JPH0116504Y2 - - Google Patents

Description

[Detailed Description of the Invention] The present invention aims to prevent paint mist and dust from air containing paint mist and dust generated during painting work in a paint booth. (including mist), and is also used in polishing, metallurgy, casting, fertilizer, lime industry, etc.
It is useful as an air pollution prevention device for various industries that generate dust, which is one of the causes of air pollution. Specifically, it has a mechanism at the bottom of the dust generating chamber that keeps the water level constant with the top open. A cleaning chamber equipped with an eliminator is installed in an upper position near the side of the tank, and a cleaning chamber with an eliminator is provided with a narrow gap between the lower edge of the side plate near the center of the tank and the control water surface in the tank. At or near the upper end of this cleaning chamber, the dust-containing air inside the chamber is directed along the water surface along with the water near the water surface near the gap, and through the narrow gap into the cleaning chamber. A fan is provided at the lower end of the cleaning chamber to draw air in at high speed.
The present invention relates to a no-pump type dust removal device that is provided with a flow direction conversion plate that applies centrifugal force to the dust-containing air and water sucked through the narrow gap, and a water channel that returns the dust-containing water to the bottom of the water tank.
More specifically, the water separated from the water surface in the water tank by the friction of the high-speed dust-containing air flow sucked into the cleaning chamber through the narrow gap is brought into the cleaning chamber with the dust-containing air. Water level control of the water tank necessary to perform the desired dust removal effect stably and effectively by quantitatively transferring the dust;
That is, it relates to a no-pump type dust removal device with a water level holding device.

Before explaining the conventionally known water level holding devices used in this type of no-pump type dust removal equipment and their drawbacks, we will explain the principle of operation in the no-pump type dust removal equipment with the above configuration. An overview is as follows. In other words, when air flows at high speed over the surface of water, the friction causes the surface of the water to be ripped off, causing the water to fly away in the form of droplets. When the flow direction of this droplet water and dust-containing air changes suddenly, the dust particles in the air are thrown out of the flow by the centrifugal force proportional to the product of the mass and the square of the speed of the airflow, and the dust particles in the air are thrown out of the air. Move into the water. Instead of spraying water pressurized by a pump, the basic principle of this device is to utilize the suction effect of water produced by high-speed airflow. Ensure that the water level in the tank is
The need for automatic retention is extremely high.

There are three types of water level holding devices that have been known in the past: ○A, ○B, and ○C below.

○B As shown in Fig. 6, a float ball tap 010b is floated above the water surface WL of the water tank 02, and the valve 014 interposed in the water supply pipe 013 is automatically operated via the displacement of the ball tap 010b as the water level fluctuates. A ball tap type that opens and closes automatically to maintain the water level at a set value.

○B As shown in FIG. 7, a floatless switch 015 equipped with two or more electrode rods 015a of different lengths and a solenoid valve 014 interposed in a water supply pipe 013
A floatless switch type that automatically maintains the water level at a set value using

○C As shown in FIG. 8, a pressure switch 016 is provided in the cleaning chamber 04, and this pressure switch 016
The solenoid valve 014, which is opened and closed in conjunction with the water supply pipe 0
A pressure switch type that automatically maintains the water level at a set value by intervening in

Note that the numbers of the structural members in FIGS.
Indicated with.

However, with ○A, not only is it easy for dust such as paint sludge floating on the water surface and paint mist floating in the air inside the painting booth to adhere to the ball and other moving parts, causing malfunctions. Ball taps have the disadvantage of large changes in the water level, and the ones in ○ and B can cause unexpected conduction due to the adhesion of dust floating on the water surface to the electrode rod, resulting in inaccurate water supply operation such as not being able to obtain a water supply signal. In addition, it is dangerous to use an electrical mechanism when applied to a painting booth that uses a lot of organic solvents, and to prevent this risk, explosion-proof It is also possible to use a type switch, but this has the drawback of being very expensive, and the type with ○C requires a pressure switch mounting hole to be provided in the cleaning chamber wall, and this hole will prevent dust and sludge from entering. There is a drawback that the switch may become clogged and the switch may malfunction or become impossible.

Above, I have described the individual drawbacks of ○A, ○B, and ○C, but all of them have a large control range and large water level fluctuations.
However, the biggest flaw was that the dust removal efficiency could not be maintained stably.

Therefore, if you want to avoid the use of electrical mechanisms and switches and simply maintain the water level, for example, as shown in Publication of Utility Model Publication No. 16743/1983, the upper tank and the lower tank should be connected. It is not unthinkable to use a technology that connects water supply pipes and ventilation pipes, but if the ventilation pipes that determine the water level are small in diameter, they are likely to become clogged with floating dust.
On the other hand, if this diameter is made large, there will be new problems such as floating dust flowing into the upper tank and causing malfunction of the valve provided in the water supply pipe.

In view of the above circumstances, the present invention has a simple structure, is easy to handle and maintain, is highly safe, and maintains a stable water level for a long period of time without being affected by dust. The purpose is to provide what is possible.

The characteristic configuration of the no-pump type dust removal device with a water level holding device according to the present invention devised to achieve the above object is that a closed tank having a water replenishment device is provided at the top of the water tank, and from this tank there is water inside the water tank. A water replenishment pipe is provided between the tank and the water tank, and a vent pipe is provided with its lower end opened at the control water level and its upper end opened and connected to the space inside the tank. Furthermore, the lower end opening of the ventilation pipe is configured to have a larger diameter than the other portions.The functions and effects of the device of the present invention having such a characteristic configuration are as follows.

In other words, during dust removal operation, if the water level in the water tank drops even slightly due to evaporation, etc., the lower end opening of the vent pipe, which had previously opened in contact with the water surface of the tank and was sealed, moves away from the water surface and the water seal is removed. Because of the breach, outside air flows into the space inside the closed tank through the ventilation pipe, and water corresponding to the amount of air flowing in flows out from the closed tank through the water supply pipe and into the water tank. As long as there is enough water in the closed tank, the water at the bottom opening of the vent pipe will be water-sealed again and the water supply will be automatically shut off. By effectively utilizing the natural phenomena of sealing action and water seal breaking action, the water level in the water tank can be stably maintained with extremely small fluctuation range.

Furthermore, since the lower end opening of the ventilation pipe is formed to have a larger diameter than other parts, that is, larger than the cross-sectional area of the flow path necessary for ventilation, floating dust adheres and accumulates on this lower end opening. It is easy to avoid clogging due to In other words, the diameter of the other parts of the vent pipe can be made sufficiently small despite having such a structure that does not easily clog, so that it is easy to avoid floating dust from flowing into the tank as much as possible.

Thus, in comparison with the conventional examples described above, (1) Since no electrical mechanism or movable structure is used to sense water level fluctuations, there are fewer failures and it is safe.

(2) Fluctuations in the control water level are slight.

(3) There are no or almost no malfunctions or clogging of ventilation pipes due to the influence of suspended dust.

(4) The synergy of the above (1) to (3) makes it possible to maintain reliable and stable water level maintenance over a long period of time, thereby ensuring the desired dust removal efficiency.

(5) It has a simple structure and is easy to handle and maintain.

This resulted in the following effects.

Embodiments of the present invention will be described below in detail based on the drawings. In FIG.
Overhead conveyor 17 that suspends and conveys
A grating floor 18 is provided at the bottom of the grating floor 18, and the grating floor 18 is configured so that the object A to be coated, which is suspended and conveyed, can be spray-painted manually from the side or by an automatic coating device. ing. Reference numeral 2 denotes a water tank installed at the bottom of the grating floor 18 of the painting booth 1 with the top open.
is equipped with a water level holding mechanism 7, which will be described later. Reference numeral 4 denotes a cleaning chamber 4 that stands above one side of the water tank 2, and inside this cleaning chamber 4, there are eliminators 3 that separate water droplets contained in the air in multiple stages, upper and lower. The adjacent ones protrude from the inner surfaces of side plates 4A and 4B facing each other in an inclined attitude toward the center of the room, and
Among the opposing side plates 4A and 4B, the lower edge 4a of the side plate 4A near the center of the water tank 2 is formed in a sawtooth shape,
This serrated lower edge 4a and a control water surface in the water tank 2
A narrow gap 5 is formed between the WL and the WL. Further, a fan 6 is installed at the upper end of the cleaning chamber 4 to draw the dust-laden air generated in the booth 1 along the water surface WL and into the cleaning chamber 4 through the narrow gap 5 as a high-speed flow. is provided, and the water surface is stripped off by the high-speed flow of the fan 6, and the droplets are entrained into the cleaning chamber 4 through the gap 5. In addition, the cleaning chamber 4
At the lower end of the inner side, on the side where the narrow gap 5 exists, there is a spiral flow direction changing plate 8 that causes the dust-containing air and splashed water sucked through the gap 5 to move in a circular motion to apply centrifugal force to them. is provided, and a water collection plate 19 having a downward slope in the opposite direction to the side where the gap 5 exists is provided in series with the end of the flow direction conversion plate 8 inside the cleaning chamber 4, and this water collection plate 19 Board 1
A water channel 9 is provided at the lower end of the water tank 9 so that the separated dust-containing water, which is thrown out of the flow by the centrifugal force, is returned to the bottom of the water tank 2.

In the no-pump type dust removal device having the above configuration, the water level holding mechanism 7 described above is configured as follows.

As clearly shown in FIG. 3, a closed tank 10 having a water refilling device 10A is provided outside the booth 1 above the water tank 2, and a water replenishment pipe 11 from this tank 10 to the inside of the water tank 2 is provided. At the same time, extending between the tank 10 and the water tank 2, the lower end 12A thereof is opened at the control water surface WL,
A ventilation pipe 12 is provided with its upper end 12B connected to the space inside the tank 10 through an open connection. As shown in FIG. 4, the lower end opening 12A of the ventilation pipe 12 is made of a separate member in the shape of a latch and has a sufficiently larger diameter than the other parts, so that the opening 12A of the lower end of the ventilation pipe 12 is made of a separate member with a diameter sufficiently larger than that of the other parts. At the time of suction, the suction wind speed is lowered to suppress clogging of the pipe 12 due to suction of dust.

The water refilling device 10A automatically opens and closes the valve 14 connected to the water supply pipe 13 and the valve 20 connected to the water refill pipe 11 periodically by setting a timer 10a. A fixed amount of water is supplied into the tank 10, and then the valve 1
The valve 4 is configured to be fully automatic so that the valve 20 is automatically closed and the valve 20 is automatically opened.

As another embodiment, the water refilling device 10A may be configured as a fully automatic ball tap type, and
As shown in FIG. 5, the valves 14 and 20 may be manually opened and closed periodically, but in this case, it is preferable to provide a viewing window 21 for checking the water level.

Note that although reference numerals are written in the claims section of the utility model registration for convenience of comparison with the drawings, the present invention is not limited to the structure of the attached drawings by such entry.

[Brief explanation of drawings]

Fig. 1 is a partially cutaway side view of the entire device, Fig. 2 is an enlarged sectional view taken along the line - Fig. 1, Fig. 3 is an enlarged partially cutaway side view of the water level holding device, and Fig. 4 is a partially cutaway side view of the water level holding device. 3
FIG. 5 is a schematic side view showing another embodiment, and FIGS. 6 to 8 are partially cutaway side views of the conventional example. 1...Dust generation room, 2...Water tank, 3...Eliminator, 4...Cleaning room, 5...Narrow gap, 6...
Fan, 7... Water level holding mechanism, 8... Flow direction conversion plate, 9... Circulation waterway, 10... Sealed tank,
11... Water supply pipe, 12... Ventilation pipe, 12A... Lower end opening.

Claims (1)

[Scope of Claim for Utility Model Registration] 1. A water tank 2 with an open top surface and a mechanism 7 for keeping the water level constant is provided at the bottom of the dust generation chamber 1, and at an upper position near the side of this water tank 2, A cleaning chamber 4 inside the eliminator 3 is installed vertically with a narrow gap 5 formed between the lower edge of the side plate 4A near the center of the water tank 2 and the control water surface WL in the water tank 2. At or near the upper end of 4, the dust-containing air in the chamber 1 is connected to the water surface WL along with the water near the water surface near the gap 5.
A fan 6 is provided at the lower end of the cleaning chamber 4 to draw air into the cleaning chamber 4 at high speed along the narrow gap 5. The water level of the water tank 2 is maintained in the no-pump type dust removal device, which is provided with a flow direction conversion plate 8 that applies centrifugal force to the dust-containing air and water, and a water channel 9 that returns the dust-containing water to the bottom of the water tank 2. In configuring the mechanism 7, a closed tank 10 having a water replenishment device 10A is provided on the upper part of the water tank 2, and a water replenishment pipe 11 from this tank 10 to the inside of the water tank 2 is provided. 1
0 and the water tank 2, its lower end 12A is opened at the control water surface WL, and its upper end 12A is opened at the control water surface WL.
A vent pipe 12 is provided in such a manner that B is open-connected to the air in the tank 10, and the lower end opening 12A of the vent pipe 12 is configured to have a larger diameter than other parts. A no-pump type dust removal device with a water level holding device. 2. The water level holding device according to claim 1, wherein the water refilling device 10A is a fully automatic type configured to automatically open and close based on the settings of the timer 10a. A no-pump type dust removal device.