoor unit provided in an embodiment of this disclosure;

[0029] Figure 15 This is a schematic diagram of another indoor unit provided in an embodiment of this disclosure;

[0030] Figure 16 This is a schematic diagram of another air duct component provided in an embodiment of this disclosure;

[0031] Figure 17 This is a cross-sectional structural schematic diagram of another indoor unit provided in an embodiment of this disclosure;

[0032] Figure 18 This is a partial structural schematic diagram of another indoor unit provided in an embodiment of this disclosure;

[0033] Figure 19 This is a cross-sectional structural schematic diagram of another air duct component provided in an embodiment of this disclosure;

[0034] Figure 20 This is a schematic diagram of another air duct component provided in an embodiment of this disclosure;

[0035] Figure 21 This is a schematic diagram of the structure of a cochlear tongue provided in an embodiment of this disclosure;

[0036] Figure 22-1 This is a schematic diagram of a simulation structure of an indoor unit provided in an embodiment of this disclosure;

[0037] Figure 22-2 This is a schematic diagram of a simulation structure of another indoor unit provided in an embodiment of this disclosure;

[0038] Figure 23-1 This is a schematic diagram of a simulation structure of another indoor unit provided in an embodiment of this disclosure;

[0039] Figure 23-2 This is a schematic diagram of the simulation structure of another indoor unit provided in this embodiment.

[0040] Figure label:

[0041] 10. Casing; 11. Air inlet; 12. Air outlet; 13. Receiving cavity; 14. Side plate; 141. Pipe outlet; 20. Air duct component; 21. Air duct; 211. Fan cavity; 212. Diffuser cavity; 2121. Upper wall of diffuser cavity; 2122. Lower wall of diffuser cavity; 213. Heat exchange cavity; 22. Suction air duct; 23. Stepped structure; 231. First step; 232. Second step; 2 33. Third step; 24. Exhaust passage; 241. Exhaust grille; 25. Pipe space; 251. Groove; 26. Top wall of air duct component; 263. Lower air duct plate; 27. Volute; 271. Pressure relief hole; 272. Pressure relief passage; 273. First section; 274. Second section; 275. Hook; 276. Silencing cavity; 28. Reinforcing rib; 29. ​​Air duct side plate; 291. Curved air duct plate; 29 2. First return air duct; 293. Second return air duct; 30. Cross-flow fan; 31. Impeller; 32. Motor; 33. Base; 34. Motor cover; 35. Clip; 351. First clamping plate; 352. Second clamping plate; 36. Snap-fit ​​hole; 40. Heat exchanger; 41. First heat exchange section; 42. Second heat exchange section; 43. Windward side; 50. Piping assembly; 51. First piping; 52. Second piping 53. Adapter; 54. Refrigerant pipe; 60. Water pump; 61. Water pump drip tray; 62. Water pump body; 63. Float; 64. Cover plate; 641. Discharge pipe; 65. Two-way connector pipe; 66. Mounting plate; 67. Drip tray; 68. Pipe inlet; 69. Drain outlet; 70. Electrical control box; 71. Clip plate; 72. Clip hole; 80. Guide rib; 81. First guide rib; 82. Second guide rib. Detailed Implementation

[0042] To provide a more detailed understanding of the features and technical content of the embodiments of this disclosure, the implementation of the embodiments of this disclosure will be described in detail below with reference to the accompanying drawings. The accompanying drawings are for illustrative purposes only and are not intended to limit the embodiments of this disclosure. In the following technical description, for ease of explanation, several details are used to provide a full understanding of the disclosed embodiments. However, one or more embodiments may still be implemented without these details. In other cases, well-known structures and devices may be simplified in their depiction to simplify the drawings.

[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 includes a casing with an air inlet 11 and an air outlet 12. An air duct 21 is also formed inside the casing, connecting the air inlet 11 and the air outlet 12. The indoor unit also includes a cross-flow fan 30 and a heat exchanger 40. The cross-flow fan 30 includes an impeller 31, which is rotatably located within the air duct 21. The cross-flow fan 30 drives the airflow from the air inlet 11 into the air duct 21 to exchange heat with the heat exchanger before flowing out from the air outlet 12. The heat-exchanged airflow is either cold or hot, thus regulating the indoor temperature. The heat exchanger 40 and the impeller 31 are arranged side-by-side at intervals within the air duct 21 along the direction of airflow.

[0051] In this embodiment, the cross-flow fan 30 and impeller 31 are arranged along the direction from the air inlet 11 to the air outlet 12, thus reducing the distance between the cross-flow fan 30 and the air inlet 11 and reducing the air intake resistance. Furthermore, the heat exchanger 40 is located on the air outlet side of the cross-flow fan 30, increasing the length of the air duct on the air outlet side of the cross-flow fan 30. This increases the air outlet area on the air outlet side, allowing for a suitable reduction in the height of the air duct 21 located on the air outlet side of the cross-flow fan, thereby reducing the overall thickness of the 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 are at an angle of less than or equal to 5°. This can reduce the space occupied by the heat exchanger and the cross-flow fan, and can ensure the air volume and uniformity along the length of the indoor unit, thereby improving the temperature regulation effect of the indoor unit.

[0054] Optionally, the indoor unit is installed in the ceiling, which has a return air vent and an exhaust air vent. The return air vent corresponds to and is connected to the air inlet, and the exhaust air vent corresponds to and is connected to the air outlet. In this way, the airflow in the room flows through the return air vent and the air inlet into the air duct, and after passing through the heat exchanger in the air duct, it is discharged into the room through the air outlet and the exhaust air vent.

[0055] Optionally, an air inlet 11 is provided on the bottom wall of the casing, and the cross-flow fan 30 corresponds to the air inlet 11. 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 on the bottom wall of the casing. When the indoor unit is installed on the ceiling, the air inlet 11 faces downward and the cross-flow fan 30 is located above the air inlet 11. The cross-flow fan 30 can be directly inspected and repaired through the air inlet 11, and the cross-flow fan 30 can also be disassembled through the air inlet 11. This improves the convenience of maintenance of the cross-flow fan 30 and the indoor unit.

[0056] Optionally, the heat exchanger 40 is a finned heat exchanger, which includes multiple fins and heat exchange tubes arranged side by side. The heat exchange tubes are reciprocated and passed between the multiple fins, and the heat exchange tubes are filled with refrigerant.

[0057] Optionally, such as Figure 1 and Figure 2 As shown, the air inlet 11 is located on the front side of the bottom wall of the shell, and the air outlet 12 is located on the rear side wall of the shell. The air outlet 12 corresponds to the heat exchanger 40, so that the airflow after passing through the heat exchanger 40 can flow directly out from the air outlet 12.

[0058] Optionally, such as Figure 10 As shown, the heat exchanger 40 includes a first heat exchange section 41, which is a straight plate and is inclined upward or downward along the flow direction of the airflow in the air duct 21.

[0059] In this embodiment, the heat exchanger 40 includes a straight-plate-shaped first heat exchange section 41, which is inclined upwards or downwards along the airflow direction within the duct 21. This allows the heat exchanger 40 to meet the required heat exchange area by adjusting the tilt angle, while also preventing excessive height and thus reducing the thickness of the indoor unit. The indoor unit of this embodiment, through the arrangement of the cross-flow fan 30, the heat exchanger 40, and the inclined straight-plate-shaped first heat exchange section 41, ensures both heat exchange area and heat exchange effect while reducing the thickness of the indoor unit. This also reduces the thickness of the ceiling, freeing up more indoor space, reducing the feeling of confinement, and improving the user experience.

[0060] Optionally, such as Figure 17 As shown, the angle between the windward surface 43 of the first heat exchange section 41 and the lower wall of the air duct 21 is 60°≤γ≤120°.

[0061] In this embodiment, when the angle between the windward surface 43 of the first heat exchange section 41 and the lower wall 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 of the air duct 21. This increases the airflow resistance through the first heat exchange section 41, resulting in significant airflow loss and affecting the air output of the indoor unit. When the angle between the windward surface 43 of the first heat exchange section 41 and the lower wall of the air duct 21 is greater than 120°, the length of the first heat exchange section 41 will increase, leading to an increase in the width or length of the indoor unit. This increases the width or length dimensions of the indoor unit, which is not conducive to its widespread use. Therefore, the tilt angle of the first heat exchange section 41 is within the above-mentioned range, ensuring that the airflow resistance at the heat exchanger 40 is not too high and without affecting the width or length dimensions of the indoor unit.

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

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

[0064] Optionally, the air duct 21 includes a fan chamber 211 and an air outlet chamber connected sequentially along the airflow direction. The cross-flow fan 30 is located in the fan chamber 211, and the heat exchanger 40 is located in the air outlet chamber. The flow area of ​​the air outlet chamber gradually increases along the airflow direction within the air duct 21.

[0065] In this embodiment, the air outlet cavity is located on the air outlet side of the cross-flow fan 30. The flow area of ​​the air outlet cavity gradually increases with the flow direction of the airflow. This can reduce the airflow velocity at the center of the air outlet cavity, reduce the velocity difference between the center of the air duct 21 and the periphery of the air duct 21, reduce noise, and improve the heat exchange efficiency between the airflow and the heat exchanger 40 by reducing the velocity.

[0066] Optionally, the height of the air outlet cavity gradually increases along the airflow direction within the air duct 21; that is, the distance between the top and bottom walls of the air outlet cavity gradually increases along the airflow direction within the air duct 21. This slows down the airflow within the air outlet cavity, reducing the difference in airflow velocity between the periphery and center of the air outlet cavity, thus reducing noise. Furthermore, the slower airflow velocity allows for more thorough heat exchange with the heat exchanger 40, ensuring sufficient heat exchange area.

[0067] Optionally, the heat exchanger is located 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 includes a fan chamber 211, a diffuser chamber 212, and a heat exchange chamber 213. The air outlet chamber includes the diffuser chamber 212 and the heat exchange chamber 213. The cross-flow fan 30 is located in the fan chamber 211, and the heat exchanger 40 is located in the heat exchange chamber 213. Along the airflow direction in the diffuser chamber 212, the distance between the upper wall surface 2121 and the lower wall surface 2122 of the diffuser chamber gradually increases. That is, the height of the diffuser chamber 212 gradually increases with the airflow direction in the air duct 21. In this way, the airflow in the air duct 21 can be decelerated in the diffuser chamber 212, reducing the difference between the airflow velocity at the periphery and the center of the air duct 21, thus reducing noise. Furthermore, the slower airflow velocity allows for more thorough heat exchange with the heat exchanger 40, ensuring the heat exchange area.

[0069] Optionally, the height of the heat exchange chamber 213 is greater than the height of the diffuser chamber 212. This ensures that the air duct 21 is matched and connected to the heat exchanger 40, allowing the airflow in the air duct 21 to completely flow through the heat exchanger 40. Furthermore, the closer to the heat exchanger 40, the greater the airflow area within the heat exchange chamber, which avoids excessive airflow resistance and the formation of numerous vortices, reduces the number of vortices, decreases airflow recirculation, lowers noise, and reduces airflow velocity, allowing for sufficient heat exchange between the airflow within the heat exchange chamber and the heat exchanger.

[0070] Optionally, the upper wall 2121 of the diffuser is inclined downward along the flow direction of the airflow in the air duct 21, and the angle between the upper wall 2121 of the diffuser and the horizontal direction is 5°≤α≤15°.

[0071] In this embodiment, the upper wall surface 2121 of the diffuser cavity is inclined downward along the flow direction of the airflow in the duct 21. This guides the airflow from the cross-flow fan 30 to flow better into the heat exchanger 40. Furthermore, the downward inclination causes the airflow to tend to move downward under its own gravity, reducing the energy consumption of the cross-flow fan and the resistance of the airflow in the 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, resulting in 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, leading to a steeper upper wall surface of the duct 21, causing some airflow to flow too quickly, affecting the airflow within the duct 21 and causing airflow loss. Furthermore, if the angle between the upper wall surface 2121 of the diffuser cavity and the horizontal direction is greater than 15°, the height of the air duct 21 will increase in order to ensure the flow area of ​​the air duct 21, which will increase the thickness of the indoor unit. Therefore, within the above-mentioned tilt angle, the upper wall surface 2121 of the diffuser cavity can not only ensure the guiding effect of airflow, but also reduce airflow loss and reduce the thickness of the indoor unit.

[0072] Optionally, the angle between the upper wall surface 2121 of the diffuser and the horizontal direction is 7°≤α≤13°, or 8°≤α≤12°, or 6°≤α≤11°.

[0073] For example, the angle α between the upper wall 2121 of the diffuser 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 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 and the horizontal direction is 25°≤β≤35°.

[0075] In this embodiment, the lower wall surface 2122 of the diffuser cavity is inclined downward along the flow direction of the airflow in the duct 21. This allows the lower wall surface 2122 to guide the airflow towards the heat exchanger 40. When the angle between the lower wall surface 2122 and the horizontal direction is less than 25°, the height change of the diffuser cavity 212 is small, resulting in an insignificant diffusion effect. When the angle between the lower wall surface 2122 and the horizontal direction is greater than 35°, the inclination angle is too large, leading to turbulent airflow, noise, or reduced air volume. Furthermore, it increases the height of the duct 21, thereby increasing the thickness of the indoor unit. Therefore, within the aforementioned range, the lower wall surface 2122 of the diffuser cavity ensures both diffusion effect and smooth airflow, while also maintaining the size of the indoor unit.

[0076] Optionally, the angle between the lower wall surface 2122 of the diffuser and the horizontal direction is 27°≤β≤33°, or 28°≤β≤32°, or 29°≤β≤31°.

[0077] For example, the angle β between the upper wall 2121 of the diffuser 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 centerline in the height direction of the indoor unit.

[0079] In this embodiment, the diffuser chamber 212 is located near the top of the indoor unit, which ensures that there is sufficient extension space below the diffuser chamber 212. This ensures both the length and air volume of the diffuser chamber 212, and also ensures that the components inside the housing are more compact, avoiding an increase in the thickness of the indoor unit.

[0080] Optionally, the center of the starting end of the diffuser chamber 212 is located above the dividing line of three-quarters of the height in the height direction of the indoor unit.

[0081] In this embodiment, the diffuser chamber 212 is positioned as high as possible to ensure that there is no extra space above the indoor unit, thereby minimizing the size of the indoor unit and ensuring the length of the downward extension of the air duct 21, thus ensuring the air outlet effect while reducing the thickness of the indoor unit.

[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 suction duct 22 on the suction side of the cross-flow fan 30. This increases the length of the duct 21 on the outlet side of the cross-flow fan 30, ensuring airflow volume. Moreover, since the air inlet 11 is located on the bottom wall of the casing, the length of the suction duct 22 is relatively short, thus not increasing the thickness of the indoor unit and ensuring the "ultra-thin" size of the indoor unit.

[0083] Optionally, the indoor unit also includes a volute 27, which is located inside the air duct and is disposed on the lower wall of the air duct 21, corresponding to the cross-flow fan 30; wherein, the highest point of the volute 27 is located above the center line in the height direction of the indoor unit.

[0084] In this embodiment, the volute 27 corresponds to the cross-flow fan 30. The volute 27 is used to adjust the aerodynamic performance of the cross-flow fan 30, thus ensuring that the cross-flow fan 30 can output air. The highest point of the volute 27 is located in the upper part of the indoor unit, so that the bottom wall of the starting end of the diffuser 212 is also located above the center line of the indoor unit. This ensures that the diffuser 212 has sufficient downward extension direction and sufficient tilt angle, thereby ensuring the smoothness of airflow and the air volume in the air duct 21.

[0085] In some alternative embodiments, the heat exchanger 40 is an integral plate type.

[0086] In this embodiment, the heat exchanger 40 is generally a straight plate type, which makes the production of the heat exchanger 40 simple, the cost low, and the processing easy.

[0087] In other alternative embodiments, such as Figure 11 and Figure 12 As shown, the heat exchanger 40 also includes a second heat exchange section 42, which is connected to the first heat exchange section 41, and the connection between the second heat exchange section 42 and the first heat exchange section 41 forms an angle.

[0088] In this embodiment of the disclosure, the heat exchanger 40 may also be in other shapes, which can increase the area of ​​the heat exchanger 40 and improve the heat exchange capacity.

[0089] Optionally, the angle between the first heat exchange section 41 and the second heat exchange section 42 is oriented towards the cross-flow fan 30, which can further increase the heat exchange area and improve the heat exchange capacity.

[0090] Optionally, the second heat exchange section 42 and the first heat exchange section 41 are arranged vertically, which allows for flexible adjustment of the area of ​​the heat exchanger 40, ensuring both the heat exchange area and the amount of heat exchanged. For example, ... Figure 11 As shown, the heat exchanger is V-shaped, as... Figure 12 As shown, the heat exchanger is L-shaped.

[0091] Optionally, the first heat exchange section 41 and the second heat exchange section 42 are arranged sequentially along the flow direction of the airflow, which can also increase the heat exchange area and improve the heat exchange effect.

[0092] Optionally, such as 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 to the overall height M of the indoor unit is H1 / M≤0.45. The impeller 31 of the cross-flow fan 30 is positioned lower, which reduces the length of the air intake duct 22 and thus reduces the thickness of the indoor unit.

[0093] Alternatively, 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 ≥ 10 mm, where H1 is the distance between the center of the impeller 31 of the cross-flow fan 30 and the bottom wall of the casing, and R is the radius of the impeller 31 of the cross-flow fan 30. This avoids the air intake duct 22 being too short, thereby ensuring the air intake volume and air intake effect of the indoor unit.

[0096] Optionally, such as Figure 1 , Figures 7 to 9 As shown, the housing includes a duct component 20 and two side plates 14. The two side plates 14 are located at opposite ends of the duct component 20. The outer wall of the bottom wall of the duct component and the side plates 14 form a duct space 25. The side plates 14 have outlets 141, and the two ends of the duct space 25 are respectively connected to the two outlets 141. The indoor unit also includes a piping assembly 50, which is located within the duct space 25. The piping assembly 50 can extend to the outside of the duct space 25 through either of the two outlets 141. The piping assembly 50 is arranged adjacent to the bottom wall of the duct component.

[0097] In this embodiment, the outer wall of the bottom wall of the duct component and the side plate 14 form a duct space 25, within which the duct assembly 50 can be housed. Both ends of the duct space 25 have duct openings 68, allowing the duct assembly 50 to extend from either opening 68, thus improving the convenience of pipe connection. This eliminates the need to produce two mirror models, improving versatility. It also eliminates the need for connecting pipes to be wound around the outside of the indoor unit, and avoids bending the pipes, simplifying operation and facilitating pipe connection. Furthermore, the duct assembly 50 is positioned adjacent to the bottom wall of the duct component, ensuring no other components are between them. This facilitates the movement and installation of the duct assembly 50, preventing interference with other components and ensuring the ease of assembly and disassembly of other parts.

[0098] Optionally, the outer wall surface of the bottom wall of the duct component has a snap-fit ​​component with a snap-fit ​​groove, and the outer wall surface of the pipe assembly 50 can snap into the snap-fit ​​groove. This enables the pipe assembly 50 to be fixed.

[0099] Optionally, the outer wall of the duct assembly 50 is attached to the bottom wall of the air duct component 20. This keeps the duct assembly 50 as close as possible to the air duct component 20, avoiding increasing the thickness of the indoor unit and preventing the duct assembly 50 from protruding too much from the indoor unit, which could cause damage or affect airflow.

[0100] Optionally, such as Figure 10 As shown, the housing includes a casing 10 and an air duct component 20. The casing 10 defines a receiving cavity 13 with an air inlet 11 and an air outlet 12. A cross-flow fan 30 and a heat exchanger 40 are sequentially arranged within the receiving cavity along the direction from the air inlet 11 to the air outlet 12. The air duct component 20 is located within the receiving cavity 13 and defines an air outlet duct 21, which connects the cross-flow fan 30 and the heat exchanger 40. Here, the casing 10 is fitted over the outside of the air duct component 20, and the air outlet duct 21 is defined inside the air duct component 20. The inlet of the air duct 21 is located within the receiving cavity and communicates with the air inlet 11, while the outlet of the air duct 21 is located within the receiving cavity and communicates with the air outlet 12. In this way, the casing can be used to house other components besides the air duct component 20. In addition, the casing can protect the air duct component 20 from damage caused by external environmental factors, preventing air leakage and other issues.

[0101] Optionally, the casing includes two side panels, and the pipe routing space extends along the length of the indoor unit. The two side panels are connected to both sides of the length of the indoor unit, that is, the left and right ends of the indoor unit, thereby realizing the left and right pipe routing of the indoor unit.

[0102] Alternatively, the housing can be completely fitted onto the outer side of the outer wall of the air duct component 20, thus fully protecting the air duct component 20.

[0103] Optionally, such as Figure 10 As shown, the top wall of the housing is located outside the top wall 26 of the air duct component to protect the top wall 26 of the air duct component, and / or, the bottom wall of the housing is located outside the bottom wall of the air duct component to protect the bottom wall of the air duct component.

[0104] Optionally, the left and right sidewalls of the housing (i.e., the two side panels 14) are located on the outside of the left and right sidewalls of the air duct component 20, respectively, to protect the left and right sidewalls of the air duct component 20.

[0105] Optionally, the top wall of the housing is abutted (fitted or close to) the top wall 26 of the air duct component. This increases the strength of the air duct component 20 and the top wall of the housing, preventing damage to the air duct component 20.

[0106] Optionally, the two side panels of the housing include a left side panel and a right side panel. The right side panel is connected between the right end of the top wall of the housing and the right end of the bottom wall of the housing. The left side panel is connected between the left end of the top wall of the housing and the left end of the bottom wall of the housing. The rear side wall of the housing is connected between the rear end of the top wall of the housing, the rear end of the bottom wall of the housing, the rear end of the left side panel, and the rear end of the right side panel. The rear side wall of the housing is provided with an air outlet 12, and the bottom wall of the housing is provided with an air inlet 11.

[0107] Optionally, the housing also includes a front sidewall of the housing, which is connected between the front end of the top wall of the housing, the front end of the bottom wall of the housing, the front end of the left side panel, and the front end of the right side panel.

[0108] Optionally, such as Figure 10 As shown, the indoor unit also includes a drip tray 67, which is located below the heat exchanger 40 and is used to collect the condensate from the heat exchanger 40. One end of the drip tray 67 is connected to one end of the bottom wall of the air duct component, and the other end of the bottom wall of the air duct component is provided with a volute tongue 27, which corresponds to the impeller 31.

[0109] Optionally, the bottom wall of the housing is located below the water receiving tray 67, one end of the bottom wall of the housing is connected to one end of the bottom wall of the air duct component, and the other end of the bottom wall of the housing forms an air outlet 12.

[0110] Optionally, the bottom wall of the air duct component can be detachably connected to the bottom wall of the housing, which facilitates the disassembly and installation of the air duct component 20 and the housing.

[0111] Optionally, the bottom wall of the air duct component is connected to the bottom wall of the housing by screws or clips 35.

[0112] Optionally, one end of the bottom wall of the air duct component is detachably connected to the water receiving tray 67, which also facilitates the disassembly and installation of the water receiving tray 67.

[0113] Optionally, one end of the bottom wall of the air duct component is engaged with the water receiving tray 67.

[0114] Optionally, one end of the bottom wall of the air duct component is provided with a groove that matches one end of the water receiving tray 67, so that one end of the water receiving tray 67 can be engaged with the groove.

[0115] Optionally, the housing can be made of sheet metal. Optionally, the air duct component 20 can be made of plastic, which can reduce the cost of the indoor unit.

[0116] Optionally, such as Figure 1 , Figure 2 and Figure 8As shown, when the housing includes two spaced-apart and oppositely arranged side plates 14, the side plates 14 have outlet ports 141. Optionally, the two side plates 14 are located on the left and right sides of the indoor unit, respectively, so that the piping assembly 50 can extend from the left or right side of the indoor unit, and the side plates are part of the housing, which can protect the air duct components from the outside of the air duct components.

[0117] Optionally, such as Figure 1 As shown, the bottom wall of the duct component protrudes into the duct 21 to form a groove 251, and the pipe assembly 50 is located within the groove 251. In this embodiment of the present disclosure, the bottom wall of the duct component forms a groove 251. The groove 251 provides more space for installing the pipe assembly 50 and reduces the protruding height of the pipe assembly 50, so that the pipe assembly 50 does not additionally increase the thickness of the indoor unit.

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

[0119] In this embodiment, the height of the diffuser cavity 212 is greater than the height of the fan cavity 211. Thus, there is a groove 251 at the connection between the diffuser cavity 212 and the fan cavity 211. The pipeline assembly 50 can be placed in the groove 251 formed at the connection between the diffuser cavity 212 and the fan cavity 211. This facilitates both the installation of the pipeline assembly 50 and the formation of the diffuser cavity 212.

[0120] Optionally, such as Figure 9 and Figure 14 As shown, the piping assembly 50 includes a refrigerant pipe 54, which includes a first pipe 51, a second pipe 52, and a conversion joint 53. One end of the first pipe 51 is connected to the heat exchanger 40; one end of the second pipe 52 is connected to the other end of the first pipe 51, and at least part of the second pipe 52 is located within 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 either of the two outlet ports 141.

[0121] In this embodiment, the refrigerant pipe is used to allow liquid to enter and exit the heat exchanger 40. The second pipe 52 is connected to the first pipe 51 via a conversion joint 53. The conversion joint 53 is rotatable, so the relative position of the second pipe 52 and the first pipe 51 can be adjusted by rotating the conversion joint 53. This allows the second pipe 52 to extend from either outlet 141 on either side of the pipe space 25, so that the other end of the second pipe 52 can be connected to the outdoor unit.

[0122] Optionally, the side plate 14 and the end of the heat exchanger 40 enclose an installation space; wherein at least a portion of the first pipe 51 is located within the installation space, and the first pipe 51 extends along the width direction of the indoor unit, while the second pipe 52 extends along the length direction of the indoor unit. Thus, the second pipe 52 can extend from the outlet 141 on the left side or the outlet 141 on the right side of the indoor unit via a conversion connector 53.

[0123] For example, when the second pipe 52 extends from the left outlet 141, the second pipe is located to the left of the first pipe. When the first pipe 51 extends from the right outlet 141, the second pipe is located to the right of the first pipe.

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

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

[0126] Optionally, there are two refrigerant pipes 54 to facilitate the inlet and outlet of the heat exchanger 40. Specifically, there are two first pipes 51: one first pipe 51 connects to the inlet of the heat exchanger 40, and the other first pipe 51 connects to the outlet of the heat exchanger 40. This allows the heat exchanger 40 to have both inlet and outlet pipes on the same side, simplifying pipe installation and connection. The number of second pipes 52 is the same as the number of first pipes 51 and corresponds one-to-one. One second pipe 52 connects to one first pipe 51 to form an inlet pipe, and the other second pipe 52 connects to the other first pipe 51 to form an outlet pipe. This allows for the inlet and outlet of the heat exchanger 40 as well as its connection to the outdoor unit.

[0127] Optionally, the two first pipes 51 are arranged side by side at intervals along the length of the indoor unit.

[0128] Optionally, the two second pipes 52 are arranged side-by-side and spaced apart within the pipe routing space 25 along the width direction of the indoor unit, or the two second pipes 52 are arranged spaced apart along the height direction within the pipe routing space 25. In actual use, the installation direction of the two second pipes 52 can be set according to the size of the pipe routing space 25 and the size of the second pipes 52.

[0129] Optionally, the piping assembly 50 also includes an insulation pipe, which is sleeved on the outside of the first piping 51 and the second piping 52.

[0130] Optionally, a notch is provided at the lower end of the outlet 141. This makes the lower end of the outlet 141 not closed, which facilitates the removal or insertion of the pipeline from or into the outlet 141, further improving the ease of assembly and disassembly of the pipeline assembly 50.

[0131] Optionally, the drip tray 67 has a drain outlet 69, which abuts against the side panel 14. The side panel 14 has a drain notch, through which the drain outlet 69 communicates with the outside. This allows the drip tray 67 to better collect water and prevents water from leaking into the indoor unit. The drain notch in the side panel 14 allows water to be discharged to the outside through the drain outlet 69 of the drip tray 67, so that the water in the drip tray 67 can be drained to the outside of the indoor unit.

[0132] In some alternative embodiments, drain outlets 69 are provided at both ends of the water receiving tray 67, and the drain outlets 69 are adapted to communicate with the first drain pipe. In this embodiment of the present disclosure, the indoor unit can selectively connect the first drain pipe from the left side or the right side of the water receiving tray 67, depending on the installation position. The other end of the first drain pipe is connected to the outside, so that the water in the water receiving tray 67 can be discharged to the outside through the first drain pipe.

[0133] Optionally, the indoor unit also includes a water pump 60, which is connected to a drip tray 67. The water pump 60 is used to draw water out of the drip tray 67. The piping assembly 50 also includes a second drain pipe, which is connected to the outlet of the water pump 60. At least a portion of the second drain pipe can be located within the piping space 25, and the second drain pipe can extend to the outside of the piping space 25 through either of the two outlets 141.

[0134] In this embodiment, water in the drip tray 67 is pumped out by the water pump 60, which improves drainage efficiency and ensures that all water in the drip tray 67 is completely drained. The second drain pipe is connected to the outlet of the water pump 60, allowing it to discharge the water pumped out. The second drain pipe can also be located within the pipe routing space 25, allowing it to extend from either the left or right side for left or right connection. This eliminates the need for the drain pipe to be routed around the outside of the indoor unit, reducing piping complexity and improving connection convenience.

[0135] Optionally, such as Figures 1 to 5 As shown, the water pump 60 is located outside the receiving cavity 13, or, as... Figures 7 to 9 As shown, the water pump 60 is located inside the housing cavity 13 and on one side of the heat exchanger 40.

[0136] In this embodiment, the water pump 60 can be located outside the receiving cavity 13, so that the water pump 60 can be disassembled and installed without opening the casing, and can be disassembled and installed from the outside of the casing. Alternatively, the water pump 60 can be located inside the receiving cavity 13, on one side of the heat exchanger 40 along its length. This allows the water pump 60 to be disassembled and installed from one side of the heat exchanger 40, preventing it from being close to the cross-flow fan 30 or interfering with components such as the motor 32 of the cross-flow fan 30. This allows the water pump 60 to be disassembled and installed independently, improving the ease of maintenance of both the water pump 60 and the cross-flow fan 30.

[0137] Optionally, the water pump 60 is located on the side of the side panel 14 opposite to the receiving cavity 13. In this way, the water pump 60 can be connected to the side panel 14, and the water pump 60 can be fixed to the outside of the indoor unit.

[0138] Optionally, such as Figure 4 As shown, the water tray 67 includes a base plate and a side. The side is connected to the side of the base plate facing the pipe space 25 and extends along the height direction of the indoor unit. A pipe opening 68 is provided on the side, through which the first pipe 51 extends into the pipe space 25. In this embodiment, the side of the water tray 67 can block water from flowing out of the water tray 67 from the side of the base plate facing the pipe space 25. The pipe opening 68 on the side facilitates the passage and extension of the first pipe 51 into the pipe space 25, thus ensuring the water capacity of the water tray 67.

[0139] Optionally, such as Figure 3 and Figure 4 As shown, when the water pump 60 is located outside the receiving cavity 13, the water pump 60 is connected to the drain outlet 69 through the drain notch. The water pump 60 includes a water pump receiving tray 61 and a water pump body 62. The water pump body 62 is located inside the water pump receiving tray 61 and is used to drain the water in the water pump receiving tray 61. The indoor unit also includes a two-way connector pipe 65, which is connected between the drain outlet 69 and the water pump receiving tray 61 so that the water in the receiving tray 67 is discharged into the water pump receiving tray 61 through the two-way connector pipe 65.

[0140] In this embodiment, the water pump receiving tray 61 is connected to the water inlet of the receiving tray 67 via a bidirectional connector pipe 65. Driven by the water pump body 62, the water pump body 62 can pump water from the receiving tray 67 into the water pump receiving tray 61, and then discharge the water from the receiving tray 61. The bidirectional connector pipe 65 connects the receiving tray 67 and the water pump receiving tray 61 to achieve communication between the water pump 60 and the receiving tray.

[0141] Optionally, the bidirectional connector tube 65 can be a flexible hose. This facilitates adjustment of the bidirectional connector tube 65 and improves installation flexibility.

[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 on one side of the length direction of the heat exchanger 40, and drainage is required from one side of the length direction of the heat exchanger 40, the second drain pipe is located outside the receiving cavity 13 and is connected to the water pump 60, directly draining the water in the receiving pan 67. When drainage is required from the other side of the length direction of the heat exchanger 40 (that is, the side away from the water pump 60), after the second drain pipe is connected to the outlet of the water pump 60, the second drain pipe moves into the pipe space 25 and exits from the outlet 141 at the end of the pipe space 25 away from the water pump 60 to drain the water.

[0148] Optionally, the duct component 20 is provided with a fixing hole. When the second drain pipe is located in the pipe space 25, the second drain pipe is fixed to the bottom wall of the duct component through the fixing hole by a fixing device, so as to fix the second drain pipe.

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

[0150] Optionally, at least part of the duct space corresponds to the air inlet, meaning that the duct components in the duct space can be operated through the air inlet, further improving the convenience of connecting the pipes.

[0151] Optionally, the water pump 60 is detachably connected to the housing. This allows the water pump 60 to be installed and fixed to the housing, or removed from the housing, thus facilitating the maintenance and disassembly of the water pump.

[0152] Optionally, the indoor unit also includes a mounting plate 66, which is connected between the water pump 60 and the side panel 14. When the water pump 60 is located outside the receiving cavity 13, the mounting plate 66 is connected between the side panel 14 away from the wall of the receiving cavity 13 and the water pump 60; or, when the water pump 60 is located inside the receiving cavity 13, one end of the mounting plate 66 is connected to the side panel 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 panel 14 via the mounting plate 66, facilitating the installation and removal of the water pump 60 and providing convenient operation.

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

[0154] Optionally, when the water pump 60 is installed in the receiving cavity 13, the mounting plate 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 attached to and connected to the side plate 14.

[0155] Optionally, the mounting plate 66 is detachably connected to the side plate 14. The water pump 60 can be removed from the housing by removing the mounting plate 66.

[0156] Alternatively, the mounting plate 66 and the side plate 14 are connected by screws. Using screws makes disassembly and reassembly of the mounting plate 66 and the side plate 14 easier and less costly.

[0157] Optionally, the mounting plate 66 is provided with a first screw hole, and the side plate 14 is provided with a second screw hole. The first screw hole and the second screw hole correspond to each other, and screws or bolts pass through the first screw hole and the second screw hole to connect the mounting plate 66 and the side plate 14.

[0158] Optionally, there are multiple first screw holes, which are spaced apart along the circumference of the mounting plate 66. The number of second screw holes is the same as the number of first screw holes and corresponds one-to-one. This can improve the connection stability between the mounting plate 66 and the side plate 14.

[0159] Optionally, such as Figures 1 to 3 , Figures 7 to 9 As shown, the indoor unit also includes an electrical control box 70, and the cross-flow fan 30 and heat exchanger 40 extend along the length of the indoor unit. The electrical control box 70 is located on one side of the indoor unit along its length, either inside or outside the receiving cavity 13. The electrical control box is electrically connected to the motor, water pump, etc., and is used to control the operation of the cross-flow fan and water pump.

[0160] In this embodiment, both the cross-flow fan 30 and the heat exchanger 40 extend along the length of the indoor unit. The electrical control box 70 is located on one side of the indoor unit along its length, either inside or outside the housing cavity 13. This independent design prevents interference with the piping assembly 50 and improves the ease of installation and removal of the electrical control box 70. In this embodiment, when the electrical control box 70 is located inside the housing cavity 13, the internal structure of the indoor unit is more compact, preventing damage to the electrical control box 70 from the external environment. When the electrical control box 70 is located outside the housing cavity 13, its installation and removal are more convenient.

[0161] Optionally, the electrical control box 70 is located on one side of the cross-flow fan 30 along its length. This facilitates the connection of the electrical control box 70 to the motor 32 of the cross-flow fan 30, reducing the distance between the electrical control box 70 and the motor 32 of the cross-flow fan 30, and simplifying the wiring of the electrical control box 70.

[0162] Optionally, the electrical control box 70 is detachably connected to the side panel 14.

[0163] In this embodiment, the control box 70 is fixed to the side plate 14, so that the control box 70 is located on the left or right side of the receiving cavity 13, and the control box 70 will 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 this embodiment, the base 33 has a mounting groove for mounting and fixing the motor 32. The motor cover 34 can cover the mounting groove, thus fixing the motor 32 and preventing it from shaking or being damaged. The motor cover 34 is detachably connected to the base 33, allowing it to be removed from the base 33 for easy disassembly of the motor 32. After the motor is removed, the impeller can also be disassembled and inspected, thereby improving the convenience of maintenance and disassembly / reassembly of the cross-flow fan.

[0172] Optionally, the motor cover 34 is provided with a snap-fit ​​hole 36, and the end face of the base 33 facing the motor cover 34 is provided with a buckle 35. When the buckle 35 is located in the snap-fit ​​hole 36, the motor cover 34 and the base 33 are snapped together. This improves the ease of disassembly and installation of the motor cover 34 and the base 33.

[0173] Optionally, when the motor cover 34 is engaged with the base 33, the buckle 35 includes a first locking plate 351 and a second locking plate 352, which are arranged side by side with the first locking plate 351 at intervals. The first locking plate 351 and the second locking plate 352 are made of elastic material, and the first locking plate 351 and the second locking plate 352 can move towards each other or away from each other. When the first locking plate 351 and the second locking plate 352 move towards each other, the first locking plate 351 and the second locking plate 352 undergo elastic deformation and can disengage from the locking hole 36.

[0174] In this embodiment, the first locking plate 351 and the second locking plate 352 can move towards each other or move away from each other. When the first locking plate 351 and the second locking plate 352 are in their original positions, they can engage with the locking hole 36, preventing the buckle 35 from disengaging from the locking hole 36. When the first locking plate 351 and the second locking plate 352 are pinched and moved towards each other, the area of ​​the buckle 35 formed by the first locking plate 351 and the second locking plate 352 decreases, allowing the first locking plate 351 and the second locking plate 352 to disengage from the locking hole 36, thus separating the buckle 35 from the locking hole 36. Therefore, when it is necessary to disassemble the motor cover 34, by pinching the first locking plate 351 and the second locking plate 352 and moving them towards each other, the buckle 35 can be disengaged from the locking hole 36, allowing the motor cover 34 and the base 33 to separate.

[0175] Optionally, the buckle 35 extends toward the air inlet 11, so that when the cross-flow fan 30 is removed from the air inlet 11, the buckle 35 is directly facing the air inlet 11, and the connection and removal of the buckle 35 and the snap-fit ​​hole 36 can be achieved by moving the first snap plate 351 and the second snap plate 352.

[0176] Optionally, the motor cover 34 and the base 33 are arranged sequentially along the direction from the air inlet 11 to the cross-flow fan 30, so that the motor cover 34 faces the air inlet 11, which facilitates the disassembly and installation of the motor cover 34.

[0177] Optionally, the motor cover 34 is screwed to the base 33. This improves the ease of connection between the motor cover 34 and the base 33, and is simple to operate and cost-effective.

[0178] Optionally, when the motor cover 34 and the base 33 are connected by screws, both the motor cover 34 and the base 33 are provided with screw holes. The screw holes extend along the direction from the cross-flow fan 30 to the air inlet 11, so that the screws connecting the cover and the base 33 can be moved in and out from the air inlet 11.

[0179] Optionally, such as Figure 6 As shown, the air duct component 20 is a one-piece structure. Compared with the split air duct component 20, the one-piece air duct component 20 has lower assembly requirements, which facilitates the installation of the air duct component 20 in the indoor unit. Moreover, the air duct component 20 has no gaps, so there will be no problems such as air volume loss and abnormal noise, which can further reduce noise and ensure air output effect.

[0180] Optionally, the air duct component 20 and the base 33 are integrated into one piece.

[0181] In this embodiment, the air duct component 20 and the base 33 are also an integral structure, which facilitates the production and processing of the air duct component 20 and eliminates the need for separate assembly of the base 33, thus avoiding the situation where the separate air duct component 20 and the base 33 are inaccurately assembled or deformed and cannot be installed.

[0182] In some alternative embodiments, such as Figure 3 As shown, the top wall of the indoor unit includes the top wall of the casing and at least a portion of the upper side wall of the air duct component 20. The at least portion of the upper side wall of the air duct component 20 can directly serve as the top wall of the indoor unit. Compared to using the entire top wall of the casing as the top wall of the air duct component 20, using at least a portion of the upper side wall of the air duct component 20 as the top wall of the indoor unit can further reduce the product cost of the indoor unit and also further reduce its thickness.

[0183] Optionally, the top wall 26 of the duct component is arc-shaped, and the arc-shaped opening faces into the duct 21. This makes the airflow within the duct 21 smoother, reduces airflow loss, and ensures air volume.

[0184] Optionally, the outer wall surface of the top wall 26 of the air duct component is provided with a reinforcing rib 28. The upper wall surface of the reinforcing rib 28 includes a first wall surface, which extends horizontally. The first wall surface and the outer wall surface of the top wall of the casing form the outer wall surface of the upper side wall of the indoor unit. The first wall surface and the outer wall surface of the top wall of the casing are flush, so that the upper wall surface of the indoor unit can be on the same plane, which facilitates the horizontal placement of the indoor unit.

[0185] Optionally, the upper wall surface of the reinforcing rib 28 also includes a second wall surface, which is connected to the first wall surface and is located below the top wall of the housing. In this way, the reinforcing rib 28 can support the top wall of the housing and improve the stability and strength of the top wall of the housing.

[0186] Optionally, the reinforcing rib 28 extends along the airflow direction within the duct 21, with its lower end connected to the outer wall surface of the top wall 26 of the duct component, and the upper end of the reinforcing rib 28 including a first wall surface. This allows the upper end of the reinforcing rib 28 to extend horizontally, ensuring that the top wall of the indoor unit is on the same horizontal plane. Furthermore, the reinforcing rib 28 improves the structural strength of the duct component 20.

[0187] Optionally, the reinforcing ribs 28 extend along the width direction of the indoor unit, and there are multiple reinforcing ribs 28, which are arranged sequentially at intervals along the width direction of the air duct component 20 (that is, the width direction of the indoor unit). In this way, the multiple reinforcing ribs 28 make the top wall of the indoor unit lie on the same plane.

[0188] Optionally, the outer wall surface of the top wall of the air duct component 20 is also provided with connecting ribs, which extend along the length of the indoor unit and connect between multiple reinforcing ribs 28. This ensures the stability of the connecting ribs and prevents deformation of the reinforcing ribs 28.

[0189] Optionally, there are multiple connecting ribs, which are arranged sequentially at intervals along the airflow direction (i.e., the width direction of the indoor unit) within the air duct 21, thereby increasing the strength of the top wall 26 of the air duct component.

[0190] In some alternative embodiments, the top wall of the housing is the top wall of the indoor unit, that is, the top wall of the housing completely covers the top wall of the air duct component.

[0191] Optionally, the top and / or bottom walls of the housing extend in a horizontal direction.

[0192] In this embodiment, the air duct component 20 is located inside the housing, and the top wall and / or bottom wall of the housing can extend horizontally. This allows the top and bottom walls of the indoor unit to extend horizontally, which facilitates the installation of the indoor unit and allows it to be installed more closely to the ceiling, reducing the space occupied by the indoor unit within the ceiling.

[0193] Optionally, such as Figure 5 and Figure 16 As shown, the axial length of heat exchanger 40 is greater than the axial length of impeller 31.

[0194] In this embodiment, the axial length of the impeller of the cross-flow fan is less than the axial length of the heat exchanger, and both the heat exchanger and the impeller are located within the air duct. This increases the heat exchange area between the airflow passing through the impeller and the heat exchanger along its length, eliminating the need to increase the height of the heat exchanger and thus improving the heat exchange efficiency of the indoor unit. Since the length of the heat exchanger is greater than the length of the impeller, this ensures sufficient heat exchange capacity without increasing the height of the heat exchanger, which in turn does not increase the height of the indoor unit. This reduces the thickness of the ceiling, freeing up more indoor space and improving the user experience. Furthermore, when the airflow at impeller 31 flows along the duct 21 to the heat exchanger 40, the flow area of ​​the airflow from impeller 31 to heat exchanger 40 can be increased due to the long length of heat exchanger 40. This can reduce the wind pressure at the center of duct 21, disperse the wind speed, reduce the wind speed difference between the center and both sides of duct 21, and play a role in equalizing the flow. This makes the airflow in duct 21 flow more evenly, so that the airflow in duct 21 can fully exchange heat with heat exchanger 40 in the length direction, which can improve the heat exchange efficiency with heat exchanger 40 to a certain extent, and also reduce noise.

[0195] Optionally, the length of the duct component 20 gradually increases along the airflow direction within the duct 21, which ensures that the air outlet of the impeller 31 can flow to the heat exchanger 40.

[0196] Optionally, along the flow direction of the airflow within the outlet cavity, at least a portion of the outlet cavity gradually increases in length and height. Here, the fan cavity 211 is used to house the fan, and at least a portion of the outlet cavity gradually increases in both length and height. This increases the flow area of ​​the duct 21 in both length and height directions, thereby slowing down the airflow. This reduces the airflow velocity at the periphery and center of the duct 21, lowers noise, and allows for more thorough heat exchange with the heat exchanger 40, ensuring sufficient heat exchange area.

[0197] Optionally, the motor 32 is located at the first end of the impeller 31 along its length; wherein the second end of the impeller 31 along its length is flush with the second end of the heat exchanger 40 along its length, and the first end of the heat exchanger 40 along its length protrudes beyond the first end of the impeller 31 along its length.

[0198] In this embodiment, the impeller 31 is flush with one end of the heat exchanger 40, and the second end of the heat exchanger 40 protrudes beyond it. This facilitates the installation of the heat exchanger 40 and the cross-flow fan 30, and also facilitates the production and processing of the internal air duct 21. Furthermore, by only having one end of the heat exchanger 40 protrude beyond the impeller 31, a larger external space is ensured on one side of the air duct 21, allowing for the centralized placement of components and improving the overall compactness of the machine structure.

[0199] Optionally, the air duct component 20 includes a side air duct plate, which is located on the left side and / or the right side of the air duct. A side air duct plate includes a first side air duct plate and a second side air duct plate connected sequentially along the airflow direction in the air duct. The first side air duct plate is located on one side of the fan cavity, and the second side air duct plate is located on one side of the air outlet cavity. The second side air duct plate includes a smoothly transitioned arc-shaped air duct plate 291.

[0200] In this embodiment of the present disclosure, the second side air duct plate includes a smoothly transitioned arc-shaped air duct plate 291, which makes the inner wall of the air duct smoother and reduces the flow loss of 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 curved air duct plate 291 is away from the air duct, so that the length of the air duct gradually increases along the airflow direction.

[0202] Optionally, the number of side air duct plates can be one or two. When there are two side air duct plates, the two side air duct plates are located on the left and right sides of the air duct, respectively. At least one side air duct plate includes an arc-shaped air duct plate 291. Here, the structure of the side air duct plates is adjusted according to the length of the heat exchanger and impeller.

[0203] Optionally, the air duct component 20 includes a lower air duct plate and an upper air duct plate. The lower air duct plate is constructed with a volute tongue 27, which cooperates with the impeller 31. The upper air duct plate is located above the lower air duct plate and together with the lower air duct plate encloses the air duct 21. 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. Here, the top wall 26 of the air duct component includes the upper air duct plate, and the bottom wall of the air duct component includes the lower air duct plate.

[0204] In this embodiment, the upper and lower air duct plates enclose the air duct 21 from the top and bottom, and the distance between the upper and lower air duct plates gradually increases along the flow direction of the airflow in the air duct 21. This forms a diffuser chamber 212, which slows down the airflow in the diffuser chamber. The difference between the airflow velocity at the periphery and the airflow velocity at the center of the air duct 21 is reduced, thus reducing noise. Furthermore, the slower airflow velocity allows the airflow to exchange heat more fully with the heat exchanger 40, thereby ensuring the heat exchange area.

[0205] Optionally, such as Figure 10 , Figures 13 to 14 As shown, the air duct 21 has a noise reduction structure. This structure reduces noise within the air duct 21, thereby lowering the noise level of the indoor unit during operation and improving the user experience.

[0206] Optionally, such as Figure 10 and Figure 17As shown, a portion of the wall of the air duct 21 protrudes into the air duct 21 to form a stepped structure 23. The stepped structure 23 is used to prevent the airflow in the air duct 21 from flowing back. The noise reduction structure includes the stepped structure 23.

[0207] In this embodiment, the stepped structure 23 prevents airflow backflow within the duct 21. Since the heat exchanger 40 is located on the outlet side of the cross-flow fan 30, the airflow resistance at the heat exchanger 40 is relatively high. The airflow near the heat exchanger 40 at the end of the duct 21 experiences resistance and partially backflows along the boundary of the duct 21, leading to turbulent flow and higher noise levels within the duct 21. By providing the stepped structure 23 within the duct 21, which protrudes inwards, the stepped structure 23 prevents airflow backflow, thus forcing smooth airflow within the duct 21 and reducing noise within the duct 21, thereby reducing the noise of the indoor unit. Furthermore, the stepped structure 23 prevents airflow backflow and avoids airflow turbulence within the duct, stabilizing the internal flow field and ensuring the airflow volume of the indoor unit. When the stepped structure is not provided within the duct, such as... Figure 22-1 As shown, airflow recirculation is evident within the duct. When a stepped structure is incorporated into the duct, such as... Figure 22-2 As shown, the airflow recirculation is blocked, and the noise is significantly reduced. This noise reduction structure is simple to operate, low in cost, and has a simple mechanism and high reliability.

[0208] Optionally, the stepped structure 23 includes one or more steps. When the stepped structure 23 includes multiple steps, the height of the multiple steps gradually increases along the direction from the heat exchanger 40 to the cross-flow fan 30.

[0209] In this embodiment of the disclosure, the step structure 23 can be provided with one step or multiple steps. When multiple steps are provided, the height of the step protrusion gradually increases along the direction away from the heat exchanger 40. In this way, multiple steps can gradually guide the airflow to form an airflow vortex, avoid the formation of intense airflow collisions in the air duct 21, thereby effectively reducing noise, avoiding the surge noise caused by airflow backflow, and ensuring the smooth flow of air in the air duct 21 to ensure the air outlet effect.

[0210] Optionally, the multiple steps include a first step 231, a second step 232, and a third step 233, wherein the second step 232 is located on the side of the first step 231 facing the cross-flow fan 30; the third step 233 is located on the side of the second step 232 facing the cross-flow fan 30; wherein 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 this embodiment of the disclosure, when multiple steps are provided, the height of the step protrusion gradually increases along the direction away from the heat exchanger 40, and the height difference between two adjacent steps gradually increases. This can gradually guide the airflow to form vortices, avoid airflow collisions in the air duct 21, and thus improve the noise reduction effect of the step structure and the effect of stabilizing the internal flow field of the airflow.

[0212] Optionally, when there are multiple steps, the multiple steps extend in a stepped manner, and the multiple steps include a fourth step and a fifth step. The fifth step is arranged adjacent to the fourth step and is located on the side of the fourth step facing the cross-flow fan 30. Wherein, h4 / L4≤h5 / L5, where h4 is the height of the protrusion 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 protrusion 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 this embodiment, the fifth step is located on the side of the fourth step closer 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 and fourth steps is less than the distance between the fourth step and its adjacent step on the side facing the heat exchanger 40, or the distance between the fourth step and the heat exchanger 40. Thus, the gradually increasing height of the steps along the direction away from the heat exchanger 40 enhances the obstruction effect on the return airflow. Alternatively, the increasing density of the steps along the direction away from the heat exchanger 40 gradually improves the obstruction effect on the return airflow, thereby preventing intense airflow collisions within the duct 21 and reducing noise. It should be noted that the fourth step can be any one of the first, second, and third steps, and the fifth step can be any one of the first, second, and third steps adjacent to the side facing the cross-flow fan.

[0214] Optionally, when the first step, second step, and third step are arranged adjacently, h1 / L1≤h2 / L2≤h3 / L3. h1, h2, and h3 are the protrusion heights of the first step, second step, and 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 adjacent step on 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 multiple protruding steps, and W is the orthogonal projection height 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 this embodiment, the sum of the heights of the multiple protruding steps is less than one-third of the projected height of the windward surface 43 of the heat exchanger 40 along the direction from the cross-flow fan 30 to the heat exchanger 40. This ensures the flow area of ​​the air duct 21 and prevents the flow area of ​​the air duct 21 corresponding to the steps from being too small, which would increase airflow resistance and affect air volume. Here, when the step structure is located on the top or bottom wall, the height refers to the vertical direction; when the step structure is located on the side wall of the air duct, W refers to the length of the projected height 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 is positively correlated with W / D, where H is the sum of the heights of multiple steps, W is the orthogonal projection height 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 duct 21 corresponding to the step closest to the cross-flow fan 30. In this embodiment, 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 return airflow. The higher the step height, the better it can block the return airflow and improve the noise reduction effect. When the size of the indoor unit is fixed or changes little, the height of the duct 21 changes little. The heat exchange capacity is adjusted by adjusting the shape or size of the heat exchanger. When the windward surface of the heat exchanger increases, the height of the step also increases accordingly to improve the noise reduction effect and stabilize the airflow field. Here, when the stepped structure is located on the top or bottom wall, the height refers to the vertical direction. 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 step closest to the cross-flow fan 30 in the left and right direction.

[0218] Optionally, the steps are inclined away from the center of the airflow duct, along the direction of airflow. This buffers the contact surface between the airflow and the steps, preventing violent airflow collisions.

[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 toward the heat exchanger 40. The second connecting plate connects the end of the first connecting plate toward the heat exchanger 40 and the upper end of the heat exchanger 40. The second connecting plate is configured with a noise reduction structure, including a stepped structure 23; and / or, the first connecting plate is inclined downwards along the flow direction of the airflow within the air duct 21.

[0220] In this embodiment, 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. This can prevent the height of the second connecting plate connected to the first connecting plate from being too high. This makes it easier to set a noise reduction structure on the second connecting plate. The second connecting plate is located downstream of the air duct 21, where airflow is prone to accumulate and generate noise. Setting a noise reduction structure 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 can be detachably connected. This not only facilitates the disassembly of the air duct component 20, but also, because the second connecting plate has a stepped structure 23, allows the second connecting plate to be replaced as needed to adapt to different indoor units, thereby improving the noise reduction effect.

[0222] Optionally, the duct component 20 includes a duct section and a noise reduction section. The noise reduction section includes a second connecting plate, and the duct section includes a first connecting plate. The duct section encloses the outlet fan cavity 211 and the diffuser cavity 212, and the second connecting plate encloses the outlet fan cavity 211. The duct section is an integral structure. This facilitates the installation of the duct component 20, and the duct section has no gaps, preventing airflow loss and abnormal noise, further reducing noise and ensuring airflow performance.

[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 within the projection of the first heat exchange section 41 along the height direction of the indoor unit.

[0224] In this embodiment, since the first heat exchange section 41 is inclined, the length of the air duct 21 at the end of the first heat exchange section 41 near the air outlet 12 is greater than the length of the air duct 21 at the end of the first heat exchange section 41 away from the air outlet 12. The stepped structure 23 corresponds to the windward surface 43 of the first heat exchange section 41. The stepped structure 23 can be closer to the heat exchanger 40, which improves the blocking effect on the return airflow and improves the noise reduction effect.

[0225] Optionally, when the noise reduction structure includes the stepped structure 23, the horizontal distance between the end of the stepped structure 23 near the heat exchanger 40 and the windward surface 43 of the heat exchanger 40 is less than the shortest horizontal distance between the end of the stepped structure 23 near the heat exchanger 40 and the outer peripheral wall of the cross-flow fan 30.

[0226] In this embodiment, the stepped structure 23 is closer to the heat exchanger 40. Since the heat exchanger 40 is located at the end of the air duct 21, the end of the air duct 21 is prone to airflow accumulation and backflow. Therefore, the end of the stepped structure 23 facing the heat exchanger 40 should be close to the heat exchanger 40. This can improve the blocking effect on the backflow airflow, force the airflow inside the air duct 21 to be smooth, reduce noise and stabilize the airflow field.

[0227] Optionally, the stepped structure 23 is positioned near the heat exchanger 40 at one end facing the heat exchanger, which can prevent airflow backflow to the greatest extent and reduce noise in the air duct 21.

[0228] Optionally, such as Figure 10 , Figure 13 and Figure 14 As shown, an exhaust channel 24 is provided on the side wall of the air duct 21. The exhaust channel 24 connects the outside of the air duct 21 and the inside of the air duct 21. The noise reduction structure includes the exhaust channel 24.

[0229] In this embodiment, due to the high resistance of the heat exchanger 40, vortices form at the air outlet 12 of the duct 21 after the airflow encounters resistance at the end of the duct 21, causing internal turbulence and affecting both airflow volume and noise levels. An exhaust channel 24 is provided on the side wall of the duct 21. The exhaust channel 24 can discharge the airflow within the duct 21, eliminating airflow vortices and forcing smooth internal airflow, thus reducing noise within the duct 21. Furthermore, the exhaust channel 24 can discharge airflow vortices within the duct, stabilizing the internal airflow field and ensuring the airflow volume of the indoor unit. Figure 23-1 and Figure 23-2 As shown, when there is no exhaust channel in the air duct, such as Figure 23-1 As shown, there is a noticeable swirling airflow within the duct, which can cause abnormal noise and airflow loss. When installing exhaust channels within the duct, such as... Figure 23-2 As shown, the airflow vortex within the duct disappears and is exhausted to the outside of the duct, resulting in smoother airflow, increased air volume, and reduced or even eliminated noise. This eliminates the need for additional components for noise reduction, resulting in low cost, simplicity, and high reliability.

[0230] Optionally, at least one of the left and right walls of the air duct 21 is provided with an 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 this embodiment, the heat exchanger 40 is located at the end of the air duct 21. Therefore, the airflow resistance is greater in the air duct 21 near the heat exchanger 40, and more vortices are formed. The exhaust channel 24 is located closer to the heat exchanger 40, which can better discharge the vortices in the air duct 21, force the airflow in the air duct 21 to be smooth, reduce the noise in the air duct 21 and stabilize the airflow field.

[0232] Optionally, the exhaust passage 24 includes an exhaust grille 241, which is elongated and located on the upper and lower sides of the centerline of the air duct 21 at both ends in the height direction.

[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 exhaust grille 241 or multiple 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 arrows indicate the flow direction of airflow in the first and second return air channels. A first return air channel 292 is defined between the housing and the duct component 20, connecting the exhaust channel 24 and the air inlet 11, so that the airflow from the exhaust channel 24 can flow through the first return air channel to the air inlet 11; and / or, the duct component 20 defines a second return air channel 293, connecting the exhaust channel 24 and the air inlet 11, so that the airflow from the exhaust channel 24 can flow through the second return air channel to the air inlet 11. In this embodiment, the airflow discharged from the exhaust channel 24 flows back to the air inlet 11 through the first return air channel 292 and / or the second return air channel 293. Here, both the first and second return air channels are located inside the housing, that is, the airflow in the duct 21 from the exhaust channel 24 does not flow into the environment outside the housing, but returns to the air inlet inside the housing for recirculation. Since the indoor unit is located inside the ceiling, the space inside the ceiling is relatively enclosed. The airflow of the exhaust channel 24 will not be discharged to the outside of the indoor unit, that is, it will not enter the ceiling. This will not affect the pressure inside the ceiling, nor will it cause airflow turbulence inside the ceiling, which would cause dust to fly. The dust inside the ceiling will not enter the air duct 21 through the exhaust channel 24, thus preventing dust from entering the air duct 21 and affecting the operation of the fan, thereby ensuring the normal operation of the indoor unit.

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

[0240] In this embodiment, the side plate 14 and the left side wall of the air duct component 20 and / or the right side wall of the air duct 21 can directly enclose the first return air channel, so that the side plate 14 can prevent the airflow from the exhaust channel 24 from flowing to the outside of the casing.

[0241] Optionally, when the air duct component 20 defines the second return air passage, the air duct component 20 includes an air duct component body and an air duct side plate 29. The air duct component body defines the air passage 21. The air duct side plate 29 is connected to the air duct component body and is located outside the exhaust passage 24. The air duct side plate 29 and the air duct component body enclose the second return air passage.

[0242] In this embodiment of the present disclosure, the air duct component 20 itself can also define a second return air passage. The air duct side plate 29 is located outside the exhaust passage 24. In this way, when there are other components between the air duct component 20 and the side plate 14, the air duct side plate 29 can prevent the airflow of the exhaust passage 24 from flowing to other components, and can ensure that the airflow 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 to the heat exchanger 40 is located on the side of the air duct side plate 29 away from the air duct body. In this way, the air duct side plate 29 can prevent the airflow from the exhaust channel 24 from exchanging heat with the refrigerant pipe 54, and prevent the temperature change of the refrigerant medium in the refrigerant pipe 54 from affecting the normal operation of the indoor unit.

[0244] Optionally, the area of ​​the exhaust channel 24 corresponding to the heat exchange chamber 213 is larger than the area of ​​the exhaust channel 24 corresponding to the diffuser chamber 212.

[0245] In this embodiment, the heat exchange chamber 213 is located at the end of the air duct 21, and the area of ​​the exhaust channel 24 of the heat exchange chamber 213 is larger than the area of ​​the exhaust channel 24 of the diffuser chamber 212. This can improve the exhaust effect of the heat exchange chamber 213 and thus ensure the noise reduction effect.

[0246] Optionally, the air duct component 20 includes side air duct plates, with two side air duct plates located on the left and right sides of the air duct 21. The left side wall of the air duct includes a left air duct plate, and the right side wall of the air duct includes a right air duct plate. The side air duct plates are configured with a noise reduction structure, which includes an exhaust channel 24.

[0247] Optionally, such as Figure 6 As shown, the air duct 21 is also provided with guide ribs 80, which are located on the inner wall of the air duct 21. Each guide rib 80 includes a first guide rib 81, and the number of first guide ribs 81 can be one or more, with at least one first guide rib 81 located in the middle of the length of the air duct. When air flows through the air duct 21 to the first guide rib 81, the first guide rib 81 can rectify the airflow, making the airflow within the air duct 21 approximately uniformly distributed along the length of the air duct. This stabilizes the position of the eccentric vortex, prevents eccentric vortex movement, avoids backflow, and thus reduces noise. Furthermore, the method of setting the first guide rib 81 is low-cost and easy to implement. Figure 6 The middle arrow indicates the length direction of the air duct 21.

[0248] Optionally, there may be multiple first guide ribs 81, which are arranged sequentially along the length of the air duct 21. The more uniformly the first guide ribs 81 are distributed along the length of the air duct 21, the better the rectification effect. Specifically, the multiple first guide ribs 81 are located on opposite sides of the at least one first guide rib 81 and / or the distance between two adjacent first guide ribs 81 is greater than or equal to 30 mm and less than or equal to 120 mm. Here, a distance of less than 30 mm between two adjacent first guide ribs 81 would be too dense, increasing airflow resistance, while a distance of more than 120 mm would degrade the rectification effect.

[0249] Optionally, the guide ribs 80 extend along the airflow direction within the air duct 21. This facilitates guiding airflow and achieving rectification.

[0250] Optionally, the guide rib 80 includes a first end and a second end arranged sequentially along the airflow direction. Along the airflow direction within the air duct 21, the first end is inclined towards the center of the air duct 21 and / or the second end is inclined away from the center of the air duct 21. This reduces the resistance of the ends of the guide rib 80 to the airflow.

[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 are provided with first guide ribs 81. In this way, the air duct 21 can rectify the airflow in both the vertical and horizontal directions.

[0252] Optionally, the first guide rib 81 on the inner wall of the upper air duct plate and the first guide rib 81 on the inner wall of the lower air duct plate 263 are staggered to further improve the rectification effect.

[0253] Optionally, the guide rib 80 further includes a second guide rib 82, which is provided on the inner wall surface of the left side wall and / or the inner wall surface of the right side wall of the air duct 21. In this way, the air duct 21 can also rectify the airflow in the left and right directions.

[0254] Optionally, the second guide rib 82 is provided on the wall of the exhaust grille 241 facing the air duct 21, and the second guide rib 82 is connected between multiple exhaust grilles 241. In this way, the second guide rib 82 can not only play a rectification role, but also improve the strength of the exhaust grille 241, thereby ensuring the strength of the air duct component 20.

[0255] Optionally, such as Figures 19 to 21 As shown, the volute tongue 27 includes a first section 273 and a second section 274. Along the airflow direction within the duct 21, the first section 273 and the second section 274 are arranged sequentially, and the connection between the first section 273 and the second section 274 forms a bend towards the axis of the duct 21. The volute tongue 27 is detachably connected to the duct component. This facilitates the production and processing of the duct component 20 and reduces costs.

[0256] Optionally, the volute 27 can be engaged with the air duct component for easy operation.

[0257] Optionally, the second section 274 of the volute tongue 27 is provided with a pressure relief hole 271. With the pressure relief hole 271 in the second section 274, the high-pressure vortex within the air duct 21 can be discharged through the pressure relief hole 271, achieving pressure relief and making the airflow within the entire air duct 21 relatively smooth. The position of the eccentric vortex also becomes relatively stable, reducing turbulence and thus reducing noise. The first section 273 does not have a pressure relief hole 271; the pressure relief hole 271 is located in the second section 274. This not only achieves pressure relief but also prevents air from the air duct 21 from being discharged through the first section 273, thus avoiding affecting the airflow of the indoor unit.

[0258] Optionally, the distance between the pressure relief hole 271 and the bend is greater than or equal to 5 mm and less than or equal to 15 mm. If the distance between the pressure relief hole 271 and the bend is less than 5 mm, the distance is too far from the heat exchanger 40, resulting in an insignificant pressure relief effect. If the distance between the pressure relief hole 271 and the bend is greater than 15 mm, given a fixed size of the volute tongue 27, the area on the second section 274 where the pressure relief hole 271 can be installed will be limited, and the total opening area of ​​the pressure relief hole 271 will not meet the requirements.

[0259] Optionally, the second segment 274 includes a pressure relief region and a non-pressure relief region. Along the length of the volute tongue 27, the pressure relief region and the non-pressure relief region are arranged alternately, with a pressure relief hole 271 located in the pressure relief region. When the airflow in the duct 21 impacts the volute tongue 27, the airflow reaches the pressure relief region and the non-pressure relief region at different times, effectively avoiding the resonance peak caused by the superposition of pulsations in the same frequency range, thereby reducing the noise level.

[0260] Optionally, each pressure relief area is provided with a plurality of pressure relief holes 271, with at least two pressure relief holes 271 arranged sequentially along the length direction of the volute tongue 27 and / or at least two pressure relief holes 271 arranged sequentially along the flow direction of the airflow in the air duct 21.

[0261] Optionally, the volute tongue 27 is disposed on the upper wall 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 hook 275, which engages with the pressure relief channel 272. In this way, the pressure relief channel 272 can both make the volute tongue 27 detachable and facilitate pressure relief.

[0263] Optionally, the volute tongue 27 and the lower air duct plate 263 define a silencing cavity 276, which is connected to the pressure relief hole 271. In this way, the pressure relief hole 271 can not only relieve pressure, but the pressure relief hole 271 and the silencing cavity 276 can also form a Helmholtz resonance silencing cavity 276.

[0264] Here, the silencing cavity 276 is a closed structure. When the frequency of the incident sound wave in the silencing cavity 276 is close to the natural frequency of the resonator formed by the silencing cavity 276 and the pressure relief hole 271, the air column at the pressure relief hole 271 vibrates strongly. During the vibration process, sound energy is consumed due to overcoming frictional resistance, thereby achieving sound absorption.

[0265] This disclosure also provides an air conditioner, which includes an indoor unit as described in any of the above embodiments.

[0266] The air conditioner provided in this disclosure includes the indoor unit of any of the above embodiments, and therefore has the beneficial effects of the indoor unit of any of the above embodiments, which will not be repeated here.

[0267] An air conditioner also includes an outdoor unit, which is connected to the indoor unit via refrigerant pipes, forming a refrigerant circulation loop. Optionally, the indoor unit can be a ducted unit or other types of air conditioners.

[0268] The foregoing description and accompanying drawings fully illustrate embodiments of the present disclosure to enable those skilled in the art to practice them. Other embodiments may include structural and other changes. The embodiments represent only possible variations. Individual components and functions are optional unless explicitly required, and the order of operation may vary. Parts and features of some embodiments may be included or substituted for parts and features of other embodiments. Embodiments of the present disclosure are not limited to the structures described above and shown in the accompanying drawings, and various modifications and changes may be made without departing from its scope. The scope of the present disclosure is limited only by the appended claims.

Claims

1. An indoor unit, characterized by, include: The housing defines a cavity with an air inlet and an air outlet; The heat exchanger is located inside the housing cavity; A cross-flow fan and a heat exchanger are sequentially arranged in the receiving cavity along the direction from the air inlet to the air outlet. The air duct component is located within the receiving cavity and defines the air duct, which connects the cross-flow fan and the heat exchanger. The air duct has a noise reduction structure.

2. The indoor unit according to claim 1, characterized in that, Part of the wall of the air duct protrudes inward to form a stepped structure. The stepped structure is used to prevent airflow backflow in the air duct. The noise reduction structure includes the stepped structure. And / or, the side wall of the air duct has an exhaust channel. The exhaust channel connects the outside of the air duct and the inside of the air duct. The noise reduction structure includes the exhaust channel.

3. The indoor unit according to claim 2, characterized in that, When the noise reduction structure includes a stepped structure, the stepped structure includes one or more steps. When the stepped structure includes multiple steps, the height of the multiple steps gradually increases along the direction from the heat exchanger to the cross-flow fan.

4. The indoor unit of claim 3, characterized in that, Multiple steps include: First step; The second step is located on the side of the first step facing the cross-flow fan; The third step is located on the side of the second step facing the cross-flow fan; 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 there are multiple steps, the steps extend in a stepped manner, and the multiple steps include: The fourth step; The fifth step is located adjacent to the fourth step and on the side of the fourth step facing the cross-flow fan; Where h4 / L4 ≤ h5 / L5, h4 is the height of the fourth step protrusion, 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 adjacent step on 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 protrusion, 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; and / or, Along the direction of airflow within the duct, the steps slope away from the center of the duct.

6. The indoor unit according to claim 3, characterized in that, H / W ≤ 1 / 3, where H is the sum of the heights of the multiple protruding steps, and W is the projected height of the heat exchanger's windward side along the direction from the cross-flow fan to the heat exchanger; and / or, H / W is positively correlated with W / D, where H is the sum of the heights of the multiple protruding steps, W is the orthogonal projection height of the heat exchanger's windward surface along the direction from the cross-flow fan to the heat exchanger, and D is the height of the duct corresponding to the step closest to the cross-flow fan.

7. The indoor unit of claim 3, characterized in that, The ventilation duct components include: The first connecting plate has one end corresponding to the cross-flow fan; The second connecting plate has one end corresponding to the other end of the first connecting plate, and the other end of the second connecting plate is connected to the heat exchanger. The second connecting plate has a stepped structure. One end of the second connecting plate is connected to the other end of the first connecting plate on the side away from the center of the air duct, and a step is formed at the connection between the one end of the second connecting plate and the other end of the first connecting plate.

8. The indoor unit according to any one of claims 2 to 7, characterized in that the heat exchanger include: The first heat exchange section is a straight plate and is inclined upward or downward along the flow direction of the airflow in the duct. Wherein, the stepped structure corresponds to the windward side of the first heat exchange section, and along the height direction of the indoor unit, at least a portion of the projection of the stepped structure lies within the projection of the first heat exchange section; and / or, When the noise reduction structure includes a stepped structure, the horizontal distance between the end of the stepped structure near the heat exchanger and the windward side of the heat exchanger is less than the shortest horizontal distance between the end of the stepped structure near 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 includes an exhaust duct, at least one of the left and right walls of the duct is provided with an exhaust duct, and the distance between the center of the exhaust duct and the heat exchanger is less than the distance between the center of the exhaust duct and the cross-flow fan.

10. The indoor unit according to claim 9, characterized in that, The exhaust channel includes an exhaust grille, which is elongated and located at its two ends along the vertical direction above and below the centerline of the duct; and / or, The exhaust passage includes one or more exhaust grilles arranged side by side, the exhaust grilles are inclined and have an angle with the horizontal direction.

11. The indoor unit according to claim 10, characterized in that, When the exhaust grille is tilted, the angle between the exhaust grille and the horizontal direction is within the range of 50°≤a≤90°; and / or The exhaust grille is set parallel to the heat exchanger.

12. The indoor unit according to claim 9, characterized in that, A first return air passage is defined between the housing and the air duct components, connecting the exhaust passage and the air inlet, so that the airflow from the exhaust passage can flow through the first return air passage to the air inlet; and / or, The ductwork defines a second return air passage that connects the exhaust passage and the air inlet, so that the airflow from the exhaust passage can flow through the second return air passage to the air inlet.

13. The indoor unit of claim 12, characterized in that, When the first return air passage is defined between the housing and the air duct components, the housing includes: Side panel, located outside the left and / or right side walls of the air duct, the side panel and the left and / or right side walls of the air duct enclose a first return air passage; and / or, When the air duct component defines the second return air passage, the air duct component includes: The air duct component itself limits the airflow duct; The air duct side plate is connected to the air duct component body and is located outside the exhaust channel. The air duct side plate and the air duct component body enclose the second return air channel.

14. The indoor unit according to any one of claims 2, 9 to 13, characterized in that, The air duct includes a fan chamber, a diffuser chamber, and a heat exchange chamber that are connected sequentially along the airflow direction. The cross-flow fan is located in the fan chamber, and the heat exchanger is located in the heat exchange chamber. Both the diffuser chamber wall and the heat exchange chamber wall are provided with exhaust channels, and the area of ​​the exhaust channel corresponding to the heat exchange chamber is larger than the area of ​​the exhaust channel corresponding to the diffuser chamber.

15. An air conditioner characterized by comprising: Including the indoor unit as described in any one of claims 1 to 14.

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