JP2002110101A - Multiplex tube discharge lamp and photochemical reaction apparatus - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multiplex tube discharge lamp and a photochemical reaction apparatus which prevent cracking on a valve of an arc tube and breaking of a near-by wire by impacts caursed by the nearby conductor when it abuts the valve and also deterioration of starting characteristic with a simple structure. SOLUTION: This multivalve type discharge lamp L comprises: a long size arc tube 4 consisting of a ceramics-valve 41 sealing electrodes 44a, 44b at an upper and a bottom ends; a supporting member 7A made of an electrical insulating material and arranged adjacently along the valve 41 in the outside of the arc tube 4; a nearby conductor 6, which is supported at a plurality of points along the external face of the supporting member 7A, having a line-form of which the one end is locked with insulation at one end of the arc tube 4 and the other end is electrically connected to the electrode 44b at the other end of the arc tube 4; and an envelope 1 containing the arc tube 4, an electric feeder, a supporting member 7A and the nearby conductor 6, in addition, fixing an electric feeder at an end. Also, the photochemical reaction apparatus 8 using the lamp L as a light source is provided.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a multi-tube high-pressure metal vapor discharge lamp having a long arc tube and a photochemical reaction apparatus using the discharge lamp, which is mainly used for industrial purposes such as photochemical reactions. .

[0002]

2. Description of the Related Art The arc tube of a high-pressure metal vapor discharge lamp is made of alumina (Al ₂ O 3) having excellent heat resistance, pressure resistance and corrosion resistance.
A light-transmitting material made of ceramics such as O ₃ ) is used as a bulb, and electrodes are sealed at both ends. The arc tube is filled with mercury, a luminous metal, or the like, which evaporates during lighting and has a predetermined lamp voltage, and an inert gas such as argon or xenon for facilitating starting.

In addition, this type of discharge lamp requires an envelope to keep the arc tube warm, to prevent oxidation of metallic materials, and to block harmful ultraviolet rays. The interior of the envelope is vacuum or an inert gas containing nitrogen. The atmosphere is maintained, and the arc tube has a multi-tube structure in which the arc tube is accommodated in an outer tube.

[0004] One type of such a multi-tube high-pressure metal vapor discharge lamp is a discharge lamp that emits visible light, ultraviolet light, or the like having a specific wavelength used as a light source for a photochemical reaction device or the like.

This is because light of a specific wavelength promotes a specific photochemical reaction. In a photochemical reaction apparatus, a high-pressure metal vapor as a light source is placed in a reaction tank main body containing a reaction solution. The discharge lamp is immersed, and the reaction liquid is chemically reacted by light emitted from the discharge lamp.

The discharge lamp for this kind of application has a hermetically sealed multi-layer structure in which an arc tube is housed in a long cylindrical outer envelope made of quartz glass or hard glass. And the reaction solution is prevented from entering the outer tube. The main body of the reaction tank is deepened to increase the reaction efficiency, and accordingly, a discharge lamp having a large emission length is required. Therefore, the length of the surrounding tube is several tens cm.
And several m, and the power is increased to a level of 10 to several tens of kilowatts.

[0007] In such a high pressure metal vapor discharge lamp having a multiplex structure, a plurality of power supply terminals are protruded from one end sealing portion of the long cylindrical outer tube, and the inside of the outer tube is provided. Has a support member serving also as a power supply line connected to the power supply terminal arranged along the axial direction of the envelope. A holder supporting the arc tube is attached to these support members, and plate springs elastically contacting the inner surface of the outer tube are welded. The plate springs support the arc tube at the axial position of the outer tube. are doing.

In this high-pressure metal vapor discharge lamp, a voltage is applied to the electrodes provided at both ends of the arc tube to generate an arc discharge between the electrodes, and the heat of the arc discharge raises the temperature of the arc tube. . Due to the rise in the temperature of the arc tube, a luminous metal such as mercury and a halide therein evaporates, and the metal atom emits light in a spectrum peculiar to the element. The lamp characteristics change due to the evaporation of the luminescent metal. However, when the temperature of the coldest part stops rising and there is no change in the temperature, the vapor pressure becomes constant and the characteristics become stable.

However, as described above, the discharge lamp used in the photochemical reaction device is as long as several meters, so that the distance between the electrodes is large, and an inert gas such as xenon is charged to increase the lamp efficiency. In the case of a discharge lamp with a high pressure, the voltage applied to both electrodes at the time of starting requires a high voltage of 7 to 8 KV or more, which requires a special power supply, which is expensive and requires extra care in terms of safety. there were.

Therefore, in order to facilitate the starting, a proximity conductor connected to the other electrode is arranged near the outer surface of the arc tube bulb provided with the one electrode. An arc discharge is first generated between adjacent conductors, and the arc discharge is shifted so as to occur between one electrode and the other electrode.

For example, in the case of a long high-pressure sodium lamp which is lit vertically, a near conductor made of a molybdenum wire or a tungsten wire having substantially the same size as the length of the arc tube is provided substantially parallel along the outer surface of the arc tube made of alumina. Is added, it is possible to lower the discharge starting voltage, and the starting can be facilitated.

The temperature of the arc tube becomes 1100 ° C. to 1200 ° C. due to arc discharge, and when a nearby conductor shakes due to vibration or shock applied to the arc tube and comes into contact with the arc tube bulb, a temperature difference occurs. Cracks may occur in the arc tube bulb due to thermal shock or abrasion of alumina due to repeated contact of adjacent conductors. For this reason, attempts have been made to reduce the temperature difference and reduce the impact by reducing the wire diameter of the adjacent conductor, but when the wire is made thinner, the strength becomes weaker and the wire may be broken.

In addition, the luminous bulb and the adjacent conductor, which become high in temperature at the time of lighting as described above, undergo a thermal expansion and the overall length is elongated. There is no problem if the expansion and contraction dimensions of the luminous bulb and the nearby conductor are the same. The metal wire attached along with the arc tube under tension is elongated due to the thermal effect from the arc tube and becomes longer than the original size when turned off. Was increasing.

[0014] The elongate and relaxed adjacent conductor contacts the arc tube made of alumina which is higher in temperature than this conductor during lighting, or has a very small heat capacity compared to the arc tube immediately after the lamp is turned off, and has a small cooling capacity. When the fast proximity conductor came into contact with the arc tube still in a high temperature state, cracks sometimes occurred in the arc tube made of alumina due to thermal shock.

Therefore, in order to eliminate the possibility of occurrence of the above-mentioned problems, for example, as described in JP-A-63-136458, the proximity conductor is brought into contact with or close to the bulb of the arc tube at the start of discharge. After starting, the bimetal is deformed by the heat of the arc tube so that the bimetal is separated from the bulb of the arc tube.
As described in Japanese Patent Application No. 01307 (Japanese Patent Application No. 6-291100), means such as providing a conductor expansion / contraction adjustment device capable of expanding and contracting a nearby conductor in response to expansion and contraction of an arc tube can be considered.
It has also been partially executed.

However, in the former means using a bimetal, the bimetal must be specially prepared, and a mechanism capable of operating smoothly must be sealed in the outer tube. There was a problem that the configuration became complicated.

Further, in the discharge lamp provided with the latter conductor expansion / contraction adjusting device, the contact of the adjacent conductor at the portion along the arc tube can be prevented. However, it is difficult to design the device, and the configuration of the device is difficult. However, there has been a problem that the device is complicated, requires a space, and is easily damaged during transportation of the discharge lamp.

[0018]

Therefore, the present inventors have previously filed an application for covering an insulator tube made of an electrical insulator such as alumina or quartz glass over almost the entire surface except for both ends of the adjacent conductor along the arc tube. .

However, in this case, the proximity conductor is covered with an electrically insulating porcelain tube, and the proximity conductor made of a metal wire evaporates at a high temperature, and the evaporated matter adheres to the inner surface of the porcelain tube. There is a problem that electric field concentration is hardly caused by the blackened coating and the discharge is hindered, and there is a possibility that the starting characteristics may be deteriorated.

The problem to be solved by the present invention is that a high-pressure discharge lamp, such as for a photochemical reaction, in which a proximity conductor for starting is disposed near the outer surface of a long arc tube bulb,
The proximity conductor that has been extended due to the temperature rise may come into contact with the arc tube bulb, causing a thermal shock to the arc bulb or damaging the bulb by vibration or impact, which may cause cracks in the arc bulb. This means that the adjacent conductor is disconnected, and that the starting characteristics may be degraded.

According to the present invention, a multi-tube discharge lamp having a simple structure, good starting characteristics, and a photochemical reaction is provided. It is intended to provide a device.

[0022]

According to a first aspect of the present invention, there is provided a multi-tube discharge lamp comprising: a long arc tube having ceramic bulbs each having an upper and lower end provided with electrodes; A power supply member connected to the electrodes, a long support member made of an electrical insulator, which is arranged outside the arc tube along the bulb of the arc tube, and a plurality of members extending along the outer surface of the support member. Supported at a location, one end side is insulated and locked to one end side of the arc tube, the other end side is electrically connected to the electrode at the other end side of the arc tube, and is separated from the arc tube bulb. It is characterized by comprising an arranged linear proximity conductor, and an outer tube that accommodates the light emitting tube, the power supply member, the support member, and the proximity conductor, and has a power supply portion at one end.

[0023] Since the adjacent conductors are fixed and fixed at short intervals to a long support member made of an electrical insulator disposed close to and along the bulb of the arc tube, the temperature increases when the arc tube is turned on. The absolute length of the extension in each locking section is short even if it is extended by thermal expansion, it does not come loose and does not come into contact with the outer surface of the arc tube, and can prevent damage due to thermal shock and repeated contact. No cracks occur in In addition, the accumulation of elongation of the nearby conductor due to repeated blinking of the discharge lamp is slight,
There is no occurrence of the above problems.

Further, since the small-diameter proximity conductor is held by a supporting member which is more rigid than this conductor, it is strong against vibration and impact and does not break.

The distance between the adjacent conductors is 60 cm.
Since the elongation dimension increases as the distance increases, the distance may be determined according to the total length and the wire diameter of the adjacent conductor, and preferably about 30 to 50 cm.

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

The multi-tube type discharge lamp of the present invention has a middle tube surrounding the arc tube, a triple tube structure having an outer tube covering the middle tube, and a double tube structure in which the outer tube directly surrounds the arc tube. It is applicable even if it is.

It is preferable that the proximity conductor is as close as possible to an electrode of another polarity in the arc tube bulb.
It may be along the outside of the support member exposed over the entire length, or a part of the support member may be located inside the support member, and a part may be embedded in the support member for locking. .

The power supply member in the present invention is a general term for a power supply body, a power supply line, a lead wire, and the like provided in a middle tube or an outer tube for supplying power to the electrodes.

The multi-tube discharge lamp according to a second aspect of the present invention is characterized in that the proximity conductor is made of a high melting point metal wire having a wire diameter of 0.05 to 2.0 mm.

If the wire diameter of the adjacent conductor is less than 0.05 mm, there is a problem that the strength against vibration and impact is low, the wire is easily broken, and the connecting work is difficult.

When the wire diameter exceeds 2.0 mm, the strength against vibration and impact increases, but light shielding and heat absorption due to the wire diameter are hard to ignore, and the wire diameter is preferably about 0.08 to 1.5 mm. It was good.

The cross-sectional shape of the proximity conductor may be a circle such as a perfect circle or an oval, a polygon such as a square or a rectangle, or a foil.

The proximity conductor is made of tungsten, rhenium, molybdenum, tantalum, or a material mainly containing tungsten, rhenium, molybdenum, or tantalum, which has high heat resistance, corrosion resistance, and tensile strength, and is less likely to be disconnected even when the diameter is reduced in consideration of light shielding. A high melting point metal such as an alloy can be used.

Further, alumina (Al) is formed on the surface of the adjacent conductor.
₂ O ₃ ), titania (TiO ₂ ), zirconia (ZrO
By forming a film of a metal oxide having a high light reflectance such as ₂ ) or silica (SiO ₂ ), it is possible to suppress the temperature rise of the nearby conductor. This is because when the discharge lamp is turned on, the nearby conductor receives heat radiation from the arc tube, but the surface is covered with a metal oxide film, which reflects and reduces the temperature rise of the nearby conductor itself, and recrystallization. This can prevent brittle rupture due to the above, and can prevent disconnection of the adjacent conductor.

A multi-tube discharge lamp according to a third aspect of the present invention is characterized in that the proximity conductor is supported on the support member by winding or another member.

The long supporting member made of an electric insulator is made of ceramics such as quartz glass or alumina (transparent is preferable without loss of light, but may be translucent).
Consisting of a plurality of through-holes or notches formed in the support member, and winding or hooking the proximity conductor to stop and fix the proximity conductor, or the proximity conductor to a plurality of metal anchors embedded in the support member. The connection is fixed by welding or brazing.

Since the distance between the locking portions and the connecting portions is short and many, the proximity conductor can be reliably and firmly supported without being detached by its own weight. Can be suppressed.

A multi-tube discharge lamp according to a fourth aspect of the present invention is characterized in that the support member is provided with a switch for opening the electrical connection between the adjacent conductor and the electrode after starting.

After the discharge is started, the arc tube expands due to thermal expansion, and the supporting member is pulled and moves following the expansion, and the movement causes the contact points of the switch connected to the adjacent conductor to be opened and the proximity member to be opened. The current to the conductor is cut off.

This starting conductor is required only at the time of starting the discharge lamp, and does not need to be energized during the lighting of the lamp when it has finished its function. After the light is turned off, the size of the arc tube returns to its original size by cooling, and the contact of the switch can be brought into contact again to establish conduction, thus preparing for the next start of lighting.

Since the electric circuit to the adjacent conductor of the support member can be cut off, an effect of preventing the generation of an uneven electric field and the like is achieved.

A multi-tube discharge lamp according to a fifth aspect of the present invention is characterized in that the arc tube has a total length of 25 cm or more and is housed in an outer tube via a middle tube.

A discharge lamp having a long arc tube having a large length of 25 cm or more, particularly a discharge lamp having a large difference in expansion and contraction due to a thermal effect at the time of vertical lighting and blinking, has the same effect as described in the above-mentioned claims 1 to 4. .

In the case where the arc tube is surrounded by at least a single middle tube, the same effects as those of the first and second aspects are exhibited. The middle tube referred to in the present invention is also included in the category of the envelope surrounding the arc tube.

A photochemical reaction device according to a sixth aspect of the present invention is connected to the multi-tube discharge lamp according to any one of the first to fifth aspects and to the multi-tube discharge lamp. And a reaction vessel main body accommodating the multi-tube discharge lamp.

As the photochemical reaction device, there are provided a discharge lamp having the functions described in the first to fifth aspects and a lighting device which can be lit easily and at a low voltage by using a normal lighting circuit. Therefore, a predetermined chemical reaction can be obtained with less accidents caused by the discharge lamp.

[0048]

Embodiments of the present invention will be described below with reference to the drawings. FIGS. 1 to 5 show a multi-tube high-pressure metal vapor discharge lamp L for high-output visible light emission used in vertical lighting as a light source for photochemical reactions according to the present invention, and FIG. FIG. 2 is a schematic side view of FIG. 1, and FIG. 3 is a schematic view of an arrow A- in FIG. 1.
FIG. 4 is a cross-sectional view of a portion cut along line A, FIG. 4 is a schematic front view in which a part of the arc tube and the middle tube in FIGS. 1 and 2 are cut away, and FIG. It is a partially cut-away enlarged front view of the support member which supported the conductor.

In the figure, reference numeral 1 denotes a long cylindrical outer tube made of hard glass, which has a semicircular shape having a closed lower end and is sealed at the upper end. Active gas is enclosed. Reference numeral 3 denotes sealing portions 31 and 3 at both ends supported in the outer tube 1 via support members 2A and 2B.
1 is a cylindrical middle tube made of quartz glass or hard glass. Reference numeral 4 denotes a support member 5
An arc tube whose both ends are supported via A and 5B.

The surrounding tube 1 has a pair of power supply pins 12a and 12b serving as power supply parts outside the sealing portion 11, and a power supply body serving also as a pair of supports connected to the power supply pins 12a and 12b inside. 13a, 13b and the power supply bodies 13a, 13b
And insulators 14a and 14b attached to the distal end of the slab, and guide rods 15a and 15b made of metal wires attached to the insulators 14a and 14b.

The support members 2A and 2B are formed of a band 21 or a disk 22 made of a metal plate and a metal wire 23,
, Etc., and are attached so as to surround each end of the middle tube 3. The support members 2 </ b> A, 2 </ b> B Fix the middle tube 3 to the outer tube 1 by passing and fixing the wires 16L and 16R.
And is supported on the center axis of the shaft. The band 21a attached to the outer periphery of the middle portion of the middle tube 3 is
L and 16R are held via an insulating tube 19.

At this time, the disk 22 of the lower support member 2B is provided with a U-shaped spring body 25 which elastically contacts the inner surface of the closed bottom wall of the envelope 1. The upper and lower support members 2A and 2B or the feeder lines 16L and 16R have a plurality of substantially bow-shaped springs in which bent portions and protrusions 27,... Are provided to protect the center ring of the middle tube 3 and the luminous tube 4 and the middle tube 3 from vibration, impact, and thermal expansion and contraction.

The disk 22 of the support member 2A above the middle tube 3 has two hollow sliding tubes 28a and 28
The guide rods 15a and 15b are inserted into the sliding tubes 28a and 28b.

The electrical connection of the lamp L is as follows. The power supply pins 12a, 12
a long and short power feeder 13 which also serves as a pair of supports connected to b
a, 13b and flexible lead wires 17a, 17b attached to the distal ends of the power supply bodies 13a, 13b. One of the lead wires 17b is led out from the upper sealing portion 31 of the middle tube 3. It is connected to flexible lead wires 35, 35.

The other lead 17b is divided into two,
The power supply lines 16 </ b> L and 16 </ b> R are disposed at symmetric positions in the envelope 1 and extend downward.
The other ends of the power supply lines 16L and 16R are connected to the lower sealing portion 31 of the middle tube 3 via the flexible lead wires 18L and 18R.
Is connected to the lead wire 35 derived from the above. Reference numeral 19 in the figure denotes an insulating tube made of quartz glass or the like which covers the surfaces of the power supply lines 16L and 16R and the power supply body 13a for electrical insulation.

The middle tube 3 has stems 32a and 32b sealed at both ends as shown in FIG.
Support rods 34a, 34a, 34 made of a pair of metal wires fixed by bands 33, 33 respectively are provided on 2a, 32b.
b, 34b (note that in FIG. 4, the support rods 34a, 34a
And 34b, 34b each have one support rod 34.
It is not shown because it is located behind a, 34b. ) Is provided.

The support rods 34a, 34a and 34
b, 34b support member 5 holding arc tube 4 at the tip
A and 5B are attached.

The flexible lead wires 35, 35 extending outward from the upper stem 32a are connected to the lead wires 17a.
And the flexible lead wires 36, 36 extending inward are electrically connected to the support member 5A. In addition, flexible lead wires 35, 35 extending outward from the lower stem 32b are connected to the power supply lines 16L, 16R, and flexible lead wires 36, 36 extending inward. Are electrically connected to the port member 5B.

In the drawing, reference numerals 37, 37,... Denote intermediate support members provided with a spring body formed of a metal plate so as to be in elastic contact with the inner wall of the middle tube 3, and are provided at a plurality of positions on the support rods 34a, 34b at predetermined intervals. Fixed. Are getters attached to the lead wires 36, 36 to keep the inside of the middle tube 3 at a high vacuum.

As shown in FIG. 4 and FIG. 5, the light-emitting tube 4 is air-tightly closed at both ends of a light-transmitting bulb 41 made of alumina Al2 O3 or the like with end caps 42 made of niobium. . Reference numeral 43 denotes a thin tube which also serves as an exhaust pipe air-tightly joined to the end cap 42, and has shafts 45a and 45b of electrodes 44a and 44b fixed thereto, respectively. Further, a predetermined amount of sodium and mercury and a xenon gas for starting assistance are sealed in the valve 41.

The arc tube 4 is supported in the middle tube 3 by the support members 5A and 5B cut out from a metal plate and is electrically connected. That is, the support members 5A and 5B have cylindrical covers 52a and 52b formed by welding a pair of semicircular cover members having a flange portion 51 around the periphery thereof at the edge portions, and a pair of cover members having a concave portion at the center. U-shaped holding members 53, 53 (one is not shown because it is at the rear), and a locking piece 54 formed by cutting or raising the flange portion 51 or separately forming an L-shape with a metal plate. Bands 55 and 5 connected to stop piece 54
5 (one is not shown because it is at the rear).

The support members 5A and 5B are formed by sandwiching the thin tube 43 of the arc tube 4 with a pair of holding members 53, and holding the end of the holding member 53 with the semicircular cover body 52a. Are sandwiched between the edge portions 56,..., 52b, and the overlapped portions are fixed by welding.

The end of the bulb 41 of the arc tube 4 is connected to the above band 55, via heat-resistant alumina wool or the like.
The band 55 is wound and fixed to the valve 41 by screwing the edges of the bands 55, 55 to be integrated therewith.

Further, two hollow sliding tubes 5 are provided on the flange portion 51 of the cover body 52a of the upper support member 5A.
7, 57 (one not shown because it is at the rear)
Are fixed in the sliding tubes 57, 57. Support rods 34a, 34a supported by the upper stem 32a are provided in the sliding tubes 57, 57.
Of the lower support member 5B
Is a support rod 34 supported by the lower stem 32b.
b, 34b.

That is, the arc tube 4 in the middle tube 3
It is supported by four upper and lower support rods 34a, 34a, 34b, 34b, and comes into contact with the inner wall of the middle tube 3 via a spring body or the like (not shown) provided around the support members 5A, 5B. Are supported almost on the central axis.

Further, a supporting member 7A having a proximity conductor 6 which is at the same potential as the lower electrode 44b side is arranged in parallel with the outer surface of the bulb 41 of the arc tube 4 and along the axis of the bulb 41. I have. The support member 7A is made of a quartz glass rod or tube made of an electric insulator, and here an empty rod 71. Locking lines 72, 72 are provided on upper and lower end surfaces, and an intermediate portion along a straight long axis. A predetermined interval on the side, for example, about 40c
A plurality of anchors 73 consisting of metal wires having a wire diameter of about 0.8 mm are implanted substantially linearly at intervals of m, and the adjacent conductor 6 is welded to the tip of each anchor 73. The connection is maintained by means such as brazing.

The proximity conductor 6 has a circular cross section having a wire diameter of about 0.05 to 2.0 mm, here about 0.1 m.
A high melting point metal of about m, for example, a tungsten wire, a rhenium wire, a molybdenum wire, a tantalum wire or an alloy wire mainly composed of these, here, a flexible wire of a tungsten-rhenium alloy.

The support member 7A is connected to the proximity conductor 6
In the state of being close to the bulb 41 of the arc tube 4, the locking lines 72, 7 are attached to the flange portions 51 of the upper and lower support members 5A, 5B.
2 is connected and fixed by means such as welding.

At this time, the proximity conductor 6 is connected to the valve 41.
Extending preferably within 10 mm near the outer surface of
The distal end 61 is located near the upper electrode 44a, and the distal end 62 has a flange portion 51, a holding member 53 and a cover 52b which constitute a support member 5B having the same polarity as the lower electrode 44b. 51, which is connected to the lower electrode 44b by electrical means such as welding or screwing. The looseness of the proximity conductor 6 on the lower end side may be reduced.

In the above description, the upper cylindrical cover 52
The reason why “a” has a longer vertical dimension than the lower cylindrical cover 52b is to keep the upper tube end of the arc tube 4 warm, and the upper and lower covers 52a and 52b may have the same size. , The cover is not essential.

The discharge lamp L having such a configuration is shown in FIG.
It is incorporated and used in a photochemical reaction device, a part of which is shown in FIG. FIG. 6 is a longitudinal section showing a part of the embodiment of the photochemical reaction device 8 of the present invention. In the figure, reference numeral 81 denotes a photochemical reaction tank main body, and the discharge lamp L is immersed in the reaction liquid 82 of the reaction tank main body 81 in a state where the sealing portion 11 side is up, that is, in a vertical state. In the figure, reference numeral 83 denotes packing.

Next, the operation of the photochemical reaction device 8 will be described.

The discharge lamp L is connected to an output 91 of a lighting circuit of a lighting device 9 having a step-up transformer, a ballast, and the like as shown in FIG. That is,
When a voltage is applied to the power supply pins 12a and 12b via the lighting device 9, the power supply pin 12a-the power supply 13a-the lead wire 17a-the lead wires 35 and 36 of the middle tube 3 are applied to the upper electrode 44a.
-Nipping member 53 of support member 5A -Narrow tube 4 of arc tube 4
3-electrode shaft 45a-electrode 44a, and lower electrode 4
4b includes a power supply pin 12b, a power supply 13b, and a lead 17;
b-feed lines 16L, 16R-lead wires 35, 3 of the middle tube 3
6-Nipping member 53 of support member 5B-Narrow tube 43 of arc tube 4-Electrode shaft 45b-Electrode 44b and support member 5
Electricity is supplied to the flange 51 of FIG.

The current is discharged by the electrode 44 a having the closest conductor interval and the tip 61 of the adjacent conductor 6.
And an electrode 44b having the same potential as the proximity conductor 6
And finally the electrode 44a in the arc tube 4
Light emission of a predetermined wavelength is performed between the electrode and the electrode 44b, and the reaction liquid 82 can be irradiated with light to cause a photochemical reaction.

When the discharge lamp L is turned on, the discharge tube 4 is heated to a high temperature by the discharge heat, and the members in the middle tube 3 and the outer tube 1, ie, the support members 2A and 2 including the discharge tube 4 are provided.
B, 5A, 5B, the proximity conductor 6 and the like become high in temperature and thermally expand. Further, when the light is turned off, each member drops to the ambient temperature and almost returns to the original state.

In response to this thermal expansion and contraction at the time of turning off the light, the arc tube 4 is a guide in which hollow sliding tubes 57, 57 provided on the flange portion 51 of the support member 5A are supported by the stem 32 of the middle tube 3. The expansion and contraction can be absorbed by sliding on the rods 34a and 34a. The middle tube 3 is a support member 2A,
Hollow sliding tubes 28a and 28b provided on a 2B disc 22
By sliding on the guide rods 15a and 15b, the expansion and contraction can be absorbed. Further, the support members 2A, 2B,
5A, 5B, etc., the spring bodies 26, 26,... Are only in elastic contact with the inner wall of the tube, so that expansion and contraction in the tube axis direction and the radial direction can be easily performed by sliding.

When the discharge lamp L is turned on, the arc tube 4 and the proximity conductor 6 extend due to thermal expansion, and even if the total length of the proximity conductor 6 is the same as that of the related art, the present embodiment is not limited to this embodiment. According to this, the anchors 73 in which the adjacent conductors 6 are provided at short intervals, ...
, The absolute length of elongation in each locking section is short, and it does not loosen and does not come into contact with the outer surface of the bulb 41 of the arc tube 4, and cracks may occur in the bulb 41 due to thermal shock. Absent. Also, the accumulation of the extension of the proximity conductor 6 due to the repeated blinking of the discharge lamp L was extremely small, and the above-described problem did not occur.

FIGS. 8 and 9 (a) and 9 (b) are front views of another embodiment of the proximity conductor 6 and the supporting member according to the present invention. The same parts as those described above are denoted by the same reference numerals and description thereof will be omitted.

The supporting member 7B of the proximity conductor 6 shown in FIG.
A tube 71 made of quartz glass or ceramics or a hollow rod, here a tube 71, a plurality of through holes 74 at a predetermined interval in the middle,
Are formed, and the flexible adjacent conductor 6 is inserted in each of the through holes 74, and is locked to the tube 71 by using the through holes 74 by bending or connecting.

The support member 7B is disposed on the arc tube 4 by, for example, attaching a quartz glass tube 7 to a holding member 53 for holding and supporting the thin tubes 43 constituting the support members 5A and 5B.
This can be performed by holding the end of the first member.

Also in this case, the distal end side of the proximity conductor 6 is located near the upper electrode 44a and is fixed in the tube, and the intermediate portion is locked to the tube 71 at each through hole 74,. On the lower side, it passes through tube 71 and its end 62
Is connected to the holding member 53 constituting the lower support member 5B by means such as welding or screwing, and the lower electrode 44b
Electrically connected to the side.

The support member 7C shown in FIG.
The proximity conductor 6 is substantially linearly attached to the hollow surface of a ceramic such as quartz glass or alumina or the outer surface of the tube 71, and a plurality of metal wires 75,... Place the empty conductor 7 on the nearby conductor 6
The support member 7C is configured by being tied or wound around and fixed.

In this case, if grooves 76,... Are formed in advance on the outer surface of the empty rod 71 where the metal wires 75,... Are wound, fixing is easy and firm. Alternatively, the metal wires 75,... May be connected to the adjacent conductor 6 in advance by welding, brazing, or the like, and the metal wires 75,.

Further, the support member 7D shown in FIG.
Are connected to the short empty rods 71,... Made of a ceramic such as quartz glass or alumina through a connecting line 77 made of tungsten or molybdenum wire, and the connecting lines 77,.
Are fixed by means such as welding or brazing.

A support member 7D is formed by connecting and fixing the adjacent conductors 6 to each of the anchors 73,... As shown in FIG.

Then, FIGS. 8 and 9 (a),
In each of the support members 7B to 7D shown in (b), the proximity conductor 6 is locked and fixed at a relatively short interval similarly to the support member 7A. Even if is expanded by thermal expansion, the absolute length of the expansion in each locking section is short and does not come loose and contact the outer surface of the bulb 41 of the arc tube 4.

In the case where glass such as quartz glass is used as the support member, a metal wire can be embedded by softening the glass, but in the case of ceramic such as alumina, alumina (Al 2 O 3) -calcium oxide (CaO) or the like can be used. It can be formed by bonding and implanting with a heat-resistant adhesive.

Therefore, similarly to the embodiment of FIG. 5, the proximity conductor 6 does not loosen and does not come into contact with the bulb 41 of the arc tube 4, and there is no possibility that the bulb 41 will be cracked by thermal shock.

FIGS. 10 (a) and 10 (b) show another embodiment of the mounting structure of the support member to the arc tube according to the present invention. FIG. Is a schematic front view in the operating state after starting. In the drawings, the same parts as those in FIGS. 1 to 5 are denoted by the same reference numerals, and description thereof is omitted.

In FIG. 11A, the support member 5
For example, a through hole (not shown) is provided in a part of the flange portions 51, 51 constituting the A, 5B, and the support member 7B made of, for example, a quartz glass tube 71 is horizontally displaceable in the through hole. It is inserted so that displacement in the direction can be regulated. A stopper 78 is provided on the upper side of the glass tube 71. The stopper 78 is formed by winding a projection or band formed by processing the glass. The stopper 78 is engaged with the peripheral edge of the through hole of the upper flange portion 51. The tube 71 is prevented from falling.

Further, the proximity conductor 6 formed by winding and locking a plurality of positions on the support member 7B made of the quartz glass tube 71 is used.
Is welded or screwed to a metal band 79 wound and locked near the upper end 61 facing the upper electrode 44a and the lower end 62 near the lower end of the glass tube 71. It is connected by such means.

In the drawing, reference numeral 70 denotes a contact piece formed by cutting or raising the cover 52b or formed of a separate metal body.
9 together with the switch section, when the light is off (a)
In the state shown in the figure, the proximity conductor 6 is electrically connected to the lower electrode 44b and has the same potential.

The discharge lamp manufactured by enclosing the arc tube 4, the supporting member 7B, the proximity conductor 6 and the like having such a configuration, when energized through the lighting circuit, is connected to the upper end 61 of the proximity conductor 6 and the upper end 61. After generating a discharge between the side electrode 44a,
The transition is made between the two electrodes 44a and 44b, and the discharge is continued to show a predetermined light emitting state.

When this discharge is continued, the bulb 41 of the arc tube 4 thermally expands due to a rise in temperature, and is displaced in the axial direction of the bulb 41. When the bulb 41 extends, the stopper 78 of the glass tube 71 of the support member 7B inserted into the upper flange portion 51 comes into contact with the flange portion 51, and pushes up the support member 7B.

When the support member 7B is pushed up, the band 79 provided near the lower end of the support member 7B also rises and separates from the contact piece 70. That is, the state shown in FIG. 6B is reached, and the proximity conductor 6 which has the same potential as the lower electrode 44b is opened.

After the discharge lamp is turned off, the support member 7B, which has been pushed upward, descends as the arc tube 4 cools and contracts as the temperature of the bulb 41 decreases. The band 79 provided on the contact piece 70
And the lower electrode 44b and the adjacent conductor 6 are connected so as to have the same potential (FIG. 7A).

The bulb 41 of the arc tube 4 and the support member 7
B, there is a difference in the speed of thermal contraction, since the support member 7B inserted through the through hole of the flange portion 51 is vertically displaceable, so that the arc tube 4 and the support member 7B
Can be contracted without displacement.

As described above, during lighting of the discharge lamp, the proximity conductor 6
If no electric potential is applied to the electrode 44a, no unequal electric field is generated between the electrode 44a and the adjacent electrode 44a. , 44b does not cause uneven blackening due to the electrode material scattered little by little from the valve 4b.
1 can be kept high.

Further, in the related art, the electric current of the arc discharge during the lighting causes a force to act on the proximity conductor 6 by the electromagnetic force of Fleming's law, causing the proximity conductor 6 to vibrate and come into contact with the arc tube 4. However, as in the present invention, by releasing the potential during lighting, the proximity conductor 6 does not vibrate and the contact with the arc tube 4 can be avoided, and the arc tube 4 is damaged by contact and gives a thermal shock. Therefore, it is possible to prevent a problem that the arc tube 4 is damaged.

In the above-described embodiment, the switch section is constituted by the band 79 which moves up and down and the contact piece 70. However, the switch section is not limited to the one shown in the figure, and may have another structure.

Note that the present invention is not limited to the above embodiment. For example, the electrical connection of the linear proximity conductor attached to the arc tube is performed by connecting the support member 2A on the upper side of the arc tube 4 and the proximity conductor 6 so that they have the same potential, and connecting the support member holding the proximity conductor 6 to the arc tube. It may be provided separately from the bulb 41 so that the front end 61 faces the electrode 44b on the lower end side of the arc tube 4 and the support member is locked to the support member 2B.

Even in such a configuration, first, a discharge occurs between the electrode 44b on the lower end side where the conductors are closest to each other and the tip end 61 of the proximity conductor 6 due to energization at the time of starting. Moves to the electrode 44 a having the same potential as the proximity conductor 6, and finally the upper and lower electrodes 4 in the arc tube 4.
The light emission is continued between the electrode 4b and the electrode 44a, and a predetermined light emission characteristic is obtained.

That is, the proximity conductor that causes the electrodes and the discharge at the time of starting may be disposed to face either the upper or lower electrode.

The discharge lamp is not limited to a high-pressure sodium lamp, but may be a mercury lamp filled with mercury or a metal halide lamp filled with mercury and a halide. Alternatively, a discharge lamp for emitting visible light and ultraviolet light may be used.

The material of the bulb forming the arc tube is not limited to alumina but may be a translucent ceramic of another material, and the material of the bulb forming the surrounding tube and the middle tube is not limited to the embodiment. Alternatively, another glass material may be used.

Further, the structure and material of the proximity conductor are not limited to those in the embodiment, and the shape and material may be changed.

Further, the structure and material of the support member for supporting the arc tube and the like are not limited to those in the embodiment.
As the material of the metal member, niobium, stainless steel, nickel, or the like may be appropriately selected in consideration of heat resistance, corrosion resistance, and the like.

Further, according to the present invention, in a high-pressure discharge lamp which is vertically lit, the expansion and contraction difference is large due to the thermal effect at the time of blinking.
It is particularly suitable for a device having a long arc tube, and has a large effect when the arc tube length is 25 cm or more.

[0109]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A specific example in which the present invention is applied to a 50 KW high-pressure sodium lamp will be described. The external structure of the discharge lamp L is almost the same as that of the embodiment shown in FIGS. 1 to 5, and the arc tube 4 has a length of about 175 cm (luminous length of about 162 cm) and an outer diameter of about 5 cm. About 8.0 × 10 ^-6 cm / c
m / ° C.), and sodium and mercury and xenon gas are sealed inside. The middle tube 3 is made of quartz glass having a length of about 230 cm and an outer diameter of about 8 cm, and the inside is evacuated. Further, the outer tube 1 is made of hard glass having a length of about 290 cm and an outer diameter of about 13 cm, and nitrogen is sealed therein.

A distance of about 3 to 5 mm near the outer surface of the bulb 41 between the upper disk-shaped flange portion 51 and the lower disk-shaped flange portion 51 (about 168 cm in length) of the arc tube 4. The line diameter is approximately 0.1
mm and a length of about 168 cm, a flexible proximity conductor 6 made of a tungsten-rhenium alloy wire (coefficient of thermal expansion of about 6.0 × 10 ⁻⁶ cm / cm / ° C.) every 40 cm (5
A support member 7A made of a quartz glass tube having an outer diameter of about 6 mm (inner diameter of about 3 mm) fixed to the support member 7A is provided.

After the lamp has been lit for a total of about 16,000 hours in a normal use state (blinking vertically), the extension of the adjacent conductor 6 between the upper and lower anchors is about 2 mm on average.
(About 0.5% elongation).

The lamp was turned on, and contact with the arc tube 4 bulb 41 due to loosening of the proximity conductor 6 during and after lighting was investigated. However, no lamp was in contact, and therefore, the arc tube 4 bulb 41 due to thermal shock. No cracks or the like occurred. In addition, the starting voltage can be reduced, the lighting device can be inexpensive, and the safety can be improved.

Further, it has been found that the following additional effects can be obtained by using the configuration in which the adjacent conductors of the present invention are held at short intervals.

That is, this kind of long discharge lamp is a glass product, and the posture at the time of transportation or detention is horizontally fixed for safety. And, when the arc tube in the outer tube including the middle tube is horizontally installed, the long nearby conductor and the power supply line hang down by its own weight, and the nearby conductor and the power supply line swing due to vibration during transportation by a vehicle, In many cases, the amplitude in the downward direction is large, and may come into contact with the outer wall surface of the arc tube, the inner wall surface or the outer wall surface of the middle tube, or the inner wall surface of the outer tube. If this vibration continues continuously, repeated contact may result in disconnection of the nearby conductor, or scratches or cracks at the portion.

However, if the adjacent conductors are held at short intervals as in the present invention, their droop and amplitude are small, and the adjacent conductors may come into contact with the outer wall surface of the arc tube, the inner wall surface of the middle tube or the outer tube. And the phenomenon of damaging these tube walls does not occur.

Further, according to an experiment by the present inventors, the proximity conductor was extended within ± 45 degrees with respect to a horizontal plane from the center point of the two power supply lines extending horizontally. It has been found that if the discharge lamp is kept stationary in this state, it is possible to more reliably prevent the adjacent conductor from contacting.

[0117]

According to the first aspect of the present invention, the proximity conductor does not come into contact with the arc tube bulb regardless of the blinking state of the discharge lamp. Cracks and the like can be prevented from occurring in the pipe valve with a simple structure.

Further, since the entire surface of the proximity conductor is not covered with the insulator, the starting characteristics of the discharge lamp are good and the light distribution characteristics can be improved without disturbance of the electric field. In addition, since the small-diameter proximity conductor is held by a support member that is more rigid than this conductor, a multi-tube discharge lamp that is robust against vibration and impact can be provided.

According to the second aspect of the present invention, by limiting the wire diameter of the adjacent conductor, a multiplex wire having a practical advantage that it is resistant to vibration and impact and is less likely to be broken and that the connecting work is facilitated. A tubular discharge lamp can be provided.

According to the third aspect of the present invention, the long supporting member made of an electrically insulating material is preferably made of quartz glass or ceramics and has high transparency without loss of light. By locking or fixing the proximity conductor to the hole or the anchor, the same effect as described in the first and second aspects can be obtained.

According to the fourth aspect of the invention, when the discharge lamp is turned on, the potential of the adjacent conductor is released, thereby preventing blackening of the arc tube and electric field vibration of the adjacent conductor, and holding the arc tube. The force can be improved and the valve will not be damaged.

According to the fifth aspect of the present invention, there is provided a discharge lamp having a long luminous tube having a large difference in expansion and contraction due to a thermal effect at the time of vertical lighting and blinking, and particularly having a total length of 25 cm or more. Further, the same effects as those of the fourth aspect are obtained.

Further, according to the invention of claim 6, when the invention is applied to a long multi-tube discharge lamp which is vertically lit, the starting voltage can be reduced and the starting characteristics can be improved. Since the discharge lamp having the effects described in Item 5 is provided, it is possible to provide a photochemical reaction device that can obtain a predetermined chemical reaction at a low cost with few accidents caused by the discharge lamp.

[Brief description of the drawings]

FIG. 1 shows a multi-tube discharge lamp according to an embodiment of the present invention.
FIG. 3 is a schematic front view in which a part is notched.

FIG. 2 is a schematic side view of FIG.

FIG. 3 is a cross-sectional view of a portion cut along a line AA in FIG. 1;

FIG. 4 is a schematic front view in which a part of the arc tube and the middle tube in FIGS.

5 is a partially cutaway front view of a support member that supports the arc tube and the proximity conductor in FIG. 4;

FIG. 6 is a longitudinal section showing a part of the embodiment of the photochemical reaction device of the present invention.

FIG. 7 is a schematic circuit diagram showing a lighting circuit device for a multi-tube discharge lamp.

FIG. 8 is a partially cut away front view showing another embodiment of the proximity conductor and the support member according to the present invention.

9 (a) and 9 (b) are front views of another embodiment of the proximity conductor and the support member according to the present invention, which are partially cut away and omitted.

10 (a) and 10 (b) show another embodiment relating to the mounting structure of the support member to the arc tube according to the present invention, wherein FIG. It is a schematic front view of the operation state after starting.

[Description of Signs] L: Multi-tube discharge lamp 1: Surrounding tube 11: Sealing portion 13a, 13b: Power supply (power supply member) 16L, 16R: Power supply line (power supply member) 17a, 17b: Lead wire (power supply) 18L, 18R: lead wire (power supply member) 3: middle tube 35, 36: lead wire (power supply member) 4: arc tube 41: ceramic bulb 44a, 44b: electrode 6: proximity conductor 7A to 7D: support member 71: Electrical insulator (tube, empty rod) 73: Anchor 74: Through hole 8: Photochemical reaction device 81: Photochemical reaction tank main body

 ────────────────────────────────────────────────── ─── Continuing on the front page (72) Inventor, Tsuguo Yashiro 9th, Oecho, Minato-ku, Nagoya City, Aichi Prefecture Toray Industries, Inc. Nagoya Works (72) Inventor, Hiroki Sasaki 4-3-1 Higashishinagawa, Shinagawa-ku, Tokyo No. 1 Toshiba Lighting & Technology Corporation F term (reference) 5C039 BA06 BA07 BB01 5C043 AA14 AA20 BB01 CC01 CD01 CD05 DD03 EC01

Claims (6)

[Claims] 1. A long arc tube having a ceramic bulb with electrodes sealed at upper and lower ends thereof; a power supply member connected to upper and lower electrodes of the arc tube; A long supporting member made of an electrical insulator disposed close to the bulb; supported at a plurality of locations along the outer surface of the supporting member; A linear proximity conductor electrically connected at the other end to an electrode at the other end of the arc tube and spaced apart from the arc tube bulb; and these arc tube, power supply member, and support member And an outer tube that accommodates the adjacent conductor and has a power supply unit at one end. 2. The proximity conductor has a wire diameter of 0.05 to 2.0 m.
2. The multi-tube discharge lamp according to claim 1, wherein the multi-tube discharge lamp is composed mainly of m tungsten or rhenium. 3. The method according to claim 1, wherein the proximity conductor is supported on the supporting member via a wound or another member.
Or the multiple tube type discharge lamp according to claim 2. 4. The multiplexing device according to claim 1, wherein the support member is provided with a switch unit for opening an electrical connection between the adjacent conductor and the electrode after starting. Tube discharge lamp. 5. The multiple tube type according to claim 1, wherein the arc tube has a total length of 25 cm or more and is housed in an outer tube via a middle tube. Discharge lamp. 6. A multi-tube discharge lamp according to any one of claims 1 to 5, a discharge lamp lighting device connected to the multi-tube discharge lamp, and a multi-tube discharge lamp. A reactor main body containing a discharge lamp;