JP4032297B2 - UV irradiation equipment - Google Patents

Description

[0001]
BACKGROUND OF THE INVENTION
The present invention relates to an ultraviolet irradiation apparatus, and more particularly to an ultraviolet irradiation apparatus that immerses in treated water and irradiates the treated water with ultraviolet light.
[0002]
[Prior art]
As an ultraviolet irradiation device used for water treatment, an ultraviolet irradiation device manufactured by UV Systec shown in FIG. 7 is known. The illustrated apparatus is configured to include a protective tube 1 disposed with its axis line in the vertical direction, and a W-shaped discharge tube 15 </ b> A disposed inside the protective tube 1. A mercury reservoir 3 protruding in a narrow tubular shape is provided at the bottom of the discharge tube 15A. A cooling block 4A is disposed around the mercury reservoir 3, and a cooling fan 8 is provided below the cooling block 4A. Is provided. Then, the outside air is sucked by the cooling fan 8 and blown upward toward the cooling block 4A, and the cooling air that has passed through the cooling block 4A rises along the discharge tube 15A inside the protection tube 1 to protect it. Exhaust gas is exhausted from the upper end of the tube 1. The cooling block 4A includes an electric heater connected to a power source.
[0003]
That is, the temperature of the mercury reservoir 3 is controlled by a combination of heating by the electric heater and air cooling by a cooling fan, so that the mercury vapor pressure in the discharge tube 15A is maintained in an appropriate range.
[0004]
In addition, as an ultraviolet irradiation device provided with a mercury reservoir protruding in a thin tube on a discharge tube, in addition to the ultraviolet irradiation device of UV Systec, Patent Document 1, Patent Document 2, Patent Document 3, Patent Document 4 and the like There is what is described.
[0005]
[Patent Document 1]
Japanese Patent Laid-Open No. 7-45238
[Patent Document 2]
JP-A-7-289617
[Patent Document 3]
JP-A-8-71546
[Patent Document 4]
JP 2002-102317 A
[Problems to be solved by the invention]
The above-mentioned prior art is a system in which the mercury reservoir is controlled to the optimum temperature range by turning on and off the electric heater with a temperature sensor while continuously cooling the mercury reservoir with a cooling fan by a cooling block with outside air. The air temperature is affected by the climate, and the specific heat of air is smaller than that of water, so that there is a problem that a large capacity fan is required to improve the accuracy of temperature control.
[0006]
The prior art also requires the lower end of the protective tube to communicate with the outside air in order to take in the outside air and cool the mercury reservoir. For this reason, when the ultraviolet irradiation device is used for water treatment, it is necessary to dispose the protective tube through the bottom of the flow path of the treated water, and to form a flow path for the outside air below the flow path. There was a problem that the configuration was complicated.
[0007]
  This invention makes it a subject to provide the ultraviolet irradiation device which can cool a mercury reservoir effectively even if it is a protection tube with which the bottom part was closed.
[0008]
[Means for Solving the Problems]
  In order to maximize the UV generation efficiency, it is known that a location where the mercury exists as a droplet (the coldest point) is formed in a part of the discharge tube, and the temperature of the mercury droplet is controlled to 40 to 45 ° C. ing. The inventors pay attention to the fact that the temperature of the treated water is usually 10 to 30 ° C. in the case of an ultraviolet irradiation device used for water treatment, and use the treated water as a cooling source to solve the above problem.It came to solve.
[0009]
  Above issuesSolveAccording to a first means of the present invention, a UV lamp including a discharge tube in which mercury vapor is sealed is installed in a protective tube having a closed bottom, and the protective tube having the UV lamp is immersed in a processing solution. An ultraviolet irradiation device for irradiating the treatment liquid with ultraviolet rays, comprising a mercury reservoir formed in the discharge tube, and a heating means, arranged around the mercury reservoir and transferring heat of the mercury reservoir.heatHeat dissipation block, the heat dissipation block and the protective tubeHeat transfer provided in contact withAnd means.
[0010]
  According to the above configuration, the heat of the mercury reservoir is as follows: mercury reservoir → heat dissipation block →Heat transferIt is transmitted in the order of means → protection pipe, and discharged from the protection pipe to the treated water flowing around the protection pipe. Therefore, it is possible to control the temperature of the mercury reservoir within the target temperature range without cooling by the cooling fan. The heat dissipation rate isHeat transferIt can be adjusted by changing the contact area between the means and the protective tube. The temperature control is performed by turning on and off the heating means. Further, since the bottom of the protective tube is closed, it is not necessary to provide an air flow path for introducing cooling air in the treated water flow path when immersed in the treated water, and installation and maintenance are easy.
[0011]
  According to a second means of the present invention for solving the above problem, in the first means, the heat dissipation block includes a heat dissipation fin,Heat transferThe means includes a metal cooling plate having one surface fixed to the fin of the heat dissipation block and the other surface in contact with the inner surface of the protective tube.
[0012]
According to the above configuration, in addition to the effect of the first means, by providing a metal cooling plate, the amount of heat released to the protective tube is increased, and the temperature of the mercury reservoir is more reliably controlled within the target temperature range. It becomes possible to do.
[0013]
  According to a third means of the present invention for solving the above-mentioned problem, a UV lamp comprising a discharge tube filled with mercury vapor is provided in a protective tube having a closed bottom, and the protective tube including the UV lamp is processed. An ultraviolet irradiation device for irradiating the treatment liquid with ultraviolet rays by immersing in the liquid, comprising a mercury reservoir formed in the discharge tube and a heating means, arranged around the mercury reservoir and transferring heat of the mercury reservoir.heatAnd a cooling fan that is disposed below the heat dissipation block and blows cooling air upward.
[0014]
According to the above configuration, the air in contact with the inner wall of the protective tube is cooled by the treated water flowing outside the protective tube by convective heat transfer flowing through the protective tube wall. The cooled and increased specific gravity of the air descends along the inner wall of the protective tube, reaches the bottom of the protective tube, and then is sucked by the cooling fan and blown upward. While the air blown upwards rises, the heat dissipation block is cooled by convection heat transfer. The air that has passed through the heat dissipation block rises in temperature, and further rises while being warmed by the discharge tube along the discharge tube wall. When the upper end of the protective tube is reached, the flow direction is reversed, and it descends again along the inner wall of the protective tube to form a circulating flow. The heat dissipation block is cooled by this forced air circulation. When the mercury reservoir, in other words, the heat dissipation block is cooled more than necessary, it is heated by the heating means, and the coldest point can be kept in a desired temperature range. The heat dissipation speed is determined by the airflow of the cooling fan. Further, since the bottom of the protective tube is closed, it is not necessary to provide an air flow path for introducing cooling air in the treated water flow path when immersed in the treated water, and installation and maintenance are easy.
[0015]
A fourth means of the present invention that achieves the above object is characterized in that, in the third means, the heat dissipation block includes a fin having a heat dissipation surface in the vertical direction. Heat exchange between the heat dissipation block and the cooling air is promoted by the fins, and the air volume of the cooling fan can be reduced. By arranging the fins in the vertical direction, the flow of air blown from the cooling fan becomes smooth, and a circulating flow of air in the protective tube is easily formed.
[0016]
  the aboveTaskTheResolutionAccording to a fifth means of the present invention, a UV lamp comprising a discharge tube filled with mercury vapor is provided in a protective tube having a closed bottom, and the protective tube including the UV lamp is immersed in a processing solution. An ultraviolet irradiation device for irradiating the treatment liquid with ultraviolet rays, comprising a mercury reservoir formed in the discharge tube, and a heating means arranged around the mercury reservoir to transfer heat of the mercury reservoir.heatA heat dissipating block, a cooling fan that is disposed below the heat dissipating block and blows cooling air upward, the heat dissipating block, and the protective tubeHeat transfer provided in contact withAnd an ultraviolet irradiation apparatus characterized by comprising:
[0017]
According to the above configuration, the effects of both the first and third means can be obtained.
[0018]
  It is desirable that the protective tube is closed with a hemispherical lower end or a shape whose diameter is smoothly reduced. AndHeat transferAs a means, when divided into a plurality in the circumferential direction and the UV lamp is inserted into the protective tube,Heat transferIf the lower end of the means (cooling plate) is in contact with the inner surface of the part of the protective tube whose diameter is reduced,Heat transferThe lower end of the means (cooling plate) slides in contact with the inner surface,Heat transferRotate to the center in the radial direction with the middle part of the means as a fulcrum,Heat transferThe upper end of the means (cooling plate)Heat transferIt is desirable that the middle part of the means is pivoted outward in the radial direction with the fulcrum as a fulcrum, and is in contact with the inner surface of the protective tube.
[0019]
  With this configuration, when inserting the UV lamp into the protective tube,Heat transferUntil the means reaches the bottom of the protective tubeHeat transferSince the means does not contact the protective tube, insertion is easy, and when the insertion reaches the final stageHeat transferMake sure that the means is in close contact with the inner surface of the protective tube.Heat transferCan be performed efficiently.
[0020]
DETAILED DESCRIPTION OF THE INVENTION
Embodiments of the present invention will be described below with reference to the drawings.
(First embodiment)
The first embodiment shown in FIG. 1 is a water treatment apparatus that disinfects sewage treated water by ultraviolet irradiation. This water treatment apparatus has a flow path of treated water, a base 20 formed on the bottom surface of the flow path, a base plate 21 fixed to the upper surface of the base 20, and a lower end portion at the bottom of the flow path. It is configured to include three ultraviolet irradiation devices arranged in contact with each other and having an upper end portion on the water surface of the treated water, and a wiper device that cleans the water contact surface of the ultraviolet irradiation device.
[0021]
Each ultraviolet irradiation device includes a protective tube receiver 26 installed on the base plate 21, a quartz protective tube 1 supported at the lower end of the protective tube receiver 26 and having an axis line in the vertical direction, and a protective tube 1 includes a UV lamp 2 mounted in the interior. As shown in FIG. 1, the three ultraviolet irradiation devices are respectively arranged at the apexes of isosceles triangles whose bottoms are perpendicular to the flow direction of the treated water when viewed in a plan view.
[0022]
The protective tube receiver 26 is composed of a flat plate 26a fixed to the base plate 21 and a cylinder 26b fixed to the flat plate 26a with its axis orthogonal. The inner diameter of the cylinder 26 b is smaller than the outer diameter of the protective tube 1. The lower end of the protective tube 1 is closed by a hemispherical bottom, and this hemispherical bottom is supported in contact with the upper end of the cylinder 26b. Since the protective tube 1 is only supported in contact with the upper end of the cylinder 26b, the protective tube 1 is detached from the protective tube receiver 26 simply by pulling the protective tube 1 upward.
[0023]
In the wiper device, two wiper frame guide rods 22 erected on the base plate 21 with the axis line in the vertical direction and the upper ends of the two wiper frame guide rods 22 are connected and fixed to each other. The upper support plate 25, which is a horizontally arranged flat plate, and the two wiper frame guide rods 22 are arranged with the axis line in the vertical direction, and the lower end is supported by a foot bearing 24 fixed to the base plate 21. A wiper frame drive shaft 23 whose upper portion penetrates the upper support plate 25; a reduction motor 27 coupled to the upper end of the wiper frame drive shaft 23 to rotate the wiper frame drive shaft 23; and the upper support plate 25 The two wiper frame guide rods 2 are screwed into male threads formed on the outer surface of the wiper frame drive shaft 23. And said three protective tube 1 in mated wiper frame 28, the wiper frame 28 is configured to include a wiper 29 mounted on the portion which is fitted in the protective tube 1, a.
[0024]
The lower ends of the two wiper frame guide rods 22 are perpendicular to the base of the isosceles triangle, are on a straight line passing through the apex facing the base, and are outside the isosceles triangle at the base plate 21. The foot bearing 24 is positioned between the lower ends of the two wiper frame guide rods 22 and on the straight line.
[0025]
The protective tube 1 is inserted through an opening formed in the upper support plate 25, but is not fixed to the upper support plate 25, so that it can be easily pulled upward.
[0026]
The wiper frame 28 moves up and down along the wiper frame guide rod 22 as the wiper frame drive shaft 23 rotates, and the wiper 29 moves up and down while coming into contact with the outer peripheral surface of the protective tube 1 and adheres to the outer peripheral surface. Remove dust, scale, etc.) The wiper frame drive shaft 23 is rotatably supported by a bearing to which the upper support plate 25 is fixed, at a position penetrating the upper support plate 25.
[0027]
FIG. 3 shows an axial section of the protective tube 1 and the UV lamp 2. As described above, the protective tube 1 is a quartz cylinder having a lower end closed by a hemispherical bottom, and a flange 1a is attached to the upper end. The UV lamp 2 includes a U-shaped discharge tube 15, and FIG. 3 is a cross section of the discharge tube 15 on the surface where the U-shape is shown. In the present embodiment, the protective tube 1 has an inner diameter of 74 mm and an outer diameter of 80 mm. In this embodiment, the protective tube 1 is made of quartz, but a protective tube made of Teflon (registered trademark) can also be used. When using a protective tube made of Teflon (registered trademark), it is desirable to attach a reinforcing sleeve having a length of about 50 mm, for example, to the inner periphery of the upper end of the protective tube in order to prevent deformation.
[0028]
FIG. 4 shows an axial cross section of the UV lamp 2. FIG. 4 is a cross section of the UV lamp 2 shown in FIG. 3 taken along a plane parallel to the paper surface. In the installed state, the right side of the figure is down and the left side is up, so in the following description, the left side of the figure is described as the upper side, and the right side of the figure is described as the lower side. FIG. 6 is an enlarged view of the lower end portion of the UV lamp 2 of FIG.
[0029]
The illustrated UV lamp 2 has a U-shaped discharge tube 15, a pair of caps 30 coupled to the two upper ends of the discharge tube 15, and a lower end of the discharge tube 15 projecting downward and closed. A mercury reservoir 3 formed in a thin tubular shape, a cylindrical aluminum heat radiation block 4 fitted into the mercury reservoir 3 with one end closed, and a part 5 of the heat radiation block 4 formed on the side surface of the heat radiation block 4 A plurality of aluminum fins 5, an electric heater 6 coupled to the side surface of the cylindrical portion of the heat radiating block 4, a temperature sensor 16 mounted at another position on the side surface of the cylindrical portion of the heat radiating block 4, A coupled cooling fan 8; a pair of cooling plates 7 coupled to the fins 5 by screws; a flat lamp fixing plate 14 fixed in contact with the circumferential surfaces of both of the pair of caps 30; Bolts on the fixing plate 14 The combined lamp fixing boss 13, an opening formed in the lamp fixing boss 13 in the axial direction of the discharge tube 15, and the upper end portion of the lamp fixing boss 13 are positioned above the UV lamp flange 31. In addition, the heat dissipating block fixing tube / air blowing tube 11a inserted through the opening in the middle and having the lower end welded and fixed to one of the pair of cooling plates 7 is parallel to the heat dissipating block fixing tube / air blowing tube 11a. The heat dissipating block fixing tube 11b whose upper end is fixed to the lower surface of the UV lamp flange 31 and whose lower end is fixed to the other of the pair of cooling plates 7 is attached to the center of the upper surface of the UV lamp flange 31. The exhaust port 12, the electric wire supplying power to the connection terminal formed on the base 30, the electric wire supplying power to the cooling fan 8, and the output signal of the temperature sensor 16 are transmitted. It is configured to include a lamp cable 32 summarizes the line, the.
[0030]
The heat dissipating block 4 is made of aluminum including the fins 5 and has an axial length of 50 mm. However, the heat dissipating block 4 may be made of another metal, for example, copper, as long as the thermal conductivity is equal to or higher than that of aluminum. Both the lamp fixing boss 13 and the lamp fixing plate 14 are made of SUS, and the cooling plate 7 is made of spring steel (SUP).
[0031]
Although the discharge tube 15 is U-shaped, it may be W-shaped by combining two U-shapes. In the case of the W shape, a mercury reservoir is formed at the bottom of one of the two U shapes.
[0032]
A dry air blowing port 10 is formed at the upper end portion of the heat radiating block fixing tube / air blowing tube 11 a, and the lower end of the heat radiating block fixing tube / air blowing tube 11 a is opened at the lower end surface position of the heat radiating block 4. The lower end of the heat radiating block fixing tube 11b is also located at the lower end surface of the heat radiating block 4. The heat radiation block fixing tube / air blowing tube 11a and the heat radiation block fixing tube 11b are both made of SUS having a diameter of 6 mm.
[0033]
Each of the pair of caps 30 of the discharge tube 16 is provided with two connection terminals, and is connected to an electrode and a stabilizer disposed in the discharge tube. In the present embodiment, the mercury reservoir 3 has an outer diameter of 12 mm. The cylindrical heat dissipation block 4 has an inner diameter of 13 mm, and the mercury reservoir 3 having an outer diameter of 12 mm can be easily fitted therein.
[0034]
5 shows a cross section taken along the line AA in FIG. 3, and the left cross section shown in FIG. 4 is a cross section taken along the line BB in FIG. As shown in FIG. 5 and FIG. 6, the fins 5 are a total of five pieces: two pieces bent at right angles to an L shape, two pieces bent at an open L shape, and one piece of a flat plate shape. An upper end of an L-shaped vertical side is provided on the plane perpendicular to the axis of the heat dissipation block 4 so that the bent line is parallel to the axis of the cylindrical heat dissipation block 4 and the cylindrical heat dissipation block 4. Connected to the block 4. The two fins 5 bent in an L shape are arranged symmetrically with respect to the axis of the heat dissipation block 4, and the two fins bent in an L shape are also symmetrical with respect to the axis of the heat dissipation block 4. Is arranged. And the fin bent in the L shape and the fin bent in the open L shape are the fin bent in the L shape counterclockwise on the plane orthogonal to the axis of the heat dissipation block 4, and the open L shape. The fins are bent in this order, the fins are bent in an L shape, and the fins are bent in an open L shape. Further, the L-shaped lateral sides of the fin bent in an L shape and the fin positioned in the counterclockwise direction from the fin are arranged so as to be included in the same plane (vertical plane).
[0035]
The flat fins are arranged so as to be located in a plane perpendicular to the vertical sides of the fins bent in an L shape and including the axis of the heat dissipation block 4, and one side is the circumference of the heat dissipation block 4. Bonded to the face.
[0036]
The electric heater 6 is mounted on the outer peripheral surface of the heat dissipating block 4 at a position opposite to the position where the flat fins are coupled to the heat dissipating block 4 across the axis of the heat dissipating block 4, and the temperature sensor 16 is connected to the flat fins. It is arranged at a position for measuring the temperature of the outer peripheral surface of the heat dissipation block 4 in the vicinity of.
[0037]
The cooling plate 7 is a protective plate facing the flat plate portion with the two flat plate portions bolted to the side of the L-shape on the same plane and the UV lamp 2 mounted in the protective tube 1. A curved surface portion that abuts on the inner peripheral surface of the tube 1 and a curved surface portion that extends downward and has a distal end curved toward the center. The flat plate portion and the curved surface portion are formed on the axis of the heat dissipation block 4. They are connected by arcuate portions arranged in orthogonal planes.
[0038]
The arc-shaped portion is disposed at a substantially intermediate position in the vertical length of the heat dissipating block 4 and is coupled to the inner peripheral surface of the curved surface portion. The coupling position between the curved surface portion and the arcuate portion is point A (the actual coupling position is linear, but here refers to the coupling position in the sectional view). The outer diameter of the cooling plate 7 at point A is 73 mm, and is sized to be inserted into the protective tube 1 having an inner diameter of 74 mm.
[0039]
The heat radiating block fixing tube / air blowing tube 11a and the heat radiating block fixing tube 11b are inserted into an opening formed in the arc-shaped portion of the cooling plate 7 and fixed by welding.
[0040]
As shown in FIG. 5, when the cross section of the protective tube 1 is divided into approximately four equal parts, the cooling plate 7 is located in two sectors facing each other with the apex in contact with each other. Is not arranged.
[0041]
The cooling fan 8 is located in a downward extension region of a prism portion sandwiched between two flat plate portions of the cooling plate 7, has a cross section that is the same shape as the cross section of the prism, and is fixed to the heat dissipation block 4. ing.
[0042]
  The UV lamp 2 configured as described above is inserted into the protective tube 1, and the UV flange 31 is airtightly coupled to the flange 1 a of the protective tube 1. When the UV lamp 2 is inserted into the protective tube 1, when the lower end of the UV lamp 2 approaches the bottom of the protective tube 1, the lower end of the curved portion of the cooling plate 7 (point D in FIG. 4) is the hemisphere at the bottom of the protective tube 1. Abuts against the inner surface of the shaped portion. When the UV lamp 2 is inserted deeper into the protective tube 1, the point D of the cooling plate 7 in contact with the hemispherical portion at the bottom of the protective tube 1 moves along the inner surface of the hemispherical portion of the protective tube 1. , Rotate around the point A. By this rotation, the curved surface portion of the cooling plate 7 above the point A moves outward in the radial direction and comes into contact with the inner peripheral surface of the protective tube 1. In this case, the point C in FIG. 4 first comes into contact with the inner peripheral surface of the protective tube 1, and comes into contact with the inner peripheral surface of the protective tube 1 up to the curved portion below the point C as the cooling plate 7 rotates. That is, the lower end portion of the curved surface portion of the cooling plate 7 is in contact with the inner peripheral surface of the hemispherical portion of the protective tube 1, and the upper end portion is in contact with the inner peripheral surface of the straight tube portion of the protective tube 1.BetweenCold plate 7Is provided in contact.
[0043]
When the UV lamp 2 is turned on, the electric heater 6 is first energized. When the detected temperature of the temperature sensor 16 reaches a set temperature, for example, 45 ° C., discharge starts, and droplet-shaped mercury accumulates at the bottom of the mercury reservoir 3. That is, the coldest spot of the lamp is in the mercury reservoir 3 and the mercury vapor pressure in the discharge tube 15 (the UV generation efficiency is 4 to 6 × 10 6 in mercury vapor pressure).^-6(maximum in mmHg) is determined by the temperature of the mercury reservoir 3. The temperature of the mercury reservoir 3 that maximizes the UV generation efficiency is in the range of 40 to 45 ° C.
[0044]
The heat of the mercury reservoir 3 is transmitted in the order of the mercury reservoir 3 → the cylindrical portion of the heat radiation block 4 → the fin 5 → the cooling plate 7 → the protective tube wall, and is radiated from the protective tube wall to the treated water. By filling a heat conductive paste between the heat radiation block 4 and the mercury reservoir 3, heat transfer from the mercury reservoir 3 to the heat radiation block 4 can be improved. Moreover, if a heat conductive sheet is inserted | pinched between the fin 5 and the cooling plate 7, heat conductive efficiency will improve, and if a heat conductive sheet is stuck on the contact surface with the protective tube inner surface of the cooling plate 7, heat conductive efficiency will improve. . As the heat conductive sheet, a sheet obtained by solidifying aluminum powder with silicon can be used. Similarly, the heat conductive paste is a paste obtained by mixing silicon and aluminum powder.
[0045]
Further, since treated water is present outside the protective tube 1, the air inside the protective tube 1 is cooled by the treated water through the tube wall of the protective tube 1. The cooled air descends along the tube wall of the protective tube 1, reaches the bottom of the protective tube 1, and then is sucked and driven by the cooling fan 8 to rise between the fins 5. The air driven by the cooling fan 8 takes in the heat of the fins 5, cools the heat dissipation block 4, and then rises until it hits the base 30 or the UV flange 31. The air hitting the base 30 or the UV flange 31 is reversed and descends along the inner peripheral surface of the protective tube 1 and is cooled again by the treated water.
[0046]
A dry air blowing port 10 is provided at an upper end portion of the heat radiation block fixing tube / air blowing tube 11a, and is connected to an external dry air source. The dry air blown into the protective tube 1 from the dry air blowing port 10 is sucked into the cooling fan 8 together with the air cooled with the treated water through the tube wall of the protective tube 1 and sent upward. The dry air that flows upward prevents moisture on the inner surface of the protective tube by taking in moisture in the protective tube 1.
[0047]
A part of the air that is driven by the cooling fan 8 and flows upwards descends again along the inner peripheral surface of the protective tube 1, and a part (an amount equal to the amount supplied from the dry air blowing port 10) It is exhausted to the outside together with moisture taken in from the exhaust port 12 of the UV flange 31.
[0048]
Since air is circulated in the protective tube 1 by the cooling fan 8, the heat of the mercury reservoir 3 is transmitted in the order of the mercury reservoir 3 → the heat radiation block 4 → the fin 5 → the rising air, and the heat of the air is In the middle of descending along the inner surface of the tube wall, it is transmitted to the treated water via the tube wall of the protective tube 1.
[0049]
The temperature of the mercury reservoir 3 is detected by a temperature sensor 16 attached to the heat dissipation block 4, and the energization to the electric heater 6 that is a heating means is turned on / off according to the detected temperature, thereby setting a preset target temperature. To be controlled. Instead of turning on / off the energization of the electric heater 6, the cooling fan 8 may be turned on / off to control the target temperature.
[0050]
  According to the present embodiment, the heat radiation block 4 including the electric heater 6 and the fin 5 is provided so as to surround the mercury reservoir 3, and the fin 5 and the protective tube 1 are provided.Heat transfer betweenCooling plate 7 as a meansProvided in contact withTherefore, the heat of the mercury reservoir 3 is efficiently transmitted to the treated water, and the capacity of the cooling fan 8 can be reduced.
[0051]
Since the lower end of the protective tube 1 is closed, it is not necessary to prepare a separate air flow path for introducing air into the protective tube 1 from below when installing the ultraviolet irradiation device in the treated water. Is easy. Further, since the fins 3 are provided in the heat dissipation block 4, heat is efficiently transferred from the heat dissipation block 4 to the air, and the capacity of the cooling fan 8 can be reduced.
(Second Embodiment)
In the first embodiment, the cooling fan 8 is provided below the cooling plate 7 so that the cooling plate 7 can be air-cooled in addition to the heat radiation to the protective tube by the cooling plate 7. However, the cooling plate 7 is not always necessary. In the second embodiment of the present invention, heat radiation of the mercury reservoir 3 is performed by the cooling fan 8 via the heat radiation block 4 and the fins 5 without the cooling plate 7. Since other configurations are the same as those of the first embodiment, description thereof is omitted.
[0052]
Also in the present embodiment, treated water is present outside the protective tube 1, and the air inside the protective tube 1 is cooled by the treated water through the tube wall of the protective tube 1. The cooled air descends along the tube wall of the protective tube 1, reaches the bottom of the protective tube 1, and then is driven by the cooling fan 8 to rise between the fins 5. The air driven by the cooling fan 8 takes in the heat of the fins 5, cools the heat dissipation block 4, and then rises until it hits the base 30 or the UV flange 31. The air hitting the base 30 or the UV flange 31 is reversed and descends along the inner peripheral surface of the protective tube 1 and is cooled again by the treated water. The temperature of the mercury reservoir 3 is controlled to a preset target temperature by detecting the temperature with a temperature sensor 16 attached to the heat dissipation block 4 and turning on and off the electric heater 6 in accordance with the detected temperature. . Instead of turning on / off the energization of the electric heater 6, the cooling fan 8 may be turned on / off to control the target temperature.
[0053]
According to the present embodiment, the heat radiation block 4 including the electric heater 6 and the fins 5 is provided so as to surround the mercury reservoir 3, and air is circulated in the protective tube 1 by the cooling fan 8. Is transmitted in the order of mercury reservoir 3 → radiation block 4 → fin 5 → rising air, and the heat of the air is treated water through the tube wall of the protective tube 1 while the air descends along the inner surface of the tube wall. Is transmitted to. Then, the temperature of the mercury reservoir 3 is controlled to the target temperature by turning on / off the power supply to the electric heater 6 or by turning on / off the cooling fan 8. Since the lower end of the protective tube 1 is closed, it is not necessary to prepare a separate air flow path for introducing air into the protective tube 1 from below when installing the ultraviolet irradiation device in the treated water. Is easy. Further, since the fins 3 are provided in the heat dissipation block 4, heat is efficiently transferred from the heat dissipation block 4 to the air, and the capacity of the cooling fan 8 can be reduced.
(Third embodiment)
The third embodiment of the present invention differs from the first embodiment in that the cooling fan 8 is not provided. Since other configurations are the same as those of the first embodiment, description thereof is omitted. In the present embodiment, the temperature of the mercury reservoir 3 is set in advance by detecting the temperature with a temperature sensor 16 attached to the heat dissipation block 4 and turning on / off the electric heater 6 according to the detected temperature. The target temperature is controlled.
[0054]
According to the present embodiment, the cooling plate 7 that is in close contact with the inner wall surface of the protective tube 1 is provided, and heat is efficiently transferred from the heat radiation block 4 to the treated water. The temperature of the mercury reservoir 3 can be controlled to the target temperature. In addition, since the lower end of the protective tube 1 is closed, it is not necessary to prepare a separate air flow path for introducing air from below into the protective tube 1 when installing the ultraviolet irradiation device in the treated water. Is easy.
[0055]
【The invention's effect】
  According to the present invention,It is possible to provide an ultraviolet irradiation device capable of effectively cooling the mercury reservoir even with a protective tube having a closed bottom.
[Brief description of the drawings]
FIG. 1 is a cross-sectional view showing an overall configuration of an ultraviolet irradiation apparatus according to a first embodiment of the present invention.
2 is an enlarged cross-sectional view of a lower part of the ultraviolet irradiation apparatus shown in FIG.
3 is a longitudinal sectional view showing a protective tube and a UV lamp of the ultraviolet irradiation device shown in FIG. 1. FIG.
4 is a longitudinal sectional view showing a UV lamp of the ultraviolet irradiation device shown in FIG. 1. FIG.
5 is a cross-sectional view taken along line AA in FIG. 3;
6 is an enlarged sectional view showing a lower end portion of the UV lamp shown in FIG.
FIG. 7 is a cross-sectional view showing an example of the prior art.
[Explanation of symbols]
1 protection tube
1a Flange
2 UV lamp
3 Mercury reservoir
4 Heat dissipation block
5 Fin
6 Electric heater
7 Cooling plate
8 Cooling fan
9 Heat conduction sheet
10 Dry air inlet
11a Heat-dissipating block fixed tube / air blowing tube
11b Heat radiation block fixed tube
12 Exhaust port
13 Lamp fixing boss
14 Lamp fixing plate
15 discharge tube
16 Temperature sensor
20 foundation stand
21 base plate
22 Wiper frame guide rod
23 Wiper frame drive shaft
24 Foot bearing
25 Upper support plate
26 Protection tube receiver
26a flat plate
26b cylinder
27 Reduction motor
28 Wiper frame
29 Wiper
30 base
31 UV lamp flange
32 Lamp cable

Claims (6)

A UV lamp comprising a discharge tube filled with mercury vapor is placed in a protective tube with a closed bottom, and the protective tube with the UV lamp is immersed in the processing solution to irradiate the processing solution with ultraviolet light. a irradiation apparatus, the mercury reservoir formed in the discharge tube, and the heat dissipation block heat mercury reservoir is disposed around the mercury reservoir comprises heating means are heat transfer, the protective tube and the heat sink block And a heat transfer means provided in contact with the ultraviolet irradiation device. 2. The ultraviolet irradiation device according to claim 1, wherein the heat dissipating block includes heat dissipating fins, and the heat transfer means is fixed on one surface to the fins of the heat dissipating block, and the other surface on the inner surface of the protective tube. An ultraviolet irradiation device comprising a metal cooling plate brought into contact therewith. A UV lamp comprising a discharge tube filled with mercury vapor is placed in a protective tube with a closed bottom, and the protective tube with the UV lamp is immersed in the processing solution to irradiate the processing solution with ultraviolet light. a radiation apparatus, mercury reservoir formed in the discharge tube, and the heat dissipation block heat mercury reservoir is disposed around the mercury reservoir comprises heating means are heat transfer, disposed below the heat sink block And a cooling fan that blows cooling air upward.   The ultraviolet irradiation device according to claim 3, wherein the heat radiation block includes a fin having a heat radiation surface in the vertical direction. A UV lamp comprising a discharge tube filled with mercury vapor is placed in a protective tube with a closed bottom, and the protective tube with the UV lamp is immersed in the processing solution to irradiate the processing solution with ultraviolet light. a radiation apparatus, mercury reservoir formed in the discharge tube, and the heat dissipation block heat mercury reservoir is disposed around the mercury reservoir comprises heating means are heat transfer, disposed below the heat sink block An ultraviolet irradiation device comprising: a cooling fan that blows cooling air upward; and heat transfer means provided in contact with the heat dissipation block and the protective tube. 6. The ultraviolet irradiation device according to claim 5, wherein the heat radiating block includes a heat radiating fin, and the heat transfer means is fixed on one surface to the fin of the heat radiating block, and the other surface on the inner surface of the protective tube. An ultraviolet irradiation device comprising a metal cooling plate brought into contact therewith.

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