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.

1 . A multifunctional fuel gas nozzle comprising:
 a hollow core, on the top of which a liquefied gas hole is disposed;   a shell, within which the core is located, the rear end portion of the core being fastened to and tightly jointed to the shell, the front end portion of the core and the shell defining a clearance therebetween and the core being provided thereon with a lateral aperture;   a switch strip, which is disposed within said shell, in front of the core and is axially movable with respect to the shell, the shape of the rear end portion of the switch strip matching that of the front end portion of the core, when the switch strip and the core are closely attached to each other, both of them are tightly jointed to each other; a natural gas through hole being disposed at the position on the switch strip corresponding to the liquefied gas hole, the sum of the cross-sectional area of the liquefied gas hole and that of the lateral aperture being larger than or equal to the cross-sectional area of the natural gas hole;   a force application portion, which is disposed on the front face of the switch strip in favor of moving the switch strip; and   a stopping portion, which is disposed in front of the shell to prevent the switch strip from coming off the shell.   
   
   
       2 . The multifunctional fuel gas nozzle according to  claim 1 , wherein: said shell is hollow and cylindrical, and the switch strip joins the shell with high precision threads. 
   
   
       3 . The multifunctional fuel gas nozzle according to  claim 1 , wherein: the front end portion of said core is conical and said lateral aperture is disposed on the conical surface of the cone; the rear end portion of said switch strip is provided thereon with a recess which matches the front end portion of said core. 
   
   
       4 . The multifunctional fuel gas nozzle according to  claim 1 , wherein: the front end portion of said core is cylindrical, and said lateral aperture is disposed on the top surface of the cylinder, and the back face of said switch strip is flat, when the switch strip is tightly attached to the core, the switch strip covers the lateral aperture. 
   
   
       5 . The multifunctional fuel gas nozzle according to  claim 1 , wherein: said stopping portion is disposed at the front end portion of the shell. 
   
   
       6 . The multifunctional fuel gas nozzle according to  claim 5 , wherein: said stopping portion is composed of the portion, which is located in front of the switch strip, on the side surface inside the shell and is without turned threads. 
   
   
       7 . The multifunctional fuel gas nozzle according to  claim 6 , wherein: 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. 
   
   
       8 . The multifunctional fuel gas nozzle according to  claim 1 , wherein: said force application portion is disposed on the front face of the switch strip in favor of turning the groove of the switch strip using a screwdriver. 
   
   
       9 . The multifunctional fuel gas nozzle according to  claim 8 , wherein: the center of said groove is the center point of the natural gas hole.