Multifunctional fuel gas nozzle

Abstract

The present invention discloses a multifunctional fuel gas nozzle such that the nozzle is generally applicable for both natural gas and liquefied gas with different pressures. The multifunctional fuel gas nozzle of the present invention comprises a hollow core, a shell which is tightly jointed to the rear end portion of the core, and a switch strip which is axially movable with respect to the shell. The above structure is always applicable by switching the switch strip whenever the shell is used for natural gas with a lower input pressure or liquefied gas with a higher input pressure. Therefore, natural gas and liquefied gas with different pressures can share the nozzle only by simple adjustment according to the present invention.

Description

BACKGROUND OF THE INVENTION[0001](a) Field of the Invention[0002]The present invention relates to a nozzle structure for a burner, and, more particularly, to a multifunctional fuel gas nozzle which is capable of adjustment to fit the user and applicable for liquefied gas or natural gas.[0003](b) Description of the Prior Art[0004]Humans have used chemical gas as a fuel for more than one hundred years. The most widely used fuels are natural gas with a lower pressure which is delivered by ducts, and liquefied gas with a higher pressure which is transported by cylinders (commonly referred to as drum gas).[0005]Since the input pressures of both described above are different, the gas valves of liquefied gas furnaces require smaller nozzle diameters thereof due to the higher input gas pressure of the liquefied gas filled in cylinders; the gas valves of natural gas furnaces require larger nozzle diameters thereof owing to the lower gas pressure of the natural gas delivered by ducts. Thus, i...

AI Technical Summary

Benefits of technology

[0012]Another technical problem that the present invention has been made to solve in view of the present technical situation is to provide a multifunctional fuel gas nozzle with excellent gas tightness, long life span and a compact volume.

[0017]If it is desired to use natural gas, the switch strip is moved such that the switch strip and the core are separated by a distance. The liquefied gas hole and the lateral aperture on the core would evolve gas simultaneously at this time, and the final flow volume blown off from the nozzle is controlled by the natural gas hole on the switch strip. Thus, it is very convenient to switch between different gas species for combustion. Besides, the front end of the shell is provided with the stopping portion which prevents the switch strip from coming off the shell. Therefore, no matter how the switch strip is moved, the switch strip would not come off the shell, thereby avoiding the loss of the switch strip.

[0018]In the implementation of the present invention, said shell can be designed to be hollow and cylindrical, and the switch strip joins the shell with high precision threads. Accordingly, it is convenient to adjust the position of the switch strip on the shell, and a good sealing of the nozzle is also achieved by avoiding the use of the seal members made of the materials such as plastics or the like and the aging thereof.

[0023]The inside diameter of the portion, which is located on the top of the side surface inside the shell and is without threads, is less than the outside diameter of the thread of the switch strip. Accordingly, when the switch strip is screwed to the limit position at the front end of the shell, it will stop due to no thread at all, so that it will not come off the shell. This structure is simple, convenient and practical.

[0026]Compared with the prior art, the core and the switch strip are mounted inside the shell, and the stopping portion is disposed at the front end of the shell according to the present invention. Such kind of structure can achieve the purpose of conveniently and rapidly adjusting the nozzle diameter by users themselves while it can also prevent the switch strip from coming off the shell, which results in the loss of the switch strip. Furthermore, the switch strip, the core and the stopping portion are tightly jointed to one another with high precision so that it is unnecessary to use sealing materials, thus simplifying the nozzle structure. It is more important that the defects of melting and aging of the sealing materials due to the use of them such as rubber or plastics or the like.

Problems solved by technology

Accordingly, this results in a severe waste problem.

It is difficult to distinguish the difference between those diameters.

Therefore, mistakes are easily made in the manufacturing and changing processes so that these processes must be operated by professionals, and the nozzles cannot be changed by consumers themselves.

While this adjusting method is simple and convenient and can be operated by consumers themselves, the volume of the removed nozzle is very small so that it is inconvenient to be stored and easy to be lost.

If the nozzle is to be changed back, the consumers must often face the difficulty of installation or the loss of the nozzle.

However, according to the technique, at least two kinds of gas inlets of different diameters must be disposed on the slide, so that the length of the slide is too long with respect to that of the entire nozzle, thus increasing the nozzle volume.

Besides, when in use, the nozzle temperature rises very high due to the combustion in the burner such that the O-ring seal would age or melt rapidly at such a high temperature and lose its sealing function, which may cause the leakage of fuel gas and a serious hazard.

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