電動執行器、氣動執行器、液動執行器優劣之比較-浙江博科閥門科技有限公司_hot电竞

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    您的位置:博科氣動閥門 >> 新聞中心 >> 氣動執行器知識 >> 電動執行器、氣動執行器、液動執行器優劣之比較 新聞中心

    電動執行器、氣動執行器、液動執行器優劣之比較

    [來源:原創] [作者:admin] [日期:15-09-22] [點擊:]

    調節閥所用執行器不外乎氣動、電動、液動(電液動)這三種,其使用性能各有優劣,下面分述之。
    1、氣動執行機構:現今大多數工控場合所用執行器都是氣動執行機構,因為用氣源做動力,相較之下,比電動和液動要經濟實惠,且結構簡單,易于掌握和維護。由維護觀點來看,氣動執行機構比其它類型的執行機構易于操作和校定,在現場也可以很容易實現正反左右的互換。它最大的優點是安全,當使用定位器時,對于易燃易爆環境是理想的,而電訊号如果不是防爆的或本質安全的則有潛在的因打火而引發火災的危險。所以,雖然現在電動調節閥應用範圍越來越廣,但是在化工領域,氣動調節閥還是占據着絕對的優勢。
    氣動執行機構的主要缺點就是:響應較慢,控制精度欠佳,抗偏離能力較差,這是因為氣體的可壓縮性,尤其是使用大的氣動執行機構時,空氣填滿氣缸和排空需要時間。但這應該不成問題,因為許多工況中不要求高度的控制精度和極快速的響應以及抗偏離能力。
    2、電動執行機構:電動執行機構主要應用于動力廠或核動力廠,因為在高壓水系統需要一個平滑、穩定和緩慢的過程。電動執行機構的主要優點就是高度的穩定和用戶可應用的恒定的推力,最大執行器産生的推力可高達225000kgf,能達到這麼大推力的隻有液動執行器,但液動執行器造價要比電動高很多。電動執行器的抗偏離能力是很好的,輸出的推力或力矩基本上是恒定的,可以很好的克服介質的不平衡力,達到對工藝參數的準确控制,所以控制精度比氣動執行器要高。如果配用伺服放大器,可以很容易地實現正反作用的互換,也可以輕松設定斷信号閥位狀态(保持/全開/全關),而故障時,一定停留在原位,這是氣動執行器所作不到,氣動執行器必須借助于一套組合保護系統來實現保位。
    電動執行機構的缺點主要有:結構較複雜,更容易發生故障,且由于它的複雜性,對現場維護人員的技術要求就相對要高一些;電機運行要産生熱,如果調節太頻繁,容易造成電機過熱,産生熱保護,同時也會加大對減速齒輪的磨損;另外就是運行較慢,從調節器輸出一個信号,到調節閥響應而運動到那個相應的位置,需要較長的時間,這是它不如氣動、液動執行器的地方。
    3、液動執行機構:當需要異常的抗偏離能力和高的推力以及快的形成速度時,我們往往選用液動或電液執行機構。因為液體的不可壓縮性,采用液動執行器的優點就是較優的抗偏離能力,這對于調節工況是很重要的,因為當調節元件接近閥座時節流工況是不穩定的,越是壓差大,這種情況越厲害。另外,液動執行機構運行起來非常平穩,響應快,所以能實現高精度的控制。電液動執行機構是将電機、油泵、電液伺服閥集成于一體,隻要接入電源和控制信号即可工作,而液動執行器和氣缸相近,隻是比氣缸能耐更高的壓力,它的工作需要外部的液壓系統,工廠中需要配備液壓站和輸油管路,相比之下,還是電液執行器更方便一些。
    液動執行機構的主要缺點就是造價昂貴,體檢龐大笨重,特别複雜和需要專門工程,所以大多數都用在一些諸如電廠、石化等比較特殊的場合。

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