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CN-122014687-A - Fan for ventilation of automobile seat

CN122014687ACN 122014687 ACN122014687 ACN 122014687ACN-122014687-A

Abstract

The invention belongs to the technical field of fan noise reduction, and discloses a fan for ventilation of an automobile seat, which comprises a motor, wherein the motor drives an impeller to rotate, and also comprises odd blades which are unevenly distributed around the center of the impeller, the sizes of the blades are consistent, and compared with a traditional fan, the fan can effectively reduce the noise value of the fan by adopting uneven-pitch uneven distribution, and noise peaks corresponding to the passing frequency of the original blades are scattered and distributed without particularly obvious peaks, so that the noise value of the highest frequency point is reduced by more than 10 dB.

Inventors

  • LI YANLIN

Assignees

  • 深圳市鸿飞机电科技有限公司

Dates

Publication Date
20260512
Application Date
20241111

Claims (10)

  1. 1. A fan for ventilation of an automobile seat comprises a motor, wherein the motor drives an impeller to rotate, and the fan is characterized by further comprising odd blades which are unevenly distributed at intervals around the center of the impeller, and the blades are uniform in size.
  2. 2. The fan according to claim 1, wherein the number of the blades is 17, and the blades are sequentially arranged at specific angles clockwise and anticlockwise around the start point of the pitch angle of the center of the impeller, and the start point and the end point of the pitch angle are 25.13 degrees.
  3. 3. The fan of claim 1, wherein the impeller has a diameter of 80-100mm and the blades have a diameter of 76-96mm around the center of the impeller.
  4. 4. The fan of claim 1, wherein the blades have an arc length of 32-36mm.
  5. 5. The fan of any of claims 2 to 4, wherein the interval angle starting point to the interval angle ending point are modulated with a cosine frequency, and wherein the cosine frequency is expressed as Φi '=Φi+Φi β cos (mx), where Φi is an original pitch angle (number of blades/360 °) of uniformly spaced blades, Φi' is a new pitch angle of the ith blade after the non-uniform pitch arrangement modification, β is a maximum percentage of a change in pitch angle, n is a number of repetitions of a pitch angle of the blade to be used, and 0+.x+.2pi.
  6. 6. The fan as claimed in claim 5, wherein the blades are spaced apart from each other around the center of the impeller by an angle of ：25.13°、23.06°、20.02°、17.58°、17.01°、18.62°、21.57°、18.62°、21.57°、24.31°、25.41°、24.30°、21.57°、18.62°、21.57°、18.62°、17.01°、17.58°、20.02°、23.06°、25.13°.
  7. 7. The fan of claim 1, further comprising a fan top cover and a fan bottom cover, wherein the fan top cover, the impeller, the motor, the PCB board and the fan bottom cover are arranged in sequence to form the fan.
  8. 8. The fan of claim 7, wherein the motor comprises a magnetic frame, a stator, a shaft core, a bearing and an enameled wire, the magnetic frame, the stator, the shaft core and the bearing are fixed in the fan through a clamp spring, the shaft core penetrates through a PCB (printed circuit board) and is electrically connected with the PCB through the enameled wire, a power interface is arranged on the bottom shell of the fan, an external power supply supplies power for the PCB and the motor, a tag is arranged at the bottom of the bottom shell of the fan, and the tag is adhered to the bottom of the bottom shell of the fan.
  9. 9. A fan according to claim 3, wherein the impeller has a diameter of 96mm and the blades have a diameter of 92mm around the center of the impeller.
  10. 10. The fan of claim 4, wherein the blade has an arc length of 35.37mm.

Description

Fan for ventilation of automobile seat Technical Field The invention belongs to the technical field of fan noise reduction, and particularly relates to a fan for ventilation of an automobile seat. Background The small axial fan is convenient to use and low in cost, and is widely used for civil and commercial heat dissipation and ventilation. In recent years, due to the rapid development of the computer industry and the improvement of the living standard of people, a small axial fan with high performance and low noise is the first choice for heat dissipation, the noise of the fan can be divided into discrete noise and broadband noise from the noise frequency perspective, the noise control generally takes one aspect of reducing the noise source, the other aspect of reducing the noise by using a muffler or a sound insulator from the noise propagation path, and the third aspect of protecting the noise from a noise receiver. The aerodynamic noise generated by the fan blade is far greater than the mechanical noise and electromagnetic noise of the fan, if the fan air inlet and outlet and the blade structure can be improved, the noise radiated by the fan can be greatly reduced, and the method for reducing the noise by the blade has great research and application prospects. Therefore, some methods for processing the blades are presented, and the common methods are that blade perforation reduces vortex noise of a fan, forward-swept blades are adopted to reduce noise, flat blade suction surface cutting is adopted to reduce noise, soft edge discharge is adopted to reduce noise in a small flow area, and the like, wherein the blades which are not uniformly distributed at equal intervals are adopted as a noise reduction measure. The blades of the traditional small axial fan are uniformly distributed, the peak value of discrete noise generated by the fan in the form of the uniform distribution is large, and the noise value of the fan can be effectively reduced by changing the distribution form of the blades and adopting unequal-pitch non-uniform distribution: a fan for ventilation of a car seat has been proposed to solve the above problems. Disclosure of Invention In order to solve the problems in the prior art, the invention provides a fan for ventilation of an automobile seat, which solves the problems in the prior art. In order to achieve the purpose, the invention provides the technical scheme that the fan for ventilation of the automobile seat comprises a motor, wherein the motor drives an impeller to rotate, and the fan further comprises odd blades which are unevenly distributed at intervals around the center of the impeller, and the sizes of the blades are consistent. Preferably, the blades are 17 blades, and the specific angles are sequentially arranged clockwise and anticlockwise around the interval angle starting point of the center of the impeller, and the interval angle is 25.13 degrees as the starting point and the end point. Preferably, the diameter of the impeller is 80-100mm, and the diameter of the blade around the center of the impeller is 76-96mm. Preferably, the arc length of the blade is 32-36mm. Preferably, the interval angle starting point to the interval angle end point are modulated by cosine frequency, and the cosine frequency is modulated by a formula of phi i '=phi i+phi i beta cos (mx), wherein phi i is the original pitch angle (number of blades/360 DEG) of the uniformly spaced blades, phi i' is the new pitch angle of the i th blade after the non-uniform pitch arrangement modification, beta is the maximum percentage of the change of the pitch angle, n is the number of repetitions of the pitch angle of the blades to be used, and 0 +.x +.2pi. Preferably, the blades are spaced apart around the center of the impeller by an angle of ：25.13°、23.06°、20.02°、17.58°、17.01°、18.62°、21.57°、18.62°、21.57°、24.31°、25.41°、24.30°、21.57°、18.62°、21.57°、18.62°、17.01°、17.58°、20.02°、23.06°、25.13°. Preferably, the fan comprises a fan upper cover and a fan bottom shell, wherein the fan upper cover, the impeller, the motor, the PCB and the fan bottom shell are sequentially arranged to form the fan. The motor comprises a magnetic frame, a stator, a shaft core, a bearing and an enameled wire, wherein the magnetic frame, the stator, the shaft core, the bearing and the enameled wire are fixed in the fan through a clamp spring, the shaft core penetrates through a PCB and is connected with the bearing, the motor is electrically connected with the PCB through the enameled wire, a power interface is arranged on a bottom shell of the fan, an external power supply supplies power for the PCB and the motor, a tag is arranged at the bottom of the bottom shell of the fan, and the tag is adhered to the bottom of the bottom shell of the fan. Preferably, the diameter of the impeller is 96mm, and the diameter of the blades around the center of the impeller is 92mm. Preferably, the arc length of the blade is 35.37mm. Compared with the prio