Pump casing made of sheet metal

A full-circumferential flow pump having a pump casing encasing a canned motor driving an impeller for pumping a fluid with a circumferential passage separating said pump casing and an outer circumferential surface of said motor, said pump casing comprising:

• an outer casing made of sheet metal;
• an inner casing housed in said outer casing for accommodating the impeller therein;
• and
• a guide device provided in said inner casing and having a plurality of radial fluid passages and a plurality of axial fluid passages extending axially from said radial fluid passages for guiding fluid discharged from said impeller toward said circumferential passage.

A full-circumferential flow pump having a pump casing encasing a motor driving an impeller for pumping a fluid with a circumferential passage separating said pump casing and an outer circumferential surface of said motor, said pump casing comprising:

• an outer casing made of sheet metal;
• an outer cylinder connected to said outer casing and accommodating said motor therein, said outer cylinder being made of sheet metal and supporting said motor;
• an inner casing housed in said outer casing for accommodating the impeller therein;
• and
• a guide device provided in said inner casing and having a plurality of radial fluid passages and a plurality of axial fluid passages extending axially from said radial fluid passages for guiding fluid discharged from said impeller toward said circumferential passage.

A pump casing made of sheet metal, comprising:

• an outer casing made of sheet metal;
• an inner casing housed in said outer casing and spaced therefrom for accommodating an impeller in said pump casing, said inner casing having a portion made of sheet metal;
• and
• a resilient material disposed between said outer casing and said inner casing and separating said outer casing and said inner casing such that said outer casing and said inner casing are not in contact with one another.

A full-circumferential flow pump having a pump casing encasing a motor driving an impeller for pumping a fluid with a circumferential passage separating said pump casing and an outer circumferential surface of said motor, said pump casing comprising:

• a suction-side casing made of sheet metal;
• an inner casing housed in said suction-side casing for accommodating said impeller in said pump casing;
• and
• a resilient material in said pump casing separating said outer casing and said inner casing such that said outer casing and said inner casing are not in contact with one another.