JP5662649B2 - Ozone generating electrode - Google Patents

Description

  The present invention relates to an ozone generator used for water treatment and the like, and relates to a structure of an ozone generating electrode capable of efficiently generating ozone by cooling discharge heat generated at an electrode during ozone generation.

  An ozone generator is an apparatus used for water treatment in water and sewage.

Conventionally used ozone generators have two flat electrodes facing each other, a dielectric is disposed on at least one of the opposed electrodes, a discharge space is formed between them, and oxygen is introduced into this discharge space. There is a method in which ozone is generated from oxygen by applying an alternating high voltage to two electrodes while flowing a raw material gas. Further, as shown in FIG. 7 , a cylindrical electrode is used, a ground electrode is provided outside, a high voltage electrode is disposed inside the ground electrode, and a dielectric is disposed on at least one of the opposed electrodes. A coaxial cylindrical ozone generating electrode is also used.

In the case of the ozone generating electrode coaxial cylinder type, as shown in FIG. 7, circulating the raw material gas 20 containing oxygen to the discharge space 6 between the grounding electrode 1 and the high voltage electrode 3. The ground electrode 1 and the high voltage electrode 3 are connected to an AC high voltage power supply device (not shown), and silent discharge is generated in the discharge space 6 by the electric power supplied from the power supply device. Oxygen atoms are generated from oxygen molecules contained in the source gas 20 flowing through the discharge space 6 due to electron collision caused by discharge, and ozone is generated by recombination of oxygen atoms and other oxygen molecules in the vicinity thereof. The generated ozonized gas is supplied from the discharge space 6 to an apparatus or a place having a substance to be treated that comes into contact with ozone (not shown).

  The high voltage electrode 3 is provided with a refrigerant flow path for cooling the electrode in order to remove the heat generated by the discharge, and the high voltage electrode 3 is cooled by circulating the refrigerant therethrough. Alternatively, although not shown, a coolant channel for cooling the electrode may be provided adjacent to the ground electrode 1 outside the ground electrode 1 to cool the ground electrode 1.

  The purpose of cooling the electrode in this way is to prevent the thermal decomposition of ozone because the electrode generates heat by discharge and ozone generated in the discharge space 6 may be decomposed again by this heat generation. is there.

Various types of coaxial cylindrical ozone generating electrodes have been proposed. For example, Patent Document 1 discloses a coaxial cylindrical ozone generating electrode having a cooling body inside (see Patent Document 1). Here, there is disclosed a structure in which an expansion gap is provided so as to prevent breakage of a dielectric tube such as glass due to temperature rise due to heat generation or expansion or contraction due to cooling.
By the way, in order to cool the cylindrical inner electrode which is a high-voltage electrode or a ground electrode, a method is employed in which a space is provided in the inner electrode, and a cooling refrigerant is passed through the space to cool the electrode.
In order to improve the cooling efficiency of the inner electrode in this case, an ozone generating electrode is proposed in which a columnar flow path regulating member for regulating the flow path of the refrigerant to the inner peripheral side of the cylindrical wall is provided in the inner electrode. (See Patent Documents 2 and 3).

Japanese Patent Laid-Open No. 61-14105 JP-A-7-223805 JP-A-10-182111

  By the way, with respect to such a conventional ozone generating electrode, it is required to save the trouble of positioning and fixing the flow path regulating member in the inner electrode in advance, thereby facilitating manufacture.

  An object of the present invention is to provide an ozone generating electrode capable of facilitating manufacture even when a columnar flow path regulating member is provided in an inner electrode, and an ozone generating apparatus using the same.

That is, the present invention has the following contents.
(1) A cylindrical inner electrode having a cylindrical wall portion and a pair of end wall portions that respectively close both end sides thereof, an outer electrode disposed outside the inner electrode so as to face each other through a space, and the outer side A dielectric provided on at least one of the electrodes and the mutually facing surfaces of the inner electrode, and the inner electrode is provided with a refrigerant inlet and outlet on each of its end walls, respectively. An ozone generating electrode that can be cooled from the inside by a refrigerant circulating through an inlet and an outlet, and in the inner electrode, a columnar shape that restricts the flow path of the refrigerant to the inner peripheral side of the cylinder wall The cylinder side which has a flow-path control member and at least any one of the side surface of the said flow-path control member and the said cylindrical wall inner peripheral part hold | maintains the flow of the refrigerant | coolant in the cylindrical wall inner peripheral part side of the said inner side electrode It has a protruding spacer, Kiryuro regulating member and at least one of said downstream end wall portion has an outlet projecting spacers to hold the flow of the refrigerant in the outlet of the downstream end wall portion, the flow path regulating The member is provided so as to be movable in the inner electrode along the axial direction of the inner electrode , and is positioned and fixed at a position for receiving the flow of the refrigerant and holding the flow of the refrigerant in the inner electrode. An ozone generating electrode.

( 2 ) The ozone generating electrode according to ( 1 ), wherein each of the cylindrical side protruding spacer and the outlet side protruding spacer is provided on the flow path regulating member.

( 3 ) The ozone generating electrode according to (1) or (2), wherein the flow path regulating member has a cross-sectional shape similar to that of the inner space of the inner electrode.

( 4 ) The ozone generating electrode according to any one of (1) to (3), wherein the inner electrode is formed in a cylindrical shape.

( 5 ) In the case where the upstream end wall portion is installed at a position lower than the downstream end wall portion, at least one of the flow path regulating member and the upstream end wall portion is the The ozone generating electrode according to any one of (1) to (4), further including an inlet-side protruding spacer that holds a refrigerant flow at the inlet.

( 6 ) An ozone generator using the ozone generating electrode according to any one of (1) to ( 5 ) above.

  According to the ozone generating electrode according to the present invention, in the inner electrode, the column-shaped flow path regulating member that regulates the flow path of the refrigerant to the inner peripheral side of the cylinder wall is movable along the axial direction. Since the flow of the refrigerant at the outlet of the inner peripheral side of the inner wall and the downstream end wall of the inner electrode is maintained, the flow path regulating member is pressed against the downstream end wall as soon as the refrigerant flows. Thus, it is positioned at a position where a smooth flow of the refrigerant can be ensured, and it is possible to perform the same function as the positioning and fixing in the inner electrode in advance without using the flow force of the refrigerant. That is, according to such an ozone generating electrode, it is possible to save the trouble of positioning and fixing the flow path regulating member in the inner electrode in advance, thereby facilitating the manufacture.

Incidentally, as in the present invention, when in the same direction as the refrigerant flows in at least one of the flow path regulating member and the downstream end wall portion provided projections (outlet side protruding spacer), the flow path of the flow of the refrigerant The flow rate of the refrigerant flowing through the flow path can be increased by narrowing, and the refrigerant can flow in a turbulent state instead of a laminar state. The heat exchange efficiency with the inner electrode and the cooling effect are improved, and the heat generated by the inner electrode for discharge can be efficiently removed when ozone is generated. As a result, the thermal decomposition of ozone is prevented, It can be generated more efficiently. In addition, as a secondary effect, when the electrode is used in a horizontal state, air may remain in the cooling refrigerant flow path. Air can be swept away.

  In addition, if at least one of the flow path regulating member and the upstream end wall portion has an inlet-side protruding spacer that holds the flow of the refrigerant at the inlet, the ozone generating electrode has its upstream end wall portion. The above-mentioned effect can be enjoyed even when the type is installed at a position lower than the downstream end wall.

It is an example of sectional drawing of a refrigerant distribution direction when a channel regulation member is attached to an ozone generating electrode of the present invention, and a projection is attached to a side of a channel regulation member. It is an example of a cross-sectional view perpendicular to the flow direction of the refrigerant between the flow path regulating member and the inner electrode when the flow path regulating member is attached to the ozone generating electrode of the present invention and the protrusion is attached to the side surface of the flow path regulating member. It is an example of a cross-sectional view perpendicular to the flow direction of the refrigerant between the flow path regulating member and the inner electrode when the flow path regulating member is attached to the ozone generating electrode of the present invention and the protrusion is attached to the side surface of the flow path regulating member. FIG. 3 is a cross-sectional view of the flow path regulating member and the inner electrode at right angles in the refrigerant flow direction, showing a fixed state when the flow path regulating member is attached to the ozone generating electrode of the present invention and the protrusion is attached to the side surface of the flow path regulating member. It is an example. FIG. 3 is a cross-sectional view of the flow path regulating member and the inner electrode at right angles in the refrigerant flow direction, showing a fixed state when the flow path regulating member is attached to the ozone generating electrode of the present invention and the protrusion is attached to the side surface of the flow path regulating member. It is an example. FIG. 3 is an example of a sectional view of the flow path regulating member and the inner electrode in the refrigerant flow direction showing a fixed state when the flow path regulating member is attached to the ozone generating electrode of the present invention and a protrusion is attached to the side surface of the flow path regulating member. is there. It is an example of the sectional view of the refrigerant distribution direction of a channel regulation member and an inner side electrode when a channel regulation member is attached to the ozone generating electrode of the present invention, and a spiral projection is attached. It is an example of sectional drawing of a refrigerant distribution direction at the time of attaching a projection to the ozone generation electrode of the present invention, and a projection to the side, and also attaching a projection in the same direction as a refrigerant circulation direction. It is an example of sectional drawing of the refrigerant | coolant distribution direction of the ozone generation electrode by a prior art.

Next, the present invention will be described in more detail. Figure 1 is fitted with a flow path regulating member on the ozone generating electrode of the present invention is an example of a cross-sectional view of the refrigerant flow direction when fitted with a projection on the side surface of the flow path regulating member, FIG. 2 (a) (b ) Is an example of a cross-sectional view perpendicular to the refrigerant flow direction of the flow path regulating member and the inner electrode.

The ozone generating electrode according to the present invention is an ozone generating electrode that employs a coolant as a refrigerant, and as shown in FIGS. 1 to 6 , a pair of end wall portions 9a that respectively close the cylindrical wall portion 3a and both end sides. , 9b, a cylindrical inner electrode 3 disposed outside the inner electrode 3 so as to face each other through a space, and at least one of these electrodes facing each other. The inner electrode 3 is provided with a refrigerant inlet and outlet on each of the end walls 9a and 9b, respectively, and the inner electrode 3 is formed by a refrigerant circulating through the inlet, the flow path 4 and the outlet. It is possible to cool from the inside, and is provided with a columnar flow path regulating member 5 that regulates the flow path of the refrigerant in the inner electrode 3 toward the cylindrical wall inner peripheral part 3b side, and oxygen is contained in the space. Supply raw material gas 20 3, by applying an AC high voltage between the outer electrode 1 is configured as generating ozonized gas 21 from the source gas 20 containing oxygen was supplied by generating electrical discharge in the space. In such an ozone generating electrode, at least one of the side portion of the flow path regulating member 5 and the cylindrical wall inner peripheral portion 3b holds the refrigerant flow on the cylindrical wall inner peripheral portion 3b side of the inner electrode 3. has a side projecting spacers 7, at least one of the flow path regulating member 5 and the downstream end wall portion 9a, shaped to hold the flow of the refrigerant in the outlet of the lower flow end wall portion 9a The flow path regulating member 5 is slidably provided in the inner electrode 3 along the axial direction of the inner electrode 3.

  More specifically, as shown in FIG. 1, the ozone generating electrode of the present invention forms a discharge space 6 with the outer electrode 1 and the inner electrode 3 facing each other, and the inner electrode 3 or the outer electrode 1 The dielectric 2 is provided on at least one side, and the refrigerant flow path 4 is provided inside or adjacent to the inner electrode 3, and the flow restriction member 5 is inserted into the refrigerant flow path 4. In the case of FIG. 1, the dielectric 2 is disposed on the discharge space side of the outer electrode 1. The refrigerant flow path 4 is provided in the inner electrode 3. In the case of generating ozonized gas, a source gas 20 containing oxygen is introduced from one of the ozone generating electrodes of the present invention, and an alternating high voltage is applied between the outer electrode 1 and the inner electrode 3 to discharge ozone. Generate gas.

  Heat is generated by the discharge used to generate this ozonized gas, but if the temperature of the gas rises due to this heat, the ozone decomposes and the generation efficiency of the ozonized gas decreases. It is necessary to prevent temperature rise. For this purpose, it is necessary to provide a coolant flow path 4 inside or adjacent to at least one of the electrodes to cool the coolant by circulating it. In the case of FIG. 1, the refrigerant is introduced from the refrigerant inlet 10 and discharged from the refrigerant outlet 11 through the refrigerant flow path 4. At this time, since the flow path regulating member 5 is inserted into the refrigerant flow path 4 in the inner electrode, the refrigerant passes through the gap between the flow path regulating member 5 and the inner peripheral portion of the cylindrical wall of the inner electrode. Cool down the wall. By inserting the flow path regulating member 5, the cross-sectional area of the flow path of the refrigerant is reduced, and the refrigerant flows through the gap in a turbulent state, so that the efficiency of heat exchange with the wall surface of the electrode is improved. Can be effectively cooled.

  Although FIG. 1 shows the case where the refrigerant flow path 4 is provided inside the inner electrode 3, in addition to this, the refrigerant flow path may be provided adjacent to the outside of the outer electrode 1. The dielectric 2 may also be provided on the outer electrode 1 side, or may be formed on both the outer electrode 1 and the inner electrode 3. The inner electrode 3 may be formed in a cylindrical shape such as a coaxial polygonal column shape as well as a coaxial cylindrical shape.

Figure 2 (a) (b) is a sectional view of the inner electrode 3 and the flow path regulating member 5 inserted therein the ozone generating electrode is cylindrical. FIG. 2A shows the case where the inner electrode 3 is cylindrical and the flow path regulating member 5 is also cylindrical. In this case, the refrigerant flow path 4 is annular as shown in the figure. The shape of the ozone generating electrode is not limited to a cylinder, but may be a polygonal cross section such as a quadrangular prism or hexagonal prism. Further, the flow path regulating member 5 may have a polygonal cross section as shown in FIG. 2B or a star shape or other geometrical figure.

  It is preferable that the cross-sectional shape of the refrigerant flow path 4 of the inner electrode 3 and the cross-sectional shape of the flow path regulating member 5 are similar to each other. In this case, the similarity ratio is such that the cross-sectional shape of the flow path regulating member 5 is less than 1 when the cross-sectional shape of the refrigerant flow path 4 of the inner electrode 3 is 1.

  The material constituting the outer electrode 1 and the inner electrode 3 is preferably a material resistant to ozone such as stainless steel. Moreover, the material of the flow path regulating member 5 inserted into the flow path of the refrigerant is not particularly limited as long as it is a material that does not absorb water, but metals, synthetic resins, ceramics, and the like are preferable. In particular, those made of synthetic resin are preferable from the viewpoint of durability and weight, and further, those having a structure in which the inside is a cavity and both ends are closed by end wall portions are preferable.

As shown in FIG. 1 , in the present invention, both end walls 9 a and 9 b of the inner electrode 3 have a refrigerant inlet 10 and an outlet 11, respectively. At least one of the wall inner peripheral parts 3b has a cylinder-side protruding spacer 7 that holds the flow of the refrigerant on the cylinder wall inner peripheral part 3b side of the inner electrode 3, and the flow path regulating member 5 includes the inner electrode 3 is slidably provided in the inner electrode 3 along the axial direction.

  Thus, by providing the cylindrical protrusion 7 between the inner side of the inner electrode 3 and the side surface portion of the flow path regulating member 5, it is possible to prevent the flow path regulating member 5 from being biased, and at the center of the inner electrode 3. It can be installed so that the gap between the inner electrode 3 and the flow path regulating member 5 is uniform. As a result, the amount of the cooling refrigerant flowing through the gap is uniform over the entire electrode surface, and the electrode can be cooled uniformly.

The cylinder-side protruding spacer 7 may be fixed to the flow path regulating member 5 as shown in FIGS. 2 (a) and 2 (b) , but the inner electrode 3 as shown in FIGS. 3 (a) and 3 (b). You may fix to the side. Further, it is preferable to install a plurality of cylindrical side protruding spacers 7 in the length direction and the periphery of the flow path regulating member 5, and as shown in FIG. 4 , two or more in the length direction and 3 in the circumferential direction. It is preferable to provide a location. Alternatively, as shown in FIG. 5 , a structure in which a spring-like protrusion is wound around the cylindrical flow path regulating member 5 in a spiral shape may be used.

  The material of the tube-side protruding spacer 7 is not particularly limited as long as it is a material that does not absorb water, but metals, synthetic resins, ceramics, glass, and the like are preferable.

FIG. 6 shows the ozone generating electrode of the present invention in which the flow path regulating member 5 is inserted, the cylinder-side protruding spacer 7 is attached, and the outlet-side protruding spacer 8a provided in the same direction as the refrigerant flow direction is further attached. It is an example of sectional drawing of the refrigerant | coolant distribution direction. The reason why the outlet side protruding spacer 8a is required to be provided also on the outlet side in this manner is that the refrigerant is restricted even when the flow path regulating member 5 receives the refrigerant flow and is pressed against the downstream end wall portion 9a. This is because an ozone generating electrode capable of facilitating the manufacture by being positioned at a position where a smooth flow can be ensured. Therefore, if it plays such a role, in the present invention, instead of the flow path regulating member 5 provided with the outlet-side protruding spacer 8a, the downstream end wall portion 9a is provided with the outlet-side protruding spacer. Using at least one of the other flow path regulating member and the downstream end wall portion formed so that the flow path regulating member holds the refrigerant flow at the outlet of the downstream end wall portion. There is no problem. Here, as a shape in which the flow path regulating member holds the refrigerant flow at the outlet of the downstream end wall, for example, at least one of the flow path regulating member and the downstream end wall is partially recessed. Thus, a channel that communicates with the outlet is secured between the channel regulating member in a state where the channel regulating member is pressed against the downstream end wall and the downstream end wall.

  In addition, it is preferable that both the cylinder side protruding spacer 7 and the outlet side protruding spacer 8 a are provided in the flow path regulating member 5. By doing so, it is possible to manufacture the inner electrode 3 more easily.

  Further, when the upstream end wall portion 9b is installed at a position lower than the downstream end wall portion 9a, a refrigerant is provided in at least one of the flow path regulating member 5 and the upstream end wall portion 9b. Having the inlet-side protruding spacer 8b provided in the same direction as the flow direction is preferable because the refrigerant flow on the refrigerant inlet 10 side can be smoothly held and circulated.

  The material of the outlet-side protruding spacer 8a and the inlet-side protruding spacer 8b is not particularly limited as long as it is a material that does not absorb water as well, but metals, synthetic resins, ceramics, glass, and the like are preferable. The outlet side protruding spacer 8 a and the inlet side protruding spacer 8 b may be fixed to the flow path regulating member 5 or to the inner electrode 3 in the same manner as the cylindrical side protruding spacer 7.

  By using the ozone generating electrode of the present invention, ozone can be efficiently generated, and the present invention can be used more effectively in various industrial fields such as water treatment facilities where ozone has been conventionally used. .

1. Outer electrode, 2. 2. dielectric, Inner electrode, 3a. Cylinder wall, 3b. 3. inner peripheral part of the cylinder wall; 4. flow path; 5. a flow path regulating member; 6. discharge space; Cylinder-side protruding spacer, 8a. Outlet side protruding spacer, 8b. Inlet-side protruding spacer, 9a. Downstream end wall, 9b. Upstream end wall, 20. Source gas, 21. Ozonized gas.

Claims (6)

A cylindrical inner electrode having a cylindrical wall portion and a pair of end wall portions that respectively close both end sides thereof, an outer electrode disposed outside the inner electrode so as to face each other through a space, the outer electrode, A dielectric provided on at least one of the mutually facing surfaces of the inner electrode, and the inner electrode is provided with a refrigerant inlet and outlet on each end wall, respectively. An ozone generating electrode that can be cooled from the inside by a refrigerant circulating through the outlet,
In the inner electrode, it has a columnar flow path regulating member that regulates the flow path of the refrigerant to the inner peripheral side of the cylinder wall,
At least one of the side portion of the flow path regulating member and the inner peripheral portion of the cylindrical wall has a cylindrical protrusion spacer that holds the flow of the refrigerant on the inner peripheral portion side of the inner electrode,
At least one of the flow path regulating member and the downstream end wall portion has an outlet-side protruding spacer that holds the flow of the refrigerant at the outlet of the downstream end wall portion,
The flow path regulating member is provided so as to be movable in the inner electrode along the axial direction of the inner electrode , and at a position for receiving the flow of the refrigerant and holding the flow of the refrigerant in the inner electrode. An ozone generating electrode that is positioned and fixed . Any of the cylindrical side projecting spacers and the outlet-side projecting spacer is provided in the flow path regulating member, the ozone generating electrode according to claim 1.   The ozone generating electrode according to claim 1 or 2, wherein the flow path regulating member has a cross-sectional shape similar to a cross-sectional shape of the internal space of the inner electrode.   The ozone generating electrode according to any one of claims 1 to 3, wherein the inner electrode is formed in a cylindrical shape.   When the upstream end wall portion is installed at a position lower than the downstream end wall portion, at least one of the flow path regulating member and the upstream end wall portion is at the inlet. The ozone generating electrode according to any one of claims 1 to 4, further comprising an inlet-side protruding spacer that holds the flow of the refrigerant. An ozone generator using the ozone generating electrode according to any one of claims 1 to 5 .

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