Theoretical and experimental study on coil spring for linear compressor

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Journal of Vibration and Shock ›› 2023, Vol. 42 ›› Issue (10) : 314-322.

CHEN Hongyue1， LIU Xianyang1， L Zhangquan1,2， ZOU Xianfeng1

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Abstract

Resonance system is the key component to realize the reciprocating operation of linear compressor, while the plate spring used in Stirling refrigerator has low axial stiffness, high cost, and is prone to fatigue fracture under large amplitude, and is not suitable for civil refrigeration field with large refrigeration capacity. To solve the above problems, a cylindrical arm helical coil spring (hereinafter referred to as the coil spring) is designed, and the theoretical models of axial and radial stiffness of coil spring are developed based on the energy conservation method and the Mohr integral method, respectively. The error of theoretical model is verified to be less than 6.88%. The dynamic magnetic linear compressor equipped with a coil spring is tested. The results show that the designed coil spring can maintain the constant axial stiffness during the dynamic operation of the compressor, and can play a radial support role for the piston to a certain extent, so that the damping ratio between the piston and the cylinder is 0.1047. Finally, compared the flexure spring with the coil spring with the same outer diameter, the natural frequency of the coil spring is 1.56 times that of the plate spring, and the maximum equivalent stress can be reduced by 41.2%. The maximum allowable amplitude of coil spring is 1.53 times greater than that of plate spring for the same fatigue life, verifying that the application of coil spring in linear compressor is feasible.

Key words

Linear compressor / Resonance system / Coil spring / Dynamic characteristics

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CHEN Hongyue1， LIU Xianyang1， L Zhangquan1,2， ZOU Xianfeng1. Theoretical and experimental study on coil spring for linear compressor[J]. Journal of Vibration and Shock, 2023, 42(10): 314-322

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