| 摘要 |
<p>A portable, rotary vane vacuum pump (3) with a rotor (13) eccentrically mounted within the bore of a housing (7) to substantially abut the bore at a side location (43). The abutting, side location (43) is between the inlet (31) and outlet (33) passages of the bore in the direction of rotor rotation (21). A pocket (P) is then created just above the contact area (43) between the rotor (13) and bore which collects and maintains a pool of lubricating oil. The pool enhances the seal at the contact area (43) below it enabling the pump (3) to draw a deep vacuum with just a single stage. The portable pump (1) also includes a removable, oil reservoir cartridge (4) mounted to the main body of the pump (1). Other features include a visual indicator (20) in the cartridge (4) to monitor the condition of the circulating oil, a step up gearing arrangement (54) for the cooling fan (50), and a step down gearing arrangement (58) for the vane pump (3).</p> |
