| 主权项 |
1. A portable, rotating vane vacuum pump with an automatic vacuum breaking arrangement, said portable, rotating vane vacuum pump including:
a housing having an inner surface with at least a portion thereof extending about a first axis and defining in part a bore, a rotor mounted within said bore for rotation about a second axis offset from and substantially parallel to said first axis, said rotor further including at least two vanes mounted for sliding movement within respective slots in said rotor, a motor to selectively rotate said rotor in a first rotational direction about said second axis within said bore, said vanes having inner and outer edge portions with the outer edge portions being in contact with the inner surface of said housing including said bore as said rotor is rotated by said motor about said second axis within said bore separating said bore into a plurality of chambers with at least one of said chambers being at a pressure less than ambient pressure, said housing further including at least one inlet passage and at least one outlet passage through said inner surface in respective fluid communication with said bore, a lubricating oil system having an oil inlet arrangement and an oil return arrangement, said oil inlet arrangement including a first primary oil reservoir container and a secondary oil reservoir container, said oil inlet arrangement supplying oil from said first primary oil reservoir container to the bore of said housing into said at least one chamber while the motor is rotating said rotor and said first primary and secondary oil reservoir containers are open to atmosphere and at ambient pressure, said one chamber being at said pressure less than ambient pressure and said oil being drawn into said one chamber via a first flow path upstream of said bore in said housing and downstream of said first primary oil reservoir container while said motor is rotating said rotor and said first primary and secondary oil reservoir containers are open to atmosphere and at ambient pressure, said first flow path being in fluid communication with said secondary oil reservoir container as well as with the bore of said housing, said oil return arrangement delivering oil via a second path from the bore of the housing and said secondary oil reservoir container back to said first primary oil reservoir container with said first primary and secondary oil reservoir containers open to atmosphere and at ambient pressure, and an automatic vacuum breaking arrangement to vent the bore of the housing to atmosphere from the secondary oil reservoir container via said first flow path without going through said first primary oil reservoir container upon the motor ceasing to rotate the rotor, said automatic vacuum breaking arrangement including said secondary oil reservoir container open to atmosphere and said first flow path in fluid communication with said secondary oil reservoir container and with the bore of said housing, said portable, rotating vane vacuum pump further including at least one valve member between the outlet passage of the housing and the secondary oil reservoir container, said valve member being biased to a closed position upon the motor ceasing to rotate the rotor wherein said first flow path is in fluid communication with said secondary oil reservoir container and with the bore of said housing without going through said valve member in said closed position wherein ambient air enters the bore of said housing via the secondary oil reservoir container and said first flow path without going through said valve member and said first primary oil reservoir container upon the motor ceasing to rotate the rotor. |
