Centrifugal fan system and range hood

Abstract

The utility model relates to a centrifugal fan system and a range hood. Relates to the technical field of range hoods. The centrifugal fan specifically comprises a volute assembly, an impeller assembly arranged in the volute assembly and a motor assembly arranged at the bottom of the volute assembly. An air inlet is formed in the volute assembly in the axial direction, an air outlet is formed in the volute assembly in the radial direction, the motor assembly is used for driving the impeller assembly to rotate, the impeller assembly rotates and is used for sucking air from the air inlet and sending out the air from the air outlet, and a noise reduction part is arranged on the impeller assembly and used for reducing vortex noise in the volute assembly. According to the centrifugal fan system, the noise reduction part is arranged on the impeller assembly, the vortex noise generated when the impeller assembly rotates at a high speed can be reduced through the noise reduction part, and therefore the noise generated when the centrifugal fan system operates at a high speed is effectively reduced, and the use experience of a user is improved.

Description

Technical Field

[0001] The utility model relates to the technical field of range hoods, in particular to a centrifugal fan system and a range hood. Background Art

[0002] A range hood is a kitchen appliance for purifying the kitchen environment. It is usually installed above the kitchen stove and can quickly extract the oil fume generated during cooking. Due to its characteristics such as large flow rate, high pressure, and compact structure, a centrifugal fan is widely used in range hoods. As the core device of the range hood, the design of the centrifugal fan is related to the performance of the whole range hood.

[0003] With the improvement of living standards, people's requirements for range hoods are getting higher and higher. It should not only have a good effect of sucking oil fume but also meet the requirement of low noise. Therefore, the centrifugal fans used in range hoods are also developing towards the trend of high speed and low noise. However, the existing centrifugal fans will generate relatively large noise during high-speed operation, thus bringing a poor user experience and unable to meet the current production requirements. Summary of the Utility Model

[0004] The purpose of the utility model is to provide a centrifugal fan system and a range hood for the above-mentioned deficiencies of the existing technology, which can effectively reduce the noise generated by the centrifugal fan system during high-speed operation, thereby improving the user experience.

[0005] The utility model provides a centrifugal fan system, which includes a volute component, an impeller component arranged in the volute component, and a motor component arranged at the bottom of the volute component; the volute component is axially provided with an air inlet and radially provided with an air outlet, the motor component is used to drive the impeller component to rotate, and the impeller component rotates to suck air from the air inlet and send it out from the air outlet. A noise reduction member is arranged on the impeller component, and the noise reduction member is used to reduce the noise generated during the operation of the impeller component.

[0006] Furthermore, the volute component includes a volute main body and an air outlet pipe arranged radially along the volute main body. The impeller component is arranged inside the volute main body, the motor component is arranged at the bottom of the volute main body, the air inlet includes a main air inlet formed at the top of the volute main body and a secondary air inlet formed at the bottom of the volute main body, and the air outlet is formed in the air outlet pipe.

[0007] Further, the impeller assembly includes a plurality of blades arranged at equal circumferential intervals, two impeller side discs respectively connecting the tops and bottoms of the plurality of blades, an impeller middle disc connecting the middles of the blades, and a flange disc with its inner side connected to the motor assembly. The outer side of the flange disc is connected to the impeller middle disc to drive the plurality of blades to rotate when the motor assembly is started. The noise reduction member is provided on the plurality of blades.

[0008] Further, the noise reduction member includes a vortex elimination portion provided at the trailing edges of the plurality of blades and a buffer portion provided at the leading edges of the plurality of blades. The vortex elimination portion is used to eliminate the vortices generated in the central region of the volute assembly, and the buffer portion is used to reduce the air flow impact at the air inlet.

[0009] Further, the vortex elimination portion is a plurality of continuous sawteeth axially arranged at the trailing edges of the blades.

[0010] Further, the buffer portion is an upper edge bevel provided at the top of the leading edge of the blade and a lower edge bevel provided at the bottom of the leading edge of the blade.

[0011] Further, a rectifying portion is further provided at the leading edges of the plurality of blades, and the rectifying portion is used to rectify the air flow entering from the air inlet.

[0012] Further, the rectifying portion is a plurality of continuous sawteeth axially arranged at the leading edges of the blades.

[0013] Further, the motor assembly includes a driving motor for providing driving force for the rotation of the impeller assembly and a motor bracket for fixedly mounting the driving motor at the bottom of the volute main body. The driving shaft of the driving motor is connected to the inner side of the flange disc, and the secondary air inlet is formed between the motor bracket and the volute main body.

[0014] The present utility model further provides a range hood, including the above-mentioned centrifugal fan system.

[0015] The centrifugal fan system and the range hood of the present utility model have the following beneficial effects:

[0016] (1) A noise reduction member is provided on the impeller assembly of the centrifugal fan system. Through the noise reduction member, the vortex noise generated when the impeller assembly rotates at high speed can be reduced, thereby effectively reducing the noise generated by the centrifugal fan system during high-speed operation, and further improving the user experience;

[0017] (2) The air inlet of the centrifugal fan system includes a main air inlet and a secondary air inlet. When the impeller assembly rotates to form a negative pressure inside the volute main body, external air is simultaneously sucked into the inside of the volute main body from the main air inlet and the secondary air inlet, thereby increasing the air suction volume of the centrifugal fan system and improving the effect of the range hood in extracting oil fumes.

[0018] (3) The impeller assembly of this centrifugal fan system includes multiple blades, two impeller side discs, an impeller middle disc, and a flange disc. The multiple blades are arranged at equal circumferential intervals. One impeller side disc connects the tops of the multiple blades, and the other impeller side disc connects the bottoms of the multiple blades. The impeller middle disc connects the middles of the multiple blades, so that the multiple blades enclose a circle to form an integral structure;

[0019] (4) The noise reduction component of this centrifugal fan system includes a vortex elimination part provided at the trailing edges of the multiple blades. When the multiple blades rotate at high speed with the central axis of the flange disc as the rotation center, the vortex elimination part eliminates the vortices formed at the trailing edges of the multiple blades, thereby reducing the vortex noise formed in the vortex area, and further effectively reducing the noise generated when the centrifugal fan system operates at high speed, and improving the user experience;

[0020] (5) The noise reduction component of this centrifugal fan system also includes a buffer part provided at the leading edges of the multiple blades. The buffer part buffers the impact of the outside air on the leading edges of the multiple blades, thereby not only improving the stability of the blade rotation, ensuring the air extraction effect of the centrifugal fan system, but also reducing the noise generated by the impact of the outside air on the blades, and further effectively reducing the noise generated when the centrifugal fan system operates at high speed, and improving the user experience;

[0021] (6) A rectifying part is also provided at the leading edges of the multiple blades of this centrifugal fan system. When a large amount of outside air is inhaled into the interior of the volute main body from the air inlet, the rectifying part located at the leading edges of the multiple blades rectifies the air entering the interior of the volute main body, making the air flow inside the volute main body more uniform, improving its aerodynamic performance, so that this centrifugal fan system can better discharge the air inside the volute main body through the air outlet, and further improving the effect of the range hood in extracting oil fumes. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] The drawings incorporated into the specification and constituting a part of the specification illustrate embodiments of the present invention and are used together with the description to explain the principles of the present invention. In these drawings, like reference numerals are used to represent like elements.

[0023] Figure 1 is an exploded view of a centrifugal fan system according to an embodiment of the present invention;

[0024] Figure 2 is a structural schematic diagram of a centrifugal fan system according to an embodiment of the present invention;

[0025] Figure 3 is a structural schematic diagram of a volute assembly of a centrifugal fan system according to an embodiment of the present invention;

[0026] Figure 4Schematic structural diagram of an impeller assembly of a centrifugal fan system according to an embodiment of the present utility model;

[0027] Figure 5 Schematic structural diagram of a blade of a centrifugal fan system according to an embodiment of the present utility model;

[0028] Figure 6 Schematic structural diagram of a motor assembly of a centrifugal fan system according to an embodiment of the present utility model.

[0029] In the figure: 1. Volute assembly; 11. Volute main body; 111. Air inlet; 1111. Main air outlet; 1112. Secondary air outlet; 12. Air outlet pipe; 121. Air outlet; 2. Impeller assembly; 21. Blade; 211. Vortex elimination part; 212. Upper edge bevel cut; 213. Lower edge bevel cut; 214. Rectifying part; 22. Impeller side disc; 23. Impeller middle disc; 24. Flange; 3. Motor assembly; 31. Driving motor; 311. Driving shaft; 32. Motor bracket. Detailed implementation manners

[0030] To make the objectives, technical solutions, and advantages of the embodiments of the present utility model clearer, the technical solutions in the embodiments of the present utility model will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present utility model. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present utility model without making creative efforts shall fall within the protection scope of the present utility model.

[0031] Please refer to Figures 1 to 6 , a centrifugal fan system according to an embodiment of the present utility model includes a volute assembly 1, an impeller assembly 2 disposed within the volute assembly 1, and a motor assembly 3 disposed at the bottom of the volute assembly 1; the volute assembly 1 is axially provided with an air inlet 111 and radially provided with an air outlet 121, the motor assembly 3 is used to drive the impeller assembly 2 to rotate, and the impeller assembly 2 rotates to suck air from the air inlet 111 and send it out from the air outlet 121, and a noise reduction member is provided on the impeller assembly 2, and the noise reduction member is used to reduce the noise generated when the impeller assembly 2 operates.

[0032] In the present application, the centrifugal fan system includes a volute assembly 1, an impeller assembly 2, and a motor assembly 3. The impeller assembly 2 is disposed within the volute assembly 1, and the motor assembly 3 is disposed at the bottom of the volute assembly 1. An air inlet 111 is axially provided on the volute assembly 1, and an air outlet 121 is radially provided. The motor assembly 3 is connected to the impeller assembly 2, and the impeller assembly 2 is driven to rotate by the motor assembly 3, thereby forming a negative pressure within the volute assembly 1, sucking external air into the volute assembly 1 through the air inlet 111, and then discharging the air sucked into the volute assembly 1 from the air outlet 121 by the centrifugal force formed by the rotation of the impeller assembly 2.

[0033] In this embodiment, an oil fume extractor is further provided, which includes the above-mentioned centrifugal fan system. The centrifugal fan system sucks external air from the air inlet 111 and discharges it from the air outlet 121, thereby realizing the function of the oil fume extractor to suck oil fumes. As the core device of the oil fume extractor, the design of the centrifugal fan is related to the performance of the whole oil fume extractor. With the improvement of living standards, people's requirements for the oil fume extraction effect of the oil fume extractor are also getting higher and higher. Therefore, the centrifugal fan system used in the oil fume extractor is also developing towards the trend of high speed.

[0034] By increasing the rotational speed of the centrifugal fan system and increasing the air suction volume of the centrifugal fan system, although the effect of the oil fume extractor in extracting oil fumes can be improved, when the centrifugal fan operates at high speed, it will generate relatively large noise, thus bringing a poor user experience and unable to meet the current production requirements. Therefore, in this application, a noise reduction component is provided on the impeller assembly 2 of the centrifugal fan system. Through the noise reduction component, the eddy current noise generated when the impeller assembly 2 rotates at high speed can be reduced, thereby effectively reducing the noise generated when the centrifugal fan system operates at high speed, and further improving the user experience.

[0035] In this embodiment, the volute assembly 1 includes a volute main body 11 and an air outlet duct 12 arranged radially along the volute main body 11. The air inlet 111 includes a main air inlet 1111 formed at the top of the volute main body 11 and a secondary air inlet 1112 formed at the bottom of the volute main body 11. The air outlet 121 is formed in the air outlet duct 12. In this application, the volute assembly 1 includes a volute main body 11 and an air outlet duct 12. The air inlet 111 communicates the inside of the volute main body 11 with the outside along the axial direction, and the air outlet duct 12 is arranged radially along the volute main body 11, so that an air outlet 121 communicating the inside of the volute main body 11 with the outside along the radial direction is formed in the air outlet duct 12.

[0036] The impeller assembly 2 is arranged inside the volute main body 11, and the motor assembly 3 is arranged at the bottom of the volute main body 11 and is connected to the impeller assembly 2 inside the volute main body 11. Thus, the impeller assembly 2 is driven to rotate by the motor assembly 3, so that a negative pressure is formed inside the volute main body 11, sucking external air from the air inlet 111 into the inside of the volute main body 11, and under the action of the centrifugal force formed by the rotation of the impeller assembly 2, discharging the air sucked into the inside of the volute main body 11 from the air outlet 121.

[0037] In the present application, the air inlet 111 includes a main air inlet 1111 and a secondary air inlet 1112. The main air inlet 1111 is formed at the top of the volute main body 11 and communicates the interior of the volute main body 11 with the outside along the axial direction of the volute main body 11. The secondary air inlet 1112 is formed at the bottom of the volute main body 11, and at the same time, the secondary air inlet 1112 also communicates the interior of the volute main body 11 with the outside along the axial direction of the volute main body 11, so as to rotate the impeller assembly 2. When a negative pressure is formed inside the volute main body 11, outside air is simultaneously inhaled into the interior of the volute main body 11 from the main air inlet 1111 and the secondary air inlet 1112, thereby increasing the air intake volume of the centrifugal fan system and enhancing the effect of the range hood in extracting oil fumes.

[0038] In this embodiment, the impeller assembly 2 includes a plurality of blades 21 arranged at equal intervals in the circumferential direction, two impeller side discs 22 respectively connecting the tops and bottoms of the plurality of blades 21, an impeller middle disc 23 connecting the middles of the blades 21, and a flange 24 connected to the motor assembly 3 at the inner side. The outer side of the flange 24 is connected to the impeller middle disc 23, so as to drive the plurality of blades 21 to rotate when the motor assembly 3 is started, and a noise reduction member is provided on the plurality of blades 21.

[0039] In the present application, the impeller assembly 2 includes a plurality of blades 21, two impeller side discs 22, an impeller middle disc 23 and a flange 24. The plurality of blades 21 are arranged at equal distances in the circumferential direction. One impeller side disc 22 connects the tops of the plurality of blades 21, and the other impeller side disc 22 connects the bottoms of the plurality of blades 21. The impeller middle disc 23 connects the middles of the plurality of blades 21, so that the plurality of blades 21 enclose a circle to form an integral structure.

[0040] The inner side of the flange 24 is connected to the motor assembly 3, and the outer side is connected to the impeller middle disc 23. When the motor assembly 3 operates, it drives the integral structure formed by the plurality of blades 21, the two impeller side discs 22 and the impeller middle disc 23 to perform circumferential rotation with the central axis of the flange 24 as the rotation center, thereby forming a negative pressure inside the volute main body 11, and inhaling outside air into the interior of the volute main body 11 through the main air inlet 1111 and the secondary air inlet 1112, thereby increasing the air intake volume of the centrifugal fan system and enhancing the effect of the range hood in extracting oil fumes.

[0041] In this embodiment, the noise reduction member includes a vortex elimination portion 211 provided at the trailing edge of the plurality of blades 21, and a buffer portion provided at the leading edge of the plurality of blades 21. The vortex elimination portion 211 is used to eliminate the vortices generated in the central region of the volute assembly 1, and the buffer portion is used to reduce the air flow impact of the air inlet 111. In the present application, when the impeller assembly 2 is arranged inside the volute main body 11, the side of the plurality of blades 21 close to the air inlet is the leading edge of the blades 21, and the side close to the air outlet is the trailing edge of the blades 21.

[0042] When the motor assembly 3 drives the overall structure formed by a plurality of blades 21, two impeller side discs 22 and an impeller middle disc 23 to rotate at high speed through the flange 24, a vortex area is likely to be generated at the trailing edge position of the plurality of blades 21, and the vortex noise formed in the vortex area will affect the user experience.

[0043] Therefore, in the present application, the noise reduction member includes a vortex elimination portion 211, and the vortex elimination portion 211 is arranged at the trailing edge of the plurality of blades 21. Thus, when the plurality of blades 21 rotate at high speed with the central axis of the flange 24 as the rotation center, the vortex formed at the trailing edge of the plurality of blades 21 is eliminated through the vortex elimination portion 211, thereby reducing the vortex noise formed in the vortex area, and further effectively reducing the noise generated when the centrifugal fan system operates at high speed, and improving the user experience.

[0044] Also, since the impeller assembly 2 rotates at high speed to form a negative pressure inside the volute main body 11, when the outside air enters the inside of the volute main body 11 through the air inlet 111, the suction force generated by the negative pressure is relatively large, and a large amount of outside air is rapidly sucked into the inside of the volute main body 11. At this time, the air entering the inside of the volute main body 11 will impact the leading edge of the plurality of blades 21, which not only affects the rotation stability of the plurality of blades 21, thereby affecting the air extraction effect of the centrifugal fan system, but also generates a large amount of noise due to the impact, thus affecting the user experience.

[0045] Therefore, in the present application, the noise reduction member further includes a buffer portion, and the buffer portion is arranged at the leading edge of the plurality of blades 21. Thus, when a large amount of outside air is rapidly sucked into the inside of the volute main body 11, the impact between the outside air and the leading edge of the plurality of blades 21 is buffered through the buffer portion, thereby not only improving the rotation stability of the blades 21, ensuring the air extraction effect of the centrifugal fan system, but also reducing the noise generated by the impact between the outside air and the blades 21, and further effectively reducing the noise generated when the centrifugal fan system operates at high speed, and improving the user experience.

[0046] Specifically, in this embodiment, the vortex elimination portion 211 is a plurality of continuous sawteeth arranged axially at the trailing edge of the blade 21. When the motor assembly 3 drives the plurality of blades 21 to rotate at high speed, the plurality of continuous sawteeth arranged axially at the trailing edge of the blade 21 cut the vortex formed at the trailing edge of the blade 21, thereby effectively eliminating the vortex formed at the trailing edge of the plurality of blades 21, reducing the vortex noise formed in the vortex area, and further effectively reducing the noise generated when the centrifugal fan system operates at high speed, and improving the user experience.

[0047] Since in this application, the air inlet 111 includes a main air inlet 1111 formed at the top of the volute main body 11 and a secondary air inlet 1112 formed at the bottom of the volute main body 11, when the plurality of blades 21 rotate to form a negative pressure inside the volute main body 11, the outside air is sucked into the inside of the volute main body 11 from the main air inlet 1111 and the secondary air inlet 1112. Therefore, the outside air entering the inside of the volute main body 11 will impact the top and bottom of the leading edges of the plurality of blades 21.

[0048] In this embodiment, the buffer portion includes an upper edge bevel 212 provided at the top of the leading edge of the blade 21 and a lower edge bevel 213 provided at the bottom of the leading edge of the blade 21. When the plurality of blades 21 rotate at high speed to form a negative pressure inside the volute main body 11 and suck a large amount of outside air into the inside of the volute main body 11 from the main air inlet 1111 and the secondary air inlet 1112 at the same time, the upper edge bevel 212 buffers the outside air entering from the main air inlet 1111, and the lower edge bevel 213 buffers the outside air entering from the secondary air inlet 1112. Thereby, it not only improves the rotation stability of the blade 21, ensures the air extraction effect of the centrifugal fan system, but also reduces the noise generated by the impact between the outside air and the blade 21, and further effectively reduces the noise generated by the centrifugal fan system during high-speed operation, improving the user experience.

[0049] In this embodiment, a rectifying portion 214 is further provided at the leading edge of the plurality of blades 21. When the plurality of blades 21 rotate at high speed and suck a large amount of outside air into the inside of the volute main body 11 from the air inlet 111, the rectifying portion 214 located at the leading edge of the plurality of blades 21 rectifies the air entering the inside of the volute main body 11, making the air flow inside the volute main body 11 more uniform and improving its aerodynamic performance. Thus, the centrifugal fan system can better discharge the air inside the volute main body 11 through the air outlet 121, and further improve the effect of the range hood in extracting oil fume.

[0050] Specifically, in this embodiment, the rectifying portion 214 is a plurality of continuous sawteeth axially arranged at the leading edge of the blade 21. When the plurality of blades 21 rotate at high speed, the plurality of continuous sawteeth located at the leading edge of the blade 21 rectify the air entering the inside of the volute main body 11, making the air flow inside the volute main body 11 more uniform and improving its aerodynamic performance. Thus, the centrifugal fan system can better discharge the air inside the volute main body 11 through the air outlet 121, and further improve the effect of the range hood in extracting oil fume.

[0051] In this embodiment, the motor assembly 3 includes a drive motor 31 for providing a driving force for the rotation of the impeller assembly 2, and a motor bracket 32 for fixedly mounting the drive motor 31 at the bottom of the volute main body 11. The drive shaft 311 of the drive motor 31 is connected to the inner side of the flange 24, and a secondary air inlet 1112 is formed between the motor bracket 32 and the volute main body 11. In this application, the motor assembly 3 includes the drive motor 31 and the motor bracket 32. By fixedly connecting the motor bracket 32 to the bottom of the volute main body 11, the drive motor 31 is fixedly mounted at the bottom of the volute main body 11.

[0052] The drive shaft 311 of the drive motor 31 extends into the volute main body 11 and is fixedly connected to the inner side of the flange 24, so that the central axis of the flange 24 coincides with the central axis of the drive shaft 311. Thus, when the drive motor 31 is powered on, the drive shaft 311 of the drive motor 31 rotates, driving the entire impeller assembly 2 to rotate inside the volute main body 11 with the central axis of the drive shaft 311 as the center of rotation, and further forming a negative pressure inside the volute main body 11.

[0053] The main air inlet 1111 is formed at the top of the volute main body 11 and connects the inside of the volute main body 11 with the outside. The secondary air inlet 1112 is formed between the bottom of the volute main body 11 and the motor bracket 32 and also connects the inside of the volute main body 11 with the outside. Thus, when a negative pressure is formed inside the volute main body 11, outside air is inhaled into the volute main body 11 through the main air inlet 1111 and the secondary air inlet 1112, and then, through the centrifugal force generated by the rotation of the impeller assembly 2, the air inside the volute main body 11 is radially thrown out, enabling the air to flow out of the volute main body 11 through the air outlet 121 formed in the air outlet duct 12 arranged radially along the volute main body 11, thereby realizing the function of the range hood for sucking oil fumes.

[0054] The content described above can be implemented alone or in various combinations, and these variant ways are all within the protection scope of the present utility model.

[0055] It should be noted that in this article, relative terms such as first and second are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any actual relationship or order between these entities or operations. Moreover, the terms "comprise", "include" or any other variant thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements not only includes those elements, but also includes other elements not explicitly listed, or elements inherent to this process, method, article or device. Without further limitation, an element defined by the statement "comprising an..." does not exclude the existence of additional identical elements in the process, method, article or device including the element.

[0056] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention, rather than limiting it. Although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. A centrifugal fan system, characterized in that: It includes a volute component (1), an impeller component (2) disposed within the volute component (1), and a motor component (3) disposed at the bottom of the volute component (1); the volute component (1) is axially provided with an air inlet (111) and radially provided with an air outlet (121), the motor component (3) is used to drive the impeller component (2) to rotate, and the impeller component (2) rotates to suck air from the air inlet (111) and send it out from the air outlet (121). A noise reduction member is provided on the impeller component (2), and the noise reduction member is used to reduce the noise generated when the impeller component (2) operates.

2. The centrifugal fan system as described in claim 1, wherein: The volute component (1) includes a volute main body (11) and an air outlet duct (12) arranged radially along the volute main body (11). The impeller component (2) is arranged inside the volute main body (11), and the motor component (3) is arranged at the bottom of the volute main body (11). The air inlet (111) includes a main air inlet (1111) formed at the top of the volute main body (11) and a secondary air inlet (1112) formed at the bottom of the volute main body (11). The air outlet (121) is formed in the air outlet duct (12).

3. A centrifugal fan system as described in claim 2, characterized in that: The impeller component (2) includes a plurality of blades (21) arranged equidistantly in the circumferential direction, two impeller side discs (22) respectively connecting the tops and bottoms of the plurality of blades (21), an impeller middle disc (23) connecting the middles of the blades (21), and a flange disc (24) with its inner side connected to the motor component (3). The outer side of the flange disc (24) is connected to the impeller middle disc (23) to drive the plurality of blades (21) to rotate when the motor component (3) starts. The noise reduction member is arranged on the plurality of blades (21).

4. A centrifugal fan system as described in claim 3, characterized in that: The noise reduction member includes a vortex elimination part (211) arranged at the trailing edge of the plurality of blades (21) and a buffer part arranged at the leading edge of the plurality of blades (21). The vortex elimination part (211) is used to eliminate the vortex generated in the central area of the volute component (1), and the buffer part is used to reduce the air flow impact of the air inlet (111).

5. A centrifugal fan system as described in claim 4, characterized in that: The vortex elimination part (211) is a plurality of continuous sawteeth arranged axially at the trailing edge of the blade (21).

6. A centrifugal fan system as described in claim 4, characterized in that: The buffer part is an upper edge bevel (212) arranged at the top of the leading edge of the blade (21) and a lower edge bevel (213) arranged at the bottom of the leading edge of the blade (21).

7. A centrifugal fan system as described in claim 3, characterized in that: A rectifying part (214) is also provided at the leading edge of the plurality of blades (21), and the rectifying part (214) is used to rectify the air flow entering from the air inlet (111).

8. A centrifugal fan system as described in claim 7, characterized in that: The rectifying part (214) is a plurality of continuous sawteeth arranged axially at the leading edge of the blade (21).

9. A centrifugal fan system as described in claim 3, characterized in that: The motor assembly (3) includes a drive motor (31) for providing a driving force for the rotation of the impeller assembly (2), and a motor bracket (32) for fixedly mounting the drive motor (31) at the bottom of the volute main body (11). The drive shaft (311) of the drive motor (31) is connected to the inner side of the flange plate (24), and the secondary air inlet (1112) is formed between the motor bracket (32) and the volute main body (11).

10. A range hood, characterized in that: It includes a centrifugal fan system according to any one of claims 1-9.

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