旋片真空泵可以(yi)去除(chu)密封(feng)容器(qi)中(zhong)的干燥(zao)氣體(ti),并且如果安裝(zhuang)氣鎮裝(zhuang)置,則(ze)可以(yi)去除(chu)一定量的可冷凝氣體(ti)。但是(shi),它不適合去除(chu)氧氣過高(gao),對金(jin)屬有腐蝕性,對泵(beng)油有化學反應性,并含(han)有微粒粉塵(chen)的氣體(ti)。 旋片真(zhen)空泵(beng)有單(dan)級(ji)和雙(shuang)級(ji)兩種形(xing)式。所謂的兩級(ji)是(shi)將兩個串(chuan)聯的單(dan)級(ji)泵(beng)連接起來。通常,將其(qi)制成兩個階段以(yi)獲(huo)得更高(gao)的真(zhen)空度。
旋片真空泵的抽速與入口壓力(li)之間的關(guan)系如下(xia):在入口壓力(li)為1333 Pa,1.33 Pa和1.33×10 -1(Pa)時,抽速值(zhi)不應小于95泵的標稱泵送速度的百分比,50%和20%。
旋(xuan)片(pian)(pian)真(zhen)空(kong)泵(beng)(beng)主要由泵(beng)(beng)體,轉(zhuan)(zhuan)(zhuan)子(zi),旋(xuan)轉(zhuan)(zhuan)(zhuan)葉片(pian)(pian),端蓋,彈簧等組成。轉(zhuan)(zhuan)(zhuan)子(zi)偏心地安裝在旋(xuan)轉(zhuan)(zhuan)(zhuan)葉片(pian)(pian)泵(beng)(beng)的(de)(de)(de)(de)空(kong)腔(qiang)中,轉(zhuan)(zhuan)(zhuan)子(zi)的(de)(de)(de)(de)外圓周與泵(beng)(beng)室的(de)(de)(de)(de)內表面相切(兩(liang)者之間存在小(xiao)的(de)(de)(de)(de)間隙),并且兩(liang)個轉(zhuan)(zhuan)(zhuan)子(zi)葉片(pian)(pian)安裝在轉(zhuan)(zhuan)(zhuan)子(zi)中插槽。當(dang)旋(xuan)轉(zhuan)(zhuan)(zhuan)時(shi),旋(xuan)轉(zhuan)(zhuan)(zhuan)葉片(pian)(pian)的(de)(de)(de)(de)頂端通過(guo)離心力和彈簧的(de)(de)(de)(de)張力保持與泵(beng)(beng)室的(de)(de)(de)(de)內壁接(jie)觸,并且轉(zhuan)(zhuan)(zhuan)子(zi)的(de)(de)(de)(de)旋(xuan)轉(zhuan)(zhuan)(zhuan)驅動旋(xuan)轉(zhuan)(zhuan)(zhuan)葉片(pian)(pian)沿著內壁滑動。泵(beng)(beng)室。
旋片真空(kong)(kong)泵的(de)旋轉(zhuan)葉片將由(you)轉(zhuan)子(zi)(zi),泵室和(he)(he)兩(liang)個端(duan)蓋(gai)包圍的(de)新月(yue)形空(kong)(kong)間(jian)分成A,B和(he)(he)C三(san)部分。當轉(zhuan)子(zi)(zi)沿箭頭(tou)方向旋轉(zhuan)時,空(kong)(kong)間(jian)與吸(xi)入(ru)口連通體(ti)(ti)積(ji)(ji)逐(zhu)漸(jian)(jian)增加并(bing)(bing)處于吸(xi)入(ru)過(guo)程(cheng)中(zhong)。與排氣(qi)口連通的(de)空(kong)(kong)間(jian)C的(de)容(rong)積(ji)(ji)逐(zhu)漸(jian)(jian)減小,并(bing)(bing)且處于排氣(qi)過(guo)程(cheng)中(zhong)。中(zhong)心空(kong)(kong)間(jian)B的(de)體(ti)(ti)積(ji)(ji)也逐(zhu)漸(jian)(jian)減小并(bing)(bing)且處于壓(ya)縮(suo)過(guo)程(cheng)中(zhong)。由(you)于空(kong)(kong)間(jian)A的(de)容(rong)積(ji)(ji)逐(zhu)漸(jian)(jian)增加(即,膨脹),氣(qi)體(ti)(ti)壓(ya)力降(jiang)低,并(bing)(bing)且泵入(ru)口處的(de)外部氣(qi)體(ti)(ti)壓(ya)力強于空(kong)(kong)間(jian)A中(zhong)的(de)壓(ya)力,從而(er)吸(xi)入(ru)氣(qi)體(ti)(ti)。
當空(kong)間A與吸入(ru)口隔離時(shi),即與空(kong)間B的(de)位置隔開時(shi),氣(qi)(qi)(qi)體(ti)開始被壓(ya)(ya)(ya)縮(suo)(suo)(suo),體(ti)積逐漸減小(xiao),最后與排(pai)氣(qi)(qi)(qi)口連(lian)通(tong)(tong)。當壓(ya)(ya)(ya)縮(suo)(suo)(suo)氣(qi)(qi)(qi)體(ti)超(chao)過(guo)排(pai)氣(qi)(qi)(qi)壓(ya)(ya)(ya)力時(shi),排(pai)氣(qi)(qi)(qi)閥被壓(ya)(ya)(ya)縮(suo)(suo)(suo)氣(qi)(qi)(qi)體(ti)推(tui)開,氣(qi)(qi)(qi)體(ti)通(tong)(tong)過(guo)油箱中的(de)油層排(pai)放到大氣(qi)(qi)(qi)中。泵(beng)(beng)的(de)連(lian)續操(cao)作實(shi)現了連(lian)續泵(beng)(beng)送(song)的(de)目(mu)的(de)。如果(guo)排(pai)出的(de)氣(qi)(qi)(qi)體(ti)通(tong)(tong)過(guo)空(kong)氣(qi)(qi)(qi)通(tong)(tong)道并轉移(yi)到另一個(ge)(ge)階(jie)段(duan)(duan)(低(di)真空(kong)水平),則它被低(di)真空(kong)階(jie)段(duan)(duan)抽走,然后被低(di)真空(kong)階(jie)段(duan)(duan)壓(ya)(ya)(ya)縮(suo)(suo)(suo)并排(pai)放到大氣(qi)(qi)(qi)中,這構成了兩個(ge)(ge)階(jie)段(duan)(duan)泵(beng)(beng)。此時(shi),總(zong)壓(ya)(ya)(ya)縮(suo)(suo)(suo)比由兩個(ge)(ge)階(jie)段(duan)(duan)承擔,從(cong)而增加極限真空(kong)。
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