US4242039A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump impeller seals with spiral grooves
Assignee: LAir Liquide SA pour lEtude et lExploitation des Procedes Georges Claude
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Filing: 1978-11-15
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Granted: 1980-12-30
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Expires: 1998-11-15
Abstract
Abstract The present invention relates to internal and shaft outlet seals of a pump. On both sides of a paddle-wheel are arranged a pair of coaxial discs (22-23) and (24-25), the face of one disc being smooth and the face of the other disc having spiral grooves, one of the discs of each pair being interlocked in rotation with wheel 5, whereby the liquid between two discs is subjected to a pressure increase radially outwardly compensating at least for the pressure increase due to pumping by wheel 5.
Inventors
- 👤 Jean-Claude Villard
- 👤 Gilbert Berthereau
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-26 18:04
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/165; F04D29/167; F04D29/18; F04D29/22; F04D29/2261; F04D29/2266
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
164 words
A pump comprising a housing having an axial inlet and a peripheral outlet, an axial drive shaft rotatable in the housing, a paddle wheel impeller on the drive shaft having a plurality of outwardly extending passageways for the receipt of liquid from said inlet and the discharge of liquid to said outlet upon rotation of the drive shaft and impeller, and a hydrodynamic seal on each axial side of the impeller, each seal comprising a pair of confronting discs disposed peripendicular to the axis of the pump, one disc of each pair being fixed against rotation relative to the housing and the other disc of each pair being mounted for rotation on the impeller, one of said discs of each pair having spiral grooves thereon, and a bellows fixed to the housing and surrounding said inlet, one of said fixed discs being carried by said bellows, said impeller being mounted on said drive shaft for limited axial sliding movement relative to the drive shaft.
Claim 2
Dependent Claim
164 words
A pump comprising a housing having an axial inlet and a peripheral outlet, an axial drive shaft rotatable in the housing, a paddle wheel impeller on the drive shaft having a plurality of outwardly extending passageways for the receipt of liquid from said inlet and the discharge of liquid to said outlet upon rotation of the drive shaft and impeller, and a hydrodynamic seal on each axial side of the impeller, each seal comprising a pair of confronting discs disposed peripendicular to the axis of the pump, one disc of each pair being fixed against rotation relative to the housing and the other disc of each pair being mounted for rotation on the impeller, one of said discs of each pair having spiral grooves thereon, and a bellows fixed to the housing and surrounding said inlet, one of said fixed discs being carried by said bellows, said impeller being mounted on said drive shaft for limited axial sliding movement relative to the drive shaft.
Claim 3
Dependent Claim
24 words
A pump as claimed in claim 1, the last-named disc being secured to the bellows by the radially inner periphery of the last-named disc.
Claim 4
Dependent Claim
18 words
A pump as claimed in claim 1, the other disc of each said pair of discs being smooth.
Claim 5
Dependent Claim
36 words
A pump as claimed in claim 3, in which the spirally grooved disc of each said pair has a further smooth radial part adapted to come into contact with a facing part of the smooth disc.
Claim 6
Dependent Claim
31 words
A pump as claimed in claim 4, in which said smooth part of the spirally grooved disc is situated closer to the shaft than the spirally grooved part of the disc.
Claim 7
Dependent Claim
34 words
A pump as claimed in claim 4, in which the smooth part of the spiral disc is situated at a greater radial distance from the shaft than the spirally grooved part of the disc.
Claim 8
Dependent Claim
29 words
A pump as claimed in claim 3, in which the smooth disc is on the impeller and the spirally grooved disc is fixed against rotation relative to the housing.
Claim 9
Dependent Claim
49 words
A pump as claimed in claim 1, in which one disc of each pair of discs has an annular groove therein, means for connecting said annular groove to a source of gas under pressure, and labyrinthine sealing grooves in said annularly grooved disc radially inwardly of said annular groove.
Claim 10
Dependent Claim
38 words
A pump as claimed in claim 1, and a perforation extending through a radially inner portion of the impeller between at least one of said passages and the side of the impeller that is axially opposite said inlet.
References Cited (Backward Citations)
SU182519A1
Cited
DE708593C
Cited
US3137237A
Cited
FR1505487A
Cited
US3467449A
Cited
US3578874A
Cited
US3535051A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-12-30 | 1984-06-30 | 1984-12-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-12-30 | 1988-06-30 | 1988-12-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-12-30 | 1992-06-30 | 1992-12-30 | $7700.00 | Window Closed / Lapsed |