What is a explosion proof type electric actuator?
Why does the explosion happen?
Explosion is the change of matter from one state, through physical or chemical changes, to another state suddenly, and a huge amount of energy is released. The energy released at a rapid speed will cause the surrounding objects to be violently impacted and destroyed. Three conditions must be met for an explosion: explosive substances, oxygen, and ignition source. Objectively, many industrial sites meet the explosion conditions. When the mixed concentration of explosive substances and oxygen is within the explosion limit, an explosion will occur if there is an explosion source.
What is explosion proof?
The prevention of explosion must be considered from the above three necessary conditions, limiting one of the necessary conditions will limit the explosion. Electrical equipment is also a potential source of ignition, resulting in elevated surface temperatures, electrostatic discharge, or sparks caused by transient currents when the machine is running. By design, flameproof electrical equipment can enclose the ignitable explosive mixture in an outer casing, which is particularly strong, can withstand the explosion pressure of the explosive mixture inside, and prevent the explosive mixture from spreading to the outside of the casing. Therefore, flameproof electrical equipment can be prevented from being a potential ignition source.
How to achieve explosion-proof?
The explosion-proof electric actuator must be produced in accordance with the ISO 9001 quality system standard. The explosion-proof function is designed and produced in accordance with the national electrical explosion-proof standards GB3836.2 (gas explosion-proof) and GB12476 (dust explosion-proof) and has passed explosion-proof certification. Domestic must obtain: "China National Compulsory Product Certification", "Explosion-proof Certificate", and foreign export also need to obtain relevant explosion-proof certification: "IECEX", "ATEX", "Customs Union CU-TR Explosion-proof Certification".
This type of explosion-proof electric actuator can withstand the internal explosion of a flammable mixture that has entered the interior of the housing without damage, and will not ignite through any joints or holes in the housing by one or more gases or vapors The enclosure of electrical equipment that forms an external explosive atmosphere.
The explosion-proof level of FRY explosion-proof series electric actuator is: ExdⅡBT4Gb
Ex - Explosion proof identification
D - Explosion Proof or Explosion Proof - Equipment type represents electrical equipment designed for explosive gas atmospheres other than coal mines
B - the size of the explosion, which determines the dimensions (width and clearance) of each fire joint of the actuator;
T4 - Temperature class represents the maximum allowable surface temperature of the actuator of 135°C Gb - Protection class standard
Hazards of counterfeit explosion-proof products
Nowadays, there are many fine smartelectric actuators pseudo-explosion- proof/explosion-proof products on the market, which are extremely harmful. Sparks, arcs or dangerous temperatures are generated in places containing flammable and explosive gases and dust such as coal, petroleum and chemical industry. , the flame of the explosion inside the equipment will be transmitted to the outside of the shell, and it will directly contact with the external flammable and explosive gas mixture, which will cause fire and gas or coal dust explosion and cause major vicious accidents. Therefore, this article teaches you how to distinguish the true and false explosion-proof electric actuators.
Classification of explosion-proof electrical equipment
Intrinsically safe electrical equipment:
Electrical equipment whose all circuits are intrinsically safe circuits is called intrinsically safe electrical equipment. The so-called intrinsically safe circuit refers to a circuit that cannot ignite an explosive mixture under specified conditions, under normal operation or under specified fault conditions, by generating sparks and thermal effects. The symbol of this type of equipment is "i" (divided into ia, ib).
Increased safety electrical equipment: High-temperature electrical equipment that does not produce arcs, sparks, or the possibility of igniting explosive mixtures under normal operation, with measures taken in its construction to improve safety to avoid arcs, sparks, or the possibility of igniting explosive mixtures under normal or prescribed overload conditions The electrical equipment is called increased safety electrical equipment. This type of equipment is marked with an "e".
Explosion proof electrical equipment: Electrical equipment with flameproof enclosures is called flameproof electrical equipment. The flameproof shell can not only withstand the explosion pressure generated by the detonation of the internal mixed gas, but also prevent the internal explosion flame and high temperature gas from breaking out of the flameproof gap to ignite the explosive mixture around the shell. This type of equipment is marked with a "d".
Explosion proof type Electric Actuator
The explosion-proof grade of FRY series fine and small explosion-proof electric actuators produced by our company is: Exd IIC T5Gb; Note: It can be used in environments where Exd IIC T4Gb, Exd IIB T5Gb and Exd IIB T4Gb are lower than Exd IIC T5Gb.
Lower than Exd IIC T5Gb
The explosion proof electric actuator produced by our company is designed to prevent the internal spark or the explosion carrier from contacting the outside through the flameproof surface of the shell. Face width (12.5mm-25mm) to ensure this. In addition, the joint surfaces of each component, such as the number of thread turns, thread accuracy, zero point, between screws, finger windows and the housing, between the motor and the output port, the gap between the components and the components, and the wire port, etc., are all explosion-proof Design is required so that the high pressure generated by the internal explosion will not damage the actuator.
parameters
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