What is the plate at the inlet of the pump for?

There’s a newly opened pump inlet; I don’t know what it’s for, I’ve never seen it before

The swirl plate at the pump inlet, also known as an anti-vortex plate, is a small component used to break up vortices~~

Stabilizing plate, which allows the liquid to flow axially and prevents pre-rotation

This post was last edited by 3983596_FPPZ on 2018-9-22 08:03 to prevent liquid rotation at the inlet. Liquid rotation at this point is also known as inlet pre-rotation, and it can lead to: 1) a rotational velocity that results in reduced inlet pressure, thereby increasing the risk of cavitation in the pump; 2) a decrease in the pump’s head. This can be seen from the theoretical formula for head (entering the formula is complicated, so please refer to relevant literature). To prevent pre-rotation, a baffle with a structure no smaller than the radius is required to block the pre-rotation of the liquid caused by the rotation of the impeller or the pipeline. This is a common design for the straight-cone inlet of pumps with higher flow rates; it can also be found in the inlets of other types of pump housings, such as the semi-spiral suction chamber of AY pumps. This baffle is not welded to the pump body but is cast directly as part of it.

As a supplementary note, I just thought of this: if this partition is located very close to the impeller nut, it can also prevent the impeller nut from falling off, even when the pump is not running in reverse

To prevent rotation of the liquid at the inlet, this phenomenon of liquid rotation at the inlet is also known as inlet pre-rotation; such a design can be seen here. This plate is not welded to the pump body but is instead cast directly.