Labyrinth seal

• US 5,085,443 A
• Filed: 05/29/1990
• Issued: 02/04/1992
• Est. Priority Date: 05/29/1990
• Status: Expired due to Fees

• Current Assignee: Solvay Advanced Polymers LLC (Solvac SA)
• Original Assignee: Amoco Corporation (BP PLC)
• Inventors: Richards, Robert L.
• Primary Examiner(s): Cuchlinski, Jr., William A.
• Assistant Examiner(s): FOLKER, JAMES
• Application Number:
  US07/529,895
• Time in Patent Office: 616 Days
• Field of Search: 277/53, 277/57, 277/55, 277/97, 277/207 R, 277/214, 277/215, 277/70, 277/71, 277/72 R, 277/79, 277/200, 277/201, 277/211, 277/173, 277/208, 277/177, 415/173.5, 415/174.5, 415/174.2
• US Class Current: 277/412
• CPC Class Codes: B04B 3/02 discharging solid particles from the bowl by means coaxial with the bowl axis and moving to and fro, i.e. push-type centrifuges
• CPC Class Codes: C09K 2200/0667 Polyamides, polyimides
• CPC Class Codes: C09K 3/10 Materials in mouldable or extrudable form for sealing or packing joints or covers filling pastes C09D5/34
• CPC Class Codes: F16J 15/443 provided with discharge channels
• CPC Class Codes: F26B 5/08 by centrifugal treatment
• CPC Class Codes: Y10S 277/944 Elastomer or plastic

Abstract

This invention relates to a labyrinth seal comprising a first side in alignment with a radial axis and a second side opposite said first side, said first and said second side each including an inclined tooth, and an inner-axial surface in alignment with an axial axis and an outer-axial surface opposite said inner-axial surface having at least one hole extending to said inner-axial surface, said inner-axial surface including a plurality of teeth extending substantially inwardly toward the axial axis having grooves therebetween.

Claims

1. A floating labyrinth seal comprising:

a first side in alignment with a radial axis and a second side opposite said first side, said first and said second side each including a generally axially extending inclined tooth, and an inner-axial surface in alignment with an axial axis and an outer-axial surface opposite said inner-axial surface having at least one purge opening extending to said inner-axial surface, said inner-axial surface including at least four teeth each having an apex extending substantially inwardly toward the axial axis having grooves therebetween.

2. The seal of claim 1, wherein said plurality of substantially inwardly extending teeth on said inner-axial surface are at least slightly inclined in a direction pointing away from said purge opening.

3. The seal of claim 1, wherein said teeth are generally wedge shaped.

4. The seal of claim 1, wherein said outer-axial surface has at least one channel.

5. The seal of claim 4, further comprising an O-ring adapted to fit at least partially in at least one of said channels in said outer-axial surface.

6. The seal of claim 1, wherein said seal comprises a poly (amide-imide).

7. The seal of claim 1, wherein said seal comprises a thermoplastic, amide-imide resinous material comprising at least one recurring unit of the following moieties:

##STR4## wherein one carbonyl group is meta to and one carbonyl group is para to each amide group and wherein Z is a trivalent benzene ring or lower-alkyl-substituted trivalent benzene ring, R comprises one or more wholly- or largely-aromatic hydrocarbon radicals of from 6 to about 10 carbon atoms or two divalent aromatic hydrocarbon radicals of from 6 to about 10 atoms joined directly or by stable linkages selected from the group consisting of --O--, methylene, --CO--, --SO₂ --, and --S--.

8. The seal of claim 6 wherein R is ##STR5##

9. A floating labyrinth seal comprising:

a first side in alignment with a radial axis and a second side opposite said first side, said first and said second side each including a plurality of generally axially extending inclined teeth extending away from an axial axis, and an inner-axial surface in alignment with the axial axis and an outer-axial surface opposite said inner-axial surface having at least one purge opening extending to said inner-axial surface, said inner-axial surface including at least four inclined teeth each having an apex extending generally toward the axial axis in a direction pointing away from said purge opening and having grooves therebetween.

10. The seal of claim 9, wherein said plurality of inclined teeth on said first and said second side are disposed at an angle of less than about 50°

with respect to the axial axis.

11. The seal of claim 9, wherein said plurality of inclined teeth on said inner-axial surface are disposed at an angle ranging from about 50°

to about 85°

with respect to the axial axis.

12. The seal of claim 9, further comprising a seating means for allowing said seal to sit at least partially therein.

13. The seal of claim 12, wherein said seating means surrounds and is substantially adjacent to said outer-axial surface of the seal.

14. The seal of claim 12, wherein said outer-axial surface has a plurality of channels.

15. The seal of claim 14, further comprising an O-ring having a first side adapted to fit at least partially in at least one of said channels in said outer-axial surface and a second side adjacent said seating means.

16. The seal of claim 9, wherein said seal comprises a thermoplastic, amide-imide resinous material comprising at least one of the following moieties:

##STR6## wherein one carbonyl group is meta to and one carbonyl group is para to each amide group and wherein Z is a trivalent benzene ring or lower-alkyl-substituted trivalent benzene ring, R comprises one or more wholly- or largely-aromatic hydrocarbon radicals of from 6 to about 10 carbon atoms or two divalent aromatic hydrocarbon radicals of from 6 to about 10 atoms joined directly or by stable linkages selected from the group consisting of --O--, methylene, --CO--, --SO₂ --, and --S--.

17. The seal of claim 9, wherein said plurality of teeth are generally wedge shaped and each includes an apex.

18. The seal of claim 9, wherein at least one of said inclined teeth on each of said first and said second side and at least one of said inclined teeth on said inner-axial surface comprise a bumper means for enduring shock and vibrations.