Patent US4909707A successfully refreshed from Google Patents.
US4909707A
Expired / Lapsed
US
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Centrifugal pump and floating casing ring therefor
Assignee: ITT Inc
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Filing: 1989-02-14
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Granted: 1990-03-20
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Expires: 2009-02-14
Abstract
Abstract A centrifugal pump has a floating casing ring which is deflectable in response to contact by an impeller of the pump.
Inventors
- 👤 Kenneth R. Wauligman
- 👤 Reinhold B. Erickson
- 👤 James H. Ball
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 23:16
CPC Classifications
F; F16; F16C; F16C27/00; F16C27/06; F16C27/063; F04; F04D; F04D29/00; F04D29/08; F04D29/16; F04D29/165; F04D29/167; F16J; F16J15/00; F16J15/16; F16J15/32; F16J15/3268; F16J15/3276; F16J15/44; F16J15/441; F16C2240/00; F16C2240/40; F16C2240/46; F16C2360/00; F16C2360/44; Y; Y10; Y10S; Y10S384/00; Y10S384/90; Y10S384/901
Claims Analysis
Total Claims: 21
Claim 1
Independent Claim
96 words
In a casing ring for a centrifugal pump, which pump normally includes a casing to which the casing ring is mounted and an impeller rotatably mounted within the casing such that the casing ring is positioned between the impeller and the casing, the improvement wherein the casing ring is deflectable in response to contact by the impeller, whereby wear on the casing ring is reduced; and wherein a first radial clearance exists between the casing and the casing ring, the first radial clearance being in a range of from about 0.050 inches to about 0.051 inches.
Claim 2
Dependent Claim
96 words
In a casing ring for a centrifugal pump, which pump normally includes a casing to which the casing ring is mounted and an impeller rotatably mounted within the casing such that the casing ring is positioned between the impeller and the casing, the improvement wherein the casing ring is deflectable in response to contact by the impeller, whereby wear on the casing ring is reduced; and wherein a first radial clearance exists between the casing and the casing ring, the first radial clearance being in a range of from about 0.050 inches to about 0.051 inches.
Claim 3
Dependent Claim
30 words
An improved casing ring according to claim 1, wherein the casing ring includes sealing means for sealing the first radial clearance so as to prevent the flow of fluid therethrough.
Claim 4
Dependent Claim
29 words
An improved casing ring according to claim 2, wherein said sealing means includes a pair of O-rings, each O-ring being made from a resilient material having an elastic memory.
Claim 5
Dependent Claim
19 words
An improved casing ring according to claim 3, wherein the O-rings urge the casing ring into an undeflected position.
Claim 6
Dependent Claim
37 words
An improved casing ring according to claim 1, wherein a second radial clearance exists between the impeller and the casing ring, the second radial clearance remaining substantially constant due to the reduced wear on the casing ring.
Claim 7
Dependent Claim
26 words
An improved casing ring according to claim 5, wherein the second radial clearance is in a range of from about 0.005 inches to about 0.006 inches.
Claim 8
Dependent Claim
77 words
A centrifugal pump, comprising a casing, an impeller rotatably mounted within the casing, and a floating casing ring attached to the casing between the casing and the impeller; said casing ring being deflectable in response to contact by the impeller, whereby wear on the casing ring is reduced; and a first radial clearance between the casing and the casing ring, the first radial clearance being in a range of from about 0.050 inches to about 0.051 inches.
Claim 9
Dependent Claim
77 words
A centrifugal pump, comprising a casing, an impeller rotatably mounted within the casing, and a floating casing ring attached to the casing between the casing and the impeller; said casing ring being deflectable in response to contact by the impeller, whereby wear on the casing ring is reduced; and a first radial clearance between the casing and the casing ring, the first radial clearance being in a range of from about 0.050 inches to about 0.051 inches.
Claim 10
Dependent Claim
28 words
A centrifugal pump according to claim 7, wherein the casing ring includes sealing means for sealing the first radial clearance so as to prevent the flow of fluid
Claim 11
Dependent Claim
28 words
A centrifugal pump according to claim 8, wherein said sealing means includes a pair of O-rings, each O-ring being made from a resilient material having an elastic memory.
Claim 12
Dependent Claim
18 words
A centrifugal pump according to claim 9, wherein the O-rings urge the casing ring into an undeflected position.
Claim 13
Dependent Claim
36 words
A centrifugal pump according to claim 7, wherein a second radial clearance exists between the impeller and the casing ring, the second radial clearance remaining substantially constant due to the reduced wear on the casing ring.
Claim 14
Dependent Claim
25 words
A centrifugal pump according to claim 11, wherein the second radial clearance is in a range of from about 0.005 inches to about 0.006 inches.
Claim 15
Independent Claim
99 words
A method of reducing the wear on a casing ring of a centrifugal pump, which pump normally includes a casing to which the casing ring is mounted and an impeller rotatably mounted within the casing such that the casing ring is positioned between the impeller and the casing, said method comprising the steps of mounting the casing ring such that it is deflectable in response to contact by the impeller; and providing first radial clearance between the casing and the casing ring, the first radial clearance being in a range of from about 0.050 inches to about 0.051 inches.
Claim 16
Independent Claim
99 words
A method of reducing the wear on a casing ring of a centrifugal pump, which pump normally includes a casing to which the casing ring is mounted and an impeller rotatably mounted within the casing such that the casing ring is positioned between the impeller and the casing, said method comprising the steps of mounting the casing ring such that it is deflectable in response to contact by the impeller; and providing first radial clearance between the casing and the casing ring, the first radial clearance being in a range of from about 0.050 inches to about 0.051 inches.
Claim 17
Dependent Claim
25 words
A method according to claim 13, further comprising the step to sealing the first radial clearance so as to prevent the flow of fluid therethrough.
Claim 18
Dependent Claim
30 words
A method according to claim 14, wherein the first radial clearance is sealed by a pair of O-rings, each O-ring being made from a resilient material having an elastic memory.
Claim 19
Dependent Claim
17 words
A method according to claim 15, wherein the O-rings urge the casing ring into an undeflected position.
Claim 20
Dependent Claim
35 words
A method according to claim 13, wherein a second radial clearance exists between the impeller and the casing ring, the second radial clearance remaining substantially constant due to the reduced wear on the casing ring.
Claim 21
Dependent Claim
24 words
A method according to claim 17, wherein the second radial clearance is in a range of from about 0.005 inches to about 0.006 inches.
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) | 1993-03-19 | 1993-09-18 | 1994-03-20 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-03-19 | 1997-09-18 | 1998-03-20 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-03-19 | 2001-09-18 | 2002-03-20 | $7700.00 | Window Closed / Lapsed |