Rotary Compressor Blade Hole Deformation Prevention
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Solution Overview
Problem
Conventional compressors experience deformation of the blade hole due to press-fitting, leading to abnormal wear and seizure, which affects the refrigeration apparatus's reliability.
Innovation Solution
The compressor design includes a pipe connection member with a press-fitting portion positioned at a distance from the cylinder's center that is equal to or greater than the distance to the blade hole's outer end, along with a valve structure in the suction passage to regulate refrigerant flow, preventing backflow and improving refrigerating capacity.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If the press-fitting portion is positioned close to the center for compact design, then the device complexity is reduced, but the blade hole deforms causing abnormal wear and seizure
Solution Approach 1:
The patent transitions from considering only radial positioning to incorporating axial positioning (distance from center point along the axial direction) as an additional dimension. By specifying that the axial distance from the center point to the press-fitting portion is equal to or greater than the radial distance to the blade hole's outer end, the design protects the blade hole from deformation while maintaining structural compactness through precise spatial arrangement.
2Reliability
If the press-fitting portion is positioned far from the center to avoid blade hole deformation, then the reliability is improved, but the device complexity increases
Solution Approach 1:
The patent changes the positioning parameters of the press-fitting portion by specifying precise distance relationships: the axial distance from the center point must be equal to or greater than the radial distance to the blade hole's outer end. This parameter-based approach ensures reliable blade hole protection while maintaining structural simplicity through optimized geometric relationships rather than complex additional components.
3Productivity
If the suction passage is configured to allow intermediate-pressure refrigerant flow, then the refrigerating capacity is improved, but the device complexity increases due to valve structure
Solution Approach 1:
The suction passage is designed with multi-functionality: it serves both as a structural connection element and as a flow control pathway. By configuring the suction passage to allow intermediate-pressure refrigerant flow directly, the patent achieves enhanced refrigerating capacity without adding separate complex valve structures, as the suction passage itself performs multiple functions including flow guidance and pressure regulation.
Data Source
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AI summary
A compressor includes a cylinder (101); a cylinder chamber (103); a piston turning along an inner peripheral surface (101a) of the cylinder (101); a blade that partitions the cylinder chamber (103) into a high pressure side region and a low pressure side region together with the piston; a blade hole (104) allowing the blade to advance and retract; a suction passage (120) that extends from an outer peripheral surface of the cylinder (101) to the inner peripheral surface (101a) of the cylinder (101) and guides a refrigerant to the cylinder chamber (103); and a pipe connection member (200) having a press-fitting portion (201b) press-fitted into the suction passage (120) from a radially outer side of the cylinder (101). A distance (R2) from a center point (O1) of the cylinder chamber (103) to the press-fitting portion (201b) is equal to or longer than a distance (R1) to a radially outer end of the blade hole (104).