Axial Flow Pumps

ZLD,ZLB,ZB Series Axial Flow Pumps

Products: The ZLD (vertical), ZLB (vertical semi-adjustable), and ZB (horizontal) series of axial-flow pumps feature an impeller resembling an aircraft propeller, with liquid drawn in and discharged axially.

Advantages:

Extreme high-flow performance: Axial-flow pumps are designed specifically for high-flow applications. Under low heads (typically 1-15 meters), their flow output per unit size far exceeds that of other pump types, resulting in exceptionally high efficiency.

Relatively simple structure and high cost-effectiveness: Due to axial flow, the flow path is straight and short, resulting in a relatively simple hydraulic model. For similar high-flow requirements, manufacturing costs and construction requirements are typically lower than those of comparable mixed-flow or centrifugal pumps.

Multiple adjustment options: The blade angle of models like the ZLB can be semi-adjusted during shutdown, or fully adjustable in higher-end models, allowing for variable pump performance over a wide range of operating conditions and providing excellent adaptability.

Selling Points:

"King of High-Flow": In the low-head range, it is the unrivaled choice for achieving the largest water transfers.

"The King of Cost-Effectiveness for Low-Head Operation": Accomplishes massive water transport tasks at the lowest per-cubic-meter water transport cost.

"A Flexible Giant": Its adjustable blade design allows it to better adapt to seasonal or cyclical fluctuations in water levels and flow.

Applications:

Large-Scale Farmland Irrigation and Drainage in Plain Areas: Particularly suitable for areas with flat terrain requiring rapid irrigation or drainage.

Urban Flood Control and Drainage Pumping Stations: Serving as a core pump type, they rapidly drain urban waterlogging into external waterways during flood season.

Large Industrial Circulating Water Systems: For example, the once-through cooling water systems of steel mills and power plants draw water from rivers and lakes.

Dock Drainage and Canal Water Level Regulation: Applications requiring rapid raising or lowering of large volumes of water.

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Product Description

The company offers a comprehensive range of pumps, including the ZLDB series vertical single-stage long-shaft axial flow pumps, HLDB series vertical single-stage long-shaft mixed flow pumps, ZLD, ZLB, ZB series axial flow pumps, QZ series submersible axial flow pumps, QH series submersible mixed flow pumps, QW series submersible sewage pumps, LWB series vertical slurry pumps, ZS series sand suction pumps, ZPW series sewage pumps, and HW series mixed flow pumps. With strong technical capabilities, the company possesses the expertise to develop and manufacture high-level complete sets of hydraulic machinery and other mechanical products, with its quality certified by ISO9001. Adhering to the principle of "quality first, customer first," the company is committed to providing satisfactory services to all customers. Friends from all walks of life are welcome to visit!

Product Overview

Model Description

Among them: ZLD is the transmission method

The ZLDB series vertical single-stage long-shaft axial flow pump, HLDB series vertical single-stage long-shaft mixed flow pump, ZLD, ZLB, ZB series axial flow pumps, QZ series submersible axial flow pumps, QH series submersible mixed flow pumps, QW series submersible sewage pumps, LWB series vertical slurry pumps, ZS series sand suction pumps, ZPW series sewage pumps, and HW series mixed flow pumps. The company possesses strong technical capabilities and the ability to develop and produce high-level complete sets of hydraulic machinery and other mechanical products, with quality certified by ISO9001. Adhering to the principle of "quality first, customer above all," the company is committed to providing satisfactory services to users and welcomes friends from all sectors to visit!

Model Description

Note: ZLDB and HLDB products are standard specifications. For large-diameter or special specification products, our company is willing to provide customized designs to deliver products that meet customer satisfaction.

Structural Description
The ZLB axial flow pump features a vertical structure, primarily consisting of the pump body and transmission components. The pump body mainly includes an intake、impeller assembly, guide vane body, rubber bearing, pump shaft, outlet elbow, and packing seal.
The impeller component consists of the impeller base, blades, and tightening nut. It undergoes static balance verification before leaving the factory. When users need to adjust the blade installation angle, they can disassemble the impeller component, loosen the tightening nut, rotate the blades (if there are locking screws, they must be removed), align the blade reference line with the corresponding angle markings on the impeller base, and then tighten the nut. Unless otherwise specified, the blade installation angle is set at 0° by default. Users can adjust it based on the performance curve and performance parameter table according to their operational requirements.

The pump shaft is made of high-quality carbon structural steel (45 steel), with the journal surface chrome-plated to enhance wear and corrosion resistance. The radial support of the pump shaft is borne by an upper and lower rubber bearing. Before starting, clean water must be supplied to the guide pipe in the stuffing box to lubricate the upper rubber bearing, and the water supply should be stopped only after the pump has started discharging water.

At the shaft hole of the discharge elbow, a packing seal is employed, consisting of a packing gland, packing (oil-impregnated asbestos packing), and a packing cover.

From the coupling end, the impeller rotates clockwise.

Transmission section: Based on usage requirements and power configuration, users should specify the transmission method when placing orders. There are two transmission methods available:

(1) Vertical Motor Direct Drive Unit

The vertical motor is mounted on the motor base. The upper end of the drive shaft is connected to the motor shaft via an elastic coupling, while the lower end is connected to the pump shaft with a rigid coupling. During pump operation, all axial forces are borne by the thrust bearing within the transmission device. The axial displacement of the pump rotor can be adjusted by the nut inside the transmission device.

(2) Vertical Motor Triangular Belt Drive Mechanism

The vertical motor is installed on the frame and connected to the driving wheel via a flat key. By adjusting the screw, the frame can slide along the guide rails to regulate the belt tension. The pulley is fixed on the drive shaft using a coupling. During pump operation, the axial force is supported by the thrust bearing on the pulley housing, while the belt tension is transmitted to the pulley housing through the radial bearing, ensuring the drive shaft is free from radial forces. The axial displacement of the pump rotor can be adjusted by the nut at the top of the transmission device. The drive shaft of the axial-flow pump should not be excessively long. Users must design the pump station based on the specified "L" dimension range in the installation outline drawing.

The pump outlet accessories include 30° elbows, straight pipes, expansion joints, diffusers, and other components, with an outlet valve installed at the end. Users can select the appropriate options based on actual conditions and specify them during ordering.

Support of the Pump: The weight of the pump body (excluding the rotor section) is borne by the foundation or beams supporting the pump body, while the weight of the transmission device, motor, and axial forces (including the weight of the rotor section) are supported by the floor bearing the transmission device.

Both the ZLDB and HLDB pumps feature a vertical single-basis long-shaft structure, with a semi-adjustable impeller design. When it is necessary to change the blade angle, the blade fastening screws can be loosened, and the slot screws removed. The blades can then be rotated to align the markings on the blades with the corresponding angle graduations on the impeller housing. After tightening the screws and reassembling the slot screws, the operating conditions can be adjusted accordingly.

Both types of pumps adopt a single base structure, with the motor directly connected to the pump. There are two structural configurations: one with the outlet above the base and another with the outlet below the base.

The vertical motor is mounted on the frame and connected to the driving wheel via a flat key. The adjustment screw allows the frame to slide along the guide rail to adjust belt tension. The pulley is fixed on the drive shaft using a coupling. During pump operation, the axial force is supported by the thrust bearing on the pulley housing, while the belt tension is transmitted to the pulley housing through the radial bearing, ensuring the drive shaft remains free of radial forces. The axial displacement of the pump rotor can be adjusted via the nut at the top of the transmission device. The drive shaft of the axial flow pump should not be excessively long, and users must design the pump station according to the specified "L" dimension range in the installation outline drawing.

The pump discharge accessories include 30° elbows, straight pipes, expansion joints, diffusers, and others, with a discharge valve installed at the end. Users can select the appropriate options based on actual conditions and specify them when placing orders.

Support of the pump: The weight of the pump body (excluding the rotor section) is supported by the foundation or beam that holds the pump body, while the weight of the transmission device, motor, and axial force (including the weight of the rotor section) is borne by the floor that supports the transmission device.

Both the ZLDB and HLDB pumps feature a vertical single-basis long-shaft structure with a semi-adjustable impeller design. When blade angle adjustment is required, the blade fastening screws can be loosened, the locking screws removed, and the blades rotated to align the markings on the blades with the corresponding angles on the impeller housing

Adjust the gauge lines, then tighten the screws and re-tighten the seam screws to achieve the desired operating condition.

Both types of pumps adopt a single base structure, with the pump directly connected to the motor. There are two structural configurations: one with the outlet above the base and the other with the outlet below the base.

The ZLDB and HLDB-type pumps generally consist of an intake, impeller assembly, impeller housing, guide vane body, intermediate connecting pipe, coupling assembly, elbow pipe, pump shaft, drive shaft, transmission device, intermediate bearing, shaft protection tube, packing box assembly, and coupling. The impeller assembly is composed of components such as blades and the impeller housing guide water cone. In small and medium-sized pumps, the impeller is connected to the pump shaft using flat keys and nuts, while in large pumps, the upper end of the impeller hub is connected to the main shaft via a flange. The pump guide bearing is a rubber bearing, lubricated with clean water. The pump shaft is equipped with a shaft protection tube, which contains clean pressurized water to lubricate the rubber bearing. Depending on user requirements, the pump guide bearing can also be replaced with a self-lubricating composite material bearing, eliminating the need for a shaft protection tube. During pump startup, no lubrication water is required, and normal operation is achieved with flowing water lubrication. The bearing section of the pump shaft is chrome-plated or fitted with a stainless steel bushing, and a packing seal is installed at the elbow pipe exit.

The axial water thrust of ZLDB and HLDB pumps is borne by the water pump, with a diameter of 350mm-1000mm. The vertical motor is installed on the motor base of the water pump and connected to the transmission shaft through an elastic coupling. The motor seat is equipped with radial bearings and thrust bearings. The thrust bearings can withstand the axial force generated by the operation of the water pump. The bearings are installed in the bearing box and lubricated with grease or thin oil; The bearing box with higher power has a water-cooled interlayer outside, and clean cooling water is introduced during use. The water pump with high supporting power adopts a vertical synchronous motor, and the axial water thrust is borne by the thrust bearing of the motor. The pump is directly driven by the motor through a rigid coupling.

Looking down from the coupling, the water pump rotates clockwise.

The outlet channel of a pump generally adopts a straight pipe outlet, which is connected to an outlet valve after passing through a diffusion pipe. Large pumps can also adopt a siphon outlet channel, equipped with a vacuum breaking valve to cut off the flow.

The installation and disassembly of this type of pump are all completed on the motor floor slab, and people do not need to enter the water pool below the pump room. During maintenance, there is no need to drain the water from the inlet pool. To prevent the cold winter from freezing and damaging the water pump components, the water pump can be easily lifted out of the pool. Due to the pump being a whole, the entire pump drive shaft can be ensured to be concentric with the pump shaft, and there is no need to calibrate the concentricity of the pump shaft and drive shaft during installation.