The present invention relates to an exhaust/drainage mechanism having an exhaust channel and a drainage channel for contaminated air and contaminated water discharged from a coating booth.
Conventionally, as this type of exhaust/drainage mechanism, there is known a mechanism in which a scum receiving inlet is provided at the upper edge part of a tank provided in a drainage channel, and floating coating scum floating on the upper surface in the tank flows into the scum receiving inlet due to overflow of contaminated water (for example, see Patent Literature 1).
Patent Literature 1: Japanese Patent Application Publication No.: JP 2014-226609 A (paragraph [0028])
However, in the conventional exhaust/drainage mechanism described above, floating coating scum is scattered, and much contaminated water not containing floating coating scum flows into the scum receiving inlet in some cases. That is, in the conventional exhaust/drainage mechanism, there is a problem that floating coating scum cannot be efficiently collected.
The present invention has been made in view of the above issue, and an object of the present invention is to provide an exhaust/drainage mechanism capable of efficiently collecting floating coating scum.
An exhaust/drainage mechanism according to the present disclosure conceived to achieve the above object includes: an exhaust channel which guides contaminated air discharged from a coating booth together with non-attached paint; a drainage channel which guides contaminated water discharged from the coating booth together with non-attached paint; a scum receiving inlet which is provided in the drainage channel and into which the floating coating scum floating on the contaminated water flows; and a dual-purpose flow channel which is used as both of the exhaust channel and the drainage channel. The contaminated air flows through an upper part of the dual-purpose flow channel. The contaminated water flows through a lower part of the dual-purpose flow channel. A wind pressure of the contaminated air generates, in an upper part of the contaminated water, an upper-layer flow which flows in a direction or at a velocity different from a direction or a velocity of a flow in a lower part of the contaminated water. A dynamic pressure of the upper-layer flow pushes and moves the floating coating scum to the scum receiving inlet.
Hereinafter, an embodiment of the present invention will be described with reference to
A ceiling board 11 of the coating booth 10 has a mesh structure, for example, and the floor board 12 has a mesh structure which is rougher than the ceiling board 11. Further, under the floor board 12, there is provided an underfloor space 12A, and a discharge port 17 is formed in a lower part of one side surface of a surrounding wall surrounding the underfloor space 12A. Then, pressurized air is supplied into a ceiling space 11A, an airflow goes down from the ceiling board 11 and flows into the underfloor space 12A together with non-attached paint. Then, the contaminated air CA including the non-attached paint is discharged from the discharge port 17 to the outside of the coating booth 10.
An underfloor surface 13 is opposed to the floor board 12 from the lower side with the underfloor space 12A therebetween, and the underfloor surface 13 is inclined downward toward one side edge on the discharge port 17 side. A plurality of fountain parts 14 are provided on a side edge, of the underfloor surface 13, opposite to the discharge port 17, and water containing an aggregating agent is ejected from the fountain parts 14 to the underfloor surface 13, so that the entire underfloor surface 13 is filled with water. Then, the water on the underfloor surface 13 takes in the non-attached paint and becomes contaminated water CW, and the contaminated water CW is discharged from the discharge port 17 to the outside.
The above discharge port 17 extends in the horizontal direction along one side surface of the coating booth 10. Then, the contaminated air CA and the contaminated water CW discharged from the discharge port 17 flow into an exhaust/drainage mechanism 90 according to the present invention. The exhaust/drainage mechanism 90 includes a relay duct 20C, a first flow channel 20, a second flow channel 21, a dust separator 28, and the like which will be described below. The first flow channel 20 has a duct shape having, for example, a rectangular cross section and extends along one side surface of the coating booth 10. The first flow channel 20 communicates with the underfloor space 12A through the relay duct 20C extendingly provided on the side of the coating booth 10.
As shown in
In the second flow channel 21, a separation wall 25 is provided in a middle part in the longitudinal direction, and the second flow channel 21 is divided by the separation wall 25 into a vortex flow generation chamber 26 (corresponding to an “extended part” of the present invention) on the passing part 24 side and a storage chamber 27 on the opposite side of the vortex flow generation chamber 26. As shown in
As shown in
As shown in
In this arrangement, as shown in
A scum receiving inlet 30 is formed in the separation wall 25 to take in the floating coating scum F from the vortex flow generation chamber 26 into the storage chamber 27. The scum receiving inlet 30 is formed by cutting out a part of the separation wall 25 at a position, for example, closer to the second inner side surface 21C from the lower end to a position above the water surface of the contaminated water CW such that the cut-out part has a rectangular shape.
An internal door 31 for opening and closing the scum receiving inlet 30 is vertically slidably held on the separation wall 25, and the internal door 31 can be opened and closed from the storage chamber 27 side. In addition, a maintenance window 35 is formed in an outer wall of the storage chamber 27, and the maintenance window 35 is normally closed with an external door 36. With this arrangement, when the external door 36 is opened, it is possible to perform maintenance such as cleaning of the storage chamber 27. At this time, by closing the internal door 31, it is possible to prevent outside air from being sucked through the scum receiving inlet 30 into the vortex flow generation chamber 26, and it is thus possible to prevent the negative pressure in the vortex flow generation chamber 26 from being reduced. As a result, it is possible to perform maintenance of the inside of the storage chamber 27 while the coating booth 10 is being operated.
A contaminated water guide 32 is provided in the vortex flow generation chamber 26 to guide the floating coating scum F being circulated in the vortex flow generation chamber 26 by the upper-layer swirling flow HR, into the scum receiving inlet 30. The contaminated water guide 32 has a band plate shape extending from a corner portion between the separation wall 25 and the second inner side surface 21C along the bisector of the corner portion. A lower edge part of the contaminated water guide 32 is above a lower end of the separation wall 25. An upper edge part of the contaminated water guide 32 is above the upper surface of the contaminated water CW and is at substantially the same position as the upper edge part of the scum receiving inlet 30. By the contaminated water guide 32, the flow of the surface layer portion of the upper-layer swirling flow HR is directed to the side of the scum receiving inlet 30, and the floating coating scum F is thus gathered on the side of the scum receiving inlet 30 and flows into the storage chamber 27.
In the storage chamber 27, a suction pump 34 is disposed in the water. A suction pipe 39 attached to the suction pump 34 has a bellows structure, extends vertically on the side of the suction pump 34, and an upper end part of the suction pipe 39 is opened upward. In addition, a float 38 is attached to the upper end part of the suction pipe 39 so as to surround the opening, and the suction pipe 39 extends and contracts in accordance with a change in the water surface of the contaminated water CW (a part of the suction pipe 39 that extends and contracts is an operation part of the present invention), and an upper surface opening of the float 38 is slightly below the surface of the contaminated water CW. The discharge pipe 37 extending from the suction pump 34 and passing through the storage chamber 27 is connected to a coating scum disposal device (not shown) outside the storage chamber 27, and the floating coating scum F floating on the water surface of the storage chamber 27 is sucked by the suction pump 34 and is conveyed to the coating scum disposal device.
The floating coating scum F conveyed to the coating scum disposal device is dehydrated by a dehydrator, is compressed, and is packed in a container and is disposed as industrial waste. Further, the contaminated water CW fed to the above described water purifier 40 (see
The structure and operation of the exhaust/drainage mechanism 90 of the present embodiment has been described above. Next, an effect of the exhaust/drainage mechanism 90 will be described. In the exhaust/drainage mechanism 90, the upper-layer swirling flow HR is generated in the contaminated water CW by the wind pressure in the vortex flow generation chamber 26, and the floating coating scum F is pushed and moved to the scum receiving inlet 30 by the dynamic pressure of the upper-layer swirling flow HR. Therefore, even if the contaminated water CW flows slow as a whole, the floating coating scum F is quickly moved to the scum receiving inlet 30 and can thus be efficiently collected. In addition, since the upper-layer swirling flow HR of the contaminated water CW is generated by using the wind pressure of the contaminated air CA discharged from the coating booth 10, energy saving can be achieved compared with the case where a separate power source is provided. Here, even if a part of floating coating scum F deviates from the contaminated water guide 32 due to too much floating coating scum F, the floating coating scum F is directed to the contaminated water guide 32 by the upper-layer swirling flow HR again and again, so that even a large amount of floating coating scum F can be surely guided to the scum receiving inlet 30.
In addition, the floating coating scum F taken into the scum receiving inlet 30 is stored in the storage chamber 27 which is hardly affected by the flow of the upper-layer flow. Then, since the floating coating scum F is discharged to the outside through the suction pipe 39 which is opened upward in the vicinity of the gentle water surface in the storage chamber 27, the amount of water discharged together with the floating coating scum F can be reduced. In addition, since the suction pipe 39 is provided with the float 38 for causing the upper surface opening to follow the surface of the contaminated water CW, the amount of water discharged together with the floating coating scum F can also be reduced in this respect.
An exhaust/drainage mechanism 90V of the present embodiment is shown in
The present invention is not limited to the above embodiments, and, for example, the embodiments described below are also included in the technical scope of the present invention. In addition, other than the following embodiments, the present invention can be variously modified and practiced without departing from the spirit of the invention.
(1) In the first and second embodiments, the upper-layer flow of the contaminated water CW is swirled by the wind pressure of the contaminated air CA, but the upper-layer flow of the contaminated water CW may not be swirled. Specifically, for example, as shown in
(2) In the first embodiment, an aggregating agent is added to the water ejected from the fountain parts 14 in the coating booth 10, but the aggregating agent may be added to the contaminated water CW on the downstream side, of the discharge port 17, outside the coating booth 10.
Number | Date | Country | Kind |
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JP2016-190503 | Sep 2016 | JP | national |
Filing Document | Filing Date | Country | Kind |
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PCT/JP2017/031431 | 8/31/2017 | WO | 00 |
Publishing Document | Publishing Date | Country | Kind |
---|---|---|---|
WO2018/061604 | 4/5/2018 | WO | A |
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3516230 | Saubesty | Jun 1970 | A |
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5372711 | Sill | Dec 1994 | A |
5741178 | Telchuk | Apr 1998 | A |
Number | Date | Country |
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S51-134873 | Oct 1976 | JP |
H05-028490 | Apr 1993 | JP |
H05-146727 | Jun 1993 | JP |
H07-185394 | Jul 1995 | JP |
H07185394 | Jul 1995 | JP |
H08-309263 | Nov 1996 | JP |
H08309263 | Nov 1996 | JP |
H09-314025 | Dec 1997 | JP |
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2003-205286 | Jul 2003 | JP |
2004-057968 | Feb 2004 | JP |
2014-046262 | Mar 2014 | JP |
2014-180657 | Sep 2014 | JP |
J 2014180657 | Sep 2014 | JP |
2014-226609 | Dec 2014 | JP |
5842876 | Jan 2016 | JP |
10-2012-0108283 | Oct 2012 | KR |
Entry |
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Apr. 2, 2019 International Preliminary Report on Patentability issued in International Patent Application No. PCT/JP2017/031431. |
Nov. 14, 2017 International Search Report issued in International Patent Application No. PCT/JP2017/031431. |
May 12, 2020 Office Action issued in Japanese Patent Application No. 2016-190503. |
May 28, 2020 Office Action issued in Chinese Patent Application No. 201780045458.0. |
Number | Date | Country | |
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20190329284 A1 | Oct 2019 | US |