JP7144172B2 - Electric field purification device and workpiece drying system - Google Patents

Description

The present invention relates to an electric field purification device for collecting tar components from tar component-containing air, and a work drying system having the electric field purification device.

Conventionally, as this type of electric field purification device, there is known one in which an electrode hangs down from the center of a vertically extending duct, and the tar component is collected on the inner surface of the duct while the tar component-containing air passes through the duct ( For example, see Patent Document 1).

JP 2017-217625 A (Fig. 3)

The above-described conventional electric field purifying device is intended to facilitate cleaning work compared to the conventional filter type air purifying device, but there is a demand for further simplification of cleaning work.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an electric field purifier and a work drying system that can perform cleaning work more easily than before.

In order to achieve the above object, the invention of claim 1, which is made to achieve the above object, generates an electric field between a duct having a substantially circular cross section through which tar component-containing air passes, and a center electrode extending along the center of the duct, thereby removing the tar component. is collected on the inner surface of the duct, wherein the duct extends in a direction parallel to or inclined with respect to the horizontal direction, extends in the axial direction of the duct, or is provided side by side, and the lower part of the duct A tar discharge hole penetrating inside and outside to discharge the tar formed by agglomeration of the tar components, and a tar recovery chamber extending in the axial direction of the duct and facing the tar discharge hole from below. and a tar collection housing that has an opening that is opened and closed by the duct, or that is detachably attached to the duct.

According to the second aspect of the invention, an electric field is generated between a duct having a substantially circular cross section through which the tar component-containing air passes and a center electrode extending along the center of the duct to collect the tar component on the inner surface of the duct. In the device, the duct extends in a direction parallel or inclined to the horizontal direction, is splittable into upper and lower parts by a split plane including the central axis, penetrates the lower part of the duct inside and outside, and and a tar collecting housing facing the tar discharging hole from below and collecting the tar .
In the third aspect of the invention, an electric field is generated between a duct having a substantially circular cross section extending horizontally and through which the tar component-containing air passes, and a center electrode extending along the center of the duct, and the tar component is removed from the inner surface of the duct. a tar discharge hole penetrating inside and outside the lower part of the duct to discharge the tar formed by agglomeration of the tar component; a scum collecting housing having a scum collecting chamber facing from inside; an elongated tray accommodated in the scum collecting chamber; and the oblong cover that closes the opening.

The invention of claim 4 is the electric field purification device according to claim 1 or 2 , wherein the duct can be divided into upper and lower parts on a dividing plane including the central axis thereof.

The invention of claim 5 is the electric field purification device according to claim 3 or 4 , wherein a plurality of discs protrude inward from the duct.

The invention of claim 6 is the electric field purifier according to claim 5, wherein the plurality of discs form a ring assembly that is separate from the duct and connected by a connecting member.

The invention according to claim 7 is the electric field purification device according to claim 6, wherein the ring aggregate can be divided on a dividing plane including the central axis thereof.

The invention of claim 8 is the electric field purifier according to any one of claims 1 to 7, further comprising a pair of electrode support parts disposed at both ends of the duct and supporting the center electrode. .

A ninth aspect of the invention comprises a booth for drying a coated work, a heating circuit that draws air containing tar components in the booth, heats it, and returns it to the booth, and a heating circuit that is connected in the middle of the heating circuit. A work drying system comprising the electric field purification device according to any one of claims 1 to 8.

According to the invention of claim 10, the booth for drying the painted work is connected in the middle of an exhaust path for discharging the air in the booth to the atmosphere. and an electric field purification device.

In the electric field purification device of claims 1 to 3 , since the duct extends in the horizontal direction or in the oblique horizontal direction, compared with the conventional one in which the duct extends in the vertical direction, the movement in the vertical direction during cleaning is less. and cleaning work becomes easier. In addition, since the tar formed by agglomerating tar components moves in the circumferential direction or oblique circumferential direction of the duct and gathers at the lower end of the duct, the tar moves in the axial direction of the duct and is collected as in the conventional case. The moving distance of the tar is shorter than that of the tar, making it easier to collect the tar. Then, the tar is discharged from the tar discharge hole at the lower end of the duct to the tar recovery housing outside the duct. Therefore, the tar can be collected from the tar collection housing and the tar cleaning work can be performed, so that the cleaning work can be easily performed without disassembling the entire electric field cleaning device.

Further , as in claim 1, the tar discharge hole may extend in the axial direction of the duct, or may be formed in a plurality. If the tar discharge slit has a slit structure, the tar can be efficiently discharged out of the duct.

According to the structure of claim 3, since the resin is stored in the tray in the resin collection housing, the tray can be taken out and cleaned easily.

In the constructions of claims 2 and 4, since the duct can be divided into upper and lower parts, the inside of the duct can be easily cleaned.

In the electric field purifier of claim 5, since a plurality of discs protrude inside the duct, the recovery efficiency of the tar component is improved. In addition, in the electric field purification device of claim 6, since the plurality of discs are separate from the duct and are a ring assembly connected by a connecting member, both cleaning and disassembly work are easy. can be done. Furthermore, if the ring aggregate is also divided like the structure of claim 7, the disassembly and assembly operations are further facilitated.

The center electrode may have a cantilever structure. Also the center electrode stabilizes at the center of the duct. As a result, the electric field is stabilized, and the tar component recovery efficiency is stabilized.

Since the work drying system of claims 9 and 10 is provided with the electric field purification device according to the present invention, the cleaning work is facilitated, thereby shortening the cleaning time and increasing the operating rate. In addition, since the duct of the electric field purification device extends horizontally or obliquely horizontally, it can be installed indoors where the ceiling is not high.

1 is a conceptual diagram of a work drying system according to one embodiment of the present invention; Front sectional view of electric field purification device Planar sectional view of electric field purification device Disassembled perspective view of electric field purification device Side view of support box Exploded perspective view of duct Perspective view of ring assembly Perspective view of a semicircle Perspective view of lower groove body and divided body

An embodiment of the present invention will be described below with reference to FIGS. 1 to 9. FIG. The work drying system 10 shown in FIG. 1 has a booth 90 extending from a painting booth (not shown), and in the booth, a temperature raising zone 11 and a holding zone 12 are provided in series. Then, the coated work W is heated to a predetermined temperature in the temperature raising zone 11 and then further heated in the holding zone 12 to fix the paint to the work W.

The workpiece drying system 10 is provided with separate heating circulation paths 11A and 12A in the temperature raising zone 11 and the holding zone 12, respectively. The heating circulation paths 11A and 12A both have heaters 11C and 12C and fans 11B and 12B. Or return to holding zone 12 . An electric field purification device 20 is provided upstream of the heater 12C and the fan 12B in the heating circulation path 12A of the holding zone 12 to remove tar components such as VOCs (volatile organic compounds) generated in the holding zone 12. be done.

In the temperature raising zone 11, less tar component is generated than in the holding zone 12, so the heating circuit 11A of the temperature raising zone 11 is provided with the conventional filter 11F instead of the electric field purification device 20. are provided. Also, part of the air in the booth 90 having the heating zone 11 and the holding zone 12 passes through a known air purifier 13 and is released to the atmosphere.

As shown in FIG. 2, the electric field purifying device 20 includes a pair of ducts 30, 30 between a pair of support boxes 21, 21 arranged symmetrically. As shown in FIG. 4, the support box 21 has a shape in which both front and rear corners of a rectangular parallelepiped box are chamfered. The inclined portions 21S, 21S are inclined so as to approach each other. A rectangular tube-shaped duct connection portion 22 protrudes from the upper surface of each support box 21 . The duct connection portion 22 of one support box 21 is connected to the exhaust port of the holding zone 12, and the duct connection portion 22 of the other support box 21 is connected to the heater 12C.

One side wall 21A (hereinafter referred to as "first side wall 21A") of each support box 21 is formed with a circular side opening 21C. A rectangular front opening 21E is formed in each front wall 21F above each inclined portion 21S. Further, as shown in FIG. A rectangular side opening 21D is also formed in the second side wall 21B''). In addition, a plurality of through holes 21K are formed at the opening edges of the side openings 21C, 21D and the front opening 21E (partially not shown), and nuts are attached to the inner surfaces of the support boxes 21 overlapping the through holes 21K. are welded to each other.

As shown in FIG. 5, a plate-like lid 28 is superimposed on the second side wall 21B so as to close the side opening 21D and is fixed with bolts. Similarly, as shown in FIG. 4, a plate-like cover 29 is superimposed on each front wall 21F so as to close the front opening 21E and is fixed with bolts.

As shown in FIG. 2, a connecting duct 23 is attached to the opening edge of the side opening 21C of the first side wall 21A. As shown in FIG. 4, the connecting duct 23 has a structure in which a pair of flanges 23F, 23F protrude laterally from both ends of a flat cylindrical wall 23H. A plurality of through holes 23K are formed in each flange 23F to match the through holes 21K around the side opening 21C. One flange 23F is fixed by bolts to the edge of the side opening 21C.

The connection duct 23 is provided with a housing portion 24 projecting upward from the cylindrical wall 23H. The upper end of the housing part 24 is closed, and the lower end communicates with the inside of the cylindrical wall 23H. The upper end of the vertically extending electrode support bar 25 is fixed inside the housing 24 , and the lower end of the electrode support bar 25 is arranged at the center of the cylindrical portion of the connecting duct 23 .

A through hole 26 is formed in the lower end of the electrode support bar 25 coaxially with the central axis of the cylindrical wall 23H. Further, as shown in FIG. 5, the cover 28 of the second side wall 21B of the support box 21 is also formed with a through hole 26 on the central axis of the cylindrical wall 23H. An insulating pipe 27 made of ceramics, for example, passes through the through-holes 26, 26, and as shown in FIG. there is A pipe holder 28H that holds the insulating pipe 27 is fixed to the lid 28, and the axial movement of the insulating pipe 27 is restricted by the pipe holder 28H. The insulating pipe 27 constitutes an electrode support portion 27K that supports a center electrode 63, which will be described later.

As shown in FIG. 4 , the duct 30 has a horizontally extending cylindrical wall 31 and a tar collection housing 36 fixed to the lower outer surface of the cylindrical wall 31 . The cylindrical wall 31 is divided into an upper groove body 32 and a lower groove body 33 in a horizontal section including its central axis.

Of the upper groove 32 and the lower groove 33 (hereinafter collectively referred to as "upper and lower grooves 32 and 33"), from the joint corresponding to the horizontal cut portion of the cylindrical wall 31, one joint each The projecting pieces 34, 34 protrude to both sides. A plurality of through holes (not shown) are formed in the joining protruding piece 34 . A nut is welded to the lower surface of the joint projecting piece 34 of the lower groove body 33 so as to overlap the through hole.

Both ends of the cylindrical wall 31 are provided with annular inward flanges 35 projecting inward. The inward flanges 35 are vertically divided into semicircular arc flanges 35A, 35A and welded to both ends of the upper and lower groove bodies 32, 33. As shown in FIG. Further, the inward flange 35 is formed with a plurality of through holes 35K corresponding to the plurality of through holes 23K of the flange 23F of the connecting duct 23. As shown in FIG. Furthermore, a nut is welded to the inner surface of only the inward flange 35 at one end of the cylindrical wall 31 so as to overlap the through hole 35K. Then, the upper grooves 32, 32 and the lower grooves 33, 33 are overlapped with the circular arc flanges 35A, 35A on the side without nuts, and fixed with bolts and nuts. 32 and the joint projections 34 of the lower grooves 33, 33 are vertically stacked and fixed with bolts, and the ducts 30, 30 are connected in series. In this state, the flanges 23F of the connecting duct 23 are superimposed on the circular arc flanges 35A, 35A of the ducts 30, 30 on the sides having the nuts, and are fixed with bolts.

As shown in FIG. 6, the tar recovery housing 36 extends in the longitudinal direction of the cylindrical wall 31 and has a rectangular groove shape with both ends closed, and the top opening is closed by the cylindrical wall 31 and welded. there is Further, as shown in FIG. 3 , the tar collecting housing 36 is slightly shorter than the cylindrical wall 31 , and both end portions of the tar collecting housing 36 are arranged near both ends of the cylindrical wall 31 . Furthermore, a slit-shaped tar discharge hole 31S is formed in the lowermost end of the cylindrical wall 31 from a position near one end to a position near the other end, and the inside of the cylindrical wall 31 and the tar collecting housing are formed through the tar discharge hole 31S. 36 are in communication with each other.

Further, as shown in FIG. 3, the distance from the lower surface of the tar collection housing 36 to the center of the cylindrical wall 31 is the same as the distance from the lower surface of each support box 21 to the center of the side opening 21C. As shown in FIG. 2, each support box 21 and ducts 30, 30 are placed on the same floor surface. In addition, as shown in FIG. 6, an opening 37 is formed over the entire lengthwise side surface of the tar collection housing 36 except for the outer edge. Furthermore, a plurality of screw holes 36N are formed in the opening edge of the opening 37. As shown in FIG. A groove-shaped tray 60 having substantially the same length as the resin discharge hole 31S is accommodated in the resin collection chamber 36S in the resin collection housing 36, and the strip plate-like cover 39 is attached to the bolt in a state in which the opening 37 is closed. is fixed.

Each duct 30 accommodates a ring assembly 40 shown in FIG. The ring assembly 40 as a whole has a cylindrical crosspiece structure that fits just inside the duct 30 . Specifically, the ring assembly 40 includes a plurality of rings 41 arranged at regular intervals in the longitudinal direction and a plurality of connecting rods 44 connecting the rings 41 , 41 . The ring 41 includes a flat cylindrical portion 42 and an annular disc portion 43 projecting sideways from one end of the cylindrical portion 42. The disc portion 43 is formed with a plurality of through holes 43A. . As shown in FIG. 8, the connecting rod 44 has a cylindrical main end portion 44A, and a male thread portion 44B having a smaller outer diameter than the main end portion 44A protrudes from one end surface of the cylindrical main end portion 44A. A female screw hole (not shown) that opens to the other end face is formed in the other end. The connecting rods 44, 44 are screwed together through the through hole 43A of the disk portion 43 of the ring 41, and the opening edge of the through hole 43A is sandwiched between the connecting rods 44, 44. A bolt (not shown) is passed through the through hole 43A of the ring 41 at one end of the ring assembly 40 and screwed into the female threaded hole of the connecting rod 44, while it is screwed into the male threaded portion 44B of the connecting rod 44 at the other end. is screwed with a nut N (see FIG. 7). In this manner, the rings 41 are connected by the connecting rods 44 to form the ring aggregate 40 .

The ring assembly 40 is accommodated in the duct 30 so that the disk portion 43 of each ring 41 is located downstream of the cylindrical portion 42 . Further, as shown in FIG. 4, the ring assembly 40 is positioned in the axial direction of the cylindrical wall 31 by adjoining the inward flanges 35, 35 of the cylindrical wall 31 at both ends thereof.

As shown in FIG. 6, like the cylindrical wall 31 of the duct 30, the ring assembly 40 is divided into a pair of division bodies 45, 45 in a horizontal section including the central axis. That is, the plurality of rings 41 constituting the ring aggregate 40 are divided into a pair of semicircular bodies 50, 50 vertically as shown in FIG. 50 are connected by a connecting rod 44 to form split bodies 45 , 45 . As shown in FIG. 8 , end plates 46 are welded to both ends of each semicircular body 50 so as to straddle the cylindrical portion 42 and the disk portion 43 . The end plate 46 has a square plate shape, one of two adjacent sides of which is welded to the tip edge of the cylindrical portion 42 and the other of which is welded to the tip edge of the disk portion 43 . A tip end face of each semicircular body 50 is formed by a pair of end plates 46, 46, and as shown in FIG. end plates 46 are in a superimposed state. Also, each divided body 45 is just fitted in the upper groove 32 and the lower groove 33 (see FIG. 9).

As shown in FIG. 2 , a metal wire 62 is inserted through the pair of insulating pipes 27 , 27 and tensioned to form a center electrode 63 extending to the center of the duct 30 . Specifically, while both ends of the metal wire 62 are extended from one insulating pipe 27 and the other insulating pipe 27, a clamp (not shown) for retaining the metal wire 62 is fixed to one end thereof, while the other end is part is pulled by a coil spring or the like. The center electrode 63 (metal wire 62) is insulated from the base or ground supporting the electric field purification device 20, while the duct 30 and the ring assembly 40 are connected to the base or the ground by grounding the center electrode 63 and the ground. A DC voltage is applied between An electric field is thereby generated between the center electrode 63 and the duct 30 .

The configuration of the workpiece drying system 10 and the electric field purification device 20 of the present embodiment has been described above. Next, the effects of the work drying system 10 and the electric field purification device 20 will be described.

During the operation of the work drying system 10 , tar component-containing air is supplied from the holding zone 12 to the electric field purification device 20 . When the tar component-containing air passes through the duct 30 , the tar component particles are attracted toward the inner surface of the duct 30 by the Coulomb force generated by the electric field in the duct 30 and collected in the gaps between the ring aggregates 40 . More specifically, the ring assembly 40 is composed of a plurality of rings 41, and since the disk portions 43 provided in the rings 41 protrude from the inner surface of the duct 30, the tar component drawn to the inner surface side of the duct 30 is Adheres to the disk portion 43 efficiently. Moreover, since the cylindrical portion 42 protrudes upstream from the inner edge portion of the disc portion 43, the tar component that has entered the outer side of the cylindrical portion 42 is less likely to be affected by the wind pressure and is prevented from being blown away. Then, the tar component adhering to the inner surface of the duct 30 and the ring assembly 40 gathers to form tar, which flows down by gravity. At that time, the resin moves in the circumferential direction of the duct 30 and gathers at the lower end of the duct 30, so the moving distance of the resin is shorter than in the conventional case in which the resin moves in the axial direction of the duct and is collected. It becomes easy to collect the tar. Then, the resin collects in the tray 60 in the resin collection housing 36 through the resin discharge hole 31S. Therefore, when a predetermined amount of resin accumulates on the tray 60, the cover 39 is removed from the resin collection housing 36 to open the opening 37 while the work drying system 10 is stopped, and the tray 60 is taken out and replaced with a new tray 60. Replace it. By cleaning only the tray 60, tar can be easily cleaned without disassembling the entire electric field cleaning device 20 and without stopping the work drying system 10 for a long period of time.

Further, when performing maintenance on the entire work drying system 10, the inside of the duct 30 and the ring assembly 40 can be easily cleaned by dividing the duct 30 into the upper groove 32 and the lower groove 33 and further removing the ring assembly 40. can be cleaned to Moreover, since the ring aggregate 40 is divided into the divided bodies 45, 45, it can be easily put in and taken out of the duct 30. As shown in FIG. Furthermore, it is also possible to divide the ring assembly 40 into a plurality of rings 41 for cleaning. In addition, since the duct 30 extends horizontally, compared with the conventional one in which the duct extends in the vertical direction, there is less movement in the vertical direction during cleaning.

As described above, the cleaning work can be easily performed in the electric field purification device 20 of the present embodiment. As a result, the work time for cleaning can be shortened, and the operating rate of the work drying system 10 can be increased. Moreover, since the duct 30 extends horizontally, it can be installed indoors where the ceiling is not high. Furthermore, since the center electrode 63 is supported by the pair of electrode support portions 27K, 27K provided at both ends of the duct 30, the center electrode 63 remains in the center of the duct 30 even if the duct 30 is lengthened. stable at the As a result, the electric field is stabilized, and the tar component recovery efficiency is also stabilized.

[Other embodiments]
In addition to the above-described embodiments, configurations exemplified below are conceivable.

(1) In the electric field purification device 20 of the above embodiment, the duct 30 extends horizontally, but the duct 30 may be inclined at an angle of 45 degrees or less with respect to the horizontal direction.

(2) In the electric field purification device 20 of the above embodiment, the center electrode 63 is supported in a double-supported state, but may be supported in a cantilevered state.

(3) In the electric field purification device 20 of the above-described embodiment, the slit-shaped tar discharge hole 31S extends continuously in the lower part of the duct 30, but it may be divided. Also, the tar discharge holes 31S may be formed in a row at the lower end portion of the duct 30 in a circular hole shape.

(4) The tray 60 was housed in the tar collection housing 36 of the electric field purification device 20 of the above-described embodiment, but the tray 60 was not housed, and the discharge hole formed in the tar collection housing 36 was discharged to the outside. A configuration in which tar is discharged into a prepared container may be employed.

(5) In the work drying system 10 of the above-described embodiment, the electric field purification device 20 is provided only in the middle of the heating circulation path 12A of the holding zone 12. A device 20 may be provided. Also, the electric field purification device 20 may be provided in an exhaust passage for discharging part of the air in the booth 90 to the atmosphere. Specifically, an electric field purification device 20 is provided in front of the above-described known air purification device 13 (see FIG. You may provide the electric field purification apparatus 20 instead of. Further, the electric field purifying device 20 may be provided in an exhaust passage for discharging the air in the cooling zone 91 provided in the post-process of the holding zone 12 to the atmosphere.

REFERENCE SIGNS LIST 10 work drying system 11 temperature raising zone 11A, 12A heating circulation path 12 holding zone 20 electric field purification device 27K electrode supporting portion 30 duct 31S tar discharge hole 36 tar collection housing 37 opening 39 lid 40 ring assembly 41 ring 43 disk portion 60 tray 63 center electrode

Claims (10)

An electric field purification device for generating an electric field between a duct having a substantially circular cross section through which tar component-containing air passes and a center electrode extending along the center of the duct to collect the tar component on the inner surface of the duct,
the duct extends in a direction parallel to or inclined with respect to a horizontal direction;
a tar discharge hole extending in the axial direction of the duct or arranged side by side , penetrating inside and outside the lower part of the duct, and discharging the tar formed by agglomeration of the tar components;
A scum recovery housing that extends in the axial direction of the duct and has a scum recovery chamber that faces the scum discharge hole from below and has an opening that is opened and closed by a lid, or that is detachably attached to the duct. and an electric field purification device. An electric field purification device for generating an electric field between a duct having a substantially circular cross section through which tar component-containing air passes and a center electrode extending along the center of the duct to collect the tar component on the inner surface of the duct,
The duct extends in a direction parallel or inclined with respect to the horizontal direction, and can be divided into upper and lower parts by a dividing plane including its central axis,
a tar discharge hole penetrating inside and outside the lower part of the duct for discharging tar formed by agglomeration of the tar component;
and a tar recovery housing that faces the tar discharge hole from below and recovers the tar. An electric field purifying device for generating an electric field between a horizontally extending duct having a substantially circular cross section through which tar component-containing air passes and a center electrode extending along the center of the duct to collect the tar component on the inner surface of the duct. hand,
a tar discharge hole penetrating inside and outside the lower part of the duct for discharging tar formed by agglomeration of the tar component;
a tar collecting housing having therein a tar collecting chamber extending in the axial direction of the duct and facing the tar discharge hole from below;
an elongated tray contained in the resin collection chamber;
a horizontally long opening formed in one side of the tar collecting housing for inserting and removing the tray;
and the oblong cover that closes the opening. 4. The electric field purifier according to claim 1 , wherein the duct can be vertically divided on a dividing plane including the central axis thereof. 5. The electric field purifier according to claim 3 , wherein a plurality of discs protrude inwardly from said duct. 6. The electric field purification device according to claim 5, wherein said plurality of discs form a ring aggregate which is separate from said duct and connected by a connecting member. 7. The electric field purifier according to claim 6, wherein said ring aggregate can be split along a split plane including its central axis. 8. The electric field purification device according to any one of claims 1 to 7, further comprising a pair of electrode support portions disposed at both ends of said duct and supporting said center electrode. a booth for drying the painted work,
a heating circulation path that sucks the tar component-containing air in the booth, heats it, and returns it to the booth;
and the electric field purification device according to any one of claims 1 to 8, which is connected in the middle of the heating circuit. a booth for drying the painted work,
and an electric field purification device according to any one of claims 1 to 8, which is connected in the middle of an exhaust path for discharging air in the booth to the atmosphere.

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