JP2012157831A - Brush unit and moving electrode type electrostatic precipitator - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a brush unit for use in moving electrode type electrostatic precipitators which is capable of increasing the life of the brush wires; and to provide a moving electrode type electrostatic precipitator.SOLUTION: A brush unit 50 is provided with a rib 52 disposed in the longitudinal direction of the outer circumferential surface of a shaft 51, a channel brush 60 comprising brush wires 62 implanted in a band-shape body 63, fasteners 54 which together with the rib 52 hold the band-shape body 63, and bolts 57 and nuts 56 which detachably fasten the rib 52 and the fasteners 54 in a state in which the band-shape body 63 is sandwiched between the rib 52 and the fasteners 54.

Description

  The present invention relates to a brush unit and a moving electrode type electrostatic precipitator of a moving electrode type electrostatic precipitator that contacts the surface of a dust collecting electrode plate and scrapes off dust.

  Conventionally, a moving electrode type electrostatic precipitator or the like is used as a device for removing dust such as soot from combustion exhaust gas in a thermal power plant or the like. In this moving electrode type electrostatic precipitator, a dust collecting electrode is composed of a plurality of dust collecting electrode plates, and these dust collecting electrode plates are connected by a chain so as to form a loop, and these dust collecting electrode plates are circulated. At the same time, dust collected on the surface through a pair of brush units arranged in the middle of the peripheral circuit is scraped off by the brush. This brush unit is formed by bundling a large number of brush strands between long strips and connecting the strips to a rotating shaft. Conventionally, as a method of connecting the strip and the rotating shaft, a method of directly welding the strip to the rotating shaft, or connecting the strip to the rib provided on the rotating shaft after welding the strip to the flat plate is adopted. (For example, refer to cited document 1).

JP-A-9-313253

  As described above, welding is used to connect the strip and the rotating shaft, but the brush element wire is made of a metal such as stainless steel having a thickness of 0.5 mm or less, so when the strip is welded. There has been a problem that the brush strands are deteriorated due to heat damage due to welding heat, and the brush strands are liable to be broken and the life is shortened.

  The present invention has been made to solve the above-described problems, and provides a brush unit for a moving electrode type electrostatic precipitator and a moving electrode type electrostatic precipitator that can extend the life of a brush element wire. The purpose is to provide.

  In order to achieve the above object, a brush unit for a moving electrode type electrostatic precipitator according to the present invention has a rib provided in the longitudinal direction of the outer peripheral surface of a shaft and a plurality of brush strands sandwiched between strips. In a state where the brush, the belt-like body is sandwiched between the ribs, and the belt-like body is sandwiched between the ribs and the fixture, the rib and the fastener are detachably fastened. And fastening means.

According to the present invention, since the strip and the fixture are detachably fastened by the fastening means in a state where the belt-like body is sandwiched between the rib and the fixture, the brush element wire may be thermally damaged by welding or the like. Since there is not, the lifetime of a brush strand can be lengthened.
In the above invention, the fixture is provided with a notch, and the band-like body is engaged with the notch of the fixture.

According to this invention, it can fix between a rib and a fixing tool so that a strip | belt-shaped body may not move.
In the above invention, an end of the belt-like body on the side where the plurality of brush strands are disposed is exposed to the outside from the edge of the rib and the fixture.

  According to the present invention, the brush strand does not contact the rib or the fixture. Accordingly, since the brush strand is not greatly bent at the contact portion, the bending stress applied to the brush strand can be reduced, and the life of the brush strand can be extended.

  The present invention also provides a moving electrode type electrostatic precipitator equipped with the brush unit. ADVANTAGE OF THE INVENTION According to this invention, since the lifetime of a brush strand can be lengthened and the replacement frequency of a brush can be reduced, a working electrode type electric dust collector with a high operation rate and economical efficiency can be provided. .

  According to the present invention, since the strip and the fixture are detachably fastened by the fastening means in a state where the belt-like body is sandwiched between the rib and the fixture, the brush element wire may be thermally damaged by welding or the like. Since there is not, the lifetime of a brush strand can be lengthened.

It is a perspective development view of a brush unit according to an embodiment of the present invention. It is a perspective view of a channel brush. It is a side view of the brush unit which concerns on the same embodiment. It is sectional drawing of the brush unit which concerns on the same embodiment. It is a figure which shows a pair of brush unit arrange | positioned in the position which pinches | interposes both surfaces of the dust collection electrode plate of a moving electrode type electrostatic dust collector. It is a perspective view of one moving electrode for demonstrating the structure of a moving electrode. It is an arrangement plan of the lower part of a plurality of movement electrodes with which a movement electrode type electric dust collector is provided.

Next, an embodiment for carrying out the invention when the brush unit according to the present invention is applied to a moving electrode type electrostatic precipitator will be described in detail with reference to the drawings.
The moving electrode type electrostatic precipitator includes a plurality of moving electrodes that electrostatically collect dust.

  FIG. 6 is a perspective view of one moving electrode 15 for explaining the configuration of the moving electrode. As shown in FIG. 6, the moving electrode 15 has a drive wheel 26 disposed at the top and a roller 28 disposed at the bottom. A pair of endless chains 30 are stretched between the drive wheel 26 and the roller 28. A plurality of dust collecting electrode plates 32 are suspended between the pair of endless chains 30 to form a loop as the entire moving electrode 15. The shaft 34 of the drive wheel 26 is rotated by a drive mechanism (not shown), and this rotation is transmitted to the endless chain 30 that meshes with the drive wheel 26 so that the endless chain 30 circulates. In conjunction with this, a plurality of dust collecting electrode plates 32 suspended from the endless chain 30 circulates.

  FIG. 7 is a layout view below the plurality of moving electrodes 15 provided in the moving electrode type electrostatic precipitator. The plurality of moving electrodes 15 are arranged in parallel, and a loop is formed so as to circulate every other discharge electrode 14. Each dust collecting electrode plate 32 suspended from the endless chain 30 and lowered due to the rotation turns upward at the position of the roller 28. A pair of brush units 50 are arranged at positions sandwiching both surfaces of the dust collection electrode plate 32 after the ascent. The brush unit 50 wipes down dust adhering to the surface of the dust collecting electrode plate 32 while sliding the tip of the brush element wire 62 and the surface of the dust collecting electrode plate 32. The dust collecting electrode plate 32 from which the dust has been removed by the brush unit 50 is sequentially raised, and dust in the air is collected on the surface by the principle of electric dust collection in the upper discharge region and then lowered again.

  FIG. 5 is an enlarged view of the brush unit 50 shown in FIG. The brush unit 50 has a channel brush 60 extending in the width direction (perpendicular to the paper surface) on both surfaces of the dust collecting electrode plate 32, and the channel brush 60 is in contact with both surfaces of the dust collecting electrode plate 32 while supporting the root of the channel brush 60. And a shaft 51 that can be rotated and adjusted. The channel brush 60 is disposed so as to be in contact with the dust collection electrode plate 32 while being inclined upward by a predetermined angle with respect to the surface of the dust collection electrode plate 32 (advancing direction of the dust collection electrode plate 32). When the channel brush 60 wears out and becomes difficult to contact the dust collecting electrode plate 32, the shaft 51 is rotated so that the channel brush 60 is directed downward from the current position so as to contact the dust collecting electrode plate 32. Can be adjusted. The channel brush 60 is sandwiched between a rib 52 provided on the shaft 51 and a fixture 54.

  1 is a perspective developed view of the brush unit 50, FIG. 2 is a perspective view of the channel brush 60, FIG. 3 is an enlarged view of the brush unit 50 shown in FIG. 5, and FIG. It is. The configuration of the brush unit 50 will be described in detail with reference to these drawings.

  As shown in FIG. 1, flat ribs 52 are welded in the longitudinal direction of the outer peripheral surface of the shaft 51. In the thickness direction of the rib 52, a through hole 52 a for passing the bolt 57 is provided. A channel brush 60 is sandwiched between the rib 52 and a plurality of fixtures 54 arranged in the longitudinal direction of the rib 52.

  As shown in FIG. 2, the channel brush 60 includes a channel (grooved steel) shaped strip 63 and a plurality of brush strands 62, and the brush strand 62 is sandwiched between the strips 63. Yes. The strip 63 is made of, for example, stainless steel. The band 63 has a U-shaped cross section before the brush strand 62 is sandwiched. The brush strand 62 is made of a fine stainless wire having a diameter of about 0.5 mm, for example. A bent portion formed by bundling a large number of the brush strands 62 and folding the core rod 61 in two along the axis is inserted into the groove of the strip 63 from the upper opening and disposed in the groove. In this state, the upper end portion of the belt-like body 63 is caulked to prevent the brush strand 62 from coming off, and the upper portion of the bent portion of the brush strand 62 is crimped and clamped. Thereby, the strip | belt-shaped body 63 is formed in the triangular base which has a triangular cross section, and becomes the brush unit 50 which has a triangular base.

  As shown in FIG. 1, the fixture 54 has a channel shape and is arranged in a U shape when viewed from above. A cutout portion 54 a is provided at each upper portion of the U-shaped tip of the fixture 54. The notch 54 a is notched along the bottom surface and the slope of the triangular pedestal of the strip 63. As shown in FIGS. 3 and 4, the bottom surface and the slope of the triangular pedestal formed by the band-like body 63 are brought into close contact with and engaged with the notch 54a, so that the channel brush 60 does not move. 52 can be fixed. A through hole 54 b through which the bolt 57 is passed is provided at the center of the fixture 54.

  Bolts 57 are passed from the ribs 52 to the through holes 52 a of the ribs 52 and the through holes 54 b of the fixtures 54, and washers 55 are passed from the fixtures 54 to the bolts 57 and nuts 56 are screwed together. . In the present embodiment, the bolt 57 and the nut 56 serve as fastening means for fastening the rib 52 and the fixture 54. The fastening means is not limited to the bolt 57 and the nut 56, and may be any means that can be detachably fastened without applying heat, such as a set screw, a hook, an adhesive tape, and a binding band.

  3 and FIG. 4, the end portion 63 a on the side where the brush element wire 62 of the belt-like body 63 is disposed is outward from the edge of the rib 52 and the fixture 54, as shown in FIGS. 3 and 4. It will be exposed. As a result, the brush strand 62 does not come into contact with the edges of the ribs 52 and the fixtures 54, and therefore the brush strand 62 is not greatly bent at the contact portion, so that the bending stress applied to the brush strand 62 is reduced. Therefore, the life of the brush element wire 62 can be extended.

  When the brush 62 is worn and the channel brush 60 is replaced, the bolt 57 and the nut 56 are unfastened and the old channel brush 60 is removed. Instead, the new channel brush 60 is replaced with the rib 52 and the fixture 54. The rib 52 and the fixture 54 are fastened with bolts 57 and nuts 56. In this way, when the brush element 62 is worn, only the channel brush 60 needs to be replaced, and it is not necessary to replace the entire brush unit 50, so the cost can be reduced.

  As described above, since the brush unit 50 can be assembled without attaching the channel brush 60 to the shaft 51 or the rib 52 by welding, the brush strand 62 is not damaged by heat, and the brush strand 62 is not damaged. The lifetime can be extended. As a result, the frequency of replacement of the channel brush 60 can be reduced, and the time and effort of replacement can be saved. When the replacement is performed, the entire brush unit need not be replaced. A dust device can be provided.

  In the above-described embodiment, the example in which one brush unit 50 is linearly attached in the longitudinal direction of the shaft 51 has been described. However, the number of brush units 50 attached to the shaft 51 is arbitrarily selected as necessary. Can do. Further, a plurality of brush units 50 may be arranged in a spiral shape and the shaft 51 may be rotated by power. In the above-described embodiment, the plurality of fixtures 54 are used, but a plurality of fixtures 54 formed integrally may be used.

14 ......... Discharge electrode, 15 ......... Moving electrode, 26 ......... Driving wheel, 28 ......... Roller, 30 ......... Endless chain, 32 ......... Dust collector plate, 34 ......... Shaft, 50 ......... Brush unit, 51 ......... Shaft, 52 ......... Rib, 52a ......... Through hole, 54 ......... Fixture, 54a ......... Notch, 54b ......... Through hole, 55 ... ... Washers, 56 ......... Nuts, 57 ......... Bolts, 60 ......... Channel brushes, 61 ......... Core bars, 62 ......... Brush strands, 63 ......... Strips, 63a ......... Ends .

Claims (4)

A rib provided in the longitudinal direction of the outer peripheral surface of the shaft;
A brush with a plurality of brush strands sandwiched between strips,
A fixture for sandwiching the belt-like body with the rib;
A moving electrode type electrostatic precipitator comprising: fastening means for detachably fastening the rib and the fixture in a state where the belt-like body is sandwiched between the rib and the fixture. Brush unit for use.   The brush unit for a moving electrode type electrostatic precipitator according to claim 1, wherein the fixture is provided with a notch, and the belt-like body is engaged with the notch of the fixture. .   The end on the side where the plurality of brush strands are disposed in the belt-like body is exposed to the outside from the edge of the rib and the fixture. Brush unit for moving electrode type electrostatic precipitator.   A moving electrode type electrostatic precipitator comprising the brush unit according to any one of claims 1 to 3.

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