EP0043162A1
Expired / Lapsed
EP
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Improvements in electrically powered, submersible centrifugal pumps
Assignee: IMO AB
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Filing: 1981-06-23
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Granted: —
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Expires: 2001-06-23
Abstract
Abstract A submersible pump which may be provided in a cargo tank of an oil tanker or the like, comprising an electric driving motor (1) which is surrounded by a cooling jacket (9). To isolate the motor (1) from the cargo oil or liquid, the motor (1) including its cooling jacket (9) is enclosed in a coffer-dam (18) which is suitably filled with water and through which extends at least a substantial portion of an electric current supply cable (20) for the motor.
Inventors
- 👤 Karl Gunnar Ekman
Bibliographic Details
Application Number
—
Jurisdiction
EP
Data Source
google_patents
Last Synchronized
2026-11-08 06:25
CPC Classifications
F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/08; F04D13/086; F04D29/00; F04D29/40; F04D29/406; F04D29/58; F04D29/5806; F04D29/586; F04D29/5893; H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/136
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
75 words
1) Improvements in electrically powered, submersible centrifugal pumps whose electric motor (1) is enclosed in a cooling jacket (9) which surrounds the motor and has an inner jacket wall (8) and a tight outer jacket wall (10), characterized in that the electric motor (1) and its cooling jacket (9) are both surrounded by a common, preferably water-filled coffer-dam (18) which is completely isolated from the cooling jacket (9) by the tight, outer jacket wall (10).
Claim 2
Dependent Claim
75 words
1) Improvements in electrically powered, submersible centrifugal pumps whose electric motor (1) is enclosed in a cooling jacket (9) which surrounds the motor and has an inner jacket wall (8) and a tight outer jacket wall (10), characterized in that the electric motor (1) and its cooling jacket (9) are both surrounded by a common, preferably water-filled coffer-dam (18) which is completely isolated from the cooling jacket (9) by the tight, outer jacket wall (10).
Claim 3
Dependent Claim
29 words
2) Improvements according to claim 1, characterized in that the outer jacket wall (10) of the cooling jacket (9) also constitutes the inner wall of the coffer-dam (18). 1
Claim 4
Dependent Claim
53 words
3) Improvements according to claim 2, characterized in that the pump (15, 16) and the motor (1) are located in a cargo space of an oil tanker or another ship for liquid cargo, and in that the coffer-dam (18) in the vertical direction extends substantially as far as right up to the deck.
Claim 5
Dependent Claim
37 words
4) Improvements according to claim 3, characterized in that the liquid pressure in at least the lower portion of the coffer-dam (18) is higher than the liquid pressure in the cooling jacket (9) and/or the cargo space.
Claim 6
Dependent Claim
39 words
5) Improvements according to claim 1, characterized in that the coffer-dam (18) surrounds an electric cable (20) which belongs to the motor (1) and which preferably extends substantially centrally through the coffer-dam in the whole extension of the latter.
Claim 7
Dependent Claim
26 words
6) Improvements according to claim 5, characterized in that the coffer-dam (18) has a considerably smaller circumference above the electric motor than just opposite the latter.
Claim 8
Dependent Claim
64 words
7) Improvements according to anyone of the claims 1 - 6, characterized in that the coffer-dam (18) has an end which is located adjacent the pump and extends radially inwards to a seal (13) or the like which is provided between the electric motor (1) and the pump (15, 16) and which surrounds a shaft (4) common to the electric motor and the pump.
References Cited (Backward Citations)
GB513195A
Cited
DE709287C
Cited
US2545422A
Cited
GB1096478A
Cited
DE1488461A1
Cited
DE2243027A1
Cited
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