發(fā)布時間：2019-04-24 03:14

【摘要】：內(nèi)嚙合齒輪泵具有結(jié)構(gòu)緊湊、運轉(zhuǎn)平穩(wěn)、壓力高、噪聲低、無困油、自吸性好、轉(zhuǎn)速范圍廣等突出優(yōu)點而被廣泛用于各類工程機械。而高壓化是內(nèi)嚙合齒輪泵發(fā)展趨勢。但隨著壓力增加，將導(dǎo)致零件之間摩擦發(fā)熱、油液泄漏及零件的變形量增加。本文對影響內(nèi)嚙合齒輪泵高壓化的關(guān)鍵技術(shù)問題進行了分析研究。 內(nèi)嚙合齒輪泵中的內(nèi)齒輪受到高壓油的液壓力和齒輪嚙合力的作用，內(nèi)齒輪外壁對泵體產(chǎn)生較大壓力，增加了內(nèi)齒輪與泵體內(nèi)壁之間的摩擦,使內(nèi)齒輪與泵體發(fā)生膠合失效。本文運用靜壓支撐理論，通過對內(nèi)齒輪及泵體的受力理論分析及FLUENT數(shù)值模擬，，得到使內(nèi)齒輪達到受力平衡的靜壓支撐槽的位置及角度等關(guān)鍵參數(shù)，根據(jù)參數(shù)進行樣機實驗，實驗結(jié)果驗證了其可行性。 內(nèi)齒輪泵在高壓情況下齒輪的徑向端面和軸向端面都會出現(xiàn)較大泄漏。為減少高壓內(nèi)嚙合齒輪泵徑向泄漏量，需進行徑向補償。通過對月牙塊受力隨齒輪轉(zhuǎn)動角度變化作動態(tài)分析，優(yōu)化得到使用于徑向補償?shù)纳舷聝稍卵缐K分別貼緊內(nèi)外齒輪齒頂形成徑向密封的情況下，上下月牙塊對內(nèi)外齒輪壓力最小的上下月牙塊高壓區(qū)端面角度和密封小棒安裝角度等參數(shù)。 軸向泄漏采用浮動側(cè)板進行軸向補償。而浮動側(cè)板兩側(cè)受到的壓油腔內(nèi)高壓油和背壓室高壓油對其作用力的力矩不平衡，浮動側(cè)板由此將發(fā)生歪斜、側(cè)翻，加劇齒輪泵齒輪軸向端面與浮動側(cè)板間磨損，從而降低齒輪泵的壽命。此外，浮動側(cè)板兩側(cè)的作用力將決定浮動側(cè)板與外齒輪和內(nèi)齒輪間的軸向間隙和由其產(chǎn)生的泄漏，直接影響泵的容積效率。本文通過計算得到使浮動側(cè)板所受軸向力和力矩平衡的背壓室邊界極角和背壓室邊界內(nèi)外圓半徑。 內(nèi)嚙合齒輪泵內(nèi)部零件之間有配合間隙，在高壓條件下，流體由此產(chǎn)生泄漏，并且對與之接觸的零件表面產(chǎn)生流體摩擦阻力，流體泄漏量和流體摩擦阻力都與零件表面粗糙度相關(guān)。通過分析粗糙度對流體泄漏和摩擦阻力的影響，得到使流體在兩表面之間泄漏量、流體摩擦阻力最小的最優(yōu)粗糙度。 高壓油對外齒輪徑向齒面的油壓力會使外齒輪產(chǎn)生變形，影響外齒輪尺寸，對內(nèi)嚙合齒輪泵的流量產(chǎn)生影響。通過計算外齒輪由高壓油產(chǎn)生的變形量，將外齒輪段撓度變形看做外齒輪產(chǎn)生的變位系數(shù)，得到外齒輪撓度變形前后齒輪泵流量之差。
[Abstract]:With the advantages of compact structure, stable operation, high pressure, low noise, no oil trap, good self-priming and wide rotating speed range, internal meshing gear pump is widely used in all kinds of construction machinery. High pressure is the development trend of internal meshing gear pump. However, with the increase of pressure, friction heat between parts, oil leakage and deformation of parts will increase. In this paper, the key technical problems affecting the high pressure of internal meshing gear pump are analyzed and studied. The inner gear in the internal gear pump is affected by the hydraulic pressure of the high pressure oil and the meshing force of the gear. The inner gear and the outer wall of the pump produce a greater pressure on the pump body, which increases the friction between the inner gear and the pump body, and makes the internal gear and the pump body glued to failure. Based on the theory of static pressure support and the theoretical analysis of internal gear and pump body and the numerical simulation of FLUENT, the key parameters such as the position and angle of static pressure support groove to achieve the force balance of internal gear are obtained in this paper, and the prototype experiment is carried out according to the parameters. The experimental results show that this method is feasible. Under high pressure, both radial and axial end faces of the inner gear pump will appear large leakage. In order to reduce the radial leakage of high pressure internal meshing gear pump, radial compensation should be carried out. Based on the dynamic analysis of the force of the crescent mass with the rotation angle of the gear, the radial seal is obtained when the upper and lower two-month pieces used for radial compensation are respectively attached to the top of the inner and outer gears to form a radial seal. The upper and lower crescent mass has the lowest pressure on the inner and outer gears, such as the end angle of the high pressure area of the upper and lower crescent mass and the installation angle of the sealing rod. Axial leakage is compensated by floating side plate. On both sides of the floating side plate, the torque of the high pressure oil in the pressure chamber and the high pressure oil in the back pressure chamber is unbalanced, so the floating side plate will be skewed and turned over, which aggravates the wear between the axial face of the gear pump gear and the floating side plate. Thus reducing the life of gear pump. In addition, the force on both sides of the floating side plate will determine the axial clearance between the floating side plate and the outer gear and the inner gear, and the leakage will directly affect the volume efficiency of the pump. In this paper, the polar angle of the back pressure chamber boundary and the radius of the inner and outer circles of the back pressure chamber boundary to balance the axial force and torque of the floating side plate are obtained by calculation. There is a fit gap between the internal parts of the internal meshing gear pump. Under high pressure conditions, the fluid leakage occurs and a fluid friction resistance is produced on the surface of the part with which it is in contact. The fluid leakage and friction resistance are related to the surface roughness of the parts. By analyzing the influence of roughness on fluid leakage and friction resistance, the optimum roughness is obtained, which makes the fluid leak between two surfaces and the friction resistance of fluid is minimized. The oil pressure of high pressure oil on the radial tooth surface of the outer gear causes the deformation of the outer gear, affects the size of the outer gear, and affects the flow rate of the internal meshing gear pump. By calculating the deformation of the outer gear caused by the high pressure oil, the deflection of the outer gear segment is regarded as the displacement coefficient of the outer gear, and the difference of the flow rate of the gear pump before and after the deflection deformation of the outer gear is obtained.
【學(xué)位授予單位】：遼寧工程技術(shù)大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2012
【分類號】：TH325

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