초록 ▼

A hot plate with a base and a heater plate, both the heater plate and the base being hollow and filled with an expanded and voluminously enlarged foam epoxy encapsulating the lead and power wires and pressing the electric resistance heater ribbon firmly against the ceramic top deck and extruding aro

A hot plate with a base and a heater plate, both the heater plate and the base being hollow and filled with an expanded and voluminously enlarged foam epoxy encapsulating the lead and power wires and pressing the electric resistance heater ribbon firmly against the ceramic top deck and extruding around the closure plate to seal and secure the entire heating plate and base in single unitary units. The method disclosed includes the pouring of the foaming epoxy system wherein the epoxy expands and creates a pressure within the cavities or chambers of the hot plate and urges the resistance heater firmly against and in intimate engagement with the top deck of the ceramic panel by reason of the growth of the foaming epoxy which seals and insulates against heat migration.

대표청구항 ▼

A hot plate to resist hostile environments including highly corrosive chemicals, comprising: a base through which power wires extend; a horizontal heater plate overlying the base in spaced and confronting relation and including a ceramic panel to carry and transmit heat to the heating load thereon,

A hot plate to resist hostile environments including highly corrosive chemicals, comprising: a base through which power wires extend; a horizontal heater plate overlying the base in spaced and confronting relation and including a ceramic panel to carry and transmit heat to the heating load thereon, the ceramic panel having downturned sides and edges spaced below the top face of the panel and defining a heater cavity, the heater plate having lead wires extending from the base to the heater plate and spanning the space therebetween, a bottom panel on the heater plate adjacent the downturned edges of the ceramic panel and having an opening through which said lead wires extend, the heater plate including a foamed epoxy filler in the heating cavity and sealed entirely around the periphery of the ceramic panel to the downturned sides thereof to exclude such corrosive chemicals from the heater cavity, the filler also providing efficient heat insulation against heat loss from the plate; a high temperature resisting and insulating pad in and extending entirely across the heater cavity between the downturned panel sides and lying between the filler and the ceramic panel; and an electric resistance heating element in the heater cavity and disposed between the pad and the ceramic panel, the heating element being pressed against and in intimate engagement with the ceramic panel and retained against the panel by pressure exerted from the filler and through the high temperature resisting pad to thereby efficiently transfer heat from the heating element to and through the ceramic panel to the heating load carried thereon.