Asymmetric Piston Sliding Surface for Compressor Wear Reduction
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Solution Overview
Problem
Conventional compressors in home-use refrigerator freezers experience unsymmetrical wear at low operation speeds, leading to refrigerant leakage and instability, which complicates maintaining operational reliability and increases manufacturing costs due to the complexity of anti-wearing measures.
Innovation Solution
The compressor design enhances sliding-contact surface area at the compression load side compared to the anti-compression load side, increasing fluid friction resistance to counteract the piston's oscillation moment, thereby maintaining a straight piston posture and preventing unsymmetrical wear.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If conventional compressor design is used, then manufacturing cost is reduced, but unsymmetrical wear occurs at low operation speeds leading to reliability deterioration
Solution Approach 1:
The piston is designed with asymmetric sliding-contact surface areas where the compression load side has a larger surface area than the anti-compression load side. This asymmetric design creates unequal fluid friction forces that counteract the oscillation moment caused by connection structure friction, thereby preventing unsymmetrical wear and maintaining piston straightness at low operation speeds without adding complex mechanical structures.
Solution Approach 2:
The invention applies different surface area characteristics to different local regions of the piston. Specifically, the sliding-contact surface area is made larger at the compression load side and smaller at the anti-compression load side. This local differentiation allows the piston to naturally balance forces during operation, preventing wear without requiring additional components or complex mechanisms.
2Reliability
If anti-wearing measures are implemented, then unsymmetrical wear is prevented, but manufacturing cost increases due to structural complexity
Solution Approach 1:
Instead of adding complex mechanical anti-wear structures, the invention uses asymmetric surface area design of the piston to create self-balancing friction forces. This approach prevents unsymmetrical wear through fluid friction alone, avoiding the need for additional wear-resistant components or complex manufacturing processes, thereby maintaining ease of manufacture while improving wear resistance.
3Stability of the object's composition
If piston sliding-contact surface area is increased at compression load side, then fluid friction resistance increases to counteract oscillation moment, but power consumption may increase
Solution Approach 1:
The asymmetric surface area design creates a natural balance where the increased fluid friction at the compression load side counteracts the oscillation moment, stabilizing piston posture without requiring excessive friction throughout the entire piston surface. The anti-compression load side maintains smaller surface area, reducing unnecessary friction and power consumption during that phase of operation.
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 ensures high reliability compressors at lower costs by preventing unsymmetrical wear, stabilizing performance at low speeds, and reducing power consumption, with improved efficiency and reduced refrigerant leakage.
Implementation Method 1
a surface area of sliding-contact formed between the piston and the cylinder bore is made to be greater at the compression load side than that at the anti-compression load side; thus, the sliding resistance due to fluid friction at the compression load side is increased
Data Source
AI summary
A compressor which includes a piston (150) reciprocating in a cylinder bore (111) provided in a cylinder block. Length of the circumferential surface at the compression load side (160) is made to be longer than that at the anti-compression load side (170), so that area of sliding-contact surface at the compression load side is greater than that at the anti-compression load side. The above configuration is effective to prevent occurrence of wearing due to unsymmetrical contact of piston with cylinder bore. Thus, deterioration in the refrigeration capability and instability of the performance is prevented.