Regulator with receiver for refrigerators and heatpumps

Abstract

The regulator is a refrigerant regulator intended for heatpumps and refrigerators. It has a built-in receiver, which automatically absorbs redundant refrigerant. It is a hermetic closed device without removable parts. It is robust and there is no need for adjustment. The regulator is composed of a heat exchanger with large heat capacity, a receiver and two pressure reducing valves. The two valves behave different on boiling fluid flow. One of them, named a heat sensitive valve, restricts fluid flow when the fluid is boiling. In the other valve, named a pressure sensitive valve, the boiling has no influence on the fluid flow. The regulator controls the refrigerant flow from the receiver to the evaporator by means of the pressure in the receiver—and the pressure in the receiver is controlled, via the heat exchanger, by the need of refrigerant in the evaporator. This way of control ensures 100% use of the evaporator, the suction gas is superheated, and the liquid from the condenser is sub-cooled. These factors improve the relation between the cooling capacity and the power consumption with more than 10%.

1 . A refrigeration circuit comprising compressor ( 16 ), condenser ( 15 ), evaporator ( 13 ) and with heat transfer between suction gas and liquid from the condenser in heat exchanger ( 18 ) and where there between condenser and heat exchanger is capillary throttling ( 17 ) of the refrigerant and receiver ( 19 ), capillary throttling ( 20 ) from receiver to evaporator characterised in that capillary throttling ( 20 ) occurs during heat transfer between the refrigerant entering the capillary tube and the refrigerant leaving the capillary tube and the heat exchanger ( 18 ) is worked out with large heat capacity.  
     
     
         2 . A closed refrigeration circuit as claimed in  claim 1  with the capillary throttle ( 20 ) between receiver ( 19 ) and evaporator ( 13 ) elaborated like a SelfCoolingValve as showed on FIG. 1, composed of an outer shell ( 3 ), a heat exchanger ( 1 ), entering into a capillary tube ( 2 ), which free end is leaded up to the entry point of the heat exchanger, characterised in the fluid at entry of the valve ( 4 ) is subcooled down to the temperature at the exit of the valve ( 5 ), before the fluid reachs the capillary tube ( 2 ).  
     
     
         3 . A closed refrigeration circuit as claimed in  claim 1 , characterised in that the heat exchanger ( 18 ) has thermal contact with a reservoir of water, which contribute to the heat capacity of the heat exchanger.