Variable Displacement Vane Pumps
A variable displacement vane pump is a hydraulic power component with adjustable displacement. It dynamically adjusts the pump's output flow to meet system demands, significantly enhancing energy efficiency and system flexibility. Its core feature is the ability to achieve stepless flow regulation by changing the eccentricity between the stator and rotor or the volume of the vane working chamber. It is suitable for hydraulic systems requiring dynamic load response or energy-saving solutions.
Variable displacement vane pumps include the following key adjustment components in addition to those found in fixed displacement pumps:
- Movable stator ring: Changes the eccentricity between the stator and rotor through external control (e.g., pressure, electrical signal).
- Adjustment mechanism: Contains control pistons, springs, feedback valves, etc., which drive the stator's position change.
- Pressure compensator: Automatically adjusts displacement based on system pressure to maintain a set pressure.
- Proportional solenoid valve (optional): Precisely controls displacement via electrical signals (for electronically controlled types).
Other core components are similar to fixed pumps, including the rotor, vanes, distribution plate, and sealing components.
- Energy efficient: Automatically adjusts flow based on load demand, reducing overflow losses; energy consumption is 30% to 50% lower than fixed pumps.
- Fast dynamic response: Adjustment mechanism response time is ≤50ms, adapting to frequently changing load conditions.
- Wide pressure range: Rated pressure can reach 14-25MPa, with some high-pressure models supporting 35MPa.
- Multi-functional control: Supports various control modes, including pressure compensation, load sensing, and electro-proportional control.
- Low noise design: Optimized stator curve and vane quantity (12-16 vanes) result in noise levels ≤65dB(A).
- Long lifespan: Features hardened vanes and a self-adaptive wear compensation structure, with a lifespan of ≥15,000 hours.
- Industrial automation: Multi-stage pressure and flow control systems for injection molding machines and die-casting machines.
- Mobile machinery: Energy-saving hydraulic systems for excavators and cranes (load-sensing control).
- Machine tool equipment: Spindle speed drive, self-adaptive adjustment of fixture pressure.
- Energy industry: Pitch control hydraulic systems for wind turbines.
- Aerospace: High-precision flow control units for flight servo actuators.
