Vacuum pump with heated vapor pre-trap
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United States of America Patent
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Jun 25, 1991
Grant Date -
N/A
app pub date -
Apr 25, 1990
filing date -
Apr 25, 1990
priority date (Note) -
Expired
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Abstract
A heater equipped pre-trap chamber is provided at the upstream side of the inlet to a vacuum diaphragm pump so that gas products and solvent drawn from a specimen in a drying chamber can be subjected to a separation operation in the pre-trap chamber to remove liquid and readily condensable vapor forms of solvent. This thereby prevents entry of liquid solvent to the pump unit where it could cause damage. The inlet to the pump is located some distance above the outlet from the pre-trap chamber so that any liquid as may carryover in the flow from the pre-trap chambers towards the pump inlet, will return to the pre-trap as a gravity induced back flow. Solvent collected in the pre-trap chamber is heated to vaporize it and pass it out through the pump in that form to the outside atmosphere, making the pre-trap self-cleaning.
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