Ultraviolet lamp and fluid treatment device

Abstract

To provide an ultraviolet lamp and a fluid treatment device that can restrain a decrease in the illuminance of ultraviolet light to be irradiated to the outside even when a power supply line is fixed to the outer surface of an arc tube.SOLUTION: A fluid treatment device includes an arc tube having a cylindrical shape, a first electrode provided on one end side of the arc tube, a second electrode provided on the other end side of the arc tube, a first power supply line electrically connected to the first electrode, a second power supply line electrically connected to the second electrode and extending along the outer surface of the arc tube, and at least one holding portion which transmits therethrough ultraviolet light irradiated from the arc tube and fixes the second power supply line to the outer surface of the arc tube.SELECTED DRAWING: Figure 1

Description

Technical Field

[0001] Embodiments of the present invention relate to an ultraviolet lamp and a fluid treatment apparatus.

Background Art

[0002] There is a fluid treatment apparatus that irradiates a fluid such as a liquid or a gas with ultraviolet rays to perform, for example, a chemical reaction such as a polymerization reaction, sterilization of bacteria contained in the fluid, inactivation of viruses, and decomposition of organic substances. Such a fluid treatment apparatus is provided with an ultraviolet lamp that irradiates ultraviolet rays.

[0003] Here, power supply lines are electrically connected to both ends on both sides of the ultraviolet lamp. In this case, one power supply line may extend along the outer surface of the arc tube of the ultraviolet lamp and may be drawn out to the outside together with the other power supply line.

[0004] In this case, when the ultraviolet lamp is lit, heat is generated together with ultraviolet rays. When heat is generated, the temperature of the power supply line extending along the outer surface of the arc tube of the ultraviolet lamp rises, causing expansion of the power supply line and thus sagging of the power supply line. In this case, if the power supply line is fixed to the outer surface of the arc tube using a band or the like, it is possible to suppress the sagging of the power supply line.

[0005] However, simply fixing the power supply line to the outer surface of the arc tube may cause a part of the ultraviolet rays irradiated from the arc tube to be blocked by the band, resulting in a decrease in the illuminance of the ultraviolet rays irradiated to the outside.

[0006] Therefore, even when the power supply line is fixed to the outer surface of the arc tube, it has been desired to develop a technique capable of suppressing a decrease in the illuminance of the ultraviolet rays irradiated to the outside.

Prior Art Documents

Patent Documents

[0007]

Patent Document 1

[0008] The problems to be solved by the present invention are to provide an ultraviolet lamp capable of suppressing a decrease in the illuminance of ultraviolet rays irradiated to the outside even when a power supply line is fixed to the outer surface of a discharge tube, and a fluid treatment apparatus. Means for Solving the Problems

[0009] The fluid treatment apparatus according to the embodiment includes: a discharge tube having a cylindrical shape; a first electrode provided on one end side of the discharge tube; a second electrode provided on the other end side of the discharge tube; a first power supply line electrically connected to the first electrode; a second power supply line electrically connected to the second electrode and extending along the outer surface of the discharge tube; and at least one holding portion that transmits ultraviolet rays irradiated from the discharge tube and fixes the second power supply line to the outer surface of the discharge tube. Effects of the Invention

[0010] According to the embodiment of the present invention, it is possible to provide an ultraviolet lamp capable of suppressing a decrease in the illuminance of ultraviolet rays irradiated to the outside even when a power supply line is fixed to the outer surface of a discharge tube, and a fluid treatment apparatus. Brief Description of the Drawings

[0011]

Figure 1

Figure 2

Figure 3

Figure 4

Mode for Carrying Out the Invention

[0012] Hereinafter, embodiments will be exemplified with reference to the drawings. In each drawing, the same reference numerals are given to the same components, and detailed descriptions thereof are omitted as appropriate. The fluid treatment apparatus 100 according to the present embodiment irradiates the fluid 300 to be treated with ultraviolet rays. The fluid 300 is, for example, a liquid containing water, air, an adhesive, ink, or the like. Hereinafter, as an example, the case where the fluid 300 is a liquid containing water will be described.

[0013] FIG. 1 is a schematic cross-sectional view for exemplifying the fluid treatment apparatus 100 according to the present embodiment. FIG. 2 is a schematic cross-sectional view for exemplifying the vicinity of the end of the ultraviolet lamp 1 in FIG. 1. FIG. 3 is a cross-sectional view taken along line A-A of the protective tube 101 and the ultraviolet lamp 1 in FIG. 1.

[0014] As shown in FIG. 1, the fluid treatment apparatus 100 includes, for example, a protective tube 101, a lid 102, a seal member 103, a container 104, a holder 105, a seal member 106, a supply unit 107, a discharge unit 108, and an ultraviolet lamp 1.

[0015] When the fluid 300 is a liquid containing water, the ultraviolet lamp 1 cannot be directly provided in the fluid 300. Therefore, the ultraviolet lamp 1 is housed inside the protective tube 101. When the fluid 300 is air or the like, the protective tube 101 can be omitted. Further, depending on the use of the fluid treatment apparatus 100, it is sufficient that the ultraviolet lamp 1 and a holder or the like for holding the ultraviolet lamp 1 are provided. For example, when the fluid treatment apparatus 100 is used for curing an adhesive, ink, or the like, sterilizing bacteria contained in air, inactivating a virus, or the like, it is sufficient that the ultraviolet lamp 1 and a holder or the like for holding the ultraviolet lamp 1 are provided.

[0016] The protective tube 101 is cylindrical and has a shape with a longer overall length (length in the direction along the tube axis) compared to the tube diameter. The protective tube 101 can be, for example, a circular tube. One end of the protective tube 101 is open, and the other end is closed. A flange 101a can be provided at the end on the open side of the protective tube 101.

[0017] The protective tube 101 extends between the end plate 104b of the container 104 and the end plate 104a of the container 104. The end on the open side of the protective tube 101 protrudes from the end plate 104b. The end on the closed side of the protective tube 101 protrudes from the end plate 104a.

[0018] At least one ultraviolet lamp 1 is housed in the internal space of the protective tube 101. In the case of the fluid treatment apparatus 100 illustrated in FIG. 1, one ultraviolet lamp 1 is housed in the internal space of the protective tube 101. When one ultraviolet lamp 1 is housed in the internal space of the protective tube 101, the ultraviolet lamp 1 can be provided so as to be substantially concentric with the protective tube 101. The dimensions of the protective tube 101 can be appropriately changed according to the dimensions and number of the housed ultraviolet lamp 1 (emission tube 2).

[0019] The protective tube 101 is provided in the internal space of the container 104. As shown in FIG. 1, the internal space of the container 104 serves as a flow path through which the fluid 300 flows. Therefore, if the protective tube 101 provided with the ultraviolet lamp 1 is provided in the internal space of the container 104, the ultraviolet lamp 1 will be provided in the flow path of the fluid 300.

[0020] The ultraviolet rays generated in the ultraviolet lamp 1 are irradiated onto the fluid 300 through the protective tube 101. Therefore, the protective tube 101 is formed of a material with a high ultraviolet transmittance. For example, the protective tube 101 is formed of a material containing SiO2 such as quartz glass or synthetic quartz glass.

[0021] The lid 102 closes the opening of the protective tube 101. For example, the lid 102 is attached to the flange 101a of the protective tube 101. The lid 102 is provided with a hole penetrating in the thickness direction. The power supply line 6 (corresponding to an example of the first power supply line) and the power supply line 7 (corresponding to an example of the second power supply line) provided on the ultraviolet lamp 1 are drawn out to the outside through the hole provided in the lid 102. The lid 102 is formed of, for example, a metal such as stainless steel or a resin such as fluororesin.

[0022] The seal member 103 is provided between the lid 102 and the protective tube 101 (flange 101a). The seal member 103 can be, for example, an O-ring or the like. 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 to be liquid-tight.

[0023] The container 104 has a cylindrical shape and has a form in which the overall length (dimension in the direction along the central axis) is longer than the cross-sectional dimension (dimension in the direction perpendicular to the central axis). The container 104 can be, for example, a cylindrical tube. The container 104 is formed of, for example, a metal such as stainless steel.

[0024] One end of the container 104 in the direction along the central axis of the container 104 is closed by an end face plate 104a. The end face plate 104a is joined to the end of the container 104 so as to be liquid-tight. The end face plate 104a has a plate shape and is formed of, for example, a metal such as stainless steel.

[0025] The end face plate 104a is provided with a hole 104a1 penetrating in the thickness direction. For example, the hole 104a1 is provided at the center of the end face plate 104a. For example, near the end of the protective tube 101 on the side opposite to the side where the flange 101a is provided is provided inside the hole 104a1.

[0026] The other end of the container 104 in the direction along the central axis of the container 104 is blocked by the end face plate 104b. The end face plate 104b is joined to the end of the container 104 in a liquid-tight manner. The end face plate 104b is plate-shaped and is formed of a metal such as stainless steel, for example.

[0027] The end face plate 104b is provided with a hole 104b1 penetrating in the thickness direction. For example, the hole 104b1 is provided at the center of the end face plate 104b. For example, in the vicinity of the end of the protective tube 101 on the side where the flange 101a is provided is provided inside the hole 104b1.

[0028] The holder 105 is plate-shaped and, for example, a pair can be provided for one protective tube 101. For example, one holder 105 holds the vicinity of the end of the protective tube 101 on the flange 101a side. One holder 105 is attached to the end face plate 104b via a seal member 106, for example. For example, the other holder 105 holds the vicinity of the end of the protective tube 101 on the side opposite to the flange 101a side. The other holder 105 is attached to the end face plate 104a via a seal member 106, for example.

[0029] The seal member 106 is annular. The protective tube 101 is inserted into the seal member 106. The seal member 106 is, for example, an O-ring or the like. The seal member 106 seals the gap between the protective tube 101 and the inner wall of the hole 104a1 of the end face plate 104a in a liquid-tight manner. The seal member 106 seals the gap between the protective tube 101 and the inner wall of the hole 104b1 of the end face plate 104b in a liquid-tight manner.

[0030] The supply part 107 is tubular, and one end thereof is joined to the side surface of the container 104 in a liquid-tight manner. The internal space of the supply part 107 is connected to the internal space of the container 104. The internal space of the supply part 107 serves as a supply flow path for the fluid 300. For example, a supply device for supplying the fluid 300 or the like can be connected to the other end of the supply part 107. The supply part 107 is formed of a metal such as stainless steel, for example.

[0031] The discharge part 108 is tubular, and one end thereof is joined to the side surface of the container 104 in a liquid-tight manner. In the direction along the central axis of the container 104, the discharge part 108 is provided at a position separated from the supply part 107. The internal space of the discharge part 108 is connected to the internal space of the container 104. The internal space of the discharge part 108 serves as a discharge flow path for the processed fluid 300a. For example, a tank for storing the processed fluid 300a, a cleaning device using the fluid 300a, etc. can be connected to the other end of the discharge part 108. The discharge part 108 is formed of, for example, a metal such as stainless steel.

[0032] At least one ultraviolet lamp 1 can be provided. The fluid treatment device 100 illustrated in FIG. 1 is provided with one ultraviolet lamp 1. The ultraviolet lamp 1 can be, for example, a discharge lamp that irradiates ultraviolet rays. The discharge lamp that irradiates ultraviolet rays is, for example, a low-pressure mercury lamp, a mercury xenon lamp, a metal halide lamp, etc. Hereinafter, as an example, the case where the ultraviolet lamp 1 is a low-pressure mercury lamp will be described. The ultraviolet lamp 1 is provided inside the protective tube 101 and extends between the end face plate 104b and the end face plate 104a of the container 104.

[0033] The ultraviolet lamp 1 has, for example, a light-emitting tube 2, a conductive part 3, electrodes 4 (corresponding to an example of a first electrode and a second electrode), a holder 5, a power supply line 6, a power supply line 7, and a holding part 8.

[0034] The light-emitting tube 2 is tubular and has a form in which the overall length (the length in the direction along the tube axis) is long compared to the tube diameter. The light-emitting tube 2 is, for example, a cylindrical tube. The outer diameter of the light-emitting tube 2 can be, for example, 10 mm or more and 25 mm or less. The wall thickness of the light-emitting tube 2 can be, for example, about 1 mm.

[0035] The length of the light-emitting tube 2 can be appropriately changed according to the specifications of the fluid treatment device 100, etc. For example, it is preferable that the light-emitting length of the ultraviolet lamp 1 is longer than the distance between the end face plate 104a and the end face plate 104b of the container 104.

[0036] At both ends of the arc tube 2 along the tube axis direction, sealing portions 2a are provided. By providing the sealing portions 2a, the internal space of the arc tube 2 can be hermetically sealed. The sealing portions 2a can be formed, for example, by using a pinch seal method or a shrink seal method.

[0037] The internal space of the arc tube 2 is filled with gas and mercury. The gas filled in the internal space of the arc tube 2 can be appropriately changed according to the use of the ultraviolet lamp 1. The gas filled in the internal space of the arc tube 2 can be, for example, a noble gas such as krypton, xenon, argon, neon, or a mixed gas in which a plurality of types of noble gases are mixed. Further, the gas can also include a halogen gas or the like as necessary.

[0038] The pressure of the gas (enclosure pressure) in the internal space of the arc tube 2 at 25°C is, for example, about 67 Pa to 1330 Pa. The pressure of the gas (enclosure pressure) in the internal space of the arc tube 2 at 25°C can be obtained based on the standard state of the gas (SATP (Standard Ambient Temperature and Pressure): temperature 25°C, 1 bar).

[0039] The arc tube 2 is formed of a material that transmits ultraviolet rays. Therefore, the ultraviolet rays generated in the internal space of the arc tube 2 are irradiated to the outside through the arc tube 2. Details regarding the material of the arc tube 2 will be described later.

[0040] The electrodes 4 are provided at both ends of the arc tube 2 along the tube axis direction. A pair of electrodes 4 are provided facing each other.

[0041] As shown in FIG. 2, the electrode 4 has, for example, a filament 4a with an emitter coated on the surface, and two inner lead wires 4b connected to both ends of the filament 4a.

[0042] The conductive part 3 is connected to the inner lead wire 4b and is provided inside the sealing part 2a. The conductive part 3 can be provided one for one inner lead wire 4b, for example. The planar shape of the conductive part 3 can be square. The conductive part 3 has a thin film shape. The conductive part 3 can be formed from, for example, molybdenum foil.

[0043] The conductive part 3 is connected to the outer lead wire 4c on the side opposite to the connection side of the inner lead wire 4b. The outer lead wire 4c is led out of the sealing part 2a and is connected to the power supply wire 6 or the power supply wire 7.

[0044] The holder 5 has a cylindrical shape, one end side is provided inside the sealing part 2a, and the other end side is exposed from the sealing part 2a. One holder 5 can be provided for one sealing part 2a. The holder 5 is formed from an insulating material. The holder 5 is formed from, for example, an inorganic material such as ceramics or a resin.

[0045] A pair of power supply wires 6 are provided. The pair of power supply wires 6 are electrically connected to the electrode 4 provided on the opening side of the protective tube 101. One of the power supply wires 6 is electrically connected to one end of the corresponding electrode 4 via the conductive part 3. The other power supply wire 6 is electrically connected to the other end of the corresponding electrode 4 via the conductive part 3. The vicinity of the ends of the pair of power supply wires 6 on the conductive part 3 side is provided inside the holder 5. The ends of the pair of power supply wires 6 on the side opposite to the conductive part 3 side are drawn out from the lid 102. Crimp terminals, connectors, etc. are electrically connected to the ends of the pair of power supply wires 6 drawn out from the lid 102.

[0046] A pair of power supply lines 7 are provided. The pair of power supply lines 7 are electrically connected to the electrode 4 provided on the closed side of the protective tube 101. One of the power supply lines 7 is electrically connected to one end of the corresponding electrode 4 via the conductive portion 3. The other power supply line 7 is electrically connected to the other end of the corresponding electrode 4 via the conductive portion 3. As shown in FIG. 1, the pair of power supply lines 7 extend along the outer surface of the light-emitting tube 2. The ends of the pair of power supply lines 7 on the side opposite to the conductive portion 3 side are drawn out from the lid 102. Crimp terminals, connectors, etc. are electrically connected to the ends of the pair of power supply lines 7 drawn out from the lid 102.

[0047] The pair of power supply lines 6 and the pair of power supply lines 7 are electrically connected to, for example, a ballast. The ballast mainly controls so that values such as the value of the lamp current and the value of the lamp power of the ultraviolet lamp 1 are within a predetermined range.

[0048] As shown in FIGS. 1 and 3, the holding portion 8 fixes a pair of power supply lines 7 extending along the outer surface of the light-emitting tube 2 to the outer surface of the light-emitting tube 2.

[0049] Here, when a voltage is applied to the pair of power supply lines 6 and the pair of power supply lines 7 by the ballast, a discharge occurs between the pair of electrodes 4. When a discharge occurs in the internal space of the light-emitting tube 2, ultraviolet rays with peak wavelengths of 185 nm and 254 nm are radiated from the mercury contained in the internal space.

[0050] As described above, the light-emitting tube 2 and the protective tube 101 are formed of a material that transmits ultraviolet rays. Therefore, the ultraviolet rays generated in the internal space of the light-emitting tube 2 pass through the light-emitting tube 2 and are radiated into the space between the light-emitting tube 2 and the protective tube 101. The ultraviolet rays radiated into the space between the light-emitting tube 2 and the protective tube 101 pass through the protective tube 101 and irradiate the fluid 300 flowing inside the container 104.

[0051] In this case, when the ultraviolet lamp 1 is lit, heat is generated along with ultraviolet rays. When heat is generated, the temperature of the pair of power supply lines 7 extending along the outer surface of the arc tube 2 rises, which may cause the pair of power supply lines 7 to expand and thus sag to occur in the pair of power supply lines 7. If a holding portion 8 for fixing the pair of power supply lines 7 to the outer surface of the arc tube 2 is provided, it is possible to suppress the occurrence of sag in the pair of power supply lines 7 when the ultraviolet lamp 1 is lit.

[0052] At least one holding portion 8 can be provided. The ultraviolet lamp 1 illustrated in FIG. 1 is provided with five holding portions 8. However, the number, arrangement pitch, and width dimension (dimension in the direction along the tube axis) of the holding portion 8 can be appropriately changed according to, for example, the length of the arc tube 2. For example, the number, arrangement pitch, and width dimension of the holding portion 8 can be appropriately set so that at least either one of the pair of power supply lines 7 does not contact the inner wall of the protective tube 101 when the ultraviolet lamp 1 is lit.

[0053] Further, the holding portion 8 is preferably made to be capable of shrinking by heating, for example. If the holding portion 8 is capable of shrinking by heating, the pair of power supply lines 7 can be easily fixed to the outer surface of the arc tube 2 by heating the holding portion 8. Also, it becomes easy to arbitrarily set the fixing position of the pair of power supply lines 7.

[0054] Here, as described above, when the ultraviolet lamp 1 is lit, ultraviolet rays with peak wavelengths of 185 nm and 254 nm are generated inside the arc tube 2. In this case, if there is a gas containing oxygen (for example, air) in the space between the arc tube 2 and the protective tube 101, the ultraviolet rays with a wavelength of 185 nm are absorbed by the oxygen, and oxygen atoms in the ground state are generated. The generated oxygen atoms combine with oxygen molecules to generate ozone. Since ozone absorbs ultraviolet rays with a wavelength of 254 nm, the illuminance of the ultraviolet rays with a wavelength of 254 nm irradiated to the fluid 300 will decrease.

[0055] This also applies to the case where the protective tube 101 is not provided as described above (for example, when the ultraviolet lamp 1 is directly provided in the air). However, if the protective tube 101 is provided, the space between the arc tube 2 and the protective tube 101 becomes a closed space, so the decrease in the illuminance of ultraviolet light with a wavelength of 254 nm becomes more significant.

[0056] When the illuminance of ultraviolet light with a wavelength of 254 nm decreases, the processing ability of the fluid processing apparatus 100 may decrease. For example, the DNA or RNA of bacteria and viruses is likely to absorb ultraviolet light with a wavelength of 254 nm. Therefore, when the illuminance of ultraviolet light with a wavelength of 254 nm decreases, the bactericidal effect on bacteria and the inactivation effect on viruses may decrease.

[0057] In this case, if the space between the arc tube 2 and the protective tube 101 is filled with an inert gas, generation of ozone can be suppressed. However, if this is done, it becomes necessary to maintain the airtightness of the space between the arc tube 2 and the protective tube 101, which leads to an increase in manufacturing cost and a decrease in maintainability.

[0058] Therefore, in the ultraviolet lamp 1 according to the present embodiment, an arc tube 2 containing ozone-free glass is used. For example, it is preferable that the ozone-free glass significantly suppresses the transmission of ultraviolet light with a wavelength of 220 nm or less. For example, the ozone-free glass can have a transmittance of ultraviolet light with a wavelength of 220 nm or less of several percent or less.

[0059] Also, as shown in FIGS. 1 and 3, the holding portion 8 is provided on the outer surface of the arc tube 2. Therefore, a part of the ultraviolet light generated inside the arc tube 2 enters the holding portion 8. In this case, if the holding portion 8 is formed of a material that does not transmit ultraviolet light, such as metal, a part of the ultraviolet light generated inside the arc tube 2 is blocked, and the illuminance of the ultraviolet light irradiated from the ultraviolet lamp 1 decreases. When the illuminance of the ultraviolet light irradiated from the ultraviolet lamp 1 decreases, the processing ability of the fluid processing apparatus 100 decreases.

[0060] Therefore, the holding part 8 preferably contains a material that transmits ultraviolet rays and has high resistance to ultraviolet rays. If the arc tube 2 contains ozone-free glass, it is possible to suppress the generation of ozone in the vicinity of the holding part 8. Therefore, the resistance of the holding part 8 to ozone does not necessarily have to be high. For example, the holding part 8 can contain a fluororesin such as FEP (Fluorinated Ethylene Propylene).

[0061] Figure 4 is a table for exemplifying the relationship between the material of the holding part 8 and the illuminance of ultraviolet rays with a wavelength of 254 nm irradiated from the ultraviolet lamp 1. Note that the illuminance in Table 3 is the relative illuminance with respect to the illuminance when the holding part 8 is not provided. For example, the illuminance when the holding part 8 is not provided is 100%. Further, the illuminance is the illuminance when the ultraviolet lamp 1 is lit for 6000 hours.

[0062] Also, the outer diameter of the arc tube 2 is 19 mm, the gas enclosed inside the arc tube 2 is a mixed gas of 80% neon and 20% argon, the enclosure pressure is 133 Pa, the distance between the electrodes 4 and 4 is 900 mm, the lamp voltage is 100 Vrms, the lamp current is 2.1 Arms, the lamp power is 210 W, the width dimension (dimension in the direction along the tube axis) of the holding part 8 is 10 mm, and the number of the holding parts 8 is four.

[0063] As can be seen from Figure 4, if the material of the holding part 8 is FEP, it is possible to suppress the decrease in the illuminance of the ultraviolet rays irradiated from the ultraviolet lamp 1 to less than 1%. That is, it is possible to suppress the decrease in the processing ability of the fluid processing apparatus 100.

[0064] Also, as described above, it is preferable that the holding part 8 can shrink by heating. Therefore, the holding part 8 can be, for example, a heat-shrinkable tube containing a fluororesin such as FEP. If it is a heat-shrinkable tube containing a fluororesin such as FEP, the pair of power supply lines 7 can be easily fixed by heating the holding part 8 to 150°C to 200°C. Also, it becomes easy to arbitrarily set the fixing positions of the pair of power supply lines 7. Further, since a heat-shrinkable tube containing a fluororesin such as FEP can be easily cut using a cutter or the like, workability such as maintenance can be improved.

[0065] Also, when the ultraviolet lamp 1 is lit, the temperature of the outer surface of the arc tube 2 becomes high. In this case, the temperature in the vicinity of the end of the arc tube 2 where the electrode 4 is provided becomes higher than the temperature of the central portion of the arc tube 2. Although a fluororesin such as FEP has heat resistance, it is preferable not to provide the holding part 8 in a portion where the temperature of the arc tube 2 becomes 200°C or higher.

[0066] As shown in FIG. 1, when the distance L (mm) from the tip of the electrode 4 becomes 20 mm or more in the direction along the tube axis, the temperature of the outer surface of the arc tube 2 becomes substantially constant. Therefore, it is preferable to provide the holding part 8 at a position 20 mm or more away from the tip of the electrode 4 in the direction along the tube axis.

[0067] As described above, some embodiments of the present invention have been illustrated, but these embodiments are presented as examples and are not intended to limit the scope of the invention. These novel embodiments can be implemented in various other forms, and various omissions, replacements, changes, etc. can be made without departing from the gist of the invention. These embodiments and their modifications are included in the scope and gist of the invention, and are included in the invention described in the claims and its equivalent scope. Also, the above-described embodiments can be implemented in combination with each other.

[0068] Hereinafter, an appendix regarding the above-described embodiment is shown.

[0069] (Appendix 1) a light-emitting tube having a tubular shape; a first electrode provided on one end side of the light-emitting tube; a second electrode provided on the other end side of the light-emitting tube; a first power supply line electrically connected to the first electrode; a second power supply line electrically connected to the second electrode and extending along the outer surface of the light-emitting tube; at least one holding portion that transmits ultraviolet rays irradiated from the light-emitting tube and fixes the second power supply line to the outer surface of the light-emitting tube; an ultraviolet lamp comprising the above.

[0070] (Appendix 2) The ultraviolet lamp according to Appendix 1, wherein the holding portion contains a fluororesin and is capable of shrinking by heating.

[0071] (Appendix 3) The ultraviolet lamp according to Appendix 1 or 2, wherein the light-emitting tube contains ozone-free glass.

[0072] (Appendix 4) An ultraviolet lamp according to any one of Appendices 1 to 3; a protective tube having a tubular shape and housing the ultraviolet lamp; a fluid treatment device comprising the above.

[0073] (Appendix 5) One end of the protective tube is open and the other end is closed, The first power supply line and the second power supply line provided on the ultraviolet lamp are drawn out to the outside from the opening of the protective tube. The fluid treatment device according to Appendix 4.

Explanation of Signs

[0074] 1 ultraviolet lamp, 2 light-emitting tube, 4 electrode, 6 power supply line, 7 power supply line, 8 holding portion, 100 fluid treatment device, 101 protective tube, 300 liquid, 300a liquid

Claims

1. A light-emitting tube having a cylindrical shape; A first electrode provided on one end side of the light-emitting tube; A second electrode provided on the other end side of the light-emitting tube; A first power supply line electrically connected to the first electrode; A second power supply line electrically connected to the second electrode and extending along the outer surface of the light-emitting tube; At least one holding portion that transmits ultraviolet rays irradiated from the light-emitting tube and fixes the second power supply line to the outer surface of the light-emitting tube; An ultraviolet lamp comprising the above.

2. The ultraviolet lamp according to Claim 1, wherein the holding portion contains a fluororesin and is capable of shrinking by heating.

3. The ultraviolet lamp according to Claim 1 or 2, wherein the light-emitting tube contains ozone-free glass.

4. The ultraviolet lamp according to Claim 1; A protective tube having a cylindrical shape and housing the ultraviolet lamp; A fluid treatment apparatus comprising the above.

5. One end of the protective tube is open and the other end is closed, The fluid treatment apparatus according to Claim 4, wherein the first power supply line and the second power supply line provided on the ultraviolet lamp are drawn out to the outside from the opening of the protective tube.

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