JPH03217264A - Coating booth - Google Patents

Abstract

PURPOSE:To reduce installation cost by firstly allowing the introduced outside air to flow to the peripheral zone through a first air conditioner and recovering this air and allowing it to flow to a working zone through a second air conditioner and discharging the air recovered from the working zone to the outer part. CONSTITUTION:In a first air feeding chamber 3, air is blown out to the lower part from the ceiling part of a working zone A of the center part in a coating booth 1. In a second air feeding chamber 4 comparted from this chamber 3, air is blown out to the lower part from the ceiling part of the peripheral zone B equipped to the working zone A in the booth 1. Further in a first exhaust chamber 7, the air is exhausted from the floor part of the working zone A. In a second exhaust chamber 8 comparted from thin chamber 7, the air is exhausted from the floor part of the peripheral zone B. Furthermore the outside air is force-fed to a second air feeding chamber 4 through an outside air supplying route C. Further in a circulation route, the air sucked from the second exhaust chamber 8 is force-fed to the first air feeding chamber 3 through an air conditioner 16. Furthermore in an exhaust route, the air sucked from the chamber 7 is discharged to the outer part through an exhaust treating device 13.

Description

Detailed Description of the Invention (Industrial Field of Application) The present invention relates to a painting booth as a facility for painting the bodies of automobiles, for example, while continuously transporting them, and in particular, the present invention relates to a painting booth that is used as equipment for painting the bodies of automobiles while being continuously conveyed. Concerning the improvement of air conditioning systems for supply.

<Prior art> For example, as shown in Japanese Patent Application Laid-Open No. 60-190256, in this type of painting booth, air whose temperature and humidity have been adjusted by an air conditioner is supplied to the ceiling of the booth. Air is blown downward from the chamber, and air containing paint mist is exhausted from an exhaust chamber installed on the floor of the booth, creating an almost constant airflow inside the booth from the ceiling to the floor. ing.

Paint and other substances are separated in the exhaust chamber on the floor, and paint mist and organic solvents are removed by an exhaust treatment device installed in the exhaust route. There are known systems in which all of the clean air that has passed through an exhaust treatment device is exhausted to the outside, and systems in which a portion of the exhaust air is circulated through the air supply path to reduce losses such as heat.

<<Problem to be solved by the invention>> Painting booths for car bodies and the like are quite large, and the amount of air passing through them from the ceiling to the floor is also quite large. An exhaust treatment device for treating such a large amount of exhaust gas is extremely large, and equipment costs are high. In addition, even if the painting booth is large, there are various accessories attached to the painting equipment, so the object to be painted (such as the body of a car) will actually pass through it.
The actual working space where the paint is sprayed is a part of the whole, and it is necessary to supply this part with airflow of clean, appropriate temperature and humidity, but the surrounding surrounding space is not as well-ventilated. It is not necessary to provide conditioned air. However, with conventional systems, a nearly constant airflow is generated vertically throughout the entire painting booth.
The burden on the air conditioner is correspondingly large, and the equipment cost is therefore high.

This invention was made in view of the above-mentioned conventional problems, and its purpose is to provide an air conditioning system that can reduce the cost of necessary equipment without impairing the air conditioning function for the substantial working space in a painting booth. Our goal is to provide the following.

<Means for Solving the Problems> Accordingly, the present invention provides a first air supply chamber for blowing air downward from the ceiling of a work zone at the center of a painting booth, and a first air supply chamber that is partitioned into , a second air supply chamber for blowing air downward from a ceiling portion of a peripheral zone attached to the work zone in the painting booth; a first exhaust chamber for exhausting air from the floor portion of the work zone; 1st
a second exhaust chamber that is separated from the exhaust chamber and exhausts air from the floor portion of the peripheral zone; an outside air supply path that pressure-feeds outside air to the second air supply chamber; The system was configured with a circulation path for feeding air under pressure to the first air supply chamber through an air conditioner, and an exhaust path for exhausting air sucked from the first exhaust chamber to the outside through an exhaust treatment device.

《For production》 In the system described above, air flows as follows.

Outside air is pumped into the second air supply chamber, from where it is blown towards a peripheral zone within the paint booth, and the airflow is drawn from the second exhaust chamber and passed through the air conditioner to the first air supply. pumped into the chamber. Air is blown out from there towards the working zone within the coating booth, the air flow is directed to the first exhaust chamber, and the air sucked in from the second exhaust chamber is discharged to the outside through the exhaust treatment device.

《Example》 In Figure 1, 1 indicates a painting booth, and 2 indicates booth 1.
The center of the figure shows an automobile body (object to be painted) being transported by a conveyor or the like. The paint booth 1 is considerably large compared to the dimensions of the automobile body 2, and the substantial working space for spraying paint onto the automobile body 2 is called a working zone A, and the space attached to both sides thereof is called a peripheral zone B.

The space above the ventilated ceiling of the painting booth 1 includes a first air supply chamber 3 located directly above the work zone A and two second air supply chambers 4 located directly above the peripheral zone B. An air supply duct 5 is arranged above the first air supply chamber 3 in the direction of the conveyance line, and similarly an air supply duct 6 is arranged above each second air supply chamber 4. It is set up. As will be described later, air that is forced into the air supply duct 5 is blown out from the first air supply chamber 3 toward the work zone A within the booth. Similarly, the air that is pressure-fed through the air supply duct 6 is blown out from the second air supply chamber 4 toward the peripheral zone B within the booth.

The space below the slatted floor of the painting booth 1 is divided into a first exhaust chamber 7 located directly below the work zone A and two second exhaust chambers 8 located directly below the peripheral zone B.

The first exhaust chamber 7 is led to a lowermost space 10 by a vertical pipe 9 communicating with the floor thereof, and is further connected to an exhaust duct 11. This exhaust duct 11 is connected to an exhaust fan 12 , and air in the first exhaust chamber 7 is sucked by the fan 12 , collected in the exhaust duct 11 , and further discharged to the outside through an exhaust treatment device 13 .

Further, the second exhaust chamber 8 communicates with a space 14 in its lower part, and from there with a circulation duct 15. This circulation duct 15 includes a second air conditioner 16, a supply air fan 17, and the first
It is connected to a circulation path that connects the air supply duct 5 above the air supply chamber 3.

In addition, there is also an air supply fan 19 for introducing outside air.
The first air conditioner is connected to the population side, and the outlet side is connected to the air supply duct 6 above the second air supply chamber, which is the outside air supply route.

The pump 2 is installed on the floor of the first exhaust chamber 7 and the second exhaust chamber 8.
The water supplied from 0 flows into the underfloor space 14 of the exhaust chambers 7 and 8, and further flows into the underfloor space 10,
The water that has reached the space 10 collects in a paint separation tank 21. Paint and the like that have flowed into the water from the painting booth 1 are separated in a separation tank 21. The pump 20 sucks the water after separation from the tank 21 and supplies it to the exhaust chambers 7 and 8.

The operation of the air conditioning system configured as described above will be described below.

As the air supply fan 19 rotates, outside air is taken into the first air conditioner 18 , and the purified, heated, and humidified air is sent under pressure to the air supply duct 6 . The air sent into the air supply duct 6 passes through the second air supply chamber 4 and is blown out toward the peripheral zone B of the coating booth 1. This airflow moves from top to bottom in the peripheral zone B, flows to the second exhaust chamber 8 directly below the peripheral zone B by the suction action of the air supply fan 17, and further flows from the space 14 to the circulation duct 15 to the second air conditioner 16. →The air is fed under pressure to the air supply duct 5 through the air supply fan 17. The air sent into the air supply duct 5 is blown out from the first air supply chamber 3 toward the work zone A of the painting booth 1, forming an air flow from top to bottom that envelops the substantial painting space for the car body 2. . Due to the suction action of the exhaust fan 12, this flow flows into the first exhaust chamber 7 directly below the work zone 8, and further, the vertical pipe 9→space 10→exhaust duct 11→exhaust fan 1
2- Exhaust treatment device 13 and then released to the outside. The exhaust treatment device 13 removes organic solvents and the like contained in the exhaust gas.

The first air conditioner 18 and the second air conditioner 16 are equipped with a heater, a washer, an iris, a humidifying tube, etc., and purify the air, as well as appropriately heat and humidify the air. Note that since air once heated by the first air conditioner 18 flows into the second air conditioner 16, the heater capacity may be smaller than that of the first air conditioner 18.

In the above system, if the total air volume flowing from top to bottom in the painting booth 1 is 100, the air volume exhausted to the outside by the exhaust fan 12 is 50, and the remaining 50
will be circulated. Therefore, the exhaust treatment device 13 may be one that can treat half of the amount of air flowing inside the booth. In addition, the work zone A includes a first air conditioner 18 and a second air conditioner 16.
Since the air that has passed through both the first air conditioner 18 (highly conditioned air) is passed through, and the air that has only passed through the first air conditioner 18 is sent to the peripheral zone B, highly conditioned air is sent throughout. The air conditioning capacity is lower than that of the

Note that the first air conditioner 18 in this embodiment is not an essential requirement of the present invention.

<<Effects of the Invention>> As explained in detail above, the paint booth air conditioning system according to the present invention divides the inside of the paint booth into a work zone that requires highly conditioned air and a surrounding zone that requires highly conditioned air. The outside air is first passed through the first air conditioner to the surrounding zone, the air is recovered and passed through the second air conditioner to the work zone, and the air recovered from the work zone is discharged to the outside through the exhaust treatment device. The amount of air that needs to be treated by the exhaust treatment device is very small compared to the amount of air flowing inside the booth, which reduces equipment costs. In addition, since highly conditioned air is supplied only to the work zone, the overall air conditioning capacity can be reduced, resulting in lower equipment costs.

[Brief explanation of drawings]

FIG. 1 is a schematic diagram of an air conditioning system for a paint booth according to an embodiment of the present invention. 1...Painting booth B...Peripheral zone 2...Car body 3...First air supply chamber 5...Air supply duct 7 ...First exhaust chamber 11...Exhaust duct 13...Exhaust treatment device A...Work zone (object to be painted) 4... Second air supply chamber 6...Air supply duct 8...Second exhaust chamber 12...Exhaust fan 15...Circulation duct 17...・Air supply fan 19...Air supply fatnon 16...Second air conditioner 18...First air conditioner

Claims (1)

[Claims] A first air supply chamber for blowing air downward from the ceiling of a central work zone in the painting booth; and a peripheral zone that is separated from the first air supply chamber and is attached to the work zone in the paint booth. a second air supply chamber for blowing air downward from the ceiling of the work zone; a first exhaust chamber for exhausting air from the floor of the work zone; and a floor of the peripheral zone that is separated from the first exhaust chamber. a second exhaust chamber for exhausting air from the section; an outside air supply path for forcing outside air to the second air supply chamber; and a force-feeding air sucked from the second exhaust chamber to the first air supply chamber through an air conditioner. An air conditioning system for a painting booth, comprising a circulation path and an exhaust path for exhausting air sucked from the first exhaust chamber to the outside through an exhaust treatment device.