氦質譜檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)儀(yi)(yi)檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)原理(li)及方(fang)(fang)式(shi)(shi)：氦質譜檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)儀(yi)(yi)的(de)檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)方(fang)(fang)式(shi)(shi)，氦質譜檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)儀(yi)(yi)的(de)檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)方(fang)(fang)式(shi)(shi)通常有兩種，一(yi)種為常規(gui)檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)，另一(yi)種為逆(ni)(ni)擴(kuo)(kuo)散(san)(san)(san)檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)。逆(ni)(ni)擴(kuo)(kuo)散(san)(san)(san)檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)是(shi)把被檢(jian)(jian)(jian)(jian)(jian)件接在(zai)分子(zi)泵(beng)出氣(qi)(qi)口一(yi)端，防水(shui)測試供應商(shang)，漏(lou)(lou)入的(de)氦氣(qi)(qi)由(you)分子(zi)泵(beng)出氣(qi)(qi)口逆(ni)(ni)著泵(beng)的(de)排氣(qi)(qi)方(fang)(fang)向進(jin)入安裝在(zai)泵(beng)的(de)進(jin)氣(qi)(qi)口端的(de)質譜管內(nei)(nei)而(er)被檢(jian)(jian)(jian)(jian)(jian)測。這(zhe)一(yi)檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)方(fang)(fang)式(shi)(shi)是(shi)基于分子(zi)泵(beng)對(dui)不(bu)(bu)(bu)同(tong)質量的(de)氣(qi)(qi)體具有不(bu)(bu)(bu)同(tong)壓縮比(bi)(氣(qi)(qi)體在(zai)分子(zi)泵(beng)出氣(qi)(qi)口壓強與進(jin)氣(qi)(qi)口壓強之(zhi)比(bi))即利(li)用不(bu)(bu)(bu)同(tong)氣(qi)(qi)體的(de)逆(ni)(ni)擴(kuo)(kuo)散(san)(san)(san)程度不(bu)(bu)(bu)同(tong)程度而(er)設計的(de)。逆(ni)(ni)擴(kuo)(kuo)散(san)(san)(san)原理(li)：逆(ni)(ni)擴(kuo)(kuo)散(san)(san)(san)方(fang)(fang)式(shi)(shi)檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)允(yun)許(xu)被檢(jian)(jian)(jian)(jian)(jian)件內(nei)(nei)壓強較高，氦質譜檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)儀(yi)(yi)可達300Pa(一(yi)般常規(gui)檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)儀(yi)(yi)為0.05Pa以下(xia))，適(shi)合檢(jian)(jian)(jian)(jian)(jian)大型容器或(huo)有大漏(lou)(lou)的(de)器件，也(ye)適(shi)合吸檢(jian)(jian)(jian)(jian)(jian)漏(lou)(lou)。逆(ni)(ni)擴(kuo)(kuo)散(san)(san)(san)方(fang)(fang)式(shi)(shi)還具有質譜管不(bu)(bu)(bu)易受污染，燈絲(si)壽(shou)命長等優點。

氣密性(xing)測試(shi)設備的發展展望

氣密(mi)性(xing)測(ce)(ce)試設(she)備的檢測(ce)(ce)精(jing)(jing)度(du)或靈敏度(du)與(yu)儀器(qi)里面(mian)用到(dao)的壓(ya)力傳(chuan)(chuan)(chuan)(chuan)送器(qi)有(you)(you)(you)很大關(guan)(guan)(guan)系，具體(ti)來說(shuo)與(yu)壓(ya)力傳(chuan)(chuan)(chuan)(chuan)送器(qi)分(fen)辨率誤(wu)差(cha)有(you)(you)(you)關(guan)(guan)(guan)，比如目(mu)前壓(ya)力傳(chuan)(chuan)(chuan)(chuan)送器(qi)分(fen)辨率誤(wu)差(cha)有(you)(you)(you)0.01-5%，誤(wu)差(cha)越小，檢測(ce)(ce)精(jing)(jing)度(du)越高，同時與(yu)傳(chuan)(chuan)(chuan)(chuan)感謝(xie)器(qi)的量程(cheng)有(you)(you)(you)關(guan)(guan)(guan)，防水測(ce)(ce)試，比如量程(cheng)越小，精(jing)(jing)度(du)則越高。同時與(yu)不同品牌PLC處理(li)器(qi)能力有(you)(you)(you)關(guan)(guan)(guan)，因為(wei)(wei)主要數字處理(li)能力還是(shi)靠PLC的，壓(ya)力傳(chuan)(chuan)(chuan)(chuan)送器(qi)負(fu)責(ze)把氣壓(ya)模擬量給到(dao)PLC，PLC再把模擬量轉(zhuan)化為(wei)(wei)數字。理(li)論上差(cha)壓(ya)檢測(ce)(ce)精(jing)(jing)度(du)可達到(dao)1-5PA，而直壓(ya)的檢測(ce)(ce)精(jing)(jing)度(du)為(wei)(wei)5PA以上，有(you)(you)(you)些廠家宣稱精(jing)(jing)度(du)達到(dao)0.1PA，那只是(shi)在軟件上做手腳(jiao)，實際上是(shi)達不到(dao)如此精(jing)(jing)度(du)。

怎樣檢(jian)測氣缸(gang)的氣密(mi)(mi)性？第(di)l一(yi)，發動機預熱至75～85℃的正常工作溫度(du)；第(di)二(er)，利用(yong)壓(ya)(ya)縮(suo)空氣把火(huo)花(hua)(hua)塞(sai)孔(kong)上(shang)的灰塵吹凈，然后把所有火(huo)花(hua)(hua)塞(sai)都擰(ning)下(xia)，把充(chong)氣嘴(zui)裝上(shang)；第(di)三，防(fang)水測試哪里好，在(zai)儀器(qi)出口完全(quan)密(mi)(mi)封的情況下(xia)，讓(rang)儀器(qi)接上(shang)氣源(yuan)，進(jin)氣壓(ya)(ya)力可通(tong)過調壓(ya)(ya)閥調節，滿足(zu)(zu)測量表指(zhi)針指(zhi)向刻度(du)0.4MPa的要求；第(di)四，活塞(sai)位(wei)(wei)置(zhi)指(zhi)示器(qi)在(zai)分電器(qi)蓋卸下(xia)以后進(jin)行安裝，第(di)l一(yi)缸(gang)跳火(huo)位(wei)(wei)置(zhi)應(ying)該對(dui)著分火(huo)頭，防(fang)水測試報價，此時，一(yi)缸(gang)進(jin)排(pai)氣門均處于關閉位(wei)(wei)置(zhi)，一(yi)缸(gang)活塞(sai)達到上(shang)止點(dian)，然后進(jin)行定位(wei)(wei)盤的轉動，滿足(zu)(zu)刻度(du)1對(dui)準分火(huo)頭尖l端的要求；