JP2005131473A - Exhaust treatment apparatus for coating booth with air supply - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide the exhaust treatment apparatus for a coating booth with air supply capable of preventing not only the contamination of the base of an exhaust chamber but also the lowering of the collection efficiency of coating mist caused by the occurrence of foam. <P>SOLUTION: This exhaust treatment apparatus 11 is constituted so as not only to suck the polluted air in a coating chamber 3 into the exhaust chamber 12 but also to perform dropletting of the water allowed to fall into the exhaust chamber 12 while bringing coating mist contained in the polluted air into contact with water droplets to collect the same. The base 12a of the exhaust chamber 12 is formed as an inclined surface becoming low toward an exhaust duct 13 from a narrow flow channel 17 and a gas-liquid separation plate 20 for separating moisture from the air passed through the narrow flow channel 17 is arranged between the narrow flow channel 17 and the exhaust duct 13. A drain passage 21 for storing water capturing the coating mist is arranged at the lower position on the downstream side of the gas-liquid separation plate 20. <P>COPYRIGHT: (C)2005,JPO&NCIPI

Description

  The present invention sucks contaminated air from a painting chamber into the exhaust chamber, atomizes the liquid dropped into the exhaust chamber, and collects the coating mist contained in the contaminated air in gas-liquid contact with the atomized liquid. The present invention relates to an exhaust treatment device of a care painting booth.

  In general, when an object to be coated is painted at a painting booth, contaminated air containing paint mist, volatile organic solvent, or the like is filled in the painting chamber due to overspray. As a result, the quality of the object to be coated may be impaired by the fogging of the paint mist, and the health of the worker may be harmed by the volatile organic solvent. In order to solve these problems, a paint booth with air supply for discharging contaminated air outside the painting chamber has been proposed.

  However, from the viewpoint of pollution prevention, the contaminated air in the painting chamber cannot be released into the atmosphere as it is. For this reason, an exhaust treatment device that purifies contaminated air is provided in a paint booth with air supply (see, for example, Patent Document 1). The exhaust treatment device sucks contaminated air in the painting chamber into the exhaust chamber and atomizes water dropped into the exhaust chamber by a throttle air passage (liquid atomization unit). Then, the paint mist contained in the contaminated air is collected by bringing it into gas-liquid contact with a water droplet.

  And most of the water droplets which collected the paint mist fall into the return water tank (drainage storage part) from the opening part of a throttle air path. Also, some of the water droplets containing paint mist are guided to the exhaust duct side, but contact the draining device (gas-liquid separation means) and fall to the bottom of the exhaust chamber, and only the air component is guided to the exhaust duct side. .

Japanese Patent No. 3076426 (FIG. 1)

  However, in the painting booth with air supply shown in Patent Document 1, a large amount of bubbles are generated in the return water tank due to drops of water falling into the return water tank, and the generated bubbles may overflow from the return water tank. In this case, the overflowing foam is guided to the draining device by the air flow, passes through the draining device, and is discharged to the outside from the exhaust duct. Therefore, there is a problem that the collection efficiency of the paint mist in the drainer is lowered.

  Further, the area immediately below the draining device on the bottom surface of the exhaust chamber is soiled by the paint mist collected in the water droplets and the bubbles dripping from the draining device. Therefore, there is a problem that the burden of cleaning during maintenance increases.

  In order to prevent this, it is conceivable to deepen the return water tank. However, from the viewpoint of avoiding an increase in the size of the painting booth, it is desirable that the return water tank be as shallow as possible.

  The present invention has been made in view of the above problems, and the object thereof is to prevent the bottom surface of the exhaust chamber from being contaminated, and to prevent a decrease in the collection efficiency of the paint mist due to the generation of bubbles. The object is to provide an exhaust treatment device for a paint booth with air supply.

  In order to solve the above-mentioned problem, in the invention according to claim 1, the paint mist contained in the contaminated air is obtained by sucking the contaminated air in the coating chamber into the exhaust chamber and atomizing the liquid dropped into the exhaust chamber. In an exhaust treatment apparatus of a paint booth with air supply that collects gas in contact with the atomized liquid, the exhaust chamber generates a atomized liquid and a flow plate having an opening through which contaminated air passes along with the liquid A liquid atomization unit; a gas-liquid separation unit that separates a liquid component from the air that has passed through the liquid atomization unit; and an air that is provided on one side wall of the exhaust chamber and that has passed through the gas-liquid separation unit An exhaust duct for discharging and a drainage reservoir for storing liquid that has collected the paint mist are collected, and the bottom surface of the exhaust chamber is an inclined surface that becomes lower from the liquid atomization section side toward the exhaust duct side. The gas-liquid separation means is disposed between the liquid atomization portion and the exhaust duct, and the exhaust is disposed at a position directly below the gas-liquid separation means or at a lower position downstream of the gas-liquid separation means. The gist of the exhaust treatment device of a paint booth with air supply, in which a liquid storage section is arranged.

  Therefore, according to the first aspect of the present invention, since the drainage reservoir is not arranged on the upstream side of the gas-liquid separation means, it is difficult to generate bubbles on the upstream side of the gas-liquid separation means. Even so, it will not grow significantly. Therefore, it is possible to prevent a decrease in the collection efficiency of the paint mist due to the generation of bubbles.

  In addition, the bottom surface of the exhaust chamber is an inclined surface that becomes lower from the liquid atomization portion side toward the exhaust duct side. Therefore, the liquid guided from the liquid atomization unit to the bottom surface of the exhaust chamber is not limited to the bottom surface but is guided to the drainage storage unit on the downstream side of the liquid atomization unit. Therefore, since the bottom surface of the exhaust chamber is washed away, it is possible to prevent the bottom surface of the exhaust chamber from becoming dirty, and the cleaning burden during maintenance can be reduced.

  Moreover, since it is not necessary to deepen the drainage reservoir in order to prevent the generation of bubbles, it is possible to prevent the painting booth with air supply from being enlarged in the vertical direction.

  Here, examples of the “liquid atomization portion” include a venturi-like cylindrical body, and the like, but a narrow channel formed between the tip of the guide means provided below the flow plate and the side wall. (Claim 2).

  The “drainage reservoir” is not only a tank or a tray that can store liquid for a long period of time, but also a drainage groove or the like before the liquid is discharged to the outside. It also includes things that accumulate.

  According to a second aspect of the present invention, in the first aspect, the contaminated air and liquid that have passed through the opening are located below the flow plate on the opposite side of the side wall where the exhaust duct is provided in the exhaust chamber. The gist of the present invention is that a guide means is provided near the lower end of the side wall, and a narrow flow path is formed between the tip of the guide means and the side wall.

  Therefore, according to the second aspect of the present invention, it is possible to use the side wall on the opposite side of the side wall where the exhaust duct is provided in the exhaust chamber without particularly forming a tubular body having a venturi shape. A narrow channel can be easily formed.

  Further, by disposing the front end of the guide plate in the vicinity of the lower end of the side wall, it is possible to increase the volume of the space configured by the flow plate and the guide plate and reducing noise by causing sound interference. Therefore, noise can be effectively reduced.

  The “narrow channel” is preferably formed so narrow that the flow of air and liquid does not stagnate. In this way, the flow velocity of the air and the liquid flowing through the narrow channel is increased, so that the atomization of the liquid is promoted.

  The gist of the invention of claim 3 is that, in claim 1 or 2, the cross-sectional area of the flow path gradually increases from the liquid atomization portion side toward the exhaust duct side.

  Therefore, according to the third aspect of the present invention, since the flow velocity of the air gradually decreases toward the exhaust duct, the atomized liquid flowing together with the air easily falls to the bottom surface of the exhaust chamber. Therefore, the liquid component can be more reliably separated from the air that has passed through the liquid atomization portion.

  As described in detail above, according to the first to third aspects of the invention, the bottom surface of the exhaust chamber can be prevented from being contaminated, and the decrease in the efficiency of collecting the paint mist due to the generation of bubbles can be prevented. .

  Hereinafter, an embodiment of the present invention will be described in detail with reference to FIG. FIG. 1 is a front sectional view showing a supply booth with air supply in the present embodiment.

  As shown in FIG. 1, the supplied paint booth 1 is for forming a coating film on the surface of the article 2 by spraying the paint onto the article 2 such as an automobile body. Above the painting chamber 3 constituting the main part of the painting booth with air supply 1, there is provided an air supply chamber 4 for supplying the downflow A1 that flows uniformly without disturbing the air into the painting chamber 3. An exhaust chamber 12 that constitutes a main part of the exhaust treatment device 11 is provided below the coating chamber 3.

  The exhaust chamber 12 sucks contaminated air in the painting chamber 3 by a suction force of an exhaust fan (not shown). The contaminated air contains paint mist that is oversprayed from a painting machine (not shown) in the painting chamber 3. In addition, an exhaust duct 13 that exhausts air purified in the exhaust chamber 12 to the outside is provided on one side wall 12 b of the exhaust chamber 12. Then, the air discharged from the exhaust duct 13 is pumped by a fan (not shown) and is led to the air supply chamber 4 again.

  As shown in FIG. 1, a flow plate 14 is disposed in the exhaust chamber 12 so as to partition the exhaust chamber 12 up and down. The flow plate 14 is inclined so as to descend toward the center, and includes water supply pipes 14a and 14b as water supply means on both the left and right sides. A plurality of pipes are provided at equal intervals in the water supply pipes 14a and 14b. Therefore, the water (liquid) in the water supply pipes 14a and 14b overflows from the upper end of each pipe and flows on the flow plate 14 toward the center. An opening 15 through which contaminated air passes with water is formed at the center of the flow plate 14. In addition, it may replace with the above water supply pipes 14a and 14b, and may use a water tank as a water supply means.

  A guide plate 16 as a guide means is provided below the flow plate 14. The guide plate 16 extends from the lower end portion of the opening 15 toward the lower left in FIG. The guide plate 16 forms a flow path from the opening 15 to the vicinity of the bottom surface 12 a of the exhaust chamber 12. Therefore, the guide plate 16 guides the contaminated air that has passed through the opening 15 and the water dropped from the opening 15 to the bottom surface 12 a of the exhaust chamber 12.

  As shown in FIG. 1, the front end of the guide plate 16 is disposed close to the vicinity of the lower end of the side wall 12 c on the opposite side of the side wall 12 b where the exhaust duct 13 is provided in the exhaust chamber 12. Thereby, a narrow channel 17 as a liquid atomization portion is formed between the tip of the guide plate 16 and the side wall 12c. The narrow flow path 17 is the narrowest flow path from the opening 15 to the exhaust duct 13. Therefore, when passing through the narrow channel 17, the flow velocity of air and water is maximized and water is atomized. At this time, the paint mist contained in the contaminated air is collected in gas-liquid contact with water droplets (atomized liquid). Then, most of the water droplets that have collected the paint mist are guided from the opening of the narrow channel 17 to the bottom surface 12 a of the exhaust chamber 12. A part of the water droplets including the paint mist is guided to the exhaust duct 13 side.

  As shown in FIG. 1, a silencer chamber 18 is formed in the exhaust chamber 12 by the side wall 12 c, the flow plate 14 and the guide plate 16. In the noise reduction chamber 18, sound generated when water is dropped from the opening 15 and sound generated when air and water pass through the narrow channel 17 interfere with each other. As a result, their sound pressure level is lowered, and noise is effectively reduced.

  The space below the flow plate 14 and the guide plate 16 in the exhaust chamber 12 is a gas-liquid separation zone 19. In the gas-liquid separation zone 19, the cross-sectional area of the flow path gradually increases from the narrow flow path 17 side toward the exhaust duct 13 side. Further, the bottom surface 12a of the exhaust chamber 12 is an inclined surface that becomes lower from the narrow channel 17 side toward the exhaust duct 13 side. Thereby, the water led from the opening of the narrow channel 17 to the bottom surface 12a of the exhaust chamber 12 flows to the exhaust duct 13 side. Further, the air that has passed through the narrow channel 17 also flows toward the exhaust duct 13 in the same manner as the water guided to the bottom surface 12a.

  As shown in FIG. 1, a plurality of gas-liquid separation plates 20 (gas-liquid separation means) are arranged between the narrow channel 17 and the exhaust duct 13. Each gas-liquid separation plate 20 separates moisture (water containing paint mist) from the air that has passed through the narrow channel 17. Thereby, the separated water falls to the bottom surface 12a of the exhaust chamber 12 and flows to the exhaust duct 13 side. Each gas-liquid separation plate 20 is disposed away from the bottom surface 12 a of the exhaust chamber 12. The exhaust duct 13 exhausts the air purified through the gas-liquid separation plates 20 to the outside of the exhaust chamber 12.

  In addition, a drainage channel 21 as a drainage reservoir is installed at a position below the bottom surface 12 a of the exhaust chamber 12. In the present embodiment, the drainage channel 21 is installed outside the exhaust chamber 12. The drainage channel 21 is disposed downstream of each gas-liquid separation plate 20 on the bottom surface 12a. In the drainage channel 21, water flowing through the bottom surface 12a (water guided to the bottom surface 12a from the opening of the narrow channel 17 and water separated by each gas-liquid separation plate 20) temporarily accumulates. ing.

  Next, the operation of the exhaust treatment device 11 will be described.

  First, when a top coat is applied by spraying a coating material from a coating machine, the oversprayed coating material, together with the air in the coating chamber 3, opens the opening of the flow plate 14 disposed in the exhaust chamber 12. 15 is guided to the guide plate 16 and blown out to the gas-liquid separation zone 19. In this state, in the narrow channel 17, the water dropped from the opening 15 is atomized, and the water droplets are brought into gas-liquid contact with the contaminated air sucked from the coating chamber 3, so that the paint mist contained in the contaminated air Is collected.

  At this time, most of the water droplets generated in the narrow channel 17 are guided to the bottom surface 12 a of the exhaust chamber 12. And the water guide | induced to the bottom face 12a of the exhaust chamber 12 from the narrow flow path 17 flows along an inclined surface (bottom face 12a), and is guide | induced to the drainage channel 21 side. The flow of water guided to the bottom surface 12a of the exhaust chamber 12 is accelerated not only by the inclination of the bottom surface 12a but also by the momentum of air flowing in the same direction as the flow of water. Furthermore, the water flow guided to the bottom surface 12 a of the exhaust chamber 12 flows to the drainage channel 21 side without being blocked by each gas-liquid separation plate 20. Accordingly, since the bottom surface 12a of the exhaust chamber 12 is more reliably washed away, the bottom surface 12a can be prevented from becoming dirty.

  In addition, some of the water droplets generated in the narrow channel 17 are guided to the exhaust duct 13 side together with the air that has passed through the narrow channel 17. At this time, since the cross-sectional area of the gas-liquid separation zone 19 gradually increases from the narrow flow path 17 side to the exhaust duct 13 side, the air flow rate gradually decreases toward the exhaust duct 13 side. Water droplets that flow with the air easily fall onto the bottom surface 12a of the exhaust chamber 12. Further, the water droplets flowing along with the air are separated from the air by each gas-liquid separation plate 20. The separated water falls on the bottom surface 12 a of the exhaust chamber 12. At this time, the separated water is washed together with the water that has flowed from the upstream side through the bottom surface 12 a of the exhaust chamber 12 and guided to the drainage channel 21.

  Therefore, according to the present embodiment, the following effects can be obtained.

  (1) The drainage channel 21 is disposed at a lower position downstream of each gas-liquid separation plate 20 different from the position directly below the narrow channel 17. That is, since the drainage channel 21 is not arranged on the upstream side of the gas-liquid separation plate 20, bubbles are hardly generated on the upstream side of the gas-liquid separation plate 20, and even if bubbles are generated, they will grow greatly. Absent. Therefore, bubbles are generated in the drainage channel 21, and the bubbles overflowing from the drainage channel 21 are guided to the gas-liquid separation plate 20 by the air flow, pass through the gas-liquid separation plate 20, and pass through the exhaust duct 13 to the outside of the exhaust chamber 12. Can be prevented from being discharged. Therefore, it is possible to prevent a decrease in the collection efficiency of the paint mist in the gas-liquid separation plate 20 due to the generation of bubbles.

  Further, the drainage channel 21 is not disposed directly below each gas-liquid separation plate 20 but is disposed on the downstream side of each gas-liquid separation plate 20. Accordingly, since substantially the entire bottom surface 12a of the exhaust chamber 12 is washed away, the bottom surface 12a can be prevented from becoming dirty, and the cleaning burden during maintenance can be reduced.

  (2) The bottom surface 12a of the exhaust chamber 12 is an inclined surface that becomes lower from the narrow channel 17 side toward the exhaust duct 13 side. Therefore, the water guided from the narrow channel 17 to the bottom surface 12 a of the exhaust chamber 12 is not limited to the bottom surface 12 a but is guided to the drainage channel 21 on the downstream side of the narrow channel 17. Furthermore, the direction of air flow and the direction of water flow are equal to each other. Therefore, the flow of water guided to the bottom surface 12a of the exhaust chamber 12 is increased not only by the inclination of the bottom surface 12a but also by the momentum through which the air flows, so that the flow of water becomes even easier. Accordingly, since the bottom surface 12a of the exhaust chamber 12 is more reliably washed away, the bottom surface 12a can be further prevented from being contaminated, and the cleaning burden during maintenance can be reduced.

  Further, some of the water droplets generated in the narrow channel 17 are guided to the exhaust duct 13 side together with the air passing through the narrow channel 17 and separated from the air by the gas-liquid separation plate 20. Since the drainage channel 21 is at a lower position on the downstream side of the gas-liquid separation plate 20, the separated water falls on the bottom surface 12 a of the exhaust chamber 12. At this time, the separated water does not stay on the bottom surface 12 a of the exhaust chamber 12, but is washed away with the water flowing from the upstream side to the bottom surface 12 a of the exhaust chamber 12 and led to the drainage channel 21. Therefore, it is possible to prevent the portion immediately below the gas-liquid separation plate 20 from becoming dirty on the bottom surface 12a.

  Moreover, since it becomes unnecessary to deepen the drainage channel 21 in order to prevent generation | occurrence | production of a bubble, the enlargement to the up-down direction of the coating booth 1 with an air supply can be prevented.

  (3) Each gas-liquid separation plate 20 is disposed away from the bottom surface of the exhaust chamber 12. Therefore, the water that has flowed through the bottom surface 12a of the exhaust chamber 12 from the upstream side of each gas-liquid separation plate 20 can flow smoothly to the drainage channel 21 side without being blocked by each gas-liquid separation plate 20. Moreover, it can prevent each gas-liquid separation board 20 getting dirty with the paint mist contained in the water which flowed from the upstream of each gas-liquid separation board 20.

  In addition, you may change embodiment of this invention as follows.

  In the above embodiment, the drainage channel 21 is disposed at a lower position downstream of each gas-liquid separation plate 20. However, as shown in FIG. 2, the drainage channel 21 may be disposed directly under each gas-liquid separation plate 20.

  In the above embodiment, the water that has passed through the opening 15 is guided to the bottom surface 12 a of the exhaust chamber 12 from the opening of the narrow channel 17 formed between the tip of the guide plate 16 and the side wall 12 c of the exhaust chamber 12. It was supposed to be. However, the guide plate 16 may be omitted, and the narrow channel 17 may be formed at the lower end of the opening 15 so that water passing through the opening 15 is dropped directly onto the bottom surface 12 a of the exhaust chamber 12.

  In the above embodiment, the object 2 to be coated with the paint was an automobile body. However, the article to be coated 2 may be an automotive component such as an aerodynamic addition (such as a spoiler) or a bumper. In addition, the to-be-coated object 2 does not necessarily need to be an automotive part.

  In the above embodiment, the coating performed on the workpiece 2 is a top coating. However, the coating performed on the article 2 may be undercoating or intermediate coating.

  Next, in addition to the technical ideas described in the claims, the technical ideas grasped by the embodiment described above are listed below.

  (1) The exhaust treatment apparatus for a paint booth with air supply according to any one of claims 1 to 3, wherein the drainage storage part is disposed immediately below the gas-liquid separation means.

  (2) The gas-liquid separation means is disposed apart from the bottom surface of the exhaust chamber, and the paint booth with air supply according to any one of claims 1 to 3 and the technical idea (1) is provided. Exhaust treatment equipment. Therefore, according to the technical idea (2), the liquid flowing on the bottom surface of the exhaust chamber can be smoothly flowed to the drainage storage part side without being blocked by the gas-liquid separation means.

BRIEF DESCRIPTION OF THE DRAWINGS FIG. The schematic sectional drawing which shows the painting booth with air supply of other embodiment.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 ... Painting booth with air supply 3 ... Painting chamber 11 ... Exhaust treatment device 12 ... Exhaust chamber 12a ... Bottom surface 12b, 12c ... Side wall 13 ... Exhaust duct 14 ... Flow plate 15 ... Opening 16 ... Guide plate 17 as guide means ... Liquid Narrow flow path 20 as atomization part ... Gas-liquid separation plate 21 as gas-liquid separation means ... Drainage path as drainage storage part

Claims (3)

A paint booth with air supply that sucks the contaminated air from the painting chamber into the exhaust chamber, atomizes the liquid dropped into the exhaust chamber, and collects the paint mist contained in the contaminated air in gas-liquid contact with the atomized liquid In the exhaust treatment device of
The exhaust chamber includes a flow plate having an opening through which contaminated air passes along with the liquid, a liquid atomization unit that generates atomized liquid, and a gas-liquid that separates a liquid component from the air that has passed through the liquid atomization unit. A separation means; provided on one side wall of the exhaust chamber; and an exhaust duct for discharging the air that has passed through the gas-liquid separation means to the outside, and a drainage reservoir for storing a liquid that has collected the paint mist.
The bottom surface of the exhaust chamber is an inclined surface that becomes lower from the liquid atomization portion side toward the exhaust duct side, and the gas-liquid separation means is disposed between the liquid atomization portion and the exhaust duct. In addition, the exhaust treatment apparatus of the paint booth with air supply is characterized in that the drainage storage section is arranged at a position directly below the gas-liquid separation means or at a lower position downstream of the gas-liquid separation means.   Below the flow plate, there is provided guide means for guiding the contaminated air and liquid that has passed through the opening to the vicinity of the lower end of the side wall on the opposite side of the side wall where the exhaust duct is provided in the exhaust chamber. 2. An exhaust treatment apparatus for a paint booth with air supply according to claim 1, wherein a narrow channel is formed between the tip of the means and the side wall.   3. The exhaust treatment apparatus for a paint booth with air supply according to claim 1, wherein the cross-sectional area of the flow path gradually increases from the liquid atomization portion side toward the exhaust duct side. 4.

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