Experimental and numerical study on the dynamic and lubrication characteristics of the rotor-bearing-frame system in a variable-speed scroll compressor

Author:

Wang Che1ORCID,Zhong Hua1,Zhang Shuai1ORCID,Cheng Junming23,Wu Jianhua1

Affiliation:

1. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an, PR China

2. Guangdong Midea Environmental Technologies Co., Ltd, Shunde, PR China

3. Guangdong Meizhi Compressor Co., Ltd, Shunde, PR China

Abstract

The variable-speed scroll compressors can adapt to the various demands of heating and cooling capacity, and the rotational speeds significantly influence the rotor dynamic and bearings lubrication, which might cause performance and reliability issues. In this paper, numerical models for the rotor-bearing-frame system are developed by coupling the Reynolds equation, rotor dynamic equation, and the flexibility equation of the frame. The experimental apparatus is also established to directly measure the journal displacement response in the hermetic high-pressure shell of the compressor. The predicted journal center trajectories are compared with the experimental results and they show good agreement. Results show that the whirl radius decreases with the increase of rotational speed at the measuring point, while the opposite tendency can be observed at the bottom of the main bearing. Transient dynamic analysis of the rotor shows that the tilting and deformation of the rotor vary with respect to different rotational speeds. The displacement of the crank part could lead to the separating tendency between orbiting and fixed scrolls through the coupled orbiting bearing, especially at the lower rotational speed, due to the pull of main balance weight. The numerical results also reveal that the distribution of oil film pressure is dominated by the squeeze effect due to the relatively stable magnitude but the variable direction of loads on the shaft. The influence of the deformation of the cantilevered bearing frame on the oil film thickness is significant but the maximum deformation moves downward at the higher rotational speed.

Funder

Shunde District Core Technology Research Project

Publisher

SAGE Publications

Cited by 1 articles. 订阅此论文施引文献 订阅此论文施引文献,注册后可以免费订阅5篇论文的施引文献,订阅后可以查看论文全部施引文献

1. Transient multibody tribo-dynamics analysis of the orbiting scroll in a three-bearing scroll compressor;Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology;2024-04-24

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