| 摘要 |
PUMP ROTOR IN PUMP ROTORS (20 AND 30) USED IN AN INTERNAL GEAR PUMP (10), WHICH INCLUDES AN INNER PUMP ROTOR (20) HAVING 5 OUTER GEAR TEETH (21); AN OUTER PUMP ROTOR (30) HAVING INNER GEAR TEETH (31) THAT ENGAGE THE OUTER GEAR TEETH (21); AND A CASING (50) HAVING A PUMPING-IN PORT (51), THROUGH WHICH A FLUID IS PUMPED IN, AND A PUMPING-OUT PORT (52), THROUGH WHICH THE FLUID IS PUMPED OUT, AND PUMPS IN AND PUMPS OUT 10 THE FLUID BY CHANGING THE CELL (C) VOLUME FORMED BETWEEN GEAR TOOTH SURFACES OF THE ROTORS (20 AND 30) SO AS TO CARRY THE FLUID WHEN THE ROTORS (20 AND 30) ENGAGE AND ROTATE, THE ROTORS ARE FORMED WITH A SINTERED FE-CU-C ALLOY AND HAVE A DENSITY IN THE RANGE OF 6.6 TO 7.1 G/CM', AND THE OUTER 15 CIRCUMFERENTIAL SURFACE (30B) OF THE OUTER PUMP ROTOR AND THE END SURFACES PERPENDICULAR TO ROTATING AXES OF THE ROTORS (20 AND 30) ARE NOT GRINDED AND HAVE A 10-POINT AVERAGE ROUGHNESS RZ IN THE RANGE OF 4 TO 10 @TM.
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