US3764236A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Modular pump
Assignee: JC CARTER COMPANY Inc A CORP OF
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Filing: 1971-07-15
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Granted: 1973-10-09
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Expires: 1991-07-15
Abstract
Abstract A modular multi-stage pump especially suited for pumping liquids whose external leakage may be hazardous such as liquified gases, including cryogenic fluids, which includes a fully submerged pump and motor unit preferably immersed in a suction pot and sealed with only two external static seals. The unit has a hydrostatic shaft bearing fed with pumpage that also cools the motor and flows back to the first stage discharge. The stages of the pump are in stacked relation and may be increased or decreased in number to develop a desired discharge pressure. The pump and motor unit is encased in a single sleeve casting with a plurality of longitudinal pockets spaced around the periphery thereof housing tubes carrying the pressurized fluids so that the casting is not subjected to the discharge pressure and can be very lightweight. The pump shaft extends through a hollow motor shaft and is keyed to the top end thereof, thereby eliminating a coupling.
Inventors
- 👤 J Carter
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 07:36
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/04; F04D29/046; F04D29/047; F04D1/00; F04D1/06; F04D13/00; F04D13/02; F04D13/06; F04D29/049; F04D29/40; F04D29/42; F04D29/44; F04D29/445; F04D29/448; F04D29/58; F04D29/5806; F04D29/586; F04D29/588; F04D7/00; F04D7/02; F04D9/00; Y; Y10; Y10S; Y10S415/00; Y10S415/901
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
309 words
A pump and motor unit which comprises an open end sleeve housing having an interior dividing wall providing a pump compartment and a motor compartment, localized longitudinally extending pockets spaced circumferentially around the motor compartment portion of the sleeve housing, end caps for the sleeve housing one of which provides an inlet throat to the bottom of the pump compartment and the other of which provides an outlet for pumpage, a motor in the motor compartment having a hollow motor shaft, radial bearings rotatably mounting said hollow motor shaft in the motor compartment, a pump shaft extending from the inlet through the pump compartment and through the hollow motor shaft, means suspending the pump shaft from the top of the hollow motor shaft, means coupling the pump shaft to the motor shaft, a plurality of impellers mounted on the pump shaft in the pump compartment in spaced superimposed relation, a plurality of stacked diffuser cups separating the pumping stages and having diffuser passages receiving the discharge from adjacent impellers, discharge tubes in at least one of said pockets receiving pumpage from the last pumping stage, passageways in the top cover receiving the pumpage from the discharge tubes and conveying the pumpage to the outlet, bleeder passageways between the last pumping stage and the motor compartment and between the last impeller and the hollow pump shaft for bleeding pumpage into the motor compartment to cool the bearings and the motor, one of said pockets having an overflow tube depending therefrom and communicating with the discharge from the first impeller for returning the coolant fluid back to the discharge side of the first stage so as to not relieve the fluid to inlet pressure, and means adapted to be raised by pressure in the last pumping stage for lifting the motor shaft to relieve thrust loads from the motor shaft bearings.
Claim 2
Dependent Claim
309 words
A pump and motor unit which comprises an open end sleeve housing having an interior dividing wall providing a pump compartment and a motor compartment, localized longitudinally extending pockets spaced circumferentially around the motor compartment portion of the sleeve housing, end caps for the sleeve housing one of which provides an inlet throat to the bottom of the pump compartment and the other of which provides an outlet for pumpage, a motor in the motor compartment having a hollow motor shaft, radial bearings rotatably mounting said hollow motor shaft in the motor compartment, a pump shaft extending from the inlet through the pump compartment and through the hollow motor shaft, means suspending the pump shaft from the top of the hollow motor shaft, means coupling the pump shaft to the motor shaft, a plurality of impellers mounted on the pump shaft in the pump compartment in spaced superimposed relation, a plurality of stacked diffuser cups separating the pumping stages and having diffuser passages receiving the discharge from adjacent impellers, discharge tubes in at least one of said pockets receiving pumpage from the last pumping stage, passageways in the top cover receiving the pumpage from the discharge tubes and conveying the pumpage to the outlet, bleeder passageways between the last pumping stage and the motor compartment and between the last impeller and the hollow pump shaft for bleeding pumpage into the motor compartment to cool the bearings and the motor, one of said pockets having an overflow tube depending therefrom and communicating with the discharge from the first impeller for returning the coolant fluid back to the discharge side of the first stage so as to not relieve the fluid to inlet pressure, and means adapted to be raised by pressure in the last pumping stage for lifting the motor shaft to relieve thrust loads from the motor shaft bearings.
Claim 3
Dependent Claim
24 words
The pump and motor unit of claim 1 wherein two discharge tubes are provided in side-by-side relation in at least one of said pockets.
Claim 4
Dependent Claim
43 words
The pump and motor unit of claim 1 wherein the overflow tube communicates with the passageway in the end cap having the inlet throat to discharge pumpage from the motor compartment back to the discharge from the first impeller in the pump compartment.
Claim 5
Dependent Claim
284 words
A pump and motor unit which comprises an open ended casing sleeve, end covers for the opposite ends of said sleeve, one of said end covers providing a central axial pump inlet, the other of said end covers providing a central axial pump outlet, a dividing wall in said sleeve separating the sleeve into a motor compartment and a pump compartment, circumferentially spaced localized pockets surrounding the motor compartment portion of the sleeve and extending from the pumping compartment to the end of the sleeve, at least one of said pockets having a discharge tube therein coMmunicating with a pumping compartment and with the end cover covering the motor compartment to direct pumpage to the central axial outlet of said cover, at least one of said pockets having a tube depending therefrom to the end cover having the pump inlet for circulation of cooling fluid back to the pumping compartment, an electric motor in said motor compartment having a hollow shaft, a shaft extending from the inlet in the end cover through the pumping compartment and through the hollow motor shaft, means coupling the ends of the motor and pump shafts for corotation, a plurality of impellers mounted on the pump shaft in the pump compartment, a plurality of stacked diffuser units in the pump compartment receiving discharge from an underlying impeller and directing the discharge to the next adjacent impeller, bearings carried by the diffuser units rotatably supporting the pump shaft in the pump compartment, an inducer impeller on the end of the pump shaft in the inlet provided by said end cover and means floated by pressure in the last pumping stage acting on the motor shaft to relieve thrust loads therefrom.
Claim 6
Dependent Claim
284 words
A pump and motor unit which comprises an open ended casing sleeve, end covers for the opposite ends of said sleeve, one of said end covers providing a central axial pump inlet, the other of said end covers providing a central axial pump outlet, a dividing wall in said sleeve separating the sleeve into a motor compartment and a pump compartment, circumferentially spaced localized pockets surrounding the motor compartment portion of the sleeve and extending from the pumping compartment to the end of the sleeve, at least one of said pockets having a discharge tube therein coMmunicating with a pumping compartment and with the end cover covering the motor compartment to direct pumpage to the central axial outlet of said cover, at least one of said pockets having a tube depending therefrom to the end cover having the pump inlet for circulation of cooling fluid back to the pumping compartment, an electric motor in said motor compartment having a hollow shaft, a shaft extending from the inlet in the end cover through the pumping compartment and through the hollow motor shaft, means coupling the ends of the motor and pump shafts for corotation, a plurality of impellers mounted on the pump shaft in the pump compartment, a plurality of stacked diffuser units in the pump compartment receiving discharge from an underlying impeller and directing the discharge to the next adjacent impeller, bearings carried by the diffuser units rotatably supporting the pump shaft in the pump compartment, an inducer impeller on the end of the pump shaft in the inlet provided by said end cover and means floated by pressure in the last pumping stage acting on the motor shaft to relieve thrust loads therefrom.
Claim 7
Dependent Claim
26 words
The pump and motor unit of claim 4 wherein the end cover with the pump outlet has a radial passage therein communicating with the discharge tube.
Claim 8
Dependent Claim
36 words
The pump and motor unit of claim 4 wherein the end cover with the pump outlet has a plurality of radial pump portions selectively drilled to provide passageways communicating with the discharge tubes in the pockets.
Claim 9
Dependent Claim
233 words
An electric motor driven pump unit which comprises a suction pot, a pump and motor casing sleeve in said pot having a top motor compartment and a bottom pumping compartment, a common lid sealing the top of the suction pot and top of the motor compartment of the sleeve providing an outlet for the pump, a bottom cover on the sleeve in the bottom of the suction pot providing a central axial inlet receiving fluid from the bottom of the pot, a motor in the motor compartment of the sleeve having a hollow shaft, a pump shaft depending from the hollow motor shaft through the pump compartment, a plurality of impellers keyed on the pump shaft in the pump compartment, an inducer keyed on the pump shaft in the inlet of the bottom cover, stacked diffuser units in the pump compartment separating the compartment into a plurality of pumping stages receiving discharge from an underlying impeller and directing the discharge to a superimposed impeller, tubes receiving the discharge from the top pumping stage and feeding the discharge to the common lid for flow to the outlet, another tube conveying coolant fluid from the motor compartment back to the discharge in the first stage of the pump and means operatively connected with said pump shaft acted on by fluid under pressure from said pumping compartment to raise the motor shaft to relieve thrust loads.
Claim 10
Dependent Claim
233 words
An electric motor driven pump unit which comprises a suction pot, a pump and motor casing sleeve in said pot having a top motor compartment and a bottom pumping compartment, a common lid sealing the top of the suction pot and top of the motor compartment of the sleeve providing an outlet for the pump, a bottom cover on the sleeve in the bottom of the suction pot providing a central axial inlet receiving fluid from the bottom of the pot, a motor in the motor compartment of the sleeve having a hollow shaft, a pump shaft depending from the hollow motor shaft through the pump compartment, a plurality of impellers keyed on the pump shaft in the pump compartment, an inducer keyed on the pump shaft in the inlet of the bottom cover, stacked diffuser units in the pump compartment separating the compartment into a plurality of pumping stages receiving discharge from an underlying impeller and directing the discharge to a superimposed impeller, tubes receiving the discharge from the top pumping stage and feeding the discharge to the common lid for flow to the outlet, another tube conveying coolant fluid from the motor compartment back to the discharge in the first stage of the pump and means operatively connected with said pump shaft acted on by fluid under pressure from said pumping compartment to raise the motor shaft to relieve thrust loads.
Claim 11
Dependent Claim
60 words
The unit of claim 7 including a plurality of impellers in the pump compartment, a plurality of stacked diffuser units surrounding the impellers for receiving pumpage from an underlying impeller and directing the same to the eye of an overlying impeller, and said diffuser units being selectively increased or decreased in number to vary the discharge pressure of the pump.
Claim 12
Dependent Claim
177 words
An electric motor driven pump unit which comprises a casing sleeve providing a top motor compartment with a motor therein and a bottom motor compartment with pumping means therein and an inlet to said pumping means, a shaft coupling said motor and pumping means, a plurality of circumferentially spaced elongated pockets surrounding the motor compartment portion of the sleeve and extending longitudinally along the length thereof, tube means in said pockets for conveying pumpage from the pump compartment to the top of the sleeve, additional tube means depending from one of said pockets on the outside of said pump compartment to communicate pumpage from the motor compartment back to the pump compartment, means operatively connected with said shaft acted on by fluid from said pumping means to raIse the shaft for relieving thrust loads, a bleeder passage for pumpage from the top of the pump compartment to the bottom of the motor compartment, and a return passage from the motor compartment back to the bottom of the pump compartment downstream from the inlet to the pump compartment.
Claim 13
Dependent Claim
177 words
An electric motor driven pump unit which comprises a casing sleeve providing a top motor compartment with a motor therein and a bottom motor compartment with pumping means therein and an inlet to said pumping means, a shaft coupling said motor and pumping means, a plurality of circumferentially spaced elongated pockets surrounding the motor compartment portion of the sleeve and extending longitudinally along the length thereof, tube means in said pockets for conveying pumpage from the pump compartment to the top of the sleeve, additional tube means depending from one of said pockets on the outside of said pump compartment to communicate pumpage from the motor compartment back to the pump compartment, means operatively connected with said shaft acted on by fluid from said pumping means to raIse the shaft for relieving thrust loads, a bleeder passage for pumpage from the top of the pump compartment to the bottom of the motor compartment, and a return passage from the motor compartment back to the bottom of the pump compartment downstream from the inlet to the pump compartment.
Claim 14
Dependent Claim
189 words
An electric motor driven pump unit which comprises a casing sleeve providing a top motor compartment with a motor therein and a bottom motor compartment with pumping means therein and an inlet to said pumping means, a shaft coupling said motor and pumping means, a plurality of circumferentially spaced elongated pockets surrounding the motor compartment portion of the sleeve and extending longitudinally along the length thereof, tube means in said pockets for conveying pumpage from the pump compartment to the top of the sleeve, additional tube means depending from one of said pockets on the outside of said pump compartment to communicate pumpage from the motor compartment back to the pump compartment, means operatively connected with said shaft acted on by fluid from said pumping means to raise the shaft for relieving thrust loads, said motor in the motor compartment having a hollow motor shaft, radial bearings supporting the shaft in the motor compartment, a solid pump shaft suspended from the top of the motor shaft, impellers on the pump shaft in the pump compartment, and means for bleeding pumpage from the pump compartment through the hollow motor shaft.
Claim 15
Dependent Claim
189 words
An electric motor driven pump unit which comprises a casing sleeve providing a top motor compartment with a motor therein and a bottom motor compartment with pumping means therein and an inlet to said pumping means, a shaft coupling said motor and pumping means, a plurality of circumferentially spaced elongated pockets surrounding the motor compartment portion of the sleeve and extending longitudinally along the length thereof, tube means in said pockets for conveying pumpage from the pump compartment to the top of the sleeve, additional tube means depending from one of said pockets on the outside of said pump compartment to communicate pumpage from the motor compartment back to the pump compartment, means operatively connected with said shaft acted on by fluid from said pumping means to raise the shaft for relieving thrust loads, said motor in the motor compartment having a hollow motor shaft, radial bearings supporting the shaft in the motor compartment, a solid pump shaft suspended from the top of the motor shaft, impellers on the pump shaft in the pump compartment, and means for bleeding pumpage from the pump compartment through the hollow motor 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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |