Single pump cooling arrangment

Abstract

A cooling arrangement having a first circuit and a second circuit in fluid communication of a coolant with each other. The cooling arrangement includes a pump configured to receive the coolant from the first circuit and the second circuit, and to re-circulate the coolant back to the first circuit and the second circuit. Further, the cooling arrangement includes an after-cooler disposed in the first circuit. A thermostat is provided in connection with the after-cooler to regulate a flow of the coolant supplied to the pump based on the temperature of the coolant from the after-cooler. Further, a bypass line is disposed in parallel to the thermostat in the first circuit. The bypass line is configured to provide a constant bleed of the coolant from the first circuit to the pump.

What is claimed is: 
     
         1 . A cooling arrangement comprising:
 a first circuit;   a second circuit configured to be in fluid communication with the first circuit;   a coolant for circulating in the first circuit and the second circuit;   a pump configured to receive the coolant from the first circuit and the second circuit, the pump further configured to circulate the coolant back to the first circuit and the second circuit;   an after-cooler disposed in the first circuit of the cooling arrangement;   a thermostat disposed in connection with the after-cooler in the first circuit, the thermostat is configured to regulate the flow of the coolant from the after-cooler to the pump based on the temperature of the coolant from the after-cooler; and   a bypass line disposed in the first circuit parallel to the thermostat, the bypass line is configured to provide a constant bleed of the coolant in the cooling arrangement.   
     
     
         2 . The cooling arrangement of  claim 1 , wherein the first circuit further includes a first auxiliary thermostat configured to regulate the flow of the coolant from the pump to the first circuit. 
     
     
         3 . The cooling arrangement of  claim 1 , wherein the second circuit further includes a second auxiliary thermostat configured to regulate the flow of coolant from the second circuit to the pump. 
     
     
         4 . The cooling arrangement of  claim 1 , wherein the first circuit is a low temperature circuit further including an after-cooler heat exchanger in connection with the after-cooler, the after-cooler heat exchanger configured to cool the coolant supplied to the after-cooler from the pump. 
     
     
         5 . The cooling arrangement of  claim 1 , wherein the second circuit is a high temperature circuit in connection with an engine, the second circuit further includes a heat exchanger configured to cool the coolant supplied to the pump from the engine. 
     
     
         6 . The cooling arrangement of  claim 5 , wherein the second circuit further includes a turbocharger configured to provide a charge air to the engine via the after-cooler. 
     
     
         7 . The cooling arrangement of  claim 1 , wherein the bypass line further includes an orifice disposed within, the orifice is configured to control the flow of the coolant through the bypass line based on the diameter of the orifice. 
     
     
         8 . The cooling arrangement of  claim 7 , wherein the orifice has the diameter of approximately 2-12 millimeters. 
     
     
         9 . The cooling arrangement of  claim 7 , wherein the orifice has the diameter of approximately 5 millimeters. 
     
     
         10 . A marine power system comprising:
 an engine; and   a cooling arrangement configured to extract heat from the engine by a coolant, the cooling arrangement including:
 an after-cooler configured to cool a charge air for the engine by the coolant, 
 a pump configured to receive the coolant from the after-cooler and the engine, and re-circulates the coolant back to the after-cooler and the engine, 
 a thermostat disposed in connection with the after-cooler, the thermostat is configured to regulate a flow of the coolant from the after-cooler to the pump based on the temperature of the coolant from the after-cooler, 
 a bypass line disposed in parallel to the thermostat, the bypass line is configured to provide a constant bleed of the coolant in the cooling arrangement, and 
 an orifice disposed in the bypass line to control the flow of the coolant through the bypass line. 
   
     
     
         11 . The marine power system of  claim 10  further includes a turbocharger configured to provide the charge air to the engine via the after-cooler. 
     
     
         12 . The marine power system of  claim 10  further includes a heat exchanger configured to cool the coolant from the engine. 
     
     
         13 . The marine power system of  claim 10  further includes a first auxiliary thermostat configured to regulate the flow of coolant from the pump to the after-cooler. 
     
     
         14 . The marine power system of  claim 10  further includes a second auxiliary thermostat configured to regulate the flow of coolant from the engine to the pump. 
     
     
         15 . The marine power system of  claim 10 , wherein the orifice is configured to control the flow of the coolant through the bypass line based on the diameter of the orifice. 
     
     
         16 . The marine power system of  claim 15 , wherein the orifice has the diameter of approximately 2-12 millimeters. 
     
     
         17 . The marine power system of  claim 15 , wherein the orifice has the diameter of approximately 5 millimeters. 
     
     
         18 . A method for cooling an engine, the method comprising:
 receiving a coolant from the engine to a pump;   pumping the coolant from the pump to an after-cooler;   regulating the flow of the coolant from the after-cooler to the pump, to be supplied back to the engine, by a thermostat; and   providing a bypass line in parallel to the thermostat to provide a constant bleed of the coolant from the after-cooler to the engine.   
     
     
         19 . The method of  claim 18 , wherein regulating the flow of the coolant further includes allowing the coolant to flow through the thermostat based on the temperature of the coolant from the after-cooler. 
     
     
         20 . The method of  claim 18 , wherein providing the bypass line further includes disposing an orifice within the bypass line to control the flow of the coolant through the bypass line.