PURPOSE: To contrive increase of an flow amount and a pressure and reduction of a noise level by providing a means for reducing a sectional area of an annular groove in a part connected to a suction port or a delivery port in the annular groove provided in a casing for storing an impeller.
CONSTITUTION: When an electric motor 30 is rotated, an impeller 1 is rotated with a rotary shaft 4 serving as the center, and an internal flow is generated in an annular groove 3a of a blower casing 3 and an impeller annular groove 1b by a plurality of blades 1a provided in the impeller annular groove 1b. In this way, in air sucked from a suction port 3b, an internal flow, connected to a delivery port 3e via a partitioning wall 3da side section reducing means 3e in a point end part of a partition part 3d and a partioning wall 3db side section reducing means 3f in an intermediate part 3g of the annular groove 3a and the point end part of the partition part 3d, is formed. As a result, increase of an air amount, high pressure of air, reduction of noise, suppression of pressure drop, etc., can be attained.
YAMAZAKI SUSUMU
ASABUKI HIROSHI
KOBAYASHI KAZUO
FUJIO MASAYUKI
YOSHITOMI TOSHIJI
| JPS4997315A | 1974-09-13 | |||
| JPH01170791A | 1989-07-05 | |||
| JPS5127111A | 1976-03-06 | |||
| JPS4983906A | 1974-08-13 |