JPH0328365B2 - - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION The present invention relates to an ozone generator used in general sterilization equipment, disinfection equipment, deodorization equipment, and the like.

Furthermore, a plurality of linear discharge electrodes are provided on the inner surface of a cylindrical dielectric, a planar induction electrode is provided within the thickness of the cylindrical dielectric, or on the outer surface, and an alternating current voltage is applied between these two electrodes. Alternatively, the present invention relates to an improvement of an ozone generator of the type that applies a pulse voltage.

A space discharge type ozone generator is used as a conventional ozone generator of this type.

This space discharge type ozone generator generates ozone by providing a gap between a discharge electrode and an induction electrode and flowing air or the like through the gap. (Japanese Unexamined Patent Publications No. 1988-19988, No. 26791-1980,
However, in this device, the ionic current flowing between the two electrodes generates heat, decomposes the ozone gas generated when air or oxygen flows through the inner surface of the cylindrical dielectric, and generates an ozonizer. There is a risk that the efficiency of the product will be reduced.

For this reason, methods have been considered to cool the inside and outside of the cylindrical dielectric body with air or liquid, but neither of these methods provides sufficient cooling, and if forced cooling is used,
The structure becomes complicated and the manufacturing cost increases.

An object of the present invention is to obtain a device that can efficiently cool a cylindrical dielectric, and another object is to reduce the manufacturing cost of the device.

This invention provides a discharge electrode on the inner surface of a cylindrical dielectric,
An induction electrode is provided outside the discharge electrode via the dielectric, the induction electrode and the dielectric are brought into close contact, and an AC or pulsed high voltage power source is connected between the discharge electrode and the induction electrode, Furthermore, cooling fins are provided on the outer surface of the cylindrical dielectric.

To explain this invention based on the attached drawings, the first
As shown in the figure, a linear discharge electrode 2 is attached to the inner surface of a cylindrical dielectric material 1 made of fine ceramic such as high-purity alumina porcelain, glass, or a suitable dielectric material along its length. A large number of electrodes are provided at intervals of approximately 5 mm, and a planar induction electrode 3 is embedded within the wall thickness of approximately 3 mm of the cylindrical dielectric body 1, and a radial interval of approximately 0.5 mm is provided on the outside of the discharge electrode 2. A part of the thickness of the dielectric material is provided between the two electrodes, and a brush-like fin 4 is provided on one side of the outer surface of the cylindrical dielectric material. Cooling fins 6 are provided by winding the other side of the formed metal band 5 into a coil shape.

Here, it is preferable that the above-mentioned linear discharge electrode 2 is formed by printing a thick film of ink mixed with tagsten powder on the inner surface of the cylindrical dielectric material 1, and then applying nickel plating to the surface thereof. Further, it is desirable for power supply that the aforementioned discharge electrodes 2 are all connected at their ends by connecting rings 2a and 2b so as to be in a mutually conductive state.

Furthermore, a commercial frequency or high frequency AC or pulse high voltage power source 7 is connected between the discharge electrode 2 and the induction electrode 3, and a high voltage of about 4 to 8 kV applied from this high voltage power source 7 causes the cylinder to A creeping silent discharge is generated on the inner surface of the shaped dielectric 1, and ozone is generated from the air or pure oxygen flowing therethrough.

Furthermore, cap-shaped end plates 9 and 10 made of an insulator in this example are attached to both ends of the cylindrical dielectric body 1 with metal mounting bolts 8, and the cylindrical dielectric body 1 and the end plates 9 and 10 at both ends are attached. This makes up the ozonizer casing, making it possible to omit a dedicated casing.

The end plates 9 and 10 are formed with an air inlet 11 and an ozone outlet 12, respectively, and an outer side 12 of the end plates 9 and 10 is formed.
are provided with housings 14 and 14a, respectively, and a high voltage power source 7 is installed in the housing 14.
A high-voltage cable 15 that interconnects the discharge electrode 2 and the discharge electrode 2 is soldered 19 to a circular plate 19 at the left end of the mounting bolt 8.
connected by a. Further, a radial lead wire 31 is protruded from the mounting bolt 8, and this contacts any one of the discharge electrodes 2, and connects all the discharge electrodes 2.
Power is supplied to the rings 2a and 2b through the rings 2a and 2b. Further, a tightening nut 20 is provided inside the housing 14a at the right end of the mounting bolt, and an insulating cap 20a is fitted to the outside of the housing 14a via a thread groove. Further, elastic packing 1 such as rubber is provided between both ends of the cylindrical dielectric body 1 and each end plate 9, 10.
6, 17, and elastic washers 21, 22 made of rubber or the like are interposed between the disc 19 and nut 20 at both ends of the mounting bolt 8 and the end plates 9, 10, and both the cylindrical dielectric 1 This is to alleviate the thermal stress that occurs in each part when the cylindrical dielectric material expands and contracts in its length direction due to heat, and also to reduce the necessity for circularity of the cylindrical dielectric material 1 and perpendicularity of each end surface thereof. It is.

Furthermore, FIG. 3 shows a pattern in which the other side of the metal strip 5 on which the brush-like fins 4 are formed is wound around the outer surface of the cylindrical dielectric 1 in a coil shape. As shown in FIG. 4, a strip-shaped thin metal plate made of aluminum or the like is bent on both sides to form a groove-shaped cross section 5a.
The brush-like fins 4 are formed by making a large number of cuts 5c in both sides 5b of the groove 5a, and the bottom piece 5d of the groove 5a is connected to the contact surface with the outside of the cylindrical dielectric 1. It is something to do.

In the present invention configured in this manner, the air or oxygen supplied from the air inlet 11 is ozonized by the creeping silent discharge described above while it exits from the ozone outlet 12, but the heat generated at that time is Cylindrical dielectric 1
There is no risk of decomposing the ozone that is efficiently cooled and generated by cooling fins 6 provided on the outside of the cooling fins 6, and in particular, the cooling fins 6 form brush-like fins 4 on one side of the metal strip 5 in a coil shape. When the metal strip 5 is wound around the metal strip 5, the other side surface of the metal strip 5 is pressed against the outer surface of the cylindrical dielectric body 1, improving cooling efficiency, and there is no possibility that a gap will be formed between the metal strips and hinder heat conduction.

Furthermore, the manufacturing cost for the configuration of the cooling fins 6 is extremely low.

Although the present invention has been described above with reference to FIGS. 1 to 4, the present invention is not limited to what is shown in each of these drawings, but can also be implemented by the following embodiments. It is.

For example, the cooling fins 6 in FIG.
What is shown in FIG. 5 is a large number of thin plate-like fins 6a extending in the longitudinal direction of the cylindrical dielectric 1, and the spacing between them is maintained by a connecting piece 26. In addition, in this drawing, the parts having the same drawing numbers as in FIG. 1 also have the same part names.

The cooling fins 6b shown in FIGS. 7 and 8 are composed of a large number of ring-shaped fins 4b arranged in a direction perpendicular to the longitudinal direction of the cylindrical dielectric 1, and the intervals between the ring-shaped fins 4b are set by connecting pieces. It is kept constant at 27.

The induction electrode 3 in the embodiment shown in FIG. 1 is buried within the thickness of the cylindrical dielectric 1, but the induction electrode 3 in
It may be provided on the outer surface of the cylindrical electrode as shown in b.

In the embodiment shown in FIG. 1, the mounting bolt 8 is attached to the cylindrical dielectric
However, the one shown in FIG. 7 is provided with a plurality of them concentrically on the outside of the cylindrical dielectric 1. Note that the end plates 9a and 9b that are crimped to both ends of the cylindrical dielectric body 1 in FIGS. 7 and 8 are similar to those in FIG. There is a difference between 1st in the figure
The names of parts that are the same as the drawing numbers in the figures are also the same.

The mounting bolts 8 shown in Figures 1 and 7 may be made of a conductive material such as metal or a poor conductor material such as synthetic resin, but in particular, if they are made of a poor conductor material, the bolts 8 shown in Figure 9 As shown, an insertion hole 28 is bored at one end of the tightening bolt 8a, and a cable 29 is inserted into it.
Insert the lead wire 3 into the center of the tightening bolt 8a.
A plurality of lead wires 31 are connected radially to the tip of this lead wire 30 as shown in FIG. Can be connected. In this case, the power supply structure is simplified. Alternatively, as shown in FIG. 11, the mounting bolt 8 can be made into a cylinder, through which air or oxygen can be introduced and ozone can be discharged. In addition, in Figures 9, 10 and 11,
The parts having the same drawing numbers as in FIG. 1 have the same names. The ozone generator according to the present invention is a so-called creeping discharge type ozone generator in which the discharge electrode and the induction electrode are in close contact with the cylindrical dielectric. There are no gaps between the electrodes. Therefore, heat from the outside of the dielectric is directly transmitted to the inside without being blocked by air or the like. Therefore, when the outer surface of the cylindrical dielectric is cooled by the cooling fins, the cold heat is directly transmitted to both electrodes, so that the cooling efficiency is significantly improved compared to the conventional example.

Further, the ozone generator of the present invention has a simple structure and is easy to manufacture, so the manufacturing cost can be significantly reduced compared to the conventional example.

[Brief explanation of drawings]

FIG. 1 is a longitudinal sectional view of an ozone generator showing an embodiment of the present invention, FIG. 2 is a sectional view taken along the line - in FIG. 1, and FIG. 3 is a perspective view of a part of the manufacturing process shown in FIG. Figure 4 is an enlarged slope view of a portion of Figure 3;
The figure is a sectional view of another embodiment of the part shown in FIG. 2, and FIG. 6 is a sectional view of another embodiment of the part shown in FIG. 2.
FIG. 7 is a longitudinal sectional view of another embodiment of the portion shown in FIG. 1;
8 is a sectional view taken along the line - in FIG. 7, FIG. 9 is a vertical sectional view of still another embodiment of the portion shown in FIG.
0 is a sectional view taken along the line -- in FIG. 9, and FIG. 11 is a longitudinal sectional view of yet another embodiment. DESCRIPTION OF SYMBOLS 1... Cylindrical dielectric, 2... Discharge electrode, 3... Induction electrode, 4... Brush-like fin, 5... Metal band, 6
... Cooling fin, 7 ... High voltage power supply, 8 ... Mounting bolt, 9 ... End plate, 10 ... End plate, 11 ... Air inlet, 12 ... Ozone outlet, 16 ... Elastic packing, 17 ... Elastic packing.

Claims (1)

[Claims] 1. A discharge electrode is provided on the inner surface of a cylindrical dielectric, and an induction electrode is provided on the outside of the discharge electrode via the dielectric,
An ozone generator in which the induction electrode and the dielectric are brought into close contact with each other, wherein cooling fins are provided on the outer surface of the cylindrical dielectric. 2. The cooling fin is a metal band with a groove-shaped cross section,
Claims characterized in that the groove-shaped bottom piece is formed into a brush shape by making a number of cuts on both sides of the groove, and the groove-shaped bottom piece is wound around the outer surface of the cylindrical dielectric body in a coil shape. The ozone generator described in Section 1. 3. The ozone generator according to claim 1, wherein the cooling fins are elongated plate-like fins provided in plurality in the longitudinal direction of the dielectric. 4. The ozone generator according to claim 1, wherein the cooling fins are a plurality of ring-shaped fins provided in a direction perpendicular to the longitudinal direction of the dielectric. 5. The ozone generator according to claim 1, wherein the induction electrode provided outside the discharge electrode is embedded within the thickness of the dielectric. 6. The ozone generator according to claim 1 or 2, wherein the induction electrode provided outside the discharge electrode is formed on the outer surface of the dielectric. 7. The ozone generator according to claim 1, wherein the cylindrical dielectric is crimped at both ends to the end plate with mounting bolts via elastic packing. 8. Claims characterized in that the end plate crimped to one end of the cylindrical dielectric body forms an air inlet, and the end plate crimped to the other end forms an ozone gas outlet. The ozone gas generator described in item 7. 9. The ozone generator according to claim 7, wherein the mounting bolt is provided at the axis of the cylindrical dielectric. 10 The mounting bolt is provided at the axis of the cylindrical dielectric body, is made of metal, and has a plurality of radial lead wires protruding thereon, and the tips of the radial lead wires are connected to the discharge electrode. 8. The ozone gas generator according to claim 7, wherein the end plate is made of an insulator, and one end of the metal mounting bolt is connected to a cable. 11 The mounting bolt is provided at the axis of the cylindrical dielectric, which is made of a dielectric, and a cable and a lead wire connected to the cable are provided at the center of one end of the bolt, and a lead wire is provided at the tip of the lead wire. 8. The ozone generator according to claim 7, wherein a plurality of radial lead wires are provided in a protruding manner, and the tips of the radial lead wires are connected to a discharge electrode. 12. The ozone generator according to claim 7, wherein a plurality of the mounting bolts are provided concentrically on the outside of the cylindrical dielectric.