EP0340685A2
Expired / Lapsed
EP
⏱️ 0.0 years remaining
Composite vacuum pump
Assignee: Nippon Ferrofluidics Corp
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Filing: 1989-04-28
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Granted: —
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Expires: 2009-04-28
Abstract
Abstract A composite vacuum pump having first and second vacuum pumps (10,31) each having its own rotor (15,35) and drive motor (13, 33) in which the exhaust (17) of the first vacuum pump (10) is removably coupled to the inlet (36) of the second vacuum pump (31) and the first vacuum pump rotor (15) is driven at a constant torque and in which the second vacuum pump (31) has an inlet for permitting the introduction into the pump of a heavy gas for increasing the efficiency of the pumping system.
Inventors
- 👤 Akira Yamamura
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-10-29 03:36
CPC Classifications
G; G01; G01L; G01L21/00; G01L21/16; G01L21/24; F; F04; F04D; F04D19/00; F04D19/02; F04D19/04; F04D19/046; F04D25/00; F04D25/16
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
110 words
A composite vacuum pump comprising: a first vacuum pump (10) having a drive means (13) and a rotor means (15) driven by said drive means (13) contained within a housing means (12); said housing means (12) having gas inlet and gas outlet means (16,17); a second vacuum pump (31) having a drive means (33) and a rotor means (35) driven by said drive means (33) contained within a housing means (32); said housing means (32) having gas inlet and gas outlet means (36,27); said first pump outlet means (17) connected to the inlet means (36) of said second pump (31); said first drive means (13) being driven at constant torque.
Claim 2
Dependent Claim
110 words
A composite vacuum pump comprising: a first vacuum pump (10) having a drive means (13) and a rotor means (15) driven by said drive means (13) contained within a housing means (12); said housing means (12) having gas inlet and gas outlet means (16,17); a second vacuum pump (31) having a drive means (33) and a rotor means (35) driven by said drive means (33) contained within a housing means (32); said housing means (32) having gas inlet and gas outlet means (36,27); said first pump outlet means (17) connected to the inlet means (36) of said second pump (31); said first drive means (13) being driven at constant torque.
Claim 3
Dependent Claim
22 words
The device claimed in claim 1 wherein said first pump outlet means (17) is disconnected from said second pump inlet means (36).
Claim 4
Dependent Claim
34 words
The device claimed in claim 1 including further means for detecting the torque load on said first pump drive means (13) when said second pump drive means (33) is driven at a predetermined speed.
Claim 5
Dependent Claim
38 words
The device claimed in claim 1 including further second gas inlet means (50) formed in said second pump housing means (32) in which said second inlet means (50) communicates with the inlet means (36) of said second pump.
References Cited (Backward Citations)
No citation records indexed.
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