WO2011153795A1

WO2011153795A1 - High-efficiency ceramic lamp

Info

Publication number: WO2011153795A1
Application number: PCT/CN2010/079329
Authority: WO
Inventors: 张万镇; 谢灿生; 高鞠
Original assignee: 潮州市灿源电光源有限公司
Priority date: 2010-06-07
Filing date: 2010-12-01
Publication date: 2011-12-15
Also published as: CN101882560B; CN101882560A

Abstract

A high-efficiency ceramic lamp includes a discharge cavity (18), electrode tubes (15) on the two ends of the discharge cavity and electrode assemblies extending into the discharge cavity through the electrode tubes. The electrode tubes include inner tubes and weld grooves (13). The inner tubes are close to the discharge cavity, and the weld grooves are positioned on the ends of the electrode tubes. The inner diameter of the weld grooves is bigger than the inner tubes. The weld grooves are filled with solders (12) to realize a hermetically tight seal of the discharge cavity. A tungsten mandril (16), a conducting rod (14) and a lead (11) or a conducting tube are connected in sequence to form an electrode assembly. The tungsten mandril extends into the discharge cavity. The conducting rod is positioned in the inner tube, and the outer diameter of the conducting rod is equal to the inner diameter of the inner tube. The lead extending out of the electrode tube though the solder of the weld groove connects to the end of the conducting rod. Or the conducting tube extending out of the electrode tube though the solder of the weld groove connects to the lead.

Description

High efficiency ceramic lamp

技术领域 Technical field

The invention belongs to the field of ceramic light sources, and in particular relates to a high efficiency ceramic lamp.

背景技术 Background technique

The ceramic arc tube structure is directly related to the sealing process. Sealing is the key technology of ceramic discharge light source. The quality of sealing is directly related to the performance and life of arc tube. The sealing technology of ceramic discharge tube is different from quartz. The quartz metal halide lamp is shrink-sealed or compression-sealed by melting quartz and electrode or electrode assembly. The ceramic is not melted after molding, and the sealing of ceramic and electrode or electrode assembly is The gap between the ceramic and the electrode is filled by the glass solder, as shown in FIG. 1 , which includes a discharge chamber 6 , an electrode tube 2 disposed at both ends thereof, and an electrode assembly inserted in the electrode tube 2 , and the electrode assembly includes the electrode assembly. The electrode tip 5, the molybdenum wire 3, and the manifold 1 are located in the discharge chamber, and the solder flows into the gap 4 between the electrode tube 2 and the electrode assembly to achieve welding.

To achieve complete air tightness, the main sealing technology is to design the ceramic discharge tube pin as two capillaries with a small gap between the inner diameter and the electrode assembly. The glass solder is heated together with the ceramic discharge tube and the electrode during the sealing process. The melting point of the glass solder is lower than the softening point of the ceramic, and it has good fluidity after melting, and then penetrates into the gap between the ceramic capillary and the electrode assembly. The sealing of the ceramic tube is completed after cooling. Almost all of the current ceramic metal halide lamps use this sealing technique in the capillary.

The sealing is divided into two steps: the first step is to seal one end, that is, one, with the above description. Then inflate, add metal halide pellets and mercury, at the other end of the seal, ie two.

The filling state of the solder in the gap between the ceramic capillary and the electrode assembly, such as filling depth, uniformity, tightness, including the material state of the solder itself, is the key and difficulty in ensuring the quality of the ceramic lamp. Because it is directly related to the airtightness of ceramic lamps. However, in such a sealing structure, the glass solder is located in the gap between the capillary and the electrode assembly. Once the arc tube is in operation, the luminescent substance in the discharge chamber penetrates into the gap and reacts with the glass solder at a high temperature to cause loss of luminescent material and damage to the solder seal. . Moreover, this sealing process is very complicated.

发明内容 Summary of the invention

In view of the disadvantages of the prior art, an object of the present invention is to provide an efficient ceramic lamp having high luminous efficiency and good sealing effect.

In order to achieve the above object, the technical solution of the present invention is: a high-efficiency ceramic lamp comprising a discharge chamber, an electrode tube disposed on both sides of the discharge chamber, and an electrode assembly extending into the discharge chamber through the electrode tube, the electrode tube including the connected The inner pipe section and the welding groove are close to the discharge cavity, the welding groove is located at the end face, and the inner diameter of the welding groove is larger than the inner pipe section, and the welding groove realizes the hermetic sealing of the discharge cavity by filling the solder.

In the present solution, a soldering groove structure is formed at the end surface of the electrode tube, and the conventional sealing position is transferred from the electrode tube wall to the nozzle opening, and the diameter of the nozzle is large, which greatly facilitates soldering and sealing.

Moreover, the solder melts and completes the sealing substantially in the weld groove without requiring a relatively long flow to the electrode tube wall to complete the sealing.

In addition, the solder can be reduced in length from the arc high temperature region compared to the prior art soldering process, which contributes to some applications where the arc tube scale 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.

Further, the electrode assembly comprises a tungsten core rod, a conductive rod and a lead connected in sequence, and the tungsten core rod extends into the discharge chamber, the conductive rod is located in the inner tube section, and the outer diameter of the conductive rod is equal to the inner diameter of the inner tube section. The leads are connected to the ends of the conductive rods and extend out of the electrode tubes through the solder in the solder bath.

Alternatively, the electrode assembly includes a tungsten core rod, a conductive rod and a conductive tube which are sequentially connected, the tungsten core rod extends into the discharge chamber, the conductive rod is located in the inner tube portion, and the outer diameter of the conductive rod is equal to the inner diameter of the inner tube portion. The conductive tube is connected to the end of the conductive rod and passes through the solder in the soldering groove to protrude from the outside of the electrode tube to be in contact with the lead.

The leads are connected to the ends of the conductive rods and extend out of the electrode tubes through the solder in the solder bath. Since the inner wall of the electrode tube has no soldering function, the electrode tube and the electrode assembly can reduce the gap as much as possible to block the loss of mercury and halide into the gap of the electrode tube.

Further, the conductive rod is a cermet rod. Since the cermet rod portion is mainly in the inner tube section, its function is to carry current and effectively block the conduction of heat. A lead is added for connection to an external circuit. The expansion coefficient of the cermet rod is very close to that of the electrode tube, and the electrode tube can be effectively prevented from being broken or gap due to the inconsistent expansion coefficient of the electrode tube or the conductive rod. The smaller gap effectively prevents the loss of luminescent substances caused by luminescent substances such as halides and mercury entering the gap, and the resulting reduction in efficacy and color change of light.

The end of the conductive rod is provided with a boss structure that is matched with the welding groove. When sealing, the electrode assembly is inserted into the electrode tube. Due to the structure of the boss, the electrode assembly can be well positioned at the preset position, and after filling, the filler is filled into the solder tank. In this solution, The solder is not filled in the gap between the electrode assembly and the electrode tube, and the complexity of the sealing process can be effectively reduced.

The top of the boss structure is formed with a plurality of tapered surfaces to make it easier for the solder to wet the solder bath and the electrodes.

Further, in order to prevent the solder from falling off after the aging of the solder, the soldering groove has an outwardly constricted structure, and the shrinking structure applies an axial pressure to the overall structure of the solder, which can effectively prevent the solder from falling off.

Further, the welding groove may have a truncated cone structure or a spherical structure.

Similarly, a plurality of concave/convex groove structures may be disposed on the side of the welding groove, and the groove/groove structure has a gripping force on the whole solder, which can effectively prevent the solder from falling off after the aging of the solder.

Further, the weld groove has an inner diameter of 1 to 4 mm, a depth of 1-4 mm, and an inner tube inner diameter of 0.4 to 1.5 mm.

The connection between the outer curved surface of the discharge chamber and the electrode tube is a smooth transition structure, avoiding acute angular curvature to reduce the stress of the ceramic lamp.

Compared with the prior art, the present invention has the following advantages and beneficial effects:

The invention realizes the transfer of the conventional sealing position from the electrode tube wall to the nozzle by forming a welding groove structure at the end surface of the electrode tube, and the diameter of the nozzle is large, which greatly facilitates the soldering and the sealing.

附图说明 DRAWINGS

Figure 1 is a cross-sectional view of a prior art ceramic lamp;

Figure 2 is a cross-sectional view showing a ceramic lamp housing of the present invention;

Figure 3 is a cross-sectional view of a ceramic lamp without a boss structure;

Figure 4 is a cross-sectional view of a ceramic lamp having a boss structure of a truncated cone type;

Figure 5 is a cross-sectional view of a ceramic lamp having a square structure;

Fig. 6 is a cross-sectional view showing the ceramic lamp of the second embodiment.

具体实施方式 detailed description

The present invention will be described in detail below with reference to the embodiments and the accompanying drawings.

Example 1

As shown in FIG. 2 to FIG. 5, the present invention discloses a high-efficiency ceramic lamp comprising a discharge chamber 18, an electrode tube 15 disposed on both sides of the discharge chamber 18, and an electrode assembly extending into the discharge chamber 18 through the electrode tube 15. The electrode tube 15 includes a connecting inner tube portion 19 and a welding groove 13, the inner tube portion 19 is close to the discharge chamber 18, the welding groove 13 is located at the end surface, and the inner diameter of the welding groove 13 is larger than the inner tube portion 19, and the welding groove 13 is filled with the solder 12 A hermetic seal of the discharge chamber 18 is achieved. The discharge chamber 18 and the electrode tube 15 are made of a transparent ceramic material.

In the present solution, a welding groove 13 is formed at the end surface of the electrode tube 15, and the conventional sealing position is transferred from the electrode tube wall to the nozzle, and the diameter of the nozzle is large, which greatly facilitates soldering and sealing. . In addition, the solder can be reduced in length from the arc high temperature region compared to the prior art soldering process, which contributes to some applications where the arc tube scale is required to be shorter. The cold end position 20 of this solution 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 intersection of the inner wall of the discharge chamber and the electrode tube is generally the coldest surface in the discharge chamber due to the farthest distance from the arc and the electrode tip, and is often referred to as the cold end.

The electrode assembly includes a tungsten core rod 16 connected in sequence, a conductive rod 14 and a lead wire 11. The tungsten core rod 16 extends into the discharge chamber 18, the conductive rod 14 is located in the inner tube portion 19, and the outer diameter and the inner diameter of the conductive rod 14 The inner diameter of the pipe section 19 is equivalent, and the lead wire 11 is connected to the end of the conductive rod 14 and passes through the solder in the welding groove 13 to protrude outside the electrode tube 15. Since the wall 15 of the electrode tube has no soldering function, the electrode tube 15 and the electrode assembly can reduce the gap as much as possible to block the loss of mercury and halide into the gap of the electrode tube 15. The inner wall of the electrode tube 15 can be precisely machined, and the outer surface of the conductive rod 14 is processed, and the gap between them can be controlled to an accuracy of less than 2 micrometers. Such precision is advantageous for increasing the life of the ceramic lamp and increasing the coaxiality of the electrode assembly during the lamp making process, ensuring that the arc is at the center of the ceramic lamp. Avoiding deviated arcs can cause isothermal deviations from the ceramic lamps, and even local overheating of the lamps can affect the use and life of the lamps.

Further, the conductive rod 14 is a cermet rod. A lead 11 is added for connection to an external circuit. The expansion coefficient of the cermet rod is very close to that of the electrode tube 15, and it is possible to effectively prevent the electrode tube 15 from being broken or having a gap due to the inconsistent expansion coefficient of the electrode tube 15 or the conductive rod 14.

The end of the conductive rod 14 is provided with a boss structure 17 which is positioned in cooperation with the welding groove 13. When sealing, the electrode assembly is inserted into the electrode tube 15. Due to the action of the boss structure 17, the electrode assembly can be well positioned at the preset position, and after the insertion, the filler 12 is filled into the solder bath 13, and the lead is filled. 11 passes through the solder 12 again. In this solution, since the solder 12 is not filled in the gap between the electrode assembly and the electrode tube 15, the complexity of the sealing process can be effectively reduced.

The top of the boss structure 17 is formed with a plurality of tapered surfaces to make it easier for the solder to wet the solder bath and the electrodes. The boss structure 17 can be in the form of a truncated cone or a square.

Further, in order to prevent the solder 12 from falling off after the aging of the solder 12, the soldering groove 13 has an outwardly constricted structure, and the shrinking structure applies an axial pressure to the overall structure of the solder 12, which can effectively prevent the solder from falling off.

Further, the welding groove 13 may have a truncated cone structure or a truncated cone or a spherical structure.

Similarly, a plurality of concave/convex groove structures may be disposed on the side of the soldering groove 13. The groove/groove structure has a gripping force on the solder as a whole, and can effectively prevent the solder 12 from falling off after being aged.

Further, the welding groove 13 has an inner diameter of 1 to 4 mm, a depth of 1-4 mm, and an inner tube 19 having an inner diameter of 0.4 to 1.5 mm.

The joint 21 of the outer curved surface of the discharge chamber 18 and the electrode tube 15 is a smooth transition structure, avoiding an acute angle curvature to reduce the stress of the ceramic lamp arc tube.

Example 2

As shown in FIG. 6, the embodiment is similar to the structure of Embodiment 1, except that the electrode assembly includes a tungsten core rod 16, a conductive rod 14 and a conductive tube 22 which are sequentially connected, and the tungsten core rod 16 extends into the same. In the discharge chamber 18, the conductive rod 14 is located in the inner tube section 19, and the outer diameter of the conductive rod 14 is equivalent to the inner diameter of the inner tube portion 19, and the conductive tube 22 is connected to the end of the conductive rod 14 and extends through the solder 12 in the welding groove 13. The outer electrode tube 15 is connected to the lead 11 outside.

Claims

An efficient ceramic lamp comprising a discharge chamber, an electrode tube disposed on both sides of the discharge chamber, and an electrode assembly extending into the discharge chamber through the electrode tube, wherein the electrode tube comprises a connected inner tube segment and a welding groove, wherein the electrode tube The pipe section is close to the discharge cavity, the welding groove is located at the end face, and the inner diameter of the welding groove is larger than the inner pipe section, and the welding groove realizes the hermetic sealing of the discharge cavity by filling the solder.
The high-efficiency ceramic lamp of claim 1 , wherein the electrode assembly comprises a tungsten core rod, a conductive rod and a lead connected in sequence, the tungsten core rod extending into the discharge chamber, the conductive rod being located in the inner tube section, and The outer diameter of the conductive rod is equivalent to the inner diameter of the inner tube section, and the lead is connected to the end of the conductive rod and extends out of the electrode tube through the solder in the soldering groove.
The high-efficiency ceramic lamp according to claim 1, wherein the electrode assembly comprises a tungsten core rod, a conductive rod and a conductive tube which are sequentially connected, and the tungsten core rod extends into the discharge chamber, and the conductive rod is located in the inner tube portion. And the outer diameter of the conductive rod is equivalent to the inner diameter of the inner tube segment, and the conductive tube is connected to the end of the conductive rod and passes through the solder in the soldering groove to protrude outside the electrode tube to be in contact with the lead.
The high efficiency ceramic lamp of claim 2 wherein the electrically conductive rod is a cermet rod.
The high-efficiency ceramic lamp according to claim 2, wherein the end of the conductive rod is provided with a boss structure that is matched with the welding groove.
The high-efficiency ceramic lamp of claim 5, wherein the top of the boss structure is formed with a plurality of tapered faces.
The high-efficiency ceramic lamp according to claim 1, wherein the welding groove has an outwardly constricted structure or a plurality of concave/convex grooves are formed on the side of the welding groove.
The high-efficiency ceramic lamp according to claim 7, wherein the welding groove has a truncated cone structure or a truncated cone or a spherical structure.
The high efficiency ceramic lamp of claim 1 wherein the weld groove has an inner diameter in the range of 1 to 4 mm, a depth of 1-4 mm, and an inner tube inner diameter in the range of 0.4 to 1.5 mm.
The high-efficiency ceramic lamp according to any one of claims 1 to 9, characterized in that the connection between the outer curved surface of the discharge chamber and the electrode tube is a smooth transition structure.