Patent Application
20060019208
I. Field of the Invention
This invention relates generally to a hot air gun and, more specifically, to a 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, a safety switch closes power or gas flow under some pre-set conditions for safety purpose.
II. Description of the Prior Art
Heretofore, it is known that the “Internal structure of a hot air gun” of Taiwan listed pattern no. 286505 comprises of a main body 1, a handle 2 and a power supply 3; the main body 1 connects to the handle with a hinge 11; the main body further comprises a motor 14, a fan 15 is on the motor axis 141 of the motor 14, a fan blade 16 in on the front of the fan 15, a burning chamber 161 is beneath the fan blade 16, an ignition tube 17 interlinks to the burning chamber 161 a temperature control switch 18 and a control rod 19 are installed inside the ignition tube 17; a power supply 3 and gas are inside the handle 2, a flow control knob 23 is on top of the handle 2, a flame nozzle 24 is on the front of the flow control knob 23, the flame nozzle 24 is ignited inside the burning chamber 161 beneath the fan blade 16, a press button 25 and switch 26 are installed on the handle to ignite gas and turn the motor 14 on.
Many drawbacks exist on the known gas hot air gun, the flame burn the gas in the burning chamber 161 beneath the fan blade 16 after the gas is ignited, hot air is flown out by the fan blade 16 of the fan 15; however the flame inside the burning chamber 161 is blown out easily to burn users, such is not very safe, the temperature control switch 18 reduces the gas quantity after the temperature is high, when temperature is low the gas quantity is increased to have larger flame, such design introduces not complete burning of gas, the air injected might contain large quantity of carbon mono-oxide, it is very dangerous for users to apply the equipment in a sealed environment.
It is therefore a primary object of the invention to provide a gas hot air gun that improves the known hot air guns often have the flame blown out easily to burn users, such is not very safe; the temperature sensor reduces the amount of gas when the temperature is too high and increases the amount of gas when the temperature is too low to make larger flame, such design introduces not complete burning of gas, the air injected might contain large quantity of carbon mono-oxide.
In order to achieve the objective set forth, a gas hot air gun in accordance with the present invention comprises a main body, an ignition device, a switch set and a safety switch; the main body further comprises of a blower and a nozzle, the main body has a barrel and a handle as appearance; a heating chamber and a mixing chamber are on the inner front of the barrel, a battery set and a gas can are inside the handle, one end of the nozzle is connected to the gas can, the switch set further comprises of a power switch and an ignition switch, the safety switch connects to the switch set electrically, the safety switch closes power of the battery set or gas flow of the gas can under some pre-set conditions; users press the power switch and have gas spray out from the nozzle into the heating chamber to generate heat, the blower sends out hot air in the heating chamber out of the main body; a metal slice to regulate the direction of air and a catalyst to avoid flame out of the nozzle area are inside the heating chamber. The present invention is small in size and easy for users to carry.
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:
Referring to
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 nozzle 40 is installed inside the barrel 11 of the main body 10 and located between the blower 20 and the mixing chamber 112; one end of the nozzle 40 is connected to the gas can 122.
The switch set 50 is installed inside the handle 12 of the main body 10 near the barrel 11; the switch set 50 further comprises of a power switch 51, a control rod 52, an ignition switch 53 and a regulation valve 54; the control rod 52 controls open and close of the gas can 122, the ignition switch 53 connects to the ignition device 30 with electrical wires; the regulation valve 53 is installed on the gas can 122 to control the gas flow amount of the gas can 122.
The safety switch 60 connects to the power switch 51, the safety switch 60 also connects to the motor 21, the temperature sensor 23 of the blower 20, the battery set 121 on the handle 12 and the control rod 52 of the switch set 50, all these components are controlled by the safety switch 60 to turn on and off.
Referring to
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 54; 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.
When following situations happen, the safety switch 60 elaborates the proper function; when power switch 51 is on without flame or gas burning stops, the temperature sensor 23 installed on the barrel 11 near the heating chamber 111 detects the temperature did not reach the expected temperature, the safety switch 60 stops all the signals to make the motor 21 stop, the control rod 52 break away to stop the gas. At normal operation, when the temperature sensor 23 detects abnormal high temperature, the safety switch 60 have the control rod 52 stop the gas and have the motor 21 turn on to blow air until temperature drop and then stop. When temperature sensor 23 detects the temperature remain high after the power switch 51 is off, the safety switch 60 have the nozzle 40 stop spraying gas and turn on the blower 20, the blower 20 keeps blowing fresh air to cool the temperature of the heating chamber 111, the metal slice 113 absorbs the cold fresh air to lower the temperature of the heating chamber with the good heat conductivity, when the temperature sensor 23 detects the temperature of the heating chamber 111 reach low temperature, the blower 20 is turned off; such design makes the present invention easier to carry without the danger of burn.
Referring to
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.
