發(fā)布時(shí)間：2018-07-27 18:51

【摘要】：目前,國(guó)內(nèi)大部分高壓流體遠(yuǎn)程控制閥大多是采用手動(dòng)控制,不利于自動(dòng)控制及遠(yuǎn)程控制；即使是自動(dòng)控制閥,也多采用電磁力矩馬達(dá)作為驅(qū)動(dòng)部分,其結(jié)構(gòu)復(fù)雜、體積重量大、工作頻響低、沖擊大、響應(yīng)速度慢、分辨率不高、控制精度低、抗干擾能力差,另外,在很多研究領(lǐng)域,都是需要微小流量來(lái)完成系統(tǒng)控制,以達(dá)到減小系統(tǒng)體積、重量、降低能耗損失以及提高系統(tǒng)性能的目的,但同時(shí)又必須承受高低壓及高低溫等特殊因素的影響。本文采用壓電陶瓷與金屬橡膠兩種材料來(lái)設(shè)計(jì)一種新型的精密流量閥。 本文主要研究了流量閥的流量特性、閥腔體內(nèi)的流場(chǎng)分布特性和閥出口處的平紋波特性�；�于達(dá)西定律和流體質(zhì)量守恒定理建立了閥流量特性的數(shù)學(xué)模型,采用matlab軟件分析了金屬橡膠幾何參數(shù)以及閥進(jìn)出口壓差對(duì)閥流量特性的影響；采用Fluent12.0軟件仿真分析了圓角半徑、閥芯半錐角對(duì)其流場(chǎng)特性的影響,以及金屬橡膠參數(shù)對(duì)流量閥平紋波特性的影響規(guī)律。分析結(jié)果表明,該閥的流量特性不僅與驅(qū)動(dòng)電壓有關(guān),還與金屬橡膠環(huán)參數(shù)有關(guān),圓角半徑以及閥芯半錐角對(duì)閥腔內(nèi)流場(chǎng)的分布也有很大的影響,在閥進(jìn)出口處安裝金屬橡膠環(huán)后,可使流出閥的流體速度變化平緩、方向趨于一致,流動(dòng)更為平緩,一定程度上確保了閥輸出流量/壓力的穩(wěn)定性,從而在一定的范圍內(nèi)實(shí)現(xiàn)平紋波處理的功能。
[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.
【學(xué)位授予單位】：南昌大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH137.522

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