Two-stage positive displacement pump

Details Two-stage positive displacement pump Two-stage positive displacement pump

1994-04-11

1995-02-07

Bertsch, Richard A.

Pumps

Diverse pumps

Including rotary nonexpansible chamber type

417205, 417266, F04B 2308

Patent

active

053870905

ABSTRACT:
A two-stage positive displacement pump (1) is used in particular to operate in conjunction with a turbomolecular pump (2) that can be placed ahead of it in series. The two-stage positive displacement pump (1) is configured as a hybrid pump (3) that has on the medium-entry side a reciprocating pump (5) with a comparatively large displacement area (6), whereby its piston-cylinder space (7) is sealed off with respect to the crank area (8) by means of a sealing membrane (9). Also as a part of this two-stage positive displacement pump (1) which forms the hybrid pump (3), there is placed in series behind the reciprocating pump (5) a diaphragm pump (10), whose displacement area (11) is noticeably smaller compared to that of the reciprocating pump (5).

REFERENCES:
patent: 2592940 (1952-04-01), Monoyer
patent: 3145914 (1964-08-01), Nicholas
patent: 3190545 (1965-06-01), Weber et al.
patent: 3281065 (1966-10-01), Chaffiotte
patent: 3578880 (1971-05-01), Cygnor
patent: 3672791 (1972-06-01), Zimmerly
patent: 4505647 (1985-03-01), Alloca et al.
English Translation of portions of German Office Action dated Jan. 10, 1994 in counterpart German Priority Application P 43 20 963.7-15.
"Labovac.RTM. Linear-Membranpumpen und Kolbenpumpen" Brochure of Saskia Hochvakuum under Labortechnik GmbH.
"Labovac.RTM. D 65-D 1600 Dry Trocken Sec" Brochure of Saskia Hochvakuum under Labortechnik GmbH.

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