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A backward centrifugal fan

A technology of centrifugal fans and discs, which is applied in the direction of mechanical equipment, machines/engines, liquid fuel engines, etc., and can solve problems such as loud noise and high noise

Active Publication Date: 2019-05-24
FANS TECH ELECTRIC CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For backward centrifugal fans, efficiency and noise are often mutually exclusive, and high efficiency often brings higher noise
[0003] In the backward centrifugal fan of the prior art, the orthographic projection of the trailing edge of the blade on the vertical plane passing through the rotation axis is a straight line. When the gas enters the blade through the top cover assembly, a large vortex is formed at the trailing edge of the blade and the noise is large.

Method used

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  • A backward centrifugal fan
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Embodiment Construction

[0035] An embodiment of the present invention provides a backward centrifugal fan, which is used to reduce noise and improve fan efficiency.

[0036] The following will clearly and completely describe the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only some, not all, embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0037] Such as figure 1 As shown, the backward centrifugal fan includes a bottom disc 3, a top cover disc 1, and a blade 2 between the bottom disc 3 and the top cover disc 1. The blade 2 includes a blade root fixed on the bottom disc 3, The end of the blade corresponding to the root of the blade and fixed on the top co...

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Abstract

The embodiment of the invention provides a backward centrifugal fan which is used for lowering noise and improving the draught fan efficiency. According to the technical scheme of the backward centrifugal fan of the embodiment, the backward centrifugal fan comprises a bottom disc part, a top cover disc part and a blade located between the bottom disc part and the top cover disc part. The backward centrifugal fan is characterized in that the rear edge of the blade is sequentially composed of a first plane section, a curved face section and a second plane section; the projection of the first plane section on a specific vertical face is a first straight line section, the projection of the curved face section on the specific vertical face is a curved line section, and the projection of the second plane section on the specific vertical face is a second straight line section; and the sum of the heights of the first straight line section and the second straight line section is 5%-20% of the sum of the overall heights of the first straight line section, the curved line section and the second straight line section.

Description

technical field [0001] The embodiment of the present invention relates to the field of fan technology, and in particular to a backward centrifugal fan. Background technique [0002] The centrifugal fan is used to convert the axial incoming airflow into a circumferential airflow, and the impeller of the centrifugal fan is an important part of the centrifugal fan. In the prior art, backward centrifugal fans are widely used in fields requiring high acoustic quality. With the continuous improvement of aerodynamics, the development of impellers of various fans is adopting more novel designs to obtain higher efficiency, lower noise, and higher acoustic quality. For backward centrifugal fans, efficiency and noise are often mutually exclusive, and high efficiency often brings higher noise. [0003] In the backward centrifugal fan of the prior art, the orthographic projection of the trailing edge of the blade on the vertical plane passing through the rotation axis is a straight lin...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/30
CPCF04D29/30F05D2240/304
Inventor 易榕
Owner FANS TECH ELECTRIC CO LTD
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