JP2005046790A - Gas cleaning device and coating booth - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To steadily obtain high gas cleaning performance while reducing a maintenance load by employing a rational scattering structure for scattering a top layer cleaning liquid of a storage part together with a flow-down cleaning liquid from a flow-down wall. <P>SOLUTION: This device is provided with a stopping weir 11 forming a storage part 12 of cleaning water W and a flow-down wall 7 of which the wall surface of the storage part 12 side is a flow-down face 7a of the cleaning water W, and the stopping weir 11 and the flow-down wall 7 are arranged in parallel with each other in plan view with the bottom end edge of the flow-down wall 7 located above the top end edge of the stopping weir 11 and arranging a space 13 between the top end edge of the stopping weir 11 and the bottom end edge of the flow-down wall 7 as a throttled gas-passage for cleaning gas, and thereby a gas A to be cleaned is made to pass through the space 13 from the storage part 12 side at high speed. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention relates to a gas purification device used for removing paint mist from paint mist-containing air, removing dust from various gases, and the like, and a coating booth using the gas purification device.

  Conventionally, a coating booth is generally equipped with a gas purification device that collects and removes paint mist contained in the exhaust air from the painting booth, but it is provided with a falling wall that allows the cleaning liquid to flow down along the wall surface. Coating with a gas purification device that traps the paint mist in the exhaust air in the scattered droplets of the cleaning liquid by passing the exhaust air from the painting work area at high speed through the throttle air passage (so-called Venturi) in the combined state of Conventionally, there have been the following booths (b) and (b).

  (A) As shown in FIG. 6, a flow-down wall 7 is provided for flowing the wash water W supplied from the overflow weir 8 along the wall surface, and the wash water flow lower surface 7 a of the flow-down wall 7 is sprayed from the upper part of the painting work area 1. In addition to the work area forming wall surface extending over the lower part, a reservoir 12 for cleaning water W is provided below the spray coating work area 1 and the flow wall 7, and the water surface of the reservoir 12 and the lower edge of the flow wall 7 (bent in this example) A painting booth (see Patent Document 1) provided with a gap 13a serving as a throttle air passage for gas cleaning between the lower end edge of the cross-sectional shape.

  In other words, in the painting booth of (A), excessive spray paint is prevented from adhering to the wall surface in the painting work area 1 by the flowing-down washing water W in the falling wall 7. Further, the paint mist-containing air A in the painting work area 1 is passed through the gap 13a at a high speed in the discharge process with the flowing wash water W from the falling wall 7, and the surface washing water in the reservoir 12 is accompanied by this passage. B is blown off by the discharged air A and scattered together with the flowing wash water W from the falling wall 7, so that the paint mist in the discharged air A is captured by the scattered water droplets, thereby purifying the discharged air A. .

  (B) As shown in FIG. 7, a flow-down wall 7 is provided for flowing the wash water W supplied from the overflow weir 8 through the bottom wall 3 along the wall surface, and this flow-down wall 7 is disposed below the spray painting work area 1. In addition, a reservoir 12 for the cleaning water W is provided below the flow-down wall 7, and the gas is washed between the water surface of the pool 12 and the lower end edge of the flow-down wall 7 (sawtooth-shaped lower end edge in this example). A curved plate 40 that forms a gap 13b as a throttle air passage and extends from the wash water W of the reservoir 12 to the water surface on the back side of the flow-down wall 7 has an upper end edge at the lower end edge of the flow-down wall 7 A coating booth provided in a state where the concave curved plate surface is positioned above the gap 13b from the back side of the falling wall (see Patent Document 2).

That is, in the painting booth of (B), the paint mist-containing air A in the painting work area 1 is combined with the washing water W flowing down from the falling wall 7 in the discharge process, as in the painting booth of (A). While passing through the gap 13b at a high speed, immediately after the passage, the exhaust air A is turned upward by the curved plate 40, and the accompanying movement by the air current of the surface cleaning water W in the reservoir 12 is guided by the curved plate 40, The surface washing water W is efficiently scattered upward together with the washing water W flowing down from the falling wall 7, and the paint mist in the discharged air A is captured by the scattered water droplets to purify the discharged air A. .
Reference numeral 41 denotes a rectifying plate that guides the redirection of the discharged air A that has turned upward.
JP 9-47701 A JP-A-7-171453

  However, in the painting booth of (a) (see FIG. 6), the exhaust air A from the painting work area 1 is simply passed through the gap 13a in a horizontal direction at high speed, and the air A immediately after the passage (that is, scattering) The air that is in the process of trapping paint mist by water droplets) does not collide with the member, so there is little paint accumulation due to paint mist adhering to the member, and there is less burden on the paint removal maintenance, and adhesion Blowing off the surface cleaning water W by passing the exhaust air A along the water surface of the reservoir 12 at a high speed, although there is little decrease in the paint mist removal performance over time due to paint accumulation (that is, deterioration in air purification performance over time). Therefore, since the cleaning water W of the reservoir 12 is scattered, the scattering efficiency of the reservoir cleaning water W is lower than that of the downstream cleaning water W from the falling wall 7. As a result, the efficiency of washing water spraying is low, and so-called slip-off areas where local airflow passages with low distribution density of scattered water droplets are generated easily occur. There was a problem that the performance was lowered.

  On the other hand, in the paint booth of (b) (see FIG. 7), the spraying efficiency of the reservoir cleaning water W can be increased by the installation of the curved plate 40 compared to the paint booth of (a), and the paint mist is correspondingly increased. Although the removal performance can be improved, since the exhaust air A immediately after passing through the gap 13b is blown to the curved plate 40, the back surface of the flow-down wall 7, and the flow straightening plate 41, the curved plate 40, the back surface of the flow-down wall 7, the flow straightening plate There are many deposits of paint due to the paint mist adhering to 41, and furthermore, it is difficult to remove the adhering paint because the adhering place is narrow and the burden of the adhering paint removal maintenance becomes large. There was also a problem that the decrease in the paint mist removal performance (air purification performance) over time due to paint deposition also increased.

  In view of the above circumstances, the main object of the present invention is to achieve high gas purification while reducing the maintenance burden by adopting a rational scattering structure to splash the surface layer cleaning liquid of the reservoir together with the flowing cleaning liquid from the falling wall. The point is that performance can be stably obtained.

[1] A first characteristic configuration of the present invention relating to a gas purification device is as follows:
A stop weir that forms a reservoir for the cleaning liquid, and a flow-down wall with the wall surface on the side of the reservoir being the lower surface of the cleaning liquid,
With the lower end edge of the flow-down wall positioned above the upper end edge of the stop weir, the stop weir and the flow-down wall are arranged in parallel in a plan view,
The gap between the upper end edge of the stop weir and the lower end edge of the falling wall is used as a throttle air passage for gas cleaning, and the cleaning target gas is passed through the gap from the reservoir side at a high speed. is there.

  That is, in this first characteristic configuration, the above-mentioned gap (stop weir upper edge and lower wall lower edge) as the gas cleaning throttle air passage from the reservoir side in a state where the gas to be cleaned is merged with the liquid flowing down from the wall. As the cleaning liquid flowing down from the falling wall is scattered at high speed, the surface cleaning liquid in the reservoir is scattered from the top edge of the stop weir with the high-speed cleaning target gas. The object to be removed (for example, dust or paint mist) in the gas to be cleaned is captured by the scattered liquid droplets of the flowing-down cleaning liquid and the reservoir cleaning liquid, and the cleaning target gas is purified.

  That is, in the same way as the falling cleaning liquid from the falling wall is peeled off at the lower edge of the falling wall and scattered into the high-speed air flow of the gas to be cleaned, the surface cleaning liquid in the reservoir is peeled off at the upper edge of the stop weir to be cleaned. By adopting a form that scatters into a high-speed gas stream (in short, a form in which the upper edge of the stop weir is used as the liquid peeling guide part to disperse the surface cleaning liquid), the above-mentioned conventional (a) coating booth In this way, it is possible to effectively increase the spraying efficiency of the reservoir cleaning liquid compared to the case where the surface cleaning water of the reservoir is scattered by simply passing the exhaust air along the water surface of the reservoir at high speed. In addition, it is possible to improve the efficiency of spraying the cleaning liquid as a whole, and to effectively prevent the occurrence of so-called slip-off portions where a loop-through air passage having a low distribution density of scattered droplets is locally generated. High gas It is possible to obtain a reduction performance.

  In addition, as described above, high cleaning liquid scattering efficiency can be obtained simply by passing the cleaning target gas at high speed through the gap in the lateral opening formed by arranging the lower end edge of the flow-down wall above the upper end edge of the stop weir. Since the curved plate and the current plate (that is, the member that collides with the gas immediately after passing through the gap for improving the scattering efficiency) can be made unnecessary as in the conventional (b) coating booth described above, It is possible to reduce the deposition of the object to be removed, thereby reducing the burden of the deposit removal maintenance, and effectively preventing the deterioration of the gas purification performance due to deposit accumulation over time. .

  For these reasons, according to the first characteristic configuration, it is possible to effectively achieve the intended task of stably obtaining high gas purification performance while reducing the maintenance burden.

[2] A second characteristic configuration of the present invention is the above first characteristic configuration,
The lower end edge of the flow-down wall is arranged so as to be offset toward the side of the reservoir relative to the upper end edge of the stop weir in the horizontal direction or toward the side opposite to the reservoir.

  That is, according to the first characteristic configuration as described above, it is possible to obtain high cleaning liquid scattering efficiency and effectively improve the gas purification performance, but the lower end edge of the falling wall is disposed above the upper end edge of the stop weir. In order to allow the gas to be cleaned to pass from the side of the reservoir to the gap of the lateral opening formed in this way at a high speed and to scatter the falling cleaning liquid from the falling wall and the surface layer cleaning liquid of the reservoir, When adopting a structure in which the lower edge of the flow-down wall is arranged above, depending on various conditions such as the structure around the gap and the structure of the gas guide to the gap, the surface cleaning liquid of the reservoir part is inclined downward from the upper edge of the stop weir. Spattering or slanting upward will cause the reservoir cleaning liquid splashing area to be formed at a location outside the central axis of the cleaning target gas due to the slanting scattering. Removal object and scattered droplets The contact efficiency (i.e., capture efficiency of capturing the removed object by scattering droplets) may be lowered.

  On the other hand, as a result of the experiment, as described above, if the lower edge of the falling wall is disposed so as to be offset toward the reservoir portion in the horizontal direction with respect to the upper edge of the stop weir, The splashing direction of the reservoir cleaning liquid can be adjusted upward while keeping the scattering direction almost horizontal, and conversely, the lower end edge of the falling wall is fixed relative to the upper end edge of the weir. It was found that if the liquid was washed away from the opposite side, the spraying direction of the cleaning liquid flowing down from the downstream wall could be adjusted to the downward direction while the spraying direction of the cleaning liquid flowing from the falling wall was kept almost horizontal.

  Therefore, depending on the conditions, either one of the offset arrangement on the side of the reservoir part or the offset arrangement on the opposite side of the reservoir part is selected, and the offset dimension in the offset arrangement (upper edge of the stop weir) If the appropriate dimension is selected for the horizontal separation distance between the bottom wall and the bottom edge of the flow wall, both the flow cleaning liquid from the flow wall and the surface cleaning liquid in the reservoir can be scattered horizontally, A cleaning liquid scattering region having a high distribution density may be formed in a state where the central axis of the region substantially coincides with the path central axis of the gas to be cleaned and in a state of extending to the downstream side in the gas passage direction while having an appropriate spread. Thus, it is possible to ensure high contact efficiency between the object to be removed in the cleaning target gas and the scattered droplets, and it is possible to reliably and effectively improve the gas purification performance.

  In addition, the lower end edge of the falling wall is arranged in a horizontal direction relative to the upper end edge of the stop weir and is shifted to the side of the reservoir part or to the side opposite to the reservoir part. Even when adjusting the upward or downward side, the flow direction of the cleaning solution flowing down from the falling wall is maintained in the horizontal direction because the flowing kinetic energy of the flowing cleaning solution acts on the side that suppresses the change in the scattering direction. It is thought to do.

[3] The third characteristic configuration of the present invention is the above first or second characteristic configuration,
The stop weir is provided with an inclined weir upper surface extending obliquely downward from the upper end edge of the stop weir toward the bottom of the reservoir.

  That is, when the stop weir is formed of a simple plate-like member, depending on conditions such as the passing air speed of the cleaning target gas, the vicinity of the stop weir (plate-like member) with high-speed passage of the cleaning target gas in the gap The liquid level of the reservoir cleaning liquid fluctuates up and down in a wave, and the phenomenon that the spraying direction of the reservoir cleaning liquid fluctuates up and down is caused by this, and this makes the formation of the cleaning liquid scattering area unstable, Gas purification performance may be reduced.

  On the other hand, as a result of the experiment, if the weir upper surface with the inclined posture as described above is provided in the stop weir, the wave top and bottom fluctuations of the reservoir cleaning liquid in the vicinity of the upper end edge of the stop weir are effectively suppressed. It turns out that you can. Therefore, by providing the dam upper surface with this inclined posture, it is possible to stabilize the spraying direction of the reservoir cleaning liquid and to stabilize the formation of the cleaning liquid scattering region, thereby stabilizing the high gas purification performance. Can be maintained.

  In the implementation of the third feature configuration, the weir upper surface in the inclined posture is not limited to the flat surface in the inclined posture, and depending on the case, the sectional shape of the side view may be a convex curved inclined surface or a concave curved inclined surface. Alternatively, it may be an inclined surface or a wavy inclined surface whose side sectional shape is refracted.

[4] A fourth feature configuration of the present invention is any one of the first to third feature configurations described above.
The upper edge of the flow-down wall is used as an overflow weir, and the cleaning liquid is supplied to the flow surface by overflow from the overflow weir.

  That is, according to this configuration, for example, compared with the case where the cleaning liquid for flowing down is supplied to the lower surface of the falling wall by jetting the cleaning liquid from the nozzle, the cleaning liquid for flowing down is made uniform in the lateral width direction of the downstream wall. In addition, it is possible to supply the cleaning liquid from the lower end edge of the falling wall more uniformly and stably in the width direction of the falling wall, and thereby the scattering of the cleaning liquid. The formation of the region can be effectively equalized and stabilized in the width direction of the gap, and the gas purification performance can be improved accordingly.

[5] A fifth characteristic configuration of the present invention is the fourth characteristic configuration described above,
In the upper end edge of the flow-down wall as the overflow weir, the flow lower surface is an inclined flow lower surface or a bent flow lower surface in such a posture that the upper surface is separated from the reservoir in the horizontal direction.

  In other words, when the upper edge of the falling wall as the overflow weir is formed but the flow surface of the upper edge is simply a flat plane, the cleaning liquid overflows depending on the overflow flow and other conditions. Overflowing from the upper edge of the falling wall in a thrown state (in other words, overflowing with a separation gap formed between the upper edge of the lower wall and the flow surface), and from the lower edge of the lower wall Dispersion of the flowing cleaning liquid may be disturbed, which may cause the formation of the cleaning liquid scattering region to become unstable, thereby reducing the gas purification performance.

  On the other hand, if the flow lower surface is the inclined flow lower surface or the bent flow lower surface as described above at the upper edge of the falling wall as the overflow weir, it is possible to effectively prevent the cleaning liquid from overflowing in the throwing state, Can be reliably and stably transmitted to the flow surface, thereby further stabilizing the formation of the cleaning liquid scattering region, and improving the gas purification performance more effectively. Can do.

[6] A sixth feature configuration of the present invention is the fourth or fifth feature configuration,
An upper downflow wall is provided for supplying the cleaning liquid to the overflow cleaning liquid reservoir formed by the overflow weir in the form of flowing down along the wall surface.

  In other words, if the flow surface is a surface with a large cleaning liquid flow down length (ie, vertical length) due to some necessity, such as a work area forming wall surface extending from the top to the bottom of the work area, the flow down length is If the flow rate is large, the turbulence factor that the film-like cleaning solution in the middle of the flow receives increases, and this causes disturbance in the flow of the cleaning solution flowing from the lower edge of the falling wall, resulting in unstable formation of the cleaning solution scattering region. There is.

  On the other hand, if the structure which provides the above-mentioned upper flow-down wall is taken, it will replace with the flow lower surface of the said flow-down wall (namely, lower flow-down wall if it says with respect to an upper flow-down wall), and the washing | cleaning liquid flow lower surface of this upper flow-down wall It is possible to secure the necessary flow length of the cleaning liquid to shorten the flow length of the cleaning liquid on the lower surface, and even if the film-like flow cleaning liquid on the lower surface of the upper flow wall is disturbed for some reason, the upper flow wall After receiving the washing liquid flowing down from the overflow washing liquid reservoir, the overflow from the overflow weir can be stably supplied to the lower surface of the falling wall. While ensuring the length, it is possible to stabilize the scattering of the flowing cleaning liquid from the lower edge of the falling wall, and to stabilize the formation of the cleaning liquid scattering region.

[7] The seventh characteristic configuration of the present invention related to the painting booth is a configuration using the gas purification device including any one of the first to sixth characteristic configurations.
In a state where the cleaning liquid flow lower surface of the falling wall or the cleaning liquid flow lower surface of the upper flow falling wall is a work area forming wall surface extending from the upper part to the lower part of the spray coating work area, a spray coating work area is formed above the reservoir part,
In this spray coating work area, the paint mist-containing air is discharged from the spray paint work area in the form of passing through the gap as a gas to be cleaned.

  In other words, according to the seventh characteristic configuration, it is possible to prevent surplus spray paint from adhering to the wall surface in the spray painting work area by the wash-down cleaning liquid on the lower surface of the wash liquid flow of the above-described flow-down wall or the upper flow-down wall as the work area forming wall surface. can do.

  In addition, by discharging the paint mist-containing air in the spray painting work area from the spray paint work area in the form of passing through the gap as the cleaning target gas, the paint mist in the discharged air is obtained as an effect of the first characteristic configuration described above. The paint mist in the exhausted air is efficiently captured and sprayed by the splashing liquid of the flow-down cleaning liquid and the reservoir cleaning liquid from the flow-down wall and sprayed while effectively preventing the paint from being deposited on the member. It is possible to effectively purify the exhaust air from the painting work area. From these, compared to the conventional painting booths (a) and (b) described above, both maintenance and exhaust air purification are possible. It can be an excellent painting booth.

  FIG. 1 shows a painting booth. As a forming wall of the spray painting work area 1, an upper falling wall 3 that partitions the painting work area 1 and the exhaust chamber 2 in a vertical posture extending from the upper part to the lower part of the painting work area 1 is provided. The upper overflow dam 4 is used as the upper overflow dam 4 and an upper water supply basin 5 for supplying the cleaning water W to the wall surface 3a on the work area side of the upper flow dam 3 is provided by overflowing from the upper overflow dam 4. By supplying the cleaning water from the upper water supply trough 5, the wall surface 3a on the working area side of the upper flow-down wall 3 is used as the lower surface of the cleaning water flow, and the cleaning water W flows down along the wall surface in a film flow state.

  That is, when performing the spray painting operation on the article 6 in the painting work area 1, by performing the spray painting work toward the upper flow-down wall 3 side, the surplus spray paint reaching the upper flow-down wall 3 is placed on the upper part. Washing is carried out with the running wash water W on the washing water flow lower surface 3a (working area side wall surface) of the falling wall 3, thereby preventing the paint from adhering to the working area wall surface.

  The washing water flow lower surface 3a of the upper flow-down wall 3 has an arcuate cross-sectional shape in which the lower end portion of the cleaning water flow lower surface 3a becomes gentler toward the lower side, and the lower end portion (that is, the working region side distal end portion) becomes substantially horizontal. Further, as shown in FIG. 2, in order to form the arcuate surface portion 3b, the lower end portion of the upper flow wall 3 whose lower end portion is bent into a similar arcuate cross-sectional shape (vertical end on the working area side) is in a vertical position. The lower flow-down wall 7 is continuously provided, and the upper end edge portion of the lower flow-down wall 7 is projected as a lower overflow weir 8 above the tip of the arcuate surface portion 3b.

  That is, the wash water W that has flowed down the wash water flow lower surface 3 a of the upper flow-down wall 3 is formed for overflow by forming the overflow wash water reservoir 9 at the lower end of the upper flow-down wall 3 by the lower overflow weir 8. Is received by the washing water reservoir 9 and supplied to the wall surface 7a on the work area side of the lower flow wall 7 by overflowing from the lower overflow weir 8, whereby the work area side of the lower flow wall 7 is The wall surface 7a is used as the lower surface of the washing water flow on the lower side, and the washing water W is caused to flow down along the wall surface in a film-like flow state, like the upper falling wall 3.

  On the other hand, the floor 10 in the painting work area 1 is a lattice floor, and a stop weir 11 is provided below the lower flow-down wall 7, and the wash water reservoir 12 at the bottom is provided below the lattice floor 10 by the stop weir 11. Is formed.

  The stop weir 11 and the lower flow wall 7 are arranged in parallel in a plan view with the lower end edge of the lower flow wall 7 positioned above the upper end edge of the stop weir 11. A gap 13 between the upper edge and the lower edge of the lower wall 7 is communicated with the lower part of the exhaust chamber 2 as a throttle air passage for gas cleaning (that is, a venturi).

  Further, the upper portion of the exhaust chamber 2 is connected to the exhaust fan 15 through the exhaust air passage 14, and an eliminator 16 (drainer) is accommodated in the exhaust chamber 2, and the bottom portion of the exhaust chamber 2 is a receiving portion 17 for the washing water W. It is.

  That is, in this painting booth, during the spray painting operation, the exhaust fan 15 is operated so that the paint mist-containing air A in the painting work area 1 passes through the gap 13 from the bottom washing water reservoir portion 12 side as a cleaning target gas. In this case, the air is sucked into the exhaust chamber 2, and at this time, the flowing wash water W from the lower downstream wall 7 is scattered from the lower end edge of the lower downstream wall 7 to the inner side of the exhaust chamber 2 by the high-speed airflow in the gap 13. At the same time, the surface cleaning water W of the bottom cleaning water reservoir 12 is stopped and scattered from the upper edge of the weir 11 to the inner side of the exhaust chamber 2, so that the intake air from the gap 13 is scattered by the scattered water droplets of the cleaning water W. The paint mist in A is captured and the intake air A is purified.

  Then, the intake air A that has captured and purified the paint mist is collected and removed by the eliminator 16 in the exhaust chamber 2 after the water droplets contained in the air are collected and discharged to the outside through the exhaust air passage 14. Of the falling water W from the eliminator 16 (that is, the collected water of water droplets collected by the eliminator 16) and the scattered water from the lower edge of the lower flow wall 7 and the upper edge of the stop weir 11, do not reach the eliminator 16. The dropped water W is collected in the receiving portion 17 at the bottom of the exhaust chamber, and the cleaning water W collected in the receiving portion 17 is sent to the separation device 19 by the pump 18, and the contained paint component is separated and removed by the separation device 19. In addition, the water is circulated and supplied to the upper water tank 5 and the bottom washing water reservoir 12 through the return water channel 20.

  The supply flow rate of the cleaning water W to the bottom cleaning water reservoir 12 (that is, the overflow flow rate from the stop weir 11 in the state where the exhaust fan 15 is stopped, however, in this example, the cleaning water flowing down from the lower downstream wall 7 And the supply flow rate of the wash water W to the upper water tank 5 (that is, the wash water flow rate from the lower flow wall 7) depends on various conditions such as the passing air amount and the passing air speed in the gap 13. Set each to an appropriate flow rate.

  In this painting booth, when the lower end edge of the lower flow wall 7 is disposed immediately above the upper end edge of the stop weir 11, the gap 13 as the throttle air passage is formed from the upper end edge of the stop weir 11. The direction of washing water scattering (that is, the direction of scattering of the surface washing water W in the bottom washing water reservoir 12) is obliquely downward, whereas the lower edge of the lower flow wall 7 is stopped in a horizontal direction from the upper edge of the weir 11. By displacing the required amount by the required amount toward the bottom washing water reservoir 12 side, the direction of washing water splashing from the upper edge of the stop weir 11 is adjusted upward, and as shown in FIG. The wash water scattering region X having a high distribution density of splashed water droplets is formed such that the wash water W flowing down from the flow wall 7 and the surface wash water W of the bottom wash water reservoir 12 are both scattered laterally while spreading. Is the center axis of the area a gap 13? Inhalation substantially matching state in the path central axis of the air A, and is adapted to form a state extending to the downstream side of the air passage direction while maintaining an appropriate expansion.

  Further, the stop weir 11 has a structure including a weir upper surface 11a having an inclined posture extending obliquely downward from the upper end edge toward the bottom of the bottom washing water reservoir portion 12, and thereby, the influence of the high-speed air flow in the gap 13 Thus, the water surface of the cleaning water W in the bottom cleaning water reservoir 12 is prevented from wavely moving up and down in the vicinity of the upper end edge of the stop weir 11, and the direction of the wash water scattering from the upper end edge of the stop weir 11 is stabilized. It is like that.

  In each of the upper edge of the upper flow wall 3 that forms the upper overflow weir 4 and the upper edge of the lower flow wall 7 that forms the lower overflow weir 8, the lower surface 3a of the wash water flow of the upper flow wall 3 and the lower part The cleaning water flow lower surface 7a of the flow-down wall 7 is positioned so as to move away from the bottom cleaning water reservoir 12 in the horizontal direction toward the upper end side (in other words, the posture approaching the upper water tank 5 and the overflow cleaning water reservoir 9). In addition, the arc-shaped surface portion 3b of the cleaning water-flow lower surface 3a of the upper downstream wall 7 is provided with a water splash prevention plate 21 in a posture substantially along the arc-shaped surface portion 3b. Is provided in a state in which it is immersed in the cleaning water W of the overflow cleaning water reservoir 9 and in a state in which a guide channel 21a is formed between it and the arcuate surface portion 3b.

  That is, in the formation part of each of the upper overflow weir 4 and the lower overflow weir 8, the cleaning water flow lower surface 3a of the upper downstream wall 3 and the cleaning water flow lower surface 7a of the lower downstream wall 7 are inclined flow lower surfaces 3s and 7s as described above. The overflow of the wash water W from the overflow weirs 4 and 8 in the thrown state is prevented, and the wash water W is reliably and stably applied to the flow lower surfaces 3a (3s) and 7a (7s) of the flow walls 3 and 7. By overflowing the state to be transmitted and by providing the water splash prevention plate 21, the wash water W flowing on the wash water flow lower surface 3 a of the upper flow wall 3 is between the water splash prevention plate 21 and the arcuate surface portion 3 b. In this way, the water flows stably into the wash water W of the overflow wash water reservoir 9 through the guide channel 21a without splashing, so that the wash water scatters from the lower edge of the lower downstream wall 7 To make the cleaning water splash area X It is so as to further stabilize the formation.

  The lower flow-down wall 7 is formed by an upper-side fixed wall portion 7A and a lower-side movable wall portion 7B that is slidable in the vertical direction with respect to the fixed wall portion 7A. By sliding the movable wall portion 7B in the up and down direction with the bolts 22 that fix the movable wall portion 7B loosened, the opening size in the up and down direction of the gap 13 that is a lateral opening depends on conditions such as the amount of air passing through the gap. It can be adjusted as appropriate.

  Reference numeral 23 denotes a lower water tank that supplies the cleaning water W fed through the return water channel 20 to the bottom cleaning water reservoir 12, and a plurality of outlets 23 a are provided in the longitudinal direction (that is, the bottom of the lower water tank 23 (that is, It is formed side by side in the width direction of the bottom washing water reservoir 12, and the feed washing water W from the return water channel 20 is allowed to flow out from the plurality of outlets 23 a at the bottom of the tank in a state of being stored in the lower water supply tank 23. Accordingly, the cleaning water W is uniformly supplied in the width direction of the bottom cleaning water reservoir 12 to the upstream end of the bottom cleaning water reservoir 12 (the end opposite to the gap 13). 11 is more uniform in the lateral width direction of the gap 13.

  In short, in the coating booth of the first embodiment, the flow wall 7 is provided with the wall surface 7a on the side of the reservoir portion 12 of the cleaning water W formed by the stop weir 11 as the flow surface of the cleaning water W. A structure is used in which the upper edge of the wall 7 is an overflow weir 8 and the washing water W is supplied to the flow surface 7 a of the flow-down wall 7 by overflow from the overflow weir 8. An upper downstream wall 4 for supplying cleaning water W to the cleaning water reservoir 9 in the form of flowing down along the wall surface is provided, and the cleaning liquid flow lower surface 3a of the upper downstream wall 3 is sprayed from the upper part of the coating work area 1 to the lower part. The spray coating work area 1 is formed above the reservoir 12 in a state where the work area forming wall surface extends.

  Then, with the paint mist-containing air A in the spray coating work area 1 as the gas to be cleaned, the reservoir 12 has a gap 13 between the upper end edge of the stop weir 11 and the lower end edge of the flow-down wall 7 disposed above it. It is set as the structure discharged | emitted from the spray painting work area 1 in the form which passes at high speed from the side.

[Another embodiment]
Next, another embodiment will be listed.

  As shown in FIG. 3, the above-described upper flow wall 3 is omitted, and the lower flow wall 7 (that is, a gap 13 as a gas cleaning throttle air passage between the lower edge of the lower wall and the upper edge of the stop weir 11 is provided. It is also possible to provide only a flow-down wall that forms

  In the painting booth shown in FIG. 3, the upper edge of the flow wall 7 is used as an overflow weir 8, and the overflow from the overflow weir 8 overflows to supply cleaning water W to the flow surface 7 a of the flow wall 7. A water supply basin 25 having a dam 8 as a wall is provided, and the supply washing water W to the water basin 25 overflows and overflows from the weir 8.

  Further, with respect to the reservoir portion 12 formed below the spray painting work area 1 by the stop weir 11, the washing water W is supplied by overflow from the bottom overflow weir 26 disposed on the opposite side of the stop weir 11. A bottom water supply rod 27 having a bottom overflow weir 26 as a dredging wall is provided, and the supply wash water W to the bottom water supply rod 27 overflows from the bottom overflow weir 26.

  Then, the wash water W is supplied to the two water supply basins 25 and 27 from the duct ports 20a and 20b (that is, the outlet of the return water channel 20) disposed in the wash water W in the tubs.

  As shown in FIG. 4, the upper flow wall 3 and the lower flow wall 7 are replaced with the work flow surface forming wall from the upper part to the lower part of the spray work area 1 instead of the washing water flow lower surface 3 a of the upper flow wall 3 as in the above embodiment. Both may be arranged below the spray painting work area 1.

  In addition, in the painting booth shown in FIG. 4, by providing the upper flow-down wall 3, the length of the wash water flow of the lower flow-down wall 7 is shortened, and the washing water splash from the lower edge of the lower flow-down wall 7 is stabilized. In addition, the width of the bottom exhaust path 28 connecting the gap 13 and the exhaust chamber 2 is ensured as large as possible so that maintenance on the bottom exhaust path 28 can be easily performed.

  As shown in FIG. 5, a flow wall 7 is provided as a work area forming wall surface from the upper part to the lower part of the spraying work area 1 by spraying the wall surface as the flow lower surface of the cleaning water W, and is arranged at the lower edge of the flow wall 7 and below the lower wall. The gap 13 between the upper end edge of the stopped weir 11 may be used as a gas cleaning throttle air passage, and the paint mist-containing air A in the painting work area 1 may be passed through the gap 13 at a high speed.

  In addition, in the painting booth shown in each of FIGS. 3 to 5, the same reference numerals as those used in the above-described embodiment are attached to those having the same functions as the devices and members described in the above-described embodiment. is there.

  The gas purification apparatus according to the present invention can be used for cleaning various gases, and the gas to be cleaned is not limited to air, and the object to be removed in the gas is not limited to paint mist, but also dust, oil mist, It may be soot, solvent vapor, gaseous pollutants and the like.

  Further, the cleaning liquid to be used is not limited to water, and various liquids can be used according to the cleaning target gas and the removal target in the gas.

  In the practice of the present invention, the lower end edge of the flow-down wall 7 is disposed above the upper end edge of the stop weir 11 that forms the reservoir 12 of the cleaning liquid W, and the upper end edge of the stop weir 11 and the lower end edge of the flow-down wall 7 In order to form a gap 13 as a gas cleaning throttle air passage in a laterally open state, the specific shapes and structures of the stop weir 11 and the flow-down wall 7 are the shapes and structures shown in the above-described embodiments. Various configuration changes are possible without being limited thereto.

  Further, the structure of the cleaning liquid reservoir 12 formed by the stop weir 11 and the structure for supplying the cleaning liquid to the flow lower surface 7a of the flow-down wall 7 are not limited to the structure shown in the above-described embodiment, and various configurations can be changed. is there.

  In the above-described embodiment, the case where the lower end edge of the flow-down wall 7 is disposed so as to be offset toward the reservoir portion 12 in the horizontal direction with respect to the upper end edge of the stop weir 11 is shown. The lower end edge of the wall 7 is disposed immediately above the upper end edge of the stop weir 11, or the lower end edge of the falling wall 7 is opposite to the reservoir 12 in the horizontal direction relative to the upper end edge of the stop weir 11. You may make it arrange | position to the side.

  In the above-described embodiment, the upper surface of the upper downstream wall 3 that forms the upper overflow weir 4 and the upper edge of the lower downstream wall 7 that forms the lower overflow weir 8 are the lower surfaces of the wash water flow of the upper downstream wall 3. 3a and the wash water lower surface 7a of the lower flow down wall 7 are inclined flow lower surfaces 3s and 7s. Instead of the inclined flow lower surfaces 3s and 7s, the upper end side is separated from the bottom wash water reservoir 12 in the horizontal direction. It may be a bent flow bottom surface.

  The gas purification apparatus according to the present invention can be used for purification of paint mist-containing air generated in a painting facility, and purification of dust-containing gas, oil mist-containing gas, solvent vapor-containing gas, etc. generated in various factories.

Painting booth structure Enlarged view of the main parts Structural drawing of the painting booth showing another embodiment Structural drawing of a painting booth showing another embodiment Structural drawing of a painting booth showing another embodiment Structure of conventional painting booth Structure of other conventional painting booths

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Spray painting work area 3 Upper flow lower wall 7 Flow lower wall 7a Flow lower surface 7s Inclined flow lower surface or bending flow lower surface 8 Overflow weir 9 Overflow cleaning liquid reservoir 11 Stop weir 11a Weir upper surface 12 Reservoir 13 Gap A Cleaning target gas W Cleaning liquid

Claims (7)

A stop weir that forms a reservoir for the cleaning liquid, and a flow-down wall with the wall surface on the side of the reservoir being the lower surface of the cleaning liquid,
With the lower end edge of the flow-down wall positioned above the upper end edge of the stop weir, the stop weir and the flow-down wall are arranged in parallel in a plan view,
The gas cleaning is configured such that the gap between the upper end edge of the stop weir and the lower end edge of the flow-down wall is used as a throttle air passage for gas cleaning, and the cleaning target gas is passed through the gap from the reservoir side at a high speed. apparatus.   2. The gas according to claim 1, wherein a lower end edge of the flow-down wall is arranged so as to be offset toward a side of the reservoir portion relative to the upper end edge of the stop weir in a horizontal direction or toward an opposite side of the reservoir portion. Purification equipment.   The gas purifier according to claim 1 or 2, wherein the stopper weir is provided with an inclined weir upper surface extending obliquely downward from the upper end edge of the stopper weir toward the bottom of the reservoir.   The gas purification apparatus according to any one of claims 1 to 3, wherein an upper end edge of the flow-down wall is used as an overflow weir and a cleaning liquid is supplied to the flow surface by overflow from the overflow weir.   5. The gas purification apparatus according to claim 4, wherein at the upper end edge of the flow-down wall as the overflow weir, the flow lower surface is an inclined flow lower surface or a bent flow lower surface in such a posture that the upper surface is separated from the reservoir in the horizontal direction. .   6. The gas purification apparatus according to claim 4, further comprising an upper flow-down wall that supplies the cleaning liquid to the overflow cleaning liquid reservoir formed by the overflow weir in a form that flows down along the wall surface. A coating booth using the gas purification device according to any one of claims 1 to 6,
In a state where the cleaning liquid flow lower surface of the falling wall or the cleaning liquid flow lower surface of the upper flow falling wall is a work area forming wall surface extending from the upper part to the lower part of the spray coating work area, a spray coating work area is formed above the reservoir part,
A painting booth configured to discharge the paint mist-containing air in the spray painting work area from the spray paint work area in a form of passing through the gap as a cleaning target gas.

Images