JPS6358490U - - Google Patents

Description

[Brief explanation of drawings]

Fig. 1 is a partial cross-sectional view showing the configuration of a cast-in heater according to an embodiment of the present invention and how this cast-in heater is installed in a vacuum vessel, and Figs. 2 and 3 are illustrations of the current introduction part of the cast-in heater shown in Fig. 1. FIG. 2 is a front view of the cast-in heater, and FIG. 3 is a plan view thereof. FIG. 4 is a partial sectional view showing the configuration of a conventional cast-in heater and how the cast-in heater is attached to a vacuum container. 1, 11: Vacuum container, 2, 12: Cast heater, 3, 13: Metal pipe, 4: Resistor, 6, 16
: Ingot, 7: Output terminal, 16a: Current introduction part.

Claims (1)

[Scope of utility model registration request] A sheathed heater in which a linear or band-shaped resistor that generates heat when energized is embedded in a metal pipe insulated from the pipe via a heat-resistant insulating material, and pull-out terminals of the resistor are provided at both ends of the metal pipe. is cast into a heat conductive metal ingot except for the lead-out terminal, and the ingot is housed in a vacuum container, and the heating element is heated through the ingot by an electric current supplied from outside the vacuum container. In the casting heater that raises the temperature of the object to be heated in the container by the heat transferred by the metal pipe, both ends of the metal pipe are formed parallel to each other and open to the same side, and the ingot is formed such that both ends are opened to the same side. The metal pipe is collectively formed into a head, and this head forms a current introduction part that maintains airtightness between the head and the vacuum vessel and positions the lead-out terminal at the end of the metal pipe outside the vessel. A cast-in heater for vacuum heating.