旋转弯曲载荷作用下管接头螺纹连接松动现象试验研究  

Experimental Study on Thread Loosening and Leaking of Pipe Joint under Rotational Bending Loads

作　　者：钟后顺 贾铎 赵爽 张哲[3] 石大鹏 王润良 丁晓宇[1] 张旭[1] ZHONG Hou-shun;JIA Duo;ZHAO Shuang;ZHANG Zhe;SHI Da-peng;WANG Run-liang;DING Xiao-yu;ZHANG Xu(School of Mechanical Engineering,Beijing Institute of Technology,Beijing100081,China;AECC Shenyang Engine Research Institution,Shenyang 110000,China;China Aero-Polytechnology Establishment,Beijing100028,China;Henan Aerospace Precision Machining Co.,Ltd.,Xinyang 464000,China;Henan Key Laboratory of Fastening Connection Technology,Xinyang 464000,China)

机构地区：[1]北京理工大学机械与车辆学院,北京100081 [2]中国航发沈阳发动机研究所,沈阳110000 [3]中国航空综合技术研究所,北京100028 [4]河南航天精工制造有限公司,信阳464000 [5]河南省紧固连接技术重点实验室,信阳464000

出　　处：《强度与环境》2022年第1期15-22,共8页Structure & Environment Engineering

基　　金：国家自然科学基金重点支持项目(U2141217);航空发动机集团产学研项目(HFZL2019CXY021-2);国家自然科学基金面上项目(51975055)。

摘　　要：螺纹连接松动被认为是导致管接头密封性能衰退的因素之一,但工程中缺少证明该观点的试验数据。本文基于HB 6442-90规定的旋转弯曲疲劳试验方法,以74°锥面管接头为研究对象,验证了往复载荷作用下管接头的螺纹连接可能出现松动并导致管接头密封性能逐渐衰退。本文还对传统的管接头进行了改进,引入了一种新型防松螺纹,通过试验验证了该防松螺纹可以有效避免管接头的螺纹松动,从而显著提升管接头密封性能的稳定性。Looseness of threaded connections is considered to be one of the factors leading to the deterioration of the sealing performance of pipe joints,but there is a lack of experimental data to prove this point in engineering.Based on the rotational bending fatigue test method specified in HB 6442-90,this paper takes the 74-degree pipe joint as the research object,and it is verified that the threaded connection of the pipe joint may become loose under the action of reciprocatingloads,which may lead to the gradual decline of the sealing performance of the pipe joint.This paper also improves the traditional pipe joint and introduces a new type of anti-loosening thread.It is verified by experiments that the anti-loosening thread can effectively avoid the thread loosening of the pipe joint,thereby significantly improving the stability of the sealing performance of the pipe joint.

关 键 词：管接头 密封性能 螺纹松动 防松螺纹 旋转弯曲疲劳试验 

分 类 号：TH131.3[机械工程—机械制造及自动化]