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Low-noise forward multi-wing centrifugal blower

A centrifugal fan and multi-blade technology, applied in the direction of mechanical equipment, non-variable pumps, machines/engines, etc., can solve the problems that the noise index cannot meet the needs of fan development, and the noise control methods are limited, so as to achieve sound absorption Good sound insulation effect, good airflow performance and compact structure

Active Publication Date: 2012-04-25
CHINA SHIP DEV & DESIGN CENT +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, due to the limitations of its structural form and processing technology, most of this type of fans in the past used riveted combined impellers and steel plate welded volutes, and their noise control methods were limited, and the noise index could no longer meet the needs of fan development.

Method used

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  • Low-noise forward multi-wing centrifugal blower
  • Low-noise forward multi-wing centrifugal blower
  • Low-noise forward multi-wing centrifugal blower

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Embodiment Construction

[0024] The present invention will be further described below in conjunction with drawings and embodiments.

[0025] It includes a volute 13, an impeller 12 installed in the volute, a current collector 11 installed in the air inlet of the volute, and a motor 15 that drives the impeller to rotate. The rotating shaft of the motor penetrates into the volute and connects with the impeller 12. The front plate of the impeller faces the outer base plate inward, and is fastened by the impeller gland 14. The current collector 11 is connected to the end surface of the other side of the volute. couplet. The overall length L1 of the fan is 290mm, the height h is 335mm, and the width 1 is 300mm. Air enters through the air inlet of the collector 11 and is discharged from the square air outlet of the volute 9.

[0026] The impeller is a forward multi-blade narrow cavity impeller with a structure such as Figure 5 , 6 As shown, it includes a base plate 4 and a hollow front plate 2. The out...

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Abstract

The invention relates to a high-head small-flow forward multi-wing centrifugal blower, which is formed by integrally casting and has a low-noise characteristic. The forward multi-wing centrifugal blower comprises a scroll casing, an impeller and a current collector, wherein the impeller is arranged in the scroll casing; and the current collector is arranged at the air inlet of the scroll casing. The forward multi-wing centrifugal blower is characterized in that: the impeller and the scroll casing are cast integrally; the impeller is a forward multi-wing narrow-cavity impeller; and the scroll casing is an indent narrow-cavity scroll casing. The forward multi-wing centrifugal blower has the advantages of high aerodynamic performance, low noise, light weight and high structural strength; and a gap between the impeller and the scroll casing is reduced by adopting a narrow-cavity indent structure, and vortex caused by backflow between the impeller and the scroll casing can be effectively reduced, so that the airflow vortex noise in a cavity is lowered. Compared with a large quantity of low-noise centrifugal ventilation fans with the same air performance, the low-noise forward multi-wing centrifugal blower has the advantages that: he total pressure efficiency is increased by 7 percent, the air noise is lowered by over 5 dB(A), and the vibration acceleration level elastic installation condition of a fan chassis can be less than or equal to 115 dB, which is far less than those of products of the same type.

Description

technical field [0001] The invention relates to a forward multi-blade centrifugal fan with high-pressure head and small flow rate, which is integrally cast and formed, and has low-noise characteristics. Background technique [0002] Centrifugal fans are widely used in various fields of industrial production. On the premise of ensuring the reliability of operation, the existing centrifugal fans are developing towards low-noise, high-efficiency, and energy-saving multi-blade centrifugal fans. Among them, the low noise of fans has been paid more and more attention, especially in the shipbuilding industry, the noise and vibration indicators of fans are becoming more and more strict. The impeller, volute and collector are the three key components of the centrifugal fan. The structure and processing technology of the three directly affect the performance and noise indicators of the fan. [0003] Forward multi-blade high-pressure head and low-flow centrifugal fans are widely used ...

Claims

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Application Information

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IPC IPC(8): F04D29/66F04D29/28F04D29/42F04D29/44
Inventor 李志印谢永攀郑浩张军军彭光明彭文波张京伟余黎
Owner CHINA SHIP DEV & DESIGN CENT
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