JP2953259B2 - Air curtain type draft chamber - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a draft chamber installed in a chemical laboratory or the like, and more particularly, to an air curtain type draft chamber provided with an air curtain box above a front opening of the draft chamber. Things.

[0002]

2. Description of the Related Art In a draft chamber, an inside of an opening provided on a front surface is used as a processing chamber, and the processing chamber is communicated with an exhaust means so that odors, toxic gases, and the like generated by a chemical experiment or the like performed in the processing chamber. It is configured to be discharged out of the laboratory by the exhaust means. When the processing chamber in the draft chamber is evacuated, it is necessary to supply air to the processing chamber, and the air in the laboratory is introduced into the processing chamber of the draft chamber and exhausted together with the odor and toxic gas in the processing chamber. . For this reason, the air conditioning in the cooled or heated room is disturbed, which leads to a loss of energy for air conditioning. Therefore, in order to prevent disturbance of air conditioning in the laboratory due to exhaust of the processing chamber in the draft chamber, an air curtain type draft chamber provided with an air curtain box connected to an air supply means above the front opening of the draft chamber. Is used.
The air curtain box communicates with the outside air by an air supply means such as an air supply duct, and the outside air supplied from the air supply means is supplied from an air supply port on the lower surface of the air curtain box from above the opening on the front of the processing chamber. An object of the present invention is to efficiently discharge air from a processing chamber by blowing the air and supplying the blown air into the processing chamber, and to reduce energy loss due to disturbance of air conditioning in the room.

[0003]

However, the conventional air curtain box is merely a hollow box having an air supply duct connected to the upper surface and an air supply port formed at the lower surface toward the opening of the processing chamber. Therefore, not only does the outside air with a temperature difference blow at a high speed directly from the overhead of the experimenter, causing discomfort to the experimenter, but also the speed of the outside air supplied through the air curtain box is not constant, and the air curtain It spread from front to back, right and left from the air supply port on the lower surface of the box, and flowed into the laboratory, resulting in disturbing the air conditioning in the laboratory.
Therefore, the present invention provides an air curtain type draft chamber, in which the wind speed of the outside air supplied from the air curtain box is made uniform and slow on the whole, so that the experimenter is not discomforted, and the indoor It is an object of the present invention to provide an air curtain type draft chamber capable of effectively exhausting a processing chamber of a draft chamber without disturbing air conditioning.

[0004]

According to the present invention, there is provided an air curtain type draft chamber having an air curtain box connected to an air supply means above a front opening. In the chamber, a plurality of resistance plates made of a gas-permeable material having airflow resistance and giving a pressure loss to the air supply from the air supply means are provided in the air curtain box provided in the upper part of the front surface of the draft chamber main body. Equipped with air supply / retention means detachably provided
And the resistance plate in the air curtain box.
A front cover for attachment and detachment is provided . Further, in the present invention, as the air retention means, provided with the resistive plate in a plurality of stages in a state of closing the vent path in the air curtain box, the bottom of the resistor plate whose lower surface facing the front opening of the fume hood Thus, an air curtain type draft chamber provided in an inwardly inclined state is provided.

[0005]

In the air curtain type draft chamber according to the present invention as described above, high-speed external air forcibly supplied by an air supply means such as an air supply duct communicating outside is provided in the air curtain box. The air is sent from above the front opening of the draft chamber at a uniform and uniform speed as a whole, while receiving a ventilation resistance when passing through the air holding means. In addition, a multi-stage resistance plate made of a breathable material is attached and detached as air supply retention means.
Since there is provided a stationary, outside air stepwise speed is slower reasonably by pressure loss due to the resistance plate in a plurality of stages supplied by the air supply means, and, from the air curtain box draft chamber in a more uniform air velocity Supplied from above the front opening. Further, by providing the lowermost resistance plate in a state in which the lower surface is inwardly inclined so as to face the front opening of the draft chamber, the air supply from the air curtain box is directly above the experimenter's head. At the same time, the outside air is effectively supplied to the processing chamber, and the outside air with a temperature difference does not enter the laboratory and disturb the air conditioning in the room. Often done. And the front cover provided in the air curtain box
The resistor plate is opened and the resistor plate is attached and detached.
This facilitates the maintenance of the board.

[0006]

FIG. 1 is a perspective view showing an embodiment of an air curtain type draft chamber 1 according to the present invention. In the drawing, reference numeral 2 denotes a draft chamber main body, and a front opening 4 of the draft chamber main body 2 is provided with a front door 4 which slides up and down to open and close. A chamber 5 is provided. An exhaust duct 6 is provided on the upper surface of the draft chamber main body 2 to communicate with the processing chamber 5 and forcibly exhaust odors, toxic gases, and the like generated by chemical experiments and the like in the processing chamber 5 to the outside of the laboratory. Is provided. Further, an air curtain box 7 is provided above the front opening 3 on the upper front surface of the draft chamber main body 2, and the upper surface of the air curtain box 7 communicates with the outside of the laboratory. , An air supply duct 8 for forcibly supplying outside air is provided.

The inside of the draft chamber main body 2 is
For example, as shown in FIG. 2, a partition wall 11 is provided at the back, and an exhaust path 12 communicating with an exhaust port 19 of an exhaust duct 6 opened on the upper surface of the processing chamber 5 is formed on the back side thereof. Above the front opening 3, a gallery 13 for adjusting the amount of air supplied into the processing chamber 5 and adjusting the exhaust from the exhaust duct 6 is attached, and a front door is provided on the back side of the gallery 13. 4 is provided to be openable and closable up and down.

The air curtain box 7 is
As shown in FIGS. 2 and 3, an air supply port 8 formed on the upper surface of the air curtain box 7 is connected to an air supply duct 8 that communicates with the outside of the laboratory and forcibly supplies outside air. Draft chamber body 2 on the bottom and back respectively
A lower surface side air supply port 14 opened above the front opening 3 and a rear side air supply port 15 opened inside the processing chamber 5 are provided. A blind plate 16 made of a punching board or the like is attached to the lower surface side air supply port 14, and the rear side air supply port 15 is processed through a gallery 13 provided in the front opening 3 of the draft chamber main body 2. It is provided in a state communicating with the inside of the chamber 5. Further, in the present invention, the air supply port 9 connected to the air supply duct 8 formed on the upper surface of the air curtain box 7 and the lower surface side serve as air supply stagnation means for the outside air forcibly supplied from the air supply duct 8. In a state in which the ventilation path 10 formed between the air supply port 14 and the back side air supply port 15 is closed, a plurality of resistance plates 21, 22, and 23 made of a permeable material are provided. The resistance plate 23 is located below
Surface faces the front opening 3 of the draft chamber body 2
As shown in FIG. These resistance plates 21 to 23 are used for the front cover 1 of the air curtain box.
8 can be opened and removed.

The resistance plates 21 and 2 as the air supply / stagnation means
3 is made of a gas permeable material such as a filter, a nonwoven fabric, and steel wool, for example, is formed in a plate shape, and is installed in a state where the air passage 10 of the air curtain box 7 is closed. To provide airflow resistance to the outside air supplied to the air curtain box 7, and receives a pressure loss due to the airflow resistance when the supplied outside air passes through the resistance plates 21 to 23. The outside air supplied from the rear air supply port 14 or the rear side air supply port 15 is uniform in both the depth direction and the width direction, has no unevenness in the wind speed, and has an average low air supply speed.

FIGS. 4 to 7 show one of the resistance plates 20 as described above.
1 shows an embodiment and a method for producing the same. As shown in FIG. 5, this resistance plate 20 is obtained by cutting a mesh fabric 25, which is a breathable material, into appropriate lengths as shown in FIG. As shown, it is created by inserting a frame 26 made of a wire or a plate such as an iron wire into the inverted bag-like mesh fabric 25, and then sewing the opening or closing it with a clip, stapler, or the like. . In this way, the resistance plate 20 is
Can be easily created simply by cutting the air-permeable material into an appropriate size and inserting the frame 26, and the structure is simple and the cost can be reduced. Can be created separately, so that it is possible to easily cope with specification changes and the like. In addition, when the mesh fabric 25 is contaminated, the front cover 18 of the air curtain box is opened, the resistance plates 21 to 23 are taken out, and the frame 2 in the mesh fabric 25 is removed.
6 can be removed and only the outer mesh fabric 25 can be washed at once and in large quantities, which is advantageous in terms of maintenance.

The operation of the air curtain type draft chamber 1 according to the present invention constructed as described above will be described below with reference to FIGS. First, FIG. 8 shows a use state in which the front opening 3 of the draft chamber main body 2 is fully closed by the front door 4. In a state where the front door 4 is closed, the processing chamber 5, the ventilation part 10 in the air curtain box 7, and the laboratory in which the draft chamber 1 is installed are communicated through the upper portion of the gallery 13.
A part of the outside air A forcibly supplied from the air supply port 9 of the air curtain box 7 passes through the air passage 10 in the air curtain box 7 and the rear air supply port 15 provided on the rear side thereof. The air is supplied from the portion to the processing chamber 5 of the draft chamber main body 2 through the gallery 13, and a part of the other outside air A is supplied from the lower surface side air supply port 14 provided on the lower surface of the air curtain box 7 to the front opening 3. The air is sent forward, and is similarly supplied into the processing chamber 5 from the gallery 13 above the front opening 3. A small gap 31 communicating with the laboratory is formed below the front door 4.
, The air B in the laboratory is also supplied into the processing chamber 5. Then, as described above, the processing chamber 5 is removed from the air curtain box 7.
The outside air A supplied to the chamber and the room air B supplied from the laboratory are combined with the air in the processing chamber 5 from above and below the partition 11 formed from the back of the processing chamber 5 to the exhaust path 12 on the back side thereof. Then, the air is forcibly exhausted C from the exhaust port 19 opened on the upper surface of the processing chamber 5 through the exhaust duct 6 to the outside of the chamber. As shown in FIG. 9, when the front door 4 that opens and closes the front opening 3 of the draft chamber main body 2 is opened, the rear air inlet 15 of the air curtain box 7 is closed by the front door 4. . Therefore, the outside air A supplied from the air supply port 9 on the upper surface is supplied to the air passage 1 in the air curtain box 7.
All the air is blown out from the lower surface side air supply port 14 toward the front opening 3 of the processing chamber 5 through the front opening 3 and supplied into the processing chamber 5 from the front opening 3. At this time, the air curtain box 7
Is supplied into the processing chamber 5 at the same time as the external air A supplied from the laboratory. The outside air A and the air B in the laboratory thus supplied are forcibly exhausted to the outside of the laboratory through the exhaust duct 6 from the exhaust port 19 on the upper surface of the processing chamber 5 in the same manner as described above.

In the air curtain type draft chamber 1 according to the present invention, the high-speed external air A forcedly introduced by an air supply means such as an air supply duct 8 communicating outside the laboratory is supplied to the inside of the air curtain box 7. At the same time, the air pressure is reduced due to the airflow resistance by the plurality of resistance plates 21 to 23 provided at
By sequentially passing through Nos. 1 to 23, the ink is supplied from above the front opening 3 of the processing chamber 5 at a uniform and uniform speed.
Therefore, unlike the conventional air curtain box, not only does the high-speed external air blow directly above the experimenter's head to cause discomfort, but also the high-speed external air that is blown diffuses into the laboratory. It does not disturb the indoor air conditioning. In addition, as the air supply retention means, a plurality of resistance plates 21 to 23 made of a breathable material as in the embodiment are used.
Is provided, the outside air A supplied from the air supply duct 8 is
Is smoothly and gradually reduced by successively receiving pressure loss by the plurality of resistance plates 21 to 23, and is supplied from the air curtain box 7 from above the opening at the front of the processing chamber at a more uniform air supply speed. Is done. Furthermore, the lowermost resistance plate 2
3 is inclined toward the front opening 3, so that the outside air A blown out of the air curtain box is prevented from directly blowing on the experimenter's head, and at the same time, the outside air A enters the laboratory. The outside air A is efficiently supplied into the processing chamber 5 without disturbing the air-conditioning in the room and the inside of the processing chamber 5 can be effectively exhausted.

[0013]

As described above, according to the air curtain type draft chamber of the present invention, the draft chamber
A plurality of resistance plates made of a breathable material having airflow resistance and giving pressure loss to air supply from the air supply means are detachably provided in an air curtain box provided at an upper portion of a front surface of the main body . <br/> Air retention means, and the air curtain
By providing a front cover for attaching and detaching the resistance plate to the air curtain, the air curtain, which is forcibly introduced from an air supply means such as an air supply duct, passes through the air curtain box when passing through the air curtain box. Receives airflow resistance due to the air retention means provided in the box , that is, passes through a multi-stage resistance plate
The pressure drop at the time of
The air curtain at a uniform and uniform air supply rate
From the box above the front opening of the draft chamber
If the resistance plate becomes dirty, replace the front cover.
Open, remove the resistance plate and wash it, so maintainer
Is easy. Therefore, unlike the case of the conventional air curtain type draft chamber, the outside air is not blown out into the laboratory vigorously and disturbs the air conditioning in the room. It does not cause the experimenter to feel uncomfortable because the outside air blows strongly from the overhead of the experimenter. In addition , the lower surface of the lowermost resistor plate faces the front opening of the draft chamber.
When the air curtain is installed in an inwardly inclined state, the air from the air curtain box is sent toward the opening in the front of the processing chamber, so that the outside air with a temperature difference blows directly above the experimenter's head. At the same time as preventing this, the outside air supplied from the air curtain box is efficiently supplied to the draft chamber processing chamber without the outside air diffusing into the laboratory and disturbing the indoor air conditioning, and the processing chamber of the draft chamber is It can be exhausted effectively.

[Brief description of the drawings]

FIG. 1 is a perspective view showing one embodiment of an air curtain type draft chamber according to the present invention.

FIG. 2 is a simplified side sectional view of the draft chamber.

FIG. 3 is an enlarged side sectional view of an air curtain box portion.

FIG. 4 is a longitudinal sectional view showing one embodiment of a resistance plate.

FIG. 5 is a perspective view showing a method for producing the resistance plate.

FIG. 6 is a perspective view showing a method for producing the resistance plate.

FIG. 7 is a perspective view showing a method for producing the resistance plate.

FIG. 8 is a side sectional view of a main part for describing a state of air supply and exhaust with the front door closed in the draft chamber according to the present invention.

FIG. 9 is a side sectional view of a main part for describing a state of air supply and exhaust with the front door opened.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 Draft chamber 2 Draft chamber main body 3 Front opening part 4 Front door 5 Processing room 6 Exhaust duct 7 Air curtain box 8 Air supply duct 9 Air supply port 10 Ventilation path 11 Partition wall 12 Exhaust path 13 Gully 14 Lower side air supply port 15 Back Side air inlet 16 Blind board 18 Front cover 19 Exhaust port 21 Resistance plate 22 Resistance plate 23 Resistance plate 25 Mesh ground 26 Frame A Outside air B Indoor air C Exhaust

Claims (2)

(57) [Claims] 1. An air curtain type draft chamber provided with an air curtain box connected to an air supply means above a front opening portion, wherein the air curtain box is provided on a front surface of a main body of the draft chamber.
In the air curtain box provided in the section, a plurality of resistance plates made of a breathable material having ventilation resistance and giving pressure loss to the air supply from the air supply means are detachably provided, and the air curtain retention means is provided. Before the air curtain box
An air curtain type draft chamber comprising a front cover for attaching and detaching the resistance plate . As claimed in claim 2, wherein said air retention means, provided with the resistive plate in a plurality of stages in a state of closing the vent path in the air curtain box, the bottom of the resistor plate whose lower surface facing the front opening of the fume hood The air curtain type draft chamber according to claim 1, wherein the air curtain type draft chamber is provided so as to be inclined inward .