JPH08184536A - Method and apparatus for detecting pollution of air through sampling system - Google Patents

Abstract

PURPOSE: To keep a constant flow rate of air being sucked through each suction hole of a sampling tube by making an opening at the forward end part thereof and regulating the flow rate of the air being sucked through the opening. CONSTITUTION: A sampling tube having a plurality of suction holes is arranged in an alarm area and an opening 7 is made at the forward end of the sampling tube and then a suction air regulation mechanism 8 is disposed at the opening 7. The air in the alarm area is sucked through the opening 7 at the forward end of the sampling tube as well as through a plurality of suction holes of the sampling tube. The suction air regulation mechanism 8 regulates the flow rate of air being sucked through the opening 7 arbitrarily thus arbitrarily regulating the flow rate of air being sucked through the suction holes relatively. With such arrangement, flow rate of the air being sucked through the suction hole can be kept constant regardless of the number of suction holes of the sampling tube or the like.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to air pollution by a sampling system in which air in a caution area is sucked by a sampling pipe and the pollution status of the sucked air is detected to detect the pollution status of air in the caution area. The present invention relates to a detection device and an air pollution detection method.

[0002]

2. Description of the Related Art Conventionally, air is sucked using a long sampling pipe having a plurality of suction holes in a caution area such as a clean room or a house of various factories where it is necessary to monitor the state of air pollution. Air pollution detection devices and air pollution detection methods are widely used. In such an air pollution detection device and air pollution detection method, the air in the above-mentioned caution area is sucked through each suction hole of the sampling tube, and the polluted state of the sucked air is provided at the proximal end of the sampling tube. In addition, the pollution state of the air in the caution area is detected by the pollution detection unit. Further, there has been proposed an air pollution detecting device by a sampling method which detects the occurrence of a fire and the progress of the fire from the viewpoint of detecting fine particles as well as the state of air pollution using such a device.

In such a conventional air pollution detection apparatus using a sampling method, a method is generally used in which a plurality of suction holes are formed in a sampling pipe and air is sucked from the suction holes to sample the air in the caution area. Is. In this case, in the conventional air pollution detection method by the sampling method, the tip of the sampling tube is closed to suck air only through a plurality of suction holes formed in the sampling tube, and the tip has a small air suction tip. In some cases, a carrier air suction opening having a hole is provided and air is sucked from the opening. At this time, the amount of suction air from the sampling tube was adjusted to the amount with the highest contamination detection efficiency by optimizing the total area of the suction holes and the area and number of small holes at the tip.

[0004]

Here, in the conventional air pollution detecting device by such a sampling method, a plurality of suction holes are simply formed as air suction portions for the sampling tube, or the tip end portion is formed. Since the small holes are provided, the amount of air sucked from each suction hole is determined only by the number and diameter of these suction holes. In this case, in the case where the tip portion is closed, it takes time for the sample air sucked near the tip portion to reach the detector, and there is a problem that the abnormality detection is delayed. Also, in the case of an opening provided at the tip,
There is also a problem that the sample air is diluted by the air flowing in from the tip, and the detection sensitivity changes depending on the installation conditions.

On the other hand, the number and diameter of the suction holes formed in the sampling tube are properly determined individually according to the size of the caution area where the sampling tube is arranged. Therefore, it is no exaggeration to say that the specifications of the suction holes differ for each sampling tube. Therefore, the amount of air sucked from each suction hole is different for each sampling tube, and the obtained detected concentration differs depending on what sampling tube is used to suck the contaminated air having the same concentration. For this reason,
Even at the same location, if different sampling tubes were installed, there was a problem that the detection levels of the sampling tubes could not be kept constant.

For example, as shown in FIGS. 6 and 7, a sampling tube 2X provided with five suction holes 5 and ten suction holes 5 are provided.
Consider a case where there is a sampling tube 2Y provided with. If the total amount of air sucked through each sampling tube 2X, 2Y is 10Q, the amount of air sucked from each suction hole 5 of the sampling tube 2X is 2Q (10Q / 5). On the other hand, the amount of air sucked from each suction hole 5 of the sampling tube 2Y is 1Q (10Q / 10).

Therefore, when 20% -concentrated polluted air is sucked from any of the suction holes 5 of the sampling tube 2X, 0.4Q (= 2Q × (20 ÷ 100)) of pollutants is sucked. And the detected concentration is 4% (= (0.4
Q ÷ 10Q) × 100). On the other hand, when contaminated air having a concentration of 20% is sucked from any of the suction holes 5 of the sampling tube 2Y, 0.2Q (= 1Q × (20 ÷
Only the pollutant of 100)) is sucked, and the detected concentration is only 2% (= (0.2Q / 10Q) × 100). That is, for contaminated air of the same concentration,
The detected concentration obtained differs depending on which sampling tube is used for suction, and the detected concentration cannot be made constant between sampling tubes. In this case, in order to make the detected concentrations constant among the sampling tubes, it is necessary to change the program of the contamination detection unit that analyzes the contamination state of the sucked air in accordance with the number of suction holes provided in the sampling tubes.

Also, when a plurality of sampling pipes are provided for one contamination detection unit, the detected concentration differs depending on the sampling pipe into which the contaminated air is sucked in, as described above. Therefore, in order to make the detected concentrations constant among the sampling tubes, it is necessary to change the program of the contamination detection section according to the number of suction holes provided in the sampling tubes. However, in the case where a plurality of sampling tubes are provided for one contamination detection unit in this way,
The air sucked through each sampling tube is merged to detect the contamination state. Therefore, it is not possible to determine which sampling pipe the contaminated air was sucked through, and it is impossible to perform a program process according to the sampling pipe, so that the contaminated state cannot be accurately detected in the end. was there. This becomes apparent especially when a new sampling tube is added.

For example, as shown in FIG. 8, consider a case where a sampling tube 2T provided with ten suction holes 5 is newly installed with respect to a sampling tube 2S provided with five suction holes 5. In this case, the air from both sampling tubes 2S and 2T is merged and the contamination state is detected. Where 2
The total amount of air sucked through one sampling tube 2S, 2T is 20Q, and the total amount of air sucked through each sampling tube 2S, 2T is 10Q. Also in this case, if the same as the above case, the sampling tube 2S
When 20% of the contaminated air is sucked into any of the suction holes, the detected concentration is 2%. However, when the contaminated air of 20% concentration is also sucked into any of the suction holes of the sampling tube 2T, the detected concentration is only 1%.

That is, in order to make the detected concentrations constant among the sampling tubes, it is clear that the program of the contamination detecting section needs to be changed depending on the number of suction holes provided in the sampling tubes. However, as described above, since the program processing corresponding to the sampling tube in this case is impossible, the contamination state cannot be accurately detected in the end.

The present invention solves such a problem, and provides an air pollution detecting device and an air pollution detecting method by a sampling method which can make the amount of air sucked from each suction hole constant in any case. It is intended to be provided.

[0012]

In order to solve such a problem, the present invention according to claim 1 provides a long sampling pipe for sucking air in the warning area in the warning area, and A plurality of suction holes for sucking the air in the warning area is formed along the longitudinal direction of the sampling tube, and the state of contamination of the air sucked from the suction holes is provided at the base end of the sampling tube. In the air pollution detection device by the sampling method for detecting the pollution state of the air in the caution area by detecting with the pollution detection part, an opening is formed at the tip of the sampling pipe, and the opening is By adjusting the amount of air sucked through the opening, the suction air amount adjusting mechanism for increasing / decreasing the air suction pressure of the suction hole to increase / decrease the amount of air sucked from the suction hole is provided. It is set to.

Further, according to the present invention of claim 2, the air in the warning area is sucked through a plurality of suction holes of the sampling tube arranged in the warning area, and the sucked air is sucked at the base end portion of each sampling tube. By merging and detecting the contamination state of the air sucked in by the contamination detection unit provided at this base end,
In an air pollution detection method by a sampling method for detecting the pollution state of air in the caution area, an opening is formed at the tip of the sampling tube, and the air sucked into the opening through the opening. By adjusting the amount of air sucked through the opening by the suction air amount adjusting mechanism to increase or decrease the air suction pressure of the suction hole. It is configured to increase or decrease the amount of air sucked from the holes.

Further, according to the present invention of claim 3, a plurality of the sampling pipes are arranged in the warning area, and the suction air amount adjusting mechanism provided in each of the sampling pipes allows the air in the suction hole to be provided for each sampling pipe. The suction amount is increased or decreased to make the air suction amounts of all the suction holes of the plurality of sampling tubes substantially equal, and the air sucked from the suction holes is merged, and the contamination state of the air is detected by the contamination detection unit. Is detected to detect the state of air pollution within the caution area.

[0015]

According to the air pollution detection device of the sampling system configured as described above, not only the air in the caution area is sucked through the plurality of suction holes formed in the sampling tube, but also the tip portion of the sampling tube is sucked. Air is also sucked from the opening. Then, the amount of air sucked through the opening is arbitrarily increased or decreased by the suction air amount adjusting mechanism provided in the opening, whereby the amount of air sucked through the suction hole is relatively adjusted. To be done. As a result, the amount of air sucked from the suction holes becomes constant regardless of the number of suction holes formed in the sampling tube.

Even when a plurality of sampling pipes are used, the air sucked from the suction holes of each sampling pipe is adjusted by adjusting the suction air amount adjusting mechanism of each sampling pipe to increase or decrease the suction air amount from the opening. The amount is adjusted accordingly. As a result, regardless of the number of suction holes formed in the sampling tube and the like, the amount of air sucked from the suction holes of any sampling tube becomes constant.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS An embodiment of an air pollution detecting device and an air pollution detecting method according to the present invention will be described in detail below with reference to the drawings. FIG. 1 is a diagram showing the overall configuration of the air pollution detection device of this embodiment, and FIG.
It is an expanded sectional view of a part. In the air pollution detection device of this embodiment, a sampling tube 2 having a plurality of suction holes 5 is arranged in a warning area 1, an opening 7 is provided at the tip of the sampling tube 2, and suction air is drawn in the opening 7. The configuration is such that a quantity adjusting mechanism 8 is provided. According to the present invention, the suction air amount adjusting mechanism 8 adjusts the suction air amount from the opening 7 to adjust the suction air amount from each suction hole 5.

Here, the alert area 1 means a space area in which it is necessary to detect the state of air pollution including fire, such as a clean room of various factories, a living room of a general house, or a room of a ship's hold. It mainly targets indoor spaces. Further, in the present embodiment, the warning area 1 is assumed to be a clean room as shown in FIG. 1, and an air purification device 10 is provided to keep the indoor air clean. This air purification device 10 is used in the warning area 1
The duct 11 connected to the inner space and this duct 1
1 and a ventilation part 12 provided to be connected to the air conditioner 1, and a filter part 13 arranged at an air outlet of the duct 11 to the caution area 1. In this air purification device 10, the air in the caution area 1 is sucked from below the floor via the duct 11. Then, the air is cleaned in the ventilation unit 12, and the cleaned air is passed through the filter unit 13 and the duct 1
Send from the ceiling side of 1 into the warning zone 1.

The sampling pipe 2 arranged in the caution area 1
As shown in FIG. 2, the warning area 1 is a long one that extends over substantially the entire length thereof, and is formed of a hollow cylindrical member, and its internal space serves as a suction passage 6. The sampling tube 2 may be formed of a hollow rectangular tube member or another deformable member, and the shape is not limited as long as it has the suction passage 6 therein. Further, in FIG. 1, the sampling pipe 2 is shown as being arranged in the vicinity of the ceiling of the caution area 1. However, it is desirable that the sampling tube 2 is originally arranged on the downstream side of the air flow in the caution area 1. In a clean room, the air flow normally flows from top to bottom, so that the sampling pipe 2 is also arranged near the floor.

The sampling tube 2 thus formed has its base end portion extended from the guard area 1 to the outside. At the base end of the sampling tube 2 extended to the outside of the room, a pollution detection unit 3 for detecting the degree of pollution of air, and a suction fan for sucking the air in the caution area 1 so as to reach the pollution detection unit 3 4 and 4 are connected in series. Here, the contamination detection unit 3
May have any configuration as long as it can detect the air pollution state. However, in the present embodiment, in view of smoke detection due to fire, not only the dust detection means, but especially the smoke detection section and smoke detection are performed. A configuration having a circuit section for use is assumed (these are not shown). The smoke detector is composed of a laser diode for light emission and a photodiode for light reception, and the scattered light emitted when smoke particles pass through the optical axis of the laser diode for light emission is received by the photodiode for light reception and is received. The number of smoke particles is counted by the number of generated pulses to detect the air pollution state. The circuit part is
The air pollution concentration is calculated by capturing and counting the signal pulse of the smoke detector for a predetermined time. On the other hand, as long as the suction fan 4 is also capable of constantly generating a negative pressure sufficient to suck a predetermined amount of air in the caution area 1 so as to reach the contamination detection unit 3, It may be configured.

The plurality of suction holes 5 formed in the sampling tube 2 are formed on the lower surface side of the sampling tube 2 at substantially the same intervals along the longitudinal direction thereof. By forming the plurality of suction holes 5 in this manner, a small amount of air in the caution area 1 is sucked from each suction hole 5. Then, the air from each suction hole 5 merges in the suction passage 6 of the sampling tube 2 and is guided to the contamination detection unit 3 through the suction passage 6.

Generally, in the air pollution detection device of the sampling type, the differential pressure from the outside air becomes smaller at a position farther from the suction fan 4 arranged at the base end of the sampling tube 2. Therefore, the suction pressure of the suction hole 5 on the tip end side of the sampling tube 2 is lower than the suction pressure of the suction hole 5 on the base end side. Therefore, if the suction holes 5 have the same diameter, the amount of sucked air decreases toward the tip end side. Therefore,
In order to eliminate this inconvenience, in the sampling tube 2 shown in the present embodiment, the diameter of the suction hole 5 on the proximal end side is made smaller than the diameter 5 of the suction hole on the distal end side so that The amount of air drawn is constant. The number and the position of the suction holes 5 are not limited to those shown in the figure, and may be arbitrarily determined according to the intended warning state.

By the way, at the tip of the sampling tube 2 of the present embodiment, the opening 7 for sucking the air in the caution area 1 is provided as described above. In the conventional system, there is a system in which the tip portion of the sampling tube 2 made of a circular tube is closed to prevent ventilation, but in the present embodiment, the opening portion 7 is formed by opening the tip portion without closing it.
Is formed. When using the sampling tube 2 whose tip is already closed, a through hole may be formed in the tip to form the opening 7. That is, regardless of the structure, the opening 7 for sucking the air in the caution area 1 may be formed at the tip of the sampling tube 2. The opening 7 allows the air in the caution area 1 to freely flow into the suction path 6 of the sampling tube 2. The position where the opening 7 is provided is set to the tip end of the sampling tube 2 because the air sucked through the opening 7 is not contaminated air but clean air in this embodiment. Yes, the air around the tip is more likely to be less polluted than the air around the other parts.

The suction air amount adjusting mechanism 8 is provided in the opening 7 as described above. As shown in FIG. 2, the suction air amount adjusting mechanism 8 is configured such that an opening / closing plate having substantially the same diameter as the outer diameter of the sampling tube 2 is openably and closably provided on the tip end surface of the sampling tube 2. Although not shown, the suction air amount adjusting mechanism 8 is provided with an opening / closing angle adjusting mechanism that can arbitrarily change the opening / closing angle of the opening / closing plate, and adjusts the amount of air sucked through the opening 7. It can be adjusted arbitrarily. The suction air amount adjusting mechanism 8 is not limited to that of the present embodiment, and a slide gate, a ball valve, a sphere valve, a reverse cone valve, a rotary ring valve, a pipe valve, a throttle mechanism may be used, and the opening 7 can be used. Any one may be used as long as the amount of air sucked through the can be adjusted arbitrarily. Further, if the concept of “valve” is broadly interpreted, in addition to the above-described suction air amount adjusting mechanism 8, the suction air amount adjusting mechanism 8 can be freely fitted to the tip end portion of the sampling tube 2 and different numbers and diameters of perforations can be formed. You may comprise by the multiple types of cap material which has. In this case, the cap material may be changed depending on the amount of air to be sucked through the opening 7.

By providing the opening 7 and the suction air amount adjusting mechanism 8 in the sampling tube 2 in this manner, the suction air amount adjusting mechanism 8 can be operated to adjust the amount of air sucked from each suction hole 5. . Thus, the detection concentrations of the sampling tubes 2 can be made constant. Hereinafter, the constant detection concentration will be specifically described with an example. For example, as shown in FIGS. 3 and 4, five suction holes 5
And sampling tube 2A provided with suction air amount adjusting mechanism 8
Consider a case in which there is a sampling tube 2B provided with ten suction holes 5. First, assuming that the total amount of air sucked through each sampling tube 2 is 10Q, the amount of air sucked from each suction hole 5 of the sampling tube 2A is 2Q when the suction air amount adjusting mechanism 8 is closed. (10Q / 5). On the other hand, the amount of air sucked from each suction hole 5 of the sampling tube 2B is 1Q (10Q / 10),
The amount of air sucked from each suction hole 5 depends on the sampling tube 2
A and the sampling tube 2B are different.

However, if the suction air amount adjusting mechanism 8 of the sampling tube 2A is opened so that the amount of air sucked from the opening 7 becomes 5Q, the air sucked from each suction hole 5 of the sampling tube 2A. Is 5Q (10Q-5
Q), and the amount of air sucked from each suction hole 5 is 1Q
(5Q / 5). Therefore, the amount of air sucked from each suction hole 5 of the sampling tube 2A can be made the same as the amount of air sucked from each suction hole 5 of the sampling tube 2B, and as a result, the detection concentration between the sampling tubes 2A and 2B is constant. Can be realized.

It will be explained more generally that the detection sensitivity can be made constant by adjusting the amount of air sucked from the opening 7 by the suction air amount adjusting mechanism 8.
First, when the amount q of air sucked from each suction hole 5 and the number of suction holes 5 are n, the total amount Qa of air sucked from each suction hole 5 is represented by n · q. On the other hand, if the hole area of the opening 7 is S, the pressure difference in the opening 7 is P, and the constant is K, the amount Qb of air sucked from the opening 7 is K · S · √.
Represented by P. Therefore, if it is assumed that the contaminated air having the pollution degree x is sucked from any of the suction holes 5 and the clean air is sucked from the other suction holes 5 and the opening 7, the detected concentration in the contamination detection unit 3 is determined. X is x · q / (Qa + Qb)
It can be rewritten as X = x · q / (n · q
+ K · S · √P). Here, q, n, K, and √P are constant values determined by design or the like, so the detected concentration X is the hole area S of the opening 7 with respect to the air of a certain pollution level x.
It is determined only by the suction air amount adjustment mechanism 8 and the opening 7
The detection sensitivity can be made constant by adjusting the amount of air sucked from the.

The case where one contamination detection unit 3 is provided for one sampling tube 2 has been described so far, but when one contamination detection unit 3 is provided for a plurality of sampling tubes 2 next. Will be described. This is currently 1
There is one sampling tube 2, and the same applies when another sampling tube 2 is added to this. FIG. 5 is a diagram showing the configuration of the sampling tube 2 of the second embodiment of the present invention in which a plurality of sampling tubes 2 are arranged. In the air pollution detection device based on the sampling method shown in FIG. 5, a plurality of sampling tubes 2 are arranged, a plurality of suction holes 5 are formed for each sampling tube 2, and the base end portions of the sampling tubes 2 are joined together. The contamination detection unit 3 provided at the base end is configured to detect the contamination state of the air sucked from the plurality of suction holes 5. Here, an opening 7 and an intake air amount adjusting mechanism 8 are provided at the tip of each of the plurality of sampling pipes 2, and the air in the caution area 1 is the opening 7 of each sampling pipe 2 and the intake air amount adjusting mechanism 8. It is possible to freely flow into the suction passage 6 of the sampling tube 2 via the.

When a plurality of sampling tubes 2 are arranged in this way, each sampling tube 2 is provided with an opening 7 and a suction air amount adjusting mechanism 8 so that the suction air amount adjusting mechanism 8 can be operated. The amount of air sucked from 5 can be adjusted, and thus the detection concentrations of the sampling tubes 2 can be made constant. For example, as shown in FIG.
Consider a case where the sampling pipe 2C provided with the individual suction holes 5 and the suction air amount adjusting mechanism 8 and the sampling pipe 2D provided with only the ten suction holes 5 are merged to detect the air pollution state. First, assuming that the total amount of air sucked through each sampling tube 2 is 10Q, 2Q (= 10Q / 5) from each suction hole 5 of the sampling tube 2C when the suction air amount adjusting mechanism 8 is closed. Air is sucked. Also,
From each suction hole 5 of the sampling tube 2D, 1Q (= 10Q
Since the air of ÷ 10) is sucked, the amount of air sucked from each suction hole 5 differs depending on the sampling tube 2.

Here, the suction air amount adjusting mechanism 8 is so arranged that air of 5Q is sucked from the opening 7 of the sampling tube 2C.
When opened, the total amount of air sucked from the five suction holes 5 of the sampling tube 2C is 5Q (10Q-5Q), and the amount of air sucked from each suction hole 5 of the sampling tube 2C is 1Q (5Q ÷ 5). On the other hand, sampling tube 2D
The amount of air sucked from each suction is 1Q (10Q ÷ 1
Therefore, by opening the suction air amount adjusting mechanism 8 of the sampling pipe 2C, the amount of air sucked from the suction holes 5 of the sampling pipe 2C and the sampling pipe 2D can be equalized.

Therefore, even if 20% -concentrated contaminated air is sucked into either of the suction holes of the sampling tubes 2C and 2D, 0.2Q (= 1Q × (20 ÷ 100)) of pollutant is sucked, and the detected concentration is 1% (= (0.2Q ÷ 20Q) ×
100) can be detected. That is, the detected concentration with respect to the contaminated air having the same concentration can be made uniform regardless of the position of the suction hole 5 where the contaminated air is sucked, and the contaminated state can be accurately detected.

Next, an air pollution detection method by the sampling method to which the present invention is applied will be described. here,
It is assumed that a plurality of sampling tubes 2 are arranged as described above, and a contamination state is detected by the contamination detecting section 3 provided at the confluence of the base ends of the sampling tubes 2. First, the suction fan 4 is activated to suck air from the suction holes 5 of the sampling tubes 2. Then, by actually measuring the amount of air sucked, it is determined whether or not the amounts of air sucked from the suction holes 5 are different from each other. Alternatively, the suction fan 4 is not actually started, and the amount of air sucked through the suction holes 5 is calculated based on the number of suction holes 5 formed in each sampling tube 2, and the air sucked through the suction holes 5 is calculated. It may be determined in advance whether or not the amounts are different from each other.

When it is determined that the amount of air sucked from the suction holes 5 of each sampling tube 2 is different, the suction air amount adjusting mechanism 8 provided at the tip of each sampling tube 2
To adjust the amount of air sucked through the opening 7 provided at the tip. This adjustment is performed for each sampling tube 2 other than the sampling tube 2 in which the amount of air sucked from the suction hole 5 is the smallest. That is,
The amount of air sucked from each suction hole 5 of the sampling tube 2 to be adjusted is the suction hole in the sampling tube 2 (hereinafter, the minimum suction amount sampling tube is abbreviated) in which the amount of suction air from the suction hole 5 is the smallest. It is performed so as to be substantially the same as the suction air amount of No. 5. Specifically, by opening and closing the suction air amount adjusting mechanism 8 while actually measuring the amount of air sucked from each suction hole 5, or based on the number of suction holes 5 formed in each sampling tube 2 and the like. It is performed by opening and closing the suction air amount adjusting mechanism 8 so as to achieve a predetermined opening and closing degree calculated in advance.

Further, taking the above-mentioned air pollution detecting device shown in FIG. 5 as an example, when the suction air amount adjusting mechanism 8 of the sampling tube 2C is closed, the sampling tube 2C is
The amount of air sucked from each suction hole 5 is 2Q. Further, since the amount of air sucked from each suction hole 5 of the sampling pipe 2D is 1Q, the minimum suction amount sampling pipe 2
Adjustment is performed for the sampling tubes 2C other than D.
Thereby, the suction air amount is adjusted so that the amount of air sucked from each suction hole 5 of the sampling pipe 2C to be adjusted is substantially the same as the suction air amount of each suction hole 5 of the minimum suction amount sampling pipe 2D. The opening / closing degree of the mechanism 8 is adjusted, and the amount of air sucked from all the suction holes 5 becomes the same 1Q.

[0035]

As described above, the present invention according to claims 1 and 2 is an air pollution detecting device of a sampling system for detecting the pollution state of air in a warning area, and an opening is provided at the tip of the sampling pipe. , The opening is provided with a suction air amount adjusting mechanism for increasing or decreasing the amount of air sucked through the opening, and by operating the suction air amount adjusting mechanism to adjust the suction air amount from the opening, There is an effect that the amount of air sucked from each suction hole can be adjusted, and the amount of air sucked from each suction hole can be made equal regardless of the number of suction holes and the like. Therefore, it is possible to make the detected concentration constant when various sampling tubes are used without complicated program processing.

Furthermore, the present invention according to claim 3 provides an opening at the tip of a plurality of sampling tubes, and adjusts the amount of suction air to increase or decrease the amount of air sucked through the opening in the opening. By installing a mechanism and operating each suction air amount adjustment mechanism to adjust the suction air amount from the opening with each sampling tube, regardless of the number of suction holes between each sampling tube, The effect is that the amount of air sucked can be made equal. Therefore, it is possible to overcome the difficulty of detecting the pollution caused by the confluence of the sucked air and enable the accurate detection of the pollution state of the air.

[Brief description of drawings]

FIG. 1 is a diagram showing an overall configuration of an air pollution detection device according to an embodiment of the present invention.

FIG. 2 is an enlarged cross-sectional view of a portion A of FIG.

FIG. 3 is a diagram showing a configuration of a sampling tube in the air pollution detection device of one embodiment of the present invention.

FIG. 4 is a diagram showing a configuration of a sampling tube in the air pollution detection device of one embodiment of the present invention.

FIG. 5 is a diagram showing a configuration of a sampling tube in an air pollution detection device according to another embodiment of the present invention.

FIG. 6 is a diagram showing a configuration of a sampling tube in a conventional air pollution detection device.

FIG. 7 is a diagram showing a configuration of a sampling tube in a conventional air pollution detection device.

FIG. 8 is a diagram showing a configuration of a sampling tube in another example of the conventional air pollution detection device.

[Explanation of symbols]

 1 Warning Area 2 Sampling Tube 2A to 2D Sampling Tube 3 Contamination Detection Section 4 Suction Fan 5 Suction Hole 6 Suction Path 7 Opening Section 8 Suction Air Volume Control Mechanism 10 Air Purification Device 11 Duct Section 12 Ventilation Section 13 Filter Section

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Ichiro Endo 2-1043 Kamiosaki, Shinagawa-ku, Tokyo Within Ho Chiki Co., Ltd. (72) Inventor Koue Miyao 2-1043 Kamiosaki, Shinagawa-ku, Tokyo Ho Chiki Co., Ltd. (72) Inventor Kento Nakai 2-1043 Kamiosaki, Shinagawa-ku, Tokyo Ho Chiki Co., Ltd.

Claims (3)

[Claims] 1. A long sampling tube for sucking air in the warning zone is arranged in the warning zone, and air in the warning zone is sucked along the longitudinal direction of the sampling tube. By forming a plurality of suction holes, the contamination state of the air sucked from the suction holes is detected by the contamination detection unit provided at the proximal end of the sampling tube, thereby detecting the contamination state of the air in the caution area. In an air pollution detection device by a sampling method for detecting, an opening is formed at the tip of the sampling tube, and the amount of air sucked through the opening is adjusted in the opening to thereby remove the suction hole. An air pollution detection device by a sampling method, which is provided with a suction air amount adjusting mechanism for increasing / decreasing the air suction pressure of the device and increasing / decreasing the amount of air sucked from the suction holes. 2. The air in the warning area is sucked through a plurality of suction holes of the sampling tube arranged in the warning area, and the sucked air is joined at the base end of each sampling tube, In the air pollution detection method by the sampling method, which detects the pollution status of the sucked air by the provided pollution detection section to detect the pollution status of the air in the above-mentioned caution area, an opening is formed at the tip of the sampling pipe. In addition, a suction air amount adjusting mechanism for adjusting the amount of air sucked through the opening is provided in the opening, and the amount of air sucked through the opening is adjusted by the suction air amount adjusting mechanism. By adjusting the air suction pressure of the suction hole to increase or decrease the amount of air sucked from the suction hole. . 3. A plurality of the sampling pipes are arranged in the caution area, and the suction air amount adjusting mechanism provided in each of the sampling pipes increases / decreases the air suction amount of the suction hole for each sampling pipe. The air suction amount of all the suction holes of the sampling tube is made substantially equal, and the air sucked from the suction holes is merged, and the pollution state of the air is detected by the pollution detection unit to detect the inside of the caution area. The air pollution detection method according to claim 2, wherein the air pollution state of the air is detected.