JP7269682B2 - Dust collection unit for ventilation booths and ventilation booths - Google Patents

Description

Article 30, Paragraph 2 of the Patent Act applies From October 6th to 7th, 2018, a presentation with a demonstration will be held at the Volks Osaka showroom.

Article 30, Paragraph 2 of the Patent Act applies From October 13th to 14th, 2018, a public trial session will be held at craft space NextGate

Application of Patent Law Article 30, Paragraph 2 On October 20, 2018, exhibited at the Kyoto Kujo-yu Flea Market ~Maki no Maki~

Patent Law Article 30, Paragraph 2 applies Exhibited at Modelers Festival 2018 from October 27 to 28, 2018

The present invention relates to a ventilated booth with a work space and a dust collection unit used in the ventilated booth.

In order to exhaust odors generated from organic solvents and chemicals during painting work in model work, molding work for resin works, chemical experiments, etc., an exhaust unit is installed at the back of the work table and above the work table. Desk-top ventilation booths are widely used, which have a structure in which the air in the space is sucked by an exhaust unit.

In addition, an exhaust unit is arranged directly above the worktable, and a suction mechanism having an air passage connected to the duct is arranged behind the worktable, and the air from the exhaust unit is directed along the surface of the worktable. There is also a ventilator configured to lead to a suction mechanism (see Patent Document 1).

Further, in the inside of the box-shaped main body having an open front, a rectifying plate whose surface is inclined so as to approach the bottom as it goes rearward is arranged with a predetermined gap from the inner surface of the main body. There is a ventilation booth in which an exhaust unit is integrally provided on the top surface of the unit (see Non-Patent Document 1). In this ventilation booth, when the fan rotates, the wide space behind the rectifying plate in the main body becomes a static pressure chamber with negative pressure, and the negative pressure is kept constant, so the air in front of the rectifying plate is A flow of air is created that is sucked into the static pressure chamber through the gap and exhausted from the exhaust unit.

Japanese Patent No. 4551984

GATTOWORKS Store (operated by GATTOWORKS Co., Ltd.), Introduction page of "New Nero Booth (painting booth)", https://www.gattoworks.net/

The tabletop ventilation booth of Non-Patent Document 1 has a simple configuration and yet has a high suction force. An object of the present invention is to quickly remove debris and dust generated by work from the work space in a ventilation booth that operates on the same principle as the booth of Non-Patent Document 1.

The ventilation booth according to the present invention includes a box-shaped main body portion having an open front surface, a rectifying plate supported inside the main body portion with its main surface facing the front opening portion, a fan and its drive. an exhaust unit with built-in parts and an air intake and exhaust port.

The straightening plate is supported inside the main body with the end face on the bottom side separated from the inner bottom surface of the main body by a predetermined amount of gap.

A through hole that communicates with the space is formed at a location corresponding to the space on the back side of the rectifying plate on any surface of the body portion other than the front surface and the bottom surface. The exhaust unit is connected to the main body in such a posture that the suction port faces the through hole.

According to the ventilation booth with the above configuration, the space on the front side of the rectifying plate in the main body is used as a work space, and by rotating the fan, the space on the back side of the rectifying plate functions as a static pressure chamber, and the fan rotates. Air sucked in from the opening on the front is moved along the front of the rectifying plate and guided to the static pressure chamber behind it. can.

Further, at the bottom of the main body of the ventilation booth, a dust collecting unit is provided for rapidly removing debris and dust generated in the work space from the work space. This dust collection unit has a height that allows it to be inserted into the space on the back side of the straightening plate through the gap between the inner bottom surface of the main body and the straightening plate, and has a plurality of slit holes or holes formed under the top plate. A space for collecting dust is provided in the body, and an opening connected to the space is provided on the back surface. The rear portion including the back surface is inserted into the space on the back side of the rectifying plate through the gap, and is arranged on the bottom portion of the main body.

By arranging the dust collection unit as described above, when the fan of the exhaust unit rotates and the space on the back side of the straightening plate becomes a static pressure chamber where negative pressure is applied, A force is generated to suck out the air in the space toward the static pressure chamber through the opening on the back. Due to this force, part of the air in the work space on the front side of the rectifying plate is guided to the internal space of the dust collection unit through the slits or pores on the top surface of the dust collection unit, and together with that air, the air in the work space Debris and dust are also sucked into the dust collection unit. Therefore, fine chips and dust generated in the work chamber during cutting work or the like can be quickly collected into the dust collection unit, or guided from the dust collection unit to the static pressure chamber and discharged to the outside.

In the present invention, inside a box-shaped main body portion having an open front surface, a rectifying plate having a main surface facing the opening of the front surface is provided so that the end face on the bottom side thereof is separated from the inner bottom surface of the main body portion by a predetermined amount. A dust collection unit is provided at the bottom of the main body of the ventilation booth, which is supported in a state separated from the As the space becomes a static pressure chamber, part of the air in the work space on the front side of the straightening plate is sucked into the dust collection unit, and debris and dust in the work space are also sucked into the dust collection unit along with the air. As a result, scraps and dust generated by the work can be quickly removed from the work space.

1 is a perspective view showing the appearance of a tabletop ventilation booth to which the present invention is applied; FIG. It is an exploded perspective view showing the structure of the main-body part of the said desktop ventilation booth. FIG. 3A is a cross-sectional view showing the internal structure of the tabletop ventilation booth; FIG. 4 is an explanatory diagram showing the flow of air generated inside the tabletop ventilation booth. Fig. 2 is a perspective view showing the appearance of a tabletop ventilation booth having a drying unit on the top; FIG. 6 is an explanatory diagram showing the flow of air generated inside the desktop ventilation booth of FIG. 5; Fig. 2 is a perspective view showing the appearance of a tabletop ventilation booth having a dust collection unit at the bottom; FIG. 8 is an explanatory diagram showing the flow of air generated inside the desktop ventilation booth of FIG. 7;

FIG. 1 shows the appearance of a tabletop ventilation booth B (hereinafter simply referred to as "ventilation booth B") to which the present invention is applied, and FIG. 3 indicates the internal configuration of the main body 1 .

The ventilation booth B of this embodiment has a box-shaped main body 1 with an open front, and two rectifying plates 2A and 2B are arranged in the front-rear direction with the front main surface facing the front opening. , and an exhaust unit 3 is integrally provided on the top surface of the main body 1 . As shown in FIG. 2, the main body 1 includes a metal frame 10 that forms a cubic skeleton, and a square frame that is attached to each frame except for the front side of the frame 10 and closes the opening in the frame. It is composed of a rectangular panel member 20 and a rectangular panel member 25 attached to the upper end portion of the front opening.

The frame 10 includes a pair of vertical frames 11, 11 forming frames on both sides, three horizontal frames 12f, 12c, 12b connecting them on the top side, and the back side of each vertical frame 11, 11. It is formed by a horizontal frame 13 connecting the bottoms (see FIG. 2). The horizontal frames 12f, 12c, 12b and 13 are L-shaped angles, and the vertical frame 11 is also formed by welding a plurality of L-shaped angles. The horizontal frames 12f, 12c, 12b, 13 and the vertical frame 11 are connected via screws (not shown).

Panel members 20 and 25 and current plates 2A and 2B are plates made of resin (for example, plastic cardboard). The panel members 20 and 25 are detachably attached to the outer surface of the frame 10 with double-sided tape, and the rectifying plates 2A and 2B are inclined toward the inner bottom surface of the main body 1 toward the rear by a plurality of connecting fittings 4. It is connected to the frame 10 in such a posture (see FIG. 3).

The side frame formed by the vertical frame 11 includes a support frame 11c elongated in one direction. This support frame 11c is also an L-shaped angle, and is bridged between the upper and lower frames of the vertical frame 11 (a pair of frames extending in the front-rear direction) with the length direction aligned with the vertical direction. The center frame 12c of the three horizontal frames 12f, 12c, 12b on the top also functions as a support frame.

The exhaust unit 3 incorporates a fan 31 and a drive unit (not shown) including a fan motor inside a case body 30 having a square cross section. (not shown) is provided, and an exhaust port (not shown) is provided on the upper surface. Mounting pieces 32 each having a pair of screw holes (not shown) are continuously formed on the outside of two opposite sides of the bottom surface of the case body 30 . A cylindrical duct portion 34 (see FIG. 3A) is provided integrally with the exhaust port on the upper surface of the case body 20, and a duct hose 35 (see FIG. 1) is connected to the duct portion 34. As shown in FIG. The duct hose 35 is attached to the window or ventilation opening of the room in which the ventilation booth B is arranged in order to release the air sucked from the exhaust unit 3 to the outside.

The side and top support frames 11c and 12c of the frame 10 are separated from the respective back frames 11b and 12b by a distance equal to the width of the bottom of the exhaust unit 3 excluding the mounting piece 32 of the case body 30. deployed separately. Each of these frames 11b, 11c, 12b, 12c is formed with a pair of screw holes 15, 15 spaced apart at intervals equal to the intervals of the screw holes of the mounting piece 32. As shown in FIG.

One of the five square panel members 20 mounted on the frame 10 (indicated by reference numeral 20A) has a square with a size capable of including the suction port of the case body 30 at one corner. A through hole 21 having a shape is formed, and a pair of screw holes 22, 22 are provided on the outer sides of two opposing sides of the through hole 21 (see FIG. 2). The positional relationship of these screw holes 22 also conforms to the positional relationship of the screw holes of the exhaust unit 3 .

In this embodiment, a panel member 20A having a through hole 21 and a screw hole 22 is attached to a top frame including a support frame 12c with the respective screw holes 22 and 15 aligned. Further, the exhaust unit 3 with the mounting piece 32 aligned with the formation range of the screw hole 22 of the panel member 20A is connected to the panel member 20A and the support frame 12c by the truss screw 33. As shown in FIG. By this connection, the exhaust unit 3 is fixed to the top surface of the main body 1 with the suction port facing the through hole 21 .

The above panel member 20A can also be attached to the left or right frame (vertical frame 11) including the support frame 11c, and by doing so, the side surface of the main body 1 can also be connected to the exhaust air by a connection method similar to that described above. Unit 3 can be fixed (see double-dotted line in FIG. 1). Therefore, based on the positional relationship between the windows and vents of the room in which the ventilation booth B is installed and the ventilation booth B, the most suitable surface for installing the exhaust unit 3 is selected from the left and right sides and the top surface. can be selected and the exhaust unit 3 can be fixed to that surface.

The exhaust unit 3 of this embodiment can switch the rotation speed of the fan motor in multiple stages. Although not shown, a lighting unit having an LED built therein is arranged behind a horizontal frame 12f forming the front end of the top frame of the main body 1. As shown in FIG. This lighting unit is electrically connected to the power supply line of the exhaust unit 3. On the front surface of the case body 30 of the exhaust unit 3, a knob switch 36 for switching on/off and rotation speed of the fan motor and a power supply to the lighting unit are provided. A changeover switch 37 for switching on/off is provided (see FIG. 1). Further, the case body 30 of the exhaust unit 3 can be provided with a filter member for absorbing dust sucked together with the air in a state that it can be pulled out to the outside.

Next, referring to FIG. 3, a support structure for the straightening vanes 2A and 2B will be described.
A connecting fitting 4 used for connecting the current plates 2A and 2B has a first bent portion 41 bent substantially at a right angle and a second bent portion 42 bent at an obtuse angle. It has a configuration in which screw holes 40 are provided on the outer sides of 41 and 42 (see FIG. 3(B)). A portion 43 outside the first bent portion 41 of the connecting fitting 4 is fixed to the frame 10 by a truss screw 7 or a countersunk screw 8, and a portion 44 outside the second bent portion 42 is fixed by a thumbscrew 9 to the rectifying plates 2A, 2A and 2B. 2B (see FIG. 3(A)).

The rectifying plate 2A on the front side is connected to the top frame 11t of the vertical frame 11 via the connecting metal fittings 4 at the locations near the front end of the both side edges of the back surface, and the locations near the rear end of the both side edges of the back surface. It is connected to the front surface of the support frame 11c in the vertical frame 11 on the corresponding side via the connecting fittings 4. As shown in FIG. The rear rectifying plate 2B has its front end surface positioned higher than the rear end surface of the front rectifying plate 2A and is substantially parallel to the rectifying plate 2A. It is connected to the back surface of the support frame 11c in the vertical frame 11 on the corresponding side via the connecting metal fittings 4, and one point of both side edges on the rear end face side is connected to the back frame in the vertical frame 11 via the connecting metal fittings 4. 11b.

With these connections, the front rectifying plate 2A faces the front edge of the top frame of the main body 1 (horizontal frame 12f) with a predetermined gap, and the space up to the front of the support frame 11c is formed. The rear rectifying plate 2B is arranged in a space behind the support frame 11c so that the rear end face faces the rear end edge of the bottom frame (horizontal frame 13) of the main body 1 with a predetermined gap therebetween. Supported. Further, by attaching the straightening vanes 2A and 2B by the method described above, a gap of a predetermined amount is created between the rear end portion of the straightening vane 2A and the front end portion of the straightening vane 2B.

FIG. 4 schematically shows the air flow generated when the exhaust unit 3 is moved in the ventilation booth B described above. When the fan 31 inside the exhaust unit 3 rotates, the air in the space 100 behind the straightening plates 2A and 2B is sucked out, and the space 100 becomes a static pressure chamber with negative pressure. Then, due to the pressure difference between the rectifying plates 2A and 2B, air is sucked from the opening in the front surface of the main body 1, and after hitting the front surfaces of the rectifying plates 2A and 2B, the air flows upward and downward along the surfaces. It is guided to the gap and the gap between the straightening plates 2A and 2B, and then flows into the static pressure chamber 100 through those gaps. The air newly entering the static pressure chamber 100 is also discharged to the outside via the exhaust unit 3, and the negative pressure in the static pressure chamber 100 is maintained, so the air flow described above also continues.

Even when the exhaust unit 3 is arranged on the left side or the right side of the main body 1, the air in front of the rectifying plates 2A and 2B is sucked into the static pressure chamber 100 by the same principle as above, and furthermore, from the static pressure chamber 100 It is discharged outside.

Therefore, if the exhaust unit 3 is moved while the space in front of the rectifying plates 2A and 2B of the main body 1 is used as a working space for painting, cutting, or the like, odors and dust will be generated. Air can be sucked into the static pressure chamber 100 behind the rectifying plates 2A and 2B, guided to the exhaust unit 3, and discharged to the outside of the room via the duct portion 34 and the duct hose 35. Further, after most of the air that has entered the main body 1 from the front opening is received by the front surfaces of the rectifying plates 2A and 2B, the main body 1 is provided with a gap for the front end portion of the top portion of the main body portion 1, a gap for the rear end portion of the bottom portion, and the main body. Since the air is led to the static pressure chamber 100 from three gaps in the middle position of the part 1, it is possible to secure a suction force sufficient to quickly discharge odors and dust generated in the work space to the outside.

However, it is not always necessary to use two rectifying plates, and one rectifying plate may be arranged in an oblique posture in the range from the front edge of the top of the main body 1 to the rear edge of the bottom. Regardless of whether the number of rectifying plates is one or two, it is not essential to provide a plurality of gaps between the main body 1 and the rectifying plates. It is also possible to adopt a configuration in which a gap is provided only for one of the rear edges of the . Alternatively, the gaps between the main body 1 and the front or rear end surfaces of the straightening vanes may be eliminated, and instead, gaps may be formed between the main body 1 and both end faces of the straightening vanes. When two rectifying plates are provided, a gap may be formed only between those rectifying plates.

The inclination of the current plate may be gentler than that shown in FIG. By positioning it farther forward, the baffle may be placed in a near-vertical position. However, it is necessary to secure a sufficient space behind the rectifying plate, and it is necessary to arrange the exhaust unit 3 on the front side of the part forming the space.

Below are two examples of adding optional functions to the basic configuration of the ventilation booth B shown in FIGS.
First, in the booth B1 of the first modification shown in FIGS. 5 and 6, a rectangular through hole 50 is formed in a predetermined range on the front side of the panel member 20A attached to the top frame of the main body 1. , a box-shaped drying unit 5 having an open front surface and a bottom surface is arranged so as to straddle the forming range.

Inside the drying unit 5, a support table 51 is provided for supporting an article W (a model part in the illustrated example) to which paint or the like has been applied in the working space of the main body 1. As shown in FIG. The support base 51 is made of an air-permeable material such as a metal mesh member, and has a bottom surface larger than the through hole 50 .

In the above configuration, when the exhaust unit 3 is moved, as shown in FIG. 6, an air flow similar to that shown in FIG. Air is sucked into the unit 5 , flows through the support base 51 and the through hole 50 into the static pressure chamber 100 , and is discharged from the static pressure chamber 100 to the outside through the exhaust unit 3 . Due to this air flow, the drying time of the article W can be shortened.

A plurality of fine holes or slit holes may be provided instead of the through hole 50 described above. In that case, if a fine hole or a slit is formed so as to surround the range in which the support 51 is arranged, the support 51 made of a non-breathable material can be used.

In the booth B2 of the second modification shown in FIGS. 7 and 8, a box-shaped dust collecting unit 6 is arranged at the bottom of the main body 1. As shown in FIG. The dust collection unit 6 has a base portion 61 (having a U-shaped cross section with open front and back surfaces) having legs integrally provided on both sides of a top plate in which a plurality of pores 60 are formed. and a drawer portion 62 detachably arranged between the legs of the base portion 6 . The rear surface of the drawer portion 62 is also opened.

The dust collection unit 6 has a height that allows it to be inserted deep into the gap between the rear rectifying plate 2B and the bottom of the main body 1, but the depth is set shorter than the depth of the main body 1. , the opening rear surface of the dust collection unit 6 is located between the current plate 2B and the inner rear surface of the main body 1. As shown in FIG. In addition, the pores 60 of the top plate of the base portion 61 are distributed in a rectangular shape in each of the four regions aligned in the front, back, left and right directions. Two regions are positioned in the front half range of the body portion 1, and two rear regions are positioned in the rear half range of the body portion. Also in this example, instead of the fine holes 60, a plurality of slit holes having a minute width may be provided. Further, the configuration of the dust collection unit 6 is not limited to the above, and may be a simple box body with a rear opening.

As shown in FIG. 8, when the exhaust unit 3 is activated and the space 100 behind the rectifying plates 2A and 2B becomes a static pressure chamber where negative pressure is applied, the air inside the dust collection unit 6 is discharged through the rear opening. A suction force is generated toward the static pressure chamber 100 through the air. Due to this force, part of the air in the space in front of the rectifying plates 2A and 2B is sucked into the dust collecting unit 6 through the fine holes 60. As shown in FIG.

According to the above mechanism, when an operation is performed in which fine scraps and dust are generated in the space in front of the straightening plates 2A and 2B of the main body 1, the dropping speed of the falling scraps and dust is increased. , they can be sucked into the dust collection unit 6 through the pores 60 together with air. Fine scraps and dust move from the dust collection unit 6 to the static pressure chamber 100 together with the air, and are further discharged to the outside through the exhaust unit 3 . Scraps and dust remaining in the dust collection unit 6 without moving to the static pressure chamber 100 can also be disposed of by pulling out the drawer portion 62 after the end of the work.

In addition, some modifications will be explained only in sentences.
The main body part 1 of the ventilation booth B of the basic configuration has a structure in which a panel member 20 is attached to each frame except the front face of the frame 10 to close the opening of the frame, but the panel to the bottom frame Attachment of the member 20 is not absolutely necessary. For example, when the dust collection unit 6 described above is deployed, or when it is not necessary to consider dirt on the top plate of the table on which the ventilation booth B is deployed (protected by a dirt prevention sheet or the like, or when ventilation When the booth B is arranged on a stand via a separate support panel, etc.), a configuration in which the panel member 20 is not attached to the bottom frame (that is, a configuration in which the front and bottom are open) The body portion 1 may be used.

In the ventilation booth B of the basic configuration, the frame 1 is cubic in order to unify the size and shape of the panel members. The body portion 1 may be formed by three types of panel members and a frame. Moreover, the panel members 20 and 25 may be attached not only to the outside of the frame 1 but also to the inside.

In the ventilation booth B of the basic configuration, the mounting location of the exhaust unit 3 is located at one corner of the main body 1, but this is not the only option. You may enable it to attach the exhaust unit 3 to. Further, a support frame is also provided at a position separated from either one of the frames 11b and 11b constituting both sides of the frame on the back of the main body 1 by a distance corresponding to the width of the case body 30 of the exhaust unit 3. By providing a screw hole for attaching the exhaust unit 3 to the frame, the exhaust unit 3 can be attached not only to the top surface and both side surfaces of the body portion 1 but also to the rear surface.

According to the ventilation booth illustrated so far, the ventilation unit 3 can be installed at a convenient place for the user based on the positional relationship of the windows and the ventilation openings on the walls of the room in which the ventilation booth is installed, which is convenient. can enhance sexuality. Moreover, no matter where the exhaust unit 3 is attached, a constant suction force can be ensured.

Furthermore, since the rotation speed of the fan motor can be switched in a plurality of steps, the suction force can be adjusted according to the purpose of work. For example, when performing a painting process that requires a fine spray of paint, it is possible to reduce the suction force by reducing the rotation speed to a minimum level to prevent the paint required for application from being forcibly sucked. can. Furthermore, by providing the exhaust unit 3 with a dust-collecting filter section that can be inserted into and removed from the case body 30, the filter section can be easily replaced.

The present invention can provide a complete ventilation booth or can provide a kit for construction containing the components of the ventilation booth for the end user to assemble themselves. For example, the kit for manufacturing the ventilation booth B having the basic configuration shown in FIG. panel member 20 and a small panel member 25 for the front, screws and double-sided tape for connecting them, two current plates 2A and 2B, and connecting fittings 4 and screws 7 for connecting them to the frame 10, 8, 9, exhaust unit 3 and the like.

One of the five panel members 20 is desirably a panel member 20A having through holes 21 and screw holes 22 . However, if the panel is made of resin, it is relatively easy for the user to drill the holes themselves, so it is not always necessary to include the panel member 20A in which holes have already been drilled in the manufacturing kit.

Although it is not essential to provide screw holes in advance in the metal frame that forms the frame 10, it is desirable to provide them. If the panel member 20A with holes drilled is not included in the manufacturing kit, the connection of the exhaust unit 3 provided to the frames 11c, 11b, 12c, and 12b is increased so as to increase the degree of freedom in selecting the mounting location of the exhaust unit 3. There may be three or more screw holes 15 for the exhaust unit 3 and they may be provided at intervals equal to the distance between the screw holes of the exhaust unit 3 .

The build kit can include extra panel members, fittings, screws, and the like. Moreover, the panel member 20 is not limited to resin, and may be a panel member made of cardboard such as reinforced corrugated cardboard. Also, the shape and number of frames forming the frame 10 are not limited to the example shown in FIG. 2, and can be changed as appropriate. Moreover, it is also possible to include the vertical frame 11 to which the connecting fittings 4 are connected in advance in the manufacturing kit.

As shown in FIG. 3, in the ventilation booth B of the basic configuration, a thumbscrew 9 is used to connect the rectifying plates 2A, 2B and the connecting fitting 4 to the frame 10, and the head of the thumbscrew 9 is open. Since it is directed to the front side where the rectifying plates 2A and 2B are facing, even after the assembly of the booth B is completed, the rectifying plates 2A and 2B can be easily removed. The panel member 20 constituting the main body 1 can also be easily removed from the frame 10 by peeling off the double-sided tape. Therefore, even if the rectifying plates 2A, 2B and the panel member 20 become dirty due to the work of spraying paint or the like, they can be replaced with new ones by the user.

When it is desired to change the position of the exhaust unit 3 due to the movement of the ventilation booth B, etc., the exhaust unit 3 is removed and the panel member 20A under it is replaced with the panel member 20 where the new exhaust unit 3 is to be mounted. , the purpose can be achieved by matching the exhaust unit 3 to the replaced panel member 20A and carrying out the mounting work again. Even when the exhaust unit 3 breaks down, it can be easily replaced with a new exhaust unit 3 by performing similar removal/attachment work.

B, B1, B2 Tabletop ventilation booth 1 Main body 2A, 2B Current plate 3 Exhaust unit 6 Dust collection unit 30 Case body 31 Fan 60 Pore 61 Base 62 Drawer

Claims (2)

A box-shaped main body having an open front surface, a rectifying plate supported inside the main body with its main surface facing the front opening, a fan and its driving unit are incorporated, and air is supplied. A ventilation booth comprising an exhaust unit having a suction port and an exhaust port,
The rectifying plate is supported inside the main body with the end surface on the bottom side separated from the inner bottom surface of the main body by a predetermined amount of space,
A through hole communicating with the space on the back side of the rectifying plate is formed on any surface of the body portion other than the front surface and the bottom surface, and the suction port faces the through hole. The exhaust unit is connected to the main body with
A dust collector is placed under a top plate having a height that enables insertion into the space on the back side of the straightening plate through the gap between the inner bottom surface of the main body and the straightening plate, and having a plurality of slits or holes. and an opening connected to the space is provided on the back surface , and the back surface is located behind the bottom of the rectifying plate and in front of the inner back surface of the main body. is inserted into the space on the back side of the straightening plate through the gap, and is disposed at the bottom of the main body.
ventilation booth. A box-shaped main body portion having an open front surface, and the main body portion facing the front opening portion and the end face on the bottom side with a predetermined gap from the inner bottom surface of the main body portion. and a fan and its driving part are incorporated therein, and provided with an air suction port and an air exhaust port. A dust collection unit arranged at the bottom of the main body of a ventilation booth, comprising: an exhaust unit connected to the main body in such a manner that the suction port faces a through hole formed in a location corresponding to the space. hand,
A dust collector is placed under a top plate having a height that enables insertion into the space on the back side of the straightening plate through the gap between the inner bottom surface of the main body and the straightening plate, and having a plurality of slits or holes. and an opening connected to the space is provided in the rear surface , and the rear portion including the rear surface is positioned in front of the inner rear surface of the main body so that the rear surface is located behind the bottom of the current plate and in front of the inner rear surface of the main body. is inserted into the space on the back side of the rectifying plate from the bottom of the main body,
Dust collection unit for ventilation booths.

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