有源先導(dǎo)級控制的電液比例流量閥特性研究
本文關(guān)鍵詞: Valvistor閥 比例流量控制閥 流量補(bǔ)償 靜態(tài)特性 出處:《機(jī)械工程學(xué)報》2016年18期 論文類型:期刊論文
【摘要】:針對現(xiàn)有技術(shù)采用壓差補(bǔ)償器或插裝式流量傳感器控制流量,會降低閥的通流能力,增加系統(tǒng)的功率損失和發(fā)熱;大流量場合只能通過閥開口面積間接控制流量,受負(fù)載變化影響控制精度低;低工作壓力范圍可控性差、動態(tài)響應(yīng)慢;大通徑采用三級結(jié)構(gòu),構(gòu)造復(fù)雜等問題,提出用小功率伺服電動機(jī)驅(qū)動小排量液壓泵/馬達(dá)(有源)、結(jié)合液壓晶體管(Valvistor),構(gòu)造新的低能耗、高可控的電液比例流量閥。該方法可擴(kuò)大閥的流量控制范圍,提高閥在低壓時的動態(tài)響應(yīng)。建立閥的靜態(tài)數(shù)學(xué)模型,分析獲得影響閥負(fù)載流量特性最主要的因素是反饋節(jié)流槽預(yù)開口量大小;進(jìn)一步建立閥的動態(tài)數(shù)學(xué)模型,獲得主閥芯穩(wěn)定條件。根據(jù)閥的結(jié)構(gòu)組成,建立閥的仿真模型,仿真分析主閥各參數(shù)對主閥性能的影響。結(jié)果表明,反饋節(jié)流槽預(yù)開口量越小,主閥負(fù)載流量特性越好;主閥口壓降越大,主閥芯響應(yīng)越快;但由動態(tài)數(shù)學(xué)模型可知主閥口壓降太大且先導(dǎo)流量較小時,閥的穩(wěn)定性也會降低。研究也表明,在保證主閥良好的動態(tài)特性前提下,可通過使先導(dǎo)泵/馬達(dá)轉(zhuǎn)速隨負(fù)載壓力變化,實(shí)現(xiàn)對閥的流量補(bǔ)償,從而改善閥的負(fù)載流量特性。
[Abstract]:According to the prior art, the pressure difference compensator or the plug type flow sensor is used to control the flow, which will reduce the flow capacity of the valve and increase the power loss and heating of the system. In the case of large flow, the flow can only be controlled indirectly through the opening area of the valve, and the control accuracy is low due to the change of load. Low working pressure range is poor controllability, dynamic response is slow; Datong diameter adopts three-level structure and complex structure. A low-power servo motor is used to drive small displacement hydraulic pump / motor (active device, combined with hydraulic transistor). A new electro-hydraulic proportional flow valve with low energy consumption and high control is constructed. This method can enlarge the flow control range of the valve and improve the dynamic response of the valve at low pressure. The static mathematical model of the valve is established. The main factor affecting the load flow characteristics of the valve is the size of the pre-opening of the feedback throttling slot. The dynamic mathematical model of the valve is further established to obtain the stability condition of the main valve core. According to the structure of the valve, the simulation model of the valve is established, and the influence of the main valve parameters on the performance of the main valve is analyzed. The smaller the pre-opening of the feedback throttling slot, the better the load flow characteristics of the main valve. The larger the pressure drop of the main valve, the faster the response of the main valve core; But according to the dynamic mathematical model, the pressure drop of the main valve is too large and the pilot flow is small, the stability of the valve will also be reduced. The study also shows that, under the premise of ensuring the good dynamic characteristics of the main valve. The flow compensation of the valve can be realized by changing the speed of the pilot pump / motor with the load pressure, thus improving the load flow characteristics of the valve.
【作者單位】: 太原理工大學(xué)新型傳感器與智能控制教育部/山西省重點(diǎn)實(shí)驗(yàn)室;
【基金】:國家自然科學(xué)基金資助項(xiàng)目(51175356)
【分類號】:TH137.52
【正文快照】: 0前言*連續(xù)控制流量,可采用比例節(jié)流閥和比例流量閥,比例節(jié)流閥是基礎(chǔ),在此基礎(chǔ)上增設(shè)壓差補(bǔ)償器或流量傳感器,消除壓差變化的影響,就構(gòu)成比例流量閥。國內(nèi)外學(xué)者均對比例節(jié)流閥進(jìn)行了分析研究,OPENBOSCH等[1]通過分析雙向錐閥的機(jī)械、液壓、電磁系統(tǒng),建立了雙向錐閥的動態(tài)數(shù)
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