Method of and system for determining refrigerant/lubricant ratio

Details Method of and system for determining refrigerant/lubricant ratio Method of and system for determining refrigerant/lubricant ratio

1988-08-12

1990-04-17

Tanner, Harry B.

Refrigeration

With indicator or tester

Condition sensing

73 611R, G01K 1300

Patent

active

049169157

ABSTRACT:
A system for and method of measuring refrigerant-to-lubricant ratio of liquid within a conduit having a wall and forming part of an enclosed air conditioning refrigerating apparatus which includes a compressor, an evaporator and a condenser. The system involves a first transducer for generating at least one pulse of ultrasonic energy which is coupled via the wall into a path of substantially predetermined length within the liquid. The least one pulse of ultrasonic energy is coupled from the end of the path via the wall and received by a second transducer. Circuitry responsive to the at least one ultrasonic pulse as transmitted and received determines velocity of the ultrasonic pulse within the liquid as a measure of the refrigerant-to-lubricant ratio. The method includes the steps of generating a pulse of ultrasonic energy, coupling the pulse of ultrasonic energy into the path of predetermined length within the liquid, and coupling the pulse of ultrasonic energy from the end of the path of predetermined length within the liquid. The ratio is derived from determining the velocity of the ultrasonic pulse within the liquid from its transit time along the path of predetermined length.

REFERENCES:
patent: 3283562 (1966-11-01), Heisig et al.
patent: 3413595 (1968-11-01), Babikov et al.
patent: 3738118 (1973-06-01), Jacobs
patent: 3844163 (1974-10-01), Di Leo
patent: 4090371 (1978-05-01), Keane
patent: 4122713 (1978-10-01), Stasz et al.
patent: 4138879 (1979-02-01), Liebermann
patent: 4522068 (1985-06-01), Smith

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