CN203013676U

CN203013676U - Arc tube for medium-and-high-power metal halide discharge lamp

Info

Publication number: CN203013676U
Application number: CN 201220697463
Authority: CN
Inventors: 俞明忠; 曹茂军; 施振家; 陈晖�
Original assignee: NINGBO YAMAO LIGHTING ELECTRIC APPLIANCES CO Ltd
Current assignee: Ningbo Yamao Optoelectronics Co Ltd
Priority date: 2012-12-17
Filing date: 2012-12-17
Publication date: 2013-06-19
Anticipated expiration: 2022-12-17

Abstract

An arc tube for medium-and-high-power metal halide discharge lamps is provided. According to the arc tube, a main tube in the middle and tail tubes at two ends are fused into an integral, wherein the diameter of the main tube is larger than that of each tail tube; the main tube is connected with an exhaust pipe, and is filled with rare earth light-emitting material; electrode assemblies are press sealed on the tail tubes at the two ends; an outer surface of each press seal is coated with a heat-insulation layer; and a starting electrode is press sealed on one tail tube. The diameter of the main tube : the diameter of each tail tube = 2-3:1, and arc-shaped transition is arranged between the main tube and the tail tubes. The arc tube is reasonable is shape design, good in appearance and easy to process; the main tube in the middle is long and large, and thus discharge cavity volume is increased, deposition of halide is reduced, discharge arc is stabilized and luminous efficiency and color rendering are improved. The arc-shaped smooth transition between the main tube and the tail tubes shortens press seal lines and eliminates press seal blind angles as well; the arc line is smooth, the temperature distribution is uniform, light and color are consistent, and the color rendering index is improved by 35 percents. One tail tube is provided with not only a rare earth electrode but also the starting electrode, and thus the arc tube is convenient to start, 45 percents of electrode energy consumption is reduced, and service life is prolonged.

Description

Middle high-power metal halide discharge lamp electric arc tube

Technical field

The utility model relates to the important critical component in a kind of high-pressure discharge lamp, particularly middle high-power metal halide discharge lamp electric arc tube.

Background technology

Electric arc tube is the important critical component in high-pressure discharge lamp, and the quality of its quality directly affects quality and the useful life of high-pressure discharge lamp.China Patent No. 200920304760.6 " middle high-power metal halide lamp arc pipe ", though a kind of cell-shell that is formed by connecting by the quartz ampoule of three sections straight pipe types also is provided, the centre is discharge part, two ends are electrode package section, and mid diameter reduces the envelope line ball of electric arc tube, area of dissipation greater than the two ends diameter, thereby thermal conductance, thermal radiation loss are greatly reduced, improve light efficiency, extended useful life.

But the shape of this electric arc tube is also undesirable, has some defectives, and as its cold junction shape point too, its area of dissipation reduces too much and to raise too much with the temperature at position so far, makes quartzy tube wall crystalline substance easy to break breakdown, directly affects its useful life.

Summary of the invention

Technical problem to be solved in the utility model is: a kind of middle high-power metal halide discharge lamp electric arc tube is provided, startability is good, and the electric arc tube shape is more rational, easily make processing, greatly improve light efficiency and the color rendering index of electric arc tube, uniformity of temperature profile, have a narrow range of temperature, reduce energy loss, also increase the service life.

the technical scheme in the invention for solving the above technical problem is: middle high-power metal halide discharge lamp electric arc tube, the integral body that is fused into by supervisor and the two ends tail pipe of centre forms, and predominant tube diameter is greater than the tail pipe diameter, be connected with blast pipe on supervisor, be filled with rare earth luminescent material, on the tail pipe of two ends, press seal has electrode assemblie, the outer surface at envelope pressure place applies heat-insulation layer, go back press seal on a described tail pipe starting electrode is arranged, described predominant tube diameter: tail pipe diameter=1:0.5～0.8, supervisor's length: tail pipe length=2～3:1, described supervisor, circular arc transition between tail pipe.

Compared with prior art, the utility model has the advantage of: this electric arc tube shape design is more reasonable, and the external form sense organ is good, easily make processing, middle supervisor is long and large, has increased the volume of discharge cavity, reduce halid deposition, stable discharging electric arc has improved light efficiency and color rendering.Circular arc smooth transition between main, tail pipe has shortened the press seal line and has eliminated again the press seal dead angle, and arc line is straight, uniformity of temperature profile, photochromic consistent, has guaranteed the raising of electric arc tube cold junction temperature, greatly improves color rendering index.starting electrode wherein also is installed except rare earth element electrode in a tail pipe, be convenient to quickly starting, shortening is from glow discharge to the time between arc discharge, reduced by 45% electrode energy loss, move on press seal line because of tail pipe, area of dissipation reduces, thereby reduced hot conduction, the loss of thermal radiation, the electric arc tube working temperature is improved, the metal halide that participates in discharge is fully gasified, light efficiency is remarkable, improve 20～35%, the colour temperature changing value is controlled in 4000 ± 300K, rare earth element electrode and molybdenum lead-out wire effectively connect, the blanketing gas of guaranteeing electric arc tube does not leak, molybdenum lead-out wire and press seal end metal position are filled with resistant to elevated temperatures glass cement, effectively improve the useful life of discharge light with metal halide.

Description of drawings

Accompanying drawing 1, structural representation of the present utility model.

Embodiment

1 couple of embodiment of the present utility model is described in further detail below in conjunction with accompanying drawing.

Adopt the quartz glass tubing of low hydroxyl 1-2PPm dosage, be made into collapsible tube small in ends broad in the middle, namely the supervisor 1 by the centre is fused into for the glass tube of diameter greater than symmetrical tail pipe 7 diameters in two ends.

The center line of supervisor 1, tail pipe 7 is on same axis, it is round and smooth circular arc transition between two pipes, supervisor is the arc discharge chamber, the electrode assemblie of electron emission by rare earth element electrode 2, molybdenum sheet 5, draw wire 4 and form, symmetrical press seal is in the center of two ends tail pipe, wherein going back press seal in a tail pipe has starting electrode 3 to be anode, there is no the negative electrode that is of press seal starting electrode 3.

For improving the temperature of electronics end cold junction, apply heat-insulation layer 6 on the outer surface of two ends tail pipe 7 electrode assemblie sealing-ins place, heat-insulation layer 6 is the aluminium oxide heat-insulation layer, and makes predominant tube diameter: tail pipe diameter=1:0.5～0.8, supervisor's length: tail pipe length=2～3:1.

Be responsible on 1 and fill in addition rare earth luminescent material 8, liquid mercury, vacuumize the blast pipe 9 of use.

Also be filled with the metal halide material in supervisor's discharge cavity, start gas, also must carry out vacuum treatment by blast pipe 9, rush argon gas and clean, be filled with at last quantitative protective gas and carry out sealed-off, be made into the discharge light with metal halide electric arc tube.

The above-mentioned electric arc tube of making can be enclosed in different big or small outer glass cell-shells as required and be made, high-power metal halide discharge lamp in 1 500W, 2000W, 4000W or 175W, 250W, 400W, for fishing or plant growth lighting, irradiation, and can reach the secondary national standard of energy efficiency.

Claims

1. high-power metal halide discharge lamp electric arc tube in a kind, supervisor (1) by the centre forms with the integral body that two ends tail pipe (7) is fused into, and supervisor's (1) diameter is greater than tail pipe (7) diameter, be connected with blast pipe (9) on supervisor (1), be filled with rare earth luminescent material (8), the upper press seal of two ends tail pipe (7) has electrode assemblie, the outer surface at envelope pressure place applies heat-insulation layer (6), it is characterized in that going back on a described tail pipe (7) press seal starting electrode (3) is arranged, described predominant tube diameter: tail pipe diameter=1:0.5～0.8, supervisor's length: tail pipe length=2～3:1, described supervisor (1), circular arc transition between tail pipe (7).

2. middle high-power metal halide discharge lamp electric arc tube according to claim 1, it is characterized in that described electrode assemblie by rare earth element electrode (2), molybdenum sheet (5), draw wire (4) and form, press seal is in the center of two ends tail pipe, and wherein going back press seal in a tail pipe (7) has starting electrode (3).

3. middle high-power metal halide discharge lamp electric arc tube according to claim 1, is characterized in that described coating heat-insulation layer (6) is the aluminium oxide heat-insulation layer.