Overview of multi-stage pump balance drum
When the multi-stage pump is running, the axial force generated due to the difference in the area of the front and rear cover plates of the impeller is directed towards the suction end. For a multi-stage pump, the axial force is the sum of the axial forces generated by each impeller. The axial force passes through The hydraulic balance device balances the axial force.
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The working principle of the balance drum of the multistage centrifugal pump
The multi-stage pump balancing device includes a balancing drum that rotates with the shaft and a balancing drum sleeve that is fixed on the outlet section. The balance drum is the pressure generated at the back cover of the last stage impeller (approximately equal to the outlet pressure of the multi-stage pump) " a " and the pressure generated by the balance chamber (equal to the inlet pressure + the loss of the balance line) " b ' ' caused by the balance drum The pressure difference "F" above is used to balance the axial force. The pressure difference "F" is generated by the end face "A" of the balance drum. The balance drum of each specification of the multistage centrifugal pump can ensure that the multistage pump can completely balance the axial force at the operating point. The thrust bearing balances the residual axial force. Due to the pressure difference between the "a" cavity and the "b" cavity, the medium passes through the gap "c" between the balance drum and the balance drum sleeve, and flows into the "b" balance device for trouble-free operation. In order to balance the axial force, the pressure in the balance cavity is prevented from being too high by the control of the balance flow.
Multistage centrifugal pump balance pipeline
If the configuration of the balance pipeline is not treated strictly, the multistage pump may cause serious damage.
In order to prevent the pressure of the balance chamber from being too high, the flow rate of the discharge liquid must be controlled. (The location is marked on the dimension drawing). The planning of the balance pipeline is based on the form of operating conditions:
For example:
Lead back to the tank at the inlet end and lead back to the suction chamber or suction line of the multistage pump
For details, see the installation drawing provided with the multistage pump.
If it is led back to the tank at the inlet end, the following items must be noted:
Select the appropriate nominal diameter so that the friction loss of the balance line does not exceed 0.8 bar.
For maintenance, valves should be installed on the pipeline, and the valves should be provided with locking devices to prevent unauthorized or accidental closing.
