Scroll Compressor Wrap Offset Section Design
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Solution Overview
Problem
Scroll compressors are vulnerable to deformation and damage due to centrifugal force, leading to efficiency and credibility issues, as the orbiting and fixed wraps are subjected to thermal expansion and pressure, causing friction loss and wear, particularly in sections with large contact surface areas and small thickness.
Innovation Solution
An offset section is formed in the scroll compressor where the surface area of contact between the orbiting and fixed wraps is largest within a specific crank angle range to minimize deformation and damage from centrifugal force, improving efficiency and reducing manufacturing costs by targeting only the most vulnerable areas for offset processing.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If offset parts are formed in sections with large contact surface areas and small thickness to prevent thermal deformation, then friction loss and wear are reduced, but the wraps become more vulnerable to deformation and damage from centrifugal force
Solution Approach 1:
The patent applies local quality by forming offset parts only in specific sections of the wraps where contact surface area is large and thickness is small. This localized modification prevents thermal deformation and friction loss in critical areas without compromising the overall structural integrity of the wraps against centrifugal force.
Solution Approach 2:
The patent uses partial action by applying offset parts only to specific sections of the wraps rather than the entire length. This targeted approach addresses the most vulnerable areas (large contact surface, small thickness) while maintaining wrap strength in other sections to resist centrifugal force during high-speed orbital movement.
2Loss of energy
If offset parts are formed in sections with large contact surface areas to prevent thermal deformation, then friction loss is reduced, but manufacturing complexity increases due to selective offset processing
Solution Approach 1:
The patent defines specific sections of the wraps where offset parts should be formed based on contact surface area and thickness characteristics. This localized approach reduces friction loss in critical areas while providing clear manufacturing guidelines that simplify the offset processing procedure compared to comprehensive offset processing.
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 solution effectively minimizes deformation and damage to the wraps, enhancing the efficiency and credibility of the scroll compressor by distributing centrifugal force more evenly and preventing excessive wear, while optimizing manufacturing processes by focusing offset processing on critical areas.
Implementation Method 1
centrifugal force concentrates on a portion in which a surface area of contact between the orbiting wrap 332 and the fixed wrap 323 is large
Implementation Method 2
an orbiting scroll or a fixed scroll may be deformed and damaged due to thermal expansion or thermal pressure
Data Source
AI summary
A scroll compressor includes a casing; a drive motor; a rotary shaft; a fixed scroll including a fixed wrap; and an orbiting scroll eccentrically coupled to rotary shaft and including an orbiting wrap configured to engage with the fixed wrap. At least one of the fixed wrap or the orbiting wrap defines an offset section that is defined between the fixed wrap and the orbiting wrap and that is greater than an orbital radius corresponding to a distance between the fixed wrap and the orbiting wrap in a state in which a center of the fixed scroll is aligned to a center of the orbiting scroll. The offset section is disposed at a contact portion between the fixed wrap and the orbiting wrap. The contact portion has a maximum length based on a rotation angle of the rotary shaft being within a pre-set range with respect to a reference point.