本文選題：液壓閥 + 節(jié)流溫升　； 參考：《蘭州理工大學(xué)》2011年碩士論文

【摘要】：液壓系統(tǒng)中,液壓閥控制著系統(tǒng)中液流的壓力、流量和方向,因此液壓閥的性能對整個系統(tǒng)的性能起著至關(guān)重要的作用。液壓滑閥和錐閥是常用的兩種閥結(jié)構(gòu),由于滑閥閥芯、閥套(或閥體)間配合間隙較小,其在使用過程中常出現(xiàn)卡滯、卡死、磨損、泄漏等問題。本文采用了理論分析和數(shù)值仿真相結(jié)合的研究方法,針對液壓閥內(nèi)因節(jié)流而產(chǎn)生的油液和閥內(nèi)溫度變化所導(dǎo)致的閥特性的改變進行了深入的研究,計算結(jié)果表明:節(jié)流作用使得與固體接觸的油液和固體部分溫度較高,閥口形式對溫升影響較大;閥芯、閥體內(nèi)溫度分布不均勻、不對稱;閥芯、閥體受節(jié)流溫升影響局部變形較大。 主要內(nèi)容如下: 第1章,闡述了本課題研究的背景和意義;概述了國內(nèi)外關(guān)于液壓閥內(nèi)溫度場、閥結(jié)構(gòu)受熱形變的研究現(xiàn)狀和存在的問題;概括了本文的主要研究內(nèi)容。 第2章,分析了流體溫升理論,對液壓系統(tǒng)中溫升的主要來源進行了討論;討論了材料和零件隨溫度變化的變化情況。 第3章,利用CFD軟件FLUENT對滑閥、錐閥、阻尼孔內(nèi)流場和溫度場進行了分析,得到了閥內(nèi)部壓力、速度和溫度隨閥口形式、開口量和進出口壓差變化的分布情況。計算結(jié)果表明,閥內(nèi)液流的溫度分布不均勻,閥口流束與固體壁面接近的流體區(qū)域溫度較高,流束中心部位溫度較低,最高溫度出現(xiàn)在最靠近流束的壁面區(qū)域,節(jié)流口后部出現(xiàn)漩渦的流體溫度有所升高;這表明流體溫度升高主要是由于閥口處的高速流體與壁面及其周邊低速流體摩擦產(chǎn)生熱量和漩渦的粘性耗散所致。 第4章,有限元分析軟件ANSYS將第三章分析的溫度邊界結(jié)果加載到對應(yīng)的閥芯、閥體中,對閥芯和閥體的熱變形進行有限元分析。計算結(jié)果顯示:閥體和閥芯的溫度分布不均勻、不對稱,閥口區(qū)域和流束在閥腔內(nèi)沖擊到的固體壁面有局部高溫;節(jié)流槽形狀和閥口開度對閥內(nèi)溫度分布有較大影響,閥芯和閥體的熱變形主要表現(xiàn)為閥芯局部直徑變大、閥體孔局部變小,變形量可達數(shù)微米,并伴有彎曲變形現(xiàn)象.上述變形可能導(dǎo)致閥芯卡緊。 最后,對本論文的研究工作和成果進行了總結(jié),展望了下一步的研究工作。
[Abstract]:In the hydraulic system, the hydraulic valve controls the pressure, flow and direction of the fluid flow in the system, so the performance of the hydraulic valve plays an important role in the performance of the whole system. Hydraulic slide valve and cone valve are two commonly used valve structures. Due to the small gap between the valve core and valve sleeve (or valve body), the hydraulic slide valve and the cone valve often appear some problems in the process of application, such as sticking, wearing, leaking and so on. In this paper, the theoretical analysis and numerical simulation are used to study the change of valve characteristics caused by the change of oil and temperature in hydraulic valve due to throttling. The results show that throttling makes the temperature of oil and solid parts in contact with solids higher, and the form of valve port has a great influence on temperature rise; the valve core, the temperature distribution in the valve body is uneven and asymmetrical, the valve core, the valve core, the valve core, the valve core, the valve core, the valve core, The valve body is affected by throttle temperature rise in local deformation. The main contents are as follows: In chapter 1, the background and significance of the research are described, the research status and existing problems of the temperature field in the hydraulic valve and the thermal deformation of the valve structure at home and abroad are summarized, and the main research contents of this paper are summarized. In chapter 2, the theory of fluid temperature rise is analyzed, the main sources of temperature rise in hydraulic system are discussed, and the variation of materials and parts with temperature is discussed. In chapter 3, the internal flow field and temperature field of slide valve, cone valve and damping hole are analyzed by CFD software FLUENT, and the distribution of internal pressure, velocity and temperature of valve with valve form, opening quantity and inlet and outlet pressure difference is obtained. The results show that the temperature distribution of the liquid flow in the valve is not uniform, the temperature of the flow zone near the solid wall is higher, the temperature of the central part of the flow beam is lower, and the highest temperature appears in the wall region closest to the flow beam. The temperature of the fluid at the back of the throttle is increased, which indicates that the increase of fluid temperature is mainly caused by the friction between the high velocity fluid at the orifice and the low velocity fluid on the wall and the surrounding low speed fluid, which results in the heat and viscous dissipation of the swirl. In chapter 4, the finite element analysis software ANSYS loads the temperature boundary results of the third chapter into the corresponding spool and body. The thermal deformation of the spool and valve body is analyzed by finite element method. The results show that the temperature distribution of the valve body and the valve core is uneven and asymmetrical, and there is local high temperature in the solid wall impacted by the orifice region and the flow beam in the valve chamber, and the shape of throttle and the opening degree of valve opening have great influence on the temperature distribution in the valve. The hot deformation of the spool and the valve body mainly shows that the local diameter of the valve core becomes larger, the hole of the valve body becomes smaller, the deformation amount can reach several microns, and the deformation phenomenon is accompanied by bending. The above deformation may cause the spool to tighten. Finally, the research work and results of this paper are summarized, and the next research work is prospected.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級別】：碩士
【學(xué)位授予年份】：2011
【分類號】：TH137.52

【相似文獻】

相關(guān)期刊論文 前10條

1 張國鋒;;“打不還手”是懶于出手還是無能為力?——關(guān)注引起液壓ABS國產(chǎn)化落寞的緣由[J];汽車零部件;2009年09期

2 宋晨霞;胡慶夕;;三坐標測量機在零件自動檢測中的應(yīng)用[J];現(xiàn)代機械;2011年03期

3 張英才;劉一波;;淺談液壓系統(tǒng)的故障分析與防止措施[J];科技信息;2011年21期

4 ;用于城市環(huán)保公交車的液壓閥和智能變速器[J];現(xiàn)代制造;2010年21期

5 張林;白忠飛;李春林;;套管工位間傳輸系統(tǒng)設(shè)計[J];機械工程師;2011年07期

6 Jasmin Müller;Jiri Vondricka;;[液壓]實現(xiàn)快速調(diào)節(jié)[J];現(xiàn)代制造;2010年48期

7 孫余凱;吳鳴山;項綺明;;帕薩特B5系列轎車制動防抱死系統(tǒng)的組成與原理(下)[J];電子世界;2011年06期

8 王洪波;;手動換向閥的故障分析[J];液壓氣動與密封;2011年07期

9 Karl Wartlick;;[液壓]提高液壓設(shè)備的利用率[J];現(xiàn)代制造;2010年48期

10 李惟祥;鄧斌;劉曉紅;;液壓滑閥內(nèi)部溫度特性的研究[J];液壓氣動與密封;2011年07期

相關(guān)會議論文 前10條

1 鄒俊;陸亮;傅新;;液壓閥口氣穴、振動與噪聲研究[A];中國機械工程學(xué)會流體傳動與控制分會第六屆全國流體傳動與控制學(xué)術(shù)會議論文集[C];2010年

2 袁銳波;許茂桃;趙恩剛;邵曉光;;數(shù)字式純水液壓閥的研究[A];慶祝中國力學(xué)學(xué)會成立50周年暨中國力學(xué)學(xué)會學(xué)術(shù)大會’2007論文摘要集（上）[C];2007年

3 朱萬勝;尹玉芳;張作龍;張彥廷;;基于CFD方法的鉆井液錐閥流場模擬及結(jié)構(gòu)分析[A];第五屆全國流體傳動與控制學(xué)術(shù)會議暨2008年中國航空學(xué)會液壓與氣動學(xué)術(shù)會議論文集[C];2008年

4 秦雙迎;黃宜堅;;基于AR雙譜的液壓閥故障診斷[A];第六屆全國信息獲取與處理學(xué)術(shù)會議論文集（2）[C];2008年

5 冀宏;張繼環(huán);王東升;張瑋;劉小平;;滑閥矩形節(jié)流槽閥口的流量系數(shù)[A];中國機械工程學(xué)會流體傳動與控制分會第六屆全國流體傳動與控制學(xué)術(shù)會議論文集[C];2010年

6 王學(xué)珍;程遠;;熱軋液壓系統(tǒng)二次沖洗及設(shè)備單試難點解析[A];全國冶金自動化信息網(wǎng)2011年年會論文集[C];2011年

7 仇宏程;;液壓脈沖發(fā)生器最佳脈沖口的設(shè)計[A];貴州省科學(xué)技術(shù)優(yōu)秀學(xué)術(shù)論文集（2004年度）[C];2004年

8 朱紅巖;張志國;;插裝閥組控制差動液壓缸應(yīng)用分析[A];第五屆全國流體傳動與控制學(xué)術(shù)會議暨2008年中國航空學(xué)會液壓與氣動學(xué)術(shù)會議論文集[C];2008年

9 王立華;;液壓閥輸出速度在楔塊調(diào)整中的作用[A];中國計量協(xié)會冶金分會2009年年會論文集[C];2009年

10 孫春耕;羅t，

本文編號：1845527