JPH059080Y2 - - Google Patents

Description

[Detailed Description of the Invention] "Industrial Application Field" The present invention relates to a draft chamber installed in a chemical laboratory or the like.

``Prior Art'' Conventionally, as an embodiment of this type, there has been a single-sided draft chamber as shown in, for example, Japanese Utility Model Publication No. 58-32747.

That is, as shown in FIG. 5, this draft chamber includes a processing table 1, a processing chamber 2 provided above the processing table 1 with a closed ceiling, and an exhaust path located at the rear of the processing chamber. 3 and an exhaust chamber 5 integrally formed with an exhaust space 4 communicating with the upper end of the exhaust path and located above the processing chamber 2,
The exhaust path section 3 of the exhaust chamber has upper and lower cylindrical exhaust ports 6 and 7 that penetrate through the rear surface of the processing chamber and protrude into the processing chamber at its upper and lower parts, respectively, and is located at the upper part. A damper 8 for opening and closing the exhaust port 6 is provided, and the exhaust space 4 has an exhaust port 11 connected to an exhaust duct 10 for connecting the exhaust fan 9 on the ceiling thereof, and the This is a draft chamber having an inclined guide plate 12 that becomes lower toward the exhaust port.

``Problems to be solved by the invention'' In conventional draft chambers, light gases with low specific gravity are transported through the upper exhaust port 6 of the exhaust chamber 5, while heavy gases with high specific gravity are transported through the lower exhaust port 7 of the exhaust chamber 5. After that, the air exits the building through the exhaust air from the exhaust duct 10, but some of the moisture contained in the exhausted gas condenses into water droplets while being exhausted, and the air is discharged from the exhaust duct 10 and the exhaust gas. There is a drawback that the liquid flows down along the inner wall surface of the chamber 5 and directly flows out from the lower exhaust port 7 onto the upper surface 1a of the processing table 1, that is, onto the working surface inside the processing chamber 2. As a result, the work surface 1a was contaminated with water droplets, resulting in an undesirable situation.

Therefore, the object of the present invention is to provide a draft chamber that can solve these drawbacks.

"Means for solving the problem" The draft chamber of the present invention has a processing chamber and an exhaust chamber above the processing table, and the gas generated in the processing chamber is formed on the wall located on the rear side of the processing chamber. In the draft chamber that leads to the exhaust chamber through the upper and lower exhaust ports, the water droplets that flow down along the inner wall of the exhaust chamber to the lower part of the exhaust chamber below the lower exhaust port are temporarily collected. The present invention is characterized in that a water droplet accumulating portion is formed, and the water accumulated in the water droplet accumulating portion is discharged through a guide conduit to a water droplet outlet formed in the processing table.

Further, the guide conduit may be provided with an on-off valve such as a lock valve.

"Example" Examples will be described with reference to the drawings.

In FIGS. 1 to 4, reference numeral 20 denotes a box-shaped processing table, and a water droplet outlet 21 is formed at an appropriate position near the rear of a top plate 20a that serves as a work surface of the processing table 20. There is. An electric box is provided in this processing table 20, and
Water supply and drainage pipes, gas pipes, etc. will be installed.

Reference numeral 22 denotes a processing chamber provided above the processing table 20 in which various chemical experiments can be performed, and a vertically movable glass door 23 is provided at the open front portion of the processing chamber 22. 24 is a bypass member having an air supply port provided above the opening/closing door 23. Note that, as shown in the figure, a water tap 25, a gas tap 26, a lighting fixture 27, and the like are appropriately installed in the processing chamber 22.

Reference numeral 28 denotes an exhaust chamber provided in an overall inverted L-shape behind and above the processing chamber 22, and this exhaust chamber 28 includes an exhaust guide section 29 located at the rear of the processing chamber, and Exhaust spaces 3 each communicating with an exhaust duct 31 having a fan 30
It consists of 2.

33 is formed at the top of the vertical wall forming the exhaust guide portion 29 or the vertical wall plate 34 that partitions the processing chamber 22 and the exhaust chamber 28, and discharges light gas with low specific gravity generated within the processing chamber 22. The upper exhaust port 33 is opened and closed by an opening/closing tamper 35 suitably mounted on a vertical wall 34.

A lower exhaust port 36 is formed at the lower part of the vertical wall 34 and discharges heavy gas with a high specific gravity generated in the processing chamber 22. A water droplet reservoir part 37 is formed in the lower part of the part 29 to collect water droplets that have descended along the inner wall surface of the exhaust guide part 29.

38 is provided in a guide hole 41 formed at the bottom of the vertical wall 34 forming the water droplet reservoir 37;
This guide conduit guides the water accumulated in the water droplet reservoir 37 to the water droplet outlet 21 of the processing table 20 described above, and this guide conduit 38 is provided with an on-off valve 39 such as a stop valve or a stop valve.

The upper edge of the lower exhaust port 36 collects water droplets that have descended along the vertical wall 34 into the water droplet reservoir 3.
A guide wall 40 for guiding the user to 7 is provided in a protruding manner.

"Function" In the above configuration, when experimental processing is performed in the draft chamber, the opening/closing damper 35 is normally kept in the open position and the exhaust fan 20 is driven. Then, when experimental processing such as oxidative decomposition is performed using chemicals and samples in the processing chamber 22, gas is generated due to reaction production accompanying the experimental processing.
Among the generated gases, light gas with low specific gravity is discharged through the upper exhaust port 33 at the rear of the processing chamber 22, while heavy gas with high specific gravity is discharged through the lower exhaust port 3 at the rear of the processing chamber 22.
6 into the exhaust gas guide portion 29 of the exhaust chamber 28. The gas that has entered the exhaust guide section 29 rises, reaches the exhaust space 32, and is discharged to the outside of the building via the exhaust duct 31.

A part of the water contained in the exhausted gas condenses into water droplets during the exhausting process, travels down the inner wall surface of the exhaust duct 31 and the inner wall surface of the exhaust chamber 28, and descends to the guide wall 40. leading to.
The water droplets that have reached the guide wall 40 do not flow from the lower exhaust port 36 to the top plate 20a of the processing table 20, but are all guided to the water droplet reservoir 37 and flow down.
The water stored in the water droplet portion 37 is discharged to the water droplet outlet 21 by arbitrarily operating the on-off valve 39 of the guide conduit 38.

"Effects of the Present Invention" As is clear from the above explanation, the present invention has the following explanations.

(1) A water droplet pool is formed at the bottom of the exhaust chamber, and the water droplets collected in this water droplet pool are guided to the water droplet outlet formed on the processing table through a guide conduit, so that the water droplets are directly removed from the processing table, which is the work surface. Water droplets do not drip down onto the top plate.

Therefore, there is no need to worry about water droplets getting into the sample placed on the processing table, and there is no need to run water from the water faucet to wash away water droplets that have accumulated on the processing table, unlike in conventional embodiments. No longer needed.

(2) Vertical wall 3 of the exhaust port conduit on the upper edge of the lower exhaust port
When a guide wall is provided to guide the water droplets descending through the water droplets 4 to the water droplet collecting portion 37, it is possible to reliably prevent the water droplets from flowing into the processing chamber side.

[Brief explanation of drawings]

1 to 4 are schematic illustrations showing an embodiment of the present invention, and FIG. 5 is a schematic illustration showing a conventional embodiment. 20... Processing table, 20a... Top plate, 21... Water droplet outlet, 22... Processing chamber, 28... Exhaust chamber, 2
9... Exhaust guide section, 31... Exhaust duct, 33...
Upper exhaust port, 34... Vertical wall, 36... Lower exhaust port, 37... Water droplet collecting portion, 38... Guide conduit,
39... Opening/closing valve, 49... Guide wall.

Claims (1)

[Scope of utility model registration request] A draft channel that has a processing chamber and an exhaust chamber above the processing table, and guides gas generated in the processing chamber to the exhaust chamber through upper and lower exhaust ports formed in the wall located on the rear side of the processing chamber. In the exhaust chamber, a water droplet pool is formed in the lower part of the exhaust chamber below the lower exhaust port to temporarily store the water droplets flowing down along the inner wall surface of the exhaust chamber, and the water droplets accumulated in the water droplet pool are A draft chamber characterized in that water is discharged through a guide conduit to a water droplet outlet formed in the processing table.