Patent US2074455A successfully refreshed from Google Patents.
Patent US3767330A successfully refreshed from Google Patents.
US3767330A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electric hot water circulating pump with motor having an axial air gap
Assignee: Ercole Marelli and C SpA
•
Filing: 1971-08-20
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Granted: 1973-10-23
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Expires: 1991-08-20
Abstract
Abstract In an electric pump used for the circulation of hot water the inductor of the moor is formed by a stator of the front type and the armature consists of a fixed magnetic part and a movable disc of material having a high conductivity keyed onto the end of the shaft, onto the opposite end of which the pump impeller is keyed. By separating in this manner the electrical circuit of the rotor from the magnetic circuit the axial thrust is eliminated.
Inventors
- 👤 M Signorile
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:35
CPC Classifications
H; H02; H02K; H02K5/00; H02K5/04; H02K5/12; H02K5/128; H02K5/1282; F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/0666; H02K17/00; H02K17/02; H02K17/16
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
93 words
An electric pump for the circulation of liquid including a pump impeller which is positioned within a housing and operated by an asynchronous motor, said motor comprising first and second axially-spaced, fixed magnetic stators, a shaft mounting said pump impeller on one end thereof, a disc mounted on the other end of said shaft for rotation between said first and second magnetic stators, said rotating disc having an axially extending flange at its periphery and a depression formed in the central portion thereof, said flange surrounding a portion of said first magnetic stator.
Claim 2
Dependent Claim
93 words
An electric pump for the circulation of liquid including a pump impeller which is positioned within a housing and operated by an asynchronous motor, said motor comprising first and second axially-spaced, fixed magnetic stators, a shaft mounting said pump impeller on one end thereof, a disc mounted on the other end of said shaft for rotation between said first and second magnetic stators, said rotating disc having an axially extending flange at its periphery and a depression formed in the central portion thereof, said flange surrounding a portion of said first magnetic stator.
Claim 3
Dependent Claim
66 words
An electric pump in accordance with claim 1 wherein said first magnetic stator is supported by a shield having a central hub, said shield being provided with holes at its periphery and in the central hub of said shield, said rotating disc including holes formed in said depression, wherein in said shield holes and said disc hoLes balance the pressure of water circulating inside the pump.
Claim 4
Dependent Claim
22 words
An electric pump in accordance with claim 2 including a sealing diaphragm located between said second magnetic stator and said rotating disc.
Claim 5
Dependent Claim
24 words
An electric pump in accordance with claim 3 wherein said first magnetic stator is formed from a roll of rustproof steel having magnetic properties.
Claim 6
Dependent Claim
22 words
An electric pump in accordance with claim 3 wherein said first magnetic stator and said shield are formed of the same material.
Claim 7
Dependent Claim
21 words
An electric pump in accordance with claim 5 wherein said shield and said first magnetic stator are formed from cast iron.
Claim 8
Dependent Claim
21 words
An electric pump in accordance with claim 5 wherein said shield and said first magnetic stator are formed from sintered steel.
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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) | 1976-10-22 | 1977-04-23 | 1977-10-23 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-22 | 1981-04-23 | 1981-10-23 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-22 | 1985-04-23 | 1985-10-23 | $7700.00 | Window Closed / Lapsed |