The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Mar. 25, 1997
Filed:
Jan. 02, 1996
Sung-Dai Moon, Kyeongsangbook-Do, KR;
Daewoo Electronics Co., Ltd., Seoul, KR;
Abstract
The present invention is relating to a circulating pump for pressurizing and circulating fluid in a system such as a boiler. An object of the present invention is to provide a circulating pump with a sub-impeller wherein a separate sub-impeller is provided below an impeller for moderating resistance occurring at the impeller due to pressure difference between an impeller chamber and an inside of the impeller during an operation of a pump so that power loss is prevented during a motor driving and a substance such as mud is prevented from entering a stator can. The circulating pump with a sub-impeller comprises a motor, an impeller and a pump housing. Below the impeller body, a sub-impeller with a plurality of radial baldes is provided. The sub-impeller forces out pressurized fluid that has flowed below the impeller back from below the impeller radially while rotating. According to this, pressure difference between an impeller chamber and an inside of the impeller which makes the impeller rise toward a suction ring is reduced. Thus, loss of power consumed for overcoming the pressure difference is also reduced.