A study on the effect of pre-compression system using vibrating nozzle on suction valve behavior of linear compressor

• Published in: Journal of mechanical science and technology 2024, 38(6), , pp.2979-2985
• Main Authors: Jeon, Jae Min, Lee, Young Lim
• Format: Article
• Language: English
• Subjects: Amplitudes; Control; Dynamical Systems; Engineering; Feasibility studies; Industrial and Production Engineering; Mechanical Engineering; Nozzles; Numerical analysis; Optimization models; Original Article; Suction; Vibration; 기계공학
• ISSN: 1738-494X; 1976-3824
• DOI: 10.1007/s12206-024-0518-x

In this study, the feasibility of a pre-compression system using a vibrating nozzle using waste vibration of the compressor body was investigated to improve the performance of an oil-free linear compressor. To this purpose, an optimization model among several vibrating nozzles was first derived through numerical analysis. Then, to verify the pre-compression capability, the effects of the pre-compression system on the pressure increase in the suction chamber and the behavior of the suction valve were experimentally investigated. According to the results of numerical analysis, the pre-compression capability is more affected by the diameter of the vibrating nozzle than the diameter of the fixed nozzle, and the smaller the diameter of the vibrating nozzle, the higher the pre-compression capability. The experimental results also show that the pre-compression pressure increases relatively linearly with the driving motor rpm and amplitude of the vibrating nozzle, so the larger the motor rpm and amplitude, the better the pre-compression capability. On the other hand, the valve displacement initially increased with the driving motor rpm of the vibrating nozzle, reached a peak, then decreased slightly again and it also increased relatively linearly with the amplitude of the vibrating nozzle. The valve displacement observed in the experiment is up to about 0.2 mm at low rpm, which proves that the vibration nozzle has a sufficient pre-compression capability. Therefore, in the future, it is necessary to study the effect of improving the cooling power and EER by implementing the precompression system using the vibration nozzle in the actual compressor.