Rotary expansible chamber devices – Heat exchange or non-working fluid lubricating or sealing – With condition responsive control of non-working fluid
Patent
1976-01-16
1977-10-18
Croyle, Carlton R.
Rotary expansible chamber devices
Heat exchange or non-working fluid lubricating or sealing
With condition responsive control of non-working fluid
418 87, 184 616, 417228, F01C 2104, F04C 1504, F04C 2902
Patent
active
040544010
ABSTRACT:
A vacuum pump, having a pumping chamber with intake and exhaust ports communicating therewith, is provided with an arrangement to insert a liquid lubricant into the pumping chamber. A sensing device is utilized to detect the pressure at the exhaust port, the sensing device permitting operation of a deactivating unit when the pressure at the exhaust port falls below a predetermined value, pressure below the predetermined value being indicative of improper pumping action in the pump. The deactivating unit acts to render inoperative the lubricant introducing arrangement when the sensing device detects a pressure at the exhaust port below the predetermined value, thus precluding the insertion of lubricant into the pumping chamber upon the occurrence of defective pumping action in the vacuum pump.
REFERENCES:
patent: 1031214 (1912-07-01), Wadsworth
patent: 1346165 (1920-07-01), Berrenberg
patent: 2285426 (1942-06-01), Freeman
patent: 2705123 (1955-03-01), Hieger
patent: 2762349 (1956-09-01), Malcolm
patent: 3243103 (1966-03-01), Bellmer
patent: 3649140 (1972-03-01), Harlin
patent: 3707339 (1972-12-01), Budgen
Central Scientific Company, Inc.
Croyle Carlton R.
Ross Thomas I.
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