US4065234A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Magnetically driven rotary pumps
Assignee: Nihon Kagaku Kizai KK
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Filing: 1975-12-22
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Granted: 1977-12-27
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Expires: 1995-12-22
Abstract
Abstract A magnetically driven, powerful rotary pump comprising at least one driven magnet secured to the rotary shaft of a pump and housed in a magnet case to separate the driven magnet in a liquid-type chamber from the pump chamber and at least two driving magnets secured to a drive shaft to be connected to a power source, with the at least one driven magnet being housed in the magnet case and being sandwiched in between the driving magnets. In one embodiment, the at least one driven magnet treated to be corrosion resistant and the magnet case is made of a corrosion resistant material or treated to be corrosion resistant, thereby rendering it unnecessary to form a liquid-tight seal between the pump chamber and the inside of the magnet case.
Inventors
- 👤 Honma Yoshiyuki
- 👤 Yamazaki Fumio
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 05:51
CPC Classifications
H; H02; H02K; H02K49/00; H02K49/10; H02K49/104; H02K49/108; F; F04; F04D; F04D13/00; F04D13/02; F04D13/06; F04D13/0606; F04D13/064; H02K5/00; H02K5/04; H02K5/12; H02K5/128
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
344 words
In a magnetically driven rotary pump driven from a power source comprising a casing, a rotary shaft rotatably mounted in said casing, a pump impeller mounted on said rotary shaft, a pump chamber means disposed about said pump impeller and in which said pump impeller operates, said pump chamber means being axially juxtaposed at one longitudinal end of said casing, at least one driven permanent magnet secured to said shaft, said driven magnet being in the form of a disc and being housed in said casing, driven means comprising at least two driving permanent magnets secured to a drive shaft which is driven by said power source, said driven means being rotatably mounted independently of the rotatable mounting of said rotary shaft, said drive shaft having its axis concentrically disposed relative to the axis of said rotary shaft and being axially juxtaposed at the side of said casing opposite to the side of the casing at which the pump housing means is axially juxtaposed, said at least two driving magnets being located outside of said casing with each driving magnet having a generally disc-like configuration having a central opening such that the latter encircles portions of said casing, said at least two driving magnets being axially spaced from one another and being located on opposite sides of said at least one driven magnet such that the latter is sandwiched between said at least two driving magnets, said at least two driving magnets being separated from said at least one driven magnet by said casing, said at least two driving magnets having outer peripheries which are connected by a joint plate disposed radially outwardly of said casing, whereby said at least one driven magnet is caused to be rotated by said at least two driving magnets by virtue of the magnetic attraction between said at least two driving magnets and said at least one driven magnet, said disposition of said at least two driving magnets on opposite sides of said at least one driven magnet resulting in substantially eliminating axial thrust of said rotary pump.
Claim 2
Dependent Claim
344 words
In a magnetically driven rotary pump driven from a power source comprising a casing, a rotary shaft rotatably mounted in said casing, a pump impeller mounted on said rotary shaft, a pump chamber means disposed about said pump impeller and in which said pump impeller operates, said pump chamber means being axially juxtaposed at one longitudinal end of said casing, at least one driven permanent magnet secured to said shaft, said driven magnet being in the form of a disc and being housed in said casing, driven means comprising at least two driving permanent magnets secured to a drive shaft which is driven by said power source, said driven means being rotatably mounted independently of the rotatable mounting of said rotary shaft, said drive shaft having its axis concentrically disposed relative to the axis of said rotary shaft and being axially juxtaposed at the side of said casing opposite to the side of the casing at which the pump housing means is axially juxtaposed, said at least two driving magnets being located outside of said casing with each driving magnet having a generally disc-like configuration having a central opening such that the latter encircles portions of said casing, said at least two driving magnets being axially spaced from one another and being located on opposite sides of said at least one driven magnet such that the latter is sandwiched between said at least two driving magnets, said at least two driving magnets being separated from said at least one driven magnet by said casing, said at least two driving magnets having outer peripheries which are connected by a joint plate disposed radially outwardly of said casing, whereby said at least one driven magnet is caused to be rotated by said at least two driving magnets by virtue of the magnetic attraction between said at least two driving magnets and said at least one driven magnet, said disposition of said at least two driving magnets on opposite sides of said at least one driven magnet resulting in substantially eliminating axial thrust of said rotary pump.
Claim 3
Dependent Claim
78 words
In a magnetically driven pump according to claim 1 wherein there are at least two driven permanent magnets secured to said rotary shaft, said at least two driven permanent magnets being axially spaced from one another, and there are at least three driving permanent magnets secured to said drive shaft in axially spaced array and arranged such that said at least two driven permanent magnets are alternately disposed and sandwiched between said at least three driving permanent magnets.
Claim 4
Dependent Claim
31 words
In a magnetically driven pump according to claim 2 wherein said at least three driving magnets have their outer peripheries connected by said joint plate disposed radially outwardly of said casing.
Claim 5
Dependent Claim
20 words
In a magnetically driven pump according to claim 1 comprising bearing means rotatably supporting said driven means on said casing.
Claim 6
Dependent Claim
26 words
In a magnetically driven pump according to claim 1 wherein there are at least two axially spaced bearing means supporting said driven means on said casing.
Claim 7
Dependent Claim
25 words
In a magnetically driven pump according to claim 1 wherein means are provided to effect a liquid-tight seal between said casing and said pump chamber.
Claim 8
Dependent Claim
34 words
In a magnetically driven pump according to claim 1 wherein said at least one driven magnet and said casing are corrosion resistant, thereby obviating a liquid-tight seal between said pump chamber and said casing.
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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) | 1980-12-26 | 1981-06-27 | 1981-12-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-12-26 | 1985-06-27 | 1985-12-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-12-26 | 1989-06-27 | 1989-12-27 | $7700.00 | Window Closed / Lapsed |