【摘要】：超高壓節(jié)流閥是高壓、高產(chǎn)氣田生產(chǎn)過程中不可缺少的設備之一,同時,其密封性能決定著產(chǎn)品的質(zhì)量,也是節(jié)流閥安全運行的保證,況且節(jié)流閥密封件是不可重復使用的易耗品,一直以來都是國外廠家的技術(shù),對產(chǎn)品進行了完全壟斷。本文研究的泛塞封為某氣田某節(jié)流閥上的動密封裝置。泛塞封的主要結(jié)構(gòu)由高性能的彈簧以及高分子材料的密封圈組成。對該類型的密封圈在不同工作狀態(tài)下進行有限元模擬分析,研究其密封性能,可以提高密封的可靠性,為設計提供依據(jù),擴大其運用的領域,具有重要的意義。 本文從密封原理和密封材料入手,分析了流體靜、動壓密封機理。對三種不同改性材料進行了拉伸、壓縮試驗,獲得了材料的力學性能參數(shù)。為泛塞封建立了有限元計算模型,對泛塞封在靜止工作狀態(tài)下進行數(shù)值模擬研究,分析了泛塞封在安裝后和施加超高壓(105MPa)后應力和應變的分布。得到了靜密封狀態(tài)下的接觸應力和接觸寬度的分布規(guī)律。分析了壓縮量和工作壓力對泛塞封靜密封密封性能的影響規(guī)律。 影響泛塞封動密封的主要因素是工況參數(shù)以及密封件的結(jié)構(gòu)參數(shù),本文對泛塞封使用過程中軸的運動速度、接觸面的摩擦系數(shù)、密封件的唇前角和唇后角進行了有限元數(shù)值模擬研究。找出了工況參數(shù)和結(jié)構(gòu)參數(shù)對密封性能影響規(guī)律,獲得了密封件較優(yōu)的結(jié)構(gòu)參數(shù)。 進行理論分析和數(shù)值模擬后,對較優(yōu)的密封結(jié)構(gòu)的密封圈進行了設計、制造。為了對該密封產(chǎn)品進行試驗,模擬節(jié)流閥的實際工況,設計制造了檢驗密封圈的工裝,對密封圈進行了多次對比試驗。試驗結(jié)果表明,三種不同改性材料,只有添加10%的碳纖的聚四氟乙烯能夠使用于此類超高壓的工況之下。所研制的密封圈通過157.5MPa的水壓試驗以及105MPa的氣壓試驗。 本文所研制的超高壓泛塞封在相關氣田上試用效果良好,得到了相關部門的高度評價。
[Abstract]:Ultra-high pressure throttle valve is one of the indispensable equipments in the production process of high pressure and high yield gas fields. At the same time, its sealing performance determines the quality of the product and is also the guarantee of the safe operation of the throttle valve. Moreover, the throttle seal is a consumable product which can not be reused. It is the technology of foreign manufacturers all the time, and the products are monopolized completely. The flooding seal studied in this paper is a dynamic sealing device on a throttle valve in a gas field. The main structure of the plug-in seal consists of high-performance spring and high-molecular material seal ring. The finite element simulation analysis of this type of sealing ring under different working conditions and the study of its sealing performance can improve the reliability of the seal, provide the basis for the design and expand the field of its application, which is of great significance. Based on the sealing principle and sealing materials, this paper analyzes the sealing mechanism of fluid static and dynamic pressure. The mechanical properties of three kinds of modified materials were obtained by tensile and compression tests. A finite element model was established for the panplug seal, and the stress and strain distribution after installation and after the application of 105MPa was analyzed by numerical simulation of the flooding seal under the static working condition. The distribution of contact stress and contact width under static seal is obtained. The influence of compression and working pressure on the static seal performance is analyzed. The main factors affecting the seal are the working condition parameters and the structural parameters of the seal. In this paper, the velocity of the shaft and the friction coefficient of the contact surface during the use of the flooding seal are studied. The numerical simulation of the labial front angle and labial rear angle of the seal was carried out by finite element method. The influence of working condition parameters and structural parameters on the seal performance is found out, and the optimum structural parameters of the sealing parts are obtained. After theoretical analysis and numerical simulation, the sealing ring with better sealing structure is designed and manufactured. In order to test the sealing product and simulate the actual working condition of the throttle valve, the tooling for inspecting the sealing ring was designed and manufactured, and several comparative tests were carried out on the sealing ring. The experimental results show that only 10% carbon fiber PTFE can be used in this kind of ultra-high pressure condition for three different modified materials. The seal ring has passed the water pressure test of 157.5MPa and the air pressure test of 105MPa. The UHP flooding seal developed in this paper has a good trial effect in related gas fields and has been highly evaluated by relevant departments.
【學位授予單位】：西南石油大學
【學位級別】：碩士
【學位授予年份】：2015
【分類號】：TE937

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