The rationale that explosion proof electric machinery achieves explosion proof to ask according to its is different can divide for below 3 kinds of types or their compound model.
(1) lie between explode model, d, (our country calls B model) when electric machinery interior produces explosion, do not cause the electric machinery that exterior volatile mixture explodes. Electric machinery crust has enough mechanical strength (high grade is cast-iron, armor plate is housing) , those who make can bear to explosive pressure and outside force are pounded and do not damage; Comprise the overall gap of whole flameproof enclosure, be like: Upright lid stops the place such as the mouth must be accorded with lie between explode the structural parameter of joint face (clearance and length) ; The wiring box, device that take a line raise a requirement; Control the temperature of crust surface, make its cannot reach dangerous temperature.
(2) add how model, e (our country calls A model) electric machinery sealing is close friends, use IP55 defend grade asks; Electromagnetism design should consider to reduce temperature rise; Control achieves the time of dangerous temperature when rotor locked-rotor, deserve to have charge electric unit oneself; Those who raise winding insulation is v/LIT all over the ground, reach voltage of alternate with experiment rightly; Raise conductor connective dependability; Control is decided, rotor is the smallest unilateral clearance. Anyhow prevents the generation of accident scintilla, electric arc or dangerous temperature from structure and electric field, improve the degree of safety that move thereby.
(3) profiling, p. To connect inside housing pressing fresh air or fill inert gase (be like: Nitrogen) with block Stop the explosion proof electric machinery that exterior explosion mixture enters electric machinery interior.
Lie between explode model and profiling applies to all hazardous area, our country is lain between explode model electric machinery (B) use morer. Add how model electric machinery production cost and price should explode than lying between model low, apply to 2 areas place only.
3, Volatile gas atmosphere is electric equipment (electric machinery) classification
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