JP2012000543A - Heated or cooled, humidified air box - Google Patents

Abstract

PROBLEM TO BE SOLVED: To secure the quality of a painted surface by preventing excessive drying of a water paint by raising humidity in a booth during spray painting, and improve working environment by leveling temperature during spray work as much as possible irrespective of seasons, in the existing sealed painting booth where a worker enters to spray paint.SOLUTION: Outside air sucked from an outside air intake port 32 by the suction of sirocco fans 15, 25 provided in the painting booth 1 is air-conditioned by humidifiers 33a, 33b, 33c provided in a cabinet 31 and heat exchangers 34a, 34b for heating or cooling. A heated or cooled, humidified air box 3 supplying the conditioned air from the connection part 36 provided in a discharge passage 35 to a suction port 21 of the painting booth 1 is provided separately from the existing painting booth 1 so as to be easily added on by use of the connection part 36, which achieves cooling or heating during the work in the painting booth 1 while securing the humidity suitable for the spray painting of the water paint, and enables the disposal of contaminated air after the painting.

Description

  The present invention is attached to a sealed painting booth provided with a device for supplying sucked outside air to the inside of the painting booth.

  When repairing scratches or dents in an automobile body at an automobile maintenance shop, etc., it is common to spray liquid paint on the finish, but organic solvent-based paints contain organic solvent components that are undesirable for the human body. As a result of spray coating, the organic solvent gas contained in the paint evaporates and surplus paint mist floats. For this reason, taking into consideration the exhaust of the organic solvent gas to be evaporated and the prevention of external scattering of the paint mist, the outside air is sucked and supplied into the painting booth during the spray coating, and floats together with the organic solvent gas. After the excess paint mist is filtered through a filter, a sealed type painting booth that exhausts the dirty air to the outside air side has come to be used. In such a painting booth, each time a colored base paint or finished clear paint is sprayed, the sprayed surface is irradiated with an infrared lamp and baked, and then sprayed and baked several times. In order to dry the coated surface with hot air, the outside air sucked was heated to a predetermined temperature and then supplied into the coating booth.

  The painting booth shown in Patent Document 1 as such a sealing type painting booth is a painting booth provided with a hot air generation device and an exhaust device, provided with a cold air generation device, and this cold air generation device includes a refrigerator and a blower, We provide a painting booth that can quickly cool down after drying the painted surface. Since this painting booth according to Patent Document 1 can incorporate a refrigerator having sufficient cooling capacity from the design stage of the painting booth, it is possible to cool the automobile body that has been dried with the hot air in a short time. It is easy to become.

  On the other hand, the painting booth according to Patent Document 2 is a painting method performed on a painting line for painting a member constituting an automobile body by a flow operation, and in an intermediate coating process of painting a member with a water-based paint, By applying humidification, a coating method that can suppress the coating failure of the member by adjusting the drying time of the water-based paint, reduce the energy consumed in the painting line, and reduce the space required for the construction of the painting line. providing. According to this Patent Document 2, as an example, the floor is sprinkled and humidified, and it can be seen that it is intended for a large-scale paint booth that does not involve the work in the booth of the paint worker.

Both of these two prior arts relate to a painting booth that can quickly cool after finishing the drying of the painted surface, and to humidification in the painting booth in a continuous painting line. Recently, socially sought to reduce the use of volatile organic compounds, which is generally referred to as VOC countermeasures in consideration of the environment, and the water-based paint with a low organic solvent content is also used in automobile repair shops. An expansion trend is seen.

However, in recent years, a small-scale sealed painting booth equipped in a general automobile maintenance factory, etc. has several spray paintings inside and one baking by an infrared lamp. Repeatedly, followed by supplying hot air to dry the painted surface, sucking outside air to cool, cooling to another car, spray painting and baking, hot air drying, cooling are repeated in time series, Although the equipment is equipped with hot air generating means such as boilers and fans for the purpose of drying the sprayed paint surface, air conditioning means for leveling the coating booth temperature throughout the season for the purpose of working environment, Many of them do not have a humidifying means for suppressing the drying time of the water-based paint.

Japanese Patent Laid-Open No. 07-256167 Japanese Patent Publication No. 2010-036126

  In such a small-scale painting booth, the water-based paint in the cold season has a high viscosity, so that the sprayed surface tends to be too thick and the smoothness tends to be impaired. In addition, when the outside air temperature reaches around + 30 ° C in the summertime when intense heat days continue, the temperature inside the painting booth that sucks such outside air becomes higher than this, resulting in a poor working environment and transpiration inside the painting booth. There is also a risk of harming the health of workers with the organic solvent gas resulting from the paint, which is undesirable for the human body. Also, in such an environment, sweat may flow out from the workers, and the splashes may scatter when the work is performed, and if the splashes adhere to the body surface being painted, the quality of the painted surface will be significantly impaired. Also occurred frequently.

  Also, in such a painting booth that does not have a cooling device, the temperature in the painting booth tends to rise as the operating time becomes longer, and the relative humidity in the painting booth decreases as the temperature rises. Since the evaporation of water is promoted, when spraying a water-based paint, the sprayed paint is quickly dried.

  Usually, to spray a large area, it is spread while making some coatings. Here, organic solvent-based paints in which multiple types of solvents with different boiling points are used are mixed, and the relatively high boiling point organic solvent contained therein suppresses the rapid progress of polymerization due to surface drying. The organic solvent with excellent solubility, which is also included in the upper layer paint that has been repainted, also affects the lower coated surface, so the upper and lower layers are easy to fuse. For example, even if it is a metallic paint, the upper and lower layers It is easy to obtain uniform dispersion of metallic fine particles.

  In contrast, water-based paints that have almost no solvent power and are dispersed in water with the help of emulsifiers due to their low organic solvent content start drying from the surface when exposed to air with reduced humidity, and become polymerized. Advances. Therefore, it is difficult to re-dissolve with water contained in the upper paint layer applied to the lower paint layer that has been dried and polymerized from the surface. If this paint is a metallic water-based paint, it is upper and lower two layers. There is also a problem that the homogeneous dispersion of the metallic fine particles is hindered to cause darkening. Under such circumstances, the spray coating of the water-based paint requires an appropriate humidity environment in order to ensure the quality of the painted surface by repeated coating.

  Therefore, it can be retrofitted in a simple manner to an existing sealed painting booth that does not have an air conditioning / humidifying device and a humidifying device, and the air conditioning means for leveling the working temperature as much as possible throughout the seasons and the drying time of the water-based paint are suppressed. Humidification means to clean, always take in fresh outside air, cool and heat and humidify it, supply it to the painting booth, make the dirty air disposable after passing through the filter, so that dirt due to excess paint mist etc. An object of the present invention is to provide a hot and cold humidified air box that does not require reuse by circulating air.

  In order to achieve the above object, a warm and humidified air box according to claim 1 of the present invention includes an intake passage that sucks outside air from at least an intake port through an intake damper, and an air blower provided in the intake passage. Means and a heating means, a supply passage for supplying heated outside air into the coating booth, and an exhaust means for exhausting the air in the coating booth through a filter. In the existing sealed painting booth, which is connected to the supply flow path and provided with a return damper, the part of the heated outside air can be returned from the supply flow path to the intake flow path. The body was air-conditioned by a housing internally provided with air-conditioning means comprising a humidifier for spraying water on the outside air taken from the outside air inlet and humidifying it, and a heat exchanger for heating or cooling downstream thereof. Air painting booth An outflow path that flows out to the intake port, a connection means that is provided in the outflow path and is connected so as to cover the intake port of the paint booth, and the housing that extends beyond the connection means at the end of the outflow path An opening that allows the outside air to flow directly into the intake port without intervening, and by providing an opening damper and an outflow damper in the opening and the outflow path, respectively, a temperature that can be retrofitted to the coating booth is provided. It is characterized by a cold humidification flow path.

According to the configuration of the first aspect, this hot and cold humidified air box having no air blowing means is a humidifier that separates from the existing sealed paint booth and sprays water on the outside air taken in from the outside air inlet to humidify it. A housing having an air conditioning means comprising a heat exchanger and a heat exchanger for heating or cooling downstream thereof is a suction force by the blowing means and the exhaust means of the painting booth connected to the air flow path by the connecting means. The outside air can be taken in, and the taken-in outside air can be humidified by spraying water provided in the housing, and can be heated or cooled by the heat exchanger.

The humidifier and the heat exchanger are not limited to one each, and a plurality of humidifiers and heat exchangers can be provided, whereby the number of operating units can be increased or decreased to adjust the humidity and temperature in the painting booth.

Also, an outflow path for the air conditioned in this way to flow out to the inlet of the painting booth, a connection means provided in the outflow path and connected to cover the inlet of the painting booth, and the connection means An opening that allows the outside air to flow directly into the air inlet without passing through the housing is provided at the tip of the outflow passage that extends beyond the opening, and the opening damper and the outflow damper are respectively provided in the opening and the outflow passage. When the conditioned air flows out into the paint booth, the outflow damper is opened, and the opening damper is closed to form a heating / cooling humidification flow path that connects the paint booth through the outflow passage to the paint booth. On the other hand, if the opening damper is opened and the outflow damper is closed, the outside air suction flow path connecting the opening of the coating booth through the outflow path can be obtained.

The hot and cold humidified air box according to claim 2 of the present invention is the hot and cold humidified air box according to claim 1, wherein the inside of the casing is a part of the air that is folded back into a substantially U shape by erecting a partition wall halfway. A flow path is formed.

  According to the configuration of the second aspect of the present invention, the hot and cold humidified air box has an air flow path that folds back into a substantially U-shape by standing an intermediate partition wall up to the middle of the casing. The mouth can be provided in the same direction as the outflow channel extending from the opening.

  The hot and cold humidified air box according to claim 3 of the present invention is the hot and cold humidified air box according to claim 2, wherein the housing includes a reflux path and a ventilation means for reflux, and the air flowing through the outflow path is provided. A part of the air can be returned to the outside air inlet side.

  According to the configuration of claim 3, by forming the air flow path that is folded back into a substantially U shape in the housing by the configuration of claim 2, the outflow path and the outside air intake port are provided side by side in the same direction. It is possible to form a reflux path that connects a part of the outflow path and a part of the outside air intake port, and this can be provided with a ventilation means for reflux.

  The hot and cold humidified air box according to claim 4 of the present invention is the hot and cold humidified air box according to claim 1, wherein a steam generator for generating water vapor is provided downstream of the heat exchanger in the housing. It is characterized by.

According to the configuration of claim 4, the housing is provided with a steam generator that generates water vapor downstream of the heat exchanger, so that the outside air sprayed with water is humidified with water vapor after passing through the heat exchanger. It can be carried out.

The method for painting an automobile body according to claim 5 of the present invention is the painting booth using the hot and cold humidified air box according to any one of claims 1 to 4, wherein the environment in the booth during painting is preferably about + 18 ° C. 5. The method of painting an automobile body according to claim 1, wherein the humidity when spraying the water-based paint is about 50% RH to about 60% RH.

According to the structure of claim 5, in the coating booth using the hot and cold humidified air box according to any one of claims 1 to 4, the environment in the booth at the time of the painting work is preferably about + 18 ° C by the cold and humidified air box. To about + 25 ° C., and the relative humidity when spraying the water-based paint can be about 50% RH to about 60% RH.

  According to the first aspect of the present invention, this hot and cold humidified air box takes in the outside air by the suction force of the blowing means and the exhaust means of the painting booth connected to the air flow path by the connecting means, It is possible to suppress the drying of water-based paint sprayed by humidification by spraying water inside the body, and by heating or cooling with a heat exchanger, the working temperature during spray painting can be as low as possible throughout the seasons. Can be leveled. In this way, fresh air is always taken in, air-conditioned and humidified, supplied to the painting booth, and after passing through the filter, the dirty air is made disposable so that dirty air from excess paint mist etc. is circulated. There is no need to reuse it.

  The humidifier and the heat exchanger can be provided with a plurality of units as well as a single unit, whereby the humidity in the painting booth can be adjusted by increasing / decreasing the number of each operation and increasing the heat exchange efficiency. Therefore, it becomes possible to flexibly cope with a wide range of temperature fluctuations and humidity fluctuations of the outside air.

  In addition, when setting the interior of the painting booth before spray painting to a temperature suitable for the work environment, or irradiating the painting location with an infrared lamp, stop the humidifier and the exhaust means in the painting booth. By performing cooling and heating while sucking outside air, the heated or cooled air is easily trapped in the painting booth, so that it is possible to suppress the consumption of electric energy related to the exhaust means.

  According to the second aspect of the present invention, since this hot and cold humidified air box is formed with an air flow path that folds back into a substantially U-shape by erecting a partition wall up to the middle of the housing, The body can be arranged in a compact manner, and the outside air intake can be provided in the same direction as the outflow passage extending from the opening, so that outside air is sucked from one surface of the outer wall of the building that houses the painting booth. Can be incorporated.

According to the invention of claim 3, this hot and cold humidified air box has an air flow path that is folded back into a substantially U-shape in the housing by the structure of claim 2, so that the outflow provided side by side in the same direction It becomes possible to return a part of the air conditioned by the return air blowing means provided in the return path connecting a part of the path and a part of the outside air intake into the enclosure, and the temperature of the conditioned air supplied to the painting booth Stabilization can be achieved by reducing rapid fluctuations in humidity, and air conditioning efficiency and humidification efficiency can be improved.

According to the invention which concerns on Claim 4, since the steam generator which generate | occur | produces water vapor | steam downstream is provided in the said casing at the downstream of a heat exchanger, it cools by the external air sprayed with water passing a heat exchanger. Even after the humidity has changed due to the effect or the heating effect, the humidity can be finely adjusted by turning the steam generator on and off.

According to the fifth aspect of the present invention, the environment in the booth during the painting operation is preferably obtained by obtaining a cooling / heating means whose temperature can be controlled from about + 18 ° C. to about + 25 ° C., so that the viscosity of the paint increases in the cold season. Therefore, the problem that the sprayed surface tends to be too thick and the smoothness is liable to be lost is solved, and since the heat is released from the heat in summer, there is no risk of damaging the health of workers. Furthermore, it is possible to suppress the deterioration of the painted surface quality due to sweating by workers, and the relative humidity when spraying the water-based paint can be approximately 50% RH to around 60% RH. Even if it is applied continuously, the paint surface sprayed first remains in a liquid state, and the metallic fine particles can be uniformly diffused between the paint surface sprayed on the paint surface. It is possible to reduce problems such as

FIG. 1 is a diagram illustrating a method for implementing a hot and cold humidified air box according to a first embodiment of the present invention, illustrating a damper opening and closing state and a flow of air during spray booth temperature setting before spray coating and during baking. FIG. FIG. 2 is an explanatory view showing the damper open / close state and the air flow during spray painting. FIG. 3 is an explanatory diagram showing the damper open / close state and the air flow during hot air drying. FIG. 4 is an explanatory view showing the damper open / close state and the air flow when the outside air is sucked and cooled. FIG. 5 is an explanatory view showing the arrangement of the hot and cold humidified air box according to the second embodiment on the side surface of the painting booth. FIG. 6 is an explanatory diagram showing the configuration of an existing sealed painting booth.

Embodiments as the best mode for carrying out the present invention will be described below with reference to perspective perspective views shown in FIGS. Among these, in Example 1, it is the structure which has arrange | positioned the heating / cooling humidification air box 3 of this invention in the upper part of the painting booth 1, and Example 2 is the structure arrange | positioned in the side surface of the painting booth 1. FIG. By combining a small-scale existing sealed painting booth 1 with a later-installed hot / cold humidifying air box 3, appropriate humidification and heating / cooling in the painting booth 1 can be performed without requiring major modification of the painting booth 1. It was realized.

Prior to the description of the embodiment, a schematic configuration of a small-scale existing sealed painting booth 1 before the hot and cold humidifying air box 3 of the present invention is retrofitted will be described with reference to FIG. In FIG. 6, the painting booth 1 is roughly divided into three blocks. The first is an intake passage 23 for sucking outside air from an intake port 21 through an intake damper 22 and an outside air filter 24, a sirocco fan 25 as a blowing means provided in the intake passage 23, and heating. A supply means comprising a boiler 26 as a means and a supply flow path 27 for supplying heated outside air to the back of the ceiling of the painting booth 1. The intake flow path 23 and the supply flow path 27 are connected to each other. An air conditioner 2 provided with a return damper 28 there.

Secondly, a ceiling filter 11 that uniformly and uniformly descends while filtering the outside air supplied to the back of the ceiling of the painting booth 1, and a paint booth for surplus paint mist that floats by spraying on an automobile body (not shown). The booth main body part in which the underfloor filter 12 filters through the grids of the grating 13 laid on the floor in 1.

Thirdly, the air filtered by the underfloor filter 12 is configured by exhaust means for allowing the sirocco fan 15 to exhaust from the exhaust duct 16 to the outside air through the exhaust filter 14.

Thus, when spray painting is performed, the intake damper 22 is opened, the return damper 28 is closed, and the boiler 26 is stopped as shown in FIG. At this time, the outside air passes from the intake passage 21 of the intake passage 23 by the suction force of the sirocco fan 25 of the air conditioner 2, passes through the intake damper 22, the outside air filter 24, and the sirocco fan 25 from the supply passage 27 while maintaining the outside air temperature. The surplus paint mist that is supplied to the main body of the painting booth 1 and floats by spraying is filtered through the underfloor filter 12 and the exhaust filter 14 and then exhausted from the exhaust duct 16 to the outside air side by the sirocco fan 15. When this spray coating is finished, baking is performed with an infrared lamp (not shown) under the same condition.

When the painted surface after painting and baking is heated and dried, the boiler 26 operates and the intake damper 22 and the return damper 28 are opened. At this time, outside air is supplied from the intake port 21 through the intake damper 22, the outside air filter 24, the sirocco fan 25, and the boiler 26, and the heated outside air is supplied from the supply passage 27 to the main body of the painting booth 1. A part of the air is recirculated to the intake flow passage 23 through 28 and can be reheated. At this time, the sirocco fan 15 as the exhaust means is stopped, and the outside air heated by the boiler 26 is easily trapped in the painting booth 1 to increase the heating efficiency.

When drying is finished, the boiler 26 is stopped and the return damper 28 is closed. At this time, the outside air is supplied from the supply passage 27 to the main body of the painting booth 1 as it is at the outside temperature via the suction damper 21, the outside air filter 24, and the sirocco fan 25, so that the room temperature in the painting booth 1 is lowered. Can do.

Here, the hot and cold humidified air box 3 of the present invention retrofitted on the upper part of the existing paint booth 1 will be described with reference to FIGS. In FIG. 2, the hot and cold humidified air box 3 is formed with an air flow path that is folded back into a substantially U shape by erecting a partition wall 31 a up to the middle of the housing 31. A spray nozzle 33a of a humidifier that sprays and humidifies water on the outside air taken in from the outside air inlet 32, and a heat exchanger 34a that heats or cools by circulating hot water or cold water corresponding to the outside air temperature downstream thereof. Subsequently, the air-conditioning means consisting of the spray nozzle 33b and the heat exchanger 34b is installed in two stages in the same manner even after being folded back into the U-shape. A device 33c is arranged.

An outflow passage 35 that extends to the housing 31 and flows out the air-conditioned air to the inlet 21 of the painting booth 1, and is provided in the outflow passage 35 so as to cover the inlet 21 of the painting booth 1. And an opening 37 that allows the outside air to flow directly into the intake port 21 without passing through the housing 31 at a point where the outflow passage 35 extends beyond the connection portion 36. In addition, an opening damper 38 and an outflow damper 39 are disposed in the opening 37 and the outflow path 35, respectively, so that the paint booth 1 can be retrofitted.

The hot and cold humidified air box 3 includes a reflux duct 4 serving as a reflux path, a jet pump 41 serving as a ventilation fan, and a guide plate 42 that guides the flow of the refluxing air to the outside air intake 32 side. And part of the air flowing through the outflow passage 35 can be returned to the outside air inlet 32 side.

Subsequently, the drawings will be described in the order of the work process. The existing painting booth 1 shown in FIG. 1 is loaded with a car that has been repaired with scratches and dents on the body (not shown), and a preliminary stage for spraying a metallic water-based paint as a base paint to the repaired part. The temperature of the painting booth 1 is being set. At this time, the spray nozzles 33a and 33b and the steam generator 33c are stopped, the heat exchangers 34a and 34b are in operation, the outflow damper 39 is open, and the opening damper 38 is closed. Further, the intake damper 22 and the return damper 28 of the air conditioner 2 are opened, the sirocco fan 25 is operating, and the boiler 26 is stopped. On the other hand, the sirocco fan 15 which is an exhaust means from the painting booth 1 is stopped.

The outside air is taken in from the outside air inlet 32 of the hot and cold humidified air box 3 by suction by the sirocco fan 25 of the air conditioner 2 and passes through the heat exchangers 34a and 34b. The outside air heated or cooled by heat exchange reaches the outflow path 35. Here, a part of the air is returned to the reflux duct 4 by the air injection of the jet pump 41, is guided to the guide plate 42, and is again heated or cooled from the outside air inlet 32, and the other is supplied from the outflow damper 39 to the painting booth 1. To the inlet 21 of the engine.

From here, it is supplied to the ceiling of the painting booth 1 from the supply flow path 27 through the intake damper 22, the outside air filter 24, and the sirocco fan 25, and the body of the automobile carried into the painting booth 1 is also precooled together. . As a result, the air that has been conditioned by operating the sirocco fan 15 provided in the painting booth 1 is stopped in the painting booth 1. As a result, the power consumption of the sirocco fan 15 is omitted, so that energy-saving and ecological operation is possible.

In FIG. 1, in order to stabilize the room temperature in the painting booth 1 from about + 18 ° C. to about + 25 ° C. in order for the painting worker to enter the painting booth 1 and perform work from this time, the outside temperature is + 8 ° C. at this time, Heating is required, and warm water of + 25 ° C. is circulated through the heat exchangers 34a and 34b, which is generally called a chiller (not shown), and the room temperature is raised to + 18 ° C. in about 15 minutes. Incidentally, the circulating water of the chiller used in this embodiment can circulate cold water up to + 5 ° C during cooling and hot water from + 25 ° C to + 50 ° C during heating. If the cooling water needs a temperature lower than + 5 ° C. in a warm region, it is possible to use a chiller in which the cooling water is replaced with an antifreeze liquid generally called brine.

Next, the spray coating process of FIG. 2 will be described. 2 is a process in which a worker who performs spray coating on an automobile body (not shown) enters the painting booth 1 retrofitted with the warm / humidified air box 3 shown in FIG. Water is sprayed from the spray nozzles 33a and 33b, and hot water or cold water corresponding to the outside air temperature is circulated through the heat exchangers 34a and 34b as described above. Further, the steam generator 33c disposed downstream thereof also generates water vapor. The outflow damper 39 provided in the outflow path 35 is opened, and the extended opening damper 38 is closed. On the other hand, in the air conditioner 2 of the painting booth 1 connected to the hot / cold humidified air box 3, the intake damper 22 is opened, the return damper 28 is closed, the sirocco fan 25 is operating, but the boiler 26 is stopped. is doing. At this time, the sirocco fan 15 as the exhaust means is also operating.

Thus, the outside air is taken in from the outside air inlet 32 by the suction force of the sirocco fan 25 of the air conditioner 2 of the painting booth 1 and the sirocco fan 15 of the exhaust means, and is humidified by the spray nozzles 33a, 33b and the heat exchangers 34a, 34b. Heated or cooled, the humidity is finally adjusted by the steam generator 33 c and reaches the outflow path 35. Here, a part of the air is recirculated to the recirculation duct 4 by the air injection of the jet pump 41, and is guided by the guide plate 42 to the humidification and heating or cooling again from the outside air intake port 32. Guided to the inlet 21 of the painting booth 1.

From here, the air is supplied from the supply flow path 27 to the ceiling of the painting booth 1 through the intake damper 22, the outside air filter 24, and the sirocco fan 25, and uniformly descends while being filtered by the ceiling filter 11. Excess paint mist that diffuses and floats by spraying is filtered by the underfloor filter 12 and the exhaust filter 14 and then exhausted from the exhaust duct 16 to the outside by the sirocco fan 15. As a result, fresh air is always taken in, air-conditioned and humidified, supplied into the painting booth 1, and after passing through the filters 12 and 14, the dirty air is made disposable, so that the dirty air due to excess paint mist etc. There is no need to recycle and reuse.

By the way, a retrofit humidity sensor (not shown) is installed in the painting booth 1, and when the relative humidity exceeds 60% RH, the humidified water supply is shut off by the electromagnetic valve, and when the humidity falls below 55% RH Automatic humidification control and manual ON-OFF are also possible so that water supply can be resumed.

The internal dimensions of the painting booth 1 in this embodiment are 4.59 meters × 7.23 meters × 2.55 meters, which is approximately 84.6 cubic meters, and the air flow rate is approximately 300 cubic meters to 400 cubic meters per minute. In the above-mentioned painting process, Table 1 shows that one day at 10:00 am, the preparation stage for spraying the metallic water-based paint, which is the base paint, has started, and the outside air temperature is + 8 ° C. and the humidity is 67% RH. Therefore, heating by the heat exchangers 34a and 34b of the coating booth 1 and the hot and cold humidified air box 3 was started. Incidentally, warm water of + 25 ° C. is circulated in the heat exchangers 34a and 34b. At 10:15, the room temperature in the painting booth 1 rose by 9 ° C. to + 18 ° C., and the humidity dropped to 33% RH.

Even after 30 minutes, stability was confirmed at + 18 ° C. and 32% RH, so the spray nozzle 33a of the humidifier was operated manually. As a result, the humidity increased to + 17 ° C. and 44% RH at 11:00 after 15 minutes, and stabilized at + 17 ° C. and 46% RH at 11:30. At this time, the spray nozzle 33b was also manually operated. As a result, after 15 minutes, the humidity increased to + 17 ° C. and 57% RH and became stable, so the painting operation was started. At 12:15, the steam generator 33c was also added and humidified. As a result, it was stabilized at + 18 ° C., which is generally suitable for the work environment, and in the range of 57% RH to 61% RH, which is generally suitable for spraying water-based paints. As a result, the water-based paint in the cold season has a high viscosity, so the sprayed surface tends to be too thick, and the problem of smoothness being easily lost is solved by obtaining an appropriate heating and humidification environment. I was able to.

Table 2 shows actual measurement data on another day. At 12:00, the outside air temperature was + 30 ° C. and the humidity was 30% RH. Therefore, the heat exchangers 34a and 34b of the painting booth 1 and the hot and cold humidified air box 3 were used. Activated air conditioning. Cold water at + 5 ° C. is circulated in the heat exchangers 34a and 34b. At 12:15, the room temperature dropped to + 22 ° C. and the humidity rose to 46% RH. Fifteen minutes later, + 20 ° C. and 51% RH, which are values that generally satisfy the spray condition of the water-based paint, and the painting work was started. When the spray nozzle 33a is operated at 13:00, it is stable from + 18 ° C. to + 19 ° C. and from 58% RH to 62% RH, and at 14:00, the spray nozzle 33b is additionally operated, but from + 18 ° C., 62% RH to 63 % RH and values suitable for painting were maintained. As a result of adding the steam generator 33c at 15:00 when the outside air temperature decreased, + 17 ° C., 68% RH to 70% RH, a slight temperature decreasing tendency and a high humidity tendency were confirmed. In this case, it is not necessary to operate the steam generator 33c, and it is preferable and easy to keep the steam generator 33c at a stage where an appropriate temperature and humidity are obtained.

Despite the initial outside temperature of + 30 ° C, 15 minutes later, the interior of the painting booth 1 was lowered to + 22 ° C, and 15 minutes later, the worker was able to lower it to + 20 ° C. The spray painting can be performed comfortably. As a result, sweat does not flow out due to heat, and the problem that the splash of splashed sweat adheres to the surface of the body being painted and significantly deteriorates the quality of the painted surface is solved as a result of a moderate cooling environment. In addition, problems such as dryness progressing from the surface due to a decrease in humidity and darkening of the coating portion of the metallic water-based paint can be solved because an appropriate humidity environment was obtained.

Next, returning to FIG. 1, the baking process of the painted surface will be described. After spray painting according to FIG. 2, in order to irradiate an infrared lamp (not shown) to the above-mentioned spray painting portion, the coating worker enters the painting booth 1 again and attempts to set the position of the infrared lamp. In order to stabilize the room temperature in the painting booth 1 from about + 18 ° C. to about + 25 ° C., the return damper 28 of the air conditioner 2 is opened and the boiler 26 and the sirocco fan 15 of the exhaust means are stopped. Thereby, the outside air is taken in from the outside air inlet 32 of the hot and cold humidified air box 3 by the sirocco fan 25 of the air conditioner 2, passes through the heat exchangers 34a and 34b, and the outside air heated or cooled by heat exchange is It reaches the outflow channel 35.

Here, a part of the air is returned to the reflux duct 4 by the air injection of the jet pump 41, is guided to the guide plate 42, and is again heated or cooled from the outside air inlet 32, and the other is supplied from the outflow damper 39 to the painting booth 1. To the inlet 21 of the engine. From here, the air is supplied to the ceiling of the painting booth 1 from the supply flow path 27 via the intake damper 22, the outside air filter 24, and the sirocco fan 25, and the body of the automobile painted in the painting booth 1 is also precooled together. . As a result, the outside air conditioned by the heat exchangers 34a and 34b is supplied into the painting booth 1 while the sirocco fan 15 of the exhaust means provided in the painting booth 1 is stopped. It can be made to stutter. As a result, the power consumption of the sirocco fan 15 is reduced, and energy saving and ecological operation is possible.

In the baking process, moisture is released from the casing 31, the outflow passage 35 inside the air conditioner 2, the ceiling filter 11, and the like that are moistened by humidification during spray coating, so that an appropriate humidity is maintained. Thereby, it is suppressed that the dust which floats by generation | occurrence | production of the static electricity by excessive drying, etc. adheres to a coating location. Further, the baking performed in the painting booth 1 irradiates the infrared ray lamp on the painting portion and also blows a jet blow (not shown) to promote drying. When this baking process is completed, spray coating and baking are repeated several times, and then a clear paint as a finish paint is sprayed and baking is repeated approximately twice.

This clear paint uses an organic solvent-based paint, and humidification is not necessary in this spray painting, but since it enters the painting booth 1 and performs the spraying work, the air conditioning function of the hot and cold humidified air box 3 is provided. Since it is used, it is in an appropriate temperature environment, and dirty air containing an organic solvent that is not desirable for the human body that is evaporated by the spraying of the clear paint passes through the filters 12 and 14 together with the surplus paint mist that floats, and is disposable. It is good for the health of workers.

When spraying and baking of clear paint is completed, the process proceeds to the drying process. This drying process will be described with reference to FIG. Since the hot and cold humidified air box 3 does not include the boiler 26, the opening damper 38 of the opening 37 is opened and the outflow damper 39 is closed so as to suck the outside air into the air inlet 21 of the air conditioner 2 at the shortest distance. . For this reason, it is not connected as a flow path with the housing 31 side of the hot and cold humidified air box 3. On the other hand, the intake damper 22 and the return damper 28 in the painting booth 1 are opened and the sirocco fan 25 and the boiler 26 are operating, but the sirocco fan 15 as the exhaust means is stopped.

Thereby, the outside air sucked from the opening 37 through the opening damper 38 is approximately +60 from the supply passage 27 to the painting booth 1 main body through the intake port 21, the intake damper 22, the outside air filter 24, the sirocco fan 25, and the boiler 26. Although the outside air heated to 0 ° C. is supplied, a part thereof is returned to the intake passage 23 through the opened return damper 28 to be reheatable. At this time, the sirocco fan 15 as the exhaust means is stopped as described above, and the outside air heated by the boiler 26 is easily trapped in the painting booth 1 to increase the heating efficiency.

In the drying process, hot air heated to approximately + 60 ° C. by the boiler 26 is supplied into the painting booth 1 so that the various filters 11, 12, 14 and the walls containing moisture by humidification in the painting process are good. Since it is dried, the occurrence of mold and corrosion in the painting booth 1 body can be suppressed.

When the drying process is finished, the inside of the painting booth 1 shown in FIG. 4 needs to be cooled. Although the flow of outside air is similar to the above-described drying process, the return damper 28 is closed and the boiler 26 is not operating. As a result, outside air sucked from the opening 37 through the opening damper 38 is directly supplied from the supply passage 27 to the painting booth 1 main body through the intake port 21, the intake damper 22, the outside air filter 24, and the sirocco fan 25. The

Thus, the existing painting booth 1 retrofitted with the hot / cold humidified air box 3 according to the embodiment 1 can supply the outside air appropriately humidified and heated or cooled into the painting booth 1, and the dirty air is After passing through the filters 12 and 14, exhausting to the outside air has been realized, so that the workers can enter the painting booth 1 regardless of whether they are water-based paints or organic solvent-based paints. Therefore, the safety of the work in the painting booth 1 can be improved.

In addition, the body of an automobile sprayed with a metallic water-based paint is likely to lose its smoothness due to the tendency of the coated surface to become too thick in the cold season, and the splash of sweat that has flowed out from workers in the summer is scattered. As a result, the problem that the quality of the painted surface was significantly impaired, and the problem of darkening of the coating layer due to a decrease in humidity, etc. were solved, and the filters 12 and 14 could not be filtered due to circulation and reuse of dirty air. By preventing the generation of static electricity by humidification without increasing the amount of surplus paint mist that floats, coating defects due to adhesion of floating dust and the like could be prevented.

By retrofitting such a hot and cold humidified air box 3, the existing painting booth 1 can be a painting booth 1 suitable for spray coating of water-based paint, but the original function of the existing painting booth 1 is not impaired at all. Therefore, in spray coating of the clear paint using organic solvent-based paint, it is possible to stop the humidification function of the heating / cooling humidification air box 3 and perform spray coating without any trouble by using the cooling / heating function. In addition, it was possible to realize a comfortable working environment suitable for the work in the painting booth 1 such as spraying work.

Example 2 is the structure which has arrange | positioned the warm-and-cool humidification air box 3 of this invention in the side surface of the painting booth 1, The outline | summary is demonstrated with FIG. The warm / humidified humid air box 3 by this arrangement is disposed on the side of the painting booth 1 with the outside air inlet 32 and the reflux duct 4 of the warm / humidified air box 3 in Example 1 facing upward. The outflow portion 35 of the box 3 extends toward the intake port 21 and is provided with a connecting portion 36, an outflow damper 39, an opening 37, and an open damper 38 that are connected to the intake port 21, respectively. Although the arrangement form is different, it has the same function and is effective when the installation space is limited.

By combining the post-installed hot / cold humidification air box 3 provided with the connection portion 36 according to the present invention on the upper side or side surface of the small-scale existing sealed painting booth 1 according to the first and second embodiments, it can be roughly done in one minute. In the painting booth 1 that sucks a large amount of outside air from 300 cubic meters to 400 cubic meters, an air conditioning function in which an appropriate temperature in the painting booth 1 is about + 18 ° C. to about + 25 ° C. without requiring a major modification, The humidity when spraying the water-based paint has a humidifying function of about 50% RH to about 60% RH.

As a result, it can be retrofitted in a simple manner to an existing painting booth 1 that is not equipped with a cooling / heating device and a humidifying device, a sufficient cooling / heating function for leveling the working temperature as much as possible throughout the seasons, and the drying time of the water-based paint With a humidifying function to suppress the air, it always takes fresh fresh air, supplies air to the painting booth 1 by cooling and heating and humidifying, and the air after painting passes through the filters 11 and 14 and becomes dirty air By making the air-conditioner disposable, it is possible to provide the hot and cold humidified air box 3 that does not need to circulate and reuse air contaminated with excess paint mist.

As mentioned above, although the present Example was explained in full detail, this invention is not limited to the said Example, A various deformation | transformation implementation is possible within the range of the summary of this invention. For example, the existing painting booth 1 is not limited to those already installed. If the painting booth 1 to be introduced and installed does not have an air-conditioning and humidification function, the heating / cooling humidification of the present invention is performed together with the installation. The air box 3 may be prepared and installed. Further, even in the painting booth 1 provided with the intake port 21 having a different structure but having a similar function, the connection portion 36 is adapted to the painting booth 1 so that the connection portion 36 is connected to the different intake port 21. It is sufficient if the humidified, air-conditioned outside air can be supplied from 36, and it may be selected in a timely manner in consideration of ease of use.

  The present invention relates to a painting booth for spraying a liquid paint.

DESCRIPTION OF SYMBOLS 1 Painting booth 2 Air conditioner 3 Warm / humidified air box 4 Reflux duct 11 Ceiling filter 12 Floor filter 15 Sirocco fan 16 Exhaust duct 21 Intake port 22 Intake damper 23 Intake passage 25 Sirocco fan 26 Boiler 27 Supply passage 28 Return damper 31 Housing 31a Partition wall 32 Outside air inlet 33a Spray nozzle 33b Spray nozzle 33c Steam generator 34a Heat exchanger 34b Heat exchanger 35 Outflow path 36 Connection portion 37 Opening 38 Opening damper 39 Outflow damper 41 Jet pump

Claims (5)

Supply comprising at least an intake passage for sucking outside air from an intake port through an intake damper, a blowing means and a heating means provided in the intake passage, and a supply passage for supplying the heated outside air into the painting booth Means, and exhaust means for exhausting the air in the coating booth through a filter, connecting the intake passage and the supply passage, and providing a return damper there, and a part of the heated outside air In the existing sealed painting booth that can return from the supply flow path to the intake flow path, a humidifier that sprays water on the outside air taken in from the outside air inlet and humidifies it separately, and downstream A heat exchanger that heats or cools, a housing having air-conditioning means, an outflow passage through which air-conditioned air flows out to the intake port of the painting booth, and an outflow passage provided in the outflow passage to Connect to cover the air inlet And an opening that allows the outside air to flow directly into the air inlet without passing through the housing at the tip of the outflow passage extending beyond the connecting means. A heating / cooling humidifying air box characterized in that an opening damper and an outflow damper are provided in each of the roads to form a heating / cooling humidifying channel that can be retrofitted to the coating booth. 2. The hot and cold humidified air box according to claim 1, wherein an air flow path that turns back into a substantially U-shape is formed by erecting a partition wall halfway through the casing. 3. The hot and cold humidified air according to claim 2, wherein the housing includes a reflux path and a reflux air blowing means, and a part of the air flowing through the outflow path can be returned to the outside air intake side. box. The hot and cold humidified air box according to claim 1, wherein a steam generator that generates water vapor is provided downstream of the heat exchanger. In the painting booth using the hot and cold humidified air box, the environment in the booth during painting is preferably a temperature of about + 18 ° C. to + 25 ° C., and the humidity when spraying water-based paint is about 50% RH to 60%. 5. The method of painting an automobile body according to claim 1, wherein the method is before and after RH.