Abstract

Bladder accumulator is a common buffer element in hydraulic oil circuits, it would abnormally deform during decompression on occasion, resulting in a liquid-trapped phenomenon. In order to investigate the mechanism of this unusual phenomenon, firstly, an experimental study focused on the deformation state of the rubber balloon of bladder accumulator was conducted. Secondly, according to the actual working load conditions of the bladde accumulator, a self-compiled VDLOAD user subroutine was used for loading, and the nonlinear post-buckling analysis of the rubber balloon was performed by displacement perturbation method based on the buckling mode. Finally, influences of the pressure in the balloon cavity on the post-buckling deformation of the rubber balloon were explored. The results show that the oil-trapped deformation of the rubber balloon experiment is in good agreement with the post-buckling analyzed deformation state. It is concluded that the oil-trapped phenomenon of the bladde accumulator is due to the buckling instability deformation of three pits on the premise of the uniform hydraulic distribution. In addition, the gas pressure in the balloon cavity affects the post-buckling deformation mode of the rubber balloon. Within the design pressure range, the oil-trapped phenomenon can be avoided by reducing the pressure in the rubber balloon cavity.

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