JPH0157626B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an air purification device containing paint mist for a paint booth.

In order to prevent excess paint mist floating in the air as a result of overspray in a spray painting booth from adhering to the booth surface and, in particular, from deteriorating the work atmosphere, the following measures are taken.

A clean air suction section will be formed on the ceiling side of the booth.

The floor is a grating floor, and a duct (exhaust plenum) with a blower is installed to suck air containing paint mist from below and exhaust clean air after removing paint mist to the atmosphere.

By bringing paint mist-containing air into contact with purification water on the upstream side of the blower and below the grating floor, the paint mist in the air is collected in the purification water, thereby converting it into clean air.

The water that collects paint mist (sludge) is led to a separation tank, where it is clarified and circulated using a pump.

Conventionally, the most effective method for bringing the paint mist-containing air into contact with purifying water is a hybrid method, as shown in Figure 1, which combines a target method and a direction change method. be. In this figure, A is air containing paint mist, W is water for purification, 1 is a target plate, 2 is a next-stage target plate, and 3 is a deflection plate following it. At the beginning, A' is relatively clean air and swirls steadily.
This is surrounded by the interface B of the paint mist-containing air A, the tray 4, the connecting plate 5, and the next stage target plate 2.

Therefore, the downstream end 6 of the target plate 1 in the previous stage
Nearby, part A'' with a high concentration of paint mist particles mixes into the surrounding clean air A' and tends to be difficult to separate.Then, the paint mist is separated and the relatively clean air returns to the paint mist concentration. Since the paint mist is discharged to the outside through water and air with high levels of water and air, it becomes contaminated again and the paint mist separation efficiency is poor.

The present invention aims to solve this problem.

The paint mist-containing air purification device for a paint booth according to the present invention supplies the paint mist-containing air in the same direction as the flow direction of the purifying water, and has a diversion surface (hereinafter referred to as the front stage) for the mixed flow of the paint mist-containing air and the purifying water. (referred to as the turning surface), almost all of the purifying water that is close to the downstream end of this front-stage turning surface and away from the downstream end of this front-stage turning surface, and a part of the paint mist-containing air (a high-concentration part of paint mist). ) and a next-stage turning surface with its upstream end facing the position where it captures the water, forming a series of purification channels.

The effect of this will be described with reference to FIG. 2, which is a diagram showing the principle of construction.

Almost all of the purification water w away from the downstream end 8 of the front stage turning surface 7 (hatched)
w' is captured by the next stage deflection surface 9 from its upstream end 10.

[Represented by a group of thin lines] Part of the mist-containing air a (portion with high concentration of paint mist) air a ₁
is similarly captured by the next-stage deflection surface 9.

The remaining air _a2 that has not been captured escapes without being restrained, and does not interfere with the flow of water w and air a from above.
This air _a2 is relatively clean air in which almost no paint mist particles (indicated by dots) are mixed.

As can be seen from these facts, (a) there is no possibility that a high concentration of paint mist particles will accumulate in the transfer section from the previous stage to the next stage, as in the conventional case. In other words, paint mist particles are effectively separated.

(b) The water/air ratio in the next stage is greater than that in the previous stage, and a high rate of separation of paint mist particles is performed.

(c) Since the air containing paint mist and the purifying water flow both downward and in the same direction,
There is little ventilation resistance, a relatively small fan can be used, and paint mist adhering to water is efficiently collected in the drain groove at the bottom and can be easily discharged.

Together, the above factors made it possible to significantly improve separation efficiency.

Preferred embodiments of the present invention will be described below.

[] First example. Figures 3 and 4.

11 is a painting booth, 12 is a wall, 13 is a grating floor, 14 is an object to be painted such as an automobile body, 15 is a trolley, 16 is a purification water supply header, and 17 is a washing slope that slopes gently downward toward the outlet ( tray), 18 is a series of long partition plates,
20 is a long and short opening; 21 is a series of long target plates provided below the opening 20;
It is symmetrical, with both ends sloping upward. The left and right upper surfaces of the target plate 21 are the front-stage direction changing surfaces 7, 7, respectively. A series of arcuate and elongated trough-shaped deflection plates 22, 22, whose upstream ends 10, 10 are facing near the upper side of each downstream end 8, 8 of both deflection surfaces 7, 7, are aligned with each other. It is installed in a symmetrical position. The inner surfaces of the deflection plates 22, 22 are the deflection surfaces 9, 9 of the next stage. Reference numeral 23 denotes a vertically oriented target plate, which is shared by both the deflection plates 22, 22. 24 is a diagonal bottom plate, 25 is a drainage groove, and 26 is a duct leading to an exhaust plenum.

[] Second example. Figure 5.

This is the case where both the front-stage deflection surface 7 and the next-stage deflection surface 9 are arc-shaped.

[] Other applied transformations.

Figure 6. Both the front-stage deflection surface 7 and the next-stage deflection surface 9 are flat.

Figure 7. The front-stage deflection surface 7 is arc-shaped, and the next-stage deflection surface 9 is flat.

Figure 8. A plurality of pairs (two or more) of the front-stage deflection surface 7 and the next-stage deflection surface 9 are formed along the flow direction. The figure shows two sets. Regarding this plurality of sets, it does not matter whether the direction changing surfaces 7 and 9 are arcuate or planar.

Note that in this document, the term "arc shape" includes not only a true circular arc shape but also an elliptical shape or a similar arc shape, and a shape in which each of these arc shapes has a large number of tangent groups connected. In addition, the term "planar" includes not only one plane, but also one in which one end or both ends of one plane are gently sloped, and anything similar thereto. Moreover, when referring to an arcuate shape, the circumferential length is arbitrary, but a longer one is preferable. In particular, a perfect circular arc shape with a central angle (approximately) of 180 degrees and both ends located above and below the center of curvature (Figures 4, 5, and 8)
(see figures, etc.) is preferred.

Figure 9. Instead of a gutter shape, it should be an independent ring shape. That is, a common introduction passage for water w and air a is created with a cylinder 27, and a flat plate 28 is placed below it.
A drum-shaped cylindrical body 29 that surrounds the entire circumference is used as the front-stage turning surface 7, and a drum-shaped cylinder 29 surrounding the entire circumference is used as the next-stage turning surface 9.
It is said that It is good to arrange a number of such devices in parallel, or it is good to provide only one with a large diameter.

In either case, it is desirable that the deflection surfaces 7 and 9 be coated with Teflon or another substance that prevents paint particles from adhering.

[Brief explanation of drawings]

FIG. 1 is a sectional view of a conventional example, FIG. 2 is a diagram of the construction principle of the present invention, FIGS. 3 to 9 illustrate embodiments of the present invention, and FIG. Figures 4 to 8 are longitudinal sectional views of main parts of different examples, and Figure 9 is a vertical sectional view of the main part of another example.
The figure is a cutaway perspective view of an applied example. 7... (first stage) turning surface, 8... downstream end, 9...
Next stage turning surface, 10...Upstream end, A...Air containing paint mist, W...Water for purification.

Claims (1)

[Scope of Claims] 1. Air A containing paint mist is supplied in the same direction as the flowing direction of water for purification W, and a direction changing surface 7 for the mixed flow of the air A containing paint mist and water W for purification, and this direction changing surface 7. close to the downstream end 8 of and this deflection surface 7
A series of purification systems is provided with a next-stage deflection surface 9 provided with its upstream end 10 facing a position that captures almost all of the purification water separated from the downstream end 8 and a portion of the air containing paint mist. Air purification device containing paint mist in a paint booth with a flow path. 2. The paint mist-containing air purifying device for a paint booth according to claim 1, wherein a plurality of sets of the turning surface 7 and the next turning surface 9 are provided along the flow direction of the mixed flow. 3. The paint mist-containing air purification device for a paint booth according to claim 1, wherein the deflection surface 7 is flat or has a similar shape. 4. The paint mist-containing air purifying device for a paint booth according to claim 1, wherein the deflection surface 7 has a concave arc shape or a similar shape. 5. The paint mist-containing air purifying device for a paint booth according to claim 1, wherein the next-stage turning surface 9 has a concave arc shape or a similar shape. 6. The paint mist-containing air purification device for a paint booth according to claim 1, wherein the next-stage turning surface 9 has a planar shape or a similar shape. 7. Paint mist-containing air purification for a paint booth according to claim 4 or 5, wherein the arcuate surface has a true circular arc shape with a central angle of 180 degrees or approximately 180 degrees and both ends located above and below the center of curvature. Device.