MD coal mine drainage with multistage pump balance device

MD coal mine drainage in the role of the multistage pump balance device:

MD coal mine drainage in multistage axial thrust pump impeller exist, only rely on the force pump axial thrust bearing is difficult to completely, under axial force balance device must be installed. The reasons of the axial thrust is mainly effect on the sides of impeller imbalance caused by the fluid pressure. Coal mine drainage with multistage pump is generally configuration is balancing the structure of the balance disc device by balance disc, balance and adjust the set of ( Some balance disc and adjust as one) , improve the service life of the pump, the features of reasonable structure, smooth operation, the axial force balance, long service life of bearing, extend working hours of water pump, etc.

the work principle of balance disc device is: out of the last stage impeller with the pressure of liquid, the balance bridge and adjust the suite of the radial clearance into the balance disc and balance between the water chamber, make water chamber on high-pressure condition. Balance disc after the equalizer pipe connected to the entrance of the pump, the pressure approximation for multistage pump inlet pressure. Such pressure are not equal on both sides of balance disc, creates the balance of axial force of back. The size of the balance of axial force along the axial displacement of the change, adjust the balance disc and balance between the axial clearance ( The change of balance disc and balance between water chamber pressure) , so as to achieve the purpose of the balance. But this balance is often a dynamic balance. MD coal mine drainage with multistage pump axial force balancing device, a pump body, pump axle and impeller, its characteristic lies in multistage pump shaft position is equipped with the balance disc and balance disc, balance disc wall connected to the water pump shaft is fixed, the outer wall and balance disc activities connected with one end connected to the impeller, the balance disc holder and pump body after a period of fixed connection, the balance of balance disc seat and disc between formation fluid clearance, when the fluid through the balance disc holder and fluid space between the balance disc, because the balance disc and relative motion between balance disc seat, make water ring formed between fluid clearance, reach the role of dynamic seal, resulting in a decline in fluid pressure and balance of dish of inferior vena pressure is greater than the cavity pressure, will generate most of the axial force of impeller is balanced. MD coal mine drainage with multistage pump operation, the axial force generated when the impeller is greater than the balance of the axial force on the plate, pump shaft to the pump inlet direction, make the balance between the plate and the balance ring gap decreases, and then by high pressure liquid friction increases, the clearance leakage is reduced, the balance between the plate and the balance ring pressure rise, increased the balance on the balance disc, until the balance force and axial force is equal. Axial clearance remain the same. Conversely when the axial force is less than the balance force, pump shaft to the right, clearance increases, high pressure liquid leakage, the balance disc and balance ring, the pressure drop between the role in the balance on the balance disc is reduced, until to generate axial force on the impeller is equal, keep running under axial clearance in a certain gap.

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