JP6869081B2 - Ultraviolet irradiation device and water sterilizer using it - Google Patents

Ultraviolet irradiation device and water sterilizer using it Download PDF

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JP6869081B2
JP6869081B2 JP2017075679A JP2017075679A JP6869081B2 JP 6869081 B2 JP6869081 B2 JP 6869081B2 JP 2017075679 A JP2017075679 A JP 2017075679A JP 2017075679 A JP2017075679 A JP 2017075679A JP 6869081 B2 JP6869081 B2 JP 6869081B2
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敏行 永原
敏行 永原
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Stanley Electric Co Ltd
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Description

本発明は紫外線照射装置及びこれを用いた水殺菌装置に関する。 The present invention relates to an ultraviolet irradiation device and a water sterilization device using the same.

水の消毒、殺菌、減菌等に用いられる紫外線照射装置における紫外線ランプとして冷陰極紫外線ランプ及び熱陰極紫外線ランプがあるが、長寿命及び小型化の点から冷陰極紫外線ランプの方が優れている。 There are cold cathode ultraviolet lamps and hot cathode ultraviolet lamps as ultraviolet lamps in ultraviolet irradiation devices used for disinfecting, sterilizing, and sterilizing water, but the cold cathode ultraviolet lamp is superior in terms of long life and miniaturization. ..

図５は冷陰極紫外線ランプを用いた従来の紫外線照射装置を示す図である。 FIG. 5 is a diagram showing a conventional ultraviolet irradiation device using a cold cathode ultraviolet lamp.

図５において、紫外線照射装置は、冷陰極紫外線ランプ１、直流電源２及び高周波インバータ回路３よりなる。 In FIG. 5, the ultraviolet irradiation device includes a cold cathode ultraviolet lamp 1, a DC power supply 2, and a high frequency inverter circuit 3.

冷陰極紫外線ランプ１は、たとえば硬質ガラスよりなるガラス管１１と、ガラス管１１の軸方向に互いに対向して設けられた1対の電極１２ａ、１２ｂと、ガラス管１１内で一端が電極１２ａ、１２ｂに結合され、たとえば熱膨張率が低く硬質ガラスの熱膨張率に近いコバールよりなる1対の封着ピン１３ａ、１３ｂと、ガラス管１１の外部で封着ピン１３ａ、１３ｂの他端に結合され、たとえばジュメット線よりなる1対の外部リード線１４ａ、１４ｂと、ガラス管１１の両端の開放端の内周面と封着ピン１３ａ、１３ｂとを溶着する溶着ガラス１５ａ、１５ｂ（図２参照）とによって構成される（参照：特許文献１、２、３、４）。この場合、ガラス管１１の一方の開放端の内周面を溶着ガラス１５ａ、１５ｂの一方で溶着後、Ｈｇ並びに希ガスたとえばＡｒガス及びＨｅガスをガラス管１１に封入し、その後、ガラス管１１の他方の開放端の内周面を溶着ガラス１５ａ、１５ｂの他方で溶着する。 The cold cathode ultraviolet lamp 1 includes, for example, a glass tube 11 made of hard glass, a pair of electrodes 12a and 12b provided so as to face each other in the axial direction of the glass tube 11, and an electrode 12a at one end in the glass tube 11. Bonded to 12b, for example, a pair of sealing pins 13a, 13b made of coval, which has a low coefficient of thermal expansion and is close to the coefficient of thermal expansion of hard glass, and the other end of the sealing pins 13a, 13b outside the glass tube 11. Welded glass 15a, 15b that welds a pair of external lead wires 14a, 14b made of, for example, a jumet wire, the inner peripheral surfaces of the open ends at both ends of the glass tube 11, and the sealing pins 13a, 13b (see FIG. 2). ) (Reference: Patent Documents 1, 2, 3, 4). In this case, one of the open ends of the inner peripheral surface of the welding glass 15a of the glass tube 11, after the one hand welding 15b, the Hg and a rare gas such as Ar gas and He gas sealed in the glass tube 11, then, the glass tube 11 welding the inner peripheral surface of the other open end welding glass 15a, the other 15b.

直流電源２はたとえば交流電源（図示せず）に接続された整流平滑回路よりなりその直流電圧により高周波インバータ回路３を駆動する。この場合、高周波インバータ回路３の駆動電圧Ｖｄは直流電源２の直流電圧と一致する。高周波インバータ回路３は３０〜５０ｋＨｚ程度の交流電圧を発生する（参照：特許文献５の図２）。この結果、ガラス管11内で電子→希ガス→水銀の衝突により水銀が電離して放電し紫外線が発生する。 The DC power supply 2 is composed of, for example, a rectifying and smoothing circuit connected to an AC power supply (not shown), and drives the high frequency inverter circuit 3 by the DC voltage thereof. In this case, the drive voltage V d of the high-frequency inverter circuit 3 coincides with the DC voltage of the DC power supply 2. The high-frequency inverter circuit 3 generates an AC voltage of about 30 to 50 kHz (see: FIG. 2 of Patent Document 5). As a result, mercury is ionized and discharged by the collision of electrons, noble gases, and mercury in the glass tube 11, and ultraviolet rays are generated.

特開２０１０−１９２０２０号公報（特許第４９０２７０６号公報）Japanese Unexamined Patent Publication No. 2010-192020 (Patent No. 4902706) 特開２０１０−１８２４５６号公報（特許第４９３４１５６号公報）Japanese Unexamined Patent Publication No. 2010-182456 (Patent No. 4934156) 特開２０１１−５４５５７号公報（特許第５６２９１４８号公報）Japanese Unexamined Patent Publication No. 2011-54557 (Patent No. 5629148) 特開２０１１−２３８６１９号公報（特許第５４５１６８８号公報）Japanese Unexamined Patent Publication No. 2011-238619 (Patent No. 5451688) 特開平５−２９０８５号公報Japanese Unexamined Patent Publication No. 5-29085

しかしながら、図５に示す従来の紫外線照射装置においては、直流電源２がオンとされると、常時点灯状態となるので、水殺菌装置に適用した場合、処理水の温度が上昇するという課題がある。 However, in the conventional ultraviolet irradiation device shown in FIG. 5, when the DC power supply 2 is turned on, it is always lit, so that when applied to a water sterilizer, there is a problem that the temperature of the treated water rises. ..

上述の課題を解決するために、本発明に係る紫外線照射装置は、冷陰極紫外線ランプ光源と、冷陰極紫外線ランプを放電するための高周波電圧を発生するための高周波インバータ回路と、高周波インバータ回路に直流電圧を印加するための直流電源と、直流電源と高周波インバータ回路との間に設けられたスイッチと、スイッチをオンオフ制御するための制御ユニットとを具備し、冷陰極紫外線ランプは、ガラス管と、ガラス管の軸方向に互いに対向して設けられた１対の電極と、１対の外部リード線と、ガラス管内で一端が各電極に結合され、ガラス管外で他端が外部リード線に結合された１対の封着ピンと、各封着ピンをガラス管の両端開放部の内周面に溶着するための１対の溶着ガラスとを具備し、各溶着ガラスのガラス管の軸方向長さが１．５〜３．５ｍｍであり、各溶着ガラスのガラス管の軸方向に垂直な幅が２．７５〜３．８５ｍｍであり、各封着ピンの直径が０．６５〜０．９５ｍｍであるものである。

In order to solve the above-mentioned problems, the ultraviolet irradiation device according to the present invention includes a cold cathode ultraviolet lamp light source, a high frequency inverter circuit for generating a high frequency voltage for discharging the cold cathode ultraviolet lamp, and a high frequency inverter circuit. a DC power source for applying a DC voltage, a switch provided between a DC power supply and the high-frequency inverter circuit, and a control unit for turning on and off the switch, cold cathode ultraviolet lamp has a glass tube , A pair of electrodes provided so as to face each other in the axial direction of the glass tube, a pair of external lead wires, one end is coupled to each electrode inside the glass tube, and the other end is an external lead wire outside the glass tube. A pair of bonded sealing pins and a pair of welded glasses for welding each sealing pin to the inner peripheral surface of the open portion at both ends of the glass tube are provided, and the axial length of the glass tube of each welded glass is provided. The width is 1.5 to 3.5 mm, the width perpendicular to the axial direction of the glass tube of each welded glass is 2.75 to 3.85 mm, and the diameter of each sealing pin is 0.65 to 0.95 mm. Is what.

また、本発明に係る水殺菌装置は、上述の紫外線照射装置と、処理水の流路としての第１の中空及び紫外線照射装置を収容するための第２の中空を有するケーシングとを具備する。又は、上述の紫外線照射装置と、処理水の流路として作用すると共に紫外線照射装置を収容するための中空を有するケーシングとを具備するものである。 Further, the water sterilizer according to the present invention includes the above-mentioned ultraviolet irradiation device and a casing having a first hollow as a flow path for treated water and a second hollow for accommodating the ultraviolet irradiation device. Alternatively, it is provided with the above-mentioned ultraviolet irradiation device and a casing having a hollow space for accommodating the ultraviolet irradiation device while acting as a flow path for the treated water.

本発明によれば、水殺菌装置に適用した場合、スイッチのオン期間内に冷陰極紫外線ランプの高周波電圧を維持しているので、処理水の殺菌力を維持でき、他方、スイッチのオフ期間に冷陰極紫外線ランプをオフにするので処理水の温度の上昇を抑制できる。 According to the present invention, when applied to a water sterilizer, the high frequency voltage of the cold cathode ultraviolet lamp is maintained during the switch on period, so that the sterilizing power of the treated water can be maintained, while the switch is off. Since the cold cathode ultraviolet lamp is turned off, the temperature rise of the treated water can be suppressed.

本発明に係る紫外線照射装置の実施の形態を示す図である。It is a figure which shows the embodiment of the ultraviolet irradiation apparatus which concerns on this invention. 図１の溶着部の拡大図である。It is an enlarged view of the welded part of FIG. 図１の溶着部の時定数の例を示す表である。It is a table which shows the example of the time constant of the welded part of FIG. 図１の紫外線照射装置を用いた水殺菌装置を示す図であって、（Ａ）は縦断面図、（Ｂ）は横断面図である。It is a figure which shows the water sterilizer using the ultraviolet irradiation apparatus of FIG. 1, (A) is a vertical sectional view, (B) is a cross-sectional view. 従来の紫外線照射装置を示す図である。It is a figure which shows the conventional ultraviolet irradiation apparatus.

図１は本発明の係る紫外線照射装置の実施の形態を示す図である。 FIG. 1 is a diagram showing an embodiment of the ultraviolet irradiation device according to the present invention.

図１においては、図５の直流電源２と高周波インバータ回路３との間にスイッチ４を設けると共に、スイッチ４をオンオフ制御するための制御ユニット（たとえばマイクロコンピュータ）５を設ける。たとえば、制御ユニット５はオン期間ＴＯＮ及びオフ期間ＴＯＦＦの繰り返し周期でスイッチ４をオンオフ制御する。この結果、オン期間ＴＯＮにおいて、冷陰極紫外線ランプ１が紫外線を発生して水の殺菌力を発揮し、オフ期間ＴＯＦＦにおいて殺菌水の温度が低下する。この場合、オン期間ＴＯＮが増大する程、水の殺菌力は増大し、他方、オフ期間ＴＯＦＦが増大する程、水の温度が低下する。たとえば、ＴＯＮを０．５ｓとし、他方、ＴＯＦＦを０．５ｓとするが、適宜変更できる。 In FIG. 1, a switch 4 is provided between the DC power supply 2 and the high-frequency inverter circuit 3 of FIG. 5, and a control unit (for example, a microcomputer) 5 for controlling the on / off of the switch 4 is provided. For example, the control unit 5 controls the switch 4 on and off in a repeating cycle of an on period T ON and an off period T OFF. As a result, the ON period T ON, cold cathode ultraviolet lamp 1 is generated ultraviolet rays exert germicidal water, the temperature of the sterilizing water is decreased in the OFF period T OFF. In this case, the bactericidal activity of water increases as the ON period T ON increases, while the temperature of water decreases as the T OFF during the OFF period increases. For example, T ON is 0.5 s and T OFF is 0.5 s, which can be changed as appropriate.

また、図１においては、高周波インバータ回路３の駆動電圧Ｖｄは制御ユニット５によってスイッチ４を介してオンオフ制御される。このオンオフ制御された駆動電圧Ｖｄの立上がり立下りは冷陰極紫外線ランプ１の内部構造に依存する。つまり、オフ期間ＴＯＦＦでは、冷陰極紫外線ランプ１は冷却状態となっているので、オン期間ＴＯＮにおける高周波インバータ回路３の駆動電圧Ｖｄの立上がり時間が大きい程、紫外線発光開始が遅くなり、処理水の殺菌力が低下する。他方、オン期間ＴＯＮの終期における高周波インバータ回路３の駆動電圧Ｖｄの立下り時間が大きい程、処理水の温度低下が遅くなる。従って、上述の高周波インバータ回路３の駆動電圧Ｖｄの立上がり時間及び立下り時間を共に小さくする必要がある。この立上がり時間及び立下り時間は冷陰極紫外線ランプ１の溶着部の時定数τに依存する。 Further, in FIG. 1, the drive voltage V d of the high-frequency inverter circuit 3 is on / off controlled by the control unit 5 via the switch 4. The rise and fall of the drive voltage V d whose on / off control is controlled depends on the internal structure of the cold cathode ultraviolet lamp 1. That is, in the OFF period T OFF, since the cold cathode ultraviolet lamp 1 is in a cooled state, as rising time of the driving voltage V d of the high-frequency inverter circuit 3 is large in the ON period T ON, ultraviolet light initiation It slows down and reduces the bactericidal activity of the treated water. On the other hand, as the fall time of the driving voltage V d of the high-frequency inverter circuit 3 is large at the end of the ON period T ON, the temperature drop of the treated water becomes slow. Therefore, it is necessary to reduce both the rise time and the fall time of the drive voltage V d of the above-mentioned high-frequency inverter circuit 3. The rise time and fall time depend on the time constant τ of the welded portion of the cold cathode ultraviolet lamp 1.

図２は図１の冷陰極紫外線ランプ１の溶着部の拡大図である。図２に示すように、溶着部は封着ピン１３ａ（１３ｂ）とガラス管１１（図２に図示せず）の内面とを溶着する溶着ガラス（硬質ガラス）１５ａ（１５ｂ）によって構成され、溶着ガラス１５ａ（１５ｂ）の外側には、図２には図示していないが、ガラス管１１の端部の内面が存在する。つまり、溶着ガラス部はガラス管１１に封止ピン１３ａ（１３ｂ）を溶着する。この場合の溶着ガラス部の時定数τは、
τ＝（封着ピン１３ａ（１３ｂ）の抵抗値Ｒ）
×（ガラス管１１及び溶着ガラス１５ａ（１５ｂ）よりなる誘電体の浮遊容量Ｃ）
によって決定される。 FIG. 2 is an enlarged view of the welded portion of the cold cathode ultraviolet lamp 1 of FIG. As shown in FIG. 2, the welded portion is composed of welded glass (hard glass) 15a (15b) that welds the sealing pin 13a (13b) and the inner surface of the glass tube 11 (not shown in FIG. 2). On the outside of the glass 15a (15b), although not shown in FIG. 2, there is an inner surface of the end of the glass tube 11. That is, the welded glass portion welds the sealing pins 13a (13b) to the glass tube 11. The time constant τ of the welded glass portion in this case is
τ = (resistance value R of sealing pins 13a (13b))
× (Stray capacitance C of a dielectric composed of a glass tube 11 and welded glass 15a (15b))
Determined by.

図３は封着ピン（コバール）１３ａ、１３ｂの直径Ｄ及び溶着ガラス１５ａ、１５ｂのガラス管１１の軸方向長さＬと溶着部の時定数τとの関係を示す表である。 FIG. 3 is a table showing the relationship between the diameter D of the sealing pins (Kovar) 13a and 13b, the axial length L of the glass tube 11 of the welded glass 15a and 15b, and the time constant τ of the welded portion.

図３に示すように、溶着ガラス１５ａ（１５ｂ）の長さＬが１．５ｍｍ未満ではリークが発生する。また、溶着ガラス１５ａ（１５ｂ）の長さＬが１．５ｍｍ以上でも、封着ピン１３ａ（１３ｂ）の直径Ｄが０．６５ｍｍ未満では、溶着ガラス部の歪みが大きく、封着ピン１３ａ（１３ｂ）の直径Ｄが０．９５ｍｍ以上では、溶着部の構造が不成立である。さらに、溶着ガラス１５ａ（１５ｂ）の長さＬが３．５ｍｍを超え、かつ封着ピン１３ａ（１３ｂ）の直径Ｄが０．６５〜０．９５ｍｍでは、時定数τが１μｓより大きい。従って、時定数τが１μｓ以下で、リークも発生せず、溶着ガラス部の歪みもなく、構造成立するのは、一重丸及び二重丸で示した領域である。この領域では、溶着ガラス１５ａ（１５ｂ）の長さＬはＬ＝１．５〜３．５ｍｍであり、封着ピン１３ａ（１３ｂ）の直径ＤはＤ＝０．６５〜０．９５ｍｍであり、溶着ガラス１５ａ（１５ｂ）のガラス管１１の軸方向に垂直な幅Ｗは２．７５〜３．８５ｍｍである。さらに、一重丸の領域より時定数τが小さくなる二重丸で示す領域では、Ｌ＝２．５〜３．５ｍｍ、Ｄ＝０．７５〜０．８５ｍｍである。これにより、冷陰極紫外線ランプ１のオンオフ特性が向上する。 As shown in FIG. 3, if the length L of the welded glass 15a (15b) is less than 1.5 mm, a leak occurs. Further , even if the length L of the welded glass 15a (15b) is 1.5 mm or more, if the diameter D of the sealing pin 13a (13b) is less than 0.65 mm, the welding glass portion is significantly distorted and the sealing pin 13a (13b) is distorted. ) With a diameter D of 0.95 mm or more, the structure of the welded portion is unsuccessful. Further, when the length L of the welded glass 15a (15b) exceeds 3.5 mm and the diameter D of the sealing pin 13a (13b) is 0.65 to 0.95 mm, the time constant τ is larger than 1 μs. Therefore, the time constant τ is 1 μs or less, no leak occurs, there is no distortion of the welded glass portion , and the structure is established in the regions shown by the single circle and the double circle. In this region, the length L of the welded glass 15a (15b) is L = 1.5 to 3.5 mm, and the diameter D of the sealing pin 13a (13b) is D = 0.65 to 0.95 mm. The width W of the welded glass 15a (15b) perpendicular to the axial direction of the glass tube 11 is 2.75 to 3.85 mm. Further, in the region indicated by the double circle whose time constant τ is smaller than that of the single circle region, L = 2.5 to 3.5 mm and D = 0.75 to 0.85 mm. This improves the on / off characteristics of the cold cathode ultraviolet lamp 1.

図４は図１の紫外線照射装置を用いた流水タイプ外照式の水殺菌装置を示す図であって、（Ａ）は縦断面図、（Ｂ）は（Ａ）のＢ−Ｂ線横断面図である。
Figure 4 is a diagram showing a water sterilization apparatus of the flowing water type outside irradiation type using an ultraviolet ray irradiation apparatus of FIG. 1, (A) is a longitudinal sectional view, (B) is the line B-B cross of (A) It is a top view.

図４において、アルミニウムあるいはアルミニウム合金、又は樹脂の内面にアルミニウム又はアルミニウム合金を貼る、蒸着するあるいはメッキしたものよりなる円筒上のケーシング（リアクタ）６には、処理水の流路としての中空６１及び冷陰極紫外線ランプ１を収容する中空６２が設けられる。処理水は中空６１の流入口６１ａから流出口６１ｂへ流れるが、処理水は冷陰極紫外線ランプ１が存在する中空６２に侵入することはない。 In FIG. 4, a cylindrical casing (reactor) 6 made of aluminum or an aluminum alloy, or an aluminum or aluminum alloy pasted, vapor-deposited, or plated on the inner surface of a resin has a hollow 61 as a flow path for treated water and a hollow 61. A hollow 62 for accommodating the cold cathode ultraviolet lamp 1 is provided. The treated water flows from the inflow port 61a of the hollow 61 to the outflow port 61b, but the treated water does not enter the hollow 62 in which the cold cathode ultraviolet lamp 1 is present.

本発明は、上述の流水タイプ外照式の外に、留め水タイプ外照式の水殺菌装置、流水タイプ内照式の水殺菌装置、留め水タイプ内照式の水殺菌装置にも適用できる。尚、内照式の場合、ケーシングには、処理水の流路として作用すると共に紫外線照射装置を収容する１つの中空が設けられる。 The present invention can be applied not only to the above-mentioned running water type external lighting type, but also to a water retaining type external lighting type water sterilizer, a running water type internal lighting type water sterilizer, and a water retention type internal lighting type water sterilizer. .. In the case of the internally illuminated type, the casing is provided with one hollow that acts as a flow path for the treated water and accommodates the ultraviolet irradiation device.

尚、上述の実施の形態においては、冷陰極紫外線ランプ１は直管タイプであるが、Ｕ型タイプにもなし得る。 In the above-described embodiment, the cold cathode ultraviolet lamp 1 is a straight tube type, but it can also be a U type.

また、本発明は上述の実施の形態の自明の範囲でいかなる変更にも適用し得る。 The present invention may also be applied to any modification within the obvious scope of the embodiments described above.

本発明は、浄水器、ウォータクーラ、ウォータサーバ、加湿器、食器洗い洗浄機、洗濯機、デンタルチュア等における水殺菌装置に利用できる。 INDUSTRIAL APPLICABILITY The present invention can be used for a water sterilizer in a water purifier, a water cooler, a water server, a humidifier, a dishwasher, a washing machine, a dental tea, and the like.

１：冷陰極紫外線ランプ
１１：ガラス管
１２ａ、１２ｂ：電極
１３ａ、１３ｂ：封着ピン
１４ａ、１４ｂ：外部リード線
１５ａ、１５ｂ：溶着ガラス
２：直流電源
３：高周波インバータ回路
４：スイッチ
５：制御ユニット
６：ケーシング（リアクタ）
６１、６２：中空 1: Cold cathode ultraviolet lamp 11: Glass tube 12a, 12b: Electrode 13a, 13b: Sealing pin 14a, 14b: External lead wire 15a, 15b: Welded glass 2: DC power supply 3: High frequency inverter circuit 4: Switch 5: Control Unit 6: Casing (reactor)
61, 62: Hollow

Claims (5)

冷陰極紫外線ランプ光源と、
前記冷陰極紫外線ランプを放電するための高周波電圧を発生するための高周波インバータ回路と、
前記高周波インバータ回路に直流電圧を印加するための直流電源と、
前記直流電源と前記高周波インバータ回路との間に設けられたスイッチと、
前記スイッチをオンオフ制御するための制御ユニットと
を具備し、
前記冷陰極紫外線ランプは、
ガラス管と、
前記ガラス管の軸方向に互いに対向して設けられた１対の電極と、
１対の外部リード線と、
前記ガラス管内で一端が前記各電極に結合され、前記ガラス管外で他端が前記外部リード線に結合された１対の封着ピンと、
前記各封着ピンを前記ガラス管の両端開放部の内周面に溶着するための１対の溶着ガラスと
を具備し、
前記各溶着ガラスの前記ガラス管の軸方向長さが１．５〜３．５ｍｍであり、
前記各溶着ガラスの前記ガラス管の軸方向に垂直な幅が２．７５〜３．８５ｍｍであり、
前記各封着ピンの直径が０．６５〜０．９５ｍｍである紫外線照射装置。 Cold cathode UV lamp light source and
A high-frequency inverter circuit for generating a high-frequency voltage for discharging the cold-cathode ultraviolet lamp, and a high-frequency inverter circuit.
A DC power supply for applying a DC voltage to the high-frequency inverter circuit,
A switch provided between the DC power supply and the high-frequency inverter circuit,
It is equipped with a control unit for on / off control of the switch.
The cold cathode ultraviolet lamp is
With a glass tube
A pair of electrodes provided so as to face each other in the axial direction of the glass tube,
A pair of external leads and
A pair of sealing pins, one end of which is coupled to each of the electrodes inside the glass tube and the other end of which is coupled to the external lead wire outside the glass tube.
With a pair of welded glass for welding each sealing pin to the inner peripheral surface of the open portion at both ends of the glass tube.
Equipped with
The axial length of the glass tube of each of the welded glasses is 1.5 to 3.5 mm.
The width of each welded glass perpendicular to the axial direction of the glass tube is 2.75 to 3.85 mm.
An ultraviolet irradiation device having a diameter of each sealing pin of 0.65 to 0.95 mm. 前記各溶着ガラスの前記ガラス管の軸方向長さが２．５〜３．５ｍｍであり、
前記各封着ピンの直径が０．７５〜０．８５ｍｍである請求項１に記載の紫外線照射装置。 The axial length of the glass tube of each of the welded glasses is 2.5 to 3.5 mm.
The ultraviolet irradiation device according to claim 1 , wherein the diameter of each sealing pin is 0.75 to 0.85 mm. 前記ガラス管は硬質ガラスよりなり、
前記外部リード線はジュメット線であり、
前記各封着ピンはコバールよりなり、
前記溶着ガラスは硬質ガラスよりなる
請求項１又は２に記載の紫外線照射装置。 The glass tube is made of hard glass
The external lead wire is a Jumet wire and
Each of the sealing pins is made of Kovar and
The ultraviolet irradiation device according to claim 1 or 2 , wherein the welded glass is made of hard glass. 請求項１〜３のいずれかに記載の紫外線照射装置と、
処理水の流路としての第１の中空及び前記紫外線照射装置を収容するための第２の中空を有するケーシングと
を具備する水殺菌装置。 The ultraviolet irradiation device according to any one of claims 1 to 3 and
A water sterilizer including a casing having a first hollow as a flow path for treated water and a second hollow for accommodating the ultraviolet irradiation device. 請求項１〜３のいずれかに記載の紫外線照射装置と、
処理水の流路として作用すると共に前記紫外線照射装置を収容するための中空を有するケーシングと
を具備する水殺菌装置。 The ultraviolet irradiation device according to any one of claims 1 to 3 and
A water sterilizer that acts as a flow path for treated water and has a hollow casing for accommodating the ultraviolet irradiation device.
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