JP6718614B2 - Painting system - Google Patents

Description

The present invention relates to a coating system for supplying a mixed air obtained by mixing clean air obtained by removing harmful substances from exhaust air and outside air to a coating booth.

A coating booth that allows the exhaust air to flow from the coating chamber to the exhaust chamber, with the upper part being the coating chamber and the lower part being the exhaust chamber, and a coating machine that is installed in the coating chamber and sprays the paint as paint particles toward the object to be coated, A paint separator installed in the exhaust chamber and having a filter for separating the paint particles carried from the paint chamber together with the exhaust air from the exhaust air, and the precoat material is ejected toward the exhaust air flowing into the paint separator. A pre-coating material ejecting device, the paint separating device is a hopper part for receiving the collected matter collected by the filter while the filter containing cover is opened and the lower side is opened, and the filter containing cover of the filter containing cover. An upper air cover for closing the upper opening, and an exhaust air inflow passage for guiding the exhaust air upward from the lower side toward the upper side of the filter is formed between the filter housing cover and the upper cover. Of the coating booth device in which the jet outlet of is located in the exhaust air inflow passage is disclosed (see Patent Document 1).

JP, 2016-36757, A

In the coating booth device disclosed in Patent Document 1, the precoat material ejected from the precoat material ejecting device and adsorbing the paint particles contained in the exhaust air is collected by the filter of the paint separating device, so that the precoat material is removed from the exhaust air. At the same time, the paint particles can be separated and clean air can be produced. When applying oil-based paint to the object to be coated, volatile organic compounds (hydrocarbons such as benzene, toluene, xylene, and organic chlorine-based compounds such as trichloroethylene, tetrachloroethylene, dichloroethane) contained in the oil-based paint are scattered and volatilized. Exhaust air containing a volatile organic compound is discharged from the coating booth, but in the coating booth device disclosed in Patent Document 1, the volatile organic compound passes through the filter of the coating separation device and collects the volatile organic compound in the filter. However, the exhaust air containing the volatile organic compound is released to the outside, and the atmosphere is polluted by the volatile organic compound. Further, the exhaust air containing the volatile organic compound may flow back to the coating booth again, and the worker working in the coating booth may inhale the volatile organic compound, which may impair the health of the worker.

An object of the present invention is to remove harmful substances from exhaust air containing harmful substances consisting of at least volatile organic compounds of a volatile organic compound and a coating mist, and to obtain clean air from which harmful substances are removed. It is to provide a coating system that can be produced. Another object of the present invention is to be able to supply clean air to the coating booth and to exhaust the clean air to the outside, thereby polluting the atmosphere and impairing the health of workers working in the coating booth. It is to provide a coating system that can perform the coating work in a good environment without any problems.

The premise of the present invention for solving the above-mentioned problems is a coating booth of a predetermined volume for coating a material to be coated, and exhaust air containing a harmful substance composed of at least a volatile organic compound of a volatile organic compound and a coating mist. A collection mechanism that collects the air from the coating booth, an air purification mechanism that collects harmful substances from the exhaust air collected by the collection mechanism to produce clean air, and a mixture of the clean air produced by the air purification mechanism and the outside air. And a supply mechanism for supplying the mixed air to the coating booth, and the supply mechanism discharges a part of the mixed air while supplying the remaining mixed air to the coating booth.

As a feature of the present invention on the above-mentioned premise, the air cleaning mechanism is a porous filter material made of synthetic fiber and having a predetermined thickness and a predetermined area, and is supplied to the filter material to keep the entire filter material in a wet state. Formed from an oily solution and a supply means for supplying the oily solution to the filter material, the coating system causes exhaust air to flow through the filter material in a wet state by the oily solution, and removes harmful substances contained in the exhaust air from the oily solution. To collect it.

As an example of the present invention, in the air cleaning mechanism, a plurality of filter materials form a multi-layer filter structure aligned in the air flow direction in a state in which the surfaces thereof are overlapped, and the supply means is an air filter of the multi-layer filter structure. An oily solution is supplied to the upper end of the rearmost filter material located rearward in the flow direction, and the oily solution infiltrates from the rearmost filter material toward the filter material located forward in the air flow direction, while While flowing from the upper end of the filter material toward the lower end, it flows downward from the lower end of the filter material.

As another example of the present invention, the air cleaning mechanism includes a honeycomb laminated filter having a predetermined thickness and a predetermined area, which is installed on the downstream side of the multilayer filter structure, and the supply means has an oil-based property on the upper end portion of the honeycomb laminated filter. A solution is supplied to keep the entire honeycomb laminated filter in a wet state, and the oil solution flows from the upper end to the lower end of the honeycomb laminated filter, and flows out downward from the lower end of the honeycomb laminated filter, so that the coating system However, the exhaust air is caused to flow through the honeycomb laminated filter which is in a wet state with the oil solution, and the harmful substances contained in the exhaust air are collected in the oil solution.

As another example of the present invention, the supply means is located below the multilayer filter structure and the honeycomb laminated filter, and a storage tank for storing the oily solution flowing downward from the multilayer filter structure and the honeycomb laminated filter, and , A circulation pump that supplies the oily solution stored in the storage tank to the upper end of the filter material and the upper end of the honeycomb laminated filter, and a strainer that filters harmful substances trapped in the oily solution, and the oily solution While the oil solution is circulated, the oil solution is caused to flow from the upper end to the lower end of the filter material, and the oil solution is caused to flow from the upper end to the lower end of the honeycomb laminated filter.

As another example of the present invention, the air cleaning mechanism includes a supply amount adjusting means for adjusting the supply amount of the oily solution to be supplied to the multilayer filter structure and the honeycomb laminated filter, and the supply amount adjusting means is a coating booth. When the supply amount of the mixed air to be supplied is large, the supply amount of the oil solution supplied to the multilayer filter structure and the honeycomb laminated filter is increased, and when the supply amount of the mixed air to be supplied to the coating booth is small, The supply amount of the oil solution supplied to the multilayer filter structure and the honeycomb laminated filter is reduced.

As another example of the present invention, the air supply mechanism includes a deodorizing device that removes an odor contained in the mixed air.

As another example of the present invention, the air supply mechanism includes an air conditioner that adjusts at least one of the temperature and the humidity of the mixed air.

As another example of the present invention, the air supply mechanism includes an air supply fan forcibly supplying the mixed air, an inflow amount adjusting means for adjusting the inflow amount of the outside air, and an exhaust amount of the mixed air to the outside. It includes an exhaust amount adjusting means for adjusting and an air supplying amount adjusting means for adjusting an air supplying amount of the mixed air to the coating booth, and a predetermined ratio of the mixed air is externally supplied by the exhaust amount adjusting means and the air supplying amount adjusting means. While exhausting, a larger proportion of the air mixture than the air that is exhausted to the outside is supplied from the ceiling of the painting booth, and the collection mechanism causes the exhaust air to flow into the floor below the painting booth and the exhaust air from the floor to the air cleaning mechanism. Inflow to.

As another example of the present invention, the air supply mechanism maintains the room pressure of the coating booth at a positive pressure by the exhaust gas amount adjusting means and the air supply amount adjusting means.

As another example of the present invention, the air supply mechanism is installed at the intake of the outside air to collect dust contained in the outside air, and dust contained in the mixed air installed in the ceiling of the coating booth. And an air filter for collecting.

In another example of the present invention, the oily solution is liquid petrolatum.

According to the coating system of the present invention, the exhaust air is caused to flow through the filter material in a wet state by the oil solution supplied to the filter material, and at least the volatile organic compounds contained in the exhaust air and the coating mist are volatile. By collecting harmful substances consisting of organic compounds in an oily solution, it is possible to remove the volatile organic compounds generated when applying oil-based paint to the object to be coated and the harmful substances of the coating mist from the exhaust air. It is possible to generate clean air by removing volatile organic compounds and coating mist from the air. The coating system can supply clean air from which harmful substances have been removed from the exhaust air to the coating booth, so that workers working in the coating booth do not breathe in volatile organic compounds and coating mist, thus ensuring the health of the worker. It is possible to perform the painting work in a good environment that does not harm the environment.

A plurality of filter materials form a multilayer filter structure arranged in the air flow direction in a state where the surfaces thereof are overlapped with each other, and the supply means is the rearmost filter material of which the supply means is located rearward in the air flow direction. The oily solution is supplied to the upper end of the filter material, and the oily solution flows from the uppermost end of the filter material toward the lower end while infiltrating from the rearmost filter material toward the filter material located forward in the air flow direction. At the same time, the coating system that flows downward from the lower ends of the filter materials supplies the oily solution from the upper end of the multilayer filter structure formed of a plurality of filter materials, and the oily solution flows downward from the lower ends of the filter materials. Since the oily solution does not stay in those filter materials, the oily solution that collects the harmful substances can be replaced with a new one, and the oily solution will not be saturated with the harmful substances. The harmful substances can be reliably collected, and the volatile organic compounds and the harmful substances of the coating mist can be surely removed from the exhaust air. The flow rate of exhaust air in the multilayer filter structure gradually decreases due to the air resistance of the filter material, and the flow rate of exhaust air in the filter material located in the front in the air flow direction is fast and located in the rear in the air flow direction. Although the flow rate of exhaust air through the filter material becomes slower, the coating system supplies the oil solution to the upper end of the last filter material located behind the air flow direction in the multilayer filter structure, and the oil solution By infiltrating from the rearmost filter material toward the filter material located forward in the air flow direction, the flow velocity of the oily solution in the filter material located forward in the air flow direction becomes slower, and Even if the exhaust air quickly flows through the filter material located at, the contact time of the exhaust air with the molecules of the oily solution can be lengthened and the harmful substances contained in the exhaust air can be collected in the oily solution. By using the multilayer filter structure, it is possible to reliably remove harmful substances contained in the exhaust air.

The air cleaning mechanism is installed on the downstream side of the multilayer filter structure and includes a honeycomb laminated filter having a predetermined thickness and a predetermined area, and the supply means supplies the oil solution to the upper end of the honeycomb laminated filter to wet the entire honeycomb laminated filter. Hold the state, the oil solution flows from the upper end to the lower end of the honeycomb laminated filter, and flows out from the lower end of the honeycomb laminated filter downward, exhaust air to the honeycomb laminated filter in a wet state by the oil solution. A coating system that collects harmful substances contained in the exhaust air from the oily solution by collecting the harmful substances contained in the exhaust air into the oily solution is a multi-layer filter structure in which volatile organic compounds and harmful substances in the coating mist are collected. Even if it passes, harmful substances can be trapped in the oil solution flowing through the entire area of the honeycomb laminated filter installed on the downstream side of the multilayer filter structure. Substances can be removed, and clean air can be produced by removing volatile organic compounds and coating mist from exhaust air.

The supply means is located below the multilayer filter structure and the honeycomb laminated filter, the storage tank for storing the oily solution flowing out downward from the multilayer filter structure and the honeycomb laminated filter, and the oily solution stored in the storage tank. A circulation pump that supplies the upper end of the filter material and the upper end of the honeycomb laminated filter, and a strainer that filters harmful substances trapped in the oily solution, while circulating the oily solution, filter the oily solution A coating system that causes the oil solution to flow from the upper end to the lower end of the honeycomb laminated filter while flowing from the upper end to the lower end of the material, the harmful substances collected in the oily solution are filtered by a strainer, Since the oily solution is not saturated with harmful substances, and the oily solution from which harmful substances have been filtered is supplied to these filter materials and honeycomb laminated filters by a circulation pump, a new oily solution from which harmful substances have been filtered is used. Therefore, it is possible to reliably collect harmful substances, and to reliably remove volatile organic compounds and harmful substances of coating mist from exhaust air.

The air cleaning mechanism includes a supply amount adjusting means for adjusting the supply amount of the oily solution to be supplied to the multilayer filter structure and the honeycomb laminated filter, and the supply amount adjusting means controls the supply amount of the mixed air to be supplied to the coating booth. If there are many, increase the supply amount of the oily solution to be supplied to the multilayer filter structure and the honeycomb laminated filter, and if the supply amount of the mixed air to be supplied to the coating booth is small, in the multilayer filter structure and the honeycomb laminated filter. The coating system that reduces the supply amount of the oily solution to be supplied increases the supply amount of the oily solution to the multilayer filter structure and the honeycomb laminated filter when the supply amount of the mixed air to be supplied to the coating booth is large. By supplying a new oily solution from which harmful substances have been filtered to these filters, while preventing the saturation of harmful substances in the oily solution, the volatile organic compounds contained in the mixed air and the harmful substances of the coating mist can be added to the oily solution. It can be reliably collected, and harmful substances can be reliably removed from the exhaust air. In the coating system, when the supply amount of the mixed air to be supplied to the coating booth is small, the supply amount of the oil solution supplied to the multilayer filter structure and the honeycomb laminated filter is reduced, thereby wasting the supply of the oil solution. It is possible to reduce the power consumption of the circulation pump and save energy in the system.

In the coating system that includes the deodorizing device whose air supply mechanism removes the odor contained in the mixed air, the deodorizing device removes the odor contained in the mixed air, and the mixed air from which the odor has been removed is supplied to the coating booth. Since the unpleasant odor associated with painting does not fill the painting booth, painting work can be performed in a comfortable environment.

A coating system including an air conditioner in which an air supply mechanism adjusts at least one of temperature and humidity of mixed air is adjusted by adjusting the temperature inside the coating booth by the air conditioner, thereby providing a favorable temperature environment in the coating booth. You can make a painting work in a comfortable environment. In the coating system, for example, when the water-based paint is applied to the object to be coated in the coating booth, if the humidity inside the coating booth is high, the drying of the water-based paint is delayed, but the air conditioner should reduce the humidity inside the coating booth. Thus, it is possible to speed up the drying of the water-based paint and improve the efficiency of the painting work. When the humidity inside the coating booth is lower than necessary, the coating system will dry the water-based paint early and reduce the leveling of the coating surface.However, by increasing the humidity inside the coating booth using an air conditioner, It is possible to prevent early drying of the coating, prevent the leveling of the coated surface from lowering, and prevent an increase in coating defects. If the water-based paint is applied, the oil-based paint may be applied again.However, volatile organic compounds generated from the oil-based paint and harmful substances of the coating mist can be collected in the oil-based solution, and the exhaust air Can remove harmful substances from.

The air supply mechanism includes an air supply fan forcibly supplying the mixed air, an inflow amount adjusting means for adjusting the inflow amount of the outside air, an exhaust amount adjusting means for adjusting the exhaust amount of the mixed air to the outside, and a mixing unit. A mixing unit that includes an air supply amount adjusting unit that adjusts an air supply amount of air to the coating booth, and discharges a predetermined proportion of the mixed air to the outside by the exhaust amount adjusting unit and the air supply amount adjusting unit while exhausting the mixed air to the outside. A coating system that supplies a larger proportion of mixed air than the air from the ceiling of the coating booth, a collection mechanism causes exhaust air to flow under the floor of the coating booth, and exhaust air to flow into the air cleaning mechanism from below the floor. By exhausting the mixed air of the outside to the outside, it is possible to take in the outside fresh air into the painting booth, the concentration of carbon dioxide does not increase in the painting booth, and it does not harm the health of workers. It is possible to perform painting work in various environments.

The coating system in which the air supply mechanism keeps the room pressure of the coating booth at a positive pressure by means of the exhaust air amount adjusting unit and the air supply amount adjusting unit is a recovery mechanism that collects exhaust air containing harmful substances when the room pressure of the coating booth becomes negative. Cannot flow back into the coating booth from the paint booth to generate clean air, but by keeping the room pressure in the paint booth at a positive pressure, exhaust air is reliably recovered by the recovery mechanism, and the exhaust air is transferred to the air cleaning mechanism. Clean air free of harmful substances can be supplied to the paint booth.

Painting including an air filter installed in the intake of the outside air to collect dust contained in the outside air, and an air filter installed in the ceiling of the coating booth to collect dust contained in the mixed air The system uses these air filters to remove dust contained in the outside air and mixed air, so that the dust-removed mixed air can be supplied to the coating booth, and the dust-removed mixed air can be supplied. You can do the painting work in a comfortable environment.

The coating system, in which the oily solution is liquid petrolatum, collects the volatile organic compounds contained in the exhaust air and the harmful substances consisting of at least the volatile organic compounds contained in the coating mist in the liquid petrolatum, so as to collect the volatile organic compounds and the coating mist. Mist can be collected in liquid petrolatum, and volatile organic compounds and harmful substances of the coating mist generated when applying oil paint to the object to be coated can be removed from the exhaust air and volatilized from the exhaust air. It is possible to generate clean air from which organic compounds and coating mist are removed.

The side view of the coating system shown as an example. A perspective view of a honeycomb laminated filter shown as an example Top view of the painting system. Front view of the coating system. Rear view of the painting system. The side view of the coating system which shows the inside of a coating booth. FIG. 3 is a sectional view taken along the line AA of FIG. 2. The side view of the air purifying mechanism and air supply mechanism shown as an example. The perspective view of the multilayer filter structure shown as an example. The perspective view of the multilayer filter structure shown as another example. The perspective view of the honeycomb laminated filter shown as an example. The side view of the coating system which shows the inside of the coating booth in an operating state. The perspective view of the multilayer filter structure which shows the flow of an oil solution. The perspective view of another example of the multilayer filter structure showing the flow of the oily solution. The perspective view of the honeycomb laminated filter which shows the flow of an oil solution.

The details of the coating system according to the present invention will be described below with reference to the accompanying drawings such as FIG. 1 which is a side view of the coating system 10 shown as an example. 2 is a top view of the coating system 10, and FIG. 3 is a front view of the coating system 10. FIG. 4 is a rear view of the coating system 10, and FIG. 5 is a side view of the coating system 10 showing the inside of the coating booth 11. 6 is a cross-sectional view taken along the line AA of FIG. 2, and FIG. 7 is a side view of the air cleaning mechanism 13 and the air supply mechanism 14 shown as an example. FIG. 8 is a perspective view of the multilayer filter structure 31 shown as an example, and FIG. 9 is a perspective view of the multilayer filter structure 31 shown as another example. FIG. 10 is a perspective view of the honeycomb laminated filter 32 shown as an example. In FIG. 1, the air purifying mechanism 13, the sensors 25, 26, 27, and the air filters 58, 61 are indicated by solid lines.

The coating system 10 is used when applying paint to an object to be coated. Although the automobile 66 is illustrated as the object to be coated in FIG. 5, the object to be coated is not limited to the vehicle 66, and the coating system 10 can be used for coating any object to be coated. The coating system 10 includes a coating booth 11 having a predetermined volume for coating a vehicle 66 (object to be coated), a recovery mechanism 12 for recovering the exhaust air a1 from the coating booth 11, and a harmful substance collected from the exhaust air a1. An air purifying mechanism 13 for generating clean air a2 and a supply mechanism 14 for supplying mixed air a4, which is a mixture of the clean air a2 generated by the air cleaning mechanism 13 and the outside air a3, to the coating booth 11. There is.

The coating booth 11 is a panel booth in which a plurality of panels 15 are connected, and a vertical pumping type is adopted. The semi-down method can also be adopted. In the coating booth 11, the side walls 16, the ceiling 17, the floor 18, and the rear wall 19 are formed by the respective panels 15. The coating booth 11 is provided with a door 20 on the side wall 16 thereof and a doorway 21 of the automobile 66 on the front side. A controller 22 (control device) is attached to the side wall 16 of the coating booth 11. A lighting fixture 23 is installed on the ceiling 17 of the coating booth 11. A housing 24 extending in the vertical direction is installed on the rear wall 19 of the coating booth 11.

Although not shown, the coating booth 11 is equipped with various coating equipment (spray gun, electrostatic coating machine, air brush, coating stirrer, compressor, etc.). In the coating booth 11, the door 21 is opened to convey the automobile 66 to the inside of the booth 11, and then the door 21 is closed to perform painting work on the painting surface of the automobile 66 by the painting equipment.

A room pressure sensor 25, a temperature sensor 26, and a humidity sensor 27 are installed inside the coating booth 11. The room pressure sensor 25, the temperature sensor 26, and the humidity sensor 27 are connected to the controller 22. The room pressure sensor 25 measures the room pressure inside the coating booth 11 and sends the measured measurement room pressure to the controller 22. The temperature sensor 26 measures the temperature inside the coating booth 11 and sends the measured temperature to the controller 22. The humidity sensor 27 measures the humidity inside the coating booth 11 and sends the measured measured humidity to the controller 22. A concentration sensor that measures the concentration of carbon monoxide and a flammable gas leak detector that detects a leak of flammable gas may be installed.

The controller 22 (control device) contains a microcomputer having a central processing unit and a memory, and a storage device. An input/output device such as a ten-key unit (not shown), a display (not shown), a touch panel (not shown), etc. is connected to the controller 22. In the storage device of the controller 22, the set room pressure of the coating booth 11, the set temperature of the coating booth 11, the set humidity of the coating booth 11, the set output of the air supply fan 54 (the flow rate of the mixed air a4 flowing into the coating booth 11). The air supply ratio of the mixed air a4 (the ratio of the mixed air a4 flowing into the coating booth 11) and the exhaust ratio of the mixed air a4 (the ratio of the mixed air a4 exhausted to the outside) are stored (stored). The set room pressure, the set temperature, the set humidity, the set output (flow rate of the mixed air a4), the air supply rate, and the exhaust rate can be freely changed by the ten-key unit.

In the storage device of the controller 22, the output of the air supply fan 54 (the flow rate of the mixed air a4 flowing into the coating booth 11) and the output of the circulation pump 46 are the oil solution 33 supplied to the multilayer filter structure 31 (filter material 30). (Supply amount of) is stored (stored). In the storage device of the controller 22, the opening of the swirl blade of the motor damper 62 corresponding to the supply rate of the mixed air a4 (the rate of the mixed air a4 flowing into the coating booth 11) and the exhaust rate of the mixed air a4 (to the outside) The opening degree of the turning blades of the motor damper 63 and the motor damper 64 corresponding to the ratio of the mixed air a4 to be exhausted) is stored (stored).

The recovery mechanism 12 includes a plurality of air recovery ports (not shown) installed on the floor 18 of the coating booth 11, and a recovery duct installed under the floor 28 of the coating booth 11 and extending between the entrance 21 and the rear wall 19. And 29. The exhaust air a4 that has passed through the air recovery port flows into the recovery duct 29. The recovery duct 29 is connected to the lower portion of the housing 24 and communicates with the housing 24, and allows the exhaust air a4 to flow from the housing 24 into the air cleaning mechanism 13.

When the oil paint is applied to the automobile 66 (object to be coated) in the coating booth 11, volatile organic compounds (hydrocarbons such as benzene, toluene, xylene, etc., trichlorethylene, tetrachloroethylene, dichloroethane, etc.) contained in the oil paint are used. Compound) is scattered, and the coating mist of the oil-based paint is scattered, and they are dispersed in the air. The exhaust air a4 collected from the coating booth 11 contains toxic substances such as volatile organic compounds and coating mist.

The air cleaning mechanism 13 is installed below the housing 24. The air cleaning mechanism 13 includes a multilayer filter structure 31 made of a plurality of porous (porous) filter materials 30, a honeycomb laminated filter 32, an oil solution 33, a multilayer filter structure 31 and a honeycomb laminated filter 32. And a supply means 34 for supplying the oily solution 33 to. The filter material 30 is a non-woven fabric or felt made of synthetic fiber and has a predetermined thickness and a predetermined area. The filter materials 30 are lined up in the air flow direction (thickness direction) with their surfaces superposed. The filter materials 30 overlap each other in the air flow direction to form a multilayer filter structure 31. The filter material 30 has an upper end portion 35 and a lower end portion 37, a central portion 36, and both side portions 38.

In the multilayer filter structure 31 shown in FIG. 8, four filter materials 30 having substantially flat surfaces are overlapped in the air flow direction (thickness direction). In the multilayer filter structure shown in FIG. 9, four filter materials 30 that repeatedly undulate in a wave shape are overlapped in the air flow direction (thickness direction). The number of filter materials 30 that overlap in the air flow direction (thickness direction) is not particularly limited, and three or less filter materials 30 may form the multilayer filter structure 31 and five or more filter materials 30. 30 may form a multilayer filter structure 31.

The honeycomb laminated filter 32 combines a sheet-shaped material and a corrugated material made of at least one of ceramic fiber paper, glass fiber paper, flame-retardant paper, activated carbon paper, non-woven fabric, and felt, and combines them. The filters 32 are stacked and have a predetermined thickness and a predetermined area. The honeycomb laminated filter 32 is installed on the downstream side (rearward in the air flow direction) of the multilayer filter structure 31 and is separated from the multilayer filter structure 31 by a predetermined distance in the rearward direction in the air flow direction. The honeycomb laminated filter 32 has an upper end portion 39 and a lower end portion 41, a central portion 40 and both side portions 42.

The oil solution 33 takes in harmful substances (volatile organic compounds, coating mist) contained in the exhaust air a4 while keeping the entire area of the multilayer filter structure 31 (the entire area of the filter material 30) and the entire area of the honeycomb laminated filter 32 in a wet state. .. Liquid petrolatum is used for the oil solution 33. The oily solution 33 flows from the upper end portion 35 of the multilayer filter structure 31 (filter material 30) to the lower end portion 37 through the central portion 36, and also passes from the upper end portion 39 of the honeycomb laminated filter 32 to the central portion 40. Flows toward the lower end portion 41.

The supply means 34 includes a storage tank 43 (drain pan), a replenishment/replacement tank 44, a supply tank 45 (fuel supply header), a circulation pump 46, and a strainer 47, and includes a supply amount adjusting means. The housing tank 43 is housed in the housing 24, is located below (immediately below) the multilayer filter structure 31 and the honeycomb laminated filter 32, and flows downward from the lower end portions 37 and 41 of the multilayer filter structure 31 and the honeycomb laminated filter 32. The oil solution 33 (liquid petrolatum) thus prepared is contained. The replenishment/replacement tank 44 is installed outside the housing 24 and is used for replenishment of the oily solution 33 and replacement of the soiled oily solution 33. The storage tank 43 and the replenishment/replacement tank 44 are connected by a pipe line 48 (metal pipe).

The supply tank 45 is housed in the housing 24 and located at the upper end 35 of the multilayer filter structure 31 and the upper end 39 of the honeycomb laminated filter 32. The supply tank 45 has a first supply port 49 that opens between the both side portions 38 of the multilayer filter structure 31 and that opens to the entire upper end portion 35 and an entire upper end portion 39 that extends between the both side portions 42 of the honeycomb laminated filter 32. The second supply port 50 is provided. The supply tank 45 supplies the oil solution 33 (liquid petrolatum) from the first supply port 49 to the entire upper end portion 39 of the multilayer filter structure 31, and supplies the oil solution from the second supply port 50 to the entire upper end portion 39 of the honeycomb laminated filter 32. Solution 33 (liquid petrolatum) is supplied.

The supply/replacement tank 44 and the supply tank 45 are connected by a pipe line 51. The circulation pump 46 is installed in a pipe line 48 extending between the storage tank 43 and the replenishment/exchange tank 44, forcibly supplies the oily solution 33, and circulates the oily solution 33. The control unit of the circulation pump 47 is connected to the controller 22. The strainer 47 is installed in the pipe line 51 extending between the replenishment/replacement tank 44 and the supply tank 45, and filters the harmful substances collected in the oily solution 33.

The supply amount adjusting means adjusts the output of the circulation pump 48 to adjust the supply amount of the oily solution 33 supplied to the multilayer filter structure 31 and the honeycomb laminated filter 32. In the supply amount adjusting means, when the supply amount of the mixed air a4 to be supplied to the coating booth 11 is large, the supply amount of the oil solution 33 supplied to the multilayer filter structure 31 and the honeycomb laminated filter 32 is increased to increase the coating booth. When the supply amount of the mixed air a4 supplied to 11 is small, the supply amount of the oil solution 33 supplied to the multilayer filter structure 31 and the honeycomb laminated filter 32 is reduced.

The air supply mechanism 14 is formed of an air supply duct 52, an outside air intake duct 53, an air supply fan 54, a deodorizing device 55, an air conditioner 56, first and second air filter units 57 and 58 (air filters), and an inflow. An amount adjusting means, an exhaust amount adjusting means, and an air supply amount adjusting means are provided. The air supply duct 52 is composed of a first air supply duct 52a extending in the vertical direction and a second air supply duct 52b extending in the front-rear direction. The first air supply duct 52a is connected to the upper portion of the housing 24 and communicates with the housing 24. At the upper part of the first air supply duct 52a, a discharge port 59 (gallery) for discharging the mixed air a4 to the outside is opened, and at the same time, an air supply port 60 for supplying the mixed air a4 to the second air supply duct 52b is provided. It is open.

The second air supply duct 52b is connected to the air supply port 60 of the first air supply duct 52a, is located on the ceiling 17 of the coating booth 11, and extends between the rear wall 19 of the coating booth 11 and the doorway 21. .. The second air supply duct 52b is inclined downward from the rear wall 19 toward the entrance 21. The outside air intake duct 53 is connected to the lower portion of the housing 24 and extends rearward from the housing 24. The outside air intake duct 53 takes in outside air a3 and supplies the outside air a3 to the lower portion of the housing 24.

The air supply fan 54 is housed in the center of the housing 24, is located above the multilayer filter structure 31 and the honeycomb laminated filter 32, and forcibly supplies the coating booth 11 with the mixed air a4 (clean air a2). .. The control unit of the air supply fan 54 is connected to the controller 22. The deodorizing device 55 is detachably or replaceably housed in the central portion of the housing 24 and removes odor contained in the mixed air a4 flowing in the housing 24.

As the deodorizing device 55, a wet deodorizing device, an activated carbon deodorizing filter, or a constant temperature oxidation type deodorizing device can be used. In the constant temperature oxidation type deodorizer, a heater heats the odor to about a degree and a catalyst filter decomposes the odor. The wet deodorizing device and the constant temperature oxidation type deodorizing device are connected to the controller 22. In the coating system 10, the deodorizing device 55 may not be installed. In this case, the mixed air a4 is not deodorized.

The air conditioner 56 is installed in the second air supply duct 52b immediately before the first air supply duct 52a. The control unit of the air conditioner 56 is connected to the controller 22. The air conditioner 56 adjusts the temperature of the mixed air a4 supplied to the coating booth 11, and adjusts the humidity of the mixed air a4 supplied to the coating booth 11. The air conditioner 56 may not be installed in the coating system 10. In this case, the temperature and humidity of the mixed air a4 are not adjusted.

The first air filter unit 57 (air filter) is installed at the intake 61 of the outside air a3 of the outside air intake duct 53 and collects the dust contained in the outside air a3. The second air filter unit 58 (air filter) is installed on the ceiling 17 of the coating booth 11 and collects dust contained in the mixed air a4. The second air filter unit 58 extends between the doorway 21 of the coating booth 11 and the rear wall 19 and hangs from the ceiling 17 toward the floor 18 so as to form an arc. For the first and second air filter units 57 and 58, any one of a coarse dust filter, a medium/high performance filter, a HEPA filter, or a composite filter in which these filters are combined can be used.

Motor dampers 62 to 64 (MD) are used for the inflow amount adjusting means, the exhaust amount adjusting means, and the air supply amount adjusting means. The control units of the motor dampers 62 to 64 are connected to the controller 22. The motor damper 62 forming the inflow amount adjusting means is installed inside the outside air intake duct 53 and in the outside air intake port 65 of the housing 24, and adjusts the amount of air flowing through the air flow path by the swirl vanes, so that the housing The inflow amount of the outside air a3 to be introduced into 24 is adjusted. The motor damper 63 forming the exhaust amount adjusting means is installed inside the first air supply duct 52a and at the discharge port 59 of the air supply duct 52a, and adjusts the amount of air flowing through the air flow path by the swirl vanes. Thus, the exhaust amount of the mixed air a4 discharged to the outside is adjusted.

The motor damper 64 forming the air supply amount adjusting means is installed inside the first air supply duct 52a and at the air supply port 60 of the air supply duct 52a, and adjusts the amount of air flowing through the air flow path by the swirl vanes. By doing so, the supply amount (inflow amount) of the mixed air a4 supplied to the second supply duct 52b is adjusted. In the air supply duct 14, a part of the mixed air a4 is exhausted to the outside by the motor damper 63 (exhaust amount adjusting means), while the remaining mixed air a4 is supplied to the coating booth 11 by the motor damper 64 (supply amount adjusting means). Supply air.

The controller 22 includes a room pressure sensor 25, a temperature sensor 26, a humidity sensor 27, a circulation pump 46, an air supply fan 54, a deodorizing device 55 (wet deodorizing device, constant temperature oxidation deodorizing device), an air conditioner 56, a motor damper 62 to. Turn ON/OFF 64. The controller 22 compares the measured room pressure of the coating booth 11 transmitted from the room pressure sensor 25 with the set room pressure of the coating booth 11, and performs feedback control so that the measured room pressure falls within the set room pressure range. ..

The controller 22 causes the control units of the motor damper 62 (inflow amount adjusting means), the motor damper 63 (exhaust amount adjusting means), and the motor damper 64 (air supply amount adjusting means) to control the opening signal of the rotating blade (opening holding signal or By transmitting the opening degree change signal) and adjusting the opening degrees of the motor dampers 62 to 64, the room pressure of the coating booth 11 is maintained at the set room pressure. The controller 22 maintains the room pressure of the coating booth 11 at a positive pressure by the motor damper 63 (exhaust amount adjusting means) and the motor damper 64 (supply amount adjusting means).

The controller 22 compares the measured temperature of the coating booth 11 transmitted from the temperature sensor 26 with the preset temperature of the coating booth 11, and performs feedback control so that the measured temperature falls within the set temperature range. The controller 22 sends a temperature signal (a temperature holding signal or a temperature change signal) to the control unit of the air conditioner 56, and adjusts the temperature of the mixed air a4 supplied from the air conditioner 56, so that the coating booth 11 Holds the temperature at the set temperature.

The controller 22 compares the measured humidity of the coating booth 11 transmitted from the humidity sensor 27 with the preset humidity of the coating booth 11, and performs feedback control so that the measured humidity falls within the set humidity range. The controller 22 sends a humidity signal (humidity retention signal or humidity change signal) to the control unit of the air conditioner 56, and adjusts the humidity of the mixed air a4 supplied from the air conditioner 56, whereby the coating booth 11 The humidity of is maintained at the set temperature and humidity.

The controller 22 outputs the output of the air supply fan 54 stored in the storage device (the flow rate of the mixed air a4 flowing into the coating booth 11) and the output of the circulation pump 46 (the supply amount of the oil solution 33 supplied to the filters 31 and 32). ), the output of the circulation pump 46 is controlled according to the set output of the air supply fan 54. The controller 22 transmits the output signal (the output maintaining signal or the output changing signal) of the circulation pump 46 confirmed by the correlation to the control unit of the circulation pump 46, and outputs the output of the circulation pump 46 according to the set output of the air supply fan 54. Adjust.

11 is a side view of the coating system 10 showing the inside of the coating booth 11 in the operating state, and FIG. 12 is a perspective view of the multilayer filter structure 31 showing the flow of the oil solution 33. FIG. 13 is a perspective view of another example of the multilayer filter structure 31 showing the flow of the oil solution 33, and FIG. 14 is a perspective view of the honeycomb laminated filter 32 showing the flow of the oil solution 33. In FIG. 11, the flows of the exhaust air a1, the clean air a2, the outside air a3, and the mixed air a4 are indicated by arrows L1 to L4, and the flows of the oily solution 33 are indicated by arrows L5 and L6.

When performing the painting work in the painting booth 11, the operator turns on the switch of the controller 22. When the switch of the controller 22 is turned on, a menu screen (not shown) is displayed on the display connected to the controller 22. A condition display area, a condition input button, a system operation button, and an OFF button are displayed on the menu screen. When the OFF button is clicked (tapped), the system 10 stops.

In the condition display area, a set room pressure display area that displays the set room pressure of the coating booth 11, a set humidity display area that displays the set humidity of the coating booth 11, a set temperature display area that displays the set temperature of the coating booth 11, A set output display area that displays the set output of the air supply fan 54, an air supply rate display area that displays the air supply rate of the mixed air a4, and an exhaust rate display area that displays the exhaust rate of the mixed air a4 are displayed.

To enter or change conditions, click the condition input button on the menu screen. When the condition input button is clicked, a condition input screen (not shown) is displayed on the display. On the condition input screen, a room pressure input area, a humidity input area, a temperature input area, an output input area, an air supply rate input area, an exhaust rate input area, a setting button, a clear button, and a cancel button are displayed. Clicking the clear button clears the conditions entered in each input area and re-enters the conditions in each input area. When a condition is input to one of the air supply rate input area and the exhaust rate input area, the other condition is automatically determined. Click the Cancel button to return to the menu screen. When the setting button is clicked after inputting the condition in each input area, the controller 22 stores the condition input in each input area in the storage device and then displays the menu screen on the display.

After entering or changing each condition, click the system operation button on the menu screen. When the system operation button is clicked, the controller 22 transmits an ON signal to the control unit of the air supply fan 54 and at the same time transmits a setting output signal of the air supply fan 54 to the control unit. The control unit of the air supply fan 54 operates the air supply fan 54 at the set output while activating the air supply fan 54. The controller 22 transmits an ON signal to the control unit of the air conditioner 56, and also transmits a set temperature signal and a set humidity signal of the air conditioner 56 to the control unit. The control unit of the air conditioner 56 operates the air conditioner 56 at the set temperature and the set humidity while activating the air conditioner 56.

The controller 22 determines (indexes) the output of the circulation pump 46 with respect to the output (set output) of the air supply fan 54, taking into account the correlation between the output of the air supply fan 54 and the output of the circulation pump 46, and the circulation pump While transmitting the ON signal to the control unit of 46, the output signal of the circulation pump 46 is transmitted to the control unit. The control unit of the circulation pump 46 operates the circulation pump 46 with the output transmitted from the controller 22 while activating the circulation pump 46.

The controller 22 sends an ON signal to the deodorizing device 55 (wet deodorizing device, constant temperature oxidation type deodorizing device). The deodorizing device 55 is activated by receiving the ON signal from the controller 22. The controller 22 sends an ON signal to the room pressure sensor 25, the temperature sensor 26, and the humidity sensor 27. Upon receiving the ON signal from the controller 22, the room pressure sensor 25 starts measuring the room pressure of the coating booth 11 and transmits the measured measurement room pressure to the controller 22. Upon receiving the ON signal from the controller 22, the temperature sensor 26 starts measuring the temperature of the coating booth 11 and sends the measured temperature to the controller 22. The humidity sensor 27 having received the ON signal from the controller 22 starts measuring the humidity of the coating booth 11 and transmits the measured measured humidity to the controller 22.

The controller 22 determines the opening degree of the rotating blades of the motor damper 62 and the motor damper 63 corresponding to the exhaust rate of the mixed air a4, and sends an opening degree signal to the control units of the motor dampers 62 and 63. The control units of the motor damper 62 and the motor damper 63 adjust the opening of the turning blades of the motor dampers 62 and 63 to that of the opening signal according to the opening signal. The controller 22 determines the opening degree of the rotating blade of the motor damper 64 corresponding to the supply rate of the mixed air a4, and sends an opening degree signal to the control unit of the motor damper 64. The control unit of the motor damper 64 adjusts the opening of the turning blade of the motor damper 64 to that of the opening signal according to the opening signal.

The air supply fan 54 forcibly supplies the mixed air a4 from the ceiling 17 to the coating booth 11. The worker uses the coating facility in the coating booth 11 to perform the coating work of applying the oil-based paint or the water-based paint to the painted surface of the automobile 66. During the coating operation in the coating booth 11, the volatile organic compounds (VOC) contained in the oil paint are scattered, and the coating mist of the oil paint or the water-based paint is scattered, and these harmful substances are mixed in the mixed air a4. It The exhaust air a1 containing the harmful substances (mixed air a4) flows into the recovery duct 29 below the floor 28 through the air recovery port provided in the floor 18 as shown by an arrow L1 in FIG. Through to the bottom of the housing 24.

When the circulation pump 46 is started, the oil solution 33 is forcibly circulated by the circulation pump 46 (supply means 34), and the oil solution 33 is supplied from the first supply port 49 of the supply tank 45 to the multilayer filter structure 31 and supplied. The oil solution 33 is supplied to the honeycomb laminated filter 32 from the second supply port 50 of the tank 45.

The oily solution 33 is supplied to the entire upper end portion 35 extending between the both side portions 38 of the rearmost filter material 30 located rearward in the air flow direction (rearward in the thickness direction) of the multilayer filter structure 31. The oil solution 33 infiltrates from the entire upper end portion 35 of the rearmost filter material 30 toward the filter material 30 located forward (in the thickness direction) in the air flow direction, as shown by an arrow L5 in FIGS. In addition, the multilayer filter structure 31 (the filter material 30) flows from the upper end portion 35 to the central portion 36 and flows from the central portion 36 toward the lower end portion 37. The entire area of the multilayer filter structure 31 (the entire area of the filter material 30) is kept wet by the oil solution 33. The oily solution 33 that has flowed through the multilayer filter structure 31 (these filter materials 30) flows out (falls) downward from the lower end portion 37 of the multilayer filter structure 31, and is stored in the storage tank 43.

Further, the oily solution 33 is supplied to the entire upper end portion 39 extending between the both side portions 42 of the honeycomb laminated filter 32. As shown by an arrow L6 in FIG. 14, the oil solution 33 flows from the entire upper end portion 39 of the honeycomb laminated filter 32 to the central portion 40, and from the central portion 40 toward the lower end portion 41. The whole area of the honeycomb laminated filter 32 is kept wet by the oily solution 33. The oil solution 33 that has flowed through the honeycomb laminated filter 32 flows out (falls) downward from the lower end portion 41 of the honeycomb laminated filter 32 and is accommodated in the accommodation tank 43.

The exhaust air a1 flowing into the lower portion of the housing 24 through the recovery duct 29 flows through the multilayer filter structure 31 (filter material 30) in a wet state with the oil solution 33. When the exhaust air a1 flows through the multilayer filter structure 31 (filter material 30), the volatile organic compounds among the harmful substances contained in the exhaust air a1 dissolve in the oil solution 33, and the coating among the harmful substances is performed. The mist adheres (adsorbs) to the oily solution 33, the harmful substances are collected in the oily solution 33, and clean air a2 is generated as shown by an arrow L2 in FIG.

Even if a harmful substance remains in the clean air a2 that has flowed through the multilayer filter structure 31 (filter material 30), the clean air a2 (exhaust air a1) is in a wet state with the oil solution 33. Flow through 32. When the clean air a2 (exhaust air a1) containing the harmful substance flows through the honeycomb laminated filter 32, the volatile organic compounds among the harmful substances contained in the clean air a2 are dissolved in the oil solution 33 to remove the harmful substances. The coating mist adheres (adsorbs) to the oily solution 33, and harmful substances are collected in the oily solution 33. By flowing the clean air a2 (exhaust air a1) through the honeycomb laminated filter 32, as shown by an arrow L2 in FIG. 11, clean air a2 from which harmful substances are removed is generated.

The coating system 10 causes the exhaust air a1 to flow through the multilayer filter structure 31 (filter material 30) in a wet state by the oil solution 33, dissolves the volatile organic compounds among the harmful substances in the oil solution 33, and removes harmful gases. By adhering (adsorbing) the coating mist of the substance to the oily solution 33, the volatile organic compound and the coating mist can be collected in the oily solution 33, and when applying the oil-based paint or the water-based paint to the automobile 66. It is possible to remove the volatile organic compounds and harmful substances of the coating mist generated from the exhaust air a1, and to generate the clean air a2 from which the volatile organic compounds and the coating mist are removed from the exhaust air a1.

The coating system 10 is installed on the downstream side of the multilayer filter structure 31 even if the volatile organic compound or the harmful substance of the coating mist passes through the multilayer filter structure 31 and the harmful substance remains in the clean air a2. The harmful substance can be collected in the oily solution 33 flowing in the whole area of the honeycomb laminated filter 32. By using the honeycomb laminated filter 32, the harmful substance is removed from the clean air a2 (exhaust air a1) where the harmful substance remains. Can be removed.

The flow velocity of the exhaust air a1 in the multilayer filter structure 31 gradually decreases due to the air resistance of the filter material 30, and the flow velocity of the exhaust air a1 in the filter material 30 located forward in the air flow direction is high. Although the flow velocity of the exhaust air a1 in the filter material 30 located rearward in the flow direction becomes slower, the entire upper end portion 35 of the rearmost filter material 30 located rearward in the air flow direction in the multilayer filter structure 31. The oily solution 33 is supplied to the filter material 30, and the oily solution 33 infiltrates from the rearmost filter material 30 toward the filter material 30 located forward in the air flow direction, so that the filter material 30 located forward in the air flow direction is removed. Even if the exhaust air a1 quickly flows through the filter material 30 located forward in the air flow direction, the contact time of the exhaust air a1 with the molecules of the oil solution 33 can be lengthened even if the flow speed of the oil solution 33 decreases. Therefore, the harmful substance contained in the exhaust air a1 can be collected in the oily solution 33, and the harmful substance contained in the exhaust air a1 can be surely removed by using the multilayer filter structure 31.

The oily solution 33 that collects the harmful substances contained in the exhaust air a1 and is stored in the storage tank 43 is forced to flow through the pipe line 48 by the circulation pump 46, and is replenished from the storage tank 43 through the pipe line 48. After flowing into the replacement tank 44, it flows into the strainer 47 through the pipe line 51. In the strainer 47, the harmful substances collected in the oily solution 33 are filtered. The oily solution 33 from which harmful substances have been filtered by the strainer 47 flows into the supply tank 45 through the pipe line 51, and is supplied again from the supply tank 45 to the upper end portions 35 and 39 of the multilayer filter structure 31 and the honeycomb laminated filter 32. To be done.

In the coating system 10, the harmful substance collected in the oily solution 33 is filtered by the strainer 47, the oily solution 33 is not saturated with the harmful substance, and the oily solution 33 in which the harmful substance is filtered is multilayered by the circulation pump 46. Since it is supplied to the filter structure 31 (filter material 30) and the honeycomb laminated filter 32, it is possible to reliably collect the harmful substances contained in the exhaust air a1 by using the new oily solution 33 in which the harmful substances are filtered. Therefore, the volatile organic compounds and harmful substances of the coating mist can be reliably removed from the exhaust air a1.

In the motor damper 62 installed inside the outside air intake duct 53, the opening of the turning blade is the opening of the opening signal transmitted from the controller 22, and the outside air a3 flows through the first air filter unit 57. Meanwhile, as shown by the arrow L3 in FIG. 11, a predetermined proportion of outside air a3 flows into the lower portion of the housing 24 through the air flow path of the motor damper 62. When the outside air a3 flows through the first air filter unit 57, the dust contained in the outside air a3 is collected by the first air filter unit 57. In the lower part of the housing 24, the clean air a2 generated by the multilayer filter structure 31 and the honeycomb laminated filter 32 and the outside air a3 passing through the motor damper 62 are mixed to generate mixed air a4.

The mixed air a4 flows into the deodorizing device 55 through the air supply fan 54. In the deodorizing device 55, the odor contained in the mixed air a4 is removed. The mixed air a4 from which the odor is removed flows from the deodorizing device 55 into the first air supply duct 52a. In the motor damper 63 installed inside the first air supply duct 52a, the opening of the swirl vane is the opening of the opening signal transmitted from the controller 22, and a predetermined proportion of the mixed air a4 is supplied to the motor damper 63. The air is discharged from the discharge port 59 to the outside through the air passage.

Further, the motor damper 64 installed inside the first air supply duct 52a has the opening of the turning vane set to the opening of the opening signal transmitted from the controller 22, and a predetermined ratio of the mixed air a4 is supplied to the motor. The air flows into the second air supply duct 52b from the air supply port 60 through the air flow path of the damper 64. A part of the mixed air a4 that has flowed into the second air supply duct 52b flows into the air conditioner 56, and the mixed air a4 whose humidity and temperature have been adjusted by the air conditioner 56 is supplied from the air conditioner 56 to the second air conditioner 56. It flows into the air duct 52b.

As shown by the arrow L4 in FIG. 11, the mixed air a4 flows through the second air filter unit 58 and is supplied to the coating booth 11 from the ceiling 17 of the coating booth 11. When the mixed air a4 flows through the second air filter unit 58, the dust contained in the mixed air a4 is collected by the second air filter unit 58. The coating system 10 uses the air filter units 57 and 58 to remove the dust contained in the outside air a3 and the mixed air a4, and thus supplies the mixed air a4 from which the dust has been removed to the coating booth 11. Therefore, the painting work can be performed in a comfortable environment filled with the dust-removed mixed air a4.

The motor damper 63 (exhaust amount adjusting means) and the motor damper 64 (supply amount adjusting means) exhaust a predetermined proportion of the mixed air a4 to the outside, and paint a larger proportion of the mixed air a4 to the outside. Air is supplied to the coating booth 11 from the ceiling 17 of the booth 11. The ratio of the mixed air a4 exhausted to the outside is in the range of 10 to 35% when the entire mixed air a4 is 100%, and the ratio of the mixed air a4 supplied to the coating booth 11 is the mixed air. When the entire air a4 is 100%, it is in the range of 65 to 90%.

The room pressure sensor 25 sends the measured room pressure of the coating booth 11 to the controller 22. The controller 22 compares the measured room pressure of the coating booth 11 transmitted from the room pressure sensor 25 with a preset set room pressure of the coating booth 11 so that the measured room pressure falls within the set room pressure range. An opening signal (opening hold signal or opening change signal) is transmitted to the control units of the motor damper 63 (exhaust amount adjusting means) and the motor damper 64 (supply amount adjusting means). The control units of the motor damper 63 and the motor damper 64 adjust the opening degree of the turning blades according to the opening degree signal transmitted from the controller 22. The room pressure of the coating booth 11 is maintained at a positive pressure by a motor damper 63 (exhaust amount adjusting means) and a motor damper 64 (supply amount adjusting means).

When the room pressure of the coating booth 11 becomes negative, the exhaust air a1 containing harmful substances flows back from the recovery mechanism 12 to the coating booth 11, and the coating booth 11 is contaminated and the clean air a2 cannot be generated. In the coating system 10, by keeping the room pressure of the coating booth 11 at a positive pressure, the exhaust air a1 can be reliably recovered by the recovery mechanism 12, and the exhaust air a1 can flow into the air cleaning mechanism 13. The clean air a2 (mixed air a4) from which harmful substances have been removed can be supplied to the coating booth 11.

The temperature sensor 26 transmits the measured temperature of the coating booth 11 to the controller 22. The controller 22 compares the measured temperature of the coating booth 11 transmitted from the temperature sensor 26 with a preset temperature of the coating booth 11, and adjusts the temperature of the air conditioner 56 so that the measured temperature falls within the set temperature range. A temperature signal (a temperature hold signal or a temperature change signal) is transmitted to the control unit. The control unit of the air conditioner 56 controls the air conditioning function according to the temperature signal transmitted from the controller 22, and supplies the mixed air a4 adjusted to the set temperature to the second air supply duct 52b. The coating system 10 can create a favorable temperature environment in the coating booth 11 by adjusting the temperature inside the coating booth 11 by the air conditioner 56, and can perform the coating work in a comfortable environment.

The humidity sensor 27 transmits the measured humidity of the coating booth 11 to the controller 22. The controller 22 compares the measured humidity of the coating booth 11 sent from the humidity sensor 27 with the preset humidity of the coating booth 11, and adjusts the humidity of the air conditioner 56 so that the measured humidity falls within the set humidity range. A humidity signal (humidity hold signal or humidity change signal) is transmitted to the control unit. The control unit of the air conditioner 56 controls the air conditioning function according to the humidity signal transmitted from the controller 22, and supplies the mixed air a4 adjusted to the set humidity to the second air supply duct 52b.

When the coating system 10 applies the water-based paint to the automobile 66 (object to be coated) in the coating booth 11, for example, if the humidity inside the coating booth 11 is high, the drying of the water-based paint is delayed, but the coating by the air conditioner 56 is performed. By lowering the humidity inside the booth 11, it is possible to accelerate the drying of the water-based paint and improve the efficiency of the painting work. In the coating system 10, when the humidity inside the coating booth 11 is unnecessarily low, the water-based paint dries early and the leveling of the coating surface is reduced. However, the humidity inside the coating booth 11 is increased by the air conditioner 56. Thus, it is possible to prevent early drying of the water-based paint, prevent a decrease in the leveling of the painted surface, and prevent an increase in defective painting.

In the coating system 10, harmful substances and dusts are removed, and the mixed air a4 whose temperature and humidity are adjusted is supplied to the coating booth 11. While the system 10 is operating, painting work is performed in the painting booth 11 and harmful substances are mixed in the mixed air a4. However, the exhaust air a1 (mixed air a4) containing the harmful substances is collected in the recovery duct 29→multilayer filter structure. The object 31→honeycomb laminated filter 32→first air supply duct 52a→second air supply duct 52b→paint booth 11 is circulated in this order to remove harmful substances and dust, and the temperature and humidity are adjusted to be mixed air. The a4 is constantly supplied to the coating booth 11.

The coating system 10 can supply the clean air a2, which is obtained by removing harmful substances from the exhaust air a1, to the coating booth 11, so that the worker working in the coating booth 11 does not inhale the volatile organic compound or the coating mist. The coating work can be performed in a good environment that does not damage the health of the worker.

10 Coating System 11 Coating Booth 12 Collection Mechanism 13 Air Cleaning Mechanism 14 Air Supply Mechanism 15 Panel 16 Side Wall 17 Ceiling 18 Floor 19 Rear Wall 20 Door 21 Doorway 22 Controller 23 Lighting Fixture 24 Housing 25 Room Pressure Sensor 26 Temperature Sensor 27 Humidity Sensor 28 Underfloor 29 Recovery Duct 30 Filter Material 31 Multilayer Filter Structure 32 Honeycomb Laminated Filter 33 Oily Solution 34 Supplying Means 35 Upper End 36 Central Part 37 Lower End 38 Side 39 Upper End 40 Center 41 Lower End 42 Side 43 Storage Tank 44 Replenishment and replacement tank 45 Supply tank 46 Circulation pump 47 Strainer 48 Pipe line 49 First supply port 50 Second supply port 51 Pipe line 52 Air supply duct 52a First air supply duct 52b Second air supply duct 53 Outside air intake duct 54 Supply Air fan 55 Deodorizer 56 Air conditioner 57 First air filter unit 58 Second air filter unit 59 Discharge port 60 Air supply port 61 Intake port 62 Motor damper (inflow amount adjusting means)
63 Motor damper (displacement control means)
64 motor damper (supply air volume adjustment means)
65 Outside air intake 66 Automobile (painted object)
a1 Exhaust air a2 Clean air a3 Outside air a4 Mixed air

Claims (11)

A coating booth of a predetermined volume for applying the coating material to the object to be coated, a recovery mechanism for recovering exhaust air containing a harmful substance consisting of at least a volatile organic compound of the volatile organic compound and the coating mist from the coating booth, and the recovery An air purifying mechanism that collects harmful substances from the exhaust air collected by the mechanism to generate clean air, and a mixed air that mixes the clean air generated by the air purifying mechanism and the outside air to the coating booth. In a coating system for supplying the residual mixed air to the coating booth while exhausting a part of the mixed air,
The air cleaning mechanism is a porous filter material made of synthetic fiber and having a predetermined thickness and a predetermined area, an oil solution supplied to the filter material to keep the entire filter material in a wet state, and the oil solution. Is supplied to the filter material, the coating system causes the exhaust air to flow through the filter material in a wet state by the oily solution, and the harmful substances contained in the exhaust air are mixed with the oily material. A coating system characterized by being collected in a solution. In the air cleaning mechanism, a plurality of the filter materials form a multi-layer filter structure aligned in the air flow direction in a state where the surfaces thereof are overlapped, and the supply unit supplies the air flow of the multi-layer filter structure. Supplying the oily solution to the upper end of the rearmost filter material located in the direction rear, while the oily solution infiltrates from the last filter material toward the filter material located in the air flow direction front, The coating system according to claim 1, wherein the coating system flows from the upper end portion of the filter material toward the lower end portion and flows downward from the lower end portion of the filter material. The air cleaning mechanism includes a honeycomb laminated filter having a predetermined thickness and a predetermined area installed on the downstream side of the multilayer filter structure, and the supply means supplies the oil solution to the upper end of the honeycomb laminated filter. The whole of the honeycomb laminated filter is kept in a wet state, and the oily solution flows from the upper end portion to the lower end portion of the honeycomb laminated filter while flowing out from the lower end portion of the honeycomb laminated filter to the coating. The coating system according to claim 2, wherein the system causes the exhaust air to flow through the honeycomb laminated filter that is wet by the oily solution, and collects the harmful substance contained in the exhaust air in the oily solution. A storage tank, wherein the supply means is located below the multilayer filter structure and the honeycomb laminated filter, and stores an oily solution flowing downward from the multilayer filter structure and the honeycomb laminated filter, and the storage tank. A circulation pump that supplies the oily solution contained in the filter material to the upper end portion of the filter material and the upper end portion of the honeycomb laminated filter, and a strainer that filters harmful substances captured in the oily solution, and the oily solution The oil solution is made to flow from the upper end to the lower end of the filter material while the solution is being circulated, and the oil solution is made to flow from the upper end to the lower end of the honeycomb laminated filter. Painting system. The air cleaning mechanism includes a supply amount adjusting means for adjusting the supply amount of the oily solution to be supplied to the multilayer filter structure and the honeycomb laminated filter, and the supply amount adjusting means supplies air to the coating booth. When the supply amount of air is large, the supply amount of the oil solution supplied to the multilayer filter structure and the honeycomb laminated filter is increased, and the supply amount of the mixed air supplied to the coating booth is small, the The coating system according to claim 4, wherein the supply amount of the oily solution supplied to the multilayer filter structure and the honeycomb laminated filter is reduced. The coating system according to any one of claims 1 to 5, wherein the air supply mechanism includes a deodorizing device that removes an odor contained in the mixed air. The coating system according to claim 1, wherein the air supply mechanism includes an air conditioner that adjusts at least one of temperature and humidity of the mixed air. The air supply mechanism forcibly supplies the mixed air, an air supply fan, an inflow amount adjusting means for adjusting an inflow amount of the outside air, and an exhaust amount adjustment for adjusting an exhaust amount of the mixed air to the outside. Means and an air supply amount adjusting means for adjusting an air supply amount of the mixed air to the coating booth, and a predetermined ratio of the mixed air to the outside by the exhaust amount adjusting means and the air supply amount adjusting means. While exhausting, the mixed air is supplied from the ceiling of the coating booth at a ratio higher than that of the mixed air exhausted to the outside, and the recovery mechanism causes the exhausted air to flow under the floor of the coating booth. The coating system according to any one of claims 1 to 7, wherein air is made to flow into the air cleaning mechanism from under the floor. The coating system according to claim 8, wherein the air supply mechanism holds the room pressure of the coating booth at a positive pressure by the exhaust gas amount adjusting means and the air supply amount adjusting means. The air supply mechanism is installed in the intake of the outside air to collect dust contained in the outside air, and air installed in the ceiling of the coating booth to collect dust contained in the mixed air. The coating system according to any one of claims 1 to 9, further comprising a filter. The coating system according to any one of claims 1 to 10, wherein the oily solution is liquid petrolatum.

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