초록 ▼

A pump having an improved fluid passage has an inner casing which houses at least one impeller and an outer casing which houses the inner casing. The pump also has a communicating pipe disposed outside of the outer casing for guiding a main flow of a fluid being handled from a space defined in the o

A pump having an improved fluid passage has an inner casing which houses at least one impeller and an outer casing which houses the inner casing. The pump also has a communicating pipe disposed outside of the outer casing for guiding a main flow of a fluid being handled from a space defined in the outer casing into another space defined in the outer casing.

대표청구항 ▼

[ What is claimed is:] [1.] A multistage pump comprising:an outer casing;a plurality of impellers housed in said outer casing and having respective suction mouths, said impellers including at least one impeller whose suction mouth is open in a direction opposite to the direction in which the suction

[ What is claimed is:] [1.] A multistage pump comprising:an outer casing;a plurality of impellers housed in said outer casing and having respective suction mouths, said impellers including at least one impeller whose suction mouth is open in a direction opposite to the direction in which the suction mouth of another impeller is open, for thereby reducing an axial thrust force developed by said impellers; andtwo single volutes associated respectively with said at least one impeller whose suction mouths are open in the opposite directions, respectively, said single volutes having respective ends where they start or stop winding, which are positioned substantially 180.degree. spaced from each other for thereby canceling out radial loads developed by said impellers.