【摘要】：齒輪泵的輕量化和流量脈動的最小化是齒輪泵的兩個主要研究問題。本文以CBF-E型齒輪泵為研究對象，，應用現(xiàn)代設(shè)計方法對齒輪泵進行了輕量化設(shè)計，通過對齒輪泵的流量脈動及計算流體仿真軟件的流場模擬技術(shù)的深入研究，分析模擬齒輪泵主要設(shè)計參數(shù)對齒輪泵流動特性的影響。本文的主要內(nèi)容包括： (1)從齒輪泵的工作原理出發(fā)，簡要闡述了齒輪泵的主要結(jié)構(gòu)參數(shù)的計算方法以及在正常的工況下這些值的許用范圍，并以此為基礎(chǔ)建立了數(shù)學模型； (2)面向齒輪泵的空間最小體積，在模數(shù)選定的情況下求解已經(jīng)建立的數(shù)學模型。得到不同的模數(shù)對應的最優(yōu)參數(shù)。形成三種備選方案； (3)對齒輪泵的流量脈動進行分析與研究，包括以下內(nèi)容： 1)從理論上推導了瞬時流量脈動、最大瞬時流量、最小瞬時流量以及流量不均勻系數(shù)的計算方法； 2)通過設(shè)計四組試驗，選用18種不同結(jié)構(gòu)參數(shù)的齒輪泵，計算了不同結(jié)構(gòu)參數(shù)齒輪泵的出口瞬時流量，繪制出出口處的流量脈動曲線圖，分析了齒輪泵的齒數(shù)、模數(shù)、壓力角及重疊系數(shù)對齒輪泵輸出流量脈動的影響； 3)應用以上四組試驗分析得到的結(jié)論，對三個面向輕量化的齒輪泵備選方案的出口流量脈動特性進行分析，綜合比較三種備選方案的流量脈動特性，最終確定出流量脈動特性最佳的設(shè)計方案。 (4)基于計算流體力學(CFD)軟件對齒輪泵內(nèi)部流場進行數(shù)值模擬。包括以下內(nèi)容： 1)在齒輪泵的內(nèi)部流場的分析中采用動網(wǎng)格技術(shù)以分析齒輪泵內(nèi)部流場隨齒輪軸轉(zhuǎn)角發(fā)生變化的規(guī)律； 2)基于fluent對齒輪泵的內(nèi)部流場進行數(shù)值模擬。通過對三種備選方案分別進行壓力場，速度場及齒間和進出口處流線的分布狀態(tài)的仿真分析，得出不同設(shè)計方案的流場特性，為方案選擇提供支持。 論文的工作對基于現(xiàn)代設(shè)計方法實現(xiàn)齒輪泵的優(yōu)化設(shè)計提供了參考。
[Abstract]:The lightweight of gear pump and the minimization of flow pulsation are two main research problems of gear pump. In this paper, CBF-E gear pump is taken as the research object, and the lightweight design of gear pump is carried out by using modern design method. The flow pulsation of gear pump and the flow field simulation technology of computational fluid simulation software are deeply studied. The influence of the main design parameters of the simulated gear pump on the flow characteristics of the gear pump is analyzed. The main contents of this paper are as follows: (1) based on the working principle of gear pump, the calculation method of main structural parameters of gear pump and the allowable range of these values under normal working conditions are briefly described. On this basis, the mathematical model is established. (2) the space minimum volume of gear pump is used to solve the established mathematical model under the condition of modulus selection. The optimal parameters corresponding to different modulus are obtained. Forming three options; (3) the flow pulsation of gear pump is analyzed and studied, including the following contents: 1) the calculation methods of instantaneous flow pulsation, maximum instantaneous flow, minimum instantaneous flow and non-uniform coefficient of flow are derived theoretically; 2) through the design of four groups of tests, 18 kinds of gear pump with different structure parameters are selected, the instantaneous flow rate of gear pump with different structure parameters is calculated, the flow pulsation curve at the outlet is drawn, and the tooth number and modulus of gear pump are analyzed. The influence of pressure angle and overlap coefficient on the pulsation of output flow of gear pump; 3) based on the conclusion of the above four sets of experiments, the flow pulsation characteristics of the three gear pump options for lightweight are analyzed, and the flow pulsation characteristics of the three schemes are compared synthetically. Finally, the optimal design scheme of flow pulsation characteristic is determined. (4) numerical simulation of internal flow field of gear pump based on computational fluid dynamics (CFD) software. The main contents are as follows: 1) in the analysis of the internal flow field of gear pump, the dynamic grid technique is used to analyze the law of the change of the internal flow field with the angle of gear shaft; 2) numerical simulation of internal flow field of gear pump based on fluent. Through the simulation and analysis of the pressure field, velocity field and the distribution of flow lines between teeth and inlet and outlet, the flow field characteristics of different design schemes are obtained, which provide support for the scheme selection. The work of this paper provides a reference for the optimization design of gear pump based on modern design method.
【學位授予單位】：天津理工大學
【學位級別】：碩士
【學位授予年份】：2012
【分類號】：TH325

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