US3746472A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Submersible electric pump having fluid pressure protective means
Assignee: RUPP CO WARREN
•
Filing: 1971-08-06
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Granted: 1973-07-17
•
Expires: 1991-08-06
Abstract
Abstract A submersible electric motor driven pump having a motor chamber and a pump chamber separated by a seal chamber. A shaft seal is immersed in oil in the seal chamber and prevents the flow of liquid from the pump chamber into the motor chamber. The motor chamber is filled with gas under pressure which aids in sealing it. The gas is introduced to a pressure operated switch and a pressure gauge, which may be located above the surface of the liquid in which the pump is submerged. The pressure operated switch is connected in circuit with the power controls to the motor and is held closed by a predetermined minimum pressure of gas in the motor chamber. In case of a pressure loss from a shaft seal failure the switch is automatically opened and power to the motor is interrupted thus preventing pumped liquid from entering the motor chamber while the motor is energized.
Inventors
- 👤 W Rupp
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 20:29
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/132; F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/08; F04D13/086; F04D15/00; F04D15/02; F04D15/0245; F04D15/0263; F04D29/00; F04D29/08; F04D29/10; F04D29/12; F04D29/126; F04D29/128; H02K11/00; H02K11/20; Y; Y10; Y10S; Y10S277/00; Y10S277/914
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
151 words
In combination, a submersible motor and pump assembly and controlled gas sealing means therefor, said assembly comprising housing means defining a chamber for said motor and a chamber for said pump, a shaft for said motor extending into said pump chamber and being drivingly connected to said pump, and shaft sealing means between said chambers for preventing passage of liquid into said motor chamber, said controlled sealing means comprising a gas within said motor chamber exerting a pressure greater than the pressure exterior to said motor chamber, the pressure of said gas acting upon said shaft sealing means to aid in preventing entry of liquid into said motor chamber, and control means responsive to the pressure of gas within said motor chamber for enabling said assembly to operate when said pressure exceeds a predetermined pressure and for preventing operation of said assembly when said pressure is less than said predetermined pressure.
Claim 2
Dependent Claim
151 words
In combination, a submersible motor and pump assembly and controlled gas sealing means therefor, said assembly comprising housing means defining a chamber for said motor and a chamber for said pump, a shaft for said motor extending into said pump chamber and being drivingly connected to said pump, and shaft sealing means between said chambers for preventing passage of liquid into said motor chamber, said controlled sealing means comprising a gas within said motor chamber exerting a pressure greater than the pressure exterior to said motor chamber, the pressure of said gas acting upon said shaft sealing means to aid in preventing entry of liquid into said motor chamber, and control means responsive to the pressure of gas within said motor chamber for enabling said assembly to operate when said pressure exceeds a predetermined pressure and for preventing operation of said assembly when said pressure is less than said predetermined pressure.
Claim 3
Dependent Claim
75 words
The combination as claimed in claim 1 further comprising an oil filled seal chamber between said motor chamber and said pump chamber and containing said shaft sealing means, and wherein said shaft sealing means includes a lip-type oil seal arranged to prevent passage of oil from said seal chamber to said motor chamber and to permit passage of gas from said motor chamber to said seal chamber whereby gas pressure is exerted on said oil.
Claim 4
Dependent Claim
103 words
The combination as claimed in claim 2 wherein said shaft sealing means includes a face-type shaft seal immersed in said oil and preventing leakage thereof into said pump chamber, the pressure of said gas acting upon said oil and aiding said face-type seal, said face-type seal including a stationary seal member and a rotating seal member having a face in said seal chamber and a radially outer face in said pump chamber, said rotating seal member transmitting centrifugal force into said pump chamber during rotation to maintain the area of said seal free from particles entrained in the liquid in said pump chamber.
Claim 5
Dependent Claim
13 words
The combination as claimed in claim 1 wherein said gas is nitrogen gas.
Claim 6
Dependent Claim
82 words
The combination as claimed in claim 1 wherein said motor is an electrical motor and said control means includes means for supplying electrical power to said motor and pressure actuated switch means connected in circuit with said power supplying means and responsive to pressure within said motor chamber for enabling power to be supplied to said motor when said pressure exceeds a predetermined pressure and for causing interruption of power to said motor when said pressure is less than said predetermined pressure.
Claim 7
Dependent Claim
50 words
The combination as claimed in claim 5 wherein said switch means is located external to said motor and pump assembly and including means for transmitting the pressure of gas thereto and a pressure gauge connected to said pressure transmitting means for monitoring the pressure of gas within said motor chamber.
Claim 8
Dependent Claim
196 words
In combination, a submersible electrical motor and pump assembly and controlled gas sealing means therefor, said assembly comprising housing means defining a chamber for said motor, a chamber for said pump and a seal chamber therebetween, a shaft for said motor extending through said seal chamber and into said pump chamber and being drivingly connected to said pump, shaft sealing means immersed in oil in said seal chamber and preventing leakage along said shaft between said pump chamber and said seal chamber, said controlled gas sealing means comprising a gas within said motor chamber exertiNg a pressure greater than the pressure in said pump chamber, the pressure of said gas acting on said oil in said seal chamber and being transmitted thereby to said shaft sealing means to aid in sealing said shaft, means for supplying electrical power to said motor, and pressure actuated switch means connected in circuit with said power supplying means and responsive to pressure within said motor chamber for enabling power to be supplied to said motor when said pressure exceeds a predetermined pressure and for causing interruption of power to said motor when said pressure is less than said predetermined pressure.
Claim 9
Dependent Claim
196 words
In combination, a submersible electrical motor and pump assembly and controlled gas sealing means therefor, said assembly comprising housing means defining a chamber for said motor, a chamber for said pump and a seal chamber therebetween, a shaft for said motor extending through said seal chamber and into said pump chamber and being drivingly connected to said pump, shaft sealing means immersed in oil in said seal chamber and preventing leakage along said shaft between said pump chamber and said seal chamber, said controlled gas sealing means comprising a gas within said motor chamber exertiNg a pressure greater than the pressure in said pump chamber, the pressure of said gas acting on said oil in said seal chamber and being transmitted thereby to said shaft sealing means to aid in sealing said shaft, means for supplying electrical power to said motor, and pressure actuated switch means connected in circuit with said power supplying means and responsive to pressure within said motor chamber for enabling power to be supplied to said motor when said pressure exceeds a predetermined pressure and for causing interruption of power to said motor when said pressure is less than said predetermined pressure.
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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) | 1976-07-16 | 1977-01-15 | 1977-07-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-07-16 | 1981-01-15 | 1981-07-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-07-16 | 1985-01-15 | 1985-07-17 | $7700.00 | Window Closed / Lapsed |