Scroll Compressor Pin-and-Hole Rotation Inhibitor
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Solution Overview
Problem
In scroll-type fluid machines, the concentration of rotational moment on rotation-inhibiting parts can lead to damage, and existing designs do not adequately address the variation in rotational moment when the spiral wrap center is eccentric to the bottom plate center, affecting durability and size reduction.
Innovation Solution
A scroll-type fluid machine with a rotation-inhibiting mechanism featuring at least three pin-and-hole type parts, where one part is arranged on a straight line perpendicular to the line connecting the bottom plate center and the spiral center of the movable scroll, distributing the load of the rotational moment effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Volume of moving object
If the spiral wrap center is made eccentric to the bottom plate center to reduce the body diameter, then the size of the scroll-type fluid machine is reduced, but the rotational moment varies depending on the turning position and concentrates on one rotation-inhibiting part, causing pin damage
Solution Approach 1:
The patent applies asymmetry by deliberately positioning the spiral wrap center eccentrically relative to the bottom plate center. This asymmetric arrangement enables compact sizing while the patent compensates for the resulting uneven rotational moment distribution through specific arrangement of multiple rotation-inhibiting parts around the movable scroll's circumferential direction
Solution Approach 2:
The patent divides the rotation-inhibiting function into multiple separate rotation-inhibiting parts (at least three) arranged circumferentially around the movable scroll. Each part comprises pins engaged with circular holes, distributing the rotation-inhibiting function across multiple locations to prevent concentration of rotational moment on a single part, thereby maintaining reliability while allowing eccentric configuration for size reduction
2Reliability
If multiple rotation-inhibiting parts are arranged to distribute the load, then the durability is improved, but the structural complexity increases
Solution Approach 1:
The rotation-inhibiting mechanism is segmented into multiple identical or similar rotation-inhibiting parts arranged circumferentially. Each part has a simple pin-and-hole structure, but their collective arrangement provides load distribution. This segmentation approach maintains individual component simplicity while achieving system-level reliability through redundancy and load sharing
Solution Approach 2:
The patent applies local quality by making different rotation-inhibiting parts have different functional characteristics based on their positions. Specifically, at least one rotation-inhibiting part is positioned such that its circular hole center lies on a straight line perpendicular to the line connecting the bottom plate center and spiral center, optimizing load distribution at critical locations while other parts provide supplementary support
Data Source
AI summary
A scroll-type fluid machine including: a scroll unit (4) having a fixed scroll (2) and a movable scroll (3) in which a bottom plate center (3c) and a wrap spiral center (3d) are made eccentric; and a rotation-inhibiting mechanism (30) with multiple rotating-inhibiting parts (33), each part (33) being composed of a circular hole (31) and a pin (32), wherein the rotation-inhibiting mechanism (30), a straight line A connecting the bottom plate center (3c) and the wrap spiral center (3d) is rotated on the bottom plate center by 90° in a direction opposite to a wrapping direction of the wrap (3b), a point at which the rotated straight line A intersects a pitch circle is set as a center position of one of the rotation-inhibiting parts (33), the other rotation-inhibiting parts (33) are arranged on the pitch circle at even intervals based on one of the rotation-inhibiting part (33).