JP2017140585A - Coating mist collecting apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a coating mist collecting apparatus that enhances collection efficiency and reduces the cost of water to be used.SOLUTION: A coating mist collecting apparatus comprises a collection part, a cleaning water supplier upstream of the collection part, a water guide plate having a gradient directing to a gas water intake port to guide water supplied from the cleaning water supplier into the gas water intake port, and a blower that exhausts, outside of the collection chamber, the gas guided through the air duct of the collection part into the collection chamber, where the collection part comprises a spiral passage that is an air duct which swivels around a swivel shaft arranged horizontally by making the outer periphery side of the upstream side passage connected to the water intake port, and the center side of the downstream side passage, a discharge port having the downstream side passage connected to open into the collection chamber in the swivel shaft, and a throttle part the passage cross section of which is restricted.SELECTED DRAWING: Figure 1

Description

  The present disclosure relates to a paint mist collecting device that separates and collects paint mist from a gas containing paint mist generated in a paint room (painting booth) and cleans the air.

  As a conventional device that separates and collects paint mist from a gas containing paint mist scattered in a paint booth and exhausts the air to the outside, a wet collection device is known (for example, Patent Documents). 1).

  Such a conventional wet collection device will be described with reference to FIG.

  As shown in FIG. 7, in the painting booth 501, for example, a paint using an organic solvent as a solvent is sprayed from the painting robot 502 toward the object (object to be coated) 504 in a mist form. Therefore, the painting booth 501 is filled with the coating mist 503 called overmist that has not adhered to the object 504. If the air containing the coating mist 503 is discharged by the blower 505 as it is, the outside environment will be greatly contaminated by the coating mist 503. Therefore, a wet collection device 506 provided with a collection chamber 520 is installed between the painting booth 501 and the blower 505.

  The wet collection device 506 is provided below a grating-like grating 507 installed in the painting booth 501. The air containing the coating mist 503 is sucked into the wet collection device 506 from above. In the wet collection device 506, first, the air containing the coating mist 503 is guided to the first venturi 509 where the air containing the coating mist 503 and the water 508 are contact-mixed. The first venturi 509 is a gap obtained by arranging a water reservoir 510 that drops and supplies water 508 from above and an inclined plate A511. Water 508 is separately supplied from the water tanks 512 provided on the left and right sides of the water reservoir 510 through the inclined plate A511, and the water 508 is guided to the first venturi 509 through the inclined plate A511.

  The first venturi 509 has a shape narrowed like a nozzle, and the air guided from the coating booth 501 passes in a state where the passage speed is increased. The water 508 guided to the first venturi 509 is caught in the air flowing at high speed and is torn and becomes a mist. The air and mist-like water 508 are mixed in the first venturi 509, and the coating mist 503 contained in the air comes into contact and is taken into the mist-like water 508. Thereafter, the air and the water 508 are guided to the second venturi 514 formed by the two inclined plates B513, where the air and the mist-like water 508 are mixed, and the coating mist 503 in the air comes into contact with the mist. Of water 508.

  The mist-like water 508 falls by gravity to a treated water tank 515 provided below the second venturi 514. The mist-like water 508 that has been carried on the air flow without falling collides with the baffle plate 516 provided on the downstream side of the second venturi 514, and then is collected in the treatment water tank 515 through the inclined plate C 517. The water 508 collected in the treated water tank 515 contains the collected paint mist 503. Therefore, a flocculant containing sodium aluminate or the like is introduced, and the coating mist 503 dispersed in the water 508 aggregates to form a lump (hereinafter referred to as sludge). Thereafter, the water 508 is separated into sludge and water 508 from which the coating mist 503 has been removed to some extent by passing through the separation device 518. The water 508 obtained by separating the sludge is pumped up to the water storage tank 512 by the pump 519, sent again to the first venturi 509, and used for collecting the paint mist 503.

JP-A-6-254454 (5th page, FIG. 1)

  Such a conventional wet collection device generally obtains a collection efficiency of about 80 to 90% by a filter paper weight method, but it is required to further improve the collection efficiency.

  Since a large amount of water is used to collect the paint mist, a large amount of water containing the paint mist is generated. Therefore, a large amount of a flocculant is required to agglomerate the underwater paint mist into sludge. At the same time, there is a problem in that the amount of water exchanged and discarded increases, the amount of water used for collection increases, and the cost of water increases.

  Then, this indication solves the said conventional subject, and aims at providing the coating mist collection apparatus which raises collection efficiency and reduces the cost of the water to be used.

  In order to achieve the above object, the paint mist collecting device according to one aspect of the present disclosure has an air passage that guides the gas containing the paint mist sucked from the painting chamber together with water to the collecting chamber, A collector that separates the paint mist from the gas containing the paint mist by passing through the air channel, a water supply device that supplies water upstream of the collector, and an air intake port that is the entrance of the air channel A water guide plate that has a gradient toward the water and guides the water supplied from the water supply device to the air intake port, and a blower that exhausts the gas guided into the collection chamber through the collection unit to the outside of the collection chamber. The collecting section is a spiral passage that is an air passage that swirls around a swivel axis that is disposed in the horizontal direction, with the upstream passage connected to the air / water intake port as the outer peripheral side and the downstream passage as the central side. Is connected to the downstream passage and opens into the collection chamber in the direction of the pivot axis. And it has been the discharge port, provided in a spiral-like passage comprises a throttle portion for passage cross section is narrowed, and those.

  According to the present disclosure, it is possible to provide a paint mist collecting device that can improve the collection efficiency and reduce the processing cost of water used for collecting the paint mist.

The block diagram which shows the whole coating mist collection apparatus of one embodiment of this indication Cross-sectional perspective view of paint mist collecting device of embodiment External view of the collection part of the paint mist collection device of the embodiment External view of the collection part of the paint mist collection device of the embodiment The block diagram which shows the cross section of the collection part of the coating mist collection apparatus of embodiment Cross-sectional perspective view of paint mist collecting device of embodiment Configuration diagram showing a conventional wet collection device used in a painting booth

  The coating mist collecting apparatus according to the first aspect of the present disclosure has an air passage through which the coating mist-containing gas sucked from the painting chamber is passed with water and led to the collecting chamber, and the coating mist is allowed to pass through the air passage. A water supply device having a collecting portion for separating the coating mist from the contained gas, a water supply device for supplying water on the upstream side of the collecting portion, and a gradient toward the air / water intake port which is an inlet of the air passage. A water guide plate that guides the water supplied from the air to the air intake port, and a blower that exhausts the gas guided into the collection chamber through the collection unit to the outside of the collection chamber. The upstream side passage connected to the intake port is the outer peripheral side, the downstream side passage is the central side, the spiral passage that is a wind passage that turns around the turning axis arranged in the horizontal direction, and the downstream side passage are connected, A discharge port opened into the collection chamber in the direction of the swivel axis and a spiral passage Vignetting comprises a narrowed portion passage section is narrowed, and those.

  The paint mist collecting apparatus according to the second aspect of the present disclosure is the paint mist collecting apparatus according to the first aspect, wherein the spiral passage is defined by a wall member arranged in a spiral around the pivot axis. The wall member has an arcuate outer peripheral side portion serving as an outer peripheral side wall of the spiral passage, and an inner peripheral side portion disposed inside the outer peripheral side portion and serving as an inner peripheral side wall of the spiral passage, A plurality of bent portions are provided as throttle portions on the inner peripheral side portion of the member.

  The paint mist collection device of the third aspect of the present disclosure is the paint mist collection device of the first aspect or the second aspect, in which a plurality of collection parts are arranged so that the discharge ports face each other.

  The paint mist collecting apparatus according to the fourth aspect of the present disclosure is the paint mist collecting apparatus according to any one of the first to third aspects. In the upstream side passage of the spiral passage, the connection portion to the air / water intake port is It extends in the vertical direction.

  Hereinafter, embodiments according to the present disclosure will be described in detail with reference to the drawings.

(Embodiment)
A paint mist collecting device according to an embodiment of the present disclosure is shown in FIG. 1, and a cross-sectional perspective view is shown in FIG. 2. In the painting booth 1 which is a painting room, the object 4 is painted by the painting mist 3 sprayed by the painting robot 2. The paint mist 3 that cannot adhere to the object 4 is called overmist and floats in the air. In this state where the overmist drifts, the coating mist 3 drifting in the air adheres to the object 4 to be coated next, and the coating quality is lowered. Therefore, air that has been air-conditioned, ventilated, and purified to some extent is sent into the painting booth 1 from the ceiling downward. The air containing the coating mist 3 (hereinafter referred to as “paint mist-containing gas”) is sucked into the coating mist collecting device 7 through the air / water intake port 6 installed below the grating 5. Thus, the paint mist 3 drifting in the air is quickly discharged from the paint booth 1. In FIG. 1, the flow of air (including the paint mist-containing gas) is indicated by reference numeral 11, and the flow of water is indicated by reference numeral 12.

  The configuration of the paint mist collecting device 7 of the present embodiment will be specifically described. The painting mist collection device 7 includes a collection unit 13, a water supply device 30, a first water guide plate 10, a collection chamber 32, and a blower 14. In addition, the coating mist collection apparatus 7 of this Embodiment is a wet processing apparatus.

  The collection unit 13 has an air passage 31 that passes the paint mist-containing gas sucked from the paint booth 1 together with water and guides it to the collection chamber 32, and paints from the paint mist-containing gas by passing the air passage 31. Has the function of separating mist. The inlet (upper side opening in FIG. 1) of the air passage 31 serves as an air / water intake 6 for taking in the paint mist-containing gas from the paint booth 1 and the water 9 supplied from the water supply device 30. In addition, the detailed structure of the collection part 13 is mentioned later.

  The water supply device 30 includes a treated water tank 23 provided in the collection chamber 32 and a pump 28 that pumps up the water 9 in the treated water tank 23 and supplies it to the upstream side of the collection unit 13. In addition, the water supply device 30 includes a water storage tank 8 that stores the water 9 supplied by the pump 28, overflows the stored water, and supplies the water toward the air / water intake port 6. The water supply device 30 supplies water 9 to the air / water intake 6 on the upstream side of the collection unit 13.

  The treated water tank 23 is a water tank for storing and collecting the water 9 introduced into the collection chamber 32 and taking in the paint mist. A flocculant is introduced into the treated water tank 23, and the coating mist contained in the water 9 is aggregated to become sludge. The pump 28 is connected to the treated water tank 23 and the water storage tank 8 through a pipe. A separation device 27 is provided between the treated water tank 23 and the pump 28, and the separation device 27 separates the water 9 and the sludge. As a result, the pump 28 can supply the water 9 with the paint content reduced to the water tank 8.

  The collection chamber 32 has an internal space defined by a side wall, a bottom portion, and an upper wall. The upper wall of the collection chamber 32 is constituted by, for example, the water storage tank 8 and the first water guide plate 10. The water storage tank 8 is arrange | positioned at the right-and-left end edge side of the upper wall of the collection chamber 32 of FIG. The first water guide plate 10 has a gradient descending from the upper end of each water storage tank 8 toward the air / water intake port 6 disposed on the center side of the paint mist collecting device 7. With such a configuration, the water 9 overflowed in the water storage tank 8 can be guided to the air / water intake 6 by the gradient of the respective first water guide plates 10. That is, the first water guide plate 10 guides the water 9 supplied from the water supply device 30 to the air / water intake port 6.

  A discharge guide 19 is provided at the outlet of the air passage 31 in the collection chamber 32. The discharge guide 19 guides the water 9 flowing out from the outlet of the air passage 31 to the treated water tank 23 disposed at the bottom of the collection chamber 32.

  In the collection chamber 32, a plurality of baffle plates 24 arranged in a direction intersecting the overall air flow direction are arranged between the outlet of the air passage 31 and the inlet of the blower 14. Yes. When air passes through the passage 25 formed between these baffle plates 24, the air 9 collides with the baffle plates 24, so that the water 9 remaining in the air is removed and falls. Below each baffle plate 24, a second water guide plate 26 that guides the dropped water 9 to the treated water tank 25 is provided.

  The blower 14 sucks and exhausts air from which water has been removed by the plurality of baffle plates 24 to the outside of the collection chamber 32. Further, the capacity of the blower 14 and the resistance (pressure loss) of the suction path including the air path 31 and the like are set so that a predetermined suction force acts on the upstream side of the air / water intake port 6 through the air path 31. . In addition, you may make it return part of the air sent out by the air blower 14 as the air conditioned by the painting booth. In this case, an air conditioner that adjusts the temperature and humidity of the air may be provided.

  Next, the detailed structure of the collection part 13 is demonstrated. The external view (perspective view) of the collection part 13 is shown in FIG. 3 and FIG. Moreover, sectional drawing of the collection part 13 is shown in FIG.

  The collection unit 13 has a function of mixing the paint mist-containing gas introduced from the air / water intake port 6 and water, taking the paint mist into water, and separating the water from which the paint mist has been taken in from the air. .

  The collection unit 13 includes a spiral passage 40 connected (communication) to the air / water intake port 6 and connected (communication) to the discharge port 45 opened in the collection chamber 32 as the air passage 31.

  In the collection unit 13, the spiral passage 40 is an air passage that turns around a turning axis arranged in the horizontal direction, and has an upstream passage 40 a connected to the steam-water intake port 6 as an outer peripheral side, and a downstream side. The passage 40b is on the center side (inner peripheral side than the upstream passage 40a). That is, the spiral passage 40 is a flow path that turns from the outer peripheral side toward the inner peripheral side.

  Specifically, as shown in FIG. 5, the spiral passage 40 is defined by a wall member 41 arranged in a spiral around the pivot axis. As shown in FIGS. 3 and 4, side wall members 44 are fixed to both ends of the wall member 41 in the turning axis direction so as to be orthogonal to the turning axis. A discharge port 45 opened in the direction of the pivot axis is provided at the central portion of each side wall member 44, and the discharge port 45 opens into the collection chamber 32. Each discharge port 45 is connected to a downstream passage 40 b of the spiral passage 40. In the present embodiment, the pivot axis is located substantially at the center of each discharge port 45.

  In addition, a connection portion to the air / water intake port 6 in the upstream-side passage 40a of the spiral passage 40 is a vertical passage portion 46 that extends substantially in the vertical direction.

  As shown in FIG. 5, the wall member 41 is disposed on the outer peripheral side portion 42 that becomes the outer peripheral wall of the spiral passage 40, and on the inner side (swivel axis side) of the outer peripheral portion 42. It has the inner peripheral side part 43 used as the wall of an inner peripheral side.

  As shown in FIG. 5, the outer peripheral side portion 42 of the wall member 41 has an arcuate cross-sectional shape. The inner peripheral side portion 43 of the wall member 41 is configured in such a manner that the wall member 41 having a linear cross-sectional shape is bent at a plurality of locations and circulates around the turning shaft. The bent portion is a bent portion 47, and a corner is formed between adjacent wall members 41 in the bent portion 47. In the form shown in FIG. 5, the angle in the bending part 47 is an obtuse angle, for example.

  As shown in FIG. 5, in the spiral passage 40, the cross section of the passage is narrowed at the formation position of the bent portion 47 as compared with the passages in the vicinity of the front and rear. A portion where the cross section of the passage is narrowed is a narrowed portion 48. In the spiral passage 40, a plurality of narrowed portions 48 are provided along the flow direction. The narrowed portion 48 is not only between the bent portion 47 of the inner peripheral side portion 43 of the wall member 41 and the arc-shaped outer peripheral side portion 42, but also on the linear portion of the inner peripheral side portion 43 and further on the inside thereof. It is provided also between the bent part 47 of the inner peripheral side part 43 arrange | positioned.

  FIG. 6 is a cross-sectional perspective view of the paint mist collecting device 7. As shown in FIGS. 2 and 6, the coating mist collecting device 7 includes a plurality of collecting portions 13. In the upper wall of the collection chamber 32, a plurality of air intake ports 6 are arranged along the swivel axis direction of the collection unit 13. The unit 13 is connected. The adjacent collection parts 13 are arranged so that the discharge ports 45 face each other while being separated by a predetermined distance.

  As shown in FIGS. 2 and 6, the discharge guide 19 is disposed so as to extend in the arrangement direction of the collection units 13 so as to cover the lower side of the discharge ports 45 of all the collection units 13, for example. Has been. Moreover, the discharge guide 19 is provided along the lower part of the circular-arc-shaped outer peripheral side part 42 of the wall member 41 in the collection part 13, and has the gradient which goes to the treated water tank 23. FIG.

  Operation | movement of the coating mist collection apparatus 7 of this Embodiment which has such a structure is demonstrated.

  First, by driving the blower 14, the air in the collection chamber 32 is exhausted, and a suction force acts on the upstream side of the air / water intake port 6 through the air passage 31. As a result, the coating mist-containing gas is sucked into the air-water intake ports 6 through the grating 5. Moreover, the water overflowed from each water storage tank 8 is guided to the air / water intake 6 by the first water guide plate 10 and is sucked into the air / water intake 6 or falls due to the action of gravity.

  The coating mist-containing gas and water are taken into the upper and lower passage portions 46 in the collecting portion 13 through the air / water intake port 6. Thereafter, the taken paint mist-containing gas and water are sucked into the spiral passage 40. In the spiral passage 40 shown in FIG. 5, since the passage section is narrowed in the throttle portion 48, the coating mist-containing gas and water pass so as to be ejected. The water is refined into a mist by this jet, and the mist-like water and the paint mist-containing gas are vigorously mixed. In this mixing process, the paint mist contained in the paint mist-containing gas becomes mist. Taken in contact with water.

  Since the spiral passage 40 is provided with a plurality of constricted portions 48 along the flow direction, such mixing is repeated, and the coating mist contained in the coating mist-containing gas comes into contact with the mist-shaped water. To be captured. Further, since the spiral passage 40 is also a passage that revolves around the revolving axis, the effect of mixing the coating mist-containing gas and water can be enhanced in combination with the effect of the revolving energy.

  Thereafter, the water and the air (gas) that have taken in the coating mist are discharged from the discharge port 45 while the angle is bent 90 degrees in the direction of the turning axis. In the adjacent collection part 13, since the discharge port 45 is arrange | positioned facing each other, the fluid (water and air) discharged | emitted from each discharge port 45 collides with each other from the front. In the process, the paint mist remaining in the air is further taken into water. At the same time, the waters that have taken in the discharged paint mist combine to form a large mass of water, and the water that has taken in the paint mist and air are separated.

  The water 9 and the air that have taken in the paint mist and the air are guided obliquely downward along the discharge guide 19, the water 9 falls into the treatment water tank 23, and the air is guided to the passage 25 between the baffle plates 24. The water 9 remaining in the air is removed when the air collides with the baffle plate 24, and the air from which the water has been removed is discharged to the outside of the apparatus by the blower 14. The water removed by the baffle plate 24 falls and is guided to the treated water tank 23 by the second water guide plate 26.

  In the treated water tank 23, when the flocculant is added, the coating mist is aggregated into sludge. Thereafter, the water containing the sludge passes through the separation device 27, so that the sludge is separated and collected, and the water from which the sludge has been removed is sent out again to the water storage tank 8 by the pump 28.

  According to the paint mist collecting device 7 of the present embodiment, the collecting unit 13 has the thin winding passage 40, and the plurality of constricting portions 48 in which the passage section is narrowed in the spiral passage 40 are provided. When passing through each throttle part 48, the paint mist-containing gas and water are jetted out and mixed, and in this mixing process, the paint mist contained in the paint mist-containing gas is taken into the mist-shaped water. Can do.

  Therefore, since the paint mist-containing gas and water can be mixed efficiently and the paint mist can be separated and collected, the amount of water required for collecting the paint mist can be reduced. Further, by reducing the amount of water used, the amount of flocculant used can be reduced, and various costs associated with the use of water can be reduced.

  Moreover, since the usage-amount of water can be made small, compared with the case where a lot of water is used, the raise of the humidity of the air after coating mist collection can be suppressed. Therefore, for example, in an apparatus configuration including an air conditioner that returns air-conditioned air that has collected paint mist to the painting booth 1, the air-conditioning cost can be reduced.

  Moreover, in the collection part 13, since the spiral channel | path 40 is provided as the air path 31, it becomes possible to provide a thin and long channel | path compactly.

  In the above-described embodiment, the case where the narrowed portion 48 in the spiral passage 40 is formed by the bent portion 47 is taken as an example. However, the narrowed portion may be in any form as long as the passage is narrowed. Also good. For example, a protruding portion may be provided on the wall member 41 to narrow the passage. Such a protruding portion is not limited to the case where the wall member 41 itself is processed and formed, and may be formed by providing another member on the wall member 41.

  Moreover, although the case where a plurality of throttle portions 48 are provided in the spiral passage 40 has been described as an example, at least one throttle portion 48 may be provided. However, by providing the plurality of throttle portions 48, it is possible to enhance the mixing effect on the fluid passing therethrough.

  Moreover, although the case where the several collection part 13 was arranged was taken as an example, you may make it provide only one collection part 13, for example. In this case, you may make it extend the collection part 13 according to the depth of the apparatus of a turning axis direction. However, by arranging the plurality of collecting portions 13 so that the discharge ports 45 face each other, the discharged fluids can collide with each other, and the effect of air-water separation can be enhanced.

  It is to be noted that, by appropriately combining any of the above-described various embodiments, the effects possessed by them can be produced.

  The paint mist collection device according to the present disclosure can increase the collection efficiency for the paint mist and at the same time reduce the cost of water used. Moreover, when a coating mist collection apparatus has an apparatus structure provided with an air conditioner, the air conditioning cost can be reduced. Therefore, it is useful as an apparatus that can improve the quality of the painting process of automobiles and home appliances and at the same time reduce the operating cost of the painting process.

DESCRIPTION OF SYMBOLS 1 Paint booth 2 Paint robot 3 Paint mist 4 Target object 5 Grating 6 Air-water intake 7 Paint mist collection device 8 Water tank 9 Water 10 1st water guide plate 11 Air flow 12 Water flow 13 Collection part 14 Blower 19 Discharge guide 23 Treated water tank 24 Baffle plate 25 Passage 26 Second water guide plate 27 Separator 28 Pump
30 Water supply device 31 Air passage 32 Collection chamber 40 Spiral passage 41 Wall member 42 Outer peripheral portion 43 Inner peripheral portion 44 Side wall member 45 Discharge port 46 Vertical passage portion 47 Bending portion 48 Restriction portion

Claims (4)

A collecting section that separates the coating mist from the coating mist-containing gas by passing the air passage through the air passage that passes the coating mist-containing gas sucked from the coating chamber together with water;
A water supply device for supplying water upstream of the collection unit;
A water guide plate having a gradient toward the air intake port that is the entrance of the air passage, and guiding water supplied from the water supply device to the air intake port;
A blower for exhausting the gas guided into the collection chamber through the collection section to the outside of the collection chamber,
The collection part
A spiral passage that is an air passage that swirls around a swivel axis that is disposed in the horizontal direction, with the upstream passage connected to the steam-water intake port as the outer peripheral side and the downstream passage as the central side;
A discharge passage that is connected to the downstream passage and is opened into the collection chamber in the direction of the pivot axis;
A paint mist collecting device, comprising: a constricted portion provided in a spiral passage and having a narrowed section of the passage. In the collecting part, the spiral passage is defined by a wall member arranged in a spiral around the pivot axis,
The wall member has an arcuate outer peripheral side portion serving as an outer peripheral side wall of the spiral passage, and an inner peripheral side portion disposed inside the outer peripheral side portion and serving as an inner peripheral side wall of the spiral passage,
The coating mist collection device according to claim 1, wherein a plurality of bent portions are provided as throttle portions on an inner peripheral side portion of the wall member.   The paint mist collection device according to claim 1 or 2, wherein a plurality of collection portions are arranged so that the discharge ports face each other.   The paint mist collection device according to any one of claims 1 to 3, wherein a connection portion to the air / water intake port extends in a vertical direction in the upstream side passage of the spiral passage.

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