US3947709A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Protector for submersible electric motors
Assignee: Ethyl Corp
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Filing: 1974-06-20
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Granted: 1976-03-30
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Expires: 1994-06-20
Abstract
Abstract A protector for liquid-filled, submersible electric motors is provided. The protector has a resiliently deformable, liquid-filled reservoir which is attached to the housing of the electric motor. The motor liquid and the reservoir liquid are communicated at the attachment. The protector compensates for volume changes of the motor liquid, due to heating or cooling thereof, by expansion or contraction of the deformable reservoir. By compensating for motor liquid volume changes, internal motor parts are protected and isolated from external fluids.
Inventors
- 👤 Robert E. Waltman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-27 07:51
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/132
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
152 words
An apparatus for protecting, from corrosive fluids, submersible electric motors which are filled with lubricating liquid which includes: a. a reservoir shield means being filled with a reservoir shield liquid and having an upper end and a lower end, said upper end being permanently sealed to prevent reservoir shield liquid leakage from said upper end and said lower end being temporarily sealed to prevent reservoir shield liquid leakage from said lower end prior to insertion of said shield means in said corrosive fluids, said temporary seal being a destructible plug which will destruct when said insertion occurs so that said reservoir liquid and said corrosive fluids will be communicative one with the other; b. a liquid-filled, resiliently deformable reservoir means within said reservoir shield means; and c. an attaching means for attaching said reservoir means to said electric motor housing and for achieving communication between said reservoir liquid and said lubricating liquid.
Claim 2
Independent Claim
152 words
An apparatus for protecting, from corrosive fluids, submersible electric motors which are filled with lubricating liquid which includes: a. a reservoir shield means being filled with a reservoir shield liquid and having an upper end and a lower end, said upper end being permanently sealed to prevent reservoir shield liquid leakage from said upper end and said lower end being temporarily sealed to prevent reservoir shield liquid leakage from said lower end prior to insertion of said shield means in said corrosive fluids, said temporary seal being a destructible plug which will destruct when said insertion occurs so that said reservoir liquid and said corrosive fluids will be communicative one with the other; b. a liquid-filled, resiliently deformable reservoir means within said reservoir shield means; and c. an attaching means for attaching said reservoir means to said electric motor housing and for achieving communication between said reservoir liquid and said lubricating liquid.
Claim 3
Dependent Claim
12 words
The apparatus of claim 1 wherein said reservoir means is a bellows.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1 wherein said reservoir means is a cylindrical bellows.
Claim 5
Dependent Claim
22 words
The apparatus of claim 3 wherein said reservoir shield means is a hollow cylinder within which said cylindrical bellows is centrally positioned.
Claim 6
Dependent Claim
21 words
The apparatus of claim 2 wherein said destructible plug is a fusible metal which melts at a temperature above about 100°C.
Claim 7
Dependent Claim
16 words
The apparatus of claim 1 wherein said lubricating liquid and said reservoir liquid are hydrocarbon oil.
Claim 8
Dependent Claim
21 words
The apparatus of claim 1 wherein said destructible plug is a fusible metal which melts at a temperature above about 100°F.
Claim 9
Dependent Claim
13 words
The apparatus of claim 1 wherein said reservoir means is a metal bellows.
Claim 10
Dependent Claim
13 words
The apparatus of claim 8 wherein said metal bellows is made of Monel.
Claim 11
Dependent Claim
14 words
The apparatus of claim 8 wherein said metal bellows is a cylindrical metal bellows.
Claim 12
Independent Claim
23 words
The apparatus of claim 1o wherein said reservoir shield means is a hollow cylinder within which said cylindrical metal bellows is centrally positioned.
Claim 13
Dependent Claim
21 words
The apparatus of claim 11 wherein said destructible plug is a fusible metal which melts at a temperature above about 100°F.
Claim 14
Dependent Claim
45 words
The apparatus of claim 11 wherein said cylindrical metal bellows has attached to the outer surface thereof spaced apart, radially extending bellows guides which slidably contact said hollow cylinder whereby said cylindrical metal bellows is maintained in axial alignment within said hollow cylinder shield means.
Claim 15
Dependent Claim
21 words
The apparatus of claim 13 wherein said destructible plug is a fusible metal which melts at a temperature above about 100°F.
Claim 16
Dependent Claim
16 words
The apparatus of claim 14 wherein said lubricating liquid and said reservoir liquid are hydrocarbon oil.
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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) | 1979-03-30 | 1979-09-29 | 1980-03-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1983-03-30 | 1983-09-29 | 1984-03-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1987-03-30 | 1987-09-29 | 1988-03-30 | $7700.00 | Window Closed / Lapsed |