JPS604130Y2 - Smoke type wind speed measuring device - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a smoke-type wind speed measuring device suitable for measuring slight wind speed.

As a general microwind speed measuring device, for example, there is a hot wire method.

This device allows wind to come into contact with a hot wire heated by electricity, and determines the wind speed by quantitatively indicating the relationship between the heat loss (temperature drop) taken away by the wind and the current value flowing through the hot wire. However, this device has the drawback of causing errors in measurement values due to the convection generated around the hot wire by the heating of the hot wire itself.Especially when measuring small wind speeds, the error rate becomes large, making accurate measurement almost difficult. becomes.

BACKGROUND OF THE INVENTION There is a great need to measure wind speed inside underground structures such as manholes, and it is desired to provide a light wind speed measurement device that is easy to use and has little error.

The present invention was developed in view of these circumstances, and takes advantage of the fact that smoke does not easily disperse in light winds, but instead flows depending on the wind speed. Alternatively, it is provided so as to reciprocate back and forth at a constant speed and with a constant stroke, and a smoke waveform locus of a constant period according to the wind speed is drawn on the surface of the ruler board, and the periodic width of the smoke waveform trajectory is set on the surface of the ruler board. This device is characterized in that it is configured so that the wind speed can be easily measured by visually reading it from the scale.

An embodiment of the above invention will be described in detail with reference to the drawings.

Reference numeral 1 designates a ruler board, which is provided with guide grooves 2 located at both ends of the ruler board surface to form a reciprocating trajectory for the smoke generation source 3 in the vertical direction, and located under or within the guide groove to guide the smoke generation source 3. This is installed on a ruler board 1 and provided so that it can be reciprocated within the groove 2 along the board surface at a constant speed and a constant stroke using a reciprocating mechanism.

The reciprocating drive mechanism, for example, as shown in FIG.
A mechanism is used to transmit the information.

The smoke generating source 3 is configured by, for example, a movable table 6 equipped with a smoke generating material holding cylinder 6a, slidably supported by a guide 7 on the lower surface of a ruler board, and a smoke generating material 8 being held in the holding cylinder 6a.

On the other hand, a scale 9 is provided on a board located on the side of the smoke generating source 3 so as to be perpendicular to the reciprocating trajectory of the smoke generating source 3.

The length of each graduation line 9a of the scale 9 is set to be longer than the movement stroke of the smoke generation source 3.

Preferably, a reference line 9b is provided perpendicular to the center of the movement stroke.

Scale 9 is the range of micro wind speed measurement, e.g. 20-30cm
It is sufficient if the dimensions are within the range of .

For example, if the smoke generating material 8, such as an incense stick, is placed on the support tube 6a and the switch S is turned on to operate the reciprocating mechanism,
The smoke generation source 3 reciprocates within the guide groove 2 along the board surface at a constant speed and with a constant stroke.

When the smoke generation source 3 is reciprocated, the smoke 1a moves in the flow direction of the smoke 3a as shown in FIGS. The smoke waveform locus 3a' having a constant period is superimposed on the scale 9 and drawn.

That is, one round trip of the smoke generation source 3 draws a smoke waveform locus of 1/2 period on the scale.

The wind speed per unit time can be easily calculated by reading the period S of the smoke waveform locus 3a drawn in this way using the scale 9 and dividing the read dimension by the moving speed (time) of the smoke generation source 3. is possible.

For example, if the speed of one reciprocating movement of the smoke generation source 3 is set as the wind speed unit time of 1 second, the period (half period) of the smoke waveform locus 3a' drawn by one reciprocating movement of the smoke generation source 3 is maintained as it is. Wind speed per second.

In other words, if the length of S is 30cm, the wind speed at that time is 30c.
m/sec.

If the speed of one reciprocating movement of the smoke generation source 3 is 3 seconds, the wind speed at that time is 10 cm/Sec.

Since the smoke waveform locus 3a' is formed superimposed on the scale 9, by reading the interval between peaks or troughs of the smoke waveform locus 3a' in comparison with the scale 9, the wind speed can be determined at a glance.

The reciprocating mechanism of the smoke generation source 3 uses, for example, a deceleration motor,
A known mechanism for converting the rotational motion of the motor into reciprocating motion may be employed.

As is known, by moving the smoke generation source 3 parallel to the ruler board surface, a smoke waveform trajectory 3 corresponding to the wind speed is displayed on the scale 9.
a' can be easily generated.

The smoke generation source 3 is preferably one that stably generates smoke and burns slowly, such as an incense stick.

The structure of the smoke generation source is determined depending on the smoke generation material.

For example, when using a shaft-shaped smoke-generating material such as an incense stick or a string-like smoke-generating material, a method such as setting a small-diameter smoke-generating material holding cylinder on the reciprocating part and facing into the long groove as described above. Take.

For example, when combusting granules or powder, a small-diameter smoke discharge pipe may be provided in the combustion chamber, and its discharge port may be erected within the guide groove.

It is optional to use a chemical or the like as the smoke generating material, or to ignite it electrically.

As described above, by simply reciprocating the smoke generation source at a constant speed and with a constant stroke, it is possible to draw a smoke waveform locus with a constant period according to the wind speed by the smoke flowing from the smoke generation source, and the smoke waveform By simply reading the period of the trajectory on a scale, it is possible to easily measure the wind speed per unit time.

Measurement is extremely simple, and the termination device has a simple structure and can be provided at low cost.

The present invention is very suitably implemented for measuring low wind speeds where smoke is not destroyed.

According to the present invention, a smoke waveform locus with a constant period according to the wind speed is drawn, and the wind speed is determined from the waveform, so that it is possible to measure the wind speed with extremely small tolerable errors.

FIG. 4 shows another example in which the ruler board 1 is box-shaped as shown, and is provided with a reciprocating drive mechanism storage section 1a, an opening/closing lid 1b, and a container for small items such as extracting smoke-generating materials. A storage section 1C is provided, and a hanging belt 1d is further provided to make it convenient to use and carry.

[Brief explanation of drawings]

Fig. 1 is a perspective view of a microwind speed measuring device showing a specific embodiment of the present invention, Fig. 2 is a schematic plan view showing the reciprocating drive mechanism of the same smoke generation source, and Fig. 3 is a partial cross-section of the same measuring device. 4 is a perspective view showing another example of the same measuring device, and FIGS. 5A to 5E are diagrams showing the smoke waveform locus generation process. 1... Ruler board, 2... Smoke generating source reciprocating guide groove, 3... Smoke generating source, 3a...
Smoke, 3a'...Smoke waveform locus, 9...Scale, S...Period.

Claims (1)

[Scope of utility model registration request] A smoke generation source is provided that is reciprocated at a constant speed and with a constant stroke along the surface of a ruler board, and a scale for measuring the periodic width of the smoke waveform trajectory is placed on the surface of the ruler board so as to overlap with the smoke waveform trajectory generated from the smoke generation source. A smoke-type microwind speed measurement device that is characterized by: