Volute, fan and air supply equipment

Abstract

The utility model relates to a volute casing, fan and air supply equipment, the volute casing includes: volute casing body, first volute tongue and first bulge, be equipped with impeller cavity and first air duct in the volute casing body, first volute tongue is provided with first air duct and impeller cavity connection position, first bulge is provided with impeller cavity inner circumferential wall, first volute tongue is provided with first air duct and impeller cavity connection position, first bulge is provided with impeller cavity inner circumferential wall. And the first bulge is arranged adjacent to the first volute tongue. The volute is reasonable in structural design, single-frequency noise generated when the impeller works can be reduced, and the noise reduction effect is good.

Description

Technical Field

[0001] This utility model relates to the field of air supply equipment technology, specifically to a volute, a fan, and an air supply device. Background Technology

[0002] Aerodynamic noise is the main source of noise in fans. In the flow channel structure of the volute casing, a volute tongue structure is usually installed to ensure smooth airflow from the outlet. However, the volute tongue generates significant rotational noise when the impeller is operating. In related technologies, the structural design of the volute tongue is often unreasonable, resulting in limited noise reduction. Utility Model Content

[0003] This utility model aims to at least partially solve one of the technical problems in the related art.

[0004] Therefore, embodiments of this utility model propose a volute housing with a reasonably designed volute tongue structure that can reduce the single-frequency noise generated when the impeller is working, resulting in a good noise reduction effect.

[0005] An embodiment of this utility model also proposes a fan.

[0006] An embodiment of this utility model also proposes an air supply device.

[0007] The volute of this utility model includes: a volute body, wherein an impeller cavity and a first air duct are provided in the volute body; a first volute tongue and a first protrusion, wherein the first volute tongue is provided at the connection position between the first air duct and the impeller cavity, and the first protrusion is provided on the inner peripheral wall of the impeller cavity, and the first protrusion is arranged adjacent to the first volute tongue.

[0008] According to the volute of the present invention, when the impeller inside the volute rotates, part of the airflow will be discharged through the first air duct, and another part of the airflow will return to the impeller cavity. Since the first protrusion is provided on the inner peripheral wall of the impeller cavity and the first protrusion is arranged adjacent to the first volute tongue, the airflow returning to the impeller cavity can impact the first volute tongue and the first protrusion in sequence to reduce the single-frequency noise generated when the fan is working, and the noise reduction effect is good.

[0009] In some embodiments, the first protrusion includes a first surface, which is disposed on the side of the first protrusion near the first volute tongue. One side of the first surface in the width direction is in contact with the inner peripheral wall of the impeller cavity, and the length direction of the first surface has an angle α with the axial end face of the volute body.

[0010] In some embodiments, 5°≤α≤85°.

[0011] In some embodiments, the first protrusion includes a first surface disposed on the side of the first protrusion near the first volute tongue, one side of the first surface in the width direction is in contact with the inner peripheral wall of the impeller cavity, and the extension path of the first surface in its length direction is a straight line or a curve.

[0012] In some embodiments, the first protrusion includes a first surface, which is disposed on the side of the first protrusion near the first volute tongue. One side of the first surface in the width direction is in contact with the inner peripheral wall of the impeller cavity. The first surface includes a plurality of bent surfaces, which are arranged sequentially along the length direction of the first surface.

[0013] In some embodiments, the shortest distance between the first surface and the first volute tongue is L1, wherein 0mm≤L1≤40mm.

[0014] In some embodiments, the width dimension of the first surface is L2, wherein 3mm≤L2≤20mm.

[0015] In some embodiments, the first protrusion extends along a first direction, and in the first direction, the first protrusion maintains a constant cross-section orthogonal to the first direction.

[0016] In some embodiments, the volute body includes an end plate and a side plate, the end plate and the side plate forming the impeller cavity, the end plate being used to mount the impeller, the first protrusion being disposed on the side plate, the side plate having a first side close to the end plate and a second side away from the end plate, and the cross-section of the first protrusion gradually decreasing in the direction from the first side to the second side.

[0017] In some embodiments, the first protrusion includes a first surface, a second surface, and a third surface, the second surface being parallel to the inner peripheral wall of the side plate, the first surface being disposed on the side of the second surface near the first volute tongue, and the third surface being disposed on the side of the second surface away from the first volute tongue.

[0018] In some embodiments, the outer periphery of the second surface is a triangle or trapezoid in a projection plane orthogonal to the second surface.

[0019] In some embodiments, the first protrusion is integrally formed with the volute body, and the side plate opposite to the first protrusion is provided with a draft groove.

[0020] In some embodiments, the volute body is provided with a second air duct, the first air duct and the second air duct are arranged circumferentially spaced along the impeller cavity, the volute also includes a second volute tongue and a second protrusion, the second volute tongue is provided at the connection position between the second air duct and the impeller cavity, the second protrusion is provided radially along the inner peripheral wall of the impeller cavity, and the second protrusion is arranged adjacent to the second volute tongue.

[0021] In some embodiments, the outer dimensions of the first air duct are the same as those of the second air duct, and the outer dimensions of the first protrusion are the same as those of the second protrusion.

[0022] Another embodiment of the fan of the present invention includes: a volute, wherein the volute is the volute described in any one of the embodiments of the present invention; and an impeller disposed within the impeller cavity.

[0023] According to the embodiment of the present invention, when the impeller inside the volute rotates, part of the airflow will be discharged through the first air duct, and another part of the airflow will return to the impeller cavity. Since the first protrusion is arranged radially on the inner peripheral wall of the impeller cavity and adjacent to the first volute tongue, the airflow returning to the impeller cavity can sequentially impact the first volute tongue and the first protrusion to reduce the single-frequency noise generated when the fan is working, and the noise reduction effect is good.

[0024] Another embodiment of the air supply device of this utility model includes the fan described in the embodiment of this utility model.

[0025] According to the embodiment of the present invention, when the impeller inside the volute rotates, part of the airflow will be discharged through the first air duct, and another part of the airflow will return to the impeller cavity. Since the first protrusion is provided on the inner peripheral wall of the impeller cavity and the first protrusion is arranged adjacent to the first volute tongue, the airflow returning to the impeller cavity can impact the first volute tongue and the first protrusion in sequence to reduce the single-frequency noise generated when the fan is working, and the noise reduction effect is good. Attached Figure Description

[0026] Figure 1 This is a perspective view of the volute casing according to an embodiment of the present utility model.

[0027] Figure 2 This is a cross-sectional view of the volute casing according to an embodiment of the present invention.

[0028] Figure 3 This is a cross-sectional view of the volute casing according to another embodiment of the present invention.

[0029] Figure 4 This is a simplified structural diagram of the first protrusion of the volute shell in another embodiment of the present invention.

[0030] Figure 5This is a simplified structural diagram of the first protrusion of the volute shell in another embodiment of the present invention.

[0031] Figure 6 This is a partial cross-sectional view of the volute casing according to an embodiment of the present invention.

[0032] Figure 7 This is a top view of the volute casing according to an embodiment of the present invention.

[0033] Figure 8 This is a schematic diagram of the installation of the volute and impeller according to an embodiment of the present invention.

[0034] Figure 9 This is a noise comparison curve between the volute of this utility model embodiment and the volute in related technologies.

[0035] Figure label:

[0036] 1. Volute body; 11. First air duct; 12. Second air duct; 13. Impeller cavity; 131. First air outlet; 132. Second air outlet; 14. Draft groove; 15. End plate; 16. Side plate; 161. First side; 162. Second side;

[0037] 2. First cochlear tongue;

[0038] 3. First protrusion; 31. First surface; 311. Bending surface; 32. Second surface; 33. Third surface;

[0039] 4. Second cochlear tongue;

[0040] 5. Second protrusion;

[0041] 6. Impeller. Detailed Implementation

[0042] The embodiments of the present invention are described in detail below, examples of which are shown in the accompanying drawings. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0043] The following is a reference appendix. Figures 1 to 9 This invention describes a volute, a fan, and an air supply device according to embodiments of the present invention.

[0044] like Figures 1 to 3 As shown, the volute of this utility model embodiment includes: a volute body 1, a first volute tongue 2 and a first protrusion 3. The volute body 1 is provided with an impeller cavity 13 and a first air duct 11. The first volute tongue 2 is located at the connection position between the first air duct 11 and the impeller cavity 13. The first protrusion 3 is located on the inner peripheral wall of the impeller cavity 13 and is arranged adjacent to the first volute tongue 2.

[0045] According to the volute of the present invention, when the impeller 6 inside the volute rotates, part of the airflow will be discharged through the first air duct 11, and another part of the airflow will return to the impeller cavity 13. Since the first protrusion 3 is disposed on the inner peripheral wall of the impeller cavity 13 and the first protrusion 3 is arranged adjacent to the first volute tongue 2, the airflow returning to the impeller cavity 13 can sequentially impact the first volute tongue 2 and the first protrusion 3 to reduce the single-frequency noise generated when the fan is working, and the noise reduction effect is good.

[0046] It is understandable that, such as Figure 7 and Figure 8 In the illustrated embodiment, the impeller cavity 13 is used to mount the impeller 6. The radial direction of the impeller cavity 13 is consistent with the radial direction of the impeller 6, and the axial direction of the impeller cavity 13 is consistent with the axial direction of the impeller 6. The inner peripheral wall of the impeller cavity 13 is generally formed into a cylindrical structure, and the first protrusion 3 is disposed on the inner peripheral wall of the impeller cavity 13 along the radial direction of the impeller cavity 13.

[0047] like Figure 7 As shown, the impeller cavity 13 has a first air outlet 131, and the first air duct 11 is connected to the impeller cavity 13 through the first air outlet 131. The first volute tongue 2 is located at the position of the first air outlet 131. The first protrusion 3 is arranged adjacent to the first volute tongue 2, that is, the first protrusion 3 is arranged adjacent to the first air outlet 131.

[0048] It is understandable that, such as Figure 7 As shown, the airflow returning to the impeller cavity 13 first passes through the first volute tongue 2, and then through the first protrusion 3. That is to say, the first volute tongue 2 and the first protrusion 3 together constitute multiple volute tongues. Under the dual action of the first volute tongue 2 and the first protrusion 3, the noise phase can be changed, the periodic pressure fluctuations generated when the impeller 6 rotates can be reduced, and the impact intensity of the airflow can be reduced, thereby improving the "whistling" sound (i.e., blade passing noise) generated when the fan is working.

[0049] like Figure 9 As shown, the double volute tongue (first volute tongue 2 and first protrusion 3) scheme of the volute of the embodiment of this utility model, compared with the scheme of using a single straight volute tongue in the related technology, can significantly reduce the single-frequency noise generated when the fan is working, and the humming sound is obviously eliminated.

[0050] In addition, compared with the solution of "setting a single inclined volute tongue in the volute", the volute of the embodiment of the present invention does not reduce the air volume discharged by the volute, which can reduce the energy consumption of the fan and improve the noise reduction effect.

[0051] like Figure 2 and Figure 3As shown, the first protrusion 3 includes a first surface 31, which is located on the side of the first protrusion 3 near the first volute tongue 2. The width direction of the first surface 31 is connected to the inner peripheral wall of the impeller cavity 13, and the length direction of the first surface 31 has an angle α with the axial end face of the volute body 1.

[0052] When the included angle α is 90°, the length direction of the first surface 31 is perpendicular to the axial end face of the volute body 1, that is, the first surface 31 is arranged vertically. At this time, the first protrusion 3 has a certain improvement on the noise reduction effect of the fan during operation.

[0053] When the included angle α is less than 90°, the angle between the length direction of the first surface 31 and the axial end face of the volute body 1 is an acute angle, that is, the first surface 31 of the volute is designed with an inclination. This can prevent the airflow discharged from the volute from impacting the first surface 31 of the first protrusion 3 at the same time, effectively reducing the impact intensity of the airflow and resulting in a significant noise reduction effect.

[0054] Optionally, 5°≤α≤85°. For example, the included angle α can be 5°, 10°, 20°, 30°, 40°, 50°, 60°, 70°, 80°, or 85°. In this embodiment of the invention, the volute, by designing the first protrusion 3 close to the side of the first volute tongue 2 (first surface 31) with the above parameters, can prevent the airflow discharged from the volute from impacting the first surface 31 of the first protrusion 3 simultaneously, effectively reducing the impact intensity of the airflow. Furthermore, it alters the fluid velocity vector on the surface of the first protrusion 3, reducing the local turbulence intensity in the region of the first protrusion 3, and contributing to the reduction of local turbulence mixing noise.

[0055] Optionally, such as Figures 1 to 3 As shown, the first protrusion 3 includes a first surface 31, which is located on the side of the first protrusion 3 near the first volute tongue 2. One side of the first surface 31 in the width direction is in contact with the inner peripheral wall of the impeller cavity 13. The extension path of the first surface 31 in its length direction can be a straight line or a curve. In other words, the extension path of the first surface 31 in its length direction can be a straight line or a curve. This facilitates the manufacturing of the first protrusion 3 and reduces turbulent mixing noise in the area of ​​the first protrusion 3, resulting in a better noise reduction effect.

[0056] Optionally, such as Figure 4As shown, the first protrusion 3 includes a first surface 31, which is located on the side of the first protrusion 3 near the first volute tongue 2. One side of the first surface 31 in the width direction is in contact with the inner peripheral wall of the impeller cavity 13. The first surface 31 includes multiple bent surfaces 311, which are arranged sequentially along the length direction of the first surface 31. It can be understood that the first surface 31 is composed of multiple inclined bent surfaces 311, which can further reduce the turbulent mixing noise in the region of the first protrusion 3, weaken the impact intensity of the airflow, and help improve the noise reduction effect of the fan.

[0057] The included angle between each bending surface 311 and the axial end face of the volute body 1 is between 5° and 85° to ensure that the fan has a good noise reduction effect.

[0058] Optionally, such as Figure 3 As shown, the shortest distance between the first surface 31 and the first volute tongue 2 is L1, where 0mm ≤ L1 ≤ 40mm. For example, L1 can be 0mm, 5mm, 10mm, 15mm, 20mm, 25mm, 30mm, 35mm, or 40mm. By using the above-mentioned spacing between the first surface 31 and the first volute tongue 2, the volute casing of this embodiment can further reduce the noise generated when the impeller 6 rotates, resulting in a more significant noise reduction effect.

[0059] Optionally, such as Figure 6 As shown, the width of the first surface 31 is L2, where 3mm ≤ L2 ≤ 20mm. For example, L2 can be 3mm, 5mm, 7mm, 9mm, 11mm, 13mm, 15mm, 17mm, or 20mm. By designing the width of the first surface 31 to the above dimensions, the volute of this embodiment can further reduce the noise generated when the impeller 6 rotates, resulting in a more significant noise reduction effect.

[0060] In one example, such as Figure 3 As shown, the first protrusion 3 extends along a first direction, and in this first direction, the cross-section of the first protrusion 3 perpendicular to the first direction remains constant. It can be understood that the first direction is the length direction of the first protrusion 3, and the cross-section of the first protrusion 3 perpendicular to the first direction remains constant along its length. In other words, the first protrusion 3 is generally a strip-shaped structure extending along the first direction, which allows for a simple shape and better noise reduction.

[0061] In other examples, the cross-section of the first protrusion 3 along the first direction orthogonal to the first direction is not constant. For example, the cross-section of the first protrusion 3 along the first direction orthogonal to the first direction may gradually increase or decrease along its length. Alternatively, the cross-section of the first protrusion 3 may change abruptly in a certain region along the first direction; this invention does not limit this.

[0062] For example, the first protrusion 3 can be a strip-shaped rib, which is inclinedly arranged on the inner peripheral wall of the impeller cavity 13 and adjacent to the first volute tongue 2.

[0063] The ribs can be bonded, screwed, or snapped onto the inner peripheral wall of the impeller cavity 13, or they can be integrally formed and set on the inner peripheral wall of the impeller cavity 13.

[0064] In some embodiments, such as Figure 1 and Figure 2 As shown, the volute body 1 includes an end plate 15 and a side plate 16, which together form an impeller cavity 13. The end plate 15 is used to mount the impeller 6. A first protrusion 3 is provided on the side plate 16. The side plate 16 has a first side 161 close to the end plate 15 and a second side 162 away from the end plate 15. In the direction from the first side 161 to the second side 162, the cross-section of the first protrusion 3 gradually decreases.

[0065] It is understandable that the cross-section of the first protrusion 3 near the first side 161 is larger, and the cross-section of the first protrusion 3 near the second side 162 is smaller. Since the cross-section of the first protrusion 3 gradually decreases in the direction from the first side 161 to the second side 162, it is convenient for the first protrusion 3 to be molded along the direction from the second side 162 to the first side 161 during manufacturing, and it is also convenient for the processing and manufacturing of the mold, reducing the manufacturing difficulty of the volute.

[0066] like Figure 1 and Figure 6 As shown, the first protrusion 3 is integrally formed with the volute body 1, and the side plate 16 is provided with a draft groove 14 on the side opposite to the first protrusion 3. It can be understood that the area of ​​the draft groove 14 of the first protrusion 3 is used to arrange the mold. When the volute is injection molded, the position of the draft groove 14 is used for mold removal to form the first protrusion 3 protruding towards the impeller cavity 13.

[0067] Optionally, such as Figure 1 and Figure 2 As shown, the first protrusion 3 includes a first surface 31, a second surface 32, and a third surface 33. The second surface 32 is parallel to the inner peripheral wall of the side plate 16. The first surface 31 is located on the side of the second surface 32 near the first volute tongue 2, and the third surface 33 is located on the side of the second surface 32 away from the first volute tongue 2. Because the second surface 32 is arranged parallel to the inner peripheral wall of the side plate 16, the resistance to airflow in the impeller cavity 13 can be reduced. The length direction of the third surface 33 can be perpendicular to the end plate 15, or it can have a certain angle with the end plate 15 (i.e., the third surface 33 is arranged at an angle).

[0068] For example, such as Figure 2 and Figure 5As shown, in the projection plane orthogonal to the second surface 32, the outer periphery of the second surface 32 is triangular or trapezoidal, which facilitates the molding process during injection molding of the first protrusion 3, simplifies the processing technology of the volute, and facilitates the processing and manufacturing of the volute.

[0069] In some embodiments, such as Figure 1 and Figure 7 As shown, the volute body 1 is provided with a second air duct 12. The first air duct 11 and the second air duct 12 are arranged at intervals along the circumference of the impeller cavity 13. The volute also includes a second volute tongue 4 and a second protrusion 5. The second volute tongue 4 is located at the connection position between the second air duct 12 and the impeller cavity 13. The second protrusion 5 is located on the inner circumferential wall of the impeller cavity 13 along the radial direction of the impeller cavity 13, and the second protrusion 5 is arranged adjacent to the second volute tongue 4.

[0070] Understandably, the volute can adopt a dual-channel design to improve its flexibility during use. When the impeller 6 inside the volute rotates, part of the airflow is discharged through the second channel 12, and the other part of the airflow returns to the impeller cavity 13. Since the second protrusion 5 is located radially along the inner circumferential wall of the impeller cavity 13 and is arranged adjacent to the second volute tongue 4, the airflow returning to the impeller cavity 13 can sequentially impact the second volute tongue 4 and the second protrusion 5, thereby reducing the single-frequency noise generated when the fan is working, resulting in a good noise reduction effect.

[0071] like Figure 7 As shown, the impeller cavity 13 has a second air outlet 132, and the second air duct 12 is connected to the impeller cavity 13 through the second air outlet 132. The second volute tongue 4 is located at the position of the second air outlet 132. The second protrusion 5 is arranged adjacent to the second volute tongue 4, that is, the second protrusion 5 is arranged adjacent to the second air outlet 132.

[0072] Optionally, the outer dimensions of the first air duct 11 are the same as those of the second air duct 12, and the outer dimensions of the first protrusion 3 are the same as those of the second protrusion 5. This ensures that the air volume of the first air duct 11 and the second air duct 12 are consistent, as well as that of the first protrusion 3 and the second protrusion 5, thereby improving the stability of the fan during operation.

[0073] like Figure 8 As shown, another embodiment of the fan of the present invention includes: a volute and an impeller 6, wherein the volute is the volute of the present invention, and the impeller 6 is disposed in the impeller cavity 13.

[0074] According to the embodiment of the present invention, when the impeller 6 inside the volute rotates, part of the airflow will be discharged through the first air duct 11, and another part of the airflow will return to the impeller cavity 13. Since the first protrusion 3 is arranged radially along the inner peripheral wall of the impeller cavity 13 and adjacent to the first volute tongue 2, the airflow returning to the impeller cavity 13 can sequentially impact the first volute tongue 2 and the first protrusion 3 to reduce the single-frequency noise generated when the fan is working, and the noise reduction effect is good.

[0075] Another embodiment of the air supply device of this utility model includes the fan of this utility model. The technical advantages of the air supply device of this utility model embodiment are the same as the technical advantages of the fan or volute of the above embodiments, and will not be repeated here.

[0076] For example, the air supply device can be an air conditioner or an air purifier.

[0077] In the description of this utility model, it should be understood that the terms "center", "longitudinal", "transverse", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating the orientation or positional relationship are based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this utility model and simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this utility model.

[0078] Furthermore, the terms "first" and "second" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of indicated technical features. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this utility model, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0079] In this utility model, unless otherwise explicitly specified and limited, the terms "installation," "connection," "joining," and "fixing," etc., should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral part; they can refer to a mechanical connection, an electrical connection, or a connection that allows communication between them; they can refer to a direct connection or an indirect connection through an intermediate medium; they can refer to the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this utility model according to the specific circumstances.

[0080] In this utility model, unless otherwise explicitly specified and limited, "above" or "below" the second feature can mean that the first feature is in direct contact with the second feature, or that the first feature is in indirect contact with the second feature through an intermediate medium. Furthermore, "above," "on top of," and "over" the second feature can mean that the first feature is directly above or diagonally above the second feature, or simply that the first feature is at a higher horizontal level than the second feature. "Below," "below," and "under" the second feature can mean that the first feature is directly below or diagonally below the second feature, or simply that the first feature is at a lower horizontal level than the second feature.

[0081] In this utility model, the terms "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., refer to a specific feature, structure, material, or characteristic described in connection with that embodiment or example, which is included in at least one embodiment or example of this utility model. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples. Moreover, without contradiction, those skilled in the art can combine and integrate the different embodiments or examples described in this specification, as well as the features of different embodiments or examples.

[0082] Although the above embodiments have been shown and described, it is understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Any changes, modifications, substitutions and variations made to the above embodiments by those skilled in the art are within the protection scope of the present invention.

Claims

1. A volute, characterized in that, include: The volute body (1) is provided with an impeller cavity (13) and a first air duct (11); The first volute tongue (2) and the first protrusion (3) are provided at the connection position between the first air duct (11) and the impeller cavity (13), and the first protrusion (3) is provided on the inner peripheral wall of the impeller cavity (13), and the first protrusion (3) is arranged adjacent to the first volute tongue (2).

2. The volute according to claim 1, characterized in that, The first protrusion (3) includes a first surface (31), which is located on the side of the first protrusion (3) near the first volute tongue (2). One side of the width direction of the first surface (31) is in contact with the inner peripheral wall of the impeller cavity (13). The length direction of the first surface (31) has an angle α with the axial end face of the volute body (1).

3. The volute according to claim 2, characterized in that, 5°≤α≤85°。 4. The volute according to claim 1, characterized in that, The first protrusion (3) includes a first surface (31), which is located on the side of the first protrusion (3) near the first volute tongue (2). One side of the width direction of the first surface (31) is connected to the inner peripheral wall of the impeller cavity (13). The extension path of the first surface (31) in its length direction is a straight line or a curve.

5. The volute according to claim 1, characterized in that, The first protrusion (3) includes a first surface (31), which is located on the side of the first protrusion (3) near the first volute tongue (2). One side of the width direction of the first surface (31) is in contact with the inner peripheral wall of the impeller cavity (13). The first surface (31) includes a plurality of bent surfaces (311), which are arranged sequentially along the length direction of the first surface (31).

6. The volute according to any one of claims 2-5, characterized in that, The shortest distance between the first surface (31) and the first volute tongue (2) is L1, where 0mm≤L1≤40mm.

7. The volute according to any one of claims 2-5, characterized in that, The width dimension of the first surface (31) is L2, wherein 3mm≤L2≤20mm.

8. The volute according to claim 1, characterized in that, The first protrusion (3) extends along a first direction, and in the first direction, the first protrusion (3) maintains a constant cross-section orthogonal to the first direction.

9. The volute according to claim 1, characterized in that, The volute body (1) includes an end plate (15) and a side plate (16), the end plate (15) and the side plate (16) forming the impeller cavity (13), the end plate (15) is used to install the impeller (6), the first protrusion (3) is provided on the side plate (16), the side plate (16) has a first side (161) close to the end plate (15) and a second side (162) away from the end plate (15), and the cross-section of the first protrusion (3) gradually decreases in the direction from the first side (161) to the second side (162).

10. The volute according to claim 9, characterized in that, The first protrusion (3) includes a first surface (31), a second surface (32) and a third surface (33). The second surface (32) is parallel to the inner peripheral wall of the side plate (16). The first surface (31) is located on the side of the second surface (32) close to the first volute tongue (2). The third surface (33) is located on the side of the second surface (32) away from the first volute tongue (2).

11. The volute according to claim 10, characterized in that, In the projection plane orthogonal to the second surface (32), the outer periphery of the second surface (32) is a triangle or a trapezoid.

12. The volute according to claim 9, characterized in that, The first protrusion (3) is integrally formed with the volute body (1), and the side plate (16) is provided with a draft groove (14) on the side away from the first protrusion (3).

13. The volute according to any one of claims 1-12, characterized in that, The volute body (1) is provided with a second air duct (12). The first air duct (11) and the second air duct (12) are arranged circumferentially around the impeller cavity (13). The volute also includes a second volute tongue (4) and a second protrusion (5). The second volute tongue (4) is located at the connection position between the second air duct (12) and the impeller cavity (13). The second protrusion (5) is located radially on the inner circumferential wall of the impeller cavity (13) and is arranged adjacent to the second volute tongue (4).

14. The volute according to claim 13, characterized in that, The outer dimensions of the first air duct (11) are the same as those of the second air duct (12), and the outer dimensions of the first protrusion (3) are the same as those of the second protrusion (5).

15. A fan, characterized in that, include: The volute is the volute according to any one of claims 1-14; Impeller (6), the impeller (6) is disposed in the impeller cavity (13).

16. An air supply device, characterized in that, Includes the wind turbine as described in claim 15.

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