Rotary Compressor Injection Pipe Routing for Welding Access
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Solution Overview
Problem
Rotary compressors face fluctuations in compression efficiency due to varying inlet amounts of liquid refrigerant during injection, and the proximity of the injection pipe to the accumulator complicates welding operations, risking tool contact and heat interference.
Innovation Solution
The rotary compressor design includes an injection hole positioned within a fan-like range of 40° or less relative to the connection position between the compressor housing and the inlet unit, and an injection pipe taking-out portion on the compressor housing, allowing for controlled liquid refrigerant injection and improved welding workability by separating the injection connecting pipe from the accumulator.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the injection pipe is disposed near the connection position between the compressor housing and the inlet pipe to improve injection timing, then compression efficiency is improved, but the welding tool is likely to come into contact with the accumulator and welding work is interrupted
Solution Approach 1:
The injection connecting pipe is extended in the axial direction (vertical dimension) rather than only in the circumferential direction. By making the pipe extend axially from the injection pipe taking-out portion toward the upper portion of the compressor housing, the connection position is moved to a different spatial dimension where it does not interfere with the accumulator located in the lower portion, thus resolving the welding accessibility issue while maintaining injection efficiency
Solution Approach 2:
The injection connecting pipe is divided into multiple sections with different orientation characteristics. One section extends in the circumferential direction from the injection pipe taking-out portion, while another section extends in the axial direction toward the upper portion of the compressor housing. This segmentation allows the pipe to navigate around the accumulator and achieve both good injection timing and welding accessibility
2Ease of manufacture
If the injection connecting pipe is extended to the upper portion of the compressor housing to improve welding accessibility, then welding workability is improved, but the injection timing may be affected
Solution Approach 1:
The injection connecting pipe is designed with flexible routing that combines circumferential and axial extensions. The pipe can adapt its path to maintain optimal injection timing while providing accessible connection points for welding operations in the upper portion of the compressor housing
Solution Approach 2:
The injection pipe taking-out portion serves as an intermediary connection point on the outer circumferential surface of the compressor housing. This intermediate location allows the injection connecting pipe to connect to the injection pipe while maintaining both good injection timing and accessibility for welding operations
3Productivity
If the injection pipe is positioned to optimize liquid refrigerant injection timing, then compression efficiency is improved, but heat from welding may influence the accumulator
Solution Approach 1:
The injection connecting pipe connection is extracted from the lower circumferential region near the accumulator and relocated to the upper portion of the compressor housing. This separation removes the welding operation from proximity to the accumulator, eliminating heat interference while maintaining optimal injection timing through the pipe's routing design
Data Source
AI summary
A compressor includes: an annular cylinder; a rotation shaft which is rotated by the motor; a piston which revolves along an inner circumferential surface of the cylinder, and forms a cylinder chamber on the inside of the cylinder; a vane which protrudes to the inside of the cylinder chamber from a vane groove provided in the cylinder, and divides the cylinder chamber into an inlet chamber and a compression chamber by abutting against the piston; and an injection hole which injects a liquid refrigerant to the inside of the compression chamber. The center of the injection hole is disposed to be within a fan-like range of which a center angle is equal to or less than 40° toward a side opposite to a connection position between the compressor housing and the inlet unit from a center line of the vane groove in the circumferential direction of the rotation shaft.