Design and experimental study on relief valve with permanent magnetic compression spring
SI Guo-Lei-1, YANG Feng-Yu-1, WANG Wen-Jie-2, LI Zheng-Gui-1
(1.Institute of Magnetic Physics and Magnetic Technology, Lanzhou University of Technology, Lanzhou, Gansu 730050, China; 2.Research and Development Center, Fenghuo Machinery Factory, Chengdu, Sichuan 611130, China)
Because the helical compression spring has frequently suffered from various failures, such as fatigue fracture, corrosion cracking, relaxation, plastic deformation, permanent deformation during its operation in hydraulic components, a noncontact design concept was put forward for the relief valve by making use of permanent magnetic compression spring, and then the basic structure, working principle, electromagnetic force, stiffness characteristics for the valve were studied. Initially, a permanent magnetic compression spring was designed by means of analytical calculation and experimental validation so that the characteristics that magnetic force is superior to helical mechanical compression spring has been made full of use. Then a relief valve was constructed with the spring, eventually the valve performance was measured. The results show that the magnetic force keeps to be a near constant 70±5 N when the gap between the permanent magnet valve core and the valve base is 0.4-1.2 mm. During the step response test, the pressure fluctuation in the relief valve with permanent magnetic compression spring is 11.7%, compared with 22.8% in the valve with a helical mechanical compression spring. For the same technical specifications, the size of the valve with permanent magnetic compression spring is 37.5% smaller than one with a helical compression spring. Thus, we can make full use of the advantage of permanent magnetic compression spring in hydraulic valves, nevertheless further investigations still are on demand.
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