4WRZ16E150-7X/6EG24N9K4/V力士樂(lè)比例閥

4WRZ16E150-7X/6EG24N9K4/V

電磁比例換向閥（帶反饋） 4WRE(E)...2X...
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4WRZ16E150-7X/6EG24N9K4/V

1、用于靜密封時(shí)的密封原理

在靜密封中以O(shè)形圈應(yīng)用為廣泛。如果設(shè)計(jì)、使用正確，O形密封圈在靜密封中可以實(shí)現(xiàn)無(wú)泄漏的密封。

O形密封圈裝入密封槽后，其截面承受接觸壓縮應(yīng)力而產(chǎn)生彈性變形。

對(duì)接觸面產(chǎn)生一定的初始接觸壓力Po。即使沒(méi)有介質(zhì)壓力或者壓力很小，O形密封圈靠自身的彈性力作用而也能實(shí)現(xiàn)密封;當(dāng)容腔內(nèi)充入有壓力的介質(zhì)后，在介質(zhì)壓力的作用下，O形密封圈發(fā)生位移，移向低壓側(cè)，同時(shí)其彈性變形進(jìn)一步加大，填充和封閉間隙δ。此時(shí)，坐用于密封副偶合面的接觸壓力上升為Pm:

Pm=Po+Pp

式中Pp——經(jīng)O形圈傳給接觸面的接觸壓力(0.1MPa)

Pp=K*P

K——壓力傳遞系數(shù)，對(duì)于橡膠制O形密封圈K=1;

P——被密封液體的壓力(0.1MPa)。

從而大大增加了密封效果。由于一般K≥1，所以Pm>P。由此可見(jiàn)，只要O形密封圈存在初始?jí)毫?，就能?shí)現(xiàn)無(wú)泄漏的密封。這種靠介質(zhì)本身壓力來(lái)改變O形密封圈接觸狀態(tài)，使之實(shí)現(xiàn)密封的性質(zhì)，稱為自封作用。
力士樂(lè) 比例閥 武漢現(xiàn)貨
理論上，壓縮變形即使為零，在油壓力下也能密封，但實(shí)際上O形密封圈安裝時(shí)可能會(huì)有偏心。所以，O形圈裝入密封溝槽后，其斷面一般受到7%—30%的壓縮變形。靜密封取較大的壓縮率值，動(dòng)密封取較小的壓縮率值。這是因?yàn)楹铣上鹉z在低溫下要壓縮，所以靜密封O形圈的預(yù)壓縮量應(yīng)考慮補(bǔ)償它的低溫收縮量。

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