Manufacturing method of 3-dimensional plastic impeller of centrifugal pump and the impeller

A die-formed 3-dimensional plastic impeller of a centrifugal pump, characterized in that, the 3-dimensional plastic impeller comprises:

• a shroud, a hub, and a plurality of blades, together form flow channel in the impeller for working fluid, the shroud and the hub are configured to restrict a flow path of the working fluid, the hub is configured to transmit torque to the blades, each of the blades has a 3-dimensional twisted shape configured to improve pump efficiency, characterized in that:
• each of the blades comprises a front portion, a rear portion connected to the front portion, a shroud line connected to the shroud, and a hub line connected to the hub, wherein the shroud line comprises a first shroud line and a second shroud line, the hub line comprises a first hub line and a second hub line, the first shroud line and the first hub line are located on the front portion, the second shroud line and the second hub line are located on the rear portion, and the first shroud line and the first hub line are different in blade angle;
• the hub comprises a hub rim part and an inner hub, the hub rim part has a hub hole, and the hub rim part has a power transmission seat configured to transmit torque to the blades;
• the shroud comprises a shroud rim part and an inner shroud, the shroud rim part has a shroud hole;
• the front portion of each of the blades is located between the hub hole of the hub rim part and the shroud hole of the shroud rim part;
• the rear portions of the blades and the hub rim part are formed in a single piece at the same molding process, and the rear portions of the blades are connected to the shroud rim part;
• and
• the inner shroud and the inner hub are respectively installed in the shroud hole and the hub hole so as to be combined with the front portions of the blades.

An impeller of centrifugal pump, characterized in that, the impeller comprises:

• a hub comprising a hub rim part and an inner hub, wherein the hub rim part has a hub hole;
• and
• a plurality of blades being arranged along the hub rim part, wherein the blades each have a twisted blade portion located at the hub hole of the hub rim part and formed above a central portion;
• wherein the hub rim part and the blades are formed in a single piece at the same molding process, the twisted blade portions and the hub rim part do not overlap with each other, and the hub hole of the hub rim part and the inner hub are disposed by heat welding or melting rods, thereby together forming the impeller.