Constant-temperature liquid circulating apparatus

A constant-temperature liquid circulating apparatus comprising:

• a constant-temperature liquid circuit section configured to cool or heat a constant-temperature liquid returned back from a load to a predetermined temperature to supply the constant-temperature liquid to the load;
• a refrigerating circuit section configured to cool or heat the constant-temperature liquid;
• and
• a control section,
• wherein the refrigerating circuit section includes a main circuit section having a compressor whose revolution speed is controlled by an inverter power source, a condenser, a first electronic expansion valve, an evaporator and piping connecting the compressor, the condenser, the first electronic expansion valve and the evaporator in series, a hot gas circuit section that has a second electronic expansion valve that bypasses the condenser and the first electronic expansion valve to supply a portion of refrigerant with a high temperature discharged from the compressor to the evaporator, and refrigerant temperature sensors or pressure sensors to detect a temperature or a pressure of the refrigerant,
• wherein the constant-temperature liquid circuit section includes a tank containing constant-temperature liquid, a heat exchanger that cools or heats the constant-temperature liquid returned back from the load in the evaporator, a constant-temperature liquid temperature sensor that detects the temperature of a constant-temperature liquid, and circulating means for supplying a constant-temperature liquid whose temperature has been adjusted to a predetermined temperature to the load to circulate the constant-temperature liquid;
• and
• wherein the control section controls opening degrees of the first and second electronic expansion valves and a revolution speed of the compressor according to at least one of a signal from the constant-temperature liquid temperature sensor and a signal from the refrigerant temperature sensor or a pressure sensor of the refrigerant circuit section to control the temperature of the constant-temperature liquid supplied to the load to a predetermined temperature.

A constant-temperature liquid circulating apparatus comprising:

• a constant-temperature liquid circuit section configured to cool or heat a constant-temperature liquid returned back from a load to a predetermined temperature to supply the constant-temperature liquid to the load;
• a refrigerating circuit section configured to cool or heat the constant-temperature liquid;
• and
• a control section,
• wherein the refrigerating circuit section includes a main circuit section having a compressor whose revolution speed is controlled by an inverter power source, a condenser, a first electronic expansion valve, an evaporator and piping connecting the compressor, the condenser, the first electronic expansion valve and the evaporator in series, a hot gas circuit section that has a second electronic expansion valve that bypasses the condenser and the first electronic expansion valve to supply a portion of refrigerant with a high temperature discharged from the compressor to the evaporator, and two refrigerant temperature sensors or two pressure sensors respectively provided at an inflow side and an outflow side of the evaporator of the main circuit section to detect a temperature or a pressure of a refrigerant,
• wherein the constant-temperature liquid circuit section includes a tank containing constant-temperature liquid, a heat exchanger that cools or heats the constant-temperature liquid returned back from the load in the evaporator, a first constant-temperature liquid temperature sensor and a second constant-temperature liquid temperature sensor to detect a temperature of the constant-temperature liquid, which detects the temperature of the constant-temperature liquid, and circulating means for supplying a constant-temperature liquid whose temperature has been adjusted to a predetermined temperature to the load to circulate the constant-temperature liquid, and
• wherein the control section controls opening degrees of the first electronic expansion valve according to the signal from the first and second refrigerant temperature sensors or the first and second pressure sensors provided at the inflow side and the outflow side of the evaporator, opening degrees of the second electronic expansion valve according to the signal from the second constant-temperature liquid temperature sensor, and a revolution speed of the compressor according to a signal from the first constant-temperature liquid temperature.