Patent US5151010A successfully refreshed from Google Patents.
US5151010A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Combined centrifugal and vacuum pump
Assignee: Sulzer Pumpen AG
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Filing: 1990-09-07
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Granted: 1992-09-29
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Expires: 2010-09-07
Abstract
Abstract A centrifugal pump for pumping gas containing fiber suspensions in the pulp and paper industry includes a centrifugal pumping chamber (54); a centrifugal impeller (60) within the pumping chamber; a liquid ring vacuum pump (70) having a radially vaned vacuum pump rotor (96) therein; an intermediate wall (72) separating the pumping chamber (54) from the vacuum pump (70) which has a non-annular volume (146) therein and which provides a passageway between the centrifugal pumping chamber (54) and the vacuum (70). A conduit (71) within the intermediate wall (72) is connected to the non-annular volume (146) for introducing a liquid into at least one of the non-annular volume and the vacuum pump.
Inventors
- 👤 Reijo Vesala
- 👤 Vesa Vikman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 21:04
CPC Classifications
F; F04; F04D; F04D7/00; F04D7/02; F04D7/04; F04D7/045; F05; F05B; F05B2210/00; F05B2210/10; F05B2210/13; F05B2210/132
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
110 words
A centrifugal pump for pumping gas containing medium comprising: a centrifugal pumping chamber (54); a centrifugal impeller (60) within said pumping chamber; a liquid ring vacuum pump (70) having a vaned vacuum pump rotor (96) therein; an intermediate wall (72) separating said pumping chamber (54) from said vacuum pump (70) and having a first non-annular opening (74) adjacent said pumping chamber for providing a passageway between said centrifugal pumping chamber (54) and said vacuum pump; and a shaft (58) extending through said vacuum pump (70) and said intermediate wall (72) into said pumping chamber (54), said centrifugal impeller (60) and said vacuum pump rotor (96) being mounted on said shaft.
Claim 2
Dependent Claim
110 words
A centrifugal pump for pumping gas containing medium comprising: a centrifugal pumping chamber (54); a centrifugal impeller (60) within said pumping chamber; a liquid ring vacuum pump (70) having a vaned vacuum pump rotor (96) therein; an intermediate wall (72) separating said pumping chamber (54) from said vacuum pump (70) and having a first non-annular opening (74) adjacent said pumping chamber for providing a passageway between said centrifugal pumping chamber (54) and said vacuum pump; and a shaft (58) extending through said vacuum pump (70) and said intermediate wall (72) into said pumping chamber (54), said centrifugal impeller (60) and said vacuum pump rotor (96) being mounted on said shaft.
Claim 3
Dependent Claim
31 words
The centrifugal pump as claimed in claim 1, additionally comprising a second non-annular volume (146) within said intermediate wall (72) extending between said first non-annular opening (74) and said vacuum pump.
Claim 4
Dependent Claim
45 words
The centrifugal pump as claimed in claim 2, additionally comprising a conduit (71) within said intermediate wall (72) and connected to said second non-annular volume (146) for introducing a liquid into at least one of said second non-annular volume (146) and said vacuum pump (70).
Claim 5
Dependent Claim
77 words
The centrifugal pump as claimed in claim 2, wherein said vacuum pump (70) has a pressure side and a suction side and additionally comprising a gas inlet opening (94) at said suction side and communicating with said second non-annular volume (146); a rear wall (110) opposite said gas inlet opening (94); a gas discharge opening (80) at said pressure side; and a make-up air inlet duct (84) extending into said vacuum (70) through said rear wall (110).
Claim 6
Dependent Claim
70 words
The centrifugal pump as claimed in claim 2, additionally comprising a conduit (71) within said intermediate plate (72); a gas inlet port (94) in said intermediate wall connecting said vacuum pump (70) with said non-annular volume (146); and said conduit (71) being connected to said non-annular volume (146) for introducing a liquid into at least one of said gas inlet opening (94), non-annular volume (146) and said non-annular opening (74).
Claim 7
Dependent Claim
73 words
The centrifugal pump as claimed in claim 1, wherein said vacuum pump comprises a front wall (112) and a rear wall (110) opposite said front wall; said vacuum pump rotor (96) being mounted for rotation on said shaft between said front and said rear wall at a distance therefrom; and means for axially adjusting said distance between said vacuum pump rotor and at least one of said front wall and said rear wall.
Claim 8
Dependent Claim
35 words
The centrifugal pump as claimed in claim 6 wherein said distance between said vacuum pump rotor (96) and said respective front and rear walls (112, 110) of said pump 70 is less than 0.30 mm.
Claim 9
Dependent Claim
71 words
The centrifugal pump as claimed in claim 6, wherein said adjustment means for the axial adjustment comprises a first shoulder (104) on said shaft (58) and an oppositely extending second shoulder (105) on said rotor (96) facing said first shoulder (104) of said shaft and spacing means (106) between said shoulders for adjusting the position of said rotor (96) relative to said front and rear wall of said vacuum pump (70).
Claim 10
Dependent Claim
29 words
The centrifugal pump as claimed in claim 8, wherein said spacing means comprises one or more shims for placement between said first shoulder (104) and said second shoulder (105).
Claim 11
Dependent Claim
23 words
The centrifugal pump as claimed in claim 1, additionally comprising a rotor having fluidizing blades, said rotor mounted in front of said impeller.
References Cited (Backward Citations)
US4776758A
Cited
US4877368A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-09-29 | 1996-03-30 | 1996-09-29 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-29 | 2000-03-30 | 2000-09-29 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-29 | 2004-03-30 | 2004-09-29 | $7700.00 | Window Closed / Lapsed |