Liquid Treatment Equipment

Abstract

To provide a liquid treatment device which can make temperature of the most coolest portion suitable.SOLUTION: A liquid treatment device comprises: a container to which liquid is supplied; a protective tube which extends inside the container; a discharge lump which performs ultraviolet irradiation in the protective tube; and a temperature control unit which is provided in the vicinity of one end of the discharge lump. The discharge lump includes: a cylindrical bulb which has rare gas and mercury or the rare gas and amalgam enclosed in an internal space thereof; sealing parts which are provided on different ends on both sides of the bulb; a first electrode which is provided in one of the sealing parts and is exposed to the internal space of the bulb; and a second electrode which is provided in the other of the sealing parts and is exposed to the internal space of the bulb. A distance between an end of the first electrode, exposed to the internal space of the bulb, and an end of the sealing part having the first electrode provided therein is longer than that between an end of the second electrode, exposed to the internal space of the bulb, and an end of the sealing part having the second electrode provided therein. The temperature control unit covers the vicinity of the end of the bulb on a side where the first electrode is provided in the bulb, controlling temperature of the most coolest portion of the discharge lump.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] FIELD OF THE INVENTION Embodiments of the present invention relate to a liquid treatment device. [Background technology]

[0002] There are liquid treatment devices that irradiate liquids such as water with ultraviolet light to remove organic matter contained in the liquid or sterilize the liquid. Treatment using ultraviolet light causes almost no deterioration of the liquid being treated compared to treatment using heat or chemicals, and can also be used to treat a wide variety of impurities, bacteria, viruses, etc. For this reason, liquid treatment devices that irradiate liquids with ultraviolet rays are used in a wide range of technical fields, such as cleaning processes for electronic components such as semiconductor devices, sterilizing drinking water and removing impurities, sterilizing commercial water (fishery water, agricultural water, food factory water, etc.) and removing impurities, and sterilizing various types of industrial water and removing impurities.

[0003] As such a liquid treatment apparatus, a liquid treatment apparatus has been proposed which includes a protective tube disposed in the liquid to be treated, and a low-pressure mercury lamp disposed inside the protective tube and which irradiates ultraviolet light. When a low-pressure mercury lamp is turned on, some of the mercury sealed inside the bulb vaporizes due to the heat generated by lighting. When electrons collide with the vaporized mercury, ultraviolet rays with a peak wavelength of 254 nm or ultraviolet rays with peak wavelengths of 185 nm and 254 nm are generated. In this case, if the mercury vapor pressure is too low, the ultraviolet irradiance will be insufficient, and if the mercury vapor pressure is too high, the generated ultraviolet rays will be absorbed by the mercury, attenuating the ultraviolet irradiance. Therefore, it is necessary to keep the mercury vapor pressure within an appropriate range.

[0004] The vapor pressure of mercury can be controlled by providing a part of the bulb that has the lowest temperature (coldest part) during lighting. However, the low-pressure mercury lamp installed in the liquid treatment device is placed in the liquid via a protective tube. Therefore, the temperature of the coldest part is likely to change depending on the temperature of the liquid. If the temperature of the coldest part changes depending on the temperature of the liquid, the irradiance of the ultraviolet light emitted from the low-pressure mercury lamp may decrease.

[0005] Therefore, there has been a demand for the development of a liquid treatment device that can adjust the temperature of the coldest part to an appropriate level. [Prior art documents] [Patent documents]

[0006] [Patent Document 1] Japanese Patent Application Laid-Open No. 2003-144912 Summary of the Invention [Problem to be solved by the invention]

[0007] The problem to be solved by the present invention is to provide a liquid treatment device that can adjust the temperature of the coldest part to an appropriate level. [Means for solving the problem]

[0008] A liquid treatment device according to an embodiment is a liquid treatment device that irradiates a liquid with ultraviolet light. The liquid treatment device includes: a container having an internal space for supplying the liquid; at least one protective tube extending through the container; at least one discharge lamp extending through the protective tube and capable of irradiating the ultraviolet light; and a temperature control unit provided near one end of the discharge lamp. a moving unit that moves a relative position between the temperature control unit and the discharge lamp in the extension direction of the discharge lamp according to the temperature of the liquid;The discharge lamp comprises a cylindrical bulb having an internal space filled with a rare gas and mercury, or a rare gas and amalgam; sealing portions provided on both ends of the bulb; a first electrode provided on one of the sealing portions and exposed to the internal space of the bulb; and a second electrode provided on the other sealing portion and exposed to the internal space of the bulb. The distance between the end of the first electrode exposed to the internal space of the bulb and the end of the sealing portion where the first electrode is provided is longer than the distance between the end of the second electrode exposed to the internal space of the bulb and the end of the sealing portion where the second electrode is provided. The temperature control unit covers the bulb near the end where the first electrode is provided and controls the temperature of the coldest spot of the discharge lamp. [Effects of the Invention]

[0009] According to an embodiment of the present invention, it is possible to provide a liquid treatment device that can adjust the temperature of the coldest part to an appropriate level. [Brief explanation of the drawings]

[0010] [Figure 1] 1 is a schematic cross-sectional view illustrating a liquid treatment apparatus according to an embodiment of the present invention. [Figure 2] FIG. 1 is a schematic cross-sectional view of a discharge lamp. [Figure 3] 2 is a schematic cross-sectional view illustrating the vicinity of the upper end of the discharge lamp in FIG. 1. FIG. [Figure 4] 2 is a schematic cross-sectional view illustrating the vicinity of the lower end of the discharge lamp in FIG. 1. FIG. [Figure 5] 10 is a graph illustrating the effect of a temperature control unit. [Figure 6] 10 is a schematic diagram illustrating a case where the position of the discharge lamp is changed relative to the upper end of the temperature control unit. FIG. [Figure 7] 10 is a schematic diagram illustrating a case where the position of the discharge lamp is changed relative to the upper end of the temperature control unit. FIG. [Figure 8]FIG. 10 is a schematic cross-sectional view illustrating a case where the distance L4 (mm) is changed depending on the temperature of the liquid. DETAILED DESCRIPTION OF THE INVENTION

[0011] Hereinafter, embodiments will be illustrated with reference to the drawings. In the drawings, like components are designated by like reference numerals and detailed descriptions thereof will be omitted where appropriate.

[0012] 1 is a schematic cross-sectional view illustrating a liquid treatment device 100 according to the present embodiment. In FIG. 1, "upper" indicates the upper side in the direction of gravity, and "lower" indicates the lower side in the direction of gravity. The liquid treatment device 100 irradiates ultraviolet light onto a liquid 300 to be treated. The liquid 300 may be, for example, a liquid containing water.

[0013] As shown in FIG. 1, the liquid treatment device 100 includes, for example, a discharge lamp 1, a temperature control unit 10, a protective tube 101, a lid 102, a sealing member 103, a container 104, a holder 105, a sealing member 106, and a mounting unit 107.

[0014] The discharge lamp 1 can be a low-pressure mercury lamp. In this case, the low-pressure mercury lamp can be a lamp that irradiates ultraviolet rays with a peak wavelength of 254 nm, or a lamp that irradiates ultraviolet rays with peak wavelengths of 185 nm and 254 nm.

[0015] There can be provided at least one discharge lamp 1. The liquid treatment device 100 illustrated in Fig. 1 is provided with one discharge lamp 1. The discharge lamp 1 extends inside a protective tube 101.

[0016] FIG. 2 is a schematic cross-sectional view of the discharge lamp 1. As shown in FIG. As shown in FIGS. 1 and 2, a discharge lamp 1 includes, for example, a bulb 2, a sealing portion 3, a first electrode 4a, a second electrode 4b, a socket 5, a lead wire 6, and a lead wire .

[0017] The bulb 2 is cylindrical and has a configuration in which the overall length (length in the tube axis direction) is longer than the tube diameter. The bulb 2 is, for example, a cylindrical tube. The outer diameter D (mm) of the bulb 2 is, for example, 10 mm or more and 25 mm or less. The wall thickness of the bulb 2 is, for example, about 1 mm.

[0018] The length of the bulb 2 in the axial direction can be changed as appropriate depending on the specifications of the liquid treatment device 100. For example, the light-emitting length of the discharge lamp 1 can be made longer than the distance between a bottom plate 104a and a ceiling plate 104b of a container 104, which will be described later.

[0019] The internal space (discharge space) of the bulb 2 is filled with a rare gas and mercury, or a rare gas and amalgam. Amalgam is an alloy of mercury and a metal. Examples of metals include zinc, bismuth, indium, and tin. The amount of mercury or amalgam filled is, for example, about 1 mg to 300 mg. The rare gas can be a single gas such as krypton, xenon, argon, or neon, or a mixed gas made by mixing multiple types of gases.

[0020] The pressure (filled pressure) of the rare gas in the internal space of the bulb 2 at 25°C can be, for example, 0.1 Torr (13.3 Pa) or more and 10 Torr (1333 Pa) or less. In other words, the discharge lamp 1 is a low-pressure mercury lamp. The pressure (filled pressure) of the rare gas in the internal space of the bulb 2 at 25°C can be determined from the standard state of the gas (SATP (Standard Ambient Temperature and Pressure): temperature 25°C, 1 bar).

[0021] In the tube axis direction of the bulb 2, a sealing portion 3 is provided at each end on both sides of the bulb 2. By providing the sealing portion 3, it is possible to airtightly seal the internal space of the bulb 2. Furthermore, one sealing portion 3 is provided with a first electrode 4a, and the other sealing portion 3 is provided with a second electrode 4b.

[0022] A first electrode 4a and a second electrode 4b are exposed in the internal space of the bulb 2. The second electrode 4b faces the first electrode 4a. As shown in FIG. 1, the first electrode 4a is provided in a sealing portion 3 provided at the lower end of the bulb 2. The second electrode 4b is provided in a sealing portion 3 provided at the upper end of the bulb 2.

[0023] FIG. 3 is a schematic cross-sectional view illustrating the vicinity of the upper end of the discharge lamp 1 in FIG. As shown in FIG. 3, the second electrode 4b includes, for example, a well 4b1, a filament 4b2, and an emitter 4b3.

[0024] The wells 4b1 are linear and provided as a pair inside the sealing portion 3. One end of the wells 4b1 protrudes from the sealing portion 3 into the interior of the bulb 2. One end of the wells 4b1 holds the end of the filament 4b2. The other end of the wells 4b1 is exposed outside the sealing portion 3. The other end of the wells 4b1 is electrically connected to the lead wire 7 via the socket 5.

[0025] The filament 4b2 is provided inside the bulb 2. The filament 4b2 is a spirally wound linear member made of, for example, tungsten or a tungsten-renium alloy. The filament 4b2 may be a double filament, in which the filament is wound twice around the linear member, or a triple filament, in which the filament is wound three times.

[0026] The emitter 4b3 is provided on the filament 4b2. The emitter 34 is formed by applying a mixture of BaO, SrO, and CaO, which have low work functions, to the filament 4b2. Furthermore, ZrO2 or the like can be further added to the mixture to prevent evaporation of the emitter 34 material. The provision of the emitter 4b3 allows for a reduction in the starting voltage and tube voltage.

[0027] FIG. 4 is a schematic cross-sectional view for illustrating the vicinity of the lower end portion of the discharge lamp 1 in FIG. 1. As shown in FIG. 4, the first electrode 4a has, for example, wells 4a1, filaments 4b2, and emitters 4b3.

[0028] The wells 4a1 are linear and provided in a pair inside the sealing portion 3. One end of the wells 4a1 protrudes from the sealing portion 3 into the inside of the bulb 2. One end of the wells 4a1 holds the end of the filament 4b2. The other end of the wells 4a1 is exposed outside the sealing portion 3. The other end of the wells 4a1 is electrically connected to the lead wire 6 via the socket 5.

[0029] As shown in FIGS. 3 and 4, in the tube axis direction of the bulb 2, the length of the wells 4a1 is longer than the length of the wells 4b1. The protruding length of the wells 4a1 from the sealing portion 3 is longer than the protruding length of the wells 4b1 from the sealing portion 3. Therefore, the distance L1 (mm) between the end portion (the end portion of the filament 4b2) of the first electrode 4a exposed in the internal space of the bulb 2 and the end portion of the sealing portion 3 where the first electrode 4a is provided is longer than the distance L2 (mm) between the end portion (the end portion of the filament 4b2) of the second electrode 4b exposed in the internal space of the bulb 2 and the end portion of the sealing portion 3 where the second electrode 4b is provided.

[0030] In this case, the relationship between the outer diameter D (mm) of the bulb 2 and the distance L1 (mm) is preferably "0.34 < D (mm) / L1 (mm) < 1.0". By doing so, the temperature control of the coldest part by the temperature control units 10 and 10a described later becomes easy.

[0031] If the distance between the end of the electrode and the end of the sealing portion 3 where the electrode is provided becomes longer in the axial direction of the bulb 2, the temperature of the portion of the bulb 2 between the end of the electrode and the end of the sealing portion becomes lower. Therefore, inside the bulb 2, the coldest spot is formed between the end of the first electrode 4a and the sealing portion 3 where the first electrode 4a is provided. The coldest spot is the part of the bulb 2 where the temperature becomes the lowest while the discharge lamp 1 is lit. In the coldest spot, some of the mercury vapor condenses to produce mercury or amalgam.

[0032] Increasing the distance L1 (mm) decreases the temperature of the coldest spot, while shortening the distance L1 (mm) increases the temperature of the coldest spot. Therefore, by controlling the temperature of the coldest spot with the distance L1 (mm), it is possible to keep the vapor pressure of the mercury vapor within an appropriate range.

[0033] As shown in FIG. 1, the end of the discharge lamp 1 on the side where the first electrode 4a is provided is preferably located lower in the direction of gravity than the end of the discharge lamp 1 on the side where the second electrode 4b is provided. As described above, in the coldest part, a portion of the mercury vapor condenses to generate mercury or amalgam. Therefore, if the coldest part is located on the upper side in the direction of gravity, the generated mercury or amalgam is likely to flow out below the coldest part. If the generated mercury or amalgam flows out, the vapor pressure of the mercury vapor becomes unstable. In contrast, if the coldest part is located on the lower side in the direction of gravity, the generated mercury or amalgam can be prevented from flowing out of the coldest part. Therefore, the vapor pressure of the mercury vapor can be stabilized.

[0034] Furthermore, if the difference between the distance L1 (mm) and the distance L2 (mm) is too small, it becomes difficult to stabilize the temperature of the coldest spot. According to the knowledge of the inventors, the temperature of the coldest spot can be stabilized by setting the difference between the distance L1 (mm) and the distance L2 (mm) to 10 mm.

[0035] 1 and 2, one socket 5 is provided for one sealing portion 3. The socket 5 is cylindrical and covers the sealing portion 3 and the wells 4a1, 4b1 exposed from the sealing portion 3. The socket 5 is formed from an insulating material such as resin or ceramics.

[0036] The lead wire 6 is electrically connected to the well 4a1 of the first electrode 4a via the socket 5. That is, the lead wire 6 is electrically connected to the filament 4b2 of the first electrode 4a. The lead wire 7 is electrically connected to the well 4b1 of the second electrode 4b via the socket 5. That is, the lead wire 7 is electrically connected to the filament 4b2 of the second electrode 4b.

[0037] The lead wires 6 and 7 are electrically connected to, for example, a high-frequency power supply, etc. The high-frequency power supply is, for example, a power supply that generates a sine wave, a pulse power supply, etc. When a voltage is applied to lead wires 6 and 7 from a high-frequency power supply, a discharge occurs between filament 4b2 of first electrode 4a and filament 4b2 of second electrode 4b. When a discharge occurs in the internal space of bulb 2, electrons generated by the discharge collide with mercury atoms, emitting ultraviolet light with a peak wavelength of 254 nm, or ultraviolet light with peak wavelengths of 185 nm and 254 nm.

[0038] In this case, if the material of the bulb 2 is, for example, quartz glass or synthetic quartz glass, ultraviolet light with a peak wavelength of 254 nm or ultraviolet light with peak wavelengths of 185 nm and 254 nm can be irradiated to the outside of the bulb 2. Furthermore, for example, if the material of the bulb 2 is glass that absorbs ultraviolet light with a peak wavelength of 185 nm and transmits ultraviolet light with a peak wavelength of 254 nm, ultraviolet light with a peak wavelength of 254 nm can be irradiated to the outside of the bulb 2.

[0039] As shown in FIG. 1, the discharge lamp 1 is placed in the liquid 300 via a protective tube 101. Therefore, the temperature of the coldest spot is affected by the temperature of the liquid 300. In this case, the temperature of the liquid 300 to be treated is approximately 0°C to 50°C. For example, if the temperature of the liquid 300 is low (e.g., 0°C), the temperature of the coldest spot may be lower than a predetermined temperature. If the temperature of the liquid 300 is high (e.g., 50°C), the temperature of the coldest spot may be higher than the predetermined temperature. In this case, it is preferable that the temperature of the coldest spot be approximately 40°C. If the temperature of the coldest spot changes depending on the temperature of the liquid 300, the vapor pressure of the mercury vapor may deviate from an appropriate range, and the illuminance of the ultraviolet light emitted from the discharge lamp 1 may decrease.

[0040] In this case, once the use of the liquid treatment device 100 is determined, the temperature of the liquid 300 to be treated can be specified to some extent. Therefore, the distance L1 (mm) can be set according to the specified temperature of the liquid 300. However, doing so increases the number of types of discharge lamps 1, which leads to complication of inventory management of the discharge lamps 1 and an increase in manufacturing costs. Furthermore, if the temperature of the liquid 300 changes, the discharge lamp 1 must be replaced.

[0041] Therefore, the liquid treatment device 100 is provided with a temperature control unit 10 that controls the temperature of the coldest spot of the discharge lamp 1. As shown in FIGS. 1, 2, and 4, the temperature control unit 10 can be provided near the end of the discharge lamp 1 (bulb 2) on the side where the first electrode 4a is provided. In other words, the temperature control unit 10 can be provided in the part of the bulb 2 where the coldest spot is formed. The temperature control unit 10 is provided on the outer surface of the bulb 2, and controls the heat transfer between the coldest spot and the liquid 300.

[0042] As shown in FIG. 4 , the temperature control unit 10 is, for example, cylindrical and covers the outer surface of the bulb 2. For example, the temperature control unit 10 covers the vicinity of the end of the bulb 2 on which the first electrode 4a is provided. The temperature control unit 10 can also cover the outer surface of the sealing unit 3. There may be a small gap between the temperature control unit 10 and the outer surface of the bulb 2, or the temperature control unit 10 and the outer surface of the bulb 2 may be in contact. The temperature control unit 10 can also be attached to the outer surface of the bulb 2 by, for example, elastic force. For example, the cylindrical temperature control unit 10 can be provided with a slit extending in the axial direction of the bulb 2, so that elastic force is generated when the temperature control unit 10 is attached to the bulb 2.

[0043] The temperature control unit 10 can reflect, for example, radiant heat. In this case, the temperature control unit 10 is formed, for example, from a material that has high reflectivity for infrared rays. The temperature control unit 10 can be formed, for example, from a metal such as silver, gold, copper, or aluminum. In this case, considering that the temperature control unit 10 is less susceptible to oxidation and the manufacturing cost, it is preferable to form the temperature control unit 10 from aluminum. If the temperature control unit 10 is made of a material that has high reflectivity for infrared rays, the heat transfer between the coldest part and the liquid 300 can be controlled even if the thickness of the temperature control unit 10a is made thin.

[0044] Furthermore, the temperature control unit 10 may be, for example, one that suppresses heat conduction. In this case, the temperature control unit 10 may be formed, for example, from a material with low thermal conductivity. The temperature control unit 10 may be formed, for example, from a resin such as polypropylene, polystyrene, fluororesin, or polyethylene terephthalate. The temperature control unit 10 may also be formed, for example, from a heat-shrinkable tube. Forming the temperature control unit 10 from a heat-shrinkable tube makes it easier to attach the temperature control unit 10 to the bulb 2 in close contact. If the temperature control unit 10 is made of a material with low thermal conductivity, the heat transfer between the coldest part and the liquid 300 can be controlled.

[0045] FIG. 5 is a graph illustrating the effect of the temperature control unit 10. In FIG. In addition, FIG. 5 shows the case where the above-mentioned distance L1 (mm) is 36 mm. Furthermore, distance L3 (mm) in FIG. 5 is the distance between the end of temperature control unit 10 and the end of sealing unit 3 where first electrode 4a is provided (see FIG. 4). Also, "distance L3 (mm)≦distance L1 (mm)." Note that in Figures 2 and 4, "distance L3 (mm)<distance L1 (mm)."

[0046] As can be seen from FIG. 5, if the temperature control section 10 is provided, the fluctuation range of the illuminance of the ultraviolet light emitted from the discharge lamp 1 can be reduced when the temperature of the liquid 300 changes. Furthermore, by adjusting the distance L3 (mm) according to the temperature of the liquid 300, the illuminance of the ultraviolet light can be increased.

[0047] The heat generated when the discharge lamp 1 is turned on is determined by the input voltage, etc., so the optimum distance L3 (mm) for the temperature of the liquid 300 can be found by simulation or experiment.

[0048] Furthermore, although the above describes changing the length of the temperature control unit 10 in the tube axis direction of the bulb 2, it is sufficient if the relative position between the upper end of the temperature control unit 10 (the end on the second electrode 4b side) and the coldest part can be changed. For example, a temperature control unit 10a of a predetermined length may be used to change the position of the discharge lamp 1 (the position of the coldest part) relative to the upper end of the temperature control unit 10a in the axial direction of the bulb 2. Also, a temperature control unit 10a of a predetermined length may be used to change the position of the upper end of the temperature control unit 10a relative to the position of the discharge lamp 1 (the position of the coldest part) in the axial direction of the bulb 2. Furthermore, a temperature control unit 10 and a temperature control unit 10a may be provided.

[0049] 6 and 7 are schematic diagrams illustrating cases where the position of the discharge lamp 1 relative to the upper end of the temperature control section 10a is changed. 6 and 7, the temperature control unit 10a is, for example, cylindrical and is provided on the lid 102. The end of the discharge lamp 1 on which the first electrode 4a is provided can be provided inside the temperature control unit 10a. The temperature control unit 10a may be in contact with the discharge lamp 1, or a gap may be provided between the temperature control unit 10a and the discharge lamp 1. The material of the temperature control unit 10a can be the same as the material of the temperature control unit 10.

[0050] For example, when the temperature of the liquid 300 is low, as shown in Fig. 6, the distance L4 (mm) between the end of the discharge lamp 1 on the side where the first electrode 4a is provided and the upper end of the temperature control unit 10a is increased. In this way, it is possible to increase the heat from the coldest spot that is blocked by the temperature control unit 10a. Therefore, the heat from the coldest spot is less likely to be transferred to the liquid 300, making it easier to maintain the temperature of the coldest spot at a predetermined temperature even when the temperature of the liquid 300 is low.

[0051] For example, when the temperature of the liquid 300 is high, the distance L4 (mm) is shortened as shown in Fig. 7. In this way, the heat from the coldest part that is blocked by the temperature control unit 10a can be reduced. Therefore, the heat from the coldest part is more easily transferred to the liquid 300, making it easier to maintain the temperature of the coldest part at a predetermined temperature even when the temperature of the liquid 300 is high.

[0052] 7, the distance L4 (mm) can be changed by changing the length of a spacer 11 provided between the discharge lamp 1 and the lid 102. Alternatively, for example, the temperature control unit 10a may hold the discharge lamp 1, and the distance L4 (mm) may be changed by changing the position at which the temperature control unit 10a holds the discharge lamp 1. Alternatively, for example, the lid 102 may be provided with a bolt that comes into contact with the end of the discharge lamp 1 on the side where the first electrode 4a is provided, and the distance L4 (mm) may be changed by changing the length of the bolt protruding from the lid 102.

[0053] Furthermore, the distance L4 (mm) can be changed depending on the temperature of the liquid 300. FIG. 8 is a schematic cross-sectional view illustrating a case where the distance L4 (mm) is changed depending on the temperature of the liquid 300. As shown in FIG. As shown in FIG. 8, for example, a moving section 12 that changes the distance L4 can be provided. The moving part 12 has, for example, a conductive part 12a and a driving part 12b. The conductive portion 12a is, for example, a screw or a ball screw. The conductive portion 12a can be provided, for example, on the lid 102. An end of the conductive portion 12a contacts the end of the discharge lamp 1 on the side where the first electrode 4a is provided.

[0054] The driving unit 12b changes the position of the conductive part 12a based on, for example, a signal from a sensor that detects the temperature of the liquid 300. For example, when the temperature of the liquid 300 is high, the driving unit 12b raises the conductive part 12a to shorten the distance L4. For example, when the temperature of the liquid 300 is low, the driving unit 12b lowers the conductive part 12a to lengthen the distance L4. The drive unit 12b may include, for example, a control motor such as a servo motor.

[0055] Although the case where the position of the discharge lamp 1 relative to the temperature control unit 10a is moved has been described, the position of the temperature control unit 10a may also be moved relative to the discharge lamp 1. For example, the end of the conductive part 12a may be brought into contact with the lower end of the temperature control unit 10a. That is, the moving part 12 may be any part that moves the relative positions of the temperature control part 10a and the discharge lamp 1 in the direction in which the discharge lamp 1 extends, depending on the temperature of the liquid 300.

[0056] If the distance L4 (mm) can be changed according to the temperature of the liquid 300, the temperature of the coldest part can be kept appropriate even if the temperature changes during processing of the liquid 300. Furthermore, since there is no need to provide temperature control units 10 with different lengths for different temperatures of the liquid 300, inventory management can be simplified and productivity can be improved.

[0057] Next, returning to FIG. 1, other elements provided in the liquid treatment device 100 will be described. The discharge lamp 1 cannot be placed directly in the liquid 300. Therefore, the discharge lamp 1 is housed inside a protective tube 101, as shown in FIG.

[0058] The protective tube 101 is cylindrical and has a length (length in the tube axis direction) that is longer than the tube diameter. The protective tube 101 is, for example, a cylindrical tube. Both ends of the protective tube 101 are open. A flange 101a may be provided at the end of the protective tube 101. The protective tube 101 extends inside the container 104. For example, the protective tube 101 extends between a ceiling plate 104b and a bottom plate 104a. The upper end of the protective tube 101 protrudes upward from the ceiling plate 104b. The lower end of the protective tube 101 protrudes downward from the bottom plate 104a.

[0059] At least one discharge lamp 1 is housed in the internal space of the protective tube 101. In the case of the liquid treatment device 100 illustrated in Fig. 1, one discharge lamp 1 is housed in the internal space of the protective tube 101. When one discharge lamp 1 is housed in the internal space of the protective tube 101, the discharge lamp 1 can be provided so as to be approximately coaxial with the protective tube 101. The dimensions of the protective tube 101 can be changed as appropriate depending on the dimensions and number of discharge lamps 1 to be housed.

[0060] There can be provided at least one protective tube 101. As shown in Fig. 1, the internal space of the container 104 serves as a flow path through which the liquid 300 flows. Therefore, the discharge lamp 1 is provided in the liquid 300 via the protective tube 101.

[0061] In this case, the light-emitting length of the discharge lamp 1 is longer than the distance between the bottom plate 104a and the ceiling plate 104b of the container 104. In this way, the light-emitting portion of the discharge lamp 1 is provided throughout the entire internal space of the container 104 in the direction of the central axis of the container 104. Therefore, ultraviolet rays can be irradiated onto the liquid 300 throughout the entire internal space of the container 104, improving the processing efficiency.

[0062] The ultraviolet rays generated in the discharge lamp 1 are irradiated onto the liquid 300 through the protective tube 101. For this reason, the protective tube 101 is made of a material with high transmittance for ultraviolet rays. For example, the protective tube 101 can be made of quartz glass, synthetic quartz glass, or the like.

[0063] When the discharge lamp 1 irradiates the liquid 300 with ultraviolet light, bacteria and viruses contained in the liquid 300 are sterilized or inactivated by the ultraviolet light.

[0064] The lid 102 closes the opening of the protective tube 101. For example, the lid 102 is attached to a flange 101a of the protective tube 101. The lid 102 has a hole penetrating through it in the thickness direction. The lead wires 6 and 7 attached to the discharge lamp 1 are drawn to the outside through the hole provided in the lid 102. The gap between the lead wires 6 and 7 and the inner wall of the hole is sealed with a sealing material. The lid 102 is made of, for example, a metal such as stainless steel or a resin such as a fluororesin.

[0065] The seal member 103 is provided between the lid 102 and the protective tube 101 (flange 101a). The seal member 103 is, for example, an O-ring. By attaching the lid 102 and the seal member 103 to the protective tube 101, the internal space of the protective tube 101 is sealed so as to be airtight.

[0066] Here, if oxygen is present in the internal space of the protective tube 101, there is a risk of attenuating the ultraviolet light irradiated from the discharge lamp 1. For this reason, nitrogen gas or an inert gas can be sealed in the internal space of the protective tube 101, which is sealed by the lid 102 and the sealing member 103.

[0067] The container 104 is cylindrical and has a shape in which the overall length (length in the direction of the central axis) is longer than the cross-sectional dimension (length in the direction perpendicular to the central axis). The container 104 has, for example, a cylindrical shape. The container 104 is made of, for example, a metal such as stainless steel.

[0068] A supply port 104c for the liquid 300 can be provided near the bottom plate 104a on the side of the container 104. A supply device that supplies the liquid 300, for example, can be connected to the supply port 104c. A discharge port 104d for the treated liquid 300a can be provided near the ceiling plate 104b on the side of the container 104. A tank that stores the treated liquid 300a, a cleaning device that uses the liquid 300a, or the like can be connected to the discharge port 104d.

[0069] The opening on the lower side of the container 104 is closed by a bottom plate 104a. The bottom plate 104a and the container 104 are joined liquid-tightly, for example, by welding. Alternatively, for example, a flange may be provided on the container 104, and the bottom plate 104a may be screwed to the flange via a packing or the like. The bottom plate 104a is plate-shaped and is made of a metal such as stainless steel.

[0070] The bottom plate 104a may have a hole 104a1 that penetrates the bottom plate 104a in the thickness direction. For example, the hole 104a1 may be provided in the center of the bottom plate 104a.

[0071] The upper opening of the container 104 is closed by a ceiling plate 104b. The ceiling plate 104b and the container 104 are joined liquid-tightly, for example, by welding. Alternatively, for example, a flange can be provided on the container 104, and the ceiling plate 104b can be screwed to the flange via a packing or the like. The ceiling plate 104b is plate-shaped and made of a metal such as stainless steel.

[0072] The ceiling plate 104b may have a hole 104b1 formed therethrough in the thickness direction, for example, in the center of the ceiling plate 104b.

[0073] The protective tube 101 is provided inside the holes 104a1 and 104b1, so that the hole 104a1 can be provided coaxially with the hole 104b1.

[0074] As described above, the container 104 has a bottom plate 104a provided at the lower end and a ceiling plate 104b provided at the upper end, and has a space inside into which the liquid 300 is supplied.

[0075] The holders 105 are plate-shaped, and for example, a pair of holders can be provided for one protective tube 101. For example, one holder 105 holds the vicinity of the upper end of the protective tube 101. One holder 105 is attached to the ceiling plate 104b, for example, via a sealing member 106. For example, the other holder 105 holds the vicinity of the lower end of the protective tube 101. The other holder 105 is attached to the bottom plate 104a, for example, via a sealing member 106.

[0076] The sealing member 106 is, for example, an O-ring. The sealing member 106 liquid-tightly seals the gap between the protective tube 101 and the inner wall of the hole 104a1 in the bottom plate 104a. The sealing member 106 liquid-tightly seals the gap between the protective tube 101 and the inner wall of the hole 104b1 in the ceiling plate 104b.

[0077] The installation unit 107 has a base 107a and a stand 107b. The installation unit 107 can be made of metal such as iron or stainless steel. The base 107a is provided, for example, on the floor surface of the location where the liquid treatment device 100 is installed. The base 107a is plate-shaped and faces the bottom plate 104a of the container 104. The stand 107b is column-shaped and is provided between the bottom plate 104a of the container 104 and the base 107a. For example, a plurality of stands 107b can be provided. If the stand 107b is provided, a space can be provided between the bottom plate 104a of the container 104 and the base 107a. As shown in FIG. 1 , the lower end of the protective tube 101 and the lid 102 can be provided in the space between the bottom plate 104a of the container 104 and the base 107a.

[0078] Although the liquid treatment device 100 is illustrated as being installed on the floor of the installation location, the present invention is not limited to this. For example, the liquid treatment device 100 can also be installed on the ceiling of the installation location. In this case, the installation unit 107 can be installed on, for example, the ceiling plate 104b of the container 104. For example, the liquid treatment device 100 can also be installed on a wall of the installation location. In this case, the installation unit 107 can be installed on, for example, the side of the container 104.

[0079] Although several embodiments of the present invention have been described above, these embodiments are presented by way of example only and are not intended to limit the scope of the invention. These novel embodiments can be embodied in various other forms, and various omissions, substitutions, modifications, etc. can be made without departing from the spirit of the invention. These embodiments and their modifications are included within the scope and spirit of the invention, as well as within the scope of the invention and its equivalents as set forth in the claims. Furthermore, the above-described embodiments can be implemented in combination with each other. [Explanation of symbols]

[0080] 1 discharge lamp, 2 bulb, 4a first electrode, 4b second electrode, 4b2 filament, 5 socket, 10 temperature control section, 10a temperature control section, 11 spacer, 12 moving section, 100 liquid treatment device, 101 protective tube, 102 lid, 104 container, 300 liquid, 300a liquid

Claims

1. A liquid treatment device that irradiates a liquid with ultraviolet light, a container having a space therein into which the liquid is supplied; at least one protective tube extending through the interior of the container; at least one discharge lamp extending inside the protective tube and capable of irradiating the ultraviolet light; a temperature control unit provided near one end of the discharge lamp; a moving unit that moves the relative positions of the temperature control unit and the discharge lamp in the extension direction of the discharge lamp in accordance with the temperature of the liquid; Equipped with The discharge lamp is a bulb having a cylindrical shape and an internal space filled with a rare gas and mercury, or a rare gas and amalgam; a seal provided at each of the opposite ends of the valve; a first electrode provided in one of the sealing portions and exposed to the internal space of the bulb; a second electrode provided in the other sealing portion and exposed to the internal space of the bulb; and a distance between an end of the first electrode exposed to the internal space of the bulb and an end of a sealing portion on which the first electrode is provided is longer than a distance between an end of the second electrode exposed to the internal space of the bulb and an end of the sealing portion on which the second electrode is provided; The temperature control unit is a liquid treatment device that covers the vicinity of the end of the bulb on the side where the first electrode is provided, and controls the temperature of the coldest part of the discharge lamp.

2. The distance between the end of the first electrode exposed to the internal space of the bulb and the end of the sealing portion on which the first electrode is provided is defined as L1 (mm), 2. The liquid treatment device according to claim 1, wherein the following formula is satisfied when the outer diameter of the valve is D (mm): 0.34<D(mm) / L1(mm)<1.0

3. 3. The liquid treatment device according to claim 1, wherein an end of the discharge lamp on which the first electrode is provided is located lower in the direction of gravity than an end of the discharge lamp on which the second electrode is provided.

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