According to the requirements of national standards GB3836 and GB12476, the explosion-proof enclosure of explosion-proof electrical equipment must meet the following four design requirements:
1. IP protection level requirements
For explosion-proof enclosures, the enclosures of dust explosion-proof electrical equipment must meet two types of requirements:
① Dust tight shell: The structure of the shell is designed as a dust-proof structure, and dust cannot enter. The shell's ability to prevent foreign objects is level 6.
② Dustproof enclosure: It cannot completely prevent dust from entering, but the amount of entry is not enough to affect the normal operation of electrical equipment. The enclosure's ability to prevent foreign objects is level 5.
The gas explosion-proof shell requires that the protective ability of the shell must reach IP54 or above.
Intrinsic safety typeexplosion-proofThe requirements for the shell are relatively low, only IP20 or above is needed.
2. Material selection requirements
For explosion-proof enclosures, it is required that the enclosure material should have good thermal stability, sufficient strength, and be able to withstand explosive pressure without damage or deformationExplosion proofThe joint surface should be able to withstand explosions without transmitting them. Generally, materials such as cast iron, carbon steel, stainless steel, etc. can be used.
3. Requirements for non-metallic components
The non-metallic components of the explosion-proof enclosure should be able to meet the heat and cold resistance requirements, light aging, flame ablation tests, etc. of relevant standards
4. Appearance requirements for the shell
The surface coating of the explosion-proof shell should be smooth, intact, free of rust and mold, and the nameplate should be complete and clear.
It should be noted that the explosion-proof electrical equipment used in ordinary chemical plants may not necessarily meet the requirements for underground use in coal mines. There are differences in the requirements for explosion-proof enclosures in mining and factory use. For more details, please consult furtherZhongnuo Testing！
 |
||||||
 |
||||||
|
||||||
 |
||||||
|
||||||
 |
