JP2009289526A - Ultraviolet ray irradiation device - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To aim at longer life of a magnetron by improving its cooling efficiency for generating ultraviolet rays by exciting an electrodeless lamp. <P>SOLUTION: The electrodeless lamp 12 where a discharge medium is enclosed, capable of emitting ultraviolet rays on the basis of the microwaves from magnetrons 131, 132 for generating microwaves and through waveguides 151, 152 is formed in a lamp house 11. The magnetrons 131, 132 and the electrodeless lamp 12 in the case 11 are cooled by a cooling mechanism 20 mainly formed by a fan. The ultraviolet rays of the lamp emitted from the electrodeless lamp 12 are collected or diffused by using a reflecting plate 21 to an irradiated object. A plurality of cooling holes with an approximate size where microwaves are not leaked are formed on the waveguides 151, 152, shapes of the cooling holes in the vicinity of the magnetrons 131, 132 are set up to be large cooling hole section 231, 232, and the shapes of the cooling holes in the vicinity of the electrodeless lamp 12 are set up to be small cooling hole sections 241, 242. <P>COPYRIGHT: (C)2010,JPO&INPIT

Description

  The present invention relates to an ultraviolet irradiation device using an electrodeless lamp that emits ultraviolet rays by being excited by microwaves.

Conventional electrodeless lamps that emit light by exciting encapsulated chemicals using microwaves emit ultraviolet and visible light, and are chemical substances based on surface hardening or photochemical reaction on surfaces coated with paint, ink, resin, paint, etc. It is used in processes such as synthesis and processing. Magnetrons are used to generate microwaves to excite encapsulated chemicals for electrodeless lamps. In order to excite the electrodeless lamp by emitting microwaves, transmission is performed from the magnetron to the electrodeless lamp through a waveguide. (For example, Patent Document 1)
Special table 2003-510773 gazette

  In the technique of Patent Document 1 described above, a plurality of cooling holes are formed in a waveguide in order to cool a magnetron or an antenna that transmits microwaves from the magnetron. However, since the cooling holes with the same shape are regularly formed, the cooling performance is poor and the life of the magnetron is shortened due to the effects of heat stress, which increases the running cost and maintenance complexity required for this. There was a problem of coming.

  An object of the present invention is to provide an ultraviolet irradiating apparatus in which the life of a magnetron is extended by improving the cooling efficiency of the magnetron antenna.

  In order to solve the above-described problems, an ultraviolet irradiation device of the present invention includes an electrodeless lamp in which a discharge medium capable of emitting ultraviolet rays by microwaves is enclosed, a magnetron for supplying microwaves to the lamp, A waveguide for supplying microwaves generated from the magnetron to the lamp, a reflector for condensing or diffusing the ultraviolet light of the lamp, and a cooling mechanism for cooling at least the magnetron and the lamp by blowing air; In the ultraviolet irradiation device configured in the housing, a plurality of cooling holes that do not leak microwaves are formed in the waveguide, and the shape of the cooling holes is large near the magnetron and small near the lamp. To do.

  The ultraviolet irradiation device of the present invention includes an electrodeless lamp in which a discharge medium capable of emitting ultraviolet rays by microwaves is enclosed, a magnetron for supplying microwaves to the lamp, and a microwave generated from the magnetron. And a waveguide for supplying power to the lamp, a reflector for condensing or diffusing the ultraviolet light of the lamp, and a cooling mechanism for cooling at least the magnetron and the lamp by blowing air. In the ultraviolet irradiation apparatus, a plurality of cooling holes that do not leak microwaves are formed in the waveguide, and the number of cooling holes is large near the magnetron and small near the lamp.

  According to the present invention, since the cooling hole formed in the waveguide can cool the magnetron antenna more efficiently than when the cooling hole has the same shape, it is possible to extend the life of the magnetron.

  Hereinafter, the best mode for carrying out the present invention will be described in detail with reference to the drawings.

  1 to 3 are diagrams for explaining a first embodiment of the ultraviolet irradiation apparatus according to the present invention. FIG. 1 is a system configuration diagram, FIG. 2 is a cross-sectional view taken along the line II ′ shown in FIG. FIG. 2 is a configuration diagram for explaining an example of an electrodeless lamp used in FIG. 1.

  1 and 2, reference numeral 11 denotes a casing, and a so-called electrodeless lamp 12 that does not include an electrode is disposed and attached to a lower central portion of the casing 11. 131 and 132 are magnetrons that generate microwaves. Reference numeral 14 denotes a power source for supplying power to the magnetrons 131 and 132. Reference numerals 151 and 152 denote waveguides that transmit the microwaves generated by the magnetrons 131 and 132 and transmitted from the antennas 161 and 162 to the electrodeless lamp 12.

  Here, a configuration example of the electrodeless lamp 12 will be described with reference to FIG. Reference numeral 121 denotes a cylindrical bulb having a length of about 240 mm made of quartz glass that transmits ultraviolet light. The valve 121 has a taper formed so that the central portion 122 is thinner than both end portions 123 and 124. The outer diameter of both end portions 123 and 124 is, for example, about 17 mm, and the outer diameter of the central portion 122 is 10 mm. Degree.

  The light emitting space 125 of the bulb 121 is filled with an inert gas and a discharge medium for discharging with a microwave mainly composed of mercury and iron. Support portions 126 and 127 for supporting the valve 121 are formed integrally with the valve 121 at both ends of the valve 121.

  1 and 2 again, reference numeral 17 denotes a light receiving element covered with a cover for receiving light emitted from the electrodeless lamp 12, knitting a metal wire into a mesh shape, or punching a metal plate, Is a light amount detector for detecting the amount of light received by the light receiving element 17. Reference numeral 19 denotes a control unit that controls the power supply 14 so that the amount of light detected by the light amount detector 18 becomes equal to a preset amount of light.

  The light quantity detector 18 is connected to the light receiving element 17 by a lead wire or the like, and detects the amount of light received by the light receiving element 17 based on, for example, the value of a current supplied from the light receiving element 17. The light quantity detector 18 is connected to the control unit 19 by a lead wire or the like, and applies an analog voltage indicating the detected amount of light to the control unit 19.

  The control unit 19 includes a computer that operates according to a computer program and an integrated circuit in which the computer is integrated. The control unit 19 includes a memory (not shown) in which an analog voltage indicating a desired amount of light, a control amount of the power supply 14, and a single amount when increasing or decreasing the control amount (referred to as a unit control amount) are stored. The memory initially stores the analog voltage, the initial value of the control amount, and the unit control amount. Further, the control unit 19 updates the control amount stored in the memory based on the analog voltage supplied from the light amount detector 18 and the analog voltage stored in the memory, and increases or decreases the control amount supplied to the power source 14. It is like that.

  The power supply 14 controls the magnetrons 131 and 132 so that a microwave having an energy amount corresponding to the control amount given from the control unit 19 is generated.

  Further, a cooling mechanism 20 mainly including a fan that cools the electrodeless lamp 12 and the magnetrons 131 and 132 by supplying wind, for example, is provided inside the casing 11.

  A reflector 21 is installed on the back side of the electrodeless lamp 12. Further, a screen 22 constituting an irradiation window is provided in a part of the housing 11 between the reflection surface side of the reflection plate 21 and an object to be irradiated (not shown). The screen 22 is made of metal and has an opening. For example, the screen 22 is formed by knitting metal wires into a mesh shape or by punching a metal plate to have an opening.

  By the way, a plurality of openings are formed in the waveguides 151 and 151 in order to cool the magnetrons 131 and 132 and the antennas 161 and 162 that transmit microwaves from the magnetron. The plurality of openings are large cooling hole portions 231 and 232 having a large opening area on the side close to the magnetrons 131 and 132, and from the small cooling hole portions 241 and 242 having a small opening area on the side close to the electrodeless lamp 12. Is formed. The large cooling holes 231 and 232 and the small cooling holes 241 and 242 can be formed at a time by using a punching method using a mold.

  The size of the opening area is 3 mm or less so that the microwaves do not leak from the waveguides 151 and 152 even in the large cooling hole portions 231 and 232.

  In this way, the area of the cooling hole on the side close to the magnetron and antenna is made wider than that on the side near the far electrodeless lamp, so that the magnetron antenna can be cooled efficiently, and as a result, the temperature rise of the magnetron is suppressed. This makes it possible to extend the life of the magnetron.

  FIGS. 4 and 5 are for explaining a second embodiment relating to the ultraviolet irradiation apparatus of the present invention. FIG. 4 is a system configuration diagram, and FIG. 5 is a sectional view taken along line II-II 'shown in FIG. In addition, the same code | symbol is attached | subjected to the same component as embodiment mentioned above, and it demonstrates centering on a different part here.

  In this embodiment, multi-cooling hole portions 411 and 412 having a large number of waveguides 151 and 151 per unit area on the side close to the magnetrons 131 and 132 and the antennas 161 and 162, and on the side close to the electrodeless lamp 12, The small cooling holes 421 and 422 were formed with a small number per unit area. In this case, the multi-cooling hole portions 411 and 412 and the small cooling hole portions 421 and 422 are each opened at about 3 mm where microwaves do not leak. The multiple cooling holes 411 and 412 and the small cooling holes 421 and 422 can be formed at a time by using a punching method using a mold.

  In this way, even when the number of cooling holes near the magnetron or antenna is increased and the number near the electrodeless lamp is decreased, the magnetron antenna can be efficiently cooled, and as a result, the temperature rise of the magnetron is suppressed. This makes it possible to extend the life of the magnetron.

  FIG. 6 is an explanatory diagram for explaining the effect of the present invention. In FIG. 6, the experimental result for comparing the cooling effect of the case where the conventional cooling hole is formed and the case where the cooling hole of this invention is formed is shown.

  Here, the measurement conditions will be described. First, the electrodeless lamp used in the experiment is an iron metal halide lamp manufactured by NORDSON, and the UV irradiation device used is Cool Wave “MPS610V” also manufactured by NORDSON. The thermometer was an NR-1000 (K thermocouple used) manufactured by KEYENIC.

  In addition, if the temperature measurement location is a magnetron and the cooling hole of the waveguide is the same shape after 60 seconds after the electrodeless lamp is extinguished as a measurement condition (conventional), the size of the cooling hole is close to the magnetron. In the case of the first embodiment (A) of the present invention in which the vicinity of the lamp is small and the number of cooling holes is large in the vicinity of the magnetron, and in the vicinity of the electrodeless lamp, the second embodiment of the present invention is reduced. FIG. 6 shows the measurement results for each case (B).

  As a result of the measurement, the temperature of the magnetron 60 seconds after the electrodeless lamp was turned off was 60.1 ° C. in the conventional case, 50.8 ° C. in the case (A) of the present invention, and 53 in the case (B) of the present invention. It was 4 ° C.

  From these measurement results, by changing the shape of the cooling hole, the temperature is reduced by about 15% in the case of (A) and about -15% in the case of (B) as compared to the antenna temperature of the conventional magnetron. I understood it. This cooling effect can extend the life of the magnetron.

  The present invention is not limited to the above-described embodiment. For example, the electrodeless lamp has a diameter in the center portion in the longitudinal direction smaller than the diameters at both ends, but the center portion and both ends may have the same diameter. Although the case where there are two magnetrons in the housing has been described, it may be one.

  Further, the cooling hole of the first embodiment of the present invention has a side closer to the magnetron larger than the side closer to the electrodeless lamp, and the cooling hole of the second embodiment has a side closer to the magnetron closer to the electrodeless lamp. In short, it is sufficient that the area of the cooling hole per unit area is larger on the side closer to the magnetron than on the side closer to the electrodeless lamp under the condition that the microwave does not leak.

  Although the electrodeless lamp has been described using the central portion having a smaller diameter than the diameters at both ends, the center portion and both ends may have the same diameter. In addition, although two magnetrons are arranged in the casing and microwaves are emitted from these magnetrons to one electrodeless lamp, the number of magnetrons may be one.

The system block diagram for demonstrating 1st Embodiment regarding the ultraviolet irradiation device of this invention. I-I 'sectional drawing shown in FIG. The block diagram for demonstrating an example of the electrodeless lamp used in FIG. The system block diagram for demonstrating 2nd Embodiment regarding the ultraviolet irradiation device of this invention. II-II 'sectional drawing shown in FIG. Explanatory drawing for demonstrating the effect of this invention.

Explanation of symbols

DESCRIPTION OF SYMBOLS 11 Case 12 Electrodeless lamp 131,132 Magnetron 14 Power supply 151,152 Waveguide 161,162 Antenna 20 Cooling mechanism 21 Reflector 22 Screen 231,232 Large cooling hole part 241,242 Small cooling hole part 411,412 Multiple cooling Hole part 421,422 Small cooling hole part

Claims (3)

An electrodeless lamp in which a discharge medium capable of emitting ultraviolet rays by microwaves is enclosed;
A magnetron for supplying microwaves to the lamp;
A waveguide for supplying microwaves generated from the magnetron to the lamp;
A reflector for condensing or diffusing the ultraviolet light of the lamp;
In the ultraviolet irradiation device in which at least the magnetron and the cooling mechanism that cools the lamp by blowing are configured in the housing,
An ultraviolet irradiation apparatus, wherein a plurality of cooling holes through which microwaves do not leak are formed in the waveguide, and the shape of the cooling holes is large near the magnetron and small near the lamp. An electrodeless lamp in which a discharge medium capable of emitting ultraviolet rays by microwaves is enclosed;
A magnetron for supplying microwaves to the lamp;
A waveguide for supplying microwaves generated from the magnetron to the lamp;
A reflector for condensing or diffusing the ultraviolet light of the lamp;
In the ultraviolet irradiation device in which at least the magnetron and the cooling mechanism that cools the lamp by blowing are configured in the housing,
An ultraviolet irradiation apparatus characterized in that a plurality of cooling holes through which microwaves do not leak are formed in the waveguide, and the number of cooling holes is large near the magnetron and small near the lamp.   3. The ultraviolet irradiation device according to claim 1, wherein the cooling hole is at most 3 mm.

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