UNIAXIALLY ECCENTRIC SCREW PUMP ROTOR

摘要

Provided is an uniaxially eccentric screw pump (10) comprising a male screw type rotor (14). This male screw type rotor (14) includes a rotor base member made of an iron-group material, an intermediate layer formed on the surface of the rotor base member and having a higher heat conductivity than that of the rotor base material, and a male screw type rotor (14) formed on the surface of the intermediate layer and having a surface layer made of a DLC film. When the uniaxially eccentric screw pump (10) is driven, the slurry moves toward an exit (22) while being filled in a cavity portion (38) formed between the male screw type rotor (14) and a female screw type stator (12). Even if the temperature near the exit then rises with the increase in the face pressure, it diffuses from the exit side to the entrance side through the intermediate layer of the high heat conductivity of the male screw type rotor (14) so that it is homogenized. Therefore, a transfer liquid can be fed at a substantially constant temperature. Since the male screw type rotor (14) has the DLC film on the outermost surface, moreover, it is hardly influenced by the wear even if it transfers the slurry of a high wearing property.