Technical structure and principle of duct electric heater

Currently, duct electric heaters are widely used in industrial and household appliances both domestically and internationally. They are primarily used for heating molds, drying paint and paper, and in plastic molding, extrusion, and rubber molding and vulcanization equipment. Custom production is available. Yangzhou Baoshiwei Electrical Co., Ltd. provides an overview of the technical structure and principles of explosion-proof electric heaters:

I. Using Enclosures to Confine Explosions and Isolate Ignition Sources

1. Using Enclosures to Confine Explosions

Using enclosures to confine explosions is a traditional explosion-proof method. The conductive components of the equipment are placed within an enclosure. External flammable gases enter the enclosure through gaps between the mating surfaces of the enclosure's components. If ignited by a fault spark from a conductive component within the internal electrical device, these mating surfaces cool the flames and explosion products emitted from the enclosure to a safe temperature, preventing them from igniting the explosive mixture surrounding the enclosure. In other words, the enclosure prevents the explosion from propagating outward. This type of explosion-proofing is generally referred to as gap flameproofing. This type of explosion-proofing is generally known as a flameproof enclosure abroad and as flameproof electrical equipment in my country.

Electric air heaters can achieve excellent thermal efficiency and are widely used in industrial ovens and air-burning fields. In view of the high surface temperature of the tube when the product is in operation, as well as the requirements for hot insulation and leakage current, the internal design uses high-temperature magnesium oxide powder and anti-oxidation heating wires, and selects high-temperature resistant stainless steel tubes. The installation and use environment are fully considered, and special treatment is required for component sealing to meet customers' requirements for the safety and life of the equipment's heating elements. So what are the functions of duct electric heaters? They are mainly used for heating the air in the air duct, and the specifications are divided into three types: low temperature, medium temperature, and high temperature. The common feature in the structure is that the electric heating tube is supported by a steel plate to reduce the vibration of the electric heating tube when the fan stops, and an over-temperature control device is installed in the junction box.