Assembling method of connecting rod and bearing shell of compressor

Abstract

The invention discloses an assembling method of a connecting rod and a bearing shell of a compressor. The connecting rod and the bearing shell are included. The assembling method includes the following steps that the bearing shell is machined according to the external diameter interference magnitude of 0.08 mm-0.12 mm, then the bearing shell is soaked in liquid nitrogen to be cooled for 2 min-5 min, the bearing shell is taken out and immediately put in the small end of the connecting rod, the bearing shell stands still at room temperature, and after the bearing shell is restored to the room temperature, the bearing shell can be mounted in the small end of the connecting rod in an interference fit manner. Based on the principle of heat expansion and cold contraction, the external diameter machining interference magnitude of the bearing bush is increased, the bearing shell is soaked in the liquid nitrogen to be cooled, the external diameter of the bearing shell is reduced, the bearing shell can be easily put in the small end of the connecting rod, the bearing shell is restored to the original shape after standing still at the room temperature, the bearing shell and the small end of the connecting rod tightly expand together, no gap is left, and the assembling effect is good. The assembling method is simple and easy to operate, the service life of the connecting rod and the bearing shell which are assembled can reach 18 months or longer, the service life is long, and the maintenance frequency and the corresponding maintenance cost can be reduced. The strength of the connectingrod is guaranteed, the assembling method is economical and rapid, and therefore the production cost is reduced.

Description

technical field [0001] The invention belongs to the technical field of compressor equipment, and in particular relates to an assembly method of a compressor connecting rod bearing shell. Background technique [0002] Since the bearing bush of the compressor is continuously subjected to alternating loads, the quality of its assembly with the small end of the connecting rod is very important while it is in clearance fit with the crosshead pin. [0003] The existing method for installing the connecting rod bearing bush of a compressor is generally as follows: measure the inner diameter of the small end of the connecting rod, process the bearing bush according to an interference of 0.04-0.08mm, and then drive the bearing bush into the small end of the connecting rod. This installation method requires that the ellipticity of the inner circle of the small head of the connecting rod is ≤0.08mm, otherwise a local gap will be formed. However, the actual deformation of the small head...

AI Technical Summary

Problems solved by technology

[0004] In order to reduce the production cost and fully recycle the undamaged connecting rod, the existing processing method generally adopts the processing of the small end of the connecting rod, processing the inner circle of the small end of the deformed connecting rod into a circle with an ellipticity ≤ 0.08mm, and then the outer surface of the bearing bush Correspondingly, the diameter is increased, and it is inserted into the small end of the connecting rod for repeated use, but the strength of the small end of the connecting rod will decrease after repeated processing, and the processing process is cumbersome, which is not conducive to production

Images