Permanent magnet mechanism for scroll compressor and optimization method thereof

By setting a permanent magnet mechanism inside the scroll compressor, the axial force is balanced by the permanent magnet assembly of the moving ring and the stationary ring, thus solving the axial force balance problem of the micro scroll compressor. This achieves a highly reliable and simple axial sealing effect without the need for additional adjustment, thereby improving the performance and long-term reliability of the scroll compressor.

CN117386616BActive Publication Date: 2026-06-12ZHEJIANG UNIV OF SCI & TECH
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
ZHEJIANG UNIV OF SCI & TECH
Filing Date
2023-11-24
Publication Date
2026-06-12

AI Technical Summary

Technical Problem

When a miniature scroll compressor is in operation, the axial force is difficult to balance effectively, resulting in poor or over-sealing of the axial seal, which affects performance and accelerates the wear of the moving and stationary scrolls.

Method used

A permanent magnet mechanism is installed inside the scroll compressor, including a moving ring and a stationary ring. The permanent magnet groups are spaced apart along the axial direction, and the polarities of the permanent magnet groups are opposite. The permanent magnets in each group are axially magnetized in blocks. The inner diameter of the moving ring is larger than that of the stationary ring, and the axial force is balanced by a passive method.

Benefits of technology

It achieves axial force balance without gas, oil or electrical circuits, has a simple and reliable structure, ensures that the scroll machine is not in a sub-sealed state, and improves the working performance and reliability of the scroll machine by optimizing the permanent magnet block scheme to balance the axial gas force.

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Abstract

The application relates to a permanent magnet mechanism for a scroll compressor and an optimization method thereof. The permanent magnet mechanism comprises permanent magnet groups, a dynamic ring and a static ring. The permanent magnet groups are fixed on the static ring in a circumferential direction and face a gas gap. Each permanent magnet group is divided into multiple permanent magnet sub-blocks in a circumferential direction and a radial direction. The inner diameter of the dynamic ring is larger than that of the static ring, the outer diameter of the dynamic ring is smaller than that of the static ring, and when the dynamic ring moves with a dynamic scroll, the projection of the dynamic ring in an axial direction is always enclosed in the projection of the static ring in the axial direction. The optimization method comprises the following steps: performing characteristic analysis on the axial gas force of the scroll compressor to determine a target axial force curve; performing analysis on key parameters of the permanent magnet mechanism; designing a permanent magnet sub-block scheme and performing sensitivity analysis on the optimal sub-block scheme. The permanent magnet mechanism can ensure that the scroll compressor is always in a state of not being under-sealed, effectively provides an axial magnetic force which changes with the rotation angle of a main shaft, and further balances the axial gas force.
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Citation Information

Patent Citations

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