JP3440403B2 - Collector of electric dust collector - Google Patents

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic precipitator, and more particularly to improvement of the structure of a collector section.

[0002]

2. Description of the Related Art An electrostatic precipitator is composed of a charging section for generating a corona discharge between a discharge electrode and a counter electrode, and a collector section for collecting the charged dust. FIG. 14 is a schematic sectional view showing a main part of a collector portion of a conventional dust collector shown in Japanese Patent Laid-Open No. 8-38936. In the figure, 31 is a collector body, 32 is a collector body 3
A frame body for accommodating 1 therein, 33 an applying electrode plate, 34 a dust collecting electrode plate, a stainless steel plate member punched into a long plate shape, and provided with a large number of spacer protrusions 35.

Reference numeral 36 is an application column for applying a high voltage to the application electrode plate 33, 37 is a ground column for grounding the dust collecting electrode plate 34, and the application electrode plate 33 is attached to the application column 36. The dust collecting electrode plates 34 are mechanically fixed to the grounding columns 37, respectively. 38 is a spacer protrusion 35
An abutting portion 39 that abuts on is a communication port that communicates the clearance C with the outside.

With the above-described structure, the clearance C for draining water is formed between the frame body 32 and the dust collecting body 31. When the deer collecting unit main body 31 is washed, it is soaked in a washing liquid and washed with water, but the liquid at the time of washing flows out from the clearance C through the communication rod 39 to the outside to improve the drainage property. .

[0005]

In the collector portion of the conventional electrostatic precipitator as described above, the applying electrode plate 33 and the collecting electrode plate 34 are arranged between the applying strut 36 and the grounding strut L, respectively.
Since it is disposed so as to face each other, the space between the inside of the frame 32 and the application strut 36 or the space D between the grounding strut 2 becomes a useless space where dust is not collected, and there is a problem that the dust collection efficiency decreases. . On the other hand, if the collector part is not cleaned, the amount of attached dust will increase, which may cause performance deterioration, noise generation, ozone generation, dust ignition, etc.In general, industrial electrostatic precipitators adhere to the electrode plate. Dust is periodically removed by mechanical impact by punching, etc.For consumer use, as described above, the collector element is removed and washed with a cleaning liquid or high pressure cleaning, then dried and reused. Was there.

However, elements such as entertainment facilities are particularly dirty with cigarette smoke and require cleaning work for about 10 days, and it is troublesome and difficult for the user to take out the element regularly and clean it. There is a problem in that sparks and the like are likely to occur if the operation is performed within the dead space, and that it costs too much to ask a maintenance company. There is also a disposable type in which the collector part is a simple filter type, but there is a problem that the dust collection performance is greatly inferior.

The present invention has been made in order to solve the above problems, has a high dust collecting efficiency, can remove dust as a simple maintenance, and extends the interval of full-scale maintenance (for example, cleaning). In addition, it is an object of the present invention to obtain a collector part of an electrostatic precipitator that does not require maintenance.

[0008]

A collector portion of an electrostatic precipitator according to the present invention is an electrostatic precipitator for collecting dust by alternately arranging long plate-shaped high-voltage electrode plates and dust collecting electrode plates along an air flow. In the collector part of the high voltage electrode plate, one end of the high voltage electrode plate in the longitudinal direction is fixed and a voltage is applied, and the other end of the dust collecting electrode plate in the longitudinal direction is fixed and grounded. A recess provided at the other end of the high-voltage electrode plate so as to be disposed with a space for the power supply column, and a recess provided at the other end of the dust collection electrode plate for being disposed with the space for the power supply column. and a recess on both side surfaces of the high voltage electrode plates, which in pairs extend in a direction parallel to the air flow
A plurality of insulating protrusions are provided at regular intervals along the direction perpendicular to the dust collecting electrode plate.

Further, the high voltage electrode plate or the dust collecting electrode plate is slidable in the longitudinal direction by at least a certain distance between the insulating protrusions.

Further, at the airflow upstream end of the insulating protrusion,
The dust collecting electrode plate is provided with a protrusion step portion that is in contact with the end portion of the dust collecting electrode plate on the air flow upstream side and has an L-shaped cross section.

Further, there is provided slide driving means for sliding the high voltage electrode plate or the dust collecting electrode plate.

Further, a casing having an air passage having a blower between the suction port and the air outlet, a collector portion and a driving means mounted in the air passage, and a slide driving means provided on the downstream side of the collector portion in the air flow direction. And a dust storage filter box that collects dust scraped off while operating the blower.

In the collector part of the electrostatic precipitator in which long plate-shaped high voltage electrode plates and dust collecting electrode plates are alternately arranged along the air flow to collect dust, one end of the high voltage electrode plate in the longitudinal direction is A power supply column for fixing and applying a voltage, a grounding column for fixing one end of the dust collecting electrode plate in the longitudinal direction and grounding, and the high voltage electrode plate so as to be arranged with a gap with the grounding column. Inserted between the high voltage electrode plate and the dust collecting electrode plate, and a recess provided at the other end of the dust collecting electrode plate so as to be disposed with a gap with the power feeding support column. And extend in a direction parallel to the air flow .
And a plurality of protrusions that are provided at regular intervals along the direction perpendicular to the protrusions, the protrusions contacting the side surface of the dust collecting electrode plate and the high voltage electrode plate, and at least the protrusions.
And an insulating spacer slidable in the longitudinal direction by a predetermined distance.

[0014]

BEST MODE FOR CARRYING OUT THE INVENTION Embodiment 1 of the Invention FIG. 1 is a schematic cross-sectional configuration diagram of a general two-stage charging type electrostatic precipitator, FIG. 2 is a perspective view of a collector portion of the electrostatic precipitator which is Embodiment 1, and FIG.
FIG. 4 is a cross-sectional view of the collector part, and FIG. As shown in FIG. 1, the electrostatic precipitator includes an ionization unit 1 that charges inflowing dust by corona discharge, and a collector unit 2 that attracts the charged dust to a ground electrode plate by Coulomb force. Then, between the counter electrode plate 3 and the discharge electrode plate 4 of the ionization part 1, several KV from the DC power supply 7,
A voltage of several KV is applied from the DC power supply 8 also between the high voltage electrode plate 5 and the dust collecting electrode plate 6.

In FIG. 1, the ionization section 1 is arranged in parallel with each other and is composed of a counter electrode plate 3 which is grounded and a discharge electrode plate 4 which is arranged in the middle between them. The collector section 2 in FIGS. A plurality of long plate-shaped high-voltage electrode plates 5 and grounded dust collecting electrode plates 6 are alternately arranged in parallel. High voltage electrode plate 5 is the entire circumference is overturned insulated object. In FIG. 2, 9 on both sides face in the thickness direction of the high-voltage electrode plates 5, the air flow
To the direction parallel to
A plurality of insulating protrusions are provided at regular intervals along the direction . Reference numeral 10 is a power supply column for applying a high voltage to the high-voltage electrode plate 5, 11 is a grounding column for grounding the dust collecting electrode plate 6, and the high-voltage electrode plate 5 is attached to the power supply column 10.
The dust collecting electrode plates 6 are electrically connected to the grounding columns 11 and are mechanically fixed thereto.

Reference numeral 12 is a case for accommodating the dust collecting electrode plate 6 fixed to the grounding column 11 and the high voltage electrode plate 5 fixed to the power feeding column 10 and alternately inserted between the dust collecting electrode plates 6. Is. Although not shown, the case 12 is composed of divided parts for easy assembly. Ground support 1
1 is fixed to the case 12, and the power supply column 10 is fixed to the case 12 while being electrically insulated from the case 12 via an insulating member such as an insulator. Reference numerals 13a, 13b, 13c, and 13d denote support bars that are attached to both ends of the case 12 and hold the high-voltage electrode plate 5 and the dust collecting electrode plate 6 inside the case 12 at fixed positions.

FIG. 4A is a perspective view showing a state in which the high-voltage electrode plate 5 is fixed to the power supply column 10, and FIG. 4B shows a state in which the dust collecting electrode plate 6 is fixed to the ground column 11. Perspective view,
FIG. 4C is a perspective view showing a state in which the high voltage electrode plate 5 is inserted between the dust collecting electrode plates 6 via the insulating protrusion 9. In FIG. 4A, 5a is provided on the high voltage electrode plate 5,
This is a recess formed so that the grounding column 11 can penetrate with a gap in a state where the high voltage electrode plate 5 and the dust collecting electrode plate 6 face each other. In FIG. 4B, 6a is provided on the dust collecting electrode plate 6, and the high voltage electrode plate 5 and the dust collecting electrode plate 6 face each other.
It is a recess formed so that the power supply column 10 can penetrate with a gap.

In such a structure, the dust collecting electrode plate 6 has one grounding pillar 11 and supporting bars 13a, 13b, 13.
The high-voltage electrode plate 5 is held by c and 13d, and the high-voltage electrode plate 5 includes one power supply column 10 and support bars 13a, 13b, 13c, and
It is held by d and is inserted between the dust collecting electrode plates 6 so as to face the high voltage electrode plate 5. At this time, the high voltage electrode plate 5
Since the recess 5a is provided, it can be inserted into the inside of the grounding support 11 and the case 12, and the dust collecting electrode plate 6 is provided with the recess 6a so that it can be inserted into the inside of the power supply support 10 and the case 12. Therefore, the high voltage electrode plate 5 and the dust collecting electrode plate 6 face each other between the power supply column 10 and the inside of the case 12 (L1 in FIG. 3) and between the ground column 11 and the inside of the case 12 (L2 in FIG. 3). is doing. The distance between the high voltage electrode plate 5 and the dust collecting electrode plate 6 is kept constant by the insulating protrusion 9.

The inflowing air flows not only between the power supply column 10 and the grounding column 11 but also between the power supply column 10 and the grounding column 11 and the inside of the case 12.

As described above, the high-voltage electrode plate 5 and the dust collecting electrode plate 6 can be opposed to each other over the entire inflow area of the air flow, and there is no bypass flow passage, and the dust collecting efficiency can be improved. You can

Embodiment 2. 5 is a sectional view of a collector portion of the electrostatic precipitator according to the second embodiment, and FIG. 5A is a sectional view of the collector during operation,
FIG. 5B is a sectional view of the collector showing a state during maintenance. FIG. 6 is an exploded perspective view of the main part of the collector part when it is removed from the case. In the figure, parts that are the same as or correspond to those in FIG. 2 shown in Embodiment 1 are assigned the same reference numerals and explanations thereof are omitted. In FIG. 5, reference numeral 12a denotes a case main body which is a first case member to which the dust collecting electrode plate 6 is fixed via the grounding strut 11, and 12b denotes the high voltage electrode plate 5 fixed via the power feeding strut 10. The second case member is a slide portion, and 14 is a handle.

In such a structure, during maintenance, when the handle 14 is grasped and the slide portion 12b is taken in and out from the case body 12a, the tip of the insulating projection 9 provided on the high-voltage electrode plate 5 will be the dust collecting electrode plate. Since they are in contact with each other, the dust accumulated on the dust collecting electrode plate 6 is scraped off. At this time, the amount of sliding in and out of the slide portion 12b may be at least the distance P between the insulating protrusions 9.

As described above, the dust can be removed by a simple operation.

In this embodiment, the high voltage electrode plate 5
However, the dust collecting electrode plate 6 may be slid.

Further, in this embodiment, the insulating projection 9 is provided on the high voltage electrode plate 5 having an insulating coating. However, as shown in FIG. 7, two insulating frame-like spacers having the projection 15a are provided. −
A high voltage electrode plate 16 without an insulating coating and insulating projections 9 may be sandwiched between 15 parts. 15b
Is a recess formed so that the grounding column 11 can penetrate with a gap in a state where the high voltage electrode plate 5 and the dust collecting electrode plate 6 face each other,
Reference numeral 15c is a hole for fixing the power supply column 10.

Further, in this embodiment, the high voltage electrode plate 5 having the insulating projections 9 is slid to collect the dust collecting electrode plate 6.
Only dust accumulated on the high voltage electrode plate 5
In place of the plate-shaped electrode plate excluding the insulating coating and the insulating protrusion 9,
Even if an insulating spacer 17 having a protrusion 17a is inserted between the high voltage electrode plate 5 and the dust collecting electrode plate 6 as shown in FIG. Good. With such a configuration, dust is mainly collected on the dust collecting electrode plate 6, but even if a little dust is attached to the high-voltage electrode plate 5, the dust on both the dust collecting electrode plate 6 and the high-voltage electrode plate is scraped off. be able to. In FIG. 8, 17b is a recess for forming a gap with the ground support 11, 11c is an elongated hole for forming a gap with the power supply support 10, and 17d is a case where the insulating spacer 17 is attached to the case. It is a mounting hole.

Embodiment 3. In the second embodiment, the dust adhering to the side surface of the dust collecting electrode is scraped off, but in the present embodiment, the dust at the air flow upstream end (edge) of the dust collecting electrode is also scraped off. Is. FIG. 9 is a diagram showing a state where dust is attached to the dust collecting electrode, and FIG. 10A is a partial top view of an air inlet of the collector unit 2 according to the third embodiment.
10B is a sectional view taken along line AA, and FIG. 11 is a perspective view of the high voltage electrode. FIG. 9 shows that, when dust is collected by the collector part 2, a large amount of current flows in the end 6b of the dust collecting electrode 6 on the upstream side of the air flow, and the fact that it is on the upstream side of the air flow synergistically.
8 shows that a large number of 8 are attached. In FIGS. 10 and 11, 5 is an insulating-coated high-voltage electrode, 6 is a dust collecting electrode,
Reference numeral 19 denotes an insulating protrusion provided on both side surfaces of the high-voltage electrode 5 in parallel with the air flow at a constant interval. The insulating protrusion 19 extends in the height direction of the end of the insulating protrusion 19 on the upstream side of the air flow. The projection step portion 19a is provided, which has an L-shaped cross section and is in contact with the dust collection electrode 6 in a state of covering the air flow upstream side end portion. Reference numeral 19b is a recess formed so that the grounding column 11 can penetrate with a gap in a state where the high voltage electrode plate 5 and the dust collecting electrode plate 6 face each other.

In such a structure, during maintenance, when the high voltage electrode plate 5 is slid in the longitudinal direction,
Since the tip of the insulating protrusion 9 provided on the high-voltage electrode plate 5 is in contact with the dust collecting electrode plate 6, dust accumulated on both side surfaces of the dust collecting electrode plate 6 is scraped off, and the protrusion step portion is further cut off. 19a
Are in contact with the end of the dust collection electrode 6 on the upstream side of the air flow, so that the dust accumulated on the end of the dust collection electrode 6 on the upstream side of the air flow is scraped off.

As described above, the dust collecting electrode plate 6 can be easily operated.
It is possible to remove the dust accumulated on both side surfaces of the and the dust accumulated on the ends of the dust collecting electrodes 6 on the upstream side of the air flow. Further, since the end portion of the dust collecting electrode 6 is supported by the protruding step portion 19a,
It is possible to reduce the number of support bars 13a to 13d described in the first embodiment.

Fourth Embodiment In the second embodiment, at the time of maintenance, the sliding portion of the case to which the high-voltage electrode plate having the insulating protrusion is attached is manually moved,
Although the one that scrapes off the accumulated dust has been shown, the present embodiment automatically scrapes off the dust that has accumulated on the dust collecting electrode plate 6. FIG. 12 is a schematic view of a collector part of an electrostatic precipitator provided with a driving means for a slide part according to the fourth embodiment, and FIG. 12 (a) shows a state where the collector part is in use and the motor 20 is stopped. FIG. 12 (b) shows that the motor 20 is rotated and the crank 21
The high voltage electrode plate which has the insulating protrusion connected to FIG. The case is omitted. In the figure, reference numeral 21 is a drive means, which is composed of a crank 21b rotatably connected to a motor 21a and a power supply column 10 which is fixed to a slide portion (not shown) of the case and which fixes the high voltage electrode 5.

In such a structure, when the driving means 21 is driven during maintenance, the high-voltage electrode plate having an insulating protrusion connected to the crank 21b is taken in and out, and the dust accumulated on the dust collecting electrode plate 6 is removed. It is scraped off.

As described above, the dust can be automatically removed without manpower.

Embodiment 5. FIG. 13 is a sectional view of the electrostatic precipitator according to the fifth embodiment. 1 is an ionization part, 2 is a collector part, 21 is a drive means, 22 is a suction port, 23 is a blowout port, 24 is a blower, 25
Is a casing, and 26 is a dust storage filter box that collects the dust that has been scraped off.

In such a configuration, during maintenance, the drive means 21 is operated while the blower 24 is operating.
Is driven to move the high-voltage electrode plate 5 having the insulating projections 9 in and out to scrape off the dust accumulated on the dust collecting electrode plate 6, and the dust is further removed by the suction force of the blower 24. And the dust that has been scraped off is a dust storage filter box 2
Captured by 6.

As described above, since the dust is collected in the dust storage box, the processing can be simplified. Further, since the blower is operated, the dust that cannot be removed even if the high voltage electrode plate 5 is taken in and out can be removed, and the dust removal efficiency can be improved.

[0036]

As described above, the collector part of the electrostatic precipitator according to the present invention is an electric collector for collecting dust by alternately arranging long plate-shaped high voltage electrode plates and dust collecting electrode plates along the air flow. In the collector portion of the dust collector, a power supply column for fixing one end of the high-voltage electrode plate in the longitudinal direction and applying a voltage, and a grounding column for fixing one end of the dust collection electrode plate in the longitudinal direction and grounding, A recess provided at the other end of the high-voltage electrode plate so as to be arranged with a grounding column and a gap, and provided at the other end of the dust collecting electrode plate so as to be arranged with the power feeding column and a gap. and recesses on both side surfaces of the high voltage electrode plates, which in pairs extend in a direction parallel to the air flow
Since a plurality of insulating protrusions are provided at regular intervals along the direction perpendicular to each other , and the tips of the protrusions contact the dust collecting electrode plate, the high voltage electrode plate and the high voltage electrode plate are collected over the entire inflow area of the air flow. The dust electrode plate can be made to face, there is no bypass channel, and the dust collection efficiency can be improved.

Further , since the high voltage electrode plate or the dust collecting electrode plate is slid in the longitudinal direction by at least the constant distance between the insulating protrusions, the dust can be removed by a simple operation.

At the end of the insulating projection on the upstream side of the air flow,
The dust collector electrode plate has an L-shaped projecting step portion that is in contact with the end portion of the dust collector electrode on the upstream side of the airflow. Dust accumulated on the upstream end can be removed.

Further, since the slide driving means for sliding the high voltage electrode plate or the dust collecting electrode plate is provided, the dust can be automatically removed without the need of manpower.

Further, a casing having an air passage having a blower between the suction port and the air outlet, a collector portion and a driving means mounted in the air passage, and a slide driving means provided on the air flow downstream side of the collector portion. When it operates, it has a dust storage filter box that collects the dust scraped off while operating the blower, so that the dust can be easily treated, and since the blower is operated, the dust The removal efficiency can be improved.

Further, in the collector part of the electrostatic precipitator in which long plate-shaped high voltage electrode plates and dust collecting electrode plates are alternately arranged along the air flow to collect dust, one end in the longitudinal direction of the high voltage electrode plate is A power supply column for fixing and applying a voltage, a grounding column for fixing one end of the dust collecting electrode plate in the longitudinal direction and grounding, and the high voltage electrode plate so as to be arranged with a gap with the grounding column. Inserted between the high voltage electrode plate and the dust collecting electrode plate, and a recess provided at the other end of the dust collecting electrode plate so as to be disposed with a gap with the power feeding support column. And extend in a direction parallel to the air flow .
And a plurality of protrusions that are provided at regular intervals along the direction perpendicular to the protrusions, the protrusions contacting the side surface of the dust collecting electrode plate and the high voltage electrode plate, and at least the protrusions.
Since the insulating spacers are slidable in the longitudinal direction by a certain distance between them, dust on both the high voltage electrode plate and the dust collecting electrode plate can be removed by a simple operation.

[Brief description of drawings]

FIG. 1 is a schematic cross-sectional configuration diagram showing a collector portion of an electrostatic precipitator which is Embodiment 1 of the present invention.

FIG. 2 is a perspective view of a collector portion of the electrostatic precipitator which is Embodiment 1 of the present invention.

FIG. 3 is a sectional view of a collector portion of the electrostatic precipitator which is Embodiment 1 of the present invention.

FIG. 4 is an exploded perspective view of a main part of a collector portion of the electrostatic precipitator according to the first embodiment of the present invention.

FIG. 5 is a sectional view of a collector portion of an electrostatic precipitator which is Embodiment 2 of the present invention.

FIG. 6 is an exploded perspective view of a main part of a collector portion of an electrostatic precipitator which is Embodiment 2 of the present invention.

FIG. 7 is a perspective view of a high-voltage electrode of a collector portion of the electrostatic precipitator which is Embodiment 2 of the present invention.

FIG. 8 is a perspective view of an insulator spacer of a collector portion of the electrostatic precipitator which is Embodiment 2 of the present invention.

FIG. 9 is a diagram showing a state in which dust is attached to a dust collecting electrode of a collector portion of the electrostatic precipitator.

FIG. 10 is a top view and a sectional view of a collector portion of an electrostatic precipitator which is Embodiment 3 of the present invention.

FIG. 11 is a perspective view of a high voltage electrode of a collector portion of an electrostatic precipitator which is Embodiment 3 of the present invention.

FIG. 12 is a schematic configuration diagram of a collector section of an electrostatic precipitator provided with a drive unit for a slide section that is Embodiment 4 of the present invention.

FIG. 13 is a sectional view of an electrostatic precipitator which is Embodiment 5 of the present invention.

FIG. 14 is a schematic sectional view showing a main part of a collector of a conventional electrostatic precipitator.

[Explanation of symbols]

2 collector part, 5 high-voltage electrode plate, 5a, 6a concave part, 6 dust collecting electrode plate, 9, 19 insulating protrusion, 10 power supply column, 11 grounding column, 12 case, 12a
Slide part, 12b case body, 17 insulating spacer, 17a protrusion, 19 L-shaped protrusion step, 21
Drive means, 25 casing, 26 dust storage filter box, 22 suction port, 23 air outlet, 24 blower.

─────────────────────────────────────────────────── ─── Continuation of the front page (56) References JP-A-6-63444 (JP, A) JP-A-2-218454 (JP, A) JP-A-60-130430 (JP, A) Actual Kaihei 5- 22043 (JP, U) Actual development 50-47075 (JP, U) Actual development Hei 7-13449 (JP, U) (58) Fields investigated (Int.Cl. ⁷ , DB name) B03C 3/00-3 / 88

Claims (6)

(57) [Claims] 1. A collector part of an electrostatic precipitator for collecting dust by alternately arranging long plate-shaped high-voltage electrode plates and dust collecting electrode plates along an air flow, wherein one end of the high-voltage electrode plate in the longitudinal direction is A power supply column for fixing and applying a voltage, a grounding column for fixing one end of the dust collecting electrode plate in the longitudinal direction and for grounding, and the high-voltage electrode plate so as to be disposed with a gap with the grounding column. A recess provided at the other end of the dust collecting electrode plate, and a recess provided at the other end of the dust collecting electrode plate so as to be disposed with a gap with the power feeding support column, and to both side surfaces of the high voltage electrode plate for air flow . This extends in the direction parallel against
2. A collector part of an electrostatic precipitator, comprising: a plurality of insulating projections, which are provided at regular intervals along a direction perpendicular to the dust collection electrode, and whose tips are in contact with the dust collecting electrode plate. 2. The collector part of the electrostatic precipitator according to claim 1, wherein the high-voltage electrode plate or the dust collecting electrode plate is slidable in the longitudinal direction by at least a certain distance between the insulating projections. 3. A projection step portion having an L-shaped cross section, which is in contact with the airflow upstream end of the insulating projection in a state of covering the airflow upstream end of the dust collecting electrode plate. Claim 1
Or the collector part of the electrostatic precipitator according to claim 2. 4. The collector part of the electrostatic precipitator according to claim 2, further comprising slide driving means for sliding the high-voltage electrode plate or the dust collecting electrode plate. 5. A casing in which an air passage having a blower between an inlet and an outlet and a collector portion and a driving means are mounted in the air passage, and a slide driving means provided on the downstream side of the collector portion in the air flow direction. The dust collector filter box for collecting dust scraped off while operating the blower when the blower operates, the collector part of the electrostatic precipitator according to claim 4. 6. A collector part of an electrostatic precipitator for collecting dust by alternately arranging long plate-shaped high-voltage electrode plates and dust collecting electrode plates along an air flow, wherein one end of the high-voltage electrode plate in the longitudinal direction is A power supply column for fixing and applying a voltage, a grounding column for fixing one end of the dust collecting electrode plate in the longitudinal direction and for grounding, and the high-voltage electrode plate so as to be disposed with a gap with the grounding column. A recess provided at the other end of the dust collecting electrode plate, a recess provided at the other end of the dust collecting electrode plate so as to be arranged with a gap between the power feeding column, and the recess between the high voltage electrode plate and the dust collecting electrode plate. is, perpendicular to this extends in a direction parallel to the air flow
A plurality of protrusions are provided at regular intervals along the different directions, and the projections have projections that abut the dust collecting electrode plate side surface and the high-voltage electrode plate, and slide in the longitudinal direction at least for a constant distance between the projections. The collector part of the electrostatic precipitator characterized by including the insulating spacer.