Explosion-proof cameras, by definition, can prevent explosions. In China's national standard GB3836.1-2000 for explosive gas atmosphere electrical equipment and GB3836.2-9 standard, there is a clear definition of explosion-proof grade. And most of the anti-explosion grade parameters formulated by China are higher than European, American and international standards, which shows that China's management of explosion-proof equipment is very strict.
At present, there are three types of explosion-proof cameras on the market: intrinsically safe, positive pressure, and flameproof.
"Intrinsically safe" starts from limiting the energy in the circuit. Inside the camera, the potential spark energy is reduced to the ignitable prescribed gas mixture energy through reliable control circuit parameters. The wire and the surface temperature of the component are limited to the specified gas mixture. The lighting temperature. All circuits inside the camera are intrinsically safe circuits that cannot ignite a prescribed explosive gas atmosphere by any spark or any thermal effect that occurs under standard conditions (including normal operation and specified fault conditions) due to "intrinsically safe "Cameras" are relatively expensive and are rarely seen on the market.
The "positive pressure type" explosion-proof type is to maintain continuous air or inert gas in the camera to restrict the flammable mixture from entering the camera through the housing.
The most common type of explosion-proof camera on the market today is a “flameproof type†explosion-proof type, which completely encloses the parts of the camera that could ignite the explosive gas mixture in a single enclosure. The enclosure can withstand any joint or structural gap through the enclosure. The flammable mixture that penetrates into the interior of the enclosure explodes internally without damage and does not cause ignition of an external explosive atmosphere formed by one or more gases or vapours. Place parts of the camera that may produce sparks, arcs, and dangerous temperatures into a flameproof enclosure that isolates the interior of the camera from the surrounding environment. There is a gap in the flameproof enclosure. Due to the respiration of the electrical equipment and the gas permeation, an explosive gas mixture may exist inside. When the explosion occurs, the enclosure can withstand the explosion pressure generated without damage, and at the same time, the gap of the shell structure can cool the flame and lower the flame. The speed of flame propagation or the acceleration of the chain is such that flame or dangerous flame products cannot ignite the external explosive atmosphere through the flameproof gap, thereby achieving the purpose of flameproof.
In fact, there are almost the same elements needed to produce an explosion and produce combustion. Three conditions must be met at the same time. First, there must be explosive substances or flammable substances; second, there must be flammable substances, mainly oxygen in the air; Third, there must be a source of ignition (such as sparks, arcs, and dangerous temperatures) that provide the energy necessary to ignite the mixture. Only if these three conditions exist at the same time will there be the possibility of an explosion. If any of these conditions is not met, there will be no burning or explosion. In the mines, chemical plants, military factories, arsenals, oil fields, oil depots and other dangerous goods production or storage, the first two conditions basically have, the third condition is the camera from the introduction of the project, because the sealing performance of ordinary cameras It is impossible to prevent the inflammable gas from entering the body, and the electronic components of ordinary cameras may generate sparks, arcs, and dangerous temperatures during normal operation. Therefore, combustible gases that enter the casing are encountered. The cameras installed in this way are not only unsafe. The original intention was to become a time bomb. The real explosion-proof camera manufacturing principle is also nothing more than to make the above three conditions not available at the same time, it really played the role of explosion-proof.
As people's safety awareness gradually increases, the field of application of anti-explosion-proof cameras should be wider and wider in theory, but in fact, the amount of explosion-proof cameras is not very large. Why?
1. The most important reason is cost. The price of an explosion-proof camera is a lot higher than that of an ordinary camera with the same parameters. Domestic engineering companies and users do not have a high degree of acceptance of these high-priced products. They still need time to cultivate and change their consumer attitudes and awareness, which greatly restricts the popularity of explosion-proof cameras.
2. The second reason is that there is not enough awareness of the need for 'explosion protection'.
3. The third reason is that surrounding facilities are not "explosion-proof". Even if an explosion-proof camera is not equipped with explosion-proof back-end equipment or professional construction, it will not be able to exert the effect of explosion-proof. For example, explosion-proof heads are not used, or the transmission wires are exposed and there are potential safety hazards.
At present, there are three types of explosion-proof cameras on the market: intrinsically safe, positive pressure, and flameproof.
"Intrinsically safe" starts from limiting the energy in the circuit. Inside the camera, the potential spark energy is reduced to the ignitable prescribed gas mixture energy through reliable control circuit parameters. The wire and the surface temperature of the component are limited to the specified gas mixture. The lighting temperature. All circuits inside the camera are intrinsically safe circuits that cannot ignite a prescribed explosive gas atmosphere by any spark or any thermal effect that occurs under standard conditions (including normal operation and specified fault conditions) due to "intrinsically safe "Cameras" are relatively expensive and are rarely seen on the market.
The "positive pressure type" explosion-proof type is to maintain continuous air or inert gas in the camera to restrict the flammable mixture from entering the camera through the housing.
The most common type of explosion-proof camera on the market today is a “flameproof type†explosion-proof type, which completely encloses the parts of the camera that could ignite the explosive gas mixture in a single enclosure. The enclosure can withstand any joint or structural gap through the enclosure. The flammable mixture that penetrates into the interior of the enclosure explodes internally without damage and does not cause ignition of an external explosive atmosphere formed by one or more gases or vapours. Place parts of the camera that may produce sparks, arcs, and dangerous temperatures into a flameproof enclosure that isolates the interior of the camera from the surrounding environment. There is a gap in the flameproof enclosure. Due to the respiration of the electrical equipment and the gas permeation, an explosive gas mixture may exist inside. When the explosion occurs, the enclosure can withstand the explosion pressure generated without damage, and at the same time, the gap of the shell structure can cool the flame and lower the flame. The speed of flame propagation or the acceleration of the chain is such that flame or dangerous flame products cannot ignite the external explosive atmosphere through the flameproof gap, thereby achieving the purpose of flameproof.
In fact, there are almost the same elements needed to produce an explosion and produce combustion. Three conditions must be met at the same time. First, there must be explosive substances or flammable substances; second, there must be flammable substances, mainly oxygen in the air; Third, there must be a source of ignition (such as sparks, arcs, and dangerous temperatures) that provide the energy necessary to ignite the mixture. Only if these three conditions exist at the same time will there be the possibility of an explosion. If any of these conditions is not met, there will be no burning or explosion. In the mines, chemical plants, military factories, arsenals, oil fields, oil depots and other dangerous goods production or storage, the first two conditions basically have, the third condition is the camera from the introduction of the project, because the sealing performance of ordinary cameras It is impossible to prevent the inflammable gas from entering the body, and the electronic components of ordinary cameras may generate sparks, arcs, and dangerous temperatures during normal operation. Therefore, combustible gases that enter the casing are encountered. The cameras installed in this way are not only unsafe. The original intention was to become a time bomb. The real explosion-proof camera manufacturing principle is also nothing more than to make the above three conditions not available at the same time, it really played the role of explosion-proof.
As people's safety awareness gradually increases, the field of application of anti-explosion-proof cameras should be wider and wider in theory, but in fact, the amount of explosion-proof cameras is not very large. Why?
1. The most important reason is cost. The price of an explosion-proof camera is a lot higher than that of an ordinary camera with the same parameters. Domestic engineering companies and users do not have a high degree of acceptance of these high-priced products. They still need time to cultivate and change their consumer attitudes and awareness, which greatly restricts the popularity of explosion-proof cameras.
2. The second reason is that there is not enough awareness of the need for 'explosion protection'.
3. The third reason is that surrounding facilities are not "explosion-proof". Even if an explosion-proof camera is not equipped with explosion-proof back-end equipment or professional construction, it will not be able to exert the effect of explosion-proof. For example, explosion-proof heads are not used, or the transmission wires are exposed and there are potential safety hazards.
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