Impeller of multiblade blower and method of manufacuturing the same

A method of manufacturing an impeller of a multiblade blower having circular support plates that are made of a resin and rotate about an axis of rotation and a plurality of blades that are made of a resin and are disposed on outer peripheral portions of the circular support plates so as to be parallel to the axis of rotation, with each blade having a plurality of cutouts formed in a blade tip to form a serrated shape the method comprising:

• forming a cavity configured to receive a resin, the cavity being formed by providing axial-direction-removable molds and radial-direction removable molds, the axial-direction removable molds being configured to form portions of blade faces of the blades excluding blade face portions extending to positions a predetermined distance from the blade tips having serrated shapes, the radial-direction-removable molds being disposed to face the axial-direction-removable molds in a direction intersecting the axis-of-rotation direction and which are configured to form the blade face portions of the blade faces of the blades to the positions the predetermined distance from the blade tips having the serrated shapes;
• injecting the resin inside the cavity;
• and
• removing the radial-direction-removable molds in the direction intersecting the axis-of-rotation direction with respect to the axial-direction-removable molds after the resin has solidified inside the cavity.

A method of manufacturing an impeller of a multiblade blower having circular support plates that are made of a resin and rotate about an axis of rotation and a plurality of blades that are made of a resin and are disposed on outer peripheral portions of the circular support plates so as to be parallel to the axis of rotation, with each blade having a plurality of cutouts formed in a blade tip to form a serrated shape the method comprising:

• forming a cavity configured to receive a resin, the cavity being formed by providing axial-direction-removable molds and a circumferential-direction-removable mold, the axial-direction removable molds being configured to form portions of blade faces of the blades excluding blade face portions extending to positions a predetermined distance from the blade tips having serrated shapes, the circumferential-direction-removable mold being disposed so as to be relatively rotatable with respect to the axial-direction-removable molds and which is configured to form the blade face portions of the blade faces of the blades to the positions the predetermined distance from the blade tips having the serrated shapes;
• injecting the resin inside the cavity;
• and
• rotating and removing the circumferential-direction-removable mold about the axis of rotation with respect to the axial-direction-removable molds after the resin has solidified inside the cavity.