US3653785A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Pump unit
Assignee: Xylem Water Solutions AB
•
Filing: 1970-04-07
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Granted: 1972-04-04
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Expires: 1990-04-07
Abstract
Abstract Pump unit for pumping polluted liquid such as sewage water, comprising a motor housing, which at least partially is surrounded by a cooling jacket forming a cooling liquid compartment, which is closed and, by means of a partition surrounding the motor housing, divided into an outer and an inner part which parts at the ends of the partition, viewed in the axial direction of the motor housing communicate with one another to permit circulation of the cooling liquid, so that inside the partition the cooling liquid flows in one direction and outside the partition in the opposite direction.
Inventors
- 👤 Jens Karl Adolf Dahlgren
- 👤 Bengt-Ake Rudolf Brandt
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 22:26
CPC Classifications
F; F04; F04D; F04D29/00; F04D29/58; F04D29/586; F04D29/5806; F04D13/00; F04D13/02; F04D13/06; H; H02; H02K; H02K5/00; H02K5/04; H02K5/20; H02K5/203
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
147 words
In an apparatus including a submersible pump for contaminated liquid such as sewage water, pulp or the like and having a pump housing, and a submersible electric motor drivingly coupled to the pump and having a sealed housing surrounding the motor, an improved closed liquid recirculation cooling system for the motor, comprising: a. a cooling jacket at least partially surrounding the motor housing and defining a closed liquid chamber, and b. a partition surrounding the motor housing and positioned within the liquid chamber to define an inner cooling chamber between the motor housing and the partition and an outer recirculation chamber between the partition and the cooling jacket, the inner and outer chambers communicating with each other at one end of the partition, c. means for circulating cooling liquid through the inner chamber in a first direction and through the outer chamber in a second, opposite direction.
Claim 2
Dependent Claim
147 words
In an apparatus including a submersible pump for contaminated liquid such as sewage water, pulp or the like and having a pump housing, and a submersible electric motor drivingly coupled to the pump and having a sealed housing surrounding the motor, an improved closed liquid recirculation cooling system for the motor, comprising: a. a cooling jacket at least partially surrounding the motor housing and defining a closed liquid chamber, and b. a partition surrounding the motor housing and positioned within the liquid chamber to define an inner cooling chamber between the motor housing and the partition and an outer recirculation chamber between the partition and the cooling jacket, the inner and outer chambers communicating with each other at one end of the partition, c. means for circulating cooling liquid through the inner chamber in a first direction and through the outer chamber in a second, opposite direction.
Claim 3
Dependent Claim
25 words
A cooling system according to claim 1, wherein the motor housing has cooling fins and the partition comprises a cup-shaped cover surrounding the cooling fins.
Claim 4
Dependent Claim
29 words
A cooling system according to claim 1, wherein said means for circulating cooling liquid comprises an impeller driven by the motor for providing forced circulation of the cooling liquid.
Claim 5
Dependent Claim
32 words
A cooling system according to claim 1 wherein the closed liquid chamber lies adjacent the pump housing at one end whereby the cooling liquid is itself cooled by the liquid being pumped.
Claim 6
Dependent Claim
14 words
A cooling system according to claim 4, wherein the oil compartment has cooling fins.
References Cited (Backward Citations)
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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) | 1975-04-04 | 1975-10-04 | 1976-04-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-04 | 1979-10-04 | 1980-04-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-04 | 1983-10-04 | 1984-04-04 | $7700.00 | Window Closed / Lapsed |