1, explosion-proof safety
In normal operation does not produce sparks, arcs or dangerous temperatures, can improve the safety of electrical equipment.
2, explosion-proof
The structure of the fully enclosed, even if the electrical equipment in the internal explosion, but also will not detonate to ignite the external explosive gases, thus eliminating the risk of fire and explosion. Explosion-proof motor is this structure.
3, explosion-proof oil-filled
The main sparks, arcs or dangerous temperatures may become a source of ignition of electrically charged parts immersed in oil, so that the external combustible gases do not produce a fire explosion of electrical equipment.
4, explosion-proof ventilated inflatable
Internally filled with air or inert gas, and keep it at a positive pressure to prevent external combustible gases into the internal electrical equipment.
5, explosion-proof safety spark type
In the circuit system, the electrical spark generated by the normal conditions, do not lead to ignition of explosive gases in electrical equipment. The equipment is divided into Ⅰ, Ⅱ, Ⅲ level according to the minimum detonation current. This explosion-proof electrical equipment current limit is very small, used for instrumentation and communication.
6, explosion-proof special type
This structure does not belong to the above types, but the use of other explosion-proof measures for electrical equipment.
Explosion-proof electrical equipment common signs
1, sign d
This means that the electrical equipment of the explosion-proof shell can withstand has entered the shell of the internal explosion of combustible mixtures without damage, and through the shell of any joint surface or structure of the hole will not ignite one or more gases.
2, mark e
This means that the electrical equipment will not produce arcs and sparks under normal operating conditions, it can prevent dangerous temperatures, arcs or sparks phenomena in internal and external components.
3, the sign i
This refers to a particular explosion-proof electrical system, rather than to a particular piece of equipment. Such a system has any spark or any thermal effect generated under the specified conditions, can not ignite the specified explosive gas environment.
Selection of explosion-proof electrical equipment what skills
1, explosion-proof electrical equipment should be based on the level of explosion hazardous areas and explosion hazardous substances to determine the level of electrical equipment and group selection.
2, in the level 0 area is only permitted to use ia level intrinsically safe equipment and other electrical equipment designed especially for the level 0 area. 3, gas explosion hazardous areas of explosion-proof electrical equipment selection should be based on different gas hazards.
4, dust explosion hazardous areas of explosion-proof electrical equipment selection, there is no stereotyped products, in order to ensure safety, can be selected.
5, underground coal mines and pyrotechnic explosives plant explosion-proof electrical equipment selection, should be based on the characteristics of pyrotechnic explosives and fireworks to determine the selection of electrical equipment.