平昌機械密封件輔(fu)助密(mi)封(feng)(feng)的(de)作用是(shi)防止動(dong)環(huan)和靜環(huan)與壓(ya)蓋之間的(de)泄漏;補(bu)償密(mi)封(feng)(feng)面(mian)的(de)偏斜和振動(dong)，以保證密(mi)封(feng)(feng)面(mian)良好(hao)的(de)貼合(he)(he)。這(zhe)就要求輔(fu)助密(mi)封(feng)(feng)的(de)材料具有一定的(de)彈(dan)性(xing)。因(yin)此，首(shou)選材料應是(shi)合(he)(he)成橡(xiang)膠等(deng)。

　　為有效(xiao)地密(mi)封(feng)(feng)(feng)(feng)，必須利用(yong)(yong)(yong)(yong)彈(dan)性(xing)元件使密(mi)封(feng)(feng)(feng)(feng)面(mian)保持接觸，因(yin)此，其中(zhong)一個輔助(zhu)密(mi)封(feng)(feng)(feng)(feng)能產生軸向位(wei)移，以(yi)保持其密(mi)封(feng)(feng)(feng)(feng)性(xing)能(當采用(yong)(yong)(yong)(yong)波紋管密(mi)封(feng)(feng)(feng)(feng)時，由于它可(ke)以(yi)作軸向移動(dong)而無須可(ke)動(dong)的輔助(zhu)密(mi)封(feng)(feng)(feng)(feng)件)。輔助(zhu)密(mi)封(feng)(feng)(feng)(feng)件有多(duo)種形狀，如(ru)平墊(dian)、O型(xing)(xing)(xing)圈(quan)、V型(xing)(xing)(xing)圈(quan)、U型(xing)(xing)(xing)圈(quan)等，后兩種主要(yao)適用(yong)(yong)(yong)(yong)于滑(hua)動(dong)件密(mi)封(feng)(feng)(feng)(feng)，O型(xing)(xing)(xing)圈(quan)既可(ke)用(yong)(yong)(yong)(yong)于滑(hua)動(dong)密(mi)封(feng)(feng)(feng)(feng)也可(ke)用(yong)(yong)(yong)(yong)于靜(jing)密(mi)封(feng)(feng)(feng)(feng)，平墊(dian)只可(ke)用(yong)(yong)(yong)(yong)于靜(jing)密(mi)封(feng)(feng)(feng)(feng)。

　　常用(yong)輔(fu)助密封材料的(de)使用(yong)溫(wen)度范圍和應用(yong)場合(he)列在表1中(zhong)。