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Centrifugal fan

A blower, centrifugal technology, applied in the field of centrifugal blower

Active Publication Date: 2011-05-11
PANASONIC CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0010] The present invention is made to solve the above-mentioned existing problems, and it provides a noise-cancelling noise that can expand the frequency range of the noise that can be silenced, can silence lower-frequency noise without changing the size of the outer contour, and can adjust the noise-cancellation. The frequency of the noise of the centrifugal blower

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment approach 1

[0152] Such as Figure 1A , 1B As shown, the centrifugal blower 1 used as a ceiling-embedded ventilation fan has an internal dimension of 265 mm square, a height of 195 mm, and an outer contour 3 with an opening 2 on the lower surface. A motor 6 connected to a 180 mm multi-blade impeller 5; surrounding the impeller 5, a casing 10 having a funnel-shaped suction port 7 with an inner diameter Di of 150 mm on the lower surface and a discharge port 9 on the side wall 8. The side wall 8 of the box body 10 is a spiral shape gradually expanding toward the outlet 9 , and the outlet 9 of the box body 10 communicates with the outlet adapter 12 through the outlet opening 11 provided on one side of the outer contour 3 . An electrical part 13 for accommodating electrical components such as connectors and terminals for electrically connecting the motor 6 and an external power supply is arranged in a part between the case 10 and the outer shell 3 . There is a flange portion 14 on the outer ...

Embodiment approach 2

[0174] Embodiment 2 of the present invention will be described below. The description of the same parts as those in Embodiment 1 of the present invention will be omitted, and only the parts specific to Embodiment 2 will be described.

[0175] In Embodiment 2, such as Figure 5 As shown, the inner diameter D of the cylindrical wall body concentric with the suction port 7 arranged in the resonance space 20 is 160 mm, and the gap dimension i (20 mm) between the inner diameter Di (150 mm) of the suction port 7 and the inlet portion 23 is A relationship of D<Di+2i is formed.

[0176] According to this configuration, the area of ​​the inlet region 24 surrounded by the cylindrical wall 22 and the nozzle 19 can be reduced, which is equivalent to the throat area S of the Helmholtz resonator. In addition, it is possible to increase the volume of the resonance space 20 inside the cylindrical tubular wall body 22 , which corresponds to the volume V of the hollow portion. Therefore, low...

Embodiment approach 3

[0178] Embodiment 3 of the present invention will be described below. The description of the same parts as those in Embodiment 1 of the present invention will be omitted, and only the parts specific to Embodiment 3 will be described.

[0179] In Embodiment 3, such as Image 6 As shown, the cylindrical wall 22 provided in the resonance space 20 concentrically with the suction port 7 has a thickness of 20 mm, and the end 21 of the nozzle 19 is arranged to face the end surface 34 of the wall at a distance of 5 mm. The region sandwiched between the end face 34 of the wall and the end 21 of the nozzle 19 constitutes the inlet region 24 .

[0180] According to this configuration, the radial depth of the inlet region 24 surrounded by the end surface 34 of the cylindrical tubular wall and the end 21 of the nozzle 19 can be made corresponding to the throat length L of the Helmholtz resonator. The length Lr becomes longer. Therefore, lower frequency noise can be silenced by the opera...

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Abstract

A centrifugal fan used for ventilation fan devices etc., in which noise in a wider frequency range can be reduced and the frequency of reducible noise is adjustable. The centrifugal fan has, received in an outer shell, an electric motor to which an impeller is connected, a casing for surrounding the impeller and having a bell mouth-shaped suction opening on one side of the casing, and a bell mouth-shaped orifice having an opening concentric with the suction opening and having a diameter less than or equal to the diameter of the suction opening. A member for closing a gap between an end of theorifice and the casing is formed from a material for noise absorption structure, and a resonance-type sound absorption structure is formed by using a space, formed by the orifice, as a rear air layer.

Description

technical field [0001] The present invention relates to a centrifugal blower used in ventilating and blowing equipment and the like. Background technique [0002] Conventionally, it is known that such a centrifugal blower is used in a centrifugal blower or the like, and that, in addition to a suction box having a funnel-shaped suction port, a nozzle pipe is provided in an opening on one side of the outer contour. An example of such a conventional centrifugal blower is described in Patent Document 1, for example. [0003] Below, refer to Figure 31 Such a conventional centrifugal blower will be described. [0004] Such as Figure 31 As shown, the existing centrifugal blower has: an outer profile 101 with an opening on one side; a motor 104 fixed to the impeller 103 on the top surface 102 in the outer profile 101; a casing 105 surrounding the impeller 103; having a suction port 106 suction box 107. Also, the nozzle pipe 109 having a suction hole 108 equal to or smaller than...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): F04D29/42F04D29/66
Inventor 白滨诚司荻野和郎椿下庸二贞本晃
Owner PANASONIC CORP