Double-cylinder rotary compressor eccentrically assembling method

Abstract

An eccentrical assembling method for dual-cylinder rotary compressor includes assembling upper cylinder with its cover, assembling lower cylinder with its cover, centralizing them, fixing with screw bolts to obtain assemblies M and N, fixing M, mounting crankshaft, the first piston, intermediate plate and the second piston, putting N on it, regulating the position of upper cylinder cover, prefixing both cylinders, detaching lower cylinder cover, mounting two fixing screws, measuring the eccentrical gap between N, the second piston and crankshaft, mounting lower cylinder cover, and mounting silencer. Its advantages are high precision and high performance of compressor.

Description

technical field [0001] The invention relates to an eccentric assembly method of a double-cylinder rotary compressor, in particular to an assembly method of a cylinder of a double-cylinder rotary compressor with two eccentric crankshafts with a phase difference of 180°. Background technique [0002] Generally speaking, the main part of the rotary compressor pump body is composed of crankshaft, piston and cylinder. The assembly clearance in the compressor pump body directly affects the leakage from the high pressure chamber inside the compressor to the low pressure chamber. The leakage includes three types: leakage of the eccentric clearance (the gap between the outer diameter of the piston and the inner diameter of the cylinder); leakage of the vane groove clearance; and leakage of the clearance in the height direction of the cylinder and piston vanes. Among the three, the leakage of the eccentric clearance accounts for a large proportion, so controlling the eccentric clearan...

AI Technical Summary

Problems solved by technology

[0016] 1. The method is complicated, and there are many processes. A total of 3 eccentric adjustments are required, and the investment in equipment is relatively large (3 eccentric machines are required)

[0017] 2. Due to the mutual position between the screwed parts after each alignment, there is also a certain error in the shaft center, so the quality of the compressor is also unstable, resulting in a reduction in displacement and mechanical loss, resulting in a very high output power required. Big

[0018] 3. It is difficult to adjust the center, and it takes time to assemble

[0026] 1. The assembly of the lower cylinder and the lower cylinder head may become loose during the assembly of the pump body, and the eccentric gap may change, so that the eccentric parts may not meet the required precision requirements

[0027] 2. After the assembly of the pump body is completed, because the eccentric clearance cannot be measured, those pump body components that do not meet the precision requirements flow into the next manufacturing process, resulting in substandard products

At this time, the special lower cylinder head is no longer an ordinary lower cylinder head, but only used as a fixture, so it is impossible to perform performance tests on the finished compressor

If it is replaced with an ordinary lower cylinder head, the original eccentric gap will change again, and the eccentric gap after replacement cannot be measured, making this eccentric part that loses precision meaningless

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