Dynamic optimization design of air compressor air inlet muffler Zhou Chaoxing (Dali Hengtai Safety Technology Co., Ltd., Dali 671000, Yunnan) has adverse effects, and it is particularly important to study the suppression of air compressor noise. Through optimization theory analysis and advanced algorithm exploration, the paper optimizes the muffler of the air compressor inlet of model VW-0.22/7-B, and finds a solution to the practical problems existing in the air compressor.
1 The function and type of muffler On the air compressor and blower, equipment is usually installed with a muffler. This is because aerodynamic equipment generates a lot of noise during operation and causes noise pollution to the surrounding environment. At present, there are many types of mufflers, which can be divided into resistance and resistance. Among them, the former works by means of the sound absorbing material embedded in the tube and the corresponding sound absorbing structure, so that the noise is effectively attenuated when passing through the pipeline, achieving the purpose of sound elimination, and the mechanism of the mechanism and the resistance energy dissipation in the circuit. Similarly, it has a good effect in controlling high frequency noise. The latter cannot achieve direct absorption of sound energy. The working principle of the expansion chamber muffler is to reduce the noise through the contraction and expansion of the cross-section of the pipeline; the working principle of the resonator muffler is to reflect the noise at the sudden change through the acoustic impedance mismatch of the resonant cavity. And interference phenomenon to achieve noise reduction, this muffler is often used in the elimination of low and medium frequency noise. At present, in order to expand the frequency range of noise cancellation, impedance composite mufflers have begun to be used in many applications.
2 Resistive muffler part design In the resistive muffler, the sound absorbing material needs to be selected first. The sound absorbing wall of the resistive muffler is the inner wall of the muffler pipe. When the sound wave propagates in it, the inner wall of the pipe will continuously absorb the sound energy, and the sound pressure and sound intensity will be attenuated with the extension of the distance. The noise reduction is ideal for ensuring the muffler. The muffling effect is generally increased in the design. According to the theoretical analysis, the muffler of the muffler designed in this paper is about 20 decibels. According to practical experience, this paper finally determines that the maximum muffler is designed to be 22 decibels. It can be seen from Table 2 that the constrained optimization method is used at 500 Hz. The problem is solved. In the specific solution process, there are two kinds of direct solution method and indirect method. Among them, the latter method has the distinction of equality constraints and inequality constraints. In the solution process of this paper, the optimization method adopted is the interior point penalty function method. It is an indirect solution to the inequality constrained optimization design problem. The interior penalty function method needs to define a feasible domain. For an optimization design problem satisfying gu(X)0(u=i, 2, 3..., m), the form of the penalty function can be expressed as: where r(k) represents a penalty factor, and the penalty factor satisfies the following The relationship: the penalty function in this paper is: Table 2 noise octave sound pressure level and noise reduction octave sound pressure level (Hz) measurement point A sound level installed muffler before the need for noise reduction, a vacuum coating environment Shutter-type observation window Zheng Haishun Li Liangsheng Jiang Xunxiang (Dongguan Hongwei Digital Machinery Co., Ltd., Dongguan 523080, Guangdong, China, closed device, mainly used in vacuum coating equipment to prevent certain metal elements or corrosive substances from being directly plated to the observation window glass An institution on the chip.
The vacuum coating industry is an important part of the high-end industrial industry. In recent years, coating technology and film products have been widely used in industry, especially in the electronic village materials and components industry. The observation window is applied to the vacuum coating equipment to observe the internal production process of the vacuum vessel. The shutter-type observation window is a structure that is detachable and compact, and is designed to prevent some metal elements or corrosive substances from being directly plated on the glass sheet during the coating process. The traditional baffle observation window, in order to meet the rotation space of the baffle, the overall size is larger, larger than the diameter, according to the ISO100 flange diameter size, the length is about 140mm. Due to structural problems, the center position is equipped with a rotating shaft, and the viewing angle is blocked. The shutter-type observation window has a thickness of about 36 mm, is thin, does not occupy space, has a wide viewing angle, and does not block the viewing angle, and is superior to the conventional baffle observation window.
1 Design advantages Main components include: 1. Handle, 2. Gland, 3. Ball bearing, 4. Base, 5. Rotary shaft (1-shaped seal, 6. Rotary shaft, 7. Pinion, 8. (1 shape) Sealing ring, 9. inner shutter piece, 10. tension spring, 11. glass gland, 12. glass piece, 13.0-shaped sealing ring, 14. retaining ring, 15. outer shutter piece, 16. adjusting ring, 17. steel ball , 18. The cover.
The design has the advantages of compact overall structure, small space, simple installation, use of steel balls as sliding parts, low friction and reliable sliding. It adopts fluororubber as sealing village material, has good sealing performance and long service life, and is suitable for medium and high vacuum environment.
2 structural design, working principle and material, as shown in the initial closed state of the shutter type viewing window, the inner shutter piece 9 is pressed against the limit by the small retaining ring on the outer shutter piece 15, and the outer shutter piece 15 is located on the inner shutter piece 9. The fulcrum and the tension spring 10 are pulled to limit the inner and the shutter.
Analysis of calculation results: According to the BAS1C program of the internal point penalty function method, the optimal size of the muffler to be designed in this paper can be calculated by QBAS1C software. The final result is m=18, L=0.1m. In order to ensure that the muffler can eliminate the noise higher than the design standard, the length of the muffler is appropriately lengthened based on the design result. Finally, the L is set to 0.11mO.
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