Explosion-proof motors and ordinary motors, with the development of science and technology, production, the existence of explosive hazards in the place is also increasing, such as: flammable and explosive chemical plants, flour milling plants, breweries, oil fields and oil depots … These explosion-prone places, then the need to use explosion-proof motors and other explosion-proof electrical products.
Of course, in recent years, China’s highway is also developing rapidly, a large number of fuel stations appeared, but also to the explosion-proof motors provide a new market. Considering the factors of the environment, from the safety of explosion-proof motors is higher than ordinary motors.
Now we summarize the difference between explosion-proof motors and ordinary motors:
1, for the explosion-proof motor is completely sealed, does not allow any gas can enter the motor’s internal, including can not enter the junction box, so as not to spark caused by gas explosion, explosion-proof motors from the electromagnetic design, structure, dust, wiring methods, insulation level of protection, resistance to moisture resistance to mild corrosion, the internal conductor connection method – and so on and so forth, the requirements of all aspects of the motor than the ordinary motor.
2, explosion-proof motor junction box sealing is relatively good compared to ordinary motors.
3, explosion-proof motor protection level as low as IP55, while the ordinary motor IPIP23, IP44, IP54, IP55, IP56, etc., so from the appearance can be distinguished.
4, ordinary motor will produce electric sparks, so we use ordinary motors in these places is not possible, easy to cause accidents; explosion-proof motor is a kind of flammable and explosive plant can be used in a kind of motor, operation does not produce electric sparks. This will not bring disaster to the flammable and explosive places.
China’s current widely used low-voltage explosion-proof motor products of the basic series is the YB series of explosion-proof three-phase asynchronous motor, which is the Y series (IP44) three-phase asynchronous motor derivatives. Explosion-proof performance in line with GB3836.1-83 “explosion-proof electrical equipment for explosive environments with the General Requirements” and GB3836.2-83 “explosion-proof electrical equipment for explosive environments with explosion-proof electrical equipment “d”,” the provisions of the motor power range of O.55-200kW, the corresponding range of the seat number is the center of the seat height of 80-315nun; Explosion-proof marking for the dI, dIIAT4, dIIBT4, respectively, for coal mine underground fixed equipment or plant IIA, IIB level, temperature group T1-T4 group of combustible gases or vapors and air to form explosive mixtures of the place; the main body of the shell protection level of IP44, can be made into IP%4, the junction box protection level of IP54; the rated frequency of 50Hz, the rated voltage 380 The rated frequency is 50Hz, and the rated voltage is 380, 1660, 1140, 380/660, 660/140V; the insulation level of the motor is F, but the temperature rise of the stator winding is assessed according to the B level, and there is a large temperature rise margin. The main models of low-voltage explosion-proof three-phase asynchronous motors derived series are: YB series (dIIcT4) (seat center height of 80-315mm), YBSO series (small power, seat center height of 63-90mm), YBF series (for fans, seat center height of 63-160mm), YB-H series (for ships, seat center height of 80~280mm). YB series (medium-sized, seat center height of 355-450mm), YBK series (for coal mine, seat center height of 100-315mm), YB-W, B-TH, YB-WTH series (seat center height of 80-315mm), YBDF-WF series (outdoor anticorrosive and explosion-proof electric valve, seat center height of 80-315mm) and YBDC series (explosion-proof capacitor start single-phase asynchronous motors, the center height of the seat is 71-100mm) and YBZS series of explosion-proof two-speed three-phase asynchronous motors for lifting. In addition, there are YB series of high-voltage explosion-proof three-phase asynchronous motors (the center height of the seat is 355-450mm, 560-710mm). Industry jointly designed YB2 series has passed the national appraisal at the end of 1 four, will gradually replace the YB series, become China’s explosion-proof three-phase asynchronous motor of the basic series.YB2 series of a total of 15 chassis number (seat center height of 63, 355nmm), the power range of O.12-315kW.
Its main features are:
(1) Correspondence of power rating, mounting dimensions and rotational speed is consistent with DIN 42673, and at the same time necessary adjustments have been made to make it more effective and applicable in consideration of the inheritance with YB series and interchangeability with Y2 series.
(2) The whole series adopts class F insulation, and the temperature rise is assessed according to class B.
(3) The noise limit value is lower than YB series, close to the YB series of class I noise, vibration limit value is comparable with YB series.
(4) Shell protection level increased to IP55.
(5) Low noise deep groove ball bearings are used for the whole series, and oil injection and discharge devices are provided for motors with a seat center height of 180mm or more.
(6) The motor heat sink has parallel horizontal distribution and radiation distribution of two kinds, to parallel horizontal distribution of the main.
(7) The main performance indexes have reached the international advanced level in the early 1990s.
Post time: Jun-27-2024
