JP4389318B2 - Draft chamber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a draft chamber having a hood (experimental box) for handling chemical substances.
[0002]
[Prior art]
FIG. 5 is a side view showing an example of a conventional draft chamber.
[0003]
Conventionally, when an experiment is performed in this type of draft chamber 1, as shown in FIG. 5, the air in the working chamber W is always taken into the hood 3 and the hood 3 together with dangerous substances such as harmful gases generated in the hood 3. By discharging to the outside, the experimenter was protected from this dangerous substance.
[0004]
[Problems to be solved by the invention]
However, since the air in the work chamber W flows into the hood 3 near the experimenter, the hood 3 cannot be maintained in a clean environment when the atmosphere of the work chamber W is not clean. Therefore, in order for the experimenter to continue the experiment safely in a clean work environment, there is a disadvantage that a large-scale air conditioning facility (not shown) must be provided in the work room W to keep the atmosphere clean. .
[0005]
In view of such circumstances, the present invention can protect an experimenter from a hazardous substance and can always engage in an experiment in a clean work environment without worrying about air conditioning equipment in a work room. An object is to provide a draft chamber.
[0006]
[Means for Solving the Problems]
In the present invention, attention is paid to adopting a front exhaust structure with a double glass door so as to directly take in air for exhausting dangerous substances in the hood from the outside of the working chamber.
[0007]
That is, according to the first aspect of the present invention, in a draft chamber having a hood installed in a work chamber, an intake port is formed in the hood so as to communicate with the outside of the work chamber, and a filter is provided in the intake port. An exhaust device for forming a work window on the front surface of the hood, attaching a double glass door to the work window so as to be movable up and down, and discharging the air in the hood to the outside of the hood through the double glass door. Provided and configured.
[0008]
By adopting such a configuration, after the air outside the working chamber is purified by a filter and flows into the hood, the circulating airflow discharged outside the hood through the double glass door together with the dangerous substances in the hood As a result, the air in the working chamber hardly takes a piggyback on the circulating airflow, and therefore it is possible to proceed with the experimental work without being influenced by the indoor environment of the working chamber.
[0009]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, embodiments of the present invention will be described with reference to the drawings.
[0010]
1 is a side view showing an embodiment of a draft chamber according to the present invention, FIG. 2 is a view showing a double glass door of the draft chamber of FIG. 1, (a) is a perspective view thereof, and (b) is a perspective view thereof. FIG. 3 is a side view showing the usage state of the draft chamber shown in FIG. 1 in a half-open state, and FIG. 4 is a usage situation of the draft chamber shown in FIG. 1 in a fully-open state. FIG.
[0011]
As shown in FIG. 1, the draft chamber 1 includes an experimental table 2 installed in a work room W, and a hood 3 is mounted on the experimental table 2. An intake port 31 is formed on the upper surface of the hood 3 so as to communicate with the outside of the working chamber W, and the filter 5 is attached to the intake port 31. A work window 32 is formed on the front surface of the hood 3, and the double glass door 6 is attached to the work window 32 so as to be movable up and down.
[0012]
That is, as shown in FIG. 2, the double glass door 6 has a front glass 61, and a rear glass 62 is erected in parallel at a predetermined interval behind the front glass 61. . Further, two side covers 63 and 64 are fixed to both sides of the front glass 61 and the back glass 62 so as to connect the both, and are surrounded by the front glass 61, the back glass 62, and the side covers 63 and 64. In this way, the air passage 65 is formed to communicate in the vertical direction. Here, the lower end portion of the front glass 61 protrudes slightly downward from the lower end portions of the rear glass 62 and the side covers 63 and 64, as shown in FIG. As shown in FIG. 2B, the double glass door 6 is mounted so as to be movable in the vertical direction along the guide members 4 and 4 respectively provided upright on both sides of the work window 32 of the hood 3. ing.
[0013]
As shown in FIG. 1, an exhaust device 8 is provided above the double glass door 6, and the exhaust device 8 includes an exhaust box 7, an exhaust fan 9, and a duct 10. Here, the exhaust box 7 is installed in communication with the air passage 65 of the double glass door 6, and an exhaust fan 9 is provided in the exhaust box 7. Further, a duct 10 is connected to the exhaust box 7, and the duct 10 communicates with the outside of the work chamber W.
[0014]
Since the draft chamber 1 has the above-described configuration, when an experiment is performed in the draft chamber 1, the exhaust fan 9 is rotated to drive the exhaust device 8, and as shown in FIG. The experimenter in W lifts the double glass door 6 to open the work window 32 and inserts both hands from there to execute a predetermined experiment work in the hood 3. Then, the air outside the working chamber W flows into the hood 3 through the filter 5, reaches the exhaust box 7 through the ventilation path 65 of the double glass door 6, and is exhausted from the duct 10 to the outside of the working chamber W. A circulating airflow is generated. At this time, since the work window 32 is in an open state, the air in the work chamber W joins and evacuates the circulating airflow through the air passage 65 of the double glass door 6. The amount of air taken in from outside is small.
[0015]
Therefore, when a dangerous substance such as harmful gas is generated in the hood 3 during the experiment, it is discharged outside the working room W by riding on this circulating air current, and the experimenter sucks the dangerous substance. Can be avoided. In addition, since most of the air for discharging the dangerous substances generated in the hood 3 is purified and supplied from the outside of the work chamber W by the filter 5, the air is irrelevant to the indoor environment of the work chamber W. The inside of the hood 3 can be maintained in a clean environment. As a result, it is possible for an experimenter to always participate in an experiment in a clean work environment without providing an air conditioning facility in the work room W, and the safety is excellent.
[0016]
Here, the degree of opening of the work window 32 at the time of the experiment is determined according to the level of toxicity of the dangerous substance generated by the experiment. That is, when this dangerous substance is not very toxic, as shown in FIG. 4, the double glass door 6 is raised to the highest position so that the work window 32 is fully opened so that the experimenter can easily work. . On the other hand, for experiments involving the generation of extremely toxic hazardous substances, safety is emphasized over the workability of the experimenter, and the double glass door 6 is lowered to the lowest position as shown in FIG. 32 is fully closed. At this time, the double glass door 6 has a lower end portion of the rear glass 62 shorter than the lower end portion of the front glass 61, and the inside of the hood 3 and the air passage 65 of the double glass door 6 are also in the fully closed state of the work window 32. Since they are in communication with each other, the above-described circulating airflow is not interrupted in the middle, and the dangerous substance discharging operation is performed without any trouble.
[0017]
In the above-described embodiment, the draft chamber 1 in which the intake port 31 is formed on the upper surface of the hood 3 has been described. However, the formation position of the intake port 31 is not limited to this and communicates with the outside of the work chamber W. As long as the intake port 31 is formed at a position other than the top surface of the hood 3 (for example, the side surface or the back surface of the hood 3).
[0018]
【The invention's effect】
As described above, according to the first aspect of the present invention, after the air outside the working chamber is purified by the filter and flows into the hood, it passes through the double glass door together with the dangerous substance in the hood. As a result, a circulating air flow is generated outside the hood, and the air in the working room is almost not piggybacked on this circulating air flow, so it is possible to proceed with the experiment without being influenced by the indoor environment of the working room. In addition to being able to protect the experimenter from dangerous substances, it is possible to provide a draft chamber capable of engaging in experiments safely in a clean work environment without providing air conditioning equipment in the work room.
[Brief description of the drawings]
FIG. 1 is a side view showing an embodiment of a draft chamber according to the present invention.
2 is a view showing a double glass door of the draft chamber of FIG. 1, wherein (a) is a perspective view thereof, (b) is a horizontal sectional view thereof, and (c) is a vertical sectional view thereof.
FIG. 3 is a side view showing a use state of the draft chamber shown in FIG. 1 in a half-open state.
4 is a side view showing a use state of the draft chamber shown in FIG. 1 in a fully opened state. FIG.
FIG. 5 is a side view showing an example of a conventional draft chamber.
[Explanation of symbols]
DESCRIPTION OF SYMBOLS 1 ... Draft chamber 3 ... Hood 5 ... Filter 6 ... Double glass door 8 ... Exhaust device 31 ... Intake port 32 ... Work window W ... Work room

Claims (1)

In a draft chamber having a hood installed in the working chamber,
Forming an inlet in the hood in communication with the outside of the working chamber;
A filter is installed at this air inlet,
Forming a working window on the front of the hood;
A double glass door is attached to this work window so that it can be raised and lowered.
A draft chamber comprising an exhaust device for discharging the air in the hood out of the hood through the double glass door.

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