Full-circumferential flow pump

A full-circumferential-flow double-suction pump comprising:

• an outer cylinder;
• a motor housed in said outer cylinder, said motor having a motor frame, a stator disposed in said motor frame, a main shaft, a rotor mounted on said main shaft and rotatably disposed in said stator, said outer cylinder defining an annular space defined around said motor frame, said outer cylinder having a suction port defined therein for introducing a fluid therethrough into said annular space and a pair of discharge windows defined therein for discharging a fluid therethrough;
• a pair of pump units mounted on respective opposite ends of said main shaft for pumping a fluid, said pump unit having an impeller;
• and
• a discharge case mounted on an outer circumferential surface of said outer cylinder and having a discharge port for discharging a pumped fluid therethrough and through said discharge windows.

A full-circumferential flow pump comprising:

• an outer cylinder;
• a motor housed in said outer cylinder, said motor having a motor frame, a stator disposed in said motor frame, a main shaft, a rotor mounted on said main shaft and rotatably disposed in said stator, said outer cylinder defining an annular space defining a flow passage around said motor frame, said outer cylinder having a pump suction port defined therein for introducing a fluid therethrough into said annular space;
• a pump unit having an impeller mounted on an end of said main shaft;
• and
• a discharging port communicating with said pump unit independent of said annular space.

A full-circumferential flow double-suction pump comprising:

• an outer cylinder;
• a motor housed in said outer cylinder, said motor having a motor frame, a stator disposed in said motor frame, a main shaft, a rotor mounted on said main shaft and rotatably disposed in said stator, said outer cylinder defining an annular space defined around said motor frame, said outer cylinder having a pump suction port defined therein for introducing a fluid therethrough into said annular space;
• a pair of pump units mounted on respective opposite ends of said main shaft, each of said pump units having an impeller;
• and
• a discharging port communicating with said pump units independent of said annular space.

A submersible double-suction pump comprising:

• an outer cylinder;
• a motor housed in said outer cylinder, said motor having a motor frame, a stator disposed in said motor frame, a main shaft, a rotor mounted on said main shaft and rotatably disposed in said stator, said outer cylinder defining an annular space defined around said motor frame, said outer cylinder having a plurality of suction openings defined therein for introducing a fluid therethrough into said annular space;
• a pair of pump units mounted on respective opposite ends of said main shaft, each of said pump units having an impeller;
• and
• a discharging port communicating with said pump units independent of said annular space.