Patent US3841786A successfully refreshed from Google Patents.
US3841786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and cooling system for cooling centrifugal pumps
Assignee: Sulzer AG
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Filing: 1971-06-28
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Granted: 1974-10-15
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Expires: 1991-06-28
Abstract
Abstract The pump zone exposed to the risk of vapor bubble formation is cooled to eliminate or substantially reduce the risk. The cooling is accomplished in some embodiments by cooling the surfaces of the impeller blades from within or without, or in some other embodiments by cooling the medium being conveyed through the zone.
Inventors
- 👤 D Florjancic
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 05:58
CPC Classifications
G; G21; G21C; G21C15/00; G21C15/24; G21C15/243; F; F04; F04D; F04D29/00; F04D29/18; F04D29/22; F04D29/24; F04D29/58; F04D29/586; F04D29/588; F04D29/66; F04D29/669; F04D3/00; F04D3/005; F04D9/00; F22; F22D; F22D11/00; F22D11/02; Y; Y02; Y02E; Y02E30/00; Y02E30/30
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
200 words
A centrifugal pump for the conveyance of hot fluids wherein the formation of vapor bubbles in the hot fluids is avoided, said pump comprising a casing for flow of a fluid therethrough; a suction branch adjoining said casing; an internal casing part defining a central inlet; a drive shaft journalled in said casing and within said casing part on a longitudinal axis; at least one radial flow impeller mounted on said drive shaft, said impeller having at least one blade extending radially of said shaft and transversely of the fluid flow, said blade having a forward flow impinging edge and surfaces within a pump zone adjacent said blade in which vapor bubbles formation can raise, said edge extending at an angle to said axis of rotation; and a cooling system for cooling said zone, said system including at least one bore extending through said blade, a plurality of discharge ducts diSposed in said blade in communication with said bore and extending to the surface of said forward flow impinging edge, and means for supplying coolant to said bore and said ducts to discharge the coolant out of said blade over said blade surface in a fluid film into said zone.
Claim 2
Dependent Claim
200 words
A centrifugal pump for the conveyance of hot fluids wherein the formation of vapor bubbles in the hot fluids is avoided, said pump comprising a casing for flow of a fluid therethrough; a suction branch adjoining said casing; an internal casing part defining a central inlet; a drive shaft journalled in said casing and within said casing part on a longitudinal axis; at least one radial flow impeller mounted on said drive shaft, said impeller having at least one blade extending radially of said shaft and transversely of the fluid flow, said blade having a forward flow impinging edge and surfaces within a pump zone adjacent said blade in which vapor bubbles formation can raise, said edge extending at an angle to said axis of rotation; and a cooling system for cooling said zone, said system including at least one bore extending through said blade, a plurality of discharge ducts diSposed in said blade in communication with said bore and extending to the surface of said forward flow impinging edge, and means for supplying coolant to said bore and said ducts to discharge the coolant out of said blade over said blade surface in a fluid film into said zone.
Claim 3
Dependent Claim
31 words
A centrifugal pump as set forth in claim 1 wherein said blade includes a porous material portion communicating with said duct and wherein said discharge ducts are formed in said portion.
Claim 4
Dependent Claim
183 words
A centrifugal pump for the conveyance of hot fluids having an improved suction performance wherein formation of vapor bubbles is avoided, said pump comprising a casing defining a central inlet for flow of a hot fluid therethrough; a drive shaft journalled in said casing and having bores extending therethrough; at least one impeller mounted on said drive shaft, said impeller having at least one radial pumping blade extending therefrom within a pump zone adjacent said blade in which vapor bubble formation can arise, said blade having a forward flow inclined leading impinging edge and surfaces adjacent said pump zone; and a cooling system for cooling said zone, said system including a plurality of ducts disposed in said blade at said forward flow inclined leading impinging edge, means connected to at least one of said bores in said shaft for supplying a coolant to said ducts to cool said blade surfaces in said zone, and means connected to said ducts for receiving the coolant from said blade and for discharging the received coolant into at least one other of said bores of said shaft.
Claim 5
Dependent Claim
183 words
A centrifugal pump for the conveyance of hot fluids having an improved suction performance wherein formation of vapor bubbles is avoided, said pump comprising a casing defining a central inlet for flow of a hot fluid therethrough; a drive shaft journalled in said casing and having bores extending therethrough; at least one impeller mounted on said drive shaft, said impeller having at least one radial pumping blade extending therefrom within a pump zone adjacent said blade in which vapor bubble formation can arise, said blade having a forward flow inclined leading impinging edge and surfaces adjacent said pump zone; and a cooling system for cooling said zone, said system including a plurality of ducts disposed in said blade at said forward flow inclined leading impinging edge, means connected to at least one of said bores in said shaft for supplying a coolant to said ducts to cool said blade surfaces in said zone, and means connected to said ducts for receiving the coolant from said blade and for discharging the received coolant into at least one other of said bores of said shaft.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |