Progress in dry gas seal performance evolution of unidirectional spiral groove and its derivative structures

doi:10.11949/j.issn.0438-1157.20170007

Abstract

Abstract:

Spiral groove dry gas seal (S-DGS), one of the typical non-contacting surface seals, has been widely applied to shaft-end seals of moderate or high speed turbomachinery. Current status of DGS research and development was summarized on spiral grooves and grooves with different types of molded lines. Structures of derived spiral grooves were systematically analyzed for the purpose of improving film stability, sealing performance, anti-abrasion, and hydrophobic behavior under different operating conditions. Based on their functional characteristics, these derived structures were classified into four types, namely, stability-increased at high speed, leakage-reduced at high speed, stability-increased at low speed, and hydrophobic wear-resistant. Future development would still focus on further improvement of gas film stability and sealing performance at high speed and pressure, quick opening characteristics and gas film stability at low speed and pressure, as well as biomimic design of super hydrophobic and strong wear-resisting seal surfaces. These areas will be critical to expand applications, to enhance reliability, and to extend service life of DGS in the future.

Key words: unidirectional spiral groove, dry gas seal, optimization design, stability, surface

摘要：

螺旋槽干气密封（S-DGS）是一种典型的非接触式机械密封，在中高速旋转机泵的轴端密封装置中已得到广泛应用。本文对螺旋槽及不同型线单向螺旋槽DGS的研究现状进行了总结，系统归纳分析了为改善不同工况条件下DGS的气膜稳定性、密封性、耐磨性和疏水特性而演化出的各种螺旋槽衍生结构，并根据其功能特性将其归类为高速提稳型、高速减漏型、低速提稳型和疏水耐磨型4类型槽。指出进一步提高S-DGS在高速高压条件下的气膜稳定性和密封性、低速低压条件下的快速开启特性和气膜稳定性，以及超疏水、强耐磨型螺旋槽端面结构的仿生设计是未来研究的重点和热点，也是拓宽DGS应用领域、提高其工作可靠性和使用寿命的关键所在。

关键词: 螺旋槽, 干气密封, 优化设计, 稳定性, 表面

CLC Number:

TH117.2

PENG Xudong, ZONG Cong, JIANG Jinbo. Progress in dry gas seal performance evolution of unidirectional spiral groove and its derivative structures[J]. CIESC Journal, 2017, 68(4): 1271-1281.

彭旭东, 宗聪, 江锦波. 干气密封单向螺旋槽及其衍生结构功能演变进展[J]. 化工学报, 2017, 68(4): 1271-1281.

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