CN108928459B - Grid type thrust reverser - Google Patents
Grid type thrust reverser Download PDFInfo
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- CN108928459B CN108928459B CN201810841666.8A CN201810841666A CN108928459B CN 108928459 B CN108928459 B CN 108928459B CN 201810841666 A CN201810841666 A CN 201810841666A CN 108928459 B CN108928459 B CN 108928459B
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- thrust
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- outer cover
- grid
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B64—AIRCRAFT; AVIATION; COSMONAUTICS
- B64C—AEROPLANES; HELICOPTERS
- B64C15/00—Attitude, flight direction, or altitude control by jet reaction
- B64C15/02—Attitude, flight direction, or altitude control by jet reaction the jets being propulsion jets
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- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
- Aviation & Aerospace Engineering (AREA)
- Structures Of Non-Positive Displacement Pumps (AREA)
- Cylinder Crankcases Of Internal Combustion Engines (AREA)
Abstract
The invention provides a grid type thrust reverser, comprising: the reverse-thrust outer cover is cylindrical and is provided with an axial opening extending the whole length of the reverse-thrust outer cover at the upper part, the grid and the reverse-thrust sliding cover are arranged on the reverse-thrust outer cover, and the reverse-thrust sliding cover can move between a folding state covering the grid and an opening state exposing the grid under the action of a reverse-thrust actuating device; the reverse-thrust inner cover is cylindrical, is arranged in the reverse-thrust outer cover and is radially spaced from the inner surface of the reverse-thrust outer cover, an axial opening extending the whole length of the reverse-thrust inner cover is formed in the upper part of the reverse-thrust inner cover, and the axial opening of the reverse-thrust inner cover is circumferentially aligned with the axial opening of the reverse-thrust outer cover; and the plurality of chokes are hinged on the inner surface of the reverse-thrust outer cover in a circumferential direction and are jointed on the inner surface of the reverse-thrust outer cover in a hinged mode, in the retracted state, the plurality of chokes are attached to the inner surface of the reverse-thrust outer cover, and in the opened state, the plurality of chokes block an annular passage between the reverse-thrust outer cover and the reverse-thrust inner cover. When the choke valve is in the retracting state, the grille type counterthrust device with the structure of the invention can not block the exhaust of the engine, thus improving the thrust and the fuel efficiency of the engine.
Description
Technical Field
The invention relates to an aircraft thrust reverser, in particular to a grille thrust reverser suitable for a turbojet engine.
Background
The thrust reverser is an important speed reducer of civil aircraft, is arranged on a turbojet engine nacelle, and drives related components to deflect through the movement of the thrust reverser, so that the exhaust direction of the engine is turned back to decelerate the aircraft.
The thrust reverser generally comprises two parts, namely a thrust outer cover and a thrust inner cover, an annular passage for engine exhaust is formed between the thrust outer cover and the thrust inner cover, and the thrust outer cover and the thrust inner cover are generally designed into a streamline shape so as to reduce the airflow resistance of the engine exhaust. The reverse-thrust outer cover is generally provided with a reverse-thrust sliding cover, a choke valve, a grating and a reverse-thrust actuating device, the reverse-thrust actuating device pushes the reverse-thrust sliding cover to move, the reverse-thrust sliding cover drives the choke valve to deflect and block an annular passage of engine exhaust, the reverse-thrust sliding cover moves while keeping the grating free from being blocked, and the engine exhaust is guided by the grating to be discharged towards the oblique front to generate reverse thrust.
In order to facilitate installation and maintenance, a thrust reverser inner cover and a thrust reverser outer cover in a traditional thrust reverser are divided into a left half cover and a right half cover (or the first half cover and the second half cover), two ends of the left half outer cover and the left half inner cover are fixedly connected together through a partition plate to form the left half cover, two ends of the right half outer cover and the right half inner cover are fixedly connected together through the partition plate to form the right half cover, the upper parts of the left half cover and the right half cover are respectively installed on an engine hanger through hinges, and the lower parts of the left half cover and the right half cover are connected together through lock catches. The conventional thrust reverser has a drawback in that since a partition is connected between the thrust inner shroud and the thrust outer shroud, the partition obstructs exhaust of the engine, thereby reducing thrust and fuel efficiency of the engine.
Therefore, there is a need in the art for a thrust reverser that can further improve the thrust and fuel efficiency of an engine.
Disclosure of Invention
In order to overcome the defects, the invention provides a novel grid type thrust reverser. Specifically, this grid thrust reverser includes:
the reverse thrust outer cover is cylindrical and is provided with an axial opening at the upper part, the axial opening extends to the full length of the reverse thrust outer cover, a grating and a reverse thrust sliding cover are arranged on the reverse thrust outer cover, and the reverse thrust sliding cover can move between a folding state of covering the grating and an opening state of exposing the grating under the action of a reverse thrust actuating device;
the reverse thrust inner cover is cylindrical, is arranged in the reverse thrust outer cover and is radially spaced from the inner surface of the reverse thrust outer cover, an axial opening is formed in the upper part of the reverse thrust inner cover, and the axial opening of the reverse thrust inner cover extends the full length of the reverse thrust inner cover and is circumferentially aligned with the axial opening of the reverse thrust outer cover;
a plurality of chokes hingedly connected circumferentially adjacent one another to an inner surface of the thrust housing, the plurality of chokes abutting the inner surface of the thrust housing in the stowed state, and the plurality of chokes blocking an annular passage between the thrust housing and the thrust inner housing in the open state.
In a preferred embodiment, the thrust reverser outer shroud and the thrust reverser inner shroud are cylindrical, truncated cone-shaped, or streamlined, and
each of the plurality of chokes is in the shape of a scalloped ring.
In a preferred embodiment, the front ends of the thrust reverser outer cover and the thrust reverser inner cover are provided with connecting devices which are used for being connected with a fan casing of the engine.
In a preferred embodiment, the connecting means is a snap ring provided with protrusions and recesses arranged alternately in the circumferential direction.
In a preferred embodiment, the connecting means is a flange.
In a preferred embodiment, the reverse-acting means are hydraulically driven reverse-acting means.
In a preferred embodiment, the reverse-acting means is an electrically driven reverse-acting means.
In a preferred embodiment, sliding rails are arranged on two sides of the axial opening of the outer thrust reverser cover and the inner thrust reverser cover, and the outer thrust reverser cover and the inner thrust reverser cover are connected with an engine in a hanging manner through the sliding rails.
In a preferred embodiment, the thrust reverser comprises four thrust reversers arranged circumferentially at the front end of the thrust reverser housing.
In addition, the invention also provides an aircraft engine with the grille type thrust reverser.
Additional features and advantages of the grid thrust reverser described herein will be set forth in the detailed description which follows, and will be apparent to those skilled in the art from that description or recognized by practicing the embodiments described herein, including the detailed description which follows, the claims, as well as the appended drawings.
It is to be understood that both the foregoing general description and the following detailed description present various embodiments, and are intended to provide an overview or framework for understanding the nature and character of the claimed subject matter. The accompanying drawings are included to provide a further understanding of the various embodiments and are incorporated in and constitute a part of this specification. The drawings illustrate various embodiments described herein and together with the description serve to explain the principles and operations of the claimed subject matter.
Drawings
With reference to the above objects, the technical features of the present invention are clearly described in the following claims, and its advantages are apparent from the following detailed description with reference to the accompanying drawings, which illustrate by way of example a preferred embodiment of the present invention, without limiting the scope of the inventive concept.
Fig. 1 shows a schematic view of a thrust reverser cowl in a grid thrust reverser according to the invention.
Fig. 2 shows a schematic view of the inner counterthrust cover in a grid-type counterthrust device according to the invention.
Fig. 3 shows an end view of a grid thrust reverser installation according to the invention.
Fig. 4 shows a schematic view of a snap ring pushing back on the front end of the housing.
Fig. 5 shows a longitudinal section of a grid thrust reverser according to the invention in the stowed state.
Fig. 6 shows a longitudinal section of a grid thrust reverser according to the invention in the open state.
List of reference numerals
100 reverse thrust outer cover
101 axial opening
102 grid
103 reverse thrust sliding cover
200 reverse thrust inner cover
201 axial opening
300 choke
110. 210 slide rail
400 engine hanger
104 connecting device
204 front end connecting device
1041 projection
1042 recess
105 reverse-pushing actuating device
Detailed Description
Reference will now be made in detail to the various embodiments of the present invention, examples of which are illustrated in the accompanying drawings and described below. While the invention will be described in conjunction with the exemplary embodiments, it will be understood that this description is not intended to limit the invention to those exemplary embodiments. On the contrary, the invention is intended to cover not only these exemplary embodiments, but also various alternatives, modifications, equivalents and other embodiments, which may be included within the spirit and scope of the invention as defined by the appended claims. For convenience in explanation and accurate definition in the appended claims, the terms "upper", "lower", "inner", "outer", "left" and "right" are used to describe features of the exemplary embodiments with reference to the positions of such features as displayed in the figures. Exemplary embodiments of the present invention will be described in detail below with reference to the accompanying drawings.
The invention provides a grid type thrust reverser, which comprises a thrust outer cover 100, a thrust inner cover 200 and a choke 300 arranged in an annular passage between the thrust outer cover 100 and the thrust inner cover 200. Referring to fig. 1 and 2, there are shown schematic views of a thrust reverser outer shroud 100 and a thrust reverser inner shroud 200, respectively, of a grid thrust reverser according to the present invention.
As shown in fig. 1, thrust reverser cowl 100 has a substantially cylindrical shape and has an axial opening 101 extending along the entire length of thrust reverser cowl 100 at the top. The thrust reverser cowling 100 is provided with a grill 102 and a thrust reverser slide cowl 103. The thrust slide shroud 103 is longitudinally movable under the action of thrust actuation means between a stowed condition covering the grille 102 and an open condition uncovering the grille 102.
As shown in fig. 2, thrust reverser inner cowl 200 is substantially cylindrical and has, above, an axial opening 201 extending along the entire length of the thrust reverser outer cowl, which axial opening 201 is circumferentially aligned with axial opening 101 of thrust reverser outer cowl 100. Inner thrust reverser cowl 200 is disposed inside of outer thrust reverser cowl 100 and spaced apart from the inner surface of outer thrust reverser cowl 100, independently of each other, without a coupling structure. An annular passage is formed between thrust reverser cowl 100 and thrust reverser cowl 200 for the flow of air from the engine to pass therethrough and generate thrust.
A plurality of chokes 300 are provided in the annular passage between the inner thrust reverser cowl 100 and the inner thrust reverser cowl 200. The plurality of chokes 300 are disposed to be circumferentially grounded to each other and are hingedly coupled to an inner surface of the thrust-back housing 100. During normal flight of the aircraft, the chokes 300 are in a stowed state, and the plurality of chokes 300 are attached to the inner surface of the thrust reverser cowl 100, so that the annular passage is not blocked, and smooth passage of engine exhaust gas is ensured, thereby generating thrust. When deceleration is required, the choke valve 300 is in an open state, and the plurality of choke valves 300 blocks an annular passage between the thrust reverser outer shroud 100 and the thrust reverser inner shroud 200. At this time, the engine exhaust is guided through the grill 102 and discharged obliquely forward, and a reverse thrust is generated, thereby decelerating the engine.
Compared with the prior art, when the choke valve 300 is in the retracted state, the grid type counterthrust device with the structure of the invention has the advantages that the exhaust of the engine is not blocked, and the thrust and the fuel efficiency of the engine are improved.
Although fig. 1 and 2 show that the thrust-back outer shroud 100 and the thrust-back inner shroud 200 are each cylindrical, in practice, they may be truncated or streamlined in shape having one end thicker than the other end. And each of the plurality of chokes 300 has a fan-shaped ring shape. Further, it is also conceivable that the thrust-back housing 100 and the thrust-back housing 200 have a similar regular polygon cross section, and the chokes 300 are provided in the same number as the number of sides of the regular polygon, and each of the chokes 300 has a trapezoidal shape.
Further, preferably, slide rails 110 and 210 are provided on both sides of the axial openings 101, 201 of the thrust reverser outer cover 100 and the thrust reverser inner cover 200, by which the thrust reverser outer cover 100 and the thrust reverser inner cover 200 are connected to the engine hanger 400, as shown in the end view of fig. 3.
In addition, it is also preferable to provide a coupling device 104 at the front end of the thrust reverser cowling 100, the coupling device 104 being used to couple the thrust reverser cowling 100 to the engine fan case, so as to achieve an axial fixing of the grid thrust reverser.
In the embodiment shown in fig. 4, the connecting means 104 is a snap ring provided with protrusions 1041 and depressions 1042 alternately arranged in the circumferential direction. The snap ring can be quickly and conveniently connected with or disconnected from the fan case of the engine through rotation so as to axially fix or unlock the thrust reverser cowling.
Also preferably, as in the embodiment shown in fig. 3, the thrust reverser inner cowl 200 also has a front end connection 204, the front end connection 204 being a flange. The flange may be provided with, for example, threaded holes for secure attachment to the engine fan case. Of course, the front end connection means 204 may also be provided as a snap ring.
In addition, referring to fig. 1, a reverse-thrust actuating device 105 is further disposed at the front end of the reverse-thrust housing 100, and the reverse-thrust actuating device 105 may be an electrically-driven reverse-thrust actuating device or a hydraulically-driven reverse-thrust actuating device. As shown in fig. 5 and 6, the thrust reverser 105 is coupled to the thrust reverser slide shroud 103 to move the thrust reverser slide shroud 103 between the stowed and deployed states. Furthermore, the reverse-acting device 105 is also associated with the choke 300, for example as shown in the figures, the outer end of the choke 300 being hingedly connected to the reverse housing 100 and being fixed to, for example, the grille 102 of the reverse housing 100 by means of a hinged link at a position remote from the outer end. When the reverse actuator 105 moves the reverse slide cover 103 to the retracted state, the choke valve 300 is attached to the inner surface of the reverse outer cover 100, and the engine exhaust gas is discharged through the annular passage between the reverse outer cover 100 and the reverse inner cover 200, generating a forward thrust. When the reverse actuator 105 moves the reverse sliding cover 103 to the open position to expose the grill 102, the reverse sliding cover 103 pivots the choke valve 300 downward to a position blocking the annular passage, thereby forcing the engine exhaust to flow out of the grill 102 obliquely forward, generating a reverse thrust.
Preferably, four reverse-thrust actuation means are arranged in the circumferential direction at the front end of the reverse-thrust housing 100, thereby ensuring that the reverse-thrust sliding housing 103 and the choke valve 300 are uniformly forced in the circumferential direction.
While the foregoing has described the invention in terms of its structure and operation in conjunction with the preferred embodiments, it is to be understood that such exemplifications are merely illustrative and not restrictive of the invention. Therefore, modifications and variations of the present invention may be made within the true spirit and scope of the claims, and these modifications and variations are intended to fall within the scope of the claims of the present invention.
Claims (9)
1. A grid thrust reverser comprising:
the reverse thrust outer cover is cylindrical and is provided with an axial opening at the upper part, the axial opening extends to the full length of the reverse thrust outer cover, a grating and a reverse thrust sliding cover are arranged on the reverse thrust outer cover, and the reverse thrust sliding cover can move between a folding state of covering the grating and an opening state of exposing the grating under the action of a reverse thrust actuating device;
the reverse thrust inner cover is cylindrical, is arranged in the reverse thrust outer cover and is radially spaced from the inner surface of the reverse thrust outer cover, an axial opening is formed in the upper part of the reverse thrust inner cover, and the axial opening of the reverse thrust inner cover extends the full length of the reverse thrust inner cover and is circumferentially aligned with the axial opening of the reverse thrust outer cover;
a plurality of chokes hingedly connected circumferentially adjacent one another to an inner surface of the thrust housing, the plurality of chokes abutting the inner surface of the thrust housing in the stowed state, the plurality of chokes blocking an annular passage between the thrust housing and the thrust inner housing in the open state,
the two sides of the axial opening of the reverse-thrust outer cover and the reverse-thrust inner cover are provided with sliding rails, and the reverse-thrust outer cover and the reverse-thrust inner cover are connected with an engine in a hanging mode through the sliding rails.
2. Grid thrust reverser according to claim 1,
the thrust outer cover and the thrust inner cover are cylindrical, truncated cone-shaped or streamline-shaped and
each of the plurality of chokes is in the shape of a scalloped ring.
3. Grid thrust reverser according to claim 1,
the front ends of the reverse thrust outer cover and the reverse thrust inner cover are provided with connecting devices, and the connecting devices are used for being connected with a fan casing of the engine.
4. Grid thrust reverser according to claim 3,
the connecting device is a clamping ring, and the clamping ring is provided with protrusions and depressions which are alternately arranged along the circumferential direction.
5. Grid thrust reverser according to claim 3,
the connecting means is a flange.
6. Grid thrust reverser according to claim 1,
the reverse-thrust actuating device is a hydraulic-driven reverse-thrust actuating device.
7. Grid thrust reverser according to claim 1,
the reverse-thrust actuating device is an electrically driven reverse-thrust actuating device.
8. Grid thrust reverser according to claim 1,
the reverse-thrust actuating devices are four reverse-thrust actuating devices which are circumferentially arranged at the front end of the reverse-thrust outer cover.
9. An aircraft engine having a grid thrust reverser according to any one of claims 1 to 8.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841666.8A CN108928459B (en) | 2018-07-27 | 2018-07-27 | Grid type thrust reverser |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810841666.8A CN108928459B (en) | 2018-07-27 | 2018-07-27 | Grid type thrust reverser |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108928459A CN108928459A (en) | 2018-12-04 |
| CN108928459B true CN108928459B (en) | 2022-02-01 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810841666.8A Active CN108928459B (en) | 2018-07-27 | 2018-07-27 | Grid type thrust reverser |
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| CN (1) | CN108928459B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102037233A (en) * | 2008-06-06 | 2011-04-27 | 埃尔塞乐公司 | Method for synchronizing the actuators of a movable thrust reverser cowl |
| CN102102588A (en) * | 2009-12-21 | 2011-06-22 | 通用电气公司 | Integrated nacelle assembly |
| CN103154441A (en) * | 2010-10-11 | 2013-06-12 | 埃尔塞乐公司 | Device for connecting a thrust reverser front frame to a fan casing and nacelle incorporating such a device |
| CN103224029A (en) * | 2012-01-27 | 2013-07-31 | 罗尔股份有限公司 | Nacelle |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2987600B1 (en) * | 2012-03-02 | 2014-02-28 | Aircelle Sa | APLATIE NACELLE OF TURBOREACTOR |
-
2018
- 2018-07-27 CN CN201810841666.8A patent/CN108928459B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102037233A (en) * | 2008-06-06 | 2011-04-27 | 埃尔塞乐公司 | Method for synchronizing the actuators of a movable thrust reverser cowl |
| CN102102588A (en) * | 2009-12-21 | 2011-06-22 | 通用电气公司 | Integrated nacelle assembly |
| CN103154441A (en) * | 2010-10-11 | 2013-06-12 | 埃尔塞乐公司 | Device for connecting a thrust reverser front frame to a fan casing and nacelle incorporating such a device |
| CN103224029A (en) * | 2012-01-27 | 2013-07-31 | 罗尔股份有限公司 | Nacelle |
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| Publication number | Publication date |
|---|---|
| CN108928459A (en) | 2018-12-04 |
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