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| Design and research of high pressure sealing connector |
| LI Wei1, LEI Hong-xiang1, LI Zong-qi2, LI Bin2, YUAN Sheng-tong1 |
1. College of Mechanical and Electrical Engineering, Southwest Petroleum University, Chengdu 610500, China;
2. Downhole Operation Company, Chuanqing Drilling Engineering Company Limited, Chengdu 610051, China |
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Abstract In order to improve the sealing reliability of the lead wire from the pressure chamber in the high pressure environment and ensure that the electronic equipment used in the downhole tool can work under atmospheric pressure, a kind of injection class high pressure sealing connector was designed. The sealing connector which filled with rubber and epoxy resin was analyzed based on the finite element software, and the experimental verification was carried out. Analysis and experiment results showed that when the filling material was rubber, the sealing property was good, but the material was easy to be squeezed out, and 88°was a better choice for the semi-cone angle of shell body. When the filling material was epoxy resin, material protrusion could be avoided, but there would be liquid leaking in a certain pressure range. When the filling material was rubber and epoxy resin, evagination distance decreased with increasing of epoxy resin and the use ratio of epoxy resin 40% was a good choice. High pressure sealing connector mainly relied on first five threads to bear load. The maximum stresses appeared at the minor diameter between first thread and second thread of shell body. The maximum stresses of contact pin appeared at the upper border between rubber and epoxy resin. The researching achievement has certain significance for design of high pressure sealing connector and selection of filling material.
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Received: 16 March 2016
Published: 28 June 2016
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高压密封连接器的设计及研究
为了提高耐压腔室内引出导线在高压环境下密封的可靠性,保证井下工具内使用的电子设备能够在常压下工作,设计了一种注塑类高压密封连接器.使用有限元软件对内部填充材料为橡胶、环氧树脂时的连接器密封性能作了分析,并进行了实验验证.分析和实验结果显示:当填充材料为橡胶时,其密封性能较好,外壳体的半锥角取88°较为合适,但在高压作用下橡胶易被挤出;当填充材料为环氧树脂时,可避免材料挤出现象发生,但在一定密封压力范围内会出现液体泄漏;当2种材料组合使用时,随着环氧树脂比例的增加,填充材料的外凸距离减小,环氧树脂体积比为40%较为合理.高压密封连接器主要靠前5扣螺纹承载,最大应力出现在外壳体的第1扣螺纹与第2扣螺纹之间的小径处;插针的最大应力出现在橡胶与环氧树脂交界处偏上位置.研究成果对高压密封连接器的设计以及内部填充材料的选择具有一定的参考意义.
关键词：
高压密封连接器,
橡胶,
环氧树脂
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