JP2001205155A - Coating booth - Google Patents

Abstract

PROBLEM TO BE SOLVED: To remarkably reduce noise to coating workers while keeping excellent collecting efficiency of coating mist in a wet coating booth in order to improve the working environment, where workers are obliged to work with the noise such as the sound of a ventilation fan or the draining generated in the wet coating booth. SOLUTION: Water film formed on a front face water current plate is formed into water drops at the tip of a lower part inclined part to be mixed with suction air flow containing coating material mist and water film flowing down inside a coating mist collecting part is formed into water drops at the tip of a dispersion plate to be mixed with the suction air flow. Further, the transfer of the sound from the coating mist collecting part to the workers is reduced by forming a water current baffle plate in front of the front face water current plate.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement of a work environment in which a painter is forced to work in the noise of a drain fan or a drain fan generated from a wet paint booth during a paint work, and to improve the work environment. In order to reduce the sound pollution to the outside of the building, to reduce the sound generated from the wet paint booth,
The present invention relates to a technique for improving a wet painting booth structure.

[0002]

2. Description of the Related Art Painting work is legally required to use a local exhaust system. In addition, from the viewpoint of pollution control, it is required to efficiently collect paint mist generated during painting work in a painting booth. However, as a result, the paint mist collection performance and maintainability of the painting booth were being improved, but the improvement of the work environment for the painter was not started in earnest, and the painter was able to leave the paint booth. Work had to be performed in the noise generated by the exhaust fan and draining noise. In addition, measures to affect the surrounding environment due to noise emitted from the exhaust duct to the outside were not sufficient.

[0003] Painting booths are broadly classified into dry painting booths and wet painting booths. In the dry paint booth, paint mist generated during painting work is caught in the suction airflow by the exhaust fan, and the paint mist collides and adheres to the paint mist collection plate that forms a maze called a baffle plate by inertia,
The paint mist is collected by attaching the paint mist to a fibrous filter. The present applicant also disclosed in
42744 proposes a paint mist collecting structure for a dry paint booth. However, in the dry paint booth, the noise of the exhaust fan easily passes through the baffle plate and the filter. Have.

On the other hand, in a wet-type painting booth, a shower-type painting booth in which water in a water tank is collected by passing a paint mist into water droplets sprayed by a pump in the form of a shower, or water in a water tank is exhausted without using a pump. Venturi that draws water and paint mist together with the suction air at high speed through the venturi part called a swirl chamber only by the suction force of the fan, and collects paint mist in water droplets by gas-liquid contact and inertial force due to centrifugal force at this time. There is a painting booth. The Venturi-type painting booth is superior to the shower-type painting booth in terms of the collection efficiency of the paint mist, and the use of the Venturi-type painting booth is preferable in terms of anti-pollution. The present applicant has disclosed Japanese Patent Application Laid-Open No. 56-70872.
Japanese Patent Application Laid-Open No. 57-10367 discloses inventions relating to these coating booths.

[0005] In a shower-type painting booth, the exhaust fan and the shower sound directly affect the operator as a sound of about 80 db. On the other hand, in the Venturi-type painting booth, the sound of the exhaust fan and the drainage is high, about 83 db, by passing the water and the paint mist together with the suctioned air through the venturi section with a turbo exhaust fan. Among them, the collection efficiency of paint mist was the best, but the situation was the worst in terms of sound to workers.

[0006]

SUMMARY OF THE INVENTION The present invention significantly reduces the noise to the painter while maintaining good paint mist collection efficiency in a wet paint booth, and at the same time, reduces the noise from the exhaust duct to the outside. The task is to reduce pollution.

[0007]

According to a first aspect of the present invention, there is provided a wet coating booth in which a paint mist is sucked into a processing tower together with an air flow sucked by an exhaust fan and collected by water, and an overflow tank is provided at an upper portion thereof. The upper supply water supplied to the overflow tank overflows, is disposed in front of the treatment tower, and flows down to the front water flow plate having an inclined portion in a rearward direction of the treatment tower at a lower portion to form a water film. Opening a suction port of the air flow under the inclined portion and forming the water film into droplets at the tip of the inclined portion to mix with the air flow, and furthermore, a plurality of water films on front and rear wall surfaces in the processing tower. An eaves-shaped dispersing plate is disposed above the inclined portion so as to sequentially change its direction with respect to the direction of the inclined portion so as to meander the suction airflow from the suction port, and from above to below the dispersing plate. Supply water to the other dispersion plate It is allowed, and the structure to be mixed with the suction air flow by the liquid droplets at the tip of the dispersion plate. In the second invention, a configuration in which an eaves-shaped drainer in the opposite direction to the direction of the uppermost dispersing plate is disposed on the dispersing plate. Third
In the invention of the fourth aspect, the tip shape of the inclined portion of the front water flow plate and the tip shape of the dispersion plate are made uneven, and further, the upper supply water and the lower supply water flowing down as a sawtooth shape are easily formed into droplets. . In the fifth invention, the lower supply water is supplied in a film form from the internal overflow tank onto the dispersion plate. In the sixth invention, the upper supply water overflows from the overflow tank, and flows down to a baffle plate which is provided at a front portion of the front water flow plate and is vertically spaced at a horizontal distance to form a water film. The upper supply water that did not flow down to the baffle plate was transferred to the front water flow plate and flowed down. In the seventh invention, the upper supply water flowing down the front water flow plate and the lower supply water flowing down from above the dispersion plate are dropped to a buffer portion provided at a lower portion of the front water flow plate. It was configured to return to the aquarium. In the seventh invention, a space is formed between the front wall plate of the treatment tower and the front water flow plate.

[0008]

1 and 2 show the construction of a coating booth according to the present invention. FIG. 1 shows a case where a water baffle plate is provided, and FIG. 2 shows a case where a water baffle plate is not provided. (A)
FIG. 2 is a cross-sectional configuration view, and FIG. FIG. 3 is a side view of a pump installation side, and FIG. 4 is a detailed cross-sectional view of a mist collecting unit. 5 and 6 are detailed views for explaining formation of a water film on the water baffle plate of FIG. 1. FIG. 5 is a detailed sectional view and FIG. 6 is a bird's-eye view.

First, referring to FIGS. 2, 3, 4 and 7, a structure without a water baffle plate will be described.
Water is sent from the main pipe 4 to the internal pipe 6 via the valve 5 by the pump 3, and the valve 7
The water is sent to the upper pipe 8 via. A turbo-type exhaust fan 9 is installed at the upper part of the booth, and generates a suction air flow 11 at an opening 10 on the front face of the booth. Suction air 1
1 is a paint mist generated by the spray gun 12 during painting.
3 is sent together with the air flow 11a from the suction port 11g to the mist collecting section 14, and the clean air 11b in which the paint mist 13 is collected by the mist collecting section 14 is separated into water drops by the eliminator 15a provided in the processing tower 15. , Clean air 11
(c) The air is sucked by the exhaust fan 9 as the clean air 11d, and is exhausted outdoors as the exhaust air 11e by an exhaust duct (not shown) or the like.

The upper supply water sent to the upper pipe 8 overflows an overflow tank (hereinafter referred to as a gutter) 16 in the form of a film and flows to a front water flow plate 17 provided in front of the treatment tower 15 to form a water film 18. The spray film 12 is formed on the water film 18.
A part of the paint mist 13 collides and is taken in.
Further, the water film 18 is disposed below the front water flow plate 17 in the treatment tower 15.
Is sent to the inclined portion 17b formed in the rearward direction, and is sprayed from the tip 17a of the inclined portion 17b by the flow of the airflow 11a from the suction port 11g to become fine water droplets 18a.
The inclined portion 17b formed at the lower portion of the front water flow plate 17 has various forms in design, and may be formed to be almost horizontal as in the present embodiment. Further, as shown in FIG. 4, the lower supply water 19a sent to the internal pipe 6 is distributed from the internal gutter 19 via the branch pipe 6a to the front wall 15b in the processing tower 15 in an eaves-like manner. The water is passed over the plate 20 as a water film 21 and sent to the tip 20a of the upper dispersion plate. Further, since the supply of water to the upper dispersion plate 20 is supplied in a water film form from the inner gutter 19, there is no unevenness at the tips of the auxiliary dispersion plate and the upper dispersion plate as compared with the conventional water supply from pipes and holes. Droplets are formed, and the collection efficiency of paint mist can be maintained well.

Further, the mist collecting part 14 is provided with the front water flow plate 1.
7, an eave-shaped auxiliary dispersion plate 22 is disposed between the lower inclined portion 17b and the upper dispersion plate 20 on the rear wall surface inside the processing tower 15 in a direction opposite to the inclined portion 17b and the upper dispersion plate 20. A draining plate 23 is disposed on the top 20 in a direction opposite to the inclined portion 17 b of the front flow plate 17 and the upper dispersion plate 20. As a result, the air flow 11a containing the paint mist is applied to the auxiliary dispersion plate 22.
-Meandering air flow 11f by the upper dispersion plate 20 and the draining plate 23
While the flow is meandering, the mixture becomes mixed with the fine water droplets 18a, 18b, and 21a splashed from the inclined portion tip 17a and the dispersion plate tips 20a and 22a, and the paint mist 13 is formed by the gas-liquid contact. 21a.

The tip 17a of the inclined portion at the lower portion of the front water flow plate 17
The fine water droplets 18a and 21a splashed from the dispersion plate tip 20a of the upper and lower dispersion plates 20 rise together with the meandering airflow 11f, and the inertial force is applied to the lower surfaces of the auxiliary dispersion plate 22, the upper dispersion plate 20 and the draining plate 23. They collide and fall down as large droplets. A part of the falling droplet flows to the tip of the auxiliary dispersion plate 22a on the upper surface of the auxiliary dispersion plate 22, and is again sprayed at the tip of the auxiliary dispersion plate 22a to become fine water droplets 18b and the paint mist 13 in the meandering air flow 11f. Liquid contact. Other falling droplets flow from the curved buffer portion 25 to the lower water flow plate 24 inclined toward the near side of the painting booth with the paint mist 13 taken in, and furthermore, a drain groove 1a formed on the right side of the painting booth. And flows into the water tank 1 as drainage 26.

The buffer section 25 has the purpose of reducing the sound of falling from the falling liquid drops, and may be an inclined plate having an angle capable of reducing the falling sound or a combination of the inclined plate and the curved plate. In addition, the lower inclined portion 17 of the front water flow plate 17
b and the upper dispersion plate 20 and the auxiliary dispersion plate 22
It is better to incline so that water flows easily to the side and the dispersion plate tip 20a side / the auxiliary dispersion plate tip 22a side. Further, as shown in FIG.
The shape of a, the dispersion plate tip 20a, and the auxiliary dispersion plate tip 22a is preferably in the form of a concavo-convex shape so as to promote water droplets. In the present embodiment, they are formed in a sawtooth shape. Further, the number of auxiliary dispersion plates 22 is not limited to one as in this embodiment, but may be plural. In this case, the air flow is meandered by the upper dispersion plate and the plurality of auxiliary dispersion plates. The inclined portion 17 is formed like an eave on the front and rear wall surfaces in the processing tower
It is arranged so that its direction is sequentially changed with respect to the direction of the inclined portion 17b above b.

In the mist collecting section 14 according to the present invention, the interval between the tip 17a of the lower inclined portion of the front water flow plate 17, the auxiliary dispersion plate 22, the upper dispersion plate 20, and the drain plate 23 is relatively large, and the meandering air flow The wind speed can be reduced and noise can be reduced while maintaining the paint mist collection efficiency because water can be sprayed and made into fine water droplets even if the wind speed is not high like the venturi part airflow of the conventional venturi type painting booth. This is a structure that greatly contributes. Also, there is no need to use a high-lift turbo exhaust fan to pass water and paint mist with suction air through the venturi at high speed as in a conventional venturi-type painting booth. It is possible to reduce the vibration noise and wind noise of the exhaust fan.

Further, the processing tower 15 immediately below the exhaust fan 9 does not emit low-frequency vibrations generated by the rotation of the exhaust fan 9 and the flow of the clean air 11d to the booth front opening 10 which is the work position of the coating operator. , The front wall 15 of the processing tower 15
A space 28 is provided between b and the front water flow plate 17. As a result, the low-frequency vibration generated in the treatment tower 15 can be attenuated in the space 28, so that the low-frequency vibration is hardly transmitted from the front water flow plate 17 to the booth front opening 10 side. When the front wall 101 of the processing tower 100 directly faces the booth front opening 102 as in the conventional Venturi type painting booth shown in FIG. 8, the rotation of the exhaust fan 104 from the processing tower 100 immediately below the exhaust fan 104 is performed. And the low frequency vibration generated by the air flow of the processing tower 100 is directly transmitted to the coating operator. For this reason, also in the present invention, when the front water flow plate 17 and the front wall 15b of the treatment tower 15 are also used, low-frequency vibration is emitted to the booth front opening 10 side, which is the work position of the coating operator. However, the effect of noise reduction is reduced.

FIG. 1 is based on the booth structure shown in FIG. 2, in which a water baffle plate 50 is additionally provided in front of a front water plate 55. FIG. 5 is a detailed sectional view and FIG. The configuration will be described with reference to FIG. Note that the same parts as those in FIG. The water baffle plate 50 has an effect of reducing transmission of the sound mainly generated in the mist collecting section 14 to the operator side. In addition, since the air is sucked in from the suction port 11g provided at the lower part of the painting booth as the airflow 11a, the wind speed at the booth front opening 10 tends to be uneven in the case of FIG. The wind speed is slow near the ceiling above the, and paint mist tends to be trapped. However, when the water flow baffle plate 50 is provided as shown in FIG. 1, the air flow 11a is dispersed by the water flow baffle plate 50, and it is possible to reduce wind speed unevenness at the booth front opening 10. Further, a part of the paint mist 13 from the spray gun 12 collides with the water film 53b of the water baffle plate 50 and is taken in.

FIG. 5 (B) is a view showing a horizontal section of the water baffle plate 50. The left and right ends of the long plate are bent in the same direction at an angle, and a plurality of the baffle plates are vertically elongated to the hook 50a. When the upper supply water 51a from the pump 3 and the pipe 8 flows into the gutter 51 while being suspended and further spaced apart in the horizontal direction and in front of the front water flow plate 55, it overflows like a film from the gutter 51 to the front. The water film 53 flows down in the form of a water film on the surface of the upper water flow plate 52, and further at the contact point 52a between the upper water flow plate 52 and the water flow baffle plate 50, the water flow baffle plate 50 Move to. Then, the water film 53b flows down the surface of the water flow baffle plate 50, and flows into the water tank 1 as the drain water 26 from the lower water flow plate 24 and the drain groove 1a while taking in the colliding paint mist 13.

The water film 53c which has not migrated from the surface of the upper water flow plate 52 to the water flow baffle plate 50 between the water flow baffle plates 50 among the water films 53 overflowing from the gutter 51 to the front is a front water flow plate. The upper water flow plate 52 is extended to just before the front water flow plate 55 so as to shift to 55.

On the other hand, the water film 54 overflowing from the gutter 51 to the back side is transferred to the upper part 55a of the front water flow plate 55 in the form of a water film, and the water film 54a flows down from the curved upper part 55b to the front water flow plate 55, and While taking in the paint mist 13 colliding with 54b, the paint mist 13 flows from the lower water flow plate 24 and the drain 1a to the water tank 1 as drain 26. In the process, the water film 53c that has not transferred from the surface of the upper water flow plate 52 to the water flow baffle plate 50 as described above transfers to the front water flow plate 55. As a result, it is possible to reduce the rate at which the sound generated by the mist collecting unit 14 and the sound from the exhaust fan 9 passing through the mist collecting unit 14 directly affect the coating operator. Since the water 54 overflowing from the gutter 51 to the back side moves from the position overhanging to the curved upper portion 55b to the upper portion 55a, the gutter 51 and the upper 5
Even if the gap between the gutter 5a and the droplets drops and falls from the gutter 51 and falls from the gutter 51, the gutter 51 falls on the curved upper portion 55b. Has a structure that does not have to worry about flying over painted objects. In the present embodiment, the upper supply water 51a is
Water baffle plate 5
Although a water film is formed on the front water flow plate 55 and the front water flow plate 55, the upper supply water may be separately flowed from a plurality of gutters to the water flow baffle plate 50 and the front water flow plate 55.

In this painting booth, the upper water flow plate 52, the water flow baffle plate 50
Has a structure in which it can only be hooked on the gutter 51 or the hook 50a, and can be easily removed without tools. The mist collection unit 14 and the processing tower 15 are provided with an inspection door 56 for maintenance. When the inspection door 56 is removed, the internal gutter 1 is removed.
9 and the eliminator 15a can be easily removed, and the attached paint mist can be easily cleaned.

[0021]

The present invention is constructed as described above and has the following effects, so that the noise of the paint booth can be reduced while the efficiency of collecting paint mist is maintained. (1) The mist collecting part has a relatively large gap between the front end of the inclined part of the front water flow plate, the auxiliary dispersion plate, and the upper dispersion plate. Since the dropletization is easily performed, even if the wind speed of the meandering air flow is not as high as the air flow of the venturi part of the conventional Venturi type painting booth, water can be sprayed and fine water droplets can be formed. Noise can be reduced while maintaining mist collection efficiency. (2) Further, since water is supplied to the auxiliary dispersion plate and the upper dispersion plate in a water film form, uniform droplets are formed at the tips of the auxiliary dispersion plate and the upper dispersion plate, and the paint mist is trapped. Good collection efficiency can be maintained. (3) Unlike a conventional venturi-type painting booth, it is not necessary to use a high-lift turbo-type exhaust fan to allow water and paint mist to pass at high speed together with suction air through the venturi section. It can be used, reducing the vibration noise and wind noise of the exhaust fan. (4) Since the water flow baffle plate is provided in front of the front water flow plate, the sound generated in the mist collecting section can be shielded, and transmission to the operator can be reduced. (5) Since the water flow baffle plate is provided in front of the front water flow plate, it is possible to reduce wind speed unevenness at the booth front opening. (6) Since a space is provided between the front wall of the treatment tower and the front water flow plate, low-frequency vibrations generated in the treatment tower can be attenuated in the space, and the low-frequency vibration generated from the front water flow plate to the booth front opening side can be reduced. Since the frequency vibration is hardly transmitted, the effect of noise reduction can be achieved.

[Brief description of the drawings]

FIG. 1 is a view showing an embodiment of the present invention, in which a water baffle plate is provided, (A) is a cross-sectional configuration view, and (B) is a front view.

FIGS. 2A and 2B are diagrams showing an embodiment of the present invention, in which there is no water baffle plate, wherein FIG. 2A is a cross-sectional configuration diagram and FIG. 2B is a front view.

FIG. 3 is a side view of a pump installation side.

FIG. 4 is a detailed sectional view of a mist collecting unit.

FIG. 5 is a detailed cross-sectional view illustrating formation of a water film on the water flow baffle plate, and FIG. 5B is a horizontal cross-sectional view of the water flow baffle plate.

FIG. 6 is a bird's-eye view for explaining formation of a water film on a water flow baffle plate.

FIG. 7 is a diagram showing the sawtooth shape of the tip of the inclined portion, the tip of the dispersion plate, and the tip of the auxiliary dispersion plate.

FIG. 8 is a cross-sectional configuration diagram of a conventional Venturi-type painting booth.

[Explanation of symbols]

 9 Exhaust fan 11 / 11a Air flow 11b Suction port 13 Paint mist 14 Collection unit 15 Treatment tower 16/51 Gutter 17.55 Front water flow plate 17b Inclined portion 17a / 20a / 22a Tip 20/22 Dispersion plate 18 / 54b Water Membrane 28 space 50 baffle plate 51 supply water

Claims (8)

[Claims] 1. A wet coating booth in which a paint mist is sucked into a processing tower together with an air flow sucked by an exhaust fan and collected by water, and a wet coating booth having an overflow tank at an upper portion thereof is supplied with water supplied to the overflow tank. Overflow, it is disposed at the front of the treatment tower and flows down to the front water flow plate having a slope in the rearward direction at the bottom of the treatment tower to form a water film, and the water film is formed under the slope. At the same time as opening the air flow suction port, the water film is formed into droplets at the tip of the inclined portion and mixed with the air flow, and a plurality of eave-shaped dispersion plates are further provided on the front and rear wall surfaces in the treatment tower. Above the dispersing plate, sequentially changing the direction with respect to the direction of the inclined portion to meander the suction airflow from the suction port, and supply the lower supply water from above the dispersion plate to the other Drop to the dispersion plate, and form droplets at the tip of the dispersion plate Wet paint spray booth, characterized in that it has a structure to be mixed with the suction air flow by. 2. The wet painting booth according to claim 1, wherein an eaves-shaped draining plate having a direction opposite to the direction of the uppermost dispersing plate is disposed on the dispersing plate. 3. The wet coating booth according to claim 1, wherein the front end of the inclined portion of the front water flow plate and the front end of the dispersion plate have irregularities. 4. The wet process according to claim 1, wherein an irregular shape between a tip shape of the inclined portion of the front water flow plate and a tip shape of the dispersion plate is saw-toothed. painting booth. 5. The wet process according to claim 1, wherein said lower supply water is supplied in a film form from said internal overflow tank onto said dispersion plate. painting booth. 6. A water film is formed by overflowing said upper supply water from said overflow tank and flowing down to a baffle plate which is provided at a front portion of said front water flow plate and is disposed vertically at intervals in a horizontal direction. 4. The apparatus according to claim 1, wherein said upper supply water which has not flowed down to said baffle plate is transferred to said front water flow plate and flows down. Item 5. Wet painting booth. 7. A water tank after the upper supply water flowing down the front water flow plate and the lower supply water flowing down from above the dispersion plate fall into a buffer provided below the front water flow plate. Claim 1, Claim 2, Claim 3
-The wet painting booth according to any one of claims 4, 5, and 6. 8. The apparatus according to claim 1, wherein a space is formed between a front wall plate of the treatment tower and the front water flow plate. -The wet painting booth according to claims 6 and 7.