JP3278788B2 - Odor detection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an odor detecting device using a sampling tube.

[0002]

2. Description of the Related Art Conventionally, for the purpose of monitoring the environment in a building or the like, an odor detection device for detecting an odor or the like has been used. In this device, a sensor section is usually arranged at a position where odor of a measurement target is most likely to occur, and odor is often monitored in a spot. Also,
If the sensor unit cannot be separated by disposing the entire apparatus at a predetermined position, a sampling tube is provided in a monitoring area using a pump or the like and suction is performed to the sensor unit.

[0003]

In recent years, it has been proposed that detecting a burning odor for detecting a fire in comparison with smoke, heat, or the like, which has been conventionally monitored, leads to early detection. In this case, it is not possible to specify the location of the odor caused by the occurrence of the fire, so it is desirable to uniformly sample the odor from each part in the monitoring area.

[0004]

SUMMARY OF THE INVENTION An object of the present invention is to provide a plurality of suction pipes provided with openings for sampling odors at predetermined intervals for the purpose of detecting odors even in a wide monitoring area. A detection chamber in which an odor sensor for detecting odor is arranged, and an introduction pipe connected to the detection chamber from a connection pipe connected to each of the suction pipes, and the plurality of suction pipes are The connection pipes are arranged at predetermined intervals to uniformly monitor the monitoring area, and the connection pipe is a connection pipe connecting two central portions or end portions of the plurality of suction pipes, and a connection pipe of the plurality of suction pipes. A connecting pipe connecting one central part or a terminal part and a central part of the connecting pipe, and a connecting pipe connecting two central parts of the connecting pipes, and a plurality of the connecting pipes are selectively combined with each other; Introductory pipe It is continued, is characterized in that it is equally the time from the suction pipe to the detection chamber.

[0005]

[0006]

A plurality of suction pipes having openings for sampling odors are evenly arranged in the monitoring area, and the pipe structure from each suction pipe is connected to the central portion thereof and introduced into the detection chamber. There is no deviation in the arrival time to the detection chamber at both ends of the tube. Therefore, it is possible to equalize the time from sampling the odor to detection.

Further, by providing an opening for sampling uniformly in the monitoring area and arranging a connection or the like at one end of the monitoring area, the degree of freedom of other equipment in the central portion can be secured.

[0008]

An embodiment of the present invention will be described below.

FIG. 1 is a block diagram schematically showing a configuration of an odor detection apparatus to which the present invention is applied. In FIG. 1, reference numeral 1 denotes an odor sensor, which is connected to a standardized output unit 10. The reference output unit 10 includes an A / D converter 11 for converting an analog output of the odor sensor 1 into a digital output, a memory 12 for storing various set values, a ROM 13 for storing a program such as a processing procedure, and the like.
A CPU 14 which is connected to each unit and calculates and outputs a numerical value indicating an odor intensity such as a standardized odor index (compared with an odor in the presence of a predetermined concentration of a predetermined substance) from a digital output of the odor sensor 1; It is configured. Then, from this output, it is possible to grasp the presence of odor and the degree of danger such as fire discrimination.

[0010] The odor sensor 1 is provided with a suction pump 21.
Is provided in a detection chamber 23 through which air sucked from the monitoring area via the sampling pipe 22 passes. FIG. 2 is a piping diagram showing a piping system of the sampling pipe 22 to the detection chamber 23.

The sampling pipe 22 has four suction pipes 24 for sampling odors from each part of the monitoring area.
And a total of three connecting pipes 25 for connecting the suction pipes 24,
26 and (introduction or one depending on the number of suction pipes 24) and an introduction pipe 27 for connecting the connection pipes 25 and 26 to the detection chamber 23. This piping configuration is an optimal method for a monitoring area of 150 square meters to 200 square meters.

The suction pipe 24 is a pipe made of polyvinyl chloride or the like provided with a sampling hole (not shown) every 1 m. For example, if the diameter of the sampling hole is 2 mm, the inner diameter of the pipe is 25 mm.
mm pipe (end part opening diameter is 6mm) up to about 5
The length can be 0 m (the suction speed of the suction pump 21 is about 5 to 7 m / s). Further, the interval between the suction pipes 24 is preferably about 2 m to 5 m.

A connecting pipe 2 is provided at a central portion 24a of the suction pipe 24.
5 (in the case of one suction pipe 24, the direct introduction pipe 27) is connected to the end part 25a, and the odor in the monitoring area is collected through a sampling hole (not shown) and the central part 24 of the suction pipe 24 is collected.
a and is introduced into the connecting pipe 25. Accordingly, there is no difference in the detection time of the odor at both ends of the suction pipe 24, and it is possible to perform uniform monitoring. Therefore, the position of the suction tube 24 to which the end portion 25a of the connecting tube 25 is connected is preferably strictly and exactly at the center, but there is no problem even if the position is shifted for convenience of installation.

The connecting pipe 25 is a pipe made of PVC or the like having the same diameter as the suction pipe 24. Both ends 25 a of the connecting pipe 25 are connected to the central portions 24 a of the two suction pipes 24, respectively. In the central portion 25b, an end portion 26a of a connecting tube 26 connecting two connecting tubes 25 connecting the suction tubes 24 (in the case of one connecting tube 25, a direct introduction tube 27).
The odor sampled by the two suction pipes 24 is introduced into the connection pipe 26 through the suction pipe 24 and the center part 24a of the connection pipe 24 via the end part 25a of the connection pipe 25. Therefore, there is no difference in the detection time of the odor sampled by the two suction pipes 24, and it is possible to perform uniform monitoring. Therefore, it is preferable that the position of the connecting pipe 25 to which the end portion 26a of the connecting pipe 26 is connected is exactly strictly at the center, but there is no problem even if it is shifted for convenience of installation.

The connecting pipe 26 is a pipe made of PVC or the like having the same diameter as the suction pipe 24. Both ends 26 a of the connecting pipe 26 are connected to the central portions 25 a of the two connecting pipes 25, respectively. The central portion 26b is connected to an end portion 27a of an introduction tube 27 that connects between the connection tube 26 and the detection chamber 23,
The odor sampled by the suction pipes 24 is connected to the connection pipe 25.
Are converged into one at a central portion 26 b of the connecting pipe 26 and introduced into the introducing pipe 27. Therefore, four suction pipes 2
There is no difference in the detection time of the odor sampled by No. 4 and uniform monitoring is possible. Therefore, the introduction pipe 27
It is preferable that the position of the connecting pipe 26 to which the end portion 27a is connected is strictly and exactly at the center, but there is no problem even if it is shifted for convenience of installation.

The introduction pipe 27 is a pipe made of PVC or the like having the same diameter as that of the connection pipe 26, and its end 27 a is connected to the connection pipe 26.
(The connecting pipe 25 when the number of connecting pipes 25 is one, and the suction pipe 24 when the number of the suction pipes 24 is one), and a base end 27b thereof is connected to the detection chamber 23, respectively.
An odor sensor 1 (FIG. 1) is provided therein. And 4
The odor sampled by the suction pipes 24 is
6 converges at the central portion 26 b, so that the odor is directly introduced into the detection chamber 23 via the introduction pipe 27. Accordingly, there is no difference in the time until the four suction pipes 24 are introduced into the sampled odor detection chamber 23, and the entire monitoring area can be uniformly monitored.

FIG. 3 is a schematic perspective view showing an installation state of the first embodiment in which the piping system shown in FIG. 2 is disposed in a plenum chamber (behind the ceiling used for air conditioning) as an example. , FIG. 4 is a plan view of the plenum chamber viewed from above, and FIGS. 5 and 6 are side views of the plenum chamber viewed from different angles.

The 15 m × 10 m room 40 has a height of 2.7 m, and a plenum chamber 41 having a height of 1.2 m is provided above the room 40. In the plenum chamber 41, four suction pipes 24 each having a length of 6 m are provided at intervals of 3.5 m. In the arrangement of the suction pipe 24, the sampling hole (not shown) of the suction pipe 24 exists within about 2 m in almost all the area in the plenum chamber 41, and the odor sampled in the suction pipe 24 is Until pulled out from 41 (point P
Up to) and 15.25 m at the longest and 12.25 m at the shortest as a planar distance excluding the rising portion.

FIG. 7 shows the plenum chamber 4 shown in FIG.
FIG. 6 is a plan view showing an installation state according to a second embodiment with respect to FIG.

In this embodiment, two suction pipes 24d having a length of 11 m are provided in the plenum chamber 41 at intervals of 4.5 m. In the arrangement of the suction pipe 24d, the sampling hole (not shown) of the suction pipe 24d is present within about 2.3 m in most of the area inside the plenum chamber 41 (a disadvantage compared to the first embodiment). Tube 2
The odor sampled at 4d is taken out from the plenum chamber 41 (point P) as compared with the first embodiment.
Up to) and a maximum distance of 12.75 m and a minimum of 7.25 m as a planar distance excluding the rising portion. Therefore, the longest and shortest distances are shorter, but the difference in detection time depending on the location is larger.

FIG. 8 is a plan view showing an installation state of the plenum chamber 41 shown in FIG. 3 according to the third embodiment, similarly to FIG. 7, and FIG. 9 is a side view thereof.

In this embodiment, in the first embodiment, it is necessary to provide pipes vertically and horizontally in the plenum chamber 41 (similarly in the second embodiment). In comparison, the space for installing other equipment in the plenum chamber 41 can be sufficiently maintained.

In this embodiment, as in the first embodiment, the suction pipe 24 having a length of 6 m is provided in the plenum chamber 41.
Are provided at intervals of 3.5 m.
d is provided at the end of the suction pipe 24, unlike the first embodiment. In this embodiment, if there is a space for installing the suction pipe 24, the other pipes do not pass through the central portion, so that the space can be secured when installing other facilities, which is advantageous.

Further, as compared with the first embodiment, the plane distance is 15.25 m at the longest and 9.25 m at the shortest until the member is pulled out from the plenum chamber 41 (to the point P) without the rising portion. The difference between the detection times increases.

In each of the above embodiments, the suction pipe 24
For convenience of connecting and inhaling evenly, the number is one,
Two, four, eight, etc. are preferable, but the number is not limited, and three or six may be used. Further, the intervals between the sampling holes (not shown) of the suction pipe 24 do not necessarily have to be equal, and even if there is a deviation depending on the location, the suction speed may not be affected. Similarly, the arrangement of the plurality of suction pipes 24 does not necessarily need to be arranged in parallel, and columns or the like may be avoided, and differences in length, deviation of intervals, use of curved pipes, and other facilities in the room. Deformation according to the situation may be performed.

[0026]

According to the present invention, in order to detect odors even in a wide monitoring area, a plurality of suction pipes provided with openings for sampling odors at predetermined intervals are provided.
A detection chamber in which an odor sensor for detecting odor is arranged, and an introduction pipe connected to the detection chamber from a connection pipe connected to each of the suction pipes, and the plurality of suction pipes are The connection pipes are arranged at predetermined intervals to uniformly monitor the monitoring area, and the connection pipe is a connection pipe connecting two central portions of the plurality of suction pipes, and one of the suction pipes is one of the plurality of suction pipes. A connecting pipe connecting the central part of the connecting pipe and a central part of the connecting pipe, and a connecting pipe connecting two central parts of the connecting pipes selectively connected to the introducing pipe, There is no deviation in the arrival time to the detection chamber on both sides of each suction pipe. Then, it is possible to equalize the time from sampling the odor to detection.

Also, a plurality of suction pipes provided with openings for sampling odor at predetermined intervals, a detection chamber in which an odor sensor for detecting odor is disposed,
And an introduction pipe connected to the detection chamber from a connection pipe connected to each of the suction pipes, and the plurality of suction pipes are arranged at predetermined intervals to uniformly monitor a monitoring area. , The connecting pipe connects two end portions of the plurality of suction pipes, and one of the plurality of suction pipes.
A connecting pipe connecting the end portion of the book and a central portion of the connecting pipe; and a connecting pipe connecting two central portions of the connecting pipes, a plurality of which are selectively combined and connected to the introduction pipe. In addition, the arrival time from each suction pipe to the detection chamber is not biased, and the connecting pipe can be arranged at one end of the monitoring area, so that the degree of freedom with other equipment in the central portion can be secured. It is possible.

[Brief description of the drawings]

FIG. 1 is a block diagram schematically showing a configuration of an odor detection device to which the present invention is applied.

FIG. 2 is a piping system diagram showing a piping system of a sampling pipe.

FIG. 3 is a perspective view showing a first embodiment arranged in a plenum chamber.

FIG. 4 is a plan view of FIG. 3;

FIG. 5 is a side view of FIG. 3;

FIG. 6 is a side view at an angle different from that of FIG. 5;

FIG. 7 is a perspective view showing a second embodiment disposed in a plenum chamber, similarly to FIG. 4;

FIG. 8 is a perspective view showing a third embodiment disposed in a plenum chamber, similarly to FIG. 4;

FIG. 9 is a side view of FIG. 8;

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Odor sensor 22 Sampling pipe 23 Detection chamber 24 Suction pipe 25, 26 Connecting pipe 27 Inlet pipe

Continuation of the front page (58) Field surveyed (Int. Cl. ⁷ , DB name) A62C 27/00-39/00 G08B 17/00-17/12 G08B 23/00-31/00

Claims (2)

(57) [Claims] 1. A plurality of suction pipes provided with openings for sampling odor at predetermined intervals, a detection chamber in which an odor sensor for detecting odor is arranged, and a connection connected to each of the suction pipes. An inlet pipe connected to the detection chamber from a pipe, wherein the plurality of suction pipes are arranged at predetermined intervals to uniformly monitor a monitoring area, and the connection pipe is A connecting pipe connecting two central parts of the suction pipes, a connecting pipe connecting one central part of the plurality of suction pipes and a central part of the connecting pipes, and two of the connecting pipes; An odor detection device, wherein a plurality of connection pipes are selectively combined from the connection pipes connecting the central portions of the suction pipes and connected to the introduction pipe, and the time from each of the suction pipes to the detection chamber is equalized. 2. A plurality of suction pipes provided with openings for sampling odor at predetermined intervals, a detection chamber in which an odor sensor for detecting odor is arranged, and a connection connected to each of the suction pipes. An inlet pipe connected to the detection chamber from a pipe, wherein the plurality of suction pipes are arranged at predetermined intervals to uniformly monitor a monitoring area, and the connection pipe is A connecting pipe connecting two end portions of the suction pipe, a connecting pipe connecting one end portion of the plurality of suction pipes and a central portion of the connecting pipe, and two of the connecting pipes; An odor detection device, wherein a plurality of connection pipes are selectively combined from the connection pipes connecting the central portions of the suction pipes and connected to the introduction pipe, and the time from each of the suction pipes to the detection chamber is equalized.