Cabin door structure deformation compensation structure

Abstract

The invention belongs to the technical field of airplane cabin door structure deformation compensation structure design, and particularly relates to a cabin door structure deformation compensation structure which comprises a door frame located on a tail belly, two side cabin doors hinged to the two side door frames respectively and a middle cabin door hinged to the rear door frame. A hinged shaft of the middle cabin door is vertical to the course; wherein the edges of the side cabin doors are provided with a plurality of lock rings, and the two edges of the middle cabin door are provided with a plurality of lock hooks for hooking the lock rings; when the cabin doors are opened, the two side cabin doors rotate downwards along the hinge shaft, the middle cabin door rotates upwards along the hinge shaft, and the lock hook hooks the lock ring; when the cabin doors are closed, the two side cabin doors rotate upwards along the hinge shaft, the middle cabin door rotates downwards along the hinge shaft, and the lock hook is separated from the lock ring.

Description

Technical Field

[0001] The present application belongs to the technical field of aircraft cabin door structure deformation compensation structure design, and in particular relates to a cabin door structure deformation compensation structure. Background Art

[0002] Aircraft doors, especially those that open in the air, are mainly used for cargo delivery to ensure the continuity of the fuselage opening. The current main backgrounds are as follows:

[0003] 1. When the door is opened in the air, it is easily affected by the airflow, causing the door structure deformation compensation structure to deform greatly, resulting in failure of the door opening and closing functions;

[0004] 2. The compensation of super-large doors is often done through their own rigidity, which is difficult and the weight is difficult to reduce;

[0005] 3. Some hatches often do not have compensation functions and are compensated by reserving gaps, which results in gaps that are too large and presents certain design disadvantages. Summary of the invention

[0006] In order to solve the above problems, the present application provides a door structure deformation compensation structure, including:

[0007] The door frame located at the rear belly, the two side doors hinged on the door frames on both sides, and the middle door hinged on the rear door frame. The hinge axis of the side door is parallel to the heading, and the hinge axis of the middle door is perpendicular to the heading;

[0008] The side hatch edges have multiple locking rings, and the two edges of the middle hatch have multiple locking hooks that hook the locking rings;

[0009] When opening the hatch, the two side hatches rotate downward along the hinge axis, the middle hatch rotates upward along the hinge axis, and the lock hook hooks the lock ring;

[0010] When closing the hatch, the two side hatches rotate upward along the hinge axis, the middle hatch rotates downward along the hinge axis, and the locking hook disengages from the locking ring.

[0011] Preferably, a guide groove is provided at the front door frame, the guide groove has a Y-shaped groove surface, the front end of the middle door has a guide roller overlapped on the fuselage, the axis of the guide roller is parallel to the heading, and when the door is closed, the guide roller enters the groove bottom along the Y-shaped groove surface.

[0012] Preferably, the heading length of the guide roller is greater than the heading width of the guide groove, so that there is a gap between the middle door and the end surface of the guide groove.

[0013] Preferably, the guide groove is provided with a margin hole at a position corresponding to the end of the guide roller, so as to compensate for the movement caused by the heading deformation of the middle door.

[0014] Preferably, when the door is closed, the side door has an over-retraction angle, which is the angle formed by the side door and the middle door, and the side door is higher than the middle door.

[0015] Preferably, the height difference between the side doors and the middle door is determined by the total width of the doors.

[0016] Preferably, the height difference between the side door and the middle door does not exceed 5 mm.

[0017] Preferably, the span width of the guide groove is determined by the span deformation of the front end of the door under extreme conditions.

[0018] Preferably, the span width of the guide groove is equal to the span deformation of the front end of the door in an extreme case plus a set margin.

[0019] Preferably, a front end surface of the middle door and the front end door frame have a reserved gap, and the reserved gap is equal to the forward movement of the middle door under a sharp pitch of the aircraft multiplied by a safety factor.

[0020] Preferably, the safety factor is 1.5.

[0021] Preferably, both side edges of the middle door each have at least one guide roller, door frame supports are fixed on both side door frames, the door frame supports have guide surfaces, the guide rollers are attached to the guide surfaces, and roll along the guide surfaces when the door is opened or closed.

[0022] The present application mainly sets deformation compensation in heading, span and vertical directions.

[0023] In heading: a design gap is reserved between the closed position lock and the lock ring, the front guide notch is slotted and a skin gap is reserved with the front structure to ensure that the door structure deformation compensation structure does not interfere with the main structure under extreme pitch conditions;

[0024] In the span direction: the door is arranged with a front guide and an upper guide. When the door is closed, the front guide works to ensure that the door is within a certain range of the symmetry line of the fuselage. When the door is open, the upper guide works to ensure that the door is within a certain range of the symmetry line of the fuselage.

[0025] In the vertical direction: in order to compensate for the vertical deformation, an over-retraction amount is reserved when arranging the upper locking mechanism and the driving mechanism to ensure that the hatch door is over-retracted. When arranging the lower lock, on the one hand, the over-retraction is arranged by arranging the adjacent hatch door to ensure small vertical deformation. In addition, the use of hook locks and toothed plate lock rings can compensate for the vertical deformation of the lock ring and ensure locking performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1This is a diagram of the deformation compensation structure of the hatch structure and the parts at various positions of a preferred embodiment of the present application. DETAILED DESCRIPTION

[0027] In order to make the technical solution and advantages of the present application clearer, the technical solution of the present application will be further described in detail in detail and in detail in conjunction with the accompanying drawings. It can be understood that the specific embodiments described here are only partial embodiments of the present application, which are only used to explain the present application, not to limit the present application. It should be noted that, for the convenience of description, only the parts related to the present application are shown in the accompanying drawings, and other related parts can refer to the general design. In the absence of conflict, the embodiments in the present application and the technical features in the embodiments can be combined with each other to obtain new embodiments.

[0028] In addition, it should be noted that, unless otherwise clearly specified and limited, the words "installed", "connected", "connected" and similar terms used in the description of this application should be understood in a broad sense. For example, the connection can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, an indirect connection through an intermediate medium, or the internal connection of two components. Technical personnel in the field can understand their specific meanings in this application according to the specific circumstances.

[0029] like Figure 1 As shown, a cabin door structure deformation compensation structure comprises:

[0030] The door frame located at the rear belly, the two side doors D.1 and D.3 hinged on the door frames on both sides, and the middle door D.2 hinged on the rear door frame. The hinge axes of the side doors D.1 and D.3 are parallel to the heading, and the hinge axis of the middle door D.2 is perpendicular to the heading;

[0031] The side doors D.1 and D.3 have multiple locking rings S.2 on their edges, which are installed as follows: Figure 1 As shown, at positions S1, S2, S3, and S4, the two edges of the middle hatch D.2 have a plurality of lock hooks S.1 hooked on the lock ring S.2;

[0032] When opening the hatch, the two side hatches D.1 and D.3 rotate downward along the hinge axis, and the middle hatch D.2 rotates upward along the hinge axis, and the lock hook S.1 hooks the lock ring S.2;

[0033] When the hatch is closed, the middle hatch D.2 rotates downward along the hinge axis, and the lock hook S.1 disengages from the lock ring S.2.

[0034] In some optional embodiments, a guide groove G.1 is provided at the front door frame, the guide groove G.1 has a Y-shaped groove surface, and the front end of the middle hatch D.2 has a guide roller G.2 overlapped on the body, which is installed as shown in FIG. Figure 1 At the G1 position shown, the axis of the guide roller G.2 is parallel to the heading. When the cabin door is closed, the guide roller G.2 enters the groove bottom along the Y-shaped groove surface.

[0035] In some optional embodiments, the heading length of the guide roller G.2 is greater than the heading width of the guide groove G.1, so that there is a gap between the middle door D.2 and the end surface of the guide groove G.1.

[0036] In some optional embodiments, the guide groove G.1 is provided with a margin hole at a position corresponding to the end of the guide roller G.2, so as to compensate for the movement caused by the heading deformation of the middle door D.2.

[0037] In some optional embodiments, when the doors are closed, the side doors D.1 and D.3 have an over-retraction angle, which is the angle formed by the side doors D.1 and D.3 and the middle door D.2. The heights of the side doors D.1 and D.3 are greater than those of the middle door D.2, and the height difference between the side doors D.1 and D.3 and the middle door D.2 does not exceed 5 mm.

[0038] In some optional embodiments, the spanwise width of the guide groove G.1 is equal to the spanwise deformation of the front end of the door in the extreme case plus a set margin.

[0039] In some optional embodiments, a front end surface of the middle door D.2 and the front end door frame have a reserved gap, and the reserved gap is equal to the forward movement of the middle door D.2 under a sharp pitch of the aircraft multiplied by a safety factor of 1.5.

[0040] In some optional embodiments, the two sides of the intermediate door D.2 each have at least one guide roller U.1, forming a lateral guide assembly U, which is respectively installed as follows: Figure 1 At the positions U1 and U2 shown, a door frame support U.2 is fixed on the door frames on both sides, and a guide surface U.3 is provided on the door frame support U.2. The guide roller U.1 is attached to the guide surface U.3 and rolls along the guide surface U.3 when the cabin door is opened or closed.

[0041] The specific scope of this application for margin compensation is in three directions:

[0042] In heading, when the middle door D.2 is in the closed position, the guide roller G.2 of the middle door falls into the front guide slot G.1, and the middle part of the guide slot G.1 has a hole. When the middle door pitches sharply and the heading moves, the guide roller G.2 moves forward and enters the margin hole of the guide slot G.1, which can compensate for the movement caused by heading deformation and prevent the guide roller G.2 from interfering with the guide slot G.1. In addition, a certain gap is reserved between the skin of the middle door D.2 and the front door frame.

[0043] In the vertical direction, when the side doors D.1 and D.3 are closed, they do not stop when they are flush with the middle door D.2, but continue to move until the side doors D.1 and D.3 are over-retracted. Preferably, the over-retraction angle is usually determined according to the width of the door body to ensure that the over-retraction amount is no more than 5mm. In addition, a lock ring S.2 is installed on the side doors D.1 and D.3, and a lock hook S.1 is installed on the middle door D.2. The lock hook S.1 can be adjusted according to the vertical position of the lock ring S.2 to compensate for the vertical deformation.

[0044] In the span direction, when the middle door is closed, the guide roller G.2 of the middle door hits the two guide planes of the front guide groove G.1. The minimum span width of the two guide planes determines the span deformation of the front end of the door. Preferably, the width = the span deformation of the front end of the door in the extreme case + 5mm. When the middle door is opened, the guide roller U.1 of the middle door contacts the U.3 guide surface installed on the fuselage to ensure that the door is located on the symmetry plane of the fuselage when in the upper position. The span width of the guide surface U.3 determines the span deformation of the middle door D.2 in the upper position.

[0045] Preferably, the gap value between the skin of the middle door D.2 and the front door frame can be calculated. The calculation method of this gap value is usually to obtain the forward movement of the middle door D.2 under a sharp pitch condition through finite element simulation. The forward movement amount is multiplied by a safety factor of 1.5 and the result is used as the reserved gap between the skin of the middle door D.2 and the front door frame.

[0046] The above is only a specific implementation of the present application, but the protection scope of the present application is not limited thereto. Any changes or substitutions that can be easily thought of by a person skilled in the art within the technical scope disclosed in the present application should be included in the protection scope of the present application. Therefore, the protection scope of the present application shall be based on the protection scope of the claims.

Claims

1. A door structure deformation compensation structure, characterized in that: include: The door frame located at the rear fuselage belly, the two side doors (D.1, D.3) hinged to the door frames on both sides, and the middle door (D.2) hinged to the rear door frame. The hinge axes of the side doors (D.1, D.3) are parallel to the heading, and the hinge axis of the middle door (D.2) is perpendicular to the heading; The edges of the side doors (D.1, D.3) are provided with a plurality of locking rings (S.2), and the two edges of the middle door (D.2) are provided with a plurality of locking hooks (S.1) hooked on the locking rings (S.2); When the hatch is opened, the two side hatches (D.1, D.3) rotate downward along the hinge axis, the middle hatch (D.2) rotates upward along the hinge axis, and the lock hook (S.1) hooks the lock ring (S.2); When the hatch is closed, the two side hatches (D.1, D.3) rotate upward along the hinge axis, the middle hatch (D.2) rotates downward along the hinge axis, and the lock hook (S.1) is separated from the lock ring (S.2).

2. The door structure deformation compensation structure according to claim 1, characterized in that: A guide groove (G.1) is provided at the front door frame, the guide groove (G.1) has a Y-shaped groove surface, the front end of the middle door (D.2) has a guide roller (G.2) overlapped on the fuselage, the axis of the guide roller (G.2) is parallel to the heading, and when the door is closed, the guide roller (G.2) enters the groove bottom along the Y-shaped groove surface.

3. The door structure deformation compensation structure according to claim 1, characterized in that: The course length of the guide roller (G.2) is greater than the course width of the guide groove (G.1), so that a gap exists between the end surface of the middle door (D.2) and the guide groove (G.1).

4. The door structure deformation compensation structure according to claim 1, characterized in that: The guide groove (G.1) is provided with a margin hole at a position corresponding to the end of the guide roller (G.2) for compensating for the movement caused by the heading deformation of the middle cabin door (D.2).

5. The door structure deformation compensation structure according to claim 1, characterized in that: When the hatch is closed, the side hatches (D.1, D.3) have an over-retraction angle, which is the angle formed by the side hatches (D.1, D.3) and the middle hatch (D.2), and the height of the side hatches (D.1, D.3) is greater than that of the middle hatch (D.2).

6. The door structure deformation compensation structure according to claim 5, characterized in that: The height difference between the side doors (D.1, D.3) and the middle door (D.2) is determined by the total width of the doors.

7. The door structure deformation compensation structure according to claim 6, characterized in that: The height difference between the side doors (D.1, D.3) and the middle door (D.2) shall not exceed 5 mm.

8. The door structure deformation compensation structure according to claim 5, characterized in that: The span width of the guide groove (G.1) is determined by the span deformation of the front end of the door under extreme conditions.

9. The door structure deformation compensation structure according to claim 5, characterized in that: The span width of the guide groove (G.1) is equal to the span deformation of the front end of the door in the limit case plus the set margin.

10. The door structure deformation compensation structure according to claim 1, characterized in that: A reserved gap is provided between the front end surface of the middle cabin door (D.2) and the front end door frame, and the reserved gap is equal to the forward movement amount of the middle cabin door (D.2) when the aircraft pitches sharply multiplied by a safety factor.

11. The door structure deformation compensation structure according to claim 10, characterized in that: The safety factor is 1.

5.

12. The door structure deformation compensation structure according to claim 1, characterized in that: The two side edges of the middle hatch (D.2) are respectively provided with at least one guide roller (U.1), a door frame support (U.2) is fixed on the door frames on both sides, the door frame support (U.2) is provided with a guide surface (U.3), the guide roller (U.1) is attached to the guide surface (U.3), and rolls along the guide surface (U.3) when the hatch door is opened or closed.

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