Patent US3779667A successfully refreshed from Google Patents.
US3779667A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Semi-seal device
Assignee: BAKER-HYDRO INCORPORATED A CORP OF
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Filing: 1972-02-24
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Granted: 1973-12-18
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Expires: 1992-02-24
Abstract
Abstract A semi-seal device for controlling the flow of water along a rotating shaft, which device is annular and contained in a retainer disposed around the shaft. The containment is loose so that the semi-sealing member may move laterally in its retainer thus temporarily increasing the clearance between the semisealing member and the rotating shaft. In addition, the semisealing member is deformable and resilient. The lateral movement and deformation properties allow sand or other foreign particles to pass between the semi-sealing member and rotating shaft.
Inventors
- 👤 C Johnson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 13:14
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/165; F04D29/167; F16; F16J; F16J15/00; F16J15/44; F16J15/447; F16J15/4472; F16J15/4474
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
242 words
A centrifugal water pump including a semi-seal comprising: a housing; a pump impellor mounted for rotation within said housing and having a circular hub thereon; a chamber defined between said impellor and said housing and in fluid communication with the interior of said impellor through the intake and discharge of the impellor; an annular semi-sealing member having a slightly large interior diameter than the exterior diameter of said hub and disposed in said chamber in closely-spaced position around said hub for allowing limited flow of water through said chamber through the space defined between inner diameter of the annular semisealing member and the hub; said pump impellor creating a pressure differential in said chamber between opposite axial sides of said semi-sealing member; and retaining means on said housing having a recess therein with walls retaining said semi-sealing member in its axial position relative to said hub, said recess being of greater axial length than the axial thickness of said semi-sealing member and of an outer diameter greater than the outer diameter of said semisealing member for permitting said semi-sealing member to move laterally relative to said hub to an eccentric position therewith to permit paRticles in said water larger in dimension than the difference in radius between the exterior of said hub and the interior of said semi-sealing member to pass between the semi-sealing member and the hub in response to the differential pressure between the intake and discharge of the impellor.
Claim 2
Dependent Claim
242 words
A centrifugal water pump including a semi-seal comprising: a housing; a pump impellor mounted for rotation within said housing and having a circular hub thereon; a chamber defined between said impellor and said housing and in fluid communication with the interior of said impellor through the intake and discharge of the impellor; an annular semi-sealing member having a slightly large interior diameter than the exterior diameter of said hub and disposed in said chamber in closely-spaced position around said hub for allowing limited flow of water through said chamber through the space defined between inner diameter of the annular semisealing member and the hub; said pump impellor creating a pressure differential in said chamber between opposite axial sides of said semi-sealing member; and retaining means on said housing having a recess therein with walls retaining said semi-sealing member in its axial position relative to said hub, said recess being of greater axial length than the axial thickness of said semi-sealing member and of an outer diameter greater than the outer diameter of said semisealing member for permitting said semi-sealing member to move laterally relative to said hub to an eccentric position therewith to permit paRticles in said water larger in dimension than the difference in radius between the exterior of said hub and the interior of said semi-sealing member to pass between the semi-sealing member and the hub in response to the differential pressure between the intake and discharge of the impellor.
Claim 3
Dependent Claim
36 words
A centrifugal water pump including a semi-seal as defined in claim 1 and further comprising a second one of said chambers, said semi-sealing members, and said retaining means disposed on the opposite side of said impellor.
Claim 4
Dependent Claim
36 words
A centrifugal water pump including a semi-seal as defined in claim 2 in which the axis of rotation is substantially vertical, the first chamber is above the impellor, and the second chamber is below the impellor.
Claim 5
Dependent Claim
26 words
A centrifugal water pump including a semi-seal as defined in claim 1 wherein the water flowing through the chamber is used to cool the impellor shaft.
Claim 6
Dependent Claim
58 words
A centrifugal water pump including a semi-seal as defined in claim 1 wherein: said housing includes an assembly disposed around said hub in spaced relation thereto and having a first member and a second member in juxtaposed relation forming an annular recess for receipt of said semi-sealing member; and said retaining means is mounted on said housing assembly.
Claim 7
Dependent Claim
86 words
A centrifugal water pump including a semi-seal as defined in claim 1 wherein said retaining means comprises: first and second annular members removably connected together, one of said annular members having a retaining shoulder forming a recess in said connection between said first and second annular members, said recess containing the semi-sealing member, the largest diameter of said recess being substantially greater than the largest diameter of said semi-sealing member, and the height of said recess being slightly greater than the height of said semi-sealing member.
Claim 8
Dependent Claim
41 words
A centrifugal water pump including a semi-seal as defined in claim 6 and further comprising: pins on one of said annular retaining means members and holes in the other of said annular retaining means members for aligning the two retaining members.
Claim 9
Dependent Claim
41 words
A centrifugal water pump including a semi-seal as defined in claim 1, wherein said semi-sealing member is a resilient ring adapted to be deformed by the passing of the particles to promote movement of said semi-sealing member to said eccentric position.
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) | 1976-12-17 | 1977-06-18 | 1977-12-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-12-17 | 1981-06-18 | 1981-12-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-12-17 | 1985-06-18 | 1985-12-18 | $7700.00 | Window Closed / Lapsed |