Gas Hot Air Gun Head

Abstract

A gas hot air gun head includes a fuel supply device engagable with a gas reservoir and having a fluid inlet end, a fluid outlet end and a channel extending from the fluid inlet end to the fluid outlet end. Further, a flow-guiding device connects to the fluid outlet end of the fuel supply device and includes a combustor. The combustor connects to the fuel supply device. The combustor includes a combustion chamber extending therethrough. The combustion chamber includes first and second flow-guiding plates engaging therein and separating from each other in an axial direction. The first flow-guiding plate includes a plurality of first holes extending therethrough. The second flow-guiding plate includes a plurality of second holes extending therethrough. A centerline of one of the plurality of first holes offsets from centerlines of the plurality of second holes.

What is claimed is: 
     
         1 . A gas hot air gun head comprising:
 a fuel supply device having a fluid inlet end and a fluid outlet end, and defining a channel extending from the fluid inlet end to the fluid outlet end, with the fuel supply device engagable with a gas reservoir and configured for allowing gas in the gas reservoir flowing into the fuel supply device through the fluid inlet end, and with the fuel supply device including a plug mounted in and in fluid communication with the channel, a spray head configured for controlling the volume of gas thereout connecting with an end of and in fluid communication with the plug, and an extension tube in which gas and air is mixed connecting with an end of the spray head; and   a flow-guiding device connecting to the fluid outlet end of the fuel supply device and in fluid communication with the plug via the extension tube, with the flow-guiding device including a combustor, with the combustor connecting to the fuel supply device, with the combustor including a combustion chamber extending therethrough, with the combustion chamber including first and second flow-guiding plates engaging therein and separating from each other in an axial direction, with the first flow-guiding plate including a plurality of first holes extending therethrough, with the second flow-guiding plate including a plurality of second holes extending therethrough, and with centerlines of the plurality of first holes offsetting from centerlines of the plurality of second holes.   
     
     
         2 . The gas hot air gun head as claimed in  claim 1 , wherein the combustion chamber has an inner periphery and each of the first and second flow-guiding plates includes a peripheral edge thereof abutting against the inner periphery, with no gap between the inner periphery and the peripheral edge of the first flow-guiding plate, and with no gap between the inner periphery and the peripheral edge of the second flow-guiding plate. 
     
     
         3 . The gas hot air gun head as claimed in  claim 2 , wherein each of the plurality of first holes has a first diameter, wherein each of the plurality of second holes has a second diameter, wherein the second diameter is not equal to the first diameter. 
     
     
         4 . The gas hot air gun head as claimed in  claim 3 , wherein the second diameter is shorter than the first diameter. 
     
     
         5 . The gas hot air gun head as claimed in  claim 4 , wherein the second flow-guiding plate has a plurality of third holes extending therethrough, wherein centerlines of the plurality of third holes offset from centerlines of the plurality of first holes, wherein the pluralities of second and third holes are disposed alternatively and radially with respect to a center of the second flow-guiding plate, wherein each of the plurality of third holes has a third diameter, and wherein the third diameter is not equal to the second diameter. 
     
     
         6 . The gas hot air gun head as claimed in  claim 5 , wherein the number of the plurality of second holes is less than the number of the plurality of first holes, and wherein the number of plurality of second holes equals to the number of plurality of third holes. 
     
     
         7 . The gas hot air gun head as claimed in  claim 6 , wherein the third diameter is shorter than the second diameter. 
     
     
         8 . The gas hot air gun head as claimed in  claim 1 , wherein the flow-guiding device includes an inner barrel and an outer barrel enclosing the inner barrel, wherein the inner barrel is radially spaced from the outer barrel, wherein each of the inner and outer barrels has two opposite open ends, wherein the inner and outer barrel have first ends connecting to the combustor. 
     
     
         9 . The gas hot air gun head as claimed in  claim 8 , wherein the inner barrel has a second end including a plurality of annular fins, with the plurality of annular fins disposed radially with respect to a center of the inner barrel, and with the plurality of annular fins disposed adjacent to each other in a circumferential direction of the inner barrel, wherein each of the plurality of annular fins includes a first lateral edge and a second lateral edge and has a circumferential dimension measuring from the first lateral edge to the second lateral edge, wherein the first and second lateral edges of each of the plurality of annular fins are radially spaced from the center of the inner barrel with first and second radial distances respectively, wherein the second radial distance is shorter than the first radial distance, and wherein the outer barrel has a second end including a stop edge blocking and abutting against the inner barrel, with the first lateral edges of the plurality of annular fins abutting against the stop edge. 
     
     
         10 . The gas hot air gun head as claimed in  claim 9 , wherein the plurality of annular fins and the inner barrel are made out of a material, and wherein the plurality of annular fins are bent from the second end of inner barrel. 
     
     
         11 . The gas hot air gun head as claimed in  claim 9 , wherein the combustor includes an annular outer peripheral wall and at least one flange protruding from and disposed outside the outer peripheral wall, wherein the at least one flange attaches and abuts against the first end of the inner barrel and the first end of the outer barrel. 
     
     
         12 . The gas hot air gun head as claimed in  claim 1 , wherein the extension tube is disposed outside the channel and the combustor. 
     
     
         13 . The gas hot air gun head as claimed in  claim 1  further comprising a retainer retaining the extension tube to the fluid outlet end, with the retainer secured to the fluid outlet end and including an edge blocking and abutting against a peripheral edge of the extension tube. 
     
     
         14 . The gas hot air gun head as claimed in  claim 1 , wherein the plug includes a partition separating and blocking connection of the first and second ends, wherein the plug includes first and second orifices receiving two ends of a preheater, wherein the preheater includes an end located adjacent to the combustor, and wherein the preheater is disposed outside the plug, and wherein the preheater interconnects the first and second ends of the plug. 
     
     
         15 . The gas hot air gun head as claimed in  claim 1 , wherein the spray head is slidably mounted on the plug, and wherein the plug and the spray head are further fastened by a fastening member, and wherein the fastening member circumferentially engages with peripheries of the plug and the spray head. 
     
     
         16 . The gas hot air gun head as claimed in  claim 1  further comprising an ignition device including an ignition switch and an ignitor activated by the ignition switch, wherein the ignitor includes a ceramic head, an ignition needle, a biasing member, and a teflon tube. 
     
     
         17 . The gas hot air gun head as claimed in  claim 16 , wherein the ceramic head defines a hole extending therethrough longitudinally, wherein the ceramic head has a first end fixed to the teflon tube and a second end located adjacent to the combustor, wherein the ignition needle has a first end inserted into the hole of the ceramic head and located adjacent to the combustor, wherein the ignition needle is biased by the biasing member, and wherein the biasing member is retained inside the teflon tube. 
     
     
         18 . The gas hot air gun head as claimed in  claim 1  further comprising a shell housing the fuel supply device, wherein the flow-guiding device is disposed outside the shell, and wherein the outer barrel  3 ( 3   a ) and the shell have gaps in between. 
     
     
         19 . The gas hot air gun head as claimed in  claim 18  further comprising a fixture is mounted in the shell, wherein the fixture includes an orifice extending therethrough, and wherein the extension tube is inserted through the orifice.