Rotary Compressor Valve Seat Contact Layout for Crack Resistance
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Solution Overview
Problem
In rotary compressors, the valve body is prone to cracking or fatigue due to stress concentration at the inner edge when it collides with the valve seat, leading to reduced compressor efficiency and reliability.
Innovation Solution
The design incorporates annular non-contact regions and a contact region on the valve body, which disperses stress by deforming these areas during collisions with the valve seat and holder, reducing stress concentration and preventing breakage.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the valve body is designed with complete surface contact with the valve seat, then the sealing performance is improved, but stress concentration occurs at the inner edge leading to valve body breakage
Solution Approach 1:
The valve body is designed with different contact characteristics in different regions: the outer peripheral portion and inner peripheral portion have non-contact regions with the valve seat, while only the intermediate portion makes contact. This local differentiation allows the intermediate portion to provide sealing while the outer and inner portions absorb impact energy, preventing stress concentration and valve body breakage.
2Reliability
If the valve body collides with the valve seat to suppress backflow, then the backflow suppression function is improved, but the repeated collision causes stress concentration and fatigue breakage
Solution Approach 1:
The valve body contact surface is segmented into three distinct regions: non-contact regions at the outer and inner peripheral portions that absorb impact energy through deformation, and an intermediate contact region that provides sealing. This segmentation allows the valve body to withstand repeated collisions without fatigue breakage while maintaining backflow suppression functionality.
Solution Approach 2:
The non-contact regions at the outer and inner peripheral portions act as pre-designed cushioning zones that deform during collision to absorb impact energy before it reaches the sealed contact region. This beforehand cushioning prevents stress concentration and extends the valve body's service life under repeated collision conditions.
3Strength
If the valve body is designed with non-contact regions, then stress concentration is reduced preventing breakage, but the sealing mechanism becomes more complex
Solution Approach 1:
The valve body incorporates non-contact regions only at specific locations (outer and inner peripheral portions) while maintaining a simple overall structure. The intermediate portion continues to provide sealing contact with the valve seat. This localized modification enhances strength without significantly increasing structural complexity.
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
This design effectively suppresses valve body breakage by distributing collision energy, ensuring reliable backflow suppression and maintaining compressor efficiency.
Implementation Method 1
The valve body reciprocates between a first position at which the valve body is in contact with the first valve seat and closes the communication path, and a second position at which the valve body is in contact with the second valve seat and opens the communication path, in accordance with a change in the pressure of the compression chamber
Implementation Method 2
respective portions corresponding to the first non-contact region and the second non-contact region are deformed. Accordingly, stress generated at the valve body can be dispersed
Data Source
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AI summary
At least one surface (80a, 80b) of a first surface (80b) and a second surface (80a) of a valve body (80) includes an annular first non-contact region (A1, A4) that is formed in a predetermined range extending radially inward from an outer edge of the valve body (80) and that does not come into contact with a corresponding valve seat (67, 72), an annular second non-contact region (A2, A5) that is formed in a predetermined range extending radially outward from the hole (81) of the valve body (80) and that does not come into contact with a corresponding valve seat (67, 72), and a contact region (A3, A6) that is formed between the first non-contact region (A1, A4) and the second non-contact region (A2, A5) and that comes into contact with a corresponding valve seat (67, 72).