Linear Compressor Recess Curvature for Piston Stability
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Solution Overview
Problem
Linear compressors face issues with reduced rigidity of the cylinder recess, leading to weakened levitation force and potential collisions between the piston and cylinder due to vortex generation and decreased pressure differences.
Innovation Solution
The design incorporates a cylindrical cylinder with a gas inlet and supply port, featuring a recess with specific angular and volumetric configurations to reduce vortex generation, increase the minimum gap between the piston and cylinder, and enhance internal pressure, thereby stabilizing the piston's support and preventing collisions.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Ease of manufacture
If the recess of the cylinder is designed with a rectangular cross-section, then the manufacturing is simple, but the rigidity of the recess is reduced and vortex generation increases
Solution Approach 1:
The recess cross-section is designed with curved surfaces instead of rectangular shapes. Specifically, the recess has a circular or arc-shaped cross-section that tapers toward the bottom, which significantly improves rigidity and reduces vortex generation while maintaining manufacturability through standard machining operations.
2Force
If the recess volume is increased to improve levitation force, then the levitation force increases, but the rigidity of the recess structure decreases
Solution Approach 1:
The recess design implements local quality by concentrating the volume increase in specific regions. The upper portion of the recess has a larger cross-sectional area to generate sufficient levitation force, while the lower portion tapers to a smaller area, maintaining structural rigidity. This non-uniform distribution optimizes both force generation and structural strength.
3Reliability
If the gap between piston and cylinder is increased to prevent collisions, then collision prevention improves, but the levitation force is weakened
Solution Approach 1:
The solution addresses the gap issue by introducing a third dimension - the axial length of the recess. Instead of simply increasing the radial gap, the design extends the recess axially to create a longer gas cushion region. This allows maintaining a smaller radial gap for sufficient levitation force while preventing collisions through the extended axial clearance.
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 configuration improves the rigidity of the recess, increases the levitation force, and prevents collisions by efficiently reducing vortex generation and enhancing internal pressure, leading to a more reliable and stable operation of the linear compressor.
Implementation Method 1
since a vortex was generated in the recess 145, there was a problem that rigidity of the recess 145 was reduced. Further, since an internal pressure of the recess 145 was reduced, there was a problem that a levitation force of a piston 150 with respect to the cylinder 140 was weakened.
Data Source
AI summary
A linear compressor includes a cylinder that defines a compression space of a refrigerant and has a cylindrical shape, and a piston disposed in the cylinder and reciprocating along an axis of the cylinder. The cylinder includes a gas inlet formed on an outer circumferential surface of the cylinder, a supply port radially passing through the cylinder and communicating with the gas inlet, and a recess communicating with the supply port and formed on an inner circumferential surface of the cylinder. An angle formed by an axial cross section of the recess and a straight line extending the supply port and an angle formed by the axial cross section of the recess and a straight line extending the inner circumferential surface of the cylinder each are an acute angle.