Jiangxi explosion-proof air conditioners 2p

Explosion-proof electrical / electronic there is a danger of electrical equipment explosive gases and vapors place used. Chemical production often faced the risk of explosion of gases and vapors in the place of these media, in accordance with the relevant norms, standards and regulations, the correct selection of the appropriate explosion-proof electrical, thereby preventing explosion caused by an explosive mixture around. It is to ensure safety in production, an important measure to prevent explosions and fires. There is usually necessary proof mark and technical data on the explosion-proof electrical equipment, in order to avoid misuse. About explosion-proof electrical divided into: explosion-proof lighting, explosion-proof electrical equipment, explosion-proof fittings, explosion-proof electrical equipment, dust explosion-proof electrical, stainless steel explosion-proof electrical, Pinyin: fangbaodianqi English name: explosion-proof electric apparatus Note: Generally speaking, the presence of explosion-proof electrical means There is a danger of electrical equipment explosive gases and vapors place used. Chemical production often faced the risk of explosion of gases and vapors in the place of these media, in accordance with the relevant norms, standards and regulations, the correct selection of the appropriate proof explosion-proof electrical appliances, is to ensure safety in production, to prevent explosions and fires important measures. By type flameproof, increased safety, intrinsically safe, positive pressure, oil-filled, filling sand, non-sparking, a special type. The main varieties are explosion-proof switch and knife switch, explosion-proof automatic air switch, factory explosion-proof magnetic starter, explosion-proof control button, explosion-proof operation column, explosion-proof limit switch, explosion-proof latch, explosion-proof junction box, explosion-proof junction box, explosion-proof fittings and sealing materials , explosion-proof solenoid and solenoid valve. Category 1 explosion-proof control cabinets including lighting distribution box for controlling the lighting system and the system for controlling the power of the power box. Most of the structure of these products is a combination of explosion-proof electrical type, can control up to 12 loops, the majority of its shell is made of aluminum alloy casting, also part of welded steel, as well as a small part of the insulating material of the housing. Its interior consists of circuit breakers, contactors, thermal relays. Switches, lights, buttons and other elements, the manufacturer can also dig the root user needs to select equipment. Explosion levels up ⅡCT6 level. Incidentally, explosion-proof automatic switch, explosion-proof knife switch and fuse in some occasions used as control or lighting control power line distribution system division of use, but it turned into a single piece. Therefore, these products are classified into these products in the past. 2 starter category proof of such products include manual starter, solenoid starter, reversing electromagnetic starter, auto decompression starter, Y-Δ transform voltage starters and the feed switches and other products. Explosion starter products as a terminal control device, usually a starter control a motor, belong to the volume products. The shell casing usually made of cast aluminum alloy or steel. Its interior is generally the contactor (air type or vacuum type), motor protection systems, lights, buttons, and autotransformer OS and other components, and generally have local control, remote control and automatic control functions. Some products are also installed in the circuit breaker for the main switch, making the product more perfect. 3 explosion-proof control switch class market demand of these products is also relatively large, so manufacturers are more, including light switches, switch (combination explosion-proof electrical switch), the trip switch, pull switch and other small-proof products. These products are proof grade up ⅡCT6 level, its explosion-proof enclosure housing is usually made of aluminum die casting using a composite structure, there are a few manufacturers use other material shell. These products are characterized by small size, the internal components of a single, low-tech, simple structure, easy to produce. 4 explosion-proof electrical master class is used as the main electrical control circuit to open or close, to issue a command or program-controlled switching equipment. Such proof electrical includes control buttons and columns. Explosion-proof control button housing is generally used polycarbonate, glass fiber reinforced unsaturated polyester resin or ABS plastic injection molding to manufacture, there is a small amount of aluminum die-cast. The general structure for the increased safety enclosure, built flameproof components, and can prevent corrosion, explosion-proof grade up ⅡC level. Operation column consists of main boxes, junction boxes and pillars. Its main box and junction boxes made some one, some system component body, its own characteristics. The material is basically a manufacturing cast aluminum alloy. Internally by a variety of instruments, switches, buttons and lights and other components. It can be combined according to different needs. 5 explosion-proof junction box electrical equipment shall be in use wires or cables with power supply network connected together to form system to complete its function. However, explosion-proof electrical connecting wires or cables can not be infinitely long, and there are many places to serial, parallel conduct wire taps during the connection process. This will inevitably result in the joint portion of the outer filter, easily lead to accidents. Proof junction boxes products is to solve such problems and the production of products, in order to further ensure safety in production. Such products include junction boxes, junction boxes, threading box, hanging junction box, junction box and other products, which mainly consists of cast aluminum alloy shell. There are many necessary incoming and outgoing entries, the box is equipped with terminals for connection or tap purposes. Most of these products are made from flameproof or increased safety type, volume, some small, quite different proof grade up ⅡC level. 6 Explosion-proof lamps any workplace and environmental measures must be taken to lighting, spaces containing various explosive gas is no exception. Due to the use of a lot of places, throughout every corner of production, thus making mass production of explosion-proof lighting products. Such product varieties, all specifications, but can be divided into lighting, signs with, several forms of signal, portable use, etc., from the light sources can be divided into incandescent lamp, self-ballasted mercury vapor, high pressure sodium lamps, metal halide lamps, dysprosium lamps and fluorescent lamps, from the structure more numerous, generally there hanging, hanging, wall-mounted, ceiling, portable, cantilever. From the installation point of view, explosion-proof lamps may be able to achieve from 30 ° ~ 90 °. From power, it can be from tens of watts to several hundred watts. Installation height from the ground began to several meters high. It can be said that all explosion proof lighting and electronic products yield the largest and most used products. Moreover, because of its specific functions, resulting in a loss, the replacement amount of the situation. Structural shape of these products vary, many changes, but the proof of performance points, basically the main flameproof enclosure with cast aluminum alloy material as much, basically meet the user premises ⅡC level in each of the following kind of lighting and display needs. 7 explosion-proof connection type connector main function is to cable and cable branch purposes. Its main products are explosion-proof and explosion-proof electrical outlet box plug. Amount given proof electrical voltage is 220V ~ 380V, rated operating current up to 100A, varieties of poles, three poles plus neutral line and ground line structure, products made of metal and plastic housing there is material proof grade up ⅡC level. Composed mainly of internal connectors, and some products have switches installed with breakpoints, have linkage function between the switch and the connector, after you disconnect switch plug, insert the plug after the first closing. Products without switch also has a break before the main circuit is disconnected ground wire, grounding wire is inserted after the first insertion of the main circuit. This is to ensure the safety status of the operation. Most of these products are directly manipulated by hand, so its generally higher insulation performance, must not be ignored. 8 Explosion fan of this class of products mainly include proof ceiling fans, explosion-proof and explosion-proof exhaust fan axial fans and other products, its structure consists of explosion-proof motor, explosion-proof junction box and speed controller and blade components. Rated operating voltage is generally to 380V, explosion-proof grade up ⅡBT4 level. 9 having a heating function of explosion-proof electrical class petrochemical enterprises in the production process often requires some heating equipment and electrical heating equipment, explosion-proof question therefore such products is also very important to the explosion-proof electrical. The main products are explosion-proof heaters, explosion-proof heater. Since explosion proof control transformer and ballast products Although the main function is not to obtain energy, but it will also generate heat during operation, should be cause for great attention, so all included in these products. Of course, the rapid development in technology today, there will be a lot of material with high-tech electric equipment, but the problem can not ignore its proof. Explosion-proof heating apparatus for the winding main components, controllers and junction boxes and other components, but also tend to have a temperature control or monitoring of protection. Such products are substantially flameproof, explosion-proof rating for ⅡBT4 level. 10 explosion-proof electrical alarm class in certain production situations, often need some lighting and sound to prompt people's actions, in an environment containing explosive gases, such appliances has become more important. Its main products are explosion-proof lights, explosion-proof electrical seal, explosion-proof electric flute, explosion-proof buzzer, and other products, the structure is usually flameproof, with a cast aluminum alloy, explosion-proof grade up ⅡCT6 level. The operating voltage can be divided into straight 36 ~ 220V, AC up to 380V. Explosion-proof junction box and housing is the main structure. 11 explosion-proof solenoid type electromagnet such products mainly include proof, explosion-proof solenoid valve, explosion-proof solenoid drives, and other products. Its working principle is the electromagnetic field, the electromagnetic force generated by the machinery and equipment to promote the work, generally used for braking. Most of flameproof construction, with steel or cast iron, explosion-proof grade ⅡBT6 level. The main technical parameters are generally thrust or suction (in kg basis) and Duty cycle, long-term power must not be, or likely to cause dangerous overheating. 12 Explosion other classes in the complex production process often encounter many special requirements, which need to create a special explosion-proof electrical products. Due to low production of such proof electrical products, require special, is a non-standard products, therefore summarized as proof other classes. There are electrical instruments, temperature transmitters, pressure transmitter, speed transmitter, level gauge, quantitative controller, ignition devices, cameras and other products. These products are basically manufactured production needs, although its performance requirements vary, but most of the products are made of metal shell, its type is flameproof or increased safety type structure, there are a small part of the product is intrinsically safe products, its operating voltage and operating current is generally relatively low, explosion-proof grade ⅡCT6 level. Above the factory explosion-proof electrical products can be divided into twelve categories, in order to achieve these products have a clearer understanding of rationality. The above classification may have missing or incomplete places. But basically it includes the flow of most products on the market today. It should be noted that: there are some products, such as adjustable joints, sealing joints, fittings, union, flexible connection pipe and other products, many manufacturers will it as proof product, which is a misconception. These products can only be called aid-proof electrical products. So here's product classification does not include these products. 13 civilian proof products needed in real life, and now in the civilian needs some proof products, these products more complex, so the normalization proof for civilian products, are proof tricycle, electric drills and other proof. Such products require high technology. A new start is proof of the industry, and a new direction! Design features a shell design portable, intrinsically safe instrument housing is sometimes used plastic and sometimes metal casing. When selecting a plastic housing, without the risk of static build-up when working properly to ensure the plastic casing, the surface resistance must not exceed 1 × 109Ω. Plastic housing should be subject to the impact test and thermal stability test. Normal operation sparks, arcs or dangerous temperature electrical equipment, power greater than 250W or currents greater than 5 A Class Ⅰ electrical equipment, shall be in the junction box with the device connected to the main electrical junction box is designed for cable or wire and electrical equipment connected components. Currently Class Ⅰ flameproof electrical equipment widely used flameproof wiring. Box junction box wall should be painted arc-resistant paint, flameproof joints junction box and the body cavity should be done on the anti-rust treatment, such as anti-rust oil coating. In addition, the explosion-proof electrical equipment, should have a permanent total Ex-proof mark and MA safety signs in a prominent place on its housing. For some local coal mines operating illegally present in the motor phenomenon, we developed a small explosion QF40 type starter, the rated voltage of 380V, rated current of 40A. Shell design into the body cavity with the wiring compartment. Housing with 3 mm thick steel plate. Flameproof joint size and precision in line with GB3836.2 provisions. Shell external dimensions of 437 mm × 308 mm, housing protection rating of IP54. In front of the housing with a plate, top right corner of the nameplate has Ex sign, proof mark dⅠ (150 ℃), in addition, also marked with the name, model, rated voltage, rated current, explosion-proof certification number on the nameplate, safety signs, serial number, date of manufacture and so on. First 2 circuit design, circuit design features to complete electrical appliances, electrical schematics to ensure correctness. Secondly, explosion-proof electrical clearances, creepage distances, insulation parameters must comply with the requirements of GB3836. For example, research QF40-proof starters, the terminal design creepage distance of not less than 16 mm, clearance of not less than 10 mm. Explosion-proof electrical components and assembly disposed cavity creepage distance of not less than 16 mm, clearance of not less than 10 mm. Flameproof terminal compartment is provided in the ground stud. Housing is provided with external ground screws. Development of intrinsically safe steel string frequency meter under normal operating and fault conditions the maximum operating current and voltage are not greater than the maximum allowable current design: it creepage distance of 3 mm, the creepage distance of the insulating coating under 1mm Clearances to 3 mm. 3 intrinsically safe power supply design portable electrical equipment independent power source is most commonly used batteries and accumulators. Batteries and battery power are all resistive circuit, according to the resistive circuit curve to determine the minimum ignition current supply security parameters. Press the battery maximum voltage corresponding to the minimum ignition current isolated, divided by the safety coefficient value (2), the battery is designed to allow the maximum safe current. The most serious battery discharge status is directly to the battery short circuit. Therefore, should the maximum short-circuit current of the battery as a benchmark to measure the performance of intrinsically safe power supply. If the battery is greater than the maximum short circuit current design allows the value to be added to the current limiting resistor string. Also, cell or battery and current limiting resistor gum called one, constitutes intrinsically safe components. Rubber sealing material has an epoxy resin, a silicone rubber, paraffin and other industries. For example, we designed a special steel strings frequency counting intrinsically safe battery pack, the four 5 # rechargeable battery concatenation, and string into a homemade with Kang copper limiting resistor, the power of 5.2 W. And filled the entire space of the battery case with epoxy glue, potting firm. The practical application of coal mine intrinsically safe electrical equipment, there are many uses to introduce the rectified power supply from the power grid. Since the input circuit and the associated power grid, therefore, to design a flameproof and intrinsically safe. For flameproof electrical power, it is at the higher power, in explosion-proof junction box wiring, electrical power to complete the work in communication. Division Zone 0 category, level and temperature group 1, explosive atmosphere hazardous areas: continuous presence or long-term emergence environment of explosive gas mixture. Zone 1 explosion-proof electrical appliances: Environmental explosive gas mixture may occur during normal operation. Zone 2: In normal operation impossible environment explosive gas mixture or the environment even if it is only short-term explosive gas mixture present. 0 areas are generally exists only in a closed container, storage tanks and other internal gas space, in the actual design process, an area rarely exist, in most cases belong to two areas. 2, explosion-proof electrical equipment is divided into two categories: Class Ⅰ coal mine electrical equipment Ⅱ class properties except electrical equipment used in mine 3, Ⅱ type of electrical equipment, according to explosive gas mixtures suitable for maximum experimental safe gap or the minimum ignition current ratio, divided ⅡA, ⅡB, ⅡC three; according to its maximum surface temperature T1 ~ T6 divided into six groups. 4, an explosive gas mixture by ignition temperature Group 2.1, explosion-proof electrical equipment has to withstand an internal explosion of an explosive mixture of gas pressure, and prevent internal explosion to the explosive mixture of electrical equipment spread around the enclosure housing electrical equipment, its flag "d". 2.2, increased safety of electrical equipment under normal operating conditions will not produce arcs, sparks, or may ignite an explosive mixture of heat, to take measures to improve the safety margin structure to avoid recognition in normal and overload conditions arcs, sparks or humidity electrical equipment, marked as "e". 3, the principle of explosion-proof electrical equipment ignite the combustible gas mixture for two reasons: one is the electrical spark generated by the equipment, arc, electrical equipment other surface (i.e., the combustible gas mixture into contact with a surface) heat. For devices during normal operation can produce arcs, sparks of parts placed in a flameproof enclosure, or take encapsulation type and other type of protection filling sand, oil-filled type or positive type, etc. can be explosion-proof purpose. For increased safety of electrical equipment is in normal operation without arcing, sparking and dangerous high-temperature equipment, if we take some protective measures in its structure, so that the device does not try to run or recognized under normal overload conditions arcing, sparking and overheating, can further improve the safety and reliability of the equipment. Therefore, this equipment during normal operation, there is no ignition source, and can be used in explosive atmospheres. Example 1 Ex mark, such as electrical equipment for ⅡB class flameproof T3 group, marked as ExdⅡBT3. 2, such as electrical equipment for Class Ⅱ increased safety, temperature class T2 group, marked as ExeⅡT2. 3. Electrical equipment used more than one type of complex, marked the first body type of protection, indicated after other types of protection, such as the main use of increased safety flameproof components built ⅡC class, temperature class T4, flag ExedⅡCT4 . 4, such as electrical equipment for dust-proof dust-T11 group. Flag: DIPDPT11. This article is cited in Baidu Encyclopedia: http: //baike.baidu.com/view/733833.htm this article for informational purposes only and do not represent all types of explosion-proof electrical.