CN115158676A

CN115158676A - Maintenance opening cover for nacelle

Info

Publication number: CN115158676A
Application number: CN202110372544.0A
Authority: CN
Inventors: 白杰; 李雪; 高鹏
Original assignee: AECC Commercial Aircraft Engine Co Ltd
Current assignee: AECC Commercial Aircraft Engine Co Ltd
Priority date: 2021-04-07
Filing date: 2021-04-07
Publication date: 2022-10-11

Abstract

The invention relates to a maintenance opening cover for a nacelle. The maintenance opening cover for the nacelle comprises a track and is arranged on a fan wall plate of the nacelle; the cover plate of the opening cover is in sliding fit with the track; the stopper, the flap apron passes through the stopper setting on the fan wallboard, and the stopper is under the open mode, and the flap apron can slide relative to the fan wallboard, and the stopper is under the lock-out condition, and the flap apron is fixed with the fan wallboard cooperation. The maintenance opening cover for the nacelle provided by the invention has the advantages that the overall structure occupies small space, and the maintenance in the nacelle is convenient.

Description

Maintenance opening cover for nacelle

Technical Field

The invention relates to the technical field of machining of an aircraft engine nacelle, in particular to a maintenance opening cover for the nacelle.

Background

Commercial aircraft turbofan engines are typically equipped with a nacelle. To facilitate maintenance of the components within the engine, a maintenance door is typically provided on the nacelle cover. Fig. 1 shows a prior art nacelle structure. Fig. 2 shows a prior art fan shroud configuration. As shown, a sliding oil door maintenance cover 102 is provided on the fan wall 101 for maintaining the sliding oil tank. Meanwhile, the maintenance port cover 102 also has a pressure relief function, and is used for dealing with the situation that the pressure in the cabin is increased sharply due to the rupture of the pipeline in the nacelle.

The conventional nacelle maintenance flap 102 is configured with a gooseneck hinge 103, and the nacelle maintenance flap 102 is opened by the gooseneck hinge 103, which requires a large moving space, so that the utilization rate of the space in the nacelle is reduced. With this structure, the fan case needs to be equipped with a large number of accessories, and the nacelle maintenance cover 102 is extremely likely to interfere with the accessories. Meanwhile, the nacelle maintenance cover 102 is further provided with a pressure relief door 104 and a pressure relief lock 105, and the pressure relief door 104 is fixed on the nacelle maintenance cover 102 through the pressure relief lock 105. Once the pressure relief lock 105 is opened by the pressure in the cabin, the pressure relief door 104 cannot be closed during the flight process, and a potential risk exists, which affects the flight safety.

Disclosure of Invention

Aiming at the problems in the prior art, the invention provides a maintenance opening cover for a short cabin, which has a small occupied space of the whole structure and is convenient for maintenance in the short cabin.

Specifically, the invention provides a maintenance flap for a nacelle, comprising:

the track is arranged on a fan wall plate of the nacelle;

the cover plate of the cover is in sliding fit with the track;

the limiting stopper is arranged on the fan wall plate, the limiting stopper is in an opening state, the opening cover plate can slide relative to the fan wall plate, and the limiting stopper is in a locking state, and the opening cover plate is matched and fixed with the fan wall plate.

According to one embodiment of the invention, the stopper comprises a stopper base, a mounting base, a stopper pin and a driver, wherein the stopper base is arranged on the flap cover plate, the mounting base is arranged on the fan wall plate, and the stopper pin is arranged on the mounting base through the driver;

the driver drives the limiting pin to be separated from the limiting base, and the limiting device enters an open state, so that the cover plate of the opening cover can slide relative to the fan wall plate; the driver drives the limiting pin to be inserted into the limiting base, the limiting device enters a locking state, and the cover plate of the opening cover and the fan wall plate are fixed relatively.

According to one embodiment of the invention, the limit pin comprises a fixed pin body and a movable pin body which are nested, the fixed pin body is arranged on the driver, the driver can control the movable pin body to move relative to the fixed pin body, and a first spring is arranged between the movable pin body and the fixed pin body.

According to one embodiment of the invention, the actuator comprises an electromagnetic element and a tensioner by means of which the electromagnetic element controls the movement of the mobile pin.

According to one embodiment of the invention, the maintenance flap further comprises a control button arranged on the fan wall plate, the control button is electrically connected with the electromagnetic element, and the control button is used for triggering the electromagnetic element to work.

According to one embodiment of the invention, the maintenance opening cover further comprises a slide rail, the slide rail comprises a slide block, a connecting plate and a first cylindrical expansion piece, the slide block and the first cylindrical expansion piece are arranged on two sides of the connecting plate, the slide block is in sliding fit with the rail, the connecting plate is connected with the opening cover plate through the first cylindrical expansion piece, and the opening cover plate can move relative to the rail through the slide rail.

According to one embodiment of the invention, the first columnar expansion piece comprises a fixed pin, a second spring, a guide cylinder and a limiting block, the fixed pin is arranged on the bottom surface of one side of the connecting plate and extends downwards vertically, the limiting block is arranged at the bottom of the fixed pin, the guide cylinder is arranged on the opening cover plate, the fixed pin extends downwards into the guide cylinder, the second spring is arranged in the guide cylinder and is sleeved on the fixed pin, and the bottom of the second spring abuts against the limiting block.

According to one embodiment of the present invention, the maintenance flap further includes a pressure relief door and a second cylindrical retractor, the pressure relief door being fixed to the flap cover through the second cylindrical retractor.

According to one embodiment of the present invention, the second cylindrical retractor includes a positioning pin fixed to the flap cover through a periphery of the relief door and a third spring disposed between the positioning pin and the relief door to sealingly engage the relief door with the flap cover.

According to one embodiment of the present invention, when the pressure in the short cabin is higher than the pressure threshold value, the pressure relief door overcomes the elastic deformation force of the third spring and moves in the length direction of the positioning pin to disengage the flap cover plate; when the pressure in the short cabin is lower than a pressure threshold value, the elastic deformation force of the third spring pushes the pressure relief door to be attached to the cover plate.

The maintenance opening cover for the nacelle provided by the invention adopts a rail structure, so that the maintenance opening cover can slide relative to the nacelle, the overall structure occupies a small space, the maintenance in the nacelle is convenient, and the safety performance of the engine nacelle is further improved.

It is to be understood that both the foregoing general description and the following detailed description of the present invention are exemplary and explanatory and are intended to provide further explanation of the invention as claimed.

Drawings

The accompanying drawings, which are included to provide a further understanding of the invention and are incorporated in and constitute a part of this application, illustrate embodiment(s) of the invention and together with the description serve to explain the principle of the invention. In the drawings:

fig. 1 shows a prior art nacelle structure.

Fig. 2 shows a prior art fan cover structure.

Fig. 3 shows a schematic structural view of a maintenance flap according to an embodiment of the present invention.

Fig. 4 shows a schematic cross-section B-B of a maintenance flap according to an embodiment of the invention in a closed state.

Fig. 5 is a partially enlarged schematic view of the stopper of fig. 4 in a locked state.

Fig. 6 is a partially enlarged view of the stopper of fig. 4 in an open state.

Fig. 7 shows a simplified view of a section B-B of the maintenance flap according to one embodiment of the invention in the closed state.

Fig. 8 shows a simplified view of section B-B of an embodiment of the invention in the unlocked state of the maintenance flap.

Fig. 9 shows a simplified view of section B-B during the opening of the maintenance flap according to an embodiment of the invention.

Fig. 10 shows a simplified view of section B-B during the closing of the maintenance flap according to an embodiment of the invention.

FIG. 11 isbase:Sub>A schematic view ofbase:Sub>A section A-A ofbase:Sub>A maintenance flap inbase:Sub>A closed state according to an embodiment of the present invention.

Fig. 12 is a partially enlarged schematic view of the first column expander in fig. 11 in a locked state.

Fig. 13 is a partially enlarged schematic view of the first column expander in fig. 11 in an open state.

Fig. 14 is an enlarged schematic view of the second column jack of fig. 4.

Wherein the figures include the following reference numerals:

fan wall panel 101 service flap 102

Gooseneck hinge 103 pressure relief door 104

Pressure relief lock 105

Maintenance flap structure 300 track 301

Flap cover 302 retainer 303

Limiting base 304 mounting base 305

Securing pin 306 moving pin 307

Electromagnetic element 308 tensioner 309

Control button 310 slide rail 311

Connecting plate 313 of sliding block 312

First cylindrical expansion piece 314 fixing pin 315

The second spring 316 leads to the cylinder 317

The first spring 319 of the stopper 318

Positioning pin 321 of second cylindrical expansion piece 320

Third spring 322

Detailed Description

It should be noted that the embodiments and features of the embodiments in the present application may be combined with each other without conflict.

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. It should be apparent that the described embodiments are only some of the embodiments of the present application, and not all of the embodiments. The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the application, its application, or uses. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

It is noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of example embodiments according to the present application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, and it should be understood that when the terms "comprises" and/or "comprising" are used in this specification, they specify the presence of stated features, steps, operations, devices, components, and/or combinations thereof, unless the context clearly indicates otherwise.

The relative arrangement of the components and steps, the numerical expressions, and numerical values set forth in these embodiments do not limit the scope of the present application unless specifically stated otherwise. Meanwhile, it should be understood that the sizes of the respective portions shown in the drawings are not drawn in an actual proportional relationship for the convenience of description. 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. In all examples shown and discussed herein, any particular value should be construed as merely illustrative, and not limiting. Thus, other examples of the exemplary embodiments may have different values. It should be noted that: like reference numbers and letters refer to like items in the following figures, and thus, once an item is defined in one figure, further discussion thereof is not required in subsequent figures.

In the description of the present application, it is to be understood that the orientation or positional relationship indicated by the directional terms such as "front, rear, upper, lower, left, right", "lateral, vertical, horizontal" and "top, bottom", etc., are generally based on the orientation or positional relationship shown in the drawings, and are used for convenience of description and simplicity of description only, and in the case of not making a reverse description, these directional terms do not indicate and imply that the device or element being referred to must have a particular orientation or be constructed and operated in a particular orientation, and therefore, should not be considered as limiting the scope of the present application; the terms "inner and outer" refer to the inner and outer relative to the profile of the respective component itself.

For ease of description, spatially relative terms such as "over … …", "over … …", "over … …", "over", etc. may be used herein to describe the spatial positional relationship of one device or feature to another device or feature as shown in the figures. It will be understood that the spatially relative terms are intended to encompass different orientations of the device in use or operation in addition to the orientation depicted in the figures. For example, if a device in the figures is turned over, devices described as "above" or "on" other devices or configurations would then be oriented "below" or "under" the other devices or configurations. Thus, the exemplary term "above … …" may include both orientations of "above … …" and "below … …". The device may also be oriented 90 degrees or at other orientations and the spatially relative descriptors used herein interpreted accordingly.

It should be noted that the terms "first", "second", and the like are used to define the components, and are only used for convenience of distinguishing the corresponding components, and the terms have no special meanings unless otherwise stated, and therefore, the scope of protection of the present application is not to be construed as being limited. Further, although the terms used in the present application are selected from publicly known and used terms, some of the terms mentioned in the specification of the present application may be selected by the applicant at his or her discretion, the detailed meanings of which are described in relevant parts of the description herein. Further, it is required that the present application is understood not only by the actual terms used but also by the meaning of each term lying within.

Fig. 3 shows a schematic view of the construction of the maintenance flap according to an embodiment of the present invention. As shown in the drawings, the present invention provides a maintenance flap structure 300 for a nacelle, which mainly includes a rail 301, a flap cover 302, and a stopper 303.

Wherein the track 301 is arranged on the fan wall 101 of the nacelle. In this embodiment, two rails 301 are disposed on the fan wall 101 and are disposed in parallel on two sides of the flap cover 302.

Flap cover 302 can be slidably engaged with track 301. A flap cover 302 is provided on the fan wall panel 101 by a stopper 303. When the stopper 303 is in the open state, the flap cover 302 enters the unlocked state, and the flap cover 302 can slide relative to the fan wall 101 in a direction parallel to the length direction of the rail 301. When the stopper 303 is in the locked state, the flap cover 302 enters the locked state, and the flap cover 302 is fitted and fixed to the fan wall 101. In this embodiment, the flap cover 302 may be made of any one of aluminum alloy, steel, titanium alloy, or high temperature alloy.

The maintenance opening cover structure 300 changes the turning opening mode of a hinge in the prior art, and opens the opening cover plate 302 in a sliding mode, so that the whole structure occupies small space, the maintenance and the maintenance work in a short cabin are convenient to carry out, and the safety performance of the engine nacelle is improved.

Fig. 4 shows a schematic view of a section B-B of the maintenance flap structure in a closed state according to an embodiment of the present invention. Fig. 5 is a partially enlarged schematic view of the stopper of fig. 4 in a locked state. Fig. 6 is a partially enlarged schematic view of the stopper of fig. 4 in an open state. Fig. 7 shows a simplified view of a section B-B of the maintenance flap structure in a closed state according to an embodiment of the present invention. Fig. 8 shows a simplified view of a section B-B of the maintenance flap structure in an unlocked state according to an embodiment of the present invention. Fig. 9 shows a simplified view of section B-B during the opening of the maintenance flap structure according to an embodiment of the invention. Fig. 10 shows a simplified view of section B-B during closure of the maintenance flap structure according to one embodiment of the present invention. As shown, the restraint 303 includes a restraint base 304, a mounting base 305, a restraint pin, and a driver. Limiting base 304 is arranged on flap cover plate 302, mounting base 305 is arranged on fan wall plate 101, and the limiting pin is arranged on mounting base 305 through a driver. The driver drives the stopper pin out of the stopper base 304 and the stopper 303 enters the open state so that the flap cover 302 can slide relative to the fan wall 101. The driver drives the stopper pin to insert into the stopper base 304, the stopper 303 enters a locking state, and the flap cover 302 is fixed relative to the fan wall 101. Specifically, the stopper 303 can be switched between an open and a locked state, and correspondingly, the flap cover 302 can be switched between an unlocked and a locked state. Referring to fig. 2, four sets of stoppers 303 are provided on the periphery of the flap cover 302 in the present embodiment.

Preferably, referring to fig. 5, the spacing pin comprises a nested fixed pin body 306 and a moving pin body 307. The securing pin 306 is disposed on the driver. The driver can control the moving pin 307 to move relative to the fixed pin 306, and a first spring 319 is arranged between the moving pin 307 and the fixed pin 306. More preferably, the actuator comprises an electromagnetic element 308 and a tensioner 309, the electromagnetic element 308 and the tensioner 309 being used to control the movement of the moving pin.

Turning to fig. 1, the maintenance flap structure 300 for the nacelle further includes a control button 310 disposed on the fan wall panel 101. The control button 310 is electrically connected to the electromagnetic element 308 in the stopper 303. The control button 310 may be used to trigger the operation of the electromagnetic element 308 when the aircraft is in a ground state.

Referring to fig. 5 and 7, in the initial state, the movable pin 307 extends into the limiting base 304, the limiting stopper 303 is in the locked state, the limiting base 304 cannot move in the direction perpendicular to the paper surface, so that the flap cover 302 is fixed to the fan wall plate 101, and the flap cover 302 cannot move. At this time, the control button 310 is pressed, and the control button 310 triggers the electromagnetic element 308 to operate. The electromagnetic element 308 controls the moving pin 307 to move relative to the fixed pin 306 through the tensioner 309, and the first spring 319 compresses. Referring to fig. 6 and 8, the moving pin 307 is disengaged from the stopper base 304, and the stopper 303 is in an open state. Referring to fig. 9, the flap cover 302 is naturally separated from the fan wall plate 101 downward in the direction indicated by the tip, the flap cover 302 is brought into an unlocked state, and the flap cover 302 can slide relative to the fan wall plate 101, i.e., move in the direction perpendicular to the plane of the paper, so that maintenance work can be performed on the nacelle. After the maintenance operation is completed, the flap cover 302 is pushed back to the original position, referring to fig. 10, the flap cover 302 is pushed to move toward the fan wall 101 and move upward in the direction of the tip, the movable pin 307 is inserted into the limit base 304 under the action of the first spring 319 and the tensioner 309, so that the flap cover 302 and the fan wall 101 are re-fitted and fixed, and the limiter 303 is restored to the locked state.

FIG. 11 isbase:Sub>A schematic view ofbase:Sub>A cross section A-A ofbase:Sub>A maintenance flap structure according to an embodiment of the present invention inbase:Sub>A closed state. Fig. 12 is a partially enlarged schematic view of the first column expander in fig. 11 in a locked state. Fig. 13 is a partially enlarged schematic view of the first column expander in fig. 11 in an open state. As shown in fig. 1, the maintenance flap structure 300 preferably further includes a slide rail 311. The slide rail 311 includes a slider 312, a connection plate 313, and a first column expansion piece 314. The slider 312 and the first column type retractor 314 are provided on both sides of the connection plate 313, and the slider 312 is slidably fitted to the rail 301. The connection plate 313 is connected to the flap cover 302 by a first column-shaped retractor 314, and the flap cover 302 can move relative to the rail 301 by a slide rail 311. It is easy to understand that, in the present embodiment, two sets of slide rails 311 are provided, and respectively correspond to the two tracks 301 on the two sides.

Preferably, referring to fig. 12 and 13, the first cylinder expander 314 includes a fixing pin 315, a second spring 316, a guide cylinder 317, and a stopper 318. The fixing pin 315 is disposed on a bottom surface of one side of the connection plate 313 and extends vertically downward. A stopper 318 is provided at the bottom of the fixing pin 315. The guide cylinder 317 is provided on the flap cover plate 302. The fixing pin 315 extends downward into the guiding cylinder 317, the second spring 316 is disposed in the guiding cylinder 317 and sleeved on the fixing pin 315, and the bottom of the second spring 316 abuts against the limiting block 318.

When the flap cover 302 is in the closed state, the flap cover 302 is fitted and fixed to the fan wall panel 101. Refer to fig. 12. The fixing pin 315 is inserted into the guide cylinder 317, the bottom of the fixing pin 315 abuts against the stopper 318, and the second spring 316 is in a relaxed state. When the flap cover 302 enters the unlocked state, referring to fig. 13, the flap cover 302 moves downward, and is separated from the fan wall plate 101, and the second spring 316 bears pressure. It is apparent that the distance L1 from the coupling plate 313 to the flap cover 302 in fig. 12 is smaller than the distance L1' from the coupling plate 313 to the flap cover 302 in fig. 13.

Preferably, and with reference to FIG. 3, the maintenance flap structure 300 further includes a relief door 104 and a second cylindrical retractor 320. The relief door 104 is secured to the flap cover 302 by a second cylindrical retractor 320. In this embodiment, the pressure relief door 104 may be made of a metal material or a composite material.

Fig. 14 is an enlarged schematic view of the second column jack of fig. 4. As shown, 4 sets of second cylindrical expanders 320 are provided around the periphery of the relief door 104. Each set of second cylindrical expanders 320 includes a positioning pin 321 and a third spring 322. The positioning pin 321 is fixed to the flap cover 302 through the periphery of the decompression door 104. A third spring 322 is disposed between the bottom of the head of the detent pin 321 and the vent door 104 to sealingly engage the vent door 104 with the flap cover plate 302.

Preferably, when the pressure in the cabin is higher than the pressure threshold, the pressure-relief door 104 overcomes the elastic deformation force of the third spring 322 and moves along the length direction of the positioning pin 321 to disengage the flap cover 302, and the pressure-relief door 104 is opened. When the pressure in the short cabin is lower than the pressure threshold value, the elastic deformation force of the third spring 322 pushes the pressure relief door 104 to be attached to the flap cover plate 302, and the pressure relief door 104 is closed.

The maintenance covering cap structure for the nacelle adopts a rail structure, the problem that the traditional gooseneck hinge structure occupies a large space is solved, and the risk of interference between the covering cap plate and accessories in the nacelle is reduced to the greatest extent. Simultaneously, have the function of pressure release concurrently, adopted recoverable second columnar expansion bend for the pressure release door can get back to the primary importance after under-deck pressure recovery, has eliminated the unable closed problem of traditional configuration, has reduced the influence to flight safety.

It will be apparent to those skilled in the art that various modifications and variations can be made to the above-described exemplary embodiments of the present invention without departing from the spirit and scope of the invention. Thus, it is intended that the present invention cover the modifications and variations of this invention provided they come within the scope of the appended claims and their equivalents.

Claims

1. A maintenance flap structure for a nacelle, comprising:

the track is arranged on a fan wall plate of the nacelle;

the cover plate of the cover is in sliding fit with the track;

the limiting stopper is arranged on the fan wall plate through the limiting stopper, the limiting stopper is in an opening state, the cover plate can slide relative to the fan wall plate, and the limiting stopper is in a locking state, and the cover plate is matched and fixed with the fan wall plate.

2. The maintenance flap structure according to claim 1, wherein said stopper includes a stopper base, a mounting base, a stopper pin, and a driver, said stopper base being provided on said flap cover plate, said mounting base being provided on said fan wall plate, said stopper pin being provided on said mounting base through said driver;

the driver drives the limiting pin to be separated from the limiting base, and the limiting device enters an opening state, so that the cover plate of the opening cover can slide relative to the fan wall plate; the driver drives the limiting pin to be inserted into the limiting base, the limiting device enters a locking state, and the cover plate of the opening cover and the fan wall plate are fixed relatively.

3. The maintenance flap structure according to claim 2, wherein said restraint pin comprises a fixed pin body and a movable pin body nested together, said fixed pin body being disposed on said actuator, said actuator being capable of controlling said movable pin body to move in a direction relative to said fixed pin body, and a first spring being disposed between said movable pin body and said fixed pin body.

4. The maintenance flap structure of claim 3 wherein said actuator includes a solenoid and a tensioner, said solenoid controlling the movement of said moving pin through said tensioner.

5. The maintenance flap structure according to claim 4, further comprising a control button disposed on said fan wall panel, said control button being electrically connected to said electromagnetic element, said control button being adapted to trigger operation of said electromagnetic element.

6. The maintenance flap structure according to claim 1, further comprising a slide rail, wherein the slide rail comprises a slider, a connecting plate, and a first cylindrical retractor, the slider and the first cylindrical retractor are disposed on two sides of the connecting plate, the slider is slidably engaged with the rail, the connecting plate is connected to the flap cover through the first cylindrical retractor, and the flap cover is movable relative to the rail through the slide rail.

7. The maintenance flap structure according to claim 6, wherein the first cylindrical retractor includes a fixing pin, a second spring, a guide cylinder and a stopper, the fixing pin is disposed on a bottom surface of one side of the connecting plate and extends vertically downward, the stopper is disposed on a bottom of the fixing pin, the guide cylinder is disposed on the flap cover plate, the fixing pin extends downward into the guide cylinder, the second spring is disposed in the guide cylinder and sleeved on the fixing pin, and a bottom of the second spring abuts against the stopper.

8. The maintenance flap structure according to claim 1, further comprising a relief door and a second cylindrical retractor, said relief door being secured to said flap cover by said second cylindrical retractor.

9. The maintenance flap structure according to claim 8, wherein said second cylindrical retractor includes a positioning pin secured to said flap cover through a periphery of said pressure relief door and a third spring disposed between said positioning pin and said pressure relief door for sealingly engaging said pressure relief door with said flap cover.

10. The maintenance flap structure according to claim 9, wherein when the pressure in the short compartment is higher than a pressure threshold, the pressure-relief door overcomes the elastic deformation force of the third spring and moves in the length direction of the positioning pin to disengage the flap cover; when the pressure in the short cabin is lower than a pressure threshold value, the elastic deformation force of the third spring pushes the pressure relief door to be attached to the cover plate.