An intake passage profile adjusting device and a variable intake passage

Abstract

The application discloses an air inlet channel profile adjusting device and a variable air inlet channel, relates to the field of air channel testing devices, and can overcome the defect that the installation and maintenance of the air inlet channel profile adjusting mode using a motor system or a hydraulic system are difficult to a certain extent. The air inlet channel profile adjusting device comprises a first deformation mechanism, the first deformation mechanism is used for changing the shape of an air inlet channel throat wall, the first deformation mechanism comprises a compression plate used for being hinged with the rear end of an air inlet channel forebody, a throat straight plate hinged with the rear end of the compression plate, and an expansion plate hinged with the rear end of the throat straight plate; the throat straight plate is hinged with a connecting rod, the other end of the connecting rod is hinged with a sliding block, the sliding block is hinged with the rear end of the expansion plate, one side of the sliding block is connected with a first driving piece, and the other side of the sliding block is connected with a first reset piece; the first driving piece can drive the sliding block to move and further adjust the angle of the connecting rod relative to the throat straight plate; and the first driving piece comprises a first driving strip made of SMA wire.

Description

Technical Field

[0001] This application relates to the field of air intake testing equipment, and more particularly to an air intake profile adjustment device and a variable air intake. Background Technology

[0002] As a key component of aircraft, the air intake's performance directly impacts the propulsion efficiency of the propulsion system and even the overall performance of the aircraft. With the development of the aircraft field, research has reached a point where it is difficult to further improve the performance of conventional geometry air intakes. This improvement involves using surface design and optimization to efficiently provide air with specific pressures, temperatures, and flow rates to different engines across a wide Mach number range. Therefore, the current aircraft field requires a variable geometry air intake design that adjusts the air intake profile in stages according to flight conditions to improve engine performance under different Mach number conditions.

[0003] The existing technology discloses that the air intake profile is adjusted by using a motor system or hydraulic system to drive a linkage mechanism, thereby changing the profile and thus achieving the purpose of adjusting the propulsion performance of the aircraft.

[0004] Because the motor system or hydraulic system that drives the linkage mechanism is relatively complex in structure and has a heavy weight, the intake duct profile adjustment method disclosed in related technologies is difficult to install and maintain. Summary of the Invention

[0005] The embodiments of this application provide an intake duct profile adjustment device and a variable intake duct, which can overcome to some extent the shortcomings of using a motor system or hydraulic system for intake duct profile adjustment, which is difficult to install and maintain.

[0006] To achieve the above objectives, the embodiments of this application adopt the following technical solutions:

[0007] In a first aspect, this application provides an intake duct profile adjustment device, which includes a first deformation mechanism for changing the shape of the intake duct throat wall. The first deformation mechanism includes a compression plate for hinged to the rear end of the intake duct front body, a throat straight plate hinged to the rear end of the compression plate, and an expansion plate hinged to the rear end of the throat straight plate.

[0008] The throat and other straight plates are hinged to a connecting rod, and the other end of the connecting rod is hinged to a slider. The slider is hinged to the rear end of the expansion plate. One side of the slider is connected to a first driving member, and the other side of the slider is connected to a first resetting member.

[0009] The slider is hinged to the rear end of the expansion plate; the first driving member can drive the slider to move and thereby adjust the angle of the connecting rod relative to the throat or other straight plate; the angle between the connecting rod and the plane where the throat or other straight plate is located is greater than 0° and less than 90°; the first driving member includes a first driving bar made of SMA wire, and the first reset member is used to drive the slider to move to the initial position.

[0010] Optionally, the first deformation mechanism further includes:

[0011] At least one guide rod is used for fixed connection with the intake support, and the guide rod is arranged along the front end of the straight plate such as the throat and toward the rear end;

[0012] The slider has a guide hole for the guide rod to pass through, and the slider reciprocates along the length of the guide rod.

[0013] Optionally, the first deformation mechanism further includes:

[0014] At least one reciprocating bearing, the outer ring of which is fixedly connected to the guide hole, wherein the reciprocating bearing is arranged in a direction parallel to the opening direction of the guide hole;

[0015] The guide rod is fixedly connected to the inner ring of the reciprocating bearing, and the guide rod slides along the opening direction of the guide hole through the reciprocating bearing.

[0016] Optionally, the first driving component includes a wire-locking block and an insulating plate made of insulating material;

[0017] One end of the first drive bar is fixedly connected to the locking wire block, and the other end of the first drive bar is fixedly connected to the insulating plate;

[0018] A guide strip is fixedly connected to the side of the locking block near the slider; a guide groove is provided on the side wall of the slider away from the first reset member, and the guide strip extends into the guide groove; the locking block and the slider are detachably connected.

[0019] Optionally, a connecting groove is provided on the side of the slider near the first reset member, one end of the first reset member extends into the connecting groove, and one end of the first reset member is fixedly connected to the slider by bolt connection.

[0020] Optionally, it also includes a second deformation mechanism for changing the shape of the intake manifold front wall. The second deformation mechanism includes a pressure relief plate with one side wall for connecting with the intake manifold front, and the pressure relief plate is made of metal.

[0021] A traction rope is fixedly connected to the bottom of the pressure relief plate. A sliding bar is also connected to the end of the traction rope away from the pressure relief plate. A second driving component is fixedly connected to one side of the sliding bar, and a second reset component is fixedly connected to the other side of the sliding bar.

[0022] The second driving component includes a second driving bar made of SMA wire. The length direction of the second driving bar is the same as the length direction of the first reset component. The second reset component is used to drive the sliding bar to move to the initial position.

[0023] Optionally, the second deformation mechanism further includes a limiting block, which has a limiting groove for the traction rope to pass through;

[0024] The limiting block is used to be fixedly connected to the front body of the air intake; the opening direction of the limiting groove is parallel to the length direction of the second drive bar.

[0025] Optionally, the second deformation mechanism further includes a pulley, the pulley having a groove along its circumference, the pulley being rotatably connected to the limiting groove, and the groove being opened in a direction parallel to the opening direction of the limiting groove.

[0026] Optionally, multiple second drive bars and multiple second reset members are provided, with each second drive bar aligned with the axial direction of one of the second reset members.

[0027] Secondly, this application provides a variable air intake, employing an air intake profile adjustment device as described above.

[0028] One or more technical solutions provided in the embodiments of this application have at least the following technical effects or advantages:

[0029] In this embodiment, a first drive bar made of SMA wire drives the slider. Since SMA wire has the characteristic of shortening in length when voltage is applied, the first drive bar shortens in length after being energized, driving the slider to move. The potential energy of the first reset member gradually increases. During the movement, the slider drives the connecting rod to rotate around the hinge axis. The angle between the connecting rod and the straight plates such as the throat gradually increases. The connecting rod pushes the straight plates such as the throat to protrude from the inner wall of the intake duct. The straight plates such as the throat drive the compression plate and the expansion plate to form a structure that changes the intake duct profile, thereby achieving the purpose of adjusting the intake duct profile structure. Compared with the method of using a motor system or hydraulic system to adjust the intake duct profile, it has the advantage of simple structure and can greatly reduce the installation and maintenance difficulty of the intake duct profile adjustment device.

[0030] After the first drive bar is de-energized, the first reset component drives the slider to move to its original position. The slider drives the connecting rod to rotate around the hinge axis, so that the straight plate, compression plate and expansion plate of the throat, etc., form the same plane, which facilitates the rapid restoration of the intake duct profile to the initial position and improves the convenience of studying the influence of the intake duct profile on fluid velocity. Attached Figure Description

[0031] To more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the drawings used in the description of the embodiments of the present invention or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0032] Figure 1 A schematic diagram of the first deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application;

[0033] Figure 2 Another structural schematic diagram of the first deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application;

[0034] Figure 3 A perspective sectional view of the first deformation mechanism of the air intake profile adjustment device provided in the embodiment of this application;

[0035] Figure 4 A perspective sectional view of the first deformation mechanism of the air intake profile adjustment device provided in the embodiment of this application;

[0036] Figure 5 A schematic diagram of the second deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application;

[0037] Figure 6 A schematic diagram of the second deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application from another perspective;

[0038] Figure 7 A perspective sectional view of the second deformation mechanism of the intake duct profile adjustment device provided in the embodiment of this application;

[0039] Figure 8 A perspective sectional view of the second deformation mechanism of the air intake profile adjustment device provided in the embodiment of this application;

[0040] Figure 9 for Figure 8 Enlarged view of section A.

[0041] Reference numerals: 1. First deformation mechanism; 11. Compression plate; 12. Straight plate such as throat; 13. Expansion plate; 14. Connecting rod; 15. Slider; 151. Connecting groove; 152. Guide hole; 153. Guide groove; 16. First driving component; 161. First driving bar; 162. Locking block; 163. Insulating plate; 164. Guide bar; 17. First reset component; 18. Guide rod; 19. Reciprocating bearing; 2. Second deformation mechanism; 21. Pressure relief plate; 22. Traction rope; 23. Sliding block; 24. Second driving component; 241. Second driving bar; 242. Locking post; 243. Insulating block; 25. Second reset component; 26. Limiting block; 261. Limiting groove; 27. Pulley; 271. Slide groove; 3. Intake duct front body. Detailed Implementation

[0042] The technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some, not all, of the embodiments of the present invention. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0043] In the description of the embodiments of the present invention, it should be noted that the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are used only for the convenience of describing the embodiments of the present invention and for simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on the present invention. The terms "first," "second," and "third" are used for descriptive purposes only and should not be construed as indicating or implying relative importance. Furthermore, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in the embodiments of the present invention according to the specific circumstances.

[0044] To facilitate the study of the influence of the inlet profile shape on the fluid motion within the inlet, it is necessary to use inlet profiles with different shapes to measure various flow parameters within the inlet. When fitting equations to obtain the relationship between different inlet profile shapes and the fluid motion within the inlet, constructing inlet profiles with different shapes not only leads to a sharp increase in research costs but also requires a large amount of floor space. Therefore, variable inlet profiles that can change the shape of the inlet have come into the researchers' view.

[0045] Reference Figure 1 , Figure 2 and Figure 3 , Figure 1 A schematic diagram of the first deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application; Figure 2 Another structural schematic diagram of the first deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application; Figure 3 A perspective sectional view of the first deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application.

[0046] In some embodiments, this application discloses an intake duct profile adjustment device, which includes a first deformation mechanism 1. The first deformation mechanism 1 is used to change the shape of the intake duct throat wall. The first deformation mechanism 1 includes a compression plate 11 for hinged to the rear end of the intake duct front body 3, a throat straight plate 12 hinged to the rear end of the compression plate 11, and an expansion plate 13 hinged to the rear end of the throat straight plate 12.

[0047] The throat and other straight plates 12 are hinged to a connecting rod 14, and the other end of the connecting rod 14 is hinged to a slider 15. The slider 15 is hinged to the rear end of the expansion plate 13. One side of the slider 15 is connected to a first driving member 16, and the other side of the slider 15 is connected to a first resetting member 17.

[0048] The slider 15 is hinged to the rear end of the expansion plate 13; the first driving member 16 can drive the slider 15 to move and thereby adjust the angle of the connecting rod 14 relative to the throat and other straight plates 12; the included angle between the connecting rod 14 and the plane where the throat and other straight plates 12 are located is greater than 0° and less than 90°; the first driving member 16 includes a first driving strip 161 made of SMA wire; the first reset member 17 is used to drive the slider 15 to move to the initial position. The first reset member 17 is an elastic element that can undergo elastic deformation, such as a rubber band or a spring. In this embodiment, the first reset member 17 is set as a spring. The setting direction of the first reset member 17 is parallel to the length direction of the first driving strip 161. One end of the first reset member 17 is connected to the slider 15 by bolts, and the other end of the first reset member 17 is connected to the intake support by bolts.

[0049] The first drive bar 161, made of SMA wire, drives the slider 15 to move. Since SMA wire has the characteristic of shortening in length after voltage is applied, the first drive bar 161 shortens in length after being energized, driving the slider 15 to move. The potential energy of the first reset member 17 gradually increases. During the movement, the slider 15 drives the connecting rod 14 to rotate around the hinge axis. The angle between the connecting rod 14 and the throat straight plate 12 gradually increases. The connecting rod 14 pushes the throat straight plate 12 to protrude from the inner wall of the intake duct. The throat straight plate 12 drives the compression plate 11 and the expansion plate 13 to form a structure that changes the intake duct profile, thereby achieving the purpose of adjusting the intake duct profile structure. Compared with the method of using a motor system or hydraulic system to adjust the intake duct profile, it has the advantage of simple structure and can greatly reduce the installation and maintenance difficulty of the intake duct profile adjustment device.

[0050] After the first drive bar 161 is de-energized, the first reset member 17 drives the slider 15 to move to its original position. The slider 15 drives the connecting rod 14 to rotate around the hinge axis, so that the throat and other straight plates 12, compression plates 11 and expansion plates 13 form the same plane, which facilitates the rapid restoration of the intake duct profile to the initial position and improves the convenience of studying the influence of different intake duct profiles on fluid velocity.

[0051] In some embodiments, in order to reduce the probability of the connection between the end of the first reset member 17 and the slider 15 disengaging, a connecting groove 151 is provided on the side wall of the slider 15 near the first reset member 17. The connecting groove 151 is opened in the horizontal direction, and the end of the first reset member 17 extends into the connecting groove 151. A bolt for fixing the end of the first reset member 17 is provided on the slider 15. The end of the bolt extends into the connecting groove 151, so that the bolt and the first reset member 17 are connected as one.

[0052] In some embodiments, in order to reduce the probability that the slider 15 deviates from its direction of motion during the movement driven by the first drive bar 161, the first deformation mechanism 1 provided in this application further includes at least one guide rod 18. The guide rod 18 is fixedly connected to the intake port bracket by a threaded connection. The guide rod 18 is arranged along the front end of the throat plate 12 toward the rear end of the throat plate 12.

[0053] The slider 15 has guide holes 152 for the guide rods 18 to pass through. The number of guide holes 152 is the same as the number of guide rods 18. The guide rods 18 extend into the guide holes 152, and the slider 15 reciprocates along the length of the guide rods 18.

[0054] When the first drive bar 161 is energized, its length shortens due to the inherent characteristics of the SMA wire. The first drive bar 161 pulls the slider 15 to move. The slider 15 slides along the length direction of the guide rod 18 under the limit of the guide rod 18. The slider 15 drives the connecting rod 14 to rotate around the hinge axis. The end of the connecting rod 14 away from the slider 15 pushes the throat and other straight plates 12 to move. The throat and other straight plates protrude from the inner wall of the air intake. The throat and other straight plates 12 drive the compression plate 11 and the expansion plate 13 to rotate and protrude from the inner wall of the air intake, forming a structure that changes the air intake profile. When the first drive bar 161 is de-energized, the first reset member 17 drives the slider 15 to slide in the opposite direction along the length direction of the guide rod 18 through its own elasticity. The slider 15 drives the connecting rod 14 to pull the throat and other straight plates 12 to move. The throat and other straight plates, the compression plate 11, and the expansion plate 13 gradually move to the same plane, thereby improving the recovery speed of the air intake profile deformation.

[0055] In some embodiments, in order to reduce the probability of wear on the guide rod 18 during the sliding of the slider 15, the first deformation mechanism 1 provided in this application further includes a reciprocating bearing 19. The number of reciprocating bearings 19 is the same as the number of guide rods 18. The outer ring of the reciprocating bearing 19 is connected to the slider 15 by bolts. The inner ring of the reciprocating bearing 19 is fixedly connected to the guide rod 18. The axial direction of the reciprocating bearing 19 is parallel to the length direction of the guide rod 18.

[0056] When the first drive bar 161 is subjected to voltage to shorten its own length and drive the slider 15 to move, the slider 15 causes the inner and outer rings of the reciprocating bearing 19 to slide relative to each other. The reciprocating bearing 19 can protect the outer wall of the guide rod 18, thereby reducing the probability of wear on the outer wall of the guide rod 18. At the same time, by setting the reciprocating bearing 19 between the guide rod 18 and the slider 15, the friction between the guide rod 18 and the slider 15 can be reduced, thereby reducing the probability of wear during the movement of the slider 15 driven by the first drive bar 161.

[0057] Reference Figure 4 , Figure 4 This is a perspective sectional view of the first deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application.

[0058] In some embodiments, since the first drive bar 161 will wear out during long-term use, in order to improve the convenience of replacing the first drive bar 161, the first drive component 16 provided in this application also includes a locking block 162 and an insulating plate 163 made of insulating material; the locking block 162 and the insulating plate 163 are both made of plastic, one end of the first drive bar 161 is fixedly connected to the locking block 162 by adhesive, and the other end of the first drive bar 161 is fixedly connected to the insulating plate 163 by adhesive. The insulating plate 163 has a through mounting hole for the first drive bar 161 to pass through, and the insulating plate 163 is integrated with the air intake bracket by mortise and tenon joint.

[0059] A guide strip 164 is integrally connected to the side of the locking block 162 near the slider 15. The cross-section formed by the guide strip 164 and the locking block 162 is a horizontal T-shape. A guide groove 153 is provided on the side wall of the slider 15 away from the first reset member 17, and the guide strip 164 extends into the guide groove 153. A through bolt is provided between the guide strip 164 and the slider 15. The guide strip 164 and the slider 15 are connected as one piece by the through bolt, thereby realizing the detachable connection between the locking block 162 and the slider 15.

[0060] When the first drive bar 161 wears out during long-term use, the guide bar 164 and the slider 15 are disconnected by removing the bolts connecting them. The guide bar 164 and the slider 15 are then removed from the guide groove 153, and the connection between the first drive bar 161 and one end of the slider 15 is separated. Then, the other end of the first drive bar 161 is separated from the mounting hole of the insulating plate 163, and the replaced first drive bar 161 is passed through the mounting hole and connected to the insulating plate 163. This achieves separation of the end of the first drive bar 161 from the insulating plate 163, improving the efficiency of replacing the worn first drive bar 161.

[0061] Reference Figure 5 , Figure 6 and Figure 7 , Figure 5 A schematic diagram of the second deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application; Figure 6 A schematic diagram of the second deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application from another perspective; Figure 7 A perspective sectional view of the second deformation mechanism of the intake duct profile adjustment device provided in the embodiments of this application.

[0062] In some embodiments, in order to further improve the applicability of the intake duct profile adjustment device provided in this application, the intake duct profile adjustment device provided in this application further includes a second deformation mechanism 2, which is used to change the shape of the wall surface of the intake duct front body 3.

[0063] The second deformation mechanism 2 includes a pressure relief plate 21 with one side wall for connecting to the intake manifold 3. The top wall of the pressure relief plate 21 and the top wall of the intake manifold 3 are located in the same plane. The pressure relief plate 21 is made of metal material. In this embodiment, the material of the pressure relief plate 21 is 30CrMnSiA alloy steel. The pressure relief plate 21 is connected to the intake manifold 3 by bolts through a cantilever. The side of the pressure relief plate 21 connected to the intake manifold 3 is thicker. A traction rope 22 is also fixedly connected to the suspended side of the pressure relief plate 21. The traction rope 22 is used to drive the pressure relief plate 21 to undergo elastic deformation, thereby forming a gap for fluid to leave the intake manifold. The traction rope 22 includes a die-cast head steel wire rope. The traction rope 22 is fixedly connected to the pressure relief plate 21 through its own die-cast head.

[0064] The end of the traction rope 22 away from the pressure relief plate 21 is connected to a sliding bar via a locking post 242. A second drive member 24 is fixedly connected to one side of the sliding bar, and a second reset member 25 is fixedly connected to the other side of the sliding bar. The second drive member 24 includes a second drive bar 241 made of SMA wire, and the length direction of the second drive bar 241 is the same as the length direction of the first reset member 17. One end of the second drive bar 241 is connected to the sliding bar via the locking post 242, and an insulating stop 243 is also provided at the connection point. The other end of the second drive bar 241 is fixedly connected to the intake manifold front body 3 by means of a clamping block and the insulating stop 243 cooperating.

[0065] The second reset member 25 is used to drive the sliding bar to the initial position. The second reset member 25 is an elastic member that can undergo elastic deformation, such as a rubber band or a spring. In this embodiment, the second reset member 25 is set as a spring. The setting direction of the second reset member 25 is parallel to the length direction of the second drive bar 241. One end of the second reset member 25 is connected to the sliding block 23 by bolts, and the other end of the second reset member 25 is connected to the intake manifold front body 3 by bolts.

[0066] The second drive bar 241, made of SMA wire, drives the sliding block 23 to move. Since SMA wire has the characteristic of shortening in length after voltage is applied, the second drive bar 241 shortens in length after being energized, driving the sliding block 23 to move. The potential energy of the second reset member 25 gradually increases. During the movement, the sliding block 23 drives the traction rope 22 to move. The traction rope 22 causes the suspended side of the pressure relief plate 21 to deform, thereby forming a gap between the pressure relief plate 21 and the intake duct front body 3 for fluid to leave the intake duct. This achieves the purpose of adjusting the wall shape of the intake duct front body 3. When used in conjunction with the first deformation mechanism 1, it can greatly improve the efficiency of studying the influence of intake duct profile shape changes on fluid movement in the intake duct, and can also greatly reduce the installation and maintenance difficulty of the intake duct profile adjustment device.

[0067] After the second drive bar 241 is de-energized, the second reset member 25 uses its own elastic potential energy to pull and drive the sliding block 23 to move back to its original position. The force on the traction rope 22 between the sliding block 23 and the pressure relief plate 21 gradually decreases. The pressure relief plate 21 gradually moves to a state that is level with the inlet front body 3 through its own elasticity. This can improve the efficiency of the inlet returning to the state when no fluid is introduced and improve the convenience of studying the influence of different shaped inlet profiles on fluid velocity.

[0068] Reference Figure 8 and Figure 9 , Figure 8 A perspective sectional view of the second deformation mechanism of the air intake profile adjustment device provided in the embodiment of this application; Figure 9 for Figure 8 Enlarged view of section A.

[0069] In some embodiments, in order to reduce the probability that the direction of movement of the traction rope 22 deviates under the action of the sliding block 23 and the second drive bar 241, the second deformation mechanism 2 provided in this application further includes a limiting block 26. The limiting block 26 has a limiting groove 261 for the traction rope 22 to pass through. The limiting block 26 is connected to the air intake front body 3 by bolts. The opening direction of the limiting groove 261 is parallel to the setting direction of the second drive bar 241. The width of the limiting groove 261 is equal to the width of the traction rope 22.

[0070] When the second drive bar 241 drives the sliding block 23 to move, the sliding block 23 drives the traction rope 22 to move. Since the traction rope 22 is blocked by the limiting groove 261, the movement direction of the traction rope 22 is the same as the movement direction of the sliding block 23. The traction rope 22 drives the pressure relief plate 21 to bend elastically, thereby creating a gap between the pressure relief plate 21 and the intake manifold 3.

[0071] In some embodiments, the second deformation mechanism 2 provided in this application further includes a pulley 27, which is rotatably connected to the limiting groove 261. The rotation axis of the pulley 27 is perpendicular to the opening direction of the limiting groove 261. The pulley 27 has a groove 271 along its circumference, and the opening direction of the groove 271 is parallel to the opening direction of the limiting groove 261.

[0072] As the pulley 27 rotates within the limiting groove 261, the traction rope 22 moves around the groove 271 on the side of the pulley 27. When the sliding block 23 drives the traction rope 22 to move, the length of the traction rope 22 between the pulley 27 and the pressure relief plate 21 gradually shortens, thereby causing the traction rope 22 to drive the pressure relief plate 21 to undergo elastic deformation under force.

[0073] In some embodiments, multiple second drive bars 241 and second reset members 25 are provided, and each second drive bar 241 is located on the same straight line as the axis of a second reset member 25.

[0074] By setting multiple second drive bars 241 and second reset pieces 25, with the second drive bars 241 and the second reset pieces 25 being set correspondingly, the probability of the second drive bar 241 shifting during the movement of the sliding block 23 is reduced, thereby facilitating the movement of the traction sliding bar and improving the overall smooth deformation of the pressure relief plate 21 during the deformation process.

[0075] In some embodiments, based on the intake duct profile adjustment device disclosed in the above technical solution, this application also provides an intake duct, the intake duct including an intake duct throat, the first deformation mechanism 1 provided in the above technical solution being fixedly connected to the intake duct throat, for changing the profile shape of the intake duct throat, thereby improving the convenience of studying the influence of the intake duct profile shape on the fluid inside the intake duct.

[0076] In this embodiment, a first drive bar 161 made of SMA wire drives the slider 15 to move. Since SMA wire has the characteristic of shortening in length after voltage is applied, the first drive bar 161 shortens in length after being energized, driving the slider 15 to move. The potential energy of the first reset member 17 gradually increases. During the movement, the slider 15 drives the connecting rod 14 to rotate around the hinge axis. The angle between the connecting rod 14 and the throat straight plate 12 gradually increases. The connecting rod 14 pushes the throat straight plate 12 to protrude from the inner wall of the intake duct. The throat straight plate 12 drives the compression plate 11 and the expansion plate 13 to form a structure that changes the intake duct profile, thereby achieving the purpose of adjusting the intake duct profile structure. Compared with the method of using a motor system or hydraulic system to adjust the intake duct profile, it has the advantage of simple structure and can greatly reduce the installation and maintenance difficulty of the intake duct profile adjustment device.

[0077] After the first drive bar 161 is de-energized, the first reset member 17 drives the slider 15 to move back to its original position. The slider 15 then drives the connecting rod 14 to rotate around the hinge axis, thereby making the throat plate 12, compression plate 11, and expansion plate 13 form the same plane. This facilitates the rapid restoration of the intake duct profile to its initial position and improves the convenience of studying the influence of the intake duct profile on fluid velocity. The various embodiments in this specification are described in a progressive manner. The same or similar parts between the various embodiments can be referred to mutually. Each embodiment focuses on describing the differences from other embodiments.

[0078] The above embodiments are only used to illustrate the technical solutions of this application, and are not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art should understand that modifications can still be made to the technical solutions described in the foregoing embodiments, or equivalent substitutions can be made to some or all of the technical features therein. Such modifications or substitutions do not cause the essence of the corresponding technical solutions to deviate from the scope of the technical solutions of this application.

Claims

1. An intake duct profile adjustment device, characterized in that, It includes a first deformation mechanism, which is used to change the shape of the intake throat wall. The first deformation mechanism includes a compression plate for hinged to the rear end of the intake front body, a straight plate such as the throat for hinged to the rear end of the compression plate, and an expansion plate for hinged to the rear end of the straight plate such as the throat. The throat and other straight plates are hinged to one end of the connecting rod, and the other end of the connecting rod is hinged to a slider. The slider is hinged to the rear end of the expansion plate. One side of the slider is connected to a first driving member, and the other side of the slider is connected to a first resetting member. The first driving component can drive the slider to move and thereby adjust the angle of the connecting rod relative to the straight plate such as the throat; the angle between the connecting rod and the plane where the straight plate such as the throat is located is greater than 0° and less than 90°; the first driving component includes a first driving strip made of SMA wire, and the first reset component is used to drive the slider to move to the initial position, and the setting direction of the first reset component is parallel to the length direction of the first driving strip; The first deformation mechanism further includes: At least one guide rod is provided for fixed connection with the intake duct support, and the guide rod is arranged along the front end of the straight plate such as the throat duct toward the rear end; The slider has a guide hole for the guide rod to pass through, and the slider reciprocates along the length of the guide rod. The first driving component includes a wire-locking block and an insulating plate made of insulating material; One end of the first drive bar is fixedly connected to the locking wire block, and the other end of the first drive bar is fixedly connected to the insulating plate; A guide strip is fixedly connected to the side of the locking block near the slider; a guide groove is provided on the side wall of the slider away from the first reset member, and the guide strip extends into the guide groove; the locking block and the slider are detachably connected. It also includes a second deformation mechanism, which is used to change the shape of the intake manifold front body wall. The second deformation mechanism includes a pressure relief plate with one side wall for connecting with the intake manifold front body. The pressure relief plate is made of metal material. One end of the pressure relief plate is fixedly connected to the intake manifold front body, and the other end is suspended. The bottom of the pressure relief plate is also fixedly connected to a traction rope. The traction rope is used to drive the pressure relief plate to undergo elastic deformation, thereby forming a gap for fluid to leave the air intake. The end of the traction rope away from the pressure relief plate is also connected to a sliding bar. A second driving member is fixedly connected to one side of the sliding bar, and a second reset member is fixedly connected to the other side of the sliding bar. The second driving component includes a second driving bar made of SMA wire. The length direction of the second driving bar is the same as the length direction of the second reset component. The second reset component is used to drive the sliding bar to move to the initial position. The second deformation mechanism further includes a limiting block, which has a limiting groove for the traction rope to pass through; wherein, the limiting block is used to be fixedly connected to the front of the air intake; the opening direction of the limiting groove is parallel to the length direction of the second drive bar; The second deformation mechanism further includes a pulley, which has a groove along its circumference and is rotatably connected to the limiting groove. The groove is opened in a direction parallel to the opening direction of the limiting groove.

2. The intake duct profile adjustment device according to claim 1, characterized in that, The first deformation mechanism further includes: At least one reciprocating bearing, the outer ring of which is fixedly connected to the guide hole, wherein the reciprocating bearing is arranged in a direction parallel to the opening direction of the guide hole; The guide rod is fixedly connected to the inner ring of the reciprocating bearing, and the guide rod slides along the opening direction of the guide hole through the reciprocating bearing.

3. The intake duct profile adjustment device according to claim 1, characterized in that, The slider has a connecting groove on the side near the first reset member. One end of the first reset member extends into the connecting groove and is fixedly connected to the slider by bolts.

4. The intake duct profile adjustment device according to claim 1, characterized in that, Multiple second drive bars and multiple second reset members are provided, and each second drive bar is aligned with the axis of one of the second reset members.

5. A variable air intake, characterized in that, An intake duct profile adjustment device as described in any one of claims 1-4 is used.

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