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Vane slot deformation research of rotary compressor in accumulator welding process.

Number: pap. 1297

Author(s) : ZHENG L., CAO H., ZHU B., et al.

Summary

Generally, the accumulator in the rotary compressor is connected to the main case by welding, which is space-saving and of high reliability, while huge deformation of the cylinder’s vane slot induced by the heat during the welding process can reduce reliability and COP (coefficient of performance) of compressor significantly. Welding is a complex process including combustion, heat transfer, structure deformation, and so on. In this paper vane slot deformation in the accumulator welding process was studied by both simulations and experiments. Firstly, the oxyacetylene flame was simulated by using CFD, and a validation test rig was developed to obtain temperatures at various locations in the centerline of the jet flame. The CFD result compares well with the experimental data. Secondly, heating transfer in the accumulator welding process was simulated to get the temperature distribution of the compressor. The temperature distribution of the case was tested by thermocouples, and the simulation results agreed well with the experimental data. Thirdly, a combustion-heat transfer-structure deformation coupling simulation model was established to get the deformation of vane slot, and the predicted results also coincided with the experimental data. Finally, based on the reliable simulation model, the mechanism of deformation was analyzed, which revealed that the key factor of deformation is the difference of temperature between the taper pipe and the case pipe during the welding process. Then the design was improved by shortening the case pipe to increase the heating area of taper pipe. And the deformation of vane slot almost disappeared, which was confirmed by simulation and experiment simultaneously. The fact of improvement ensured the rationality of the simulation model and the mechanism of vane slot deformation again.

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Pages: 7

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Details

  • Original title: Vane slot deformation research of rotary compressor in accumulator welding process.
  • Record ID : 30024278
  • Languages: English
  • Source: 2018 Purdue Conferences. 24th International Compressor Engineering Conference at Purdue.
  • Publication date: 2018/07/09

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