d為隔爆型的編號(hào),在防爆標(biāo)志中代表隔爆,這也是目前市面上應(yīng)用較廣泛的一種防爆型式,具備安全可靠的特點(diǎn),但如果在現(xiàn)場(chǎng)安裝的時(shí)候不注意以下要求,很有可能成為一顆“定時(shí)炸彈”。

隔爆型”d”的安裝要求
安裝設(shè)備時(shí),隔爆接合面與固體障礙之間的距離應(yīng)大于下表的規(guī)定數(shù)值;若距離更小時(shí),需提供相關(guān)試驗(yàn)證明材料。
| 氣體分類 | 最小距離/mm |
|---|---|
| ⅡA | 10 |
| ⅡB | 30 |
| ⅡC | 40 |
- 隔爆接合面的緊固螺栓不得任意更換,彈簧墊圈應(yīng)齊全。
- 如果是隔爆型電機(jī)設(shè)備,它的軸與軸孔、風(fēng)扇與端罩之間在正常工作狀態(tài)下,不應(yīng)產(chǎn)生碰擦。
- 電纜和導(dǎo)管引入系統(tǒng)應(yīng)保證隔爆外殼的整體防爆性能;導(dǎo)管與隔爆外殼至少嚙合5扣。
- 電氣設(shè)備的電纜或?qū)Ь€引入口需用鋼管連接時(shí),宜用一個(gè)過渡壓緊元件,達(dá)到先壓緊密封圈后才可連接鋼管,鋼管連接有困難時(shí)可增加活接頭。
- 如果外殼專門設(shè)計(jì)用于導(dǎo)管連接而改用電纜連接,可用一個(gè)帶有絕緣套管和接線盒的隔爆型轉(zhuǎn)接器,通過導(dǎo)管與外殼連接,導(dǎo)管長(zhǎng)度不超過50mm。電纜再連接到接線盒中,而且應(yīng)符合接線盒相應(yīng)防爆型式的要求。
- 由變頻器和調(diào)壓電源供電的電機(jī),應(yīng)按照電機(jī)的有關(guān)標(biāo)準(zhǔn)規(guī)定埋入溫度傳感器,對(duì)溫度進(jìn)行直接控制或采用其他有效限制電機(jī)外殼表面溫度的措施;保護(hù)裝置動(dòng)作應(yīng)能使電機(jī)斷電。
- 電氣設(shè)備外殼表面溫度不應(yīng)超過本設(shè)備防爆標(biāo)志的溫度組別。
- 電氣設(shè)備結(jié)構(gòu)不存在可見的未經(jīng)批準(zhǔn)的修改。
算上隔爆接合面與固體障礙之間的距離要求,一共9點(diǎn),概括了大部分隔爆型設(shè)備的安裝要求以及注意事項(xiàng),在現(xiàn)場(chǎng)防爆電氣設(shè)備安全檢測(cè)的時(shí)候,工程師也會(huì)按照上述內(nèi)容進(jìn)行檢測(cè)。









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