Direct-current low-speed wind tunnel taking laser Doppler velocimeter as standard

Abstract

The invention relates to the technical field of low-speed wind tunnels, and discloses a direct-current low-speed wind tunnel taking a laser Doppler velocimeter as a standard, and the wind tunnel comprises a pedestal, the pedestal is slidably connected with a speed measuring device, one side of the pedestal is connected with a connecting plate, the connecting plate is connected with a rear tube through a fixing hoop, one side of the pedestal is connected with a butt joint seat, and the butt joint seat is connected with an insertion column. A front pipe is slidably connected to the insertion column, one end of the front pipe is connected with a wind tunnel end, the wind tunnel end is connected with a limiting rod, the limiting rod is slidably connected with a lantern ring, a first spring is connected between the lantern ring and the wind tunnel end, and the limiting rod is sleeved with the first spring. A poke rod can drive a gear ring to rotate, so that an extrusion block uniformly clamps the outer side of a front pipe, the problem that an air pipe structure is large and cannot be well separated is effectively avoided, the front pipe structure is pushed in cooperation with a pushing frame structure, the front pipe and the rear pipe are rapidly separated after mutual rotation, and the separation efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of low-speed wind tunnels, and particularly to a direct-current low-speed wind tunnel with a laser Doppler velocimeter as a standard. Background Art

[0002] A conventional wind tunnel refers to a wind tunnel with a test-section wind speed less than 140 m / s, also called a low-speed wind tunnel. In the fields of aerospace, basic research on low-speed flows and research on the layout and performance of various aircraft are all tested in conventional wind tunnels.

[0003] Low-speed wind tunnels are mainly used for researching the performance of aircraft. During the test, the aircraft needs to be placed in the test section of the wind tunnel, and the test section is often set in the middle of the wind tunnel. To facilitate the placement of the aircraft, the wind tunnel mostly adopts a split structure. Among them, the wind tunnel structure is large and the splitting operation is inconvenient. During the test, the aircraft needs to be tested under different wind speed conditions, that is, the low-speed wind tunnel needs to be equipped with a velocimeter for the test, and the velocimeter needs to be set below the test section. Since velocimeters such as laser Doppler velocimeters are expensive, in order to avoid the problem that the existing structure drops and damages the velocimeter when the wind tunnel is split and the aircraft is disassembled and assembled, it is necessary to manually move the velocimeter when the wind tunnel is split. The preparatory matters before disassembling and assembling the aircraft will delay the test efficiency.

[0004] Based on this, a direct-current low-speed wind tunnel with a laser Doppler velocimeter as a standard is proposed. Summary of the Invention

[0005] The purpose of the present invention is to provide a direct-current low-speed wind tunnel with a laser Doppler velocimeter as a standard in order to solve the problem of inconvenient disassembly and assembly of aircraft in low-speed wind tunnels.

[0006] In order to achieve the above purpose, the present invention adopts the following technical solutions:

[0007] A direct-current low-speed wind tunnel with a laser Doppler velocimeter as a standard includes a base. A velocimeter device is slidably connected to the base. One side of the base is connected with a connecting plate. The connecting plate is connected with a rear pipe through a fixing hoop. One side of the base is connected with a docking seat. A plugging column is connected to the docking seat. A front pipe is slidably connected to the plugging column. One end of the front pipe is connected with a wind tunnel end. A limiting rod is connected to the wind tunnel end. A collar is slidably connected to the limiting rod. A first spring is connected between the collar and the wind tunnel end. The first spring is sleeved on the limiting rod. A rotating shaft is rotatably connected to the collar. An extrusion block and a gear are connected to both ends of the rotating shaft. A toothed ring is meshingly connected between the gears. The toothed ring is rotatably connected to the front pipe. A handle is connected to the outside of the toothed ring. A separating mechanism for driving the velocimeter device to move and separating the front pipe from the rear pipe is connected to the connecting plate.

[0008] Furthermore, a slide rail is provided on the base, a translation bar is fixedly connected to the lower end of the speed measuring device, and the translation bar is slidably connected to the slide rail.

[0009] Furthermore, a docking bar is connected to the docking seat, and the docking bar is connected to the slide rail through a docking frame.

[0010] Furthermore, a gasket ring is sleeved on the plug-in column.

[0011] Furthermore, an anti-slip ring is connected to the front tube, and the extrusion block can be deflected to the outside to abut against the anti-slip ring.

[0012] Furthermore, the separation mechanism includes a sliding rod, an L-shaped groove is provided on the connecting plate, a vertical bar is slidably connected to one side of the connecting plate, the sliding rod is slidably connected to the vertical bar through a lifting block, the lower end of the vertical bar is connected to a connecting frame, the connecting frame is connected to a pushing frame, one side of the connecting plate is connected to a deflection shaft, a sleeve is provided on the outer side of the sliding rod, a telescopic cylinder is connected to the outer side of the sleeve, and the telescopic cylinder is rotatably connected to the deflection shaft through a cylinder hoop.

[0013] Furthermore, the connection plate is connected to a limit bar, a middle block is slidably connected to the limit bar, and a toggle rod is connected to the outer side of the middle block.

[0014] Furthermore, the connecting plate is connected to a symmetrical bar, the symmetrical bar is slidably connected to a clamping block, and the clamping block is fixedly connected to one side of the vertical bar.

[0015] In summary, due to the adoption of the above technical solution, the beneficial effects of the present invention are:

[0016] 1. The present invention adopts a toggle rod structure, which can drive the gear ring to rotate, so that the extrusion block can evenly clamp the outside of the front tube, effectively avoiding the problem that the duct structure is large and cannot be separated well. The front tube structure is pushed in conjunction with the pushing frame structure, so that the front and rear tubes can be quickly separated after rotating relative to each other, thereby improving the separation efficiency.

[0017] 2. The present invention adopts a connecting frame structure and uses the connecting frame to push the speed measuring device to move, so that before the wind tunnel structure is separated, the speed measuring device is automatically moved away from under the experimental section to avoid accidental touching of the speed measuring device during disassembly and assembly of the aircraft, causing damage to the speed measuring device; and the non-manual movement method can also prevent the operator from touching the speed measuring device and interfering with its test accuracy, ensuring that the position coordinates of the speed measuring device remain unchanged when it is reset, ensuring that the speed measurement accuracy is not disturbed. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 It shows a schematic diagram of the overall structure of a low-speed wind tunnel provided according to an embodiment of the present invention;

[0019] Figure 2 Shows a schematic structural view of the connection part of the telescopic cylinder provided according to an embodiment of the present invention;

[0020] Figure 3 Shows an exploded structural view of the connection part of the vertical bar provided according to an embodiment of the present invention;

[0021] Figure 4 Shows an exploded structural view of the connection part of the collar provided according to an embodiment of the present invention;

[0022] Figure 5 Shows an exploded structural view of the connection part of the speed measurement device provided according to an embodiment of the present invention.

[0023] Legend description:

[0024] 1. Base; 2. Connecting plate; 3. Slide rail; 4. Fixed hoop; 5. Rear pipe; 6. Docking seat; 7. Pad ring; 8. Front pipe; 9. Speed measurement device; 10. Connection frame; 11. Pushing frame; 12. Vertical bar; 13. Wind tunnel end; 14. Collar; 15. L-shaped groove; 16. Insertion column; 17. Extrusion block; 18. Limiting rod; 19. First spring; 20. Limiting strip; 21. Intermediate block; 22. Dialing rod; 23. Telescopic cylinder; 24. Cylinder hoop; 25. Deflection shaft; 26. Sliding rod; 27. Sleeve; 28. Anti-slip ring; 29. Gear; 30. Tooth ring; 31. Handle; 32. Rotating shaft; 33. Docking strip; 34. Docking frame; 35. Translation strip; 36. Lifting block; 37. Clamping block; 38. Symmetric strip. Specific embodiments

[0025] Next, in combination with the accompanying drawings in the embodiments of the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention.

[0026] Please refer to Figures 1-5 , the present invention provides a technical solution:

[0027] A DC low-speed wind tunnel with a laser Doppler velocimeter as the standard, including a base 1. This low-speed wind tunnel consists of an intake section, a stabilization section, a contraction section, a test section, a diffusion section, a power section, a corner section, and an exhaust section. Without affecting the airflow uniformity and stability in the working section of the wind tunnel, a 90-degree elbow is added to the end of the wind tunnel. The working section includes the entire structure from the intake section to the power section. This type of low-speed wind tunnel has the characteristics of good flow field quality, high uniformity and stability indicators, a compact structure, a beautiful appearance, a small floor area, and convenient installation and movement. The wind speed control is stable, with high precision and simple operation;

[0028] A speed measurement device 9 is slidably connected to the base 1. This low-speed wind tunnel adopts a wind tunnel structure with a laser Doppler velocimeter as the standard. The connecting frame 10 is sized to fit this type of speed measurement device 9. One side of the base 1 is connected to a connecting plate 2, and the connecting plate 2 is vertically connected to the base 1. The connecting plate 2 is connected to a rear pipe 5 through a fixing hoop 4, and the rear pipe 5 is fixedly connected to the fixing hoop 4;

[0029] One side of the base 1 is connected to a docking seat 6. An insertion column 16 is connected to the docking seat 6. A front pipe 8 is slidably connected to the insertion column 16. One end of the front pipe 8 is connected to a wind tunnel end 13. The front pipe 8 is sleeved outside the insertion column 16. A limiting rod 18 is connected to the wind tunnel end 13. A collar 14 is slidably connected to the limiting rod 18. A first spring 19 is connected between the collar 14 and the wind tunnel end 13. The first spring 19 is sleeved on the limiting rod 18. The limiting rod 18 is vertically connected to the wind tunnel end 13. The two ends of the first spring 19 are respectively connected to the wind tunnel end 13 and the collar 14;

[0030] A rotating shaft 32 is rotatably connected to the collar 14. An extrusion block 17 and a gear 29 are connected to both ends of the rotating shaft 32. The structure of the extrusion block 17 is in the shape of a cam. The gear 29 rotates synchronously with the extrusion block 17. A toothed ring 30 is meshed and connected between the gears 29. A structure for limiting the toothed ring 30 is connected to the gear 29 to prevent the toothed ring 30 from separating from the collar 14. The toothed ring 30 is rotatably connected to the front pipe 8. A handle 31 is connected to the outside of the toothed ring 30. Pushing the handle 31 can drive the toothed ring 30 to rotate. A separation mechanism for driving the speed measurement device 9 to move and then separating the front pipe 8 and the rear pipe 5 is connected to the connecting plate 2.

[0031] Specifically, as Figure 5 shown, a slide rail 3 is provided on the base 1. A translation bar 35 is fixedly connected to the lower end of the speed measurement device 9. The translation bar 35 is slidably connected to the slide rail 3. By setting the translation bar 35, the stability of the horizontal movement of the speed measurement device 9 is improved, ensuring that the structural reset position of the speed measurement device 9 will not deviate.

[0032] Specifically, as Figure 5As shown, a docking bar 33 is connected to the docking seat 6, and the docking bar 33 is connected to the slide rail 3 through a docking frame 34. By setting the docking bar 33 and the docking frame 34, the connection state between the docking seat 6 and the base 1 can be flexibly changed. When the docking frame 34 is clamped on the docking bar 33, the docking seat 6 and the base 1 are inseparable. At this time, both ends of the docking frame 34 are inserted into the base 1.

[0033] Specifically, Figure 2 As shown, a gasket 7 is sleeved on the plug-in column 16. The gasket 7 reduces the impact of the collision between one end of the front tube 8 and the docking seat 6 when separated, thereby protecting the structure of the wind tunnel end 13.

[0034] Specifically, Figure 4 As shown, an anti-slip ring 28 is connected to the front tube 8, and the extrusion block 17 can be deflected to the outside and abut against the anti-slip ring 28, wherein the anti-slip ring 28 is fixedly connected to the outside of the front tube 8, and when the extrusion block 17 is deflected, it can be stably clamped on the outside of the anti-slip ring 28 to avoid slipping between the structures when separating the wind tunnel ducts.

[0035] Specifically, Figure 3 As shown, the separation mechanism includes a sliding rod 26, an L-shaped groove 15 is provided on the connecting plate 2, the sliding rod 26 is slidably connected to the L-shaped groove 15, one side of the connecting plate 2 is slidably connected to a vertical bar 12, the vertical bar 12 is vertically arranged above the base 1, the sliding rod 26 is slidably connected to the vertical bar 12 through a lifting block 36, wherein the lifting block 36 is slidably connected to the vertical bar 12, the lower end of the vertical bar 12 is connected to a connecting frame 10, the connecting frame 10 is connected to a pushing frame 11, and one side of the connecting plate 2 is connected to a deflection The shaft 25 and the sliding rod 26 are sleeved with a sleeve 27 on the outside, and the telescopic cylinder 23 is connected to the outside of the sleeve 27. During the telescopic cylinder 23's telescopic extension process, the telescopic cylinder 23 rotates around the deflection axis 25. After the telescopic cylinder 23 is started, the operation process is to first extend and then contract a certain distance. Therefore, before operating the telescopic cylinder 23, it is necessary to control the telescopic cylinder 23 to fully contract. The telescopic cylinder 23 is rotatably connected to the deflection axis 25 through the cylinder hoop 24, and the cylinder hoop 24 is fixedly connected to the outside of the telescopic cylinder 23.

[0036] Specifically, Figure 3 As shown, the connecting plate 2 is connected to the limit bar 20, and an intermediate block 21 is slidably connected to the limit bar 20. A toggle rod 22 is connected to the outer side of the intermediate block 21. A limit end is set at the lower end of the limit bar 20 to prevent the intermediate block 21 from separating from the limit bar 20 when the intermediate block 21 slides on the limit bar 20.

[0037] Specifically, Figure 3 and Figure 5As shown, a symmetric bar 38 is connected to the connecting plate 2, and a clamping block 37 is slidably connected to the symmetric bar 38. The clamping block 37 is fixedly connected to one side of the vertical bar 12. By setting the symmetric bar 38, the stability of the horizontal movement of the vertical bar 12 is improved.

[0038] In summary, for the DC low-speed wind tunnel provided in this embodiment with a laser Doppler velocimeter as the standard, when it is necessary to test the flight data of the aircraft at different wind speeds, the aircraft needs to be placed in the test section of the low-speed wind tunnel. The test section is located at the connection between the front pipe 8 and the rear pipe 5. The operator needs to control the telescopic cylinder 23 to extend. When the telescopic cylinder 23 extends, it can drive the sleeve 27 connected to the telescopic end of the telescopic cylinder 23 to push the sliding rod 26 to slide on the L-shaped groove 15.

[0039] Among them, the sliding rod 26 first moves horizontally. When the sliding rod 26 moves horizontally, it can drive the vertical bar 12 to move horizontally. Since the connecting frame 10 is connected to the lower end of the vertical bar 12, the connecting frame 10 and the vertical bar 12 move synchronously. The connecting frame 10 drives the speed measurement device 9 connected in the middle to move from below the test section of the low-speed wind tunnel, so as to move away from the position directly below, avoiding accidental contact with the speed measurement device 9 during the disassembly and assembly of the aircraft and causing damage to it. Among them, the speed measurement device 9 often uses a laser Doppler velocimeter. This type of velocimeter has the effects of good stability, high precision, and wide speed measurement range. Among them, this speed measurement method using laser speed measurement realizes non-contact measurement, avoids interfering with the flow field inside the low-speed wind tunnel, and has the characteristics of convenient use.

[0040] One side of the connecting frame 10 is connected to a pushing frame 11. The pushing frame 11 can push the collar 14 to displace towards the wind tunnel end 13. Among them, the pushing frame 11 can contact one side of the gear 29 during the pushing process. During the movement of the collar 14, the structure of the first spring 19 is compressed. When the sliding rod 26 moves horizontally to the other end of the L-shaped groove 15, at this time, the extrusion block 17 is displaced to the outside of the anti-slip ring 28, and the speed measurement device 9 moves to a position away from directly below the test section.

[0041] At this time, when the telescopic cylinder 23 continues to extend, it can drive the sliding rod 26 to rise vertically. At this time, the vertical bar 12 keeps its position unchanged, that is, the positions of the speed measuring device 9 and the sleeve 14 will not change. The lifting block 36 starts to slide on the vertical bar 12. When the sleeve 27 contacts the toggle rod 22, it can drive the toggle rod 22 to rise synchronously in height. The toggle rod 22 that has risen in height can be used to toggle the handle 31 to move, so that the gear ring 30 structure is deflected. The gear ring 30 and the gear 29 are meshed with each other, and the gear 29 can be synchronously driven to rotate. At this time, the extrusion block 17 is deflected to one side and abuts against the anti-slip ring 28. The extrusion block 17 can stably clamp the outer side of the front tube 8. This clamping structure can prevent the front tube 8 structure from being offset when the front tube 8 is rotated, so that the front tube 8 and the rear tube 5 can stably rotate relative to each other.

[0042] When the wind tunnel pipe connection is rotated to a certain angle, the buckle state of the wind tunnel pipe connection is cancelled. At this time, the telescopic cylinder 23 is extended to the maximum extent, and then the telescopic cylinder 23 begins to shrink. At this time, the extrusion block 17 cancels the clamping of the front tube 8, and the wind tunnel end 13 is acted upon by the spring 19, so that the wind tunnel end 13 moves toward the side of the plug-in column 16. The backing ring 7 is provided to protect the structure of the wind tunnel end 13, and the front tube 8 and the rear tube 5 are separated. Then the operator can disassemble and assemble the aircraft by himself. After the disassembly and assembly are completed, the telescopic cylinder 23 is controlled to continue to shrink, so that the sliding rod 26 slides to the lowest end of the vertical part of the L-shaped groove 15. At this time, the front tube 8 and the rear tube 5 are manually operated to approach each other, and the handle 31 is pulled to re-dock the front tube 8 and the rear tube 5. Then the telescopic cylinder 23 is controlled to continue to shrink until the speed measuring device 9 moves to the bottom of the test section. A fan is provided inside the plug-in column 16 to generate wind fields with different wind speeds, thereby simulating the flight scenes of the aircraft at different wind speeds.

[0043] The above description of the embodiments enables those skilled in the art to implement or use the present invention. Various modifications to these embodiments will be apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention will not be limited to the embodiments shown herein, but will conform to the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A direct current low-speed wind tunnel based on a laser Doppler velocimeter, comprising a base (1), characterized in that: A speed measuring device (9) is slidably connected to the base (1); a connecting plate (2) is connected to one side of the base (1); the connecting plate (2) is connected to a rear tube (5) via a fixing hoop (4); a docking seat (6) is connected to one side of the base (1); a plug-in column (16) is connected to the docking seat (6); a front tube (8) is slidably connected to the plug-in column (16); one end of the front tube (8) is connected to a wind tunnel end (13); a limiting rod (18) is connected to the wind tunnel end (13); a sleeve (14) is slidably connected to the limiting rod (18); the sleeve (14) is slidably connected to the wind tunnel end (13); A spring (19) is connected between the ends (13), the spring (19) is sleeved on the limit rod (18), a rotating shaft (32) is rotatably connected to the sleeve ring (14), an extrusion block (17) and a gear (29) are connected at both ends of the rotating shaft (32), a gear ring (30) is meshedly connected between the gears (29), the gear ring (30) is rotatably connected to the front tube (8), a handle (31) is connected to the outer side of the gear ring (30), and a separation mechanism is connected to the connecting plate (2) for driving the speed measuring device (9) to move so that the front tube (8) and the rear tube (5) are separated from each other.

2. The DC low-speed wind tunnel based on the laser Doppler velocimeter as claimed in claim 1, characterized in that: The base (1) is provided with a slide rail (3), the lower end of the speed measuring device (9) is fixedly connected with a translation bar (35), and the translation bar (35) is slidably connected to the slide rail (3).

3. The DC low-speed wind tunnel based on the laser Doppler velocimeter as claimed in claim 1, characterized in that: The docking seat (6) is connected to a docking strip (33), and the docking strip (33) is connected to the slide rail (3) via a docking frame (34).

4. The DC low-speed wind tunnel based on the laser Doppler velocimeter as claimed in claim 1, characterized in that: A gasket (7) is sleeved on the plug-in column (16).

5. The DC low-speed wind tunnel based on the laser Doppler velocimeter as claimed in claim 1, characterized in that: The front tube (8) is connected with an anti-slip ring (28), and the extrusion block (17) can be deflected to the outside to abut against the anti-slip ring (28).

6. The DC low-speed wind tunnel based on the laser Doppler velocimeter as claimed in claim 1, characterized in that: The separation mechanism comprises a sliding rod (26), an L-shaped groove (15) is provided on the connecting plate (2), one side of the connecting plate (2) is slidably connected to a vertical bar (12), the sliding rod (26) is slidably connected to the vertical bar (12) through a lifting block (36), the lower end of the vertical bar (12) is connected to a connecting frame (10), the connecting frame (10) is connected to a pushing frame (11), one side of the connecting plate (2) is connected to a deflection shaft (25), the outer side of the sliding rod (26) is sleeved with a sleeve (27), the outer side of the sleeve (27) is connected to a telescopic cylinder (23), and the telescopic cylinder (23) is rotatably connected to the deflection shaft (25) through a cylinder hoop (24).

7. The DC low-speed wind tunnel based on the laser Doppler velocimeter as claimed in claim 6, characterized in that: The connection plate (2) is connected to a limit strip (20), a middle block (21) is slidably connected to the limit strip (20), and a toggle rod (22) is connected to the outer side of the middle block (21).

8. The DC low-speed wind tunnel based on the laser Doppler velocimeter as claimed in claim 6, characterized in that: The connecting plate (2) is connected to a symmetrical bar (38), the symmetrical bar (38) is slidably connected to a clamping block (37), and the clamping block (37) is fixedly connected to one side of the vertical bar (12).

Images