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Patent Searching and Data


Title:
GAS DISTRIBUTOR FOR A BURNER
Document Type and Number:
WIPO Patent Application WO/1996/026392
Kind Code:
A1
Abstract:
A cone shaped body (10) has been inserted into a burner nozzle (9) inside a metal net (11) to provide a burner for lamps that produces better light and a lower sound level. The tip of the cone is pointed against the gas flow to that the gas flowing out of the net is uniformly distributed. This means that the discharged gas at the upper and the lower end of the nozzle have about the same velocity. This uniform gas flow produces a uniform flame about the nozzle which gives a better light and a lower sound level.

Inventors:
EKVALL BRUNO (SE)
Application Number:
PCT/SE1996/000245
Publication Date:
August 29, 1996
Filing Date:
February 22, 1996
Export Citation:
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Assignee:
PRIMUS AB (SE)
EKVALL BRUNO (SE)
International Classes:
F23D14/04; F21L19/00; F23D14/14; F23D14/28; F23D14/70; (IPC1-7): F23D14/14; F23D14/04
Foreign References:
DK29723A
DE87672C
DE392523C1924-03-26
DE2832708A11979-02-15
SE467591B1992-08-10
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Claims:
____!___
1. A gas distributor to a burner for lamps adapted to be connected to a gas container, characterized therein, a cone shaped portion (10) disposed within a burner nozzle (9) having its tip pointing against a flow of gas and sur¬ rounded by a cylinder shaped net (11) or a similar device that is attached between an upper portion of a burner tube (4) and an upper top portion (12) of the cone shaped portion (10) .
2. A gas distributor according to claim 1 wherein the cone shaped portion (10) and the top portion (12) are separable and connectable .
3. A gas distributor according to claim 1 wherein the distributor is made of metal.
4. A gas distributor according to claim 1 wherein the distributor is made of a ceramic material . AMENDED CLAIMS [received by the International Bureau on 12 June 1996 (12.06.96); original claims 14 replaced by amended claims 14 (1 page)] 1 A mobile lamp apparatus having a gas container (1) and a lamp attached thereto including a burner for producing a light flame characterized therein, a cone shaped portion (10) disposed in a burner nozzle (9) so that its tip is pointing against a gas flow and surrounded by a cylinder shaped net (11) or a similar device that is attached between an upper portion of a burner tube (4) and an upper top portion (12) of the cone shaped portion (10) , the tip being rounded.
5. 2 A lamp apparatus according to claim 1 wherein the cone shaped portion (10) and the top portion are separable and connectable .
6. 3 A lamp apparatus according to claim 1 wherein the distributor is made of metal .
7. 4 A lamp apparatus according to claim 1 wherein the distributor is made of a ceramic material.
Description:
GAS DISTRIBUTOR FOR A BURNER

Technical Field

The present invention relates to a gas distri- butor for a burner for lamps connected to a gas container. The burner has a substantially straight, upwardly pointing burner tube having an incandescent mantle disposed about the upper end of the tube.

Background Information

Conventional burner produce, when the lamp is burning, a strong hissing sound which may be very disturb¬ ing to the user of the lamp. The sound is produced as a result of the turbulence of the gas flow due to the high pressure that exists upstream of a nozzle of the burner. If the lamp is provided with a pressure reducing valve, that reduces the pressure ahead of the nozzle to such a low level that a laminar flow is created, the lamp burns almost soundlessly. Though, the reduction valves are com- parably bulky and expensive and are therefore seldom used.

Another way to, at least in some cases, bring down the sound level is to use a double nozzle wherein the gas flow is permitted to first pass a weaker restriction valve before the flow reaches an outflow nozzle. If the dimensions of the outflow nozzle are correctly adjusted, the nozzle may reduce the outflow velocity of the gas to a suitable level. However, the velocity is not reduced to a constant value because the pressure, although reduced, is proportionate to the pressure of the gas container and the velocity varies with the change of the pressure.

For example, the pressure, in a mandrel burner that is surrounded by an incandescent mantle, is, due to the flow velocity of the gas and the direction thereof, highest at the upper end and lowest at the lower end of the burner. This results in a higher outflow velocity in the upper discharge opening than in the lower. For exam¬ ple, when the gas pressure is reduced due to falling

temperature in the environment or when a small amount of gas remains, a flame disruption may easily occur at the lower opening when the gas flow velocity is lowered to a combustion level, especially when the burner is hot. This drawback cannot be eliminated by using double nozzles. Another problem that is often associated with conventional burners, having mandrel burners that are gas driven with an unreduced pressure, is that the light is not steady but twinkling.

Summary of the Invention

One object of the present invention is to provide a burner for lamps that provides a better light and lower sound level. This may be achieved by using a cone shaped body that is inserted in a burner nozzle that is disposed inside a metal net. The tip of the cone is pointed against the gas flow so that the discharged gas flow is uniformly distributed. This means that the gas that is discharged at the lower end and at the upper end of the nozzle have about the same velocity. This uniform gas discharge pro¬ duces a uniform flame about the nozzle which gives a better light and lower sound level.

Description of the Drawings Figure 1 shows a side view of a lamp having a gas distributor according to the present invention.

Figure 2 is a side view of a burner tube and the gas distributor according to the present invention.

Description of a Preferred Embodiment

Figure 1 shows a lamp having a gas container 1, an adjustment and shut off valve 2, an air/gas mixer 3, a burner tube 4, a lamp glass 5, an incandescent mantle 6, a lid 7 and a piezo-electric lighter 8. Figure 2 shows a detailed view of the burner tube

4 including a burner nozzle 9 having a gas distributor including a cone shaped portion 10 having a tip pointing

against a stream of gas flowing from the air/gas mixer. The cone shaped portion is surrounded by a cylinder shaped net 11 that is engaged with and attached to an upper part of the burner tube 4 and a lower part of a top portion 12. The top portion 12 is removably attached to the cone shaped portion 10. The gas stream is uniformly distributed about the net and the discharge rate is radially the same along the whole height of the net. In addition to a uni¬ form velocity of the flame along the net, the sound level is reduced compared to conventional burner nozzles. The parts of the burner nozzle as well as the cone shaped portion, the net and the top portion may be made of a suitable metal. However, other materials may also be used such a ceramic material. Instead of using a net, a sheet material having many holes defined therein or a thin ceramic filter may be used.

To be able to light the burner conveniently, an electric conductor 13 is connected to a piezo-lighter 8 so that an exposed end portion 14 is disposed within the incandescent mantle 6 for direct lighting and to avoid the use of a pilot flame.

Although only one preferred embodiment of the present invention has been described above and shown in the drawings, it is to be understood that the present invention is not limited to this embodiment but is only limited by the appended patent claims.