本文選題：旋轉(zhuǎn)唇形油封 + 泵汲率��； 參考：《重慶大學(xué)》2014年碩士論文

【摘要】：目前國(guó)內(nèi)旋轉(zhuǎn)唇形油封的設(shè)計(jì)，主要采用傳統(tǒng)的經(jīng)驗(yàn)設(shè)計(jì)和粗略宏觀分析的方式，油封的密封性能在生產(chǎn)出來之前不可預(yù)見，只能通過實(shí)驗(yàn)判斷產(chǎn)品合格與否，既費(fèi)時(shí)又費(fèi)力。人們對(duì)油封的研究不少，，但很少研究油封結(jié)構(gòu)參數(shù)對(duì)油封密封性能和散熱的影響。本文針對(duì)這一研究現(xiàn)狀，利用有限元軟件建立安裝后旋轉(zhuǎn)唇形油封的二維軸對(duì)稱模型，得到油封唇口接觸寬度和接觸壓力分布，并結(jié)合理論分析的結(jié)果，分析重要參數(shù)對(duì)油封泵汲率和生熱量的影響；在此基礎(chǔ)上利用CFD軟件建立旋轉(zhuǎn)軸和油封唇口潤(rùn)滑油的二維軸對(duì)稱模型，分析重要參數(shù)對(duì)油封唇口溫度分布的影響。 有限元模擬和理論分析結(jié)果表明，油封唇口柯西應(yīng)力和接觸壓力最大處位于油封唇尖；由油封唇尖往空氣側(cè)和油側(cè)，柯西應(yīng)力和接觸壓力減少很快。隨過盈量的增大，油封唇口的接觸寬度、泵汲率和生熱量均增加，而油封唇口最大接觸壓力先增加后減少。不同彈簧勁度系數(shù)下，油封唇口有相似的壓力分布；彈簧勁度系數(shù)的增大，使得油封簧后內(nèi)徑減少；其對(duì)油封生熱量影響很大，而對(duì)泵汲率影響較小。彈簧中心與油封唇尖的軸向距離增大后，油封唇口接觸寬度和生熱量減少，而油封泵汲率則增加。隨空氣側(cè)唇角的增加，油封唇口接觸寬度和泵汲率均減少，而生熱量則緩慢增加。油封唇口的生熱量和泵汲率都隨軸轉(zhuǎn)速的增加而快速增加。 CFD模擬結(jié)果表明，旋轉(zhuǎn)唇形油封工作過程中溫度最高處集中在油封唇口，由唇口摩擦面到軸中心溫度逐漸降低；油封唇口的溫度最高，從唇口往兩側(cè)溫度逐漸降低；軸的溫度高于潤(rùn)滑油的溫度，空氣側(cè)的溫度要高于潤(rùn)滑油側(cè)的溫度。在軸轉(zhuǎn)速不變的情況下，油封唇口摩擦面最高溫度隨過盈量、彈簧勁度系數(shù)增加而增加，而隨空氣側(cè)唇角的增加緩慢減少；在其它條件不變的情況下，油封唇口的摩擦面最高溫度隨軸轉(zhuǎn)速的增加幾乎呈線性增加。
[Abstract]:At present, the domestic rotary lip seal design mainly adopts the traditional experience design and the rough macroscopic analysis way, the seal performance of the oil seal can not be predicted before the production, can only judge whether the product is qualified or not through the experiment, which is time-consuming and laborious. Many researches have been done on oil seal, but the influence of structure parameters on seal performance and heat dissipation has been seldom studied. In this paper, a two-dimensional axisymmetric model of rotating lip seal after installation is established by using finite element software. The contact width and contact pressure distribution are obtained, and the results of theoretical analysis are combined. Based on the analysis of the influence of important parameters on the swabbing rate and heat generation of the oil seal pump, a two-dimensional axisymmetric model of rotary shaft and oil seal lip lubricating oil was established by using CFD software, and the influence of important parameters on the temperature distribution of the oil seal lip was analyzed. The results of finite element simulation and theoretical analysis show that the maximum Cauchy stress and contact pressure are located at the tip of the oil seal, and the Cauchy stress and contact pressure decrease rapidly from the tip of the oil seal to the air side and the oil side. With the increase of interference volume, the contact width, pump swabbing rate and heat generation of the oil seal lip increase, while the maximum contact pressure of the oil seal lip increases first and then decreases. Under different spring stiffness coefficient, the oil seal lip has similar pressure distribution; the increase of spring stiffness coefficient reduces the inner diameter of oil seal spring; it has a great effect on the heat generation of oil seal, but has little effect on pump swabbing rate. When the axial distance between the spring center and the oil seal lip tip increases, the contact width and heat generation of the oil seal lip decrease, while the oil seal pump swabbing rate increases. With the increase of the air side lip angle, the contact width and pump swabbing rate of the oil seal lip decrease, while the heat generation increases slowly. The heat generation and pump swabbing rate of oil seal lip increased rapidly with the increase of shaft speed. CFD simulation results show that the highest temperature is concentrated on the lip of the rotary lip seal, and the temperature from the lip friction surface to the center of the shaft decreases gradually, the temperature of the oil seal lip is the highest, and the temperature from the lip to the two sides decreases gradually. The temperature of the shaft is higher than the temperature of the lubricating oil, and the temperature of the air side is higher than the temperature of the lubricating oil side. Under the condition of constant axial speed, the maximum temperature of the friction surface of the oil seal lip increases with the interference, the spring stiffness coefficient increases, but decreases slowly with the increase of the air side lip angle. The maximum temperature of friction surface of oil seal lip increases linearly with the increase of axial speed.
【學(xué)位授予單位】：重慶大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2014
【分類號(hào)】：TH38

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