JP6871038B2 - Discharge lamp, ozone generator and ozone generation method - Google Patents

Description

The present invention relates to a discharge lamp such as an excimer lamp, and more particularly to a lamp configuration optimal for an ozone generator.

In excimer lamps, electrode pairs are placed on the outer surface of the discharge container, and rare gas is sealed in the discharge container. By applying a voltage between the electrodes, dielectric barrier discharge occurs, and the discharge container moves out of the lamp. It emits ultraviolet rays toward it. Since ozone generated by ultraviolet irradiation has a sterilizing ability (oxidizing power), an excimer lamp can be used as a light source for a deodorizing device, a sterilizing / sterilizing device, and the like.

For example, two excimer lamps are placed in a container, and the first excimer lamp irradiates ultraviolet rays to generate ozone, and the second excimer lamp irradiates ultraviolet rays of different wavelengths to generate active oxygen. (See Patent Document 1).

Japanese Unexamined Patent Publication No. 2002-316041

When sterilizing, deodorizing, etc., the minimum amount (concentration) of ozone may be generated according to the range in which the effects such as sterilization and deodorizing are required. Therefore, an ozone generator capable of changing the amount (concentration) of ozone generated depending on an object such as deodorization or sterilization is desired. However, in order to change the amount (concentration) of ozone generated, a complicated lamp blinking control circuit is required, so that the ozone generation device cannot be miniaturized.

Therefore, a discharge lamp such as a small excimer lamp, which can be applied to ozone generators having different amounts (concentrations) of ozone generated and has a simple configuration and is versatile, is required.

The discharge lamp of the present invention includes a tubular discharge container filled with discharge gas and a pair of electrodes facing each other along the radial direction of the discharge container and arranged along the outer surface of the discharge container. For example, the discharge gas is a rare gas defined in the range of 0.1 kPa to 20 kPa, and the outer diameter of the discharge container can be defined in the range of 3 mm to 10 mm.

In the present invention, the outer surface of the discharge container is in contact with the pair of electrodes so that the ultraviolet rays radiated from the discharge locally generated in the discharge container are irradiated to the outside of the discharge container. Here, the “locally generated discharge” refers to a discharge that is biased toward a portion other than the central axis in contact with the discharge container in the radial direction.

For example, at least one of the pair of electrodes is arranged at a position facing a spatial region in which a strong discharge is biased in the axial direction or the radial direction of the discharge container. Further, the pair of electrodes can be gripped by line contact or point contact in the axial direction with respect to the outer peripheral surface of the discharge container, so that the discharge container can be exchanged.

The ozone generator according to another aspect of the present invention includes a tubular discharge container filled with discharge gas, and is radiated from a locally generated discharge in the discharge container according to the axial length of the discharge container. Ozone is generated by the ultraviolet rays. For example, a pair of electrodes facing each other along the radial direction of the discharge container are arranged along the outer surface of the discharge container, depending on the axial length in which the outer surface of the discharge container is in contact with the pair of electrodes. , Ozone is generated.

In another aspect of the present invention, in the ozone generation method, a pair of electrodes facing each other along the radial direction of a tubular discharge container filled with a discharge gas are arranged so as to be in contact with the outer surface of the discharge container. By applying a high-frequency voltage between the pair of electrodes, the ultraviolet rays radiated from the discharge generated in the discharge vessel are irradiated to the outside of the discharge vessel according to the axial length of the pair of electrodes facing each other, and ozone is applied. To generate.

According to the present invention, it is possible to provide an optimum lamp configuration for a small ozone generator.

It is a schematic side view of the discharge lamp. It is a top view seen from the end side of a discharge lamp. It is a schematic sectional view of the discharge lamp along the line AA'in FIG.

Hereinafter, the discharge lamp according to the embodiment of the present invention will be described with reference to the drawings.

FIG. 1 is a schematic side view of a discharge lamp. FIG. 2 is a schematic front view seen from the end side of the discharge lamp. FIG. 3 is a schematic cross-sectional view of the discharge lamp along the lines AA'of FIG.

The discharge lamp 10 is provided with a tubular discharge container 20 having a discharge space S formed therein and formed of quartz glass or the like, and a pair of electrodes 30 and 40 are provided between both ends 20T1 and 20T2. .. The pair of electrodes 30 and 40 extend along substantially the entire discharge container 20 along the axial direction X of the discharge container, and have different polarities from each other. As shown in FIG. 1, the pair of electrodes 30 and 40 have the same shape, are arranged so as to face each other in the radial direction, and are in line contact with the discharge container 20.

The discharge lamp 10 is configured here as an excimer lamp provided with a small-diameter discharge container, the outer diameter D of the discharge container 20 is in the range of 3 mm to 10 mm, and the axial length W of the discharge container is 10 mm or more. It is possible to set each in the range of.

The discharge space S of the discharge container 20 is filled with xenon gas 1 Torr to 150 Torr (0.1 kPa to 30 kPa, more preferably 7 kPa to 20 kPa). A pair of conducting wires (not shown) connected to a DC power supply unit (not shown) are connected to the pair of electrodes 30 and 40, and a high frequency (1 kHz to 500 kHz) is connected between the pair of electrodes 30 and 40. More preferably, it is in the range of 1 kHz to 100 kHz, and a high voltage (5 kV to 10 kV) of, for example, 60 kHz) is applied. Although the discharge container 20 is gripped by a pair of electrodes 30 and 40, it may be held by a holding member (not shown).

As shown in FIG. 2, each of the pair of electrodes 30 and 40 is configured as a flat plate-shaped electrode, and is held by a holding member (not shown). Further, the pair of electrodes 30 and 40 are in line contact with the outer peripheral surface 20S of the discharge container 20 at the contact portions L1 and L2, and are symmetrically arranged by the axis of symmetry Y passing through the axial direction X of the discharge container. A gap 50 is formed in a portion where the discharge container 20 and the pair of electrodes 30 and 40 do not come into contact with each other. Although the wall thickness portion of the discharge container 20 is omitted in FIG. 2, the wall thickness can be set in the range of 0.2 mm to 4 mm (for example, 1.5 mm).

When a voltage is applied to such a pair of electrodes 30 and 40, a dielectric barrier discharge is generated in the discharge container 20, and ultraviolet rays are radiated to the outside of the discharge container 20. The electric field is concentrated on the contact portion L, a strong discharge is locally generated in the vicinity of the contact portion L in the discharge container 20, and the illuminance of the emitted ultraviolet rays is high. On the other hand, in the vicinity of the axis of symmetry Y of the pair of electrodes 30 and 40 in the discharge container 20 (near the center between the electrodes 30 and 40), the illuminance of the emitted ultraviolet rays is low (the discharge is weak). The gap 50 formed between the pair of electrodes 30 and 40 and the discharge container 20 is an insulated space region that does not discharge. Further, since the pair of electrodes 30 and 40 are in line contact with the discharge container 20, gas inflow and ozone outflow are facilitated, and ozone is generated in the vicinity of the outer peripheral surface of the discharge container 20.

FIG. 3 is a schematic cross-sectional view of the discharge lamp along the lines AA'of FIG.

As shown in FIG. 3, a weak discharge CC occurs in the spatial region near the central axis X passing through the symmetry axis Y of the pair of electrodes 30 and 40. On the other hand, a strong discharge CC is generated in the spatial region near the contact portion L in contact with the pair of electrodes 30 and 40. In the discharge container 20, the discharge state is different between the space region near the electrodes 30 and 40 and the space region near the axis of symmetry Y which is the center between the electrodes 30 and 40, and the discharge is caused by the discharge container 20. Due to the bias toward both regular surfaces (electrode side), local discharge occurs in the discharge container 20.

In the discharge container 20, discharge occurs in the axial range held by the pair of electrodes 30 and 40 facing each other. Therefore, by selecting the axial length of the discharge container 20, it is localized in the discharge container 20. The irradiation range (amount of ozone produced) of ultraviolet rays radiated from the discharge generated in is adjustable. For example, by attaching (grasping) a discharge container in which the lengths of both ends 20T1 and 20T2 are shorter in the axial direction than the range in which the pair of electrodes 30 and 40 face each other, the ultraviolet irradiation range (amount of ozone generated). Becomes smaller. On the other hand, by lengthening the discharge container in the axial direction, the ultraviolet irradiation range (amount of ozone produced) can be increased. In addition to this, discharge containers having different inner and outer diameters may be used, and the amount of ozone generated (concentration) can be adjusted by changing the type (mixing ratio) and amount (pressure) of the gas sealed in the discharge container. You may.

Since the pair of electrodes 30 and 40 are in line contact with the discharge container 20, the discharge container can be easily replaced. By replacing the discharge container with a discharge container having different specifications (shape, enclosed gas pressure, etc.), the irradiation range of ultraviolet rays can be obtained. (Amount of ozone produced) can be changed.

As described above, according to the present embodiment, in the discharge lamp 10 provided with the discharge container 20, local discharge is performed in the discharge container 20 according to the axial length in which the discharge container 20 is in contact with the pair of electrodes 30 and 40. Can be generated, and the range of irradiation with ultraviolet rays can be adjusted. As a result, the amount of ozone generated (concentration) can be easily changed even though the configuration is simple.

In the present embodiment, the electrode pair is a flat conductive member, but the electrode may have a V-shaped cross section or a semicircular cross section, and is irradiated with ultraviolet rays by making line contact or point contact with the discharge container. It is possible to change the range (amount of ozone produced).

10 Discharge lamp 20 Discharge container 30 Electrode 40 Electrode 50 Gap (space)

Claims (7)

A tubular discharge container filled with discharge gas and
A pair of electrodes facing each other along the radial direction of the discharge vessel and arranged along the outer surface of the discharge vessel.
A discharge lamp in which the pair of electrodes are in line contact or point contact in the axial direction with respect to the outer peripheral surface of the discharge container. The discharge according to claim 1, wherein at least one of the pair of electrodes is arranged at a position facing a space region in which a strong discharge is generated unevenly in the axial direction or the radial direction of the discharge container. lamp. The discharge lamp according to claim 1 , wherein the pair of electrodes are gripped by line contact or point contact in the axial direction with respect to the outer peripheral surface of the discharge container, and the discharge container is replaceable. .. The discharge gas is a rare gas defined in the range of 0.1 kPa to 20 kPa.
The outer diameter of the discharge vessel, discharge electric lamp according to any one of claims 1 to 3, characterized in that in the range of 3 mm to 10 mm. A tubular discharge container filled with discharge gas and
It comprises a pair of electrodes that face each other along the radial direction of the discharge vessel and are arranged along the outer surface of the discharge vessel .
The pair of electrodes make axial line contact or point contact with the outer peripheral surface of the discharge container.
Ozone generating apparatus characterized by ozone Ri by the ultraviolet rays emitted from the locally resulting discharge is generated in the discharge vessel. Depending on the axial length of the outer surface before Symbol discharge vessel is in line contact with the pair of electrodes, the ozone generating apparatus according to claim 5, characterized in that the ozone is generated. A pair of electrodes facing each other along the radial direction of the tubular discharge container filled with the discharge gas are arranged so as to make linear contact with the outer surface of the discharge container in the axial direction.
By applying a high-frequency voltage between the pair of electrodes, the discharge generated in the discharge container depends on the axial length in which the outer surface of the discharge container is in line contact with the pair of electrodes. A method for generating ozone, which comprises irradiating the outside of the discharge container with ultraviolet rays emitted from the discharge container to generate ozone.

Images