Volute, fan and range hood

Abstract

The utility model discloses a volute which comprises a volute body provided with an air cavity, the side wall of the volute body is provided with a noise reduction area, and the noise reduction area is provided with a plurality of first noise reduction holes arranged at intervals; the sound absorption part is attached to the outer side wall of the volute body and covers the noise reduction area; the fixed plate is fixedly mounted on the volute body, and a plurality of second noise reduction holes which are formed at intervals are formed in the fixed plate; wherein the sound absorption piece is clamped between the side wall of the volute body and the fixing plate. Therefore, the sound absorption piece can absorb noise from the interior of the air cavity and the exterior of the volute. In addition, the part, not provided with the second noise reduction hole, of the fixing plate can block airflow penetrating through the sound absorption part, so that the air volume leaked to the outside of the volute from the sound absorption part can be reduced, the air pressure of the fan is improved, and the smoke exhaust effect of the range hood can be improved. In addition, the utility model further discloses a fan with the volute and a range hood with the fan.

Description

Technical Field

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

[0002] A range hood is a kitchen appliance used to purify the kitchen environment. It can quickly extract the fumes generated during cooking and discharge them outdoors. The fan is the core component of the range hood, which includes a volute, a motor and an impeller. The motor is installed in the volute, and the impeller is located in the volute and is connected to the motor. When the fan is working, the motor drives the impeller to rotate in the volute to form a negative pressure, thereby pushing the gas at the volute inlet to flow along the inner wall of the volute and be discharged from the volute outlet.

[0003] During the operation of the fan, the high-speed rotation of the impeller and the vibration of the motor are likely to generate noise, and the vibration of the motor is also likely to cause the casing of the range hood to vibrate and generate noise. If the user cooks in a high-noise environment for a long time, it is easy to affect the user's cooking experience, and may also cause the user to feel irritable, headache and other discomforts, which will affect the user's health. For this reason, the prior art usually opens a plurality of noise reduction holes on the volute, and covers the outer wall of the volute with a layer of sound-absorbing cotton, thereby absorbing the noise inside and outside the volute. However, since the sound-absorbing cotton is a breathable material, when the fan is working, the high-speed and high-pressure airflow inside the volute will pass through the noise reduction holes and leak out from the breathable sound-absorbing cotton during the flow process, thereby reducing the wind pressure of the fan, resulting in poor smoke exhaust effect of the range hood. In addition, since the sound-absorbing cotton is directly exposed to the outer wall of the volute, it is also easy to affect the overall aesthetics of the volute. Utility Model Content

[0004] The utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the utility model provides a volute, which can reduce the noise generated when the fan is running and improve the smoke exhaust effect of the range hood.

[0005] The utility model also provides a fan with the volute.

[0006] The utility model also provides a range hood equipped with the above-mentioned fan.

[0007] According to the volute of the embodiment of the utility model, it includes: a volute body, which has a wind cavity, the side wall of the volute body is provided with an air inlet and an air outlet connected to the wind cavity, the side wall of the volute body has a noise reduction area, and the noise reduction area is provided with a plurality of first noise reduction holes arranged at intervals; a sound absorbing member, which is attached to the outer wall of the volute body and covers the noise reduction area; a fixing plate, which is fixedly installed on the volute body, and the fixing plate is provided with a plurality of second noise reduction holes arranged at intervals; wherein the sound absorbing member is clamped between the side wall of the volute body and the fixing plate.

[0008] The volute according to the embodiment of the utility model has at least the following beneficial effects:

[0009] By adopting the volute of the embodiment of the utility model, the sound absorbing member is clamped between the side wall of the volute and the fixed plate, so that the sound absorbing member can be well fixed. When in use, since the side wall of the volute is provided with a first noise reduction hole and the fixed plate is provided with a second noise reduction hole, the sound absorbing member can absorb the noise from the inside of the wind cavity and the outside of the volute. In addition, when the high-speed and high-pressure airflow in the wind cavity passes through the first noise reduction hole and the sound absorbing member, the part of the fixed plate without the second noise reduction hole can also block the airflow passing through the sound absorbing member, thereby reducing the amount of air leaking from the sound absorbing member to the outside of the volute, increasing the wind pressure of the fan, and further improving the smoke exhaust effect of the range hood.

[0010] According to some embodiments of the utility model, one side of the fixing plate has a receiving groove, the second noise reduction hole is opened on the bottom wall of the receiving groove, the sound absorbing component is embedded in the receiving groove, and the periphery of the receiving groove abuts against the volute body.

[0011] According to some embodiments of the present invention, the periphery of the accommodating groove has a connecting portion extending outward, and the connecting portion is fixedly connected to the outer side wall of the volute body by a fastener.

[0012] According to some embodiments of the present utility model, the number of the noise reduction zones is at least two, and each of the noise reduction zones is provided with the sound absorbing member and the fixing plate.

[0013] According to some embodiments of the utility model, the volute body has a first side panel, a second side panel and a third side panel, the first side panel and the second side panel are arranged opposite to each other, the third side panel is clamped between the first side panel and the second side panel, and the wind cavity is formed by the first side panel, the second side panel and the third side panel; wherein, at least one of the noise reduction areas is located on the third side panel.

[0014] According to some embodiments of the present invention, the diameter of the first noise reduction hole is 4 mm-8 mm, and the center distance between two adjacent first noise reduction holes is 8 mm-16 mm.

[0015] A fan according to an embodiment of the utility model comprises a motor, an impeller and a volute as described in any of the above embodiments; the motor is mounted on the volute, and the impeller is located in the wind cavity and is transmission-connected to the motor.

[0016] The fan according to the embodiment of the utility model has at least the following beneficial effects:

[0017] By adopting the volute of any of the above-mentioned embodiments, the fixing plate can fix and limit the sound absorbing member, and the sound absorbing member can absorb the noise from the inside of the wind cavity and the outside of the volute. In addition, the fixing plate can also block the airflow passing through the sound absorbing member, reducing the amount of air leaking from the sound absorbing member to the outside of the volute, thereby increasing the wind pressure of the fan, making the fan have a higher exhaust efficiency, and being able to better extract the oil smoke and discharge the oil smoke from the air outlet.

[0018] According to some embodiments of the utility model, the air inlet is located on the upper side wall of the volute, and the periphery of the air inlet is provided with an air inlet ring extending toward the wind cavity, and the horizontal height of the inner end of the air inlet ring is flush with the horizontal height of one end of the impeller close to the air inlet.

[0019] According to some embodiments of the utility model, the impeller includes a plurality of blades arranged at intervals along the circumference of the wind cavity, and in the vertical direction, all of the blades are arranged around the outer circumference of the air inlet, and each of the blades is provided with an air guide bevel at one end close to the air inlet, and the air guide bevel is located on the inner side of the blade and is arranged to be inclined downward from the outside to the inside; the air inlet ring has an arc surface with an opening facing the inside of the wind cavity; wherein, the line connecting the two ends of the arc surface opening at the relative position of the air inlet ring and the blade is a first straight line, the extension line of the air guide bevel is a second straight line, and the angle a between the first straight line and the corresponding second straight line is 35°-45°.

[0020] According to the range hood of the embodiment of the utility model, a fan according to any one of the above embodiments is provided.

[0021] The range hood according to the embodiment of the utility model has at least the following beneficial effects:

[0022] By adopting the fan of any of the above embodiments, the fan has a good noise reduction effect, thereby being able to reduce the noise generated when the range hood is working, optimize the cooking environment, reduce the adverse effects of noise on users, and enhance the user experience.

[0023] Additional aspects and advantages of the present invention will be given in part in the following description, and in part will become apparent from the following description, or will be learned through the practice of the present invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The above and / or additional aspects and advantages of the present invention will become apparent and easily understood from the description of the embodiments in conjunction with the following drawings, in which:

[0025] Figure 1 A schematic diagram of a volute of an embodiment of the utility model;

[0026] Figure 2Another schematic diagram of the volute of an embodiment of the utility model;

[0027] Figure 3 This is an exploded schematic diagram of a volute of an embodiment of the utility model;

[0028] Figure 4 A schematic diagram of a fixing plate according to an embodiment of the present utility model;

[0029] Figure 5 A schematic diagram of a fan according to an embodiment of the utility model;

[0030] Figure 6 A cross-sectional schematic diagram of a fan according to an embodiment of the utility model;

[0031] Figure 7 for Figure 6 Front view of the blower;

[0032] Figure 8 for Figure 7 A local enlarged schematic diagram of point A in the middle.

[0033] Reference numerals:

[0034] The volute body 100, the first side plate 101, the second side plate 102, the third side plate 103, the air cavity 110, the air inlet 111, the air outlet 112, the noise reduction area 120, the first noise reduction hole 121, the sound absorbing member 130, the fixing plate 140, the second noise reduction hole 141, the accommodating groove 142, the connecting portion 143, the air inlet ring 150, and the arc surface 151;

[0035] Motor 200;

[0036] Impeller 300 , blades 310 , and wind guiding bevel 311 . DETAILED DESCRIPTION

[0037] The embodiments of the present invention are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present invention, and cannot be understood as limiting the present invention.

[0038] In the description of the present invention, it should be understood that descriptions involving orientation, such as up, down, front, back, left, right, etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do 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 invention.

[0039] In the description of the present utility model, "several" means one or more, "more" means more than two, "greater than", "less than", "exceed" etc. are understood to exclude the number itself, and "above", "below", "within" etc. are understood to include the number itself. If there is a description of "first" or "second", it is only used for the purpose of distinguishing the technical features, and cannot be understood as indicating or implying the relative importance or implicitly indicating the number of the indicated technical features or implicitly indicating the order of the indicated technical features.

[0040] In the description of the present invention, unless otherwise clearly defined, terms such as setting, installing, connecting, etc. should be understood in a broad sense, and technicians in the relevant technical field can reasonably determine the specific meanings of the above terms in the present invention based on the specific content of the technical solution.

[0041] Reference Figures 1 to 4 One embodiment of the utility model provides a volute, including a volute body 100, a sound absorbing member 130 and a fixing plate 140. The volute body 100 has a wind cavity 110, and the side wall of the volute body 100 is provided with an air inlet 111 and an air outlet 112 connected to the wind cavity 110, and the side wall of the volute body 100 has a noise reduction area 120, and the noise reduction area 120 is provided with a plurality of first noise reduction holes 121 arranged at intervals. The sound absorbing member 130 is attached to the outer wall of the volute body 100 and covers the noise reduction area 120. The fixing plate 140 is fixedly installed on the volute body 100, and the fixing plate 140 is provided with a plurality of second noise reduction holes 141 arranged at intervals. Among them, the sound absorbing member 130 is sandwiched between the side wall of the volute body 100 and the fixing plate 140.

[0042] By adopting the volute of the embodiment of the utility model, the sound absorbing member 130 is sandwiched between the side wall of the volute and the fixing plate 140, so that the sound absorbing member 130 can be well fixed. When in use, since the side wall of the volute is provided with a first noise reduction hole 121, the sound absorbing member 130 can absorb the noise from the inside of the air cavity 110, such as the noise generated by the rotation of the impeller 300 and the vibration of the motor 200; since the fixing plate 140 is provided with a second noise reduction hole 141, the sound absorbing member 130 can absorb the noise from the outside of the volute, such as the noise generated by the vibration of the range hood casing. In addition, when the high-speed and high-pressure airflow in the air cavity 110 passes through the first noise reduction hole 121 and the sound absorbing member 130, the part of the fixing plate 140 without the second noise reduction hole 141 can also block the airflow passing through the sound absorbing member 130, thereby reducing the amount of air leaking from the sound absorbing member 130 to the outside of the volute, increasing the wind pressure of the fan, and further improving the smoke exhaust effect of the range hood.

[0043] It is understandable that in the prior art, when the high-speed and high-pressure airflow in the wind cavity 110 passes through the first noise reduction hole 121 on the side wall of the volute body 100 and flows to the sound absorbing member 130, it will cause an impact on the sound absorbing member 130, which may easily cause the sound absorbing member 130 to be damaged or directly fall off from the outer wall of the volute, thereby seriously affecting the noise reduction effect of the volute. By adopting the volute of the embodiment of the utility model, since the fixing plate 140 is fixedly installed on the volute body 100, and the sound absorbing member 130 is sandwiched between the side wall of the volute body 100 and the fixing plate 140, when the high-speed and high-pressure airflow in the wind cavity 110 passes through the first noise reduction hole 121 and the sound absorbing member 130, the setting of the fixing plate 140 can strengthen the fixation of the sound absorbing member 130, and reduce the risk of the high-speed and high-pressure airflow passing through the first noise reduction hole 121 causing an impact on the sound absorbing member 130, causing the sound absorbing member 130 to fall off from the side wall of the volute.

[0044] It is understandable that the above-mentioned sound absorbing member 130 can specifically be sound absorbing cotton. Of course, in addition to this, the sound absorbing member 130 can also be selected from materials with absorption functions such as sponge, aluminum silicate cotton, petroleum fiber cotton, glass fiber cotton, fiber blanket, etc., and the utility model does not make specific limitations on this.

[0045] Reference Figures 1 to 4 In some embodiments, a side surface of the fixing plate 140 has a receiving groove 142 , the second noise reduction hole 141 is opened on the bottom wall of the receiving groove 142 , the sound absorbing member 130 is embedded in the receiving groove 142 , and the periphery of the receiving groove 142 abuts against the volute body 100 .

[0046] By adopting the above structure, by setting the accommodating groove 142 on the fixing plate 140, the sound absorbing member 130 is embedded in the accommodating groove 142, and the peripheral edge of the accommodating groove 142 is abutted against the volute body 100, thereby the sound absorbing member 130 can be well fixed and limited, which can not only prevent the sound absorbing member 130 from shifting and falling off from the side wall of the volute under the impact of high-speed and high-pressure airflow, but also prevent the sound absorbing member 130 from leaking out and affecting the appearance and noise reduction effect.

[0047] It can be understood that one side of the fixed plate 140 has a receiving groove 142. Specifically, the receiving groove 142 can be formed by bending the peripheral edges of the fixed plate 140, thereby making the processing of the fixed plate 140 simpler and more convenient. Of course, in addition to this, the receiving groove 142 can also be formed by stamping or casting, etc., and the present invention does not make specific limitations on this.

[0048] Reference Figures 1 to 4 In some embodiments, the periphery of the accommodating groove 142 has a connecting portion 143 extending outward, and the connecting portion 143 is fixedly connected to the outer side wall of the volute body 100 by fasteners.

[0049] By adopting the above structure, the arrangement of the connecting portion 143 makes the installation and fixation of the fixing plate 140 simpler and more convenient.

[0050] It can be understood that the connection portion 143 is fixedly connected to the outer wall of the volute body 100 by fasteners, wherein the fasteners can specifically be fastening structures such as screws, bolts, rivets, and clips, which are not specifically limited in the present invention.

[0051] It is understandable that the periphery of the receiving groove 142 has a connecting portion 143 extending outward, wherein the connecting portion 143 can be formed by bending the periphery of the receiving groove 142 outward, thereby making the processing of the fixing plate 140 simpler and more convenient. Of course, in addition to this, the connecting portion 143 can also be directly welded to the periphery of the receiving groove 142, and the present invention does not make specific limitations on this.

[0052] Reference Figures 1 to 4 In some embodiments, the number of the noise reduction zones 120 is two, and each noise reduction zone 120 is provided with a sound absorbing member 130 and a fixing plate 140 .

[0053] In the above structure, two noise reduction zones 120 are set, and the outer wall of each noise reduction zone 120 is provided with a sound absorbing member 130 and a fixing plate 140, and the sound absorbing member 130 is clamped between the corresponding noise reduction zone 120 and the fixing plate 140, so that the sound absorbing member 130 can more comprehensively cover the outer wall of the volute body 100, increase the noise reduction range, and thus further improve the noise reduction effect of the volute.

[0054] It is understandable that the two noise reduction areas 120 can be respectively arranged on two opposite sides of the volute body 100, thereby achieving a better noise reduction effect.

[0055] It is understandable that the number of the above-mentioned noise reduction areas 120 is two, which is only for Figures 1 to 4 The number of the noise reduction zones 120 may be two, three, four, five or more, which is not specifically limited in the present invention.

[0056] Reference Figures 1 to 4 In some embodiments, the volute body 100 has a first side plate 101, a second side plate 102 and a third side plate 103, the first side plate 101 and the second side plate 102 are arranged opposite to each other, the third side plate 103 is sandwiched between the first side plate 101 and the second side plate 102, and the air cavity 110 is formed by the first side plate 101, the second side plate 102 and the third side plate 103. At least one noise reduction area 120 is located on the third side plate 103.

[0057] When the fan is working, the motor 200 drives the impeller 300 to rotate in the volute to form a negative pressure, thereby pushing the gas at the air inlet 111 to flow along the third side plate 103 and be discharged from the air outlet 112. By adopting the volute of the embodiment of the utility model, at least one noise reduction area 120 is located on the third side plate 103, that is, the side wall of the third side plate 103 is provided with a plurality of first noise reduction holes 121, the fixed plate 140 is fixedly installed on the third side plate 103 and is provided with a plurality of second noise reduction holes 141, and the sound absorbing member 130 is clamped between the third side plate 103 and the fixed plate 140, thereby being able to better absorb the noise inside the wind cavity 110 and achieving a better noise reduction effect.

[0058] It is understandable that, in addition to being disposed on the third side panel 103 , the noise reduction area 120 may also be disposed on the first side panel 101 or the second side panel 102 , and the present invention does not make any specific limitation on this.

[0059] In some embodiments, the diameter of the first noise reduction holes 121 is 4 mm-8 mm, and the center distance between two adjacent first noise reduction holes 121 is 8 mm-16 mm.

[0060] By adopting the above structure, the diameter of the first noise reduction hole 121 is set to 4mm-8mm, and the center distance between two adjacent first noise reduction holes 121 is set to 8mm-16mm, so that the noise in the wind cavity 110 can pass through the first noise reduction hole 121 and be absorbed by the sound absorbing member 130, thereby improving the noise reduction effect of the volute. In addition, the structure can also reduce the risk of the airflow and oil smoke in the wind cavity 110 flowing out of the first noise reduction hole 121, that is, it can reduce the risk of air leakage and oil leakage.

[0061] It is understandable that the diameter of the first noise reduction hole 121 is preferably 5 mm, and the center distance between two adjacent first noise reduction holes 121 is preferably 10 mm. Referring to the table below, it can be seen that the noise test value under this parameter design is low, the air volume is high, and the static pressure and efficiency are also high, that is, the ventilation effect and noise reduction effect are good, and the risk of air leakage and oil leakage is low.

[0062]

[0063] Reference Figures 5 to 8 The utility model further provides a fan in one embodiment, which includes a motor 200, an impeller 300 and a volute of any of the above embodiments. The motor 200 is installed in the volute, and the impeller 300 is located in the air cavity 110 and is in driving connection with the motor 200.

[0064] In the above structure, by adopting the volute of any of the above embodiments, the fixing plate 140 can fix and limit the sound absorbing member 130, and the sound absorbing member 130 can absorb the noise from the inside of the wind cavity 110 and the outside of the volute. In addition, the fixing plate 140 can also block the airflow passing through the sound absorbing member 130, thereby reducing the amount of air leaking from the sound absorbing member 130 to the outside of the volute, thereby increasing the wind pressure of the fan, so that the fan can better extract the oil smoke and discharge the oil smoke from the air outlet 112.

[0065] Reference Figures 5 to 8 In some embodiments, the air inlet 111 is located on the upper side wall of the volute, and an air inlet ring 150 extending toward the wind cavity is provided at the periphery of the air inlet 111. The horizontal height of the inner end of the air inlet ring 150 is flush with the horizontal height of one end of the impeller 300 close to the air inlet 111.

[0066] In the above structure, the setting of the air inlet circle 150 can play a role in drainage, guiding the external gas and oil smoke to flow quickly and smoothly from the air inlet 111 into the air cavity 110. By making the horizontal height of the inner end of the air inlet circle 150 flush with the horizontal height of the end of the impeller 300 close to the air inlet 111, it is possible to avoid the upper end of the impeller 300 blocking and disturbing the airflow flowing in from the air inlet 111, thereby achieving the effect of steady flow without turbulence.

[0067] Reference Figures 5 to 8 In some embodiments, the impeller 300 includes a plurality of blades 310 arranged at intervals along the circumference of the air cavity 110. In the vertical direction, all the blades 310 are arranged around the outer circumference of the air inlet 111. Each blade 310 is provided with an air guiding bevel 311 at one end close to the air inlet 111. The air guiding bevel 311 is located on the inner side of the blade 310 and is arranged downwardly inclined from the outside to the inside. The air inlet ring 150 has an arc surface with an opening facing the inside of the air cavity 110. The connecting line of the two ends of the opening of the arc surface at the relative position of the air inlet ring 150 and the blades 310 is the first straight line, the extension line of the air guiding bevel 311 is the second straight line, and the angle a between the first straight line and the corresponding second straight line is 35°-45°.

[0068] In the above structure, the wind guiding bevel 311 can play a role in stabilizing the flow, preventing the airflow from forming vortices at the air inlet 111 when the air is entering, thereby increasing the noise. By setting the angle a between the first straight line and the second straight line to 35°-45°, a better flow stabilizing effect can be achieved, rapid air suction can be achieved, and the airflow can be smoothly introduced into the air cavity 110.

[0069] It can be understood that the angle a between the first straight line and the second straight line is preferably 40°, at which point a better flow stabilization effect can be achieved.

[0070] An embodiment of the utility model further provides a range hood, which is provided with a fan according to any one of the above embodiments.

[0071] By adopting the fan of any of the above embodiments, the fan has a good noise reduction effect, thereby being able to reduce the noise generated when the range hood is working, optimize the cooking environment, reduce the adverse effects of noise on users, and enhance the user experience.

[0072] The embodiments of the present invention are described in detail above in conjunction with the accompanying drawings, but the present invention is not limited to the above embodiments, and various changes can be made within the knowledge scope of ordinary technicians in the relevant technical field without departing from the purpose of the present invention.

Claims

1. A volute, characterized in that: include: A volute body (100) having an air cavity (110), a side wall of the volute body (100) being provided with an air inlet (111) and an air outlet (112) connected to the air cavity (110), a side wall of the volute body (100) being provided with a noise reduction area (120), and a plurality of first noise reduction holes (121) arranged at intervals being provided in the noise reduction area (120); A sound absorbing member (130) is attached to the outer wall of the volute body (100) and covers the noise reduction area (120); A fixing plate (140) fixedly mounted on the volute body (100), the fixing plate (140) being provided with a plurality of second noise reduction holes (141) arranged at intervals; Wherein, the sound absorbing member (130) is sandwiched between the side wall of the volute body (100) and the fixing plate (140).

2. The volute according to claim 1, characterized in that: A side surface of the fixing plate (140) has a receiving groove (142), the second noise reduction hole (141) is opened on the bottom wall of the receiving groove (142), the sound absorbing member (130) is embedded in the receiving groove (142), and the periphery of the receiving groove (142) abuts against the volute body (100).

3. The volute according to claim 2, characterized in that: The periphery of the accommodating groove (142) has a connecting portion (143) extending outwards, and the connecting portion (143) is fixedly connected to the outer side wall of the volute body (100) via a fastener.

4. The volute according to claim 1, characterized in that: The number of the noise reduction areas (120) is at least two, and each of the noise reduction areas (120) is provided with the sound absorbing member (130) and the fixing plate (140).

5. The volute according to claim 4, characterized in that: The volute body (100) comprises a first side plate (101), a second side plate (102) and a third side plate (103); the first side plate (101) and the second side plate (102) are arranged opposite to each other, the third side plate (103) is sandwiched between the first side plate (101) and the second side plate (102); the air cavity (110) is formed by the first side plate (101), the second side plate (102) and the third side plate (103) mutually enclosing each other; Wherein, at least one of the noise reduction areas (120) is located on the third side plate (103).

6. The volute according to claim 1, characterized in that: The diameter of the first noise reduction holes (121) is 4 mm to 8 mm, and the center distance between two adjacent first noise reduction holes (121) is 8 mm to 16 mm.

7. A fan, characterized in that: It comprises a motor (200), an impeller (300), and a volute as claimed in any one of claims 1 to 6; The motor (200) is mounted on the volute, and the impeller (300) is located in the wind cavity (110) and is drivingly connected to the motor (200).

8. The fan according to claim 7, characterized in that: The air inlet (111) is located on the upper side wall of the volute, and an air inlet ring (150) extending toward the air cavity (110) is provided on the periphery of the air inlet (111), and the inner end of the air inlet ring (150) is flush with the horizontal height of an end of the impeller (300) close to the air inlet (111).

9. The fan according to claim 8, characterized in that: The impeller (300) comprises a plurality of blades (310) arranged at intervals along the circumference of the air cavity (110); in the vertical direction, all the blades (310) are arranged around the outer circumference of the air inlet (111); an end of each blade (310) close to the air inlet (111) is provided with an air guiding bevel (311); the air guiding bevel (311) is located on the inner side of the blade (310) and is arranged to tilt downward from the outside to the inside; The air inlet ring (150) has an arc surface with an opening facing the interior of the air cavity (110); The line connecting the two ends of the arc surface opening at the relative position between the air inlet ring (150) and the blade (310) is a first straight line, the extension line of the wind guide bevel (311) is a second straight line, and the angle a between the first straight line and the corresponding second straight line is 35°-45°.

10. A range hood, characterized in that: A fan as claimed in any one of claims 7 to 9 is provided.

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