Air duct assembly, indoor unit, and heating and ventilation system

Abstract

An air duct assembly (10), an indoor unit (1), and a heating and ventilation system. The air duct assembly (10) is applied to the indoor unit (1); the indoor unit (1) comprises a fan (91) and a heat exchanger (92); and the air duct assembly (10) comprises a first housing (20) and a second housing (30), wherein the first housing (20) and the second housing (30) cooperate with each other to define a diffuser chamber (12) and a heat exchange chamber (13), which are in communication with each other, the diffuser chamber (12) being configured to be in communication with an air output side of the fan (91) and guide air to flow to the heat exchange chamber (13), the heat exchange chamber (13) being configured to accommodate the heat exchanger (92), and the diffuser chamber (12) being located on one side of the heat exchange chamber (13).

Description

Duct components, indoor units, and HVAC systems

[0001] This application claims priority to the Chinese patent application filed with the China Patent Office on January 11, 2024, with application number 2024100462733 and invention name “Duct assembly, indoor unit and HVAC system”, and the Chinese patent application filed with the China Patent Office on January 2, 2025, with application number 2025100082141 and invention name “Duct assembly, indoor unit and HVAC system”, the entire contents of which are incorporated by reference into this application. Technical Field

[0002] The present application relates to the field of HVAC technology, and in particular to an air duct assembly, an indoor unit, and a HVAC system. Background Art

[0003] The HVAC system includes an indoor unit with an air duct assembly that forms an air duct. The air duct assembly has a pressure diffuser chamber and a heat exchange chamber. The pressure diffuser chamber receives and diffuses the airflow from the indoor unit's fan, while the heat exchange chamber houses a heat exchanger.

[0004] In the related art, the air flow blown out by the fan has poor gas flow performance in the above-mentioned air duct, resulting in large noise during air supply and poor air supply effect, which greatly affects the user experience. Summary of the Invention

[0005] The present invention provides an air duct assembly, an indoor unit and an air duct unit, which can improve the air supply effect.

[0006] In a first aspect, embodiments of the present application provide an air duct assembly for an indoor unit, the indoor unit including a fan and a heat exchanger. The air duct assembly includes a first shell and a second shell, the first shell and the second shell cooperating to define a communicating pressure diffuser chamber and a heat exchange chamber, the pressure diffuser chamber being configured to communicate downstream of the fan and guide air flow toward the heat exchange chamber, and the heat exchange chamber being configured to accommodate the heat exchanger.

[0007] Wherein, the pressure diffusion chamber is located on one side of the heat exchange chamber.

[0008] In one embodiment, the air duct assembly between the pressure diffuser and the heat exchanger does not form an obstruction in the flow direction of the airflow toward the heat exchanger.

[0009] In one embodiment, the pressure diffusion chamber does not extend into the heat exchange chamber.

[0010] In one embodiment, the transverse flow area of ​​the gas in the pressure diffusion chamber is increased along the direction from the pressure diffusion chamber to the heat exchange chamber, and the transverse flow area of ​​the gas from the pressure diffusion chamber to the heat exchange chamber remains unchanged or increases.

[0011] In one embodiment, the pressure diffusion chamber is arranged to expand gradually along the direction from the pressure diffusion chamber to the heat exchange chamber.

[0012] In one embodiment, the first shell includes a pressure diffuser chamber upper shell and a heat exchange chamber upper shell, the pressure diffuser chamber upper shell defines a cavity top wall of the pressure diffuser chamber, and the heat exchange chamber upper shell defines a cavity top wall of the heat exchange chamber; the second shell includes a pressure diffuser chamber lower shell and a water receiving tray, the pressure diffuser chamber lower shell defines a cavity bottom wall of the pressure diffuser chamber, and the water receiving tray defines a cavity bottom wall of the heat exchange chamber;

[0013] The upper shell of the pressure diffusion chamber is connected to the upper shell of the heat exchange chamber, and the lower shell of the pressure diffusion chamber is connected to the water receiving pan. On the upstream side of the heat exchange chamber, the upper shell of the heat exchange chamber is extended upward relative to the upper shell of the pressure diffusion chamber, and / or, on the upstream side of the heat exchange chamber, the water receiving pan is extended downward relative to the lower shell of the pressure diffusion chamber, so as to increase the gas flow area.

[0014] In one embodiment, the upper shell of the pressure diffusion chamber is inclined upward in a direction away from the upper shell of the heat exchange chamber, and the upper shell of the heat exchange chamber includes a connected shell top wall and a shell side wall, the shell side wall is connected between the upper shell of the pressure diffusion chamber and the shell top wall, and the shell side wall is extended upward.

[0015] In one embodiment, the lower shell of the pressure diffuser chamber is inclined upward in a direction away from the water receiving tray, and the lower shell of the pressure diffuser chamber and the water receiving tray are smoothly transitioned.

[0016] In one embodiment, the water receiving tray includes a tray bottom wall and a tray side wall, the tray side wall is connected between the lower shell of the diffuser chamber and the tray bottom wall, and an angle greater than or equal to 90 degrees is formed between the lower shell of the diffuser chamber and the tray side wall.

[0017] In one embodiment, the first shell includes a pressure diffuser chamber upper shell and a heat exchange chamber upper shell, the pressure diffuser chamber upper shell defines a cavity top wall of the pressure diffuser chamber, and the heat exchange chamber upper shell defines a cavity top wall of the heat exchange chamber; the second shell includes a shell body and a water receiving tray, the shell body defines at least a portion of a cavity bottom wall of the pressure diffuser chamber, and the water receiving tray defines a cavity bottom wall of the heat exchange chamber;

[0018] Wherein, the pressure diffuser chamber upper shell and the heat exchange chamber upper shell are integrally formed components, and / or the shell body and the water receiving tray are integrally formed components.

[0019] In one embodiment, the first shell and the second shell further cooperate to define an air inlet cavity, the air inlet cavity is configured to accommodate the fan, and the downstream side of the air inlet cavity is connected to the pressure diffuser cavity;

[0020] The first shell includes a pressure diffuser chamber upper shell, a heat exchange chamber upper shell, an air inlet chamber upper shell and an air inlet chamber rear shell. The pressure diffuser chamber upper shell, the heat exchange chamber upper shell, the air inlet chamber upper shell and the air inlet chamber rear shell are integrally formed components.

[0021] In one embodiment, the first shell and the second shell further cooperate to define an air inlet cavity, the air inlet cavity is configured to accommodate the fan, and the downstream of the air inlet cavity is connected to the pressure diffuser cavity;

[0022] The air duct assembly also includes a volute tongue arranged at the junction of the air inlet chamber and the pressure diffuser chamber. The volute tongue is configured to guide the airflow from the air inlet chamber to the pressure diffuser chamber, and a plurality of guide grooves are provided at intervals on the side of the volute tongue facing the air inlet chamber. The guide grooves extend from the air inlet chamber to the pressure diffuser chamber.

[0023] In one embodiment, the volute tongue comprises:

[0024] a volute tongue body having a main body face; and

[0025] A plurality of guide ribs are protruded on the main body surface at intervals along the length direction of the air duct assembly, and the guide groove is jointly defined between two adjacent guide ribs and the main body surface.

[0026] In one embodiment, projected along the length direction of the air duct assembly, the main surface portion of the groove bottom of the guide groove constitutes the groove bottom profile line, and the end point of the contour line of the guide rib extending toward the lower shell of the diffuser cavity intersects with the groove bottom profile line.

[0027] In one embodiment, the connection between the two ends of the guide rib and the main body surface is a smooth transition;

[0028] And / or, the contour line shape of the guide rib is configured to be wavy, broken line, or a single arc shape that bulges away from the volute tongue body.

[0029] In one embodiment, the second housing includes a first split structure and a second split structure, the first split structure and the second split structure are detachably connected, and the first split structure and the second split structure cooperate to form a bottom wall of the pressure diffuser cavity and a portion of an inner wall of the air inlet cavity;

[0030] Part of the second split structure forms the snail tongue.

[0031] In one embodiment, the first split structure includes:

[0032] Shell body; and

[0033] a support portion connected to one side of the shell body and detachably connected to the second split structure, wherein the support portion, the shell body, and the second split structure cooperate to form a bottom wall of the pressure diffuser cavity;

[0034] Wherein, the support structure and the shell body are an integrated structure, and / or the second split structure and the support portion are enclosed to form a hollow cavity.

[0035] In one embodiment, the first housing and the second housing further cooperate to define an air inlet cavity communicating with the pressure diffuser cavity, and the air inlet cavity is configured to accommodate the fan;

[0036] The second shell includes a return channel, a first surface constituting the bottom wall of the diffusion chamber, and a second surface constituting a portion of the wall surface of the air inlet chamber. The first surface is provided with a first opening, the second surface is provided with a second opening, and the return channel extends from the first opening to the second opening.

[0037] In one embodiment, the reflux channel is arranged in a curved shape;

[0038] And / or, the width of the reflux channel remains unchanged or gradually expands from the first opening to the second opening.

[0039] In one embodiment, the return channel passes through the fan at an extension line of the second opening, and an angle θ between the return channel and a tangent line of the outer periphery of the fan is less than or equal to 15 degrees and greater than or equal to 0 degrees.

[0040] Alternatively, the return channel extends from the outside of the fan at the direction of the second opening and forms an angle β with the peripheral tangent of the fan, and the angle β is less than or equal to 45 degrees and greater than or equal to 0 degrees.

[0041] In one embodiment, the angle θ is equal to 0 degrees or the angle β is equal to 0 degrees, so that the extension line of the return flow channel at the second opening coincides with the tangent line of the outer periphery of the fan.

[0042] In one embodiment, the second housing comprises:

[0043] a shell body, wherein the shell body is provided with the first surface;

[0044] a supporting portion, the supporting portion being connected to a side of the shell body facing away from the first surface, and one side of the supporting portion being configured as a first return air surface; and

[0045] The guide member is connected to the side of the shell body facing away from the first surface and is spaced apart from the support portion. The side of the guide member facing the support portion is constructed as a second return air surface. The second return air surface and the first return air surface cooperate to form the return flow channel. The second surface is provided at the end of the guide member away from the shell body.

[0046] In one embodiment, the flow guide includes a connecting portion, a flow guide portion and a cavity wall portion. The connecting portion is stacked on the side of the shell body facing away from the first surface and can be detachably installed on the shell body. The flow guide portion is connected to the connecting portion and is arranged at an angle to the connecting portion. The cavity wall portion is connected to one end of the flow guide portion facing away from the connecting portion and extends in a direction away from the shell body. The cavity wall portion is arranged at an angle to the flow guide portion, and the cavity wall portion has the second surface. The first shell at least defines the air inlet cavity with the cavity wall portion.

[0047] In one embodiment, a grille is further included, which is detachably connected to the cavity wall portion and covers the air inlet side of the air inlet cavity.

[0048] In the second aspect, an embodiment of the present application also proposes an indoor unit, comprising a fan, a heat exchanger and an air duct assembly as described in any one of the above items, wherein the first shell and the second shell also cooperate to define an air inlet cavity connected to the pressure diffusion cavity, the fan is accommodated in the air inlet cavity, and the heat exchanger is accommodated in the heat exchange cavity.

[0049] In one embodiment, the indoor unit is a duct unit, and the fan is a cross-flow fan.

[0050] In one embodiment, the first shell and the second shell are further configured to form an air outlet connected to the heat exchange cavity, and the heat exchanger is arranged in an arc shape arched toward the air outlet, wherein the central axis of the pressure diffusion cavity passes through the arc top of the heat exchanger.

[0051] In one embodiment, the heat exchanger is provided with a plurality of refrigerant pipes perpendicular to the air outlet direction, and along the vertical direction of the installation environment, the number of refrigerant pipes in the middle of the heat exchanger is greater than the number of refrigerant pipes at the upper and lower ends of the heat exchanger;

[0052] And / or, the air outlet is oriented horizontally.

[0053] In one embodiment, the first shell and the second shell further cooperate to define an air suction port communicating with the air inlet cavity, and the air suction port is at least partially directed downward.

[0054] In one embodiment, the indoor unit further includes:

[0055] The electric control box is installed outside the second shell, and part of the air suction port is located between the fan and the electric control box.

[0056] In a third aspect, an embodiment of the present application proposes a HVAC system, comprising an outdoor unit and an indoor unit as described above, wherein the outdoor unit and the heat exchanger form a refrigerant cycle.

[0057] In the embodiment of the present application, a pressure diffusion chamber is provided on one side of the heat exchange chamber. When the airflow flows in the pressure diffusion chamber along the direction from the pressure diffusion chamber to the heat exchange chamber, the flow rate of the gas gradually decreases, the dynamic pressure decreases, and while the dynamic pressure of the gas decreases, the static pressure of the gas increases, so that the static pressure of the gas is greater when it flows out of the air outlet, thereby effectively improving the static pressure level at the air outlet of the air duct assembly and increasing the air supply distance. In addition, the slowdown in the gas flow rate not only enables the gas to fully exchange heat with the heat exchanger when passing through the heat exchange chamber, thereby improving the heat exchange efficiency, but also because the flow rate is reduced, the noise during air supply will also be effectively reduced, and the air supply quality will be improved. In the technical solution of the present application, the air supply distance of the indoor unit is increased, the noise is reduced, and the air supply quality is better, thereby improving the air supply effect and improving the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0058] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the following briefly introduces the drawings required for use in the embodiments or the description of the prior art. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on the structures shown in these drawings without paying any creative work.

[0059] FIG1 is a schematic structural diagram of an indoor unit according to an embodiment of the present application;

[0060] FIG2 is an exploded structural diagram of the indoor unit in FIG1 ;

[0061] FIG3 is a front view of the indoor unit in FIG1 ;

[0062] FIG4 is a schematic cross-sectional view of the indoor unit at position AA in FIG3 ;

[0063] FIG5 is a top view of the internal structure of an indoor unit according to an embodiment of the present application;

[0064] FIG6 is an exploded structural diagram of another embodiment of the indoor unit in FIG1 ;

[0065] FIG7 is a schematic cross-sectional view of the indoor unit at position BB in FIG3 ;

[0066] FIG8 is a schematic diagram of a partial structure of an embodiment of the first housing of the present application;

[0067] FIG9 is a schematic structural diagram of an embodiment of a second housing of the present application;

[0068] FIG10 is a schematic structural diagram of the second housing in FIG9 at another angle;

[0069] FIG11 is a front view of the second housing in FIG9 ;

[0070] FIG12 is a cross-sectional view taken at CC in FIG11 ;

[0071] FIG13 is an exploded structural diagram of another embodiment of the indoor unit of the present application;

[0072] FIG14 is a structural diagram of another embodiment of the indoor unit of the present application;

[0073] FIG15 is a cross-sectional view of the portion DD shown in FIG14;

[0074] FIG16 is a partial schematic diagram of the cross-sectional view shown in FIG15;

[0075] FIG17 is a partial structural diagram of another embodiment of the second housing of the present application;

[0076] FIG18 is a partial enlarged view of point F in FIG17 ;

[0077] FIG19 is a schematic diagram of a partially exploded structure of the second housing shown in FIG17 ;

[0078] FIG20 is a schematic diagram of a partial structure of the second housing shown in FIG17 from a top view;

[0079] FIG21 is another cross-sectional structural diagram of the indoor unit at position AA in FIG3 ;

[0080] FIG22 is a partial cross-sectional enlarged view of the air duct assembly of the indoor unit of the present application;

[0081] FIG23 is a cross-sectional view of the air duct assembly of the present application;

[0082] FIG24 is a schematic structural diagram of the indoor unit of the present application after the first shell is disassembled;

[0083] FIG25 is a partial enlarged view of point I in FIG24;

[0084] FIG26 is a schematic diagram of a partial structure of the second housing of the air duct assembly of the present application;

[0085] FIG27 is a partial enlarged view of point N in FIG26;

[0086] FIG28 is a schematic structural diagram of the air guide portion of the air duct assembly of the present application;

[0087] FIG29 is a schematic diagram of the three-dimensional structure of the indoor unit provided in one embodiment of the present application from another perspective;

[0088] FIG30 is an exploded view of an indoor unit provided in one embodiment of the present application;

[0089] FIG31 is a schematic structural diagram of a partial structure of an indoor unit provided in one embodiment of the present application;

[0090] FIG32 is a cross-sectional view of a partial structure of an indoor unit provided in one embodiment of the present application;

[0091] FIG33 is a schematic diagram of the structure of an electric control box in an indoor unit provided in one embodiment of the present application;

[0092] FIG34 is an enlarged schematic diagram of the local structure at Q in FIG32;

[0093] FIG35 is an enlarged schematic diagram of the local structure at R in FIG32;

[0094] FIG36 is a schematic diagram of the connection structure between the second housing and the electric control box in the indoor unit provided in one embodiment of the present application;

[0095] Figure 37 is a structural schematic diagram of the positioning structure between the electronic control box and the lower shell of the pressure diffusion chamber in the indoor unit provided by one embodiment of the present application.

[0096] Explanation of the reference numerals: 1. Indoor unit; 101. Air duct inlet interface; 102. Air duct outlet interface; 10. Air duct assembly; 11. Air inlet cavity; 12. Diffuser cavity; 121. Diffuser section; 1211, first straight contour line; 13, heat exchange chamber; 131, front heat exchange chamber; 132, rear heat exchange chamber; 14, air inlet; 141, first return air inlet; 143, second return air inlet; 15, air outlet; 16, hollow cavity; 17, connecting port; 18, mounting chamber; 181, first side wall; 182, second side wall; 183, exposed opening; 20, first shell; 20a, cover; 21, upper shell of air inlet chamber; 22, upper shell of pressure diffuser chamber; 23, upper shell of heat exchange chamber; 231, shell top wall; 233, shell side wall; 24, first reinforcing rib; 25, air guide plate; 251, connecting portion; 253, guide portion; 26, rear shell of air inlet chamber; 30, second shell; 31, First split structure; 311, shell body; 312, support part; 312a, first return air surface; 3121, first connecting part; 3122, second connecting part; 32, second split structure; 321, first plate segment; 322, second plate segment; 323, third plate segment; 33, front shell of air inlet chamber; 40, volute tongue; 41, volute tongue body; 411, main body surface; 412, first windward segment; 413, first air guide segment; 414, first arc contour line; 42, guide rib; 423, second windward segment; 424, second air guide segment; 425, second arc contour line; 426, second straight contour line; 43, guide groove; 431, groove bottom profile; 45, concave cavity; 46, Intersection line; 34, first surface; 35, second surface; 36, return flow channel; 37, first opening; 38, second opening; 39, pipe section; 391, first connecting plate; 392, second connecting plate; 393, through hole; 50, flow guide; 51, connecting portion; 52, flow guide portion; 521, second return air surface; 522, positioning opening; 53, cavity wall; 531, fixing slot; 55, flow guide rib; 551, third surface; 552, fourth surface; 553, block; 60, water receiving tray; 60a, tray bottom wall; 60b, tray side wall; 61, water receiving portion; 611, water receiving trough; 612, overlapping boss; 62, drainage portion; 621, water storage groove; 62 2. Drain pipe; 623. Water pump mounting block; 70. Side panel; 80. Insulation layer; 81. Upper insulation layer; 83. Lower insulation layer; 83. Sheet metal; 91. Fan; 91a. Air inlet side; 91b. Air outlet side; 911. Impeller; 913. Motor; 92. Heat exchanger; 921. Refrigerant pipe; 93. Electric control box; 93a. Accommodation cavity; 93b. Positioning column; 93c. Positioning slot; 931. Box body; 9317. Wire hole; 9318. Second heat dissipation hole; 932. Box cover; 9321. First heat dissipation hole; 9323. Electric control box guide portion; 9325. Electric control box guide surface; 933. Electric control board assembly; 98. Protective grille; 981. First grille portion;983, second grille section. ;

[0097] The realization of the objectives, functional features and advantages of this application will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0098] In order to make the purpose, technical solutions and advantages of this application clearer, the following part will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0099] When the following description refers to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The embodiments described in the following exemplary embodiments do not represent all embodiments consistent with the present application. Instead, they are merely examples of devices and methods consistent with some aspects of the present application, as detailed in the appended claims.

[0100] In the description of this application, it should be understood that the terms "first", "second", etc. are used for descriptive purposes only and should not be understood as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "multiple" refers to two or more. "And / or" describes the association relationship of associated objects, indicating that three relationships may exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. The character " / " generally indicates that the previous and subsequent associated objects are in an "or" relationship.

[0101] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the art to which this application belongs. The terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit this application. The term "and / or" as used herein includes any and all combinations of one or more of the relevant listed items.

[0102] 1 and 2 , an embodiment of the present application provides a HVAC system, which includes an indoor unit 1 and an outdoor unit. The indoor unit 1 and the outdoor unit are connected via cables, pipes, etc., so as to operate together to regulate the indoor environment.

[0103] In the present application, a vertical direction ZZ, a front-rear direction YY, and a left-right direction XX are defined, and the vertical direction ZZ, the front-rear direction YY, and the left-right direction XX are arranged to form an angle between each other.

[0104] As can be understood, the indoor unit 1 is installed indoors and is usually installed in the form of a suspended ceiling to supply air to the room. The indoor unit 1 includes an air duct assembly 10, a fan 91, a heat exchanger 92 and an electric control box 93.

[0105] The air duct assembly 10 is used to construct an air duct suitable for the indoor unit 1 for air flow. Specifically, the air duct assembly 10 is a structure mainly composed of a shell, and the outer contour of the air duct assembly 10 can be in a longitudinal shape.

[0106] 3 and 4 , the air duct assembly 10 is formed with an air inlet chamber 11, a pressure diffusion chamber 12, and a heat exchange chamber 13 that are sequentially connected, and is formed with an air suction port 14 connected to the air inlet chamber 11 and an air outlet 15 connected to the heat exchange chamber 13, so that gas can enter the air duct assembly 10 from the air suction port 14, and pass through the air inlet chamber 11, the pressure diffusion chamber 12, and the heat exchange chamber 13 in sequence, and finally flow out from the air outlet 15.

[0107] The fan 91 is arranged in the air inlet chamber 11, and is capable of extracting gas from the air intake 14 and performing work on it so that it flows to the pressure diffuser 12, thereby providing power for the gas circulation in the above-mentioned air duct. The fan 91 can be a cross-flow fan 91, a centrifugal fan 91 or an axial flow fan 91, etc. As shown in FIG5 , taking the cross-flow fan 91 as an example, the fan 91 includes an impeller 911 and a motor 913. The impeller 911 is arranged in a long cylindrical shape. The motor 913 is arranged at one end of the impeller 911 and is connected to the housing, and the output shaft of the motor 913 is connected to the impeller 911. One side of the impeller 911 in the circumferential direction is arranged roughly toward the air intake 14, and this side of the impeller 911 is defined as the air inlet side 91a; the other side of the impeller 911 in the circumferential direction, which is spaced apart from the air inlet side 91a, is arranged roughly toward the pressure diffuser 12, and this side of the impeller 911 is defined as the air outlet side 91b. Multiple blades are distributed along the circumference of the impeller 911. When the motor 913 drives the impeller 911 to rotate, the rotating blades can cause the gas to flow from the air inlet side 91a to the air outlet side 91b. Crossflow fans have the advantages of energy saving, large air volume, low noise, and simple installation. In conjunction with Figures 4 and 5, the heat exchanger 92 is housed in the heat exchange chamber 13 and is used to exchange heat with the gas flowing through the heat exchange chamber 13 and passing through the heat exchanger 92, thereby cooling or heating the gas. For example, multiple refrigerant pipes 921 are provided in the heat exchanger 92. When the gas passes through the heat exchanger 92, it exchanges heat with the refrigerant in the pipes, thereby changing the gas temperature. During cooling, the gas exchanges heat with the refrigerant in the heat exchanger 92 to form low-temperature air; during heating, the gas exchanges heat with the refrigerant in the heat exchanger 92 to form heated air. The shape of the heat exchanger 92 of the present application can be a variety of shapes, such as straight, V-shaped, curved, or wavy, as long as it can exchange heat with the gas.

[0108] An electric control panel assembly 933 is provided in the electric control box 93. The electric control panel assembly 933 integrates a variety of electronic components for electrically connecting to devices such as the fan 91 and for overall control of the overall operating status of the indoor unit 1. Inevitably, electronic components generate a significant amount of heat during operation. In the embodiment of the present application, the electric control box 93 can be provided within the air duct formed by the air duct assembly 10, or positioned close to the air duct, so that the air duct can dissipate heat from the electric control box 93 to a certain extent, thereby avoiding device operational failures or damage caused by overheating of the electric control panel assembly 933, improving the operational stability of the indoor unit 1, and extending its service life.

[0109] The following is an explanation of the relevant structure of the air duct assembly 10 with reference to the accompanying drawings. Referring to Figure 6, in some embodiments of the present application, in order to facilitate the assembly of the indoor unit 1, the shell includes a first shell 20 and a second shell 30. The first shell 20 is connected to the second shell 30 to form the above-mentioned shell. The first shell 20 and the second shell 30 can be respectively made of metal materials such as aluminum alloy or stainless steel to meet the requirements of high strength and corrosion resistance, or the first shell 20 and the second shell 30 can also be made of plastic materials to achieve lightweight shells, and the present application does not impose any restrictions on this. For example, the shell can be a combination of the first shell 20 being a metal material and the second shell 30 being a plastic material. In addition, the embodiments of the present application do not limit the connection method of the first shell 20 and the second shell 30, and they can be connected individually or in combination by means of snap-on, riveting, welding and bolt connection.

[0110] Specifically, referring to Figures 2 and 6 , the first housing 20 includes a cover 20a and two side panels 70. The two side panels 70 are spaced apart in the left-right direction XX, defining the width of the first housing 20. The cover 20a is generally disposed above the two side panels 70 and extends along the front-to-back direction YY. The cover 20a is connected to the two side panels 70 on either side of the left-right direction XX. Thus, the cover 20a and the two side panels 70 are assembled to form the shell-like first housing 20. Of course, the cover 20a and the side panels 70 can be integral or separate, and can be made of the same or different materials. They can be connected by means of snap-fitting, riveting, welding, bolting, etc., which will not be described in detail in this application. Correspondingly, the second shell 30 and the cover body 20a are spaced apart in the up-down direction ZZ, and are also extended along the front-back direction YY. The second shell 30 is arranged between the two side panels 70, and the second shell 30 is respectively connected to the two side panels 70 on both sides along the left-right direction XX. In this way, the first shell 20, the second shell 30 and the two side panels 70 are spliced ​​to form the above-mentioned shell.

[0111] Referring to Figures 6 and 7 , at least one of the first shell 20 and the second shell 30 forms the aforementioned air intake 14. That is, the air intake 14 can be provided in the first shell 20 or the second shell 30, or can be formed by the first shell 20 and the second shell 30. As shown in Figure 7 , from back to front along the front-to-back direction YY, the cover 20a includes a sequentially connected air inlet chamber rear shell 26, an air inlet chamber upper shell 21, a pressure diffuser chamber upper shell 22, and a heat exchange chamber upper shell 23. The second shell 30 includes a sequentially connected air inlet chamber front shell 33, a shell body 311, and a water receiving tray 60. The air inlet chamber rear shell 26 and the air inlet chamber front shell 33 are spaced apart in the front-to-back direction YY. The air inlet chamber rear shell 26, the air inlet chamber upper shell 21, the air inlet chamber front shell 33, and the side panels 70 define the air inlet chamber 11. The fan 91 is arranged in the air inlet cavity 11 and extends along the left and right direction XX. The air inlet cavity 11 is connected to the air suction port 14. The air inlet side 91a of the fan 91 is arranged toward the air suction port 14, so that the fan 91 can extract air near the air suction port 14 through the air suction port 14.

[0112] 7 , in one embodiment, the air inlet cavity upper shell 21 defines a cavity top wall of the air inlet cavity 11 , and the air inlet cavity rear shell 26 defines a rear side wall of the air inlet cavity 11 .

[0113] As can be seen in Figure 7, the air inlet cavity rear shell 26 is located below the air inlet cavity upper shell 21 and is further outwardly arranged relative to the air inlet cavity upper shell 21. In other words, along the front-to-back direction YY, the air inlet cavity rear shell 26 is further away from the volute tongue 40 than the air inlet cavity upper shell 21, which is conducive to increasing the air intake and thus indirectly increasing the air output.

[0114] In one embodiment, the fan 91 is a cross-flow fan 91, and the outlet side 91b of the impeller 911 (fan 91) is connected to the pressure diffuser 12. During the flow of gas through the impeller 911, the gas forms an airflow vortex (eccentric vortex) centered near the volute 40, and the airflow streamline at the outer edge of the airflow vortex is arranged in an arc shape. Therefore, the inner contour line of the air inlet chamber upper shell 21 is also arranged in an arc shape, and can be adaptively designed according to the airflow streamline of the fan 91, so that the gas can flow smoothly along the inner wall of the air inlet chamber upper shell 21 to the pressure diffuser 12, effectively reducing the pressure loss of the airflow in the air inlet chamber 11 and increasing the air volume entering the pressure diffuser 12. Compared with the solution of using a centrifugal fan 91 in the related art, this embodiment of the present application uses a cross-flow fan 91, and there is no need to consider the design and installation of the centrifugal shell structure outside the centrifugal fan 91, which reduces the assembly difficulty and improves production efficiency.

[0115] Please refer to Figure 7 again. The pressure diffusion chamber upper shell 22 is connected to the above-mentioned air inlet chamber upper shell 21 and the heat exchange chamber upper shell 23. The pressure diffusion chamber upper shell 22 is at least together with the shell body 311 and the side panels 70 to form the pressure diffusion chamber 12. The heat exchange chamber upper shell 23 is surrounded by the water receiving tray 60 and the side panels 70 to form the heat exchange chamber 13.

[0116] To enhance structural strength, a first reinforcing rib 24 (shown in FIG. 4 ) can be provided on the top surface of the diffuser chamber upper shell 22. The first reinforcing rib 24 can extend from the diffuser chamber upper shell 22 to the air inlet chamber upper shell 21. The extension length of the first reinforcing rib 24 is not specifically described herein. The housing can be provided with multiple first reinforcing ribs 24, spaced apart along the width of the indoor unit 1 to further enhance structural strength.

[0117] Furthermore, in one embodiment, referring to Figures 2 and 5 , the housing is further provided with two air guide plates 25 . These air guide plates 25 are respectively positioned on the inner sides of the side panels 70 and cover the sides of the air inlet chamber 11 and at least a portion of the diffuser chamber 12. The air guide plates 25 include connecting portions 251 and guiding portions 253 . The connecting portions 251 are located on either side of the air inlet chamber 11 along the left-right direction XX. They are used to mount the fan 91 and cover the portion of the motor 913 excluding the impeller 911, thereby stabilizing the airflow and directing as much gas as possible into the diffuser chamber 12. The guiding portions 253 are located on either side of the diffuser chamber 12. The guiding portions 253 have air guide surfaces on the sides facing the diffuser chamber 12, extending inward from the diffuser chamber 12 toward the heat exchange chamber 13. These air guide surfaces primarily guide the airflow within the diffuser chamber 12, improving airflow stability and directing the majority of the airflow toward the center of the heat exchanger 92, thereby enhancing heat exchange efficiency.

[0118] A volute tongue 40 is provided at one end of the second shell 30 close to the air inlet chamber 11. The volute tongue 40 is specifically arranged at the junction of the air inlet chamber 11 and the diffuser chamber 12. The volute tongue 40 is used to divide the airflow on the outlet side 91b of the fan 91. When the fan 91 is a cross-flow fan 91, the volute tongue 40 also plays a role in stabilizing the eccentric vortex, which can increase the cross-flow area, thereby increasing the flow rate and pressure head of the fan 91. The volute tongue 40 has a surface facing the diffuser chamber upper shell 22, and this surface and the diffuser chamber upper shell 22 define the inlet section of the diffuser chamber 12. The airflow entering this inlet section of the diffuser chamber 12 from the outlet side 91b of the fan 91 has a higher kinetic energy (dynamic pressure), and the potential energy (static pressure) of the airflow at the inlet section is relatively small.

[0119] Please refer back to Figure 7. Along the front-to-back direction YY, that is, along the direction from the pressure diffuser 12 to the heat exchange chamber 13, the gas transverse flow area of ​​the pressure diffuser 12 is increased. For example, the wall surface of the upper shell 22 of the pressure diffuser or the wall surface of the shell body 311 is arranged in a stepped manner, so that the gas transverse flow area of ​​the pressure diffuser 12 is increased in a stepped manner. When the airflow at the inlet section flows in the pressure diffuser 12, as the transverse flow area of ​​the gas gradually increases, the gas flow rate gradually decreases and the dynamic pressure decreases. The smaller gas flow rate allows the gas to fully exchange heat with the heat exchanger 92 when passing through the heat exchange chamber 13, thereby improving the heat exchange efficiency, and because the gas flow rate is slowed down, the noise during air supply is also reduced. In addition, according to Bernoulli's principle, as the dynamic pressure of the gas decreases, the static pressure of the gas increases, so the static pressure of the gas is relatively large when it flows out from the air outlet 15. The larger static pressure can help the airflow flowing out of the air outlet 15 to overcome the air resistance more effectively, so that the airflow can reach a farther distance relative to the air outlet 15, so that the indoor unit 1 has a considerable air supply distance.

[0120] Furthermore, the pressure diffuser 12 can be configured to gradually expand. In some embodiments, the housing body 311 is tilted upward away from the water tray 60, and the pressure diffuser upper housing 22 can be arranged horizontally, or the pressure diffuser upper housing 22 can be arranged in an arc that conforms to the airflow streamlines, similar to the air inlet chamber upper housing 21. In short, as the distance between the pressure diffuser upper housing 22 and the housing body 311 gradually increases toward the heat exchange chamber 13, the lateral flow area of ​​the gas within the pressure diffuser 12 gradually increases, resulting in smoother airflow changes, reducing or avoiding noise caused by airflow turbulence, further reducing the noise of the indoor unit 1, and improving the air supply quality and effect.

[0121] However, it is understood that during the process of airflow from the inlet section of the diffuser chamber 12 into the heat exchange chamber 13, the dynamic pressure is not completely converted into static pressure, and a small amount of pressure loss still occurs. This pressure loss is divided into along-the-line pressure loss and local pressure loss of the gas. Among them, along-the-line pressure loss refers to the pressure drop caused by factors such as friction, resistance, and flow changes during the flow of the fluid in the pipeline (air duct assembly 10), which is inevitable. When the fluid flows through the elbows, joints, etc. of the air duct assembly 10, the magnitude and direction of the flow velocity change, which will generate vortices and turbulence. The pressure loss caused by this is called local pressure loss.

[0122] In the related art, the shell mostly uses a partition to separate the fan and the heat exchanger. When the gas flows from the outlet side of the fan to the heat exchanger, it is partially blocked by the partition and vortexes are generated. Moreover, the fan mostly has a volute, and the outlet section of the volute mostly extends into the heat exchange chamber. There is a gap between the outlet section and the inner wall of the heat exchange chamber. The airflow flowing out of the air outlet of the volute is also more likely to generate vortices in the above gap. In the above situation, on the one hand, more local pressure losses are caused during the circulation of the gas. When the dynamic pressure at the inlet section of the diffuser chamber is constant, the static pressure of the gas at the air outlet is relatively small, which affects the air supply distance. On the other hand, the presence of vortices not only affects the operating state of the air flow, but also generates noise, which has a greater impact on the user experience. Obviously, the air supply distance and air supply quality of the duct air conditioner in the related art are affected, and the air supply effect is not ideal.

[0123] Therefore, referring to Figures 4 and 7 , in the embodiment of the present application, the pressure diffuser upper shell 22 is connected to the heat exchange chamber upper shell 23. The pressure diffuser upper shell 22 defines the top wall of the pressure diffuser chamber 12, while the heat exchange chamber upper shell 23 defines the top wall of the heat exchange chamber 13. The shell body 311 is connected to the water receiving tray 60. The shell body 311 defines at least a portion of the bottom wall of the pressure diffuser chamber 12, while the water receiving tray 60 defines the bottom wall of the heat exchange chamber 13. The pressure diffuser chamber 12 is located on one side of the heat exchange chamber 13 and does not extend into the heat exchange chamber 13. The end of the pressure diffuser upper shell 22 away from the air inlet chamber upper shell 21 is connected to the starting end of the heat exchange chamber upper shell 23 and does not extend into the heat exchange chamber 13. Similarly, the end of the shell body 311 away from the volute 40 is connected to the starting end of the water receiving tray 60 and does not extend into the heat exchange chamber 13. As a result, the top wall of the pressure diffusion chamber 12 and the top wall of the heat exchange chamber 13 are directly connected, and the bottom wall of the pressure diffusion chamber 12 and the bottom wall of the heat exchange chamber 13 are directly connected, without any overlapping area when projected along the up and down direction ZZ. There is no gap between the outlet section of the pressure diffusion chamber 12 and the wall of the heat exchange chamber 13, so that when the airflow flows out of the pressure diffusion chamber 12, no turbulent airflow will be formed in the gap between the wall of the pressure diffusion chamber 12 and the wall of the heat exchange chamber 13.

[0124] In this way, when the gas flows from the pressure diffuser 12 to the heat exchange chamber 13, since the pressure diffuser 12 and the heat exchange chamber 13 are directly connected and the pressure diffuser 12 does not extend into the heat exchange chamber 13, this arrangement can reduce or avoid disturbances such as vortices or turbulence generated near the connecting port 17 when the gas flows out of the pressure diffuser 12. It can also reduce or avoid the formation of turbulent airflow in the gap between the walls of the pressure diffuser 12 and the heat exchange chamber 13, thereby reducing pressure loss and noise. Through the above arrangement, the air duct assembly 10 of the embodiment of the present application can effectively reduce or avoid pressure loss caused by vortices or changes in cross-section during the air flow from the pressure diffuser 12 to the heat exchange chamber 13, thereby maximizing the conversion of the dynamic pressure of the airflow on the outlet side 91b of the fan 91 into static pressure, thereby effectively increasing the static pressure level at the air outlet 15 of the indoor unit 1 and improving the air supply distance. Due to the reduction of disturbances such as airflow vortices, the noise level of the indoor unit 1 during air supply will also be effectively reduced, and the air supply quality will be improved.

[0125] Furthermore, the transverse flow area of ​​the gas from the diffuser chamber 12 to the heat exchange chamber 13 remains unchanged or increases. It should be noted that, referring to FIG. 7 , the diffuser chamber 12 and the heat exchange chamber 13 are connected via the communication port 17. Along the front-to-back direction YY, at least in the region from before to after the communication port 17, for example, the region after the middle section of the diffuser chamber 12 and before the heat exchanger 92, the transverse flow area of ​​the gas remains unchanged or increases.

[0126] In some embodiments, the heat exchange chamber upper shell 23 and the pressure diffuser chamber upper shell 22 extend in the same direction, and the water tray 60 and the housing body 311 extend in the same direction. Alternatively, the heat exchange chamber upper shell 23 extends further upward relative to the pressure diffuser chamber upper shell 22, and the water tray 60 extends further downward relative to the housing body 311. This maintains or increases the transverse flow area of ​​the gas. Furthermore, since the gas flow area remains unchanged or increases as it flows from the pressure diffuser chamber 12 to the heat exchange chamber 13, pressure loss caused by a reduced gas flow area is avoided, further improving the static pressure level at the air outlet 15 of the indoor unit 1 and increasing the air supply distance.

[0127] As shown in FIG7 , in some embodiments, between the pressure diffuser 12 and the heat exchanger 92, the air duct assembly 10 does not form an obstruction in the flow direction of the airflow toward the heat exchanger 92. For example, the air duct assembly 10 does not have a windshield surface that is arranged at an angle to the flow direction of the gas. The windshield refers to a surface in the air duct that is arranged at an angle to the flow direction of the gas. It can be understood that this angle is greater than 0 degrees, such as 60 degrees, 90 degrees, and so on. Imagine that if there is a windshield surface in the flow direction of the gas, the gas hitting the windshield surface will cause energy loss, which is not conducive to the conversion of the dynamic pressure of the gas into static pressure. Therefore, in some embodiments of the present application, the inner wall of the pressure diffuser 12 is roughly trumpet-shaped; and in the part of the heat exchange chamber 13 near the pressure diffuser 12, the inner wall of the heat exchange chamber 13, such as the cavity top wall defined by the heat exchange chamber upper shell 23 and the cavity bottom wall defined by the water receiving tray 60, is arranged to expand outward relative to the connecting port 17. In this way, there is no pressure loss due to obstruction of the windshield surface during the process of gas flowing from the diffusion chamber 12 to the heat exchange chamber 13 and before passing through the heat exchanger 92, further improving the conversion rate of gas dynamic pressure to static pressure.

[0128] Please refer to Figure 4 or Figure 7. In a specific embodiment of the present application, on the upstream side of the heat exchange chamber 13, the diffuser chamber upper shell 22 is inclined upward in a direction away from the heat exchange chamber upper shell 23. The heat exchange chamber upper shell 23 includes a shell side wall 233 and a shell top wall 231. The shell side wall 233 is connected between the diffuser chamber upper shell 22 and the shell top wall 231, and the shell side wall 233 extends upward. In this embodiment, the shell side wall 233 extends vertically upward. In other embodiments, the shell side wall 233 can be: extending upward from the diffuser chamber upper shell 22 along the front-to-back direction to the shell top wall, so that the connection between the diffuser chamber 12 and the heat exchange chamber 13 is arranged in an outward-flaring shape relative to the connecting port 17, ensuring that there is no windshield above to block the airflow.

[0129] As shown in Figure 8, in order to make the connection between the diffuser chamber upper shell 22 and the heat exchange chamber upper shell 23 smoother, a portion of the diffuser chamber upper shell 22 close to one end of the heat exchange chamber upper shell 23 is horizontally arranged, and the shell side wall 233 of the heat exchange chamber upper shell 23 forms a 90-degree angle with this section of the diffuser chamber upper shell 22.

[0130] Furthermore, the water tray 60 defines the bottom wall of the heat exchange chamber 13 and is used to collect water generated by heat exchange at the heat exchanger 92. On the upstream side of the heat exchange chamber 13, the shell body 311 tilts upward away from the water tray 60 to form a gradually expanding diffuser chamber 12 structure in conjunction with the diffuser chamber upper shell 22. At the junction of the diffuser chamber 12 and the heat exchange chamber 13, the shell body 311 and the water tray 60 form a smooth transition to ensure a uniform flow field within the air duct, reducing or avoiding turbulence at the junction of the diffuser chamber 12 and the heat exchange chamber 13, thereby minimizing pressure loss and reducing noise.

[0131] Specifically, in one embodiment, referring to FIG7 , the water receiving tray 60 includes a tray bottom wall 60a and a tray side wall 60b. The tray side wall 60b is connected between the shell body 311 and the tray bottom wall 60a. An angle greater than or equal to 90 degrees is formed between the shell body 311 and the tray side wall 60b to further enable the airflow below to smoothly enter the heat exchange chamber 13.

[0132] Thus, in one embodiment, the shell side wall 233 of the upper shell 23 of the heat exchange chamber is extended upward, and the tray side wall 60b of the water receiving tray 60 is extended downward. The section of the heat exchange chamber 13 close to the pressure diffusion chamber 12 has a larger gas transverse flow area than the pressure diffusion chamber 12, further reducing the pressure loss of the gas when it flows from the pressure diffusion chamber 12 into the heat exchange chamber 13, and making the gas more uniform, thereby improving the heat exchange efficiency with the heat exchanger 92.

[0133] Referring to FIG. 7 , in some embodiments, the air outlet 15 is disposed on a side of the heat exchange chamber 13 away from the pressure diffusion chamber 12. Taking an arc-shaped heat exchanger as an example, the heat exchanger 92 is disposed in an arc shape that arches toward the air outlet 15. It is understandable that a plurality of refrigerant tubes 921 are provided through the heat exchanger 92. The plurality of refrigerant tubes 921 extend along the left-right direction XX and are arranged within the heat exchanger 92 along the up-down direction ZZ. In this embodiment, the central axis S of the pressure diffusion chamber 12 (i.e., the dotted line in the figure) passes through the middle (at the top of the arc) of the heat exchanger 92. Along the up-down direction ZZ, the heat exchanger 92 is thicker near the top of the arc than at its upper and lower ends. The number of refrigerant tubes 921 in the middle of the heat exchanger 92 is greater than the number of refrigerant tubes 921 at the upper and lower ends of the heat exchanger 92. It can be understood that the gas in the axial part of the diffuser chamber 12 is the mainstream area, and the gas flow in this area is large and the flow velocity is high. The embodiment of the present application allows this part of the gas to pass through the thickest area of ​​the heat exchanger 92, which can effectively improve the heat exchange efficiency of the heat exchanger 92.

[0134] As shown in Figures 9 to 12, in some embodiments, the water receiving tray 60 includes a connected water receiving portion 61 and a drain portion 62. The water receiving portion 61 is configured to support the heat exchanger 92 and is connected to the shell body 311. The water receiving portion 61 forms an upwardly open water receiving groove 611. The bottom wall of the water receiving groove 611 is provided with a lap boss 612. The lap boss 612 is configured to support the heat exchanger 92 and cooperates with the heat exchanger 92 to divide the heat exchange chamber 13 into a rear heat exchange chamber 131 and a front heat exchange chamber 132. The rear heat exchange chamber 131 is connected to the pressure diffuser chamber 12, and the front heat exchange chamber 132 is connected to the air outlet 15.

[0135] When the heat exchanger 92 is operating, some condensed water is generated on its surface. Under the action of gravity, the water generated on the surface of the heat exchanger 92 flows into the water receiving trough 611. Fixing the heat exchanger 92 to the overlapping boss 612 can prevent the heat exchanger 92 from being immersed in water, which may cause rust on the side panels of the heat exchanger 92, thereby extending the service life of the heat exchanger 92. The water receiving trough 611 is connected to the drain portion 62, and the bottom wall of the water receiving trough 611 is inclined downward toward the drain portion 62. This can further increase the flow rate of the condensed water in the water receiving trough 611 and prevent the condensed water from staying in the water receiving trough 611 for too long. The condensed water is discharged through the drain portion 62. The water receiving tray 60 of the embodiment of the present application can achieve a good water collection and diversion effect, preventing the accumulation of condensed water in the water receiving tray 60, which may breed bacteria and even cause corrosion to the water receiving tray 60.

[0136] 9 and 10 , in some embodiments, the drain portion 62 is provided with a water storage groove 621, a drain pipe 622, and a water pump mounting block 623. The drain pipe 622 is located within the water storage groove 621. After water from the water receiving trough 611 flows into the drain portion 62, the water in the drain portion 62 flows into the water storage groove 621, thereby improving the drainage efficiency of the drain pipe 622. The water pump mounting block 623 facilitates the installation and fixing of the water pump on the drain portion 62.

[0137] As shown in Figures 9 and 10, the second housing 30 also includes a pipe section 39, which connects the drain section 62 and one longitudinal end of the housing body 311. The pipe section 39 includes a first connecting plate 391, which connects the drain section 62 and the side of the housing body 311 and is arranged horizontally, and a second connecting plate 392, which is arranged vertically on the first connecting plate 391. The first connecting plate 391 has a through-hole 393. The second connecting plate 392 is located to one side of the through-hole 393 and at an end away from the water receiving pan 60. The second connecting plate 392 is connected to the side of the housing body 311. The through-hole 393 is used to pass the refrigerant pipe 921 of the heat exchanger 92, facilitating its connection to the outdoor unit. The through-hole 393 can be an elongated hole, which facilitates adjustment of the position of the refrigerant pipe 921 and facilitates the installation of refrigerant pipes 921 of different sizes. During installation, the end of the first connecting plate 391 near the air inlet cavity 11 forms a horizontal bearing portion, and the end of the second connecting plate 392 near the air inlet cavity 11 forms a support portion. The side panels 70 are relatively fixed to the horizontal bearing portion and the support portion, which not only facilitates the installation and fixation of the second shell 30 and the side panels 70, but also facilitates securement during installation. The pipe guide portion 39, the shell body 311, and the drainage portion 62 are integrally formed, effectively improving production and assembly efficiency, significantly reducing the number of parts, and lowering logistics costs.

[0138] Please refer to Figure 7 again. The lateral flow area size of the heat exchange front chamber 132 gradually decreases in the direction from the overlapping boss 612 to the air outlet 15 (from back to front). Specifically, along the direction close to the air outlet 15, the horizontal height of the bottom wall 60a of the water receiving tray 60 can be gradually increased, or the horizontal height of the top wall of the heat exchange chamber 13 can be gradually decreased, or both, so that the gas flow area gradually decreases. For example, in one embodiment, the bottom wall of the heat exchange front chamber 132 is set in an arc surface, and the bottom wall of the heat exchange front chamber 132 extends upward in the direction from the overlapping boss 612 to the air outlet 15. The arc surface structure has less resistance to airflow, better flow guidance effect, and can also reduce noise. Of course, in other embodiments, the bottom wall of the heat exchange front chamber 132 can also be set in an inclined surface. In this way, firstly, the conversion of part of the static pressure into dynamic pressure can be achieved, thereby improving the wind speed and air outlet efficiency at the air outlet 15; secondly, the increase in the horizontal height of the bottom wall of the heat exchange front chamber 132 can prevent the airflow from blowing moisture out of the heat exchange chamber 13, thereby avoiding water droplets falling into the room and affecting the user experience.

[0139] The air outlet 15 can be arranged opposite to the heat exchanger 92, so that the air flow can flow to the air outlet 15 in a shorter path after passing through the heat exchanger 92, so as to reduce the loss of the air flow during the flow. In some embodiments, the air outlet 15 can be formed by the first shell 20 (the upper shell 23 of the heat exchange chamber and the side panel 70) and the second shell 30 (the water receiving tray 60), and the direction of the air outlet 15 is horizontal. Generally, the gas flows from the diffusion chamber 12 to the heat exchange chamber 13 and passes through the heat exchanger 92 in a roughly horizontal direction. The horizontal air outlet can make the air flow be discharged more directly after the heat exchange with the heat exchanger 92, making the gas flow more stable, reducing unnecessary air flow disturbances and noise, and improving the working efficiency and comfort of the system. In other embodiments, in certain installation environments, the demand for side air outlet cannot be met, so the direction of the air outlet 15 can also be set upward or downward. For example, by using a variety of different installation accessories and interfaces, the direction of the air outlet 15 can be flexibly adjusted to meet the actual needs of different users or different scenarios, fully meet the user's personalized needs, and expand the application scope of the embodiment of the present application, thereby improving the applicability, stability and reliability of the entire system.

[0140] The first shell 20 and the second shell 30 can be formed by splicing multiple panels. However, if the panels are improperly installed, the sealing rings are aged or damaged, gaps may exist. When gas flows through the gaps, gas leakage will occur, which will cause a certain loss of energy in the airflow and may also generate noise or abnormal sounds, increasing subsequent maintenance costs. In addition, the installation process is complicated and production efficiency is low.

[0141] In some embodiments, the pressure diffuser upper shell 22 and the heat exchange chamber upper shell 23 are integrally formed, or the shell body 311 and the water receiving tray 60 are integrally molded. Alternatively, the pressure diffuser upper shell 22 and the heat exchange chamber upper shell 23 are integrally formed, and the shell body 311 and the water receiving tray 60 are integrally molded. For example, the second shell 30 can be integrally molded using plastic injection molding. The lightweight plastic material reduces product weight and facilitates transportation and installation. In the embodiments of the present application, the number of components of the first shell 20 and / or the second shell 30 is reduced, the manufacturing process is simple, and it is suitable for commercial production, which can effectively improve production and installation efficiency and reduce costs.

[0142] In addition, the embodiments of the present application greatly reduce the situation of splicing multiple shell panels, thereby reducing the situation of gaps at the joints. The inner walls of the diffusion chamber 12 and the heat exchange chamber 13 have higher integrity, the leakage amount during the air flow process is greatly reduced, the static pressure loss is also reduced, and the air flow is transmitted more smoothly, thereby increasing the air supply and heat exchange efficiency, and reducing the generation of noise.

[0143] In summary, the design that the diffuser chamber upper shell 22 and the heat exchange chamber upper shell 23 are integrally formed, and the shell body 311 and the water receiving tray 60 are integrally formed not only reduces the number of parts, but also reduces the complexity of the assembly process. This one-piece structure can improve the overall stability and durability. Secondly, the use of one-piece inner walls of the diffuser chamber 12 and the heat exchange chamber 13 can also provide a more uniform airflow distribution. Compared with the shell structure formed by splicing multiple panels, the one-piece design can eliminate the unevenness problem at the joints, ensure that the airflow in the air duct flows more smoothly, and reduce energy loss and pressure loss. In addition, since the cavity wall is manufactured by one-time molding and there are no splicing points, the possibility of airflow leakage can be effectively reduced. This optimized sealing can not only improve the working efficiency of the system, but also help prevent irrelevant gases or foreign objects from entering the air duct, protecting the safe and stable operation of the heat exchange chamber 13. In general, the embodiment of the present application is based on the design concept of one-piece molding, and is optimized by the connection structure between the pressure diffuser chamber 12 and the heat exchange chamber 13, which not only simplifies the manufacturing and assembly process, but also improves the stability, durability and overall work efficiency of the system.

[0144] Furthermore, please refer to Figures 4 and 6 again. In one embodiment, the pressure diffuser chamber upper shell 22, the heat exchange chamber upper shell 23 and the air inlet chamber upper shell 21 are integrally formed components. This embodiment of the present application not only further reduces the number of shell components and simplifies the manufacturing and assembly process, but also further reduces the joints of the shell, making the air flow smoother and reducing energy loss and pressure loss. More importantly, the air inlet chamber 11, the pressure diffuser chamber 12 and the heat exchange chamber 13 enclosed by the integrated cover 20a (including the pressure diffuser chamber upper shell 22, the heat exchange chamber upper shell 23, the air inlet chamber upper shell 21 and the air inlet chamber rear shell 26) and the second shell 30 are a continuous air duct, which can improve the pressure resistance of the air duct system. Specifically, when the fan 91 is a cross-flow fan 91, the fan 91 does not need to be provided with an additional volute. The first shell 20 and the second shell 30 can both serve as the outer shell and can also serve as the volute of the cross-flow fan 91 through adaptive design on the inner wall. In this way, the indoor unit 1 integrates the volute and the outer shell into one structure, thereby reducing the number of structures of the air duct assembly 10 and reducing the volume of the air duct assembly 10, which is conducive to miniaturization of the indoor unit 1 to adapt to more usage environments with more compact installation space.

[0145] Of course, in other embodiments, the indoor unit 1 may further include an outer shell, which may be configured to cover the outer surfaces of the first shell 20 and the second shell 30, leaving only the air outlet 15 and the air intake 14 exposed to communicate with the outside world, thereby protecting the shell.

[0146] Referring to Figure 13 , in some embodiments, the housing further includes an insulation layer 80, specifically an upper insulation layer 81 and a lower insulation layer 82. The upper insulation layer 81 is disposed on the surface of the heat exchange chamber upper shell 23 facing the interior of the heat exchange chamber 13, while the lower insulation layer 82 is disposed on the outer surface of the water receiving pan 60. To protect the lower insulation layer 82, the housing further includes a sheet metal member 83 attached to the exterior of the water receiving pan 60 by bolting or other means. The lower insulation layer 82 is sandwiched between the sheet metal member 83 and the water receiving pan 60. The insulation layer 80 may be an insulating sponge, foam, or insulating adhesive. The insulation layer 80 maintains the temperature within the air duct assembly 10 to a certain extent, reducing the probability of energy within the indoor unit 1 being dissipated outward through the first and second housings 20, 30. It also effectively isolates external noise and abnormal sounds and dampens the propagation of internal noise, thereby protecting internal components from external noise interference and improving the stability and reliability of the entire system.

[0147] Furthermore, as shown in FIG7 , the indoor unit 1 can be a ducted unit having an air duct inlet port 101 and an air duct outlet port 102. The air duct inlet port 101 is defined between the rear side of the heat exchange chamber 13 and the rear side of the air inlet chamber 11, and the air duct outlet port 102 is defined by the air outlet 15. This provides a location on the indoor unit 1 for connecting to the air inlet and outlet ducts, facilitating installation of the indoor unit 1 provided by the present application.

[0148] Optionally, the air duct inlet interface 101 and the air duct outlet interface 102 are both formed by enclosing the edges connected to the air duct assembly 10. In this way, the air duct inlet interface 101 can be connected to the pipe opening of the air inlet duct, and the air duct outlet structure can be connected to the pipe opening of the air outlet duct, so that the air inlet duct and the air outlet duct can be connected to the pipe opening of the air outlet duct, which facilitates the connection of the air inlet duct and the air outlet duct to the indoor unit 1.

[0149] In order to further improve the noise of the airflow, in some embodiments of the present application, the embodiments also specifically make relevant improvements to the volute tongue 40. The detailed structure of the volute tongue 40 is explained below in conjunction with Figures 14 to 20.

[0150] Please refer to Figures 14 to 16. In some embodiments, the second shell 30 includes a first split structure 31 and a second split structure 32, wherein the first split structure 31 includes a water receiving tray, a shell body 311, and a support portion 312 arranged at an end of the shell body 311 away from the water receiving tray, and the second split structure 32 is connected to the support portion 312 to cooperate with the support portion 312 and the shell body 311 to define the bottom wall of the diffusion chamber 12, and a portion of the second split structure 32 constitutes a volute tongue 40.

[0151] In some embodiments, the volute tongue 40 can guide the wind flow from the fan into the diffuser chamber 12 , that is, it is used to guide the wind flow from the air intake chamber 11 to the diffuser chamber 12 . The volute tongue 40 includes a volute tongue body 41 and guide ribs 42 .

[0152] The volute tongue body 41 is the main structure of the volute tongue 40 and can be made of plastic and manufactured by injection molding. Of course, the volute tongue body 41 can also be made of metal, and this application does not impose any restrictions on this. The volute tongue body 41 has a main surface 411. The main surface 411 of the volute tongue body 41 is configured to form a first windward section 412 and a first air-guiding section 413 that are adjacent to each other in sequence. Projected along the length direction of the air duct assembly 10, the contour line of the first windward section 412 is connected to the contour line of the air inlet cavity 11. The first air-guiding section 413 has a first arc-shaped contour line 414. The bottom wall of the diffuser cavity 12 is configured as a diffuser section 121. The contour line of the diffuser section 121 is arranged in a straight line and has a first straight contour line 1211. The first arc-shaped contour line 414 overlaps with the starting point of the first straight contour line 1211.

[0153] A plurality of guide ribs 42 are protruded on the main surface 411 of the volute tongue body 41 at intervals along the length direction of the air duct assembly 10. Each guide rib 42 is constructed into a second windward section 423 and a second wind guiding section 424. The second windward section 423 is arranged on the first windward section 412, and the second wind guiding section 424 is arranged on the first wind guiding section 413. When projected along the length direction of the air duct assembly 10, the end point of the contour line of the second wind guiding section 424 does not exceed the starting point of the first straight contour line 1211.

[0154] In summary, the snail tongue 40 of this embodiment has at least two effects:

[0155] First, since the wind flow from the fan is relatively fast during operation, noise is likely to occur. Based on this, the present application provides multiple guide ribs 42 protruding from the main surface 411 at intervals, so that when the wind flow from the fan passes through the volute tongue main body 41 and is guided by the main surface 411, part of the wind flow passes between two adjacent guide ribs 42. In this way, the wind flow with noise will be separated, so that the energy of the noise can be weakened, reducing the impact of noise on the user and reducing the generation of noise, thereby improving the user experience. In addition, the multiple guide ribs 42 are arranged at intervals along the length of the air duct assembly 10. In this way, under the guiding effect of the multiple guide ribs 42, the flow of wind in the length direction of the air duct assembly 10 can be reduced, that is, the flow of wind in the axial direction of the fan can be reduced, thereby reducing the energy loss of wind flow in the process of flowing to the air outlet 15.

[0156] Second, based on the form in which the end point of the contour line of the second air guide segment 424 of the guide rib 42 of the present embodiment does not exceed the starting point of the first straight contour line 1211, compared with the form in which the end point of the contour line of the second air guide segment 424 of the guide rib 42 overlaps with the starting point of the contour line of the diffuser segment 121, on the one hand, when the ends of the multiple guide ribs 42 of the present embodiment do not extend to the diffuser segment 121, the multiple guide ribs 42 will not occupy the space of the diffuser cavity 12, thereby avoiding the reduction of the space for airflow circulation in the diffuser cavity 12, and further avoiding the reduction of the airflow volume flowing through the diffuser cavity 12, thereby ensuring the air output volume; on the other hand, compared with the form in which the end point of the contour line of the second air guide segment 424 of the guide rib 42 overlaps with the starting point of the contour line of the diffuser segment 121, the extension length of each guide rib 42 can also be reduced, thereby reducing the material consumption of the guide rib 42 and reducing the production cost of the volute tongue 40.

[0157] Please refer to FIG. 16 . In some embodiments, the first straight contour line 1211 is tangent to the first curved contour line 414. It is understandable that when the wind flows through the main surface 411, part of it will flow to the diffuser section 121 under the guidance of the first air guide section 413. If the first straight contour line 1211 is not tangent to the curved contour line of the first air guide section 413, there will be a groove at the connection between the first straight contour line 1211 and the first curved contour line 414. Therefore, on the basis of the first straight contour line 1211 being tangent to the first curved contour line 414, it can be ensured that the part of the wind flow guided by the first air guide section 413 flows smoothly to the diffuser section 121, thereby further reducing the noise generated by the wind flow during the flow.

[0158] Please continue to refer to Figure 16. Further, the second air guide section 424 has a second arc contour line 425 and a second straight contour line 426. The first arc contour line 414 and the second arc contour line 425 are correspondingly arranged. The second straight contour line 426 extends from the end point of the second arc contour line 425 and ends at the end point of the first arc contour line 414.

[0159] In this way, the windflow will pass through the area of ​​the second arc contour line 425 of the second air guide section 424, and then pass through the area of ​​the second straight contour line 426 of the second air guide section 424. Based on the setting that the second straight contour line 426 ends at the end point of the first arc contour line 414, when the windflow flows out of the second air guide section 424, it will continue to flow through the area of ​​the first arc contour line 414 of the first air guide section 413, and finally flow to the diffuser section 121, thereby ensuring that the guide rib 42 does not occupy the space of the diffuser chamber 12, avoiding the reduction of the air volume of the airflow flowing through the diffuser chamber 12, ensuring the air output, and reducing the extension length of each guide rib 42, thereby reducing the material consumption of the guide rib 42 and reducing the production cost of the volute 40.

[0160] Please refer to Figure 16. In some embodiments, the first windward section 412 and the first wind guiding section 413 are both set with arc-shaped contour lines, and the normal vector direction of the arc vertex of the first windward section 412 is away from the air inlet cavity 11, and the normal vector direction of the arc vertex of the first wind guiding section 413 is toward the air inlet cavity 11.

[0161] In this way, when the fan is working, part of the wind flow it sends out will flow to the diffusion chamber 12 under the guidance of the first air guide section 413, and part will return to the air inlet chamber 11 under the guidance of the first windward section 412, so that this part of the wind flow can flow to the fan to stabilize the eccentric vortex of the fan, thereby improving the air supply performance of the fan. On the basis of the improved air supply performance of the fan, the fan can appropriately reduce its power when the required air supply volume is reached, thereby reducing the noise generated by the fan during operation.

[0162] Please continue to refer to Figure 16. Further, the second windward section 423 is set in an arc-shaped contour line, the second wind-guiding section 424 has a second arc-shaped contour line 425 and a second straight contour line 426, the first arc-shaped contour line 414 and the second arc-shaped contour line 425 are set correspondingly, the first arc-shaped contour line 414 corresponds to the second arc-shaped contour line 425, and the second straight contour line 426 starts from the end point of the second arc-shaped contour line 425 and ends at the end point of the first arc-shaped contour line 414.

[0163] In this way, the windflow will pass through the second arc contour line 425 area of ​​the second air guide section 424, and then pass through the second straight contour line 426 of the second air guide section 424. Based on the setting that the second straight contour line 426 of the second air guide section 424 ends at the end point of the second arc contour line 425, the windflow will continue to flow through the first arc contour line 414 area of ​​the first air guide section 413 when flowing out of the second air guide section 424, and finally flow to the diffuser section 121, thereby ensuring that the guide rib 42 does not occupy the space of the diffuser cavity 12, avoiding the reduction of the air volume of the airflow flowing through the diffuser cavity 12, ensuring the air output, and reducing the extension length of each guide rib 42, thereby reducing the material consumption of the guide rib 42 and reducing the production cost of the volute 40.

[0164] Referring to Figure 16 , in some embodiments, a concave cavity 45 is provided on the inner wall of the air inlet cavity 11. The concave cavity 45 is adjacent to and upstream of the first windward section 412. Thus, the concave cavity 45 can separate the inner wall of the air inlet cavity 11 from the first windward section 412, thereby reducing noise.

[0165] Please refer to Figures 16 to 18. In some embodiments, two adjacent guide ribs 42 and the main surface 411 jointly define a guide groove 43, wherein the cross-sectional shape of the guide groove 43 can be a trapezoid, a rectangle, a triangle, etc., which is not limited in this embodiment.

[0166] Projected along the length of the air duct assembly 10, the first windward section 412 of the bottom of the guide groove 43 and a portion of the first air-guiding section 413 form the groove bottom profile 431. The end point of the contour line of the second air-guiding section 424 intersects with the groove bottom profile 431, that is, the end of the groove bottom profile 431 does not exceed the starting point of the first straight contour line 1211. In this way, the airflow blown out by the fan, guided by the guide groove 43, will flow to the first air-guiding section 413 and then to the diffuser section 121, thereby ensuring that the guide ribs 42 do not occupy the space of the diffuser chamber 12, avoiding a reduction in the airflow flowing through the diffuser chamber 12, and ensuring the airflow. In addition, the extension length of each guide rib 42 is reduced, thereby reducing the material consumption of the guide rib 42 and lowering the production cost of the volute tongue 40.

[0167] Please continue to refer to Figures 16 to 18. Furthermore, the diffuser section 121 is connected to the first air guide section 413 and an intersection line 46 is formed at the connection point. The end point of the groove bottom profile 431 does not exceed the intersection line 46. In this way, the airflow blown out by the fan, guided by the guide groove 43, does not immediately flow to the diffuser section 121. Instead, it first flows to the first air guide section 413 and then to the diffuser section 121. This ensures that the guide ribs 42 do not occupy the space of the diffuser cavity 12, thus avoiding a reduction in the airflow volume flowing through the diffuser cavity 12 and ensuring the airflow volume. Furthermore, the extension length of each guide rib 42 is reduced, thereby reducing the material consumption of the guide ribs 42 and lowering the production cost of the volute tongue 40.

[0168] Please refer to Figures 18 and 19 in conjunction. In some embodiments, the contour of the guide rib 42 is configured to be wavy. When the contour of the guide rib 42 is configured to be wavy, it can be divided into three sections connected in sequence. The first section is an arc shape that is concave toward the tongue body 41, the second section is an arc shape that is raised in the direction away from the tongue body 41, and the third section is an arc shape that is concave toward the tongue body 41. It can be understood that the first section is closer to the diffuser 121 than the third section, and the curvature of the second section is greater than that of the first section. In this way, the first section will be smoother, so that when the airflow flows through the guide rib 42, it can reduce wind resistance and airflow loss, thereby enhancing air supply capacity.

[0169] In some embodiments, the contour of the guide rib 42 is configured as a broken line. When the contour of the guide rib 42 is configured as a broken line, it can be a two-section shape, where the first section is connected to the bottom of the tongue body 41, extends away from the tongue body 41, and is connected to the second section. The second section extends toward the tongue body 41 and intersects with the groove bottom contour 431.

[0170] In some embodiments, the contour of the guide rib 42 is configured as a single arc shape that rises in a direction away from the tongue body 41. When the contour of the guide rib 42 is configured as a single arc shape that rises in a direction away from the tongue body 41, the airflow encounters less obstruction when flowing through the guide rib 42, which can reduce wind resistance and airflow loss, thereby enhancing air supply capacity.

[0171] In some embodiments, the plurality of guide ribs 42 are all located on one side of the diffuser 121. It is understood that the plurality of guide ribs 42 can be located on the lower side of the diffuser 121 in both the vertical directions. In this way, the airflow is guided by the guide ribs 42 and flows upward toward the diffuser 121.

[0172] Of course, in other structural forms, the plurality of guide ribs 42 may also be located on the upper side of the diffuser section 121 in both the upper and lower directions, and this application does not impose any limitation on this.

[0173] Referring to Figures 19 and 20 , in some embodiments, the end of the second air-guiding section 424 extending toward the diffuser section 121 forms a smooth transition with the connection to the first air-guiding section 413. This allows the airflow to experience less resistance when passing through the connection between the end of the second air-guiding section 424 and the first air-guiding section 413, resulting in smoother flow and less noise.

[0174] Alternatively, the connection between the end of the second windward section 423 extending toward the air inlet cavity 11 and the first windward section 412 forms a smooth transition. In this way, the wind flow has less wind resistance when passing through the connection between the end of the second windward section 423 extending toward the air inlet cavity 11 and the second air guide section 424, and flows more smoothly, thus avoiding noise.

[0175] Alternatively, the connection between the end of the second air-guiding section 424 extending toward the diffuser section 121 and the first air-guiding section 413 forms a smooth transition, and the connection between the end of the second windward section 423 extending toward the air inlet cavity 11 and the first windward section 412 forms a smooth transition. In this way, the wind flow experiences less wind resistance when passing through the connection between the end of the second air-guiding section 424 and the first air-guiding section 413, flowing more smoothly and avoiding noise. Furthermore, the wind flow experiences less wind resistance when passing through the connection between the end of the second windward section 423 extending toward the air inlet cavity 11 and the second air-guiding section 424, flowing more smoothly and avoiding noise.

[0176] Furthermore, the shell body 311 and the support portion 312 can be an integral structure, which can improve the connection strength between the shell body 311 and the support portion 312, reduce the number of assembly steps for the shell body 311 and the support portion 312, and improve production efficiency. Of course, the two can also be separate structures and fixed by gluing, snap-fit ​​connection, etc., which is not limited in this application.

[0177] Please refer to Figure 19. In some embodiments, the second split structure 32 includes a first plate segment 321, a second plate segment 322 and a third plate segment 323. The first plate segment 321 constructs a volute tongue 40. The second plate segment 322 and the third plate segment 323 are connected to the opposite ends of the first plate segment 321. The second plate segment 322 cooperates with the shell body 311 of the first split structure 31 to construct the bottom wall of the diffusion chamber 12. The third plate segment 323 cooperates with the shell body 311 of the first split structure 31 to construct a portion of the inner wall of the air inlet chamber 11.

[0178] The support portion 312 is provided with a first connecting portion 3121 and a second connecting portion 3122, the first connecting portion 3121 is arranged above the support portion 312, and the second connecting portion 3122 is arranged below the support portion 312, wherein the second plate segment 322 is snap-connected to the first connecting portion 3121, and the third plate segment 323 is snap-connected to the second connecting portion 3122.

[0179] The first plate segment 321, the second plate segment 322, and the third plate segment 323 are connected end to end in sequence, and the three can be an integral structure, which makes the connection between each other more secure and reduces the assembly steps. Of course, they can also be split structures and fixed by threaded connection, snap connection or bonding, etc. This application does not impose any restrictions on this.

[0180] Specifically, the first connecting portion 3121 can be a first buckle, and a buckle hole for the first buckle to be snapped into is provided on the second plate segment 322, thereby realizing a buckle connection between the second plate segment 322 and the first connecting portion 3121; further, the first buckle can be trapezoidal in shape, that is, the side surface of the first buckle will be formed as a guide surface, so that when the first buckle is passed through the buckle hole, it can guide and cooperate with the side wall of the buckle hole to facilitate assembly.

[0181] The second connecting portion 3122 can be a second snap fastener, and a third snap fastener is provided on the third plate section 323. The second snap fasteners enclose a snap-fitting space, so that when the third snap fastener is overlapped with the second snap fastener, it can snap into the snap-fitting space. In this way, by providing at least two snap-fitting connections between the support portion 312 and the second split structure 32 in the vertical direction, the connection between the support portion 312 and the second split structure 32 is more stable, and assembly and disassembly are more convenient and quicker.

[0182] Referring to Figure 16 , the support portion 312 is further recessed in a direction away from the second split structure 32 to form a lap step. The first connecting portion 3121 is disposed on the lap step, and the second plate segment 322 can overlap the lap step and be snap-connected to the first connecting portion 3121. This allows the second plate segment 322 to be closer to the diffuser upper shell 22 than the lap step, preventing airflow from the fan from flowing onto the lap step. This prevents the support portion 312 from tilting toward the diffuser upper shell 22 under prolonged use. This could obstruct airflow from the tilted support portion 312 and result in energy loss. The lap step in this embodiment ensures that the intersection of the second plate segment 322 and the lap step faces away from the direction of airflow. This prevents the second plate segment 322 from tilting even under prolonged use, thus reducing the potential for energy loss.

[0183] Continuing with FIG. 16 , in some embodiments, the second split structure 32 and the support portion 312 enclose a hollow cavity 16. It is understood that the hollow cavity 16 can include a first half cavity and a second half cavity, with the first half cavity enclosed by the inner wall of the second split structure 32 and the second half cavity enclosed by the outer wall of the support portion 312, thereby enclosing and forming the hollow cavity 16. Alternatively, the hollow cavity 16 can be enclosed by the inner wall of the second split structure 32 alone, or by the outer wall of the support portion 312, which is not limited in this application. Thus, compared to a configuration in which the second split structure 32 and the support portion 312 are not hollow, this embodiment can reduce the material used for the volute body 41 and the support portion 312, thereby reducing the cost of the second housing 30 and the weight of the second housing 30, thereby reducing the overall weight of the indoor unit 1.

[0184] The above section explains the structural improvements made to the volute tongue 40 in the embodiment of this application. This arrangement effectively reduces airflow noise and enhances airflow stability. The volute tongue 40 divides the airflow and stabilizes the eccentric vortex near the volute tongue 40. The presence of eccentric vortices can affect the crossflow area and the operating efficiency of the fan 91 to a certain extent. Therefore, the embodiment of this application also incorporates the following improvements.

[0185] 21 and 22 , in order to improve the gas flow performance during use of the indoor unit 1, a first opening 37 is provided on the first surface 34 of the bottom surface of the second shell 30 constituting the pressure diffusion chamber 12, and a second opening 38 is provided on the second surface 35 of a portion of the wall surface of the air inlet chamber 11. At the same time, a return channel 36 is provided at the second shell 30, and the return channel 36 extends from the first opening 37 to the second opening 38.

[0186] In this way, the airflow driven by the fan 91 is diverted by the volute 40 to flow to the diffuser chamber 12 and the side of the volute 40 close to the air inlet side of the fan 91 respectively. After the diversion, the airflow pressure flowing into the diffuser chamber 12 becomes greater, so that the airflow pressure at the first opening 37 is greater than the airflow pressure at the second opening 38, and then through the pressure difference between the first opening 37 and the second opening 38, part of the airflow entering the diffuser chamber 12 is actively guided back to the air inlet side of the volute 40 close to the fan 91 through the return channel 36 to work again. It can not only compensate for the pressure on the side close to the fan 91 and the volute tongue 40, thereby reducing the vortex caused by the pressure difference, effectively improving the operating efficiency of the fan 91, so as to improve the air intake efficiency and pressure resistance of the air intake side of the fan 91, thereby improving the overall aerodynamic performance of the air duct assembly 10, and at the same time, after reducing the vortex, it can also simultaneously reduce the aerodynamic noise in the air duct assembly 10 to improve the user experience, and because the air flow pressure at the diffuser chamber 12 is greater than the air flow pressure of the volute tongue 40, compared with the solution of setting the first opening 37 at the volute tongue 40, the pressure difference between the first opening 37 and the second opening 38 of the present application will also be greater than the solution of setting the first opening 37 at the volute tongue 40, thereby further improving the efficiency of the air flow through the return channel 36 to improve the effect of air replenishment and pressurization.

[0187] In some structural forms, the return channel 36 is arranged in a curved shape. Specifically, the return channel 36 can be arranged in a curved shape, such as an arc or a wavy line, to slow down the impact velocity of the airflow within the return channel 36, further reducing airflow noise and stabilizing airflow. It should be noted that in other embodiments, the return channel 36 can also be arranged in a straight line, thereby increasing air volume at the same fan 91 speed. Alternatively, the return channel 36 can be a combination of a straight line and a curved line, and the specific selection can be made by those skilled in the art according to their needs.

[0188] Optionally, the width of the return channel 36 remains constant from the first opening 37 to the second opening 38. This maintains a stable airflow through the return channel 36, thereby maintaining a stable flow rate through the return channel 36 and enhancing the air supply and pressure boosting effect on the side of the fan 91 near the volute 40. Alternatively, in another embodiment, the return channel 36 is configured to gradually expand from the first opening 37 to the second opening 38. Specifically, the return channel 36 has two opposing surfaces whose vertical distance is equal to the width of the return channel 36, and the width of the return channel 36 gradually increases from the first opening 37 to the second opening 38. With this configuration, the width of the return channel 36 initially varies minimally at the first opening 37, ensuring uniform mixing of the airflow as it enters the return channel 36. Thereafter, the width of the return channel 36 continuously increases. While preventing flow separation within the return channel 36, the width variation is maximized for the same channel length. This ensures that airflow flow is maintained while reducing air velocity, thereby achieving noise reduction.

[0189] Referring to Figure 23, in some embodiments, the return flow channel 36 passes through the rotor of fan 91 along the extended line L0 of the return flow outlet and forms an angle θ with the outer tangent line L1 of the rotor of fan 91, where θ is less than or equal to 15 degrees and greater than or equal to 0 degrees. This ensures that the airflow stabilizes the eccentric vortex of the rotor of fan 91 while preventing excessive impact of the airflow on the rotor of fan 91, which could cause noise. When θ is greater than 15 degrees, the airflow may impact the rotor of fan 91 too strongly, causing vibration and noise. When θ is less than 0 degrees, the airflow's supplementary effect on the rotor of fan 91, i.e., the airflow's effectiveness in stabilizing the eccentric vortex of the rotor of fan 91, is less effective. For example, θ can be 0 degrees, 2 degrees, 5 degrees, 7 degrees, 10 degrees, 12 degrees, or 15 degrees, etc., and this is not limited in the present embodiment.

[0190] Furthermore, θ is equal to 0 degrees. Thus, the extended line L0 of the second opening 38 of the return channel 36 coincides with the peripheral tangent line L1 of the fan 91, so that the airflow flowing out through the second opening 38 can stabilize the eccentric vortex of the fan 91 while preventing the airflow from impacting the fan 91 and generating noise.

[0191] In some embodiments, with reference to FIG23 , the return flow channel 36 extends from the outer side of the rotor of the fan 91 along the extension line L0 of the second opening 38 and forms an angle β with the outer tangent line L1 of the rotor of the fan 91, with β being less than or equal to 45 degrees and greater than or equal to 0 degrees. This ensures that the airflow stabilizes the eccentric vortex of the rotor of the fan 91 while preventing excessive impact of the airflow on the rotor of the fan 91 and noise. When β is less than 0 degrees, the airflow can impact the rotor of the fan 91 too strongly, causing vibration and noise. When θ is greater than 45 degrees, the airflow's supplementary effect on the rotor of the fan 91 is reduced, meaning that the airflow's effectiveness in stabilizing the eccentric vortex of the rotor of the fan 91 is less effective. For example, β can be 0 degrees, 10 degrees, 20 degrees, 30 degrees, 40 degrees, 45 degrees, etc., and this is not a limitation in the present embodiment.

[0192] Furthermore, β is equal to 0 degrees. Thus, the extended line L0 of the second opening 38 of the return channel 36 coincides with the outer peripheral tangent line L1 of the rotor of the fan 91, so that the airflow flowing out through the second opening 38 can stabilize the eccentric vortex of the rotor of the fan 91 while preventing the airflow from impacting the fan 91 and preventing noise.

[0193] In some structural forms, the second shell 30 further includes a connecting surface (not shown) connected between the first surface 34 and the second surface 35. The connecting surface is concave to form an airflow groove. One end of the airflow groove passes through the first surface 34 to connect to the first opening 37, and the other end of the airflow groove passes through the second surface 35 to connect to the second opening 38. The volute tongue 40 covers the connecting surface so that the airflow groove forms a return channel 36. By providing the airflow groove on the connecting surface to form the return channel 36, the process difficulty is low and the processing is convenient. At the same time, when maintenance personnel need to clean and maintain the return channel 36 later, after removing the volute tongue 40 to expose the connecting surface, they can directly clean and maintain the airflow groove forming the return channel 36, thereby facilitating regular cleaning of the return channel 36 and ensuring the smooth flow of the return channel 36.

[0194] Referring to Figures 22 and 23 , in some structural forms, the second shell 30 further includes a shell body 311, a support portion 312, and a flow guide 50. The shell body 311 is provided with a first surface 34, which forms the bottom surface of the pressure diffuser 12 and is used to guide airflow to the heat exchange chamber 13. The shell body 311 is connected to the volute tongue 40, and the support portion 312 is connected to the side of the shell body 311 facing away from the first surface 34 and is also connected to the volute tongue 40. In this way, the shell body 311 and the support portion 312 are simultaneously connected to the volute tongue 40, thereby improving the positional stability of the volute tongue 40 after connection. The flow guide 50 is connected to the side of the shell body 311 facing away from the first surface 34, and the flow guide 50 cooperates with the support portion 312 to form a second opening 38.

[0195] The side of the support portion 312 facing away from the volute tongue 40 is configured as a first return air surface. The side of the air guide 50 facing the support portion 312 is configured as a second return air surface 521. The second return air surface 521 and the first return air surface cooperate to form the return flow channel 36. The support portion 312 and the air guide 50 cooperate to form the return flow channel 36, i.e., a split structural design is used to form the return flow channel 36 and the second opening 38. This facilitates disassembly and control to change the shape of the return flow channel 36, and also makes it easier to control the direction of the second opening 38.

[0196] 24 to 26 , to further reduce deformation of the air guide 50 and the support portion 312 when air flows through the return channel 36, at least one air guide rib 55 is provided on one of the first and second air return surfaces 521, and the other of the first and second air return surfaces 521 abuts against the at least one air guide rib 55. The air guide rib 55 can thus provide support for the air guide 50 and the support portion 312, further reducing deformation of the air guide 50 and the support portion 312.

[0197] Furthermore, the guide rib 55 is protruding from the first return air surface and is integrally formed with the first return air surface, and the second return air surface 521 abuts the guide rib 55. Alternatively, in another embodiment, the guide rib 55 is protruding from the second return air surface 521 and is integrally formed with the second return air surface 521, and the first return air surface abuts the guide rib 55. In this way, the guide rib 55 is integrally provided with one of the first return air surface and the second return air surface 521 and abuts the other, which increases the attachment area of ​​the guide rib 55, enhances structural stability, strengthens the interaction force between the guide rib 55, the guide member 50, and the support portion 312, and is less likely to deform.

[0198] Optionally, one of the first return air surface and the second return air surface 521 is provided with a plurality of guide ribs 55. The plurality of guide ribs 55 are arranged side by side and spaced apart in the transverse direction of the return flow channel 36. The plurality of guide ribs 55 divide the first opening 37 into a plurality of sub-inlets. The transverse direction of the return flow channel 36 is perpendicular to the direction of airflow within the return flow channel 36 and perpendicular to the direction from the first return air surface to the second return air surface 521. Referring to the figure, the direction indicated by arrow T is the transverse direction of the return flow channel 36. In this way, a plurality of guide ribs 55 are provided to further improve the structural stability of the guide member 50 and the support portion 312. At the same time, the first opening 37 is divided into a plurality of sub-inlets by the plurality of guide ribs 55, and the return channel 36 is divided into a plurality of sub-air ducts. The airflow separated from the diffuser chamber 12 is divided into multiple airflows leading out of the diffuser chamber 12, and the pressure of the airflow entering the return channel 36 is divided. The airflow pressure of the airflow entering a single sub-air duct is relatively small, and the force of the airflow in each sub-air duct on the guide member 50 and the support portion 312 is also relatively small, thereby reducing the impact on the guide member 50 and the support portion 312, thereby further reducing the deformation of the guide member 50 and the support portion 312 caused by the airflow entering the return air duct.

[0199] With reference to Figures 22, 27, and 28, the air duct assembly 10 further includes a plurality of clamping blocks, each of which is protruding from the guide rib 55 located on the first return air surface and is integrally formed with the guide rib 55. The second return air surface 521 is provided with a plurality of clamping openings 522, and each clamping block is inserted into one of the clamping openings 522. During assembly, by inserting a clamping block into the corresponding clamping opening 522, the air guide 50 and the support portion 312 can be quickly aligned. This facilitates assembly, effectively improves the alignment stability of the air guide 50 and the support portion 312, and effectively prevents deformation of the air guide 50 and the support portion 312 when the wind pressure is excessive.

[0200] Optionally, the guide ribs 55 extend longitudinally along the return channel 36 and from the first opening 37 toward the side where the second opening 38 is located. The longitudinal direction of the return channel 36 is the direction of airflow within the return channel 36. Multiple guide ribs 55 are provided on one of the first and second return air surfaces 521. The multiple guide ribs 55 are arranged side by side and spaced apart along the transverse direction of the return channel 36. The transverse direction of the return channel 36 is perpendicular to the direction of airflow within the return channel 36 and perpendicular to the direction from the first return air surface toward the second return air surface 521. Thus, the guide ribs 55 extend longitudinally through the return channel 36, thereby stabilizing the airflow out of the return channel 36 and reducing the wind resistance on the air inlet side of the fan 91.

[0201] Furthermore, in the transverse direction of the return channel 36 , the intervals between two adjacent guide ribs 55 are equal, which facilitates processing and ensures that the overall force balance is achieved when the support portion 312 and the guide member 50 are installed.

[0202] Of course, the spacing between two adjacent guide ribs 55 can also be unequal. It is understandable that, in the transverse direction of the return channel 36, the airflow pressure in different areas of the return channel 36 may vary. In areas with stronger airflow pressure, the airflow exerts a stronger force on the support portion 312 and the guide member 50, making the support portion 312 and the guide member 50 more susceptible to deformation. Based on this, in the transverse direction of the return channel 36, the return channel 36 includes multiple return air zones arranged side by side, with the airflow pressure in adjacent return air zones differing. The spacing between adjacent guide ribs 55 in a return air zone with higher airflow pressure is a, while the spacing between adjacent guide ribs 55 in a return air zone with lower airflow pressure is a, where a>a. Thus, in the transverse direction of the return channel 36, when the airflow pressure in the middle area is higher and the airflow pressure in the edge area is lower, the spacing between adjacent guide ribs 55 gradually decreases from the edge area toward the middle area, resulting in a distribution of multiple guide ribs 55 that is denser in the middle and more sparse at the edges.

[0203] Referring to Figure 27 , optionally, at least one guide rib 55 provided on one of the first and second return air surfaces 521 includes two third surfaces 551 disposed opposite each other. The two third surfaces 551 are disposed perpendicularly or at an obtuse angle toward a portion of the first and second return air surfaces 521 on the same side. This allows the guide rib 55 to have a larger connection area with the corresponding guide member 50 and support portion 312, thereby improving the installation stability of the guide rib 55.

[0204] Furthermore, the guide rib 55 has a fourth surface 552 connected between the two third surfaces 551. The fourth surface 552 abuts the other of the first and second return air surfaces 521. This improves the support stability of the guide rib 55 on the support portion 312 and the guide member 50. For example, when both third surfaces 551 of the guide rib 55 are in contact with the first return air surface, the fourth surface 552 abuts the second return air surface 521; when both third surfaces 551 of the guide rib 55 are in contact with the second return air surface 521, the fourth surface 552 abuts the first return air surface.

[0205] Optionally, the vertical spacing between the two third surfaces 551 gradually decreases or remains constant in the direction from the first opening 37 of the return channel 36 toward the second opening 38. Considering that the airflow pressure at the first opening 37 is higher and the airflow pressure at the second opening 38 is lower, the vertical spacing between the two third surfaces 551 in the transverse direction of the return channel 36 gradually decreases in the direction from the first opening 37 of the return channel 36 toward the return outlet, thereby gradually increasing the flow area of ​​the sub-duct.

[0206] Referring to Figures 22 and 28, in some structural forms, the air guide 50 includes a connecting portion 51, an air guide portion 52, and a cavity wall portion 53. The connecting portion 51 is stacked on the side of the shell body 311 facing away from the first surface 34 and is detachably mounted on the shell body 311. The connecting portion 51 can be arranged in a flat plate and stacked and fitted with the shell body 311 to increase the contact area between the two and thereby improve the stability of the connection. The air guide portion 52 is connected to the connecting portion 51 at an angle and has a second return air surface 521. The air guide portion 52 is used to cooperate with the support portion 312 to form the return flow channel 36 and the second opening 38. The air guide portion 52 can be arranged in an arc-shaped plate to facilitate guiding the direction of the airflow. The cavity wall portion 53 is connected at an angle to the end of the air guide portion 52 that faces away from the connecting portion 51 and extends in a direction away from the shell body 311. Thus, the cavity wall portion 53 cooperates to form a portion of the cavity wall of the air inlet cavity 11 (the air inlet cavity front shell 33), thereby also guiding the airflow toward the fan 91. The connecting portion 51, the air guide portion 52, and the cavity wall portion 53 can be an integral structure to improve the stability of the overall structure of the air guide 50. Of course, the above three can also be provided as separate components to facilitate the maintenance and replacement of individual components at a later time.

[0207] Furthermore, the connecting portion 51 has a first connecting hole, and the shell body 311 has a second connecting hole corresponding to the first connecting hole. The air duct assembly 10 also includes a fastener that passes through the second connecting hole and the first connecting hole in sequence to fix the connecting portion 51 to the shell body 311. The first connecting hole and the second connecting hole can be threaded holes, and the fastener can be a screw. The screw is used to fix the connecting portion 51 to the shell body 311. This fixing method is relatively simple to install and easy to disassemble, facilitating subsequent maintenance.

[0208] The cross-flow fan 91 has advantages such as uniform air supply, simple structure, and convenient installation, but it also has disadvantages such as poor pressure resistance and high noise. In some air duct systems with poor pressure resistance, the above-mentioned disadvantages of the cross-flow fan 91 are particularly severe. For this reason, the indoor unit 1 in the related art often adopts a centrifugal fan 91 during design to ensure the air supply distance. However, the centrifugal fan 91 has a relatively complex structure and is difficult to assemble, with high maintenance costs. In addition, the fan 91 also has the problem of high noise when running at high speed. In conjunction with Figure 7, in some embodiments of the present application, thanks to the optimized air duct design at the connection between the diffuser chamber 12 and the heat exchange chamber 13, the noise reduction and flow guidance design of the volute 40, and the related design of the return channel 36, the pressure resistance and gas flow performance of the air duct system are greatly enhanced, and the noise can also be reduced. This can undoubtedly make up for the relevant defects of the indoor unit 1 and provide structural conditions for the indoor unit 1 to adopt the cross-flow fan 91. When the crossflow fan 91 is applied to the indoor unit 1, it not only ensures sufficient air supply distance and minimal noise impact, but also has advantages such as uniform air supply, a simple structure, and easy disassembly and maintenance. Furthermore, when using the crossflow fan 91, the air inlet chamber upper shell 21 can be directly connected to the pressure diffuser chamber upper shell 22, the heat exchange chamber upper shell 23, and the air inlet chamber rear shell 26, and serve as part of the indoor unit 1 housing. In this way, the air inlet chamber 11, the pressure diffuser chamber 12, and the heat exchange chamber 13 form a coherent air duct, and the crossflow area within the air duct assembly 10 is more sufficient, which can further improve the pressure resistance of the air duct system and make the operation of the crossflow fan 91 more ideal. In addition, the highly integrated shell structure also helps to reduce the volume of the indoor unit 1 and improve space utilization. It can be seen that in these embodiments, the structural designs of the crossflow fan 91 and the air duct assembly 10 complement each other, and the synergistic effect of the two can produce more prominent effects.

[0209] In order to solve the problems of high maintenance complexity and poor heat dissipation of the electric control box 93 in the related art, referring to Figures 29 to 31, in some embodiments, the electric control box 93 is disposed outside the air duct assembly 10, and part of the air intake 14 is located between the electric control box 93 and the fan 91. In this way, when the electric control box 93 is exposed outside the air duct assembly, the grille at the inspection port is removed to reveal the electric control box 93, making it easier to inspect or disassemble the electric control box 93 for maintenance. In addition, when the fan 91 is running, it draws external air into the electric control box 93. After passing through the electric control box 93, the air flows into the air inlet cavity 11 through the air intake 14. When the external air flows through the electric control box 93, it can carry the heat generated by the electric control box 93 and flow into the air inlet cavity 11 through the air intake 14, thereby achieving heat dissipation of the electric control box 93 and improving the performance of the electric control box 93.

[0210] It should be noted that, in some embodiments, since an external air intake port is usually provided on the ceiling below the second shell 30, in order to shorten the flow path of the external air flow to the electric control box 93 and achieve efficient heat dissipation of the electric control box 93, the electric control box 93 can be provided below the second shell 30. In this way, the air flow entering through the external air intake port can flow directly to the electric control box 93.

[0211] The external air inlet is formed as an inspection port of the indoor unit 1. It is understandable that a grille can be provided at the inspection port, and when the electric control box 93 is inspected or disassembled for maintenance, the grille at the inspection port needs to be removed, and the electric control box 93 can be inspected or disassembled for maintenance.

[0212] Furthermore, during operation of the indoor unit 1, external air needs to flow into the air inlet chamber 11. Therefore, the air intake 14 includes a first return air port 141 and a second return air port 143 that are connected. The first return air port 141 is arranged to face the external air intake port, and the second return air port 143 is located between the fan 91 and the electrical control box 93. In this way, during operation of the motor, not only can the external air be drawn into the air inlet chamber 11 through the first return air port 141, but the airflow after dissipating heat to the electrical control box 93 can also be drawn into the air inlet chamber 11 through the second return air port 143. This effectively dissipates heat from the electrical control box 93 while allowing the indoor unit 1 to operate normally.

[0213] In this embodiment, to shorten the airflow path and reduce the number of piping, the first return air inlet 141 is oriented downwardly toward the indoor unit 1. When the first return air inlet 141 is oriented downwardly toward the indoor unit 1, the second return air inlet 143 can be located in front of the air intake 14 or behind the first return air inlet 141. The positional relationship between the first return air inlet 141 and the second return air inlet 143 is not specifically limited.

[0214] When the indoor unit 1 provided in this embodiment is installed in an indoor space, its height direction, length direction and width direction are naturally formed, wherein the height direction of the indoor unit 1 is consistent with the up-down direction ZZ in the figure, the length direction of the indoor unit 1 is consistent with the left-right direction XX in the figure, and the width direction of the indoor unit 1 is consistent with the front-back direction YY in the figure.

[0215] In this embodiment, the first return air outlet 141 extends at least along the length direction and the width direction, and the second return air outlet 143 extends at least along the length direction and the height direction; it can be understood that the first return air outlet 141 extends along the horizontal plane direction, and the second return air outlet 143 extends along the vertical plane direction.

[0216] When the external air intake is located below the indoor unit 1, at least a portion of the first air return port 141 is arranged to overlap with the external air intake in the height direction. This arrangement allows external air to quickly flow through the external air intake and the first air return port 141 into the air inlet chamber 11 during operation of the indoor unit 1, improving air flow efficiency and thereby enhancing the performance of the indoor unit 1 provided by this embodiment.

[0217] The following will be further described by taking the example of the electric control box 93 being installed below the second housing 30 .

[0218] Continuing with Figures 32 and 33, the electrical control box 93 generally includes a box body 931, a box cover 932, and an electrical control board assembly 933. The box body 931 is connected to the second housing 30, and the box cover 932 is located on the side of the box body 931 facing the external air intake. The box cover 932 and the box body 931 define a receiving chamber 93a, and the electrical control board assembly 933 is located within the receiving chamber 93a. Therefore, the electrical control board assembly 933 is the primary source of heat within the electrical control box 93. To dissipate the heat generated by the electrical control board assembly 933, it is necessary to allow external airflow to flow into the receiving chamber 93a and then out through the receiving chamber 93a into the air inlet chamber 11. Thus, a heat dissipation channel can be formed in the electronic control box 93, and the air inlet end of the heat dissipation channel is connected to the outside world, and the air outlet end of the heat dissipation channel is connected to the air inlet cavity 11 through the air suction port 14, that is, the air outlet end of the heat dissipation channel is closer to the air suction port 14 than the air inlet end of the heat dissipation channel. In this way, the fan 91 can draw the external airflow into the accommodating cavity 93a, and carry the heat released by the electronic control board assembly 933 into the air inlet cavity 11.

[0219] Since the electric control panel assembly 933 needs to be electrically connected to other modules inside the indoor unit 1, a wire hole 9317 can be opened on the side wall of the box body 931 to allow the wiring harness of the electric control panel assembly 933 to pass through and be electrically connected to other modules.

[0220] Continuing to refer to Figures 34 and 35, in order to form the aforementioned heat dissipation channel, at least one first heat dissipation hole 9321 can be provided on the box cover 932, extending through the box cover 932. The first heat dissipation hole 9321 forms the air inlet end of the heat dissipation channel, thereby connecting the accommodating chamber 93a with the outside world. Furthermore, at least one second heat dissipation hole 9318 can be provided on the box body 931. The second heat dissipation hole 9318 forms the air outlet end of the heat dissipation channel. Thus, when the fan 91 is operating, external air can flow into the accommodating chamber 93a through the first heat dissipation hole 9321, then flow out of the accommodating chamber 93a through the second heat dissipation hole 9318, carrying heat dissipated by the electronic control board assembly 933. Thereafter, the air can flow into the air inlet chamber 11 through the second return air port 143, thereby dissipating heat from the electronic control box 93.

[0221] Furthermore, at least a portion of the at least one second heat dissipation hole 9318 is disposed toward the air intake port 14, that is, at least a portion of the at least one second heat dissipation hole 9318 is disposed toward the second air return port 143. This arrangement allows the heat dissipation airflow from the second heat dissipation hole 9318 to quickly flow to the second air return port 143 and then flow into the air inlet cavity 11 through the second air return port 143.

[0222] At the air inlet end of the heat dissipation channel, that is, at the position of the first heat dissipation hole 9321, in order to enable the air flow to quickly pass through the first heat dissipation hole 9321 and flow into the accommodating cavity 93a, an electric control box guide portion 9323 can be formed on the box cover 932, and the electric control box guide portion 9323 is arranged close to the second return air outlet 143, and the first heat dissipation hole 9321 is opened on the electric control box guide portion 9323; and an electric control box guide surface 9325 is formed on the side of the electric control box guide portion 9323 facing away from the bottom of the accommodating cavity 93a, and the electric control box guide surface 9325 extends obliquely toward the air intake port 14. Specifically, the electric control box guide surface 9325 extends obliquely toward the second return air outlet 143. In this way, when the air flow flows into the first heat dissipation hole 9321, under the guidance of the guide surface 9325 of the electric control box, the air flow can flow along the preset direction, so as to reduce the resistance encountered by the air flow during the flow process to a certain extent, so that the air flow can flow through the first heat dissipation hole 9321 to the accommodating cavity 93a more quickly, thereby improving the heat dissipation efficiency of the electric control box 93.

[0223] In order to speed up the flow of airflow, in some optional embodiments, there can be multiple first heat dissipation holes 9321 and multiple second heat dissipation holes 9318, multiple first heat dissipation holes 9321 form a first heat dissipation area, and multiple second heat dissipation holes 9318 form a second heat dissipation area; and multiple first heat dissipation holes 9321 and multiple second heat dissipation holes 9318 are arranged in rows and columns, wherein, arrangement in rows and columns can be understood as multiple first heat dissipation holes 9321 are multiple rows in the thickness direction of the electric control box 93, and multiple first heat dissipation holes 9321 are multiple columns in the length direction of the electric control box 93, and the arrangement method of multiple second heat dissipation holes 9318 can be the same as the arrangement method of multiple first heat dissipation holes 9321, that is, multiple second heat dissipation holes 9318 are multiple rows in the thickness direction of the electric control box 93, and multiple second heat dissipation holes 9318 are multiple columns in the length direction of the electric control box 93.

[0224] Through the above arrangement, not only can the air flow quickly flow into the accommodating cavity 93a through the first heat dissipation hole 9321, and can also quickly flow out of the accommodating cavity 93a through the second heat dissipation hole 9318, but more air flow can also flow into the accommodating cavity 93a through the first heat dissipation hole 9321, so that more heat generated by the electric control board assembly 933 can be carried out of the accommodating cavity 93a, thereby achieving a better heat dissipation effect on the electric control box 93.

[0225] It should be noted that the length direction of the above-mentioned electric control box 93 is consistent with the length direction of the indoor unit 1, that is, the XX axis direction in FIG. 1 .

[0226] It is understood that during the operation of the fan 91, along the height direction of the indoor unit 1, i.e., the vertical direction ZZ in Figure 1, the air volume is greatest in the middle of the air intake port 14, i.e., the air volume is greater in the middle of the second return air port 143. Furthermore, to increase the air flow rate through the first heat dissipation holes 9321 into the accommodating chamber 93a, the first heat dissipation area is located in the middle of the air intake port 14, i.e., the first heat dissipation area is located in the middle of the second return air port 143, along the height direction of the indoor unit 1. This further increases the air flow rate through the first heat dissipation holes 9321 into the accommodating chamber 93a, allowing the greater amount of heat generated by the electronic control board assembly 933 to be extracted.

[0227] As for the second heat dissipation area, if the second heat dissipation area is located outside the height range of the air intake port 14, when the airflow flows out through the second heat dissipation holes 9318 and flows into the air inlet chamber 11 through the second return air port 143, the direction of the airflow will change, which will increase the resistance of the gas during the flow and reduce the heat dissipation efficiency of the electronic control box 93. Therefore, in some embodiments, in the height direction of the indoor unit 1, the second heat dissipation area is located within the height range of the air intake port 14, that is, the second heat dissipation area is located within the height range of the second return air port 143. In this way, after passing through the second heat dissipation holes 9318, the airflow can directly flow into the second return air port 143 and then into the air inlet chamber 11, so that the airflow encounters less resistance during the flow, thereby allowing the airflow to flow quickly and improving the heat dissipation efficiency of the electronic control box 93.

[0228] Referring to Figure 33 , since both the first and second heat dissipation areas have a certain coverage area along the length of the electrical control box 93, to facilitate the placement of the first and second heat dissipation holes 9321, 9318, the coverage length of the first and second heat dissipation areas falls within the same length segment along the length of the electrical control box 93. This not only ensures that the airflow through the plurality of first heat dissipation holes 9321 and the plurality of second heat dissipation holes 9318 is equal, allowing the cooling airflow to flow out quickly and improving the heat dissipation efficiency of the electrical control box 93, but also facilitates the placement of the first and second heat dissipation holes 9321, 9318, reducing the number of processing steps required for the electrical control box 93 and improving the appearance of the electrical control box 93.

[0229] It should be noted that the first heat dissipation holes 9321 and the second heat dissipation holes 9318 can be round holes or square holes, etc. Here, there is no specific limitation on the shapes of the first heat dissipation holes 9321 and the second heat dissipation holes 9318.

[0230] When the electrical control box 93 is disposed below the second housing 30, in order to avoid increasing the size of the indoor unit 1 in terms of height, an upwardly recessed mounting cavity 18 can be provided at the bottom of the second housing 30. The mounting cavity 18 communicates with the air inlet cavity 11 via the air intake port 14. The mounting cavity 18 comprises a first side wall 181, a second side wall 182, and an exposed opening 183, which are connected together. The exposed opening 183 is downwardly disposed, and the first side wall 181 faces the exposed opening 183. The first side wall 181 extends between the second return air port 143 and the second side wall 182, and the second side wall 182 faces the second return air port 143. The electrical control box 93 is mounted on the first side wall 181. In this way, the electrical control box 93 can be accommodated within the mounting cavity 18 without changing the height of the indoor unit 1, making the indoor unit 1 provided in this embodiment more compact.

[0231] Alternatively, referring to FIG36 , the first side wall 181 is formed by the wall of the shell body 311 away from the diffusion chamber 12, and the second side wall 182 is formed by the wall of the water receiving tray 60 away from the heat exchange chamber 13.

[0232] In some optional embodiments, the mounting cavity 18 is open toward the bottom. Like this, after removing the grid on the ceiling, the electric control box 93 can be exposed, thereby being convenient to dismantling and repairing the electric control box 93.

[0233] As can be seen from the above, the mounting cavity 18 is located to the side of the first return air vent 141, and the first return air vent 141 and the external air intake vent are arranged to overlap in the height direction. In some optional embodiments, at least a portion of the mounting cavity 18 is also arranged to overlap in the height direction of the external air intake vent. In other words, external air can directly enter the mounting cavity 18 through the external air intake vent to dissipate heat from the electrical control box 93, thereby improving the heat dissipation efficiency of the electrical control box 93.

[0234] Since the electrical control box 93 is installed on the first side wall 181, in order to improve the heat dissipation efficiency of the electrical control box 93, the flow resistance of the airflow in the electrical control box 93 can be reduced, for example, the extension direction of the bottom wall of the accommodating cavity 93a is made close to the flow direction of the airflow, and since the electrical control box 93 is installed on the first side wall 181, the extension direction of the first side wall 181 is made close to the flow direction of the airflow. Therefore, in some optional embodiments, the first side wall 181 extends in the height direction, and the first side wall 181 and the second return air outlet 143 extend close to each other from bottom to top. In this way, the extension direction of the first side wall 181 is closer to the flow direction of the airflow, which can reduce the flow resistance of the airflow in the accommodating cavity 93a, increase the flow speed of the airflow, and thereby improve the heat dissipation efficiency of the electrical control box 93.

[0235] Furthermore, to facilitate installation of the electric control box 93 on the first side wall 181, the wall surface of the first side wall 181 can be configured as an inclined wall surface. This not only reduces the flow resistance of the airflow within the accommodating cavity 93a, but also improves the smoothness of the surface of the first side wall 181, thereby facilitating installation of the electric control box 93.

[0236] It should be noted that in some embodiments, the electrical control box 93 and the lower shell of the pressure diffuser 12 can be detachably connected. Specifically, the box body 931 and the lower shell of the pressure diffuser 12 can be detachably connected, for example, via a screw connection and / or a snap connection. It is understood that the electrical control box 93 and the lower shell of the pressure diffuser 12 can be detachably connected via a screw connection, a snap connection, or a combination of a screw connection and a snap connection. The connection method between the box body 931 of the electrical control box 93 and the lower shell of the pressure diffuser 12 is not specifically limited.

[0237] Generally, when inspecting the electric control box 93, the electric control board assembly 933 inside is inspected. Therefore, to facilitate inspection of the electric control board assembly 933, in this embodiment, the box cover 932 and the box body 931 can also be connected in a detachable manner. In this way, if the problem with the electric control board assembly 933 is not serious, only the box cover 932 can be removed from the box body 931 to inspect the electric control board assembly 933.

[0238] Please continue to refer to Figure 37, which is a schematic diagram of the structure of the positioning structure between the electronic control box 93 and the lower shell of the pressure diffuser chamber 12 in the indoor unit 1 provided in an embodiment of the present application. In order to improve the installation efficiency between the electronic control box 93 and the second housing 30, a positioning structure can be provided between the electronic control box 93 and the first side wall 181. The positioning structure is used to limit the relative position between the electronic control box 93 and the lower shell of the pressure diffuser chamber 12. In this way, when installing the electronic control box 93 and the lower shell of the pressure diffuser chamber 12, the position between the electronic control box 93 and the lower shell of the pressure diffuser chamber 12 can be determined first, and then the electronic control box 93 and the lower shell of the pressure diffuser chamber 12 can be connected together using the above-mentioned screw connection structure and snap connection structure.

[0239] In some optional embodiments, the positioning structure includes a positioning post 93b and a positioning slot 93c, with the positioning post 93b inserted into the positioning slot 93c. One of the positioning post 93b and the positioning slot 93c is provided on the side of the housing 931 of the electrical control box 93 facing the second housing 30, and the other of the positioning post 93b and the positioning slot 93c is provided on the side of the lower shell of the pressure diffuser chamber 12 facing the housing 931. In the specific embodiment of this embodiment, the axial direction of the positioning post 93b is aligned with the thickness direction of the electrical control box 93, and the depth direction of the positioning slot 93c is also aligned with the depth direction of the electrical control box 93. The positioning post 93b is provided on the housing 931, and the positioning slot 93c is provided on the lower shell of the pressure diffuser chamber 12. Thus, when the electrical control box 93 is installed on the lower shell of the pressure diffuser chamber 12, the positioning post 93b can be aligned with the positioning slot 93c first, and then the electrical control box 93 and the lower shell of the pressure diffuser chamber 12 can be connected together using the aforementioned screw connection structure and / or snap connection structure.

[0240] In order to further improve the installation efficiency of the electric control box 93, a plurality of positioning posts 93b and a plurality of positioning slots 93c corresponding to the plurality of positioning posts 93b can be provided. Here, there is no limit on the number of positioning posts 93b and the number of positioning slots 93c.

[0241] In some embodiments, to allow for more airflow into the air intake side of the installation cavity 18, the angle between the first side wall 181 and the second side wall 182 can be limited, thereby increasing the opening on the air intake side of the installation cavity 18. Consequently, the angle between the second side wall 182 and the first side wall 181 can be greater than 90 degrees. This allows for a larger opening on the air intake side of the installation cavity 18, ensuring a greater amount of airflow into the electrical control box 93 and allowing more heat generated by the electrical control board assembly 933 to be carried out of the accommodating cavity 93a.

[0242] In other embodiments, the size of the opening of the mounting cavity 18 can be restricted to ensure a sufficient amount of airflow into the electrical control box 93. Specifically, the opening of the mounting cavity 18 gradually decreases from bottom to top. In other words, the opening at the bottom of the mounting cavity 18 is larger, and the opening at the bottom of the mounting cavity 18 is exactly the air inlet side of the mounting cavity 18. Therefore, by restricting the size of the opening of the mounting cavity 18, the airflow on the air inlet side of the mounting cavity 18 can be increased, thereby achieving better heat dissipation for the electrical control box 93.

[0243] Referring to Figures 29 and 31 , in some embodiments, to prevent damage to personnel by the fan 91 and to protect the fan 91, a protective grille 98 may be provided at the air intake 14. One side of the protective grille 98 is connected to the upper shell 21 of the air inlet chamber, and the other side of the protective grille 98 is connected to the lower shell of the diffuser chamber 12. Thus, by providing a grille at the air intake 14, damage to personnel by the fan 91 can be prevented to a certain extent when installing or removing the electrical control box 93. The grille also protects the fan 91, maintaining good performance. Furthermore, it can prevent larger insects or foreign objects from entering the air inlet chamber 11 through the air intake 14.

[0244] The installation of the protective grille 98 may affect the airflow into the installation cavity 18. To avoid this, the protective grille 98 is spaced apart from the electrical control box 93 in the width direction of the indoor unit 1. This significantly reduces the airflow into the installation cavity 18 even with the protective grille 98, ensuring effective heat dissipation from the electrical control box 93. Furthermore, the protective grille 98 can be prevented from interfering with the installation or removal of the electrical control box 93 to a certain extent.

[0245] Specifically, to protect both the first return air inlet 141 and the second return air inlet 143, the protective grille 98 may include a first grille portion 981 and a second grille portion 983 connected together. The first grille portion 981 is provided at the first return air inlet 141, and the second grille portion 983 is provided at the second return air inlet 143. In this way, the entire air intake 14 can be protected and blocked by the protective grille 98, thereby enhancing the protective effect of the protective grille 98 on the fan 91.

[0246] Similarly, to ensure adequate airflow on the inlet side of the installation cavity 18, the distance between the second grille portion 983 and the electrical control box 93 can be limited. For example, the distance between the second grille portion 983 and the electrical control box 93 can be gradually reduced from bottom to top along the width of the indoor unit 1. That is, the distance between the electrical control box 93 and the second grille portion 983 is greatest on the inlet side of the installation cavity 18. This results in a greater airflow on the inlet side of the installation cavity 18 and further mitigates, to a certain extent, the impact of the protective grille 98 on heat dissipation from the electrical control box 93.

[0247] The same or similar numbers in the drawings of this embodiment correspond to the same or similar parts; in the description of this application, it should be understood that if the terms "up", "down", "left", "right", etc. indicate directions or positional relationships, they are based on the directions or positional relationships shown in the drawings. This is only for the convenience of describing this application and simplifying the description, and does not indicate or imply that the device or element referred to must have a specific direction, be constructed and operated in a specific direction. Therefore, the terms describing the positional relationship in the drawings are only used for illustrative purposes and cannot be understood as limiting this application. For ordinary technicians in this field, the specific meanings of the above terms can be understood according to specific circumstances.

[0248] The above are only preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principles of the present application should be included in the scope of protection of the present application.

Claims

1. An air duct assembly is applied to an indoor unit, and the indoor unit includes a fan and a heat exchanger, wherein, The air duct assembly includes a first housing and a second housing. The first housing and the second housing cooperate to define a connected diffuser chamber and a heat exchange chamber. The diffuser chamber is configured to communicate with the downstream of the fan and guide the gas flow to the heat exchange chamber, and the heat exchange chamber is configured to accommodate the heat exchanger; Wherein, the diffuser chamber is located on one side of the heat exchange chamber.

2. The air duct assembly according to claim 1, wherein, Between the diffuser chamber and the heat exchanger, the air duct assembly does not form an obstruction in the flow direction of the air flowing to the heat exchanger.

3. The air duct assembly according to claim 1, wherein, The diffuser chamber does not extend into the heat exchange chamber.

4. The air duct assembly according to claim 3, wherein, Along the direction from the diffuser chamber to the heat exchange chamber, the lateral flow area of the gas in the diffuser chamber is set to increase, and from the diffuser chamber to the heat exchange chamber, the lateral flow area of the gas remains unchanged or increases.

5. The air duct assembly according to claim 4, wherein, Along the direction from the diffuser chamber to the heat exchange chamber, the diffuser chamber is gradually expanding.

6. The air duct assembly according to claim 1, wherein, The first housing includes an upper diffuser chamber housing and an upper heat exchange chamber housing. The upper diffuser chamber housing defines the top wall of the diffuser chamber, and the upper heat exchange chamber housing defines the top wall of the heat exchange chamber. The second housing includes a lower diffuser chamber housing and a water receiving tray. The lower diffuser chamber housing defines the bottom wall of the diffuser chamber, and the water receiving tray defines the bottom wall of the heat exchange chamber; The upper diffuser chamber housing is connected to the upper heat exchange chamber housing, and the lower diffuser chamber housing is connected to the water receiving tray. On the upstream side of the heat exchange chamber, the upper heat exchange chamber housing extends upward relative to the upper diffuser chamber housing, and / or, on the upstream side of the heat exchange chamber, the water receiving tray extends downward relative to the lower diffuser chamber housing to increase the flow area of the gas.

7. The air duct assembly according to claim 6, wherein The upper diffuser chamber housing slopes upward in a direction away from the upper heat exchange chamber housing. The upper heat exchange chamber housing includes a connected top wall and side wall. The side wall is connected between the upper diffuser chamber housing and the top wall, and the side wall extends upward.

8. The air duct assembly according to claim 6, wherein, The lower diffuser chamber housing slopes upward in a direction away from the water receiving tray, and the lower diffuser chamber housing and the water receiving tray are smoothly transitioned.

9. The air duct assembly according to claim 8, wherein, The water receiving tray includes a bottom wall and a side wall. The side wall is connected between the lower diffuser chamber housing and the bottom wall, and an angle greater than or equal to 90 degrees is formed between the lower diffuser chamber housing and the side wall.

10. The air duct assembly according to claim 1, wherein, The first housing includes an upper diffuser chamber housing and an upper heat exchange chamber housing. The upper diffuser chamber housing defines the top wall of the diffuser chamber, and the upper heat exchange chamber housing defines the top wall of the heat exchange chamber. The second housing includes a housing main body and a water receiving tray. The housing main body defines at least part of the bottom wall of the diffuser chamber, and the water receiving tray defines the bottom wall of the heat exchange chamber; Wherein, the upper diffuser chamber housing and the upper heat exchange chamber housing are integrally formed components, and / or, the housing main body and the water receiving tray are integrally formed components.

11. The air duct assembly according to claim 1, wherein, The first housing and the second housing also cooperate to define an air inlet chamber, which is configured to accommodate the fan, and the downstream side of the air inlet chamber communicates with the diffuser chamber; The first housing includes an upper diffuser chamber housing, an upper heat exchange chamber housing, an upper air inlet chamber housing, and a rear air inlet chamber housing. The upper diffuser chamber housing, the upper heat exchange chamber housing, the upper air inlet chamber housing, and the rear air inlet chamber housing are integrally formed components.

12. The air duct assembly according to any one of claims 1 to 11, wherein, The first housing and the second housing further cooperate to define an air inlet cavity, which is configured to accommodate the fan, and the downstream of the air inlet cavity communicates with the diffuser cavity; The air duct assembly further includes a volute tongue disposed at the transition between the air inlet cavity and the diffuser cavity. The volute tongue is configured to guide the air flow from the air inlet cavity to the diffuser cavity, and a plurality of diversion grooves are spaced on one side of the volute tongue facing the air inlet cavity. The diversion grooves extend from the air inlet cavity to the diffuser cavity.

13. The air duct assembly according to claim 12, wherein, The volute tongue includes: A volute tongue body having a main body surface; and A plurality of diversion ribs protruding from the main body surface at intervals along the length direction of the air duct assembly. The space between two adjacent diversion ribs and the main body surface jointly defines the diversion groove.

14. The air duct assembly according to claim 13, wherein, Projecting along the length direction of the air duct assembly, the main body surface part of the bottom of the diversion groove forms a bottom profile line, and the end point of the contour line where the diversion rib extends to the lower housing of the diffuser cavity intersects with the bottom profile line.

15. The air duct assembly according to claim 13, wherein, The connection between the two ends of the diversion rib and the main body surface is smoothly transitioned; And / or, the contour line shape of the diversion rib is configured to be wavy, broken line-shaped or a single arc-shaped protruding away from the volute tongue body.

16. The air duct assembly according to claim 12, wherein, The second housing includes a first split structure and a second split structure. The first split structure and the second split structure are detachably connected, and the first split structure and the second split structure cooperate to configure the bottom wall of the diffuser cavity and part of the inner wall of the air inlet cavity; Wherein, part of the second split structure configures the volute tongue.

17. The air duct assembly according to claim 16, wherein, The first split structure includes: A housing main body; and A support portion connected to one side of the housing main body and detachably connected to the second split structure. The support portion, the housing main body and the second split structure cooperate to configure the bottom wall of the diffuser cavity; Wherein, the support structure and the housing main body are an integral structure, and / or a hollow cavity is formed by enclosing the second split structure and the support portion.

18. The air duct assembly according to claim 1, wherein, The first housing and the second housing further cooperate to define an air inlet cavity communicating with the diffuser cavity, and the air inlet cavity is configured to accommodate the fan; The second housing includes a return channel, a first surface forming the bottom wall of the diffuser cavity, and a second surface forming part of the cavity wall of the air inlet cavity. A first opening is provided on the first surface, and a second opening is provided on the second surface. The return channel extends from the first opening to the second opening.

19. The air duct assembly according to claim 18, wherein, The return channel is curved; And / or, the width dimension of the return channel remains unchanged or gradually expands from the first opening to the direction of the second opening.

20. The air duct assembly according to claim 18, wherein, The extension line of the orientation of the second opening of the return channel passes through the fan, and the included angle with the outer peripheral tangent of the fan is θ, and the θ is less than or equal to 15 degrees and greater than or equal to 0 degrees; Or, the extension line of the orientation of the second opening of the return channel passes through the outside of the fan, and the included angle with the outer peripheral tangent of the fan is β, and the β is less than or equal to 45 degrees and greater than or equal to 0 degrees.

21. The air duct assembly according to claim 20, wherein, The θ is equal to 0 degrees or the β is equal to 0 degrees, so that the extension line of the orientation of the second opening of the return air channel coincides with the outer peripheral tangent of the fan.

22. The air duct assembly according to claim 18, wherein, The second housing includes: a housing main body provided with the first surface; a support portion connected to a side of the housing main body facing away from the first surface, and one side of the support portion is configured as a first air return surface; and a deflector connected to a side of the housing main body facing away from the first surface and spaced from the support portion. A side of the deflector facing the support portion is configured as a second air return surface. The second air return surface and the first air return surface cooperate to form the return air channel. A second surface is provided at an end of the deflector away from the housing main body.

23. The air duct assembly according to claim 22, wherein, The deflector includes a connecting portion, a deflecting portion, and a cavity wall portion. The connecting portion is laminated on a side of the housing main body facing away from the first surface and is detachably mounted on the housing main body. The deflecting portion is connected to the connecting portion and is disposed at an angle to the connecting portion. The cavity wall portion is connected to an end of the deflecting portion facing away from the connecting portion and extends in a direction away from the housing main body. The cavity wall portion is disposed at an angle to the deflecting portion. The cavity wall portion has the second surface. The first housing and at least the cavity wall portion define the air inlet cavity.

24. The air duct assembly according to claim 23, wherein, A grille is further included, which is detachably connected to the cavity wall portion and covers the air inlet side of the air inlet cavity.

25. An indoor unit, wherein, It includes a fan, a heat exchanger, and an air duct assembly according to any one of claims 1 to 24. The first housing and the second housing further cooperate to define an air inlet cavity communicating with the diffuser cavity. The fan is received in the air inlet cavity, and the heat exchanger is received in the heat exchange cavity.

26. The indoor unit according to claim 25, wherein, The indoor unit is a duct machine, and the fan is a cross-flow fan.

27. The indoor unit according to claim 25, wherein, The first housing and the second housing further define an air outlet communicating with the heat exchange cavity. The heat exchanger is arranged in an arc shape arched towards the air outlet. Among them, the central axis of the diffuser cavity passes through the arc top of the heat exchanger.

28. The indoor unit according to claim 27, wherein, A plurality of refrigerant pipes perpendicular to the air outlet direction are arranged in the heat exchanger. Along the up-and-down direction of the installation environment, the number of refrigerant pipes in the middle of the heat exchanger is more than that at the upper and lower ends of the heat exchanger; and / or, the orientation of the air outlet is the horizontal direction.

29. The indoor unit according to claim 25, wherein, The first housing and the second housing further cooperate to define an air suction port communicating with the air inlet cavity, and at least part of the air suction port faces downward.

30. The indoor unit according to claim 29, wherein, It further includes: an electric control box installed outside the second housing, and part of the air suction port is located between the fan and the electric control box.

31. A heating, ventilation, and air conditioning (HVAC) system, wherein, It includes an outdoor unit and an indoor unit according to any one of claims 24 to 30. The outdoor unit and the heat exchanger form a refrigerant cycle.

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