关键词: 2D阀, 压扭联轴器, 比例阀, 比例电磁铁

Abstract: A ball-screw type axial compression-torsion coupling was proposed herein. This design achieved an output force amplifications for about 20 times, which effectively overcome the disadvantages of small flows of proportional directional valves caused by proportional solenoid magnetic saturation. The coupling connected 2D directional valves and proportional electromagnets by compression-torsion  amplification drive technology. The electromagnetic forces were transformed into the pressure differences from both ends of the spools, which was sufficiently capable of overcoming the frictional forces, clamping forces and nonlinear hydrodynamic forces etc. The pressure distribution and flow field distribution from the main valve P-A and the pilot stage, the steady-state fluid force were simulated and analyzed. Theoretical and experimental studies show that the compression-torsion coupling effectively enlarges the electromagnetic forces. The step response of the valves is about 0.35s, and the frequency characteristics at -90° is about 4Hz at a flow rate of about 210L/min. The step characteristics is not improved obviously by superposing dithering, but the latter may effectively satisfy the following features between the spool displacement and the electromagnet displacement.

Key words: 2D valve, compression-torsion coupling, proportional valve, proportional electromagnet