WO2009135345A1

WO2009135345A1 - Compound hid electric arc tube

Info

Publication number: WO2009135345A1
Application number: PCT/CN2008/001304
Authority: WO
Inventors: 陈宗烈
Original assignee: Chen Zonglie
Priority date: 2008-05-05
Filing date: 2008-07-11
Publication date: 2009-11-12
Also published as: JP2011520225A; EP2284861A1; EP2284861A4; KR101430289B1; JP5281151B2; EP2284861B1; KR20110021846A

Abstract

A compound HID electric arc tube includes a discharge tube and two lead-out tubes. The discharge tube has an envelope of blown melted quartz glass or Vycor-type quartz glass with a semitranslucent polycrystalline aluminum oxide (PCA) layer applied to the inside surface thus forming a double-layer envelope. The lead-out tubes are made of melted quartz glass or Vycor-type quartz glass and, near the two ends of the arc tube, are partially coated on their inside surfaces with a polycrystalline aluminum oxide (PCA) layer. After high temperature sintering of the electric arc tube, a two-stage method is used to seal the electrodes. A glass solder seal is used in the first section of the lead-out tube having the inner coating of PCA, and a molybdenum foil press seal is used to seal the quartz glass second section.

Description

Compound HID arc tube

This invention relates to arc tubes for use in lighting devices, and more particularly to composite HID arc tubes for use in high pressure gas discharge lamps (HID). Background technique

Generally, quartz is used as the material for the HID arc tube. This is because quartz has a strong withstand voltage and can withstand about 200 to 300 atmospheres. On the other hand, an arc tube made of quartz material is easily sealed. However, quartz materials have obvious disadvantages at the same time. On the one hand, the quartz arc tube is formed by hot air melting at the temperature of the outer mold, and the inner cavity is blown into the high pressure air, and the inner cavity size becomes an uncontrollable free working force; When the quartz arc tube is operated at a high temperature, the color rendering property is deteriorated, the luminous efficiency and stability are lowered, and the sodium metal loss in the lamp is severe.

In recent years, quartz arc tubes, especially for low-power display lighting lamps, have been replaced by polycrystalline alumina (PCA) ceramic arc tubes, which greatly improve the uniformity and stability of light color. One of the reasons for the improvement of the color consistency of the ceramic arc tube instead of the quartz arc tube metal halide lamp (MH) is that the ceramic arc tube is made by molding or grouting at room temperature, and its geometry is strictly controlled, and the other The reason is that the ceramic arc tube increases the working temperature of the pipe wall: in the case of high wall temperature, a minimum value can be observed on the correlation color temperature and the wall temperature curve, and the ceramic arc tube can fully adapt to this. Working in a region of minimum color temperature (for quartz arc tubes, this region appears above the reasonable operating temperature that quartz glass can withstand), especially when the filler in the lamp is sodium and rare earth halides, the more turbulent operating temperature The lamp has excellent color rendering (Ra > 80) and improved luminous efficiency (> 901m*W-. Another major advantage of the polycrystalline alumina structure is that during the lifetime, the loss of sodium metal in the lamp is greatly reduced, ensuring light The color is more stable than the metal halide lamp products of the traditional quartz arc tube.

The Chinese patent No. 98115658. 4 discloses a ceramic shell assembly of a high pressure discharge lamp, a shell structure PCA shell and a specially designed axially layered alumina cermet multilayer structure. The final part of the multi-part end plug is directly sintered to the relevant feedthrough line without any sealing material while maintaining a certain coefficient of thermal expansion. But in fact, due to the high operating temperature of the lamp and the intense corrosion of molten metal halides and vapors, this type of sealing is also difficult to mention. For long-term reliable sealing and long life.

A ceramic lamp is also disclosed in US Pat. No. 6,313,582, the discharge tube of which is made of translucent ceramic, and the sealing tube portion is sealed with a sealing material based on Dy ₂ 0 ₃ -Al ₂ 0 ₃ -Si0 ₂ . . This kind of arc tube made of ceramic has the disadvantage of PCA's own pressure difference (only about 3-5 atmospheres), the actual package electrode is difficult, and it needs to be filled into the arc in the real state during the exhaust process. Gold halide pellets, mercury injection, filling with various inert gases, and relying on glass solder to achieve a hermetic sealing between the outer leads of the electrodes and the ceramic material is not easy, and often goes to the final step of making the arc tube. Failure, the former work was abandoned, which seriously affected the comprehensive qualification rate of ceramic arc tubes, which not only made the cost high. Moreover, the current technology can only be used for medium and small power arc tubes of less than 150w. For high power of 250W or more to several KW, there is no example of popularized commercial applications. Therefore, this advanced lighting technology is also Not promoted and popularized.

The technical solutions disclosed in the above patent documents are hereby incorporated by reference. Summary of the invention

Therefore, in view of the advantages and disadvantages of translucent polycrystalline alumina in quartz materials, and the problems in sealing, the present invention combines the advantages of the two materials and compensates for their respective shortcomings, and proposes a novel arc tube. .

The object of the present invention is to provide a composite HID arc tube, the main feature of which is to partially coat a layer of translucent polycrystalline alumina in a quartz tube blown with quartz glass or Vycor quartz glass, and then The high temperature embryo is fired into a fused silica glass and a translucent polycrystalline alumina or a translucent polycrystalline alumina composite HID arc tube. The composite HID arc tube retains the easy sealing of quartz glass and can withstand high pressure work. The inner cover molding grout is used to coat the translucent polycrystalline alumina, so that the inner diameter of the arc tube is strictly controlled, and the inner wall of the arc tube is improved. Operating temperature and effective prevention of sodium penetration. The metal halide lamp produced by the composite HID arc tube can increase the inflation pressure of the lamp in the lamp by 20%-50% than that of the conventional metal halide lamp made of ordinary polycrystalline alumina. Therefore, the light efficiency can be improved by about 25%. In particular, the composite HID arc tube technology can be used to fabricate an arc tube of an ultra-high pressure mercury lamp (UHP) light source, which can effectively overcome the existing UHP quartz arc tube due to the inner wall temperature. High recrystallization and devitrification reduce the problem of early failure of compressive strength. The composite HID arc tube according to the present invention comprises a discharge tube and two extraction tubes, characterized in that:

The discharge tube is a composite double-layered shell formed by blowing a fused silica glass or a stellite quartz glass and coated with a translucent polycrystalline alumina layer, and

The take-up tube is composed of fused silica glass or yoke quartz glass, and a polycrystalline alumina layer is partially coated on both ends of the arcing chamber in the lead-out tube.

According to an aspect of the invention, in the above composite HID arc tube, the arc chamber of the discharge tube is of an olive type or an ellipsoid type.

5 厚的的厚。 The second leg of the thickness of the inner wall of the outer layer of the outer wall of the outer tube Translucent polycrystalline alumina layer.

According to still another aspect of the invention, the outlet tube of the composite HID arc tube is sealed in two different ways.

According to still another aspect of the present invention, in the above composite HID arc tube, wherein a portion of the extraction tube is coated with polycrystalline alumina, and Al ₂ 0 ₃ , Dy ₂ 0 ₃ , Si0 _{2 are used.} The mixture is sealed by a main body of glass solder, and the position of the lead-out tube is made of quartz glass, which is heated and sealed by a coal-oxygen fire.

In addition, the composite HID arc tube according to the present invention, wherein the polycrystalline alumina layer is coated by: inserting a liner made of heat-resistant silica gel into the arc chamber of the discharge tube and the extraction tube, and then injecting The pressure of the air makes the silica gel liner a precise inner liner film, and then injects high-purity alumina powder with a small amount of binder, grain production inhibitor, into the gap between the inner liner film and the outer casing. The plasticizer is fully mixed with the ceramic slurry. After grouting, it should be cured at room temperature, demolded, 500 ° C ~ 600 ° C low temperature supercharged embryo, 1000 Ό medium temperature pre-burn, then add precision alumina outer mold, lining The mold sleeve prevents the high temperature deformation of the quartz glass, and is forged for 3 to 4 hours after being vacuumed at 180 CTC, and then the workpiece is quickly removed from the high temperature furnace for strong wind cooling.

The present invention is in contrast to the prior art, and its effects are positive and obvious. Specifically, the composite HID arc tube of the present invention retains both quartz glass in comparison with the disadvantage that the quartz material is not resistant to high temperatures and is prone to loss of sodium metal, and the polycrystalline alumina material is not resistant to high pressure and is difficult to package. The arc tube is easy to form, has good assembly sealing, good pressure resistance, high working pressure, and absorbs the geometrical specification of the translucent polycrystalline alumina (PCA) arc chamber. High temperature, strong resistance to sodium penetration. Therefore, the composite HID arc tube of the invention can improve the working pressure and temperature, prevent sodium penetration and deformation deformation of the liquid silicon film formed on the electrode surface, and improve the light color stability and light effect of the HID, especially the Li lamp, and prolong The life of the lamp.

The objects, features, and advantages of the invention will be described in detail by the embodiments and the accompanying drawings. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a schematic view of a composite HID arc tube of the present invention. detailed description

Hereinafter, the present invention will be specifically described with reference to the accompanying drawings.

As shown in FIG. 1, a composite HID arc tube of the present invention has a discharge tube 1, an electrode 2, a molybdenum lead 3, a molybdenum foil 4, a molybdenum outer lead 5, and an electrode 2 is disposed on the arc of the discharge tube 1. In the cavity 13, the molybdenum lead 3, the molybdenum foil 4, and the molybdenum outer lead 5 are sequentially connected to the electrode 2, and are respectively disposed in two lead pipes at both ends of the discharge tube 1, wherein the discharge tube 1 is made of fused silica glass or The quartz glass 11 is blown to the outer casing, and is coated with a composite double-layered casing made of translucent polycrystalline alumina (PCA) 12, and two thin and long outlet tubes 14 are disposed on both sides of the arc chamber 13 of the discharge tube 1. One end of the lead-out tube 14 facing the arc chamber 13 is also coated with a translucent polycrystalline alumina layer 12, which is the electrode 2, the molybdenum lead 3, and the molybdenum foil 4 in this order from the arc chamber 13 to the outside. And the molybdenum outer lead 5, the position of the lead-out tube 14 corresponding to the molybdenum lead 3 is a portion in which the polycrystalline alumina 12 is coated, and a mixture of Al ₂ 0 ₃ , Dy ₂ 0 ₃ , and Si0 ₂ is mainly used. The glass solder 15 is sealed, and the extraction tube 14 corresponding to the molybdenum foil 4 is a single-layer glass tube position composed of quartz glass 11. After the fire coal and oxygen using heat and pressure seal, said discharge vessel 1 there are various metal halides, mercury or mercury alternatives, high purity argon, neon, argon or xenon gas mixture depending on the variety of filling.

Further, the composite HID arc tube according to the present invention, wherein the arc chamber 13 of the discharge tube is of an olive type or an ellipsoid type, the inner wall of the arc chamber 13 and the outlet tube 14 of about 3 to 8 mm near the ends of the chamber The inner wall is uniformly coated with a thickness of 0.2 to 0.5 by a thick translucent polycrystalline alumina layer 12. Further, according to the composite HID arc tube of the present invention, the electrode 2 is sealed by the first segment and the second segment segment sealing method.

Further, according to the composite HID arc tube of the present invention, the inner wall of the arc chamber 13 of the discharge tube and the inner wall of the extraction tube 14 of about 3 to 8 mm near the ends of the chamber are uniformly coated with the translucent polycrystalline alumina layer 12 When coating, the liner made of heat-resistant silica gel is inserted into the inner cavity 13 of the discharge tube and the extraction tube 14, and then a certain pressure of air is injected to make the silica gel liner a precise inner liner film. And further filling the gap between the inner liner film and the fused silica glass or the quartz glass outer casing 11 of the discharge tube 1 into a high-purity alumina powder with a small amount of a binder, a crystal production inhibitor, and a plasticizer. Mix well with the ceramic slurry.

Further, the composite HID arc tube according to the present invention, wherein the inner wall of the arc chamber 13 is adjacent to the ends of the chamber by about 3 to 8 mm, and the inner wall of the outlet tube 14 is uniformly translucent polycrystalline alumina layer 12, which is passed after the grouting Room temperature curing, demoulding, 500Ό~600Ό low temperature supercharged embryo burning, 100CTC medium temperature pre-burning, then adding precision alumina outer mold, inner liner mold sleeve to prevent high temperature deformation of quartz glass 11, 1800 °C vacuum high temperature calcination 3-4 After hours, the workpiece is quickly removed from the high temperature furnace and cooled by strong wind to prevent the quartz casing 11 from being devitrified.

Further, according to the composite HID arc tube of the present invention, the electrode 2 is sealed by the first stage and the second stage, wherein the distance between the ends of the arc chamber 13 adjacent to the arc tube is about 3 to 8 The section of the outlet pipe 14 is the first section, and the outlet pipe extending from the section to the outside by 10 to 20 inches is referred to as the second section. The inner wall of the first section of the outlet pipe 14 is coated with the translucent layer as the inner wall of the arc chamber 13 The crystalline aluminum oxide layer 12 is sealed by a glass solder 15 mainly composed of a mixture of Al ₂ 0 ₃ , Dy ₂ 0 _{: i} , and Si0 ₂ , and the second stage is quartz glass or modified quartz glass 11 . Quartz glass, molybdenum-resistant glass, non-matching sealing with molybdenum foil 4, or direct sealing with molybdenum rods to increase the airtightness of the lamp operating at ultra-high pressure, such as 100~200atm.

In the example shown in Fig. 1, the arc tube 1 is preferably blown from a high-purity fused silica glass 11 having a hydroxyl content of 10 ppm using an ellipsoidal arc tube casing 11 having a maximum diameter of Φ 18. 5 awake, an average wall thickness of 1 8毫米, the thinnest part 1. 5mm, the inner layer of the translucent alumina (PCA) layer 12, the average thickness of 0. 2 legs, the thinnest part of the 15 cut, the thickest part 0. 25mm; 2 It is made of tantalum tungsten material and has good emission performance. The gold halide filling of the lamp is selected from ScI3- CeI3- lnI3- Til-Nal, so the wall load Ws is about 20W/cm ² , the beacon Weighing 150W.

Tested in the case of an electronic ballast with a lamp matching high frequency square wave current, voltage and balanced power output: initial light effect 1101111/1⁄2, average light efficiency 951m/w, color rendering index Ra 85, color temperature 4200K, life 20 , 000 hours, and the consistency of light color during the life of the lamp is much better than that of the quartz sodium lamp.

In accordance with an embodiment of the present invention, metal molybdenum is used as a lead and a foil for connection to the electrodes for illustrative purposes, but the invention is not limited to metallic molybdenum, and may be replaced with other suitable metals or alloys.

Ceramic metal halide lamps can be fabricated using the arc tube of the present invention, typically in a two-terminal or single-ended manner. In the double-end mode, wires are connected to both ends of the arc tube at both ends of the lamp housing, and the lamp housing is generally available in a cylindrical shape or a conical shape. In the single-ended mode, the wires are only provided at one end of the lamp housing, and the leads at both ends of the arc tube are led out through the wires. The lamp housing is generally available in a spherical or ellipsoidal shape.

All patents cited above are hereby incorporated by reference in their entirety herein in their entirety. While the invention has been described in detail with reference to the preferred embodiments of the present invention, it is understood that the invention is not intended to limit the invention. Rather, the invention is to cover all modifications, embodiments and alternative embodiments within the spirit and scope of the invention as defined in the appended claims.

Claims

Rights request

A composite HID arc tube comprising a discharge tube (1) and two extraction tubes (14), characterized in that:

The discharge tube is a composite double-layer casing formed by blowing a fused silica glass or a stellite glass into a casing (11) and coated with a translucent polycrystalline alumina layer (12), and the extraction tube It is composed of fused silica glass or baiqu quartz glass, and a polycrystalline alumina layer is partially coated in the outlet tube at both ends of the arc chamber.

0. 5mm. 5mm. 5mm. 5mm. 5mm. A thick translucent polycrystalline alumina layer.

3. The composite HID arc tube according to claim 1 or 2, wherein the arc chamber of the discharge tube is of an olive type or an ellipsoid type.

4. The composite HID arc tube of claim 1 or 2, wherein: the outlet tube is sealed in two different ways.

5. The composite HID arc tube of claim 3 wherein: said outlet tube is sealed in two different ways.