JP6970962B2 - Painting system - Google Patents

Description

The present invention relates to a coating system that removes harmful substances generated in the coating process of paint on an object to be coated from exhaust air, and supplies a mixed air that is a mixture of return air air from which harmful substances have been removed and outside air to a coating booth.

A painting booth where the upper part becomes a painting room and the lower part becomes an exhaust room, and exhaust air can flow from the painting room to the exhaust room, and a painting machine installed in the painting room that sprays paint toward the object to be painted as paint particles. A paint separating device having a filter installed in the exhaust chamber and having a filter for separating paint particles carried from the painting chamber together with the exhaust air from the exhaust air, and a precoat material being ejected toward the exhaust air flowing into the paint separating device. A filter accommodating cover and a filter accommodating cover, which are equipped with a precoat material ejection device and have a paint separating device, which is a hopper part in which the upper side opens while accommodating the filter and the lower side receives the collected material collected by the filter. It has an upper cover that closes the upper opening, and an exhaust air inflow path that guides the exhaust air from the lower side to the upper side toward the upper side of the filter is formed between the filter accommodating cover and the upper cover, and is a precoat material ejection device. A coating booth device in which the ejection port of the above is located in the exhaust air inflow path is disclosed (see Patent Document 1).

Japanese Unexamined Patent Publication No. 2016-36757

In the coating booth device disclosed in Patent Document 1, the precoat material ejected from the precoat material ejection device and adsorbing the paint particles contained in the exhaust air is collected by the filter of the paint separation device, so that the precoat material is collected from the exhaust air. At the same time, the paint particles can be separated, and the air in which the paint particles are separated can be generated. When an oil-based paint is applied to an object to be coated, volatile organic compounds (hydrogenates such as benzene, toluene and xylene, and organic chlorine-based compounds such as trichloroethylene, tetrachloroethylene and dichloroethane) contained in the oil-based paint are scattered and volatile. Exhaust air containing volatile organic compounds is discharged from the coating booth. In the coating booth device disclosed in Patent Document 1, the volatile organic compounds pass through the filter of the paint separation device and the volatile organic compounds are collected by the filter. The exhaust air containing the volatile organic compounds is released to the outside, and the air is polluted by the volatile organic compounds. Further, the exhaust air containing the volatile organic compound is returned to the painting booth again, and the worker working in the painting 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 volatile organic compounds and coating mist, and to remove harmful substances from exhaust air. It is an object of the present invention to provide a painting system capable of supplying a mixed air mixed with outside air to a painting booth. Another object of the present invention is to supply a mixed air, which is a mixture of return air obtained by removing harmful substances from exhaust air and outside air, to the painting booth without damaging the health of workers working in the painting booth. The purpose is to provide a painting system capable of performing painting work in a favorable environment. Another object of the present invention is to generate return air by removing harmful substances from the exhaust air, so that even if the mixed air containing the return air is exhausted to the outside, the air is not polluted and the environment is polluted. Is to provide a painting system that can prevent.

The coating system according to the present invention for solving the above problems includes a coating booth having a predetermined volume for applying paint to an object to be coated, and volatile organic compounds and coating mist generated in the process of coating the paint on the object to be coated. A recovery mechanism that collects exhaust air containing harmful substances consisting of at least volatile organic compounds from the painting booth, a collection mechanism that collects harmful substances from the exhaust air collected by the recovery mechanism, and a collection mechanism that collects harmful substances. An air supply mechanism that supplies mixed air, which is a mixture of collected return air and outside air, to the painting booth, a humidifying element that has a predetermined thickness and a predetermined area and extends in the horizontal direction, and water is supplied to the humidifying element. A humidifying mechanism having a water supply means is provided, and the collecting mechanism has a predetermined thickness and a predetermined area and extends in the vertical direction, and is supplied to the collecting element to keep the entire collecting element in a wet state. It includes a fluidized paraffin and a supply means for supplying the fluidized paraffin to the collection element, and in the collection mechanism, exhaust air is passed through the collection element which is in a wet state by the fluidized paraffin supplied by the supply means. In the humidification mechanism, the humidifying element is installed on the downstream side of the collection element and is moistened by the water supplied by the water supply means. It is characterized in that the returning air is passed through the humidifying element in a state, and the returning air is humidified by vaporizing the water that has infiltrated into the humidifying element .

As an example of the present invention, the supply means is located above the collection element to supply fluid paraffin to the upper end of the collection element, and is located below the collection element from the collection element. It includes a storage container for containing the spilled fluid paraffin, a circulation pump for flowing the fluid paraffin contained in the storage container into the supply container, and a filtration device for filtering harmful substances collected in the liquid paraffin. In the supply means, the fluid paraffin is circulated from the storage container to the supply container by using a circulation pump, and the fluid paraffin is flowed from the upper end portion to the lower end portion of the collection element.

As another example of the present invention, the supply means increases the supply amount of the fluidized paraffin supplied to the collection element as the supply amount of the mixed air supplied to the painting booth increases, and supplies the fluid paraffin to the painting booth. As the amount of air supplied to the air-conditioned mixed air decreases, the amount of fluid paraffin supplied to the collection element is reduced.

As another example of the present invention, the painting system includes a humidity sensor that measures the humidity inside the painting booth, and the water supply means has a measured humidity measured by the humidity sensor lower than a preset set humidity. , Increase the amount of water supplied to the humidifying element, and decrease or stop the amount of water supplied to the humidifying element when the measured humidity is higher than the set humidity.

As another example of the present invention, the painting system includes a temperature sensor that measures the temperature inside the painting booth, and a cooling / dehumidifying mechanism that lowers the temperature inside the painting booth and lowers the humidity inside the painting booth. In the cooling / dehumidifying mechanism, when the measured humidity measured by the humidity sensor is higher than the preset set humidity, the humidity inside the painting booth is lowered and the measured temperature measured by the temperature sensor is set in advance. If the temperature is higher than the set temperature, the temperature inside the painting booth will be lowered.

As another example of the present invention, when the coating system includes a heating mechanism that raises the temperature inside the coating booth, in the heating mechanism, the measured temperature measured by the temperature sensor is lower than the preset set temperature. , Raise the temperature inside the painting booth.

As another example of the present invention, the heating mechanism circulates between the storage container and the supply container, and the pressurizing means for pressurizing the fluid paraffin circulating between the storage container and the supply container to raise the temperature of the fluid paraffin. It is at least one of the heating means for heating the fluid paraffin to raise the temperature of the fluid paraffin.

As another example of the present invention, the air supply mechanism includes an air supply fan that forcibly supplies the mixed air, an exhaust volume adjusting means for adjusting the displacement of the mixed air to the outside, and a painting booth for the mixed air. The exhaust amount adjusting means exhausts a predetermined ratio of the mixed air to the outside, and the supply air amount adjusting means is more than the mixed air exhausted to the outside, including the supply air amount adjusting means for adjusting the air supply amount to the outside. A ratio of mixed air is supplied from the ceiling of the painting booth toward the floor of the painting booth.

As another example of the present invention, the recovery mechanism causes the exhaust air to flow under the floor of the painting booth, and the exhaust air flows into the collection mechanism from under the floor.

As another example of the present invention, in the painting system, a painting step of applying paint to the object to be coated and a drying step of drying the paint applied to the object to be coated by the coating process are carried out, and in the coating process, supply is performed. While the air mechanism takes in the outside air, the mixed air, which is a mixture of the return air air from which harmful substances are collected by the collection mechanism and the outside air, is supplied to the painting booth. The temperature of the paint is raised to the drying temperature, and the air supply mechanism shuts off the inflow of outside air, and the return air warm air in which harmful substances are collected by the collection mechanism is supplied to the painting booth.

As another example of the present invention, the air supply mechanism is installed in the air filter installed at the intake port of the outside air to collect dust and fine particles contained in the outside air, and is installed in the exhaust port of the mixed air and contained in the mixed air. It includes an air filter that collects dust and fine particles, and an air filter that is installed on the ceiling of the painting booth and collects dust and fine particles contained in the mixed air.

According to the coating system according to the present invention, the exhaust air recovered from the coating booth is passed through the collection element in a wet state by the fluid paraffin supplied to the collection element, and the volatile organic compounds contained in the exhaust air are allowed to pass through. By collecting (dissolving) harmful substances consisting of at least volatile organic compounds with the coating mist in the fluid paraffin, the harmful substances of the volatile organic compounds and coating mist generated in the coating process of the paint on the object to be coated can be removed. It can be removed from the exhaust air, and clean return air with volatile organic compounds and paint mist removed from the exhaust air can be generated, and outside air is mixed with the return air from which harmful substances have been removed from the exhaust air. The mixed air can be supplied to the painting booth. The painting system can supply the painting booth with mixed air, including return air from which harmful substances have been removed from the exhaust air, so workers working in the painting booth may inhale volatile organic compounds and paint mist. It is possible to reduce the number of paints, and the painting work can be performed in a good environment that does not harm the health of the worker. The painting system produces return air by removing harmful substances from the exhaust air, so that even if the mixed air containing the return air is exhausted to the outside, it does not pollute the air and prevent environmental pollution. can.

A supply container located above the collection element to supply fluid paraffin to the upper end of the collection element, and a storage container located below the collection element to store the fluid paraffin flowing out of the collection element. , A circulation pump for flowing the fluid paraffin contained in the storage container into the supply container and a filtration device for filtering harmful substances collected in the fluid paraffin, and the supply means uses the circulation pump to flow. The coating system, which circulates the liquid paraffin from the storage container to the supply container and causes the fluid paraffin to flow from the upper end to the lower end of the collection element, is a volatile organic compound collected (dissolved) in the fluid paraffin. The harmful substances of the paint mist and the paint mist are filtered (removed) by the filtration device, the fluid paraffin is not saturated with the harmful substances, and the clean fluid paraffin from which the harmful substances are filtered is supplied to the collection element by the circulation pump. Therefore, it is possible to reliably collect the harmful substances contained in the exhaust air by using clean fluid paraffin filtered with volatile organic compounds and harmful substances of coating mist, and the harmful substances can be reliably collected from the exhaust air. Can be removed. The coating system constantly flows clean fluid paraffin, which is filtered from volatile organic compounds and harmful substances of coating mist, to the collection element by flowing the fluid paraffin from the upper end to the lower end of the collection element. The clean fluid paraffin can keep the collection element moist while supplying it, and the fluid paraffin that flows from the upper end to the lower end of the collection element is used to contain harmful substances in the exhaust air. The substance can be reliably collected.

As the amount of mixed air supplied to the painting booth increases, the amount of fluid paraffin supplied to the collection element increases, and as the amount of mixed air supplied to the painting booth decreases. The coating system, which reduces the supply of fluid paraffin to the collection element, increases the supply of fluid paraffin to the collection element as the amount of mixed air supplied to the coating booth increases. By increasing, the required amount of clean fluid paraffin filtered with harmful substances can be supplied to the collection element, and the volatile organic compounds contained in the mixed air can be prevented from being saturated with the harmful substances in the fluid paraffin. Hazardous substances such as compounds and paint mist can be reliably collected in fluid paraffin, and return air from which harmful substances have been removed can be generated. The painting system prevents oversupply of fluid paraffin and circulates by reducing the supply of fluid paraffin supplied to the collection element as the amount of mixed air supplied to the painting booth decreases. It is possible to reduce the power consumption of the pump and save energy in the system.

It includes a humidifying mechanism installed on the downstream side of the collection element and having a predetermined thickness and a predetermined area and extending in the horizontal direction, and a water supply means for supplying water to the humidifying element, and the water is supplied by the water supply means. A painting system that humidifies the return air by allowing the return air to flow through the humidification element that is moistened by water and vaporizing the water that has penetrated into the humidification element applies water-based paint to the object to be coated in the painting booth. In this case, if the humidity inside the painting booth is lower than necessary, the water-based paint dries early and the leveling of the painted surface decreases. Premature drying of the paint can be prevented, deterioration of the leveling of the painted surface can be prevented, and an increase in coating defects can be prevented. Since the painting system can optimize the humidity inside the painting booth by the humidification mechanism, the worker can perform the painting work in a favorable environment.

Includes a humidity sensor that measures the humidity inside the painting booth, and if the measured humidity measured by the humidity sensor is lower than the preset set humidity, the amount of water supplied to the humidifying element is increased and the measured humidity is increased. When the humidity is higher than the set humidity, the painting system that reduces or stops the amount of water supplied to the humidifying element says that when applying water-based paint to the object to be painted in the painting booth, the humidity inside the painting booth is lower than necessary. If the water-based paint dries early and the leveling of the painted surface decreases, but the measured humidity measured by the humidity sensor is lower than the preset set humidity, the amount of water supplied to the humidifying element is increased. As a result, the return air can be sufficiently humidified by the vaporization of the water that has infiltrated into the humidifying element, and the water-based paint can be prevented from drying early, and the leveling of the painted surface can be prevented from deteriorating. It is possible to prevent the increase of defects. On the contrary, if the humidity inside the painting booth is high, the drying of the water-based paint is delayed, but if the measured humidity is higher than the set humidity, the water absorption amount of the water supplied to the humidifying element is reduced or stopped, so that the painting booth The humidity inside can be lowered, the drying of the water-based paint can be accelerated, and the efficiency of the painting work can be improved. Since the painting system can optimize the humidity inside the painting booth by the humidification mechanism, a good humidity environment can be created in the painting booth, and the worker can perform the painting work in a comfortable environment.

It includes a temperature sensor that measures the temperature inside the paint booth and a cooling / dehumidifying mechanism that lowers at least one of the temperature and humidity inside the paint booth, and was measured by the humidity sensor in the cooling / dehumidifying mechanism. If the measured humidity is higher than the preset humidity, the humidity inside the paint booth will be lowered, and if the measured temperature measured by the temperature sensor is higher than the preset preset temperature, the internal temperature of the paint booth will be lowered. When applying water-based paint to an object to be coated in a painting booth, if the humidity inside the painting booth is high, the drying of the water-based paint will be delayed, but the measured humidity measured by the humidity sensor is set in advance. When the humidity is higher than the set humidity, the humidity inside the painting booth can be lowered by the cooling / dehumidifying means, so that the drying of the water-based paint can be accelerated and the efficiency of the painting work can be improved. The painting system regulates the temperature and humidity inside the painting booth with a cooling / dehumidifying mechanism, which makes it possible to create a good temperature environment and a good humidity environment in the painting booth, allowing workers to perform painting work in a comfortable environment. It can be carried out.

A painting system that includes a heating mechanism that raises the temperature inside the painting booth and raises the temperature inside the painting booth by the heating mechanism when the measured temperature measured by the temperature sensor is lower than the preset set temperature. If the temperature inside the painting booth is low, the drying of the paint will be delayed, but if the measured temperature measured by the temperature sensor is lower than the preset set temperature, the heating mechanism will raise the temperature inside the painting booth. , The drying of the paint can be accelerated, and the efficiency of the painting work can be improved. By adjusting the temperature inside the painting booth with a heating mechanism, the painting system can create a good temperature environment in the painting booth, and the worker can perform painting work in a comfortable environment.

The heating mechanism pressurizes the fluid paraffin that circulates between the storage container and the supply container to raise the temperature of the fluid paraffin, and the fluid paraffin that circulates between the storage container and the supply container is heated to make it fluid. The coating system, which is at least one of the heating means for raising the temperature of the paraffin, is a fluid paraffin by the pressurizing means or the heating means when the measured temperature measured by the temperature sensor is lower than the preset set temperature. It is possible to accelerate the drying of the paint by raising the temperature of the air flowing through the collection element by the fluid paraffin heated to a predetermined temperature, thereby raising the temperature inside the painting booth. It can improve the efficiency of painting work. The coating system pressurizes the fluidized paraffin by a pressurizing means or heats the fluidized paraffin by a heating means to raise the temperature of the fluidized paraffin, improve its fluidity, and improve the fluidity of the fluidized paraffin. The function of collecting harmful substances is improved, and the volatile organic compounds contained in the exhaust air and the harmful substances of coating mist can be reliably collected in the fluid paraffin. As the temperature of the fluidized paraffin rises, the coating system makes it easier to filter volatile organic compounds and harmful substances of coating mist contained in the fluidized paraffin in the filtering device, and contains harmful substances using the filtering device. Fluid paraffin can be regenerated into clean fluid paraffin from which harmful substances have been filtered (removed), and the clean fluid paraffin from which harmful substances have been filtered can be used to ensure that harmful substances contained in the exhaust air are removed. Can be collected (removed).

An air supply fan that forcibly supplies the mixed air by the air supply mechanism, an exhaust amount adjusting means that adjusts the amount of the mixed air to the outside, and an air supply that adjusts the amount of the air supplied to the painting booth of the mixed air. A painting booth from the ceiling of the painting booth, including the amount adjusting means, in which the exhaust volume adjusting means exhausts a predetermined ratio of mixed air to the outside and the supply air amount adjusting means exhausts a larger proportion of the mixed air to the outside. The painting system that supplies air toward the floor surface can take in fresh outside air (air) inside the painting booth by exhausting a predetermined ratio of mixed air to the outside, and carbon dioxide in the painting booth. The concentration does not increase, and the painting work can be performed in a favorable environment that does not harm the health of the worker.

The painting system, in which the recovery mechanism causes the exhaust air to flow under the floor of the painting booth and the exhaust air flows from under the floor to the collection mechanism, is a volatile organic compound generated during the painting process of the paint on the object to be painted and harmful substances of the painting mist. Since the exhaust air containing toxic substances flows under the floor and flows into the collection mechanism through the underfloor, the exhaust air containing toxic substances does not fill the inside of the painting booth, and the workers working in the painting booth It is possible to reduce the possibility of inhaling volatile organic compounds and painting mist, and it is possible to perform painting work in a favorable environment that does not harm the health of workers.

A painting process of applying paint to the object to be coated and a drying process of drying the paint applied to the object to be coated are carried out. In the painting process, the air supply mechanism takes in outside air and is harmful by the collection mechanism. The mixed air, which is a mixture of the return air in which the substances are collected and the outside air, is supplied to the painting booth, and in the drying process, the temperature inside the painting booth is raised to the drying temperature by a predetermined temperature raising means, and the air supply mechanism. In the painting system, which supplies warm air to the painting booth where harmful substances are collected by the collection mechanism while blocking the inflow of outside air, the air supply mechanism takes in the outside air in the painting process and the collection mechanism takes in the harmful substances. By supplying the painting booth with mixed air that is a mixture of the collected return air and the outside air, it is possible to supply the painting booth with the mixed air containing the return air from which harmful substances have been removed from the exhaust air. The painting work can be performed in a good environment that does not harm the health of the worker. When the paint applied to the object to be coated is dried in the drying process, the painting system raises the temperature inside the painting booth to a predetermined temperature by a heating means, and the air supply mechanism collects the paint while blocking the inflow of outside air. Since the return air warm air in which harmful substances are collected by the mechanism is supplied to the painting booth, the paint applied to the object to be coated can be quickly dried by circulating the return air warm air at a high temperature. The efficiency of painting work can be improved.

An air filter installed at the intake of the outside air to collect dust and fine particles contained in the outside air, an air filter installed at the exhaust port of the mixed air to collect dust and fine particles contained in the mixed air, and a painting booth. A painting system that includes an air filter that is installed on the ceiling and collects dust and fine particles contained in the mixed air can use these air filters to remove dust and fine particles contained in the outside air and the mixed air. Therefore, the mixed air from which dust and fine particles have been removed can be supplied to the painting booth, and the painting work can be performed in a comfortable environment filled with the mixed air from which dust and fine particles have been removed. In the painting system, the mixed air from which dust and fine particles have been removed is exhausted to the outside, so that the air is not polluted and environmental pollution can be prevented.

A side view of a painting system shown as an example. Top view of the painting system. Front view of the painting system. Rear view of the painting system. A side view of the painting system showing the inside of the painting booth. FIG. 2 is a cross-sectional view taken along the line AA of FIG. A side view of a collection mechanism, an air supply mechanism, and a humidification mechanism shown as an example. The perspective view of the collection element shown as an example. The perspective view of the collection element shown as another example. The perspective view of the honeycomb laminated element shown as an example. The perspective view of the humidifying element shown as an example. The perspective view of the humidifying element shown as another example. The side view of the cooling / dehumidifying mechanism shown as an example. A side view of the painting system showing the inside of the painting booth in the painting process. Perspective view of the collection element supplied with fluidized paraffin. Perspective view of another example of a collection element supplied with fluidized paraffin. Perspective view of a honeycomb laminated element supplied with fluidized paraffin. A perspective view of a humidifying element to which water is supplied. A perspective view of another example of a humidifying element to which water is supplied. A side view of the painting system showing the inside of the painting booth in the drying process.

The details of the coating system according to the present invention will be described below with reference to the attached 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 painting system 10, and FIG. 3 is a front view of the painting system 10. FIG. 4 is a rear view of the painting system 10, and FIG. 5 is a side view of the painting system 10 showing the inside of the painting booth 11. FIG. 6 is a cross-sectional view taken along the line AA of FIG. In FIG. 1, the collection mechanism 13, the sensors 29 to 31, and the air filter units 62 to 64 are shown by solid lines. In FIG. 2, the supply / replacement container 50 and the strainer 53 (filtration device) are not shown.

The coating system 10 is used in a painting process of applying paint to an object to be coated, and is also used in a drying step of drying the paint applied to the object to be coated by the coating process. Although the automobile 35 is illustrated as the object to be coated in FIG. 5, the object to be coated is not limited to the automobile 35, and the coating system 10 can be used in the coating process and the drying process for any object to be coated.

The painting system 10 applies paint to the automobile 35 (object to be coated), and collects the paint booth 11 having a predetermined volume for drying the paint applied to the automobile 35 and the exhaust air of the paint booth 11 from the paint booth 11. The mechanism 12, the collection mechanism 13 that collects harmful substances from the exhaust air to generate return air, and the return air generated by the collection mechanism 13 are painted with mixed air or return air mixed with outside air. Cooling that lowers at least one of the air supply mechanism 14 that supplies air to the booth 11, the humidification mechanism 15 that humidifies the return air supplied to the painting booth 11, and the temperature and humidity inside the painting booth 11. It is provided with a dehumidifying mechanism 16, a heating mechanism 17 for raising the temperature inside the painting booth 11, and a heating means 18 (gas burner) used in the drying step.

The painting booth 11 is a panel booth in which a plurality of panels 19 are connected, and a vertical pumping type is adopted. A semi-down method can also be adopted. In the painting booth 11, the side walls 20, the ceiling 21, the floor 22, and the rear wall 23 are formed by each panel 19. The painting booth 11 has a door 24 on the side wall 20 and an entrance 25 (accordion type gate) of the automobile 35 in front of the painting booth 11. A controller 26 (control device) is attached to the side wall 20 of the painting booth 11. A lighting fixture 27 is installed on the ceiling 21 of the painting booth 11. A housing 28 extending in the vertical direction is installed on the rear wall 23 of the painting booth 11.

Although not shown, the painting booth 11 is equipped with various painting equipment (spray gun, electrostatic coating machine, airbrush, painting stirrer, compressor, elevator, etc.). In the painting booth 11, after opening the doorway 25 and transporting the automobile 35 into the painting booth 11, the doorway 25 is closed and the painting equipment performs painting work (painting process) on the painted surface of the automobile 35 and painting. A drying step of drying the paint applied to the automobile 35 is performed by the step.

A room pressure sensor 29, a temperature sensor 30, and a humidity sensor 31 are installed inside the painting booth 11. The room pressure sensor 29, the temperature sensor 30, and the humidity sensor 31 are connected to the controller 26. The room pressure sensor 29 measures the room pressure inside the painting booth 11, and transmits the measured measurement room pressure to the controller 26. The temperature sensor 30 measures the temperature inside the painting booth 11 and transmits the measured measured temperature to the controller 26. The humidity sensor 31 measures the humidity inside the painting booth 11 and transmits the measured humidity to the controller 26. In addition to these sensors 29 to 30, a concentration sensor for measuring the concentration of carbon monoxide and a combustible gas leak detector for detecting a leak of combustible gas may be installed.

When the oil-based paint is applied to the automobile 35 (painted object) in the painting booth 11 (painting step), or when the applied oil-based paint is dried (drying step), the volatile organic compounds (benzene, Hydrocarbons such as toluene and xylene, and organic chlorine-based compounds such as trichloroethylene, tetrachloroethylene and dichloroethane) are scattered, and the coating mist of the oil-based paint is scattered and dispersed in the air (inside the coating booth 11). The exhaust air recovered from the painting booth 11 contains volatile organic compounds and harmful substances consisting of painting mist.

The collection mechanism 12 has a plurality of air recovery ports (not shown) installed on the floor 22 of the painting booth 11, and a recovery duct installed under the floor 32 of the painting booth 11 and extending between the entrance 25 and the rear wall 23. It is formed from 33. Exhaust air in the painting process and the drying process that has passed through the air recovery port flows into the recovery duct 33. The recovery duct 33 is connected to the lower portion 34 of the housing 28 and communicates with the housing 28, from at least the volatile organic compounds of the volatile organic compounds and the coating mist generated in the painting process of the paint and the drying process of the paint on the automobile 35. Exhaust air containing harmful substances is recovered from the painting booth 11. The recovery duct 33 causes the collected exhaust air to flow into the collection mechanism 13 in the housing 28.

FIG. 7 is a side view of the collection mechanism 13, the air supply mechanism 14, and the humidification mechanism 15 shown as an example, and FIG. 8 is a perspective view of the collection element 36 shown as an example. FIG. 9 is a perspective view of the collection element 36 shown as another example, and FIG. 10 is a perspective view of the honeycomb laminated element 37 shown as an example. FIG. 11 is a perspective view of the humidifying element 73 shown as an example, and FIG. 12 is a perspective view of the humidifying element 73 shown as another example.

The collection mechanism 13 is installed in the lower part 34 of the housing 28 and collects harmful substances (volatile organic compounds and coating mist) from the exhaust air collected by the collection mechanism 12. The collection mechanism 13 is formed of a collection element 36 (multilayer filter structure), a honeycomb laminated element 37, a fluid paraffin 38, and a supply means 39.

The collection element 36 is a multi-layer filter material made of a plurality of porous (porous structure) filters 40 overlapping in the air flow direction (front-back direction, thickness direction of the collection element 36) of the exhaust air, and has a predetermined thickness. And it has a predetermined area and extends in the vertical direction. The collection element 36 has an upper end portion 41 and a lower end portion 43, and a central portion 42 and both side portions 44. The filter 40 for forming the collection element 36 is a non-woven fabric or felt made of synthetic fibers having a large number of fiber gaps, has a predetermined thickness and a predetermined area, and has an air flow direction (in a state where the surfaces are overlapped with each other). They are lined up in the front-back direction).

In the collection element 36 shown in FIG. 8, four filters 40 having a substantially flat surface overlap each other in the air flow direction (front-rear direction, thickness direction of the collection element 36). In the collection element 36 shown in FIG. 9, four filters 40 that repeat undulations in a wavy shape overlap in the air flow direction (front-rear direction, thickness direction of the collection element 36). The number of filters 40 overlapping in the air flow direction is not particularly limited, and three or less filters 40 may form the collection element 36, and five or more filters 40 form the collection element 36. You may be doing it.

The honeycomb laminated element 37 combines a sheet-like material and a corrugated material made from at least one of ceramic fiber paper, glass fiber paper, flame-retardant paper, activated carbon paper, non-woven fabric, and felt, and combines them. It is a laminated filter material and has a predetermined thickness and a predetermined area. The honeycomb laminated element 37 is installed on the downstream side (rear in the air flow direction) of the collection element 36 (multilayer filter structure), and is separated from the collection element 36 by a predetermined dimension in the rear in the air flow direction (rear in the front-rear direction). ing. The honeycomb laminated element 37 has an upper end portion 45 and a lower end portion 47, and a central portion 46 and both side portions 48.

The fluid paraffin 38 is a polymer compound, and is a harmful substance (volatile organic) contained in the exhaust air while keeping the entire area of the collection element 36 (multilayer filter structure) and the entire area of the honeycomb laminated element 37 in a wet state. Collect by dissolving (compound, coating mist) (take in by dissolving). The fluid paraffin 38 flows from the upper end 41 of the collection element 36 toward the lower end 43 through the central 42, and from the upper end 45 of the honeycomb laminated element 37 through the central 46 to the lower end 47. It flows toward.

The supply means 39 is formed of a storage container 49 (drain pan), a supply / replacement container 50, a supply container 51 (fuel supply header), a circulation pump 52, and a strainer 53 (filtration device), and includes a supply amount adjusting means. The supply means 39 circulates the fluid paraffin 38 from the storage container 49 to the supply container 51 by using the circulation pump 52, and causes the fluid paraffin 38 to flow from the upper end portion 41 to the lower end portion 43 of the collection element 36. The fluidized paraffin 38 is allowed to flow from the upper end portion 45 of the honeycomb laminated element 37 toward the lower end portion 47.

The storage container 49 is housed in the lower portion 34 of the housing 28 and is located below (directly below) the collection element 36 and the honeycomb laminated element 37, and the fluid paraffin 38 flowing downward from the lower end portion 43 of the collection element 36 is collected. In addition to accommodating (recovering), the fluid paraffin 38 flowing downward from the lower end 47 of the honeycomb laminated element 37 is accommodating (recovering). The replenishment / replacement container 50 is installed in the storage box 54 attached to the housing 28 and is used for replenishing the fluidized paraffin 38 and exchanging the dirty fluidized paraffin 38. The storage container 49 and the supply / replacement container 50 are connected by a pipeline 55 (metal pipe).

The supply container 51 is housed in the housing 28 and is located directly above the upper end portion 41 of the collection element 36 and the upper end portion 45 of the honeycomb laminated element 37. The supply container 51 has a plurality of first supply ports 56 that open toward the upper end 41 extending between both side portions 44 of the collection element 36, and an upper end portion 45 extending between both side portions 48 of the honeycomb laminated element 37. A plurality of second supply ports 57 that open toward the surface are perforated. The first supply port 56 and the second supply port 57 are arranged so as to be separated by a predetermined dimension between both side portions 44 and 48 of the collection element 36 and the honeycomb laminated element 37. The supply container 51 supplies the liquid paraffin 38 from the first supply port 56 to the upper end 41 of the collection element 36, and supplies the liquid paraffin 38 from the second supply port 57 to the upper end 45 of the honeycomb laminated element 37. ..

The supply / replacement container 50 and the supply container 51 are connected by a pipeline 55 (metal pipe). The circulation pump 52 is installed in a pipeline 55 (metal pipe) extending between the storage container 49 and the strainer 53 (filtering device), forcibly supplies the fluid paraffin 38, and the flow housed in the storage container 49. The sex paraffin 38 is made to flow into the supply container 51. The control unit of the circulation pump 52 is connected to the controller 26. The strainer 53 (filtration device) is installed in a pipeline 55 extending between the supply / replacement container 50 and the supply container 51, filters harmful substances collected in the fluid paraffin 38, and cleans the fluid paraffin 38. To play. The strainer 53 and the supply container 51 are connected by a pipeline 55 (metal pipe).

The supply amount adjusting means adjusts the output of the circulation pump 52 based on the output adjustment signal from the controller 26 to adjust the supply amount of the fluidized paraffin 38 supplied to the collection element 36 and the honeycomb laminated element 37. .. The supply amount adjusting means increases the supply amount of the fluid paraffin 38 supplied to the collection element 36 and the honeycomb laminated element 37 as the supply amount of the mixed air supplied to the painting booth 11 increases. The supply amount adjusting means reduces the supply amount of the fluid paraffin 38 supplied to the collection element 36 and the honeycomb laminated element 37 as the supply amount of the mixed air supplied to the painting booth 11 decreases.

The air supply mechanism 14 is formed of an air supply duct 58, an outside air duct 59, an exhaust duct 60, an air supply fan 61, and first to third air filter units 62 to 64 (air filters), and is an exhaust amount adjusting means and an air supply. It is equipped with a quantity adjusting means. The air supply duct 58 is formed of a first air supply duct 65 extending in the vertical direction and a second air supply duct 66 extending in the front-rear direction. The first air supply duct 65 is connected to the upper portion 67 of the housing 28 and communicates with the housing 28. At the upper part of the first air supply duct 65, a connecting port 68 for allowing the mixed air to flow into the second air supply duct 66 is opened.

The second air supply duct 66 is connected to the connecting port 68 of the first air supply duct 65 and communicates with the first air supply duct 65. The second air supply duct 66 is located on the ceiling 21 of the painting booth 11 and extends between the rear wall 23 of the painting booth 11 and the doorway 25. The second air supply duct 66 is inclined downward from the rear wall 23 toward the entrance / exit 25. The outside air duct 59 has an outside air intake inlet 69 (garari) that opens above the ceiling 21 of the painting booth 11, and extends in the vertical direction adjacent to the first air supply duct 65. The outside air duct 59 is connected to an air supply port 71 formed in the central portion 70 of the housing 28. The outside air duct 59 takes in outside air from the outside air intake port 69 and supplies the outside air to the air supply port 71 of the housing 28. The exhaust duct 60 has an exhaust port 72 (gallery) that discharges (exhausts) a part of the mixed air to the outside, is connected to the top of the first air supply duct 65, and extends upward from the ceiling 21 of the painting booth 11. There is.

The air supply fan 61 is housed in the central portion 70 of the housing 28 and is located above the collection element 36, the honeycomb laminated element 37, and the humidification element 73. The air supply fan 61 causes the mixed air, which is a mixture of the return air and the outside air flowing from the air supply port 71, to flow into the first air supply duct 65, forcibly supplies the mixed air to the painting booth 11, and at the same time. A part of the mixed air is forcibly exhausted to the outside of the painting booth 11. The control unit of the air supply fan 61 is connected to the controller 26.

The first air filter unit 62 (air filter) is installed in the vicinity of the outside air intake port 69 of the outside air duct 59, and collects dust and fine particles contained in the outside air. The second air filter unit 63 (air filter) is installed in the vicinity of the exhaust port 72 of the exhaust duct 60, and collects dust and fine particles contained in the mixed air. The third air filter unit 64 extends between the entrance / exit 25 of the painting booth 11 and the rear wall 23, and hangs down from the ceiling 21 toward the floor 22 in an arc. The third air filter unit 64 collects dust and fine particles contained in the mixed air. For the first to third air filter units 62 to 64, any one of a coarse dust filter, a medium and high performance filter, a HEPA filter, or a composite filter in which these filters are combined can be used.

Motor dampers 74,75 (MD) are used for the exhaust amount adjusting means and the supply air amount adjusting means. The control units of the motor dampers 74 and 75 are connected to the controller 26. The motor damper 74 forming the exhaust amount adjusting means is installed at the connection point between the first air supply duct 65 and the exhaust duct 60, and the air volume of the mixed air flowing from the first air supply duct 65 to the exhaust duct 60 by the swivel vanes. By adjusting, the displacement of the mixed air discharged to the outside from the exhaust duct 60 is adjusted.

The motor damper 75 forming the supply air amount adjusting means is installed in the vicinity of the outside air intake port 69 of the outside air duct 59, and the air volume of the outside air flowing into the outside air duct 59 is adjusted by the swivel vanes to adjust the air volume from the outside air duct 59 to the housing 28. The amount of outside air supplied to (the air supply fan 61) is adjusted. In the exhaust amount adjusting means, a part of the mixed air is exhausted to the outside from the exhaust duct 60 by using the motor damper 74 (exhaust amount adjusting means). In the air supply amount adjusting means, a predetermined amount (air volume substantially the same as the air volume of the mixed air exhausted from the exhaust duct 60) is blown from the outside air duct 59 to the housing 28 (painting booth) by the motor damper 75 (air supply amount adjusting means). Supply air to 11).

The humidifying mechanism 15 is installed in a substantially central portion 70 of the housing 28, and humidifies the return air from which harmful substances (volatile organic compounds and coating mist) have been removed by the collecting mechanism 13. The humidifying mechanism 15 has a humidifying element 73 (multilayer filter structure) installed on the downstream side of the collecting element 36 and the honeycomb laminated element 37 (above the collecting element 36 and the honeycomb laminated element 37), and water in the humidifying element 73. Is formed from a water supply means 76 for supplying water.

The humidifying element 73 is a multi-layered filter material made of a plurality of porous (porous structure) filters 77 overlapping in the air flow direction (vertical direction, thickness direction of the humidifying element) of the exhaust air, and has a predetermined thickness and a predetermined area. It has and extends in the horizontal direction. The humidifying element 73 has one end 78 and the other end 80, and a central portion 79 and both side portions 81. The filter 77 for forming the humidifying element 73 is a non-woven fabric or felt made of synthetic fibers having a large number of fiber gaps, has a predetermined thickness and a predetermined area, and has an air flow direction (upper and lower) in a state where the surfaces are overlapped. (Direction, thickness direction of the humidifying element 73).

The humidifying element 73 extends horizontally from one end 78 toward the other end 80, or descends from one end 78 toward the other end 80 at a predetermined angle (2 to 5 °). May tilt to. Below the humidifying element 73 (immediately below the humidifying element 73), a receiving panel 82 that is inclined at a predetermined angle is installed. The receiving panel 82 drops the water 85 exuded from the humidifying element 73 into the storage container 49 (drain pan).

In the humidifying element 73 shown in FIG. 11, four filters 77 having a substantially flat surface overlap each other in the air flow direction (vertical direction, thickness direction of the humidifying element 73). In the humidifying element 74 shown in FIG. 12, four filters 77 that repeat undulations in a wavy shape overlap each other in the air flow direction (vertical direction, thickness direction of the humidifying element 73). The number of filters 77 overlapping in the air flow direction is not particularly limited, and three or less filters 77 may form the humidifying element 73, and five or more filters 77 form the humidifying element 73. You may.

The water supply means 76 is formed of a water supply container 83 (water supply header) and a water supply pump 84, and includes a water supply amount adjusting means. The water supply means 76 uses the water supply pump 84 to flow the water 85 (tap water) into the water supply container 83, and causes the water 85 to flow from one end 78 to the other end 80 of the humidifying element 73. The water supply container 83 is housed in the housing 28 and is located directly above the humidifying element 73. The water supply container 83 has a water supply port 86 that opens over the entire area of one end 78 extending between both side portions 81 of the humidifying element 73. The water supply container 83 supplies water 85 from the water supply port 86 to the entire area of one end 78 of the collection element 73. The water supply container 83 (water supply header) and the water supply pump 84 are connected by a pipeline 87 (metal pipe). The water supply pump 84 is connected to a water pipe (not shown), and its control unit is connected to the controller 26.

The water supply means 76 adjusts the output of the water supply pump 84 based on the output adjustment signal from the controller 26 to supply water to the humidifying element 73 (the amount of water supplied to the water 85 to flow into the water supply container 83). To adjust. When the measured humidity measured by the humidity sensor 31 is lower than the preset set humidity, the water supply means 76 (controller 26) increases the amount of water supplied to the humidifying element 73 by the water 85, and measures the humidity by the humidity sensor 31. When the measured humidity is higher than the preset humidity, the amount of water supplied to the humidifying element 73 of the water 85 is reduced or stopped.

FIG. 13 is a side view of the cooling / dehumidifying mechanism 16 shown as an example. The cooling / dehumidifying mechanism 16 is a pair of a chiller 88 (absorption chiller) that circulates while controlling the liquid temperature of water or a heat medium, and a pair of heat exchanges with return air by the water or heat medium supplied from the chiller 88. It is formed from the heat exchanger 89 of. The cooling / dehumidifying mechanism 16 lowers the humidity inside the painting booth 11 and lowers the temperature inside the painting booth 11. Alternatively, the humidity inside the painting booth 11 is increased. In addition to the chiller 88, a heat pump (vapor-compression refrigerator) can also be used.

The chiller 88 (cooling / dehumidifying means) is installed on the outside of the housing 28. The control unit of the chiller 88 is connected to the controller 26. The heat exchangers 89 are substantially central 70 of the housing 28 and are installed on both sides of the air supply fan 61. The chiller 88 and the heat exchanger 89 are connected by a pipe line 90 (metal pipe). The heat exchanger 89 uses the water or heat medium created by the chiller 88 to exchange heat with the return air passing through the substantially central portion 70 of the housing 28, and lowers the temperature and humidity of the return air. Alternatively, increase the humidity of the return air.

An example of the heating mechanism 17 that raises the temperature inside the painting booth 11 is an orifice (pressurizing means) (not shown) having a small cross-sectional area of the flow path of the fluidized paraffin 38, and is a strainer 53 (not shown) of the supply means 39. It is formed in a pipeline 55 extending between the filtration device) and the supply container 51. The heating mechanism 17 forms an orifice (pressurizing means) inside the pipe line 55 to increase the output of the circulation pump 52 to increase the flow velocity of the fluid paraffin 38 flowing through the pipe line 55, and the pipe line 55. The pressure of the fluidized paraffin 38 is increased, and the fluidized paraffin 38 is heated (heated) by the frictional heat in the pipe line 55 of the fluidized paraffin 38. The fluid paraffin 38 flowing through the pipeline 55 is heated to 30 to 60 ° C. by an orifice (pressurizing means).

Another example of the heating mechanism 17 that raises the temperature inside the painting booth 11 is a heater (heating means) (not shown) that heats the fluid paraffin 38 flowing through the pipeline 55. The control unit of the heater (heating means) is connected to the controller 26. The heater (heating means) is attached to a pipeline 55 extending between the strainer 53 (filtration device) of the supply means 39 and the supply container 51. The heating mechanism 17 heats (heats) the fluid paraffin 38 flowing through the pipeline 55 to 30 to 60 ° C. by a heater.

The fluidized paraffin 38 heated to 30 to 60 ° C. by an orifice (pressurizing means) or a heater (heating means) is supplied to the collection element 36 or the honeycomb laminated element 37, and is collected in a wet state by the fluid paraffin 38. The exhaust air passing through the element 36 and the honeycomb laminated element 37 is heated by the fluid paraffin 38 heated to 30 to 60 ° C., and is painted with the return air at a predetermined temperature passing through the collecting element 36 and the honeycomb laminated element 37. The temperature inside the booth 11 rises.

An example of the temperature raising means 18 is a gas burner 18 that supplies hot air to the inside of the painting booth 11. The gas burner 18 is installed outside the painting booth 11, and its control unit is connected to the controller 26. The temperature raising means 18 is used in the drying step, and by supplying hot air to the inside of the painting booth 11, the temperature inside the painting booth 11 is raised to the drying temperature.

The controller 26 (control device) is a computer having a central processing unit (CPU or MPU) and a memory (main memory and cache memory) and operated by an independent operating system (OS). The controller 26 has a built-in large-capacity storage area (large-capacity hard disk, etc.), and is connected to input / output devices such as a numeric keypad (not shown), a display (not shown), and a touch panel (not shown). .. The controller 26 turns on / off (start / stop) the chamber pressure sensor 29, the temperature sensor 30, the humidity sensor 31, the circulation pump 52, the air supply fan 61, the motor dampers 74 and 75, and the water supply pump 84.

In the storage area of the controller 26, the set room pressure of the painting booth 11, the set temperature of the painting booth 11, the set humidity of the painting booth 11, the set output of the air supply fan 61 (the flow rate of the mixed air flowing into the painting booth 11), The air supply ratio of the mixed air (ratio of the mixed air flowing into the painting booth 11) and the exhaust ratio of the mixed air (ratio of the mixed air exhausted to the outside) are stored (stored). The set room pressure, set temperature, set humidity, set output (flow rate of mixed air), supply air ratio, and exhaust ratio can be freely changed at any time using the numeric keypad unit or touch panel.

The output of the air supply fan 61 (air volume (flow rate) of the mixed air flowing into the painting booth 11) and the output of the circulation pump 52 (supplied to the collection element 36 and the honeycomb laminated element 37) are supplied to the storage area of the controller 26. The correlation with the supply amount of the fluid paraffin 38) is stored (remembered). In the storage device of the controller 26, the opening degree of the swirling vane of the motor damper 74 corresponding to the supply air ratio of the mixed air (the ratio of the mixed air flowing into the painting booth 11) and the exhaust ratio of the mixed air (mixing to be exhausted to the outside). The opening degree of the swirling vane of the motor damper 75 corresponding to the air ratio) is stored (stored).

The controller 26 compares the measurement chamber pressure inside the painting booth 11 transmitted from the chamber pressure sensor 29 with the set chamber pressure of the painting booth 11, and feedback controls so that the measurement chamber pressure is within the range of the set chamber pressure. I do. When the measurement chamber pressure is higher than the set chamber pressure, the controller 26 transmits an output adjustment signal (output maintenance signal or output decrease signal) to the control unit of the air supply fan 61, and the motor damper 75 (supply air amount adjusting means). ) And the control unit of the motor damper 74 (exhaust amount adjusting means), the opening signal (opening holding signal or opening change signal) of the swivel vane is transmitted to adjust (decrease) the output of the air supply fan 61, and they are used. By adjusting the opening degree of the motor dampers 74 and 75 to lower the room pressure inside the painting booth 11, the room pressure inside the painting booth 11 is maintained at the set room pressure. The room pressure inside the painting booth 11 can be reduced by at least one of the adjustment of the output of the air supply fan 61 and the adjustment of the opening degree of the motor dampers 74 and 75.

When the measurement chamber pressure is lower than the set chamber pressure, the controller 26 transmits an output adjustment signal (output maintenance signal or output increase signal) to the control unit of the air supply fan 61, and the motor damper 75 (supply air amount adjusting means). ) And the control unit of the motor damper 74 (exhaust amount adjusting means), the opening signal (opening holding signal or opening change signal) of the swivel vane is transmitted to adjust (increase) the output of the air supply fan 61, and they are used. By adjusting the opening degree of the motor dampers 74 and 75 to increase the room pressure inside the painting booth 11, the room pressure inside the painting booth 11 is maintained at the set room pressure. The room pressure inside the painting booth 11 can be increased by at least one of the adjustment of the output of the air supply fan 61 and the adjustment of the opening degree of the motor dampers 74 and 75. The controller 26 maintains the chamber pressure inside the painting booth 11 as a positive pressure by the air supply fan 61, the motor damper 75 (air supply amount adjusting means), and the motor damper 74 (exhaust amount adjusting means).

The controller 26 compares the measured temperature inside the coating booth 11 transmitted from the temperature sensor 30 with the preset set temperature of the coating booth 11, and performs feedback control so that the measured temperature falls within the set temperature range. conduct. When the measured temperature is lower than the set temperature, the controller 26 sends an output adjusting signal (output rising signal) to the control unit of the circulation pump 52, and adjusts (increases) the output of the circulation pump 52 to pressurize the orifice (pressurization). The temperature of the fluid paraffin 38 flowing through the means) is raised, or an output adjustment signal (output rise signal) is transmitted to the control unit of the heater (heating means), and the fluid paraffin flows through the pipeline 55 by the heater. The temperature of 38 is raised, and the temperature inside the painting booth 11 is maintained at the set temperature.

When the measured temperature is higher than the set temperature, the controller 26 sends an output adjustment signal (output lowering signal) to the control unit of the circulation pump 52, and adjusts (decreases) the output of the circulation pump 52 to pressurize the orifice (pressurization). Means) The temperature of the fluid paraffin 38 flowing through is lowered, an output adjustment signal (temperature drop signal) is transmitted to the control unit of the chiller 88, and the heat exchanger 89 connected to the chiller 88 is used to use the housing 28. By exchanging heat with the return air passing through the substantially central portion 70 of the above, the temperature of the return air is lowered, and the temperature inside the painting booth 11 is maintained at the set temperature. The temperature inside the painting booth 11 can be lowered by at least one of the adjustment of the 52 output of the circulation pump and the heat exchange by the heat exchanger 89.

The controller 26 compares the measured humidity inside the painting booth 11 transmitted from the humidity sensor 31 with the preset humidity of the painting booth 11, and performs feedback control so that the measured humidity is within the set humidity range. conduct. When the measured humidity is higher than the set humidity, the controller 26 sends an output adjustment signal (water supply decrease signal or water supply stop signal) to the control unit of the water supply pump 84 to reduce or stop the water 85 supplied to the humidifying element 73. (Water supply means), an output adjustment signal (humidity drop signal) is transmitted to the control unit of the chiller 88 (cooling / dehumidifying mechanism 16), and the heat exchanger 89 connected to the chiller 88 is used to substantially central the housing 11. It exchanges heat with the return air passing through 70 to attach the moisture of the return air to the fins of the heat exchanger 89, thereby removing the moisture of the return air and lowering the humidity of the return air for painting. The humidity inside the booth 11 is maintained at the set humidity. The humidity inside the painting booth 11 can be lowered by at least one of the water supply amount adjustment of the water supply pump 84 and the heat exchange by the heat exchanger 89.

When the measured humidity is lower than the set humidity, the controller 26 sends an output adjustment signal (water supply increase signal) to the control unit of the water supply pump 84, increases the water 85 to be supplied to the humidifying element 73 (water supply means), and returns. The humidity of the air and air is increased to keep the humidity inside the painting booth 11 at the set humidity. When the measured temperature is within the set temperature range, the chiller 88 is operated at a low output. In this case, the water vapor vaporized from the humidifying element 73 adheres to the fins of the heat exchanger 89, and the water vapor adhering to the fins of the heat exchanger 89 evaporates, so that the return air passing through the heat exchanger 89 is humidified. Then, the heat exchanger 89 can be used to increase the humidity of the return air to keep the humidity inside the painting booth 11 at the set humidity.

The controller 26 has the output of the air supply fan 61 stored in the storage area (flow rate of the mixed air flowing into the painting booth 11) and the output of the circulation pump 52 (fluidity supplied to the collection element 36 and the honeycomb laminated element 37). The output of the circulation pump 52 is controlled according to the output of the air supply fan 61 based on the correlation with the supply amount of the paraffin 38). The controller 26 (supply means) transmits the output signal (output maintenance signal or output change signal) of the circulation pump 52 confirmed by the correlation to the control unit of the circulation pump 52, and increases the output of the air supply fan 61 (painting booth). The output of the circulation pump 52 is increased (the supply amount of the fluid paraffin 38 supplied to the collection element 36 and the honeycomb laminated element 37 is increased) (supply) as the air supply amount of the mixed air supplied to 11 is increased. The output of the circulation pump 52 is reduced (collection element 36 and honeycomb laminated element 37) as the output of the air supply fan 61 is reduced (the amount of air supplied to the mixed air supplied to the painting booth 11 is reduced). The supply amount of the fluid paraffin 38 supplied to the pump is reduced) (supply amount adjusting means).

FIG. 14 is a side view of the coating system 10 showing the inside of the coating booth 11 in the coating process, and FIG. 15 is a perspective view of the collection element 36 to which the fluidized paraffin 38 is supplied. FIG. 16 is a perspective view of another example of the collecting element 36 to which the fluidized paraffin 38 is supplied, and FIG. 17 is a perspective view of the honeycomb laminated element 37 to which the fluidized paraffin 38 is supplied. FIG. 18 is a perspective view of the humidifying element 73 supplied with water 85, and FIG. 19 is a perspective view of another example of the humidifying element 73 supplied with water 85. In FIG. 14, the flow of the exhaust air a1, the return air a2, the outside air a3, and the mixed air a4 is indicated by arrows L1 to L4, and in FIGS. 15 to 17, the flow of the fluidized paraffin 38 is indicated by an arrow L5.

When performing painting work (painting process) in the painting booth 11, the operator turns on the switch of the controller 26. When the switch of the controller 26 is turned on, the initial screen (menu screen) (not shown) is displayed on the display or the touch panel connected to the controller 26. On the initial screen, a painting process selection button, a drying process selection button, and an OFF button are displayed. When the OFF button is clicked (tapped), the painting system 10 is stopped (the same applies to the OFF button below).

When the painting process selection button is clicked (tapped), the painting process screen (not shown) is displayed on the display or touch panel. A condition display area, a condition input button, a system operation button, and an OFF button are displayed on the painting process screen. The condition display area includes a set room pressure display area that displays the set room pressure of the painting booth 11, a set temperature display area that displays the set temperature of the painting booth 11, and a set humidity display area that displays the set humidity of the painting booth 11. The set output display area displaying the set output of the air supply fan 61, the supply air ratio display area displaying the supply air ratio of the mixed air a4, and the exhaust ratio display area displaying the exhaust ratio of the mixed air a4 are displayed.

To enter or change each condition, click the condition input button on the painting process screen. When the condition input button is clicked (tapped), the condition input screen (not shown) is displayed on the display. On the condition input screen, a room pressure input area, a temperature input area, a humidity input area, an output input area, an air supply ratio input area, an exhaust ratio input area, a setting button, a clear button, and a cancel button are displayed.

Click (tap) the clear button to clear the conditions entered in each input area and re-enter the conditions in each input area (the same applies to the clear buttons below). Click the cancel button to return to the initial screen (the same applies to the cancel button below). If a condition is input to one of the supply air ratio input area and the exhaust ratio input area, the other condition is automatically determined. After inputting the conditions in each input area, when the setting button is clicked (tapped), the controller stores the conditions input in each input area in the storage area and then displays the painting process screen on the display.

After confirming each condition or changing each condition, click the system operation button on the painting process screen. When the system operation button is clicked, the controller 26 transmits the setting output signal of the air supply fan 61 to the control unit while transmitting the ON signal to the control unit of the air supply fan 61. The control unit of the air supply fan 61 operates the air supply fan 61 at a set output while activating the air supply fan 61.

The controller 26 determines (indexes) the output of the circulation pump 52 with respect to the output (set output) of the air supply fan 61 while taking into consideration the correlation between the output of the air supply fan 61 and the output of the circulation pump 52, and the circulation pump. While transmitting the ON signal to the control unit of 52, the output signal of the circulation pump 52 is transmitted to the control unit. The control unit of the circulation pump 52 operates the circulation pump 52 with the output transmitted from the controller 26 while activating the circulation pump 52. The controller 26 transmits the set output signal of the water supply pump 84 to the control unit while transmitting the ON signal to the control unit of the water supply pump 84. The control unit of the water supply pump 84 operates the water supply pump 84 with the output transmitted from the controller 26 while activating the water supply pump 84.

The controller 26 transmits an ON signal to the room pressure sensor 29, the temperature sensor 30, and the humidity sensor 31. Upon receiving the ON signal from the controller 26, the room pressure sensor 29 starts measuring the room pressure of the painting booth 11 and transmits the measured measurement room pressure to the controller 26. Upon receiving the ON signal from the controller 26, the temperature sensor 30 starts measuring the temperature inside the painting booth 11 and transmits the measured measured temperature to the controller 26. Upon receiving the ON signal from the controller 26, the humidity sensor 31 starts measuring the humidity inside the painting booth 11 and transmits the measured humidity to the controller 26.

The controller 26 determines the opening degree of the swivel vane of the motor damper 74 corresponding to the exhaust ratio of the mixed air a4, and transmits the opening degree signal to the control unit of the motor damper 74. The control unit of the motor damper 74 adjusts the opening degree of the swivel blade of the motor damper 74 to that of the opening degree signal according to the opening degree signal. The controller 26 determines the opening degree of the swivel blade of the motor damper 75 corresponding to the supply air ratio of the mixed air a4, and transmits the opening degree signal to the control unit of the motor damper 75. The control unit of the motor damper 75 adjusts the opening degree of the swivel blade of the motor damper 75 to that of the opening degree signal according to the opening degree signal.

In the painting process, the air supply fan 61 forcibly supplies the mixed air a4 to the painting booth 11 from the ceiling 21 of the painting booth 11. The worker uses the painting equipment in the painting booth 11 to apply the oil-based paint or the water-based paint to the painted surface of the automobile 35. During the painting work in the painting booth 11, volatile organic compounds (VOCs) contained in the oil-based paint are scattered, and the coating mist of the oil-based paint or the water-based paint is scattered, and these harmful substances are mixed in the mixed air a4. .. As shown by the arrow L1 in FIG. 14, the exhaust air a1 (mixed air a4) containing harmful substances flows into the recovery duct 33 under the floor 32 through the air recovery port provided on the floor 22, and the recovery duct 33. It flows through the lower part 34 of the housing 28.

When the circulation pump 52 is started, the fluidized paraffin 38 is forcibly circulated by the circulation pump 52 (supply means 39), and the fluidized paraffin 38 is supplied to the collection element 36 from the first supply port 56 of the supply container 51. The liquid paraffin 38 is supplied to the honeycomb laminated element 37 from the second supply port 57 of the supply container 51. The fluid paraffin 38 is an abbreviation for an upper end portion 41 extending between both side portions 44 of the rearmost filter 40 (collection element 36) located rearward in the air flow direction (rear in the thickness direction) of the collection element 36. It is supplied to the whole area.

The fluid paraffin 38 infiltrates from substantially the entire area of the upper end 41 of the rearmost filter 40 (collecting element 36) toward the filter 40 (collecting element 36) located in front of the air flow direction (front in the thickness direction). While doing so, as shown by arrows L5 in FIGS. 15 and 16, the collection element 36 (these filters 40) flows from the upper end portion 41 toward the central portion 42, and flows from the central portion 42 toward the lower end portion 43. do. The entire area of the collection element 36 (the entire area of those filters 40) is kept wet by the fluidized paraffin 38. The fluid paraffin 38 that has passed through the collection element 36 flows downward (drops) from the lower end portion 43 of the collection element 36, and is stored (recovered) in the storage container 49.

Further, the fluid paraffin 38 is supplied to substantially the entire area of the upper end portion 45 extending between the side portions 48 of the honeycomb laminated element 37. As shown by the arrow L5 in FIG. 17, the fluid paraffin 38 flows from substantially the entire upper end portion 45 of the honeycomb laminated element 37 toward the central portion 46, and also flows from the central portion 46 toward the lower end portion 47. .. The entire area of the honeycomb laminated element 37 is kept wet by the fluid paraffin 38. The fluid paraffin 38 that has passed through the honeycomb laminated element 37 flows downward (drops) from the lower end portion 47 of the honeycomb laminated element 37, and is stored (recovered) in the storage container 49.

The exhaust air a1 that has flowed into the lower portion 34 of the housing 28 through the recovery duct 33 passes through the entire area of the collection element 36 that is in a wet state by the fluidized paraffin 38 in the thickness direction thereof. When the exhaust air a1 passes through the collection element 36, the volatile organic compounds among the harmful substances contained in the exhaust air a1 are dissolved (dissolved) in the fluid paraffin 38, and the coating mist among the harmful substances is released. Adhering (adsorbing) to the fluid paraffin 38, harmful substances are collected by the fluid paraffin 38, and as shown by the arrow L2 in FIG. 14, clean return air a2 is generated.

Even if harmful substances remain in the return air a2 that has passed through the collection element 36, the return air a2 passes through the honeycomb laminated element 37 that is moistened by the fluidized paraffin 38. When the return air a2 containing a harmful substance passes through the honeycomb laminated element 37, the volatile organic compound among the harmful substances contained in the return air a2 dissolves (dissolves) in the fluid paraffin 38, and the harmful substance. Of these, the coating mist adheres (adsorbs) to the fluid paraffin 38, and harmful substances are collected by the fluid paraffin 38. When the return air a2 passes through the honeycomb laminated element 37, as shown by the arrow L2 in FIG. 14, clean return air a2 from which harmful substances have been removed is generated.

The coating system 10 allows the exhaust air a1 to pass through the collection element 36, which is moistened by the fluid paraffin 38, dissolves the volatile organic compounds among the harmful substances in the fluid paraffin 38, and causes the harmful substances to be dissolved. By adhering (adsorbing) the coating mist to the fluid paraffin 38, volatile organic compounds and coating mist can be collected on the fluid paraffin 38, which is generated when the oil-based paint or the water-based paint is applied to the automobile 35. Volatile organic compounds and harmful substances of paint mist can be removed from the exhaust air a1. The coating system 10 can generate clean return air a2 from which volatile organic compounds and coating mist have been removed from the exhaust air a1, and the outside air a3 is mixed with the return air a2 from which harmful substances have been removed from the exhaust air a1. The mixed air a4 can be supplied to the painting booth 11.

The coating system 10 was installed on the downstream side of the collection element 36 even if volatile organic compounds and harmful substances of the coating mist passed through the collection element 36 and the harmful substances remained in the return air a2. Since the harmful substances remaining in the fluid paraffin 38 flowing in the entire area of the honeycomb laminated element 37 can be collected, the harmful substances can be removed from the return air a2 in which the harmful substances remain by using the honeycomb laminated element 37. It can be removed, and clean return air a2 can be generated by removing volatile organic compounds and coating mist from the exhaust air a1.

The flow speed of the exhaust air a1 in the collection element 36 gradually slows down due to the air resistance of the collection element 36 (filter 40), and the exhaust air in the collection element 36 (filter 40) located in front of the air flow direction. The flow speed of a1 is high, and the flow speed of the exhaust air a1 in the collection element 36 (filter 40) located behind the air flow direction is slow, but the flow speed of the exhaust air a1 is slow, but behind the air flow direction of the collection element 36. The fluid paraffin 38 is supplied to substantially the entire area of the upper end 41 of the rearmost filter 40 (collecting element 36), and the fluid paraffin 38 is located forward from the rearmost filter 40 in the air flow direction. Assuming that the flow rate of the fluid paraffin 38 in the filter 40 located in front of the air flow direction becomes slower and the exhaust air a1 quickly flows through the filter 40 located in front of the air flow direction. In addition, the contact time of the exhaust air a1 with the molecules of the fluid paraffin 38 can be lengthened, harmful substances contained in the exhaust air a1 can be reliably collected by the fluid paraffin 38, and the collection element 36 can be collected. It can be used to reliably remove harmful substances contained in the exhaust air a1.

The fluid paraffin 38, which collects harmful substances contained in the exhaust air a1 and is stored in the storage container 49, forcibly flows through the pipe line 55 by the circulation pump 52, passes through the pipe line 55, and is stored in the storage container 49. After flowing into the replenishment replacement container 50, it flows into the strainer 53 (filtering device) through the pipeline 55. In the strainer 53, harmful substances collected in the liquid paraffin 38 are filtered. The fluid paraffin 38 whose harmful substances have been filtered by the strainer 53 flows into the supply container 51 through the conduit 55 and is supplied again from the supply container 51 to the collection element 36 and the upper ends 41 and 45 of the honeycomb laminated element 37. Will be done.

In the coating system 10, volatile organic compounds collected (dissolved) in the fluid paraffin 38 and harmful substances of the coating mist are filtered (removed) by the strainer 53 (filtering device), and the fluid paraffin 38 is saturated with the harmful substances. Since the clean fluid paraffin 38 from which harmful substances have been filtered is supplied again to the collection element 36 and the honeycomb laminated element 37 by the circulation pump 52, harmful substances of volatile organic compounds and coating mist are filtered. Hazardous substances contained in the exhaust air a1 can be reliably collected by utilizing the clean fluid paraffin 38, and the harmful substances can be reliably removed from the exhaust air a1.

The coating system 10 causes the fluidized paraffin 38 to flow from the upper ends 41, 45 of the collection element 36 and the honeycomb laminated element 37 toward the lower ends 43, 47, thereby removing volatile organic compounds and harmful substances of the coating mist. The clean fluid paraffin 38 can keep the collection element 36 and the honeycomb laminated element 37 in a wet state while constantly supplying the filtered clean fluid paraffin 38 to the collection element 36 and the honeycomb laminated element 37. , Harmful substances contained in the exhaust air a1 are reliably collected by using the clean fluid paraffin 38 flowing from the upper ends 41 and 45 of the collecting element 36 and the honeycomb laminated element 37 toward the lower ends 43 and 47. Can be made to.

The return air a2 from which harmful substances have been removed by the collection element 36 and the honeycomb laminated element 37 flows through the entire area of the humidifying element 73 in a wet state by the water 85 supplied by the water supply means 76 in the thickness direction. When the return air a2 passes through the humidifying element 73, the water 85 that has infiltrated into the humidifying element 73 is vaporized, and the returned air a2 is humidified by the vaporized water 85 (water vapor). The coating system 10 can increase the humidity of the return air a2 by allowing the return air a2 to flow through the humidifying element 73 which is moistened by the water 85.

The opening degree of the swivel vane of the motor damper 75 installed inside the outside air duct 59 is the opening degree of the opening degree signal transmitted from the controller 26, and the outside air a3 passes through the first air filter unit 62. As shown by the arrow L3 in FIG. 14, a predetermined ratio of outside air a3 flows into the central portion 70 (air supply fan 61) of the housing 28 through the air flow path of the motor damper 75. When the outside air a3 passes through the first air filter unit 62, dust and fine particles contained in the outside air a3 are collected by the first air filter unit 62. In the central portion 70 (air supply fan 61) of the housing 28, harmful substances are removed by the collecting element 36 and the honeycomb laminated element 37, and the clean return air a2 and the motor damper 75 humidified by the humidifying element 73 pass through. The outside air a3 is mixed with the outside air a3 to generate the mixed air a4.

The mixed air a4 flows into the first air supply duct 65 from the air supply fan 61. The opening degree of the swivel vane of the motor damper 74 installed in the first air supply duct 65 is the opening degree of the opening degree signal transmitted from the controller 26, and the mixed air a4 at a predetermined ratio is the air of the motor damper 74. A predetermined ratio of mixed air a4 flows into the inside of the second air supply duct 66 from the air supply port 71 while being exhausted to the outside from the exhaust port 72 (galley) through the flow path.

As shown by the arrow L4 in FIG. 14, the mixed air a4 passes through the third air filter unit 64 and is supplied from the ceiling 21 of the painting booth 11 to the inside of the painting booth 11. When the mixed air a4 passes through the second and third air filter units 63 and 64, dust and fine particles contained in the mixed air a4 are collected by the second and third air filter units 63 and 64. Since the painting system 10 removes dust and fine particles contained in the outside air a3 and the mixed air a4 by using the air filter units 62 to 64, the mixed air a4 from which the dust and fine particles have been removed is exhausted to the outside. The mixed air a4 from which dust and fine particles have been removed can be supplied to the painting booth 11, and the painting work can be performed in a comfortable environment filled with the mixed air a4 from which dust and fine particles have been removed. ..

A predetermined ratio of the mixed air a4 is exhausted to the outside by the motor damper 74 (displacement adjusting means), and the mixed air a4 having a larger ratio than the mixed air a4 exhausted to the outside is discharged from the ceiling 21 of the painting booth 11 to the inside of the painting booth 11. Is supplied with air. The ratio of the mixed air a4 exhausted to the outside is in the range of 5 to 40% when the entire mixed air a4 is 100%, and the ratio of the mixed air a4 supplied to the painting booth 11 is mixed. When the whole air a4 is 100%, it is in the range of 60 to 95%.

The room pressure sensor 29 transmits the measured room pressure of the painting booth 11 to the controller 26. The controller 26 compares the measurement chamber pressure of the painting booth 11 transmitted from the chamber pressure sensor 29 with the preset chamber pressure of the painting booth 11. The controller 26 transmits an output adjustment signal to the control unit of the air supply fan 61 so that the measurement chamber pressure falls within the set chamber pressure, and the motor damper 74 (displacement adjustment means) and the motor damper 75 (supply air). An opening signal (opening holding signal or opening change signal) is transmitted to the control unit of the amount adjusting means). The control unit of the motor damper 74 and the motor damper 75 adjusts the opening degree of the swivel blade according to the opening degree signal transmitted from the controller 26. The room pressure of the painting booth 11 is maintained at a positive pressure by the motor damper 74 (displacement adjusting means) and the motor damper 75 (air supply adjusting means).

When the room pressure of the painting booth 11 becomes negative, the exhaust air a1 containing harmful substances flows back from the recovery mechanism 12 to the painting booth 11, contaminating the painting booth 11 and generating clean return air a2. However, in the painting system 10, the room pressure of the painting booth 11 is maintained at a positive pressure, so that the exhaust air a1 is surely recovered by the recovery mechanism 12 and the exhaust air a1 flows into the collection mechanism 13. The clean mixed air a4 (return air a2) from which harmful substances have been removed can be supplied to the painting booth 11.

When the output of the air supply fan 61 increases during the adjustment of the chamber pressure and the flow rate of the mixed air a4 (exhaust air a1) flowing into the painting booth 11 increases, the controller 26 sends the control unit of the circulation pump 52 accordingly. Send an output increase signal. The control unit of the circulation pump 52 increases the output of the circulation pump 52 and increases the supply amount of the fluidized paraffin 38 supplied to the collection element 36 and the honeycomb laminated element 37 (supply amount adjusting means). When the output of the air supply fan 61 decreases during the adjustment of the chamber pressure and the flow rate of the mixed air a4 (exhaust air a1) flowing into the painting booth 11 decreases, the controller 26 sends the control unit of the circulation pump 52 accordingly. Send an output reduction signal. The control unit of the circulation pump 52 reduces the output of the circulation pump 52, and reduces the supply amount of the fluidized paraffin 38 supplied to the collection element 36 and the honeycomb laminated element 37 (supply amount adjusting means).

The coating system 10 supplies the amount of fluid paraffin 38 supplied to the collection element 36 and the honeycomb laminated element 37 as the amount of air supplied to the mixed air a4 (exhaust air a1) supplied to the coating booth 11 increases. By increasing the amount, the required amount of clean fluid paraffin 38 from which harmful substances have been filtered can be supplied to the collection element 36 and the honeycomb laminated element 37, while preventing the saturation of harmful substances in the fluid paraffin 38. Volatile organic compounds and harmful substances of coating mist contained in the exhaust air a1 can be reliably collected in the fluid paraffin 38, and return air a2 from which the harmful substances have been removed can be generated.

The coating system 10 reduces the supply amount of the fluid paraffin 38 supplied to the collection element 36 and the honeycomb laminated element 37 as the supply amount of the mixed air a4 supplied to the coating booth 11 decreases. It is possible to prevent an excessive supply of the fluid paraffin 38, suppress the power consumption of the circulation pump 52, and save energy in the coating system 10.

The temperature sensor 30 transmits the measured temperature of the coating booth 11 to the controller 26. The controller 26 compares the measured temperature of the painting booth 11 transmitted from the temperature sensor 30 with the preset temperature of the painting booth 11, and if the measured temperature is lower than the set temperature, the measured temperature is in the range of the set temperature. An output adjustment signal is transmitted to the control unit of the circulation pump 52 and the control unit of the heater (heating means) so as to enter inside. The control unit of the circulation pump 52 and the control unit of the heater adjust the output of the circulation pump 52 and the heater according to the output adjustment signal transmitted from the controller 26.

When the measured temperature is higher than the set temperature, the controller 26 transmits an output adjustment signal to the control unit of the circulation pump 52 and the control unit of the chiller 88 so that the measured temperature falls within the range of the set temperature. The control unit of the circulation pump 52 and the control unit of the chiller 88 adjust the output of the circulation pump 52 and the chiller 88 according to the output adjustment signal transmitted from the controller 26. The painting system 10 can create a good temperature environment in the painting booth 11 by adjusting the temperature inside the painting booth 11 with a circulation pump 52, a heater (heating means), and a chiller 88, and paints in a comfortable environment. You can do the work.

When the measured temperature measured by the temperature sensor 30 is lower than the preset set temperature, the coating system 10 raises the temperature of the fluid paraffin 38 by a pressurizing means or a heating means (heater), and the collection element 36 The temperature of the air flowing through the honeycomb laminated element 37 is raised by the fluidized paraffin 38 heated to a predetermined temperature, thereby raising the temperature inside the painting booth 11, thereby accelerating the drying of the paint. , The efficiency of painting work can be improved.

In the coating system 10, the temperature of the fluid paraffin 38 rises by pressurizing the fluid paraffin 38 by a pressurizing means or heating the fluid paraffin 38 by a heating means (heater), and the fluidity thereof is good. At the same time, the function of collecting harmful substances of the fluid paraffin 38 is improved, and the volatile organic compounds contained in the exhaust air a1 and the harmful substances of the coating mist can be reliably collected in the fluid paraffin 38.

As the temperature of the fluid paraffin 38 rises, the coating system 10 facilitates filtration of volatile organic compounds and harmful substances of coating mist contained in the fluid paraffin 38 by the strainer 53 (filtration device), and the strainer 53 (filtering device) The fluid paraffin 38 containing harmful substances can be regenerated into the clean fluid paraffin 38 from which the harmful substances have been filtered (removed) by using a filtration device), and the clean fluid paraffin 38 from which the harmful substances have been filtered can be regenerated. It is possible to reliably collect (remove) harmful substances contained in the exhaust air a1 by utilizing the above.

The humidity sensor 31 transmits the measured humidity of the painting booth 11 to the controller 26. The controller 26 compares the measured humidity of the painting booth 11 transmitted from the humidity sensor 31 with the preset humidity of the painting booth 11, and if the measured humidity is higher than the set humidity, the measured humidity is in the set humidity range. An output adjustment signal is transmitted to the control unit of the water supply pump 84 and the control unit of the chiller 88 so as to enter the inside. The control unit of the water supply pump 84 and the control unit of the chiller 88 adjust the output of the water supply pump 84 and the chiller 88 according to the output adjustment signal transmitted from the controller 26.

When the measured humidity is lower than the set humidity, the controller 26 transmits an output adjustment signal (water supply increase signal) to the control unit of the water supply pump 84. The control unit of the water supply pump 84 adjusts the output of the water supply pump 84 according to the output adjustment signal transmitted from the controller 26. When the measured temperature is within the set temperature range and the measured humidity is lower than the set humidity, the chiller 88 is operated at a low output, and the water vapor vaporized from the humidifying element 73 adheres to the fins of the heat exchanger 89. The water vapor adhering to the fins of the heat exchanger 89 is vaporized to humidify the return air passing through the heat exchanger 89. The painting system 10 can create a good humidity environment in the painting booth 11 by adjusting the humidity inside the painting booth 11 with a water supply pump 84 or a chiller 88, and can perform painting work in a comfortable environment. ..

In the painting system 10, when the water-based paint is applied to the automobile 35 (object to be painted) in the painting booth 11, if the humidity inside the painting booth 11 is high, the drying of the water-based paint is delayed, but it is measured by the humidity sensor 31. When the measured humidity is higher than the preset humidity, the water-based paint can be dried faster by lowering the humidity inside the painting booth 11 with the water supply pump 84 or the chiller 88 (cooling / dehumidifying means). , The efficiency of painting work can be improved.

When the water-based paint is applied to the automobile 35 (object to be painted) in the painting booth 11, if the humidity inside the painting booth 11 is lower than necessary, the water-based paint dries early and the automobile 35 is painted. Although the leveling of the surface is lowered, by humidifying the return air a2 by vaporizing the water 85 that has infiltrated into the humidifying element 73, it is possible to prevent the water-based paint from drying early, and the leveling of the painted surface of the automobile 35 is lowered. It is possible to prevent the increase of coating defects.

The painting system 10 can take in fresh outside air a3 (air) inside the painting booth 11 by exhausting a predetermined ratio of mixed air a4 to the outside, and the concentration of carbon dioxide in the painting booth 11 increases. The painting work can be performed in a good environment that does not harm the health of the worker. The painting system 10 generates the return air a2 from which the harmful substances are removed from the exhaust air a1, so that even if the mixed air a4 containing the return air a2 is exhausted to the outside, the air is not polluted and the environment is maintained. Contamination can be prevented.

The painting system 10 can supply the mixed air a4 containing the return air a2 from which the harmful substances are removed from the exhaust air a1 to the painting booth 11, and is generated in the painting process of the paint on the automobile 35 (painted object). Exhaust air a1 containing volatile organic compounds and harmful substances of paint mist flows into the recovery duct 33 under the floor 32 and flows into the collection mechanism 13 through the recovery duct 33 under the floor 32, and thus contains harmful substances. However, the exhaust air a1 does not fill the inside of the painting booth 11, and the possibility that the worker working in the painting booth 11 inhales volatile organic compounds and painting mist can be reduced, and the health of the worker can be improved. Painting work can be performed in a good environment that does not harm.

FIG. 20 is a side view of the coating system 10 showing the inside of the coating booth 11 in the drying process. In FIG. 20, the flows of the warm air a5, the exhaust warm air a6, and the return air warm air a7 are indicated by arrows L1 to L3. After applying the paint to the automobile 35 (object to be coated) by the painting step, a drying step of drying the paint applied to the automobile 35 is carried out. When performing the drying process, click (tap) the drying process selection button on the initial screen (menu screen). When the drying process selection button is clicked (tapped), the drying process screen (not shown) is displayed on the display or touch panel.

A condition display area, a condition input button, a system operation button, and an OFF button are displayed on the drying process screen. In the condition display area, a target temperature display area displaying the target temperature of the painting booth 11, an operation mode display area displaying the operation mode (circulation operation or warm-up operation), and an operation time display area displaying the operation time are displayed. .. To enter or change each condition, click the condition input button on the drying process screen. When you click the condition input button, the condition input screen (not shown) is displayed on the display.

On the condition input screen, a target temperature input area, an operation mode selection area, an operation time input area, a setting button, a clear button, and a cancel button are displayed. Enter the target temperature in the target temperature input area, select a predetermined operation mode (circulation operation or warm-up operation) from the operation mode selection area (assuming that circulation operation is selected), and operate time in the operation time input area. When the setting button is clicked (tapped) after inputting, the controller 26 stores the conditions input in each input area in the storage area, and then displays the drying process screen on the display.

After confirming each condition or changing each condition, click the system operation button on the painting process screen. When the system operation button is clicked, the controller 26 transmits the set thermal power signal of the gas burner 18 to the control unit while transmitting the ON signal to the control unit of the gas burner 18 (heating means). The control unit of the gas burner 18 operates the gas burner 18 with the set thermal power while activating the gas burner 18. The controller 26 transmits an ON signal to the control unit of the air supply fan 61. The control unit of the air supply fan 61 operates the air supply fan 61 at a normal output while activating the air supply fan 61. The normal output of the air supply fan 61 is lower than the output of the air supply fan 61 in the painting process.

The controller 26 transmits an ON signal to the control unit of the circulation pump 52. The control unit of the circulation pump 52 operates the circulation pump 52 at a normal output while activating the circulation pump 52. The normal output of the circulation pump 52 is lower than the output of the circulation pump 52 in the painting process. The controller 26 transmits an ON signal to the temperature sensor 30. Upon receiving the ON signal from the controller 26, the temperature sensor 30 starts measuring the temperature inside the painting booth 11 and transmits the measured measured temperature to the controller 26. When the circulation pump 52 is activated, the liquid paraffin 38 is supplied from the supply container to the collection element 36 and the honeycomb laminated element 37.

In the circulation operation of the drying step, the painting booth 11 is supplied with warm air a5 produced by the gas burner 18 as shown by an arrow L1 in FIG. The warm air a5 supplied from the gas burner 18 dries the paint applied to the automobile 35. As shown by the arrow L2 in FIG. 20, the exhaust warm air a6 after the paint is dried flows into the recovery duct 33 under the floor 32 through the air recovery port provided on the floor 22, and passes through the recovery duct 33. It flows into the lower part 34 (collection mechanism 13) of the housing 28. The exhaust warm air a6 flowing into the collection mechanism 13 through the collection duct 33 is passed through the entire area of the collection element 36, which is in a wet state by the fluid paraffin 38, in the thickness direction thereof, and then is in a wet state by the fluid paraffin 38. The entire area of the honeycomb laminated element 37 in the above is passed in the thickness direction thereof.

When the exhaust warm air a6 passes through the collection element 36 and the honeycomb laminated element 37, the volatile organic compounds among the harmful substances contained in the exhaust warm air a6 are dissolved (dissolved) in the fluid paraffin 38, and the harmful substances are dissolved. Our coating mist adheres (adsorbs) to the fluid paraffin 38, and harmful substances are collected by the fluid paraffin 38. As shown by the arrow L3 in FIG. 20, the return air warm air a7 in which the harmful substances are collected is supplied to the painting booth 11 from the ceiling 21 of the painting booth 11 by the air supply fan 61.

When warm-up operation is selected in the operation mode selection area and the system operation button is clicked, the controller 26 sends an ON signal to the control unit of the gas burner 18 (heating means), and the set thermal power signal of the gas burner 18 is transmitted. To the control unit. The control unit of the gas burner 18 operates the gas burner 18 with the set thermal power while activating the gas burner 18. In the warm air operation, the warm air a1 created by the gas burner 18 is supplied to the inside of the painting booth 11, but the air supply fan 61 and the circulation pump 52 are not operated. Therefore, in the warm-up operation, the warm-up a1 stays inside the painting booth 11.

In the drying step, circulation operation and warm-up operation are performed within the input operation time, and the paint applied to the automobile 35 (painted object) is dried. In the drying process, the temperature sensor 30 transmits the measured temperature of the coating booth 11 to the controller 26. The controller 26 compares the measured temperature of the painting booth 11 transmitted from the temperature sensor 30 with the preset target temperature of the painting booth 11, and controls the gas burner 18 so that the measured temperature is within the range of the target temperature. Send a thermal power adjustment signal to the unit. The control unit of the gas burner 18 adjusts the thermal power of the gas burner 18 (increases the thermal power, decreases the thermal power). When the operation time of the drying step is completed, the gas burner 18, the air supply fan 61, the circulation pump 52, and the temperature sensor 30 are stopped.

When the paint applied to the automobile 35 (object to be coated) is dried in the drying step, the coating system 10 raises the temperature inside the coating booth 11 to a predetermined temperature (target temperature) by the gas burner 18 (heating means). Since the air supply mechanism 14 supplies the warm air a5 (return air warm air a7) in which harmful substances are collected by the collection mechanism 13 to the painting booth 11 while blocking the inflow of outside air, the high temperature return air warm air a7 By circulating or retaining the paint, the paint applied to the automobile 35 can be quickly dried, and the efficiency of the painting work can be improved.

10 Painting system 11 Painting booth 12 Collection mechanism 13 Collection mechanism 14 Air supply mechanism 15 Humidification mechanism 16 Cooling / dehumidification mechanism 17 Heating mechanism 18 Heating mechanism (gas burner)
19 Panel 20 Both side walls 21 Ceiling 22 Floor 23 Rear wall 24 Door 25 Doorway 26 Controller 27 Lighting equipment 28 Housing 29 Room pressure sensor 30 Temperature sensor 31 Humidity sensor 32 Underfloor 33 Recovery duct 34 Lower 35 Automobile (painted object)
36 Collection element 37 Honeycomb laminated element 38 Fluid paraffin 39 Supply means 40 Filter 41 Upper end 42 Central 43 Lower end 44 Both sides 45 Upper end 46 Central 47 Lower end 48 Both sides 49 Storage container (drain pan)
50 Replenishment replacement container 51 Supply container 52 Circulation pump 53 Strainer (filtration device)
54 Storage box 55 Pipe line 56 1st supply port 57 2nd supply port 51 Pipe line 58 Air supply duct 59 Outside air duct 60 Exhaust duct 61 Supply air fan 62 1st air filter unit 63 2nd air filter unit 64 3rd air filter Unit 65 1st air supply duct 66 2nd air supply duct 67 Upper 68 Connection port 69 Outside air intake 70 Central part 71 Air supply port 72 Exhaust port 73 Humidification element 74 Motor damper (exhaust volume adjusting means)
75 Motor damper (means for adjusting air supply)
76 Water supply means 77 Filter 78 One end 79 Central 80 Other end 81 Both sides 82 Receiving panel 83 Water supply container 84 Water supply pump 85 Water 86 Water supply port 87 Pipeline 88 Chiller 89 Heat exchanger 90 Pipeline a1 Exhaust air a2 Return air Air a3 Outside air a4 Mixed air a5 Warm air a6 Exhaust warm air a7 Return air Warm air

Claims (11)

A painting booth of a predetermined volume for applying paint to the object to be coated, and exhaust air containing a harmful substance consisting of at least volatile organic compounds of volatile organic compounds and coating mist generated in the coating process of the paint on the object to be coated. The outside air is applied to the recovery mechanism collected from the painting booth, the collection mechanism for collecting the harmful substances from the exhaust air collected by the recovery mechanism, and the return air in which the harmful substances are collected by the collection mechanism. An air supply mechanism for supplying the mixed air to the painting booth, a humidifying element having a predetermined thickness and a predetermined area and extending in the horizontal direction, and a humidifying mechanism having a water supply means for supplying water to the humidifying element. Equipped with
The collection mechanism has a predetermined thickness and a predetermined area and extends in the vertical direction, and the fluid paraffin supplied to the collection element to keep the entire collection element in a wet state, and the flow. Including a supply means for supplying sex paraffin to the collection element.
In the collection mechanism, the exhaust air is passed through the collection element in a wet state by the fluid paraffin supplied by the supply means, and the harmful substances contained in the exhaust air are infiltrated into the collection element. Collected in liquid paraffin,
In the humidifying mechanism, the humidifying element is installed on the downstream side of the collecting element, and the return air is passed through the humidifying element which is in a moist state by the water supplied by the water supply means, and penetrates into the humidifying element. A painting system characterized in that the returned air is humidified by vaporizing the water. The supply means is located above the collection element to supply the fluidized paraffin to the upper end of the collection element, and is located below the collection element and flows out of the collection element. A container for accommodating the fluid paraffin, a circulation pump for inflowing the fluid paraffin contained in the container into the supply container, and a filtering device for filtering harmful substances collected in the fluid paraffin. In the supply means, the fluid paraffin is circulated from the storage container to the supply container by using the circulation pump, and the fluid paraffin is circulated from the upper end portion to the lower end portion of the collection element. The coating system according to claim 1, which is made to flow. The supply means increases the supply amount of the fluidized paraffin supplied to the collection element as the supply amount of the mixed air supplied to the coating booth increases, and the mixed air supplied to the coating booth is increased. The coating system according to claim 1 or 2, wherein the amount of fluid paraffin supplied to the collection element is reduced as the amount of air supply is reduced. When the coating system includes a humidity sensor for measuring the humidity inside the coating booth and the water supply means has a measured humidity measured by the humidity sensor lower than a preset set humidity, the humidifying element is used. The coating according to any one of claims 1 to 3, wherein the amount of water to be supplied is increased, and when the measured humidity is higher than the set humidity, the amount of water supplied to the humidifying element is reduced or stopped. system. The coating system includes a temperature sensor that measures the temperature inside the coating booth, and a cooling / dehumidifying mechanism that lowers the temperature inside the coating booth and lowers the humidity inside the coating booth. -In the dehumidifying mechanism, when the measured humidity measured by the humidity sensor is higher than the preset set humidity, the humidity inside the painting booth is lowered and the measured temperature measured by the temperature sensor is preset. The coating system according to claim 4, wherein when the temperature is higher than the set temperature, the temperature inside the coating booth is lowered. The coating system includes a heating mechanism that raises the temperature inside the coating booth, in which the heating mechanism determines that the measured temperature measured by the temperature sensor is lower than a preset set temperature of the coating booth. The coating system according to claim 5, which raises the internal temperature. The heating mechanism pressurizes the fluid paraffin circulating between the storage container and the supply container to raise the temperature of the fluid paraffin, and the fluidity circulating between the storage container and the supply container. The coating system according to claim 6, which is at least one of the heating means for heating the paraffin to raise the temperature of the fluid paraffin. The air supply mechanism supplies the air supply fan for forcibly supplying the mixed air, the exhaust amount adjusting means for adjusting the exhaust amount of the mixed air to the outside, and the air supply of the mixed air to the painting booth. The air supply amount adjusting means includes a supply air amount adjusting means for adjusting the amount, the exhaust amount adjusting means exhausts the mixed air in a predetermined ratio to the outside, and the air supply amount adjusting means is larger than the mixed air exhausted to the outside. The coating system according to any one of claims 1 to 7, wherein a ratio of the mixed air is supplied from the ceiling of the coating booth toward the floor surface of the coating booth. The coating system according to any one of claims 1 to 8, wherein the recovery mechanism causes the exhaust air to flow under the floor of the painting booth, and the exhaust air flows into the collection mechanism from under the floor. In the painting system, the painting step of applying the paint to the object to be painted and the drying step of drying the paint applied to the object to be painted by the painting step are carried out, and in the painting step, the air supply is performed. While the mechanism takes in the outside air, the mixed air in which the outside air is mixed with the return air from which the harmful substances are collected by the collection mechanism is supplied to the coating booth, and in the drying step, the temperature raising means is used. The claim that the temperature inside the painting booth is raised to a drying temperature, and the return air warm air in which harmful substances are collected by the collecting mechanism is supplied to the painting booth while the air supply mechanism blocks the inflow of outside air. The coating system according to any one of 1 to 9. The air supply mechanism is installed at the intake port of the outside air to collect dust and fine particles contained in the outside air, and is installed at the exhaust port of the mixed air to collect the dust and fine particles contained in the mixed air. The coating system according to any one of claims 1 to 10, further comprising an air filter that collects air filters and an air filter that is installed on the ceiling of the coating booth and collects dust and fine particles contained in the mixed air.

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