JPH0815148A - Falling ash detector and house equipped with falling ash detector - Google Patents

Abstract

PURPOSE:To obtain a falling ash detector for detecting the falling ash with high sensitivity in volcanic district. CONSTITUTION:A port 3 for introducing the outer air is opened upward through one side of a hood 2 and a discharge port 5 is opened through the other side thereof. A constricted part 8 having reduced air supply cross-section area is formed between the introduction port 3 and the discharge port 5 and a light emission sensor 11 and a light receiving sensor are disposed at the constricted part 8. When a motor fan 7 is rotated, outer air is introduced through the introduction port 3 into the hood 2 and eventually discharged through the discharge port 5. The density of ash in the air is increased at the constricted part 8 and the ash is detected with high sensitivity by means of the light emission sensor 11 and the light receiving sensor.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a ash fall detector for detecting ash fall caused by a volcanic eruption and a house equipped with the ash fall detector.

[0002]

2. Description of the Related Art In a volcanic region such as Sakurajima, for example, volcanic ash produced by an eruption of a volcano (hereinafter, simply referred to as "ash" in the present invention).
(Referred to as) descends to the ground and causes various damages. For example, many crops are cultivated today in greenhouses such as greenhouses, and the houses often have open / closed parts for ventilation, but ash fall occurs when the open / closed parts are open. When the ash adheres to the crops in the house,
It causes poor growth of crops. Also, in schools, if ash falls during physical education on the playground, the ash will damage the eyes. At home,
Dirty laundry that is being dried outdoors, or ash enters the room and pollutes the room. In this way, volcanic regions suffer various damages due to ash fall, and such damages occur daily.

[0003]

[Problems to be Solved by the Invention]
There is no simple and easy way to detect the presence or absence of ash fall at schools and homes, and people are actually observing the presence or absence of ash fall. Therefore, for example, in an agricultural land, since people have visually recognized ash fall and then closed the opening / closing part of the house, ash adheres to the crop during that time, and the crop tends to grow poorly.

Further, in schools and the like, the ash fall warning cannot be issued or is delayed to be issued, during which time children are hurt their eyes, and at home, the laundry and the inside of the room are polluted, and other damages occur daily. . Therefore, an object of the present invention is to provide a ash fall detection device and a house provided with the ash fall detection device that can easily detect the presence or absence of ash in farms, schools, homes, and the like.

[0005]

To this end, the present invention provides an inlet 3 for introducing external air, an outlet 5 for discharging the air introduced from the inlet 3, and an inlet / outlet of the air. Fan 7 for performing the above, and a narrow portion 8 in which the cross-sectional area of the air flow passage is narrowed between the inlet 3 and the outlet 5.
The ash fall detection device 1 is composed of the sensors 11 and 12 for detecting the concentration of ash in the air flowing through the narrow portion 8. Further, the ash fall detection device 1 is provided in the house 30, and the opening / closing of the opening / closing part 31 is controlled by the detection signal of the ash fall detection device 1.

[0006]

In the above structure, when the fan 7 is rotated,
External air is introduced from the inlet 3 and discharged from the outlet 5, but in the meantime, it passes through the narrow portion 8 having a narrowed cross-sectional area. At this narrow space 8, the density (concentration) of ash in the air
Is high, and therefore the ash can be detected with high sensitivity by the sensors 11 and 12. Further, when ash fall occurs, the ash fall detection device 1 promptly detects it and closes the opening / closing part 31 of the house 30 so that the crop is not damaged by the ash fall.

[0007]

Embodiments of the present invention will now be described with reference to the drawings. 1 is a perspective view of the ash fall detector, FIG. 2 is a transverse sectional view thereof, FIG. 3 is a plan view thereof, and FIG. 4 is a partially cutaway front view thereof. In FIG. 1 and FIG. 2, reference numeral 1 is an ash fall detection device, which mainly has a horizontally long hood 2. On the upper surface of one side of the hood 2, an inlet 3 for introducing outside air is opened upward. A screen 4 for insect and bird protection is stretched over the introduction mouth 3. The opening area of the inlet 3 is
It is made much larger than the cross-sectional area of the narrow part described later,
The outside air introduced from the inlet 3 is made to flow through the narrow space with high density.

A discharge port 5 is opened on the other side of the hood 2. A case 6 is attached to the discharge port 5.
An electric fan 7 is arranged inside the case 6, and when the electric fan 7 rotates, external air is introduced from the introduction port 3 and discharged from the discharge port 5. The hood 6 is omitted in FIG.

A narrow portion 8 is formed in the middle of the air flow passage leading from the inlet 3 to the outlet 5. This narrow space 8
The cross-sectional area of is narrower than the cross-sectional area of the inlet 3. A support plate 10 is attached to the lower surface of the hood 2 in which the narrow portion 8 is formed. An optical light emitting sensor 11 and a light receiving sensor 12 are installed on the support plate 10.
The light emitting sensor 11 and the light receiving sensor 12 are installed to face each other so as to sandwich the narrow portion 8 from the left and right.
The density (concentration) of ash in the air flowing through is detected. Here, the horizontal dimension W (see FIG. 3) of the narrow portion 8 is not made small, but the vertical dimension D (see FIG. 2) is made small. The sensor 12 detects the ash concentration in the air flowing through the narrow portion 8 with high sensitivity from the lateral direction.

As shown in FIG. 2, the support plate 10 is attached to the column 14 via the angle member 13. The pillars 14 are erected at desired observation points such as farmlands, greenhouses, and schoolyards. A control panel 15 is attached to the pillar 14.
Is installed. The electric fan 7 and the light emission sensor 1
1, the light receiving sensor 12, etc., are codes 16, 17 (FIG. 3)
Is connected to the electric circuit of the control panel 15.

In FIG. 2, below the inlet 3, the first
The guide plate 20 of is inclined and provided. A lower end portion 20a of the first guide plate 20 is curved in a circular cross section, and a rain sensor 21 is arranged below the lower end portion 20a. By curving the lower end portion 20a in this manner, the rainfall sensor 21 can be hidden behind the first guide plate 20, and the raindrops that have flowed down along the surface of the lower end portion 20a can be rained. The sensor 21 can be surely dropped. 2 and 4
As shown in FIG. 2, the rainfall sensor 21 includes a rod-shaped core member 22.
It is formed by winding two coils 23 with a gap between them. Raindrops flowing down the first guide plate 20 are coil 23.
Coils 23 adjacent to each other, which are dripped on and wound with a gap.
Rain is detected by short-circuiting each other with raindrops.
By arranging the rain sensor 21 so as to be hidden behind the first guide plate 20, the rain drips and raindrops are sucked into the coil 23 and unnecessarily short-circuited. It prevents the false detection.

In FIG. 2, a second guide plate 24 is arranged on the side of the first guide plate 20. The second guide plate 24 is arranged with a downward slope toward the first guide plate 20. Therefore, the raindrops dropped on the second guide plate 24 flow down on the first guide plate 20, further flow down on the first guide plate 20 and drop on the rainfall sensor 21. Therefore, the electric fan 7 is rotated to positively introduce a large amount of external air from the introduction port 3, and raindrops in the air are introduced into the first guide plate 20 and the second guide plate 20 having a wide raindrop collecting area.
By allowing the guide plate 24 to flow down to the rainfall sensor 21, the rainfall can be detected with high sensitivity. An air escape port 2 is provided between the first guide plate 20 and the second guide plate 24.
5 is secured. It should be noted that the ash fall detection device 1 of the present embodiment
Has attached the rainfall sensor 21 as described above,
The rainfall sensor 21 may be omitted. Further, it goes without saying that another type of rain sensor may be used.

The ash fall detector 1 is constructed as described above, and its operation will be described below. 1 and 2, when the electric fan 7 is rotated, external air is introduced into the hood 2 through the inlet 3 and flows toward the outlet 5, but in the narrow portion 8 on the way, the air flow is Squeezed. Therefore, when the air contains ash, the density (concentration) of ash is high in the narrow portion 8, and the luminescence sensor 11 and the light receiving sensor 12 can detect ash with high sensitivity from the lateral direction.

FIG. 5 shows a house 30 equipped with the ash fall detecting device 1. The house 30 is provided with an opening / closing part 31 for ventilation. The opening / closing unit 31 is automatically opened / closed by an opening / closing drive means (not shown) such as a motor. Further, the ash fall detecting device 1 is installed on the pillar 14 standing upright on the side of the house 30. Therefore, when the ash fall detection device 1 detects ash fall, the open / close drive unit is operated by the detection signal to automatically close the opening / closing unit 31, and when the ash fall stops, the opening / closing unit 31 is automatically opened. Of course, even when the rainfall sensor 21 detects rainfall, the opening / closing unit 31 may be automatically closed in the same manner, or may be automatically opened when the rainfall is stopped. A wiring board for controlling the opening / closing drive means may be provided on the control panel 15.

There are various conceivable methods for dealing with the case where ash fall is detected by the ash fall detecting apparatus 1 in addition to the case of the house 30 described above. That is, for example, in a farmer, a school, a household, etc., an alarm element such as a buzzer or a siren may be used to give an alarm to that effect, and in an agricultural land having a sprinkler such as a tea plantation, sprinkler sprinkler is started to sprinkle the crop. The falling ash may be washed away, or the window may be automatically closed in a house or the like.

[0016]

As described above, according to the present invention, the presence or absence of ash fall can be detected with high sensitivity. Moreover, since the ash fall detection device has an extremely simple structure and can be manufactured at low cost, it can be easily and widely used for preventing damage due to ash fall in farms, homes, schools, houses, and the like.

[Brief description of drawings]

FIG. 1 is a perspective view of an ash fall detector according to an embodiment of the present invention.

FIG. 2 is a cross-sectional view of an ash fall detector according to an embodiment of the present invention.

FIG. 3 is a plan view of an ash fall detector according to an embodiment of the present invention.

FIG. 4 is a partially cutaway front view of an ash fall detector according to an embodiment of the present invention.

FIG. 5 is a side view of a house equipped with an ash fall detector according to an embodiment of the present invention.

[Explanation of symbols]

 1 Ash Fall Detector 2 Hood 3 Inlet 5 Outlet 7 Electric Fan 8 Narrow Section 11 Light Emitting Sensor 12 Light Receiving Sensor 21 Rainfall Sensor 30 House 31 Opening / Closing Section

Claims (4)

[Claims] 1. An inlet 3 for introducing external air, an outlet 5 for discharging the air introduced from the inlet 3, a fan 7 for introducing and discharging the air, and the inlet. 3 and the discharge port 5 are provided with a narrow portion 8 in which the cross-sectional area of the air flow passage is narrowed, and sensors 11 and 12 for detecting the concentration of ash in the air flowing through the narrow portion 8. Ash fall detector. 2. The inlet 3 is opened upward on one side of the narrow portion 8, the discharge port 5 is opened on the other side of the narrow portion 8, and below the inlet 3. The ash detection apparatus according to claim 1, wherein a guide plate (20) through which raindrops flow down is disposed so as to be inclined downward, and a rain sensor (21) is provided below the guide plate (20). 3. An inlet 3 for introducing outside air, an outlet 5 for discharging the air introduced from the inlet 3, a fan 7 for introducing and discharging this air, and the inlet. 3 and the discharge port 5, there is provided a ash fall detector 1 comprising a narrow portion 8 having a narrowed cross-sectional area of an air flow passage, and sensors 11 and 12 for detecting the concentration of ash in the air flowing through the narrow portion 8. A house provided with an ash fall detecting device, characterized by controlling the opening and closing of the opening / closing part 31 of the house 30 by the output signal of the ash fall detecting device 1. 4. The ash detection apparatus 1 includes a rainfall sensor 21, and the opening / closing of the opening / closing unit 31 is controlled by an output signal of the rainfall sensor 21.
A house equipped with the ash fall detector described.