Vacuum pump with rotor-stator positioning to provide non-return

摘要

A rotary-vane vacuum pump comprises a stator and a vaned rotor, the stator partly defining an outlet chamber and including an outlet passage opening to the outlet chamber. The rotor is rotatably sealed to the stator; it has a sealing area to block the outlet passage, and, an unsealing area alignable with the outlet passage by rotation of the rotor to periodically unblock the outlet passage. The disclosed pump offers reduced resistance to lubricant oil discharge from the outlet passage, which results in lower differential pressure between inlet and outlet chambers at the end of the pumping cycle.

主权项

1. A rotary-vane vacuum pump comprising:
a stator with an outlet passage, the stator partly defining an outlet chamber; and a vaned rotor rotatably sealed to the stator, the rotor having a sealing area to block the outlet passage, the sealing area contiguous with a bearing area of the stator, and an unsealing area alignable with the outlet passage by rotation of the rotor to periodically unblock the outlet passage, the unsealing area formed as a notch in the sealing area.