JP7078412B2 - Electrostatic precipitator - Google Patents

Description

The present invention relates to an electrostatic precipitator that charges and collects particles such as dust in dust-containing air and mist in oil smoke by a corona discharge generated by applying a high voltage.

A device that charges and collects particles in the air by corona discharge is known. For example, Patent Document 1 discloses an electrostatic precipitator in which a plurality of discharge portions and dust collectors are arranged along an air flow direction in order to suppress a decrease in dust collection efficiency (Patent Document 1). reference).

Japanese Patent Application Laid-Open No. 2003-126729

However, in the electrostatic precipitator described in Patent Document 1, since a plurality of discharge portions and dust collectors are arranged along the air flow direction, there is a problem that the apparatus becomes large in size. Further, since the feeding points to which the high voltage is applied are dispersed in a plurality of places, there is a problem that the number of parts is large and the economy is poor.

The present invention has been made to solve the above-mentioned problems, and it is possible to improve the dust collection efficiency and downsize the device, and to consolidate the feeding points into one place to reduce the number of parts. Provide an electrostatic precipitator that can reduce the amount and improve economic efficiency.

In order to achieve the above object, the first electrostatic dust collector of the present invention is an electrostatic dust collector that charges and collects particles in the air by corona discharge generated by application of a high voltage, and is a cylinder. An outer cylinder formed as a shaped ground electrode and a middle cylinder formed as a tubular ground electrode inside the outer cylinder and provided with a gap between the outer cylinder and the outer cylinder. , An inner cylinder formed as a tubular ground electrode inside the middle cylinder and provided through a gap between the inner cylinder and the outer cylinder and the middle cylinder. A plurality of first discharge electrodes supported by a first support cylinder provided in a state of being electrically insulated from the outer cylinder and the middle cylinder in the gap between the two, and the middle cylinder and the above. A plurality of second discharge electrodes supported by a second support cylinder provided in a state of being electrically insulated from the middle cylinder and the inner cylinder in a gap between the inner cylinder, and a plurality of second discharge electrodes. A power feeding member that applies a high voltage to the first discharge electrode via the first support cylinder and applies a high voltage to the second discharge electrode via the second support cylinder. It is characterized by having.

According to the first electrostatic precipitator of the present invention, a plurality of discharge electrodes are arranged by arranging discharge electrodes in the gap between the outer cylinder and the middle cylinder and in the gap between the middle cylinder and the inner cylinder, respectively. It is possible to realize miniaturization (compactness) of the device while providing the above. In addition, it is possible to deal with high-concentration dust and particles such as mist while improving the dust collection efficiency.

The second electrostatic dust collector of the present invention is the first electrostatic dust collector described above, in which one end surface of the outer cylinder body is open, one end surface of the middle cylinder body is closed, and the other end surface thereof. Is opened, both ends of the inner cylinder are opened, the other end of the outer cylinder and the other end of the inner cylinder are closed, and air is discharged from the one end surface of the outer cylinder. After flowing into the gap between the outer cylinder and the inner cylinder and flowing toward the other end, it reverses and flows into the gap between the inner cylinder and the inner cylinder. It is preferable to form an air flow path that flows toward the one end surface of the cylinder and is further inverted to flow into the inside of the inner cylinder.
In the third electrostatic precipitator of the present invention, in the above-mentioned second electrostatic precipitator, it is preferable that one end surface is an upper end surface and the other end surface is a lower end surface.

According to the second and third electrostatic precipitators of the present invention, by forming the air flow path in an S shape, the inner peripheral surface of the outer cylinder, the outer peripheral surface and the inner peripheral surface of the middle cylinder, and the inner surface are formed. Since the area (collection area) for adsorbing and collecting charged particles can be expanded on the outer peripheral surface and the inner peripheral surface of the cylinder, the amount of particles collected can be increased while reducing the size of the device. be able to.

The fourth electrostatic dust collector of the present invention is the first to third electrostatic dust collectors described above, in which the gap between the first discharge electrode and the outer cylinder and the first. The gap between the discharge electrode 1 and the middle cylinder, the gap between the second discharge electrode and the middle cylinder, and the second discharge electrode and the inner cylinder. It is preferable that the gaps between them have the same radial length.

According to the fourth electrostatic precipitator of the present invention, charged particles are adsorbed on the inner peripheral surface of the outer cylinder, the outer peripheral surface and the inner peripheral surface of the inner cylinder, and the outer peripheral surface and the inner peripheral surface of the inner cylinder. The area to be collected (collection area) can be effectively utilized without bias. Further, since the high voltage applied to the first and second discharge electrodes can be set to be the same, the same high voltage power supply unit can be used, and the economic efficiency can be improved.

The fifth electrostatic dust collector of the present invention is any one of the first to fourth electrostatic dust collectors described above, wherein the power feeding member applies a high voltage to the first discharge electrode. The power feeding member is provided with a power feeding member and a second power feeding member that applies a high voltage to the second discharging electrode, and the power feeding porcelain that protects the power feeding member includes the first power feeding member. The first body is provided with a first body that supports the second body in an electrically insulated state and a second body that supports the second power feeding member in an electrically insulated state. The portion is connected to the first support cylinder so as to penetrate the outer cylinder and block the gap between the outer cylinder and the middle cylinder, and the second body portion is the outer portion. It penetrates the cylinder to block the gap between the outer cylinder and the middle cylinder, and penetrates the middle cylinder to block the gap between the middle cylinder and the inner cylinder. It is preferable that it is connected to the second support cylinder.

According to the fifth electrostatic precipitator of the present invention, by feeding power from one feeding insulator to two places of the first and second discharging electrodes, the feeding insulator can be shared, which is economical. It can enhance the sex.

The sixth electrostatic precipitator of the present invention is the fifth electrostatic precipitator described above, wherein the second body portion is in the air flow direction from the first body portion and the first discharge electrode. It is preferable that they are arranged apart from each other on the downstream side of the.

According to the sixth electrostatic precipitator of the present invention, it is possible to realize power supply to two places from the same direction without affecting the discharge performance.

In the fifth or sixth electrostatic precipitator described above, the seventh electrostatic precipitator of the present invention includes a first power feeding plate connected to the first power feeding member and the second power feeding device. It is preferable that the first feeding plate and the second feeding plate are provided with a second feeding plate connected to the member, and the first feeding plate and the second feeding plate are arranged apart from each other on the same surface of the feeding insulator.
According to the seventh electrostatic precipitator of the present invention, power can be supplied to two locations from the same direction, so that the mechanism of power supply can be simplified.

The eighth electrostatic dust collector of the present invention is any one of the first to fourth electrostatic dust collectors described above, wherein the power feeding member penetrates the outer cylinder body and the middle cylinder body, and the outer cylinder is the outer cylinder. The first support cylinder and the second support are arranged so as to block the gap between the cylinder and the middle cylinder and the gap between the middle cylinder and the inner cylinder. It is preferably connected to the cylinder.

According to the eighth electrostatic precipitator of the present invention, a high voltage is applied to the first discharge electrode (support cylinder) and the second discharge electrode (support cylinder) by one power feeding member. Therefore, the number of parts can be reduced and the economic efficiency can be improved.

In the ninth electrostatic precipitator of the present invention, in any of the above-mentioned first to eighth electrostatic precipitators, the first discharge electrode and the second discharge electrode are in the form of a plurality of fibers. It is composed of a bundle of wire electrodes bundled with wire electrodes, and the bundle of wire electrodes extends from the first support cylinder and the second support cylinder toward the upstream side and the downstream side in the air flow direction, respectively. Is preferable.

According to the ninth electrostatic precipitator of the present invention, since the electric dust collector can be discharged at a relatively low voltage, the occurrence of a fire can be prevented and the safety can be improved. Further, since the number of discharge points can be increased, the fine particles in the air flow can be reliably charged.

In the tenth electrostatic collector of the present invention, in the ninth electric dust collector described above, the power applied to one bundle of wire electrodes of the second discharge electrode is the first discharge electrode. The distance between the wire electrode bundles of the second discharge electrode is set to be smaller than the distance between the wire electrode bundles of the first discharge electrode. It is preferable that the electrode is used.

According to the tenth electrostatic precipitator of the present invention, the influence of electric field interference between the wire electrode bundles can be reduced by suppressing the electric power applied per wire electrode bundle of the second discharge electrode to a small value. can. Further, by arranging the wire electrode bundles of the second discharge electrode at a high density, it is possible to reliably collect the particles that could not be collected by the first discharge electrode.

The eleventh electrostatic dust collector of the present invention includes a first high voltage power supply unit that supplies a high voltage to the first discharge electrode in any of the first to seventh electrostatic dust collectors described above. It is preferable that the second high voltage power supply unit that supplies a high voltage to the second discharge electrode is provided independently.

According to the eleventh electrostatic collector of the present invention, since the high voltage power supply unit is separately provided, even if one discharge electrode is short-circuited due to dust or dirt, the other discharge electrode can be used. There is no risk of excessive power being supplied. Therefore, it is possible to avoid the stoppage and failure of the device due to the frequent occurrence of abnormal discharge, and to ensure the safety.

The twelfth electrostatic collector of the present invention includes a first mode in which a high voltage is applied only to the first discharge electrode in the eleventh electrostatic collector described above according to preset conditions. One of a second mode in which a high voltage is applied only to the second discharge electrode and a third mode in which a high voltage is applied to the first discharge electrode and the second discharge electrode. It is preferable to have a control unit that controls switching to.

According to the twelfth electrostatic precipitator of the present invention, the mode suitable for the application can be properly used according to the preset conditions, so that the device can be operated efficiently.

According to the present invention, it is possible to improve the dust collection efficiency and to reduce the size of the apparatus. In addition, it is possible to reduce the number of parts and improve economic efficiency by consolidating the feeding points into one place.

It is a perspective view which shows the electric dust collector which concerns on 1st Embodiment of this invention from diagonally above. It is a perspective view which shows the inside of the electrostatic precipitator which concerns on 1st Embodiment of this invention from diagonally above through the outer cylinder body. It is a perspective view which shows the inside of the electrostatic precipitator which concerns on 1st Embodiment of this invention from diagonally above, seeing through the outer cylinder body and the upper middle cylinder body. It is a top view which shows the inside of the electrostatic precipitator which concerns on 1st Embodiment of this invention by removing the upper middle cylinder body. It is sectional drawing which shows the part of the electric dust collector which concerns on 1st Embodiment of this invention in an enlarged manner. It is a perspective view which shows the electric dust collector which concerns on 2nd Embodiment of this invention from diagonally above. It is sectional drawing which shows the part of the electric dust collector which concerns on 2nd Embodiment of this invention in an enlarged manner. It is sectional drawing which shows the part of the electric dust collector of the 3rd Embodiment of this invention in an enlarged manner.

Hereinafter, embodiments of the present invention will be described with reference to the attached drawings. In each figure, "U" indicates "upper" and "D" indicates "lower".
[Electrostatic precipitator according to the first embodiment]

The electrostatic precipitator 1 according to the first embodiment of the present invention will be described with reference to FIGS. 1 to 5. 1 is a perspective view showing the electrostatic precipitator 1 from diagonally above, FIG. 2 is a perspective view showing the inside of the electrostatic precipitator 1 from diagonally above, and FIG. 3 is a perspective view showing the inside of the electrostatic precipitator 1 from diagonally above. FIG. 4 is a plan view showing the inside of the electrostatic precipitator 1, and FIG. 5 is an enlarged sectional view showing a part of the electrostatic precipitator 1.

The electrostatic precipitator 1 according to the present embodiment is a device that charges and collects particles in the air by corona discharge. Although not shown, for example, the electrostatic precipitator 1 is a roaster or fryer that sucks and exhausts particles such as moisture, smoke (oil smoke), and oil mist generated from foodstuffs that have been baked or fried together with air. It is built into the cooker such as.

The electrostatic precipitator 1 is detachably attached to a housing frame 100 (see FIG. 5) inside the cooker. Particles such as moisture, smoke (oil smoke), and oil mist generated from foodstuffs and the like are sucked from the suction hood together with air, and flow into the electrostatic precipitator 1 from the suction port via the flow passage. An exhaust duct 101 (see FIG. 5) that communicates with the outside (outside the cooker) is connected to the bottom of the accommodation frame 100. The exhaust duct 101 is a metal pipe having a substantially circular cross section. On the downstream side of the exhaust duct 101, a suction fan (not shown) for exerting a suction force on the inside of the electrostatic precipitator 1, the inside of the accommodating frame 100, the suction hood, and the like is provided via the exhaust duct 101.

The electrostatic precipitator 1 includes an outer cylinder 10, an inner cylinder 11, an inner cylinder 12, a discharge unit 13, a power feeding insulator 14, a support insulator 15, and a high voltage power supply unit 16. I have. The outer cylinder 10, the middle cylinder 11, and the inner cylinder 12 are ground electrodes connected to a reference potential point (for example, the ground or the like). The outer cylinder 10, the middle cylinder 11, and the inner cylinder 12 are arranged concentrically, respectively, and the gap between the outer cylinder 10 and the middle cylinder 11 and the middle cylinder 11 and the inner cylinder 12 are arranged. The gap between the two is set to be equal (L1 + L2 = L3 + L4 in FIG. 5). In the following description, the "distribution direction" refers to the direction in which air flows. In addition, "upstream" and "downstream" and similar terms refer to "upstream" and "downstream" in the direction of air flow and similar concepts.
<Outer cylinder>

The outer cylinder 10 is made of, for example, stainless steel having excellent nonflammability, conductivity and corrosion resistance. The outer cylinder 10 is formed in a substantially cylindrical shape in which the upper end surface (one end surface) and the lower end surface (end end surface) are open. The upper end of the outer cylinder 10 is hemmed so as not to be injured when touched by a person. The lower end of the outer cylinder 10 is closed by fixing the lower portion of the peripheral wall 17 to the rising portion 33 of the inner cylinder 12, which will be described later. Two handles 18 are fixed at opposite positions on the upper portion of the peripheral wall 17 of the outer cylinder 10, and a power feeding insulator 14 is fixed between the two handles 18. Further, in the peripheral wall 17 of the outer cylinder 10, two feeding holes 19 (see FIG. 5), two feeding insulator mounting holes 20 (see FIG. 5), and two supporting insulator mounting holes (see FIG. 5). (Not shown), four handle mounting holes (not shown), and six inner cylinder fixing holes (holes in which the screw 42 is fixed) for fixing the inner cylinder 12 are opened.
<Middle cylinder>

The inner cylinder 11 is made of, for example, stainless steel having excellent nonflammability, conductivity and corrosion resistance. The middle cylinder 11 is composed of an upper middle cylinder 24 and a lower middle cylinder 25. The upper middle cylinder 24 is formed in a celestial cylindrical shape in which the upper end surface (one end surface) is closed by the end surface portion 26 and the lower end surface (the other end surface) is open. The diameter (outer diameter) of the upper middle cylinder 24 is set smaller than that of the outer cylinder 10, and is provided so as to form a gap between the upper middle cylinder 24 and the outer cylinder 10. A recess 27 is formed in the central portion of the end face portion 26 of the upper middle cylinder 24. Relatively large particles contained in the dust-containing air separated from the dust-containing air by changing the flow direction of the air can be stored in the recess 27. The end surface portion 26 of the upper middle cylinder body 24 is located slightly below the upper end surface (one end surface) of the outer cylinder body 10. The upper middle cylinder 24 is not fixed to the lower middle cylinder 25 with screws or the like, and has a removable structure. Thereby, at the time of maintenance, by removing the upper middle cylinder 24 from the lower middle cylinder 25, the second discharge electrode 44, which will be described later, can be visually confirmed from above to confirm the dirty state.

The lower middle cylinder 25 is formed in a substantially cylindrical shape with an upper end surface (one end surface) and a lower end surface (end end surface) open. At the lower end of the lower middle cylinder 25, an outer flange portion 28 extending horizontally to the outer cylinder body 10 side is formed, and this outer flange portion 28 is fixed to the overhanging portion 32 of the inner cylinder body 12 described later by a screw 23. Will be done. At the lower part of the lower middle cylinder 25, a plurality of (for example, 24) openings 29 are formed at regular intervals in the circumferential direction. Further, in the lower middle cylinder 25, a through hole 30 for the second body portion 47 of the power feeding insulator 14, which will be described later, is formed at one place above the opening 29.
<Inner cylinder>

The inner cylinder 12 is made of stainless steel like the outer cylinder 10 and the middle cylinder 11. The inner cylinder 12 has a main body portion 31 which is shorter in the vertical direction than the outer cylinder 10 and the middle cylinder 11 and is formed in a cylindrical shape with both upper and lower surfaces open in the vertical direction. At the lower end (the other end) of the main body 31, an overhanging portion 32 extending horizontally to the outer cylinder 10 side is formed. A rising portion 33 that bends upward is formed at the tip of the overhanging portion 32, and the rising portion 33 is fixed to the lower end portion of the outer cylinder 10 by a screw 42. The diameter (outer diameter) of the main body 31 of the inner cylinder 12 is set to be smaller than that of the middle cylinder 11, and is provided so as to form a gap between the inner cylinder 12 and the main body 11. Two support insulator mounting holes (not shown) are opened in the main body 31 of the inner cylinder 12.
<Discharge part>

The discharge unit 13 includes a support cylinder 37 and a plurality of discharge electrodes 38 supported by the support cylinder. The support cylinder 37 is made of stainless steel like the outer cylinder 10, the middle cylinder 11, and the inner cylinder 12. The support cylinder 37 is formed in a cylindrical shape with both upper and lower end surfaces open, and is configured such that the inner cylinder is in close contact (or crimped) with the inside of the outer cylinder. The support cylinder 37 is arranged concentrically with the outer cylinder 10, the middle cylinder 11, and the inner cylinder 12.

The support cylinder 37 is a first support cylinder 39 provided between the outer cylinder 10 and the middle cylinder 11 in a state of being electrically insulated from the outer cylinder 10 and the middle cylinder 11, and the middle. A second support cylinder 40 provided between the cylinder 11 and the inner cylinder 12 in a state of being electrically insulated from the middle cylinder 11 and the inner cylinder 12 is provided. The first support cylinder 39 and the second support cylinder 40 are each opened with one power feeding screw hole 41 and two support insulator holes (not shown). One power feeding screw hole 41 and two support insulator holes 42 are formed at substantially equal intervals (approximately 120 degree intervals) in the circumferential direction of the first support cylinder 39 and the second support cylinder 40, respectively. Has been done. The diameter (outer diameter) of the first support cylinder 39 is set to be smaller than the outer cylinder 10 and larger than the middle cylinder 11, and the gap between the outer cylinder 10 and the middle cylinder 11 is set to 2 It is arranged at an equally divided position (L1 = L2). The diameter (outer diameter) of the second support cylinder 40 is set to be smaller than the middle cylinder 11 and larger than the inner cylinder 12, and the gap between the middle cylinder 11 and the inner cylinder 12 is set to 2 It is arranged at an equally divided position (L3 = L4).

The discharge electrode 38 includes a first discharge electrode 43 supported by the first support cylinder 39 and a second discharge electrode 44 supported by the second support cylinder 40. .. Each base end portion of the first discharge electrode 43 and the second discharge electrode 44 is sandwiched and crimped between the outer cylinder and the inner cylinder in the support cylinders 39 and 40, respectively. ing. The first discharge electrode 43 and the second discharge electrode 44 are supported in a state of extending from each of the support cylinders 39 and 40 toward both the upper and lower sides (upstream side and downstream side in the air flow direction), respectively. Has been done.

The discharge electrodes 43 and 44 are all formed to have substantially the same overall length, and their tips are substantially aligned. The protruding length of each of the discharge electrodes 43 and 44 (the length from the upper end or the lower end of each of the support cylinders 39 and 40 to the tip of each discharge electrode) is set to several mm. The discharge electrodes 43 and 44 are arranged so as to be in phase with each other above and below the support cylinders 39 and 40. That is, the pair of discharge electrodes 43, 44 facing each other with the support cylinders 39, 40 interposed therebetween are provided on a straight line extending in the vertical direction. The discharge electrodes 43 and 44 may be arranged in a staggered manner above and below the support cylinders 39 and 40.

The first discharge electrode 43 is provided at a position that bisects the gap between the outer cylinder 10 and the inner cylinder 11, and the second discharge electrode 44 is the middle cylinder 11 and the inner cylinder 11. It is provided at a position that divides the gap between 12 and 12 into two equal parts (L1 = L2 = L3 = L4 in FIG. 5). As a result, it is possible to prevent only a part of the plurality of discharge electrodes 43 and 44 from being extremely deteriorated, and it is possible to generate a stable corona discharge over the entire circumferential direction.

Each of the discharge electrodes 43 and 44 is composed of a wire electrode bundle in which a plurality of fibrous wire electrodes are bundled, and the wire electrode bundle is formed in a brush shape. The wire electrodes constituting the discharge electrodes 43 and 44 are made of stainless steel fibers having a diameter of 12 μm. The first discharge electrode 43 is formed by bundling about 100 wire electrodes at intervals of about several tens of mm along the circumferential direction of the first support cylinder 39. The second discharge electrode 44 is formed by bundling about 100 wire electrodes at intervals of about several mm along the circumferential direction of the second support cylinder 40. That is, the distance P2 between the wire electrode bundles of the second discharge electrode 44 (see FIG. 3) is set smaller than the distance P1 (see FIG. 3) between the wire electrode bundles of the first discharge electrode 43. There is.

The high voltage applied to the first discharge electrode 43 and the second discharge electrode 44 is set to be the same (for example, several KV), and the distances L1, L2 between each discharge electrode 43, 44 and each ground electrode are set. L3 and L4 are all set to the same distance (L1 = L2 = L3 = L4 in FIG. 5) and an appropriate distance at which abnormal discharge does not occur (about 10 to 20 mm).

In this case, the flow velocity of the air passing through the gap between the inner cylinder 11 and the inner cylinder 12 is faster than the flow velocity of the air passing through the gap between the outer cylinder 10 and the middle cylinder 11 (middle cylinder). Since the cross-sectional area of the gap between the body 11 and the inner cylinder 12 is smaller than the cross-sectional area of the gap between the outer cylinder 10 and the inner cylinder 11, wind velocity V = air volume Q / cross-sectional area A causes the air volume Q. When is constant, the flow velocity of air passing through the gap between the inner cylinder 11 and the inner cylinder 12 is faster). Therefore, by making the distance P2 between the wire electrode bundles of the second discharge electrode 44 smaller than the distance P1 between the wire electrode bundles of the first discharge electrode 43, the wire electrode of the second discharge electrode 44 The number of bundles installed is large and they are arranged at high density. As a result, particles in the air that could not be collected by the first discharge electrode 43 can be collected by the second discharge electrode 44, and the collection efficiency of the particles in the air can be improved. Can be done.

Further, the power supplied to the first discharge electrode 43 and the second discharge electrode 44 is the same, and the power applied per bundle of wire electrodes of the first discharge electrode 43 is the second discharge electrode 44. It is set to be larger than the electric power applied per bundle of wire electrodes. Therefore, in the first discharge electrode 43, by increasing the electric field force per bundle of wire electrodes, as many particles as possible can be charged and collected.

The high voltage applied to the first discharge electrode 43 and the second discharge electrode 44 is set to different voltages, and the distances between the discharge electrodes 43 and 44 and the ground electrodes L1, L2, L3, L4. May be set to different distances.
<Insulator for power supply>

The power feeding insulator 14 is made of, for example, porcelain, pottery, or resin having excellent electrical insulation. The power feeding insulator 14 includes an insulator body 45 having a rectangular plate shape, and a first body portion 46 and a second body portion 47 extending inward from the insulator body 45.

Screw holes 48 are formed at the upper and lower ends of the insulator body 45, respectively, and the insulator body 45 is fixed to the peripheral wall 17 of the outer cylinder 10 by the screws 49 and the nuts 50 screwed into the screw holes 48. A recess 51 is formed in the central portion of the outer surface of the insulator main body 45. A first screw hole 52 is formed in the recess 51 and the first body 46, and a second screw hole 53 is formed in the recess 51 and the second body 47. Further, convex portions 54 for positioning the feeding plate are formed at two locations on the outer surface of the concave portion 51.

On the flat surface of the recess 51, a first feeding plate 55 and a second feeding plate 56 are provided as a feeding connection portion made of stainless steel which is hard to rust and has conductivity. The first feeding plate 55 is formed in an inverted L shape, and the second feeding plate 56 is formed in an L shape. A first feeding hole 57 (see FIG. 5) is formed at the upper end of the first feeding plate 55, and a second feeding hole 58 (see FIG. 5) is formed at the lower end of the second feeding plate 56. Has been done. Further, positioning holes 59 and 60 are provided in the central portions of the first feeding plate 55 and the second feeding plate 56, respectively, and the convex portions 54 of the insulator main body 45 are provided in these positioning holes 59 and 60, respectively. Is fitted so that the first feeding plate 55 and the second feeding plate 56 are positioned at predetermined positions. Since the first power supply plate 55 and the second power supply plate 56 are arranged on the same flat surface of the recess 51, power can be supplied to two places from the same direction, and the power supply mechanism can be simplified. ..

The first body portion 46 and the second body portion 47 each penetrate the power feeding hole 19 of the outer cylinder 10. The second body portion 47 is arranged below the first body portion 46 at a predetermined distance so as not to interfere with the first discharge electrode 43.

The first power feeding screw 61 as the first power feeding member having conductivity is screwed into the first screw hole 52 through the power feeding screw hole 41 of the first support cylinder 39, and the first power feeding is performed. The first support cylinder 39 is supported and the first power supply plate 55 is fixed by screwing the first nut 62 into the tip of the first power supply screw 61 through the hole 57. To. As a result, the first feeding plate 55 and the first support cylinder 39 are made conductive via the first feeding screw 61.

Similarly, the second power feeding screw 63 as the second power feeding member having conductivity is screwed into the second screw hole 53 through the power feeding screw hole 41 of the second support cylinder 40, and the second screw hole 53 is inserted. By penetrating the feeding hole 58 of 2 and screwing the second nut 64 into the tip of the second feeding screw 63, the second support cylinder 40 is supported and the second feeding plate 56 is supported. Is fixed. As a result, the second feeding plate 56 and the second support cylinder 40 are made conductive via the second feeding screw 63. By providing the first power feeding screw 61 and the second power feeding screw 63 on the same power feeding insulator 14 in this way, power can be supplied from the same power feeding direction at two locations, so that the power feeding mechanism is simplified. Can be transformed into.

The first body portion 46 and the second body portion 47 have a substantially cylindrical shape, and the outer peripheral surface thereof is formed to be uneven. As a result, the creepage distance can be extended and the insulating property can be improved, so that creepage discharge is less likely to occur. The first body portion 46 and the second body portion 47 extend from the apex on the circumference of the outer cylinder 10 so that the root portions of the body portions 46 and 47 overlap each other in a plan view.

A predetermined high voltage is applied from the high voltage power supply unit 16 to the first power supply plate 55 and the second power supply plate 56, respectively, via the first power supply contact member 21 and the second power supply contact member 22. The first feeding contact member 21 and the second feeding contact member 22 are provided with a spring material that can be contacted and separated from the first feeding plate 55 and the second feeding plate 56, respectively. For example, the power supply contact members 21 and 22 are attached to the storage frame 100, and when the electrostatic precipitator 1 is attached to the storage frame 100, they come into contact with the first power supply plate 55 and the second power supply plate 56, while collecting electricity. When the dust device 1 is removed from the accommodating frame 100, it is configured to be separated from the first feeding plate 55 and the second feeding plate 56.
<Support insulator>

The support insulator 15 includes two first support insulators 66 and two second support insulators 67. The supporting insulators 66 and 67 are made of porcelain, ceramics, or a resin having excellent electrical insulation, respectively. The first support insulator 66 is supported between the outer cylinder 10 and the first support cylinder 39, and the second support insulator 67 is supported by the inner cylinder 12 and the second support cylinder 40. Is supported during. Each of the support insulators 66 and 67 is provided at substantially equal intervals in the circumferential direction (a total of two insulators at intervals of approximately 120 degrees).
<High voltage power supply unit>

As shown in FIG. 1, the high voltage power supply unit 16 includes a first high voltage power supply unit 68 and a second high voltage power supply unit 69. Each of the high voltage power supply units 68 and 69 includes an output power supply 70, a high voltage transformer 71, and a booster unit 72, which are the same. The first high voltage power supply unit 68 applies a high voltage between the first discharge electrode 43 and the outer cylinder 10 and the middle cylinder 11, and the second high voltage power supply unit 69 is the second. A high voltage is applied between the discharge electrode 44 and the middle cylinder 11 and the inner cylinder 12. Each of the high-voltage power supply units 68 and 69 boosts the voltage of the AC original power supply P (for example, 100V) with the high-voltage transformer 71, then converts the AC current into direct current with the booster 72, and further boosts the voltage to about minus about minus. Generates a high voltage of several KV. Further, each of the high voltage power supply units 68 and 69 also functions as an output control unit that controls the output of the high voltage applied to the electrostatic precipitator 1. The limit switch 73 is in the turned-on state (ON state) when the electrostatic precipitator 1 is attached to the accommodating frame 100, and is in the open state (OFF state) when the electrostatic precipitator 1 is detached from the accommodating frame 100.

If the high-voltage power supply unit 16 is composed of one high-voltage power supply unit, for example, when the first discharge electrode 43 is short-circuited due to the adhesion of dust or dirt, the first discharge electrode 44 is first with respect to the second discharge electrode 44. The electric power to be supplied to the discharge electrode 43 of the above is also applied (double the electric power is supplied to the first discharge electrode 43). As a result, there is a possibility that abnormal discharge may occur and stable discharge may not be performed, so that there is a problem that safety is lowered. On the other hand, as in the present embodiment described above, the high voltage power supply unit 16 is composed of the first high voltage power supply unit 68 and the second high voltage power supply unit 69, which are tentatively one of them. Even if a short circuit occurs in the discharge electrode, it does not affect the other discharge electrode, so that safety can be ensured.

Further, if the dust collection method is a positive charge method, the discharge distance must be shortened in order to secure the discharge current required for charging, and abnormal discharge is likely to occur. Therefore, in the above-described embodiment, the negative charge method is adopted in consideration of the large discharge current even at the same space interval (gap) and the discharge stability (tendency to prevent abnormal discharge).

In the above-described embodiment, the high voltage applied to the first discharge electrode 43 and the second discharge electrode 44 is the same minus number KV, but the high voltage applied to the first discharge electrode 43. The voltage and the high voltage applied to the second discharge electrode 44 may be set to different high voltages. In that case, depending on the high voltage applied to the first discharge electrode 43 and the second discharge electrode 44, the gap between the outer cylinder 10 and the middle cylinder 11 or the inside of the middle cylinder 11 A gap between the cylinder 12 and the cylinder 12 is set. Further, a direct current source power source (for example, 24 KV) may be used.
<Air flow path>

As shown in FIG. 5, air flow paths 74 are formed on the outside and the inside of the electrostatic precipitator 1. The air flow path 74 is formed with a first flow path 75, a second flow path 76, and a third flow path 77 in this order from the upstream side to the downstream side in the air flow direction.

The first flow path 75 is formed in the vertical direction between the inner peripheral surface of the outer cylinder 10 and the outer peripheral surface of the inner cylinder 11. In the first flow path 75, air flows from above to below. The second flow path 76 is formed in the vertical direction between the inner peripheral surface of the inner cylinder 11 and the outer peripheral surface of the inner cylinder 12. In the second flow path 76, the air inverted at the lower end (downstream end) of the first flow path 75 flows from the lower side to the upper side. The third flow path 77 is formed in the vertical direction inside the inner cylinder 11. In the third flow path 77, the air inverted at the upper end (downstream end) of the second flow path 76 flows from the upper side to the lower side. The downstream end of the third flow path 77 is connected to the upstream end of the exhaust duct 101.

As described above, the air flow path 74 reverses the air flow direction twice at the lower end (downstream end) of the first flow path 75 and the upper end (downstream end) of the second flow path 76. It is formed in a substantially S shape.
[Action of electrostatic precipitator]

Next, the operation of the electrostatic precipitator 1 will be described mainly with reference to FIG.
Air containing particles such as oil smoke generated from foodstuffs baked in the cooker (for example, several m ³ / min) is sucked into the storage frame 100 from the suction port of the cooker by the suction force of the suction fan, and is electrostatically collected. It flows toward the device 1. The air containing the particles collides with the end face portion 26 of the upper middle cylinder 24 provided on the upstream side in the flow direction and is slightly decelerated while flowing into the first flow path 75. At this time, a part of the relatively large particles is separated from the air and stored in the recess 27 of the end face portion 26. The end face portion 26 of the upper middle cylinder 24 may be formed so as to be inclined toward the recess 27 so that the particles separated by the collision of air easily face the recess 27.

The air containing the particles that have flowed into the first flow path 75 flows from above to below along the first flow path 75, and flows between the outer cylinder 10 and the first support cylinder 39. The air flowing between the middle cylinder 11 and the first support cylinder 39 is separated into, and then merges at the lower part.

At this time, the first high voltage power supply unit 68 applies a high voltage between the first discharge electrode 43 arranged in the upper part of the first flow path 75 and the cylinders 10 and 11. Then, a corona discharge (negative corona) is generated by the electric field generated around the first discharge electrode 43, and the corona discharge is performed on the tip of the first discharge electrode 43, the outer cylinder 10, and the middle cylinder. A substantially conical charged area EA is formed between the battery and the product 11. This corona discharge charges particles in the air flowing through the first flow path 75 (charged area EA), and the charged particles are the inner peripheral surface of the outer cylinder 10 and the outer peripheral surface of the inner cylinder 11 which are ground electrodes. It is attracted to, adsorbed, and collected.

Next, the air containing the particles flows to the downstream end of the first flow path 75, then its flow direction is reversed (U-turn), and the second flow path passes through the opening 29 of the lower middle cylinder 25. It flows into 76. At this time, since the air containing the particles is suddenly changed course from the first flow path 75 to the second flow path 76, the particles in the air are separated from the air by centrifugal force or the like. At that time, a part of the separated particles is stored in the outer flange portion 28 of the lower middle cylinder body 25 and the overhanging portion 32 of the inner cylinder body 12.

The air containing the particles flowing into the second flow path 76 flows from the lower side to the upper side along the second flow path 76, and flows between the middle cylinder 11 and the second support cylinder 40. The air flowing between the inner cylinder 12 and the second support cylinder 40 is separated into, and then merges at the upper part.

At this time, the second high voltage power supply unit 69 applies a high voltage between the second discharge electrode 44 arranged in the intermediate portion of the second flow path 76 and the cylinders 11 and 12. Then, a corona discharge (negative corona) is generated by the electric field generated around the second discharge electrode 44, and the corona discharge is performed on the tip of the second discharge electrode 44, the middle cylinder 11, and the inner cylinder. A substantially conical charging area EA is formed between the battery and the battery. This corona discharge charges particles in the air flowing through the second flow path 76 (charged area EA), and the charged particles are the inner peripheral surface of the inner cylinder 11 which is the ground electrode and the outer peripheral surface of the inner cylinder 12. Alternatively, it is attracted to the vicinity of the upper corner portion of the upper middle cylinder 24 or the inner surface (lower surface) of the end surface portion 26, is attracted, and is collected.

Next, the air from which the particles are separated flows to the upper end (downstream end) of the second flow path 76, then its flow direction is reversed (U-turn) and flows into the third flow path 77. The air flows from above to below along the third flow path 77 and flows into the exhaust duct 101. The charged particles may also be adsorbed on the inner peripheral surface of the inner cylinder 12.

As a result, the air from which the particles have been removed is exhausted to the outside through the exhaust duct 101. The particles collected in the recess 27, the outer flange portion 28, and the overhanging portion 32 are periodically collected and removed. Further, the particles collected in the cylinders 10, 11 and 12 are removed during the periodic maintenance of the electrostatic precipitator 1. Specifically, the particles collected in each of the cylinders 10, 11 and 12 are subjected to ultrasonic cleaning or the like using an alkaline detergent on the electrostatic precipitator 1 taken out from the accommodating frame 100. Will be removed.
<Mode switching function>

The electrostatic collector 1 has a first mode in which a high voltage is applied only to the first discharge electrode 43 and a second mode in which a high voltage is applied only to the second discharge electrode 44 according to preset conditions. Mode and a control unit (not shown) that controls switching to any of the modes of the third mode in which a high voltage is applied to the first discharge electrode 43 and the second discharge electrode 44. May be good.

In this case, a sensor (shown) such as a smoke sensor or a photoelectric sensor that measures the amount of oil smoke generated in the flow path between the source of oil smoke or the like and the electrostatic precipitator 1 or the suction port of the electrostatic precipitator 1. Smoke) is provided. The control unit includes an operating time measuring unit (not shown) that measures the operating time, an oil smoke generation amount storage unit (not shown) that stores the measured value from the sensor that measures the amount of oil smoke generated, and the like. It will be provided. Then, the control unit switches the mode when the preset conditions (cooking time, amount of oil smoke generated) are exceeded. For example, until the set condition is exceeded, the first mode or the second mode is selected and operated, and when the set condition is exceeded, the process shifts to the third mode and operates. Further, the mode may be switched according to the cooking menu and the cumulative cooking time.

By providing the mode switching function in this way, it is possible to properly use the mode suitable for the application according to the preset conditions, so that the electrostatic precipitator 1 can be operated efficiently.
[effect]

According to the electrostatic precipitator 1 according to the embodiment of the present invention described above, the discharge electrodes 43, 44 are formed in the gap between the outer cylinder 10 and the middle cylinder 11 and the gap between the middle cylinder 11 and the inner cylinder 12. By arranging the above, it is possible to realize miniaturization (compactness) of the device while providing a plurality of discharge electrodes 43 and 44, and to improve the dust collection efficiency while making particles such as high-concentration dust and mist. Can also be handled.

Further, by forming the air flow path 74 in an S shape, the inner peripheral surface of the outer cylinder 10, the outer peripheral surface and the inner peripheral surface of the middle cylinder 11, and the outer peripheral surface and the inner peripheral surface of the inner cylinder 12 are formed. Since the area for adsorbing and collecting charged particles (collection area) can be expanded, the amount of particles collected can be increased while the device can be downsized.

Further, by setting the high voltage applied to the first and second discharge electrodes 43 and 44 to be the same, the same high voltage power supply units 68 and 69 can be used, and the economic efficiency can be improved. ..

Further, by feeding power from one feeding insulator 14 to the first and second discharging electrodes 43 and 44, the feeding insulator 14 can be shared, so that the economy can be improved. In addition, since power can be supplied to two locations from the same direction without affecting the discharge performance, the power supply mechanism can be simplified.

Further, the wire electrode bundles of the first and second discharge electrodes 43 and 44 extend from the first and second support cylinders 39 and 40 toward the upstream side and the downstream side in the air flow direction, respectively. There is. Therefore, it is possible to discharge at a relatively low voltage, prevent the occurrence of a fire, and improve safety. Further, since the number of discharge points can be increased, the fine particles in the air flow can be reliably charged.

Further, by setting the power applied to one bundle of wire electrodes of the second discharge electrode 44 to be smaller than the power applied to one bundle of wire electrodes of the first discharge electrode 43, the bundle of wire electrodes is set. The effect of electric field interference between them can be reduced. Further, the distance between the wire electrode bundles of the second discharge electrode 44 is set smaller than the distance between the wire electrode bundles of the first discharge electrode 43, and the wire electrode bundle of the second discharge electrode 44 is raised. By arranging the particles at a high density, the particles that could not be collected by the first discharge electrode 43 can be reliably collected.

Further, by independently providing the first high voltage power supply unit 68 and the second high voltage power supply unit 69, even if one discharge electrode is short-circuited due to dust or dirt, the other discharge electrode is provided. There is no risk of excessive power being supplied to the power. Therefore, it is possible to avoid the stoppage and failure of the device due to the frequent occurrence of abnormal discharge, and to ensure the safety.
[Electrostatic precipitator according to the second embodiment]

The electrostatic precipitator 80 according to the second embodiment of the present invention will be described with reference to FIGS. 6 and 7. FIG. 6 is a perspective view showing the electrostatic precipitator 80 from diagonally above, and FIG. 7 is an enlarged cross-sectional view showing a part of the electrostatic precipitator 80. In the description of the electrostatic precipitator 80 according to the present embodiment, the same configuration as the electrostatic precipitator 1 according to the first embodiment described above is the same as FIGS. 1 to 5 in FIGS. 6 and 7. The reference numeral is given and detailed description thereof will be omitted.

The electrostatic precipitator 80 according to the present embodiment includes a lid 81 that covers the upper end surface of the outer cylinder 10. The lid 81 is configured to include a disk-shaped top plate 82 and a peripheral wall 83 extending downward from the outer edge portion of the top plate 82.

A plurality of (for example, 16) openings 85 are formed in a circumferential shape on the outer peripheral portion of the top plate 82, and a metal mesh 86 as a pretreatment portion formed in a mesh shape is formed in each opening 85. Is fixed from the lower surface side of the top plate 82. The mesh 86 may be a single annular mesh or may be divided into a plurality of (for example, 16) meshes. The size of the mesh of the mesh 86 is appropriately set according to the intended use, and the mesh 86 can prevent the intrusion of relatively large foreign matter. In FIG. 6, for convenience, the mesh 86 is shown only for one opening 85, and the mesh 86 is omitted for the other openings 85.

In the present embodiment, the outer cylinder 10 and the inner cylinder 12 are integrally formed. The middle cylinder 11 is formed in a substantially cylindrical shape in which the upper end surface (one end surface) and the lower end surface (end end surface) are open. The same configuration as the end face portion 26 and the recess 27 of the upper middle cylinder 24 in the first embodiment described above is formed in a portion closer to the center than the opening 85 of the top plate 82 of the lid 81. The upper end of the middle cylinder 11 extends to a height in contact with the lid 80. The outer flange portion 28 of the middle cylinder 11 is fixed to the outer cylinder 10 by a screw.

The peripheral wall 83 of the lid 81 is formed so as to be removable from the outer side of the upper end portion of the peripheral wall 17 of the outer cylinder 10. Thereby, if the lid 83 is removed, the internal state of the electrostatic precipitator 80 can be confirmed. Since the operations of the air flow path 74 and the electrostatic precipitator 80 are the same as those of the electrostatic precipitator 1 according to the first embodiment described above, detailed description thereof will be omitted here.
[Electrostatic precipitator according to the third embodiment]

The electrostatic precipitator 90 according to the third embodiment of the present invention will be described with reference to FIG. FIG. 8 is an enlarged cross-sectional view showing a part of the electrostatic precipitator 90. In the description of the electrostatic precipitator 90 according to the present embodiment, the same reference numerals as those in FIGS. 1 to 5 are used in FIG. 8 for the same configuration as the electrostatic precipitator 1 according to the first embodiment described above. A detailed description will be omitted.

The electrostatic precipitator 90 according to the present embodiment has one high voltage power supply unit (not shown) and one power supply contact member 91 via one power supply plate 92 and one power supply screw 93. , The first discharge electrode 43 and the second discharge electrode 44 are provided with the same high voltage.

The power feeding porcelain 94 has a porcelain body 45 fixed to the peripheral wall 17 of the outer cylinder 10 by screws 49 and a nut 50, and a first support cylinder 39 that penetrates the outer cylinder 10 and extends to the first support cylinder 39. It includes a body portion 95 and a second body portion 96 that penetrates the lower middle cylinder body 25 and is provided between the first support cylinder body 39 and the second support cylinder body 40.

A feeding screw 93 as a conductive feeding member is screwed into the screw hole of the first body portion 95 and the screw hole of the second body portion 96, and the first is inserted in the middle portion of the feeding screw 93. By screwing the nut 97 and screwing the second nut 98 into the tip of the power feeding screw 93, the first support cylinder 39 and the second support cylinder 40 are supported and the power feeding plate 92. Is fixed. The first nut 97 is housed inside the second body 96, and the feeding plate 92 and the first support cylinder 39 and the second support cylinder 40 are conducted with each other via the feeding screw 93. .. Further, the first support cylinder 39 is arranged in the center of the first flow path 75 formed in the gap between the outer cylinder 10 and the middle cylinder 11, and the second support cylinder 40 is in the middle. It is arranged in the center of the second flow path 76 formed by the gap between the tubular body 11 and the inner tubular body 12. Since the operations of the air flow path 74 and the electrostatic precipitator 90 are the same as those of the electrostatic precipitator 1 according to the first embodiment described above, detailed description thereof will be omitted here.

As described above, according to the electrostatic precipitator 90 according to the embodiment of the present invention described above, one power feeding member (power feeding screw 93) together with the first discharge electrode 43 (first support cylinder 39). Since a high voltage can be applied to the second discharge electrode 44 (second support cylinder 40), the number of parts can be reduced and the economic efficiency can be improved.

In the electrostatic precipitator 1 according to each of the above-described embodiments, the air flow path 74 is formed in an S shape, but the present invention is not limited thereto. For example, a linear air flow path in which both ends of the outer cylinder body 10, the middle cylinder body 11, and the inner cylinder body 12 are open, or a U-shaped air flow path may be used.

Further, in the electrostatic precipitator 1 according to each of the above-described embodiments, the outer cylinder 10, the middle cylinder 11, the inner cylinder 12, and the support cylinders 39 and 40 are formed in a cylindrical shape, respectively. , The present invention is not limited to this. For example, the outer cylinder 10, the middle cylinder 11, the inner cylinder 12, and the support cylinders 39, 40 may be formed in a cylindrical shape having an elliptical cross section, or a polygon such as a triangle or a quadrangle. It may be formed in the shape of a square cylinder having a cross section. Further, the outer cylinder 10, the middle cylinder 11, the inner cylinder 12, and the support cylinders 39, 40 are not limited to stainless steel, and may be made of a metal such as iron, copper, or an aluminum alloy.

Furthermore, the description of each of the above-described embodiments shows one aspect of the electrostatic precipitator according to the present invention, and the technical scope of the present invention is not limited to the above-described embodiments.

The technique of the present invention can be used for a smokeless roaster or the like that sucks and collects oily smoke generated during cooking. It can also be used as an air purifier or the like that collects particles such as pollen and cigarette smoke in the air indoors. Furthermore, it can also be used for an air supply duct device that takes in the air from which dust (particles) has been removed from the outdoor air into the room, and an exhaust duct device that exhausts the air from which dust (particles) has been removed from the indoor air to the outside. can. Further, it can also be used for an oil smoke removing device that sucks and collects locally generated oil smoke and oil mist, and oil smoke and oil mist diffused and suspended in the air.

1 Electrostatic collector 10 Outer cylinder 11 Inner cylinder 12 Inner cylinder 14 Power supply porcelain 39 First support cylinder 40 Second support cylinder 43 First discharge electrode 44 Second discharge electrode 46 1st body 47 2nd body 55 1st power supply plate 56 2nd power supply plate 61 1st power supply screw (1st power supply member)
63 Second power supply screw (second power supply member)
68 First high-voltage power supply unit 69 Second high-voltage power supply unit 74 Air flow path 80 Electrostatic precipitator 90 Electrostatic precipitator 93 Power supply screw (power supply member)

Claims (11)

It is an electrostatic precipitator that charges and collects particles in the air by the corona discharge generated by the application of high voltage.
An outer cylinder formed as a tubular ground electrode, and
An inner cylinder formed as a tubular ground electrode inside the outer cylinder and provided with a gap between the outer cylinder and the inner cylinder.
An inner cylinder formed as a tubular ground electrode inside the middle cylinder and provided with a gap between the middle cylinder and the inner cylinder.
A plurality of first supports supported by a first support cylinder provided in a state of being electrically insulated from the outer cylinder and the middle cylinder in a gap between the outer cylinder and the middle cylinder. Discharge electrode and
A plurality of second supports supported by a second support cylinder provided in a state of being electrically insulated from the middle cylinder and the inner cylinder in the gap between the middle cylinder and the inner cylinder. Discharge electrode and
A power feeding member that applies a high voltage to the first discharge electrode via the first support cylinder and applies a high voltage to the second discharge electrode via the second support cylinder. When,
Equipped with
The power feeding member
A first power feeding member that applies a high voltage to the first discharging electrode, and
A second power feeding member that applies a high voltage to the second discharging electrode, and
Equipped with
The power supply insulator that protects the power supply member is
A first body portion that supports the first power feeding member in an electrically insulated state, and
A second body that supports the second power feeding member in an electrically insulated state, and
Equipped with
The first body portion is connected to the first support cylinder so as to penetrate the outer cylinder and block the gap between the outer cylinder and the middle cylinder.
The second body portion penetrates the outer cylinder body to block the gap between the outer cylinder body and the middle cylinder body, and also penetrates the middle cylinder body to penetrate the middle cylinder body and the inner cylinder. An electrostatic precipitator characterized in that it is connected to the second support cylinder so as to block a gap between the body and the body . One end surface of the outer cylinder is open,
One end surface of the middle cylinder body is closed and the other end surface is opened.
Both ends of the inner cylinder are open, and the inner cylinder is open.
The other end of the outer cylinder and the other end of the inner cylinder are closed.
Air flows from the one end surface of the outer cylinder into the gap between the outer cylinder and the inner cylinder, flows toward the other end, and then reverses and reverses to form the inner cylinder and the inner cylinder. The electricity according to claim 1, wherein an air flow path that flows into the gap between the inner cylinder and flows toward the one end surface of the inner cylinder and is further inverted and flows into the inside of the inner cylinder is formed. Dust collector. The electrostatic precipitator according to claim 2, wherein one end surface is an upper end surface and the other end surface is a lower end surface. The gap between the first discharge electrode and the outer cylinder, the gap between the first discharge electrode and the middle cylinder, the second discharge electrode and the middle cylinder. The electricity according to any one of claims 1 to 3, wherein the gap between the two and the gap between the second discharge electrode and the inner cylinder has the same radial length. Dust collector. The second body portion according to any one of claims 1 to 4, wherein the second body portion is arranged apart from the first body portion and the downstream side in the air flow direction from the first discharge electrode. The electrostatic precipitator described. A first power supply plate connected to the first power supply member,
A second power supply plate connected to the second power supply member,
Equipped with
The electrostatic precipitator according to any one of claims 1 to 5, wherein the first power supply plate and the second power supply plate are arranged apart from each other on the same surface of the power supply insulator. The power feeding member penetrates the outer cylinder body and the middle cylinder body, and has a gap between the outer cylinder body and the middle cylinder body and a gap between the middle cylinder body and the inner cylinder body. The electrostatic dust collector according to any one of claims 1 to 6 , which is arranged so as to block the above and is connected to the first support cylinder and the second support cylinder. The first discharge electrode and the second discharge electrode are composed of a wire electrode bundle in which a plurality of fibrous wire electrodes are bundled, and the wire electrode bundle includes the first support cylinder and the second. The electrostatic precipitator according to any one of claims 1 to 7 , which extends from the support cylinder of the above toward the upstream side and the downstream side in the air flow direction, respectively. The power applied to one bundle of wire electrodes of the second discharge electrode is set to be smaller than the power applied to one bundle of wire electrodes of the first discharge electrode, and the second discharge electrode is set. The electrostatic dust collector according to claim 8 , wherein the distance between the wire electrode bundles of the first discharge electrode is set smaller than the distance between the wire electrode bundles of the first discharge electrode. A first high voltage power supply unit that supplies a high voltage to the first discharge electrode and a second high voltage power supply unit that supplies a high voltage to the second discharge electrode are independently provided. The electric dust collector according to any one of claims 1 to 6 . A first mode in which a high voltage is applied only to the first discharge electrode, a second mode in which a high voltage is applied only to the second discharge electrode, and the first mode according to preset conditions. 10. The electrostatic dust collector according to claim 10 , further comprising a control unit that controls switching to any of the discharge electrodes and the third mode in which a high voltage is applied to the second discharge electrode.

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