Multi-stage centrifugal pump
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Why is the outlet of this multi-stage centrifugal pump located in the middle of the pump body?
If the outlet is in the middle, how does the impeller at the rear end function?
Just use a transition channel to guide the water there
It is indeed used to balance axial forces
A method of balancing axial forces by arranging impellers back to back
Arranged back to back to balance axial forces
There is also a pipe at the bottom of the pump, and that’s why the outlet is in the middle.
The impellers on both sides are installed back to back, that is, in opposite directions. There are flow channels on the outside of the impeller at the motor end, which allow the medium to flow from the last impeller at the front end to the inlet of the first impeller at the motor end, thereby achieving a balance of axial forces. Generally, the medium transported by such pumps is relatively pure; otherwise, if the flow channels in the impeller at the motor end become blocked, the axial force will no longer be constant, and the entire main shaft, impeller, as well as the shaft sleeves will wear out more rapidly.
This is a method used by pumps to eliminate axial forces; the impellers are arranged symmetrically. In multi-stage pumps, the impellers are divided into two sections, and you will understand the arrangement direction of these two sections if you take a close look. A portion of the liquid from the first stage enters the inlet of the second stage. This centrifugal compressor will also use this method to eliminate axial force.