JP2002022758A - Tare type wind channel device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To accurately calibrate and adjust a wind speed sensor in a low wind speed region with relatively simple constitution. SOLUTION: A rotating drum 4 is rotatably held to a frame. A plurality of radial tares are formed at constant spaces at the outer peripheral part of the rotating drum 4. A measuring wind speed sensor 22 is fitted piercing a slit of the rotating drum 4 from the outside to project into the tare. When the rotating drum 4 is rotated in the fixed state of the measuring wind speed sensor 22, the tares 16 move at specified speed together with the rotating drum 4, so that wind speed can be calibrated from the speed of the center part.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a tare type wind tunnel device for calibrating and adjusting a wind speed sensor.

[0002]

2. Description of the Related Art Various anemometers are widely used as wind speed sensors for measuring wind speed. For example, in a hot wire anemometer, a hot wire such as platinum is heated to a predetermined temperature as a part of a bridge circuit, and a wind speed is measured based on a change in resistance value when the platinum wire is placed in a wind speed measuring environment.

In order to accurately calibrate such a wind speed sensor, a wind speed sensor is arranged in a wind tunnel in which an arbitrary wind speed can be set and calibrated. There is also known a method of performing calibration by moving a bogie or the like equipped with a wind speed sensor at a constant speed in a space such as a tunnel where no flow occurs.

[0004]

However, calibration using a wind tunnel has a drawback in that it is difficult to obtain an accurate wind speed especially in a low wind speed region, and calibration is difficult. In addition, the calibration method using a tunnel has the disadvantage that the calibration work is extremely large and requires a large amount of cost and labor.

In particular, a wind speed sensor for measuring the indoor environment is required to accurately measure a low wind speed range and to have no directivity. The conventional calibration device has a drawback that it is difficult to measure a low wind speed range and a directivity.

SUMMARY OF THE INVENTION The present invention has been made in view of the above-mentioned conventional problems, and has a relatively simple structure and can easily calibrate a wind speed sensor in a low wind speed region without requiring large-scale equipment. It is an object of the present invention to provide a tare type wind tunnel device capable of easily confirming directional characteristics.

[0007]

According to a first aspect of the present invention, there is provided a rotary drum rotatably mounted on a frame along a rotation axis thereof, and rotating the rotary drum at a constant speed along the rotation axis thereof. A rotary drive means for driving; and a sensor holding portion fixedly attached to the frame and holding a measuring wind speed sensor inserted into the rotary drum, wherein the rotary drum includes a first disk. A second disk coaxially arranged at a predetermined distance from the first disk and having a slit formed at a predetermined radial position over the entire circumference; and a first disk and a second disk. An annular inner peripheral plate annularly mounted at a predetermined radial position, an annular outer peripheral plate covering an outer peripheral portion of the first and second disks, and a connection with the first and second disks. And a region formed by the first and second disks, the inner peripheral plate, and the outer peripheral plate. It is characterized in that it comprises a partition plate forming a plurality of tare partitions the radial shape at a constant angle each, a.

According to a second aspect of the present invention, in the tare type wind tunnel apparatus of the first aspect, the slit is provided with two annular elastic members having a cut in the center, and the slit covers the slit. This is a feature of the present invention.

The invention of claim 3 of the present application is directed to claim 1 or 2
In the tare type wind tunnel device of the above, the tare type wind tunnel device may be configured to move the rotating drum at least ± 90 around a vertical direction.
And a tilt holding mechanism for holding the frame at an angle in the range of °.

According to a fourth aspect of the present invention, there is provided a tare type wind tunnel apparatus according to any one of the first to third aspects, wherein the tare type wind tunnel apparatus includes a tare wind speed sensor fixed to a tare in a rotary drum. It is further characterized by having.

According to a fifth aspect of the present invention, in the tare type wind tunnel apparatus according to any one of the first to fourth aspects, the partition plate is formed of a member having a mesh structure. .

[0012]

1 and 2 are a front view and a side view showing a structure of a tare type wind tunnel device according to an embodiment of the present invention. The tare type calibration wind tunnel according to the present embodiment has a gantry 1 and a horizontal rotating gantry 2 as frames. Stand 1
Consists of a frame 1a with a caster 3 attached to the bottom part, and a pair of vertical parts 1b and 1c on both sides.
It is configured to be movable. The horizontal rotating base 2 has a vertical portion 1b,
1c is a frame attached to the upper end of the
Are held so as to be rotatable around a rotation shaft 4a in the longitudinal direction. As shown in the figure, the horizontal rotating gantry 2 holds the rotating drum 4 rotatably inside its frame around its rotating shaft 4b. A variable-speed driving motor 5 is mounted on the horizontal rotating base 2, and a driving belt 6 is stretched between the motor 5 and the outer peripheral portion of the rotating drum 4 to rotate the rotating drum 4 at a constant speed. Like that.

FIG. 3A is a sectional view of the rotary drum 4.
As shown in the side views from both sides in (b) and (c), a first disk 11 constituting the A surface, a second disk 12 having substantially the same diameter constituting the B surface, and An annular inner peripheral plate 13 and an outer peripheral plate 14 having a constant radius and held at a constant interval are provided. Both the inner peripheral plate 13 and the outer peripheral plate 14 are made of a transparent acrylic plate or the like. Inner peripheral plate 1 of this rotating drum 4
3, a partition plate 15 is provided between the outer peripheral plate 14 to partition an annular region surrounded by the inner peripheral plate 13 and the outer peripheral plate 14 in the radial direction as shown in FIG. The partition plate 15 divides the annular region of the rotary drum 4 at an equal angle, and each divided region is referred to as a tare 16. In this case, 24 tares 16 are constituted by the 24 partition plates 15. As shown in FIG. 4, most of the center of the partition plate 15 is formed of a mesh. An opening 17a parallel to the rotating shaft 4b of the rotating drum 4 is provided at the center thereof, and a slit 17b directed to the second disk 12 and connected to the opening 17a is provided.

The first disk 11 is a single disk made of a honeycomb panel or the like, and has a groove 11a for the drive belt 6 formed on the outer periphery as shown in FIG. The second disk 12 includes an inner peripheral portion 12a and an outer peripheral portion 12b, and a narrow slit 12c is formed at an intermediate portion. Also this slit 1
2c, two annular elastic members, for example, rubber 18
a and 18b are attached from the inner peripheral portion 12a and the outer peripheral portion 12b. Rubbers 18a and 18b have slits 1 at their ends.
The slit 12c is sealed by making contact at the center of 2c.

Further, as shown in FIG.
A semicircular inclination angle fixing plate 19 is attached to one of the vertical portions 1c. The inclination angle fixing plate 19 has a constant radius of 180 ° around the rotational axis 4a of the rotary drum 4 in the diameter direction.
Is formed. Tilt angle fixing plate 1
Reference numeral 9 denotes a rotating shaft 4 from the vertical position of the rotating drum 4 shown in FIG.
a member for fixing the rotating drum 4 at any angle within a range of ± 90 ° around a,
Rotating drum 4 at an angle set through slit 19a
Is mounted on the vertical portion 1c of the gantry 1. The inclination angle fixing plate 19 and the horizontal axis stopper 20 constitute an inclination holding mechanism.

A wind speed sensor holding section 21 is provided on the horizontal rotating base 2. The wind speed sensor holding unit 21 includes a cover 21a that is close to and parallel to the second disk 12 of the rotary drum 4, and holds the wind speed sensor 22 to be measured. The measurement wind speed sensor 22 is protruded into the tare 16 through the slit 12c of the second disk 12 and the slit 17b of the partition plate 15, so that the center of the sensor portion is substantially equal to the center of the opening 17a of the partition plate. It is fixed so that it becomes. The wind speed sensor holder 21 has rubbers 18a, 18b.
Is provided only at the position of the wind speed sensor holding portion 21. A main body of a wind speed measuring device (not shown) is connected to the measuring wind speed sensor 22 at an arbitrary position by a cable or the like.

Further, the first disk 11 is attached to any of the tare 16.
Is inserted into the tare from the outer periphery toward the inside of the tare, and is fixed. The in-tare wind speed sensor 24 is mounted at a position that does not interfere with the measurement wind speed sensor 22, and rotates with the rotation of the rotating drum 4. Tare air speed sensor 24
The line of the power supply to the power supply and the signal output from the in-tare wind speed sensor 24 is guided from the inside of the tare to the rotating shaft 4 b through the inner peripheral portion of the rotating drum 4, as shown in FIG. It is electrically connected to the outside.

Further, a rotary encoder 2 for detecting the number of rotations of the rotary drum 4 is provided on a rotary shaft 4b of the rotary drum 4.
6 is connected. The output of the rotary encoder 26 is connected to the controller 30.

FIG. 5 is a block diagram showing a configuration of the controller 30 of the tare type wind tunnel apparatus according to the present embodiment. In the figure, the controller 30 also has a rotation speed setting unit 31 for setting the rotation speed of the rotary drum 4, a rotation speed set based on the rotation speed obtained from the rotary encoder 26 and the rotation speed set by the rotation speed setting unit. A rotation speed control unit 32 for controlling the rotation speed of the motor 5, a motor driver 33 for driving the motor 5 so that the rotation speed becomes the set rotation speed, and a rotation speed display unit 34 for displaying the rotation speed obtained from the rotary encoder 26. . Furthermore, a tare-internal-air-speed measuring unit 35 connected to the tare-internal-air-speed sensor 24 via a slip ring 25 and measuring the wind speed in the tare, and a tare-internal-air-speed display unit 36 for displaying the measured wind speed in the tare are provided. .

Next, the operation of this embodiment will be described. First, the rotary drum 4 is fixed at a predetermined angle, for example, in the vertical direction as shown in FIGS. 1 and 2 by using the inclination angle fixing plate 19 and the horizontal shaft stopper 20. Wind speed sensor holder 21
The measurement wind speed sensor 22 is connected to the slit 1 of the partition plate 15.
7b so that it projects into the tare and is fixed. At this time, the rotating drum 4 rotates clockwise in the case of FIG.
Wind in the vertical direction at that measurement position (down blow)
Is generated, and the measurement direction of the measurement wind speed sensor 22 is set as the vertical direction. Then the controller 30
The rotation speed to be set is set in the rotation speed setting unit 31 of. The rotation radius from the center of the rotation shaft 4b of the rotation drum 4 to the position of the measurement wind speed sensor 22 is a value determined at the time of design, and the circumference length for one rotation can be calculated. Then, the wind speed value can be easily calculated by multiplying the circumferential length (m) by the rotation speed (rps) of the rotary drum 4. Therefore, the rotation speed of the motor 5 is set in consideration of the reduction ratio according to the wind speed value to be measured.

Next, when the operation is started, the rotating drum 4 is rotated by the motor 5, and the rotation speed control unit 32 controls the motor 5 to a predetermined rotation speed. In this state, the wind speed value from the in-tare wind speed sensor 24 is confirmed. To perform an accurate measurement, the wind speed in the tare is required to be zero. However, immediately after the rotation starts, the recirculation occurs in the rotating drum 4, and after a predetermined time, the wind speed in the tare becomes zero. Approaching. Therefore, after the rotation is started, for example, after a lapse of several minutes, the display of the in-tare wind speed display section 36 is checked. If the display of the wind speed in the tare is zero, it can be confirmed that there is no air flow in the tare associated with the rotation of the rotary drum 4 inside each tare of the rotary drum 4. In this state, calibration is performed by referring to an instruction from a wind speed measurement unit (not shown) based on a signal from the measurement wind speed sensor 22 to be measured. The wind speed sensor can be calibrated to an accurate value by adjusting the measurement wind speed sensor 22 so that the wind speed value thus calculated becomes the calculated wind speed value. In particular, in the present embodiment, a stable wind speed can be obtained from a low wind speed range of about 0.05 m / s by controlling the rotation speed of the motor 5. Therefore, the tare type wind tunnel device according to the present invention is particularly suitable as a calibration device in a low wind speed range of 0.05 m / s to 1 m / s.

It is preferable that the indoor wind speed sensor used in such a low wind speed region is non-directional.
Therefore, the mounting direction when the measuring wind speed sensor 22 to be inserted into the tare is vertically mounted on the second disk 12 is changed along the axis parallel to the rotating shaft 4b, for example, by changing the mounting direction by 15 °. Is repeated, the horizontal directivity characteristics of the measurement wind speed sensor 22 can be measured. Further, even if the rotating drum 4 rotates from the direction perpendicular to the surface of the second disk 12, the measuring wind speed sensor 22 is tilted within the plane parallel to the rotating shaft 4b and within the range of the slit 17b so as not to interfere. And attach it. Then, by gradually changing the mounting angle, the vertical directivity characteristics of the wind speed sensor can be measured.

Further, when the rotation angle of the rotary drum 4 itself is changed from the vertical direction shown in FIGS. 1 and 2 to, for example, the horizontal direction, when a hot wire type wind speed sensor is used, the heating accompanying the heat generation is performed. It is possible to measure the influence of the rise in the air that has been taken on the measurement. As described above, by using the tare type wind tunnel device according to the present invention, the horizontal directivity characteristics, the vertical directivity characteristics, and other characteristics of the wind speed sensor can be measured. Therefore, it can be used as a measurement device for research and development of a wind speed sensor.

In this embodiment, each partition plate has an opening having a large diameter at the position of the wind speed sensor, but this reduces fluctuations when the partition plate passes through the position of the wind speed sensor. If the size of the opening is increased, the measured value of the wind speed sensor does not become zero. If the measured value is too small, pulsation occurs in the output of the wind speed sensor every time the partition plate constituting the tare passes. In addition, mesh is used for each partition plate in order to make all the inside of the tare a steady state in a short time, but when using this tare type calibration wind tunnel in a sufficiently stabilized state, it is not necessary to use a mesh. Instead, a flat plate having the openings 17a and the slits 17b can be used as the partition plate.

[0025]

As described in detail above, according to the first to fifth aspects of the present invention, it is possible to easily calibrate the wind speed sensor with a relatively simple device. In particular, in the present invention, calibration in a low wind speed region can be accurately performed. Further, by changing the mounting angle of the wind speed sensor, the directional characteristics of the wind speed sensor can be measured.

According to the invention of claim 3 of the present application, it is possible to inspect and calibrate the wind speed sensor in various states by changing the rotation angle of the rotating drum.

According to the invention of claim 4 of the present application, by using the in-tare air velocity sensor, it is possible to recognize that the reflux in the tare does not occur. It can be carried out.

According to the invention of claim 5 of the present application, since the partition plate has a mesh structure, after rotating the partition plate in a relatively short time, it is possible to eliminate reflux in each tare.

[Brief description of the drawings]

FIG. 1 is a front view of a tare type wind tunnel device according to an embodiment of the present invention.

FIG. 2 is a side view of the tare type wind tunnel device according to the present embodiment.

FIG. 3 is a cross-sectional view and a side view showing a structure of a rotating drum of the tare type wind tunnel device according to the present embodiment.

FIG. 4 is a sectional view showing an internal structure of a rotary drum of the tare type wind tunnel device according to the present embodiment.

FIG. 5 is a block diagram showing a configuration of a controller of the tare type wind tunnel device according to the present embodiment.

[Explanation of symbols]

 Reference Signs List 1 base 2 horizontal rotating base 3 caster 4 rotating drum 4a rotating shaft 4b rotating shaft 5 motor 6 drive belt 11 first disk 12 second disk 13 inner peripheral plate 14 outer peripheral plate 15 partition plate 16 tare 17a opening 17b Slits 18a, 18b Rubber 19 Inclination angle fixing plate 20 Horizontal axis stopper 21 Wind speed sensor holding unit 22 Measurement wind speed sensor 24 Tare air speed sensor 25 Slip ring 26 Rotary encoder 30 Controller 31 Rotation speed setting unit 32 Rotation speed control unit 33 Motor driver 34 Rotation speed display section 35 Tare wind speed setting section 36 Tare wind speed display section

Claims (5)

[Claims] A rotating drum rotatably mounted on a frame along a rotation axis thereof; a rotation driving means for rotating the rotation drum at a constant speed along the rotation axis; And a sensor holding unit for holding a measurement wind speed sensor inserted into the rotary drum, wherein the rotary drum has a first disk, and a predetermined distance from the first disk. Are arranged coaxially,
A second disk having a slit formed over the entire circumference at a predetermined radial position; an annular inner peripheral plate annularly mounted at a predetermined radial position of the first and second disks; An annular outer peripheral plate that covers the outer peripheral portion of the first and second disks; and an annular outer plate connected to the first and second disks, the first and second disks and the inner and outer peripheral plates. And a partition plate for radially partitioning the region defined by the above at a predetermined angle to form a plurality of tares. 2. A tare type wind tunnel according to claim 1, wherein the slit is provided with two annular elastic members having a notch at a center portion, and the slit is covered by the elastic members. apparatus. 3. The tare-type wind tunnel device further includes an inclination holding mechanism that holds the rotary drum on the frame in a state where the rotary drum is inclined at least within a range of ± 90 ° about a vertical direction. 3. A tare-type wind tunnel device according to 1 or 2. 4. The tare type wind tunnel device according to claim 1, wherein the tare type wind tunnel device further includes an in-tare wind speed sensor fixed to a tare in a rotary drum. 5. The tare type wind tunnel device according to claim 1, wherein the partition plate is formed of a member having a mesh structure.