JP5202421B2 - Manufacturing method of inner electrode of ozone generating electrode - Google Patents

Description

  The present invention relates to a method for producing an inner electrode used for an ozone generating electrode of an ozone generator used for water treatment or the like. More specifically, the present invention relates to a method for manufacturing an inner electrode of an ozone generating electrode, in which a flow path regulating member is inserted into the inner electrode, and discharge heat generated by the electrode during ozone generation can be efficiently cooled.

  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. In addition, as shown in FIG. 2, a cylindrical electrode is used, a cylindrical ground electrode (outer electrode) is provided outside, and a cylindrical high voltage electrode (inner electrode) is disposed inside the ground electrode. A coaxial cylindrical ozone generating electrode in which a dielectric is disposed on at least one of the opposed electrodes is also used.

  In the case of a coaxial cylindrical ozone generating electrode, a source gas 20 containing oxygen is circulated in the discharge space 6 between the ground electrode 1 and the high voltage electrode 3 as shown in FIG. 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

  In the inner electrode for an ozone generating electrode that incorporates such a columnar flow path regulating member, a resin-like one is used as the columnar flow path regulating member, and one end wall is used for the manufacturing method of this inner electrode. A welding step is included in which the other end wall portion is attached to the cylindrical wall portion with one end wall portion by welding while the flow path regulating member is accommodated in the cylindrical wall portion with the portion. Therefore, when the inner electrode is manufactured by performing the welding process, there is a problem that the resinous flow path regulating member is melted by the heat of welding. Even when a flow path regulating member other than resin is used, deformation and distortion of the flow path regulating member due to heat during welding often become a problem.

  Even if the object of the present invention includes a welding process in which welding heat is generated when the other end wall part is attached to the cylindrical wall part with one end wall part by welding, deformation or strain is applied to the flow path regulating member. It is providing the manufacturing method of the inner side electrode for ozone generation electrodes which does not arise.

That is, the present invention has the following contents.
(1) A cylindrical cylindrical wall portion and a pair of end wall portions that respectively close both ends thereof, each having an end wall portion provided with an inlet and an outlet for the refrigerant, and a refrigerant flow path therein Is an inner electrode that accommodates a columnar flow path regulating member that regulates the inner wall of the cylindrical wall, and is disposed on the inner side so as to face the outer electrode through a space, and the two electrodes face each other. A method of manufacturing an inner electrode for an ozone generating electrode, wherein an ozone generating electrode is formed by disposing a dielectric on at least one of the surfaces, wherein one end of the inner electrode is provided in the cylindrical wall with one end wall. A welding step of accommodating the flow path regulating member in a state where the wall portion is positioned below the cylindrical wall portion and attaching the other end wall portion to the cylindrical wall portion with the one end wall portion by welding. This welding process includes one end wall of the accommodated flow path regulating member Portion connecting the cylindrical wall portion of the biasing is made in a state immersed in the coolant inside so as to be positioned below the liquid surface, the manufacturing method of the inner electrode for an ozone generating electrode.

(2) The welding process is performed in a state in which the cylindrical wall portion with one end wall portion is immersed in the cooling liquid in a state where the top portion of the accommodated flow path regulating member is located below the liquid surface. The manufacturing method of the inner electrode for ozone generation electrodes as described in said (1) which exists.

(3) The welding process described in (1) or (2), wherein the welding step is performed while preventing the coolant from flowing into the cylindrical wall portion with one end wall portion through the inlet or the outlet of the refrigerant. Of manufacturing inner electrode for ozone generating electrode.

  According to the method for manufacturing an inner electrode for an ozone generating electrode according to the present invention, it is possible to avoid the influence of strain and deformation for sealing processing by welding the end portion of the inner electrode. In particular, when the material of the flow path regulating member inserted in the inside is made of synthetic resin, when performing sealing processing by welding, there is thermal deformation or distortion of the flow path regulating member due to heat during welding. Although this is a big problem, such a problem can be solved by the method of the present invention.

It is explanatory drawing which shows one Example of the manufacturing method of the inner side electrode of the ozone generation electrode which concerns on this invention. It is an example of sectional drawing of the refrigerant | coolant distribution direction of the conventional ozone generation electrode.

  Next, the present invention will be described in more detail. FIG. 1 is an explanatory view showing an embodiment of a method for producing an inner electrode of an ozone generating electrode according to the present invention.

  As shown in FIGS. 1 and 2, the ozone generating electrode is composed of a cylindrical cylindrical wall portion 3a and a pair of end wall portions 7a and 7b that respectively close both ends thereof, and a refrigerant inlet 10 and an outlet respectively. 11 is an inner electrode 3 having end wall portions 7a, 7b provided with a columnar flow passage regulating member 5 for restricting the refrigerant flow passage 4 to the inner peripheral side of the cylindrical wall therein. The outer electrode 1 is disposed on the inner side so as to be opposed to each other through a space, and the dielectric 2 is disposed on at least one of the mutually facing surfaces of the electrodes 1 and 3.

  The present invention is a manufacturing method of an inner electrode used for the above-mentioned ozone generating electrode, and as shown in FIG. 1, one end wall portion 7b is formed in a cylindrical wall portion 3a with one end wall portion 7b. A welding step in which the flow path regulating member 5 is accommodated in a state of being positioned below the wall portion 3a, and the other end wall portion 7a is attached to the cylindrical wall portion 3a with the one end wall portion 7b by welding. It is what has. In the present invention, this welding step is performed in the coolant A so that the portion of the accommodated flow path regulating member 5 that contacts the cylindrical wall portion 3a with one end wall portion 7b is located below the liquid level. It is characterized by being performed in a dipped state. Here, the cylindrical wall portion with one end wall portion refers to the cylindrical wall portion and the one other than the one in which one end wall portion as a separate member from the cylindrical wall portion is attached to the cylindrical wall portion by welding or the like. It is a concept including what is formed by integrally molding the end wall portion of.

  Specifically, as shown in FIG. 1, in the inner electrode 3 having a refrigerant circulation space 4 in a cylindrical shape used for a coaxial cylindrical ozone generating electrode, the cylindrical shape of the cylindrical inner electrode 3 is first set. One end portion of the refrigerant is sealed with one end wall portion 7b to which the refrigerant outlet 11 is attached, and then the flow path regulating member 5 is accommodated in the refrigerant circulation space 4. Next, the other cylindrical end portion of the inner electrode 3 is sealed with the other end wall portion 7a to which the refrigerant inlet 10 is attached, so that the refrigerant circulation space 4 is sealed.

  For the sealing of the cylindrical end portion of the inner electrode 3, a method of welding the end wall portions 7 a and 7 b at both end portions by a welding method using the welding device 40 is easy and preferable.

  When sealing the end portion of the inner electrode 3 by welding, thermal deformation or strain due to high temperature heating of the inner electrode 3 accompanying welding may occur. For this reason, the inner electrode 3 and the flow path regulating member may be generated. There is a case where the dimension between 5 and 5 is out of order and the cooling efficiency of the refrigerant as planned cannot be obtained. In addition, when the material of the flow path regulating member 5 is made of a synthetic resin, the flow path regulating member 5 itself may be adversely affected by heat deformation or partial melting due to high heat caused by welding. is there.

  In the method of the present invention, in order to solve such a problem, the welding process is performed so that the portion of the accommodated flow path regulating member 5 that comes into contact with the cylindrical wall portion 3a with one end wall portion 7b is the liquid level. It is performed in a state where it is immersed in the coolant A so as to be positioned on the lower side.

  Furthermore, in the method of the present invention, the welding step is performed with the cylindrical wall portion with one end wall portion 7b in a state where the top of the accommodated flow path regulating member 5 is located below the liquid level of the coolant A. It is preferable to perform in a state where 3a is immersed in the coolant A. Specifically, as shown in FIG. 1, while immersing a portion other than the welded portion of the inner electrode 3 in the container 30 containing the coolant A, the cylindrical wall portion 3 a of the inner electrode 3 that is exposed to the outside is immersed. The end wall 7a is welded to the other end so as to be in a watertight state or an airtight state by welding.

  In the welding step of welding the end wall portion 7a to the other end portion of the cylindrical wall portion 3a, the coolant flows into the cylindrical wall portion 3a with one end wall portion 7b through the refrigerant inlet 10 or the outlet 11. It is preferable to carry out while preventing this.

  In this manner, the flow path regulating member 5 is accommodated in the cylindrical wall portion 3a to which the one end wall portion 7b is attached, with the end wall portion 7b positioned below the cylindrical wall portion 3a. In the inner electrode 3 in which the flow path regulating member 5 is accommodated, the inner electrode 3 is immersed in the coolant A so that the portion in contact with the cylindrical wall portion with the one end wall portion 7b is positioned below the liquid surface. As a result, a certain distance can be secured between the other end of the inner electrode 3 that performs the sealing process by welding and the flow path regulating member 5, and the strain due to heat by the welding process of the other end. And deformation can be prevented, and various effects as described above can be avoided.

  The material of the flow path regulating member 5 inserted into the refrigerant circulation space 4 of the inner electrode 3 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 preferred from the viewpoint of excellent durability and light weight, and further, those having a structure in which both ends are closed with a hollow inside are preferred. In particular, when the flow path regulating member 5 is made of a synthetic resin, when the remaining end of the inner electrode 3 after the flow path regulating member 5 is inserted as described above is sealed by welding. The method of the present invention exhibits excellent effects.

  By manufacturing the inner electrode of the ozone generating electrode by the method of the present invention, the inner electrode 3 main body and the flow path regulating member 5 are not deformed or distorted, and can be manufactured with high accuracy. Therefore, in the inner electrode of the ozone generating electrode manufactured by the method of the present invention, the flow path regulating member can be accurately inserted therein, so that the cooling efficiency of the refrigerant is improved, and as a result, the ozone generation efficiency is improved. Can be made. Therefore, the present invention can be used more effectively in various industrial fields such as water treatment facilities where ozone is conventionally used.

1. Outer electrode, 2. 2. dielectric, Inner electrode, 3a. 3. Tube wall part 4. Refrigerant distribution space 5. a flow path regulating member; Discharge space, 7a. The other end wall, 7b. One end wall, 10. 10. refrigerant inlet, Refrigerant outlet, 20. Source gas, 21. Ozonized gas, 30. Cooling tank, 40. Welding equipment, A. Coolant.

Claims (3)

A cylindrical tubular wall portion and a pair of end wall portions that respectively close both ends thereof, each having an end wall portion provided with an inlet and an outlet for the refrigerant, and the refrigerant flow path therein It is an inner electrode in which a columnar flow restricting member that restricts to the inner wall side of the wall is accommodated, and is arranged on the inner side so as to face the outer electrode through a space. A method for producing an inner electrode for an ozone generating electrode, wherein an ozone generating electrode is formed by disposing a dielectric on either side,
The flow path regulating member is accommodated in the cylindrical wall portion with one end wall portion in a state where the one end wall portion is positioned below the cylindrical wall portion, and the cylindrical wall with this one end wall portion Including a welding step of attaching the other end wall portion to the portion by welding,
This welding process is performed in a state where the portion of the accommodated flow path regulating member that is in contact with the cylindrical wall portion with one end wall portion is immersed in the cooling liquid so as to be positioned below the liquid surface. The manufacturing method of the inner side electrode for ozone generation electrodes.   The welding process is performed in a state in which the cylindrical wall portion with one end wall portion is immersed in the cooling liquid in a state where the top portion of the accommodated flow path regulating member is located below the liquid surface. Item 2. A method for producing an inner electrode for an ozone generating electrode according to Item 1.   The ozone generating electrode for an ozone generating electrode according to claim 1 or 2, wherein the welding step is performed while preventing the coolant from flowing into the cylindrical wall portion with one end wall portion through the inlet or the outlet of the refrigerant. Manufacturing method of inner electrode.

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