Abstract: A new assembly for a capacitor-run submersible motor-pump. The assembly has a built-in starting capacitor and a built-in switch associated with the starting capacitor. A running capacitor is located external to the assembly. With this arrangement, the assembly has only four terminals including a ground terminal connected to the frame of the motor. Thus, a four-conductor cable, i.e. the most commonly used cable, can be used to connect the assembly to an electric distribution panel. The switch is preferably of a centrifugal type triggered at a predetermined speed of the motor to cut the starting capacitor out of the circuit. The assembly is as compact as a conventional capacitor-start motor assembly.

Abstract: A submergible pump comprising a motor section, a pump section comprising a pump casing and a pump impeller mounted on the distal end of a motor shaft in the motor section, and a support serving also as a strainer. The motor section, the pump casing, and the support are easily assembled and disassembled by plural bolts the heads of which are retained unmovably in bushings disposed circumferentially in the support.

Abstract: A strainer for use in a submergible pump is constructed by a plurality of stoppers arranged on a plate member and each of the stoppers is disposed and extended in the direction of liquid flow passing from the peripheral portion of the plate member towards the central portion of the same or the suctioning opening of the pump. Each of the members is provided with a slanted edge near the center portion, an upright edge near the outer periphery and a tip edge parallel to the plate member and coupling the slanted edge. The upright edge and the height of the tip edge is made shorter in its axial length so that the liquid flow may freely pass between the adjacent stoppers as well as the portion between the tip edge and the pump body.The stoppers or entire strainer may be made of elastic material to give flexibility to the stoppers so as to make the flow passage larger by the deflection thereof to allow smooth backward flow and give facility for cleaning when the pump is de-energized.