JP3615577B2 - Water curtain type painting booth equipment - Google Patents

Description

[0001]
[Industrial application fields]
The present invention relates to a water curtain type painting booth device, and in particular, is widely used for painting automobiles and electrical products, and paint mist released into the air at the time of painting is allowed to flow down into a film along the wall surface. The present invention relates to a so-called water curtain type painting booth apparatus that collects with water.
[0002]
[Prior art]
The water curtain type painting booth device is a painting technique that can efficiently collect paint mist and does not contaminate the inside of the painting booth and the external environment, and is widely used for painting various industrial products.
Conventionally, in order to increase the collection efficiency of paint mist in a water curtain, an air flow from the position of a painting gun or an object to be painted to the water curtain is generated in the painting booth.
[0003]
However, even with such airflow generation means, it is impossible to collect all the paint mist scattered in the painting booth with the water curtain. There is a possibility of leaking outside.
Therefore, a paint mist collecting means is provided in the exhaust passage of the painting booth so that the paint mist that has not been collected by the water curtain can be collected.
[0004]
As a means for collecting paint mist provided in the exhaust passage of the painting booth, for example, a filter made of a porous material is provided in the exhaust passage, or a baffle plate that obstructs the passage of airflow is provided, It has been proposed to provide a shower nozzle in the exhaust path. As the exhaust path of the painting booth, a vertical box-shaped exhaust chamber is usually provided on the back side of the water curtain, and an air flow is sent from the lower end of the water curtain to the exhaust chamber, and the air flow is discharged from the upper end of the exhaust chamber. At the same time, the collecting means provided in the exhaust chamber collects the paint mist in the airflow.
[0005]
[Problems to be solved by the invention]
However, in the conventional water curtain type painting booth apparatus described above, the maintenance management of the paint mist collecting means provided in the exhaust chamber is troublesome and the paint mist collecting efficiency is not sufficient.
As described above, when the paint mist collecting means is provided in the vertical exhaust chamber provided on the back surface of the water curtain, if the paint mist adhering to the paint mist collecting means accumulates, Therefore, it is necessary to take out the paint mist collecting means and remove the attached paint mist. For example, in the case of a filter, it is necessary to replace the filter filler clogged with paint. In the case of baffle plates, it is necessary to remove paint mist adhering to both the front and back surfaces. If a shower nozzle is provided above the baffle plate and the surface of the baffle plate is washed away with water sprayed from the shower nozzle, the paint mist adhering to the surface side of the baffle plate is removed, but the baffle plate Even paint mist adhering to the back side cannot be removed. The shower nozzle cannot be removed if paint mist adheres to the periphery of the nozzle, and the nozzle may be clogged with paint residue. If the paint mist remains attached to the paint mist collecting means, the paint collecting efficiency is lowered, and the paint mist is discharged to the outside.
[0006]
Therefore, in order to remove the paint mist adhering to the paint mist collecting means in the exhaust chamber, it is necessary to disassemble or remove the paint mist by removing the paint mist collecting means or removing the paint mist collecting means. Therefore, it was very troublesome and laborious. Further, since the painting booth apparatus cannot be operated during such disassembly or cleaning work or reassembly work, the operation rate of the entire painting booth apparatus has been reduced.
[0007]
Further, the conventional paint mist collecting means as described above also has a problem that the exhaust air volume is not constant and the paint mist collecting efficiency is not necessarily good. This is because the above-described filter has a sufficient exhaust air volume when a new filter is attached, but the exhaust air volume rapidly decreases as the paint mist accumulates. In the case of a baffle plate, the airflow that flows near the baffle plate loses speed and drops the paint mist, but the airflow that passes away from the baffle plate does not slow down much and drops the paint mist. It will pass without. It is difficult for the shower nozzle to supply a uniform shower of water to the entire exhaust chamber, and the falling water from the shower and the rising airflow cannot be reliably contacted, so that the paint mist in the airflow is sufficiently captured by the water. There were problems such as not being collected.
[0008]
Furthermore, when water-based paint is used in the paint booth device, it is necessary to prevent the paint used so far from being mixed with the next-use paint when the color of the paint is changed. However, if the color of the paint is changed while the paint is still attached to the exhaust passage or the paint mist collecting means, the paint of the previous color is collected in water and mixed with the new color of paint. Therefore, every time the color of the paint is changed, it is necessary to clean the paint mist collecting means and the exhaust passage so that the paint does not remain, which is very troublesome.
[0009]
Therefore, the object of the present invention is to reliably collect the paint mist that has not been collected by the water curtain in the water curtain type painting booth apparatus as described above, and to easily maintain and manage the collecting means therefor. It is to provide a water curtain type painting booth device. Another object is to make it possible to easily change the color of the paint when using the water-based paint as described above.
[0010]
[Means for Solving the Problems]
The water curtain type painting booth apparatus according to the present invention that solves the above-mentioned problems includes a water curtain in the painting booth that causes water to flow down in a film form along the wall surface, and an air flow from the lower end of the water curtain along the back side. In a water curtain type painting booth apparatus having an exhaust passage for discharging, a gas-liquid contact plate having a large number of through portions is provided so as to cross the exhaust passage below the water curtain, and one end of the gas-liquid contact plate Is disposed at a position where water falls from the water curtain, and the exhaust passage is provided separately from a hollow internal exhaust passage extending vertically upward from the gas-liquid contact plate and the internal exhaust passage. An external exhaust passage that communicates with the upper end side of the passage. The upper portion of the internal exhaust passage is provided with a shade-shaped baffle plate that hits the inner surface of the inner exhaust passage. Along with and a water curtain exhaust passage for dropping water in a film shape.
[0011]
The basic structure of the painting booth device can be the same as that of a conventional ordinary painting booth device. For example, the painting booth has a shielding structure that prevents the paint mist generated inside from leaking out to the outside, and is provided with a conveying means for carrying in and out an object to be coated and a painting means such as a spray gun for spraying the paint.
As the basic structure of the water curtain, a conventional ordinary water curtain structure can be adopted. Specifically, it comprises a vertical wall surface and water supply means for flowing water in a film form along the wall surface from the upper part of the wall surface, and a water tank is provided below the water curtain to store the dropped water. . If water is circulated between the water tank and the water supply means, it is possible to prevent the paint mist from accumulating at the bottom of the booth. The water curtain is installed on the wall facing the painting means such as a spray gun across the painting work position where the work is carried and placed in the painting booth, so that the collection efficiency of the paint mist increases. preferable. The amount and flow rate of water flowing through the water curtain vary depending on the area of the water curtain and the coating conditions, but it is usually preferable to flow a water amount of about 50 to 200 l / min per 1 m of the width of the water curtain.
[0012]
In the painting booth, it is preferable to provide an air flow generating means for generating an air flow from a painting work position for painting an object to be coated toward the water curtain.
As the air flow generation means, a blower or exhaust device in a normal mechanical device or the like can be adopted as long as it can generate an air flow from the painting work position toward the water curtain. Specifically, a blower fan or an exhaust blower may be provided in the painting booth or in the ventilation path or exhaust path connected to the painting booth. It is preferable that the airflow distribution in the painting booth is such that a flow velocity of a certain speed or more is generated in the entire area of the painting booth and that the airflow is efficiently generated from the painting work position to the water curtain.
[0013]
As the airflow generation means, an airflow inlet that covers the entire ceiling surface of the painting booth, and a blower duct or a fan that supplies airflow to the airflow inlet can be provided. The airflow inlet over the entire ceiling surface is preferable because it can send the airflow to the entire painting booth and does not obstruct access to the painting booth or work in the painting booth. The speed of the airflow introduced from the airflow inlet on the ceiling surface varies depending on conditions such as the internal structure of the painting booth, but it is usually preferable to set it to about 0.2 to 0.6 m / sec.
[0014]
The exhaust path is provided along the back side from the lower end of the water curtain, and the airflow flowing in from the lower end of the water curtain passes through the exhaust path and is discharged to the outside from the exhaust port provided at the end of the exhaust path. If an exhaust fan is provided in the middle of the exhaust passage, airflow can be discharged efficiently. This exhaust fan is also one of the airflow generating means. The gas-liquid contact plate is formed by distributing a large number of penetrating portions like a punching metal having a large number of through holes in a thin metal plate. The shape of the penetrating part may be a simple circular shape, an arbitrary polygonal shape, a slit shape, or a different shape combining straight lines and curves. The penetrating portion only needs to have a size that allows water to pass from one side to the other side and, at the same time, air flow from the other side to one side. What is necessary is just to distribute and arrange so that it can pass favorably. Specific dimensions and arrangement of the penetrating portion can be freely set in accordance with the entire painting booth device or the structure of the water curtain. Under normal setting conditions, it is preferable to set the area of the penetrating portion in the total area of the gas-liquid contact plate, that is, the aperture ratio, to about 30 to 70%. In addition, the dimension and arrangement structure of the gas-liquid contact plate penetration are set so that the wind speed of the airflow passing through the gas-liquid contact plate penetration is about 1.0 to 4.0 m / sec. More preferably, the wind speed is set to about 3.0 m / sec.
[0015]
The gas-liquid contact plate is disposed below the water curtain, that is, at the lower end of the exhaust passage so as to cross almost the entire cross section of the exhaust passage. The air flow in the painting booth is not allowed to enter the exhaust path unless it substantially passes through the gas-liquid contact plate, except for a gap with the water curtain described later.
One end of the gas-liquid contact plate is placed at a position where water falls from the water curtain. That is, it is only necessary that the end of the gas-liquid contact plate be arranged at a position slightly below the vertical wall of the water curtain and slightly into the center of the painting booth. As a result, the water falling on the water curtain flows down to the upper surface of the gas-liquid contact plate. If the gas-liquid contact plate has a slope that decreases from the lower side of the water curtain to the far side of the water curtain, the water that has dropped on the upper surface of the gas-liquid contact plate can be smoothly moved to the far position of the gas-liquid contact plate. It can flow.
[0016]
It is preferable to leave a gap that allows water to fall between the lower end of the water curtain and the gas-liquid contact plate. If this gap is too large, the ratio of the airflow passing through the through-hole of the gas-liquid contact plate is reduced, so that the effects of the present invention cannot be fully exerted, and if the gap is too small, the airflow in this gap portion It becomes difficult to make contact with water, which is not preferable. Therefore, the size of the gap varies depending on conditions such as the flow rate of water flowing through the water curtain and the amount of airflow, but it is usually preferably set to about 5 to 60 mm, preferably about 20 mm.
[0017]
The exhaust path includes a hollow internal exhaust path that extends vertically upward from the gas-liquid contact plate, and an external exhaust path that is provided separately from the internal exhaust path and communicates with the upper end side of the internal exhaust path.
By sufficiently taking the area of the internal exhaust path and setting the wind speed in the internal exhaust path to 1.0 to 1.5 m / sec, water droplets contained in the airflow that has passed through the gas-liquid contact plate lose the flow velocity and fall To do. In this case, it is not necessary to provide paint mist collecting means having a complicated structure in the internal exhaust passage. However, since paint mist may adhere to the wall surface of the internal exhaust passage, a water curtain is provided in the internal exhaust passage in order to solve this problem. In addition to the water curtain, a paint mist collecting means such as a shower nozzle having a relatively simple structure can be provided in the internal exhaust passage.
[0018]
The structure of the water curtain provided in the internal exhaust path is the same as the structure of the water curtain provided in the coating booth. As the water curtain for the exhaust passage, one having a curtain flow rate of 50 to 100 l / min is used.
At the upper part of the internal exhaust path, a shade-shaped baffle plate is provided in which airflow hits the inner side surface. The shade-shaped baffle plate has a cylindrical shade shape whose lower side extends to the outer peripheral side, and is provided at a position and shape where the airflow passing from the internal exhaust path to the external exhaust path is satisfactorily hit.
[0019]
The external exhaust path is provided separately from the internal exhaust path. The internal exhaust path and the external exhaust path are arranged in communication with each other at the upper end side of the internal exhaust path extending vertically upward from the gas-liquid contact plate. The basic shape and structure of the external exhaust path are the same as the shape and structure of the exhaust path in a normal painting booth device.
The external exhaust path can be provided with a mist collecting means for collecting paint mist in the exhaust and a forced exhaust means for forcibly discharging the exhaust. As the mist collecting means, a mist collecting means provided in a normal exhaust path such as a filter, a baffle plate, or a shower nozzle is used. The forced exhaust means may be a normal exhaust means such as a fan or blower.
[0020]
The paint booth further includes a water collecting means for collecting water falling from the water curtain and the gas-liquid contact plate below the water curtain and the gas-liquid contact plate, and circulates and supplies the water collected by the water collecting means to the water curtain. It is possible to further provide water circulation means.
The water recovery means includes a water receiving tank that collects the water dropped on the bottom surface of the painting booth and a water storage tank that stores the water accumulated in the water receiving tank.
[0021]
The paint contained in the water recovered by the water recovery means can be recovered and reused by concentrating it with a concentrating device when the concentration of the paint reaches a certain concentration.
The coating booth may be a coating booth for water-based paint that uses water-based paint for painting. As the water-based paint, usual water-based paints used for coating various products are used.
[0022]
[Action]
The paint mist generated at the painting work position is sent to the water curtain together with the air current, and is collected in the film-like water flowing down the water curtain. However, the airflow including the paint mist that has not been collected by the water curtain is sent to the exhaust path from below the water curtain. The water flowing down the water curtain falls downward from the lower end of the water curtain. Since the gas-liquid contact plate exists below the water curtain, water falls on the upper surface of the gas-liquid contact plate. Water falls in the form of a film or water droplets and falls, covering the gap between the water curtain and the gas-liquid contact plate. The water dropped on the upper surface of the gas-liquid contact plate sequentially falls downward from a large number of through portions provided in the gas-liquid contact plate while flowing along the gas-liquid contact plate.
[0023]
Of the airflow discharged from the bottom of the water curtain to the exhaust passage, the airflow that tries to pass through the gap between the water curtain and the gas-liquid contact plate comes into contact with the falling water film or water droplets, and the paint in the airflow Mist will be collected in the water. The gap between the water curtain and the gas-liquid contact plate is narrow, and a large amount of water falls there. Therefore, the contact rate between the air current and water is extremely high, and the paint mist collecting efficiency is good. In addition, when the airflow trying to enter the upper exhaust passage from the lower side of the gas-liquid contact plate through the through-hole provided in the gas-liquid contact plate comes into contact with the water droplets falling through the through-hole or through the narrow through-hole, In addition, the airflow comes into contact with water that flows in the opposite direction and falls, so that the airflow comes into contact with water reliably and efficiently. In each of a large number of through portions provided in the gas-liquid contact plate, the airflow and water are brought into contact with each other, so that the paint collection efficiency is very high. In particular, in the space below the gas-liquid contact plate, water has fallen over the entire surface, so that the airflow passing through this space is in contact with water for a sufficient amount of time to collect paint mist. become.
[0024]
As a result, the amount of paint mist contained in the airflow passing through the gap between the water curtain and the gas-liquid contact plate or through the gas-liquid contact plate and entering the exhaust passage is greatly reduced. It is not necessary to provide a paint collecting means having a complicated structure as in the prior art inside the passage.
In the gas-liquid contact plate serving as the paint mist collecting means in the present invention, since water constantly flows from the upper surface side to the penetrating portion, there is no fear that the paint mist adheres or the paint is clogged. The lower side of the gas-liquid contact plate is installed not in the narrow exhaust passage, but in the open space on the wide side of the painting booth, so that the paint mist adhering to the lower side can be washed or removed. This operation can be easily performed without removing the gas-liquid contact plate. Even when it is necessary to remove the gas-liquid contact plate, the removal operation can be easily performed in a wide space.
[0025]
Note that paint mist contained in the airflow that has passed through the gas-liquid contact plate loses its flow velocity and falls by passing through an exhaust passage that is sufficiently wide for the passage of airflow, so special paint mist collection means should be provided. Even if not, the paint mist naturally falls from the airflow passing through the exhaust passage and falls onto the upper surface of the gas-liquid contact plate, and finally collected in the circulating water.
[0026]
However, the paint mist contained in the airflow may adhere to the wall surface of the exhaust passage. It is very troublesome to remove the paint adhering to the wall surface of the exhaust passage. Further, even a relatively small amount of paint mist may pass through the exhaust passage and adhere to an exhaust fan or the like. Therefore, it is necessary to configure the exhaust path by the above-described internal exhaust path and the external exhaust path, and to provide a cap-shaped baffle plate and a water curtain in the internal exhaust path.
[0027]
If there is a water curtain on the side wall of the internal exhaust passage, the problem that the paint adheres to the side wall is solved. Further, since the paint mist containing the paint mist comes into contact with the shade-shaped baffle plate and the paint mist in the airflow falls at a speed, it is possible to prevent the paint mist from passing to the external exhaust path side. Even if the paint mist adheres to the cap-shaped baffle plate, it is easy to remove the cap-shaped baffle plate and remove or wash the paint.
[0028]
In the apparatus of the present invention, even when it is necessary to provide the paint mist collecting means in the exhaust passage, the paint mist contained in the airflow in the exhaust passage is very small. As a result, the amount of paint mist adhering to the coating can be reduced, and the interval between the cleaning operation and the replacement operation of the paint mist collecting means can be greatly extended as compared with the conventional painting booth device. Since the entire painting booth system will also undergo periodic inspections and repair work after a certain period of operation, if the paint mist repair means in the exhaust passage is cleaned or replaced at such an opportunity, the paint mist There is little reduction in the operating rate of the entire painting booth system just for maintenance management of repair means.
[0029]
In addition, if the exhaust path includes the above-described internal exhaust path and external exhaust path, the color change operation of the paint can be efficiently performed when configuring a water-based paint recycling collection system. That is, when changing the color of the paint, it is necessary to sufficiently remove the paint used last time, which adheres to or remains in the paint booth and the internal exhaust passage, using a water curtain or a shower nozzle. The external exhaust passage may be left with the paint used last time. This is because the paint remaining in the internal exhaust path above the gas-liquid contact plate may fall during painting or cleaning operations and mix with the recovered water from the water curtain. It is necessary to remove enough. However, since the external exhaust passage is only in communication with the upper end side of the internal exhaust passage, the paint that remains or adheres to the external exhaust passage does not return to the internal exhaust passage side.
[0030]
Furthermore, even if there is a trace amount of paint mist that could not be collected by the gas-liquid contact plate, the water curtain of the internal exhaust passage, and the shade-shaped baffle plate, if the mist collection means is provided in the external exhaust passage, it is surely captured. I can gather. Since paint mist does not adhere to forced exhaust means such as an exhaust fan provided in the external exhaust path, the performance of the exhaust fan can be satisfactorily exhibited over a long period of time.
[0031]
In this way, if the gas-liquid contact plate, water curtain, and shade-shaped baffle plate perform well in the internal exhaust passage and the paint mist contained in the airflow can be finally removed in the external exhaust passage, The mist can be reliably prevented from being discharged to the external environment, and when changing the paint color, the paint is removed or washed only by the internal exhaust passage, which is relatively easy to remove or wash the paint. Therefore, the color change work can be performed efficiently.
[0032]
In the above description, the color changing operation means not only the case of using a paint having a different color as a paint but also the case of replacing the paint with the same color but having a different material and characteristics.
If the painting booth is further equipped with water recovery means and water circulation means as described above, the water used in the painting booth can be used effectively to eliminate waste of water resources and to contaminate the external environment with paints, etc. It is possible to contribute to environmental protection by preventing a large amount of discharged water from being released.
[0033]
If the paint booth is a paint booth for water-based paints, the paint contained in the water collected by the mist collecting means such as a water curtain can be easily used for painting again. Can be effective.
[0034]
【Example】
Next, embodiments of the present invention will be described below with reference to the drawings.
FIG. 1 shows the overall structure of the painting booth apparatus.
In the painting booth 10, conveying means such as a hanger conveyor 12 for taking in and out the article W to be coated, a spray gun 14 for spraying the paint on the article W to be coated, and a painting means such as a paint supply pipe 15 for supplying the paint to the spray gun 14. Is provided. The painting booth 10 is provided with an air flow inlet 18 provided with an air filter 17 so as to open over the entire ceiling surface. An air duct 16 is installed on the back surface of the air flow inlet 18 and air is sent from a blower blower or the like.
[0035]
A water curtain 20 is provided on a wall surface facing the spray gun 14 with the workpiece W interposed therebetween. The water curtain 20 includes a water tank 22 at the upper end thereof, and the water accumulated in the water tank 22 flows down in a film form along the vertical wall surface of the water curtain 20 through the gap at the lower end. Above the water reservoir 22, a water supply port 23 connected to the pipe 26 is opened. The bottom surface of the painting booth 10 is a water receiving tank 11, and water dropped from the water curtain 20 or the like is collected in the water receiving tank 11. The water receiving tank 11 is connected to the water storage tank 50 through the return tank 13, and the water accumulated in the water receiving tank 11 is sent to the water storage tank 50.
[0036]
A pipe 26 leading to the water reservoir 22 is connected to the water storage tank 50, and a pump 28 and valves 24 and 29 are attached to the middle of the pipe 26. Therefore, water is supplied from the water tank 50 to the pipe 26, the water tank 22, and the water curtain 20, and the water that has flowed down the water curtain 20 is returned to the water tank 50 from the water receiving tank 11 to repeat the process. The paint mist is collected while circulating. The water in which the concentration of the collected paint mist is increased is recovered and discarded, or is reused after removing the paint mist with a filtration device as necessary.
[0037]
An exhaust chamber 30 serving as an internal exhaust path is provided on the back side of the water curtain 20. The exhaust chamber 30 has a vertical hollow box shape, and the upper end side is connected to a descending exhaust cylinder 35 constituting an external exhaust path.
A cap-shaped baffle plate 70 having a cylindrical shape extending downward is provided at the upper portion of the exhaust chamber 30. There are gaps between the outer periphery of the cap-shaped baffle plate 70 and the side wall of the exhaust chamber 30, and between the upper end of the cap-shaped baffle plate 70 and the ceiling wall of the exhaust chamber 30.
[0038]
A plurality of water supply ports 83 are arranged along the circumferential direction in the space between the upper part of the shade-shaped baffle plate 70 and the side wall of the exhaust chamber 30. Each water supply port 83 is connected to a pipe branched from the pipe 26. A valve 84 is attached to a branch pipe to each water supply port 83.
When water is discharged from the water supply port 83, it collects in the space between the outer periphery of the cap-shaped baffle plate 70 and the side wall of the exhaust chamber 30, passes through the gap between the cap-shaped baffle plate 70 and the side wall of the exhaust chamber 30, A water curtain 80 is formed by flowing down in the form of a film along the side wall of the exhaust chamber 30. The water curtain 80 is formed over the entire circumference of the side wall of the exhaust chamber 30. The water flowing down the water curtain 80 enters the water receiving tank 11.
[0039]
As shown in FIG. 2, the descending exhaust cylinder 35 is provided at two locations on both sides of the exhaust chamber 30. The left and right descending exhaust cylinders 35 are open at the bottom to one external collection chamber 36 at the center. A rising exhaust pipe 34 extending vertically upward is provided at the center of the external recovery chamber 36. A drainage pipe 361 is provided at the bottom of the external recovery chamber 36. Near the lower end of the rising exhaust cylinder 34, an eliminator 37 made up of a number of baffle plates is provided. An exhaust fan 32 is attached near the upper end of the rising exhaust cylinder 34.
[0040]
A gas-liquid contact plate 40 is installed below the exhaust chamber 30 and slightly below the lower end of the water curtain 20. The gas-liquid contact plate 40 is made of punching metal, and moves from the position in contact with the rear wall of the exhaust chamber 30 on the left side of the drawing toward the right side toward the accommodation space side of the object W to be coated from the lower end of the water curtain 20. It is arranged so as to cross almost horizontally until it reaches a little. The gap 21 between the gas-liquid contact plate 40 and the lower end of the water curtain 20 is set such that the distance h is about 20 mm. The gas-liquid contact plate 40 is bent 44 at the end on the water curtain 20 side in an upward vertical direction, and is inclined so as to become lower toward the back side of the exhaust chamber 30. As will be described in detail in FIG. 3, the gas-liquid contact plate 40 has a through hole 42 formed over the entire surface.
[0041]
The water that has flowed down the water curtain 20 falls onto the upper surface of the gas-liquid contact plate 40, spreads over the upper surface of the gas-liquid contact plate 40, passes through the through hole 42, and falls into the lower water receiving tank 11. . Due to the bent portion 44 and the inclination of the gas-liquid contact plate 40, the water that has flowed down the water curtain 20 flows reliably over the entire upper surface of the gas-liquid contact plate 40.
[0042]
The operation of the coating booth apparatus having the above structure will be described.
The airflow introduced into the painting booth 10 from the gas-liquid inlet 18 passes through the painting work position with respect to the article W to be coated, and includes paint mist that has not adhered to the article W. Part of the paint mist that has not adhered to the workpiece W falls directly into the water receiving tank 11 on the bottom of the painting booth 10. The airflow flows toward the water curtain 20, contacts the water film flowing down the water curtain 20, and the paint mist contained in the airflow is collected in the water. The airflow that has flowed along the water curtain 20 passes through the gap 21 between the lower end of the water curtain 20 and the gas-liquid contact plate 40 and the through-hole 42 of the gas-liquid contact plate 40 below, and enters the exhaust chamber 30. Flows in. At this time, the suction action by the exhaust fan 32 also works synergistically.
[0043]
In the gap 21 between the water curtain 20 and the gas-liquid contact plate 40, the air flow and the water flow or water droplets of the falling water come into contact with each other, and the paint mist contained in the air flow is collected in the water. Even in the through hole 42 of the gas-liquid contact plate 40, the water falling from the top to the bottom through the through hole 42 and the air flow passing through the through hole 42 from the bottom to the top contact each other. To be collected. Further, in the lower space of the gas-liquid contact plate 40, each water flow or water droplet falling from the many through holes 42 comes into contact with the air flow passing therebetween, so that the paint mist in the air flow is also collected by the water. .
[0044]
By these actions, the paint mist in the airflow is collected in water, and the water in which the paint mist is collected is finally returned from the water receiving tank 11 to the water storage tank 50. The airflow passing through the gap between the water curtain 20 and the gas-liquid contact plate 40 and the through-hole 42 of the gas-liquid contact plate 40 and from which the paint mist has been sufficiently removed is lowered from the exhaust chamber 30 to the descending exhaust cylinder 35 as an external exhaust path, It is discharged to the outside through the external recovery chamber 36 and the rising exhaust pipe 34.
[0045]
Since the exhaust chamber 30 includes the water curtain 80, even if paint mist is included in the airflow passing through the exhaust chamber 30, it does not adhere to the side wall of the exhaust chamber 30. Since water always flows on the upper surface of the gas-liquid contact plate 40, there is no fear that the paint mist adheres. The coating mist does not adhere to the through-hole 42 of the gas-liquid contact plate 40 as long as a sufficient amount of water has passed. On the lower surface of the gas-liquid contact plate 40, if the paint mist in the airflow is sufficiently collected by the flow of water dropped through the through hole 42, the paint mist may adhere to the lower surface of the gas-liquid contact plate 40. There are few.
[0046]
Even if paint mist adheres to the gas-liquid contact plate 40, the gas-liquid contact plate 40 is attached to an open place on the painting work space side of the painting booth 10, so that the work that has entered the painting booth 10 is performed. A person can easily perform the operation of cleaning the gas-liquid contact plate 40 or replacing the gas-liquid contact plate 40.
Since the cap-shaped baffle plate 70 is provided at the upper part of the exhaust chamber 30, when the airflow passing through the exhaust chamber 30 hits the cap-shaped baffle plate 70, the paint mist contained in the airflow falls and the gas-liquid contact plate 40 It is sent to the water receiving tank 11 from above.
[0047]
Therefore, the airflow sent from the exhaust chamber 30 to the external exhaust path has almost no paint mist or a trace amount of paint mist. Since the trace amount of paint mist contained in the airflow is further removed by the eliminator 37, the paint mist is almost completely removed from the exhaust discharged outside through the exhaust fan 32 of the ascending exhaust cylinder 34. The paint removed from the airflow by the eliminator 37 is taken out from the drainage pipe 361 and discarded. As described above, since the paint mist in the airflow is efficiently removed by the gas-liquid contact plate 40 or the like, the amount of drainage liquid removed by the eliminator 37 and discharged from the drainage pipe 361 is small.
[0048]
Since the water collected in the water storage tank 50 contains a considerable amount of paint, if the collected water that has reached a certain concentration is concentrated by a separate concentrator and collected, the collected paint can be used for painting again. Can do. The water separated by the concentrator is returned to the painting booth as clean water.
Next, the color change work will be described.
[0049]
When performing the color changing work, after the painting work is finished, the paint remaining in the painting booth 10 is removed or washed using the water curtain 20 or the spray nozzle 25 or the like. The water recovered in the water storage tank 50 by this cleaning operation is discarded or recycled by separating the paint with a filtration device.
After that, if a new color paint is supplied to the paint supply pipe 15 and sprayed from the spray gun 14, a painting operation using the new color paint can be performed. At this time, in the external exhaust path ahead of the descending exhaust cylinder 35, there is a possibility that a newly used paint may be mixed with the previously used paint. However, the paint existing in the external exhaust path is on the exhaust chamber 30 or the painting booth 10 side. The paint color does not mix even if water and paint are recycled in the painting work after the color change.
[0050]
【The invention's effect】
As described above, the water curtain type painting booth device according to the present invention is configured such that the water and the exhaust falling from the water curtain by the action of the gas-liquid contact plate provided so as to cross the exhaust path below the water curtain. The airflow discharged to the road can be contacted very efficiently, and the paint mist contained in the airflow can be reliably collected in the falling water. Since the gas-liquid contact plate is installed open to the wide space in the painting booth below the exhaust passage, even if paint mist adheres to the gas-liquid contact plate and accumulates, the gas-liquid contact plate is washed. The work of removing paint mist can be performed easily.
[0051]
As a result, the paint mist contained in the airflow passing through the exhaust passage is remarkably reduced, and there is no need to provide a complicated paint mist collecting means in the exhaust passage.
If it is not necessary to provide complicated paint mist collecting means in the exhaust passage, disassemble the internal structure of the exhaust passage, remove the paint mist collecting means with complicated structure and clean the paint mist There is no need for replacement or the like, and the interruption of the painting work required for such work is eliminated. As a result, the operating rate of the entire painting booth device can be improved, and the operating cost of the entire painting process can be reduced.
[0052]
In addition, since the exhaust path includes the above-described internal exhaust path and external exhaust path, the color change operation of the paint can be performed efficiently, and the paint mist contained in the exhaust can be reliably removed.
Since the water curtain is provided in the internal exhaust path, it is possible to reliably prevent the paint from adhering to the side wall of the internal exhaust path.
[0053]
Since the cap-shaped baffle plate is provided in the internal exhaust path, it is possible to satisfactorily prevent the paint mist from being sent to the external exhaust path together with the air flow. As a result, the paint mist is hardly contained in the airflow sent to the external exhaust path, and the paint does not adhere to the wall surface of the external exhaust path or the exhaust fan.
If the painting booth is further provided with water recovery means and water circulation means as described above, it can greatly contribute to the effective use of water resources and environmental protection.
[0054]
If the painting booth is a coating booth for water-based paints, the above-described effective use of water and paint and the effect of environmental protection can be effectively exhibited.
[Brief description of the drawings]
FIG. 1 is an overall structural diagram of a painting booth device representing an embodiment of the present invention.
FIG. 2 is a front view of an external exhaust passage portion viewed from a direction orthogonal to FIG.
FIG. 3 is an enlarged plan view showing a detailed structure of a gas-liquid contact plate
[Explanation of symbols]
10 Painting booth
14 Spray gun
16 Air duct
18 Airflow inlet
20 Water curtain
21 Clearance
30 Exhaust chamber (internal exhaust path)
32 Exhaust fan
34 Ascending stack (external exhaust path)
35 Lowering exhaust pipe (external exhaust passage)
36 External collection room
37 Eliminator
40 Gas-liquid contact plate
42 Through hole
50 water tank
70 Shade-shaped baffle
80 Water curtain for exhaust passage
W Workpiece

Claims (4)

Many penetrations in a water curtain type painting booth device with a water curtain that allows water to flow in a film form along the wall surface and an exhaust passage that discharges airflow from the lower end of the water curtain along the back side in the painting booth A gas-liquid contact plate having a section is provided so as to cross the exhaust path below the water curtain, and one end of the gas-liquid contact plate is disposed at a position where water falls from the water curtain, and the exhaust path Is composed of a hollow internal exhaust passage extending vertically upward from the gas-liquid contact plate and an external exhaust passage provided separately from the internal exhaust passage and communicating with the upper side of the internal exhaust passage. The upper part is provided with a shade-shaped baffle plate that the airflow hits on the inner side surface, and the side wall of the internal exhaust path is provided with an exhaust path water curtain for dropping water into a film along the wall surface. Water curtain paint booth apparatus according to symptoms. The water curtain type painting booth device according to claim 1, wherein the external exhaust path includes mist collecting means for collecting paint mist in the exhaust and forced exhaust means for forcibly discharging the exhaust. The paint booth further includes a water collecting means for collecting water falling from the water curtain and the gas-liquid contact plate below the water curtain and the gas-liquid contact plate, and circulates and supplies the water collected by the water collecting means to the water curtain. The water curtain type painting booth apparatus according to claim 1, further comprising a water circulation means for performing the operation. The water curtain type painting booth apparatus according to any one of claims 1 to 3, wherein the painting booth is a painting booth for water-based paint using a water-based paint for painting.

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