Furnace tube for three-tube-cooperation high-temperature-resistant high-vacuum

Abstract

An outer tube of the furnace tube is an alundum tube, a middle tube is a metal tube, an inner tube is an alundum tube or a quartz tube, two ends of the outer tube are hermetically connected with flange joints, the flange joint at one end is provided with an inflation inlet, and the flange joint at the other end is welded and sealed with a left disc of a first vacuum clamp; one end of the middle pipe is closed, the other end of the middle pipe is open, one section of the closed end is located in the outer pipe, a cavity filled with protective gas is formed between the section and the outer pipe, and the outer side face of the section, extending out of the outer pipe, of the middle pipe is welded and sealed with the first vacuum clamp right disc; a second vacuum clamp left disc is welded to the open end of the middle pipe, and an extraction opening is formed in a second vacuum clamp right disc; an inner pipe with one closed end and the other open end is placed in the middle pipe, the closed end of the inner pipe and the closed end of the middle pipe are located on the same side, and the open end of the inner pipe and the open end of the middle pipe are located on the same side. The characteristics of the alundum tube, the metal tube and the quartz tube are combined and complement each other, so that the requirements of high temperature and high vacuum are met at the same time.

Description

technical field [0001] The invention relates to the field of heating furnace tubes, in particular to a furnace tube for a three-tube cooperative high-temperature and high-vacuum tubular furnace. Background technique [0002] The furnace tubes of the existing high temperature and high vacuum tube furnaces mostly use quartz tubes, corundum tubes, and metal tubes (stainless steel tubes and molybdenum tubes, etc.). Among them, corundum tube is suitable for various laboratory metal and non-metal sample analysis and melting materials. The operating temperature is 1200-1800 ° C, with good thermal conductivity, strong thermal shock resistance, high softening temperature, good resistance to rapid cooling and rapid heating, and is not easy to Bursting, good insulation and high-frequency properties at high temperature, chemical corrosion resistance, but because the corundum tube is Al 2 O 3 It is made of powder grouting and sintered at high temperature, so the air tightness is not go...

AI Technical Summary

Problems solved by technology

[0003] In order to overcome the above-mentioned deficiencies, the object of the present invention is to provide a kind of three-tube cooperative high-temperature-resistant high-vacuum tube furnace tube for the field, so that it can solve the problem that the existing single use of quartz tubes, corundum tubes, and metal tubes is difficult to achieve high temperature and high temperature at the same time. Technical Issues for High Vacuum Requirements

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