US4380416A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Centrifugal pumps
Assignee: Societe Internationale de Mecanique Industrielle SA
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Filing: 1981-02-11
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Granted: 1983-04-19
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Expires: 2001-02-11
Abstract
Abstract A centrifugal pump, of the type comprising a body, a shaft rotatable in the body via a bearing, an impeller fixed on the shaft and, between the impeller and the bearing, a mechanical seal assembly comprising a pair of engaging slide rings and an inner sleeve made of elastomeric material, fitted on the shaft, the said sleeve comprising a portion adjacent the impeller on which is fixed one of the slide rings and, at the end on the bearing side, a radial flare for holding the seal assembly in the assembled state prior to its mounting, said sleeve being extended axially, beyond said radial flare, by a lip member arranged to rub on the adjacent surface of the bearing.
Inventors
- 👤 Jean Menager
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:38
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F16; F16J; F16J15/00; F16J15/002; F16J15/004; F16J15/16; F16J15/34; F16J15/36; F05; F05D; F05D2260/00; F05D2260/60; F05D2260/602; F05D2260/6022
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
193 words
A centrifugal pump, of the type comprising a body, a shaft rotatably mounted in the body via a bearing, an impeller fixed on the shaft and, between the impeller and the bearing, a mechanical seal assembly comprising a pair of engaging slide rings and an inner sleeve made of elastomeric material fitted on the shaft, said sleeve comprising a portion at the end adjacent the impeller on which is fixed one of the slide rings and, at the other end adjacent the bearing, a radial flare for holding the seal assembly in the assembled state prior to its mounting and after mounting functioning as a flinger to radially throw off any liquid on its surface during operation of the pump, an axial extension on said sleeve between said radial flare and said bearing, a seal member at the bearing end of said axial extension comprising a lip member integral with said sleeve and having an axially facing portion which in use sealingly engages a part of said bearing to prevent bearing lubricant from leaking into said seal assembly, and a radially extending opening through said pump body substantially aligned with said radial flare.
Claim 2
Dependent Claim
193 words
A centrifugal pump, of the type comprising a body, a shaft rotatably mounted in the body via a bearing, an impeller fixed on the shaft and, between the impeller and the bearing, a mechanical seal assembly comprising a pair of engaging slide rings and an inner sleeve made of elastomeric material fitted on the shaft, said sleeve comprising a portion at the end adjacent the impeller on which is fixed one of the slide rings and, at the other end adjacent the bearing, a radial flare for holding the seal assembly in the assembled state prior to its mounting and after mounting functioning as a flinger to radially throw off any liquid on its surface during operation of the pump, an axial extension on said sleeve between said radial flare and said bearing, a seal member at the bearing end of said axial extension comprising a lip member integral with said sleeve and having an axially facing portion which in use sealingly engages a part of said bearing to prevent bearing lubricant from leaking into said seal assembly, and a radially extending opening through said pump body substantially aligned with said radial flare.
Claim 3
Dependent Claim
34 words
A pump as claimed in claim 1, wherein said bearing is a ball bearing having a washer fixed to the outer cage of the bearing and said lip member sealingly engages against said washer.
Claim 4
Dependent Claim
15 words
A pump as claimed in claim 2, wherein said lip member is turned radially inwardly.
Claim 5
Dependent Claim
33 words
A pump as claimed in claim 1, wherein said bearing is a ball bearing having a radial wall on the outer cage thereof, and said lip member sealingly engages against said radial wall.
Claim 6
Dependent Claim
38 words
A pump as claimed in claim 1, wherein the bearing is a ball bearing having an outer cage and said outer bearing cage has an axial extension in which is fitted the fixed part of the seal assembly.
Claim 7
Dependent Claim
48 words
A pump as claimed in claim 5, wherein the seal assembly includes a bellows which comprises a peripheral portion molded on a metal casing which is fitted in said extension, said peripheral portion terminating in a radial bead which sealingly engages the inner wall of the pump body.
Claim 8
Dependent Claim
24 words
A pump as claimed in claim 6, wherein said extension and pump body have openings substantially aligned with the radial flare of the sleeve.
Claim 9
Dependent Claim
184 words
A seal assembly for a centrifugal pump, comprising a sleeve of elastomeric material, a counter-ring tightened on an end portion of the sleeve, a slide ring in contact with the counter-ring, a resilient bellows one end of which supports the slide ring and the other end of which is fixed to a casing comprising a tubular part, a spring biasing the slide ring into engagement with the counter-ring, the sleeve having at its other end a radial flare which functions as a stop for the casing to hold the seal assembly in the assembled state when not in use and when rotating in use functions as a flinger to radially throw off any liquid on its surface during operation of the pump, an axial extension integral with said sleeve and extending beyond said radial flare, a seal member at the outer end of said axial extension comprising a circular lip member integral with said axial extension and having an axially facing portion which in use functions as a seal when engaging a bearing part to prevent bearing lubricant from leaking into said seal assembly.
Claim 10
Dependent Claim
184 words
A seal assembly for a centrifugal pump, comprising a sleeve of elastomeric material, a counter-ring tightened on an end portion of the sleeve, a slide ring in contact with the counter-ring, a resilient bellows one end of which supports the slide ring and the other end of which is fixed to a casing comprising a tubular part, a spring biasing the slide ring into engagement with the counter-ring, the sleeve having at its other end a radial flare which functions as a stop for the casing to hold the seal assembly in the assembled state when not in use and when rotating in use functions as a flinger to radially throw off any liquid on its surface during operation of the pump, an axial extension integral with said sleeve and extending beyond said radial flare, a seal member at the outer end of said axial extension comprising a circular lip member integral with said axial extension and having an axially facing portion which in use functions as a seal when engaging a bearing part to prevent bearing lubricant from leaking into said seal assembly.
Claim 11
Dependent Claim
33 words
A seal assembly as claimed in claim 8, wherein said bellows comprises a peripheral portion molded on said tubular part of the casing and said peripheral portion is provided with a radial bead.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1986-04-18 | 1986-10-18 | 1987-04-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1990-04-18 | 1990-10-18 | 1991-04-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1994-04-18 | 1994-10-18 | 1995-04-19 | $7700.00 | Window Closed / Lapsed |