Thrust Receiving Mechanism for Scroll Compressor Posture Stability
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Solution Overview
Problem
In scroll compressors, the movable scroll's eccentric rotation becomes unstable due to dynamic pressure changes and tilting, leading to frictional forces and displacement issues, which affect the compression efficiency and stability.
Innovation Solution
A thrust receiving mechanism with dynamic pressure generation portions and pressing portions that follow the movable scroll's displacement and tilting, ensuring stable eccentric rotation by generating balanced dynamic pressures.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Loss of energy
If a ring-shaped plate thrust bearing is used to support the movable scroll, then frictional force is reduced through dynamic pressure generation, but the movable scroll becomes unstable and prone to tilting when dynamic pressure changes occur
Solution Approach 1:
The thrust bearing is divided into multiple independent bearing mechanisms (first, second, third, and fourth bearing mechanisms) arranged at different positions around the movable scroll. Each bearing mechanism independently generates dynamic pressure to support the movable scroll, distributing the load and improving stability while reducing frictional force.
2Productivity
If the movable scroll is pressed against the fixed scroll by refrigerant, then leakage is reduced and compression efficiency is increased, but axial position displacement occurs due to pressure difference changes
Solution Approach 1:
The thrust bearing uses a dynamic pressure generation mechanism where the movable scroll's eccentric rotation relative to the fixed scroll creates varying pressure zones. The bearing mechanisms are positioned to exploit this dynamic motion, generating hydrodynamic pressure that automatically adjusts to maintain stable axial position while allowing the necessary compression function to occur.
3Stability of the object's composition
If dynamic pressure generation portions are made movable to follow the movable scroll, then stability is improved during displacement, but device complexity increases
Solution Approach 1:
The bearing mechanisms utilize the movable scroll's own eccentric rotation motion to generate dynamic pressure. The relative motion between the movable and fixed scrolls automatically creates the pressure differential needed for support, without requiring additional active control mechanisms or complex adjustment systems.
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
The mechanism stabilizes the movable scroll's posture relative to the fixed scroll, reducing frictional forces and maintaining efficient eccentric rotation, even with axial position changes or tilting.
Implementation Method 1
configured for generating a dynamic pressure on the back surface of the movable scroll
Implementation Method 2
the ring-shaped plate can reduce a frictional force generated when the movable scroll rotates
Implementation Method 3
pressing portions that press the dynamic pressure generation portions
Implementation Method 4
a movable scroll that slides relative to a fixed scroll while rotating eccentrically
Data Source
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AI summary
There is provided a thrust receiving mechanism that allows a movable scroll to rotate eccentrically in a stable manner in a state where the movable scroll maintains the posture with respect to a fixed scroll. A thrust receiving mechanism 8 is provided on a back surface of a movable scroll 42 that slides relative to a fixed scroll 41 while rotating eccentrically, and is configured for generating a dynamic pressure on the back surface of the movable scroll 42, and the thrust receiving mechanism 8 includes a plurality of dynamic pressure generation portions 80 and pressing portions 81 that press the dynamic pressure generation portions 80.