Oil field pump

Abstract

An oil field pump is installed within a pipe that connects to an oil field, and feeds accumulated extraction oil in a predetermined direction, the oil field pump including a rotor formed with an internal flow path for the extraction oil, a stator mounted on the outer circumference of the rotor, a thrust bearing that supports the axial weight of the rotor and the stator, and a supply pipe that supplies a portion of the extraction oil from the center side in the rotational direction of the flow path to the thrust bearing.

1 . An oil field pump installed within a pipe that connects to an oil field, the oil filed pump being configured to feed accumulated extraction oil in a predetermined direction, the oil field pump comprising:
 a rotor formed with a flow path for the extraction oil therein;   a stator mounted on an outer circumference of the rotor;   a thrust bearing that supports an axial weight of the rotor and the stator; and   a supply pipe that supplies a portion of extraction oil from a center side in a rotational direction of the flow path to the thrust bearing.   
     
     
         2 . The oil field pump according to  claim 1 , wherein
 the thrust bearing includes a protrusion part fixed to the outer circumference of the rotor and rotating as one piece with the rotor, and a facing part fixed to the stator and facing opposite a surface in an axial direction of the protrusion part, and   the extraction oil is filled between the protrusion part and the facing part.   
     
     
         3 . The oil field pump according to  claim 1 , wherein a portion of the supply pipe protrudes into the flow path. 
     
     
         4 . The oil field pump according to  claim 3 , wherein an end of the supply pipe on the flow path side is installed along the flow direction of the extraction oil on the flow path. 
     
     
         5 . The oil field pump according to  claim 1 , wherein the supply pipe is open on an end surface on an inner side of the flow path in a radial direction. 
     
     
         6 . The oil field pump according to  claim 5 , further comprising a discharge pipe that discharges the extraction oil supplied to the thrust bearing to further downstream than a connector of the supply pipe of the flow path.