Constant speed 2 piece ring seal arrangement

Patent metadata

Field	Value
Publication number	US-10145255-B2
Application number	US-201715405376-A
Country	US
Kind code	B2
Filing date	Jan 13, 2017
Priority date	Jan 13, 2017
Publication date	Dec 4, 2018
Grant date	Dec 4, 2018

Abstract

A carbon ring for a seal assembly in a gas turbine engine includes an outer face extending circumferentially around a center axis of the carbon ring. The carbon ring also includes an inner face extending around the center axis and disposed radially inward from the outer face. A forward face of the carbon ring extends radially between the inner face and the outer face. A rear face of the carbon ring extends radially between the inner face and the outer face and is disposed axially opposite the forward face. At least one tab extends axially from at least one of the forward face and the rear face.

First claim

The invention claimed is:

1. A carbon ring for a seal assembly in a gas turbine engine, the carbon ring comprising:
an outer face extending circumferentially around a center axis of the carbon ring;
an inner face extending around the center axis and disposed radially inward from the outer face;
a forward face that extends radially between the inner face and the outer face;
a rear face that extends radially between the inner face and the outer face and disposed axially opposite the forward face;
at least one tab extending axially from the rear face; and
at least one slot formed on the rear face, and wherein the at least one tab is circumferentially smaller than the at least one slot.

2. The carbon ring of claim 1 , wherein the at least one tab is axially smaller than the at least one slot.

3. A seal assembly comprising:
a first carbon ring comprising a tab extending axially from the first carbon ring relative a center axis of the seal assembly;
a second carbon ring disposed adjacent to the first carbon ring and coaxial with the first carbon ring, the second carbon ring comprising a slot that extends axially into the second carbon ring;
wherein the tab of the first carbon ring mates with the slot of the second carbon ring.

4. The seal assembly of claim 3 further comprising:
a front seat; and
a rear seat disposed axially aft of the front seat,
wherein the first carbon ring and the second carbon ring are both disposed axially between the front seat and the rear seat.

5. The seal assembly of claim 4 further comprising:
a spring disposed axially between the first carbon ring and the second carbon ring.

6. The seal assembly of claim 5 further comprising:
a cavity disposed between the first carbon ring and the second carbon ring, wherein the cavity is positioned radially inward from both the tab of the first carbon ring and the slot of the second carbon ring, and wherein the cavity extends axially into the first carbon ring and axially into the second carbon ring.

7. The seal assembly of claim 6 , wherein the spring is disposed inside the cavity, and wherein a first washer is disposed between the spring and the first carbon ring and a second washer is disposed between the spring and the second carbon ring.

8. The seal assembly of claim 7 , wherein the cavity extends completely around an inner circumference of the first carbon ring and the second carbon ring.

9. The seal assembly of claim 8 , wherein the first carbon ring is symmetric with the second carbon ring.

10. The seal assembly of claim 5 , wherein the first carbon ring and the second carbon ring are configured to rotate relative the front seat and the rear seat.

11. The seal assembly of claim 10 further comprising:
a liner extending circumferentially around the first carbon ring and the second carbon ring, wherein the first carbon ring and the second carbon ring are in contact with the liner and configured to rotate relative the liner.

12. The seal assembly of claim 3 , wherein the first carbon ring comprises a slot that extends axially into the first carbon ring, wherein the second carbon ring comprises a tab that extends axially from the second carbon ring, and wherein the tab of the second carbon ring mates with the slot of the first carbon ring.

13. A seal assembly for a gas turbine engine, wherein the seal assembly comprises:
an annular front seat positioned on a center axis of the seal assembly;
an annular rear seat disposed axially aft of the annular front seat;
a first carbon ring positioned axially between the annular front seat and the annular rear seat;
a second carbon ring positioned axially between the first carbon ring and the annular rear seat; and
wherein the first carbon ring rotationally interlocks with the second carbon ring.

14. The seal assembly of claim 13 , wherein the first carbon ring comprises a tab extending axially from the first carbon ring relative the center axis of the seal assembly, wherein the second carbon ring comprises a slot that extends axially into the second carbon ring, and wherein the tab of the first carbon ring mates with the slot of the second carbon ring.

15. The seal assembly of claim 14 , wherein the first carbon ring comprises a slot that extends axially into the first carbon ring, wherein the second carbon ring comprises a tab that extends axially from the second carbon ring, and wherein the tab of the second carbon ring mates with the slot of the first carbon ring.

16. The seal assembly of claim 15 , wherein the first carbon ring is symmetric with the second carbon ring.

Assignees

• United Technologies Corp

Inventors

• Miller Jonathan Logan
• Craig Colin D

Classifications

• F01D11/003 Primary

  by packing rings; Mechanical seals · CPC title

• F05D2260/52

  involving springs · 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

• F05D2250/182

  crenellated, notched · CPC title

• F16J15/441

  with floating ring · CPC title