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Centrifugal fan

a centrifugal fan and fan body technology, applied in the direction of non-positive displacement fluid engines, pump components, piston pumps, etc., can solve the problems of too large temperature differences and avoid the effect of reducing the temperature difference between armatures and electronic components

Inactive Publication Date: 2007-06-07
NIPPON DENSAN CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0008] According to the present invention, formation of the depression enables efficient s

Problems solved by technology

A rotational speed of a recent centrifugal fan for cooling is on the increase, and since a current of a motor housed inside the centrifugal fan increas

Method used

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Examples

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Effect test

first embodiment

[0023]FIG. 1 is a view showing a configuration of a centrifugal fan 1 according to the present invention. FIG. 1 shows a vertical sectional view obtained by cutting with a plain including a central axis J1. Further, FIG. 2 is an oblique view showing an exploded main configuration of the centrifugal fan 1. As shown in FIG. 1, the centrifugal fan 1 comprises: an impeller portion 2 which is rotated to generate the flow of air; and a motor 3 which is connected to the impeller portion 2 and rotates the impeller portion 2 around the central axis J1. The impeller portion 2 and the motor 3 are housed in a housing 10. As shown in FIGS. 1 and 2, the housing 10 is assembled by fitting a cover portion 12 having an inlet 121 to the housing body 11, and surrounds the impeller portion 2 to form a flow channel for the air (namely, the flow of the air that is generated by the rotation of the impeller portion 2 is adjusted for delivery). The centrifugal fan 1 is used, for example, as an electric fan ...

third embodiment

[0047]FIG. 9 is a vertical sectional view of a centrifugal fan 1a according to the present invention. The centrifugal fan 1a is significantly different from the centrifugal fan 1 in that a plurality of blades 22a radiate from the outside surface of the cup portion 321. Namely, while the centrifugal fan 1 of FIG. 1 is a so-called sirocco fan, the centrifugal fan 1a of FIG. 9 is a so-called turbo fan. Further, in the centrifugal fan 1a, the annular protrusion 1121 of the base portion 112 is provided so as to protrude toward (the edge of) the opening 3211 of the cup portion 321, and the annular protrusion 1121 is provided with the depression 1122 for partially expanding the space between the opening 3211 of the cup portion 321 and the base portion 112. Other structures are the same as those of the centrifugal fan 1 of FIG. 1, and the same numerals are provided.

[0048] In the case of the centrifugal fan 1a shown in FIG. 9, as in the case of FIG. 1, the air is supplied to the armature 315...

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PUM

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Abstract

In a centrifugal fan, an impeller portion, fitted to a rotor portion which rotates with respect to a stator portion, rotates around a central axis J1. The impeller portion is housed in a housing comprised of a housing body and a cover portion. By rotation of the impeller portion, air is taken in from an inlet and delivered from an outlet. In the centrifugal fan, an annular protrusion, protruding toward a connection plate on the lower side of blades, is formed in the base portion in order to make a space between the impeller portion and the base portion small. A depression for partially expanding a space between the connection plate and the base portion is provided in the annular protrusion.

Description

BACKGROUND OF THE INVENTION [0001] 1. Field of the Invention [0002] The present invention relates to a motorized centrifugal fan to be used for air blasting. [0003] 2. Description of Related Art [0004] In a centrifugal fan for taking in air in an axial direction and discharging the air in a radial direction, there has hitherto been provided an impeller having a plurality of blades arranged in a circumferential direction with a rotational axis as the center, and while a cup-shaped portion provided at the midsection of the impeller has a field magnet on its inside surface, a cylindrical metal yoke having magnetism is pressed and fitted to the cup portion, to make the impeller rotatable around the rotational axis. A variety of devices are comprised in the centrifugal fan as thus described in order to reduce noise, improve an air volume characteristic, and suppress performance degradation with the increase in temperature of a motor. [0005] A rotational speed of a recent centrifugal fan ...

Claims

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Application Information

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IPC IPC(8): F04B17/00
CPCF04D25/0613F04D25/082F04D29/4226F04D29/5806
Inventor MORIYA, SHIGEYUKIYAMAZAKI, SHOKI
Owner NIPPON DENSAN CORP