Study Of Ycv-01Relief Valve With Permanent Magnetic Spring

At present, many scholars at home and abroad had a lot of research on helical compression spring fatigue fracture through heat treatment, material selection and the other way, Failure modes include fatigue, corrosion, hydrogen embrittlement fracture, relaxation, plastic deformation, permanent deformation and so on. Because the loads of different the compression spring parts is different, so the stress concentration can’t be eliminated completely, working by the cyclic stress, and slowly expanding, when the stress is greater than the spring stress limit, helical compression spring will fracture, deformation and failure, the hydraulic system is unable to be controlled, especially for aerospace hydraulic servo system, Once the pressure can not be controlled, hydraulic servo system will not work properly, attitude control will fail, We will not be able to put manned spacecraft, satellites into orbit.Many researchers has done a lot of research on the overflow valve static design and dynamic analysis work, and made some important achievements, but the application of permanent magnet spring in the relief valve is relatively small, corresponding theoretical analysis is not much. How to carry out the function selection, application of the permanent magnetic spring, the relief valve has simple structure to obtain the optimal, which is one of the important research topic in the overflow valve design.In this paper,the author fully investigate the current situation of domestic and foreign permanent magnetic mechanical application and research, make full use of magnetism " Like magnetic poles repel each other, unlike magnetic poles attract each other",and puts forward the non-contact permanent magnetic compression spring (the following referred to as "permanent magnet spring") design concept, which reduces mechanical spring fracture, deformation of the risk; the neodymium iron boron permanent magnetic material is used as spring material, We carried out research and experimental characteristics of permanent magnet spring and permanent magnet type overflow valve, the main work and achievements are as follows:1、The paper introduces the basic theory and numerical calculation of permanent magnet spring permanent magnetic force estimation. Through the calculation of the typical case, discusses the accuracy of numerical calculation, summarize the magnetizing law, when the permanent magnet spring permanent magnetic force and displacement is linear, nonlinear, a substantially constant or small slope relationship.2、The paper puts forward the concept of permanent magnet spring maximum thrust weight ratio, convenient for engineers to under stand, which is not only the external characteristic parameters of maximum energy product, but also the key parameters of magnetic machine design.3、Through the study of four different magnetization angle, we found the largest permanent magnetic force is3.3times of the minimum permanent magnetic force, derive magnetization direction and the permanent magnetic variation, and expound the basic principle of magnetic.4、Based on the permanent magnetic spring type overflow valve and mechanical spring relief valve of comparison, the same specifications, permanent magnetic spring valve fluctuation is38.5%smaller than mechanical spring valve; permanent magnet spring volume is37.5%smaller than mechanical spring valve, therefore, we should make full use of permanent magnetic spring advantage of in-depth study on hydraulic valve design.