JP6363024B2 - Flushing booth - Google Patents

Description

  The present invention relates to a water-washing paint booth that collects paint mist using water.

  In a painting booth that performs spray painting on an object to be painted, a surplus that does not adhere to the object to be painted occurs in the paint mist generated by spraying the paint.

  Therefore, in the painting booth, the wall located on the back side of the object to be painted is a water flow wall, and a part of the surplus paint mist is collected by the water film flowing down along the surface of the water flow wall. It is.

  In addition, excessive paint mist is dispersed (floating) in the booth air. In order to prevent the paint mist from being discharged to the outside, the booth air is sucked in by the exhaust device and sucked in the booth. Conventionally, the coating mist contained in the air is collected by being attached to water droplets such as a washing shower.

  As another means for recovering the paint mist, for example, water droplets adsorbing the paint mist are generated in the middle of the air exhaust passage containing the paint mist (coating agent mist) sucked by the exhaust device. A painting booth (water washing booth) having a structure including a water droplet generation unit and a cylindrical cyclone separation unit in order has been proposed (for example, see Patent Document 1).

  Furthermore, in the painting booth shown in Patent Document 1, water flowing from the water outlet provided at a location above the cyclone separation unit toward the water droplet generation unit is applied to the inner wall of the cylinder of the cyclone separation unit. It has been proposed to wash away water containing adhering paint mist.

JP 2011-88078 A

  However, in the one shown in Patent Document 1, the cyclone separating portion is a simple cylinder extending in the up-down direction, and the exhaust device is slightly smaller in diameter than the cylinder at a portion where the cylinder extends upward. It is only provided as an exhaust fan.

  In this configuration, only the vortex flow that is passively generated in association with the suction of air by the exhaust device can be used as an element for generating the swirl flow in the cyclone separation unit. It is difficult to increase.

  Therefore, even if the paint mist can be adsorbed to the water droplets in the one shown in Patent Document 1, the separation performance by centrifugal separation of the water droplets in the cyclone separation unit is not high, so the paint mist recovery performance is high. It is difficult to increase.

  Therefore, the present invention intends to provide a water-washing paint booth that can improve the recovery performance of paint mist.

In order to solve the above problems, the present invention comprises a painting booth body that performs painting work, and a wind exhauster that sucks air in the booth from the painting booth body, and the painting booth body and the exhaust fan An air duct for collecting the air in the booth guided from the painting booth main body, and a cyclone for flowing the air in the booth collected by the air duct as a swirling flow, and further, the air duct and the cyclone A water flow down device is provided for causing water to flow inside, and the cyclone has a cylindrical space formed between the outer cylinder and the inner cylinder, and air in the booth guided from the air duct is supplied to the space. It is assumed that a swirl flow is formed in the space by flowing from the direction along the tangential direction of the outer cylinder, and the water flow down device forms a water film flowing down along the inner wall of the outer cylinder of the cyclone. A function that, the rinsing painting booth having a function to flow down the column water flow space of the cyclone.

Further , the water flow down device has a function of forming a water film in the air duct and a function of flowing down a columnar water flow in the air duct.

  According to the washing / coating booth of the present invention, it is possible to improve the recovery performance of the coating mist.

It is a general | schematic cutting side view which shows 1st Embodiment of a water-washing painting booth. It is an AA direction arrow line view of FIG. It is a BB direction arrow line view of FIG. It is a top view which shows another structural example of an air duct as 2nd Embodiment of a water-washing painting booth. It is a general | schematic cutting top view which shows the application example of a water flow down apparatus. FIG. 5 is an enlarged view of the peripheral edge of the bottom of the water tank of the water flow down device of FIG. 5, (a), (b), and (c) are diagrams showing examples of support members disposed in the slits, and (d) is a slit. It is a figure which shows the example of the supporting member arrange | positioned above. It is a general | schematic cutting side view which shows the structural example in case a bottom part water tank is not provided with a cover.

  The water-washing painting booth of the present invention will be described with reference to the drawings.

[First Embodiment]
FIG. 1 is a schematic cut side view showing a first embodiment of a water washing painting booth. FIG. 2 is a view taken in the direction of arrows AA in FIG. FIG. 3 is a BB direction arrow view of FIG.

  As shown in FIG. 1, the water-washing painting booth according to the present embodiment includes a box-shaped painting booth main body 1 and a wind exhauster 3 for sucking in-booth air 2 in the painting booth main body 1. Between the painting booth body 1 and the exhaust fan 3, an air duct 4 for collecting the booth air 2 guided from the painting booth body 1 and a cyclone 5 for allowing the booth air 2 collected by the air duct 4 to flow in. With. Furthermore, the air duct 4 and the cyclone 5 are provided with a water flow down device 6 for flowing down the water 7 therein.

  The painting booth main body 1 is provided with a conveying means 8 such as a conveyor for conveying the coating object 9 in and out, and a spray means 10, and the painting object 9 conveyed into the painting booth main body 1 by the conveying means 8. On the other hand, it is comprised so that a coating operation can be implemented by spraying a coating material from the spray means 10.

  A water flow wall 11 is provided at a position on the back side of the painting object 9 in the painting booth main body 1 (the side opposite to the spray means 10).

  The water flow wall 11 is provided with a water flow wall water tank 12 and a guide plate 13 extending along the width direction of the water flow wall 11 in the vicinity of the upper end side of the surface exposed in the painting booth body 1. The guide plate 13 is disposed so as to guide the water 7 overflowed from the water flow wall water tank 12 to a position in contact with the upper end surface of the water flow wall 11. Between the guide plate 13 and the water flow wall 11, a gap (slit) for flowing down the water 7 along the surface of the water flow wall 11 is provided over the entire length of the water flow wall 11 in the width direction. . Thereby, the surface of the water flow wall 11 extends from the upper end side to the lower end when the water 7 guided by the guide plate 13 from the water flow wall water tank 12 flows down as a water film 7 a along the surface of the water flow wall 11. It is covered with a water film 7a.

  The painting booth body 1 includes a floor 14 formed by, for example, grating, and a bottom water tank 15 is provided below the floor 14.

  A gap 16 is provided between the lower end of the water flow wall 11 and the water surface 7 h of the water 7 stored in the bottom water tank 15. Thereby, the water 7 that has flowed down the surface of the water flow wall 11 as a water film 7 a falls to the water surface 7 h while forming the water curtain 7 b in the gap 16 and is received by the bottom water tank 15. This water curtain 7b is formed for the purpose of adsorbing and collecting the paint mist contained in the air 2 in the booth. Accordingly, the air in the booth body 2 of the painting booth body 1 with the suction of the exhaust fan 3 is provided on the back surface side of the water flow wall 11 (the side opposite to the side on which the water film 7a is formed) as will be described later. When guided to the duct 4, the booth air 2 passes through the gap 16 below the water flow wall 11 while being in contact with the water curtain 7b and the water surface 7h.

  The painting booth body 1 is further provided with an intake port 17 for sucking outside air. In the painting booth main body 1, the air inlet 17 is preferably provided at a position as far as possible from the gap 16, for example, at a position that is diagonally arranged with respect to the gap 16 as shown in FIG. 1. This is because the position of the intake port 17 is set at a location away from the gap 16, and the flow of air from the intake port 17 toward the gap 16 is formed in the entire internal space of the painting booth body 1, so that the air in the booth This is to prevent the partial retention of 2. It should be noted that the air inlet 17 may be disposed at a position other than the position shown in FIG. 1 as long as the air flow from the air inlet 17 toward the gap 16 can be formed in the entire interior space of the painting booth body 1. is there.

  As shown in FIGS. 1 and 2, the air duct 4 includes a longitudinal channel 18 extending in the vertical direction on the back surface side of the water flow wall 11 and having a width dimension similar to the width dimension of the water flow wall 11, and a longitudinal channel 18. It is set as the structure provided with the horizontal direction flow path 19 extended in a horizontal direction from the upper end part of this to the opposite side to the water flow wall 11 side.

  As shown in FIG. 2, the horizontal flow path 19 has a flow path width similar to that of the vertical flow path 18 at the upstream end in the air flow direction of the booth air 2, and goes downstream in the air flow direction. As it goes, it has a planar shape in which the channel width is gradually reduced. This is formed by gradually narrowing the interval between the walls 19a, 19b on both sides in the flow path width direction. The downstream end of the lateral flow path 19 in the air flow direction is connected to the cyclone 5.

  As a result, in the air duct 4, the booth air 2 guided from the coating booth main body 1 through the gap 16 as described above flows into the vertical flow path 18 from the lower end side, and flows upward in the vertical flow path 18. After that, it flows into the lateral flow path 19. In the lateral flow path 19, the flow path width is reduced in a plane as it goes downstream in the air flow direction, and the flow path cross-sectional area is reduced, so that the flow velocity of the booth air 2 is increased. Therefore, the air duct 4 can flow into the cyclone 5 after collecting the in-booth air 2 guided from the painting booth main body 1 and increasing the flow velocity.

  The four walls 18a, 18b, 18c, 18d of the longitudinal channel 18 and the walls 19a, 19b of the lateral channel 19 are preferably vertical wall surfaces. This is for facilitating formation of a water film 7c described later on the inner surfaces of the walls 18a to 18d, 19a, 19b. Therefore, depending on the wettability of the inner surfaces of the walls 18a to 18d, 19a, and 19b, the walls 18a to 18d, 19a, and so on are within the range in which the water film 7c can flow down along the inner surfaces. 19b may be inclined from the vertical direction.

  Moreover, it is preferable that the ceiling wall 20 of the vertical direction flow path 18 and the horizontal direction flow path 19 in the air duct 4 is horizontal as shown in FIG. As will be described later, this is because the water depth in the water tank 21 of the water flow down device 6 provided on the upper side of the ceiling wall 20 is uniform, and the water pressure applied to the water 7 flowing down from the water tank 21 is uneven. This is to prevent it from becoming. Therefore, the ceiling wall 20 of the air duct 4 is not necessarily completely horizontal if the difference in water pressure applied to the water 7 to be flowed down from the water tank 21 by the water flow down device 6 is within a preset allowable range. Also good.

  The lower end wall 19c of the lateral flow path 19 is preferably horizontal as shown in FIG. As will be described later, this is because the water film 7c flowing down along the walls 19a and 19b of the lateral flow channel 19 and the water 7 of the columnar water flow 7d flowing down in the horizontal flow channel 19 are converted into the lower end wall 19c. This is for forming the water film 7e so as to spread over the entire surface on the upper side. Furthermore, it is also an object to allow the water 7 forming the water film 7e to flow into both the longitudinal flow path 18 and the cyclone 5. The lateral flow path 19 is within a range in which the formation of the water film 7e and the flow of the water 7 having the water film 7e into the longitudinal flow path 18 and the cyclone 5 can be performed. The lower end wall 19c does not necessarily have to be completely horizontal.

  The cyclone 5 includes an outer cylinder 22, a conical part 23 provided on the lower end side of the outer cylinder 22, a discharge pipe 24 connected to the lower end of the conical part 23, and a ceiling wall 25 that closes the upper end side of the outer cylinder 22. And an inner cylinder 26 that is inserted and arranged concentrically from above at the center of the outer cylinder 22 through the center of the ceiling wall 25.

  As shown in FIG. 2, the outer cylinder 22 is provided with an inlet 27 that communicates in the inner and outer directions at one place in the circumferential direction on the upper end side. The downstream end of the lateral flow path 19 of the air duct 4 is connected to the inlet 27 from the direction along the tangent line of the outer cylinder 22.

  The upper end side of the inner cylinder 26 protruding upward from the ceiling wall 25 is connected to the suction port 3 a of the exhaust fan 3.

  The lower end side of the discharge pipe 24 is disposed so as to be immersed in the water 7 stored in the bottom water tank 15.

  The ceiling wall 25 of the cyclone 5 is integrally connected to the ceiling wall 20 of the air duct 4.

  As a result, in the cyclone 5, the air in the booth 2 in the state in which the flow velocity is increased in the lateral flow path 19 of the air duct 4 as described above with the suction of the exhaust fan 3 is transferred from the inlet 27 to the outer cylinder 22. It flows into a cylindrical (ring-shaped) space 28 between the inner cylinders 26 in a direction along the tangential direction of the outer cylinder 22. For this reason, in the space 28, a swirl flow of the booth air 2 that is gradually downward from the upper end side where the inlet 27 is provided is forcibly formed.

  Due to this swirl flow, in the space 28, the coating mist contained in the booth air 2 and the booth air 2 flowing into the cyclone 5 through the air duct 4 as will be described later are floated to adsorb the coating mist. The water droplets (not shown) used are centrifuged based on the density difference from the air. For convenience of explanation, hereinafter, the coating mist and the water droplets to be subjected to the centrifugal separation process in the cyclone 5 are collectively referred to as coating mists.

  The air 2 in the booth after being subjected to the centrifugal separation process flows into the inner cylinder 26 from the lower end side of the inner cylinder 26, and is guided to the exhaust fan 3 through the inner cylinder 26. On the other hand, the coating mist separated from the booth air 2 by the centrifugal separation process is collected on the inner wall of the outer cylinder 22 that is the outer peripheral portion of the space 28. Since a water film 7f is formed on the inner wall of the outer cylinder 22 by a water flow device 6 described later, the collected coating mist is collected by adsorption by the water film 7f.

  As shown in FIG. 1, the water flow down device 6 is provided with a water tank 21 on the upper side of an integral part of the ceiling wall 20 of the air duct 4 and the ceiling wall 25 of the cyclone 5. As shown in FIG. 3, slits 29 are provided discontinuously at positions along the periphery of the ceiling wall 20 and the ceiling wall 25 that are the bottom of the water tank 21. A connecting member 30 that connects the inner peripheral side and the outer peripheral side of the slit 29 is provided between the adjacent slits 29. The width of the connecting member 30 is set so that the water 7 that has passed through the slits 29 on both sides of the connecting member 30 joins below the connecting member 30. Thus, water films 7c and 7f connected in the circumferential direction are formed below the slits 29.

  Further, as shown in FIG. 3, the ceiling wall 20 of the air duct 4 is located at a plurality of positions above the vertical flow path 18 and toward the downstream in the air flow direction where the flow width of the horizontal flow path 19 is narrowed. Water flow down holes 31 for allowing water 7 to flow down as columnar water flow 7d (see FIG. 2) are formed in a plurality of positions above the points in the vertical direction.

  Further, water flow down holes 32 are provided on the ceiling wall 25 of the cyclone 5 in the vertical direction to allow the water 7 to flow down as a columnar water flow 7g (see FIG. 2) at a plurality of circumferential locations, for example, 8 locations in FIG. It has been drilled.

  The water flow holes 32 in the ceiling wall 25 are arranged along the circumferential direction at a radial position that is equidistant from the outer cylinder 22 and the inner cylinder 26 or at a radial position that is closer to the center. It is preferable that This is due to the following reason.

  That is, in the space 28, the centrifugal force that acts on the coating mists in the swirling flow of the booth air 2 increases as it goes closer to the outer periphery. Therefore, the coating mists are separated with high efficiency from the in-booth air 2 passing through a region where a large centrifugal force acts on the coating mists near the outer periphery of the space 28.

  On the other hand, the centrifugal force acting on the coating mists becomes weaker toward the inner cylinder 26 (center side). Therefore, the coating mist contained in the booth air 2 passing through the region where the centrifugal force acting on the coating mist is relatively weak has a low separation efficiency due to centrifugal separation. Therefore, the coating mist contained in the booth air 2 passing through the region where the centrifugal force acting on the coating mist is relatively weak is collected by contact with the columnar water flow 7 g flowing down from each water flow hole 32. By doing so, the separation efficiency from the booth air 2 is increased.

  As shown in FIG. 1, a water supply line 33 with a circulation pump 34 that circulates and supplies the water 7 in the bottom water tank 15 is connected to the water tank 21. As shown in FIG. 1, the water supply line 33 may include a branch line 33 a that branches downstream from the circulation pump 34, and the branch line 33 a may be connected to the water flow wall water tank 12. According to this configuration, the water tank 21 and the water flow wall water tank 12 can share the circulation pump 34 for circulating and supplying the water 7, which is suitable for reducing the number of devices.

  Further, in the case of this configuration, the amount of water 7 supplied to the water tank 21 and the water flow wall water tank 12 is individually adjusted to a position downstream of the branching point in the water supply line 33 and the branch line 33a. What is necessary is just to each provide the flow volume adjustment means which is not shown in figure like a flow volume adjustment valve.

  A water treatment means (not shown) is provided at a position upstream of the circulation pump 34 in the water supply line 33. Thus, when the water 7 in the bottom water tank 15 is circulated and supplied to the water tank 21 or the water flow wall water tank 12, the coating mist and other contaminants mixed in the water 7 are previously removed by the water treatment means. It is.

  Furthermore, a cover 35 for airtightly covering the upper part of the bottom water tank 15 is provided on the back surface side of the water flow wall 11.

  The air duct 4, the cyclone 5, and the water tank 21 are installed in the cover 35. For this reason, the inner cylinder 26 of the cyclone 5 is disposed so that the upper end portion penetrates the water tank 21 and the cover 35 in the vertical direction, and is discharged to the upper end side of the inner cylinder 26 exposed to the outside of the cover 35. The wind machine 3 is connected.

  Of course, the cover 35 does not have to have a height that covers all of the air duct 4, the cyclone 5, and the water tank 21 as long as the cover 35 can be airtightly covered above the bottom water tank 15. For example, as indicated by a two-dot chain line in FIG. 1, the height of the cover 35 may be set lower than that of the air duct 4 or the cyclone 5. In this case, the longitudinal flow path 18 of the air duct 4 and the discharge pipe 24 of the cyclone 5 may be configured to penetrate the cover 35 in the vertical direction.

  Since the water 7 in the bottom water tank 15 is mixed with coating mist and other contaminants, volatile components may be volatilized and odor may be generated. However, in the configuration including the cover 35, the water 7 in the bottom water tank 15 It is possible to prevent the odor from spreading to the surrounding environment. Furthermore, when deodorization is required for the booth air 2 discharged from the water-washing paint booth of the present embodiment, a deodorizing device (not shown) is provided on the downstream side of the discharge port 3b of the blower 3, and the booth air 2 What is necessary is just to perform a deodorizing process.

  Reference numeral 36 in FIG. 1 is a lid for closing the upper end side of the water tank 21.

  When the water flow down device 6 having the above configuration operates the circulation pump 34 and continuously supplies the water 7 to the water tank 21, the water 7 in the water tank 21 passes through the slit 29 and the water flow down holes 31 and 32. Be flowed down.

  Thus, in the air duct 4, the water 7 flowing down from the slit 29 causes the water to flow down to the walls 18 a, 18 b, 18 c in the vertical flow path 18 and the wall surfaces of the walls 19 a, 19 b in the horizontal flow path 19. A film 7c is formed.

  Further, in the air duct 4, a plurality of columnar water streams 7 d that flow down are formed in the longitudinal flow path 18 and downstream of the lateral flow path 19 by the water 7 flowing down through the respective water flow lower holes 31. Further, in the lateral flow path 19, a water film 7e is formed on the upper side of the lower end wall 19c by the water 7 flowing down as the water film 7c through the walls 19a and 19b and the water 7 flowing down as the columnar water flow 7d. Is done. Thereafter, the water 7 having formed the water film 7e flows into the longitudinal flow path 18, whereby the water film 7c that flows down to the wall surface of the wall 18d is formed.

  Therefore, the air duct 4 is in a state where all inner surfaces except the lower surface of the ceiling wall 20 are covered with the flowing water films 7c and 7e.

  As described above, the water film 7c flowing down along the walls of the walls 18a to 18d of the vertical flow path 18 and the plurality of columnar water flows 7d flowing down in the vertical flow path 18 are formed in the vertical flow path 18. After passing, it falls to the bottom water tank 15.

  In the cyclone 5, a water film 7 f that flows down is formed by water 7 flowing down from the slit 29 at a location other than the inlet 27 on the inner wall of the outer cylinder 22.

  Further, in the cyclone 5, the water 7 of the water film 7 e formed on the lower end wall 19 c of the lateral flow path 19 flows from the air duct 4 through the inlet 27, thereby lowering the inlet 27 on the inner wall of the outer cylinder 22. A water film 7f that flows down is also formed at this point.

  Accordingly, the outer cylinder 22 of the cyclone 5 is in a state where the inner wall is entirely covered with the water film 7f that flows down.

  In the cyclone 5, a plurality of columnar water streams 7 g that flow down are formed in the space 28 between the outer cylinder 22 and the inner cylinder 26 by the water 7 flowing down through the respective water flow holes 32.

  The water film 7 f flowing down the inner wall of the outer cylinder 22 and the water 7 of each columnar water flow 7 g are received by the conical portion 23 and merged, and then returned to the bottom water tank 15 through the discharge pipe 24.

  When using the water-washing paint booth of the present embodiment having the above-described configuration, first, water 7 is continuously supplied to the water flow wall water tank 12 and the water tank 21 of the water flow down device 6 by the operation of the circulation pump 34. To do.

  Thereby, in the painting booth main body 1, a water film 7 a that flows down is formed on the wall surface of the water flow wall 11.

  Further, the water flow down device 6 causes the air duct 4 to flow along the walls 18a to 18d of the longitudinal flow path 18 and the walls 19a and 19b of the lateral flow path 19 and the lateral flow. A water film 7e that covers the lower end wall 19c of the channel 19 and a plurality of columnar water streams 7d that flow down in the longitudinal channel 18 and the lateral channel 19 are formed.

  Further, the water flow down device 6 forms a water film 7 f flowing down along the inner wall of the outer cylinder 22 and a columnar water flow 7 g flowing down in the space 28 for the cyclone 5.

  Next, after the operation of the exhaust fan 3 is started, the painting work for the painting object 9 by the spray means 10 is started in the painting booth body 1.

  Thereby, a part of the surplus coating mist that does not adhere to the coating object 9 out of the coating mist sprayed from the spray means 10 is adsorbed and collected by the water film 7a flowing down the water flow wall 11, and this water It falls to the bottom water tank 15 together with the membrane 7a.

  Further, the booth air 2 containing the excessive coating mist that is not collected by the water flow wall 11 is sucked from the coating booth body 1 through the gap 16 between the water flow wall 11 and the bottom water tank 15 by the suction action of the exhaust fan 3. It is guided to the duct 4 and then to the cyclone 5.

  When the booth air 2 passes through the gap 16, the water curtain 7b and the water surface 7h formed in the gap 16 come into contact with each other, so that the paint mist contained in the booth air 2 is adsorbed by the water curtain 7b and the water surface 7h. Collection is performed. The paint mist collected by the water curtain 7b falls into the bottom tank 15 together with the water curtain 7b.

  Further, when the booth air 2 passes through the gap 16, the splash generated from the water curtain 7b due to the flow of the booth air 2 or a part of the splash generated on the water surface 7h due to the fall of the water curtain 7b is generated in the booth. It becomes water droplets (not shown) accompanying the flow of the air 2. The water droplets adsorb the paint mist while floating in the booth air 2.

  In the air duct 4, the booth air 2 first circulates in the vertical flow path 18 and then flows in the horizontal flow path 19.

  When the booth air 2 flows upward in the longitudinal flow path 18, a water film 7 c that flows down along the walls 18 a to 18 d and a plurality of columnar shapes that flow down in the vertical flow path 18 with respect to the booth air 2. The water flow 7d comes into contact as a counter flow. For this reason, in the vertical direction flow path 18, adsorption | suction and collection by the water film 7c of the coating mist and each columnar water flow 7d which are contained in the air 2 in a booth are performed. The coating mist collected by the water film 7c and each columnar water flow 7d in the longitudinal channel 18 falls to the bottom water tank 15 together with the water film 7c and each columnar water flow 7d.

  Furthermore, in the longitudinal flow path 18, a part of the splashes generated from the respective columnar water streams 7d due to the flow of the booth air 2 and a part of the splashes generated when the water film 7c and each columnar water stream 7d fall on the water surface 7h. However, it becomes water droplets (not shown) accompanying the flow of the air 2 in the booth. The paint mist contained in the booth air 2 is also adsorbed by these water droplets.

  When the booth air 2 flows through the lateral flow path 19, the booth air 2 has a water film 7 c that flows down along the walls 19 a and 19 b arranged so as to gradually reduce the flow path width, and a lower end wall. The water film 7e formed on the upper side of 19c comes into contact with the columnar water flow 7d falling at the portion where the channel width of the lateral channel 19 is narrowed. For this reason, in the horizontal flow path 19, adsorption | suction and collection by the water film 7c and the water film 7e of the coating mist contained in the booth air 2 and each columnar water flow 7d are performed. The coating mist collected by the water film 7c, the water film 7e, and each columnar water stream 7d in the horizontal flow path 19 is vertically aligned with the water 7 that formed the water film 7c, the water film 7e, and each columnar water stream 7d. It is processed in the same manner as the coating mist that flows into the directional flow path 18 and the cyclone 5 and is then adsorbed and collected by the vertical flow path 18 and the cyclone 5.

  Further, in the lateral flow path 19, splashes generated from the respective columnar water streams 7 d due to the flow of the booth air 2, and a part of the splashes generated at the places where the respective columnar water streams 7 d fall into the flow of the booth air 2. It becomes accompanying water droplets (not shown). The paint mist contained in the booth air 2 is also adsorbed by these water droplets.

  When the booth air 2 flows through the lateral flow path 19, the flow velocity is increased according to the change in the cross-sectional area of the horizontal flow path 19, and the cyclone 5 has a booth in a state where the flow velocity is increased. The internal air 2 is forced to flow from the inlet 27 into the space 28 so as to form a swirl flow.

  Thereby, in the cyclone 5, the centrifugal separation process of the coating mist (paint mist and water droplets) contained in the air 2 in the booth that becomes a swirling flow in the space 28 is performed. The coating mist separated from the booth air 2 by this centrifugal separation is collected on the inner wall of the outer cylinder 22, and is adsorbed and collected by the water film 7f flowing down there.

  Further, in the space 28 of the cyclone 5, the booth air 2 that passes through the region where the centrifugal force acting on the coating mists is relatively weak due to the swirling flow of the booth air 2 near the inner cylinder 26 is converted into each columnar water flow 7g. Since it comes into contact, the coating mist contained in the booth air 2 passing through this region is adsorbed and collected by each columnar water flow 7g.

  The coating mist collected by the water film 7f and each columnar water flow 7g in the cyclone 5 is the bottom water tank through the conical portion 23 and the discharge pipe 24 together with the water 7 that formed the water film 7f and each columnar water flow 7g. Fall to 15.

  Thereafter, the cleaned booth air 2 after the collection of the paint mist and the paint mists by the gap 16, the air duct 4 and the cyclone 5 as described above is guided to the exhaust fan 3, It is discharged to the outside through the discharge port 3b.

  Thus, according to the water-washing painting booth of the present embodiment, the booth air 2 of the painting booth main body 1 increases the flow velocity by passing the air duct 4 and then enters the outer cylinder 22 of the cyclone 5. Since it is made to flow from the direction along the tangential direction, the swirl flow of the booth air 2 can be forcibly generated in the space 28 of the cyclone 5.

  For this reason, the separation efficiency which centrifuges coating mist from the air 2 in the booth in the cyclone 5 can be made high.

  Further, in the cyclone 5, the booth air 2 that circulates in a region where the centrifugal force acting on the coating mist is relatively weak near the inner cylinder 26 in the space 28 is brought into contact with the columnar water flow 7 g that flows down to the space 28. Therefore, the efficiency of adsorption and collection of paint mists can be increased.

  Further, in the air duct 4, the circulating booth air 2 is in contact with each columnar water flow 7d to flow down in addition to the water films 7c and 7e along the walls 18a to 18d, 19a, 19b and 19c. The efficiency of adsorption and collection of paint mist can be increased.

  The coating mist and the coating mists collected with high efficiency by the water films 7a, 7c, 7e, 7f and the columnar water streams 7d, 7g in the water flow wall 11, the air duct 4 and the cyclone 5 as described above are all bottom water tanks. 15 is recovered with water 7.

  Therefore, according to the water-washing painting booth of the present embodiment, it is possible to improve the recovery performance of the coating mist from the air 2 in the booth.

  The air duct 4 is configured so that the entire inner surface except the lower surface of the ceiling wall 20 is covered with water films 7c and 7e. The coating mist adsorbed and collected by the water films 7c and 7e is the water film 7c. , 7e together with the bottom water tank 15. For this reason, it can suppress that coating mist adheres and accumulates in the air duct 4 used as the path | route which guides the air 2 in a booth from the coating booth main body 1 to the cyclone 5. FIG.

[Second Embodiment]
FIG. 4 shows a modification of the air duct as a second embodiment of the water-washing painting booth.

  4 that are the same as those shown in FIGS. 1 to 3 are marked with the same symbols and descriptions of them will be omitted.

  The air duct 4 in the present embodiment has the same configuration as that shown in FIGS. 1 to 3, and the walls 19 a and 19 b on both sides in the channel width direction of the lateral channel 19 are connected from the upstream side to the downstream side in the air flow direction. Instead of a configuration that extends linearly to the wall, the walls 19a and 19b on both sides of the lateral channel 19 in the channel width direction are smooth from the upstream side to the downstream side in the air flow direction as shown in FIG. It is set as the structure provided with the planar shape drawn by the continuous curve.

  Other configurations are the same as those shown in FIGS.

  According to the present embodiment, in the lateral flow path 19 of the air duct 4, the flow path width is reduced from the upstream side to the downstream side in the air flow direction by the walls 19a and 19b, and the flow path cross-sectional area is reduced. Sometimes the flow path width changes continuously. Therefore, in the lateral flow path 19, the booth air 2 guided from the vertical flow path 18 can be collected and flowed into the cyclone 5 more smoothly while increasing the flow velocity.

  The present invention is not limited to each of the embodiments described above. In the cylindrical space 28 of the cyclone 5, the position and number of the column-like water flow 7 g to be flowed down by the water flow-down device 6 are not shown. It is good also as a position and a number.

  The position and number at which the column-like water flow 7d is caused to flow down by the water flow down device 6 in the air duct 4 may be other than the positions and numbers shown in the figure.

  The water flow down device 6 preferably has both the function of flowing down the columnar water flow 7d in the air duct 4 and the function of flowing down the columnar water flow 7g in the cyclone 5, but either one may be omitted.

  You may change suitably the vertical dimension of the air duct 4, and the dimension of a flow-path width direction according to the dimension of the coating booth main body 1, the dimension of cyclone 5, and arrangement | positioning.

  The water flow down device 6 may form a water flow that flows intermittently in either one or both of the air duct 4 and the cyclone 5 instead of the columnar water flow 7d and 7g.

  In FIG. 3, the ceiling wall 20 and the ceiling wall 25 of the air duct 4 and the cyclone 5 have a configuration in which slits 29 are discontinuously provided at positions along the periphery, but as shown in FIG. 5, A configuration in which the continuous slits 29 are provided and the ceiling wall 20 and the ceiling wall 25 are supported and fixed via support members 37 arranged at a plurality of locations in the circumferential direction from the outer peripheral side of the slits 29 may be employed.

  When the support member 37 is arranged in the slit 29, the cross-sectional shape is such that the water 7 flowing down through the both sides of the support member 37 at the slit 29 quickly merges below the support member 37. May be provided. For example, the support member 37 may have a pin shape as shown in FIG. 6 (a), a flat plate shape along the vertical direction as shown in FIG. 6 (b), or a lower portion as shown in FIG. 6 (c). What is necessary is just to provide the cross-sectional shape which has a lower end part which becomes thin toward it. 6A, 6 </ b> B, and 6 </ b> C indicate the flow of water 7 that passes through the slit 29 around the support member 37.

  Further, the support member 37 is not disposed in the slit 29 but is disposed so as to straddle the upper portion of the slit 29 as shown in FIG. 6 (d), and the ceiling wall 20 and the ceiling wall 25 are suspended from above. It is good also as a structure supported and fixed to. According to this configuration, the water 7 can flow from the slit 29 without interruption in the circumferential direction.

  The bottom water tank 15 is preferably provided with a cover 35. However, when the odor diffusion from the water 7 of the bottom water tank 15 to the surrounding environment is not particularly problematic, it is necessary to provide a deodorizing apparatus for each washing washing booth of the present embodiment. If there is no cover, the cover 35 may be omitted as shown in FIG. In this case, of the four walls 18a, 18b, 18c, and 18d (see FIG. 2) in the longitudinal flow path 18 of the air duct 4, the three walls 18b, 18c, and 18d that are not in contact with the water flow wall 11 are used. As a configuration in which the lower end side is immersed in the water 7 of the bottom water tank 15, only the in-booth air 2 guided from the painting booth body 1 may flow into the air duct 4.

  Of course, various modifications can be made without departing from the scope of the present invention.

DESCRIPTION OF SYMBOLS 1 Paint booth body 2 Air in booth 3 Air exhauster 4 Air duct 5 Cyclone 6 Water flow down device 7c Water film 7d Columnar water flow 7e Water film 7f Water film 7g Columnar water flow 22 Outer cylinder 26 Inner cylinder 28 Space

Claims (2)

The painting booth body that performs painting work,
An exhaust fan for sucking air in the booth from the painting booth body,
And between the painting booth body and the exhaust fan,
An air duct for collecting the air in the booth guided from the painting booth body;
A cyclone that allows the air in the booth collected by the air duct to flow as a swirling flow;
Furthermore, a water flow down device for flowing down the water inside the air duct and cyclone ,
The cyclone includes a cylindrical space formed between an outer cylinder and an inner cylinder, and allows the booth air guided from the air duct to flow into the space from a direction along a tangential direction of the outer cylinder. To form a swirling flow in the space,
The water flow down device is
A function of forming a water film flowing down along the inner wall of the outer cylinder of the cyclone;
Washing paint booth, wherein Rukoto a function to flow down the column water flow space of the cyclone. The water flow down device is
A function of forming a water film in the air duct;
Washing painting booth according to claim 1, characterized in that it comprises a function to flow down the column flow in the air duct.

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