A high-precision error correction method for multiple low-pressure gradient proportional solenoid valves

Abstract

The invention discloses a high-precision error correction method for multi-component low-pressure gradient proportional solenoid valves. The method includes that sustaining time parameters of a valveopening voltage, a sustaining voltage and a high voltage of each proportional solenoid valve is preset; the valve opening voltage and the sustaining voltage use independent direct current voltages; the valve opening voltage is set to be 1-4 times of a nominal voltage; the sustaining voltage is set to be 1 / 5-1 / 2 of the nominal voltage; the sustaining time of the sustaining voltage is set to 1.1-2.5times of the opening time of the proportional solenoid valves; the opening and closing time of each proportional solenoid valve are synchronous through the adjustment of the valve opening voltage, the sustaining time of the high voltage, and the opening and closing time of the proportional solenoid valve controlled by the sustaining voltage; and a right moment of opening and closing the proportional solenoid valves is controlled by advancing or delaying the valve opening time; The method has the beneficial effects that the control is accurate, the opening and closing time of each valve are synchronous, the control precision of the liquid phase mixing is effectively ensured, and the influence of air pumping and non-linear flow rate on the liquid phase proportional control precision is avoided.

Description

technical field [0001] The invention belongs to the technical field of proportional solenoid valve control, and in particular relates to a high-precision error correction method for multi-component low-pressure gradient proportional solenoid valves. Background technique [0002] Fluid proportional mixing control is widely used in high-performance liquid chromatography, automatic diluter, automatic drug delivery device and other precision fluid instruments and equipment. Proportional mixing can be used to produce solutions with different pH and concentration on-line, or to achieve pH, concentration, and ratio gradients that vary with time. In high performance liquid chromatography (HPLC), a low-pressure gradient chromatography system is generally used, and the multi-component low-pressure gradient chromatography system passes through Control the opening and closing of several proportional solenoid valves to mix the liquid components in specified proportions before the liquid ...

AI Technical Summary

Problems solved by technology

The working principle and mechanical structure of the proportional solenoid valve determine that its behavior of power-on opening and power-off closing is very complicated, especially the electrical characteristics of the electromagnetic coil and the magnetic properties of the armature are the key factors affecting the opening and closing of the proportional solenoid valve. Due to the constraints of production technology and material science, the cost of producing high-precision proportional solenoid valves with consistent characteristics is extremely high and difficult. At the same time, a high yield rate cannot be guaranteed. In order to obtain high-consistency proportional solenoid valves, manpower and material resources have to be spent Pick and match, time-consuming and labor-intensive

[0005] Therefore, aiming at the problem that the existing proportional solenoid valve control technology has insufficient precision in liquid mixing ratio control in precision fluid instruments such as high performance liquid chromatography, the present invention discloses a high-precision error control technology for multi-component low-pressure gradient proportional solenoid valves. Correction method

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