压电驱动精密流量阀特性的研究
发布时间：2018-07-27 18:51
【摘要】：目前,国内大部分高压流体远程控制阀大多是采用手动控制,不利于自动控制及远程控制；即使是自动控制阀,也多采用电磁力矩马达作为驱动部分,其结构复杂、体积重量大、工作频响低、冲击大、响应速度慢、分辨率不高、控制精度低、抗干扰能力差,另外,在很多研究领域,都是需要微小流量来完成系统控制,以达到减小系统体积、重量、降低能耗损失以及提高系统性能的目的,但同时又必须承受高低压及高低温等特殊因素的影响。本文采用压电陶瓷与金属橡胶两种材料来设计一种新型的精密流量阀。 本文主要研究了流量阀的流量特性、阀腔体内的流场分布特性和阀出口处的平纹波特性。基于达西定律和流体质量守恒定理建立了阀流量特性的数学模型,采用matlab软件分析了金属橡胶几何参数以及阀进出口压差对阀流量特性的影响；采用Fluent12.0软件仿真分析了圆角半径、阀芯半锥角对其流场特性的影响,以及金属橡胶参数对流量阀平纹波特性的影响规律。分析结果表明,该阀的流量特性不仅与驱动电压有关,还与金属橡胶环参数有关,圆角半径以及阀芯半锥角对阀腔内流场的分布也有很大的影响,在阀进出口处安装金属橡胶环后,可使流出阀的流体速度变化平缓、方向趋于一致,流动更为平缓,一定程度上确保了阀输出流量/压力的稳定性,从而在一定的范围内实现平纹波处理的功能。
[Abstract]:At present, most of the domestic high pressure fluid remote control valves mostly use manual control, which is not conducive to automatic control and remote control. Even the automatic control valve, electromagnetic torque motor is often used as the driving part, its structure is complex. Large volume weight, low frequency response, large impact, slow response speed, low resolution, low control precision and poor anti-interference ability. In addition, in many research fields, small flow rate is required to complete system control. In order to reduce the volume and weight of the system, reduce the loss of energy consumption and improve the performance of the system, but at the same time must bear the high and low pressure and high and low temperature and other special factors. In this paper, piezoelectric ceramic and metal rubber are used to design a new precise flow valve. This paper mainly studies the flow characteristics of the flow valve, the distribution of the flow field in the valve chamber and the flat ripple characteristics at the outlet of the valve. Based on Darcy's law and the conservation theorem of fluid mass, the mathematical model of valve flow characteristics is established, and the influence of metal rubber geometry parameters and valve inlet and outlet pressure difference on valve flow characteristics is analyzed by matlab software. The influence of radius of circular angle and half cone angle of valve core on the flow field characteristics and the influence of metal rubber parameters on the flat ripple characteristics of flow valve were analyzed by Fluent12.0 software. The analysis results show that the flow characteristics of the valve are not only related to the driving voltage, but also to the parameters of the metal rubber ring. The distribution of the flow field in the valve cavity is greatly affected by the radius of the circular angle and the half cone angle of the valve core. After the metal rubber ring is installed at the inlet and outlet of the valve, the fluid velocity of the outlet valve changes slowly, the direction tends to be consistent, and the flow is more smooth, which to some extent ensures the stability of the output flow / pressure of the valve. In order to achieve a certain range of flat wave processing function.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.522
本文编号：2148820
[Abstract]:At present, most of the domestic high pressure fluid remote control valves mostly use manual control, which is not conducive to automatic control and remote control. Even the automatic control valve, electromagnetic torque motor is often used as the driving part, its structure is complex. Large volume weight, low frequency response, large impact, slow response speed, low resolution, low control precision and poor anti-interference ability. In addition, in many research fields, small flow rate is required to complete system control. In order to reduce the volume and weight of the system, reduce the loss of energy consumption and improve the performance of the system, but at the same time must bear the high and low pressure and high and low temperature and other special factors. In this paper, piezoelectric ceramic and metal rubber are used to design a new precise flow valve. This paper mainly studies the flow characteristics of the flow valve, the distribution of the flow field in the valve chamber and the flat ripple characteristics at the outlet of the valve. Based on Darcy's law and the conservation theorem of fluid mass, the mathematical model of valve flow characteristics is established, and the influence of metal rubber geometry parameters and valve inlet and outlet pressure difference on valve flow characteristics is analyzed by matlab software. The influence of radius of circular angle and half cone angle of valve core on the flow field characteristics and the influence of metal rubber parameters on the flat ripple characteristics of flow valve were analyzed by Fluent12.0 software. The analysis results show that the flow characteristics of the valve are not only related to the driving voltage, but also to the parameters of the metal rubber ring. The distribution of the flow field in the valve cavity is greatly affected by the radius of the circular angle and the half cone angle of the valve core. After the metal rubber ring is installed at the inlet and outlet of the valve, the fluid velocity of the outlet valve changes slowly, the direction tends to be consistent, and the flow is more smooth, which to some extent ensures the stability of the output flow / pressure of the valve. In order to achieve a certain range of flat wave processing function.
【学位授予单位】：南昌大学
【学位级别】：硕士
【学位授予年份】：2012
【分类号】：TH137.522
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