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  Gas combustion deviceUSPTO Application #: 20060172244Title: Gas combustion device Abstract: A gas combustion device 1 has a combustor 7 for burning supplied combustion gas therein, an ejector 3 with a primary air hole for sucking a primary air due to ejector effect, and an ignitor 5 for igniting mixed gas injected from a wick 25 provided ahead of the ejector 3. The combustor 7 has a primary combustion chamber 11 for igniting and burning the mixed gas injected from the wick 25 therein, a secondary air hole 33 for supplying a secondary air to the gas burning after ignition, a secondary combustion chamber 13 for further burning the gas burnt in the primary combustion chamber 11 therein, and a tertiary air hole 35 for supplying a tertiary air to the gas burning in the secondary combustion chamber 13. Even when the amount of the primary air is increased, thereby improving ignitability of the mixed gas, since the secondary air is supplied to the gas after ignition in the primary combustion chamber 11, combustion performance of the gas is improved. (end of abstract) Agent: John S. Pratt, Esq Kilpatrick Stockton, LLP - Atlanta, GA, US Inventors: Shinji Kokuo, Katsunori Iwaki USPTO Applicaton #: 20060172244 - Class: 431351000 (USPTO) Related Patent Categories: Combustion, Flame Holder Having Protective Flame Enclosing Or Flame Stabilizing Structure, Including Means Feeding Air Axially Spaced Points Of The Flame The Patent Description & Claims data below is from USPTO Patent Application 20060172244. 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 with high combustion efficiency using burning flame caused by, in particular, Liquefied Petroleum Gas (LPG) as a heat source. BACKGROUND ART [0002] Conventionally, a gas combustion device contained in devices such as portable hair driers and heat guns has been known. [0003] Referring to FIGS. 1 to 3, in a gas combustion device 101 contained in a hair drier, a combustor 103 for burning gas is provided in a cylindrical casing 105 of the hair drier. The combustor 103 burns combustion gas supplied from a gas tank (not shown) in which fuel is stored. The air heated by the combustor 103 is emitted to the side of a vent by a fan (not shown) provided at the side of an inlet of the casing 105. [0004] In FIG. 1, the gas tank not shown is connected to the combustor 103 through a gas passage 107. Due to flow speed of the combustion gas supplied to the combustor 103, the pressure in the gas passage 107 becomes negative relative to the outside pressure. An ejector 111 with a suction port 109 for sucking outside air from the outside of the gas passage 107 by utilizing a difference between the outside pressure and the pressure in the gas passage 107 is provided at and end of the gas passage 107. [0005] In detail, as shown in FIG. 2, supplied LPG, for example, is injected from a nozzle 113 in the ejector 111 at high speed. Since the pressure in the gas passage 107 and the ejector 111 becomes negative due to the ejector effect generated by injection speed of the injected gas, outside air for mixing gas flows into from the suction port 109. As a result, mixed gas of the injected gas and air is generated. [0006] The mixed gas is injected from a wick (wire mesh) 115 provided in the combustor 103 at the side of the inlet. A spark generated from an ignition plug (ignitor) 117 (refer to FIG. 3) by high voltage is blown to the wick 115 which injects the mixed gas, thereby igniting the mixed gas. [0007] The combustor 103 is disposed between the fan and the vent of the casing 105. As shown in FIG. 3, the shape of a cross section perpendicular to the longitudinal direction of the combustor 103 is a non-circular cylindrical body in which the wick 115 is located at the center of the gas combustion device 101 and which has eight radial groove-like combustion chambers 119 in the shape of eight-divided star-like projections around the wick 115 (a first conventional example: Japanese Patent Application Laid-open Publication No. 2002-233416). [0008] Since the ejector 111 is provided in the above-mentioned conventional gas combustion device 101 to supply the combustion gas to the combustor 103, outside air is automatically sucked from the suction port 109 due to the ejector effect generated by injection speed of the gas injected from the nozzle 113 in the ejector 111 at high speed. Thus, since the mixed gas of the gas and air is generated and injected from the surface of the wick 115, whereby complete combustion is promoted. [0009] 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 generates and the combustion performance is lowered. As a result, CO concentration is increased. [0010] Conversely, to improve the combustion efficiency, when the amount of air 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, resulting in failure to burn. [0011] Thus, to keep a certain level of ignitability, even when the size of the suction port 109 of the ejector 111 is made small to suppress the amount of sucked air, the ratio of air in the mixed gas is lowered compared to the mixed gas with good combustion efficiency for the above-mentioned reason and therefore, the problem occurs that air slightly lacks and CO concentration becomes high. [0012] A conventional example 2: Japanese Patent Application Laid-open Publication No. 2002-249347 discloses that a combustor comprised of a primary combustion chamber for burning mixed gas injected from a wick and a secondary combustion chamber for supplying a secondary air from outside air to the gas burnt in the primary combustion chamber and firing the combustion gas is provided and that complete combustion of the combustion gas is promoted in the secondary combustion chamber. [0013] However, also in the second conventional example, CO concentration is still high and there is a room for improvement. To solve the above-mentioned problem, the present invention intends to provide a gas combustion device capable of improving ignitability and combustion performance of gas and decreasing CO concentration. DISCLOSURE OF THE INVENTION [0014] To achieve the above-mentioned object, a gas combustion device according to the present invention comprises a combustor for burning combustion gas supplied from a gas source, a gas passage for sending the gas supplied from the gas source to the combustor, an ejector with a primary air hole for sucking a primary air due to negative pressure generated by flow speed of the combustion gas supplied to the combustor in the gas passage, an ignitor for igniting mixed gas injected from a wick provided ahead of the ejector, a primary combustion chamber provided in the combustor for igniting and burning the mixed gas injected from the wick therein, a secondary air hole provided in the combustor for supplying a secondary air to the gas burnt after ignition in the primary combustion chamber, a secondary combustion chamber for mixing the gas burnt in the primary combustion chamber with the secondary air sucked from the secondary air hole and further burning the mixed gas therein, and a tertiary air hole for supplying a tertiary air to the gas burnt in the secondary combustion chamber. BRIEF DESCRIPTION OF THE DRAWINGS [0015] FIG. 1 is a side view of a conventional gas combustion device. [0016] FIG. 2 is a partial sectional view of an ejector in FIG. 1. [0017] FIG. 3 is a front view of the gas combustion device viewed from the left side in FIG. 1. [0018] FIG. 4 is a sectional view of a gas combustion device in accordance with an embodiment of the present invention taken along a line IV-IV in FIG. 6. [0019] FIG. 5 is a side view of the gas combustion device in accordance with the embodiment of the present invention. [0020] FIG. 6 is a front view of the gas combustion device viewed from the left side in FIG. 5. Continue reading... Full patent description for Gas combustion device Brief Patent Description - Full Patent Description - Patent Application Claims Click on the above for other options relating to this 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 device or other areas of interest. ### Previous Patent Application: Flame arrestor with reflection suppressor Next Patent Application: Gas burner with thermoelectric generator Industry Class: Combustion ### FreshPatents.com Support Thank you for viewing the Gas combustion device patent info. IP-related news and info Results in 0.20743 seconds Other interesting Feshpatents.com categories: Daimler Chrysler , DirecTV , Exxonmobil Chemical Company , Goodyear , Intel , Kyocera Wireless , |
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