Electric heating pipes are now very widely used, it can not only heat water, oil and other liquid heating, but also heat metal mold blocks, but also can be used for air heating such as pipes and paint rooms. Then there must be people curious about why the electric heating tube can be heated, and what material is the electric heating tube made of? And what role these materials play in electric heating tubes. Today's article will answer your questions.
What material is the electric heating tube made of?
Electric heating tubes have the following components:
What material is the electric heating tube made of?
First, the shell
1. The more commonly used electric heating tube is the metal shell, which is made of copper, iron and stainless steel.
2, copper material electric heating tube is more commonly used in civil tubes, copper material on the market for water heating is more common, the advantage is low cost, the disadvantage is easy to form patina, not resistant to high temperature.
3. Iron electric heating tube is often used for oil heating and air heating. However, it cannot be used for water heating, heating water is relatively easy to rust, and the life is not long.
4. Electric heating tubes made of stainless steel are widely used in the market, because stainless steel has more selectivity, and it can choose different grades of stainless steel according to different use environments and different working temperatures.
(1) Normal stainless steel 304 for heating water,
(2) Heating corrosive liquids can be made of stainless steel 316.
(3) The working temperature is 300-400 degrees, and stainless steel 304 material is selected
(4) Working temperature 500 degrees, choose stainless steel 321 material
(5) The working temperature is 700 degrees, and stainless steel 310S material is selected
Second, the resistance wire
The resistance wire is the main component of the electric heating tube, and it is also the heating element of the electric heating tube, and the electric heating tube is to achieve the purpose of heating by energizing the resistance wire.
There are two kinds of resistance wires commonly used in electric heating tubes, iron chromium aluminum wire and nickel chromium wire.
1. Iron chromium aluminum wire
The normal temperature resistance of iron chromium aluminum wire is about 1200 degrees, which is a very commonly used material for electric heating tubes, because it has high temperature resistance and relatively low cost.
2. Nichrome wire
Nickel-chromium wire is also temperature resistant to about 1200 degrees, but it is more flexible than iron-chromium aluminum wire, normally used in a vibration heating environment, of course, the cost is higher than iron-chromium aluminum wire.
Electric heating tubes are used in demanding environments and can also be used with Kantel and German resistance wires.
Third, filler
The filler of the electric heating tube is densely filled between the resistance wire and the shell, which mainly plays the role of insulation and thermal conduction, which is why the surface of the electric heating tube does not conduct electricity.
The filling material of the electric heating tube used to be quartz sand, and now it is used with improved and upgraded magnesium oxide powder, and the purity and dryness of the improved magnesium oxide powder have been greatly improved, so that the thermal conductivity and insulation performance of the electric heating tube has been greatly improved.
Magnesium oxide powder according to the working temperature to choose low temperature powder, medium temperature powder, high temperature powder, etc.
4. Terminal posts
The terminal post is connected with the resistance wire inside the heating tube, which is mainly used to connect the power line and energize.
The materials of the terminal posts are iron, copper, stainless steel, etc.
5. Sealing
The electric heating tube is normally sealed with high-temperature sealing glue, and the function of the sealing glue is to prevent moisture in the air from being inhaled into the tube and causing the electric heating tube to leak.
Normal electric heating tube will be equipped with a ceramic bead for insulation after being sealed with sealing glue.
6. Small nuts and small gaskets on the terminal posts
These are accessories for fixing the power cord, normally available in copper, iron, stainless steel.
The above six parts are the important components of the electric heating tube, and what materials each part is made of. Some complex electric heating tubes are also composed of flanges, fixed stops, fins, fasteners, etc.