要實現(xiàn)電磁閥密封要求,首先要保證主要密封件的結(jié)a構(gòu)設(shè)計合理,加工容易保證。參考進口減壓閥的工作原理,進行了如下改進設(shè)計。 

費斯托FESTO電磁閥閥桿的設(shè)計 

     FESTO進口電磁閥的密封形式是利用閥桿兩端錐面,通過閥桿的移動分別密封入口端和放氣口端。這種密封形式要求閥桿的加工精度很高,特別是閥桿兩端錐面的同軸度要求在0.01mm以內(nèi)。這兩錐面用一般數(shù)控機床加工必須經(jīng)過在兩次定位分別加工,錐面同軸度要求很難保證,因此進口電磁閥在使用過程中性能很不穩(wěn)定,使用壽命較短,而國內(nèi)傳統(tǒng)電磁閥只能應(yīng)用于低壓工作范圍。

在電磁閥的設(shè)計當中,通過改變閥桿結(jié)構(gòu)形式,將原來閥桿兩端錐面密封形式改為一側(cè)端面密封,另一側(cè)保持錐面密封。這樣錐面的同軸度和端面的垂直度和跳動度用普通數(shù)控機床可以在一次定位中加工出來,閥桿的設(shè)計精度就比較容易保證,同時降低了加工成本。圖3為閥桿改型設(shè)計簡圖。 

費斯托FESTO電磁閥密封力的設(shè)計 

     在電磁閥設(shè)計中,引進氣動密封力概念,即通過改變進氣口兩端面的橫截面積S1、S2,使截面S1>S2,在通入高壓氣體P0時,作用在兩截面的氣體壓力分別是: 

                                  F′1=P0·S1 

                                  F′2=P0·S2 

     這樣,當電磁閥閉合時,由于兩截面均密封,在截面兩端形成壓力差F′1-F′2,產(chǎn)生氣動密封。此時電磁閥閉合時的密封力由氣體密封力和彈簧力共同提供,既保證了電磁閥閉合時所需要的密封力,同時可以降低了彈簧的設(shè)計強度,延長彈簧的使用壽命。

費斯托FESTO電磁閥常用產(chǎn)品型號如下：

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