Patent Application
20060016091
1. 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.
2. Description of the Prior Art
Heretofore, it is known that the “Internal structure of a hot air gun” of Taiwan Publication 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, they are not easy to carry, if users apply the hot air gun outdoors, power plugs sometimes are not available, the power generator is needed; 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.
It is therefore a primary object of the invention to provide a 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 gas hot air gun in accordance with the present invention comprises a main body, an air blower, an ignition device, a nozzle and a switch set; 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 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; 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, an ignition switch 52 and a regulation valve 53; the power switch 51 connects to the battery set 121 and the blower 20 with electrical wires, the power switch 51 also has a control rod 511 to open and close the gas can 122; the ignition switch 52 connects between the battery set 121 and 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.
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 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 nozzle 14.
The temperature sensor 23 connecting to the blower 20 is installed on the barrel 11 near the heating chamber 111; when power switch 51 is turned off, the nozzle 40 stops spraying, the heating chamber 111 stops burning process but still remains in high temperature condition, 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
Although the invention has been explained in relation to its preferred embodiment, it is to be understood that many other possible modifications and variations can be made without departing from the scope of the invention as hereinafter claimed.
