| 摘要 |
PURPOSE:To secure the insulation of an insulating powder layer, by forming a vent on an outer tube for through burning of a gas uncompletely burned or yet to be ignited infiltrated into the insulating powder layer to prevent the precipitation of components such as carbon into a void in the insulating powder layer. CONSTITUTION:For example, two vents 6 are formed as opposed on the wall of an outer tube 1 surrounding the end of an insulating powder 5 layer to which the induction end of a thermocouple element 2 is exposed in such a manner as to let the outside of the outer tube 1 communicate with the insulating powder 5 layer inside the outer tube 1. The vents 6 introduce a gas outside the outer tube 1 into the insulating powder 5 layer filled into the outer tube 1. So to speak, a gas is supplied to the gas infiltrated into the insulating powder 5 layer from the end face thereof to burn it. |
