Dynamic seal

Patent metadata

Field	Value
Publication number	US-10837559-B2
Application number	US-201716302173-A
Country	US
Kind code	B2
Filing date	May 8, 2017
Priority date	Jun 29, 2016
Publication date	Nov 17, 2020
Grant date	Nov 17, 2020

Abstract

A duct includes first and second bellows sections. First and second torsional rings are attached to, respectively, the first and second bellows sections. First and second dynamic seals are sandwiched between the first and second torsional rings.

First claim

What is claimed is:

1. A duct comprising:
first and second bellows sections;
first and second torsional rings attached to, respectively, the first and second bellows sections; and
first and second dynamic seals sandwiched between the first and second torsional rings,

the first and second dynamic seals including, respectively, first and second coils,
wherein the first and second dynamic seals includes an outer polymer jacket with base and first and second spaced apart non-symmetrical arms extending from the base.

2. The duct as recited in claim 1 , wherein the first and second torsional rings define a seal cavity there between, and the first and second dynamic seals are disposed in the seal cavity.

3. The duct as recited in claim 1 , wherein each of the first and second coils is an internal spring, and the first and second spaced apart non-symmetrical arms of each of the first and second dynamic seals partially surrounds, respectively, the first and second coils.

4. The duct as recited in claim 3 , wherein the outer polymer jacket is formed of fluoropolymer.

5. The duct as recited in claim 3 , wherein the internal spring is disposed between the first and second spaced apart non-symmetrical arms of the outer polymer jacket.

6. The duct as recited in claim 5 , wherein surfaces of the first and second spaced-apart arms have a surface roughness that is equal to or less than 32 R a .

7. The duct as recited in claim 1 , further comprising a spacer ring disposed between the first and second dynamic seals.

8. The duct as recited in claim 7 , wherein the spacer ring is a split ring.

9. The duct as recited in claim 7 , wherein the spacer ring is formed of fluoropolymer.

10. The duct as recited in claim 1 , wherein the first and second dynamic seals are continuous rings.

11. The duct as recited in claim 1 , wherein at least one of the first or second torsional rings includes a port that opens to a region between the first and second dynamic seals.

12. A seal system comprising:
first and second rings that are subject to relative twisting movement there between, the first and second rings defining an axial interface with each other, the axial interface providing at least a portion of a potential leak path between the first and second rings; and
first and second dynamic seals disposed in the axial interface between the first and second rings,
wherein the first and second dynamic seals includes an outer polymer jacket with base and first and second spaced apart non-symmetrical arms extending from the base.

13. The seal system as recited in claim 12 , wherein the first and second dynamic seals are axially spaced apart.

14. The seal system as recited in claim 13 , further comprising a spacer ring disposed axially between the first and second dynamic seals.

15. The seal system as recited in claim 12 , wherein each of the first and second dynamic seals includes a coil.

16. The seal system as recited in claim 15 , wherein the coil is disposed between the first and second spaced apart non-symmetrical arms of the outer polymer jacket.

17. The duct as recited in claim 7 , wherein the spacer ring contacts each of the first and second dynamic seals.

18. The duct as recited in claim 1 , wherein the first and second bellows sections define an axis, and first and second dynamic seals are entrapped axially between the first torsional ring and the second torsional ring.

19. The seal system as recited in claim 12 , wherein the first and second dynamic seals are disposed about an axis, the first seal ring includes a first ledge, the second ring includes a second ledge, and the first and second dynamic seals are entrapped axially between the first ledge and the second ledge.

Assignees

• Aerojet Rocketdyne Inc

Inventors

• Coleman Arthur

Classifications

• F02K9/80 Primary

  characterised by thrust or thrust vector control (burning control of solid propellants F02K9/26; feeding control of liquid or gaseous propellants F02K9/56; re-ignitable, restartable or intermittently operated rocket-engine plants F02K9/94) · CPC title

• F16L27/11

  the sleeve having the form of a bellows with multiple corrugations · CPC title

• F16J15/16

  between relatively-moving surfaces (F16J15/50, F16J15/52 take precedence; bellows pistons F16J3/06; piston-rings or ring sealings of similar construction F16J9/00) · CPC title

• F05D2300/43

  Synthetic polymers, e.g. plastics; Rubber · CPC title

• F16J15/52 Primary

  by means of sealing bellows or diaphragms (connection of valves to inflatable elastic bodies B60C29/00) · CPC title