The explosion-proof measures for electrical equipment used in explosion-proof thermocouples in places where there is a risk of mixed explosion of methane and coal dust should meet the requirements of relevant national safety regulations.
There are many types of explosion-proof sensors, such as: explosion-proof photoelectric switch, explosion-proof temperature sensor, explosion-proof thermocouple, explosion-proof thermal resistance, explosion-proof motor and so on. The explosion-proof requirements of the sensors are very strict, especially in explosives, gasoline, alcohol, coal mines, petroleum, petrochemical applications are particularly extensive. The explosion-proof measures for electrical equipment used in explosion-proof thermocouples in places where there is a risk of mixed explosion of methane and coal dust should meet the requirements of relevant national safety regulations.
Type of explosion-proof sensor electrical equipment
Explosion-proof sensor electrical equipment, according to the selected explosion-proof principle, can be divided into: explosion-proof type (symbol d), increased safety type (symbol e), substantial safety type (symbol i), positive pressure type (symbol p) , Oil-filled type (symbol o), sand-filled type (symbol q), non-sparking see (symbol n), special type (symbol s). According to the different places of application, it is divided into two categories: Class I mine explosion-proof electrical equipment; Class E factory explosion-proof electrical equipment. In the mine communication and monitoring system, the explosion-proof type, the substantial safety type and the mixed type of the two are the most common.
Flameproof
Explosion-proof electrical equipment has a special explosion-proof enclosure. When the explosion occurs in the enclosure, its pressure does not cause the enclosure to burst, and the flame temperature that escapes the enclosure is already low enough, which does not cause methane, coal dust and other explosions outside the enclosure. . In other words, by restricting the size of the blasting to the outer shell, Pui reached the intention of flameproofing.
The flameproof enclosure is made of cast steel or cast iron with certain strength. The external competition is composed of the shell and the cover together. The joint surface (called flameproof surface) between the shell and the cover needs to have a regular width and gap, and to meet a certain finish, it is clear that the flameproof shell must have two One property is the explosion resistance, that is, the pressure and temperature of the internal methane or coal dust explosion will not damage or deform the outer shell. This is ensured by the nature of the outer shell material and the mechanical structure of the outer shell; That is, the explosion-proof surface should be able to cool the internal blasting product to below the safe temperature.
Intrinsically safe
The substantive safety type is mainly through reasonable selection of electrical circuits and circuit parameters, so that the electrical sparks and thermal effects of the circuit under normal operation and regular fault conditions will not cause the burning or explosion of the surrounding flammable gas. Substantially safe electrical equipment does not require a bulky enclosure like a flameproof device, and its outlets are safe regardless of normal operating conditions or regular fault conditions. Therefore, it has been widely used in the mine monitoring system.
There are still many requirements for the use of explosion-proof sites. The manufacturer of explosion-proof sensors must obtain an explosion-proof license before they can produce goods. The purchaser must know the relevant explosion-proof certificate, explosion-proof level, and field application before the acquisition.
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