An effective method to prevent a decrease in the sealing performance of explosion-proof conversion switches
一种有效防止隔爆转换开关密封性能降低的方法

摘要

针对隔爆转换开关在高湿度工作环境下出现的密封性能下降导致渗水等问题，对该产品采用的密封材料丁腈橡胶在高湿度环境下进行密封性能探究。为了强化密封效果，除了密封圈外，另采用室温固化有机硅橡胶和液态密封胶对密封面进行辅助密封处理。同时对丁腈型液态密封胶和708有机硅橡胶的密封性能进行了试验，并对其在高湿度条件下所表现出的密封性能进行了评判。结果表明：高湿度环境下单独使用丁腈密封圈依然在存在渗水漏水情况，但搭配或者单独使用丁腈型液态密封胶或708有机硅橡胶后，无渗漏情况。

Abstract

Aiming at the problem of water seepage due to the decline of sealing performance of the explosion-proof changeover switch under the high humidity working environment, the sealing performance of nitrile rubber, the sealing material used in this product, is investigated. In order to strengthen the sealing effect, in addition to the sealing ring, another room temperature curing silicone rubber and liquid sealant are used to seal the sealing surface for auxiliary sealing treatment. At the same time, the sealing performance of nitrile liquid sealant and 708 silicone rubber was tested and judged under high humidity conditions. The results show that: nitrile seals alone under high humidity environment still in the existence of seepage and leakage, but with or alone use of nitrile liquid sealant or 708 silicone rubber, no seepage and leakage.