A high-precision calibration mechanism for a three-dimensional complex flow field nine-hole probe

Abstract

The application relates to a high-precision calibration mechanism of a three-dimensional complex flow field nine-hole probe, which is mainly composed of a Y-axis speed reduction turntable assembly, a turntable connecting piece, a Z-axis linear guide rail assembly, a right-angle fixing block, a right-angle fixing block bolt, a rotary table connecting bolt, an X-axis rotary table assembly, a probe fixing sleeve, a fixing sleeve bolt, a jackscrew and a turntable bolt. The Y-axis speed reduction turntable assembly is located at the lower part of the calibration mechanism and is fixedly connected with a wind tunnel outlet platform. The Y-axis speed reduction turntable assembly is fixedly connected with the Z-axis linear guide rail assembly, the Z-axis linear guide rail assembly is fixedly connected with the X-axis rotary table assembly, the probe passes through the probe fixing sleeve, the jackscrew is matched with the probe fixing sleeve, and the probe is fixed. The calibration mechanism can quickly and accurately adjust the positions of different wind pressure gradients of the nine-hole probe and different deflection angles and pitching angles.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of pressure test auxiliary devices, and specifically relates to a high-precision calibration mechanism for a nine-hole probe of a three-dimensional complex flow field. BACKGROUND

[0002] The nine-hole probe is an aerodynamic measuring device for testing the direction, speed, total pressure and static pressure of a non-uniform, large-attack-angle complex three-dimensional flow field, and has high measurement precision and low cost. Before use, the nine-hole probe must be calibrated. The calibration is to place the nine-hole probe in a non-uniform flow field with a known wind speed and direction, measure the pressures of the nine pressure measuring holes of the nine-hole probe at different wind speeds, different wind pressure gradients, different deflection angles and pitch angles, and draw calibration curves such as an angle characteristic curve, a dynamic pressure characteristic curve, a total pressure characteristic curve and a static pressure characteristic curve. When a complex three-dimensional wind field is tested, the pressures of the nine pressure measuring holes can be tested by the non-rotation method, and the wind speed scalar and vector of the three-dimensional wind field can be obtained by querying the calibration curves. Since existing probe calibration mechanisms are mostly used for calibration of three-hole, five-hole and seven-hole probes, they can only measure the pressures of the pressure measuring holes at different deflection angles and pitch angles at a fixed position of the outlet of a calibration wind tunnel, and cannot realize calibration at different wind pressure gradient positions, and are not suitable for calibration of the nine-hole probe of the three-dimensional complex flow field. SUMMARY

[0003] In order to overcome the deficiency that the existing calibration mechanism cannot calibrate the probe at different wind pressure gradient positions, the application provides a high-precision calibration mechanism for a nine-hole probe of a three-dimensional complex flow field.

[0004] The application solves the technical problem by adopting the technical scheme that

[0005] The high-precision calibration mechanism for the nine-hole probe of the three-dimensional complex flow field is mainly composed of a Y-axis speed-reducing turntable assembly, a turntable connecting piece, a Z-axis linear guide rail assembly, a right-angle fixed block, a right-angle fixed block bolt, a rotary table connecting bolt, an X-axis rotary table assembly, a probe fixing sleeve, a fixing sleeve bolt, a jackscrew and a turntable bolt.

[0006] The Y-axis speed-reducing turntable assembly is located at the lower part of the calibration mechanism and is horizontally placed and fixedly connected with an outlet platform of a wind tunnel. The Y-axis speed-reducing turntable assembly is fixedly connected with the Z-axis linear guide rail assembly through the turntable connecting piece, the Z-axis linear guide rail assembly is fixedly connected with the X-axis rotary table assembly through the right-angle fixed block, the probe fixing sleeve is fixedly connected with the X-axis rotary table assembly, the probe passes through the probe fixing sleeve, and the jackscrew is matched with the probe fixing sleeve and used for fixing the probe.

[0007] The probe is a nine-hole probe, that is, a calibration element, which is installed on a calibration mechanism, and the nine-hole probe detects the wind pressure performance parameters of the three-dimensional complex flow field at the outlet of the wind tunnel by adjusting the Y-axis speed reduction turntable assembly, the Z-axis linear guide rail assembly and the X-axis rotary table assembly of the calibration mechanism.

[0008] The Y-axis speed reduction turntable assembly comprises a stepper motor, a shaft coupling and a turntable mechanism. The turntable mechanism comprises a base plate, a turntable, a turntable shaft, a transmission shaft and a transmission gear set. The stepper motor of the Y-axis speed reduction turntable assembly, the turntable shaft and the transmission gear set are connected with the base plate. The turntable is fixedly connected with the turntable shaft and can rotate around the turntable shaft on the upper side of the base plate. The stepper motor of the Y-axis speed reduction turntable assembly is connected with the transmission shaft of the Y-axis speed reduction turntable assembly through the shaft coupling of the Y-axis speed reduction turntable assembly. The transmission shaft is connected with the transmission gear set, and the transmission gear set is connected with the turntable shaft. The turntable shaft is fixedly connected with the turntable. The rotation of the stepper motor of the Y-axis speed reduction turntable assembly drives the shaft coupling, the transmission shaft, the transmission gear set, the turntable shaft and the turntable in sequence, so that the turntable rotates around the turntable shaft under the driving of the rotation of the stepper motor of the Y-axis speed reduction turntable assembly. The turntable connector is fixedly connected with the turntable through the turntable bolt. The base plate of the Y-axis speed reduction turntable assembly is fixedly connected with the outlet platform of the wind tunnel. The base plate remains horizontal.

[0009] The Z-axis linear guide rail assembly comprises a stepper motor, a shaft coupling, a bracket, a screw rod and a sliding block. The stepper motor of the Z-axis linear guide rail assembly is fixedly connected with the bracket. The stepper motor of the Z-axis linear guide rail assembly is fixedly connected with the shaft coupling of the Z-axis linear guide rail assembly. The shaft coupling of the Z-axis linear guide rail assembly is fixedly connected with the screw rod. The stepper motor of the Z-axis linear guide rail assembly drives the screw rod to rotate through the shaft coupling of the Z-axis linear guide rail assembly. The screw rod is connected with the bracket and the sliding block. The rotation of the screw rod can drive the sliding block to move upward or downward along the bracket. The bracket is fixedly connected with the turntable connector. The sliding block is fixedly connected with the right-angle fixed block through the right-angle fixed block bolt.

[0010] The X-axis rotary table assembly is a worm gear rotary table, comprising a housing, a rotary table, a worm gear, a worm, and a stepper motor. The rotary table, the worm gear, and the worm are located on one side of the housing. The worm gear is fixedly connected to the rotary table, and the rotary table can rotate within the housing. The stepper motor of the X-axis rotary table assembly is fixedly connected to the housing, and the output shaft of the stepper motor is fixedly connected to the worm. The rotation of the stepper motor drives the worm to rotate, and the rotation of the worm drives the worm gear. The worm gear and the rotary table rotate together within the housing. The housing and the right-angle fixing block are fixedly connected by the rotary table connecting bolts. The probe fixing sleeve is fixedly connected to the rotary table by fixing sleeve bolts and can rotate with the rotation of the rotary table.

[0011] The high-precision calibration mechanism for the three-dimensional complex flow field nine-hole probe mentioned above has a Y-axis reduction turntable assembly with a turntable surface diameter of 100mm. The turntable side is marked with scales for positioning the rotation angle. The reduction ratio of the reduction turntable is 90:1, which is the ratio of the stepper motor speed of the Y-axis reduction turntable assembly to the turntable speed.

[0012] The turntable is driven by a stepper motor of the Y-axis reduction turntable assembly. With the driver of the stepper motor of the Y-axis reduction turntable assembly and a programmable motion controller, the turntable can be rotated at any angle. The step angle of the stepper motor of the Y-axis reduction turntable assembly is 1.8°, and the turntable resolution of the Y-axis reduction turntable assembly is 0.02°, which means that the horizontal deflection angle of the probe can be accurately controlled.

[0013] The high-precision calibration mechanism for the three-dimensional complex flow field nine-hole probe mentioned above has a 4mm lead ball screw for the Z-axis linear guide assembly and an elastic coupling for the Z-axis linear guide assembly coupling.

[0014] Under the action of the stepper motor driver and programmable controller of the Z-axis linear guide assembly, the slider can move up and down with a positioning accuracy of 0.03mm, which means that the vertical displacement of the probe can be accurately controlled.

[0015] The high-precision calibration mechanism for the nine-hole probe in the three-dimensional complex flow field described above has a worm gear to rotary table transmission ratio of 45:1, that is, a stepper motor to rotary table transmission ratio of 45:1. Under the action of the stepper motor driver and programmable motion controller of the X-axis rotary table assembly, the rotary table rotation resolution is 0.01°, which means that the probe pitch and deflection angle can be accurately controlled.

[0016] The beneficial effects of this invention are:

[0017] The application discloses a high-precision calibration mechanism of a three-dimensional complex flow field nine-hole probe, which can quickly and accurately adjust the position of the nine-hole probe at different wind pressure gradients and different deflection angles and pitching angles during calibration. When gradient flow or oblique flow flows through the head of the probe rod, the position of the nine-hole probe in the calibration wind field can be accurately kept to measure the pressure difference of the windward surface and the leeward surface, so that the measurement precision and efficiency of the nine-hole probe are improved. BRIEF DESCRIPTION OF DRAWINGS

[0018] The application is further described below in combination with the drawings and examples.

[0019] Figure 1 It is a front view of the mechanism of the application.

[0020] Figure 2 It is a right view of the mechanism of the application.

[0021] Figure 3 It is a top view of the mechanism of the application.

[0022] Figure 4a It is a front view of the rotary disc connecting piece.

[0023] Figure 4b It is a top view of the rotary disc connecting piece.

[0024] Figure 5a It is a front view of the right-angle fixing block.

[0025] Figure 5b It is a top view of the right-angle fixing block.

[0026] Figure 6a It is a front view of the probe fixing sleeve.

[0027] Figure 6b It is a top view of the probe fixing sleeve.

[0028] Figure 7a It is a front view of the linear guide rail.

[0029] Figure 7b It is a right view of the linear guide rail.

[0030] In the drawings, 1 is a stepping motor, 2 is a shaft coupling, 3 is a Y-axis speed-reducing rotary disc assembly, 4 is a rotary disc connecting piece, 5 is a Z-axis linear guide rail assembly, 6 is a right-angle fixing block, 7 is a right-angle fixing block bolt, 8 is a rotary table connecting bolt, 9 is an X-axis rotary table assembly, 10 is a probe fixing sleeve, 11 is a fixing sleeve bolt, 12 is a jackscrew, 13 is a rotary disc bolt, and 14 is a probe. DETAILED DESCRIPTION

[0031] Example 1

[0032] A kind of high-precision calibration mechanism of three-dimensional complex flow field nine-hole probe, it is mainly by Y axis speed reducer turntable component 3, turntable connecting piece 4, Z axis linear guide rail component 5, right angle fixed block 6, right angle fixed block bolt 7, rotary table connecting bolt 8, X axis rotary table component 9, probe fixed sleeve 10, fixed sleeve bolt 11, top wire 12, turntable bolt 13, as shown in Fig. Figure 1 As shown in Fig.

[0033] Y axis speed reducer turntable component 3 includes stepper motor 1, shaft coupling 2, turntable mechanism.The turntable mechanism includes chassis, turntable table, box, worm, transmission gear set.

[0034] Z axis linear guide rail component 5 includes stepper motor 1, shaft coupling 2, support, screw rod, ball nut, sliding block.

[0035] X axis rotary table component 9 includes shell, rotary table, worm wheel, worm, stepper motor 1.

[0036] As shown in Fig. Figure 1 Y axis speed reducer turntable component is connected with Z axis linear guide rail component by turntable connecting piece, turntable bolt, and Z axis linear guide rail is perpendicular to Y axis speed reducer turntable table surface.Z axis linear guide rail component is connected with X axis rotary table component by right angle fixed block and right angle fixed block bolt, and the central axis of X axis rotary table component is perpendicular to Z axis linear guide rail.Probe fixed sleeve is connected with X axis rotary table component rotary table by fixed sleeve bolt, and probe fixed sleeve and X axis rotary table component keep the same central axis.Probe is connected with probe fixed sleeve by top wire.

[0037] Y axis speed reducer turntable component stepper motor is two-phase 42-step motor, the size of turntable component table is 100mm, and there is a scale ring on the side of the table to facilitate positioning angle degree, the worm, transmission gear set inside the speed reducer turntable form a speed reducer mechanism, and the speed reduction ratio is 90:1.The rotary table is driven by stepper motor, and the rotary table surface is controlled to rotate at any angle by cooperating with stepper motor driver and programmable motion controller, the step distance angle of stepper motor is 1.8°, and the resolution of Y axis speed reducer turntable can reach 0.02° after speed reduction, so that the accurate angle pitch during probe calibration can be controlled.

[0038] Z axis linear guide rail component stepper motor is two-phase 42-step motor, screw rod is 4mm lead ball screw, ball nut size is φ12mm, sliding block is fixed on ball nut, ball nut cooperates with screw rod, screw rod cooperates with support, and the stroke of Z axis linear guide rail component is 100mm.The sliding block can be displaced up and down by cooperating with stepper motor driver and programmable motion controller, and the positioning accuracy is 0.03mm, so that the accurate up and down displacement during probe calibration can be controlled.

[0039] The X-axis direction is composed of a worm gear rotating table, a stepping motor and a probe fixing sleeve. The transmission ratio of the worm gear rotating table is 45:1. The worm gear rotating table is connected to the linear guide rail slider through a right-angle fixing block. The stepping motor is connected to the worm shaft. The probe fixing sleeve is fixed to the rotating table surface. The nine-hole probe is connected to the probe fixing sleeve through a jack. The assembly can realize the rotation of the rotating table at a resolution of 0.01° and accurately control the deflection of the probe during calibration in cooperation with the stepping motor driver and the programmable motion controller.

Claims

1. A high-precision calibration mechanism for a three-dimensional complex flow field nine-hole probe, characterized in that, Mainly by Y axis deceleration turntable assembly (3), turntable connecting piece (4), Z axis linear guide rail assembly (5), right angle fixed block (6), right angle fixed block bolt (7), rotary table connecting bolt (8), X axis rotary table assembly (9), probe fixing sleeve (10), fixed sleeve bolt (11), jackscrew (12), turntable bolt (13) are composed of; The Y axis deceleration turntable assembly (3) is located in the lower part of the calibration mechanism, and is horizontally placed and fixedly connected with the wind tunnel outlet platform;The Y axis deceleration turntable assembly (3) is fixedly connected with the Z axis linear guide rail assembly (5) through the turntable connecting piece (4), the Z axis linear guide rail assembly (5) is fixedly connected with the X axis rotary table assembly (9) through the right angle fixed block (6), the probe fixing sleeve (10) is fixedly connected with the X axis rotary table assembly (9) through the fixed sleeve bolt (11), and the probe (14) passes through the probe fixing sleeve (10), the jackscrew (12) is matched with the probe fixing sleeve (10), and is used for fixing the probe (14); The probe (14) is a nine-hole probe, that is, a calibration piece, which is installed on the calibration mechanism, and the nine-hole probe detects the wind pressure performance parameters of the three-dimensional complex flow field of the wind tunnel outlet by adjusting the Y axis deceleration turntable assembly (3), the Z axis linear guide rail assembly (5) and the X axis rotary table assembly (9) of the calibration mechanism; The Y axis deceleration turntable assembly (3) includes a stepping motor (1), a shaft coupling (2) and a turntable mechanism;The turntable mechanism includes a bottom disc, a turntable, a turntable shaft, a transmission shaft and a transmission gear set;The stepping motor (1) of the Y axis deceleration turntable assembly (3), the turntable shaft and the transmission gear set are connected with the bottom disc, the turntable is fixedly connected with the turntable shaft, the turntable can rotate around the turntable shaft on the upper side of the bottom disc, the stepping motor (1) of the Y axis deceleration turntable assembly (3) is connected with the transmission shaft of the Y axis deceleration turntable assembly (3) through the shaft coupling (2) of the Y axis deceleration turntable assembly (3), the transmission shaft is connected with the transmission gear set, the transmission gear set is connected with the turntable shaft, and the turntable shaft is fixedly connected with the turntable;The rotation of the stepping motor (1) of the Y axis deceleration turntable assembly (3) drives the shaft coupling (2), the transmission shaft, the transmission gear set, the turntable shaft and the turntable of the Y axis deceleration turntable assembly (3) in sequence, so that the turntable rotates around the turntable shaft under the rotation driving of the stepping motor (1) of the Y axis deceleration turntable assembly (3);The turntable connecting piece (4) is fixedly connected with the turntable through the turntable bolt (13), the bottom disc of the Y axis deceleration turntable assembly (3) is fixedly connected with the wind tunnel outlet platform, and the bottom disc remains horizontal; The Z-axis linear guide rail assembly (5) includes a stepping motor (1), a shaft coupling (2), a support, a screw rod and a sliding block. The stepping motor (1) of the Z-axis linear guide rail assembly (5) is fixedly connected with the support. The stepping motor (1) of the Z-axis linear guide rail assembly (5) is fixedly connected with the shaft coupling (2) of the Z-axis linear guide rail assembly (5). The shaft coupling (2) of the Z-axis linear guide rail assembly (5) is fixedly connected with the screw rod. The stepping motor (1) of the Z-axis linear guide rail assembly (5) drives the screw rod to rotate through the shaft coupling (2) of the Z-axis linear guide rail assembly (5). The screw rod is connected with the support and the sliding block. The rotation of the screw rod can drive the sliding block to move upwards or downwards along the support. The rotary disc connector (4) is fixedly connected with the support. The right-angle fixed block (6) is fixedly connected with the sliding block through the right-angle fixed block bolt (7). The X-axis rotary table assembly (9) is a worm gear rotary table, which includes a housing, a rotary table, a worm wheel, a worm, and a stepping motor (1). The rotary table, the worm wheel and the worm are located in one side of the housing. The worm wheel is fixedly connected with the rotary table. The rotary table can rotate in the housing. The stepping motor (1) of the X-axis rotary table assembly (9) is fixedly connected with the housing. The output shaft of the stepping motor (1) of the X-axis rotary table assembly (9) is fixedly connected with the worm. The rotation of the stepping motor (1) of the X-axis rotary table assembly (9) drives the worm to rotate. The rotation of the worm drives the worm wheel. The worm wheel rotates in the housing together with the rotary table. The housing is fixedly connected with the right-angle fixed block (6) through the rotary table connecting bolt (8). The probe fixing sleeve (10) is fixedly connected with the rotary table through the fixing sleeve bolt (11) and can rotate with the rotary table. The rotary disc table of the Y-axis speed reduction rotary disc assembly (3) has a diameter of 100 mm. The side of the rotary disc is provided with a scale for positioning the rotation angle. The speed reduction ratio of the speed reduction rotary disc is 90:1, which is the ratio of the rotation speed of the stepping motor (1) of the Y-axis speed reduction rotary disc assembly (3) to the rotation speed of the rotary disc. The rotary disc is driven by the stepping motor (1) of the Y-axis speed reduction rotary disc assembly (3). The driver of the stepping motor (1) of the Y-axis speed reduction rotary disc assembly (3) and the programmable motion controller realize the arbitrary angle rotation control of the rotary disc. The step angle of the stepping motor (1) of the Y-axis speed reduction rotary disc assembly (3) is 1.8°. The resolution of the rotary disc of the Y-axis speed reduction rotary disc assembly (3) is 0.02°, which can accurately control the horizontal deflection angle of the probe (14). The screw rod of the Z-axis linear guide rail assembly (5) is a 4 mm lead ball screw. The shaft coupling (2) of the Z-axis linear guide rail assembly (5) is a flexible shaft coupling. Under the action of the driver of the stepping motor (1) of the Z-axis linear guide rail assembly (5) and the programmable motion controller, the sliding block moves up and down. The positioning accuracy of the displacement is 0.03 mm, which can accurately control the up and down displacement of the probe (14).

2. The high-precision calibration mechanism of a three-dimensional complex flow field nine-hole probe according to claim 1, characterized in that, The worm and the swivel table transmission ratio of the X-axis swivel table assembly (9) is 45:1, that is, the step motor (1) of the X-axis swivel table assembly (9) and the swivel table transmission ratio is 45:1, under the action of the driver of the step motor (1) of the X-axis swivel table assembly (9) and the programmable motion controller, the resolution of the swivel table rotation is 0.01°, that is, the pitch deflection angle of the probe (14) can be accurately controlled.

Images