Patent ID: 8262339

Claim:
A flow channel structure of a regenerative pump, comprising: an impeller flow channel of an impeller, said impeller comprising a plurality of radial vanes on both sides at an outer diameter thereof, a radial flow channel defined between each adjacent vane, a shroud plate, an axial curve on a vane root at a leading edge of the impeller to form an axial inlet, a hub plate to support the radial vanes at both sides of the impeller, and a trailing edge at an outlet of the impeller flow channel; a pump casing flow channel inside a pump casing, said pump casing comprising a top wall, a side wall and a bottom wall, wherein a cross section of said pump casing flow channel is defined by an interior of the top wall, the side wall, the bottom wall, wherein a maximum width section of said pump casing flow channel is adjacent to the leading edge, said top wall being adjacent to the trailing edge, wherein an inner diameter of the top wall is greater than an outer diameter of the trailing edge, the top wall and the side wall forming an obtuse angle, and the side wall extending slantingly to the maximum width section and said side wall being connected with the bottom wall, the bottom wall turning to the leading edge while passing the maximum width section, wherein the bottom wall and the axial curve on the vane root form a smooth connection and form a smooth inlet at the leading edge.