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What is an explosion-proof headlamp?

News Trade News2021-09-26 19:38:00

Explosion-proof headlamps refer to lamps that are used in dangerous places where flammable gas and dust exist and can prevent arcs, sparks and high temperatures that may be generated inside the lamp from igniting the flammable gas and dust in the surrounding environment so as to meet the requirements of explosion-proof. Also known as explosion-proof lamps, explosion-proof lighting. Different flammable gas mixture environments have different requirements for the explosion-proof grade and explosion-proof form of the explosion-proof lamp.

Performance characteristics

1. Equipped with a T8LED tube, the light source is efficient and energy-saving, more than 50% energy saving than T8 fluorescent tube.
2. Through the unique light distribution design, the light type and light-emitting angle of the LED light source are accurately controlled to avoid light pollution and ineffective light utilization; the light is soft, has no glare, does not cause eye fatigue of the operators, and improves work efficiency.
3. The shell is made of lightweight aluminium alloy die-casting, and the surface is treated with high-voltage electrostatic spraying.
4. There is a wiring cavity inside the lamp, and there are special wiring terminals. The user can directly enter the wire during installation, and there is no need to set up a junction box, which is convenient for installation.
5. When replacing the lamp tube, you only need to fold off the end cap to directly replace the lamp tube.
6. T5 fluorescent tubes of famous international brands can be selected according to customer requirements, which have high luminous efficiency and are more in line with the actual lighting environment. Compared with T8 fluorescent tubes, it can save about 30% of electricity.
7. It can be equipped with emergency devices according to user requirements. The built-in lamp body is light in weight. When the external power is cut off, the lamp will automatically switch to the emergency lighting state.

Lamp type classification

Explosion-proof lamps are generally classified according to the selected light source, explosion-proof structure type, and use mode. According to the light source classification, there are explosion-proof incandescent lamps, explosion-proof high-pressure mercury lamps, explosion-proof low-voltage fluorescent lamps, mixed light source lamps, etc.; according to the explosion-proof structure type, there are explosion-proof lamps, increased safety lamps, composite lamps, etc.; according to the method of use, there are fixed Type explosion-proof lamps and portable explosion-proof lamps.

Explosion-proof headlamp

Type

The explosion-proof type is divided into 5 main types: explosion-proof type, increased safety type, positive pressure type, non-sparking type and dust explosion-proof type. It can also be composed of other explosion-proof types and the above-mentioned explosion-proof types combined or composite and special types.

Flameproof type d

All parts of the equipment that may ignite explosive gas mixtures are enclosed in a shell. The shell can withstand any joint surface or structural gap of the shell, and the flammable mixture that penetrates into the shell will explode inside without damage and can ensure the internal When the flame gas propagates through the gap, the energy is reduced, and it is not enough to detonate the gas in the shell.

Increased safety e

Electrical equipment that does not produce arcs and sparks under normal operating conditions takes some additional measures to improve its safety and prevents the possibility of dangerous temperatures, arcs and sparks in its internal and external components. The explosion-proof type is further adopted in the structure. Protective measures improve the reliability and safety performance of the equipment.

Positive pressure type p

By keeping the pressure of the protective gas inside the equipment enclosure higher than the pressure of the surrounding explosion-proof environment to the level of safety, electrical equipment protects the static positive pressure inside the system or maintains a continuous flow of air or inert gas to limit the flammable mixture from entering the enclosure. Take away the flammable gas that enters the enclosure under non-positive pressure inside the equipment to prevent the formation of the flammable mixture in the enclosure.

This placement I

All circuits inside the equipment are under standard conditions (including normal operation and specified fault conditions), and any sparks or any effects generated cannot trigger the specified intrinsically safe circuits in an explosion-proof gas environment.

Encapsulated type m

Encapsulate the electrical components that may produce sparks, arcs or dangerous temperature explosions that ignite explosive mixtures in a potting compound (composite) so that they cannot ignite the surrounding explosive mixtures. Pouring measures can prevent electrical components. Short-circuit, solidify electrical insulation, avoid sparks, arcs and dangerous temperature ignition on the circuit, prevent the intrusion of explosive mixtures, and control the surface temperature under normal and fault conditions.

Oil-filled o

Infiltrate the entire equipment or parts of the equipment into the protective liquid l in the oil so that it cannot ignite the explosion-proof gas environment above the fuel surface or outside the enclosure.

Sand-filled q

Fill the shell with sand or other powder materials with specified characteristics so that under the specified conditions of use, the arc or high temperature generated in the shell cannot ignite the electrical equipment protection type in the surrounding explosive gas environment.

Airtight type h This type of explosion-proof equipment adopts an airtight enclosure. That is, the explosive gas mixture in the environment cannot enter the inside of the equipment enclosure. Airtight enclosures are sealed by melting, squeezing or glueing. Most of these enclosures are not removable to ensure permanent tightness.

principle

The principle of the explosion-proof type is based on the explosion-proof concept and fire protection type of the European standard EN13463-1:2002 "Non-electrical equipment for explosive atmospheres Part 1: Basic methods and requirements". The explosion-proof type is to take measures to allow internal explosions and prevent flame propagation. An explosion-proof type is the most commonly used type of explosion-proof. Because the shell of this explosion-proof type lamp is generally made of metal material, it has good heat dissipation, high shell strength and good durability, and it is very popular with users. Moreover, many increased-safety explosion-proof lighting components, such as lamp holders, interlock switches, etc., also use explosion-proof structures. Electrical equipment with flameproof enclosures is called flameproof electrical equipment. Suppose an explosive gas mixture enters the flameproof enclosure and is ignited. In that case, the flameproof enclosure can withstand the explosive pressure of the internal explosive gas mixture and prevent the internal explosion from spreading to the explosive mixture around the enclosure. This is an explosion-proof gap principle, that is, a structure designed based on the principle of using metal gaps to prevent the spread of explosion flames, cool the temperature of the explosion products, achieve flame extinguishment and cooling, and inhibit the gas expansion of the explosion.

design

When designing the structure of flameproof luminaires, manufacturers often focus on the shape and strength design of the flameproof enclosure but often ignore the fasteners, introduction devices, transparent parts, suspension devices, signs, etc., that are integral to the enclosure. Design of other devices. Below, according to the requirements of GB3838.2-2000 "Electrical Equipment for Explosive Gas Atmosphere Part 1: Explosion-proof Type "d", some issues that need attention are analyzed in terms of structural design:

Shell fasteners

There are two types of flameproof enclosures fastened by bolts: flat and spigot. For the plane structure, the bolts not only perform the tightening operation but also ensure plane clearance. For the spigot structure, when the explosion-proof surface only considers the cylindrical part, the bolts only play a tightening role; when the explosion-proof surface needs to consider the cylinder and the plane, the bolts not only perform the tightening operation but also play a role in ensuring the clearance of the plane part. When tapping the thread directly on the shell, attention must be paid: try not to pass through the flameproof shell for fastener screw holes. When passing through the shell, there should be a margin of more than 3mm at the bottom of the screw hole; when using light alloy materials such as aluminium alloy as the partition, When the shell is exploded, due to the low strength of the aluminium alloy, when using screws to fasten the flameproof shell that is frequently opened (such as changing the light source, it needs to be turned on), the aluminium alloy shell should not be tapped directly, and it should be embedded to prevent loosening. Internal and external threaded steel sleeve to increase the strength of the screw hole and prevent failure due to rotten threads; no need for the user to open the light source or repair, and the bolts that have been installed at the factory can be directly tapped and tightened on the shell Screw holes, but can not use fine threads, try to use coarse threads, and there are enough engagement buckles to meet the tightening requirements.
In short, when designing enclosure fasteners, we should first distinguish its role in the flameproof enclosure, whether it is only for fastening or both for fastening and ensuring plane clearance, and then determine the maximum axial direction of the bolt. Use appropriate bolts for the load.

Explosion-proof headlamp

Introduction method

The introduction of cables and wires can be connected in the following two ways:
(1) Indirect introduction, using junction box or plug-in device connection;
(2) Directly lead-in, connect the cable and wire directly to the main housing. It is worth noting that if the sealing ring is ageing or not tightly compressed, it can directly cause combustion or explosion.
Therefore, explosion-proof lamps that produce dangerous sparks, arcs or dangerous temperatures during normal operation and whose enclosure volume is greater than 2000cm3 or GB3836.1 "Electrical Equipment for Explosive Gas Atmospheres Part 1: General Requirements" Article 4 are classified as Class IIC explosion-proof lamps, which are not suitable Adopt elastic sealing ring compression type direct introduction method. Although GB3836.2 does not explain this, GB3836.15-2000 "Electrical Equipment for Explosive Gas Atmosphere Part 15: Electrical Installation in Hazardous Locations (Except Coal Mines)" provides for this. The cable is introduced to the luminaire through the lead-in device, from installation to use; if there is a possibility of tension, add a cable anti-pull-off pressure plate to the compression nut of the lead-in device or inside the lamp close to the lead-in device to prevent the force from being transmitted to the terminal To prevent possible movement of cables and prevent poor contact or failure of electrical connections. The lamp may need to provide more than one introduction device during the design to facilitate users' different installation requirements. When leaving the factory, all the lead-in devices should be installed with plugs, and the structure of the plugs must be suitable for the explosion-proof type. Or, install only one lead-in device, and replace the remaining holes (after the lead-in device is removed) with a bulkhead suitable for explosion-proof type. In this way, the failure of the flameproof enclosure will not be caused by forgetting to block the redundant introduction device.

Transparent installation

Explosion-proof luminaires cannot be separated from transparent parts, which are the lowest-strength parts of the shell parts. Therefore, the reliability of the installation of the transparent parts directly affects the safety performance of the explosion-proof luminaires.

Let's analyze the three commonly used installation methods of transparent parts:

(a) It is directly sealed in the shell and forms a whole with the shell. This method is simple, practical and widely used. The sealing material should be temperature-resistant and oil-resistant rubber parts or use epoxy resin and other adhesives to seal the transparent parts in the shell and press tightly.

(b) With or without a liner, directly fasten the transparent part in the shell. When the gasket is not used, the flatness of the joint surface of the transparent part is required to be very high. Generally, it is suitable for small flat glass, and the glass joints are ground flat at the same time. Otherwise, the glass is unevenly stressed and easily broken.

(c) It is sealed or glued on a frame, and the frame is fastened in the shell so that the transparent part can be replaced as a whole. This structure is rarely used in lamps. In some large-scale equipment that requires frequent replacement of transparent parts, the transparent part and the frame are replaced as integral parts.
The sealing of the transparent part and the frame can refer to the type of a). In terms of structure, the force (generated by the internal explosion) of the transparent part should be transmitted directly to the metal shell as far as possible. It is not appropriate to pass the pressure plate and or screw of the transparent part to the metal shell. At the same time, after the transparent part is installed Can not be stressed so as to ensure the reliable combination of the transparent part and the shell.

Many production sites will produce certain flammable substances. For example, explosive substances exist in about two-thirds of coal mines; in the chemical industry, explosive substances exist in more than 80% of the production workshop area. In the production process, a large number of electrical instruments are used, and various frictional electric sparks, mechanical wear sparks, static sparks, high temperature, etc., are inevitable, especially when instrumentation and electrical failures occur. At the same time, oxygen in the air is ubiquitous.

Therefore, objectively many industrial sites meet the explosion conditions. When the mixed concentration of explosive substances and oxygen is within the explosive limit, an explosion will occur if there is an explosion source. Therefore, it is necessary to take explosion protection.

I think this Klein Tools 60407RL helmet headlamp is the best explosion-proof headlamp. There are patent-pending accessory mounts on the front and back of the helmet, which can be firmly connected to the Klein headlamp without straps or zipper!
Breathable, padded sweat-wicking belt and top pad for improved comfort and machine washableAdjustable vents can be opened or closed to control air circulation in hot and cold weather.
The unique suspension system uses a flexible open-frame design to provide the best fit and improve air circulation.
Class C and Class 1 helmets with adjustable vents comply with ANSI Z89.1-2014, CSA Z94.1-15; EN397:2012+A1:2012-5.2.4 (lateral deformation-LD); EN12492:2012- 4.2.1.2, 4.2.1.3, 4.2.1.4 (front/rear/side collision)

Explosion-proof headlamp

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