申海防爆
定義:
防爆電氣設備, 用符號表示 “d,” 是防爆設備的經典形式. 幾十年來, 隔爆結構已成為防爆電氣裝置開發與應用的首要選擇. 此類隔爆型電氣裝置防爆安全可靠, 擁有成熟的製造技術, and enjoy a long service life. They are widely used in hazardous locations with various combustible gas-air mixtures. 然而, due to the 隔爆型 結構, these devices are somewhat heavy and bulky.
防爆原理:
The safety and explosion-proof performance of this type of electrical equipment are ensured by a casing known as the “flameproof enclosure.”
A “flameproof enclosure” allows combustible gas-air mixtures to combust and 爆炸 inside the casing but prevents the explosion products from rupturing the casing or escaping through any passages to the exterior that could ignite the surrounding explosive mixtures. As long as the maximum surface 溫度 of the enclosure does not exceed the temperature class for its intended group, the device will not become an ignition source for the surrounding explosive gas-air mixture.
This is how flameproof electrical equipment operates.
Understanding this principle, we can deduce that the casing of flameproof electrical equipment must have sufficient mechanical strength to withstand the explosion pressure generated inside without undergoing significant deformation or damage. The gaps between components of a flameproof enclosure, which form channels from the inside to the outside, must have appropriate mechanical dimensions that can reduce or even prevent the escape of explosion products. This way, ignition of the 霹靂 gas-air mixtures around the equipment is prevented. The explosion protection levels for flameproof electrical equipment are classified into three grades: 國際投資協會, IIB, 和IIC. The protection levels of the equipment can also be categorized into three grades: 一個, 乙, 和c, commonly represented in practice as: Equipment of Group I, Ma and Mb; Equipment of Group II, 嘎, 國標, and Gc.
The enclosure of 防爆電氣設備 should be made from materials with good mechanical strength, such as steel plate, cast iron, aluminum alloy, copper alloy, 不銹鋼, and engineering plastics. The strength and gap dimensions must comply with the relevant requirements of GB3836.2—2010 Explosive Atmospheres Part 2: Equipment protected by flameproof enclosures.