US3771591A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Method and device for regulating the temperature of rotating grinding rolls having a hollow interior
Assignee: Buehler AG
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Filing: 1972-07-05
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Granted: 1973-11-13
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Expires: 1992-07-05
Abstract
Abstract The hollow interior of the rolls contains heat equalizing media which can have both a liquid phase and a vapor phase, the hollow interior being only partly filled with the medium in the liquid phase. During operation, locally undefined heat concentrations of the roll, on the inner surface of the roll, are reduced by evaporation of the liquid heat equalizing medium, and the heat content of the resultant vapor is transmitted to points of the roll whose instantaneous temperature is lower than the mean operating temperature of the roll, by condensation of the vapor at these points. The condensation or evaporation temperature of the heat equalizing media is beween the maximum and minimum operating temperatures at the static operating pressure prevailing in the interior of the rolls, and the absolute static pressure may be varied. The media, present in two phases of the interior of the roll, is excited into two oppositely directed eddy currents. Grinding rolls used with the invention have end walls to which there are connected tubular shaft ends having bores communicating with the hollow interior of the roll, and at least one shaft end is used for filling the liquid medium into the roll. A flow restriction may be provided between a tubular shaft end and the interior of the roll.
Inventors
- 👤 L Larsen
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 11:35
CPC Classifications
B; B02; B02C; B02C4/00; B02C4/28; B02C4/44
Claims Analysis
Total Claims: 14
Claim 1
Independent Claim
81 words
A method for equalizing the temperature of rotating grinding rolls having a hollow interior containing heat equalizing media, said method comprising reducing locally undefined heat concentrations of a roll by evaporating a liquid heat equalizing medium on the inner surface of the roll; and transmitting the heat content of vapor phase heat equalizing medium to points of the roll whose instantaneous temperature is lower than the mean operating temperature of the roll, by condensation of the vapor phase at these points.
Claim 2
Independent Claim
81 words
A method for equalizing the temperature of rotating grinding rolls having a hollow interior containing heat equalizing media, said method comprising reducing locally undefined heat concentrations of a roll by evaporating a liquid heat equalizing medium on the inner surface of the roll; and transmitting the heat content of vapor phase heat equalizing medium to points of the roll whose instantaneous temperature is lower than the mean operating temperature of the roll, by condensation of the vapor phase at these points.
Claim 3
Dependent Claim
52 words
A method for equalizing the temperature of rotating grinding rolls, as claimed in claim 1, in which the condensation temperature and evaporation temperature of the respective heat equalizing media is between the maximum and minimum operating temperature of the roll at the static operating pressure prevailing in the interior of the roll.
Claim 4
Dependent Claim
38 words
A method for equalizing the temperature of rotating grinding rolls, as claimed in claim 2, in which the condensation temperature and evaporation temperature of the respective heat exchange media corresponds to the mean operating temperature of the roll.
Claim 5
Dependent Claim
48 words
A method for equalizing the temperature of rotating grinding rolls, as claimed in claim 1, including adjusting the static pressure in the interior of the roll to control the evaporation temperature and condensation temperature of the respective media so that these are in agreement with desired operating conditions.
Claim 6
Dependent Claim
80 words
A method for equalizing the temperature of rotating grinding rolls, as claimed in claim 1, including exciting the respective media in the interior of the roll to provide two oppositely directed eddy currents, with the outer eddy current being directed primarily in the liquid phase from the circumferential inner periphery of the roll toward its axis and wIth the central eddy being directed primarily in the gaseous phase from the center of the roll to the ends of the roll.
Claim 7
Dependent Claim
88 words
A method for equalizing the temperature of rotating grinding rolls, as claimed in claim 1, comprising, with respect to two rolls in a roll frame, reducing locally undefined heat concentrations of each roll on the inner surface of the roll by evaporating a liquid heat equalizing medium; and transmitting the heat content of vapor phase heat equalizing media in each roll to points of the roll whose instantaneous temperature is lower than the mean operating temperature of the roll, by condensation of the vapor phase at these points.
Claim 8
Dependent Claim
94 words
A method for equalizing the temperature of rotating grinding rolls, as claimed in claim 1, including separately cooling the high speed roll in a roll frame; reducing locally undefined heat concentrations of the low speed roll on the inner surface on the low speed roll by evaporating a liquid heat equalizing medium; and transmitting the heat content of vapor phase heat equalizing medium to points of the low speed roll whose instantaneous temperature is lower than the mean operating temperature of the low speed roll, by condensation of the vapor phase at these points.
Claim 9
Independent Claim
62 words
A device for equalizing the temperature of rotating grinding rolls having a hollow interior containing heat equalizing media, said device comprising, in combination, a liquid phase heat equalizing medium sealed in said hollow interior; and a vapor phase heat equalizing medium sealed in said hollow interior; said liquid phase heat equalizing medium occupying only part of the volume of said hollow interior.
Claim 10
Independent Claim
62 words
A device for equalizing the temperature of rotating grinding rolls having a hollow interior containing heat equalizing media, said device comprising, in combination, a liquid phase heat equalizing medium sealed in said hollow interior; and a vapor phase heat equalizing medium sealed in said hollow interior; said liquid phase heat equalizing medium occupying only part of the volume of said hollow interior.
Claim 11
Dependent Claim
33 words
A device for equalizing the temperature of rotating grinding rolls, as claimed in claim 8, in which said liquid phase heat equalizing medium occupies about one half the volume of said hollow interior.
Claim 12
Dependent Claim
64 words
A device for equalizing the temperature of rotating grinding rolls, as claimed in claim 8, in which said roll is formed by a cylindrical roll shell having axially opposite end walls; and respective shaft ends secured to extend outwardly from each end wall; each shaft end having an axial bore communicating with the hollow interior defined by the roll shell and the end walls.
Claim 13
Dependent Claim
39 words
A device for equalizing the temperature of rotating grinding rolls, as claimed in claim 10, in which at least one shaft end bore serves, in a built-in roll, as a filling opening for said liquid phase heat equalizing medium.
Claim 14
Dependent Claim
61 words
A device for equalizing the temperature of rotating grinding rolls, as claimed in claim 10, including a flow restricting aperture in each end wall establishing communication between the associated shaft end bore and the hollow interior defined by the roll shell and the end walls, to retain a part of the liquid phase heat exchange medium in each shaft end bore.
References Cited (Backward Citations)
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US2011748A
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US2743384A
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US2909849A
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US3619539A
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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) | 1976-11-12 | 1977-05-14 | 1977-11-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-12 | 1981-05-14 | 1981-11-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-12 | 1985-05-14 | 1985-11-13 | $7700.00 | Window Closed / Lapsed |