Bearing structure, electric air compressor, dynamic balancing method and assembling method

Abstract

The invention relates to a bearing arrangement (22) for a rotor assembly (1) of an electric air compressor, the rotor assembly (1) comprising a rotor shaft (11) and a bearing portion (12) arranged on the rotor shaft (11), the bearing arrangement (22) together with the bearing portion (12) forming a thrust bearing, the bearing arrangement (22) comprising a first axial section (221) corresponding to the bearing portion (12) and a second axial section (222) axially adjacent to the first axial section (221), the second axial section (222) can be separated from the first axial section (221), and the second axial section (222) is configured to be assembled radially around the rotor shaft (11). The invention also relates to an electric air compressor, a dynamic balancing method and an assembling method. The invention has the advantages that the rotor assembly (1) does not need to be disassembled for mounting the bearing structure (22) after dynamic balancing, and the wear during dynamic balancing is reduced.

Description

technical field [0001] The invention relates to a bearing structure for a rotor assembly of an electric air compressor (EAC, electric air compressor), an electric air compressor including the bearing structure, and a dynamic balance for the rotor assembly of the electric air compressor and a method for assembling an electric air compressor. Background technique [0002] In EAC, the rotational speed of the rotor is very high (usually more than 100,000 rpm), so the rotor needs to be dynamically balanced. The rotor generally includes a rotor shaft and an impeller, wherein the impeller is usually fixed to the rotor shaft by means of washers and nuts. The rotor shaft and the impeller are each well balanced on a dynamic balancing machine. But as far as gaskets and nuts are concerned, even if efforts are made to improve the machining accuracy, the dynamic balance of the entire rotor will still fail to meet the requirements after assembly. Therefore, the entire rotor needs to be ...

AI Technical Summary

Problems solved by technology

[0003] But there is the following problem here: after the dynamic balance, when assembling the whole EAC, since the bearing structure forming the thrust bearing together with the bearing part on the rotor shaft is between the impeller and the bearing part, it is necessary to replace the dynamically balanced The impeller of the rotor is disassembled, and then the bearing structure is placed on the rotor shaft between the impeller and the bearing part, and finally the impeller is assembled

However, the dynamic balance of the entire rotor will be greatly affected by disassembly and reassembly of the impeller

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