초록 ▼

A refrigeration system including a pressure actuated switch for controlling the refrigeration compressor. The actuator of the switch is connected directly to the refrigerant line by a small capillary tube so that changes in refrigerant pressure effect changes in the position of the switch. Positione

A refrigeration system including a pressure actuated switch for controlling the refrigeration compressor. The actuator of the switch is connected directly to the refrigerant line by a small capillary tube so that changes in refrigerant pressure effect changes in the position of the switch. Positioned between the pressure actuated switch and the refrigerant line is a bi-directional check valve which permits refrigerant pressure changes to be transmitted through the capillary line to the pressure actuated switch, but which functions to seal off the refrigerant line in the event of a break in the capillary tube.

대표청구항 ▼

1. A refrigeration cooling system which comprises a motor driven compressor for increasing the pressure of a refrigerant material in said system; a condenser for removing heat to cool said pressurized refrigerant material after it exits from said compressor; an expansion valve; an evaporator through

1. A refrigeration cooling system which comprises a motor driven compressor for increasing the pressure of a refrigerant material in said system; a condenser for removing heat to cool said pressurized refrigerant material after it exits from said compressor; an expansion valve; an evaporator through which said cooled pressurized refrigerant passes to extract heat from the area surrounding said evaporator before being returned to the inlet side of said compressor; and a control unit for controlling the operation of said compressor, said control unit comprising a pressure actuated switch to control operation of said compressor and a capillary tube connecting said switch with the flow path of said refrigerant, the improvement in combination therewith which comprises: a bi-directional check valve positioned between said pressure actuated switch and the flow path of said refrigerant, said valve permitting refrigerant pressure changes to be transmitted directly through said capillary tube to said pressure actuated switch so long as said capillary line remains unbroken, said check valve further functioning to seal off the flow path of said refrigerant in the event a break occurs in said tube. 2. The refrigeration cooling system of claim 1 in which said capillary tube connects said pressure actuated switch through said check valve to the low pressure side of the refrigerant flow path between the evaporator and the high pressure side of the compressor. 3. The refrigeration cooling system of claim 1 in which said capillary tube connects said pressure actuated switch through said check valve to the high pressure side of the refrigerant flow path between the low pressure side of the compressor and the condenser. 4. The refrigeration cooling system of claim 3 in which said check valve is provided with a pressure relief plug adapted to be actuated in the event of pressure build up beyond a preset value. 5. The refrigeration cooling system of claim 1 in which the bi-directional check valve comprises a valve chamber provided with a by-pass port and with ports in the ends of said chamber for connecting it with the refrigerant flow path at one end and the capillary tube at the other end; a ball check positioned in said chamber between the ends of two coiled springs, the other ends of said springs being seated against the ends of said chamber; and valve seats at the ends of said chamber for seating the ball check. 6. The refrigeration cooling system of claim 5 which further includes a press fitted pressure relief plug in the wall of said chamber.