Impeller of centrifugal fan

a centrifugal fan and impeller technology, applied in the direction of machines/engines, stators, liquid fuel engines, etc., can solve the problems of undesirable increase of noise level at the high hydrostatic pressure region, and the conventional examination was rather too much partiality

Inactive Publication Date: 2005-12-22
JAPAN SERVO CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0009] An object of the present invention is to provide an impeller of a centrifugal fan having a casing and a multi-blade impeller rotatably supported by a blade holding base in the casing, wherein when the impeller is rotated air is sucked from an air suction port formed on one side wall of the casing, and a centrifugal f

Problems solved by technology

However, the conventional examination was rather too much have a partiality for improvement of the light load-low hydrostatic pressure region in the fan.
The

Method used

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  • Impeller of centrifugal fan
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  • Impeller of centrifugal fan

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Embodiment Construction

[0016] An embodiment of the present invention will now be explained with reference to FIG. 1. Parts of the fan which are similar to corresponding parts of the conventional fan shown in FIG. 3 have been given corresponding reference numerals and need not be further redescribed.

[0017] In FIG. 1, a reference numeral 2-10 denotes a marginal portion of a large diameter D1 of an inner peripheral surface 2-11 of the blade 2-1 at the air suction port, and 2-12 denotes a marginal portion of a small diameter D2 of the inner peripheral surface 2-11 of the blade 2-1 at the blade holding base.

[0018] According to the present invention, the diameter D1 of the inner peripheral surface 2-11 of the blade 2-1 at the air suction port is made larger than the diameter D2 of the inner peripheral surface 2-11 of the blade 2-1 at the blade holding base, so that the inner peripheral surface 2-11 of the blade 2-1 forms a conical surface, as shown in FIG. 1. The diameter of the inner peripheral surface 2-11 ...

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Abstract

An impeller of a centrifugal fan having a casing and a multi-blade impeller rotatably supported by a blade holding base in the casing, wherein when the impeller is rotated air is sucked from an air suction port formed on one side wall of the casing, and a centrifugal force is applied on the air, so that air of high pressure is taken out through an outlet formed on a portion of an outer peripheral surface of the casing. An inner peripheral surface of the impeller is formed of a conical surface having a large diameter at the suction port and a small diameter at the blade holding base. The small diameter at the blade holding base is in the range of 70 to 90% of the large diameter at the suction port. The diameter of the inner peripheral surface of the impeller is reduced linearly from a portion at the suction side to a portion at the blade holding base side.

Description

CROSS REFERENCE TO A RELATED APPLICATION [0001] This application is a continuation of U.S. patent application Ser. No. 10 / 720,715, filed Nov. 24, 2003 the entirety of which is incorporated by reference herein.BACKGROUND OF THE INVENTION [0002] 1. Field of the Invention [0003] The present invention relates to an impeller of a centrifugal fan, and more particularly to an improvement of an impeller for use in a noiseless centrifugal fan of small diameter. [0004] 2. Description of the Prior Art [0005] As shown in the Japanese Patent Laid-Open No. 13690 / 1999, many centrifugal fans wherein the noise is reduced have been proposed and realized. The conventional examination for reducing the noise in the centrifugal fan has been carried out, as a matter of course, with the sole object of the light load-low hydrostatic pressure region which making an operating sound, and the noise reduction in the entire region has not yet been realized. [0006]FIG. 3 shows a conventional centrifugal fan. In FI...

Claims

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Application Information

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IPC IPC(8): F04D29/30F04D29/28F04D29/66
CPCF05B2260/96F04D29/281
InventorSENBA, MORIO
OwnerJAPAN SERVO CO LTD