Large-span parallel-blade air distribution device

Abstract

A large-span parallel blade type air adjusting device belongs to the technical field of wind tunnel test, and aims at solving the problems of limited blade span and small angle adjusting range of the existing air adjusting device. The device comprises a blade support frame, left and right air adjusting assemblies. The blade support frame is composed of multiple vertical columns and cross beams, and multiple groups of blade installation positions are divided. The air adjusting assembly comprises multiple layers of air adjusting units, and is internally provided with a driving mechanism, multiple groups of blade assemblies and adjustable connecting rods. The front edge of the blade assembly is hingedly supported, the driving mechanism can drive each blade assembly to swing synchronously, and the blade assembly is composed of multiple blade bodies connected in series. The blade of the device can reach 22 m in length, can swing at a uniform speed in the range of -30° to +30°, can realize full cross-section airflow adjustment and control, can solve the problems of limited span and angle range of the traditional device, can meet the wind resistance and flight control verification wind tunnel test requirements of large low-altitude aircraft, and has the advantages of high rigidity, easy processing and precise transmission.

Description

Technical Field

[0001] This invention belongs to the field of wind tunnel testing technology, and in particular relates to a large-span parallel blade wind generator. Background Technology

[0002] In recent years, the low-altitude aircraft industry has developed rapidly, and the aviation sector has paid increasing attention to the operational safety of large low-altitude aircraft in near-ground atmospheric wind environments. Large low-altitude aircraft inevitably encounter complex meteorological environments during actual flight, and their safe operation under adverse weather conditions must be verified through controllable, repeatable, and measurable testing methods. This is an important prerequisite for the development of the low-altitude economy.

[0003] Existing wind control devices of this type suffer from limited span of oscillating blades and a small angle adjustment range, making it difficult to meet the requirements of wind field simulation tests for large low-altitude aircraft. To fill the gap in domestic testing equipment for the wind resistance performance of large low-altitude aircraft and to provide scientific experimental basis for the design optimization, performance evaluation, airworthiness certification, and safe operation of such aircraft, it is urgent to develop a large-span oscillating blade wind generator capable of simulating multiple wind directions. Summary of the Invention

[0004] The purpose of this invention is to provide a large-span parallel blade wind-regulating generator, solving the problems of limited blade span and small angle adjustment range in existing wind-regulating devices. This allows for efficient large-angle oscillation of large-span blades, effectively simulating multi-directional flow fields and enabling the simulation of complex wind environment processes for aircraft. The technical solution adopted in this invention is as follows:

[0005] A large-span parallel blade-type wind-regulating generator is installed inside the flow channel at the front end of the wind tunnel test section, including a blade support frame, a left wind-regulating assembly, and a right wind-regulating assembly.

[0006] The outer frame of the flow channel is a U-shaped frame. The blade support frame is a grid-type support frame composed of an odd number of evenly arranged columns and several evenly arranged crossbeams. The blade support frame is installed on the inner circumference of the outer frame of the flow channel. The column in the middle is used as the main vertical column. The column between the main vertical column and the left side frame of the outer frame of the flow channel is used as the left secondary vertical column. The column between the main vertical column and the right side frame of the outer frame of the flow channel is used as the right secondary vertical column. A left air adjustment component is provided between the main vertical column and the left side frame. A right air adjustment component is provided between the main vertical column and the right side frame. The left air adjustment component and the right air adjustment component have the same structure and are symmetrical from left to right.

[0007] The left air regulating assembly includes several vertically spaced air regulating units. Each air regulating unit includes a drive mechanism, several blade assemblies, and several connecting rods. The blade assemblies are horizontally arranged, and the several blade assemblies are vertically spaced. The leading edge of each blade assembly is hinged to the left frame, several left auxiliary vertical columns, and the main vertical column, respectively. The several blade assemblies are sequentially hinged through several connecting rods. The drive mechanism is connected to the left frame, and the output end of the drive mechanism drives the trailing edge of any blade assembly to swing up and down.

[0008] Furthermore, the blade assembly includes several blade bodies arranged at intervals along the spanwise direction. Each blade body includes a hollow frame, the outer surface of which is covered with a skin. Two thin-walled circular tubes are inserted into the blade body along the spanwise direction. The two thin-walled circular tubes are arranged at intervals along the chord direction of the corresponding blade body. The thin-walled circular tube near the leading edge of the blade body is used as the driven shaft, and the thin-walled circular tube near the trailing edge of the blade body is used as the driving shaft. Several driving shafts in each blade assembly are coaxially connected in sequence through a first rotating shaft, and several driven shafts in each blade assembly are coaxially connected in sequence through a second rotating shaft.

[0009] Blade mounting positions are formed between the left frame and the adjacent left auxiliary vertical column, between the main vertical column and the adjacent left auxiliary vertical column, and between two adjacent left auxiliary vertical columns. The number of blade bodies in each blade assembly corresponds one-to-one with the number of blade mounting positions.

[0010] The leftmost second rotating shaft is rotatably connected to the left frame via a hinge assembly, the rightmost second rotating shaft is rotatably connected to the main vertical column via a hinge assembly, and the remaining second rotating shafts are rotatably connected to several of the left auxiliary vertical columns one by one via hinge assemblies. On several blade assemblies of each group of air conditioning units, the vertically aligned first rotating shafts are sequentially hinged via connecting rods, and any first rotating shaft at the leftmost end is hinged to the output end of the drive mechanism.

[0011] Furthermore, the first rotating shaft is welded to the corresponding drive shaft, and the second rotating shaft is welded to the corresponding driven shaft.

[0012] Furthermore, the hinge assembly includes a bearing housing and a rolling bearing installed inside the bearing housing. The driven shaft is sleeved with the inner ring of the corresponding rolling bearing. Several blade mounting seats are vertically spaced on the left frame, the column, and the right frame. The bearing housing and the corresponding blade mounting seats are detachably connected.

[0013] Furthermore, the mounting flange of the bearing housing has a waist-shaped hole, and the screw passes through the waist-shaped hole to fix the bearing housing to the corresponding column, left frame or right frame. A leveling shim is provided between the bearing housing and the corresponding column, left frame or right frame.

[0014] Both ends of the column and the beam are equipped with connecting flanges, which are detachably connected to the outer frame of the flow channel. A leveling gasket is provided between the connecting flange and the outer frame of the flow channel.

[0015] Furthermore, the connecting rod includes first joint bearings at both ends and a bidirectional threaded sleeve in the middle. One first joint bearing is connected to another first joint bearing in sequence through a right-hand threaded rod, a bidirectional threaded sleeve, and a left-hand threaded rod. The first joint bearing is sleeved on the corresponding drive shaft, and the first joint bearing and the corresponding drive shaft are fixed by a locking ring and a round nut.

[0016] Furthermore, the drive mechanism includes a servo motor, a screw jack, and two jack mounting bases. The output end of the servo motor is directly connected to the input end of the screw jack. The screw jack is rotatably mounted on the left side frame via the two jack mounting bases. The output screw of the screw jack is inclined upwards, and the screw forms a 30° angle with the vertical direction. The upper end of the screw is provided with a second joint bearing, which is sleeved on the corresponding drive shaft.

[0017] Furthermore, there are two left auxiliary vertical columns. The two left auxiliary vertical columns, the left side frame, and the main vertical column form three blade mounting positions. Each blade assembly includes three spaced-apart blade bodies, and the three blade bodies correspond one-to-one with the three blade mounting positions.

[0018] Furthermore, the column includes two first U-shaped rectifier strips arranged front and rear. The first U-shaped rectifier strip is a long strip-shaped component with a U-shaped cross-section. The first U-shaped rectifier strip is arranged vertically, and the U-shaped opening ends of the two first U-shaped rectifier strips are arranged opposite each other. The two first U-shaped rectifier strips are connected by several reinforcing beams and reinforcing ribs. The two sides of the U-shaped opening of the two first U-shaped rectifier strips are connected by corresponding mask plates.

[0019] The crossbeam includes two second U-shaped rectifier bars arranged front and rear. The second U-shaped rectifier bars are long strip-shaped components with a U-shaped cross-section. The second U-shaped rectifier bars are arranged horizontally, and the U-shaped opening ends of the two second U-shaped rectifier bars are arranged opposite each other. The second U-shaped rectifier bars are connected by several reinforcing beams and reinforcing ribs. The two sides of the U-shaped openings of the two second U-shaped rectifier bars are connected by corresponding mask plates.

[0020] Furthermore, an angle encoder is installed on each blade assembly.

[0021] Compared with the prior art, the beneficial effects of the present invention are as follows:

[0022] 1. This invention enables a blade assembly with a span of 22m to reciprocate at a constant speed of 1° / s within an angle range of -30° to +30°. The span, distribution interval, and number of the blade assembly are adapted to the cross-sectional dimensions of the wind tunnel, enabling full-section airflow control of the wind tunnel and effectively simulating multi-directional flow fields. This meets the testing requirements for takeoff and landing wind resistance tests, flight control algorithm verification tests, and flight comfort tests for aircraft with a span of 11m or less.

[0023] 2. The blade support structure of the present invention has good stability, which can effectively improve the stiffness of the large-span blade assembly in the span direction and reduce the deformation of the blade assembly. The device adopts a left-right symmetrical grouping design, and each group of blade assemblies consists of three blade bodies connected in series in the span direction, which can be manufactured and installed in sections, and has the advantage of being easy to process and manufacture.

[0024] 3. The connecting rod length of this invention is adjustable, which can effectively compensate for assembly errors. The blade assembly support adopts a "fixed end + sliding end" layout, which is suitable for the length-to-diameter ratio characteristics of large-span blade assemblies and the thermal expansion and contraction requirements under operating conditions. The blade mounting seat is provided with a waist-shaped hole, which, together with the leveling shim, has the advantage of easy coaxiality adjustment.

[0025] 4. The several sets of connecting rods of the present invention are arranged in an interlaced manner, connecting multiple sets of blade assemblies of the air regulating unit in parallel to form a parallelogram mechanism, directly driving one set of blade assemblies and driving the remaining blade assemblies to swing synchronously, so that each blade assembly can swing in parallel and efficiently in a compact space, which has the advantages of precise transmission and high driving efficiency.

[0026] 5. The present invention has a reasonable overall structural design and has the advantages of convenient manufacturing and processing, high reliability, compact structure and high driving efficiency. Attached Figure Description

[0027] Figure 1 This is an isometric view of the present invention;

[0028] Figure 2 This is the front view of the present invention;

[0029] Figure 3 This is the left view of the present invention;

[0030] Figure 4 for Figure 2 AA section view;

[0031] Figure 5 for Figure 2 BB cross-sectional view;

[0032] Figure 6 This is a schematic diagram of the blade support frame.

[0033] Figure 7 This is a schematic diagram of the air conditioning unit.

[0034] Figure 8 for Figure 3 Enlarged view of point C;

[0035] Figure 9 for Figure 4 Enlarged view of point D;

[0036] Figure 10 for Figure 4 Enlarged view of point E;

[0037] Figure 11 for Figure 4 Enlarged view at point F;

[0038] Figure 12 for Figure 8 HH sectional view;

[0039] Figure 13 for Figure 5 Enlarged view of point G;

[0040] Figure 14 for Figure 5 Enlarged view of point J.

[0041] In the diagram, 1. Blade support frame, 11. Crossbeam, 12. Column, 13. Cover plate, 14. First U-shaped rectifier bar, 15. Second U-shaped rectifier bar, 16. Main vertical column, 17. Blade mounting base, 18. Waist-shaped hole, 19. Leveling shim, 110. Reinforcing beam, 111. Reinforcing rib, 2. Air conditioning unit, 21. First rotating shaft, 22. Second rotating shaft, 23. Connecting rod, 231. First joint bearing, 232. Right-hand threaded rod, 233. Bidirectional threaded sleeve, 234. Left-hand threaded rod, 24. Drive shaft, 25. Drive mechanism, 251. Servo motor, 252. Screw jack, 253. Jack mounting base, 26. Driven shaft, 27. Blade assembly, 271. Blade body, 28. Hinge assembly, 281. 282. Bearing housing; 3. Rolling bearing; 4. Outer frame of flow channel; 5. Left frame. Detailed Implementation

[0042] To make the objectives, technical solutions, and advantages of this invention clearer, the invention is described below with reference to specific embodiments shown in the accompanying drawings. However, it should be understood that these descriptions are merely exemplary and not intended to limit the scope of the invention. Furthermore, descriptions of well-known structures and technologies are omitted in the following description to avoid unnecessarily obscuring the concept of the invention.

[0043] The connections mentioned in this invention are divided into fixed connections and detachable connections. Fixed connections, also known as non-detachable connections, include but are not limited to conventional fixed connection methods such as folded connections, riveted connections, adhesive connections, and welded connections. Detachable connections include but are not limited to conventional disassembly methods such as bolted connections, snap-fit ​​connections, pin connections, and hinged connections. When a specific connection method is not explicitly defined, it is assumed that at least one existing connection method can be found to achieve this function, and those skilled in the art can choose according to their needs. For example, a welded connection can be chosen for fixed connections, and a bolted connection can be chosen for detachable connections.

[0044] The present invention will be further described in detail below with reference to the accompanying drawings. The following embodiments are explanations of the present invention, but the present invention is not limited to the following embodiments.

[0045] Example: Figures 1 to 14 As shown, a large-span parallel blade wind-regulating device is installed inside the flow channel at the front end of the wind tunnel test section, including a blade support frame 1, a left wind-regulating assembly and a right wind-regulating assembly.

[0046] The outer frame 3 of the flow channel is a U-shaped frame. The blade support frame 1 is a grid-type support frame composed of an odd number of evenly arranged columns 12 and several evenly arranged crossbeams 11. The blade support frame 1 is installed on the inner periphery of the outer frame 3 of the flow channel. The column 12 in the middle is used as the main vertical column 16. The column 12 between the main vertical column 16 and the left side frame 31 of the outer frame 3 of the flow channel is used as the left secondary vertical column. The column 12 between the main vertical column 16 and the right side frame of the outer frame 3 of the flow channel is used as the right secondary vertical column. A left air adjustment component is provided between the main vertical column 16 and the left side frame 31. A right air adjustment component is provided between the main vertical column 16 and the right side frame. The left air adjustment component and the right air adjustment component have the same structure and are symmetrical.

[0047] The left air regulating assembly includes several vertically spaced air regulating units 2. Each air regulating unit 2 includes a drive mechanism 25, several blade assemblies 27, and several connecting rods 23. The blade assemblies 27 are horizontally arranged, and the several blade assemblies 27 are vertically spaced. The leading edge of each blade assembly 27 is hinged to the left frame 31, several left auxiliary vertical columns, and main vertical columns 16, respectively. The several blade assemblies 27 are sequentially hinged through several connecting rods 23, so that two adjacent blade assemblies 27 and the connecting rods 23 between them form a parallelogram four-bar linkage. The drive mechanism 25 is connected to the left frame 31, and the output end of the drive mechanism 25 drives the trailing edge of any blade assembly 27 to swing up and down.

[0048] The blade assembly 27 includes a plurality of blade bodies 271 arranged at intervals along the spanwise direction. Each blade body 271 includes a hollow frame, the outer surface of which is covered with a skin. Two thin-walled circular tubes are inserted into the blade body 271 along the spanwise direction. The two thin-walled circular tubes are arranged at intervals along the chordwise direction of the corresponding blade body 271. The thin-walled circular tube near the leading edge of the blade body 271 is used as a driven shaft 26, and the thin-walled circular tube near the trailing edge of the blade body 271 is used as a driving shaft 24. A plurality of driving shafts 24 in each blade assembly 27 are coaxially connected in sequence through a first rotating shaft 21, and a plurality of driven shafts 26 in each blade assembly 27 are coaxially connected in sequence through a second rotating shaft 22.

[0049] A blade mounting position is formed between the left frame 31 and the adjacent left auxiliary vertical column, between the main vertical column 16 and the adjacent left auxiliary vertical column, and between two adjacent left auxiliary vertical columns. The number of blade bodies 271 in each blade assembly 27 corresponds one-to-one with the blade mounting position.

[0050] The leftmost second rotating shaft 22 is rotatably connected to the left frame 31 via a hinge assembly 28. The rightmost second rotating shaft 22 is rotatably connected to the main vertical column 16 via a hinge assembly 28. The remaining second rotating shafts 22 are rotatably connected to several of the left auxiliary vertical columns via hinge assemblies 28. On several blade assemblies 27 of each group of air conditioning units 2, the vertically aligned first rotating shafts 21 are sequentially hinged via connecting rods 23. Any first rotating shaft 21 at the leftmost end is hinged to the output end of the drive mechanism 25.

[0051] The first rotating shaft 21 is welded to the corresponding drive shaft 24, and the second rotating shaft 22 is welded to the corresponding driven shaft 26.

[0052] The hinge assembly 28 includes a bearing housing 281 and a rolling bearing 282 installed inside the bearing housing 281. The driven shaft 26 is sleeved with the inner ring of the corresponding rolling bearing 282. Several blade mounting seats 17 are vertically spaced on the left frame 31, the column 12 and the right frame. The bearing housing 281 and the corresponding blade mounting seat 17 are detachably connected.

[0053] The bearing housing 281 has a waist-shaped hole 18 on its mounting flange. Screws pass through the waist-shaped hole 18 to fix the bearing housing 281 to the corresponding column 12, left frame 31 or right frame. A leveling shim 19 is provided between the bearing housing 281 and the corresponding column 12, left frame 31 or right frame to adjust the coaxiality between the driven shafts 26. The left air adjustment assembly and the right air adjustment assembly are symmetrically arranged about the vertical symmetry plane of the flow channel. The coaxiality error between the horizontally corresponding driven shafts 26 on the left air adjustment assembly and the right air adjustment assembly is no more than 2mm. After adjustment, the blade mounting seat 17 is fixed by angle steel and bolts.

[0054] Both ends of the column 12 and the crossbeam 11 are provided with connecting flanges. The connecting flanges are detachably connected to the outer frame 3 of the flow channel. A leveling shim 19 is provided between the connecting flanges and the outer frame 3 of the flow channel. Similarly, the leveling shim 19 can adjust the verticality of the column 12 and the horizontality of the crossbeam 11.

[0055] The connecting rod 23 includes first joint bearings 231 at both ends and a bidirectional threaded sleeve 233 in the middle. One first joint bearing 231 is connected to another first joint bearing 231 in sequence through a right-hand threaded rod 232, a bidirectional threaded sleeve 233, and a left-hand threaded rod 234. The first joint bearing 231 is sleeved on the corresponding drive shaft 24, and the first joint bearing 231 and the corresponding drive shaft 24 are fixed by a locking ring and a round nut. Rotating the bidirectional threaded sleeve 233 can adjust the overall length of the connecting rod 23 to accommodate two blade assemblies 27 with different spacing.

[0056] The drive mechanism 25 includes a servo motor 251, a screw jack 252, and two jack mounting bases 253. The output end of the servo motor 251 is directly connected to the input end of the screw jack 252, driving the trapezoidal lead screw of the screw jack 252 to move linearly. The screw jack 252 is rotatably mounted on the left frame 31 through the two jack mounting bases 253. The output lead screw of the screw jack 252 is inclined upward, and the lead screw forms a 30° angle with the vertical direction. The upper end of the lead screw is provided with a second joint bearing, which is sleeved on the corresponding drive shaft 24. The drive shaft drives the corresponding blade assembly 27 to drive the other blade assemblies 27 connected in parallel to swing synchronously.

[0057] The number of left auxiliary vertical columns is two. The two left auxiliary vertical columns form three blade mounting positions between the left side frame 31 and the main vertical column 16. Each blade assembly 27 includes three spaced-apart blade bodies 271, and the three blade bodies 271 correspond one-to-one with the three blade mounting positions.

[0058] The column 12 includes two first U-shaped rectifier bars 14 arranged front and rear. The first U-shaped rectifier bar 14 is a long strip-shaped component with a U-shaped cross-section. The first U-shaped rectifier bars 14 are arranged vertically. The U-shaped opening ends of the two first U-shaped rectifier bars 14 are arranged opposite each other. The two first U-shaped rectifier bars 14 are connected by several reinforcing beams 110 and reinforcing ribs 111. The two sides of the U-shaped opening of the two first U-shaped rectifier bars 14 are connected by a mask 13.

[0059] The crossbeam 11 includes two second U-shaped rectifier bars 15 arranged front and rear. The second U-shaped rectifier bars 15 are long strip-shaped components with a U-shaped cross-section. The second U-shaped rectifier bars 15 are arranged horizontally, and the U-shaped opening ends of the two second U-shaped rectifier bars 15 are arranged opposite each other. The second U-shaped rectifier bars 15 are connected by a number of reinforcing beams 110 and reinforcing ribs 111. The two sides of the U-shaped openings of the two second U-shaped rectifier bars 15 are connected by a cover plate 13.

[0060] Each blade assembly 27 is equipped with an angle encoder. The angle encoder detects the swing angle of the blade assembly 27 in real time, thereby controlling the working state of each drive mechanism 25 and achieving precise control of the swing of the blade assembly 27.

[0061] In this embodiment, the arrows in the figure represent the airflow direction. Both the left and right air adjustment components include six sets of air adjustment units 2. One set of air adjustment units 2 is provided with three layers of blade assemblies 27, and the other five sets of air adjustment units 2 are provided with two layers of blade assemblies 27. That is, both the left and right air adjustment components are provided with thirteen layers of blade assemblies 27.

[0062] The inner circumferential cross-sectional dimensions of the outer frame 3 of the flow channel are 22.82m × 13m, with a maximum incoming airflow velocity of 33m / s. The blade body 271 is the rear half of the NACA0005 standard airfoil, with a chord length of 0.5m and a span of 22m. The blade assembly 27 reciprocates at a uniform speed of 1° / s within the angle range of -30° to +30°. Thirteen layers of blade assemblies 27 are installed horizontally inside the outer frame 3 of the flow channel at equal intervals of 1m.

[0063] In this embodiment, a 5.5kW servo motor 251 is selected to drive a screw jack 252 with a rated load of 100kN. Due to the installation space limitation of 1m between adjacent blade assemblies 27, the axis of the screw jack 252 is arranged at a 30° angle to the vertical direction. The output lead screw of the screw jack 252 is a trapezoidal lead screw with a self-locking function, a reduction ratio of 1:32, and a stroke of ±150mm. Two jack mounting seats 253 are symmetrically arranged about the screw jack 252 and are fixed to the drive mechanism mounting bracket preset on the outer frame 3 of the wind tunnel flow channel by bolts. The jack mounting seats 253 are hinged to the double trunnions on the housing of the screw jack 252.

[0064] The blade support frame 1 is constructed by welding the main body together and is equipped with reinforcing ribs 111 to improve structural stability. The blade support frame 1 is integrally arranged inside the outer frame 3 of the flow channel and is connected to the inner wall of the outer frame 3 of the flow channel via a connecting flange, and is locked in place by a bolt group. The leveling gasket and rubber pad between the connecting flange and the outer frame 3 of the flow channel ensure installation accuracy and reduce vibration.

[0065] In this embodiment, the blade support frame 1 includes five columns 12 and three crossbeams 11, and the outer surfaces of the columns 12 and crossbeams 11 are respectively covered with a mask 13.

[0066] The rolling bearings 282 of the hinge assembly 28 on the left frame 31 are a pair of 7209AC / DB angular contact ball bearings. The inner ring of the angular contact ball bearing has a transition fit with the corresponding second rotating shaft 22. One side of the inner ring is attached to the shoulder end face of the corresponding second rotating shaft 22, and the other side is attached to the end face of the round nut, forming a bidirectional limiting structure, and double round nuts are used to prevent loosening. The outer ring of the angular contact ball bearing has a transition fit with the inner hole of the corresponding bearing housing 281. One side of the outer ring is attached to the shoulder end face of the corresponding bearing housing 281, and the other side is attached to the end cover of the bearing housing 281, achieving fixed support. An oil seal ring is provided on the inner side of the end cover of the bearing housing 281 to prevent impurities from entering.

[0067] The rolling bearing 282 of the hinge assembly 28 on the column 12 is a 22209 self-aligning roller bearing, and the bearing housing 281 on the column 12 and the mounting hole of the corresponding blade mounting seat 17 are fitted with clearance.

[0068] The inner ring of the self-aligning roller bearing has a transition fit with the corresponding second shaft 22. One side of the inner ring of the self-aligning roller bearing is in contact with the shoulder end face of the corresponding second shaft 22, and the other side is provided with an elastic retaining ring, forming a bidirectional limiting structure. The outer ring of the self-aligning roller bearing has a clearance fit with the inner hole of the corresponding bearing housing 281. The outer ring of the self-aligning roller bearing has no axial limiting components and is provided with free play space, allowing the second shaft 22 to freely expand and contract axially, meeting the displacement compensation requirements for thermal expansion and contraction.

[0069] The above embodiments are merely illustrative examples of the present invention and do not limit its scope of protection. Those skilled in the art can make partial changes to them, as long as they do not exceed the spirit and essence of the present invention, they are all within the scope of protection of the present invention.

Claims

1. A large-span parallel blade-type wind-regulating generator, installed inside the flow channel at the front end of a wind tunnel test section, characterized in that, Includes blade support frame (1), left air adjustment assembly and right air adjustment assembly; The outer frame (3) of the flow channel is a U-shaped frame. The blade support frame (1) is a grid-type support frame composed of an odd number of evenly arranged columns (12) and several evenly arranged beams (11). The blade support frame (1) is installed on the inner periphery of the outer frame (3) of the flow channel. The column (12) in the middle is used as the main vertical column (16). The column (12) between the main vertical column (16) and the left side frame (31) of the outer frame (3) of the flow channel is used as the left secondary vertical column. The column (12) between the main vertical column (16) and the right side frame of the outer frame (3) of the flow channel is used as the right secondary vertical column. A left air adjustment component is provided between the main vertical column (16) and the left side frame (31). A right air adjustment component is provided between the main vertical column (16) and the right side frame. The left air adjustment component and the right air adjustment component have the same structure and are symmetrical. The left air regulating component includes several vertically spaced air regulating units (2). Each air regulating unit (2) includes a drive mechanism (25), several blade assemblies (27), and several connecting rods (23). The blade assemblies (27) are horizontally arranged and the several blade assemblies (27) are vertically spaced. The leading edge of the blade assembly (27) is hinged to the left frame (31), several left auxiliary vertical columns, and main vertical columns (16), respectively. The several blade assemblies (27) are sequentially hinged through several connecting rods (23). The drive mechanism (25) is connected to the left frame (31). The output end of the drive mechanism (25) drives the trailing edge of any blade assembly (27) to swing up and down. The blade assembly (27) includes a plurality of blade bodies (271) arranged at intervals along the spanwise direction. Each blade body (271) includes a hollow frame. The outer surface of the hollow frame is covered with a skin. Two thin-walled round tubes are inserted into the blade body (271) along the spanwise direction. The two thin-walled round tubes are arranged at intervals along the chord direction of the corresponding blade body (271). The thin-walled round tube near the leading edge of the blade body (271) is used as the driven shaft (26), and the thin-walled round tube near the trailing edge of the blade body (271) is used as the driving shaft (24). The plurality of driving shafts (24) in each blade assembly (27) are coaxially connected in sequence through a first rotating shaft (21), and the plurality of driven shafts (26) in each blade assembly (27) are coaxially connected in sequence through a second rotating shaft (22). A blade mounting position is formed between the left frame (31) and the adjacent left auxiliary vertical column, between the main vertical column (16) and the adjacent left auxiliary vertical column, and between two adjacent left auxiliary vertical columns. The number of blade bodies (271) of each blade assembly (27) corresponds one-to-one with the blade mounting position. The leftmost second rotating shaft (22) is rotatably connected to the left frame (31) through the hinge assembly (28), the rightmost second rotating shaft (22) is rotatably connected to the main vertical column (16) through the hinge assembly (28), and the remaining second rotating shafts (22) are rotatably connected to several of the left auxiliary vertical columns one by one through the hinge assembly (28). On several blade assemblies (27) of each group of air conditioning units (2), the vertically aligned first rotating shafts (21) are sequentially hinged through the connecting rod (23), and any first rotating shaft (21) at the leftmost end is hinged to the output end of the drive mechanism (25).

2. The large-span parallel blade-type wind-regulating generator according to claim 1, characterized in that: The first rotating shaft (21) is welded to the corresponding drive shaft (24), and the second rotating shaft (22) is welded to the corresponding driven shaft (26).

3. The large-span parallel blade-type wind-regulating generator according to claim 1, characterized in that: The hinge assembly (28) includes a bearing housing (281) and a rolling bearing (282) installed inside the bearing housing (281). The driven shaft (26) is sleeved with the inner ring of the corresponding rolling bearing (282). Several blade mounting seats (17) are vertically spaced on the left frame (31), the column (12) and the right frame. The bearing housing (281) and the corresponding blade mounting seat (17) are detachably connected.

4. The large-span parallel blade type wind-regulating generator according to claim 3, characterized in that: The mounting flange of the bearing housing (281) has a waist-shaped hole (18). The screw passes through the waist-shaped hole (18) to fix the bearing housing (281) to the corresponding column (12), left frame (31) or right frame. A leveling shim (19) is provided between the bearing housing (281) and the corresponding column (12), left frame (31) or right frame. Both ends of the column (12) and the beam (11) are provided with connecting flanges, which are detachably connected to the outer frame (3) of the flow channel, and a leveling gasket (19) is provided between the connecting flange and the outer frame (3).

5. A large-span parallel blade-type wind-regulating generator according to claim 1, characterized in that: The connecting rod (23) includes first joint bearings (231) at both ends and a bidirectional threaded sleeve (233) in the middle. One first joint bearing (231) is connected to another first joint bearing (231) in sequence through a right-hand threaded rod (232), a bidirectional threaded sleeve (233), and a left-hand threaded rod (234). The first joint bearing (231) is sleeved on the corresponding drive shaft (24), and the first joint bearing (231) and the corresponding drive shaft (24) are fixed by a locking ring and a round nut.

6. The large-span parallel blade type wind-regulating generator according to claim 1, characterized in that: The drive mechanism (25) includes a servo motor (251), a screw jack (252), and two jack mounting bases (253). The output end of the servo motor (251) is directly connected to the input end of the screw jack (252). The screw jack (252) is rotatably mounted on the left side frame (31) through the two jack mounting bases (253). The output screw of the screw jack (252) is inclined upward. The screw makes a 30° angle with the vertical direction. The upper end of the screw is provided with a second joint bearing. The second joint bearing is sleeved on the corresponding drive shaft (24).

7. A large-span parallel blade-type wind-regulating generator according to claim 1, characterized in that: The number of left auxiliary vertical columns is two. The two left auxiliary vertical columns form three blade mounting positions between the left side frame (31) and the main vertical column (16). Each blade assembly (27) includes three spaced blade bodies (271), and the three blade bodies (271) correspond one-to-one with the three blade mounting positions.

8. A large-span parallel blade-type wind-regulating generator according to claim 1, characterized in that: The column (12) includes two first U-shaped rectifier strips (14) arranged in front and behind. The first U-shaped rectifier strip (14) is a long strip-shaped component with a U-shaped cross-section. The first U-shaped rectifier strip (14) is arranged vertically. The U-shaped opening ends of the two first U-shaped rectifier strips (14) are arranged opposite each other. The two first U-shaped rectifier strips (14) are connected by several reinforcing beams (110) and reinforcing ribs (111). The two sides of the U-shaped opening of the two first U-shaped rectifier strips (14) are connected by a mask (13). The crossbeam (11) includes two second U-shaped rectifier bars (15) arranged front and rear. The second U-shaped rectifier bar (15) is a long strip-shaped component with a U-shaped cross section. The second U-shaped rectifier bar (15) is set horizontally. The U-shaped opening ends of the two second U-shaped rectifier bars (15) are set opposite to each other. The second U-shaped rectifier bars (15) are connected to each other by several reinforcing beams (110) and reinforcing ribs (111). The two sides of the U-shaped opening of the two second U-shaped rectifier bars (15) are connected by a mask plate (13).

9. A large-span parallel blade-type wind-regulating generator according to any one of claims 1-8, characterized in that: An angle encoder is installed on each blade assembly (27).

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