Pilot-operated type water hydraulic pressure digital proportional direction valve

Abstract

The invention discloses a pilot-operated type water hydraulic pressure digital proportional direction valve, which comprises a main valve and two pilot valves, wherein the pilot valves are positioned on the left side and the right side of the main valve respectively and are arranged on the main valve through an end face in a matching way; each pilot valve comprises a variable liquid resistor and a fixed liquid resistor which is connected in series with the variable liquid resistor; a control port communicated with the end face of a valve core of the main valve is positioned between the variable liquid resistor and the fixed liquid resistor; and the pressure of the control port can be changed by changing the resistance value of the variable liquid resistor so as to control the valve core of the main valve and control the direction and the flow rate of a liquid flow. In the invention, pulse code modulation (PCM) pilot control is adopted, so that the proportional direction valve can be simply and reliably controlled, and has high precision, high frequency and long service life; and the main valve has high flow rate. The pilot valves consist of a switching valve and a damping hole, have low leakage, high pollution resistance and high interference resistance and can be used in a marine environment containing a large number of solid impurities. The valve cores of the pilot valves are driven through piezoelectric ceramics, perform amplification displacement through a compliant mechanism and have simple driving mechanism structures, quick response and long service life.

Description

technical field [0001] The invention relates to a hydraulic control valve, in particular to a proportional directional valve. Background technique [0002] At present, underwater working tools are mainly controlled by servo valves. The servo valve is driven by a torque motor and has high control precision, but it requires high manufacturing precision, is expensive, has poor anti-pollution ability, and high maintenance cost. Servo valves are divided into two types: hydraulic servo valves and hydraulic servo valves. Leakage of the hydraulic servo valve will cause environmental pollution. It is used in a closed system in an underwater operation system, and it will withstand greater environmental pressure in the deep sea. The hydraulic servo valve is used in an open system, does not need to withstand environmental pressure, and will not cause environmental pollution due to leakage, but the leakage is serious, it is not easy to seal, it is easy to rust, and its life is short. ...

AI Technical Summary

Problems solved by technology

[0004] In order to overcome the shortcomings of traditional proportional directional valves such as large control dead zone, low precision, poor anti-pollution ability, complex structure, difficult sealing under water, short life, slow response and inability to be directly controlled by a computer, the present invention proposes a water hydraulic valve. Digital proportional directional valve for control of subsea tools

The invention adopts a three-position four-way slide valve with zero opening as the main valve, which solves the problem of large control dead zone and low precision of the traditional proportional directional valve; uses two sets of switching valves to replace the two-way proportional pressure reducing valve, and solves the problem of the traditional proportional directional valve. The problem of poor anti-pollution ability; the use of piezoelectric ceramics as the driving mechanism solves the problem that the proportional electromagnet has a complex structure and is not easy to seal underwater; the use of a compliant mechanism to replace the traditional lever amplifying mechanism solves the problem of large friction and long life of the traditional amplifying mechanism The problem of short and slow response; PCM (pulse code modulation) control is adopted to solve the problem that the traditional proportional directional valve cannot be directly controlled by the computer

Images