Abstract: As a core part of the remanufactured centrifugal compressor, the remanufactured impeller has characteristics of special structure, high speed and complex load. The three-dimensional characteristic modeling of remanufactured impeller provides a basis or carrier for the subsequent finite element analysis, service loads solving, service safety analysis, remanufacturing process optimization, et al. However, impeller original three-dimensional model often lack or the existing models cannot reflect the impeller’s remanufactured characteristics, so it is difficult to directly be applied to the simulation analysis of impeller. Based on the measurement points of the structural characteristics and the NURBS curve and surface theory, a reconstruction method of remanufactured impeller geometric features is presented. In the case application, three-dimensional model of a certain type of remanufactured impeller is established by this method, and the geometric quality is assessed. The results show that the geometric model of remanufactured impeller reconstructed by the above-mentioned method has smaller deviation (1×10–4 mm), higher smoothness. Meanwhile, this model is consistent with the real impeller and meets the impeller remanufacturing process. The model provides basic information for the service loads solving, remanufacturing process residual stress analysis, and service life prediction of the remanufactured impeller of centrifugal compressor during next service.

Key words: centrifugal compressor;remanufacturing impeller;structure characteristics;3D modeling