Volute device

Abstract

The utility model provides a volute device which is used for a fan system of a range hood. The volute device comprises a volute, a handle and a sound absorbing material layer, the handle is installed on the outer surface of the annular wall of the volute and comprises a first fixing part, and a first gap is formed between the first fixing part and the outer surface of the annular wall; the outer surface of the annular wall is coated with the sound-absorbing material layer, so that the space in an air duct of the fan system is not occupied, and the design and arrangement difficulty of the sound-absorbing material layer is reduced. Part of the sound-absorbing material layer is arranged in the first gap, and the two end faces of the sound-absorbing material layer abut against the outer surface of the annular wall and the inner surface of the first fixing part correspondingly. According to the volute device, the original handle of the volute device is used for compressing the sound-absorbing material layer, the sound-absorbing material layer and the volute are fixed, the cost for fixing the sound-absorbing material layer is reduced, meanwhile, the compressing mode ensures that the sound-absorbing material layer is tightly attached to the annular wall, the sound-absorbing effect of the sound-absorbing material layer can be exerted to the maximum extent, and the noise reduction effect is improved.

Description

Technical Field

[0001] The utility model relates to the field of range hoods, in particular to a volute device. Background Art

[0002] In order to improve the oil fume absorption effect of the range hood, the air volume of the range hood is made larger, which leads to the increase of the noise generated when the range hood is working, which affects the user's cooking experience to a certain extent. However, simply relying on the structural optimization of the fan system in the range hood to reduce the noise of the whole machine has little effect. Therefore, passive noise reduction devices are also needed to absorb and reduce noise.

[0003] Among them, integrated stoves are commonly used household appliances in home kitchens. They integrate functions such as range hoods, stoves, and disinfection cabinets, saving kitchen space and becoming more and more popular among users. However, due to the small size of the integrated stove air duct, the design and layout of the sound absorption and noise reduction structure are often difficult, and the noise reduction cost-effectiveness is low. Utility Model Content

[0004] The technical problem to be solved by the utility model is to provide a volute device in order to overcome the deficiencies in the above-mentioned prior art.

[0005] The utility model solves the above technical problems through the following technical solutions:

[0006] A volute device is used for a fan system of a range hood, the volute device comprising a volute, a handle and a sound absorbing material layer;

[0007] The volute comprises a front cover plate, a rear cover plate and an annular wall, the front cover plate and the rear cover plate are spaced apart along a first direction, and the annular wall is connected between the front cover plate and the rear cover plate;

[0008] The handle is mounted on the outer surface of the annular wall, and the handle comprises a first fixing portion, wherein the first fixing portion and the outer surface of the annular wall form a first gap in a second direction, and the second direction is a thickness direction of the annular wall;

[0009] The sound absorbing material layer covers the outer surface of the annular wall, a portion of the sound absorbing material layer is arranged in the first gap, and both end surfaces of the sound absorbing material layer in the second direction are respectively in contact with the outer surface of the annular wall and the inner surface of the first fixing portion.

[0010] In this solution, the sound-absorbing material layer covers the outer surface of the annular wall, does not occupy the space in the air duct of the fan system, and reduces the difficulty of designing and arranging the sound-absorbing material layer. Moreover, since the volute is the main noise source of the fan system, the sound-absorbing material layer directly covers the outer surface of the annular wall, that is, the volute is directly subjected to noise reduction treatment, which ensures the noise reduction effect and improves the noise reduction cost performance. The sound-absorbing material layer is pressed by the original handle of the volute device to achieve the fixation of the sound-absorbing material layer and the volute, which reduces the cost of fixing the sound-absorbing material layer. At the same time, the pressing method ensures that the sound-absorbing material layer is tightly fitted with the annular wall, which can maximize the sound absorption effect of the sound-absorbing material layer and improve the noise reduction effect.

[0011] Preferably, the width of the first fixing portion in the first direction is greater than or equal to the width of the annular wall in the first direction;

[0012] The handle further includes a first connecting portion, the first connecting portion is connected to two ends of the first fixing portion in a first direction, and the first connecting portion is respectively connected to the front cover plate and the rear cover plate.

[0013] In this solution, the above arrangement can prevent the first connecting portion from occupying space on the annular wall, so that the width of the first gap in the first direction is larger, which facilitates the installation of the sound-absorbing material layer.

[0014] Preferably, the sound-absorbing material layer comprises a plurality of material layer units, the plurality of material layer units are arranged at intervals along the circumference of the annular wall, at least one handle is arranged between two adjacent material layer units, and the ends of the two material layer units facing each other are both arranged in the first gap.

[0015] In this solution, the above arrangement facilitates the installation of the sound absorbing material layer and reduces the difficulty of arranging the sound absorbing material layer in the first gap.

[0016] Preferably, the sound absorbing material layer is made of a flexible material, and the sound absorbing material layer can be compressed in the second direction.

[0017] In this solution, the above arrangement reduces the dimensional accuracy requirement of the first gap and reduces the difficulty of installation.

[0018] Preferably, the thickness of the sound absorbing material layer in the second direction is 20-22 mm, and the height of the first gap in the second direction is 13-18 mm.

[0019] In this solution, since the sound absorbing material layer is compressible, the above arrangement can achieve the compression of the sound absorbing material layer by the handle while ensuring the compression strength to prevent the sound absorbing material layer from shaking after being compressed.

[0020] Preferably, the volute device also includes a fixing member, which is installed on the outer surface of the annular wall, and the fixing member includes a second fixing portion, and the second fixing portion and the outer surface of the annular wall form a second gap in the second direction, and part of the sound-absorbing material layer is arranged in the second gap, and the two end surfaces of the sound-absorbing material layer in the second direction are respectively abutted against the outer surface of the annular wall and the inner surface of the second fixing portion.

[0021] In this solution, the fixing piece is used to press the sound absorbing material layer onto the annular wall to prevent the portion of the sound absorbing material layer that is not pressed by the handle from collapsing, thereby improving the noise reduction effect.

[0022] Preferably, the thickness of the sound absorbing material layer in the second direction is 20-22 mm, and the height of the second gap in the second direction is 13-18 mm.

[0023] In this solution, since the sound absorbing material layer is compressible, the above arrangement can realize that the fixing member compresses the sound absorbing material layer while ensuring the compression strength to prevent the sound absorbing material layer from shaking after being compressed.

[0024] Preferably, the fixing member is an "X"-shaped structure, and the fixing member further comprises a second connecting portion, wherein the second connecting portion is connected to two ends of the second fixing portion in the first direction;

[0025] The length of the fixing member in the first direction is less than or equal to the width of the annular wall in the first direction. The sound absorbing material layer is provided with notches at both ends in the first direction. The second connecting portion passes through the notches and abuts against the annular wall.

[0026] In this solution, the notch is used to avoid the second connecting portion so that the second connecting portion can be directly connected to the annular wall, thereby facilitating the fixation of the fixing member and the annular wall.

[0027] Preferably, the length of the fixing member in the first direction is equal to the width of the annular wall in the first direction, and the length of the second connecting portion on one side in the first direction is 8-10 mm.

[0028] In this solution, the above arrangement ensures that the second connection part has sufficient connection area to connect with the annular wall, and prevents the second connection part from occupying too much space and squeezing out the space of the first fixing part, thereby ensuring the size of the sound-absorbing material layer and improving the noise reduction effect.

[0029] Preferably, the angle of the bend of the fixing member is 115°-120°.

[0030] In this solution, the bending angle of the bending part of the "X"-shaped fixing piece will affect the strength and service life of the fixing piece. The above-mentioned setting can improve the strength of the fixing piece, prevent the fixing piece from being broken due to the vibration of the fan system during use, and improve the reliability of the fixing.

[0031] The positive and progressive effect of the utility model is that the sound-absorbing material layer covers the outer surface of the annular wall, does not occupy the space in the air duct of the fan system, and reduces the difficulty of designing and arranging the sound-absorbing material layer. Moreover, since the volute is the main noise source of the fan system, the sound-absorbing material layer directly covers the outer surface of the annular wall, that is, the volute is directly subjected to noise reduction treatment, thereby ensuring the noise reduction effect and improving the noise reduction cost performance. The sound-absorbing material layer is pressed by the original handle of the volute device to achieve the fixation of the sound-absorbing material layer and the volute, thereby reducing the cost of fixing the sound-absorbing material layer. At the same time, the pressing method ensures that the sound-absorbing material layer is tightly fitted with the annular wall, which can maximize the sound absorption effect of the sound-absorbing material layer and improve the noise reduction effect. BRIEF DESCRIPTION OF THE DRAWINGS

[0032] Figure 1 It is a schematic diagram of the three-dimensional structure of a volute device according to one embodiment of the utility model.

[0033] Figure 2 Another three-dimensional structural schematic diagram of the volute device according to one embodiment of the utility model.

[0034] Figure 3 This is a schematic structural diagram of the coordination of a volute, a handle, and a fixing member in one embodiment of the utility model.

[0035] Figure 4 The figure is a three-dimensional structural schematic diagram of a volute according to an embodiment of the utility model.

[0036] Figure 5 It is a schematic diagram of the three-dimensional structure of a handle according to an embodiment of the utility model.

[0037] Figure 6 The figure is a schematic diagram of the internal structure of a volute according to an embodiment of the present invention.

[0038] Figure 7 It is a three-dimensional structural schematic diagram of a fixing member according to an embodiment of the utility model.

[0039] Figure 8 It is a schematic diagram of the three-dimensional structure of a material layer unit according to an embodiment of the utility model.

[0040] Description of reference numerals:

[0041] Snail 1

[0042] Front cover 11

[0043] Rear cover 12

[0044] Ring wall 13

[0045] Oil leakage hole 14

[0046] Handle 2

[0047] The first fixing portion 21

[0048] First connection portion 22

[0049] Handle 23

[0050] Sound absorbing material layer 3

[0051] Material layer unit 31

[0052] Avoidance space 32

[0053] Gap 33

[0054] Fixing 4

[0055] The second fixing portion 41

[0056] Second connection portion 42

[0057] Profiled structure 43

[0058] Shielding 5

[0059] First gap 61

[0060] Second gap 62

[0061] Impeller 7 DETAILED DESCRIPTION

[0062] A preferred embodiment is given below, and the present invention is described more clearly and completely in conjunction with the accompanying drawings.

[0063] like Figure 1 and Figure 2 As shown, this embodiment discloses a volute device, which is used in the fan system of a range hood, and is particularly suitable for the fan system of a range hood of an integrated stove.

[0064] Specifically, Figure 1 and Figure 2 As shown, the volute device includes a volute 1 , a handle 2 and a sound absorbing material layer 3 .

[0065] like Figure 3 and Figure 4 As shown, the volute 1 includes a front cover plate 11, a rear cover plate 12 and an annular wall 13. The front cover plate 11 and the rear cover plate 12 are arranged along a first direction ( Figure 1The annular wall 13 is connected between the front cover plate 11 and the rear cover plate 12, and the two ends of the annular wall 13 in the first direction are sealed and connected to the front cover plate 11 and the rear cover plate 12 on the corresponding side. The impeller 7 in the fan system is installed in the volute 1. Since the impeller generates vibration when rotating, and the vibration is transmitted to the volute 1, the volute 1 becomes the main source of aerodynamic noise of the existing fan system.

[0066] like Figure 2 and Figure 4 As shown, the volute 1 is provided with an oil leakage hole 14, and the oil in the volute 1 can flow out from the oil leakage hole 14 to the outside of the volute 1, so as to facilitate the collection of the oil. The outer peripheral side of the oil leakage hole 14 can be further blocked by a shielding member 5 to prevent foreign objects outside the volute 1 from blocking the oil leakage hole 14, thereby ensuring the normal discharge of the oil. Among them, the shielding member 5 in this embodiment is a "J"-shaped structure. In other alternative embodiments, the shielding member 5 can also be other shapes, without blocking the oil leakage hole 14, and ensuring the normal discharge of the oil.

[0067] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the handle 2 is installed on the outer surface of the annular wall 13 to facilitate the staff to control the entire volute device, to facilitate the implementation of operations such as lifting the volute device and adjusting the position of the volute device. Specifically, the handle 2 in this embodiment includes a first fixing portion 21, a first connecting portion 22 and a handle portion 23.

[0068] like Figure 1 , Figure 2 , Figure 5 and Figure 6 As shown, the first connection portion 22 is connected to both ends of the first fixing portion 21 in the first direction, the handle portion 23 is connected to both ends of the first fixing portion 21 in the circumferential direction of the annular wall 13, the handle 2 is connected to the volute 1 through the first connection portion 22, and the handle portion 23 is used for the staff to hold.

[0069] like Figure 1 , Figure 2 and Figure 6 As shown, the first fixing portion 21 and the outer surface of the annular wall 13 form a first gap 61 in the second direction (the second direction is the thickness direction of the annular wall 13), the sound absorbing material layer 3 covers the outer surface of the annular wall 13, and part of the sound absorbing material layer 3 is arranged in the first gap 61. The first fixing portion 21 can press the sound absorbing material layer 3 onto the annular wall 13, and the two end surfaces of the sound absorbing material layer 3 in the second direction are respectively in contact with the outer surface of the annular wall 13 and the inner surface of the first fixing portion 21.

[0070] In this embodiment, the sound absorbing material layer 3 covers the outer surface of the annular wall 13, does not occupy the space in the air duct of the fan system, and reduces the difficulty of designing and arranging the sound absorbing material layer 3. In addition, since the volute 1 is the main source of aerodynamic noise of the fan system, the sound absorbing material layer 3 directly covers the outer surface of the annular wall 13, that is, the volute 1 is directly subjected to noise reduction treatment, thereby ensuring the noise reduction effect and improving the noise reduction cost performance.

[0071] Furthermore, the sound absorbing material layer 3 is arranged on the side of the handle 2 facing the annular wall 13 in the second direction, and is pressed by the original handle 2 of the volute device to achieve the fixation of the sound absorbing material layer 3 and the volute 1, thereby reducing the cost of separately setting a fixing structure to fix the sound absorbing material layer 3. At the same time, the pressing method ensures that the sound absorbing material layer 3 is closely attached to the annular wall 13, which can maximize the sound absorption effect of the sound absorbing material layer 3 and improve the noise reduction effect.

[0072] The sound absorbing material layer 3 can be inserted into the first gap 61 after the handle 2 is installed on the volute 1 , or the sound absorbing material layer 3 can be wrapped around the annular wall 13 before the handle 2 is installed.

[0073] Furthermore, in this embodiment, the width of the first fixing portion 21 in the first direction is equal to the width of the annular wall 13 in the first direction; the first connecting portions 22 located on both sides of the first fixing portion 21 in the first direction are connected to the front cover plate 11 and the rear cover plate 12, so as to avoid the first connecting portions 22 occupying the space on the annular wall 13, so as to make the width of the first gap 61 in the first direction larger, and facilitate the installation of the sound absorbing material layer 3. In addition, the first connecting portions 22 can also limit the movement of the sound absorbing material layer 3 in the first direction, prevent the sound absorbing material layer 3 from shifting, and ensure the noise reduction effect.

[0074] The first connection portion 22 can be connected to the front cover plate 11 and the rear cover plate 12 by means of threaded connection or the like.

[0075] In other alternative embodiments, the width of the first fixing portion 21 in the first direction may also be slightly greater than the width of the annular wall 13 in the first direction, and the first connecting portion 22 may be slightly inclined toward the front cover plate 11 or the rear cover plate 12 to achieve the above-mentioned effect.

[0076] Furthermore, the sound absorbing material layer 3 is provided with an escape space 32 communicating with the oil leakage hole 14 to facilitate the discharge of oil.

[0077] like Figure 1 , Figure 2 and Figure 7 As shown, the volute device further comprises a fixing member 4, which is mounted on the outer surface of the annular wall 13, and the auxiliary handle 2 presses the sound absorbing material layer 3 onto the annular wall 13. Specifically, the fixing member 4 comprises a second fixing portion 41 and a second connecting portion 42.

[0078] like Figure 1 , Figure 2 and Figure 7 As shown, the second fixing portion 41 and the outer surface of the annular wall 13 form a second gap 62 in the second direction, and part of the sound absorbing material layer 3 is arranged in the second gap 62. The second fixing portion 41 can press the sound absorbing material layer 3 onto the annular wall 13, and the two end surfaces of the sound absorbing material layer 3 in the second direction are respectively in contact with the outer surface of the annular wall 13 and the inner surface of the second fixing portion 41. The fixing member 4 is used to press the sound absorbing material layer 3 onto the annular wall 13 to prevent the part of the sound absorbing material layer 3 that is not pressed by the handle 2 from collapsing, thereby improving the noise reduction effect.

[0079] like Figure 7 and Figure 8 As shown, the fixing member 4 is a "X"-shaped structure, the second connecting portion 42 is connected to the two ends of the second fixing portion 41 in the first direction, and the fixing member 4 is connected to the volute 1 through the second connecting portion 42. In this embodiment, the length of the fixing member 4 in the first direction is equal to the width of the annular wall 13 in the first direction, and the sound absorbing material layer 3 is provided with notches 33 at both ends in the first direction, and the second connecting portion 42 passes through the notches 33 and abuts against the annular wall 13. The notches 33 are used to avoid the second connecting portion 42, so that the second connecting portion 42 can be directly connected to the annular wall 13, which facilitates the fixing of the fixing member 4 and the annular wall 13.

[0080] The second connection portion 42 can be connected to the annular wall 13 by means of threaded connection or the like.

[0081] In this embodiment, the first connection parts 22 located on both sides of the first fixing part 21 in the first direction are symmetrical structures, and the length of the single-sided second connection part 42 in the first direction is 9 mm. On the one hand, it ensures that the second connection part 42 has a sufficient connection area to connect with the annular wall 13, and on the other hand, it can also prevent the second connection part 42 from occupying too much space and squeezing the space of the first fixing part 21, thereby ensuring the size of the sound-absorbing material layer 3 and improving the noise reduction effect.

[0082] In other alternative embodiments, the first connecting portions 22 on both sides of the first fixing portion 21 in the first direction may also be asymmetric, and the length of the single-sided second connecting portion 42 in the first direction may also be other values, preferably 8-10 mm, for example, 8 mm, 10 mm, etc.

[0083] Furthermore, the fixing member 4 is a cross-shaped bending member, and the angles of the bending parts of the fixing member 4 are the same, which is 118°, thereby improving the strength and service life of the fixing member 4, preventing the fixing member 4 from being broken due to the vibration of the fan system during use, and improving the reliability of the fixation.

[0084] In other alternative embodiments, the angle of the bend of the fixing member 4 may also be selected to have other values, preferably in the range of 115°-120°, for example, specifically, values ​​such as 115°, 116°, 117°, 119°, 120°, etc. may be selected.

[0085] Furthermore, a press-type structure 43 may be provided at one end of the second fixing portion 41 in the first direction away from the annular wall 13 to improve the anti-deformation capability of the fixing member 4. The press-type structure 43 is a groove structure formed by stamping or the like.

[0086] The material of the sound absorbing material layer 3 in this embodiment is a flexible material with compressibility, and the sound absorbing material layer 3 can be compressed in the second direction to be conveniently inserted into the first gap 61. The height dimension requirement of the first gap 61 in the second direction can be reduced, thereby reducing the difficulty of installation.

[0087] Specifically, in this embodiment, the thickness of the sound absorbing material layer 3 in the second direction is 21 mm, the height of the first gap 61 in the second direction is 15 mm, and the height of the second gap 62 in the second direction is 15 mm. Since the sound absorbing material layer 3 is compressible, the thickness of the sound absorbing material layer 3 in the second direction is greater than the height of the first gap 61 in the second direction, so that the handle 2 can press the sound absorbing material layer 3 while ensuring the pressing strength, and preventing the sound absorbing material layer 3 from shaking after being pressed.

[0088] In other alternative embodiments, the thickness of the sound absorbing material layer 3 in the second direction may also be selected to be other values, preferably in the range of 20-22 mm, for example, specifically, values ​​such as 20 mm and 22 mm may be selected.

[0089] In other alternative embodiments, the height of the first gap 61 in the second direction may also be selected to be other values, preferably in the range of 13-18 mm, for example, specifically 13 mm, 14 mm, 16 mm, 17 mm, 18 mm and the like.

[0090] In other alternative embodiments, the height of the second gap 62 in the first direction may also be selected to be other values, preferably in the range of 13-18 mm, for example, specifically 13 mm, 14 mm, 16 mm, 17 mm, 18 mm and the like.

[0091] Furthermore, if Figure 1 and Figure 2As shown, there are two handles 2 in this embodiment, and the structures of the two handles 2 are the same. The sound absorbing material layer 3 includes two material layer units 31, and the two material layer units 31 are arranged at intervals along the circumferential direction of the annular wall 13. One of the handles 2 is fixed to one end of one of the material layer units 31 away from the other material layer unit 31, and the other handle 2 is arranged between two adjacent material layer units 31. The ends of the two material layer units 31 facing each other are both arranged in the first gap 61, which facilitates the installation of the sound absorbing material layer 3 and reduces the difficulty of arranging the sound absorbing material layer 3 in the first gap 61.

[0092] In other alternative embodiments, the number of handles 2 and the number of material layer units 31 in the sound absorbing material layer 3 may be other. For example, only one handle 2 may be included, and the other sound absorbing material layers 3 may be fixed by the fixing member 4; or a larger number of handles 2 may be fixed on the volute 1; or the sound absorbing material layer 3 may be a whole and not divided into a plurality of material layer units 31; or the sound absorbing material layer 3 may be divided into a larger number of material layer units 31.

[0093] In other alternative embodiments, when there are multiple handles 2, the structures of the multiple handles 2 may be the same or different.

[0094] In other alternative embodiments, the handle 2 can be installed at the end of the sound absorbing material layer 3, or can be installed at the middle of the sound absorbing material layer 3, and the specific design is based on actual needs.

[0095] In the description of the present invention, it should be understood that the terms "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings of the devices or components, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or components referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present invention.

[0096] Although the specific implementations of the utility model are described above, those skilled in the art should understand that this is only an example, and the protection scope of the utility model is defined by the attached claims. Those skilled in the art can make various changes or modifications to these implementations without departing from the principle and essence of the utility model, but these changes and modifications fall within the protection scope of the utility model.

Claims

1. A volute device, used in a fan system of a range hood, characterized in that: The volute device comprises a volute, a handle and a sound absorbing material layer; The volute comprises a front cover plate, a rear cover plate and an annular wall, the front cover plate and the rear cover plate are spaced apart along a first direction, and the annular wall is connected between the front cover plate and the rear cover plate; The handle is mounted on the outer surface of the annular wall, and the handle comprises a first fixing portion, wherein the first fixing portion and the outer surface of the annular wall form a first gap in a second direction, and the second direction is a thickness direction of the annular wall; The sound absorbing material layer covers the outer surface of the annular wall, a portion of the sound absorbing material layer is arranged in the first gap, and both end surfaces of the sound absorbing material layer in the second direction are respectively in contact with the outer surface of the annular wall and the inner surface of the first fixing portion.

2. The volute device according to claim 1, characterized in that: The width of the first fixing portion in the first direction is greater than or equal to the width of the annular wall in the first direction; The handle further includes a first connecting portion, the first connecting portion is connected to two ends of the first fixing portion in a first direction, and the first connecting portion is respectively connected to the front cover plate and the rear cover plate.

3. The volute device according to claim 1, characterized in that: The sound-absorbing material layer includes a plurality of material layer units, and the plurality of material layer units are arranged at intervals along the circumference of the annular wall. At least one handle is arranged between two adjacent material layer units, and ends of the two material layer units facing each other are both arranged in the first gap.

4. The volute device according to claim 1, characterized in that: The sound absorbing material layer is made of a flexible material, and the sound absorbing material layer can be compressed in the second direction.

5. The volute device according to claim 4, characterized in that: The thickness of the sound absorbing material layer in the second direction is 20-22 mm, and the height of the first gap in the second direction is 13-18 mm.

6. The volute device according to claim 4, characterized in that: The volute device also includes a fixing member, which is installed on the outer surface of the annular wall. The fixing member includes a second fixing portion, and the second fixing portion and the outer surface of the annular wall form a second gap in the second direction. Part of the sound absorbing material layer is arranged in the second gap, and both end surfaces of the sound absorbing material layer in the second direction are respectively in contact with the outer surface of the annular wall and the inner surface of the second fixing portion.

7. The volute device according to claim 6, characterized in that: The thickness of the sound absorbing material layer in the second direction is 20-22 mm, and the height of the second gap in the second direction is 13-18 mm.

8. The volute device according to claim 6, characterized in that: The fixing member is an "X"-shaped structure, and the fixing member further comprises a second connecting portion, wherein the second connecting portion is connected to two ends of the second fixing portion in the first direction; The length of the fixing member in the first direction is less than or equal to the width of the annular wall in the first direction. The sound absorbing material layer is provided with notches at both ends in the first direction. The second connecting portion passes through the notches and abuts against the annular wall.

9. The volute device according to claim 8, characterized in that: The length of the fixing member in the first direction is equal to the width of the annular wall in the first direction, and the length of the second connecting portion on one side in the first direction is 8-10 mm.

10. The volute device according to claim 8, characterized in that: The angle of the bending part of the fixing piece is 115°-120°.

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