H - Electricity
05
B
327/21
H05B 6/10 (2006.01) F16D 1/033 (2006.01) H02K 7/00 (2006.01) H05B 6/02 (2006.01) F02B 3/06 (2006.01)
Patent
CA 1138535
46,477 BOLT HEATER ABSTRACT OF THE DISCLOSURE Heating apparatus for axially expanding a connect- ing bolt prior to tightening to provide a predetermined de- gree of compression. The connecting bolt is provided with a central bore for receiving an electrical conductor. A low resistance conductor is disposed in electrical contact with the bolt at a suitable position along the inside diameter surface of the bore. Alternating current is transmitted from a power source through the conductor to its point of contact with the bolt. In response to the flow of alternating current through the conductor, an electromagnetic field is established around the conductor and on the surface of the central bore. This field confines the current flow within a limited cylindrical interior region of the bolt as it is conducted from the conductor to the top of the bolt. The current flow in the bolt material is equal and opposite in direction at any moment to that in the central conductor. The current penetrates the bolt to a radial depth which is a function of the magnetic saturation characteristic and resistivity of the bolt material, and of the current magni- tude. The bolt is heated by the effective resistive loss of the current flow within the iron material of the bolt. Since the heat is generated directly within the iron material of the bolt, direct heat transfer from the central conductor to the bolt is only incidental and is not essential to successful heating by the method and structure of the inven- tion. Furthermore, surface heat transfer limitations asso- ciated with conventional resistance heater arrangements are -1- 46,477 avoided.
278529
Mcconnell And Fox
Westinghouse Electric Corporation
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