CN-224228950-U - Centrifugal fan and range hood

Abstract

The utility model belongs to the technical field of range hoods, and particularly relates to a centrifugal fan and a range hood. The centrifugal fan has the advantages that the inner wall surface of the volute body is smoother due to the characteristic of lower roughness of the plastic surface, the fluid mechanical property is met, the friction and turbulence of air flow are reduced, the air flow is smoother, the overall performance of the fan is improved, in addition, the volute structure is easier to mold by adopting an integral injection molding mode, the realization of volute production design parameters is more met, the relative precision is higher during product molding, and structures such as involute, volute tongue and the like are more matched with the theoretical height. The air exhauster is assembled on the inner side of the cover plate and assembled in the volute body along with the cover plate, so that the production and assembly process is simplified, and the production and the manufacture are convenient. Moreover, the cover plate made of metal material provides stable support for the volute body, so that the overall structural strength can be effectively improved, and the stronger support is improved for installing the exhaust fan.

Inventors

• SHI FAEN
• TIAN XIAORONG
• LI CHANGQI
• YANG CHUNHUA
• Ai Baohua
• Liu Binguan
• Mai Jiaju

Assignees

• 佛山市丁普乐电器有限公司

Dates

Publication Date

20260512

Application Date

20250512

Claims (15)

1. 1. The centrifugal fan is characterized by comprising a volute body, a cover plate and an air exhauster, wherein the side part of the volute body is provided with an opening, the volute body is formed by integral injection molding, the volute body is made of plastics, the cover plate is made of metal, the volute body is provided with an air inlet collector positioned in the middle of the front side and an air outlet positioned at the outer end of a spiral line of the volute body, the cover plate is used for covering the side opening of the volute body, the air exhauster is assembled on the inner side of the cover plate and assembled in the volute body along with the cover plate, the air inlet collector and the air exhauster are correspondingly arranged, the air exhauster comprises a motor and an impeller, and the impeller is connected with the output end of the motor.
2. 2. The centrifugal fan according to claim 1, wherein the inner wall of the volute body is polished, and a plurality of fixing brackets for placing and fixing the centrifugal fan are arranged on the outer side of the cover plate.
3. 3. The centrifugal fan according to claim 1, wherein the spiral outer end of the volute body is provided with an air outlet diffuser, the height of the air outlet diffuser is H, the included angle between the connecting line of the center of the inlet section of the air outlet diffuser and the center of the outlet section of the air outlet diffuser and the air outlet direction is E, and the included angle between the center line of the inlet section of the air outlet diffuser and the connecting line of one side of the air outlet diffuser is B; the outer end of the spiral line of the volute body is provided with an air outlet diffuser, the air outlet is formed at the outlet of the air outlet diffuser, the inlet section of the air outlet diffuser is polygonal, the outlet section of the air outlet diffuser is circular, or the inlet section of the air outlet diffuser is circular, and the outlet section of the air outlet diffuser is polygonal; The connecting line between the inlet section and the outlet section of the air outlet diffuser is twisted along the air outlet direction, and the twisting angle is 1-60 degrees.
4. 4. A centrifugal fan according to claim 3, wherein a volute tongue arranged along the axial direction is arranged at a joint of the inner wall of the volute body adjacent to the air outlet diffuser, the volute tongue is of a short tongue solid structure, and the length of the volute tongue is matched with the width of the volute body; the width B of the volute is 100 mm-240 mm; opening A of the spiral line termination section of the volute body is 60-80 mm.
5. 5. The centrifugal fan according to claim 4, wherein the length of the volute tongue extending into the volute body is 1/20-1/5.
6. 6. The centrifugal fan according to claim 4, wherein an outlet diameter D2 of the impeller is 170 mm-210 mm, and a gap t= (0.05-0.06) D2 between an outer end of the volute tongue and an outer circumference of the impeller; And the clearance t between the outer end of the volute tongue and the outer circumference of the impeller is 8.5 mm-12.6 mm.
7. 7. The centrifugal fan according to claim 1, wherein the outlet size of the volute body is [80,115] mm [160,200] mm, the outlet length L of the volute body is 130-170 mm, the diffusion angle of the air inlet current collector is 30-50 degrees, and the maximum outer diameter of the volute is 200-350 mm.
8. 8. A centrifugal fan according to claim 3, wherein the outlet diffuser has a diffusion angle of 7 ° to 15 °, and the diffuser has a height of 55mm to 110mm.
9. 9. The centrifugal fan of claim 1, wherein the cover plate is in positioning engagement with the volute body opening by a socket structure.
10. 10. The centrifugal fan of claim 9, wherein the socket structure has a coverage area of not less than 2/3 of a volute body opening edge length.
11. 11. The centrifugal fan of claim 9, wherein the socket structure comprises a positioning flange arranged on the periphery of the cover plate and a positioning slot arranged on the periphery of one side close to the opening of the volute body, and the positioning flange is inserted into the positioning slot when the cover plate is assembled with the volute body.
12. 12. The centrifugal fan according to claim 8, wherein a plurality of first connecting seats are arranged at the edge of one side of the opening of the volute body, the first connecting seats are provided with first connecting holes, a second connecting seat is arranged on the periphery of the cover plate, second connecting holes are formed in the second connecting seats, and the first connecting holes and the second connecting holes are fixed through fasteners.
13. 13. The centrifugal fan of claim 1, wherein the cover plate is detachably connected to the side opening of the scroll body, and a decorative surface is provided on an outer side wall of the cover plate, and the decorative surface is an antibacterial coating or an oil-resistant coating.
14. 14. A centrifugal fan according to claim 3, wherein a supporting member is arranged at the outlet of the air outlet diffuser, two ends of the supporting member are respectively connected with the inner wall of the air outlet diffuser, a limit clamping block is arranged above the connection part of the supporting member and the air outlet diffuser, and the limit clamping block and the supporting member are used for installing and limiting a valve.
15. 15. The range hood is characterized by comprising a range hood body and a smoke exhaust structure arranged at the top of the range hood body, wherein the smoke exhaust structure comprises a smoke exhaust channel communicated with a range hood cavity of the range hood body and a centrifugal fan according to any one of claims 1 to 14, and the centrifugal fan is arranged in the smoke exhaust channel.

Description

Centrifugal fan and range hood Technical Field The utility model belongs to the technical field of range hoods, and particularly relates to a centrifugal fan and a range hood. Background The manufacturing of the volute body of the centrifugal fan of the traditional Chinese smoke ventilator mainly depends on two traditional processes, namely metal butt-welding fixation and metal hemming riveting, but has obvious technical defects, wherein the metal butt-welding process is low in reliability, high-precision welding equipment and skilled operators are required to be relied on, problems of poor welding, poor welding removal and the like are prone to occur, the formed shell structure is poor in tightness, large gaps exist in non-welded areas, air leakage and oil drop leakage risks are caused, oil stains are accumulated in the gaps after long-term use, the air outlet efficiency of the fan is directly affected, secondary processing defects are that welding burrs are difficult to thoroughly remove, scratch hidden dangers are prone to be caused, and local stress concentration aggravates operation vibration and noise. The metal hemming riveting process has the advantages of high production cost, large hemming equipment investment, complex process, low production efficiency, insufficient molding dimensional precision, unstable air outlet caused by large molding deviation of key parts such as a volute tongue and the like, easy airflow disorder and performance attenuation during long-term operation, and poor process compatibility, and is difficult to meet the fine design requirements of hydrodynamic structures such as involute of a spiral line of a volute, curvature of the volute tongue and the like. The problems of low pneumatic efficiency, poor noise control, short service life and the like of the traditional centrifugal fan are caused by the technical defects. Therefore, there is a need for a blower volute structure that combines high precision molding, low friction runner design and ease of assembly. Disclosure of utility model The utility model aims to solve the problems of low production efficiency and low long-term use stability of a product of a volute body of an existing centrifugal fan of a range hood, and provides the centrifugal fan and the range hood with the volute body formed by injection molding. In order to achieve the above purpose, the present utility model adopts the following technical scheme: The centrifugal fan comprises a volute body, a cover plate and an air exhauster, wherein the side opening of the volute body is formed by integral injection molding, the volute body is made of plastic, the cover plate is made of metal, the volute body is provided with an air inlet current collector positioned in the middle of the front side and an air outlet positioned at the outer end of a spiral line of the volute body, the cover plate is used for covering the side opening of the volute body, the air exhauster is assembled on the inner side of the cover plate and assembled in the volute body along with the cover plate, the air inlet current collector and the air exhauster are correspondingly arranged, the air exhauster comprises a motor and an impeller, and the impeller is connected with the output end of the motor. Compared with the prior art, the centrifugal fan has the advantages that the volute body is formed by integral injection molding, the inner wall surface of the volute body is smoother due to the characteristic of lower roughness of the plastic surface, the fluid mechanical property is met, the generation of air flow friction and turbulence is reduced, the air flow is smoother, the overall performance of the fan is improved, in addition, the volute structure is easier to form by adopting an integral injection molding mode, the realization of volute production design parameters is more met, the relative precision is higher during product forming, and structures such as involute and volute tongue are more consistent with the theoretical height. The air exhauster is assembled on the inner side of the cover plate and assembled in the volute body along with the cover plate, so that the assembly process is simplified, the production and the manufacture are convenient, and the wind power loss for adjusting the air outlet direction is small. Moreover, the cover plate made of metal material provides stable support for the volute body, so that the overall structural strength can be effectively improved, and the stronger support is improved for installing the exhaust fan. Furthermore, the cover plate is made of iron materials, and through the arrangement, the cover plate made of metal materials provides stable support for the volute body, so that the overall structural strength can be effectively improved, the firmer support is improved for installing the air exhauster, and the plastic volute body fully utilizes the characteristic of smoothness of plastic to reduce wind resistance. Further, the height of the