JP5855436B2 - Draft chamber - Google Patents

Description

  The present invention relates to a draft chamber having a working chamber for handling chemicals and chemical substances.

  The draft chamber mentioned at the beginning works without leaking harmful gases and unpleasant odors generated when chemicals and chemical substances are mixed, processed, and cleaned with organic solvents into the room. Used for the purpose of recovering from the chamber and discharging to the purification device. As a prior art of the draft chamber, for example, there are those described in Patent Documents 1 and 2 below.

  The draft chamber disclosed in Patent Document 1 blocks a work window (opening) on the front surface of a work room surrounded by a hood (housing) with an air curtain. The door that opens and closes the opening of the work chamber is a hollow door having a ventilation path inside, and the hollow door also serves as an air blowing means, and the air curtain is created by the air blown from the lower end of the hollow door. ing.

  Further, the draft chamber disclosed in Patent Document 2 is provided with an intake port in which a filter is arranged in a hood surrounding the work room, a door that opens and closes the work window on the front surface of the work room is a double glass door, Air is sucked and exhausted through a gap between two glasses of the double glass door.

Japanese Patent No. 2505034 Japanese Patent No. 4389318

  The draft chamber of Patent Document 1 is inserted into a door storage chamber in which the upper part of the door is partitioned from the outside, and the door storage chamber is communicated with an air chamber to which air is supplied from a blower via a damper, and an air passage inside the door. The air supply path of the air ejection means for introducing air into the air is configured. The upper end of the air passage opens into the door storage chamber, and air flows into the opening via the air chamber and the door storage chamber.

  Such a structure complicates the air blowing means, and inevitably increases the size of the draft chamber, increases the number of components, increases the manufacturing effort, and increases costs.

  In addition, the air curtain that shuts off the working window of the chamber is more likely to leak air to the outside as the opening of the window increases, so that the performance is enhanced as the opening of the window increases, In the draft chamber of Patent Document 1, the length of the air passage inside the door is constant regardless of the amount of opening of the door, and therefore the performance adjustment of the air curtain according to the opening of the window cannot be expected.

  Next, in the draft chamber of Patent Document 2 in which suction and exhaust are performed using a gap between two glasses of the double glass door as an exhaust path, the lower end of the double glass door serves as a suction port of the exhaust path. When the distance from the floor surface to the lower end of the double glass door increases, the air flow becomes slow in the area close to the floor surface of the work room, and the work window is likely to become unstable due to the air flow.

  The present invention aims to improve the chamber of Patent Document 1 which is advantageous in terms of preventing gas and odor leakage compared to the method of Patent Document 2, and to simplify the structure of the chamber, reduce the size, and facilitate manufacture. It is a problem to realize such as.

In order to solve the above-described problems, in the present invention, a housing surrounding a work chamber, a slide-lifting transparent hollow door that opens and closes a work window on the front of the work chamber, and a suction that discharges air from the work chamber An air curtain generator including an exhaust device and an air supply source that generates and shuts off the work window when the window is opened, and the air curtain generator is configured to vent the interior space of the hollow door. the configured draft chamber to jetting air from the bottom of the hollow door to,
A flat air nozzle that is narrower and thinner than the hollow door that blows out air supplied from the air supply source is provided above the hollow door, and the air nozzle fixed at a fixed position is the hollow door. air vertical slide door to the upper opening is inserted in a state that is acceptable, the upper opening of the hollow door blocked with a position excluding the inserted portion of the air nozzles are supplied via the air nozzles There the air curtain to the working window is injected downward from the bottom of the air injection holes of the hollow door was shall occur.

  The draft chamber is configured such that when the hollow door is closed, the suction exhaust amount by the suction exhaust device decreases as the opening amount of the door decreases from where the hollow door moved in the closing direction passes through a predetermined position. Is preferred.

  In addition, the large-sized draft chamber is provided with air injection holes in the lower side surface region and the entire lower frame of the horizontal frame (side frame) of the window frame of the work window, and the air supplied from the air supply source is It is preferable to eject from the air injection hole.

  Furthermore, it is preferable that a plurality of intake ports of the suction / exhaust device are provided, and the plurality of intake ports are formed on the rear wall of the working chamber at different height positions.

  In the draft chamber of the present invention, the air curtain generator includes a flat air nozzle, and the air nozzle is slidably inserted into the upper opening of the hollow door to introduce air into the internal space of the hollow door. The air supply path corresponding to the air supply path of the air ejection means employed in the draft chamber of Patent Document 1 can be configured with an air nozzle having a simple structure. Therefore, the chamber structure can be simplified, downsized, manufactured easily, and cost can be reduced.

  Further, since the air nozzle is fixed at a fixed position, the distance from the lower end (jet port) of the air nozzle to the lower end of the hollow door (the path length of the internal passage of the hollow door) is the opening amount of the hollow door (ascending stroke) ) Decreases as the value increases. Thereby, the momentum of the air which blows off from the lower part of a hollow door increases so that the opening degree of a work window becomes large, and the interruption | blocking performance of the window by an air curtain improves.

  For this reason, it is not necessary to unnecessarily increase the capacity of the suction exhaust apparatus or to perform excessive suction, which is advantageous in terms of running cost of the apparatus.

  Note that when the hollow door is closed, excessive suction and exhaust may be performed if the suction and exhaust amount by the suction and exhaust device is gradually reduced as the door opens further after the specified position is decreased. It is avoided and the load of the suction / exhaust device is hardly increased.

  In addition, in the case where an injection hole is also provided in the lower side surface region of the window frame of the work window and the lower side surface region of the horizontal frame, air is also ejected from there, air is injected from almost the entire area around the work window. Therefore, the blocking performance by the air curtain is improved, and it is possible to sufficiently ensure the reliability of preventing leakage of gas and odor from the working room even in a large-size draft chamber.

  Furthermore, if the suction port of the suction / exhaust system is made into a plurality and the plurality of suction ports are formed at different heights on the rear wall of the working chamber, there is a place where the air flow is stagnant inside the working chamber. It is difficult to further reduce the concern that the generated gas and odor remain in the work chamber.

The front view which shows an example of the draft chamber of this invention in the state which closed the hollow door Front view of the draft chamber of FIG. 1 with the hollow door open Plan view of the draft chamber of FIG. Sectional drawing along the ZZ line of FIG. Sectional view along line XX in FIG. Sectional drawing along the YY line of FIG. Enlarged cross-sectional view of the round frame in FIG. Sectional drawing which expands and shows the dashed-dotted frame part of FIG.

  Embodiments of a draft chamber according to the present invention will be described below with reference to FIGS.

  As shown in FIGS. 1 to 3, 5, and 6, the draft chamber 1 of the present invention includes a rectangular housing 2 having a flat work chamber 3 on the inside and an opening at the front of the housing. A slide-lifting hollow door 5 for opening and closing the work window 4, a suction / exhaust device 6 for discharging the air inside the work chamber 3, and an air curtain when the work window 4 is opened to open the window And an air curtain generator 7 that cuts off the air with a film of air.

  The housing 2 is a box that combines a front plate 2a, a back plate 2b, a side plate 2c, an inner wall 2d, a top plate 2e, and a bottom plate 2f. As shown in FIGS. 5 and 6, the housing 2 has a plurality of intake ports 6 a of the suction / exhaust device 6 on the inner wall 2 d covering the rear and upper portions of the work chamber 3, and the height positions of the respective intake ports. Differently provided.

  Further, an exhaust passage 8 (see FIGS. 5 and 6) is provided between the inner wall 2d and the back plate 2b, and the exhaust passage 8 is connected to the suction exhaust device 6.

  The work chamber 3 may be a room in which a holder for fixing experimental equipment or the like is installed, and it is not essential that the floor is flat.

  The work window 4 has a window frame 4a in which a lower frame Bf (see FIG. 8) having an air passage therein and a horizontal frame Sf (see FIG. 7) having an air passage inside are combined. The horizontal frame Sf of the window frame 4a is a frame that also serves as a slide guide that guides by inserting both side edges of the hollow door 5 into a groove.

  The hollow door 5 generates an internal space 5b between two transparent glass plates 5a, and the internal space is used as a ventilation path when an air curtain is made. The prototype draft chamber uses a transparent glass plate 5a having a thickness of 5 mm, and creates an internal space 5b having a thickness direction dimension of 10 mm (see FIGS. 7 and 8) between the two transparent glass plates 5a and 5a. I am letting. Therefore, the total thickness t (see FIG. 7) of the hollow door 5 is 20 mm, and the thickness of the hollow door is sufficiently reduced.

  In the hollow door 5, the lower opening of the internal space 5b is closed by the lower frame 5c, and both lateral openings are closed by the side frame 5e. A plurality of air injection holes 9 (see FIGS. 4 and 7) are provided in the lower frame 5c at predetermined intervals, and air is blown from the air injection holes 9 below the hollow door 5 (opening of the work window). A curtain is created. The air injection hole 9 is preferably the illustrated horizontally long slit, but even a small round hole can provide a stable air curtain by providing a large number of intervals.

  The suction / exhaust device 6 is a known blower, and sucks air inside the working chamber 3 and discharges it toward the subsequent purification processing device via the exhaust duct 12. This suction / exhaust device 6 can pass a pressure-feed flow even when it is stopped.

  The air curtain generator 7 includes an air supply source 7a (which is a blower in the illustrated apparatus) and an air nozzle 7b which characterizes the present invention. The air supply source 7 a is arranged at a position biased to the front part of the chamber at the top of the housing 2. The air nozzle 7 b is installed with its position fixed above the hollow door 5.

  The air nozzle 7b is a flat tube that can be inserted into the internal space 5b of the hollow door that forms the air supply path between the air supply source 7a and the hollow door 5, and the tip (lower end) of the air nozzle 7b is It is inserted into the upper opening of the hollow door 5 from top to bottom. The illustrated air nozzle 7b has an overall thickness of about 10 mm, and allows the door to slide up and down while maintaining the insertion state.

  The upper opening of the internal space 5b of the hollow door 5 is sealed by an upper frame 5d (see FIG. 8) except for the place where the air nozzle 7b is inserted.

  A gap g1 (see FIG. 5) that allows the work chamber 3 to communicate with the outside when the hollow door 5 is closed is formed around the air nozzle 7b. Further, a gap g2 (also see FIG. 5) that allows the work chamber 3 to communicate with the outside is formed in the lower part of the lower frame Bf of the window frame of the work window 4.

  In addition, the three-way branch pipe 7c is connected to the air supply port of the air supply source 7a, one of the outlets of the three-way branch pipe is connected to the air nozzle 7b, and the other two outlets are shown in FIGS. The hose 10 is individually connected to the left and right horizontal frames Sf of the window frame 4a.

  An air injection hole 11 (see FIGS. 6 and 7) is provided in the lower side surface region of the horizontal frame Sf, and the air sent into the horizontal frame Sf via the hose 10 is injected from the air injection hole 11. The Also, the lower frame Bf of the work window is provided with air injection holes 11 (see FIG. 9) in the entire longitudinal direction, and the internal space of the lower frame Bf communicates with the internal space of the horizontal frame Sf via the hose 10. The supplied air is also introduced into the lower frame Bf and is ejected from the air ejection holes 11 of the lower frame Bf.

  Thereby, as shown in FIG. 6, when the hollow door 5 is opened largely, air is injected from almost the entire area around the work window 4, and the blocking performance by the air curtain is enhanced. The air injection hole 11a provided in the lower frame Bf may be a hole opened on the upper surface of the lower frame Bf. However, considering the prevention of foreign matter intrusion, a hole with a rearward opening as shown in the figure opened on the inner side surface of the lower frame Bf is provided. preferable. The air blown out from the hole of the rearward opening enhances the airflow that flows from the front part of the work chamber 3 toward the rear part. Therefore, even when the air curtain formed at the lower part of the hollow door 5 becomes weak (the air curtain stops at the position of the lower frame Bf), the prevention of leakage of gas and odor is stably performed.

  The configuration in which air is also ejected from the horizontal frame Sf and the lower frame Bf is effective when the draft chamber is increased in size. However, depending on the size of the chamber, the configuration may be omitted even if the configuration is omitted. Leakage prevention may be implemented without a shortage.

  Therefore, the air injection holes provided in the horizontal frame Sf and the lower frame Bf are not essential. In the draft chamber in which the horizontal frame Sf and the lower frame Bf do not have air injection holes, the hose 10 and the three-way branch pipe connected to the air supply port of the air supply source 7a are unnecessary, and the air supply source 7a has a small capacity. That's it.

  In the illustrated draft chamber, when the hollow door 5 is closed, the suction exhaust amount by the suction exhaust device 6 decreases step by step as the door opening amount decreases from where the door passes through a predetermined position. .

  The suction exhaust amount may be gradually decreased in accordance with a change in the opening of the door. Stopping the suction / exhaust during use is not preferable because air in the working chamber may be retained, so the suction / exhaust device is basically put into operation during use of the chamber. This reduction in the amount of suction and exhaust is an effective function for avoiding the working chamber 3 from being in a reduced pressure state, and the burden on the suction and exhaust device 6 can be reduced.

  The draft chamber 1 configured as described above always operates the suction / exhaust device 6 during use. During the use, when the hollow door 5 is closed as shown in FIG. 5 or when the opening amount of the door is small, the operation is performed at a low speed without performing the full opening operation. In that situation, air for exhaust is created in the working chamber 3 mainly by the air supplied from the air supply source 7a. The work chamber 3 is not excessively decompressed. Therefore, an increase in the burden on the suction / exhaust device 6 can be suppressed. Less power is wasted, leading to lower running costs.

  In the state shown in FIG. 5, the air flow generated in the work chamber 3 also sucks air from the outside through the gaps g1 and g2.

  When the hollow door 5 is opened as shown in FIG. 6, suction and exhaust by the suction / exhaust device 6 is performed together with the operation of the air curtain generator 7, and an air flow as shown in FIG. To be produced. The suction / exhaust by the suction / exhaust device 6 is adjusted according to the opening amount so that the lower the suction amount of the hollow door 5, the lower the suction rate. In this way, it is ensured that harmful gases and unpleasant odors generated in the working chamber 3 are discharged toward the purification device through the suction exhaust device 6 and leak out from the working chamber 3 into the room where the draft chamber 1 is installed. To be prevented.

  In addition, as can be seen from FIG. 5 in which the hollow door 5 is closed and in FIG. 6 in which the hollow door 6 is open, the draft chamber of the present invention is from the lower end of the hollow door 5 to the tip of the air nozzle 7b. The distance L decreases as the opening amount of the hollow door 5 increases, and increases as the opening amount of the hollow door 5 decreases. As a result, the momentum of the air blown from the lower part of the hollow door 5 increases and decreases according to the increase and decrease of the opening of the work window 4, and the performance adjustment of the air curtain according to the opening of the work window 4 just by opening and closing the hollow door 5. Is made.

DESCRIPTION OF SYMBOLS 1 Draft chamber 2 Case 2a Front plate 2b Back plate 2c Side plate 2d Inner wall 2e Top plate 2f Bottom plate 3 Work chamber 3a Inner wall 4 Work window 4a Window frame Bf Lower frame Sf Horizontal frame 5 Hollow door 5a Transparent glass plate 5b Internal space 5c Below Frame 5d Upper frame 5e Side frame 6 Suction / exhaust device 6a Intake port 7 Air curtain generator 7a Air supply source 7b Air nozzle 7c Three-way branch pipe 8 Exhaust path 9 Air injection hole 10 Hose 11 Air injection hole 11a Air injection hole 12 Exhaust duct

Claims (4)

A housing (2) surrounding the work chamber (3), a slide-lifting transparent hollow door (5) for opening and closing a work window (4) on the front of the work chamber, and air inside the work chamber (3) Suction exhaust device (
6) and an air curtain generator (7) including an air supply source (7a) for generating and shutting off the work window (4) when the window is opened, and the air curtain generator (7 ) Is a draft chamber configured to eject air from the lower portion of the hollow door using the internal space (5b) of the hollow door (5) as a ventilation path ,
A flat air nozzle (7b) that is narrower and thinner than the hollow door (5) that blows out air supplied from the air supply source (7a) is provided above the hollow door (5). its air nozzle which is fixed at a position (7b) are inserted in a state in which the upper opening is vertical slide door is allowed of the hollow door (5), at a position other than the inserted portion of the air nozzles (7b) wherein the upper opening of the hollow door (5) is blocked, is injected downward from the bottom of the air injection holes (9) of the air nozzle the air supplied via the (7b) hollow door (5) configured draft chamber such that the air curtain is arising in the working window (4). During closing of the hollow door (5), claims the hollow door suction exhaust amount by the suction exhaust device (6) as the amount of opening of the door from where it passes a predetermined position is reduced is configured to reduce The draft chamber according to claim 1. An air injection hole (11) is provided in the entire area of the lower side surface region and the lower frame (Bf) of the horizontal frame (Sf) of the window frame of the work window (4), and is supplied from the air supply source (7a). draft chamber according to claim 1 or 2 configured as air also ejected from the air jet hole (11). A plurality of intake ports (6a) of the suction / exhaust device (6) are provided , and the plurality of intake ports (6a) have a height on the inner wall (2d) of the housing that covers the rear and upper portions of the work chamber (3). The draft chamber according to any one of claims 1 to 3, wherein the draft chamber is formed at different positions.

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