Pumps – With condition responsive control of coolant or lubricant
Patent
1990-06-05
1991-11-19
Bertsch, Richard A.
Pumps
With condition responsive control of coolant or lubricant
417205, 418 84, 418 87, F04C 3904, F01C 2104
Patent
active
050662023
ABSTRACT:
A method and apparatus for delivering oil into a pump chamber of a high-vacuum stage of a multi-stage pump. The method includes the steps of sensing a first pressure at an intake region of the high-vacuum stage of the pump, and sensing a second pressure at a discharge region of the high-vacuum stage of the pump. Oil is delivered to the high-vacuum stage of the pump in response to a pressure difference between the first and second pressures. Increased quantities of oil are delivered to the high-vacuum stage of the pump when the pressure difference exceeds a predetermined value. A gas ballast may also be delivered to the high-vacuum stage of the pump when the pressure difference exceeds this predetermined value. The apparatus may include a diaphragm valve including a diaphragm mounted between subchambers that are respectively in fluid communication with the intake and discharge regions of the high-vacuum stage of the pump. When the pressure differential between the intake and discharge regions, and thus the subchambers, reaches a predetermined level, the diaphragm is distended to a sufficient degree to unseat a valve element, which allows increased quantities of oil to be delivered to the high-vacuum stage of the pump.
REFERENCES:
patent: 2779533 (1957-01-01), Ziock
patent: 3395856 (1968-08-01), Clark
patent: 3707339 (1972-12-01), Budgen
patent: 4063855 (1977-12-01), Paul
patent: 4383802 (1983-05-01), Gianni
patent: 4605357 (1986-08-01), Keith
Berges Hanns-Peter
Fischer Berthold
Mueller Peter
Vorberg Dieter
Basichas Alfred
Bertsch Richard A.
Leybold Aktiengesellschaft
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