Industry serves as the backbone of the national economy, where production processes rely on pressurized fluid handling, transportation, and circulation. As the "heart" of industrial systems, centrifugal pumps play a pivotal role in ensuring stable production lines, product quality, and energy efficiency. While traditional horizontal centrifugal pumps deliver reliable performance, they suffer from drawbacks like excessive space requirements, high energy consumption, and complex maintenance procedures. Furthermore, horizontal centrifugal pumps from different manufacturers often have incompatible models and specifications, making spare parts incompatible and driving up repair costs. The CDL/CDLF multi-stage vertical centrifugal pump, also known as the stamping-welded multi-stage centrifugal pump, has gained rapid traction in both industrial and consumer markets due to its corrosion-resistant, high-temperature-resistant, and smooth-surface design. With low maintenance costs and energy efficiency, this pump type has been widely adopted in micro and mini water pump production, thanks to its advanced manufacturing technology and ease of automated mass production.
graph ：CDL/CDLF
The CDL/CDLF multi-stage vertical centrifugal pump features a motor mounted above the pump body, connected to the shaft via a vertical coupling. This design significantly reduces installation space requirements, enabling the pump to be installed in narrow pipelines or confined environments such as deep wells or specialized equipment bases.
Figure: Light Vertical Multistage Pump
Multi-stage design: The pump body contains multiple identical impellers and guide vanes. Each time the medium passes through a stage of impellers and guide vanes, its pressure is increased. The total head is calculated by multiplying the head of a single stage by the number of stages, enabling this pump model to achieve a head far exceeding that of a single-stage pump with relatively small size and power consumption.
Figure: Inner core
High-efficiency hydraulic models and flow components: The impeller and guide vanes are designed using precision hydraulic models, typically optimized through computational fluid dynamics (CFD) to ensure smooth flow channels and uniform flow velocity, thereby minimizing hydraulic losses and enhancing pump efficiency.
The impeller typically features backward-curved blades, a design that delivers stable performance and excellent cavitation resistance. Flow components (including the impeller, guide vanes, and pump body) are generally constructed from corrosion-resistant and wear-resistant materials like stainless steel (304,316), ensuring the pump's longevity and reliability when handling clear water or mildly corrosive liquids.
Figure: Impeller
Reliable shaft sealing and balancing systems: Shaft sealing system: Standard CDL/CDLF pumps utilize mechanical seals, which offer advantages such as minimal leakage, extended service life, and low power consumption. Depending on the temperature, pressure, and properties of the conveyed medium, mechanical seals can be selected from various materials (e.g., silicon carbide, alumina, cemented carbide) and configurations. For more demanding operating conditions, dual-face mechanical seals or integrated seals can be configured.
Axial Force Balance: Multi-stage pumps generate substantial axial forces during operation. CDL/CDLF pumps typically employ either a "balance drum" or a "balance drum + balance disc" configuration to neutralize most axial forces, with the residual portion being absorbed by the thrust bearing at the motor end. This design significantly reduces bearing loads, thereby enhancing the operational stability and service life of rotor components.
Rotor dynamics design: The pump shaft is typically fabricated from high-strength stainless steel and undergoes precision dynamic balancing (typically achieving G6.3 or higher standards) to ensure smooth operation at high speeds, minimizing vibration and noise.
The reasonable bearing arrangement (upper and lower guide bearings) provides stable support for the pump shaft, ensures uniform clearance between the impeller and stationary components such as the sealing ring, and maintains the high-efficiency operation of the pump.
Figure: Support guide vane
IPv6 network supported.