Electric blower having improved return passage for discharged ai

Details Electric blower having improved return passage for discharged ai Electric blower having improved return passage for discharged ai

1990-02-26

1992-05-05

Bertsch, Richard A.

Pumps

With muffler acting on pump fluid

4174232, 41742314, 4174241, 4174242, 417312, 417366, F04B 2100, F04B 1700, F04B 3504

Patent

active

051102668

ABSTRACT:
An electric blower has an electric motor, a centrifugal impeller rotating by the driving of the electric motor, an end bracket for separating the electric motor from the centrifugal impeller, and a diffuser. The diffuser includes a plurality of diffuser vanes arranged near the outer periphery of the centrifugal impeller, and a flat plate portion which extends between the centrifugal impeller and the end bracket for supporting the diffuser vanes. The flat plate portion has a plurality of guide vanes formed on an opposite surface thereof from the diffuser vanes. A passage is defined by the end bracket, the flat plate portion and the guide vanes so as to return the air flow, discharged from the centrifugal impeller through the diffuser vanes, inwardly of the blower. The end bracket is formed in a substantially convex shape so as to extend away from the flat plate portion of the diffuser, with the end bracket extending from a central portion toward its periphery, thereby defining an opening area of the discharge air flow return passage. A sound absorbing material is arranged in the discharge air flow return passage to absorb sounds from the discharging air flow.

REFERENCES:
patent: 4767285 (1988-09-01), Jyoraku

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