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 cylindrical pump casing disposed around said outer frame casing with an annular space defined therebetween, said outer cylindrical pump casing having a pain of suction windows near the respective axial ends and a discharge port defined therein in communication with said annular space between said suction windows;
• a pair of pump assemblies mounted on respective opposite ends of said shaft for pumping a fluid into said annular space;
• and
• a suction case mounted on an outer circumferential surface of said outer cylindrical pump casing having a suction port defined therein for introducing a fluid therethrough and through said suction windows into said pump assemblies.