Sodium lamp in low pressure

A low-pressure sodium lamp and metal sodium technology, applied in the field of electric light sources, can solve the problems of poor use durability, poor light collection effect, large heat dissipation surface, etc., and achieve the effects of small heat dissipation surface, high light transmittance and compact structure

Inactive Publication Date: 2007-12-26
宋宝山
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Problems solved by technology

Therefore, the speed of the temperature rise of the discharge tube is an important factor. The discharge tube in the existing low-pressure sodium lamp is a straight tube with a large heat dissipation surface and poor light collection effect. It can only be used for spectral analysis and cannot be used for other lighting occasions.
At a working temperature of 260°C, sodium atoms strongly erode SiO2-based silicate glass, turning the light-transmitting glass into dark brown. Under the action of sodium atom erosion, the light efficiency will be reduced. The existing low-pressure sodium lamps poor durability

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  • Sodium lamp in low pressure
  • Sodium lamp in low pressure

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Embodiment Construction

[0012] As shown in the figure: the low-pressure sodium lamp is mainly composed of a discharge tube 12 and a transparent outer glass bulb 7. The discharge tube 12 is encapsulated with an inert gas and metal sodium 8. The discharge tube 12 is U-shaped and fixed on a high-vacuum cylinder through a support frame. Inside the transparent outer glass envelope 7; the inner wall of the outer glass envelope 7 is provided with an infrared reflective light-transmitting film 11, the infrared reflective light-transmitting film 11 is made of indium oxide as the main material, and is equipped with tin oxide and a medium liquid at a high temperature of 500°C-600°C In the environment, it is physically formed on the inner wall of the outer glass bulb 7, and the two poles of the discharge tube 12 are provided with electrodes 4. The electrodes 4 can be connected to the external power supply through the stem 2 and the lamp cap 1, which are relatively fixed to the outer glass bulb 7. The electrodes 4 ...

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Abstract

The low-pressure sodium vapor lamp includes discharging tube (DT) with inert gases and sodium metal being sealed inside. DT is setup inside high vacuum, columnar, transparent outer glass bulb. Through bracing frame, DT is fixed on the outer glass bulb. Electrodes are setup at two poles of the discharging tube respectively. DT includes sodium resisting jacking glass bulb in U type. The sodium resisting jacking glass bulb is composed of silicate glass layer in outer layer, and sodium resisting barium glass layer in inner layer. Compared with prior art, U type DT possesses features of compact structure, small size of outer glass bulb and cooling surface, fast temperature rise, good collection for light, and making DT reach 260 deg.C working temperature rapidly. Providing high light efficiency and high light penetrability, the invention is applicable to illuminant place including roads, tunnel, warehouses etc. in areas with different temperatures.

Description

technical field [0001] The invention relates to an electric light source, in particular to a low-pressure sodium lamp. Background technique [0002] Low-pressure sodium lamp is an electric light source product made by using the principle of low-pressure sodium vapor arc discharge. It has the characteristics of high energy efficiency and long life. When working, it radiates two extremely strong yellow line light sources in the visible light area, also known as D double line. , and their wavelengths are 589.0nm and 589.6nm respectively, and its average value of 589.3nm is usually taken as the standard wavelength parameter of yellow light. Existing low-pressure sodium lamps mainly include a discharge tube coaxially arranged in a transparent outer glass bulb. The discharge tube is filled with inert gas and metal sodium. Electrodes are arranged at the two poles of the discharge tube. The outer glass bulb is a photoelectric glass tube for protection; discharge The tube is fixed t...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H01J61/30H01J61/32H01J61/02
Inventor 宋宝山
Owner 宋宝山
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