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How many types of explosion-proof electrical equipment for mines include

Mine electrical equipment is divided into two categories, general electrical equipment and mine explosion-proof electrical equipment.

　　General mine electrical equipment is a non-explosion-proof electrical equipment used in coal mines. It can only be used in underground mines where there is no danger of gas and coal dust explosion. The basic requirements are: the shell is strong and closed, which can prevent direct contact and live parts from the outside; it is drip-proof, splash-proof and moisture-proof; it has a cable entry device and can prevent the cable from twisting, unplugging and damage; switching handles and doors There are interlocking devices between the covers.

　　There is a clear permanent embossed mark "KY" on the obvious places of the casing of general mine electrical equipment.

　　According to different explosion-proof requirements, mine explosion-proof electrical equipment is mainly divided into mine explosion-proof type, mine-increased safety type, mine-used intrinsic safety type, mine-used positive pressure type, mine-used sand-filled type, mine-used encapsulation type and Airtight type for mines, etc.

　　Mine explosion-proof electrical appliances series

　　1. Explosion-proof electrical equipment for mine

　　The so-called explosion-proof means that the live parts of electrical equipment are placed in a special shell, which has the function of isolating the sparks and arcs generated by the electrical parts in the shell from the explosive mixture outside the shell, and can withstand the explosive mixture entering the shell The explosion pressure generated when the electrical equipment in the shell is detonated by sparks and arcs, while the shell is not destroyed, and at the same time, it can prevent the explosion products in the shell from spreading to the explosive mixture outside the shell. This special enclosure is called a flameproof enclosure. Electrical equipment with flameproof enclosures is called flameproof electrical equipment.

　　2. Increased safety electrical equipment for mines

　　The explosion-proof principle of increased-safety electrical equipment is: for those mine electrical equipment that do not produce arcs, sparks and dangerous temperatures under normal operating conditions, in order to improve their safety, the structure, manufacturing process and technical conditions of the equipment A series of measures have been taken to avoid sparks, arcs and dangerous temperatures under operating and overload conditions, and to achieve electrical explosion protection. Increased safety electrical equipment is based on the original technical conditions of electrical equipment, and certain measures have been taken to improve its safety, but it does not mean that this electrical equipment has better explosion-proof performance than other types of explosion-proof electrical equipment. The degree of safety performance of increased-safety electrical equipment depends not only on the structure of the equipment itself, but also on the maintenance of the equipment's operating environment. The electrical equipment that can be made into increased-safety electrical equipment is only those electrical equipment that does not produce arcs, sparks and overheating during normal operation, such as transformers, motors, and lighting fixtures.

　　3. Intrinsically safe electrical equipment for mines

　　The principle of explosion protection of intrinsically safe electrical equipment is to limit the spark discharge energy and heat energy of the circuit by restricting various parameters of the electrical equipment circuit, or taking protective measures, so that the electric spark and the electric spark generated under normal operation and specified fault conditions No thermal effect can ignite the explosive mixture in the surrounding environment, thus realizing electrical explosion-proof. The circuit of this kind of electrical equipment has explosion-proof performance, that is, it is "essentially" safe, so it is called intrinsically safe type (hereinafter referred to as intrinsically safe type). Electrical equipment using intrinsically safe circuits is called intrinsically safe electrical equipment.

　　4. Positive pressure electrical equipment

　　The explosion-proof principle of positive pressure electrical equipment is: put the electrical equipment in the shell, there is no flammable gas release source in the shell; fill the shell with protective gas, and make the pressure of the protective gas in the shell higher than the surrounding explosive environment In order to prevent the external explosive mixture from entering the shell and realize the explosion-proof of electrical equipment.

　　The sign of positive pressure type electrical equipment is "p", and the full name of the sign is "Expl".

　　5. Sand-filled electrical equipment for mines

　　The explosion-proof principle of sand-filled electrical equipment is: filling the shell of the electrical equipment with quartz sand, burying the conductive part

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