WO2013075528A1

WO2013075528A1 - Discharging ceramic container and metal halide lamp

Info

Publication number: WO2013075528A1
Application number: PCT/CN2012/080995
Authority: WO
Inventors: 魏颖东
Original assignee: 上海亚明照明有限公司
Priority date: 2011-11-24
Filing date: 2012-09-05
Publication date: 2013-05-30
Also published as: CN102496557B; CN102496557A

Abstract

A discharging ceramic container, comprising a discharging main tube and two capillaries (2) connected to the two ends of the discharging main tube, one electrode (5) being provided in each of the capillaries (2). The discharging main tube comprises a bulged section (3) in the middle and cylindrical sections (1) at the two ends, and the bulged section (3) is smoothly connected to the cylindrical sections (1). The bottom of the bulged section (3) is flush with the cylindrical section (1), and the top of the bulged section (3) is higher than the top of the cylindrical sections (1). The discharging ceramic container has an asymmetric discharging cavity (4), which guarantees good electro-optical parameters while effectively avoids overheating at the middle part of the upper tube wall of the discharging cavity (4) during ignition, thereby eliminating the deformation of the tube wall and improving the reliability and safety thereof. Also disclosed is a metal halide lamp made from the discharging ceramic container.

Description

Ceramic discharge vessel and metal halide lamp

The invention designs a high intensity discharge lamp, in particular to a ceramic discharge vessel and a metal halide lamp made thereof. Background technique

Due to the growing demand for energy efficient lighting systems, metal halide lamps with ceramic discharge vessels are increasingly being used for interior and exterior lighting. As is well known, such lamps include a ceramic discharge chamber in which a pair of electrodes are disposed, which is typically a symmetrical rotating body such as a cylinder, a sphere or an ellipsoid.

Chinese patent CN101436516A discloses a ceramic discharge tube metal halide lamp. The ceramic discharge tube metal halide lamp forms a discharge chamber in the discharge tube, and the discharge chamber is filled with an inert gas (such as Xenon Xe) and an ionizable salt. A pair of electrodes are placed in the discharge chamber at the two ends of the ceramic discharge tube, and the two electrodes The tips have a spacing to form a discharge path therebetween. The appearance of the ceramic discharge tube of the conventional ceramic metal halide lamp is a symmetrical rotating body (as shown in Figs. 1 and 2).

In order to improve the luminous efficiency of the metal halide lamp of the ceramic discharge tube, a high-efficiency ceramic discharge vessel metal halide lamp is often used. As shown in FIG. 3, the ceramic discharge vessel usually adopts a slender ceramic tube body, and the mechanism is adopted. Although ceramic discharge vessels can achieve high light efficiency, they also have certain disadvantages. Chinese patent CN1364308 discloses a ceramic discharge chamber of a metal halide lamp. First of all, the slender ceramic tube has a small inner diameter and a large wall load. When the horizontal ignition point is performed, the arc bending causes the temperature of the central portion of the upper tube wall of the discharge chamber to be too high, thereby causing degeneration of the tube wall of the ceramic tube body. This can cause breakage and affect product reliability and safety.

The fillers in metal halide lamps currently in common use are generally metal halide series containing rare earth metals such as DyI3, HoI3, TmI3, etc., although these metal halides can impart superior color rendering properties to lamps, due to these metal halides. It is highly corrosive at high temperatures and affects the light source maintenance and ignition life of the source, so it is not the most suitable filler choice. Summary of the invention

SUMMARY OF THE INVENTION The problem to be solved by the present invention is to provide a ceramic discharge vessel and a metal halide lamp produced therewith which overcome the above problems in the prior art.

A ceramic discharge vessel includes a discharge main pipe and two capillary tubes connected to both ends of the discharge main pipe, and each of the two capillary tubes is provided with an electrode, and the discharge main pipe includes an intermediate drum portion and a cylindrical portion at both ends, and the drum Starting section and cylindrical section Sleek connection, the bottom of the bulging section is flush with the cylindrical section, and the top of the bulging section is higher than the top of the cylindrical section. The discharge cavity formed in the ceramic discharge vessel has an upwardly convex space in the middle, so that the discharge cavity is an asymmetrical ceramic cavity, which ensures the good photoelectric parameters while effectively avoiding the temperature of the central portion of the upper end wall of the discharge cavity when the ignition point is avoided. High, thereby eliminating tube wall denaturation of the ceramic tube body, improving its reliability and safety.

The ratio of the length of the bulging section to the length of the discharge main pipe of the present invention is between 0.2 and 1; preferably, it is between 0.3 and 1.

The ratio of the inner diameter of the cylindrical section of the present invention to the maximum internal diameter of the bulging section is between 0.4 and 1; preferably, it is between 0.7 and 0.9.

The ratio of the maximum inner diameter of the bulge section of the present invention to the distance between the inner ends of the two electrodes is between 0.18 and 0.5; preferably, it is between 0.2 and 0.4.

The shape of the top of the bulging section of the present invention is spherical, ellipsoidal or partially ellipsoidal.

The length A of the bulging section of the present invention, the length 8 of the discharge main pipe, the inner diameter C of the capillary tube, the inner diameter D of the cylindrical section, the maximum inner diameter 5 of the bulging section, the distance L between the inner ends of the two electrodes, the bulging section The maximum radius J of the upper half, the radius H of the lower half of the bulging section, the lateral width F of the upper half of the bulging section, and the lateral width G of the lower half of the bulging section satisfy the following relationship: 0.2<A/B<1, 0.4<D /E<1, 0.18<E/L<0.5, J>H, F=G; Preferably, 0·3<Α/Β<1, 0.7<D/E<0.9, 0.2<E/L<0.4.

The discharge main body of the present invention is filled with a metal halide, and the metal halide includes Nal and another halide combination X, and the halide combination X is one or more of GdI3, CeI3, ErI3 and EuI3. Wherein the molar ratio of Nal/X is between 4 and 18; preferably, the molar ratio of Nal/X is between 5 and 16; further preferably, the molar ratio of Nal/X is between 6 and Further, the halide combination X is a mixture of ErI3 and CeI3, wherein the molar ratio of ErI3/CeI3 is between 0.2 and B 2; further preferably, the halide combination X is Further, the metal halide further includes T1I, Mn1 or CsI2.

The invention also discloses a metal halide lamp comprising a quartz tube, wherein the quartz tube is provided with two external electrodes, wherein the quartz tube is provided with the above ceramic discharge vessel, and the two electrodes in the ceramic discharge vessel are respectively The two outer electrodes are connected.

According to the above technical solution, the ceramic discharge vessel and the metal halide lamp of the present invention have the following beneficial effects: (1) Since the ceramic discharge vessel of the present invention is provided with a bulging section which is convex toward one side, a ceramic discharge vessel is formed. The discharge chamber is bulged upward in the middle, so that the wall above the center of the ceramic discharge vessel is far away from the upper arch arc generated by the discharge of the two electrodes, so that the wall temperature in the middle of the ceramic discharge vessel is not too high, and the ceramic discharge can be effectively prevented. The capacitor is broken. At the same time, the structure does not reduce the temperature at both ends of the discharge main pipe, so that the filler maintains a high vapor pressure, which can ensure the excellent luminous efficiency and color reduction of the ceramic discharge vessel metal halide lamp. Its reliability and security. (2) The metal halide in the ceramic discharge vessel of the present invention does not cause strong corrosivity at high temperatures, and can provide more than 110 lumens/ The high luminous efficiency of the white light ensures the lumen maintenance and life of the light source. Its luminous flux maintenance rate can be maintained above 100% in 2000 hours, above 95% in 5000 hours, and with more than 20,000 hours. life. DRAWINGS

BRIEF DESCRIPTION OF THE DRAWINGS Fig. 1 is a schematic view showing the shape of a rotary body symmetric ceramic discharge vessel of a conventional metal halide lamp; Fig. 2 is a schematic view showing the shape of another embodiment of a rotary body symmetric ceramic discharge vessel of a conventional metal halide lamp; Schematic diagram of a conventional elongated ceramic discharge vessel metal halide lamp ceramic discharge vessel;

Figure 4 is a schematic view showing the shape of a ceramic discharge vessel of the present invention;

Figure 5 is a schematic view showing the dimensional ratio of the ceramic discharge vessel of the present invention;

Figure 6 is a cross-sectional view taken along line 图 in Figure 5;

Figure 7 is a schematic view showing the structure of a metal halide lamp of the present invention.

detailed description

The preferred embodiments of the present invention are described in detail below with reference to the accompanying drawings.

As shown in FIG. 4, a ceramic discharge vessel of the present invention comprises a discharge main pipe and two capillaries 2 connected to both ends of the discharge main pipe, one electrode is disposed in each of the two capillaries, and the discharge main pipe includes an intermediate swollen section 3 And the cylindrical section 1 at both ends, the bulging section 3 is smoothly connected with the cylindrical section 1, the bottom of the bulging section 3 is flush with the cylindrical section, and the top of the bulging section 3 is higher than the top of the cylindrical section 1. The discharge chamber 4 formed in the discharge main pipe has an upwardly convex space in the middle, so that the discharge chamber is an asymmetrical ceramic cavity, and the temperature of the central portion of the upper end wall of the discharge chamber is excessively high while ensuring good photoelectric parameters while effectively avoiding the ignition point. , thereby eliminating the wall denaturation of the ceramic tube body, improving its reliability and safety.

The top of the bulging section 1 in the center of the discharge main pipe may have a shape of a spherical shape, an elliptical shape or a partial elliptical shape, which effectively enlarges the distance between the top tube wall and the electrode.

As shown in Fig. 5, the length of the drum section is A, the length of the discharge main pipe is B, the inner diameter of the ceramic capillary is (:, the inner diameter of the cylindrical section is 0, the maximum inner diameter of the bulging section is E, and the inner ends of the two electrodes The distance between the above parameters is L, then the above parameters should satisfy the following relationship: 0. 2<A: B<l is preferably 0. 3<A: B<l; 0. 4<D: E<l is preferably 0. 7<D: E<0. 9; 0. 18<E: L<0. 5 Preferred 0. 2<E: L<0.4. The ceramic discharge tube fabricated by satisfying these relations has the following excellent characteristics. : The cold end of the discharge tube maintains a high temperature to maintain the high luminous efficiency of the metal halide lamp and superior color reduction, and the temperature at the top of the discharge tube is controlled to a suitable position to avoid cracking of the ceramic tube due to arcing.

As shown in Fig. 6, the maximum radius J of the upper half of the bulging section, the radius H of the lower half of the bulging section, the lateral width F of the upper half of the bulging section, and the lateral width G of the lower half of the bulging section satisfy the following relationship: J 〉H, F=G=H=D/2. The discharge main body is filled with a metal halide including Nal and another halide combination X, and the halide X includes one or more of GdI3, CeI3, ErI3 and EuI3, wherein the molar ratio of Nal/X Located between 4 and 18. The above filler does not produce strong corrosivity at high temperatures, is suitable for use in high-efficiency ceramic metal halide lamps, and can provide high-efficiency white light above 110LPW, and its color rendering index CRI is higher than 70, which has good display. Chromaticity and stable color temperature.

Preferably, the molar ratio of Nal/X is between 5 and 16. Still further preferably, the molar ratio of Nal/X may be between 6 and 14.

The above ratio can further improve the stability of the color temperature, and has a better effect of reducing corrosion, thereby improving the luminous flux maintenance ratio of the light source. The above halide X may be a mixture of ErI3 and CeI3, wherein the molar ratio of ErI3/Cel3 is between 0.2 and 2, and the halide X may also be a mixture of ErI3, CeI3 and GdI3.

Further, the metal halide further includes T1I, which can improve the light effect of the metal halide lamp; the metal halide further includes MnI2 or CsI2, which can further improve the color development of the metal halide lamp. As shown in FIG. 7, a metal halide lamp manufactured by using the above ceramic discharge vessel includes a quartz tube 6, a ceramic discharge vessel is disposed in the quartz tube 6, a discharge chamber 4 is formed in the ceramic discharge vessel, and an ionization chamber is disposed in the discharge chamber 4. a filler such as a substance. The filling includes one or more of an ionizable material such as metallic mercury, a rare gas, and various types of metal halides. The ceramic discharge vessel comprises a discharge main pipe 1 and two ceramic capillary tubes 2 respectively located at both ends of the discharge main tube, and the two electrodes 5 respectively pass through the two ceramic capillary tubes 2 and protrude into the discharge chamber 4, and the outer ends of the two ceramic capillary tubes Sealed by sealing solder, the two electrodes 5 are opposed to each other, the outer ends of the two electrodes 5 are respectively connected to the outer electrodes on the quartz tube 6, and the outer electrodes are connected to the power source to energize the two electrodes, and the discharge between the two electrodes is generated. The arc illuminates. The discharge main pipe comprises an intermediate bulging section 3 and a cylindrical section 1 at both ends, the bulging section 3 is smoothly connected with the cylindrical section 1, the bottom of the bulging section 3 is flush with the cylindrical section, and the top of the bulging section 3 is higher than the cylindrical section 1. At the top, the wall above the center of the discharge main pipe is far away from the upper arch arc generated by the discharge of the two electrodes, so that the temperature of the top tube wall in the middle of the ceramic discharge tube is not too high, and the breakage of the ceramic discharge vessel can be effectively prevented.

The top of the bulging section in the center of the discharge main pipe may be elliptical or the like, and the shape of the upper portion of the pipe wall and the electrode connection distance can be effectively enlarged. As shown in Fig. 5 and Fig. 6, the length of the drum section is A, the length of the discharge main pipe is B, the inner diameter of the ceramic capillary is (:, the minimum inner diameter of the discharge main pipe is 0, and the maximum inner diameter of the discharge main pipe is 5, two The distance between the electrodes is L, the maximum radius J of the upper half of the bulging section, the radius H of the lower half of the bulging section, the lateral width F of the upper half of the bulging section, and the lateral width G of the lower half of the bulging section. The parameters should satisfy the following relationship: 0. 2<A: B<l, 0. 4<D: E<1, 0. 18<E: L<0. 5, J>H, F=G. Preferably, 0.3<A/B<1, 0.7<D/E<0.9, 0.2<E/L<0.4, J>H, F=G=H=D/2. Since the metal halide lamp is provided with a bulging section in the middle of the ceramic discharge vessel, the discharge cavity formed by the ceramic discharge vessel bulges outward in the middle, so that the top pipe wall in the middle of the ceramic discharge vessel is separated from the upper arch arc generated by the discharge of the two electrodes. Far, in this way, the temperature of the tube wall in the middle of the ceramic discharge vessel is not too high, and the breakage of the ceramic discharge vessel can be effectively prevented. Table 1 below compares the two embodiments of the present invention with the current conventional high efficiency metal halide lamps, wherein temperature 1: the temperature above the central bulge of the horizontal igniting tube wall; temperature _{2: the} highest temperature below the horizontal igniting tube wall.

Table 1 It can be seen from the above table that the metal halide lamp adopting the structure can achieve the purpose of lowering the temperature of the upper wall of the ceramic discharge tube, and the temperature of the lower surface of the ceramic tube does not change much to ensure the higher vapor pressure of the filler. The excellent parameters of the light source, it can be seen that the shape of the ceramic discharge vessel of the present invention can effectively reduce the highest temperature in the center of the pipe body under the premise of maintaining high luminous efficiency, and greatly enhance the reliability of the lamp.

In this specification, the term "ceramic" is understood to mean a high-strength, high-temperature and corrosion-resistant load-bearing material, including single crystal metal oxides (such as sapphire), polycrystalline metal oxides (such as polycrystalline alumina and Cerium oxide) and polycrystalline non-oxide materials (such as aluminum nitride). These materials are generally capable of withstanding temperatures of 1500 to 1700 K and are resistant to chemical attack by halides and Na. The ceramic capacitor of the present invention also refers to a polycrystalline alumina (PCA).

The filler in the metal halide lamp comprises Nal and another halide combination X, and the halide X is one or more of GdI3, CeI3, ErI3 and EuI3, wherein the molar ratio of Nal/X is between 4 and 18. Preferably, the molar ratio of Nal/X is between 5 and 16; still further preferably, the molar ratio of Nal/X may be between 6 and 14. The above filler does not produce strong corrosiveness at high temperatures, is suitable for use in high-efficiency ceramic metal halide lamps, and can provide high-efficiency white light higher than 110LPW, and has a color rendering index CRI higher than 70, and has good color development. Sexual and stable color temperature.

The above halide X may be a mixture of ErI3 and CeI3, wherein the molar ratio of ErI3/Cel3 is between 0.2 and 2, and the halide X may also be a mixture of ErI3, CeI3 and GdI3. Further, in order to further improve the light effect of the metal halide lamp, T1I may be added to the filler, and in order to further improve the color development of the metal halide lamp, MnI2 or CsI2 may be added to the filler. The buffer gas of the metal halide lamp can be selected from helium gas to improve the light efficiency and improve the luminous flux maintenance rate.

Claims

Claim

A ceramic discharge vessel comprising a discharge main pipe and two capillary tubes connected to both ends of the discharge main pipe, wherein each of the two capillary tubes is provided with an electrode, wherein the discharge main pipe includes an intermediate drum portion and two ends The cylindrical section, the bulging section is smoothly connected with the cylindrical section, the bottom of the bulging section is flush with the cylindrical section, and the top of the bulging section is higher than the top of the cylindrical section.

2. The ceramic discharge vessel according to claim 1, wherein a ratio of a length of the bulging section to a length of the discharge main pipe is between 0.2 and 1.

3. The ceramic discharge vessel according to claim 2, wherein a ratio of a length of the bulging section to a length of the discharge main pipe is between 0.3 and 1.

4. The ceramic discharge vessel according to claim 1, wherein a ratio of an inner diameter of the cylindrical section to a maximum inner diameter of the bulging section is between 0.4 and 1.

The ceramic discharge vessel according to claim 4, wherein a ratio of an inner diameter of the cylindrical section to a maximum inner diameter of the bulging section is between 0.7 and 0.9.

6. The ceramic discharge vessel according to claim 1, wherein a ratio of a maximum inner diameter of the bulging section to a distance between inner ends of the two electrodes is between 0.18 and 0.5.

The ceramic discharge vessel according to claim 6, wherein a ratio of a maximum inner diameter of the bulging section to a distance between inner ends of the two electrodes is between 0.2 and 0.4.

The ceramic discharge vessel according to claim 1, wherein the shape of the top of the bulging section is spherical, ellipsoidal or partially ellipsoidal.

9. The ceramic discharge vessel according to claim 1, wherein the length A of the bulging section, the length B of the discharge main pipe, the inner diameter C of the capillary, the inner diameter D of the cylindrical section, and the maximum inner diameter E of the bulging section , the distance L between the inner ends of the two electrodes, the maximum radius J of the upper half of the bulging section, the radius H of the lower half of the bulging section, the lateral width F of the upper half of the bulging section, and the lateral width G of the lower half of the bulging section The following relationship is satisfied: 0.2 < A / B < 1, 0.4 < D / E < 1, 0.18 < E / L < 0.5, J > H, F = G = H = D / 2.

The ceramic discharge vessel according to claim 9, wherein 0.3 < A / B < 1, 0.7 < D / E < 0.9, and 0.2 < E / L < 0.4.

The ceramic discharge vessel according to claim 1, wherein the discharge main pipe is filled with a metal halide.

The ceramic discharge vessel according to claim 11, wherein the metal halide comprises Nal and another halide combination X, and the halide combination X is one of GdI3, CeI3, ErI3, and EuI3. Or more, wherein the molar ratio of Nal/X is between 4 and 18. The ceramic discharge vessel according to claim 12, wherein said Nal/X molar ratio is between 5 and 16.

The ceramic discharge vessel according to claim 12, wherein said Nal/X molar ratio is between 6 and 14.

The ceramic discharge vessel according to claim 12, wherein the halide combination X is a mixture of ErI3 and CeI3, wherein the molar ratio of ErI3/CeI3 is between 0.2 and 2.

The ceramic discharge vessel according to claim 12, wherein said halide combination X is a mixture of ErI3, CeI3 and GdI3.

A ceramic discharge vessel according to claim 12, wherein said metal halide further comprises T1I, Mn1 or CsI2.

A metal halide lamp, comprising: a quartz tube; the quartz tube is provided with two external electrodes; the quartz tube is provided with the ceramic discharge vessel of claim 1, and the two electrodes of the ceramic discharge vessel are respectively The two outer electrodes are connected.