A helicopter air intake sand and bird strike protection device

Abstract

The present invention discloses a helicopter air inlet sand and bird collision prevention device, and relates to the technical field of helicopter air inlet protection devices. It comprises a mounting back plate, a flip hinge, an anti-collision net bracket and a protective net, wherein the anti-collision net bracket is connected to the mounting back plate through a flip hinge, a mesh cushion layer is arranged between the protective net and the anti-collision net bracket, the protective net is connected to the anti-collision net bracket through the mesh cushion layer, and a limiting mechanism is arranged in the middle of the mounting back plate and the anti-collision net bracket. The present invention is simple and convenient to operate in the process of use through the arrangement of the mounting back plate, the flip hinge, the anti-collision net bracket and the protective net, and when subjected to the impact of a bird collision, the mounting back plate and the connecting parts do not have structural damage and parts fall off, and has an excellent protective effect, and the device is flipped forward, and the device does not interfere with the fuselage skin, and the connection and fixing can be operated by a latch, which is simple and convenient to operate and has a good protective effect.

Description

Technical Field

[0001] The invention relates to the technical field of helicopter air inlet protection devices, in particular to a helicopter air inlet sand and bird collision prevention device. Background Art

[0002] Modern helicopters are prone to collision with birds near the ground during flight, which can cause damage to the fuselage and components. Especially during takeoff and landing, the flight altitude is low and bird strikes are prone to occur. In order to prevent accidents before they happen, protective measures need to be taken for the engine air inlet purification device equipped on the helicopter to prevent damage to the helicopter engine air inlet purification device caused by bird strikes and to prevent falling objects from entering the engine and causing engine damage.

[0003] Engine air intake duct purification is followed by bird strike protection device (see Figure 1 ), based on the consideration that the size and weight of the subsequent sand and bird strike protection structure are fixed, the design must meet the conditions of the shortest overall structural size and the lightest overall structural weight. The bird strike protection structure needs to have sufficient rigidity and strength within a limited envelope space. After encountering a bird strike, it absorbs the kinetic energy of the bird body through structural deformation, and the structure itself has no serious cracks, and there will be no cracking and falling off of metal parts. Therefore, we propose a new type of helicopter inlet sand and bird strike protection device. Summary of the invention

[0004] The purpose of the present invention is to provide a helicopter air inlet sand and bird strike prevention device, so that after the helicopter encounters a bird strike, the kinetic energy of the bird body can be absorbed through structural deformation without serious cracking of the structure itself, thereby protecting the rear overall sand prevention device from cracking and falling off after encountering a bird strike.

[0005] To achieve the above object, the present invention provides the following technical solution: a helicopter air inlet sand and bird collision prevention device, comprising:

[0006] Install the back panel, flip hinge, anti-collision net bracket and protective net;

[0007] The anti-collision net bracket is connected to the mounting back plate through a flip hinge, a net cushion layer is provided between the protective net and the anti-collision net bracket, and the protective net is connected to the anti-collision net bracket through the net cushion layer;

[0008] A limiting mechanism is provided in the middle of the mounting back plate and the anti-collision net bracket, and the anti-collision net bracket is supported to be positioned through the limiting mechanism after being flipped;

[0009] Reinforcement structures are arranged at both ends of the anti-collision net bracket, one end of one of the reinforcement structures is connected to the mounting back plate by a pin, and the anti-collision net bracket and the mounting back plate form a cage structure to reduce the impact force.

[0010] The protective net is fixed on the anti-collision net bracket, and the anti-collision net bracket is connected to the mounting back plate through a flip hinge. In order to facilitate the opening of the helicopter maintenance panel, the anti-collision net bracket can be flipped at a certain angle through the flip hinge, and the anti-collision net bracket and the mounting back plate are connected by pins to ensure the stability of the aircraft during flight and to enable portable pin pulling operations when flipping is required.

[0011] Further to this solution, the anti-collision net bracket includes a flip frame, which is bent at both ends with a bending angle ranging from 45° to 90°. A mounting bracket strip is fixed to one end of the flip frame, and the flip frame is connected to the flip hinge through the mounting bracket strip.

[0012] Further to this solution, a plurality of transverse reinforcing strips are fixed between the flip frame near the bend, and a plurality of longitudinal reinforcing strips are fixed between the transverse reinforcing strips and the bottom edge strips of the flip frame, and the transverse reinforcing strips and the longitudinal reinforcing strips form a vertical and horizontal mesh structure.

[0013] Further regarding this solution, reinforcing rods 1 and 2 are fixed to one end of the flip frame, and reinforcing rods 3 and 4 are fixed to the other end of the flip frame. The reinforcement structure forms a triangular structure with the two side strips of the flip frame through reinforcing rods 1 and 2 and reinforcing rods 3 and 4.

[0014] Further to this solution, the mounting back panel includes a back panel body, a buckle strip is fixed to one side of the bottom of the back panel body, a through hole is provided at the end of the buckle strip, a pin rod is inserted at the junction of reinforcing rod one and reinforcing rod two, and the pin rod is inserted into the through hole.

[0015] Further to this solution, a hinge connecting strip is fixed to the top of one side of the back plate, and the back plate is connected to the flip hinge through the hinge connecting strip, wherein a recessed groove is provided in the middle of the hinge connecting strip, and a docking strip fixed to the back plate is provided in the recessed groove, and a docking hole is fixed at the end of the docking strip;

[0016] The limiting mechanism includes a hinged protrusion fixed in the middle of the mounting bracket strip, and connecting arms are rotatably connected on both sides of the end of the hinged protrusion, wherein a reinforcement strip is vertically fixed in the middle of the back plate, and a sliding groove is opened in the middle of the reinforcement strip, and a positioning pin hole is opened at the end of the connecting arm, and a connecting bolt is inserted in the positioning pin hole, and the connecting bolt passes through the sliding groove.

[0017] Furthermore, the connecting arm is bent near the end, and a positioning hole is provided at the bent portion. After the anti-collision net bracket is flipped over by a flip hinge, the positioning hole can be coaxial with the docking hole.

[0018] Further to this solution, the mesh pad layer is fixed to the flip frame, and connection holes are opened around the mesh pad layer and penetrate into the flip frame. The protective net includes a mesh piece adapted to the bottom of the mesh pad layer, and the mesh piece is provided with fixing holes corresponding to the connection holes one by one, and a steel mesh is arranged in the middle of the mesh piece.

[0019] Further to this solution, a rubber buffer pad is provided at the connection between the reinforcing rod three and the reinforcing rod four, and a fuselage side support is provided at the rubber buffer pad.

[0020] Further to this solution, the fuselage side support is fixed to the fuselage, a limiting block is fixed on one side of the fuselage side support, a buffer recess is provided on one side of the limiting block, and the buffer recess is adapted to the rubber buffer pad.

[0021] A fixing hole position 1 and a fixing hole position 2 are provided on the mounting back plate, and the fixing hole position 1 and the fixing hole position 2 can be used to install reinforcement parts to increase the strength of the bird-strike prevention device. For example, during use, a reinforcement beam can be fixed between the anti-collision net bracket and the mounting back plate through the fixing hole position 1 and the fixing hole position 2 to improve the overall strength of the bird-strike prevention device, and it can be installed or disassembled according to different weight requirements.

[0022] Compared with the prior art, the present invention has the following beneficial effects:

[0023] The helicopter air inlet sand and bird collision prevention device is provided with a back plate, a flip hinge, an anti-collision net bracket and a protective net. The sand and bird collision prevention device is simple and convenient to operate during use. When subjected to a bird collision impact, the installation back plate and the connecting parts are free of structural damage and parts fall off, and has an excellent protective effect. When the device is flipped forward, the device does not interfere with the fuselage skin, and the connection and fixation can be operated by a latch. The operation is simple and convenient, and the device has a good protective effect.

[0024] At the same time, a triangular structure is formed at both ends of the anti-collision net bracket, which can improve the impact resistance of the anti-collision net bracket 3. The buffer recess on one side is adapted to the rubber buffer pad foot. During the flipping process, the rubber buffer pad foot can automatically rest against the buffer recess. The buffer recess can also prevent the rubber buffer pad foot from falling off after the device is installed. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 It is a schematic diagram of the installation structure of the sand and bird collision prevention device of the present invention;

[0026] Figure 2 It is a schematic diagram of the overall structure of the present invention;

[0027] Figure 3 It is a schematic diagram of the split structure of the present invention;

[0028] Figure 4It is a structural schematic diagram of another viewing angle of the split structure of the present invention;

[0029] Figure 5 It is a schematic diagram of the left-side structure of the split structure of the present invention;

[0030] Figure 6 It is a schematic diagram of the simulation results of the birdshot experiment of the present invention.

[0031] In the figure: 1. Install the back panel; 101. Back panel; 102. Hinge connecting strip; 103. Concave groove; 104. Docking strip; 105. Docking hole; 106. Reinforcement strip; 107. Slide groove; 108. Reinforcement rib 1; 109. Reinforcement rib 2; 110. Buckle strip; 111. Perforation; 112. Fixing hole position 1; 113. Fixing hole position 2; 2. Flip hinge; 3. Anti-collision net bracket; 301. Flip frame; 302. Horizontal reinforcement strip; 303. Vertical reinforcement strip; 304. 4. Reinforcement rod one; 305. Reinforcement rod two; 306. Reinforcement rod three; 307. Reinforcement rod four; 308. Rubber buffer pad; 309. Limit block; 310. Fuselage side support; 311. Buffer notch; 312. Articulated convex strip; 313. Connecting arm; 314. Positioning hole; 315. Connecting bolt; 316. Pin rod; 4. Protective net; 401. Mesh; 402. Wire mesh; 403. Fixing hole; 5. Mesh pad layer; 501. Connecting hole; 6. Install the bracket strip. DETAILED DESCRIPTION

[0032] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0033] like Figure 1 As shown, the present invention provides a technical solution: a helicopter air intake sand and bird strike prevention device, which is installed at the engine air intake purification device to resist bird strike impact and avoid damage to the engine air intake, such as Figure 2 and Figure 3 As shown, the anti-sand and anti-bird collision device includes: an installation back plate 1, a flip hinge 2, an anti-collision net bracket 3 and a protective net 4. The protective net 4 is fixed on the anti-collision net bracket 3. The anti-collision net bracket 3 is connected to the installation back plate 1 through the flip hinge 2. Considering that in order to facilitate the opening of the helicopter maintenance panel, the anti-collision net bracket 3 can be flipped at a certain angle through the flip hinge 2, and the anti-collision net bracket 3 is connected to the installation back plate 1 through a pin plug to ensure the stability of the aircraft during flight and to perform a portable pin pulling operation when flipping is required.

[0034] like Figure 3 As shown, the mounting back panel 1 includes a back panel body 101, a window is provided in the middle of the back panel body 101, and reinforcing ribs 108 are provided around the window. The setting of the window does not affect the connection between the aircraft air inlet and the external air. The setting of the reinforcing ribs 108 can increase the strength of the mounting back panel 1 and reduce the reduction in the strength of the mounting back panel 1 caused by the opening of the window. A hinge connecting strip 102 is fixed to the top of one side of the mounting back panel 1. The hinge connecting strip 102 is connected to the flip hinge 2 and further improves the overall strength of the mounting back panel 1 to a certain extent.

[0035] like Figure 3 and Figure 4 As shown, the anti-collision net bracket 3 includes a flip frame 301, and a mounting bracket strip 6 is fixed at one end of the flip frame 301. The mounting bracket strip 6 is connected to the flip hinge 2 to meet the rotation adjustment of the anti-collision net bracket 3. The two ends of the flip frame 301 are bent. After being connected to the mounting back plate 1 through the flip hinge 2, a cage structure is formed between the flip frame 301 and the mounting back plate 1. The hollow part in the middle allows the bird-collision prevention device to have a sufficient post-collision buffer area, thereby improving the impact resistance of the bird-collision prevention device. A reinforcing rod 1 304 and a reinforcing rod 2 305 are fixed at one end of the anti-collision net bracket 3. The reinforcing rod 1 304 and the reinforcing rod 2 305 are connected to the anti-collision net bracket 3 forms a triangular structure, when impacted, the impact resistance can be significantly improved, a pin rod 316 is inserted at the end of the reinforcing rod 1 304 and the reinforcing rod 2 305, wherein a buckle strip 110 is fixed to the bottom of one side of the mounting back plate 1, and a through hole 111 is provided at the end of the buckle strip 110. The pin rod 316 is inserted in the through hole 111 and can be used to fix the anti-collision net bracket 3. Since the anti-collision net bracket 3 is in direct contact with the mounting back plate 1 through the buckle strip 110, when impacted, the impact of the mounting back plate 1 is relatively large. A circle of reinforcing ribs 109 is arranged around the buckle strip 110, which can significantly increase the impact resistance of the part.

[0036] like Figure 3 and Figure 4As shown, a hinged protrusion 312 is fixed in the middle of the mounting bracket strip 6, and connecting arms 313 are rotatably installed on both sides of the hinged protrusion 312. The connecting arm 313 is connected to the hinged protrusion 312 by bolts and can be disassembled and fixed at any time. In addition, a reinforcement strip 106 is vertically installed in the middle of the mounting back plate 1, and a slide groove 107 is opened in the middle of the reinforcement strip 106. The connecting arm 313 is connected by connecting bolts 315 through the slide groove 107. When the anti-collision net bracket 3 is flipped, one end of the connecting arm 313 can be moved along the slide groove 107. To reduce the instability of flipping, at the same time, a recessed groove 103 is provided in the middle of the hinge connecting strip 102, and a docking strip 104 fixed to the back plate 101 is provided at the recessed groove 103, and a docking hole 105 is provided at the end of the docking strip 104, wherein a bend is provided near the end of the connecting arm 313, and a positioning hole 314 is also provided at the bend. When the anti-collision net bracket 3 is flipped 143°, the positioning hole 314 is coaxial with the docking hole 105, and the pin rod 316 can be inserted there at this time to maintain the stability of the anti-collision net bracket 3 after flipping.

[0037] like Figure 3 , Figure 4 and Figure 5 As shown, a reinforcing rod three 306 and a reinforcing rod four 307 are fixed at one end of the anti-collision net bracket 3, and the reinforcing rod three 306 and the reinforcing rod four 307 also form a triangular structure with the anti-collision net bracket 3 to improve the impact resistance of the anti-collision net bracket 3, and a rubber buffer pad foot 308 is arranged at the connection between the reinforcing rod three 306 and the reinforcing rod four 307, and a fuselage side support 310 is arranged at the rubber buffer pad foot 308, and the fuselage side support 310 is connected to the fuselage, and a limiting block 309 is fixed on one side of the fuselage side support 310, and a buffer recess 311 is provided on one side of the limiting block 309, and the buffer recess 311 is adapted to the rubber buffer pad foot 308, and during the flipping process, the rubber buffer pad foot 308 can automatically abut against the buffer recess 311, and the buffer recess 311 can also prevent the rubber buffer pad foot 308 from falling off after the device is installed.

[0038] A plurality of transverse reinforcing strips 302 are fixed between the two ends of the anti-collision net bracket 3, and a plurality of longitudinal reinforcing strips 303 are fixed between the mounting bracket strip 6 and one side of the anti-collision net bracket 3. The longitudinal reinforcing strips 303 are also bent at the bending part of the anti-collision net bracket 3, and a longitudinal and transverse net body is formed between the longitudinal reinforcing strips 303 and the transverse reinforcing strips 302, which can further block birds or foreign objects that collide with the device, thereby improving the safety strength.

[0039] like Figure 3 , Figure 4 and Figure 5As shown, a mesh cushion layer 5 is arranged between the anti-collision net bracket 3 and the protective net 4. The contour of the mesh cushion layer 5 is adapted to the frame of the anti-collision net bracket 3, and connecting holes 501 are opened around the mesh cushion layer 5, and the connecting holes 501 penetrate the anti-collision net bracket 3, wherein the protective net 4 includes a mesh 401, and the mesh 401 is also provided with fixing holes 403 corresponding to the positions of the connecting holes 501. Therefore, the protective net 4 and the anti-collision net bracket 3 can be fixed by screws. The mesh cushion layer 5 is made of iron sheet. Since the protective net 4 is made of stainless steel and the surface of the anti-collision net bracket 3 is a curved surface, in order to improve the installation strength of the protective net 4, the mesh cushion layer 5 is used to increase the installation strength. The mesh cushion layer 5 is a patch, which can increase the contact area with the protective net 4, reduce the bending degree of the protective net 4, and can significantly improve the strength of the protective net 4. wherein the middle part of the mesh 401 is a steel wire mesh 402.

[0040] The protective net 4 and the anti-collision net bracket 3 are made of 316L stainless steel. The protective net is screwed and installed on the tubular anti-collision net bracket 3 to carry the front bird strike protection. At the same time, in order to facilitate the opening of the helicopter maintenance panel, the anti-collision net structure needs to be flipped upward 143° at the same time to avoid interference between the anti-collision net structure and the fuselage when the sand and bird strike prevention device is flipped forward. The anti-bird strike protection structure mainly includes the protective net 4, the anti-collision net bracket 3, the installation bracket strip 6, the flip hinge 2 and the installation back panel 1.

[0041] Replay Figure 4 A fixing hole position 112 and a fixing hole position 113 are provided on the mounting back plate 1. The fixing hole position 112 and the fixing hole position 113 can be used to install reinforcement members to increase the strength of the bird strike protection device. For example, during use, a reinforcement beam can be fixed between the anti-collision net bracket 3 and the mounting back plate 1 through the fixing hole position 112 and the fixing hole position 113 to improve the overall strength of the bird strike protection device. The device can be installed or disassembled according to different weight requirements.

[0042] In summary, in order to prevent the bird strike net from interfering with the fuselage skin when the sand prevention device is flipped forward, the bird strike prevention device needs to be designed as a flippable structure. When the device is in a non-flipped state, the pin rod 316 plays a locking role in this state, and the rubber buffer foot 308 is inserted into the buffer recess 311 of the fuselage side support 310. When the device needs to be flipped up, the pin rod 316 is pulled out, and the device can be flipped up (143°). The pulled out pin rod 316 is reinserted into the flip-up locking position (the positioning hole 314 is coaxial with the docking hole 105), and the device is fixed and locked in the flipped up state.

[0043] like Figure 6 As shown, the bird bullet experiment was used for verification. The bird bullet weighed 1 kg and had a speed of 297 km / h. It hit the front of the protective device along the course. The simulation calculation results showed that the protective net 4, the anti-collision net bracket 3, the mounting back plate 1 and the connecting fasteners did not suffer from structural damage and parts fell off.

[0044] The assembled helicopter engine air inlet purification device was also verified in the actual bird cannon experiment to prove its protective effect against bird strike protection devices. The overall structure was not damaged and the connecting standard parts did not fall off, which provided good protection for the engine air inlet purification device behind the bird strike protection device.

[0045] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is limited by the attached embodiments and their equivalents.

Claims

1. A helicopter air inlet sand and bird collision prevention device, characterized in that: include: Install the back panel (1), the flip hinge (2), the anti-collision net bracket (3) and the protective net (4); The anti-collision net bracket (3) is connected to the mounting back plate (1) via a flip hinge (2); a net cushion layer (5) is provided between the protective net (4) and the anti-collision net bracket (3); and the protective net (4) is connected to the anti-collision net bracket (3) via the net cushion layer (5); A limiting mechanism is provided in the middle of the mounting back plate (1) and the anti-collision net bracket (3), and supports the anti-collision net bracket (3) to be positioned through the limiting mechanism after being flipped over; Reinforcement structures are provided at both ends of the anti-collision net bracket (3), one end of one of the reinforcement structures is connected to the mounting back plate (1) by a pin, and the anti-collision net bracket (3) and the mounting back plate (1) form a cage-type structure to reduce the impact force; The mounting back plate (1) comprises a back plate body (101), a buckle strip (110) being fixed to one side of the bottom of the back plate body (101), a through hole (111) being provided at the end of the buckle strip (110), wherein a pin rod (316) is inserted at the intersection of the first reinforcing rod (304) and the second reinforcing rod (305), and the pin rod (316) is inserted into the through hole (111); A hinge connection strip (102) is fixed to the top of one side of the back plate (101), and the back plate (101) is connected to the flip hinge (2) via the hinge connection strip (102), wherein a recessed groove (103) is provided in the middle of the hinge connection strip (102), and a docking strip (104) fixed to the back plate (101) is provided in the recessed groove (103), and a docking hole (105) is fixed at the end of the docking strip (104); The limiting mechanism comprises a hinged protrusion (312) fixed in the middle of the mounting bracket strip (6), and connecting arms (313) are rotatably connected to both sides of the end of the hinged protrusion (312), wherein a reinforcement strip (106) is vertically fixed in the middle of the back plate (101), and a slide groove (107) is provided in the middle of the reinforcement strip (106), and a positioning hole (314) is provided at the end of the connecting arm (313), and a connecting bolt (315) is inserted into the positioning hole (314), and the connecting bolt (315) passes through the slide groove (107).

2. The helicopter air inlet sand and bird collision prevention device according to claim 1, characterized in that: The anti-collision net bracket (3) comprises a flip frame (301), the two ends of the flip frame (301) are in a bent state, the bending angle is 90°-45°, a mounting bracket strip (6) is fixed to one end of the flip frame (301), and the flip frame (301) is connected to the flip hinge (2) via the mounting bracket strip (6).

3. The helicopter air inlet sand and bird collision prevention device according to claim 2, characterized in that: A plurality of transverse reinforcement strips (302) are fixed between the turning frame (301) and the bending part, and a plurality of longitudinal reinforcement strips (303) are fixed between the transverse reinforcement strips (302) and the bottom side strips of the turning frame (301). The transverse reinforcement strips (302) and the longitudinal reinforcement strips (303) form a vertical and horizontal mesh structure.

4. The helicopter air inlet sand and bird collision prevention device according to claim 2, characterized in that: A reinforcing rod 1 (304) and a reinforcing rod 2 (305) are fixed to one end of the flip frame (301), and a reinforcing rod 3 (306) and a reinforcing rod 4 (307) are fixed to the other end of the flip frame (301). The reinforcement structure is composed of a triangular structure formed by reinforcing rod 1 (304) and reinforcing rod 2 (305) and reinforcing rod 3 (306) and reinforcing rod 4 (307) and side strips of the flip frame (301).

5. The helicopter air inlet sand and bird collision prevention device according to claim 1, characterized in that: The connecting arm (313) is bent near the end, and a positioning hole (314) is provided at the bent portion. After the anti-collision net bracket (3) is turned over by means of the turning hinge (2), the positioning hole (314) can be coaxial with the docking hole (105).

6. The helicopter air inlet sand and bird collision prevention device according to claim 2, characterized in that: The mesh pad layer (5) is fixed to the turning frame (301), and connection holes (501) are provided around the mesh pad layer (5) and penetrate into the turning frame (301). The protective net (4) comprises a mesh sheet (401) adapted to the bottom of the mesh pad layer (5), and the mesh sheet (401) is provided with fixing holes (403) corresponding to the connection holes (501) one by one, and a steel wire mesh (402) is provided in the middle of the mesh sheet (401).

7. The helicopter air inlet sand and bird collision prevention device according to claim 4, characterized in that: A rubber buffer pad foot (308) is provided at the connection between the reinforcing rod three (306) and the reinforcing rod four (307), and a fuselage side support (310) is provided at the rubber buffer pad foot (308).

8. The helicopter air inlet sand and bird collision prevention device according to claim 7, characterized in that: The fuselage side support (310) is fixed to the fuselage, a limiting block (309) is fixed to one side of the fuselage side support (310), a buffer recess (311) is provided on one side of the limiting block (309), and the buffer recess (311) is adapted to fit the rubber buffer pad foot (308).

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