RICHARD M ARMSTRONG
Engineers in West Chester, PA
License number
Pennsylvania PE005928L
Category
Engineers
Type
Professional Engineer
Address
Address
West Chester, PA 19381
Professional information
Electric Immersion Heater Assembly Having An Isolated Terminal Box
US Patent:
4506140, Mar 19, 1985
Filed:
Nov 15, 1982
Appl. No.:
6/441483
Inventors:
Richard M. Armstrong - West Chester PA
International Classification:
H05B 382, F24H 100
US Classification:
219315
Abstract:
An electric heater adapted to be extended through an aperture in a tank wall for immersion in a fluid to be heated includes an elongated heater block structure formed by a metal core cast in a tubular metal shell. The core has a plurality of axially extending cavities, each removably receiving an individual elongated electric heating element having a terminal end extending from an open end of the cavity. An end plate secured to the shell of the heater provides a radially projecting flange for use in connecting the heater to the tank. The terminal end of each heating element projects through the end plate and the wall of a terminal box. Packing devices are provided around the heating elements to seal apertures in the end plate and terminal box wall through which the heating elements extend. The terminal box is spaced from the end plate to isolate the box from the heater block and the tank in order to minimize the possibility of leakage of liquid into the box. The heater further includes a temperature responsive device positioned in an elongated cavity in the core and extending through the end plate to a control unit regulating the current supply to the heating elements.