FR2595506A1 - COMPOSITION FOR FILLING INCANDESCENT LAMPS - Google Patents

Abstract

THE INVENTION CONCERNS THE GAS FOR FILLING INCANDESCENT LAMPS. THE COMPOSITION OF THE GAS FOR FILLING THE INCANDESCENCE LAMPS ACCORDING TO THE INVENTION, INCLUDING NITROGEN AND KRYPTON, ALSO CONTAINS XENON. THE RESPECTIVE COMPONENTS ARE PRESENT IN THE COMPOSITION IN THE VOLUME PROPORTIONS EXPRESSED IN THE FOLLOWING:. KRYPTON: 79.8 To 83.7. XENON: 4.2 A 6.3. NITROGEN: 16.0 TO 10.0 THE COMPOSITION ACCORDING TO THE INVENTION FINDS APPLICATIONS IN THE ELECTROTECHNICAL INDUSTRY.

Description

COMPOSITION FOR FILLING INCANDESCENT LAMPS

  The present invention relates to the electrotechnical industry, and more particularly to a filling gas composition of incandescent lamps. There are incandescent lamp filling gas compositions comprising the following constituents, in the volume proportions expressed in%: nitrogen ............. 10 16 10. argon

  ........... 90 to 84 or a composition comprising in% by volume: nitrogen .............. 10 A 16 krypton ........ ... 90 to 84 However, said compositions involve use as starting materials. pure inert gases: argon and nitrogen in the first..DTD: case, krypton and nitrogen in the second.

  It is well known that all inert gases are obtained by

  separation of the liquid air into its various fractions.

  Separation is based on the difference in boiling temperatures

  and evaporation of said fractions.

  Pure krypton is obtained from an initial mixture krypton-

  xenon (technical krypton). Xenon constitutes in volume at least 5% of this mixture. Obtaining from this mixture pure inert gases, krypton and xenon, is carried out by distillation in a separation column. The boiling point of krypton is 120 K. In order to use it in the filling of incandescent lamps, the pure krypton thus obtained is mixed in the above proportions with

nitrogen.

  The processes for separating pure inert gases are expensive, which increases the cost of the lamps. A further disadvantage of the filling gas compositions of incandescent lamps lies in the fact that the proportion of each of the constituents in the mixture is optimal and prohibits the improvement of their qualities.

  (light and electrical characteristics, service life). The decrease

  The nitrogen content, although favorable to the luminous characteristics, reduces, in view of the general growth of the molecular weight of the lamp filling gas, the value of the breakdown voltage, which makes the fragility of the lamps appear, and hence even, decreases their average ignition time. However, the increase in the content

  in nitrogen is detrimental to the qualities of the lamps.

  The aim of the invention is to provide a filling gas composition for incandescent lamps making it possible, thanks to the introduction of a new constituent and to the modification of the contents of constituents,

  to improve the quality of the lamps and to reduce their manufacturing costs.

  cation. The objective envisaged is achieved by the fact that the composition of the filling gas of the incandescent lamps according to the invention, comprising nitrogen and krypton, additionally contains xenon and

  the ratio of the starting constituents in% by volume is the following

  before: 20. krypton ........... 79.8 to 83.7 xenon ............. 4.2 to 6.3 nitrogen ..... 16.0 to 10.0 The ratio of the constituent contents of the composition according to the invention makes it possible to improve the qualities of the incandescent lamps and to prepare said composition not from the inert gases. pure but from a mixture krypton-xenon (krypton technique) containing

  from 5 to 7% by volume of xenon. The reduction of the xenon content

  below 4.2% (by volume) does not benefit either the electrical parameters or the light parameters, given the small increase in the molecular weight

of the whole mixture.

  The increase in xenon content above 6.3% makes

  increase the molecular weight of the mixture and increase

  the temperature of the incandescent body due to the decrease in the rate of evaporation of tungsten but causes a decrease in the breakdown voltage and therefore increases the fragility of the lamps and

reduces their average life.

259550U

  The composition according to the invention is obtained by adding pure nitrogen to a krypton-xenon mixture (technical krypton) in the proportions indicated. The composition according to the invention makes it possible on the one hand to improve the luminous and electrical characteristics of incandescent lamps, to increase their duration of use and, on the other hand, to reduce the manufacturing costs of said lamps. lamps through the use as

  starting materials not pure inert gases but a krypton-

  xenon. To better understand the idea of the present invention,

  below are some examples of the composition of the filling gas

  wise incandescent lamps according to the invention.

EXAMPLE 1

  A filling gas composition of incandescent lamps containing (in% by volume): krypton ........... 83.7 xenon ............. 6.3 nitrogen ............. 10 Comparative tests were made of the light and electrical characteristics of general purpose incandescent lamps (220 to 230 V, W) filled with the composition according to the invention. and lamps of the same type with known filling (krypton: 90% by volume, nitrogen: 10% by

  volume). The results of the tests are summarized in the following table.

EXAMPLE 2

  A filling gas composition of incandescent lamps comprising (in% by volume): krypton ........... 81.7 xenon ............. 4.3 nitrogen ............. 14.0

  This composition has undergone tests similar to those of the

  The results of the tests are summarized in the following table.

EXAMPLE 3

  A filling gas composition of incandescent lamps comprising (in% by volume): 35. krypton ........... 79,8 Xenon ........

  4.2 Nitrogen ............. 16.0 This composition was also subjected to the same tests as those of Example 1. The results of the tests are summarized in table below ... DTD: TABLE

  Composition according to the invention the invention Composition the invention ticks Example 1 Example 2 Existing example 3 Average luminous flux, in lm .......

806 800 798 796 Average power in W ............... 60.5 60.4 60.5 60.3 Average luminous efficiency, in lm / W ... 13,32 13 , 24 13.19 13.20 259550i

Claims (1)

  Filling gas composition of incandescent lamps comprising nitrogen and krypton, characterized in that it contains, additionally, xenon, the percentages of the components by volume being as follows: krypton ...... ..... 79.8 to 83.7 xenon ............. 4.2 to 6.3 nitrogen ............. 16.0 A 10.0