Pumps – One fluid pumped by contact or entrainment with another – Jet
Patent
1976-07-06
1978-08-22
Freeh, William L.
Pumps
One fluid pumped by contact or entrainment with another
Jet
417154, F04F 900
Patent
active
041085760
ABSTRACT:
A vacuum diffusion pump includes a body assembly fabricated from a single piece of deep drawn sheet metal whereby a cylindrical wall of the body assembly, a flange for connecting the diffusion pump to a vacuum chamber, and a floor for a pool of diffusion pump fluid are all formed from the single piece of sheet metal. A boiler for heating the fluid to a vapor includes a cylindrical heating surface centrally located in the pool and extending axially from the bottom surface of the pool. The heating surface is surrounded by a separator tube having openings close to the bottom of the pool so that liquid in the pool enters an annular space between the separator and heating surface close to the bottom of the pool and rises in the annular space while being heated to vaporization. A solid heat insulator is located in another annular space between a cup and the exterior of a segment of the body wall that confines the pool and the exterior of the floor. A cooling coil is wrapped with an uneven pitch around the exterior of a cool wall portion of the body assembly so that the coil is in contact with the hottest parts of the wall portion and cooler parts of the wall portion are not in contact with the coil. A flange clamping plate surrounds the flange to clamp it against the chamber being evacuated. A baffle plate, positioned between a first stage of the pump and the flange, is mechanically connected to the cool wall portion through a path having a high thermal conductivity so that the baffle is cool enough to condense vapor of the diffusion pump fluid that impinges on it.
REFERENCES:
patent: 2063665 (1936-12-01), Edwards
patent: 2379152 (1945-06-01), Hickman
patent: 2386299 (1945-10-01), Downing
patent: 2397591 (1946-04-01), Becker
patent: 2840297 (1958-06-01), Hickman
patent: 2943783 (1960-07-01), Bancroft et al.
patent: 3141606 (1964-07-01), Landfors
patent: 3572973 (1971-03-01), LeBlanc
patent: 3697195 (1972-10-01), Johnson et al.
Berkowitz Edward H.
Cole Stanley Z.
Freeh William L.
Herbert Leon F.
Look Edward
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