Dry running rotary vacuum pump - has pair of sliding vanes inside central bearing sleeve

摘要

The vacuum pump in which the two sliding vanes (1, 2) serve as drives within a central sleeve (3). The sleeve is made as the inner ring of a needle roller bearing (14). A spring (15) ensures that the driven vane (1) is always pressed into the peripheral recess (16). The use of an encapsulated bearing prevents oil from penetrating the pump chamber (9). ADVANTAGE - Gives a good final vacuum, has a long operating life, and produces minimal noise.