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US 8,939,719 B2Granted
Centrifugal pump with outlet flow passage of increasing cross-section
AssigneeJohnson Electric S.A.
InventorsYing Juan Wan, Long Hing Tang
Life of this patent
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Abstract
A centrifugal pump includes a motor having an output shaft, a volute mounted at one side of the motor and an impeller which is located inside the volute and attached to the output shaft. The volute has an inlet arranged along the axial direction, an oulet arranged along the lateral direction and a flow channel arranged along the circumferential direction. The flow channel has a spiral shape. The cross-sectional area of the flow channel increases towards the outlet.
Claims13
A centrifugal pump, comprising:
- a motor having a shaft;
- an impeller attached to the shaft of the motor;
- and
- a monolithic volute comprising:
- a chamber enclosing the impeller;
- an inlet along an axial direction of the shaft of the motor and communicating with the chamber;
- a spiral flow channel communicating with the chamber and having a spiral inner wall with a decreasing radius of curvature between a first end and a second end along a flow direction;
- an outlet passage having a first end coupled to the second end of the spiral flow channel and a second end;
- and
- an outlet connected to the second end of the outlet passage,
- wherein the outlet passage has an inner wail and an outer wall both being inclined with respect to a center line of the outlet, an outlet inner spreading angle formed between the inner wall of the outlet passage and the center line of the outlet being less than an outlet outer spreading angle formed between the outer wall of the outlet passage and the center line of the outlet.
8 more elements
Dependencies are inferred from the claim text.