JP3198953B2 - Gas collection device - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a gas collecting apparatus for collecting toxic gas in the air and analyzing the concentration of the toxic gas, and more particularly to a gas collecting apparatus capable of easily performing gas collection while achieving downsizing. The present invention relates to a gas trapping device capable of producing gas.

[0002]

2. Description of the Related Art In recent years, gases harmful to the human body such as formaldehyde generated from new building materials have become a serious problem. For this reason, there has been an increasing demand for collecting gas in the air and analyzing the gas concentration. I have. Conventionally, as a method of collecting gas, there is a method of concentrating and collecting a trace amount of gas. This method uses a collecting container, an air pump, a desiccant, a flow meter, a volume flow meter (integrated flow meter), and the like to use a gas collecting device. Air is sucked in while measuring the amount of suction in the collected liquid at the investigation site, and the target gas in the air is dissolved in the collected liquid by continuously bubbling in the liquid to concentrate and collect. I do. Then, the collected liquid is analyzed by a chemical method to determine the concentration of gas components in the solution, which is converted into the concentration in the air introduced by suction.

[0003]

However, in such a conventional gas trapping apparatus, the air flow rate (flow velocity) is appropriately controlled in order to keep the gas trapping rate constant. The movement of the gas volume meter is measured by a stopwatch, or an instantaneous flowmeter is connected, and the flow rate is frequently adjusted by a needle valve.

For this reason, in the conventional gas collecting apparatus, it takes a great deal of time to adjust the flow rate and read the amount of suction, and the gas volume meter is constructed as a precision instrument, and is expensive and requires careful attention in its handling. Degree is needed. In addition, there is a problem that the collection equipment becomes large-scale, and the transportation of the equipment and the movement of the investigation place are difficult, and the installation adjustment is troublesome, and the gas collection work becomes extremely difficult. .

[0005] In view of the above-mentioned problems, the present invention provides a gas collecting apparatus which can be made compact by using simple and inexpensive equipment and which can easily perform a gas collecting operation without skill. It is intended to provide a collector.

[0006]

In order to achieve the above object, a gas collecting apparatus according to the present invention according to a first aspect of the present invention includes a collecting container for storing a collecting liquid on a suction side of a portable air pump and a collecting container. sequentially setting a drying means for drying the air passing through the collection vessel
Passing through the collection container on the exhaust side of the air pump.
A container as a volume meter is provided for storing the exhaust air, and an exhaust passage connected to the container is connected to the intake side of the air pump via switching means. At the switching position of the switching means , the exhaust air in the container is communicated with the exhaust side of the air pump.
To automatically evacuated by suction with a pump, to the exhaust passage and configured to the atmosphere along with communicating the container to the intake side of the <br/> air pump.

Further, the gas collecting apparatus according to the present invention is provided with a pressure sensor for detecting the pressure in the housing, and the pressure sensor and a switch of the air pump are operated in conjunction with each other, so that the pressure in the housing is controlled. When the pressure reaches a predetermined pressure, the air pump is automatically stopped.

Further, in the gas collecting apparatus according to the present invention, the opening of the collecting container is closed with an elastic cap, and an air inlet pipe for taking in air and the inside of the collecting container are suctioned. The suction pipes connected to the sides are formed by needle-shaped capillaries, respectively, and these air introduction pipes and suction pipes are inserted into and attached to the elastic cap. Also,
The gas collection device according to the present invention as set forth in claim 4, wherein the collection container
Is used as a colorimetric tube after gas collection . Claims
The gas collecting device of the present invention shown in FIG.
And a main storage box for storing dry batteries
The switching means and the pressure cell are provided on the side of the main storage box.
A sub-storage box for storing the sensor, the drying means,
The collection container is attached to the side of the box,
A lever of the switching means is provided on a side surface of the auxiliary storage box.
At the same time, there is a
It is characterized in that

The operation of the gas collecting apparatus of the present invention having the above configuration will be described below. By driving the air pump, the air at the measurement location is taken into the collection container, passes through the collection liquid in the collection container, and then passes through the drying means. The air sucked by the air pump and discharged from the air pump is stored in the container.
Then, the body of the exhaust air in which the container has passed through the collection container
It is used as an accumulator, and when the container is filled, gas collection is completed and the air pump is stopped. And 1
By setting the switching means to the switching position after the end of the collection, the air in the container is sucked by the air pump.
Then, the air is automatically exhausted from the exhaust passage to the atmosphere, and the container can be emptied to prepare for the next collection. Therefore, the configuration of the gas trapping device can be significantly simplified, reduced in cost and reduced in size.

Further, in the gas collecting apparatus according to the present invention, the pressure sensor of the housing is linked with a switch of the air pump, and the air pump is automatically stopped when the pressure in the housing reaches a predetermined pressure. Therefore, the end point of collection is automatically determined.

Further, in the gas collecting apparatus according to a third aspect of the present invention, the opening of the collecting container is closed with an elastic cap, and an air inlet pipe for taking in air and the inside of the collecting container are connected to the suction side. Since the suction pipes are formed by needle-shaped capillaries, and the air introduction pipe and the suction pipe are inserted and attached to the elastic cap, it is extremely easy to set and exchange the collection container, and also, to introduce the air introduction pipe. Capillaries can also serve as airflow resistance tubes,
The air flow is stabilized. In addition, the gas collecting device of claim 4
The device is used as a colorimetric tube after collecting the gas in the collecting container.
Air mixed in the collected liquid in the collection container
Can be inspected as a colorimetric tube using the collection container.
Therefore, transfer the collected liquid or use a part of the collected liquid for analysis.
Separation work is not required, improving the operability of chemical analysis.
You . Further, in the gas collecting device according to claim 5, all the constituent parts can be integrated.
It is possible to physically assemble and collectively assemble. Obedience
Therefore, the gas collection device assembled in this way is portable.
It is highly portable and portable, eliminating the need for equipment adjustments.
The collection of air at any place can be easily performed. This
Therefore, handling is simplified and no skill is required
Can be used by anyone. Therefore, the gas collecting device
Is significantly simplified in construction, and can be made cheaper and smaller.
I can .

[0012]

Embodiments of the present invention will be described below in detail with reference to the accompanying drawings. 1 to 3 show one embodiment of the gas collecting device of the present invention, FIG. 1 is an overall circuit diagram of the gas collecting circuit, and FIG. 2 is a diagram showing an operation state of a switching cock provided in the gas collecting circuit. FIG. 3 is a perspective view showing an assembled state of the gas collecting device.

That is, the gas collecting apparatus 10 of the present embodiment is
As shown in FIG. 1, a portable air pump 12 is provided, and the air in the air is taken in by sucking air by the air pump 12. The above air pump 1
Numeral 2 is portable by being driven by a battery such as a dry battery. On the intake side 12a of the air pump 12, an impinger 14 as a collecting container and a desiccant tube 16 as a drying means also serving as a filter are sequentially provided. A gas bag 18 is provided on the exhaust side 12b of the air pump 12 to store exhaust air, and the gas bag 18 is used as a gas volume meter. On the downstream side of the desiccant tube 16, there is provided a check valve 20 that allows only the flow of air toward the air pump 12.

The impinger 14 is formed of a test tube with a bottomed cylindrical glass tube, and the upper end opening is closed with a rubber cap 22. The impinger 14 is provided with an air inlet tube 24 for taking in air and a suction tube 26 connecting the inside of the impinger 14 to the suction side 12a. Formed by the metal capillaries. The air introduction tube 24 and the suction tube 26 formed of a metal capillary are:
By being inserted into the rubber cap 22, the respective needle-like tips 24a and 26a are inserted into the impinger 14. In addition, the impinger 14
A predetermined amount of a collecting liquid 28 is injected into the collecting liquid 28, and a distal end 24a of the air introduction pipe 24 is immersed in the collecting liquid 28, and a distal end 26a of the suction pipe 26 is It is arranged above the liquid level.

The air pump 12 and the gas bag 18
A pressure sensor 30 is provided between the pressure sensor and the pressure sensor 30, and the pressure in the gas bag 18 is detected by the pressure sensor 30. The pressure sensor 30 operates in conjunction with a switch of the air pump 12, and stops the air pump 12 when the gas bag 18 is filled with air.

A switching cock 34 as switching means is provided in the exhaust passage 32 communicating with the gas bag 18 on the downstream side of the pressure sensor 30. The switching cock 34
2A connects the gas bag 18 to the exhaust passage 32 of the air pump 12 at the normal position shown in FIG.
The gas bag 18 is connected to the intake passage 36 which bypasses the impinger 14 at the switching position shown in FIG. In the switching position of the switching cock 34, the exhaust passage 32 communicates with the atmosphere opening passage 38.

The gas collecting device 10 having the above-mentioned structure is assembled as a compact structure as shown in FIG. That is, on the side surface 40a on the front side of the main storage box 40 for storing the air pump 12 and a dry battery serving as a driving source, a sub-storage box 42 for storing the switching cock 34 and the pressure sensor 30 and the like is approximately a half space. Mounted with A lever 44 of the switching cock 34 protrudes from a side surface 42a on the front side of the sub-storage box 42, and a mounting opening 46 for the gas bag 18 is provided on a side surface 42b. Two desiccant tubes 16, 16 are attached to the side surface 40b on the side of the main storage box 40, and the sub storage box 42 is mounted on the front side surface 40a of the main storage box 40. The impinger 14 is mounted on the side. Incidentally, the gas collecting device 10 is formed to have a size of about 10 cm in depth, 12 cm in width and 18 cm in height.

With the above configuration, in the gas collecting apparatus 10 of the present embodiment, by driving the air pump 12, the air at the measuring place is supplied from the air introducing pipe 24 to the impinger 14.
After the collected liquid 28 of the impinger 14 is bubbled and passed, it is passed through the desiccant tube 16 and sucked by the air pump 12. The air discharged from the air pump 12 is stored in a gas bag 18. Then, the gas bag 18 is used as a volume meter, and when the gas bag 18 is filled, the pressure sensor 30 operates to stop the air pump 12, and the gas collection is completed. At this time, gas in the air is mixed into the collected liquid 28 of the impinger 14, and the impinger 14 can be inspected as a reaction vessel and a colorimetric tube.

By setting the switching cock 34 to the switching position shown in FIG. 2B after one collection, the gas bag 18 is connected to the intake side of the air pump 12. The air in the gas bag 18 is sucked by the air pump 12 and automatically exhausted, and the gas bag 18 can be emptied to prepare for the next collection.

As described above, in this embodiment, the gas bag 18 is used instead of the gas volume meter.
Can be a plastic bag-shaped container. Therefore, the gas bag 18 can be folded and carried, so that it is extremely lightweight, and the gas bag 18 can be externally attached, and the suction amount can be arbitrarily changed by changing the size of the bag 18.

The pressure sensor 30 can be constituted by a microswitch, a rubber pressure receiving portion, a plastic tube, or the like. When the air is filled in the gas bag 18 and the air pressure in the bag 18 slightly increases, the pressure is increased. Thus, a configuration in which the microswitch operates can be achieved.
Therefore, the amount of one suction is determined to be constant by the capacity of the gas bag 18, so that it is not necessary to read the gas volume meter and operate the switch while looking at the scale as in the conventional case. For this reason, the gas volume meter is conventionally configured as a precision instrument, and is expensive and requires sufficient care in handling. However, in the present embodiment, such consideration is completely unnecessary. In addition, since the gas bag 18 is commercially available in various sizes as a gas container used for gas analysis, its volume can be measured in advance and used.

By the way, in the gas collecting device 10, 1
After the last collection, to prepare for the next collection,
Although it is necessary to discharge the air in the gas bag 18, the flow path of the collection air pump 12 is reversed by switching of the switching cock 34 built in the main body, and the air in the air is automatically exhausted with the gas bag 18 attached. it can. Therefore, the operability and the workability are excellent.
For example, by changing a three-way cock made of polyethylene into an irregular four-way cock, the flow path can be switched with one touch by one switching operation. The switching cock 34 is interlocked with a switch (not shown) that changes the driving voltage of the air pump 12, and the switching of the switching cock 34 causes the air pump 12 to operate at a low speed during gas collection and at a high speed during exhaust. It is a mechanism that is done.

Here, the concentration ratio of the gas component in the collected liquid 28 collected by the impinger 14 is determined by the ratio between the amount of collected liquid and the amount of sucked air. Impinger 1
4 is made smaller so that it can be concentrated and collected with a small amount of collected liquid (1 to 3 ml). For this reason, even if the amount of air suction is small, a high concentration can be obtained.
8 may be as small as 1 to 5 liters. Also, when performing colorimetric analysis as described above, the impinger 14 can be used as it is as a reaction vessel and a colorimetric tube.
There is no need to transfer the collected liquid 28 or to fractionate a part of the collected liquid 28 for analysis, thereby improving the operability of chemical analysis. Here, colorimetric analysis refers to an analysis in which a reagent is added to a gas-collected solution to develop a specific color through a chemical reaction, and the concentration of the color is measured by transmitting light to quantify the gas component concentration. Is the way. In addition, a commercially available small test tube made of glass can be used as the impinger 14, and it is easier to handle and extremely inexpensive as compared with a conventional impinger.

A rubber cap 22 is attached to the impinger 14, and an air introduction pipe 24 attached to the rubber cap 22 is provided.
Since a metal capillary in the form of a large injection needle is used for the suction pipe 26 and the suction pipe 26, the air introduction pipe 24 and the suction pipe 2
6 can secure an air flow path only by inserting it into the rubber cap 22. The impinger 14
Can be operated with the rubber cap 22 attached,
Even if the impinger 14 is accidentally knocked down, the collected liquid 28
No spills. Further, the collection liquid 28 and the reagents for the reaction can be injected into the impinger 14 with a syringe in a state in which a cap is provided, so that operability and safety are improved. The air introduction pipe 24 and the suction pipe 2
6 has a small inner diameter by being formed as a capillary, reduces air bubbles flowing into the collection liquid 28 from the tip of the air introduction pipe 24, improves the solubility of gas components, and improves the collection efficiency. .

Further, when the air introduction pipe 24 and the suction pipe 26 are withdrawn after the gas collection, the pressure inside the impinger 14 is slightly reduced, so that the collected liquid 28 remaining in the air introduction pipe 24 is reduced. Is sucked into the impinger 14, so that the cleaning of the air introduction pipe 24 and the suction pipe 26 becomes unnecessary. Further, contamination by the residual liquid can be prevented. Further, the air introduction pipe 24 and the suction pipe 26
The tip of the needle has a closed needle shape to facilitate insertion into the rubber cap 22, and the air outflow and inlet ports are needle-like tips 24a, 26a.
By providing a side hole in the vicinity, it is possible to prevent blockage due to rubber dust.

The air introduction pipe 24 formed as a metal capillary also functions as a resistance pipe for the air flow, so that the air flow rate is stabilized. For this reason, the air flow rate (flow velocity) is appropriately controlled to stabilize the gas collection rate,
Gas inspection accuracy can be improved. Further, by selecting the length and thickness of the air introduction pipe 24 and the suction pipe 26,
The flow rate can be controlled almost without being affected by the capacity of the air pump 12, and since the flow rate is stabilized, the monitoring by the instantaneous flow meter and the needle valve, which are conventionally required, can be eliminated, and the flow rate can be adjusted. Collection work can be performed without worry. The air introduction pipe 24
Also, the case where the suction tube 26 is formed as a metal capillary is disclosed. However, the present invention is not limited thereto, and the suction tube 26 may be formed as a glass or plastic capillary.

As described above, the gas collecting apparatus 10 of the present embodiment
Is a simple configuration in which the impinger 14 and the desiccant tube 16 are provided on the intake side of the portable air pump 12 and the gas bag 18 is provided on the exhaust side. Parts can be assembled compactly as a whole and assembled. Therefore, the gas collecting device 10 assembled in this manner is portable and highly portable, and does not require assembly and adjustment of equipment, and can easily collect air at an arbitrary place. For this reason, the handling is simplified and can be used by anyone without requiring skill. In this case, the height can be easily adjusted by setting the camera on a camera tripod or the like, and the space is not required. Therefore, the configuration of the gas collecting device 10 is significantly simplified, and the gas collecting device 10 can be made inexpensive and compact.

[0028]

As described above, in the gas collecting apparatus according to the first aspect of the present invention, the air in the measuring place is taken into the collecting container by driving the air pump, and the collecting container is operated. After passing through the collected liquid, the air passes through the drying means and is sucked into the air pump, and the exhaust gas discharged from the air pump is exhausted.
Since the air is stored in the container, the container is trapped.
It can be used as a volume meter for the exhaust air that has passed through the collection container.
it can. Furthermore, by setting the switching means to the switching position after one collection, the air in the container is sucked by the air pump and automatically exhausted from the exhaust passage to the atmosphere.
The container can be emptied and ready for the next collection. Therefore, since the configuration of the gas collecting device can be significantly simplified, the cost can be reduced, and the size can be reduced, the operability is significantly improved, and the gas collecting device can be handled without requiring skill.

Further, in the gas collecting apparatus according to a second aspect of the present invention, the pressure sensor of the housing is linked with the switch of the air pump, and when the pressure in the housing reaches a predetermined pressure, the pressure of the air pump is reduced. Is automatically stopped, so that the end point of collection can be automatically determined, so that a complicated and skilled gas suction operation as in the related art can be omitted.

Further, in the gas collecting device according to a third aspect of the present invention, the opening of the collecting container is closed with an elastic cap, the air introducing pipe for taking in air and the inside of the collecting container. The suction pipes connected to the suction side are formed by needle-shaped capillaries, respectively, and these air introduction pipes and suction pipes are inserted and attached to the elastic caps, so that setting and replacement of the collection container becomes extremely easy. In addition, since the capillary for introducing air can also serve as a resistance tube for air flow, the air flow can be stabilized and the inspection accuracy can be improved. Also, claim 4 of the present invention
In the gas collecting device shown in (1), the collected liquid in the collecting container is
Inspection of air that has entered the collection container as a colorimetric tube
Transfer of the collected liquid or part of the collected liquid
The work of separating samples for analysis becomes unnecessary,
Operability can be improved . Claims of the present invention
In the gas collecting device shown in FIG.
It is possible to assemble together in a compact manner. Follow
The gas collection device assembled in this way is portable
It is highly portable and does not require assembly adjustment of equipment.
It is possible to easily collect air at a desired place. this
Because of the simplicity of handling, no one needs skill
Can also be used for Therefore, the gas collecting device
The structure is significantly simplified, and it is possible to reduce the cost and size.
I can .

[Brief description of the drawings]

FIG. 1 is an overall circuit diagram of a gas collecting circuit showing one embodiment of a gas collecting device of the present invention.

FIG. 2 is an explanatory diagram of an operation state of a switching unit provided in the gas collecting circuit according to the embodiment of the present invention.

FIG. 3 is a perspective view showing an assembled state of the gas collecting device according to the embodiment of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 10 Gas collection device 12 Air pump 12a Intake side 12b Exhaust side 14 Impinger 16 Desiccant tube 18 Gas bag 22 Rubber cap 24 Air introduction pipe 26 Suction pipe 28 Collected liquid 30 Pressure sensor 34 Switching cock

──────────────────────────────────────────────────続 き Continuation of the front page (56) References JP-A-56-117140 (JP, A) JP-A-1-203969 (JP, A) JP-A-5-118971 (JP, A) JP-A 52-117 15391 (JP, A) JP-A 1-104545 (JP, U) JP-A 64-34544 (JP, U) (58) Fields investigated (Int. Cl. ⁷ , DB name) G01N 1/00 101 G01N 1/22 G01N 31/00-31/22

Claims (5)

(57) [Claims] To 1. A suction side of the air pump for mobile, provided with a drying means for drying the air passing through the collection vessel and the collecting vessel was pooled collecting liquid sequentially, the exhaust side of the air pump
A volume meter for storing exhaust air passing through the collection container.
Is provided, and an exhaust passage connected to the container is connected to the intake side of the air pump via a switching unit,
While the該収condition in said switching means is normally positioned to communicate with the exhaust side of the air pump, the switching position of said switching means,該収
The exhaust air inside the container is sucked by the air pump and automatically exhausted.
To the gas collecting device, wherein said exhaust passage to cause the atmosphere with communicating the container to the intake side of the air pump. 2. A pressure sensor for detecting a pressure in the housing is provided, and the pressure sensor and a switch of the air pump are interlocked, and the air pump is automatically stopped when the pressure in the housing reaches a predetermined pressure. The gas collection device according to claim 1, wherein: 3. The collection container has an opening closed by an elastic cap, and an air introduction pipe for taking in air and a suction pipe connecting the inside of the collection container to the suction side are each formed with a needle-shaped capillary. The gas collection device according to claim 1, wherein the gas collection device is formed, and the air introduction tube and the suction tube are inserted into and attached to the elastic cap. 4. The collection container is a colorimetric tube after collecting gas.
4. The method according to claim 1, wherein
Item 2. A gas collecting device according to item 1 . 5. The air pump and a drive source thereof
Equipped with a main storage box for storing dry batteries, and on the side of the main storage box
Is a sub-unit that houses the switching means and the pressure sensor.
A storage box, the drying means, and a side storage box.
And the collection container is mounted on the side of the sub-storage box.
The lever of the switching means is protruded and folded
A foldable mounting opening for the container is provided.
The gas collecting device according to any one of claims 1 to 4,
Place .