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Tubular Heater
Dec 07, 2017

Tubular Heater

The tubular electric heating element (electric heating pipe) is made of metal tube (including stainless steel and copper tube), along the central axis of the tube uniformly distributed spiral electric heating alloy wire (nickel chrome, iron chrome alloy) gap filling compaction with good insulation thermal conductivity Performance of the magnesia, the nozzle ends sealed with silicone, this metal armored heating elements can heat the air, metal molds and a variety of liquids.

table of Contents

1 Introduction

▪ Features

▪ Structure

▪ Unit power

▪ Short-circuit fault

2 classification

3 heat

4 Precautions

5 verification standards

6 Power calculation

7 black treatment

8 common types


Heating pipe, also known as heating pipe, heating pipe, scientific name tubular electric heater components, in the metal tube into the wire-like heating wire (resistance wire)



And an insulating powder (MgO) having good heat resistance, thermal conductivity and insulating property is filled in the periphery and the space portion thereof, and both ends of the heating wire are provided with lead-out rods or lead-out wires. It has a simple structure, high mechanical strength, high thermal efficiency, safe and reliable, easy installation, long service life and so on. Widely used in a variety of salt stone trough, sink, tank, acid tank, fusible metal melting furnace, air heating furnace, drying furnace, oven, hot die and other devices.

Electric tube is specialized electrical energy into electrical energy components, because of its cheap, easy to use, easy installation, no pollution, are widely used in a variety of heating applications.


Small size, high power: the main use of bundles of heater tubular heating element. Heat fast response, high precision temperature control, integrated thermal efficiency. High heating temperature: Heater design task temperature up to 850 ℃. Medium outlet temperature average, high precision temperature control. The use of limited wide, strong compliance: The heater can be used for explosion-proof or popular places, explosion-proof grade up to d Ⅱ B-class and C-class, pressure up to 20MPa. Long life, high reliability: The heater is made of special electric data, design appearance of low power load, and the use of multiple maintenance, electric heater safety and life greatly added. Can be fully automatic control: according to the requirements of the heater circuit design can facilitate the completion of export temperature, flow, pressure and other parameters of active control, and computer networking. Energy-saving results are obvious, almost 100% of the energy generated heat to the heating medium.


Metal tubular heating pipe typical structure (the most popular structure) generally consists of five parts: insulators, sealing materials, leads to rods, fillers, electric wire, metal sheathing, terminals.

The spiral electric heating wire and lead-out rod are located at the center of the metal sheathing tube. The spiral electric heating wire is inserted into the seamless steel tube, the copper tube or the aluminum tube, and the gap is uniformly filled by the multi-tube filling machine. Thermal oxidation of the media, such as crystalline magnesia powder (also available alumina or clean quartz sand, etc.). And then reduce the tube diameter with a reduction machine, the oxide medium dense (density of 3.3g / cm3 or more), to ensure that the electric wire and air isolation, the central position does not shift and touch the wall. such. The heat per unit area can increase ten times. The service life can also be increased to 10 years. Compared with the same heat of the electric heating elements, tubular heating tube can save 5% of the electric material, and thermal efficiency can reach more than 90%.

Therefore, the view from the electric tube structure, the metal tubular electric heating tube is currently the most widely used, simple structure, reliable performance, long life sealed electric components, can be successfully used in industrial, household appliances, the use of more and more widely. Hope that more users of the structure of the electric tube with a clear understanding of the principle.

Unit power

Heating tube surface area of heat pipe unit power:


Load value(Wcm²)



φ10.1 ~φ14








The above surface load refers to the metal mold heating, water heating can be multiplied by 2 to 2.5. Air heating was 50% to 60%

The main parameters of electric heating pipe:

1. Power supply voltage, V;

2. Power frequency, Hz;

3. Rated voltage, V;

4. Rated power, kw;

5. Working temperature, ℃;

6. Outside diameter, (single head electric heating tube mold aperture), mm;

7. Deployment length, mm;

8. Overall dimensions, mm;

9. Weight, kg.

For how to develop more advanced electric tube material is a lot of companies are tackling the problem. Most of the electric heating pipe is generally the use of electric heating wire as a heating element. High-quality electric heating pipes are the best quality alloy electric wire as a heating element. But also leads to rods are encapsulated in the tube of magnesium oxide insulation medium to fix the heating element of the heating element. In the lead rod, it is connected with the heating element for the components and power supply, components and components connected with the metal conductive parts. The length of development is the sum of the straight line and the bending length of the metal pipe on the element pattern.

Short circuit fault

Burned resistance wire

Reasons: A, electric heating pipe caused by short-circuit burned;

B, electric heating tube lead or lead off caused short circuit;

C, resistance wire diameter is too small, lack of capacity;

D, electric socket accumulation of dirt or carbonization caused by short circuit

E, the power cord plug and electric socket short circuit;

Solution: A, replace the heating tube;

B, re-welding;

C, replace the appropriate resistance wire electric tube, under normal circumstances, the resistance of iron chrome aluminum wire can be used.

D, remove dirt, repair or replacement parts

E, repair or replace the power plug or electric socket;

No fever

Reasons: A, for adjustable temperature control heating pipe, temperature control contact with poor contact or burn out.

B, power supply is not normal or power failure;

C, resistance wire has been blown;

D, the power cord plug and the electric socket contact bad, or power line wire break;

E, electric tube has been burned;

F, electric heating tube lead or lead off;

Solution: A, bad heating pipe repair, the proposed replacement;

B, power supply is used normally;

C, the heating tube scrapped, re-install the same type of resistance wire;

D, check the line for repair or replacement;

E, replace the installation with the specifications of the electric tube;

F, re-welding leads or leads;


Reasons: A, the circuit wires fall off and the cup body collide;

B, electric tube burned and the cup short circuit;

C, not connected to the ground;

D, electric socket or power plug dirt too much;

E, electric heating pipe insulation damage;

F, improper cleaning, water exposed into the cup;

Solution: A, check the shedding wire, re-welding;

B, the electric tube has been damaged Replace the same specifications electric tube;

C, connected to the ground as required and check whether the correct;

D, the right to clean and dry;

E, check the repair if there is such an event suggested replacement;

F, properly cleaned and dried;

Category Editing

1, in accordance with outlet classification, can be divided into single-head electric heating pipe and double-headed.

2, in accordance with the material classification, can be divided into stainless steel electric tube, quartz electric tube, Teflon electric tube, titanium electric tube

3, in accordance with the shape classification, can be divided into straight electric tube, U-type electric tube, L-type electric tube, W-type electric tube, finned electric tube, shaped electric tube

4, in accordance with the purpose of classification, can be divided into dry and electric heating pipe burning electric tube

5, in accordance with the heating method of classification, can be divided into conventional resistance heating tube and radiation heating tube

Calorific value

You can use a voltage regulator to change the input voltage and current to change the heat.

Heat is proportional to the square of the voltage, and proportional to the square of the current.

When the voltage is 1/2 of the original value, the heat generation amount becomes 1/4

When the current becomes 1/2 of the original value, the heat generation amount becomes 1/4

* T (temperature difference) = P (power) * T (time) * M (total mass of material to be heated)


1, the components allowed to work under the following conditions: Air relative humidity of not more than 95%, non-explosive and corrosive gases. B. The working voltage should not be greater than 1.1 times the rated value, the shell should be effectively grounded. C. Insulation resistance ≥ 1MΩ Dielectric strength: 2KV / 1min.

2, electric heating tube should be positioned fixed, effective heat must be fully immersed in liquid or solid metal, is strictly prohibited air burning. Found that the surface of the pipe body scale or carbon, should be promptly removed and then clean, so as not to affect the heat and shorten the service life.

3, heating fusible metal or solid nitrate, alkali, asphalt, paraffin, etc., should first reduce the use of voltage, until the media is melted, to rise to rated voltage.

4, when the air heating elements should be cross-aligned, so that components have a good heat dissipation, so that the flow of air can be fully heated.

5, heating nitrate should be considered when the security measures to prevent the explosion.

6, the wiring part should be placed outside the insulation layer to avoid contact with corrosive, explosive media, water; lead wires should be able to withstand long-term part of the wiring temperature and heating load, tighten the wiring screws should avoid excessive force.

7, the components should be stored in a dry place, if the insulation resistance placed for a long time less than 1MΩ, the oven can be 200 ℃ or so, or reduce the voltage heating, until the restoration of insulation resistance.

8, electric heating pipe outlet of the magnesium oxide powder, in the use of places to avoid contaminants and water infiltration to prevent leakage accidents.

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