| 主权项 |
1. A pump comprising:
a pump casing; a pump chamber formed in the pump casing; an impeller disposed within the pump chamber, the impeller having a plurality of vanes forming an inlet and an outlet; a sealing plate, forming one side of the pump chamber; a motor for driving the impeller; wherein the pump casing is a monolithic object comprising: a main body having a first surface, a recess in the first surface, a suction port, a suction channel, a suction passage, a discharge port, and a discharge channel, wherein the recess forms a first opening in the first surface, the first opening is closed by the sealing pump to form the pump chamber, the recess having a second opening in a second surface opposite the first surface and a wall connecting the first surface to the second surface; the suction passage communicates with the recess via the second opening and is aligned with the inlet of the impeller; the suction port is connected to the suction passage by the suction channel; the discharge port is connected to the recess by the discharge channel which extends from a third opening formed in the wall of the recess; the diameter of wall of the recess remains the same or decreases along a direction from the first surface to the second surface; the diameter of the inner surface of the suction passage remains the same or decreases along a direction away from the recess; the inner diameter of the suction channel remains the same or decreases along a direction towards the suction passage; and the inner diameter of the discharge channel remains the same or decreases along a direction towards the recess. |
