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:
Apr. 29, 1997
Filed:
Jan. 02, 1996
Sung-Dai Moon, Kyeongsangbook-Do, KR;
Daewoo Electronics Co., Ltd., Seoul, KR;
Abstract
The present invention relates 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 an improved structure of an impeller body and a motor shaft so that a substance such as mud is prevented from being accumulated in a motor while the motor is sufficiently cooled. The circulating pump comprises a motor, an impeller and a pump housing. At the outer surface of motor shaft a spiral groove is formed and at the center of motor shaft a cooling water discharging passage is formed along the axis of the motor shaft. At a lower portion of an impeller body a curved projecting portion forming a cooling water inflow chamber by joining together with motor shaft is provided and a plurality of cooling water outlet holes are formed therein. At an upper end of cooling water discharging passage a ball seat with a ball therein is provided. Fluid pressurized into in the inpeller chamber by the impeller returns into the impeller through a spiral groove and cooling water discharging passage of the motor shaft under the action of pressure difference of fluid between the impeller chamber and the impeller and rotation of the spiral groove.