Document Type and Number:
Japanese Patent JPS5330863
Kind Code:
B2
Abstract:
In variable fill fluid couplings of the type disclosed herein, a driving impeller and a driven runner are coupled for joint rotation by means of a liquid medium in an active liquid chamber formed by the rotating members. The driving impeller is driven at a constant speed by an electric motor, and the active liquid chamber is both continuously bled and continuously fed at rates that can be changed to vary the level of fill of liquid therein. The percentage of liquid fill in the active liquid chamber determines the degree of slip of the runner relative to the impeller which, in turn, determines the speed of the runner under a given load and hence the speed of the output shaft. Such couplings are particularly useful for driving centrifugal pumps at variable rates to maintain a constant pressure in a line on the discharge side of the pump that is subject to a variable demand. To control the rate of fill in a manner that responds rapidly to changes in demand, charging liquid is fed from a source through an orifice which directs the charging liquid into a flowing stream aligned to enter the mouth of the active liquid chanber. A splitter assembly is pivotally mounted to swing in a plane that extends transversely of the flowing stream between the orifice and the mouth of the chamber in order to deflect a portion of the flowing stream away from the mouth. Control means responsive to pressure at the discharge side of the pump causes the splitter assembly to pivot in order to vary the quantity of liquid entering the mouth of an active liquid chamber.
Application Number:
JP12652074A
Publication Date:
August 30, 1978
Filing Date:
November 01, 1974
Export Citation:
International Classes:
F16D33/10