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To ensure the reliability of dynamic seal performance of low temperature valve in liquid rocket engine, the sealing pressure and performance of a new type of labyrinth packing dynamic seal structure are simulated and tested. Firstly, the structure of traditional packing dynamic seal is optimized, and a new PTFE-Graphite-Metal labyrinth composite seal is designed. Then, based on the thermal stress coupling method, the influence of the working condition on the dynamic sealing performance is analyzed, and two empirical models for PTFE and Graphite are proposed to represent the dependence of contact stress on both the loading pressure and temperature. Finally, the sealing performance of the new labyrinth dynamic seal is tested at room and low temperature. The results show that the new labyrinth dynamic seal can achieve good sealing performance at room and low temperature, which is consistent with the simulation results.
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为了保证液体火箭发动机中低温阀门动密封性能的可靠性,通过仿真和试验研究了一种新型迷宫式填料动密封结构的密封压力及性能。首先,对传统填料动密封进行了结构优化,设计了一种新的聚四氟乙烯-石墨-金属迷宫组合密封件。其次,基于热应力耦合方法分析了不同工况对密封件密封性能的影响,并且得到了两种经验模型来表征聚四氟乙烯和石墨的接触应力与加载压力和温度的依赖关系。最后,对该密封件进行了常温和低温下的密封性能试验,结果表明,新型迷宫式动密封结构在常温和低温下都能够达到良好的密封性能,与仿真结果一致。
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刘纯(1993—),男,工程师,主要研究方向为冲击动力学和阀门设计。
高柏桦(1992—),男,工程师,主要研究方向为阀门设计。
钟梦妮(1991-),女,工程师,主要研究方向为阀门设计。
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Packing seal structure schematic diagram, figureFileSmall=Sipwm3+LKPwtg/U1C+eVhg==, figureFileBig=ZAJjKYtXaSs0GcURM2MFDw==, tableContent=null), ArticleFig(id=1197260956414816724, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图1, caption=
填料密封结构原理, figureFileSmall=Sipwm3+LKPwtg/U1C+eVhg==, figureFileBig=ZAJjKYtXaSs0GcURM2MFDw==, tableContent=null), ArticleFig(id=1197260956582588885, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 2, caption=
Relation between radial specific pressure coefficient and preload, figureFileSmall=nQOkJ7GcMMbh6htYttTLdw==, figureFileBig=jFNvkapfNkrC3ApCG0XTtA==, tableContent=null), ArticleFig(id=1197260956632920534, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图2, caption=
径向比压系数与预紧力的关系, figureFileSmall=nQOkJ7GcMMbh6htYttTLdw==, figureFileBig=jFNvkapfNkrC3ApCG0XTtA==, tableContent=null), ArticleFig(id=1197260956792304088, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 3, caption=
Labyrinth packing seal, figureFileSmall=t6O0MV2oXhHa3aq7NF0jiQ==, figureFileBig=Lsa3HaomTFxQ9nsftflVwg==, tableContent=null), ArticleFig(id=1197260956918133209, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图3, caption=
迷宫式组合填料密封件, figureFileSmall=t6O0MV2oXhHa3aq7NF0jiQ==, figureFileBig=Lsa3HaomTFxQ9nsftflVwg==, tableContent=null), ArticleFig(id=1197260957035573722, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 4, caption=
Force analysis diagram of packing seal structure, figureFileSmall=TSXtJ0TYcZ9PauYPayPZdw==, figureFileBig=NjKc2DjNRFcFVzB4gGD5kA==, tableContent=null), ArticleFig(id=1197260957111071195, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图4, caption=
填料密封结构受力分析, figureFileSmall=TSXtJ0TYcZ9PauYPayPZdw==, figureFileBig=NjKc2DjNRFcFVzB4gGD5kA==, tableContent=null), ArticleFig(id=1197260957165597148, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 5, caption=
Mesh distribution of seal model, figureFileSmall=zrSaZ92TTUanEdbGMzpYFw==, figureFileBig=Q2XI2Rj5+ZKcB2sFwZ+4ww==, tableContent=null), ArticleFig(id=1197260957278843357, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图5, caption=
密封件模型的网格分布, figureFileSmall=zrSaZ92TTUanEdbGMzpYFw==, figureFileBig=Q2XI2Rj5+ZKcB2sFwZ+4ww==, tableContent=null), ArticleFig(id=1197260958419694046, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 6, caption=
Schematic diagram of model boundary conditions, figureFileSmall=6DltVmeVZKzqvvWYeXcLyQ==, figureFileBig=2FGv4hzYkIJ0JmkaW5ANgA==, tableContent=null), ArticleFig(id=1197260958482608607, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图6, caption=
密封件模型的边界条件示意, figureFileSmall=6DltVmeVZKzqvvWYeXcLyQ==, figureFileBig=2FGv4hzYkIJ0JmkaW5ANgA==, tableContent=null), ArticleFig(id=1197260958549717472, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 7, caption=
Stress-strain curves of PTFE and graphite, figureFileSmall=l+1U+2uL9OGeC9AopXbhaw==, figureFileBig=npp2qjo7mwEgAW2VZyLi0Q==, tableContent=null), ArticleFig(id=1197260958604243425, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图7, caption=
聚四氟乙烯和石墨的应力应变曲线, figureFileSmall=l+1U+2uL9OGeC9AopXbhaw==, figureFileBig=npp2qjo7mwEgAW2VZyLi0Q==, tableContent=null), ArticleFig(id=1197260958658769378, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 8, caption=
Radial contact stress of different materials in seal, figureFileSmall=ZW0mYpAPYpXXY2NDwSbhlQ==, figureFileBig=+jyR7I5+SN4/dnZhIGfZNg==, tableContent=null), ArticleFig(id=1197260958721683939, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图8, caption=
密封件内不同材料的径向接触应力, figureFileSmall=ZW0mYpAPYpXXY2NDwSbhlQ==, figureFileBig=+jyR7I5+SN4/dnZhIGfZNg==, tableContent=null), ArticleFig(id=1197260958784598500, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 9, caption=
Relationship between radial contact stress and loading pressure of seal, figureFileSmall=Vcj02B6gc6eJDs/4V4Cjdg==, figureFileBig=Q9QMU943v9iFBDbke9ik/Q==, tableContent=null), ArticleFig(id=1197260958943982053, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图9, caption=
密封件径向接触应力与加载压力之间的关系, figureFileSmall=Vcj02B6gc6eJDs/4V4Cjdg==, figureFileBig=Q9QMU943v9iFBDbke9ik/Q==, tableContent=null), ArticleFig(id=1197260959086588390, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 10, caption=
Relationship between contact stress and temperature of seal, figureFileSmall=pfQX+9Xblh9wdyQzOTIWDg==, figureFileBig=znMJRo3GH6ODkxFFSKg8yQ==, tableContent=null), ArticleFig(id=1197260959191445991, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图10, caption=
密封件接触应力与温度的关系, figureFileSmall=pfQX+9Xblh9wdyQzOTIWDg==, figureFileBig=znMJRo3GH6ODkxFFSKg8yQ==, tableContent=null), ArticleFig(id=1197260959254360552, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 11, caption=
Fitting results of contact stress of seal, figureFileSmall=xcH2ZXFXWyTETbQXCXOYYg==, figureFileBig=50NBt5V74/CosA+MqeFquw==, tableContent=null), ArticleFig(id=1197260959317275113, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图11, caption=
密封件接触应力的拟合结果, figureFileSmall=xcH2ZXFXWyTETbQXCXOYYg==, figureFileBig=50NBt5V74/CosA+MqeFquw==, tableContent=null), ArticleFig(id=1197260959388578282, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 12, caption=
Sealing test fixture, figureFileSmall=iB4dW8yilwE5/v92+A4jVw==, figureFileBig=Ld9pCJPKpuO7Q8+u6eW/0A==, tableContent=null), ArticleFig(id=1197260959443104235, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图12, caption=
密封试验工装, figureFileSmall=iB4dW8yilwE5/v92+A4jVw==, figureFileBig=Ld9pCJPKpuO7Q8+u6eW/0A==, tableContent=null), ArticleFig(id=1197260959501824492, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Fig. 13, caption=
Comparison results of seal test, figureFileSmall=1g5An/CaL0w2cMWaAF09Sg==, figureFileBig=o/DIMkQD/2apqH0/8nLsbA==, tableContent=null), ArticleFig(id=1197260959568933357, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=图13, caption=
密封试验对比结果, figureFileSmall=1g5An/CaL0w2cMWaAF09Sg==, figureFileBig=o/DIMkQD/2apqH0/8nLsbA==, tableContent=null), ArticleFig(id=1197260959631847918, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Tab. 1, caption=
Detail list of sealing parts, figureFileSmall=null, figureFileBig=null, tableContent=
| 零件序号 | 零件名称 | 件数/单套 | 材料 |
|---|
| 1 | 薄金属圈 | 6 | 304不锈钢 |
| 2 | 厚金属圈 | 2 | 304不锈钢 |
| 3 | 聚四氟乙烯密封圈 | 2 | 7110聚四氟乙烯 |
| 4 | 石墨密封圈 | 3 | 3805石墨 |
| 5 | 碟簧 | 2 | 631不锈钢 |
), ArticleFig(id=1197260959686373871, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=表1, caption=
密封件零件明细, figureFileSmall=null, figureFileBig=null, tableContent=
| 零件序号 | 零件名称 | 件数/单套 | 材料 |
|---|
| 1 | 薄金属圈 | 6 | 304不锈钢 |
| 2 | 厚金属圈 | 2 | 304不锈钢 |
| 3 | 聚四氟乙烯密封圈 | 2 | 7110聚四氟乙烯 |
| 4 | 石墨密封圈 | 3 | 3805石墨 |
| 5 | 碟簧 | 2 | 631不锈钢 |
), ArticleFig(id=1197260959749288432, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Tab. 2, caption=
Physical properties of shell, rod and metal gaskets, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 密度$/\left({\mathrm{{kg}}\cdot {\mathrm{m}}^{-3}}\right)$ | 杨氏模量/GPa | 导热系数$/\left({\mathrm{W}\cdot {\left(\mathrm{m}\cdot \mathrm{K}\right)}^{-1}}\right)$ | 线膨胀系数${\mathrm{K}}^{-1}$ | 泊松比 |
|---|
| 金属垫片/壳体 | 7930 | 193 | 16.3 | ${1.7}\times {10}^{-5}$ | 0.3 |
| 杆4169 | 8 240 | 199 | 14.7 | ${1.18}\times {10}^{-5}$ | 0.3 |
), ArticleFig(id=1197260959833174513, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=表2, caption=
壳体、杆和金属垫片的物理性能, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 密度$/\left({\mathrm{{kg}}\cdot {\mathrm{m}}^{-3}}\right)$ | 杨氏模量/GPa | 导热系数$/\left({\mathrm{W}\cdot {\left(\mathrm{m}\cdot \mathrm{K}\right)}^{-1}}\right)$ | 线膨胀系数${\mathrm{K}}^{-1}$ | 泊松比 |
|---|
| 金属垫片/壳体 | 7930 | 193 | 16.3 | ${1.7}\times {10}^{-5}$ | 0.3 |
| 杆4169 | 8 240 | 199 | 14.7 | ${1.18}\times {10}^{-5}$ | 0.3 |
), ArticleFig(id=1197260959891894770, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Tab. 3, caption=
Physical properties of graphite and PTFE, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 密度$/\left({\mathrm{{kg}}\cdot {\mathrm{m}}^{-3}}\right)$ | 杨氏模量/GPa | 导热系数$/\left({\mathrm{W}\cdot {\left(\mathrm{m}\cdot \mathrm{K}\right)}^{-1}}\right)$ | 线膨胀系数${\mathrm{K}}^{-1}$ | 泊松比 |
|---|
| 石墨 | 1000 | 1 | 100 | ${4.0}\times {10}^{-6}$ | 0.4 |
| PTFE | 1500 | 1.3 | 14.7 | ${1.2}\times {10}^{-4}$ | 0.46 |
), ArticleFig(id=1197260959950615027, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=表3, caption=
石墨和聚四氟乙烯的物理性能, figureFileSmall=null, figureFileBig=null, tableContent=
| 材料 | 密度$/\left({\mathrm{{kg}}\cdot {\mathrm{m}}^{-3}}\right)$ | 杨氏模量/GPa | 导热系数$/\left({\mathrm{W}\cdot {\left(\mathrm{m}\cdot \mathrm{K}\right)}^{-1}}\right)$ | 线膨胀系数${\mathrm{K}}^{-1}$ | 泊松比 |
|---|
| 石墨 | 1000 | 1 | 100 | ${4.0}\times {10}^{-6}$ | 0.4 |
| PTFE | 1500 | 1.3 | 14.7 | ${1.2}\times {10}^{-4}$ | 0.46 |
), ArticleFig(id=1197260960021918196, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Tab. 4, caption=
Physical properties of graphite and PTFE, figureFileSmall=null, figureFileBig=null, tableContent=
| 聚四氟乙烯 | 石墨 |
|---|
| ${a}_{1}$ | ${b}_{1}$ | ${c}_{1}$ | ${a}_{2}$ | ${c}_{2}$ |
| 0.92 | 0.048 | -19 | 0.88 | -2.5 |
), ArticleFig(id=1197260960080638453, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=表4, caption=
公式拟合参数, figureFileSmall=null, figureFileBig=null, tableContent=
| 聚四氟乙烯 | 石墨 |
|---|
| ${a}_{1}$ | ${b}_{1}$ | ${c}_{1}$ | ${a}_{2}$ | ${c}_{2}$ |
| 0.92 | 0.048 | -19 | 0.88 | -2.5 |
), ArticleFig(id=1197260960143553014, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Tab. 5, caption=
Sealing test data(25kN), figureFileSmall=null, figureFileBig=null, tableContent=
| 温度 | 介质压力/MPa | 漏率$/\left({\mathrm{{mL}}\cdot {\mathrm{s}}^{-1}}\right)$ |
|---|
| 常温(296K) | 50 | 0.084 |
| 77K | 50 | 1.8 |
), ArticleFig(id=1197260960231633399, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=表5, caption=
密封试验数据(25kN), figureFileSmall=null, figureFileBig=null, tableContent=
| 温度 | 介质压力/MPa | 漏率$/\left({\mathrm{{mL}}\cdot {\mathrm{s}}^{-1}}\right)$ |
|---|
| 常温(296K) | 50 | 0.084 |
| 77K | 50 | 1.8 |
), ArticleFig(id=1197260960298742264, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=EN, label=Tab. 6, caption=
Sealing test data(38kN), figureFileSmall=null, figureFileBig=null, tableContent=
| 温度 | 介质压力/MPa | 漏率$/\left({\mathrm{{mL}}\cdot {\mathrm{s}}^{-1}}\right)$ |
|---|
| 常温(296K) | 50 | 0.021 6 |
| 77K | 50 | 1.4 |
), ArticleFig(id=1197260960386822649, tenantId=1146029695717560320, journalId=1146119989267898375, articleId=1154065253479469312, language=CN, label=表6, caption=
密封试验数据(38kN), figureFileSmall=null, figureFileBig=null, tableContent=
| 温度 | 介质压力/MPa | 漏率$/\left({\mathrm{{mL}}\cdot {\mathrm{s}}^{-1}}\right)$ |
|---|
| 常温(296K) | 50 | 0.021 6 |
| 77K | 50 | 1.4 |
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