Airflow generating device capable of being used for experimental research

Abstract

The invention relates to an airflow generating device for experimental research, which belongs to gas generating devices and comprises a barrel, a through hole is formed in one end of the barrel, a telescopic film is fixed on the barrel, an insertion hole is formed in the middle of the telescopic film, an adjusting pipe is arranged at the insertion hole in a penetrating manner, and the adjusting pipe is formed by curling an elastic thin plate; the limiting assembly comprises a sleeve frame which is in a circular ring shape and arranged on the barrel in a sleeving mode, and the axis of the sleeve frame coincides with the axis of the barrel; the plurality of connecting plates are positioned between the sleeve frame and the cylinder body and are used for fixing the sleeve frame and the cylinder body; the connecting rod assemblies are arranged on the corresponding connecting plates; the connecting rod assembly comprises a through groove which is formed in the connecting plate and penetrates through the connecting plate in the X direction; the limiting rod is arranged in the through groove in a penetrating manner, and the limiting rod is rotationally connected to the connecting plate through a shaft; the end B of the limiting rod abuts against the outer wall of the adjusting pipe, and the limiting rod can limit expansion of the adjusting pipe through rotation. And a generating device is arranged on the cylinder body. The device can change the volume of the cylinder body and adjust the caliber of the pipe, and provides more vortex ring experiment data.

Description

Technical Field

[0001] The invention belongs to a gas generating device, and in particular relates to an airflow generating device which can be used for experimental research. Background Art

[0002] The vortex ring generating device in the laboratory mainly creates disturbance in the air and ejects it quickly by rapidly compressing the air, creating a phenomenon similar to an air cannon.

[0003] The current vortex ring generating device can only change the speed of air compression, but cannot change the diameter of the air nozzle or the volume of the air storage chamber. Therefore, the number of control tests that can be carried out is limited and the amount of data obtained is small. Summary of the invention

[0004] The airflow generating device of the present invention can be used for experimental research, and can change the caliber of the air nozzle and the volume of the air storage cavity.

[0005] The present invention provides an airflow generating device that can be used for experimental research, comprising a cylinder, a cavity is provided inside the cylinder, the axis of the cylinder is arranged along the X direction, a through hole is provided at one end of the cylinder along the X direction, a telescopic film is fixed on the cylinder, the outer wall of the telescopic film is bonded to the inner wall of the cylinder, a plug hole is provided in the middle of the telescopic film, and the axis of the plug hole coincides with the axis of the cylinder; An adjusting tube is provided at the insertion hole. The adjusting tube is formed by curling an elastic thin plate. When viewed in the X direction, the adjusting tube is tubular. The adjusting tube can expand outwards by its own elastic force, and the telescopic membrane can deform adaptively with the expansion of the adjusting tube. Also included is a limiting assembly for limiting outward expansion of the regulating tube, the limiting assembly comprising: The sleeve frame is in a circular shape and is sleeved on the cylinder body, and the axis of the sleeve frame coincides with the axis of the cylinder body; A plurality of connecting plates are disposed between the sleeve frame and the cylinder body and are used to fix the sleeve frame and the cylinder body, and all the connecting plates are arranged in a circular array along the axis of the sleeve frame; A plurality of connecting rod assemblies are arranged on corresponding connecting plates; the connecting rod assemblies include: A through groove is provided on the connecting plate and penetrates the connecting plate along the X direction; The limiting rod is inserted into the through slot, and is connected to the connecting plate by means of an axis rotation, and the plane where the axis of the limiting rod is located is parallel to the end surface of the cylinder; the B end of the limiting rod abuts against the outer wall of the regulating tube, and the limiting rod can limit the expansion of the regulating tube by rotation; The cylinder is provided with a generating device for generating a vortex ring at the end of the regulating tube.

[0006] Furthermore, the sleeve frame is rotatably connected to a rotating frame, the rotating frame is in a circular ring shape, and the axis of the rotating frame coincides with the axis of the sleeve frame; A mounting frame is fixed on the outer wall of the cylinder; a driving motor is arranged on the mounting frame, a non-rotating shaft end of the driving motor is fixed on the mounting frame, and the axis of the rotating shaft of the driving motor is along the X direction; a driving gear is fixed on the rotating shaft of the driving motor, and the axis of the driving gear coincides with the axis of the rotating shaft of the driving motor; a rotating rack is fixedly connected to the rotating frame, and the rotating rack is in an arc shape, and when viewed in the X direction, its center coincides with the center of the frame, and the driving gear meshes with the rotating rack; A first connecting rod is provided on the rotating frame, one end of the first connecting rod is rotatably connected to the rotating frame, the axis of the hinge shaft of this end of the first connecting rod is along the X direction, and the other end is not connected to the sleeve frame and the rotating frame; A second connecting rod is rotatably connected to the sleeve. When viewed in the X direction, the second connecting rod is L-shaped. One end of the first connecting rod is rotatably connected to the sleeve, and the other end can abut against the A end of the limiting rod. The middle part of the second connecting rod is rotatably connected to the other end of the first connecting rod, and the axis of the hinge shaft at the other end of the first connecting rod is along the X direction.

[0007] The driving motor drives the rotating rack and the rotating frame as a whole through electric drive, and the rotating frame and the sleeve frame rotate the limiting rod through the first connecting rod and the second connecting rod. The B end of the limiting rod can reduce the diameter of the regulating tube by tightening the regulating tube toward the center of the cylinder, and vice versa. Electric control, simple operation.

[0008] Furthermore, the cylinder body is composed of a cylinder member 1 and a cylinder member 2. The cylinder member 1 and the cylinder member 2 are similar in shape and both include a cylindrical cylinder seat. A plurality of cylinder blocks are fixed on the end surface of one side of the cylinder seat without a bottom surface. The cylinder blocks are arranged in a circular array along the axis of the cylinder seat, and a slot is formed between two adjacent cylinder blocks. When the cylinder member 1 and the cylinder member 2 form the cylinder body, the cylinder block of the cylinder member 1 is in the slot of the cylinder member 2, and the cylinder block of the cylinder member 2 is in the slot of the cylinder member 1. Each slot is bonded with an elastic film for sealing the slot; a through hole is provided on the first cylinder, the sleeve is fixed on the first cylinder through a connecting plate, and the generating device is provided on the second cylinder; A hydraulic telescopic rod is arranged on the outer wall of the first cylinder, the non-telescopic end of the hydraulic telescopic rod is fixed on the outer wall of the first cylinder, the telescopic end of the hydraulic telescopic rod is fixed on the outer wall of the second cylinder, and the axis of the hydraulic telescopic rod is along the X direction.

[0009] The volume of the cylinder can be changed, and after the volume is changed, the elastic membrane is used to maintain the sealing of the slot. Relevant experiments can be done to see whether the change in the cylinder volume has an impact on the vortex ring, and more experimental data are available.

[0010] Furthermore, the generating device comprises: A generating motor, the non-rotating shaft end of which is fixed on the outer bottom surface of the cylinder seat of the second cylinder, and the rotating shaft axis of the generating motor is along the radial direction of the second cylinder; A driving gear is fixed on the rotating shaft of the generating motor, and the axis of the driving gear coincides with the rotating shaft of the generating motor; The generating rack is arranged on the bottom surface of the cylinder seat of the cylinder member 2. A hole for the generating rack to pass through is opened on the bottom surface of the cylinder seat of the cylinder member 2. The generating rack can move along the X direction. The generating rack 23 is meshed with the driving gear. One end of the generating rack extends into the interior of the cylinder body. The push plate is fixed to one end of the generating rack inside the cylinder, and the peripheral wall of the push plate is in contact with the inner wall of the cylinder.

[0011] By electric means, the air is automatically compressed and a vortex ring is generated by utilizing the rapid movement of the push plate.

[0012] Furthermore, the airflow generating device further comprises a base assembly, and the base assembly comprises: A base plate, which has a cavity inside and is placed on the ground; A control motor, wherein the non-rotating shaft end is fixed in the cavity, and the rotating shaft of the control motor is arranged vertically, and the rotating shaft of the control motor extends out of the cavity; The support frame is fixed on the rotating shaft of the control motor and can rotate as a whole with the rotating shaft of the control motor; The outer shell is fixed on the supporting frame, and the outer shell is fixedly connected to the sleeve frame.

[0013] The direction of the adjusting tube can be changed by the base assembly, that is, the direction in which the vortex ring is generated from the adjusting tube is changed.

[0014] Furthermore, an anti-slip block is fixed on the inner wall of the cylinder, a spring is installed on the anti-slip block, the compression direction of the spring is along the X direction, the push plate can compress the air inside the cylinder during the stroke, and can compress the spring together with the anti-slip block.

[0015] It can play a buffering role to prevent the push plate from directly colliding with the anti-slip block and causing damage. Beneficial Effects

[0016] The cylinder of the present invention is divided into cylinder one and cylinder two, which can move relative to each other along the X direction to achieve the change of the volume of the cylinder. The device can be used to perform a comparative test on the influence of volume change on the vortex ring.

[0017] The regulating tube of the present invention can be deformed by its own elasticity, thereby expanding the insertion hole to change the outlet diameter of the vortex ring. The device can be used to perform a control test on the influence of the outlet diameter change on the vortex ring. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Fig. 1 is a schematic structural diagram of the gas cylinder assembly of the present device; Figure 2 It is a schematic diagram of the connection structure of the sleeve frame and the rotating frame; Figure 3It is a schematic diagram of the connection structure between the cylinder member 1 and the connection plate; Figure 4 is a schematic diagram of the structure of the limiting rod; Figure 5 It is a schematic diagram of the connection structure between the push plate and the generating rack; Figure 6 It is a schematic diagram of the overall structure of the device.

[0019] 1. Cylinder assembly; 11. Cylinder piece 1; 12. Cylinder piece 2; 13. Slot; 14. Telescopic membrane; 15. Adjusting tube; 16. Sleeve; 17. Connecting plate; 18. Rotating frame; 19. First connecting rod; 110. Second connecting rod; 111. Through slot; 112. Limiting rod; 113. Mounting frame; 114. Driving motor; 115. Active gear; 116. Rotating rack; 117. Hydraulic telescopic rod; 118. Through hole; 2. Generating device; 21. Generating motor; 22. Driving gear; 23. Generating rack; 24. Push plate; 25. Anti-slip block; 3. Base assembly; 31. Base plate; 32. Control motor; 33. Support frame; 34. Housing. DETAILED DESCRIPTION

[0020] In order to make the purpose, technical solution and advantages of the embodiments of the present invention clearer, the technical solution of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Obviously, the described embodiments are 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.

[0021] See Figure 1 , an airflow generating device that can be used for experimental research, including an air cylinder assembly 1, and the air cylinder assembly 1 includes: The cylinder body, in this embodiment, is cylindrical in shape, and a cavity is provided inside the cylinder body. The cylinder body is composed of a cylinder part 11 and a cylinder part 2 12. The axis of the cylinder body is along Figure 1 In the X direction, the cylinder member 11 and the cylinder member 2 12 can slide relative to each other along the X direction. Figure 3 The structures of the cylinder member 11 and the cylinder member 2 12 are similar, both of which include: a cylinder seat in the shape of a cylinder; a plurality of cylinder blocks are integrally arranged on the end surface of the cylinder seat without a bottom surface, and each cylinder block is arranged in an array along the axis of the cylinder seat, and a clamping groove 13 is formed between two adjacent cylinder blocks. When the cylinder member 11 and the cylinder member 2 12 form a cylinder body, the cylinder block of the cylinder member 11 is in the clamping groove 13 of the cylinder member 2 12, and the cylinder block of the cylinder member 2 12 is in the clamping groove 13 of the cylinder member 1.

[0022] A plurality of elastic membranes (not shown), which are the same as the total number of the slots 13 of the cylinder piece 11 and the cylinder piece 2 12, are fixed in the slots 13 of the corresponding cylinder piece 11 or the cylinder piece 2 12, and the elastic membranes are fixedly connected to the surfaces of the slots 13, and are also fixedly connected to the end faces of the corresponding cylinder blocks, and are used to seal the gap between the cylinder piece 11 and the cylinder piece 2 12, that is, to ensure that when the cylinder piece 11 and the cylinder piece 2 12 move relative to each other, the slots 13 of the two remain sealed.

[0023] Through hole 118, see Figure 3 , is opened on the cylinder seat of the cylinder member 11, and the through hole 118 penetrates the cylinder seat of the cylinder member 11 along the X direction. In this embodiment, the diameter of the through hole 118 is equal to the inner diameter of the cylinder seat, and the axis of the through hole 118 coincides with the axis of the cylinder seat of the cylinder member 11.

[0024] The telescopic membrane 14 is fixed on the inner wall of the cylinder 11 and is located at the position of the through hole 118. In this embodiment, the telescopic membrane 14 is made of a thin rubber membrane, which can be elastically deformed when subjected to force. The shape of the telescopic membrane 14 is annular, and the middle part of the telescopic membrane 14 is a plug hole. The axis of the telescopic membrane 14 coincides with the axis of the cylinder seat, and the outer wall of the telescopic membrane 14 is bonded and fixed to the inner wall of the cylinder seat to maintain a seal.

[0025] The adjusting tube 15 can adjust its caliber. In this embodiment, the adjusting tube 15 is made of a rectangular elastic metal sheet and rolled into a shape similar to a "steel coil". When viewed along the X direction, the adjusting tube 15 is similar to a tubular structure. It is assumed that the axis of the adjusting tube 15 coincides with the axis of the cylinder seat. The adjusting tube 15 is inserted into the insertion hole of the telescopic membrane 14, and the outer wall of the adjusting tube 15 contacts the inner wall of the insertion hole of the telescopic membrane 14. Since the elastic metal sheet has elasticity after being rolled into a roll, the adjusting tube 15 will expand outward, thereby squeezing the insertion hole wall of the telescopic membrane 14, so that the insertion hole edge of the telescopic membrane 14 is elastically deformed toward the position of the inner wall of the cylinder seat, so that the caliber of the adjusting tube 15 becomes larger, and the inner diameter of the hole of the telescopic membrane 14 is also synchronously expanded by the adjusting tube 15. Figure 3 The jack and the adjusting tube 15 are not shown.

[0026] See Figure 1 The airflow generating device further comprises a limiting component for limiting the outer shape deformation of the regulating tube 15, and the limiting component comprises: The sleeve 16, in this embodiment, is in a circular ring shape and is sleeved on the cylinder 11. The sleeve 16 is fixedly connected to the cylinder 11, and the axis of the sleeve 16 coincides with the axis of the cylinder 11.

[0027] Multiple connecting plates 17, see Figure 3 , located between the sleeve 16 and the outer wall of the cylinder 11, the sleeve 16, the connecting plate 17 and the cylinder 11 are fixed as a whole through the connecting plate 17. A plurality of connecting plates 17 are arranged in an array along the axis of the sleeve 16.

[0028] Rotating frame 18, see Figure 1 and Figure 2 In this embodiment, the rotating frame 18 is annular, the axis of the rotating frame 18 coincides with the axis of the sleeve frame 16, the rotating frame 18 is rotatably connected to the sleeve frame 16, and the rotating frame 18 can rotate around its axis relative to the sleeve frame 16.

[0029] A plurality of connecting rod assemblies are arranged on the sleeve frame 16 and the rotating frame 18. The plurality of connecting rod assemblies are arranged in a circular array along the axis of the sleeve frame 16 and are arranged one by one corresponding to the connecting plates 17. The connecting rod assemblies include: The first connecting rod 19, see Figure 2 , one end is rotatably connected to the rotating frame 18, the axis of the hinge shaft of this end of the first connecting rod 19 is along the X direction, and the other end is not connected to either the sleeve frame 16 or the rotating frame 18; The second connecting rod 110 is L-shaped when viewed along the X direction. One end of the second connecting rod 110 is rotatably connected to the sleeve frame 16, and the axis of the hinge shaft of this end of the second connecting rod 110 is along the X direction. The middle part of the second connecting rod 110 is rotatably connected to the other end of the first connecting rod 19, and the axis of the hinge shaft of the other end of the first connecting rod 19 is along the X direction.

[0030] Through slot 111, see Figure 1 and Figure 4 , is opened on the connecting plate 17 and penetrates the connecting plate 17 along the X direction.

[0031] Limit rod 112, see Figure 3 and Figure 4 , penetrated in the through slot 111, the limiting rod 112 is connected to the inner wall of the through slot 111 by means of an axis, and the plane where the axis of the limiting rod 112 is located is parallel to the end surface of the cylinder. The end of the second connecting rod 110 away from its hinged end abuts against the A end of the limiting rod 112, and the B end of the limiting rod 112 abuts against the outer wall of the regulating tube 15.

[0032] Also included is a drive assembly for rotating the rotating frame 18, the drive assembly comprising: A mounting frame 113, fixed on the circumferential outer wall of the cylinder 11; The non-rotating shaft end of the driving motor 114 is fixed on the mounting frame 113 , and the rotating shaft axis of the driving motor 114 is along the X direction.

[0033] The driving gear 115 is fixed on the rotating shaft of the driving motor 114 and coincides with the axis of the rotating shaft of the driving motor 114 .

[0034] The rotating rack 116 is in an arc shape. When viewed along the axis of the sleeve frame 16 , the center of the rotating rack 116 coincides with the center of the sleeve frame 16 . The rotating rack 116 is fixed on the rotating frame 18 . The rotating rack 116 is meshed with the driving gear 115 .

[0035] It also includes a hydraulic telescopic rod 117 for moving the cylinder 11 and the cylinder 2 12 relative to each other along an axis parallel to the sleeve frame 16. The non-telescopic end of the hydraulic telescopic rod 117 is fixed to the circumferential side wall of the cylinder 11, and the telescopic rod of the hydraulic telescopic rod 117 is fixed to the circumferential side wall of the cylinder 2 12. The axis of the hydraulic telescopic rod 117 is along the X direction. In this embodiment, a plurality of hydraulic telescopic rods 117 are provided, and each hydraulic telescopic rod 117 is arranged in an array along the axis of the cylinder 1 11. The main switch of all hydraulic telescopic rods 117 is manually controlled to be turned on.

[0036] See Figure 1 , and also includes a generating device 2 for quickly compressing the air inside the cylinder to generate a vortex ring at the outlet of the regulating pipe 15. The generating device 2 includes: The non-rotating shaft end of the generating motor 21 is fixed to the outer surface of the cylinder seat of the cylinder member 12 ; the rotating shaft axis of the generating motor 21 is along the radial direction of the cylinder member 12 .

[0037] The driving gear 22 is fixed on the rotating shaft of the generating motor 21 , and its axis coincides with the rotating shaft of the generating motor 21 .

[0038] Occurrence rack 23, see Figure 5 , is penetrated on the bottom surface of the cylinder seat of the cylinder member 12, and a hole is opened on the bottom surface of the cylinder member 12 for the generation rack 23 to pass through, and the generation rack 23 can move along the X direction. One end of the generation rack 23 extends into the interior of the cylinder body, and the generation rack 23 is meshed with the driving gear 22.

[0039] The push plate 24 is fixed at one end of the generating rack 23 inside the cylinder, and is inside the cylinder. The peripheral wall of the push plate 24 fits with the inner wall of the cylinder and is sealed with a rubber ring. When the push plate 24 and the generating rack 23 move along the X direction as a whole, the gas in the cylinder is squeezed from right to left by the push plate 24, and the gas in the cylinder is quickly squeezed out of the regulating tube 15, forming a vortex ring at the left end of the regulating tube 15.

[0040] Anti-drop block 25, see Figure 3 , fixed on the inner wall of the cylinder 11, Figure 1 From a viewing angle, when the push plate 24 slides to the left to the maximum stroke along the X direction, the push plate 24 abuts against the anti-slip block 25. Restricted by the anti-slip block 25, the push plate 24 cannot completely slide out from the inside of the cylinder. A spring (not shown) is installed on the anti-slip block 25, and the compression direction of the spring is along the X direction. The spring is between the anti-slip block 25 and the push plate 24. Before the push plate 24 slides to the maximum stroke, the push plate 24 and the anti-slip block 25 will compress the spring together, and the spring will buffer the collision between the push plate 24 and the anti-slip block 25 to avoid damage to the push plate 24.

[0041] See Figure 6, and also includes a base assembly 3 for causing the vortex ring to change direction, the base assembly 3 includes: The base plate 31 has a cavity inside and is used for being placed on the ground.

[0042] The non-rotating shaft end of the control motor 32 is fixed in the cavity, and the rotating shaft of the control motor 32 is arranged vertically and extends out of the cavity.

[0043] The support frame 33 is fixed on the rotating shaft of the control motor 32 , and can rotate around the rotating shaft axis of the control motor 32 as a whole with the rotating shaft of the control motor 32 .

[0044] The outer shell 34 is sleeved on the sleeve frame 16 and is cylindrical, with an end face being a circular ring. The inner wall of the outer shell 34 is fixedly connected to the outer wall of the sleeve frame 16. The outer shell 34 is fixedly connected to the support frame 33.

[0045] The use process of this device is: (1) Methods for adjusting the volume of the cylinder cavity: The operator only needs to manually turn on the main switch of the hydraulic telescopic rod 117. Because the cylinder 11, the connecting plate 17, the sleeve 16, the shell 34, the support frame 33 and the base 31 are placed on the ground as a whole, and the position of the whole will not move, the telescopic rod of the hydraulic telescopic rod 117 will push the cylinder 2 12 away from the cylinder 11 along the X direction, and the elastic film between the cylinder 11 and the cylinder 2 12 will also stretch adaptively, which will cause the internal volume of the cylinder composed of the cylinder 11 and the cylinder 2 12 to increase. After the hydraulic telescopic rod 117 stops and is locked, it can maintain the cylinder with an increased volume. The cylinder with an increased volume can push more gas and change the test conditions when the push plate 24 moves.

[0046] (2) Methods for changing the diameter of the regulating tube: The operator turns on the driving motor 114, which rotates the driving gear 115. Since the driving gear 115 is meshed with the rotating rack 116, the driving gear 115 causes the rotating rack 116 and the rotating frame 18 to rotate relative to the sleeve frame 16 around the axis of the sleeve frame 16 as a whole.

[0047] Assuming that the diameter of the regulating tube 15 needs to be enlarged, then Figure 2 From the perspective of perspective, the rotating rack 116 and the rotating frame 18 rotate clockwise as a whole. After the rotating frame 18 rotates, it is linked in sequence through the first connecting rod 19 and the second connecting rod 110. The second connecting rod 110 moves away from one end of the second connecting rod 110 and moves toward the center of the sleeve 16. This end of the second connecting rod 110 presses the A end of the limiting rod 112, forcing the A end of the limiting rod 112 to move closer to the center of the sleeve 16. The limiting rod 112 rotates, and the B end of the limiting rod 112 produces the opposite action, that is, the B end of the limiting rod 112 moves away from the center of the sleeve 16.

[0048] When the B end of the limiting rod 112 is not far away from the center of the sleeve frame 16, because the B end of the limiting rod 112 abuts against the outer wall of the adjusting tube 15, it plays the purpose of limiting the expansion of the adjusting tube 15 to the outer shape. Therefore, when the B end of the limiting rod 112 is far away from the center of the sleeve frame 16, a certain space will be left between the outer wall of the adjusting tube 15 and the B end of the limiting rod. The adjusting tube 15 will be elastically deformed due to its own restoring force. Figure 1 The adjusting tube 15 expands outward from the perspective to achieve the purpose of increasing the diameter. When the diameter of the adjusting tube 15 is enlarged, the telescopic membrane 14 is forced to approach the inner wall of the cylinder 11, and the insertion hole of the telescopic membrane 14 is enlarged to adapt to the deformation of the adjusting tube 15. The diameter of the adjusting tube 15 can be adjusted by controlling the clockwise rotation angle of the rotating frame 18 by the driving motor 114. Within the adjustment range, the larger the clockwise rotation angle, the larger the diameter of the adjusting tube 15.

[0049] (3) Methods of generating vortex rings: by Figure 1 As an initial state, the operator manually turns on the generating motor 21, and the generating motor 21 rotates the driving gear 22. Since the driving gear 22 is meshed with the generating rack 23, the generating rack 23 and the push plate 24 move to the left as a whole.

[0050] The push plate 24 squeezes the air in the cylinder rapidly to the left, and finally the air in the cylinder is discharged from the regulating tube 15. Due to the rapid squeezing, the gas in the cylinder is disturbed, and a vortex ring is formed when the air in the cylinder is discharged from the regulating tube 15.

[0051] (4) Methods for adjusting the vortex ring angle: The control motor 32 is manually turned on, and the control motor 32 causes the support frame 33, the housing 34 and the mechanism inside the housing 34 to rotate as a whole around the axis of the rotation shaft of the control motor 32, thereby achieving a change in the angle of the vortex ring.

[0052] Based on the above ideal embodiments of the present invention, the relevant staff can make various changes and modifications without departing from the technical concept of the present invention through the above description. The technical scope of the present invention is not limited to the contents of the specification, and its technical scope must be determined according to the scope of the claims.

Claims

1. An airflow generating device that can be used for experimental research, characterized in that: The invention comprises a cylinder, a cavity is provided inside the cylinder, the axis of the cylinder is arranged along the X direction, a through hole (118) is provided at one end of the cylinder along the X direction, a telescopic film (14) is fixed on the cylinder, the outer wall of the telescopic film (14) is bonded to the inner wall of the cylinder, a plug hole is provided in the middle of the telescopic film (14), and the axis of the plug hole coincides with the axis of the cylinder; An adjusting tube (15) is inserted through the insertion hole. The adjusting tube (15) is formed by curling an elastic thin plate. When viewed in the X direction, the adjusting tube (15) is tubular. The adjusting tube (15) can expand outwards by its own elastic force, and the telescopic membrane (14) can deform adaptively with the expansion of the adjusting tube (15). It also includes a limiting component for limiting the outward expansion of the regulating tube (15), the limiting component including: The sleeve frame (16) is annular and sleeved on the cylinder, and the axis of the sleeve frame (16) coincides with the axis of the cylinder; A plurality of connecting plates (17) are disposed between the sleeve (16) and the cylinder and are used to fix the sleeve (16) and the cylinder. All the connecting plates (17) are arranged in a circular array along the axis of the sleeve (16); A plurality of connecting rod assemblies are arranged on corresponding connecting plates (17); the connecting rod assemblies include: A through groove (111) is formed on the connecting plate (17) and penetrates the connecting plate (17) along the X direction; A limiting rod (112) is inserted into the through groove (111). The limiting rod (112) is connected to the connecting plate (17) by means of an axis rotation. The plane where the axis of the limiting rod (112) is located is parallel to the end surface of the cylinder. The B end of the limiting rod (112) is in contact with the outer wall of the regulating tube (15). The limiting rod (112) can limit the expansion of the regulating tube (15) by rotating. The cylinder body is provided with a generating device (2) for generating a vortex ring at the end of the regulating tube (15).

2. An airflow generating device for experimental research according to claim 1, characterized in that: The sleeve (16) is rotatably connected to a rotating frame (18), the rotating frame (18) is in a circular ring shape, and the axis of the rotating frame (18) coincides with the axis of the sleeve (16); A mounting frame (113) is fixed on the outer wall of the cylinder; a driving motor (114) is provided on the mounting frame (113); a non-rotating shaft end of the driving motor (114) is fixed on the mounting frame (113), and the axis of the rotating shaft of the driving motor (114) is along the X direction; a driving gear (115) is fixed on the rotating shaft of the driving motor (114), and the axis of the driving gear (115) coincides with the axis of the rotating shaft of the driving motor (114); a rotating rack (116) is fixedly connected to the rotating frame (18), and the rotating rack (116) is in an arc shape. When viewed in the X direction, its center coincides with the center of the sleeve frame (16), and the driving gear (115) is meshed with the rotating rack (116); A first connecting rod (19) is provided on the rotating frame (18), one end of the first connecting rod (19) is rotatably connected to the rotating frame (18), the axis of the hinge shaft of this end of the first connecting rod (19) is along the X direction, and the other end is not connected to the sleeve frame (16) and the rotating frame (18); A second connecting rod (110) is rotatably connected to the sleeve (16). When viewed in the X direction, the second connecting rod (110) is L-shaped. One end of the first connecting rod (19) is rotatably connected to the sleeve (16), and the other end can abut against the A end of the limiting rod (112). The middle part of the second connecting rod (110) is rotatably connected to the other end of the first connecting rod (19), and the axis of the hinge shaft at the other end of the first connecting rod (19) is along the X direction.

3. The airflow generating device for experimental research according to claim 1, characterized in that: The cylinder body is composed of a cylinder piece 1 (11) and a cylinder piece 2 (12). The cylinder piece 1 (11) and the cylinder piece 2 (12) are similar in shape and both include a cylindrical cylinder seat. A plurality of cylinder blocks are fixed on the end surface of one side of the cylinder seat without a bottom surface. The cylinder blocks are arranged in a circular array along the axis of the cylinder seat, and a clamping groove (13) is formed between two adjacent cylinder blocks. When the cylinder piece 1 (11) and the cylinder piece 2 (12) form the cylinder body, the cylinder block of the cylinder piece 1 (11) is located in the clamping groove (13) of the cylinder piece 2 (12), and the cylinder block of the cylinder piece 2 (12) is located in the clamping groove (13) of the cylinder piece 1 (11). Each slot (13) is bonded with an elastic film for sealing the slot (13); a through hole (118) is provided on the first cylinder member (11); the sleeve (16) is fixed on the first cylinder member (11) through a connecting plate (17); and the generating device (2) is provided on the second cylinder member (12); A hydraulic telescopic rod (117) is arranged on the outer wall of the first cylinder (11), the non-telescopic end of the hydraulic telescopic rod (117) is fixed on the outer wall of the first cylinder (11), the telescopic end of the hydraulic telescopic rod (117) is fixed on the outer wall of the second cylinder (12), and the axis of the hydraulic telescopic rod (117) is along the X direction.

4. The airflow generating device for experimental research according to claim 3, characterized in that: The generating device (2) comprises: A generating motor (21), the non-rotating shaft end of which is fixed on the outer bottom surface of the cylinder seat of the second cylinder member (12), and the rotating shaft axis of the generating motor (21) is along the radial direction of the second cylinder member (12); A driving gear (22) is fixed on the rotating shaft of the generating motor (21), and the axis of the driving gear (22) coincides with the rotating shaft of the generating motor (21); A generating rack (23) is arranged on the bottom surface of the cylinder seat of the second cylinder member (12). A hole is provided on the bottom surface of the cylinder seat of the second cylinder member (12) for the generating rack (23) to pass through. The generating rack (23) can move along the X direction. The generating rack (23) is meshed with the driving gear (22). One end of the generating rack (23) extends into the interior of the cylinder body. The push plate (24) is fixed to one end of the generating rack (23) located inside the cylinder, and the peripheral wall of the push plate (24) is in contact with the inner wall of the cylinder.

5. The airflow generating device for experimental research according to claim 3, characterized in that: The airflow generating device further comprises a base assembly (3), wherein the base assembly (3) comprises: A base plate (31) having a cavity therein and placed on the ground; A control motor (32), the non-rotating shaft end of which is fixed in the cavity, the rotating shaft of the control motor (32) is arranged vertically, and the rotating shaft of the control motor (32) extends out of the cavity; The support frame (33) is fixed on the rotating shaft of the control motor (32) and can rotate as a whole with the rotating shaft of the control motor (32); The outer shell (34) is fixed on the support frame (33), and the outer shell (34) is fixedly connected to the sleeve frame (16).

6. The airflow generating device for experimental research according to claim 4, characterized in that: An anti-slip block (25) is fixed on the inner wall of the cylinder, and a spring is installed on the anti-slip block (25). The compression direction of the spring is along the X direction. The push plate (24) can compress the air inside the cylinder during the stroke, and can compress the spring together with the anti-slip block (25).

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