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Explosion proof motor

Explosion proof motor

1. Explosion-proof electric motors are used as the main power equipment and are commonly used to drive pumps, fans, compressors and other transmission machinery. It is also widely used in textile, metallurgy, city gas, transportation, grain and oil processing, paper, medicine and other departments.

Explosion proof motor

Explosion-proof motors are mainly used in coal mine, petroleum and natural gas, petrochemical and chemical industries.In addition, in the textile, metallurgy, urban gas, transportation, grain and oil processing, papermaking, medicine and other sectors are also widely used.Explosion-proof motor as the main power equipment, usually used to drive pumps, fans, compressors and other driving machinery.

According to the explosion-proof principle, motors can be divided into flameproof motors, safety-increasing motors, positive pressure motors, spark-free motors and dust explosion-proof motors.

The explosion concept

In a very short time, a large amount of energy is released, resulting in high temperature and a large amount of gas, resulting in a high pressure chemical reaction or state change in the surrounding medium.Rapid release of energy, the surrounding objects will be subjected to violent impact and destruction.

Explosion proof motor

Explosive substances: substances that can react with oxygen (air), including gases, liquids, and solids.(gas: hydrogen, acetylene, methane, etc.Liquid: alcohol, gasoline;Solid: dust, fiber dust, etc.)2) oxygen: air.3) ignition source: including open flame, electrical spark, mechanical spark, electrostatic spark, high temperature, chemical reaction, light energy, etc.

Explosion-proof reason

Explosive materials: many production sites will produce some combustible materials.Explosive substances are found in about two-thirds of underground coal mines.In the chemical industry, about 80 percent of the workshop area has explosive substances.Oxygen: oxygen is ubiquitous in the air.Ignition source: in the production process, a large number of use of electrical instruments, a variety of friction spark, mechanical wear spark, electrostatic spark, high temperature and other inevitable, especially when the instrument, electrical failure.Objectively, many industrial sites meet the explosion conditions.When the mixture concentration of explosive substance and oxygen is within the explosion limit, if there is an explosion source, an explosion will occur.Therefore, it is necessary to adopt explosion-proof.

Explosion proof motor

Motor explosion-proof grade consists of three parts

1) classify the use safety level of different electrical equipment in explosive gas area (zone 0, zone 1, zone 2).For example, the selection of rotating motor is divided into flameproof type (code d), positive pressure type (p), increased safety type (e) and spark-free type (n).

2) gas or steam explosive mixture grade division, is divided into A and B Ⅱ Ⅱ, Ⅱ C three, these grades division is mainly in accordance with the maximum experimental safe gap (MESG) or (MICR) to differentiate between the minimum ignition current.

3) classification of ignition temperature of a certain medium.T1-450℃<T, t2-300 <T≤ 450℃, t3-200 <T≤300℃, t4-135 <T≤200℃, t5-100 <T≤135, t6-85 <T≤100℃.

Protection grade:

0 no test shall be conducted without special protection of the non-protective motor, but it shall conform to article 2.1

Explosion proof motor

the explosion proof motor with the protection of more than 50MM solid can prevent a large area of human body from accidentally touching or approaching the live or rotating parts in the shell.It can prevent solid foreign bodies larger than 50MM in diameter from entering the shell

2. the explosion proof motor with a solid diameter greater than 12MM can prevent solid foreign bodies with a diameter greater than 12MM from entering the shell

3. the explosion proof motor with a solid diameter greater than 2.5mm can prevent the tool or wire with a diameter greater than 2.5mm from touching or approaching the live or rotating parts in the shell

Explosion proof motor

A motor with a solid diameter of more than 1MM can prevent wires or strips with a diameter or thickness of more than 1MM from touching or approaching live or rotating parts in the shell

The dustproof motor should bear no harmful effect when splashing water in any direction

0 no protective motor no special protection

There should be no harmful effect on the vertical dripping of the drip proof motor

When the explosion proof motor is tilted from the normal position to any Angle within 15 degrees in any direction, the vertical dripping shall have no harmful effect

3 the spray motor and vertical line into a 60 degree Angle range of the spray should be no harmful effects

The splash proof motor should bear no harmful effect in any direction

The water-proof motor should bear no harmful influence of water spraying in any direction

Explosion proof motor

When the anti-wave motor is subjected to violent wave impact or strong water spraying, the explosion proof motor's water intake should not reach a harmful degree.

When the explosion proof motor immersed in the specified pressure of the water after the specified time, the explosion proof motor into the water should not reach the harmful degree

Submersible motor the explosion proof motor can be submersible for a long time under the conditions specified by the manufacturer.the explosion proof motor is generally watertight and may allow water in to some types of motor, but should not reach a harmful level

Danger classification editing

Zone 0: explosive gas always or for a long time

Zone 1: flammable gas may occur or exist during normal operation

Zone 2: in general, flammable gases are not present and, if they do occur occasionally, they exist only for a short time

Classification of explosive area, comparison between international standard and American standard

Explosion proof motor

I.E.C. N.E.C.

Gas Zone 0 Class I, Division I

Zone 1 Class I, Division I

Zone 2: Class I, Division II

Dust Zone 10 Class II, Division I

Zone 11, Class II, Division II

I.E.C. : Internaional Electrotechnical Commission

N.E.C. : National Electrical Code, U.S.A.

Under normal conditions, explosive dust or combustible fiber and air mixture cannot appear, only under abnormal conditions, occasionally or for a short time

2. The rated voltage, rated current, power, and speed are the same as those for ordinary motors. The difference is that the explosion-proof electric motor has more explosion-proof signs: Ex

First, the explosion-proof type + equipment category + (gas group) + temperature group explosion-proof type:

  1. Flameproof type Ex d2. Sand filling type Ex q3. Increased safety type Ex e4. Pouring type Ex m5. Positive pressure type Ex p

6.n type Ex n7. intrinsically safe type E x ia Ex ib8. special type Ex s9. oil immersion type Ex o10. dust explosion-proof type DIP A DIP B2

Explosion proof motor

Can be divided into the coal mine conveyor with explosion-proof motor, coal mine hoist with explosion-proof motor, rock loader use explosion-proof motor, coal mine local fan used explosion-proof motor, valve with explosion-proof motor, fan with loud explosion-proof motor, Marine explosion-proof motor, lifting metallurgical explosion-proof type and hydrogenation device matching with increased safety brushless excitation synchronous motor, etc.In addition, according to rated voltage, efficiency and other technical indicators to be divided, such as high-voltage explosion-proof motor, high-efficiency explosion-proof motor, high-slip explosion-proof motor and high-start torque explosion-proof motor.

The basic series of low-voltage flameproof motor widely used in China is YB series flameproof three-phase asynchronous motor, which is a derivative of Y series (IP44) three-phase asynchronous motor.Explosion-proof performance conforms to GB3836.1 -- 83 "general requirements for explosion-proof electrical equipment for explosive environment" and GB3836.2-83 provisions of flameproof electrical equipment for explosive environment flameproof electrical equipment;the explosion proof motor power range is 0.55 -- 200kW, and the corresponding frame number range is 80 -- 315nun;The explosion-proof marks are dI, dIIAT4 and dIIBT4, which are respectively applicable to the places of explosive mixture formed by combustible gas or vapor and air in underground coal mine with fixed equipment or factories of IIA and IIB grade and temperature group t1-t4.The protective grade of the main shell is IP44, which can also be made into IP%4, and the protective grade of the junction box is IP54.Rated frequency is 50Hz, rated voltage is 380, 1660, 1140, 380/660, 660/140v;The insulation grade of the explosion proof motor is F, but the temperature rise of the stator windings is assessed according to B, which has a large temperature rise margin.The main models of the derivation series of low-voltage flameproof three-phase asynchronous motor are:YB series (dIIcT4) (80-315 mm high stand center for), YBSO series (small power, high stand center at 63-90 mm), YBF series (blower, high stand center at 63-160 mm), YB - H series (Marine, high stand center for 80 ~ 280 mm), YB series (medium-sized, high stand center at 355-450 mm), YBK series (coal use, high stand center at 100-315 mm), YB - W, B - TH, YB - WTH series (80-315 - mm) high stand center for,YBDF -- WF series (for outdoor anti-corrosion flameproof electric valve, the height of the frame center is 80-315mm), YBDC series (flameproof capacitor starts single-phase asynchronous motor, the height of the frame center is 71-100mm) and YBZS series flameproof two-speed three-phase asynchronous motor.In addition, there are YB series high-voltage flameproof three-phase asynchronous motors (frame center height is 355~450mm, 560 -- 710mm).The industry jointly designed YB2 series has passed the national appraisal at the end of 2014, which will gradually replace YB series and become the basic series of flameproof three-phase asynchronous motors in China.YB2 series has 15 frame sizes (frame center height is 63, 355nmm), power range is 0.12 -- 315kW

Explosion proof motor

3. Explosion-proof electric motors equipment category:

Electrical equipment for explosive gas environment is divided into:

YB2 low pressure explosion-proof motor

YB2 low pressure explosion-proof motor

Class I: Electrical equipment used in coal mines;

Class II: Electrical equipment for other explosive gas environments other than coal mines.

Class II flameproof "d" and intrinsically safe "i" electrical equipment are further classified into IIA, IIB, and IIC.

Electrical equipment for flammable dust environment is divided into: Type A dusttight equipment; Type B dust tight equipment.

YB-3phase explosion proof electric motor Power Voltage Current HZ. Speed M odel number (kW) (HP) (V) (A) (Hz) (r/min) 3000r/min 2pole YB-801-2 0.75 1 380 1.8 50 2840 YB-802-2 1.1 1.5 380 2.6 50 2840 YB-90S-2 1.5 2 380 3.4 50 2850 YB-90L-2 2.2 3 380 4.8 50 2850 YB-100L-2 3 4 380 6.2 50 2870 YB-112M-2 4 5.5 380/660 8.1/4.7 50 2890 YB-132S1-2 5.5 7.5 380/660 11.1/6.3 50 2900 YB-132S2-1 7.5 10 380/660 14.8/8.6 50 2900 YB-160M1-2 11 15 380/660 21.6/12.5 50 2940 YB-160M2-1 15 20 380/660 28.8/16.6 50 2940 YB-160L-2 18.5 25 380/660 35.5/20.5 50 2940 YB-180M-2 22 30 380/660 41/23.7 50 2950 YB-200L1-2 30 40 380/660 55.5/32.1 50 2950 YB-200L2-2 37 50 380/660 67.9/39.2 50 2950 YB-225M-2 45 60 380/660 82.1/47.4 50 2960 YB-250M-2 55 75 380/660 99.7/57.5 50 2970 YB-280S-2 75 100 380/660 134.4/77.5 50 2970 YB-280M-2 90 125 380/660 160.2/92.5 50 2970 YB-315S-2 110 154 380/660 195.4/112.5 50 2980 YB-315M-2 132 184 380/660 233.2/134.3 50 2980 YB-315L1-2 160 222 380/660 279.3/160.8 50 2980 YB-315L2-2 200 279 380/660 348.4/200.6 50 2980 1500r

Explosion proof motorExplosion proof motor

YB-801-4 0.55 0.75 380 1.5 50 1390 YB-802-4 0.75 1 380 2 50 1390 YB-90S-4 1.1 1.5 380 2.9 50 1390 YB-90L-4 1.5 2 380 3.7 50 1390 YB-100L1-4 2.2 3 380 5.1 50 1420 YB-100L2-4 3 4 380 6.8 50 1420 YB-112M-4 4 5.5 380/660 8.8/5.1 50 1430 YB-132S-4 5.5 7.5 380/660 11.5/6.7 50 1440 YB-132M-4 7.5 10 380/660 15.4/8.9 50 1440 YB-160M-4 11 15 380/660 22.3/12.9 50 1460 YB-160L-4 15 20 380/660 30.1/17.4 50 1460 YB-180M-4 18.5 25 380/660 36.5/21.1 50 1470 YB-180L-4 22 30 380/660 43.1/24.9 50 1470 YB-200L-4 30 40 380/660 57.6/33.3 50 1470 YB-225S-4 37 50 380/660 69.9/40.3 50 1480
YB-225M-4 45 60 380/660 84.7/48.9 50 1480 YB-250M-4 55 75 380/660 102.7/59.3 50 1480 YB-280S-4 75 100 380/660 139.6/80.6 50 1480 YB-280M-4 90 125 380/660 166.9/96.3 50 1480 YB-315S-4 110 154 380/660 198.7/114.4 50 1485 YB-315M-4 132 184 380/660 237.7/136.9 50 1485 YB-315L1-4 160 222 380/660 284.3/163.7 50 1485 YB-315L2-4 200 279 380/660 354.7/204.2 50 1485 1000r/min 6pole YB-801-6 0.37 0.5 380 1.3 50 890 YB-802-6 0.55 0.75 380 1.7 50 890 YB-90S-6 0.75 1 380 2.3 50 910 YB-90L-6 1.1 1.5 380 3.1 50 910 YB-100L-6 1.5 2 380 3.9 50 930 YB-112M-6 2.2 3 380 5.6 50 940 YB-132S1-6 3 4 380 7.3 50 970 YB-132S2-6 4 5.5 380/660 9.4/5.4 50 970 YB-160M1-6 5.5 7.5 380/660 12.6/7.2 50 970 YB-160M2-6 7.5 10 380/660 16.8/9.7 50 970 YB-160L-6 11 15 380/660 24.3/14 50 970 YB-180M-6 15 20 380/660 31.6/18.3 50 980 YB-200L1-6 18.5 25 380/660 37.6/21.7 50 980 YB-200L2-6 22 30 380/660 44.7/25.8 50 980 YB-225M-6 30 40 380/660 57.6/33.3 50 980 YB-250M-6 37 50 380/660 69.8/40.3 50 980 YB-280S-6 45 60 380/660 85.9/49.6 50 990 YB-280M-6 55 75 380/660 104.7/60.5 50 990 YB-315S-6 75 100 380/660 141.7/81.6 50 990 YB-315M-6 90 125 380/660 169.5/97.6 50 990 YB-315L1-6 110 154 380/660 206.7/119 50 990 YB-315L2-6 132 184 380/660 244.7/140.9 50 990 750r/min 8pole YB-801-8 0.18 0.25 380 0.8 50 650 YB-802-8 0.25 0.34 380 1.1 50 650 YB-90S-8 0.37 0.5 380 1.4 50 670 YB-90L-8 0.55 0.75 380 2.1 50 670 YB-100L1-8 0.75 1 380 2.4 50 690 YB-100L2-8 1.1 1.5 380 3.3 50 690 YB-112M-8 1.5 2 380 4.4 50 690 YB-132S-8 2.2 3 380 5.6 50 710 YB-132M-8 3 4 380 7.6 50 710 YB-160M-8 4 5.5 380/660 10.3/5.9 50 720
YB-160L-8 5.5 7.5 380/660 13.4/7.8 50 720 YB-180M-8 7.5 10 380/660 17.5/10.1 50 720 YB-180L-8 11 15 380/660 25.3/14.6 50 730 YB-200L-8 15 20 380/660 33.7/19.5 50 730 YB-225S-8 18.5 25 380/660 40/23.1 50 740 YB-225M-8 22 30 380/660 47.4/27.3 50 740 YB-250M-8 30 40 380/660 63.4/36.6 50 740 YB-280S-8 37 50 380/660 77.8/44.9 50 740 YB-280M-8 45 60 380/660 94.1/54.3 50 740 YB-315S-8 55 75 380/660 111.2/64 50 740 YB-315M-8 75 100 380/660 151.3/87.1 50 740 YB-315L1-8 90 125 380/660 177.8/102.4 50 740 YB-315L2-8 110 154 380/660 216.8/124.8 50 740 600r/min 10pole YB-315S-10 45 60 380/660 99.1/57.1 50 585 YB-315M-10 55 75 380/660 121.1/69.7 50 585 YB-315L1-10 75 100 380/660 162.1/93.3 50 585 YB-315L2-10 90 125 380/660 191/110 50 585

Explosion proof motor

Explosion-proof motors are mainly used in coal mine, petroleum and natural gas, petrochemical and chemical industries.In addition, it is also widely used in textile, metallurgy, urban gas, transportation, grain and oil processing, papermaking, medicine and other sectors [2].

The rated voltage, rated current, power and speed of the explosion-proof motor are the same as those marked by the ordinary motor.The difference is that the explosion-proof motor has more explosion-proof mark: Ex.

I. explosion-proof type + equipment type + (gas group) + temperature group explosion-proof type:

Explosion proof Ex d2. Sand filling Ex q3. Safety increasing Ex e4

6. N-type Ex n7. N-type Ex ia Ex ib8. Special type Ex s9. Oil-immersed type Ex o10

Ii. Equipment category

Electrical equipment for explosive gas environment is divided into:

Class I: electrical equipment for underground coal mine;

Class II: electrical equipment for explosive gas environments other than coal mines.

Class II flameproof type "d" and intrinsically safe type "I" electrical equipment are classified into IIA, IIB, and IIC.

Electrical equipment for combustible dust environment can be divided into: type A dust-tight equipment;B type dust tight equipment.

Explosion proof motor

Temperature group: ignition temperature of t1-t6 combustible gas the highest temperature of electrical equipment T1 T>450 ℃ T2 450℃ T>300℃ T3 300℃ T> T>200℃ T4 200℃>T>135℃ T5 135℃ T6 100℃> 100℃ T6 100℃>T >0 85℃ development with the development of science and technology and production, there is an increasing risk of explosion places.For example, the production of edible oil used to use the traditional squeeze process. After the 1970s, China began to introduce foreign advanced oil extraction process, but this process requires the use of chemical solvents containing hexane, hexane is flammable and explosive substances;Therefore, the oil extraction workshop becomes an explosive dangerous place, which requires the use of explosion-proof motors and other explosion-proof electrical products.For example, the rapid development of our country's highway, a large number of fuel gas stations appear, also provides a new market for explosion-proof motors.

Explosion proof motor

4. With the development of science and technology and production, the places where there is a danger of explosion are also increasing. For example, the production of edible oil used to be a traditional pressing process. After the 1970s, China began to introduce advanced foreign leaching oil technology. Therefore, the leaching oil workshop became a dangerous place for explosion, and it required the use of explosion-proof electric motorand other explosion-proof electrical products.

Explosion proof motor

5. Main applications of explosion-proof electric motorinclude fans, blowers, crushers, conveyor systems, factories, cranes and other applications requiring explosion-proof motors.

Explosion proof motor

Edits of sparkless motor

It is a motor that does not ignite the explosive mixture around it under normal operating conditions and generally does not cause ignition failure.Compared with increased safety type motor, in addition to the insulation dielectric strength test voltage, winding temperature rise, te (at ambient temperature reached highest rated running after the final temperature of ac winding, since started by starting current meter to temperature rise to the limit of time) and starting current than not like increased safety type has special provisions, and other aspects to add safety type motor design requirements.

Spark-free motor conforms to GB3836.1-83 and GB3836.8 -- 87 provisions of "n" for explosion-proof electrical equipment without spark for explosive environment.The design pays attention to the sealing measures of the explosion proof motor. The protection grade of the main shell is IP54 and IP55, and the junction box is IP55.For motors with rated voltage above 660V, the connecting parts of space heater or other auxiliary devices shall be placed in a separate junction box.

Explosion proof motor

YW series spark-free motor products (frame center height is 80~315mm) have been developed and produced in China.The explosion-proof mark is nIIT3, which is applicable to the factory with the explosive mixture of flammable gas or vapor and air in the temperature group t1-t3.The rated frequency is 50Hz, and the rated voltage is 220, 380, 660 and 380/660v. the explosion proof motor adopts F insulation, but the temperature rise limit of stator windings is assessed according to class B, which has a large temperature rise margin and high safety reliability. The power is 0.55~200kW.

Edit dust explosion-proof motor

It refers to the explosion proof motor whose shell is designed and manufactured in accordance with specified conditions, which can prevent dust from entering into the explosion proof motor shell or cannot completely prevent dust from entering, but the amount of dust entering does not interfere with the safe operation of the explosion proof motor, and the accumulation of internal dust is not easy to cause ignition hazard, and when used, it will not cause explosion of surrounding explosive dust mixture.

Its main features are:

(1) the shell has a high sealing property to reduce or prevent dust from entering the shell, and even if it does, its entering amount will not cause ignition hazard.

(2) control the maximum allowable temperature of the shell surface not to exceed the specified temperature group.It has been used in the mechanization equipment of the national grain reserve.The national standard of dust explosion-proof electrical equipment is GBl2476.1 -- 90 explosion-proof electrical equipment for explosive dust environment.

Explosion proof motor

Mine explosion-proof motor

(1) development of high-power motor: the largest installed capacity of the shearer in the world has exceeded 1200kw, and the power of its driving motor is up to 600kW;The maximum installed capacity of the scraper conveyor in the working face of the corresponding mining area has exceeded 1500kW, and the power of its driving motor has reached 725kW.The maximum power of the driving motor of the domestic shearer is 400kW, and the maximum power of the driving motor of the scraper conveyor is 315kW.

(2) the development of mining motors with 3.3kv, 6kV and 10kV voltages: this is because the trend of mining area lengthens after the popularization of comprehensive mechanized coal mining units, resulting in an increase in voltage drop. At the same time, the use of high-power motors also requires an increase in voltage level.

(3) development of double-speed motor for mining: in order to adapt to the work needs of low-speed starting and high-speed operation of coal mine conveyors, foreign mining scraper conveyors are driven by double-speed motor.The power range, performance index and the performance of matching control switch of the domestic double-speed motor for mining are different from the foreign advanced level.

(4) improve the reliability of the mine motor: the explosion-proof mine motor has poor working conditions, such as frequent high-load starting of the explosion proof motor, large load variation, large voltage fluctuation, high ambient temperature and certain corrosiveness, which all affect the reliability and life of the explosion proof motor.

(5) accelerate the upgrading of explosion-proof motor for mining.

(6) unify the standard of explosion-proof motor for mining.

Explosion proof motor

Explosion-proof motors for petrochemical systems

(1) the demand of increased safety type and spark free type motor will be on the rise.Users of petrochemical systems in practice;The necessity of developing safety - increasing and spark - free motors in China has been recognized.

(2) reliability of explosion-proof motor has been paid more and more attention by users of petrochemical system.With the development of large-scale plant and continuous operation in petrochemical enterprises, the system operation is required to realize long cycle, maintenance free or less maintenance.Therefore, the explosion-proof motor has become the key equipment to ensure the above requirements.

(3) explosion-proof and high-efficiency variable frequency speed regulating motor have become energy-saving products that petrochemical users urgently need to develop.Explosion-proof motor energy saving has two aspects of work: one is to develop high-efficiency explosion-proof motor products, the other is to develop a large number of explosion-proof motor special products, especially the fan, pump and compressor with great potential for energy saving motor design for speed regulating motor.

Explosion proof motor

(4) new requirements brought by the development of coastal petrochemical enterprises.A number of refineries will be built along the coast of China. Crude oil needs to be imported, and the imported crude oil has high sulfur content and serious corrosion.In addition, all imported crude oil needs to be transported by sea, and its storage tanks need to be equipped with explosion-proof motors for high-lift and large-flow oil pumps.

(5) the great development of the oil industry in western China requires the development of explosion-proof motor products suitable for the dry and hot desert environment.The market demand of large capacity increased safety brushless excitation synchronous motor used in hydrogenation equipment will increase year by year.

Explosion proof motor

There are many kinds of explosion-proof motors. In the environment of explosive dangerous area, to ensure safe production, the selection of explosion-proof motors is very important.When choosing the explosion-proof motor, it is necessary to have a certain understanding of its explosion-proof performance. Only when choosing the appropriate explosion-proof motor can the safety of use be guaranteed and no resources are wasted

Christine Zhu ( Sales Department; Miss. )          

NER GROUP CO.,LIMITED                            
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Date

06 September 2019

Tags

AC Motor

 sogears manufacturing

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