US 4,304,975 AGranted

Inductively heatable godet

AssigneeBarmag Barmer Machinenfabrik Aktiengesellschaft

InventorsErich Lenk, Karl Bauer

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Abstract

An improved means for mounting the induction coil of an inductively heated, rotatable godet about the magnetic core thereof so as to prevent internal overheating and preferably also to avoid any movement or play between the core and the coil as caused by heat expansion and vibration during operation of the godet. The improvement comprises cooling means for cooling the laminated pack acting as the magnetic core and for thermally isolating the pack from the coil and outer godet shell or casing, said cooling means including at least one hose-like tube wound around the laminated pack with means to conduct a fluid coolant therethrough. An elastic intermediate member is preferably introduced at some point between the coil and magnetic core in order to compensate for any unequal thermal expansion of these elements in the axial and/or radial directions.

Claims7

Dependent claims

In an inductively heated godet of the type wherein a drive shaft projecting outwardly from its support on a machine frame drives a rotatable hollow casing which is secured to the outer end of the drive shaft and wherein a heating device is located between the drive shaft and casing on the machine frame, the heating device including a primary induction coil placed about a stationary laminated pack of ferromagnetic material and a secondary induction coil secured to the inner surface of the hollow casing, the improvement comprising:

cooling means for cooling the laminated pack and thermally isolating said pack from said induction coil and said casing, said cooling means including at least one hose-like cooling tube having inlet and outlet ends for conducting a fluid coolant therethrough, said tube being located between said laminated pack and said coil and being wrapped in a layer of side by side windings around and on said laminated pack;
means to supply a fluid coolant under pressure to the inlet end of said tube;
and
means to withdraw said fluid coolant from the outlet end of said tube.

1 more element

Dependencies are inferred from the claim text.