초록 ▼

In an oil conditioner comprising: a coolant oil circulation circuit ( 8 ) through which a coolant oil of a machine tool ( 1 ) is circulated by an oil pump ( 12 ); a refrigeration circuit ( 20 ) formed by interconnecting, in the order given, a compressor ( 15 ), a condenser ( 16 ), a pressure reducin

In an oil conditioner comprising: a coolant oil circulation circuit ( 8 ) through which a coolant oil of a machine tool ( 1 ) is circulated by an oil pump ( 12 ); a refrigeration circuit ( 20 ) formed by interconnecting, in the order given, a compressor ( 15 ), a condenser ( 16 ), a pressure reducing mechanism ( 17 ), and an evaporator ( 18 ) for cooling the coolant oil in the coolant oil circulation circuit ( 8 ) by heat exchange with refrigerant; and an inverter ( 28 ) for controlling the operating frequency of a motor ( 14 ) of the compressor ( 15 ), the output from the inverter ( 28 ) is switched to a motor ( 11 ) of the oil pump ( 12 ) during the time the compressor ( 15 ) is out of operation so that the amount of coolant oil that the oil pump ( 12 ) circulates is made variable, and the amount of coolant oil that the oil pump ( 12 ) circulates is reduced when the amount of heat produced in the operation of the machine tool ( 1 ) decreases because, for example, the machine tool ( 1 ) is stopped, for reducing wasteful consumption of energy by the oil pump ( 12 ). Energy savings are achieved through the oil pump ( 12 ).

대표청구항 ▼

1. 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

1. 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 , 28 P) which changes the operating frequency of said motor ( 11 ) of said circulation pump ( 12 ), an the operating frequency of said motor of said compressor; andswitching 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 , 28 P). 2. The temperature controller for said liquid cooling system of claim 1,wherein:said coolant liquid circulation amount control means ( 27 ) has, as the operating mode of said circulation pump ( 12 ), a rated flow rate mode in which the rate of flow of said coolant liquid is fixed and a variable flow rate mode in which the rate of flow of said coolant liquid varies, and is so configured as to allow said circulation pump ( 12 ) to switch between said flow rate modes according to an operating state or operating environmental state of said machine ( 1 ). 3. The temperature controller for said liquid cooling system of any one of claims 1 and 2 ,wherein said operating state or operating environmental state of said machine ( 1 ) includes at least one of a signal sent from the side of said machine ( 1 ), a liquid temperature of said coolant liquid, an operating temperature of said machine ( 1 ), and an environmental temperature of said machine ( 1 ). 4. The temperature controller of any one of claims 1 and 2 ,wherein said machine ( 1 ) is a machine tool or industrial machine using oil as a coolant liquid.