有源先导级控制的电液比例流量阀特性研究

发布时间：2018-01-28 21:30

本文关键词： Valvistor阀比例流量控制阀流量补偿静态特性　出处：《机械工程学报》2016年18期 　论文类型：期刊论文

【摘要】：针对现有技术采用压差补偿器或插装式流量传感器控制流量,会降低阀的通流能力,增加系统的功率损失和发热;大流量场合只能通过阀开口面积间接控制流量,受负载变化影响控制精度低;低工作压力范围可控性差、动态响应慢;大通径采用三级结构,构造复杂等问题,提出用小功率伺服电动机驱动小排量液压泵/马达(有源)、结合液压晶体管(Valvistor),构造新的低能耗、高可控的电液比例流量阀。该方法可扩大阀的流量控制范围,提高阀在低压时的动态响应。建立阀的静态数学模型,分析获得影响阀负载流量特性最主要的因素是反馈节流槽预开口量大小;进一步建立阀的动态数学模型,获得主阀芯稳定条件。根据阀的结构组成,建立阀的仿真模型,仿真分析主阀各参数对主阀性能的影响。结果表明,反馈节流槽预开口量越小,主阀负载流量特性越好;主阀口压降越大,主阀芯响应越快;但由动态数学模型可知主阀口压降太大且先导流量较小时,阀的稳定性也会降低。研究也表明,在保证主阀良好的动态特性前提下,可通过使先导泵/马达转速随负载压力变化,实现对阀的流量补偿,从而改善阀的负载流量特性。
[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.
【作者单位】：太原理工大学新型传感器与智能控制教育部/山西省重点实验室;
【基金】：国家自然科学基金资助项目(51175356)
【分类号】：TH137.52
【正文快照】： 0前言*连续控制流量,可采用比例节流阀和比例流量阀,比例节流阀是基础,在此基础上增设压差补偿器或流量传感器,消除压差变化的影响,就构成比例流量阀。国内外学者均对比例节流阀进行了分析研究,OPENBOSCH等[1]通过分析双向锥阀的机械、液压、电磁系统,建立了双向锥阀的动态数

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