Rotary Compressor Suction Pipes with Offset L-Bends
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Solution Overview
Problem
Conventional rotary compressors experience increased flow resistance and suction pressure loss due to the configuration of suction pipes, leading to decreased efficiency, especially in high-capacity compressors with variable speed and large refrigerant circulation, and require significant mounting space for large-diameter pipes to reduce pressure loss.
Innovation Solution
The rotary compressor design includes two suction pipes with L-shaped bend parts arranged on different imaginary planes, allowing for increased bend radius without increasing the accumulator diameter or mounting space, using pipes with larger diameters to reduce pressure loss and improve efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a large-diameter suction pipe is used to reduce pressure loss, then the flow resistance decreases and compressor efficiency improves, but the bend radius must be increased which requires larger mounting space
Solution Approach 1:
The suction pipes are arranged in different vertical levels (upper and lower) rather than lying one upon another in the same plane. This spatial reconfiguration in the vertical dimension allows both pipes to have adequate bend radii without increasing the horizontal mounting footprint, thus reducing pressure loss while maintaining compact mounting space.
Solution Approach 2:
The upper suction pipe is positioned to pass through or alongside the lower suction pipe's pathway, with both pipes nested in the vertical space between the accumulator and compressor body. This nesting arrangement充分利用 the vertical space, allowing both pipes to maintain sufficient bend radii without increasing the overall mounting space.
2Volume of moving object
If two suction pipes are laid one upon another vertically in plan view, then the piping structure is compact, but the bend radius of the inner pipe becomes smaller increasing flow resistance
Solution Approach 1:
Instead of arranging both suction pipes in the same horizontal plane (one upon another), the invention positions them at different vertical levels. The upper suction pipe connects to the upper compressing section from above, while the lower suction pipe connects to the lower compressing section from below, giving each pipe sufficient bend radius and reducing flow resistance while maintaining compact overall dimensions.
Data Source
AI summary
In a two-cylinder rotary compressor, two compressing sections accommodated in a compressor body and an accumulator are connected to each other by two suction pipes each formed with an L-shaped bend part in the intermediate pipe part thereof. To reduce a pressure loss caused by the flow resistance of a refrigerant sucked from the accumulator into the compressor, the L-shaped bend parts of the two suction pipes are arranged on different imaginary planes including the center axis line of the compressor body.