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Linear Finite Element Analysis of compressor valves


Line of the compressor operating frequency is 50Hz,[link widoczny dla zalogowanych], the vibration frequency of the valve 150-250Hz or so, if the valve work at its natural frequency, the vibration will be more intense,[link widoczny dla zalogowanych], resulting in decreased life of the valve,[link widoczny dla zalogowanych], or even damage the valve. The results from the above we can see that the valve operating frequency much lower than its natural frequency, it is more secure. 2.4 Modal expansion analysis based on modal analysis of modal analysis of further expansion (expansion mode is to reduce the degrees of freedom extended to the full degree of freedom), so that the resonance frequency can be obtained on the basis of all further resonant frequency of the valve of the stress distribution. Figure 4 shows the resonant frequency of the stress distribution. Figure 41640.3Hz the stress distribution in Figure 3 the results of well-designed gas valve required valve thrust and bending stiffness to adapt. Therefore,[link widoczny dla zalogowanych], the suction pressure, the valve material and thickness are mutually conditioned. A particular valve, at a time, the deformation of the valve depends on the moment acting on the valve on the pressure force and the valve velocity and acceleration. Take suction valve chip is the center of the suction orifice as the representative of the nodes, and its law of motion with the time period shown in Figure 5-6. HJUDMACHERYVo1.33, No. 2,2005 can be seen from Figure 5, because there is no lift limiter, suction valve seat chip hit multiple times, which is the main source of noise in the compressor. General, when the valve seat impact speed <1.5 ~ 2.5m / s when the valve design that is reasonable 【. Suction valve also can be seen that a slight delay in the closing piece, the need for further improvement. l ・ 2, _, lo. 6O. O0.0000.0100.020f (s) Figure 5, the valve displacement curve of 60O. 0000.0100.020f (s) Figure 6 velocity curves of the valve 7 piece suction valve damaged photo in Figure 7 is a prototype piece suction valve of the kind of fatigue damage photos. It can be seen, the site of valve fracture stress of the valve is more concentrated on the neck, should be further optimized design, and the stress distribution of the above analysis is more consistent to verify the correctness of the theoretical model. 4 Conclusion linear compressor suction valve according to the structural characteristics of the small deflection plate theory, finite element method, the inherent characteristics of suction valve films were analyzed by the movement of the valve. Suction valve sheet by modal analysis, the natural frequency of the suction valve and vibration, so as to design the shape of the valve, the valve of the impact fatigue damage analysis provides the necessary basis. Suction valve sheet is more complex shapes, finite element method gives a more accurate differential equation solving method, simulation results show that the dynamic stress distribution is more consistent with the actual form of stress. Pointed out that the valve of the stress concentration should be further optimized design. References: [1] Guo Bei. Rotary Vane air compressor thermodynamic performance of [D]. Xi'an: Xi'an Jiaotong University, 2000. [2] Kai-Tai Li, Huang Ai Xiang, Huang Qinghuai. Finite element method and its application [M]. Xi'an: Xi'an Jiaotong University Press, 1992. [3] Lin Mei, Wu industry is. Compressor automatic valve [M]. Xi'an: Xi'an Jiaotong University Press, 1991. Author: Yang Bingchun (1982 a), male, postgraduate students, mainly in the compressor design and analysis, mailing address: Xi'an Jiaotong University, Xi'an 710049, Shaanxi Institute of compressors. \1st edition edition content than the larger changes and additions. A total of 2l book chapters, 1,164,000 words, 2o page color pages. Introduction describes the filter, particles and the nature of liquid and slurry, filter and filter press theory theory of new results; described filter media, filter cake washing and cake dehydration, pretreatment, clarification and filtration, cross flow dynamic filtering technology, membrane filtration, biological filtration, with electric and magnetic fields, sound field filtering the latest filtration technology; focuses on commonly used and new filter, auxiliary equipment and system debugging, filtering centrifuge, filter the proportion of amplification, filter design computation, filter testing and selection, and other folders with the technology; also introduced filtering technology in mineral processing, metallurgy, coal, petroleum, chemical, pharmaceutical, food, environmental protection and other areas of application. Book available in filtration technology, design, manufacturing, utilities, marketing, engineering and technical personnel to use, but also as teachers and students of tertiary institutions teaching related reference books. Ding Kai still holy book, edited by Wang Wei first-class, Professor Jin Dingwu trial. Unit 120 (on the books, the price discount, Tel :010 -63952908, Contact: Ding Kai St.).

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