CONSTANT-TEMPERATURE LIQUID CIRCULATION APPARATUS AND OPERATION METHOD THEREOF

摘要

An operation method of a constant-temperature liquid circulation apparatus includes: performing control such that the fan is not activated, or is activated to maintain a minimum rotation speed when a refrigerant pressure measured by the pressure sensor does not reach a reference pressure region after the compressor is activated; controlling the refrigerant pressure by performing inverter control on a rotation speed of the fan when the refrigerant pressure reaches the reference pressure region; and controlling a rotation speed of the compressor to be reduced from a high rotation speed which is a rotation speed during a steady operation while maintaining the rotation speed of the fan at a maximum rotation speed when the refrigerant pressure continues to further rise and exceeds an upper limit value even after the rotation speed of the fan reaches the maximum rotation speed.

主权项

1. A constant-temperature liquid circulation apparatus comprising:
a constant-temperature liquid circuit supplying a temperature-adjusted constant-temperature liquid to a load; a refrigeration circuit adjusting a temperature of the constant-temperature liquid by heat exchange of the constant-temperature liquid with a refrigerant; and a controller controlling the entire apparatus, wherein the refrigeration circuit includes: a compressor compressing a gaseous refrigerant to change the refrigerant into a high-temperature and high-pressure gaseous refrigerant; an air-cooling condenser cooling the high-temperature and high-pressure gaseous refrigerant sent from the compressor to change the refrigerant into a high-pressure liquid refrigerant; a fan forcing cooling air to flow into the condenser; an expansion valve expanding the high-pressure liquid refrigerant sent from the condenser to change the refrigerant into a low-temperature and low-pressure liquid refrigerant; an evaporator evaporating the low-temperature and low-pressure liquid refrigerant sent from the expansion valve by heat exchange with the constant-temperature liquid to change the refrigerant into a low-pressure gaseous refrigerant, thereby sending the low-pressure gaseous refrigerant to the compressor; and a pressure sensor measuring an inlet-side refrigerant pressure of the expansion valve, and wherein the controller is configured perform control such that the fan is not activated, or is activated to maintain a minimum rotation speed when a refrigerant pressure measured by the pressure sensor does not reach a reference pressure region after the compressor is activated, control the refrigerant pressure by performing inverter control on a rotation speed of the fan when the refrigerant pressure reaches the reference pressure region, and control a rotation speed of the compressor to be reduced from a high rotation speed which is a rotation speed during a steady operation while maintaining the rotation speed of the fan at a maximum rotation speed when the refrigerant pressure continues to further rise and exceeds an upper limit value even after the rotation speed of the fan reaches the maximum rotation speed.