本文關鍵詞：多聯(lián)轉子液壓泵設計及特性研究　出處：《中國農(nóng)業(yè)大學》2017年博士論文　論文類型：學位論文

  更多相關文章： 并聯(lián)齒輪泵 瞬時同步 并聯(lián)同步分流器 同步變量控制 同步恒流控制

【摘要】：很多現(xiàn)代化智能機械在作業(yè)過程中,要求多個執(zhí)行機構同步動作,液壓同步控制的精度尤其高速動作時的同步精度問題是這些系統(tǒng)研究的難點問題。目前常用的同步控制方式各有利弊,對于終端執(zhí)行件較多的同步液壓系統(tǒng),研究具有多個工作單元組成、故障率低的多聯(lián)轉子泵,對降低控制難度和成本、提高液壓系統(tǒng)控制精度有重要的實際意義和應用價值。本文提出并聯(lián)轉子液壓泵流量脈動瞬時同步原理,將并聯(lián)轉子液壓泵分為并聯(lián)凸輪泵、并聯(lián)齒輪泵兩類,對并聯(lián)齒輪泵進行了重點研究。根據(jù)并聯(lián)齒輪泵的工作狀態(tài)將其作為同步泵和同步分流器應用,研究其流量特性,在此基礎上進行參數(shù)設計和特性研究,研制了試驗樣機,完成并聯(lián)齒輪泵的變量控制試驗和并聯(lián)同步分流器的恒流控制試驗。(1)研究并聯(lián)轉子泵流量脈動瞬時同步原理,根據(jù)中心轉子齒數(shù)與行星轉子均布個數(shù)的關系及特征,并聯(lián)轉子泵分為三類:Ⅰ類泵可實現(xiàn)各工作單元流量脈動瞬時同步,Ⅱ類泵可實現(xiàn)組內各工作單元流量脈動瞬時同步,組間獨立控制,Ⅲ類泵各工作單元的瞬時狀態(tài)均不同,為平均同步。(2)研究三類并聯(lián)齒輪泵的流量特性。通過分析三類泵的中心輪與行星輪嚙合點位置和軌跡,運用有限體積法得到了各工作單元的瞬時流量和理論排量方程。分析了困油對并聯(lián)齒輪泵的影響,開卸荷槽消除困油能夠有效提升容積效率,且中心輪齒數(shù)越多,效果越明顯。(3)對并聯(lián)齒輪泵進行設計。運用縫隙流動理論,建立徑向泄露和端面泄漏的數(shù)學模型,結合ANSYS軟件的流體分析模塊,分析并聯(lián)齒輪泵處于泵工作狀態(tài)時各因素對泄漏量和容積效率的影響規(guī)律,以此為依據(jù)對中心輪齒數(shù)、徑向間隙、端面間隙、行星輪齒數(shù)等關鍵設計參數(shù)進行了確定。合理選擇中心輪齒數(shù),采用中心輪齒頂間隙大于行星輪齒頂間隙的設計方法,可使性能達到或高于普通齒輪泵。(4)仿真試驗研究并聯(lián)齒輪泵的特性。Ⅰ、Ⅱ、Ⅲ類并聯(lián)齒輪泵的共有特性是,隨著出口壓力增高,流速線性降低,瞬時流速曲線局部出現(xiàn)波動的幅度增大,局部波動在時間軸的位置呈現(xiàn)周期性。各工作單元的出口流速只與該單元的出口壓力有關,與其它工作單元無關。通過調速電機控制齒輪轉速,可實現(xiàn)各工作單元的同步變量控制。(5)對并聯(lián)同步分流器進行設計和特性研究。并聯(lián)同步分流器是Ⅰ類并聯(lián)齒輪泵作為分流器的應用,各分流單元的工作狀態(tài)瞬時同步,其工作條件是N個行星輪均布,且中心輪齒數(shù)能被N整除。分析各因素對泄漏量和容積效率的影響規(guī)律,對各關鍵設計參數(shù)進行了確定。并聯(lián)齒輪泵作為同步分流器使用比作為同步泵使用容積效率高。負載壓力不變時,平均流量隨著齒輪轉速降低線性減小,由伺服電機調整中心輪轉速實現(xiàn)同步變量控制;負載壓力變化時,平均流速隨著負載壓力的變化同向線性變化,由伺服電機提升或降低中心輪轉速,實現(xiàn)同步恒流控制。(6)研制了三聯(lián)齒輪泵樣機,完成了并聯(lián)齒輪泵的變量控制試驗和并聯(lián)同步分流器的恒流控制試驗,對試驗結果進行了分析,針對試驗中出現(xiàn)的泄漏量大和三個出口流量差距的問題進行了剖析,提出了解決方法。
[Abstract]:Many modern intelligent machinery in the operation process, requirements for synchronous action of multiple actuators, hydraulic synchronous control precision and the synchronization precision at high speed operation is a difficult problem to the system. The synchronous control methods used have advantages and disadvantages, for the synchronous hydraulic system terminal actuator more research, with multiple units of work composed of multi rotor pump with low failure rate, to reduce the difficulty and cost control, improve has important practical significance and application value to control precision of the hydraulic system. In this paper, the instantaneous flow pulsation of hydraulic pump rotor synchronous parallel principle, the parallel hydraulic pump rotor is divided into parallel cam pump, parallel gear pump two kinds of parallel gear the pump is studied. According to the working state of the parallel gear pump as the synchronous pump and synchronous shunt application, study on the flow characteristics, on this basis Study on parameter design and characteristics, developed prototype, constant current control test variable control experiment and parallel synchronous shunt complete parallel gear pump. (1) research on parallel rotor pump instantaneous synchronization principle, and according to the characteristics of the center number of rotor teeth and planetary rotor uniform number, parallel rotor pump three types: the first type of pump can be achieved by the unit of work flow pulsation instantaneous synchronization, class II pump can achieve synchronization within the group unit of work flow pulsation instantaneous, groups of independent control, the instantaneous state of each pump unit class work are different, for the average synchronization. (2) the flow characteristics of three types of parallel gear pump through the analysis of three types of pumps. The center gear and planetary gear meshing point and trajectory, using the finite volume method of each work unit instantaneous flow and theoretical displacement equations. Analysis of the impact of trapped oil on parallel gear pump, open the discharge To eliminate the trapped oil groove can effectively improve the volumetric efficiency, and the center of the tooth number, the more obvious effects. (3) the design of parallel gear pump. By using the theory of gap flow, establish the mathematical model of radial leakage and surface leakage, combining the fluid analysis module of ANSYS software, analysis of parallel gear pump in the pump work when the influence of leakage and volume efficiency, on the basis of central gear, radial clearance, clearance, key design parameters of planetary gear type were determined. The reasonable selection of central gear, the design method of tooth tip clearance is greater than the heart of planet gear tip clearance, can make the performance at or above the common gear pump. (4) simulation experimental study of parallel gear pump. I, II, III class of parallel gear pump has characteristics, as exports increased pressure, flow rate decreased, the instantaneous velocity curve The fluctuation amplitude increases, the local fluctuation is periodic in the time axis. The position of each unit of work is only related with the exit velocity of the unit outlet pressure, but not with other work units. Through the speed motor control gear speed, synchronous variable control can realize each unit of work. (5) studied the design and characteristics of parallel synchronous shunt. Parallel synchronous shunt I parallel gear pump as the shunt application, the working state of the instantaneous shunt unit synchronization, its working condition is N planetary gear uniform, and the center of the tooth number is divisible by N. Analysis of the influences of the leakage and the volumetric efficiency of the key design. The parameters are determined. The parallel gear pump as synchronous shunt than as synchronous pump with high volumetric efficiency. The load pressure is constant, the average flow speed decreases linearly decreases with the gear, by Adjust the center wheel speed servo motor synchronization control of variable load; when the pressure changes, the average flow rate with the same to the linear change of load pressure, by the servo motor to enhance or reduce the center wheel speed, to achieve synchronization of constant current control. (6) developed a triple gear pump prototype, the constant current control variable control experiment and test parallel synchronous shunt parallel gear pump, the test results are analyzed, according to the amount of leakage occurred and three outlet flow gap problems are analyzed and solutions are put forward.

【學位授予單位】：中國農(nóng)業(yè)大學
【學位級別】：博士
【學位授予年份】：2017
【分類號】：TH137.51

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本文編號：1374135