Fluid pump impeller including blades extending from a hub to an outer ring and having a draft angle between adjacent blades that varies between the hub and the outer ring

A fluid pump comprising:

• a housing;
• an electric motor within said housing, said electric motor having a shaft which rotates when electricity is applied to said electric motor;
• an impeller located between an inlet plate having an inlet plate flow channel facing toward said impeller and an outlet plate having an outlet plate flow channel facing toward said impeller, wherein said impeller comprises:
• a hub rotationally coupled to said shaft such that said shaft provides rotational motion in a rotational direction about an axis, said hub having an outer surface;
• an outer ring which is concentric with said hub, said outer ring having an inner surface;
• and
• a plurality of blades extending from a root at said outer surface of said hub to a tip at said inner surface of said outer ring, each one of said plurality of blades having a first leg and a second leg which meet at a vertex, thereby forming a V-shape such that a concave side of said V-shape faces toward said rotational direction and such that a convex side of said V-shape faces away from said rotational direction;
• wherein said first leg, at said concave side of each one of said plurality of blades, forms a draft angle with said first leg at said convex side of another one of said plurality of blades which is immediately adjacent thereto in said rotational direction;
• and
• wherein said draft angle at said inner surface of said outer ring is less than or equal to 10% of said draft angle at said outer surface of said hub.