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:
Nov. 03, 1981
Filed:
Jan. 25, 1980
Per Hohne, Valby, DK;
Alfa-Laval Separation A/S, Soborg, DK;
Abstract
A system for controlling the relative rpm. of the conveyor screw of a decanter centrifuge includes a gear interconnecting the screw and the centrifuge drum. The gear has an input shaft the rpm. of which determines the relative rpm. of the screw, and a housing rotating in synchronism with the drum. The input shaft and the housing are coupled to one each of two rotary, positive displacement machines one of which is a constant displacement machine while the other is a variable displacement machine. The machines are hydraulically connected in series in a closed circuit so that a change in the displacement volume of the variable machine, at constant rpm. of the gear housing, results in a change in the rpm. of the input shaft. The variable displacement machine may be mechanically coupled to a further constant displacement machine whereby the flow rate through the variable displacement machine is reduced to the difference between the flow rates through the other two machines.