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

Abstract

An air duct assembly (10), an indoor unit, and a heating and ventilation apparatus (1). The air duct assembly (10) is provided with an air intake chamber (11) and a diffuser chamber (12), which are in communication with each other, wherein a volute tongue (41a) is provided at the transition joint of the air intake chamber (11) and the diffuser chamber (12); the air intake chamber (11) is configured to accommodate a fan (91), which drives an external airflow to enter the air intake chamber (11); the volute tongue (41a) comprises a volute tongue main body (41a1), which faces the fan (91) and guides the airflow to enter the diffuser chamber (12); and the cross-sectional area of the diffuser chamber (12) is gradually increased in the direction of airflow.

Description

Duct components, indoor units and HVAC equipment

[0001] This application claims priority to the Chinese patent application with application number 2024100463223 and invention name “Snail tongue, air duct assembly, indoor unit and HVAC equipment” submitted to the China Patent Office on January 11, 2024, and the Chinese patent application with application number 2024100463011 and invention name “Air duct assembly and duct machine”, all 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 HVAC equipment. Background Art

[0003] HVAC equipment often includes duct air conditioners, which have the advantages of low cost and easy maintenance.

[0004] In related technologies, HVAC equipment forms air ducts for circulating air. The airflow from the fan has poor gas flow performance within the ducts, resulting in loud noise and low efficiency during air delivery, significantly affecting the user experience. Summary of the Invention

[0005] The embodiments of the present application provide an air duct assembly, an indoor unit, and HVAC equipment, which can improve gas flow performance and improve air supply efficiency.

[0006] In the first aspect, the air duct assembly has an air inlet chamber and a pressure diffuser chamber that are connected to each other. A volute tongue is provided at the junction of the air inlet chamber and the pressure diffuser chamber. The air inlet chamber is configured to accommodate a fan, and the fan drives external airflow into the air inlet chamber. The volute tongue includes a volute tongue body, which faces the fan and guides the airflow into the pressure diffuser chamber. The cross-sectional area of ​​the pressure diffuser chamber gradually increases along the direction of the airflow.

[0007] In one embodiment, the volute tongue member comprises:

[0008] A first split structure includes a supporting portion and a first connecting portion connected to each other, wherein the first connecting portion is provided on a side of the supporting portion facing the fan; and

[0009] The second split structure is formed separately from the first split structure, and includes a connected volute tongue body and a second connecting portion. The second connecting portion is arranged on a side of the volute tongue body away from the fan and is detachably connected to the first connecting portion.

[0010] In one embodiment, the support portion and the volute tongue body are spaced apart, and the support portion, the volute tongue body, the first connecting portion and the second connecting portion are configured to form a hollow cavity.

[0011] In one embodiment, the volute tongue body further includes a plurality of guide ribs, the volute tongue body has a first volute tongue guide surface, and is extended along the axial direction of the fan, and the plurality of guide ribs are protruded on the first volute tongue guide surface at intervals along the extension direction of the volute tongue body, and two adjacent guide ribs and the first volute tongue guide surface define a guide groove.

[0012] In one embodiment, the volute tongue body includes a first plate segment and a second plate segment connected to each other, the first plate segment and the second plate segment cooperate to define the first volute tongue guide surface, the first plate segment is configured to extend toward the first split structure, and the second plate segment is configured to face the fan, and the extension direction of the first plate segment and the extension direction of the second plate segment are arranged at an angle;

[0013] The guide rib includes a first rib segment and a second rib segment connected to each other. The first rib segment is arranged on the first plate segment, and an end thereof is connected to the first volute tongue guide surface. The second rib segment is arranged on the second plate segment.

[0014] In one embodiment, the second connecting portion includes a third plate segment and a fourth plate segment respectively provided at the upper and lower ends of the volute tongue main body, and the third plate segment and the fourth plate segment are both extended toward the support portion, and the third plate segment, the fourth plate segment and the volute tongue form a connecting groove, and the first connecting portion is located in the connecting groove and elastically abuts against the inner wall surfaces of the third plate segment and the fourth plate segment.

[0015] In one embodiment, the distance between the third plate segment and the fourth plate segment gradually decreases in a direction approaching the supporting portion.

[0016] In one embodiment, the first connecting portion includes a fifth plate segment and a sixth plate segment provided at upper and lower ends of the supporting portion, and the fifth plate segment and the sixth plate segment both extend toward the volute tongue body;

[0017] The fifth plate segment abuts against the inner surface of the third plate segment, and the sixth plate segment abuts against the inner surface of the fourth plate segment.

[0018] In one embodiment, the third plate segment is provided with a first buckle position, the fourth plate segment is provided with a second buckle position, the fifth plate segment is provided with a first buckle, and the sixth plate segment is provided with a second buckle, the first buckle is engaged with the first buckle position, and the second buckle is engaged with the second buckle position;

[0019] And / or, the volute tongue body and the support portion are spaced apart to define a hollow cavity between the volute tongue body and the support portion.

[0020] In one embodiment, the volute tongue body has a first volute tongue guide surface, and the second connecting portion includes a third plate segment connected to one end of the volute tongue, the third plate segment extending toward the support portion, and the outer surface of the third plate segment forming a second volute tongue guide surface, and the second volute tongue guide surface is smoothly connected to the first volute tongue guide surface;

[0021] The support portion has a first surface, the first connecting portion cooperates with the support portion to form a first step structure lower than the first surface, and the third plate segment overlaps the first step structure so that the second volute tongue guide surface is higher than the first surface or flush with the first surface.

[0022] In one embodiment, the second connecting portion further comprises a fourth plate segment connected to an end of the volute tongue body away from the third plate segment, and the fourth plate segment extends toward the supporting portion;

[0023] The support portion also has a second surface arranged at an angle to the first surface, and the first connecting portion also cooperates with the support portion to form a second step structure, and the fourth plate segment overlaps the second step structure so that the outer surface of the fourth plate segment is flush with the second surface.

[0024] In one embodiment, the second connecting portion further includes a fourth plate segment connected to an end of the volute tongue body away from the third plate segment, the fourth plate segment extending toward the support portion, and the fourth plate segment forming a third step structure;

[0025] The supporting portion further includes a second surface arranged at an angle to the first surface, and the first connecting portion further includes a sixth plate segment connected to one end of the supporting portion, the sixth plate segment extending toward the volute tongue body, and the outer surface of the sixth plate segment being smoothly connected to the second surface, the sixth plate segment being overlapped on the third step structure so that the outer surface of the sixth plate segment is higher than the outer surface of the fourth plate segment or flush with the outer surface of the fourth plate segment.

[0026] In one embodiment, the invention comprises a first shell and a second shell, wherein the second shell comprises an air inlet chamber front shell, a pressure diffuser chamber lower shell, and a water receiving tray, and opposite sides of the pressure diffuser chamber lower shell are respectively connected to the water receiving tray and the air inlet chamber front shell;

[0027] The first housing cooperates with at least the front housing of the air inlet chamber to define the air inlet chamber, cooperates with at least the lower housing of the pressure diffuser chamber to define the pressure diffuser chamber, and cooperates with the water receiving tray to define a heat exchange chamber, and the air inlet chamber, the pressure diffuser chamber, and the heat exchange chamber are sequentially connected;

[0028] Wherein, the first split structure is arranged on a side of the lower shell of the diffuser chamber away from the water receiving tray, and is located above the front shell of the air inlet chamber.

[0029] In one embodiment, the diffuser chamber lower shell includes a shell body, two opposite sides of the shell body are connected to the water receiving tray and the air inlet chamber front shell, and a side of the shell body away from the water receiving tray is connected to the first split structure;

[0030] Wherein, the first split structure and the shell body are an integrated structure.

[0031] In one embodiment, the volute tongue member includes:

[0032] The volute tongue body is configured to guide the airflow from the air inlet cavity to the pressure diffuser cavity. The volute tongue body has a first volute tongue guide surface. The first volute tongue guide surface is configured to be sequentially adjacent to a first windward section and a first wind guiding section. When projected along the length direction of the air duct assembly, the contour line of the first windward section is connected to the profile line of the air inlet cavity. The first wind guiding section has a first arc-shaped contour line. The bottom wall of the pressure diffuser cavity is configured as a pressure diffuser section. The profile line of the pressure diffuser section is arranged in a straight line and has a first straight contour line. The first arc contour line overlaps with the starting point of the first straight contour line.

[0033] A plurality of guide ribs are protruded on the first volute tongue guide surface at intervals along the length direction of the air duct assembly, and each of the guide ribs is constructed into a second windward section and a second wind guiding section. The second windward section is arranged on the first windward section, and the second wind guiding section is arranged on the first wind guiding section. When projected along the length direction of the air duct assembly, the end point of the contour line of the second wind guiding section does not exceed the starting point of the first straight contour line.

[0034] In one embodiment, the first straight contour line is tangent to the first arc contour line.

[0035] In one embodiment, the second air guide segment has a second arc contour line and a second straight contour line, the first arc contour line and the second arc contour line are arranged correspondingly, and the second straight contour line extends from the end point of the second arc contour line and ends at the end point of the first arc contour line.

[0036] In one embodiment, the first windward section and the first wind guiding section are both arranged with arc-shaped contour lines, the normal vector direction of the arc vertex of the first windward section is away from the air inlet cavity, and the normal vector direction of the arc vertex of the first wind guiding section is toward the air inlet cavity.

[0037] In one embodiment, the second windward section is set in an arc-shaped contour line, the second wind-guiding section has a second arc-shaped contour line and a second straight contour line, the first arc-shaped contour line and the second arc-shaped contour line are set correspondingly, the first arc-shaped contour line corresponds to the second arc-shaped contour line, and the second straight contour line starts from the end point of the second arc-shaped contour line and ends at the end point of the first arc-shaped contour line.

[0038] In one embodiment, a concave cavity is provided on the inner wall of the air inlet cavity, and the concave cavity is adjacent to the first windward section and is located upstream of the first windward section.

[0039] In one embodiment, two adjacent guide ribs and the first volute tongue guide surface jointly define a guide groove;

[0040] Among them, when projected along the length direction of the air duct assembly, the first windward section and part of the first wind-guiding section of the bottom of the guide groove constitute the groove bottom profile line, and the end point of the contour line of the second wind-guiding section intersects with the groove bottom profile line.

[0041] In one embodiment, the diffuser section is connected to the first air guide section and an intersection line is formed at the connection point;

[0042] Wherein, the end point of the groove bottom profile does not exceed the intersection line.

[0043] In one embodiment, the contour line of the guide rib is configured to be in a wave shape, a broken line shape, or a single arc shape that bulges away from the volute tongue body.

[0044] In one embodiment, the plurality of guide ribs are all located on one side of the diffuser section.

[0045] In one embodiment, the end of the second air guide section extending toward the diffuser section forms a smooth transition with the connection to the first air guide section; and / or,

[0046] The end of the second windward section extending toward the air inlet cavity forms a smooth transition with the connection between the end and the first windward section.

[0047] In a second aspect, the indoor unit includes a fan and an air duct assembly as described in any one of the above items, and the fan is accommodated in the air inlet cavity.

[0048] In a third aspect, a HVAC device includes an outdoor unit and an indoor unit as described in claim 1, wherein the outdoor unit and the indoor unit form a refrigerant cycle.

[0049] In one embodiment, the air duct assembly is further provided with an air return port communicating with the air inlet cavity and an air outlet communicating with the heat exchange cavity, and the indoor unit is further provided with:

[0050] an air duct inlet portion connected to the bottom of the air duct assembly and having an air duct inlet interface, the air duct inlet interface being connected to the return air port, and at least a portion of the outer wall surface of the pressure diffuser cavity being exposed to the air duct inlet interface; and

[0051] The air duct outlet portion is connected to one side of the air duct assembly and has an air duct outlet interface, and the air duct outlet interface is connected to the air outlet.

[0052] In an embodiment of the present application, a volute tongue is provided at the junction of the air inlet chamber and the diffuser chamber. The volute tongue can stabilize the airflow and increase the cross-flow area, thereby increasing the flow rate and pressure head of the fan and improving the air supply efficiency. Furthermore, by providing a diffuser chamber with a gradually increasing cross-sectional area, the present application gradually reduces the flow rate of the gas as it flows within the diffuser chamber, reducing the dynamic pressure. While the dynamic pressure of the gas decreases, the static pressure of the gas increases, resulting in a higher static pressure when the gas flows out of the air outlet. This effectively increases the static pressure level at the air outlet of the air duct assembly and increases the air supply distance. Furthermore, as the gas flow rate slows down, the noise during air supply will also be effectively reduced, improving the air supply effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0053] 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.

[0054] FIG1 is a schematic structural diagram of an indoor unit according to an embodiment of the present application;

[0055] FIG2 is a schematic diagram of the exploded structure of the indoor unit in FIG1 ;

[0056] FIG3 is a front view schematic diagram of the indoor unit in FIG1 ;

[0057] FIG4 is a schematic top view of the internal structure of an indoor unit according to an embodiment of the present application;

[0058] FIG5 is a schematic diagram of an exploded structure of another embodiment of the indoor unit in FIG1 ;

[0059] FIG6 is a schematic cross-sectional structural diagram of the indoor unit at section AA in FIG3 ;

[0060] FIG7 is a schematic diagram of the exploded structure of a portion of the volute tongue according to an embodiment of the present application;

[0061] FIG8 is a schematic structural diagram of the second housing of the present application;

[0062] FIG9 is an enlarged schematic diagram of the structure at point C in FIG6 ;

[0063] FIG10 is a schematic structural diagram of an indoor unit according to an embodiment of the present application;

[0064] FIG11 is a schematic diagram of the exploded structure of the indoor unit shown in FIG10 ;

[0065] FIG12 is a cross-sectional view of a portion DD shown in FIG10;

[0066] FIG13 is a partial schematic diagram of the cross-sectional view shown in FIG12;

[0067] FIG14 is a schematic diagram of a partial structure of the second housing shown in FIG11;

[0068] FIG15 is a partial enlarged view of point B in FIG14;

[0069] FIG16 is a schematic diagram of a partially exploded structure of the second housing shown in FIG11 ;

[0070] FIG17 is a schematic diagram of a partial structure of the second shell shown in FIG11 from a top view.

[0071] Explanation of the accompanying figures: 1. HVAC equipment; 10. Air duct assembly; 11. Air inlet chamber; 12. Diffuser chamber; 121. Diffuser section; 1211. First straight contour line; 13. Heat exchange chamber; 14. Return air outlet; 15. Air outlet; 16. Hollow cavity; 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; 24. Upper insulation sponge; 25. Rear shell of air inlet chamber; 30. Second shell; 31. Front shell of air inlet chamber; 41. Second split structure; 41a. Snail tongue; 41a1. Snail tongue body; 41b. Second connecting portion; 411. First snail tongue guide Surface; 412, second volute tongue guide surface; 413, first plate segment; 414, second plate segment; 415, third plate segment; 4151, first buckle position; 416, fourth plate segment; 417, first windward segment; 418, first wind-guiding segment; 419, first arc contour line; 42, guide rib; 421, first rib segment; 422, second rib segment; 423, second windward segment; 424, second wind-guiding segment; 425, second arc contour line Contour line; 426, second straight contour line; 43, guide groove; 431, groove bottom profile; 45, first split structure; 45a, support portion; 45a1, first surface; 45a3, second surface; 45b, first connecting portion; 45c, first step structure; 45d, second step structure; 45e, connecting groove; 453, fifth plate segment; 4531, first buckle; 454, sixth plate segment; 455, seventh plate Segment; 456, eighth plate segment; 46, concave cavity; 47, intersection line; 50, diffuser chamber lower shell; 51, shell body; 60, water tray; 70, side panel; 80, lower insulation sponge; 91, fan; 91a, air inlet side; 91b, air outlet side; 911, impeller; 913, motor; 92, heat exchanger; 921, refrigerant pipe; 93, electrical control box; 98, grille; 981, first grille; 983, second grille. 2, duct inlet; 2a, duct inlet port; 3, duct outlet; 3a, duct outlet port.

[0072] 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

[0073] 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.

[0074] 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.

[0075] 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.

[0076] 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.

[0077] First embodiment

[0078] Referring to Figures 1 and 2 , the present application provides a heating and ventilation system 1, which can be a ducted air conditioner or a ducted air conditioner. The heating and ventilation system 1 includes an indoor unit and an outdoor unit, which are connected via cables, pipes, and the like to operate together to regulate the indoor environment. As will be understood, the indoor unit is located indoors, typically in a suspended ceiling installation, and is used to supply air to the room. The indoor unit includes an air duct assembly 10, a fan 91, a heat exchanger 92, and an electrical control box 93.

[0079] The air duct assembly 10 is used to construct an air duct suitable for the indoor unit of the HVAC equipment 1 for gas flow. Specifically, the air duct assembly 10 is a structure mainly composed of a shell, and its outer contour can be roughly rectangular, and has an up-down direction ZZ, a front-back direction YY, and a left-right direction XX, and the up-down direction ZZ, the front-back direction YY, and the left-right direction XX are arranged at an angle to each other. Please refer to Figures 3 to 6. 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 connected in sequence, and is formed with a return air port 14 connected to the air inlet chamber 11 and an air outlet 15 connected to the heat exchange chamber 13, so that the gas can enter the air duct assembly 10 from the return air 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.

[0080] The fan 91 is arranged in the air inlet chamber 11, and is capable of extracting gas from the return air port 14 and performing work on it so that it flows to the diffuser chamber 12 at a faster flow rate, thereby providing power for the gas circulation in the above-mentioned air duct. The fan 91 can be a cross-flow fan, a centrifugal fan, an axial flow fan, etc. As shown in FIG4 , taking a cross-flow fan 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 side panel 70, 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 inlet 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 diffuser chamber 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 air to flow from the air inlet side 91a to the air outlet side 91b. The cross-flow fan has the advantages of energy saving, large air volume, low noise and simple installation.

[0081] 5 and 6 , the heat exchanger 92 is housed within 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, a plurality of refrigerant pipes 921 are provided within the heat exchanger 92. When the gas passes through the heat exchanger 92, it exchanges heat with the refrigerant within the pipes, thereby reducing its temperature and forming low-temperature air. To increase the heat exchange area of ​​the heat exchanger 92, the heat exchanger 92 can be arranged in a shaped, arc-shaped, or wavy shape and can be composed of a single heat exchange plate or a combination of multiple heat exchange plates.

[0082] The electrical control box 93 houses an electrical control board assembly, which integrates a variety of electronic components. These components are used to electrically connect to the fan 91 and other devices, and to provide overall control over the indoor unit's overall operating status. Inevitably, these electronic components generate a significant amount of heat during operation. In this embodiment of the present application, the electrical control box 93 can be positioned within the air duct formed by the air duct assembly 10, or positioned close to the air duct, to dissipate heat from the electrical control box 93 to a certain extent through the air duct. This prevents component malfunctions or damage caused by overheating of the electrical control board assembly, thereby improving the indoor unit's operational stability and extending its service life.

[0083] Optionally, the return air inlet 14 is provided with an opening facing downward, and the air outlet 15 is provided with an opening facing forward. The indoor unit further includes an air duct inlet 2 and an air duct outlet 3, wherein the air duct inlet 2 is connected to the bottom of the air duct assembly 10, and the air duct outlet 3 is connected to the front side of the air duct assembly 10. The air duct inlet 2 can be formed by a circle of panels extending downward from the air duct assembly 10 to facilitate the connection of the air inlet duct. The air duct inlet 2 has an air duct inlet interface 2a, which is connected to the return air inlet 14, so that the airflow in the air inlet duct can enter the air inlet chamber 11 through the air duct inlet interface 2a and the return air inlet 14. At least a portion of the outer wall of the pressure diffuser chamber 12 is exposed at the air duct inlet interface 2a. The electrical control box 93 can be provided on the outer wall of the pressure diffuser chamber 12 exposed at the air duct inlet interface 2a. In this way, the electrical control box 93 can be easily and quickly inspected after the air inlet duct at the air duct inlet interface 2a is removed. Similarly, the air duct outlet portion 3 is composed of a circle of panels extending forward from the air duct assembly 10 to facilitate the connection of the air outlet duct. The air duct outlet portion 3 also has an air duct outlet interface 3a, which is connected to the air outlet 15 so that the air flow in the heat exchange chamber 13 can enter the air outlet duct through the air outlet 15 and the air duct outlet interface 3a.

[0084] Please refer to Figure 5. In some embodiments of the present application, in order to facilitate the assembly of the indoor unit, the air duct assembly 10 includes a first shell 20 and a second shell 30 that are connected. The first shell 20 and the second shell 30 can be made of metal materials such as aluminum alloy or stainless steel to meet the requirements of high strength and corrosion resistance. Alternatively, the first shell 20 and the second shell 30 can also be made of plastic materials to achieve the lightweight of the air duct assembly 10. This is not limited in the present application. For example, the air duct assembly 10 can adopt a combination of a first shell 20 made of metal and a second shell 30 made of plastic. In addition, the embodiments of the present application do not limit the connection method of the first shell 20 and the second shell 30. They can be connected individually or in combination by means of clamping, riveting, welding and bolting.

[0085] Referring to Figures 2 and 5 , 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. The cover 20a is generally positioned above the two side panels 70 and is connected to the two side panels 70 on either side of the cover 20a along the left-right direction XX. From back to front in the front-to-back direction YY, the cover 20a includes an air inlet chamber rear shell 25, an air inlet chamber upper shell 21, a pressure diffuser chamber upper shell 22, and a heat exchange chamber upper shell 23, which are connected in sequence. The second housing 30 is spaced apart from the cover 20a in the top-to-bottom direction ZZ and includes a connected air inlet chamber front shell 31, a pressure diffuser chamber lower shell 50, and a water tray 60. The air inlet chamber rear shell 25 and the air inlet chamber front shell 31 are spaced apart in the front-to-back direction YY. The air inlet chamber rear shell 25, the air inlet chamber upper shell 21, the air inlet chamber front shell 31, and the side panels 70 define the air inlet chamber 11. The pressure diffuser chamber upper shell 22 defines the pressure diffuser chamber 12 together with at least the pressure diffuser chamber lower shell 50 and the side panels 70 , while the heat exchange chamber upper shell 23 defines the heat exchange chamber 13 together with the water receiving tray 60 and the side panels 70 .

[0086] Referring to Figures 5 and 6 , the fan 91 is disposed within the air inlet chamber 11 and extends along the left-right direction XX. The air inlet side 91a of the fan 91 faces the entrance of the air inlet chamber 11, and the entrance of the air inlet chamber 11 is connected to the return air port 14, thereby enabling the fan 91 to draw air near the return air port 14 through the return air port 14. In one embodiment, the fan 91 is a cross-flow fan 91, and the air outlet side 91b of the impeller 911 (fan 91) is connected to the diffuser chamber 12. Gas radially passes through the impeller 911 from the air inlet side 91a, enters the interior of the impeller 911, and then radially flows out from the air outlet side 91b of the impeller 911 to the diffuser chamber 12. During this process, the gas forms an airflow vortex (eccentric vortex) centered near the volute tongue 41a. The volute tongue 41a is arranged on the air outlet side 91b of the impeller 911, and is used to divide the airflow on the air outlet side 91b. It also plays a role in stabilizing the eccentric vortex, which can reduce the circulation of the gas and increase the through-flow area, thereby increasing the flow rate and pressure head of the fan 91.

[0087] Referring to Figure 6 , along the front-to-back direction YY, that is, from the diffuser chamber 12 to the heat exchange chamber 13, the diffuser chamber 12 is configured to gradually expand, and the lateral flow area of ​​the gas within the diffuser chamber 12 gradually increases. As the lateral flow area of ​​the gas gradually increases, the gas flow rate gradually decreases, the dynamic pressure decreases, and the static pressure increases. The higher static pressure helps the airflow out of the air outlet 15 more effectively overcome air resistance, allowing it to reach a greater distance relative to the air outlet 15.

[0088] The air duct assembly 10 also includes a grille 98, which connects the lower end of the air inlet chamber rear shell 25 and the lower end of the air inlet chamber front shell 31. A plurality of through holes are formed on the grille 98, through which the gas passing through the return air port 14 can enter the air inlet chamber 11. The provision of the grille 98 can effectively prevent larger foreign matter from entering the air inlet chamber 11 and affecting the operation of the fan 91. The grille 98 is arranged in a grid shape to maximize the through holes and reduce the impact on the airflow. Optionally, the grille 98 can be arranged in an arc shape as a whole; or, the grille 98 can also include a first grille 981 and a second grille 983 arranged at an angle, the first grille 981 connected to the lower end of the air inlet chamber rear shell 25 and extending forward along the front-to-back direction YY, the second grille 983 connected to the end of the first grille 981 away from the air inlet chamber rear shell 25 and extending upward, and the end of the second grille 983 away from the first grille 981 connected to the air inlet chamber front shell 31. The first grille 981 and the second grille 983 can be an integral structure, which provides good integrity and is easy to process. Alternatively, the first grille 981 and the second grille 983 can be separate structures and connected by bolts or welding. The first grille 981 and the second grille 983 are arranged at an angle to each other and are farther away from the fan 91. There is ample space between the air inlet side 91a of the fan 91 and the grille 98, which makes it easier for the fan 91 to draw air.

[0089] In the embodiment of the present application, a volute tongue member 41a is provided at the junction of the air inlet chamber 11 and the pressure diffuser chamber 12. The volute tongue member 41a can stabilize the airflow and increase the cross-flow area, thereby increasing the flow rate and pressure head of the fan 91 and improving the air supply efficiency. In addition, the present application provides a pressure diffuser chamber 12 with a gradually increasing cross-sectional area. When the airflow flows in the pressure diffuser chamber 12, 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 increasing the static pressure level at the air outlet 15 of the air duct assembly 10 and increasing the air supply distance. In addition, the gas flow rate is slowed down, and the noise during air supply will also be effectively reduced, thereby improving the air supply effect.

[0090] In the related art, the volute tongue is often configured as an integral structure and formed by methods such as injection molding. The volute tongue has a length direction (axial direction). If the volute tongue is injection molded, the presence of the volute tongue's connecting parts with other structures will hinder the volute tongue from being demolded along its own length, making demolding difficult and reducing production efficiency.

[0091] In view of this, please refer to Figure 7. In some embodiments of the present application, the air duct assembly 10 is provided with a first split structure 45 and a second split structure 41 separately formed from the first split structure 45 at the junction of the air inlet chamber 11 and the diffuser chamber 12. A portion of the second split structure 41 is formed as a volute tongue body 41a1 of the volute tongue member 41a.

[0092] Specifically, please refer to Figures 7 to 9. In some structural forms, the shell body 51 is the main structure of the lower shell 50 of the diffuser chamber, and the opposite sides of the shell body 51 are connected to the front shell 31 of the air inlet chamber and the water receiving tray 60. The first split structure 45 is connected to the end of the shell body 51 away from the water receiving tray 60, and is located above the front shell 31 of the air inlet chamber. The first split structure 45 is used to provide support for the volute body. Optionally, as shown in Figure 8, the shell body 51 and the first split structure 45 can be an integral structure, that is, the first split structure 45 is molded together with the shell body 51. In this way, the connection firmness between the shell body 51 and the first split structure 45 can be improved, and the assembly steps of the shell body 51 and the first split structure 45 can be reduced, thereby improving production efficiency. Of course, the two can also be split structures and fixed by gluing, snap connection, etc., and this application does not limit this. The second split structure 41 is provided on the first split structure 45 and has a first volute tongue guide surface 411 facing the fan 91 for guiding the airflow.

[0093] Referring to Figures 7 to 9, the first split structure 45 includes a connected support portion 45a and a first connecting portion 45b. The support portion 45a is used to connect to the housing body 51, and the first connecting portion 45b is located on the side of the support portion 45a facing the impeller 911 of the fan 91, for mating with the second split structure 41. Accordingly, the second split structure 41 includes a connected volute 41a and a second connecting portion 41b. The volute 41a faces the impeller 911 and extends axially along the impeller 911. The first volute guide surface 411 is located on the side of the volute 41a facing the impeller 911. The second connecting portion 41b is located between the volute 41a and the support portion 45a and is detachably connected to the first connecting portion 45b.

[0094] Among them, the first connecting part 45b and the second connecting part 41b can be connected by one or more of the following methods: bolt connection, snap connection, etc., and this application does not impose any restrictions on this. However, in an optional embodiment, the first connecting part 45b and the second connecting part 41b are connected by snap connection. For example, the first connecting part 45b is provided with a protruding snap structure, and the second connecting part 41b has a latching structure corresponding to the snap structure. The number and arrangement of the snap structures and the latching structures are not limited. For example, the snap structure can be provided in the middle or at both ends of the support part 45a along the up and down direction ZZ, and the number can be one or two, etc. The setting position of the latching structure is one-to-one opposite to the snap structure, so that the snap structure and the latching structure can be matched and connected in a one-to-one correspondence.

[0095] Furthermore, a connecting groove 45e can be provided on the second connecting portion 41b, opening toward the support portion 45a, with the first connecting portion 45b extending into the connecting groove 45e through the aforementioned opening. The first connecting portion 45b can be filled into the connecting groove 45e, and the first connecting portion 45b can be configured to be elastic. When the first connecting portion 45b is located within the connecting groove 45e, the surface of the first connecting portion 45b elastically abuts against the inner wall of the connecting groove 45e that encloses the opening. This allows for a tight fit between the first connecting portion 45b and the second connecting portion 41b, thereby providing a relatively tight fit and connection between the second split structure 41 and the first split structure 45. Of course, in other structural forms, the first connecting portion 45b can also be provided with a connecting groove 45e opening toward the volute tongue member 41a, with the second connecting portion 41b extending into the connecting groove 45e. Such connection methods and effects are not further described here.

[0096] Obviously, by configuring the structure of the volute tongue member 41a as two detachably connected parts, the second split structure 41 and the first split structure 45, the first split structure 45 and the second split structure 41 can be separately processed and formed, with the volute tongue member 41a formed from the portion of the second split structure 41. This allows the first split structure 45 and the second split structure 41 to be demolded separately. For example, if the cross-sectional shape of the second split structure 41 along the left-right direction XX is uniform and constant, then after injection molding, the second split structure 41 can be demolded axially, i.e., along the length of the volute tongue member 41a itself. Regarding the first split structure 45, since it is provided with related structures for mating and connecting with the shell body 51, the first split structure 45 can be demolded radially, i.e., perpendicular to the length of the volute tongue member 41a itself, after injection molding. In the actual production process, demolding and reassembling the first split structure 45 and the second split structure 41 separately is beneficial to processing a more complex volute tongue structure, and is more efficient than directly demolding the integrally formed volute tongue.

[0097] Relatively speaking, it is relatively simple to design molds for the first split structure 45 and the second split structure 41 separately, thereby reducing costs. The first split structure 45 can also be integrally molded with other structures (such as the shell body 51), that is, the first split structure 45 is integrated with the other structure and manufactured together when the other structure is formed and demolded.

[0098] Furthermore, different second split structures 41 can be selected and matched according to specific actual usage conditions. When replacement is required, the second split structure 41 can be simply disassembled and assembled from the first split structure 45, making the structure more flexible and improving its applicability. Alternatively, when maintenance is required on the volute member 41a, maintenance personnel can also disassemble and assemble the second split structure 41 from the first split structure 45, improving the convenience of disassembly and maintenance.

[0099] Referring to Figures 7 and 9, in some embodiments of the present application, the volute tongue member 41a is arranged to extend along the axial direction of the impeller 911. The volute tongue member 41a includes a first plate segment 413 and a second plate segment 414 connected to each other. The first plate segment 413 is configured to extend toward the diffuser chamber lower shell 50, and the second plate segment 414 is configured to face the fan 91 and extend approximately in the up-down direction. The extension direction of the first plate segment 413 and the extension direction of the second plate segment 414 are arranged at an angle. The first plate segment 413 and the second plate segment 414 cooperate to define a first volute tongue guide surface 411. Optionally, the first volute tongue guide surface 411 is arranged in an arc shape, and the airflow blown out by the fan 91 will flow into the diffuser chamber 12 under the guidance of the first volute tongue guide surface 411.

[0100] Referring to Figure 7 , to reduce airflow noise, the volute member 41a is further provided with a plurality of guide ribs 42. These guide ribs 42 are elongated and protrude from the first volute guide surface 411 at intervals along the extension direction of the volute member 41a. The guide ribs 42 can be integral with the second sub-structure 41, for example, through integral injection molding. This improves the secure connection between the two and reduces assembly steps. Alternatively, the guide ribs 42 can be separate from the second sub-structure 41 and secured via adhesive or snap-fit ​​connections.

[0101] In one embodiment, the guide rib 42 includes a first rib segment 421 and a second rib segment 422. The first rib segment 421 and the second rib segment 422 both have a head end and a tail end. The first rib segment 421 is arranged on the first plate segment 413, and the tail end is connected to the first volute tongue guide surface 411. The second rib segment 422 is arranged on the second plate segment 414. The head end of the first rib segment 421 is connected to the head end of the second rib segment 422, and the tail end of the second rib segment 422 is connected to the first volute tongue guide surface 411.

[0102] Two adjacent guide ribs 42 and the first volute tongue guide surface 411 define a guide groove 43. When the fan 91 is in operation, part of the airflow it delivers is directed toward the first plate segment 413 and part toward the second plate segment 414. The airflow directed toward the first plate segment 413 is guided by the first rib segment 421 toward the diffuser 12, while the airflow directed toward the second plate segment 414 is guided along the second rib segment 422, preventing this portion of the airflow from circulating near the volute tongue 41a.

[0103] As the wind blown by the fan 91 passes through the second split structure 41, the presence of the guide groove 43 separates the noisy wind flow, thereby reducing the energy of the noise and improving the user experience. The multiple guide ribs 42 guide the wind flow in the axial direction, thereby reducing the pressure loss of the wind flow as it flows toward the air outlet 15.

[0104] Obviously, when the volute tongue member 41a includes guide ribs 42, in the case of an integral molding process, the multiple guide ribs 42 arranged along the length of the volute tongue member 41a will undoubtedly further restrict the axial ejection of the volute tongue member 41a. In other words, the separately molded second and first sub-structures 41, 45 of the present application further facilitate the formation of the guide ribs 42, thereby forming the guide grooves 43 and reducing airflow noise.

[0105] Referring to Figure 9 , in some embodiments, the second connecting portion 41b includes a third plate segment 415 and a fourth plate segment 416, respectively disposed at the upper and lower ends of the volute member 41a. The third and fourth plate segments 415, 416 are located on opposite ends of the volute member 41a. The first plate segment 413 is connected to the third plate segment 415, and the fourth plate segment 416 is connected to the second plate segment 414. It can be understood that the third plate segment 415, the first plate segment 413, the second plate segment 414, and the fourth plate segment 416 are connected end-to-end. The third and fourth plate segments 415, 416 extend toward the support portion 45a and, together with the first and second plate segments 413, 414, define a connecting slot 45e that opens toward the support portion 45a. The third plate segment 415 is spaced apart from one end of the first plate segment 413, and the fourth plate segment 416 is spaced apart from one end of the second plate segment 414, forming the aforementioned opening.

[0106] The first connecting portion 45b can be configured to be elastic. When the first connecting portion 45b is located in the connecting groove 45e, the surface of the first connecting portion 45b elastically abuts against the inner wall surfaces of the third plate segment 415 and the fourth plate segment 416. The elastic action of the third plate segment 415, the fourth plate segment 416, and the first connecting portion 45b enables a tight fit between the first connecting portion 45b and the second connecting portion 41b, thereby relatively tightly connecting the second split structure 41 to the first split structure 45.

[0107] Continuing with Figure 9, in some specific embodiments, the support portion 45a includes a seventh plate segment 455 and an eighth plate segment 456 connected at an angle, while the first connecting portion 45b includes a fifth plate segment 453 and a sixth plate segment 454. The fifth plate segment 453 is connected to the seventh plate segment 455, and the sixth plate segment 454 is connected to the eighth plate segment 456. The fifth plate segment 453 and the sixth plate segment 454 are spaced apart and both extend toward the volute member 41a and extend into the connecting groove 45e. When the first connecting portion 45b is mated with the second connecting portion 41b, the fifth plate segment 453 abuts the inner surface of the third plate segment 415, and the sixth plate segment 454 abuts the inner surface of the fourth plate segment 416. It can be understood that the third plate segment 415, the fourth plate segment 416, the fifth plate segment 453, and the sixth plate segment 454 are all elastic. The fifth plate segment 453 and the sixth plate segment 454 tend to expand, respectively exerting an outward force on the third plate segment 415 and the fourth plate segment 416. After being subjected to the above-mentioned forces, the third plate segment 415 and the fourth plate segment 416 tend to maintain their original shape, thereby exerting an inward force on the fifth plate segment 453 and the sixth plate segment 454. The two forces are balanced and the third plate segment 415, the fourth plate segment 416, the fifth plate segment 453, and the sixth plate segment 454 are tightly fitted. The embodiment of the present application adopts the form of plate segments, which makes the first connecting portion 45b and the second connecting portion 41b more elastic, and the contact area between the plate segments is larger, making the connection more stable.

[0108] To further enhance connection stability, in some embodiments, the third plate segment 415 is further provided with a first buckle position 4151, the fourth plate segment 416 is provided with a second buckle position, the fifth plate segment 453 is provided with a first snap 4531, and the sixth plate segment 454 is provided with a second snap. To facilitate processing, the first buckle position 4151 and the second buckle position can be configured as grooves or through-slots, while the first snap 4531 and the second snap 4531 can be configured as hooks 3111. The first snap 4531 is coupled to the first buckle position 4151, and the second snap is coupled to the second buckle position. This can further enhance the constraint between the first connecting portion 45b and the second connecting portion 41b, thereby making the connection therebetween more stable and reliable.

[0109] It is understandable that the third plate segment 415 may be provided with a first buckle 4531 , the fourth plate segment 416 may be provided with a second buckle, the fifth plate segment 453 may be provided with a first buckle position 4151 , and the sixth plate segment 454 may be provided with a second buckle position. This application does not impose any restrictions on this.

[0110] Referring to Figure 9 , the distance between the third plate segment 415 and the fourth plate segment 416 gradually decreases as they approach the support portion 45a. As can be seen from the figure, the second connecting portion 41b formed by the third and fourth plate segments 415, 416 is tapered as it approaches the support portion 45a. Correspondingly, the first connecting portion 45b formed by the fifth and sixth plate segments 453, 454 is flared as it approaches the volute member 41a. The third plate segment 415 exerts a force on the fifth plate segment 453 toward the volute member 41a, while the fourth plate segment 416 exerts a force on the sixth plate segment 454 toward the volute member 41a. This forces the support portion 45a toward the volute member 41a, making it difficult for the first sub-structure 45 to separate from the second sub-structure 41, further enhancing the tightness of the connection between the first and second sub-structures 45, 41.

[0111] As shown in Figure 9, the volute tongue 41a and the support portion 45a are spaced apart, thereby defining a hollow cavity 16 between the volute tongue 41a and the support portion 45a. Both the volute tongue 41a and the support portion 45a are constructed from two plate sections, ensuring structural strength. The provision of the hollow cavity 16 significantly saves material and reduces costs. It is understood that if the inner wall of the hollow cavity 16 has some raised or recessed structures, such as those provided for mating with the shell body 51, then when the volute tongue structure is integrally formed and then demolded, the core (the portion filled in the hollow cavity 16) will have difficulty in being ejected along the length of the volute tongue 41a itself. In the present application, the first and second split structures 45 and 41 are separate components. When molded separately, they can be demolded perpendicular to the length of the volute tongue 41a itself, thereby facilitating a smoother production process.

[0112] In combination with the aforementioned embodiment, a guide rib 42 is provided on the first volute tongue guide surface 411 of the second split structure 41. At the same time, the first split structure 45 and the second split structure 41 also enclose a hollow cavity 16. Obviously, under this structural form, if the second split structure 41 and the first split structure 45 are integrally formed, due to the presence of the guide rib 42, the second split structure 41 and the first split structure 45 are difficult to remove along their own length direction. In the related art, there are attempts to demold from the radial direction (the direction perpendicular to the length direction of the volute tongue part 41a itself). However, in this way, in order to ensure the integrity of the volute tongue part 41a, the core of the hollow cavity 16 part still needs to be demolded along the length direction of the volute tongue part 41a itself. Combined with the aforementioned analysis, demolding the core here is also relatively difficult. Therefore, the present application divides the structure forming the volute tongue into two parts: the second split structure 41 and the first split structure 45, and the second split structure 41 and the first split structure 45 are molded separately. In this way, during the molding of the second split structure 41, it can be demolded by radially and / or longitudinally moving relative to the mold. The same applies to the first split structure 45, making production more convenient. After the second split structure 41 and the first split structure 45 are molded, they are then connected to form the hollow cavity 16. This not only allows for the realization of complex structural designs for the volute tongue 41a, but also improves production efficiency. The detachably connected second split structure 41 and first split structure 45 also allow for convenient replacement, improving structural adaptability.

[0113] Referring to Figures 7 to 9 , in this embodiment of the present application, the outer surface of the third plate segment 415 forms a second volute tongue guide surface 412, which smoothly connects to the first volute tongue guide surface 411. The seventh and eighth plate segments 455 and 456 of the support portion 45a, respectively, have a first surface 45a1 facing the diffuser chamber 12 and a second surface 45a3 facing the guide plate 52. Guided by the volute tongue member 41a, airflow sequentially passes through the first volute tongue guide surface 411, the second volute tongue guide surface 412, and the first surface 45a1. A portion of the airflow can also enter the air inlet chamber 11 through the return channel 31, where it flows through the second surface 45a3.

[0114] In one embodiment, the fifth plate segment 453 is positioned closer to the center of the hollow cavity 16 than the seventh plate segment 455. The fifth plate segment 453 and the seventh plate segment 455 cooperate to form a first step structure 45c that is lower than the first surface 45a1. The third plate segment 415 overlaps the first step structure 45c, so that the second volute tongue guide surface 412 is higher than or flush with the first surface 45a1. The sixth plate segment 454 also cooperates with the eighth plate segment 456 to form a second step structure 45d. The sixth plate segment 454 is closer to the center of the hollow cavity 16 than the eighth plate segment 456. The fourth plate segment 416 overlaps the second step structure 45d, so that the outer surface of the fourth plate segment 416 is flush with the second surface 45a3. For example, the second volute tongue guide surface 412 is flush with the first surface 45a1. This design eliminates unevenness at the joint, allowing airflow to flow more smoothly from the second volute tongue guide surface 412 to the first surface 45a1, reducing energy and pressure losses. In addition, it can effectively reduce the possibility of airflow leakage, avoid the airflow blowing the plate section to warp, and improve the structural stability.

[0115] In another embodiment, the fourth plate segment 416 is formed with a third step structure, and the sixth plate segment 454 overlaps the third step structure, so that the outer surface of the sixth plate segment 454 is higher than or flush with the outer surface of the fourth plate segment 416. Similarly, this helps to make the airflow flow through the return channel 31 smoother, reduce energy loss and pressure loss, reduce airflow leakage, and prevent the airflow from blowing the fourth plate segment 416 from warping, further improving structural stability.

[0116] The above is a specific embodiment of the air duct assembly 10. Based on this, the volute member 41a can be applied to the indoor unit and HVAC equipment proposed in this application. Since the indoor unit and HVAC equipment proposed in this application adopt all the technical solutions of all the above embodiments, they at least have all the effects brought by the technical solutions of the above embodiments, and will not be described in detail here.

[0117] Second embodiment

[0118] The indoor unit of a heating and ventilation system is equipped with a volute to guide the airflow generated by the impeller toward the outlet, where it is ultimately discharged indoors. Therefore, the structure of the volute has a significant impact on the noise reduction of the airflow generated by the impeller.

[0119] However, the existing volute tongue structure has a poor noise reduction effect on the airflow generated by the fan wheel, resulting in a large noise generated by the indoor unit, which affects the user experience.

[0120] To solve the above problems, please refer to Figure 10. One aspect of the present application proposes a HVAC device. In an embodiment of the present application, the HVAC device includes an indoor unit 1, an air-conditioning outdoor unit (not shown in the figure) and a connecting pipe (not shown in the figure). The indoor unit 1 is connected to the air-conditioning outdoor unit through the connecting pipe to realize the circulation of refrigerant between the indoor unit 1 and the air-conditioning indoor unit.

[0121] 10 to 12 , the indoor unit 1 includes an air duct assembly 10 , a fan 91 , a heat exchanger 92 , an electric control box 93 and a grille 98 .

[0122] The air duct assembly 10 may be generally rectangular in shape, having vertical, front-to-back, and left-to-right directions, with each of the vertical, front-to-back, and left-to-right directions being arranged at an angle. The air duct assembly 10 defines an air inlet chamber 11, a pressure diffuser chamber 12, and a heat exchange chamber 13, which are interconnected. Furthermore, the air duct assembly 10 defines an air intake 14 communicating with the air inlet chamber 11 and an air outlet 15 communicating with the heat exchange chamber 13.

[0123] The air inlet chamber 11 is configured to house the fan 91, the heat exchange chamber 13 is configured to house the heat exchanger 92, and the pressure diffuser 12 is used to diffuse the airflow from the air inlet chamber 11 to increase the airflow pressure and flow rate, thereby achieving better cooling or heating effects. In this way, external airflow can flow in through the air intake 14, and then flow through the fan 91 located in the air inlet chamber 11, the pressure diffuser 12, and the heat exchanger 92 located in the heat exchange chamber 13, before flowing out to the air outlet 15.

[0124] Referring to Figure 10 , in some embodiments, the indoor unit 1 can be a ducted unit, which can have an air duct inlet port 2a and an air duct outlet port 3a. The air duct inlet structure is defined between the rear side of the heat exchange chamber 13 and the rear side of the air inlet chamber 11. In other words, the air intake port 14 falls within the width of the air duct inlet port 2a. Thus, the air inlet duct connected to the ducted unit can be connected to the air duct inlet port 2a, and the air outlet duct connected to the ducted unit can be connected to the air duct outlet port 3a.

[0125] In some configurations, the air intake 14 can be positioned directly opposite the air inlet 11 and located below the air inlet 11. This allows the airflow to flow to the air inlet 11 via a shorter path after entering the air intake 14, reducing airflow losses during the flow process. The air outlet 15 can be positioned directly opposite the heat exchange chamber 13 and located in front of the heat exchange chamber 13. This allows the airflow to flow to the air outlet 15 via a shorter path after passing through the heat exchanger 92, similarly reducing airflow losses during the flow process.

[0126] Fan 91 can be in the shape of an elongated cylinder and can be a crossflow fan, a centrifugal fan, an axial flow fan, or the like. When fan 91 is configured as a crossflow fan, it offers advantages such as high air volume, uniform air delivery, and low noise. Compared to centrifugal fans, crossflow fans are also less expensive, though this application is not limited thereto. Fan 91 is housed within air inlet chamber 11 to draw in airflow from air inlet 14 and direct it toward diffuser chamber 12.

[0127] Heat exchanger 92 may be substantially V-shaped and housed within heat exchange chamber 13 and connected to the air conditioner outdoor unit via a connecting pipe, thereby enabling refrigerant circulation between indoor unit 1 and the air conditioner indoor unit. Heat exchanger 92 may be used to exchange heat between hot air and refrigerant, allowing the refrigerant to absorb heat, which is then transferred to the refrigerant to achieve a cooling effect.

[0128] The electrical control box 93 can be mounted on the surface of the air duct assembly 10 to achieve fixed installation. The electrical control box 93 can be electrically connected to the fan 91 and the heat exchanger 92 respectively to control or adjust the fan 91 and the heat exchanger 92. For example, when the temperature in the environment where the indoor unit 1 is operating reaches a set value, the electrical control box 93 can send a command to shut down the fan 91 and the heat exchanger 92, thereby reducing energy consumption and preventing the indoor temperature from being too low or too high.

[0129] 10 to 12 , the air duct assembly 10 includes a first shell 20 , a second shell 30 , a grille 98 and an outer shell (not shown).

[0130] The first housing 20 and the second housing 30 can be made of metal materials such as aluminum alloy, stainless steel, or iron to meet requirements such as high strength and corrosion resistance. Of course, they can also be made of plastic to meet requirements such as light weight. This application is not limited to this. For example, the first housing 20 can be made of metal and the second housing 30 can be made of plastic. It is understood that the first housing 20 and the second housing 30 are combined and connected to form the outline of the entire air duct assembly 10.

[0131] In some structural forms, the first shell 20 includes an upper shell and side panels 70, wherein the side panels 70 are connected between the upper shell and the first shell 20. Specifically, the upper shell and the second shell 30 can be arranged in a vertical direction with intervals, and the side panels 70 are connected between the upper shell and the second shell 30 to achieve a connection between the three.

[0132] The first housing 20 and the second housing 30 cooperate to define the air inlet chamber 11, the pressure diffuser chamber 12, and the heat exchange chamber 13. The air inlet 14 can be formed by enclosing the first housing 20 and the second housing 30, and the air outlet 15 can be opened on the first housing 20, which is not limited in this application.

[0133] Specifically, the first shell 20 and the second shell 30 can be fixedly connected by means of threaded connection, snap connection or welding, etc. For example, the first shell 20 and the second shell 30 can be fixedly connected by threaded connection. This connection method is structurally stable and has good repeated disassembly and assembly performance. This application does not impose any restrictions on this.

[0134] The first housing 20 may include an air inlet chamber rear shell 25, an air inlet chamber upper shell 21, a pressure diffuser chamber upper shell 22, and a heat exchange chamber upper shell 23, which are connected in sequence. The air inlet chamber rear shell 25, the air inlet chamber upper shell 21, and the second housing 30 cooperate to define the air inlet chamber 11, the pressure diffuser chamber upper shell 22 and the second housing 30 cooperate to define the pressure diffuser chamber 12, and the heat exchange chamber upper shell 23 and the second housing 30 cooperate to define the heat exchange chamber 13. Furthermore, the air inlet chamber rear shell 25, the air inlet chamber upper shell 21, the pressure diffuser chamber upper shell 22, and the heat exchange chamber upper shell 23 may be an integrated structure to improve the overall connection security of the first housing 20 and reduce the number of assembly steps for the first housing 20.

[0135] The second housing 30 may include a volute 41a, an air inlet chamber front housing 31, a pressure diffuser chamber lower housing 50, and a water receiving tray 60. Specifically, the air inlet chamber front housing 31, the air inlet chamber rear housing 25, and the air inlet chamber upper housing 21 cooperate to form the air inlet chamber 11, the pressure diffuser chamber lower housing 50 and the pressure diffuser chamber upper housing 22 cooperate to define the pressure diffuser chamber 12, and the heat exchange chamber upper housing 23 and the water receiving tray 60 cooperate to define the heat exchange chamber 13. The volute 41a is located at the junction of the air inlet chamber 11 and the pressure diffuser chamber 12 of the air duct assembly 10.

[0136] Please refer to Figures 12 to 13. Furthermore, the electrical control box 93 can be installed on the surface of the lower shell 50 of the diffuser chamber opposite to the lower shell guide surface 511, and is adjacent to the air suction port 14 and facing the air suction port 14. In this way, maintenance personnel can directly disassemble and assemble the electrical control box 93 at a position adjacent to the air suction port 14. Since there is no other structure blocking the area adjacent to the air suction port 14, it is more convenient for maintenance personnel to operate when disassembling and assembling the electrical control box 93.

[0137] The first shell 20 also includes an upper insulation sponge 24, which can be connected to the side of the upper shell of the heat exchanger 92 close to the heat exchanger 92, and the second shell 30 can also include a lower insulation sponge 80, which can be connected to the side of the water receiving tray 60 away from the heat exchanger 92. In this way, the upper insulation sponge 24 and the lower insulation sponge 80 can maintain the temperature in the air duct assembly 10 to a certain extent, reducing the probability of energy in the indoor unit 1 being dissipated outward through the first shell 20 and the second shell 30.

[0138] The grille 98 can be installed at the air intake 14 to block external debris, preventing external dust and debris from entering the air inlet chamber 11 and the heat exchange chamber 13 and affecting the fan 91 and the heat exchanger 92. In this way, the service life of the indoor unit 1 can be extended. In addition, when the air outlet 15 is located below the air inlet chamber 11, that is, the air outlet 15 is also located below the fan 91, the grille 98 can prevent users or maintenance personnel from touching the fan 91, reducing the risk of users or maintenance personnel accidentally touching the blades of the fan 91 and causing injury.

[0139] The outer shell can be made of metal materials such as aluminum alloy, stainless steel or iron to meet the requirements of high strength and corrosion resistance. The outer shell can be configured to cover the outside of the first shell 20 and the second shell 30, so that it can protect the first shell 20, the second shell 30 and the electric control box 93, and can also play a certain shielding role, such as shielding the electric control box 93 to prevent the user from directly observing the electric control box 93, which can improve the external aesthetics to a certain extent. Of course, in other structural forms, the first shell 20 and the second shell 30 can play the role of the outer shell. In this way, the first shell 20 and the second shell 30 can directly replace the outer shell, thereby reducing the number of structures of the air duct assembly 10 and reducing the volume of the air duct assembly 10, thereby miniaturizing the indoor unit 1 to adapt to more use environments with more compact installation space.

[0140] In order to reduce the noise generated by the airflow passing through the volute tongue during the use of the indoor unit 1, please refer to Figures 12 to 13. In some embodiments, the volute tongue member 41a can guide the airflow from the fan 91 into the diffuser chamber 12, that is, it is used to guide the airflow from the air intake chamber 11 to the diffuser chamber 12. The volute tongue member 41a includes a volute tongue body 41a1 and a guide rib 42.

[0141] The volute tongue body 41a1 is the main structure of the volute tongue member 41a and can be made of plastic and manufactured by injection molding. Of course, the volute tongue body 41a1 can also be made of metal, and this application does not impose any restrictions on this. The volute tongue body 41a1 has a first volute tongue guide surface 411. The first volute tongue guide surface 411 of the volute tongue body 41a1 is configured to form a first windward section 417 and a first wind-guiding section 418 adjacent to each other. Projected along the length of the air duct assembly 10, the contour line of the first windward section 417 is connected to the contour line of the air inlet chamber 10. The first wind-guiding section 418 has a first arc-shaped contour line 419. The bottom wall of the diffuser chamber 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 419 overlaps with the starting point of the first straight contour line 1211.

[0142] A plurality of guide ribs 42 are protruded on the main surface (411) of the volute tongue body 41a1 at intervals along the length direction of the air duct assembly 10, and each guide rib 42 is constructed into a second windward section 423 and a second wind guiding section 424. The second windward section 424 is arranged on the first windward section 417, and the second wind guiding section 424 is arranged on the first wind guiding section 418. 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.

[0143] In summary, the volute tongue member 41a of this embodiment has at least two effects:

[0144] First, since the airflow blown out by the fan 91 is relatively fast during operation, noise is easily generated. Based on this, the present application provides a plurality of guide ribs 42 protruding from the first volute tongue guide surface 411 at intervals, so that when the airflow blown out by the fan 91 flows through the volute tongue body 41a1 and is guided by the first volute tongue guide surface 411, part of the airflow flows between two adjacent guide ribs 42. In this way, the noisy airflow is separated, so that the energy of the noise can be weakened, reducing the impact of the noise on the user and reducing the generation of noise, thereby improving the user experience. In addition, the plurality of 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 plurality of guide ribs 42, the flow of the airflow in the length direction of the air duct assembly 10 can be reduced, that is, the flow of the airflow in the axial direction of the fan 91 can be reduced, thereby reducing the energy loss of the airflow in the process of flowing to the air outlet 15.

[0145] 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 this 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 this 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 member 41a.

[0146] Referring to FIG. 13 , in some embodiments, the first straight contour line 1211 is tangent to the first curved contour line 419. It is understood that when the wind flows through the first volute tongue guide surface 411, a portion thereof will flow toward the diffuser section 121 under the guidance of the first air guide section 418. If the first straight contour line 1211 is not tangent to the curved contour line of the first air guide section 418, a groove will exist at the junction of the first straight contour line 1211 and the first curved contour line 419. Therefore, based on the tangency of the first straight contour line 1211 and the first curved contour line 419, the wind flow guided by the first air guide section 418 can be ensured to flow smoothly toward the diffuser section 121, thereby further reducing the noise generated by the wind flow.

[0147] Please continue to refer to Figure 13. 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 419 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 419.

[0148] In this way, the wind flow 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 419, when the wind flow flows out of the second air guide section 424, it will continue to flow through the area of ​​the first arc contour line 419 of the first air guide section 418, 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 air flow 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 tongue member 41a.

[0149] Please refer to Figure 13. In some embodiments, the first windward section 417 and the first wind guiding section 418 are both arranged with arc contour lines, and the normal vector direction of the arc vertex of the first windward section 417 is away from the air inlet cavity 11, and the normal vector direction of the arc vertex of the first wind guiding section 418 is toward the air inlet cavity 11.

[0150] In this way, when the fan 91 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 418, and part will return to the air inlet chamber 11 under the guidance of the first windward section 417, so that this part of the wind flow can flow to the fan 91, so as to stabilize the eccentric vortex of the fan 91, thereby improving the air supply performance of the fan 91, and on the basis of the improvement of the air supply performance of the fan 91, the fan 91 can appropriately reduce its power when the required air supply volume is reached, thereby also reducing the noise generated by the fan 91 during operation.

[0151] Please continue to refer to Figure 13. 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 419 and the second arc-shaped contour line 425 are set correspondingly, the first arc-shaped contour line 419 corresponds to the second arc-shaped contour line 425, and the second straight contour line 1211 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 419.

[0152] 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, when the windflow flows out of the second air guide section 424, it will continue to flow through the first arc contour line 419 area of ​​the first air guide section 418, 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 tongue member 41a.

[0153] Referring to Figure 13 , in some embodiments, a concave cavity 46 is provided on the inner wall of the air inlet cavity 11. The concave cavity 46 is adjacent to and upstream of the first windward section 417. Thus, the concave cavity 46 can separate the inner wall of the air inlet cavity 11 from the first windward section 417, thereby reducing noise.

[0154] Please refer to Figures 13 to 15. In some embodiments, two adjacent guide ribs 42 and the first volute tongue guide 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.

[0155] Projected along the length of the air duct assembly 10, the first windward section 417 and the first air-guiding section 418 of the bottom of the guide groove 43 form a 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 point 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 91, guided by the guide groove 43, will flow to the first air-guiding section 418 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 volume flowing through the diffuser chamber 12, and ensuring the airflow volume. 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 member 41a.

[0156] Continuing to refer to Figures 13 to 15 , the diffuser section 121 is connected to the first air guide section 418, forming an intersection line at the connection point. The end point of the groove bottom profile 431 does not exceed the intersection line. Thus, under the guidance of the guide groove 43, the airflow blown out by the fan 91 does not immediately flow into the diffuser section. Instead, it flows into the first air guide section 418 before flowing into the diffuser section 121. This ensures that the guide ribs 42 do not occupy space in the diffuser chamber 12, thus preventing a reduction in the airflow volume flowing through the diffuser chamber 12 and ensuring sufficient airflow. Furthermore, the extended 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 41a.

[0157] Referring to Figures 15 and 16 , in some embodiments, the contour line 423 of the guide rib is configured to be wavy. When the guide rib contour line 423 is configured to be wavy, it can be divided into three sequentially connected segments: the first segment is an arc-shaped shape that is concave toward the tongue body 41a1, the second segment is an arc-shaped shape that is raised away from the tongue body 41a1, and the third segment is an arc-shaped shape that is concave toward the tongue body 41a1. It can be understood that the first segment is closer to the diffuser 121 than the third segment, and the curvature of the second segment is greater than that of the first segment. In this way, the first segment is smoother, thereby reducing wind resistance and airflow loss when the airflow flows through the guide rib 42, thereby enhancing air supply capacity.

[0158] In some embodiments, the contour line 423 of the guide rib is configured as a broken line. When the guide rib contour line 423 is configured as a broken line, it can be a two-section shape. The first section is connected to the bottom of the tongue body 41a1, extends away from the tongue body 41a1, and connects to the second section. The second section extends toward the tongue body 41a1 and intersects with the groove bottom contour line 431.

[0159] In some embodiments, the contour line 423 of the guide rib is configured as a single arc that rises away from the tongue body 41a1. When the contour line 423 of the guide rib is configured as a single arc that rises away from the tongue body 41a1, the airflow encounters less obstruction when flowing through the guide rib 42, thereby reducing wind resistance and airflow loss, thereby enhancing air supply capacity.

[0160] 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.

[0161] 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.

[0162] Referring to Figures 16 and 17 , 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 418. 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 418, resulting in smoother flow and less noise.

[0163] Alternatively, the connection between the end of the second windward section 423 extending toward the air inlet cavity 11 and the first windward section 417 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.

[0164] 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 418 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 417 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 418, 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.

[0165] Please refer to Figure 16. In some embodiments, the second shell 30 includes a first split structure 45 and a second split structure 41. The first split structure 45 and the second split structure 41 are detachably connected, and the first split structure 45 and the second split structure 41 cooperate to construct the bottom wall of the diffusion chamber 12, and cooperate to construct a portion of the inner wall of the air inlet chamber 11, wherein a portion of the second split structure 31 constructs the volute tongue member 41a.

[0166] It is understood that the first split structure 45 is provided with a water receiving tray 60, and cooperates with the second split structure 41 to form the diffuser chamber lower shell 50 and the air inlet chamber front shell 31. The second split structure 41 is provided with the volute member 41a. This allows for easy disassembly of the first split structure 45 or the second split structure 41 when maintenance is required.

[0167] Please continue to refer to Figure 16. Further, the first split structure 45 includes a shell body 51 and a support portion 45a. The shell body 51 and the second split structure 41 respectively cooperate to form the bottom wall of the diffusion chamber 12 and part of the inner wall of the air inlet chamber 11. The support portion 45a is connected to one side of the shell body 51 and is detachably connected to the second split structure 41. In this way, according to the different air output conditions of the specific fan 91, an appropriate volute 41a can be selected for matching. When replacement is required, it is only necessary to disassemble and assemble the second split structure 41 from the support portion 45a. Or when maintenance of the volute 41a is required, maintenance personnel can also disassemble and assemble the second split structure 41 from the support portion 45a. The specific detachable connection form can be a snap connection, a threaded connection, or an adhesive connection, etc., and this application does not limit this.

[0168] Furthermore, the shell body 51 and the support portion 45a can be an integral structure, which can improve the connection strength between the shell body 51 and the support portion 45a, reduce the number of assembly steps for the shell body 51 and the support portion 45a, 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.

[0169] Please refer to Figure 16. In some embodiments, the second split structure 41 includes a first plate segment 413, a third plate segment 415 and a fourth plate segment 416. The first plate segment 413 constitutes a volute tongue member 41a. The third plate segment 415 and the fourth plate segment 416 are connected to the opposite ends of the first plate segment 413. The third plate segment 415 cooperates with the shell body 51 of the first split structure 45 to constitute the bottom wall of the diffusion chamber 12. The fourth plate segment 416 cooperates with the shell body 51 of the first split structure 45 to constitute a portion of the inner wall of the air inlet chamber 11.

[0170] The support portion 52 is provided with a fifth plate segment 453 and a second connecting portion 522, the fifth plate segment 453 is arranged above the support portion 52, and the second connecting portion 522 is arranged below the support portion 52, wherein the third plate segment 415 is snap-connected with the fifth plate segment 453, and the fourth plate segment 416 is snap-connected with the second connecting portion 522.

[0171] The first plate segment 413, the third plate segment 415, and the fourth plate segment 416 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.

[0172] Specifically, the fifth plate segment 453 can be a first buckle, and a buckle hole for the first buckle to be snapped into is provided on the third plate segment 415, thereby realizing a buckle connection between the third plate segment 415 and the fifth plate segment 453; 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 be guided and cooperated with the side wall of the buckle hole to facilitate assembly.

[0173] The sixth plate segment 454 can be a second snap fastener, and the fourth plate segment 416 is provided with a third snap fastener. The second snap fasteners enclose a snap-fitting space, allowing the third snap fastener to snap into place within the snap-fitting space when it is attached to the second snap fastener. Thus, by providing at least two snap-fitting connections between the support portion 52 and the second split structure 41 in the vertical direction, the connection between the support portion 52 and the second split structure 41 is more stable, and assembly and disassembly are more convenient and quicker.

[0174] Referring to FIG. 13 , the support portion 52 is further recessed in a direction away from the second split structure 41 to form a lap step. The fifth plate segment 453 is disposed on the lap step, and the third plate segment 415 can overlap the lap step and be snap-fitted to the fifth plate segment 453. This allows the third plate segment 415 to be closer to the diffuser upper shell 22 than the lap step, preventing airflow from the fan 91 from flowing toward the lap step. This prevents the support portion 52 from tilting toward the diffuser upper shell 22 under prolonged use. This would obstruct the airflow from the tilted support portion 52 and waste airflow energy. The lap step in this embodiment ensures that the junction of the third plate segment 415 and the lap step faces away from the airflow direction. This prevents the third plate segment 415 from tilting even under prolonged use, thus reducing the potential for airflow energy loss.

[0175] Continuing with FIG13 , in some embodiments, the second split structure and the support portion 52 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 41 and the second half cavity enclosed by the outer wall of the support portion 52, thereby enclosing and forming the hollow cavity 16. Of course, the hollow cavity 16 can also be enclosed by the inner wall of the second split structure 41 alone, or by the outer wall of the support portion 52, which is not limited in this application. Thus, compared to a non-hollow arrangement between the second split structure 41 and the support portion 52, this embodiment can reduce the material of the volute body 41a1 and the support portion 52, reducing the cost of the second housing 30 and reducing the weight of the second housing 30, thereby reducing the overall weight of the indoor unit 1.

[0176] 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.

[0177] 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, wherein, It has an air inlet chamber and a pressure diffuser chamber that are connected to each other. A volute tongue piece is provided at the junction of the air inlet chamber and the pressure diffuser chamber. The air inlet chamber is configured to accommodate a fan, and the fan drives external airflow into the air inlet chamber. The volute tongue piece includes a volute tongue body, and the volute tongue body faces the fan to guide the airflow into the pressure diffuser chamber. The cross-sectional area of the pressure diffuser chamber along the airflow direction gradually increases.

2. The air duct assembly according to claim 1, wherein, The worm tongue includes: A first split structure, comprising a supporting portion and a first connecting portion connected to each other, wherein the first connecting portion is disposed on a side of the supporting portion facing the fan; and The second split structure is formed separately from the first split structure, and includes a connected volute tongue body and a second connecting portion, wherein the second connecting portion is arranged on a side of the volute tongue body away from the fan and is detachably connected to the first connecting portion.

3. The air duct assembly according to claim 2, wherein, The support portion is spaced apart from the volute tongue body, and the support portion, the volute tongue body, the first connecting portion and the second connecting portion are configured to form a hollow cavity.

4. The air duct assembly according to claim 2, wherein, The volute tongue main body also includes a plurality of guide ribs. The volute tongue main body has a first volute tongue guide surface and is extended along the axial direction of the fan. The plurality of guide ribs are protruded on the first volute tongue guide surface at intervals along the extension direction of the volute tongue main body. Two adjacent guide ribs and the first volute tongue guide surface define a guide groove.

5. The air duct assembly according to claim 4, wherein, The volute tongue body comprises a first plate segment and a second plate segment connected to each other, the first plate segment and the second plate segment cooperate to define the first volute tongue flow guide surface, the first plate segment is configured to extend toward the first split structure, the second plate segment is configured to face the fan, and the extension direction of the first plate segment and the extension direction of the second plate segment are arranged at an angle; The guide rib includes a first rib segment and a second rib segment connected to each other. The first rib segment is arranged on the first plate segment, and a terminal end of the first volute tongue guide surface is connected to the first volute tongue guide surface. The second rib segment is arranged on the second plate segment.

6. The air duct assembly according to claim 4, wherein, The second connecting portion includes a third plate segment and a fourth plate segment respectively arranged at the upper and lower ends of the volute tongue main body, the third plate segment and the fourth plate segment are both extended toward the supporting portion, the third plate segment, the fourth plate segment and the volute tongue main body form a connecting groove, the first connecting portion is located in the connecting groove, and elastically abuts against the inner wall surfaces of the third plate segment and the fourth plate segment.

7. The air duct assembly according to claim 6, wherein, In a direction approaching the supporting portion, a distance between the third plate segment and the fourth plate segment gradually decreases.

8. The air duct assembly according to claim 6, wherein, The first connecting portion includes a fifth plate segment and a sixth plate segment provided at upper and lower ends of the supporting portion, and the fifth plate segment and the sixth plate segment are both extended toward the volute tongue body; The fifth plate segment abuts against the inner surface of the third plate segment, and the sixth plate segment abuts against the inner surface of the fourth plate segment.

9. The air duct assembly according to claim 8, wherein, The third plate segment is provided with a first buckle position, the fourth plate segment is provided with a second buckle position, the fifth plate segment is provided with a first buckle, and the sixth plate segment is provided with a second buckle, the first buckle is matched and connected with the first buckle position, and the second buckle is matched and connected with the second buckle position; And / or, the volute tongue body is spaced from the support portion to define a hollow cavity between the volute tongue body and the support portion.

10. The air duct assembly according to any one of claims 1 to 9, wherein, The volute tongue body has a first volute tongue guiding surface. The second connecting portion includes a third plate segment connected to one end of the volute tongue body. The third plate segment extends toward the support portion, and an outer surface of the third plate segment forms a second volute tongue guiding surface, and the second volute tongue guiding surface is smoothly connected to the first volute tongue guiding surface. The support portion has a first surface. The first connecting portion and the support portion cooperate to form a first stepped structure lower than the first surface. The third plate segment overlaps the first stepped structure so that the second volute tongue guiding surface is higher than the first surface or flush with the first surface.

11. The air duct assembly according to claim 10, wherein, The second connecting portion further includes a fourth plate segment connected to the end of the volute tongue body away from the third plate segment. The fourth plate segment extends toward the support portion. The support portion further has a second surface disposed at an angle to the first surface. The first connecting portion and the support portion further cooperate to form a second stepped structure. The fourth plate segment overlaps the second stepped structure so that an outer surface of the fourth plate segment is flush with the second surface.

12. The air duct assembly according to claim 10, wherein, The second connecting portion further includes a fourth plate segment connected to the end of the volute tongue body away from the third plate segment. The fourth plate segment extends toward the support portion, and the fourth plate segment forms a third stepped structure. The support portion further has a second surface disposed at an angle to the first surface. The first connecting portion further includes a sixth plate segment connected to one end of the support portion. The sixth plate segment extends toward the volute tongue body, and an outer surface of the sixth plate segment is smoothly connected to the second surface. The sixth plate segment overlaps the third stepped structure so that the outer surface of the sixth plate segment is higher than the outer surface of the fourth plate segment or flush with the outer surface of the fourth plate segment.

13. The air duct assembly according to any one of claims 1 to 12, wherein, It includes a first housing and a second housing. The second housing includes a front air inlet housing, a diffuser chamber lower housing, and a water receiving tray. Opposite sides of the diffuser chamber lower housing are respectively connected to the water receiving tray and the front air inlet housing. The first housing cooperates with at least the front air inlet housing to define the air inlet chamber, and cooperates with at least the diffuser chamber lower housing to define the diffuser chamber, and cooperates with the water receiving tray to define a heat exchange chamber. The air inlet chamber, the diffuser chamber, and the heat exchange chamber are connected in sequence. Wherein, the first split structure is disposed on a side of the diffuser chamber lower housing away from the water receiving tray and above the front air inlet housing.

14. The air duct assembly according to claim 13, wherein, The diffuser chamber lower housing includes a housing body. Opposite sides of the housing body are connected to the water receiving tray and the front air inlet housing, and a side of the housing body away from the water receiving tray is connected to the first split structure. Wherein, the first split structure and the housing body are an integral structure.

15. The air duct assembly according to claim 1, wherein, The volute tongue member includes: The volute tongue body is configured to guide the air flow in the air inlet cavity to the diffuser cavity. The volute tongue body has a first volute tongue guide surface, which is configured as a first windward section and a first air guide section adjacent to each other in sequence. When projected along the length direction of the air duct assembly, the contour line of the first windward section is connected to the profile line of the air inlet cavity. The first air guide section has a first arc contour line. The bottom wall of the diffuser cavity is configured as a diffuser section, and the profile line of the diffuser section is set as a straight line and has a first straight contour line. The first arc contour line overlaps with the starting point of the first straight contour line; and A plurality of guide ribs are convexly provided on the first volute tongue guide surface at intervals along the length direction of the air duct assembly. Each guide rib is configured as a second windward section and a second air guide section. The second windward section is provided on the first windward section, and the second air guide section is provided on the first air guide section. When projected along the length direction of the air duct assembly, the end point of the contour line of the second air guide section does not exceed the starting point of the first straight contour line.

16. The air duct assembly according to claim 15, wherein, The first straight contour line is tangent to the first arc contour line.

17. The air duct assembly according to claim 16, wherein, The second air guide section has a second arc contour line and a second straight contour line. The first arc contour line and the second arc contour line are correspondingly arranged. The second straight contour line extends from the end point of the second arc contour line and ends at the end point of the first arc contour line.

18. The air duct assembly according to claim 15, wherein, Both the first windward section and the first air guide section are provided with arc contour lines. The normal vector direction of the arc vertex of the first windward section is away from the air inlet cavity, and the normal vector direction of the arc vertex of the first air guide section is towards the air inlet cavity.

19. The air duct assembly according to claim 18, wherein, The second windward section is provided with an arc contour line. The second air guide section has a second arc contour line and a second straight contour line. The first arc contour line and the second arc contour line are correspondingly arranged. The first arc contour line corresponds to the second arc contour line. The second straight contour line starts from the end point of the second arc contour line and ends at the end point of the first arc contour line.

20. The air duct assembly according to claim 15, wherein, A concave cavity is provided on the inner wall of the air inlet cavity. The concave cavity is adjacent to the first windward section and is located upstream of the first windward section.

21. The air duct assembly according to claim 15, wherein, Adjacent two of the guide ribs and the first volute tongue guide surface jointly define a guide groove; Wherein, when projected along the length direction of the air duct assembly, the part of the first windward section and the first air guide section at the bottom of the guide groove constitutes a bottom profile line, and the end point of the contour line of the second air guide section intersects with the bottom profile line.

22. The air duct assembly according to claim 21, wherein, The diffuser section is connected to the first air guide section and forms an intersection line at the connection; Wherein, the end point of the bottom profile line does not exceed the intersection line.

23. The air duct assembly according to claim 15, wherein, The shape of the contour line of the guide rib is configured as a wavy shape, a broken line shape or a single arc shape bulging away from the volute tongue body.

24. The air duct assembly according to claim 15, wherein, A plurality of the guide ribs are all located on one side of the diffuser section.

25. The air duct assembly according to any one of claims 15 to 24, wherein, The connection between the end of the second air guide section extending towards the diffuser section and the first air guide section is in a smooth transition; and / or, The connection between the end of the second windward section extending towards the air inlet cavity and the first windward section is in a smooth transition.

26. An indoor unit, wherein, It includes a blower and an air duct assembly as described in any one of claims 1 to 25, and the blower is received in the air inlet chamber.

27. A heating, ventilation and air conditioning device, wherein, It includes an outdoor unit and an indoor unit as described in claim 26, and the outdoor unit and the indoor unit form a refrigerant cycle.

28. The HVAC equipment according to claim 27, wherein, The air duct assembly is further provided with an air return opening communicating with the air inlet chamber and an air outlet communicating with the heat exchange chamber. The indoor unit is further provided with: An air duct air inlet part, which is connected to the bottom of the air duct assembly and has an air duct air inlet interface. The air duct air inlet interface communicates with the air return opening, and at least part of the outer wall surface of the diffuser chamber is exposed at the air duct air inlet interface; And An air duct air outlet part, which is connected to one side of the air duct assembly and has an air duct air outlet interface. The air duct air outlet interface communicates with the air outlet.

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