US3721508A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Liquid-ring pump with control valves
Assignee: Siemens AG
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Filing: 1971-05-11
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Granted: 1973-03-20
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Expires: 1991-05-11
Abstract
Abstract Liquid-ring pump includes a vane rotor, a housing structure enclosing the rotor and having suction and compression ports communicating with intervane spaces of the rotor at respective suction and pressure localities thereof, pump outlet means, pressure-responsive control valves located outside the housing structure, pressure lines connecting the control valves, respectively, with the compression ports of the housing structure, the valves having respective outlets communicating with the pump outlet means, and shut-off valve means serially connected with each of the respective control valves.
Inventors
- 👤 K Mugele
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 18:37
CPC Classifications
F; F04; F04C; F04C19/00; F04C19/005
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
82 words
Liquid-ring pump comprising a vane rotor, a housing structure enclosing said rotor and having suction and compression ports communicating with intervane spaces of said rotor at respective suction and pressure localities thereof, pump outlet means, pressure-responsive control valves located outside said housing structure, pressure lines connecting said control valves, respectively, with said compression ports of said housing structure, said valves having respective outlets communicating with said pump outlet means, and shut-off valve means serially connected with each of said respective control valves.
Claim 2
Dependent Claim
82 words
Liquid-ring pump comprising a vane rotor, a housing structure enclosing said rotor and having suction and compression ports communicating with intervane spaces of said rotor at respective suction and pressure localities thereof, pump outlet means, pressure-responsive control valves located outside said housing structure, pressure lines connecting said control valves, respectively, with said compression ports of said housing structure, said valves having respective outlets communicating with said pump outlet means, and shut-off valve means serially connected with each of said respective control valves.
Claim 3
Dependent Claim
52 words
Liquid-ring pump according to claim 1, wherein said housing structure forms a chamber axially adjacent each side of said rotor, and said housing structure has control plate members located axially between each side of said rotor and the adjacent chamber, said suction and compression ports being provided in said control plate members.
Claim 4
Dependent Claim
28 words
Liquid-ring pump according to claim 1, comprising a manifold to which said respective outlets of said control valves are connected and which communicates with said pump outlet means.
Claim 5
Dependent Claim
54 words
In a liquid-ring pump according to claim 1, wherein said housing structure forms a chamber axially adjacent each side of said rotor, said pump outlet means comprising a compression duct communicating with said chamber, and a manifold to which said respective outlets of said control valves are connected and which communicates with said chamber.
Claim 6
Dependent Claim
65 words
In a liquid-ring pump according to claim 1, wherein said housing structure forms a chamber axially adjacent each side of said rotor, said pump outlet means comprising a compression duct communicating with said chamber and other compression duct means separate from said chamber, and a manifold to which said respective outlets of said control valves are connected and which communicates with said other duct means.
Claim 7
Dependent Claim
36 words
Liquid-ring pump according to claim 1, comprising a return line connected with said valve outlets and leading therefrom bAck to the suction side of the pump for increasing the pump efficiency at less than rated load.
Claim 8
Dependent Claim
46 words
Liquid-ring pump according to claim 1, comprising a parallel branch line with shut-off means extending parallel to said valves in each of said pressure lines, said branch line being connected between respective locations communicating with said pressure lines upstream and downstream of the respective control valves.
Claim 9
Dependent Claim
80 words
Liquid-ring pump according to claim 3, comprising at least one parallel branch line with shut-off means extending parallel to said control valves in each of said pressure lines, said branch line being connected between respective locations communicating with said pressure lines upstream and downstream of the respective control valves, and a return line with shut-off means connecting said branch line to the suction side of the pump, and shut-off valve means interposed between said parallel branch line and said manifold.
Claim 10
Dependent Claim
30 words
In a liquid-ring pump according to claim 4, said shut-off valve means comprising two shut-off valves interposed in each of said pressure lines ahead and arrear of said control valve.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1976-03-19 | 1976-09-18 | 1977-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-19 | 1980-09-18 | 1981-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-19 | 1984-09-18 | 1985-03-20 | $7700.00 | Window Closed / Lapsed |