centrifugal fan
A centrifugal fan and impeller technology, which is applied to mechanical equipment, non-variable-capacity pumps, machines/engines, etc., can solve the problems of difficulty in suppressing the noise of a single unit, and the noise of a single centrifugal fan increases, and achieves the goal of suppressing the single unit noise. Noise, the effect of realizing single noise
Active Publication Date: 2018-07-31
RINNAI CORP
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Problems solved by technology
[0008] However, if the diameter of the bell mouth of the centrifugal fan is reduced, the noise of the single centrifugal fan tends to increase, 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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Embodiment Construction
[0032] 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.
[0033] 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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The present invention is to provide a centrifugal fan which can suppress noise of a single body, and sonorant of the entire device including the centrifugal fan. A cylindrical impeller in which a plurality of projecting parts stand in an external part of a rotating disk is accommodated in a scroll casing, fills one end surface of the scroll casing, and fills the other end surface by a cover plate in which a first bell mouth is installed. Also, a second bell mouth surrounding the first bell mouth is formed on surfaces of the impeller side of the cover plate. A front end of the second bell mouth is inserted toward the lower plate side than a front end of the cover plate side of the projecting parts inside the impeller. Air flow which flows backward from the outside to the inside of the impeller curves a gap between an end of the cover plate side of the projecting part and the cover plate toward the inside (substrate side) of the impeller by a main wall of the second bell mouth. Accordingly, influence of a back flow which causes noise of the single body becomes smaller so that sonorant and noise of the single body can be suppressed by making an opened surface of the first bell mouth smaller.
Description
technical field [0001] The present invention relates to a centrifugal blower for blowing air into a combustion device and the like. Background technique [0002] A centrifugal fan is known as a blower used in a combustion apparatus 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 cover plate that covers one end side of the volute in the axial direction of the rotating shaft is formed with an opening facing the impeller. Bell mouth for directing air on the inside. 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 impe...
Claims
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IPC IPC(8): F04D29/44F04D29/66
CPCF04D29/4226F04D29/663F04D29/422F04D29/4233F04D29/44F04D29/665F04D29/667F04D29/668
Inventor 赤木万之宫岛征树岩田一贵
Owner RINNAI CORP