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:
Jul. 26, 1983
Filed:
Mar. 03, 1980
Donald M Cunningham, Pittsburgh, PA (US);
Emerson Electric Co., St. Louis, MO (US);
Abstract
A circulation heater for heating a fluid, particularly a liquid such as oil, includes an imperforate heavy-duty steel tubular body closed at both ends and having internal vanes establishing a plurality of separated longitudinally - extending chambers therein. The vanes are ported to establish a fluid flow path serially through the chambers from an inlet communicating with a first chamber to an outlet communicating with a last chamber. One or more metal-sheathed electric heating elements are located within each chamber and the chambers and heating elements therein are so arranged and designed, for example, by making the chambers of uniform transverse cross-sectional area and placing different numbers of heating elements of identical transverse cross-sectional area in each chamber, that the velocity of the fluid increases as it flows from the inlet to the outlet. The watt density of the heating elements in the respective chambers is correlated to the velocity of the fluid flowing through the chamber and temperature of the fluid in the chamber to prevent overheating of the fluid.