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Home > Industry Information > The classification of explosion-proof electrical appliances in petrochemical industry

The classification of explosion-proof electrical appliances in petrochemical industry

2021-05-02

At present, China's explosion-proof electrical goods are divided into 10 types in accordance with national standards. However, among the explosion-proof electrical appliances used in factories, the most widely used are explosion-proof and increased safety. Intrinsically safe types also have certain usage. Explosion-proof electrical appliances are less applied. These products are classified as follows:
1 explosion-proof control box
It mainly consists of a lighting distribution box for controlling the lighting system and a power box for controlling the power system. Most of these products are constructed as modular units and can control up to 12 circuits. Most of their outer shells are made of forged aluminum alloy materials. Some of them are welded by steel plates, and a few are made of insulating materials. Its interior is mainly composed of circuit breakers, contactors, thermal relays, changeover switches, signal lights, buttons and other components. The manufacturer can also choose equipment according to user needs. Explosion-proof grade up to IICT6 level. The authors pointed out that explosion-proof automatic switches, explosion-proof knife switches, and fuses are also often used as control power or lighting distribution systems in some control applications, but only become a single piece. Therefore, these products are also classified as such products.
2. Explosion-proof starter
Such commodities include manual starters, electromagnetic starters, reversible electromagnetic starters, auto-coupling decompression starters, Y-△ change-over voltage starters, and feed switches. Explosion-proof starter products as terminal control equipment, generally a starter controls a motor, belonging to a wide range of goods. Its shell casing is usually made of forged aluminum alloy or steel plate. The interior is generally composed of contactors (air or vacuum), motor protection systems, signal lights, push buttons, and autotransformers, and they all have local control, remote control, and automatic control functions. Circuit breakers are also installed in some products as master switches to make goods more perfect.
3 explosion-proof control switch
The market demand for this kind of commodity is also relatively large, so the manufacturer is also more, including lighting switches, switch (combination switch), limit switch, pull switch and other small explosion-proof products. The explosion-proof grades of these products can be up to IICT6 grade. The explosion-proof housing shell is usually a composite structure made by forging aluminum alloy die-casting, and a few manufacturers use other raw material shells. This type of commodity is characterized by its small size, single internal components, low technical content, simple structure, and easy manufacturing.
4. Explosion-proof main appliances
A master device is a switching device that acts as a closed or disconnected control circuit to announce a command or program control. Such explosion-proof electrical appliances mainly include control buttons and operating columns. Explosion-proof control button housing is generally made of polycarbonate, glass fiber reinforced unsaturated polyester resin or ABS plastic injection molding, and a small amount is cast aluminum molding. It is generally constructed as an increased-safety enclosure with flame-proof components and can perform anti-corrosion functions. The explosion-proof grade can reach Class IIC. The operating column is mainly composed of a main tank, a junction box and a pillar. Its main box and junction box are made into one body, and some are made into separate bodies, each with its own characteristics. Its raw materials are basically made of forged aluminum alloy materials. The interior consists of various appearances, switches, buttons, and signal lights. Can be combined according to different needs.
5 explosion-proof junction box
In use, electrical equipment must be connected to the Power Supply network through wires or cables to form a system to complete its use. However, it is not possible to connect conductors or cables indefinitely, and there are many places where there is a need to connect taps in series and in parallel during wire bonding. This will inevitably cause joints to be exposed and cause accidents. Explosion-proof junction boxes are commodities that are manufactured to solve such problems in order to further ensure safe production. Such products include junction box, junction box, string box, hanging box, junction box and other commodities, whose shell is mainly made of forged aluminum alloy. According to the requirements, there are a lot of incoming and outgoing lead-in devices. The box is equipped with terminals for connecting or tapping. Most of these products are made of explosion-proof or increased safety type, the size of a large or small, a big difference, explosion-proof grade up to IIC level.
6. Explosion-proof lamps
Lighting conditions must be adopted in any workplace and environment, and sites rich in various explosive gases are not exceptions. Because of its many places of use, all over the production corners, explosion proof lighting products are produced in large quantities. There are many varieties of such products and all specifications, but they can be roughly divided into lighting, signage, signal, portable, etc.; from the light source type can be divided into incandescent lamps, mercury lamps, nano lamps, halogen lamps, neon lamps And fluorescent lamps; from the more points of construction, there are generally hanging, hanging, wall-mounted, ceiling, portable, cantilever and so on. From the viewpoint of installation, explosion-proof lighting can be completed from 30° to 90°. From power, it can be from a few tens of watts to several hundred watts. The installation height starts from the ground to several meters high. It can be said that explosion-proof lighting is the largest output of all explosion-proof electrical goods and the most used goods. And, because of its specific function, it caused a situation of large loss and large replacement. The structural shapes of these products vary, but many changes, but from the perspective of explosion-proof performance, basically the flameproof type is the main shell material to wrought aluminum alloy as much, basically able to meet the user in the following IIC level places The need for lighting and display functions.
7. Explosion-proof connection type
The main function of the explosion-proof connector is for cable connection and cable branching. Its main products are explosion-proof plugs and explosion-proof power socket boxes. The extra voltage is 220V ~ 380V, the extra work current is up to 100A, the type has two poles, three pole plus neutral line and grounding wire structure, the commodity shell is made of metal and plastic raw materials, explosion-proof grade up to IIC grade. The interior is mainly composed of connectors, and some products are equipped with a switch with a break point. This switch has a linkage function with the connector, that is, the switch is disconnected after the switch is disconnected, and the plug is first inserted and then closed. Products without switch also have the function of disconnecting the grounding wire after disconnecting the main circuit and inserting the grounding wire before inserting the main circuit. This is all done to ensure safe operation. Most of these products are used for direct operation, so their insulation performance requirements are generally high and must not be ignored.
8. Explosion-proof fan
Such products mainly include explosion-proof ceiling fans, explosion-proof exhaust fans and explosion-proof axial fans and other commodities. Its structure consists of explosion-proof motors, explosion-proof junction boxes and explosion-proof speed controllers and blades. Its extra working voltage is generally up to 380V, explosion-proof grade up to IIBT4.
9. Explosion-proof electrical appliances with heat function
Petrochemical companies often require some heating equipment and electric heating equipment during the production process, so the explosion protection of such products is also very important. The main products are explosion-proof heaters, explosion-proof heaters. Because commodities such as explosion-proof control transformers and explosion-proof ballasts do not receive heat energy, they also generate heat during operation, and they should also receive great attention. Therefore, they are all included in such products. Of course, today, with the rapid development of science and technology, there will also be many electric heating equipment made of high-tech materials. However, the problem of explosion protection cannot be ignored. The main components of the explosion-proof heat-generating equipment are components such as windings, controllers and junction boxes, and often have protective functions for controlling or monitoring the temperature. This kind of commodity is basically a flameproof type, explosion-proof grade is IIBT4 grade.
10. Explosion-proof alarm electrical appliances
In some production occasions, some lights and sounds are often required to prompt everyone's actions. In an atmosphere rich in explosive gas, such appliances are even more important. Its main products are explosion-proof lights, explosion-proof electric bell, explosion-proof electric flutes, explosion-proof Feng Ming and other commodities, the structure is usually explosion-proof type, made of forged aluminum alloy, explosion-proof grade up to IICT6 level. Its operating voltage can be divided into straight 36 ~ 220V, communication up to 380V. Explosion-proof junction boxes and explosion-proof housings are the main components.
11. Explosion-proof electromagnets
Such products include explosion-proof electromagnets, explosion-proof solenoid valves, and explosion-proof electromagnetic actuators. Its operating principle is that under the action of the electromagnetic field, the electromagnetic force generated by the mechanical equipment to promote operations, - generally for braking purposes. Most of the structures are explosion-proof, made of cast steel or cast iron, explosion-proof grade IIBT6. Its main technical parameters are generally thrust or suction (calculated in kg) and power continuity rate, must not be long-term power, otherwise it is prone to overheating risks.
12. Explosion-proof other types
In the complex production process, there are often many special requirements that require the manufacture of special explosion-proof electrical goods. Because of the low output of such commodities, they require special products that are non-standard products, so they are classified as explosion-proof. There are electrical goods appearance, temperature transmitters, pressure transmitters, speed transmitters, liquid level meters, quantitative control devices, ignition devices, cameras and other commodities. These goods are basically manufactured based on production requirements. Although their performance requirements are different, most of the goods are metal-made shells, and their types are explosion-proof or increased safety structures, and a few of them are intrinsically safe. Type products, their operating voltage and operating current - are generally low, explosion-proof grade IICT6 grade.
In the above, the products for explosion-proof electrical appliances used in factories can be roughly divided into 12 categories, so as to obtain a clearer and more rational understanding of these products. The above categories may be missing or incomplete. But basically it includes most of the goods that are currently circulating on the market.
It should be pointed out that there are some commodities, such as reducer fittings, seal fittings, pipe fittings, unions, flexible fittings, etc. Many manufacturers have listed them as explosion-proof products. This is a misunderstanding. These products can only be called auxiliary pieces of explosion-proof electrical goods. Therefore, the commodity classification here does not include these commodities.

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