Performance Analysis And Optimization Research Of Mufflers In Refrigerating Compressor

The refrigerator has become one of the indispensable important household appliancesin people’s daily life. The refrigerating compressor, which works as the compressor’s heart,has a direct impact on the refrigerator noise, energy consumption and environmentalperformance. However, refrigerating compressor belongs to high-tech product, while ourrefrigerating compressor companies have been busy expanding production to cope withthe fierce market competition, considering less on the digestion, absorption of theintroduction technology. From technical level to say, we are still in a simple productionsituation and have not yet formed our own technology. In recent years, some enterpriseshave realized the importance of improving product quality, and spent a certain amount ofhuman, material on structural optimization and technology R&D of products.Just under the above context, this thesis is begun. The main purpose of this thesis isto reduce energy consumption and noise of the refrigerating compressor. The researchachievement has a very important practical significance for improving the overallperformance, reducing noise, thereby increasing the market share of the product. Thisthesis mainly consists in the following aspects:First, structure modal and acoustic modal of a semi-direct suction muffler areanalyzed using FEM, natural frequencies and mode shapes of the muffler shell structureand its internal cavity are acquired, and the results provide a theoretical basis to reduceradiation noise of the muffler shell and resonance noise of the internal cavity;Second, flow performance and acoustic performance of a semi-direct suction mufflerare simulated using FVM and FEM, and structural optimization is applied to it to reduceoverall noise of the compressor.Third, flow performance and acoustic performance of four kinds of suction mufflerwith different freezing medium are analyzed, and the research achievements can beadopted to predict the synthesis property of mufflers, which could provide theoreticalfoundation for the design, selection and structural optimization of mufflers.Finally, the flow resistance, buffering capacity and acoustic performance of exhaustmuffler and exhaust buffer are analyzed comparatively, and structural optimization isapplied to both of them. The results could provide theoretical reference to improveefficiency, reduce exhaust noise and slow down gas pulsation.