Patent ID: 8113802
Filing Date: 2012-02-14
Classification: F04D,Y10T

Abstract:
1. A food centrifugal pump formed by stamping and welding, comprising: a pump casing having an annular inclined wall and formed from a single metal plate by stamping; an inlet pipe and an outlet pipe connected with the pump casing; a cover mounted inside of the pump casing; a bracket for supporting the inlet pipe and provided on an outer side of the pump casing, wherein one end of said bracket is connected to the pump casing and the other end is engaged over and fixed onto the inlet pipe; an impeller; a shaft; and a motor provided external to the casing; wherein said impeller is mounted on the shaft and is driven to rotate by the motor, the impeller having a half-open type structure comprising blades, a hub, and a back plate upon which the blades are connected; wherein a front portion of said blades is located proximate to an inner side of the annular inclined wall so as to form an end face seal between the inclined wall and the blades; and wherein each blade is formed from a single metal piece so as to possess a U-shaped cross section defining a yoke and a pair of spaced-apart legs, the yoke being secured to the back plate and the legs extending perpendicular to the yoke so as to form an open channel, wherein the legs extend radially outward along circular arc paths from an interior portion of the back plate towards an outer circumference of the back plate, the spacing between the pair of legs on each blade being greatest near the outer circumference; and wherein an outer portion of each leg is located proximate to the annular inclined wall and slopes obliquely at an angle α, which angle is equal to an obliquity angle β of the annular inclined wall so as to form the end face seal.