Bypass valve driving device for aircraft engine air inlet channel

Abstract

The invention discloses a bypass valve driving device for an aircraft engine air inlet channel, and relates to the technical field of sand prevention devices for airplanes. Comprising a plurality of groups of driving pieces, each driving piece comprises a driving wheel, a driven wheel, a rotating shaft, a universal joint, a steel wire rope, a guide rail and a valve simulation block, the driving wheel and the driven wheel are connected through a single steel wire rope, a sliding block is arranged on the guide rail, the sliding block and the valve simulation block are fixed, and the sliding block is further connected with the steel wire rope through a connecting piece. The universal joint is used for connecting the driving wheel and the rotating shaft, the rotating shaft outputs power to drive the driving wheel to rotate, and the valve simulation block is controlled to move with the steel wire rope as a medium in the rotating process of the driving wheel. After the two adjusting bolts are adjusted in place, the two adjusting bolts are mutually connected and locked through the series steel wire, it is guaranteed that the adjusting bolts do not rotate any more, it is guaranteed that the acting thread depth of the adjusting bolts is not changed, it is guaranteed that the relative positions of the adjusting bolts and the sliding block are not changed, and therefore it is guaranteed that the tensioning degree of the steel wire rope is stable.

Description

Technical Field

[0001] The invention relates to the technical field of helicopter sand prevention devices, in particular to a bypass valve driving device for an aircraft engine inlet duct. Background Art

[0002] Modern helicopters equipped with engine inlet duct cleaning systems are prone to pressure loss and icing during flight. Adding a bypass valve to the sand control system can reduce pressure loss and improve anti-icing capabilities.

[0003] The bypass valve needs to be opened or closed in time, and a driving mechanism is required. Figure 1 As shown, the previous flexible shaft cable bypass valve has several obvious disadvantages. For example: The creep resistance of the flexible shaft cable is poor. The length of the flexible shaft changes after long-term use, resulting in a deterioration in the tension of the wire rope. Although there is a tensioning spring, the tension cannot be controlled.

[0004] The flexible shaft cable is transmitted over a long distance and bypasses the guide wheel, resulting in large energy loss in the middle and poor reliability.

[0005] There is no way to measure and adjust the tension of the guy wires.

[0006] The flexible shaft cable solution involves many trivial parts, which is not conducive to improving reliability.

[0007] A screw drive is required to drive the wire, which adds an extra transmission structure step, has low energy utilization, and is not conducive to improving reliability.

[0008] Another existing solution is to set a central sphere at the front end as a valve intake, such as Figure 2 As shown, the opening and closing of the valve is achieved through the movement of the central sphere, but the internal structure is complex and requires the coordination of pneumatic and electric structures.

[0009] Therefore, a simpler and more reliable bypass valve driving device is needed. In view of the above situation, the present invention proposes a new solution. Summary of the Invention

[0010] The object of the present invention is to provide a bypass valve driving device for an aircraft engine air inlet to solve the problems raised in the above-mentioned background technology.

[0011] To achieve the above-mentioned object, the present invention provides the following technical solution: a bypass valve driving device for an aircraft engine inlet duct, comprising: Several sets of driving parts, including driving wheels, driven wheels, rotating shafts, universal joints, wire ropes, guide rails and valve simulation blocks; The driving wheel and the driven wheel are connected by a single steel wire rope. A slider is arranged on the guide rail. The slider is fixed to the valve simulation block. The slider is also connected to the steel wire rope by a connecting piece. The universal joint is used to connect the driving wheel and the rotating shaft. Power is output at the rotating shaft to drive the driving wheel to rotate. During the rotation of the driving wheel, the valve simulation block is controlled to move with the steel wire rope as the medium.

[0012] Regarding this solution in further detail, a through hole is provided in the driving wheel. Taking the horizontal center line L of the driving wheel as the limit, the through hole is opened from the upper surface of the driving wheel above the horizontal center line L until it penetrates the lower surface of the driving wheel below the horizontal center line L.

[0013] Regarding this solution in further detail, a large arc is provided on one side of the through hole along the first direction. The steel wire rope passes through the surface of the driving wheel along the first direction and passes through the through hole from below the horizontal center line L of the driving wheel. The steel wire rope passes out above the horizontal center line L of the driving wheel. In the forward or reverse rotation state, the main stress points of the steel wire rope are both located at the large arc.

[0014] Regarding this solution in further detail, the connecting piece includes two adjusting bolts and two chucks respectively located at both ends of the steel wire rope. Two threaded holes are respectively provided on the slider. The adjusting bolts are screwed to the threaded holes. Among them, a perforation with a diameter larger than the steel wire rope is provided in the middle of the adjusting bolt. The steel wire rope passes through the perforation and is fixed to the chuck.

[0015] Regarding this solution in further detail, holes are provided around the two adjusting bolts on the connecting piece. After the two adjusting bolts on the connecting piece are adjusted in place, they are connected and interlocked by a series of steel wires.

[0016] Regarding this solution in further detail, the bypass valve driving device further includes: A framework. The valve simulation block moves between the two ends of the framework. The driving wheel and the driven wheel are respectively rotatably installed at the two ends of the framework. The guide rail is installed between the two ends of the framework and close to the steel wire rope.

[0017] Regarding this solution in further detail, a plurality of rotating shafts and universal joints are provided at one end of the framework. The driving wheels of several groups of driving components are connected by the rotating shafts and universal joints to achieve synchronous rotation of the driving wheels.

[0018] Regarding this solution in further detail, a motor shaft is provided at one end of the framework. The motor shaft is coaxially fixed to one of the rotating shafts, and the rotating shaft is driven through the motor shaft.

[0019] Regarding this solution in further detail, a spherical plain bearing is provided on the slider. The slider is connected to the guide rail through the spherical plain bearing to prevent deformation and jamming during the movement of the slider.

[0020] Compared with the prior art, the beneficial effects of the present invention are: 1. After the bypass valve drive device for the aircraft engine inlet is adjusted in place by two adjusting bolts, they are connected and locked to each other by series-connected steel wires, ensuring that the adjusting bolts no longer rotate, that is, ensuring that the threaded depth of the adjusting bolts that takes effect remains unchanged, ensuring that the relative positions of the adjusting bolts and the slider remain unchanged, and thus ensuring the stability of the tension degree of the steel wire rope.

[0021] 2. One side at both ends of the through-hole for the steel wire rope is a large arc. Whether the driving wheel rotates forward or in reverse, the stress position of the steel wire rope is at the large arc, effectively ensuring the minimum turning radius of the steel wire rope, making the stress distribution uniform, reducing stress loss, and improving reliability.

[0022] 3. By observing the state of the series-connected steel wires, it is also possible to understand to a certain extent whether the steel wire rope system fails.

[0023] 4. The components of this solution are relatively few, which can reduce component wear and tear, as well as maintenance costs and difficulties.

[0024] 5. Through-holes are opened on the winding surface of the driving wheel for the steel wire rope to pass through the driving wheel. This operation enables only one steel wire rope to be used on each guide rail, reducing the number of joints by 50% and improving reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 Schematic diagram of the bypass door drive structure using a flexible shaft cable in the prior art of the present invention; Figure 2 Schematic diagram of the structure with a central sphere as the valve inlet of the present invention; Figure 3 Schematic diagram of the structure of the bypass valve in the sand prevention state of the present invention; Figure 4 Schematic diagram of the structure of the bypass valve when the engine of the present invention is in a dust-free state; Figure 5 Schematic diagram of the structure of the bypass valve drive device of the sand prevention device of the present invention; Figure 6 Schematic diagram of the structure of the connecting member between the driving wheel and the driven wheel of the present invention; Figure 7 For the present invention Figure 6 Enlarged structure schematic diagram of part A; Figure 8 Enlarged structure schematic diagram of the connecting member of the present invention; Figure 9 Left axonometric structure schematic diagram of the present invention; Figure 10 For the present invention Figure 9 Enlarged structure schematic diagram of part B; Figure 11Schematic diagram of the cross-section of the driving wheel and the wire winding trend structure of the present invention; Figure 12 Schematic diagram of the cross-section of an embodiment of the driving wheel and the wire winding trend structure of the present invention; Figure 13 Schematic diagram of the cross-section of another embodiment of the driving wheel and the wire winding trend structure of the present invention.

[0026] In the figure: 1. Motor shaft; 2. Rotating shaft; 3. Universal joint; 4. Driving wheel; 41. Through hole; 42. Large arc; 5. Steel wire rope; 6. Driven wheel; 7. Slide block; 8. Guide rail; 9. Flap simulation block; 10. Adjusting bolt; 101. Perforation; 11. Chuck; 12. Skeleton; 13. Series wire; 14. Intake duct lip; 15. Engine air intake; 16. Bypass flap; 17. Converging section; 18. Anti-sand panel. Detailed implementation manners

[0027] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the protection scope of the present invention.

[0028] As Figure 3 shown, the main function of the bypass mechanism is that when sand prevention is not required, the bypass flap 16 is opened to reduce the intake air pressure loss and improve the anti-icing ability. When the helicopter is in a sandy environment, the sand prevention device is started, the sand discharge fan works, and the bypass flap 16 of the sand prevention device is in a closed state. One end of the bypass flap 16 is sealed with the intake duct lip 14, and the other end forms a seal with the converging section 17 of the sand prevention device. At this time, all the air entering the engine passes through the anti-sand panel 18 and then enters the sand prevention device, thereby playing a role in air purification; As Figure 4 shown, when the helicopter is in a dust-free environment, the sand discharge fan stops working, and the bypass flap 16 is opened, that is, the bypass flap 16 is separated from the intake duct lip 14 and axially retracts into the sand prevention device, so that most of the air enters the engine air intake 15 through the channel between the intake duct lip 14 and the sand prevention device to reduce the intake air pressure loss.

[0029] As Figure 5As shown in the figure, the present invention provides a driving scheme for a bypass door of an air intake sand prevention device, which can solve the deficiencies of existing problems. This scheme sets several groups of driving components (including one group). The driving component includes a driving wheel 4, a driven wheel 6, a rotating shaft 2, a universal joint 3, a steel wire rope 5, a guide rail 8, and a valve simulation block 9. The torque is output by the motor shaft 1 and transmitted to each driving wheel 4 through the rotating shaft 2 and the universal joint 3. The driving wheel 4 rotates to pull the steel wire rope 5, driving the valve to complete the opening and closing action. For the convenience of expression, the valve simulation block 9 is used here to replace the bypass door, or it can be understood that the valve simulation block 9 is fixed on the surface of the bypass door. During the movement of the valve simulation block 9, it drives the bypass door to move to realize the opening and closing action of the valve. The torque output by the motor shaft 1 can be used to drive the valve simulation block 9 to reciprocate.

[0030] As Figure 5 shown, specifically, the bypass door driving device of the helicopter sand prevention device includes a framework 12. An XY axis coordinate system is established on one end plane of the framework 12, and a Z axis coordinate system is established in the movement direction of the valve simulation block 9. Equal numbers of clamping slots are respectively arranged at both ends of the framework 12. A driving wheel 4 and a driven wheel 6 are respectively rotatably installed at the clamping slots at both ends. The driving wheel 4 and the driven wheel 6 are connected by a steel wire rope 5. Between both ends of the framework 12, guide rails 8 corresponding to the number of steel wire ropes 5 are arranged. The positions of the guide rails 8 are staggered from the positions of the clamping slots, and the positions of the guide rails 8 are close to the clamping slots. Sliders 7 are slidably arranged on the guide rails 8. Among them, the sliders 7 are also fixedly connected to the valve simulation block 9. The movement of the sliders 7 can make the valve simulation block 9 move synchronously. The sliders 7 are connected to the steel wire rope 5 through connecting pieces.

[0031] As Figure 6 、 Figure 7 and Figure 8As shown in the figure, specifically, the connecting member includes two adjusting bolts 10 and chucks 11 located at both ends of the steel wire rope 5. There is a threaded fit between the adjusting bolt 10 and the slider 7, so as to adjust the length of the steel wire rope 5, that is, the tension degree is adjustable. A perforation 101 larger than the diameter of the steel wire rope 5 is provided in the center of the adjusting bolt 10 to facilitate the steel wire rope 5 to pass through this hole. The steel wire rope 5 is fixed at the chuck 11 by the clamping force generated by the chuck 11. The slightly larger end of the chuck 11 faces the adjusting bolt 10. During the operation, tools such as pliers and wrenches are used to fix the chuck 11, and then the adjusting bolt 10 is turned with a tool. Under the spiral action of the bolt thread, the adjusting bolt 10 moves axially relative to the slider 7, so as to adjust the tightness of the steel wire rope 5. The advantage of using tools to fix the chuck 11 and then turn the adjusting bolt 10 is to prevent the steel wire rope 5 from being damaged when turning the adjusting bolt 10. The periphery of the adjusting bolt 10 is provided with holes for the series connection wire 13 to pass through. After the two adjusting bolts 10 are adjusted in place, they are connected and locked with each other by the series connection wire 13 to ensure that the adjusting bolt 10 no longer rotates, that is, to ensure that the threaded depth of the adjusting bolt 10 that plays a role remains unchanged, to ensure that the relative position between the adjusting bolt 10 and the slider 7 remains unchanged, so as to ensure the stability of the tension degree of the steel wire rope 5. And by observing the state of the series connection wire 13, it is also possible to understand to a certain extent whether the steel wire rope 5 system fails.

[0032] There is a spherical plain bearing between the slider 7 and the guide rail 8, which can allow errors between the guide rail 8 and the valve, and between the guide rail 8 and the guide rail 8, and prevent jamming when the structure deforms.

[0033] Looking back Figure 5 , to ensure the smooth implementation of the above embodiments, it should be understood that a fork arm is provided at each end of the frame 12 along the X-axis direction and the extending direction upward along the Y-axis. A rotating shaft 2 is rotatably installed at each fork arm. The universal joints 3 are distributed along the circumference of the bypass valve 16, and the rotating shaft 2 is connected to the driving wheel 4 through the universal joints 3. That is to say, when the rotating shaft 2 rotates, the driving wheel 4 can be driven to rotate through the universal joints 3 to realize the traction of the steel wire rope 5. A motor shaft 1 is provided on one side of the frame 12, and the output end of the motor shaft 1 is coaxially fixed to the adjacent rotating shaft 2.

[0034] As Figure 9 and Figure 10As shown, to ensure the smooth implementation of the above embodiments, it should be understood that through holes 41 are opened on the wire winding surface of the driving wheel 4 for the wire rope 5 to pass through the driving wheel 4. This operation enables only one wire rope 5 to be used on each guide rail 8, while the traditional transmission mechanism for bypass doors requires two to three wire ropes 5. However, in this design, only one wire rope 5 is used, and one wire rope 5 naturally has two ends, that is, the wire rope 5 is reduced by 50%. Then, the clamps 11 are naturally also reduced by 50%, thus reducing the number of joints by 50% and improving the reliability. The through holes 41 are opened with rounded corners to form large arcs 42. Whether the driving wheel 4 rotates forward or reverses, the stress-bearing position of the wire rope 5 is at the large arc 42, which effectively guarantees the minimum turning radius of the wire rope 5 and makes the stress distribution uniform.

[0035] As Figure 11 , Figure 12 and Figure 13 shown, it should be understood that taking the horizontal midline L from the side view of the driving wheel 4 as the boundary, the through hole 41 is opened on the surface above the horizontal midline L of the driving wheel 4, penetrates through the axis of the driving wheel 4 and then penetrates out from the surface below the horizontal midline L, or the through hole 41 is opened on the surface above the horizontal midline L of the driving wheel 4, bypasses the axis of the driving wheel 4 and then penetrates out from the surface below the horizontal midline L. The through hole 41 can be a through hole with a straight axis or a curved special-shaped hole, and large arcs 42 are opened at both ends of the through hole 41 in the first direction. Under the above conditions, the wire rope 5 passes through the surface of the driving wheel 4 from the first direction and passes through the through hole 41 along the lower part of the horizontal midline L of the driving wheel 4. After the wire rope 5 passes through the driving wheel 4, during the traction process, the stress-bearing position of the wire rope 5 is always located at the large arc 42, which can effectively reduce stress concentration and extend the service life of the wire rope 5.

[0036] For easy understanding, the initial end of the wire rope 5 is fixed at the slider 7 position through a connecting part. The wire rope 5 bypasses the driven wheel 6 and approaches the driving wheel 4, passes through the through hole 41 of the driving wheel 4 after winding half a circle around the driving wheel 4, and then is fixed to the slider 7 through another connecting part after winding another half a circle.

[0037] In summary, after the motor shaft 1 starts, its output torque is transmitted to the driving wheel 4 through the rotating shaft 2 and the universal joint 3. When the driving wheel 4 rotates, the traction closed loop causes the steel wire rope 5 wound between it and the driven wheel 6 to move; the steel wire rope 5 pulls two sliders 7 through the adjusting bolts 10 and the chucks 11 connected at both ends, so that the sliders 7 slide synchronously along the guide rails 8 on the framework 12. The valve simulation block 9 fixed to the sliders 7 moves accordingly, and drives the valve simulation block 9 to complete the opening and closing actions. The forward and reverse rotations of the driving wheel 4 can accurately control the opening of the valve to open the bypass or close the seal for sand prevention. The tension of the steel wire rope 5 can be adjusted by screwing the adjusting bolt 10 after fixing the chuck 11 with a tool, and its position is locked by the series wire 13. The spherical plain bearing design allows a small deviation between the guide rail 8 and the valve, ensuring smooth movement. The large arc 42 and the through hole 41 on the driving wheel 4 optimize the bending stress of the steel wire rope 5 and improve the reliability.

[0038] Although the embodiments of the present invention have been shown and described, it will be understood by those of ordinary skill in the art that various changes, modifications, substitutions and variations can be made in these embodiments without departing from the principles and spirit of the present invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A bypass valve drive device for an aircraft engine intake duct, characterized in that, Comprising: A number of groups of driving members, the driving member including a driving wheel (4), a driven wheel (6), a rotating shaft (2), a universal joint (3), a steel wire rope (5), a guide rail (8) and a valve simulation block (9); The driving wheel (4) and the driven wheel (6) are connected by a single steel wire rope (5). A slider (7) is arranged on the guide rail (8), and the slider (7) is fixed to the valve simulation block (9). The slider (7) is also connected to the steel wire rope (5) by a connecting member to control the tension of the steel wire rope (5); The universal joint (3) is used to connect the driving wheel (4) and the rotating shaft (2) along the circumference of the bypass valve. Power is output at the rotating shaft (2) to drive the driving wheel (4) to rotate. During the rotation of the driving wheel (4), the valve simulation block (9) is controlled to move with the steel wire rope (5) as the medium.

2. The bypass valve driving device for an aircraft engine air intake according to claim 1, characterized in that: A through hole (41) is opened on the driving wheel (4). Taking the horizontal center line L of the driving wheel (4) as the limit, the through hole (41) is opened from the upper surface of the driving wheel (4) above the horizontal center line L until it penetrates the lower surface of the driving wheel (4) below the horizontal center line L.

3. The bypass valve drive device for an aircraft engine intake duct according to claim 2, characterized in that: The through hole (41) is provided with a large arc (42) on one side along the first direction. The steel wire rope (5) passes through the surface of the driving wheel (4) from the first direction and passes through the through hole (41) from below the horizontal center line L of the driving wheel (4). The steel wire rope (5) passes out above the horizontal center line L of the driving wheel (4). In the forward or reverse rotation state, the main stress points of the steel wire rope (5) are both located at the large arc (42).

4. The bypass valve driving device for an aircraft engine air intake according to claim 1, characterized in that: The connecting member includes two adjusting bolts (10) and two chucks (11) respectively located at both ends of the steel wire rope (5). Two threaded holes are respectively opened on the slider (7), and the adjusting bolts (10) are screwed to the threaded holes. Among them, a through hole (101) with a diameter larger than that of the steel wire rope (5) is opened in the middle of the adjusting bolt (10). The steel wire rope (5) passes through the through hole (101) and is fixed at the chuck (11). Under the spiral action of the adjusting bolt (10) and the slider (7), the adjusting bolt (10) moves axially relative to the slider (7) to adjust the tightness of the steel wire rope (5).

5. The bypass valve driving device for an aircraft engine inlet according to claim 1, characterized in that: Holes are opened around the two adjusting bolts (10) on the connecting member. After the two adjusting bolts (10) on the connecting member are adjusted in place, they are connected and interlocked by a series of steel wires (13).

6. The bypass valve driving device for an aircraft engine air intake according to claim 1, characterized in that: The bypass valve driving device further includes: A framework (12), the valve simulation block (9) moves between both ends of the framework (12). The driving wheel (4) and the driven wheel (6) are respectively rotatably installed at both ends of the framework (12), and the guide rail (8) is installed between both ends of the framework (12) and close to the steel wire rope (5).

7. The bypass valve drive device for an aircraft engine air intake according to claim 6, characterized in that: A number of rotating shafts (2) and universal joints (3) are arranged at one end of the framework (12). The driving wheels (4) of a number of groups of driving members are connected by the rotating shafts (2) and the universal joints (3) to realize the synchronous rotation of the driving wheels (4).

8. A bypass valve drive device for an aircraft engine inlet according to claim 7, characterized in that: A motor shaft (1) is arranged at one end of the framework (12), and the motor shaft (1) is coaxially fixed to one of the rotating shafts (2), and the rotating shaft (2) is driven through the motor shaft (1).

9. The bypass valve drive device for an aircraft engine air intake according to claim 1, characterized in that: A spherical plain bearing is provided on the slider (7), and the slider (7) is connected to the guide rail (8) through the spherical plain bearing to prevent deformation and jamming during the movement of the slider (7).

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