A pressure relief cover control mechanism using dual preloaded springs to achieve self-locking drive

Abstract

The present invention provides a pressure relief cover control mechanism that utilizes dual preloaded springs to achieve self-locking drive, including a drive assembly and a self-locking limit assembly. The drive assembly utilizes the motion principle of a three-link single-degree-of-freedom mechanism to control the opening and closing motion trajectory of the pressure relief cover. In an emergency, the pressure relief lock is unlocked under the action of an external load, and the drive assembly rapidly opens under the action of a drive spring. The self-locking limit assembly utilizes a limit pin to limit the opening stroke of the drive assembly and relies on a boomerang to reliably lock the drive assembly, ensuring that the pressure relief cover maintains a fixed opening angle and preventing back-drive. The present invention has dual limits, reliable limits, eliminates the need to purchase additional standard finished parts, saves costs, and has a wide range of applications.

Description

Technical Field

[0001] The present invention belongs to the technical field of aircraft design, and relates to a pressure relief cover control mechanism that utilizes dual preloaded springs to achieve driven self-locking, particularly a driven self-locking mechanism involved when the pressure relief cover needs to be automatically opened and pressure relieved when the internal gas pressure of an aircraft body is abnormal. Background Art

[0002] Aircraft typically draw high-temperature, high-pressure gas directly from the engine core to protect the wing leading edges from ice or as a heat source for cabin temperature regulation. Therefore, to prevent accidental leaks from high-pressure gas lines, a common approach is to install pressure relief ducts around these lines to allow the gas to quickly escape from the aircraft, preventing damage to the structure caused by excessive pressure. The function of the pressure relief vent is to automatically open and release high-pressure gas when it senses an internal pressure overload, thus ensuring the integrity of the aircraft structure.

[0003] The control mechanism for the pressure relief flap must be highly reliable. Within the confined space, it must ensure it can open smoothly to the desired position in an emergency to reduce internal pressure within the aircraft structure. It must also lock in place once opened to prevent the flap from being adversely affected by reverse airflow and causing vibration. Therefore, the quality of the pressure relief flap's mechanical design is a key technology for the safety and integrity of the aircraft's local structure. Summary of the Invention

[0004] In order to solve the above problems, the present invention provides a pressure relief cover control mechanism that uses double preloaded springs to achieve self-locking drive, which is used to realize the rapid opening of the pressure relief cover 1. The pressure relief cover 1 includes two symmetrical left and right parts, with a short beam 14 between them. The two ends of the short beam 14 are fixed to two support plates 12. The support plates 12 are hollow shell structures. Both ends of each support plate 12 are fixed to the support 13 by bolts C17. The support 13 is a double-ear support, which is fixed to the body structure. A pressure relief lock 2 is fixed on the pressure relief cover 1 to control the locking state of the pressure relief cover 1, such as Figure 1 .

[0005] The present invention adopts the following technical solutions:

[0006] A pressure relief cover control mechanism that utilizes double preloaded springs to achieve self-locking drive, the pressure relief cover control mechanism includes a drive component 7 and a self-locking limit component 18, the drive component includes two three-link structures and a drive spring 6 connected therebetween, and the movement principle of the three-link single-degree-of-freedom mechanism is utilized to control the opening and closing motion trajectory of the pressure relief cover 1. In an emergency, the pressure relief lock 2 is unlocked under the action of an external load, and the drive component 7 is rapidly opened under the action of the drive spring 6; the function of the self-locking limit component 18 is to utilize a limit pin to eliminate the redundant degrees of freedom of the drive component 7, limit the opening stroke of the drive component 7, and rely on a boomerang to reliably lock the drive component 7, thereby ensuring that the drive component 7 will not be back-driven under the action of external airflow, and ensuring that the pressure relief cover 1 maintains a fixed opening angle.

[0007] The driving assembly 7 includes two groups of the same structure, which are arranged inside the two support plates 12 respectively. Each group of driving assemblies 7 is symmetrical on the left and right, including two gooseneck hinges 3, two gooseneck hinge limit pins 4, two driving connecting rods 5, one driving spring 6, two follower connecting rods 8 and two follower connecting rod limit pins 9; the driving assembly 7 is connected to the support plate 12 and the support 13 on the surrounding body structure, and is opened or closed by switching the locking state of the pressure relief lock 2. Specifically, the gooseneck hinge 3 is a double-ear structure, the two are arranged symmetrically on the left and right, and the ends of the two are connected by bolts A 15 are hinged on the support plate 12 at the same time, and the outer ends of the two gooseneck hinges 3 are respectively connected to the two pressure relief covers 1, so that the pressure relief covers 1 move synchronously with the gooseneck hinges 3; the follower connecting rod 8 is a double-ear structure connecting rod, and one end of the two follower connecting rods 8 is respectively hinged on the outer ends of the two gooseneck hinges 3, and the other ends are respectively hinged to one end of the two driving connecting rods 5, and the other ends of the two driving connecting rods 5 are respectively hinged to the support plate 12 by bolts B16. The gooseneck hinge 3, the follower connecting rod 8 and the driving connecting rod 5 form a three-link mechanism; the two ends of the driving spring 6 are hinged at the middle of the two driving connecting rods 5 near In the position of bolt B16, when the pressure relief cover control mechanism is in the open state, the driving spring 6 is in the stretched state, providing initial power for the movement of the three-bar mechanism, which directly drives the driving link 5 to rotate, and at the same time uses the single degree of freedom principle of the three-bar structure to drive the directional movement of the follower link 8 and the gooseneck hinge 3, thereby driving the pressure relief cover 1 to move; the two gooseneck hinge limit pins 4 are respectively arranged on the inner side of the middle part of the two gooseneck hinges 3 ears, for limiting the movement of the follower link 8, thereby limiting the opening angle of the pressure relief cover 1; the two follower link limit pins 9 are respectively arranged on the inner side of the middle part of the ears of the two follower links 8.

[0008] The self-locking limit assembly 18 also includes two groups of identical structures, which are respectively placed on the inner side of the double ears of the gooseneck hinge 3 of the two groups of drive assemblies 7. Each group of self-locking limit assembly 18 includes two preload springs 10 and two boomerangs 11. The two preload springs 10 are arranged symmetrically on the left and right sides, with their opposite ends hinged to the bolt A15 on the gooseneck hinge 3, and their other ends respectively hung on the two boomerangs 11. One end of the boomerang 11 is connected to the preload spring 10, and the middle part is hinged to the gooseneck hinge limit pin 4, thereby realizing the hinge connection between the boomerang 11 and the gooseneck hinge 3. The boomerang 11 is located between the two ears of the follower link 8, and the other end of the boomerang 11 is provided with a slot. After the gooseneck hinge 3 is opened and rotated to a certain angle, the slot cooperates with the follower link limit pin 9 on the inner side of the ear of the follower link 8, locking the drive assembly 7 and inhibiting its back drive.

[0009] Furthermore, the opening posture of the pressure relief cover control mechanism, that is, the opening angle of the pressure relief cover 1 , is adjusted by adjusting the positions of the gooseneck hinge limit pin 4 and the follower link limit pin 9 .

[0010] When the pressure relief lock 2 locks the pressure relief cover 1 on the body structure, the driving assembly 7 is in a closed state, the gooseneck hinge 3, the follower link 8 and the driving link 5 are all separated to both sides, the driving spring 6 is in a stretched state, and the slot of the boomerang 11 is away from the follower link limit pin 9; after the pressure relief lock 2 is unlocked, the rotational freedom of the driving assembly 7 is released, the driving spring 6 contracts and drives the driving link 5 to rotate, and the gooseneck hinge 3 is moved toward each other along a predetermined trajectory through the three-link mechanism, and the pressure relief cover 1 is opened along with the gooseneck hinge 3; the driving assembly 7 continues to open and move When moving, the follower link 8 contacts the gooseneck hinge limit pin 4, eliminating the extra degrees of freedom in the driving component 7, limiting the continued driving rotation of the gooseneck hinge 3 under the action of the driving spring 6, so that the pressure relief cover 1 reaches a predetermined opening angle. At the same time, the follower link limit pin 9 enters the slot of the boomerang 11. Under the action of the driving spring 6, the preload spring 10 and the gooseneck hinge limit pin 4, the follower link 8 seals the follower link limit pin 9 inside the slot of the boomerang 11, locks the driving component 7 and suppresses its back drive; the closing process moves in the opposite direction accordingly.

[0011] Beneficial effects of the present invention:

[0012] 1. Easy adjustment. The present invention uses a preloaded spring to realize the single-degree-of-freedom structure drive of the three-link mechanism. The opening posture of the mechanism can be adjusted by adjusting the position of the limit pin without changing other structural designs, which greatly reduces the difficulty of adjustment and improves work efficiency.

[0013] 2. Double limit, reliable limit. In the open state, the present invention not only has a tension spring and a boomerang to lock the follower link to fix the position of the drive mechanism when it is open, but the drive spring and the gooseneck hinge limit pin also fix the position of the drive mechanism when it is open, realizing a double limit function and providing a stable discharge channel for high-pressure gas leakage.

[0014] 3. Cost savings: The present invention uses only simple parts to achieve the self-locking design of the drive, eliminating the need to purchase additional standard finished parts, significantly saving the manufacturing and use costs of the drive mechanism.

[0015] 4. Wide range of applications: The present invention has a compact structure, good curved surface applicability, and good practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0016] Figure 1 This is a schematic diagram of the pressure relief cover structure;

[0017] Figure 2 This is a schematic diagram of the installation of the pressure relief cover control mechanism;

[0018] Figure 3 Schematic diagram of the drive component state, where (a) is the closed state and (b) is the open state;

[0019] Figure 4 1. The perspective view of the self-locking limit assembly, wherein (a) is the closed state and (b) is the open state;

[0020] In the figure: 1; pressure relief cover; 2 pressure relief lock; 3 gooseneck hinge; 4 gooseneck hinge limit pin; 5 driving link; 6 driving spring; 7 driving assembly; 8 follower link; 9 follower link limit pin; 10 preload spring; 11 boomerang; 12 support plate; 13 support; 14 short beam; 15 bolt A; 16 bolt B; 17 bolt C; 18 self-locking limit assembly. DETAILED DESCRIPTION

[0021] The specific embodiments of the present invention are further described below in conjunction with the accompanying drawings and technical solutions.

[0022] A pressure relief cover control mechanism that utilizes double preloaded springs to achieve self-locking drive, the pressure relief cover control mechanism includes a drive component 7 and a self-locking limit component 18. The function of the drive component is to utilize the motion principle of a three-link single-degree-of-freedom mechanism to control the opening and closing motion trajectory of the pressure relief cover 1. In an emergency, the pressure relief lock 2 is unlocked under the action of an external load, and the drive component 7 is quickly opened under the action of a drive spring; the function of the self-locking limit component 18 is to utilize a limit pin to eliminate the redundant degrees of freedom of the drive component 7, limit the opening stroke of the drive component 7, and rely on a boomerang to reliably lock the drive component 7, thereby ensuring that the drive component 7 will not be back-driven under the action of external airflow, and ensuring that the pressure relief cover maintains a fixed opening angle.

[0023] like Figure 2 and Figure 3 As shown, the driving assembly 7 includes two groups with the same structure, which are respectively arranged inside the two support plates 12, and each group of driving assemblies 7 is symmetrical on the left and right, including 2 gooseneck hinges 3, 2 gooseneck hinge limit pins 4, 2 driving connecting rods 5, 1 driving spring 6, 2 follower connecting rods 8 and 2 follower connecting rod limit pins 9; the driving assembly 7 is connected to the support plate 12 and the support 13 on the surrounding body structure, and it realizes the open or closed state by switching the locking state of the pressure relief lock 2. Specifically, the gooseneck hinge 3 is a double-ear structure, and the two are arranged symmetrically on the left and right. The ends of the two are hinged to the support plate 12 by bolts A15, and the outer ends of the two gooseneck hinges 3 are respectively connected to the two pressure relief port covers 1, so that the pressure relief port covers 1 move synchronously with the gooseneck hinges 3; the follower connecting rod 8 is a double-ear structure connecting rod, and one end of the two follower connecting rods 8 is respectively hinged to the outer ends of the two gooseneck hinges 3 , the other ends of the two are hinged to one end of the two drive links 5 respectively, and the other ends of the two drive links 5 are hinged to the support plate 12 respectively through bolts B16. The gooseneck hinge 3, the follower link 8 and the drive link 5 form a three-link mechanism; the two ends of the drive spring 6 are hinged at the middle part of the two drive links 5 near the bolt B16. When the pressure relief cover control mechanism is in the open state, the drive spring 6 is in a stretched state, providing initial power for the movement of the three-link mechanism, which directly drives the drive link 5 to rotate, and at the same time uses the single degree of freedom principle of the three-link structure to drive the directional movement of the follower link 8 and the gooseneck hinge 3, thereby driving the pressure relief cover 1 to move; the two gooseneck hinge limit pins 4 are respectively arranged on the inner side of the middle part of the ear pieces of the two gooseneck hinges 3, for limiting the movement of the follower link 8, thereby limiting the opening angle of the pressure relief cover 1; the two follower link limit pins 9 are respectively arranged on the inner side of the middle part of the ear pieces of the two follower links 8.

[0024] like Figure 4 As shown, the self-locking limit assembly 18 also includes two groups of identical structures, respectively placed inside the two ears of the gooseneck hinge 3 of the two sets of drive assemblies 7. Each group of self-locking limit assembly 18 includes two preload springs 10 and two boomerangs 11. The two preload springs 10 are arranged symmetrically, with their opposite ends hinged to bolts A 15 on the gooseneck hinge 3, and their other ends respectively attached to two boomerangs 11. One end of the boomerang 11 is connected to the preload spring 10, and the middle portion is hinged to the gooseneck hinge limit pin 4, thereby achieving the articulated connection between the boomerang 11 and the gooseneck hinge 3. The boomerang 11 is located between the two ears of the follower link 8, and the other end of the boomerang 11 is provided with a slot. When the gooseneck hinge 3 is opened and rotated to a certain angle, the slot engages with the follower link limit pin 9 inside the ear of the follower link 8, locking the drive assembly 7 and inhibiting its backdrive.

[0025] When the pressure relief lock 2 locks the pressure relief cover 1 on the body structure, the driving assembly 7 is in a closed state, the gooseneck hinge 3, the follower link 8 and the driving link 5 are all separated to both sides, the driving spring 6 is in a stretched state, and the slot of the boomerang 11 is away from the follower link limit pin 9; after the pressure relief lock 2 is unlocked, the rotational freedom of the driving assembly 7 is released, the driving spring 6 contracts and drives the driving link 5 to rotate, and the gooseneck hinge 3 is moved toward each other along a predetermined trajectory through the three-link mechanism, and the pressure relief cover 1 is opened along with the gooseneck hinge 3; the driving assembly As component 7 continues to open, follower link 8 contacts gooseneck hinge stop pin 4, eliminating excess degrees of freedom within drive assembly 7 and limiting the continued rotation of gooseneck hinge 3 under the action of drive spring 6. Simultaneously, follower link stop pin 9 enters the slot of boomerang 11. The preload spring 10 and the slot feature of boomerang 11 work together to lock follower link stop pin 9, maintaining pressure relief vent cover 1 at a specific opening angle while suppressing the potential reverse drive movement of drive assembly 7 caused by airflow. Furthermore, as gooseneck hinge 3 drives pressure relief vent cover 1, follower link stop pin 9 first physically contacts boomerang 11. Preload spring 10 generates a torque that inhibits the rotation of boomerang 11, reducing the rotational speed of follower link 8 and minimizing the instantaneous impact on gooseneck hinge stop pin 4. Ultimately, follower link 8 contacts gooseneck hinge stop pin 4, allowing pressure relief vent cover 1 to reach the predetermined opening angle.

Claims

1. A pressure relief cover control mechanism that uses dual preloaded springs to achieve self-locking drive, characterized in that: The pressure relief cover control mechanism includes a drive assembly (7) and a self-locking limit assembly (18); the drive assembly includes two three-link structures and a drive spring (6) connected therebetween, and the three-link structure is used to control the opening and closing motion trajectory of the pressure relief cover (1). In an emergency, the pressure relief lock (2) is unlocked under the action of an external load, and the drive assembly (7) is opened under the action of the drive spring (6); the self-locking limit assembly (18) cooperates with a positioning pin provided on the drive assembly (7) to lock the drive assembly (7), so that the pressure relief cover (1) reaches a predetermined opening angle and avoids back drive; the specific structure of the pressure relief cover control mechanism is as follows: The pressure relief cover control mechanism includes a drive assembly (7) and a self-locking limit assembly (18); The driving assembly (7) includes two groups of identical structures, which are arranged inside two support plates (12) respectively. Each group of driving assemblies (7) is bilaterally symmetrical and includes two gooseneck hinges (3), two gooseneck hinge limit pins (4), two driving connecting rods (5), one driving spring (6), two follower connecting rods (8) and two follower connecting rod limit pins (9); the gooseneck hinge (3) is a double-ear structure, and the two are arranged bilaterally symmetrically. The ends of the two gooseneck hinges (3) are hinged to each other and hinged to the support plate (12). The outer ends of the two gooseneck hinges (3) are respectively connected to the two pressure relief covers (1), so that the pressure relief covers (1) move synchronously with the gooseneck hinges (3); the follower connecting rod (8) is a double-ear structure connecting rod, and the two follower connecting rods ( 8) one end is hinged to the outer end of the two gooseneck hinges (3), and the other ends of the two are hinged to one end of the two driving links (5), and the other ends of the two driving links (5) are hinged to the support plate (12); the two ends of the driving spring (6) are hinged to the middle of the two driving links (5) near the hinge position with the support plate (12), and when the pressure relief cover control mechanism is in the open state, the driving spring (6) is in a stretched state; the two gooseneck hinge limit pins (4) are respectively arranged on the inner side of the middle part of the ear pieces of the two gooseneck hinges (3) for limiting the movement of the follower link (8), thereby limiting the opening angle of the pressure relief cover (1); the two follower link limit pins (9) are respectively arranged on the inner side of the middle part of the ear pieces of the two follower links (8); The self-locking limit assembly (18) also includes two groups of the same structure, which are respectively placed on the inner side of the double ear pieces of the gooseneck hinge (3) of the two drive assemblies (7). Each group of the self-locking limit assembly (18) includes two preload springs (10) and two boomerangs (11); the two preload springs (10) are arranged symmetrically on the left and right, and the opposite ends of the two are hinged at the hinge of the gooseneck hinge (3) and the support plate (12), and the other ends of the two are respectively hung on the two boomerangs (11). The boomerangs ( One end of the boomerang (11) is connected to the preload spring (10), and the middle part is hinged on the gooseneck hinge limit pin (4), thereby realizing the hinge connection between the boomerang (11) and the gooseneck hinge (3), and the boomerang (11) is located between the two ears of the follower link (8). A slot is provided at the other end of the boomerang (11). After the gooseneck hinge (3) is opened and rotated to a certain angle, the slot cooperates with the follower link limit pin (9) on the inner side of the ear of the follower link (8), locking the drive assembly (7) and suppressing its back drive.

2. According to claim 1, a pressure relief cover control mechanism that uses dual preloaded springs to achieve self-locking drive, characterized in that: The gooseneck hinge (3) and the driving connecting rod (5) are hinged to the support plate (12) via bolts.

3. The pressure relief cover control mechanism using dual preloaded springs to achieve self-locking drive according to claim 1, characterized in that: The opening posture of the pressure relief cover control mechanism is adjusted by adjusting the positions of the gooseneck hinge limit pin (4) and the follower link limit pin (9).

4. The pressure relief cover control mechanism using dual preloaded springs to achieve self-locking drive according to claim 1, characterized in that: When the pressure relief lock (2) locks the pressure relief cover (1) on the body structure, the driving assembly (7) is in a closed state, the gooseneck hinge (3), the follower link (8) and the driving link (5) are all separated to both sides, the driving spring (6) is in a stretched state, and the slot of the boomerang (11) is away from the follower link limit pin (9); after the pressure relief lock (2) is unlocked, the driving spring (6) contracts and drives the driving link (5) to rotate, the gooseneck hinge (3) moves towards each other, and the pressure relief cover (1) opens along with the gooseneck hinge (3); when the driving assembly (7) continues to open, the follower link (8) contacts the gooseneck hinge limit pin (4), limiting the gooseneck hinge (3) from continuing to rotate. At the same time, the follower link limit pin (9) enters the slot of the boomerang (11), locking the driving assembly (7) and inhibiting its back drive.

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