The operating principle of the circulation pump is based on the use of centrifugal force. The impeller with radially bent blades is mounted on the motor shaft. Water from the suction pipe enters the center of the rotating impeller and, under the action of inertia forces (centrifugal force), is thrown along the blades to its periphery.
On the outlet side of the impeller, water enters the spiral channel in the form of a diffuser, where the kinetic energy transferred to the water from the impeller is converted into potential energy, increasing its static pressure.
In wet rotor circulation pumps, the motor rotor rotates directly in the pumped water, which simultaneously performs the function of cooling and lubricating the radial thrust sliding bearings.
Centrifugal pumps have a rigid dependence of performance parameters on the rotational speed and diameter of the impeller:
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