JPH08189934A - Air current measuring instrument - Google Patents

Abstract

PURPOSE: To obtain an air current measuring instrument which can easily, efficiently, and accurately measure the flowing state of an air current without disturbing the air current. CONSTITUTION: An air current measuring instrument is provided with an air flow indicating string 11 which is hung from a supporting device 4 to which one end of the string 11 is connected and the other end of which indicates the flowing state of the air current, because the end moves in accordance with the flowing state of the air current, and a radial and roughly circular-arcuate angle scale 2 for angle provided near the front end 11a of the string 11, annular azimuth scale, and reference point 10 at the center of the scales.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an air flow measuring device for measuring the flow direction of an air flow in a vertical laminar flow type clean room or the like.

[0002]

2. Description of the Related Art FIG. 3 is a side view showing a conventional air flow measuring means in a clean room. The thread A is hung from a predetermined position on the ceiling surface, and the inclination angle of A deflected by the blowing laminar flow with respect to the vertical line is measured at a position above the floor surface. As shown in FIG. 3, one worker uses a stepladder to lower the thread A from the ceiling, and the other worker holds a scale B and holds it horizontally at a predetermined height above the floor. The amount of movement of the lower thread A from the position inclining due to uneven flow, that is, the position along the line C is measured with a scale B, and the other one records the measured value, and the measured value is used as a parameter for the downward laminar flow. Measure the airflow angle. The measuring means is as shown in FIG.

In the above-mentioned conventional means, a plurality of workers need to work with a lot of labor and troublesome work, resulting in poor work efficiency and when measuring the moving amount of the yarn A with the measuring scale B. ,
Since the worker approaches the yarn A, the air flow is disturbed, resulting in a problem that accurate measurement cannot be performed.

[0004]

SUMMARY OF THE INVENTION The present invention has been made to solve the above-mentioned problems, and can easily measure the flow direction of an air flow, has good working efficiency, and provides accurate measurement without disturbing the air flow. The object is to obtain an air flow measuring device capable of

[0005]

According to a first aspect of the present invention, there is provided an air flow measuring device, wherein a supporting device which can be installed at a position where air flow measurement is to be performed, and one end of which is connected to the supporting device and hangs down from the supporting device. An airflow indicator thread that moves in accordance with the airflow indicator and a tip of the airflow indicator thread that is supported by a supporting device is provided close to and substantially along the trajectory of the movement according to the airflow indicator, It has a reference point vertically below one end connected to the device for supporting the air flow indicator thread, and is provided with a measuring instrument capable of measuring the position of the tip of the air flow indicator thread with respect to the reference point. An angle scale that indicates the amount of movement with respect to the reference point as an angle with respect to the vertical direction of the airflow display thread and an azimuth scale that indicates the movement direction of the tip of the airflow display thread with respect to the reference point are provided.

In the air flow measuring device according to the second aspect of the present invention, the measuring device includes a plurality of radial bodies extending radially from the reference point and a plurality of annular members arranged concentrically with respect to the reference point and fixed to the radial member. The body has a radial scale with an angular scale and an azimuth scale with an annular body.

In the air flow measuring device according to the third aspect, the plumb bob is provided so as to hang down from the reference point of the measuring instrument.

In the airflow measuring device according to the fourth aspect of the invention, there is provided a level for displaying the attitude of the airflow measuring device.

In the airflow measuring device according to the fifth aspect of the invention, there is provided an adjusting device which is provided on the supporting device and which adjusts the attitude of the airflow measuring device.

In the airflow measuring device according to the sixth aspect, a height adjusting device for adjusting the height of the supporting device is provided so that the height of one end of the airflow indicating thread can be adjusted.

[0011]

In the air flow measuring device according to the present invention, since the measuring instrument having the angle scale and the azimuth scale is provided along the trajectory of the tip of the air flow indicating thread, the moving angle of the tip of the air flow indicating thread is set. And azimuth are displayed on the scale of the measuring instrument.

In the air flow measuring device according to the second aspect of the present invention, the measuring instrument comprises a radial body having an angular scale and an annular body having an azimuth scale.

In the airflow measuring device according to the third aspect, the reference point of the airflow measuring device is accurately displayed by swinging down.

In the airflow measuring device according to the fourth aspect, the attitude of the airflow measuring device is displayed by the level.

In the airflow measuring device according to the fifth aspect, the attitude of the airflow measuring device is adjusted by the adjusting device.

In the airflow measuring device according to the sixth aspect, the height of the airflow measuring device can be adjusted by the height adjusting device.

[0017]

【Example】

Example 1. FIG. 1 is a schematic view when airflow measurement in a clean room is performed by the airflow measurement device of the present invention, and FIG. 2 is a perspective view of the airflow measurement device. In FIG. 2, the frame 1, which is a radial body of wire curved in an arc shape, has two curved parts facing downward and intersects each other at right angles to each other and is welded. Two
The points where the books intersect form a reference point 10. In addition, the ring 2 which is a plurality of annular bodies whose diameter gradually increases
Are arranged concentrically around the reference point 10 on the frame 1 and are welded to the frame 1, respectively.

The outermost ring 2a among the plurality of rings 2 is provided with azimuth marks 2b at equal intervals on the circumference. Further, an orientation reference point 9 is provided on the ring 2a. In addition, three support columns 3 provided with an adjuster 6 as an adjusting device at the lower end are fixed to the lower side of the outermost ring 2a at equal intervals, and a measuring device 20 including a frame 1 and a plurality of rings 2 is installed from the floor surface. It is supported horizontally.

One of the three columns 3 is provided with an L-shaped column 4 which is a supporting device connected from the upper end thereof and extends upward. Further, a length adjusting mechanism 4b is provided on the vertical portion of the L-shaped support 4. Adjustment mechanism 4b
The shaft part has a nesting structure and is expandable / contractible, and has a structure that can be locked for a predetermined length so as not to fall due to gravity. The L-shaped support 4 is bent upward in the upward direction of the measuring device 20 to form an L-shape. L-shaped support 4
The tip 4a of the above reaches the reference point 10 of the measuring device 20. One end of the airflow indicator thread 11 is connected to the tip 4a and hangs down from that position.
Indicates a reference point 10 if it hangs vertically downward from the tip 4a of the L-shaped support column 4 in a windless state. L-shaped support 4
A spirit level 5 is provided outside the connecting portion between the column 3 and the column 3. Further, a plumb bob 7 is tied to the back side of the reference point 10 of the measuring instrument 20 and hangs down.

The frame 1 and the plurality of rings 2 forming the measuring device 20 are in a substantially spherical surface having a radius of the length of the airflow indicating thread 11 and are in the shape of a bowl-shaped net as a whole.
Further, the plurality of concentrically arranged rings 2 are arranged so that the intervals between the respective rings are substantially equal to each other, and each ring 2 has a diameter corresponding to each angle so as to indicate an inclination angle of the airflow indicating thread 11 with respect to the vertical. However, the ring 2 itself forms an angular scale that concentrically scales around the reference point 10. Further, the tip 11a of the airflow indicator thread 11 is close to the frame 1 and the ring 2, and the airflow indicator thread 1
When 1 is tilted by the air flow, its tip 11a moves along the frame 1 and the ring 2, and the positional relationship between the two can be directly observed. The ring 2 may be painted according to the angle so that the angle can be easily confirmed from a distant position.

A method of determining the flow direction of the air flow using the air flow measuring device configured as described above will be described. The entire FIG. 2 represents a vertical laminar flow type clean room, in which air having a higher degree of cleanliness than the filter 30a provided on the entire ceiling 30 flows out,
In addition, it is a space that flows out from the entire floor (not shown). Air is flowing almost vertically. The plumb bob 7 is aligned with the mark provided on the floor at the desired measurement position for measuring the airflow condition in the clean room. After that, the leveling device 5 and the adjuster 6 level the measuring device 20. If the measuring device 20 is held horizontally, the reference point 10 is not displaced. That is,
The 10 reference points are vertically below the tip 4a of the L-shaped support column 4 to which the upper end of the airflow indicating thread 11 is fixed. Next, the measuring instrument 20 is rotated so that the azimuth reference point 9 is located in an arbitrary reference direction of the clean room. Then, the L-shaped support 4 is extended to a height approaching the ceiling 30.

The airflow indicator thread 11 flutters by the air blown from the ceiling and tilts at a certain angle, and the positional relationship between the tip 11a of the airflow indicator thread 11 and the ring 2 is visually checked to determine whether the airflow angle is acceptable or not. The direction of flow is measured by reading the azimuth scale 2b. In a vertical laminar flow type clean room, it is ideal that the flow direction is vertical, but in general, if the inclination angle is within 10 degrees, there is no problem in use and it is acceptable.

When the acceptance / rejection angle is determined in advance by the company standard or the like, the outermost ring 2a is set to have a diameter corresponding to the angle (standardized ring), and the tip 11a of the airflow indicating thread 11 is the standard. If it is set so that it will be rejected when it is located outside the ring, work efficiency can be improved by immediately recognizing the pass / fail judgment. Further, since the operator can visually check whether or not the flow direction is passing or the degree of the flow direction at a position distant from the measuring device 20, accurate measurement can be performed without disturbing the air flow near the measuring device 20.

The measuring device 20 formed from the frame 1 and the ring 2 is not limited in size, but different sizes are prepared depending on the height of the ceiling of the clean room and the length of the airflow indicating thread 11. Also, there is no limitation on how to set the azimuth scale 2b, for example, north, south, east, west, or X ...
It may be X, Y, -Y, or the like.

[0025]

According to the airflow measuring device of the present invention, the position of the tip of the airflow indicating thread can be easily and accurately measured by a measuring instrument, and the angle scale indicates the movement amount of the tip of the airflow indicating thread. Since, the angle measurement is made direct.

In the air flow measuring device of the second aspect, since the measuring device is composed of the radial body and the annular body, the structure of the measuring device is simple, and the air flow is not obstructed, and accurate measurement is possible. . Further, the radial body and the annular body themselves can be used as an azimuth scale and an angle scale or a standard ring, respectively.

In the air flow measuring device of the third aspect, since the reference point is displayed by swinging down, the air flow measuring device can be accurately installed at the position where the air flow measurement should be performed.

In the airflow measuring device according to the fourth aspect, the airflow measuring device can be properly positioned while looking at the level to improve the airflow measuring accuracy.

In the air flow measuring device of the fifth aspect, the attitude of the air flow measuring device can be easily and accurately adjusted by the adjusting device.

In the airflow measuring device of the sixth aspect, the height of the supporting device of the airflow measuring device can be easily adjusted by the height adjusting device, and it can be appropriately applied to a clean room having different ceiling heights.

[Brief description of drawings]

FIG. 1 is a schematic view of an air flow measurement device of the present invention when air flow measurement is performed in a clean room.

FIG. 2 is a perspective view of an airflow measuring device.

FIG. 3 is a side view showing a conventional air flow measuring means in a clean room.

FIG. 4 is a schematic diagram of a conventional measuring means.

[Explanation of symbols]

1 frame (radial body), 2 ring (annular body and angular scale), 2b azimuth scale, 4 L-shaped support (supporting device), 5 level, 6 adjuster (adjusting device), 7
Plumb bob, 10 reference point, 11 air flow display thread, 20
Measuring instrument.

Claims (6)

[Claims] 1. A support device that can be installed at a position where air flow measurement is to be performed, and an air flow display thread that has one end connected to the support device and hangs down from the support device and whose tip moves according to the air flow condition to indicate the air flow condition. Provided near the trajectory of the movement of the tip of the airflow indicating thread supported by the supporting device and substantially along the trajectory and connecting to the supporting device of the airflow indicating thread. And a measuring device having a reference point vertically below the one end of the airflow indicating yarn, the measuring device being capable of measuring the position of the tip of the airflow indicating yarn with respect to the reference point. An airflow measuring device comprising: an angle scale that represents a movement amount as an angle with respect to a vertical direction of the airflow display yarn; and an azimuth scale that represents a moving direction of a tip of the airflow display yarn with respect to the reference point. 2. The measuring instrument comprises a plurality of radial bodies extending radially from the reference point, and a plurality of annular bodies arranged concentrically with respect to the reference point and fixed to the radial member. The airflow measuring device according to claim 1, wherein the angular scales are radially attached, and the azimuth scale is attached to the annular body. 3. The airflow measuring device according to claim 1, further comprising a plumb bob hanging from the reference point of the measuring instrument. 4. The airflow measuring device according to claim 1, further comprising a level for displaying the attitude of the airflow measuring device. 5. The adjusting device, which is provided on the supporting device and adjusts the attitude of the airflow measuring device.
The airflow measurement device according to any one of 1. 6. The airflow measuring device according to claim 1, further comprising a height adjusting device for adjusting the height of the supporting device so that the height of one end of the airflow indicating thread can be adjusted. .