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CN-224214393-U - Low-noise axial flow fan

CN224214393UCN 224214393 UCN224214393 UCN 224214393UCN-224214393-U

Abstract

The application discloses a low-noise axial flow fan which comprises a shell, a mounting seat, an impeller and a driving mechanism, wherein the mounting seat is fixed in the shell, the driving mechanism is connected with the mounting seat, the driving mechanism is connected with the impeller, the shell is connected with a guide cover, a plurality of guide strips arranged along an involute angle are arranged on the inner wall of the guide cover, the impeller comprises a hub and blades, the blades are provided with a plurality of sound absorbing holes, cutting teeth are arranged at the outer ends of the blades, and the involute guide strips are arranged to reduce the impact of air flow on the inner wall of the fan and effectively reduce impact noise.

Inventors

  • Sui Xianlin
  • SHI WENHAI

Assignees

  • 山东航弘智能科技有限公司

Dates

Publication Date
20260508
Application Date
20250529

Claims (10)

  1. 1. The low-noise axial flow fan comprises a shell, a mounting seat, an impeller and a driving mechanism, and is characterized in that the mounting seat is fixed in the shell and is connected with the driving mechanism, and the driving mechanism is connected with the impeller; The shell is connected with a guide cover, and a plurality of guide strips arranged along the involute angle are arranged on the inner wall of the guide cover; The impeller comprises a hub and blades, wherein the blades are provided with a plurality of sound absorption holes, and cutting teeth are arranged at the outer ends of the blades.
  2. 2. The low-noise axial flow fan according to claim 1, wherein the guide cover comprises a sound absorbing layer, a filling layer and an outer shell layer which are sequentially arranged from inside to outside, and the guide strips are arranged on the inner side of the sound absorbing layer.
  3. 3. The low-noise axial flow fan according to claim 2, wherein the sound absorbing layer is provided with a plurality of helmholtz resonators, the filling layer is a sound absorbing sponge layer, and the outer shell layer is a metal layer.
  4. 4. The low-noise axial flow fan according to claim 1, wherein the sound absorbing holes are formed in a honeycomb structure, and the opening direction of the sound absorbing holes is adapted to the curvature of the blades.
  5. 5. The low-noise axial flow fan as defined in claim 4, wherein the blade surface is sprayed with a porous layer of alumina-carbon nanotube composite, and the porous layer covers the sound absorbing holes.
  6. 6. The low-noise axial flow fan according to claim 1, wherein the mounting base is sequentially integrated with the elastic layer, the damping layer and the supporting layer from outside to inside.
  7. 7. The low noise axial flow fan of claim 6, wherein the damping layer is a polyurethane-carbon fiber composite sheet.
  8. 8. The low-noise axial flow fan according to claim 1, wherein a shock-absorbing washer is arranged at the joint of the blade and the hub, the shock-absorbing washer is compounded with piezoelectric fibers, the piezoelectric fibers are connected with electric wires, and the electric wires are connected with an electric shock device fixed on the hub.
  9. 9. The low-noise axial flow fan according to claim 8, wherein the damping washer is provided with a rubber layer on the outer layer and a rigid layer on the inner layer, the rubber layer and the rigid layer are nested, and piezoelectric fibers are compounded on the contact surface of the rubber layer with the blade and the contact surface of the rubber layer with the hub.
  10. 10. The low noise axial flow fan of claim 1, wherein the outermost end of the guide strip is also provided with stepped cutting teeth.

Description

Low-noise axial flow fan Technical Field The utility model belongs to the field of fans, and particularly relates to a low-noise axial flow fan. Background The axial flow fan is a common type of fan, and has a structure that a mounting seat is fixed in a shell, the motor is connected with the mounting seat, the motor is connected with an impeller, but the motor is rigidly connected with the impeller and the mounting seat, mechanical vibration can generate larger noise during operation, vibration generated by high-speed movement of air flow and impact with the impeller and the shell can generate larger noise when the fan converges air flow, sound pollution is caused, and hearing of workers is influenced, so that the axial flow fan with low noise is needed to be provided. Disclosure of utility model In order to solve the problems, the application provides a low-noise axial flow fan, which comprises a shell, a mounting seat, an impeller and a driving mechanism, wherein the mounting seat is fixed in the shell, the driving mechanism is connected with the mounting seat, and the driving mechanism is connected with the impeller; The shell is connected with a guide cover, and a plurality of guide strips arranged along the involute angle are arranged on the inner wall of the guide cover; The impeller comprises a hub and blades, the blades are provided with a plurality of sound absorption holes, and cutting teeth are arranged at the outer ends of the blades. The design of the cutting teeth is used for cutting off vortex generated by the air flow in movement during rotation of the blades, so that vibration noise during the air flow is further reduced, and the sound absorption holes absorb sound waves with a certain frequency by utilizing a porous principle. Further, the air guide sleeve comprises a sound absorption layer and a filling layer which are sequentially arranged from inside to outside, an outer shell layer and air guide strips which are arranged on the inner side of the sound absorption layer. Furthermore, the sound absorbing layer is provided with a plurality of Helmholtz resonant cavities, the filling layer is a sound absorbing sponge layer, the outer shell layer is a metal layer, the guide cover is also provided with the Helmholtz resonant cavities for sound absorption, sound firstly enters the Helmholtz resonant cavities for preliminary sound absorption, and then the sound absorbing sponge is utilized for further sound absorption, so that noise generated in airflow flowing is reduced to the greatest extent. Further, the sound absorbing holes are arranged in a honeycomb structure, and the opening direction of the sound absorbing holes is adapted to the radian of the blades. Further, the surface of the blade is sprayed with a porous layer compounded by alumina-carbon nano tubes, and the porous layer covers the sound absorption holes. The honeycomb structure and the porous layer form a series resonator to absorb noise through resonance, and the porous layer further expands the frequency of absorbing noise, so that sound waves are converted into heat energy and rapidly dissipated through the high heat conduction characteristic of the carbon nano tube, and a multi-band sound absorption effect is formed. Furthermore, the mounting seat is sequentially integrated with an elastic layer, a damping layer and a supporting layer from outside to inside, wherein the elastic layer adopts elastic structures such as a silica gel layer or a rubber layer, and the damping layer can consume vibration energy through friction or deformation. Furthermore, the damping layer is a polyurethane-carbon fiber composite sheet, mechanical energy is converted into heat energy through polyurethane molecular chain friction, and the carbon fiber can enhance damping efficiency, so that mechanical vibration between the motor and the mounting seat is effectively relieved. Furthermore, the connection part of the blade and the hub is provided with a damping washer, the damping washer is compounded with piezoelectric fibers, the piezoelectric fibers are connected with wires, the wires are connected with an electric shock device fixed on the hub, and mechanical vibration generated when the blade rotates is transmitted to the piezoelectric fibers, so that crystals in the piezoelectric fibers are changed to generate voltage, and the mechanical energy is converted into electric energy and consumed. Furthermore, the damping gasket is provided with a rubber layer on the outer layer and a rigid layer on the inner layer, the rubber layer and the rigid layer are nested, the contact surface of the rubber layer with the blade and the contact surface of the rubber layer with the hub are compounded with piezoelectric fibers, the large-amplitude vibration can be effectively absorbed by high-elasticity structures such as rubber, and the rest vibration generates voltage through the internal crystal change of the piezoelectric fibers and is converted into electric