Method and fixture for improving insulation heat-conducting property of electric heating tube
An electric heating tube, insulation and heat conduction technology, which is applied to metal processing equipment, heating element shape, forming tools and other directions, can solve the problems of electric heating tube damage, reduction in density of magnesium oxide powder, reduction in insulation and thermal conductivity of electric heating tube, etc. The effect of improving the thermal conductivity of insulation
Active Publication Date: 2011-05-18
ZHENJIANG DONGFANG ELECTRIC HEATER +1
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Problems solved by technology
In this way, in each U-shaped bending section of the electric heating tube, the shell material at the curved outer diameter of the electric heating tube is stretched, which causes the linear dimension of this part of the shell material to elongate, and the actual cross-section expands, thereby making the The density of magnesium oxide powder filled in this part of the shell decreases
The main function of magnesium oxide powder is to fix the heating wire in the center of the tubular shell and to insulate and conduct heat between the heating wire and the shell, and the density of magnesium oxide powder in the bending part of the electric heating tube will reduce this part. The insulation and heat conduction ability of the whole electric heating tube is reduced, which is also an important reason for the early damage of the electric heating tube.
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[0010] In the embodiment of the present invention, the electric heating tube semi-finished product filled with magnesia powder and bent is firstly obtained by a conventional method, and its U-shaped bending section is pressed from both sides by the tooling shown in the accompanying drawing. flat.
[0011] The specific operation process is: the U-shaped bending section of the tubular shell 3 of the electric heating tube semi-finished product is placed in the lower groove 21 on the tooling lower die 2 shown in the accompanying drawing, and then the upper die 1 and the lower die 2 are aligned. combine. The upper groove 11 is combined with the lower groove 21 to form a U-shaped inner cavity. Since the inner cavity size h1 of the inner cavity near the curved part is smaller and smaller than the outer diameter of the electric heating tube shell 3, the electric heating tube located in this part The heating tube is crushed, and the inner cavity size h2 of the inner cavity near the op...
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The invention belongs to the manufacturing technology of electric heating devices and relates to a method and a tool part for improving the insulating heat conductive performance of electric heating tubes. The method of the invention includes the following steps: in the machining process of the electric heating tubes, as to semi-finished products of bent electric heating tubes which are filled with powder insulating media, pressure is exercised to each U-shaped bent passage in the direction which is vertical to a distribution plane of central axis of the bent passage to flatten the bent passage so as to change the sectional area of the bent passage and increase the compactness of the insulating media in the tubes. By changing the shapes and sizes of the sections of the bent passages of the electric heating tubes in a flattening way, the technology can cause more porous powder insulating media in the shell of the part to be compacted so as to improve the insulating heat conductive performance.
Description
technical field [0001] The invention belongs to the manufacturing technology of an electric heating device, and relates to a method and tooling for improving the insulation and heat conduction performance of an electric heating tube. Background technique [0002] Ordinary electric heating tubes usually include a tubular casing, a heating wire passing through the casing, and a powdery insulating heat-conducting medium (usually magnesium oxide powder) filled between the heating wire and the inner wall of the casing. In order to meet the requirements of use, electric heating tubes are often bent into "U-shaped", "W-shaped" and other shapes. In this way, in each U-shaped bending section of the electric heating tube, the shell material at the curved outer diameter of the electric heating tube is stretched, resulting in the elongation of the linear dimension of this part of the shell material and the expansion of the actual cross-section, thereby making the The density of magnesi...
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IPC IPC(8): B21D37/10H05B3/48
Inventor 谭克
Owner ZHENJIANG DONGFANG ELECTRIC HEATER