JP2019111469A - Charging device and electric dust collector - Google Patents

Abstract

To provide a charging device which improves charge efficiency and prevents omission of a wire electrode.SOLUTION: A charging device includes: a discharge 30 for discharge formed by bundling a plurality of fibrous wire electrodes 30A; first sandwiching body 32 and a second sandwiching body 33 which sandwich the electrode 30 for discharge from both sides thereof so that the tip of the electrode for discharge projects; and a first plate-like member 34 and a second plate-like member 35 which further sandwich the first sandwiching body 32 and the second sandwiching body 33 sandwiching the electrode 30 for discharge from both sides thereof. The first sandwiching body 32 and the second sandwiching body 33 are arranged so as to face the first plate-like member 34 and the second plate-like member 35, respectively. The tip of the electrode 30 for discharge projects toward the upstream side and the downstream side in an air flow direction from the first plate-like member 34 and the second plate-like member 35, and a high voltage is applied to the electrode 30 for discharge through one sandwiching body of the first sandwiching body 32 and the second sandwiching body 33 from one plate-like member of the first plate-like member 34 and the second plate-like member 35.SELECTED DRAWING: Figure 7

Description

  The present invention relates to a charging device for charging particles such as dust in dust-containing air and mist in oil smoke by corona discharge generated by application of a high voltage, and an electrostatic precipitator including the charging device.

Devices for charging particles in air by corona discharge are known.
For example, Patent Document 1 discloses an ion generator in which one end of a fiber bundle is filled and supported in a U-shaped concave groove of a metal ring (see Patent Document 1).

JP, 2017-50264, A

  However, in the ion generator described in Patent Document 1, since one end of the fiber bundle is filled and supported in the U-shaped concave groove of the metal ring, only one side of the air flow direction is arranged with the fiber bundle. Can not do it. Moreover, since it is difficult to arrange the fiber bundles in the circumferential direction at intervals, there is a possibility that discharge interference may occur between the fiber bundles. Therefore, there is a problem that the charging efficiency can not be improved.

  Furthermore, due to the structure, there is a problem that it is difficult to prevent all the fiber bundles filled in the recessed groove from falling off over the circumferential direction, and there is also a problem that it is difficult to replace the fiber bundles.

  The present invention has been made to solve the above-mentioned problems, and it is possible to improve the charging efficiency, and to prevent the falling off of the bundled fibrous line electrodes and to easily replace the line electrodes. Charging device and electrostatic precipitator that can be

  In order to achieve the above object, a first charging device of the present invention is a charging device for charging particles in air by corona discharge generated by application of high voltage, and bundles a plurality of fibrous line electrodes. A first electrode and a second holding member sandwiching the discharge electrode from both sides so that the tip of the discharge electrode protrudes, and the first sandwiching the discharge electrode And a first and a second plate-like member sandwiching the second sandwiching body from both sides, the first sandwiching body being disposed to be opposed to the first plate-like member; The sandwiching member is disposed to face the second plate-like member, and the tip of the discharge electrode has the first and second plate-like shapes toward the upstream side and the downstream side of the flow direction of air. At least one of the first plate member and the second plate member. High voltage, characterized in that it is applied displaced or from one of the plate-like member to the discharge electrode through the at least one holding member of the first holding member and second holding member.

  According to a second charging device of the present invention, in the first charging device described above, the first plate member and the second plate member are formed in a ring shape, and the discharge electrode is held. It is preferable that the first and second holding members are fixed to each other by fixing means in a state in which the first and second holding members are further held from both sides.

  According to the first and second charging devices of the present invention, the tip end portion of the discharge electrode is disposed toward the upstream side and the downstream side in the flow direction of air, so that the charging efficiency can be improved. Since the sandwiching body for sandwiching the discharge electrode is sandwiched by the plate-like members, the discharge electrode does not easily come off the sandwiching body. Therefore, a structure for preventing all the discharge electrodes from falling off (falling off) can be realized at relatively low cost. In addition, high voltage can be stably applied to all discharge electrodes by a relatively simple and hard to remove structure.

  According to a third charging device of the present invention, in the first or second charging device described above, at least one of the first holding body to which a high voltage is applied and the second holding body is a holding body It is fixed to at least one plate member of the first plate member and the second plate member to which a high voltage is applied via an adhesive layer, and the adhesive layer has conductivity. Is preferred.

  According to the third charging device of the present invention, a high voltage can be stably applied to the discharge electrode via the plate-like member and the adhesive layer having conductivity.

  According to a fourth charging apparatus of the present invention, in the first or second charging apparatus described above, at least one of the first holding body to which a high voltage is applied and the second holding body is a holding body It is preferable to be made of a conductive material provided with an adhesive layer on both sides.

  According to the fourth charging device of the present invention, the discharge electrode can be supported with a relatively simple configuration, and a high voltage can be applied to the discharge electrode via the sandwiching member.

  A fifth charging apparatus of the present invention is the charging apparatus according to any one of the second to fourth aspects, wherein the first holding body and the second holding body are circumferentially perpendicular to the flow direction of air. It is preferable to divide into a plurality with a gap, and to provide a support insulator and a feeding insulator in the gap.

  According to the fifth charging device of the present invention, the charging device can be supported and fed with a relatively simple configuration.

  The sixth charging device of the present invention is any one of the first to fifth charging devices described above, wherein the first holding body and the second holding body are on the upstream side and the downstream side in the flow direction of air. It is preferable that the number and length of the wire electrodes be different between the discharge electrode that is divided into two, and that the upstream side sandwiching member sandwiches the discharge electrode and the downstream side sandwiching member sandwiches the discharge electrode.

  According to the sixth charging device of the present invention, by changing the number and the length of the line electrodes of the discharge electrode, it is possible to provide a charging device suitable for the use.

  The seventh charging device of the present invention is any one of the first to sixth charging devices described above, wherein the first holding body and the second holding body are on the upstream side and the downstream side in the flow direction of air. The pitch between the line electrodes of the discharge electrode which is divided into two and which is held by the holding member on the upstream side and the discharge electrode which is held by the holding member on the downstream side is half a pitch, circumferential direction It is preferable that they are arranged offset.

  According to the seventh charging device of the present invention, the charging efficiency can be improved by arranging the other discharge electrode at the central position between the discharge electrodes having the weakest load power.

  An eighth charging apparatus according to the present invention is the charging apparatus according to any one of the second to seventh aspects, wherein the fixing means is at least one of the first plate-like member and the second plate-like member. It is preferable to be comprised by the projection part provided in the edge part of the distribution direction of the air of the plate-shaped member.

  According to the eighth charging device of the present invention, it is possible to easily fix the first plate member and the second plate member by bending the protrusion.

  The ninth charging apparatus of the present invention is the eighth charging apparatus described above, wherein the discharge electrodes are intermittently arranged at predetermined intervals, and the protrusions are preferably arranged between the discharge electrodes. .

  According to the ninth charging device of the present invention, it is possible to prevent the discharge interference between the discharge electrodes and to improve the charging efficiency by arranging intermittently. Further, since the protrusions are provided between the discharge electrodes, the arrangement of the discharge electrodes and the charging efficiency are not adversely affected.

  The tenth charging apparatus of the present invention is the charging apparatus according to the eighth or ninth charging apparatus, wherein the first plate member and the second plate member have different plate thicknesses, and the protrusion has a plate thickness. Preferably, the thin plate-like member is provided with a notch at the base of the protrusion.

  According to the tenth charging device of the present invention, the projection is provided on the thinner plate-like member, and the root portion of the projection is notched, so the projection can be easily bent to improve usability. be able to.

  An eleventh electrostatic precipitator according to the present invention is an electrostatic precipitator including any of the above-described second to tenth charging devices, wherein one end is closed by an end face portion and the other end is opened. An outer cylindrical body formed as a cylindrical ground electrode and a cylindrical ground electrode open at both ends are formed with a gap between the outer cylindrical body and the outer cylindrical body. Preferably, the discharge electrode is provided in a state where the discharge electrode is electrically insulated from the outer cylinder and the inner cylinder in the gap.

  According to the eleventh electrostatic precipitator of the present invention, an electrostatic precipitator excellent in charge efficiency can be provided.

  According to a twelfth electrostatic precipitator of the present invention, in the above-mentioned eleventh electrostatic precipitator, a recess is formed in the end face portion of the outer cylinder, and air flows so as to be directed to the end face portion Preferably, an air flow path is provided.

  According to the twelfth electrostatic precipitator of the present invention, relatively large particles can be separated from the air by the air contacting the end face portion or changing the flow direction, and the load on the upstream side As a result, the dust collection efficiency can be improved. Further, the strength of the ground electrode can be improved.

  The thirteenth electrostatic precipitator of the present invention is characterized in that, in the above-described eleventh or twelfth electrostatic precipitator, the air flow channel is circulated toward the end face portion, and then the other end of the outer cylinder is provided. After being reversed on the side and flowing into the gap between the outer cylinder and the inner cylinder and flowing from the other end toward the one end, the air flow direction is reversed to inside the inner cylinder from one end to the other It is preferable to form so that it may distribute | circulate toward an end, and the outer collar part is formed in the other end part of the said inner cylinder.

  According to the thirteenth electrostatic precipitator of the present invention, when the particles attached to the charging device or the particles collected to the outer cylinder and the inner cylinder fall, they are stored in the mantle, so they are separately stored. It is not necessary to provide an oil pan, which can enhance the economic efficiency.

  According to the present invention, the charging efficiency can be improved, and the bundled fibrous electrode can be prevented from coming off and the wire electrode can be easily replaced.

It is a perspective view which shows the electrostatic precipitator which concerns on one Embodiment of this invention from diagonally upward. It is a perspective view which shows the inside of the electrostatic precipitator which concerns on one Embodiment of this invention from diagonally upward. It is a perspective view which shows the inside of the electrostatic precipitator which concerns on one Embodiment of this invention from diagonally downward. It is a sectional view showing the electric precipitator concerning one embodiment of the present invention. (A) is a perspective view which shows the charging device which concerns on one Embodiment of this invention, (B) is a perspective view which expands and shows A part. (A) is a perspective view which disassembles and shows the charging device which concerns on one Embodiment of this invention, (B) is a perspective view which expands and shows B part. It is sectional drawing which expands and shows a part of charging device of one Embodiment of this invention. It is a side view which shows typically the modification of the electrode for discharge in the charging device of one Embodiment of this invention.

  Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. Note that "U" shown in the drawing indicates "upper" and "D" indicates "lower".

[Electric dust collector]
The electrostatic precipitator 1 according to the present embodiment will be described with reference to FIGS. 1 to 4. 1 is a perspective view showing the electrostatic precipitator 1 from diagonally above, FIG. 2 is a perspective view showing the interior of the electrostatic precipitator 1 from diagonally above, and FIG. 3 is a perspective view of the interior of the electrostatic precipitator 1 from diagonally below FIG. 4 is a cross-sectional view showing the electrostatic precipitator 1.

  The electrostatic precipitator 1 is a device that charges and collects particles in air by corona discharge. Although not shown, for example, the electrostatic precipitator 1 is incorporated into a smokeless rooster that sucks in and discharges particles such as moisture (smoke), oil mist, oil mist and the like generated from foodstuffs and the like burned with a cooking device. It is done. The cooker is fixed to the inside of a bathtub-like housing frame 60 (see FIG. 4) embedded in the table. At the bottom of the housing frame 60, the upstream end of an exhaust duct 61 (see FIG. 4) communicating with the outside (outdoor) is provided to project. The electrostatic precipitator 1 is provided in the accommodation frame 60 adjacent to the side of the cooker and connected to the upstream end of the exhaust duct 61. On the downstream side of the exhaust duct 61, a suction fan (not shown) is provided which exerts a suction force on the inside of the electrostatic precipitator 1 and the housing frame 60 via the exhaust duct 61.

  The electrostatic precipitator 1 includes an outer cylindrical body 10, an inner cylindrical body 11, and a charging device 70. The charging device 70 includes a discharge portion 12, a power feeding insulator 13 and two supporting forceps. And a high voltage power supply unit 15. The outer cylindrical body 10 and the inner cylindrical body 11 are ground electrodes connected to a reference potential point (for example, the ground or the like). The discharge portion 12 includes a discharge electrode 30 that generates a corona discharge between the outer cylindrical body 10 and the inner cylindrical body 11. The feed insulator 13 and each support insulator 14 electrically insulate between the outer cylinder 10 and the discharge portion 12. In the following description, the “flow direction” refers to the direction in which air flows. Also, “upstream” and “downstream” and similar terms refer to “upstream” and “downstream” and similar concepts in the flow direction of air.

<External cylinder>
The outer cylindrical body 10 is composed of an upper outer cylindrical body 16 and a lower outer cylindrical body 17 and is made of, for example, stainless steel which is excellent in noncombustibility, conductivity and corrosion resistance. The upper outer cylindrical body 16 is formed in a substantially cylindrical shape having an upper end (one end) closed by the end face portion 16A and an open lower end (the other end). A recess 18 is formed in the central portion of the end face portion 16A of the upper outer cylinder 16 mainly for the purpose of improving the strength. One feed hole 19 (see FIG. 4) and two support holes 20 are opened slightly below the peripheral wall 16B of the upper outer cylinder 16 in the vertical direction. A total of three holes 19 and 20 are formed at substantially equal intervals (approximately 120 degrees intervals) in the circumferential direction of the upper outer cylinder 16. The diameter of the power supply holes 19 is set to be larger than that of each support hole 20. Although details will be described later, the power supply insulator 13 and the two support insulators 14 are disposed corresponding to the three holes 19 and 20. Further, in the peripheral wall 16B of the upper outer cylindrical body 16, three engagement holes 21 are formed below the power supply holes 19 and the support holes 20. The three engagement holes 21 are formed at substantially equal intervals (approximately 120 degrees intervals) in the circumferential direction of the upper outer cylindrical body 16.

  The lower outer cylinder 17 is formed in an annular shape, and a bottom surface portion 17A formed on the outer peripheral portion, an outer peripheral wall 17B rising from an outer peripheral portion of the bottom surface portion 17A, and an inner peripheral wall rising from an inner peripheral portion of the bottom surface portion 17A. And 17C. A plurality of suction ports 22 are opened in the bottom surface portion 17A of the lower outer cylindrical body 17. Each suction port 22 is divided into a predetermined size in order to prevent a finger from contacting the discharge portion 12 through the suction port 22 at the time of maintenance. On the outer peripheral wall 17B of the lower outer cylindrical body 17, convex portions 23 are formed at positions corresponding to the respective engagement holes 21 of the upper outer cylindrical body 16. Each protrusion 23 is formed so as to protrude inward, and can be engaged with each engagement hole 21 of the upper outer cylinder 16. Thereby, the upper outer cylinder 16 and the lower outer cylinder 17 are detachable.

<Inner cylinder>
The inner cylinder 11 is formed in a substantially cylindrical shape in which both ends in the vertical direction are opened, and similarly to the outer cylinder 10, is formed of stainless steel. The inner cylindrical body 11 is configured of a cylindrical main body portion 24 and a widening portion 25 formed below the main body portion 24. The main body portion 24 is set to have a diameter (outer diameter) smaller than that of the outer cylindrical body 10, and is provided so as to form a gap with the peripheral wall 16B of the upper outer cylindrical body 16. Further, the main body portion 24 is set shorter in the vertical direction than the outer cylindrical body 10, and is provided so as to form a gap between it and the end face portion 16A of the upper outer cylindrical body 16.

  The widening portion 25 is formed to extend outward and downward from the lower end of the main body portion 24, and the exhaust duct 61 is connected to the lower side. The widening portion 25 includes a step portion 26 horizontally formed with the main body portion 24, an inclined portion 27 extending outward and downward from the step portion 26, and an outer portion extending horizontally outward from the lower end of the inclined portion 27. It is comprised by the collar part 28 and. The stepped portion 26 is formed to support the inner peripheral corner portion of the lower outer cylinder 17. Thereby, the lower outer cylindrical body 17 fits the inner cylindrical body 11 so that the distance between the outer cylindrical body 10 and the inner cylindrical body 11 is set by the lower outer cylindrical body 17. Further, the outer cylindrical body 10 is attachable to the inner cylindrical body 11 from the upper direction, and is removable in the upper direction.

  The worker grips the mantle 28 when attaching and detaching the inner cylindrical body 11 to the exhaust duct 61 for maintenance etc., so that the operator's hand is not injured at this time, The tip portion is formed to be curled and rounded. In addition, the outer jacket portion 28 is an oil droplet which falls after adhering to the discharge electrode 30, an oil droplet which falls after being collected to the outer cylindrical body 10 or the inner cylindrical body 11, dust in dusty air, etc. Can also be stored. In FIG. 4, the radial dimension of the outer collar portion 28 is substantially the same as the outer diameter of the outer cylinder 10, but may be set larger than the outer diameter of the outer cylinder 10. .

<Discharger>
As shown in FIGS. 5 to 7, the discharge portion 12 includes a plurality of discharge electrodes 30 and a substantially cylindrical (substantially annular) support cylinder 31 that supports the respective discharge electrodes 30. .

(Electrode for discharge)
Each discharge electrode 30 is formed in a brush shape by bundling a plurality of fibrous line electrodes 30A. The wire electrode 30A is a stainless steel fiber with a diameter of 12 μm. In the present embodiment, one discharge electrode 30 is formed, for example, by bundling about 100 of the line electrodes 30A. The plurality of discharge electrodes 30 are provided in a state of extending from the support cylinder 31 toward the upper and lower sides (upstream and downstream sides in the flow direction).

  The plurality of discharge electrodes 30 are all formed to have substantially the same overall length, and the tips of the plurality of discharge electrodes 30 are substantially aligned. The protruding length of each discharge electrode 30 (the length from the upper end (lower end) of the support cylinder 31 to the tip of each discharge electrode 30) is set to about 5 mm. The plurality of discharge electrodes 30 are intermittently provided in a state of being arranged at substantially equal intervals (for example, about 5 mm) along the circumferential direction of the support cylinder 31. The plurality of discharge electrodes 30 are arranged in the same phase in the upper portion and the lower portion of the support cylinder 31. That is, the pair of discharge electrodes 30 facing each other in the vertical direction with the support cylinder 31 interposed therebetween is provided on a straight line extending in the vertical direction. Thus, by arranging the plurality of discharge electrodes 30 intermittently, discharge interference between the line electrodes 30A can be prevented, and charge efficiency can be improved.

(Support cylinder)
The support cylinder 31 is shorter in the vertical direction than the inner cylinder 11, and is formed in a substantially cylindrical shape (substantially annular shape) in which both ends in the vertical direction are open. The diameter (outer diameter) of the support cylinder 31 is set smaller than the outer cylinder 10 and larger than the inner cylinder 11. The support cylindrical body 31 is an inner holding body 32 as a first holding body and an outer holding body as a second holding body for holding the discharge electrode 30 from both inside and outside so that the tip end portion of the discharge electrode 30 protrudes. 33, a ring body 34 as a first plate-like member and a thin plate as a second plate-like member for further sandwiching the inner holding body 32 and the outer holding body 33 holding the discharge electrode 30 from the inner and outer sides And 35 are configured.

  The inner holding body 32 and the outer holding body 33 are both made of tape, and are separately formed in the present embodiment. The inner holding body 32 is made of a conductive double-sided tape containing carbon, and is configured by forming conductive adhesive layers 32B and 32C on the inner and outer surfaces of the conductive base 32A. The inner holding body 32 is disposed to face the ring body 34 to which a high voltage is applied, and is bonded to the ring body 34 via the inner adhesive layer 32B.

  The outer holding body 33 is configured by forming an adhesive layer 33B having conductivity on the inner surface of an aluminum base 33A. In the present embodiment, since a high voltage is applied from the inner holding body 32 side, the base 33A and the adhesive layer 33B of the outer holding body 33 may not have conductivity. The inner holding body 32 and the outer holding body 33 are bonded to each other through the adhesive layer 32C and the adhesive layer 33B, and fix the discharge electrode 30.

  The outer holding body 33 is disposed to face the thin plate 35 and is in contact with the thin plate 35 without an adhesive layer interposed therebetween. This facilitates replacement work of the holding body 36 in the case where the holding body 36 (one having the discharge electrode 30 held between the inner holding body 32 and the outer holding body 33) is deteriorated due to cleaning or the like and needs replacement. You can do it. In the present embodiment, the holding body 36 is divided into two in the vertical direction (distribution direction), and divided into three in the circumferential direction. In this case, the holding body 36 may be integrated in the vertical direction without being divided in the vertical direction. Moreover, although the clamping body 36 is divided into 3 in order to prevent interference with the forceps 13 for electric power feeding and the forceps 14 for support, this division | segmentation number may be changed with the number of forceps 13 and 14. FIG.

  As well shown in FIG. 6 (A), the ring body 34 is a belt-like conductive plate member having a feed screw hole 37 formed at both ends and bent into a ring shape. The ring shape is maintained by polymerizing the part and inserting the feed screw 38 into the hole 37. The ring body 34 is in contact with the screw head 38A of the feed screw 38 so that a high voltage is applied. One end of the ring body 34 has a stepped shape, and the outer surface forms a smooth curved surface when the both ends are polymerized. The inner holding body 32 is adhered to the outer surface of the ring body 34 via the adhesive layer 32B. The adhesive strength of the adhesive layer 32B of the inner holding body 32 is such that the holding body 36 can be easily peeled off from the outer surface of the ring body 34 in consideration of the case where the holding body 36 is deteriorated and replaced by cleaning or the like. It is set to strength. The ring body 34 is made of, for example, stainless steel having a thickness of 1 mm, has a thickness greater than the thickness 0.3 mm of the thin plate 35, and is less likely to rust even after cleaning. In addition to the feed screw holes 37, two support forceps holes 39 are formed in the ring body 34, and the feed screw holes 37 and the two support forceps holes 39 are equally spaced in the circumferential direction (120 Interval)).

  As well shown in FIG. 6A, the thin plate 35 is formed by bending the strip-like plate-like member into a ring shape having a gap at both ends along the ring body 34. In a gap between both ends of the thin plate 35, a feeding insulator 13 (see FIG. 4) and the like are arranged. The thin plate 35 may be manufactured in advance in a ring shape. The thin plate 35 is made of 0.3 mm stainless steel having a thickness smaller than that of the ring body 34. Therefore, the thin plate 35 is hard to rust even when cleaned, and easily formed in a ring shape.

  In the thin plate 35, laterally long holes 41 are formed at two places. Each long hole 41 is provided at a position corresponding to the support forceps hole 39 of the ring body 34. By providing the long hole 41, when assembling the thin plate 35 to the ring body 34 to which the holding member 36 is adhered, assembly is possible because the ring body 34 or the thin plate 35 can be assembled even if the ring 34 or the thin plate 35 deviates to some extent. It can be done.

  At the upper and lower edge portions of the thin plate 35, protrusions 42 are formed as fixing means. The protrusions 42 are formed at regular intervals along the circumferential direction between the line electrodes 30A of the discharge electrode 30. In the present embodiment, the projections 42 are formed at a total of 14 locations at seven locations on one edge. The number of protrusions 42 is appropriately determined by the size of the ring body 34.

  As well shown in FIG. 6 (B), the root portion of the projection 42 has a notch 42A so as to be easily bent. The thin plate 35 is fixed to the ring body 34 by bending the protrusions 42 inward and locking to the upper and lower edge portions of the ring body 34, and the holding body 36 is held in a state of being held between the thin plate 35 and the ring body 34 Ru. The bent projections 42 can be easily released from the bent state. Thus, the pinching body 36 can be removed relatively easily, so that the pinching body 36 can be easily replaced when the discharge electrode 30 is damaged or worn by abnormal discharge. Since the ring body 34 and the thin plate 35 can be reused by making the clamping body 36 exchangeable, it is possible to improve the economic efficiency. In the present embodiment, the projection 42 is provided on the thin plate 35 thinner than the ring body 34. Alternatively, the projection 42 may be provided on the ring body 34 or on both the ring body 34 and the thin plate 35. Good.

<Power feed ladder>
As shown in FIGS. 1 to 4, the power supply insulator 13 is made of, for example, porcelain or pottery or a resin having excellent electrical insulation, and is supported by the upper outer cylinder 16. The feed forceps 13 includes a plate-like portion 43 disposed outside the outer cylinder 10, and a body 44 disposed between the outer cylinder 10 and the support cylinder 31 through the feed hole 19. The screw holes 45 in which the feed screw 38 can be screwed in the radial direction are formed in the plate-like portion 43 and the body portion 44. The screw hole 45 may be formed by a through hole in which a screw thread is not formed. The feed screw 38 is inserted into the screw hole 45 from the inside through the feed screw hole 37 of the ring body 34, and the tip 38 B of the feed screw 38 protrudes from the outer surface of the plate 43. The plate-like portion 43 has a horizontally elongated shape extending in the tangential direction of the outer cylindrical body 10, and flange portions 46 are formed at the left and right ends thereof. The positioning convex part 40 of the feed plate 47 is protruded from the outer surface of the plate-like part 43, and the feed plate 47 is fixed to the feed ladder 13 by screwing the nut 48 to the tip 38B of the feed screw 38. Ru. The feed plate 47 is in electrical contact with the high voltage power supply unit 15.

  The body portion 44 has a cylindrical shape, and the outer peripheral surface 44A is formed to be uneven. A protective forceps 49 is provided on the outer periphery of the body 44 so as to surround the body 44. The protective insulator 49 is made of, for example, porcelain or pottery or a resin having excellent electrical insulation. The forceps 49 for protection is formed in a cylindrical shape having flanges 49A and 49B at the inner and outer end parts, and the flanges 49A and 49B stably provide a predetermined interval between the outer cylinder 10 and the discharge part 12 Can be maintained. By thus forming the feed ladder 13, a high voltage is applied to each discharge electrode 30 from the high voltage power supply unit 15 via the feed plate 47, the feed screw 38, the ring body 34, and the inner holding body 32. It is designed to be applied. At this time, since the creeping distance between the feed screw 38 and the feed hole 19 of the outer cylinder 10 can be increased by the protective insulator 49, the creepage leak (surface) between the feed screw 38 and the feed hole 19 can be obtained. Discharge) can be prevented, and a high voltage can be applied stably. The protective forceps 49 may not necessarily be provided.

<Support forceps>
The two support insulators 14 are respectively formed of, for example, porcelain or pottery or a resin having excellent electrical insulation, and are supported by the upper outer cylinder 16. As shown in FIGS. 5 to 6, each support forceps 14 is formed in a cylindrical shape having flanges 14A and 14B at the inner and outer ends, and the outer cylinder 10 is formed by the flanges 14A and 14B. And the discharge part 12 can be stably maintained at a predetermined interval. A groove 54 for a snap ring 53 is formed on the inner side of the inner flange 14A of each support forceps 14. The groove portion 54 is inserted into the support forceps hole 39 and the long hole 41, and the snap ring 53 is fixed to the groove portion 54 from the inside of the thin plate 35 so that each support forceps 14 is fixed to the support cylinder 31 Be done. Further, a groove 55 engageable with the support hole 20 (see FIG. 1) of the upper outer cylindrical body 16 is formed on the outer side of the outer side collar portion 14B of each support forceps 14. Each support forceps 14 is fixed to the upper outer cylindrical body 16 by engaging each support hole 20 with the groove 55. At this time, each support hole 20 is closed by the outer flange portion 14B of each support forceps.

<High-voltage power supply unit>
As shown in FIG. 1, the high voltage power supply unit 15 includes a high voltage transformer 15A, a voltage doubling unit 15B, and a limit switch 15C. The high voltage power supply unit 15 applies a high voltage between the discharge electrodes 30 and the cylinders 10 and 11. The high voltage transformer 15A boosts the AC voltage of the main power supply P (commercial power supply). The voltage doubling unit 15B converts the AC voltage boosted by the high voltage transformer 15A into a DC voltage and further boosts the voltage to generate a high voltage of about 5 kV. The voltage doubling unit 15B also functions as an output control unit that controls application of a high voltage to the discharge electrode 30. The limit switch 15C is in the closed state (ON state) when the electrostatic precipitator 1 is mounted on the housing frame 60, and is in the open state (OFF state) when the electrostatic precipitator 1 is detached from the housing frame 60.

[Assembly of charging device]
Here, the assembly procedure of the charging device 70 will be described.
First, the worker adheres the inner surface of the inner holding body 32 to the outer peripheral surface of the ring body 34 via the adhesive layer 32B. At this time, the upper and lower end surfaces of the ring body 34 and the upper and lower end surfaces of the sandwiching body 36 are aligned, and the discharge electrodes 30 are adhered so as to protrude upstream and downstream in the air flow direction from the ring body 34.

  Next, the thin plate 35 is wound on the outside of the holding body 36 while aligning the upper and lower end faces of the ring body 34 and the holding body 36 with the upper and lower end faces of the thin plate 35, and then using the tool such as a pliers 42 is bent inward and locked to the ring body 34. At this time, since the thin plate 35 has a thin plate shape, it can be easily wound along the shape of the ring body 34, but it is processed in advance into a ring shape along the shape of the ring body 34 It may be done.

  Next, the retaining ring (snap ring) 53 is fixed to the inner groove 54 of the two support forceps 14 to fix each support forceps 14 to the support cylindrical body 31, and the outer groove of each support forceps 14 Each support forceps 14 is fixed to the outer cylindrical body 10 by engaging the support holes 20 with 55.

  The above procedure completes the assembly of the charging device 70. The feeding insulators 13 and the supporting insulators 14 are attached when assembling the outer cylinder 10 of the electrostatic precipitator 1 as described above, whereby the support cylinder 31 (each discharge electrode 30) is It is attached to the outer cylinder 10 and the inner cylinder 11 in the state electrically insulated between the outer cylinder 10 and the inner cylinder 11. Further, in this state, the outer cylindrical body 10, the inner cylindrical body 11, and the support cylindrical body 31 are disposed on the same axial center (concentric circle). Furthermore, the assembled electrostatic precipitator 1 is housed in the housing frame 60 and connected to the upstream end of the exhaust duct 61.

<Air flow path>
As shown in FIG. 4, an air flow path 71 is formed on the outside and the inside of the electrostatic precipitator 1. The air flow channel 71 includes a first flow channel 71A, a second flow channel 71B, and a third flow channel 71C.

  The first flow path 71 </ b> A is formed between the outer peripheral surface of the outer cylindrical body 10 and the side surface of the housing frame 60. The first flow path 71 </ b> A extends in the up-down direction along the outer peripheral surface of the outer cylindrical body 10. In the first flow path 71A, air flows from the upper side to the lower side. The second flow path 72 </ b> B is formed to extend in the vertical direction between the inner peripheral surface of the outer cylindrical body 10 and the outer peripheral surface of the inner cylindrical body 11. In the second flow path 71B, air reversed at the lower end (downstream end) of the first flow path 71A flows from the lower side to the upper side. The third flow path 71 </ b> C is formed in the inner cylindrical body 11 so as to extend in the vertical direction. In the third flow path 71C, air reversed at the upper end (downstream end) of the second flow path 71B flows downward from above. The downstream end of the third flow path 71 </ b> C is connected to the upstream end of the exhaust duct 61.

  As described above, since the air flow path 71 reverses the air flow direction twice at the downstream end of the first flow path 71A and the downstream end of the second flow path 71B, it has a substantially S-shape as a whole. It is formed.

[Operation of electrostatic precipitator]
Next, the operation of the electrostatic precipitator 1 will be described.
Air containing particles such as oil smoke generated from the food material burned by the cooking device is sucked into the housing frame 60 from the suction port of the cooking device by the suction force of the suction fan and flows toward the electrostatic precipitator 1. As shown in FIG. 4, air containing particles collides with the end face portion 16A provided on the upstream side in the flow direction and is slightly decelerated, and along the end face portion 16A and the first flow path 71A from the upper side to the lower side Flow toward At this time, some of the relatively large particles are separated from the air and stored in the recess 18. The end face portion 16A of the upper outer cylindrical body 16 may be formed so as to be inclined toward the recess 18 so that the particles separated by the collision of air can easily face the recess 18.

  After the air containing the particles flows to the downstream end of the first flow path 71A, the flow direction is reversed (U-turned) and flows into the second flow path 71B. At this time, since the air containing the particles is rapidly diverted from the first flow path 71A toward the second flow path 71B, the particles in the air having a relatively large particle size and a heavy weight (for example, droplets or the like) Fire powder etc.) is separated from air by centrifugal force etc. At that time, a part of the separated particles is stored in the mantle portion 28, and the other separated particles fall into the collection portion 72 formed in the lower part of the accommodation frame 60 (around the exhaust duct 61). , Will be collected.

  Next, air containing particles flows from the lower side to the upper side along the second flow path 71B. The high voltage power supply unit 15 applies a high voltage between the discharge unit 12 disposed in the middle of the second flow path 71B and the cylinders 10 and 11. Then, corona discharge (negative polarity corona) is generated by the electric field generated around each discharge electrode 30.

  As shown in FIG. 4, the corona discharge forms a substantially conical charging area EA between the tip of each discharge electrode 40 and the outer cylinder 10. Further, the corona discharge forms a substantially conical charging area EA between the tip of each discharge electrode 30 and the inner cylindrical body 11. The corona discharge charges particles in the air flowing through the second flow path 71B (charging area EA). The charged particles are attracted to and attracted to the inner peripheral surface of the outer cylinder 10 or the outer peripheral surface of the inner cylinder 11 which is a ground electrode. That is, particles in the air are separated from the air and collected on the surfaces of the cylinders 10 and 11.

  As shown in FIG. 4, the air flowing into the second flow path 71 B is the air flowing between the outer cylinder 10 and the support cylinder 31, and the air flowing between the inner cylinder 11 and the support cylinder 31. It is diverted to The air having passed between the inner cylinder 11 and the support cylinder 31 passes through the charging area EA generated by the discharge electrode 30 on the downstream side (upper side), and then the air between the outer cylinder 10 and the support cylinder 31 Merge with the air that passed between. The combined air flows from the upper corner portion of the outer cylinder 10 along the end face portion 16A. For this reason, charged particles are collected in the vicinity of the upper corner portion of the outer cylindrical body 10 and the inner surface (lower surface) of the end face portion 16A.

  Next, after the air from which the particles are separated flows to the downstream end of the second flow path 71B, the flow direction is reversed (U-turn) and flows into the third flow path 71C. The air flows downward from above along the third flow path 71 </ b> C and flows into the exhaust duct 61. The charged particles may be adsorbed onto the outer peripheral surface of the inner cylinder 11 (see FIG. 4).

  Thus, air from which particles have been removed is exhausted to the outside through the exhaust duct 61. The particles collected by the mantle portion 28 and the recovery portion 62 are periodically recovered and removed. In addition, the particles collected in each of the cylindrical bodies 10 and 11 are removed at the time of periodic maintenance of the electrostatic precipitator 1. Specifically, particles collected in each of the cylindrical bodies 10 and 11 are removed by performing ultrasonic cleaning or the like using an alkaline detergent on the electrostatic precipitator 1 taken out of the storage frame 60. Ru.

[effect]
The charging device 70 of this embodiment needs to be periodically cleaned because it becomes dirty as the operation time passes. When washing, washing with a dishwasher is efficient. At this time, since the sandwiching body 36 is protected by the ring body 34 and the thin plate 35, the sandwiching body 36 is hard to hurt and there is little fear that the discharge electrode 40 may come off. Further, simply bending the tape-like adhesive causes the adhesive portion to extend and a gap to be easily formed, and in addition to the possibility of the fiber coming off, the shape of the tape is unstable because it is soft. However, in the charging device 70 of the present embodiment, since the holding body 36 is held between the ring body 34 and the thin plate 35, the adhesion between the discharge electrode 30 and the holding body 36 is improved, and the discharge electrode 30 is configured. It is difficult for the wire electrode 30A to come off. Therefore, the durability of the holding body 36 is improved.

  Further, in the charging device 70 of the present embodiment, since the holding body 36 is attached to the outer peripheral surface of the ring body 34, it can be easily removed from the ring body 34 if the thin plate 35 is removed. Therefore, when the pain of the line electrode 30A is severe or the wear is severe as the cleaning and the operation time elapse, the sandwiching body 36 can be easily replaced.

  Further, in the electrostatic precipitator 1 according to this embodiment, particles in the air are charged in the process of passing through the charging area EA, and the inner peripheral surface of the outer cylinder 10, the inner surface of the end face portion 16A, the inner cylinder 11 And the inner peripheral surface of the inner cylindrical body 11. According to this configuration, substantially the entire inner surface of the outer cylindrical body 10 and substantially the entire surface of the inner cylindrical body 11 can be used as a particle collection area. Thereby, since the collection area can be expanded, the collection amount of particles can be increased.

  Further, in the electrostatic precipitator 1 according to the present embodiment, the air containing particles makes a U-turn on the lower side of the outer cylinder 10 to make the particles having a relatively large particle size relatively heavy among the particles in the air (for example, Droplets, fire powder, etc.) can be separated from the air. Therefore, air containing a large amount of particles is prevented from flowing into the charging area EA, and the amount (number) of particles adhering to the discharge electrode 30 can be reduced. Thereby, appropriate corona discharge can be generated over a long period of time. Further, by suppressing the inflow of droplets, fire powder, etc. into the electrostatic precipitator 1, it is possible to prevent the malfunction of the electrostatic precipitator 1 and the ignition within the electrostatic precipitator 1 and the exhaust duct 61. it can. In addition, for example, since it is not necessary to dispose a demister or a prefilter or the like for separating and removing particles in the air in the air flow path 71, the manufacturing cost of the electrostatic precipitator 1 can be reduced. Furthermore, since the discharge electrode 30 is provided inside the outer cylinder 10 to be the ground electrode, for example, it is possible to prevent an operator from accidentally touching the discharge electrode 30 at the time of maintenance or the like. . Thus, the worker can safely perform maintenance work and the like, and also can prevent the deformation and breakage of the discharge electrode 30.

  Moreover, in the electrostatic precipitator 1 which concerns on this embodiment, the outer cylinder 10 is provided in the attitude | position which turned end surface part 16A vertically upward. According to this configuration, the particles in the air can be efficiently separated from the air by the U-turn of the air containing the particles at the lower portion outside the outer cylinder 10. Further, inside the outer cylinder 10, the second flow path 71B extends upward from the lower side, so that the entry of particles to the charging area EA can be effectively inhibited.

  Further, according to the electrostatic precipitator 1 according to the present embodiment, since the fibrous line electrode 30A is used as the discharge electrode 30, corona discharge is performed at a lower applied voltage than when a thick electrode is used. Can be generated. As a result, the generation of sparks can be suppressed, and the generation of ozone accompanying the ionization of air can also be suppressed. In addition, since the discharge electrodes 30 are provided on the upper and lower sides of the support cylinder 31 in the flow direction, the discharge electrodes 30 are provided compared to the case where the discharge electrodes 30 are provided on one side of the support cylinder 31 in the flow direction. The number can be increased. As a result, the location of occurrence of corona discharge is increased, whereby particles in the air can be efficiently charged.

[Modification]
In the charging device 70 according to the above-described embodiment, the phases and lengths of the discharge electrodes 30 on the upstream side and the downstream side in the flow direction are set to the same, but the present invention is not limited to this embodiment. Absent. For example, as shown in FIG. 8, the downstream discharge electrode 30 fixed to the lower portion of the support cylinder 31 and the upstream discharge electrode 30 fixed to the upper portion of the support cylindrical member 31 are circumferentially separated. The phase may be shifted by 1⁄2 pitch. As a result, the downstream (upper) discharge electrode 30 can be disposed at the center position between the weakest upstream (lower) discharge electrodes 30 of the load power, and the charge efficiency can be improved. .

  Further, as shown in FIG. 8, depending on the use form and application of the charging device 70, the length L 1 of the upstream (lower) discharge electrode 30 is the length of the downstream (upper) discharge electrode 30. The length may be longer than L2, or the number of discharge electrodes 30 on the upstream side (lower side) may be larger than the number of discharge electrodes 30 on the downstream side (upper side). As a result, the load power from the upstream (lower) discharge electrode 30 in the central role can be higher than the load power from the downstream (upper) discharge electrode 30 in the auxiliary role. The current increases and the dust collection efficiency can be improved.

  Further, in the charging device 70 according to the present embodiment described above, the inner holding body 32 and the outer holding body 33 are separately configured, but the inner holding body 32 and the outer holding body 33 may be integrated. In this case, the inner holding body 32 and the outer holding body 33 are conductive foldable tapes, and the discharge electrode 30 obtained by bundling the wire electrodes 30A is held between the bent portions, and the discharge electrode 30 is held by bonding or pressure bonding. Fix it. Then, a conductive double-sided tape having a conductive adhesive layer formed on both sides thereof is adhered to the inner surface of the inner holding body 32 in contact with the ring body 34 to which a high voltage is applied. By fixing the body 34, a high voltage can be stably applied to the discharge electrode 30.

  Further, in the charging device 70 according to the present embodiment described above, a high voltage is applied to each of the discharge electrodes 30 from the high voltage power supply unit 15 via the ring body 34 and the inner clamping body 32. However, the structure of the power supply insulator 13 is changed so that a high voltage is applied to each of the discharge electrodes 30 from the high voltage power supply unit 15 via the thin plate 35 and the outer holding body 33. It is also good. In this case, the functions of the inner holding body 32 and the outer holding body 33 in the above-described embodiment are reversed, and the outer holding body 33 bonded to the thin plate 35 is formed of a conductive double-sided tape containing carbon.

  Moreover, in the electrostatic precipitator 1 which concerns on this embodiment, although the outer cylinder 10, the inner cylinder 11, and the support cylinder 31 are respectively formed in cylindrical shape, this invention is not limited to this. For example, the outer cylindrical body 10, the inner cylindrical body 11, and the support cylindrical body 31 may each be formed in a cylindrical shape having an elliptical cross section, or in an angular cylindrical shape having a polygonal cross section such as a triangle or a square. It may be formed. Further, the outer cylindrical body 10, the inner cylindrical body 11, and the support cylindrical body 31 are not limited to stainless steel, and may be formed of a metal such as iron, copper, or an aluminum alloy.

  Further, in the electrostatic precipitator 1 according to the present embodiment, the discharge electrode 30 fixed to the upper part of the support cylinder 31 and the discharge electrode 30 fixed to the lower part of the support cylinder 31 are separated. The invention is not limited to this. For example, the discharge electrode 30 may be formed to penetrate through the support cylinder 31 in the vertical direction and to protrude from the upper and lower ends of the support cylinder 31. That is, the upper discharge electrode 30 and the lower discharge electrode 30 may be connected to one.

  Moreover, although the inner side clamping body 32 which concerns on this embodiment is a product made from the electroconductive double-sided tape containing carbon, this invention is not limited to this. That is, any double-sided tape having conductivity may be used. In addition, in the electrostatic precipitator 1 according to the present embodiment, the support cylindrical body 31 is supported by the outer cylindrical body 10 via the three insulators 13 and 14, but the present invention is not limited to this.

  The description of the above embodiment shows one aspect of the charging device and the electrostatic precipitator according to the present invention, and the technical scope of the present invention is not limited to the above embodiment.

  The technique of the present invention can be used for a smokeless roaster or the like that sucks and collects oil smoke generated during cooking. Moreover, it can also be utilized for an air cleaner etc. which collect | recovers particle | grains, such as pollen in air, and smoke of a cigarette, indoors. Furthermore, it may also be used for an air supply duct device for taking in air into which air has been removed dust (particles) from air outside the room, and an exhaust duct for exhausting air for which air removed from dust (particles) from room air is discharged to the room outside. it can.

DESCRIPTION OF SYMBOLS 1 electrostatic precipitator 10 outer cylinder 11 inner cylinder 13 forceps 14 support insulator 16A end face 18 recessed portion 28 outer shell 30 discharge electrode 30A wire electrode 32 inner pinching body (first pinching body)
32B adhesive layer 32C adhesive layer 33 outer holding body (second holding body)
34 Ring body (first plate member)
35 Thin plate (second plate member)
42 Protrusions (fixing means)
70 charging device 71 air flow path

Claims (13)

A charging device for charging particles in air by corona discharge generated by application of high voltage, comprising:
A discharge electrode formed by bundling a plurality of fibrous line electrodes;
First and second pinching members sandwiching the discharge electrode from both sides so that the tip of the discharge electrode protrudes;
First and second plate members which further sandwich the first and second sandwiching members sandwiching the discharge electrode from both sides;
Equipped with
The first pinching body is disposed to face the first plate-like member, the second pinching body is disposed to face the second plate-like member, and the tip of the discharge electrode is Projecting from the first and second plate members toward the upstream side and the downstream side of the flow direction of air, and at least one plate of the first plate member and the second plate member And a high voltage is applied to the discharge electrode from at least one of the first holding body and the second holding body from the second member.   The first plate-like member and the second plate-like member are formed in a ring shape, and fixing means in a state in which the first and second holding members holding the discharge electrode are further held from both sides The charging device according to claim 1, wherein the charging devices are fixed to one another.   At least one of the first holding body and the second holding body to which a high voltage is applied is the first plate-like member to which the high voltage is applied and the first holding member via the adhesive layer. The charging device according to claim 1, wherein the charging device is fixed to at least one plate member of the two plate members, and the adhesive layer has conductivity.   3. The holding member according to claim 1, wherein at least one of the first holding member and the second holding member to which a high voltage is applied is made of a conductive material provided with an adhesive layer on both sides. Charging device.   The first sandwiching body and the second sandwiching body are divided into a plurality of pieces in the circumferential direction orthogonal to the flow direction of air with a gap therebetween, and a support insulator and a feeding insulator are provided in the gap. The charging device according to any one of claims 2 to 4.   The first sandwiching body and the second sandwiching body are divided into two on the upstream side and the downstream side in the flow direction of air, and the discharge electrode sandwiched by the upstream sandwiching body and the downstream sandwiching body The charging device according to any one of claims 1 to 5, wherein the number and the length of the wire electrodes are different from the discharge electrodes held by.   The first sandwiching body and the second sandwiching body are divided into two on the upstream side and the downstream side in the flow direction of air, and the discharge electrode sandwiched by the upstream sandwiching body and the downstream sandwiching body The charging device according to any one of claims 1 to 6, wherein a pitch between the line electrodes is shifted in the circumferential direction by a half pitch with the discharge electrodes held by.   The said fixing means is comprised by the projection part provided in the edge part of the distribution direction of the air of the plate-shaped member of at least any one of said 1st plate-shaped member and said 2nd plate-shaped member. The charging device according to any one of claims 2 to 7.   The charging device according to claim 8, wherein the discharge electrodes are intermittently arranged at predetermined intervals, and the protrusions are arranged between the discharge electrodes.   The first plate-like member and the second plate-like member are different in plate thickness, and the protrusion is provided on the plate-like member having a smaller plate thickness, and a notch is formed at a root portion of the protrusion 10. A charging device according to claim 8 or 9, wherein is formed. An electrostatic precipitator comprising the charging device according to any one of claims 2 to 10, comprising:
An outer cylindrical body formed as a cylindrical ground electrode, one end of which is closed by the end face portion and the other end of which is open;
An inner cylinder formed as a cylindrical ground electrode whose both ends are open, and provided inside the outer cylinder with a gap between the inner cylinder and the outer cylinder;
Equipped with
The electrostatic precipitator according to claim 1, wherein the discharge electrode is electrically insulated from the outer cylinder and the inner cylinder in the gap. A recess is formed in the end face portion of the outer cylinder,
12. The electrostatic precipitator according to claim 11, further comprising an air flow path through which air flows toward the end face. The air flow path circulates toward the end face portion, then reverses at the other end side of the outer cylindrical body and flows into the gap between the outer cylindrical body and the inner cylindrical body and from the other end to the one end After the air flows, the air flow direction is reversed to flow in the inner cylinder from one end to the other,
The electrostatic precipitator according to claim 11 or 12, wherein an outer collar portion is formed at the other end of the inner cylindrical body.

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