JPH0418669Y2 - - Google Patents

Description

[Detailed Description of the Invention] [Industrial Application Field] The present invention relates to a type of draft chamber in which air is supplied by forming an air curtain outside the front opening of the main body.

[Prior Art] A draft chamber installed in a room such as a laboratory and used as an exhaust device for gas generated in a chemical experiment has a main body with an open front part to create a space inside the main body. This device is equipped with an exhaust port, so that experiments can be conducted in the internal space of the main body, and the gas generated by the experiment can be exhausted from the exhaust port to the outdoors via an exhaust duct.

Since the draft chamber exhausts the gas generated inside the main body, it is necessary to supply air from outside the main body to the inside of the main body. Therefore, air from the room where the draft chamber is installed is taken into the main body to supply air. is being carried out. However, if indoor air is used to supply air to the draft chamber in this way, if the room is being cooled or heated, the cooled or heated indoor air will be sucked into the draft chamber. Because it is discharged outdoors, the thermal efficiency of indoor heating and cooling systems is affected and reduced.

Therefore, in consideration of this point, an air curtain type draft chamber is used. This type of draft chamber has a blow-off duct for forming an air curtain attached to the outside of the upper part of the front open part of the main body, and air sent from a separately installed blower is guided to the blow-off duct, and the bottom of the blow-off duct is Air is blown out from the air outlet to form an air curtain outside the front opening of the draft chamber body, and the air forming the air curtain is taken into the draft chamber body from the front opening. . According to this type of draft chamber,
Since the intake of indoor air is blocked and air from the air curtain is supplied inside the main body instead, it has the characteristic that it does not affect the thermal efficiency of indoor air conditioning.

[Problems to be solved by the invention] However, the conventional air curtain type draft chamber has the following problems.

An illumination light such as a fluorescent lamp is attached to the ceiling wall of the space inside the draft chamber body to illuminate the space. When this illuminating lamp breaks down and needs to be replaced with a new one, an operator enters the interior space through the front opening of the draft chamber body and performs the replacement work. In other words, the exhaust duct and air supply duct are connected to the ceiling of the draft chamber body, and the air duct is attached and fixed to the upper part of the open front part of the draft chamber body, so replacement work must be performed from outside the body. Since it is not possible to do so, workers have to go inside the main body to remove and install the lighting.

However, various liquid and solid chemical substances used in experiments remain attached to the walls of the internal space of the draft chamber body, and some of these substances can be extremely harmful. Therefore, when a worker enters the inside of the draft chamber body to replace the lighting, harmful substances attached to the walls of the interior space of the body may adhere to the worker's skin. ,
There is a risk of getting into the eyes or mouth and causing harm to the human body.
Replacing lighting lights is extremely dangerous.

This invention was made based on the above circumstances,
To provide an air curtain type draft chamber in which a lighting lamp provided inside the draft chamber body can be safely replaced from outside the body.

[Means for Solving the Problems] In order to achieve the above object, the air curtain type draft chamber of the present invention has a work opening section formed therein, a lighting lamp arrangement section provided inside the ceiling section, and a ceiling section. A draft chamber main body provided with an air supply box for an air curtain on the outside, an air curtain blowout duct disposed outside the upper side of the opening of the draft chamber main body, and this blowoff duct connected to the draft chamber main body. and a supporting member movably supporting the draft chamber main body in a direction toward and away from the draft chamber main body, and the illumination light arrangement portion is provided on a wall portion of the draft chamber main body at a position facing the air outlet duct. an opening that communicates with the air supply box and is covered by the airflow duct when the airflow duct is in a position close to the draft chamber main body, and the airflow duct is removably connected to the air supply box. The draft chamber body is characterized by having a mouth, an outlet for blowing out air for the air curtain toward the opening of the draft chamber main body, and a wall portion that covers the opening of the draft chamber main body.

[Function] With this configuration, the blow-out duct is pulled out in the direction away from the draft chamber main body to open the opening in the side wall of the draft chamber main body facing the blow-off duct, and the worker can enter the inside of the main body through this opening. Insert your hand to replace the illumination light installed inside the draft chamber body. Therefore, the operator can replace the illumination lamp from the outside without entering the inside of the draft chamber body.

[Example] Hereinafter, an example of the present invention will be shown in Figures 1 to 10.
This will be explained with reference to the figures.

1 in the figure is the draft chamber main body, and this main body 1
A laboratory table 2 for chemical experiments is provided inside the chamber, and a space 3 above the work table 2 serves as a space for conducting experiments. An opening 4 is provided at the front of the draft chamber main body 1, through which an operator can take experimental tools and materials in and out of the space 3 when conducting a chemical experiment in the space 3. A lift door 5 divided into two stages is provided so as to be movable up and down. Further, a buttful plate 6 forming an exhaust passage is attached to the inner surface of the rear wall of the draft chamber main body 1, and an exhaust port 7 connected to an exhaust duct (not shown) is formed at the rear of the ceiling wall. As a result, the gas generated by the chemical experiment conducted in the internal space 3 of the draft chamber body 1 rises through the exhaust passage of the buttful plate 6 and reaches the exhaust port 7.
It is then discharged outside through an exhaust duct.

Furthermore, an air supply box 8 for an air curtain is mounted horizontally on the front upper part of the ceiling wall of the draft chamber body 1. As shown in FIG. 3, this air supply box 8 has a length corresponding to the width dimension of the draft chamber main body 1 and has a horizontally long box-shaped cross section. An air supply port 9 that connects to an air duct is formed, and a connection port 10 that connects to a blow-off duct for forming an air curtain, which will be described later, is formed in the front part. Connection ports 11, 11 are formed at both ends of the lower surface of the air supply box 8 to connect with an internal blow duct, which will be described later. It is installed along the entire length. Further, a damper shaft 13 is rotatably provided inside the air supply box 8 over the entire length direction, and this damper shaft 13 is provided with an external blowing damper 14.
and internal blowing dampers 15, 15 are installed with a phase angle of 90 degrees. The damper 14 has a length extending over the entire length of the air supply box 8, and the dampers 15, 15 are provided corresponding to the connection ports 11, 11. Note that the damper shaft 13 is rotationally controlled by a motor (not shown).

In addition, the front opening portion 4 of the draft chamber body 1
A blowout duct 16 for forming an air curtain is provided on the outside of the upper part of the air conditioner. This blowout duct 16 has a length corresponding to the length in the width direction of the draft chamber main body 1, has a vertically long box-shaped cross section, and has walls at the front, rear, top, and both ends. A connection port 17 is formed in the upper part of the rear surface part over the entire length direction, and connects to the connection port 10 formed in the front part of the air supply box 16.
Similarly, an air outlet 18 is formed along the entire length of the lower surface, and a filter 19 is attached to this air outlet 18. The rear wall of the blow-off duct 16 covers an opening 31 formed in the upper front of the draft chamber main body 1 so as to communicate with the illumination lamp placement section 26, as will be described later. As shown in FIG. 7, partition plates 19, 19 are attached to both ends of the inside of the blow-off duct 16, and horizontally opposing partition plates 19, 19 are attached to the upper part of the partition plates 19, 19 along the front-rear direction of the draft chamber body 1. Support rails 20, 20 are attached. This support rail 2
0 and 20 extend to the rear of the blow-off duct 16, and are in contact with the outer surfaces of both longitudinal end walls of the air supply box 8. A plurality of rail supports 21, 21 are attached to the outer surfaces of both end walls of the air supply box 8 at intervals in the front-rear direction, and the support rails 20, 20 of the air outlet duct 12 are attached to the rail supports 21, 21. is movably supported. Therefore, the blowout duct 16 is connected to the support rail 2.
0, 20 and rail supports 21, 21 to the air supply box 8, that is, the air supply box 8
The support rails 20, 20 are supported by the draft chamber main body 1 equipped with the rail supports 21, 21.
By sliding, the blow-off duct 16 can be moved in the front-rear direction of the draft chamber main body 1, that is, in the direction of approach and separation.

In addition, the internal space 3 of the draft chamber main body 1
There is an internal blow duct 23 installed at the front corner of the ceiling wall.
is provided. In other words, this inner blow duct 23
As shown in FIG. It is a combination of partition plates 24, 2 with an interval in the length direction.
4 are arranged, duct parts 25, 25 are formed at both ends, and an illumination lamp arrangement part 26 is provided in the center part. In the duct parts 25, 25, an air supply box 8 is provided on the upper surface part.
Connection ports 27, 27 connected to connection ports 11, 11 of
is formed, and air outlets 28, 28 are formed in the inclined surface portion. Filters 29, 29 are arranged in the air outlets 28, 28.
9 and 29 are removably supported by a support 30 provided on the inclined surface portion. In addition, the filter 29,
29 removes the support 30 and replaces it. In addition, the illuminating light arrangement section 26 has an opening 31 formed in the front part,
A window 33 with a glass plate 32 attached thereto is formed on the inclined surface. The opening 31 is formed facing the rear surface of the blow-off duct 16. This lighting lamp arrangement part 2
A fluorescent lamp 34 is arranged at 6 as an illumination lamp.
This fluorescent lamp 34 is removably attached to a base 35 on which a transformer or the like is mounted, and this base 35 is attached to a support plate 36. Rails 37, 37 are attached to the partition plates 24, 24 along the front-rear direction of the main body 1, and the support plate 36 is movably supported by the rails 37, 37.
Therefore, the fluorescent lamp 24 is supported in and out of the illumination lamp placement section 26.

The air curtain type draft chamber constructed in this manner is normally used with the blow-off duct 16 pressed against the front surface of the draft chamber main body 1, as shown in FIGS. 1 and 2. In this case, the rear wall of the blow-off duct 16 is connected to the inner blow-off duct 2.
The opening 31 on the front surface of the illumination lamp arrangement section 26 of No. 3 is covered from the outside. For example, if the damper 14 provided in the air supply box 8 is set horizontally and the damper 15 is set vertically as shown in FIG. 1, the air sent from the blower (not shown) through the air supply duct will be Enter the air supply box 8 from 9,
Furthermore, the air outlet duct 1 is connected through the connection ports 10 and 17.
Go inside 6. The air then changes its flow downward to the outlet 18 at the lower end of the outlet duct 16.
The air is blown out from the draft chamber body 1 to form an air curtain that covers the front opening 4 of the draft chamber body 1 from the outside.
Furthermore, the air forming the air curtain enters the inside of the draft chamber main body 1 from the front opening part 4,
Air is supplied to the experiment being conducted in the internal space 3. Note that no air flows through the connection port 11 of the air supply box 8. Furthermore, when the damper 15 is placed horizontally and the damper 14 is placed vertically, the air sent to the air supply box 8 enters the duct portions 25, 25 of the internal blow duct 23 via the connection ports 11, 27, Air is blown into the internal space 3 of the draft chamber main body 1 from the blow-off ports 28, 28 to supply air. In this case, no air curtain is formed outside the main body.

Therefore, when replacing the fluorescent lamp 34, when the operator holds the blow-off duct 16 and pulls it toward the front of the main body 1, the support rails 20, 20 are supported by the rail supports 21, 21 of the air box 8. slide toward the front of the main body. Therefore, the blowout duct 16 moves toward the front of the draft chamber main body 1 and away from the main body 1 while being supported by the support rails 20 , 20 , and the opening of the illuminating light arrangement portion 26 of the inner blowing duct 23 31 is released. Then, the blowout duct 16 is connected to the draft chamber main body 1.
The movement of the blow-off duct 16 is stopped at a position a predetermined distance away from. This distance between the two allows an operator to replace the fluorescent lamp 34 by inserting his/her body between the two. It is a spatial part of the size. For this reason, the lengths of the support rails 20, 20 are set to a size that allows this distance to be obtained. On the other hand, when the opening 31 of the illumination light arrangement section 26 of the inner blow duct 23 is opened, the operator can move the blow duct 16 and the opening 22 of the draft chamber main body 1 outside the draft chamber main body 1.
Insert your body into the space between the two, and then insert your hand into the illumination light placement section 26 of the inner blow duct 23 through the opening 31 to perform the work. In this case, move the fluorescent lamp 34 forward along the support plate 37 to the front opening 4 of the main body 1, remove the fluorescent lamp 34 from the base 35, and replace the new fluorescent lamp 3 at this position.
4 to the base 35. Thereafter, the support plate 36 is moved backward along the rails 37, 37, and is housed in the illumination lamp arrangement section 26. Further, if openings 38, 38 are formed in the front parts of the duct parts 25, 25 of the inner blowing duct 23, the openings 38, 38
It is also possible to replace the filters 29, 29 via the filter 8. These openings 38, 38 are normally
9, 39 to prevent air flowing through the duct from leaking. After finishing the work, the blowing duct 16 is pushed and moved toward the draft chamber main body 1, and comes into contact with the front wall of the draft chamber main body 1. Also in this case, the blowout duct 16 is supported by the support rails 20, 20 and moves. In this way, when replacing the fluorescent lamp 34, the operator can perform the work from outside the main body without entering the internal space 3 of the draft chamber main body 1. Therefore, the operator can avoid the risk of coming into contact with harmful chemical substances adhering to the wall surface of the internal space 3 of the draft chamber body 1.

Further, in this embodiment, the fluorescent lamp 34 is located near the opening 33 of the draft chamber body 1, so that replacement work can be easily performed. Further, since the duct portions 25, 25 of the internal blowing duct 23 are independent from the illumination lamp arrangement portion 26, air does not leak to the outside. Furthermore, the light from the fluorescent lamp 34 is irradiated onto the internal space 3 of the draft chamber main body 1 through the window 33 of the illumination lamp arrangement section 26.

[Effect of the invention] As explained above, according to the air curtain type draft chamber of the invention, the blowing duct that blows out the air for the air curtain can be moved in the direction of approaching and away from the draft chamber main body using the support member. The wall of the draft chamber body is movably supported, and is connected to the illumination light arrangement portion of the draft chamber body at a position opposite to the air outlet duct, and at a position where the air outlet duct is close to the draft chamber body. The outlet duct has an opening that is covered by the outlet duct when the air outlet is in the draft chamber, and the outlet duct has a connection port that is detachably connected to the air supply box, and an opening that blows the air for the air curtain toward the open part of the draft chamber body. It has a wall portion that covers the air outlet and the opening of the draft chamber body. For this reason,
By pulling out the outlet duct and separating it from the draft chamber body, the opening of the draft chamber body covered by the wall of the outlet duct is opened, and a space is created between the outlet duct and the draft chamber body. can be formed. This allows the operator to use the opening of the draft chamber body and the space between the blow-off duct and the draft chamber body when replacing the illumination light installed in the illumination light arrangement section of the draft chamber body. This allows work to be carried out from outside the draft chamber body. Also, when you push the outlet duct and approach the draft chamber body, the wall of the outlet duct covers the opening of the draft chamber body from the outside.
This prevents dirt from entering the lighting lamp arrangement area from the outside, and the connection port of the outlet duct is connected to the air supply box on the draft chamber body, allowing air to be sent from the air supply box to the outlet duct to create a good air curtain. It is now possible to form. Therefore, when replacing the lighting lamp, it is possible to avoid the risk of the worker entering the inside of the draft chamber body and coming into contact with harmful substances adhering to the wall inside the body, causing bodily injury. Work can be done safely.

[Brief explanation of the drawing]

The drawings show one embodiment of the present invention, and FIGS. 1 and 2 are cross-sectional views of the draft chamber, FIG. 3 is a front view, FIG. 4 is a plan view, and FIG. 5 is an enlarged view of the blow-off duct. 6 to 8 are diagrams showing the same outlet duct, FIG. 9 is a perspective view showing the air supply box and the outlet duct, and FIG. 10 is a perspective view showing the inner outlet duct and illuminating light. be. DESCRIPTION OF SYMBOLS 1...Draft chamber body, 3...Internal space, 4...Front opening, 7...Exhaust port, 8...Air supply box, 16...Blowout duct, 20...Support rail, 21... Rail support, 31...opening.

Claims (1)

[Scope of utility model registration request] A draft chamber main body in which a work opening is formed, an internal lighting lamp arrangement part in the ceiling is provided, and an air supply box for an air curtain is provided outside the ceiling; The air curtain includes an air curtain blowout duct disposed on the upper outside, and a supporting member that supports the blowout duct in a movable manner in a direction toward and away from the draft chamber body, and The wall of the chamber body has an opening that communicates with the illumination light arrangement section at a position opposite to the blow-off duct and that is covered by the blow-off duct when the blow-off duct is in a position close to the draft chamber body. The blow-off duct includes a connection port that is detachably connected to the air supply box, a blow-off port that blows out air for the air curtain towards an open portion of the draft chamber main body, and the blow-off duct that is connected to the air supply box in a detachable manner. An air curtain type draft chamber characterized by having a wall portion that covers an opening of the chamber.