High-power carbon-ceramic composite electric heating tube and processing technology thereof

Abstract

The invention provides a high-power carbon-ceramic composite electric heating tube. The high-power carbon-ceramic composite electric heating tube comprises an electric heating body, a metal electrode plate, a metal rod electrode and a metal rod electrode sealing sleeve, wherein the electric heating body is composed of a carbon-ceramic composite material blank and a carbon fiber woven electric heating layer wrapping the blank, the electric heating body is of a strip-shaped symmetrical structure, and each end of the electric heating body is sequentially connected with a metal electrode plate and a metal rod electrode; the electric heating body is located in a cavity formed by the outer shell, the metal rod electrode penetrates through one end of the shell, and the portion, making contact with the shell, of the metal rod electrode penetrates through the metal rod electrode sealing sleeve; and the end, connected with the metal electrode plate, of the metal rod electrode is of a Z-shaped arc-shaped bent structure, so that expansion deformation and breakage caused by heating of the electric heating body can be avoided under the condition that large current passes through the Z-shaped arc-shaped bent structure.

Description

technical field [0001] The disclosure belongs to the technical field of heating, and in particular relates to a high-power carbon-ceramic composite electric heating tube and its processing technology. Background technique [0002] The statements in this section merely provide background information related to the present disclosure and may not necessarily constitute prior art. [0003] Carbon fiber electric heating tubes have been widely used as heating elements, including heating elements in heating systems, etc. However, the existing carbon fiber electric heating tubes are suitable for low-power heating requirements, and when specific applications require high-power heating requirements At present, the current carbon fiber electric heating tube cannot be realized due to the limitation of its structure. [0004] The inventor found in the research that the current carbon fiber electric heating tube has the following technical problems: [0005] 1. Most of the electric heat...

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Problems solved by technology

[0007] 3. The electric heater with a spiral structure is prone to burrs during the production process, and the burrs are easy to generate sparks after power-on, which will cause damage to the carbon fiber spiral electric heater and affect its service life

[0008] 4. Most of the existing external power supply electrode electric heating tubes use carbon fiber spiral electric heating body - first crimped on the molybdenum sheet or nickel sheet, then spot welded on the molybdenum rod, and then the molybdenum rod is spot welded on the molybdenum sheet - again spot welded on the molybdenum Formed on the rod: (1) carbon fiber heating element - (2) crimping of molybdenum sheet - (3) spot welding of molybdenum rod - (4) connection of molybdenum sheet - (5) spot welding of molybdenum rod and then heating and packaging the shell quartz material In the way of export, because the molybdenum sheet is too thin, the cross-sectional area is small and the allowable current is small. If the molybdenum sheet is under high-power and high-current working conditions, the molybdenum sheet cannot bear the load and may easily cause the molybdenum sheet to burn. This structure limits the ability to produce high-power Carbon fiber electric heating tube limits its application range

[0009] 5. The sealing end of the carbon fiber electric heating tube is sealed by quartz glass hot-pressing. At the same time, the molybdenum sheet and the molybdenum rod of the inner and outer electrodes are hot-pressed and sealed in it. Due to the large current passing through the high-power working state, the cross-section of the molybdenum sheet electrode Small, easy to produce high temperature burning and bursting, resulting in damage to the end seal

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