要實現電磁閥密封要求,首先要保證主要密封件的結a構設計合理,加工容易保證。參考進口減壓閥的工作原理,進行了如下改進設計。 

費斯托FESTO電磁閥閥桿的設計 

     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。這兩錐面用一般數控機床加工必須經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,而國內傳統(tǒng)電磁閥只能應用于低壓工作范圍。

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

費斯托FESTO電磁閥密封力的設計 

     在電磁閥設計中,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計強度,延長彈簧的使用壽命。

費斯托FESTO電磁閥常用產品型號如下：

電磁閥MDH-5/2-D-1-FRC電磁閥MDH-5/2-D-1-FRC雙電控電磁閥JMDH-5/2-D-1C雙電控電磁閥JMDH-5/2-D-1C電磁閥MDH-5/3G-D-1C電磁閥MDH-5/3G-D-1C電磁閥MDH-5/3E-D-1C電磁閥MDH-5/3E-D-1C電磁閥MDH-5/2-D-3-FRC電磁閥MDH-5/2-D-3-FRC雙電控電磁閥JMDH-5/2-D-3C雙電控電磁閥JMDH-5/2-D-3C電磁閥MDH-5/3G-D-3C電磁閥MDH-5/3G-D-3C電磁閥MDH-5/3E-D-3C電磁閥MDH-5/3E-D-3C氣控閥VL-5/2-D-1-FRC雙氣控閥J-5/2-D-1C氣控閥VL-5/3G-D-1C氣控閥VL-5/3E-D-1C電磁閥MDH-5/2-D-1C電磁閥MDH-5/2-D-1C電磁閥MDH-5/2-D-1C雙電控電磁閥JMDH-5/2-D-1C雙電控電磁閥JMDH-5/2-D-1C雙電控電磁閥JMDH-5/2-D-1C氣控閥VL-5/2-D-2-FRC雙氣控閥J-5/2-D-2C氣控閥VL-5/3G-D-2C氣控閥VL-5/3E-D-2C電磁閥MDH-5/2-D-2C電磁閥MDH-5/2-D-2C電磁閥MDH-5/2-D-2C雙電控電磁閥JMDH-5/2-D-2C雙電控電磁閥JMDH-5/2-D-2C雙電控電磁閥JMDH-5/2-D-2C氣控閥VL-5/2-D-3-FRC雙氣控閥J-5/2-D-3C氣控閥VL-5/3G-D-3C氣控閥VL-5/3E-D-3C電磁閥MDH-5/2-D-3C電磁閥MDH-5/2-D-3C電磁閥MDH-5/2-D-3C雙電控電磁閥JMDH-5/2-D-3C雙電控電磁閥JMDH-5/2-D-3C雙電控電磁閥JMDH-5/2-D-3C雙氣控閥JD-5/2-D-1C氣控閥VL-5/3G-D-1C氣控閥VL-5/3E-D-1C氣控閥VL-5/3B-D-1C電磁閥LMD-5/2-D-1C電磁閥LMD-5/3G-D-1C電磁閥LMD-5/3E-D-1-C電磁閥LMD-5/3B-D-1C雙氣控閥JD-5/2-D-3C氣控閥VL-5/3G-D-3C氣控閥VL-5/3E-D-3C氣控閥VL-5/3B-D-3C電磁閥LMD-5/2-D-3C電磁閥LMD-5/3G-D-3C電磁閥LMD-5/3E-D-3-C電磁閥LMD-5/3B-D-3C電磁閥MD-5/2-D-1C電磁閥MD-5/2-D-1C雙電控電磁閥JMDD-5/2-D-1C雙電控電磁閥JMDD-5/2-D-1C電磁閥MD-5/3G-D-1C電磁閥MD-5/3G-D-1C電磁閥MD-5/3E-D-1C電磁閥MD-5/3E-D-1C電磁閥MD-5/3B-D-1C電磁閥MD-5/3B-D-1C電磁閥MD-5/2-D-3C電磁閥MD-5/2-D-3C雙電控電磁閥JMDD-5/2-D-3C雙電控電磁閥JMDD-5/2-D-3C電磁閥MD-5/3G-D-3C電磁閥MD-5/3G-D-3C電磁閥MD-5/3E-D-3C電磁閥MD-5/3E-D-3C電磁閥MD-5/3B-D-3C電磁閥MD-5/3B-D-3C氣控閥VLH-5/2-D-1-FRC雙氣控閥JH-5/2-D-1C氣控閥VLH-5/3G-D-1C氣控閥VLH-5/3E-D-1C氣控閥VLH-5/3B-D-1C氣控閥VLH-5/2-D-3-FRC雙氣控閥JH-5/2-D-3C氣控閥VLH-5/3G-D-3C氣控閥VLH-5/3E-D-3C氣控閥VLH-5/3B-D-3C電磁閥MDH-5/2-D-1-FR-SC雙電控電磁閥JMDH-5/2-D-1-SC電磁閥MDH-5/3B-D-1-SC電磁閥MDH-5/3E-D-1-SC電磁閥MDH-5/3G-D-1-SC電磁閥MDH-5/2-D-3-FR-SC雙電控電磁閥JMDH-5/2-D-3-SC電磁閥MDH-5/3B-D-3-SC電磁閥MDH-5/3E-D-3-SC電磁閥MDH-5/3G-D-3-SC電磁閥MDH-5/3G-D-1C電磁閥MDH-5/3G-D-1C電磁閥MDH-5/3G-D-1C電磁閥MDH-5/3E-D-1C電磁閥MDH-5/3E-D-1C電磁閥MDH-5/3E-D-1C電磁閥MDH-5/3G-D-2C電磁閥MDH-5/3G-D-2C電磁閥MDH-5/3G-D-2C電磁閥MDH-5/3E-D-2C電磁閥MDH-5/3E-D-2C電磁閥MDH-5/3E-D-2C電磁閥MDH-5/3G-D-3C電磁閥MDH-5/3G-D-3C電磁閥MDH-5/3G-D-3C電磁閥MDH-5/3E-D-3C電磁閥MDH-5/3E-D-3C電磁閥MDH-5/3E-D-3C