JPS6024466Y2 - Split exhaust painting booth - Google Patents

Description

[Detailed Description of the Invention] The present invention relates to a divided exhaust type paint booth that can efficiently collect unapplied paint.

During spray painting, a mist of unapplied paint is generated in the painting booth, and if left unaddressed, the mist will adhere to the object being painted, impairing the finished appearance, and also having a negative impact on the health of workers. It is necessary to promptly remove such substances.

Therefore, in general, a painting booth is provided with an air supply chamber 3 in the upper part of the painting chamber 2 and a paint mist separation chamber 4 in the lower part of the painting chamber, as shown in Fig. 1. A paint mist separation device 5 is provided in the center, and by bringing the mist-containing air flow into contact with the water flow in this separation device, the mist contained in the air can be separated.

Such a paint booth is designed so that the temperature, humidity, and wind speed of the air flowing from the top to the bottom in the painting room 2 are appropriate.

However, the recovery efficiency of unapplied paint in the painting room 2 depends on the exhaust volume of the painting room, but in the case of a conventional painting booth,
Since it is not possible to change the partial supply/exhaust volume within the booth, that is, zone control of supply/exhaust, the entire booth is supplied with air and the entire exhaust is exhausted.

However, in the conventional general exhaust system, the air near the object to be painted that contains a lot of paint mist and the air around the periphery where there is little paint mist are treated together under the same conditions by one device. , a large amount of energy is likely to be wasted in the paint mist separation section.

In other words, when separating paint mist from the exhaust gas of a paint booth using a cleaning liquid, it is necessary to increase the gas-liquid contact efficiency.
To remove a certain amount of paint mist, a certain amount of cleaning fluid and pressure loss are required, so the larger the amount of air during gas-liquid contact, the greater the amount of cleaning fluid and pressure loss required.

Therefore, in order to process all the air at once in one path, a very large pressure loss will occur for all the air in the separation chamber, and in order to obtain sufficient separation performance with this device, it is necessary to operate the exhaust fan. There was a problem that large power loss occurred.

Another drawback is that a large amount of cleaning liquid is required for one separation device.

The present invention is intended to solve such problems, and provides a paint booth having a structure that can reduce energy consumption required for separating paint mist.

The split exhaust type paint booth of the present invention divides the paint mist separation chamber into at least two parts using a partition plate: a central part through which air with a large amount of paint mist flows and a peripheral part through which air with relatively little paint mist flows; Each of the divided sections is connected to an exhaust means such as an exhaust fan, and the flow rate of the cleaning liquid flowing down at each section is changed according to the amount of paint mist in the air flowing through each section, and further, In the present invention, when draining the cleaning liquid, it is more advantageous to configure flow plates, tanks, etc. in multiple stages, and reuse the cleaning liquid used to separate the paint mist in the first part in sequence in the second and third parts. It is.

The present invention will be explained in more detail below with reference to the drawings.

FIG. 2 is a schematic cross-sectional view showing an example of the coating booth of the present invention. As shown in the figure, the coating booth 1 includes a coating chamber 2, an air supply chamber 3, a paint mist separation chamber 4, and an air supply chamber 3. an exhaust fan 7a for exhausting air containing different paint mist from the paint mist separation chamber 4;
It consists of 7b and 7c.

The paint mist separation chamber 4 is divided into a central portion 9 and peripheral portions 10a, 10b in the flow direction of exhaust gas by partition plates 8a, 8b.

The air in the central part 9 is exhausted by the connected exhaust fan 7a, and the air in the peripheral parts 10a and 10b is exhausted by the exhaust fan 7b.
, 7c, respectively.

Furthermore, a paint mist separation device 5 provided in the separation chamber 4 is connected to a tank lla containing cleaning liquid on both sides of the upper part of the separation chamber 4.
, a flow plate 12a that allows the washing liquid to flow out from the llb.
, 12b, and in this example, the flow plate is composed of two members: another flow plate 13a, 13b having a different slope on its upstream side, that is, as shown in the figure, the flow plate 13a on the upstream side ,
13b is formed at a slight angle with respect to the flow plates 12a and 12b, respectively.

A venturi 19 for mist separation is formed between the flow plates 12a and 12b, and a venturi 19 is formed between the flow plates 12a and 12b.
, 13a and 12b, 13b have a slight gap between them to form mist separating parts 14a, 14b which are capable of making gas-liquid contact with the air in the peripheral part 10.

Therefore, depending on the angle of inclination of the flow plate, the flow of the cleaning liquid is slow in the central part 9 and faster in the peripheral part 10.

In the painting booth 1 having such a configuration, air whose temperature and humidity have been adjusted in advance to a predetermined temperature and humidity by an air conditioner is sent into the air supply chamber 3 by the air supply fan 6, and further into the painting chamber via the filter 15. 2.

This air is used in the painting room 2 to remove the paint mist that has been scattered by the paint guns 16a and 16b without adhering to the object 17 to be painted.
8 to the paint mist separation chamber 4 below.

At this time, the air near the object to be painted 17 at the central part in the direction of movement of the object to be painted passes through the inner side separated by the partition plates 8a and 8b, that is, the central part 9, and passes through the paint mist separation device 5. The paint mist comes into contact with the cleaning liquid in the venturi 19 and is separated from the air.

The air from which the paint mist has been separated is discharged outdoors from the exhaust fan 7a.

The air in the side part of the painting room 2 away from the object 17 is directed to the outside separated by the partition plates 8a and 8b, that is, to the peripheral part 1.
0, paint mist contained in the air is separated at paint mist separating sections 14a and 14b between flow plates 12 and 13, and is discharged from exhaust fans 7b and 7c.

Here, the cleaning liquid for separating paint mist from the air is supplied to tanks lla and llb by a pump (not shown), passes through flow plates 13a and 13b, and is first transferred to paint mist separating sections 14a and 14b into the painting room. It also comes into contact with the air in the center of the painting chamber 2 at the venturi 19 through the flow plates 12a and 12b.

That is, the cleaning liquid contacts the air in the peripheral part 10 where the amount of paint mist is small at a high flow rate, and contacts the air in the center part 9 where the amount of paint mist is large at a low flow rate.

In this way, the air in the paint booth is divided into three directions into those with a large amount of paint mist and those with a small amount of paint mist, and are treated and discharged respectively.

Therefore, unlike the conventional method, the entire air is not treated with one separation device, but is divided and treated according to the amount of paint mist in each, so the pressure loss required to treat the entire air can be greatly reduced.

For example, in order to reduce the concentration of paint mist in the air discharged from the exhaust fan 7a to 5 mg/- or less when painting with the conventional painting booth shown in FIG.
80-1007rr for total air in 9! nH2
This results in a pressure loss of O.

However, according to the present invention, each exhaust fan 7a, 7b, 7c
In order to reduce the concentration of paint mist in the air discharged from the venturi 19 to 5 m9/- or less, a pressure loss of 80 to 100 wnH,0 is generated for the air treated by the venturi 19, but Periphery 10 processed in 14b
It is only necessary to operate with a pressure loss of 30 to 40 rrvnH20 for the air of 100 ml of air, and the pressure loss for the air in the entire painting booth is greatly reduced, and the power loss of exhaust fan operation can be reduced by about 40%.

In addition, in order to obtain the same separation performance in this way, conventionally a large amount of cleaning liquid was required for the entire air at once, but according to the present invention, each air The amount of cleaning liquid that is appropriate for the amount of cleaning liquid that flows into the venturi 19 is the separation part 14a.

14b, the amount of cleaning liquid required for the total amount of air may be smaller than in the past.

For example, compared to the case where the water-air ratio (water amount/air amount) is set to 2 to 2.5 in the venturi 19 using a conventional painting booth, the present invention can obtain the same separation performance, and the separating section 14a, 14b and Venturi 19,
When the water-air ratio is set to 2 to 2.5, the amount of cleaning liquid required for the total amount of air may be 50% or less of the conventional amount.

As described above, according to the present invention, since air containing a large amount of paint mist and air containing a small amount of paint mist are separated and processed separately, the pressure loss in the paint mist separation chamber relative to the total air is much smaller than before, and the power loss is reduced. It can be reduced to a large extent.

Moreover, the amount of cleaning liquid can be reduced without changing the water-air ratio for separating paint mist, and the same separation performance as conventional methods can be obtained.

In other words, according to the present invention, it is possible to obtain paint mist separation performance equivalent to or better than conventional methods with lower energy consumption.
The industrial value of the present invention is extremely large.

[Brief explanation of drawings]

FIG. 1 is a schematic cross-sectional view of a conventional painting booth, and FIG. 2 is a schematic cross-sectional view of a split exhaust paint booth of the present invention.

Claims (1)

[Scope of utility model registration request] The paint mist separation room of the paint booth is divided into at least two parts by a partition plate, a central part through which a large amount of air flows, and a peripheral part through which air with relatively little paint mist flows, and each of these divided parts is used as an exhaust means. A divided exhaust type paint booth that is connected and is characterized in that the flow rate of the cleaning liquid flowing down at each section is changed according to the amount of paint mist in the air flowing through each section.