Improvements in pneumatic vane pumps with intermittent lubrication and operation.

摘要

An intermittently operating pump has a cylindrical seat for the rotor constituted by a ring (4) of porous sintered material housed in a container (8). The lubricating oil is collected in the interspace (15) between the ring and the container when the pump is operating and returns to the pump when the pump is stopped, to keep the ring of the seat impregnated.