Apparatus for the measurement of temperatures by thermocouple contacts

摘要

914,833. Measuring electrically. ELECTRICITE DE FRANCE - SERVICE NATIONAL. Dec. 13, 1960 [Dec. 17, 1959; Nov. 28, 1960], No. 42931/60. Class 40 (1). The temperature inside a nuclear reactor is measured by means of a thermocouple mounted in a housing 4 which can be slid through a tube into the interior of the heater. Contact members 9 at the end of the housing engage corresponding contact members 10 on an intermediate housing 5 and as many of these intermediate housings may be inserted as are necessary to reach the part of which the temperature is to be measured. The housing 6 has spring-loaded contacts 11 which engage contact rings 12 in the wall of the housing to enable the thermocouple output to be taken off. Fig. 2 shows the contact assembly 9 which comprises a contact ring 18 to which one of the thermocouple leads is connected and a spring-loaded centre contact 23. Fig. 3 shows one of the housings provided with members 14 which guide the housing in the reactor tubes and spring-loaded contacts 11 which engage the contact rings 12. In an alternative construction of end contacts the leads from a thermocouple are brought up the outside of the housing. Fig. 7 shows a construction of the final element the output from the thermocouple being taken from pivoted arms 56 which are spring- loaded to engage contact-rings 12 surrounding the passage in the reactor wall through which the thermocouple passes. The ends of the contact arms are urged apart by spring 65 which draw their opposite arms together. When the device is to be withdrawn from the hole in the reactor wall it is pulled by the head when pistons 70 slide upwardly to engage short arms 63 on the pivoted links which are thus pivoted to lie in slots 59 along the side of the device when it is entering or leaving the hole in the reactor wall.