Finite element analysis and topological optimization of the portable air compressor valve of Zhejiang University Journal of Engineering Edition Zhong Meipeng Zheng Shuiying. Pan Xiaohong. School of Mechanical and Energy Engineering, Zhejiang University. Hangzhou, Zhejiang, 17; 1 Jiaxing College Electromechanical Branch. Jiaxing, Zhejiang 3141.1 Institute of Chemical Machinery, Zhejiang University. Zhejiang Hangzhou 3127 press exhaust valve plate is optimized. According to the topology optimization result of the exhaust valve piece, the structural parameters of the exhaust valve piece are determined, and the force of the exhaust valve piece is analyzed.

On this basis, ANSYS simulation of the exhaust valve piece was carried out, and the natural frequency of the exhaust valve piece was obtained. The modal simulation of the exhaust valve plate is clear. The optimized exhaust valve natural frequency is far from its opening frequency and does not cause resonance. At the same time, the stress distribution and displacement distribution of the optimized valve plate were simulated. The simulation results are clear. The optimized valve plate stress and overall deformation trend are in line with the actual situation. The equation of motion of the exhaust valve plate is established. The simulation analysis of the movement law of the valve piece is carried out, which proves that the opening of the valve piece is normal.

The gas valve is the key component of the compressor, and it is also the most vulnerable to damage. 1. Excellent gas valve, which requires a longer period of service life and other factors that directly affect the compressor's exhaust power consumption and operating dynamic resistance loss. For the compressor refers to the power of 4,8, and the counter-receipt date 2008 1208. Zhejiang University Journal of Engineering Edition website evaluation. 0This 3.2.,绠61 fund project Zhejiang Provincial Research Industry Funded Project 2006,21049., male, Jiangxi, pleasant, doctoral student, engaged in mechanical manufacturing research. 12,196叩5, Claw Communication Contact Zheng Shuiying, female, professor. Has been ship 121 315? 2.6.0 hit, its flow loss can be as high as the power of 1 therefore, to ensure that the compressor has a higher working efficiency. Air valve leakage must be reduced to increase valve sealability and extend service life.

The high-pressure direct-coupled portable air compressor is a high-speed portable micro air compressor in which the crank-and-crank linkage of the compressor is directly connected to the motor shaft. Its small size, light weight and easy to carry, avoiding the loss of efficiency of the coupling and improving the efficiency of the whole machine, but the volume of the compressor is reduced. The valve is designed to withstand high pressures while meeting performance.

Therefore, higher requirements are placed on the design of the valve. At present, the design of the gas valve still adopts the traditional analogy and similar design theory, and does not fundamentally solve the quantitative analysis calculation and design of the gas valve. As a result, some compressor valves do not meet the requirements of changing working conditions, resulting in poor work reliability and short working life. In this paper, the structural topology optimization variable density method is used to optimize the exhaust valve of the direct-connected portable air compressor, and a new method for designing the valve plate is sought.

1 Topological optimization mathematical model Continuum topology optimization methods mainly include variable thickness method variable density method and uniformization theory. 3. Variable density method. The basic idea of ​​the edge 1 is the physical description of the 1.1 mountain. The basic idea is to artificially introduce a hypothetical variable density material, such as the allowable stress. The equivalent relationship between the elastic modulus and the like and the material equivalent density is also artificially assumed. In the optimization, the material density is used as the topology design variable. In this way, the topology optimization of the structure is converted into the optimal distribution of the material.

It is assumed that the nonlinear relationship between material properties and their density is degree, subscript, and actual material properties. The mathematical model of the exponential variable density method is the volumetric force and the area force of the structure, which is the upper limit of the material quality of a given initial structure. For the optimization, specify the mass of the removed material, and the unit number for which the unit density remains unchanged after artificially optimizing the lower limit of density.

When the exhaust valve topology is optimized, the two bolt holes are fixed. 1 and = full constraint material ruler = 2.05710, Poisson's ratio 3.12 exhaust valve piece force analysis when the exhaust valve piece is not open. The exhaust valve plate is subjected to gas static pressure on both sides. When the gas pressure on the front side of the exhaust valve piece is slightly larger than the gas pressure on the back side, the exhaust valve piece starts to move from the stationary state, and then continues to move under the pressure difference between the two sides. The gas pressure acting on the exhaust valve plate may be related to the displacement time; 2, in order to reflect the gas force distribution law, it is the rotation angular frequency of the main shaft. In the vicinity of the exhaust valve hole, it can be considered that the gas pressure in the cylinder is widely distributed. The gas pressure difference is determined by the following equation: the pressure difference between the two ends of the valve plate and the flow of the gas through the exhaust valve piece. It is very difficult to calculate by theory. Scholars have done a lot of research in this aspect. On the basis of experiments, the maximum travel of the mathematical model of gas force is established by approximation method, which is the crank angular velocity, which is the crank length and the topology optimization structure for the connecting rod. The size of the exhaust valve piece is 2, and the thickness of the valve piece is 0. The length of the valve is the equivalent force area of ​​the exhaust valve hole. The instantaneous gas mass in the cylinder is the inlet gas density. It is a variable process index. For the intake gas pressure, where is the exhaust gas pressure.

According to the above-mentioned stress situation, the exhaust valve piece is subjected to human 57, and the stress distribution is obtained by simulation analysis; and the displacement distribution result shows that the maximum stress of the valve piece is 6; 109; the yield strength of the valve piece material 30 is limited to 1.0807109 by the lift limit. The constraint of the device is that the maximum displacement of the valve layer after the force is applied. 8. Match the actual situation.

Put +, the mass matrix is ​​the natural circular frequency.

The solution of Equation 7 is the natural frequency of the air compressor disc.

Using the finite element software 83 to calculate the results, the first order natural frequency of the exhaust valve is 1 step, 1 for 12, 12 for 1212, 3 for 1, 609, and 4 for 2237. The boundary condition is two bolt holes and; The three directions are fully constrained.

5 first-order vibration mode of air compressor exhaust valve. The maximum speed of the air compressor is 2, 1. Then the opening frequency of the valve is 33.3, so the opening frequency of the valve is less than the natural frequency of the first order of the valve.

The modal analysis of the 31-order mode 3 exhaust valve modal analysis is used to determine the vibration characteristics of the structure or component such as the natural frequency and mode 6 to distinguish the excitation frequency at which it is excited. The external excitation vibration frequency is avoided by the natural frequency. Avoid the resonance under the vibration mode and effectively reduce the vibration value. Through the modal analysis, the dynamic characteristics and weak links of the air compressor valve can be visually displayed, which provides a theoretical basis for valve processing. Finite element analysis was performed on the modal analysis of the valve plate. The 4th order natural frequency of the air compressor valve is obtained.

The overall free vibration equation of the air compressor valve plate is based on the motion equation and simulation of the 4th-order mode 4 exhaust valve plate. In order to verify the applicability of the optimized valve plate, the equation of motion of the exhaust valve plate is established. And use 1 software for numerical calculation.

The differential equation of the flow of the ideal gas during the exhaust process is the working volume. For the instantaneous effective valve clearance area of ​​the exhaust valve, 7, is the gas thermodynamic temperature in the exhaust chamber. For the time.

The differential equation of the motion of the valve plate is as follows: the effective force area of ​​the valve plate. Where is the stiffness factor of the valve plate. ; is the displacement of the valve.

If the rotational angular velocity of the main shaft is called constant, the differential equation of the gas valve and the differential equation of the gas flowing through the gas valve are solved in a differential equation, and the motion law of the valve can be obtained, and the gas in the cylinder can be obtained. State parameters. The specific form of the equations is Lu Xijiu, the ratio of k to the length of the link. For the clearance volume.

Use, 1. B software to calculate the opening area of ​​the exhaust port. Relationship with the spindle angle 6 shows that the exhaust valve is normally open.

5 Conclusion The optimal parameter model of the exhaust valve plate. A force analysis model was established for the exhaust valve. The human 8 simulation was carried out, and the stress cloud and displacement cloud of the valve plate were obtained. The analysis results show that the method can accurately predict the maximum stress distribution and dangerous section of the valve during the movement. Thereby the shape of the valve plate can be optimized. Obtain the shape of the valve plate with the least stress concentration on the valve plate. Improve the reliability of the valve plate. The modal analysis of the valve was carried out, and the natural frequency of the valve was obtained by applying 48 analysis, and the simulation results were clear. The optimized results of the direct-connected portable air compressor exhaust valve show that the overall stress deformation trend and natural frequency of the valve plate are in line with the actual situation. The effectiveness of topology optimization in valve design is illustrated, and a new method for valve plate design is explored.

Wu Rongren, Liu Shengli, Lu Junyi. The gas pressure in the cylinder is calculated when the stroke of the intake valve of the compressor is opened. Cryogenic Engineering, 2000, 753,740.

Jia Weixin, Hao Zhiyong, Xu Hongmei. The lightweight design of the single cylinder machine based on the structural optimization method. Journal of Zhejiang University, Engineering Edition, 2008, 422224228.

The topology of the direct-connected portable air compressor valve is optimized, and the appendix is ​​obtained. 6+, 6 and 8, and 2 long 5 are connected to the 2308th page, Li Changyong. Research on template sequence optimization design after injection molding machine 1. Journal of Zhejiang University Engineering, 2006, 406937 Ke Changzhong, Nie Qingfeng, Ni Xiaoping, et al. Movement law of piston valve valve Wei Yanding, Chen Dingzhong, Cheng Yaodong. Modal control of piezoelectric cantilever vibration Cui Zhiqin, Yang Ruifeng. Parametric modeling and modal analysis of complex mechanical structures. Journal of Mechanical Engineering, 2008, 442234

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