COOLANT SUPPLY DEVICE CONTROL UNIT Russian patent published in 2016 - IPC F25D3/10 

FIELD: control units; heating.

SUBSTANCE: coolant supply device control unit comprises power controller, which is connected with electric heater, intended for arrangement in Dewar vessel at the distance of 0-10 mm from the bottom. Control key element in power controller is bidirectional thyristor, which first anode is power control unit input terminal and is intended for connection to first output of AC voltage power supply, second anode of bidirectional thyristor is output terminal and connected to first heater output through the first group of detachable connector terminals, which second output is output, intended, through detachable connector second group of terminals, for connection to AC voltage power supply second output. Coolant supply device control unit is equipped with absence of nitrogen light indicator, presented by light-emitting diode, tracking unit and liquid nitrogen level sensor arranged in Dewar vessel at 10-30 mm above the heater. Level sensor first output is connected to tracking unit input. Tracking unit is equipped with absence of nitrogen light indicator output connection and two outputs, positive and negative, for connection to stabilized voltage power supply, the latter of which is connected through detachable connector to level sensor and heater outputs connection point. Light-emitting diode anode is connected with tracking unit light indicator, and cathode is with its negative terminal. Connection of outputs, intended for connection to AC voltage power supply second output and stabilized voltage power supply unit negative output is common for control unit power supply circuit.

EFFECT: technical result of disclosed control unit is smooth adjustment of electric heater power output in operating Dewar vessel with help of phase control, absence of liquid nitrogen in Dewar vessel alarm indication, automatic disconnection of heater at the end of liquid nitrogen in operating Dewar vessel.

1 cl, 3 dwg