【摘要】：斯特林發(fā)動(dòng)機(jī)是一種外部供熱或燃燒的活塞式發(fā)動(dòng)機(jī)，它以氫氣或氦氣為工質(zhì)，采用接觸式密封裝置，按閉式回?zé)嵫h(huán)的方式進(jìn)行工作。理想的斯特林發(fā)動(dòng)機(jī)動(dòng)密封應(yīng)該實(shí)現(xiàn)良好的密封、低功耗及長(zhǎng)壽命，因此提高密封裝置的密封性能并降低密封件的磨損率則成了斯特林發(fā)動(dòng)機(jī)能否向大功率發(fā)展的關(guān)鍵。 本文簡(jiǎn)要介紹了斯特林發(fā)動(dòng)機(jī)基本原理和發(fā)展現(xiàn)狀，闡述了斯特林發(fā)動(dòng)機(jī)活塞桿的密封機(jī)理、摩擦副磨損機(jī)制及典型密封結(jié)構(gòu)。在此基礎(chǔ)上設(shè)計(jì)出符合斯特林發(fā)動(dòng)機(jī)的活塞桿密封結(jié)構(gòu)，即帽式密封加滑動(dòng)密封的組合式密封結(jié)構(gòu)。 本文首先以接觸式密封機(jī)理為基礎(chǔ)，研究影響帽式密封和滑動(dòng)密封的因素，，分別建立壓力、溫度及裝配過(guò)盈量條件下的接觸壓力數(shù)學(xué)模型；其次，以磨損機(jī)制為基礎(chǔ)，研究影響密封件摩擦磨損的因素，建立有油潤(rùn)滑狀態(tài)下的油膜參數(shù)與摩擦系數(shù)、粗糙度與體積磨損量的數(shù)學(xué)模型；再次，搭建了斯特林活塞桿密封試驗(yàn)臺(tái)，用試驗(yàn)方法定量測(cè)量、分析以驗(yàn)證該數(shù)學(xué)模型的正確性和可應(yīng)用性，并找出各工況參數(shù)對(duì)密封件的密封性能及其磨損率的影響規(guī)律；最后，結(jié)合試驗(yàn)分析的結(jié)果，從理論上提出了提高斯特林發(fā)動(dòng)機(jī)活塞桿密封件的密封性能和減緩其摩擦磨損的方法，并對(duì)未來(lái)斯特林發(fā)動(dòng)機(jī)密封裝置的發(fā)展提出了展望。
[Abstract]:Stirling engine is a kind of piston engine with external heating or combustion. It uses hydrogen or helium as working fluid, adopts contact sealing device, and works according to closed regenerative cycle. The ideal dynamic seal of Stirling engine should achieve good sealing, low power consumption and long life. Therefore, improving the sealing performance of the sealing device and reducing the wear rate of sealing parts are the key to the development of Stirling engine to high power. In this paper, the basic principle and development status of Stirling engine are briefly introduced, and the sealing mechanism of piston rod, wear mechanism of friction pair and typical sealing structure of Stirling engine are expounded. On this basis, the piston rod seal structure which accords with Stirling engine is designed, that is, the combined seal structure of cap seal and sliding seal. In this paper, based on the contact seal mechanism, the factors influencing the cap seal and sliding seal are studied, and the mathematical models of contact pressure under the conditions of pressure, temperature and assembly interference are established, and the wear mechanism is used as the foundation. The factors that affect the friction and wear of sealing parts are studied, and the mathematical models of oil film parameters and friction coefficient, roughness and volume wear under the condition of oil lubrication are established. Thirdly, the Stirling piston rod seal test bench is built. Quantitative measurement is used to verify the correctness and applicability of the mathematical model, and the influence of working conditions on the sealing performance and wear rate of the seal is found out. In this paper, a method to improve the sealing performance of piston rod seal of Stirling engine and to reduce its friction and wear is put forward theoretically, and the prospect of the development of Stirling engine seal device in the future is put forward.
【學(xué)位授予單位】：蘭州理工大學(xué)
【學(xué)位級(jí)別】：碩士
【學(xué)位授予年份】：2012
【分類號(hào)】：TH136

【引證文獻(xiàn)】

相關(guān)碩士學(xué)位論文 前1條

1 鄒城;小型斯特林發(fā)動(dòng)機(jī)換熱系統(tǒng)的研究[D];廣東工業(yè)大學(xué);2013年

本文編號(hào)：2190325