Patent ID: 6330799
Filing Date: 2001-12-18
Classification: F16D

Abstract:
An adaptive cooling system control system for controlling fluid delivery from a pump to a fan motor comprising:an inlet for receiving fluid from a pump;an outlet for delivering fluid to a fan motor;a return passage from an outlet of the fan motor;primary means for controlling the speed of a fan, the primary controlling means comprising a bypass valve including a first passage in fluid communication with the inlet and the outlet, and a bypass passage selectively communicable with the inlet, the bypass passage being placed in fluid communication with the inlet upon receiving fluid from a pump in excess of a predetermined desired quantity of such fluid; andmeans for minimizing cavitation of a fan after fluid delivery from a pump ceases, the cavitation minimizing means comprising means for circulating fluid from the return passage into the inlet until the pressure in the return passage falls below a predetermined pressure, the circulating means comprises:a first check valve having a first rating, an open position and a closed position, the first check valve associated with the return passage and providing a fluid conduit from the return passage to a fluid outlet when in the open position; anda second check valve having a second rating, an open position and a closed position, the second check valve being associated with the return passage, wherein the second check valve provides a fluid conduit between the return passage and the inlet when in the open position,the second rating being a pressure higher than the first rating;whereupon cessation of fluid delivery from a pump, and decrease in flow of fluid in the inlet, the second check valve returns to the closed position, and the first check valve is prompted into the open position, to, in turn, facilitate circulation of fluid from the return passage through the first check valve into the inlet until the pressure within the return passage falls below a predetermined pressure.