High-pressure multistage pump
AssigneeEbara Corporation
InventorShinichirou Kameda
Life of this patent
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Abstract
A high-pressure multistage pump is used for supplying liquid to facilities such as boilers under a high discharge pressure. The high-pressure multistage pump has a barrel-shaped outer casing, an inner casing housed in the barrel-shaped outer casing, a cover sealingly closing an axial end of the outer casing, a pump shaft rotatably supported in the inner casing and the cover, and an array of impellers mounted on the pump shaft. One of the impellers has a suction chamber positioned most closely to the cover and held in communication with an inner space which is jointly defined by the outer casing, the inner casing and the cover.
Claims4
A high-pressure multistage pump comprising:
- a barrel-shaped outer casing having an outlet port;
- an inner casing housed in said barrel-shaped outer casing;
- a cover closing an axial end of said outer casing;
- a pump shaft rotatably supported in said inner casing and said cover;
- and
- an array of impellers mounted on said pump shaft, one of said impellers having a suction chamber positioned in said inner casing most closely to said cover;
- wherein said outer casing, said inner casing and said cover jointly define an inner space in communication with said suction chamber, and said outer casing and said inner casing define an outer space in communication with said outlet port, and a pressure developed in said inner space is about half a pressure developed in said outer space when said multistage pump is in high-pressure operation, and a lip gasket is interposed between said outer casing and said inner casing to form a seal between said outer space and said inner space for preventing high pressure flow from said outer casing into said inner casing.
Dependencies are inferred from the claim text.