# US 5,346,362 A · Mechanical damper

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- Number: US 5,346,362 A
- Document ID: US5346362A
- Status: Granted
- Kind: A
- Application number: 08/052,874
- Filed: 1993-04-26
- Granted: 1994-09-13
- Earliest claimed: 1993-04-26
- Assignees: United Technologies Corporation
- Inventors: Kurt J. Bonner; Jose M. Alvarez, Jr.
- Web page: https://patentgrep.com/patent/US5346362A

## CPC

- F01D 11/127: {with a deformable or crushable structure, e.g. honeycomb}
- F01D 11/005: {Sealing means between non relatively rotating elements}
- F01D 25/04: Antivibration arrangements
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)

## Abstract

The mechanical damper is fabricated from a relatively thin metal spring stock and formed in cross-section to an E-shape that is arcuately bent into a ring that fits into the cavity defined between the inner diameter of the inner shroud and the outer diameter of the segmented back rings of the honeycomb sealing structure of the stator for the compressor of a gas turbine engine. The E-shaped damper is segmented and provides damping of the compressor stator of a gas turbine engine and is particularly adapted for stators that are formed from integrally cast stator vanes and shrouds.

## Claims

### Claim 1

In combination, a stator for rotating machinery which includes integrally cast stator vanes and shrouds, the inner shroud of said shrouds being disposed adjacent to the inner diameter of said vanes and defining an annular surface, a segmented honeycomb seal element concentrically supported to the shroud and defining with said annular surface an annular cavity, a mechanical damper being E-shaped in cross-section fabricated from flexible, resilient spring material adaptable to form an annular shape to fit within said cavity and bear against the surface of said inner shroud in frictional relationship to dissipate energy of the vibratory motion imparted to said stator.

### Claim 2 (depends on 1)

The combination as claimed in claim 1 wherein said shroud is disposed in the compressor of a gas turbine engine and said compressor includes a drum rotor having radially extending teeth that engage the honeycomb of said honecomb segments to form a seal to prevent leakage of the working fluid medium of said gas turbine engine.

### Claim 3 (depends on 2)

The combination as claimed in claim 2 including segmented back rings supporting said honeycomb segments and means to support said honeycomb segments to said stator.

### Claim 4 (depends on 3)

The combination as claimed in claim 3 wherein said means includes axially extending flanges disposed on opposite sides of the inner diameter of said inner shroud and said segmented back rings including complementary U-shaped side portions defining annular channels to accommodate each of said axially extending flanges.

### Claim 5 (depends on 4)

The combination as claimed in claim 4 wherein the E-shaped damper includes end legs, one of said end legs bearing against the inner surface of the inner diameter of said inner shroud and the other of said end legs bearing against the outer surface of said segmented back ring.

### Claim 6 (depends on 4)

The combination of claim 4 including a pair of spaced radial depending walls defining said cavity in the inner diameter of said inner shroud, said E-shaped damper includes a pair of end legs, one of said end legs bearing against at least one of said pair of radial depending walls.

### Claim 7 (depends on 6)

The combination of claim 6 wherein said segmented back ring includes a radial extending portion bearing against one of said radial depending walls, and the other of said end legs bears against said radial extending portion.

### Claim 8 (depends on 1)

The combination of claim 1 wherein said E-shaped damper is segmented.