Electric heating – Inductive heating – With heat exchange
Patent
1995-05-30
1997-04-29
Leung, Philip H.
Electric heating
Inductive heating
With heat exchange
219667, 219470, 219516, 219471, H05B 614
Patent
active
056245939
DESCRIPTION:
BRIEF SUMMARY
BACKGROUND OF THE INVENTION
No. 3,581,060. design described in U.S. Pat. No. 3,581,060, the temperature sensors in the form of thin bars, are inserted into the godet casing parallel to the axis of rotation. This entailed, in particular in the case of godets with several heating zones, that it was necessary provide in the godet jacket, starting from its front end and distributed over its circumference, a number of bores of different depth corresponding to the number of heating zones, which resulted, in particular in the case of godets rotating at high speeds, not only in a considerable weakening of the godet casing, but also in unbalances which were complicated to remove. rotatable casing having one heated zone. Arranged in the interior of the casing is a stationary heating element. A flat temperature sensor is located on the heating element. The heating element and the temperature sensor are separated by an insulating cover.
The temperature sensor is arranged on the heating element facing the inside surface of the casing. The spacing between the temperature sensor and the inside surface of the casing is from about 0.3 to 1 mm. The air gap should correspond to about the boundary-layer thickness of the air, since it allows to maintain the most direct heat transfer. measured indirectly, since there is an air gap between the temperature sensor and the casing. fluctuation is registered, which does not occur necessarily also on the casing, since the temperature gradient in the air gap is dependent on the width of the air gap. gap may vary. To maintain a constant air gap, it is necessary to minimize manufacturing tolerances and a possible wear. This again results in that the manufacturing costs of a godet increase accordingly. invention to achieve a satisfactory temperature measurement of the godet casing.
SUMMARY OF THE INVENTION
on the inside surface of the godet casing, in particular parallel to the godet shaft. The temperature sensor is a measuring arrangement enclosed by an insulating cover with exposed tapping contacts leading outward via conduction paths.
This measure permits to eliminate the costly machining of the godet casing that is required in the state of the art. Essential however is in addition that the temperature sensors of a godet as used in accordance with the invention and designed to conform to the curvature of the godet casing and to rest thereagainst without interspace, have in all temperature measuring zones the same distance from the axis of rotation. As a result, the temperature gradient with respect to the yarn contact surface of the godet casing is or can be the same in all temperature sensors. The attachment to the inside surface of the godet casing is to be such as to cover the entire area. An attachment by gluing or clamping has shown to be suitable therefor.
Over their length, heated godets are subdivided mostly into several heating zones, in particular when they have a large overall length. In accordance with the invention, it is possible to associate over the circumference of the godet each heating zone with its own temperature sensor or, however, to scan all heating zones with a common multiple temperature sensor, the measuring ranges of this temperature sensor being distributed over the godet length in accordance with the several heating zones.
In particular in the latter instance, it may be useful to subdivide the temperature sensor in the axial direction into several identical, if need be, even interconnected measuring ranges, each having its associated tap, which are assigned to the heating zones of the godet. Suitably, the taps are combined at one end of the sensor strip and connected by conduction paths with their associated measuring ranges.
Likewise, it is possible to divide the temperature sensor strip extending over the length of the godet casing into a number of independent temperature sensors, which is equal to the number of heating zones of the godet casing, each temperature sensor having its own measuring line.
In one embodiment, the measuring taps of the tempe
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patent: 3286081 (1966-11-01), Scowcroft
patent: 3581060 (1971-05-01), Bauer et al.
patent: 3879594 (1975-04-01), Shillito
patent: 4533808 (1985-08-01), Newman
patent: 5142280 (1992-08-01), Lehle
patent: 5362945 (1994-11-01), Baader
Barmag AG
Leung Philip H.
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