backing pump
美 [ˈbækɪŋ pʌmp]英 [ˈbækɪŋ pʌmp]
- 备用泵;初级真空（抽气）泵, 旋转油泵
backing pump-
In the multistation exhaust system a mechanic pump is used as the backing pump and molecular pump as the main integral part to form a high vacuum system .
由机械泵为前级泵，分子泵为主抽泵构成高真空系统，对高压开关管进行真空排气；
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The outlet pressure of all those pumps were not lower than 0.1 Torr , and it follows that those pumps can run well by using directly the mechanical vacuum pumps as backing pumps without booster pump used .
所有这些泵的最大出口压力不低于0.1Torr，因此前级泵可直接用机械真空泵，不必用增压泵即能正常工作。
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