Air duct assembly and duct type air conditioner

Abstract

The invention discloses an air duct assembly and a duct type air conditioner. The air duct assembly is provided with a fan cavity and a diffusion cavity which communicate with each other, the fan cavity is used for arranging a fan, and a first split structure and a second split structure are arranged at the joint of the fan cavity and the diffusion cavity. The first split structure comprises a supporting part and a first connecting part which are connected, and the first connecting part is arranged on the side, facing the draught fan, of the supporting part. The second split structure and the first split structure are formed in a split mode, the second split structure comprises a volute tongue and a second connecting part which are connected, the volute tongue faces the fan, and the second connecting part is arranged between the volute tongue and the supporting part and detachably connected with the first connecting part. According to the technical scheme, the volute tongue structure of a more complex structure can be machined easily, efficiency is higher, mold design is simple, cost is reduced, and structural applicability and convenience of disassembly, assembly and maintenance can be improved.

Description

Technical Field

[0001] This application relates to the field of heating, ventilation, and air conditioning (HVAC) technology, and particularly to an air duct assembly and an air duct machine. Background Art

[0002] HVAC equipment often includes air duct machines. Air duct machines have advantages such as low cost and easy maintenance.

[0003] At the air outlet position of the fan in the air duct machine, a volute tongue is generally provided to guide the air flow. The volute tongue is mostly integrally installed on the housing of the air duct machine. Currently, an integral volute tongue is mostly used to connect with the housing. However, the integral volute tongue brings difficulties to the production of the volute tongue and cannot effectively improve production efficiency. Summary of the Invention

[0004] Embodiments of this application provide an air duct assembly and an air duct machine, which can facilitate processing and improve production efficiency.

[0005] In a first aspect, an embodiment of this application provides an air duct assembly having a fan chamber and a diffuser chamber that are connected and communicate with each other. The fan chamber is used to set a fan, and at the transition between the fan chamber and the diffuser chamber, there are provided:

[0006] A first split structure, including a support part and a first connection part that are connected. The first connection part is provided on the side of the support part facing the fan; and

[0007] A second split structure, which is formed by split molding with the first split structure, includes a volute tongue and a second connection part that are connected. The volute tongue faces the fan. The second connection part is provided between the volute tongue and the support part and is detachably connected to the first connection part.

[0008] In an embodiment, the support part and the volute tongue are arranged at intervals, and the support part, the volute tongue, the first connection part, and the second connection part are configured to form a hollow cavity.

[0009] In an embodiment, the air duct assembly further includes a plurality of flow guiding ribs. The volute tongue has a first volute tongue flow guiding surface and extends along the axial direction of the fan. The plurality of flow guiding ribs are convexly provided on the first volute tongue flow guiding surface at intervals along the extending direction of the volute tongue. Adjacent two flow guiding ribs and the first volute tongue flow guiding surface define a flow guiding groove.

[0010] In an embodiment, the volute tongue includes a first plate segment and a second plate segment that are connected. The first plate segment and the second plate segment cooperate to define the first volute tongue flow guiding surface. The first plate segment is configured to extend towards the first split structure, and the second plate segment is configured to face the fan. The extending direction of the first plate segment and the extending direction of the second plate segment are arranged at an angle;

[0011] The diversion rib includes a first rib segment and a second rib segment connected to each other. The first rib segment is disposed on the first plate segment and its end is connected to the first volute tongue diversion surface, and the second rib segment is disposed on the second plate segment.

[0012] In one embodiment, the second connecting portion includes a third plate segment and a fourth plate segment respectively disposed at the upper and lower ends of the volute tongue. Both the third plate segment and the fourth plate segment extend towards the support portion. The third plate segment, the fourth plate segment and the volute tongue define 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.

[0013] In one embodiment, in the direction close to the support portion, the distance between the third plate segment and the fourth plate segment gradually decreases.

[0014] In one embodiment, the first connecting portion includes a fifth plate segment and a sixth plate segment respectively disposed at the upper and lower ends of the support portion. Both the fifth plate segment and the sixth plate segment extend towards the volute tongue;

[0015] Wherein, 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.

[0016] In one embodiment, the third plate segment is provided with a first fastening position, the fourth plate segment is provided with a second fastening 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 connected in cooperation with the first fastening position, and the second buckle is connected in cooperation with the second fastening position;

[0017] And / or, the volute tongue and the support portion are spaced apart to define a hollow cavity between the volute tongue and the support portion.

[0018] In one embodiment, the volute tongue has a first volute tongue diversion surface. The second connecting portion includes a third plate segment connected to one end of the volute tongue. The third plate segment extends towards the support portion, and the outer surface of the third plate segment forms a second volute tongue diversion surface, and the second volute tongue diversion surface is smoothly connected to the first volute tongue diversion surface;

[0019] 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 on the first stepped structure so that the second volute tongue diversion surface is higher than the first surface or flush with the first surface.

[0020] In one embodiment, the second connecting portion further includes a fourth plate segment connected to the end of the volute tongue away from the third plate segment. The fourth plate segment extends towards the support portion;

[0021] 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 step structure, and the fourth plate segment is lapped on the second step structure so that the outer surface of the fourth plate segment is flush with the second surface.

[0022] In one embodiment, the second connecting portion further includes a fourth plate segment connected to an end of the volute tongue away from the third plate segment. The fourth plate segment extends toward the support portion, and the fourth plate segment forms a third step structure.

[0023] 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, and the outer surface of the sixth plate segment is smoothly connected to the second surface. The sixth plate segment is lapped 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.

[0024] In one embodiment, it includes a first housing and a second housing. The second housing includes a front housing of the fan chamber, a lower housing of the diffuser chamber, and a water receiving tray. Opposite sides of the lower housing of the diffuser chamber are respectively connected to the water receiving tray and the front housing of the fan chamber.

[0025] The first housing cooperates with at least the front housing of the fan chamber to define the fan chamber, and cooperates with at least the lower housing of the diffuser chamber to define the diffuser chamber, and cooperates with the water receiving tray to define a heat exchange chamber. The fan chamber, the diffuser chamber, and the heat exchange chamber are communicated in sequence.

[0026] Wherein, the first split structure is disposed on a side of the lower housing of the diffuser chamber away from the water receiving tray and above the front housing of the fan chamber.

[0027] In one embodiment, the lower housing of the diffuser chamber includes a housing body. Opposite sides of the housing body are connected to the water receiving tray and the front housing of the fan chamber, and a side of the housing body away from the water receiving tray is connected to the first split structure.

[0028] Wherein, the first split structure and the housing body are an integral structure.

[0029] In a second aspect, an embodiment of the present application provides an air duct machine, including an outdoor unit and an indoor unit. The indoor unit includes a fan, a heat exchanger, and the air duct assembly according to any one of the above. The air duct assembly further has a heat exchange chamber communicated with the diffuser chamber. The fan is disposed in the fan chamber, and the heat exchanger is disposed in the heat exchange chamber.

[0030] In one embodiment, the air duct assembly is further provided with a return air inlet communicating with the blower chamber and an air outlet communicating with the heat exchange chamber. The indoor unit is further provided with:

[0031] An air duct air inlet part, connected to the bottom of the air duct assembly and having an air duct air inlet interface, the air duct air inlet interface communicating with the return air inlet, and at least part of the outer wall surface of the diffuser chamber being exposed at the air duct air inlet interface; and

[0032] An air duct air outlet part, connected to one side of the air duct assembly and having an air duct air outlet interface, the air duct air outlet interface communicating with the air outlet.

[0033] In the embodiment of the present application, by setting the structure at the volute tongue as two parts of a detachable connection, namely a first split structure and a second split structure, the first split structure and the second split structure can be injection molded separately, and the volute tongue is formed by part of the second split structure. In this way, the first split structure and the second split structure can be demolded separately. In the actual production process, demolding and reassembling the first split structure and the second split structure separately is beneficial for processing a more complex volute tongue. Compared with demolding an integrally formed volute tongue, the demolding efficiency of the embodiment of the present application is higher. Relatively speaking, the mold design for the first split structure and the second split structure separately is also relatively simple, reducing costs. Moreover, different second split structures can be selected for matching according to the specific actual use situation. When replacement is needed, only the second split structure needs to be disassembled and assembled from the first split structure, making the structure more flexible and improving the structural applicability; or when maintenance of the volute tongue is required, the maintenance personnel can also disassemble and assemble the second split structure from the first split structure, improving the convenience of disassembly and maintenance. Description of the Drawings

[0034] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the following drawings are only some embodiments of the present application. For those of ordinary skill in the art, other drawings can be obtained based on the structures shown in these drawings without creative efforts.

[0035] Figure 1 It is a schematic structural diagram of an embodiment of the indoor unit of the present application;

[0036] Figure 2 For Figure 1 the exploded structural diagram of the indoor unit in

[0037] Figure 3 For Figure 1 the front view schematic diagram of the indoor unit in

[0038] Figure 4 Schematic top view of the internal structure of an embodiment of the indoor unit of the present application;

[0039] Figure 5 is Figure 1 Explosion structure schematic diagram of another embodiment of the indoor unit in;

[0040] Figure 6 is Figure 3 Schematic cross-sectional structure diagram of the indoor unit at section A-A in;

[0041] Figure 7 Exploded structure schematic diagram of a part of the volute tongue of an embodiment of the present application;

[0042] Figure 8 Schematic structure diagram of the second housing of the present application;

[0043] Figure 9 is Figure 6 Enlarged structure schematic diagram at C in.

[0044] Explanation of the reference numerals in the drawings:

[0045] 1, air duct machine; 10, air duct assembly; 11, fan chamber; 12, diffuser chamber; 13, heat exchange chamber; 14, air return opening; 15, air outlet; 16, hollow cavity; 20, first housing; 20a, cover body; 21, upper shell of the fan chamber; 22, upper shell of the diffuser chamber; 23, upper shell of the heat exchange chamber; 24, rear shell of the fan chamber; 30, second housing; 31, front shell of the fan chamber; 41, second split structure; 41a, volute tongue; 41b, second connecting portion; 411, first volute tongue guiding surface; 412, second volute tongue guiding surface; 413, first plate segment; 414, second plate segment; 415, third plate segment; 4151, first buckling position; 416, fourth plate segment; 42, guide rib; 421, first rib segment; 422, second rib segment; 43, guide groove; 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; 50, lower shell of the diffuser chamber; 51, shell body; 60, water receiving tray; 70, side enclosure; 91, fan; 91a, air inlet side; 91b, air outlet side; 911, impeller; 913, motor; 92, heat exchanger; 921, refrigerant pipe; 93, electric control box; 98, grille; 981, first grille; 983, second grille. 2, air duct air inlet part; 2a, air duct air inlet interface; 3, air duct air outlet part; 3a, air duct air outlet interface.

[0046] The realization, functional features and advantages of the present application will be further described with reference to the embodiments and the accompanying drawings. Detailed Embodiments

[0047] To make the objectives, technical solutions and advantages of the present application clearer, the following will further describe the embodiments of the present application in detail with reference to the accompanying drawings.

[0048] 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. On the contrary, they are merely examples of devices and methods that are consistent with some aspects of the present application as detailed in the appended claims.

[0049] In the description of the present application, it should be understood that terms such as "first", "second", etc. are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. For those of ordinary skill in the art, the specific meanings of the above terms in the present application can be understood according to specific circumstances. In addition, in the description of the present application, unless otherwise specified, "a plurality" means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist simultaneously, and B exists alone. The character " / " generally represents an "or" relationship between the associated objects before and after.

[0050] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those of ordinary skill in the technical field to which this application belongs. The terms used in the description of this specification are only for the purpose of describing specific embodiments and are not intended to limit the present application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0051] Please refer to Figure 1 and Figure 2 , an air duct machine 1 is proposed in an embodiment of the present application, which can also be called an air-conditioning air duct machine or an air duct machine air conditioner. The air duct machine 1 includes an indoor unit and an outdoor unit. The indoor unit and the outdoor unit are connected by cables, pipelines, etc. to jointly operate to regulate the indoor environment. It can be understood that the indoor unit is arranged indoors and is usually installed in a ceiling-mounted form for supplying air to the indoor. The indoor unit includes an air duct assembly 10, a fan 91, a heat exchanger 92 and an electric control box 93.

[0052] Among them, the air duct assembly 10 is used to construct the air duct of the indoor unit applicable to the air duct machine 1 for gas flow. Specifically, the air duct assembly 10 is a structure mainly composed of a housing, and its outer contour can be generally rectangular parallelepiped-shaped, having 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 pairwise arranged at an angle. Please refer to Figures 3 to 6 , a blower cavity 11, a diffuser cavity 12, and a heat exchange cavity 13 are sequentially formed and communicated in the air duct assembly 10, and an air return port 14 communicating with the blower cavity 11 and an air outlet 15 communicating with the heat exchange cavity 13 are formed, so that gas can enter the air duct assembly 10 from the air return port 14, and sequentially pass through the blower cavity 11, the diffuser cavity 12, and the heat exchange cavity 13, and finally flow out from the air outlet 15.

[0053] The blower 91 is arranged in the blower cavity 11, and can extract the gas from the air return port 14 and do work on it to make it flow to the diffuser cavity 12 at a faster flow rate, providing power for the gas circulation of the above air duct. The blower 91 can be a cross-flow blower, a centrifugal blower, an axial-flow blower, etc. As Figure 4 shown, taking the cross-flow blower as an example, the blower 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 connected to the side enclosure 70, and the output shaft of the motor 913 is connected to the impeller 911. One side in the circumferential direction of the impeller 911 is generally oriented towards the air inlet 14, and this side of the impeller 911 is defined as the air inlet side 91a; the other side in the circumferential direction of the impeller 911 spaced from the air inlet side 91a is generally oriented towards the diffuser cavity 12, and this side of the impeller 911 is defined as the air outlet side 91b. A plurality of blades are distributed along the circumferential direction of the impeller 911. When the motor 913 drives the impeller 911 to rotate, the rotating blades can promote the gas to flow from the air inlet side 91a to the air outlet side 91b. The cross-flow blower has the advantages of energy saving, large air volume, low noise, and simple installation.

[0054] Combined with Figure 5 and Figure 6 , the heat exchanger 92 is housed in the heat exchange cavity 13 and is used to exchange heat with the gas flowing through the heat exchange cavity 13 and passing through the heat exchanger 92, playing a role in cooling or heating the gas. For example, a plurality of refrigerant pipes 921 are arranged in the heat exchanger 92, and the gas exchanges heat with the refrigerant in the pipe when passing through the heat exchanger 92, so that the temperature is reduced to form low-temperature air. To increase the heat exchange area of the heat exchanger 92, the heat exchanger 92 can be arranged in a shape, an arc shape, or a wavy shape, and is composed of a single heat exchange fin or a combination of multiple heat exchange fins.

[0055] An electronic control box 93 is provided inside with an electronic control board assembly, on which a variety of electronic components are integrated, used for electrically connecting devices such as a blower 91, and for overall control of the overall operating conditions of the indoor unit. Inevitably, the electronic components generate a relatively large amount of heat during operation. In the embodiments of the present application, the electronic control box 93 can be arranged in the air duct formed by the air duct assembly 10 or close to the air duct, so as to dissipate heat from the electronic control box 93 to a certain extent through the air duct, avoid device operation failures or damages caused by overheating of the electronic control board assembly, improve the operating stability of the indoor unit, and extend the service life.

[0056] Optionally, the air return opening 14 is arranged to open downward, and the air outlet 15 is arranged to open forward. The indoor unit also has an air duct air inlet part 2 and an air duct air outlet part 3. Among them, the air duct air inlet part 2 is connected to the bottom of the air duct assembly 10, and the air duct air outlet part 3 is connected to the front side of the air duct assembly 10. The air duct air inlet part 2 can be composed of a surrounding plate extending downward from the air duct assembly 10 to facilitate sleeving the air inlet duct. The air duct air inlet part 2 has an air duct air inlet interface 2a, and the air duct air inlet interface 2a communicates with the air return opening 14 so that the air flow in the air inlet duct can enter the blower cavity 11 through the air duct air inlet interface 2a and the air return opening 14. At least part of the outer wall surface of the diffuser cavity 12 is exposed at the air duct air inlet interface 2a, and the electronic control box 93 can be arranged on the outer wall surface of the diffuser cavity 12 exposed at the air duct air inlet interface 2a. In this way, the electronic control box 93 can be overhauled after removing the air inlet duct at the air duct air inlet interface 2a, which is convenient and fast. Similarly, the air duct air outlet part 3 is composed of a surrounding plate extending forward from the air duct assembly 10 to facilitate sleeving the air outlet duct. The air duct air outlet part 3 has an air duct air outlet interface 3a, and the air duct air outlet interface 3a communicates with the air outlet 15 so that the air flow in the heat exchange cavity 13 can enter the air outlet duct through the air outlet 15 and the air duct air outlet interface 3a.

[0057] Please refer to Figure 5 , in some embodiments of the present application, for the convenience of assembling the indoor unit, the air duct assembly 10 includes a connected first housing 20 and a second housing 30. Among them, the first housing 20 and the second housing 30 can be made of metal materials such as aluminum alloy or stainless steel respectively to meet requirements such as high strength and corrosion resistance; or, the first housing 20 and the second housing 30 can also be made of plastic materials to achieve the light weight of the air duct assembly 10, and the present application does not limit this. For example, the air duct assembly 10 can adopt a combination of the first housing 20 being made of metal material and the second housing 30 being made of plastic material. In addition, the embodiments of the present application do not limit the connection method between the first housing 20 and the second housing 30, and they can be connected separately or in combination by means of snap connection, riveting, welding, bolt connection, etc.

[0058] Please combine Figure 2 and Figure 5, the first housing 20 includes a cover body 20a and two side enclosures 70. The two side enclosures 70 are spaced apart in the left-right direction XX. The cover body 20a is generally disposed above the two side enclosures 70, and both sides of the cover body 20a in the left-right direction XX are respectively connected to the two side enclosures 70. Along the front-back direction YY from the rear to the front, the cover body 20a includes a blower cavity rear shell 24, a blower cavity upper shell 21, a diffuser cavity upper shell 22, and a heat exchange cavity upper shell 23 that are sequentially connected. The second housing 30 is spaced apart from the cover body 20a in the up-down direction ZZ, and includes a blower cavity front shell 31, a diffuser cavity lower shell 50, and a water receiving tray 60 that are connected. The blower cavity rear shell 24 is spaced apart from the blower cavity front shell 31 in the front-back direction YY, and the blower cavity rear shell 24, the blower cavity upper shell 21, the blower cavity front shell 31, and the side enclosures 70 define a blower cavity 11. The diffuser cavity upper shell 22 at least defines a diffuser cavity 12 with the diffuser cavity lower shell 50 and the side enclosures 70, and the heat exchange cavity upper shell 23 defines a heat exchange cavity 13 with the water receiving tray 60 and the side enclosures 70.

[0059] Please refer to Figure 5 and Figure 6 , the blower 91 is disposed in the blower cavity 11 and extends along the left-right direction XX. The air inlet side 91a of the blower 91 faces the inlet of the blower cavity 11, and the inlet of the blower cavity 11 communicates with the return air outlet 14, so that the blower 91 can draw the air near the return air outlet 14 through the return air outlet 14. In one embodiment, the blower 91 is a cross-flow blower 91. The air outlet side 91b of the impeller 911 (the blower 91) communicates with the diffuser cavity 12. The gas radially passes through the impeller 911 from the air inlet side 91a and enters the inside of the impeller 911, and then radially flows out from the air outlet side 91b of the impeller 911 to the diffuser cavity 12. In this process, the gas forms an air flow vortex (eccentric vortex) with the center near the volute tongue 40. The volute tongue 40 is disposed on the air outlet side 91b of the impeller 911, which is used to divide the air flow on the air outlet side 91b and also plays a role in stabilizing the eccentric vortex, which can reduce the circulating flow of the gas, increase the cross-flow area, and thus can increase the flow rate and head of the blower 91.

[0060] Refer to Figure 6 , along the front-back direction YY, that is, along the direction from the diffuser cavity 12 to the heat exchange cavity 13, the diffuser cavity 12 is gradually expanding, and the lateral flow area of the gas in the diffuser cavity 12 gradually becomes larger. As the lateral flow area of the gas gradually becomes larger, the flow rate of the gas gradually decreases, the dynamic pressure becomes smaller, and the static pressure becomes larger. The larger static pressure can help the air flow flowing out from the air outlet 15 more effectively overcome the air resistance, so that it can reach a farther distance relative to the air outlet 15.

[0061] The air duct assembly 10 further includes a grille 98, and the grille 98 connects the lower ends of the rear shell 24 of the fan chamber and the front shell 31 of the fan chamber. A plurality of through holes are formed in the grille 98, and the gas passing through the air return opening 14 can enter the fan chamber 11 through the plurality of through holes. The arrangement of the grille 98 can effectively prevent larger foreign objects from entering the fan chamber 11 and affecting the operation of the fan 91. The grille 98 is arranged in a grid shape to increase the through holes as much as possible and reduce the influence on the air flow. Optionally, the grille 98 as a whole can be arranged in an arc shape; or, the grille 98 can further include a first grille 981 and a second grille 983 arranged at an angle. The first grille 981 is connected to the lower end of the rear shell 24 of the fan chamber and extends forward in the front-rear direction YY. The second grille 983 is connected to one end of the first grille 981 far from the rear shell 24 of the fan chamber and extends upward. One end of the second grille 983 far from the first grille 981 is connected to the front shell 31 of the fan chamber. Wherein, the first grille 981 and the second grille 983 can be of an integral structure, which has good integrity and is easy to process, or the first grille 981 and the second grille 983 can also be of a split structure and are connected by means of bolts or welding. The first grille 981 and the second grille 983 arranged at an angle are far from the fan 91, and there is sufficient space between the air inlet side 91a of the fan 91 and the grille 98, which is more convenient for the fan 91 to draw air.

[0062] In the related art, the volute tongue is often set as an integral structure and processed by injection molding or the like. The volute tongue has a length direction (axial direction). If the volute tongue is injection molded, due to the presence of the part where the volute tongue is connected and matched with other structures, it will hinder the demolding of the volute tongue along its own length direction, resulting in difficult demolding of the volute tongue and reducing the production efficiency.

[0063] In view of this, please refer to Figure 7 , in some embodiments of the present application, a first split structure 45 and a second split structure 41 that is integrally formed with the first split structure 45 are provided at the transition between the fan chamber 11 and the diffuser chamber 12 of the air duct assembly 10, and a part of the second split structure 41 forms a volute tongue 41a.

[0064] 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. The opposite sides of the shell body 51 are connected to the front shell 31 of the fan chamber and the water receiving tray 60. The first split structure 45 is connected to one end of the shell body 51 far from the water receiving tray 60 and is located above the front shell 31 of the fan chamber. The first split structure 45 is used to provide support for the volute main body. Optionally, as Figure 8As shown, the housing body 51 and the first split structure 45 can be an integral structure, that is, the first split structure 45 and the housing body 51 are formed together. In this way, the connection firmness between the housing body 51 and the first split structure 45 can be improved, and the assembly steps of the housing 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 means such as gluing and snap connection. The present application does not limit this. The second split structure 41 is disposed on the first split structure 45 and has a first volute tongue guiding surface 411 facing the blower 91 for guiding the air flow.

[0065] Please refer to Figures 7 to 9 , the first split structure 45 includes a connected support portion 45a and a first connection portion 45b. The support portion 45a is used to connect the housing body 51, and the first connection portion 45b is disposed on a side of the support portion 45a facing the impeller 911 of the blower 91 for mating connection with the second split structure 41. Correspondingly, the second split structure 41 includes a connected volute tongue 41a and a second connection portion 41b. The volute tongue 41a faces the impeller 911 and extends along the axial direction of the impeller 911. The first volute tongue guiding surface 411 is disposed on a side of the volute tongue 41a facing the impeller 911. The second connection portion 41b is disposed between the volute tongue 41a and the support portion 45a and is detachably connected to the first connection portion 45b.

[0066] Among them, the first connection portion 45b and the second connection portion 41b can be connected by one or several of the ways such as bolt connection and snap connection. The present application does not limit this. However, in an optional embodiment, the first connection portion 45b and the second connection portion 41b are connected by a snap connection. For example, the first connection portion 45b is provided with a protruding snap structure, and the second connection portion 41b is provided with a positioning structure corresponding to the snap structure. The number and arrangement of the snap structure and the positioning structure are not limited. For example, the snap structure can be provided in the middle or at both ends of the support portion 45a along the vertical direction ZZ, and the number thereof can be one or two, etc. The setting position of the positioning structure corresponds to the snap structure one by one, so that the snap structure and the positioning structure can be correspondingly connected in a one-to-one manner.

[0067] Further, a connection groove 45e with an opening facing the support portion 45a may be provided in the second connection portion 41b, and the first connection portion 45b extends into the connection groove 45e from the above-mentioned opening. The first connection portion 45b can be filled into the connection groove 45e, and the first connection portion 45b can be configured to be elastic. When the first connection portion 45b is located in the connection groove 45e, the surface of the first connection portion 45b elastically abuts against the inner wall of the connection groove 45e that encloses the opening. In this way, a tight fit between the first connection portion 45b and the second connection portion 41b can be achieved, so as to connect the second split structure 41 and the first split structure 45 more closely. Of course, in some other structural forms, a connection groove 45e with an opening facing the volute tongue 41a may also be provided in the first connection portion 45b, and the second connection portion 41b extends into the connection groove 45e. The connection method and effect are not elaborated here.

[0068] Obviously, by setting the structure at the volute tongue as two parts, namely the detachable second split structure 41 and the first split structure 45, the first split structure 45 and the second split structure 41 can be processed and formed separately, and the volute tongue 41a is formed by a part of the second split structure 41. In this way, the first split structure 45 and the second split structure 41 can be demolded separately. For example, along the left-right direction XX, the cross-sectional shape of the second split structure 41 is uniform and unchanged. Then, after the second split structure 41 is injection-molded, axial demolding can be performed, that is, demolding along the length direction of the volute tongue 41a itself; for the first split structure 45, relevant structures for cooperating with the shell body 51 are provided on the first split structure 45. After the first split structure 45 is injection-molded, it can be demolded radially, that is, in a direction perpendicular to the length direction of the volute tongue 41a itself. 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 the efficiency is higher than directly demolding an integrally formed volute tongue.

[0069] Relatively speaking, the mold design for the first split structure 45 and the second split structure 41 separately is also relatively simple, thereby reducing costs. Among them, the first split structure 45 can also be integrally formed with other structures (such as the shell body 51), that is, the first split structure 45 is integrated into other structures and is manufactured together when other structures are formed and demolded.

[0070] In addition, different second split structures 41 can be selected according to specific actual usage situations. When replacement is needed, only the second split structure 41 needs to be disassembled and assembled from the first split structure 45, making the structure more flexible and improving the structural applicability; or when maintenance of the volute tongue 41a is required, the 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.

[0071] Please refer to Figure 7 and Figure 9 In some embodiments of the present application, the volute tongue 41a extends along the axial direction of the impeller 911. The volute tongue 41a includes a connected first plate segment 413 and a second plate segment 414. The first plate segment 413 is configured to extend towards the diffuser chamber lower housing 50, and the second plate segment 414 is configured to face the blower 91 and extend substantially in the up and down direction. The extending direction of the first plate segment 413 and the extending 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 guiding surface 411. Optionally, the first volute tongue guiding surface 411 is arranged as an arc surface. The air flow blown out by the blower 91 will flow into the diffuser chamber 12 under the guidance of the first volute tongue guiding surface 411.

[0072] Please refer to Figure 7 To improve the air flow noise, a plurality of guiding ribs 42 are further provided on the volute tongue 41a. The guiding ribs 42 are in the shape of long strips, and a plurality of guiding ribs 42 are spaced apart and protrude from the first volute tongue guiding surface 411 along the extending direction of the volute tongue 41a. The guiding ribs 42 can be an integral structure with the second split structure 41, for example, by integral injection molding. In this way, the firmness of the connection between the two can be improved, and the assembly steps can be reduced. Of course, the guiding ribs 42 can also be a split structure with the second split structure 41 and be fixed by means such as bonding or snap connection.

[0073] In one embodiment, the guiding rib 42 includes a first rib segment 421 and a second rib segment 422. Both the first rib segment 421 and the second rib segment 422 have a head end and a tail end. The first rib segment 421 is arranged on the first plate segment 413, and the end thereof is connected to the first volute tongue guiding 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 guiding surface 411.

[0074] Two adjacent guiding ribs 42 and the first volute tongue guiding surface 411 define a guiding groove 43. When the blower 91 is working, part of the air flow sent out by it will blow towards the first plate segment 413, and part will blow towards the second plate segment 414. The air flow blowing towards the first plate segment 413 will flow into the diffuser chamber 12 under the guidance of the first rib segment 421, and the air flow blowing towards the second plate segment 414 will flow along the second rib segment 422 under the guidance of the second rib segment 422, avoiding the circulation of this part of the air flow near the volute tongue 40.

[0075] In this way, when the air flow blown out by the fan 91 flows through the second split structure 41, due to the existence of the diversion grooves 43, the air flow with noise will be separated, so that the energy of the noise can be weakened, improving the user experience. Under the diversion effect of the multiple diversion ribs 42, the air flow in the axial direction can be reduced, thereby reducing the pressure loss of the air flow during the process of flowing to the air outlet 15;

[0076] Obviously, when the volute tongue 41a has the diversion ribs 42, in the case of integral molding, the multiple diversion ribs 42 arranged along the length direction of the volute tongue 40 will undoubtedly more restrict the axial demolding of the volute tongue 41a. That is to say, the separately formed second split structure 41 and the first split structure 45 in this application are more conducive to the formation of the diversion ribs 42, so as to form the diversion grooves 43 to achieve the purpose of reducing the air flow noise.

[0077] Please refer to Figure 9 , in some embodiments, the second connecting portion 41b includes a third plate segment 415 and a fourth plate segment 416 respectively arranged at the upper and lower ends of the volute tongue 41a. The third plate segment 415 and the fourth plate segment 416 are located at opposite ends of the volute tongue 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 in a connection form that is connected end to end in sequence. Among them, both the third plate segment 415 and the fourth plate segment 416 extend towards the support portion 45a, and together with the first plate segment 413 and the second plate segment 414, they construct a connection groove 45e with an opening facing the support portion 45a. One end of the third plate segment 415 far from the first plate segment 413 and one end of the fourth plate segment 416 far from the second plate segment 414 are arranged at intervals, and the above-mentioned opening is constructed.

[0078] The first connecting portion 45b can be configured to be elastic. When the first connecting portion 45b is located in the connection 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. Through the elastic action of the third plate segment 415, the fourth plate segment 416 and the first connecting portion 45b, a tight fit between the first connecting portion 45b and the second connecting portion 41b can be achieved, so as to connect the second split structure 41 and the first split structure 45 more tightly.

[0079] Please continue to refer to 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, and the first connection 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 tongue 41a and extend into the connection groove 45e. When the first connection portion 45b is cooperatively connected with the second connection portion 41b, the fifth plate segment 453 abuts against the inner surface of the third plate segment 415, and the sixth plate segment 454 abuts against 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 and respectively apply an outward force to the third plate segment 415 and the fourth plate segment 416. After receiving the above-mentioned forces, the third plate segment 415 and the fourth plate segment 416 tend to maintain their original states and thus respectively apply an inward force to 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 achieve a tight fit. In the embodiments of the present application, the form of the plate segments enables the first connection portion 45b and the second connection portion 41b to have better elasticity, and the contact area between the plate segments is relatively large, and the connection is more stable.

[0080] To further improve the connection stability, in some embodiments, the third plate segment 415 is further provided with a first fastening position 4151, the fourth plate segment 416 is provided with a second fastening position, the fifth plate segment 453 is provided with a first fastening buckle 4531, and the sixth plate segment 454 is provided with a second fastening buckle. Among them, for the convenience of processing, the first fastening position 4151 and the second fastening position can be set in the form of grooves or through grooves, while the first fastening buckle 4531 and the second fastening buckle are set in the form of hooks 3111. The first fastening buckle 4531 is cooperatively connected with the first fastening position 4151, and the second fastening buckle is cooperatively connected with the second fastening position, which can further increase the constraint between the first connection portion 45b and the second connection portion 41b, so that the connection between the two is more stable and reliable.

[0081] It can be understood that a first fastening buckle 4531 can also be provided on the third plate segment 415, a second fastening buckle can be provided on the fourth plate segment 416, a first fastening position 4151 can be provided on the fifth plate segment 453, and a second fastening position can be provided on the sixth plate segment 454. The present application does not limit this much.

[0082] Please refer to Figure 9, Further, in the direction close to the support portion 45a, the distance between the third plate segment 415 and the fourth plate segment 416 gradually decreases. As can be seen from the figure, along the direction close to the support portion 45a, the second connecting portion 41b formed by the third plate segment 415 and the fourth plate segment 416 is in a flared shape; correspondingly, along the direction close to the volute tongue 41a, the first connecting portion 45b formed by the fifth plate segment 453 and the sixth plate segment 454 is in a tapered shape; the third plate segment 415 gives the fifth plate segment 453 a force towards the volute tongue 41a, and the fourth plate segment 416 also gives the sixth plate segment 454 a force towards the volute tongue 41a, so that the support portion 45a has a tendency to move closer to the volute tongue 41a, making it not easy for the first split structure 45 to be separated from the second split structure 41, and further improving the connection tightness between the first split structure 45 and the second split structure 41.

[0083] As Figure 9 shown, the volute tongue 41a and the support portion 45a are arranged at intervals, so as to define 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 composed of two plate segments to ensure structural strength, and the setting of the hollow cavity 16 can save materials to a large extent and reduce costs on this basis. It can be understood that if there are some convex structures or groove structures on the inner wall surface of the hollow cavity 16, such as convex or groove structures provided for cooperation with the shell body 51, then when the volute tongue structure is integrally formed and demolded, the core (the part filled in the hollow cavity 16) is difficult to be removed along the length direction of the volute tongue 41a itself. In this application, the first split structure 45 and the second split structure 41 are two separate parts. When they are formed separately, demolding can be carried out in a direction perpendicular to the length direction of the volute tongue 41a, so that the production process can be smoother.

[0084] Combined with the foregoing embodiments, a flow guiding rib 42 is provided on the first volute tongue flow guiding 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, in this structural form, if the second split structure 41 and the first split structure 45 are integrally formed, due to the existence of the flow guiding rib 42, it is difficult for the second split structure 41 and the first split structure 45 to be disengaged along their own length directions. In the related art, there are attempts to demold radially (the direction perpendicular to the length direction of the volute tongue 41a itself). However, in this way, to ensure the integrity of the volute tongue 41a, the core of the hollow cavity 16 still needs to be demolded along the length direction of the volute tongue 41a itself. Combining the foregoing analysis, the demolding of the core here is also relatively difficult. Therefore, in this application, the structure forming the volute tongue is divided into two parts, namely the second split structure 41 and the first split structure 45, and the second split structure 41 and the first split structure 45 are formed separately. In this way, when the second split structure 41 is formed, it can be relatively moved radially and / or along its own length direction with respect to the mold for demolding, and the same applies to the first split structure 45, which is more convenient for production. After the second split structure 41 and the first split structure 45 are formed, the two are connected to form the hollow cavity 16. In this way, not only can some complex structural designs of the volute tongue 41a be realized, but also the production efficiency is high, and the detachable second split structure 41 and the first split structure 45 can be conveniently replaced to improve the structural applicability.

[0085] Please refer to Figures 7 to 9 , in the embodiment of the present application, the outer surface of the third plate segment 415 forms a second volute tongue flow guiding surface 412, and the second volute tongue flow guiding surface 412 is smoothly connected to the first volute tongue flow guiding surface 411. The seventh plate segment 455 and the eighth plate segment 456 of the support portion 45a respectively have a first surface 45a1 facing the diffuser cavity 12 and a second surface 45a3 facing the flow guiding plate 52. The air flow can sequentially pass through the first volute tongue flow guiding surface 411, the second volute tongue flow guiding surface 412 and the first surface 45a1 under the guidance of the volute tongue 40. Part of the air flow can also enter the fan cavity 11 through the return channel 31, and this part of the air flow flows through the second surface 45a3.

[0086] In one embodiment, the fifth plate segment 453 is disposed closer to the center of the hollow cavity 16 than the seventh plate segment 455, so that the two cooperate to form a first stepped structure 45c lower than the first surface 45a1. The third plate segment 415 overlaps the first stepped structure 45c, so that the second volute tongue guiding surface 412 is higher than the first surface 45a1 or flush with the first surface 45a1. The sixth plate segment 454 and the eighth plate segment 456 cooperate to form a second stepped 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 stepped structure 45d, so that the outer surface of the fourth plate segment 416 is flush with the second surface 45a3. Exemplarily, the second volute tongue guiding surface 412 is flush with the first surface 45a1. Such a design can eliminate the unevenness at the splicing position, and the air flow is more smooth when flowing from the second volute tongue guiding surface 412 to the first surface 45a1, reducing energy loss and pressure loss. In addition, the possibility of air leakage can be effectively reduced, and the warping of the plate segment caused by the air flow can be avoided, improving the structural stability.

[0087] In another embodiment, the fourth plate segment 416 forms a third stepped structure. The sixth plate segment 454 overlaps the third stepped structure, and the outer surface of the sixth plate segment 454 is higher than the outer surface of the fourth plate segment 416 or flush with the outer surface of the fourth plate segment 416. Similarly, this is beneficial to make the air flow more smooth when flowing in the return channel 31, reducing energy loss and pressure loss, reducing air leakage, and avoiding the warping of the fourth plate segment 416 caused by the air flow, further improving the structural stability.

[0088] The above are the specific implementation manners related to the air duct assembly 10. On this basis, the volute tongue 40 can be applied to the indoor unit proposed in the present application. Since the indoor unit proposed in the implementation of the present application adopts all the technical solutions of the above all embodiments, it has at least all the beneficial effects brought by the technical solutions of the above embodiments, which will not be elaborated one by one here.

[0089] In the drawings of this embodiment, the same or similar reference numerals correspond to the same or similar components; in the description of the present application, it should be understood that if there are terms such as "upper", "lower", "left", "right", etc. indicating the orientation or positional relationship, it is based on the orientation or positional relationship shown in the drawings. It is only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation. Therefore, the terms describing the positional relationship in the drawings are only for illustrative purposes and cannot be understood as a limitation of the present application. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific situations.

[0090] The above are only the preferred embodiments of the present application and are not intended to limit the present application. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. An air duct assembly, characterized in that, It has a fan chamber and a diffuser chamber that are connected. The fan chamber is used to install a fan, and at the transition between the fan chamber and the diffuser chamber, there are provided: A first split structure, including a connected support part and a first connection part. The first connection part is provided on the side of the support part facing the fan; And A second split structure, which is integrally formed separately from the first split structure, including a connected volute tongue and a second connection part. The volute tongue faces the fan, and the second connection part is provided between the volute tongue and the support part and is detachably connected to the first connection part.

2. The air duct assembly according to claim 1, wherein The support part and the volute tongue are spaced apart, and the support part, the volute tongue, the first connection part and the second connection part constitute a hollow cavity.

3. The air duct assembly according to claim 1, wherein, The air duct assembly further includes a plurality of flow guiding ribs. The volute tongue has a first volute tongue flow guiding surface and extends along the axial direction of the fan. The plurality of flow guiding ribs are convexly provided on the first volute tongue flow guiding surface at intervals along the extending direction of the volute tongue, and adjacent two of the flow guiding ribs and the first volute tongue flow guiding surface define a flow guiding groove.

4. The air duct assembly according to claim 3, wherein The volute tongue includes a connected first plate segment and a second plate segment. The first plate segment and the second plate segment cooperate to define the first volute tongue flow guiding surface. The first plate segment is configured to extend towards the first split structure, and the second plate segment is configured to face the fan. The extending direction of the first plate segment and the extending direction of the second plate segment are arranged at an angle; The flow guiding rib includes a connected first rib segment and a second rib segment. The first rib segment is provided on the first plate segment and its end is connected to the first volute tongue flow guiding surface. The second rib segment is provided on the second plate segment.

5. The air duct assembly according to claim 3, characterized in that, The second connection part includes a third plate segment and a fourth plate segment respectively provided at the upper and lower ends of the volute tongue. The third plate segment and the fourth plate segment both extend towards the support part. The third plate segment, the fourth plate segment and the volute tongue constitute a connection groove. The first connection part is located in the connection groove and elastically abuts against the inner wall surfaces of the third plate segment and the fourth plate segment.

6. The air duct assembly according to claim 5, wherein In the direction close to the support part, the distance between the third plate segment and the fourth plate segment gradually decreases.

7. The air duct assembly according to claim 5, characterized in that, The first connection part includes a fifth plate segment and a sixth plate segment provided at the upper and lower ends of the support part. The fifth plate segment and the sixth plate segment both extend towards the volute tongue; Wherein, 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.

8. The air duct assembly according to claim 7, characterized in that, The third plate segment is provided with a first locking position, the fourth plate segment is provided with a second locking 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 cooperatively connected with the first locking position, and the second buckle is cooperatively connected with the second locking position; And / or, the volute tongue and the support part are spaced apart to define a hollow cavity between the volute tongue and the support part.

9. The air duct assembly according to claim 1, wherein, The volute tongue has a first volute tongue guiding surface. The second connecting portion includes a third plate segment connected to one end of the volute tongue. The third plate segment extends towards the supporting portion, and a second volute tongue guiding surface is formed on the outer surface of the third plate segment. The second volute tongue guiding surface is smoothly connected to the first volute tongue guiding surface. The supporting portion has a first surface. The first connecting portion and the supporting portion cooperate to form a first step structure lower than the first surface. The third plate segment is lapped on the first step structure so that the second volute tongue guiding surface is higher than the first surface or flush with the first surface.

10. The air duct assembly according to claim 9, characterized in that, The second connecting portion further includes a fourth plate segment connected to the end of the volute tongue away from the third plate segment. The fourth plate segment extends towards the supporting portion. The supporting portion further has a second surface disposed at an angle to the first surface. The first connecting portion and the supporting portion further cooperate to form a second step structure. The fourth plate segment is lapped on the second step structure so that the outer surface of the fourth plate segment is flush with the second surface.

11. The air duct assembly according to claim 9, characterized in that, The second connecting portion further includes a fourth plate segment connected to the end of the volute tongue away from the third plate segment. The fourth plate segment extends towards the supporting portion, and the fourth plate segment forms a third step structure. The supporting 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 supporting portion. The sixth plate segment extends towards the volute tongue, and the outer surface of the sixth plate segment is smoothly connected to the second surface. The sixth plate segment is lapped 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.

12. The air duct assembly according to any one of claims 1 to 11, characterized in that, It includes a first housing and a second housing. The second housing includes a front housing of the fan chamber, a lower housing of the diffuser chamber, and a water receiving tray. The opposite sides of the lower housing of the diffuser chamber are respectively connected to the water receiving tray and the front housing of the fan chamber. The first housing at least cooperates with the front housing of the fan chamber to define the fan chamber, at least cooperates with the lower housing of the diffuser chamber to define the diffuser chamber, and cooperates with the water receiving tray to define a heat exchange chamber. The fan chamber, the diffuser chamber, and the heat exchange chamber are communicated in sequence. Wherein, the first split structure is disposed on the side of the lower housing of the diffuser chamber away from the water receiving tray and above the front housing of the fan chamber.

13. The air duct assembly according to claim 12, wherein The lower housing of the diffuser chamber includes a housing body. The opposite sides of the housing body are connected to the water receiving tray and the front housing of the fan chamber. The 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.

14. An air duct machine, characterized in that, It includes an outdoor unit and an indoor unit. The indoor unit includes a fan, a heat exchanger, and the air duct assembly according to any one of claims 1 to 13. The air duct assembly further has a heat exchange chamber communicated with the diffuser chamber. The fan is disposed in the fan chamber, and the heat exchanger is disposed in the heat exchange chamber.

15. The air duct machine according to claim 14, characterized in that, The air duct assembly is further provided with a return air inlet communicated with the fan chamber and an air outlet communicated with the heat exchange chamber. The indoor unit is further provided with: The air duct air inlet part is connected to the bottom of the air duct assembly and has an air duct air inlet interface. The air duct air inlet interface is communicated 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 The air duct air outlet part is connected to one side of the air duct assembly and has an air duct air outlet interface. The air duct air outlet interface is communicated with the air outlet.

Images