JPH1186791A - Ultraviolet-ray radiating low-pressure mercury vapor discharge lamp, low-pressure mercury vapor discharge lamp unit and fluid sterilizing device - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide an ultraviolet-ray radiating low pressure mercury vapor discharge lamp, which can increase in ultraviolet-ray output though compact in size, a low pressure mercury vapor discharge lamp unit using this lamp, and a fluid sterilizing device. SOLUTION: In both end parts in the inside of an air tight vessel 1 of ultraviolet-ray permeable material in an external diameter of 3 to 12 mm with a total width of less than 30 mm, including a flexed part 1a2 and a straight line part 1a1 capable of being made to form a flexed discharge path in the inside, a pair of electrodes 2 are seal mounted, in the air tight vessel 1, mercury and rare gases are sealed. In the case of forming the air tight vessel by quartz glass, by providing a pinch seal part 1b by arranging its flat surface sequentially almost in parallel with both ends, a total width of a lamp can be decreased. Further, by arranging an exhaust chip 1c in a linear part of the air tight vessel 1, damage by its distortion can be reduced. This lamp is stored to be sealed in an ultraviolet-ray permeable protecting tube, a low-pressure mercury vapor lamp unit is constituted, ad moreover by assembling the unit, a fluid sterilizing device can be obtained.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an ultraviolet radiation type low pressure mercury vapor discharge lamp, a low pressure mercury vapor discharge lamp unit using the same, and a fluid sterilizer.

[0002]

2. Description of the Related Art Japanese Utility Model Laid-Open No. 5-20744 and Japanese Utility Model Laid-Open No.
As described in JP-A-13485, a liquid sterilizing apparatus that disposes an ultraviolet lamp in a liquid flow path and irradiates ultraviolet rays to sterilize a liquid is conventionally known. In this liquid sterilizer, an ultraviolet lamp which is sealed in a liquid by being housed in an ultraviolet transparent protective tube is disposed inside a liquid sterilizer main body having a liquid inlet and a liquid outlet. In many cases, a configuration is used in which liquid is sterilized in the process of flowing a liquid around the protective tube.

An ultraviolet lamp used in a conventional relatively small liquid sterilizing apparatus is a straight-tube low-pressure mercury vapor discharge lamp in which a discharge vessel is made of ultraviolet-permeable glass. This UV lamp has a tube length of 210.5 mm (total length of 226.3 mm or less) in the GL6 type.
UV power of 253.7 nm with lamp power of 6 W is 1
W. Even if the lamp input is further increased, the ultraviolet ray output can hardly be increased.

[0004]

One example of the use of a relatively small liquid sterilizer is water sterilization in a bath for 24 hours. Recently, however, the problem of poor sterilization against Legionella bacteria has been raised.

In order to improve the sterilizing ability, it is necessary to increase the ultraviolet output. However, as described above, the ultraviolet output cannot be further increased.

[0006] If an ultraviolet lamp with a large rated power is used, the ultraviolet output can be increased, but the liquid sterilizer becomes large and expensive, and cannot be widely used in general households. There's a problem.

The present invention provides a low-pressure mercury vapor discharge lamp of an ultraviolet radiation type which can increase the sterilizing line output while having a compact size, a low-pressure mercury vapor discharge lamp unit using the same, and a fluid sterilizer. The purpose is to:

[0008]

According to the first aspect of the present invention, there is provided an ultraviolet radiation type low-pressure mercury vapor discharge lamp including a bent portion and a straight portion, and having an outer diameter of 3 to 10 mm capable of forming an internally bent discharge path. An airtight container made of an ultraviolet-permeable material having a total width of less than 30 mm; a pair of electrodes sealed at both ends in the airtight container; and a discharge medium containing mercury and a rare gas sealed in the airtight container. It is characterized by having.

In the present invention and the following inventions, the definitions and technical meanings of terms are as follows unless otherwise specified.

Airtight Container The airtight container is formed in a U-shape, a W-shape or the like including a bent portion and a straight portion. In order to manufacture such an airtight container, one tube is heated and softened and bent to form a bent discharge path therein.
In addition, connecting a plurality of straight pipes with a connecting pipe, closing the ends of the plurality of straight pipes, locally heating and melting the vicinity of the ends, and increasing the internal pressure, thereby connecting by blowing. It is also possible to form a discharge path which is formed by forming portions and connecting the connection portions to each other.

In short, in the present invention, the specific structure and manufacturing method of the hermetic container are not limited as long as it includes a bent portion and a straight portion and can form a bent discharge path inside.

The airtight container is not limited to a specific material as long as it is an ultraviolet-permeable material. For example, quartz glass,
Ultraviolet transmitting materials such as soda lime glass containing 20 ppm or less of iron dioxide Fe ₂ O ₃ and glass containing a large amount of barium oxide BaO can be used.

The reason why the outer diameter of the airtight container is limited to 3 to 12 mm is as follows. That is, if it is less than 3 mm, the lamp voltage becomes too high and becomes impractical. On the other hand, if it exceeds 12 mm, the entire width of the ultraviolet radiation type low-pressure mercury vapor discharge lamp easily exceeds 30 mm, which leads to an increase in the size of the fluid sterilizer.

The reason why the total width of the airtight container is limited to less than 3 mm is as follows. That is, 30 mm
If it exceeds, the size of the fluid sterilizer will be increased.

Further, when an ultraviolet radiation type low pressure mercury vapor discharge lamp is used by being housed in a quartz glass protective tube,
The protection tube becomes expensive.

Furthermore, the entire width of the hermetic container can be changed between the vicinity of the bent portion and the vicinity of both ends within the above numerical range. For example, if the entire width near the both ends is made narrower than the vicinity of the bent portion, the width of the die body can be suppressed to less than 30 mm when the die bodies are attached to both end parts.

The discharge path length of the hermetic container can be appropriately set according to the desired lamp power and the allowable secondary no-load voltage.

Regarding the electrode The electrode may be either a hot cathode or a cold cathode.

When a hot cathode is used, a filament electrode is connected between the inner ends of a pair of introduction wires, and the filament is coated with an electron emitting material.

When a cold cathode is used, a tungsten coil is wound one or two times around the tip of a tungsten electrode shaft and coated with an electron emitting material, or a nickel rod or a nickel cylinder is coated with the electron emitting material. Various known cold cathodes, such as those coated, can be used.

Regarding the Discharge Medium The discharge medium contains mercury and a rare gas, and the mercury can be sealed in the form of pure mercury or in the form of amalgam.

As the rare gas, neon, argon, krypton, or the like can be used. In particular, when the encapsulation ratio of neon is increased, the luminous efficiency is increased. But in this case,
Since the startability is reduced, it is necessary to increase the secondary no-load voltage of the lighting device.

In the present invention, the tube length can be made substantially the same as the conventional one by bending the airtight container which is thinner and longer than the conventional one.

In addition, by restricting the total width of the airtight container to less than 30 mm, in combination with the above, the airtight container can be used in combination with a conventional fluid sterilizer main body, or can be reduced without changing the basic size of the fluid sterilizer main body. It can be used in combination only by changing.

When the total length of the ultraviolet radiation type low-pressure mercury vapor discharge lamp is 200 mm or less in addition to defining the outer diameter and the overall width of the hermetic container, it is possible to increase the ultraviolet output while being more compact. Can be.

Further, even if the ultraviolet radiation type low-pressure mercury vapor discharge lamp is housed in a quartz glass protective tube, the protective tube can have an outer diameter of 30 mm or less. Can be used.

Further, in the present invention, the lamp output can be increased by increasing the lamp power. For example, when the lamp power is set to 10 W, an ultraviolet output of 2.5 W can be obtained.

The ultraviolet radiation type low-pressure mercury vapor discharge lamp according to the second aspect of the present invention includes a bent portion and a straight portion, can form a bent discharge path therein, and has a flattened plane at both ends substantially parallel to each other. An airtight container made of quartz glass having a pair of pinch seal portions; a pair of electrodes sealed at both ends in the airtight container via pinch seal portions; including mercury and a rare gas sealed in the airtight container And a discharge medium.

According to the present invention, the outer diameter of the airtight container is 3 to 12 m.
m, particularly effective when the overall width is less than 30 mm, but is not limited thereto.

One of the characteristic constitutions of the present invention is that the hermetic container is formed of quartz glass, and the electrodes are sealed via a pair of pinch seals formed at both ends of the hermetic container. By forming the hermetic container from quartz glass, the mechanical strength of the hermetic container is improved, and the lamp power can be increased.

When quartz glass is used as a constituent material of the airtight container, several methods are known as a structure for sealing the electrodes, but the pinch seal method is most suitable for a small airtight container.

However, in the pinch seal method,
When the pair of pinch seals approach each other because the pinch seals are flat, if the pair of pinch seals are aligned so that they are in the same plane, the pinch seals must not interfere with each other. Inevitably becomes larger.

On the other hand, another characteristic feature of the present invention is that the deflected surfaces of the pinch seal portions are aligned substantially parallel. Thereby, the straight portion of the hermetic container can be made as close as possible, and as a result, the overall width of the hermetic container can be reduced.

The ultraviolet radiation type low pressure mercury vapor discharge lamp according to the third aspect of the present invention includes a bent portion and a straight portion, can form a bent discharge path therein, and has a pair of pinch seal portions at both ends. An airtight container made of quartz glass having an inner diameter of 2 to 10 mm and a protective film made of metal oxide fine particles formed on an inner surface thereof; a pair of electrodes sealed at both ends in the airtight container via pinch seal portions; And a discharge medium containing 50% or more of a rare gas in which mercury and neon are sealed.

The present invention is particularly effective when the total width of the airtight container is less than 30 mm, but is not limited to this. In addition, the pinch seal portions are formed at both ends of the airtight container to seal the electrodes, and the uneven planes of the pinch seal portions can be aligned substantially parallel.

In the present invention, the protective film prevents mercury ions from being driven into the wall of the hermetic container to reduce mercury, thereby increasing the lamp voltage and prematurely extinguishing the lamp. It is used for the purpose.

As a constituent material of the protective film, for example, alumina, silica, or a rare earth metal such as yttrium oxide can be used.

When the protective film is formed on the inner surface of the hermetic container, the protective film attached to the end portion from the tip of the electrode is removed before sealing the hermetic container, so that the protective film is not formed on the end portion. By doing so, the sealing property is not impaired.

Thus, as a rare gas constituting a part of the discharge medium, neon is contained in a proportion of 50% or more, particularly notably 95% or more, the sealing pressure is 80 to 100 torr, and the inner surface of the hermetic container is Tube wall load is 0.1 ~ 0.3W / c
When operated at m ² , luminous efficiency can be increased, but the acceleration of mercury ions is large because neon is light in mass. For this reason, mercury ions are strongly hit into the wall surface of the airtight container, and mercury is consumed quickly.

However, in the present invention, since the protective film is formed on the inner surface of the hermetic container, mercury ions are prevented by the protective film and are less likely to be hit into the wall surface of the hermetic container. And luminous efficiency can be maintained high.

According to a fourth aspect of the present invention, there is provided an ultraviolet radiation type low-pressure mercury vapor discharge lamp according to any one of the first to third aspects, wherein the exhaust gas is disposed in a straight portion. It is characterized by having a chip portion.

It is general to exhaust the inside of the airtight container, attach an exhaust pipe to seal mercury and a rare gas, and exhaust, seal after sealing, and form an exhaust tip portion. By stipulating the location of the part,
It is intended to reduce damage caused by distortion of the airtight container.

If the airtight container has a bent portion, a distortion is generated in the bent portion when the bent portion is formed by bending or the like. Therefore, the distortion is removed through a strain removing step. Will remain.

Therefore, when the exhaust pipe is attached to the bent portion, further distortion occurs, and the airtight container is easily damaged from the exhaust pipe attachment portion.

Even when the exhaust pipe is installed in a straight pipe state, a problem of distortion occurs.

That is, an exhaust pipe is attached to a straight pipe made of an ultraviolet-permeable material such as quartz glass, and electrodes are sealed at both ends of the straight pipe. Next, the bent portion of the straight pipe is locally heated and softened to obtain a bent airtight container. Thereafter, after the airtight container is evacuated, mercury and a rare gas are sealed therein, and the exhaust pipe is sealed to form an exhaust chip portion. Finally, the entire hermetic container is placed in a lehr and heated to remove strain, and gradually cooled to obtain a low-pressure mercury vapor discharge lamp. In the case of such a manufacturing method, since a desired high temperature cannot be obtained, even if a strain removing step is provided, the strain is not sufficiently removed.

Therefore, even if the exhaust pipe is attached in a straight pipe state, if the exhaust tip is provided at the bent portion, the airtight container is likely to be damaged due to distortion.

In the present invention, since the exhaust tip portion is provided on the straight portion of the airtight container, distortion due to the attachment of the exhaust pipe is less likely to occur.

Accordingly, even if a bent portion is formed in the hermetic container, the breakage of the hermetic container due to the strain caused by the attachment of the exhaust pipe can be significantly reduced without intervening a strain removing step.

According to a fifth aspect of the present invention, there is provided an ultraviolet radiation type low pressure mercury vapor discharge lamp according to any one of the first to fourth aspects, wherein both ends of an airtight container are integrated. It is characterized by having a UV-resistant base for supporting.

In the present invention, both ends of the airtight container are arranged so as to concentrate on one side.

In order to support both ends of the hermetic container with the base, seal portions at both ends of the hermetic container are attached to the base, so that a part of the ultraviolet light emitting portion is shielded by the base and the effective amount of ultraviolet light is reduced. It does not decrease. Particularly when the hermetic container is made of quartz glass to form pinch seal portions at both ends, it is extremely effective if a part of the pinch seal portion is inserted into the base to support the hermetic container. .

In order to seal the space between the base body and both ends of the airtight container as necessary, it is sufficient to bond them together with, for example, a silicone resin.

The base body functions not only to support the wiring to the electrodes, but also to support the ultraviolet radiation type low pressure mercury vapor discharge lamp.

When a low-pressure mercury vapor discharge lamp unit having a protective tube is formed, the base can be used to seal the protective tube in a liquid-tight manner.

As an ultraviolet-resistant material suitable for use as a base, for example, a fluororesin can be used.

According to a sixth aspect of the present invention, there is provided a low-pressure mercury vapor discharge lamp unit according to the fifth aspect, wherein the low-pressure mercury vapor discharge lamp is housed inside and the opening end is formed in a base. A protective tube made of a UV-transmissive material that is sealed and supported; a holder that seals and supports an open end of the protective tube; and a lighting device for a low-pressure mercury vapor discharge lamp provided in the holder. It is characterized by:

The specific means for sealing and supporting the protective tube on the base body is not limited, but, for example, the two can be bonded with a silicone resin.

Similarly, in order to seal between the protective tube and the holder, sealing means such as packing or bonding can be used.

The holder can be used, for example, as a mounting portion when the low-pressure mercury vapor discharge lamp unit is mounted on a fluid sterilizer or the like.

The lighting device may be a device mainly composed of an inductor composed of a core and a coil, or a high-frequency inverter. By using a high-frequency inverter, the luminous efficiency of the lamp can be further increased.

In the present invention, since the low-pressure mercury vapor discharge lamp of the ultraviolet radiation type is housed in a protective tube made of a material transparent to ultraviolet light in a sealed manner, the low-pressure mercury vapor discharge lamp unit can be used as it is as the liquid to be treated. It can be used by being immersed in it.

Further, since the lighting device is provided in the holder, the lamp can be lighted only by connecting the low-pressure mercury vapor discharge lamp unit to the power supply, and the handling becomes easy.

Further, since the protective tube mechanically protects the discharge lamp, it is easy to handle and safe even if it is used so as not to be immersed in the liquid to be treated.

The fluid sterilizer according to the invention of claim 7 is a fluid sterilizer main body having a fluid inlet and a fluid outlet, and the low-pressure mercury according to claim 6, which is disposed sealed in the fluid sterilizer main body. And a vapor discharge lamp unit.

In the present invention, the fluid refers to a substance having fluidity such as a liquid, a gas, and a powder.

The main body of the fluid sterilizer is configured so that the fluid to be processed flows through the inside thereof.

The main body of the fluid sterilizer can be formed of a suitable material such as metal, synthetic resin, ceramics, glass, etc., but by making the inner surface ultraviolet-reflective, it is possible to effectively utilize ultraviolet light for sterilization. Efficiency can be increased.

In order to make the film reflective to ultraviolet light, the inner surface may be made of a material having a high ultraviolet reflectivity. A metal having a high ultraviolet reflectivity may be used for the inner surface, or the metal may be plated on the inner surface. In the case of a non-metal such as synthetic resin, ceramics, and glass, a thin metal plate having a large ultraviolet reflectance may be bent and disposed on the inner surface.

In the present invention, the means for sealing the main body of the fluid sterilizer and the low-pressure mercury vapor discharge lamp unit is not limited, but it is necessary to endure the pressure acting on the fluid and make the low-pressure mercury vapor discharge lamp unit detachable. In view of the above, it is preferable to use sealing means such as packing.

Thus, in the present invention, the low-pressure discharge lamp unit radiates the fluid to be treated from the fluid inlet to the inside of the fluid sterilization apparatus main body to the fluid outlet. Sterilized by irradiation with ultraviolet rays.

[0072]

Embodiments of the present invention will be described below with reference to the drawings.

FIG. 1 is a front view showing a first embodiment of an ultraviolet radiation type low pressure mercury vapor discharge lamp of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged sectional view of the main part.

In the figure, 1 is an airtight container, 2 is an electrode, 3
Is a sealing metal foil, 4 is a lead wire, 5 is a base, 6 is a lead wire, and 7 is a connector.

The airtight container 1 is made of transparent quartz glass,
Discharge space 1a, pinch seal 1b, exhaust tip 1
c and a protective film 1d.

The discharge space 1a is formed by bending a straight tube having an outer diameter of 6 mm and an inner space length of 300 mm into a U-shape, and has a total width of 18 mm.
mm, and the total length is 152 mm. That is, two straight portions 1a1 and 1a1 and a bent portion 1a2 are provided.

The pinch seals 1b, 1b are formed at both ends of the discharge space 1a, and have a decentered plane. The deflected planes of the pinch seal portions 1b, 1b are aligned parallel to each other.

The exhaust tip portion 1c is formed in a straight portion 1a1 separated from the tip of the bent portion 1a2 of the airtight container 1 by 50 mm.

The protective film 1 d is formed by depositing fine particles of alumina, and is formed on the main portion of the inner surface of the discharge space 1 a of the hermetic container 1. The main part refers to a discharge space between the distal ends of the electrodes 2 described below.

The electrode 2 comprises an electrode main portion 2a and an electrode shaft 2
b, and are sealed at both ends in the airtight container 1.

The electrode main part 2a is of a cold cathode type, and is composed of a tungsten coil wound twice around the tip of the electrode shaft 2b and an electron emitting material applied to the coil.

The electrode shaft 2b is made of a tungsten rod, and its base end is embedded in the pinch seal portion 1b.

The sealing metal foil 3 is made of molybdenum foil,
Since the airtight container 1 is airtightly embedded in the pinch seal portion 1b, the current is introduced into the electrode 2 while the airtight container 1 is kept airtight. The base end of the electrode shaft 2b is welded to one end of the sealing metal foil 3, and the sealing metal foil 3
A lead wire 4 is welded to the other end.

The hermetic container 1 is filled with mercury as a discharge medium and a rare gas consisting of 98% neon and 2% argon at a partial pressure ratio of 90 torr.

The base body 5 is formed by molding a fluororesin into a substantially cylindrical shape, and is formed at a lower end thereof with a rectangular hole for receiving the pinch seal portions 1b, 1b of the pair of hermetic containers 1 separated from each other. In addition, a lead wire 6 connected to the introduction wire 4 extends from the upper end of the base body 5. Further, a locking flange 5a having an outer diameter of 25.5 mm is formed on the outer periphery of the upper end of the base body 5. The pinch seal portions 1b, 1b are hermetically fixed to the base body 5 with a silicone adhesive.

The other end of the lead wire 6 is connected to a connector 7. The connector 7 is connected to a lighting device (not shown).

The ultraviolet radiation type low-pressure mercury vapor discharge lamp described above has a total length of 190 mm and a total width of 25.5 mm, which is the outer diameter of the flange 5 a of the base body 5.

When this discharge lamp was lit at a lighting frequency of 40 KHz using a high-frequency inverter as a lighting device, a lamp voltage of 500 V, a lamp current of 20 mA,
The lamp input was 10W. The UV output is 2.5
W.

FIG. 4 is a front view showing a second embodiment of the ultraviolet radiation type low pressure mercury vapor discharge lamp of the present invention.

FIG. 5 is a side view of the same.

In the figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

In this embodiment, a support 8 having the same outer shape as the base 5 'is mounted on the bent portion 1a2 of the airtight container 1. The support 8 has a screw hole 8a.

The lead wire 6 is covered with an insulating tube 6a made of silicone resin.

The low-pressure mercury vapor discharge lamp of the ultraviolet radiation type has a hermetic container having a total width of 18 mm, a total lamp length of 163 mm, and a total lamp width of 21 mm, which is the outer diameter of the base 5 '.

Therefore, in the case of the present embodiment, it can be housed in a protective tube having an inner diameter of 21 mm.

FIG. 6 is a front view showing a third embodiment of the ultraviolet radiation type low pressure mercury vapor discharge lamp of the present invention.

FIG. 7 is a side view of the same.

In this embodiment, the airtight container 1 "is composed of four straight portions 1a1" and three bent portions 1a2 ". Therefore, the outer diameter of the base 5" is relatively large. 1 and the discharge path length is about twice that of the first embodiment shown in FIG. 2, and the lamp input is 20 W and the ultraviolet output is 5 W.

FIG. 8 is a front view in central section showing one embodiment of the low-pressure mercury vapor discharge lamp unit of the present invention.

In the figure, the same parts as those in FIGS. 1 and 2 are denoted by the same reference numerals, and description thereof will be omitted.

That is, 9 is an ultraviolet radiation type low pressure mercury vapor discharge lamp, 10 is a protective tube, 11 is a holder, 12 is packing, 13 is a tightening ring, 14 is an O-ring, 15 is a cover, and 16 is a lighting device. is there.

The protection tube 10 is made of transparent quartz glass.
It has a bottomed cylindrical shape. The protective tube 10 houses the ultraviolet radiation type low-pressure mercury vapor discharge lamp 9 shown in FIGS. 1 and 2, and the opening end 10 a of the protective tube 10 is
Is hermetically sealed and fixed to the outer peripheral portion with a silicone adhesive.

The holder 11 is made of aluminum die-cast and has a hollow shape as a whole. The lower end is formed with a lower end opening 11a large enough to allow the protection tube 10 to pass through, and the upper end is passed through a tightening ring 13 described later. The fastening screw hole 11b of the size which can be performed is formed. The lower end opening 11a of the holder 11 and the fastening screw hole 11b communicate with each other inside,
Further, a tapered surface 11c is formed below the fastening screw hole 11b. Further, a peripheral groove 11d is formed in a lower portion of the outer peripheral surface of the holder 11, and a locking flange 1
1e is formed, and a support flange 11f is formed at the upper end.

The packing 12 has a ring shape with a wedge-shaped cross section, and is arranged on the tapered surface 11 c of the holder 11.

The tightening ring 13 has a peripheral step 13 on its lower inner surface.
a is formed, and a thread groove 13b is formed on the outer peripheral surface. The tightening ring 13 is attached to the base 5 from the hermetic container 1 side prior to storing the ultraviolet radiation type low-pressure mercury vapor discharge lamp 9 in the protective tube 10, and the flange 5 of the base 5 is provided.
a. After that, the protective tube 10 is
, The fastening ring 13 is prevented from falling.

After placing the packing 12 on the tapered surface 11c of the holder 11, the protective tube 10 is inserted into the packing 13, and the screw ring 13b of the tightening ring 13 is screwed into the screw hole 11b of the holder 11 for tightening. Then tightening ring 1
The lower part of 3 abuts on the upper end of packing 12 and presses downward. As a result, the packing 12 is pushed down along the tapered surface, so that the packing 12 is deformed and pressed against the tapered surface 11 c of the protective tube 10 and the holder 11. As a result, the protection tube 10 is sealed and attached to the holder 11.

The O-ring 14 is provided on the peripheral groove 11 d of the holder 11.
And a part thereof protrudes outward from the peripheral surface of the holder 11. The O-ring 14 functions as a seal when the low-pressure mercury vapor discharge lamp unit is sealed and mounted on the sterilizer main body.

The cover 15 is provided with a support flange 11f of the holder 11.
The lighting device 16 and a terminal block are accommodated therein.

FIG. 9 is a circuit diagram showing a high-frequency inverter in one embodiment of the low-pressure mercury vapor discharge lamp unit of the present invention.

In the figure, 9 is an ultraviolet radiation type low pressure mercury vapor discharge lamp, 17a and 17b are DC power terminals, 18
a and 18b are a pair of switching means, 19 is an output transformer, 20 is an inductor, 21 is a current fuse, 22 is a resonance capacitor, 23 is a ballast capacitor, 24
Is a high frequency output terminal.

[0113] DC power supply terminal 17a of the positive electrode side is connected to the midpoint of the primary winding 19 _P of the output transformer 19 through the current fuse 21 and an inductor 20 in series.

[0114] DC power supply terminal 17b on the negative electrode side is connected to both ends of the primary winding 19 _P, respectively via a pair of switching means 18a, 18b output transformer 19.

Transistors are used as the switching means 18a and 18b, and their control poles or bases are
Each is connected to the DC power supply terminal 17a on the positive electrode side via a starting resistor _RS .

[0116] 3 winding 19 _T of the output transformer 19 is connected to the switching means 18a, 18b of the control electrode.

The resonance capacitor 22 is connected to the output transformer 1
It is connected to both ends of the primary winding 19 _P 9.

Both ends of the secondary winding 19 _S of the output transformer 19 are connected to a high-frequency output terminal 24 via a ballast capacitor 23 in series. Further, the secondary winding 19 at one end of the _S of the DC power source terminal 17b and the output transformer 19 on the negative electrode side are connected conductively.

The high-frequency inverter described above constitutes a so-called parallel inverter, and the switching means 1
By alternately turning on and off 8a and 18b, a sine-wave high-frequency AC voltage can be obtained between the high-frequency output terminals 24.

Then, since the high frequency voltage is applied between the electrodes 2 and 2 of the ultraviolet radiation type low pressure mercury vapor discharge lamp 9 via the ballast capacitor 23, the lamp 9 is turned on at a high frequency to generate ultraviolet rays. I do.

FIG. 10 is a partial front sectional view showing an embodiment of the fluid sterilizer of the present invention.

In the figure, the same parts as those in FIG. 8 are denoted by the same reference numerals, and description thereof will be omitted.

Reference numeral 25 denotes a fluid sterilizer main body, and reference numeral 26 denotes a low-pressure mercury vapor discharge lamp unit.

The fluid sterilizer main body 25 is manufactured by molding a synthetic resin.
b, a fluid outlet 25c and an ultraviolet reflector 25d.

The lower end of the tubular portion 25a is closed by a bottom plate 25a1, and an opening 25a2 is formed at the upper end.

A guide portion 25a3 of the protection tube 10 is formed on the bottom plate portion 25a1 so as to protrude from the inner surface.

The fluid inlet 25b is provided near the lower end of the cylindrical portion 25a.

The fluid outlet 25c is arranged near the upper end of the cylindrical portion 25a.

Thus, the fluid to be sterilized flows through the inside of the fluid sterilization apparatus main body 25.

The ultraviolet reflector 25d is formed by bending an aluminum thin plate and mounting it on the inner surface of the cylindrical portion 25a.

The low-pressure mercury vapor discharge lamp unit 26 comprises:
The locking collar 1 of the holder 11 is the same as that shown in FIG.
1e is fitted on the opening 25a2 of the fluid sterilization apparatus main body 25 in a state where it is locked to the fluid in a state of being locked. The sealing is performed by the O-ring 14 mounted on the peripheral surface of the holder 11 being pressed against the inner surface of the opening 25a2.

Thus, while the fluid to be sterilized, eg, water, flows in through the fluid inlet 25b, rises in the cylindrical portion 25a, and flows out of the fluid outlet 25c, it is emitted from the low-pressure mercury vapor discharge lamp 9. Ultraviolet rays pass through the protective tube 10 and irradiate the fluid, whereby the fluid is sterilized, and the sterilized fluid can be obtained from the fluid outlet 25c. UV reflector 2
5d reflects the incident ultraviolet rays and can be used again for sterilization, so that the sterilization efficiency is improved.

[0133]

According to the first to fifth aspects of the present invention, it is possible to provide an ultraviolet radiation type low-pressure mercury vapor discharge lamp having a compact size and an increased ultraviolet output.

According to the first aspect of the present invention, in addition to the above, an outer diameter of 3 to
By using an airtight container made of a UV-transmitting material having a bent discharge path with a total width of less than 12 mm and a width of less than 30 mm, a UV radiation type low-pressure mercury vapor discharge lamp having an increased UV input and an increased UV output can be provided. .

According to the second aspect of the present invention, in addition, the pair of pinch seals formed at both ends of the quartz glass hermetic container are made substantially parallel to each other so that the entire width can be minimized. An ultraviolet radiation type low-pressure mercury vapor discharge lamp having a compact size can be provided.

According to the third aspect of the present invention, in addition, the inner diameter is 2 to 2.
A protective film is formed on the inner surface of a 10 mm quartz glass hermetic container, and a rare gas containing 50% or more of neon is sealed, so that the luminous efficiency is high and the consumption of mercury due to the impact of mercury ions is small. A radial low-pressure mercury vapor discharge lamp can be provided.

According to the fourth aspect of the present invention, an ultraviolet radiation type low-pressure mercury vapor discharge lamp can be provided in which an exhaust chip is disposed in a straight portion, so that damage to an airtight container due to strain is reduced. it can.

According to the fifth aspect of the present invention, in addition to the provision of the UV-resistant cap which integrally supports both ends of the hermetic container, it is easy to support the wiring to the electrode of the lamp and the lamp. In addition, it is possible to provide an ultraviolet radiation type low-pressure mercury vapor discharge lamp that can easily form a low-pressure mercury vapor discharge lamp unit in which a protective tube is sealed and mounted.

According to the invention of claim 6, a low-pressure mercury vapor discharge lamp unit having the effects of claims 1 to 5 can be provided.

According to the seventh aspect of the present invention, it is possible to provide a fluid sterilizer having the effects of the first to fifth aspects.

[Brief description of the drawings]

FIG. 1 is a front view showing a first embodiment of an ultraviolet radiation type mercury vapor discharge lamp of the present invention.

FIG. 2 is a side view of the same.

FIG. 3 is an enlarged sectional view of a main part of the same.

FIG. 4 is a front view showing a second embodiment of the ultraviolet radiation type mercury vapor discharge lamp of the present invention.

FIG. 5 is a side view of the same.

FIG. 6 is a front view showing a third embodiment of the ultraviolet radiation type mercury vapor discharge lamp of the present invention.

FIG. 7 is a side view of the same.

FIG. 8 is a central sectional front view showing one embodiment of the low-pressure mercury vapor discharge lamp unit of the present invention.

FIG. 9 is a circuit diagram showing a high-frequency inverter in one embodiment of the low-pressure mercury vapor discharge lamp unit of the present invention.

FIG. 10 is a partial front sectional view showing one embodiment of the fluid sterilization apparatus of the present invention.

[Explanation of symbols]

 DESCRIPTION OF SYMBOLS 1 ... Airtight container 1a ... Discharge space part 1a1 ... Linear part 1a2 ... Bent part 1b ... Pinch seal part 1c ... Exhaust chip part 2 ... Electrode 2a ... Electrode main part 2b ... Electrode shaft 5 ... Base body 6 ... Lead wire 7 ... Connector

──────────────────────────────────────────────────の Continued on the front page (51) Int.Cl. ⁶ Identification code FI H01J 61/20 H01J 61/20 L 61/35 61/35 K 61/36 61/36 A

Claims (7)

[Claims] 1. An outer diameter of 3 to 12 mm including a bent portion and a straight portion and capable of forming a bent discharge path therein, and having an overall width of 3 mm.
An airtight container made of an ultraviolet-transmissive material of less than 0 mm; a pair of electrodes sealed at both ends in the airtight container; and a discharge medium containing mercury and a rare gas sealed in the airtight container. Features a low-pressure mercury vapor discharge lamp of the ultraviolet radiation type. 2. An airtight container made of quartz glass, comprising a pair of pinch seals which include a bent portion and a straight portion, can form a bent discharge path therein, and have a pair of pinch seals at both ends thereof, which are substantially parallel to each other. And a pair of electrodes sealed at both ends in a hermetic container via a pinch seal portion; and a discharge medium containing mercury and a rare gas sealed in the hermetic container. Radial low-pressure mercury vapor discharge lamp. 3. An inner diameter including a bent portion and a straight portion, capable of forming a bent discharge path therein, having a pair of pinch seal portions at both ends, and forming a protective film made of metal oxide fine particles on the inner surface. An airtight container made of quartz glass of 2 to 10 mm; a pair of electrodes sealed at both ends in the airtight container via a pinch seal; and a rare gas containing 50% or more of mercury and neon sealed in the airtight container. Including a discharge medium;
An ultraviolet radiation type low pressure mercury vapor discharge lamp characterized by comprising: 4. The ultraviolet radiation type low-pressure mercury vapor discharge lamp according to claim 1, further comprising an exhaust chip disposed in the linear portion. 5. The apparatus according to claim 1, further comprising an ultraviolet-resistant cap for integrally supporting both ends of the airtight container.
5. A low-pressure mercury vapor discharge lamp of the ultraviolet radiation type according to any one of claims 4 to 4. 6. An ultraviolet radiation type low-pressure mercury vapor discharge lamp according to claim 5, wherein said low-pressure mercury vapor discharge lamp is housed in said interior and said opening end is sealed with a base to protect an ultraviolet-permeable material. A low-pressure mercury vapor discharge lamp unit, comprising: a tube; a holder for sealingly supporting an open end of the protective tube; and a lighting device for a low-pressure mercury vapor discharge lamp provided in the holder. 7. A fluid sterilizer main body having a fluid inlet and a fluid outlet, and a low-pressure mercury vapor discharge lamp unit according to claim 6, which is disposed sealed in the fluid sterilizer main body. A fluid sterilization device characterized by the following.