Analysis on dust-proof safety and explosion-proof performance of general explosion-proof motor

Let's talk about the dustproof safety and explosion-proof performance of general explosion-proof motors.

To understand the explosion-proof motor, to understand its characteristics and explosion-proof functions, so as to better select and equip the explosion-proof motor, today we will list several very common explosion-proof motors for principle analysis:

Universal explosion-proof motor

General flameproof motor, that is, motor can withstand pressure and explosion, and the external parts that ignite explosive mixture in the production process are encapsulated in the shell, which is strong enough to withstand the pressure generated by the explosion of explosive mixture without leakage, thus ensuring safe production in places containing flammable and explosive gases.

The shell of the explosion-proof motor is not sealed. When the external explosive gas enters the motor through the gap between the operating part and the joint surface of each part and touches the internal ignition sources such as sparks, arcs and high temperature, it may explode. At this time, the flame or gas leakage will not cause the surrounding mixture to explode.

Explosion-proof function of dust explosion-proof motor

The production process of this kind of explosion-proof motor is completely different from that of ordinary motor, because it is used in dusty places, and the shell of explosion-proof motor has good sealing performance, which can prevent dust from entering the motor, and may not completely prevent dust from entering, and will not affect the normal operation of the motor.

This kind of motor is mainly used in dusty environment, such as mechanical equipment of grain depot. The motor shell has high sealing performance, which can reduce or prevent dust from entering. The higher surface temperature of the shell must not exceed the specified temperature, even if some dust enters, it is not enough to cause explosion.

What are the production requirements for increasing explosion protection?

The motor is mainly a reliable way to avoid dangerous high-temperature sparks and arcs, and it can run safely in the explosion danger area of Zone II. Brushless excitation is selected, rotating rectifier plate and static excitation cabinet are installed, and the excitation system is reliable, with accurate straight pole slip and no impact, reliable out-of-step protection of the excitation system, strong step-by-step ability, reasonable loop planning and discharge resistance, no heat during operation and wide adjustment range of driving current.

Special requirements for explosion-proof maintenance of motors

1. The explosion-proof motor shall not be disassembled at will; During disassembly, the explosion-proof surface of the parts cannot be used as the fulcrum of the crowbar, and it is not allowed to knock or hit the explosion-proof surface.

2. When disassembling the motor, first remove the hood and fan, and then remove the bolts of the end cover and bearing cover with a socket wrench. Then, knock the shaft along the axial direction with logs or copper bars to separate the end cover from the base, and then remove the rotor. When disassembling the parts, put the explosion-proof face up on the shelf, cover it with rubber or cloth gasket, and tighten the bolts and spring pads, so as not to lose them.

3. In the process of dipping paint and assembly, the insulating paint or dirt attached to the explosion-proof surface should be cleaned. Hard objects such as iron sheets should not be scratched, and uneven places can be polished with oilstone.

4. If the explosion-proof surface is damaged, lead-tin solder HISnPb 58-2 must be used. The flux is 30% hydrochloric acid (used for steel parts) or tin-zinc solder containing 58-60% tin, and the flux is a mixed solution of 30% ammonium chloride, 70% zinc chloride and 100-150% water (used for iron castings) for welding repair. The combination of solder and parts should be

5. To prevent the explosion-proof surface from rusting, apply engine oil or 204-1 instead of antirust oil on the explosion-proof surface.

The above is the content of Xiaobian's explanation. I hope I can help you. For more information, you can continue to pay attention to us. If you know more, you can also call us.