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      防爆電器的意義及原理

      2018-06-21 08:54:34  來源:騰防爆技術部

      防爆電器按其使用場所不同分為礦用和工廠用兩大類,防爆電器按其電壓等級分為高壓防爆電器和低壓防爆電器(凡電壓在1140V以下的均為低壓電器兒防爆電器品種規格很多,更多的時候是按其品種、用途、型式等具體分類。其小漬電開關,起動器、繼電器、主令電器、電磁鐵、插銷、接線盒七大類產品用量較大,應用廣泛,均各自成一大類,把壁掛式工廠用組合電器和體積在一立方米以下的礦用組合電器,定為防爆箱,對落地式工廠用組合電器和體積在一立方米以上的礦用組合電器,定為防爆柜;對由多個獨立的防爆電器組成的成套電器,列為防爆電控設備類、


      防爆原理
      為了防止產生爆炸和火災危險,應該在上述場所中采取防爆措施。防爆措施在工程上分為兩大類:
      1.防爆措施--避免場所環境中存在爆炸性危險環境。 由前述的產生爆炸或燃燒條件三要素可以知道,如果能夠在環境中避免可燃性物質,或者在環境中避免氧化劑—氧氣,就可以從根本上避免火災或爆炸危險?諝庵械难鯕馐请y避免的,可行的辦法是避免可燃性物質;S常常采用有房頂無墻壁的廠房,改善自然通風效果,或者采用強制通風(機械通風),使環境中的可燃性物質的濃度低于爆炸下限,達到避免爆炸危險的目的。



      2. 防爆措施----在爆炸危險環境避免點燃源。

      如果爆炸性危險環境不可避免,則在環境中消除點燃源。我們常常在油庫、加油站中看到“嚴禁煙火”的牌子,就屬于二次防爆措施。國家標準規定,在爆炸危險場所必須使用防爆電氣產品,這也屬于二次防爆措施。 根據燃燒和爆炸條件三要素,可以采取不同的防爆措施,避免電氣設備成為點燃源。實現防爆的原理就是消除三要素中的任一要素,從而實現防止爆炸。

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