JPH04317754A - Electric dust collection apparatus - Google Patents

Abstract

PURPOSE:To inhibit the electric discharge in a tied together part of electric discharge wires without calling for a dust collecting system of a larger size. CONSTITUTION:An electric dust collection apparatus comprises electric discharge wires 1 providing the electric charge to dust particles present in the air and having both ends each of which are tied together; dust collecting electrodes 2 situated across from the electric discharge wires 1 to collect the thus electrified dust particles; and a barrier for prevention of electric shock 3 situated between the dust collecting electrodes 2 and having a protrusion for prevention of electric discharge 9 close to a tied together part 6 of the electric discharge wires 1.

Description

[Detailed description of the invention]

0001

[Field of Industrial Application] The present invention relates to an electrostatic precipitator that is capable of suppressing discharge at the tangled portion of a discharge wire in an electrostatic precipitator provided with a barrier for preventing electric shock between the collecting electrodes. be.

0002

2. Description of the Related Art An electrostatic precipitator applies a high DC voltage between a discharge wire and a dust collection electrode to collect ionized dust in the air on the dust collection electrode. That is, a discharge wire and a dust collection electrode of a conventional electrostatic precipitator will be described with reference to FIGS. 8 to 10.

FIG. 8 is a front view of the dust collecting electrode assembly. FIG. 9 is a side view taken along the line AA in FIG. 8. FIG. 10 is a schematic diagram of the internal structure of the electrostatic precipitator. 8 and 9, a dust collecting electrode assembly 22 is shown in which a plurality of dust collecting electrodes 22' made of, for example, aluminum are arranged at equal intervals. The dust collecting electrode assembly 22 can be removed from the dust collecting apparatus body 24 (see FIG. 10) in order to clean dust adhering to the dust collecting electrode 22'. That is, a dust collecting electrode handle portion 23 is provided on one side of the dust collecting electrode assembly 22 . Further, the dust collecting electrode 22' is made, for example, by cutting and raising a part of an aluminum plate at right angles, as shown in FIG.

In the dust collector main body 24 shown in FIG.
As shown in the figure, a discharge wire 21 made of, for example, tungsten is stretched in a U-shape, and both ends thereof are locked with discharge wire locking portions 25 . Dust collecting electrode fixing parts 26 and 26' are provided between the two discharge wires 21 to fix each dust collecting electrode 22' of the dust collecting electrode assembly 22.

[0005] Also, the high voltage DC power supply 27 has a ground wire 28.
and the input line 29, for example, after converting AC 100V to high voltage DC voltage, apply a (+) potential to the discharge wire 21,
A (-) potential is applied to each of the dust collecting electrodes 22'. In such an electrostatic precipitator, air or gas containing dust passes between the dust collecting electrodes 22'. Dust particles contained in the air or gas are collected by the discharge wire 21 and the dust collection electrode 22'.
It is charged to (+) due to the high DC electric field between the two.

[0006] After that, the (+) charged dust particles are
It is attracted to the dust collecting electrode 22' on the (-) side. Dust collection electrode 22
The fine dust particles sucked into ′ are gradually deposited, so
It is necessary to clean it before the adsorption efficiency deteriorates. Therefore, the dust collecting electrode assembly 22 is pulled out of the dust collecting apparatus main body 24 by the dust collecting electrode handle 23 and cleaned. The structure of these dust collector main bodies 24 is disclosed in Japanese Patent Application Laid-Open No. 63-937.
No. 97.

Next, a method for attaching the discharge wire 21 to the discharge wire locking portion 25 will be explained with reference to FIGS. 11 to 15. FIG. 11 is an explanatory diagram of installing a discharge wire using a bobbin. In FIG. 11, a view of the upper left figure viewed from above is shown in the lower left side, and the right figure is the result of pressing the bobbin in the state shown in the lower left figure.

FIG. 12 is an explanatory diagram of installing a discharge wire using a spring. FIG. 13 is an explanatory diagram of installing the discharge wire using welding. FIG. 14 is an explanatory diagram of installing a discharge wire using a tube. Figure 15
FIG. 3 is an explanatory diagram of a cut-off portion and an edge portion of a dust collecting electrode. In FIG. 11, both ends of the discharge wire 21 are connected to the bobbin 31.
A method is shown in which the bobbin 31 is wound around the bobbin 31 and the bobbin 31 is crushed from above and below as indicated by the white arrows shown in the figure.

In FIG. 12, the discharge wire 21 is tied to the ring portion 33 of the spring 32, and the tied portion 34
A method is shown for forming the . In FIG. 13, a method is shown in which the end of the discharge wire 21 is directly spot welded or crimped. In FIG. 14, a method of covering the tube 36 on the tangled portion 34 in FIG. 12 is shown.

0010

However, in the method using the bobbin 31 shown in FIG. 11, not only the cost of the bobbin 31 is expensive, but also a device and man-hours for crushing the bobbin 31 are required. The method of using the spring 32 shown in FIG. 12 is convenient when the discharge wire 21 is always kept under constant tension. However, since the distal end portion 34' of the discharge wire 21 in the barbed portion 34 is sharply pointed, there is a risk that the electric field will be concentrated at this portion and a corona discharge (streamer) will occur. Therefore, the life of the discharge wire 21 is significantly reduced at the tip 34' compared to other parts.

The method using spot welding or caulking as shown in FIG.
This eliminates the disadvantage of shortening the lifespan due to the concentration of electric fields in the area, but there is a problem with the installation strength. Further, a tube 36 covering the tangled portion 34 of the discharge wire 21 shown in FIG.
Although the method using the above has the advantage of not causing the corona discharge, there are problems with the cost of the tube 36 and the number of man-hours required to cover it.

Therefore, in order to prevent discharge from occurring from the tip 34' using the spring 32 shown in FIG. 12, as shown in FIG. Alternatively, the entire device may be enlarged so that the cutting portion 38 of the discharge wire and the edge portion 37 of the dust collecting electrode 22 are separated from each other.

With such a configuration, the discharge wire 2
1 can be stretched with a constant tension at all times, and there is little discharge from the tangled portion 34. However, on the other hand, a new drawback arises in that the device becomes larger. The present invention is intended to solve the above-mentioned problems, and aims to provide an electrostatic precipitator that can suppress discharge at the tangled portion of the discharge wire without increasing the size of the precipitator main body. purpose.

[0014]

[Means for Solving the Problems] In order to achieve the above object, the electrostatic precipitator of the present invention applies electric charge to dust particles existing in the air, and discharges a discharge whose both ends are stopped. A wire, a dust collection electrode that is provided opposite to the discharge wire and collects the charged dust particles, and an electric shock prevention device that is provided between the dust collection electrodes and is conventionally provided to prevent electric shock. In the barrier, a discharge preventing protrusion is formed close to a tangled portion where the discharge wire is tangled.

[0015]

[Operation] In the case of the present invention, the electric shock prevention barrier provided between the dust collecting electrodes is formed with discharge prevention protrusions that approach the tangled portion of the discharge wire. If a discharge prevention protrusion is present close to the tip of the tangled part of the discharge wire in this way, the potential gradient in this part becomes gentler and takes a value below the potential gradient required to start corona discharge. Become something. That is, when a discharge prevention protrusion made of an insulating member is present close to the tangled portion of the discharge wire, there is little change in potential (potential gradient) over a small distance, so that the insulation of the air is not destroyed and discharge is not caused.

[0016]

DESCRIPTION OF THE PREFERRED EMBODIMENTS An electrostatic precipitator according to the present invention will be explained with reference to FIGS. 1 and 2. FIG. 1 is an explanatory diagram of a locking portion of a discharge wire. FIG. 2 is an explanatory diagram of the arrangement of a discharge wire, a dust collection electrode, and a barrier.

The electrostatic precipitator of the present invention is basically the same as the conventional example described above. However, the difference from the conventional example of the present invention lies in that a discharge prevention protrusion is provided on the electric shock prevention barrier near the tangled portion of the discharge wire. For example, in FIGS. 1 and 2, a discharge wire 1 made of tungsten is placed between dust collection electrodes 2 made of aluminum and disposed opposite to each other. A barrier 3 for preventing electric shock made of, for example, synthetic resin is provided opposite the discharge wire 1 in order to prevent a person from coming into contact with the discharge wire 1 undesirably.

Further, the discharge wire 1 is tied to a spring 4 via a stopper 5 to form a tied part 6. The other end of the spring 4 is locked in a locking part 8 formed on the end 7 of the barrier 3. Furthermore, barrier 3
A discharge prevention protrusion 9 is formed close to the barbed portion 6 of the discharge wire 1.

The discharge phenomenon near the tangled portion 6 of the discharge wire 1 will be explained with reference to FIGS. 3, 4, 6, and 7. FIG. 3 is an explanatory diagram of the arrangement relationship among the discharge wire, the dust collection electrode, and the discharge prevention protrusion. FIG. 4 is an explanatory diagram of the potential distribution in FIG. 3. FIG. 5 is a diagram illustrating a conventional arrangement of a discharge wire, a dust collection electrode, and an electric shock prevention barrier. FIG. 6 is an explanatory diagram of the potential distribution in FIG. 5.

The difference between FIG. 3 and FIG. 5 is that in FIG. 3, a protrusion 9 for preventing discharge is formed close to the barb 6 of the discharge wire 1, whereas in FIG. 6, a protrusion 9 for preventing electric shock is formed. barrier 3
However, the discharge prevention protrusion 9 is not formed. Under this arrangement, the discharge wire 1 and the dust collection electrode 2
Figure 4 shows the potential distribution when a voltage of 5KV is applied between
and shown in FIG.

As shown in FIG. 4, when the discharge prevention protrusion 9 is provided on the barrier 3, since the barbed portion 6 of the discharge wire 1 and the discharge prevention protrusion 9 are close to each other, the potential gradient is moderated. Make it. Therefore, the potential distribution curve deviates from the corona discharge starting range. On the other hand, as shown in FIG. 6, when there is only the barrier 3 without the discharge prevention protrusion 9, the potential gradient is high. That is, since the voltage change per unit distance is large, the insulation of the air is broken and discharge occurs.

The reason why the potential gradient becomes gentler in the case of FIG. 3 is that because the discharge prevention protrusions 9 are located close to each other, the diameter of the discharge wire 1 becomes apparently larger. Conceivable. FIG. 7 is an explanatory diagram of the potential distribution between the discharge wire and the dust collection electrode in the simulation. That is, FIG. 7 shows the case of FIG. 3 and the case of FIG. This is the potential distribution between the discharge wire and the dust collecting electrode, which is the result of a computer simulation of the potential distribution.

[0023] Figure a shows a case where the discharge prevention protrusion 9 of the present invention is provided, and figure b shows a case where only the barrier 3 is provided. Comparing illustrations a and b, it can be seen that illustration a has a lower potential gradient and is less likely to cause discharge.

[0024]

According to the present invention, since the discharge prevention protrusion is formed close to the tangled portion of the discharge wire in the electric shock prevention barrier, there is no need for a discharge protection tube as shown in FIG. As shown in FIG. 15, there is no need to shorten the opposing dust collecting electrodes. Furthermore, since discharge could be prevented at the tangled portion of the discharge wire, the life of the discharge wire could be extended.

[Brief explanation of drawings]

FIG. 1 is an explanatory diagram of a locking portion of a discharge wire.

FIG. 2 is an explanatory diagram of the arrangement of a discharge wire, a dust collection electrode, and a barrier.

FIG. 3 is an explanatory diagram of the arrangement relationship of a discharge wire, a dust collection electrode, and a discharge prevention protrusion.

FIG. 4 is an explanatory diagram of potential distribution in FIG. 3;

FIG. 5 is an explanatory diagram of the arrangement relationship of a discharge wire, a dust collection electrode, and an electric shock prevention barrier.

FIG. 6 is an explanatory diagram of potential distribution in FIG. 5;

FIG. 7 is an explanatory diagram of potential distribution between a discharge wire and a dust collection electrode in simulation.

FIG. 8 is a front view of the dust collecting electrode assembly.

FIG. 9 is a side view taken along line AA in FIG. 8;

FIG. 10 is a schematic diagram of the internal structure of the electrostatic precipitator.

FIG. 11 is an explanatory diagram of installing a discharge wire using a bobbin.

FIG. 12 is an explanatory diagram of installing a discharge wire using a spring.

FIG. 13 is an explanatory diagram of installing a discharge wire using welding.

FIG. 14 is an explanatory diagram of installing a discharge wire using a tube.

FIG. 15 is an explanatory diagram of a rib portion and an edge portion of a dust collecting electrode.

[Explanation of symbols]

1 Discharge wire 2 Dust collection electrode 3　Electric shock prevention barrier 4 Spring 5 Fasteners 6 Karaage part 7 End part 8 Locking part 9 Discharge prevention protrusion

Claims (1)

[Claims] 1. A discharge wire that applies an electric charge to dust particles existing in the air and is secured at both ends, and a discharge wire that is provided opposite to the discharge wire to collect the charged dust particles. A dust collection electrode, and an electric shock prevention barrier provided between the dust collection electrodes and having a discharge prevention protrusion formed close to a barbed portion where the discharge wire is secured. Characteristic electrostatic precipitator.