Air conditioner and volute tongue device thereof

Abstract

The utility model provides an air conditioner and a volute tongue device thereof. The volute tongue device comprises a body and comb teeth. The body extends in the axial direction of a wind wheel of the air conditioner and is arranged on the front side of the wind wheel at intervals. The comb teeth extend out of the side, facing the wind wheel, of the body. The multiple comb teeth are sequentially arranged at intervals in the length direction of the body. Wherein the heights of any two adjacent comb teeth are different. According to the volute tongue device, vibration waveforms generated at the volute tongue device can be prevented from being overlapped, so that turbulent flow is reduced, and noise is lowered.

Description

Technical Field

[0001] The utility model relates to the technical field of air conditioning, in particular to an air conditioner and a volute device thereof. Background Art

[0002] Centrifugal and cross-flow air conditioners typically feature a volute and tongue at the outlet of the impeller to divert and expand the outgoing airflow. During operation, the impeller blades fan the air across the tongue at a high frequency, generating significant turbulence and noise at the tongue, impacting the user experience. Utility Model Content

[0003] In view of the above problems, the present invention is proposed to provide an air conditioner and its volute device that overcome the above problems or at least partially solve the above problems, aiming to solve the problem that the volute of the existing air conditioner generates large turbulence and noise.

[0004] Specifically, the present invention provides the following technical solutions:

[0005] A volute tongue device for an air conditioner comprises a body and comb teeth.

[0006] The body is configured to extend along the axial direction of the air conditioner's impeller and is spaced apart in front of the impeller. The comb teeth extend from a side of the body facing the impeller. There are a plurality of comb teeth, which are spaced apart in sequence along the length direction of the body.

[0007] Wherein, the heights of any two adjacent comb teeth are different.

[0008] Optionally, the height difference between any two of the comb teeth is 1-10 mm.

[0009] Optionally, the side of the body facing the wind wheel is a first plane. In the longitudinal section of the volute tongue device, the top end of any comb tooth is a curved segment.

[0010] Optionally, in the longitudinal section of the volute tongue device, the top end of any comb tooth is a straight line segment, and is an oblique line segment relative to the first plane.

[0011] Optionally, in the longitudinal section of the volute tongue device, the distance between any point on the top end of the same comb tooth and the first plane is not equal.

[0012] Optionally, the side of the body facing the wind wheel is a first plane. In the longitudinal section of the volute tongue device, the top of any comb tooth is a sine curve segment, and the tops of all the comb teeth are on the same sine curve.

[0013] Optionally, the wavelength of the sine curve is 4-20 times the height difference between the crest and the trough.

[0014] Optionally, the comb teeth are evenly spaced along the length of the body, the thickness of the comb teeth is 1-5 mm, and the distance between two adjacent comb teeth is less than or equal to the thickness of the comb teeth.

[0015] At least five comb teeth are arranged in each period of the sine curve.

[0016] Optionally, the two comb teeth at both ends of the body in the length direction are both located at the peaks of the sine curve.

[0017] Optionally, a side of the body facing the wind wheel is a first plane. On the projection of the first plane, an air guide groove is formed between two adjacent comb teeth.

[0018] The air guide groove includes a return air groove and an outlet air groove connected to each other, the outlet air groove is close to the air duct outlet of the air conditioner, the return air groove forms a first gradually expanding opening away from the outlet air groove, and the outlet air groove forms a second gradually expanding opening away from the return air groove.

[0019] Optionally, the second expansion angle of the second gradually expanding opening is 0.4-3 degrees. The first expansion angle of the first gradually expanding opening is greater than or equal to the second expansion angle.

[0020] On the other hand, the present application also provides an air conditioner, comprising an air duct and a wind wheel in the air duct, wherein the air duct comprises a volute at the outlet side of the wind wheel and the above-mentioned volute tongue device.

[0021] The utility model relates to a volute device for an air conditioner. A plurality of comb teeth are arranged at intervals on the main body, so that a concave-convex structure is formed on the windward surface of the volute device facing the wind wheel, wherein the comb teeth are convex structures and the air guide grooves formed between adjacent comb teeth are concave structures. This makes the distance between the blades of the wind wheel and the top of the comb teeth smaller than the distance between the blades of the wind wheel and the bottom of the air guide groove. The airflow fanned by the blades of the wind wheel will reach the top of the comb teeth and the bottom of the air guide groove at staggered times, forming discrete vibration waveforms at the top of the comb teeth and the bottom of the air guide groove, which can reduce the superposition of vibration waveforms, thereby reducing turbulence and reducing noise. Furthermore, the heights of two adjacent comb teeth are different, so that the distances between the blades of the wind wheel and the top of adjacent comb teeth are also different. The airflow fanned by the blades of the wind wheel will reach the top of the comb teeth at staggered times, staggering the phases of the vibration waveforms at the top of adjacent comb teeth, preventing the vibration waveforms at the top of the comb teeth from superposition, further reducing turbulence and reducing noise.

[0022] Based on the following detailed description of specific embodiments of the present invention in conjunction with the accompanying drawings, those skilled in the art will become more aware of the above and other objects, advantages and features of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Hereinafter, some specific embodiments of the present invention will be described in detail in an exemplary and non-limiting manner with reference to the accompanying drawings. The same reference numerals in the accompanying drawings indicate the same or similar components or parts. It should be understood by those skilled in the art that these drawings are not necessarily drawn to scale. In the accompanying drawings:

[0024] Figure 1 is a schematic structural diagram of a volute tongue device according to one embodiment of the present utility model;

[0025] Figure 2 is a schematic front view of a volute tongue device according to one embodiment of the present utility model;

[0026] Figure 3 is a schematic bottom view of a volute tongue device according to one embodiment of the present invention;

[0027] Figure 4 yes Figure 2 Schematic cross-sectional view along the EE axis;

[0028] Figure 5 yes Figure 4 Schematic longitudinal section along the AA axis (rotated 90 degrees);

[0029] Figure 6 yes Figure 4 Schematic longitudinal section along the BB axis (rotated 90 degrees);

[0030] Figure 7 yes Figure 4 Schematic longitudinal section along the CC axis (rotated 90 degrees);

[0031] Figure 8 yes Figure 4 Schematic cross-section along the DD axis;

[0032] Figure 9 This is a schematic cross-sectional view of an air conditioner according to an embodiment of the present invention, perpendicular to the axis of the wind wheel.

[0033] List of reference numerals:

[0034] 100. Volute tongue device; 110. Main body; 111. First plane; 120. Comb teeth; 121. Top end; 130. Air guide slot; 131. Return air slot; 132. Air outlet slot; 133. First gradually expanding opening; 134. Second gradually expanding opening; 200. Air duct; 210. Air duct outlet; 300. Wind wheel; 310. Axis; 400. Volute. DETAILED DESCRIPTION

[0035] Refer to the following Figures 1 to 9To describe the air conditioner and its volute device in accordance with an embodiment of the present invention. In the description of this embodiment, it should be understood that the terms "first" and "second" are used for descriptive purposes only and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features, that is, include one or more of the features. In the description of the present invention, the meaning of "plurality" is at least two, such as two, three, etc., unless otherwise clearly and specifically defined. When a feature "includes or contains" one or some of the features it covers, unless otherwise specifically described, this indicates that other features are not excluded and may further include other features.

[0036] Unless otherwise expressly specified or limited, terms such as "disposed," "installed," "connected," "connected," "fixed," and "coupled" should be interpreted broadly. For example, they may refer to fixed or detachable connections, or integration; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two elements or interaction between two elements, unless otherwise expressly limited. A person of ordinary skill in the art should be able to understand the specific meanings of the above terms in this utility model based on the specific circumstances.

[0037] In addition, in the description of this embodiment, the first feature being "above" or "below" the second feature may include the first and second features being in direct contact, or may include the first and second features not being in direct contact but being in contact via another feature between them. That is, in the description of this embodiment, the first feature being "above," "above," and "above" the second feature includes the first feature being directly above or diagonally above the second feature, or simply indicates that the first feature is higher in level than the second feature. The first feature being "below," "below," or "below" the second feature may mean that the first feature is directly below or diagonally below the second feature, or simply indicates that the first feature is lower in level than the second feature.

[0038] In the description of the present embodiment, reference to the terms "one embodiment," "some embodiments," "illustrative embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials, or characteristics described may be combined in any appropriate manner in any one or more embodiments or examples.

[0039] Figure 1 A schematic structural diagram of a volute tongue device according to an embodiment of the present invention is shown in FIG. Figure 1 As shown, and reference Figure 2-9 The embodiment of the utility model provides a volute tongue device 100 of an air conditioner, including a body 110 and comb teeth 120.

[0040] The main body 110 is configured to extend axially along the air conditioner's impeller 300 and is spaced apart in front of the impeller 300. Comb teeth 120 extend from the side of the main body 110 facing the impeller 300. There are multiple comb teeth 120, spaced apart along the length of the main body 110. The height H1 of any two adjacent comb teeth 120 is different.

[0041] Both centrifugal and cross-flow air conditioners are equipped with an air duct 200 and a wind wheel 300 located within the air duct 200. The air duct 200 forms a volute 400 and a volute tongue device 100 on the outlet side of the wind wheel 300. The volute 400 and the volute tongue device 100 are spaced apart and arranged opposite to each other. The wind wheel 300 fannes the airflow to impact the volute tongue device 100, generating significant turbulence and noise at the volute tongue device 100.

[0042] The body 110 forms the skeleton of the volute tongue device 100. The body 110 and the comb teeth 120 can be processed by an integral injection molding process. The length direction of the body 110 is parallel to the axis 310 of the wind wheel 300. The body 110 can be L-shaped as a whole, and can include a windward plate facing the wind wheel 300 and a diffuser plate facing the air duct outlet 210. The junction of the windward plate and the diffuser plate can be provided with an excessive fillet to reduce turbulence and reduce wind loss. The excessive fillet is usually toward the edge of the wind wheel 300, such as Figure 9 As shown, the AA axis is the main flow direction of the airflow fanned by the wind wheel 300, and the AA axis passes through the center of the excessively rounded corner.

[0043] In this embodiment, the comb teeth 120 may protrude vertically outward from the side of the body 110 facing the wind rotor 300 (or may protrude outward at a slightly inclined angle), and air guide grooves 130 are formed between adjacent comb teeth 120. In other words, a concave-convex structure is formed on the windward surface of the volute tongue device 100 facing the wind rotor 300, wherein the comb teeth 120 are convex, and the air guide grooves 130 formed between adjacent comb teeth 120 are concave. This ensures that the distance between the wind rotor 300 and the top 121 of the comb teeth 120 is smaller than the distance between the wind rotor 300 and the bottom of the air guide grooves 130. The airflow fanned by the wind rotor 300 arrives at the top 121 of the comb teeth 120 and the bottom of the air guide grooves 130 at staggered times, forming discrete vibration waveforms at the top 121 of the comb teeth 120 and the bottom of the air guide grooves 130. This reduces the superposition of vibration waveforms, thereby reducing turbulence and lowering noise.

[0044] Since the extension direction of the comb teeth 120 and the air guide groove 130 is consistent with the flow direction of the airflow, the air guide groove 130 can also rectify the airflow while reducing wind resistance, thereby reducing turbulence and reducing noise.

[0045] In this embodiment, the heights H1 of two adjacent comb teeth 120 are different. When the top 121 of the comb teeth 120 is pointed, or the top 121 of the comb teeth 120 is flat and parallel to the surface of the body 110 facing the wind rotor 300, the height of the comb teeth 120 is the distance from the top 121 to the surface of the body 110 facing the wind rotor 300. When the top 121 of the comb teeth 120 is not parallel to the surface of the body 110 facing the wind rotor 300, or the top 121 of the comb teeth 120 is an inclined or curved surface, as shown in FIG. Figure 6 As shown, the height H1 of the comb teeth 120 is the maximum distance from the top end 121 to the surface of the body 110 facing the wind wheel 300 .

[0046] In this embodiment, the heights of two adjacent comb teeth 120 are different, so that the distances between the wind wheel 300 and the top ends 121 of adjacent comb teeth 120 are also different. The airflow fanned by the wind wheel 300 will reach the top ends 121 of the comb teeth 120 at staggered times, staggering the phases of the vibration waveforms of the top ends 121 of adjacent comb teeth 120 (specifically, the phases of the vibration waveforms of the comb teeth 120 with relatively low height H1 can be delayed), preventing the vibration waveforms of the top ends 121 of adjacent comb teeth 120 from overlapping, further reducing turbulence and reducing noise.

[0047] It should be noted that the air conditioner, air duct, wind wheel, etc. involved in this embodiment are all characteristics of the use environment. The volute tongue device can be produced and sold independently.

[0048] In some embodiments of the volute tongue device of the present invention, as Figure 6 As shown, the height difference between any two comb teeth 120 is 1-10 mm.

[0049] The height difference of the comb teeth 120 is expressed as the distance between the windward surface of the volute tongue device 100 and the blades of the wind rotor 300. If the height difference is too large, the top 121 of the comb teeth 120 with the lower height may be too far away from the wind rotor 300, causing air leakage and affecting the air output of the wind rotor 300. If the height difference is too small, the effect on the amplitude of the phase of the vibration waveform of the top 121 of adjacent comb teeth 120 is not obvious. The setting of this height difference is also related to the diameter of the wind rotor 300, the number of blades in the wind rotor 300, the rotation speed of the wind rotor 300, etc. 1-10mm is an optimal range that takes into account all the above factors.

[0050] In some embodiments of the volute tongue device of the present invention, the height difference between any two comb teeth 120 is 2-6 mm, which can achieve a good balance between reducing air leakage and reducing turbulence.

[0051] In some embodiments of the volute tongue device of the present invention, as Figure 5-7 As shown, the side of the body 110 facing the wind wheel 300 is a first plane 111. In the longitudinal section of the volute tongue device 100, the top 121 of each comb tooth 120 is a curved segment. Figure 5 The middle AA axis is the main flow direction of the wind wheel 300. Figure 6 The middle BB axis is a line perpendicular to the first plane 111 from the highest point of the top 121 of the comb teeth 120 to the first plane 111. Figure 7 The central CC axis is a vertical line between the top end 121 of the middle portion of the comb teeth 120 and the first plane 111 .

[0052] The curve segment may be a sine curve segment, a cubic function curve segment, a quintic function curve segment, etc. In this embodiment, the top ends 121 of the comb teeth 120 are all curved surfaces. That is, adjacent points on the top end 121 of the same comb tooth 120 have different distances from the blades of the wind wheel 300. This allows the airflow fanned by the blades of the wind wheel 300 to reach the points on the curved surface where the top ends 121 of the comb teeth 120 are located at staggered times, staggering the phases of the vibration waveforms at adjacent points on the top ends 121 of the comb teeth 120. This prevents the vibration waveforms at the top ends 121 of the same comb teeth 120 from overlapping, thereby further reducing turbulence and noise.

[0053] In some embodiments of the volute tongue device of the present invention, in the longitudinal section of the volute tongue device 100 , the top end 121 of each comb tooth 120 is a straight line segment, and is an oblique line segment relative to the first plane 111 .

[0054] In this embodiment, the top 121 of the comb tooth 120 can be an inclined plane relative to the first plane 111. Compared with the previous embodiment, this embodiment can also prevent the superposition of vibration waveforms at the top 121 of the same comb tooth 120. In addition, a flat surface is easier to design and manufacture.

[0055] In some embodiments of the volute tongue device of the present invention, in the longitudinal section of the volute tongue device 100 , the distances between any point of the top end 121 of the same comb tooth 120 and the first plane 111 are not equal.

[0056] In this embodiment, the top 121 of the comb teeth 120 can be an inclined plane relative to the first plane 111, or a curved surface (the curved surface is a monotonic function curve segment in the longitudinal section). This embodiment prevents the vibration waveforms of the top 121 of the same comb teeth 120 from overlapping, thereby further reducing turbulence and lowering noise.

[0057] In some embodiments of the volute tongue device of the present invention, as Figure 5-7As shown, the side of the body 110 facing the wind wheel 300 is a first plane 111. In the longitudinal section of the volute tongue device 100, the top 121 of each comb tooth 120 is a sine curve segment, and the tops 121 of all comb teeth 120 are on the same sine curve. Figure 5-7 The middle dashed line is a sine curve.

[0058] In this embodiment, the tips 121 of all comb teeth 120 form a curved surface that periodically undulates in the manner of a sine function. A sine curve is a relatively smooth curve. When the tips 121 of all comb teeth 120 lie on the same sine curve in a longitudinal cross-section, the distances between the tips 121 of the comb teeth 120 and the blades of the wind rotor 300 also periodically undulate in the manner of a sine curve. This ensures that the airflow fanned by the blades of the wind rotor 300 reaches each point on the curved surface where the tips 121 of the comb teeth 120 lie at a time consistent with the periodic sine curve. This continuously staggers the phases of the vibration waveforms at adjacent points on the tips 121 of the comb teeth 120, preventing the vibration waveforms at the tips 121 of the comb teeth 120 from overlapping, significantly reducing turbulence and noise.

[0059] In some embodiments of the volute tongue device of the present invention, as Figure 6 As shown, the height difference between the crest H2 and the trough H3 of the sine curve is 2-6 mm. Preferably, the height difference between the crest H2 and the trough H3 of the sine curve is 4 mm to match the diameter, number of blades, and rotation speed of the wind wheel 300, thereby minimizing air leakage while minimizing turbulence and reducing noise.

[0060] In some embodiments of the volute tongue device of the present invention, as Figure 6 As shown, the wavelength L of the sine curve is 4-20 times the height difference between the peak H2 and the trough H3.

[0061] In this embodiment, by properly setting the wavelength of the sinusoidal curve, the airflow can be prevented from flowing transversely in the length direction of the volute tongue device 100 , and a good balance can be achieved between reducing air leakage and reducing turbulence.

[0062] Preferably, the wavelength L of the sine curve is 6-12 times the height difference between the crest H2 and the trough H3. For example, when the height difference between the crest H2 and the trough H3 is 4 mm, the wavelength L of the sine curve may be 40 mm.

[0063] In some embodiments of the volute tongue device of the present invention, as Figure 6 and Figure 8 As shown, the comb teeth 120 are evenly spaced along the length of the body 110. The thickness W1 of the comb teeth 120 is 1-5 mm. The spacing W2 between two adjacent comb teeth 120 is less than or equal to the thickness W1 of the comb teeth 120. At least five comb teeth 120 are provided in each cycle of the sine curve.

[0064] The comb teeth 120 extend along the direction of the airflow. An air guide groove 130 is formed between two adjacent comb teeth 120. The distance W2 between the two adjacent comb teeth 120 is the width of the air guide groove 130. When the comb teeth 120 are of uniform thickness, their thickness W1 is the distance between the two side walls of the comb teeth 120. When the comb teeth 120 are of variable thickness, such as Figure 8 As shown, the thickness W1 is the distance between the two side walls at the widest point of the comb teeth 120. At this time, the distance W2 between the two comb teeth 120 is the minimum width of the air guide slot 130.

[0065] In this embodiment, the thickness W1 of the comb teeth 120 is greater than or equal to the distance W2 between two adjacent comb teeth 120 , which can reduce the amount of airflow entering the air guide groove 130 , thereby reducing airflow backflow and improving the efficiency of the wind wheel 300 .

[0066] Providing five or more comb teeth 120 within each cycle of the sine curve, i.e., the comb teeth 120 are arranged densely, can reduce the height difference between adjacent comb teeth 120. If the height difference between adjacent comb teeth 120 is large, the vibration waveform will form a large amplitude phase borrow at the tips 121 of the two comb teeth 120, which is not conducive to noise reduction.

[0067] Preferably, the thickness W1 of the comb teeth 120 is 2-4 mm.

[0068] In some embodiments of the volute tongue device of the present invention, as Figure 1 and Figure 3 As shown, the two comb teeth 120 at both ends of the body 110 in the length direction are both located at the peaks of the sine curve.

[0069] The ends of the volute tongue device 100 are close to the ends of the air duct 200, where wind resistance is high and air backflow is likely to occur. In this embodiment, when the comb teeth 120 at both ends of the volute tongue device 100 are at the peak, that is, the top ends 121 of the comb teeth 120 are closer to the wind wheel 300, the airflow rate at these locations can be increased, preventing backflow at the ends of the air duct 200.

[0070] In some embodiments of the volute tongue device of the present invention, as Figure 2 and Figure 8 As shown, the side of the body 110 facing the wind wheel 300 is a first plane 111. On the projection of the first plane 111, an air guide groove 130 is formed between two adjacent comb teeth 120.

[0071] The air guide slot 130 includes a return air slot 131 and an outlet air slot 132 connected to each other. The outlet air slot 132 is close to the air duct outlet 210 of the air conditioner. The return air slot 131 forms a first gradually expanding opening 133 away from the outlet air slot 132, and the outlet air slot 132 forms a second gradually expanding opening 134 away from the return air slot 131.

[0072] When the airflow fanned by the rotor 300 strikes the windward surface of the volute device 100, it splits into two streams, one flowing toward the duct outlet 210 and the other flowing back toward the inlet of the rotor 300. The outlet slots 132 guide the airflow toward the duct outlet 210, while the return slots 131 guide the return airflow. This diversion reduces turbulence, thereby reducing wind loss and noise.

[0073] The first gradually expanding opening 133 and the second gradually expanding opening 134 are used to rectify and expand the return airflow and the outgoing airflow respectively, so that the airflow passes through quickly and part of the dynamic pressure of the airflow is converted into static pressure, further reducing turbulence and reducing noise.

[0074] In some embodiments of the volute tongue device of the present invention, as Figure 8 As shown, the second expansion angle β of the second gradually expanding opening 134 is 0.4-3 degrees. The first expansion angle α of the first gradually expanding opening 133 is greater than or equal to the second expansion angle β.

[0075] In this embodiment, the first expansion angle α is equal to or equal to the second expansion angle β, so that the return air slots 131 can fully expand the return airflow, reduce the dynamic pressure of the return airflow, and cause the return airflow to turn and re-enter the impeller 300. On the other hand, the dynamic pressure of the outlet airflow is not excessively reduced, allowing the outlet airflow to flow quickly to the air duct outlet 210.

[0076] Preferably, the second expansion angle β of the second gradually expanding opening 134 is 0.5-2 degrees.

[0077] In some embodiments of the air conditioner of the present invention, as Figure 9 As shown, the air conditioner includes an air duct 200 and a wind wheel 300 located within the air duct 200. The air duct 200 includes a volute 400 located at the outlet side of the wind wheel 300 and a volute device 100 according to any one of the above embodiments or combinations thereof. In this embodiment, the turbulence generated at the volute device 100 during operation of the air conditioner is relatively low, resulting in less noise and a better user experience.

[0078] At this point, those skilled in the art should recognize that, although multiple exemplary embodiments of the present invention have been shown and described in detail herein, many other variations or modifications consistent with the principles of the present invention can be directly determined or deduced from the contents disclosed herein without departing from the spirit and scope of the present invention. Therefore, the scope of the present invention should be understood and deemed to cover all such other variations or modifications.

Claims

1. A volute device for an air conditioner, characterized in that: include: A body, the body being configured to extend along the axial direction of the impeller of the air conditioner and being spaced apart and arranged in front of the impeller; Comb teeth, the comb teeth extending from a side of the body facing the wind wheel; the comb teeth are multiple and are sequentially spaced along the length direction of the body; Wherein, the heights of any two adjacent comb teeth are different.

2. The snail tongue device according to claim 1, characterized in that The height difference between any two of the comb teeth is 1-10 mm.

3. The snail tongue device according to claim 1, characterized in that The side of the body facing the wind wheel is a first plane; In the longitudinal section of the volute tongue device, the top end of any comb tooth is a curved segment; or In the longitudinal section of the volute tongue device, the top end of each comb tooth is a straight line segment, and is an oblique line segment relative to the first plane; or In the longitudinal section of the volute tongue device, the distance between any point on the top end of the same comb tooth and the first plane is not equal.

4. The snail tongue device according to claim 1, characterized in that The side of the body facing the wind wheel is a first plane; In the longitudinal section of the volute tongue device, the top end of any comb tooth is a sine curve segment, and the top ends of all the comb teeth are on the same sine curve.

5. The snail tongue device according to claim 4, characterized in that The wavelength of the sinusoidal curve is 4-20 times the height difference between the crest and the trough.

6. The snail tongue device according to claim 4, characterized in that The comb teeth are evenly spaced along the length of the body; the thickness of the comb teeth is 1-5 mm; the distance between two adjacent comb teeth is less than or equal to the thickness of the comb teeth; At least five comb teeth are arranged in each period of the sine curve.

7. The snail tongue device according to claim 6, characterized in that The two comb teeth at both ends of the body in the length direction are both located at the peaks of the sine curve.

8. The volute tongue device according to claim 1, characterized in that The side of the body facing the wind wheel is a first plane; on the projection of the first plane, an air guide groove is formed between two adjacent comb teeth; The air guide groove includes a return air groove and an air outlet groove connected to each other, and the air outlet groove is close to the air duct outlet of the air conditioner; The return air slot forms a first gradually expanding opening facing away from the outlet air slot, and the outlet air slot forms a second gradually expanding opening facing away from the return air slot.

9. The volute tongue device according to claim 8, characterized in that The second expansion angle of the second gradually expanding opening is 0.4-3 degrees; the first expansion angle of the first gradually expanding opening is greater than or equal to the second expansion angle.

10. An air conditioner, characterized in that: It comprises an air duct and a wind wheel in the air duct; the air duct comprises a volute on the outlet side of the wind wheel and a volute tongue device as claimed in any one of claims 1 to 9.

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