1, Y- stands for "different" stepping motors.
2.b stands for "explosion"
Yb-stands for explosion-proof asynchronous motor.
4.A- stands for increased safety.
5. YA- stands for increased safety asynchronous motor.
6. F stands for "ventilation" and "dust". For example, YBF stands for flameproof asynchronous motor for fans.
YFB stands for dust-proof and explosion-proof motor.
7.s stands for "water" cooling and "conveying" motor.
For example, YBS stands for flameproof asynchronous motor for conveyor, and YSS stands for water-cooled flameproof asynchronous motor for conveyor.
8.EExp: positive pressure type;
9.EExd: flameproof type
10, EExde: explosion-proof and safety-enhancing type;
1 1, EExe: increased safety type;
12, EExnA: spark-free explosion-proof type;
13, CEI:IEC: International Electrotechnical Commission
14, EExd: explosion-proof motor
15, EExe: increased safety motor
Flameproof motor (EExd) and increased safety motor (EExe) are the two most commonly used types of explosion-proof motors, and the application environment area of EExd is larger than that of EExe.
Importance of temperature classes T3, T4, T5 and T6.
If the model of the mine explosion-proof motor we buy is YBK2 mine explosion-proof three-phase asynchronous motor. If we only know these data, we can't determine the specific model of explosion-proof motor. We still know these data when choosing explosion-proof motor according to the model of explosion-proof motor:
1. Motor power;
2. Rated speed;
3. Voltage grade;
4. Explosion-proof grade;
5. Install the form.
For example:
Model description of YBk2-450-2-2kW explosion-proof motor.
Y: asynchronous motor b: flameproof.
K: Mine explosion-proof motor 2: Improved design serial number
450: Axis height (450mm) 2: Core length code (No.2 core)
2: Number of poles
W: environmental specification (outdoor)
Representative significance of YB2 explosion-proof motor symbol;
EX: mark (explosion-proof) D: explosion-proof type of electrical equipment (flameproof type)
IIB: electrical equipment category level (Class II, Class B, T4: temperature group (T4)
The installation method of YBk2-450-2-2kW is as follows:
B3 (horizontal foot connection)
B5 (vertical flange connection)
B35 (vertical and horizontal, with leg flange)
Related knowledge recommendation:
Complete set of explosion-proof motor models
Selection of explosion-proof motor
Selection of mine explosion-proof motor
YB2 and YB3 explosion-proof motors were designed and patented by CNEX Nanyang Explosion-proof Electric Research Institute, and now YB2 explosion-proof motors are gradually withdrawing from the market.
From Nanyang Zhongtian explosion-proof
Question 2: What does the explosion-proof motor model mean? Model description of YB2 series:
Question 3: What does the explosion-proof mark Exd of explosion-proof motor mean? Ex stands for explosion-proof type and d stands for explosion-proof type.
From Nanyang Zhongtian explosion-proof
Question 4: What do explosion-proof motors and safety booster motors mean? China's explosion-proof grade standard is GB3836. 1-2000 Electrical Equipment for Explosive Gases, which will be supplemented or modified by the following special standards for explosion-proof types.
GB 3836.2 electrical equipment for explosive gas environment part 2: flameproof type d.
GB 3836.3 Electrical equipment for explosive gas atmospheres Part 3: Increased safety type E
GB 3836.4 Electrical equipment for explosive gas environment Part 4: Intrinsically safe type I.
GB 3836.5 Electrical equipment for explosive gas environment Part 5: Positive pressure type P
GB 3836.6 Electrical equipment for explosive gas atmospheres Part 6: Oil-filled type O
GB 3836.7 electrical equipment for explosive gas environment part 7: sand filling q.
GB 3836.9 Electrical equipment for explosive gas atmospheres Part 9: M-type pouring seal
GB 7957 mine safety helmet lamp
The above standards and this standard are not applicable to medical electrical equipment, detonators, detonator testers and ignition circuit testers.
As for the EX2DB4 you mentioned, I really haven't seen a standard similar to yours. I suspect that you copied this model or symbol by mistake.
The common symbols are EXD Ⅰ/Ⅱ BT3.
Ex is a universal symbol, which means explosive (this article is for personal understanding)
D means that the secondary explosion-proof type is flameproof type D.
Ⅰ or Ⅱ indicates the classification of electrical equipment, Ⅰ refers to electrical equipment used in coal mines, and Ⅱ refers to equipment used in explosive gas environment except coal mines. Among them, Class II flameproof D "and intrinsically safe I" electrical equipment can be divided into Class IIA, Class IIA, Class IIA, Class IIA and Class IIA.
T3 stands for temperature group.
See GB3836. 1-2000-2000 Electrical Equipment for Explosive Gases for specific classification and meaning.
First, the concept of explosion protection
1, three necessary conditions for explosion, and three conditions at the same time-explosion.
Energy required to ignite the migration source; ; Air or oxygen air or oxygen; Flammable air flammable dust
2, to prevent explosion must be considered from three necessary conditions, limiting one of the necessary conditions will limit the explosion.
In the industrial process, flammable and explosive situations are usually handled from the following three aspects.
1) to prevent or minimize the possibility of leakage of flammable substances;
2) Do not use or use as little as possible electrical components that are prone to electric sparks;
3) Nitrogen filling is adopted to keep the inert state.
Second, the classification of dangerous areas and explosion-proof classification of electrical components and allowable temperature areas
1, hazardous area classification
Zone 0: explosive gas always exists or exists for a long time.
1( 1 zone): combustible gas may appear or exist during the work of the instrument side.
Zone 2: In general, there is no combustible gas, and even if it happens occasionally, free radicals exist for a short time.
Classification of explosion areas, comparison between international standards and American standards
Indian engineering company
Gas zone class 0 I, zone I
Area 1 level 1, area 1
Zone 2, level I, zone II
Dust area 10 level 2, area 1
Area 1 1 level 2, area 2
International electrician task.
Noun (abbreviation of Noun) E.C.: American Electrical Code (National Electrical Standard ... > >
Question 5: What is the meaning of "MA" on the explosion-proof motor? Horse is the national coal mine safety certification mark.
Question 6: What is the working principle of explosion-proof motor? When the three-phase asynchronous explosion-proof motor is connected to three-phase alternating current, the above two processes must be completed at the same time. The winding of three-phase alternating current will produce a rotating magnetic field, for example, the four-pole winding will produce four closed magnetic circuits. This closed loop will pass through the air gap, through the loss of rotor core, and then back to the closure of stator core. The rotating speed of the rotating magnetic field is n 1=60f/p(r/min), which also supports the synchronous rotating speed of the explosion-proof motor, where f: power frequency, Hz; P: polar logarithm. Under the action of rotating magnetic field, the rotor bar cuts the magnetic field lines and generates induced current to complete the first process. The rotor guide rod of the undercurrent will be pulled by the magnetic field in the magnetic field, and the second process is completed. The rotor of the explosion-proof motor rotates due to the tension of the guide rod, and the speed is n. If n=n 1, there is no cutting magnetic field line between the conductor and the rotating magnetic field, so no induced current will be generated, the conductor will not get the tension of the magnetic field, and the rotor will not rotate. That is to say, the rotor cuts the magnetic field lines with the difference of N < N 1, and generates induced current, which is pulled and rotated by the rotating magnetic field. Without this "abnormality", it can't work, so it is called asynchronous motor.
Question 7: What does the explosion-proof grade B4T5 of explosion-proof motor mean? The group name stands for gas or dust.
acetylene
hydrogen
ethylene
propane
E metal dust
F coal dust
Grain dust
Gas temperature group division:
The surface temperature of an object with a safe temperature group is a common explosive gas.
T 1 ≤ 450℃ 46 kinds of hydrogen and acrylonitrile.
47 kinds of acetylene and ethylene with T2 ≤ 300℃.
36 Kinds of Gasoline and Crotonaldehyde with T3 ≤ 200℃
T4 ≤ 135℃ acetaldehyde, tetrafluoroethylene, etc.
T5 ≤ 100℃ carbon disulfide
T6 ≤ 85℃ Ethyl nitrate and Ethyl nitrite
Question 8: The explosion-proof motor is 4-pole, IP55, class F.. What do these parameters mean? 4 poles represent the number of magnetic poles of the motor.
IP55 stands for totally enclosed protection level.
Class F indicates the insulation level of the motor Dan shell.
Question 9: What does the explosion-proof motor exdimb mean? Explosion-proof motors generally include: flameproof type, increased safety type and spark-free type.
Your explosion-proof sign is incomplete,
Question 10: What does the threaded interface of explosion-proof motor tube mean? The remote 15 class 20 12-03- 14 is an explosion-proof motor connected with the power supply iron pipe through explosion-proof pipes, and both ends of the explosion-proof pipe are connected with the motor and the line iron pipe through pipe threads. Question: I have bought a motor as a bell mouth now, and the customer's requirement must be a pipe thread interface. What should I do? ), and the other end screws the iron pipe on the threaded head, so that the two ends of the explosion-proof pipe can be connected through the flexible joint of the explosion-proof pipe. Follow-up: the customer said that this threaded interface on the motor is available in the market, so just buy one and send it for installation, but after asking for a long time, I didn't get an answer: our unit is an explosion-proof motor, which does this. The interface of the explosion-proof motor is threaded, so we have to re-match the explosion-proof tube according to the diameter of the explosion-proof motor and the iron tube.