Method and apparatus for refrigerant recovery
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United States of America Patent
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-
Apr 19, 1994
Issued Date -
N/A
app pub date -
Apr 2, 1993
filing date -
Dec 31, 1992
priority date (Note) -
Expired
status (Latency Note)
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Abstract
Refrigerant is recovered using a single pump unit, regardless of the refrigerant's phase. This is achieved by sensing the phase of the refrigerant and changing the pump's operation accordingly. The refrigerant phase can be sensed by a temperature-responsive element, such as a thermistor, or by other phase-sensing technology. In a preferred embodiment, the pump unit is a vane pump whose rotational speed is changed in response to the refrigerant's phase. If liquid refrigerant is sensed,, the pump operates at a lower speed. If gas refrigerant is sensed, the pump operates at a higher speed. The two speeds are chosen so that the pump will draw an EPA-specified vacuum on the refrigerant present. In other vane-pump embodiments, the pump's operation is changed by changing rotational speed.
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