Apa is a berulir elektrik pemanasan tiub?

Apa is a berulir elektrik pemanasan tiub?

Screw thread electric heating tube is made of metal tube as the outer shell and filled with high resistance electric heating alloy wire as the heating material. It is filled and compacted around the electric heating wire, and has good insulation performance. High purity magnesium oxide with high thermal conductivity is used as the filling material. This product has the characteristics of high inherent power, high thermal efficiency, and fast heat dissipation. Commonly used for heating plastic packaging, small molds, analytical instruments, cigarette industry, footwear industry, semiconductor eutectic welding, input channel heating of die-casting parts, as as cooling effects during non pouring injection and various gas expansion.

The structure of the tubular electric heating element of the externally threaded electric heating tube is to insert an electric heating wire into a metal tube and tightly fill the gap with crystalline magnesium oxide with good thermal conductivity and insulation. The difference between hexagonal threaded flange electric heating pipes and flat flange electric heating pipes lies in the fact that they have threaded threads. Secara amnya, the threads are pipeline threads, including 6-inch, 1-inch, 1.2-inch, 1.5-inch, etc. Non standard electric heating tubes, when ordering, must be informed of: voltage, power, pipe diameter, composition of several U-shaped tubes, heating medium, flange thread size, material, etc

Apa is the expansion of the electric heating tube body?

Contoh: Analisis daripada sebab for solid expansion in SUS304 stainless steel pipes.

SUS304 stainless steel wire expansion coefficient (10-6/ degree ) is related to temperature ( degree ) and is divided into 5 temperature ranges:

① The linear expansion coefficient is 16.0 at 20-100 degree ;

② The linear expansion coefficient is 16.8 at 20-200 degree ;

③ The linear expansion coefficient is 17.5 at 20-300 degree ;

④ The linear expansion coefficient is 18.1 at 20-400 degree ;

⑤ The linear expansion coefficient is 19.0 at 20~800 degree .

The calculation formula for the diameter expansion of stainless steel pipes is

∆ d= X d0 x (t1 t0)

In the formula, ∆ d - diameter expansion, mm;

--- Expansion coefficient of 304 stainless steel wire;

D0-- Initial pipe diameter, mm;

T0- initial temperature, degree ;

The temperature after t changes, degree .

Bila the electric heating tube with a diameter of 6.6mm is energized to reach the working temperature, the surface temperature of the tube can reach approximately 800 degree . By substituting the corresponding parameters into the formula, we can obtain

∆ d{{0}}.0 × 10-6 × 6.6 × (800-20){6}}}.097812mm

Menurut kepada this calculation result, when the surface temperature of the pipe reaches 800 degree , if it is SUS304 pipe material, it is normal for the pipe diameter to expand from 6.6mm to around 6.7mm. But if it is not a pure SUS304 pipe material containing metal elements with high linear expansion coefficient, there will be greater expansion, even bursting of the metal pipe. Selepas dissection, it will be found that there is a clear gap between the pipe wall and the insulation layer of magnesium oxide. The quality of the pipe is unqualified, the wall thickness is uneven, and there are impurities, virtual welds, missing welding points, etc. in the welded pipe, which cannot withstand the heat expansion after heating and cause the pipe body to expand and burst.

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