JP6167326B2 - Paint mist processing equipment - Google Patents

Description

  The present invention relates to a paint mist processing apparatus that collects paint mist generated in a paint booth and cleans the air.

  As a conventional apparatus for purifying the air of a paint booth and exhausting it outside, a wet processing apparatus is known which sprays water droplets as shown in FIG. 10 to take in paint mist and separates the water droplets from the air with a partition plate. Yes.

  Hereinafter, the wet processing apparatus will be described with reference to FIG.

  As shown in FIG. 10, in the painting booth 101, for example, a paint using an organic solvent as a solvent is sprayed from the painting robot 102, so that the painting mist 103 containing the organic solvent is filled. The air containing the coating mist 103 is discharged outside by the exhaust fan 105 in order to ensure the coating quality on the object 104 to be coated. However, if the air is discharged as it is, the outside environment will be greatly contaminated by the coating mist 103. A wet processing apparatus 106 is installed between the booth 101 and the exhaust fan 105.

  The wet processing apparatus 106 sprays water droplets 108 into the contact chamber 109 by the water droplet sprayer 107 to take the coating mist 103 into the water droplets 108, and separates the water droplets 108 from the air by the partition plate 110 provided leeward of the contact chamber 109. The paint mist 103 in the air is collected based on such a principle. The water droplets 108 including the collected paint mist 103 are dropped from the partition plate 110 and collected in the water receiving tank 111. Mud sludge 112 accumulates in the water receiving tank 111. This is because the semi-liquid coating mist 103 containing an organic solvent adheres in water. The sludge 112 is dewatered and the remaining sludge mass is incinerated.

  In such a conventional wet processing apparatus, the humidity of the processing air is increased by the water used for collecting the coating mist. Since the coating quality greatly affects the humidity, all the processed air must be exhausted to the outside, and the air conditioning cost of the coating booth is greatly increased.

  In order to solve this problem, there is a method of using a dry mist processing apparatus that does not spray water droplets 108 as shown in FIG. 11 (this is an oil mist processing apparatus instead of a paint mist, but see, for example, Patent Document 1). .

  Hereinafter, the oil mist processing apparatus will be described. The oil mist treatment apparatus shown in FIG. 11 has a configuration in which a first perforated screen 113 and a second perforated screen 114 are arranged so as to be inverted by 180 degrees and a filter filter 115 is provided on the downstream side thereof. . As a result, the opening A117 of the first perforated screen 113 opens obliquely with an angle α with respect to the flow direction 116 of the oil mist-containing gas, and the opening B118 of the second perforated screen 114 opens obliquely with −α. ing. The oil mist-containing gas first becomes a downward flow 119 in the first perforated screen 113 along the flow direction 116, and then reverses into the upward flow 120 in the second perforated screen 114. Oil components such as oil mist and oil vapor contained in the oil mist-containing gas are removed by inertia in the reversal of the oil-containing gas and collision of the oil-containing gas with the perforated screen wall surface. Further, fine particles that are not removed by the perforated screens 113 and 114 are removed by the filtration filter 115.

JP-A-8-117537 (5th page, FIG. 2)

  In the conventional wet processing apparatus, since the processing air is humidified, it is not possible to return to the painting booth to reduce the air conditioning cost. Moreover, in the oil mist processing apparatus by patent document 1, the oil mist which was not removed with the perforated screen clogged the filtration filter, and there existed a subject that processing air stopped flowing and oil mist could not be collected.

  SUMMARY OF THE INVENTION The present invention solves the above-described conventional problems, and an object of the present invention is to provide a paint mist processing apparatus that continues to collect paint mist with high collection efficiency without humidification and clogging.

In order to solve the above problems, paint mist processing apparatus of the present invention is a paint mist processing unit that will be installed in the process the air containing the discharged paint mist from paint booth ventilation path back to the painting booth The porous filter A and the porous filter B, both of which are made of porous plate-like metal or ceramics through which air can pass and have slits at different positions when viewed from the ventilation direction, are provided with a certain interval in the ventilation direction. The initial object is achieved by providing the current plates that are alternately stacked and protrude from the upstream side toward the downstream side in the ventilation direction on the wall of the slit .

In the coating mist processing apparatus of the present invention, the processing air passes not only in the zigzag ventilation path created by the porous filter A and the porous filter B but also in the porous filter A and the porous filter B. Two actions of the inertia action obtained when passing through the ventilation path and the filtration action of the porous filter A and the porous filter B act on the coating mist, and a high collection efficiency is obtained. Moreover, the pressure loss which generate | occur | produces when letting process air pass can be reduced compared with the case where only the board which process air cannot pass through is laminated | stacked. Further, even if the porous filter A and the porous filter B are clogged by the coating mist, a zigzag ventilation path for allowing the processing air to pass therethrough is secured, and the clogging does not stop the processing air from flowing. Paint mist can be collected.
In particular, by providing a baffle plate that protrudes from the upstream side to the downstream side in the ventilation direction on the wall of the slit, it is possible to prevent an increase in pressure loss and to obtain a collision effect due to the inertial action of the paint mist. Efficiency is obtained.

The block diagram which shows the upper surface of the coating mist processing apparatus of embodiment of this invention Photomicrograph of a porous filter viewed from the same ventilation direction The block diagram which shows the upper surface of the paint mist processing equipment which made the slit into the flange structure A view of the paint mist processing equipment with multiple slits seen from an angle A figure showing the painting booth that introduced the painting mist processing equipment The same porous filter is pulled out from the downstream side in order and regenerated. The same porous filter is pulled out from the downstream side in order and regenerated The block diagram which shows the comparison unit of Example 1 of this invention Graph of paint mist collection efficiency and pressure loss of the same unit and comparison unit Configuration diagram showing conventional wet processing equipment The block diagram which shows the oil mist processing apparatus of patent document 1

  Hereinafter, the present embodiment will be described with reference to the drawings.

(Embodiment)
FIG. 1 is a configuration diagram showing the upper surface of the coating mist processing apparatus, FIG. 2 is a micrograph of the porous filter viewed from the ventilation direction, and FIG. 3 is a configuration diagram showing the upper surface of the coating mist processing apparatus having a slit flange structure. Fig. 4 is a perspective view of a coating mist processing apparatus provided with a plurality of slits, Fig. 5 is a diagram showing a coating booth in which the coating mist processing apparatus is introduced, and the porous filter is in front of the downstream side. FIG. 6 shows a drawing that is pulled out and regenerated, and FIG. 7 shows a drawing that the porous filter is drawn and regenerated in order from the downstream side.

  As shown in FIG. 1, the coating mist processing apparatus 9 of the present invention comprises a porous filter Aa1, Ab3, Ac5, Ad7 having a slit 10 at the center and porous filters Ba2, Bb4, Bc6, Bd8 having slits 10 at both ends. It has a structure in which porous filters Aa1, Ba2, Ab3, Bb4, Ac5, Bc6, Ad7, and Bd8 are stacked in this order from the upstream side while providing a constant interval.

  Each porous filter has a large number of holes 27 as shown in FIG. 2. For example, the porous filters Aa1 and Ba2 have a thickness of 5 to 15 mm, the pore diameters 3 to 4 mm, and the porous filters Ab3 and Bb4 have a thickness. 5 to 15 mm, pore diameters 2 to 3 mm, porous filters Ac5 and Bc6 are 5 to 15 mm thick, pore diameters 1 to 2 mm, porous filters Ad7 and Bd8 are 5 to 15 mm thick, and pore diameters 0.5 to 1 mm In addition, the pore diameter of the porous filter becomes smaller toward the downstream side.

  In addition, these porous filters are made of metal or ceramics and do not remain bent even when the processing air is passed through, so that a ventilation path for the processing air can always be secured. Moreover, since it does not bend, the coating mist can be easily peeled off by applying high-pressure washing water, and since it does not self-combust, it can be heated to about 600 ° C. to burn off the coating mist.

  The processing air is introduced from the upstream side along the ventilation direction 11 and discharged from the downstream side. At that time, as indicated by the air flow 12 indicated by the arrow, the air passes through the zigzag ventilation path formed by each porous filter and simultaneously passes through each porous filter. When the processing air passes through the steep corners of the zigzag ventilation path, an inertial action that tries to go straight without being bent acts on the coating mist contained in the processing air. By this inertial action, the coating mist adheres to the walls of the ventilation path and the surface of the porous filter and is removed from the processing air.

  Further, as shown in FIG. 2, the porous filter is porous, and a part of the processing air passes through the porous filter without passing through the zigzag ventilation path. At that time, the coating mist in the processing air is collected by the filtering action of the porous filter.

  This filtering action continues to work until the porous filter is clogged, and during that time, the inertia action when passing through the zigzag ventilation path and the filtering action when passing through the porous filter act on the paint mist. High collection efficiency can be obtained.

  Further, a low pressure loss can be obtained until the porous filter is clogged. Even after clogged and the processing air does not pass through the porous filter, the zigzag ventilation path is secured, so that the processing air continues to flow through the coating mist processing device 9 and has a high collection efficiency above a certain level. Can be obtained.

  After clogging, the porous filter can be regenerated by applying high pressure washing water to the porous filter or removing the paint mist by heating the porous filter and burning the paint mist. High collection efficiency and low pressure loss can be obtained again.

  A paint mist having a larger particle diameter has a greater inertial action and filtering action and is more easily removed. Therefore, the coating mist having a large particle diameter is removed on the upstream side of the coating mist processing apparatus 9, and the coating mist having a small particle diameter is not removed and remains in the processing air toward the downstream side. Therefore, high collection efficiency and lower pressure loss can be obtained by increasing the pore diameter of the upstream porous filter as in the coating mist processing apparatus 9 of the present invention and decreasing the pore diameter toward the downstream side.

  In order to obtain a lower pressure loss, it is effective to provide a rectifying plate 13 in the slit 10 as shown in FIG. By providing the rectifying plate 13, the processing air passing through the slit can easily flow downstream, and as a result, pressure loss can be reduced. At that time, the inertial action works without lowering, so that the collection efficiency of the paint mist does not fall.

  By arranging the coating mist processing devices 9 of the present invention in parallel, the amount of processing air can be increased. Specifically, as shown in FIG. 4, by providing a plurality of slits in each porous filter, it is possible to easily obtain the same structure as arranging the small coating mist processing devices 9 in parallel. At that time, in order to obtain a zigzag ventilation path, the slit position must be different between the front and rear.

  An overall view of the painting booth in which the painting mist processing device 9 is introduced is shown in FIG. 5 and will be described below. In the painting booth 14, the paint is sprayed from the painting robot 15 and the painting object 16 is painted. At that time, the painting mist 17 that has not been applied to the painting object 16 rises in the painting booth 14. In this state, since the coating on the next object to be coated is affected, air including the coating mist 17 in the painting booth 14 is quickly sucked under the floor 19 by the circulation fan 18.

  The processing air discharged from the coating booth 14 is introduced into the coating mist processing apparatus 9 of the present invention, and the coating mist 17 in the processing air is removed. The treated air from which the coating mist 17 has been removed is partially exchanged with the outside air by the ventilator 21 having the heat exchange air unit 20 so as to be below the explosion limit of the organic solvent contained in the paint, and then passes through the air conditioner 22. The temperature and humidity are returned to the painting booth 14 with the temperature and humidity adjusted to, for example, 25 ° C. and 60% RH or less.

  In addition, the process air after passing through the air conditioner 22 is added with air ions by the ion generating means 28 before being returned to the coating booth 14. As shown in FIG. 5, the ion generating means is composed of a discharge electrode 29 having a sharp tip and a plate-like counter electrode 30, and a high voltage is applied to the discharge electrode 29 by a high voltage power supply 31 and 0 V is applied to the counter electrode 30. To cause discharge, and generate air ions from the tip of the discharge electrode 29.

  The coating mist charged with air ions attached thereto is easily collected and collected by each porous filter due to the action of an electric field. Further, in order to release the electric charge accumulated by the charged coating mist 17 adhering, each porous filter is connected to the ground and becomes 0V.

  Next, the operation | movement which removes the collected coating mist from a porous filter and reproduces | regenerates an apparatus is demonstrated below using FIG. 6 and FIG.

  The width W1 in the longitudinal direction of each porous filter is made to be twice the width W2 of the duct 23 so that the porous filter can be present in the duct 23 constituting the ventilation path even if the porous filter is pulled out horizontally. After the clogging, as shown in FIG. 6, the porous filter is sequentially drawn from the downstream side by a half length (= W2) of the width W1 in the longitudinal direction of each porous filter, and is emitted from the high-pressure washing water nozzle 24. The coating mist 17 collected by applying the high-pressure washing water is washed away.

  The washing water remaining in the porous filter is blown off and removed by applying high-pressure air generated from the high-pressure air nozzle 25. The washing water falls and is stored in the washing water receiving tank 26 by gravity.

  As shown in FIG. 7, each porous filter clogged by collecting the paint mist is pulled out from the downstream side to the back side in this order, and the collected paint mist 17 is collected by the high-pressure washing water. Wash water removed from the filter and remaining in the porous filter is blown away by high-pressure air.

  As described above, since the water does not directly contact the processing air, it is possible to remove the coating mist 17 from the processing air without humidification. Accordingly, the processing air from which the coating mist 17 has been removed can be returned to the coating booth 14 after a part of the processing air is exchanged with the outside air.

  In the conventional wet processing apparatus, since the processing air after removing the coating mist 17 is humidified, it is necessary to discharge the entire amount to the outside of the room, and thus the air conditioning cost of the coating booth 14 is large. Since the coating mist 17 can be removed without being humidified in the coating mist processing apparatus 9 of the present invention, the processing air can be returned into the coating booth, and the air conditioning cost of the coating booth 14 can be reduced.

(Example)
The collection efficiency and pressure loss of the coating mist processing apparatus according to the embodiment provided with the current plate 13 described in FIG. 3 were measured. Hereinafter, this apparatus is referred to as an implementation unit. The opening size of the implementation unit was 104 mm □. Further, the thickness A of each porous filter having the dimensions shown in FIG. 3 was set to 10 mm. Similarly, the protruding dimension B of the rectifying plate 13 was 5 mm, and the distance C between the porous filters was 25 mm.

  The dimension D of the slit 10 located at the center was 30 mm, and the dimension E per slit 10 located at both ends was 15 mm, which is half of that. The diameter of the holes 27 of the porous filters Aa and Ba is 3 mm, the diameter of the holes 27 of the porous filters Ab and Bb is 2 mm, the diameter of the holes 27 of the porous filters Ac and Bc is 1.3 mm, and the porous filters Ad and Bd The diameter of the hole 27 was 0.9 mm.

  Here, a rough rectifying effect can be obtained without unnecessarily enlarging the apparatus by setting the guideline of the protruding dimension B of the rectifying plate 13 to about 0.5 to 1 times the thickness A of each porous filter. The distance C between the porous filters is a value obtained by adding 0.5 to 1.5 times the dimension E of the slit 10 located at the center and the protruding dimension of the rectifying plate 13, thereby preventing an increase in pressure loss and painting. A collision effect due to the inertial action of the mist can also be obtained.

  Further, as shown in FIG. 8, a coating mist processing apparatus using a wall plate 33 in which air cannot pass through instead of the porous filter as shown in FIG. 8 was created, and the collection efficiency and pressure loss were measured in the same manner. This device is referred to as a comparison unit 32. The wall thickness A is 10 mm as in the porous filter of the implementation unit, and the other dimensions are the same as those of the implementation unit.

  FIG. 9 shows the results of the collection efficiency and pressure loss of each unit when the air containing the paint mist was sucked from the suction port under the condition of the wind speed of 2.9 m / s. As shown in FIG. 9, even if the collection efficiency of the comparison unit is high, the implementation unit obtains a collection efficiency of 90% with respect to 65%.

  In addition, the pressure loss of the comparison unit is around 1700 Pa, whereas the pressure loss of the implementation unit is 340 Pa at the beginning and 800 Pa when the coating mist spray amount reaches 50 g, which is always much lower than the comparison unit. became. As shown by the measurement results, it was found that the coating mist processing apparatus of the present invention can obtain higher collection efficiency and lower pressure loss than the conventional apparatus.

  The coating mist processing apparatus according to the present invention can achieve high coating mist collection efficiency and low pressure loss without humidification or clogging, so that the air conditioning in the coating booth used in the coating process of automobiles and home appliances, etc. It is useful as a paint quality maintenance device that can reduce costs.

1 Porous filter Aa
2 Porous filter Ba
3 Porous filter Ab
4 Porous filter Bb
5 Porous filter Ac
6 Porous filter Bc
7 Porous filter Ad
8 Porous filter Bd
DESCRIPTION OF SYMBOLS 9 Coating mist processing apparatus 10 Slit 11 Ventilation direction 12 Air flow 13 Rectifying plate 14 Coating booth 15 Coating robot 16 Coating object 17 Coating mist 18 Circulating fan 19 Floor 20 Heat exchange air unit 21 Ventilator 22 Air conditioner 23 Duct 24 High pressure Washing water nozzle 25 High pressure air nozzle 26 Washing water receiving tank 27 Hole 28 Ion generating means 29 Discharge electrode 30 Counter electrode 31 High voltage power supply 32 Comparison unit 33 Wall plate

Claims (4)

A paint mist processing unit that will be installed in the process the air containing the discharged paint mist from paint booth ventilation path back to the painting booth, from both a porous plate-shaped metal or ceramic which air can pass The porous filter A and the porous filter B having slits at different positions when viewed from the ventilation direction are alternately stacked while providing a certain interval in the ventilation direction, and the slit wall is upstream of the ventilation direction from the downstream side. Paint mist processing equipment with a rectifying plate that protrudes toward the surface . The protruding dimension of the rectifying plate is 0.5 to 1 times the thickness of the porous filter, and the distance between each porous filter is 0.5 to 1.5 times the dimension of the slit located at the center. The coating mist processing apparatus according to claim 1, which is a numerical value obtained by adding The coating mist processing apparatus according to claim 1, wherein a dimension of the slit is larger than a hole diameter of the porous filter . The coating mist processing apparatus according to any one of claims 1 to 3, wherein air at a wind speed of 2.9 m / s is sucked to collect the coating mist.

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