Purging device, chiller equipped with same, and method for controlling purging device

Abstract

A purging device equipped with: a purging pipe for purging a gas mixture containing a coolant and a non-condensable gas from a chiller; a purging tank for storing the gas mixture purged from the purging pipe; a cooling device which cools the interior of the purging tank and condenses the coolant in the gas mixture; a drainage pipe for discharging the liquid coolant inside the purging tank to the chiller; an exhaust pipe for discharging the non-condensable gas in the gas mixture inside the purging tank to the exterior; and a control unit which stops operation of the purging device when the discharged non-condensable gas amount discharged from the exhaust pipe exceeds the introduced non-condensable gas amount introduced into the chiller.

1 . An air bleeding device comprising:
 an air bleeding pipe through which a mixed gas containing a refrigerant and an uncondensable gas is bled from a chiller;   an air bleeding tank in which the mixed gas bled through the air bleeding pipe is stored;   a cooler which cools an inside of the air bleeding tank and condenses the refrigerant in the mixed gas;   a drain pipe through which a liquid refrigerant in the air bleeding tank is discharged to the chiller;   an exhaust pipe through which the uncondensable gas in the mixed gas in the air bleeding tank is discharged to an outside; and   a control unit which stops an operation of the air bleeding device in a case where an amount of the uncondensable gas discharged through the exhaust pipe exceeds an amount of the uncondensable gas entering an inside of the chiller.   
     
     
         2 . The air bleeding device according to  claim 1 ,
 wherein the control unit obtains the amount of the discharged uncondensable gas from a density of the uncondensable gas in the air bleeding tank obtained from a temperature and a pressure in the air bleeding tank and an amount of a gas discharged through the exhaust pipe.   
     
     
         3 . The air bleeding device according to  claim 1 ,
 wherein the control unit obtains the amount of the entering uncondensable gas based on a differential pressure between a pressure in a refrigerant system of the chiller and a pressure outside the chiller.   
     
     
         4 . The air bleeding device according to  claim 1 ,
 wherein the control unit stops the operation of the air bleeding device in a case where an increase in a partial pressure of the uncondensable gas in the air bleeding tank within a preset time is equal to or less than a set value.   
     
     
         5 . A chiller comprising:
 the air bleeding device according to  claim 1 .   
     
     
         6 . A method of controlling an air bleeding device,
 the air bleeding device including   an air bleeding pipe through which a mixed gas containing a refrigerant and an uncondensable gas is bled from a chiller,   an air bleeding tank in which the mixed gas bled through the air bleeding pipe is stored,   a cooler which cools an inside of the air bleeding tank and condenses the refrigerant in the mixed gas,   a drain pipe through which a liquid refrigerant in the air bleeding tank is discharged to the chiller, and   an exhaust pipe through which the uncondensable gas in the mixed gas in the air bleeding tank is discharged to an outside,   the method comprising:   stopping an operation of the air bleeding device in a case where an amount of the uncondensable gas discharged through the exhaust pipe exceeds an amount of the uncondensable gas entering an inside of the chiller.