Full-circumferential flow pump

A full-circumferential flow double-suction pump comprising:

• a motor having a stator, a rotor mounted on a shaft and disposed in said stator for rotation relative to said stator and an outer frame casing enclosing said stator;
• an outer cylinder disposed around said outer frame casing with an annular space defined therebetween, said outer cylinder having a discharge port defined therein in communication with said annular space;
• a pair of pump assemblies mounted on respective opposite ends of said shaft for pumping a fluid into said annular space;
• a pair of cylindrical cup-shaped pump casings connected to respective opposite ends of said outer cylinder for housing respective pump assemblies, said cylindrical cup-shaped pump casings having respective suction nozzles;
• a header pipe for connecting said suction nozzles to each other and having a suction port defined therein for introducing a fluid therethrough and through said suction nozzles into said pump assemblies;
• and
• a partition wall disposed in said cylindrical cup-shaped pump casing and dividing the interior space of said cylindrical pump casing into a suction pressure side communicating with said suction nozzle and a discharge pressure side communicating with said annular space.