US2006104806A1PendingUtilityA1

Low friction O-ring for use in a carbon face seal

31
Individually held — no corporate assignee on recordPriority: Nov 18, 2004Filed: Nov 18, 2004Published: May 18, 2006
Est. expiryNov 18, 2024(expired)· nominal 20-yr term from priority
Inventors:William L. GieslerJennifer ZonneveldTodd DobbinsBetty KocsisPeter Zeiner
F02C 7/277F01D 11/005F16J 15/348F05D 2240/55
31
PatentIndex Score
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Claims

Abstract

A stator seal assembly is provided that includes a seal case, an O-ring and a stator ring. The seal case has an inner peripheral wall, an outer peripheral wall, and an annular cavity formed therebetween. The O-ring is coupled to the seal case inner peripheral wall and disposed in the annular cavity, and is constructed of a material having stress versus strain ratio of less than about 5 ksi and a Shore M value of between about 30 and 50. The stator ring is disposed within the seal case annular cavity.

Claims

exact text as granted — not AI-modified
1 . A stator seal assembly comprising: 
 a seal case having an inner peripheral wall, an outer peripheral wall, and an annular cavity formed therebetween;    an O-ring coupled to the seal case inner peripheral wall and disposed in the annular cavity, the O-ring comprising a material having stress versus strain ratio of less than about 5 ksi and a Shore M value of between about 30 and 50; and    a stator ring disposed within the seal case annular cavity.    
   
   
       2 . The seal of  claim 1 , wherein the material further comprises a fluorocarbon elastomer.  
   
   
       3 . The seal of  claim 2 , wherein the material further comprises at least one of perfluorocarbon, peroxide cured fluorocarbon, GLT fluorocarbon, and GFLT fluorocarbon.  
   
   
       4 . The seal of  claim 1 , wherein the material further comprises at least one of silicone, fluorosilicone, ethylene propylene, nitrile, butadiene, chloroprene, butyl, isoprene, fluoroelastomers, polyurethane, polyester, and, in accordance with ASTM D1418 abbreviations, the elastomer compounds of ACM, AEM, CSM, EPDM, EPM, FKM, FEPM, FFKM, CO, ECO, CO, ECO, BR, CR, IIR, CIIR, IR, NBR, SBR, HNBR, XNBR, FVMQ, PMQ, PVMQ, MQ, VMQ, AU, and EU.  
   
   
       5 . The seal of  claim 1 , wherein the stress versus strain ratio of the material is between about 0.1 and 5.0 ksi.  
   
   
       6 . The seal of  claim 1 , wherein, the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.+10° F. and having a compression set of less than about 20%.  
   
   
       7 . The seal of  claim 6 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.+10° F. and having a volume swell of less than about 12%.  
   
   
       8 . The seal of  claim 7 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.±10° F. and having a reduction in ultimate elongation damage of less than about 10%.  
   
   
       9 . The seal of  claim 8 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.±10° F. and having a reduction in tensile strength of less than about 10%.  
   
   
       10 . A seal assembly comprising: 
 a seal case having an inner peripheral wall, an outer peripheral wall, and an annular cavity formed therebetween;    an O-ring coupled to the seal case inner peripheral wall and disposed in the annular cavity, the O-ring comprising a material having stress versus strain ratio of less than about 5.0 ksi and a Shore M value of about 50; and    a stator ring disposed within the seal case annular cavity.    
   
   
       11 . The seal of  claim 10 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.±10° F. and having a compression set of less than about 20%.  
   
   
       12 . The seal of  claim 11 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.+10° F. and having a volume swell of less than about 12%.  
   
   
       13 . The seal of  claim 12 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.±10° F. and having a reduction in ultimate elongation damage of less than about 10%.  
   
   
       14 . The seal of  claim 13 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.±10° F. and having a reduction in tensile strength of less than about 10%.  
   
   
       15 . A face seal assembly comprising: 
 a seal rotor adapted to mount to a shaft and having an axially facing flange;    a seal case having an inner peripheral wall, an outer peripheral wall, and an annular cavity formed therebetween;    an O-ring coupled to the seal case inner peripheral wall and disposed in the annular cavity, the O-ring comprising a material having stress versus strain ratio of less than about 5 ksi and a Shore M value of between about 30 and 50; and    a stator ring disposed within the seal case annular cavity and configured to engage the axially facing flange.    
   
   
       16 . The seal of  claim 15 , wherein the material further comprises a fluorocarbon elastomer.  
   
   
       17 . The seal of  claim 16 , wherein the material further comprises at least one of perfluorocarbon, peroxide cured fluorocarbon, GLT fluorocarbon, and GFLT fluorocarbon.  
   
   
       18 . The seal of  claim 17 , wherein the material further comprises at least one of silicone, fluorosilicone, ethylene propylene, nitrile, butadiene, chloroprene, butyl, isoprene, fluoroelastomers, polyurethane, polyester, and, in accordance with ASTM D1418 abbreviations, the elastomer compounds of ACM, AEM, CSM, EPDM, EPM, FKM, FEPM, FFKM, CO, ECO, CO, ECO, BR, CR, IIR, CIIR, IR, NBR, SBR, HNBR, XNBR, FVMQ, PMQ, PVMQ, MQ, VMQ, AU, and EU.  
   
   
       19 . The seal of  claim 17 , wherein the stress versus strain ratio is between about 0.1 and 5.0 ksi.  
   
   
       20 . The seal of  claim 15 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.+10° F. and having a compression set of less than about 20%.  
   
   
       21 . The seal of  claim 20 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.+10° F. and having a volume swell of less than about 12%.  
   
   
       22 . The seal of  claim 21 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.+10° F. and having a reduction in ultimate elongation damage of less than about 10%.  
   
   
       23 . The seal of  claim 22 , wherein the material comprises material capable of being soaked in oil for at least three hundred thirty-six (336) hours at 392° F.±10° F. and having a reduction in tensile strength of less than about 10%.  
   
   
       24 . An air turbine starter comprising 
 a rotatable shaft;    a seal assembly coupled to the rotatable shaft, the seal assembly comprising: 
 a seal rotor coupled to the rotatable shaft, the seal rotor having an axially facing flange;  
 a seal case having an inner peripheral wall, an outer peripheral wall, and an annular cavity formed therebetween;  
 an O-ring coupled to the seal case inner peripheral wall and disposed in the annular cavity, the O-ring comprising a material having stress versus strain ratio of less than about 5 ksi and a Shore M value of between about 30 and 50; and  
 a stator ring disposed within the seal case annular cavity and configured to engage the axially facing flange.  
   
   
   
       25 . The seal of  claim 24 , wherein the material further comprises a fluorocarbon elastomer.  
   
   
       26 . The seal of  claim 25 , wherein the O-ring further comprises at least one of perfluorocarbon, peroxide cured fluorocarbon, GLT fluorocarbon, and GFLT fluorocarbon.  
   
   
       27 . The seal of  claim 24 , wherein the material further comprises at least one of silicone, fluorosilicone, ethylene propylene, nitrile, butadiene, chloroprene, butyl, isoprene, fluoroelastomers, polyurethane, polyester, and, in accordance with ASTM D1418 abbreviations, the elastomer compounds of ACM, AEM, CSM, EPDM, EPM, FKM, FEPM, FFKM, CO, ECO, CO, ECO, BR, CR, IIR, CIIR, IR, NBR, SBR, HNBR, XNBR, FVMQ, PMQ, PVMQ, MQ, VMQ, AU, and EU.  
   
   
       28 . The seal of  claim 24 , wherein the stress versus strain ratio is between about 0.1 and 5.0 ksi.

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