CN113492988A

CN113492988A - Reverse thrust device and aircraft engine

Info

Publication number: CN113492988A
Application number: CN202010255198.3A
Authority: CN
Inventors: 何宝明; 杜尚飞; 陈焕
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2020-04-02
Filing date: 2020-04-02
Publication date: 2021-10-12
Anticipated expiration: 2040-04-02
Also published as: CN113492988B

Abstract

The present disclosure relates to a thrust reverser and an aircraft engine. Wherein, the thrust reverser includes: a frame member; a movable housing located outside the frame member; and a roller chute connection mechanism for movably mounting the movable housing on the frame member. Through adopting gyro wheel spout coupling mechanism to replace slide rail and slide rail bush linear contact's sliding structure, can effectively reduce the backstepping frictional resistance of removal dustcoat under the backstepping state, improve slip efficiency, reduce the jamming probability to improve the operational reliability of backstepping.

Description

Reverse thrust device and aircraft engine

Technical Field

The disclosure relates to the technical field of aero-engines, in particular to a reverse thrust device and an aero-engine.

Background

The reverse thrust device is an important component of a large-scale transport plane and a large-scale passenger plane nacelle, and has the main functions of obtaining reverse thrust by changing the exhaust flow direction of an engine, enabling the plane to efficiently and reliably decelerate, obviously shortening the landing and running distance of the plane, having a particularly prominent effect on a wet and frozen runway, reducing the requirement of the plane on the airport, improving the use efficiency of the airport, and simultaneously being also applied to the interrupted takeoff of the plane and improving the working safety of the plane.

The thrust reverser widely applied to the turbofan aircraft engine at present is a C-shaped cascade thrust reverser, as shown in fig. 1 and 2, the C-shaped cascade thrust reverser is composed of left and right half C-

shaped culverts

1a and 1b with the same function and similar structure, as shown in fig. 2, the C-shaped culvert 1a is composed of two large components, namely a frame part 2 and a movable outer cover 3, the movable outer cover 3 is slidably arranged at the periphery of the frame part 2, wherein, as shown in fig. 3 to 9, the frame part 2 comprises an upper sliding rail beam 2a, a lower sliding rail beam 2b, a torque box 2C, a core cabin cover 2d, a cascade 2e and the like, and the movable outer cover 3 comprises an upper sliding rail 3a, a lower sliding rail 3b, an outer wall plate 3C, an outer wall of the outer cover 3d, a choke door 3e, a pull rod 3f and the like.

As shown in fig. 10 and 11, the upper sliding rail 3a of the movable housing and the culvert outer wall 3d are connected together by high locking bolts, etc., the upper sliding rail 3a is provided with a slidable sliding rail 3a-1, the sliding rail 3a-1 is of a linear structure and has a longer length, about one meter, the upper sliding rail beam 2a is provided with a linear sliding rail bushing 2a-1 matched with the sliding rail 3a-1, and the matching mode of the lower sliding rail 3b and the sliding rail bushing 2b-1 on the lower sliding rail beam 2b is the same as the matching mode of the upper sliding rail 3a and the sliding rail bushing 2a-1 on the upper sliding rail beam 2 a. When the thrust reverser is unfolded, the thrust reverser actuating system drives the movable outer cover 3 to move backwards, an upper slide rail 3a and a lower slide rail 3b of the movable outer cover 3 translate backwards together in a slide rail bushing 2a-1 of an upper slide rail beam 2a and a slide rail bushing 2b-1 of a lower slide rail beam 2b, a front end support of an outer wall 3d of the culvert drives a front end support of a choke valve 3e to translate, meanwhile, the choke valve 3e deflects under the action of a pull rod 3f and finally blocks the thrust reverser airflow, and the bypass airflow is discharged to the oblique front through a blade grid 2e after being deflected by the choke valve 3e, so that the thrust reverser is generated.

The slide rail and the slide rail bushing are in a linear contact sliding mode due to the fact that the slide rail and the slide rail bushing are long in length. When the thrust reversal actuating system pushes the movable outer cover to move backwards, the sliding rail is easy to have a clamping failure when the sliding rail slides in the sliding rail bushing under the lateral force of the actuating system and the deformation condition of the movable outer cover, so that effective thrust reversal cannot be generated, the reliability of thrust reversal is reduced, and the safety of airplanes and crew members can be threatened in serious cases.

Disclosure of Invention

The inventor researches and finds that the related art has the problem that the backward thrust reliability of the mobile housing is low.

In view of this, the embodiment of the present disclosure provides a thrust reverser and an aircraft engine, which can ensure that a movable outer cover moves stably in a thrust reversal state, and improve thrust reversal reliability.

Some embodiments of the present disclosure provide a thrust reverser comprising:

a frame member;

a movable housing located outside the frame member; and

and the roller chute connecting mechanism is used for movably mounting the movable outer cover on the frame component.

In some embodiments, the frame member includes a chute beam having a chute, the mobile housing includes a roller mounting beam, the roller chute attachment mechanism includes a chute and a roller mounted on the roller mounting beam, the roller is disposed within the chute.

In some embodiments, the runner is an embedded runner and is formed in the runner beam, and the roller is embedded in the runner.

In some embodiments, the roller chute connecting mechanism comprises two chutes and two sets of rollers which are arranged in an intersecting manner in the axial direction, and the two sets of rollers are arranged in the two chutes in a one-to-one manner.

In some embodiments, the roller-chute connection comprises two sets of rollers arranged vertically in the axial direction.

In some embodiments, each set of rollers includes a plurality of rollers spaced apart along the sliding direction of the roller mounting beam.

In some embodiments, a plurality of rollers are provided at both ends of the roller mounting beam in the sliding direction.

In some embodiments, the roller includes a roller rotatable about a mandrel mounted on the roller mounting beam, a mandrel, and a spacer mounted on the mandrel between the roller and the roller mounting beam with a predetermined gap between the spacer and the end surface of the roller.

In some embodiments, the ends of the chute are provided with flared structures.

Some embodiments of the present disclosure provide an aircraft engine comprising the aforementioned thrust reverser.

Therefore, according to the embodiment of the disclosure, the roller sliding groove connecting mechanism is adopted to replace a sliding structure in which the sliding rail is in linear contact with the sliding rail bushing, so that the reverse thrust frictional resistance of the movable outer cover in a reverse thrust state can be effectively reduced, the sliding efficiency is improved, the clamping stagnation probability is reduced, and the reliability of the reverse thrust operation is improved.

Drawings

The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments of the disclosure and together with the description, serve to explain the principles of the disclosure.

The present disclosure may be more clearly understood from the following detailed description, taken with reference to the accompanying drawings, in which:

FIG. 1 is a schematic overall structure diagram of a conventional C-shaped cascade thrust reverser;

FIG. 2 is a schematic structural diagram of a C-shaped culvert in a conventional C-shaped cascade thrust reverser;

FIG. 3 is a schematic structural diagram of a frame component of a conventional C-shaped cascade thrust reverser;

FIGS. 4 and 5 are cross-sectional views at positions A-A and B-B of FIG. 3, respectively;

FIG. 6 is a schematic structural diagram of a movable housing in a conventional C-shaped cascade thrust reverser;

FIGS. 7 and 8 are cross-sectional views at positions C-C and D-D of FIG. 6, respectively;

FIG. 9 is a meridional cross-sectional view of a prior art C-grid thrust reverser;

FIG. 10 is a schematic structural diagram of the upper slide rail and the upper slide rail beam in the prior C-shaped cascade thrust reverser;

FIG. 11 is a cross-sectional view at the F-F position of FIG. 10;

FIG. 12 is a schematic view of the configuration of the mounting engagement of the runner beam and the roller mounting beam in some embodiments of the thrust reverser of the present disclosure;

FIGS. 13 and 14 are enlarged partial views of FIG. 12 at the locations of circle E and circle F, respectively;

FIG. 15 is a cross-sectional view at the position G-G in FIG. 12;

FIG. 16 is an enlarged partial schematic view of FIG. 15 at the location of circle G;

FIG. 17 is a schematic end mounted mating configuration of a sheave beam and a roller mounting beam of some embodiments of the thrust reverser of the present disclosure;

fig. 18 is a partially enlarged schematic view at the position of circle H in fig. 17.

Description of the reference numerals

1a, 1b and C-shaped culvert; 2. a frame member; 2a, an upper sliding rail beam; 2b, a lower sliding rail beam; 2c, a torque box; 2d, a core nacelle cover; 2e, blade cascade; 2a-1, 2b-1, a slide rail bushing; 3. moving the housing; 3a, an upper slide rail; 3b, a lower sliding rail; 3c, an outer wall plate; 3d, outer walls of the culvert are arranged; 3e a choke valve; 3f, a pull rod; 3a-1, a slide rail; 4. a chute beam; 5. mounting a beam on the roller; 6. a chute; 7. a roller; 7-1, a roller; 7-2, a mandrel; 7-3, a gasket; 7-4, a nut; 8. and (3) a flaring structure.

Detailed Description

Various exemplary embodiments of the present disclosure will now be described in detail with reference to the accompanying drawings. The description of the exemplary embodiments is merely illustrative and is in no way intended to limit the disclosure, its application, or uses. The present disclosure may be embodied in many different forms and is not limited to the embodiments herein. These embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art. It should be noted that: the relative arrangement of parts and steps, the composition of materials, numerical expressions and numerical values set forth in these embodiments are to be construed as merely illustrative, and not as limitative, unless specifically stated otherwise.

The use of "first," "second," and similar terms in this disclosure is not intended to indicate any order, quantity, or importance, but rather are used to distinguish one element from another. The word "comprising" or "comprises", and the like, means that the element preceding the word covers the element listed after the word, and does not exclude the possibility that other elements are also covered. "upper", "lower", "left", "right", and the like are used merely to indicate relative positional relationships, and when the absolute position of the object being described is changed, the relative positional relationships may also be changed accordingly.

In the present disclosure, when a specific device is described as being located between a first device and a second device, there may or may not be intervening devices between the specific device and the first device or the second device. When a particular device is described as being coupled to other devices, the particular device may be directly coupled to the other devices without intervening devices or may be directly coupled to the other devices with intervening devices.

All terms used in the present disclosure have the same meaning as understood by one of ordinary skill in the art to which the present disclosure belongs, unless otherwise specifically defined. It will be further understood that terms, such as those defined in commonly used dictionaries, should be interpreted as having a meaning that is consistent with their meaning in the context of the relevant art and will not be interpreted in an idealized or overly formal sense unless expressly so defined herein.

Techniques, methods, and apparatus known to those of ordinary skill in the relevant art may not be discussed in detail, but are intended to be part of the specification where appropriate.

Some embodiments of the present disclosure provide a thrust reverser comprising: the movable outer cover is arranged on the outer side of the frame component, and the roller chute connecting mechanism is used for movably mounting the movable outer cover on the frame component.

The frame component is a main body fixing structure of the thrust reverser, and comprises a torque box, a core cabin cover, a blade cascade and other structures in some embodiments, the movable outer cover comprises an outer wall plate, an outer culvert wall, a choke door, a pull rod and other structures, and when the thrust reverser is unfolded, the thrust reverser system drives the movable outer cover to move backwards. Through adopting gyro wheel spout coupling mechanism to replace slide rail and slide rail bush linear contact's sliding structure, can effectively reduce the backstepping frictional resistance of removal dustcoat under the backstepping state, improve slip efficiency, reduce the jamming probability to improve the operational reliability of backstepping. In addition, the thrust requirement and the relevant indexes such as weight of the reverse thrust actuating system can be reduced.

As shown in fig. 12 to 16, in some embodiments, the frame member includes a chute beam 4 provided with a chute 6, the mobile housing includes a culvert outer wall 3d and a roller mounting beam 5, the culvert outer wall 3d is fixedly connected with the roller mounting beam 5, the roller chute connection mechanism includes a chute 6 and a roller 7 mounted on the roller mounting beam 5, and the roller 7 is disposed in the chute 6. The chute beam 4 forms stable and reliable sliding connection with the roller mounting beam 5 through the roller chute connecting mechanism, and the movable outer cover is guaranteed to move stably under a reverse thrust state.

In some alternative embodiments, the frame member includes a roller mounting beam, the movable housing includes a chute beam having a chute, the roller chute connection includes a chute and a roller mounted on the roller mounting beam, the roller is disposed in the chute, and the movable housing is also guaranteed to move stably in a thrust-back state.

In order to ensure that the rollers reliably slide within the runners, in some embodiments the runners 6 are embedded runners and are formed in the runner beams 4, with the rollers 7 embedded in the runners 6.

In some embodiments, as shown in fig. 16, the roller 7 comprises a roller 7-1, a mandrel 7-2, a gasket 7-3 and a nut 7-4, the roller 7-1 can rotate around the mandrel 7-2, the mandrel 7-2 is fixedly mounted by the nut 7-4 after passing through a hole on the roller mounting beam 5, the gasket 7-3 is mounted on the mandrel 7-2 and located between the roller 7-1 and the roller mounting beam 5, and a preset gap is formed between the gasket 7-3 and the end face of the roller 7-1, so that the roller 7-1 cannot rub against the roller mounting beam 5 when rotating around the mandrel 7-2.

As shown in fig. 15 and 16, in some embodiments, the roller-chute connecting mechanism includes two chutes 6 and two sets of rollers 7 disposed to intersect each other in the axial direction, and the two sets of rollers 7 are disposed in the two chutes 6 one by one, so that it is ensured that the roller mounting beam 5 does not separate from the chute beam 4 when the rollers 7 move in the chutes 6. As shown in fig. 15 and 16, in some embodiments, the roller-chute connection mechanism includes two sets of rollers 7 vertically arranged in the axial direction, and as shown in fig. 16, the set of rollers 7 arranged in the X-direction ensures that the roller mounting beam 5 moves relative to the chute beam 4 while limiting the movement of the roller mounting beam 5 in the Y-direction; the other group of rollers 7 which are axially arranged in the Y direction ensure that the roller mounting beam 5 moves relative to the chute beam 4 and simultaneously limit the movement of the roller mounting beam 5 in the X direction; the two sets of rollers 7 ensure that the roller mounting beam 5 moves relative to the chute beam 4, and simultaneously limit the movement of the roller mounting beam 5 in the direction X, Y, thereby improving the smooth movement performance of the movable outer cover in a reverse thrust state.

In order to improve the contact stability of the rollers with the sliding grooves, in some embodiments, as shown in fig. 12 to 18, each set of rollers 7 includes a plurality of rollers 7 arranged at intervals along the sliding direction of the roller mounting beam 5. The arrangement of the rollers 7 can ensure that when part of the rollers 7 slide out of the sliding groove 6, the other part of the rollers are still in the sliding groove 6, so that the movable outer cover can stably slide at each position, and enough rollers support the load on the movable outer cover. The number of the rollers is determined according to factors such as a reverse thrust function, reliability, stress and the like.

In some embodiments, as shown in conjunction with fig. 12 to 18, a plurality of rollers 7 are provided at both ends in the sliding direction of the roller mounting beam 5. Only need set up a plurality of gyro wheels 7 at the ascending both ends of the slip direction of gyro wheel installation roof beam 5 just can guarantee to remove the dustcoat and can steadily slide in each position, and when partial gyro wheel took place the single-point and became invalid, other gyro wheels still can normally work. The structure design is simplified while the moving stability is ensured, and the method has high implementability.

In order to ensure that the rollers 7 can be smoothly loaded into the runners 6 in the runner beams 4, in some embodiments, the ends of the runners 6 are provided with flared structures 8, as shown in fig. 17 and 18. The flaring design is carried out to the end of the sliding groove 6, when the flaring structure 8 can ensure that the roller 7 slides in after sliding out in the sliding groove 6, the roller 7 can smoothly enter the sliding groove 6 without hurting the edge of the sliding groove 6, the service life of the roller 7 and the sliding groove 6 is prolonged, and the motion stability of the movable outer cover is improved.

Some embodiments of the present disclosure provide an aircraft engine comprising the aforementioned thrust reverser. The aero-engine adopting the reverse thrust device in the embodiment of the disclosure can reduce the probability of occurrence of the clamping stagnation fault of the movable outer cover during reverse thrust operation, prolong the service life of a reverse thrust component, improve the reliability of the reverse thrust operation and reduce the safety risk of the reverse thrust.

Thus, various embodiments of the present disclosure have been described in detail. Some details that are well known in the art have not been described in order to avoid obscuring the concepts of the present disclosure. It will be fully apparent to those skilled in the art from the foregoing description how to practice the presently disclosed embodiments.

Although some specific embodiments of the present disclosure have been described in detail by way of example, it should be understood by those skilled in the art that the foregoing examples are for purposes of illustration only and are not intended to limit the scope of the present disclosure. It will be understood by those skilled in the art that various changes may be made in the above embodiments or equivalents may be substituted for elements thereof without departing from the scope and spirit of the present disclosure. The scope of the present disclosure is defined by the appended claims.

Claims

1. A thrust reverser, comprising:

a frame member;

a movable housing located outside the frame member; and

a roller chute connection for movably mounting the mobile housing on the frame member.

2. Counterthrust device according to claim 1, characterized in that the frame part comprises a runner beam (4) provided with a runner (6), the mobile housing comprises a roller mounting beam (5), the roller runner connection comprises the runner (6) and a roller (7) mounted on the roller mounting beam (5), the roller (7) being arranged within the runner (6).

3. Counterthrust device according to claim 2, characterized in that said runner (6) is an embedded runner and is formed in said runner beam (4), said rollers (7) being embedded in said runner (6).

4. A thrust reverser according to claim 2, wherein the roller-and-runner linkage comprises two runners (6) and two sets of rollers (7) arranged axially crosswise, the two sets of rollers (7) being arranged one for one in the two runners (6).

5. Counterthrust device according to claim 4, characterized in that said roller-chute connection comprises two sets of rollers (7) arranged vertically in the axial direction.

6. Counterthrust device according to claim 4, characterized in that each set of rollers (7) comprises a plurality of rollers (7) arranged at intervals along the sliding direction of the roller mounting beam (5).

7. Counterthrust device according to claim 6, characterized in that the plurality of rollers (7) are provided at both ends in the sliding direction of the roller mounting beam (5).

8. Counterthrust device according to claim 2, characterized in that the roller (7) comprises a roller (7-1), a spindle (7-2) and a washer (7-3), the roller (7-1) being rotatable around the spindle (7-2), the spindle (7-2) being mounted on the roller mounting beam (5), the washer (7-3) being mounted on the spindle (7-2) and being located between the roller (7-1) and the roller mounting beam (5), the washer (7-3) having a predetermined clearance from the end face of the roller (7-1).

9. Counterthrust device according to claim 2, characterized in that the end of the chute (6) is provided with a flaring structure (8).

10. An aircraft engine comprising a thrust reverser according to any one of claims 1 to 9.