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Centrifugal fan

A centrifugal fan and volute technology, applied in mechanical equipment, non-variable-capacity pumps, machines/engines, etc., can solve problems such as difficulty in suppressing single-unit noise and increasing single-unit noise.

Active Publication Date: 2015-04-29
RINNAI CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] However, if the diameter of the opening of the centrifugal fan is reduced, there is a tendency to increase the noise of the centrifugal fan alone, and there is a problem that although the resonance sound can be suppressed, it is difficult to suppress the noise of the single body.

Method used

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Examples

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Embodiment Construction

[0021] figure 1 It is a perspective view showing the disassembled state of the centrifugal fan 10 of this embodiment. The centrifugal fan 10 is connected to, for example, a combustion device (not shown) having a built-in burner, and is used to send combustion air to the burner. As shown, the centrifugal fan 10 includes an impeller 20 that generates wind by rotation, a driving motor 30 for rotating the impeller 20 , a fan housing 50 for accommodating the impeller 20 , and the like.

[0022] The impeller 20 of the present embodiment is a so-called multi-blade blower in which a plurality of blades 24 formed elongately in the axial direction of the rotating shaft 32 of the driving motor 30 are radially arranged with respect to the rotating shaft 32 at predetermined intervals. cylindrical shape. One end (lower end in the drawing) of the blade 24 is attached to the outer edge portion of the substantially circular rotating disc 22 , and the other end (upper end in the drawing) of ...

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Abstract

The invention provides a centrifugal fan which can inhibit the noise of single centrifugal fan and acoustic resonance of a whole device comprising the centrifugal fan at the same time. A plurality of blades are radially arranged relative to a spindle so as to form a cylindrical impeller, and then the impeller is installed in a volute. A first opening part having a bell-shaped opening is arranged on a cover plate that covers the volute in the axial direction of the rotation shaft. A guiding plate having a second opening part with a bell-shaped opening is arranged in the first opening part and a gap is formed between the cover plate and the guiding plate. The gap is communicated with the atmosphere so as to reduce negative pressure formed between the top end of the second opening part and the blades of the propeller. So the reverse air flow, which causes the noise, from the outer side to the inner side of the impeller is reduced. The surface ratio of the gap to the opening part of the second opening part is 3 to 15%. The provided centrifugal fan can inhibit the noise of single centrifugal fan and acoustic resonance of a whole device comprising the centrifugal fan.

Description

technical field [0001] The present invention relates to a centrifugal fan for feeding wind into a combustion device or the like. Background technique [0002] A centrifugal fan is known as a blower applied to a combustion device or the like (for example, Patent Document 1). A centrifugal fan includes a cylindrical impeller in which a plurality of blades are radially arranged with respect to a rotating shaft, and a volute for accommodating the impeller. The volute is formed in a cylindrical shape with a radius that increases in the direction of rotation of the impeller with respect to the rotating shaft of the impeller, and a bell mouth is provided on a cover plate covering one end side of the volute in the axial direction of the rotating shaft. Shaped opening. In addition, an air blowing passage is extended in a tangential direction from the peripheral surface on the side with a larger radius of the volute. When the impeller is rotated, air is blown out from the inner sid...

Claims

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Application Information

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IPC IPC(8): F04D29/44F04D29/28F04D29/66
CPCF04D29/4213F04D29/4226F04D29/663F04D29/42F04D29/422F04D29/44F04D29/66F04D29/665
Inventor 赤木万之宫岛征树泷启东志
Owner RINNAI CORP
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