A radial adjustment and temperature change responsive seal

CN122106929AActive Publication Date: 2026-05-29NORTHWESTERN POLYTECHNICAL UNIV
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Patent Information

Authority / Receiving Office
CN · China
Patent Type
Applications(China)
Current Assignee / Owner
NORTHWESTERN POLYTECHNICAL UNIV
Filing Date
2026-04-24
Publication Date
2026-05-29

AI Technical Summary

Technical Problem

The compressor's toothed rotor and stationary casing undergo inconsistent radial deformation due to thermal load disturbances, leading to fluctuations in the sealing gap, contact wear, and even seal failure.

Method used

The sealing structure is radially adjustable and responds to temperature changes. It includes an arc-shaped seal, a reset assembly, a transmission component, a linkage ring, and a limiting assembly. The elastic element made of shape memory alloy and the axial compression spring drive the arc-shaped seal to adjust the gap when the temperature changes. The axial movement of the transmission component drives the limiting assembly to release the radial restriction, thereby realizing the adaptive adjustment of the seal.

Benefits of technology

Effectively control the sealing gap, avoid sealing failure, improve sealing performance, and ensure that the sealing effect is not affected by temperature changes.

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    Figure CN122106929A_ABST
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Abstract

The present application relates to the technical field of compressor sealing, and particularly relates to a sealing structure capable of radial adjustment and responding to temperature change, comprising a labyrinth ring, an arc-shaped sealing element, a reset assembly, a transmission element, a linkage ring and a limiting assembly, the transmission element is used for driving the limiting assembly to remove the radial limitation on the arc-shaped sealing element through the axial movement of the transmission element under the deformation force of the elastic element caused by temperature change, and at the same time, the arc-shaped sealing element is driven by the reset assembly to move radially to adjust the gap between the arc-shaped sealing element and the labyrinth ring. The sealing structure can adaptively adjust the distance between the arc-shaped sealing element and the labyrinth ring according to the temperature change, so that the gap between the labyrinth of the labyrinth ring and the matching surface of the arc-shaped sealing element can be adaptively adjusted to control the sealing gap between the compressor casing and the rotor, avoid the leakage caused by sealing failure, and improve the sealing performance.
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