CN211295037U

CN211295037U - Electrode of ultra-high pressure mercury lamp

Info

Publication number: CN211295037U
Application number: CN202020229438.8U
Authority: CN
Inventors: 徐丽娜; 周晓华
Original assignee: Shanghai Y&l Lighting Co ltd
Current assignee: Shanghai Yaer Precision Parts Manufacturing Co ltd
Priority date: 2020-02-29
Filing date: 2020-02-29
Publication date: 2020-08-18
Anticipated expiration: 2030-02-28

Abstract

The utility model relates to an electrode of super high pressure mercury lamp, this electrode include integrated into one piece's electrode tip (1) and electrode rod (2), electrode tip (1) go up the cover and be equipped with metal coil (11), electrode rod (2) surface be equipped with be convenient for with glass sealing-in's big surface area coarse structure (21), the form of this coarse structure (21) includes screw thread, dull polish or nick. Compared with the prior art, the utility model has the advantages of guarantee sealing-in quality, workable, suitability are strong.

Description

Electrode of ultra-high pressure mercury lamp

Technical Field

The utility model belongs to the technical field of lighting apparatus and specifically relates to an electrode of super high pressure mercury lamp is related to.

Background

The ultra-high pressure mercury lamp is a gas discharge lamp, has small volume and high brightness, has the maximum mercury vapor pressure of 200atm during operation, is widely applied to projectors, stages, movies and television illumination, is also applied to industrial or commercial detection light sources, optical lofting and the like, and has high application value. In a gas discharge lamp, an arc tube is a key part of the lamp, and whether sealing between an electrode on the arc tube and glass is good is an important parameter influencing the quality of the arc tube, so the design of the electrode is a key part.

The straight rod part of the electrode of the existing ultra-high pressure mercury lamp is dielectric-free, as shown in figure 5. The sealing part between the dielectric-free electrode and the quartz tube is easy to be pressed and sealed not firmly, so that chronic air leakage is caused, photoelectric parameters of the lamp are influenced, and even more, the product is cracked, and the safety is influenced. Or the electrode with the thin spring is installed, as shown in fig. 6, although the sealing part between the electrode with the thin spring and the quartz tube is not easy to leak gas, the thin spring and the electrode rod are easy to break by the assembling process, and the rejection rate is high.

SUMMERY OF THE UTILITY MODEL

The object of the present invention is to provide an electrode for an ultra-high pressure mercury lamp, which ensures the sealing quality, is easy to process and has high applicability, in order to overcome the defects of the prior art.

The sealing between the electrode and the glass is often the key of the service life of the electrode, while the electrode and the glass are both bonded physically, but the bonding is still strong at room temperature, and if the bonding is carried out at a use temperature, the bonding is not firm, chronic air leakage and even lighting explosion occur, and the expansion coefficient of the tungsten electrode (α -4.6 × 10) originally is the expansion coefficient of the tungsten electrode (α -4.6 ×)^-6·K^-1) Much larger than the expansion coefficient of quartz glass (α -5.4 × 10)^-7·K^-1) When the temperature rises, the degree of expansion of both differs an order of magnitude for sealed good interface defect appears originally, leads to leaking gas, and utility model people through long-term research, discovery increase electrode bar's roughness, for example add means such as screw thread, dull polish or nick and can keep having more area of contact between electrode and the glass when the high temperature, and then possess good interface and combine, can alleviate gas leakage or stress concentration scheduling problem.

The purpose of the utility model can be realized through the following technical scheme:

the electrode of the ultra-high pressure mercury lamp comprises an electrode tip and an electrode rod which are integrally formed, wherein a metal coil is sleeved on the electrode tip, the surface of the electrode rod is provided with a rough structure which is convenient to seal with glass and used for increasing the surface area, and the form of the rough structure comprises threads, frosts or nicks.

Further, the length of the rough structure occupies 30-80% of the length of the electrode rod.

Further, the rough structure is a thread which is an external thread formed by processing the electrode rod.

Furthermore, the external diameter D of the external thread is 0.3-1.2mm, and the internal diameter D is 0.25-1.15 mm.

Furthermore, the thread pitch s of the external thread is 0.05-0.5 mm.

Further, the rough structure is frosted, and the surface roughness Ra of the frosted structure is 2.5-6.3 μm.

Furthermore, the coarse structure is frosted, and the fineness of the frosted structure is 80-250 meshes.

Furthermore, the rough structure is a notch, the angle formed by the notch and the electrode rod is 30-60 degrees, the depth is 0.01-0.05mm, and the distance is 0.05-0.1 mm.

Further, the coarse structure is a score, the depth of the score is 0.01-0.05mm, the distance is 0.05-0.1mm, the score comprises a score a and a score b, the angle formed by the score a and the electrode rod is 30-60 degrees, and the angle formed by the score b and the electrode rod is 120-150 degrees.

Screw thread or nick, can be through numerical control lathe rapid tooling production, the dull polish also can be through grinding machine batch processing production, these measures all can be obtained in the direct processing on the basis of electrode pole, do not need additionally to add other spare parts.

Compared with the prior art, the utility model has the advantages of it is following:

(1) the reliability is strong: the surface roughness of the electrode rod is improved, so that the sealing quality with glass is improved, the performance parameters of the lamp are improved, and the service life of the lamp is prolonged;

(2) the applicability is strong: the ultra-high voltage mercury lamp electrodes with various specifications can achieve the effect of improving the performance by adopting the structure;

(3) the production efficiency is high: the thread or the nick can be rapidly processed and produced through a numerical control lathe, the ground finish can also be processed and produced in batches through a grinding machine, the measures can be directly processed and obtained on the basis of the electrode rod, other parts do not need to be additionally arranged, the production qualification rate is high, and the efficiency is correspondingly improved.

Drawings

FIG. 1 is a schematic view of an electrode in example 1;

FIG. 2 is an enlarged view of the thread of example 1;

FIG. 3 is a schematic view of an electrode in example 2;

FIG. 4 is a schematic view of an electrode in example 3;

FIG. 5 is a schematic view of a prior art electrode;

FIG. 6 is a schematic view of a prior art electrode;

the reference numbers in the figures indicate: electrode tip 1, metal coil 11, electrode rod 2, coarse structure 21.

Detailed Description

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

Example 1

An electrode for an ultra-high pressure mercury lamp, as shown in fig. 1, comprises an electrode tip 1 and an electrode rod 2 which are integrally formed, wherein a metal coil 11 is sleeved on the electrode tip 1, a rough structure 21 which is convenient for sealing with glass is arranged on the electrode rod 2, and the rough structure 21 is in the form of a thread. The length of the roughness 21 occupies 30-80% of the length of the electrode rod 2.

As shown in fig. 2, the thread is an external thread formed by machining the electrode rod 2. The external diameter D of the external thread is 0.3-1.2mm, and the internal diameter D is 0.25-1.15 mm. The pitch s is 0.05-0.5 mm.

The electrode of the embodiment can improve the service life of the high-pressure mercury lamp from 2500h before improvement to 3500 h.

Example 2

An electrode for an ultra-high pressure mercury lamp, as shown in fig. 3, comprises an electrode tip 1 and an electrode rod 2 which are integrally formed, wherein a metal coil 11 is sleeved on the electrode tip 1, a rough structure 21 which is convenient for sealing with glass is arranged on the electrode rod 2, and the rough structure 21 is frosted. The length of the roughness 21 occupies 30-80% of the length of the electrode rod 2. The surface roughness Ra of the matte was 2.5 to 6.3 μm.

The electrode of the embodiment can improve the service life of the high-pressure mercury lamp from 2500h before improvement to 3200 h.

Example 3

An electrode for ultra-high pressure mercury lamp, as shown in fig. 4, comprises an electrode tip 1 and an electrode rod 2 which are integrally formed, wherein a metal coil 11 is sleeved on the electrode tip 1, a rough structure 21 which is convenient for sealing with glass is arranged on the electrode rod 2, and the rough structure 21 is in the form of nick. The length of the roughness 21 occupies 30-80% of the length of the electrode rod 2.

The depth of the score is 0.01-0.05mm, the distance is 0.05-0.1mm, the score comprises a score a and a score b, the angle formed by the score a and the electrode rod 2 is 30-60 degrees, and the angle formed by the score b and the electrode rod 2 is 120-150 degrees.

The electrode of the embodiment can improve the service life of the high-pressure mercury lamp from 2500h before improvement to 3450 h.

Claims

1. The electrode of the ultra-high pressure mercury lamp comprises an electrode tip (1) and an electrode rod (2) which are integrally formed, wherein a metal coil (11) is sleeved on the electrode tip (1), and the electrode is characterized in that a rough structure (21) convenient for sealing with glass is arranged on the surface of the electrode rod (2).

2. The electrode for an ultra-high pressure mercury lamp as claimed in claim 1, characterized in that the roughness (21) is in the form of a thread, a frosting or a scoring, the length of the roughness (21) occupying 30-80% of the length of the electrode rod (2).

3. The electrode for an ultra-high pressure mercury lamp as claimed in claim 1, wherein the roughness (21) is a thread, and the thread is an external thread formed by machining the electrode rod (2).

4. The electrode according to claim 3, wherein the external thread has an outer diameter D of 0.3 to 1.2mm and an inner diameter D of 0.25 to 1.15 mm.

5. The electrode according to claim 3, wherein a pitch s of the external thread is 0.05 to 0.5 mm.

6. The electrode according to claim 1, wherein the rough structure (21) is a frosted surface having a surface roughness Ra of 2.5 to 6.3 μm.

7. The electrode of an ultra-high pressure mercury lamp as claimed in claim 1, wherein the roughness structure (21) is frosted, and the frosted roughness is 80-250 mesh.

8. The electrode for an ultra-high pressure mercury lamp as claimed in claim 1, wherein the roughness (21) is a notch which forms an angle of 30 to 60 ° with the electrode rod (2), a depth of 0.01 to 0.05mm, and a pitch of 0.05 to 0.1 mm.

9. The electrode of claim 1, wherein the roughness structure (21) is a score, the depth of the score is 0.01-0.05mm, the distance between the scores is 0.05-0.1mm, the score comprises a score a and a score b, the angle formed by the score a and the electrode rod (2) is 30-60 degrees, and the angle formed by the score b and the electrode rod (2) is 120-150 degrees.