US3630431A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Valve-discharge disc centrifuge
Assignee: Mitsubishi Kakoki Kaisha Ltd
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Filing: 1970-03-10
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Granted: 1971-12-28
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Expires: 1990-03-10
Abstract
Abstract The solids discharge openings in the radially outermost wall of a disc centrifuge bowl can be opened and closed by means of a valve ring axially moved by hydraulic pressure in annular chambers separated in a circumferential groove of said outermost wall by a collar on the valve ring. The chambers are about as far from the axis of rotation as the farthest portion of the bowl cavity, and the necessary valve operating force is therefore generated by centrifugal forces in very small chambers. Either one or both chambers are supplied with water to open and close the discharge openings, the radial widths of the chambers being different.
Inventors
- 👤 Yoshinori Oka
- 👤 Ryuichi Takahashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 20:14
CPC Classifications
B; B04; B04B; B04B1/00; B04B1/10; B04B1/14
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
334 words
In a centrifuge having a bowl defining a cavity therein; drive means for rotating said bowl about an axis, the bowl having a bottom wall transverse to said axis and a circumferential wall formed with a discharge aperture for solids communicating with a portion of said cavity farthest from said axis, a valve member of annular shape about said axis, said valve member and said circumferential wall having respective first and second axial faces sealingly engaging each other, hydraulic valve operating means for moving said valve member axially toward and away from an operating position in which said valve member blocks said discharge aperture, and means for discharging liquid from said bowl separately from said solids, the improvement in the valve operating means which comprises: a. an annular collar on said first axial face, 1. said second axial face being formed with an annular groove extending about said axis, said groove being open in a radial direction and being of a radial depth smaller than the axial width thereof, 2. said collar being received in said groove in sealing engagement with said second axial face and axially sealing two chambers in said groove from each other, said chambers axially expanding and shrinking during said axial movement of the valve member, 3. said chambers being substantially as far from said axis as said portion of the cavity; and b. liquid supply means for alternatively supplying one oF said chambers or both chambers with liquid during rotation of said bowl, 1. said liquid supply means including means on said bottom wall defining a recess closely adjacent said axis, 2. two conduits connecting said recess to said chambers respectively and having respective orifices in said recess, one of said orifices being nearer said axis than the other orifice, 3. a source of liquid, and 4. valve means interposed between said source and said recess for keeping said recess sufficiently filled with said liquid during rotation of said bowl alternatively to reach one or both of said orifices.
Claim 2
Dependent Claim
334 words
In a centrifuge having a bowl defining a cavity therein; drive means for rotating said bowl about an axis, the bowl having a bottom wall transverse to said axis and a circumferential wall formed with a discharge aperture for solids communicating with a portion of said cavity farthest from said axis, a valve member of annular shape about said axis, said valve member and said circumferential wall having respective first and second axial faces sealingly engaging each other, hydraulic valve operating means for moving said valve member axially toward and away from an operating position in which said valve member blocks said discharge aperture, and means for discharging liquid from said bowl separately from said solids, the improvement in the valve operating means which comprises: a. an annular collar on said first axial face, 1. said second axial face being formed with an annular groove extending about said axis, said groove being open in a radial direction and being of a radial depth smaller than the axial width thereof, 2. said collar being received in said groove in sealing engagement with said second axial face and axially sealing two chambers in said groove from each other, said chambers axially expanding and shrinking during said axial movement of the valve member, 3. said chambers being substantially as far from said axis as said portion of the cavity; and b. liquid supply means for alternatively supplying one oF said chambers or both chambers with liquid during rotation of said bowl, 1. said liquid supply means including means on said bottom wall defining a recess closely adjacent said axis, 2. two conduits connecting said recess to said chambers respectively and having respective orifices in said recess, one of said orifices being nearer said axis than the other orifice, 3. a source of liquid, and 4. valve means interposed between said source and said recess for keeping said recess sufficiently filled with said liquid during rotation of said bowl alternatively to reach one or both of said orifices.
Claim 3
Dependent Claim
40 words
said collar being received in said groove in sealing engagement with said second axial face and axially sealing two chambers in said groove from each other, said chambers axially expanding and shrinking during said axial movement of the valve member,
Claim 4
Dependent Claim
40 words
said collar being received in said groove in sealing engagement with said second axial face and axially sealing two chambers in said groove from each other, said chambers axially expanding and shrinking during said axial movement of the valve member,
Claim 5
Dependent Claim
28 words
two conduits connecting said recess to said chambers respectively and having respective orifices in said recess, one of said orifices being nearer said axis than the other orifice,
Claim 6
Dependent Claim
28 words
two conduits connecting said recess to said chambers respectively and having respective orifices in said recess, one of said orifices being nearer said axis than the other orifice,
Claim 7
Dependent Claim
27 words
In a centrifuge as set forth in claim 1, the radial width of one of said chambers being greater than the radial width of the other chamber.
Claim 8
Dependent Claim
101 words
In a centrifuge as set forth in claim 1, said liquid supply means further including a hollow distributor member occupying a portion of said recess axially offset from said orifices and closely adjacent said axis, the portion of said distributor member nearest said axis being formed with a gap extending about said axis, a stationary nozzle extending through said gap into said distributor and having an orifice therein, said valve means communicating with said nozzle, said distributor member being formed with two passages connecting the hollow interior thereof with the portion of said recess communicating with the orifices of said conduit.
Claim 9
Dependent Claim
5 words
a source of liquid, and
Claim 10
Dependent Claim
5 words
a source of liquid, and
Claim 11
Dependent Claim
37 words
said chambers being substantially as far from said axis as said portion of the cavity; and b. liquid supply means for alternatively supplying one oF said chambers or both chambers with liquid during rotation of said bowl,
Claim 12
Dependent Claim
37 words
said chambers being substantially as far from said axis as said portion of the cavity; and b. liquid supply means for alternatively supplying one oF said chambers or both chambers with liquid during rotation of said bowl,
Claim 13
Dependent Claim
32 words
valve means interposed between said source and said recess for keeping said recess sufficiently filled with said liquid during rotation of said bowl alternatively to reach one or both of said orifices.
Claim 14
Dependent Claim
32 words
valve means interposed between said source and said recess for keeping said recess sufficiently filled with said liquid during rotation of said bowl alternatively to reach one or both of said orifices.
Claim 15
Dependent Claim
29 words
In a centrifuge as set forth in claim 3, one of said passages being nearer said axis than the other, said passages being adjacent respective orifices of said conduits.
Claim 16
Dependent Claim
43 words
In a centrifuge as set forth in claim 4, said valve means including a pressure responsive valve, said valve opening in response to a predetermined minimum pressure differential across the same, a bypass about said valve, and a shutoff valve in said bypass.
Claim 17
Dependent Claim
21 words
In a centrifuge as set forth in claim 1, said valve member being mounted on said circumferential wall outside said cavity.
Claim 18
Dependent Claim
78 words
In a centrifuge as set forth in claim 1, said second axial face being an outer face of said bowl, and said first face being an inner face of said annular valve member, said valve member being formed with a bleeder bore permanently open to the atmosphere and communicating with one of said chambers in the operating position of said valve member, said one chamber being connected by the associated one of said conduits to said one orifice.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-12-27 | 1975-06-28 | 1975-12-28 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-12-27 | 1979-06-28 | 1979-12-28 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-12-27 | 1983-06-28 | 1983-12-28 | $7700.00 | Window Closed / Lapsed |