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Low-noise volute and centrifugal fan

A centrifugal fan and noise worm technology, applied in the direction of mechanical equipment, machines/engines, liquid fuel engines, etc., can solve the problems of unfavorable product upgrades and progress, noise reduction restrictions, etc., to reduce impact and reduce rotational noise , reduce the effect of impulse force

Pending Publication Date: 2019-11-29
ZHEJIANG SCI-TECH UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The noise of high-speed and high-pressure centrifugal fans is dominated by rotating noise, while traditional centrifugal fans generally have a straight volute tongue structure, and a single structure has a large limit on noise reduction, which is not conducive to product upgrades and progress

Method used

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  • Low-noise volute and centrifugal fan
  • Low-noise volute and centrifugal fan
  • Low-noise volute and centrifugal fan

Examples

Experimental program
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Effect test

Embodiment 1

[0024] Embodiment one: if figure 1 , 2 , 3, the present embodiment is a volute 1, including a front cover 11, a rear cover 12, an intermediate enclosure 13 for connecting the front cover 11 and the rear cover 12, and an air outlet located at the intermediate enclosure 13 The volute tongue 14 at the place, the front cover plate 11, the rear cover plate 12 and the middle wall plate 13 encircle the air flow channel 15. The width direction of the volute 1 is the width direction of the volute tongue 14. In this width direction, the volute tongue 14 is equally divided into four sections, and the radius of the volute tongue 14 is from one end of the volute tongue 14 to the other end including the initial position The first cochlear tongue radius r 1 , the second cochlear tongue radius r at the quarter position 2 , the radius r of the third cochlear tongue at the half position 3 , the radius of the three-quarter position is the radius of the fourth cochlear tongue r 4 , and the f...

Embodiment 2

[0028] Embodiment 2: This embodiment is a kind of centrifugal ventilator, volute 1, impeller 2, frame, bearing, shaft and motor, impeller 2 comprises blade, middle disc, hub is arranged on the disc, and one end of shaft is connected with hub, Connect the other end to the motor. Wherein the volute 1 adopts the volute 1 disclosed in the first embodiment.

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Abstract

The invention discloses a low-noise volute. The low-noise volute comprises a front cover plate, a back cover plate, a middle surrounding plate and a volute tongue; the front cover plate, the back cover plate and the middle surrounding plate surround an airflow channel; the width direction of the volute is the width direction of the volute tongue; in the width direction, the volute tongue is equally divided into four sections, and the volute tongue radiuses comprise a first volute tongue radius r1 in an initial position, a second volute tongue radius r2, a third volute tongue radius r3, a fourth volute tongue radius r4 and a fifth volute tongue radius r5 from one end of the volute tongue to the other end; all the volute tongue radiuses are symmetrical with the third volute tongue radius r3as center; r1 is equal to r5; r2 is equal to r4; gaps from the middle positions of arcs of all the volute tongue radiuses to the outer edge of an impeller are correspondingly a first gap t1, a secondgap t2, a third gap t3, a fourth gap t4 and a fifth gap t5; all the gaps are symmetrical with the third gap t3 as center; t1 is equal to t5; t2 is equal to t4; t1 is bigger than t2; and t3 is bigger than t2. The rotating noise of a centrifugal fan is effectively lowered.

Description

technical field [0001] The invention relates to a volute, in particular to a low-noise volute. [0002] The invention relates to a centrifugal fan, in particular to a centrifugal fan with a low-noise volute. Background technique [0003] The principle of blade type fluid machinery: the blade transmits the mechanical energy generated by the prime mover to the gas interacting with it by rotating the blade to increase the pressure. This type of machinery is divided into centrifugal, axial flow and mixed flow. Among them, the multi-blade centrifugal fan is widely used because of its outstanding advantages such as large flow coefficient, high pressure coefficient, small size coefficient and low noise. [0004] Noise is a kind of pollution, which will affect people's daily life and work, and reduce labor productivity. The noise of a centrifugal fan under normal operating conditions is a dipole source, which is mainly composed of rotating noise and eddy current noise. The mecha...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F04D29/42F04D29/66F04D29/68
CPCF04D29/4226F04D29/422F04D29/667F04D29/681
Inventor 魏义坤王佳君叶信学何海江曹文斌朱祖超
Owner ZHEJIANG SCI-TECH UNIV
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