US3655295A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Mechanical seal for centrifugal pumps
Assignee: ECO PUMP CORP
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Filing: 1970-10-01
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Granted: 1972-04-11
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Expires: 1990-10-01
Abstract
Abstract A mechanical seal for centrifugal pumps having a fixed bearing mounted in the housing of the pump for supporting the shaft of the pump, a rotating sealing disk mounted on the shaft in contact with the fixed bearing, the bearing and sealing disk being surrounded by a cavity formed in the housing and a cup shaped slinger mounted on the shaft between the cavity and impeller of the pump for introducing and retaining fluid in the cavity for lubricating and cooling the bearing and sealing disk even when the flow of fluid through the pump stops.
Inventors
- 👤 William Mitchell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 16:16
CPC Classifications
F; F16; F16J; F16J15/00; F16J15/16; F16J15/34; F16J15/3404; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F05; F05B; F05B2240/00; F05B2240/70; F05D; F05D2260/00; F05D2260/60; F05D2260/602; F05D2260/6022
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
143 words
In a centrifugal pump, a pump housing comprising a front section having a pumping cavity and axial inlet opening, a rear section having a longitudinal bore, a bearing fixedly mounted in said bore having a recess in its inner end, a shaft rotatably mounted in sAid bearing and extending into the pumping cavity of said front section, an impeller mounted on the free end of said shaft in spaced relation to said bearing, a sealing disk mounted on said shaft and disposed in the recess of said bearing, a cavity formed in the rear section of said housing surrounding said shaft and sealing disk, and a cup shaped slinger fixedly mounted on said shaft between said impeller and sealing disk having its side walls inclined outwardly in close spaced relation to the wall of the cavity in the rear section of said housing.
Claim 2
Dependent Claim
143 words
In a centrifugal pump, a pump housing comprising a front section having a pumping cavity and axial inlet opening, a rear section having a longitudinal bore, a bearing fixedly mounted in said bore having a recess in its inner end, a shaft rotatably mounted in sAid bearing and extending into the pumping cavity of said front section, an impeller mounted on the free end of said shaft in spaced relation to said bearing, a sealing disk mounted on said shaft and disposed in the recess of said bearing, a cavity formed in the rear section of said housing surrounding said shaft and sealing disk, and a cup shaped slinger fixedly mounted on said shaft between said impeller and sealing disk having its side walls inclined outwardly in close spaced relation to the wall of the cavity in the rear section of said housing.
References Cited (Backward Citations)
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Cited
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Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-11 | 1975-10-11 | 1976-04-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-11 | 1979-10-11 | 1980-04-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-11 | 1983-10-11 | 1984-04-11 | $7700.00 | Window Closed / Lapsed |