Patent Publication Number: US-2006018637-A1

Title: Nozzle of gas hot air gun

Description:
BACKGROUND OF THE INVENTION  
      1. Field of the Invention  
      This invention relates generally to a gas hot air gun and, more specifically, to a nozzle of gas hot air gun that offers smaller physical size for users to carry around, complete burn of gas to reduce carbon mono-oxide and faster cooling down the whole set after application to prevent users from danger of burn.  
      2. Description of the Prior Art  
      Heretofore, it is known that the “Internal structure of a hot air gun” of Taiwan listed pattern no. 83795 comprises of a shell body  1 , a hot air pipe pedestal  2 , an insulated ceramic pedestal  3 , an air pipe  4  and an air blower  5 ; the shell body  1  contains all the above components; an electrical heating coil  6  wraps around the hot air pipe pedestal  2  externally, the combination is inserted into the insulated ceramic pedestal  3 , the air pipe  4  is installed outmost and fixed internally onto the shell body  1 ; the electrical heating coil  6  generates high temperature air, the air blower  5  blows the hot air out through the air pipe  4 .  
      In real application, the known hot air guns still have many drawbacks; since they need a power core to plug into the wall power to have the electrical hot wire  6  generate hot air, the length of the electrical hot wire  6  must be long enough to generate the temperature needed, if the electrical hot wire  6  is too long, then the shell body  1  must be large enough to accommodate, such results bulky physical size and not easy for users to carry; if the electrical hot wire  6  is too short, then the temperature is too low to apply; the electrical heating coil  6  remains hot after application, users can not pack the hot air gun up right away; users might get burn carelessly very often, the design of known hot air guns is not very safe, not very practical and needs improvement.  
     SUMMARY OF THE INVENTION  
      It is therefore a primary object of the invention to provide a nozzle of gas hot air gun that improves the known hot air guns have to apply AC power to generate heat with an electrical heating coil, and offers smaller physical size for users to carry around, complete burn of gas to reduce carbon mono-oxide and faster cooling down the whole set after application to prevent users from danger of burn.  
      In order to achieve the objective set forth, a nozzle of gas hot air gun in accordance with the present invention comprises a main body, an air blower, an ignition device, a switch set and a nozzle; the main body further comprises of a barrel, a handle, a heating chamber and a mixing chamber are on the inner front of the barrel, a blower and the ignition device are inside the barrel, a gas can is inside the handle; several spray holes are installed on the nozzle; users press the switch set and have gas spray out from the spray holes of the nozzle into the mixing chamber to mix with air properly and then is sent to the heating chamber for complete burn. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS  
      The accomplishment of the above-mentioned object of the present invention will become apparent from the following description and its accompanying drawings which disclose illustrative an embodiment of the present invention, and are as follows:  
       FIG. 1  is a perspective view of the present invention;  
       FIG. 2  is an assembly view of the present invention;  
       FIG. 3  is a cross-sectional view of the present invention;  
       FIG. 4  is an application view of the present invention;  
       FIG. 5  is a cross-sectional view of a further embodiment of the present invention;  
       FIG. 6  is another cross-sectional view of a further embodiment of the present invention;  
       FIG. 7  is a perspective view of another application of the present invention. 
    
    
     DESCRIPTION OF THE PREFERRED EMBODIMENT  
      Referring to  FIG. 1  to  FIG. 3 , the present invention comprises a main body  10 , an air blower  20 , an ignition device  30 , a switch set  40  and a nozzle  50 ; the main body  10  further consists of a barrel  11  and a handle  12 , a heating chamber  111  is inside the barrel  11 , a gas can  122  is inside the handle  12 , the nozzle  50  contains several spray holes  511 , the switch set  40  have the fluid of the gas can  122  flow into the nozzle  50  and spray out to the mixing chamber  112  through the spray holes  511 ; users can press the switch set  40  to have the fluid of the gas can  122  spray out from the nozzle  50 , the spray holes  511  of the nozzle  50  spray the fluid into the mixing chamber  112  to be mixed with air before entering the heating chamber  111  to be burnt completely in the heating chamber  111 .  
      The main body  10  comprises of a barrel  11 , a handle  12 , an intake  13  and a exhalation hole  14 ; a heating chamber  111  and a mixing chamber  112  are on the inner front of the barrel  11 , a daisy shape metal slice  113  and a catalyst  114  are inside the heating chamber  111 , the metal slice  113  is installed inside the heating chamber  111  near the front side of the barrel  11 , the catalyst  114  is installed near the end of the barrel  11 ; a burning chamber  115  is inside the metal slice  113 , the mixing chamber  112  in installed on the barrel  11  that is opposite to the location of the heating chamber  111 ; a shrink  116  near the metal slice  113  is formed on one end of the mixing chamber  112 , the shrink  116  is interlinked to the burning chamber  115  of the metal slice  113 ; several air inhalation holes  117  are around the mixing chamber  112 , a passages  118  is between the metal slice  113  and the barrel  11 ; a tube shape metal net  119  to control the mixing air flow is installed between the burning chamber  115  of the metal slice  113  and the shrink  116  of the mixing chamber  112 , a thicker metal net  120  with smaller net holes near the exhalation hole  14  is on one side of the metal net  119 . The handle  12  is connected to and beneath the barrel  11 , a first container  123  and a second container  124  are inside the handle  12 , a battery set  121  and a gas can  122  are inside the first and the second container  123 ,  124  respectively, the gas can  122  contains burnable fluid, usually is liquid gas; a movable cover  125  is on the bottom of the handle  12  to cover the first and the second container  123 ,  124 . The intake  13  is installed on the end of the barrel  11  for air to flow into the barrel  11 ; several protective grids  131  are on the intake  13  to prevent users from inserting their fingers in. The exhalation hole  14  is on the front of the barrel  11  to expel air from the barrel  11 .  
      The air blower  20  in installed internally on the end of the barrel  11  to draw air from the intake  13  into the barrel  11 , a DC motor is applied in this application, the blower  20  further comprises a motor  21 , a fan blade  22  and a temperature sensor  23 ; the motor  21  locates near one side of the exhalation hole  14 , the fan blade  22  is installed on the motor  21  and near one side of the intake  13  to be driven by the motor  21 ; the temperature sensor  23  is installed around the barrel  11  near the heating chamber  111 , the temperature sensor  23  controls the motor  20 , after end of application and when the temperature of the heating chamber  111  below certain temperature, the temperature sensor  23  stops the motor  21  from turning.  
      The ignition device  30  is installed inside the metal slice  113  of the heating chamber  111  to ignite the mixed gas in the heating chamber  111 ; the ignition device  30  is installed inside the burning chamber  115  of the metal slice  113  in this application.  
      The switch set  40  is installed inside the handle  12  of the main body  10  near the barrel  11 ; the switch set  40  further comprises of a power switch  41 , an ignition switch  42  and a regulation valve  53 ; the power switch  41  connects to the battery set  121  and the blower  20  with electrical wires, the power switch  41  also has a control rod  411  to open and close the gas can  122 ; the ignition switch  42  connects between the battery set  121  and the ignition device  30  with electrical wires; the regulation valve  43  is installed on the gas can  122  to control the gas flow amount of the gas can  122 .  
      The nozzle  50  is installed inside the barrel  11  of the main body  10  and located between the blower  20  and the mixing chamber  112 ; the nozzle  50  is in rectangular shape with several spray holes  51 , several fluid paths  52  opposite to the spray holes  51  are on the nozzle  50 , the fluid paths  52  are connect to the spray holes  51  inside the nozzle  50 , the fluid paths also connect to the gas can  122  to have the contents of the gas can  122  spray into the mixing chamber  112  and mix with fresh air through the spray holes  51 ; the evenly distributed spray holes  51  on the nozzle  50  spray out gas simultaneously at a larger area into the mixing chamber  112  to mix the gas and air with good ratio to be burnt completely, such scheme can avoid the generation of carbon mono-oxide.  
      Referring to  FIG. 4 , when the power switch  41  is pressed on, the control rod  411  opens the gas can  122 , the gas sprays out from the spray holes  51  of the nozzle  50 , since the spray holes  51  is evenly distributed on the nozzle  50 , the gas entering the mixing chamber spreads properly; at the same time, the blower  20  blow air from the intake  13  into the mixing chamber  112  to mix the gas and the air blown in; when the mix gas passes the shrink  116 , with the shrinking diameter of the shrink  116 , the mixed gas is compressed, the mixed air spays out the shrink  116  at a faster speed, the high speed injected mixed air entering the burning chamber  115  of the metal slice  113  flows to the tube shape metal net  119  that guides the flow direction of the mixed gas (referring to  FIG. 5 ), with the two blocks by the thicker metal net  120  on the front of the tube shape metal net  119  and the tube shape metal net  119  itself, since the net holes of the thicker metal net  120  is smaller, the mixed gas is blocked effectively to have most of the mixed gas spays out in all directions. When the ignition switch  42  is pressed, the ignition device  30  ignites the mixed gas and generates flame, the flame expands several tongues of flames from the burning chamber  115  to surround the metal slice  113  and have the temperature of the metal slice  113  rise gradually that forms the first burning; with the better heat exchange rate of the metal slice  113 , when the air flow sent by the blower  20  passes through the passage  118  of the metal slice  113 , air flow can bring the heat on the metal slice  113  to generate hot air; when the hot air passes through the catalyst  114 , the catalyst  114  burns the small quantity left-over gas to reduce the quantity of carbon mono-oxide (CO) that forms the second burning; after two times of burning, the air temperature is higher, the air is safer, the catalyst  114  avoids the burning flame in the metal slice  113  from coming out of the nozzle  14 .  
      The mixed gas needs to have a good ratio of fresh air and gas to be properly burnt, when oxygen contained is too low in the mixed gas, the inhalation holes  117  around the burning chamber  115  offers fresh air; the diameter of the shrink  116  of the mixing chamber shrinks  112  gradually, fresh air is sucked in, mixed with gas and enters the burning chamber  115  to be burnt stably; the quantity of gas can also be controlled by the regulation valve  53 ; since the metal slice  113  inside the heating chamber  111  has very good heat conductivity, the temperature of the metal slice  113  is lifted rapidly after the ignition inside the burning chamber  115 ; if the gas in the heating chamber  111  is not burnt properly, the toxic carbon mono-oxide is generated and is harmful to human body; in order to achieve complete burning, the catalyst  114  can achieve such purpose, the catalyst  114  reacts with the burning gas and generates non-toxic carbon di-oxide, the catalyst  114  can also prevent the flame from coming out of the exhalation hole  14 .  
      The motor  21  is installed near the front of the barrel  111 , the fan blade  22  is installed near the end of the barrel  11 , such arrangement makes the air blown by the blower  20  smoother, the gas from the nozzle  50  is easier to be lighted by the ignition device  30  not to be scattered by strong wind. The temperature sensor  23  connecting to the blower  20  is installed on the barrel  11  near the heating chamber  111 ; when power switch  41  is turned off, the nozzle  50  stops spraying, the heating chamber  111  stops burning process but still remains in high temperature condition, the temperature sensor  23  detects high temperature and have the blower  20  keep turning, the blower  20  can still turn and send fresh air to lower the heating chamber  111  temperature, the metal slice  113  has good heat conductivity to lower the heating chamber  111  temperature with cool air; when the temperature sensor  23  detects the heating chamber  111  reaches certain cool temperature, the blower  20  is stopped, the design makes the present invention easier to carry and prevent users from danger of burn.  
      Referring to  FIG. 6 , another application example of the present invention, the nozzle  60  is in round shape with several spray holes  61 , the periphery and empty area inside of the nozzle  60  offers air flow path to mix the gas sprayed by the spray holes  61 . Referring to  FIG. 7 , the nozzle  70  is in cross shape with several spray holes  71 , the periphery of the nozzle  70  offers air flow path to mix the gas sprayed by the spray holes  71 . The nozzle  50  with multiple spray holes design offers mixed gas with proper gas-air ratio for higher temperature hot air; the scheme makes the main body  10  smaller in physical size for smaller storage space and is easier for users to carry.  
      While a preferred embodiment of the invention has been shown and described in detail, it will be readily understood and appreciated that numerous omissions, changes and additions may be made without departing from the spirit and scope of the invention.