Pump rotation issue
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The pump motors here all rotate counterclockwise, and the same is true for the pumps. Is this related to the design of the impeller, or are there any regulations regarding this?
The rotation direction of the motor is determined by the rotation direction of the pump, which in turn is determined by… It is determined based on the pitch line of the impeller. :lol
The pump’s inlet and outlet are determined as needed, while the impeller and rotation direction are determined by the inlet and outlet
The motor direction is determined by the pump direction, which in turn is determined by the pump’s structure and the type of impeller.
The first floor is correct; check the involute of the impeller
The tangent direction at the outlet of the impeller determines the rotation direction of the pump. The motor can operate in both directions; changing the wiring connections in the junction box allows the direction of the motor to be altered.
The rotation direction of the pump can be determined based on the curved shape of the centrifugal pump impeller blades or the involute shape of the pump volute! Determining the pump’s inlet and outlet positions does not allow for a definite determination of the pump’s rotation direction! For example, in the case of a single-stage, single-suction cantilever centrifugal pump, the inlet is usually horizontal while the outlet points vertically upward. When viewed from the direction of the pump coupling, the pump can be designed to rotate clockwise or counterclockwise; however, once the design is finalized, its rotation direction is fixed, depending on the design of the impeller and the volute (the design of the impeller and the volute must be compatible with each other) ； The same is true for horizontal single-stage double-suction split-case pumps: even if the position of the pump’s drive end is changed and thus the direction of rotation of the pump changes with respect to the motor, the positions of the pump’s inlet and outlet remain unchanged.