早乙女由依动态

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防爆形式

发表时间：2019-04-15 13:09

1.本安型 “i”（本质安全型电气设备及其关联设备）本质安全电路:

在規定的試驗條件下，正常工作或規定的故障狀態下産生的電火花和熱效應均不能點燃規定的爆炸性氣體或蒸汽的電路。

本質安全型電氣設備：全部電路爲本質安全的電氣設備。

本安型設備和關聯設備的本質安全部分分爲ia和ib：

¨ ia：正常工作 + 一个故障 + 任意组合的两个故障均不能引起点燃的电气设备。

¨ ib：正常工作 + 一个故障条件下不能引起点燃的本质安全型电气设备。

由此可見ia等級高于ib等級

關聯設備：裝有本質安全電路和非本質安全電路，且結構是非本質安全電路不能對本質安全電路産生不利影響的電器設備。

2. 隔爆型 “d” 具有隔爆外壳的电气设备。

它能承受已進入外殼內部的可燃性混合物內部爆炸而不受損壞，並且通過外殼上的任何接合面或孔不會引燃由一種或多種氣體或蒸汽所形成的外部爆炸性環境的電氣設備外殼。

3．增安型 e

4．充油型 o

5．充砂型 q

6．浇封型 m

7．複合型

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