Vertical shaft mixed flow pump, vertical shaft axial flow pump MODEL VPF,VPS

Oil and gas, petrochemical plants, power plants, water supply and sewerage, storm water drainage, etc.

Product Introduction

Vertical shaft mixed flow pumps (MODEL VPF) are used in pumping, drainage, sewage, power plants, LNG, petrochemical plants, etc.
We manufacture highly reliable pumps through design verification and quality control, including FEM and CFD analysis and water tank model testing.

Material

Part Name Standard Materials
Impeller Stainless steel/duplex stainless steel/super duplex stainless steel, etc.
Main axis Stainless steel/duplex stainless steel/super duplex stainless steel, etc.
Casing Cast iron/2% nickel cast iron/stainless steel/duplex stainless steel/super duplex stainless steel, etc.
Liner Ring Stainless steel/duplex stainless steel/super duplex stainless steel, etc.

Accessories

  • motor

  • engine

  • Gas turbine

  • Gearbox

  • Forced Lubrication Device

  • Wing angle control device

  • Discharge valve

  • Flexible Pipe

  • Strainer

  • Operation panel

Delivery record

  • For power plants

    Model: ø3000 2-bed vertical shaft movable vane mixed flow pump

    Specifications: 91000m³/h 195kPa 6200kW

  • Petrochemical

    Model: ø450 vertical shaft mixed flow pump

    Specifications: 2100m³/h 102m 900kW

Pump structure

Pump Type

  • The pump types are classified as follows:
    • Installation method: Single bed type/Two bed type/Pit barrel type
    • Structure: Non-pullout type/Inner cylinder pullout type/Rotating body pullout type
    • Pump thrust: Pump-held/Driver-held
    • Impeller: Fixed blade/movable blade
  • The pump type is determined taking into consideration the following:
    • Comparison of machine and civil engineering costs
    • Installation location and water intake level
    • Maintenance and Inspection

  • Non-pullout type

  • Pull-out type

Thrust bearing

  • RollingBearing Unit

    The thrust bearing is located either in the pump or in the driver.
    When fitted to a pump, they use either rolling bearings or tilting pad bearings.
    The standard structure is an oil bath rolling bearing.
    For large thrust loads, tailing pad bearings are used.

  • Radial bearings

    • Underwater rubber bearings

      Water injection is required at start-up. It has a long track record and is highly reliable.

    • Waterless bearing

      This bearing does not require water injection during start-up, eliminating the need for a water injection system.

Adjustable vane pump

By continuously adjusting the opening of the blades, the required discharge volume and total field can be obtained, resulting in energy savings.

There are two types of blade angle control systems: hydraulic and mechanical.
The pump starts with the vane opening at a minimum, which reduces the starting torque.
It is possible to always operate near the point of maximum efficiency.

The HQ curve, system resistance curve, and shaft power curve are shown as indicated.
The operating point of the pump is the intersection of the HQ curve and the system resistance curve.
The shaft power corresponds to each operating point on the HQ curve.
The shaded areas are energy-saving areas.

  • Pump Rotor

  • Operating characteristics of adjustable vane pumps.

  • Comparison of hydraulic and mechanical systems

Hydraulic Mechanical
Power Source Hydraulic Electric Actuator
Pump diameter Over 1500mm Less than 2500mm
How it works The blade angle is controlled by moving the operating rod up and down via a hydraulic servo cylinder and servo piston. The actuator moves the operating rod up and down via a worm gear and screw mechanism to control the blade angle.
Position of the blade angle control system Drive unit top Between the pump and the driver
Features
  • High output is obtained
  • The blade angle control system is compact and allows the pump height to be reduced.
  • The drive shaft needs to be hollow.
  • Hydraulic system required.
  • For small and medium output.
  • The blade angle control system is relatively large and the pump height is high.
  • There is no need to hollow out the drive shaft.
  • No hydraulic system required.