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  Gas combustion-control method and gas combustion deviceUSPTO Application #: 20060194160Title: Gas combustion-control method and gas combustion device Abstract: A gas combustion device 1 comprises a combustor 11 for burning fuel gas supplied from a gas source, an air blower 15 for adjusting the amount of air in a cylindrical casing 5 which contains the combustor 11 therein; an ejector 7 with a primary air hole 37 for sucking a primary air into a gas passage leading from the gas source to the combustor 11 due to negative pressure caused by flow rate of the fuel gas supplied to the combustor 11 and an ignition device 9 for igniting mixed gas injected from a wick 39 provided ahead of the ejector 7. When fire is set to the mixed gas of the wick 39, ignitability of the mixed gas is improved by decreasing the amount of air in the casing. After ignition, combustion is maintained in the state where combustibility of the combustion gas in the combustor 11 is improved by increasing the amount of air in the casing 5. (end of abstract)
Agent: John S. Pratt, Esq Kilpatrick Stockton, LLP - Atlanta, GA, US Inventors: Shinji Kokuo, Katsunori Iwaki USPTO Applicaton #: 20060194160 - Class: 431012000 (USPTO) Related Patent Categories: Combustion, Process Of Combustion Or Burner Operation, Controlling Or Proportioning Feed The Patent Description & Claims data below is from USPTO Patent Application 20060194160. Brief Patent Description - Full Patent Description - Patent Application Claims
TECHNICAL FIELD [0001] The present invention relates to a gas combustion device for generating completely burnt hot air or warm air using burning flame by, in particular, Liquefied Petroleum Gas (LPG) as a heat source. BACKGROUND ART [0002] A gas combustion device has been conventionally installed in devices such as portable hair driers and heat guns using LPG. [0003] Referring to FIGS. 1 to 4, in a gas combustion device 103 installed in a hair drier 101, for example, a combustor 105 for burning gas is provided in a cylindrical casing 107 of the hair drier 101. The combustor 105 burns fuel gas supplied from a gas tank (not shown) as a gas source and air heated by the combustor 105 is flown to the side of a vent 117 by an air blower 115 comprised of a motor 111 provided at the side of an inlet of the casing 107 via a bracket 109 and a fan 113 attached to the motor 111. [0004] An ejector 123 with a suction port 121 for sucking outside air due to negative pressure caused by a flow rate of the fuel gas supplied to the combustor 105 is provided in a gas passage 119 leading from the gas tank to the combustor 105. As shown in FIG. 3, supplied LPG, for example, is injected from a nozzle 125 in the ejector 123 at high speed. Negative pressure occurs due to the ejector effect caused by the injection speed of gas and outside air necessary for combustion is flown into the ejector 123 from the suction port 121 to generate mixed gas consisting of LPG (gas) and air. [0005] The mixed gas is injected a wick (metal mesh) 127 provided within the combustor 105 at the side of its inlet and a spark generated from a ignition plug (ignition device) 129 through high-tension electricity is blown to the wick 127 and ignites the injected mixed gas. [0006] The combustor 105 is disposed between the air blower 115 and the vent 117 of the casing 107. Apparent from the shape of a cross section perpendicular to the longitudinal direction of the combustor 105 shown in FIG. 4, the combustor 105 is a non-circular cylindrical body in which the wick 127 is centrally located which has eight radial groove-like combustion chambers 131 in the shape of eight-divided star-like projections around the wick 127 (refer to Japanese Patent Application Laid-Open Publication No. 2002-233416). [0007] As shown in FIG. 1, in a state where the amount of air sent from the air blower 115 is constant, a process of igniting and burning the fuel gas using the conventional gas combustion device comprises a step of supplying fuel gas (LPG) to the ejector 123, a step of sucking outside air from the suction 121 of the ejector 123, a step of generating mixed gas of the fuel gas and air and injecting the mixed gas from the surface of the wick 127, a step of igniting the mixed gas injected from the wick 127 by the spark generated by the ignition plug (ignition device) 129 and burning the mixed gas within the combustor 105 and a step of discharging burnt air toward the vent 117 as warm air. This combustion state is continued until supply of LPG is stopped. [0008] However, the ignition performance of the mixed gas and the combustion performance of the combustion gas after ignition are conflicting one another. That is, to improve the ignition performance of the gas, the ratio of the gas to air in the mixed gas needs to be increased, and however, when the mixed gas with high gas ratio is burnt, a large amount of incomplete combustion gas is generated and the combustion performance is lowered. As a result, CO concentration is increased. [0009] Conversely, to improve the combustion efficiency, when the amount of air in the mixed gas is increased, thereby decreasing the ratio of gas in the mixed gas, the combustion performance is improved and however, it becomes difficult to set a fire because of much air, causing the problem that combustion cannot be started. [0010] In the conventional gas combustion device, since combustion is performed in the state where a certain amount of air is supplied from the air blower 115 at all times, there is a problem that it is difficult to generate the mixed gas which fully satisfies both the ignition performance and the combustion performance. [0011] To solve the above-mentioned problem, the present invention intends to provide a gas combustion control method and a gas combustion device capable of improving ignitability and combustion performance of gas and decreasing CO concentration. DISCLOSURE OF THE INVENTION [0012] To achieve the above-mentioned object, a gas combustion control method in a gas combustion device having a combustor for burning fuel gas supplied from a gas source, an air amount adjustment device for adjusting the amount of air in a cylindrical casing which contains the combustor therein, a wick for injecting mixed gas generated by mixing the fuel gas supplied from the gas source to the combustor and air in the casing into a combustion chamber, an ignition device for igniting the mixed gas injected from the wick, and a controller for controlling the air amount adjustment device and the ignition device, the method comprising the steps of: a first air amount adjustment step of controlling the air amount adjustment device so as to decrease the amount of air in the casing before the mixed gas injected from the wick is ignited, an ignition step of igniting the mixed gas, and a second air amount adjustment step of operating the air amount adjustment device at higher power than the first air amount adjustment step so as to increase the amount of air in the casing after the ignition step. [0013] Moreover, to achieve the above-mentioned object, a gas combustion device comprises a combustor for burning fuel gas supplied from a gas source, an air amount adjustment device for adjusting the amount of air in a cylindrical casing which contains the combustor therein, a wick for injecting mixed gas generated by mixing the fuel gas supplied from the gas source to the combustor and air in the casing into a combustion chamber, an ignition device for igniting the mixed gas injected from the wick, an ignition detection device for detecting ignition of the mixed gas in the combustor and a controller for controlling at least the air amount adjustment device and the ignition device on the basis of a signal from the ignition detection device, and the controller controls the air amount adjustment device so as to decrease the amount of air in the casing when the ignition detection does not detect ignition and controls the air amount adjustment device so as to increase the amount of air in the casing when the ignition detection detects ignition. BRIEF DESCRIPTION OF THE DRAWINGS [0014] FIG. 1 is a schematic view showing combustion of gas in a conventional gas combustion device. [0015] FIG. 2 is a side sectional view of a hair drier which contains the conventional gas combustion device therein. [0016] FIG. 3 is a partial sectional view of an ejector in FIG. 2. [0017] FIG. 4 is a front sectional view of a combustor taken along a line IV-IV in FIG. 2. [0018] FIG. 5 is a schematic view showing combustion of gas in a gas combustion device in accordance with an embodiment of the present invention. [0019] FIG. 6 is a side sectional view of the gas combustion device in accordance with the embodiment of the present invention taken along a line VI-VI in FIG. 7. [0020] FIG. 7 is a front sectional view of the gas combustion device viewed from the left side in FIG. 6. Continue reading... Full patent description for Gas combustion-control method and gas combustion device Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this Gas combustion-control method and gas combustion device patent application. ###  How KEYWORD MONITOR works... a FREE service from FreshPatents1. Sign up (takes 30 seconds). 2. Fill in the keywords to be monitored. 3. Each week you receive an email with patent applications related to your keywords. Start now! - Receive info on patent apps like Gas combustion-control method and gas combustion device or other areas of interest. ### Previous Patent Application: Block heat exchanger assembly for dust-containing flue gases and method of operating the same Next Patent Application: Fuel supplying tank Industry Class: Combustion ### FreshPatents.com Support Thank you for viewing the Gas combustion-control method and gas combustion device patent info. 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