Abstract: Refrigerator pipeline resonance noise has always been one of the main sources of noise in the refrigerator machinery room. The exhaust pipe is the main pipeline component of the machinery room, and the pipeline resonance noise generated by it has always been the focus of research. Generally, reducing the resonance noise of the exhaust pipe is mainly by applying a corresponding number of shock-absorbing hammers on the exhaust pipe to achieve the purpose of reducing vibration and noise. This method not only needs to specifically consider the location of the shock-absorbing hammer, but also needs to increase the cost budget. Based on this, in view of the resonance noise of the compressor exhaust pipe, a certain model of refrigerator was selected, and the structure optimization design of the exhaust pipe was carried out under the condition of controlling the pipe length unchanged, and the performance was optimized by combining simulation analysis technology. The results show that, combined with the natural frequency simulation results, by changing the original pipeline direction of the exhaust pipe, it can achieve the vibration and noise reduction effect of the original damping hammer. The first order frequency error is only 0.063%, which not only achieves the original reduction. It also reduces the budget cost to a certain extent, and provides a reliable reference and direction for the refrigerator pipeline resonance noise research and pipeline structure optimization design.

Key words: Refrigerator, Pipeline noise, Exhaust pipe, Resonance, Fixed frequency