US3808701A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for drying fluent materials
Assignee: Luwa Ltd
•
Filing: 1972-06-28
•
Granted: 1974-05-07
•
Expires: 1992-06-28
Abstract
Abstract An apparatus for drying fluent materials with an approximately horizontally arranged cylindrical conduit as well as a rotor rotating internally of such conduit. The rotor supports vane-like elements operatively associated with the inner wall of the conduit. The rotor carries a number of such elements which are successively arranged in the direction of rotation thereof and serve for wiping, circulating, comminuting and scraping of the fluent material. One of the elements is constructed at least as a wiper element and a further element is constructed at least as a scraper element, the free edge of which travels closer to the inner wall of the conduit that the free edge of the wiper element. The scraper element has throughpassage openings for scraped-off material.
Inventors
- 👤 R Bachmann
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 22:09
CPC Classifications
F; F26; F26B; F26B17/00; F26B17/18; F26B17/20
Claims Analysis
Total Claims: 22
Claim 1
Independent Claim
173 words
An apparatus for drying fluent material comprising an approximately horizontally arranged substantially cylindrical conduit defining therein an internal compartment and having a material inlet and material outlet, said conduit including a heat exchange surface confronting said compartment, means arranged within said conduit for conveying infed material therethrough, a rotatable motor arranged within said internal compartment, a plurality of elements which follow one another in the circumferential direction of rotation of said rotor and angularly offset from one another and carried by said rotor, said plurality of elements serving for the wiping, circulation, comminution and scraping of the material, one of said elements being constructed at least as a wiper element and another of said elements being constructed at least as a scraper element, said wiper element and said scraper element each having a respective free edge, the free edge of the scraper element being positioned closer to said heat exchange surface of said conduit than the free edge of the wiper element, said scraper element being provided with throughflow openings for scraped material.
Claim 2
Independent Claim
173 words
An apparatus for drying fluent material comprising an approximately horizontally arranged substantially cylindrical conduit defining therein an internal compartment and having a material inlet and material outlet, said conduit including a heat exchange surface confronting said compartment, means arranged within said conduit for conveying infed material therethrough, a rotatable motor arranged within said internal compartment, a plurality of elements which follow one another in the circumferential direction of rotation of said rotor and angularly offset from one another and carried by said rotor, said plurality of elements serving for the wiping, circulation, comminution and scraping of the material, one of said elements being constructed at least as a wiper element and another of said elements being constructed at least as a scraper element, said wiper element and said scraper element each having a respective free edge, the free edge of the scraper element being positioned closer to said heat exchange surface of said conduit than the free edge of the wiper element, said scraper element being provided with throughflow openings for scraped material.
Claim 3
Dependent Claim
52 words
The apparatus as defined in claim 1, wherein said scraper element defines a multi-purpose element which extends substantially over the entire length of said conduit and contains means for comminuting and circulating the material, said scraper element containing means for scraping the treated material from said heat exchange surface of said conduit.
Claim 4
Dependent Claim
55 words
The apparatus as defined in claim 2, wherein said multi-purpose element extends up to the region of said heat exchange surface of said conduit and extends radially only over a portion of the free space of said conduit, said multi-purpose element, viewed in the direction of rotation of the rotor, being flexed towards the rear.
Claim 5
Dependent Claim
27 words
The apparatus as defined in claim 3, wherein the width of the multi-purpose element approximately corresponds to 0.01 to 0.05 -fold of the diameter of the conduit.
Claim 6
Dependent Claim
41 words
The apparatus as defined in claim 3, further including radially extending webs for securing said multi-purpose element to said conduit, said flexed multi-purpose element enclosing with said radially extending webs an angle which is in a range between 40* and 80*.
Claim 7
Dependent Claim
13 words
The apparatus as defined in claim 5, wherein said angle amounts to 60*.
Claim 8
Dependent Claim
26 words
The apparatus as defined in claim 2, further including blade spring means connected with the rotor, said scraper element being secured to said blade spring means.
Claim 9
Dependent Claim
17 words
The apparatus as defined in claim 7, wherein said scraper element is radially arranged within said conduit.
Claim 10
Dependent Claim
28 words
The apparatus as defined in claim 7, wherein said blade spring means and said scraper element, viewed in the axial direction of said rotor, possess the same length.
Claim 11
Dependent Claim
51 words
The apparatus as defined in claim 7, wherein said rotor has a rotor core to which there is secured said blade spring means, said blade spring means, viewed in the direction of rotation of said rotor, extending rearwardly from the connection location of the blade spring means with said rotor core.
Claim 12
Dependent Claim
30 words
The apparatus as defined in claim 7, wherein a running clearance is provided between said heat exchange surface of the conduit and the confronting lengthwise edge of the scraper element.
Claim 13
Dependent Claim
39 words
The apparatus as defined in claim 2, wherein there is provided a further multi-purpose element and a further scraper element, said respective two multi-purpose elements and two scraper elements being arranged as substantially oppositely situated pairs at said rotor.
Claim 14
Dependent Claim
35 words
The apparatus as defined in claim 1, wherein said elements define a respective element seated upon said rotor for wiping, circulating, comminuting and scraping of the material from said heat exchange surface of the conduit.
Claim 15
Dependent Claim
29 words
The apparatus as defined in claim 13, wherein the element providEd for wiping comprises an axially extending wiper element which extends approximately over the entire length of the conduit.
Claim 16
Dependent Claim
56 words
The apparatus as defined in claim 13, wherein said element provided for circulating the material comprises a band extending approximately over the entire length of the conduit, said band, starting from the region of said heat exchange surface of the conduit, extending in radial direction only over a portion of the free space of the conduit.
Claim 17
Dependent Claim
36 words
The apparatus as defined in claim 15, wherein the band is arranged such that a running clearance is left free between said heat exchange surface of the conduit and the confronting lengthwise edge of the band.
Claim 18
Dependent Claim
26 words
The apparatus as defined in claim 15, wherein the radial extent of said band corresponds to 0.001 to 0.03 -fold of the diameter of the conduit.
Claim 19
Dependent Claim
62 words
The apparatus as defined in claim 13, wherein the element serving to comminute agglomerations of material comprises a vane-like element with axial interruptions and extending over substantially the entire length of the conduit, the end portion of said comminuting element confronting said heat exchange surface of the conduit, viewed in the direction of rotation of the rotor, being flexed towards the rear.
Claim 20
Dependent Claim
30 words
The apparatus as defined in claim 18, wherein the flexed portion of the vane-like element encloses an angle between 40* and 80* with the remaining portion of the vane-like element.
Claim 21
Dependent Claim
13 words
The apparatus as defined in claim 19, wherein said angle amounts to 60*.
Claim 22
Dependent Claim
85 words
The apparatus as defined in claim 13, wherein the element for scraping the material from said heat exchange surface of the conduit comprises a scraper element which, viewed in the direction of rotation of the rotor, is secured to a resilient element which extends rearwardly from the connection location with the rotor core, said scraper element being arranged approximately radially within the conduit and having a running clearance between said heat exchange surface of the conduit and the confronting lengthwise edge of the scraper element.
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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) | 1977-05-06 | 1977-11-05 | 1978-05-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-06 | 1981-11-05 | 1982-05-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-06 | 1985-11-05 | 1986-05-07 | $7700.00 | Window Closed / Lapsed |