JP2009291741A - Working table with exhaust function and exhaust unit - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a working table with an exhaust function having a right and left laterally long suction dust, which is capable of conducting the exhaust from each portion of the working surface efficiently using the limited intake capabilities. <P>SOLUTION: A front plate 10 with many perforated apertures is arranged in the opening part of the suction duct 4. A right and left laterally long pressure loss member 21 to impart the resistance to air flow is arranged in the suction duct 4. The difference between the right and left suction force in the suction duct 4 becomes small because the resistance of the pressure loss member 21 to the air flow is larger as the pressure loss member 21 is nearer to the exhaust aperture 19. Resultingly, since the suction force at each right and left portion of the suction duct 4 is equalized, gas, smoke and the like are sucked and removed efficiently. A wall plate 8 is arranged on both right and left side edges of the working surface 2. The wall plate 8 contributes to the efficient removal of toxic gas and the like and does not disturb the work because the upper face inclines forward. <P>COPYRIGHT: (C)2010,JPO&amp;INPIT

Description

  The present invention relates to a work table with an exhaust function (sometimes referred to as an experimental table) and an exhaust unit suitable for use therewith.

  The work table with an exhaust function includes a top plate having a rectangular shape in plan view with an upper surface serving as a work surface, and a person stands in front of the top plate to perform work. Then, on the rear side of the work surface, a horizontal suction duct (intake chamber) that opens to the front facing the work surface is arranged, and toxic gas and smoke generated by work on the work surface are sucked into the suction duct. The exhaust pipe is excluded outside (for example, Patent Document 1).

The front surface of the suction duct is covered with a plate material having many holes and a ventilation material such as a mesh or a wire mesh. In addition, there are a single-sided specification in which the work surface extends only in front of the suction duct, and a double-sided specification (back-to-back type) in which the work surface (in other words, the top plate) extends on both sides before and after the suction duct. The air sucked into the suction duct may be discharged downward, right or left side, but in general, it is discharged upward, and an exhaust pipe is connected to the left and right middle part of the suction duct. Yes. In some cases, an air supply means for forcibly pushing toxic gas or smoke generated on the work surface toward the suction duct is provided at the front end of the top plate.
Utility Model Registration No. 2600246

  In a work table with an exhaust function, exhaust holes are formed in the left and right intermediate portions of the suction duct, and an exhaust pipe is connected to the exhaust holes. Therefore, the suction force inside the suction duct becomes weaker as the distance from the exhaust hole increases. That is, the suction force of the suction duct becomes weaker as it goes to the left and right ends thereof. Therefore, toxic gas and smoke generated near the left and right ends of the work surface (the top surface of the top plate) are sucked into the suction duct. It was feared that it would be dissipated indoors.

  Now, the capacity of a vacuum source such as an exhaust fan is determined in advance from the point of view of economy, etc. Therefore, it is necessary to efficiently suck and remove toxic gas, smoke, etc. under given conditions. The present invention has been made in view of such a current situation, and it is intended to provide a work table that can efficiently suck and remove toxic gases and the like from a wide range of work surfaces by efficiently using a predetermined suction force. It is.

  The work table according to the present invention has a working surface extending in front of a horizontally elongated suction duct that opens forward, and the suction duct is provided with an exhaust hole for exhausting air therein, A person works from the opposite side of the suction duct across the work surface.

  The invention of claim 1 is characterized in that, in the basic configuration, a breathable front plate is provided on an opening surface of the suction duct, and the air flows in the suction duct toward the exhaust hole. The pressure loss member that provides resistance is arranged so as to extend in the left-right direction. The pressure loss member means a pressure loss imparting member, and can also be referred to as an air flow suppressing member or a baffle member.

  Various materials, structures, and forms can be adopted for the pressure-damaging member. According to the invention of claim 2, the pressure-damaging member is a plate having no or almost no holes, a plate having many small holes, and a breathable nonwoven fabric. , And one or a plurality of types selected from the mesh material.

  According to a third aspect of the present invention, in the first or second aspect of the present invention, front and rear longitudinal wall plates whose height decreases toward the front are erected on the left and right side edges of the work surface. According to a fourth aspect of the present invention, as a preferred form of the third aspect, the wall plate is erected with a longitudinal longitudinal wall plate whose height decreases toward the front.

  The present invention also includes an exhaust unit, and the exhaust unit includes a left and right horizontally-oriented suction duct having an air suction opening on the front surface, and the exhaust duct is configured to discharge air inside the suction duct. An exhaust hole is provided, a breathable front member is provided on the opening surface of the suction duct, and the flow resistance to the air flowing from the opening toward the exhaust hole is provided inside the suction duct. The pressure loss member for applying the pressure is arranged so as to extend in the left-right direction.

  In addition, although it is described in claim 1 that “a person is working from the opposite side of the suction duct across the work surface”, this represents a normal use mode and is a rare case. However, it does not exclude that a person works by reaching out from the left or right outside of the work surface. In addition, the work table to which the present invention is directed suffices to have a table and a suction duct, and there is no limitation to the other configurations. Accordingly, not only a table system having legs but also a system incorporated in a building wall is included.

  In this type of work table, the air inside the suction duct is sucked into the exhaust hole, so that the flow velocity is highest at the location of the exhaust hole. However, in the present invention, since the pressure loss member is arranged in the suction duct so as to extend in the left-right direction, the flow resistance is given to the air flowing into the suction duct by the pressure loss member, but the air flow resistance is proportional to the flow velocity. Therefore, the flow resistance due to the pressure loss member increases as it approaches the exhaust hole, and as a result, the suction force by the suction duct is promoted to be leveled over the entire length.

  More precisely, in the present invention, the closer to the exhaust hole, the stronger the suction force, but the difference in suction force (or suction amount difference) between the location closest to the exhaust hole and the farthest location is much greater than in the past. As a result, the toxic gas and smoke can be efficiently sucked from the left and right end portions of the work surface to improve the cleaning performance.

  Although various members can be used as the pressure loss member, if a simple plate, perforated plate, non-woven fabric or netting material is used as in claim 2, it can be easily obtained as a commercial product with a simple structure. It is beneficial in terms of cost. The material of the plate is not limited and various materials such as metal and resin can be used, but examples of using a perforated metal plate include punching metal and lath plate, which also have strength. Therefore, application to the present invention can contribute to simplification of the structure.

  Now, in the work space above the work surface, the air moves in various ways depending on the movement of human hands and the movement of objects, and this complicated movement of air has occurred at the left and right ends of the work surface. Toxic gas and smoke may behave to escape to the left and right outside of the work surface. In addition, since the exhaust holes are provided in the left and right middle part of the suction duct, the suction force by the suction duct becomes weaker as it goes to the left and right ends, so toxic gas and smoke escape to the left and right outside of the work surface. The phenomenon that comes out becomes easy to occur.

  On the other hand, in the configuration of claim 3 of the present application, the wall plate prevents the toxic gas and smoke generated on the work surface from leaking to the left and right outside of the work surface, and the area where the suction action of the suction duct works is a wall. It is limited to the upper side of the work surface by the plate, so that the suction force is not wasted, and the suction force at the left and right ends of the suction duct can be increased by efficiently using the limited suction force as described above. Together, the three can prevent or significantly suppress the leakage of toxic gas and the like to the left and right outside of the work surface.

  And when a person works on the workbench, move his / her hand (arm) or tool to the work surface so that he / she moves the tool to the work surface and its left / right outer side, or protrudes his elbow to the left / right outer side of the work surface. In this case, the frequency of the person moving the instruments to the upper side of the work surface and the left and right outer sides increases as the portion is closer to the front portion of the work surface. In this invention, since the height of the wall plate is lowered toward the front, it is possible to prevent the wall plate from interfering with work while ensuring the air leakage function.

  The invention according to claim 5 relates to an exhaust unit. This exhaust unit has, as an actual distribution form, a specification incorporated in a work table and a specification that is sold independently. is there. And, in the latter independent specification, it is possible to replace it with the one attached to the existing work table, or to install it on a work table (table) that does not have an exhaust function and to provide an exhaust function, It is possible to respond precisely to user requests.

  Next, an embodiment of the present invention will be described with reference to the drawings. 1 to 5 show the first embodiment, and FIG. 6 and subsequent drawings show other embodiments. Hereinafter, the first embodiment will be described sequentially.

(1). Structure of the First Embodiment FIG. 1 is a perspective view of a work table according to the first embodiment. As shown in FIG. (Horizontal oblong) top plate 1, two front and rear legs 3 that support the top plate 2 on the left and right sides thereof, and a suction duct 4 that protrudes above the top plate 1 behind the work surface 2. ing. The suction duct 4 has a rectangular box-like appearance and has the same width as the top plate 1. Further, a joint pipe 5 is projected upward from the left and right intermediate portions of the upper surface of the suction duct 4, and a tubular exhaust pipe 6 or the like is connected to the joint pipe 5. The joint pipe 5 is provided with a flow rate adjusting knob 5a.

  In addition, as shown by a one-dot chain line in FIG. 1, a blow unit 7 that blows air from above the work surface 2 toward the suction duct 4 can be provided at a location in front of the work surface 2. Wall plates 8 that extend over substantially the entire depth of the work surface 2 are provided on the left and right side edges of the work surface 2. The rear end of the wall plate 8 has substantially the same height as the suction duct 4 and is formed in a triangular shape in a side view in which the height gradually decreases from the rear end toward the front end. The wall plate 8 is detachably fixed to the top plate 1 and the suction duct 4 via a bracket (not shown). The material of the wall plate 8 is not limited, but a resin plate such as an acrylic resin is preferable from the viewpoint of chemical resistance.

  The suction duct 4 is opened forward, and a front plate 10 having a large number of elongated holes 9 is disposed in the opening as an example of a breathable front member. FIG. 2 is a partial partially broken perspective view, FIG. 3 is a partial front view of the front plate 10, and the shape of the front plate 10 is clearly shown in FIG. The left and right intermediate portions (portions where the joint pipes 5 are provided) of the front plate 9 are non-venting portions 9a that do not have the group of the vertical holes 9, but the vertical holes 9 are also provided at locations corresponding to the joint pipes 5. It is possible.

  In FIG. 2, the group of the vertically long holes 9 in the front plate 10 is only partially displayed. FIGS. 3B and 3C show different front members. In the example shown in FIG. 3B, a large number of small holes 10b are formed. In the example shown in FIG. 3C, the opening is covered with a net member 10c such as a wire net.

  The left and right ends of the suction duct 4 are power supply units 11, and an outlet (not shown) is provided on the front surface of the power supply unit 11. As shown in FIG. 2, the power supply unit 11 is partitioned by left and right inner plates 12 of the suction duct 4. Needless to say, the power supply unit 11 does not have an intake function. The rear leg 3 is positioned in front of the suction duct 4, and a side plate 13 is disposed behind the rear leg 3.

  4A is a cross-sectional view taken along the line IVA-IVA in FIG. As clearly shown in FIG. 4A, the top plate 1 is composed of an upper plate 1a and a lower plate 1b made of metal plates, a resin surface plate 1c stretched on the upper surface of the upper plate 1a, and a reinforcement not shown. It has a frame. The upper plate 1 a and the lower plate 1 b extend to the rear end of the suction duct 4, and the upper plate 1 a constitutes the lower surface of the suction duct 4.

  The suction duct 4 has a top plate 15, a back plate 16, and a bottom plate 17 manufactured by bending a single metal plate, and is surrounded by the top plate 15, the back plate 16, the bottom plate 17, and the left and right inner plates 12. The space is an intake space 18. An exhaust hole 19 is formed in the left and right middle part of the upper surface plate 15, and the joint pipe 5 communicates therewith. A hollow gusset portion 15 a is bent at the front end portion of the upper surface plate 15. The front plate 10 is disposed at the base portion of the keratin portion 15 a and is screwed to an upper bracket 20 formed on the upper surface plate 15 of the suction duct 4 and a lower bracket 17 a formed on the bottom plate 17.

  A pressure loss member 21 is disposed inside the suction duct 4. The pressure loss member 21 extends to the left and right while being positioned below the exhaust hole 17. 4B is a development view of the pressure loss member 21 in the BB view of FIG. As can be clearly understood from FIG. 4B, the pressure loss member 21 of the present embodiment is made of a metal plate such as a steel plate or a stainless plate or a resin plate, and has no holes.

  More specifically, the pressure loss member 21 includes an inclined portion 21a that is forwardly inclined in a side view, an upper horizontal portion 21b that extends forward from the upper end of the inclined portion 21a, and a vertical portion 21c that extends downward from the lower end of the inclined portion 21b. The upper horizontal portion 21a and the lower vertical portion 21b are provided with attachment pieces 21d that overlap the inner plate 12 of the suction duct 4, and the attachment pieces 21d are screwed to the inner plate 12. The pressure loss member 21 may be fixed to the upper and lower inner surfaces of the suction duct 4.

  The upper horizontal portion 21a of the pressure loss member 21 is close to the upper bracket 20, and a passage 22 having a certain vertical distance is provided between the lower vertical portion 21b and the lower surface of the suction duct 4. As shown in FIG. 4C as another example, the pressure loss member 21 may be formed of a perforated plate having a large number of small holes. In this case, it is necessary to provide a passage 22 below the pressure loss member 21. Absent. The suction duct 4 itself is a unit and is fixed to the top plate 1 with screws or the like. That is, the suction duct 4 of the present invention is a detachable system, and therefore can be newly installed or replaced on an existing work table.

  As described above, when the fusible duct 7 is provided, as an example of the air feeding means, a horizontally long air feeding duct 23 can be disposed in a lower part of the suction duct 4 in the lower space of the top plate 1. . Two air supply ports 24 are provided on the lower surface of the air supply duct 23, and the air supply port 24 and the blast unit 7 are connected by one or a plurality of tubes 25. It is common for a work table to have a large number of work tables arranged side by side, and the air supply duct 23 of each work table is connected to each other so that pressurized air is sent from a common air supply means. ing. Of course, an air supply fan may be provided on each work table.

(2). Summary of First Embodiment FIG. 5A is a schematic diagram showing the flow of air, and FIG. 5B is a schematic diagram showing the suction force (flow velocity and flow rate) of air inside the suction duct 4. It is a typical graph. A thin line in (B) shows a comparative example when the pressure loss member 21 is not present. As shown in the graph of (B), the suction force inside the suction duct 4 decreases as the distance from the exhaust hole 19 increases regardless of the presence or absence of the pressure loss member 21, but the pressure loss member 21 does not exist (in the case of a thin line). Has a large difference in suction force, and the suction force is excessively strong in the portion close to the exhaust hole 19 and the limited ability is wasted. On the other hand, the suction force is very weak at the end of the suction duct 4. ing.

  On the other hand, in the present embodiment having the pressure loss member 21 (in the case of the thick line), the pressure loss member 21 acts as a resistance against the inflow of air throughout, but the closer to the exhaust hole 19, the higher the flow velocity and the greater the flow resistance. Therefore, the flow suppressing action by the pressure loss member 21 is larger as it is closer to the exhaust hole 19 and is smaller toward the left and right ends of the suction duct 4, so that the degree (gradient) in which the suction force decreases as the distance from the exhaust hole 19 decreases. As a result, the suction force at the left and right portions of the suction duct 4 is leveled as much as possible, and the intake efficiency of toxic gas or smoke can be improved.

  Now, when air is sucked into a horizontally long passage, the sucked portion needs to be held in a negative pressure state. In this regard, in the present embodiment, the space portion held in the negative pressure state is preferably formed in a state extending in the left-right direction.

  That is, the pressure loss member 21 of the present embodiment is made of a plate material that is not perforated, and the intake space 18 inside the suction duct 4 is partitioned into two front and rear spaces by the pressure loss member 21. In addition, a laterally long space is formed on the back side of the pressure loss member 21 and the passage 22 below the pressure loss member 21 is a narrow passage that is much smaller than the vertical width of the intake space 18. Is a plenum chamber that is maintained in a negative pressure state throughout, and for this reason, a strong suction force (negative pressure) is generated over the entire length of the left and right by the operation of the suction duct 4 at the location of the passage 22. As a result, the air flowing in from the front surface of the suction duct 4 can be accurately sucked into the passage 22 and discharged into the exhaust hole 19.

  More specifically, most of the air sucked into the suction duct 4 enters the suction duct 4 in a generally horizontal posture, and is then changed in direction so as to be wound under the pressure loss member 21 to the exhaust hole 18. Discharged. When the pressure loss member 21 is formed of a perforated plate, air passes through the pressure loss member 21. Also in this case, since the air flow resistance increases as the distance between the left and right sides increases, the suction force on the back side of the pressure loss member 21 is leveled at each part in the left and right direction.

  By the way, if the wall plate 8 is not present, air from the left and right outer sides of the work surface 2 also flows into the left and right end portions of the suction duct 4, so that there is a possibility that the limited suction force may be wasted. In the present invention, since the wall plates 8 are present at the left and right side edges of the work surface 2, the inflow of air from the left and right outer sides of the work surface 2 is prevented, and the limited suction capability can be used efficiently. Further, since the height of the wall plate 8 decreases toward the front, the wall plate 8 is not or hardly obstructed when a person moves the equipment or hands to work. Sex is not impaired. Although it is preferred to provide both the pressure loss member 21 and the wall plate 8, the wall plate 8 has its own independent advantages.

  As shown by a one-dot chain line in FIG. 5, for example, by arranging an auxiliary plate 27 whose distance from the back plate 16 increases toward the left and right ends inside the suction duct 4, the cross-sectional area of the intake space 18 is increased. The distance from the exhaust hole 19 can be reduced, and this configuration is more preferable because the flow velocity of air in each part of the intake space 18 can be leveled as much as possible. It is also possible to replace the back plate 16 with the auxiliary plate 27. The exhaust hole 19 may be provided on the back surface, the bottom surface, the left or right side of the intake duct 4, or both side surfaces.

(3). Other embodiments (FIGS. 6 to 8)
FIG. 6 shows a second embodiment. This first embodiment is applied to a double-sided specification type in which two working surfaces 2 are provided on both front and rear sides of one suction duct 4, and two pressure-loss members 21 are arranged back-to-back inside the suction duct 4. Has been. The pressure loss member 21 is formed in a square shape having a slope portion 21a and a lower vertical portion 21c. The shape of the pressure loss member 21 can be arbitrarily set as necessary.

  For example, as shown by a one-dot chain line in FIG. 6, it is formed in a flat plate and arranged in an inclined posture, or as shown by a two-dot chain line in FIG. 6, it is formed in an outward concave arc shape. Can do. In the present embodiment, the rear portion of the upper surface of the wall plate 8 is a horizontal portion.

  The third embodiment shown in FIG. 7A is applied to a double-sided specification type work table as in the second embodiment, and the pressure loss member 21 includes front and rear vertical portions 21e and a bottom portion 21f connecting the vertical portions 21e. It has the shape of an upward opening having a U-shape. A large number of small holes are formed in the vertical portion 21e. Since the bottom portion 21f does not contribute to ventilation, a group of small holes is not necessary. However, when a commercially available punching metal or a lath plate is used, small holes will also be formed in the bottom portion 21f.

  The fourth embodiment shown in FIG. 7B is a modification of the third embodiment, and a ventilation space is provided between the bottom plate 21 f of the pressure-damage member 21 and the bottom plate 17 of the suction duct 4. The bottom plate 21f of the pressure loss member 21 is also air permeable. Further, the front plate 10 is formed by bending on the bottom plate 17 of the suction duct 4, and a number of holes are formed in this.

  In the fifth embodiment shown in FIG. 8, a nonwoven fabric is used as the pressure loss member 21. Since the non-woven fabric has a low form-retaining property, a reinforcing material 28 made of a wire mesh is used to maintain the shape. Instead of the non-woven fabric, it is also possible to use a net material (net material), a cotton-like material, or the like. There are no particular limitations on these materials.

(4). Others The present invention can be embodied in various ways other than the above embodiment. For example, exhaust holes can be provided at a plurality of left and right locations of one suction duct. As disclosed in Patent Document 1, it is also possible to incorporate a suction duct into the shelf device. In the case of a double-sided working table, it is possible to open and close the front and rear front plates as in Patent Document 1. The material, shape, arrangement posture, arrangement position, and the like of the pressure loss member can be arbitrarily set. It is also possible to arrange a plurality of pressure-loss members intermittently in the left-right direction.

  When the front plate is a perforated plate method, it can be arbitrarily set to the shape and arrangement of the holes. It is also possible to configure the front plate with a wire mesh or a mesh material. In the wall plate of the first embodiment, the inclined upper surface and the horizontal lower surface are connected to form a front end or an acute angle, but the front end surface may be formed as a vertical portion having a slight height. The rear part of the upper surface may be inclined to the rear end or may be horizontal as shown in FIG.

It is a perspective view of the work table concerning a 1st embodiment. It is a partial partially broken isolation perspective view of a 1st embodiment. It is a partial front view of a front board. (A) is the IVA-IVA sectional view of FIG. 1, (B) is the expanded view which looked at the pressure-loss member from the BB direction of (A). (A) is the schematic diagram which shows the flow of air, (B) is the typical graph which showed the relationship between the left-right position in the inside of a suction duct, and suction power. It is a figure which shows 2nd Embodiment. It is a figure which shows 3rd Embodiment and 4th Embodiment. It is a figure which shows 5th Embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Top plate 2 Work surface 4 Suction duct 6 Exhaust pipe 8 Wall plate 10 Front plate 17 Suction duct suction space 18 Suction duct exhaust hole 21 Pressure loss member (baffle plate)

Claims (5)

A work surface extends in front of a horizontally-oriented suction duct that opens to the left and right, and the suction duct is provided with an exhaust hole for exhausting air inside the suction duct. In the configuration where people work from the opposite side,
A breathable front member is provided on the opening surface of the suction duct, and a pressure loss member that imparts flow resistance to the air flowing toward the exhaust hole extends in the left-right direction inside the suction duct. Being
Worktable with exhaust function. The pressure loss member is composed of one or a plurality of types selected from a plate having no or almost no holes, a plate having a large number of small holes, a breathable nonwoven fabric, and a mesh material.
The worktable with an exhaust function according to claim 1. Wall plates that divide the inside and outside of the work surface are erected on the left and right side edges of the work surface,
The worktable with an exhaust function according to claim 1 or 2. The wall plate is erected with a longitudinal wall plate whose height decreases as it goes toward the front,
The worktable with an exhaust function according to claim 3. It has a left and right horizontally-oriented suction duct with an air suction opening on the front surface, and the suction duct is provided with an exhaust hole for discharging the air therein, and the opening surface of the suction duct Is provided with a breathable front member, and a pressure loss member for imparting flow resistance to the air flowing from the opening toward the exhaust hole extends in the left-right direction inside the suction duct. Yes,
Exhaust unit.

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