JP2001232218A - Draft chamber - Google Patents

Abstract

PROBLEM TO BE SOLVED: To facilitate fractional work after the replacement or disposal of the member surrounding a work space in a draft chamber. SOLUTION: For example, a side panel 1 is formed so as to have a double- layer structure of a main body 33 and an interior material 34 and the interior material 34 is pressed and fixed to the main body 33 by a screw clamp type press member 38. The press member 38 and a screw 39 are protected by a cover 42 made of a synthetic resin.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a draft chamber (fume hood).

[0002]

2. Description of the Related Art Generally, a draft chamber is provided with a front opening working space surrounded by left and right side plates, a back plate, a top plate and a table plate, and a door of a lifting type or the like is provided in the opening of the working space. It has a configuration.

[0003] Since the draft chamber uses a lot of chemicals such as acid and alkali, the side plate, the back plate and the ceiling plate surrounding the working space have a structure in which a chemical resistant interior plate is integrally fixed to a main body made of steel or the like. When the interior plate is made of non-metal such as synthetic resin plate, it is bonded to the main body with an adhesive, and when the interior material is a metal plate such as stainless steel, it is integrated by welding. Many.

[0004]

Since the main body and the interior board are made of different materials, when the draft chamber is discarded for recycling or landfilling, the main body and the interior board are separated (separated). Must.

However, in the prior art, when the interior board is adhered to the main body, it is extremely troublesome to separate the interior board, and the adhesive remains on the main body and the interior board. There has been a problem that the environment is degraded when it is landfilled. On the other hand, when the interior material was welded, the separation work was practically impossible.

[0006] Even before the draft chamber is discarded, if the interior material is damaged or deteriorated, or if the performance required for the interior material changes due to a change in work content, it is necessary to replace the interior plate.

[0007] However, when the interior material is adhered, the interior plate is forcibly peeled off, the adhesive stuck to the main body is scraped off with a spatula-shaped device, and then a new adhesive is applied. Since the material is replaced, not only the replacement work is extremely time-consuming, but also the interior material has to be manually held until the newly applied adhesive dries, resulting in poor work efficiency.

On the other hand, when the interior material is welded to the main body, it is practically impossible to replace the interior material, so that there is a problem that flexibility is poor.

The object of the present invention is to improve such a situation.

[0010]

According to the first aspect of the present invention, all or a part of the members surrounding the work space is formed by a multi-layer structure of an interior plate facing the work space and a main body overlapping the interior plate from outside. The interior board is detachably fixed to the main body in a non-adhered state.

According to the invention of claim 2, in claim 1,
It is characterized in that the interior plate is set to a size that can be taken in and out of the work space.

According to a third aspect of the present invention, in the first or second aspect, the interior plate is pressed and fixed to the main body via a pressing member which overlaps the interior plate from the working space direction. I do.

Further, according to the invention of claim 1, in claim 3, the holding member is formed to have a cross-sectional shape overlapping the edge of the interior material and the main body and to extend over substantially the entire length of each side of the interior material. The pressing member is covered with a cover, and a gap between adjacent covers is closed with a sealing agent that can be peeled off with a certain force when dried.

In the present invention, the draft chamber is a broad concept including not only movable chambers but also experimental facilities installed in buildings.

[0015]

In each of the claims, since the interior material is fixed to the main body in a non-adhered state, it can be separated into the interior material and the main body.

Therefore, the separation operation after discarding the draft chamber is easy, and the adhesive is not used. Therefore, the environment does not deteriorate due to the adhesive when dissolving or landfilling.

When the interior material is replaced, the interior material may be removed from the storage space to the outside, a new interior material may be inserted into the storage space, and then replaced. That is, only the interior material can be easily replaced without moving the draft chamber.

In general, a large number of draft chambers are often used side by side, and many drafts are connected to a large number of wirings and pipes, so that it takes a lot of time and effort to move the draft chambers. The configuration of item 2 has a great merit.

As means for holding and fixing the interior material to the main body, simple screwing may be used. However, in the case of screwing, the interior material floats between adjacent screws, resulting in incomplete sealing. If the interior material is a brittle material such as a synthetic resin plate, there is a concern that problems may occur depending on the material and thickness of the interior material, such as being broken by the pressing force of the screw.

In this regard, when the pressing member is used as in claims 3 and 4, the pressing force can be applied to a wide area, so that no matter what material or thickness the interior material is, There is an advantage that floating can be prevented to ensure the sealing property between the interior material and the main body, and that cracks can be prevented.

Further, according to the structure of the fourth aspect, even if the interior material is slightly displaced, it can be firmly pressed and fixed, so that the dimensions of the interior material are adjusted so that there is some allowance between the end surface of the interior material and the holding member. By setting it, the labor of processing the interior material can be reduced, and the gap on the inner surface of the storage space can be sealed with a peelable sealant, so that the efficiency of sorting and replacing the interior material can be improved. There is an advantage that the sealing property of the working space can be improved without any loss.

In the case where the interior material is a brittle material such as a synthetic resin or a calcical plate, the edge of the interior material may be chipped due to contact with experimental equipment during use of the draft chamber. In this case, the edge of the interior material is protected by the pressing member, that is, since the pressing member serves as a cover for the edge of the interior material, there is an advantage that the interior material can be prevented from being chipped and the durability can be improved.

[0023]

Next, embodiments of the present invention will be described with reference to the drawings.

(1) First Embodiment (FIGS. 1 to 19) FIGS. 1 to 19 show a first embodiment (main embodiment).

{Outline} First, an outline of the draft chamber will be described with reference to FIGS. 1 is a schematic perspective view of the whole, FIG. 2 is a partially cutaway front view, FIG. 3 is a sectional view taken along the line III-III of FIG. 2, and FIG. 4 is a sectional view taken along the line IV-IV of FIG.

As shown in FIGS. 1 to 4, the draft chamber includes left and right side plates 1, a ceiling plate 2, and a back plate 3.
And a table 4. A guide frame 5 for guiding the inflow of air is provided at the front end of the table 4. The front surface of the side plate 1 is fixed to the front support 6,
Is fixed to a rear support 7 (see FIG. 4).

A left and right side plate 1, a back plate 3, a table 4, and a ceiling plate 2 constitute a working space 8 having an opening facing forward, and the opening of the working space 8 is guided by a rear support 7 to ascend and descend. The front door 9 is arranged. A sliding glass plate (transparent plate) 10 is fitted into the front door 9.

The ceiling plate 2 is located at a position lower than the upper end of the side plate 1, and an upwardly directed exhaust duct 11 is attached to a rear middle portion between the left and right portions. An illumination unit 12 that extends long in the left-right direction is arranged at a front portion of the ceiling plate 2.

As shown in FIGS. 1 and 3, below the front end of the ceiling plate 2, a fixed window 13 in which a glass plate is fitted into a frame is arranged. Inspection door 1
4 is covered from the front. The front door 9 is located on the front side of the fixed window 13, and a gap is provided between the fixed window 13 and the inspection door 14 to allow the front door 9 to move up and down.

A pair of front and rear pulleys 15 are attached to the inner surface of the upper end of the side plate 1, and a wire (or belt) 16 is wound around the pulley 15.
The front end of 6 is fixed to the front door 9, and the rear end of the wire 16 is fixed to the balance weight. As will be described later,
The rear support 7 also serves as a guide for raising and lowering the balance weight.

As shown in FIG. 4, a large-sized window hole 17 is formed in the back plate 3, and the window hole 17 is closed by a detachable support frame 18, and the support frame 18 is used for equipment for experiments or the like. Class 1
9 is attached. The pipes 20 and the cords and cables connected to the instruments 19 are drawn out to the back side.

A baffle plate 21 is attached to the front surface of the back plate 3 via a spacer (not shown). The baffle plate 21 has a hole 22 slightly larger than the support frame 18.
The air is drawn into the back side of the baffle plate 21 from the hole 22. An inclined guide plate 23 is disposed above the baffle plate 21.

The table 4 is supported by a front beam 24 and a rear beam 25 connected to the left and right side plates 1. An operation panel 26 is provided in front of the front beam 24. A storage space 27 is vacant below the table 4, and a plurality of curtain plates 28 are arranged side by side in a portion near the storage space 27.

The upper end of the curtain 28 is bent like a hook.
An upper locking member 29 for hooking the upper end of the curtain plate 28 and a lower locking member 30 for regulating the position of the lower end of the curtain plate 28 are arranged between the left and right plates 1. These upper and lower locking members 29 and 30 also play a role of reinforcement.

A power distribution board (distribution board) 31 with a door is arranged on the inner surface of one side plate 1 (left side plate) in the storage space 27. Although not shown in the figure, the door of the distribution board 31 is attached to the box so that it can rotate freely with a hinge, and the breaker can be easily turned on by opening the door.
・ Off operation can be performed.

Next, details of each part will be described with reference to FIGS.

{Structure of Side Plate 1} In addition to FIG.
The side plate 1 will be described with reference to FIG. 5 and 6 are perspective views of the side plate 1, FIG. 7 is a partial perspective view, FIG. 8 is a partially enlarged perspective view, and FIG. 9 is an exploded perspective view.

As shown in the schematic diagram of FIG. 1, the side plate 1 has an upper plate 1a and a lower plate 1b substantially at the height of the table 4.
And the upper and lower side plates 1a, 1b
Are held in a single plate by the front and rear supports 6, 7 and a connecting member (not shown).

The upper plate 1a is composed of a main body 33 shown in FIG.
And an interior material 34 arranged at a position corresponding to the work space 8 on the inner surface thereof.

The main body 34 of the upper plate 1a is entirely made of a metal plate (steel plate), and a reinforcing frame 35 having a rectangular cross section is formed on the inner surface on the four sides thereof. The bar 36 is provided integrally, and a vertically long reinforcing portion 37 is provided below the lowermost horizontal bar 36. Although the reinforcing frame 35 and the reinforcing portion 37 have different members fixed by welding, they may be formed by bending.

On the other hand, the interior board 34 is made of a chemical-resistant and heat-resistant material, such as a quartz board, a vinyl chloride board, a stainless steel board, a high-pressure melamine resin board, an ether resin board, a polyether resin board, and a kettle resin. Various materials such as a plate can be used.

The interior material 34 may be a single layer, or may have a variety of structures according to the type of chemicals to be used and the contents of experiments, such as laminating a plurality of materials having different materials or performing surface treatment. it can.

For example, as shown in the perspective views of FIGS.
The four edges of the interior material 34 are pressed and fixed to the main body 33 by the pressing members 38. That is, the holding member 38
Is a portion overlapping the interior material 34 and a reinforcing frame 35 of the main body 37.
And a groove portion having a U-shaped cross section overlapping the horizontal rail 35, and the interior material 34 is fixed to the main body 33 by screwing a screw 39 penetrating the pressing member 38 into the main body 33.

The holding member 38 has a certain area of the interior material 3.
4, it is sufficient that there is some gap between the end surface of the interior material 34 and the pressing member 38. Therefore, the dimensions of the interior material 34 may be set with some dimensional allowance. In other words, even if the cut is rough, it can be firmly fixed.

The pressing member 38 has a length substantially equal to the length of the side of the interior material 34, and has a locking claw 40 formed on the inner surface of the groove. The pressing member 38 has the same cross-sectional shape as a whole by, for example, extruding aluminum or an aluminum alloy, and is covered with a synthetic resin cover 42 having an engaging claw 41 that engages with the locking claw 40. ing.

The holding member 38 can be made of a synthetic resin or a metal plate. The cover 42 is not always necessary if the holding member 38 is made of a chemical-resistant material such as a stainless steel plate and the screw 39 is made of a chemical-resistant metal or a synthetic resin cap. No interior material 34 is required for the lower plate 1b.

The side plate 1 does not need to be separated vertically, and the main body is formed as a single plate.
The interior material 34 may be attached to a location between the ceiling panel 2 and the ceiling board 2. Further, the main body 33 of the side plate 1 does not need to be formed in a state in which the entire body is covered with a plate, and may be formed in a frame shape by a member made of sheet metal or extrusion. Furthermore, the interior material 34 is
It is possible to adopt a configuration in which a plate material is stretched on a frame such as a rectangle.

{Backboard 3} The backboard 3 is mainly composed of FIGS.
It is shown in FIG. 10 is a cutaway perspective view, in which the back plate 3 is separated into an upper back plate 3a and a lower back plate 3b, as shown in FIG.

The upper and lower back plates 3a, 3b are composed of a main body 45 made of a metal plate (steel plate) and an interior material 46 superposed on the front surface thereof. 11 is a rear view of only the main body 45, FIG. 12 is a partial perspective view of the main body 45 as viewed from the back, and FIG.
It is the fragmentary perspective view which looked at the main part 45 of b from the back side.

As shown in FIGS. 10 to 13, the above-mentioned three window holes 17 are formed in the lower back plate 3b.
Further, a reinforcing portion 47 is provided on the back surface of the main body 45.

The interior material 46 is fixed to the main body 45 by a pressing member 38 as in the case of the side plate 1. As shown in FIG. 8, a cover 42 for a pressing member 38 for fixing the left and right side edges of the interior material 46 in the back plate 3 and a cover 42 for a pressing member 38 for pressing and fixing the rear edge of the interior material 34 in the side plate 1 The gap between them is closed with a sealing agent 48 having an adhesive force which can be peeled off with a certain force after drying like a silicone resin without any traces.

As shown in FIG. 10, a gap between the cover 42 and the pressing member 38 which is vertically adjacent is also sealed with a sealant 48. Further, as shown in FIG.
The gap between the cover 42 and the table 4 with respect to the pressing member 38 for fixing the lower edge of the interior material 34 in the side plate 1 is also closed by the sealant 48. In addition, without using the cover 42,
The entire holding member 38 may be covered with the sealing agent 48.

As shown by the dashed line in FIG.
Alternatively, a seal curtain 48 'made of a soft resin may be integrally provided by an appropriate means such as a co-extrusion method. In this case, the shape of the seal curtain 48 'can be freely set as necessary, and the seal curtains 48 of the adjacent covers 42 may be set so as to overlap each other, or set so as to hit the interior material 35. May be.

The back plate 3 may be an integral structure without being divided into upper and lower parts. However, instruments 19 for experiments and work are often provided at the lower part of the back plate 3, and the back plate 3 is provided at the lower part. Is easily damaged by chemicals.
Splitting the upper and lower parts has the advantage that only the damaged part can be replaced.

{Connection of Side Plate 1 and Back Plate 3} FIG. 14A is a sectional view taken along the line XIV-XIV of FIG. 2, and FIG.
14B is a cross-sectional view as viewed in CC, and FIG. 14C is a cross-sectional view as viewed in CC in FIG. 14A. As shown in FIG.
It is formed in an L-shaped plane cross section that overlaps the reinforcing frame 36 of b and the reinforcing portion 47 of the back plate 3.

The hook-shaped claws 4 are provided on both side edges of the rear support 7.
9 and 50 are provided at appropriate intervals in the vertical direction.
9, 50, the reinforcing frame 36 of the upper and lower side plates 1a, 1b and the back plate 3
And a slot 51 formed in the reinforcing portion 47 of the second member.

In this case, as shown in (B), the claws 49, 50 for the upper and lower back plates 3a, 3b are formed in an upward hook shape, and as shown in (C), the claws 49 'for the upper plate 1b.
Is formed in an upward hook shape, and the claw 50 'for the lower plate 1b is formed in a downward hook shape.

The draft chamber is of an assembling type (knock-down type). First, the lower plate 1a and the front and rear
4, 25, the lower part of the table 4 and the like are assembled, and then the downwardly extending claws 50 'of the rear support 7 are fitted into the engagement holes 51 of the lower plate 1b, thereby allowing the rear support 7 to stand on its own. The upper plate 1a and the upper and lower back plates 3a and 3b are mounted in this order. For this reason, the upper and lower side plates 1
The claws 49 ', 50' for a, 1b are turned upside down.

The engagement by the engagement of the claws 49, 50,... With the engagement holes 51 is temporary, and finally, as shown in FIG. Each member is fastened.

A guide rail 52 having a substantially C-shaped cross section is attached to the rear support 7, and a pair of left and right guide rollers 53 fitted into the guide rail 52 guides the lifting and lowering of the balance weight 54.

{Ceiling Panel 2} FIG. 15 is a plan sectional view taken along the line XV-XV of FIG. 2. As shown in FIGS. Board body 5
5 and an interior material 57 superposed on the lower surface thereof, and four peripheral edges thereof are fixed by the main body 55 by the pressing members 38.

As shown in FIG. 10, a downwardly hook-shaped bent portion 55a formed at the rear of the main body 55 of the ceiling plate 4 is fitted into the main body 45 of the upper back plate 3a, whereby the ceiling plate 2
And the upper back plate 3a are held so as not to be displaced back and forth.

Further, outward projecting portions 58 are formed on both right and left side edges of the ceiling plate 2, and the projecting portions 58 are formed on the upper plate 1a.
Are fixed on the horizontal rail 36 with screws 59.

In this case, the upper plate 1a is provided with three horizontal rails 36.
Is provided, the height of the ceiling plate 2 can be changed to three types with one type of side plate 1. That is, the ceiling plate 2
Even if the heights of the side plates 1 are different, only one type of side plate 1 is sufficient, and there is an advantage that the number of types of members can be reduced and the cost can be suppressed.

Needless to say, the number of the horizontal rails 36 is not limited to three, but may be two or four or more. Further, the support means of the ceiling plate 2 is not limited to the horizontal rail 36, and other support means such as outwardly extending portions may be provided in a plurality of stages. Further, a structure that does not need to be screwed may be provided by providing downward hook-shaped claw pieces on both left and right sides of the ceiling plate 2 and dropping the hook pieces into the holes of the upward opening formed in the horizontal rail 36. Furthermore, the horizontal beam 36
One support member such as may be attached so that the height can be adjusted.

In the case of this embodiment, since the bent portion 55a of the main body 55 of the ceiling plate 2 is fitted into the upper back plate 3a, if the height of the ceiling plate 2 is different, the height of the back plate 3 is also different. As in the present embodiment, the back plate 3 is made up of the upper back plate 3a and the lower back plate 3a.
b, the lower back plate 3b is shared irrespective of the height of the ceiling plate 2, and only the upper back plate 3a needs to be prepared for the height of the ceiling plate 2 only. There is an advantage that costs can be suppressed by reducing the number of types.

The back plate 3 is provided with one or a plurality of support means such as horizontal rails, and the ceiling plate 2 is supported by this. You may be able to.

{Lighting Unit 12 and Inspection Door 14} FIG. 16 is a cross-sectional view taken along the line XVI-XVI of FIG. 15, and as shown in this drawing, the lighting unit 12 includes a lighting box 61 mounted on the ceiling plate 2; A long tubular lamp (fluorescent lamp) placed inside
62 and a glass plate 64 attached to an illumination hole 63 provided in the ceiling plate 2.

The illumination box 61 is provided with a lid 65 which is flipped up and rotatable. Also, the glass plate 64
Are mounted on the ceiling plate 2 via the edge 66.

FIGS. 17 to 19 show the structure of the inspection door 14. 17 and 19 are separated perspective views, and FIG. 18 is a sectional view showing the open / closed state. As shown in these figures,
A bent portion having a U-shaped cross section is formed on both left and right side edges 14 a of the inspection door 14.

At the upper and lower two portions of the left and right side edges 14a,
An engagement hole 67 opened in the left-right direction and an insertion hole 68 opened on the back side are formed so as to communicate with each other. Engagement hole 6
7 extend above the insertion hole 68, and
A screw 69 with a head 69a attached to the inner surface of the front support 6
Is inserted.

The groove width of the engagement hole 67 is smaller than the outer diameter of the head 69a of the screw 69, and the groove width of the insertion hole 68 is
The dimension is set to be larger than the outer diameter of 9a. Therefore,
With the screw 69 attached to the front support 6 in advance, the inspection door 14
When the inspection door 14 is shifted downward after the insertion hole 68 is inserted into the screw 69, the screw 69 is inserted into the engagement hole 67, and the inspection door 14 is held so as not to be able to shift back and forth.

Then, as shown in FIG. 18B, the inspection door 1
By displacing the upper part 4 upward, the inspection door 14 can be tilted down and turned around the lower screw 69, but the inspection door 14 may come off until the insertion hole 68 is left open. For this reason, a shutter plate 70 for closing the lower insertion hole 68 is fixed with a screw 71.

As shown in FIG. 19, the inspection door is mounted with the shutter plate (shutter means) 70 out of the insertion hole 68, and then the inspection door 14 is once opened to expose the back side.
Then, the insertion hole 68 is closed with the shutter plate 70 by tightening the screw 71 while returning the posture. Then, the lower screw 6
9 cannot be removed from the engagement hole 67, so that the inspection door 14 can be easily opened and closed without impairing the ease of attachment.

Note that the suspension means of the inspection door 14 is not limited to the head screw 69, but may be any protrusion such as a headless screw or pin. Also, as in the present embodiment, the lighting box 6
If the first door 65 is configured to be opened and closed, the replacement of the lamp 62 is easy.

In the present embodiment, the members constituting the draft chamber are unitized, and are assembled (knock-down type) centering on a connecting means composed of a combination of a claw and an engagement hole. For this reason, the draft chamber can be assembled on site and is easy to transport.

{Summary} Damaged interior materials 34, 46,
57 and the interior materials 3
If it becomes necessary to replace the 4, 46, 57, it is necessary to raise the front door 9 to the upper limit to open the working space 8 large. The interior material 34, 4 is removed by removing the holding member 38 by loosening the screw 69 and then removing the holding member 38.
6, 57 are removed from the work space 8, and then the interior material 3
4, 46, 57 are removed from the working space 8 to the outside of the draft chamber, and then new interior materials 34, 46, 5
7 may be attached.

As described above, the interior materials 34, 4 can be prepared without moving or disassembling the draft chamber.
6,57 can be easily replaced. Since no adhesive is used, the side plate 1, the back plate 3, and the ceiling plate 2 are combined with the main body 33, 45, 55 and the interior material 3 after the draft chamber is discarded.
It is easy to perform the separation work of separating into 4, 46, and 57, and it is possible to prevent the generation of harmful components when dissolving or landfilling.

Incidentally, any of the side plate 1, the back plate 3, the ceiling plate 2, and the table 4 can be configured as the present invention. Further, for example, it is also possible to have a multilayer structure in which only the lower part of the side plate 1 and the back plate 3 can be separated.

(2) Another Embodiment (FIGS. 20 to 22) FIGS. 20 to 23 show another embodiment. In the second embodiment shown in FIG. 20, a screw 39 is penetrated through the holding member 38 and the interior materials 34, 46, 47, and the three members are fastened together by the screw 71.

As in this example, the screws 39 are attached to the interior materials 34, 4
6, the holding position of the interior materials 34, 46, 57 can be set freely, so that even if the interior materials 34, 46, 57 have a large area or a large length or width, the main body 3
3, 45, 55 can be firmly fixed.

In the third embodiment shown in FIG. 21, the side edges of the two interior members 33 and 45 arranged in an orthogonal posture are fixed to the rear corner post 7 ′ by one pressing member 38.

In the fourth embodiment shown in FIG.
Seal plate 77 made of rubber or the like (including a gasket or the like) between 4, 46, 57 and the main body 33, 45, 55
Is interposed. Holding member 38 and interior materials 34, 46,
The seal plate 72 may be interposed between the seal plate 72 and the seal 57. In the present embodiment, the main bodies 33, 45, and 55 are made of a thick plate such as plywood.

In the present embodiment, the entire peripheral edge of each of the interior boards 35 is in close contact with the main body 33, so that it is easy to ensure the sealing performance. Of course, interior materials 3
Is not essential, and, for example, the interior materials 35... Are overlapped and fixed on the projections provided on the body 33, and the adjacent interior materials 35. The space between the working space 8 and the outside may be secured by shielding the space with a sealing means such as a sealing material 48.

(3) Others The present invention can be variously embodied in addition to the above. For example, the draft chamber is not limited to the front opening type, and may have a structure in which one or both sides are opened in addition to the front side.

The cross-sectional shape and length of the holding member can be freely changed as needed. Further, the fastening means of the holding member is not limited to the screw, and other fastening means such as a lever using a cam may be employed.

Further, although the draft chamber is generally rectangular in plan view, it can be formed in another planar shape such as a circle.

[Brief description of the drawings]

FIG. 1 is an external perspective view of a draft chamber according to a first embodiment.

FIG. 2 is a front view of a draft chamber.

FIG. 3 is a sectional view taken along the line III-III of FIG. 2;

FIG. 4 is a sectional view taken along line IV-IV of FIG. 3;

FIG. 5 is an exploded perspective view of an upper plate and a ceiling plate.

FIG. 6 is an exploded perspective view of a side plate.

FIG. 7 is a partial perspective view of a side portion of the draft chamber.

FIG. 8 is a partial perspective view of a rear corner portion of the draft chamber.

FIG. 9 is an exploded perspective view of a main part.

FIG. 10 is a cutaway perspective view of the rear part of the draft chamber.

FIG. 11 is a separate rear view of the ceiling plate and the back plate.

FIG. 12 is a perspective view of the back plate viewed from the back side.

FIG. 13 is a perspective view of the lower back plate viewed from the back side.

FIG. 14 is a partial sectional view taken along the line XIV-XIV in FIG. 2.

15A is a sectional view taken along line XV-XV in FIG. 2, FIG. 15B is a sectional view taken along line BB in FIG. 2A, and FIG. 15C is a sectional view taken along line CC in FIG.

16 is a sectional view taken along the line XVI-XVI in FIG.

FIG. 17 is an exploded perspective view of a front support and an inspection door.

FIG. 18 is a cross-sectional view showing the operation of opening and closing the inspection door.

FIG. 19 is a partial perspective view showing a procedure for attaching the inspection door.

FIG. 20 is a diagram illustrating a second embodiment.

FIG. 21 is a diagram showing a third embodiment.

FIG. 22 is a diagram showing a fourth embodiment.

[Brief description of reference numerals]

 DESCRIPTION OF SYMBOLS 1 Side plate 2 Ceiling plate 3 Back plate 4 Table 6 Front support column 8 Work space 9 Front door 12 Lighting unit 14 Inspection door 33, 45, 55 Main body 34, 46, 57 Interior material 38 Pressing member 39 Screw 42 Cover 48 Sealant

Claims (4)

[Claims] 1. A part or all of the members surrounding a work space have a multi-layer structure of an interior plate facing the work space and a main body overlapping the interior plate from outside, and the interior plate is attached to the main body. Draft chamber fixed detachably in a non-adhered state. 2. The draft chamber according to claim 1, wherein the interior plate is set to a size that can be taken in and out of a working space. 3. The draft chamber according to claim 1, wherein the interior plate is pressed and fixed to the main body via a pressing member that overlaps the interior plate from the direction of the working space. 4. The holding member is formed in a cross-sectional shape that overlaps the edge of the interior material and the main body, and has a length extending over substantially the entire length of each side of the interior material. 3. A gap between the covered covers is closed with a sealant that can be peeled off with a certain force when dried.
Or the draft chamber according to claim 3.