As a part of modern factory lighting, the explosion-proof lamp has been widely concerned. Among them, safety is the focus of attention, and the explosion-proof lamp product features are reflected in its explosion-proof performance. There are five common types of explosion-proof lamps. What are the differences?
1. Isolate & proof type
Isolate & proof type is a structure of a type of equipment that means that the equipment has a strong enough shell to withstand the internal explosive gas mixture to generate the maximum explosion pressure of 1.5 times and not less than 3.5 × 10pa impact.
Ensure that no deformation or damage, no permanent deformation, and have a particular structural gap to allow the combustion generation ejected through a certain length of flange cooling to a temperature lower than the external explosive mixture of spontaneous combustion, to achieve the purpose of explosion-proof.
2. Safety-enhancing type:
explosion-proof electrical equipment structure refers to the use of a series of safety measures on the equipment, such as the use of high-quality insulation materials, reduction of temperature rise, increase in the electrical gap, improvement of the quality of wire connections, etc …
Make it the maximum not to produce sparks, arcs, or dangerous temperature, or use practical protection components so that the spark, electric arc, or temperature cannot ignite the explosive mixture to achieve the purpose of being explosion-proof.
3. Positive pressure type:
It’s one structure of Explosion-proof electrical equipment, which refers to the internal inflatable to ensure that the internal protective gas pressure is higher than the surrounding, to avoid the explosive mixture into the shell, or a sufficient amount of protective gas through the surface so that reduced the concentration of the internal flammable medicine below the lower explosive limit.
In general, the interior of electrical equipment must not have a dead end of ventilation that affects safety. In regular operation, the wind or inflatable air pressure must not be lower than a specific value. Otherwise, an alarm will be issued immediately, or the power supply will be cut off automatically.
Sparks and arcs inside the equipment shall not be allowed to blow out from any gap at the beginning or air outlet. Favorable pressure structure in the use of the level of explosive substances, primarily used in the internal components of easily damaged equipment or sizeable electrical equipment, or the self-ignition point of T4, T5 for the object is complicated to make other explosion-proof structures of electrical equipment.
4. Non-sparking Type:
Under normal operating conditions, it will not ignite the surrounding explosive mixture and generally will not occur with the ignition of the failure of electrical equipment called non-sparking.
5. Dust type:
The normal production process can produce dust clouds or dust layers of explosive and combustible substances. When mixed with air to a specific concentration, this environment must choose the “dust-tight” shell so that the dust shall not enter the body. Because the surface of the electrical components may generate arcs, sparks ignite the dust and form an explosion.
Workplace and safety requirements are different. The design category is also not the same