Indoor unit

Abstract

The invention discloses an indoor unit. The indoor unit comprises an impeller and a volute tongue. The volute tongue is arranged on one side of the impeller and provided with a windward side, a wind guide face and a transition face, the windward side faces the impeller, an included angle is formed between the wind guide face and the windward side, the wind guide face is configured to guide airflow flowing out of the impeller, and the transition face is connected with the windward side and the wind guide face. The transition face is provided with a sinking area, and the sinking area sinks in the direction close to the air guide face so as to reduce the height of the sinking area relative to the impeller. According to the technical scheme, the overall noise of the indoor unit can be reduced, and the user experience is improved.

Description

Technical Field

[0001] This application relates to the technical field of air conditioners, and particularly to an indoor unit. Background Art

[0002] Currently, most air conditioner indoor units include an impeller and a volute tongue. When the impeller rotates, it can generate flowing air. The volute tongue is arranged on one side of the impeller and is used to guide this part of the air to flow within the housing of the indoor unit.

[0003] However, since the volute tongue is continuously strongly impacted by the air flow near the impeller, noise is easily generated near the volute tongue, which relatively affects the user experience. Summary of the Invention

[0004] An embodiment of this application provides an indoor unit, which can reduce the noise of the indoor unit and improve the user experience.

[0005] The indoor unit proposed by the embodiment of this application includes:

[0006] An impeller; and a volute tongue, arranged on one side of the impeller,

[0007] The volute tongue has a windward surface, a wind guiding surface and a transition surface. The windward surface faces the impeller. The wind guiding surface is arranged at an angle with the windward surface and is configured to guide the air flow flowing out of the impeller. The transition surface connects the windward surface and the wind guiding surface;

[0008] Wherein, the transition surface has a sunken area, and the sunken area is recessed in the direction close to the wind guiding surface to reduce the height of the sunken area relative to the impeller.

[0009] In one embodiment, compared with the intersection line between the sunken area and the windward surface, the intersection line between the sunken area and the wind guiding surface is arranged farther away from the impeller.

[0010] In one embodiment, the sunken area is an arc surface arched in the direction close to the wind guiding surface.

[0011] In one embodiment, the transition surface is further provided with a arched area, and the arched area arches in the direction away from the wind guiding surface and is smoothly connected with the sunken area.

[0012] In one embodiment, the volute tongue extends along the axial direction of the impeller. The sunken area is arranged in the middle of the volute tongue and extends towards both ends of the volute tongue. The arched area is arranged at both ends of the sunken area along the extending direction of the volute tongue.

[0013] In one embodiment, the volute tongue has a width direction perpendicular to its own extending direction, and the width of the sunken area along the width direction gradually decreases from the middle of the volute tongue towards both ends of the volute tongue.

[0014] In one embodiment, in the direction from the middle of the volute tongue to both ends of the volute tongue, the distance between the sinking area and the impeller gradually decreases.

[0015] In one embodiment, the sinking area is symmetrically arranged with respect to the midline of the volute tongue perpendicular to its own extending direction.

[0016] In one embodiment, the volute tongue further includes a plurality of flow guiding ribs, and the plurality of flow guiding ribs are at least connected to the transition surface and are arranged at intervals along the axial direction of the impeller;

[0017] Projecting along the axial direction of the impeller, the flow guiding rib has a flow guiding rib profile line, and the flow guiding rib profile line is parallel to the surface of the sinking area.

[0018] In one embodiment, the indoor unit includes:

[0019] A first housing;

[0020] A second housing, connected to the first housing and defining a blower cavity, a diffuser cavity and a heat exchange cavity that are sequentially communicated with the first housing. The impeller is arranged in the blower cavity, and the volute tongue is arranged at the junction of the blower cavity and the diffuser cavity and is configured to guide the air flow in the blower cavity to the diffuser cavity; and

[0021] A heat exchanger, and the heat exchanger is arranged in the heat exchange cavity.

[0022] In one embodiment, the second housing includes a diffuser cavity lower housing, and the first housing and the diffuser cavity lower housing define the diffuser cavity;

[0023] The volute tongue includes a volute tongue main body and a support structure. The support structure is connected to the side of the diffuser cavity lower housing close to the blower cavity, the volute tongue main body is connected to the side of the support structure away from the diffuser cavity lower housing, and the windward surface, the transition surface and at least part of the air guiding surface are arranged on the surface of the volute tongue main body facing away from the support structure.

[0024] In one embodiment, the support structure and the diffuser cavity lower housing are of an integral structure;

[0025] And / or, the volute tongue main body and the support structure are of an integral structure.

[0026] In the embodiment of the present application, since the sinking area is recessed, the thickness of the volute tongue near the impeller is reduced to a certain extent, enabling the air flow on the air outlet side of the impeller to be more easily diverted, thereby improving efficiency. Moreover, setting the sinking area can also reduce the angle between the surface of the sinking area and the air flow direction. The air flow flowing towards the air guiding surface fits more closely to the surface of the sinking area, the air flow is smoother, the impact on the volute tongue is reduced, and the generated noise is smaller, thus reducing the overall noise of the indoor unit and enhancing the user experience. BRIEF DESCRIPTION OF THE DRAWINGS

[0027] 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 the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on the structures shown in these drawings.

[0028] Figure 1 Structural schematic diagram of an embodiment of the indoor unit of the present application;

[0029] Figure 2 For Figure 1 Exploded structural schematic diagram of the indoor unit;

[0030] Figure 3 For Figure 1 Top view structural schematic diagram of the indoor unit;

[0031] Figure 4 For Figure 3 Cross-sectional structural schematic diagram of the indoor unit at section A - A;

[0032] Figure 5 Top view structural schematic diagram of a part of the structure of another embodiment of the indoor unit of the present application;

[0033] Figure 6 For Figure 4 Enlarged structural schematic diagram at position B;

[0034] Figure 7 Cross-sectional structural schematic diagram of an embodiment of the second housing of the present application at section A - A;

[0035] Figure 8 For Figure 7 Enlarged structural schematic diagram at position C;

[0036] Figure 9 Exploded structural schematic diagram of another embodiment of the second housing of the present application.

[0037] Explanation of the reference numerals in the drawings:

[0038] 1. Indoor unit; 10. Air duct assembly; 11. Fan chamber; 12. Diffuser chamber; 13. Heat exchange chamber; 14. Air inlet; 15. Air outlet; 16. Hollow cavity; 20. First housing; 20a. Cover; 21. Upper shell of fan chamber; 22. Upper shell of diffuser chamber; 23. Upper shell of heat exchange chamber; 30. Second housing; 40. Volute tongue; 41. Volute tongue body; 41a. Windward surface; 41b. Air guiding surface; 41c. Transition surface; 41c1. Sinking area; 41c2. Arching area; 42. Flow guiding rib; 45. Support structure; 50. Lower shell of diffuser chamber; 52. Deflector; 60. Water receiving tray; 70. Side enclosure; 91. Fan; 91a. Air inlet side; 91b. Air outlet side; 911. Impeller; 913. Motor; 92. Heat exchanger; 93. Electric control box; 98. Grille.

[0039] The realization of the purpose of this application, its functional features and advantages will be further described in conjunction with the embodiments and with reference to the accompanying drawings. Detailed implementation manners

[0040] To make the purpose, technical solutions and advantages of this application clearer, the following will further describe the embodiments of this application in detail in conjunction with the accompanying drawings.

[0041] When the following description relates to the accompanying drawings, unless otherwise indicated, the same numbers in different drawings represent the same or similar elements. The implementation manners described in the following exemplary embodiments do not represent all implementation manners consistent with this application. On the contrary, they are merely examples of devices and methods that are consistent with some aspects of this application as detailed in the appended claims.

[0042] In the description of this application, it should be understood that the terms "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 this application can be understood according to specific circumstances. In addition, in the description of this application, unless otherwise specified, "a plurality of" 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.

[0043] 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 this application. The term "and / or" used herein includes any and all combinations of one or more of the related listed items.

[0044] An embodiment of the present application provides an indoor unit 1. Optionally, the indoor unit 1 can be a duct machine. The indoor unit 1 is connected to an outdoor unit through cables, pipelines, etc. to jointly operate to regulate the indoor environment. It can be understood that the indoor unit 1 can be installed in the room in the form of a ceiling, etc., for blowing air into the room.

[0045] In the present application, the up-down direction ZZ, the front-back direction YY, and the left-right direction XX are defined, 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 in pairs.

[0046] Please refer to Figure 1 and Figure 2 , in the embodiment of the present application, the indoor unit 1 includes an air duct assembly 10, a fan 91, a heat exchanger 92, and an electric control box 93.

[0047] The air duct assembly 10 is used to construct an air duct suitable for the indoor unit 1 for gas flow. Specifically, the air duct assembly 10 is mainly a structure composed of a housing, and the outer contour of the air duct assembly 10 can be generally rectangular parallelepiped-shaped. Please refer to Figures 2 to 4 , the air duct assembly 10 includes a first housing 20 and a second housing 30 connected to each other. The first housing 20 and the second housing 30 define a fan chamber 11, a diffuser chamber 12, and a heat exchange chamber 13 that are connected in sequence, and form an air inlet 14 communicating with the fan chamber 11 and an air outlet 15 communicating with the heat exchange chamber 13, so that gas can enter the air duct assembly 10 from the air inlet 14, and sequentially pass through the fan chamber 11, the diffuser chamber 12, and the heat exchange chamber 13, and finally flow out from the air outlet 15.

[0048] 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 the requirements of 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 embodiment of the present application does not limit the connection method of 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.

[0049] Please refer to Figure 2 and Figure 4, the first housing 20 includes a cover body 20a and two side enclosing plates 70. The two side enclosing plates 70 are spaced apart in the left-right direction, and the cover body 20a is generally disposed above the two side enclosing plates 70. The two sides of the cover body 20a in the left-right direction are respectively connected to the two side enclosing plates 70. Along the front-back direction from the rear to the front, the cover body 20a includes a blower chamber upper shell 21, a diffuser chamber upper shell 22, and a heat exchange chamber upper shell 23 that are sequentially connected. The second housing 30 is spaced apart from the cover body 20a in the up-down direction, and includes a connecting deflector 52, a volute tongue 40, a diffuser chamber lower shell 50, and a water receiving tray 60. The volute tongue 40 is disposed at the transition portion between the blower chamber 11 and the diffuser chamber 12; the deflector 52 is disposed below the volute tongue 40 and is used to guide the airflow below the volute tongue 40; the diffuser chamber lower shell 50 is disposed on the front side of the volute tongue 40, and one end of the diffuser chamber lower shell 50 away from the volute tongue 40 is connected to the water receiving tray 60. The blower chamber upper shell 21 at least defines the blower chamber 11 with the deflector 52 and the side enclosing plates 70, the diffuser chamber upper shell 22 at least defines the diffuser chamber 12 with the diffuser chamber lower shell 50 and the side enclosing plates 70, and the heat exchange chamber upper shell 23 defines the heat exchange chamber 13 with the water receiving tray 60 and the side enclosing plates 70.

[0050] Please continue to refer to Figure 2 and Figure 4 , the air duct assembly 10 further includes a grille 98 disposed at the air inlet 14. The grille 98 is connected to the deflector 52 and the blower chamber upper shell 21. A plurality of through holes are formed in the grille 98, and gas can enter the blower chamber 11 through the plurality of through holes. The setting of the grille 98 can effectively prevent larger foreign objects from entering the blower chamber 11 and affecting the operation of the blower 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 airflow. Optionally, the grille 98 can be integrally arranged in an arc shape, or the grille 98 can be formed by connecting two grille plate segments arranged at an angle.

[0051] The blower 91 is disposed in the blower chamber 11, and can extract the gas at the air inlet 14 and do work on it to make it flow to the diffuser chamber 12 at a relatively fast flow rate, providing power for the gas circulation in the above air duct. The blower 91 can be a cross-flow blower, a centrifugal blower, an axial-flow blower, etc. As Figure 5As shown, taking the 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 wall 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 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 of the impeller 911 in the circumferential direction that is spaced from the air inlet side 91a is generally oriented towards the diffuser chamber 12, and this side of the impeller 911 is defined as the air outlet side 91b. A plurality of blades are distributed along the circumference of the impeller 911. When the motor 913 drives the impeller 911 to rotate, the rotating blades can cause the gas to flow from the air inlet side 91a to the air outlet side 91b. The cross-flow fan has the advantages of energy saving, large air volume, low noise, and simple installation.

[0052] Combined with Figure 4 , the heat exchanger 92 is housed in the heat exchange chamber 13 and is used to exchange heat with the gas flowing through the heat exchange chamber 13 and passing through the heat exchanger 92, so as to cool or heat the gas. For example, a plurality of refrigerant pipes are arranged inside the heat exchanger 92, and the gas exchanges heat with the refrigerant in the pipes when passing through the heat exchanger 92, thereby reducing the temperature and forming low-temperature air. Optionally, the heat exchanger 92 can be arranged in a U shape, an arc shape or a wave shape, and is composed of a single heat exchange fin or a combination of multiple heat exchange fins.

[0053] An electronic control box 93 is provided with an electronic control board assembly. A variety of electronic components are integrated on the electronic control board assembly, which is used for electrically connecting devices such as the fan 91 and for overall control of the overall operating conditions of the indoor unit 1. Inevitably, a relatively large amount of heat will be generated during the operation of the electronic components. In the embodiment 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 by the air flow in 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 1, and extend the service life.

[0054] In some embodiments of the present application, when the indoor unit 1 is operating, the motor 913 rotates to drive the impeller 911 to rotate, and the air flow flows out from the air outlet side 91b of the impeller 911. The volute tongue 40 is arranged near the air outlet side 91b of the impeller 911 and is used to guide the air flow on the air outlet side 91b. For details, please refer to Figure 6, the volute tongue 40 has a windward surface 41a, a wind guiding surface 41b and a transition surface 41c. The windward surface 41a is arranged facing the air outlet side 91b of the impeller 911 and is spaced apart from the impeller 911. The wind guiding surface 41b extends generally in a direction away from the impeller 911 relative to the windward surface 41a and is arranged at an angle with the windward surface 41a. It should be noted that the wind guiding surface 41b and the windward surface 41a can be curved surfaces or flat surfaces. For example, the windward surface 41a extends generally in the up and down direction, and the wind guiding surface 41b extends generally in the front and back direction. If both the wind guiding surface 41b and the windward surface 41a are flat surfaces, the plane where the wind guiding surface 41b is located and the plane where the windward surface 41a is located intersect and have an angle; or rather, if at least one of the wind guiding surface 41b and the windward surface 41a is a curved surface, the extending direction of the wind guiding surface 41b and the extending direction of the windward surface 41a intersect and are arranged at an angle. The transition surface 41c connects the windward surface 41a and the wind guiding surface 41b and is used to guide a part of the air flow blowing towards the transition surface 41c to the windward surface 41a and the other part to the wind guiding surface 41b. In this way, the volute tongue 40 can play a good role in guiding the air flow, reduce or avoid the circulating flow of gas in the air duct, and improve the efficiency. Optionally, the transition surface 41c is arranged in an arc shape and is smoothly connected to the windward surface 41a and the wind guiding surface 41b so that the air flow flowing towards the windward surface 41a and the wind guiding surface 41b is relatively smooth.

[0055] In one embodiment, the windward surface 41a is an arc surface arched in a direction away from the impeller 911, so that the windward surface 41a fits well with the shape of the outer contour of the impeller 911, so that the air flow circulation area between the windward surface 41a and the impeller 911 is relatively abundant, facilitating air flow circulation and enhancing air flow stability.

[0056] Combined with Figure 4 and Figure 6, Understandably, more airflows are guided towards the air guiding surface 41b, and the transition surface 41c is strongly impacted by the airflows, resulting in a relatively large airflow noise near the volute tongue 40, which has a greater impact on the user experience. For this, in the embodiments of the present application, the transition surface 41c has a sunken area 41c1. The sunken area 41c1 is arranged in the section of the transition surface 41c close to the air guiding surface 41b and is recessed towards the direction close to the air guiding surface 41b. Taking the air guiding surface 41b as a plane as an example, when a part of the air guiding surface 41b is extended towards the transition surface 41c, the height of the sunken surface in the up and down directions is lower than the extended part of the air guiding surface 41b. In this way, the height of the sunken area 41c1 of the present application relative to the impeller 911 is reduced. In the embodiments of the present application, since the sunken area 41c1 is recessed, to a certain extent, the thickness of the part of the volute tongue 40 close to the impeller 911 is reduced, enabling the airflows on the air outlet side 91b of the impeller 911 to be more easily shunted, improving the efficiency. Moreover, setting the sunken area 41c1 can also reduce the included angle between the surface of the sunken area 41c1 and the air flow direction. The airflows flowing towards the air guiding surface 41b are more conforming to the surface of the sunken area 41c1. The airflows are relatively smooth and the impact on the volute tongue 40 is reduced, generating less noise, thereby being able to reduce the overall noise of the indoor unit 1 and improving the user experience.

[0057] The sunken area 41c1 has boundary lines with both the windward surface 41a and the air guiding surface 41b. To make the air flow more smooth, the boundary parts of the sunken area 41c1 with the windward surface 41a and the air guiding surface 41b are both smoothly transitionally connected. In one embodiment, compared with the boundary line of the sunken area 41c1 and the windward surface 41a, the boundary line of the sunken area 41c1 and the air guiding surface 41b is arranged farther away from the impeller 911. In this way, when observing the volute tongue 40 along the direction perpendicular to the air guiding surface 41b, at least part of the sunken area 41c1 can be observed. The sunken area 41c1 extends more towards the air guiding surface 41b, which is beneficial to continuously guiding the airflows flowing towards the air guiding surface 41b, effectively reducing the impact of the airflows on the volute tongue 40, and enabling the airflows to more smoothly transition to the part of the air guiding surface 41b, further reducing the aerodynamic noise.

[0058] Optionally, the sunken area 41c1 can be an inclined surface arranged in one or more sections, that is to say, when the sunken area 41c1 is projected along the axial direction of the impeller 911, the projection contour is an inclined straight line, or multiple straight lines that are connected and bent with each other. In this way, while the volute tongue 40 can play a role in guiding the airflows, the structure is simpler and easier to form.

[0059] And as Figure 6As shown, in one embodiment, the sinking area 41c1 is an arc surface arched towards the air guiding surface 41b. That is to say, when the sinking area 41c1 is projected along the axial direction of the impeller 911, the projection contour is approximately an arc. The sinking area 41c1 arranged as an arc surface can better conform to the flow of the air above the sinking area 41c1, which is beneficial to guiding the air flow in its flowing direction, enabling it to flow more smoothly to the air guiding surface 41b, further improving the air flow effect and reducing noise.

[0060] It can be understood that in some indoor units 1, such as duct units, the impeller 911 has a rotating shaft extending in the left-right direction XX, and along the axial direction parallel to the left-right direction XX, the impeller 911 has a longer length, and the volute tongue 40 is arranged along the axial direction of the impeller 911. The sinking area 41c1 can also be arranged to extend along the axial direction of the impeller 911. To comprehensively reduce the impact of the air flow on the volute tongue 40, the sinking area 41c1 can occupy as much of the volute tongue 40 area as possible along the axial direction of the impeller 911. For example, the entire section of the transition surface 41c along the axial direction of the impeller 911 is set as the sinking area 41c1.

[0061] Please refer to again Figure 5 , in some other embodiments, along the extending direction of the volute tongue 40 itself (left-right direction XX), the transition surface 41c is further provided with a arched area 41c2, which arches away from the air guiding surface 41b and is smoothly connected to the sinking area 41c1 in a transitional manner. With reference to the arched area 41c2, the height of the sinking area 41c1 along the up-down direction ZZ is lower than that of the arched area 41c2. When the air flow above the transition surface 41c flows through the arched area 41c2 and the sinking area 41c1, the flow velocities of the air flow are different, so the time required for the air flow to flow is different, and the air flow will not impact the transition surface 41c at the same time, resulting in a certain phase difference in the noise, avoiding the resonant noise caused by the superposition of noises with the same frequency, effectively reducing the overall noise peak value, and improving the overall noise effect of the fan 91, thus improving the user experience.

[0062] Please refer to Figure 5 , in a specific embodiment, the sinking area 41c1 is arranged in the middle of the volute tongue 40 and extends towards both ends of the volute tongue 40. Along the left-right direction XX, when the fan 91 is operating, the middle part of the air flow flowing through the volute tongue 40 has a larger air flow rate, while the air flow rates at both ends are smaller. The unevenly distributed air flow along the extending direction of the volute tongue 40 may cause eddy currents to be generated, thereby affecting the aerodynamic performance, reducing the air flow efficiency and generating noise. In the embodiment of the present application, by arranging the sinking area 41c1 in the middle of the volute tongue 40, the air flow with a larger flow rate in the middle of the volute tongue 40 can be effectively guided and transitioned. The arched areas 41c2 arranged at both ends of the volute tongue 40 can increase the flow velocity and flow rate of the air flow to a certain extent, make the axial distribution of the air flow more uniform, improve the aerodynamic performance, and reduce noise.

[0063] Please continue to refer to Figure 5 Figure 5 , in an embodiment, the volute tongue 40 has a width direction perpendicular to its own extending direction. The volute tongue 40 extends along the left - right direction XX, and its width direction is generally arranged along the front - back direction YY. The width of the sinking area 41c1 along the width direction YY gradually decreases from the middle of the volute tongue 40 to both ends of the volute tongue 40. It can be understood that the longer the width of the sinking area 41c1, the more continuously the impact of the air flow on the volute tongue 40 can be reduced. Along the extending direction of the volute tongue 40, the air flow is generally distributed with a large flow rate in the middle and a small flow rate on both sides. The larger width in the middle of the sinking area 41c1 is beneficial to effectively guide the air flow with a large flow rate, and the width of the sinking area 41c1 gradually decreases towards both ends of the volute tongue 40, which can make the distribution of the air flow more uniform while ensuring effective air flow guidance and reducing noise, and ensure the aerodynamic performance.

[0064] In some embodiments, since the arched area 41c2 is higher than the sinking area 41c1, and the sinking area 41c1 and the arched areas 41c2 at both ends are smoothly transitioned, along the direction from the middle of the volute tongue 40 to both ends, the height of the sinking area 41c1 gradually increases until it is at least flush with the arched area 41c2. And the gradually decreasing width can not only make the transition between the sinking area 41c1 and the arched area 41c2 smoother, reduce air flow disturbance, but also further increase the flow rate and flow volume of the air flow on both sides, making the air flow more uniform and stable.

[0065] Further, in an embodiment, along the direction from the middle of the volute tongue 40 to both ends of the volute tongue 40, the distance between the sinking area 41c1 and the impeller 911 gradually decreases. Increasing the distance between the volute tongue 40 and the impeller 911 can effectively reduce the impact of the air flow on the volute tongue 40, thereby reducing noise. And it can be understood that along the direction from the middle to both ends, the gradually decreasing distance between the sinking area 41c1 and the impeller 911 can make the air flow volume on both sides gradually increase to a certain extent, thereby further optimizing the distribution of the air flow along the extending direction of the volute tongue 40, making it more uniform and stable, improving the air - outlet reliability, and further reducing the overall noise, enhancing the user experience.

[0066] Define that the volute tongue 40 has a center line perpendicular to its own extending direction (left - right direction), and this center line extends along the front - back direction YY. During the operation of the indoor unit 1, the air flow distribution above the volute tongue 40 is generally symmetric about the above - mentioned center line left and right. In an embodiment, the sinking area 41c1 is symmetrically arranged about the above - mentioned center line, so as to conform to the air flow distribution near the volute tongue 40, achieve a symmetric flow - guiding effect, and can conform to the air flow, improve the guiding effect, and further reduce noise.

[0067] Please refer to in combination Figure 7 and Figure 8, to further improve the air flow noise, in some embodiments, the volute tongue 40 further includes a plurality of guide ribs 42. The guide ribs 42 are in the shape of long strips and are convexly provided on the outer surface of the volute tongue 40 at intervals along the axial direction of the impeller 911. The guide ribs 42 are formed by integral injection molding, or are fixed to the outer surface of the volute tongue 40 by means of bonding or snap connection. The adjacent two guide ribs 42 and the surface of the volute tongue 40 define a flow guide groove, which can play a role in combing and guiding the air flow. On the one hand, it can reduce the flow of the air flow in the axial direction, thereby reducing the pressure loss during the flow of the air flow to the air outlet 15. On the other hand, it can also separate the air flow with noise, so that the energy of the noise can be weakened. Through the effects of both aspects, the noise can be effectively reduced and the user experience can be improved.

[0068] Wherein, at least a part of the guide rib 42 is connected to the transition surface 41c for guiding the air flow above the transition surface 41c. Projecting along the axial direction of the impeller 911, the guide rib 42 has a guide rib 42 profile, and the guide rib 42 profile is parallel to the surface of the sinking area 41c1. That is to say, in the sinking area 41c1, the shapes of the upper surfaces of the plurality of guide ribs 42 are also sunken, so that the effect of reducing air flow impact and further reducing noise can also be achieved. It can be understood that the guide rib 42 can also extend to the air guiding surface 41b and the windward surface 41a, and the two ends of the guide rib 42 are smoothly connected to the air guiding surface 41b and the windward surface 41a to improve the air guiding effect and make the air flow transition smoothly.

[0069] Please refer to Figure 6 and Figure 9 , in some embodiments, the volute tongue 40 includes a volute tongue main body 41 and a support structure 45. The support structure 45 is connected to the end of the diffuser chamber lower shell 50 away from the water receiving tray 60 for providing support for the volute shell main body. The volute tongue main body 41 is arranged on the side of the support structure 45 away from the diffuser chamber lower shell 50 and has a windward surface 41a, a transition surface 41c and at least a part of an air guiding surface 41b for guiding the air flow. The upper surfaces of the volute tongue main body 41 and the support structure 45 are smoothly connected so that the air guiding surface 41b extends to the support structure 45 to make the air flow more smooth.

[0070] Furthermore, please refer to Figure 6 again. The volute tongue main body 41 and the support structure 45 also enclose a hollow cavity 16, which can save materials to a large extent and reduce costs while ensuring the structural strength.

[0071] In the embodiments of the present application, the volute tongue main body 41 and the support structure 45 can be processed and formed separately. Not only is the die design for the volute tongue main body 41 and the support structure 45 relatively simple respectively, thus reducing costs, but also the volute tongue main body 41 and the support structure 45 can be demolded separately, and the demolding operation is simple and the efficiency is higher. Among them, the volute tongue main body 41 and the support structure 45 can be detachably connected by means of snap fasteners or the like. In this way, different volute tongue main bodies 41 can be selected for matching according to specific actual usage situations. When replacement is needed, only the volute tongue main body 41 needs to be disassembled and assembled from the support structure 45, making the structure more flexible and improving the structural applicability; or when maintenance of the volute 40 is required, the maintenance personnel can also disassemble and assemble the volute tongue main body 41 from the support structure 45, improving the convenience of disassembly and maintenance.

[0072] In one embodiment, the diffuser chamber lower shell 50 and the support structure 45 can be an integral structure. In this way, the connection firmness between the diffuser chamber lower shell 50 and the support structure 45 can be improved, and the assembly steps of the diffuser chamber lower shell 50 and the support structure 45 can be reduced, improving the production efficiency. Of course, the two can also be a split structure and fixed by means of gluing, snap connection, etc., and the present application does not limit this. Further, the volute tongue main body 41 and the support structure 45 are an integral structure, which is beneficial to improving the structural integrity of the volute 40, reducing assembly gaps, and avoiding noise caused by air leakage. Furthermore, the volute 40 and the diffuser chamber lower shell 50 are an integral structure, which can be integrally injection molded, and the structural integrity of the second housing 30 is stronger and the processing efficiency is higher.

[0073] The above are the specific embodiments related to the volute 40. On this basis, the volute 40 can be applied to the air duct assembly 10 and the indoor unit 1 proposed in the present application. Since the air duct assembly 10 and the indoor unit 1 proposed in the implementation of the present application adopt all the technical solutions of all the above embodiments, they at least have all the beneficial effects brought by the technical solutions of the above embodiments, and will not be elaborated here one by one.

[0074] 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, they are 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.

[0075] 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 principles of the present application shall be included within the protection scope of the present application.

Claims

1. An indoor unit, characterized in that, Comprising: An impeller; And A volute tongue, disposed on one side of the impeller, the volute tongue having a windward surface, a wind guiding surface and a transition surface, the windward surface facing the impeller, the wind guiding surface being disposed at an angle to the windward surface and configured to guide the airflow flowing out of the impeller, and the transition surface connecting the windward surface and the wind guiding surface; Wherein, the transition surface has a sunken area, the sunken area being recessed towards the wind guiding surface to reduce the height of the sunken area relative to the impeller.

2. The indoor unit according to claim 1, characterized in that, Compared with the boundary line between the sunken area and the windward surface, the boundary line between the sunken area and the wind guiding surface is set further away from the impeller.

3. The indoor unit according to claim 1, characterized in that, The sunken area is an arc surface that arches towards the wind guiding surface.

4. The indoor unit according to claim 1, characterized in that The transition surface is further provided with a bulging area, the bulging area arching away from the wind guiding surface and being smoothly connected to the sunken area in a transitional manner.

5. The indoor unit according to claim 4, characterized in that, The volute tongue is arranged to extend along the axial direction of the impeller, the sunken area is arranged in the middle of the volute tongue and extends towards both ends of the volute tongue, and the bulging area is arranged at both ends of the sunken area along the extending direction of the volute tongue.

6. The indoor unit according to claim 5, characterized in that, The volute tongue has a width direction perpendicular to its own extending direction, and the width of the sunken area along the width direction gradually decreases from the middle of the volute tongue towards both ends of the volute tongue.

7. The indoor unit according to claim 5, characterized in that, In the direction from the middle of the volute tongue to both ends of the volute tongue, the distance between the sunken area and the impeller gradually decreases.

8. The indoor unit according to claim 5, characterized in that, The sunken area is symmetrically arranged with respect to the midline of the volute tongue perpendicular to its own extending direction.

9. The indoor unit according to any one of claims 1 to 8, characterized in that, The volute tongue further includes a plurality of flow guiding ribs, the plurality of flow guiding ribs being at least connected to the transition surface and arranged at intervals along the axial direction of the impeller; When projected along the axial direction of the impeller, the flow guiding ribs have a flow guiding rib profile, and the flow guiding rib profile is parallel to the surface of the sunken area.

10. The indoor unit according to any one of claims 1 to 8, characterized in that, The indoor unit includes: A first housing; A second housing, connected to the first housing and defining a blower cavity, a diffuser cavity and a heat exchange cavity that are sequentially communicated with the first housing, the impeller being disposed in the blower cavity, the volute tongue being disposed at the junction of the blower cavity and the diffuser cavity and configured to guide the airflow in the blower cavity to the diffuser cavity; and A heat exchanger, the heat exchanger being disposed in the heat exchange cavity.

11. The indoor unit according to claim 10, characterized in that, The second housing includes a diffuser cavity lower housing, and the first housing and the diffuser cavity lower housing define the diffuser cavity; The volute tongue includes a volute tongue body and a support structure, the support structure being connected to the side of the diffuser cavity lower housing close to the blower cavity, the volute tongue body being connected to the side of the support structure away from the diffuser cavity lower housing, and the windward surface, the transition surface and at least part of the wind guiding surface being disposed on the surface of the volute tongue body facing away from the support structure.

12. The indoor unit according to claim 11, characterized in that, The support structure and the diffuser cavity lower housing are an integral structure; And / or, the volute tongue body and the support structure are an integral structure.

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