JP2000288424A - Electrostatic dust collector - Google Patents

Abstract

PROBLEM TO BE SOLVED: To obtain a desired dust collecting performance by ensuring stable electric charge and also to improve the reliability of the subject device by preventing the deformation by heat and moreover to reduce a production cost. SOLUTION: This collector device is constituted so that the deformation resulted from the distortion of an electrode is eliminated and also the vibration of the electrode is eliminated in operation by adjusting the holding tightness to the electrode 6 uniformly by means of each stepped collar 50, and also the device may be returned to normal temp. without residual distortion by eliminating the distortion of the electrode 6 even if the electrode 6 is deformed by abnormal high temp. Moreover, the assembling may be facilitated by adjusting holding tightness to the electrode 6 by using the stepped collar 50.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrostatic precipitator for collecting fine particulate matter in an inflowing gas.

[0002]

2. Description of the Related Art For example, in a road tunnel, an electric precipitator for treating exhaust gas generated from a vehicle or the like is installed for the purpose of improving the visibility of a vehicle driver and environmental measures such as ventilation of air in the tunnel. You. As an electric precipitator adopted as this electric precipitator for tunnels, for example, the one described in JP-A-10-28897 is known.

The electric precipitator described in this publication is a flat plate-shaped precipitating electrode extending in the flow direction of the flowing gas and arranged side by side so as to face each other, and is disposed at the center between the precipitating electrodes. And a discharge electrode in the form of a flat plate. The dust collection electrode and the discharge electrode are insulated from each other and bound together by a large number of electrode support fittings.

[0004] The electrode support has a collar for equalizing the electrode interval between the electrodes of the same polarity, and the electrodes of the same polarity are tightened through the collar to hold a narrow pressure by the collar. What binds electrodes of the same polarity is generally known.

[0005]

Here, the tightening force of the above-mentioned electrode support bracket is not constant for each electrode support bracket, but differs for each electrode support bracket. That is, the narrow pressure holding force of each collar applied to the same electrode is not sufficient. The electrodes are different from each other and deform due to distortion. When the electrodes are deformed in this way, the electrode spacing between the electrodes having different polarities facing each other is greatly different, the charging becomes unstable, and the dust collection performance is reduced. In the worst case, spark discharge (spark) may occur at a location where the electrode spacing is close, and dust collection may not be possible. This deformation may occur at the initial stage of electrode assembly or may occur over time after assembly. Deformation that occurs at the initial stage of electrode assembly can be handled at the time of assembling, but deformation over time occurs after installation and trial operation, so it can not be dealt with and stable charging is not ensured, resulting in deterioration of dust collection performance .

Further, as described above, if the operation is performed with a high-speed gas flow in a state in which the clamping force by the electrode support metal is different for each electrode support metal, vibration is applied to the electrode due to the turbulence caused by the high-speed gas flow. appear. When the vibration width is large, as in the case described above, stable charging is not ensured, so that the dust collection performance is reduced. In particular, in the electric dust collector for tunnels, in recent years, it has been required to further increase the tunnel ventilation flow velocity (9 m / s or more as an average passage velocity in the electric dust collector), and this vibration becomes large. Is inevitable.

Therefore, in order to avoid these problems, the electrodes must be assembled with great care when assembling.
In this case, the manufacturing cost is significantly increased.

SUMMARY OF THE INVENTION The present invention has been made to solve such a problem, and it is possible to obtain a desired dust collection performance by securing a stable charge and reduce the manufacturing cost. The purpose is to provide.

[0009]

In the electrostatic precipitator according to the present invention, the flat electrode extending in the flow direction of the inflowing gas is face-to-face in a direction perpendicular to the flow direction of the gas and is arranged with the same poles. In the installed electrostatic precipitator, a plurality of stepped collars disposed between the electrodes having the same polarity and having a step portion having a smaller diameter than the main body portion at one end outer peripheral surface are provided between the same electrodes. A stepped portion of the collar is formed in the through-hole formed in the electrode and penetrating in the axial direction, and the end face of the stepped portion of one stepped collar and the stepped portion of the other stepped collar are juxtaposed in the electrode juxtaposition direction. The end face of the opposite end is pressed against the electrode, and the electrode forms a step of the stepped portion of one stepped collar. The surface orthogonal to the axial direction and the opposite side of the stepped portion of the other stepped collar. And a narrow pressure is held by the end surface of the end portion.

According to the electrostatic precipitator configured as described above, each stepped collar allows the electrode to have a surface perpendicular to the axial direction forming the step of the stepped portion of one stepped collar and the other stepped collar. Since the narrow pressure is held between the collar and the end face of the end opposite to the step, the interference with the electrode of each stepped collar is made the same. For this reason, the deformation due to the distortion of the electrode is eliminated, and the vibration of the electrode during operation is eliminated. In addition, since the electrode is not distorted in this way, even if the electrode is thermally deformed at this time due to a high temperature operation (about 90 °), for example, in a case of a tunnel fire, there is no residual distortion if the electrode returns to a normal temperature state. Will be restored. Further, by using such a stepped collar, the interference of each stepped collar with respect to the electrode is made the same, thereby facilitating the assembly.

Here, in a state before the electrode is narrowed, the thickness of the electrode is set so that the thickness of the electrode is equal to the axis between a surface orthogonal to the axial direction forming the step of the step of the stepped collar and the end face of the step. It is preferably set to be 0.01 mm to 0.02 mm longer than the length in the direction.

When the length is longer than 0.02 mm, the electrode tends to be distorted, and when the length is shorter than 0.01 mm, it is not possible because of the thickness crossing of the electrode material and the manufacturing accuracy of the stepped collar. It is.

Also, a screw is formed at both ends while the stepped collar is inserted, and a nut is screwed into the screw so that the electrode of the same polarity is connected to the electrode of the same polarity through the stepped collar. It is preferable to include a tie rod that binds to the end electrode located on the outermost side in the juxtaposition direction, and co-rotation prevention means that prevents the tie rod from rotating together when the nut is screwed.

When such a configuration is adopted, the co-rotation preventing means prevents the tie rods from rotating together when the nut is screwed, and prevents the application of torsional force to the electrode via the stepped collar. For this reason, the wavy deformation of the electrode caused by the application of the torsional force is prevented.

[0015]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Preferred embodiments of the present invention will be described below with reference to the accompanying drawings. In each of the drawings, the same elements are denoted by the same reference numerals, and redundant description will be omitted.

FIG. 1 is a front view showing an electrostatic precipitator according to a first embodiment of the present invention, which is a front view mainly showing a charging section. FIG. 2 is a cross-sectional view taken along line AA of FIG. , FIG.
1 is a cross-sectional view taken along the line CC of FIG. 1, and FIG. 4 is a cross-sectional view taken along the line D-D of FIG. , An electric dust collector for tunnels used for tunnels.

As shown in FIGS. 1 to 4, an electric dust collector 1
Includes a box-shaped case 8 as a housing. This case 8 is passed through a ventilation fan (not shown) on the front side (FIG. 1).
A gas inlet 8a is formed at the front and a gas outlet 8b is formed at the rear in order to allow exhaust gas to flow in from the front side of the drawing).

Inside the case 8, as shown in FIG.
Along with the flow direction B of the gas flowing from the gas inlet 8a, the charging unit 2 that gives an electric charge to the particulate matter in the gas is arranged, and the charging unit 2 is disposed downstream of the charging unit 2. A collecting unit 3 for collecting the particulate matter that has passed through and charged is disposed, and a charging unit 2 and a collecting unit 3 having the same configuration are further arranged in a row above the charging unit 2 and the collecting unit 3. You. That is, the electric dust collector 1 of the present embodiment is a unit in which a so-called two-stage electric dust collector composed of the charging unit 2 and the collecting unit 3 is vertically stacked in two stages.

As shown in FIG. 3 and FIG.
A plurality of rectangular flat plate-shaped dust collecting electrodes 6 extending along the gas flow direction B are provided so as to face each other in a direction perpendicular to the gas flow direction B (a direction perpendicular to the plane of FIG. 3). , 6 is provided with a substantially rectangular flat discharge electrode 7 facing the dust collection electrode 6.

The dust collecting electrodes 6 and 6 arranged in the direction in which the electrodes are arranged (the horizontal direction in FIGS. 1 and 4) are
, And are bound to the end dust collecting electrodes 6X, 6X of the dust collecting electrodes 6 which are located on the outermost side in the electrode juxtaposition direction. The end dust collecting electrode 6X is a large rectangular flat plate that is common to all of the lower collecting unit 3 and the charging unit 2 and the upper collecting unit 3 and the charging unit 2.

As shown in FIG. 3, the dust collecting electrode support metal fitting 14 is inserted through the large-diameter dust collecting electrode supporting metal fitting through hole 7a formed in the discharge electrode 7, as shown in FIG. Insulation with the discharge electrode 7 is ensured. This dust collecting electrode support bracket 14
Will be described later in detail.

On the other hand, as shown in FIGS. 3 and 4, the discharge electrodes 7, 7 arranged in the
2 and 4, as shown in FIGS.
Of the end discharge electrodes 7 located at the outermost side in the electrode juxtaposition direction
X, 7X. The end discharge electrode 7X is arranged further outward than the end dust collection electrode 6X in the electrode juxtaposition direction.

As shown in FIG. 3, the discharge electrode support fitting 15 is inserted through a large diameter discharge electrode support fitting through hole 6a formed in the dust collection electrode 6, as shown in FIG. Insulation with the dust collecting electrode 6 is ensured. This discharge electrode support bracket 15
Will be described later in detail.

FIGS. 2 and 4 show the outer wall of the end discharge electrode 7X.
As shown in FIG. 5, an outwardly projecting discharge electrode bracket 7Y is formed, and on the outer wall of the end portion dust collection electrode 6X, a dust collection electrode bracket that protrudes outwardly and is disposed below and opposed to the discharge electrode bracket 7Y. 6Y are formed, and these brackets 6
An insulator 30 is provided between Y and 7Y. That is,
The end discharge electrode 7X is connected to the end dust collection electrode 6X while ensuring insulation. Thus, a collection unit electrode set is configured.

On the other hand, the charging unit 2 has substantially the same configuration as the collection unit 3, and as shown in FIGS. 1 and 3, the dust collection electrode 6, the discharge electrode 7 of the collection unit 3 and the gas flow direction B. A rectangular plate-shaped dust collecting electrode 4, a rectangular plate-shaped discharge electrode 5, and an end discharge electrode 5 of the discharge electrode 5 which is located at the outermost side in the electrode juxtaposition direction.
X is provided.

The dust collection electrode 4 is a rectangular flat plate extending in the vertical direction and commonly used by the upper and lower charging units 2 and 2.
The dust collecting electrodes 4 and 4 arranged in the direction in which the electrodes are arranged are supported by the dust collecting electrode support bracket 12 and bound to the end dust collecting electrodes 6X and 6X.

On the other hand, on the discharge electrode 5, at least the upstream end portion of the gas upstream end portion and the downstream end portion are provided with projections for generating corona discharge in parallel. The discharge electrodes 5, 5 arranged in the electrode juxtaposition direction are supported by a discharge electrode support bracket 13 as shown in FIGS. 1 and 3, and as shown in FIGS. 1 and 2,
It is bound to the end discharge electrodes 5X, 5X. Electrode support bracket 1
As shown in FIG. 3, the dust collection electrode 4 is inserted through the through hole 4 a for the discharge electrode support bracket, thereby securing insulation from the dust collection electrode 4.

Then, as shown in FIGS. 1 and 2, the discharge electrode bracket 5Y formed on the outer wall of the end discharge electrode 5X and the lower end of the end dust collection electrode 6X opposed to the discharge electrode bracket 5Y are formed. By mounting the insulator 31 between the dust collecting electrode bracket 6Z and the dust collecting electrode bracket 6Z, the end discharge electrode 5X is connected to the end dust collecting electrode 6X while ensuring insulation.
Thus, a charging unit electrode set is formed.

As described above, the upper-stage charging unit electrode set, the lower-stage charging unit electrode set, and the upper-stage charging unit electrode set 6X, 6X shared by the upper and lower charging units 2 and the collecting unit 3 are used. The collecting part electrode set and the lower collecting part electrode set, that is, the entire electrode set are supported.

Further, as shown in FIG. 3, the dust collecting electrode 4 of the charging unit 2 and the dust collecting electrode 6 of the collecting unit 3 are respectively grounded, and the discharging electrode 5 of the charging unit 2 and the discharging electrode of the collecting unit 3 are respectively. 7 is connected to high-voltage DC power supplies 10 and 11 respectively, and a negative high-voltage DC voltage (a positive high-voltage DC voltage may be used but is assumed to be negative for the sake of explanation) is applied to each. As a result, corona discharge occurs between the collection electrode 4 and the discharge electrode 5 in the charging unit 2, and an electrostatic field is formed between the collection electrode 6 and the discharge electrode 7 in the collection unit 3.

In this embodiment, the high-voltage DC power supply 11
Is higher than the high-voltage DC power supply 10, and the potential of the collection unit 3 is higher than that of the charging unit 2. However, the voltage may be opposite to the above, or may be the same. Although the high-voltage DC power supply has two power supplies, depending on the plate size and discharge characteristics,
It may be a power supply.

The area between the end dust collecting electrodes 6X, 6X is
The charging unit 2 has a substantial charging area, and the collecting unit 3 has a substantial collecting area.
An inlet introduction path for introducing gas is provided between the end dust collecting electrodes 6X, 6X of the charging unit 2, and the end dust collecting electrodes of the charging unit 2 and the collecting unit 3 are provided downstream of the collecting units 3, 3. An outlet discharge path is provided to guide the gas passing between 6X and 6X backward.

Here, the dust collecting electrode support bracket 14 of the collecting section 3 will be described in detail. As shown in FIG. 5 (a), the dust collecting electrode support member 14 is arranged coaxially with the dust collecting electrode supporting metal through hole 6e formed in the dust collecting electrode 6, and the dust collecting electrode 6, 6 is connected to each other. A stepped collar 50 having a substantially cylindrical shape disposed therebetween, a tie rod 51 for a dust collecting electrode disposed coaxially with the stepped collar 50 and passing through the stepped collar 50, and a tie rod 51 for the dust collecting electrode Screws 51 formed at both ends of the
a, and nuts 52 and 53 for a dust collecting electrode support fitting screwed to a. The inner nut 52 constituting the double nut is for tightening the tie rod 51 for the dust collection electrode, and the outer nut 53 is for preventing slack.

The stepped collar 50 is shown in FIGS.
As shown in FIG. 5, one end (right side in the figure) has a step 50a having a smaller diameter than the main body on the outer peripheral surface of the end.
a is inserted into the through hole 6e for the dust collecting electrode support bracket. Then, by tightening the nut 52 for the dust collection electrode support bracket, the end face 50c of the stepped portion 50a of the one stepped collar 50 and the stepped portion 50a of the other stepped collar 50 arranged side by side in the electrode juxtaposition direction. The end face 50d of the opposite end is pressed against the end face 50d, whereby the dust collection electrode 6 is separated from the face 50e perpendicular to the axial direction forming the step of the step 50a of the one stepped collar 50 and the other stepped collar. 50 steps 50a
The dust collecting electrodes 6 which are held in a narrow pressure by the end face 50d on the side opposite to the end and are arranged in the electrode juxtaposition direction are bound to the end dust collecting poles 6X, 6X via the stepped collar 50.

Here, in the present embodiment, the dust collecting electrode 6
Before the pressure is reduced, the thickness of the dust collecting electrode 6 is set between the surface 50e perpendicular to the axial direction forming the step of the step 50a of the stepped collar 50 and the end face 50c of the step 50a. 0.01 mm or more from the axial length L (see FIG. 6)
It is set to be 0.02 mm longer.

Therefore, the interference with respect to the dust collecting electrode 6 is the same for all the stepped collars 50 and is 0.01 mm to 0.0 mm.
2 mm. As a result, the dust collection electrode 6 is not deformed without distortion, the intervals between the dust collection electrodes 6 and 6 are made equal, and the dust collection electrode 6 vibrates even when exposed to a high-speed gas flow. There is no. If the length is longer than 0.02 mm, the dust collecting electrode 6 tends to be distorted, and 0.01 mm
It is impossible to make the length shorter in view of the thickness intersection of the electrode material and the manufacturing accuracy of the stepped collar 50.

As described above, the stepped collar 5 having a simple structure is used.
Only by using 0, the interference of each stepped collar 50 with respect to the dust collecting electrode 6 is made the same, so that the assembly is easy and the manufacturing cost can be reduced.

Further, the dust collecting electrode support fitting 14 is provided with a co-rotation preventing means 80 for preventing the dust collecting pole tie rod 51 from rotating together with the dust collecting pole supporting metal nut 52 when the nut 52 is screwed. This co-rotation preventing means 80 is provided in FIG.
As shown in (b), one end dust collecting electrode (left side in the figure) 6
X is provided with a square hole 6s through which the dust collecting electrode tie rod 51 is inserted, and a square shaft portion 51b of the dust collecting electrode tie rod 51 inserted into the square hole 6s.

The co-rotation preventing means 80 will be described in more detail. In order to obtain the binding structure of the dust collecting electrode 6 by the dust collecting electrode support 14, first, one end of the dust collecting electrode 6 </ b> X
The tie rod 51 for the dust collection electrode is inserted into the tie rod 51, the stepped collar 50 is inserted into the tie rod 51 for the dust collection electrode, then the dust collection electrode 6 is inserted. Although the discharge electrode 7 is actually arranged between the dust collecting electrodes 6 and 6, the description is omitted here. Then, the nuts 52, 52 for the dust collecting electrode support brackets on both sides are screwed into the screws 51a, 51a of the tie rod 51 for the dust collecting electrode. 51 rotate together, and a torsional force is applied to the dust collecting electrode 6 via the stepped collar 50. Here, since the dust collecting electrode 6 (the discharge electrode 7 of the collection unit 3 and the dust collection electrode 4 and the discharge electrode 5 of the charging unit 2 are also thin), when this torsional force is applied,
It will undulate. When it undulates like this,
The distance between the discharge electrode 7 and the facing discharge electrode 7 is greatly different, the charging becomes unstable, and the dust collection performance is reduced.

However, in this embodiment, the co-rotation preventing means 80, which includes the square hole 6s of the end dust collecting electrode 6X and the square shaft portion 51b of the dust collecting electrode tie rod 51, allows the dust collecting electrode tie rod 51 to be shared. Rotation is prevented. For this reason,
There is no wavy deformation of the dust collecting electrode 6 due to the application of the torsional force.

On the other hand, the discharge electrode support bracket 15 of the collecting section 3 is also
The configuration is the same as that of the dust collecting electrode support bracket 14. That is, as shown in FIG. 7, a substantially cylindrical stepped collar which is arranged coaxially with the through-hole 7e for the discharge electrode support metal formed in the discharge electrode 7 and disposed between the discharge electrodes 7, 7 is provided. 60,
A discharge electrode tie rod 61 disposed coaxially with the stepped collar 60 and penetrating the stepped collar 60;
Discharge electrode support metal fitting nuts 62 and 63 screwed into screws 61a formed at both ends of the discharge electrode tie rod 61.
And.

The stepped collar 60 is attached to the dust collecting electrode support bracket 14.
And a step portion 60a similar to that in the case of
Are inserted and arranged in the through hole 7e for the discharge electrode support fitting. The thickness of the discharge electrode 7 is, between the end surface of the stepped portion 60a and the surface perpendicular to the axial direction forming the step of the stepped portion 60a of the stepped collar 60 in a state before the discharge electrode 7 is narrowed. Since the length is set to be 0.01 mm to 0.02 mm longer than the length in the axial direction, when the discharge electrode support bracket nut 62 is tightened, the tightening allowance for the discharge electrode 7 is the same for all the stepped collars 60, and is 0.01 mm to 0.02 mm. 0.02 mm. As a result, the discharge electrode 7 is not deformed without distortion, the intervals between the discharge electrodes 7 are the same, and the discharge electrode 7 does not vibrate even when exposed to the high-speed gas flow.

Also, with respect to the discharge electrode supporting bracket 15, a square hole 7s provided at one end discharge electrode (left side in the drawing) 7X and through which a discharge electrode tie rod 61 is inserted, and a square hole 7s Square shaft part 6 of tie rod 61 for discharge electrode to be inserted
1b, and a co-rotation preventing means 81 for preventing co-rotation of the discharge electrode tie rod 61 when the discharge electrode support bracket nut 62 is screwed is provided. This co-rotation preventing means 81
Thereby, the co-rotation of the discharge electrode tie rod 61 is prevented,
There is no wavy deformation of the discharge electrode 7 due to the application of the torsional force.

The dust collecting electrode support bracket 12 of the charging unit 3 is
The collecting electrode 3 has the same configuration as the dust collecting electrode support 14, and the charging section 3 has the discharge electrode supporting metal 13 similar to the discharging electrode support 15.

Next, the operation of the thus-configured electric dust collecting apparatus 1 will be described. When driving starts,
Corona discharge occurs between the collection electrode 4 and the discharge electrode 5 in the charging unit 2, and an electrostatic field is formed between the collection electrode 6 and the discharge electrode 7 in the collection unit 3.

The particulate matter in the gas passes through the charging section 2 to be given a charge (negative ion). At this time, the dust collection electrode 4 and the discharge electrode 5 have no deformation due to the distortion, and the dust collection electrode 4 and the discharge electrode 5 have a high-speed gas flow (9 m
/ S or more), and the dust collection electrode 4 and the discharge electrode 5 do not have wavy deformation due to the application of torsional force, so that stable charging is performed and the particulate matter is efficiently charged. Is done.

The efficiently charged particulate matter enters the collecting section 3 at the subsequent stage and is collected by the dust collecting electrode 6 by the action of the electrostatic field. At this time, similarly to the charging unit 2, the dust collection electrode 6 and the discharge electrode 7 do not deform due to distortion, and the dust collection electrode 6 and the discharge electrode 7 do not vibrate due to the flowing high-speed gas flow. Furthermore, since the dust collecting electrode 6 and the discharge electrode 7 do not have a wavy deformation due to the application of the torsional force, stable charging is performed, and the particulate matter is efficiently collected. As a result, a desired dust collection performance can be obtained.

In addition, since the dust collecting electrodes 4 and 6 and the discharge electrodes 5 and 7 are not distorted in this way, for example, a tunnel fire or the like occurs and the electric dust collecting apparatus 1 is exposed to a high temperature operation (about 90 °). Even if the dust collecting electrodes 4 and 6 and the discharge electrodes 5 and 7 are thermally deformed at that time, when they return to the normal temperature state, they are restored without residual distortion. Therefore, deformation due to heat can be prevented, and the reliability of the device can be improved.

FIG. 8 is a detailed sectional view showing a dust collecting electrode supporting bracket in a collecting portion of the electric dust collecting apparatus according to the second embodiment together with a dust collecting electrode and a discharge electrode, and FIG. (B) is a sectional view of the tie rod along the line FF of (a). Here, the dust collecting electrode support fitting 14 of the collection unit 3 will be described as a representative, but the discharge electrode support fitting 15 of the collection unit 3, the dust collection electrode support fitting 12 of the charging unit 2, and the discharge electrode support fitting 13 is exactly the same.

The difference between the electrostatic precipitator of the second embodiment and that of the first embodiment is that the electric precipitator has a square hole 6s and a square shaft 51b.
Instead of the co-rotation preventing means 80, a tool hook portion formed of a flat portion formed on a part of the dust collecting electrode tie rod 51 and capable of sandwiching the dust collecting electrode tie rod 51 with a tool such as a wrench. The point is that co-rotation prevention means 82 composed of 51c, 51c and an outer nut 53 constituting a double nut is used.

Using the co-rotation preventing means 82, the dust collecting electrode 6
In order to obtain the binding structure of (1), first, the tie rod 51 for the dust collection electrode is inserted into the one end dust collection electrode 6X, and then the tool hooks 51c, 5 of the tie rod 51 for the dust collection electrode are inserted.
1c is pinched by a tool and the rotation thereof is restrained so that one side of the tie rod 51 for the dust collection electrode (one end of the tie rod 6X
Side), the nut 52 for the collecting electrode support is tightened to fix the tie rod 51 for the collecting electrode to the dust collecting electrode 6X at one end, and the nut 53 for the collecting electrode support is tightened to form a double nut. The tie rods 51 for the dust collecting electrode are prevented from rotating together. Thereafter, the stepped collar 50 is inserted into the dust collecting electrode tie rod 51, then the dust collecting electrode 6 is inserted, and this operation is sequentially repeated to temporarily assemble the electrode set. The nut 52 for the dust collecting electrode support bracket on the other side is tightened. At this time, since the nuts 52 and 53 for the dust collecting electrode support bracket on one side of the tie rod 51 for the dust collecting electrode are double nuts, the tie rod 51 for the dust collecting electrode does not rotate together. Then, the nut 53 for the dust collecting electrode support bracket on the other side of the dust collecting electrode tie rod 51 is further tightened to prevent loosening.

Also in the second embodiment, it is possible to prevent waving deformation of the dust collecting electrode 6 due to the application of the torsional force.

As described above, the present invention has been specifically described based on the embodiment. However, the present invention is not limited to the above-described embodiment, and the co-rotation preventing means is the same as that of the first and second embodiments. It is not limited.

In the above embodiment, the charging unit 2
Although the collecting unit 3 is vertically stacked in two stages, the present invention can of course be applied to an electrostatic precipitator having three or more stacked units or one stage.

In the above embodiment, the charging unit 2
And two-stage type with a trapping unit 3 (meaning two stages in the gas flow direction)
Is applied to the so-called one-stage type electrostatic precipitator which also serves as the charging unit 2 and the collecting unit 3. Can be applied to the dust collection electrode of an electric precipitator with a flat plate and the discharge electrode as a wire discharge electrode.

Furthermore, in the above-described embodiment, the electric precipitator is an electric precipitator for a tunnel because it is particularly effective to apply the present invention to a tunnel in which a high tunnel ventilation flow rate is required. It can also be adopted as an air purifier or for removing exhaust dust from a diesel engine.

[0057]

According to the electrostatic precipitator of the present invention, the narrowing of the pressure is maintained by the stepped collars so that the interference with the electrode is the same, the deformation caused by the distortion of the electrode is eliminated, and the electrode vibrates during operation. , Stable charge can be secured and desired dust collection performance can be obtained. In addition, by eliminating the distortion of the electrode in this way, even if the electrode is thermally deformed at that time due to abnormally high temperature, it will be restored without residual distortion if it returns to the normal temperature state, preventing deformation due to heat and improving the reliability of the device It becomes possible to do. further,
The same interference with the electrodes is performed using the stepped collar to facilitate the assembly, so that the manufacturing cost can be reduced.

[Brief description of the drawings]

FIG. 1 is a front view showing an electrostatic precipitator according to a first embodiment, and is a front view mainly showing a charging section.

FIG. 2 is a sectional view taken along line AA of FIG.

FIG. 3 is a sectional view taken along line CC of FIG. 1;

FIG. 4 is a cross-sectional view taken along the line DD of FIG. 2 and is a cross-sectional view mainly showing a trapping portion.

5A and 5B are detailed cross-sectional views showing a dust collecting electrode support bracket in the collecting unit of FIG. 4 together with a dust collecting electrode and a discharge electrode, wherein FIG. 5A is a longitudinal cross-sectional view, and FIG. It is sectional drawing which follows the E line.

FIG. 6 is a longitudinal sectional view showing the stepped collar of FIG. 5;

FIG. 7 is a detailed cross-sectional view showing a discharge electrode support bracket in the collection unit of FIG. 4 together with a discharge electrode and a dust collection electrode.

FIG. 8 is a detailed sectional view showing a dust collecting electrode support bracket in a collecting unit of the electric dust collecting apparatus according to the second embodiment together with a dust collecting electrode and a discharge electrode, (a) being a longitudinal sectional view, and (b) being a longitudinal sectional view; ) Is FF of (a)
It is sectional drawing of a tie rod along a line.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Electric dust collector for tunnels (Electric dust collector), 2 ... Charging part, 3 ... Collection part, 4 ... Dust collection electrode of charging part, 5 ... Electrode discharge electrode of charging part, 5X, 7X ... End discharge Electrode (end electrode), 6: Dust collecting electrode of collection part, 6e: Through hole for dust collecting electrode support bracket, 6X ...
End dust collecting electrode (end electrode), 7 ... Discharge electrode of collector, 7e ...
Through-holes for discharge electrode support fittings, 12, 14 ... dust collection electrode support fittings, 13, 15 ... discharge electrode support fittings, 50, 60 ... stepped collars, 50a, 60a ... stepped portions of stepped collars, 50
c: end face of the step portion of the stepped collar; 50d: end face of the end opposite to the step portion of the stepped collar; 50e: surface orthogonal to the axial direction forming the step of the step portion of the stepped collar;
51, 61: Tie rod, 51a, 61a: Screw, 5
2, 53, 62, 63 ... nut, 80, 81, 82 ... co-rotation prevention means, B ... gas flow direction.

 ────────────────────────────────────────────────── ─── Continued on the front page (72) Inventor Kenji Shibata 63-30 Yuigaoka, Hiratsuka-shi, Kanagawa F-term in Hiratsuka Works of Sumitomo Heavy Industries, Ltd. 4D054 AA07 BA02 BB05 BB26 BC03 BC34 BC36 BC37 BC38

Claims (3)

[Claims] 1. An electrostatic precipitator in which flat electrodes extending in a flow direction of an inflowing gas are arranged in parallel with the same poles facing each other in a direction orthogonal to the flow direction of the gas. A plurality of stepped collars disposed between the electrodes and having a step portion having a smaller diameter than the main body portion on one end outer peripheral surface are provided between the same electrodes, and the step portion of the stepped collar is formed on the electrode. The end face of the stepped portion of one stepped collar and the end of the other stepped collar which are opposite to the stepped portion of the one stepped collar which are arranged in the through hole penetrating in the axial direction and juxtaposed in the electrode juxtaposition direction. An end surface is pressed against the electrode, and the electrode is an end opposite to a surface orthogonal to an axial direction forming a step of the stepped portion of the one stepped collar and the opposite side of the stepped portion of the other stepped collar. Characterized by being held in a narrow pressure with the end face Location. 2. In a state before the electrode is narrowed, a thickness of the electrode is perpendicular to an axial direction forming a step of the step portion of the stepped collar and an end surface of the step portion. 0.01 mm to 0.02 from the axial length between
2. The electrostatic precipitator according to claim 1, wherein the length is set longer by mm. 3. The same-polarity electrode is inserted through the stepped collar through the stepped collar by inserting a screw into both ends of the stepped collar and screwing a nut to the screw. A tie rod that binds to the outermost end electrode positioned in the electrode juxtaposition direction, and co-rotation preventing means that prevents the tie rod from co-rotating when the nut is screwed. Claim 1.
The electric precipitator according to the above.