US3763572A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and apparatus for pneumatically discharging a drum centrifuge
Assignee: Mannesmann Demag Krauss Maffei GmbH
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Filing: 1971-06-09
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Granted: 1973-10-09
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Expires: 1991-06-09
Abstract
Abstract A continuously operating filter centrifuge is automatically discharged and the discharged product is dried within the pneumatic conveyance system. The solvent vapors are reclaimed through condensation from the inert carrier medium which is recirculated. The gas-tight circulation system begins and ends at the centrifuge and thus avoids any noticeable losses in either product, or solvent, or nitrogen. It makes possible the elimination of the oxygen surveillance, previously needed to provide safety against explosions.
Inventors
- 👤 H Titus
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 12:55
CPC Classifications
B; B04; B04B; B04B11/00; B04B11/08; B04B15/00; B04B5/00; B04B5/10
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
130 words
A device for pneumatically discharging solid matter from a drum centrifuge comprising in combination: a gas-tight housing for the centrifuge; a gas-tight closed-circuit conduit system originating and terminating inside the centrifuge housing for circulating a contained carrier medium; the conduit system comprising: means for forcibly circulating the carrier medium; means for scraping from the drum of the centrifuge a layer of solid matter to be conveyed into the conduit system by the carrier medium; means for evaporating from the scraped-off solid matter the residual humidity during conveyance inside the conduit system; means for separating the solid matter from the carrier medium; a receptacle in the conduit system for collecting separated solid matter; and means for separating and collecting from the carrier medium the humidity previously evaporated from the solid matter.
Claim 2
Independent Claim
130 words
A device for pneumatically discharging solid matter from a drum centrifuge comprising in combination: a gas-tight housing for the centrifuge; a gas-tight closed-circuit conduit system originating and terminating inside the centrifuge housing for circulating a contained carrier medium; the conduit system comprising: means for forcibly circulating the carrier medium; means for scraping from the drum of the centrifuge a layer of solid matter to be conveyed into the conduit system by the carrier medium; means for evaporating from the scraped-off solid matter the residual humidity during conveyance inside the conduit system; means for separating the solid matter from the carrier medium; a receptacle in the conduit system for collecting separated solid matter; and means for separating and collecting from the carrier medium the humidity previously evaporated from the solid matter.
Claim 3
Dependent Claim
39 words
The device as defined in claim 1, wherein the evaporating means includes a heater for the carrier medium to permit heat-drying of the solid matter during conveyance inside a portion of said conduit system downstream of the drum cenTrifuge.
Claim 4
Dependent Claim
25 words
The device as defined in claim 2, wherein the heater is arranged upstream of the centrifuge housing, the heated carrier medium passing through the centrifuge.
Claim 5
Dependent Claim
59 words
The device as defined in claim 2, wherein the heater is arranged upstream of the centrifuge housing, the portion of said conduit system between the heater and the centrifuge including a bypass conduit leading to a portion of said conduit system downstream of the centrifuge, so that only a portion of the heated carrier medium passes through the centrifuge.
Claim 6
Dependent Claim
58 words
The device as defined in claim 2, wherein the portion of said conduit system upstream of the centrifuge housing includes a bypass conduit leading to a portion of said conduit system downstream of the centrifuge scraping means, the heater for the carrier medium being arranged in the bypass conduit, so that the heated carrier medium bypasses the centrifuge.
Claim 7
Dependent Claim
78 words
The device as defined in claim 1, wherein the scraping means includes a scraper housing mounted on the centrifuge housing, a movable discharge tube extending from the scraper housing into the drum of the centrifuge, a scraper head attached to the discharge tube and movable with the latter radially and axially relative to the drum, and a stationary suction tube with a telescopic connection to the movable discharge tube, the suction tube continuing downstream into the conduit system.
Claim 8
Dependent Claim
38 words
The device as defined in claim 1, wherein the solid matter separating means includes a cyclone-type separator and collection bunker in the conduit system downstream of the portion of said conduit system where the solid matter is dehumidified.
Claim 9
Dependent Claim
111 words
The device as defined in claim 1, wherein the humidity separating means includes a condenser arranged between the solid matter separating means and the centrifuge housing, the condenser including: an elongated condenser housing with an intake and outlet for the carrier medium as well as an independent intake and outlet for a coolant fluid; a plurality of substantially vertical coolant pipes of flattened cross-section arranged inside the condenser housing, the carrier medium passing horizontally between the vertical coolant pipes; and a vertical separator lip at the downstream extremity of each coolant pipe, the separator lip having a curved profile to catch the droplets of condensate forming in the passing carrier medium.
Claim 10
Dependent Claim
80 words
The device as defined in claim 8, wherein the coolant pipes are arranged in groups of parallel pipes with flow channels therebetween, the pipe groups being mounted in upper and lower pipe panels located at a distance from the respective condenser housing walls; the condenser further including baffle panels arranged alternately between the upper and lower pipe panels and the adjacent condenser wall, thereby causing an alternately rising and falling flow of coolant through the successive groups of coolant pipes.
Claim 11
Independent Claim
88 words
A method of discharging and processing the solvent-prepared solid matter from a drum centrifuge including the steps of: scraping from the centrifuge drum a thin layer of solid matter; passing a hot stream of carrier gas through the centrifuge to convey the scrapings of solid matter out of the centrifuge; drying the solid matter during conveyance through evaporation of its solvent residue; collecting the dried solid matter from the flowing carrier gas; and cooling the mixture of solvent vapor and carrier gas to reclaim the solvent as condensate.
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) | 1976-10-08 | 1977-04-09 | 1977-10-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-10-08 | 1981-04-09 | 1981-10-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-10-08 | 1985-04-09 | 1985-10-09 | $7700.00 | Window Closed / Lapsed |