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柱塞泵是往復ba家的一種,屬于體積泵du,其柱辜靠泵軸的偏心轉動驅動,往復運動zh,其吸入和排出閥都是單向da閥。當柱塞外拉時,工作室內壓力降低,出口閥關閉,低于進口壓力時,進口閥打開,液體進入;柱塞內推時,工作拿壓力升高,進口閥關閉,高于出口壓力時,出口閥打開,液體排出。當傳動軸帶動缸體旋轉時,斜盤將柱塞從缸體中拉出或準回,完成吸排油過程。柱塞與缸孔組成的工作容腔中的油液通過配油盤分別與泵的吸、排油腔相通。變量機構用來改變斜盤的傾角,通過調節斜盤的傾角可改變泵的排量。進油過程
當凸輪的凸起部分轉過去后,在彈簧力的作用下,柱塞向下運動,柱塞上部空間(稱為泵油室)產生真空度,當柱塞上端直把柱塞套上的進油孔打開后,充滿在油泵上體油道內的柴油經油孔進入泵油室,柱塞運動到下止點,進油結束。供油過程,
當凸輪軸轉到凸輪的凸起部分頂起滾輪體時,柱塞彈簧被壓縮,柱塞向上運動,燃油受壓,一部分燃法經油孔流回噴油泵上體油腔。當柱嘉頂面遮住套筒上進油孔的上緣時,由于柱審和套筒的配合間陳很小(0.0015.0.0025mm)使柱塞頂部陽8家油拿成為一個密封由腔,柱奉繼續上升,家油室內的油壓迅速升高,泵油壓力>出油閱彈簧力+高壓油管剩余壓力時,推開出油閥,高壓柴油經出油閥進入高壓油管,通過噴油器噴入燃燒室。回油過程
柱塞向上供油,當上行到柱塞上的斜槽(停供邊)與套筒上的回油孔相通時,家油室低壓油路便與柱塞頭部的中孔和徑向孔及斜槽溝通,油壓驟然下降,出由閥在彈簧力的作用下迅速關閉,停止供油。此后柱蠢還要上行,當凸輪的凸起部分轉過去后,在彈黃的作用下,柱塞又下行。此時便開始了下一個循環。注塞泵以一個柱塞為原理介紹,一個柱塞泉上有兩個單向閥,并且方向相反,柱塞向一個方向運動時缸內出現負壓,這時一個單向閥打開液體被吸入缸內柱塞向另一個方向運動時,將液體壓縮后另一個單向閥被打開,被吸入缸內的液體被排出。這種工作方式連續運動后就形成了連續供油,
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