What are the classifications and characteristics of explosion-proof motors?
2022-04-19 15:59
Explosion-proof motor This is a motor that can be used in flammable and explosive environments and does not produce sparks during operation. Explosion-proof motors are mainly used in coal mines, oil and gas, petrochemicals, and chemical industries. In addition, they are widely used in textiles, metallurgy, urban gas, transportation, edible oil processing, papermaking, and pharmaceuticals. Explosion-proof motors are the main power equipment, mainly used to drive pumps, fans, compressors, and other transmission machinery.
Explosion-proof motor What are the classifications and characteristics? Let's take a brief look together.
Dust explosion-proof motors are designed and manufactured according to the specified conditions. They cannot completely prevent dust from entering the motor casing, but the inflow will not hinder the safe operation of the motor. The accumulation of internal dust is not easy to cause ignition hazards, and it will not cause the surrounding explosive dust mixture to explode during use.
(1) The casing has high sealing performance to reduce or prevent dust from entering the casing. Even if it enters, the inflow will not cause a fire hazard.
(2) Control the maximum allowable surface temperature of the casing to not exceed the specified temperature group. Currently, it has been used in the mechanized equipment of the national grain reserve.
The quenching motor uses an explosion-proof casing to separate sparks, arcs, and electrical parts that may generate dangerous temperatures from the surrounding explosive gas mixture. However, the casing is not sealed, and the surrounding explosive gas mixture can enter the motor through the gaps between the various parts of the casing. When it comes into contact with sparks, arcs, dangerous high temperatures, etc., inside the casing, an explosion will occur. At this time, the explosion-proof casing of the motor will not only not be damaged or deformed, but also will not ignite the surrounding explosive gas mixture when the explosion flame or hot gas flows out through the gaps.
What are the main characteristics of a quenching motor? Let's take a brief look together.
(1) The response to power level, installation size, and speed is consistent with DIN42673. Considering the inheritance of the YB series and the interchangeability with the Y2 series, adjustments have been made as needed to make it more efficient and applicable. (2) The entire series uses F-class insulation, and the temperature rise is evaluated according to B-class. (3) The noise limit is lower than the YB series, close to the I-class noise of the YB series, and the vibration limit is similar to the YB series. (4) The cabinet protection level is increased to IP55. (5) The entire series selects low-noise deep-groove ball bearings, and an oiling device is installed on motors with a height exceeding 180 mm. (6) The motor heat sink has parallel horizontal distribution and radial distribution, mainly parallel horizontal distribution. (7) The main performance indicators reached the international advanced level in the early 1990s.
A positive pressure motor is a type of positive pressure electrical equipment. What are its structural characteristics? Let's take a brief look together.
(1) The motor has a complete ventilation system inside, and there are no structural dead corners that may affect ventilation. (2) The casing and pipes are made of non-combustible materials and have sufficient mechanical strength. (3) Inside the casing and main organs, sufficient positive pressure is maintained based on the external atmosphere. (4) The motor must have safety devices such as a time relay and a flow monitor to ensure sufficient ventilation. It must also have automatic protection or alarm devices for the pressure of the gas in the casing. (5) The quick-opening door or cover of the casing must have a device driven by the power supply. Currently, there are no unified positive pressure motor series products in China.
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