What Is LED Explosion-Proof Lights – The Define Of LED Explosion-Proof Lights

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Explosion-proof lamps refer to lamps that are used in dangerous places where flammable gases and dust exist, and can prevent arcs, sparks and high temperatures that may be generated inside the lamp from igniting flammable gases and dust in the surrounding environment, so as to meet explosion-proof requirements. Also known as explosion-proof lamps, explosion-proof lighting. Different flammable gas mixture environments have different requirements for the explosion-proof level and explosion-proof form of explosion-proof lamps. Refer to GB3836 and IEC60079 for details.

With the rapid development of petroleum, chemical, mining and other industries, lighting fixtures are more and more widely used in production, storage, and rescue, and there are more and more varieties. How to prevent the accidental explosion of lighting fixtures in explosive gas dangerous places has become a very important issue. Since lighting fixtures inevitably generate electric sparks or form hot surfaces during operation, once they meet the explosive gas mixture at the production or rescue site, it will lead to an explosion accident, directly endangering the lives of citizens and the safety of national property.

Therefore, as the most widely used lighting fixture, its explosion-proof technology has already attracted widespread attention and great attention. Aluminum alloy shell with plastic spraying on the surface; dual use for lighting and emergency; built-in maintenance-free nickel-cadmium battery pack, which can be automatically charged under normal power supply, and the emergency light will be automatically lit by accidental power failure or power failure; steel pipe wiring; Lighting and emergency lighting are independent; emergency dual-purpose lighting, normal lighting and emergency lighting share one lamp body, and the light source is independent.

An Internationally-renowned LED Explosion-Proof Lights Manufacturer China

Wonder Light company, an internationally-renowned LED Explosion-Proof Lights manufacturer, was first established in China in 2008. We specialize in the development, production as well as the sale of LED Explosion-Proof Lights, and we have LED Explosion-Proof Lights wholesale operations to companies around the world, especially those in Europe, America and Japan.

Being recognized as the leading LED Explosion-Proof Lights company China, we are your ideal supplier and our long list of satisfied clients throughout the years would certainly attest to this.

Since our establishment as a LED Explosion-Proof Lights supplier China,Wonder has been pursuing the world’s most energy-efficient LED technologies. Currently, our lighting efficiency has successfully reached 260LM/W, making them the brightest in the world. As part of our plans to diversify, we have been working closely with established brands such as NICHIA, CREE and MEANWEELL to create premium and smart LED Explosion-Proof Lights products and brands.

As a national high-tech enterprise, Wonder has achieved official certification for ISO 9001 and ISO14001, with recognized standards such as ENEC, CB, ETL, SAA, CE, ROHS, FCC and PSE. We own more than 20 national patents for our LED Explosion-Proof Lights in China, and our team is driven by innovation, high speed development, as well as strong design capabilities.

Our manufacturing facility is located in zhongshan, China. Our factory includes a foundry plant and assembly workshop that covers 6000 square meters, complete with a modern and cozy office building.

Your Trusted LED Explosion-Proof Lights Supplier

As a reputable LED Explosion-Proof Lights wholesaler China, we supply a variety of indoor and other products to both local and international clients.

Wonder has implemented a very strict quality control process, and have consistently achieved a product quality pass rate of 99.99%. Also, all of our LED light company products have been officially certified by TUV, CB, ENEC, CE, ROHS, SAA, PSE, UL, ETL, and DLC. Consequently, this has allowed us to establish and maintain long-term partnerships with renowned companies such as VDE and TUV.

The Application Range Of Explosion-proof Lamps

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1. Applicable to hazardous areas of Zone 1 and Zone 2 in explosive gas environment;
2. Suitable for IIA, IIB, IIC class explosive gas environment;
3. Suitable for combustible dust environment 20, 21, 22;
4. It is suitable for environments with temperature groups T1-T6.

The Performance Characteristics Of Explosion-proof Lamps

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1. Equipped with T8 LED 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 luminous angle of the LED light source can be precisely controlled to avoid light pollution and ineffective light utilization; the light is soft and no glare, which will not cause eye fatigue of operators and improve work efficiency.
3. The shell is made of lightweight aluminum alloy die-casting, and the surface is treated with high-voltage electrostatic spray.
4. There is a wiring cavity inside the lamp, and there are special wiring terminals. Users can directly enter the line during installation, and there is no need to set up a separate junction box, which is convenient for installation.
5. When replacing the lamp, just fold down the end cap, and the lamp can be replaced directly.
6. The internationally famous brand T5 fluorescent tube can be selected according to customer requirements, which has high luminous efficiency and is more in line with the actual lighting environment. Compared with T8 fluorescent tube, it saves about 30% of electricity.
7. The emergency device can be equipped according to the user’s requirements. The built-in lamp body is light in weight. When the external power is cut off, the lamp automatically switches to the emergency lighting state.

The Lamp Type Classification Of Explosion-proof Lamps

The Classification Of Explosion-Proof Lamps

Explosion-proof lamps are generally classified according to the selected light source, explosion-proof structure type and use method. 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 type of explosion-proof structure, there are explosion-proof lamps, increased safety lamps, composite lamps, etc.; Explosion-proof lamps and portable explosion-proof lamps.

The Types Of Explosion-Proof Lights

According to the explosion-proof type, it is divided into five main types: flameproof 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 various explosion-proof types. .

Flameproof Type D

All parts of the equipment that may ignite the explosive gas mixture are enclosed in a shell, and the shell can withstand the flammable mixture that penetrates through any joint surface or structural gap of the shell, and the flammable mixture penetrates into the shell without being damaged. As the flame gas propagates through the gap, the energy is reduced enough to detonate the gas of the enclosure.

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 prevent the possibility of dangerous temperatures, arcs and sparks from its internal and external components. Protective measures to improve the reliability and safety of the equipment.

Positive Pressure P

Protect the electrical equipment from a static positive pressure inside the system by maintaining the pressure of the shielding gas inside the equipment enclosure above the pressure of the surrounding explosion-proof environment to a safe level or by maintaining a continuous flow of air or inert gas to limit the entry of flammable mixtures into the interior of the enclosure. Take away the flammable gas that enters the casing when the equipment is not under positive pressure to prevent the formation of flammable mixtures in the casing.

This Placement I

All circuits inside the equipment are intrinsically safe circuits in the specified explosion-proof gas atmosphere under standard specified conditions (including normal operation and specified fault conditions).

Encapsulation Type M

The electrical components that may generate sparks, arcs or dangerous temperature parts that may ignite explosive mixtures are encapsulated in a potting agent (composite) so that it cannot ignite surrounding explosive mixtures. The use of potting measures can prevent electrical components Short circuit, cure electrical insulation, avoid sparks on the circuit and ignition such as arcing and dangerous temperatures, prevent the intrusion of explosive mixtures, and control surface temperatures under normal and fault conditions.

Oily O

Immerse the entire equipment or parts of the equipment in the oil I protective liquid, so that it cannot ignite the explosion-proof gas environment above the oil surface or outside the casing.

Sand Filled Type Q

The enclosure is filled with sand grains or other powder materials with specified characteristics, so that under the specified conditions of use, the arc or high temperature generated in the enclosure cannot ignite the surrounding explosive gas environment. Electrical equipment protection type.

Airtight type h This type of explosion-proof equipment adopts an airtight casing. That is, the explosive gas mixture in the environment cannot invade the inside of the equipment casing. Airtight enclosures are sealed by melting, extrusion or gluing, and most of these enclosures are non-removable to ensure permanent tightness.

The Protection Class Of Explosion-proof Lamps

Classified according to the degree of protection of the enclosure: in order to prevent dust, solid foreign objects and water from entering the lamp cavity, touching or accumulating on live parts and causing dangers such as flashover, short circuit or damage to electrical insulation, there are various enclosure protection methods to protect electrical The role of insulation. The enclosure protection level is characterized by the characteristic letter “IP” followed by two numbers. The first number indicates the protection against people, solid foreign objects or dust. Divided into 0-6 grades. Explosion-proof lamps are sealed lamps, and their dust-proof ability is at least grade 4. The second number indicates the protection ability against water, which is divided into grades 0-8.

The Supporting Surface Material Of Explosion-Proof Lamps

Classification according to the supporting surface material of the lamp design: Indoor explosion-proof lamps may be installed on many surfaces of common flammable materials, such as wooden walls and ceilings, which do not allow the temperature of the installation surface of explosion-proof lamps to exceed safe values. According to whether explosion-proof lamps can be directly installed on the surface of ordinary combustible materials, they can be divided into two categories.

One category is luminaires suitable only for installation on non-combustible surfaces.

• The other type is lamps suitable for direct installation on the surface of common combustible materials, with marking symbols.
• In addition, according to the installation and use form, it can be divided into fixed type, movable type and portable type.

The Principle Of Explosion-Proof Lamps

The principle of explosion-proof type is based on the concept of explosion-proof and fire-proof type of 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 explosion and prevent flame propagation. It is an explosion-proof type and is the most commonly used type of explosion-proof. Since the shell of this type of explosion-proof lamp is generally made of metal material, it has good heat dissipation, high shell strength and good durability, and is very popular with users. Moreover, many components of increased safety explosion-proof lamps, such as lamp sockets, interlock switches, etc., also use explosion-proof structures. Electrical equipment with flameproof enclosures is called flameproof electrical equipment. If an explosive gas mixture enters the flameproof enclosure and is ignited, the flameproof enclosure can withstand the explosion pressure of the explosive gas mixture inside and prevent the internal explosion from propagating to the explosive mixture around the enclosure. This is a gap explosion-proof principle, that is, a structure designed on the principle that the metal gap can prevent the spread of the explosion flame and cool the temperature of the explosion product, achieve flame extinguishing and cooling, and suppress the expansion of the explosion.

The Design Of Explosion-Proof Lamps

When designing the structure of flameproof lamps, 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 form an integral part of the enclosure. Design of other devices. Below, according to the requirements of GB3838.2-2000 “Electrical Equipment for Explosive Gas Environments Part 1: Flameproof Type “d””, some issues that need attention in structural design are analyzed:

Shell Fasteners

There are two types of bolted flameproof enclosures: flat and spigot. For the plane structure, the bolts not only perform the tightening operation, but also ensure the plane clearance. For the stop structure, when the flameproof surface only considers the cylinder part, the bolts only play the role of tightening; when the flameproof surface needs to consider the cylinder plus the plane, the bolts not only play the role of tightening, but also ensure the clearance of the plane part.

When tapping directly on the shell, it must be noted that the screw holes of the fasteners should not pass through the flameproof shell as far as possible, and a margin of more than 3mm should be left at the bottom of the screw holes when passing through the shell; When the shell is exploded, due to the low strength of the aluminum alloy, when using screws to fasten the flameproof shell that is frequently opened (such as replacing the light source), the aluminum alloy shell should not be directly tapped, and should be embedded to prevent loosening.

The inner and outer threaded steel sleeves are used to increase the strength of the screw holes and prevent the thread from failing due to rotten teeth; users do not need to open the light source during replacement or maintenance, and the bolts that have been installed at the factory can be directly tapped and tightened on the shell. Screw holes, but fine threads cannot be used, and coarse threads should be used as much as possible, and there are enough meshing buttons to meet the tightening requirements.

In short, when designing shell fasteners, it is necessary to first distinguish its function in the flameproof shell, whether it is only for tightening, or both for tightening and ensuring the plane clearance, and then determine the maximum axial direction of the bolt. Select appropriate bolts for the load.

Entry method of cables and wires

The introduction of cables and wires can be connected in the following two ways:

• a) Indirect introduction, connected by junction box or plug-in device;
• b) Direct introduction, the connection method of connecting cables and wires directly into the main shell. It is worth noting that combustion or explosion can occur directly when the sealing ring is aged or not pressed tightly.

Therefore, explosion-proof lamps that generate 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” are classified as Class IIC explosion-proof lamps are not suitable for Adopt elastic sealing ring compression type direct introduction method. Although GB3836.2 does not specify this, GB3836.15-2000 “Electrical Equipment for Explosive Gas Atmospheres – Part 15: Electrical Installation in Hazardous Locations (Except Coal Mine)” stipulates this. If the cable introduced into the luminaire through the lead-in device is likely to be pulled during the entire process from installation to use, add a cable anti-pull-off pressure plate on the compression nut of the lead-in device or inside the lamp near the lead-in device to prevent the force from being transmitted to the terminal. up and prevent possible movement of the cable, and prevent poor contact or failure of the electrical connection. Lamps may need to provide more than one introduction device in the design to facilitate users’ different installation requirements. When leaving the factory, all the introduction devices should be installed with blocking parts, and the structure of the blocking parts must be suitable for the explosion-proof type. Alternatively, install only one lead-in and replace the remaining holes (with the lead-in removed) with bulkheads suitable for the 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 Parts Installation

Explosion-proof lamps are inseparable from transparent parts, and transparent parts are the parts with the lowest strength in the shell parts, so whether the installation of transparent parts is reliable directly affects the safety performance of explosion-proof lamps.

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

• a) Sealed directly in the housing, forming a single piece with the housing. This method is simple, practical and widely used. The sealing material should be a temperature-resistant and oil-resistant rubber part, or use an adhesive such as epoxy resin to seal the transparent part in the casing and press it tightly.
• b) Fasten the transparent part directly in the casing with or without a gasket. When the gasket is not used, the flatness of the joint surface of the transparent part is very high, and it is generally suitable for small flat glass and the joint part of the glass is ground at the same time, otherwise the glass will be unevenly stressed and easily broken.
• c) Sealed or glued to a frame, which is fastened inside the housing, so that the transparent piece can be replaced as a whole. This structure is rarely used in lamps, and in some large-scale equipment that requires frequent replacement of transparent parts, the transparent parts and the frame are replaced as an integral part.

The sealing between 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 directly transmitted to the metal shell as far as possible. It is inappropriate to transmit it to the metal shell through the pressure plate and/or screw of the transparent part. Can not be stressed, so as to ensure the reliable combination of the transparent part and the shell.

How To Select LED Explosion-Proof Lights

Select The Model Of The LED Explosion-Proof Light

The selection, installation, use and maintenance of explosion-proof lamps are all indispensable links to ensure the long-term safety, reliability and efficient operation of explosion-proof lamps, and must be given full attention.

1. The selection personnel must understand the basic working principle of explosion-proof lamps and be familiar with explosion-proof signs.
2. Accurately select the explosion-proof category, type, level and temperature group of the lamps according to the level of the explosive hazardous location.
3. Understand the environmental conditions and work requirements, and reasonably choose explosion-proof lamps with various functions. For example, the enclosure protection level of explosion-proof lamps used outdoors is at least IP43. In places where color identification is required, high-pressure mercury lamps and high-pressure sodium lamps cannot be used for explosion-proof lamps, because these two light sources have poor color rendering.
4. Read the product instruction manual in detail to understand the product’s performance, precautions and product limitations, and understand the contents of all signs of the product. If there is an “x” symbol after the explosion-proof certificate number, it means that the lamp has a specific applicable place. You should refer to the product instruction manual and nameplate to clarify the applicable place requirements.

Light Source Selection Of LED Explosion-Proof Lamps

Although incandescent lamps are still widely used, they are gradually being replaced by other light sources due to their low luminous efficiency and short lifespan. Among them, single-plug starterless fluorescent lamps and self-ballasted high-pressure mercury lamps and high-pressure sodium lamps are widely used.

The single-plug starterless fluorescent lamp is a cold-cathode gas discharge lamp. The light-emitting principle is to use the discharge between the electrodes to make the mercury atoms generate ultraviolet radiation, thereby exciting the fluorescent material on the inner wall of the lamp to emit light. This kind of fluorescent lamp has high luminous efficiency (about 3 times that of incandescent lamps), long service life, and does not require a starter when starting (usually there is a conductive layer on the wall of the lamp tube, called the ignition layer, the ignition of fluorescent lamps It is done by it; when the lamp tube is broken, the glow layer is also destroyed, and the lamp is extinguished), the cathode temperature is low (about 200 ℃), it is a safe and practical light source, and it is very suitable for making safety-enhancing lighting fixtures . The self-ballasted high-pressure mercury lamp is a mixed light source lamp that utilizes high-pressure mercury vapor discharge and three kinds of incandescent body and phosphor to emit light. It has the advantages of high brightness, simple structure and fast starting speed.

It has changed the shortcomings of the previous high-pressure mercury lamps that require additional ballasts, and uses tungsten filaments to limit the current and improve the light color. The disadvantage is that the life is shorter than that of ordinary fluorescent high-pressure mercury lamps. High-pressure sodium lamp is a high-pressure sodium vapor discharge lamp, which has the advantages of high luminous efficiency, low power consumption, strong fog-penetrating ability and long life.

The author’s production unit mainly uses single-plug starterless fluorescent lamps and self-ballasted high-pressure mercury lamps. For the original fixed explosion-proof incandescent lamps, in the case of meeting the minimum distance between the bulb and the transparent cover stipulated in the regulations, approved by the relevant units, the incandescent bulbs were replaced with self-ballasted high-pressure mercury bulbs by the original lamps. Although high-pressure sodium lamps have certain energy-saving effects, due to their poor color rendering, we generally do not use them in production devices, but only use them in road lighting. Sometimes in order to improve the straight white light color emitted by the high-pressure mercury lamp, some high-pressure sodium lamps can also be mixed in the production device. For places requiring high-intensity lighting with good color rendering (such as on-site maintenance of large unit equipment), explosion-proof floodlights can be selected. The light source is generally metal halide lamps, and the rated power can reach more than 1000W.

The Structure Type Of LED Explosion-Proof Light

The explosion-proof structure type of explosion-proof lamps should be determined according to the regional level and scope of the explosive gas environment. For example, explosion-proof lamps must be used in zone 1; fixed lamps in zone 2 can be explosion-proof and increased safety type, and mobile lamps must be used. Use explosion-proof type. The level or group of the selected explosion-proof lamp should not be lower than the level and group of the explosive mixture in the explosion-hazardous environment. At the same time, the influence of the environment on the explosion-proof lamp should be considered, and it should meet the requirements of various environments such as ambient temperature, air humidity, corrosive or polluting substances. The protection level and anti-corrosion level of lamps and lanterns should be selected according to different environmental requirements. Especially in the presence of corrosive gases in explosive gas environments, it is crucial to choose lamps with corresponding anti-corrosion properties.

In the past, in petrochemical enterprises, explosion-proof lighting was mainly used in explosion-hazardous places. With the wide application of increased-safety electrical equipment in Zone 2 explosion hazard areas, increased-safety and composite lighting fixtures are also being used more and more. On the basis of certain explosion-proof performance, the increased safety lamps have the advantages of light weight, low price, convenient installation and maintenance, and long service life compared with explosion-proof lamps. The most common composite electrical equipment used in petrochemical enterprises is increased safety-explosion-proof composite explosion-proof electrical equipment, which generally consists of three parts: flameproof components, increased safety terminals and increased safety enclosures. performance, but also has the advantages of increased safety.