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Jouve S.A., EPO - Publication - KB, TaggedPDF v1.27
EP-0607687-A2-19940727
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EP-0607687-A2-19940727
A multistage vacuum pump is achieved by utilizing a single piston and cylinder assembly having opposite end portions with substantially equal diameters and an enlarged diameter central portion. One end of the cylinder is closed by a valve and a first stage pumping chamber is defined between the valve and the piston. The enlarged diameter portion of the piston has an axial extent less than the axial extent of the enlarged diameter portion of the cylinder to define second and third stage pumping chambers on opposite sides of the enlarged diameter portion of the piston. The three pumping chambers are interconnected by passage means to an inlet and outlet to provide a sequential reduction in pressure. A single drive unit may be connected to a plurality of pumping units for reciprocating the piston in each pumping unit.
A multistage vacuum pump is achieved by utilizing a single piston and cylinder assembly having opposite end portions with substantially equal diameters and an enlarged diameter central portion. One end of the cylinder is closed by a valve and a first stage pumping chamber is defined between the valve and the piston. The enlarged diameter portion of the piston has an axial extent less than the axial extent of the enlarged diameter portion of the cylinder to define second and third stage pumping chambers on opposite sides of the enlarged diameter portion of the piston. The three pumping chambers are interconnected by passage means to an inlet and outlet to provide a sequential reduction in pressure. A single drive unit may be connected to a plurality of pumping units for reciprocating the piston in each pumping unit.
en
European Patent Office
EP0607687
EP 0607687
F04B 37/14
F04B 25/02
F04B 37/16
F04B 41/06
F04B 49/00
Multistage vacuum pump
Multistage vacuum pump - European Patent Office - EP 0607687 A2
Multistage vacuum pump - European Patent Office - EP 0607687 A2
Adobe PDF Library 8.0
"EP0607687"; "EP 0607687"; "F04B 37/14"; "F04B 25/02"; "F04B 37/16"; "F04B 41/06"; "F04B 49/00"; "Multistage vacuum pump"
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1992-12-21
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1993-09-07
F04B 37/14
F04B 25/02
F04B 37/16
F04B 41/06
F04B 49/00
THE COMMONWEALTH SCIENTIFIC AND INDUSTRIAL RESEARCH ORGANISATION
FUJI SEIKI INC.
Bez, Eckhard
Senior, Alan Murray et al
Multistage vacuum pump
Mehrstufige Vakuumpumpe
Multistage vacuum pump
Pompe à vide multi-étagée
A multistage vacuum pump is achieved by utilizing a single piston and cylinder assembly having opposite end portions with substantially equal diameters and an enlarged diameter central portion. One end of the cylinder is closed by a valve and a first stage pumping chamber is defined between the valve and the piston. The enlarged diameter portion of the piston has an axial extent less than the axial extent of the enlarged diameter portion of the cylinder to define second and third stage pumping chambers on opposite sides of the enlarged diameter portion of the piston. The three pumping chambers are interconnected by passage means to an inlet and outlet to provide a sequential reduction in pressure. A single drive unit may be connected to a plurality of pumping units for reciprocating the piston in each pumping unit.
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