Impeller with staggered leaf on front edge

A blade leading edge and blade technology, which is applied to parts of pumping devices for elastic fluids, non-variable pumps, machines/engines, etc., can solve the complexity of working equipment or systems, increase additional expenses, and increase total investment and other issues, to achieve obvious social and economic benefits, low cost, and reduce noise

Inactive Publication Date: 2006-08-16
SHANGHAI JIAO TONG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
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AI Technical Summary

Problems solved by technology

However, to make the sound waves produced by the sound wave generator and the noise of the fan have the same amplitude, this problem is generally not solved well and has certain difficulties; The frequency and amplitude (sound pressure) of the noise are changed synchronously, which is more difficult to achieve
[0006] 2. The "acoustic wave interference method" must add an acoustic wave generator, which often makes the working equipment or system of the fan complex and large, and increases additional expenditure and increases the total investment.

Method used

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  • Impeller with staggered leaf on front edge
  • Impeller with staggered leaf on front edge

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Embodiment Construction

[0017] The specific implementation of the present invention will be further described below in conjunction with the accompanying drawings.

[0018] The number of blades of the impeller designed by the present invention is an even number, and the blades of the impeller are divided into two rows—odd row blades and even row blades, and the blades are installed on the hub of the axial flow fan at equal intervals along the circumference, or on the wheel disk of the centrifugal fan , where the leading edges of the odd-numbered and even-numbered blades are staggered, that is, the leading edges of the odd-numbered blades and the even-numbered blades are staggered back and forth, and the distance between the leading edges of the two rows of blades satisfies the two The condition in which the phases of sound waves are opposite or differ by half a wavelength.

[0019] figure 1 It is a schematic diagram of the structure of the axial flow fan impeller adopting the displacement of the lead...

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PUM

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Abstract

The invention relates to a blade front edge misplaced impeller. First, suppose the number of the blades of the fan impeller to be even, and then mount the blades equidistantly around the circumference on the hub of the axial-flow fan or on the wheel disk of the centrifugal fan. The front edges of odd and even series blades are misplaced. If the distance between the front edge of the two series blades satisfies the condition of making the phase of two sound waves reverse or differ by half a wavelength, two sound waves with the same frequency and amplitude and reversal phases are constructed.

Description

technical field [0001] The invention relates to an impeller with staggered front edges of blades, which is especially suitable for various types of fans and has good noise reduction effect. It belongs to the technical field of fluid machinery. Background technique [0002] The fan is a general-purpose machine with a wide range of applications. Because it makes a lot of noise when it works, it will affect people's work and living environment. Therefore, reducing the noise of the fan is the desire of the user, the design and the pursuit of the manufacturer. The goal. Usually, there are two ways to reduce fan noise: active and passive noise reduction. Active noise reduction is to take measures to improve the flow of air in the fan, reduce the pulsation of air flow, and the impact of solid walls; passive noise reduction is to adopt Muffler or shock absorber and other methods to achieve. When active noise reduction cannot meet the requirements of use, passive noise reduction i...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/38
Inventor 顾建明顾茜姣
Owner SHANGHAI JIAO TONG UNIV
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