For flameproof lamps, the flameproof enclosure is the key component of this type of flameproof explosion-proof electrical equipment, so the flameproof enclosure must meet the general requirements and special requirements for flameproof performance.

1. General requirements

Explosion-proof lamps are special lamps that must meet the general requirements of ordinary lamps.

1.1 The shell shape of lamps and lanterns strives to be elegant, compact and reliable in structure, light and good in craftsmanship.

1.2 It is required to have enough volume for placing lamp sockets, bulbs, reflectors, terminals and other electrical components and lighting accessories. At the same time, the rationality of the layout should be considered, which is convenient for installation, replacement of light sources and other use and maintenance.

1.3 There should be a transparent part with a certain surface area, so that the luminous flux of the light source inside the lamp can be effectively projected through the reflective part.

1.4 Comprehensive consideration should be given to measures such as heat dissipation, dustproof, waterproof and anti-corrosion, and sufficient guarantees should be given to the structure.

1.5 In the appropriate position, the internal and external grounding shall be arranged reasonably, and there shall be corresponding grounding signs.

2. special requirements

The national explosion-proof standard of flameproof enclosure requires that it can withstand the explosion pressure of the internal explosive gas mixture and prevent the internal explosion flame from spreading to the explosive mixture around the enclosure; to meet this performance, the following special requirements must be specifically considered:

2.1 Explosion resistance performance. The shell of the lamp is required to have sufficient strength and rigidity to withstand the explosion pressure that may be caused by the inner cavity of the lamp. Therefore, appropriate materials and wall thicknesses should be selected to form a reasonable three-dimensional geometry distribution. This cavity structure should be both beautiful and elegant. To avoid the uneven stress caused by excessive shape change as much as possible, it can pass the dynamic strength test specified in GB3836.2.

2.2 Explosion-proof function. The flameproof shell of the lamp must be designed in strict accordance with the provisions of GB3836.2 to select the appropriate flameproof joint surface structural parameters, the way of introducing the device, the sealing structure of the transparent part and the lamp body parts, and the flameproof joint surface roughness. , The accuracy of the flameproof thread, etc., in order to effectively prevent the internal explosion flame from spreading to the explosive mixture around the shell, and pass the flameproof performance test specified in GB3836.2.

2.3 Most of the flameproof enclosures of lamps are composed of 2 or more connected cavities, which are often prone to pressure overlap. Generally speaking, this will cause the explosion pressure to rise abnormally and sharply and exceed the expected pressure. . To this end, the area of the communication hole should be increased as much as possible, so that the shape of the inner casing can offset the pressure overlapping phenomenon. If the pressure overlap phenomenon cannot be offset in practice, explosion-proof measures should be taken between the chambers to offset the pressure overlap.

2.4 For IIC flameproof lamps, GB3836.2 strictly stipulates that the plane flameproof joint surface whose flameproof gap tends to increase during explosion should not be used. Explosive thread structure, so that the lamp cavity can be opened smoothly when the lamp is replaced or repaired.