Patent US3720004A successfully refreshed from Google Patents.
US3720004A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rotary drier for sludge
Assignee: Okawara Mfg Co Ltd
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Filing: 1971-11-30
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Granted: 1973-03-13
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Expires: 1991-11-30
Abstract
Abstract In a rotary drier for drying sludge by drying gas within a drum during travel of said sludge from one end to the other end of said drum, a deflector is provided in the proximity of a drying gas inlet to deflect the flow direction of drying gas so that the drying gas may flow evenly within the drum, and further stirring members and blade members are mounted on a rotary shaft extending through the drum so that the sludge charged into the drum may be broken and stirred and the drying gas may be caused to swirl to form turbulent flows by said stirring members and the velocity of the drying gas flowing toward an outlet of the drum may be lowered and the concentration of the sludge particles residing in the drum may be increased by said blade members.
Inventors
- 👤 D Okawara
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-31 17:42
CPC Classifications
F; F26; F26B; F26B11/00; F26B11/02; F26B11/028; C; C02; C02F; C02F11/00; C02F11/12; C02F11/13; F26B11/04; F26B11/0463
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
212 words
A rotary drier for sludge, comprising a drum having a sludge inlet and a drying gas inlet at one end and a drying gas and product outlet at the other end thereof, and rotatably mounted on a mounting base; elongate louver boards provided substantially axially on the inner surface of said drum for carrying the sludge upwardly incident to rotation of said drum; a deflector provided in said drum close to and in confronting relation with said drying gas inlet for deflecting the flow direction of the drying gas supplied from said drying gas inlet into said drum and thereby to distribute the drying gas evenly within the drum; a rotary shaft extending through said drum along an axis adjacent to the axis of said drum; stirring members mounted on said rotary shaft over the length thereof except for a portion close to said outlet and adapted to break and stir the sludge charged into the drum incident to rotation of said rotary shaft; blade members mounted on said rotary shaft adjacent said outlet and adapted to lower the velocity of the drying gas flowing within said drum toward said outlet incident to rotation of said rotary shaft; driving means for rotating said drum and driving means for rotating said rotary shaft.
Claim 2
Dependent Claim
212 words
A rotary drier for sludge, comprising a drum having a sludge inlet and a drying gas inlet at one end and a drying gas and product outlet at the other end thereof, and rotatably mounted on a mounting base; elongate louver boards provided substantially axially on the inner surface of said drum for carrying the sludge upwardly incident to rotation of said drum; a deflector provided in said drum close to and in confronting relation with said drying gas inlet for deflecting the flow direction of the drying gas supplied from said drying gas inlet into said drum and thereby to distribute the drying gas evenly within the drum; a rotary shaft extending through said drum along an axis adjacent to the axis of said drum; stirring members mounted on said rotary shaft over the length thereof except for a portion close to said outlet and adapted to break and stir the sludge charged into the drum incident to rotation of said rotary shaft; blade members mounted on said rotary shaft adjacent said outlet and adapted to lower the velocity of the drying gas flowing within said drum toward said outlet incident to rotation of said rotary shaft; driving means for rotating said drum and driving means for rotating said rotary shaft.
Claim 3
Dependent Claim
212 words
A rotary drier for sludge, comprising a drum having a sludge inlet and a drying gas inlet at one end and a drying gas and product outlet at the other end thereof, and rotatably mounted on a mounting base; elongate louver boards provided substantially axially on the inner surface of said drum for carrying the sludge upwardly incident to rotation of said drum; a deflector provided in said drum close to and in confronting relation with said drying gas inlet for deflecting the flow direction of the drying gas supplied from said drying gas inlet into said drum and thereby to distribute the drying gas evenly within the drum; a rotary shaft extending through said drum along an axis adjacent to the axis of said drum; stirring members mounted on said rotary shaft over the length thereof except for a portion close to said outlet and adapted to break and stir the sludge charged into the drum incident to rotation of said rotary shaft; blade members mounted on said rotary shaft adjacent said outlet and adapted to lower the velocity of the drying gas flowing within said drum toward said outlet incident to rotation of said rotary shaft; driving means for rotating said drum and driving means for rotating said rotary shaft.
Claim 4
Dependent Claim
212 words
A rotary drier for sludge, comprising a drum having a sludge inlet and a drying gas inlet at one end and a drying gas and product outlet at the other end thereof, and rotatably mounted on a mounting base; elongate louver boards provided substantially axially on the inner surface of said drum for carrying the sludge upwardly incident to rotation of said drum; a deflector provided in said drum close to and in confronting relation with said drying gas inlet for deflecting the flow direction of the drying gas supplied from said drying gas inlet into said drum and thereby to distribute the drying gas evenly within the drum; a rotary shaft extending through said drum along an axis adjacent to the axis of said drum; stirring members mounted on said rotary shaft over the length thereof except for a portion close to said outlet and adapted to break and stir the sludge charged into the drum incident to rotation of said rotary shaft; blade members mounted on said rotary shaft adjacent said outlet and adapted to lower the velocity of the drying gas flowing within said drum toward said outlet incident to rotation of said rotary shaft; driving means for rotating said drum and driving means for rotating said rotary shaft.
Claim 5
Dependent Claim
20 words
A rotary drier for sludge, according to claim 1, wherein said deflector is a disc mounted on said rotary shaft.
Claim 6
Dependent Claim
59 words
A rotary drier for sludge, according to claim 1, wherein the lateral rods of those of said stirring members which are located in the proximity of said outlet are arranged helically with respect to said rotary shaft, so that the velocity of the drying gas flowing toward said outlet may be decreased by the rotation of said stirring members.
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) | 1976-03-12 | 1976-09-11 | 1977-03-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-03-12 | 1980-09-11 | 1981-03-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-03-12 | 1984-09-11 | 1985-03-13 | $7700.00 | Window Closed / Lapsed |