JPH0141491Y2 - - Google Patents

Description

[Detailed description of the invention] The present invention relates to a multi-point conduction type rotary spark gap device, and more particularly to a multi-point conduction type rotary spark gap device that can be applied to a pulsed high voltage generator for an electrostatic precipitator. .

It is generally known that when an electrostatic precipitator is charged with a pulsed high voltage, the distribution of corona discharge becomes uniform and the dust collection performance can be significantly improved.
In this case, one of the switches used in this pulse high voltage generation circuit is a rotary spark gap (RSG).
). For example, the outline is shown below. In FIGS. 1A and 1B, shafts 2 are screwed into two discharge bulbs 1, and are insulated and supported from an underframe 8 by an insulator 3. A cigar-shaped rotor 4 is located between this discharge bulb 1.
There is a shaft 5 passing through the center, and a bearing 6
The structure is such that it can be rotated by an electric motor 7 while maintaining a gap of several mm between the rotor 4 and the ball 1.

For example, a half-wave rectified DC high voltage Vin as shown in FIG. If the rotor 4 is rotated, a flash will occur at point P due to spark discharge, and the input side 9
Voltage V is shown in figure B, and output side 10 voltage V _OUT is shown in figure C.
As a result, a pulsed high voltage can be obtained.

However, when using this conventional RSG, one pulsed high voltage generator and one pulsed high voltage generator for each charging section of several sections per electrostatic precipitator.
This requires an RSG, which is very disadvantageous in terms of cost and has the disadvantage of increasing the probability of failure.

This invention was proposed in view of the above circumstances, and its purpose is to be able to perform pulse charging on multiple charging sections with one RSG, as well as to reduce the failure rate and cost. An object of the present invention is to provide a multi-point conduction type rotary spark gap device that can achieve the following.

In the multi-point conduction type rotary spark gap device according to the present invention, one electrode of each pair of electrodes facing each other is connected to a DC high voltage generator, and each other electrode is connected to n charged sections. 2n discharge bulbs respectively arranged at each vertex of a regular 2u square connected to each charging electrode in each charging section of an electrostatic precipitator having a and a rotor that generates a spark discharge between each pair of discharge bulbs facing each other by rotation, and one RSG is capable of pulse charging a plurality of charging sections. It is designed to overcome the drawbacks of the conventional method.

An embodiment of the present invention will be described in detail based on the drawings.

FIG. 3 is a plan view showing the configuration of an embodiment of the present invention, and FIGS. 4A, B, C, and D are diagrams showing input and output waveforms of the embodiment shown in FIG. 3, respectively.

In Fig. 3, 11 is a discharge lamp, 12 is a rotor drive shaft, 13 is an input lead wire, 14, 15, 16
1 is an output lead wire, 17 is an insulator, and 18 is a rotor.

One embodiment of the present invention shown in FIG.
In this example, the number of discharge bulbs 11, which was conventionally two, is increased to six, and these are arranged at each vertex of a regular hexagon centered on the rotor drive shaft 12.
In general, if the number of charge divisions is n and the primary power frequency of a DC power source is 2n, each of 2n discharge bulbs 11 is
By placing the rotor 18 at each vertex of the rectangle and rotating the rotor 18 at N (rpm) at the center, pulse charging to n sections is possible.

However, N = /2n (rps) = 30 / n (rpm) When n becomes large, it is necessary to ensure a distance between each discharge bulb that will not cause sparks, but due to reasons such as the capacity of the power supply device, n may not be large enough. It is up to about 4 and there are no particular problems. The discharge bulb 11 is supported by a shaft supported by an insulator 17 as in the conventional type. The rotor drive shaft 12 drives, for example, an electric motor by decelerating it using a gear or the like. The input lead wires 13 are collectively connected to a DC high voltage generator (not shown), and the output lead wires 14 to 16 are respectively connected to each charging electrode (not shown) of each charging section of the electrostatic precipitator. .

The operation of the embodiment of the present invention described above will be explained.

A half-wave rectified DC high voltage as shown in FIG. 4A is applied to the input lead wire 13. Now, in order to bring the rotor 18 closest to the discharge bulb 11 at point P, change the primary power frequency (=1/T) x 1/6 of the DC power supply.
(rps), a spark discharge occurs at each point P, and the pulsed high voltages shown in FIGS. 4B, C, and D can be sequentially applied to each of the three charged sections. (V ₁₄ , V ₁₅ , and V ₁₆ correspond to each output lead wire 14 to 16, respectively).

In this case, for example, the primary power frequency of the DC power source and the rotor rotation speed may be synchronized by decelerating an electric motor that rotates in synchronization with the power frequency using a gear or the like.

As described above, according to the present invention, one RSG can perform pulse charging on a plurality of charging sections, so that the voltage applied to each charging section can be controlled all at once.
In addition, due to the decrease in the rotor rotation speed due to the increase in the number of charged sections, the pulse repetition period (T' in Figure 4B)
becomes longer. Thereby, the corona discharge current of the electrostatic precipitator is reduced, and a decrease in dust collection efficiency due to the occurrence of reverse ionization can be suppressed. This effect becomes noticeable when the electrical resistivity of the dust is high. Furthermore, the number of RSG and DC high voltage generator is 1 each.
This provides excellent effects such as requiring only one piece and making it possible to reduce costs.

[Brief explanation of drawings]

Figures 1A and 1B are diagrams showing the configuration of a conventional RSG.
Figure 1A is a plan view, Figure 1B is a front view, Figures 2A, B, and C are diagrams showing input and output waveforms of conventional RSG.
FIG. 3 is a plan view showing the configuration of an embodiment of the present invention;
4A, B, C, and D are diagrams showing input and output waveforms of the embodiment shown in FIG. 3, respectively. 11... Discharge bulb, 12... Rotor drive shaft, 13
...Input lead wire, 14,15,16...Output lead wire, 17...Insulator, 18...Rotor.

Claims (1)

[Scope of utility model registration request] Each one of each pair of electrodes facing each other is connected to a DC high voltage generator, and each other electrode is connected to each of the charged sections of an electrostatic precipitator having n charged sections. 2n placed at each vertex of a regular 2n square connected to each charge electrode
multi-point conduction, comprising: a plurality of discharge bulbs; and a rotor that is provided at the center of the regular 2n square and generates a spark discharge between each pair of discharge bulbs that rotate to face each other. Type rotary spark gap device.