DG multistage centrifugal pump structure and application

 DG multistage centrifugal pump is more efficient and can meet the needs of high-lift and high-flow conditions. It has been widely used in petrochemical, chemical, electric power, construction and fire protection industries. Multistage centrifugal pump shaft is also equipped with a series of two also on the impeller, it is relative to the general single-stage centrifugal pump, but also to achieve a higher head; relative to the piston pump, diaphragm pump reciprocating pump, but also Pump larger flow. Due to its particularity, multi-stage centrifugal pumps have different and higher technical requirements in terms of design, use, maintenance and repair compared with single-stage centrifugal pumps. Often overlooked or neglected by people in some details, frequent failures such as abnormal wear, vibration, and axle holding after multistage centrifugal pumps are put into use also cause the machine to stop.
The structure of multistage centrifugal pump is composed of pump, magnetic actuator and electric motor.
A, multistage centrifugal pump in medium or medium flow rate is small: dry friction bearings, burning bearings. Multistage centrifugal pumps are lubricated and cooled by the conveying medium to the plain bearings, which are damaged by the absence of lubrication and cooling of the conveying medium without opening the inlet or outlet valves.
b, multi-stage centrifugal pump damage to the isolation sleeve: multi-stage centrifugal pump magnetic coupling pump is transported by the media cooling, if there are hard particles in the media, it is easy to cause the isolation sleeve scratched or scratched, and sometimes if Improper maintenance methods may also cause damage to the isolation sleeve.
C, DG multi-stage centrifugal pump in the operating conditions caused by fluctuations in the problem: multi-stage centrifugal pump axial force is automatically balanced by hydraulic equilibrium. In actual operation, if the operating parameters fluctuate greatly, it is easy to undermine the multistage centrifugal pump hydraulic balance, so that the bearing to bear the large radial and axial force and bearing damage.
D, multi-stage centrifugal pump caused by cavitation problems: pump cavitation causes mainly pump inlet tube resistance, the media more gas, filling pump is not enough, the pump inlet can not enough and other reasons. Cavitation is the most damaging to the pump. In case of cavitation, the pump vibrates violently and the hydraulic balance will be severely damaged, which will damage the pump bearing, rotor or impeller. This is a common cause of multi-stage centrifugal pump failure.
Multistage centrifugal pump installation in addition to meet the general installation of technical requirements, but also should note the following:
1, When the combination of motor and pump is installed, the axial end of pump coupling should be drawn out axially and the gap value of 2-3mm end should be left to ensure the axial clearance between pump and motor coupling.
Note: Make sure the floor leveling, equipment level after a good degree of grouting
CAUTION: For the installation to be successful, the coupling adjustment must be correct and the flexible coupling can not compensate for any significant misalignment. Misalignment can cause rapid wear, noise, vibration, and damage to the equipment. Therefore, the coupling must be adjusted within the limits given.
Caution: Measures must be taken to support the pump inlet and outlet pipes to prevent excessive pump load.
2, multi-stage centrifugal pump and motor shaft center line should be in the same horizontal line.
3, the pump can only withstand its own internal forces, can not afford any external force.
China haina pump brand dg multistage centrifugal pump advanced hydraulic model, high efficiency, wide range of performance, smooth operation, low noise, sealed with a soft packing seal or mechanical seal, seal safe and reliable, simple structure, easy maintenance. Multi-stage centrifugal pump shaft seal structure to ensure that no contact with the media, no corrosion, long service life. Multi-stage centrifugal pump for the transport of water and physical and chemical properties similar to the liquid water, the maximum temperature of the liquid can not be 80 ℃, multi-stage centrifugal pump for industrial and urban water supply and drainage, high-rise building pressurized water supply, garden sprinkler irrigation, fire increased Pressure, long-distance water supply, heating, heating and cooling water bath and other facilities and equipment, etc., especially for small boiler feed water.