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噴油加工的原理

塑膠模具加工廠在兒童平板電腦外殼進行噴油加工的時候,會采取環保型噴油加工,那么噴油加工的原理是什么呢?

噴(pen)(pen)(pen)油(you)(you)(you)中將燃(ran)油(you)(you)(you)霧化(hua),并分布在燃(ran)燒(shao)室內與空(kong)氣混合(he)的(de)(de)部件。它主要(yao)(yao)由噴(pen)(pen)(pen)油(you)(you)(you)嘴(zui)和(he)噴(pen)(pen)(pen)油(you)(you)(you)器體組成(cheng)。它在缸蓋(gai)上(shang)的(de)(de)安裝位置與角度取決于燃(ran)燒(shao)室的(de)(de)設計。噴(pen)(pen)(pen)油(you)(you)(you)器的(de)(de)噴(pen)(pen)(pen)霧特(te)性包括霧化(hua)粒度、油(you)(you)(you)霧分布、油(you)(you)(you)束方向、射程和(he)擴散錐角等。這(zhe)些特(te)性應符合(he)柴(chai)油(you)(you)(you)機燃(ran)燒(shao)系(xi)統(tong)的(de)(de)要(yao)(yao)求(qiu),以使混合(he)氣形成(cheng)和(he)燃(ran)燒(shao)完善(shan),并獲得較高的(de)(de)功率和(he)熱(re)效率。噴(pen)(pen)(pen)油(you)(you)(you)器分為開式和(he)閉式兩(liang)種(zhong)。開式噴(pen)(pen)(pen)油(you)(you)(you)器結(jie)構簡單,但霧化(hua)不良(liang),很(hen)少被(bei)采用。閉式噴(pen)(pen)(pen)油(you)(you)(you)器廣泛應用在各(ge)種(zhong)柴(chai)油(you)(you)(you)機上(shang)。

噴(pen)(pen)(pen)(pen)油(you)(you)嘴由針(zhen)(zhen)閥(fa)(fa)(fa)和針(zhen)(zhen)閥(fa)(fa)(fa)體這一對精(jing)密偶件組(zu)成。調(diao)(diao)壓(ya)彈(dan)(dan)簧(huang)將針(zhen)(zhen)閥(fa)(fa)(fa)緊(jin)壓(ya)在(zai)針(zhen)(zhen)閥(fa)(fa)(fa)體上,使(shi)之(zhi)呈(cheng)關閉狀態(tai)。當噴(pen)(pen)(pen)(pen)油(you)(you)泵(beng)開始壓(ya)油(you)(you),油(you)(you)路內產生高壓(ya)波(bo),并以聲(sheng)速(su)由噴(pen)(pen)(pen)(pen)油(you)(you)泵(beng)端向噴(pen)(pen)(pen)(pen)油(you)(you)嘴端傳播(bo)。油(you)(you)壓(ya)作用到(dao)針(zhen)(zhen)閥(fa)(fa)(fa)的上錐面(mian)上,克服彈(dan)(dan)簧(huang)力(li)使(shi)針(zhen)(zhen)閥(fa)(fa)(fa)升起,從而使(shi)燃油(you)(you)流進壓(ya)力(li)室經噴(pen)(pen)(pen)(pen)孔噴(pen)(pen)(pen)(pen)出。油(you)(you)泵(beng)一旦停止供油(you)(you),油(you)(you)壓(ya)下(xia)降,在(zai)彈(dan)(dan)簧(huang)力(li)作用下(xia)針(zhen)(zhen)閥(fa)(fa)(fa)當即關閉。調(diao)(diao)整彈(dan)(dan)簧(huang)的松緊(jin)可以改(gai)變噴(pen)(pen)(pen)(pen)油(you)(you)器開啟壓(ya)力(li)。

一般塑膠模具加工廠采用的(de)噴(pen)(pen)(pen)(pen)(pen)(pen)油(you)(you)器(qi)按(an)頭部形狀分(fen)(fen)為(wei)孔(kong)式(shi)、軸(zhou)(zhou)針(zhen)(zhen)式(shi)和(he)節流(liu)式(shi)。4孔(kong)以下的(de)噴(pen)(pen)(pen)(pen)(pen)(pen)油(you)(you)器(qi)用于半開式(shi)燃(ran)燒室(shi)(見柴油(you)(you)機);孔(kong)數更(geng)多(duo)的(de)噴(pen)(pen)(pen)(pen)(pen)(pen)油(you)(you)器(qi)大多(duo)用于開式(shi)燃(ran)燒室(shi)。這種噴(pen)(pen)(pen)(pen)(pen)(pen)油(you)(you)器(qi)每孔(kong)可噴(pen)(pen)(pen)(pen)(pen)(pen)出(chu)錐角不大、射程較長的(de)油(you)(you)束。孔(kong)數、孔(kong)徑和(he)孔(kong)壁厚度對噴(pen)(pen)(pen)(pen)(pen)(pen)霧(wu)特性有(you)影響,依柴油(you)(you)機機型而定。軸(zhou)(zhou)針(zhen)(zhen)式(shi)噴(pen)(pen)(pen)(pen)(pen)(pen)油(you)(you)器(qi)用于渦流(liu)室(shi)、預燃(ran)室(shi)等(deng)分(fen)(fen)隔式(shi)燃(ran)燒室(shi)和(he)復合式(shi)燃(ran)燒室(shi)中(zhong)。針(zhen)(zhen)閥頭部的(de)軸(zhou)(zhou)針(zhen)(zhen)穿過噴(pen)(pen)(pen)(pen)(pen)(pen)孔(kong),形成環形噴(pen)(pen)(pen)(pen)(pen)(pen)射通路,能使(shi)噴(pen)(pen)(pen)(pen)(pen)(pen)出(chu)的(de)油(you)(you)霧(wu)呈空心(xin)錐狀。節流(liu)式(shi)與軸(zhou)(zhou)針(zhen)(zhen)式(shi)類(lei)似(si),只是靠改(gai)變軸(zhou)(zhou)針(zhen)(zhen)形狀使(shi)針(zhen)(zhen)閥上(shang)升(sheng)時形成節流(liu),借以改(gai)變噴(pen)(pen)(pen)(pen)(pen)(pen)油(you)(you)規(gui)律,使(shi)柴油(you)(you)機工作柔和(he)。

兒童平板電腦外殼(ke)在噴油(you)(you)(you)加(jia)工(gong)的(de)時候(hou)噴油(you)(you)(you)器嘴(zui)端與(yu)燃氣(qi)接觸(chu),溫度很高(gao)(gao)。強化的(de)柴油(you)(you)(you)機(ji)常用長型(xing)噴油(you)(you)(you)嘴(zui),使針閥與(yu)針閥體(ti)的(de)精密配(pei)合部分距燃燒(shao)室遠些(xie),以免這對偶件受熱(re)膨脹變形,發生卡滯。大型(xing)高(gao)(gao)強化柴油(you)(you)(you)機(ji)采用冷卻式噴油(you)(you)(you)嘴(zui)。另有一種鉛筆式噴油(you)(you)(you)器,尺(chi)寸較(jiao)小,既便于在缸(gang)蓋上布置,又(you)與(yu)燃氣(qi)接觸(chu)少,適用于小型(xing)高(gao)(gao)速柴油(you)(you)(you)機(ji)。