Variable Frequency Centrifugal Pump
Frequency Conversion Technology and Working Mechanism
Integrating frequency conversion control technology with the core structure of centrifugal pumps, the variable frequency centrifugal pump realizes precise stepless adjustment of flow rate and head through real-time adjustment of impeller speed by a frequency conversion motor, and is the core equipment of energy-saving conveying systems. The working mechanism of this variable frequency centrifugal pump breaks through the limitation of traditional "valve throttling adjustment". It monitors changes in pipeline pressure through a PLC control system, automatically adjusts the motor speed, makes the pump output accurately match the actual demand, and greatly reduces energy consumption.
Structural Design and Key Performance
Structurally, it integrates a frequency conversion control cabinet, a pressure sensor and a high-efficiency impeller, and adopts intelligent seal monitoring technology to provide real-time early warning of leakage risks.
significant performance advantages
|
Parameter Name (Symbol) |
Core Function |
Range |
|
Flow Rate (Q) |
Indicates the hourly sewage delivery capacity and determines sewage discharge efficiency |
1-1000m³/h (Small-sized: 1-50m³/h; Large-sized: 50-1000m³/h) |
|
Head (H) |
Determines the sewage lifting height and long-distance conveying capacity |
5-100m (Small-sized: 5-30m; Large-sized: 30-100m) |
|
Power (P) |
Motor driving power, directly affecting the upper limits of flow rate and head performance |
0.75-320kW |
|
Caliber (DN) |
Diameter of water inlet and outlet, which shall match the on-site sewage pipe size |
25-300mm |
|
Medium Temperature |
Adapts to sewage of different temperatures to avoid equipment damage |
Normal Temperature Type (≤40℃); High Temperature Type (≤100℃) |
|
Medium Concentration |
Refers to the solid particle content in sewage, affecting the pump's anti-clogging and wear resistance |
Solid Content ≤10%-30% |
|
Parameter Name (Symbol) |
Core Function |
Common Range/Description |
|
Flow Rate (Q) |
Volume of fluid delivered per unit time, reflecting the pump's delivery capacity |
Several L/min to thousands of m³/h; Common units: m³/h, L/min |
|
Head (H) |
Energy obtained per unit weight of fluid, reflecting the pump's ability to overcome resistance and lift fluid |
Single-stage ≤125m; Multi-stage up to thousands of meters (Unit: m water column) |
|
Rotational Speed (n) |
Impeller rotation speed, matched with the motor, directly affecting flow rate and head |
Common: 2900r/min, 1450r/min |
|
Efficiency (η) |
Ratio of effective power to shaft power, reflecting energy conversion efficiency |
Ordinary type: 90%-98%; Highest efficiency under design conditions |
|
Net Positive Suction Head (NPSH) |
Minimum suction pressure margin to prevent cavitation in the pump and protect the impeller |
Unit: m; Device margin must be greater than required margin |
|
Medium Adaptability |
Determines the material selection of pump body and components to ensure equipment durability |
Including temperature, viscosity, corrosiveness, solid content; Select materials as needed |
Application Scenarios and Energy-Saving Advantages
The variable frequency centrifugal pump is suitable for scenarios with high requirements for flow stability and variable working conditions, such as secondary water supply systems in high-rise buildings (automatically adjusting with water consumption), central air conditioning water circulation systems, and feed control of chemical reactors. It is especially suitable for long-term operation energy-saving renovation projects.
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