Air bellow device and range hood

Abstract

The utility model provides an air bellow device and a range hood, and relates to the technical field of kitchen appliances, the air bellow device provided by the utility model comprises a shell and a fan assembly, a noise reduction diversion channel is arranged in the shell, one side of an inlet of the noise reduction diversion channel is connected with a smoke collecting hood, and the other side of the inlet of the noise reduction diversion channel is connected with the fan assembly; the fan assembly is arranged on one side of an outlet of the noise reduction flow guide channel. A sound absorption structure is arranged on the inner wall of the noise reduction flow guide channel; and the cross sectional area of a flow channel of the noise reduction flow guide channel is gradually reduced in the direction from the inlet to the outlet of the noise reduction flow guide channel.

Description

Technical Field

[0001] The utility model relates to the technical field of kitchen appliances, in particular to a bellows device and a range hood. Background Art

[0002] In daily life, range hoods are widely used. However, the noise produced by range hoods when they are working is unavoidable.

[0003] At present, the fan system of the range hood is the main source of noise. How to reduce the noise of the range hood and create a comfortable and quiet kitchen home environment has put forward higher requirements on the design and production technology of the range hood. Utility Model Content

[0004] The utility model aims to provide a bellows device and a range hood to alleviate the technical problem of high working noise of the existing range hood.

[0005] In a first aspect, the utility model provides a bellows device, comprising: a housing and a fan assembly, wherein a noise reduction guide channel is provided in the housing, and the fan assembly is provided at one side of the outlet of the noise reduction guide channel, so that oil smoke flows from the inlet of the noise reduction guide channel to the outlet thereof;

[0006] The inner wall of the noise reduction and diversion channel is provided with a sound absorbing structure;

[0007] From the inlet of the noise reduction guide channel toward the outlet, the cross-sectional area of ​​the flow channel of the noise reduction guide channel gradually decreases.

[0008] Furthermore, the bellows device also includes a guide member, which is arranged in the shell. There is a gap between the outer wall of the guide member and the inner wall of the shell, and the gap forms a noise reduction guide channel.

[0009] Further, the fan assembly includes two inlets spaced apart and facing oppositely along the first direction;

[0010] The guide member is located below the fan assembly; the guide member comprises a first side wall and a second side wall with gradually increasing spacing from top to bottom, and the first side wall and the second side wall are spaced apart along a first direction;

[0011] The housing comprises a first side inner wall and a second side inner wall spaced apart along a first direction, wherein the first side inner wall is close to the first side wall and away from the second side wall; the second side inner wall is close to the second side wall and away from the first side wall;

[0012] The first side wall is spaced apart from the first side inner wall to form a noise reduction guide channel; the second side wall is spaced apart from the second side inner wall to form another noise reduction guide channel, and the two noise reduction guide channels correspond to the two inlets of the fan assembly respectively.

[0013] Furthermore, the downward projection of the fan assembly falls within the guide member.

[0014] Furthermore, the guide member includes a bottom plate connected between the first side wall and the second side wall, and from top to top, the bottom plate is inclined backwards to guide the oil stains toward the rear side of the shell.

[0015] Furthermore, the housing further comprises a third side inner wall and a fourth side inner wall, wherein the first side inner wall, the second side inner wall, the third side inner wall and the fourth side inner wall are connected end to end in sequence;

[0016] The sound absorbing structure is disposed on at least one of the first side wall, the second side wall, the bottom plate, the first side inner wall, the second side inner wall, the third side inner wall and the fourth side inner wall.

[0017] Furthermore, the sound absorbing structure includes a porous sound absorbing box and a sound absorbing material located in the porous sound absorbing box.

[0018] Furthermore, the outer shell includes a cylinder, a surrounding plate and a cover plate, and a notch communicating with the lower end opening of the cylinder is provided on the front wall of the cylinder;

[0019] The left side or the right side of the cylinder is open;

[0020] The enclosure includes a first plate portion and a second plate portion connected to each other, the free end of the first plate portion is connected to the side of the cylinder relative to the opening, and the free end of the second plate portion is connected to the rear side of the cylinder, the first plate portion is used to block the gap, and the second plate portion is used to block the lower part of the opening; the cover plate is used to block the remaining upper part of the opening.

[0021] Furthermore, the front end of the flow guide is connected to the first plate portion, and the rear end of the flow guide is connected to the rear side surface of the cylinder.

[0022] Furthermore, the shell includes a cylinder and a cover plate, and the left side or the right side of the cylinder is open;

[0023] The cover plate is connected to the cylinder, and the cover plate is used to block the opening. The cylinder and the cover plate surround the upper opening and the lower opening of the shell;

[0024] The front side surface of the cylinder includes a vertical plane located above and an inclined surface located below the vertical plane. From top to bottom, the inclined surface is inclined toward the rear side, and the vertical plane and the inclined surface are integrally formed.

[0025] In a second aspect, the utility model provides a range hood comprising the above-mentioned bellows device.

[0026] The utility model has at least the following advantages or beneficial effects:

[0027] The bellows device provided by the utility model comprises: a shell and a fan assembly, a noise reduction guide channel is arranged in the shell, and the fan assembly is arranged on the outlet side of the noise reduction guide channel so that the oil smoke flows from the inlet of the noise reduction guide channel to its outlet; the inner wall of the noise reduction guide channel is provided with a sound absorbing structure; from the inlet of the noise reduction guide channel toward the outlet direction, the cross-sectional area of ​​the flow channel of the noise reduction guide channel gradually decreases.

[0028] When the fan assembly is working, the oil smoke in the smoke hood passes through the noise reduction guide channel. Since the cross-sectional area of ​​the flow channel of the noise reduction guide channel gradually decreases, according to the principle of Venturi effect, when the oil smoke flows through the reduced flow section, the flow velocity of the oil smoke will increase, and its kinetic energy will be accelerated, which is conducive to the suction of the oil smoke and improves the oil smoke suction effect of the range hood. At the same time, since the inner wall of the noise reduction guide channel is provided with a sound-absorbing structure, the noise value can be effectively reduced when the oil smoke passes through, thereby achieving the effect of noise reduction and silencing of the whole machine.

[0029] The range hood provided by the utility model includes the above-mentioned bellows device. Since the range hood provided by the utility model adopts the above-mentioned bellows device, the range hood provided by the utility model also has the advantages of the bellows device. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] In order to more clearly illustrate the specific implementation methods of the utility model or the technical solutions in the prior art, the drawings required for use in the specific implementation methods or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some implementation methods of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0031] Figure 1 A schematic diagram of a bellows device provided in an embodiment of the utility model;

[0032] Figure 2 A schematic diagram of the internal structure of a bellows device provided in an embodiment of the utility model;

[0033] Figure 3 A schematic diagram of a bellows device provided by an embodiment of the utility model with the outer shell removed;

[0034] Figure 4 A schematic diagram of a fan assembly of a bellows device provided in an embodiment of the utility model;

[0035] Figure 5A schematic diagram of a cylinder of a bellows device provided in an embodiment of the utility model;

[0036] Figure 6 A schematic diagram of the bellows device provided in an embodiment of the utility model after the cylinder and the enclosure are connected (the cover plate is not installed);

[0037] Figure 7 A side view of the internal structure of the bellows device provided by an embodiment of the utility model;

[0038] Figure 8 A schematic diagram of a flow guide member of a bellows device provided in an embodiment of the utility model;

[0039] Fig. 9 A side view of a flow guide member of a bellows device provided in an embodiment of the utility model;

[0040] Fig.10 A front view of a flow guide member of a bellows device provided in an embodiment of the utility model;

[0041] Fig.11 An exploded view of another shell of a bellows device provided in an embodiment of the utility model.

[0042] icon:

[0043] 110 - air outlet plate; 120 - cylinder; 121 - notch; 122 - opening; 130 - enclosure; 131 - first plate portion; 132 - second plate portion; 140 - cover plate;

[0044] 200 - fan assembly;

[0045] 300-noise reduction diversion channel;

[0046] 400 - sound absorbing structure;

[0047] 500 - flow guide; 510 - first side wall; 520 - second side wall; 530 - bottom plate. DETAILED DESCRIPTION

[0048] In order to make the purpose, technical scheme and advantages of the embodiments of the utility model clearer, the technical scheme in the embodiments of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiments of the utility model. Obviously, the described embodiments are part of the embodiments of the utility model, not all of the embodiments. Generally, the components of the embodiments of the utility model described and shown in the drawings here can be arranged and designed in various different configurations.

[0049] Therefore, the following detailed description of the embodiments of the present invention provided in the accompanying drawings is not intended to limit the scope of the present invention to be protected, but merely represents selected embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0050] It should be noted that similar reference numerals and letters denote similar items in the following drawings, and therefore, once an item is defined in one drawing, further definition and explanation thereof is not required in subsequent drawings.

[0051] In the description of the present utility model, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inside", "outside", etc. indicate the orientation or position relationship based on the orientation or position relationship shown in the accompanying drawings, or the orientation or position relationship in which the utility model product is usually placed when in use, which is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element 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 utility model. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description, and cannot be understood as indicating or implying relative importance.

[0052] In addition, the terms "horizontal", "vertical" and the like do not mean that the components are required to be absolutely horizontal or suspended, but can be slightly tilted. For example, "horizontal" only means that its direction is more horizontal than "vertical", and does not mean that the structure must be completely horizontal, but can be slightly tilted.

[0053] In the description of the present invention, it is also necessary to explain that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0054] like Figure 1 - Figure 3 As shown, the bellows device provided by the utility model is installed above the smoke hood, and includes: a housing and a fan assembly 200, and the fan assembly 200 is located inside the housing. An air outlet plate 110 is installed in the housing, and the outlet of the fan assembly 200 can be connected to the air outlet plate 110 by screws.

[0055] like Figure 2As shown, a noise reduction guide channel 300 is provided in the shell, and the inlet side of the noise reduction guide channel 300 is connected to the smoke hood or the shell, and the oil smoke sucked by the smoke hood enters the noise reduction guide channel 300 through the inlet, and the fan assembly 200 is arranged on the outlet side of the noise reduction guide channel 300, that is, the noise reduction guide channel 300 is connected between the smoke hood and the fan assembly 200, and the external oil smoke enters the range hood from the smoke hood, and then enters the fan assembly 200 along the noise reduction guide channel 300.

[0056] The inner wall of the noise reduction flow channel 300 is provided with a sound absorbing structure 400, which can reduce the noise intensity. From the inlet to the outlet of the noise reduction flow channel 300, the cross-sectional area of ​​the flow channel of the noise reduction flow channel 300 gradually decreases, thereby presenting a Venturi structure.

[0057] When the fan assembly 200 is working, the oil smoke in the smoke hood passes through the noise reduction guide channel 300. Since the cross-sectional area of ​​the flow channel of the noise reduction guide channel 300 gradually decreases, according to the principle of Venturi effect, when the oil smoke flows through the reduced flow section, the flow velocity of the oil smoke will increase, and its kinetic energy will be accelerated, which is conducive to the suction of the oil smoke and improves the oil smoke suction effect of the range hood. At the same time, since the inner wall of the noise reduction guide channel 300 is provided with a sound-absorbing structure 400, the noise value can be effectively reduced when the oil smoke passes through, thereby achieving the effect of noise reduction and silencing of the whole machine.

[0058] In one possible implementation, Figure 2 As shown, the bellows device further includes a flow guide 500 , which is disposed in the housing. There is a gap between the outer wall of the flow guide 500 and the inner wall of the housing, and the gap forms a noise reduction flow guide channel 300 .

[0059] The fan assembly 200 includes two inlets spaced apart along a first direction and facing opposite directions; the guide member 500 is located below the fan assembly 200; the guide member 500 includes a first side wall 510 and a second side wall 520 with gradually increasing spacing from top to bottom, and the first side wall 510 and the second side wall 520 are spaced apart along the first direction; the outer shell includes a first side inner wall and a second side inner wall spaced apart along the first direction, and the first side inner wall is close to the first side wall 510 and away from the second side wall 520; the second side inner wall is close to the second side wall 520 and away from the first side wall 510; the first side wall 510 is spaced apart from the first side inner wall to form a noise reduction guide channel 300; the second side wall 520 is spaced apart from the second side inner wall to form another noise reduction guide channel 300, and the two noise reduction guide channels 300 correspond to the two inlets of the fan assembly 200 respectively.

[0060] Specifically, in this embodiment, the fan assembly 200 is arranged on the left and right sides, that is, the two inlets of the fan assembly 200 are respectively facing the left and right sides. The guide member 500 is located below the fan assembly 200, and in the left and right directions, it is approximately located in the middle of the shell. The guide member 500 includes a first side wall 510 and a second side wall 520 with gradually increasing spacing from top to bottom. The first side wall 510 and the first side inner wall, that is, the left inner wall of the shell, are spaced apart, and the second side wall 520 and the first side inner wall, that is, the right inner wall of the shell, are spaced apart so that noise reduction guide channels 300 are formed on both sides of the guide member 500. The oil smoke entering from the smoke hood enters the noise reduction guide channel 300 on the left and the noise reduction guide channel 300 on the right, respectively, and then is absorbed by the inlets on the left and right sides of the fan assembly 200. The noise reduction guide channels 300 on the left and right sides are roughly symmetrically arranged, which can evenly divide the negative pressure generated by the fan assembly 200.

[0061] In other feasible solutions, the fan may also be arranged along the front-to-back direction, and correspondingly, the two noise reduction guide channels 300 are also arranged along the front-to-back intervals.

[0062] Further, such as Figure 3 As shown, the downward projection of the fan assembly 200 falls into the guide member 500, and the guide member 500 can play the role of receiving oil stains, and the oil stains dripping from the fan assembly 200 will fall on the guide plate to avoid dripping directly onto the oil net of the smoke hood.

[0063] Specifically, Figure 8 - Fig.10 As shown, the guide member 500 includes a bottom plate 530 connected between the first side wall 510 and the second side wall 520, and the oil will flow onto the bottom plate 530. From top to top, the bottom plate 530 is tilted backward, and the oil droplets generated by condensation on the inclined surface are directed to the lower part, and finally gathered at the rear of the box body and then directed to the oil cup.

[0064] In other feasible solutions, the above-mentioned Venturi structure may be formed only by changing the shape of the outer shell.

[0065] like Figure 3 As shown, the shell also includes a third side inner wall and a fourth side inner wall, and the first side inner wall, the second side inner wall, the third side inner wall and the fourth side inner wall are connected end to end in sequence; in this embodiment, the first side inner wall, the second side inner wall, the third side inner wall and the fourth side inner wall are specifically the left side inner wall, the front side inner wall, the right side inner wall and the rear side inner wall of the shell.

[0066] Specifically, at least one of the first side wall 510, the second side wall 520, the bottom plate 530, the first side inner wall, the second side inner wall, the third side inner wall and the fourth side inner wall is provided with a sound absorbing structure 400. In this embodiment, the first side wall 510, the second side wall 520, the bottom plate 530, the first side inner wall, the second side inner wall, the third side inner wall and the fourth side inner wall are all provided with a sound absorbing structure 400. Since the bottom plate 530, the first side wall 510 and the second side wall 520 of the guide member 500 are all inclined surfaces, based on the principle of the fluid Coanda effect, this design can make the oil smoke along the inclined surface better collected by the fan, and reduce the vibration noise generated by the impact of the oil smoke and the surface of the sound absorbing structure 400.

[0067] Specifically, the sound absorbing structure 400 includes a porous sound absorbing box and a sound absorbing material inside the porous sound absorbing box, wherein the porous sound absorbing box can collect noise, and the sound absorbing material inside the porous sound absorbing box can reduce air vibration.

[0068] like Figure 5 and Figure 6 As shown, the shell includes a cylinder 120, a surrounding plate 130 and a cover plate 140, and a notch 121 connected to the lower end opening of the cylinder 120 is provided on the front wall of the cylinder 120; the left side or the right side of the cylinder 120 is an opening 122; the surrounding plate 130 includes a first plate portion 131 and a second plate portion 132 connected to each other, the free end of the first plate portion 131 is connected to the side of the cylinder 120 relative to the opening 122, and the free end of the second plate portion 132 is connected to the rear side of the cylinder 120, the first plate portion 131 is used to block the notch 121, and the second plate portion 132 is used to block the lower part of the opening 122; the cover plate 140 is used to block the remaining upper part of the opening 122.

[0069] like Figure 4 - Figure 7 As shown, the cylinder 120 is a structure with three side walls in the circumferential direction. In this embodiment, the left side thereof is an opening 122. The cylinder 120 is fixed to the air outlet plate 110 by welding or riveting. The distance between the front and rear sides of the cylinder 120 is L2, and a flange is provided at the opening 122 of the cylinder 120. The length of the opening 122 in the front-to-back direction is L3, and the maximum length of the fan assembly 200 in the front-to-back direction is L1, L3<L1<L2, so the fan assembly 200 is installed upward through the bottom of the cylinder 120, and the top is fastened to the air outlet plate 110 with screws, and the front side is fastened to the cylinder 120 with screws.

[0070] like Figure 5 and Fig. 9 The maximum length of the guide member 500 in the front-to-back direction is L5, L3<L5<L2, so the guide member 500 is installed upward through the bottom of the cylinder 120, and the rear side is fastened to the cylinder 120 with screws.

[0071] Further, such as Figure 4 and Fig.10 As shown, the front end of the guide member 500 is connected to the first plate portion 131, and the rear end of the guide member 500 is connected to the rear side of the cylinder 120. The guide member 500 is of conical design. After installation, the length H2 of the guide member 500 in the left-right direction is greater than the length H1 of the fan assembly 200 in the left-right direction. The bottom plate 530 of the guide member 500 is inclined at an angle x, and x>10°. The left and right plates of the guide member 500 are designed with an inclination angle greater than x°. Based on the inertial characteristics of the flow of oil droplets, this design can guide the oil droplets generated by condensation on the inclined surface to a lower place, and finally converge to the rear of the box and then guide them into the oil cup.

[0072] The front side of the L-shaped enclosure 130 is fastened to the bottom of the cylinder 120, the left side is fastened to the bottom of the cylinder 120, and the right side is fastened to the bottom of the cylinder 120. The front side of the guide 500 is connected to the enclosure 130, and the rear side is connected to the cylinder 120. The guide 500 plays a supporting and connecting role. The fixed connection of the enclosure 130 on all sides can make its components form a more stable component body, and the bellows device can eliminate the deformation of the fan assembly 200 caused by gravity shaking during operation. As a stable component body, it can meet the subsequent installation and disassembly of the whole machine.

[0073] like Figure 6 As shown, the first plate portion 131 is inclined, and its inclination angle can be 2x°, which is designed to match the x° after the guide member 500 is installed. After the enclosure 130 is installed, the inclination height L6 = (0.4-0.6) * L4, where L4 is the front-to-back distance between the bottom edge of the first plate portion 131 and the bottom edge of the rear side of the cylinder 120. The relationship between the inclination angle and height of the first plate portion 131 and the bottom opening of the cylinder 120 and the inclination angle of the oil guide member can form a semi-wedge-shaped air intake channel. According to the principle of the Venturi effect, when the oil smoke flows through the reduced flow section, the oil smoke will increase in flow velocity and its kinetic energy will accelerate. Its flow velocity is inversely proportional to the flow section. According to Bernoulli's law, the increase in flow velocity is accompanied by a decrease in fluid pressure, that is, the common Venturi phenomenon occurs, which is conducive to the suction of oil smoke and improves the oil smoke suction effect of the range hood.

[0074] The cover plate 140 is installed on the left side of the cylinder 120, so that the shell constitutes an independent component body, so that the oil smoke can only flow into the bottom of the cylinder 120 and be discharged from the air outlet after passing through the fan assembly 200, and it is not easy to overflow through other places.

[0075] like Fig.11As shown, in another possible implementation, the structure of the shell is different. In this implementation, the shell includes a barrel 120 and a cover plate 140. The left side or right side of the barrel 120 is an opening 122. The cover plate 140 is connected to the barrel 120, for example, by screws. The cover plate 140 is used to block the opening 122. The barrel 120 and the cover plate 140 surround the upper opening and the lower opening of the shell. In other words, the barrel 120 includes three side plates, and the three side plates and the cover plate 140 form a structure that is closed all around and open at the top and bottom.

[0076] The front side of the cylinder 120 has a vertical plane located above and an inclined plane located below the vertical plane. From top to bottom, the inclined plane is inclined toward the rear side. The vertical plane and the inclined plane are integrally formed, and oil can flow out from the inner wall of the front side of the cylinder 120 from top to bottom. There is no seam between the two, so there will be no problem of oil leakage.

[0077] The range hood provided by the utility model includes the above-mentioned bellows device. Since the range hood provided by the utility model adopts the above-mentioned bellows device, the range hood provided by the utility model also has the advantages of the bellows device.

[0078] Finally, it should be noted that the above embodiments are only used to illustrate the technical solution of the utility model, rather than to limit it. Although the utility model has been described in detail with reference to the aforementioned embodiments, ordinary technicians in this field should understand that they can still modify the technical solutions recorded in the aforementioned embodiments, or replace some or all of the technical features therein with equivalents. However, these modifications or replacements do not make the essence of the corresponding technical solution deviate from the scope of the technical solution of the embodiments of the utility model.

Claims

1. A bellows device, characterized in that: include: A housing and a fan assembly (200), wherein a noise reduction guide channel (300) is arranged in the housing, and the fan assembly (200) is arranged on one side of the outlet of the noise reduction guide channel (300) so that oil smoke flows from the inlet of the noise reduction guide channel (300) to the outlet thereof; The inner wall of the noise reduction and diversion channel (300) is provided with a sound absorbing structure (400); From the inlet of the noise reduction guide channel (300) toward the outlet, the cross-sectional area of ​​the flow channel of the noise reduction guide channel (300) gradually decreases.

2. The bellows device according to claim 1, characterized in that: The bellows device further comprises a flow guide member (500), wherein the flow guide member (500) is arranged in the outer shell, and there is a gap between the outer wall of the flow guide member (500) and the inner wall of the outer shell, and the gap forms the noise reduction flow guide channel (300).

3. The bellows device according to claim 2, characterized in that: The fan assembly (200) comprises two inlets spaced apart and facing opposite directions along a first direction; The guide member (500) is located below the fan assembly (200); the guide member (500) comprises a first side wall (510) and a second side wall (520) with a gradually increasing spacing from top to bottom, and the first side wall (510) and the second side wall (520) are arranged at intervals along a first direction; The housing comprises a first side inner wall and a second side inner wall spaced apart along a first direction, wherein the first side inner wall is close to the first side wall (510) and away from the second side wall (520); the second side inner wall is close to the second side wall (520) and away from the first side wall (510); The first side wall (510) is spaced apart from the first side inner wall to form a noise reduction guide channel (300); the second side wall (520) is spaced apart from the second side inner wall to form another noise reduction guide channel (300), and the two noise reduction guide channels (300) respectively correspond to the two inlets of the fan assembly (200) in upper and lower directions.

4. The bellows device according to claim 3, characterized in that: The downward projection of the fan assembly (200) falls within the flow guide (500).

5. The bellows device according to claim 3, characterized in that: The guide member (500) comprises a bottom plate (530) connected between the first side wall (510) and the second side wall (520), and the bottom plate (530) is tilted backward from top to bottom, so as to guide the oil dirt toward the rear side of the housing.

6. The bellows device according to claim 5, characterized in that: The housing further comprises a third side inner wall and a fourth side inner wall, wherein the first side inner wall, the second side inner wall, the third side inner wall and the fourth side inner wall are connected end to end in sequence; The sound absorbing structure (400) is disposed on at least one of the first side wall (510), the second side wall (520), the bottom plate (530), the first side inner wall, the second side inner wall, the third side inner wall and the fourth side inner wall.

7. The bellows device according to claim 6, characterized in that: The sound absorbing structure (400) comprises a porous sound absorbing box and a sound absorbing material located in the porous sound absorbing box.

8. The bellows device according to any one of claims 2 to 7, characterized in that: The shell comprises a cylinder (120), a surrounding plate (130) and a cover plate (140); a notch (121) communicating with the lower end opening of the cylinder (120) is provided on the front wall of the cylinder (120); The left side or right side of the cylinder (120) is open (122); The enclosure (130) includes a first plate portion (131) and a second plate portion (132) connected to each other, wherein the free end of the first plate portion (131) is connected to the side of the cylinder (120) relative to the opening (122), and the free end of the second plate portion (132) is connected to the rear side of the cylinder (120), the first plate portion (131) is used to block the notch (121), and the second plate portion (132) is used to block the lower portion of the opening (122); the cover plate (140) is used to block the remaining upper portion of the opening (122).

9. The bellows device according to claim 8, characterized in that: The front end of the flow guide (500) is connected to the first plate portion (131), and the rear end of the flow guide (500) is connected to the rear side surface of the cylinder (120).

10. The bellows device according to claim 8, characterized in that: The shell comprises a cylinder (120) and a cover plate (140), and the left side or the right side of the cylinder (120) is open (122); The cover plate (140) is connected to the cylinder (120), and the cover plate (140) is used to block the opening (122). The cylinder (120) and the cover plate (140) enclose an upper opening and a lower opening of the shell; The front side surface of the cylinder (120) comprises a vertical plane located above and an inclined surface located below the vertical plane, and from top to bottom, the inclined surface is inclined toward the rear side, and the vertical plane and the inclined surface are integrally formed.

11. A range hood, characterized in that: It comprises the bellows device as claimed in any one of claims 1 to 10.

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