JP5754628B2 - Filter device and painting booth using the filter device - Google Patents

Description

  The present invention relates to a filter device and a painting booth using the filter device.

  In this filter device, basically, an inlet port into which the gas to be treated flows is formed in the device case, and a filter for collecting the sticky substance to be collected contained in the gas to be treated is built in the device case.

  A precoat agent nozzle is disposed at the inlet, and this precoat agent nozzle ejects a powdery filter precoat agent together with gas.

  By this ejection, the powdery precoat agent is mixed with the gas to be treated, and the gas to be treated passes through the filter, whereby a precoat layer (a coating layer made of the precoat agent) is formed on the filter surface. The adhesive substance to be collected is collected on the filter in a state where direct adhesion to the filter surface is prevented by the presence of the precoat layer.

  Conventionally, in the filter device shown in FIG. 1 of Patent Document 1, a simple circular opening or square opening is formed in the forming plate member of the device case as an inflow port, and a precoat agent nozzle is formed in the opening in the device case. It is placed in a posture such as turning. ... (Conventional example 1)

  In the filter device shown in FIG. 1 and FIG. 2 of Patent Document 2, the precoat agent nozzle is disposed in the vicinity of the inlet portion in the device case. ... (Conventional example 2)

  In the painting booth found in FIG. 1 and FIG. 15 of Patent Document 3, the paint mist contained in the exhaust air from the painting chamber is collected by a filter.

In the painting booth shown in FIG. 1 of Patent Document 3 (see FIG. 8), an exhaust chamber 4 that receives exhaust air EA from the painting chamber 2 is disposed below the painting chamber 2.
A pair of guide plates 20 that divide the interior of the exhaust chamber 4 up and down are provided, and a central gap 21 is formed between the leading edges of the guide plates 20.
The central gap 21 is a slit-like gap extending in the booth longitudinal direction (that is, the direction in which the article is conveyed in the painting chamber 2).

The lower region of the exhaust chamber 4 partitioned by the guide plates 20 is a filter chamber. A plurality of filters 8 are arranged in the filter chamber, and these filters 8 are arranged side by side in the booth longitudinal direction.
The precoat agent nozzle 11 is disposed on the lower surface side of the guide plate 20 in the vicinity of the central gap 21, and the precoat agent nozzle 11 ejects the precoat agent P against the exhaust air EA passing through the central gap 21. ... (Conventional example 3)

  In the painting booth shown in FIG. 15 of Patent Document 3 (see FIG. 9), a vertical plate 22 surrounding the filter 8 together with the guide plate 20 is suspended from the front end of each guide plate 20. A bottom gap 23 is formed between the bottom of the chamber 4. This bottom gap 23 is also a slit-like gap extending in the booth longitudinal direction.

  The precoat agent nozzle 11 is disposed on the back side of the vertical plate 22 in the vicinity of the bottom gap 23, and the precoat agent nozzle 11 ejects the precoat agent P against the exhaust air EA passing through the bottom gap 23. ... (Conventional example 4)

  That is, in these coating booths, the precoat agent P is ejected with respect to the high-speed flow of the exhaust air EA passing through the slit-shaped central gap 21 and the bottom gap 23, and the ejected precoat agent P is caused by the high-speed flow of the exhaust air EA. By stirring, the precoat agent P is mixed with the exhaust air EA in a dispersed state.

  As the exhaust air EA mixed with the precoat agent P passes through the filter 8 in this way, a precoat layer is formed on the filter surface, and the paint mist contained in the exhaust air EA moves to the filter surface due to the presence of this precoat layer. Are collected in the filter 8 in a state in which the direct adhesion of is prevented.

JP-A-53-109274 Japanese Utility Model Publication No. 7-37311 Japanese translation of PCT publication No. 2008-536661 JP 2002-336749 A Japanese Utility Model Publication No. 62-109765 Japanese Patent Application No. 2010-78318

  In general, in a filter device, it is often required that the inlet portion has a rectangular or slit-like horizontal flat shape extending in the horizontal width direction.

This is for allowing the gas to be processed flowing in from the inlet port to pass uniformly through the filter in the apparatus case.
Alternatively, the exhaust air from the painting chamber is spread over the entire width of the painting chamber, as in the filter device attached to the painting booth found in Patent Document 4 and the filter device (demister device) attached to the simple painting booth found in Patent Document 5. This is for the purpose of flowing into the filter device uniformly and smoothly.

  However, in this case, as in the above-described conventional example 1 (FIG. 1 of Patent Document 1), the structure in which the precoat agent nozzle is simply disposed in a simple opening portion, or the conventional example 2 (FIG. 1, FIG. 1 of Patent Document 2). In the structure in which the precoat agent nozzle is simply disposed in the vicinity of the inlet in the apparatus case as shown in FIG.

That is, the precoat agent ejected from the precoat agent nozzle is not uniformly dispersed in the lateral width direction of the inlet portion (that is, the longitudinal direction of the inlet portion) with respect to the gas to be processed that passes through the inlet portion extending in the lateral width direction.
For this reason, the distribution of the precoat agent in the gas to be processed that passes through the filter becomes uneven, which causes the formation of the precoat layer in the filter to be poor.

  In order to prevent this uneven distribution of the precoat agent, it is necessary to arrange a large number of precoat agent nozzles at the smallest possible intervals in the lateral width direction (longitudinal direction) of the inlet. However, in this case, there is a problem that the apparatus becomes complicated and the apparatus cost increases.

  On the other hand, the coating booths of Conventional Example 3 and Conventional Example 4 (FIG. 1, FIG. 15) also have the same problem.

  That is, the precoat agent P ejected from the precoat agent nozzle 11 is uniformly dispersed in the booth longitudinal direction (gap longitudinal method) with respect to the exhaust air EA passing through the slit-like central gap 21 and bottom gap 23 extending in the booth longitudinal direction. In order to mix in a state, it is necessary to arrange a large number of precoat agent nozzles 11 at as small intervals as possible in the longitudinal direction of the booth. This also causes a problem that the apparatus becomes complicated and the apparatus cost increases.

  In view of this situation, the main problem of the present invention is to effectively solve the above-described problems by adopting a rational stirring and mixing method for stirring and mixing the jet precoat agent.

The first characteristic configuration of the present invention relating to the filter device is as follows:
In addition to forming an inlet portion into which the gas to be treated flows in the apparatus case, the apparatus case is equipped with a filter that collects an adhesive substance to be collected contained in the gas to be treated.
A precoat agent nozzle that ejects a powdery precoat agent for a filter together with a gas is a filter device arranged at the inlet portion,
The inlet portion is a laterally flat opening extending in the lateral width direction,
A recess for retention having a cross-sectional shape opening downward in the longitudinal direction of the inlet portion is formed in the upper edge portion of the inlet portion continuously in the longitudinal direction of the inlet portion,
The precoat agent nozzle is arranged at a predetermined position in the longitudinal direction of the inflow port portion in a state in which the precoat agent and gas are ejected toward the back of the retention recess,
A diffusion assisting tool for diverting the gas to be processed at the inlet portion to the one side and the other side in the longitudinal direction of the inlet portion, and the precoat agent nozzle in the longitudinal direction of the inlet portion. It is in the point arrange | positioned at the said inflow port part in the vicinity of arrangement | positioning location.

  According to this configuration, by blowing the powdery precoat agent together with the gas from the precoat agent nozzle toward the back of the retention recess, the flow of the gas to be treated at the inlet port is the downward opening of the retention recess. Combined with passing through the vicinity, it is possible to cause a vortex-like residence of the gas accompanied by the jetted precoat agent in the residence recess for an appropriate time. (See Patent Document 6)

  Due to this vortex-like residence, the precoat agent can be diffused from the location where the precoat agent nozzle is disposed in the longitudinal direction (lateral width direction) of the inflow port portion with stirring, in the retention recess that is continuous in the longitudinal direction of the inflow port portion. it can.

  And while diffusing the precoat agent in the longitudinal direction of the inflow port in this way, the diffused precoat agent can be gradually taken into the flow of the gas to be treated in the inflow port from the downward opening of the retention recess. As a result, the precoat agent can be mixed in a uniformly dispersed state in the longitudinal direction of the inlet port with the gas to be processed flowing into the apparatus case from the inlet port.

  In addition, by passing the gas to be processed at the inlet portion to the one side and the other side in the longitudinal direction of the inlet portion with the diffusion assisting tool, the direction of the gas to be processed due to the split flow is changed. In addition, it is possible to further promote the diffusion of the precoat agent in the longitudinal direction (lateral width direction) of the precoat agent in the retention recess as described above, and also in the process of taking the diffused precoat agent from the retention recess into the flow of the gas to be treated. The precoat agent can be further diffused, and these can further promote the mixing of the precoat agent in a uniformly dispersed state with respect to the gas to be treated.

  From these facts, a large number of precoat agent nozzles are juxtaposed in the lateral width direction (longitudinal direction) of the inlet port at small intervals while the inlet port portion is a laterally flat opening extending in the lateral width direction according to various requirements. This can be avoided, and it is sufficient to provide only one precoat agent nozzle for the inlet portion, or even if the precoat agent nozzles are juxtaposed in the lateral width direction of the inlet portion, the juxtaposition interval is increased and juxtaposed. The number can be effectively reduced.

  In the implementation of this configuration, various shapes such as an arc shape and a polygonal shape can be adopted as the specific shape of the retention recess in the longitudinal direction of the inlet port, and the flow rate of the gas to be processed and the material of the precoat agent And so on.

The second characteristic configuration of the present invention relating to the filter device is:
The diffusion assisting tool is in the form of a plate-like body in a vertical posture provided with a plate edge portion having a knife edge structure that is sharpened toward the upper side in the gas passage direction.

  According to this configuration, while the diffusion auxiliary tool effectively avoids the waste gas of the blower power due to a large passage resistance of the gas to be treated, the gas to be treated is disposed on one side and the other side in the longitudinal direction of the inlet portion. Can be smoothly diverted in a state accompanied by a change in direction.

The third characteristic configuration of the present invention relating to the filter device is:
The said diffusion assistance tool exists in the point arrange | positioned only in the upper part side in the said inflow port part.

  According to this configuration, the gas to be processed is diverted in a state with a change in direction due to the presence of the diffusion auxiliary tool on the upper side of the inlet portion, but the target object is processed on the lower side of the inlet portion due to the absence of the diffusion auxiliary tool. The gas can be passed in a uniform and integrated state in the longitudinal direction of the inlet portion, and as a result, the uniformity and integrity in the longitudinal direction of the inlet portion of the gas to be processed as the whole inlet portion can be improved as much as possible. Can be maintained.

  That is, this makes it possible to satisfactorily maintain a state in which the gas to be treated mixed with the precoat agent is uniformly passed through the filter in the apparatus case.

The fourth characteristic configuration of the present invention relating to the filter device is:
The jet port of the precoat agent nozzle is located downstream from the central portion of the retention recess in the gas to be processed passage direction.

  According to this configuration, the vortex-like staying area formed in the staying recess by the ejection of the precoat agent and gas from the precoat agent nozzle is more upstream than the downstream part in the gas passage direction in the staying recess ( That is, a large portion can be formed at the upstream end of the retention recess and the precoat agent nozzle.

  And by this, the part which takes in a precoat agent from the recessed part for a residence with respect to the flow of the to-be-processed gas in an inflow port part as a whole is biased near the upstream end of the recessed part for a residence in a to-be-treated gas passage direction. Therefore, the diffusion of the precoat agent in the gas to be processed in the process of passing through the inlet can be further promoted by this deviation.

The fifth characteristic configuration of the present invention relating to the filter device is:
The diffusion assisting tool is in a point that is disposed closer to the downstream side than the central portion of the retention recess in the gas passage direction.

  According to this configuration, the precoat agent is sufficiently taken into the flow of the gas to be processed from the retention recess at a location upstream of the diffusion assisting tool in the direction of the gas to be processed. The diffusion assisting tool can be made to act on the passing gas to be processed after being taken in.

  That is, the gas to be processed after the pre-coating agent has been sufficiently taken in can be diverted in a state accompanied by a change in direction by the diffusion assisting tool. It is possible to contribute more effectively to the diffusion of the precoat agent therein.

The sixth characteristic configuration of the present invention relating to the filter device is:
The diffusion assisting tool is arranged such that the upper end portion thereof is positioned inside the retention recess.

  According to this configuration, it is possible to cause the diffusion assisting device to perform a shunting action in a state in which the direction of the diffusion assisting device is accompanied as described above, even with respect to the gas that vortexes with the precoat agent in the retention recess. Diffusion of the precoat agent in the longitudinal direction (lateral width direction) of the precoat agent accompanied by stirring in the concave portion for use can be more effectively promoted.

The seventh characteristic configuration of the present invention relating to the filter device is:
The upstream edge of the retention recess in the direction of the gas to be processed is in the form of an upstream drooping wall in a vertical posture.

  According to this configuration, the pre-coating agent and a part of the gas in the diffusion state reaching the upstream end of the retention recess in the direction of the gas to be treated in the vortex retention in the retention recess, the upstream hanging wall in the vertical posture Can be guided downward.

  And, by the downward guide by the upstream drooping wall, the precoat agent can be actively joined to the flow of the gas to be treated at the upstream portion of the inlet portion, and thereby the precoat agent can be joined to the inlet portion. Also in the height direction (short side direction), it can be mixed with the gas to be processed in an effectively dispersed state, and the precoat agent distribution of the gas to be processed that passes through the filter can be made more uniform.

The eighth characteristic configuration of the present invention relating to the filter device is:
The downstream edge portion of the retention recess in the direction of the gas to be processed is that it is a vertical hanging wall in the vertical position.

  According to this configuration, as in the case of the upstream drooping wall, a part of the precoat agent and gas in a diffused state reaching the downstream end of the retention recess in the gas passage direction in the vortex retention in the retention recess Can be guided downward by the vertical hanging wall in the vertical position.

  And, by the downward guide by the downstream side drooping wall, the precoat agent can be actively joined to the flow of the gas to be treated at the downstream portion of the inlet portion, and thereby the precoat agent can be joined to the inlet portion. Also in the height direction (short side direction), it can be mixed with the gas to be processed in an effectively dispersed state, and the precoat agent distribution of the gas to be processed that passes through the filter can be made more uniform.

  In addition, in the seventh or eighth characteristic configuration, when the bottom portion facing the retention recess is formed at the lower edge portion of the inflow port portion, the following effects can also be obtained.

  In other words, the flow of the gas to be processed at the inlet port can be changed to a certain degree in the downward direction by the downward flow formed by the guide by the upstream drooping wall or the downstream drooping wall. On the other hand, a part of the precoat agent taken in from the retention recess can be surely brought to the bottom portion of the inlet portion, and a precoat agent layer can be formed on the bottom portion.

  That is, by forming this precoat agent layer, it is possible to effectively prevent the sticky collection target substance contained in the gas to be treated from adhering to and depositing on the bottom of the inlet portion.

The ninth feature of the present invention relating to the filter device is
The diffusion assisting tool is arranged such that the upper end of the diffusion assisting tool protrudes from the downstream hanging wall into the retention recess in the direction of the gas to be processed.

  According to this configuration, in addition to causing the upper end portion of the diffusion assisting device to perform a shunting action on the gas that vortexes with the precoat agent in the retention recess, the upper end portion of the diffusion assisting device and the base end thereof are positioned. By the corner structure formed by the downstream drooping wall, the diverted gas can be redirected more effectively to one side and the other side in the longitudinal direction of the inlet portion, thereby stirring in the retention recess Can further effectively promote diffusion of the precoat agent in the longitudinal direction (lateral width direction) of the inlet portion.

The tenth characteristic configuration of the present invention relating to the filter device is:
The diffusion assisting tool is in a state where a lower end portion thereof is arranged in a state of extending in the direction of the gas to be processed under the downstream hanging wall.

  According to this configuration, the lower end portion of the diffusion assisting tool extends in the direction of the gas to be processed under the downstream hanging wall, so that the shunting action of the diffusion assisting tool on the gas to be processed at the inlet port can be enhanced. Thus, the diffusion of the precoat agent in the longitudinal direction of the inlet can be further promoted.

The eleventh characteristic configuration of the present invention relating to the filter device is:
The diffusion aid is attached to the precoat agent nozzle.

  According to this configuration, a support member dedicated to the diffusion aid can be eliminated, the internal structure of the inflow port can be simplified, and the diffusion aid can be attached to the precoat agent nozzle in advance. Thus, the diffusion assisting tool and the precoat agent nozzle can be installed in the inflow port portion in a state where the relative positional relationship between the two is appropriately maintained, and the manufacture of the apparatus can be facilitated.

The twelfth feature of the present invention relating to the filter device is
An inclined bottom which faces the retention recess and becomes lower toward the downstream side in the gas passage direction is formed in the lower edge portion of the inlet portion so as to be continuous in the longitudinal direction of the inlet portion. .

  That is, according to this configuration, even if the sticky collection target substance contained in the gas to be treated is deposited on the inclined bottom in a mixed state with the precoat agent, the inclined wall is inclined and the above-described bottom portion is When there is a precoat agent layer, it is possible to quickly remove the mixed deposit to the inside of the device case in combination with the adhesion preventing effect of the precoat agent layer. Can be maintained in good and stable manner.

The thirteenth feature of the present invention relating to the filter device is
The upstream edge portion of the inclined bottom in the direction of the gas to be treated is that the upstream rising wall has a vertical posture rising toward the upstream edge portion of the retention recess.

  According to this configuration, due to the presence of the upstream rising wall that rises toward the upstream edge of the retention recess, the flow velocity of the gas to be processed is reduced on the lower edge side (that is, the inclined bottom side) of the inlet portion. Can be suppressed.

  That is, the flow velocity of the gas to be treated is suppressed by the presence of the retention recess (particularly the presence of the upstream edge of the retention recess) at the upper edge of the inflow port. Even at the lower edge side, the flow velocity of the gas to be treated can be balanced by suppressing the passage velocity of the gas to be treated due to the presence of the rising wall on the upstream side.

  That is, this makes it possible to smoothly and stably maintain the inflow of the gas to be processed into the apparatus case through the inlet and the mixing of the precoat agent with the gas to be processed at the inlet.

  Further, due to the presence of the upstream rising wall, the slanted bottom can also be swirled, so that when the downstream hanging wall is provided, the downstream hanging wall can be guided as described above. By forming the downward flow to be formed, the flow of the gas to be processed is changed obliquely downward to some extent, and a part of the precoat agent taken into the gas to be processed reaches the downstream portion of the inclined wall. The precoat agent reaching the side portion can be spread on the inclined bottom in such a state that the inclined bottom runs up due to the vortex retention on the inclined bottom.

  That is, this makes it possible to stably maintain the precoat agent layer for preventing adhesion formed on the inclined bottom while making the bottom of the inflow port portion an inclined bottom.

The fourteenth feature of the present invention relating to the filter device is
The inlet portion has an upstream opening between an upstream edge portion of the retention recess in the gas to be processed passage direction and an upstream edge portion of the inclined bottom located below, and A cylindrical structure having a downstream opening between a downstream edge portion of the retention recess in the gas to be processed passage direction and a downstream edge portion of the inclined bottom located therebelow,
In this cylindrical structure, the downstream opening is disposed at a position lower than the upstream opening,
The filter is disposed at a position higher than the downstream opening inside the device case.

  According to this configuration, after passing the gas to be processed obliquely downward from the higher upstream opening at the inlet to the lower downstream opening, the direction of the flow is greatly changed from the obliquely downward to the upward flow. It can be passed through a filter higher than the downstream opening of the inlet.

  That is, this large change in direction can further promote the diffusion of the precoat agent mixed with the gas to be processed in the gas to be processed in the process of passing through the inflow port, thereby allowing the gas to be processed to pass through the filter. The precoat agent distribution can be made more uniform.

The fifteenth characteristic configuration of the present invention relating to the filter device is
The retention recess includes an upper bottom wall surface forming an upper bottom portion thereof, a vertical upstream wall located at an upstream end edge of the retention recess in the gas passing direction, and a gas passing direction. An upstream inclined bottom wall surface extending from the upstream end in the gas passage direction of the upper bottom wall and the base end of the upstream drooping wall in an inclined posture that becomes lower toward the upstream side,
In the vicinity of the upstream drooping wall on the upstream inclined bottom wall surface, a diffusion assisting protrusion that protrudes downward into the retention recess is provided, and the downward projecting dimension of the diffusion assisting protrusion is as described above. Smaller than the downward extension of the hanging wall on the upstream side,
The jet port of the precoat agent nozzle is located in a state in which the precoat agent and gas are jetted obliquely upward from the downstream side in the gas passage direction to the upper bottom wall surface.

  According to this configuration, the precoat agent and gas ejected from the precoat agent nozzle are guided by the upper bottom wall surface, the upstream inclined bottom wall surface, and the upstream drooping wall, respectively, so that the vicinity of the downward opening of the retention recess is close. In combination with the flow of the gas to be processed, the above-described vortex-like residence area can be effectively generated in the upstream portion of the residence recess.

  Further, in such an effective generation of the vortex staying region in the upstream portion of the retaining recess, the precoat agent and part of the gas ejected from the precoat agent nozzle are guided under the upstream inclined bottom wall surface. Colliding with the diffusion assisting protrusion, the collision can promote the diffusion of the precoat agent in the longitudinal direction of the inlet.

  That is, the diffusion promotion by the collision can further effectively promote the diffusion of the precoat agent in the longitudinal direction (lateral width direction) of the pre-coating agent in the retention concave portion accompanied by stirring due to the vortex-like retention as described above.

  In the implementation of this configuration, the upper bottom wall surface and the upstream inclined bottom wall surface are not limited to a flat surface, but may be a curved surface in which the cross-sectional shape of the retention recess is an arc.

The sixteenth feature of the present invention relating to the painting booth is
In the painting booth provided below the painting chamber, an exhaust chamber for receiving the exhaust air containing the paint mist discharged downward from the painting chamber.
Placing the filter device adjacent to the lateral outside of the exhaust chamber;
The inflow port portion of the filter device is opened at the side wall portion of the exhaust chamber into the exhaust chamber.

  According to this configuration, the air discharged from the coating chamber to the lower exhaust chamber flows into the inlet portion of the filter device in a state of uniform airflow in the lateral width direction of the inlet portion (that is, the longitudinal direction of the coating booth here). Therefore, the exhaust air can be uniformly passed through the filter in the filter device, so that the paint mist as the collection target substance contained in the exhaust air from the coating chamber can be smoothly and efficiently passed through the filter device. Can be collected.

  Further, in the inlet portion of the filter device, the precoat agent ejected from the precoat agent nozzle is effectively dispersed in the longitudinal direction of the inlet portion by the retention recess formed at the upper edge portion of the inlet portion as described above. It can be mixed with the gas to be treated (that is, exhausted air), and as described above, a large number of precoat agent nozzles need to be juxtaposed in the booth longitudinal direction at small intervals in the central gap and the bottom gap extending in the booth longitudinal direction. Compared to a painting booth found in certain conventional examples 3 and 4 (FIG. 1 and FIG. 15 of Patent Document 3), the number of necessary precoat agent nozzles can be greatly reduced.

  That is, this makes it possible to simplify the structure of the painting booth including the filter device, reduce the equipment cost of the painting booth, and make the painting booth easy to maintain.

  Further, since the inlet portion of the filter device is directly opened into the exhaust chamber at the side wall portion of the exhaust chamber, a long connection duct for connecting the inlet portion of the filter device and the exhaust chamber is not necessary. The structure of the painting booth including the filter device can be simplified.

  In the implementation of this configuration, when the filter device is disposed adjacent to the lateral side of the exhaust chamber, an arrangement configuration in which the filter device is adjacent to the lateral side of the exhaust chamber having substantially the same width as the coating chamber, or an exhaust chamber is provided. Various arrangement forms such as an arrangement form in which the filter device is arranged in a hollow portion formed on the lateral outer side of the exhaust chamber and below the coating chamber so as to be narrower than the coating chamber can be employed.

  In the case of a simple painting booth in which no exhaust chamber is provided below the painting chamber, the filter device is disposed adjacent to the lateral outer side of the painting chamber in which the object to be coated is sprayed, and the inlet of the filter device is provided. You may make it open a part to the side wall part of the said coating chamber in the bottom part of the said coating chamber.

  Also in this case, similarly to the above, the number of necessary precoat agent nozzles can be greatly reduced, and the structure of the simple coating booth including the filter device can be simplified.

Cross section of painting booth II-II arrow view in FIG. Enlarged sectional view of the inlet IV-IV arrow view in FIG. Cross section of painting booth showing another embodiment Side view sectional view of a simple painting booth showing another embodiment Enlarged sectional view of the inlet port showing another embodiment Cross section showing a conventional painting booth Cross section showing another conventional painting booth

  FIG. 1 and FIG. 2 show a painting booth. In this painting booth, a painting chamber 2 for painting an article to be coated 1 (in this example, an automobile body) with a painting gun is formed. A transport device 3 for transporting the coating 1 is provided.

  The painting chamber 2 has a tunnel-like room shape extending in the conveying direction of the article 1 (the depth direction in FIG. 1). The coating room 2 has ventilation air that is adjusted in temperature and humidity for the entire tunnel-like room. SA is supplied from the ceiling 2a.

  Below the painting chamber 2, an exhaust chamber 4 is formed extending in the conveying direction of the article 1 as in the painting chamber 2, and this exhaust chamber 4 is painted along with the supply of ventilation air SA to the painting chamber 2. The exhaust air EA discharged downward from the chamber 2 through the lattice floor 2b is received.

  The exhaust air EA contains floating paint mist generated by overspraying in the painting chamber 2, and as the ventilation air SA is supplied from the ceiling portion 2a of the painting chamber 2, the painting chamber is in a piston flow manner. The indoor air EA of 2 is discharged to the lower exhaust chamber 4, whereby the floating paint mist generated in the coating chamber 2 is quickly and reliably removed from the coating chamber 2, and the coating quality of the article 1 is kept high. Keep the working environment of the painting room 2 good.

  Filter devices 5 are juxtaposed in the longitudinal direction of the painting booth, which is the conveying direction of the article 1, on both lateral outer sides of the exhaust chamber 4 having substantially the same width as the painting chamber 2, and flows into the exhaust chamber 4. The exhaust air EA from the painting chamber 2 is subsequently passed through these filter devices 5, whereby the paint mist contained in the exhaust air EA is collected by the filter device 5 to purify the exhaust air EA.

  The exhaust air EA purified by the filter device 5 is discharged to the outside by the exhaust fan 7 through the exhaust duct 6 connected to the upper part of each filter device 5 (or returned to the painting chamber 2 through the air conditioner as ventilation air SA). To do.

  In the device case 9 of each filter device 5, a plurality of bag filters 8 are arranged in a vertical state in a suspended posture, and are located below the bag filters 8 and below the side walls 9 a in the device case 9. Two inflow port portions 10 having a flat shape extending in the width direction are formed, and these two inflow port portions 10 are formed in a line in the width direction.

  That is, due to the suction force applied by the exhaust fan 7 through the exhaust duct 6 connected to the upper end portion of the device case 9, the exhaust air EA as the gas to be treated is discharged from the exhaust chamber 4 through the laterally flat inlet portion 10. The bag 9 is caused to flow into the case 9 and pass through the bag filter 8, thereby collecting the paint mist in the exhaust air EA, which is the material to be collected, by the bag filter 8.

  Since the paint mist that is a collection target substance has adhesiveness, the inlet 10 of the filter device 5 is equipped with a precoat agent nozzle 11, and the precoat agent nozzle 11 passes through the inlet 10. A powdery precoat agent P is mixed in the exhaust air EA.

  That is, by passing the exhaust air EA mixed with the powdered precoat agent P through the bag filter 8, a precoat layer (a coating layer made of the precoat agent P) is formed on the collecting surface of the bag filter 8, and this precoat In the presence of the layer, the paint mist in the exhaust air EA is collected by the bag filter 8. Specifically, this precoat layer becomes a deposited layer of the precoat agent P in which the paint mist in the exhaust air EA is mixed in a dispersed state.

  The laterally flat inlet 10 in each of the juxtaposed filter devices 5 is opened in the exhaust chamber 4 at the lower end of each side wall 4a of the exhaust chamber 4 in a line in the booth longitudinal direction. As a result, the exhaust air EA flowing downward from the coating chamber 2 into the exhaust chamber 4 is divided into two major flows in the booth width direction as shown by the arrows in the figure, and these two streams of exhaust air EA are separated in the booth longitudinal direction. While maintaining a uniform air flow state, the exhaust chamber 4 is inclined toward the inlet 10 at the lower end of the exhaust chamber side walls 4a and sucked into the inlet 10 of each filter device 5 without deviation.

  As shown in FIG. 3, a retention recess 12 is formed at the upper edge of each inlet 10 of the filter device 5, and the retention recess 12 faces downward in the longitudinal direction of the inlet 10. It has a cross-sectional shape that opens, and is formed over the entire width of the inlet portion 10 in a state of being continuous in the longitudinal direction (lateral width direction) of the inlet portion 10.

  In the passage direction of the exhaust air EA at the inflow port 10, the upstream edge portion of the retention recess 12 is an upstream drooping wall 12 a in a vertical position continuous with the side wall 4 a of the exhaust chamber 4. The downstream end edge of the recess 12 is a vertical drooping wall 12 b in a vertical position that is continuous with the side wall 9 a of the device case 9.

  An inclined bottom 13 is formed at the lower edge portion of the inlet portion 10, and this inclined bottom 13 faces the retention recess 12 at the upper edge portion, and the exhaust air EA at the inlet portion 10. In the passing direction, it becomes lower toward the downstream side. The inclined bottom 13 is also formed over the entire width of the inlet portion 10 in a state of being continuous in the longitudinal direction (lateral width direction) of the inlet portion 10.

  And in the passage direction of the exhaust air EA in the inflow port part 10, the upstream edge part of the inclined bottom 13 becomes the upstream rising wall 13a of the vertical posture which stands | starts up toward the upstream edge part 12a of the recessed part 12 for residence. It is.

The inflow port portion 10 has a cylindrical structure as a whole, and an upstream opening of the cylindrical structure is formed between the upstream end edge portion 12a of the retention recess 12 and the upstream end edge portion 13a of the inclined bottom 13 positioned therebelow. 10a, a downstream opening 10b having a cylindrical structure is formed between the downstream edge 12b of the retention recess 12 and the downstream edge 13b of the inclined bottom 13 positioned therebelow.
Further, in this cylindrical structure, the downstream drooping wall 12b is disposed at a lower position than the upstream drooping wall 12a, and the downstream opening 10b is positioned lower than the upstream opening 10a.

  In the inlet portion 10 having such a structure, the precoat agent nozzle 11 ejects the precoat agent P together with the pressurized air toward the back of the retention recess 12 at the central portion in the longitudinal direction of each inlet portion 10. It is arranged in.

  That is, under the condition that the flow of the exhaust air EA at the inlet 10 passes near the downward opening of the retention recess 12, the powder is directed toward the back of the retention recess 12 by the precoat agent nozzle 11 as described above. By ejecting the precoat agent P in the form of compressed air together with the compressed air, an eddy stagnation of the air flow with the precoat agent P over an appropriate time is generated in the retention recess 12 as indicated by the solid arrow in the figure.

  As a result, the precoat agent P is diffused in the longitudinal direction (lateral width direction) of the inflow port portion 10 in the retention recess 12 while being agitated by vortex retention, and the diffused precoat agent P is opened downward in the retention recess 12. Then, the pre-coating agent P is mixed with the exhaust air EA in a uniform dispersed state in the longitudinal direction of the inflow port 10.

  Further, the flow velocity of the exhaust air EA is equalized in the vertical direction of the inflow port 10 by the upstream hanging wall 12a of the retention recess 12 and the upstream rising wall 13a of the inclined bottom 13, and in this state, the retention recess 12 The upstream-side drooping wall 12a and the downstream-side dripping wall 12b respectively guide the precoat agent P in the diffusing state in the retention recess 12 together with the air downward, thereby causing the precoat agent P to move in the height direction of the inlet 10 ( The short side direction) is also effectively dispersed.

  Further, the downward flow formed by the guide by the downstream drooping wall 12b causes the flow of the exhaust air EA at the inlet portion 10 to be changed in an obliquely downward direction so that the precoat agent P taken into the flow of the exhaust air EA A part of the precoat agent P that reaches the downstream portion of the inclined bottom 13 and thus reaches the downstream portion of the inclined bottom 13 is swirled on the inclined bottom 13 by the influence of the upstream rising wall 13a. Thus, the pre-coating agent layer is stably formed on the inclined bottom 13 to prevent the coating mist from adhering to the inclined bottom 13.

  Further, as described above, by setting the downstream side opening 10b in the cylindrical structure of the inlet portion 10 to a position lower than the upstream side opening 10a, the exhaust air EA passing through the inlet portion 10 obliquely downward is obliquely downward. The direction is greatly changed upward so as to be directed to the upper bag filter 8, and this also further promotes diffusion of the precoat agent P mixed with the exhaust air EA in the exhaust air EA.

  The inflow port portion 10 will be described in more detail. The retention recess 12 is provided with an upper bottom wall surface 12c that forms an upper bottom portion thereof, and has an inclined posture that becomes lower toward the upstream side in the exhaust air passage direction. The upper bottom wall surface 12c in an inclined posture that becomes lower toward the upstream side in the exhaust air passage direction of the upper bottom wall surface 12c and the upstream end bottom wall surface 12d extending from the base end of the upstream drooping wall 12a and the downstream side in the exhaust air passage direction. A downstream inclined bottom wall surface 12d extending from the downstream end in the exhaust air passage direction to the base end of the downstream drooping wall 12b is provided.

  The ejection port 11a of the precoat agent nozzle 11 is disposed at a position closer to the downstream side than the central portion of the retention recess 12 in the passage direction of the exhaust air EA in the inflow port portion 10, and specifically, this ejection port. 11a is jetted obliquely upward toward the back portion of the retention recess 12 (that is, the upper bottom wall surface 12c) in a state in which the precoat agent P and the pressure-feed air are along the inclined bottom wall surface 12e on the downstream side of the retention recess 12. Arranged in a state.

  That is, the precoat agent P and the compressed air jetted obliquely upward along the downstream inclined bottom wall surface 12e from the precoat agent nozzle 11 are supplied to the upper bottom wall surface 12c, the upstream inclined bottom wall surface 12d, and the upstream drooping wall 12a. By being guided by each of them, the above-described vortex staying area is effectively generated in the upstream portion of the staying recess 12 in combination with the flow of the exhaust air EA passing near the downward opening of the staying recess 12. As a result, the location where the precoat agent P is mixed in the flow of the exhaust air EA at the inlet 10 is biased toward the upstream end of the retention recess 12, and the diffusion time of the precoat agent P after mixing is maximized. Secure.

  A diffusion auxiliary projection 12f that protrudes downward into the retention concave portion 12 is provided at a location in the vicinity of the upstream drooping wall 12a on the upstream inclined wall surface 12d of the retention concave portion 12, and the diffusion auxiliary projection 12f The downward projecting dimension is sufficiently smaller than the downward extending dimension of the upstream drooping wall 12a.

  That is, in order to effectively generate the vortex-like staying area in the upstream portion of the staying recess 12 as described above, the precoat agent P ejected from the precoat agent nozzle 11 and a part of the pumped air are supplied to the upstream inclined bottom wall surface. By colliding with the diffusion assisting protrusion 12f under the guidance of 12d, the diffusion of the precoat agent P in the longitudinal direction (lateral width direction) of the inflow port part is promoted. The diffusion of the precoat agent P in the inflow portion in the longitudinal direction (lateral width direction) is further effectively promoted.

  The diffusion auxiliary protrusions 12f are provided only at locations corresponding to the locations where the precoat agent nozzles 11 are disposed in the longitudinal direction of the inflow port portion 10 or from the locations corresponding to the locations where the precoat agent nozzles 11 are disposed. Any form provided in a state extending continuously in the hand direction may be adopted.

  As shown in FIGS. 3 and 4, the precoat agent nozzle 11 is attached with a diffusion assisting tool 11X made of a vertically oriented triangular plate, and the upper half of the diffusion assisting tool 11X has a discharge air passage direction. The lower half is disposed in a state of projecting into the retention recess 12 through the downstream drooping wall 12b and extending in the exhaust air passage direction below the downstream drooping wall 12b.

  The front edge portion ea (that is, the upstream plate edge portion in the exhaust air passage direction of the triangular plate-like body) of the diffusion assisting tool 11X has a knife edge structure that is sharpened toward the upstream side in the exhaust air passage direction. The lower edge ea of the auxiliary tool 11X has a knife edge structure that is pointed downward.

  Due to the presence of the diffusion aid 11X, the passing exhaust air EA in the inflow port 10 and the air that stays vortexing with the precoat agent P in the dwelling recesses 12 in the longitudinal direction of the inflow port 10 ( (In the width direction), the flow is divided into one side and the other side with a change in direction, and the inlet of the precoat agent P in the retention recess 12 is caused by the change in direction of the passing exhaust air EA and the vortex-like staying air. The diffusion in the longitudinal direction (lateral width direction) of the portion is further promoted, and the diffusion of the precoat agent P in the process of taking the precoat agent P into the flow of the exhaust air EA from the retention recess 12 is also promoted.

  The diffusion assisting tool 11X is disposed only on the upper side of the inflow port portion 10, whereby the inflow port portion 10 is divided while the exhaust air EA is diverted in a state with a change in direction on the upper side of the inflow port portion 10. As a whole, the uniformity and integrity of the passing exhaust air EA in the longitudinal direction of the inlet are maintained as well as possible.

  Further, the diffusion auxiliary tool 11X is arranged on the downstream side of the central portion of the retention recess 12 in the passage direction of the exhaust air EA, similarly to the ejection port 11a of the precoat agent nozzle 11, and thereby the diffusion auxiliary tool 11X. The pre-coating agent P is sufficiently taken into the passing flow of the exhaust air EA from the retention recess 12 at the upstream side, and diffused with respect to the passing exhaust air EA after the pre-coating agent P is sufficiently taken in. The auxiliary tool 11X is caused to perform a shunting action.

  In the device case 9 of the filter device 5, a belt conveyor 14 is provided as a carry-out means below the bag filter 8 and below the downstream opening 10 b of the inlet 10. Are provided across a plurality of filter devices 5 arranged in a row.

  That is, the collected deposit that peels off from the collecting surface of the bag filter 8 (that is, the mixture of the paint mist and the precoat agent P) and the precoat agent P and the paint mist are combined in the process of reaching the bag filter 8. The fallen objects generated in this manner are conveyed in the booth longitudinal direction while being received by the belt conveyor 14 and are carried out of the filter devices 5.

  In the figure, reference numeral 19 denotes a collection hopper that accepts the material carried out by the belt conveyor 14, and the material delivered to the collection hopper 19 is sent to a predetermined collection unit by air conveyance or the like.

Further, in the device case 9 of the filter device 5, a peeling device 15 that jets compressed air in a pulsed manner is provided near the upper portion of the bag filter 8.
That is, when the collected matter accumulation layer on the bag filter collecting surface made of the mixture of the paint mist and the precoat agent P grows to some extent, the peeling device 15 compresses each bag filter 8 from the downstream side in the air passing direction. Air is applied in a pulsed manner, whereby the collected matter accumulation layer is forcibly separated from the collecting surface of the bag filter 8 and dropped onto the belt conveyor 14 to regenerate the bag filter 8.

  From the downstream side end of the inclined bottom 13 in the inflow port portion 10, a soaking prevention guide plate 16 protruding in a horizontal posture is connected to the upper region of the belt conveyor 14, and the exhaust air EA that has passed through the inflow port portion 10 is discharged. Under the guidance of the guide plate 16 for preventing soaring, it is directed to the upper bag filter 8, thereby preventing the light powdery portion of the fallen mixture on the belt conveyor 14 from being soared by the discharged air EA. .

[Another embodiment]
FIG. 5 shows a painting booth in which the above-described painting booth has been improved. In this painting booth, the width of the exhaust chamber 4 is made smaller than the width of the painting chamber 2, and the painting chamber is placed on both sides of the exhaust chamber 4. A depression 17 is formed below 2.

The filter device 5 is juxtaposed in the longitudinal direction of the booth in a state where the recess 17 is adjacent to the lateral outer side of the exhaust chamber 4.
The laterally flat inlet 10 in the filter device 5 is opened to the exhaust chamber 4 at the lower end of each side wall 4a of the exhaust chamber 4 in a state of being arranged in a line in the booth longitudinal direction, like the coating booth. is there.

  According to this painting booth, the required installation area of the painting booth including the filter device 5 can be reduced while adopting a structure in which the filter device 5 is juxtaposed in the booth longitudinal direction adjacent to the exhaust chamber 4.

  Also in this painting booth, the inflow port 10 of the filter device 5 is provided with a retention recess 12, a precoat agent nozzle 11, and a diffusion aid 11X having the same structure as that shown in FIGS. .

  FIG. 6 shows a simple painting booth. In this simple painting booth, the side of the painting chamber 2 where the article 1 is to be painted is located on the opposite side of the painting gun 18 from the deployment side. The filter device 5 is adjacent to the coating chamber 2 in such a form that the side wall 2 c is shared as one side wall of the device case 9 in the filter device 5.

  The inlet 10 of the filter device 5 extending in the width direction is opened at the bottom of the coating chamber 2 at the lower end of the shared side wall 2c.

  In the filter device 5, basically, the exhaust air EA sucked into the device case 9 from the coating chamber 2 through the inflow port portion 10 is changed upward in the same manner as the filter device shown in the above-described embodiment, so that the bag filter 8. , The paint mist in the exhaust air EA is collected by the bag filter 8.

  Also in this simple coating booth, the inflow port 10 of the filter device 5 is provided with a retention recess 12, a precoat agent nozzle 11, and a diffusion aid 11X having substantially the same structure as that shown in FIGS.

  A collection container 20 is provided at the bottom of the device case 9, and collected deposits (mixed deposits of paint mist and precoat agent P) that are peeled off from the collection surface of the bag filter 8 and dropped are collected in this collection container. 20 is received and accommodated.

  In the implementation of these painting booths and simple painting booths, the side wall 9a of the device case 9 in the filter device 5 is adjacent to the side wall 4a of the exhaust chamber 4 and the side wall 2c of the coating chamber 2, or the exhaust chamber 4 Any of the adjacent installation forms in which the side wall 4a of the coating chamber 2 and the side wall 2c of the coating chamber 2 are shared as the side wall 9a of the device case 9 in the filter device 5 may be employed.

  In the implementation of the present invention, the specific cross-sectional shape of the retention recess 12 in the longitudinal direction of the inlet port can be variously changed such as various polygonal shapes and arc-shaped shapes.

  In the practice of the present invention, the specific structure and arrangement of the precoat agent nozzle 11 and the diffusion aid 11X can be variously changed. For example, as shown in FIG. The recess 12 may be disposed in an oblique orientation or a vertical orientation with respect to the inclined bottom wall surface 12e, and the diffusion assisting tool 11X may be attached to the precoat agent nozzle 11 in the vicinity of the spout 11a.

  The diffusion assisting tool 11X is formed by a member having a V-shaped cross section that is pointed toward the upstream side in the direction of the gas to be processed, instead of the plate edge portion ea being formed by a vertically oriented plate-like body having a knife edge structure. May be.

  Further, instead of positioning the upper end portion of the diffusion assisting tool 11X in the retention recess 12 as in the above-described embodiment, the entire diffusion assisting tool 11X may be disposed below the retention recess 12, Furthermore, instead of providing the diffusion assisting tool 11X only on the upper part of the inflow port portion 10 as in the above-described embodiment, the diffusion assisting tool 11X may be arranged across the entire vertical direction of the inflow port portion 10. .

  In the above-described embodiment, an example in which the diffusion assist protrusion 12f is arranged in a vertical posture has been described. However, the diffusion assist protrusion 12f has an inclined posture that is located on the upstream side or the downstream side in the gas passage direction toward the lower end side. You may arrange.

  In the embodiment of the present invention, the diffusion assisting protrusion 12f can be omitted, and a filter device in which the diffusion assisting plate 11X is omitted from the equipment of the diffusion assisting protrusion 12f is also conceivable as a reference device.

  The upstream opening 10a and the downstream opening 10b of the inflow port portion 10 may be arranged at the same height, and conversely, the downstream opening 10b may be arranged at a higher position than the upstream opening 10a.

Examples of the precoat agent P include calcium carbonate powder, caustic soda powder, slaked lime powder, calcium hydroxide powder, calcium silicate powder, zeolite powder, rock powder, aluminum oxide powder, silicon oxide powder, Various powdery substances, such as powder paints, can be used depending on the adhesive substance to be collected.
Among them, those that can reduce the tackiness of the substance to be collected by combining with a substance to be collected such as paint mist, and those that have a deodorizing effect, a sterilizing effect, and the like are preferable.

  The gas to be treated containing the substance to be collected is not limited to air but may be any gas.

  The filter 8 provided in the device case 9 is not limited to a bag filter, and various filters such as a pleat shape, a flat plate shape, and a box shape can be employed according to the substance to be collected and the precoat agent P.

  In the implementation of the filter device according to the present invention and the painting booth using the filter device, an operation method in which a deposition coating layer of only the spray precoat agent P is formed in advance on the collection surface of the filter 8 prior to the collection of the substance to be collected. May be adopted.

  Moreover, during the collection operation of the collection target substance, not only the operation method in which the precoat agent P is continuously ejected, but an operation method in which the precoat agent P is intermittently ejected during the collection operation may be employed. .

  The filter device according to the present invention can be used not only for collecting paint mist but also for collecting sticky collection objects in various fields.

  In addition, the painting booth according to the present invention can be used for painting various objects such as automobile bodies, automobile parts, cases of household electrical appliances, and various steel materials.

  The present invention can be used in various fields where it is necessary to collect sticky collection objects such as painting equipment.

9 Device Case 8 Filter EA Gas to be Processed, Exhaust Air 10 Inlet Port P Precoat Agent 11 Precoat Agent Nozzle 11X Diffusion Aid ea Plate Edge 12 Retention Recess 12a Upstream Down Wall 12b Down Down Wall 12c Upper Bottom Wall 12d Upstream side inclined bottom wall surface 12f Diffusion auxiliary protrusion 13 Inclined bottom 10a Upstream side opening 10b Downstream side opening 13a Upstream side rising wall 1 Object 2 Coating chamber 4 Exhaust chamber 5 Filter device 4a Side wall 2c Side wall

Claims (16)

In addition to forming an inlet portion into which the gas to be treated flows in the apparatus case, the apparatus case is equipped with a filter that collects an adhesive substance to be collected contained in the gas to be treated.
A precoat agent nozzle that ejects a powdery precoat agent for a filter together with a gas is a filter device arranged at the inlet portion,
The inlet portion is a laterally flat opening extending in the lateral width direction,
A recess for retention having a cross-sectional shape opening downward in the longitudinal direction of the inlet portion is formed in the upper edge portion of the inlet portion continuously in the longitudinal direction of the inlet portion,
The precoat agent nozzle is arranged at a predetermined position in the longitudinal direction of the inflow port portion in a state in which the precoat agent and gas are ejected toward the back of the retention recess,
A diffusion assisting tool for diverting the gas to be processed at the inlet portion to the one side and the other side in the longitudinal direction of the inlet portion, and the precoat agent nozzle in the longitudinal direction of the inlet portion. The filter apparatus arrange | positioned at the said inflow port part in the vicinity of arrangement | positioning location.   The filter device according to claim 1, wherein the diffusion assisting tool is a plate-like body having a vertical posture provided with a plate edge portion having a knife edge structure that is sharpened toward the upper side in the gas passage direction.   The filter device according to claim 1, wherein the diffusion aid is disposed only on an upper side of the inlet portion.   The filter device according to any one of claims 1 to 3, wherein a jet port of the precoat agent nozzle is disposed closer to a downstream side than a central portion of the retention concave portion in a gas passing direction.   The filter device according to any one of claims 1 to 4, wherein the diffusion assisting tool is disposed closer to the downstream side than the central portion of the retention recess in the gas passage direction.   The filter device according to any one of claims 1 to 5, wherein the diffusion aid is arranged in a state where an upper end portion thereof is positioned inside the retention recess.   The filter device according to any one of claims 1 to 6, wherein an upstream edge portion of the retention recess in the gas passage direction is an upstream hanging wall in a vertical posture.   The filter device according to any one of claims 1 to 7, wherein an end edge portion on the downstream side of the retention recess in the gas passage direction is a vertical hanging wall in a vertical posture.   The filter device according to claim 8, wherein the diffusion assisting tool is arranged in a state in which an upper end portion thereof protrudes from the downstream hanging wall into the inside of the retention recessed portion in the direction of gas to be processed.   The filter device according to claim 9, wherein the diffusion assisting tool is disposed in a state where a lower end portion thereof extends in a direction in which the gas to be processed passes below the downstream hanging wall.   The filter device according to claim 1, wherein the diffusion aid is attached to the precoat agent nozzle.   2. An inclined bottom that faces the retention recess and becomes lower toward the downstream side in the gas passage direction is formed at the lower edge of the inlet portion so as to be continuous in the longitudinal direction of the inlet portion. The filter apparatus of any one of -11.   The filter device according to claim 12, wherein an upstream edge portion of the inclined bottom in the gas passage direction is a vertical upstream rising wall that rises toward an upstream edge portion of the retention recess. . The inlet portion has an upstream opening between an upstream edge portion of the retention recess in the gas to be processed passage direction and an upstream edge portion of the inclined bottom located below, and A cylindrical structure having a downstream opening between a downstream edge portion of the retention recess in the gas to be processed passage direction and a downstream edge portion of the inclined bottom located therebelow,
In this cylindrical structure, the downstream opening is disposed at a position lower than the upstream opening,
The filter device according to claim 12 or 13, wherein the filter is disposed at a position higher than the downstream opening in the device case. The retention recess includes an upper bottom wall surface forming an upper bottom portion thereof, a vertical upstream wall located at an upstream end edge of the retention recess in the gas passing direction, and a gas passing direction. An upstream inclined bottom wall surface extending from the upstream end in the gas passage direction of the upper bottom wall and the base end of the upstream drooping wall in an inclined posture that becomes lower toward the upstream side,
In the vicinity of the upstream drooping wall on the upstream inclined bottom wall surface, a diffusion assisting protrusion that protrudes downward into the retention recess is provided, and the downward projecting dimension of the diffusion assisting protrusion is as described above. Smaller than the downward extension of the hanging wall on the upstream side,
The jet port of the precoat agent nozzle is arranged in a state in which the precoat agent and gas are jetted obliquely upward from the downstream side in the gas passage direction to the upper bottom wall surface. The filter device according to item. A coating booth using the filter device according to any one of claims 1 to 15,
In the painting booth provided below the painting chamber, an exhaust chamber for receiving the exhaust air containing the paint mist discharged downward from the painting chamber.
Placing the filter device adjacent to the lateral outside of the exhaust chamber;
A painting booth in which the inlet portion of the filter device is opened to the inside of the exhaust chamber at a side wall portion of the exhaust chamber.

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