Abstract Twin-screw compressors are widely used in refrigeration systems, but typically suffer from severe vibration and noise due to pulsing gas flow during operation. Gas pulsation is the main noise excitation source of screw compressors, presenting significant fundamental harmonic characteristics. This study examined noise control technologies for screw refrigeration compressor designs, such as acoustic wave interference, gas–solid resonance, and perforated muffler. Based on the structure characteristics and noise spectrum characteristics of a single-machine two-stage screw refrigeration compressor, several noise reduction measures were tested, including a half-wavelength tube, Helmholtz resonator, and multi-cavity series muffler. The experimental results show that after optimization, the noise measured on the exhaust side was reduced from 85.3 dB(A) to 81.9 dB(A) under the rated conditions of −25 °C evaporating temperature and 50 °C condensing temperature. At a constant 50 °C condensation temperature, the noise on the exhaust side of the compressor decreased from 93.7 dB(A) to 85.9 dB(A), an improvement of 7.8 dB(A), at 0 °C evaporation temperature. At an evaporation temperature of 5 °C, the noise on the exhaust side of the compressor decreased from 95.6 dB(A) to 86.5 dB(A), an improvement of 9.1 dB(A), indicating effective optimization under variable working conditions.

中文翻译：

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两级螺杆制冷压缩机的噪声控制

摘要 双螺杆压缩机广泛应用于制冷系统中，但在运行过程中，由于气流脉动，通常会产生剧烈的振动和噪音。气体脉动是螺杆压缩机的主要噪声激励源，具有显着的基波谐波特性。本研究研究了螺杆制冷压缩机设计的噪声控制技术，例如声波干扰、气固共振和穿孔消声器。根据某单机两级螺杆制冷压缩机的结构特点和噪声频谱特点，对半波长管、亥姆霍兹谐振器、多腔串联消声器等多种降噪措施进行了测试。实验结果表明，优化后排气侧测得的噪声从85降低。3 dB(A) 至 81.9 dB(A) 在 -25 °C 蒸发温度和 50 °C 冷凝温度的额定条件下。在恒定的 50 °C 冷凝温度下，压缩机排气侧的噪音从 93.7 dB(A) 降低到 85.9 dB(A)，在 0 °C 蒸发温度下提高了 7.8 dB(A)。蒸发温度为5°C时，压缩机排气侧噪声从95.6 dB(A)降低到86.5 dB(A)，提高了9.1 dB(A)，表明变工况下的优化有效。