By the principle of explosion proof explosion-proof electric equipment is: the live parts of electrical equipment placed in a special housing, the housing has a mixture of spark and arc shell and explosive generated electrical components shell isolation effect, and can withstand the explosive mixture into the shell generated by electric spark and arc the equipment shell detonated explosion pressure, while the shell is not destroyed; at the same time can prevent toward the outside of the shell explosive mixture detonation product explosive shell, shell will not cause the explosive mixture of combustion and explosion.

This special shell is called a flameproof shell. The electrical equipment with a flameproof shell is called a flameproof electrical equipment. The flameproof electrical equipment is d.

The flameproof electrical equipment has good detonating and detonating performance, and is widely used in explosive environmental workplaces such as coal mine.

Apart from the electrical part, the flameproof electrical equipment is mainly composed of flameproof enclosure and some components, which are attached to the shell, such as gaskets, transparent parts, cables, wires, lead-in devices and junction boxes.

According to the explosion proof principle of the flameproof electrical equipment, we know that the flameproof shell should have the performance of detonating and flameproof.

The so-called "explosion resistance" is the ability of the shell to withstand the explosion pressure of an explosive mixture in the shell, which itself does not produce damage and dangerous deformation.

The so-called flameproof performance is the flame ejected by the explosive mixture in the shell, which does not cause the explosion of the flammable mixture outside the shell.

In order to achieve the detonating and flameproof performance of the flameproof shell, there are special requirements for the shape, material, volume and structure of the flameproof shell.