CN108760229B - Wind tunnel test wake flow measurement lifting device - Google Patents
Wind tunnel test wake flow measurement lifting device Download PDFInfo
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- CN108760229B CN108760229B CN201810839193.8A CN201810839193A CN108760229B CN 108760229 B CN108760229 B CN 108760229B CN 201810839193 A CN201810839193 A CN 201810839193A CN 108760229 B CN108760229 B CN 108760229B
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- 238000012360 testing method Methods 0.000 title claims abstract description 64
- 238000005259 measurement Methods 0.000 title claims abstract description 39
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- 229910000831 Steel Inorganic materials 0.000 description 5
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
- G01M9/00—Aerodynamic testing; Arrangements in or on wind tunnels
- G01M9/06—Measuring arrangements specially adapted for aerodynamic testing
- G01M9/062—Wind tunnel balances; Holding devices combined with measuring arrangements
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Abstract
The invention provides a wind tunnel test wake flow measurement lifting device, which comprises a base, a lifting mechanism and an instrument mounting bracket, wherein the lifting mechanism is arranged on the base to drive the instrument mounting bracket to move along the vertical direction; the horizontal cross beam penetrates through the sleeve and is fixed on the sleeve through a fastening screw; the horizontal cross beam is provided with a plurality of fixing holes, a plurality of locking screw holes are formed corresponding to the fixing holes, the fixing holes are arranged at intervals along the length direction of the horizontal cross beam, and each fixing hole vertically penetrates through the horizontal cross beam; each locking screw hole is communicated with the corresponding fixing hole, and each locking screw hole is in threaded connection with a locking screw. The wind tunnel test wake flow measurement lifting device can improve the efficiency and the precision of wake flow measurement.
Description
Technical Field
The invention relates to a wind tunnel test measuring device, in particular to a wake flow measuring lifting device for a wind tunnel test.
Background
The wake flow measuring lifting device for the wind tunnel test is a wind parameter measuring lifting platform for wake flow effect in the wind tunnel test. When the air flows through, the turbulence vortex flow of the downstream of the non-streamline models of wind turbines, buildings, structures and the like is called wake flow, the flow field of the downstream wake flow area is complex and can keep a long distance, and the turbulence vortex flow has a great influence on other objects in the wake flow. In wake measurement, a high density of wind field characteristics at lateral, longitudinal and vertical locations is required. In order to obtain wind field characteristics of different positions of wake flow areas in a wind tunnel test, two measuring platforms mainly exist at present: (1) Manually measuring different positions of the wake field by using a pitot tube or a handheld anemometer; such methods are time consuming and laborious and subject to significant human error. (2) The three-dimensional moving and measuring frame realizes wind parameter acquisition of tail flow fields at different positions by controlling moving wind speed detectors with different degrees of freedom; the method has high cost, complex installation and heavy structure. The two measuring platforms have advantages and disadvantages, so that it is necessary to design and develop an automatic acquisition platform which is flexible and rapid and can acquire wake wind field parameters at different positions in a large range.
The Chinese patent application with publication number of CN105135170A discloses an automatic lifting device of a wind tunnel wind speed monitor, wherein a three-dimensional pulsation wind speed monitor for collecting data is only arranged on a connecting piece at the front end of an extension bracket, the measuring points are fewer, the automatic lifting device is suitable for measuring wind speed and wind pressure of a wind field in front of a building, when the automatic lifting device is used for wake flow testing of the downstream of the building, the automatic lifting device is troublesome to use, the testing efficiency is low, and the repeated moving device possibly reduces the testing precision. The Chinese patent application with publication number of CN107576471A discloses a horizontal anemometer bracket which is used for collecting wind speed in a wind tunnel and can vertically adjust multi-point observation, and a plurality of anemometers are arranged on a horizontal beam so as to realize multi-point observation. Although the number of times of the mobile device can be reduced, the two ends of the horizontal cross beam are connected with the screw rods and are fixed and limited through the thread components. When the height of the horizontal cross beam needs to be adjusted, screw thread components on the two screws need to be respectively rotated, so that the use is inconvenient, the horizontal cross beam is difficult to adjust to be horizontal, and the test precision is affected; and the levelness of the horizontal cross beam needs to be adjusted every time the horizontal cross beam is lifted, so that the testing efficiency is reduced. In addition, the horizontal anemometer bracket occupies a large area, and when the horizontal anemometer bracket is not used, the horizontal anemometer bracket can be stored in a large space, so that space is wasted.
Disclosure of Invention
In view of the above-mentioned problems, it is necessary to provide a wind tunnel test wake flow measurement lifting device, which can improve the test efficiency and the test precision, and is convenient to store when not in use.
In order to achieve the above purpose, the technical scheme adopted by the invention is as follows:
the wind tunnel test wake flow measuring lifting device comprises a base, a lifting mechanism and an instrument mounting bracket, wherein the lifting mechanism is arranged on the base to drive the instrument mounting bracket to move along the vertical direction, the instrument mounting bracket comprises a sleeve and a horizontal cross beam, the sleeve is connected with the lifting mechanism and is horizontally arranged, at least one fastening screw hole is formed in the sleeve, and the fastening screw hole is in threaded connection with a fastening screw; the horizontal cross beam penetrates through the sleeve and is arranged on the sleeve through the fastening screw; the horizontal cross beam is provided with a plurality of fixing holes, a plurality of locking screw holes are formed corresponding to the fixing holes, the fixing holes are arranged at intervals along the length direction of the horizontal cross beam, and each fixing hole vertically penetrates through the horizontal cross beam; each locking screw hole is communicated with the corresponding fixing hole, and each locking screw hole is in threaded connection with a locking screw.
Further, the fixing holes are uniformly distributed at intervals, and the fixing holes are symmetrically distributed on the horizontal cross beam by taking the middle position of the sleeve as a symmetry center.
Further, the number of the fixing holes is an odd number, a position avoiding hole is vertically formed in the middle of the sleeve in a penetrating mode, and the position avoiding hole is aligned with the fixing hole in the center of the horizontal cross beam; a through hole is further formed in the middle of the sleeve so as to allow a locking screw corresponding to a fixing hole in the center of the horizontal cross beam to pass through; the distance between the end part of the sleeve and the middle position of the sleeve is smaller than the distance between two adjacent fixing holes.
Further, the lifting mechanism comprises a guide frame, a screw rod, a lifting nut, a supporting frame and a driving piece, wherein the guide frame is arranged on the base, the screw rod is rotatably arranged on the base and extends along the vertical direction, and the lifting nut is in threaded connection with the screw rod and is in sliding connection with the guide frame; the supporting frame is fixed on the lifting nut and is connected with the sleeve; the driving piece is arranged on the base and connected with the screw rod to drive the screw rod to rotate.
Further, the base comprises a bottom plate and a containing box fixed on the top surface of the bottom plate, the guide frame is arranged on the containing box, and one end of the screw rod movably penetrates through the containing box and is rotationally connected with the bottom plate; the driving piece comprises a servo driving device, a servo motor and a worm, wherein the servo driving device and the servo motor are arranged on the bottom plate and are connected with each other, the worm is arranged on a motor shaft of the servo motor and is contained in the containing box, a gear is fixedly sleeved on the screw, and the gear is positioned in the containing box and meshed with the worm.
Further, the guide frame comprises a fixed plate and two guide posts, one side of the fixed plate is arranged on the accommodating box, and a mounting hole is formed in the fixed plate in a penetrating manner; one ends of the two guide posts are connected with one side of the fixing plate, which is opposite to the accommodating box, and are respectively positioned at two opposite sides of the mounting hole; the screw rod penetrates through the mounting hole; the lifting nut is positioned between the two guide posts and is in sliding connection with the two guide posts.
Further, the two guide posts are symmetrical upright posts with arc-shaped cross sections, and the outer surface of each guide post is arc-shaped.
Further, a flange is arranged on the outer wall of the screw rod, and the flange is rotatably connected with the mounting hole.
Further, the free tail ends of the two guide posts are respectively provided with external threads; the guide frame further comprises a top sleeve, the top sleeve comprises a sleeve body, and an inner thread matched with the outer thread on the guide post for use is arranged on the inner wall of the sleeve body; a bulge is also arranged in the sleeve body, and a sleeve joint space is formed between the bulge and the sleeve body; the bulge is provided with a sleeving hole, and the free tail ends of the two guide posts are inserted into the sleeving space and are in threaded connection with the sleeve body; the free tail end of the screw rod is rotatably inserted into the sleeve joint hole.
Further, a first scale mark and a second scale mark are arranged on the bottom plate, and the first scale mark and the second scale mark are mutually perpendicular.
By adopting the technical scheme, the invention has the following beneficial effects:
1. according to the wake flow measuring and lifting device for the wind tunnel test, wind field parameters of wake flow areas of the same horizontal plane can be observed and collected at multiple points at the same time, the horizontal cross beam can be lifted vertically to change the vertical height of test instruments such as pitot tubes, and wind field parameter data of grid points at different positions of the vertical section of the wake flow areas can be obtained. By moving the base, wind field parameter data of grid points with different sections in the wake flow area can be obtained, and the wake flow test method is particularly suitable for wake flow measurement and can improve wake flow test efficiency. Meanwhile, the horizontal cross beam is connected with the lifting mechanism through the sleeve arranged horizontally, the horizontal cross beam can be ensured to be horizontal by the sleeve arranged horizontally, the testing precision is improved, the levelness of the horizontal cross beam is not required to be adjusted in the subsequent process of lifting the horizontal cross beam, and the testing efficiency is further improved. The horizontal cross beam and the sleeve are installed through the fastening screw, and the horizontal cross beam can be conveniently detached from the sleeve when not in use, so that the occupied area of the device is reduced, and the device is convenient to store.
2. According to the wind tunnel test wake flow measuring lifting device, the first scale marks and the second scale marks arranged on the base can position the base in a front-back and left-right moving mode, the position of the base is measured without the aid of the measuring ruler, and the wind tunnel test wake flow measuring lifting device is convenient to use and can further improve testing efficiency.
Drawings
FIG. 1 is a schematic structural diagram of a wake-up device for measuring wake-up in a hole test according to a preferred embodiment of the present invention.
Fig. 2 is a schematic top view of a base plate of the wind tunnel test wake measurement lifting device shown in fig. 1.
Fig. 3 is a schematic diagram showing connection between a driving member and a housing box in the wake flow measurement lifting device for wind tunnel test shown in fig. 1.
Fig. 4 is a schematic diagram showing connection between a screw rod, a guide frame and a top sleeve in the wake flow measurement lifting device for the wind tunnel test shown in fig. 1.
FIG. 5 is an exploded view of a portion of the structure of the wind tunnel test wake measurement lifting device shown in FIG. 4.
Fig. 6 is a perspective view of the wind tunnel test wake measurement lifting device shown in fig. 4 with the top cover at another view angle.
Fig. 7 is a schematic diagram of connection among a screw, a lifting nut, a supporting frame, a counterweight rod and a sleeve in the wake flow measurement lifting device for the wind tunnel test shown in fig. 1.
Fig. 8 is a perspective view of the lifting nut of fig. 7.
Fig. 9 is a top view of the gear and worm connection of the wind tunnel test wake measurement lifting device shown in fig. 1.
Fig. 10 is an exploded view of the sleeve of fig. 7 from a top view.
Fig. 11 is an exploded view of the horizontal cross member of fig. 1 from a top view.
FIG. 12 is a reference view of the use state of the wake-up device for wind tunnel test of FIG. 1.
Fig. 13 is a schematic view of a part of the wind tunnel test wake flow measurement lifting device shown in fig. 12.
Description of the main reference signs
100-wind tunnel test wake flow measuring lifting device, 2-base, 21-bottom plate, 22-containing box, 23-first scale line, 24-second scale line, 25-mounting groove, 26-mounting hole, 27-penetrating hole, 3-lifting mechanism, 31-guide frame, 312-fixing plate, 314-guide post, 315-mounting hole, 316-external thread, 32-screw rod, 321-first polish rod part, 323-second polish rod part, 325-thread part, 326-flange, 33-gear, 34-lifting nut, 342-nut body, 343-arc surface, 344-guide sleeve, 346-threaded hole, 35-support frame 352-first support rod, 351-second support rod, 36-counterweight rod, 37-top sleeve, 372-sleeve body, 374-internal thread, 375-protrusion, 376-sleeve space, 377-sleeve hole, 38-driving piece, 381-servo driving device, 382-servo motor, 383-worm, 4-instrument mounting bracket, 41-sleeve, 412-avoidance hole, 413-through hole, 414-fastening screw hole, 415-fastening screw, 43-horizontal beam, 432-fixing hole, 434-locking screw hole, 436-locking screw, 200-computer, 300-pressure acquisition equipment, 400-pitot tube, 500-cable.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
It will be understood that when an element is referred to as being "fixed to" another element, it can be directly on the other element or intervening elements may also be present. When a component is considered to be "connected" to another component, it can be directly connected to the other component or intervening components may also be present. When an element is referred to as being "disposed on" another element, it can be directly on the other element or intervening elements may also be present. The terms "vertical," "horizontal," "left," "right," and the like are used herein for illustrative purposes only.
Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used herein in the description of the invention is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. The term "and/or" as used herein includes any and all combinations of one or more of the associated listed items.
Referring to fig. 1, a preferred embodiment of the present invention provides a wind tunnel test wake flow measurement lifting device 100, which includes a base 2, a lifting mechanism 3 and an instrument mounting bracket 4. The lifting mechanism 3 is mounted on the base 2 to drive the instrument mounting bracket 4 to reciprocate in a vertical direction.
The base 2 includes a bottom plate 21 and a housing box 22 fixed to the top surface of the bottom plate 21. Referring to fig. 2, the bottom plate 21 is made of a rigid steel plate with a square shape of 40cm×40cm, and has a top surface provided with a first graduation mark 23 and a second graduation mark 24, wherein the first graduation mark 23 and the second graduation mark 24 are perpendicular to each other. In the present embodiment, the number of the first graduation marks 23 and the second graduation marks 24 is two, the two first graduation marks 23 are marked on two opposite sides of the base 21, and the two second graduation marks 24 are marked on two other opposite sides of the base 21. A mounting groove 25 is concavely provided at a substantially central position of the top surface of the bottom plate 21. Referring to fig. 3, the accommodating box 22 is in a shape of a substantially cubic box, the accommodating box 22 is fixed on the top surface of the bottom plate 21, the accommodating box 22 is provided with a mounting hole 26, the mounting hole 26 penetrates through the top surface and the bottom surface of the accommodating box 22, and is located on the same vertical line with the mounting groove 25; the side surface of the accommodating case 22 is provided with a penetrating hole 27 communicating with the inside of the accommodating case 22.
Referring again to fig. 1, the lifting mechanism 3 includes a guide frame 31, a screw 32, a lifting nut 34, a supporting frame 35, and a driving member 38. The guide frame 31 is mounted on the accommodation box 22; one end of the screw 32 movably penetrates the accommodating box 22 and is rotatably connected with the bottom plate 21; the lifting nut 34 is in threaded connection with the screw rod 32 and is in sliding connection with the guide frame 31; the supporting frame 35 is fixed on the lifting nut 34; a drive 38 is coupled to the screw 32 to drive the screw 32 in rotation.
Referring to fig. 4 and 5, in the present embodiment, the guide frame 31 includes a fixing plate 312 and two guide posts 314, one side of the fixing plate 312 is mounted on the top surface of the accommodating box 22 opposite to the bottom plate 21, and a mounting hole 315 is formed through the fixing plate 312; one end of each guide post 314 is connected to a side of the fixing plate 312 facing away from the accommodating box 22, and is located at two opposite sides of the mounting hole 315. In this embodiment, the two guide posts 314 are parallel to each other and perpendicular to the bottom plate 21. The two guide posts 314 are symmetrical columns with an arcuate cross section, and the outer surfaces of the two guide posts are arc-shaped to reduce the resistance of wake wind speed experienced by the guide posts 314 during measurement. The free end of each post is provided with external threads 316.
The screw 32 is located between the two guide posts 314 and extends in a vertical direction. The screw 32 includes a first polish rod portion 321, a second polish rod portion 323, and a threaded portion 325 connected between the first polish rod portion 321 and the second polish rod portion 323, where the first polish rod portion 321 and the second polish rod portion 323 are disposed opposite to each other. The first polish rod 321 sequentially passes through the mounting hole 315 on the fixing plate 312 and the mounting hole 26 (fig. 3) on the accommodating box 22 to be rotatably connected with the mounting groove 25 (fig. 2) on the bottom plate 21. The outer wall of the first polish rod portion 321 is provided with a flange 326, and the flange 326 is rotationally connected with the mounting hole 315, so that the rotation of the screw 32 is more stable. The first polish rod 321 is fixedly sleeved with a gear 33, and the gear 33 is accommodated in the accommodating box 22 and is positioned at one side of the flange 326, which is opposite to the threaded portion 325.
Referring to fig. 7 and 8, the lifting nut 34 is preferably made of high strength steel. The lift nut 34 is located between the two guide posts 314, and is screwed with the threaded portion 325 of the screw 32 and slidably connected to the two guide posts 314. In the present embodiment, the lifting nut 34 includes a nut body 342 and a guide sleeve 344, the nut body 342 is substantially in a rectangular block shape, and one side surface thereof is an arc surface 343, so as to reduce the resistance of wake wind speed received by the lifting nut 34 during measurement. The guide sleeve 344 is mounted on the side of the nut body 342 facing away from the base 2, i.e. on the top surface of the nut body 342. The guide sleeve 344 has an outer diameter smaller than the outer diameter of the nut body 342 to form a wire passing space (not shown) between the guide sleeve 344 and the guide post 314 for the cable to pass through. The lift nut 34 is provided with a threaded hole 346, and the threaded hole 346 penetrates the nut body 342 and the guide sleeve 344 along the approximate central axis of the lift nut 34. The lifting nut 34 is sleeved on the threaded portion 325 of the screw 32 through the threaded hole 346 and is in threaded connection with the screw 32, and two opposite sides of the nut body 342 are respectively in sliding connection with the two guide posts 314 so as to limit the rotation of the lifting nut 34 through the two guide posts 314. Preferably, a guide rail may be further provided on a side of the guide post 314 facing the nut body 342, and a slide rail is correspondingly provided on the nut body 342, so as to guide the movement of the lifting nut 34 through the cooperation of the slide rail and the guide rail.
In the present embodiment, the support 35 includes a first support bar 352 and a second support bar 351. The first support rod 352 and the second support rod 351 are both disposed on the nut body 342 and located at a side of the nut body 342 opposite to the arc surface 343 thereof. Referring to fig. 12, the first support bar 352 is disposed obliquely with respect to a horizontal plane, and one end of the first support bar is connected to the nut body 342; the second support rod 351 is disposed above the first support rod 352 and perpendicular to the screw 32, and one end of the second support rod 351 is connected to the nut body 342, and the other end is connected to the free end of the first support rod 352. The first support rod 352, the second support rod 351 and the nut body 342 form a triangle frame body, so that the structure is more stable. Preferably, the first support rod 352, the second support rod 351 and the nut body 342 are fixedly connected by welding. It will be appreciated that it may be connected in other ways. In this embodiment, the arc surface 343 of the nut body 342 is connected with the weight bar 36, the weight bar 36 and the second support bar 351 are located on the same line, the weight bar 36 has a weight function, which can balance the gravity center of the whole device, so that the whole device is not easy to fall down, and winding can be facilitated, and the confusion of the equipment cable 500 during testing is avoided.
Referring to fig. 4 and 6, in the present embodiment, the guide frame 31 further includes a top cover 37. The top sleeve 37 comprises a sleeve body 372, and an inner thread 374 matched with the outer thread 316 on the guide post 314 is arranged on the inner wall of the sleeve body 372; the sleeve 372 is also provided with a protrusion 375, and a sleeving space 376 is defined between the protrusion 375 and the sleeve 372. The bulge 375 is provided with a sleeve hole 377, and the free tail ends of the two guide posts 314 are inserted into the sleeve space 376 and are in threaded connection with the sleeve 372; the second polish rod portion 323 of the screw 32 is rotatably inserted into the socket hole 377. The screw 32 is in closed connection with the two guide posts 314 through the top sleeve 37, so that the screw 32 can rotate more stably, and the two guide posts 314 are in closed connection through the top sleeve 37, so that the guide posts 314 can limit the rotation of the lifting nut 34 more reliably.
Referring to fig. 1, 3 and 9, the driving member 38 includes a servo driving device 381, a servo motor 382 and a worm 383. The servo driving device 381 and the servo motor 382 are both mounted on the base plate 21 and connected to each other. The motor shaft of the servo motor 382 is rotatably inserted through the insertion hole 27 of the housing box 22, the worm 383 is mounted on the motor shaft of the servo motor 382 and housed in the housing box 22, and the worm 383 is meshed with the gear 33 on the screw 32. In use, the servo drive 381 is connected to a computer 200 via connecting lines and data lines. The computer 200 converts the output digital signal into a pulse signal through the servo driving device 381, and controls the corresponding rotation response of the worm 383 on the shaft of the servo motor 382 through the pulse signal, and the worm 383 drives the gear 33 to rotate stably so as to realize the associated rotation of the screw 32, and further drives the lifting nut 34 to perform lifting motion along the screw 32.
The instrument mounting bracket 4 comprises a sleeve 41 and a horizontal cross beam 43, wherein the sleeve 41 is arranged on a connecting point of the first support rod 352 and the second support rod 351 and is horizontally arranged; the horizontal cross member 43 is detachably inserted into the sleeve 41.
Referring to fig. 1 and 11 to 13, in the present embodiment, 11 fixing holes 432 are formed in the horizontal beam 43, and 11 locking screw holes 434 are formed corresponding to the 11 fixing holes 432, wherein the 11 fixing holes 432 are uniformly spaced along the length direction of the horizontal beam 43, and each fixing hole 432 vertically penetrates through the horizontal beam 43 for mounting a test instrument such as a pitot tube 400 or a wind speed detector. Each locking screw hole 434 extends in a horizontal direction and communicates with the corresponding fixing hole 432, and each locking screw hole 434 is screwed with a locking screw 436 for fixing the test instrument in the fixing hole 432. In this embodiment, locking screw 436 is located on the side of horizontal beam 43 facing away from support frame 35 for ease of operation. The horizontal beam 43 is preferably made of high strength steel pipe, which has superior strength, and the hollow steel pipe can reduce the weight of the horizontal beam 43.
The horizontal cross beam 43 is provided with a sleeve 41. Referring to fig. 10, the sleeve 41 is preferably made of a steel tube, and the middle position of the sleeve 41 is vertically perforated with the avoidance holes 412, when the horizontal cross beam 43 is inserted into the sleeve 41, the 11 fixing holes 432 are symmetrically distributed on the horizontal cross beam 43 with the middle position of the sleeve 41 as a symmetry center, so that the device is stable and not easy to topple, and the fixing hole 432 at the center of the horizontal cross beam 43 is aligned with the avoidance holes 412 on the sleeve 41, so that the corresponding test instruments such as the pitot tube 400 can pass through. The middle position of the sleeve 41 is also provided with a through hole 413 communicating with the inside of the sleeve 41 in the horizontal direction to pass through a locking screw 436 corresponding to a fixing hole 432 in the center of the horizontal beam 43. The sleeve 41 is provided with two fastening screw holes 414, and the two fastening screw holes 414 are respectively positioned at two opposite sides of the avoidance hole 412 and are positioned at one side of the sleeve 41 opposite to the support frame 35. Each fastening screw hole 414 extends in the horizontal direction and communicates with the inside of the sleeve 41, and a fastening screw 415 is screwed to each fastening screw hole 414, and the horizontal cross member 43 can be abutted against the sleeve 41 by the fastening screw 415. The distance between the end of the sleeve 41 and the intermediate position of the sleeve 41 is smaller than the distance between the adjacent two fixing holes 432.
As shown in fig. 12 to 13, in the wind tunnel wake measurement test, a plurality of pitot tubes 400 are mounted on the horizontal cross member 43, specifically: firstly, the horizontal cross beam 43 is inserted into the sleeve 41, so that a fixing hole 432 in the middle of the horizontal cross beam 43 is aligned with a avoidance hole 412 in the center of the sleeve 41, and a fastening screw 415 is screwed, so that the horizontal cross beam 43 is abutted against the sleeve 41, the position of the horizontal cross beam 43 can be positioned through the fixing hole 432 and the avoidance hole 412, and the fixing hole 432 is symmetrically distributed with the middle position of the sleeve 41 as a symmetrical center. Pitot tube 400 is then inserted into corresponding securing hole 432 and locking screw 436 is finally tightened to secure Pitot tube 400 against horizontal cross member 43. The pitot tube 400 is connected with the pressure acquisition device 300 and the computer 200 through the cable 500 for acquiring data, the cable 500 passes through a wire passing space formed by the guide sleeve 344 and the guide post 314 and is supported on the nut body 342, and then is clamped on the counterweight rod 36 and the second support rod 351 through the clamp, so that the cable disorder can be avoided, and the cable 500 can be prevented from being worn due to contact with the rotating screw rod 32. The lifting nut 34, the sleeve 41 fixed on the lifting nut 34 and the horizontal cross beam 43 are lifted by controlling the driving piece 38 to drive the screw rod 32 to rotate through the computer 200, so that the pitot tube 400 measures wind field characteristic data of different heights in the wake area. Wind field characteristic data of different vertical sections of the wake area can be measured by moving the base 2 back and forth and left and right, the position of the base 2 moving back and forth can be positioned by utilizing the first graduation marks 23 on the bottom plate 21, and the position of the base 2 moving left and right can be positioned by utilizing the second graduation marks 24 on the bottom plate 21. When the base 2 is fixed, the embodiment of the invention has the measurement width range of 0-1.1 m and the height range of 0-1.5 m in the wind tunnel. When the wind tunnel test wake flow measuring lifting device 100 is not in use, the locking screws 436 can be unscrewed, the pitot tubes 400 can be detached from the horizontal cross beams 43 one by one, then the fastening screws 415 can be unscrewed, and the horizontal cross beams 43 can be pulled out of the sleeves 41.
The wind tunnel test wake flow measurement lifting device 100 of the embodiment of the invention has the advantages of high working efficiency, flexible structure and good reliability. Lifting platforms for collecting wake pressure parameters in the wind tunnel at different levels are provided for the pitot tubes 400 through lifting of the horizontal cross beams 43, and wake pressure parameter data of a designated position in the vertical section range in the wind tunnel are finally obtained; through the movement of the horizontal cross beam 43 on grid points with different sections in the wake area, the wind field parameter data of the three-dimensional grid points in the wake area are measured efficiently, rapidly and accurately, the measurement time is greatly shortened, the test period and the labor cost are reduced, the test error and the workload can be reduced, and the test work efficiency and the test accuracy are improved.
According to the wind tunnel test wake flow measurement lifting device 100, at most, 11 wind speed detectors such as pitot tubes 400 or cobra can be fixedly installed, compared with manual measurement or measurement by moving a measurement frame, the measurement efficiency can be improved by 11 times, and automatic measurement of a plurality of wind speed detectors at different heights can be realized through the driving piece 38, so that the wind tunnel test wake flow measurement lifting device is rapid and efficient in measurement, easy to control and convenient to operate.
The wind tunnel test wake flow measurement lifting device 100 provided by the embodiment of the invention can be used for placing a plurality of pitot tubes 400, can be used for collecting wake flow area wind field parameters in a large range after being connected with the pressure collecting equipment 300, can also be used for carrying out various test works by wind field debugging and flow field checking, increases the use function and improves the working efficiency.
Compared with the existing manual operation and wind tunnel frame moving and measuring device, the wind tunnel test wake flow measuring lifting device 100 optimizes the manual operation, simplifies the heavy structure of the wind tunnel frame moving and measuring device, and has the advantages of convenience in operation, difficulty in damage, small occupied space, wide testing range area, clear working principle, good testing effect, moderate cost and the like.
According to the wind tunnel test wake flow measurement lifting device 100, the position of the base 2 moving forwards and backwards and leftwards and rightwards can be positioned through the first graduation mark 23 and the second graduation mark 24 arranged on the base 2, a measuring ruler does not need to be additionally arranged for measuring the position of the base 2, the use is convenient, and the test efficiency can be further improved.
It will be appreciated that the wind tunnel test wake flow measurement lifting device 100 according to the embodiment of the present invention can achieve the effects described in the foregoing embodiments as long as the device has the foregoing elements, however, the manufacturer can add other elements according to actual needs to maintain the beauty and stability of the wind tunnel test wake flow measurement lifting device 100, or change the shape and structure of the base 2, the lifting mechanism 3, the supporting frame 35 …, etc., and is not limited to the embodiment of the present invention.
It is to be understood that in other embodiments, the bottom plate 21 is not limited to a cubic plate shape, and may be provided in other shapes, such as a circular plate shape, and the size thereof is not limited to the present embodiment, and may be provided in other sizes as needed.
It will be appreciated that the screw 32 may be rotatably mounted at other positions on the base 2, not limited to the intermediate position of the present embodiment.
It will be appreciated that other lifting mechanisms 3 may be used to drive the lifting of the instrument mounting bracket 4.
It will be appreciated that the structure of the support 35 is not limited to this embodiment, as long as it can fix the sleeve 41 with the lifting nut 34.
It will be appreciated that the drive 38 is not limited to worm drive as embodiments of the present invention, and that in other embodiments, a gear drive may be used to rotate the screw 32, for example.
It is to be understood that the number of the fixing holes 432 and the fastening screw holes 414 is not limited to the present embodiment, and may be set according to actual needs.
It will be appreciated that the fastening screw holes 414 may extend in other directions as long as they can be fitted with fastening screws 415 to stably mount the horizontal cross member 43 on the sleeve 41.
The foregoing description is directed to the preferred embodiments of the present invention, but the embodiments are not intended to limit the scope of the invention, and all equivalent changes or modifications made under the technical spirit of the present invention should be construed to fall within the scope of the present invention.
Claims (4)
1. The utility model provides a wind tunnel test wake flow measurement elevating gear, includes base, elevating system and instrument installing support, elevating system installs on the base, in order to drive instrument installing support moves along vertical direction, its characterized in that: the instrument mounting bracket comprises a sleeve and a horizontal cross beam, wherein the sleeve is connected with the lifting mechanism and is horizontally arranged, at least one fastening screw hole is formed in the sleeve, and the fastening screw hole is in threaded connection with a fastening screw; the horizontal cross beam penetrates through the sleeve and is arranged on the sleeve through the fastening screw; the horizontal cross beam is provided with a plurality of fixing holes, a plurality of locking screw holes are formed corresponding to the fixing holes, the fixing holes are arranged at intervals along the length direction of the horizontal cross beam, and each fixing hole vertically penetrates through the horizontal cross beam; each locking screw hole is communicated with the corresponding fixing hole, and each locking screw hole is in threaded connection with a locking screw;
the lifting mechanism comprises a guide frame, a screw rod, a lifting nut, a supporting frame and a driving piece, wherein the guide frame is arranged on the base, the screw rod is rotatably arranged on the base and extends along the vertical direction, and the lifting nut is in threaded connection with the screw rod and is in sliding connection with the guide frame; the supporting frame is fixed on the lifting nut and is connected with the sleeve; the driving piece is arranged on the base and connected with the screw rod to drive the screw rod to rotate;
the base comprises a bottom plate and a containing box fixed on the top surface of the bottom plate, the guide frame is arranged on the containing box, and one end of the screw rod movably penetrates through the containing box and is rotationally connected with the bottom plate; the driving piece comprises a servo driving device, a servo motor and a worm, wherein the servo driving device and the servo motor are arranged on the bottom plate and are connected with each other, the worm is arranged on a motor shaft of the servo motor and is contained in the containing box, a gear is fixedly sleeved on the screw, and the gear is positioned in the containing box and meshed with the worm;
the guide frame comprises a fixed plate and two guide posts, one side of the fixed plate is arranged on the accommodating box, and a mounting hole is formed in the fixed plate in a penetrating manner; one ends of the two guide posts are connected with one side of the fixing plate, which is opposite to the accommodating box, and are respectively positioned at two opposite sides of the mounting hole; the screw rod penetrates through the mounting hole; the lifting nut is positioned between the two guide posts and is in sliding connection with the two guide posts;
the two guide posts are symmetrical upright posts with arc-shaped cross sections, and the outer surface of each guide post is arc-shaped;
the free tail ends of the two guide posts are respectively provided with external threads; the guide frame further comprises a top sleeve, the top sleeve comprises a sleeve body, and an inner thread matched with the outer thread on the guide post for use is arranged on the inner wall of the sleeve body; a bulge is also arranged in the sleeve body, and a sleeve joint space is formed between the bulge and the sleeve body; the bulge is provided with a sleeving hole, and the free tail ends of the two guide posts are inserted into the sleeving space and are in threaded connection with the sleeve body; the free tail end of the screw rod is rotatably inserted into the sleeve joint hole;
a first scale mark and a second scale mark are arranged on the bottom plate, and the first scale mark and the second scale mark are mutually perpendicular;
the lifting nut comprises a nut body and a guide sleeve, the support frame is arranged on the nut body, the nut body is in a cuboid block shape, the side surface of the nut body, which is opposite to the support frame, is an arc surface, the guide sleeve is arranged on the side of the nut body, which is opposite to the base, and the outer diameter of the guide sleeve is smaller than that of the nut body, so that a wire passing space for a cable to pass through is formed between the guide sleeve and the guide pillar; the lifting nut is sleeved on the screw rod through the threaded hole and is in threaded connection with the screw rod, and two opposite sides of the nut body are respectively connected with two guide posts in a sliding manner so as to limit the rotation of the lifting nut through the two guide posts; and the arc-shaped surface of the nut body is connected with a counterweight rod.
2. The wind tunnel test wake measurement lifting device of claim 1, wherein: the fixing holes are uniformly distributed at intervals, and the fixing holes are symmetrically distributed on the horizontal cross beam by taking the middle position of the sleeve as a symmetrical center.
3. The wind tunnel test wake measurement lifting device of claim 2, wherein: the number of the fixing holes is an odd number, a clearance hole is vertically formed in the middle of the sleeve in a penetrating manner, and the clearance hole is aligned with the fixing hole in the center of the horizontal cross beam; a through hole is further formed in the middle of the sleeve so as to allow a locking screw corresponding to a fixing hole in the center of the horizontal cross beam to pass through; the distance between the end part of the sleeve and the middle position of the sleeve is smaller than the distance between two adjacent fixing holes.
4. The wind tunnel test wake measurement lifting device of claim 1, wherein: the outer wall of the screw is provided with a flange, and the flange is rotationally connected with the mounting hole.
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| CN201810839193.8A CN108760229B (en) | 2018-07-27 | 2018-07-27 | Wind tunnel test wake flow measurement lifting device |
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| CN201810839193.8A CN108760229B (en) | 2018-07-27 | 2018-07-27 | Wind tunnel test wake flow measurement lifting device |
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| CN109324203A (en) * | 2018-11-29 | 2019-02-12 | 大连海英科技有限公司 | A kind of lift wind direction and wind velocity measuring instrument and adjusting method |
| CN110987351B (en) * | 2019-12-24 | 2024-06-04 | 西北农林科技大学 | Spatial wind field three-dimensional measurement device and method for orchard sprayer |
| CN115711632A (en) * | 2022-10-19 | 2023-02-24 | 西安京兆电力科技有限公司 | Method for determining data average wind speed value point position in non-uniform wind field air duct cross section |
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