# US 9,435,225 B2 · Exhaust case for a turbomachine with a flexible hub

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- Number: US 9,435,225 B2
- Document ID: US9435225B2
- Status: Granted
- Kind: B2
- Application number: 14/115,166
- Filed: 2012-05-03
- Published: 2014-04-24
- Granted: 2016-09-06
- Earliest claimed: 2011-05-04
- Assignees: Snecma
- Applicants: Sylvain Yves Jean Duval; Yannick Durand
- Inventors: Sylvain Yves Jean Duval; Yannick Durand
- Web page: https://patentgrep.com/patent/US9435225B2

## CPC

- F01D 25/24: Casings (modified for heating or cooling F01D25/14); Casing parts, e.g. diaphragms, casing fastenings (casings for rotary machines or engines in general F16M {; special arrangements in stators dealing with breaking-off of part of rotor F01D21/045})
- F01D 25/162: {Bearing supports}
- F01D 25/243: {Flange connections; Bolting arrangements (F01D25/265 takes precedence)}
- F02C 7/20: Mounting or supporting of plant; Accommodating heat expansion or creep
- F05D 2230/642: using maintaining alignment while permitting differential dilatation
- F05D 2260/94: Functionality given by mechanical stress related aspects such as low cycle fatigue [LCF] of high cycle fatigue [HCF]
- F05D 2260/941: particularly aimed at mechanical or thermal stress reduction
- F01D: NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES (machines or engines for liquids F03; non-positive displacement pumps F04D)
- F02C: GAS-TURBINE PLANTS; AIR INTAKES FOR JET-PROPULSION PLANTS; CONTROLLING FUEL SUPPLY IN AIR-BREATHING JET-PROPULSION PLANTS (construction of turbines F01D; jet-propulsion plants F02K; construction of compressors or fans F04; generating combustion products of high pressure or high velocity F23R; using gas turbines in compression refrigeration plants F25B11/00)
- F05D: INDEXING SCHEME FOR ASPECTS RELATING TO NON-POSITIVE-DISPLACEMENT MACHINES OR ENGINES, GAS-TURBINES OR JET-PROPULSION PLANTS

## Abstract

An exhaust case for a turbomachine includes, from outside towards inside, yokes, a collar and a hub, which are annular and coaxial. The hub is connected to the collar by radial arms and extends between an annular flange and an inner collar capable of guiding a gas flow. In the hub each arm includes a rib in a shape of a triangle which ends with the flange. The inner collar is extended into the hub by a plate capable of transferring forces between the flange and the yokes. The plate can be advantageously inclined with respect to a radial plane. Two portions, which enclose a cut-out formed in a minimum-stress region along the plate, are coupled with pre-set plays. The case is capable of absorbing compression and traction at a thermal gradient.

## Claims

### Claim 1

An exhaust case for a turbomachine, comprising, from an outside towards an inside:
yokes, an outer collar and a hub, which are coaxial, the hub being connected to the outer collar by radial arms and extending between an inner collar, for guiding a gas flow, and an annular flange;
wherein in the hub, the inner collar is extended by at least one annular plate for connection between the annular flange and the inner collar to transfer forces between the annular flange and the yokes; and
wherein each radial arm is extended by a radial rib comprising two opposed portions enclosing a cut-out formed in a central minimum-stress region of the rib, the portions being intercoupled with pre-set plays.

### Claim 2 (depends on 1)

An exhaust case according to claim 1, wherein the portions are joined by welding.

### Claim 3 (depends on 1)

An exhaust case according to claim 1, wherein the portions are formed by two rods including complementary heads which are capable of forming a closure, clearances between opposed heads defining the pre-set plays.

### Claim 4 (depends on 1)

An exhaust case according to claim 1, wherein the at least one annular plate extends annularly through the hub between the inner collar and the annular flange.

### Claim 5 (depends on 4)

An exhaust case according to claim 4, wherein the at least one annular plate is inclined between 0 and 45° with reference to a radial plane, or between 10 to 30°.

### Claim 6 (depends on 1)

An exhaust case according to claim 1, wherein the at least one annular plate is substantially conical.

### Claim 7 (depends on 1)

An exhaust case according to claim 1, wherein each radial rib has a generally triangular shape.

### Claim 8 (depends on 7)

An exhaust case according to claim 7, wherein each radial rib extends substantially between regions corresponding to leading edges and trailing edges of the arm at the inner collar and the annular flange.

### Claim 9 (depends on 8)

An exhaust case according to claim 8, wherein each radial rib has a leading edge in an extension of the leading edge of a corresponding arm, the leading edge of each radial rib being extended by the annular flange.