JPS61257253A - Discharging device - Google Patents

Abstract

PURPOSE:To uniformly discharge between respective discharge gaps and to decrease the consumption of electric power by providing an intermediate electrode on a line joining the discharge parts of both impression electrodes while keeping some intervals from these electrodes. CONSTITUTION:In a discharging device forming uniformly the discharge with each discharge gap, plural impression electrodes 1 are parallelly arranged on an electrode-holding frame 4 and the intermediate electrodes 2 are provided on the lines joining the tip parts of the impression electrodes 1 and also both impression electrodes 1 and the intermediate electrodes 2 and respective intermediate electrodes 2 are separated while keeping the prescribed intervals. In such a way, the uniform discharge fields can be formed between respective impression electrodes without using an electric resistor and the volume efficiency of the device is increased and the miniaturization of the device is attained and the consumption of the electric power is decreased.

Description

DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a discharge device, and more particularly to a discharge device capable of uniformly forming a discharge in each discharge gap.

2. Description of the Related Art Discharge devices have been used in various fields. For example, a discharge device is incorporated in an electrostatic precipitator or an ozone generator that removes dust from waste gas. In recent years, in addition to these fields, electric discharge devices are being applied in the fields of sterilization and deodorization by taking advantage of the various characteristics of electric discharge.

In this type of discharge device, an unequal electric field is formed between electrodes like needle-to-flat or needle-to-needle, and corona discharge, glow discharge, arc discharge, or spark discharge is generated by appropriately setting discharge conditions. There is. No matter which type of discharge is employed, discharge itself is an unstable phenomenon, so in industrial-scale devices, a desired discharge field is formed by using a plurality of pairs of electrodes. In this case, if each electrode is directly connected to a power source, it is not easy to discharge evenly in each discharge gap because the state of the fluid to be treated in each discharge gap is not necessarily uniform or because the discharge gap length is slightly different. Furthermore, there is a risk that the current will suddenly and rapidly increase due to discharge, which may damage the electrodes. For this reason, in conventional devices, an electric resistor is interposed in the circuit connecting the electrode and the power source (for example, Japanese Patent Publication No. 54-23147). Since an electrical resistor is usually provided for each electrode, as the number of electrodes used increases, it is necessary to use a corresponding number of electrical resistors. Further, during discharging, power is consumed by these electrical resistors, but there is also a problem in that all of this electrical energy is dissipated as heat and does not contribute to the discharging at all.

Summary of the Invention The present invention overcomes the drawbacks of the prior art, and includes:
The present invention provides a discharge device that achieves the role of the electric resistor used in the prior art by arranging discharge gaps in series, allows uniform discharge between the discharge gaps, and consumes less power. That is, the present invention provides application electrodes to which a voltage is applied and arranged to face each other, and an intermediate electrode located on a line connecting the discharge portions of the two application electrodes and arranged between these electrodes at a distance from these electrodes. This is a discharge device that is connected to an electrode.

Preferred embodiments of the invention Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

FIG. 1 is a configuration diagram showing an example of the present invention.

The electrode support frame 4 has application electrodes 1 on the left and right sides, respectively.
are arranged in parallel, four each. The application electrodes 1 located on the same horizontal plane are arranged so that their pointed ends face each other, and the intermediate electrode 2 is installed on the line connecting these pointed ends, and the application electrode 1 and the intermediate electrode 2 as well as each intermediate electrode 2 are They are separated by a predetermined interval.

The application electrode 1 is preferably a needle-shaped electrode, but a citron plate electrode or a rod-shaped electrode can also be used. For needle-like electrodes, the tips are arranged opposite to each other, for flat electrodes, the ends are arranged opposite to each other, and for rod-like electrodes, the length direction is opposite to each other. As the material of the application electrode 1, conventionally known conductive materials such as iron, aluminum, and tungsten can be used.

Although various shapes and materials can be used for the intermediate electrode 2 as described above, a needle-shaped electrode is preferable. This intermediate electrode enables uniform discharge in each discharge gap. Here, the discharge gap length is a value obtained by subtracting the length of the intermediate electrode 2 from the length from the tip of the application electrode 1 on the left side to the tip of the application electrode 1 on the right side. That is, the discharge gap length l is ノ=right+lz''Is (in the formula, l□, lz, and its each indicate the distance between the electrodes as shown in the figure).In the conventional device, the distance between the two application electrodes is The length corresponds to l, but in the device according to the present invention, ! is divided by interposing the intermediate electrode 2. In the figure, l is divided into three parts. Generally speaking, they are located on the same horizontal line. If the number of intermediate electrodes is n, then n+1
divided into. 1l-1x-Is may be equidistant or different. However, the most stable and uniform discharge is formed when 1x=lt=ls.

The length of the intermediate electrode 2 can be selected as appropriate. It is preferable that the intermediate electrode 2 is movable left and right on the support frame 4 so that fine adjustment of the right *12m1B can be performed.

The discharge characteristics are affected by the discharge gap length, the electrode surface shape, the state of the gas to be treated between the discharge gaps, etc. Conventional devices are directly affected by these effects, and therefore have the disadvantage that the gap that is most likely to discharge is selectively discharged due to a slight difference in the discharge gap length between each discharge gap or a slight difference in the gas atmosphere to be processed. . In the device according to the present invention, since the discharge gap length l is divided, the influence on the discharge occurring at 11-1t-Im is reduced or canceled out, and uniform discharge is made possible at each discharge gap length l. For example, considering a discharge at l, (assuming that a desired discharge is formed at 1,,1,), the inter-electrode distance 11 here is the total discharge inter-electrode distance and the treated object within this discharge gap. The same holds true for l, the influence of each fluid on the discharge. From this point of view, it can be said that the more intermediate electrodes are used, the more uniform discharge can be performed in each column. However, since j is generally 1 to 5 crIL, if n is too large, l, 1. ．． 13 becomes smaller, and it is necessary to improve accuracy in manufacturing the device. Therefore, n=2
~5 is preferred.

The voltage applied from the power source 3 to the application electrode 1 may be alternating current or direct current. Various voltages can be selected depending on the desired discharge format described later, but preferably the discharge gap length l
It is 0.7 kv/lnw or more per standard length.

The longer l is, the higher the required voltage is, and the greater the number of electrodes connected in parallel, the greater the current required.

In the apparatus of the present invention, corona discharge, spark discharge, glow discharge, arc discharge, etc. can be generated, but glow discharge is particularly preferred. Since glow discharge is a form of self-sustaining discharge, the characteristics of the present invention can be fully exhibited. On the other hand, even in arc discharge or spark discharge, uniform discharge is possible according to the present invention.

Effects of the Invention As described above, in the present invention, by dividing the discharge gap with intermediate electrodes, a uniform discharge field can be created between each application electrode arranged in parallel without using a conventional electrical resistor. can be formed. Thereby, the volumetric efficiency of the device can be increased, and the device can be made smaller. Furthermore, since there is no need to use an electrical resistor, most of the power consumed during discharging contributes to discharging, thereby increasing energy efficiency. Furthermore, by making the intermediate electrode movable as appropriate, 111+12+
Another advantage is that the conditions for uniform discharge can be easily set by finely adjusting l.

EXAMPLE The discharge characteristics were investigated using the discharge device shown in FIG. The specifications and discharge conditions of this device are as follows.

Number of series gaps: 6 each Number of parallel gaps: 7 each Gap length: 5 total gap length: 15 Dragon electrode material: tungsten Applied voltage 2 AC 15 kV Total discharge current: 25 mA Discharge was performed by allowing air to flow into this device. As a result, it was confirmed that discharge occurred in all discharge gaps.

[Brief explanation of drawings]

FIG. 1 is a block diagram of an apparatus according to the present invention. FIG. 2 is a configuration diagram of the discharge device used in the example. 1... Application electrode 2... Intermediate electrode 3... High voltage power supply 4... Electrode support frame patent applicant Shinryo Corporation (5 others) Figure 1 Figure 2

Claims (1)

[Scope of Claims] 1) Application electrodes to which a voltage is applied and arranged to face each other, and an electrode located on a line connecting the discharge portions of both application electrodes, and having a distance between these electrodes from these electrodes. A discharge device consisting of an intermediate electrode arranged in such a manner that 2) The discharge device according to claim 1, wherein the application electrode and the intermediate electrode are needle-shaped electrodes. 3) The discharge device according to claim 2, wherein a plurality of intermediate electrodes are provided, and at least one end of each intermediate electrode is located so as to face an adjacent intermediate electrode. 4) The discharge device according to any one of claims 1 to 3, which performs glow discharge.