Rotary compressor
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Solution Overview
Problem
The arrangement of the injection hole near the upper and lower discharge holes in rotary compressors is challenging due to the presence of through holes for bolt fixation and refrigerant passages, making it difficult to optimize the placement of the injection hole for efficient refrigerant injection.
Innovation Solution
A rotary compressor design where the injection hole is positioned near the upper and lower discharge holes by forming the injection passage along a straight line that does not cross the rotary shaft insertion hole, allowing for efficient refrigerant injection and improved compression efficiency.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the injection hole is arranged near the upper discharge hole and lower discharge hole, then refrigerant injection efficiency is improved, but the arrangement is blocked by through holes for bolt fixation and refrigerant passages
Solution Approach 1:
The injection passage is configured to extend in the axial direction of the rotary shaft, utilizing the third dimension (axial direction) to bypass the conflict with through holes in the radial plane. This dimensional transition allows the injection hole to be positioned near the discharge holes without interfering with bolt fixation holes and refrigerant passages that are arranged in the radial direction.
Solution Approach 2:
The intermediate partition plate is divided into multiple functional regions: a central region for the rotary shaft insertion hole, an outer region for bolt fixation through holes, and a radial region for refrigerant passages. The injection passage is positioned in the axial direction, segmenting the space usage and avoiding overlap with other components.
2Reliability
If the injection passage is arranged avoiding through holes, then structural integrity is maintained, but the injection hole cannot be positioned near discharge holes
Solution Approach 1:
By transitioning from radial arrangement to axial arrangement, the injection passage finds a new spatial pathway that does not compromise the structural integrity maintained by radially positioned through holes, while achieving optimal positioning near discharge holes for improved injection efficiency.
3Ease of manufacture
If through holes are arranged near discharge holes for fixing members, then assembly is simplified, but injection hole placement becomes difficult
Solution Approach 1:
The intermediate partition plate is segmented into distinct functional zones: through holes for assembly fixation are positioned in the radial direction, while the injection passage occupies the axial direction. This spatial segmentation allows both assembly simplicity and injection hole placement to be optimized without conflict.
Solution Approach 2:
The injection passage utilizes the axial dimension to bypass the radial arrangement of through holes, allowing through holes to be conveniently positioned for assembly while the injection hole maintains optimal positioning near discharge holes.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
Enables the injection hole to be arranged optimally near the discharge holes, enhancing refrigerant injection efficiency and reducing noise and heat loss, thereby improving the overall performance of the compressor.
Implementation Method 1
an injection passage (140a) that supplies the liquid refrigerant to the injection hole (140b)
Implementation Method 2
compress the refrigerant
Data Source
AI summary
A compression part of a rotary compressor includes an intermediate partition plate that is arranged between an upper cylinder and a lower cylinder, an upper vane that sections an upper cylinder chamber formed within the upper cylinder into an upper suction chamber and an upper compression chamber, and a lower vane that sections a lower cylinder chamber formed within the lower cylinder into a lower suction chamber and a lower compression chamber. The intermediate partition plate is formed with an injection hole that injects a liquid refrigerant into the upper compression chamber and the lower compression chamber and an injection passage that supplies the liquid refrigerant to the injection hole. The injection passage is formed along a straight line that does not cross a rotary shaft insertion hole into which a rotary shaft is inserted.