Submersible pump

Abstract

A submersible pump includes: a single phase motor having a drive shaft extending in the vertical direction; a pump assembly which is driven by the single phase motor; a motor casing in which the single phase motor is contained; an external casing in which the motor casing is inserted to form an annular channel between the external casing and the outer circumferential surface of the motor casing; and a capacitor. The capacitor is arranged on the side of the single phase motor in the motor casing.

1 . A submersible pump comprising:
 a single phase motor having a drive shaft extending in the vertical direction;   a pump assembly which is driven by the single phase motor;   a motor casing in which the single phase motor is contained;   an external casing in which the motor casing is inserted to form an annular channel between the external casing and the outer circumferential surface of the motor casing; and   a capacitor which is arranged on the side of the single phase motor in the motor casing.   
     
     
         2 . The submersible pump of  claim 1 , wherein
 the single phase motor is arranged such that the drive shaft thereof is eccentric to the center of the external casing in a certain direction of eccentricity and   the capacitor is arranged on the side of the single phase motor opposite the certain direction of eccentricity.   
     
     
         3 . The submersible pump of  claim 1  further comprising a motor cover which closes an upper opening end of the motor casing, wherein the motor cover is attached with a bearing for supporting the drive shaft of the single phase motor.