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Device for cleaning electrode in high strength gas discharge light source with no air vent and its cleaning method

A technology for cleaning devices and exhaust ports, which is applied in the field of electric light sources, and can solve problems such as deterioration of lamp ignition characteristics, high working temperature of electrode surfaces, and rise in impurity concentration, and achieve the effects of simple structure, convenient operation, and good cleaning effect

Inactive Publication Date: 2003-10-08
FUDAN UNIV +1
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0002] In the ignition of a high-intensity gas discharge light source (HID), due to the high working temperature of the electrode (generally 1200 ° C ~ 2000 ° C), the impurity gas that has not been removed in the electrode and the pollutants on the electrode surface will be released into the discharge cavity. , resulting in a rapid deterioration of the ignition characteristics of the lamp
Under the low-power HID light source—especially under the short-arc and long-current working conditions, the working temperature of the electrode surface is higher, and even the release of trace impurities will cause a substantial increase in the concentration of impurities in the cavity

Method used

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  • Device for cleaning electrode in high strength gas discharge light source with no air vent and its cleaning method
  • Device for cleaning electrode in high strength gas discharge light source with no air vent and its cleaning method

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Embodiment

[0013] Example: The volume of the pre-discharge chamber 1 is about 8cm 3 , The electrode lead 2 is a molybdenum rod of φ1mm, the inner diameter of the electrode holder 3 is φ0.5mm, the electrode 4 to be cleaned is a pure tungsten rod of φ0.4mm, 8mm long, and its head is wound with a selected heat-conducting tungsten ring. Under vacuum conditions, bake the discharge chamber with a coal-oxygen flame, so that the electrodes are in the reddish initial gas release stage, and maintain it for 5 to 10 minutes, then turn off the vacuum conditions. Then fill it with 3000PaAr, maintain the discharge for 2 minutes at a discharge current of 5A, and then vacuumize. Then fill it with 1500PaAr, maintain the discharge for 5 minutes under the condition of 9A, and then evacuate. Fill it with 600PaAr again, maintain the discharge for 8 minutes under the condition of 12A, and finally exhaust it. Cut off after cooling, and take out the electrode under a protective atmosphere. The 100w UHP projec...

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Abstract

A cleaning device is composed of the predischarging cavity and the discharging circuits etc. When being cleaned, the electrode to be cleaned is inserted into the receptacle in the predischarging cavity. Then, filling inert gases, turning the discharging circuit loop on, heating the electrode make impurities release. Repeating 2-6 times of discharging processes are carried out until impurities of the electrode are eliminated totally. The invention has the features of simple structure, easy of operation and good cleaning effect.

Description

technical field [0001] The invention belongs to the technical field of electric light sources, and in particular relates to an electrode cleaning device for a high-intensity gas discharge light source without an exhaust port and a cleaning method thereof. Background technique [0002] In the ignition of a high-intensity gas discharge light source (HID), due to the high working temperature of the electrode (generally 1200 ° C ~ 2000 ° C), the impurity gas that has not been removed in the electrode and the pollutants on the electrode surface will be released into the discharge cavity. , resulting in a rapid deterioration of the ignition characteristics of the lamp. Under the low-power HID light source—especially under the short-arc and long-current working conditions, the working temperature of the electrode surface is higher, and even the release of trace impurities will cause a substantial increase in the concentration of impurities in the cavity. In the production and manu...

Claims

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Application Information

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IPC IPC(8): H01J9/00H01J9/02H01J9/38
Inventor 诸定昌张国才朱同茂徐卫国
Owner FUDAN UNIV
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