Tubular Air Heater, also known as tubular heating element or Sheath Heating Element, is an industrial heating element that uses electric current to generate Joule heating effect through a resistive material to generate heat. It uses a metal tube as the outer shell, filled with insulating thermal conductive material inside, and matched with a resistance heating wire to efficiently heat air, metal molds, and various liquids. With its advantages of simple structure, high thermal efficiency, safety and reliability, it has become a core heating component in industrial production and civilian fields.
1、 Product Overview
Tubular Air Heater, also known as tubular heating element or Sheath Heating Element, is an industrial heating element that uses electric current to generate Joule heating effect through a resistive material to generate heat. It uses a metal tube as the outer shell, filled with insulating thermal conductive material inside, and matched with a resistance heating wire to efficiently heat air, metal molds, and various liquids. With its advantages of simple structure, high thermal efficiency, safety and reliability, it has become a core heating component in industrial production and civilian fields.
2、 Core structure and working principle
The core structure of an Tubular Air Heater consists of a metal protective sleeve, a resistance heating wire, an insulation filler, a sealing material, and a lead out rod. Metal protective sleeves are usually made of high-temperature and corrosion-resistant materials such as stainless steel and copper, providing strong protection for internal components; The resistance heating wire is made of alloy materials such as nickel chromium and iron chromium, evenly distributed along the central axis inside the tube, and quickly converts electrical energy into thermal energy after being energized; Crystalline magnesia sand is filled between the heating wire and the protective tube, which has good insulation and thermal conductivity, and can quickly transfer heat to the surface of the metal tube; Both ends of the pipe mouth are sealed with materials such as silicone to prevent external impurities from entering and ensure the safe and stable operation of the components.
Its working principle is based on Joule heating effect: when an external power source supplies power to the resistance heating wire through a lead out rod, a large amount of heat is generated by the current flowing through the resistance wire. The heat is quickly conducted to the metal casing through magnesia sand, and then transferred to the heated medium such as air through conduction, convection or radiation, achieving precise temperature control and efficient heating.
3、 Product types and application scenarios
According to the structure, Tubular Air Heaters can be divided into single head electric heating tubes, double head electric heating tubes, U-shaped electric heating tubes, W-shaped electric heating tubes, etc; According to the application medium, it includes specialized Tubular Air Heaters, liquid heating tubes, and molten salt heaters. Among them, the dry burning Tubular Air Heater is specially designed for air heating, and some products are equipped with fin structures, which can greatly increase the heat dissipation area and improve the heat exchange efficiency, suitable for flowing air heating scenarios.
In the industrial field, Tubular Air Heaters are widely used in industries such as aerospace, shipbuilding, petrochemicals, and food processing. They are commonly used in ovens, drying equipment, air duct heaters, warm air blowers, and air conditioning auxiliary heating devices; In the civilian field, it is the core heating component of products such as electric ovens, sauna equipment, and commercial air conditioners, providing a stable heat source for daily life.
4、 Product advantages and usage precautions
Tubular Air Heaters have advantages such as high thermal efficiency (up to 90% or more), uniform heating, high mechanical strength, easy installation, and long service life (design life can reach more than 5000 hours). They support fully automated control and can achieve precise adjustment of temperature and power.
Attention should be paid when using: empty burning is strictly prohibited, and the effective heating area should be completely within the heated medium; When heating molten metal or solid nitrate, the voltage should be reduced first and then increased to the rated voltage after the medium melts; Regularly inspect the surface of the pipe body, promptly remove impurities such as scale and carbon deposits, and avoid affecting heat dissipation; Before reusing after long-term storage, it is necessary to measure the insulation resistance to ensure compliance with safety standards.
