KR20100057597A - Short wavelength ultraviolet discharge lamp and ultraviolet irradiation treatment apparatus - Google Patents

Abstract

This invention provides a short wavelength ultraviolet discharge lamp for emitting ultraviolet light with a wavelength of not more than 220 nm, comprising an insulating conductor, which can suppress the generation of a halide from an insulator in the insulating conductor. The discharge lamp comprises a quartz glass tube (31), a pair of electrodes (32a, 32b) disposed at its both ends, and an insulating conductor (38) extended along the outer wall of the quartz glass tube. The insulating conductor is covered with a nonhalogen-type insulator. By virtue of this, even when the insulating conductor is exposed to ultraviolet light, any halide whichposes safety and environmental protection problems is not generated. In particular, when a polymer compound having an aromatic ring or a heterocyclic ring in its main chain is used as the insulator, the deterioration resistance can be improved.

Description

Short wavelength ultraviolet discharge lamp and ultraviolet irradiation processing device {SHORT WAVELENGTH ULTRAVIOLET DISCHARGE LAMP AND ULTRAVIOLET IRRADIATION TREATMENT APPARATUS}

The present invention relates to a discharge lamp that emits light in a wavelength region of at least 220 nm or less, and an ultraviolet irradiation processing apparatus that mounts the discharge lamp and uses ultraviolet rays emitted from the discharge lamp.

Ultraviolet rays in the short wavelength region are used for various periods such as decomposition and sterilization of harmful substances and organic substances. For example, FIG. 7 shows an example of the organic matter decomposition apparatus in water according to the prior art.

Reference numeral 1 denotes a cylinder made of stainless steel, and both ends thereof are closed by flanges 1a and 1b. Reference numeral 1c denotes the flange of the inlet port, and 1d denotes the flange of the outlet port. Although the to-be-processed water 5 flows from the flange 1c side toward the flange 1d side, it has a structure which arrange | positioned several reflux boards 1e-1i on the way so that a water to-be-processed may not short-pass. Reference numeral " 3 " denotes a discharge lamp that emits light including ultraviolet rays having a wavelength of 220 nm or less, and generally a low pressure mercury vapor discharge lamp composed of a quartz glass tube having a transparency from a wavelength range of 220 nm or less to a long wavelength region is used. Reference numeral " 2 " denotes a floodlight tube that separates the discharge lamp and the water to be treated, and is similarly made of quartz glass having a transparency from a wavelength range of 220 nm or less to a long wavelength range (the floodlight tube 2 and the discharge lamp 3 are usually in plural numbers). Installed in parallel but only one in FIG. 7). Ultraviolet rays pass through the floodlight tube 2 and are irradiated to the water to be treated 5. Since the binding energy of H-OH of water molecules (H ₂ O) is 499 kJ / mol, ultraviolet rays having a wavelength of 220 nm or less have the ability to dissociate water molecules (H ₂ O) and generate OH radicals. The generated OH radical decomposes organic substances present in water into harmless CO, CO ₂ , H ₂ O as shown in the following equation.

H ₂ O + hυ (185 nm) → H + OH radical

CnHmOK + OH radical → CO, CO ₂ , H ₂ O

(n, m, k is 1, 2, 3,…)

Next, the discharge lamp 3 will be described. The tube body 31 is made of quartz glass, and has a pair of electrodes 32a and 32b at both ends, and mercury is enclosed as a light emitting metal. The electrode 32b on one side is electrically led out to the other end side by the lead wire 38, and is housed in the cage 37 together with the lead wire connected to the electrode on the other side. That is, since the lead wire 38 is pulled along the outer wall, it is necessary to withstand the heat generated during discharge generated by the discharge lamp 3, and generally ETFE (ethylene tetrafluoroethylene copolymer, FEP (tetrafluoroethylene hexa) Fluorine-based insulated conductors such as fluoropropylene copolymer), PFA (perfluoroalkyl vinyl ether copolymer), PTFE (tetrafluoroethylene resin), etc. are used. Mercury-specific ultraviolet rays or visible rays containing 185 nm ultraviolet rays are emitted, contributing to the decomposition reaction treatment of the above-mentioned organic substances.

By the way, since the discharge lamp is accompanied by a decrease in the ultraviolet output, it is necessary to replace it regularly for about half a year to one year, but when replacing the conventional discharge lamp configured as described above with irritating and intense irritation odor and irritation pain to the skin Can be received.

It is thought that irritation odor and irritation pain are caused by the insulation coating material of the lead wire exposed to short wavelength ultraviolet rays or ozone generated by the ultraviolet rays, and the fluorine component of the material precipitates and reacts with the surrounding moisture to produce hydrogen fluoride or hydrofluoric acid. This type of discharge lamp or ultraviolet light treatment device is a serious obstacle for safety and environmental protection. For this reason, Japanese Patent Application Laid-Open No. 2002-282851 proposes an ultraviolet irradiation processing apparatus configured to use a non-insulated wire having no coating on a conducting wire of a discharge lamp, and to exit from the floodlight tube unless the power supply to the discharge lamp is cut. It is.

However, the above invention is not necessarily accepted because the cost and the period required for retrofitting are expanded in the existing apparatus, although the apparatus can be adapted to a newly manufactured and installed apparatus. In addition, it cannot be denied that there is a mental rejection in handling the discharge of the non-insulated wire.

On the other hand, in recent years, high-efficiency, high-output discharge lamps described in Japanese Patent No. 3563373 have emerged, and there is a strong demand for replacement with existing equipment for the purpose of improving processing capacity. In the case where a high output type discharge lamp is used, troubles related to the generation of hydrogen fluoride and the like are more likely to be concerned. Therefore, a safe and reliable discharge lamp is strongly demanded.

Patent Document 1: Japanese Unexamined Patent Publication No. 2002-282851

Patent Document 2: Patent Publication No. 3553573

The present invention provides a discharge lamp in which ultraviolet rays including a wavelength region of 220 nm or less are radiated, wherein one end is electrically connected to one electrode and the other end is caused by an insulator of an insulated conductor that is turned to the other side. It is an object of the present invention to provide a discharge lamp and an ultraviolet irradiation treatment device that solve the problem and contribute to safety or environmental protection for the human body.

The short wavelength ultraviolet discharge lamp of the present invention includes a pair of electrodes opposed to each other at both ends of a quartz glass tube, and is coated with a non-halogen-based insulator on one electrode in a discharge lamp encapsulating a substance emitting light in a wavelength region of at least 220 nm or less. One end of the insulated conductor is connected, and the insulated conductor is guided to the electrode on the other side along the outer wall of the quartz glass tube, and is connected to the supply power supply on the same side as the conductor electrically connected to the electrode on the other side. It is done.

The short-wavelength ultraviolet discharge lamp of the present invention stores the insulated conductor guided to the other electrode side and the conducting wire electrically connected to the electrode of the other side in a unitary unit, which can be attached to and detached from the power supply, so that the attachment and detachment is easy, and the handling is convenient. Do.

In the present invention, the non-halogen-based insulator used for the insulated conductor preferably contains a high molecular compound having an aromatic ring and / or a hetero ring in the main chain. At least one of the aromatic ring and the heterocyclic ring in the main chain has high resistance to degradation by ultraviolet rays.

In addition, the non-halogen-type insulator used for the said insulated conductor is not limited to having only an aromatic ring or a heterocyclic ring in a main chain, and it carries out 1 or more chemical bonds chosen from an amide bond, an ester bond, and a urethane bond with an aromatic ring or a heterocyclic ring. Having has particularly high resistance.

As such a high molecular compound, polyimide, polyamideimide, polyesterimide, aromatic polyamide, polybenzimidazole, polyether ether ketone (PEEK), polycarbonate, polyester, etc. are illustrated. In addition, an insulator made of an aliphatic polymer compound such as nylon, polyolefin, polysulfone, ethylene-propylene copolymer (EPR or EPDM) or polyurethane may be used as long as it does not emit halogen-based gas.

As the non-halogen-based insulator, an inorganic insulator composed of at least one of an oxide or nitride of silicon, aluminum, zinc or zirconium and glass fiber can also be used.

These insulators may be coated by coating or printing varnishes, extrusion coatings, tubular coatings, tape windings, braids of fibers, or a combination thereof on a conductor consisting of single wire, twisted wire, aggregate wire or braided wire. do.

The ultraviolet irradiating apparatus of the present invention interpolates the above-described short wavelength ultraviolet light into a tube having light transmissivity in a wavelength range of at least 220 nm or less, and irradiates the ultraviolet light emitted from the short wavelength ultraviolet light through the wall of the light emitting tube to be treated. It is made. In addition, a seal between the short wavelength ultraviolet discharge lamp and the tube having light transmission in the wavelength region of at least 220 nm or less, and an inert gas is sealed or flowed between the short wavelength ultraviolet discharge lamp and the light transmitting tube to further deteriorate the insulator. It is preferable to protect.

According to the short-wavelength ultraviolet discharge lamp of the present invention, generation of halogen-based gas such as harmful hydrogen halide or hydrogen halide acid, which has been a problem in conventional discharge lamps and ultraviolet irradiation treatment devices, is completely prevented. In addition, the discharge lamp of the present invention can be easily attached to or detached from a power supply by storing an insulated conductor guided near the other electrode and a conducting wire electrically connected to the other electrode in an integral part.

When a polymer compound having an aromatic and / or heterocyclic ring in the main chain is used as the non-halogen-based polymer compound, these polymer compounds are particularly excellent in durability against ultraviolet rays and ozone, thereby obtaining an excellent effect.

BRIEF DESCRIPTION OF THE DRAWINGS The figure which shows the insulated wire sample tied to the outer periphery of an ultraviolet discharge lamp in embodiment of this invention,
2 is a cross-sectional view schematically showing an ultraviolet discharge lamp of an embodiment of the present invention;
3 is a cross-sectional view schematically showing an ultraviolet discharge lamp of another embodiment of the present invention;
4 is a cross-sectional view schematically showing an ultraviolet discharge lamp of another embodiment of the present invention;
5 is a cross-sectional view of the ultraviolet discharge lamp of the embodiment of FIG. 4 as seen from the socket 39b side;
6 is a sectional view schematically showing an ultraviolet treatment device according to another embodiment of the present invention, and
It is sectional drawing which shows typically a conventional ultraviolet processing apparatus.

Then, embodiment of this invention is described. In order to confirm the effect of this invention, as shown in FIG. 1, the following insulated conductor samples were tied to the outer periphery of a discharge lamp, and the acceleration test was implemented.

(a) Fluorine resin extrusion coating lead of FEP and ETFE

(b) vinyl chloride resin extrusion coating conductor

(c) aromatic polyimide tubular sheathed wire

(d) aromatic polyimide tape winding coated conductor

(e) PEEK tubular sheathed conductor

(f) polyethylene tubular sheathed conductor

(g) nylon tape winding cloth conductor

(h) mica tape winding cloth lead wire

(i) alumina fiber braided sheathed lead

(j) silicone rubber sheathed lead wire

In Fig. 1, reference numeral “333” denotes a double-sided high output low pressure mercury vapor discharge lamp that emits ultraviolet rays including a wavelength of 185 nm having a tube diameter of 15 mm and a light emission length of about 1.5 m. Tens or more of the same insulated conductor samples 333a, 333b, 333c, 333d, ..., ... are tied around each other over almost the entire length of the tube of the discharge lamp and reacted by binding them with nickel spirals 334a, 334b. About 10 cc of water was dripped for acceleration, it inserted in the quartz glass floodlight tube, and the both ends of the floodlight tube were sealed with the rubber cap, and it turned on.

After one month of continuous lighting, the discharge lamp was removed from the floodlight tube, and the presence or absence of a magnetic odor and the external surface of the discharge lamp were wiped with a litmas test paper to check the pH (paper) level.

As a result, from the samples of (a) the fluorine resin coated wires of FEP and ETFE and (b) the vinyl chloride resin coated wire, the adhesion of an acidic product was recognized with a odor. On the other hand, irritation odor was not recognized from all the other samples of (c)-(j), and the litmas test paper result also showed that it was neutral.

From the above experimental results, (c) aromatic polyimide tubular sheathed conductor, (d) the same as the tape wound sheathed conductor, (e) the PEEK varnish coating conductor, (g) the nylon tape wound sheathed conductor, (h) the mica tape wound sheathed conductor (i) It has been confirmed that the alumina fiber braided coated conductor is effective for overcoming the problem. That is, although (f) polyethylene tubular coated wire and (J) silicone rubber coated wire were not confirmed to produce odor or acidic substance, it was recognized that fine cracking occurred in the coating and there was a problem in durability as an insulator. Subsequently, each of the (a) FEP and ETFE fluorine-based resin insulated wires and (b) the vinyl chloride resin insulated wires is 10 or more, respectively. After interpolation into the light pipe, the inside of the light pipe was replaced with nitrogen gas, and both ends were sealed with a rubber cap and lit. After one month of continuous lighting, the discharge lamp was removed from the floodlight tube as described above, and the presence of a magnetic odor and the pH (paper) level of the outer surface of the discharge lamp were checked. As a result, the irritating odor was not recognized, and the litmas test was also neutral.

From this result, it was confirmed that deterioration of the insulator and generation of hydrogen halide are suppressed when the inside of the light transmitting tube is replaced with nitrogen gas and no water is present.

(Example)

One embodiment of a discharge lamp 3 according to the invention is shown in FIG. 2. Reference numeral " 31 " denotes a tube of a discharge lamp made of quartz glass having an outer diameter of 15 mm and a total length of 1.6 m from a wavelength range of 220 nm or less to a long wavelength region. A discharge lamp having a proper relationship between the inner diameter of the tube, the discharge current, and the potential frequency by using synthetic quartz glass for the tube body 31 is obtained with high efficiency and high output type discharge lamp. Both ends of the tube body 31 are provided with a pair of filaments (electrodes) 32a and 32b at intervals of about 1.5 m, and the pair of filaments 32a and 32b are inner leads 33a, 33b, 33c and 33d, respectively. ) Is sealed to the tube through the molybdenum foils 34a, 34b, 34c, 34d and the outer leads 35a, 35b, 35c, 35d and electrically guided to the outside of the tube, Contains an appropriate amount of mercury and rare gases. Reference numeral 36 denotes a ceramic cap that protects the tube end, and 37 denotes a ceramic cap having feed pins 37a and 37b. &Quot; 38 " is a lead wire insulated with a polyimide tube having a wire cross section of about 0.6 square meters with an inner diameter of 1 mm x an outer diameter of 1.5 mm, and is crimp-connected to an outer lead 35c electrically connected to the filament 32b, It is led to the filament 32a side of the other side along the outer wall of the tubular body 31, and is soldered to the feed pin 37b in the metal mold | die 37. The outer lead 35b of the filament 32a is also soldered to the feed pin 37a in the cage 37, and forms a so-called piece-shaped discharge lamp or the like. That is, since the polyimide of an insulator material has an insulation breakdown voltage of several kV or more, it satisfies necessary sufficient conditions as a lead insulator of the said discharge lamp to which only a voltage of about 100V is applied.

When the discharge lamp configured as described above is turned on with the discharge current 1A through a predetermined electronic ballast (not shown), 7.5 W corresponding to about 5% of the power of the discharge lamp is radiated as ultraviolet energy of 185 nm, and part of the tube is turned off. Therefore, although it is irradiated to lead insulated conductors, it does not emit harmful hydrogen halide or hydrochloric acid. In the above embodiment, the feed pins connected to the opposite electrodes are shown in the form of single-segment die discharge lamps housed in a unitary detention, but the insulated wire 38 shown in FIG. 50) may be a discharge lamp or the like. 3-6, the same code | symbol is attached | subjected to the part common to FIGS. 7, 1, and 2, and the overlapping description is abbreviate | omitted.

4 and 5 show an embodiment of an ultraviolet irradiation processing apparatus that exhibits the same effect by using both of the two discharge lamps 3. In FIG. 4, reference numeral 3 denotes a double-sided discharge lamp that emits ultraviolet rays including a wavelength region of 220 nm or less, and is inserted into the floodlight tube 2 and has a portion 38a and 38b electrically connected to electrodes at both ends. The gap between the outer circumferential portion and the floodlight tube 2 and the gap between the insulated conductive wire 40 and the floodlight tube 2 are sealed with rubber caps 40a and 40b fitted to the ends of the floodlight tube 2. The rubber caps 40a and 40b are provided with through holes through which the outer peripheral portions of the caps 38a and 38b and the insulated conductor 40 are hermetically sealed, and the outer peripheral portions of the caps 38a and 38b protrude out from the through holes. The sockets 39a and 39b are connected to these molds 38a and 38b, respectively, and have a structure in which power is supplied to the discharge lamp 3 through the connector 50 from a power source not shown.

FIG. 6: is the ultraviolet irradiation process which interpolated the discharge lamp 3 to the floodlight tube 2, and used the inside of the floodlight tube in the atmosphere of nitrogen gas. The actual apparatus is generally a device in which a discharge lamp is inserted into a plurality of floodlights, respectively, but only one is shown for convenience. Reference numeral " 3 " denotes a single-molecular discharge lamp that emits ultraviolet rays including a wavelength region of 220 nm or less, and the insulated lead of the lead wire 38 through one electrode is not limited to the non-halogenated material. When the apparatus starts to operate, the discharge lamp 3 is inserted into the floodlight tube 2, and then the inside of the floodlight tube is replaced with nitrogen gas to seal both sides with rubber caps 40a and 40b. The rubber cap 40a has a hole through which the socket is in close contact, and the rubber cap 40b is a closed body without a hole. Before the two rubber caps are completely inserted, the entire cylinder 1 can be covered with a large plastic bag or the like and filled with nitrogen gas for easy replacement. After that, the cylinder covers 41a and 41b are attached, and the inside of the cylinder covers 41a and 41b is filled with nitrogen gas, which is more effective. In the ultraviolet irradiation processing apparatus configured as described above, since the insulated wire 38 drawn along the tube such as the discharge is in the nitrogen atmosphere, even the insulated wire of the halogenated material does not deteriorate, and does not emit harmful hydrogen halide or hydrohalide. Reference numeral 42 is a power source.

In addition, in the embodiment of the present invention, an insulated wire connected by connecting a conducting wire to one side of a pair of filaments and having a 2-pin detention, i.e., an insulated conducting wire which pulls the outer wall of the tube, shows one discharge lamp. However, there is no problem even if there are a plurality of preheated low-pressure mercury vapor discharge lamps that connect the conducting wires to both sides of the filament and heat the filament in advance, that is, a plurality of insulated conducting wires which pull the outer wall of the tubular body. It is not courted. In addition, not only mercury vapor discharge lamps are applied, but also applied to a light source that emits light in a wavelength region of 220 nm or less, for example, an excimer lamp or a xenon lamp, has the same effect. Alternatively, the target device is not limited to the horizontal type but may be a vertical type, and the light transmitting tube into which the discharge lamp is inserted is not limited to a shape having openings at both ends, but may be sealed at one end.

That is, the discharge lamp shown in Example 1 was mounted in an existing ultraviolet irradiation treatment apparatus which performs organic substance decomposition treatment in hundreds of units, so that there was no particular problem and satisfactory performance. When replacing the discharge lamp, it was confirmed that there is no obstacle in terms of safety, environment and health as well as replacement, handling and disposal operations.

2: floodlight 3: discharge lamp
31: tube 32a, 32b: filament
33a, 33b, 33c, 33d: inner lead 34a, 34b, 34c, 34d: molybdenum foil
35a, 35b, 35c, 35d: outer lead 36: cap
37, 38a, 38b: Detention 37a, 37b: Feed pin
38: lead wire insulated with polyimide tube
39a, 39b: socket 40a, 40b: rubber cap
41a, 41b: cylinder cover 42: power supply

Claims (9)

In a discharge lamp having a pair of electrodes opposed to each other at both ends of a quartz glass tube and encapsulating a substance emitting light in a wavelength region of at least 220 nm,
One end of an insulated conductor coated with a non-halogen-based insulator to one electrode, leading the insulated conductor to the electrode on the other side along the outer wall of the quartz glass tube, and electrically connected to the electrode on the other side A short-wavelength ultraviolet discharge lamp, characterized by being able to be connected to a supply power source on the same side as the above. The method of claim 1,
A short-wavelength ultraviolet discharge lamp comprising an insulating conductor guided near the other electrode and a conducting wire electrically connected to the electrode on the other side in a unitary detention and detachable from the power supply. The method according to claim 1 or 2,
The non-halogen insulator includes a high molecular compound having at least one of an aromatic ring and a hetero ring in the main chain. The method according to any one of claims 1 to 3,
The high-molecular compound short-wave ultraviolet discharge lamp, characterized in that the main chain has at least one chemical bond selected from amide bonds, ester bonds, ether bonds, CO bonds and urethane bonds. The method according to claim 1 or 2,
The polymer compound may be polyimide, polyamideimide, polyesterimide, aromatic polyamide, polybenzimidazole, polyetheretherketone (PEEK), nylon, polycarbonate, polyester, polyolefin, polysulfone, ethylene-propylene copolymer ( EPR or EPDM) and a short wavelength ultraviolet discharge lamp, characterized in that consisting of one or more selected from polyurethane. The method according to claim 1 or 2,
The non-halogen insulator is a short wavelength ultraviolet discharge lamp comprising an inorganic insulator comprising at least one of oxides or nitrides of silicon, aluminum, zinc or zirconium and glass fibers. The method according to any one of claims 1 to 6,
A non-halogen-based insulator is a non-halogen-based insulator which is coated on a conductor by coating varnish, printed coating, extrusion coating, tubular coating, tape winding, braiding of fibers, or a combination thereof. The short-wavelength ultraviolet discharge lamp according to claim 1 is inserted into a tube having a light transmitting property in a wavelength range of at least 220 nm or less, so that ultraviolet rays emitted from the short-wavelength ultraviolet discharge lamp can be irradiated to the object through the wall of the floodlight tube. UV irradiation processing device. A pair of electrodes opposed to each other are provided at both ends of the quartz glass tube, one end of the insulated conductor is connected to one electrode, and the insulated conductor is led to the other electrode along the outer wall of the quartz glass tube, A short-wavelength ultraviolet discharge lamp emitting light in a wavelength region of at least 220 nm or less configured to be connected to a supply power source on the same side as the conductive wire electrically connected to the electrode is interpolated into a light transmitting tube in a wavelength range of at least 220 nm or less, and the short wavelength ultraviolet discharge lamp And an inert gas sealed or circulated between both the said light-transmissive tube and the said light-transmissive tube, The ultraviolet irradiation processing apparatus characterized by the above-mentioned.

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