Method and apparatus for recovering refrigerant

Details Method and apparatus for recovering refrigerant Method and apparatus for recovering refrigerant

1991-06-17

1992-09-15

Rivell, John

Refrigeration

Automatic control

Withdrawing or adding refrigerant from or to normally closed...

62 77, 62292, F25B 4500

Patent

active

051467615

ABSTRACT:
A method and apparatus for recovering compressible refrigerant from a refrigeration system and delivering the recovered refrigerant to a refrigerant storage container. Means are provided for determining the type of refrigerant being recovered and for determining the ambient temperature. The recovery method includes the steps of withdrawing refrigerant from a refrigeration system being serviced and compressing the withdrawn refrigerant in a compresser to form a high pressure gas. A high pressure gaseous refrigerant is delivered to a condenser where it is condensed to form liquid refrigerant. The liquid refrigerant from the condenser is delivered to the refrigerant storage means. Means are provided for stopping the withdrawal of refrigerant from the refrigeration system being serviced when a predetermined event occurs. At that point, the system begins to withdraw stored refrigerant from the storage container. The refrigerant withdrawn from the storage container is then compressed in the same compresser which was used to compress refrigerant withdrawn from the refrigeration system. This refrigerant is then condensed and passed through an expansion device. If the refrigerant is not a higher pressure refrigerant, such as R-22 or R-502 it is passed through an expansion device having a predetermined effective refrigerant metering capability. If the refrigerant is a higher pressure refrigerant, such as R-22 or R-502, and the ambient temperature is greater than a predetermined value, it is passed through a flow control valve having an effective refrigerant metering capability which is between 5 to 20 times larger than the predetermined effective refrigerant metering capability of the expansion device.

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patent: 4998416 (1991-03-01), Van Steenburgh, Jr.
patent: 5022230 (1991-06-01), Todack
patent: 5050401 (1991-09-01), Van Steenburgh, Jr.

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