WO2012012953A1 - 一种电极组件 - Google Patents

一种电极组件 Download PDF

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Publication number
WO2012012953A1
WO2012012953A1 PCT/CN2010/076235 CN2010076235W WO2012012953A1 WO 2012012953 A1 WO2012012953 A1 WO 2012012953A1 CN 2010076235 W CN2010076235 W CN 2010076235W WO 2012012953 A1 WO2012012953 A1 WO 2012012953A1
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WO
WIPO (PCT)
Prior art keywords
rod
electrode assembly
cermet
cermet rod
assembly structure
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PCT/CN2010/076235
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English (en)
French (fr)
Inventor
张万镇
谢灿生
陆镇洲
杨双节
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潮州市晨歌电光源有限公司
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Publication of WO2012012953A1 publication Critical patent/WO2012012953A1/zh

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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0732—Main electrodes for high-pressure discharge lamps characterised by the construction of the electrode
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01J—ELECTRIC DISCHARGE TUBES OR DISCHARGE LAMPS
    • H01J61/00—Gas-discharge or vapour-discharge lamps
    • H01J61/02—Details
    • H01J61/04—Electrodes; Screens; Shields
    • H01J61/06—Main electrodes
    • H01J61/073—Main electrodes for high-pressure discharge lamps
    • H01J61/0735—Main electrodes for high-pressure discharge lamps characterised by the material of the electrode

Definitions

  • the present invention relates to an electrode assembly.
  • the global ceramic metal halide lamp arc tube manufacturer mainly adopts the following two electrode structure forms: the first structure, as shown in Fig. 1, is a tungsten core rod 1 which is respectively sheathed with a tungsten spring 4, and is closely packed with molybdenum.
  • the molybdenum rod 2 of the spiral 5 and the mast 3 used as the outer lead are collimated and welded together by laser welding, or the mast and the molybdenum rod which is closely wound with the molybdenum spiral are connected by electron beam welding, which is tungsten-
  • the three-stage electrode structure of molybdenum-bismuth non-equal structure is adopted by most electric light source enterprises in the world.
  • Another structure is that a few enterprises at home and abroad use cermet rods instead of molybdenum rods as connecting rods or molybdenum rods.
  • a non-equal diameter electrode structure of one end of the cermet rod is added between the mast and the mast.
  • the electrodes of the above two structures have inevitable defects both in the structure itself and in the sealing mode, which affects the performance of the whole lamp.
  • an object of the present invention to provide an electrode assembly structure that prevents excessive conduction of heat to the ends of the electrode assembly and ensures excellent performance in all aspects of the lamp.
  • the technical solution of the present invention is: an electrode assembly structure comprising a tungsten core rod, a cermet rod and a lead structure which are sequentially connected, the tungsten core rod has a discharge end at one end and a metal ceramic rod at the other end One end is connected, and the other end of the cermet rod is connected to the lead structure.
  • This solution uses a high thermal resistance cermet rod to prevent excessive conduction of heat to the end of the electrode assembly, ensuring excellent performance in all aspects of the lamp.
  • the outer diameter of the tungsten core rod is equivalent to the outer diameter of the cermet rod.
  • the tungsten core rod is not overheated, and the tungsten electrode tip is not provided with a heat sinking spiral.
  • the tungsten discharge pole of the conventional structure is wound around the spiral tungsten wire, so that the end heat is dissipated, but it is unfavorable for the tip discharge and the tungsten evaporation causes damage to the luminescence effect due to the high temperature.
  • the cermet rod is mixed with at least one of aluminum oxide, cerium oxide, magnesium aluminum spinel, yttrium aluminum garnet, and metal: tungsten, molybdenum, chromium, niobium, tantalum, vanadium, niobium, zirconium, and titanium.
  • a metal-coated refractory oxide particle having a mass fraction of greater than or equal to 40% and less than or equal to 55% is obtained.
  • a small amount of magnesium oxide, zirconium oxide or ceramic fiber can be further added, so that the expansion coefficient of the cermet rod is close to that of the translucent alumina blister, and the toughening effect is enhanced, and the mechanical properties of the product are improved, and the cermet is prepared.
  • the conductivity requirement is higher than 1 ⁇ 10 6 s/m, and the thermal conductivity is controlled at 25 to 45 W/Mk.
  • the lead structure is made of a material having high temperature oxidation resistance and a resistivity of less than 70 ⁇ cm and a coefficient of expansion of less than 9 ⁇ 10 -6 /K, which may be made of a chromium-based, nickel-based, ruthenium-based, ruthenium-based or IrPt special alloy. Or NiAl intermetallic compound or ZrC, NbC, TaC, HfC, WC.
  • the cermet rod is connected to the lead structure or the ferrule rod leading end forms a constrained structure.
  • the limiting structure is formed by processing a round or tapered shape or a square step at the end of the cermet rod or welding one to three positioning pieces at the end of the cermet rod or sintering one to three protrusions by laser or mechanically processing one. Formed into three bulges.
  • the discharge end of the tungsten core rod is processed into a round head or a flat head having a necked structure, a conical head or a spiral groove structure.
  • the round head or the flat head can effectively improve the emission capability of the hot electrons, and is processed into a necking structure, a conical head or a spiral groove structure to lower the temperature of the rear end of the electrode assembly and prevent the temperature from being transmitted backward.
  • the tungsten core rod and the cermet rod are welded by laser welding or arc welding, and the lead structure is welded by laser or arc welding at the other end of the cermet rod for connection with the external circuit.
  • the invention of the electrode assembly structure comprises a tungsten core rod and a cermet rod connected in sequence, the tungsten core rod has one end of a discharge end, the other end is connected with one end of the cermet rod, and the other end of the cermet rod is directly used as a lead structure. .
  • the outer diameter of the tungsten core rod and the cermet rod is equivalent to the inner diameter of the high efficiency ceramic tube. Since the end of the high-efficiency ceramic tube has a soldering groove larger than the inner diameter of the pin, and the end of the electrode assembly cermet rod is provided with a positioning structure matched with the soldering groove, the soldering groove is filled with solder to achieve a hermetic package, and the lead structure Pass through the solder as an external electrode.
  • the invention solves The traditional ceramic metal halide lamp electrode molybdenum spiral and its gap will inevitably penetrate into the metal halide vapor and condense in the gap, resulting in the continuous reduction of metal halides in the arc tube, affecting the color temperature and light effect of the lamp;
  • the conventional electrode uses a molybdenum-ruthenium material as an electrode connector, and the heat of the discharge chamber is transmitted to the electrode tube and the end portion due to its high thermal conductivity, so that the temperature of the electrode tube is increased, and the temperature of the discharge chamber is weakened.
  • the problem that affects the performance of the lamp is solved.
  • the vertical structure of the conventional electrode with different diameters of the components is solved.
  • the invention transfers the conventional sealing position from the wall of the electrode tube to the nozzle, and the diameter of the nozzle is large, which greatly facilitates the soldering and the sealing. Moreover, the solder melts and completes the sealing substantially in the weld groove without requiring a relatively long flow to the electrode tube hole wall to complete the sealing. In addition, the solder is farther away from the arc high temperature region than the prior art soldering process, and the length of the electrode tube The degree can be reduced accordingly, which is helpful for some applications where the electrode tube size is required to be shorter.
  • the cold end position of this scheme can effectively control the front, and because it is closer to the heat source part, the cold end temperature is increased and the working pressure of the light source is ensured.
  • the invention adopts a high-temperature anti-oxidation wire material as a lead structure connected to an external circuit, and the lead structure simultaneously satisfies the high-temperature oxidation resistance, the low-resistance conductivity and the performance of sealing and sealing with the cermet rod and the glass solder, so that
  • the lamp assembled by the structure electrode can be used without a cover glass cover, thereby facilitating the application of the lamp, broadening the application field, and the cost performance is better.
  • FIG. 1 is a schematic structural view of a prior art electrode assembly structure
  • FIG. 2 is a schematic structural view of a structure of an electrode assembly of the present invention
  • FIG. 3 is a schematic structural view of another electrode assembly structure of the present invention.
  • 4a-4d are four schematic views of the structure of a tungsten core rod
  • 5a-5d are schematic top views of the limiting structure
  • Figure 6 is a schematic structural view of an arc tube of the present invention.
  • Figure 7 is a schematic view showing the structure of another arc tube of the present invention.
  • the present invention discloses an electrode assembly structure including a tungsten core rod 11, a cermet rod 12 and a lead structure 13 which are sequentially connected, and one end of the tungsten core rod 11 is a discharge end and the other end is metal. One end of the ceramic rod 12 is connected, and the other end of the cermet rod 12 is connected to the lead structure 13.
  • the outer diameter of the tungsten core rod 11 is equivalent to the outer diameter of the cermet rod 12.
  • the cermet rod 12 is mixed with at least one of alumina, yttria, magnesium aluminate spinel, yttrium aluminum garnet, and metal: tungsten, molybdenum, chromium, niobium, tantalum, vanadium, niobium, zirconium, and titanium.
  • Metal-coated refractory oxide particles having a mass fraction of metal greater than or equal to 40% and less than or equal to 55%, and adding a small amount of magnesium oxide, zirconium oxide or ceramic fibers.
  • the lead structure 13 is made of a chromium-based, nickel-based, fluorenyl, fluorenyl or IrPt special alloy or a NiAl intermetallic compound or ZrC, NbC, TaC, HfC, WC.
  • One end of the cermet rod 12 connected to the lead structure 13 forms a constrained structure 14.
  • the discharge end of the tungsten mandrel 11 is machined into a rounded or flat head having a necked, tapered or spiral groove structure.
  • the limiting structure 14 is formed into a truncated cone or a tapered or square step at the end of the cermet rod 12 or a piece to three locating pieces at the end of the cermet rod 12 or sintered by laser. Three protrusions are formed.
  • the tungsten core rod 11 and the cermet rod 12 are welded by laser welding or arc welding, and the lead structure is welded to the other end of the cermet rod 12 by laser or arc welding for connection with an external circuit.
  • the electrode assembly can also be directly extended from the cermet rod 12, that is, a two-stage body electrode structure, which can make the electrode fabrication simpler, easier to manufacture, and reduce the manufacturing cost while satisfying the above advantages. .
  • the outer diameter of the cermet rod 12 is equivalent to the inner diameter of the electrode tube 16, and both of the positioning structures 14 are limited, and the welding groove 18 is filled.
  • the solder 19 is hermetically sealed. There is a lead 13 in Fig. 6, and the cermet rod 12 in Fig. 7 passes directly through the solder 19 as a connection to an external circuit.
  • Example 1 150W ceramic metal halide lamp three-stage electrode as shown in Figure 2, the specific dimensions of the components of the electrode described in this embodiment are: tungsten core rod diameter ⁇ A1: 1.2mm, length A1: 6.0mm, tungsten core rod discharge end is Semicircular; cermet rod diameter ⁇ A2: 1.2mm, length A2: 13mm; outer lead diameter ⁇ A3: 0.8mm, length A3: 11.5mm, two pieces of positioning piece are welded at the end of the cermet. Each part is laser welded.
  • Example 2 150W ceramic metal halide lamp two-stage electrode as shown in Figure 3, the specific dimensions of the components of the electrode described in this embodiment are: tungsten electrode diameter ⁇ B: 1.2mm, length B1: 6.0mm, the electrode tip is semi-circular; The cermet rod diameter ⁇ B: 1.2mm, B2: length 18mm, wherein the limit structure is 6mm from the top of the cermet rod. Each part is laser welded.

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Description

一种电极组件
技术领域
本发明涉及一种电极组件。
背景技术
目前全球陶瓷金卤灯电弧管生产商主要采用以下两种电极的结构形式：第一种结构，如图1所示，是分别将装套有钨弹簧4的钨芯棒1，密绕有钼螺旋5的钼杆2和用于作为外引线的铌杆3采用激光焊接的方法准直焊接在一起，或铌杆和密绕有钼螺旋的钼杆通过电子束焊的方法连接，为钨-钼-铌非等径结构的三段式电极结构，世界上大多电光源企业都采用这种结构；另外一种结构是国内外有少数企业采用金属陶瓷杆取代钼杆作为连接杆或在钼杆和铌杆之间增加一端金属陶瓷杆的各段非等径的电极结构。以上两种结构形式的电极无论在结构本身还是在封接方式上都存在不可避免的缺陷，影响整灯的性能。
现有技术由于钼螺旋的存在，使得钼螺旋冷端周围及其间隙在重复点燃使用中不可避免会渗透进金属卤化物蒸汽并凝结在间隙中，这就会导致成灯的色温和光效逐渐发生变化；由于采用钨钼铌材料作为电极组件，钼连接杆较高的热导率使电弧管的热量被导至毛细管末端，使之温度提高，反而剥弱电弧管的温度，影响灯的使用性能。
发明内容
针对现有技术的缺点，本发明的目的是提供一种阻止热量向电极组件末端的过量传导，保证成灯各方面的优异性能的电极组件结构。
为实现上述目的，本发明的技术方案为：一种电极组件结构，其包括依次连接的钨芯棒、金属陶瓷杆和引线结构，该钨芯棒的一端为放电端，另一端与金属陶瓷杆的一端连接，金属陶瓷杆的另一端连接引线结构。本方案采用高热阻的金属陶瓷杆，阻止了热量向电极组件末端的过量传导，保证了成灯各方面的优异性能。
该钨芯棒外径和金属陶瓷杆外径尺寸相当，其为了增加钨芯棒的表面积，使钨芯棒不致温度过高，而不用在钨电极头加套散热螺旋。而传统结构的钨放电极端部绕上螺旋钨丝，借以末端散热，但对尖端放电不利且由于处于高温易造成钨蒸发损害发光效果。
具体地，该金属陶瓷杆由氧化铝、氧化钇、镁铝尖晶石、钇铝石榴石和金属：钨、钼、铬、钽、铌、钒、铪、锆、钛中的至少一种材料混合，得到金属包覆的难熔氧化物颗粒，金属的质量分数大于或等于40%，且小于或等于55%。当然，还可以进一步添加少量的氧化镁、氧化锆或陶瓷纤维，使金属陶瓷杆的膨胀系数和半透明氧化铝泡壳接近，且起到增韧效果，提高产品机械性能，制成的金属陶瓷电导率要求高于1×106s/m,热导率控制在25～45W/Mk。
该引线结构采用高温抗氧化性能好且电阻率小于70μΩ·cm,膨胀系数小于9×10-6/K的材料制成，其可以由铬基、镍基、铪基、铼基或IrPt特种合金或NiAl金属间化合物或ZrC、NbC、TaC、HfC、WC制成。
该金属陶瓷杆与引线结构连接的一端或金属陶瓷杆引出端形成有限位结构。
该限位结构为在金属陶瓷杆末端加工成圆台或锥形状或方形梯台或者在金属陶瓷杆末端焊接一块到三块定位片或者用激光烧结一到三个凸起形成或者用机械方法加工一到三个凸起形成。
该钨芯棒的放电端加工成圆形头或平形头，该钨芯棒上具有缩颈结构、锥形头或螺旋式凹槽结构。
圆形头或平形头能有效提高热电子的发射能力，加工成缩颈结构、锥形头或螺旋式凹槽结构以降低电极组件后端的温度，防止温度向后传递。
该钨芯棒和金属陶瓷杆通过激光焊接或电弧焊焊接起来，再在金属陶瓷杆另一端用激光或电弧焊焊接引线结构，用于与外电路相接。
该电极组件结构的发明，包括依次相连接的钨芯棒及金属陶瓷杆，该钨芯棒的一端为放电端，另一端与金属陶瓷杆的一端连接，金属陶瓷杆的另一端直接作为引线结构。
该钨芯棒和金属陶瓷杆外径与高效陶瓷管的管脚内径尺寸相当。由于高效陶瓷管的管脚末端设有比管脚内径大的焊接槽，加上电极组件金属陶瓷杆末端设有与焊接槽配合的定位结构，焊接槽通过填充焊料实现气密性封装，引线结构穿过焊料作为外接电极。
本发明解决了 传统陶瓷金卤灯电极钼螺旋及其间隙中不可避免的会渗透进金属卤化物蒸汽并凝结在间隙中，导致电弧管中金属卤化物不断减少，影响成灯色温和光效的问题；其次解决了传统电极用钼铌材料作为电极连接体，由于其较高的热导率将放电腔的热量较多的传到至电极管及端部，使电极管的温度提高，而放电腔的温度减弱，导致影响成灯的使用性能的问题；最后解决了传统电极采用各组件直径不相同的垂直结构，在电弧管封装时两端电极位置距离难于准确固定，导致不利与成灯制作的一致性问题。
本发明将以往的封接位置由电极管孔壁转移到管口，管口的直径较大，大大方便了放焊料和完成封接。而且，焊料基本在焊接槽融化和完成封接，而不需要通过相当长的流动到电极管孔壁来完成封接。另外，焊料比起在现有技术焊接的工艺更远离电弧高温区，电极管的长 度可以相应减小，有助于一些对电极管尺度要求短小一点的应用。此方案的冷端位置能有效控制靠前，由于更接近热源部分，提高了冷端温度，保证光源的工作压力。
本发明采用了高温抗氧化导线材料作为与外电路连接的引线结构，引线结构同时满足具备高温抗氧化性能，低电阻的导电性和可以与金属陶瓷杆及玻璃焊料匹配封接的性能，使得由该结构电极组装的成灯可以不用加套玻璃外罩，从而使成灯应用方便，拓宽应用领域，性价比更优良。
附图说明
图1 为现有技术电极组件结构的结构示意图；
图2 为本发明电极组件结构的结构示意图；
图3 为本发明另一种电极组件结构的结构示意图；
图4a-4d 为钨芯棒的四种结构示意图；
图5a-5d 为限位结构的俯视示意图；
图6 为本发明电弧管的结构示意图；
图7 为本发明另一种电弧管的结构示意图。
具体实施方式
以下结合实施例及附图对本发明进行详细的描述。
如图2所示，本发明公开了一种电极组件结构，其包括依次连接的钨芯棒11、金属陶瓷杆12和引线结构13，该钨芯棒11的一端为放电端，另一端与金属陶瓷杆12的一端连接，金属陶瓷杆12的另一端连接引线结构13。
进一步地，该钨芯棒11外径和金属陶瓷杆12外径尺寸相当。
该金属陶瓷杆12由氧化铝、氧化钇、镁铝尖晶石、钇铝石榴石和金属：钨、钼、铬、钽、铌、钒、铪、锆、钛中的至少一种材料混合，得到金属包覆的难熔氧化物颗粒，金属的质量分数大于或等于40%，且小于或等于55%，并且添加少量的氧化镁、氧化锆或陶瓷纤维。
该引线结构13由铬基、镍基、铪基、铼基或IrPt特种合金或NiAl金属间化合物或ZrC、NbC、TaC、HfC、WC制成。
该金属陶瓷杆12与引线结构13连接的一端形成有限位结构14。
如图4a-4d所示，该钨芯棒11的放电端加工成圆形头或平形头，该钨芯棒11上具有缩颈结构、锥形头或螺旋式凹槽结构。
如图5a-5d所示，该限位结构14为在金属陶瓷杆12末端加工成圆台或锥形状或方形梯台或者在金属陶瓷杆12末端焊接一块到三块定位片或者用激光烧结一到三个突起形成。
该钨芯棒11和金属陶瓷杆12通过激光焊接或电弧焊焊接起来，再在金属陶瓷杆12另一端用激光或电弧焊焊接引线结构，用于与外电路相接。
如图3所示，电极组件的还可以是金属陶瓷杆12直接延伸出来，即两段体电极结构，该结构在满足以上有的优点的同时使电极制作更加简单，易于制作，降低了制造成本。
如图6、7所示，不论是采用三段式或二段式电极结构，金属陶瓷杆12的外径与电极管16的内径相当，且都有限位的定位结构14，焊接槽18通过填充焊料19进行气密性封装。图6中有引线13，图7中金属陶瓷杆12直接穿过焊料19作为外电路的连接。
以下所述实例只是对于本发明作进一步说明，并不构成对权利要求范围的限制。任何建立在本发明技术实质基础上而稍作修改变化所设计出来的电极产品，均在本发明权利要求范围之内。
实施例1 150W陶瓷金卤灯三段式电极，如图2，本实施例所述的电极各部分组件的具体尺寸为：钨芯棒直径ΦA1：1.2mm，长度A1:6.0mm,钨芯棒放电端为半圆形；金属陶瓷杆直径ΦA2：1.2mm，长度A2:13mm;外引线直径ΦA3：0.8mm,长度A3:11.5mm，在金属陶瓷末端焊接两片定位片。各部分采用激光焊接。
实施例2 150W陶瓷金卤灯两段式电极，如图3，本实施例所述的电极各部分组件的具体尺寸为：钨电极直径ΦB：1.2mm，长度B1:6.0mm,电极头为半圆形；金属陶瓷杆直径ΦB：1.2mm，B2:长度18mm其中限位结构在距离金属陶瓷杆顶端6mm处。各部分采用激光焊接。

Claims (10)

  1. 一种电极组件结构，其特征在于，包括依次连接的钨芯棒、金属陶瓷杆和引线结构，该钨芯棒的一端为放电端，另一端与金属陶瓷杆的一端连接，金属陶瓷杆的另一端连接引线结构。
  2. 根据权利要求1所述的电极组件结构，其特征在于，该钨芯棒外径和金属陶瓷杆外径尺寸相当。
  3. 根据权利要求2所述的电极组件结构，其特征在于，该金属陶瓷杆由氧化铝、氧化钇、镁铝尖晶石、钇铝石榴石和金属：钨、钼、铬、钽、铌、钒、铪、锆、钛中的至少一种材料混合，得到金属包覆的难熔氧化物颗粒，金属的质量分数大于或等于40%，且小于或等于55%。
  4. 根据权利要求3所述的电极组件结构，其特征在于，该金属陶瓷杆还添加少量的氧化镁、氧化锆或陶瓷纤维。
  5. 根据权利要求2所述的电极组件结构，其特征在于，该引线结构由高抗卤化的铬基、镍基、铪基、铼基或IrPt特种合金或NiAl金属间化合物或ZrC、NbC、TaC、HfC、WC制成。
  6. 根据权利要求2所述的电极组件结构，其特征在于，该金属陶瓷杆与引线结构连接的一端或金属陶瓷杆引出端设有限位结构。
  7. 根据权利要求6所述的电极组件结构，其特征在于，该限位结构为在金属陶瓷杆末端加工成圆台或锥形状或方形梯台或者在金属陶瓷杆末端焊接一块到三块定位片或者用激光烧结一到三个突起形成或者用机械方法加工一到三个突起形成。
  8. 根据权利要求1所述的电极组件结构，其特征在于，该钨芯棒的放电端加工成圆形头或平形头，该钨芯棒上具有缩颈结构、锥形头或螺旋式凹槽结构。
  9. 根据权利要求1所述的电极组件结构，其特征在于，该钨芯棒和金属陶瓷杆一端通过激光焊接或电弧焊焊接起来，金属陶瓷杆另一端用激光或电弧焊焊接引线结构，用于与外电路相接。
  10. 一种电极组件结构，其特征在于，包括依次连接的钨芯棒、金属陶瓷杆结构，该钨芯棒的一端为放电端，另一端与金属陶瓷杆的一端连接，金属陶瓷杆的另一端直接作为引线结构。
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