Volute tongue, air duct assembly, indoor unit and heating and ventilation equipment

Abstract

The invention discloses a volute tongue, an air duct assembly, an indoor unit and heating and ventilation equipment, the volute tongue comprises a volute tongue main body and a plurality of flow guide ribs, the volute tongue main body is used for guiding air flow of an air inlet cavity to a diffusion cavity, and the main body surface of the volute tongue main body is constructed into a first windward section and a first air guide section which are adjacent in sequence; the contour line of the first windward section is connected with the molded line of the air inlet cavity, the contour line of the first air guide section is arranged in an arc shape, the cavity bottom wall of the diffusion cavity is constructed into a diffusion section, the molded line of the diffusion section is arranged in a straight line, and the end point of the arc-shaped contour line of the first air guide section and the starting point of the straight contour line of the diffusion section are overlapped. The multiple flow guide ribs are arranged on the main body face of the volute tongue body at intervals in a protruding mode in the length direction of the air duct assembly, each flow guide rib is constructed into a second windward section and a second air guide section, and the contour line end point of the second air guide section does not exceed the contour line starting point of the diffusion section. According to the technical scheme, noise generated by airflow blown out by the wind wheel can be reduced through the volute tongue.

Description

Technical Field

[0001] This application relates to the technical field of heating, ventilation and air conditioning (HVAC) equipment, and particularly to a scroll tongue, an air duct assembly, an indoor unit and HVAC equipment. Background Art

[0002] In an indoor unit of HVAC equipment, a scroll tongue is usually provided to guide the airflow generated by the impeller to the air outlet, and finally discharge it to indoor use scenarios. Therefore, the structure of the scroll tongue has a great influence on the noise reduction of the airflow generated by the impeller.

[0003] However, the existing structure of the scroll tongue has a poor noise reduction effect on the airflow blown by the impeller, resulting in a large amount of noise generated by the indoor unit and affecting the user experience. Summary of the Invention

[0004] Embodiments of this application provide a scroll tongue, an air duct assembly, an indoor unit and HVAC equipment, which can reduce the noise generated by the airflow blown by the impeller through the scroll tongue, achieving a good noise reduction effect.

[0005] In a first aspect, an embodiment of this application provides a scroll tongue located at the transition between the air inlet cavity and the diffuser cavity of the air duct assembly. The scroll tongue includes:

[0006] A scroll tongue main body for guiding the air flow in the air inlet cavity to the diffuser cavity. The main surface of the scroll tongue main body is configured to include a first windward section and a first air guiding section that are adjacent to each other in sequence. When projected along the length direction of the air duct assembly, the contour line of the first windward section is connected to the profile line of the air inlet cavity. The first air guiding section has a first arc contour line. The bottom wall of the diffuser cavity is configured as a diffuser section, and the profile line of the diffuser section is set as a straight line and has a first straight contour line. The first arc contour line overlaps with the starting point of the first straight contour line; and

[0007] A plurality of guide ribs protruding from the main surface of the scroll tongue main body at intervals along the length direction of the air duct assembly. Each guide rib is configured to include a second windward section and a second air guiding section. The second windward section is disposed on the first windward section, and the second air guiding section is disposed on the first air guiding section. When projected along the length direction of the air duct assembly, the end point of the contour line of the second air guiding section does not exceed the starting point of the first straight contour line.

[0008] In some embodiments, the first straight contour line is tangent to the first arc contour line.

[0009] In some embodiments, the second air guiding section has a second arc contour line and a second straight contour line. The first arc contour line and the second arc contour line are correspondingly arranged, and the second straight contour line extends from the end point of the second arc contour line and ends at the end point of the first arc contour line.

[0010] In some of these embodiments, both the first windward section and the first air guiding section are provided with an arc-shaped contour line. The normal vector direction of the arc apex of the first windward section is away from the air inlet cavity, and the normal vector direction of the arc apex of the first air guiding section is towards the air inlet cavity.

[0011] In some of these embodiments, the second windward section is provided with an arc-shaped contour line. The second air guiding section has a second arc-shaped contour line and a second straight-line contour line. The first arc-shaped contour line and the second arc-shaped contour line are correspondingly arranged. The first arc-shaped contour line corresponds to the second arc-shaped contour line. The second straight-line contour line starts from the end point of the second arc-shaped contour line and ends at the end point of the first arc-shaped contour line.

[0012] In some of these embodiments, an inner wall of the air inlet cavity is provided with a concave cavity, which is adjacent to the first windward section and located upstream of the first windward section.

[0013] In some of these embodiments, a flow guiding groove is jointly defined between two adjacent ones of the flow guiding ribs and the main body surface;

[0014] Wherein, when projected along the length direction of the air duct assembly, a part of the first windward section and the first air guiding section at the bottom of the flow guiding groove constitutes a bottom profile line, and the contour line end point of the second air guiding section intersects with the bottom profile line.

[0015] In some of these embodiments, the diffuser section is connected to the first air guiding section and forms an intersection line at the connection;

[0016] Wherein, the end point of the bottom profile line does not exceed the intersection line.

[0017] In some of these embodiments, the shape of the contour line of the flow guiding rib is configured to be wavy, broken line-shaped or a single arc-shaped bulging away from the volute tongue body.

[0018] In some of these embodiments, a plurality of the flow guiding ribs are all located on one side of the diffuser section.

[0019] In some of these embodiments, the connection between the end of the second air guiding section extending towards the diffuser section and the first air guiding section is in a smooth transition; and / or,

[0020] The connection between the end of the second windward section extending towards the air inlet cavity and the first windward section is in a smooth transition.

[0021] In a second aspect, an embodiment of the present application provides an air duct assembly, which includes a first housing and a second housing. The first housing and the second housing are cooperatively configured to define the air inlet cavity and the diffuser cavity;

[0022] Wherein, the second housing includes the volute tongue as described above.

[0023] In some embodiments, the second housing includes a first split structure and a second split structure. The first split structure is detachably connected to the second split structure, and the first split structure and the second split structure cooperate to configure the bottom wall of the diffuser chamber and part of the inner wall of the air inlet chamber.

[0024] Wherein, part of the second split structure configures the volute tongue.

[0025] In some embodiments, the first split structure includes:

[0026] A housing main body that cooperates with the second split structure to respectively configure the bottom wall of the diffuser chamber and part of the inner wall of the air inlet chamber; and

[0027] A support portion connected to one side of the housing main body and detachably connected to the second split structure.

[0028] In some embodiments, the second split structure includes a first plate segment, a second plate segment, and a third plate segment. The first plate segment configures the volute tongue, and the second plate segment and the third plate segment are connected to opposite ends of the first plate segment.

[0029] The support portion is provided with a first connection portion and a second connection portion. The first connection portion is disposed above the support portion, and the second connection portion is disposed below the support portion.

[0030] Wherein, the second plate segment is snap-connected to the first connection portion, and the third plate segment is snap-connected to the second connection portion.

[0031] In some embodiments, the housing main body and the support portion are an integral structure.

[0032] In some embodiments, a hollow cavity is formed by enclosing the second split structure and the support portion.

[0033] In a third aspect, an embodiment of the present application provides an indoor unit, which includes a fan and the air duct assembly as described above, and the fan is received in the air inlet chamber.

[0034] In a fourth aspect, an embodiment of the present application provides a heating, ventilation, and air conditioning (HVAC) device, which includes an outdoor unit and the indoor unit as described above, and the outdoor unit and the indoor unit form a refrigerant cycle.

[0035] Based on the volute tongue, air duct assembly, indoor unit, and heating, ventilation, and air conditioning (HVAC) equipment of the embodiments of the present application, by ensuring that the end point of the contour line of the second air guiding section does not exceed the starting point of the first straight contour line, the volute tongue of the present embodiment has two effects:

[0036] First, during the operation of the fan, the flow velocity of the blown air current is relatively fast, resulting in easy occurrence of noise. Based on this, in the present application, a plurality of flow guiding ribs are convexly arranged on the main body surface at intervals, so that when the air current blown by the fan flows through the volute tongue main body and is guided by the main body surface, a part of the air current flows between adjacent two flow guiding ribs. In this way, the air current with noise will be separated, so that the energy of the noise can be weakened, reducing the impact of the noise on the user and reducing the generation of noise, thereby improving the user experience. In addition, the plurality of flow guiding ribs are arranged at intervals along the length direction of the air duct assembly. In this way, under the guiding action of the plurality of flow guiding ribs, the flow of the air current in the length direction of the air duct assembly can be reduced, that is, the flow of the air current in the axial direction of the fan can be reduced, so as to reduce the energy loss of the air current during the flowing process to the air outlet;

[0037] Second, on the basis of the form that the end point of the contour line of the second air guiding section in the present embodiment does not exceed the starting point of the first straight contour line, compared with the form in which the end point of the contour line of the second air guiding section overlaps with the starting point of the contour line of the diffuser section, on the one hand, when the ends of the plurality of flow guiding ribs in the present embodiment do not extend to the diffuser section, the plurality of flow guiding ribs will not occupy the space of the diffuser cavity, so as to avoid the reduction of the space for the air current to flow through the diffuser cavity, and further avoid the reduction of the air volume of the air current flowing through the diffuser cavity, ensuring the air output volume; on the other hand, compared with the form in which the end point of the contour line of the second air guiding section of the flow guiding rib overlaps with the starting point of the contour line of the diffuser section, it can also reduce the extension length of each flow guiding rib, so as to reduce the material consumption of the flow guiding rib and reduce the production cost of the volute tongue. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] 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 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.

[0039] Figure 1 It is a schematic structural diagram of an embodiment of the indoor unit of the present application;

[0040] Figure 2 It is Figure 1 the exploded structural diagram of the indoor unit shown;

[0041] Figure 3 It is Figure 1Cross-sectional view taken along A-A as shown;

[0042] Figure 4 is Figure 3 Partial schematic diagram of the cross-sectional view shown;

[0043] Figure 5 is Figure 2 Partial structural schematic diagram of the second housing shown;

[0044] Figure 6 is Figure 5 Partial enlarged view at B in;

[0045] Figure 7 is Figure 2 Partial exploded structural schematic diagram of the second housing shown;

[0046] Figure 8 is Figure 2 Partial structural schematic diagram of the second housing from a top-down perspective shown.

[0047] Explanation of reference numerals in the drawings:

[0048] 1. Indoor unit; 10. Air duct assembly; 11. Air inlet cavity; 12. Diffuser cavity; 121. Diffuser section; 1211. First straight contour line; 13. Heat exchange cavity; 14. Air suction port; 15. Air outlet; 16. Hollow cavity; 17. Air duct air inlet interface; 18. Air duct air outlet interface; 20. First housing; 21. Upper shell of air inlet cavity; 22. Upper shell of diffuser cavity; 23. Upper shell of heat exchange cavity; 24. Upper heat insulation sponge; 25. Rear shell of air inlet cavity; 30. Second housing; 31. First split structure; 311. Housing body; 312. Support part; 3121. First connection part; 3122. Second connection part; 32. Second split structure; 321. First plate section; 322. Second plate section; 323. Third plate section; 33. Front shell of air inlet cavity; 40. Scroll tongue; 41. Scroll tongue body; 411. Main body surface; 412. First windward section; 413. First air guiding section; 414. First arc contour line; 42. Flow guiding rib; 423. Second windward section; 424. Second air guiding section; 425. Second arc contour line; 426. Second straight contour line; 43. Flow guiding groove; 431. Bottom line of groove; 45. Concave cavity; 46. Intersecting line; 50. Lower shell of diffuser cavity; 60. Water receiving tray; 70. Side panel; 80. Lower heat insulation sponge; 91. Fan; 92. Heat exchanger; 93. Electric control box assembly; 98. Grille.

[0049] The realization of the purpose, functional features and advantages of this application will be further described with reference to the embodiments and the accompanying drawings. Detailed implementation manners

[0050] To make the objectives, technical solutions, and advantages of this application more clear, the following will further describe the embodiments of this application in detail with reference to the accompanying drawings.

[0051] 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 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.

[0052] In the description of this 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 this application can be understood according to specific circumstances. In addition, in the description of this 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.

[0053] 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.

[0054] An indoor unit in a heating, ventilation, and air conditioning (HVAC) device usually has a volute tongue to guide the airflow generated by the impeller towards the air outlet, and finally discharge it to indoor usage scenarios and the like. Therefore, the structure of the volute tongue has a greater impact on the noise reduction of the airflow generated by the impeller.

[0055] However, the existing structure of the volute tongue has a poor noise reduction effect on the airflow generated by the impeller, resulting in a relatively large noise generated by the indoor unit and affecting the user experience.

[0056] To solve the above problems, please refer to Figure 1 , one aspect of this application proposes an HVAC device. In the embodiments of this application, the HVAC device includes an indoor unit 1, an air conditioner outdoor unit (not shown in the figure), and a connecting pipe (not shown in the figure). The indoor unit 1 is connected to the air conditioner outdoor unit through the connecting pipe to enable the circulation of refrigerant between the indoor unit 1 and the air conditioner indoor unit.

[0057] Please refer to Figures 1 to 3, the indoor unit 1 includes an air duct assembly 10, a fan 91, a heat exchanger 92, an electronic control box assembly 93, and a grille 98.

[0058] The air duct assembly 10 can be generally in a cuboid shape, having an up-down direction, a front-back direction, and a left-right direction, and the up-down direction, the front-back direction, and the left-right direction are pairwise arranged at an angle. The air duct assembly 10 is formed with a connected air inlet cavity 11, a diffuser cavity 12, and a heat exchange cavity 13. And the air duct assembly 10 is further formed with an air suction port 14 communicating with the air inlet cavity 11 and an air outlet 15 communicating with the heat exchange cavity 13.

[0059] Among them, the air inlet cavity 11 is configured to accommodate the fan 91, the heat exchange cavity 13 is configured to accommodate the heat exchanger 92, and the diffuser cavity 12 is used to diffuse the air flow blown from the air inlet cavity 11 to increase the pressure and flow rate of the air flow, so as to achieve a better cooling or heating effect. Thus, the external air flow can flow in from the air suction port 14, and after flowing through the fan 91 located in the air inlet cavity 11, the diffuser cavity 12, and the heat exchanger 92 located in the heat exchange cavity 13 in sequence, it flows out towards the air outlet 15.

[0060] Please refer to Figure 1 , in some embodiments, the indoor unit 1 can be a duct machine. The duct machine can have a duct air inlet interface 17 and a duct air outlet interface 18. The duct air inlet structure is defined between the rear side of the heat exchange cavity 13 and the rear side of the air inlet cavity 11. That is to say, the air suction port 14 falls within the width range of the duct air inlet interface 17. Thus, the air inlet duct docked with the duct machine can be docked to the duct air inlet interface 17, and the air outlet duct docked with the duct machine can be docked to the duct air outlet interface 18.

[0061] In some structural forms, the air suction port 14 can be directly opposite to the air inlet cavity 11 and located below the air inlet cavity 11. Thus, after the air flow enters the air suction port 14, it can flow towards the air inlet cavity 11 along a shorter path, reducing the loss of the air flow during the flowing process. And the air outlet 15 can be directly opposite to the heat exchange cavity 13 and located in front of the heat exchange cavity 13. Thus, after the air flow passes through the heat exchanger 92, it can flow towards the air outlet 15 along a shorter path, also being able to reduce the loss of the air flow during the flowing process.

[0062] The fan 91 can be in a long cylindrical shape, and its structural form can be a cross-flow fan, a centrifugal fan, or an axial flow fan, etc. When the fan 91 is configured as a cross-flow fan, the cross-flow fan has advantages such as a large air delivery volume, uniform air supply, and low noise, etc. And compared with a centrifugal fan, the cost of the cross-flow fan is lower. This application does not make a limitation in this regard. The fan 91 is accommodated in the air inlet cavity 11 to suck the air flow flowing in from the air suction port 14 and blow the air flow towards the diffuser cavity 12.

[0063] The heat exchanger 92 can be generally in a V-shaped configuration, and the heat exchanger 92 can be housed within the heat exchange chamber 13 and connected to the outdoor unit of the air conditioner via a connecting pipe so that refrigerant circulation can be achieved between the indoor unit 1 and the indoor unit of the air conditioner. The heat exchanger 92 can be used to perform heat exchange between hot air and the refrigerant so that the refrigerant can absorb heat, and thus the heat can be transferred to the refrigerant to achieve a refrigeration effect.

[0064] The electronic control box assembly 93 can be mounted on the surface of the air duct assembly 10 for installation and fixation. The electronic control box assembly 93 can be electrically connected to the fan 91 and the heat exchanger 92 respectively to control or regulate the fan 91 and the heat exchanger 92. For example, when the temperature in the environment where the indoor unit 1 is located reaches the set value, the electronic control box assembly 93 can send an instruction to turn off the fan 91 and the heat exchanger 92 to reduce energy consumption and prevent the indoor temperature from being too low or too high.

[0065] Please refer to Figures 1 to 3 , the air duct assembly 10 includes a first housing 20, a second housing 30, a grille 98, and a housing (not shown in the figure).

[0066] The first housing 20 and the second housing 30 can be made of metal materials such as aluminum alloy, stainless steel, or iron, etc. to meet requirements such as high strength and corrosion resistance. Of course, they can also be made of plastic materials to meet requirements such as light weight. This application does not limit this. For example, the first housing 20 can be made of metal material and the second housing 30 can be made of plastic material in a combination. It can be understood that the first housing 20 and the second housing 30 are combined and connected to configure the outline of the entire air duct assembly 10.

[0067] In some structural forms, the first housing 20 includes an upper housing and a side panel 70. Among them, the side panel 70 is connected between the upper housing and the first housing 20. Specifically, the upper housing and the second housing 30 can be arranged at intervals in the up-down direction, and the side panel 70 is connected between the upper housing and the second housing 30 to achieve the connection of the three.

[0068] Among them, the first housing 20 and the second housing 30 cooperate to define an air inlet chamber 11, a diffuser chamber 12, and a heat exchange chamber 13. The air suction port 14 can be formed by enclosing the first housing 20 and the second housing 30, and the air outlet 15 can be opened on the first housing 20. This application does not limit this.

[0069] Specifically, the first housing 20 and the second housing 30 can be fixedly connected by means such as threaded connection, snap connection, or welding. For example, they can be fixedly connected by threaded connection between the first housing 20 and the second housing 30. This connection method has a stable structure and good repeated disassembly and assembly performance. This application does not limit this.

[0070] The first housing 20 may include an air inlet cavity rear housing 25, an air inlet cavity upper housing 21, a diffuser cavity upper housing 22, and a heat exchange cavity upper housing 23 that are sequentially connected. Among them, the air inlet cavity rear housing 25, the air inlet cavity upper housing 21, and the second housing 30 cooperate to define an air inlet cavity 11. The diffuser cavity upper housing 22 and the second housing 30 cooperate to define a diffuser cavity 12. The heat exchange cavity upper housing 23 and the second housing 30 cooperate to define a heat exchange cavity 13. Further, the air inlet cavity rear housing 25, the air inlet cavity upper housing 21, the diffuser cavity upper housing 22, and the heat exchange cavity upper housing 23 may be of an integral structure to improve the overall connection firmness of the first housing 20 and reduce the assembly steps of the first housing 20.

[0071] The second housing 30 may include a volute tongue 40, an air inlet cavity front housing 33, a diffuser cavity lower housing 50, and a water receiving tray 60. Specifically, the air inlet cavity front housing 33, the air inlet cavity rear housing 25, and the air inlet cavity upper housing 21 cooperate to configure an air inlet cavity 11. The diffuser cavity lower housing 50 and the diffuser cavity upper housing 22 cooperate to define a diffuser cavity 12. The heat exchange cavity upper housing 23 and the water receiving tray 60 cooperate to define a heat exchange cavity 13. The volute tongue 40 is located at the transition between the air inlet cavity 11 and the diffuser cavity 12 of the air duct assembly 10.

[0072] Please refer to Figures 3 to 4 , further, the electronic control box assembly 93 may be installed on the surface of the diffuser cavity lower housing 50 that is opposite to the lower housing guide surface 511, and is adjacent to and facing the air suction port 14. In this way, maintenance personnel can directly disassemble and assemble the electronic control box assembly 93 at a position adjacent to the air suction port 14. Since there is no other structure blocking the area adjacent to the air suction port 14, when the maintenance personnel disassemble and assemble the electronic control box assembly 93, the operation is more convenient.

[0073] The first housing 20 further includes an upper heat insulation sponge 24. The upper heat insulation sponge 24 may be connected to one side of the upper shell of the heat exchanger 92 close to the heat exchanger 92. And the second housing 30 may further include a lower heat insulation sponge 80. The lower heat insulation sponge 80 may be connected to one side of the water receiving tray 60 facing away from the heat exchanger 92. In this way, through the upper heat insulation sponge 24 and the lower heat insulation sponge 80, it can play a role in maintaining the temperature inside the air duct assembly 10 to a certain extent, and reducing the probability of the energy inside the indoor unit 1 being dissipated outward through the first housing 20 and the second housing 30.

[0074] The grille 98 can be installed at the air inlet 14 to block external sundries, preventing external dust and sundries from entering the air inlet cavity 11 and the heat exchange cavity 13 and affecting the fan 91 and the heat exchanger 92. In this way, the service life of the indoor unit 1 can be extended. Moreover, when the air outlet 15 is located below the air inlet cavity 11, that is, the air outlet 15 is also below the fan 91, the grille 98 can prevent users or maintenance personnel from touching the fan 91, reducing the risk of users or maintenance personnel being injured by accidentally touching the blades of the fan 91.

[0075] The housing can be made of metal materials such as aluminum alloy, stainless steel or iron to meet requirements such as high strength and corrosion resistance. The housing can be configured to cover the outside of the first housing 20 and the second housing 30. In this way, it can protect the first housing 20, the second housing 30 and the electric control box assembly 93, and can also play a certain shielding role. For example, it can shield the electric control box assembly 93 to prevent users from directly observing the electric control box assembly 93, and to a certain extent, it can improve the external aesthetics. Of course, in other structural forms, the first housing 20 and the second housing 30 can act as the housing. In this way, the first housing 20 and the second housing 30 can directly replace the housing, reducing the number of structures of the air duct assembly 10 and shrinking the volume of the air duct assembly 10, realizing the miniaturization of the indoor unit 1 to adapt to more usage environments with relatively compact installation spaces.

[0076] In order to reduce the noise generated when the air flow passes through the volute tongue during the use of the indoor unit 1, please refer to Figures 3 to 4 In some embodiments, the volute tongue 40 can guide the air flow coming out of the fan 91 into the diffuser cavity 12, that is, it is used to guide the air flow in the air inlet cavity 11 into the diffuser cavity 12. The volute tongue 40 includes a volute tongue main body 41 and a guide rib 42.

[0077] The volute tongue main body 41 is the main structure of the volute tongue 40 and can be made of plastic material to be manufactured by injection molding. Of course, the volute tongue main body 41 can also be made of metal material, and this application does not limit this. The volute tongue main body 41 has a main surface 411. The main surface 411 of the volute tongue main body 41 is configured as a first windward section 412 and a first air guide section 413 that are adjacent to each other in sequence. When projected along the length direction of the air duct assembly 10, the contour line of the first windward section 412 is connected to the profile line of the air inlet cavity 10. The first air guide section 413 has a first arc contour line 414. The bottom wall of the diffuser cavity 12 is configured as a diffuser section 121. The profile line of the diffuser section 121 is set as a straight line and has a first straight contour line 1211. The first arc contour line 414 overlaps with the starting point of the first straight contour line 1211.

[0078] A plurality of flow guiding ribs 42 are protruded on the main surface (411) of the volute tongue main body 41 at intervals along the length direction of the air duct assembly 10. Each flow guiding rib 42 is configured into a second windward section 423 and a second air guiding section 424. The second windward section 424 is arranged on the first windward section 412, and the second air guiding section 424 is arranged on the first air guiding section 413. When projected along the length direction of the air duct assembly 10, the end point of the contour line of the second air guiding section 424 does not exceed the starting point of the first straight contour line 1211.

[0079] In summary, the volute tongue 40 of this embodiment has at least two aspects of effects:

[0080] First, during the operation of the fan 91, the flow velocity of the blown air flow is relatively fast, resulting in easy occurrence of noise. Based on this, in this application, a plurality of flow guiding ribs 42 are protruded on the main surface 411 at intervals, so that when the air flow blown by the fan 91 flows through the volute tongue main body 41 and is guided by the main surface 411, a part of the air flow flows between two adjacent flow guiding ribs 42. In this way, the noisy air flow will be separated, so that the energy of the noise can be weakened, the influence of the noise on the user can be reduced, and the generation of noise can be reduced, thereby improving the use experience. In addition, the plurality of flow guiding ribs 42 are arranged at intervals along the length direction of the air duct assembly 10. In this way, under the guiding action of the plurality of flow guiding ribs 42, the flow of the air flow in the length direction of the air duct assembly 10 can be reduced, that is, the flow of the air flow in the axial direction of the fan 91 can be reduced, so as to reduce the energy loss of the air flow during the flowing process to the air outlet 15;

[0081] Second, on the basis of the form that the end point of the contour line of the second air guiding section 424 of the flow guiding rib 42 in this embodiment does not exceed the starting point of the first straight contour line 1211, compared with the form in which the end point of the contour line of the second air guiding section 424 of the flow guiding rib 42 overlaps with the starting point of the contour line of the diffuser section 121, on the one hand, when the ends of the plurality of flow guiding ribs 42 in this embodiment do not extend to the diffuser section 121, the plurality of flow guiding ribs 42 will not occupy the space of the diffuser cavity 12, so as to avoid the reduction of the space for the air flow to flow through the diffuser cavity 12, and further avoid the reduction of the air volume of the air flow flowing through the diffuser cavity 12 and ensure the air output; on the other hand, compared with the form in which the end point of the contour line of the second air guiding section 424 of the flow guiding rib 42 overlaps with the starting point of the contour line of the diffuser section 121, the extension length of each flow guiding rib 42 can also be reduced, so as to reduce the material consumption of the flow guiding rib 42 and reduce the production cost of the volute tongue 40.

[0082] Please refer to Figure 4, in some embodiments, the first straight contour line 1211 is tangent to the first arc contour line 414. It can be understood that when the air flow passes through the main body surface 411, part of it will flow towards the diffuser section 121 under the guidance of the first air guiding section 413. If the first straight contour line 1211 is not tangent to the arc contour line of the first air guiding section 413, there will be a groove at the connection between the first straight contour line 1211 and the first arc contour line 414. Therefore, on the basis that the first straight contour line 1211 is tangent to the first arc contour line 414, it can ensure that the air flow guided by the first air guiding section 413 smoothly flows towards the diffuser section 121, thereby further reducing the noise generated when the air flow flows.

[0083] Please continue to refer to Figure 4 , further, the second air guiding section 424 has a second arc contour line 425 and a second straight contour line 426. The first arc contour line 414 and the second arc contour line 425 are correspondingly arranged. The second straight contour line 426 extends from the end point of the second arc contour line 425 and terminates at the end point of the first arc contour line 414.

[0084] In this way, the air flow will pass through the area of the second arc contour line 425 of the second air guiding section 424, and then pass through the area of the second straight contour line 426 of the second air guiding section 424. Based on the setting that the second straight contour line 426 terminates at the end point of the first arc contour line 414, when the air flow flows out of the second air guiding section 424, it will continue to flow through the area of the first arc contour line 414 of the first air guiding section 413 and finally flow towards the diffuser section 121. Thereby, it can ensure that the guide rib 42 does not occupy the space of the diffuser cavity 12, avoid the reduction of the air volume of the air flow passing through the diffuser cavity 12, ensure the air output volume, and reduce the extension length of each guide rib 42, thereby being able to reduce the material consumption of the guide rib 42 and reduce the production cost of the volute tongue 40.

[0085] Please refer to Figure 4 , in some embodiments, both the first windward section 412 and the first air guiding section 413 are arranged with arc contour lines. The normal vector direction of the arc vertex of the first windward section 412 is away from the air inlet cavity 11, and the normal vector direction of the arc vertex of the first air guiding section 413 is towards the air inlet cavity 11.

[0086] In this way, when the fan 91 operates, part of the air flow it sends out will flow towards the diffuser cavity 12 under the guidance of the first air guiding section 413, and part of it will return to the air inlet cavity 11 under the guidance of the first windward section 412. Thus, this part of the air flow can flow towards the fan 91 to play a role in stabilizing the eccentric vortex of the fan 91, and further can improve the air supply performance of the fan 91. On the basis that the air supply performance of the fan 91 is improved, the fan 91 can appropriately reduce its power when reaching the required air supply volume, thereby also reducing the noise generated when the fan 91 operates.

[0087] Please continue to refer to Figure 4 , further, the second windward section 423 is arranged with an arc contour line, the second air guiding section 424 has a second arc contour line 425 and a second straight contour line 426, the first arc contour line 414 and the second arc contour line 425 are correspondingly arranged, the first arc contour line 414 corresponds to the second arc contour line 425, the second straight contour line 1211 starts from the end point of the second arc contour line 425 and ends at the end point of the first arc contour line 414.

[0088] In this way, the air flow will pass through the area of the second arc contour line 425 of the second air guiding section 424, and then pass through the second straight contour line 426 of the second air guiding section 424. On the basis that the second straight contour line 426 of the second air guiding section 424 ends at the end point of the second arc contour line 425, when the air flow flows out of the second air guiding section 424, it will continue to flow through the area of the first arc contour line 414 of the first air guiding section 413, and finally flow to the diffuser section 121, so as to ensure that the guide rib 42 does not occupy the space of the diffuser cavity 12, avoid reducing the air volume of the air flow passing through the diffuser cavity 12, ensure the air output, and reduce the extension length of each guide rib 42, thereby reducing the material consumption of the guide rib 42 and reducing the production cost of the volute tongue 40.

[0089] Please refer to Figure 4 , in some embodiments, a concave cavity 45 is arranged on the inner wall of the air inlet cavity 11. The concave cavity 45 is adjacent to the first windward section 412 and is located upstream of the first windward section 412. In this way, the concave cavity 45 can separate the inner wall of the air inlet cavity 11 from the first windward section 412, so as to achieve the effect of reducing noise.

[0090] Please refer to in combination Figures 4 to 6 , in some embodiments, a flow guiding groove 43 is jointly defined between two adjacent guide ribs 42 and the main body surface 411. Among them, the cross-sectional shape of the flow guiding groove 43 can be trapezoidal, rectangular or triangular, etc. This embodiment does not limit this.

[0091] Projecting along the length direction of the air duct assembly 10, the part of the first windward section 412 and the first air guiding section 413 at the bottom of the flow guiding groove 43 constitutes a bottom profile line 431. The contour line end point of the second air guiding section 424 intersects with the bottom profile line 431, that is, the end of the bottom profile line 431 does not exceed the starting point of the first straight contour line 1211. In this way, the air flow blown by the fan 91 will flow to the first air guiding section 413 and then to the diffuser section 121 under the guidance of the flow guiding groove 43, so as to ensure that the guide rib 42 does not occupy the space of the diffuser cavity 12, avoid reducing the air volume of the air flow passing through the diffuser cavity 12, ensure the air output, and reduce the extension length of each guide rib 42, thereby reducing the material consumption of the guide rib 42 and reducing the production cost of the volute tongue 40.

[0092] Please continue to refer to Figures 4 to 6 Furthermore, the diffuser section 121 is connected to the first air guiding section 413 and an intersection line is formed at the connection. Among them, the end point of the groove bottom profile 431 does not exceed the intersection line. In this way, the air flow blown by the fan 91, under the guidance of the diversion groove 43, will not immediately flow to the diffuser section, but first flow to the first air guiding section 413 and then flow to the diffuser section 121. Thus, it can be ensured that the diversion ribs 42 do not occupy the space of the diffuser cavity 12, avoiding a reduction in the air volume of the air flow passing through the diffuser cavity 12, ensuring the air output, and reducing the extension length of each diversion rib 42, thereby being able to reduce the material usage of the diversion ribs 42 and lower the production cost of the volute tongue 40.

[0093] Please refer to Figures 6 to 7 In some embodiments, the shape of the contour line 423 of the diversion rib is configured as a wavy shape. When the diversion rib profile 423 is configured as a wavy shape, it can be a three - segment shape connected in sequence. The first segment is an arc - shaped concave towards the volute tongue body 41, the second segment is an arc - shaped convex away from the volute tongue body 41, and the third segment is an arc - shaped concave towards the volute tongue body 41. It can be understood that the first segment is closer to the diffuser section 121 than the third segment, and the curvature of the second segment is greater than that of the first segment. In this way, the first segment will be smoother, so that when the air flow passes through the diversion rib 42, the air resistance can be reduced, the loss of the air flow can be reduced, and the air supply capacity can be enhanced.

[0094] In some embodiments, the shape of the contour line 423 of the diversion rib is configured as a broken - line shape. When the diversion rib profile 423 is configured as a broken - line shape, it can be a two - segment shape connected. The first segment is connected to the lower part of the volute tongue body 41, extends away from the volute tongue body 41 and is connected to the second segment, and the second segment extends towards the volute tongue body 41 and intersects with the groove bottom profile 431.

[0095] In some embodiments, the shape of the contour line 423 of the diversion rib is configured as a single arc - shaped convex away from the volute tongue body 41. When the diversion rib profile 423 is configured as a single arc - shaped convex away from the volute tongue body 41, when the air flow passes through the diversion rib 42, the resistance encountered during the flow process is less, the air resistance can be reduced, the loss of the air flow can be reduced, and the air supply capacity can be enhanced.

[0096] In some embodiments, multiple diversion ribs 42 are all located on one side of the diffuser section 121. It can be understood that multiple diversion ribs 42 can be located on the lower side of the diffuser section 121 in both the up - and - down directions. In this way, under the guidance of the diversion ribs 42, the air flow will flow upward and towards the diffuser section 121 at this time.

[0097] Of course, in other structural forms, multiple flow guiding ribs 42 may also be located on the upper side of the diffuser section 121 in the up and down directions, and the present application does not limit this.

[0098] Please refer to Figures 7 to 8 , in some embodiments, the connection between the end of the second air guiding section 424 extending towards the diffuser section 121 and the first air guiding section 413 is in a smooth transition. In this way, when the air flow passes through the connection between the end of the second air guiding section 424 and the first air guiding section 413, the air resistance is small, the flow is relatively smooth, and noise generation is avoided.

[0099] Alternatively, the connection between the end of the second windward section 423 extending towards the air inlet cavity 11 and the first windward section 412 is in a smooth transition. In this way, when the air flow passes through the connection between the end of the second windward section 423 extending towards the air inlet cavity 11 and the second air guiding section 424, the air resistance is small, the flow is relatively smooth, and noise generation is avoided.

[0100] Alternatively, the connection between the end of the second air guiding section 424 extending towards the diffuser section 121 and the first air guiding section 413 is in a smooth transition, and the connection between the end of the second windward section 423 extending towards the air inlet cavity 11 and the first windward section 412 is in a smooth transition. In this way, when the air flow passes through the connection between the end of the second air guiding section 424 and the first air guiding section 413, the air resistance is small, the flow is relatively smooth, and noise generation is avoided. And when the air flow passes through the connection between the end of the second windward section 423 extending towards the air inlet cavity 11 and the second air guiding section 424, the air resistance is small, the flow is relatively smooth, and noise generation is avoided.

[0101] Please refer to Figure 7 , in some embodiments, the second housing 30 includes a first split structure 31 and a second split structure 32. The first split structure 31 and the second split structure 32 are detachably connected, and the first split structure 31 and the second split structure 32 cooperate to configure the bottom wall of the diffuser cavity 12 and part of the inner wall of the air inlet cavity 11. Among them, part of the second split structure 31 configures the volute tongue 40.

[0102] It can be understood that a water receiving tray 60 is configured on the first split structure 31, and the first split structure 31 and the second split structure 32 cooperate to configure the lower shell 50 of the diffuser cavity and the front shell 33 of the air inlet cavity. The second split structure 32 configures the volute tongue 40. In this way, when it is necessary to perform separate maintenance on the first split structure 31 or the second split structure 32, the two can be disassembled for easy maintenance.

[0103] Please continue to refer to Figure 7, Further, the first split structure 31 includes a housing main body 311 and a support portion 312. The housing main body 311 and the second split structure 32 respectively cooperate to configure the bottom wall of the diffuser chamber 12 and a part of the inner wall of the air inlet chamber 11. The support portion 312 is connected to one side of the housing main body 311 and is detachably connected to the second split structure 32. In this way, according to the different air outlet conditions of the specific fan 91, a suitable volute tongue 40 can be selected for matching. When replacement is needed, only the second split structure 32 needs to be disassembled and assembled from the support portion 312. Or when the volute tongue 40 needs to be maintained, the maintenance personnel can also disassemble and assemble the second split structure 32 from the support portion 312. Among them, the specific detachable connection form can be snap connection, threaded connection or bonding, etc., and the present application does not limit this.

[0104] Further, the housing main body 311 and the support portion 312 can be an integral structure. In this way, the connection firmness between the housing main body 311 and the support portion 312 can be improved, and the assembly steps of the housing main body 311 and the support portion 312 can be reduced, improving production efficiency. Of course, the two can also be split structures and fixed by means such as gluing and snap connection, and the present application does not limit this.

[0105] Please refer to Figure 7 , In some embodiments, the second split structure 32 includes a first plate segment 321, a second plate segment 322 and a third plate segment 323. The first plate segment 321 configures the volute tongue 40. The second plate segment 322 and the third plate segment 323 are connected to opposite ends of the first plate segment 321. Among them, the second plate segment 322 and the housing main body 311 of the first split structure 31 cooperate to configure the bottom wall of the diffuser chamber 12, and the third plate segment 323 and the housing main body 311 of the first split structure 31 cooperate to configure a part of the inner wall of the air inlet chamber 11.

[0106] The support portion 52 is provided with a first connection portion 3121 and a second connection portion 522. The first connection portion 3121 is arranged above the support portion 52, and the second connection portion 522 is arranged below the support portion 52. Among them, the second plate segment 322 is snap-connected to the first connection portion 3121, and the third plate segment 323 is snap-connected to the second connection portion 522.

[0107] The first plate segment 321, the second plate segment 322 and the third plate segment 323 are connected in a head-to-tail and sequentially connected form, and the three can be an integral structure, making their connection more firm and reducing the assembly steps. Of course, they can also be split structures and fixed by means such as threaded connection, snap connection or bonding, and the present application does not limit this.

[0108] Specifically, the first connecting portion 3121 can be a first buckle, and a buckle hole for the first buckle to be buckled is formed on the second plate segment 322, so as to realize the buckle connection between the second plate segment 322 and the first connecting portion 3121; further, the first buckle can be trapezoidal, that is, the side surface of the first buckle will form a guiding surface, so as to cooperate with the hole side wall of the buckle hole when the first buckle penetrates the buckle hole, facilitating assembly.

[0109] The second connecting portion 3122 can be a second buckle, and a third buckle is arranged on the third plate segment 323. A buckling space is formed by surrounding the second buckle, so that when the third buckle overlaps on the second buckle, it can be buckled in the buckling space. In this way, in the up-and-down direction, there are at least two buckle connection points between the support portion 52 and the second split structure 32, so that the connection between the support portion 52 and the second split structure 32 is more stable, and the disassembly and assembly operations are more convenient and fast.

[0110] Please refer to Figure 4 , further, a lapping step is formed by the support portion 52 recessing in a direction away from the second split structure 32. The first connecting portion 3121 is arranged on the lapping step. The second plate segment 322 can lap on the lapping step and be buckled with the first connecting portion 3121. In this way, compared with the lapping step, the second plate segment 322 is closer to the diffuser chamber upper shell 22, so that the air flow blown by the fan 91 will not flow to the lapping step, avoiding that in the long-term use, the support portion 52 is warped in the direction towards the diffuser chamber upper shell 22 under the long-term blowing of the air flow, which will cause the air flow to be blocked by the warped support portion 52 and consume the air flow energy. The setting of the lapping step in this embodiment makes the lapping portion of the second plate segment 322 and the lapping step deviate from the flowing direction of the air flow. In this way, even in the long-term use, the air flow will not blow the second plate segment 322 to be warped, and the possibility of consuming the air flow energy can be reduced.

[0111] Please continue to refer to Figure 4, in some embodiments, a hollow cavity 16 is formed by enclosing the second split structure and the support portion 52. It can be understood that the hollow cavity 16 may include a first half cavity and a second half cavity. The first half cavity is enclosed by the inner wall surface of the second split structure 32 being recessed, and the second half cavity is enclosed by the outer wall surface of the support portion 52 being recessed, thereby enclosing the hollow cavity 16; of course, it may also be that the hollow cavity 16 is enclosed solely by the inner wall surface of the second split structure 32 being recessed, or the hollow cavity 16 is enclosed by the outer wall surface of the support portion 52 being recessed. The present application does not limit this. In this way, compared with the form in which the second split structure 32 and the support portion 52 are non-hollow, this embodiment can reduce the materials of the volute tongue body 41 and the support portion 52, reduce the cost of the second housing 30, and can reduce the weight of the second housing 30, so that the overall weight of the indoor unit 1 is reduced.

[0112] 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 this patent. For those of ordinary skill in the art, the specific meanings of the above terms can be understood according to specific circumstances.

[0113] The above is only a preferred embodiment of the present application and is not intended to limit the present application. Any modifications, equivalent replacements, and improvements made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. A volute tongue is located at the transition between the air inlet cavity and the diffuser cavity of the air duct assembly, and is characterized in that, Comprising: A volute tongue body for guiding the air flow in the air inlet cavity to the diffuser cavity. The main surface of the volute tongue body is configured as a first windward section and a first air guiding section adjacent to each other in sequence. When projected along the length direction of the air duct assembly, the contour line of the first windward section is connected to the profile line of the air inlet cavity. The first air guiding section has a first arc contour line. The bottom wall of the diffuser cavity is configured as a diffuser section. The profile line of the diffuser section is set as a straight line and has a first straight contour line. The starting point of the first arc contour line overlaps with the starting point of the first straight contour line; And A plurality of guide ribs protruding from the main surface of the volute tongue body at intervals along the length direction of the air duct assembly. Each guide rib is configured as a second windward section and a second air guiding section. The second windward section is arranged on the first windward section, and the second air guiding section is arranged on the first air guiding section. When projected along the length direction of the air duct assembly, the end point of the contour line of the second air guiding section does not exceed the starting point of the first straight contour line.

2. The scroll tongue according to claim 1, characterized in that, The first straight contour line is tangent to the first arc contour line.

3. The scroll tongue according to claim 2, characterized in that, The second air guiding section has a second arc contour line and a second straight contour line. The first arc contour line and the second arc contour line are correspondingly arranged. The second straight contour line extends from the end point of the second arc contour line and ends at the end point of the first arc contour line.

4. The scroll tongue according to claim 1, characterized in that, Both the first windward section and the first air guiding section are arranged with arc contour lines. The normal vector direction of the arc vertex of the first windward section is away from the air inlet cavity, and the normal vector direction of the arc vertex of the first air guiding section is towards the air inlet cavity.

5. The scroll tongue according to claim 4, wherein The second windward section is arranged with an arc contour line. The second air guiding section has a second arc contour line and a second straight contour line. The first arc contour line and the second arc contour line are correspondingly arranged. The first arc contour line corresponds to the second arc contour line. The second straight contour line starts from the end point of the second arc contour line and ends at the end point of the first arc contour line.

6. The scroll tongue according to claim 1, wherein A concave cavity is arranged on the inner wall of the air inlet cavity. The concave cavity is adjacent to the first windward section and is located upstream of the first windward section.

7. The scroll tongue according to claim 1, characterized in that, A flow guiding groove is jointly defined between two adjacent guide ribs and the main surface; Wherein, when projected along the length direction of the air duct assembly, the part of the first windward section and the first air guiding section at the bottom of the flow guiding groove constitutes the bottom profile line of the groove, and the end point of the contour line of the second air guiding section intersects with the bottom profile line of the groove.

8. The volute tongue according to claim 7, wherein The diffuser section is connected to the first air guiding section and forms an intersection line at the connection; Wherein, the end point of the bottom profile line of the groove does not exceed the intersection line.

9. The volute tongue according to claim 1, wherein The shape of the contour line of the guide rib is configured as a wavy shape, a broken line shape or a single arc shape bulging away from the volute tongue body.

10. The scroll tongue according to claim 1, characterized in that, A plurality of the guide ribs are all located on one side of the diffuser section.

11. The scroll tongue according to any one of claims 1-10, characterized in that, The connection between the end of the second air guiding section extending towards the diffuser section and the first air guiding section is in a smooth transition; and / or, The connection between the end of the second windward section extending towards the air inlet cavity and the first windward section is in a smooth transition.

12. An air duct assembly, characterized in that, It includes a first housing and a second housing, and the first housing and the second housing are cooperatively configured to form the air inlet chamber and the diffuser chamber; Wherein, the second housing includes a volute tongue as described in any one of claims 1-11.

13. The air duct assembly according to claim 12, characterized in that, The second housing includes a first split structure and a second split structure, the first split structure and the second split structure are detachably connected, and the first split structure and the second split structure are cooperatively configured to form the bottom wall of the diffuser chamber and a part of the inner wall of the air inlet chamber; Wherein, a part of the second split structure is configured to form the volute tongue.

14. The air duct assembly according to claim 13, wherein The first split structure includes: A housing main body, which cooperates with the second split structure to form the bottom wall of the diffuser chamber and a part of the inner wall of the air inlet chamber respectively; and A support portion, connected to one side of the housing main body and detachably connected to the second split structure.

15. The air duct assembly according to claim 14, wherein, The second split structure includes a first plate segment, a second plate segment and a third plate segment. The first plate segment is configured to form the volute tongue, and the second plate segment and the third plate segment are connected to opposite ends of the first plate segment; The support portion is provided with a first connecting portion and a second connecting portion. The first connecting portion is arranged above the support portion, and the second connecting portion is arranged below the support portion; Wherein, the second plate segment is snap-connected to the first connecting portion, and the third plate segment is snap-connected to the second connecting portion.

16. The air duct assembly according to claim 14, wherein, The housing main body and the support portion are of an integral structure.

17. The air duct assembly according to claim 14, wherein A hollow cavity is formed by enclosing the second split structure and the support portion.

18. An indoor unit, characterized in that, It includes a fan and an air duct assembly as described in any one of claims 12 to 17, and the fan is received in the air inlet chamber.

19. A heating, ventilation and air conditioning (HVAC) device, characterized in that, It includes an outdoor unit and an indoor unit as described in claim 18, and the outdoor unit and the indoor unit form a refrigerant cycle.

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