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Centrifugal blades, fan systems and air conditioning units

A centrifugal fan and blade technology, which is applied to the components of pumping devices for elastic fluids, mechanical equipment, machines/engines, etc. , to solve the effect of excessive noise

Active Publication Date: 2019-01-25
GREE ELECTRIC APPLIANCES INC
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] In the embodiment of the present invention, a centrifugal fan blade, fan system and air conditioning device are provided to solve the problem of unsatisfactory blade noise reduction effect and high noise in the prior art

Method used

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  • Centrifugal blades, fan systems and air conditioning units
  • Centrifugal blades, fan systems and air conditioning units
  • Centrifugal blades, fan systems and air conditioning units

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Embodiment Construction

[0025] The present invention will be described in further detail below in conjunction with the accompanying drawings and specific embodiments, but not as a limitation of the present invention.

[0026] The inventor carried out aerodynamic simulation calculations on the fan blades, and found that the structure at the leading edge of the blade is pointed, and it is easy to generate large broadband noise after being impacted by high-speed airflow, that is, the maximum value of broadband noise is at the leading edge. Therefore, The invention improves the design of the leading edge of the blade to reduce noise.

[0027] Please refer to Figure 1 to Figure 5 , the centrifugal fan blade in the present invention includes a blade 1 , a front disc 10 and a rear disc 11 . Wherein, one side of blade 1 is connected with front disk 10, and the projection of front disk 10 on its meridian plane is arc-shaped; the other side of blade 1 is connected with rear disk 11, that is, blade 1 is locat...

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Abstract

The invention discloses a centrifugal fan blade, a fan system and an air conditioning device. The centrifugal fan blade comprises a blade body, wherein the blade body comprises a leading edge, a pressure surface and a suction surface, the projection of the transition curve of the leading edge on a meridian plane of the blade is a first projection curve, the projection of the pressure surface on the meridian plane is a second projection curve, and the projection of the suction surface on the meridian plane is a third projection curve. The included angle formed by the tangent line at the intersection point of the first projection curve and the lower side boundary of the blade and the lower side boundary is 80-90 degrees, the first projection curve is tangent with the upper side boundary of the blade, and the second projection curve is located on the outer side of the third projection curve. The maximum value of broadband noise can be reduced, and the problem that the blade is too large in noise in work is solved.

Description

technical field [0001] The invention relates to the technical field of air conditioning, in particular to a centrifugal fan blade, a fan system and an air conditioning device. Background technique [0002] When the centrifugal blades are running, the gas will collide with each other during the flow process, and the gas and objects will also collide, resulting in aerodynamic noise, which affects people's daily work and study. [0003] In order to reduce aerodynamic noise, the existing technology mainly reduces noise through the following methods: setting the ratio of the air outlet area to the air inlet area at 1.2-1.5; The sound pressure generated by the side blades is not in the same frequency range, reducing the sound pressure superposition, thereby reducing the noise value; the volute tongue structure is used to cooperate with the fan blades to reduce noise. However, the noise reduction effects of these methods are not ideal, and the noise is still relatively large. Co...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/30
CPCF04D29/30
Inventor 李建建赵万东
Owner GREE ELECTRIC APPLIANCES INC
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