Patent ID: 6779354
Filing Date: 2004-08-24
Classification: B23Q,F04B,F25B,F25D

Abstract:
A temperature controller for a liquid cooling system, said liquid cooling system comprising:a coolant liquid circulation circuit (8) in which a coolant liquid of a machine (1) is circulated by a circulation pump (12) which is operated by a motor (11), a refrigeration circuit (20) formed by interconnecting, in the order given, a compressor (15), operated by a motor (14), for compressing gas refrigerant, a condenser (16) for condensing gas refrigerant, a pressure reducing mechanism (17) for depressurizing liquid refrigerant, and an evaporator (18) for cooling said coolant liquid in said coolant liquid circulation circuit (8) by heat exchange with refrigerant, an inverter (28, 28P) which changes the operating frequency of said motor (11) of said circulation pump (12), an the operating frequency of said motor of said compressor; and switching means (33) which switches, according to an operating state or operating environmental state of said machine (1), the destination, to which an output from said inverter (28) is directed, between said motor (14) of said compressor (15) and said motor (11) of said circulation pump (12); wherein coolant liquid circulation amount control means (27) is provided which varies, on the basis of an operating state or operating environmental state of said machine (1), the amount of coolant liquid that said circulation pump (12) circulates and said coolant liquid circulation amount control means (27) varies the rate of flow by controlling the operating frequency of said motor (11) of said circulation pump through said inverter (28, 28P).