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Title: Automatic thermocouple positioner for use in vacuum furnaces

Abstract

The invention is a simple and reliable mechanical arrangement for automatically positioning a thermocouple-carrying rod in a vacuum-furnace assembly of the kind including a casing, a furnace mounted in the casing, and a charge-containing crucible mounted in the furnace for vertical movement between a lower (loading) position and a raised (charge-melting) position. In a preferred embodiment, a welded-diaphragm metal bellows is mounted above the furnace, the upper end of the bellows being fixed against movement and the lower end of the bellows being affixed to support means for a thermocouple-carrying rod which is vertically oriented and extends freely through the furnace lid toward the mouth of the crucible. The support means and rod are mounted for relative vertical movement. Before pumpdown of the furnace, the differential pressure acting on the bellows causes it to contract and lift the thermocouple rod to a position where it will not be contacted by the crucible charge when the crucible is elevated to its raised position. During pumpdown, the bellows expands downward, lowering the thermocouple rod and its support. The bellows expands downward beyond a point where downward movement of the thermocouple rod is arrested by contact with the crucible charge and to amore » point where the upper end of the thermocouple extends well above the thermocouple support. During subsequent melting of the charge, the thermocouple sinks into the melt to provide an accurate measurement of melt temperatures.« less

Inventors:
;
Issue Date:
OSTI Identifier:
6868252
Assignee:
Dept. of Energy TIC; ERA-06-015937; EDB-81-047144
DOE Contract Number:  
W-7405-ENG-26
Resource Type:
Patent
Country of Publication:
United States
Language:
English
Subject:
42 ENGINEERING; REMOTE HANDLING EQUIPMENT; DESIGN; OPERATION; THERMOCOUPLES; POSITIONING; VACUUM FURNACES; EQUIPMENT; FURNACES; MATERIALS HANDLING EQUIPMENT; MEASURING INSTRUMENTS 420203* -- Engineering-- Handling Equipment & Procedures

Citation Formats

Mee, D.K., and Stephens, A.E. Automatic thermocouple positioner for use in vacuum furnaces. United States: N. p., 1980. Web.
Mee, D.K., & Stephens, A.E. Automatic thermocouple positioner for use in vacuum furnaces. United States.
Mee, D.K., and Stephens, A.E. Fri . "Automatic thermocouple positioner for use in vacuum furnaces". United States.
@article{osti_6868252,
title = {Automatic thermocouple positioner for use in vacuum furnaces},
author = {Mee, D.K. and Stephens, A.E.},
abstractNote = {The invention is a simple and reliable mechanical arrangement for automatically positioning a thermocouple-carrying rod in a vacuum-furnace assembly of the kind including a casing, a furnace mounted in the casing, and a charge-containing crucible mounted in the furnace for vertical movement between a lower (loading) position and a raised (charge-melting) position. In a preferred embodiment, a welded-diaphragm metal bellows is mounted above the furnace, the upper end of the bellows being fixed against movement and the lower end of the bellows being affixed to support means for a thermocouple-carrying rod which is vertically oriented and extends freely through the furnace lid toward the mouth of the crucible. The support means and rod are mounted for relative vertical movement. Before pumpdown of the furnace, the differential pressure acting on the bellows causes it to contract and lift the thermocouple rod to a position where it will not be contacted by the crucible charge when the crucible is elevated to its raised position. During pumpdown, the bellows expands downward, lowering the thermocouple rod and its support. The bellows expands downward beyond a point where downward movement of the thermocouple rod is arrested by contact with the crucible charge and to a point where the upper end of the thermocouple extends well above the thermocouple support. During subsequent melting of the charge, the thermocouple sinks into the melt to provide an accurate measurement of melt temperatures.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {1980},
month = {6}
}