JP5515178B2 - Exhaust equipment - Google Patents

Description

  The present invention relates to an exhaust system for exhausting air containing paint mist, and more specifically, in the vicinity of the bottom wall of the exhaust chamber, on the side wall of the exhaust chamber, in the form of a slit or rectangle with the lateral direction of the side wall as the longitudinal direction. The present invention relates to an exhaust facility that is provided with an exhaust port and sucks air in the exhaust chamber containing the paint mist from the exhaust port and guides it to the paint mist processing apparatus.

  Conventionally, there is a coating booth as shown in FIG. 12 for this type of exhaust equipment (see Patent Document 1).

  In this painting booth, surplus spray paint mist generated in the painting operation in the painting room 2 is discharged downward from the painting room 2 together with the indoor air EA in the painting room 2, and this exhausted air EA (air containing paint mist) is painted. It is received in the exhaust chamber 4 immediately below the chamber 2.

  The paint mist-containing air EA is guided downward through an exhaust path between two vertical walls 4a extending downward from the exhaust chamber 4, and a slit between the lower end edge of the vertical walls 4a and the bottom wall 4b. Is introduced sideways into the filter housing chamber 5A through the gas exhaust port 10a.

  In this painting booth, the precoat agent nozzle 11 that ejects the precoat powder agent P for the filter to the paint mist-containing air EA that has passed through the exhaust port 10a is provided at the lower end of the vertical wall 4a on the filter housing chamber 5A side. The precoat powder agent P ejected from the precoat agent nozzle 11 is delivered to the dry filter 8 together with the paint mist-containing air EA, and the precoat powder agent P is applied to the filter surface. A protective layer is formed.

  That is, the paint mist-containing air EA is passed through the dry filter 8 and the paint mist in the air EA is collected while the protective layer prevents direct adhesion of the paint mist to the dry filter 8.

Japanese translation of PCT publication No. 2008-536661

  However, the exhaust chamber 4 starts from the slit-shaped or rectangular exhaust port 10a provided on the side wall 4a of the exhaust chamber 4 near the bottom wall 4b of the exhaust chamber 4, such as the above-described painting booth. In the exhaust system that sucks in the paint mist-containing air EA inside, the paint mist-containing air EA in the exhaust chamber 4 concentrates on the exhaust port 10a and passes through the exhaust port 10a at a high speed. The paint mist-containing air EA that flows downward and reaches the exhaust port 10a suddenly changes in the horizontal direction and flows into the exhaust port 10a. Therefore, in the exhaust chamber 4, the wall surface portion around the exhaust port 10a in the side wall 4a (particularly The paint mist adheres to the upper wall surface of the exhaust port 10a and is likely to deposit.

  And because of the deposition of such paint mist, cleaning work is frequently required to remove the deposited paint, and the cleaning work is performed in terms of labor, expenses, and operating hours that require the facility to be shut down. There was a problem that would increase the burden.

  In addition, the paint lump formed on the wall surface portion around the exhaust port 10a due to the adhesion and deposition of the paint mist as described above, particularly the paint lump that hangs down in an icicle shape from the wall surface portion on the upper edge of the exhaust port 10a, There is also a problem that causes trouble in the operation of the paint mist processing device such as clogging of the filter 8 in the filter device by being peeled off by the passing air and being carried away to the downstream paint mist processing device such as the filter device.

  In view of this situation, a main problem of the present invention is to provide an exhaust facility that can effectively solve the above-described problems by rational improvement.

The present invention relates to an exhaust facility, the first characteristic configuration of which is
Near the bottom wall of the exhaust chamber, a slit-shaped or rectangular exhaust port having a longitudinal direction in the width direction of the side wall is provided on the side wall of the exhaust chamber, and the paint in the exhaust chamber containing the paint mist is sucked from the exhaust port. An exhaust system leading to a mist processing device,
An air discharge port that discharges air for preventing paint mist adhesion from the vicinity of the upper side of the exhaust port to the inside of the exhaust chamber is disposed on the side wall so as to extend over the entire length in the longitudinal direction of the exhaust port. There is a point.

  In other words, according to this configuration, the paint mist prevention air discharged from the air discharge port to the inside of the exhaust chamber suddenly changes in the horizontal direction from the upper part of the exhaust chamber to the exhaust port, and then enters the exhaust port. Between the inflowing paint mist-containing air and the wall surface portion (including the air discharge port) of the upper edge of the exhaust port on the side wall, the intervening air layer is in the lengthwise direction of the exhaust port. Formed over.

  In other words, the formation of this intervening air layer can effectively prevent the deposition of paint mist on the wall surface portion of the upper edge of the exhaust outlet on the side wall, thereby reducing the frequency of the cleaning work required to remove the deposited paint. It is possible to effectively reduce the burden of cleaning work.

  In addition, the paint lump formed by the adhesion and deposition of the paint mist on the wall portion of the upper edge of the exhaust port is carried away to the downstream paint mist processing device such as a filter device by the air passing through the exhaust port, and the paint mist processing device is operated. Troubles can be effectively prevented.

  In addition, with the above configuration, since the air discharge port is disposed in the vicinity of the upper side of the exhaust port, for example, paint is applied to the wall portion of the upper edge of the exhaust port by discharging air from the upper part of the exhaust chamber along the side wall. Compared to preventing the deposition of mist, the air discharged from the air discharge port can be used to prevent the paint mist from adhering to the wall surface of the upper edge of the exhaust port accurately and without waste. As described above, it is possible to effectively and reliably prevent the coating mist from being deposited on the wall surface portion of the upper edge of the exhaust port, while reducing the air blowing speed and the amount of air flow to reduce the air blowing power required for air discharge. .

  For the upper part of the side wall and the upper and lower middle part (that is, the side wall part excluding the lower part of the side wall in the vicinity of the exhaust port), there is room air flowing downward along the wall surface of the side wall toward the exhaust port. Since the paint mist in the inside is also led to the exhaust port while riding on the downward flow of air, the adhesion and deposition of the paint mist that is particularly problematic does not occur.

  In the implementation of the above configuration, the air discharge port arranged in a state extending over the entire length in the longitudinal direction of the exhaust port has a dimension in the longitudinal direction larger than that of the exhaust port, and both ends of the air discharge port in the longitudinal direction of the exhaust port. It is desirable that the portion is located to some extent outside both ends of the exhaust port.

The second feature configuration of the present invention is the implementation of the first feature configuration,
The air discharge port is configured to discharge air for preventing paint mist adhesion horizontally or obliquely downward into the exhaust chamber.

  In other words, according to this configuration, air is discharged from the air discharge port horizontally or obliquely downward, so that, for example, a structure in which an air discharge port that discharges air downward along the side wall surface is provided on the side wall, etc. In comparison, the air discharge port (specifically, the forming member) can be provided on the side wall without protruding from the side wall into the exhaust chamber.

  That is, this makes it possible to effectively avoid the paint mist adhering to the forming member of the air discharge port and the formation of the paint lump caused by it, thereby reducing the burden of cleaning work and causing the paint lump. The prevention of driving trouble can be achieved more reliably.

The third feature configuration of the present invention is the implementation of the first feature configuration,
The air discharge port is configured such that air for preventing paint mist adhesion is discharged downward into the exhaust chamber.

  That is, according to this configuration, it is possible to effectively and reliably prevent the coating mist from being deposited on the wall surface portion of the upper edge of the exhaust port, while reducing the blowing power required for air discharge.

  That is, in the second feature configuration in which air is discharged horizontally or obliquely downward from the air discharge port into the exhaust chamber, the air discharged from the air discharge port horizontally or obliquely downward is discharged from the upper portion of the exhaust chamber. The above-mentioned intervening air layer is formed between the indoor air flow and the upper edge wall surface portion of the exhaust port in a state of being pressed to the side of the upper edge wall surface portion of the exhaust port by the indoor air flow that changes in the horizontal direction to the vicinity of the exhaust port. Thus, the paint mist adherence preventing function is applied to the upper edge wall surface portion of the exhaust port.

  On the other hand, according to the above configuration, since air is discharged downward from the air discharge port, in other words, the indoor air flow that changes from the upper part of the exhaust chamber to the vicinity of the exhaust port and toward the horizontal side and the upper edge wall surface portion of the exhaust port Since the above-mentioned intervening air layer is formed by discharging air toward the wall, the discharge air from the air discharge port can be directly prevented from adhering to the wall surface portion of the exhaust port upper edge, Accordingly, the deposition speed of the paint mist on the wall of the upper edge of the exhaust outlet is effectively and reliably reduced while reducing the air blowing speed and the amount of air discharged from the air outlet to further reduce the blowing power required for air discharge. Can be prevented.

  In addition, in the flow region of the indoor air flow that flows downward toward the exhaust port along the wall surface of the side wall (or the indoor air flow that tends to change in the horizontal direction toward the exhaust port), the room Since air is discharged downward from the air discharge port in a state along the air flow, the air blowing power required for air discharge from the air discharge port can be reduced.

  In the implementation of the above configuration, paint mist adheres and accumulates on the air discharge port forming member while the air discharge port (specifically, the forming member) protrudes into the exhaust chamber. It is desirable to take measures to prevent, for example, indoor air that flows downward from the upper part of the exhaust chamber along the side wall together with the paint mist contained therein to dodge the air discharge port forming member at the location where the air discharge port is formed. It is desirable to provide an airflow guide means such as an inclined plate for guiding the indoor air so that the direction of the air is loosely and smoothly changed toward the exhaust chamber.

According to a fourth feature configuration of the present invention, in any one of the first to third feature configurations,
In the state where the box opening of the air supply box is closed by the discharge port forming wall part which is the wall part in which the air discharge port is formed among the side walls, the air supply box is disposed on the back side of the side wall and is disposed on the side wall. attachment,
The air supplied to the inside of the air supply box through the air supply path is discharged from the air discharge port into the exhaust chamber.

  In other words, according to this configuration, the air supply box having the box opening is attached to the side wall on the back side of the side wall, and the box of the air supply box is formed by the discharge port forming wall portion that is the wall portion in the side wall in which the air discharge port is formed. By simply closing the opening, the inside of the air supply box can be used as an air supply chamber for the air discharge port, and the air supplied to the inside of the air supply box through the air supply path can be discharged from the air discharge chamber by the static pressure inside the box. it can.

  That is, as a result of this, the distribution of the discharge air at the air discharge port (particularly in the longitudinal direction of the air discharge port) compared to a structure in which an air supply duct is directly connected to the air discharge port formed on the side wall. Distribution) can be made uniform, and the installation of the air discharge port can be facilitated while more reliably preventing the coating mist from adhering to the wall portion of the upper edge of the exhaust port.

The fifth feature configuration of the present invention is the implementation of the fourth feature configuration,
The discharge port forming wall portion is detachably attached to the main body of the side wall as a lid for the box opening.

  In other words, according to this configuration, the discharge port forming wall portion in which the air discharge port is formed in the side wall is detachably attached to the main body portion of the side wall as a lid for the box opening of the air supply box. Since the air discharge port is formed in the discharge port forming wall part that is detachably attached to the main body part of the side wall as a lid for the opening, the air discharge port is installed and constructed by direct processing on the main body part of the side wall. The installation construction of the discharge port can be further facilitated.

  In addition, the discharge port forming wall portion as the lid can be removed from the side wall main body, and the inside of the air supply box can be easily inspected and repaired from the exhaust chamber side.

The sixth feature configuration of the present invention is the implementation of the fourth or fifth feature configuration,
An airflow guide tube linearly extending from the air outlet to the inside of the air supply box is provided,
It is the point which has the composition which prescribes | regulates the discharge direction of the air from the said air discharge port by sending the air in the said air supply box to the said air discharge port through this airflow guide cylinder.

  That is, in this configuration, in the process of passing through the inside of the airflow guide cylinder, the air sent from the inside of the air supply box to the air discharge port is given dynamic inertia in the direction along the cylinder axis direction of the airflow guide cylinder, The discharge direction of air from the air discharge port is defined as a direction along the cylinder axis direction of the airflow guide tube.

  Therefore, by setting the attitude of the airflow guide tube that linearly extends from the air discharge port to the inside of the air supply box, the direction of the air discharged from the air discharge port into the exhaust chamber is accurately defined in a required direction. be able to.

  Further, in the case of adopting the second characteristic configuration in which air is discharged from the air discharge port horizontally or obliquely downward, a structure is adopted in which the air discharge port (specifically, the forming member) is not discharged from the side wall into the exhaust chamber. The air can be accurately discharged from the air discharge port in the horizontal direction or obliquely downward at a desired inclination angle.

  This configuration is particularly effective when the air discharge wind speed (surface wind speed) from the air discharge port is set to be relatively large.

The seventh feature configuration of the present invention is the implementation of the sixth feature configuration,
In the air supply box, a porous dispersion plate is provided over the entire longitudinal section of the air supply box between the connection portion of the air supply path and the airflow guide tube.

  In other words, in this configuration, the air supplied to the air supply box through the air supply passage is passed through the porous dispersion plate, so that the air flow distribution inside the air supply box is made uniform in the longitudinal section direction of the air supply box. .

  That is, this makes it possible to more effectively uniformize the distribution of the discharge air at the air discharge port (particularly, the distribution in the longitudinal direction of the air discharge port), whereby the paint on the wall surface portion of the upper edge of the exhaust port. Mist adhesion can be prevented more reliably.

The eighth characteristic configuration of the present invention is the implementation of any of the first to fifth characteristic configurations,
The air discharge port is provided with a porous diffuser plate over the entire opening surface.

  In other words, in this configuration, the distribution of the discharge air at the air discharge port (particularly the distribution in the longitudinal direction of the air discharge port) is made uniform by allowing the discharge air to pass through the porous diffuser plate on the opening surface of the air discharge port. To do.

  That is, this makes it possible to more reliably prevent the paint mist from adhering to the wall surface portion of the upper edge of the exhaust port, as in the seventh feature configuration.

  This configuration is particularly effective when the air discharge speed (surface wind speed) of air from the air discharge port is set to be relatively small, or when air is discharged horizontally from the air discharge port.

The ninth feature configuration of the present invention is the implementation of any of the first to eighth feature configurations,
An auxiliary powder mixing means for mixing the auxiliary powder agent for preventing paint mist adhesion to the air after being discharged from the air discharge port or the air before being discharged from the air discharge port is provided.

  That is, in this configuration, in addition to forming the above-described intervening air layer by discharging air from the air discharge port to prevent the paint mist from adhering to the upper edge wall surface portion of the exhaust port, the air after being discharged from the air discharge port or By mixing the auxiliary powder agent with the air before discharging from the air discharge port, the auxiliary powder agent also functions to protect the upper edge wall surface of the exhaust port, and by combining the auxiliary powder agent and the paint mist. It also reduces the adhesion (stickiness) of the paint mist.

  Therefore, the formation of the intervening air layer by air discharge from the air discharge port and the above function of the auxiliary powder agent combined with the paint mist on the wall surface portion of the upper edge of the exhaust port as compared with the formation of the intervening air layer alone. Adhesion can be more effectively and reliably prevented.

  In the implementation of this configuration, when the auxiliary powder agent is mixed with the air discharged from the air discharge port, the auxiliary powder agent outlet is connected to the air discharge port and the exhaust port as an auxiliary agent mixing means. What is necessary is just to provide in the side wall part between.

  Further, when the auxiliary powder agent is mixed with the air before being discharged from the air discharge port, as the auxiliary agent mixing means, for example, an in-box injection means for injecting the auxiliary powder agent into the inside of the above-mentioned air supply box. It may be provided.

  In addition, in the implementation of this configuration, when the paint mist-containing air that has passed through the exhaust port is guided to the filter device and the paint mist is collected by the filter, surplus that is guided to the filter device through the exhaust port together with the paint mist-containing air. Using this auxiliary powder agent as a precoat powder agent for the filter, a protective layer made of the excess auxiliary powder agent is formed on the filter surface, and this protective layer directly attaches the paint mist to the filter. In the prevented state, the paint mist-containing air may be passed through a filter to collect the paint mist.

The tenth feature configuration of the present invention is the implementation of any of the first to ninth feature configurations,
The amount of air discharged from the air outlet is 1% to 20% of the amount of air sucked from the exhaust.

  That is, when the air discharge air volume from the air discharge port is excessive with respect to the air intake air flow from the exhaust port, the paint mist-containing air in the exhaust chamber is discharged from the exhaust port due to the discharge air from the air discharge port. When the smooth and efficient discharge function is reduced, and the air discharge rate from the air outlet is too small compared to the air intake rate from the exhaust port, the paint on the wall at the upper edge of the exhaust port The function to prevent mist adhesion cannot be obtained sufficiently.

  On the other hand, if the amount of air discharged from the air outlet is 1% to 20% of the amount of air sucked from the outlet as described above, the paint mist-containing air in the exhaust chamber is smoothly and efficiently discharged from the outlet. While discharging, it is possible to effectively prevent paint mist from adhering to the wall surface portion of the upper edge of the exhaust port.

An eleventh feature configuration of the present invention is the implementation of any of the first to tenth feature configurations,
The air discharge wind speed at the air discharge port is set to 0.2 m / s to 10 m / s.

  In other words, when the air discharge wind speed (surface wind speed) from the air discharge port is excessive, the paint mist-containing air in the exhaust chamber is smoothly and efficiently discharged from the exhaust port due to the air discharge from the air discharge port. When the air discharge speed from the air outlet (surface wind speed) is too low, the function to prevent the paint mist from adhering to the wall portion of the upper edge of the exhaust outlet cannot be obtained sufficiently. .

  On the other hand, if the air discharge speed (surface wind speed) at the air discharge port is set to 0.2 m / s to 10 m / s as described above, the paint mist-containing air in the exhaust chamber is smoothly and efficiently discharged from the exhaust port. However, it is possible to effectively prevent the paint mist from adhering to the wall surface portion of the upper edge of the exhaust port.

A twelfth feature configuration of the present invention is any one of the first to eleventh feature configurations,
A plurality of the air discharge ports are arranged in the vertical direction.

  In other words, when the opening area of the air discharge port is small enough to secure a sufficient amount of air discharge air from the air discharge port, the air discharge wind speed from the air discharge port becomes large and air flow turbulence occurs around the discharge air flow. As a result, the function of preventing the paint mist from adhering to the upper edge of the exhaust port and the wall surface portion around the exhaust port may be lowered.

  On the other hand, according to the above configuration, it is possible to reduce the air discharge air speed of each air discharge port by securing a large air discharge air volume with the plurality of air discharge ports provided in a row in the vertical direction. Thus, it is possible to more reliably prevent the paint mist from adhering to the upper edge of the exhaust port and the wall surface of the periphery of the exhaust port by avoiding the deterioration of the paint mist adhesion preventing function caused by the turbulence of the airflow as described above.

  This configuration is particularly effective when the width dimension in the height direction of each air discharge port is made relatively small in order to define the air discharge direction.

  In the implementation of this configuration, it is preferable to arrange a plurality of air discharge ports that discharge air horizontally or obliquely downward in the vertical direction, but the air discharge ports that discharge air horizontally or obliquely downward and the air discharge downwards The air outlets to be arranged may be provided side by side in the vertical direction, and in some cases, a plurality of air outlets for discharging air downward may be provided in the vertical direction.

According to a thirteenth feature configuration of the present invention, in any one of the first to twelfth feature configurations,
A side air discharge port that discharges air for preventing paint mist adhesion from the vicinity of both sides of the exhaust port to the inside of the exhaust chamber is arranged to extend across the entire width of the exhaust port in the height direction. It exists in the point provided in the said side wall.

  In other words, according to this configuration, the paint mist-containing air and the exhaust gas from the upper part of the exhaust chamber to the exhaust port are discharged by air discharge from the air discharge port (that is, the upper air discharge port) provided near the upper side of the exhaust port. In addition to forming the above-mentioned intervening air layer with the wall surface part (including the air discharge port) of the upper edge of the mouth, containing paint mist that concentrates toward the exhaust port due to air discharge from the side air discharge port A similar intervening air layer can also be formed between the air and the wall surface portions (including the side air discharge ports) on both lateral edges of the exhaust port.

  That is, in addition to preventing the paint mist from adhering to the wall portion of the upper edge of the exhaust port, this can also effectively prevent the paint mist from adhering to the wall surface portions of both sides of the exhaust port. It is possible to more effectively prevent the paint mist from adhering to the peripheral wall surface portion, thereby more reliably achieving the reduction in the burden of cleaning work and the prevention of operation troubles caused by the paint lump.

  In the implementation of this configuration, the direction of air discharge from the side air discharge port may be either horizontal, diagonally downward, or diagonally inclined to the exhaust port side. It may be facing sideways.

  In addition, in the implementation of this configuration, in addition to providing the upper air discharge port and the side air discharge port, from the vicinity of the lower side of the exhaust port to the inside of the exhaust chamber horizontally, obliquely upward, or upward A lower air discharge port for discharging air for preventing paint mist adhesion may be arranged on the side wall so as to extend over the entire length in the longitudinal direction of the exhaust port.

  Further, in order to provide these side air outlets and lower air outlets, side air outlets have the same configuration as the fourth to ninth characteristic configurations adopted for the air outlet (upper air outlet). Or it may be adopted for the lower air outlet.

  That is, in the state in which the box opening of the air supply box is closed by the discharge port forming wall portion in which the side air discharge port and the lower air discharge port are formed in the side wall, the air supply box is disposed on the back side of the side wall and the side wall The air supplied to the inside of the air supply box through the air supply passage may be discharged from the side air outlet and the lower air outlet into the exhaust chamber.

  Moreover, you may make it attach to the main-body part of a side wall so that the discharge port formation wall part which formed the side part air discharge port and the lower air discharge port as a cover body with respect to a box opening can be attached or detached.

  In addition, an airflow guide tube that extends linearly from the side air discharge port or the lower air discharge port to the inside of the air supply box is provided, and the air in the air supply box is passed through the airflow guide tube to the side air discharge port or You may make it the structure which prescribes | regulates the discharge direction of the air from a side air discharge port or a lower air discharge port by sending to a lower air discharge port.

  In addition, a porous dispersion plate that covers the entire longitudinal section of the air supply box is provided between the connection portion of the air supply path and the airflow guide cylinder for the side air discharge port and the lower air discharge port inside the air supply box. Also good.

  Moreover, you may provide the porous diffuser board over the whole opening surface in a side air discharge port or a lower air discharge port.

  Auxiliary powder agent for preventing paint mist adhesion is mixed with air after being discharged from the side air outlet or lower air outlet or air before being discharged from the side air outlet or lower air outlet. An agent mixing means may be provided.

  In addition, when providing the air supply box with respect to a side air discharge port or a lower air discharge port, the air supply box may be shared with the air supply box for the upper air discharge port.

  Further, the discharge port forming wall portion forming the side air discharge port and the lower air discharge port may be integrated with the discharge port forming wall portion forming the upper air discharge port.

In a fourteenth feature configuration of the present invention, in any one of the first to thirteenth feature configurations,
As the paint mist treatment device, a filter device that collects paint mist in the air with a dry filter is disposed in the state of being close to the side wall outside the exhaust chamber, and connected to the outlet side of the exhaust port,
On the inner surface side of the upper wall of the air introduction cylinder portion extended from the exhaust port to the filter device side, a retention recess having a concave cross-sectional shape that opens downward in a cross-sectional shape in the longitudinal direction of the exhaust port is provided in the exhaust. Formed continuously in the longitudinal direction of the mouth,
In a state where a precoat powder agent for a filter mixed with air introduced into the filter device from the exhaust port through the air introduction tube portion collides with the inner surface of the retention recess at a predetermined position in the longitudinal direction of the exhaust port, Provided with a precoat agent nozzle that ejects a precoat powder agent together with air toward the inner surface of the retention recess,
This squirting has a configuration in which the pre-coating powder agent and air are swirled in the retention recess.

  In other words, according to this configuration, the precoat powder agent for the filter is directed toward the inner surface of the retention recess in a state of colliding with the inner surface of the retention recess at a predetermined position in the longitudinal direction of the exhaust port (that is, the lateral width direction). Is ejected from the precoat agent nozzle together with the air, so that the flow of the paint mist-containing air passing through the air introduction cylinder passes through the vicinity of the downward opening of the retention recess, and is ejected in the retention recess. It is possible to cause vortex retention of the air with the powder agent over an appropriate time, and the vortex stagnation causes the sprayed pre-coated powder agent to be retained in the retention recess that is continuous in the longitudinal direction of the exhaust port. It can be diffused in the longitudinal direction of the exhaust port (lateral width direction of the side wall).

  Then, while diffusing the precoat powder in the longitudinal direction of the exhaust port in this way, the diffused precoat powder is gradually passed from the downward opening of the retention recess to the passing flow of the paint mist-containing air in the air introduction cylinder. The precoat powder agent for the filter can be uniformly dispersed in the longitudinal direction of the exhaust port with respect to the air containing the paint mist introduced into the filter device from the exhaust port through the air introduction tube portion. Thus, a protective layer for preventing paint mist adhesion made of a pre-coated powder agent can be satisfactorily formed in a uniform state on the surface of the dry filter in the filter device.

  In addition, according to this configuration, it is possible to avoid juxtaposing a large number of precoat agent nozzles in the longitudinal direction of the exhaust port at a small interval, and one precoat agent nozzle for a slit-like or rectangular exhaust port. Even if the precoat agent nozzle is juxtaposed in the longitudinal direction of the exhaust port, the juxtaposition interval can be increased to effectively reduce the number of juxtapositions. The cost can be reduced and the maintenance of the precoat agent nozzle can be facilitated.

  Further, in this structure in which the precoat powder agent is diffused in the longitudinal direction of the exhaust port in the retention recess, the paint lump is deposited on the periphery (especially the upper edge) of the exhaust port due to the deposition of paint mist on the wall surface of the periphery of the exhaust port. Is formed, the function of diffusing the pre-coated powder agent in the longitudinal direction of the exhaust port in the retention recess may be reduced due to the turbulence of the air flow due to the presence of the coating lump. In addition, it is possible to effectively prevent the formation of the coating lump as described above by preventing the paint mist from adhering to the wall surface portion of the upper edge of the exhaust port by discharging the air from the air discharge port. The function of diffusing in the longitudinal direction can also be stably maintained, so that the operation of the filter device and the operation of the equipment can be made more stable.

  In the implementation of the above configuration, various cross-sectional shapes, such as an arc shape and a polygonal shape, can be adopted as the specific cross-sectional shape of the retention recess when the exhaust port is viewed in the longitudinal direction (side wall lateral direction). What is necessary is just to select according to the wind speed of the paint mist containing air to perform, the material of a precoat powder agent, etc.

  Further, in order to cause the precoat powder agent and air ejected from the precoat agent nozzle to collide with the inner surface of the retention recess, the collision position is closer to the downstream side than the central portion of the retention recess in the air passage direction in the air introduction cylinder. If the pre-coating powder agent and air are ejected from the pre-coating agent nozzle, the vortex-like staying region formed in the staying recess is upstream of the downstream part of the staying recess in the air passage direction (i.e. , A portion between the upstream end of the retention recess and the precoat agent nozzle), thereby premix powder agent is mixed with the paint mist-containing air passing through the air introduction cylinder portion. The location can be biased toward the upstream end of the retention recess in the air passage direction.

  That is, the pre-coated powder agent in the paint mist-containing air sent to the dry filter can be promoted by the unevenness, and the diffusion of the pre-coated powder agent in the paint mist-containing air in the passage process of the air introduction cylinder portion can be promoted. Can be made more uniform.

  In the implementation of the above-described configuration, when the ninth feature configuration is implemented concurrently, the precoat powder agent for the filter ejected from the precoat agent nozzle and the paint mist adhesion prevention mixed with the discharge air from the air discharge port by the auxiliary agent mixing means The auxiliary powder for use may be either the same powder or a different powder.

According to a fifteenth feature configuration of the present invention, in the implementation of the fourteenth feature configuration,
The precoat agent nozzle is disposed in a state where the precoat powder agent and air collide obliquely with the inner surface of the retention recess.

  That is, according to this configuration, it is possible to prevent the precoat powder agent ejected together with the air from the precoat agent nozzle from adhering and accumulating on the inner surface of the retention concave portion due to the collision by the dissipation of the collision energy due to the oblique collision. In this way, even when the humidity of the paint mist-containing air sucked from the exhaust port is high or when the precoat powder is highly solidified, the diffusion of the precoat powder in the retention recess is stably and satisfactorily maintained. Can do.

  Further, according to this configuration, the stagnation of the precoat powder agent ejected from the precoat agent nozzle and the air in the retention recess is promoted by the guide by the inner surface of the recess that causes the precoat powder agent to collide obliquely. Thus, it is possible to further promote the diffusion of the precoat powder agent in the retention recess in the longitudinal direction of the exhaust port.

  In the implementation of this configuration, in order to cause the precoat powder agent and air to collide obliquely with the inner surface of the retention recess, an arrangement configuration in which the ejection center axis of the precoat agent nozzle is inclined with respect to the vertical direction, or An arrangement in which the inner surface of the retention recess is inclined with respect to the horizontal, or an arrangement in which the ejection center axis of the precoat agent nozzle is inclined with respect to the vertical direction and the inner surface of the retention recess is inclined with respect to the horizontal. Any of these may be adopted.

According to a sixteenth feature of the present invention, in the implementation of the fourteenth or fifteenth feature,
While providing an upstream drooping wall in a vertical posture at the upstream end edge of the retention recess in the air passage direction in the air introduction tube portion,
In the air passage direction in the air introduction tube portion, a downstream hanging wall having a vertical posture is provided at the downstream end edge of the retention recess,
While guiding the precoat powder agent and air that has reached the upstream drooping wall in the vortex-like residence of the precoat powder agent and air in the dwelling recess, downward by the upstream drooping wall,
In the vortex retention of the precoat powder agent and air in the retention recess, the precoat powder agent and air reaching the downstream drooping wall are guided downward by the downstream drooping wall. .

  That is, according to this configuration, the pre-coated powder agent and the air in the diffusing state reaching the upstream end and the downstream end of the retention recess in the air passing direction in the air introduction cylinder in the vortex retention in the retention recess. By guiding downward by the upstream drooping wall and the downstream dripping wall, the precoat powder agent and air in a diffused state with respect to the flow of the paint mist-containing air in the upstream part and the downstream part of the air introduction cylinder part. It can be positively merged and mixed.

  That is, by this, the precoat powder agent can be mixed with the paint mist-containing air in a state of being effectively dispersed also in the height direction of the air introduction tube portion (short side direction of the exhaust port). , The distribution of the precoat powder in the air containing paint mist sent to the dry filter can be made more effective, and a protective layer for preventing the paint mist from adhering to the dry filter is formed on the surface of the dry filter. It can be formed well in a more uniform state.

  Further, according to the above configuration, an appropriate part of the precoat powder mixed with the flow of the paint mist-containing air by the downward flow formed by the guide by the upstream drooping wall or the downstream drooping wall It is also possible to reliably reach the bottom wall of the air introduction cylinder part and to form a layer of the pre-coated powder agent on the bottom wall, so that the paint mist is formed on the bottom wall of the air introduction cylinder part. Adhesion and deposition can also be effectively prevented.

  In particular, when the bottom wall of the air introduction cylinder is an inclined bottom wall as described later, which becomes lower toward the downstream side in the air passage direction, a part of the precoat powder is formed by the downward flow formed by the guide by the downstream drooping wall. To the downstream portion of the inclined bottom wall, and the reverse flow component to the upstream side along the inclined bottom wall of the downward flow after reaching the downstream portion of the inclined bottom wall (that is, run up the inclined bottom wall) The precoat powder agent that reaches the downstream portion of the inclined bottom wall can also be held in an expanded state on the inclined bottom wall by the air flow component), whereby the bottom wall of the air introduction tube portion is inclined to the inclined bottom wall. However, it is also possible to stably maintain the precoat powder agent layer for preventing coating mist adhesion formed on the inclined bottom wall.

  In the implementation of the above configuration, the upstream rising in the vertical posture that rises toward the upstream edge of the retention recess at the upstream edge of the bottom wall of the air introduction cylinder in the air passage direction of the air introduction cylinder. It is desirable to provide a wall.

  In other words, in the inside of the air introduction cylinder part, the air passing wind speed in the upper region is suppressed by the presence of the recess for retention (particularly, the presence of the upstream drooping wall), but if the upstream rising wall is provided as described above, The air passage wind speed can be suppressed even in the lower region inside the air introduction tube portion, and the air passage wind speed can be balanced between the upper region and the lower region in the air introduction tube portion. The introduction of the paint mist-containing air into the filter device through the section and the mixing of the precoat powder agent with respect to the flow of the paint mist-containing air can be kept smoother and more stable.

According to a seventeenth feature configuration of the present invention, in any one of the fourteenth to sixteenth feature configurations,
An air introduction air passage formed inside the air introduction tube portion by disposing an outlet side opening of the air introduction tube portion at a position lower than the exhaust port which is an entrance side opening, and a bottom wall of the air passage And the lower sloped air passage and the sloped bottom wall that become lower toward the downstream side in the air passage direction, and the dry filter is disposed at a position higher than the outlet side opening of the air introduction cylinder part,
In the filter device, the air that has passed through the first descending air introduction air passage of the air introduction tube portion is suddenly changed in an upward state toward the dry filter in the filter device.

  That is, in this configuration, the paint mist-containing air is obliquely downwardly directed from the higher inlet side opening (that is, the exhaust port) toward the lower outlet side opening through the air introduction air passage with the first descending slope inside the air introduction cylinder portion. Following the passage, the paint mist-containing air is directed to a dry filter higher than the outlet side opening of the air introduction tube portion by changing the direction from the obliquely downward direction to the upward direction.

  That is, this large change in direction can further promote the diffusion of the precoat powder mixed with the paint mist-containing air in the process of passing through the air introduction cylinder in the paint mist-containing air, and is sent to the dry filter. The distribution of the precoat powder in the mist-containing air can be made more uniform.

  In addition, according to this configuration, even if the paint mist contained in the paint mist-containing air is deposited on the inclined bottom wall of the air introduction cylinder portion in a mixed state with the precoat powder agent, When there is a pre-coated powder agent layer on the inclined bottom wall as shown above, combined with the effect of preventing the adhesion of the powder agent layer, the mixed deposit is quickly removed from the air introduction cylinder portion of the filter device. From this, the operation of the filter device can be maintained well and stably, and maintenance such as cleaning of the air introduction tube portion can be facilitated.

  In the implementation of the above configuration, the discharge means is provided below the dry filter at a position lower than the opening on the outlet side of the air introduction cylinder, and the exhaust gas is exhausted in a state in which the peel mixture peeled off from the dry filter is received by the discharge means. It is desirable to have a configuration in which it is conveyed in the mouth longitudinal direction (side wall width direction) and carried out of the filter device.

  That is, the collected deposit layer on the surface of the dry filter (in other words, formed on the surface of the dry filter) consisting of a mixture of the paint mist contained in the paint mist-containing air and the precoat powder mixed with the paint mist-containing air. When a deposited layer in which the collected paint mist is mixed with a protective layer made of a precoat powder is grown to some extent, the collected layer is separated from the dry filter by an appropriate means to regenerate the dry filter. If such a carrying-out means is provided, it is possible to efficiently carry out the peeling mixture falling by this filter regeneration and the peeling mixture that peels off from the dry filter during normal operation.

  In addition, after passing through the air introduction cylinder part, a falling mixture formed by combining paint mist and precoat powder in the process up to the dry filter, or precoat powder falling in the process up to the dry filter The body agent and the like can be carried out of the filter device by the carry-out means together with the peeling mixture falling from the dry filter, thereby facilitating maintenance of the filter device.

  Furthermore, in the implementation of the above-described configuration, it is desirable to provide a soaring prevention guide plate that protrudes in a horizontal posture from the lower edge portion at the outlet side opening of the air introduction tube portion toward the carry-out means.

  That is, by providing such a soaking prevention guide plate, the soaking prevention guide plate prevents the air current of the paint mist-containing air that has passed through the air introduction cylinder part from affecting the carrying means. The paint mist-containing air can be directed upwards and directed to the dry filter.

  That is, it is possible to prevent the light weight powdery component in the mixture unloaded by the unloading means below the dry filter from being lifted up by the paint mist-containing air that has passed through the air introduction cylinder. It is possible to send a coating mist-containing air mixed with only the fresh precoat powder supplied from the precoat agent nozzle to the dry filter, so that a good protective layer consisting only of the fresh precoat powder is formed on the surface of the dry filter. Can be formed.

According to an eighteenth feature configuration of the present invention, in any one of the first to seventeenth feature configurations,
The exhaust chamber is an air guide chamber that receives air discharged downward from a coating chamber disposed immediately above the exhaust chamber and paint mist contained therein and guides it to the exhaust port.

  That is, according to this configuration, it is possible to effectively prevent the paint mist from adhering to the upper edge wall surface portion of the exhaust port in the exhaust chamber, which is the air guide chamber, and to reduce the burden of the cleaning work. By preventing operational troubles caused by the paint lump, it is possible to increase the operation rate of the painting work in the painting room and increase the production efficiency of the coated product.

According to a nineteenth feature configuration of the present invention, in any one of the first to fifteenth feature configurations,
The exhaust chamber is a coating operation chamber that discharges excess spray paint mist generated in a painting operation performed in the chamber together with room air from the exhaust port.

  That is, according to this configuration, as in the eighteenth feature configuration, it is possible to effectively prevent the paint mist from adhering to the upper edge wall surface portion of the exhaust port in the exhaust chamber as described above, and to reduce the burden of the cleaning work. At the same time, since it is possible to prevent operational troubles caused by the paint lump, it is possible to increase the operation rate of the painting work in the exhaust chamber, which is a painting work room, and to improve the production efficiency of the coated product.

Cross section of painting booth Side view of painting booth Schematic sectional view of the main part Structure diagram of main parts Cross-sectional view of a painting booth showing another embodiment Cross-sectional view of a simple paint booth showing another embodiment Schematic cross-sectional view of the main part showing another embodiment Front view of essential parts showing other embodiments Schematic cross-sectional view of the main part showing another embodiment Schematic cross-sectional view of the exhaust port portion showing another embodiment Comparison chart showing paint mist adhesion Cross section of conventional painting booth

  1 and 2 show a painting booth. This painting booth is provided with a painting chamber 2 for painting an object 1 (in this example, an automobile body) with a painting gun G. Equipped with a transport device 3 for transport.

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

  Below the coating chamber 2, an exhaust chamber 4 is formed as a wind guide chamber extending in the conveying direction of the article 1 as in the coating chamber 2. The exhaust chamber 4 is a ventilation air for the coating chamber 2. The exhaust air EA discharged downward from the coating chamber 2 through the lattice floor 2b with the supply of SA is received.

  This exhaust air EA contains surplus spray (overspray) floating paint mist generated in the painting operation in the painting chamber 2, and as the ventilation air SA is supplied from the ceiling 2 a of the painting chamber 2. By discharging the indoor air EA in the painting chamber 2 to the lower exhaust chamber 4 in a piston flow, the floating paint mist generated in the painting chamber 2 is quickly and reliably removed from the painting chamber 2. The coating quality is kept high and the working environment of the painting chamber 2 is kept good.

  The chamber width of the exhaust chamber 4 is made smaller than the chamber width of the coating chamber 2, and recessed portions 17 are formed on both sides of the exhaust chamber 4 below the coating chamber 2. The filter device 5, which is an example of a processing device, is juxtaposed side by side in the longitudinal direction of the coating booth that is the conveying direction of the article 1 with the filter device 5 being close to the side wall 4 a of the exhaust chamber 4. (This includes the case where the device 5 is also used as the device case portion on the exhaust chamber side of the device 5).

  That is, the exhaust air EA from the painting chamber 2 is sent to these filter devices 5 after being received in the exhaust chamber 4, and is contained in the exhaust air EA from the bag filter 8 (an example of a dry filter) built in these filter devices 5. The paint mist is collected and the exhaust air EA is purified.

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

  Each filter device 5 is internally provided with a plurality of bag filters 8 arranged in a suspended position and in a vertical state in plan view.

  On both side walls 4a of the exhaust chamber 4, slit-shaped or rectangular exhaust ports 10a extending in the width direction of the side wall 4a (that is, the coating booth longitudinal direction) near the bottom wall 4b of the exhaust chamber 4 are provided at predetermined intervals on the side wall 4a. The air introduction tube portions 10 having a slit-like or rectangular cross-sectional shape similar to the exhaust ports 10a are extended from the respective exhaust ports 10a to the filter device 5 side. .

  Two adjacent air introduction cylinders 10 are connected to the lower part of the exhaust chamber side case portion 9a of the device case 9 of each filter device 5 so that the air introduction tube portion 10 is located below the interior bag filter 8 and inside the filter device 5. Exhaust air EA that has been opened and received in the exhaust chamber 4 is introduced into each filter device 5 through the air inlet cylinder 10 from these exhaust ports 10a.

  That is, exhaust air EA (paint mist-containing air) from the coating chamber 2 is discharged from the exhaust chamber 4 to the exhaust port 10a and the air by the suction force applied by the exhaust fan 7 through the exhaust duct 6 connected to the upper end of the device case 9. It introduces into the filter device 5 through the introduction cylinder part 10.

  The air introduction cylinder portion 10 is equipped with a precoat agent nozzle 11 for mixing the precoat powder agent P for the filter with the exhaust air EA (that is, the paint mist-containing air to be sent to the bag filter 8) passing therethrough, By sending the precoat powder agent P ejected from the precoat agent nozzle 11 to the bag filter 8 together with the exhaust air EA, a protective layer made of the precoat powder agent P on the surface of the bag filter 8 (specifically, the exhaust air EA A deposited layer of the precoat powder P in which the paint mist therein is mixed in a dispersed state.

  That is, the paint filter mist in the exhaust air EA is collected by the bag filter 8 in a state where the paint layer is prevented from directly adhering to the surface of the bag filter 8 by the protective layer.

  On the inner surface side of the upper wall of the air introduction cylinder portion 10, as shown in FIG. 3, a retention recess 12 having a concave cross-sectional shape that opens downward in a cross-sectional shape when viewed in the longitudinal direction of the exhaust port 10 a (as viewed in the longitudinal direction of the coating booth). It is formed continuously in the longitudinal direction of the exhaust port 10a (the lateral width direction of the side wall 4a), and in the air passage direction in the air introduction tube portion 10, the upstream end edge of the retention recess 12 has the exhaust chamber 4 The vertical hanging wall 12a in the vertical position connected to the side wall 4a is provided, and similarly, the downstream hanging wall 12b in the vertical position is provided at the downstream edge of the retention recess 12.

  Further, the upstream edge of the bottom wall 13 (lower wall) of the air introduction cylinder part 10 in the air passage direction in the air introduction cylinder part 10 is connected to the upstream edge of the retention recess 12 (that is, the upstream drooping wall 12a). ) Is provided with an upstream rising wall 13a in a vertical posture.

  The outlet side opening 10b of the air introduction cylinder part 10 (that is, the opening formed between the lower end part of the downstream drooping wall 12b and the downstream end part 13b of the bottom wall 13) is the inlet side of the air introduction cylinder part 10. It is arranged at a position lower than the exhaust port 10a which is an opening (that is, an opening formed between the lower end portion of the upstream drooping wall 12a and the upper end portion of the upstream rising wall 13a). The air introduction air passage formed inside and the bottom wall of the air passage (that is, the bottom wall 13 of the air introduction cylinder portion 10) are a slanted air passage and an inclined bottom wall that are lowered downward toward the downstream side in the air passage direction. It is.

  In other words, the exhaust air EA that has passed through the air introduction air passage having the downward slope in the air introduction cylinder portion 10 is suddenly changed in the upward air flow state toward the upper dry filter 8 inside the filter device 5. .

  In the air introduction cylinder portion 10 having such a structure, the precoat agent nozzle 11 that ejects the precoat powder agent P together with the compressed air is used for staying in the central portion of the air introduction cylinder portion 10 in the longitudinal direction (lateral width direction) of the exhaust port. It arrange | positions in the state which ejects the precoat powder agent P and compressed air toward the back inner surface of the recessed part 12. FIG.

  In other words, the precoat agent nozzle 11 is brought into a state in which the precoat powder agent P and the compressed air collide with the inner surface of the inner portion of the recess 12 for retention at the central portion in the exhaust port longitudinal direction (lateral width direction) of the air introduction tube portion 10. It is arranged.

  That is, by ejecting the precoat powder agent P together with the compressed air toward the inner surface of the back portion of the retention recess 12 in this way, the airflow accompanied by the precoat powder agent P is swirled over an appropriate time (in the figure). A vortex dwelling as indicated by a solid arrow) occurs in the dwelling recess 12.

  That is, by this vortex-like residence, the precoat powder P is diffused in the longitudinal direction of the exhaust port in the retention recess 12 that continues in the longitudinal direction of the exhaust port (that is, the lateral width direction of the air introduction cylinder 10) with stirring. Then, the diffused precoat powder P is gradually taken into the passing flow of the exhaust air EA in the air introduction cylinder portion 10 and uniformly dispersed in the exhaust port longitudinal direction (the lateral width direction of the air introduction cylinder portion 10). In this state, the pre-coated powder agent P is mixed in the flow of the exhaust air EA.

  Further, in the state in which the passing air speed of the exhaust air EA is equalized in the vertical direction of the air introduction cylinder portion 10 by the upstream drooping wall 12a in the retention recess 12 and the upstream rising wall 13a in the inclined bottom wall 13, the retention recess 12 The pre-coated powder agent P in the diffusion state in the retention recess 12 is guided downward together with the air by the upstream-side dripping wall 12a and the downstream-side dripping wall 12b, respectively. The pre-coated powder is effectively dispersed also in the height direction (short side direction), and by the reverse flow component to the upstream side after reaching the inclined bottom wall 13 of the downward flow formed by the guide by the downstream side hanging wall 12b. The pre-coated powder agent layer on the inclined bottom wall 13 that keeps a part of the body agent P spread on the inclined bottom wall 13 and prevents the coating mist from adhering to the inclined bottom wall 13 is reduced. To maintain.

  Further, the outlet side opening 10b of the air introduction cylinder part 10 is set lower than the exhaust port 10a which is the inlet side opening, and the exhaust air EA which has passed the air introduction cylinder part 10 obliquely downward downward is directed upward as described above. By greatly changing the direction of the airflow to the upper bag filter 8, diffusion of the precoat powder P mixed with the exhaust air EA in the exhaust air EA is further promoted.

  The ejection port 11a of the precoat agent nozzle 11 is arranged substantially vertically upward at a position closer to the downstream side than the central portion of the retention recess 12 in the air passage direction of the air introduction tube portion 10, whereas The portion of the inner surface of the recess 12 where the precoat powder P and the compressed air collide is an inclined surface 12c in a posture substantially parallel to the inclined bottom wall 13, and the central axis of the precoat agent nozzle 11 ejected from the inclined surface 12c. Are arranged obliquely (that is, the precoat powder P and the compressed air collide in an oblique direction against the inner surface of the back portion of the retention recess 12).

  In other words, this oblique arrangement prevents the precoat powder agent P ejected from the precoat agent nozzle 11 from adhering to and depositing on the inner surface of the inner portion of the recess 12 for retention, and mainly retains the aforementioned vortex-like residence area. The upstream portion of the retention recess 12 is formed upstream of the retention recess 12 in order to secure a diffusion time after mixing the portion where the precoat powder P is mixed into the exhaust air EA passing through the air introduction cylinder portion 10. It is biased toward the end side.

  Inside the filter device 5, a belt conveyor 14 is provided as a carry-out means below the bag filter 8 and below the outlet side opening 10 b of the air introduction cylinder portion 10, and this belt conveyor 14 is arranged in a row in the coating booth longitudinal direction. A plurality of filter devices 5 arranged in a line are provided.

  That is, the collected deposit that peels off from the surface of the bag filter 8 (that is, the mixture of the paint mist and the precoat powder P), and the precoat powder P and the paint mist in the process of reaching the bag filter 8. A falling mixture or the like produced by combining the two is conveyed in the longitudinal direction of the coating booth while being received by the belt conveyor 14 and is discharged from each filter device 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.

  In addition, in the vicinity of the upper part of the bag filter 8 in the filter device 5, a peeling device 15 for jetting compressed air in a pulse manner is provided, and the surface of the bag filter 8 made of a mixture of paint mist and precoat powder P When the collected deposit layer above grows to some extent, this peeling device 15 causes the compressed air to act on each bag filter 8 from the downstream side in the air passage direction, thereby causing the collected deposit layer to be bugged. The filter 8 is forcibly separated from the surface of the filter 8 and dropped on the belt conveyor 14.

  From the downstream end of the inclined bottom wall 13 in the air introduction cylinder part 10, a guide plate 16 for preventing the soaring protruding in a horizontal posture is provided continuously to the upper area of the belt conveyor 14, and the discharge after passing through the air introduction cylinder part 10 is provided. By directing the air EA to the upper bag filter 8 under the guidance of the soaring prevention guide plate 16, the light powdery portion of the fallen mixture received on the belt conveyor 14 is swept by the discharged air EA. It is prevented from being raised.

  On the other hand, in the vicinity of the upper side of each exhaust port 10 a on the side wall 4 a of the exhaust chamber 4, a slit-like air discharge port 20 for discharging paint mist adhesion preventing air A obliquely downward into the exhaust chamber 4 is provided as an exhaust port. 10a is provided so as to extend over the entire length in the longitudinal direction, and a wall surface portion of the peripheral edge of the exhaust port 10a in the side wall 4a by the air discharge from the air discharge port 20 (particularly, an upstream drooping wall that becomes a part of the side wall 4a The coating mist is prevented from being deposited on the wall of the upper edge of the exhaust port 10a represented by the side wall surface of the exhaust chamber 12a.

  That is, in the exhaust chamber 4, exhaust air EA (air containing paint mist) received from the coating chamber 2 concentrates on the exhaust port 10 a below the side wall 4 a and is sucked into the exhaust port 10 a at a high speed. Since the exhaust air EA that flows downward from the upper part and reaches the exhaust port 10a suddenly changes in the horizontal direction and is sucked into the exhaust port 10a, the wall surface portion of the side wall 4a around the exhaust port 10a (particularly as described above) The paint mist tends to adhere and deposit on the wall surface portion of the upper edge of the exhaust port 10a.

  Further, a coating lump is formed on the wall surface portion around the exhaust port 10a due to the adhesion and deposition of the coating mist, and pre-coating in the retention recess 12 in the air introduction cylinder 10 due to the disturbance of the air flow due to the presence of the coating lump. The diffusion function of the powder agent P may be reduced, or troubles such as clogging of the bag filter 8 may occur due to the paint lump peeled off by the high-speed airflow at the exhaust port 10a being carried to the bag filter 8. is there.

  On the other hand, as described above, the air A is discharged from the air discharge port 20 to the inside of the exhaust chamber 4 in the vicinity of the upper side of the exhaust port 10a, so that the exhaust air EA (particularly, the exhaust chamber 4) The discharge air A from the air discharge port 20 is interposed in the form of an air layer between the exhaust air from the upper part to the exhaust port 10a) and the exhaust port upper edge wall surface portion (including the air discharge port 20) in the side wall 4a. In this way, this intervening air layer prevents the deposition of paint mist on the wall surface portion around the exhaust port 10a (particularly, the wall surface portion on the upper edge of the exhaust port 10a).

  Specifically, in order to provide the air discharge port 20 on the side wall 4a of the exhaust chamber 4, as shown in FIG. 4, an opening 21 for forming a discharge port is provided on the side wall 4a (side wall main body portion). In a state where the inside of the air supply box 22 is opened into the exhaust chamber 4 through the opening 21, the air supply box 22 is disposed on the back side of the side wall 4a and attached to the side wall 4a.

  And the discharge port formation wall part 24 (a part of side wall 4a) which formed the air discharge port 20 is the state which obstruct | occluded the opening 21 for discharge port formation, and the box opening 22a of the air supply box 22 facing it thereby. It is detachably attached to the side wall 4a from the inside of the exhaust chamber 4.

  In other words, the discharge port forming wall portion 24 in which the air discharge port 20 is formed is detachably attached to the side wall 4 a as a lid for the box opening 22 a of the air supply box 22.

  Further, similarly to the air discharge port 20, the discharge port forming wall portion 24 is provided with a flat rectangular tube-shaped airflow guide tube 25 having a slit-like cross-sectional shape extending in the longitudinal direction (lateral width direction) of the exhaust port. To the inside of the air supply box 22 so as to extend linearly in an obliquely upward inclined state.

  In the air supply box 22, a connection port 27 for the air supply path 26 for supplying air is provided on the back side of the side wall 4 a, and the formation portion of the connection port 27 is locally enclosed inside the air supply box 22. The front porous dispersion plate 28a (for example, a punching plate having an aperture ratio of about 10%) arranged in a state and the air supply box 22 between the front porous dispersion plate 28a and the airflow guide tube 25 are arranged. A fine downstream porous dispersion plate 28b (for example, a punching plate having an aperture ratio of about 3%) is provided over the entire longitudinal section.

  That is, in this structure, air A supplied from the connection port 27 to the inside of the air supply box 22 through the air supply passage 26 is discharged obliquely downward from the air discharge port 20 with a static pressure in the air supply box 22. There is an air flow guide tube 25 that linearly extends from the air discharge port 20 to the inside of the air supply box 22 while having a structure in which the air discharge port 20 (specifically, a forming member thereof) does not protrude into the exhaust chamber 4. By setting this inclination angle, the discharge direction of the air A from the air discharge port 20 is defined to be obliquely downward with a desired inclination angle.

  Further, the air A supplied to the inside of the air supply box 22 through the air supply path 26 is passed through the porous dispersion plates 28a and 28b at the front stage and the rear stage, thereby supplying the air flow distribution inside the air supply box 22. The air box 22 is made uniform in the vertical cross-sectional direction, thereby making the distribution of the discharge air A in the air discharge port 20 (particularly, the distribution in the longitudinal direction (lateral width direction) of the air discharge port 20) uniform.

  That is, the discharge direction of the air A from the air discharge port 20 is regulated in this way, and the distribution of the discharge air A at the air discharge port 20 is made uniform, so that the peripheral wall surface portion of the exhaust port in the side wall 4a (particularly the exhaust gas). Adhering and accumulating paint mist on the upper edge wall surface portion is effectively and reliably prevented over the entire length of the exhaust port 10a.

  The air discharge air volume from the air discharge port 20 is preferably 1% to 20% of the air intake air flow from the exhaust port 10a, and the air discharge air speed at the air discharge port 20 is 0.2 m / s to 10 m. / S is desirable.

[Other Embodiments]
FIG. 5 shows a painting booth having a structure different from that of the painting booth of the above-described embodiment. In this painting booth, a filter device is provided on both lateral outer sides of the exhaust chamber 4 having the same width as the upper painting chamber 2. 5 are juxtaposed in a line in the longitudinal direction of the coating booth with the side walls 4a of the exhaust chamber 4 being close to each other.

  And the slit-shaped or rectangular-shaped exhaust port 10a provided in the lower part of the side wall 4a, the air introduction cylinder part 10 extended from each exhaust port 10a to the filter apparatus 5 side, and the inner surface of the recessed part 12 for a residence are pre-coated powder The precoat agent nozzle 11 that ejects the agent P, the air discharge port 20 provided in the side wall 4a near the upper side of each exhaust port 10a, and the like have the same configuration as in the above-described embodiment.

  FIG. 6 shows a simple painting booth. In this simple painting booth, the exhaust chamber 4 itself provided with the slit-shaped or rectangular exhaust port 10a as described above is used as a painting work chamber, and painting work is performed by a painting gun G in the room. The indoor air EA containing the excessive spray paint mist generated in the painting operation is discharged from the exhaust port 10a.

  The exhaust port 10a is formed near the bottom wall 4b of the exhaust chamber 4 on the side wall 4a opposite to the coating gun G with respect to the workpiece 1, and exhaust air EA from the exhaust chamber 4 is generated through the exhaust port 10a. The filter device 5 to be introduced is adjacent to the exhaust chamber 4 in a state where the side wall 4a in which the exhaust port 10a is formed is also used as a device case portion on the exhaust chamber side of the filter device 5.

  Further, in this simple painting booth, a collecting container 29 is arranged below the filter device 15 in place of the belt conveyor 14 as described above as a means for receiving the collected mixture that is peeled off from the bag filter 8 in the filter device 5. is there.

  And the air introduction cylinder part 10 extended to the filter apparatus 5 side from the exhaust port 10a, the precoat agent nozzle 11 which ejects the precoat powder agent P toward the inner surface of the recessed part 12 for retention, The upper side vicinity of each exhaust port 10a The air discharge port 20 provided on the side wall 4a at a location has the same configuration as that of the above-described embodiment.

  FIG. 7 shows another embodiment of the air discharge port 20. In providing the air discharge port 20, an auxiliary powder agent P ′ for preventing paint mist adhesion is introduced into the exhaust chamber 4 as shown in FIG. The auxiliary agent ejection port 30 to be ejected may be provided at the central portion in the longitudinal direction (the depth direction of the drawing) of the exhaust port 10a in the portion between the exhaust port 10a on the side wall 4a and the air discharge port 20 on the upper side. .

  The auxiliary powder agent P ′ ejected from the auxiliary agent ejection port 30 is mixed with the air A after being ejected from the air ejection port 20, and together with the ejection air A from the air ejection port 20, the periphery of the exhaust port 10 a in the side wall 4 a. The paint mist is prevented from adhering to the wall surface portion (particularly, the wall surface portion of the upper edge of the exhaust port 10a).

  In other words, the auxiliary powder agent P ′ ejected from the auxiliary agent ejection port 30 is caused by the air ejection from the air ejection port 20, the paint mist-containing air EA from the upper part of the exhaust chamber 4 to the exhaust port 10 a, and the upper edge wall surface of the exhaust port. It mixes with the above-mentioned intervening air layer formed between the portions, and prevents the paint mist from adhering to the peripheral wall portion of the exhaust port 10a by cooperating with the intervening air layer.

  That is, the auxiliary agent ejection port 30 functions as an auxiliary agent mixing means for mixing the auxiliary powder agent P ′ for preventing the coating mist from adhering to the air A discharged from the air discharge port 20.

  The auxiliary agent mixing means for mixing the auxiliary powder agent P ′ with the discharge air A from the air discharge port 20 employs, for example, an in-box injection means for blowing the auxiliary powder agent P ′ into the air supply box 22. In some cases, the auxiliary powder P ′ may be mixed with the air A before being discharged from the air discharge port 20.

  Further, when the precoat agent nozzle 11 for ejecting the filter precoat powder agent P toward the inner surface of the retention recess 12 is provided in the air introduction cylinder portion 10 following the exhaust port 10a, the same powder as the precoat powder agent P is provided. You may make it use a body agent as auxiliary powder agent P '.

  As shown in FIG. 7B, the air discharge port 20 may have a relatively large opening area and may discharge air horizontally into the exhaust chamber 4.

  Further, in this case, instead of providing the porous dispersion plate 28b over the entire longitudinal section of the air supply box 22 inside the air supply box 22, as shown in FIG. A porous air diffuser plate 31 may be provided over the entire surface, thereby making the distribution of the discharge air A at the air discharge port 20 uniform.

  As shown in FIG. 7 (c), a plurality of air discharge ports 20 may be provided in the vertical direction.

  Although this configuration is suitable for a case where all of the plurality of air discharge ports 20 discharge air obliquely downward as shown in FIG. 7C, the air discharge port 20 that discharges air horizontally is inclined. The air discharge ports 20 for discharging air downward may be provided side by side in the vertical direction, or a plurality of air discharge ports 20 for discharging air in the horizontal direction may be provided side by side. Alternatively, the air discharge ports 20 that discharge air obliquely downward and the air discharge ports 20 that discharge air downward as described below are arranged in the vertical direction, or a plurality of air discharge ports 20 that discharge air downward are arranged in the vertical direction. You may make it provide.

  Further, when the plurality of air discharge ports 20 are provided in the vertical direction in this way, it is desirable that the air supply box 22 for the plurality of air discharge ports 20 be shared as shown in FIG.

  As shown in FIG. 8, the air discharge port 20 (that is, the upper portion) discharges the air A for preventing paint mist adhesion horizontally, obliquely downward or downward from the vicinity of the upper side of the exhaust port 10a to the inside of the exhaust chamber 4. In addition to providing an air discharge port), the exhaust port 10a is horizontally or obliquely downwardly or obliquely laterally inclined toward the exhaust port 10a from the vicinity of both lateral sides of the exhaust port 10a or the exhaust port 10a. You may make it the structure which provides the side part air discharge port 20A which discharges the air A for paint mist adhesion prevention sideways facing the side.

  Further, in this case, as shown in FIG. 8, both the upper air outlet 20 and the side air outlet 20A are horizontal through a porous diffuser plate 31 (see FIG. 7B) provided on the opening surface. Air may be discharged in the direction, and the opening surface of the upper air discharge port 20 and the opening surface of the side air discharge port 20A may be continuous.

  Further, the air supply box 22 for the upper air discharge port 20 and the air supply box 22 for the side air discharge port 20A may be shared.

  FIG. 9 shows still another embodiment of the air discharge port 20. As shown in FIG. 9A, the air supply box 22 is disposed on the indoor side of the exhaust chamber 4 and attached to the side wall 4 a. Air may be discharged downward from the air discharge port 20 provided in the lower wall portion (lower surface portion) into the exhaust chamber 4.

  Further, in this case, as shown in FIG. 9B, the upper wall portion 22b of the air supply box 22 is formed as an inclined upper wall portion closer to the inside of the exhaust chamber 4 toward the lower side thereof. You may make it prevent the paint mist adhesion to the air supply box 22 which is the formation member of 20.

  That is, by the airflow guidance by the inclined upper wall portion 22b, the indoor air EA flowing downward from the upper portion of the exhaust chamber 4 along the side wall 4a together with the paint mist contained therein is formed at the location where the air discharge port 20 is formed. As a result, the direction of the forming member (the air supply box 22) is gradually and smoothly changed toward the exhaust chamber, thereby preventing the coating mist from adhering to the forming member of the air discharge port 20.

  In addition to or instead of the side air outlet 20A as described above, air for preventing paint mist adhesion is discharged horizontally, obliquely upward, or upwardly into the exhaust chamber 4 from a location near the lower side of the exhaust port 10a. The lower air outlet may be provided on the side wall 4 a of the exhaust chamber 4 together with the upper air outlet 20.

  The specific cross-sectional shape of the retention recess 12 provided in the air introduction cylinder portion 10 extending from the exhaust port 10a in the longitudinal direction (horizontal direction view) of the exhaust port can be variously changed such as various polygonal shapes and arc shapes. Further, as shown in FIGS. 10 (a) and 10 (b), a shape in which a recess is further provided in the back of the stay recess 12 or a back of the stay recess 12 as shown in FIG. 10 (c). You may employ | adopt the shape etc. which make all the inner surfaces into the inclined surface which becomes low level toward the downstream.

  In addition, the posture of the precoat agent nozzle 11 that ejects the precoat powder agent P toward the inner surface of the retention recess 12 is also various postures in which the ejection center axis is oblique or orthogonal to the inner surface of the retention recess 12. May be employed, and may be arranged in a posture as shown in FIGS.

  The specific cross-sectional shape and structure of the air inlet tube portion 10 extending from the exhaust port 10a in the longitudinal direction (horizontal direction view) of the exhaust port are not limited to the shape and structure shown in the above-described embodiment, and the inner surface side of the upper wall Various modifications can be made in relation to the retention recess 12 provided on the exhaust side. In some cases, the exhaust port 10a and the outlet side aperture 10b, which are the inlet side openings, are arranged at the same height, or conversely The opening 10b may be disposed at a higher position than the exhaust port 10a.

  Precoat powder P for filter and auxiliary powder P 'for preventing paint mist adhesion include calcium carbonate powder, caustic soda powder, slaked lime powder, calcium hydroxide powder, calcium silicate powder, zeolite Various powdery substances such as powder, rock powder, aluminum oxide powder, silicon oxide powder, powder paint, etc. can be used depending on the properties of the paint mist, especially binding with paint mist Those that can reduce the adhesiveness of the paint mist, and those having a deodorizing effect, a sterilizing effect, and the like are preferable.

  The paint mist processing device that introduces the paint mist-containing air EA from the exhaust chamber 4 through the exhaust port 10a is not limited to the dry filter device 5 including various types of dry filters 8, and is a filter medium for collecting paint mist. For collecting paint mist contained in the air EA passing through the exhaust port 10a, such as a wet filter device that cleans and regenerates water with a cleaning liquid such as water, and a scrubber device that collects paint mist with spray liquid. Any apparatus may be used as long as it performs various processes such as detoxification and detoxification processes.

  FIG. 11 shows a comparison result between a conventional exhaust system that does not have the air discharge port 20 and an exhaust system that has the air discharge port 20, and FIG. 11A is a side sectional view of the exhaust system that has no air discharge port 20. FIG. 11B is a cross-sectional side view and a front view of the exhaust system provided with the air discharge port 20 (upper air discharge port) shown in the above embodiment, and FIG. 11C is FIG. FIG. 6 is a side sectional view and a front view of an exhaust facility provided with an upper air discharge port 20 and a side air discharge port 20A as shown in FIG. 5, both of which indicate that the higher the black density portion, the higher the paint mist concentration. .

  As can be seen from the comparison result of FIG. 11, in the conventional exhaust facility shown in FIG. 11A in which the air discharge port 20 is not provided, the paint mist adheres to the wall surface portion around the exhaust port 10a. In the exhaust facility shown in FIG. 11B provided with the air discharge port 20 (upper air discharge port), the coating mist adhesion to the wall surface portion of the upper edge of the exhaust port 10a is effectively reduced.

  Further, in the exhaust system shown in FIG. 11C provided with the upper air outlet 20 and the side air outlet 20A, the paint mist adhesion to the wall surface portion of the upper edge of the exhaust outlet 10a is effectively reduced and the exhaust The coating mist adhesion to the wall surface portions of both side edges of the mouth 10a is also effectively reduced.

  The exhaust system according to the present invention can be used in various facilities in various fields as long as it is a facility that requires exhaust processing of air including paint mist, including a paint booth.

DESCRIPTION OF SYMBOLS 4 Exhaust chamber 4b Bottom wall 4a Side wall, side wall main body 10a Exhaust port EA Air containing paint mist 5 Paint mist processing device, filter device A Air for preventing paint mist adhesion 20 Air discharge port 24 Discharge port forming wall part, lid 22 Air supply box 22a Box opening 26 Air supply path 27 Air supply path connection part 25 Air flow guide tube 28b Porous dispersion plate 31 Porous diffuser plate P 'Auxiliary powder agent for preventing paint mist adhesion 30 Auxiliary agent mixing means 20A Side air discharge port 8 Dry filter 10 Air introduction cylinder 12 Retention recess P Precoat powder for filter 12c Inclined inner surface of retention recess 11 Precoat agent nozzle 12a Upstream drooping wall 12b Downstream drooping wall 10b Outlet opening 13 Bottom wall of the air introduction cylinder part 2 Painting room

Claims (19)

Near the bottom wall of the exhaust chamber, a slit-shaped or rectangular exhaust port having a longitudinal direction in the width direction of the side wall is provided on the side wall of the exhaust chamber, and the paint in the exhaust chamber containing the paint mist is sucked from the exhaust port. An exhaust system leading to a mist processing device,
An air discharge port that discharges air for preventing paint mist adhesion from the vicinity of the upper side of the exhaust port to the inside of the exhaust chamber is disposed on the side wall so as to extend over the entire length in the longitudinal direction of the exhaust port. Some exhaust equipment.   2. The exhaust system according to claim 1, wherein the air discharge port is configured to discharge air for preventing paint mist adhesion into the exhaust chamber horizontally or obliquely downward.   2. The exhaust system according to claim 1, wherein the air discharge port is configured to discharge air for preventing paint mist adhesion downward into the exhaust chamber. In the state where the box opening of the air supply box is closed by the discharge port forming wall part which is the wall part in which the air discharge port is formed among the side walls, the air supply box is disposed on the back side of the side wall and is disposed on the side wall. attachment,
The exhaust system according to any one of claims 1 to 3, wherein air supplied to the inside of the air supply box through an air supply path is discharged from the air discharge port into the exhaust chamber.   The exhaust system according to claim 4, wherein the discharge port forming wall portion is detachably attached to the main body portion of the side wall as a lid for the box opening. An airflow guide tube linearly extending from the air outlet to the inside of the air supply box is provided,
The exhaust system according to claim 4 or 5, wherein an air discharge direction of the air from the air discharge port is defined by sending air in the air supply box to the air discharge port through the air flow guide tube.   The exhaust system according to claim 6, wherein a porous dispersion plate that covers the entire longitudinal section of the air supply box is provided between the connection portion of the air supply path and the airflow guide tube inside the air supply box.   The exhaust system according to any one of claims 1 to 5, wherein the air discharge port is provided with a porous diffuser plate over the entire opening surface.   9. An auxiliary agent mixing means for mixing auxiliary powder agent for preventing paint mist adhesion to air after being discharged from the air discharge port or to air before being discharged from the air discharge port is provided. The exhaust system according to claim 1.   The exhaust system according to any one of claims 1 to 9, wherein an air discharge air amount from the air discharge port is set to 1% to 20% of an air intake air amount from the exhaust port.   The exhaust system according to any one of claims 1 to 10, wherein an air discharge wind speed at the air discharge port is set to 0.2 m / s to 10 m / s.   The exhaust system according to any one of claims 1 to 11, wherein a plurality of the air discharge ports are arranged in the vertical direction.   A side air discharge port that discharges air for preventing paint mist adhesion from the vicinity of both sides of the exhaust port to the inside of the exhaust chamber is arranged to extend across the entire width of the exhaust port in the height direction. The exhaust equipment according to any one of claims 1 to 12, wherein the exhaust equipment is provided on the side wall. As the paint mist treatment device, a filter device that collects paint mist in the air with a dry filter is disposed in the state of being close to the side wall outside the exhaust chamber, and connected to the outlet side of the exhaust port,
On the inner surface side of the upper wall of the air introduction cylinder portion extended from the exhaust port to the filter device side, a retention recess having a concave cross-sectional shape that opens downward in a cross-sectional shape in the longitudinal direction of the exhaust port is provided in the exhaust. Formed continuously in the longitudinal direction of the mouth,
In a state where a precoat powder agent for a filter mixed with air introduced into the filter device from the exhaust port through the air introduction tube portion collides with the inner surface of the retention recess at a predetermined position in the longitudinal direction of the exhaust port, Provided with a precoat agent nozzle that ejects a precoat powder agent together with air toward the inner surface of the retention recess,
The exhaust system according to any one of claims 1 to 13, wherein the jetting causes a vortex stagnation of the precoat powder agent and air in the stagnation recess.   The exhaust system according to claim 14, wherein the precoat agent nozzle is disposed in a state in which the precoat powder agent and air collide obliquely with the inner surface of the retention recess. While providing an upstream drooping wall in a vertical posture at the upstream end edge of the retention recess in the air passage direction in the air introduction tube portion,
In the air passage direction in the air introduction tube portion, a downstream hanging wall having a vertical posture is provided at the downstream end edge of the retention recess,
While guiding the precoat powder agent and air that has reached the upstream drooping wall in the vortex-like residence of the precoat powder agent and air in the dwelling recess, downward by the upstream drooping wall,
The pre-coated powder agent and air that have reached the downstream-side dripping wall are guided downward by the downstream-side dripping wall when the pre-coating powder agent and air stay in the eddy current in the retention recess. Or the exhaust equipment of 15. An air introduction air passage formed inside the air introduction tube portion by disposing an outlet side opening of the air introduction tube portion at a position lower than the exhaust port which is an entrance side opening, and a bottom wall of the air passage And the lower sloped air passage and the sloped bottom wall that become lower toward the downstream side in the air passage direction, and the dry filter is disposed at a position higher than the outlet side opening of the air introduction cylinder part,
17. The structure according to claim 14, wherein the air that has passed through the first descending air introduction air passage of the air introduction tube portion is suddenly changed in an upward state toward the dry filter in the filter device. Exhaust equipment.   The exhaust chamber is a wind guide chamber that receives air discharged downward from a coating chamber disposed immediately above the exhaust chamber and paint mist contained therein and guides the air to the exhaust port. Exhaust equipment as described in   18. The exhaust system according to claim 1, wherein the exhaust chamber is a painting work chamber that discharges excess spray paint mist generated in a painting work performed in the room together with room air from the exhaust port.

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