초록 ▼

A water level sensing probe which comprises a central electrode encircled by a tubular ceramic insulator which is held between an integral laterally projecting portion of the electrode, which forms a conductive tip, and a tubular metal mounting body which surrounds and is displaced from the electrod

A water level sensing probe which comprises a central electrode encircled by a tubular ceramic insulator which is held between an integral laterally projecting portion of the electrode, which forms a conductive tip, and a tubular metal mounting body which surrounds and is displaced from the electrode that passes through it. The ceramic insulator is taper locked within the conductive tip at one end and within the tubular metal mounting body at the other end.

대표청구항 ▼

In an electrical water level sensing probe comprising an end body, a mounting body having a through passage formed therein and which is to be mounted in a side of a pressure vessel so that the end body is within the pressure vessel, a tubular ceramic insulator by which the end body and the mounting

In an electrical water level sensing probe comprising an end body, a mounting body having a through passage formed therein and which is to be mounted in a side of a pressure vessel so that the end body is within the pressure vessel, a tubular ceramic insulator by which the end body and the mounting body are interconnected, the interior of the tubular insulator communicating with the through passage, and a central electrode which is mounted on the end body and which extends through the interior of the tubular insulator and through the through passage of the mounting body with clearance therearound, there being a high pressure, high temperature sealing arrangement between the insulator and each of the end body and the mounting member, wherein the improvement comprises: the tubular ceramic insulator having a shallow external taper formed on it at either end and being in direct contact with and force fitted into a respective cavity which is formed in the respective one of the end body and the mounting body that are interconnected by the tubular ceramic insulator, each cavity being formed with a complementary taper such that there is an elastic strain of the respective one of the end and mounting bodies on assembly and the ceramic insulator is locked within the cavity of the respective body by directly contacting and interengaged tapered surfaces, the force fit being such as to cause sufficient elastic strain of the material of the respective body on assembly for the ceramic insulator to remain locked therein at the designed high operating temperature despite the thermal expansion of the bodies being greater than that of the ceramic insulator.