JP2012159280A - Ventilation device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a ventilation device of high work efficiency, capable of smoothly sucking a harmful gas generated during work and discharging the same to the external without diffusing the harmful gas, and further easily installed and moved.SOLUTION: This ventilation device includes: an upper hood 3 supplying laminar flow 2; a lower hood 6 which is positioned below the upper hood 3, whose surface is recessed to be used as a working space 4, and which is provided with a suction opening 5 on the recessed surface; an exhaust box 7 disposed on the upper hood 3; and a wall body 8 disposed between the lower hood 6 and the upper hood 3 and supporting the upper hood 3. The exhaust box 7 above the wall body 8 and the lower hood 6 are connected by a duct 9 along the wall body 8, and the harmful gas flowing above the working space 4 of the lower hood 6 is guided to the suction opening 5 as it is by the laminar flow 2 vertically flowing down from the upper hood 3, to be sucked into the lower hood 6, and discharged to the external from the exhaust box 7 through the duct 9 along the wall body 8.

Description

  The present invention relates to a ventilator for sucking harmful gas generated in a working space where a person is present by a supplied laminar flow without diffusing to the surroundings and removing the harmful gas to the outside.

  If a hazardous gas is generated in a work space where a person is actually working or being monitored, the person must ventilate the outside without inhaling the harmful gas to ensure the safety of the person. The usual practice is to enclose the work space and ventilate it by turning a ventilation fan, and a person extends his / her fingers into the enclosure to perform the work. However, with this method, a large work space cannot be taken, and the work is difficult due to the enclosure. Therefore, what is called a push-pull ventilator that reduces the enclosure of the work space, enables work in an open state, and allows the person to vent the outside from the work space without inhaling harmful gases. is there.

  As shown in FIG. 4, this push-pull ventilator has a flat-shaped pull hood 50 and a push hood 51 that blows a uniform flow disposed on the opposing upper part via a support member 53 with a built-in suction mechanism 52. The air flow drawn in from the suction surface arranged on the flat surface of the pull hood 50 is exhausted outside the apparatus without being circulated to the push hood 51, and the front surface portion 54 and both side surface portions 55 are opened. Therefore, the harmful gas generated from the work on the surface of the pull hood 50 does not diverge to the pull hood 50 without being diffused to the outside due to the uniform downward flow of the slight wind speed that does not reflect even if it hits the surface of the pull hood 50 blown out from the push hood 51. It also serves as a work table for conveyance (see, for example, Patent Document 1).

  Further, as shown in FIG. 5, this push-pull ventilation device includes a pull hood 50A with a built-in suction mechanism and a flat plate-like surface, and a push hood 51A that blows out a uniform downward flow disposed on the upper side. The pull hood 50A and the push hood 51A are completely opened, and the harmful gas generated from the work on the surface of the pull hood 50A is discharged by the uniform downward flow blown out of the push hood 51A. The contaminated area 58 is separated from the clean area 59 where the operator is located, and harmful gas is conveyed into the pull hood 50A without diffusing outside, and the pull hood 50A is also used as a work table ( For example, refer nonpatent literature 1).

Japanese Patent No. 4551984

“Theory and Practice of Factory Ventilation” edited by the Society of Air Conditioning and Sanitation Engineering, published on March 30, 1995, p. 83-84

  The push-pull ventilator of the above-mentioned Patent Document 1 almost lays a work plate 60 on a work table, which is a flat surface of the flat pull hood 50, and performs work on the work plate 60 in actual operation. It is. Since the thickness of the work plate 60 is in the range of 10 mm to 20 mm, the actual work is performed on the work plate 60 located 10 mm to 20 mm higher than the flat surface of the flat pull hood 50. . Accordingly, the position of the person's elbow is 10 mm to 20 mm lower than on the work plate 60 where the actual work is performed, and the work is harder to that extent. In addition, harmful gases during actual work are generated from the work plate 60 located 10 mm to 20 mm higher than the flat surface of the pull hood 50. Therefore, since this harmful gas is sucked together with the airflow from the suction surface arranged on the flat surface of the pull hood 50 which is 10 to 20 mm lower, there is a possibility that the harmful gas may pass through from the suction surface, and the harmful gas is discharged to the outside. There is a risk of spreading.

  Furthermore, when this push-pull ventilator is configured to have a blocking surface 56 at the center of the flat surface of the pull hood 50 and a suction surface 57 around it, the position where the work plate 60 is placed on the blocking surface 56 is If it is slightly displaced from the blocking surface 56 or is displaced during the work, the work plate 60 will block the suction surface 57, and the amount of air sucked from the suction surface 57 is reduced by that amount, and harmful gas is discharged to the outside. There is a risk that it will diffuse.

  Further, the push-pull ventilator of Non-Patent Document 1 has a completely open state between the pull hood 50A and the push hood 51A. Therefore, although the workability on the surface of the pull hood 50A is very good, the push hood Since the support of 51A uses the beam of the building or relies on a separately installed support column, simple installation is difficult. In addition, there is a demerit for the fully open state between the pull hood 50A and the push hood 51A, for example, it is necessary to increase the air volume of the push pull in order not to diffuse harmful gas to the outside, There are disadvantages such as weakness.

  Therefore, the present invention has been made in view of the above circumstances, has good workability, and can smoothly suck and discharge dust, harmful gas, and the like generated during work to the outside without diffusing. It is an object to provide a ventilator that can be installed and easily moved.

The present invention has been proposed in order to achieve the above-mentioned problems, and is characterized by having the following configuration.
That is, the invention according to claim 1 is an upper hood for supplying a laminar flow, and a lower portion which is located below the upper hood and has a surface recessed to provide a working space and a suction port provided on the recessed surface. A hood, an exhaust box placed on the upper hood, and a wall body interposed between the lower hood and the upper hood to support the lower hood, and the exhaust box and lower portion above the wall body A hood is connected by a duct along the wall surface body, and harmful gas drifting on the work space of the lower hood is led to the suction port as it is by a laminar flow hanging from the upper hood, and is sucked into the lower hood. A ventilating apparatus for ventilating outside from the exhaust box via the duct along the wall surface.

  In the invention according to claim 2, the surface of the lower hood is recessed so that the cross-sectional shape is an inverted trapezoid, the suction port is provided in the inclined portion of the periphery of the recessed portion, and the central flat portion is provided. It is a ventilator characterized by using the work space.

  The invention according to claim 3 is the ventilator characterized in that the depth of the recess of the lower hood is in the range of 10 mm to 20 mm.

  The invention according to claim 4 is the ventilator characterized in that the exhaust box has a built-in fan.

  The operation of the first problem solving means is as follows. That is, the surface where the laminar flow from the upper hood hangs down toward the work plate laid on the work space of the lower hood, and the harmful gas generated from the work on the work plate by the laminar flow is recessed as it is It leads to a suction port provided in the hood and sucks harmful gas into the lower hood from this suction port together with laminar flow. At that time, since the work space is recessed, even if a work board is laid on it, the height on the work board is lowered by the recessed part, making it easier to work with, and the recessed surface Hazardous gas is led into the lower hood without being allowed to pass through, and sent into the exhaust box from the lower hood through the duct along the wall surface, and is vented to the outside from the exhaust box.

  The operation of the second problem solving means is that the work plate is laid on the work space which is the flat surface at the center of the recess of the lower hood, so that the work plate is shifted from the work space of the flat surface and runs on the inclined portion. The work plate does not block the suction port provided in the inclined portion.

  The action of the third problem solving means is that the thickness of the working plate is in the range of 10 mm to 20 mm, so that the working space has a depth (D) in the range of 10 mm to 20 mm in the center of the recess of the lower hood. Even if the work board is laid, it becomes almost the same height, it becomes easy to work, and further, it guides without letting harmful gas pass through the suction port on the recessed surface and sucks it into the upper hood.

  The action of the fourth problem solving means is that a harmful gas is sucked into the lower hood together with a laminar flow by a fan built in the exhaust box, and further, from inside the lower hood through a duct along the wall surface body. It sends into the exhaust box and ventilates outside from this exhaust box.

As described above in detail, the present invention has the following effects.
The invention according to claim 1 has good workability, and dust and harmful gases generated during the work can be smoothly sucked in without being diffused and discharged to the outside, and can be easily installed and moved easily. There is an effect that can be done.

  In addition to the above-described effects, the invention described in claim 2 is more stable because the work plate is less likely to be displaced from the work space, has better workability, and the work plate does not block the suction port of the inclined portion. This has the effect of eliminating harmful gases.

  In addition to the above-described effects, the invention according to claim 3 has good workability even when a work plate is laid on the work space, and harmful gas does not pass through the suction port. There is an effect that can be done.

  In addition to the above-described effects, the invention described in claim 4 has the effect of reliably removing harmful gases to the outside even when the installed indoor ventilation facilities are insufficient.

It is a perspective view of a ventilator showing an embodiment of the invention. It is the side view which sectioned a part of ventilation device of the present invention. It is a rear view of the ventilation apparatus of this invention. It is a perspective view which shows a prior art example. It is a perspective view which shows a prior art example.

  1 to 3, the ventilator 1 includes an upper hood 3 that supplies a laminar flow 2, and a work space 4 that is located below the upper hood 3 and has a surface recessed to form a work space 4. It consists of a lower hood 6 provided with a suction port 5, an exhaust box 7 placed on the upper hood 3, and a wall body 8 that is interposed between the lower hood 6 and the upper hood 3 and supports the upper hood 3. The exhaust box 7 above the wall body 8 and the lower hood 6 are connected by a duct 9 along the wall body 8, and harmful gas drifts on the work space 4 of the lower hood 6 due to the laminar flow 2 hanging from the upper hood 3. Is directly introduced into the suction port 5, sucked into the lower hood 6, and ventilated from the exhaust box 7 to the outside via the duct 9 along the wall surface body 8.

  Since the upper hood 3 supplies the laminar flow 2, at least a laminar flow generation mechanism 10 is incorporated, and in addition, a blower 11 for blowing air to the laminar flow generation mechanism 10 is necessary. The blower 11 is not necessarily built in the upper hood 3. If there is an air source from which the necessary air volume and pressure can be obtained, an inlet 13 described later may be connected to the air source. The laminar flow generating mechanism 10 includes at least a corrugated punching plate 12 formed by corrugating a punching plate having a predetermined aperture ratio, a 100 ± 20 mesh netting material, and a lattice louver.

  In this embodiment, the upper hood 3 includes the laminar flow generation mechanism 10, the two blowers 11 disposed on the corrugated punching plate 12 side of the laminar flow generation mechanism 10, the blowers 11 and the laminar flow. The corrugated punching plate 12 includes a machine body 15 having a generating mechanism 10 and two air inlets 13 for receiving air from outside and an air outlet 15 including a plurality of small hole groups for sending out the generated laminar flow 2. The corrugated wall cushions the drift of the airflow from the blower 11, and the airflow is roughly uniformed by the resistance generated at the predetermined aperture ratio of the corrugated punching plate 12, and a higher quality layer is formed by the mesh material and the lattice louver. The laminar flow 2 is sent out from a large number of small holes at the outlet 14 as a flow.

  As the corrugated punching plate 12 of the laminar flow generating mechanism 10, a corrugated punching plate having a hole area ratio of 20% to 40% is used. In the corrugated punching plate 12 of this embodiment, the hole diameter of the small holes is 3 mm, and the pitch from the center of the small holes to each small hole is 5 mm (φ3 × p5). The aperture ratio of the plate 12 is 33%. In this embodiment, the corrugated punching plate 12 is folded into a sawtooth shape, and the corrugated punching plate 12 has a pitch of 20 mm. With this corrugated punching plate 12, the swirling air current drifting by the corrugated wall can be corrected, and the wind speed distribution can be roughly adjusted to be uniform by resistance when passing through countless small holes in the corrugated wall. It is.

  The mesh material is in the range of 100 ± 20 mesh, and is usually a stainless steel wire mesh, but may be made of other materials. This mesh material realizes a higher quality and uniform air flow. On the other hand, the lattice-like louver imparts a certain direction to the high-quality uniform air flow obtained from the mesh material.

  The airframe 15 has a rectangular parallelepiped shape as a whole, and as described above, there are two inflow ports 13 on the upper surface, two air blowers 11 are built in, and an air outlet 14 that is a group of small holes is provided on the lower surface. Then, the laminar flow 2 generated from now on is sent out.

  The lower hood 6 has a rectangular parallelepiped shape as a whole. In this embodiment, the surface of the lower hood 6 is recessed so that the cross-sectional shape is an inverted trapezoid, and a plurality of small hole groups are formed in the inclined portion 21 at the periphery of the recessed portion 20. The suction port 5 is provided, and the central plane portion is the work space 4. A connection port 22 for connecting to the exhaust box 7 above the wall surface body 8 via the duct 9 is provided on the wall surface body 8 side of the lower hood 6. Therefore, the harmful gas generated on the work space 4 by the suction port 5 of the inclined portion 21 is sucked into the lower hood 6 together with the laminar flow 2 suspended from the blower outlet 14, via the connection port 22 and the duct 9. It sends to the exhaust box 7 on the wall surface body 8, and ventilates outside.

  In the work space 4, it is customary to lay the work plate 23 when actually working. The work space 4 is a flat portion at the center of the hollow portion 20 of the lower hood 6 and is surrounded by the inclined portion 21, so that the work plate 23 is inclined with a deviation from the work space 4 that is the flat portion. Since it is difficult to get on the part 21 and it is difficult to work even if it gets on, the worker can make corrections immediately, and the suction port 5 provided in the inclined part 21 is not blocked by the work plate 23. . Accordingly, the surface of the lower hood 6 is recessed to form the recessed portion 20, the plane portion is used as the work space 4, and the suction port 5 is provided in the inclined portion 21. The work plate 23 does not block the suction port 5 of the inclined portion 21, and the harmful gas drifting on the work space 4 can be eliminated more stably.

  The depth of the work space 4 in the center of the recess 20 of the lower hood 6 is in the range of 10 mm to 20 mm. And since the thickness of the work board 23 laid on the work space 4 is also in the range of 10 mm to 20 mm, even if the work board 23 is laid on the work space 4, it becomes almost the same height, It is easy to work without lowering the position, and further, it is possible to guide the suction port 5 of the inclined portion 21 without letting harmful gas pass through and suck it into the lower hood 6, thereby eliminating harmful gas more reliably. it can.

  The exhaust box 7 has a rectangular parallelepiped shape as a whole, and is installed above the wall surface body 8 as described above. The exhaust box 7 incorporates an exhaust fan 30, has a connection port 31 for connection to the duct 9 below, and a discharge pipe 32 for connection to the exhaust duct on the upper surface thereof. Therefore, harmful gas generated on the work space 4 by the exhaust fan 30 is sucked into the lower hood 6 from the suction port 5 of the inclined portion 21 together with the laminar flow 2 suspended from the blower outlet 14, and the connection port 22, the duct 9. Further, the air can enter the exhaust box 7 above the wall surface 8 via the connection port 31 and can be ventilated to the outside by the exhaust duct connected to the discharge pipe 32. The exhaust fan 11 is not necessarily built in the exhaust box 7. If there is an air source that can obtain the necessary air volume and pressure from other sources, the exhaust pipe 32 may be connected to the air source. .

  The wall surface body 8 has a grooved steel shape, and as described above, is interposed between the lower hood 6 and the upper hood 3 to support the upper hood 3 and to be placed on the exhaust box 7. Is also supported. The wall surface 8 has the exposed duct 9 along the groove surface 8 a side, and the non-groove surface 8 b side is a wall surface between the upper hood 3 and the lower hood 6.

  The duct 9 is connected to the connection port 31 of the exhaust box 7 on the wall surface body 8 and the connection port 22 of the lower hood 6 along the wall surface body 8. The duct 9 contains harmful gas. As long as it has a cross-sectional area that can circulate air without any hindrance, rigidity to prevent deformation, and corrosion resistance against harmful gases, there are no particular limitations, such as metal pipes and ducts, resin pipes and ducts, rubber hoses, etc. It can be used.

Next, the operation state of the ventilator 1 having the above configuration will be described in detail.
First, when the power is turned on, the two blowers 11 of the upper hood 3 and the exhaust fan 30 of the exhaust box 7 are operated, and air enters from the two inlets 13, the corrugated punching plate 12 of the laminar flow generating mechanism 10, the mesh In the process of air passing through the material and the lattice louver, a laminar flow 2 having a uniform and high wind speed is formed. The laminar flow 2 is sent out from the outlet 14, and the harmful gas drifting from the work on the work plate 23 laid on the work space 4 is pushed downward by the laminar flow 2, and the inclined portion 21. And is sucked together with the laminar flow 2 and enters the lower hood 6, enters the exhaust box 7 above the wall surface body 8 through the duct 9 along the wall surface body 8, and discharges the pipe 32. The air can be vented to the outside by an exhaust duct connected to.

  As described above, the first embodiment of the present invention has been described, but the specific configuration is not limited to this, and modifications and additions within the scope not departing from the gist of the present invention, other combinations in each claim, It should be understood that this is possible as appropriate.

  The ventilator of the present invention has good workability, and dust and harmful gases generated during work can be smoothly sucked in without being diffused and discharged to the outside, and it is easy to install and move easily. In such a case, the availability becomes extremely high.

DESCRIPTION OF SYMBOLS 1 Ventilator 2 Laminar flow 3 Upper hood 4 Work space 5 Suction port 6 Lower hood 7 Exhaust box 8 Wall surface body 8a Groove surface 8b Non-groove surface 9 Duct 10 Laminar flow generation mechanism 11 Blower 12 Corrugated punching board 13 Inlet 14 Outlet DESCRIPTION OF SYMBOLS 15 Airframe 20 Indentation part 21 Inclination part 22, 31 Connection port 23, 60 Work board 30 Exhaust fan 32 Exhaust pipe 50, 50A Flat pull food 51, 51A Push hood 52 Suction mechanism 53 Support member 54 Front part 55 Side part 56 Blocking surface 57 Suction surface 58 Contaminated area 59 Clean area

It is a perspective view of a ventilator showing an embodiment of the invention. It is the side view which sectioned a part of ventilation device of the present invention. It is a rear view of the ventilation apparatus of this invention. It is a perspective view which shows a prior art example. It is a perspective view which shows a prior art example.

Claims (4)

  An upper hood for supplying a laminar flow, a lower hood located below the upper hood and having its surface recessed to form a working space and a suction port provided on the recessed surface, and the upper hood were placed on the upper hood A duct including an exhaust box, and a wall body interposed between the lower hood and the upper hood to support the upper hood, and the exhaust box above the wall body and the lower hood are arranged along the wall body The harmful gas drifting on the work space of the lower hood by the laminar flow hanging down from the upper hood is directly led to the suction port, sucked into the lower hood, and the duct along the wall surface is A ventilator for ventilating from the exhaust box via the outside.   2. The lower hood according to claim 1, wherein the surface of the lower hood is recessed so that the cross-sectional shape thereof is an inverted trapezoid, the suction port is provided in an inclined portion at the periphery of the recessed portion, and a central plane portion is the working space. Ventilation device.   The ventilator according to claim 1 or 2, wherein the depth of the recess of the lower hood is in the range of 10 mm to 20 mm.   The ventilation apparatus according to claim 1, 2, or 3, wherein the exhaust box has a built-in fan.

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