| 摘要 |
A gas friction pump including a housing (1) having a suction opening (2) and a gas outlet opening (3), rotor (12) and stator (14) components arranged in the housing (1) for delivery of gases and for obtaining a pressure ratio; and an additional, at least one-stage, concave pump unit (20, 30, 40) provided at a side of the suction opening (2) and having a gas delivery structure, with the additional pump unit (20, 30, 40) being so formed that gas delivery takes place in a radial direction, and with rotor components (21, 31, 41) of the additional pump unit (20, 30, 40) being supported on the same rotor shaft (4) as the rotor components of the pump itself.
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