Detailed Description
The ZLB and ZLQ type pumps are single-stage vertical axial flow pumps. They are suitable for conveying clean water, wastewater, or slightly corrosive liquids, with the temperature of the conveyed liquid generally not exceeding 50°C. This type of pump is a high-flow, low-head pump, which can be used in salt factories, aquaculture, water supply and drainage, wastewater treatment, power plant circulating water supply, agricultural irrigation and drainage, shipyard water level control, and other hydraulic engineering projects. It can also be used in metallurgy, chemical industries, and other sectors (special requirements can be designed separately), with a very wide range of applications.
II. Structural Features:
Vertical axial flow pumps can be designed in a dual-base layered structure or a single-base structure with direct coupling of the motor to the pump.
A. Double-base vertical layered structure
1. The pump is mainly composed of the pump body, transmission unit, and drive shaft, etc.
1) The axial flow pump consists of an inlet bell mouth, impeller, guide vane body, outlet elbow, shaft, bearings, gland packing, etc. The pump shaft is supported at both ends by upper and lower pairs of water-lubricated rubber bearings and Spherical Roller bearings, with the shaft neck surface being chrome-plated.
2) Each end of the pump shaft is equipped with a set of nuts, which are respectively fixed to the impeller hub and the coupling. During operation, all axial forces are supported by thrust bearings within the transmission unit. The axial displacement of the pump rotor is adjusted by a circular nut within the transmission unit.
3) The axial force of the axial flow pump, the weight of the drive unit and motor, and the weight of the rotor are all supported by the floor foundation of the supporting drive unit. The weight of the pump casing is supported by the foundation.
4) A middle drive shaft is installed between the vertical motor and the pump, with the motor end equipped with an elastic coupling and the pump end with a rigid coupling. The motor installation elevation is agreed upon by the user and the manufacturer.
5) The drive shaft length is generally used within the dimensions specified in the installation outline diagram. If it exceeds the specified size, a middle bearing must be installed.
6) Axial flow pump discharge channels typically use a straight-conical diffuser discharge pipe, equipped with a discharge valve at the end.
2. The impeller has undergone static balance testing.
3. For cylindrical impeller designs, they are typically integrated with the inlet trumpet. The blade installation angle is set according to customer requirements and is installed in one go, with no alterations allowed. For spherical impeller chambers, users can adjust the blade installation angle as needed during shutdown.
4. The gap between the outer edge of the impeller and the impeller chamber is approximately 0.1% of the impeller's outer diameter. When transporting sludge and impurities, the gap should be appropriately increased.
5. Direction: The pump rotates clockwise when viewed from above the motor direction.
B. Directly coupled motor and pump single foundation structure
1. Pumps are directly connected to the motor via the motor bracket, with the outlet designable above or below the foundation layer according to engineering requirements.
2. The axial water thrust of the pump becomes an internal force of the unit, not transmitted to the foundation, significantly reducing the design strength requirements for the foundation load.
3. Pumps are easy to install, align, and maintain; no intermediate drive shaft is required.
4. Axial flow pumps can be designed as either rotor part removable or whole unit removable.
5. Pump shafts can be fitted with protective tubes for protection. Clean water is used for lubrication and cooling of sliding bearings to accommodate conditions with particle-containing media.
6. Axial flow pump inlet channels can utilize elliptical inlet flow channels to enhance anti-cavitation and equipment efficiency.
