CN210127951U

CN210127951U - Fan and range hood

Info

Publication number: CN210127951U
Application number: CN201920990646.7U
Authority: CN
Inventors: 任富佳; 唐人; 郑桐福; 孟君; 罗贤才; 班永; 余国成; 周海昕
Original assignee: Hangzhou Robam Appliances Co Ltd
Current assignee: Hangzhou Robam Appliances Co Ltd
Priority date: 2019-06-27
Filing date: 2019-06-27
Publication date: 2020-03-06
Anticipated expiration: 2029-06-27

Abstract

The utility model provides a fan and lampblack absorber relates to kitchen appliance technical field. The fan comprises a volute, an impeller and a driving device, wherein the volute comprises a surrounding plate and two side plates arranged at intervals, the surrounding plate is connected between the two side plates and forms an air channel together with the two side plates, and the side plates are provided with air inlets; the impeller is arranged in the volute and is connected with the driving shaft, the driving device comprises a driving part and a transmission part, the driving part is arranged on the outer wall of the enclosing plate, and the transmission part is connected between the driving end of the driving part and the driving shaft. This lampblack absorber includes box and above-mentioned fan, and the fan is installed in the box. The driving part in the fan is less polluted by oil stains and has longer service life.

Description

Fan and range hood

Technical Field

The utility model relates to a kitchen appliance technical field especially relates to a fan and lampblack absorber.

Background

The range hood is a purification device widely applied to a kitchen, a fan in the range hood operates to generate negative pressure, oil smoke on the kitchen side is sucked into the fan, and the oil smoke is conveyed into a public flue through an exhaust pipe, so that the fan is a core part of the range hood, and the quality of the effect directly determines the purification effect of the range hood on the oil smoke.

In the operation process of the existing range hood, oil stain pollution caused by oil smoke gas flow to a motor of a fan is serious, so that the operation efficiency of the motor is reduced, and the service life of the motor is shortened.

SUMMERY OF THE UTILITY MODEL

An object of the utility model is to provide a fan and lampblack absorber to solve the fan operation in-process of the lampblack absorber that exists among the prior art, the motor receives the greasy dirt to pollute comparatively seriously, leads to the technical problem that motor operating efficiency reduces and life shortens.

The utility model provides a fan, which comprises a volute, an impeller and a driving device, wherein the volute comprises a coaming and two side plates which are arranged at intervals, the coaming is connected between the two side plates and the three side plates jointly form an air duct, and the side plates are provided with air inlets;

the impeller is arranged in the volute and is connected with a driving shaft, the driving device comprises a driving part and a transmission part, the driving part is arranged on the outer wall of the enclosing plate, and the transmission part is connected between the driving end of the driving part and the driving shaft.

Furthermore, an accommodating space is formed between the air outlet pipe of the volute and the enclosing plate, and the driving part is accommodated in the accommodating space.

Further, the volute is provided with a support member, and the driving shaft penetrates through the support member and is pivoted to the support member.

Further, a central disc is fixedly connected in the impeller, and the impeller is connected with the driving shaft through the central disc; the support component comprises a first support frame, and the first support frame is located between the central disc and the transmission component.

Furthermore, the first support frame comprises a connecting ring, a support table and at least two support arms, the support arms are connected between the support table and the connecting ring and are radially arranged around the circumferential direction of the support table, and the connecting ring is connected with the volute and surrounds the edge of the air inlet; the driving shaft penetrates through the supporting platform and is pivoted to the supporting platform.

Further, a vibration damping part is arranged between the first support frame and the volute.

Further, the fan still includes the connecting piece, the damping piece includes damping portion, connecting portion and compresses tightly the portion, connecting portion connect in damping portion with compress tightly between the portion, the link clamp of first support frame is located damping portion with compress tightly between the portion, the connecting piece passes compress tightly the portion connecting portion with damping portion with the spiral case is connected.

Furthermore, the support component also comprises a second support frame, and the second support frame and the first support frame are distributed on two sides of the central disc.

Furthermore, the transmission part comprises a driving wheel, a conveying belt and a driven wheel, the driving wheel is connected with the driving end of the driving part, the driven wheel is connected with the driving shaft, and the conveying belt is sleeved on the driving wheel and the driven wheel.

Another object of the utility model is to provide a range hood, including box and above-mentioned fan, the fan install in the box.

The utility model discloses fan and lampblack absorber's beneficial effect does:

the utility model provides a fan and lampblack absorber, wherein, the fan includes can form the wind channel and be used for the spiral case of installation component, the impeller that is used for driving the gas flow and the drive arrangement that is used for driving the impeller rotation, drive arrangement includes the drive component who is the power supply and is used for transmitting power to the transmission component of impeller through the drive shaft, wherein the driving component is installed at the bounding wall of spiral case; wherein, the lampblack absorber is used for holding the oil smoke and is used for the box of installing component and the above-mentioned fan that is used for driving outside oil smoke to flow through the box and discharge including being used for.

When the range hood needs to be used, the driving part is opened, the driving part drives the driving shaft to rotate through the transmission part, the driving shaft further drives the impeller to rotate, the box body is in a negative pressure state, external oil smoke enters the box body under the action of internal and external pressure difference, then enters the volute through the air inlet under the suction action of the volute air inlet, and is discharged through the air outlet, so that the range hood can purify the oil smoke in a kitchen. The oil smoke entering the box body flows to the air inlets under the suction action of the air inlets on the two sides of the volute, so that the oil smoke concentration of the areas of the air inlets on the two sides of the volute is higher, and the oil smoke concentration of other areas in the box body is correspondingly lower; then the oil smoke enters the volute and is discharged, the oil smoke concentration in the volute is also higher, and the oil smoke concentration is higher than that of the area of the air inlet in the box body. Compare the driver part and install inside the spiral case, the driver part of this application is installed on the bounding wall of spiral case, is located the less region of box oil smoke concentration, and the oil smoke that receives pollutes greatly reduced to ensure driver part's normal operating, and extension driver part's life.

Drawings

In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the technical solutions in the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without creative efforts.

Fig. 1 is a schematic view of an internal structure of a range hood provided by the embodiment of the present invention, in which a fan is installed in a box body;

fig. 2 is a schematic structural diagram of a fan provided in an embodiment of the present invention;

fig. 3 is a schematic cross-sectional structural view of a blower provided in an embodiment of the present invention;

FIG. 4 is an enlarged view of part A of FIG. 3;

fig. 5 is an explosion structure diagram of the blower provided by the embodiment of the present invention.

Icon: 1-a volute; 11-enclosing plates; 12-side plates; 13-air inlet; 14-air outlet pipe; 15-a containment space; 16-a connecting seat; 17-mounting a support; 18-a wind-guiding ring; 19-a bearing; 2-an impeller; 21-a middle disc; 3-a drive shaft; 4-a drive member; 5-a transmission component; 51-a driving wheel; 52-a conveyor belt; 53-driven wheel; 6-a first support frame; 61-a connecting ring; 62-a support arm; 63-a support table; 64-a limit groove; 65-card slot; 7-a damping member; 71-a vibration damping portion; 72-a connecting part; 73-a compression part; 74-a connector; 75-a limit boss; 8-a second support; 9-a box body; 91-check valve.

Detailed Description

The technical solution of the present invention will be described clearly and completely with reference to the accompanying drawings, and obviously, the described embodiments are some, but not all embodiments of the present invention. Based on the embodiments in the present invention, all other embodiments obtained by a person skilled in the art without creative work belong to the protection scope of the present invention.

In the description of the present invention, it should be noted that the terms "upper", "inner", "outer", and the like indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, which are only for convenience of description and simplification of description, but do not indicate or imply that the device or element referred to must have a specific orientation, be constructed in a specific orientation, and be operated, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.

In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the terms "mounted" and "connected" are to be interpreted broadly, and may be, for example, fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meaning of the above terms in the present invention can be understood in specific cases to those skilled in the art.

The embodiment provides a fan, as shown in fig. 1-3, including a volute 1, an impeller 2 and a driving device, where the volute 1 includes a shroud plate 11 and two side plates 12 arranged at intervals, the shroud plate 11 is connected between the two side plates 12, and the three together define an air duct, and the side plates 12 are provided with an air inlet 13; the impeller 2 is arranged in the volute 1, the impeller 2 is connected with the driving shaft 3, the driving device comprises a driving part 4 and a transmission part 5, the driving part 4 is arranged on the outer wall of the enclosing plate 11, and the transmission part 5 is connected between the driving end of the driving part 4 and the driving shaft 3.

This embodiment still provides a lampblack absorber, as shown in fig. 1, including box 9 and above-mentioned fan, the fan is installed in box 9.

The fan and the range hood provided by the embodiment are characterized in that the fan comprises a volute 1 which can form an air channel and is used for installing components, an impeller 2 used for driving air to flow and a driving device used for driving the impeller 2 to rotate, the driving device comprises a driving component 4 serving as a power source and a transmission component 5 used for transmitting power to the impeller 2 through a driving shaft 3, wherein the driving component 4 is installed on a coaming 11 of the volute 1; wherein, the lampblack absorber is including being used for holding the oil smoke and being used for box 9 of installation component and the above-mentioned fan that is used for driving outside oil smoke to flow through box 9 and discharge.

When the range hood needs to be used, the driving part 4 is opened, the driving part 4 drives the driving shaft 3 to rotate through the transmission part 5, the driving shaft 3 further drives the impeller 2 to rotate, a negative pressure state is formed in the box body 9, external oil smoke enters the box body 9 under the action of internal and external pressure difference, and then enters the volute 1 through the air inlet 13 under the suction action of the air inlet 13 of the volute 1, and the oil smoke is discharged through the air outlet, so that the purification treatment of the range hood on the oil smoke in a kitchen is realized. Wherein, the oil smoke entering the box 9 flows to the air inlet 13 under the suction action of the air inlets 13 at the two sides of the volute 1, so that the oil smoke concentration of the areas of the air inlets 13 at the two sides of the volute 1 is higher, and the oil smoke concentration of other areas in the box 9 is correspondingly lower; then the oil smoke enters the volute 1 and is discharged, the oil smoke concentration in the volute 1 is also larger, and the oil smoke concentration is larger than that in the area of the air inlet 13 in the box body 9. Compare drive component 4 and install inside volute 1, the drive component 4 of this application is installed on volute 1's bounding wall 11, is located the less region of box 9 interior oil smoke concentration, and the oil smoke that receives pollutes greatly reduced to ensure drive component 4's normal operating, and prolong drive component 4's life.

In addition, the driving part 4 and the transmission part 5 of the driving device are both located outside the volute 1, and the driving part 4 is located on the enclosing plate 11 of the volute 1, so that the air inlet 13 cannot be blocked, only the transmission part 5 can partially block the air inlet 13, and the driving device is installed inside the volute 1 compared with the driving part 4.

Specifically, in this embodiment, as shown in fig. 3, one end of the driving shaft 3 is connected to the impeller 2, the other end of the driving shaft extends out of the air inlet 13, the transmission member 5 is connected to the shaft body of the driving shaft 3 extending out of the air inlet 13, and a gap exists between the transmission member 5 and the air inlet 13. When the fan runs, oil smoke can enter the air inlet 13 through a gap between the transmission part 5 and the air inlet 13, so that the blockage of the transmission part 5 on the air inlet 13 is further reduced, the air performance of the fan is correspondingly improved, and the smoke purification effect of the range hood is improved.

In this embodiment, as shown in fig. 1, an accommodating space 15 is formed between the air outlet pipe 14 of the scroll casing 1 and the shroud 11, and the driving component 4 is accommodated in the accommodating space 15. The shape of the volute 1 is similar to a spiral shape, the air outlet pipe 14 extends outwards, an accommodating space 15 is formed between the inner side wall of the air outlet pipe 14 and the enclosing plate 11, and the driving component 4 is installed at the enclosing plate 11 of the accommodating space 15 and has small influence on the whole volume of the volute 1; box 9 of lampblack absorber is regular shape generally, box 9 inner space is greater than the whole overall dimension of spiral case 1, then spiral case 1 installs when box 9, this accommodation space 15 is regional to be in the vacant state, install drive component 4 in accommodation space 15's bounding wall 11 department, realize to impeller 2's drive and receive the greasy dirt and pollute less basis on, can also be to the space make full use of in the box 9, reduce and avoid drive component 4 to install at 11 other positions on the bounding wall and lead to the whole overall dimension increase of fan even, the corresponding emergence that needs the increase condition of box 9.

In this embodiment, as shown in fig. 2 and 5, a connecting seat 16 may be provided on the volute casing 1. The shape of connecting seat 16 is corresponding with the shape of lampblack absorber box 9, and spiral case 1 is connected with box 9 through connecting seat 16, and connection stability is higher. Specifically, connecting seat 16 and box 9 may be connected by bolts or screws.

In this embodiment, as shown in fig. 2, a mounting seat 17 may be provided on the enclosure 11, and the driving member 4 may be detachably and fixedly mounted on the mounting seat 17. Installing support 17 sets up according to drive component 4's shape and size, and drive component 4 is higher with installing support 17's matching degree, and drive component 4 can improve greatly with installing support 17's firm in connection degree and stability, and is corresponding, and the vibration and the noise pollution that produce are less when drive component 4 moves.

In this embodiment, as shown in fig. 3, an air guiding ring 18 may be disposed at the air inlet 13 of the volute 1, when oil smoke enters the air inlet 13, the direction of the oil smoke changes, and the air guiding ring 18 guides the oil smoke flow, so as to reduce turbulent flow caused by rapid change of the oil smoke direction, and correspondingly reduce noise pollution caused by the oil smoke flow.

In this embodiment, a support member may be provided at the scroll casing 1, and the driving shaft 3 passes through the support member and is pivoted to the support member. The supporting component can support and limit the driving shaft 3 and the pivot joint of the driving shaft, and limits the position of the axis of the driving shaft 3 in the rotation process, so that the concentricity of the driving shaft 3 and the impeller 2 is improved, and the normal operation of the fan is ensured.

Specifically, in the present embodiment, as shown in fig. 3, a central disc 21 may be fixedly connected to the impeller 2, and the impeller 2 is connected to the driving shaft 3 through the central disc 21; the supporting component comprises a first supporting frame 6, and the first supporting frame 6 is positioned between the central disc 21 and the transmission component 5; the drive shaft 3 passes through the first support frame 6 and is pivoted to the first support frame 6. The first support frame 6 plays a role in supporting and limiting the driving shaft 3 through the driving shaft 3 and the pivot joint of the driving shaft 3, and on one hand, can support the driving shaft 3 and the transmission part 5 connected with the driving shaft 3; on the other hand, the position at which the drive shaft 3 rotates can be limited to reduce the occurrence of the displacement of the impeller 2 due to the swing in the rotation of the drive shaft 3, thereby ensuring the coaxial driving of the drive shaft 3 and the impeller 2.

Specifically, in this embodiment, as shown in fig. 5, the first support frame 6 may include a connection ring 61, a support table 63, and at least two support arms 62, where the support arms 62 are connected between the support table 63 and the connection ring 61, and are radially arranged around the circumference of the support table 63, and the connection ring 61 is connected to the volute 1 and surrounds the edge of the air inlet 13; the driving shaft 3 passes through the supporting base 63 and is pivoted to the supporting base 63. Here, it is a specific form of the first support frame 6, wherein the connecting ring 61 is used for connecting with the volute 1, the support platform 63 is used for pivotally connecting with the drive shaft 3, and the support arm 62 is used for connecting and supporting the support platform 63. Specifically, the support arms 62 may be plural, and the plural support arms 62 are uniformly arranged around the circumference of the support table 63 to support different positions of the support table 63. Specifically, the first support frame 6 and the drive shaft 3 may be pivotally connected by the bearing 19, so as to reduce frictional resistance between the first support frame 6 and the drive shaft 3 under the effect of ensuring the supporting and limiting of the drive shaft 3 by the first support frame 6, and accordingly ensure the driving efficiency of the driving device for the drive shaft 3 and the impeller 2.

In the present embodiment, as shown in fig. 2 to 5, a vibration damping member 7 may be further provided between the first support frame 6 and the scroll casing 1. The vibration force generated by the operation of the driving device is transmitted to the driving shaft 3 and the first support frame 6, and the vibration damping part 7 is used for damping the vibration force transmitted from the first support frame 6 to the volute 1, so that the vibration force transmitted from the first support frame 6 to the volute 1 is weakened, and the noise pollution generated by the operation of the fan is correspondingly reduced.

Specifically, in this embodiment, as shown in fig. 4, the blower may further include a connecting member 74, the vibration damping member 7 includes a vibration damping portion 71, a connecting portion 72 and a pressing portion 73, the connecting portion 72 is connected between the vibration damping portion 71 and the pressing portion 73, the connecting end of the first support frame 6 is clamped between the vibration damping portion 71 and the pressing portion 73, and the connecting member 74 passes through the pressing portion 73, the connecting portion 72 and the vibration damping portion 71 and is connected to the scroll casing 1. Here is a specific form of the vibration damping member 7, specifically, a through hole may be provided on the vibration damping member 7, the through hole penetrates through the vibration damping portion 71, the connecting portion 72 and the pressing portion 73, the connecting member 74 penetrates through the through hole to be connected with the scroll casing 1, the pressing portion 73 presses the connecting end of the first support frame 6 between the pressing portion 73 and the vibration damping portion 71 under the action of the connecting member 74, the first support frame 6 does not directly contact with the scroll casing 1, and when the vibration force generated by the operation of the driving device is transmitted to the vibration damping portion 71, the vibration force is transmitted to the scroll casing 1 through the vibration damping processing of the vibration damping portion 71, so that the vibration force transmitted from the driving device to the scroll casing 1 is reduced, and accordingly, noise pollution generated. Specifically, the connecting member 74 may be a bolt, a thread section of the bolt penetrates through the vibration damping member 7 and the scroll casing 1, and then is connected and screwed with a nut, a nut of the bolt is clamped on one side of the pressing portion 73, and presses the pressing portion 73, so that the connecting end of the first support frame 6 is correspondingly pressed between the pressing portion 73 and the vibration damping portion 71.

In this embodiment, as shown in fig. 5, a clamping groove 65 may be provided on the connecting ring 61, and the clamping groove 65 is in clamping fit with the connecting portion 72 of the damping member 7. When the connecting ring 61 is connected with the vibration damping piece 7, the connecting part 72 of the vibration damping piece 7 is clamped into the clamping groove 65 of the connecting ring 61, the position of the connecting ring 61 relative to the vibration damping piece 7 is limited, and the connecting position accuracy of the connecting ring 61 and the vibration damping piece 7 is improved; in addition, the firmness of the connection between the two can be improved.

Specifically, as shown in fig. 5, the vibration damping portion 71 may be an annular vibration damping ring, the vibration damping ring is disposed around the edge of the air inlet 13, the plurality of pressing portions 73 are disposed on the vibration damping ring along the circumferential direction, and the connecting portions 72 are disposed in one-to-one correspondence with the pressing portions 73. The connecting ring 61 of the first support frame 6 corresponds to the vibration damping ring, the connecting ring 61 is inserted between the pressing portions 73 and the vibration damping ring, the pressing portions 73 press different positions of the connecting ring 61, and the firmness of connection between the first support frame 6 and the volute 1 is further improved.

In this embodiment, as shown in fig. 5, a limiting boss 75 may be disposed on the damping ring, the connecting ring 61 is disposed with a limiting groove 64, and the limiting boss 75 is matched with the limiting groove 64. When the connecting ring 61 is connected with the vibration damping ring, the limiting boss 75 is inserted into the limiting groove 64 to limit the connecting position of the connecting ring 61 and the vibration damping ring, so that the connecting position accuracy of the first support frame 6 and the vibration damping part 7 is improved.

In this embodiment, as shown in fig. 3, the supporting component may further include a second supporting frame 8, and the second supporting frame 8 and the first supporting frame 6 are distributed on two sides of the central disc 21; the driving shaft 3 passes through the second supporting frame 8 and is pivoted to the second supporting frame 8. The second support frame 8 supports the free end of the driving shaft 3 for limitation, namely the first support frame 6 and the second support frame 8 support and limit the two sides of the driving shaft 3 respectively, so that the rotating position precision of the driving shaft 3 is further improved, and the free end of the driving shaft 3 is reduced to generate the swing condition.

Specifically, as shown in fig. 2, fig. 3 and fig. 5, in the present embodiment, the transmission part 5 may include a driving wheel 51, a transmission belt 52 and a driven wheel 53, the driving wheel 51 is connected to the driving end of the driving part 4, the driven wheel 53 is connected to the driving shaft 3, and the transmission belt 52 is sleeved on the driving wheel 51 and the driven wheel 53. Here is a specific form when transmission part 5 adopts a belt transmission part, the drive end of drive part 4 is connected with driving wheel 51, drive driving wheel 51 rotates, driving wheel 51 drives driven wheel 53 through conveyer belt 52 and rotates, driven wheel 53 drives drive shaft 3 and then drives impeller 2 and its synchronous rotation, realizes drive part 4 to impeller 2's drive.

Besides the above forms, the transmission part 5 may adopt a chain transmission, a gear transmission, or the like, which can transmit the motion of the driving part 4 to the driving shaft 3. In particular, the drive member 4 may be a motor.

In this embodiment, as shown in fig. 1, a check valve 91 may be communicated with the air outlet of the blower. When the range hood is in an operating state, the interior of the check valve 91 is controlled to be in a communicating state, and oil smoke flowing through the fan is discharged through the air outlet and the check valve 91; when the range hood is in a standby state, the interior of the check valve 91 is controlled to be in a blocking state, and the valve core of the check valve 91 isolates the interior of the range hood from a public flue into two independent spaces so as to reduce the pollution to a kitchen caused by the backflow of oil smoke in the public flue to the kitchen through the box body 9.

Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, it should be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; such modifications and substitutions do not depart from the spirit and scope of the embodiments of the present invention.

Claims

1. A fan is characterized by comprising a volute (1), an impeller (2) and a driving device, wherein the volute (1) comprises a coaming (11) and two side plates (12) arranged at intervals, the coaming (11) is connected between the two side plates (12) and jointly forms an air duct in a surrounding manner, and the side plates (12) are provided with air inlets (13);

impeller (2) are located in spiral case (1), impeller (2) are connected with drive shaft (3), drive arrangement includes drive component (4) and transmission part (5), drive component (4) install in bounding wall (11) outer wall, transmission part (5) connect in the drive end of drive component (4) with between drive shaft (3).

2. The fan according to claim 1, characterized in that an accommodating space (15) is formed between the air outlet pipe (14) of the volute (1) and the shroud plate (11), and the driving component (4) is accommodated in the accommodating space (15).

3. The fan according to claim 1 or 2, characterized in that the volute (1) is provided with a support member through which the drive shaft (3) passes and is pivoted to.

4. The fan according to claim 3, characterized in that a central disc (21) is fixed in the impeller (2), and the impeller (2) is connected with the driving shaft (3) through the central disc (21); the support component comprises a first support frame (6), and the first support frame (6) is located between the central disc (21) and the transmission component (5).

5. The fan according to claim 4, wherein the first support frame (6) comprises a connecting ring (61), a support table (63) and at least two support arms (62), the support arms (62) are connected between the support table (63) and the connecting ring (61) and are radially arranged around the circumference of the support table (63), and the connecting ring (61) is connected with the volute (1) and surrounds the edge of the air inlet (13); the drive shaft (3) passes through the support table (63) and is pivoted to the support table (63).

6. The fan according to claim 4, characterized in that a vibration damper (7) is provided between the first support frame (6) and the volute (1).

7. The fan according to claim 6, further comprising a connecting member (74), wherein the damping member (7) comprises a damping portion (71), a connecting portion (72) and a pressing portion (73), the connecting portion (72) is connected between the damping portion (71) and the pressing portion (73), the connecting end of the first support frame (6) is clamped between the damping portion (71) and the pressing portion (73), and the connecting member (74) passes through the pressing portion (73), the connecting portion (72) and the damping portion (71) and is connected with the volute (1).

8. The fan according to claim 4, characterized in that the support members further comprise a second support frame (8), the second support frame (8) and the first support frame (6) being distributed on both sides of the central disc (21).

9. The fan according to claim 1 or 2, wherein the transmission part (5) comprises a driving wheel (51), a transmission belt (52) and a driven wheel (53), the driving wheel (51) is connected with the driving end of the driving part (4), the driven wheel (53) is connected with the driving shaft (3), and the transmission belt (52) is sleeved on the driving wheel (51) and the driven wheel (53).

10. A range hood, characterized in that it comprises a box (9) and a fan according to any one of claims 1 to 9, said fan being mounted in said box (9).