JP2015016429A - Dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a dust collector which captures and removes an object to be dust-collected, such as coating mist, using wettability of foam.SOLUTION: A dust collector comprises a lower water tank 1, a mist removal mechanism 2 which removes mist by bringing a mist-containing suction discharge flow F with foam D, and an exhaust mechanism 3 which discharges gas from a back space of the mist removal mechanism 2 to generate the suction discharge flow F. The mist removal mechanism 2 includes a foam generation part 21 which generates and supplies a foam liquid D having fluidity, a collision plate part 22 which is provided with a collision surface with which the suction discharge flow F collides and a passage allowing the suction discharge flow F to pass therethrough to the back side after the collision and along which the foam liquid D supplied from the foam generation part 21 flows down, a foam block plate 23 which is bored with many small holes and arranged on back side of the collision plate part 22, and a shower part 24 which sprays shower water E to the surface of the foam block plate 23.

Description

  TECHNICAL FIELD The present invention relates to a dust collector for sucking and purifying a gas to be treated such as a painting booth that mainly performs spray painting work.

  For example, at the time of spray coating work, the sprayed paint is sprayed on the object to be coated, and when the object to be coated is applied, the sprayed paint that does not adhere to the object to be coated (paint mist: paint or organic solvent) In order to prevent the paint mist from being discharged to the outside in the scattered state, it is necessary to capture and collect the paint mist. The paint mist is captured and collected over a wide range rather than local suction, and parallel suction is performed. The suction / discharge flow is performed at a wind speed of about 0.4 to 0.6 m / sec.

  Specifically, there is a dust collector called a flush-type paint booth disclosed in Patent Document 1, the device is provided with a water flow plate on the front surface (opposite surface of spray spray) of the painting work location, Water is made to flow down on the water flow plate to form a water curtain, and the suction discharge flow descends along the water curtain, and the paint mist that has come into contact with the water is knocked down into the lower water tank together with the water flow, and further the exhaust flow path A water shower is provided on the way to capture floating paint mist. Furthermore, a means is also known in which a filter is disposed in the exhaust passage and the paint mist is captured by the filter.

  Various dust collectors using bubbles have also been proposed. For example, Patent Document 2 discloses a dust collecting means that uses foam that causes a foam flow to collide with a foam generation plate that generates foam by using a foam generation liquid, attaches the dust to the foam, and drops it to the foam reservoir. However, it is difficult to generate bubbles due to the suction discharge flow with a low speed discharge flow by suction discharge from a wide range like a painting booth, and bubbles are generated separately to supply bubbles to the mesh surface (punched metal surface) Even in the case of adopting a means to do so, it is difficult for sugar to pass through the bubble surface in the case of a low-speed discharge flow, and it cannot be applied as a dust collector for a painting booth.

  As a dust collector capable of handling a paint booth that uses foam, Patent Document 3 provides a microbubble generator and a stirring mechanism in the middle of the exhaust flow path of the paint mist, and attaches the paint mist to the microbubble and captures it. Means are disclosed.

Japanese Patent Laid-Open No. 2008-188532, FIG. JP-A-7-68117. Utility model registration No. 3152129.

  As a dust collection that can handle a suction exhaust flow from a wide range, as disclosed in Patent Document 1, a means for capturing a scattered paint mist moving on an exhaust flow with a water curtain, The probability of contact with the water curtain is not necessarily high, and the suction discharge flow often flows on the surface of the water curtain in a non-contact state with water, so that the efficiency of capturing the paint mist is poor.

  In addition, when using a water shower, there is a problem that the paint mist that does not come into contact with water cannot be captured when using a water shower. When a filter is used, a fine filter is used to increase the capture efficiency. Of course, it is necessary to use an exhaust fan with a strong exhaust capacity, which is not efficient.

  In addition, the means for capturing the paint mist by adopting micro bubbles instead of the water shower in the exhaust flow path is a micro bubble (foam) that sucks the exhaust flow containing the paint mist from below by the upper exhaust fan and sprays it. The coating mist adhering to the microbubbles is suppressed by suppressing the exhaust flow of the coating mist rising due to the fall of the fine water particles).

  For this reason, if the exhaust capacity is increased, the paint mist adheres to the microbubbles and flows along with the exhaust flow. Therefore, the microbubbles repeatedly collide and collide to some extent in a predetermined space, and have a corresponding size. If the exhaust capacity is lowered in order to drop it as water particles, the paint mist suction in the painting work space (paint mist generation source) is not performed smoothly, so the exhaust flow discharge capacity and the amount of microbubbles generated There arises a problem that the control of is complicated.

  Accordingly, the present invention provides a dust collector capable of reliably capturing paint mist and the like in a painting work space by performing suction and discharge from a wide range and capturing the paint mist and the like by bubbles having a large contact area with the discharge flow. Is proposed.

  The dust collector according to the present invention (Claim 1) includes a lower water tank for receiving a foam liquid (meaning a foam having a high content of non-foamed moisture in addition to foam and having fluidity), and a suction containing mist. A dust collector comprising a mist removal mechanism that removes mist by bringing the exhaust flow into contact with bubbles, and an exhaust mechanism that discharges mist removal gas from the back space of the mist removal mechanism to create a suction discharge flow. The mist removing mechanism section provides a foam generating section that generates and supplies a foam liquid having fluidity, a collision surface on which the suction / discharge flow collides, and a passage that allows passage through the rear after the collision. A collision plate part in which the foam liquid supplied from the part flows down, a foam prevention plate having a large number of small holes formed on the back surface of the collision plate part, and a shower part for showering the surface of the foam prevention plate with shower water It is characterized by this.

  Thus, when the exhaust mechanism is operated, the back space of the mist removing mechanism becomes negative pressure, and the processing target gas (mist-containing gas) is sucked from a wide range on the front side of the mist removing mechanism. At this time, when foam liquid is generated in the foam generating part and supplied to the collision plate part, the foam liquid slowly flows down the surface of the collision plate part (as a guideline, 10 cm / second), and the gas to be processed becomes a slow suction discharge flow. It collides with the collision surface of the collision plate part, changes the direction of the airflow after the collision, passes through a predetermined passage, and flows behind the collision plate part. Therefore, since the suction discharge flow comes into contact with the falling foam liquid, mist adheres to the surface of the foam, and the mist flows down to the lower water tank together with the foam liquid.

  In particular, when the amount of foam liquid is small and the amount of foam is large, the fluidity is low and the entire foam covers the entire front surface of the collision plate, and the passage of the collision plate is also blocked, and the suction discharge flow is removed by mist. The mechanism cannot be removed, and the mist removal efficiency is reduced. Conversely, if the amount of liquid is large and the amount of foam is small, the fluidity is large and the passage is not blocked, but mist adherence to the foam is reduced and mist removal efficiency is deteriorated. When the amount of foam and fluidity are taken into account, as described above, a foam liquid having an appropriate specific gravity is generated so that the flow-down speed is about 10 cm / second.

  Mist is attached to the foam at the collision plate, and it flows down to the lower water tank to remove the mist, but if the amount of foam is increased so that the mist adheres sufficiently, naturally part of the foam will float in the air Then, a part of the foam with the mist adheres to the suction discharge flow, passes through the passage of the collision plate portion, and flows behind the collision plate portion. Gases other than bubbles in the suction discharge flow reach the back space through the small holes, and the bubbles attached with mist cannot pass through the small holes, collide with the bubble blocking plates, adhere to the bubble blocking plates, and It will flow down to the lower tank with shower water.

  Therefore, the gas to be treated, including sprayed paint (paint mist) that does not adhere to the object to be coated in the painting operation, becomes a suction discharge flow and comes into contact with the foam at the collision plate portion, and the mist in the gas is foamed. The bubbles attached to the mist flow down the surface of the collision plate, and the bubbles attached to the mist scattered in the air adhere to the bubble prevention plate and flow down with shower water, behind the mist removing mechanism. Is a suction exhaust flow from which mist is removed and flows into the outside air.

  In addition, the dust collector according to the present invention (Claim 2) is formed by forming a foam liquid flow lower guide uneven surface on the collision surface of the collision plate portion, and the foam liquid flow has a converging property. However, the above-described guide causes the foam liquid flow to flow down the entire collision surface without being biased, and prevents the mist adhesion efficiency from being lowered.

  In the dust collector according to the present invention (Claim 3), the collision plate portion is formed by arranging the flat and flat U-shaped plate bodies so that the front and back are alternately meshed with each other at appropriate intervals. As a passage, the treatment airflow collides with the front plate and the rear plate and flows laterally, passes between the edge plates of the front and rear plates and flows behind the collision plate part, and the treatment airflow and the bubble are sure to contact each other. It is to be made.

  The present invention is as described above. In the dust collecting means for removing the mist by bringing the gas to be treated including the coating mist and the like into contact with the foam and attaching the mist to the foam, the collision contact with the falling foam liquid and the floating foam By adopting a combination of flow down by water shower, a dust collector capable of removing most of the paint mist containing the volatile organic solvent from the exhaust flow sucked from a wide range is realized.

1 is an overall explanatory diagram of an embodiment of the present invention. The partial perspective view of the principal part (mist removal mechanism part). The partial cross section figure (plan view) of the collision board. Action | operation explanatory drawing (plan view sectional drawing) of the principal part (mist removal mechanism part).

  Next, an embodiment of the present invention will be described. The illustrated dust collecting apparatus is installed in a painting booth that paints a painting object A with a paint sprayer B, and constitutes a main body box 1 with a front opening or a sealed space with a predetermined front opening, and a lower water tank. 1. A mist removing mechanism 2 and an exhaust mechanism 3 are incorporated.

  The lower water tank 1 occupies the entire area below the mist removing mechanism section 2 and the exhaust mechanism section 3 and receives the coating mist, and is provided with a forcibly discharging paint sludge for sedimentation as required.

  The mist removing mechanism unit 2 includes a bubble generation unit 21, a collision plate unit 22, a bubble prevention plate 23, and a shower unit 24. The foam generating unit 21 includes a foam generating liquid mixed with a surfactant, an air supply unit necessary for generating foam, and a stirring unit. The foam generating liquid 21 has a predetermined fluidity (about 28 g / L) D. And flow down from the discharge cylinder 211 to the collision surface 221 of the collision plate of the lower collision plate portion 22.

  The collision plate portion 22 has a plurality of flat, flat, U-shaped plates that are bent in the front-rear direction on the left and right edges of the collision surface 221 so that the bent edges 222 mesh with each other at appropriate intervals. The part is formed in the passage 223 to the back so that the parallel suction from a wide range corresponding to the painting booth is performed, and provided up to the water surface of the collected water C in the lower water tank 1 or below the water surface. Yes. Further, the impingement surface 221 is formed with a bubble liquid flow guide uneven surface.

  The bubble prevention plate 23 is provided behind the collision plate portion 22 and is formed with a large number of small holes 231. The small holes 231 are larger than the size of the bubbles generated by the bubble generation portion 21. The diameter is sufficiently small.

  The shower unit 24 is arranged above the foam prevention plate 23 so as to pour shower water E onto the front surface of the foam prevention plate 23.

  The exhaust mechanism unit 3 includes an exhaust path 32 and an exhaust fan 33 for exhausting the gas in the space 31 behind the foam prevention plate 23 to the outside air. The exhaust fan 33 is used when the dust collector is used in a paint booth. The suction discharge flow (0.4 to 0.6 m / s) F, which is a parallel dust collection flow suitable for capturing the paint mist, is operated at an output.

  Thus, the dust collecting device is used in a painting booth. The device generates a bubble (foam liquid D) having a predetermined fluidity at the bubble generating unit 21, and the collision plate unit 22. It is supplied to the front collision surface 221 and slowly flows down, shower water E is poured from the shower portion 24 toward the bubble prevention plate 23, and the exhaust fan 33 is driven to exert its function.

  By driving the exhaust fan 33, the back space 31 of the mist removing mechanism 2 becomes negative pressure, and the gas in the space is sucked from the front side of the mist removing mechanism 2. That is, when a painting operation is performed on the coating object A with the paint sprayer B, the coating mist drifting in the working space flows to the mist removing mechanism 2 side together with the suction discharge flow F.

  The suction exhaust flow F collides with the collision surface 221 of the collision plate portion 22, changes the direction of the airflow after the collision, passes through the passage 223, and flows behind the collision plate portion 22. When this suction / discharge flow F collides with the collision surface 221, it comes into contact with the foam liquid D that slowly flows down the collision surface 221, and coating mist (fine particles of paint or solvent) adheres to the surface of the foam. Therefore, the coating mist flows down to the lower water tank 1 together with the foam liquid D, and the dust collection water C containing the coating mist is appropriately processed.

  Further, since the foam liquid D has appropriate fluidity, it slowly flows down along the collision surface 221. Naturally, in order to increase the adhesion efficiency of the coating mist, the amount of foam is naturally increased as much as possible. The bubble D1 which detaches and floats is also generated. The paint mist also adheres to the suspended bubble D1 and rides on the suction discharge flow F and flows into the back of the collision plate portion 22 through the passage 223.

  The suction / discharge flow F that has flowed into the collision plate portion 22 passes through the small hole 231 and enters the back space 31 and is discharged from the exhaust passage 32 to the outside air by the exhaust fan 33. The bubbles D1 to which the coating mist that has flown behind the mist adheres are prevented from flowing into the back space 31 by the small holes 231 and close the small holes 231 or adhere to the bubble prevention plate 23. Since the shower water E is showered there, the foam D1 is ruptured, and the coating mist adhering to the foam D1 flows into the lower water tank 1 together with the shower water E.

  Therefore, the paint mist contacts and adheres to the foam (flowing foam and floating foam) and flows into the lower water tank 1 together with the foam liquid D and the shower water E to remove the paint mist from the suction discharge flow F. In particular, according to the present invention, the flow path of the slow suction discharge flow is not blocked by the foam, and the suction discharge flow including the paint mist and the foam are reliably in contact with each other. In addition to adopting fluid foam liquid, it also reliably captures floating mist adhering bubbles, and captures paint mist (fine particles of various solvents including paints and volatile organic solvents) by foam. Removal is realized.

  In addition, this invention is applicable also as another dust collector other than employ | adopting as a painting booth.

DESCRIPTION OF SYMBOLS 1 Lower water tank 2 Mist removal mechanism part 21 Foam generation part 211 Release cylinder 22 Collision board part 221 Collision surface 222 Bending edge 223 Passage path 23 Foam prevention board 231 Small hole 24 Shower part 3 Exhaust mechanism part 31 Back space 32 Exhaust path 33 Exhaust fan A Paint target B Paint sprayer C Dust collection water D Foam liquid E Shower water F Suction discharge flow

Japanese Patent Laid-Open No. 2008-188532, FIG. JP-A-7-68117. Utility model registration No. 3158129.

The dust collector according to the present invention (Claim 1) includes a lower water tank for receiving a foam liquid (meaning a foam having a high content of non-foamed moisture in addition to foam and having fluidity), and a suction containing mist. A dust collector comprising a mist removal mechanism that removes mist by bringing the exhaust flow into contact with bubbles, and an exhaust mechanism that discharges mist removal gas from the back space of the mist removal mechanism to create a suction discharge flow. The mist removing mechanism part generates and supplies a foam liquid having fluidity, and the flat flat U-shaped plate body is arranged so that the front and back are alternately meshed with each other at appropriate intervals. A collision surface on which the discharge flow collides , and a ventilation path that passes from the meshing location to the back after the collision are provided, and a large number of collision plate portions on which the foam liquid supplied from the bubble generation portion flows down are provided on the back surface of the collision plate portion. Foam prevention plate with a small hole and the surface of the foam prevention plate It is to characterized in that it comprises a shower unit hurl shower water.

Thus, when the exhaust mechanism is operated, the back space of the mist removing mechanism becomes negative pressure, and the processing target gas (mist-containing gas) is sucked from a wide range on the front side of the mist removing mechanism. At this time, when foam liquid is generated in the foam generating part and supplied to the collision plate part, the foam liquid slowly flows down the surface of the collision plate part (as a guideline, 10 cm / second), and the gas to be processed becomes a slow suction discharge flow. The processing airflow collides with the front plate and the rear plate of the collision plate portion and crossflows, passes between the edge plates of the front and rear plates, and flows behind the collision plate portion. Therefore, the suction discharge flow is surely brought into contact with the falling foam liquid, and mist adheres to the foam surface, and the mist flows down to the lower water tank together with the foam liquid.

Claims (3)

  The lower water tank that receives the foam liquid, the mist removal mechanism that removes the mist by bringing the mist-containing suction / discharge flow into contact with the foam, and the air after mist removal is discharged from the back space of the mist removal mechanism and the suction / discharge flow A dust collecting device comprising an exhaust mechanism that produces a foam generating unit that generates and supplies a foam liquid having fluidity, a collision surface on which a suction discharge flow collides, and a rear side after the collision A collision plate portion that is provided with a passage that allows passage, the bubble liquid supplied from the bubble generation portion flows down, a bubble prevention plate in which a large number of small holes are formed on the back surface of the collision plate portion, and a foam prevention plate A dust collector characterized by comprising a shower section for showering water on the surface.   The dust collector according to claim 1, wherein a bubble liquid flow guide uneven surface is formed on a collision surface of the collision plate portion.   The dust collector according to claim 1, wherein the collision plate portion is formed by arranging flat flat U-shaped plate bodies alternately meshing with each other at appropriate intervals, and the meshing portion serves as a passage.

Images