A low-speed direct current wind tunnel simulation experiment device

Abstract

The application provides a low-speed direct-flow wind tunnel simulation experiment device and particularly relates to a wind tunnel experiment device. The low-speed direct-flow wind tunnel simulation experiment device comprises a workbench, a contraction section fixedly connected to the workbench and arranged in a tapered shape, a straightening section fixedly connected to the upstream of the contraction section, a honeycomb plate and a damping plate fixedly connected to the straightening section, a movable frame slidingly connected to the workbench, a power section fixedly connected to the movable frame, a fan fixedly connected to the end of the power section and an experiment section detachably connected between the contraction section and the power section. The low-speed direct-flow wind tunnel simulation experiment device is provided, the quick installation and disassembly of the experiment section are realized through the arrangement of the driving assembly and the locking assembly, manual alignment and bolt tightening are not required, the experiment preparation time is shortened, the positioning accuracy is ensured and the working efficiency of the wind tunnel is improved.

Description

Technical Field

[0001] This invention relates to the field of wind tunnel experimental equipment technology, specifically a low-speed DC wind tunnel simulation experimental device. Background Technology

[0002] Low-speed DC wind tunnels are common equipment in fluid mechanics experiments and are widely used in fields such as airfoil flow, wind load on buildings, and boundary layer research. These wind tunnels are usually composed of an inlet section, a rectification section, a contraction section, an experimental section, and a diffusion section connected in sequence. After the airflow is rectified by the honeycomb and damping net in the rectification section, it is accelerated through the contraction section and enters the experimental section to perform aerodynamic measurements on the model in the experimental section.

[0003] In existing low-speed DC wind tunnels, the experimental section is often connected to the contraction and diffusion sections using bolted flanges. When replacing the experimental section, a large number of bolts need to be manually disassembled and reassembled one by one, which is cumbersome and time-consuming. In addition, during repeated disassembly and reassembly, the bolt holes are prone to wear, which leads to a decrease in positioning accuracy. The elasticity of the sealing rings deteriorates after repeated pressure, which can easily cause airflow leakage, affecting the flow field quality and the repeatability of experimental data. Furthermore, different experimental contents require experimental sections of different lengths or configurations, and frequent disassembly and reassembly operations also seriously affect the working efficiency of the wind tunnel.

[0004] Therefore, it is necessary to provide a new low-speed DC wind tunnel simulation experimental device to solve the above-mentioned technical problems. Summary of the Invention

[0005] The technical problem this invention aims to solve is to overcome the cumbersome assembly and disassembly, low efficiency, and poor sealing reliability caused by the bolted flange connection of the experimental section in existing low-speed DC wind tunnels. This invention provides a low-speed DC wind tunnel simulation experimental device. The device uses a drive assembly to move the power section axially, and with the insertion and positioning of the positioning rod and positioning slot, as well as the automatic locking of the locking assembly, it achieves rapid connection and locking of the experimental section with the contraction section and the power section. This enables rapid replacement of the experimental section, improves the utilization efficiency of the wind tunnel and the convenience of experimental operation, and reduces the difficulty of operation and maintenance costs.

[0006] To solve the above-mentioned technical problems, the present invention provides a low-speed DC wind tunnel simulation experimental device, comprising a workbench and a contraction section fixedly connected to the workbench in a reduced shape. A rectifier section is fixedly connected upstream of the contraction section, and a honeycomb plate and a damping plate are fixedly connected inside the rectifier section. A movable frame is slidably connected to the workbench, and a power section is fixedly connected to the movable frame. A fan is fixedly connected to the end of the power section. An experimental section is detachably connected between the contraction section and the power section. The experimental section is inserted into the contraction section. Multiple sets of locking components are provided between the experimental section and the power section. An unlocking component is provided on the power section for unlocking the locking components. A driving component is provided on the workbench for driving the power section to move axially. When the driving component drives the power section to overlap with the experimental section, the locking components are locked.

[0007] Preferably, a fixed frame is fixedly connected to the workbench, the fixed frame is fixedly connected to the contraction section, and a plurality of positioning rods are fixedly connected to one end of the experimental section facing the contraction section. A plurality of positioning grooves adapted to the size of the positioning rods are opened at one end of the contraction section facing the experimental section.

[0008] Preferably, the bottom of the movable frame is fixedly connected to multiple guide rails, and the worktable is provided with multiple track grooves that are adapted to the size of the guide rails. The track grooves are arranged parallel to the axial direction of the power section.

[0009] Preferably, the drive assembly includes a screw rotatably connected to the worktable and a motor fixedly connected to the worktable. The output end of the motor is fixedly connected to the screw. A threaded sleeve is threaded onto the screw via a ball screw pair. A connecting block is fixedly connected to the bottom of the movable frame. The threaded sleeve is fixedly connected to the connecting block.

[0010] Preferably, observation windows are provided on both sides of the experimental section, multiple sealing rings are fixedly connected to both ends of the experimental section, and multiple sealing grooves that are adapted to the sealing rings are provided on the opposite surfaces of the contraction section and the power section.

[0011] Preferably, the locking assembly includes a first block fixedly connected to the experimental section and a second block fixedly connected to the power section. An alignment rod is fixedly connected to the second block. An alignment groove adapted to the size of the alignment rod is formed on the first block. A locking head is elastically connected to the alignment rod. The distance between the locking head and the second block is the same as the thickness of the first block. The locking head is connected to the unlocking assembly.

[0012] Preferably, the alignment rod has a clearance cavity for the movement of the locking head, the depth of the clearance cavity is greater than the height of the locking head, and the end of the locking head has a guide surface with an inclined surface.

[0013] Preferably, both sides of the locking head are fixedly connected to sliders, and the inner wall of the clearance cavity is provided with multiple sliding grooves that are adapted to the size of the sliders. The locking head and the clearance cavity are elastically connected by springs.

[0014] Preferably, the unlocking assembly includes multiple electric push rods fixedly connected to the power section. The extended ends of the multiple electric push rods are jointly fixedly connected to an unlocking frame. An unlocking head is fixedly connected to the locking head, and the unlocking head and the locking head are respectively located on both sides of the second block. The end of the unlocking head has an unlocking surface with an inclined surface, and the unlocking head and the unlocking frame are aligned in the horizontal projection direction.

[0015] Preferably, the plurality of locking components are evenly arranged circumferentially along the experimental section and the power section, so that the locking actions of the plurality of locking components are completed synchronously, and the unlocking component can unlock the locking state of the plurality of locking components at the same time.

[0016] By adopting the above technical solution, the beneficial effects achieved by the present invention are as follows: 1. The low-speed DC wind tunnel simulation experimental device proposed in this invention enables rapid installation and disassembly of the experimental section through the setting of the driving component and the locking component. It eliminates the need for manual alignment and tightening of bolts, shortens the experimental preparation time, ensures positioning accuracy, and improves the working efficiency of the wind tunnel.

[0017] 2. The elastic self-locking structure of the locking component of the low-speed DC wind tunnel simulation experimental device proposed in this invention can automatically lock when the power section and the experimental section are connected. The unlocking component can unlock all locking components simultaneously by driving the unlocking frame through an electric push rod. The operation is simple and stable.

[0018] 3. The honeycomb plate and damping plate in the rectification section of the low-speed DC wind tunnel simulation experimental device proposed in this invention can rectify the airflow, the multiple sealing rings ensure the airtightness of each connection, and the observation window facilitates the visualization and measurement of the flow field, providing convenient observation conditions for the experiment. Attached Figure Description

[0019] Figure 1 This is a schematic diagram of the structure of a low-speed DC wind tunnel simulation experimental device according to the present invention; Figure 2 This is a side view schematic diagram of a low-speed DC wind tunnel simulation experimental device according to the present invention; Figure 3This is a bottom view schematic diagram of the power section of a low-speed DC wind tunnel simulation experimental device according to the present invention; Figure 4 This is a split view of the power section and the experimental section of a low-speed DC wind tunnel simulation experimental device according to the present invention. Figure 5 for Figure 4 Enlarged view of point A in the middle; Figure 6 This is a breakdown diagram of the contraction section and the experimental section of a low-speed DC wind tunnel simulation experimental device according to the present invention. Figure 7 This is a cross-sectional schematic diagram of the alignment rod of a low-speed DC wind tunnel simulation experimental device according to the present invention.

[0020] Figure label: 1. Workbench; 11. Rectifying section; 112. Honeycomb panel; 113. Damping plate; 12. Contraction section; 122. Fixing frame; 13. Experimental section; 132. Sealing ring; 133. Sealing groove; 134. Observation window; 135. Positioning rod; 136. Positioning groove; 14. Power section; 142. Fan; 15. Movable frame; 151. Guide rail; 152. Track groove; 153. Connecting block; 2. Drive assembly; 21. Screw; 22. Motor; 23. Screw sleeve; 3. Locking assembly; 31. First block; 311. Alignment rod; 32. Second block; 321. Alignment groove; 33. Locking head; 35. Clearance cavity; 36. Slider; 37. Slide groove; 38. Spring; 4. Unlocking assembly; 41. Unlocking head; 42. Electric push rod; 43. Unlocking frame. Detailed Implementation

[0021] 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 a part of the embodiments of the present invention, and not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative effort are within the scope of protection of the present invention.

[0022] Furthermore, in this invention, descriptions involving "first," "second," etc., are for descriptive purposes only and should not be construed as indicating or implying their relative importance or implicitly specifying the number of technical features indicated. Thus, a feature defined as "first" or "second" may explicitly or implicitly include at least one of that feature. In the description of this invention, "a plurality of" means at least two, such as two, three, etc., unless otherwise explicitly specified.

[0023] In this invention, unless otherwise explicitly specified and limited, the terms "connection," "fixed," etc., should be interpreted broadly. For example, "fixed" can mean a fixed connection, a detachable connection, or an integral part; it can mean a mechanical connection or an electrical connection; it can mean a direct connection or an indirect connection through an intermediate medium; it can mean the internal communication of two components or the interaction between two components, unless otherwise explicitly limited. Those skilled in the art can understand the specific meaning of the above terms in this invention according to the specific circumstances.

[0024] Please see Figures 1 to 7 As shown in the figure, an embodiment of the present invention provides a low-speed DC wind tunnel simulation experimental device, including a workbench 1 and a converging section 12 fixedly connected to the workbench 1. A rectifier section 11 is fixedly connected upstream of the converging section 12. The inner wall surface of the converging section 12 is a tapered surface for accelerating the airflow. The rectifier section 11 is fixedly connected upstream of the converging section 12 and has a honeycomb plate 112 and a damping plate 113 installed inside it for rectifying the airflow before it enters the converging section 12 and eliminating eddies. A movable frame 15 is slidably connected to the workbench 1, and a power section 14 is fixedly connected to the movable frame 15. On the frame 15, a fan 142 is installed at the end of the power section 14. The experimental section 13 is detachably connected between the retractable section 12 and the power section 14. One end of the experimental section 13 is inserted into the retractable section 12 for positioning, and the other end is connected to the power section 14 through the locking component 3. The drive component 2 is installed on the workbench 1 and is used to drive the movable frame 15 to move axially, causing the power section 14 to move closer to or away from the experimental section 13. When the drive component 2 pushes the power section 14 to the position where it overlaps with the experimental section 13, the locking component 3 locks it, fixing the experimental section 13 and the power section 14 in place. This design enables quick installation and removal of the experimental section 13 without the need for manual alignment and bolt tightening, thus improving the efficiency of replacing the experimental section 13.

[0025] The fixed frame 122 is fixed on the workbench 1. The shrink section 12 is fixedly connected to the fixed frame 122 to ensure that the position of the shrink section 12 remains unchanged. On the end face of the experimental section 13 facing the shrink section 12, a plurality of positioning rods 135 are evenly connected in the circumferential direction. On the end face of the shrink section 12 facing the experimental section 13, a positioning groove 136 is opened corresponding to the position of each positioning rod 135. The insertion and cooperation of the positioning rods 135 and the positioning grooves 136 realizes the rapid alignment and positioning of the experimental section 13 and the shrink section 12, improving the installation efficiency and repeatability accuracy.

[0026] Specifically, two guide rails 151 are fixed along the length of the bottom of the movable frame 15. The cross-section of the guide rails 151 is L-shaped. A track groove 152 is opened at the corresponding position on the workbench 1. The length direction of the track groove 152 is parallel to the axis of the power section 14. The cooperation between the guide rails 151 and the track groove 152 provides guidance for the movable frame 15, ensuring the straightness of the movement direction of the power section 14, so that the power section 14 can be accurately aligned with the axis of the experimental section 13.

[0027] In addition, the drive assembly 2 includes a screw 21 rotatably connected to the worktable 1 and a motor 22 fixedly connected to the worktable 1. The output shaft of the motor 22 is fixedly connected to one end of the screw 21. The screw sleeve 23 is threadedly connected to the screw 21 through a ball screw pair. The balls of the ball screw pair roll in the helical raceway between the screw 21 and the screw sleeve 23, converting the rotational motion of the screw 21 into the linear motion of the screw sleeve 23. The outer wall of the screw sleeve 23 is fixedly connected to the connecting block 153. The connecting block 153 is fixedly connected to the bottom of the movable frame 15. The motor 22 can be a servo motor 22 or a stepper motor 22 to facilitate position control and speed adjustment.

[0028] Secondly, rectangular observation windows 134 are provided on the left and right side walls of the experimental section 13. Optical glass can be embedded in the windows. Multiple sealing rings 132 are installed circumferentially on the two end faces of the experimental section 13. The sealing rings 132 can be made of oil-resistant nitrile rubber or silicone rubber. Multiple annular sealing grooves 133 are provided at corresponding positions on the end face of the shrinkage section 12 facing the experimental section 13 and on the end face of the power section 14 facing the experimental section 13.

[0029] Furthermore, the locking assembly 3 includes a first block 31 fixedly connected to the experimental section 13 and a second block 32 fixedly connected to the power section 14. A horizontally extending alignment rod 311 is fixedly connected to the second block 32, and the axis of the alignment rod 311 is parallel to the wind tunnel axis. The first block 31 has an alignment groove 321 that matches the size of the alignment rod 311. A radially retractable locking head 33 is installed on the side of the alignment rod 311. The locking head 33 tends to pop outward under the action of the spring 38. The distance between the locking head 33 and the second block 32 is equal to the thickness of the first block 31. When the alignment rod 311 is fully inserted into the alignment groove 321, the locking head 33 just passes over the end face of the first block 31 and pops out under the action of the spring 38, locking the first block 31 onto the alignment rod 311. The locking head 33 is connected to the unlocking assembly 4.

[0030] Furthermore, a radial hole is provided inside the alignment rod 311 as a clearance cavity 35. The depth of the clearance cavity 35 is greater than the height of the locking head 33, so that the locking head 33 can be fully retracted into the clearance cavity 35. The outer end of the locking head 33 is machined into a bevel, which is inclined towards the insertion direction of the alignment rod 311. When the alignment rod 311 is inserted into the alignment groove 321, the end face of the first block 31 first contacts the bevel of the locking head 33. As the insertion proceeds, the bevel is squeezed by the end face of the first block 31, causing the locking head 33 to gradually retract into the clearance cavity 35. When the alignment rod 311 is fully inserted and the locking head 33 passes the end face of the first block 31, the locking head 33 pops out under the action of the spring 38 and locks the first block 31, thus achieving locking.

[0031] In addition, multiple sliders 36 are fixed on both the left and right sides of the locking head 33. Slide grooves 37 are provided at corresponding positions on the left and right inner walls of the clearance cavity 35. The length direction of the slide grooves 37 is parallel to the extension and retraction direction of the locking head 33. A spring 38 is installed between the locking head 33 and the bottom of the clearance cavity 35. One end of the spring 38 abuts against the inner end face of the locking head 33, and the other end abuts against the bottom of the clearance cavity 35. The preload of the spring 38 makes the locking head 33 tend to pop outward. The cooperation between the sliders 36 and the slide grooves 37 plays a guiding and anti-rotation role, ensuring that the locking head 33 can only move radially in the clearance cavity 35 and will not be tilted, ensuring that the locking head 33 can pop out to the predetermined position every time.

[0032] The unlocking assembly 4 includes multiple electric push rods 42 fixedly connected to the power section 14. The axis of the electric push rods 42 is parallel to the extension and retraction direction of the locking head 33. The extended ends of all the electric push rods 42 are fixedly connected to a rectangular unlocking frame 43. The unlocking frame 43 is sleeved on the periphery of the power section 14 and can move axially. Each locking head 33 is fixedly connected to an unlocking head 41. The unlocking head 41 has a bevel on the side facing the unlocking frame 43. The bevel is inclined in the direction of movement of the unlocking frame 43. When the electric push rods 42 extend, the unlocking frame 43 moves toward the unlocking head 41. The inner edge of the unlocking frame 43 contacts the bevel of the unlocking head 41, pushing the unlocking head 41 toward the relief cavity 35, thereby causing the locking head 33 to retract and release the locking state.

[0033] In this embodiment, four sets of locking components 3 are evenly distributed around the experimental section 13 and the power section 14. The included angles between the locking components 3 are equal. When the power section 14 moves toward the experimental section 13, the alignment rods 311 of each set of locking components 3 are simultaneously inserted into the corresponding alignment slots 321, and the locking heads 33 simultaneously pop out to lock, achieving synchronous locking. When the experimental section 13 needs to be disassembled, the electric push rods 42 of the unlocking component 4 extend simultaneously, driving the unlocking frame 43 to move axially. The unlocking frame 43 simultaneously contacts the inclined surfaces of all unlocking heads 41, pushing all locking heads 33 to retract synchronously, achieving synchronous unlocking.

[0034] Working principle: When using this device, first select the appropriate length of experimental section 13 according to the experimental requirements. During installation, insert the positioning rod 135 at one end of experimental section 13 into the positioning groove 136 on the end face of the shrinking section 12 to achieve the insertion and positioning of experimental section 13 and shrinking section 12. Then start the drive assembly 2. The motor 22 drives the screw 21 to rotate, which drives the screw sleeve 23 and connecting block 153 to move through the ball screw pair, so that the movable frame 15 slides along the guide rail 151 towards the experimental section 13. The power section 14 on the movable frame 15 then approaches the experimental section 13. When the power section 14 moves to the position of overlapping with the experimental section 13, the alignment rod 311 on the power section 14 is inserted into the alignment groove 321 on the experimental section 13. The locking head 33 on the alignment rod 311 automatically pops out under the action of the spring 38, locking and fixing the experimental section 13 and the power section 14. At the same time, the sealing rings 132 at both ends of the experimental section 13 are pressed into the sealing grooves 133 of the shrinking section 12 and the power section 14 to form an airtight seal.

[0035] When it is necessary to disassemble the experimental section 13, the electric push rod 42 of the unlocking component 4 is activated to push the unlocking frame 43 to move. The unlocking frame 43 pushes all the locking heads 33 to retract synchronously through the inclined surface on the unlocking head 41, thus releasing the locking state. Then the screw 21 rotates in the opposite direction, driving the power section 14 to move backward, so that the experimental section 13 can be removed. During the experiment, the airflow is rectified by the honeycomb plate 112 and damping plate 113 in the rectifier section 11 and then enters the contraction section 12 for acceleration. It then enters the experimental section 13 to perform aerodynamic measurements on the model and finally exits through the power section 14 and is discharged by the fan 142.

[0036] The above are merely preferred embodiments of the present invention and do not limit the patent scope of the present invention. Any equivalent structural transformations made under the concept of the present invention using the description and drawings of the present invention, or direct / indirect applications in other related technical fields, are included within the patent protection scope of the present invention.

Claims

1. A low-speed DC wind tunnel simulation experimental device, characterized in that: It includes a workbench (1) and a converging section (12) fixedly connected to the workbench (1). A rectifier section (11) is fixedly connected upstream of the converging section (12). A honeycomb panel (112) and a damping plate (113) are fixedly connected inside the rectifier section (11). A movable frame (15) is slidably connected to the workbench (1), a power section (14) is fixedly connected to the movable frame (15), a fan (142) is fixedly connected to the end of the power section (14), an experimental section (13) is detachably connected between the retractable section (12) and the power section (14), the experimental section (13) is inserted into the retractable section (12), and multiple sets of locking components (3) are provided between the experimental section (13) and the power section (14).

2. The low-speed DC wind tunnel simulation experimental device according to claim 1, characterized in that: A fixed frame (122) is fixedly connected to the workbench (1). The fixed frame (122) is fixedly connected to the contraction section (12). A plurality of positioning rods (135) are fixedly connected to one end of the experimental section (13) facing the contraction section (12). A plurality of positioning grooves (136) adapted to the size of the positioning rods (135) are opened at one end of the contraction section (12) facing the experimental section (13).

3. The low-speed DC wind tunnel simulation experimental device according to claim 1, characterized in that: The bottom of the movable frame (15) is fixedly connected with multiple guide rails (151), and the workbench (1) is provided with multiple track grooves (152) that are adapted to the size of the guide rails (151). The track grooves (152) are arranged parallel to the axial direction of the power section (14).

4. The low-speed DC wind tunnel simulation experimental device according to claim 1, characterized in that: The power section (14) is provided with an unlocking component (4), and the workbench (1) is provided with a driving component (2) for driving the power section (14) to move axially. When the driving component (2) drives the power section (14) to overlap with the experimental section (13), the locking component (3) just completes the locking.

5. The low-speed DC wind tunnel simulation experimental device according to claim 4, characterized in that: The locking assembly (3) includes a first block (31) fixedly connected to the experimental section (13) and a second block (32) fixedly connected to the power section (14). An alignment rod (311) is fixedly connected to the second block (32). An alignment groove (321) adapted to the size of the alignment rod (311) is provided on the first block (31). A locking head (33) is elastically connected to the alignment rod (311). The distance between the locking head (33) and the second block (32) is the same as the thickness of the first block (31). The locking head (33) is connected to the unlocking assembly (4).

6. The low-speed DC wind tunnel simulation experimental device according to claim 4, characterized in that: Multiple locking components (3) are evenly arranged circumferentially along the experimental section (13) and the power section (14), so that the locking action of multiple locking components (3) is completed synchronously, and the unlocking component (4) can unlock the locking state of multiple locking components (3) at the same time.

7. The low-speed DC wind tunnel simulation experimental device according to claim 1, characterized in that: The experimental section (13) has observation windows (134) on both sides, and multiple sealing rings (132) are fixedly connected to both ends of the experimental section (13). Multiple sealing grooves (133) that are adapted to the sealing rings (132) are opened on the opposite surfaces of the contraction section (12) and the power section (14).

8. The low-speed DC wind tunnel simulation experimental device according to claim 5, characterized in that: The alignment rod (311) has a clearance cavity (35) for the movement of the locking head (33). The depth of the clearance cavity (35) is greater than the height of the locking head (33). The end of the locking head (33) has a guide surface that is inclined.

9. The low-speed DC wind tunnel simulation experimental device according to claim 8, characterized in that: Both sides of the locking head (33) are fixedly connected to sliders (36), and the inner wall of the clearance cavity (35) is provided with multiple grooves (37) that are adapted to the size of the sliders (36). The locking head (33) and the clearance cavity (35) are elastically connected by springs (38).

10. The low-speed DC wind tunnel simulation experimental device according to claim 8, characterized in that: The unlocking component (4) includes multiple electric push rods (42) fixedly connected to the power section (14). The extended ends of the multiple electric push rods (42) are fixedly connected to an unlocking frame (43). An unlocking head (41) is fixedly connected to the locking head (33). The unlocking head (41) and the locking head (33) are located on opposite sides of the second block (32). The end of the unlocking head (41) is provided with an unlocking surface that is set at an angle. The unlocking head (41) and the unlocking frame (43) are arranged to overlap in the horizontal projection direction.

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