JP2011088078A - Washing booth apparatus - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To inexpensively provide a washing booth apparatus having high collection efficiency of coating agent mist and capable of solving a problem that the coating agent mist flowing-in an exhaust duct in a large quantity is adhered and deposited on the inside surface of the exhaust duct. <P>SOLUTION: The washing booth apparatus is provided with a water drop producing part 78 for forming the water drops adsorbing and containing coating agent mist by forcibly passing the flow of a wind of the exhaust gas through a water wall formed from water for coating agent collection to produce a spray in the middle of an exhaust path of air containing the coating agent mist sucked by an exhaust fan 18, and further, is vertically provided with a cylindrical cyclone separation part 80 for centrifugally separating the water drops containing the coating agent by generating the turning air to deposit it on the circumferential inner surface of the exhaust duct 16 ranging from the water drop producing part 78 to the exhaust fan 18. <P>COPYRIGHT: (C)2011,JPO&INPIT

Description

  This invention is a flush booth device that collects an excess of coating agent mist such as adhesive or paint sprayed toward an object to be coated with a water film formed on the wall surface of the flush wall of the flush booth. About.

  As this type of flush booth device, water flows along the wall surface of the water flow wall to form a water film there, and the surplus of coating agent mist such as adhesive or paint sprayed from the spraying device toward the object to be coated A part of the sample is collected by the water film, and the coating agent mist that could not be collected by the water film is guided to the exhaust passage together with air, and is collected by the collected water supplied in the exhaust passage. What has been made has been widely used.

For example, Patent Document 1 below discloses an example of this type of flush booth apparatus.
FIG. 5 shows a specific example thereof.
In the figure, reference numeral 200 denotes an object to be coated with an application agent such as an adhesive or paint, and 202 denotes a spraying device such as a spray gun for spraying an application agent mist toward the object 200. is there.

204 is a flush booth, and 206 is an exhaust duct that rises from the flush booth 204.
An axial flow type exhaust fan 208 is provided inside the exhaust duct 206, and the exhaust fan 208 is rotated by a motor 210.
A screen wall 212 as a water flow wall is provided vertically inside the flush booth 204, and an exhaust passage 214 communicating with the interior of the exhaust duct 206 is formed on the back side (left side in the figure).

  A water receiving chamber 216 is provided on the upper back side of the screen wall 212, and water in the water receiving chamber 216 overflows and flows down to the wall surface of the screen wall 212, and a water film is formed on the wall surface of the screen wall 212 by the flowing water. Is to be formed.

  218 is a water tank installed on the floor, 220 is a pumping pump, and water (circulated water) in the water tank 218 is pumped by the pumping pump 220 through the pipe 222 to the upper part of the washing booth 204.

The pumped water is spouted from a spout 224 provided at the tip of the pipe 222 toward a guide 226 configured by a hood of the flush booth 204.
The guide 226 is inclined leftward in the figure, and the water ejected from the ejection port 224 is guided by the guide 226 and flows down leftward in the figure.
The water that has flowed down is dropped into the water receiving chamber 216 through the opening 228.

A weir 230 is provided at the lower end position of the guide 226 in the figure, and the water that flows to the left through the guide 226 forms a water reservoir 232 by the weir action by the weir 230.
The water once stored in the water reservoir 232 overflows the weir 230 by the water flowing downward along the guide 226 and is supplied to the exhaust passage 214 as collected water for the coating agent mist.

  In the case of this flush booth apparatus, a part of the coating agent mist sprayed from the spraying apparatus 202 is a water film formed along the wall surface of the screen wall 212 by a part of the surplus that has not been applied to the article 200. The water is collected and falls to the lower water tank 218 together with the water film.

Further, the remainder of the excess coating agent mist that could not be collected by the water film passes through the lower side of the screen wall 212 and flows into the exhaust passage 214.
The coating agent mist in the exhaust gas flowing into the exhaust passage 214 is collected by the water supplied to the exhaust passage 214 over the weir 230, and falls into the water tank 218 together with the collected water.

Exhaust gas that has flowed into the exhaust passage 214 flows upward in the figure by the suction force of the exhaust fan 208 and flows into the exhaust duct 206.
Exhaust gas that has flowed into the exhaust duct 206 passes through a purification filter and the like, and after being purified, is discharged outside.

  However, in the case of this flush booth device, the efficiency of collecting the coating agent mist in the exhaust gas flowing into the exhaust passage 214 is not sufficient, and the coating agent mist may adhere to the inner surface of the exhaust duct 206 and accumulate. There was a problem and there was room for improvement.

  In particular, in recent years, in order to increase the coating efficiency of the coating agent on the workpiece 200, the tendency of spraying the coating agent mist from the spraying device 202 tends to be weakened. In this case, the coating agent mist on the inner surface of the exhaust duct 206 is reduced. It promotes adhesion and deposition.

When the spraying force of the coating agent mist becomes weak, the amount of the coating agent mist flowing through the lower end of the screen wall 212 and flowing into the exhaust passage 214 side without reaching the water film increases.
On the other hand, if the flow rate of collected water flowing over the weir 230 and flowing into the exhaust passage 214 is increased accordingly, the following problems occur.

The collected water supplied into the exhaust passage 214 narrows the cross-sectional area of the exhaust path, and when the distance of the narrowed path becomes long, the exhaust fan 208 has a large resistance to suction of the exhaust, and the amount of collected water increases. As a result, the suction force and suction amount by the exhaust fan 208 are reduced.
As a result, the necessary wind speed in the vicinity of the coating apparatus 202 (more precisely, the wind speed of the opening of the washing booth 204 (not shown) surrounding the coating apparatus 202) cannot be ensured, and the amount of collected water is easily increased. It is not possible.

  Thus, if it is difficult to increase the amount of collected water supplied to the exhaust passage 214, it is difficult to sufficiently collect the coating agent mist flowing into the exhaust passage 214, and the coating agent mist rides on the wind of the exhaust. It rises with the air and flows into the exhaust duct 206, and the coating agent mist adheres to the inner surface of the exhaust duct 206 and easily deposits.

In particular, since the momentum of the exhaust flow is weakened around the exhaust fan 208, the amount of the coating agent mist that adheres to and accumulates on the inner surface of the exhaust duct 206 around the upper side of the exhaust fan 208 increases.
In this case, frequent cleaning of the exhaust duct 206 is required, and the required cost for cleaning becomes high.

In the case of this flush booth device, if the coating agent is heavier than water, the coating agent may settle in the water receiving chamber 216 and accumulate on the bottom. In this case, the water receiving chamber 216 is cleaned. Since it is difficult to do, the burden for cleaning becomes large.
Thus, if left uncleaned, the coating residue will rot and give off an odor.

  In the flush booth device disclosed in Patent Document 1, the water that overflows over the weir 230 is used as collected water for the coating agent mist in the exhaust passage 214, but a shower nozzle is disposed in the exhaust passage, It is also known that water is sprayed from a nozzle and used as collected water to collect the coating agent mist in the exhaust passage.

For example, this type of flush booth apparatus is disclosed in the following Patent Document 2, Patent Document 3, and Patent Document 4.
However, in this system, there is not enough opportunity for the shower water and the coating agent mist to collide and contact in the exhaust passage, and the coating agent mist that has not contacted the shower water passes through the exhaust passage as it is. It cannot be said that the collection efficiency with respect to the coating agent mist is sufficient.

Japanese Patent No. 3899957 Japanese Patent No. 3770483 JP-A-5-245417 JP-A-6-328025

  The present invention is based on the circumstances as described above, and has a high collection efficiency of the coating agent mist, which can solve the problem that the coating agent mist flows into the exhaust duct and adheres to and accumulates on the inner surface of the exhaust duct. It was made for the purpose of providing a booth device at low cost.

  Thus, according to the first aspect of the present invention, the circulating water in the water tank is pumped up and flown down along the water flow wall provided in the washing booth to form a water film on the wall surface of the water flow wall, and sprayed toward the object to be coated. In the washing booth apparatus in which a part of the excess of the applied coating agent mist is collected by the water film, the coating agent is provided in the middle of the exhaust passage of the air containing the coating agent mist sucked by the exhaust device. A water droplet generating unit that generates water droplets by adsorbing the coating agent mist by generating splashes by forcibly passing the flow of the exhaust wind against the water wall formed by water for collection. In addition, the water passage containing the coating agent is centrifugally separated from the air by generating a whirling along the inner circumferential surface of the exhaust passage from the water particle generation unit to the exhaust device. Cylindrical cyclone separator attached to the inner circumference is provided vertically And the cyclonic separator unit, characterized in that the upper end of the water separation layer formed by the water particles adhering to the circumferential inner surface is provided with a length that does not reach the exhaust device.

  According to a second aspect of the present invention, in the first aspect, the water outlet for forming the water wall is provided above the cyclone separator, and water from the outlet flows toward the water droplet generator. In the process, the coating agent-containing water adhering to the inner circumferential surface is washed away.

  According to a third aspect of the present invention, in the second aspect of the present invention, the ejection port ejects water in the same rotational direction as the whirlwind.

  According to a fourth aspect of the present invention, in any one of the first to third aspects, the water for forming the water wall is the circulating water, and the circulating water is on a guide inclined downward toward the water droplet generating section. The water flowed toward the water droplet generator, the water passing through the water droplet generator hits the wall surface of the water flow wall and flows downward, and the water film flows through the water droplet generator. It is characterized by being formed on the lower side.

  According to a fifth aspect of the present invention, in the fourth aspect, the guide is a first guide portion as a main body portion, and a second tip portion near the water droplet generating portion having a larger inclination angle than the first guide portion. And a guide portion.

  According to a sixth aspect of the present invention, in any one of the fourth and fifth aspects, the guide does not have a bowl-shaped water receiving portion at a tip on the side of the water droplet generating portion, and flows down obliquely along the guide. It is characterized in that the water is blown from the tip and applied to the water flow wall.

  According to a seventh aspect of the present invention, in any one of the first to sixth aspects, at least a part of the water flow wall is configured by an inspection port cover that can be taken out rearward of the flush booth.

  According to an eighth aspect of the present invention, in any one of the first to seventh aspects, the cyclone separating portion is formed by a part of a cylindrical exhaust duct below the exhaust device.

Effects and effects of the invention

  As described above, the present invention provides a water particle generating unit that generates water particles by forcing the flow of the wind of the exhaust gas through the water wall in the middle of the exhaust passage of the air containing the coating agent mist. The cylindrical cyclone separator is turned up and down to centrifuge the water droplets containing the coating agent from the air and from the air until it reaches the exhaust system in the passage. Is provided.

  In the flush booth device of the present invention, since the flow of the wind of the exhaust is forced against the water wall, the coating agent mist contained in the exhaust is absorbed by the water wall and efficiently This can be collected.

  In addition, the coating agent mist can be adsorbed and collected in water droplets generated by forcibly passing the flow of the exhaust wind against the water wall, that is, the water particles generated in the water droplet generating section. The surplus of the coating agent mist can be collected with high efficiency.

  Thus, the water droplets adsorbing and containing the coating agent mist are separated from the air in the exhaust gas by centrifugation when passing through the cyclone separator, and are adhered to the circumferential inner surface of the cylindrical cyclone separator. .

This cyclone separation part is formed below the exhaust device in such a length that the upper end of the water separation layer formed by the water particles adhering to the inner circumferential surface cannot reach the exhaust device. Accordingly, the water droplets containing the coating agent mist are separated from the air in the exhaust before reaching the exhaust device. That is, the water droplets containing the coating agent mist are prevented from flowing over the exhaust device to the downstream side of the exhaust passage.
This effectively prevents the coating agent from flowing over the exhaust system to the downstream side of the exhaust passage, where it adheres to and accumulates on the inner surface of the exhaust duct, or the coating agent adheres to and accumulates on the exhaust fan. Is done.

The present invention is characterized in that the coating agent mist is absorbed by water droplets, and the exhaust passage is circulated downstream in the form of water droplets.
The coating agent mist has extremely small particles compared to the water droplets. Therefore, even if the coating agent mist is allowed to flow in the exhaust passage downstream with the air while the coating agent mist is used, the cyclone separation unit can be separated from the air. It cannot be separated.
However, in the present invention, the coating agent mist is adsorbed to water droplets, and the particles are enlarged and then centrifuged in the cyclone separation unit. Therefore, the coating agent mist can be efficiently separated from the air.

The present invention does not spray the collected water from the shower nozzle as in the conventional washing booth apparatus and applies it to the coating agent mist, but generates water droplets by the flow of the exhaust air containing the coating agent mist. Therefore, in addition to having the feature that the coating agent mist can be efficiently adsorbed and collected in the water droplets, the nozzle is not used for the generation of water droplets. This has the advantage of not causing a problem that the nozzle hole is clogged due to adhesion.
Further, since there is no need to provide a shower nozzle in the exhaust passage, the apparatus can be simply configured without being complicated by the shower nozzle itself and a mechanism for sending water to the shower nozzle for injection. The apparatus cost can be reduced.

Next, according to a second aspect of the present invention, in the process in which the water outlet for forming the water wall is provided above the cyclone separator, and the water from the outlet flows toward the water droplet generator, In this way, the water for forming the water wall is used as the washing water as it is, and the circumference of the cyclone separation part is centrifuged. It is possible to clean the water adhering to the inner surface and effectively prevent the coating agent contained in the water adhering to the inner circumferential surface of the cyclone separator from remaining on the inner circumferential surface and gradually accumulating it. it can.
In addition, the water from this jet nozzle may flow intermittently or may flow continuously.

This spout can eject water in the same rotational direction as the whirlwind in the cyclone separator (claim 3).
If it does in this way, it can prevent that the momentum of the swirl | vortex flow (swirl) in a cyclone isolation | separation part is attenuated by the water spouted from the jet nozzle.

  In the present invention, the circulating water is used as the water for forming the water wall, and the circulating water is dropped on the guide inclined downward toward the water droplet generation unit, and then flows toward the water particle generation unit. And the water which passed the water grain production | generation part is applied to the wall surface of said water flow wall, a wall surface is made to flow downward, and the water film along a wall surface can be made to form under a water grain production | generation part. (Claim 4).

In this way, it is not necessary to separately provide a dedicated pipe for forming a water film and a jet outlet, and water for water droplet generation can be directly flowed along the water flow wall to form a water film.
By doing in this way, the structure of an apparatus can be made a simpler structure and the required cost for an apparatus can be made cheaper.

  In addition, the water droplet generator is located above the water film, that is, in order to form water droplets by applying exhaust air to the water wall at a position close to the exhaust device where a strong suction force acts by the exhaust device. It is possible to generate a large amount of particles effectively, and to form a cyclone separation part on the downstream side closer to the exhaust system, thus creating a strong swirling flow (wind) in the exhaust passage, The particles can be effectively centrifuged from the air in the exhaust.

  According to the fourth aspect of the present invention, the guide may have a first guide portion as a main body portion and a second guide portion on the distal end side having a larger inclination angle than that of the first guide portion. ).

  By providing such a second guide portion with a large inclination angle on the tip side of the first guide portion, the first guide portion with a small inclination angle flows so as to spread uniformly in the width direction of the flush booth. The incoming water is made a downward flow, and the water flowing along the guide can be blown and applied at an appropriate angle toward the water flow wall, so that a water film can be well formed. Here, if the angle of inclination of the second guide portion with respect to the horizontal is small, the water that collides with the water flow wall will bounce off and adhere to the object to be coated, resulting in a serious quality defect. It needs to be bigger.

  When the guide is provided, the tip of the guide on the side of the water droplet generator is not provided with a bowl-shaped water receiving portion, and the water that has flowed obliquely along the guide is blown from the tip of the guide and applied to the water flow wall. (Claim 6).

When a bowl-shaped water receiving part is provided at the tip of the guide and water is once stored in the water receiving part and then overflowed from the guide by overflowing this, the bowl-shaped water receiving part The problem of accumulating coating material residue occurs, and when such coating material deposition occurs, it must be cleaned, and if left uncleaned, the coating material residue will rot and emit an odor. End up.
However, since such a water-receiving part is not provided in this Claim 6, such a malfunction does not arise.

In the present invention, at least a part of the water flow wall can be constituted by an inspection port cover that can be taken out behind the flush booth (Claim 7).
If it does in this way, even when the coating agent from a spraying device adheres to the water flow wall, this can be easily taken out behind the washing booth and cleaned.

  In the present invention, the cyclone separating portion can be configured by a part of the cylindrical exhaust duct below the exhaust device (Claim 8).

It is a figure of the flush booth apparatus which is one Embodiment of this invention. It is the figure which showed the principal part of the flush booth apparatus of FIG. 1 in the state which removed the inspection port cover. It is an action explanatory view showing one action state of the embodiment. FIG. 4 is an operation explanatory diagram of a portion different from FIG. 3. It is the figure which showed an example of the conventional flush booth apparatus.

Next, embodiments of the present invention will be described in detail with reference to the drawings.
In FIG. 1, reference numeral 10 denotes an object to be coated with an application agent such as an adhesive or paint, and reference numeral 12 denotes a spraying device such as a spray gun for spraying the coating agent mist toward the object 10. .
14 is a flush booth, and 16 is an exhaust duct that rises upward from the flush booth 14.

Inside the exhaust duct 16, there is provided an axial flow type exhaust fan 18 that rotates about an axis in the vertical direction, and the exhaust fan 18 is rotated by a motor 20 provided outside the exhaust duct 16. It is like that.
Here, the exhaust duct 16 has a cylindrical first tube body 22 and a second tube body 24, the first tube body 22 is connected to the flush booth 14, and the first tube. A second tubular body 24 is connected to the upper end of the body 22.
The exhaust fan 18 and the motor 20 are provided in the second tubular body 24.

Reference numeral 26 denotes a water tank, and reference numeral 28 denotes a pumping pump. Water (circulated water) in the water tank 26 is pumped upward through the pipe 30 by the pumping pump 28.
The pipe 30 has a vertical pipe 32 and a short horizontal pipe 34 extending horizontally from the upper end thereof, and a water jet 36 is provided at the tip of the horizontal pipe 34.

Here, the jet port 36 is opened in the duct 16, specifically, the inner surface of the upper portion of the first tube 22, and the direction thereof is tangential to the duct 16 as shown in FIG. Strictly speaking, the direction is parallel to the tangent.
Accordingly, the water pumped up by the pumping pump 28 and jetted from the jet port 36 gradually flows downward while rotating along the inner surface of the duct 16.

38 is a water flow plate (water flow wall) for forming a water film provided at the back of the flush booth 14, and a water flow is formed along the front surface (wall surface) of the water flow plate 38, thereby forming a water film there. Is done.
In this embodiment, the water flow plate 38 has a vertical upper portion 40, followed by a lower first inclined portion 42 inclined and extending inwardly of the flush booth 14, and a lower second portion following the first inclined portion 42. An inclined portion 44 is formed.
Here, the inclination angle of the second inclined portion 44 is smaller than that of the first inclined portion 42.
The water flowing along the water flow plate 38 is dropped from the lower end of the second inclined portion 44 to the water tank 26.

As shown in FIG. 2, an inspection port 46 is provided in the rear wall of the flush booth 14, and the inspection port 46 is closed by an inspection port cover 48.
Most of the vertical upper portion 40 of the water flow plate 38 is constituted by the inspection port cover 48.
The inspection port cover 48 has inclined engaging portions 50 and 52 at the upper end and the lower end.

  On the other hand, the main body side of the flush booth 14 is provided with corresponding inclined engaged portions 54 and 56, and the inspection port cover 48 includes the engaging portions 50 and 52 and the corresponding engaged portions 54. And 56 are attached to the main body portion of the flush booth 14 so as to be engaged with each other.

A lock lever 58 is rotatably provided around the shaft 60 as shown in FIG. 2B at the upper rear surface of the inspection port cover 48. By rotating the lock lever 58, the lock lever 58 is rotated. A latching portion 62 at the upper end of 58 is latched or unlocked by a latched portion 64 provided at the edge of the inspection port 46.
The inspection port cover 48 is prevented from coming off from the main body portion of the flush booth 14 by hooking the latching portion 62 of the lock lever 58 to the latched portion 64.
Reference numeral 66 denotes a handle provided on the inspection port cover 48.

Reference numeral 68 denotes a guide constituted by the hood of the flush booth 14, and as a whole, has a shape inclined obliquely downward in the left direction in the figure.
The guide 68 includes a first guide portion 70 that is a main body portion that is relatively gently inclined, and a second guide portion 72 that is bent at a steeper angle than the first guide portion 70.
Here, a gap is formed between the tip of the second guide portion 72 and the water flow plate 38.

In this embodiment, the water jetted into the duct 16 from the jet port 36 flows downward along the inner surface of the duct 16 and then falls onto the upper surface of the guide 68.
The water dropped on the upper surface of the guide 68 is guided by the guide 68 as shown in FIG. 3 and flows so that the upper surface is spread leftward in the width direction of the flush booth 14. A water wall 74 is formed in the gap between the water flow plate 38 and hits the water flow plate 38, and then a water film 76 that flows downward along the water flow plate 38 is formed.

Here, the second guide portion 72 has the following function.
That is, if such a second guide portion 72 is not provided, the water flowing through the first guide portion 70 hits the vertical water flow plate 38 at a steep angle, and a water film 76 is formed on the lower side thereof. It cannot be formed well. In addition, since the water colliding with the water flow plate 38 rebounds and adheres to the article 10 to cause a serious quality defect, it is necessary to increase the inclination angle so as not to cause the rebound.

  Therefore, in this embodiment, the second guide portion 72 that is bent at a steep angle is provided on the distal end side after the first guide portion 70, and the water flowing through the first guide portion 70 is supplied to the second guide portion 70. At the time of advancing to 72, the flow is expanded in the width direction of the water film 76 perpendicular to the paper surface, and the direction of the water flow from the guide 68 is changed to a direction along the water flow plate 38. Therefore, the water film 76 having a quiet flow can be formed well on the lower side.

As shown in FIG. 3, the tip of the second guide portion 72 is not provided with a bowl-shaped water receiving portion, and the water flowing on the second guide portion 72 jumps toward the water flow plate 38. A water film 76 is generated along the water flow plate 38.
The water away from the second guide portion 72 is subjected to a leftward pressing action in the figure due to the flow of exhaust air, which will be described later, and is guided by the flow direction of the second guide portion 72 and the flow of exhaust air It is pressed against the water flow plate 38 by the pressing action and flows downward.

  Of the coating agent mist sprayed from the spraying device 12, a part of the surplus coating agent mist that has not been applied to the article 10 hits the water film 76 and is collected by the water film 76. The water tank 26 is dropped.

In the present embodiment, the air including the coating agent mist inside the washing booth 14 passes through the gap between the guide 68 and the water flow plate 38 as exhaust gas by the suction force generated by the rotation of the exhaust fan 18 and is sucked into the duct 16. Is done.
At this time, the air containing the coating agent mist, that is, the exhaust air, is forced to pass through the water wall 74 formed between the guide 68 and the water flow plate 38.
Then, by forced passage of the exhaust air, splashes (splashes) are generated there and a large amount of water droplets are generated.
In FIG. 3, reference numeral 78 denotes a water droplet generator that generates water droplets in this way.

Thus, when the exhaust wind containing the coating agent mist forcibly passes through the water wall 74, a part of the coating agent mist contained in the exhaust hits the water wall 74 and is collected there. The other part is adsorbed in the generated water droplets and collected in each water droplet.
Here, the air flow caused by the exhaust and the falling water wall 74 intersect, but the exhaust suction force is not easily offset because the exhaust direction and the falling direction intersect. Further, since the crossing distance is short, there is no great resistance against exhaust suction, and there is no problem that the necessary wind speed in the vicinity of the spraying device 12 is lowered.
The large number of water droplets generated in this way then flows upward into the exhaust duct 16 by the suction force of the exhaust fan 18.

Incidentally, in the exhaust duct 16, as shown in FIG. 4, a strong swirl flow (swirl) is generated along the circumferential inner surface of the duct 16 due to the high speed rotation of the exhaust fan 18 and flows into the exhaust duct 16. The water droplets are caused to fly toward the inner surface of the exhaust duct 16 by the centrifugal force generated by the whirl.
That is, the water particles that flow into the exhaust duct 16 together with the exhaust are separated from the air in the exhaust by centrifugation and attached to the inner surface of the duct 16.
In FIG. 4, reference numeral 80 denotes a cyclone separator that separates water droplets by centrifugal force.

As shown in the figure, in the cyclone separator 80, the water separation layer 82 that has been centrifuged and adhered to the inner surface of the duct 16 is caused by the balance between the action of gravity and the upward pulling force of the exhaust fan 18 in the figure. In the figure, the amount of water is large on the lower side, and the amount of water gradually decreases as it moves upward. Finally, the water separation layer substantially disappears above a certain height.
In the figure, h represents the height of the water separation layer 82 generated by the cyclone separation unit 80.

In the present embodiment, the height H ₁ of the duct 16, specifically the first pipe body 22, is higher than the height h of the cyclone separator 80, that is, the water separation layer 82.
Specifically, _{H 1} is the height of 1030mm here. Here, the inner diameter D is φ404.6 mm. The height _{H 2} of the lower end to the exhaust fan 18 of the second tube 24 is 140 mm.
The exhaust fan 18 (that is, the motor 20) has an output of 0.4 kW and the power frequency of the motor 20 is 50 Hz.

As shown in FIG. 4, the water ejection port 36 is disposed at a position higher than the cyclone separation part 80, that is, above the water separation layer 82.
Accordingly, the water ejected from the ejection port 36 flows downward while rotating on the inner surface of the duct 16 and flows downward while washing the water separation layer 82 adhering to the inner surface of the duct 16 by centrifugal force.

The water separation layer 82 is moved in the direction of the vortex along the inner surface of the duct 16 due to the vortex in the duct 16 and finally washed by the flow of water from the jet port 36 based on the movement.
In addition, the direction of the jet of water from the jet nozzle 36 is the same rotation direction as the direction of the swirling flow indicated by the arrow P in FIG.

  As described above, in the flush booth apparatus of the present embodiment, the flow of the exhaust air is forcibly passed through the water wall 74, so that the coating agent mist contained in the exhaust gas is discharged from the water wall 74. It can be absorbed and collected efficiently.

  In addition, the coating agent mist is also adsorbed and collected in water droplets generated by forcibly passing the flow of exhaust air through the water wall 74, that is, water droplets generated in the water droplet generating unit 78. The surplus of the coating agent mist can be collected with high efficiency.

Thus, the water droplets adsorbing and containing the coating agent mist are separated from the air in the exhaust gas by centrifugal separation when passing through the cyclone separator 80, and adhere to the inner circumferential surface of the cylindrical cyclone separator 80. It is done.
As a result, the coating agent flows over the exhaust fan 18 to the downstream side of the exhaust duct 16, where it adheres to and accumulates on the inner surface of the exhaust duct 16, or the coating agent adheres to and accumulates on the exhaust fan 18. Effectively prevented.

In this embodiment, the coating agent mist is absorbed by water droplets, and the exhaust duct 16 is circulated downstream in the form of water droplets.
The coating agent mist has extremely small particles as compared with the water droplets. Therefore, the coating agent mist is allowed to flow downstream of the exhaust duct 16 together with air while being applied to the air, and the cyclone separator 80 tries to separate the coating agent mist from the air. Cannot be separated well.
However, in the present embodiment, the coating agent mist is adsorbed to water droplets, and the particles are enlarged and then centrifuged in the cyclone separation unit 80. Therefore, the coating agent mist can be efficiently separated from the air. .

Further, in the present embodiment, the collected water is shower-injected from the shower nozzle and applied to the coating agent mist as in the conventional flush booth device, and the flow of the exhaust air containing the coating agent mist is not. Therefore, the coating agent mist can be efficiently adsorbed and collected in the water droplets and, in addition, the nozzle is not used for generating the water droplets. This has the advantage of not causing a problem that the nozzle hole is clogged by adhering to the nozzle.
Further, since there is no need to provide a shower nozzle in the exhaust passage, the apparatus can be simply configured without being complicated by the shower nozzle itself and a mechanism for sending water to the shower nozzle for injection. The apparatus cost can be reduced.

In the present embodiment, the water jet port 36 for forming the water wall 78 is provided above the cyclone separating unit 80, and the cyclone separation is performed in the process of flowing the water from the jet port 36 toward the water droplet generating unit 78. The water containing the coating agent adhering to the inner circumferential surface of the portion 80 is washed and allowed to flow down.
That is, the water for forming the water wall 74 is used as it is as the cleaning water, and the water adhering to the circumferential inner surface of the cyclone separator 80 is cleaned by centrifugation. Accordingly, it is possible to effectively prevent the coating agent contained in the water adhering to the circumferential inner surface of the cyclone separating unit 80 from remaining on the circumferential inner surface and gradually accumulating.

  Further, since this jet port 36 is designed to jet water in the same rotational direction as the whirling air in the cyclone separating unit 80, the water jetted from the jet port 36 causes the swirling flow (wind) in the cyclone separating unit 80. It can prevent the momentum from being diminished.

In the present embodiment, the circulating water is used as the water for forming the water wall 74, the circulating water is dropped onto the guide 68, then flows toward the water droplet generator 78, and passes through the water droplet generator 78. The water is applied to the water flow plate 38 to form a water film 76 below the water droplet generation unit 78, and in this way, a dedicated pipe and spout for water film formation are formed. The water film may be formed by using water for generating water droplets as it is.
By doing in this way, the structure of an apparatus can be made a simpler structure and the required cost for an apparatus can be made cheaper.

  The water droplet generator 78 is provided at a position close to the exhaust fan 18 where a strong suction force is exerted by the exhaust fan 18, which can effectively generate a large amount of water droplets. Since the downstream cyclone separator 80 is provided at a position close to the exhaust fan 18, a strong swirling flow (wind) can be generated in the exhaust duct 16, and water droplets are effectively separated from the air in the exhaust. can do.

In this embodiment, since the second guide portion 72 having a large inclination angle is provided on the tip side of the first guide portion 70, the water flowing through the first guide portion 70 is directed toward the water flow plate 38. It can fly at an appropriate angle and hit the water flow plate 38, and the water film 76 can be formed satisfactorily.
In addition, since the bowl-shaped water receiving portion is not provided at the tip of the guide 68, there is no problem that the coating material residue accumulates in the bowl-shaped water receiving portion.

  Furthermore, in this embodiment, since a part of the water flow plate 38 is constituted by the inspection port cover 46 that can be taken out behind the washing booth 14, even when the coating agent from the spraying device 12 adheres thereto, This can be easily taken out behind the washing booth 14 and cleaned.

  Although the embodiment of the present invention has been described in detail above, this is merely an example, and the present invention can be configured in various forms without departing from the spirit of the present invention.

DESCRIPTION OF SYMBOLS 10 Substrate 14 Flushing booth 16 Exhaust duct 18 Exhaust fan 26 Water tank 36 Spout 38 Water flow plate (water flow wall)
48 Inspection port cover 68 Guide 70 First guide part 72 Second guide part 74 Water wall 78 Water droplet generation part 80 Cyclone separation part

Claims (8)

A water film is formed on the wall surface of the water flow wall by pumping up the circulating water in the water tank and flowing down along the water flow wall provided in the washing booth. In the washing booth apparatus adapted to collect the part with the water film,
Splashes are generated by forcing the flow of the exhaust air through the water wall formed by the water for collecting the coating agent in the middle of the exhaust passage of the air containing the coating agent mist sucked by the exhaust device. And providing a water droplet generating part for generating water particles containing the coating agent mist adsorbed,
During the period from the water droplet generation part to the exhaust device in the exhaust passage, a whirling is generated along the circumferential inner surface to centrifuge the water droplets containing the coating agent from the air, and the circumferential inner surface Cylindrical cyclone separator to be attached to the top and bottom,
Further, the cyclone separator is provided with a length so that an upper end of a water separation layer formed by water particles adhering to the inner circumferential surface does not reach the exhaust device.   2. The circumferential inner surface according to claim 1, wherein a water outlet for forming the water wall is provided above the cyclone separating portion, and the water from the outlet flows toward the water droplet generating portion. A washing booth apparatus characterized in that the water containing the coating agent adhering to the water is washed away.   3. The flush booth apparatus according to claim 2, wherein the jet nozzle ejects water in the same rotational direction as the whirl.   4. The water for forming the water wall according to claim 1, wherein the water for forming the water wall is the circulating water, and the circulating water falls on a guide inclined downward toward the water droplet generation unit, and then the water. The water flowing toward the grain generation unit, the water that has passed through the water grain generation unit hits the wall surface of the water flow wall and flows downward, and forms the water film below the water grain generation unit; Flushing booth device characterized by being.   5. The guide according to claim 4, wherein the guide includes a first guide portion as a main body portion, and a second guide portion at a tip side portion close to the water droplet generation portion having a larger inclination angle than the first guide portion. A flush booth device characterized by   6. The guide according to any one of claims 4 and 5, wherein the guide does not have a bowl-shaped water receiving portion at a tip on the side of the water droplet generating portion, and water that flows obliquely along the guide is blown from the tip. The flush booth device is adapted to hit the water flow wall.   7. The flush booth apparatus according to claim 1, wherein at least a part of the water flow wall is constituted by an inspection port cover that can be taken out behind the flush booth.   8. The flush booth apparatus according to claim 1, wherein the cyclone separation portion is configured by a part of a cylindrical exhaust duct below the exhaust device.

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