In order to improve the performance of the compressor, the company imported advanced N-line and grinder processing technologies from abroad, greatly improving the energy efficiency ratio of the compressor, but at the same time, some new problems have emerged. For example, the problem of increasing the noise of screw refrigeration compressors , the following Xiaobian take you to see how to solve the problem of screw refrigeration compressor noise.
1 Introduction
The single-stage screw refrigeration compressor has a large pressure ratio and a wide flow range, and is suitable for various operating conditions with an evaporation temperature of -40 to 5°C. It is widely used in various occasions such as industrial refrigeration and central air conditioning. In recent years, all major screw compressor manufacturers are working hard to improve the overall performance of the compressor. Dalian Refrigeration Co., Ltd., as the largest compressor manufacturing base in China, has been committed to providing users with efficient and stable screw compressors and Its crew.
2, test results
Tested under standard conditions and full load conditions, the layout of the measuring points is as follows, and the dashed line represents the test range of the 1m line.
Through the noise test, 1 point of noise is 87. 8dB (A), 2 points of noise is 96. 6dB (A), and 3-point noise is 91.5dB (A).
3, sound source analysis
It can be seen from the test results that the noise at 2 o'clock and 3 o'clock is significantly higher than 1 o'clock, ie, the noise at the oil separator side is much higher than the noise at the compressor side, so it is considered that the noise source of the whole unit is mainly concentrated at the oil separator. In addition, the noise spectral peaks at 2 o'clock and 3 o'clock are as high as 90 dB or more. The corresponding frequency is 1000 Hz and the frequency is relatively simple. The compressor speed is 2960 r/min (equivalent to 50 Hz). It is initially assumed that the noise is caused by the pulsation and oil separation of the exhaust gas flow. The natural frequencies of the parts of the device are close to each other, thus forming an air column resonance sound and causing a large noise.
4, improvement suggestions
After testing and analysis, the noise of the LG16 compressor unit is considered to originate from the oil separator, and the compressor noise has been improved compared to the past. To eliminate air column resonance, we can only change the natural frequency of the oil separator. It is recommended that the internal structure of the separator be The import pipeline layout is modified. After analyzing and calculating, we have improved the structure of the oil separator. The structure is shown in Figure 3. After retesting, the 2-point noise is 88·3dB. The overall noise has also reached the national standard.
5. Experience summary
Dalian Refrigerator Co., Ltd. has been paying attention to the research on compressor noise for many years. Through the theoretical research and practical tests of noise, it has some understanding and experience of compressor noise. We believe that reducing the noise of the screw compressor unit should start from these aspects: To reduce the noise of the compressor's exhaust airflow, we need to design the exhaust muffler; in order to reduce the noise of the coupling, we calibrate the motor shaft and the compressor. Spindle Concentricity; In order to reduce the noise of the oil separator, we change the structure of the oil to avoid resonance with the exhaust gas flow, and you can also add silencers to the oil. There are many noise sources in the screw compressor unit and the mechanism is complicated. We need further in-depth research and analysis.
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