JPS5936102B2 - exhaust nozzle - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a variable nozzle used in a boosted turbofan engine, and more particularly to an exhaust nozzle equipped with a device for directly supplying cooling fluid to the nozzle.

A number of cooled nozzles are known in the art, all designed to provide cooperative movement between the flap and the seal and a cooling liner that operates while the nozzle changes its position between small and large areas. It has not become.

Three patents showing variable area nozzles with cooling fluid are US Pat. No. 2,801,516, US Pat. No. 2,989,845, and US Pat.

One object of the present invention is to provide a nozzle cooling liner.
It is an object of the present invention to provide a basic structure for a nozzle cooling liner such that cooling air flows through the nozzle and seal arrangement while the nozzle is allowed to move between small area and large area positions.

Another object of the present invention is to provide a float seal that allows cooling air to flow between the flap and the seal while providing longitudinal and circumferential positioning of the float seal.

Another object of the present invention is to improve the relationship between the engine exhaust pressure acting on the seal and the liner pressure acting on the seal, so that the inner member of the seal contacts the inner surface of the inner flap member. Alternatively, it is an object to provide a structure in which the carrot design can be changed so that the outer surface of the inner flap member is placed in contact with the outer surface of the inner flap member.

Hereinafter, the present invention will be explained in detail by way of an embodiment with reference to the accompanying drawings.

In FIG. 1, an illustrated engine 2 (1) includes a conventional compressor section 4, burner section 6, turbine section 8, exhaust duct and nozzle section 10.

As shown in FIG. 2, the inner case 14 is secured to the outer housing structure 12 through a conical connecting member 16.

This connecting member is attached to the bolt 18 (outside/) housing and extends forward to the position where it is connected to the inner casing by the bolt 20,
It forms one cone compartment.

An inner liner 22 is provided along and spaced from the inner side of the inner case 14.

Spaced apart fingers 26 extend rearwardly from the end of the inner liner 22 and are configured to be flexible for purposes described below.

A plurality of main flaps 30 are pivotally mounted to the rear end of the outer housing structure 12.

The flaps are each pivotally mounted on a bracket member 32 extending inwardly from the end of the outer housing structure 12.

An actuation arm 34 extends outwardly from each flap such that movement of the arm moves the main flap 30 about its pivot point.

Each flap 30 is pivotally mounted about a preferred equilibrium point.

In some nozzle designs, this location is approximately 1/3 of the way from the leading edge.

So that all the main flaps 30 are moved as one,
The free end of each arm 34 is connected to a unison ring 36 by a connecting link 38.

A plurality of actuators 40 are mounted between the housing structure 12 and the inner case 14 in front of the connecting member 16.

An actuation rod 39 extends from the rear end of the actuator 40;
It is attached to the Unison ring 36.

Unison ring 36 is aligned with and slides within track members 37 spaced along outer housing structure 12.

Each actuating rod 39 (one extends through a hole 41 in the connecting member 16).

A nozzle sterilization device 42 connects one end of the actuator to a source of actuation pressure, while the other end connects to a drain, thereby movably positioning the main flap 30.

Such a type of structure is shown in US Pat. No. 2,815,64.3.

A plurality of balance flaps 50 extend forward from the main flap 30.

The rear end of each flap 50 (1 is the front end of the main flap 30 (
It is pivotally connected, while its front end has a cylindrical device 51 mounted for axial movement within a track device 53.

Each track device 53 is formed between the rearward extension of the inner case 14 and the rearwardly extending flange 15 on the connecting member 16 .

Although a simple cylinder and track arrangement is shown, any type of arrangement that allows axial movement in response to changes in the angular position of the balance flap 50 may be used.

A plurality of divergent flaps 60 extend rearwardly from the main flap 30.

Each flap 60 is pivotally connected at its rear end to the rear end of the main flap 30, while the rear end (1) is pivotally connected to the rear end of the outer flap 70.

Each outer flap γ0 is pivotally mounted at its front end to the rear end of the housing structure 12 at a position immediately behind the bracket member 32.

Each of these pivot connections is made to have 1 play.

These annular flap assemblies, namely balance flaps 50
, main flap 30, wider flap 60, outer flap 7
0 each have a sealing device located along the side edges of the cooperating flaps to prevent excessive leakage occurring therebetween.

Such a type of nozzle sealing device is disclosed in U.S. Pat. No. 3,730.
No. 436 and No. 3794.244.

Although the balance flap 50, the diverging flap 60, and the outer flap 70 may have simple sealing flaps placed between them for sealing, the main flap 30 cooperates with the flaps along the flaps. It has a sealing device f 7 which provides a cooling liner and provides continuity of the liner periphery as the nozzle changes position.

As shown in FIG. 2, each main flap 30 includes an inner flap member 44 connected to the inside of an outer flap member 48 along its length by a rib member 46. As shown in FIG.

The rib member 46 may be continuous, but may also consist of a plurality of smaller members aligned and provided with holes around or through it.

The inner flap member 44 (1 extends over the length of the outer flap member 48 and the 1J direction.

The rear end of each inner flap member 44 is curved outwardly at 52 to direct the flow of cooling fluid from between the inner flap member 44 and the outer flap member 48 to the diverging flap 60.
It seems to be emitted along the inner surface of the body.

The forward end of flap 30 receives cooling fluid between inner flap member 44 and outer flap member 48 from between inner liner 22, inner case 14, and balance flap 50 (see arrows indicating airflow).

This stream (1) may be derived from any desired source.

Spaced apart fingers 23 abut the inner surface of inner flap member 44 at a point inward from the connection of actuation arm 34 .

Each seal assembly includes an inner seal member 54 to seal between the flaps 30 and maintain the cooling liner at this point.

The inner seal member is connected along its length by a rib member 56 at the center of the outer seal member 58, and the outer seal member 58 extends over its entire length and width. .

Rib member 56 may have holes formed therein to permit flow therethrough, or may consist of one or more small members.

The outer seal member 58 has an edge that extends into the space between the outer flap member 48 and the inner flap member 44 of each adjacent flap 30.

Each inner seal member 54 (1 adjacent inner flap member 4
4 on the inner surface of the adjacent portion.

Such a configuration is applicable to the inner flap member 44 of each main flap 30.
extends between the inner seal member 54 and outer seal member 58 of the adjacent seal device 77.

Each sealing device 77 is adjacent to the main flap 30t on each side.
Two guide stop devices 80 are provided between the sealing device 77 and the adjacent main flap 30 to maintain this in a defined longitudinal and circumferential position.

Each guide stop device 80 includes a guide or rib 82 on seal device 77 that extends laterally from each side of rib member 56 to the adjacent edge on each side of outer seal member 58 .

A stop 84 is fixed to the outer edge of each guide or rib 82 and extends on both sides of the guide or rib 82 for purposes described below.

Each guide and stop device 80 includes two sets of projections 90 extending outwardly from a point on the flap 30 proximate the side edge of each inner flap member 44 .

Each set of protrusions is a guide or rib 82 of the sealing device flap 7.
located on each side of the

As can be seen in FIG. 4, these protrusions prevent longitudinal movement of the sealing device 77 relative to the adjacent main flap 30;
It also limits circumferential movement and ensures a seal through the use of stops 84.

A gap is prevented from being formed between the outer flap member 48 and the outer seal member 58 (1).

To facilitate assembly, a stop member 84 (one guide or cylinder) is bolted to the end of the tab 82 and is removable.

FIG. 5 shows a modified construction of the main flap 30A and sealing device 77A configured to provide an annular passageway for a substantially continuous flow of cooling air.

This structure (1. Each sealing device 77Ajj includes an inner seal member 54A- and an outer seal member 58A, both of which are connected between the inner flap member 44 and the outer flap member 48A of the adjacent main flap 30A. (This is getting longer.

In order to maintain each sealing device 7γA in a predetermined position longitudinally and circumferentially relative to the adjacent main flap 30A, in this modification (J two guide stop devices 80A is set between.

Each guide stop device 80A includes a cross member 94 connected to the outer surface of outer seal member 58A by a short projection 96.

This cross member 94 (1 each adjacent outer flap member 4
It extends circumferentially on the outer side of the outer surface of 8A and is spaced outwardly therefrom.

A cross member 94 (1) is formed in an inverted T-shape as shown in FIG. 6, and a portion 98 forms a guide or rib.

Cross member 94 (1) is formed in an inverted T-shape, but may also be formed simply as a flat rib having a thickness of 98.

A stop member 100 is provided at the outer edge of each guide or rib 98.
is installed.

This stop member extends on either side of the guide or rib for the same purpose as stop member 84 in the previous embodiment O.

Two sets of protrusions 102 are provided on each adjacent outer flap member 48A.
lateral edges (extending outward from two adjacent locations)

Is each set of protrusions a sealing device? ? The guides on A or each side of the rib 98 are arranged.

Figure 3 (The structure shown here is similar to that of the main flap 30 as shown in Figure 7.
It may be assumed that the structure has B).

In this case, each half of the inner flap member 44B is attached at one edge to the center of the inner surface of the outer flap member 48B (comprised of a separate member pivotably attached to the inner flap member 44Bo), and each half is independent of the other. To be able to pivot.

This is done in the manner of a piano hinge.

Flap device 77B may be constructed in the same manner as in FIG.

In the embodiment shown in FIG. (It's good to have this made.)

[Brief explanation of the drawing]

FIG. 1 is an illustration showing the location of the nozzle in a turbojet engine. FIG. FIG. 3 is an enlarged cross-sectional view taken along line 3-3 of FIG. 2 showing the flap and seal. FIG. 4 is a view taken along line 4-4 of FIG. 3. FIG. Figure 6 is an enlarged view showing another configuration of the cooling liner in the fully open position of the nozzle. It is a diagram showing another structure of the nozzle flap. 2... Engine, 4... Compressor section,
6... Burner section, 8... Turbine section, 10... Exhaust duct and nozzle section, 12
...Outer housing, 14...Inner case, 16...Reading member, 18, 20...
...Bolt, 22...Inner liner, 23...
...Finger, 30 ...Main flap, 3
2...Bracket member, 34...Operating arm, 36...Union ring, 37...
... Track member, 38... Connection link, 39.
... Actuation rod, 40 ... Actuator, 41 ... Opening, 42 ... Nozzle control device, 44 ... Inner flap member, 46 ...・
... Rib member, 48 ... Outer flap member, 50 ... Balance flap, 51 ...
・Cylindrical device, 52...Curved part, 53...
・Trajectory device, 54...Inner seal member, 56・
... Rib member, 58 ... Outer seal member, 60 ... Wide end flap, 70 ... Outer flap, 77 ... Seal device, 80 ...
... Guide stop device, 82 ... Guide or rib, 84 ... Stop, 90 ...
...Protrusion, 94...Cross member, 96...
...Protrusion, 100... Stop member, 102.
·····protrusion.

Claims (1)

Claims: 1. A series of circumferentially arranged flaps 30° 30A, 3 pivotally mounted to a fixed structure of a jet engine.
0B, and a sealing device 77 disposed between each two adjacent flaps of the series of flaps to seal therebetween.
77A and 77B, each of said flaps having an inner flap member 44.44A. 44B and outer flap members 48, 4 spaced from this and connected at an intermediate portion between this and both axial edges thereof;
8A and 48B, each of the sealing devices includes an inner seal member 54, 54A, and an outer seal member 58 spaced apart from the inner seal member 54, 54A and connected at an intermediate portion between the inner seal member 54 and both axial edges thereof. 58A, each of the inner seal members is arranged to circumferentially overlap the adjacent inner flap member ζ, and each of the outer seal members is arranged to overlap the adjacent outer flap member in the circumferential direction. thereby forming a cooling fluid passage having a generally substantially annular cross-section extending axially through the interior of the series of flaps and the series of sealing devices, the passageway for cooling fluid extending axially through the interior of the series of flaps and the series of sealing devices; A guide stop device 80 is provided between the flaps and the seal device which are adjacent to each other for positioning in the circumferential direction. drive means 3 for pivoting said series of flaps;
2.34. An exhaust nozzle characterized in that 36-40 are provided.