JP2007299563A - High power sterilizer lamp - Google Patents

Abstract

<P>PROBLEM TO BE SOLVED: To provide a high power sterilizer lamp capable of reducing temperature difference between amalgam and the coldest part and preventing appropriately the deterioration of ultraviolet illuminance even when used under a low-temperature condition. <P>SOLUTION: The sterilizer lamp is constituted of a quartz bulb 12 which transmits effectively ultraviolet rays of 300 nm or less and electrodes 14a, 14b arranged at its both ends. An indium ring 16, mercury, and rare gas which are amalgamated by reacting with mercury are filled into the quartz bulb 12, and one of the electrodes 14a is supported by a stem mount 13. The indium ring 16 is arranged in the vicinity of the stem mount 13 and at the position outside of the electrode 14a, and the indium ring 16 is supported by projection parts 17, 17 formed in the quartz bulb 12. <P>COPYRIGHT: (C)2008,JPO&INPIT

Description

  The present invention relates to a sterilization lamp used for water sterilization treatment, and more particularly to a high-power sterilization lamp in which a rare gas and mercury or amalgam are enclosed in a tube and emits ultraviolet rays by discharging between electrodes.

  Conventionally, a mercury lamp (low pressure mercury vapor discharge lamp) in which a rare gas (inert gas) and mercury are enclosed in a tube has been used as an ultraviolet sterilization lamp used for water sterilization treatment or the like. This type of germicidal lamp discharges between the electrodes arranged at both ends of the tube, so that the mercury atoms enclosed are excited to a high energy level, and ultraviolet radiation is generated when returning to the ground state from there. It has become.

For water sterilization treatment, it is common to irradiate ultraviolet rays of 254 nm with a sterilization lamp. The radiation efficiency of ultraviolet rays depends on the pressure of mercury vapor sealed in the tube, and the pressure of mercury vapor in the tube is determined by the temperature of the coldest part of the tube (“the coldest part of the tube Approach the value of mercury vapor pressure at the temperature of). In the case of radiating ultraviolet rays of 254 nm, the pressure of mercury vapor for obtaining the highest radiation efficiency is about 0.8 Pa (6 × 10 ⁻³ torr), and the temperature condition for realizing this is 40 ° C. That is, when the temperature of the coldest part of the tube is 40 ° C., the pressure of mercury vapor in the tube is about 0.8 Pa, and the ultraviolet radiation efficiency is highest when in this state.

  However, for example, when a lamp current of 0.6 A or more is passed through a lamp having a tube diameter of 20 mm or less, the temperature of the coldest part during lamp operation greatly exceeds 40 ° C. In this case, the pressure of mercury vapor in the pipe is out of the optimum value, and the ultraviolet illuminance is lowered. Therefore, as a solution to such a problem, a method using amalgam (an alloy of mercury and other metals) is widely adopted. For example, a method of amalgamating enclosed mercury in a tube and a method of encapsulating amalgam in a tube instead of enclosing pure mercury are known.

  In lamps employing these methods (amalgam lamps), it is possible to suitably suppress an increase in the pressure of mercury vapor accompanying a rise in temperature, and it is possible to stabilize the pressure of mercury vapor over a wide temperature range. As a result, high ultraviolet radiation efficiency can be obtained even at high temperatures.

  FIG. 6 shows a configuration of an amalgam lamp 61 in which a ring (or ribbon) of a metal (for example, indium or the like) that easily amalgamates by reacting with mercury is enclosed in a tube together with mercury, and mercury is amalgamated in the tube. It is a figure which shows an example. As shown in the figure, in this amalgam lamp 61, a pair of mount portions 68, 68 are disposed at both ends of the quartz bulb 62.

  FIG. 7 is an enlarged view of one mount portion 68 (the right mount portion 68 in FIG. 6). In this mount portion 68, the coil 70 is stretched between lead wires 69 a and 69 b erected at a predetermined interval from the tip of the stem mount 63, and blackening of the coil 70 is prevented on the outer periphery thereof. A nickel ring 65 is attached. Further, in the vicinity of the stem mount 63 (outside the electrode 64), a ring 66 of indium (a metal that easily amalgamates by reacting with mercury) is disposed. Mercury and a rare gas are enclosed in the tube of the quartz bulb 62, and the indium in the ring 66 reacts with the mercury to be amalgamated.

  If the indium ring 66 moves to a region inside the electrode 64 for some reason, the temperature rises due to the heat of discharge, which may cause a decrease in UV illuminance. It is necessary to fix the electrode 64 at a position outside the electrode 64. Therefore, in the example of FIGS. 6 and 7, the ring 66 is joined to a support line 67 having one end connected to the lead wire 69 c, and is thereby held and fixed at a desired position. .

  In this amalgam lamp 61, the dimension from the outer end of the indium ring 66 to the coil 70 is set to 45 mm in consideration of the influence of heat from the electrode 64. When the amalgam lamp 61 is turned on, the indium ring 66 gradually increases in temperature due to heat of discharge, heat from the electrode 64, etc., and the ultraviolet illuminance gradually increases to become a stable ultraviolet illuminance. If the dimension from the outer end portion of 66 to the coil 70 is larger than 45 mm, it takes time until the indium ring 66 reaches a sufficient temperature after lighting (that is, until the ultraviolet illuminance is stabilized). If it is smaller than 45 mm, the influence of heat is too great, the temperature of the indium ring 66 becomes higher than necessary, the pressure of mercury vapor deviates from the optimum value, and the ultraviolet illuminance falls on the contrary.

  In this type of amalgam lamp 61, the dimension from the outer end of the indium ring 66 to the end of the quartz bulb 62 is generally set to about 15 mm.

  FIG. 8 is a diagram showing a configuration example of an amalgam lamp 71 in which amalgam is sealed in a lamp tube. As shown in the figure, the amalgam lamp 71 includes a stem mount 73, an electrode 74 (lead wires 79 and 79 erected at a predetermined interval at the tip of the stem mount 73, and a coil 80. However, one set is arranged at each end of the quartz bulb 72.

In the center of the quartz bulb 72, an amalgam 75 is arranged. The amalgam 75 is an alloy of indium (or a metal such as bismuth, lead, tin) and mercury, and is fused to the inner peripheral surface of the quartz bulb 72. In this type of amalgam lamp 71, generally, the height of the stem mount 73 (the dimension from the end of the quartz bulb 72 to the coil 80) is designed to be about 35 mm.
JP 2000-357491 A

  For example, when the amalgam lamp 61 of FIG. 6 is continuously lit under the conditions of a lamp current of 0.8 A and a lamp power of 65 W, mercury vapor moves to the end of the tube, and the ultraviolet characteristics as an amalgam lamp (the ultraviolet illuminance with respect to the temperature change). (The fluctuation rate is small) is gradually lost, and it becomes close to the ultraviolet characteristics of the mercury lamp not using amalgam (the fluctuation rate of the ultraviolet illuminance with respect to the temperature change is large), and the ultraviolet illuminance tends to decrease.

  Hereinafter, this point will be specifically described. When the amalgam lamp 61 of FIG. 6 is turned on, normally, the temperature of the indium ring 66 gradually rises due to the heat of discharge, the heat from the electrode 64, etc., so that the ultraviolet illuminance gradually rises and eventually stabilizes. It is configured. Here, when the difference between the temperature of the coldest part (the tube wall at the tube end (outside the indium ring 66)) and the temperature of the heated indium ring 66 is not so large, mercury vapor in the tube The pressure of the amalgam is controlled by the amalgam and becomes the “value of the mercury vapor pressure of the amalgam” at the temperature of the tube wall, and there is no particular problem.

  However, for example, when the amalgam lamp 61 is set in a water treatment apparatus and continuously used under a low temperature condition of 20 ° C. or lower, the tube wall is forcibly cooled by the flowing low temperature treated water. Therefore, the difference between the temperature of the tube wall at the end of the tube and the temperature of the indium ring 66 may be greatly increased. In this case, the pressure of mercury vapor at the end of the tube is significantly lower than the pressure of mercury vapor around the indium ring 66. As a result, the mercury vapor in the tube moves to the end of the tube and condenses. There is a problem that liquid-phase mercury adheres to the tube wall at the end of the tube.

  Further, when the amalgam lamp 61 shown in FIG. 6 is turned on in a vertical state, mercury vapor is pushed up by convection, and mercury may adhere to the tube end portion above the lamp.

  The pressure of mercury vapor around the indium ring 66 should be close to the “value of the mercury vapor pressure of amalgam” at the temperature of the tube wall at the end of the tube, but liquid pure mercury is present at the end of the tube. The mercury vapor pressure around the mercury is close to the "pure mercury vapor pressure value" at the tube wall temperature at the tube end. Therefore, as the amount of mercury adhering to the tube end increases, the ultraviolet characteristics of the lamp become closer to the “ultraviolet characteristics of a mercury lamp that does not use amalgam (the variation rate of ultraviolet illuminance with respect to temperature changes is large)”. Therefore, it becomes difficult to satisfy the pressure range of mercury vapor for obtaining high radiation efficiency and the temperature condition for realizing this, resulting in a decrease in ultraviolet illuminance.

  Also, in the amalgam lamp 71 of FIG. 8, when continuously lit under a low temperature condition of 20 ° C. or less, the temperature difference between the coldest part (tube wall at the end of the tube) and the amalgam 75 increases, There is a pressure difference between the mercury vapor and the mercury vapor in the coldest part, the mercury vapor in the tube moves to the coldest part, and mercury (liquid phase) adheres to the tube wall of the coldest part In this case as well, there is a problem that the illuminance of ultraviolet rays decreases.

  Further, as described above, the amalgam 75 in the amalgam lamp 71 shown in FIG. 8 is fixed to the inner peripheral surface of the quartz bulb 72 by “fusion”, so that the lamp 71 is kept upright for a long time. When the lamp is turned on, the adhesive strength of the amalgam 75 is reduced by heat, and the amalgam 75 may be peeled off from the inner peripheral surface of the quartz bulb 72. And if the state where the amalgam 75 that has peeled off is in contact with the electrode 74 or remains in the position in the vicinity of the electrode 74 continues, the temperature of the amalgam 75 rises above the limit, and the tube in the coldest part There is a problem that the temperature difference between the wall and the amalgam 75 increases, and as a result, the ultraviolet illuminance decreases for the same reason as described above.

  The present invention was made to solve such problems in the prior art, and even when used under low temperature conditions, the temperature difference between the amalgam and the coldest part can be reduced, It aims at providing the high output germicidal lamp which can prevent the fall of ultraviolet illuminance and can also avoid the problem of omission of amalgam suitably.

  The sterilizing lamp according to claim 1 is configured by a bulb that effectively transmits ultraviolet rays of 300 nm or less and electrodes disposed at both ends thereof, and amalgam and rare gas (or mercury and A sterilizing lamp in which a metal, mercury, and a rare gas that reacts to amalgamate are sealed, and is configured so that at least one of the electrodes is supported by the stem mount, and is in the vicinity of the stem mount. A metal that reacts with amalgam or mercury to form amalgam is disposed outside the electrode supported by the stem mount, and reacts with amalgam or mercury by a plurality of convex portions formed on the bulb. Thus, the metal that amalgamates is retained.

  In addition, it is preferable that the distance from the outer end portion of the metal that amalgamates by reacting with amalgam or mercury to the tube end portion is set to be 10 mm or less, and the coil of the electrode supported by the stem mount The distance from the outer end of the metal that amalgamates to amalgam by reacting with amalgam or mercury is preferably set to 25 to 40 mm. In addition, one of the electrodes is not supported by the stem mount, is constituted only by a lead wire and a coil, and is dimensioned so that the distance from the coil of the electrode to the inner end of the bulb is 25 mm or less. Is preferred.

  The germicidal lamp according to claim 5 is constituted by a bulb that effectively transmits ultraviolet rays of 300 nm or less and electrodes disposed at both ends thereof, and amalgam and rare gas are enclosed in a tube of the bulb, Or a sterilizing lamp that encloses a metal that amalgamates by reacting with mercury, mercury, and a rare gas, wherein the metal that amalgamates by reacting with amalgam or mercury is formed in a ring shape, or The metal that reacts with amalgam or mercury to become amalgam is fixed to the inner peripheral surface of the metal ring holder, and is arranged in the middle part of the quartz bulb, and by a plurality of convex portions formed on the bulb, A metal gum or ring-shaped holder that is amalgamated by reacting with amalgam or mercury is held.

  In this case, it is preferable that the distance from the coil of the electrode to the tube end of the valve is set to be 25 mm or less.

  In the sterilizing lamp according to claim 1, since the metal that amalgamates by reacting with amalgam or mercury is held by the projections 17 formed on the bulb, a column for holding them. There is no need to arrange the wire, and as a result, the problem of “high temperature of amalgam or the like due to heat conduction through the support wire” can be preferably avoided. In addition, by optimizing the dimensions from the outer end of the amalgam etc. to the coil of the electrode, and the dimensions from the end of the bulb, etc., even when used under low temperature conditions, suppressing temperature rise of the amalgam etc. The temperature difference from the coldest part can be reduced, and the problem of mercury vapor movement in the tube and the adhesion of mercury to the tube wall at the tube end can be avoided. As a result, it is possible to suitably prevent a decrease in ultraviolet illuminance.

  The sterilizing lamp according to claim 5 has a structure in which amalgam or the like is formed in a ring shape, or amalgam or the like is fixed to a holder and is held by a convex portion formed in a bulb. And the problem that an amalgam peels off from the internal peripheral surface of a bulb | bulb like the conventional amalgam lamp can be avoided suitably. In addition, since the height of the stem mount is optimized, the phenomenon that mercury adheres to the end of the tube can be avoided, and a decrease in ultraviolet illuminance can be prevented.

  Hereinafter, the best mode for carrying out the “high output sterilization lamp” of the present invention will be described. FIG. 1 is a configuration diagram of an amalgam lamp 11 according to the first embodiment of the present invention. This amalgam lamp 11 is a type of lamp that uses a lamp current of 0.6 A or more. The amalgam lamp 11 is a quartz bulb 12 that effectively transmits ultraviolet light of 300 nm or less, and electrodes 14 (14a, 14b) arranged one at each end. ) And. As shown in the figure, one of the two electrodes 14a and 14b (the right electrode 14a in the figure) is held by the stem mount 13, while the other (the left electrode 14b in the figure) is The lead wire 19 and the coil 20b alone are used.

  Further, as shown in the figure, a nickel ring 15 for preventing the blackening of the coil 20a is attached to the outer periphery of the electrode 14a on the stem mount 13 side. In the vicinity of the stem mount 13, an indium ring 16 that is amalgamated by reacting with mercury is disposed. Mercury and a rare gas are sealed in the tube of the quartz bulb 12, and the indium in the ring 16 reacts with the mercury to be amalgamated.

  As described above, the conventional amalgam lamp 61 (see FIGS. 6 and 7) has a significant temperature difference between the indium ring 66 and the tube wall at the tube end when used under a low temperature condition of 20 ° C. or less. As a result, there is a problem that mercury adheres to the tube wall at the end of the tube and the illuminance of ultraviolet rays decreases, and as a result of the inventors of the present invention studying this problem, The matter was found to be the main factor.

  In the amalgam lamp 61 of FIG. 6, since the indium ring 66 is connected and held to the lead wire 69c via the support wire 67, the thermal conductivity from the electrode 64 is high, and the temperature of the indium ring 66 is higher than necessary. It means that the gap between the outer end of the indium ring 66 and the end of the quartz bulb 62 (generally about 15 mm) is too wide, and a temperature difference is likely to occur and is difficult to eliminate. It is.

  In the amalgam lamp 11 of the present embodiment, the indium ring 16 is sandwiched between convex portions 17 and 17 (projections protruding from the inner peripheral surface toward the central axis of the tube) formed on the quartz bulb 12. Thus, the movement of the indium ring 16 in the longitudinal direction of the tube is restricted and held at a predetermined position. Therefore, in the amalgam lamp 11 of the present embodiment, there is no need to arrange a support line for holding the indium ring 16, and as a result, there is a problem of "high temperature of the indium ring 16 by heat conduction through the support line". Can be suitably avoided.

  The convex portions 17, 17 partially heat and soften the quartz bulb 12, and partially push the part of the wall surface of the quartz bulb 12 from the outer peripheral surface side toward the central axis of the tube. Form by being.

  By the way, in the conventional amalgam lamp 61 of FIG. 6, the dimension from the outer end of the indium ring 66 to the coil 70 is set to 45 mm. This dimension setting is “heat conduction through the support wire 67”. Therefore, there is a problem in applying this dimensional setting as it is to a structure in which the support line is omitted as in the amalgam lamp 11 of the present embodiment. Therefore, the inventors of the present invention have studied the appropriate range of the dimension (the dimension from the outer end of the indium ring 16 to the coil 20a) in the amalgam lamp 11 having the structure shown in FIG.

  As a result, when this dimension exceeds 40 mm, it turns out that it takes too much time (it takes 30 minutes or more) for the UV illuminance to stabilize after the start of lighting of the amalgam lamp 11, and when it is less than 25 mm It has been found that although the time until the UV illuminance reaches the peak after the start of lighting is short, the UV illuminance decreases after the peak. For this reason, in this embodiment, the dimension is set to 30 mm. However, the dimension setting may be changed within a range of 25 to 40 mm.

  Furthermore, in the present embodiment, the dimension from the outer end of the indium ring 16 to the end of the quartz bulb 12 is set to 10 mm. It is known that when this dimension exceeds 10 mm, a temperature difference is likely to occur between the tube end portion and the indium ring 16 and is difficult to be eliminated, and if it is 10 mm or less, the temperature difference can be reduced. This has been confirmed by experiments by the inventors.

  On the other hand, the dimension from the coil 20b on which the stem mount is not arranged to the inner end 18 of the quartz bulb 12 is set to 20 mm. When this dimension exceeds 25 mm, it is known that mercury tends to adhere to the end portion 18 at the time of lighting, and the UV illuminance after stabilization is lowered. In the present embodiment, as described above. Although it is set to 20 mm, the dimension setting may be changed as long as it is 25 mm or less.

  Thus, in the amalgam lamp 11 of the present embodiment, the indium ring 16 is not connected to the lead wire 19 and is held by the convex portions 17 and 17 formed on the quartz bulb 12. And the dimension from the outer end of the indium ring 16 to the coil 20a is set within the range of 25 to 40 mm, and the dimension from the outer end of the indium ring 16 to the end of the quartz bulb 12 Is set to 10 mm or less, and further, the dimension from the coil 20b on which the stem mount is not disposed to the inner end 18 of the quartz bulb 12 is set to 25 mm or less. Even when used under low temperature conditions, the temperature difference from the coldest part can be reduced, and the transfer of mercury vapor in the tube. It can be suitably avoid the problem of adhesion of mercury in the tube wall of the tube end.

  The quartz bulb 12 has a tube diameter of 18 mm, a tube length of 1005 mm, and a wall thickness of 0.9 mm. The height of the stem mount 13 (the dimension from the end of the quartz bulb 12 to the coil 20a of the electrode 14) is It is set to 40 mm.

  In this embodiment, mercury and a rare gas are enclosed in the tube of the quartz bulb 12, and the indium and mercury in the ring 16 react to form amalgam. However, the amalgam is sealed from the beginning. Also good. In this embodiment, the nickel ring 15 for preventing the blackening of the coil is disposed on the outer periphery of the coil 20a on the stem mount 13 side. However, the nickel ring 15 can be omitted. Further, a nickel ring may be disposed on the outer periphery of the coil 20b on which the stem mount is not disposed.

  FIG. 2 is a configuration diagram of a high-power sterilizing lamp (amalgam lamp 21) according to the second embodiment of the present invention. This amalgam lamp 21 is also a type of lamp that uses a lamp current of 0.6 A or more, and includes a quartz bulb 22 that effectively transmits ultraviolet rays of 300 nm or less, and electrodes 24 and 24 that are arranged at both ends thereof. It is configured. The electrodes 24 and 24 are supported by stem mounts 23 and 23, respectively.

  The quartz bulb 22 has a tube diameter of 18 mm, a tube length of 1005 mm, and a wall thickness of 0.9 mm. The height of the stem mount 23 (the dimension from the end of the quartz bulb 22 to the coil 30 of the electrode 24) is either left or right. Is also set to 25 mm (25 mm or less).

  In the tube of the amalgam lamp 21, an amalgam 25 and a rare gas are enclosed. The amalgam 25 is not bonded to the inner peripheral surface of the quartz bulb 22, but is fixed via a metal holder 26 as shown in FIG. More specifically, the holder 26 has a ring shape (cylindrical shape) having an outer diameter slightly smaller than the inner diameter of the quartz bulb 22 (about 16 mm) and a width of about 8 mm in the axial direction. As shown in FIG. 3, the entire peripheral surface is mesh-shaped. And the amalgam 25 is crimped | bonded with respect to the internal peripheral surface of this ring-shaped holder 26, and the holder 26 is arrange | positioned in the pipe | tube of the quartz bulb 22 in the state which hold | maintained the amalgam 25 inside.

  Further, the quartz bulb 22 has convex portions 27 and 27 (protrusions protruding from the inner peripheral surface toward the axis of the tube) on both sides of the position where the holder 26 is disposed. The movement of the holder 26 in the longitudinal direction of the tube is restricted and held at a predetermined position.

  The convex portions 27, 27 partially heat and soften the quartz bulb 22, partially push a part of the wall surface of the quartz bulb 22 from the outer peripheral surface side toward the central axis of the tube, and Form by being.

  In the present embodiment, the amalgam 25 is sealed in the tube while being fixed to the holder 26, but a metal such as indium or lead (a metal that is easily amalgamated by reacting with mercury or an alloy thereof). May be fixed to the holder 26, or such a metal may be formed in a ring shape and enclosed in a tube together with mercury. Further, the amalgam 25 and the holder 26 may enclose only one set or a plurality of sets for one amalgam lamp 21.

  The amalgam lamp 21 has such a structure as described above. However, the amalgam lamp 21 can avoid the problem of dropping off the amalgam 25 and can also avoid the problem of lowering the ultraviolet illuminance. Specifically, since the amalgam 25 is pressure-bonded to the mesh-shaped holder 26 and the holder 26 is held by the convex portions 27 and 27 of the quartz bulb 22, the movement in the longitudinal direction of the tube is restricted and predetermined Can be fixed in the position.

  Further, since the height of the stem mount 23 (the dimension from the end of the quartz bulb 22 to the coil 30 of the electrode 24) is set to 25 mm on both the left and right sides, the phenomenon that mercury adheres to the end of the tube is suitable. Therefore, it is possible to prevent a decrease in UV illuminance.

  This point will be described in detail. A conventional amalgam lamp in which an amalgam 75 (or a metal that is easily amalgamated) is disposed in an intermediate portion (region between two electrodes 74, 74) of a quartz bulb 72 (see FIG. 8). In 71, the height of the stem mount 73 was set to about 35 mm. However, if this dimension exceeds 25 mm, the temperature at the end of the tube and the amalgam 75 when used under low temperature conditions. The temperature difference may become larger than the limit, and if it is lit continuously, mercury will adhere to the end of the tube and the UV illuminance will decrease. As a result of research, it has been found that if this dimension is set to 25 mm or less, the temperature difference between the tube end portion and the amalgam 75 can be reduced, and a decrease in ultraviolet illuminance can be prevented.

  Therefore, in the present embodiment, the height of the stem mount 23 (the dimension from the end of the quartz bulb 22 to the coil 30 of the electrode 24) is set to 25 mm on both the left and right sides. However, it is not necessary to limit to “25 mm”, and an arbitrary dimension of 25 mm or less may be set.

  Next, examples of the present invention will be described. First, as Example 1 of the present invention, the amalgam lamp 11 shown in FIG. 1 is prepared, and in a state where the lamp is erected vertically (with the end on the stem mount 13 side facing upward) in the water treatment apparatus. The lamp was continuously turned on by supplying a lamp current of 0.8 A, and the ultraviolet illuminance was measured over time. This experiment was performed three times while changing the water temperature conditions in the water treatment apparatus (the first time the water temperature was 25 ° C., the second time was 20 ° C., and the third time was 10 ° C.). Further, as Comparative Example 1, the amalgam lamp 61 shown in FIG. 6 was prepared, and the ultraviolet illuminance was measured under the same conditions as in Example 1. The result is shown in FIG.

  FIG. 4 (1) is a graph showing a change with time in ultraviolet illuminance when the water temperature in the water treatment apparatus is set to 25 ° C. In both Comparative Example 1 and Example 1, the illuminance hardly decreased even after 70 hours had elapsed since the start of lighting.

  FIG. 4 (2) is a graph showing the change with time in the ultraviolet illuminance when the water temperature in the water treatment apparatus is set to 20 ° C. In Comparative Example 1, the illuminance decreased to about 80% when 50 hours passed from the start of lighting, but Example 1 hardly decreased even after 70 hours passed.

  FIG. 4 (3) is a graph showing a change with time in ultraviolet illuminance when the water temperature in the water treatment apparatus is set to 10 ° C. In Comparative Example 1, the illuminance decreased to 70% or less when 70 hours passed from the start of lighting, but Example 1 hardly decreased even after 70 hours passed.

  Moreover, in Example 1, the adhesion of mercury to the tube end portion was not observed, and there was no decrease in ultraviolet illuminance, and good results were obtained. Furthermore, the same effect was confirmed in both cases where the upper and lower sides of Example 1 were exchanged and where Example 1 was mounted sideways.

  Next, as Example 2 of the present invention, an amalgam lamp 21 shown in FIG. 2 is prepared and mounted in a water treatment apparatus in a state where the lamp is set up vertically. The ultraviolet illuminance was measured over time. This experiment was also performed three times while changing the water temperature conditions in the water treatment apparatus (the first time the water temperature was 25 ° C., the second time was 20 ° C., and the third time was 10 ° C.). Further, as Comparative Example 2, the amalgam lamp 71 shown in FIG. 8 was prepared, and the ultraviolet illuminance was measured under the same conditions as in Example 2. The result is shown in FIG.

  FIG. 5 (1) is a graph showing a change with time in ultraviolet illuminance when the water temperature in the water treatment apparatus is set to 25 ° C. In Comparative Example 2, when 60 hours passed from the start of lighting, the illuminance decreased to about 90%, but in Example 2, almost no decrease was observed even after 70 hours passed.

  FIG. 5 (2) is a graph showing a change with time in ultraviolet illuminance when the water temperature in the water treatment apparatus is set to 20 ° C. In Comparative Example 2, when 50 hours passed from the start of lighting, the illuminance decreased to about 80%, but in Example 2, almost no decrease was observed even after 50 hours passed.

  FIG. 5 (3) is a graph showing the change over time in the ultraviolet illuminance when the water temperature in the water treatment apparatus is set to 10 ° C. In Comparative Example 2, when 70 hours passed from the start of lighting, the illuminance dropped to about 70%, but in Example 2, it did not decrease to 95% or less even after 70 hours passed.

  Moreover, in Example 2, the amalgam did not fall off, and the rising of the ultraviolet illuminance was good, and good results were obtained. Furthermore, the same effect was confirmed when Example 2 was mounted sideways.

The block diagram of the amalgam lamp 11 which concerns on the 1st Embodiment of this invention. The block diagram of the amalgam lamp 21 which concerns on the 2nd Embodiment of this invention. FIG. 3 is an enlarged perspective view of a holder 26 and an amalgam 25 shown in FIG. 2. The graph which shows the measurement result of the ultraviolet illumination intensity about Example 1 of this invention. The graph which shows the measurement result of the ultraviolet illumination intensity about Example 2 of this invention. The figure which shows the structural example of the conventional amalgam lamp 61. FIG. The enlarged view of one mount part 68 in the amalgam lamp 61 of FIG. The figure which shows the structural example of the conventional amalgam lamp 71. FIG.

Explanation of symbols

11, 21, 61, 71: Amalgam lamp,
12, 22, 62, 72: quartz bulb,
13, 23, 63, 73: stem mount,
14, 14a, 14b, 24, 64, 74: electrodes,
15, 65: Nickel ring,
16, 66: Ring,
17, 27: convex part,
18: inner end,
19, 69a, 69b, 69c, 79: lead wires,
20a, 20b, 30, 70, 80: coil,
25,75: Amalgam,
26: Holder,
67: Strut wire,
68: Mount part

Claims (6)

It is composed of a bulb that effectively transmits ultraviolet rays of 300 nm or less and electrodes arranged at both ends thereof, and amalgam and rare gas are sealed in the bulb of the bulb or amalgamated by reacting with mercury. In an amalgam sterilization lamp in which metal, mercury, and a rare gas are enclosed,
Among the electrodes, at least one electrode is configured to be supported by a stem mount,
In the vicinity of the stem mount, at a position outside the electrode supported by the stem mount, a metal that reacts with the amalgam or mercury and amalgamates is disposed,
A sterilizing lamp configured to hold the metal that amalgamates by reacting with the amalgam or mercury by a convex portion formed on the bulb.   The sterilizing lamp according to claim 1, wherein the distance from the outer end of the metal that amalgamates to amalgam by reacting with the amalgam or mercury is set to be 10 mm or less.   The distance between the coil of the electrode supported by the stem mount and the outer end of the metal that amalgamates by reacting with the amalgam or mercury is set to 25 to 40 mm. Item 2. The germicidal lamp according to Item 1.   One of the electrodes is not supported by the stem mount, is constituted by a lead wire and a coil, and is dimensioned so that the distance from the coil of the electrode to the inner end of the bulb is 25 mm or less. The sterilizing lamp according to claim 1, wherein: It is composed of a bulb that effectively transmits ultraviolet rays of 300 nm or less and electrodes arranged at both ends thereof, and amalgam and rare gas are sealed in the bulb of the bulb or amalgamated by reacting with mercury. In an amalgam sterilization lamp in which metal, mercury, and a rare gas are enclosed,
A state in which the metal that amalgamates by reacting with the amalgam or mercury is formed in a ring shape, or the metal that amalgamates by reacting with the amalgam or mercury is fixed to the inner peripheral surface of a metal ring-shaped holder In the middle of the quartz bulb,
A sterilizing lamp characterized in that a metal or ring-shaped holder that amalgamates by reacting with the amalgam or mercury is held by a convex portion formed on the bulb.   The sterilizing lamp according to claim 5, wherein the distance from the coil of the electrode to the tube end of the bulb is set to be 25 mm or less.

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