JP2002336749A - Circulating coating booth apparatus for automobile - Google Patents

Abstract

PROBLEM TO BE SOLVED: To perform coating work in a coating booth while air pollution is prevented, the safety of the work is secured, and high quality is kept. SOLUTION: A suction chamber 6 is installed in the front part of the coating booth 3, an ejection chamber 9 is installed in the ceiling part 7, and an air feed chamber 10 is installed in the rear side upper part. When a circulating fan 57 installed in the suction chamber 6 is operated, a coating exhaust gas in the coating booth 3 is sucked into the suction chamber 6, a coating mist is removed by a mist removing filter 22, and organic solvent components are removed by an active carbon filter 50a. After that, active carbon dust is removed by a dust removing filter 56. Cleaned air is supplied to the ejection chamber 9 to be ejected downward into the coating booth 3 through an ejection filter 72. Outside air sucked by the operation of an air feed fan 82 installed in the air feed chamber 10 is ejected downward on the rear part side in the coating booth 3 through an air feed filter 81, and the excess coating mist generated on the rear part side is moved downward.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of purifying a coating exhaust gas generated in a coating booth, appropriately circulating the exhaust gas, and supplying outside air into the booth from the upper rear portion of the coating booth. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulation type painting booth device which can prevent contamination, enables high-quality painting, and ensures the safety of painting work.

[0002]

2. Description of the Related Art A conventional painting booth apparatus for painting a portion to be painted of an automobile body in a painting booth in which a car can enter and exit is provided by forcibly supplying and exhausting air to a painting booth. Exhaust paint mist caused by painting was released to the atmosphere by exhaust,
There is a problem that an organic solvent component and the like contained in the coating exhaust gas cause air pollution, and in some cases, residents in the vicinity have been required to relocate the coating facility.

In view of the above, a circulating coating booth apparatus has been proposed in Japanese Patent Application Laid-Open No. 57-75121, in which the coating exhaust gas is purified as required and circulated. This circulation type coating booth device sends outside air removed by a filter into the coating booth, and removes coating mist and organic solvent components contained in coating exhaust gas discharged from the coating booth. After purification, the purified air was returned to the painting booth to circulate exhaust gas.

[0004]

The above-mentioned publications disclose the basic technology of introducing outside air into a coating booth and purifying and circulating coating exhaust gas as required. How to introduce outside air for efficient circulation, how to introduce outside air to improve the safety of painting work in the painting booth, and further improve painting quality There is no description on how to introduce outside air for this purpose.

[0005] Therefore, there is room for further improvement in the conventional circulation type painting booth apparatus for practical use.

[0006] The present invention has been developed in view of the above-mentioned problems of the conventional apparatus, and it is possible to prevent air pollution by properly purifying and circulating coating exhaust gas, as well as to prevent the coating exhaust gas from entering the coating booth. It is an object of the present invention to provide a circulation type painting booth apparatus that can improve the safety of painting work and the quality of painting by appropriately introducing outside air.

[0007]

In order to solve the above-mentioned problems, the present invention employs the following means. That is, in the circulation type coating booth device according to the present invention, a suction chamber is provided at the front of the closed coating booth, a blow-out chamber is provided at the ceiling of the coating booth, and the upper part on the rear side of the coating booth is provided. Is provided with an air supply chamber. The suction chamber includes a mist removal filter that removes excess paint mist generated in the painting booth, a solvent removal filter that removes an organic solvent component contained in air that has passed through the mist removal filter, A part of the air purified by passing through the solvent removing filter is released to the outside and the remaining air is introduced into the blowing chamber, and the introduced air is blown downward into the coating booth through the blowing filter. A circulation fan is provided, and in the air supply chamber, the sucked outside air is blown downward into the coating booth through an air supply filter,
An air supply fan is provided to move excess paint mist generated on the rear side of the painting booth in the downward direction, and the outside air supply from the air supply fan increases the air pressure in the painting booth to positive pressure. Has been set to.
Further, the air supplied into the painting booth from the blowing chamber and the air supply chamber is sucked into the suction chamber by the operation of the circulation fan, and is allowed to pass through the mist removal filter and the solvent removal filter. It is characterized by having done.

[0008] The circulation type painting booth apparatus is preferably
The present invention is applied to painting of an automobile body, and in this case, the painting booth is configured so that an automobile can enter and exit.

In each of the circulation type painting booth devices,
It is preferable that the air supply fan blows air into the painting booth substantially downward. Further, it is preferable that the direction of air blown into the painting booth by operating the air supply fan is variable. In this case, it is preferable that a tiltable louver is provided below the air supply filter, and that the direction of air flow can be easily changed by adjusting the tilt of the louver.

[0010] In each of the circulation type painting booth devices,
The mist removal filter is composed of a primary filter with a coarse mesh that removes relatively large paint mist and a secondary filter with a fine mesh that removes paint mist smaller than that, and the air that has passed through the secondary filter is , So as to pass through the solvent removal filter configured as an activated carbon filter, and so that the activated carbon dust generated in the activated carbon filter is removed by the dust removal filter,
It is preferable that air purified by passing through the dust removal filter is introduced into the blow-out chamber by operating the circulation fan.

In the circulation type coating booth apparatus, the activated carbon filter is formed in a wide plate shape in the front-rear direction, and a plurality of the activated carbon filters are arranged side by side over substantially the entire width in the left-right direction of the primary filter. It is preferable that the air passing between the activated carbon filter rows in the installed state be rectified.

In each of the circulation type painting booth apparatuses, the blow-out chamber is provided on the rear side except for the front part of the ceiling, and the air supplied into the painting booth is provided below the suction chamber. The suction may be configured to be drawn into the suction chamber through the side portions, so that an obliquely downward airflow from the ceiling toward the suction chamber is generated.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. Referring to FIG. 1, a circulation type painting booth apparatus 1 according to the present invention is applied as a simple type of dedicated automobile apparatus for partially painting an automobile body, and is provided at a front portion of a painting booth 3 configured so that an automobile 2 can enter and exit. A suction chamber 6 is provided, and a ceiling 7 of the painting booth 3 is provided.
Is provided with a blow-out chamber 9, and an air supply chamber 10 is provided at the rear upper portion of the painting booth 3. And the ceiling 7
As shown in FIGS. 1 and 3 and 4, the front plate 12 is disposed at the upper end of the front plate 12 erected on the floor surface 11 so as to extend rearward in parallel with the floor surface 11. And is suspended from the ceiling of the factory building via suspension bolts (not shown).

The left and right sides 16, 16 of the space 15 below the ceiling 7 are, for example, as shown in FIGS.
Opening / closing body 18, 1 composed of 18a2, 19a1, 19a2
9 and can be opened and closed, and the rear portion 17 of the space 15
It can be opened and closed by the opening and closing body 20 composed of the same curtain 20a as described above. These curtains 18a1, 18a
3, 19a1, 19a2, and 20a are lower surfaces 7 of the left and right edges and the rear edge of the ceiling 7 as shown in FIGS.
It is opened and closed by being guided by a curtain rail 21 (FIGS. 3 and 5) which is arranged continuously to the position a. As shown in FIG. 5 and FIGS. 1 and 2, an upper end 23 a of a hanging piece 23 made of, for example, vinyl chloride is fixed to the lower surface 7 a so as to be located outside the curtain rail 21. The hanging piece 2
Numeral 3 covers the suspended portion 23 of the suspended curtain from outside thereof, and effectively prevents the coating exhaust gas from leaking out of the coating booth from the gap generated in the suspended portion 24.

A bag-like portion 8 is formed at the lower end of these curtains as shown in FIGS. 5 and 6, and a weight W made of, for example, a chain extends in the longitudinal direction of the bag-like portion 8. It is housed as such. A skirt 14 is continuously provided at the lower end of the bag-shaped portion 8, and a lower end portion 14a of the skirt 14 is in close contact with the floor 11 in a bent state as shown in FIG. The closed coating booth 3 can be formed by closing the opening / closing members 18, 19, and 20. By opening the rear opening / closing member 20 as shown in FIG. It is configured so that it can enter and exit the painting booth 3. In FIG. 3, for convenience of explanation,
The opening / closing members 18, 19, 20 and the hanging pieces 22 are omitted, and only the curtain rail 21 is shown. In FIG. 4, the curtain is omitted.

The suction chamber 6 sucks the coating exhaust gas generated in the coating booth 3 through the mist removal filter 22, and as shown in FIGS. 1, 3-4 and 8-9, the front panel It is formed in a rectangular parallelepiped box shape protruding forward with 12 as a rear surface portion 24. The length of the rear surface 24 in the left-right direction is set slightly smaller than the length of the front plate 12 in the left-right direction, and the upper surface 25 of the suction chamber 6 is positioned slightly below the ceiling 7. I have. Also, the left and right sides of the upper portion of the rear surface portion 24 of the suction chamber 6 having such a configuration are closed by cover plates 26, 26, and the central portion of the upper portion is closed by a cover plate 27. An inspection port 29 is provided, and a lower portion of the rear surface portion 24 is a suction port 30. In the present embodiment, the suction port 30 is divided into three sections in the left-right direction, and a filter plate 32 is detachably attached to each section 31. The filter plate 32 is provided with a primary filter 33 (a component of the mist removal filter 22) having a coarse mesh for removing a relatively large portion of excess paint mist generated in the paint booth 3. I have.

As shown in FIG. 1 and FIGS. 8 to 9, a first partition 35 is provided on the floor 11 so as to be located slightly in front of the rear surface 24, and the first partition 35 is provided on the floor 11.
And the upper edge of the suction port 30 are closed by a closing plate 37. An opening 39 is provided in a lower portion of the partition 35, and the opening 39 is divided into five in the left-right direction. A filter plate 41 is detachably attached to each section, and the filter plate 41 has a secondary filter 42 with a fine mesh that removes a relatively small portion of the extra paint mist in the paint booth 3. Another component of the mist removal filter 22) is provided.

A second partition 43 is erected on the floor 11 so as to be located slightly in front of the filter plate 41. As shown in FIG. 9, an upper end of the second partition 43 is connected to the upper end of the second partition 43. The upper edge of the opening 39 of the first partition 35 and the cover plate 4
It is closed at 7. The second partition 43 has an opening 44 partitioned in the left-right direction into, for example, 36. Each partition 48 removes an organic solvent component contained in the air that has passed through the secondary filter 42. Activated carbon filter 50 containing activated carbon and having a wide plate shape in the front-rear direction.
The two organic solvent removal filters 50 as a are shown in FIGS.
As shown in FIG. 10, they are arranged side by side so as to present a V-shape that opens later and closes forward, and both front ends 49, 49 are supported by receiving columns 51, and each organic solvent removal filter 50a is detachable. . Then, the organic solvent removal filter 50 provided side by side is provided.
A cover plate 52 is provided so as to cover the entire upper portion of the filter, and air flowing from the rear side between two adjacent organic solvent removal filters 50, 50 combined in a V-shape is upwardly moved by the cover plate 52. Is stopped, and flows only forward through the filter 50, as indicated by the arrow in FIG.

As shown in FIGS. 1 and 9, a third partition 52 is horizontally disposed with the activated carbon filter 50a positioned slightly above a portion where the activated carbon filters 50a are arranged side by side. 52 is divided into three in the left-right direction. In each section 53, a filter plate 55 for removing activated carbon dust contained in the air that has passed through the activated carbon filter 50a in the forward direction is detachably attached. , The activated carbon filter 50a
A dust removal filter 56 is provided for removing activated carbon dust contained in air passing through the filter.

As shown in FIGS. 1 and 11, a circulating fan 57 having, for example, a sirocco fan is disposed above the third partition 52, and the left and right suction ports 5 are provided.
8 and 58 are disposed in the suction chamber 6, and the exhaust port 59 is open at the upper surface 25 of the suction chamber 6. The outlet 59 is connected to the front end of the blow-out chamber 9 via a duct 60. An exhaust damper 61 for discharging excess air to the outside (in the present embodiment, inside the factory building) is connected to an intermediate portion of the duct 60.

As shown in FIGS. 1, 3 and 12, the ceiling 7 has lighting fixture mounting portions 62, 62 on the left and right sides, and a central portion having a large vertical thickness and extending in the front-rear direction. It is formed as a long cavity 63. The hollow part 6
As shown in FIG. 12 in which the ceiling cover plate 64 of FIG. 1 and FIG. 2 is removed and shown in FIG. 3, the rear side is divided into two by a partition plate 65, and the front cavity portion is formed by the blowing chamber 9.
On the other hand, the hollow portion on the rear side constitutes the air supply chamber 10. The length in the front-rear direction of the blowing chamber 9 is, for example, 3800.
mm, and the front and rear length of the air supply chamber 10 is set to, for example, about 800 mm. As shown in FIG. 3, the left and right lighting fixture mounting portions 62 are provided with three lighting fixtures 66 in the front-rear direction on the lower surface side.

The lower surface of the ceiling portion 7 is substantially
The third part 67 is blindly formed and the rear part 6
Reference numeral 9 has six sections divided into two in the front-rear direction and three in the left-right direction, and a filter plate 71 is detachably attached to each section. And the filter plate 71
Is provided with a blowout filter 72 for the purpose of finally removing dust introduced into the blowout chamber 9 and making the supply of air into the coating booth 3 uniform.

As shown in FIG. 1 and FIGS. 2 to 4, outside air inlets 75 and 76 with filters for taking in fresh air are provided on the upper surface and the rear surface of the air supply chamber 10. The lower surface of the air chamber 10 is divided into two in the left-right direction, and a filter plate 80 is detachably attached to each section. The filter plate 80 is provided with an air supply filter 81 for the purpose of further removing the taken-in outside air and making the supply of air into the coating booth 3 uniform.

The interior of the air supply chamber 10 is shown in FIGS.
As shown in FIG. 7, an air supply fan 82 is provided at a mounting opening provided at the center in the left-right direction while being divided into two by an inclined plate 77, and the air supply fan 82 is arranged in a forward direction with respect to a vertical line. The angle of the downward inclination to is set to about 15 degrees.

However, in the case of the coating booth apparatus 1 having such a configuration, as shown in FIG.
To open the car 2 in the painting booth 3, and then close the rear opening / closing body 20 as shown in FIGS. When the circulation fan 57 is operated in this state, clean air is introduced into the blow-off chamber 9, and the introduced air is further dust-removed by the blow-off filter 72, and the air flow of the blow-off filter 72 is made uniform. As a result, the air is blown from each part on the lower surface of the blowing chamber 9 into the coating booth 3 with a substantially uniform air volume as shown by an arrow in FIG. At the same time, the operation of the air supply fan 82 causes the outside air inlet 7 to operate.
The outside air is sucked into the air supply chamber 10 through the filters 5 and 76, and the dust is gradually reduced through the air supply filter 81 of the air supply chamber 10, and the dust is directed downward into the painting booth 3 as indicated by an arrow in FIG. To blow out. Since the air supply filter 81 is provided over the entire lower surface of the air supply chamber 10, fresh air is supplied from each part of the lower surface of the air supply chamber 10 at a substantially uniform air volume by the air volume equalizing action of the air supply filter 81. Air is the painting booth 3
It will be blown out inside. And the air supply fan 8
2 is slightly inclined downward toward the front as shown in FIG. 1, and the direction of the blowout is slightly inclined downward toward the front as shown by the arrow in FIG. )
The supplied air quickly moves the excess coating mist generated on the rear side of the coating booth 3 downward. The introduction of outside air by the air supply fan 82 can set the air pressure in the painting booth 3 to a positive pressure.

The air supplied from the blowing chamber 9 and the air supply chamber 10 to the interior of the painting booth 3 flows into the suction chamber 6 in the state shown by the arrow in FIG. It is sucked.

The circulation fan 57 is stronger than the air supply fan 82. The circulation fan has an air volume of, for example, 186 cubic meters per minute, whereas the air supply fan has, for example, an air volume of 186 cubic meters per minute. It has an air volume of 33 cubic meters. Therefore, the operation of the air supply fan 82 does not hinder the air circulation due to the operation of the circulation fan 57.

The circulation fan 57 and the air supply fan 8
The spray mist is sprayed on the part to be painted of the car body while the 2 is operated in this way, and the painting is applied.
Since the air supplied from the blowing chamber 9 into the coating booth 3 is purified, the safety of the coating operation can be ensured. In particular, when performing a painting operation on the rear side 89 of the painting booth 3, the air is blown downward from the air supply chamber 10, thereby moving the excess painting mist generated downward and causing the painting mist to soar. Can be prevented. The paint mist is moved, for example, below the waist of the worker so that the worker does not easily suck the paint mist. Of course, the air blown out in this way is fresh outside air, so that the painting operation can be performed while further securing health safety.

If the air supply fan 82 is not provided, the circulation of air in the painting booth 3 will be achieved, but a stagnation portion of the air will be generated on the rear side 89 of the painting booth. And the density of the organic solvent in that portion is increased. As a result, it is inevitable that the front side 90 of the painting booth 3 must be used as a painting work place. The rear side 89 of the painting booth where
It can be a better painting work place.

Further, since the coating mist can be moved downward as described above, the scattered coating mist can be prevented from adhering to the coating surface, and the coating quality can be improved.

Since the air pressure in the coating booth 3 becomes a positive pressure, the blow-off filter 72 and the air supply filter 81
When air from other sources flows into the coating booth 3, it is possible to prevent dust and dust from entering the coating booth, and therefore, it is possible to prevent a decrease in coating quality due to the adhesion of these.

Then, the blowing chamber 9 and the air supply chamber 10
The air supplied into the coating booth 3 from is moved toward the mist removal filter 22 in the suction chamber 6 by the suction action of the circulation fan 57. This movement occurs because air is blown downward from the air supply chamber 10 by the operation of the air supply fan 82, so that the rear side 89
Without causing stagnation of air. In particular, the air supplied from the suction chamber 19 moves downward to the knee position of the worker as shown by an arrow in FIG. 1, for example, and then bends into an L shape along the floor surface 11. Move toward 6.

In the suction chamber 6, the relatively large paint mist is removed by the primary filter 33 and the smaller paint mist is removed by the secondary filter 4.
Removed at 2. At this time, the coating mist can be captured in a substantially uniform state over substantially the entire surface of the primary filter 33 and substantially the entire surface of the secondary filter 42 due to the rectifying action of the air provided by the parallel arrangement of the activated carbon filters 50a. It will be performed efficiently.

The organic solvent component contained in the air that has passed through the mist removal filter 22 is purified by passing through the solvent removal filter 50, which is the activated carbon filter 50a, in the direction indicated by the arrow in FIG. . In the present embodiment, it is preferable to use an activated carbon filter 50a that can remove at least about 95% of the contained organic solvent component. The air thus purified is then passed through the dust removal filter 56 as shown in FIGS.
Pass as shown by the arrow. By this passage, the activated carbon dust generated in the activated carbon filter 50a can be removed. The air further purified by passing through the dust removal filter 56, as indicated by the arrow in FIG.
Then, the air flows into the suction port 58 of the nozzle 7, and is introduced into the blow-out chamber 9 through the exhaust port 59 through the duct 60. In order to prevent the pressure inside the coating booth 3 from unnecessarily increasing due to the supply of outside air from the air supply chamber 10, excess air is supplied to the outside via the exhaust damper 61 as shown by an arrow in FIG. Released. As a result, most of the exhaust air sucked in the suction chamber 6 is returned to the blowing chamber 9, and only the surplus air is only discharged to the outside. Therefore, the discharge to the outside can be suppressed to the minimum. In addition, the paint mist is almost completely removed by the primary filter 33 and the secondary filter 42, and most of the organic solvent component is removed by the activated carbon filter 50a.
6 removes most of the activated carbon dust, so that there is almost no influence of the pollution caused by the exhaust discharged from the exhaust damper 61 to the outside.

The purified air introduced into the blowing chamber 9 passes through the blowing filter 72 and is blown downward into the coating booth 3. This blowing is performed by further removing the coating mist and the like that have not been removed in the previous steps by the blowing filter 72, and the blowing filter 72 removes the air from the respective parts on the lower surface of the blowing chamber 9 by the air volume equalizing action. Purified air is blown into the painting booth 3 in a substantially uniform state.

As described above, the rear side 89 of the painting booth 3
(Fig. 1) is a good painting work place, so when the rear part of the car body is the part to be painted, the car 2 is advanced into the painting booth 3 and conversely, the front part of the car body is the part to be painted. In such a case, it is preferable to put the automobile 2 into the painting booth 3 with a bag.

The primary filter 33, the secondary filter 42, the activated carbon filter 50a, the dust removal filter 5
6. Since the blowout filter 72 and the air supply filter 81 are all detachable as described above, the maintenance of the apparatus can be performed satisfactorily. The activated carbon filter is
By performing the reproduction process, it can be used repeatedly.

[Other Embodiments] (1) The coating booth apparatus according to the present invention requires a louver 83 which can be tilted in a vertical plane below the air supply filter 81 as shown in FIG. In some cases, a louver device 78 that is arranged side by side at intervals is provided, and the blowing direction of the air blown from the air supply filter 81 into the coating booth 3 may be changed according to the coating conditions. In FIG. 13, solid arrows and alternate long and short dash lines indicate different air blowing directions. For example, when the part to be painted on the automobile body is slightly forward, the louver 83 is moved to the position shown in FIG.
By tilting the paint mist forward as shown by the dashed line, the paint mist generated at that portion can be efficiently moved downward.

(2) The filter in the coating booth apparatus according to the present invention may omit the dust removal filter when the solvent removal filter is not an activated carbon filter.

(3) The coating booth device according to the present invention can be applied to coating other than automobiles.

(4) The coating booth device according to the present invention can be applied not only to coating of automobile bodies but also to coating of various articles such as woodwork products and plastic products.

[0042]

According to the coating booth apparatus of the present invention, the air pollution can be prevented by properly purifying and circulating the coating exhaust gas generated in the coating booth. By appropriately introducing outside air, it is possible to improve the safety of painting work and the painting quality. This will be specifically described below.

(1) In the coating booth apparatus according to the present invention, an air supply chamber is provided in the upper part on the rear side of the coating booth, and an air supply fan is provided in the air supply chamber. It is configured to blow down the paint booth downward through the air supply filter and move the excess paint mist generated on the rear side of the paint booth downward. By preventing the exhaust gas from being generated, almost all of the coating exhaust gas generated in the coating booth can be smoothly moved to the suction chamber, and the coating exhaust gas can be efficiently purified.

(2) With the coating booth apparatus according to the present invention, since the air supplied from the blowing chamber into the coating booth is purified, the safety of the coating operation can be ensured. In addition, the present invention provides an air supply chamber in the upper part on the rear side of the painting booth, so when performing painting work on the rear side of the painting booth,
By the air blown out from the air supply chamber, the generated excess paint mist is moved downward, so that it can be prevented from flying up. Of course, the air blown out in this way is fresh outside air, so that the painting operation can be performed while further securing health safety. Further, as described above, since the coating mist can be moved downward, the scattered coating mist can be prevented from adhering to the coating surface, and the coating quality can be improved. In addition, since the air pressure in the painting booth becomes a positive pressure, it is possible to prevent dust and dirt from entering the painting booth by air entering from outside the outlet filter and the air supply filter entering the painting booth. ,
Therefore, it is possible to prevent the coating quality from being deteriorated due to the adhesion of these components.

(3) In the coating booth apparatus according to the present invention, when the direction of air blown into the coating booth by operating the air supply fan is made variable by a louver device or the like, the coating conditions in the coating booth must be adjusted. The wind direction can be changed accordingly. For example, when the part to be painted on the automobile body is slightly forward, the wind direction can be inclined forward to move the generated paint mist downward.

(4) The mist removal filter provided in the suction chamber is composed of a primary filter having a coarse mesh for removing a relatively large paint mist and a secondary filter having a fine mesh for removing a paint mist smaller than that. When the air passing through the secondary filter is made to pass through a solvent removal filter as an activated carbon filter, and the activated carbon dust generated in the activated carbon filter is removed by the dust removal filter, the coating exhaust gas is used. Purification process can be performed more reliably, and even if surplus exhaust gas is released to the atmosphere, air pollution can be prevented and purified air can be supplied into the painting booth, ensuring the safety and quality of painting work. Can be improved. In this case, particularly, the activated carbon filter is formed in a wide plate shape in the front-rear direction, and a plurality of the activated carbon filters are arranged in parallel over substantially the entire width in the left-right direction of the primary filter, and air passing between the arranged activated carbon filter rows is arranged. When rectification is performed, the coating mist can be captured in a substantially uniform state over substantially the entire surface of the primary filter and substantially the entire surface of the secondary filter, and the efficiency of removing the coating mist can be improved.

(5) Except for the front part of the ceiling part, the blow-off chamber is provided further behind the ceiling part, and the air supplied into the painting booth flows through the lower part of the suction chamber through the suction chamber. When it is configured to be sucked into the suction chamber, a natural oblique airflow from the ceiling to the suction chamber can be formed, and the coating exhaust gas in the coating booth can be efficiently sucked in the suction chamber.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a circulation type painting booth apparatus according to the present invention together with its operation.

FIG. 2 is an overall perspective view thereof.

FIG. 3 is a perspective view showing a configuration of a suction chamber and a ceiling.

FIG. 4 is a perspective view showing a configuration of a suction chamber and a ceiling.

FIG. 5 is a cross-sectional view illustrating a suspended state of a curtain, in which an intermediate portion is omitted.

FIG. 6 is a partial perspective view showing a bag-like portion provided in a lower portion of the curtain together with a stored weight.

FIG. 7 is a perspective view showing a state where a rear opening / closing body is opened.

FIG. 8 is a partially cutaway perspective view illustrating the configuration of a suction chamber.

FIG. 9 is a partially cutaway perspective view showing a configuration of a suction chamber.

FIG. 10 is a cross-sectional view illustrating an action of removing an organic solvent component by an activated carbon filter.

FIG. 11 is an explanatory diagram showing a flow state of air in a suction chamber accompanying operation of a circulation fan.

FIG. 12 is a perspective view illustrating the structure of a ceiling.

FIG. 13 is a cross-sectional view illustrating a louver device.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 Circulation type painting booth apparatus 2 Automobile 3 Painting booth 6 Intake room 7 Ceiling 9 Blow-out room 10 Air supply room 11 Floor surface 18 Opening / closing body 19 Opening / closing body 20 Opening / closing body 22 Mist removal filter 33 Primary filter 42 Secondary filter 50 Organic solvent Removal filter 50a Activated carbon filter 56 Dust removal filter 57 Circulation fan 72 Blow-off filter 81 Air supply filter 82 Air supply fan

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[Procedure amendment]

[Submission date] November 5, 2001 (2001.11.
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Circulation type painting booth device

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of purifying a coating exhaust gas generated in a coating booth, appropriately circulating the exhaust gas, and supplying outside air into the booth from the upper rear portion of the coating booth. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulation type painting booth device which can prevent contamination, enables high-quality painting, and ensures the safety of painting work.

[0002]

2. Description of the Related Art A conventional painting booth apparatus for painting a portion to be painted of an automobile body in a painting booth in which a car can enter and exit is provided by forcibly supplying and exhausting air to a painting booth. Exhaust paint mist caused by painting was released to the atmosphere by exhaust,
There is a problem that an organic solvent component and the like contained in the coating exhaust gas cause air pollution, and in some cases, residents in the vicinity have been required to relocate the coating facility.

In view of the above, a circulating coating booth apparatus has been proposed in Japanese Patent Application Laid-Open No. 57-75121, in which the coating exhaust gas is purified as required and circulated. This circulation type coating booth device sends outside air removed by a filter into the coating booth, and removes coating mist and organic solvent components contained in coating exhaust gas discharged from the coating booth. After purification, the purified air was returned to the painting booth to circulate exhaust gas.

[0004]

The above-mentioned publications disclose the basic technology of introducing outside air into a coating booth and purifying and circulating coating exhaust gas as required. How to introduce outside air for efficient circulation, how to introduce outside air to improve the safety of painting work in the painting booth, and further improve painting quality There is no description on how to introduce outside air for this purpose.

[0005] Therefore, there is room for further improvement in the conventional circulation type painting booth apparatus for practical use.

[0006] The present invention has been developed in view of the above-mentioned problems of the conventional apparatus, and it is possible to prevent air pollution by properly purifying and circulating coating exhaust gas, as well as to prevent the coating exhaust gas from entering the coating booth. It is an object of the present invention to provide a circulation type painting booth apparatus that can improve the safety of painting work and the quality of painting by appropriately introducing outside air.

[0007]

In order to solve the above-mentioned problems, the present invention employs the following means. That is, in the circulation type coating booth device according to the present invention, a suction chamber is provided at the front of the closed coating booth, a blow-out chamber is provided at the ceiling of the coating booth, and the upper part on the rear side of the coating booth is provided. Is provided with an air supply chamber. The suction chamber includes a mist removal filter that removes excess paint mist generated in the painting booth, a solvent removal filter that removes an organic solvent component contained in air that has passed through the mist removal filter, A part of the air purified by passing through the solvent removing filter is released to the outside and the remaining air is introduced into the blowing chamber, and the introduced air is blown downward into the coating booth through the blowing filter. A circulation fan is provided, and in the air supply chamber, the sucked outside air is blown downward into the coating booth through an air supply filter,
An air supply fan is provided to move excess paint mist generated on the rear side of the painting booth in the downward direction, and the outside air supply from the air supply fan increases the air pressure in the painting booth to positive pressure. Has been set to.
Further, the air supplied into the painting booth from the blowing chamber and the air supply chamber is sucked into the suction chamber by the operation of the circulation fan, and is allowed to pass through the mist removal filter and the solvent removal filter. It is characterized by having done.

[0008] The circulation type painting booth apparatus is preferably
The present invention is applied to painting of an automobile body, and in this case, the painting booth is configured so that an automobile can enter and exit.

In each of the circulation type painting booth devices,
It is preferable that the air supply fan blows air into the painting booth substantially downward. Further, it is preferable that the direction of air blown into the painting booth by operating the air supply fan is variable. In this case, it is preferable that a tiltable louver is provided below the air supply filter, and that the direction of air flow can be easily changed by adjusting the tilt of the louver.

[0010] In each of the circulation type painting booth devices,
The mist removal filter is composed of a primary filter with a coarse mesh that removes relatively large paint mist and a secondary filter with a fine mesh that removes paint mist smaller than that, and the air that has passed through the secondary filter is , So as to pass through the solvent removal filter configured as an activated carbon filter, and so that the activated carbon dust generated in the activated carbon filter is removed by the dust removal filter,
It is preferable that air purified by passing through the dust removal filter is introduced into the blow-out chamber by operating the circulation fan.

In the circulation type coating booth apparatus, the activated carbon filter is formed in a wide plate shape in the front-rear direction, and a plurality of the activated carbon filters are arranged side by side over substantially the entire width in the left-right direction of the primary filter. It is preferable that the air passing between the activated carbon filter rows in the installed state be rectified.

In each of the circulation type painting booth apparatuses, the blow-out chamber is provided on the rear side except for the front part of the ceiling, and the air supplied into the painting booth is provided below the suction chamber. The suction may be configured to be drawn into the suction chamber through the side portions, so that an obliquely downward airflow from the ceiling toward the suction chamber is generated.

[0013]

Embodiments of the present invention will be described below with reference to the drawings. Referring to FIG. 1, a circulation type painting booth apparatus 1 according to the present invention is applied as a simple type of dedicated automobile apparatus for partially painting an automobile body, and is provided at a front portion of a painting booth 3 configured so that an automobile 2 can enter and exit. A suction chamber 6 is provided, and a ceiling 7 of the painting booth 3 is provided.
Is provided with a blow-out chamber 9, and an air supply chamber 10 is provided at the rear upper portion of the painting booth 3. And the ceiling 7
As shown in FIGS. 1 and 3 and 4, the front plate 12 is disposed at the upper end of the front plate 12 erected on the floor surface 11 so as to extend rearward in parallel with the floor surface 11. And is suspended from the ceiling of the factory building via suspension bolts (not shown).

The left and right sides 16, 16 of the space 15 below the ceiling 7 are, for example, as shown in FIGS.
Opening / closing body 18, 1 composed of 18a2, 19a1, 19a2
9 and can be opened and closed, and the rear portion 17 of the space 15
It can be opened and closed by the opening and closing body 20 composed of the same curtain 20a as described above. These curtains 18a1, 18a
3, 19a1, 19a2, and 20a are lower surfaces 7 of the left and right edges and the rear edge of the ceiling 7 as shown in FIGS.
It is opened and closed by being guided by a curtain rail 21 (FIGS. 3 and 5) which is arranged continuously to the position a. As shown in FIG. 5 and FIGS. 1 and 2, an upper end 23 a of a hanging piece 23 made of, for example, vinyl chloride is fixed to the lower surface 7 a so as to be located outside the curtain rail 21. The hanging piece 2
Numeral 3 covers the suspended portion 23 of the suspended curtain from outside thereof, and effectively prevents the coating exhaust gas from leaking out of the coating booth from the gap generated in the suspended portion 24.

A bag-like portion 8 is formed at the lower end of these curtains as shown in FIGS. 5 and 6, and a weight W made of, for example, a chain extends in the longitudinal direction of the bag-like portion 8. It is housed as such. A skirt 14 is continuously provided at the lower end of the bag-shaped portion 8, and a lower end portion 14a of the skirt 14 is in close contact with the floor 11 in a bent state as shown in FIG. The closed coating booth 3 can be formed by closing the opening / closing members 18, 19, and 20. By opening the rear opening / closing member 20 as shown in FIG. It is configured so that it can enter and exit the painting booth 3. In FIG. 3, for convenience of explanation,
The opening / closing members 18, 19, 20 and the hanging pieces 22 are omitted, and only the curtain rail 21 is shown. In FIG. 4, the curtain is omitted.

The suction chamber 6 sucks the coating exhaust gas generated in the coating booth 3 through the mist removal filter 22, and as shown in FIGS. 1, 3-4 and 8-9, the front panel It is formed in a rectangular parallelepiped box shape protruding forward with 12 as a rear surface portion 24. The length of the rear surface 24 in the left-right direction is set slightly smaller than the length of the front plate 12 in the left-right direction, and the upper surface 25 of the suction chamber 6 is positioned slightly below the ceiling 7. I have. Also, the left and right sides of the upper portion of the rear surface portion 24 of the suction chamber 6 having such a configuration are closed by cover plates 26, 26, and the central portion of the upper portion is closed by a cover plate 27. An inspection port 29 is provided, and a lower portion of the rear surface portion 24 is a suction port 30. In the present embodiment, the suction port 30 is divided into three sections in the left-right direction, and a filter plate 32 is detachably attached to each section 31. The filter plate 32 is provided with a primary filter 33 (a component of the mist removal filter 22) having a coarse mesh for removing a relatively large portion of excess paint mist generated in the paint booth 3. I have.

As shown in FIG. 1 and FIGS. 8 to 9, a first partition 35 is provided on the floor 11 so as to be located slightly in front of the rear surface 24, and the first partition 35 is provided on the floor 11.
And the upper edge of the suction port 30 are closed by a closing plate 37. An opening 39 is provided in a lower portion of the partition 35, and the opening 39 is divided into five in the left-right direction. A filter plate 41 is detachably attached to each section, and the filter plate 41 has a secondary filter 42 with a fine mesh that removes a relatively small portion of the extra paint mist in the paint booth 3. Another component of the mist removal filter 22) is provided.

A second partition 43 is erected on the floor 11 so as to be located slightly in front of the filter plate 41. As shown in FIG. 9, an upper end of the second partition 43 is connected to the upper end of the second partition 43. The upper edge of the opening 39 of the first partition 35 and the cover plate 4
It is closed at 7. The second partition 43 has an opening 44 partitioned in the left-right direction into, for example, 36. Each partition 48 removes an organic solvent component contained in the air that has passed through the secondary filter 42. Activated carbon filter 50 containing activated carbon and having a wide plate shape in the front-rear direction.
The two organic solvent removal filters 50 as a are shown in FIGS.
As shown in FIG. 10, they are arranged side by side so as to present a V-shape that opens later and closes forward, and both front ends 49, 49 are supported by receiving columns 51, and each organic solvent removal filter 50a is detachable. . Then, the organic solvent removal filter 50 provided side by side is provided.
A cover plate 52 is provided so as to cover the entire upper portion of the filter, and air flowing from the rear side between two adjacent organic solvent removal filters 50, 50 combined in a V-shape is upwardly moved by the cover plate 52. Is stopped, and flows only forward through the filter 50, as indicated by the arrow in FIG.

As shown in FIGS. 1 and 9, a third partition 52 is horizontally disposed with the activated carbon filter 50a positioned slightly above a portion where the activated carbon filters 50a are arranged side by side. 52 is divided into three in the left-right direction. In each section 53, a filter plate 55 for removing activated carbon dust contained in the air that has passed through the activated carbon filter 50a in the forward direction is detachably attached. , The activated carbon filter 50a
A dust removal filter 56 is provided for removing activated carbon dust contained in air passing through the filter.

As shown in FIGS. 1 and 11, a circulating fan 57 having, for example, a sirocco fan is disposed above the third partition 52, and the left and right suction ports 5 are provided.
8 and 58 are disposed in the suction chamber 6, and the exhaust port 59 is open at the upper surface 25 of the suction chamber 6. The outlet 59 is connected to the front end of the blow-out chamber 9 via a duct 60. An exhaust damper 61 for discharging excess air to the outside (in the present embodiment, inside the factory building) is connected to an intermediate portion of the duct 60.

As shown in FIGS. 1, 3 and 12, the ceiling 7 has lighting fixture mounting portions 62, 62 on the left and right sides, and a central portion having a large vertical thickness and extending in the front-rear direction. It is formed as a long cavity 63. The hollow part 6
As shown in FIG. 12 in which the ceiling cover plate 64 of FIG. 1 and FIG. 2 is removed and shown in FIG. 3, the rear side is divided into two by a partition plate 65, and the front cavity portion is formed by the blowing chamber 9.
On the other hand, the hollow portion on the rear side constitutes the air supply chamber 10. The length in the front-rear direction of the blowing chamber 9 is, for example, 3800.
mm, and the front and rear length of the air supply chamber 10 is set to, for example, about 800 mm. As shown in FIG. 3, the left and right lighting fixture mounting portions 62 are provided with three lighting fixtures 66 in the front-rear direction on the lower surface side.

The lower surface of the ceiling portion 7 is substantially
The third part 67 is blindly formed and the rear part 6
Reference numeral 9 has six sections divided into two in the front-rear direction and three in the left-right direction, and a filter plate 71 is detachably attached to each section. And the filter plate 71
Is provided with a blowout filter 72 for the purpose of finally removing dust introduced into the blowout chamber 9 and making the supply of air into the coating booth 3 uniform.

As shown in FIG. 1 and FIGS. 2 to 4, outside air inlets 75 and 76 with filters for taking in fresh air are provided on the upper surface and the rear surface of the air supply chamber 10. The lower surface of the air chamber 10 is divided into two in the left-right direction, and a filter plate 80 is detachably attached to each section. The filter plate 80 is provided with an air supply filter 81 for the purpose of further removing the taken-in outside air and making the supply of air into the coating booth 3 uniform.

The interior of the air supply chamber 10 is shown in FIGS.
As shown in FIG. 7, an air supply fan 82 is provided at a mounting opening provided at the center in the left-right direction while being divided into two by an inclined plate 77. The angle of the downward inclination to is set to about 15 degrees.

However, in the case of the coating booth apparatus 1 having such a configuration, as shown in FIG.
To open the car 2 in the painting booth 3, and then close the rear opening / closing body 20 as shown in FIGS. When the circulation fan 57 is operated in this state, clean air is introduced into the blow-off chamber 9, and the introduced air is further dust-removed by the blow-off filter 72, and the air flow of the blow-off filter 72 is made uniform. As a result, the air is blown from each part on the lower surface of the blowing chamber 9 into the coating booth 3 with a substantially uniform air volume as shown by an arrow in FIG. At the same time, the operation of the air supply fan 82 causes the outside air inlet 7 to operate.
The outside air is sucked into the air supply chamber 10 through the filters 5 and 76, and the dust is gradually reduced through the air supply filter 81 of the air supply chamber 10, and the dust is directed downward into the painting booth 3 as indicated by an arrow in FIG. To blow out. Since the air supply filter 81 is provided over the entire lower surface of the air supply chamber 10, fresh air is supplied from each part of the lower surface of the air supply chamber 10 at a substantially uniform air volume by the air volume equalizing action of the air supply filter 81. Air is the painting booth 3
It will be blown out inside. And the air supply fan 8
2 is slightly inclined downward toward the front as shown in FIG. 1, and the direction of the blowout is slightly inclined downward toward the front as shown by the arrow in FIG. )
The supplied air quickly moves the excess coating mist generated on the rear side of the coating booth 3 downward. The introduction of outside air by the air supply fan 82 can set the air pressure in the painting booth 3 to a positive pressure.

The air supplied from the blowing chamber 9 and the air supply chamber 10 to the interior of the painting booth 3 flows into the suction chamber 6 in the state shown by the arrow in FIG. It is sucked.

The circulation fan 57 is stronger than the air supply fan 82. The circulation fan has an air volume of, for example, 186 cubic meters per minute, whereas the air supply fan has, for example, an air volume of 186 cubic meters per minute. It has an air volume of 33 cubic meters. Therefore, the operation of the air supply fan 82 does not hinder the air circulation due to the operation of the circulation fan 57.

The circulation fan 57 and the air supply fan 8
The spray mist is sprayed on the part to be painted of the car body while the 2 is operated in this way, and the painting is applied.
Since the air supplied from the blowing chamber 9 into the coating booth 3 is purified, the safety of the coating operation can be ensured. In particular, when performing a painting operation on the rear side 89 of the painting booth 3, the air is blown downward from the air supply chamber 10, thereby moving the excess painting mist generated downward and causing the painting mist to soar. Can be prevented. The paint mist is moved, for example, below the waist of the worker so that the worker does not easily suck the paint mist. Of course, the air blown out in this way is fresh outside air, so that the painting operation can be performed while further securing health safety.

If the air supply fan 82 is not provided, the circulation of air in the painting booth 3 will be achieved, but a stagnation portion of the air will be generated on the rear side 89 of the painting booth. And the density of the organic solvent in that portion is increased. As a result, it is inevitable that the front side 90 of the painting booth 3 must be used as a painting work place. The rear side 89 of the painting booth where
It can be a better painting work place.

Further, since the coating mist can be moved downward as described above, the scattered coating mist can be prevented from adhering to the coating surface, and the coating quality can be improved.

Since the air pressure in the coating booth 3 becomes a positive pressure, the blow-off filter 72 and the air supply filter 81
When air from other sources flows into the coating booth 3, it is possible to prevent dust and dust from entering the coating booth, and therefore, it is possible to prevent a decrease in coating quality due to the adhesion of these.

Then, the blowing chamber 9 and the air supply chamber 10
The air supplied into the coating booth 3 from is moved toward the mist removal filter 22 in the suction chamber 6 by the suction action of the circulation fan 57. This movement occurs because air is blown downward from the air supply chamber 10 by the operation of the air supply fan 82, so that the rear side 89
Without causing stagnation of air. In particular, the air supplied from the suction chamber 19 moves downward to the knee position of the worker as shown by an arrow in FIG. 1, for example, and then bends into an L shape along the floor surface 11. Move toward 6.

In the suction chamber 6, the relatively large paint mist is removed by the primary filter 33 and the smaller paint mist is removed by the secondary filter 4.
Removed at 2. At this time, the coating mist can be captured in a substantially uniform state over substantially the entire surface of the primary filter 33 and substantially the entire surface of the secondary filter 42 by the rectifying action of the air provided by the parallel arrangement of the activated carbon filters 50a, thereby removing the coating mist. It will be performed efficiently.

The organic solvent component contained in the air that has passed through the mist removal filter 22 is purified by passing through the solvent removal filter 50, which is the activated carbon filter 50a, in the direction indicated by the arrow in FIG. . In the present embodiment, it is preferable to use an activated carbon filter 50a capable of removing at least about 95% of the contained organic solvent component. The air thus purified is then passed through the dust removal filter 56 as shown in FIGS.
Pass as shown by the arrow. By this passage, the activated carbon dust generated in the activated carbon filter 50a can be removed. The air further purified by passing through the dust removal filter 56, as indicated by the arrow in FIG.
The air flows into the suction chamber 58 through the exhaust port 59 and is introduced into the outlet chamber 9 through the duct 60. In order to prevent the pressure inside the coating booth 3 from being unnecessarily increased due to the supply of outside air from the air supply chamber 10, excess air is supplied to the outside via the exhaust damper 61 as shown by an arrow in FIG. Released. As a result, most of the exhaust gas sucked in the suction chamber 6 is returned to the blowing chamber 9, and only the surplus air is only discharged to the outside. Therefore, the discharge to the outside can be suppressed to the minimum. In addition, the paint mist is almost completely removed by the primary filter 33 and the secondary filter 42, and most of the organic solvent component is removed by the activated carbon filter 50a.
6 removes most of the activated carbon dust, so that there is almost no influence of the pollution by the exhaust gas discharged from the exhaust damper 61 to the outside.

The purified air introduced into the blowing chamber 9 passes through the blowing filter 72 and is blown downward into the coating booth 3. This blowing is performed by further removing the coating mist and the like that have not been removed in the previous steps by the blowing filter 72, and the blowing filter 72 removes the air from the respective parts on the lower surface of the blowing chamber 9 by the air volume equalizing action. Purified air is blown into the painting booth 3 in a substantially uniform state.

As described above, the rear side 89 of the painting booth 3
(Fig. 1) is a good painting work place, so when the rear part of the car body is the part to be painted, the car 2 is advanced into the painting booth 3 and conversely, the front part of the car body is the part to be painted. In such a case, it is preferable to put the automobile 2 into the painting booth 3 with a bag.

The primary filter 33, the secondary filter 42, the activated carbon filter 50a, the dust removal filter 5
6. Since the blowout filter 72 and the air supply filter 81 are all detachable as described above, the maintenance of the apparatus can be performed satisfactorily. The activated carbon filter is
By performing the reproduction process, it can be used repeatedly.

[Other Embodiments] (1) The coating booth apparatus according to the present invention requires a louver 83 which can be tilted in a vertical plane below the air supply filter 81 as shown in FIG. In some cases, a louver device 78 that is arranged side by side at intervals is provided, and the blowing direction of the air blown from the air supply filter 81 into the coating booth 3 may be changed according to the coating conditions. In FIG. 13, solid arrows and dashed-dotted arrows indicate different air blowing directions. For example, when the part to be painted on the automobile body is slightly forward, the louver 83 is moved to the position shown in FIG.
By tilting the paint mist forward as shown by the dashed line, the paint mist generated at that portion can be efficiently moved downward.

(2) The filter in the coating booth apparatus according to the present invention may omit the dust removal filter when the solvent removal filter is not an activated carbon filter.

(3) The coating booth device according to the present invention can be applied to coating other than automobiles.

(4) The coating booth device according to the present invention can be applied not only to coating of automobile bodies but also to coating of various articles such as woodwork products and plastic products.

[0042]

According to the coating booth apparatus of the present invention, the air pollution can be prevented by properly purifying and circulating the coating exhaust gas generated in the coating booth. By appropriately introducing outside air, it is possible to improve the safety of painting work and the painting quality. This will be specifically described below.

(1) In the coating booth apparatus according to the present invention, an air supply chamber is provided in the upper part on the rear side of the coating booth, and an air supply fan is provided in the air supply chamber. It is configured to blow down the paint booth downward through the air supply filter and move the excess paint mist generated on the rear side of the paint booth downward. By preventing the exhaust gas from being generated, almost all of the coating exhaust gas generated in the coating booth can be smoothly moved to the suction chamber, and the coating exhaust gas can be efficiently purified.

(2) With the coating booth apparatus according to the present invention, since the air supplied from the blowing chamber into the coating booth is purified, the safety of the coating operation can be ensured. In addition, the present invention provides an air supply chamber in the upper part on the rear side of the painting booth, so when performing painting work on the rear side of the painting booth,
By the air blown out from the air supply chamber, the generated excess paint mist is moved downward, so that it can be prevented from flying up. Of course, since the air blown out is fresh outside air, the painting operation can be performed while further securing health safety. Further, as described above, since the coating mist can be moved downward, the scattered coating mist can be prevented from adhering to the coating surface, and the coating quality can be improved. In addition, since the air pressure in the painting booth becomes a positive pressure, it is possible to prevent dust and dirt from entering the painting booth by air entering from outside the outlet filter and the air supply filter entering the painting booth. ,
Therefore, it is possible to prevent a decrease in coating quality due to the adhesion of these components.

(3) In the coating booth apparatus according to the present invention, when the direction of air blown into the coating booth by operating the air supply fan is made variable by a louver device or the like, the coating conditions in the coating booth must be adjusted. The wind direction can be changed accordingly. For example, when the part to be painted on the automobile body is slightly forward, the wind direction can be inclined forward to move the generated paint mist downward.

(4) The mist removal filter provided in the suction chamber is composed of a primary filter having a coarse mesh for removing a relatively large paint mist and a secondary filter having a fine mesh for removing a paint mist smaller than that. When the air passing through the secondary filter is made to pass through a solvent removal filter as an activated carbon filter, and the activated carbon dust generated in the activated carbon filter is removed by the dust removal filter, the coating exhaust gas is used. Purification process can be performed more reliably, and even if surplus exhaust gas is released to the atmosphere, air pollution can be prevented and purified air can be supplied into the painting booth, ensuring the safety and quality of painting work. Can be improved. In this case, particularly, the activated carbon filter is formed in a wide plate shape in the front-rear direction, and a plurality of the activated carbon filters are arranged in parallel over substantially the entire width in the left-right direction of the primary filter, and air passing between the arranged activated carbon filter rows is arranged. When rectification is performed, the coating mist can be captured in a substantially uniform state over substantially the entire surface of the primary filter and substantially the entire surface of the secondary filter, and the efficiency of removing the coating mist can be improved.

(5) Except for the front part of the ceiling part, the blow-off chamber is provided further behind the ceiling part, and the air supplied into the painting booth flows through the lower part of the suction chamber through the suction chamber. When it is configured to be sucked into the suction chamber, a natural oblique airflow from the ceiling to the suction chamber can be formed, and the coating exhaust gas in the coating booth can be efficiently sucked in the suction chamber.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a circulation type painting booth apparatus according to the present invention together with its operation.

FIG. 2 is an overall perspective view thereof.

FIG. 3 is a perspective view showing a configuration of a suction chamber and a ceiling.

FIG. 4 is a perspective view showing a configuration of a suction chamber and a ceiling.

FIG. 5 is a cross-sectional view illustrating a suspended state of a curtain, with an intermediate portion omitted.

FIG. 6 is a partial perspective view showing a bag-like portion provided in a lower portion of the curtain together with a stored weight.

FIG. 7 is a perspective view showing a state where a rear opening / closing body is opened.

FIG. 8 is a partially cutaway perspective view illustrating the configuration of a suction chamber.

FIG. 9 is a partially cutaway perspective view showing a configuration of a suction chamber.

FIG. 10 is a cross-sectional view illustrating an action of removing an organic solvent component by an activated carbon filter.

FIG. 11 is an explanatory diagram showing a flow state of air in a suction chamber accompanying operation of a circulation fan.

FIG. 12 is a perspective view illustrating the structure of a ceiling.

FIG. 13 is a cross-sectional view illustrating a louver device.

[Description of Signs] 1 Circulation type painting booth device 2 Automobile 3 Painting booth 6 Intake room 7 Ceiling 9 Blow-out room 10 Air supply room 11 Floor surface 18 Opening / closing body 19 Opening / closing body 20 Opening / closing body 22 Mist removal filter 33 Primary filter 42 2 Next filter 50 Organic solvent removal filter 50a Activated carbon filter 56 Dust removal filter 57 Circulation fan 72 Blow-off filter 81 Air supply filter 82 Air supply fan ────────────────────── ───────────────────────────────

[Procedure amendment]

[Submission date] January 15, 2002 (2002.1.1
5)

[Procedure amendment 1]

[Document name to be amended] Statement

[Correction target item name] Full text

[Correction method] Change

[Correction contents]

[Document Name] Statement

[Title of the Invention] Circulation type painting booth device for automobile

[Claims]

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a method of purifying a coating exhaust gas generated in a coating booth, appropriately circulating the exhaust gas, and supplying outside air into the booth from the upper rear portion of the coating booth. BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a circulation type painting booth device which can prevent contamination, enables high-quality painting, and ensures the safety of painting work.

[0002]

2. Description of the Related Art A conventional painting booth apparatus for painting a portion to be painted of an automobile body in a painting booth in which a car can enter and exit is provided by forcibly supplying and exhausting air to a painting booth. Exhaust paint mist caused by painting was released to the atmosphere by exhaust,
There is a problem that an organic solvent component and the like contained in the coating exhaust gas cause air pollution, and in some cases, residents in the vicinity have been required to relocate the coating facility.

In view of the above, a circulating coating booth apparatus has been proposed in Japanese Patent Application Laid-Open No. 57-75121, in which the coating exhaust gas is purified as required and circulated. This circulation type coating booth device sends outside air removed by a filter into the coating booth, and removes coating mist and organic solvent components contained in coating exhaust gas discharged from the coating booth. After purification, the purified air was returned to the painting booth to circulate exhaust gas.

[0004]

The above-mentioned publications disclose the basic technology of introducing outside air into a coating booth and purifying and circulating coating exhaust gas as required. How to introduce outside air for efficient circulation, how to introduce outside air to improve the safety of painting work in the painting booth, and further improve painting quality There is no description on how to introduce outside air for this purpose.

[0005] Therefore, there is room for further improvement in the conventional circulation type painting booth apparatus for practical use.

[0006] The present invention has been developed in view of the above-mentioned problems of the conventional apparatus, and it is possible to prevent air pollution by properly purifying and circulating coating exhaust gas, as well as to prevent the coating exhaust gas from entering the coating booth. It is an object of the present invention to provide a circulation type painting booth apparatus that can improve the safety of painting work and the quality of painting by appropriately introducing outside air.

[0007]

In order to solve the above-mentioned problems, the present invention employs the following means. That is, the circulation type painting booth device for an automobile according to the present invention is provided with a suction chamber at a front portion of a closed painting booth configured to allow a car to enter and exit, and a ceiling portion of the painting booth at a rear side. An air supply chamber is provided, and a blowing chamber is provided in front of the air supply chamber. Further, the suction chamber, a mist removal filter for removing excess coating mist generated in the coating booth, a solvent removal filter for removing the organic solvent component contained in the air that has passed through the mist removal filter, A part of the air purified by passing through the solvent removing filter is released to the outside and the remaining air is introduced into the blowing chamber, and the introduced air is blown downward into the coating booth through the blowing filter. A circulation fan is provided, and in the air supply chamber, the sucked outside air is blown through the air supply filter toward substantially below the coating booth,
An air supply fan is provided to move the excess paint mist generated on the rear side of the painting booth downward, and the outside air supply from the air supply fan increases the air pressure in the painting booth to positive pressure. Has been set to.
Further, the air supplied from the blowing chamber and the air supply chamber into the coating booth is sucked into the suction chamber by the operation of the circulation fan, and is allowed to pass through the mist removal filter and the solvent removal filter. It is characterized by having done.

[0008]

Embodiments of the present invention will be described below with reference to the drawings. In FIG. 1, a circulation type painting booth device 1 according to the present invention is a device for a simple type automobile for partially painting an automobile body. 6 is provided, and a blowing chamber 9 is provided in a ceiling portion 7 of the coating booth 3, and an air supply chamber 10 is provided in an upper rear portion of the coating booth 3.
Is provided. The ceiling 7 is shown in FIGS.
As shown in FIGS. 1 to 4, at the upper end of the front panel 12 erected on the floor 11, it is disposed so as to extend rearward in parallel with the floor 11 and is formed to have the same width as the front panel 12. It is suspended from the ceiling of the factory building via suspension bolts (not shown).

The left and right sides 16, 16 of the space 15 below the ceiling 7 are, for example, as shown in FIGS.
Opening / closing body 18, 1 composed of 18a2, 19a1, 19a2
9 and can be opened and closed, and the rear portion 17 of the space 15
It can be opened and closed by the opening and closing body 20 composed of the same curtain 20a as described above. These curtains 18a1, 18a
3, 19a1, 19a2, and 20a are lower surfaces 7 of left and right edges and a rear edge of the ceiling 7 as shown in FIGS.
It is opened and closed by being guided by a curtain rail 21 (FIGS. 3 and 5) which is arranged continuously to the position a. As shown in FIG. 5 and FIGS. 1 and 2, an upper end 23 a of a hanging piece 23 made of, for example, vinyl chloride is fixed to the lower surface 7 a so as to be located outside the curtain rail 21. The hanging piece 2
Numeral 3 covers the suspended portion 23 of the suspended curtain from outside thereof, and effectively prevents the coating exhaust gas from leaking out of the coating booth from the gap generated in the suspended portion 24.

A bag-like portion 8 is formed at the lower end portion of these curtains as shown in FIGS. 5 and 6, and a weight W made of, for example, a chain extends in the longitudinal direction of the bag-like portion 8. It is housed as such. A skirt 14 is continuously provided at the lower end of the bag-shaped portion 8, and a lower end portion 14a of the skirt 14 is in close contact with the floor 11 in a bent state as shown in FIG. The closed coating booth 3 can be formed by closing the opening / closing members 18, 19, and 20. By opening the rear opening / closing member 20 as shown in FIG. It is configured so that it can enter and exit the painting booth 3. In FIG. 3, for convenience of explanation,
Only the curtain rail 21 is shown, omitting the opening / closing members 18, 19, 20 and the hanging piece 22. In FIG. 4, the curtain is omitted.

The suction chamber 6 is for sucking coating exhaust gas generated in the coating booth 3 through a mist removal filter 22. As shown in FIGS. 1, 3 to 4, and 8 to 9, the front panel It is formed in a rectangular parallelepiped box shape protruding forward with 12 as a rear surface portion 24. The length of the rear surface 24 in the left-right direction is set slightly smaller than the length of the front plate 12 in the left-right direction, and the upper surface 25 of the suction chamber 6 is positioned slightly below the ceiling 7. I have. Also, the left and right sides of the upper portion of the rear surface portion 24 of the suction chamber 6 having such a configuration are closed by cover plates 26, 26, and the central portion of the upper portion is closed by a cover plate 27. An inspection port 29 is provided, and a lower portion of the rear surface portion 24 is a suction port 30. In the present embodiment, the suction port 30 is divided into three sections in the left-right direction, and a filter plate 32 is detachably attached to each section 31. The filter plate 32 is provided with a primary filter 33 (a component of the mist removal filter 22) having a coarse mesh for removing a relatively large portion of excess paint mist generated in the paint booth 3. I have.

As shown in FIGS. 1 and 8 to 9, a first partition 35 is provided on the floor 11 so as to be located slightly in front of the rear surface 24, and the first partition 35 is provided on the floor 11.
And the upper edge of the suction port 30 are closed by a closing plate 37. An opening 39 is provided in a lower portion of the partition 35, and the opening 39 is divided into five in the left-right direction. A filter plate 41 is detachably attached to each section, and the filter plate 41 has a secondary filter 42 with a fine mesh that removes a relatively small portion of the extra paint mist in the paint booth 3. Another component of the mist removal filter 22) is provided.

A second partition 43 is erected on the floor 11 so as to be located slightly in front of the filter plate 41. As shown in FIG. 9, an upper end of the second partition 43 is connected to the upper end of the second partition 43. The upper edge of the opening 39 of the first partition 35 and the cover plate 4
It is closed at 7. The second partition 43 has an opening 44 partitioned in the left-right direction into, for example, 36. Each partition 48 removes an organic solvent component contained in the air that has passed through the secondary filter 42. Activated carbon filter 50 containing activated carbon and having a wide plate shape in the front-back direction.
The two organic solvent removal filters 50 as a are shown in FIGS.
As shown in FIG. 10, they are arranged side by side so as to present a V-shape that opens later and closes forward, and both front ends 49, 49 are supported by receiving columns 51, and each organic solvent removal filter 50a is detachable. . Then, the organic solvent removal filter 50 arranged in parallel is provided.
A cover plate 52 is provided so as to cover the entire upper portion of the filter, and air flowing from the rear side between two adjacent organic solvent removal filters 50, 50 combined in a V-shape is upwardly moved by the cover plate 52. Is stopped, and flows only through the filter 50 forward as shown by the arrow in FIG.

As shown in FIGS. 1 and 9, a third partition 52 is disposed horizontally above the portion where the activated carbon filters 50a are arranged side by side in the left-right direction. 52 is divided into three in the left-right direction. In each section 53, a filter plate 55 for removing activated carbon dust contained in the air that has passed through the activated carbon filter 50a in the forward direction is detachably attached. , The activated carbon filter 50a
A dust removal filter 56 is provided for removing activated carbon dust contained in air passing through the filter.

As shown in FIGS. 1 and 11, a circulating fan 57 constituted by, for example, a sirocco fan is positioned above the third partition 52, and the left and right suction ports 5 are provided.
8 and 58 are disposed in the suction chamber 6, and the exhaust port 59 is open at the upper surface 25 of the suction chamber 6. The outlet 59 is connected to the front end of the blow-out chamber 9 via a duct 60. An exhaust damper 61 for discharging excess air to the outside (in the present embodiment, inside the factory building) is connected to an intermediate portion of the duct 60.

As shown in FIGS. 1, 3, and 12, the ceiling 7 has left and right side portions as lighting fixture mounting portions 62, 62, and a central portion having a large vertical thickness and a front-rear direction. It is formed as a long hollow portion 63. The hollow part 6
As shown in FIG. 12 in which the ceiling cover plate 64 of FIG. 1 and FIG. 2 is removed and shown in FIG. 3, the rear side is divided into two by a partition plate 65, and the front cavity portion is formed by the blowing chamber 9.
On the other hand, the hollow portion on the rear side constitutes the air supply chamber 10. The length in the front-rear direction of the blowing chamber 9 is, for example, 3800.
mm, and the front and rear length of the air supply chamber 10 is set to, for example, about 800 mm. As shown in FIG. 3, the left and right lighting fixture mounting portions 62 are provided with three lighting fixtures 66 in the front-rear direction on the lower surface side.

The lower surface of the ceiling portion 7 is substantially
The third part 67 is blindly formed and the rear part 6
Reference numeral 9 has six sections divided into two in the front-rear direction and three in the left-right direction, and a filter plate 71 is detachably attached to each section. And the filter plate 71
Is provided with a blowout filter 72 for the purpose of finally removing dust introduced into the blowout chamber 9 and making the supply of air into the coating booth 3 uniform.

As shown in FIGS. 1 and 2 to 4, the upper and rear surfaces of the air supply chamber 10 are provided with external air inlets 75 and 76 with filters for taking in fresh air. The lower surface of the air chamber 10 is divided into two in the left-right direction, and a filter plate 80 is detachably attached to each section. The filter plate 80 is provided with an air supply filter 81 for the purpose of further removing the taken-in outside air and making the supply of air into the coating booth 3 uniform.

The interior of the air supply chamber 10 is shown in FIGS.
As shown in FIG. 7, an air supply fan 82 is provided at a mounting opening provided at the center in the left-right direction while being divided into two by an inclined plate 77, and the air supply fan 82 is arranged in a forward direction with respect to a vertical line. The angle of the downward inclination to is set to about 15 degrees.

However, when using the coating booth apparatus 1 having such a configuration, as shown in FIG.
To open the car 2 in the painting booth 3, and then close the rear opening / closing body 20 as shown in FIGS. When the circulation fan 57 is operated in this state, clean air is introduced into the blow-off chamber 9, and the introduced air is further dust-removed by the blow-off filter 72, and the air flow of the blow-off filter 72 is made uniform. As a result, the air is blown from each part on the lower surface of the blowing chamber 9 into the coating booth 3 with a substantially uniform air volume as shown by an arrow in FIG. At the same time, the operation of the air supply fan 82 causes the outside air inlet 7 to operate.
The outside air is sucked into the air supply chamber 10 through the filters 5 and 76, and the dust is gradually reduced through the air supply filter 81 of the air supply chamber 10, and the dust is directed downward into the painting booth 3 as indicated by an arrow in FIG. To blow out. Since the air supply filter 81 is provided over the entire lower surface of the air supply chamber 10, fresh air is supplied from each part of the lower surface of the air supply chamber 10 at a substantially uniform air volume by the air volume equalizing action of the air supply filter 81. Air is the painting booth 3
It will be blown out inside. And the air supply fan 8
2 is slightly inclined downward toward the front as shown in FIG. 1, and the direction of the blowout is slightly inclined downward toward the front as shown by the arrow in FIG. )
The supplied air quickly moves the excess coating mist generated on the rear side of the coating booth 3 downward. The introduction of outside air by the air supply fan 82 can set the air pressure in the painting booth 3 to a positive pressure.

The air supplied from the blowing chamber 9 and the air supply chamber 10 to the inside of the painting booth 3 enters the suction chamber 6 in a state shown by an arrow in FIG. It is sucked.

The circulation fan 57 is stronger than the air supply fan 82. The circulation fan has an air volume of, for example, 186 cubic meters per minute, while the air supply fan has, for example, an air volume of 186 cubic meters per minute. It has an air volume of 33 cubic meters. Therefore, the operation of the air supply fan 82 does not hinder the air circulation due to the operation of the circulation fan 57.

The circulation fan 57 and the air supply fan 8
The spray mist is sprayed on the part to be painted of the car body while the 2 is operated in this way, and the painting is applied.
Since the air supplied from the blowing chamber 9 into the coating booth 3 is purified, the safety of the coating operation can be ensured. In particular, when performing a painting operation on the rear side 89 of the painting booth 3, the air is blown downward from the air supply chamber 10, thereby moving the excess painting mist generated downward and causing the painting mist to soar. Can be prevented. The paint mist is moved, for example, below the waist of the worker so that the worker does not easily suck the paint mist. Of course, since the air blown out is fresh outside air, the painting operation can be performed while further securing health safety.

If the air supply fan 82 is not provided, the circulation of air in the painting booth 3 will be achieved, but a stagnation portion of air will be generated on the rear side 89 of the painting booth. And the density of the organic solvent in that portion is increased. As a result, it is inevitable that the front side 90 of the painting booth 3 must be used as a painting work place. The rear side 89 of the painting booth where
It can be a better painting work place.

Further, since the coating mist can be moved downward as described above, the scattered coating mist can be prevented from adhering to the coating surface, and the coating quality can be improved.

Further, since the air pressure in the coating booth 3 becomes a positive pressure, the blowing filter 72 and the air supply filter 81
When air from other sources flows into the coating booth 3, it is possible to prevent dust and dust from entering the coating booth, and therefore, it is possible to prevent a decrease in coating quality due to the adhesion of these.

Then, the blowing chamber 9 and the air supply chamber 10
The air supplied into the coating booth 3 from is moved toward the mist removal filter 22 in the suction chamber 6 by the suction action of the circulation fan 57. This movement occurs because air is blown downward from the air supply chamber 10 by the operation of the air supply fan 82, so that the rear side 89
Without causing stagnation of air. In particular, the air supplied from the suction chamber 19 moves downward to the knee position of the worker as shown by an arrow in FIG. 1, for example, and then bends into an L shape along the floor surface 11. Move toward 6.

In the suction chamber 6, the relatively large paint mist is removed by the primary filter 33 and the smaller paint mist is removed by the secondary filter 4.
Removed at 2. At this time, the coating mist can be captured in a substantially uniform state over substantially the entire surface of the primary filter 33 and substantially the entire surface of the secondary filter 42 by the rectifying action of the air provided by the parallel arrangement of the activated carbon filters 50a, thereby removing the coating mist. It will be performed efficiently.

The organic solvent component contained in the air that has passed through the mist removal filter 22 is purified by passing through the solvent removal filter 50, which is the activated carbon filter 50a, in the direction indicated by the arrow in FIG. . In the present embodiment, it is preferable to use an activated carbon filter 50a capable of removing at least about 95% of the contained organic solvent component. The air thus purified is then passed through the dust removal filter 56 as shown in FIGS.
Pass as shown by the arrow. By this passage, the activated carbon dust generated in the activated carbon filter 50a can be removed. The air further purified by passing through the dust removal filter 56, as indicated by the arrow in FIG.
The air flows into the suction chamber 58 through the exhaust port 59 and is introduced into the outlet chamber 9 through the duct 60. In order to prevent the pressure inside the coating booth 3 from being unnecessarily increased due to the supply of outside air from the air supply chamber 10, excess air is supplied to the outside via the exhaust damper 61 as shown by an arrow in FIG. Released. As a result, most of the exhaust gas sucked in the suction chamber 6 is returned to the blowing chamber 9, and only the surplus air is only discharged to the outside. Therefore, the discharge to the outside can be suppressed to the minimum. In addition, the paint mist is almost completely removed by the primary filter 33 and the secondary filter 42, and most of the organic solvent component is removed by the activated carbon filter 50a.
6 removes most of the activated carbon dust, so that there is almost no influence of the pollution by the exhaust gas discharged from the exhaust damper 61 to the outside.

The purified air introduced into the blowing chamber 9 is blown downward into the coating booth 3 through the blowing filter 72. This blowing is performed by further removing the coating mist and the like that have not been removed in the previous steps by the blowing filter 72, and the blowing filter 72 removes the air from the respective parts on the lower surface of the blowing chamber 9 by the air volume equalizing action. Purified air is blown into the painting booth 3 in a substantially uniform state.

As described above, the rear side 89 of the painting booth 3
(Fig. 1) is a good painting work place, so when the rear part of the car body is the part to be painted, the car 2 is advanced into the painting booth 3 and conversely, the front part of the car body is the part to be painted. In such a case, it is preferable to put the automobile 2 into the painting booth 3 with a bag.

The primary filter 33, the secondary filter 42, the activated carbon filter 50a, the dust removal filter 5
6. Since the blowout filter 72 and the air supply filter 81 are all detachable as described above, the maintenance of the apparatus can be performed satisfactorily. The activated carbon filter is
By performing the reproduction process, it can be used repeatedly.

When the solvent removing filter is not an activated carbon filter, the filter in the coating booth apparatus according to the present invention may omit the dust removing filter.

[0034]

According to the coating booth apparatus of the present invention, the air pollution can be prevented by properly purifying and circulating the coating exhaust gas generated in the coating booth. By appropriately introducing outside air, it is possible to improve the safety of painting work and the painting quality. This will be specifically described below.

(1) In the coating booth apparatus according to the present invention, an air supply chamber is provided in the upper part on the rear side of the coating booth, and an air supply fan is provided in the air supply chamber. It is configured to blow out almost directly below the paint booth through the air supply filter and move excess paint mist generated at the rear of the paint booth in the downward direction. Is prevented, almost all of the coating exhaust gas generated in the coating booth can be smoothly moved to the suction chamber, and the coating exhaust gas can be efficiently purified.

(2) With the coating booth apparatus according to the present invention, since the air supplied from the blowing chamber into the coating booth is purified, the safety of the coating operation can be ensured. In addition, the present invention provides an air supply chamber in the upper part on the rear side of the painting booth, so when performing painting work on the rear side of the painting booth,
By the air blown out from the air supply chamber, the generated excess paint mist is moved downward, so that it can be prevented from flying up. Of course, since the air blown out is fresh outside air, the painting operation can be performed while further securing health safety. Further, as described above, since the coating mist can be moved downward, the scattered coating mist can be prevented from adhering to the coating surface, and the coating quality can be improved. In addition, since the air pressure in the painting booth becomes a positive pressure, it is possible to prevent dust and dirt from entering the painting booth by air entering from outside the outlet filter and the air supply filter entering the painting booth. ,
Therefore, it is possible to prevent a decrease in coating quality due to the adhesion of these components.

[Brief description of the drawings]

FIG. 1 is a sectional view showing a circulation type painting booth apparatus according to the present invention together with its operation.

FIG. 2 is an overall perspective view thereof.

FIG. 3 is a perspective view showing a configuration of a suction chamber and a ceiling.

FIG. 4 is a perspective view showing a configuration of a suction chamber and a ceiling.

FIG. 5 is a cross-sectional view illustrating a suspended state of a curtain, in which an intermediate portion is omitted.

FIG. 6 is a partial perspective view showing a bag-like portion provided in a lower portion of the curtain together with a stored weight.

FIG. 7 is a perspective view showing a state where a rear opening / closing body is opened.

FIG. 8 is a partially cutaway perspective view illustrating the configuration of a suction chamber.

FIG. 9 is a partially cutaway perspective view showing a configuration of a suction chamber.

FIG. 10 is a cross-sectional view illustrating an action of removing an organic solvent component by an activated carbon filter.

FIG. 11 is an explanatory diagram showing a flow state of air in a suction chamber accompanying operation of a circulation fan.

FIG. 12 is a perspective view illustrating the structure of a ceiling.

[Description of Signs] 1 Circulation type painting booth device 2 Automobile 3 Painting booth 6 Intake room 7 Ceiling 9 Blow-out room 10 Air supply room 11 Floor surface 18 Opening / closing body 19 Opening / closing body 20 Opening / closing body 22 Mist removal filter 33 Primary filter 42 2 Next filter 50 Organic solvent removal filter 50a Activated carbon filter 56 Dust removal filter 57 Circulation fan 72 Blow-off filter 81 Air supply filter 82 Air supply fan

[Procedure amendment 2]

[Document name to be amended] Drawing

[Correction target item name] FIG.

[Correction method] Deleted

Claims (8)

[Claims] 1. A suction chamber is provided in front of a closed coating booth, a blowing chamber is provided in a ceiling portion of the coating booth, and an air supply chamber is provided in an upper portion on a rear side of the coating booth. The suction chamber includes a mist removal filter for removing excess paint mist generated in the painting booth, and a solvent removal for removing an organic solvent component contained in air passing through the mist removal filter. A filter and a part of the air purified by passing through the solvent removing filter is released to the outside and the remaining air is introduced into the blowing chamber, and the introduced air is directed downward into the coating booth through the blowing filter. A circulation fan is provided for blowing air to the inside of the coating booth through the air supply filter. An air supply fan adapted to move the paint mist downward is provided, and the outside air supply from the air supply fan sets the air pressure in the paint booth to a positive pressure. The air supplied into the coating booth from the blowing chamber and the air supply chamber is sucked into the suction chamber by the operation of the circulation fan, and is allowed to pass through the mist removal filter and the solvent removal filter. A circulation type painting booth device characterized by the following. 2. A suction chamber is provided at a front portion of a closed painting booth which is configured to allow a car to enter and exit, and a blowing room is provided at a ceiling portion of the painting booth. The upper part is provided with an air supply chamber, and the suction chamber contains a mist removal filter for removing excess coating mist generated in the coating booth, and is contained in air that has passed through the mist removal filter. A solvent removal filter for removing the organic solvent component, and a part of the air purified by passing through the solvent removal filter is released outside, and the remaining air is introduced into the blowing chamber, and the introduced air is blown out. A circulation fan that blows downward through the filter into the coating booth; and, in the air supply chamber, blows the sucked outside air downward through the air supply filter into the coating booth to form a coating fan. An air supply fan is provided to move excess paint mist generated on the rear side of the booth in a downward direction, and the outside air supply from the air supply fan changes the air pressure in the paint booth to a positive pressure. The air supplied from the blowing chamber and the air supply chamber into the painting booth is sucked into the suction chamber by the operation of the circulation fan, and the mist removal filter and the solvent are set. A circulation type painting booth device characterized in that it can be passed through a removal filter. 3. The air supply fan according to claim 1, wherein the air blows the air into the painting booth substantially downward.
Or the circulation type painting booth device according to 2. 4. The circulation type paint booth device according to claim 1, wherein the direction of air blown into the paint booth by the operation of the air supply fan is variable. 5. The air flow direction of air blown into the painting booth by operating the air supply fan is variable by a tiltable louver disposed below the air supply filter. Item 3. A circulation type coating booth device according to item 1 or 2. 6. The mist removal filter comprises a primary filter having a coarse mesh for removing relatively large paint mist and a secondary filter having a fine mesh for removing paint mist smaller than the primary filter. The passed air is passed through the solvent removal filter configured as an activated carbon filter, and the activated carbon dust generated by the activated carbon filter is removed by the dust removal filter. The circulation type painting booth device according to claim 1 or 2, wherein the air that has passed and purified is introduced into the blowing chamber by operation of the circulation fan. 7. The activated carbon filter is formed in a plate shape that is wide in the front-rear direction, and a large number of the activated carbon filters are arranged over substantially the entire width in the left-right direction of the primary filter. 7. The circulation type painting booth device according to claim 6, wherein the air passing between the rows is rectified. 8. The suction chamber is provided on a rear side except for a front part of the ceiling part, and air supplied into the coating booth passes through a lower part of the suction chamber. The circulation type painting booth apparatus according to claim 1 or 2, wherein the suction is performed so that an obliquely downward airflow from the ceiling toward the suction chamber is generated.