| 摘要 |
Proposed is a vane-type pump (1) having - a housing (3), - a rotor (5) which can be driven in rotation, - which rotor has a number of slots (9), - which slots each receive a displaceable vane (17), wherein - delivery cells (19, 21) of variable volume are formed between successive vanes (17), having - a pump chamber (23) which accommodates the rotor (5) with the vanes (17), which pump chamber (23) has side surfaces (25) laterally adjoining the rotor (5) and the vanes (17) and has a stroke contour (27) which is arranged between the side surfaces (25) and against which the outer ends of the vanes (17) bear during the operation of the vane-type pump (1), and - having openings (29, 31) which are provided in the side surfaces (25) and of which at least one serves for the charging of the delivery cells (19, 21) and of which at least one serves for the discharge of a pressurized medium that is delivered by the delivery cells, wherein - the medium comprises water, alcohols such as ethanol, ammonia or other organic liquids or a mixture of the stated substances and furthermore a lubricant, the specific weight and/or viscosity of which is greater than that of the other constituents of the medium. The vane-type pump is characterized in that - an outer edge (39, 41), facing toward the stroke contour (27), of the openings (29, 31) is arranged at a distance (x) from the stroke contour (27). |
