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                                                                                                                                電動執行器和閥門的連接方式

                                                                                                                                * 來源: http://www.javnevesti.com * 作者: YLOK進口閥門 * 發表時間: 2019-08-15 13:32:23 * 瀏覽: 2036

                                                                                                                                電動執行器多與閥門配套,應用于自動化控制系統。電動執行器的種類很多,在動作方式上各有不同,如角行程電動執行器是輸出轉角力矩,而直行程電動執行器是輸出位移推力。電動執行器在系統應用時的種類,應根據閥門的工作需要進行挑選。

                                                                                                                                電動執行器和閥門連接方式

                                                                                                                                ??一、法蘭連接:

                                                                                                                                ??這是閥門中用得最多的連接形式。按結合面形狀又可分為以下幾種:

                                                                                                                                ??1、光滑式:用于壓力不高的閥門。加工比較方便

                                                                                                                                ??2、凹凸式:工作壓力較高,可使用中硬墊圈

                                                                                                                                ??3、榫槽式:可用塑性變形較大的墊圈,在腐蝕性介質中使用較廣泛,密封效果較好。

                                                                                                                                ??4、梯形槽式:用橢圓形金屬環作墊圈,使用于工作壓力≥64公斤/平方厘米的閥門,或高溫閥門。

                                                                                                                                ??5、透鏡式:墊圈是透鏡形狀,用金屬制作。用于工作壓力≥100公斤/平方厘米的高壓閥門,或高溫閥門。

                                                                                                                                ??6、O形圈式:這是一種較新的法蘭連接形式,它是隨著各種橡膠O形圈的出現,而發展起來的,它在密封效連接形式。

                                                                                                                                ??二、螺紋連接:

                                                                                                                                ??這是一種簡便的連接方法,常用于小閥門。又分兩種情況:

                                                                                                                                ??1、直接密封:內外螺紋直接起密封作用。為了確保連接處不漏,往往用鉛油、線麻和聚四氟乙烯生料帶填充;其中聚四氟乙烯生料帶,使用日見廣泛;這種材料耐腐蝕性能很好,密封效果極佳,使用和保存方便,拆卸時,可以完整地將其取下,因為它是一層無粘性的薄膜,比鉛油、線麻優越得多。

                                                                                                                                ??2、間接密封:螺紋旋緊的力量,傳遞給兩平面間的墊圈,讓墊圈起密封作用。

                                                                                                                                ??三、卡套連接:

                                                                                                                                ??卡套連接,它的連接和密封原理是,當旋緊螺母時,卡套受到壓力,使其刃部咬入管子外壁,卡套外錐面又在壓力下與接頭體內錐面密合,因而能夠可靠地防止泄漏。

                                                                                                                                ??這種連接形式的優點是:

                                                                                                                                ??1、體積小,重量輕,結構簡單,拆裝容易;

                                                                                                                                ??2、連接力強,使用范圍廣,可耐高壓(1000公斤/平方厘米)、高溫(650℃)和沖擊振動

                                                                                                                                ??3、可以選用多種材料,適合防腐蝕;

                                                                                                                                ??4、加工精度要求不高;便于高空安裝。

                                                                                                                                ??卡套連接形式,已在中國某些小口徑閥門產品中采用。

                                                                                                                                ??四、卡箍連接:

                                                                                                                                ??這是一種快速連接方法,它只需兩個螺栓,適用于經常拆卸的低壓閥門。

                                                                                                                                ??五、內自緊連接:

                                                                                                                                ??以上各種連接形式,都是利用外力來抵消介質壓力,實現密封的。下面介紹利用介質壓力進行自緊的連接形式。它的密封圈裝在內錐體處,跟介質相向的一面成一定角度,介質壓力傳給內錐體,又傳遞給密封圈,在一定角度的錐面上,產生兩個分力,一個與閥體中心線平行向外,另一個壓向閥體內壁。后面這個分力便是自緊力。介質壓力愈大,自緊力也愈大。所以這種連接形式,適合于高壓閥門。它比法蘭連接,要節省許多材料和人力,但也需要一定的預緊力,以便在閥內壓力不高時,使用可靠。利用自緊密封原理做成的閥門,一般是高壓閥門。

                                                                                                                                ??閥門連接的形式還很多,例如有的不必拆除的小閥門,跟管子焊接在一起;有的非金屬閥門,采用承插式連接,等等。閥門使用者要根據具休情況具體對待。

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