Dp Type Self-Balancing High-Pressure Centrifugal Water Pump

DP self-balancing multistage centrifugal pump is a basic product in the self-balancing horizontal multistage pump series, which is used to transport clear water without solid particles, the temperature is lower than 80 °C or the liquid with physical and chemical properties similar to clean water, which is widely used in mines, factories and urban water supply and drainage projects, fire water, long-distance water transmission and other fields. 
Head: 70-1790m
Efficiency: 30%-80%
Pump weight: 155-6260kg
Npsh:2.0-7.0m
Motor power: 5.5-4500kw
Flow rate: 3.5-1345m³/h

1. Application range of DP self-balancing high-pressure centrifugal water pump
The self-balancing high-pressure water pump is suitable for conveying clear water without solid particles, the temperature is lower than 80 °C or the liquid with physical and chemical properties similar to clean water, and is widely used in mines, factories and urban water supply and drainage projects, fire water, long-distance water transmission and other fields
2. Description of the structure of DP self-balancing high-pressure centrifugal water pump
The self-balancing high-pressure water pump is supported at both ends, the shell part is segmental, and the transmission mode of the pump is connected with the motor through the pin elastic coupling. Direction of rotation of the pump: From the drive end, the pump rotates in a clockwise direction.
1)    Stator section
Mainly by the suction section (water inlet section), the middle section, the discharge section (water outlet section), the guide vane, the secondary water inlet section, the packing box (tail cover) and the bearing body are connected by tension bolts respectively, from the coupling end, the pump suction inlet is the horizontal right direction, and the discharge outlet is vertical upward.
2)    Rotor section
It is mainly composed of shafts, impellers, throttle shaft components, bearings and bushings.
3)    Pump sealing
3.1 The static joint surface between the suction section (inlet section), middle section, discharge section (outlet section) and secondary inlet section of the pump is sealed with sealant or molybdenum disulfide.
3.2 Throttling seals are used between all levels of the pump.
3.3 The shaft seals on both sides of the pump are sealed with soft packing.
3.4 The water retaining ring is used to block water to prevent water from entering the bearing.
4)    Bearing part
The whole rotor of the self-balancing high-pressure water pump is supported by the cylindrical roller bearing "GB/T283-94" at the driving end, and the angular contact ball bearing "GB/T292-94" is used at the end, and the bearing is lubricated by CD30 or CD40 mechanical oil added to the bearing body to the center of the oil mirror. Because the bearing adopts "GB/T292-94" angular contact ball bearing, the assembled pump rotor has no axial channeling momentum.
3. 10 advantages of self-balancing high-pressure centrifugal water pump VS traditional multistage centrifugal pump
1)    New structure: The self-balancing high-pressure water pump has a rotor component with a symmetrical arrangement of impellers, so that the axial thrust generated by the positive and negative impellers in operation is basically canceled out by each other, eliminating the balance plate device with small gap, high pressure drop, easy to wash, easy to wear and easy to fail, and breaking through the traditional structure of multistage pump;
2)    New technology: the unique throttling and pressure reducing device of the self-balancing high-pressure water pump, and the odd-level balancing device can also play the role of auxiliary support;
3)    High efficiency and energy saving: the self-balancing high-pressure water pump adopts advanced hydraulic model, which solves the wear and axial pulsation brought by the balance plate, so that the alignment of the impeller and the guide vane is always in an excellent state, and in the process of long-term use, it also avoids the obvious decrease in efficiency of the ordinary multistage pump due to the wear of the balance plate and the forward movement of the rotor components, and there is no leakage of balance water, which reduces the volume loss, improves the operation efficiency of the pump as a whole, reduces the shaft power, and is 3%-12% higher than the efficiency of ordinary multistage pumps on average;
4)    High reliability: the self-balancing high-pressure water pump basically cancels the axial force load generated during the operation of the pump through the self-balancing system, the wear and system interference of the rotor to the pump is reduced to very small, and a very small part of the residual axial force is also borne by the thrust bearing, so that the pump shaft is always in a tensile state, the stress state of the shaft is uniform, and the stress peak is greatly reduced compared with the prototype structure, so as to improve the rigidity and critical speed of the pump rotor, and significantly improve the stability and reliability of the pump rotor.
5)    High stability: The self-balancing high-pressure water pump can maintain extremely high stability and operation efficiency after long-term operation through the excellent combination of symmetrical impeller and guide vane, as well as reasonable matching gap and wide axial throttle design;
6)    Good cavitation performance: the self-balancing high-pressure water pump adopts optimized hydraulic model and structural design, special first-stage impeller double-suction structure, coupled with precision casting, and wear-resistant materials, so that the pump has good anti-cavitation performance, the whole machine runs smoothly, low noise, and the user does not need to configure the front pump or increase the height of the inlet tank;
7)    Strong reliability of machine seal: because the rotor parts of the self-balancing high-pressure water pump do not have axial channeling when starting and stopping, and there is no axial pulsation during operation, the problem of poor reliability of machine seal has been overcome that has been plaguing multistage pumps;
8)    Easy maintenance: the self-balancing high-pressure water pump adopts three-dimensional design, CNC machining of rotor parts, which strictly ensures the processing size and processing accuracy of each component, so that the pump can be quickly assembled and disassembled, and the seals and bearings are replaced without disassembling the pump body and inlet and outlet pipelines.
9)    Low maintenance rate: The self-balancing high-pressure water pump adopts precision casting, which reduces the number of wearing parts and maintenance and disassembly, prolongs the service life of the product, greatly avoids a series of problems caused by excessive disassembly and assembly, and reduces maintenance costs;
10)    Strong applicability: The self-balancing high-pressure water pump adopts an advanced modular design, a local component that has been used in large quantities and tested for long-term operation, and the parts have a high degree of interchangeability, eliminating the small gap balance plate device, which is more suitable for the occasion with worse medium properties than the traditional structure multistage pump.