Boiler feed horizontal multistage pump have the advantages of a wide high-efficiency range, a broad performance range, good cavitation performance, few vulnerable parts, and easy installation and maintenance. Their reliability is greatly improved, and the fault-free operation time is more than three times that of ordinary pumps. Maintenance costs for users are significantly reduced, thereby lowering the life cycle cost of the pump. The high-pressure self-balancing segmental centrifugal pump innovates the structural form of traditional multi-stage centrifugal pumps by eliminating the axial force balancing mechanism.
The ZD series pump is a self-balancing multistage water pump, featuring high efficiency, a wide performance range, steady and safe operation, low noise, and easy installation.
The ZD series pump can deliver clean water, sewage water, corrosive liquids, hot water, seal water, and oil by selecting different materials for the flow passage parts. It is widely applied in industrial water supply and discharge, high-rise building water supply, fire fighting applications, mining water discharge, long-distance water transmission, and boiler water feeding, among others.
Model description:
ZD400 -80x10
ZD:self balance multistage pump
400:Flow: 400 m3/hr
80:Single Stage Head: 80 m
10:Number of impeller
Performance characteristics
1)Efficient and energy-saving: Due to the absence of wear and axial pulsation of the balance disk in the pump rotor, the alignment between the impeller and guide vanes remains optimal. Efficiency does not significantly decrease with the wear of the balance disk and the forward movement of rotor components, as seen in ordinary multi-stage pump structures. Additionally, there is no leakage of balancing water, reducing volume loss, improving the overall operating efficiency of the pump, and decreasing shaft power, averaging 2% to 3% higher efficiency than ordinary multi-stage pumps.
2)New structure: The impeller rotor components are symmetrically arranged, allowing the axial forces generated by each stage of symmetrical impellers to cancel each other out. The automatic balance of the substantial axial thrust in the pump chamber can be achieved without a balance disk structure, thus breaking through the traditional design of multi-stage pumps.
3)New technology: Unique throttling and pressure-reducing devices, odd-numbered balance devices, and auxiliary support functions are employed.
4)High reliability: The symmetrical arrangement of the impeller ensures that the axial thrust generated during operation is essentially self-balanced, eliminating the need for small clearances, high-pressure drops, and balance disc devices that are easily flushed, worn, and prone to failure. This minimizes the adverse effects of axial force loads on pump wear and system interference. The residual axial force is borne by the thrust bearing, ensuring that the pump shaft is always in a tensile state. The force on the shaft is uniform, and the stress peak is significantly reduced compared to the prototype structure, thereby improving the rigidity and critical speed of the pump rotor and greatly enhancing the smoothness and reliability of its operation.
5)Strong reliability of mechanical seals: There is no axial displacement of rotor components during pump start-up and shutdown, and no axial pulsation during operation, effectively overcoming the long-standing issue of poor mechanical seal reliability in multi-stage pumps.
6)Widely applicable: By eliminating the small gap balance plate, this design is more suitable for situations with more severe medium properties compared to traditional boiler feed horizontal multistage pump structures.
7)Low maintenance cost: Precision casting reduces the number of vulnerable parts and the need for maintenance disassembly, prolongs product life, and minimizes problems caused by excessive disassembly, thereby lowering maintenance costs.
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