Cochlear tongue structure, volute, fan and extractor hood

Abstract

The application discloses a volute tongue structure, a volute, a fan and an extractor hood. The volute tongue structure comprises a volute tongue body and a reinforcing rib arranged on the volute tongue body, and the volute tongue body is curved. The reinforcing rib is arranged on the volute tongue body, so that the overall rigidity of the volute tongue body is improved, the springback deformation of the volute tongue body is reduced, and the manufacturing precision of the volute tongue body is ensured.

Description

Technical Field

[0001] This application relates to the field of range hood technology, and in particular to a volute tongue structure, a volute casing, a fan, and a range hood. Background Technology

[0002] Range hoods are essential appliances for kitchen ventilation. Among them, the fan is the core power component of the range hood. The fan consists of components such as the volute, impeller, and motor. The volute generally includes a front plate, a rear plate, and a surrounding plate set between the front and rear plates. The surrounding plate has a volute tongue. Due to the influence of material rebound, the volute tongue is prone to deformation, and the curvature is difficult to guarantee. Utility Model Content

[0003] This application aims to at least partially solve one of the technical problems in the related art. To this end, this application proposes a spiral tongue structure.

[0004] To achieve the above objectives, this application discloses a volute tongue structure, which includes a volute tongue body and reinforcing ribs disposed on the volute tongue body, wherein the volute tongue body is bent.

[0005] In some embodiments of this application, the reinforcing rib extends along the curvature direction of the volute tongue body.

[0006] In some embodiments of this application, the volute tongue structure is adapted to form part of the volute shell, and the number of reinforcing ribs is multiple, with the multiple reinforcing ribs arranged alternately along the axial direction of the volute shell.

[0007] In some embodiments of this application, the number of reinforcing ribs is not less than three;

[0008] And / or, the distance between adjacent reinforcing ribs is 20mm to 70mm.

[0009] In some embodiments of this application, the distance between the edge of the volute tongue body along the axial direction of the volute and the reinforcing rib is no greater than 10 mm.

[0010] In some embodiments of this application, the reinforcing rib and the volute tongue body are integrally formed.

[0011] In some embodiments of this application, the reinforcing rib protrudes from the inner side of the volute tongue body, and the reinforcing rib forms a groove on the outer side of the volute tongue body.

[0012] In some embodiments of this application, the reinforcing rib protrudes from the outer side of the volute tongue body, and the reinforcing rib forms a groove on the inner side of the volute tongue body.

[0013] In some embodiments of this application, the protrusion height of the reinforcing rib is not less than 1.5 mm and not more than 5 mm.

[0014] In some embodiments of this application, the volute tongue structure is adapted to form part of the volute shell, and the volute tongue body has serrated structures formed at both ends along the axial direction of the volute shell.

[0015] In some embodiments of this application, along the curvature direction of the volute tongue body, the volute tongue body includes a first side portion, a middle portion, and a second side portion. The middle portion is located between the first side portion and the second side portion, and the curvature of the middle portion is greater than the curvature of the first side portion and greater than the curvature of the second side portion. The serrated structure is formed at both ends of the middle portion along the axial direction of the volute shell.

[0016] In some embodiments of this application, the serrated structure includes a plurality of serrations arranged sequentially along the curvature direction of the volute tongue body.

[0017] In some embodiments of this application, the serrations are curved outwards from the inside of the volute tongue body;

[0018] And / or, the serrations are triangular or trapezoidal.

[0019] The second aspect of this application discloses a volute shell, the volute shell including the above-described volute tongue structure.

[0020] In some embodiments of this application, the volute includes a surrounding plate, and the surrounding plate and the volute tongue structure are integrally formed.

[0021] A third aspect of this application discloses a fan comprising the aforementioned volute.

[0022] The fourth aspect of this application discloses a range hood, which includes the aforementioned fan.

[0023] In this application, reinforcing ribs are provided on the worm tongue body, thereby increasing the overall rigidity of the worm tongue body, reducing the springback deformation of the worm tongue body, and ensuring the manufacturing precision of the worm tongue body.

[0024] Other advantages of this application will be set forth in part in the description which follows, and in part will be obvious from the description or may be learned by practice of this application. Attached Figure Description

[0025] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the description of the embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other designs can be obtained based on the structures shown in these drawings without creative effort.

[0026] Figure 1This is a schematic diagram of the volute in some embodiments;

[0027] Figure 2 This is another schematic diagram of the volute in some embodiments;

[0028] Figure 3 Here are exploded views of the volute in some embodiments;

[0029] Figure 4 This is a schematic diagram of the fit between the enclosure and the volute tongue structure in some embodiments;

[0030] Figure 5 This is a schematic diagram of another fit between the enclosure and the volute tongue structure in some embodiments;

[0031] Figure 6 This is a schematic diagram of the enclosure and volute structure viewed along the axial direction in some embodiments;

[0032] Figure 7 This is a schematic diagram of the cochlear tongue structure in some embodiments;

[0033] Figure 8 for Figure 7 A magnified view of a portion of the spiral tongue structure shown;

[0034] Figure 9 for Figure 7 Another schematic diagram of the spiral tongue structure shown;

[0035] Figure 10 for Figure 7 The third schematic diagram of the cochlear tongue structure is shown;

[0036] Figure 11 This is another schematic diagram of the cochlear tongue structure in some embodiments;

[0037] Figure 12 for Figure 11 A magnified view of a portion of the spiral tongue structure shown;

[0038] Figure 13 for Figure 11 Another schematic diagram of the cochlear tongue structure shown.

[0039] Explanation of icon numbers:

[0040] The volute tongue structure 100, the volute tongue body 110, the first side part 111, the second side part 112, the middle part 113, the serrations 114, the reinforcing ribs 120, the first end plate 200, the second end plate 300, and the surrounding plate 400.

[0041] The realization of the purpose, functional features and advantages of this application will be further explained in conjunction with the embodiments and with reference to the accompanying drawings. Detailed Implementation

[0042] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only a part of the embodiments of this application, and not all of the embodiments. Based on the embodiments of this application, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of this application.

[0043] It should be noted that all directional indicators (such as up, down, left, right, front, back, etc.) in the embodiments of this application are only used to explain the relative positional relationship and movement of each component in a certain specific posture (as shown in the figure). If the specific posture changes, the directional indicator will also change accordingly.

[0044] In this application, unless otherwise expressly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise expressly limited. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0045] Furthermore, the use of terms such as "first" and "second" in this application is for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Therefore, a feature defined as "first" or "second" may explicitly or implicitly include at least one of those features. Additionally, the technical solutions of the various embodiments can be combined with each other, but only on the basis of being achievable by those skilled in the art. If the combination of technical solutions is contradictory or impossible to implement, such a combination of technical solutions should be considered non-existent and not within the scope of protection claimed in this application.

[0046] The first aspect of this application discloses a snail tongue structure 100, which, in some embodiments, is combined with Figures 1 to 9 As shown, the volute tongue structure 100 includes a volute tongue body 110 and a reinforcing rib 120 provided on the volute tongue body 110, which is formed by bending. By providing the reinforcing rib 120 on the volute tongue body 110, the overall rigidity of the volute tongue body 110 is improved, thereby reducing the springback deformation of the volute tongue body 110 and ensuring the manufacturing precision of the volute tongue body 110.

[0047] The following description uses a fan as an example. The fan includes a volute, a rotor, and a motor. The volute is the component for gas collection and energy conversion, and is used to house the rotor. The volute includes a first end plate 200 (also called a front plate or rear plate), a second end plate 300 (also called a rear plate or front plate), and a surrounding plate 400. The surrounding plate 400 is located between the first end plate 200 and the second end plate 300. The first end plate 200 or the second end plate 300 may have an air inlet, or both the first end plate 200 and the second end plate 300 may have air inlets. The volute also has an air outlet. The rotor and the motor are connected. The motor drives the rotor to rotate. When the rotor rotates, the airflow enters the interior of the volute through the air inlet and is discharged through the air outlet.

[0048] The enclosure 400 is provided with a volute tongue structure 100, which is located near the air outlet. In this embodiment, the volute tongue structure 100 includes a volute tongue body 110, which acts as a flow interceptor, blocking airflow backflow and ensuring that airflow is discharged orderly from the air outlet. The volute tongue body 110 is bent to form the wall of the flow channel. Since the volute tongue body 110 is formed by bending, the material of the volute tongue body 110 needs to be suitable for bending. For example, if the material is metal, stainless steel can be selected. The volute tongue body 110 is manufactured through a bending forming process. Usually, the curvature of the volute tongue body 110 is relatively large. Due to the influence of material springback, the volute tongue body 110 is prone to deformation, and the curvature of the volute tongue body 110 is difficult to guarantee. The precision of the volute tongue body 110 has an important impact on the performance of the fan. If the volute tongue body 110 springs back, it will cause the gap between the volute tongue body 110 and the impeller to decrease, resulting in a decrease in the output air volume of the fan and an increase in noise.

[0049] Therefore, in this embodiment, the volute tongue structure 100 also includes a reinforcing rib 120, which is disposed on the volute tongue body 110. By setting the reinforcing rib 120, the overall rigidity of the volute tongue body 110 is improved, thereby resisting springback and suppressing the deformation of the volute tongue body 110, thus ensuring the manufacturing precision of the volute tongue body 110.

[0050] The reinforcing rib 120 can be a discontinuous structure, for example, the reinforcing rib 120 includes multiple alternating raised ribs that extend along a certain direction, thus forming the reinforcing rib 120. Alternatively, the reinforcing rib 120 can be a continuous structure, for example, the reinforcing rib 120 extends continuously along a certain direction. Compared to the former, the latter is easier to manufacture while ensuring the overall rigidity of the volute tongue body 110.

[0051] In some embodiments, combined with Figures 1 to 9As shown, the reinforcing rib 120 extends along the bending direction of the volute tongue body 110. The bending direction can be understood as follows: the volute has a volute profile, and the reinforcing rib 120 extends along the extension direction of the volute profile. In other words, the reinforcing rib 120 can be considered as a curve perpendicular to the central axis of the volute, which is analogous to the central axis of a wind turbine. The springback deformation of the volute tongue body 110 will cause it to tend to "flatten." By extending the reinforcing rib 120 along the bending direction of the volute tongue body 110, the reinforcing rib 120 can increase the stiffness of the volute tongue body 110 in the bending direction. Furthermore, the reinforcing rib 120 can directly resist the reverse springback of the volute tongue body 110 along the bending direction, better preventing deformation of the volute tongue body 110 and ensuring the manufacturing precision of the volute tongue body 110.

[0052] For example, along the bending direction of the tongue body 110, the tongue body 110 includes a first side portion 111, a middle portion 113, and a second side portion 112. The middle portion 113 is located between the first side portion 111 and the second side portion 112, and the curvature of the middle portion 113 is greater than the curvature of the first side portion 111 and greater than the curvature of the second side portion 112. The middle portion 113 has a larger curvature, so the middle portion 113 is most likely to rebound. By extending the reinforcing rib 120 along the bending direction of the tongue body 110 to the first side portion 111, the middle portion 113, and the second side portion 112, the rebound of the middle portion 113 can be suppressed, thereby suppressing the rebound of the entire tongue body 110 and preventing the middle portion 113 from cracking.

[0053] In some embodiments, combined with Figure 7 and Figure 9 As shown, the volute tongue structure 100 constitutes part of the volute shell. There are multiple reinforcing ribs 120, which are arranged alternately along the axial direction of the volute shell. "Multiple" in this context means two or more; optionally, the number of reinforcing ribs 120 is not less than three, for example... Figure 7 There are 3 reinforcing ribs in the 120 section.

[0054] The volute tongue structure 100 is located between the first end plate 200 and the second end plate 300. Since the first end plate 200 and the second end plate 300 need to be a certain distance apart in order to accommodate the impeller, the volute tongue body 110 also has a certain axial dimension along the axial direction of the volute. Therefore, in this embodiment, based on the reinforcing rib 120 extending along the bending direction of the volute tongue body 110, multiple reinforcing ribs 120 are provided. The multiple reinforcing ribs 120 are arranged alternately along the axial direction of the volute. In this way, the volute tongue body 110 can be constrained by the corresponding reinforcing ribs 120 along the axial direction of the volute. The overall rigidity of the volute tongue body 110 is greater, and the effect of resistance to deformation is improved.

[0055] The distance between adjacent reinforcing ribs 120 is 20mm to 70mm. (See also...) Figure 8As shown, the distance between adjacent reinforcing ribs 120 is H1, and the value of H1 ranges from 20mm to 70mm. For example, H1 can be 20mm, 30mm, 40mm, 50mm, 60mm, or 70mm. When the reinforcing ribs 120 are too dense, although the rigidity of the volute body 110 can be ensured, the manufacturing difficulty is increased. When the reinforcing ribs 120 are too sparse, although the rigidity of the volute body 110 can still be improved to a certain extent, the improvement effect is limited, and the part of the volute body 110 located between adjacent reinforcing ribs 120 is relatively weak. In this embodiment, by limiting the distance between adjacent reinforcing ribs 120, the rigidity of the volute body 110 can be improved while also taking into account manufacturing efficiency, which meets the requirements of most volutes used in range hoods.

[0056] Optionally, the distance between the edge of the volute tongue body 110 along the axial direction of the volute and the reinforcing rib 120 is no greater than 10 mm. See also Figure 8 As shown, the distance between the edge of the volute tongue body 110 along the axial direction of the volute and the reinforcing rib 120 is H2, and H2 is no greater than 10mm. For example, H2 is 10mm, 8mm, 6mm, 4mm, or 2mm. The two ends of the volute tongue body 110 along the axial direction of the volute are open ends, making them easier to deform. Therefore, in this embodiment, limiting H2 to no more than 10mm is more conducive to strengthening the constraint on the ends of the volute tongue body 110. Typically, H needs to be greater than 2mm, which facilitates the setting of the reinforcing rib 120.

[0057] Taking the volute tongue body 110 as an example, it is provided with three reinforcing ribs 120. Along the axial direction of the volute, they are the first reinforcing rib, the second reinforcing rib and the third reinforcing rib in sequence. The distance H2 between the first reinforcing rib and the edge of one end of the volute tongue body is not greater than 10mm, and the distance H2 between the second reinforcing rib and the edge of the other end of the volute tongue body 110 is not greater than 10mm.

[0058] There are several ways to install the reinforcing rib 120 on the volute tongue body 110. For example, the reinforcing rib 120 can be a separate component from the volute tongue body 110 and connected and fixed to the volute tongue body 110 by a connecting means. Alternatively, the reinforcing rib 120 can be fixed to the volute tongue body 110 by welding. However, this method complicates manufacturing and may create new stress zones near the welding points. Therefore, in this embodiment, the reinforcing rib 120 and the volute tongue body 110 are integrally formed. This simplifies the manufacturing of both the reinforcing rib 120 and the volute tongue body 110, and avoids the creation of new stress zones during the formation of the reinforcing rib 120. The overall structural rigidity of the volute tongue structure 100 is greater, which is more conducive to suppressing the deformation of the volute tongue body 110.

[0059] When the reinforcing rib 120 and the volute tongue body 110 are integrally formed, the reinforcing rib 120 can be formed by stamping, thereby protruding onto the surface of the volute tongue body 110. Alternatively, it can be combined with... Figures 10 to 13 As shown, the reinforcing rib 120 protrudes from the inner side of the volute tongue body 110, and thus the reinforcing rib 120 forms a groove on the outer side of the volute tongue body 110. The inner side of the volute tongue body 110 is the side facing the inside of the volute shell, and the outer side of the volute tongue body 110 is the side facing away from the inside of the volute shell. For example, the reinforcing rib 120 is stamped from the outer side of a plate towards the inner side of the plate. The plate is then bent to form the volute tongue structure 100 at the same time as forming the volute tongue body 110 (the reinforcing rib 120 is bent simultaneously).

[0060] It can also be a combination Figures 7 to 9 As shown, the reinforcing rib 120 protrudes from the outer side of the volute tongue body 110, and thus the reinforcing rib 120 forms a groove on the inner side of the volute tongue body 110.

[0061] Optionally, the protrusion height of the reinforcing rib 120 is not less than 1.5mm and not more than 5mm. For example, the protrusion height of the reinforcing rib 120 is 1.5mm, 2mm, 3mm, 4mm or 5mm. By optimizing the protrusion height of the reinforcing rib 120, the rigidity of the volute tongue body 110 and its influence on airflow are taken into account.

[0062] In some embodiments, combined with Figures 7 to 13 As shown, the volute tongue structure 100 is adapted to form part of the volute shell, and the volute tongue body 110 has serrated structures formed at both ends along the axial direction of the volute shell.

[0063] The volute tongue body 110 is formed by bending, thus having a relatively large curvature. Therefore, the volute tongue body 110 accumulates a large stress. In this embodiment, a serrated structure is formed at both ends of the volute tongue body 110 along the axial direction of the volute shell. This can release the stress of the volute tongue body 110, thereby further suppressing the deformation of the volute tongue body 110. With the setting of the reinforcing rib 120, the manufacturing precision of the volute tongue body 110 is greatly improved.

[0064] In some embodiments, combined with Figures 7 to 13 As shown, along the curvature of the volute tongue body 110, the volute tongue body 110 includes a first side portion 111, a middle portion 113, and a second side portion 112. The middle portion 113 is located between the first side portion 111 and the second side portion 112, and the curvature of the middle portion 113 is greater than the curvature of the first side portion 111 and greater than the curvature of the second side portion 112. The middle portion 113 has serrated structures formed at both ends along the axial direction of the volute shell.

[0065] The first side portion 111, the middle portion 113, and the second side portion 112 together constitute the volute tongue body 110. The curvature of the middle portion 113 is greater than that of the first side portion 111 and the second side portion 112, meaning that the middle portion 113 is more curved. The stress of the volute tongue body 110 is mainly concentrated in the middle portion 113. By forming serrated structures at both ends of the middle portion 113 along the axial direction of the volute shell, the rebound deformation of the middle portion 113 is prevented. The serrated structure can be provided only in the middle portion 113 to suppress the deformation of the entire volute tongue body 110, or the serrated structure can be provided in both the middle portion 113 and the first side portion 111 and the second side portion 112. Compared with the latter, the former only provides a serrated structure in the middle portion 113, which simplifies the structure as much as possible while ensuring the release of stress in the volute tongue body 110.

[0066] In some embodiments, combined with Figure 8 and Figure 12 As shown, the serrated structure includes multiple serrations 114 arranged sequentially along the bending direction of the volute tongue body 110. For example, multiple serrations 114 are arranged close together in sequence. By arranging multiple serrations 114 sequentially along the bending direction, stress can be released through the serrated structure along the bending direction of the volute tongue body 110, thereby improving the stress release effect. Optionally, the serrations 114 can be triangular or trapezoidal, and of course, other shapes are also possible, which are not limited here.

[0067] In some embodiments, combined with Figure 8 and Figure 12 As shown, the serrations 114 bend outwards from the inside of the volute tongue body 110, meaning the serrations 114 bend outwards from the inside of the volute shell. This serrated structure effectively forms a flanged structure. The volute tongue structure 100 is positioned between the first end plate 200 and the second end plate 300. Therefore, in this embodiment, the serrations 114 bend outwards from the inside of the volute tongue body 110, allowing the serrated structure to function as a flange. One end of the serrated structure abuts against the first end plate 200, and the other end abuts against the second end plate 300, ensuring the stability of the volute shell. Furthermore, the outward bending of the serrations 114 from the inside of the volute tongue body 110 does not interfere with the internal airflow of the volute shell, and airflow is unlikely to leak outwards from the gaps between the serrations 114.

[0068] The second aspect of this application discloses a volute housing. In some embodiments, the volute housing includes the volute tongue structure 100 of the above embodiments. The volute housing includes a first end plate 200, a second end plate 300, and a surrounding plate 400. The surrounding plate 400 is disposed between the first end plate 200 and the second end plate 300, and the surrounding plate 400 is provided with the volute tongue structure 100. The volute tongue structure 100 includes a volute tongue body 110 and a reinforcing rib 120 disposed on the volute tongue body 110. The volute tongue body 110 is bent. The reinforcing rib 120 is provided on the volute tongue body 110. By providing the reinforcing rib 120, the rigidity of the volute tongue body 110 is improved, thereby reducing material springback and suppressing deformation of the volute tongue body 110, thus ensuring the manufacturing accuracy of the volute tongue body 110. The volute tongue structure of the volute housing in this embodiment adopts the technical solution of the above embodiments, and therefore has at least the beneficial effects brought by the technical solution of the above embodiments, which will not be repeated here.

[0069] In some embodiments, the shroud 400 and the volute tongue structure 100 are integrally formed, simplifying the structure. For example, a portion of a sheet metal is stamped to form a reinforcing rib 120, and then this portion is bent to form both the volute tongue body 110 and the volute tongue structure 100. The remaining portions of the sheet metal are bent along the spiral direction of the volute's profile. Thus, when viewed along the axial direction of the volute, this sheet metal approximates an Archimedean spiral. It is then connected to the first end plate 200 and the second end plate 300 to form the volute.

[0070] The third aspect of this application discloses a fan. In some embodiments, the fan includes the aforementioned volute, with a fan impeller disposed within the volute. The fan motor is connected to the impeller, and the motor drives the impeller to rotate. Airflow enters the interior of the volute from the air inlet and exits from the air outlet. The volute of the fan in this embodiment adopts the technical solution of the above embodiments, and therefore possesses at least the beneficial effects brought about by the technical solutions of the above embodiments, which will not be repeated here.

[0071] The fourth aspect of this application discloses a range hood. In some embodiments, the range hood includes the fan described in the above embodiments, and the range hood can exhaust kitchen fumes to the outside. The fan of the range hood in this embodiment adopts the technical solution of the above embodiments, and therefore has at least the beneficial effects brought by the technical solution of the above embodiments, which will not be repeated here.

[0072] The above description is merely a preferred embodiment of this application and does not limit the patent scope of this application. Any equivalent structural transformations made based on the concept of this application and the contents of the specification and drawings of this application, or direct / indirect applications in other related technical fields, are included within the patent protection scope of this application.

Claims

1. A spiral tongue structure (100), characterized in that, The worm tongue structure (100) includes a worm tongue body (110) and a reinforcing rib (120) provided on the worm tongue body (110), the worm tongue body (110) being bent.

2. The cochlear tongue structure (100) as described in claim 1, characterized in that, The reinforcing rib (120) extends along the bending direction of the volute tongue body (110).

3. The cochlear tongue structure (100) as described in claim 2, characterized in that, The volute tongue structure (100) is adapted to form part of the volute shell, and there are multiple reinforcing ribs (120), which are arranged alternately along the axial direction of the volute shell.

4. The cochlear tongue structure (100) as described in claim 3, characterized in that, The number of the reinforcing ribs (120) shall not be less than three; And / or, the distance between adjacent reinforcing ribs (120) is 20mm to 70mm.

5. The cochlear tongue structure (100) as described in claim 3, characterized in that, The distance between the edge of the volute tongue body (110) along the axial direction of the volute and the reinforcing rib (120) is no greater than 10 mm.

6. The cochlear tongue structure (100) as described in claim 1, characterized in that, The reinforcing rib (120) and the volute tongue body (110) are integrally formed.

7. The cochlear tongue structure (100) as described in claim 6, characterized in that, The reinforcing rib (120) protrudes from the inner side of the volute tongue body (110), and the reinforcing rib (120) forms a groove on the outer side of the volute tongue body (110).

8. The cochlear tongue structure (100) as described in claim 6, characterized in that, The reinforcing rib (120) protrudes from the outer side of the volute tongue body (110), and the reinforcing rib (120) forms a groove on the inner side of the volute tongue body (110).

9. The worm tongue structure (100) as described in claim 7 or 8, characterized in that, The protrusion height of the reinforcing rib (120) is not less than 1.5 mm and not more than 5 mm.

10. The cochlear tongue structure (100) as claimed in claim 1, characterized in that, The volute tongue structure (100) is adapted to form part of the volute shell, and the volute tongue body (110) has serrated structures formed at both ends along the axial direction of the volute shell.

11. The worm tongue structure (100) as described in claim 10, characterized in that, Along the curvature of the volute tongue body (110), the volute tongue body (110) includes a first side portion (111), a middle portion (113), and a second side portion (112). The middle portion (113) is located between the first side portion (111) and the second side portion (112), and the curvature of the middle portion (113) is greater than the curvature of the first side portion (111) and greater than the curvature of the second side portion (112). The middle portion (113) has serrated structures formed at both ends along the axial direction of the volute.

12. The snail tongue structure (100) as described in claim 10, characterized in that, The serrated structure includes a plurality of serrations (114) arranged sequentially along the curvature of the snail tongue body (110).

13. The worm tongue structure (100) as described in claim 12, characterized in that, The serrations (114) are curved outwards from the inside of the snail tongue body (110); And / or, the serrations (114) are triangular or trapezoidal.

14. A volute, characterized in that, Includes the cochlear tongue structure (100) as described in any one of claims 1 to 13.

15. The volute as described in claim 14, characterized in that, The volute includes a surrounding plate (400), and the surrounding plate (400) and the volute tongue structure (100) are integrally formed.

16. A fan, characterized in that, Includes the volute as described in claim 14 or 15.

17. A range hood, characterized in that, Includes the wind turbine as described in claim 16.

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