JPH1012197A - Electrodeless discharge lamp, electrodeless discharge lamp device, electrodeless discharge lamp lighting device, ultraviolet irradiation device and fluid treatment device - Google Patents

Abstract

(57) [Problem] To efficiently emit ultraviolet rays from an electrodeless discharge lamp. SOLUTION: The temperature of the coldest part of the envelope 2 of the discharge lamp 1 is set in the range of 56 to 66 degrees Celsius.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an electrodeless discharge lamp, an electrodeless discharge lamp device, an electrodeless discharge lamp lighting device, an ultraviolet irradiation device and a fluid treatment device using the same, and more particularly to a sterilization system used in a sterilization system. The present invention relates to an electrodeless discharge lamp and the like, which enhances the effect and greatly improves the service life of the system.

[0002]

2. Description of the Related Art As a conventional sterilizing system for circulating bath water, for example, the one shown in FIGS. 6 to 8 is known. These sterilize water flowing in the sterilization tank by ultraviolet rays emitted from an ultraviolet radiation lamp.

[0003] In the conventional example shown in FIG. 6, an arc tube 102 radiating ultraviolet rays in the axial direction is provided at the center of a substantially cylindrical sterilization tank 101.
Is arranged. A water inlet 103 is provided on the upper side surface of the sterilization tank 101, and a water outlet 104 is provided on the bottom surface of the sterilization tank 101. A lid 105 is screwed on the upper end surface of the sterilization tank 101, and a rubber waterproof plate 106 is mounted between the upper end surface of the sterilization tank 101 and the inner surface of the lid 105.

[0004] A quartz outer tube 107 is concentrically arranged on the outer periphery of the arc tube 102, and the upper end of the quartz outer tube 107 has a lid 1.
05. The lower end of the quartz outer tube 107 is sealed. Further, electrodes 108 and 109 are provided at both ends of the arc tube 102, respectively.
Is connected to a power supply (not shown).

[0005] In the fluid treatment apparatus in the conventional sterilization system configured as described above, water flowing into the sterilization tank 101 from the water inlet 103 flows around the quartz outer tube 107 and is discharged from the water outlet 104. . During this time, the arc tube 1
Water sterilization is performed by ultraviolet rays radiated from 02.
At this time, since the arc tube 102 is formed in a long columnar shape, the ultraviolet rays are emitted almost uniformly, and uniform sterilization is performed.

In the conventional example shown in FIGS. 7 and 8, a water channel 202 formed of quartz glass which penetrates the center of a rectangular box-shaped lamp body 201 and transmits infrared rays is disposed, and a water channel 20 is provided.
Arc tubes 203 parallel to water channel 202 on both sides of
204 is provided. Reflecting plates 205 and 206 are disposed around the outer circumferences of the arc tubes 203 and 204, respectively, and the ultraviolet rays radiated from the arc tubes 203 and 204 pass through the water channel 2.
02 is reflected.

[0007] The fluid treatment apparatus in the conventional sterilization system configured as described above can also uniformly sterilize the water flowing in the water channel 202 as in the case of the conventional example shown in FIG.

In the conventional example shown in FIGS. 9 and 10, arc tubes 102 and 203 having electrodes at both ends shown in FIGS.
An inductively coupled electrodeless discharge lamp 301 is provided in place of 204. The electrodeless discharge lamp 301 is formed of a transparent material such as quartz glass in a closed cylindrical shape, and has a discharge medium made of mercury and a rare gas sealed therein. An excitation coil 302 is wound around the outer periphery of the electrodeless discharge lamp 301, and the excitation coil 302 is connected to a high-frequency power source (not shown). The electrodeless discharge lamp 301 is inserted into a sterilization tank 303 having the same structure as that of the conventional example shown in FIG. Then, by passing a high-frequency current through the excitation coil 302, ultraviolet light is output from the electrodeless discharge lamp 301.

The excitation coil 302 is an electrodeless discharge lamp 30
In the conventional example shown in FIG. 9, the electrodeless discharge lamp 301 is wound in the water flowing in the sterilization tank 303.
It is soaked with. In the conventional example shown in FIG. 10, the center of the sterilization tank 303 is formed in a concave shape made of quartz glass or the like, and the electrodeless discharge lamp 301 around which the excitation coil 302 is wound is disposed in the concave section 304. 303
It does not come into direct contact with the water inside.

[0010]

In the conventional examples shown in FIGS. 6 to 8, since the arc tube is provided with electrodes,
There is a problem that the life is shortened due to the consumption of the electrodes.
In the conventional examples shown in FIGS. 9 and 10, the electrodeless discharge lamp is used instead of the arc tube, so that the life can be extended.

The luminous tube used in the conventional sterilization system shown in FIGS. 6 to 8 is heated entirely by the emission of ultraviolet rays due to the discharge between the electrodes, and the coldest part is determined. However, in the electrodeless discharge lamps shown in FIGS. 9 and 10, heating due to resistance loss of the excitation coil and heating due to heat generation of the coil caused by shading of the excitation coil are added. Therefore, the temperature of the arc tube near the excitation coil tends to rise excessively. Therefore, in order to keep the coolest part at an optimum temperature, it is necessary to provide the coolest part in a part away from the excitation coil.
If the temperature of the coldest part is not properly maintained, the radiation efficiency of ultraviolet rays is reduced.

On the other hand, winding the excitation coil over the entire length of the lamp is more advantageous for emitting light over the entire length of the lamp. For this reason, there is a problem that it is difficult to optimize the coldest part temperature in the electrodeless discharge lamp as compared with the conventional lamp.

SUMMARY OF THE INVENTION The present invention has been made in view of the above circumstances, and it is an electrodeless discharge lamp capable of extending the life of a discharge lamp and obtaining a stable ultraviolet output with high ultraviolet radiation efficiency. Electrodeless discharge lamp device using lamp, electrodeless discharge lamp lighting device for lighting this electrodeless discharge lamp device, ultraviolet irradiation device using this electrodeless discharge lamp device and lighting device, fluid treatment having this ultraviolet irradiation device It is intended to provide a device.

[0014]

According to a first aspect of the present invention, there is provided an electrodeless discharge lamp comprising: an envelope; a discharge medium which is enclosed in the envelope and emits ultraviolet rays by discharging; And a coldest portion of 56 to 66 degrees Celsius formed in the envelope.

In the electrodeless discharge lamp according to the second aspect of the present invention, the coldest part has a temperature of 57 to 62 degrees Celsius.

In the electrodeless discharge lamp according to the third aspect of the present invention, the coldest part has a temperature of 58 to 61 degrees Celsius.

According to a fourth aspect of the present invention, in the electrodeless discharge lamp, a projection forming the coldest portion is provided in the envelope.

According to a fifth aspect of the invention, there is provided an electrodeless discharge lamp including a holding means for holding the coldest part within a predetermined temperature range.

According to a sixth aspect of the present invention, in the electrodeless discharge lamp, the holding means has a control means for controlling the coldest part within a predetermined temperature range.

According to a seventh aspect of the present invention, in the electrodeless discharge lamp, the holding means is an electric heat insulating member for holding the coldest part within a predetermined temperature range.

According to an eighth aspect of the present invention, in the electrodeless discharge lamp, the holding means is a constant temperature body or a heat keeping body for keeping the coldest part within a predetermined temperature range.

According to a ninth aspect of the present invention, the vapor pressure of the discharge medium containing mercury is 0.1 Torr to 9 TOR.
RR.

According to a tenth aspect of the present invention, an electrodeless discharge lamp device includes the electrodeless discharge lamp according to any one of the first to ninth aspects, and an excitation coil wound along an envelope. .

An electrodeless discharge lamp lighting device according to an eleventh aspect of the present invention includes the electrodeless discharge lamp device according to the tenth aspect, and lighting means for applying a high-frequency voltage to an excitation coil.

According to a twelfth aspect of the present invention, an ultraviolet irradiation apparatus includes the electrodeless discharge lamp device according to the tenth aspect and the electrodeless discharge lamp lighting device according to the eleventh aspect.

According to a thirteenth aspect of the present invention, there is provided a fluid processing apparatus including a fluid to be processed, and a fluid processing unit to which the fluid flows in and out and to which the ultraviolet irradiation device according to the twelfth aspect is mounted.

In each of the above inventions, since the electrodeless discharge lamp is used, the lamp life can be extremely extended. On the other hand, according to the experimental results of the present inventors, several tens w
It has been found that in the inductively coupled electrodeless discharge lamp of (1), when the vapor pressure of the discharge medium is 0.1 TOR to 9.0 TOR, the coldest part temperature is 56 to 66 degrees Celsius and the ultraviolet radiation efficiency is the highest. In each of the above inventions, since the coldest part is formed in the envelope of the electrodeless discharge lamp so as to be at least within the above-mentioned temperature range, it is possible to efficiently emit ultraviolet rays.

[0028]

Embodiments of the present invention will be described below with reference to the drawings. FIG. 1 is a diagram showing the relationship between the coldest part temperature of the electrodeless discharge lamp and the ultraviolet radiation efficiency based on the results of experiments conducted by the present inventors. As is clear from FIG. 1, when the minimum temperature is 56 to 66 degrees Celsius, the ultraviolet radiation efficiency is 90% or more, and when the temperature is 57 to 62 degrees Celsius, the ultraviolet radiation efficiency is 9%.
3% or more, and 96% or more at 58 to 61 degrees Celsius.

FIG. 2 is an explanatory view showing the structure of the first embodiment of the ultraviolet irradiation apparatus of the present invention. In FIG. 2, an envelope 2 of the electrodeless discharge lamp 1 is formed of a quartz or ceramic which transmits ultraviolet rays in a closed cylindrical shape. A discharge medium such as an Ar gas containing mercury is sealed in the envelope 2, and a plurality of, for example, 12 to 24 excitation coils 3 formed of a conductor are wound around the outer periphery of the envelope 2. Has been turned.

Both ends of the excitation coil 3 are connected to a commercial power supply 6 (for example, 100 V and 50 cycles) via a matching circuit 4 and a RP switch circuit 5 as lighting means. The current supplied from the power source 6 is converted to a high frequency by the RP switch circuit 5, impedance matching with the excitation coil 3 is achieved by the matching circuit 4, and the high frequency power is effectively transmitted to the discharge lamp 1. ing.

When high-frequency power is supplied to the excitation coil 3, the discharge medium enclosed in the envelope 2 of the discharge lamp 1 emits ultraviolet rays by discharge. Since the ultraviolet radiation has a discharge shape close to the tube surface, that is, a donut shape, the ultraviolet radiation is effectively radiated out of the tube. At this time, the high frequency is usually several hundred KHz to several + MHZ.

A coldest portion is formed at the end of the envelope 2 farthest from the excitation coil 3. At this end, an electric heat insulating member 7 as a holding means for holding the coolest part temperature at 56 to 66 degrees Celsius is mounted. The heating element 7 is filled with a heating wire, and the heating wire is heated by the power supply 8. Further, a temperature detecting section 9 for detecting the temperature is connected to the electric heat insulating member 7, and the temperature detected by the temperature detecting section 9 is transmitted to the control section 10. The control unit 10 controls the voltage of the power supply 8 for heating the electric heat insulating member 7, and keeps the electric heat insulating member 7 in the above-mentioned predetermined temperature range.

According to the present embodiment, even if the temperature of the coldest part is lowered due to external conditions, the temperature can always be maintained at a predetermined 55 to 65 degrees Celsius by the electric heat holding member 7, and a stable ultraviolet ray can be obtained. You can get the output.

The temperature of the coldest part may be generally 56 to 66 degrees Celsius, preferably 57 to 62 degrees Celsius, and the optimum temperature is 58 to 61 degrees Celsius.
It is better to set the temperature range in this way. In addition, if the external conditions are constant and the temperature of the coldest part is constant, the electric heat insulation member 7 may be kept at a constant temperature, and there is no need for control.

FIG. 3 is an explanatory view showing the configuration of a second embodiment of the ultraviolet irradiation apparatus of the present invention. FIG. 3 shows an example in which an electric heating member 11 is provided at the coldest portion at the end of the envelope 2 and the electric heating member 11 is connected to a constant temperature body 12 such as a housing.
With this structure, it is also possible to maintain the temperature of the coldest part within a predetermined temperature range.

FIG. 4 is an explanatory view showing the configuration of a third embodiment of the ultraviolet irradiation apparatus of the present invention. FIG. 4 shows a case where a heat insulator 21 such as alumina or glass wool is attached to the coldest portion at both ends of the envelope 2. According to this structure, it is possible to prevent the temperature of the coldest part from lowering and to keep the temperature in a predetermined temperature range.

FIG. 5 is an explanatory view showing the configuration of a fourth embodiment of the ultraviolet irradiation apparatus of the present invention. The one shown in FIG. 5 is one in which the coldest part at the end of the envelope 2 is made to protrude to form a protruding part 31. According to this structure, when the temperature of the coldest part is too high, it is possible to lower the temperature by bringing the coldest part into contact with the outside air via the protruding part 31 and keep the temperature in a predetermined temperature range.

The above-described ultraviolet irradiation apparatus is effective when provided in a fluid processing apparatus for sterilizing a liquid or the like, but the same effect can be obtained when applied to the case where ultraviolet irradiation is performed for another purpose. . The same effect can be obtained by applying the present invention to a single electrodeless discharge lamp or an electrodeless discharge lamp device.

[0039]

According to the first to third aspects of the present invention, since the coldest part in the temperature range of at least 56 to 66 degrees Celsius is formed in the envelope of the electrodeless discharge lamp, the ultraviolet radiation efficiency is increased. And a stable ultraviolet output can be obtained.

According to the fourth aspect of the present invention, since the projecting portion is provided at the coldest portion of the envelope, overheating of the coldest portion can be prevented.

According to the fifth to ninth aspects of the present invention, since the holding means for holding the coldest portion formed in the envelope within a predetermined temperature range is provided, the coldest portion is prevented from overheating and overcooling. It can be kept in the temperature range.

According to the tenth to thirteenth aspects of the present invention, there is provided an electrodeless discharge lamp device, an electrodeless discharge lamp lighting device, an ultraviolet irradiation device, and a fluid treatment using the electrodeless discharge lamp according to any one of the first to ninth aspects. Since the devices are configured, the ultraviolet radiation efficiency of each device can be increased.

[Brief description of the drawings]

FIG. 1 is a diagram showing characteristics of an ultraviolet radiation efficiency of an electrodeless discharge lamp of the present invention.

FIG. 2 is an explanatory view showing the configuration of a first embodiment of the ultraviolet irradiation device of the present invention.

FIG. 3 is an explanatory view showing a configuration of a second embodiment of the ultraviolet irradiation apparatus of the present invention.

FIG. 4 is an explanatory diagram showing a configuration of a third embodiment of the ultraviolet irradiation device of the present invention.

FIG. 5 is an explanatory diagram showing a configuration of a fourth embodiment of the ultraviolet irradiation device of the present invention.

FIG. 6 is a longitudinal sectional view showing a configuration of a first example of a conventional fluid processing apparatus.

FIG. 7 is a longitudinal sectional view showing a configuration of a second example of the conventional fluid processing apparatus.

FIG. 8 is a sectional view taken along line AA of FIG. 7;

FIG. 9 is a longitudinal sectional view showing a configuration of a third example of the conventional fluid processing apparatus.

FIG. 10 is a longitudinal sectional view showing the configuration of a fourth example of the conventional fluid processing apparatus.

[Explanation of symbols]

REFERENCE SIGNS LIST 1 wireless electrode discharge lamp 2 envelope 3 excitation coil 4 matching circuit (lighting means) 5 RP switch circuit (lighting means) 7 electric heat insulation member 10 control unit (control means) 12 constant temperature body 21 heat insulation body 31 protrusion

Claims (13)

[Claims] 1. An envelope; a discharge medium containing mercury which is enclosed in the envelope and emits ultraviolet rays when discharged; and a coldest of 56 to 66 degrees Celsius formed in the envelope. And an electrodeless discharge lamp. 2. The electrodeless discharge lamp according to claim 1, wherein the coldest part is at 57 to 62 degrees Celsius. 3. The electrodeless discharge lamp according to claim 1, wherein the coldest part has a temperature of 58 to 61 degrees Celsius. 4. The electrodeless discharge lamp according to claim 1, wherein a protrusion forming the coldest part is provided on the envelope. 5. The electrodeless discharge lamp according to claim 1, wherein holding means for holding the coldest part within a predetermined temperature range is provided in the envelope. 6. The electrodeless discharge lamp according to claim 5, wherein said holding means has a control means for controlling said coldest part within a predetermined temperature range. 7. The electrodeless discharge lamp according to claim 5, wherein said holding means is an electric heat insulating member for holding said coldest part within a predetermined temperature range. 8. The electrodeless discharge lamp according to claim 5, wherein said holding means is a constant temperature body or a heat keeping body for keeping said coldest part within a predetermined temperature range. 9. The vapor pressure of a discharge medium containing mercury is 0.1 T
2. The method according to claim 1, wherein the ORR is from 9 torr.
An electrodeless discharge lamp as described. 10. An electrodeless discharge lamp device, comprising: the electrodeless discharge lamp according to claim 1; and an excitation coil wound along an envelope. . 11. An electrodeless discharge lamp device according to claim 10, and lighting means for applying a high-frequency voltage to an excitation coil.
An electrodeless discharge lamp lighting device comprising: 12. The electrodeless discharge lamp device according to claim 10, and the electrodeless discharge lamp lighting device according to claim 11.
An ultraviolet irradiation device, comprising: 13. A fluid processing apparatus comprising: a fluid to be processed; and a fluid processing unit to which the fluid flows in and out and to which the ultraviolet irradiation device according to claim 12 is mounted.