JP2010182455A - Discharge reactor - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To protect a power supply circuit or the like by preventing a high voltage side electrode and a ground electrode from being mutually short-circuited even when the electrodes fuse owing to abnormal discharge. <P>SOLUTION: The discharge reactor 10 includes the ground electrode 12, the high voltage side electrode 14, and a power supply circuit 16. A fusible part 18 which fuses in its early stage compared with its surrounding locations is provided in the high voltage side electrode 14. The length L of an electrode piece 14B positioned between the fusible part 18 and a power supply connecting part 14A is set to be shorter than the interelectrode distance between the high voltage side electrode 14 and the ground electrode 12. Thereby, when abnormal discharge such as arc discharge occurs, the high voltage side electrode 14 can be fused at the position of the fusible part 18. As a result, even when the high voltage side electrode 14 is fused, the electrode piece 14B connected to the power supply circuit 16 side can be prevented from being short-circuited to the ground electrode 12, and the power supply circuit 16 can be protected. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to a discharge reactor suitably used for generating ozone, plasma, and the like by discharge between electrodes.

  As a conventional technique, for example, as disclosed in Patent Document 1 (Japanese Patent Laid-Open No. 2002-274814), an ozone generator that generates ozone by applying a pulse voltage to a discharge tube is known. This type of prior art ozone generator comprises a ground electrode provided along the inner peripheral surface of a cylindrical discharge tube, and a wire-like high-voltage side electrode arranged along the central axis of the discharge tube. I have. When the ozone generator is in operation, a high voltage pulse generated by the power supply circuit is applied to the high voltage side electrode, and a discharge is generated between the high voltage side electrode and the ground electrode. Oxygen in the air introduced into the discharge tube is ozonized by this discharge, so that ozone can be obtained.

JP 2002-274814 A

  By the way, in the prior art mentioned above, when generating ozone, it is preferable that discharge generate | occur | produces equally in each location between electrodes. However, in practice, discharge may be locally biased and abnormal discharge such as arc discharge may occur. When abnormal discharge occurs, there is a possibility that a part of the electrodes melts due to local current concentration and the two electrodes are short-circuited.

  The present invention was made in order to solve the above-described problems, and the object of the present invention is to prevent the high-voltage side electrode and the ground electrode from short-circuiting even when the electrode is melted due to abnormal discharge, An object of the present invention is to provide a discharge reactor capable of protecting a power supply circuit and the like.

The first invention comprises a ground electrode formed in a cylindrical shape,
A high-voltage side electrode disposed on an inner peripheral side of the ground electrode, extending in the axial direction in a state of being opposed to the ground electrode with a predetermined distance between the electrodes, and having a power supply connection portion provided on an end side in the axial direction; ,
A power supply means connected to a power supply connecting portion of the high-voltage side electrode, and applying a voltage between the high-voltage side electrode and the ground electrode;
It is formed by a part of the high-voltage side electrode, and is disposed at a position where the distance between the power supply connection portion is shorter than the distance between the electrodes, and when a larger current flows than normal, A fusing part that blows out early,
It is characterized by providing.

The second invention comprises a ground electrode formed in a cylindrical shape,
A high-voltage side electrode disposed on an inner peripheral side of the ground electrode, extending in the axial direction in a state of being opposed to the ground electrode with a predetermined distance between the electrodes, and having a power supply connection portion provided on an end side in the axial direction; ,
A power supply means connected to the power supply connecting portion of the high-voltage side electrode, and applying a voltage between the high-voltage side electrode and the ground electrode;
It is formed by a part of the high-voltage side electrode, and is disposed at a position where the distance between the power supply connection portion is equal to or more than the distance between the electrodes, and more than the surrounding region when a larger current flows than usual. A fusing part that blows out early,
An insulator that is provided on the inner peripheral side of the ground electrode, and prevents the high-voltage side electrode from coming into contact with the ground electrode when the melted portion of the high-voltage side electrode is melted;
It is characterized by providing.

  According to a third aspect of the invention, the high-voltage side electrode is formed with a narrow portion that is narrower than the surrounding portion, and the melted portion is constituted by the narrow portion.

  According to the fourth aspect of the invention, the high voltage side electrode is formed with a low melting point portion made of a material having a melting point lower than that of the surrounding portion, and the low melting point portion constitutes the fusing portion.

  According to the first invention, when abnormal discharge such as arc discharge occurs, the fusing position of the high-voltage side electrode can be appropriately determined by the fusing part. That is, the fusing part can make the length of the part connected to the power supply means side of the blown high-voltage side electrode shorter than the inter-electrode distance between the high-voltage side electrode and the ground electrode. Therefore, even if this part is bent in the radial direction, it is possible to reliably prevent shorting with the ground electrode. Therefore, since the terminals of the power supply means are only opened when the electrodes are fused, the power supply means and the like can be protected from a failure due to a short circuit.

  According to the second invention, even if the length of the portion connected to the power supply means side from the fusing portion of the high-voltage side electrode cannot be shortened due to design restrictions or the like, this portion is the ground electrode at the time of electrode fusing. Can be reliably prevented by the insulator. Therefore, since the terminals of the power supply means are only opened when the electrodes are fused, the power supply means and the like can be protected from a failure due to a short circuit.

  According to the third invention, the melted portion can be easily formed by narrowing a part of the high-voltage side electrode.

  According to the fourth aspect of the present invention, the fusing part can be easily formed by using a material having a low melting point for part of the high-voltage side electrode. In addition, since the material of the fusing part is different, the outer shape of the high voltage side electrode, that is, the distance between the high voltage side electrode and the ground electrode can be kept constant even at the position of the fusing part, and the discharge between the electrodes It can be stabilized.

It is a block diagram for demonstrating the discharge reactor by Embodiment 1 of this invention. It is a block diagram for demonstrating the discharge reactor by Embodiment 2 of this invention.

Embodiment 1 FIG.
[Configuration of Embodiment 1]
Hereinafter, Embodiment 1 of the present invention will be described with reference to FIG. FIG. 1 is a configuration diagram for explaining a discharge reactor according to Embodiment 1 of the present invention. FIG. 1 is a sectional view in which the discharge reactor is broken along the central axis of the ground electrode. In this figure, the discharge reactor 10 includes a ground electrode (cathode) 12 formed in a cylindrical shape from a metal material or the like, and a high-voltage side electrode (anode) 14 formed from an elongated metal material or the like. In the present embodiment, a case where a cylindrical metal part is used as the ground electrode 12 is exemplified. However, the present invention is not limited thereto, and a metal is formed on the inner peripheral surface of a discharge tube or the like formed in a cylindrical shape. A ground electrode made of a film or the like may be provided.

  The high-voltage side electrode 14 is disposed on the inner peripheral side of the ground electrode 12, and extends in the axial direction along the central axis thereof in a state of being separated from the ground electrode 12. The high-voltage side electrode 14 faces the ground electrode 12 in the radial direction, and the distance D between the electrodes is adjusted to a predetermined dimension. Further, the axial lengths of the ground electrode 12 and the high-voltage side electrode 14 are formed to be substantially equal. Furthermore, a power supply connection portion 14A is provided on one end side in the length direction of the high-voltage side electrode 14, and a power supply circuit 16 is connected to the power supply connection portion 14A.

  The power supply circuit 16 is configured by a generally known pulse generation circuit, and its output terminal is connected to the power supply connection portion 14 </ b> A of the high-voltage side electrode 14. The ground terminal of the power supply circuit 16 is grounded together with the ground electrode 12. Then, the power supply circuit 16 outputs a high voltage pulse whose waveform, period, etc. are adjusted, for example, and applies a high voltage between the electrodes 12 and 14.

  In the discharge reactor 10 configured as described above, when a high voltage is applied between the high-voltage side electrode 14 and the ground electrode 12 by the power supply circuit 16, a discharge is generated between the two electrodes 12 and 14. By this discharge, oxygen in the air existing between the electrodes 12 and 14 is ozonized, so that the discharge reactor 10 can generate ozone. Note that the mechanism for supplying air to the inner peripheral side of the ground electrode 12 and the mechanism for collecting ozone generated in the ground electrode 12 are generally known techniques. The illustration and description of the mechanism are omitted.

  Next, the fusing part 18 which is a characteristic matter of the present embodiment will be described. The fusing part 18 is formed by making a part of the high-voltage side electrode 14 narrower than the surrounding part. That is, the width dimension W1 of the fusing part 18 is formed narrower than the width dimension W2 of the surrounding part (parts other than the fusing part 18) (W1 <W2). For this reason, when a larger current than usual flows through the high-voltage side electrode 14 due to an abnormal discharge such as arc discharge, it is narrow and due to the current at the position of the fusing portion 18 where the electrical resistance value is large. Fever becomes noticeable. Therefore, the fusing part 18 is configured to blow out earlier than the surrounding part when abnormal discharge occurs.

  Moreover, the formation position of the fusing part 18 is preset so as to satisfy the following conditions. This condition refers to the distance between the power supply connection portion 14A and the fusing portion 18 in the high-voltage side electrode 14, that is, the length L of the electrode piece 14B located between the power supply connection portion 14A and the fusing portion 18. This is shorter than the inter-electrode distance D described above (L <D). Thus, even when the electrode piece 14B connected to the power supply circuit 16 side is bent radially outward toward the ground electrode 12 when the high-voltage side electrode 14 is blown at the position of the fusing part 18, the electrode piece 14B is There is no contact with the ground electrode 12.

  According to the above configuration, when an abnormal discharge occurs, the fusing position of the high voltage side electrode 14 can be appropriately determined by the fusing part 18. That is, the fusing part 18 can make the length L of the electrode piece 14B shorter than the inter-electrode distance D at the time of electrode fusing. Therefore, it is possible to reliably prevent the electrode piece 14B from being short-circuited with the ground electrode 12. Therefore, when the electrodes are blown, the output terminal side of the power supply circuit 16 is only opened, so that the power supply circuit 16 and the like can be protected from a failure due to a short circuit. Moreover, the fusing part 18 can be easily formed by narrowing a part of the high-voltage side electrode 14.

Embodiment 2. FIG.
Next, Embodiment 2 of the present invention will be described with reference to FIG. The discharge reactor 20 according to the present embodiment is configured in substantially the same manner as in the first embodiment. However, in the present embodiment, the high-voltage side electrode 22 is formed of two kinds of metal materials having different melting points, and the insulator 26 is disposed on the inner peripheral side of the ground electrode 12. 1 and the configuration is different. In the present embodiment, the same components as those in the first embodiment are denoted by the same reference numerals, and the description thereof is omitted.

[Features of Embodiment 2]
The high-voltage side electrode 22 of the discharge reactor 20 includes a power supply connection portion 22A, an electrode piece 22B, a fusing portion 24, and the like, almost as in the first embodiment. And the fusing part 24 is formed more narrowly than the surrounding site | part. However, in the present embodiment, the fusing part 24 is formed of a metal material having a relatively low melting point, such as stainless steel. On the other hand, the part other than the fusing part 24 in the high-voltage side electrode 22 is formed of a metal material having a relatively high melting point, such as tungsten.

  Therefore, when compared with the first embodiment, the fusing part 24 is configured to be easily blown faster than the surrounding part. In the present embodiment, the fusing part 24 is formed to be narrow with a low melting point material. However, the present invention is not limited to this, and if the fusing part 24 is formed of a low melting point material, the width dimension thereof may be formed to be equal to the surrounding part. Needless to say, as in the first embodiment, the width of the fusing part 24 may be narrower than that of the surrounding portion, and the same material may be used.

  Further, in the present embodiment, the length L ′ of the electrode piece 22B located between the power supply connecting portion 22A and the fusing portion 24 is set to a dimension greater than the interelectrode distance D due to design restrictions and the like. Yes. For this reason, when the high-voltage side electrode 22 is melted at the position of the melted part 24, the electrode piece 22B may be bent in the radial direction to come into contact with the ground electrode 12. Therefore, in the present embodiment, the insulator 26 is provided on the inner peripheral side of the ground electrode 12. The insulator 26 is in contact with the melted side end of the electrode piece 22B when the high voltage side electrode 22 is melted, and prevents the electrode piece 22B from contacting the ground electrode 12.

  For this reason, the insulator 26 is disposed at a position corresponding to the fusing side end of the electrode piece 22 </ b> B in the length direction of the high-voltage side electrode 22. More specifically, the insulator 26 is preferably installed at a position facing the electrode piece 22B located between the power supply connecting portion 22A and the fusing portion 24 in the high-voltage side electrode 22 in the radial direction. The insulator 26 is disposed below the electrode piece 22B in consideration of the fact that the electrode piece 22B hangs due to its own weight when the electrode is melted.

  In the present embodiment configured as described above, substantially the same operational effects as those of the first embodiment can be obtained. In particular, in the present embodiment, since the insulator 26 is disposed, the electrode piece 22B is connected to the ground electrode at the time of electrode fusing even when the electrode piece 22B connected to the power supply circuit 16 side cannot be shortened due to design restrictions or the like. It is possible to reliably prevent contact with the insulator 12 by the insulator 26. In the present embodiment, the fusing part 24 can be easily formed by using a material having a low melting point for a part of the high-voltage side electrode 22. In addition, for example, when the fusing part 24 is not formed narrowly and only the material is different from other parts, the outer shape of the high-voltage side electrode 22, that is, the high-voltage side electrode 22 and the ground electrode 12 The inter-electrode distance D can be kept constant even at the position of the fusing part 24, and the discharge between the electrodes can be stabilized.

  In the second embodiment, the high voltage side electrode 22 is made of two kinds of materials having different melting points, and the insulator 26 is used corresponding to the arrangement of the fusing part 24. However, the present invention is not limited to this, and the insulator 26 may be used in the first embodiment.

DESCRIPTION OF SYMBOLS 10, 20 Discharge reactor 12 Ground electrode 14, 22 High voltage side electrode 14A, 22A Power supply connection part 14B, 22B Electrode piece 16 Power supply circuit (power supply means)
18, 24 Fusing part 26 Insulator W1, W2 Width L, L 'Length D Distance between electrodes

Claims (4)

A ground electrode formed in a cylindrical shape;
A high-voltage side electrode disposed on an inner peripheral side of the ground electrode, extending in the axial direction in a state of being opposed to the ground electrode with a predetermined distance between the electrodes, and having a power supply connecting portion provided on an end side in the axial direction; ,
A power supply means connected to a power supply connecting portion of the high-voltage side electrode, and applying a voltage between the high-voltage side electrode and the ground electrode;
It is formed by a part of the high-voltage side electrode, and is disposed at a position where the distance between the power supply connection portion is shorter than the distance between the electrodes, and when a larger current flows than normal, A fusing part that blows out early,
A discharge reactor comprising: A ground electrode formed in a cylindrical shape;
A high-voltage side electrode disposed on an inner peripheral side of the ground electrode, extending in the axial direction in a state of being opposed to the ground electrode with a predetermined distance between the electrodes, and having a power supply connection portion provided on an end side in the axial direction; ,
A power supply means connected to a power supply connecting portion of the high-voltage side electrode, and applying a voltage between the high-voltage side electrode and the ground electrode;
It is formed by a part of the high-voltage side electrode, and is disposed at a position where the distance between the power supply connection portion is equal to or more than the distance between the electrodes, and more than the surrounding region when a larger current flows than usual. A fusing part that blows out early,
An insulator that is provided on the inner peripheral side of the ground electrode, and prevents the high-voltage side electrode from coming into contact with the ground electrode when the melted portion of the high-voltage side electrode is melted;
A discharge reactor comprising:   The discharge reactor according to claim 1 or 2, wherein the high-voltage side electrode is formed with a narrow portion that is narrower than a surrounding portion, and the fusing portion is configured by the narrow portion.   The high voltage side electrode is formed with a low melting point portion made of a material having a melting point lower than that of the surrounding portion, and the fusing portion is constituted by the low melting point portion. The discharge reactor according to item.

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