JP5207563B1 - Work table with air curtain - Google Patents

Abstract

PROBLEM TO BE SOLVED: There is no fear that an air flow constituting an air curtain hits a sample or the like placed on a work table surface and is dried, and an air flow is disturbed by an operator's arm or the like and the function of the air curtain is impaired. A work table with an air curtain excellent in workability and shielding performance is provided.
SOLUTION: A push-side chamber 5 and a pull-side chamber 6 are provided on both sides of the table surface 4A in the longitudinal direction, respectively, and an air flow is blown out from an outlet of the push-side chamber 5 toward an inlet of the pull-side chamber 6, A sample placed on the table surface 4A by generating an air curtain with a horizontal air flow above the table surface 4A and sucking air from the fine ventilation holes h distributed over substantially the entire surface of the table surface 4A. The air curtain hits the air curtain to prevent it from drying, and the leakage and diffusion of harmful substances into the room is prevented.
[Selection] Figure 1

Description

  The present invention is an air curtain for preventing substances harmful to the human body, such as formalin mist, from flowing out and diffusing into a room when preparing a sample for microscopic observation of a specimen in a dissection room or a pathology laboratory. It is related with work table with.

  Conventionally, in order to prevent an operator from being exposed to harmful substances when handling a source of harmful substances on a table, for example, a desktop ventilation using a push-pull airflow as described in Patent Document 1 A device has been proposed.

  In the apparatus, a work table surface is constituted by a suction surface of a flat pull hood, and an air flow blown from the work hood to a table surface from a push hood provided facing the upper side of the work table surface. It is configured to be inhaled.

Japanese Patent No. 4551984

  When preparing a sample for microscopic observation of a tissue such as a specimen in a dissection room or a pathology laboratory, it is necessary to slice the tissue very thinly. Such an operation is described in Patent Document 1 described above. However, there is a problem that a sample prepared by slicing thinly placed on the work table is dried by an air flow blown down from above on the work table surface.

  In addition, since the operator's arm etc. is intruded on the work table surface, the airflow blown down from above is disturbed by hitting the operator's arm etc., or created on the work table surface or above it Because it bounces off the sample, the air curtain function is not fully demonstrated, and harmful substances such as formalin mist that diverges from the specimen tissue leaks outside the work table surface and diffuses into the room, causing the health of workers, etc. There was also a risk of adverse effects on the environment.

  Therefore, the present invention solves the problems in the prior art as described above, there is no possibility that the air flow constituting the air curtain hits a sample or the like placed on the work table surface, and the operator's arm or the like. It is an object of the present invention to provide a work table with an air curtain that is excellent in workability and shielding properties, in which the air flow is not disturbed and the function of the air curtain is not impaired.

For the above purpose, the work table with an air curtain of the present invention has a table main body having a horizontal table surface having a top surface of a rectangular perforated plate in which fine ventilation holes are dispersed on substantially the entire surface,
A push-side chamber provided at one end portion in the longitudinal direction of the table surface and a pull-side chamber provided at the other end portion in the longitudinal direction of the table surface.

  A space defined by a side wall inner surface, a bottom plate upper surface, and a perforated plate lower surface is formed in the table body, and a first exhaust port communicating with an air purifying device opens upward on the bottom plate upper surface, The first exhaust port has a porous cylindrical member that surrounds the first exhaust port substantially concentrically and allows air to pass horizontally from the inside of the space in the radial direction over the entire circumference to be introduced into the first exhaust port. One straightening member is mounted.

  The push-side chamber has an intake port communicating with the blower, and is opposed to the pull-side chamber and is spaced apart from the table surface by a predetermined distance above the width of the table surface. A rectangular blower outlet that is flat in the vertical direction is opened, and a rectifying duct formed by concentrating a number of fine flow paths in the same direction is formed inside, and the outlet ends of these flow paths are located behind the blow outlets. Arranged substantially horizontally so as to be adjacent to each other, between the intake port and the inlet end of each flow path of the rectifying duct, the flow of air introduced from the intake port into each flow path of the rectifying duct A second rectifying member is provided for uniform introduction.

  The pull-side chamber has a rectangular suction port that faces the air outlet of the push-side chamber and is flat in the vertical direction with a width substantially equal to the width of the table surface, and communicates with the air purification device. A third rectifying member is provided between the suction port and the second exhaust port for taking in air with a uniform flow velocity in the width direction from the suction port. ing

  In the work table with an air curtain of the present invention, a plurality of the first exhaust ports are provided, and the first exhaust port and the second exhaust port are aired through flow rate adjustment dampers that can be individually adjusted. It is desirable to be configured to communicate with the purification device.

  Moreover, in the work table with an air curtain of the present invention, it is also desirable that the height of the air outlet from the table surface is adjustable.

  Further, in the work table with an air curtain according to the present invention, the rectifying duct is supported near the outlet end facing the air outlet so as to be tiltable about a horizontal axis perpendicular to the longitudinal direction of the table surface with respect to the push side chamber. It is also desirable that the air blowing angle is adjustable.

  Furthermore, in the work table with an air curtain of the present invention, the table surface is horizontally covered at a position higher than the air outlet by a distance that does not disturb the air flow from at least the air outlet of the push side chamber to the air inlet of the pull side chamber. It is also desirable that a transparent cover member is provided.

  According to the work table with an air curtain according to the first aspect of the present invention, the air flow forming the air curtain is arranged such that the air flow forming the air curtain is located at a position away from the table surface by a predetermined distance from the push side chamber toward the pull side chamber. Since the liquid flows substantially horizontally in the longitudinal direction of the surface, there is no possibility that the air current of the air curtain hits a microscopic sample or the like prepared by thinly slicing the specimen tissue on the table surface and is dried.

  In addition, since the operator can work on the table surface by inserting his arms and hands from the side under the horizontally flowing air flow forming the air curtain, the air flow hits the arms and hands and is disturbed. There is no possibility that the shielding property of the air curtain is impaired.

  In addition, air is sucked from the table surface near both ends in the width direction of the table surface, which is not shielded by the air flow of the air curtain, so harmful substances such as formalin mist escape from both sides of the table surface and enter the room. Even if air intake from the table surface is partially blocked by a tray or the like placed on the table surface, the table surface is not affected by the air flow of the air curtain formed horizontally above the table surface. Since harmful substances emitted upward are immediately captured, it is possible to reliably prevent harmful substances from flowing into the room.

  As a result, the operator can place a container such as a tray or a petri dish at a desired location on the table surface when performing a cutting operation of the microscope sample from the specimen tissue. Hazardous substances such as formalin mist emanating from the surface of the prepared sample when opening the lid of the untreated container. The work on the table surface can be efficiently performed without diffusing the air containing the air in the room.

  According to the work table with an air curtain according to the invention described in claim 2, since the strength of the intake air from the table surface can be adjusted for each location, and the amount of air sucked from the suction port can be adjusted, It is possible to efficiently prevent leakage of harmful substances to the outside.

  According to the work table with an air curtain according to the invention described in claim 3, the height of the air flow of the air curtain can be adjusted to an appropriate position in accordance with the sitting height and height of each worker.

  According to the work table with an air curtain according to the invention described in claim 4, in the case where the airflow of the air curtain is deflected downward under the influence of the air such as indoor air conditioning from above the table surface, The angle of the air flow blown out from the outlet can be corrected.

According to the work table with an air curtain according to the fifth aspect of the invention, the cover member can prevent dust and the like from falling from the indoor ceiling or the like onto the table surface.
Further, the cover member can prevent the air curtain airflow from being disturbed by the airflow generated in the room by air conditioning or the like, and can prevent the air curtain airflow mixed with harmful substances such as formalin mist from moving upward. Therefore, the diffusion of harmful substances into the room can be more reliably prevented.

It is a perspective view showing one embodiment of a work table with an air curtain concerning the present invention. It is a top view which shows one Embodiment of the work table with an air curtain which concerns on this invention. It is a longitudinal section showing one embodiment of a work table with an air curtain concerning the present invention. It is AA sectional drawing of FIG. It is BB sectional drawing of FIG. It is a disassembled perspective view of the rectification | straightening duct in one Embodiment of the work table with an air curtain which concerns on this invention. It is a figure which shows the angle adjustment mechanism of the rectification | straightening duct in one Embodiment of the work table with an air curtain which concerns on this invention. It is a fragmentary longitudinal cross-sectional view of the blower outlet part of the push side chamber in one Embodiment of the work table with an air curtain which concerns on this invention. It is a figure which shows the guide shoe attachment structure to the movable chamber in one Embodiment of the work table with an air curtain which concerns on this invention. It is CC sectional drawing of FIG. It is a figure which shows the principal part structure of the height adjustment mechanism of the push side chamber in one Embodiment of the work table with an air curtain which concerns on this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the drawings. FIG. 1 is a perspective view showing an embodiment of a work table with an air curtain according to the present invention, and FIG. 2 is a plan view thereof. As shown in these drawings, a work table with an air curtain (hereinafter simply referred to as a work table). 1) has a table body 3 supported on a gantry 2 that can move on the floor surface with wheels 2A.

  The table main body 3 is provided with a rectangular perforated plate 4 in which fine ventilation holes h are dispersed on substantially the entire surface, and the upper surface of the perforated plate 4 forms a horizontal table surface 4A. As will be described later, the air on the upper surface is sucked downward from the table surface 4A through a vent hole h. In the present embodiment, the perforated plate 4 is a punched stainless steel plate.

  A push-side chamber 5 is provided at one end of the table surface 4A in the longitudinal direction, and a pull-side chamber 6 is provided at the other end. The push side chamber 5 blows out an air flow with the upper side of the table surface 4 </ b> A directed toward the pull side chamber 6, and the pull side chamber 6 sucks the air flow blown out from the push side chamber 5. The detailed structure of the push side chamber 5 and the pull side chamber 6 will be described later.

  FIG. 3 is a longitudinal sectional view of the work table 1. As shown in FIG. 3, the table main body 3 is divided below the porous plate 4 by the side wall 3A inner surface, the bottom plate 3B upper surface, and the lower surface of the porous plate 4. Space R. The bottom plate 3B is provided with first exhaust ports 7 at three locations in the longitudinal direction.

  Each of these exhaust ports 7 is constituted by an upper end opening portion of a short tube 8 provided so as to penetrate the bottom plate 3B. Moreover, the upper ends of these short tubes 8 partially protrude into the space R, and first rectifying members 9 are attached around the upper ends of the short tubes 8, respectively.

  These straightening members 9 are composed of a cylindrical member 9A concentrically surrounding the upper end portion of the short tube 8 and a disc-shaped shielding plate 9B closing the upper end surface of the cylindrical member 9A. In the present embodiment, the cylindrical member 9A uses a porous stainless steel plate formed in a cylindrical shape.

  The shielding plate 9B is also formed of a stainless steel plate, and is concentrically fixed to the upper end of the cylindrical member 9A. No air holes are formed in the shielding plate 9B, and foreign matter and liquid that have fallen from the table surface 4A through the air holes h of the perforated plate 4 are prevented from entering the short tube 8.

  The cylindrical member 9A has a height dimension such that the position of the shielding plate 9B is higher than the protruding height of the short tube 8 from the top surface of the bottom plate 3B, and a predetermined gap is provided between the bottom surface of the porous plate 4 and the bottom surface 3B. It is set to be formed. Further, the cylindrical member 9A and the shielding plate 9B can be integrally formed to be a single component.

  On the other hand, slide dampers 10 capable of individually adjusting the flow rate of the air passing therethrough are incorporated in the middle positions of the respective short pipes 8 projecting downward from the bottom plate 3B of the table main body 3. The lower ends of the pipes 8 are respectively connected to the junction pipes 11 supported horizontally in the longitudinal direction of the table surface 4A in the gantry 2.

  The junction pipe 11 is closed at the end close to the push-side chamber 5, and the opposite end is connected to a junction chamber 12 attached to the outside of the gantry 2 below the pull-side chamber 6. ing.

Next, the detailed structure of the push side chamber 5 will be described.
In the present embodiment, as shown in FIGS. 4 and 5, the push-side chamber 5 is attached to the table body 3, and a box-shaped movable chamber is installed in a box-shaped fixed chamber 5 </ b> A having an open upper end. It has a nested structure in which the lower part of 5B is inserted so as to be movable up and down.

The movable chamber 5B has a pair of left and right air inlets 13 at the bottom. One end of the telescopic hose 14 is connected to each of the air inlets 13.
The other ends of these telescopic hoses 14 pass through a pair of hose through holes 15 opened at the bottom of the fixed chamber 5A, respectively, from below the fixed chamber 5, as shown in FIG. Are drawn into a pair of hose through-holes 16 formed in the end wall and connected to a distribution chamber 17 in the gantry 2.

  The distribution chamber 17 is connected to a blower 18 as a blower installed inside the gantry 2 and plays a role of evenly distributing the air blown from the blower 18 to the respective expansion / contraction hoses 14.

  As shown in FIG.4 and FIG.5, the 2nd rectification | straightening member 19 is arrange | positioned above each inlet port 13 provided in the movable chamber 5B. The rectifying member 19 is provided in order to uniformize the velocity distribution of the air flow passing through here upward.

  As shown in FIG. 4, the movable chamber 5B is opposed to the pull-side chamber 6 and at a position spaced apart from the table surface 4A by a predetermined distance and having a width substantially equal to the table surface 4A and flat in the vertical direction. A shaped outlet 20 is opened.

  In the present embodiment, the air outlet 20 is located in the vicinity of the upper end of the movable chamber 5B, and a rectifying duct 21 is provided inside thereof. As shown in FIG. 6, the rectifying duct 21 is housed and held in a tilting frame 22 having a rectangular shape whose both ends in the longitudinal direction are open and whose cross section is flattened up and down.

  The rectifying duct 21 has a structure in which a large number of fine flow paths are converged in the same direction. In this embodiment, an integrally molded resin is used. The shape of the flow path 21A may be a round hole shape or a honeycomb shape in addition to the square hole shape as shown in FIG.

  Further, the rectifying duct 21 is not limited to the one integrally formed as in the present embodiment. For example, a number of straw-like resin tubes and glass thin tubes are bundled into a rectangular parallelepiped shape as shown in FIG. You may use what was comprised.

  The tilting frame 22 holding the rectifying duct 21 is tilted around the horizontal axis perpendicular to the longitudinal direction of the table surface 4A with respect to the movable chamber 5B, with the lower portion near the opening end facing the air outlet 20 of the movable chamber 5B. Supported as possible.

  That is, the tilting frame 22 is configured so that the ear shafts 22B projecting to the left and right sides from a pair of brackets 22A provided at the lower portions on both the left and right sides of the opening facing the air outlet 20 are arranged on both sides of the movable chamber 5B as shown in FIG. The free end side of the tilting frame 22 can be displaced in the vertical direction around a horizontal axis passing through between the left and right ear shafts 22B.

  As shown in FIG. 7, the bottom face of the free end side of the tilting frame 22 is supported on a pair of eccentric cams 24 in the vicinity of both left and right ends. These eccentric cams 24 are fixed to the angle adjusting shaft 25 supported so as to be rotatable around a horizontal axis perpendicular to the longitudinal direction of the table surface 4A with the direction of the respective cam surfaces being fixed with a screw 24A. ing.

  The angle adjusting shaft 25 is supported so as to be rotatable and slidable in the axial direction by bearing bushes 26 and 27 fixed to the left and right side walls of the movable chamber 5B in the vicinity of both ends.

  These bearing bushes 26 and 27 are respectively attached by fitting the boss portions 26A and 27A into holes provided on the left and right side walls of the movable chamber 5B, and one of the boss portions 26A is attached to the movable chamber 5B. A flat friction ring 28 made of a high friction rubber material is mounted on the outer periphery of the protruding portion so as to protrude outside one side wall.

  An angle adjustment knob 29 is fixed to the shaft end portion of the angle adjustment shaft 25 protruding outward from the bearing bush 26. The angle adjustment knob 29 is formed of an annular flat surface 29A whose surface facing the friction ring 28 has a slightly larger inner diameter than the boss portion 26A and whose outer diameter is substantially equal to the outer diameter of the friction ring 28.

  On the other hand, on the angle adjusting shaft 25 between the eccentric cam 24 adjacent to the bearing bush 26 and the bearing bush 26, together with the spring washer 30, a compression coil spring 31 is incorporated in a compressed and deformed state. In addition, the compression coil spring 31 constantly urges the annular flat surface 29A of the angle adjustment knob 29 to press the friction ring 28 against the outer wall surface of the movable chamber 5B.

  As a result, in this state, the angle adjustment shaft 25 has the friction ring 28 pressed from both sides of the outer wall surface of the movable chamber 5B and the flat surface 29 of the angle adjustment knob 29. The rotation of the adjustment shaft 25 is stopped.

  On the other hand, when the angle adjustment knob 29 is pulled against the urging force of the compression coil spring 31 to release the pressing of the friction ring 28 by the flat surface 29A, the angle adjustment shaft 25 can freely rotate.

  In this state, when the angle adjustment shaft 25 is rotated by a desired angle, the pair of eccentric cams 24 is rotated accordingly, and the inclination angle of the tilting frame 22 and the rectifying duct 21 held by the tilting frame 22 is adjusted. be able to.

  In the embodiment, the adjustable angle range is such that the free end side is inclined slightly downward from the horizontal orientation of the rectifying duct 21 (shown by a solid line in FIG. 4 and a virtual line in FIG. 8). Are set between the postures (indicated by solid lines in FIG. 8 and imaginary lines in FIG. 4). The angle range may be extended to a posture in which the free end side is inclined slightly upward.

  As shown in FIG. 8, the peripheral part of the blower outlet 20 formed in the movable chamber 5B is bent inward at a right angle to form a rectangular frame-shaped seal holding part 32, and the seal holding part A rectangular seal member 32 </ b> A shown in FIG. 6 is fitted and held in 32.

  On the other hand, on the outer periphery of the opening 20 side opening of the tilting frame 22, a bowl-shaped seal abutting portion 22C that abuts on the inner end surface of the seal member 32A is provided. In the range in which the tilt frame 22 can tilt, the seal member 32A is elastically deformed following the tilt frame 22 with the seal member 32A being sandwiched between the inner peripheral edge of the outlet 20 and the seal contact portion 22C. The gap between the periphery of the air outlet 20 and the rectifying duct 21 is always closed by the sealing member 32A.

  Since the material of the sealing member 32A is excellent in flexibility and elasticity, a foamed polyurethane resin is used in the present embodiment, but the sealing member 32A is not limited to this. In addition, any material that can be greatly elastically deformed is acceptable.

  Next, the vertical movement guide mechanism of the movable chamber 5B will be described. As shown in FIG. 1, guide rails 33 each having an L-shaped cross section are vertically provided at four corners of the push-side chamber 5. The lower portions of these guide rails 33 are fixed to the outer corners of the fixed chamber 5A, and the upper ends are fixed to the four corners of the rectangular top plate 34 provided above the movable chamber 5B. .

  On the other hand, resin-made L-shaped guide shoes 35 are fixed to the outer four corners of the upper end portion of the movable chamber 5B, as shown in FIG. The inner surface of 33 is slidably guided and supported.

  Accordingly, as described above, the movable chamber 5B is inserted into the fixed chamber 5A in a nested manner at the lower portion, and the outer four corners of the upper end can be slid by the four guide rails 33 via the guide shoes 35. Therefore, it is possible to smoothly move up and down.

  As described above, the height of the movable chamber 5B supported is adjusted by rotating the height adjustment knob 36 provided in the fixed chamber 5A. That is, as shown in FIG. 5, the height adjustment knob 36 has a horizontal height that is rotatably supported through a pair of bearings 37 that are respectively attached to the inside of the left and right side walls of the fixed chamber 5A. It is fixed to one end of the adjustment shaft 38.

  As shown in FIG. 11, worms 39 are provided in the vicinity of both ends of the height adjusting shaft 38, and the pair of worms 39 mesh with worm gears 41 provided on the vertical screw shaft 40, respectively. .

  These screw shafts 40 are rotatably supported by bearings (not shown) held at bearing holders 42 whose lower ends are respectively fixed to the left and right side surfaces outside the fixed chamber 5A.

  In the present embodiment, a deep groove ball bearing is used as a bearing incorporated in the bearing holder 42, but a thrust bearing may be used in combination when the weight of the movable chamber 5B is large.

  Further, male screws 40A are formed in a range of a predetermined length from the upper ends of these screw shafts 40, and these male screws 40A are fixed to the left and right side surfaces on the outer side of the movable chamber 5B, respectively. Is screwed into a screw hole formed through.

  With such a configuration, when the height adjustment shaft 38 is rotated by the height adjustment knob 36, the pair of screw shafts 40 is connected via the pair of worms 39 provided on the height adjustment shaft 38 and the worm gear 41 engaged therewith. As a result, the height of the movable chamber 5B can be adjusted to a desired position via the pair of nut brackets 43 screwed into the respective male screws 40A.

Next, the detailed structure of the pull side chamber 6 will be described.
In the present embodiment, the pull side chamber 6 is formed in a box shape, and faces the air outlet 20 of the push side chamber 5 above the side surface on the table surface 4A side so as to face the table 4A surface. It has a rectangular suction port 44 which is substantially equal to the width of the flat and is flat in the vertical direction.

  The suction port 44 is provided with a perforated or mesh-like net plate 45 so as to prevent foreign matter from being sucked and the air suction amount to be uniform throughout the suction port 44. In addition, since the vertical width of the suction port 44 is made to correspond to the vertical height adjustment width of the air outlet 20 (see FIG. 4), in this embodiment, it is set larger than the vertical width of the air outlet 20. ing.

  As shown in FIG. 3, a second exhaust port 46 is provided at the bottom of the pull side chamber 6, and a third rectifying member 47 is provided between the exhaust port 46 and the suction port 44. Has been placed. The rectifying member 47 cooperates with the mesh plate 45 to play a role in averaging the speed of the air flow sucked from the suction port 44.

  The exhaust port 46 is connected to the merging chamber 12 via a slide damper 48 and a short pipe 49. The slide damper 48 is the same as the slide damper 10 described above.

  The joining chamber 12 joins the short pipe 49 and the joining pipe 11 described above inside and communicates with the exhaust hose 50 connected to the joining chamber 12. The exhaust hose 50 is connected to an air purification device (not shown) that is separately provided outside the work table 1.

  Moreover, as shown in FIG. 1, the work table 1 of the present embodiment includes a roll screen 51 made of a transparent resin film as a cover member that can cover the upper surface of the table surface 4A as necessary. Yes.

  Both ends of the roll screen 51 are moved forward from the reel portion 51A attached to the push-side chamber 5 and the pull-side chamber 6 against the urging force of a spring (not shown) built in the reel portion 51A. Both ends of the pulling shaft 51B fixed to the pulling side edge are engaged with a pair of screen guides 51C attached to the top surfaces of the top plate 34 and the pull side chamber 6, respectively. The guide is supported so as to be slidable.

  The top surface of the top plate 34 provided on the push side chamber 5 and the top surface of the pull side chamber 6 are provided at the same level so that the pair of screen guides 51C are located in the same horizontal plane. Yes.

  Although not shown in the figure, inside the screen guides 51C, along the longitudinal direction, there are provided engaging step portions that are respectively engaged with both ends of the shaft 51B at predetermined intervals. The pull-out length of the roll screen 51 can be selected stepwise by hooking the shaft 51 toward the desired engagement step while pulling the shaft 51 forward.

  On the other hand, when the roll screen 51 is pulled into the reel portion 51A, if the shaft 51 is pulled slightly forward and removed from the engaging step portion, the roll screen 51 is pulled by the restoring force of the mainspring spring built in the reel portion 51. The reel unit 51 is configured to be wound up.

  Next, when the work table 1 configured as described above is used to create a microscopic sample such as a specimen, the operator performs the width direction of the table surface 4A of the work table 1 shown in FIG. Stand on the front side or sit on a chair and slice the tissue such as the sample thinly.

  At this time, the table surface 4A is rectangular, and space can be secured on both the left and right sides of the operator on both sides in the longitudinal direction. For example, the table surface 4A has an unprocessed surface on the left side of the operator. Place the petri dish S containing the specimen tissue piece, place the tray T in the center, slice the tissue piece on it to create a microscope sample, and place the petri dish S containing the prepared microscope sample on the right side. Work efficiently.

  When performing the above work, the exhaust hose 50 is connected to the work table 1 and an air purification device (not shown) to operate the air purification device and to operate the blower 18 in the gantry 2 shown in FIG.

  Then, the air discharged from the blower 18 is evenly distributed to the pair of telescopic hoses 14 by the distribution chamber 17 and introduced into the movable chamber 5B of the push side chamber 5. When the air introduced into the movable chamber 5B passes through the second rectifying member 19, the flow velocity distribution of the air flow is averaged over the entire cross section, and then the air flows from the inlet end of the rectifying duct 21. Flows into the interior.

  Since the rectifying duct 21 has a structure in which a large number of fine and narrow flow paths are converged in the same direction, the air passing through the rectifying duct 21 becomes a parallel flow having a substantially uniform flow velocity over the entire cross section until reaching the outlet end. Then, the air is blown out from the blowout port 20 of the movable chamber 5B toward the suction port 44 of the pull side chamber 6 facing this.

  On the other hand, since the air in the pull side chamber 6 is sucked out to the external air purification device via the exhaust hose 50, the air flow from the outlet 20 to the vicinity of the inlet 44 immediately enters the inlet 44. Inhaled. In the present embodiment, the amount of air sucked from the suction port 44 can be adjusted by the slide damper 48.

  At this time, by providing the third straightening member 47 in the pull-side chamber 6 and the mesh plate 45 provided in the suction port 44, the speed of the air flow sucked into the entire suction port 44 is made uniform.

  Thus, an air curtain is formed above the table surface 4A by an air flow that flows horizontally in the longitudinal direction. The height of the air curtain from the table surface 4A is adjusted to the height and height of each worker so that the height of the air curtain is not disturbed by the airflow hitting the arm or face of the worker. To adjust the height of the air outlet 20 from the table surface 4A.

  In addition, when the airflow of the air curtain is deflected downward due to the influence of indoor air conditioning wind from above the table surface 4A, the angle of the rectifying duct 21 is adjusted by turning the angle adjustment knob 29. The angle of the air flow blown out from the air outlet 20 is set slightly upward.

  Moreover, since the work table 1 of this embodiment is provided with the roll screen 51, dust etc. fall on the table surface 4A from an indoor ceiling etc. by covering the upper part of the table surface 4A with the roll screen 51. Can be prevented.

  Further, the roll screen 51 can prevent the air curtain airflow from being disturbed by the airflow generated in the room by air conditioning or the like, and prevent the air curtain airflow mixed with harmful substances such as formalin mist from moving upward. Therefore, it is possible to more reliably prevent harmful substances from diffusing into the room.

  In order to form the air curtain with a stable laminar air flow, the roll screen 51 is blown by a distance that does not disturb the air flow from the outlet of the push side chamber 5 to the inlet of the pull side chamber. It is necessary to provide it at a position higher than the outlet 20.

  Also, as shown in FIG. 4, a gap G for introducing external air between the blower outlet 20 and the roll screen 51 is secured between the top plate 34 and the upper surface of the movable chamber 5B. There is a need.

  The roll screen 51 covers the entire width of the table surface 4A when the work table 1 is not used, and when used, the operator opens the front side by a length necessary for the work of the table surface 4A. It is desirable.

  On the other hand, the air in the space R formed on the back side of the table surface 4A in the table main body 3 is sucked through the exhaust hose 50 from the air purification device. That is, the air in the space R is sucked radially from the entire circumference of the cylindrical member 9A of each first rectifying member 9 and merged in the merging pipe 11, and further in the merging chamber 12, in the pull side chamber. 6 merges with the air sucked from the suction port 44 and is discharged from the exhaust hose 50 to the air purifier.

As a result, in the space R, a substantially uniform negative pressure is generated as a whole, and air on the table surface 4A is sucked from the vent holes h of the entire porous plate 4 whose upper surface constitutes the table surface 4A.
Therefore, harmful substances such as formalin mist that diverge from the tissue pieces that have entered the petri dish S or the like placed on the table surface 4A are immediately sucked and removed below the table surface 4A.

  In the work table 1 in the present embodiment, the strength of the intake air from the table surface 4A can be adjusted for each place by the slide damper 10 provided in each short pipe 8 communicating with the space R.

  Each slide damper 10 and the slide damper 48 provided in the pull-side chamber 6 can be replaced with other types of flow rate adjusting dampers such as a rotary damper.

  Moreover, in the work table 1 in the above-described embodiment, the blower 18 mounted on the gantry 2 is used as a blower, but the blower is not limited to this, and the blower is installed outside the gantry. May be.

  Further, in the work table 1 in the above-described embodiment, the merging chamber 12 is connected to an external air purification device via the exhaust hose 50. However, the present invention is not limited to this, and the air purification device is mounted on a gantry. It is also possible to do. Further, the air purifying device can be provided separately with a device for sucking air from the table surface and a device for sucking air from the pull side chamber.

  Further, in the work table 1 in the above-described embodiment, the push-side chamber 5 is composed of the fixed chamber 5A and the movable chamber 5B, and the air outlet 20 is provided in the movable chamber 5B that can move up and down with respect to the fixed chamber 5A. The height of the air outlet 20 from the table surface 4A can be adjusted by the vertical movement of the movable chamber 5B, but is not limited to this structure. The push chamber may have a single structure in which the height of the outlet is set at a fixed position.

  Further, in the work table 1 in the above-described embodiment, the air blowing angle from the air outlet 20 is configured to be adjustable, and the angle adjustment is performed using the eccentric cam 24, but the angle adjusting mechanism Is not limited to this. Further, the angle adjustment mechanism may be omitted, and the blowing angle may be a horizontal or a predetermined angle.

  Moreover, in the work table 1 in the above-described embodiment, the roll screen 51 is provided as a transparent cover member, but the cover member is not limited to that in the present embodiment, and at least from the outlet of the push side chamber. Any structure that covers the table surface horizontally at a position higher than the outlet by a distance that does not disturb the air flow toward the suction port of the pull side chamber may be used.

  For example, a transparent acrylic plate, a glass plate, or the like may be used as the cover member, and the cover member may be configured to open and close by sliding horizontally in the width direction of the table surface. The cover member may be omitted depending on the indoor environment used.

  The work table with an air curtain of the present invention can be used when a harmful substance such as formalin mist is generated, for example, when a work for creating a microscope sample from a tissue of a specimen is performed.

DESCRIPTION OF SYMBOLS 1 Work table 2 Base 2A Wheel 3 Table main body 3A Side wall 3B Bottom plate 4 Porous plate 4A Table surface 5 Push side chamber 5A Fixed chamber 5B Movable chamber 6 Pull side chamber 7 1st exhaust port 8 Short tube 9 1st rectifying member 9A Cylindrical member 9B Shield plate 10 Slide damper 11 Merge pipe 12 Merge chamber 13 Air inlet 14 Telescopic hose 15, 16 Hose through-hole 17 Distribution chamber 18 Blower (blower)
19 Second straightening member
20 outlet 21 straightening duct 22 tilting frame 22A bracket 22B ear shaft 22C seal contact portion 23 bearing member 24 eccentric cam 24A thread screw 25 angle adjustment shaft 26, 27 bearing bush 26A, 27A boss portion 28 friction ring 29 angle adjustment knob 29A Flat surface 30 Spring washer 31 Compression coil spring 32 Seal holding portion 32A Seal member 33 Guide rail 34 Top plate 35 Guide shoe 36 Height adjustment knob 37 Bearing 38 Height adjustment shaft 39 Worm 40 Screw shaft 40A Male screw 41 Worm gear
42 Bearing holder 43 Nut bracket 44 Suction port 45 Mesh plate 46 Second exhaust port 47 Third straightening member 48 Slide damper 49 Short tube 50 Exhaust hose 51 Roll screen 51 (cover member)
51A Reel part 51B Pull shaft 51C Screen guide h Vent hole R Space G Gap T Tray S Petri dish

Claims (5)

A table body having the upper surface of a rectangular perforated plate in which fine ventilation holes are dispersed on substantially the entire surface as a horizontal table surface;
A push-side chamber provided at one end in the longitudinal direction of the table surface;
A pull-side chamber provided at the other end in the longitudinal direction of the table surface,
A space defined by a side wall inner surface, a bottom plate upper surface, and a perforated plate lower surface is formed in the table body, and a first exhaust port communicating with an air purifying device opens upward on the bottom plate upper surface, The first exhaust port has a porous cylindrical member that surrounds the first exhaust port substantially concentrically and allows air to pass horizontally from the inside of the space in the radial direction over the entire circumference to be introduced into the first exhaust port. 1 rectifying member is mounted,
The push-side chamber has an intake port that communicates with the blower, and is opposed to the pull-side chamber and is located at a distance above the table surface by a predetermined distance and with a width substantially equal to the width of the table surface. A rectangular blower outlet that is flat in the direction is opened, and a rectifying duct formed by concentrating a number of fine flow paths in the same direction is disposed inside, and the outlet ends of these flow paths are adjacent to the back side of the blower outlet. Are arranged almost horizontally,
Between the intake port and the inlet end of each flow path of the rectifying duct, a second air flow for uniformly introducing the flow of air introduced from the intake port into each flow path of the rectifying duct. A rectifying member is provided,
The pull-side chamber has a rectangular suction port facing the air outlet of the push-side chamber and having a width substantially equal to the width of the table surface and flat in the vertical direction, and communicates with an air purification device. And a third rectifying member is provided between the suction port and the second exhaust port for uniforming the flow velocity in the width direction from the suction port and taking in air. A work table with an air curtain.   A plurality of the first exhaust ports are provided, and the first exhaust port and the second exhaust port are configured to communicate with the air purification device via individually adjustable flow rate adjustment dampers. The work table with an air curtain according to claim 1.   The work table with an air curtain according to claim 1 or 2, wherein the push-side chamber is configured such that the height of the air outlet from the table surface is adjustable.   The rectifying duct is supported in such a manner that it can be tilted around a horizontal axis perpendicular to the longitudinal direction of the table surface with respect to the push-side chamber at a position near the outlet end facing the outlet, and the air outlet angle can be adjusted. The work table with an air curtain according to claim 1, wherein the work table has an air curtain.   A transparent cover member that horizontally covers the table surface is provided at a position that is at least higher than the air outlet by a distance that does not disturb the air flow from the air outlet of the push side chamber to the air inlet of the pull side chamber. The work table with an air curtain according to any one of claims 1 to 4.

Images