JP4256056B2 - Draft chamber - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to a draft chamber installed in a chemical laboratory or laboratory.
[0002]
[Prior art]
In draft chambers installed in chemical laboratories and laboratories, in order to prevent toxic gases and odorous gases in the chamber from leaking into the room, the gas in the chamber is sucked in by an intake duct, Indoor air is allowed to flow into the draft chamber. As a result, negative pressure is generated in the room, which makes it difficult to open and close the door of the room and makes it easier for rain to blow into the room. Further, in the air-conditioned room, indoor air is discharged through the draft chamber, which causes a problem that energy loss is large. Therefore, an air curtain type draft chamber has been adopted.
[0003]
FIG. 4 shows a typical air curtain type draft chamber 50. The chamber 50 is provided with a glass door 51 on the front surface, and an air supply duct 52 and an intake duct 53 for supplying outside air to the top. The lower part of the glass door 51 is always open. The air supply duct 52 forces the outside air to flow down to the front surface of the glass door 51 to form an air curtain A, and then flows into the chamber 50 together with the indoor air B from the lower opening of the glass door 51 and exhausts from the intake duct 53. Is done.
[0004]
However, in such an air curtain type draft chamber, since the amount of outside air blown out from the air supply duct 52 is large, cold outside air directly hits the operator's head in the winter and hot outside air in the summer directly. There is a problem of discomfort.
[0005]
Also, in the air curtain type draft chamber, both supply and exhaust of outside air are forcibly performed by the blower, making it difficult to balance the amount of air supply (push) and the amount of exhaust (pull). If this balance is lost, adverse effects such as increased air conditioning loss in the room and negative pressure in the room will occur.
[0006]
[Problems to be solved by the invention]
An object of the present invention is to prevent a toxic gas or the like from leaking into a room from a chamber, to suppress a negative pressure inside the room, to reduce energy loss of air conditioning, and to realize a comfortable working environment. It is to provide a draft chamber that can be used.
[0007]
[Means for Solving the Problems]
The draft chamber of the present invention is provided with an open / close door on the front surface and provided with an intake duct for forcibly exhausting gas in the chamber, and has a vent hole provided with a ventilation resistance member on the wall surface, ceiling surface or Provided on the floor and through the vent by the forced exhaust , the vent is passed through the ceiling space, under-floor space or wall space of the room where the draft chamber is installed. It is characterized by having communicated with the outdoors.
[0008]
Thus, the present invention sucks the gas in the chamber through the intake duct and does not form an air curtain on the front surface of the door. Therefore, since there is no air supply duct equipped with an air supply blower, there is no need to consider the balance between air supply and exhaust as in the conventional air curtain system, and outside air is the head of the operator in winter and summer. In this case, the operator is not discomforted.
[0009]
In addition, since the vent hole provided with the ventilation resistance member is provided on the wall surface, ceiling surface, or floor surface of the chamber, ventilation from the ventilation hole is suppressed by the ventilation resistance member when the front opening / closing door is opened. It is possible to prevent indoor air from mainly flowing into the chamber and leaking toxic gas or the like in the chamber into the room. On the other hand, when the open / close door is closed, since the outside air flows into the chamber from the vent, it is possible to prevent the room air from being sucked and the room to become negative pressure.
[0010]
Preferably, the vent provided with the ventilation resistance member in the present invention is provided on the side wall surface of the chamber, and a ventilation duct extends from the space behind the ceiling toward the ventilation hole, and passes through the ventilation hole from the ventilation duct. The outside air is configured to be sucked into the chamber.
[0011]
In the present invention, a vent provided with the ventilation resistance member may be provided on the ceiling surface of the chamber, and the outside air may flow into the chamber directly from the space behind the ceiling via the vent.
Such a configuration can be suitably applied to a large draft chamber (generally called a walk-in type draft chamber) in which an operator can enter and work.
[0012]
The ventilation resistance member is preferably a louver, but is not limited to this, and various members such as a breathable cloth, a net material, and a porous plate can be used.
[0013]
DETAILED DESCRIPTION OF THE INVENTION
Hereinafter, an embodiment of the present invention will be described with reference to FIGS. 1 and 2. FIG. 1 shows a configuration of a draft chamber 1 according to this embodiment, and FIG. 2 shows a front view thereof.
[0014]
A draft chamber 1 shown in FIGS. 1 and 2 is installed on a desk 2. A sliding door 3 is provided on the front surface of the chamber 1 (a surface parallel to the paper surface in FIG. 1). As shown in FIG. 2, a fitting glass plate 19 is attached to the upper part of the open / close door 3. A drawer 20 is provided on the front surface of the desk 2.
[0015]
An intake duct 4 for sucking the internal gas is connected to the chamber 1. An intake blower 8 for forcibly exhausting the gas in the chamber 1 is attached to the intake duct 4.
[0016]
On the other hand, the side wall 5 of the chamber 1 is provided with a vent 7 to which a louver 6 (ventilation resistance member) is attached. On the outside of the side wall 5, a ventilation duct 10 extends from the ceiling back space 9 toward the ventilation hole 7. The lower end opening 11 of the ventilation duct 10 is located near the upper end portion of the ventilation hole 7. The width dimension of the vent hole 7 and the vent duct 10 is substantially equal to the width dimension of the side wall 5. A cover 21 covering the vent hole 7 may be attached to the lower end opening 11 of the vent duct 10.
The louver 6 has a plurality of blades arranged in parallel at the opening in an inclined posture. The slats may be either fixed or variable.
[0017]
The ceiling back space 9 shown in FIG. 1 is a space surrounded by the ceiling 13, the roof 14, and the outer wall 15 of the chamber 12, and an outside air intake 16 for taking in outside air is formed in the outer wall 15. A dustproof filter 17 is attached to the outside air intake 16, and a hood 18 is attached to the outdoor side.
[0018]
The draft chamber 1 configured in this way communicates with the outdoor 40 from the vent 7 through the ceiling air space 9 and the ventilation duct 10 through the outside air intake 16, so that outside air can be introduced into the chamber 1. It becomes possible.
[0019]
That is, when the open / close door 3 on the front side of the draft chamber 1 is closed, the intake blower 8 is operating, but there is no inflow of air from the front open / close door 3. For this reason, the air is sucked into the chamber 1 from the vent 7 of the side wall 5, but the lower end opening 11 of the vent duct 10 faces the outer upper portion of the vent 7, so that the outside air mainly passes from the ceiling space 9. It flows into the chamber 1 through the ventilation duct 10. Therefore, since air in the chamber 12 is rarely sucked, there is no possibility that the inside of the chamber 12 becomes negative pressure, and energy loss of air conditioning can be reduced.
[0020]
When the draft chamber 1 is used, the front door 3 is opened for use. At this time, since the louver 6 is attached to the vent hole 7 as a ventilation resistance member, the air in the chamber 12 mainly flows into the chamber 1 from the front opening portion where the open / close door 3 is opened. It is exhausted through the intake duct 4 together with poisonous gas and the like. As a result, it is possible to prevent toxic gas or the like in the chamber 1 from leaking into the room.
[0021]
In the above description, the vent 7 provided with the louver 6 is provided on the one side wall 5 of the chamber 1, but may be provided on both side walls. Further, the vent 7 may be provided on the ceiling, floor, etc. of the chamber 1. For example, when the vent hole 7 is provided in the ceiling of the chamber 1, the outside air can be taken directly from the ceiling space 9 without using the vent duct 10. When the chamber 1 is located near the wall of the chamber 12, the outside air may be taken in through the wall portion.
[0022]
Next, another embodiment of the present invention will be described with reference to FIG. FIG. 3 shows a draft chamber 30 according to this embodiment. This draft chamber 30 is a so-called walk-in type. The chamber 30 has an opening / closing door 31 attached to the front surface, and a ceiling 32 provided with a vent 33 for taking outside air from the space behind the ceiling. A louver 34 is attached to the vent 33. In addition, a ventilation port 36 having a louver 35 is provided at the lower part of the open / close door 31. The ceiling back space communicates with the outdoors in the same manner as in the above-described embodiment, and outside air can be taken into the ceiling back space.
[0023]
An intake duct 37 extends from the top of the ceiling 32 in the chamber 30, and an intake port 38 is provided in the chamber 30. An intake blower 38 is connected to the intake duct 37, and toxic gas in the chamber 30 is forcibly sucked and discharged from the intake port 38.
[0024]
With this configuration, in this embodiment, when the open / close door 31 is closed, outside air flows into the chamber 30 mainly from the vent 33 through the ceiling space by the intake air from the intake blower 38. As a result, negative pressure in the chamber 12 can be suppressed and energy loss of air conditioning can be reduced. Moreover, since a part of room air is suck | inhaled in the chamber 30 from the ventilation port 36 of the opening-and-closing door 31, indoor ventilation becomes possible.
[0025]
In addition, when the open / close door 31 is opened, the louver 34 is attached as a ventilation resistance material to the vent 33, so that indoor air mainly flows into the chamber 30 from the opening where the open / close door 31 is opened. The exhaust gas is exhausted through the intake duct 37 together with the toxic gas in the interior 30. As a result, it is possible to prevent toxic gas or the like in the chamber 30 from leaking into the room.
The installation location of the vent 33 is not limited to the ceiling, and may be provided on the wall or floor of the chamber 30.
[0026]
【The invention's effect】
According to the present invention, it is possible to prevent toxic gas and the like from leaking into the room from the chamber, to suppress negative pressure in the room, and to reduce the energy loss of air conditioning. As a result, there is no overhead air blowing that causes discomfort to the worker, and thus a comfortable working environment can be realized.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing a draft chamber according to an embodiment of the present invention.
FIG. 2 is a front view of the draft chamber shown in FIG.
FIG. 3 is a partially broken schematic perspective view showing a draft chamber according to another embodiment of the present invention.
FIG. 4 is an explanatory view showing a normal air curtain type draft chamber;
[Explanation of symbols]
1 Draft chamber 3 Open / close door 4 Air intake duct 5 Side wall 6 Louver (ventilation resistance member)
7 Vent 8 Intake Blower 9 Ceiling Back Space 10 Vent Duct 12 Chamber 30 Draft Chamber 31 Open / Close Door 33 Vent 34 Lever (Ventilation Resistance Member)
37 Air intake duct

Claims (4)

In a draft chamber provided with an open / close door on the front side and an intake duct for forcibly exhausting gas in the chamber, a vent hole provided with a ventilation resistance member is provided on the wall surface, ceiling surface or floor surface of the chamber, The vent is communicated with the outside through the ceiling space, under-floor space or wall of the room where the draft chamber is installed so that the outside air is sucked into the chamber through this vent by forced exhaust. A draft chamber characterized by   A ventilation port provided with the ventilation resistance member is provided on the side wall surface of the chamber, and a ventilation duct extends from the space behind the ceiling toward the ventilation port, and outside air is sucked into the chamber through the ventilation port. The draft chamber according to claim 1, wherein the draft chamber is formed.   The draft chamber according to claim 1, wherein a ventilation port provided with the ventilation resistance member is provided on a ceiling surface of the chamber so that outside air flows into the chamber directly from the space behind the ceiling through the ventilation port.   The draft chamber according to claim 1, 2, or 3, wherein the ventilation resistance member is a louver.

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