Abstract
There are the problems of low flow control accuracy, small flow control difficulty, and limited flow range in the traditional pressure-compensation flow-control valve. For this, a method of continuous control pressure drop Δp <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rated</sub> to control flow-control valve flow is proposed. And the precise control of small flow is realized by reducing the pressure drop Δp <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rated</sub> . In the research, the flow-control valve with controllable pressure compensation capability (FVCP) was designed firstly and theoretically analyzed. Then the sub-model model of PPRV and traditional flow-control valve were established and verified through experiments respectively. Finally, the accurate co-simulation model of the FVCP was established. The continuous control characteristics of pressure drop Δp <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">rated</sub> , the flow characteristics of FVCP, and the influence of different parameters d <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> were studied. The research results demonstrate that, compared with the traditional flow-control valve, the designed FVCP can adjust the compensation pressure difference in the range of 0.3 ~ 1.7 MPa in real-time. And the flow rate can be altered within the range of 44% ~ 100% of the rated flow. The diameter d <sub xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sub> of the console shoulder has almost no effect on the compensator operating characteristics.
Highlights
Due to the characteristics of high power density and large output force, the hydraulic transmission system is widely used in various kinds of mobile machinery [1]-[3]
Where Cd is the flow coefficient, Ad is the opening area of main throttling orifice, ρ is the oil density. It can be seen from formula (4) that, the pressure drop prated is only related to the pump outlet pressure pp and the maximum load pressure pLS, and is independent with the load pressure of working port A or B
SIMULATION AND EXPERIMENT OF TRADITIONAL FLOW-CONTROL VALVES Using the actual structure parameters, the traditional flowcontrol valve model is first established in the Simulation X software, which includes the main throttle orifice, the direction valve orifice, and the pressure compensator
Summary
Due to the characteristics of high power density and large output force, the hydraulic transmission system is widely used in various kinds of mobile machinery [1]-[3]. THE THEORETICAL ANALYSIS AND CALCULATION OF FVCP The new principle is to change the compensator spool force relationship by controlling the output pressure of PPRV, thereby changing the pressure drop prated at the main throttle orifice of the FVCP. Both sides of the compensator spool are controlled by the outlet pressure p1 of the main throttle orifice and the maximum load pressure pLS respectively. Where Cd is the flow coefficient, Ad is the opening area of main throttling orifice, ρ is the oil density It can be seen from formula (4) that, the pressure drop prated is only related to the pump outlet pressure pp and the maximum load pressure pLS, and is independent with the load pressure of working port A or B. The compensator shoulder diameter d2 is initially determined to be 36 mm
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