Patent ID: 6185949
Filing Date: 2001-02-13
Classification: F04C,F25B

Abstract:
In a refrigeration system including a compressor having a discharge line for discharging gaseous refrigerant and a suction line for admitting gaseous refrigerant, a condenser having a liquid refrigerant outlet and an evaporator, each connected to the compressor and to each other, a liquid refrigerant injection system for controlling discharge gas temperature, comprising:a temperature sensor operatively associated with the compressor, for sensing the temperature of compressed discharge gaseous refrigerant;a fluid line connecting the outlet of the condenser to the suction line of the compressor for conducting a liquid refrigerant fluid flow to the compressor;an injection valve, operatively connected to said fluid line, for injecting liquid refrigerant into the suction line of the compressor, said injection valve including an adjustable orifice through which liquid refrigerant is expanded into the suction line, said adjustable orifice provided by one of a plurality of fluid injection pills, each releasably attached downstream to said valve and each with a different aperture size therethrough; anda controller operatively connected to said sensor, for selectively actuating said valve based on the temperature of the gaseous refrigerant.