Abstract:
A gas oven includes a gas valve having a rotor plug rotatably held within a valve body of the gas valve, an oxygen supply system fluidically connected with the gas valve for directing oxygen into the valve for adjusting an oxygen stream flowing into a gas stream through the valve for helping a complete gas combustion in the gas oven to prevent the production of poisonous carbon.

Description:
BACKGROUND OF THE INVENTION 
     A conventional gas oven for burning liquid petroleam gas or natural gas such as for family cooking purpose may include a gas valve means as shown in FIGS. 1, 1A, 2 and 2A. 
     The gas valve means includes a valve body 10 having a gas inlet port 12 vertically formed in a gas tube adapter 13 for directing fuel gas into the port 12 (direction G), a rotor plug hole 11 horizontally formed in the valve body 10 perpendicularly communicating the gas inlet port 12 for rotatably engaging a rotor plug 20 in the hole 11, and a rotating knob 30 secured with the rotor plug 20 rotatably mounted on the gas oven (not shown) for operating the rotor plug 20 for adjusting gas flow rate to a burning nozzle of the oven. The plug 20 normally seals the gas inlet port 12 for closing the gas valve. 
     The rotor plug 20 is formed with a central longitudinal hole 21 about a longitudinal axis 210 of the plug 20, a large gas inlet opening 211 radially formed through a cross section of the plug 20 perpendicularly intersecting and communicating the central longitudinal hole 21 having a large gas outlet opening 213 formed in an opposite end of the inlet opening 211 on a perimeter of the plug 20 communicating with a first gas passage 113 formed in the valve body 10 to be finally connected with an outer large gas nozzle 115 of a gas burner, a small gas inlet opening 212 radially formed in the plug 20 to be angularly separated from the large opening 211 along a cross sectional plane perpendicular to the longitudinal axis 210 and communicating with the central longitudinal hole 21 and communicating a second gas passage 112 formed in the valve body 10 to be finally connected with an inner small gas nozzle 114 of the gas burner 114, a pilot gas outlet opening 214 formed in an outer portion of the plug 20 communicating with a pilot gas passage 111, 111a formed in the valve body 10 to be finally communicated with a pilot gas nozzle 105 for discharging pilot gas to be ignited by an igniting means 14 secured to the valve body 10. 
     When the knob 30 is rotated to rotate the plug 20 to match the large opening 211 with the gas inlet port 12, the gas (fuel gas) will be directed through the opening 211, the central hole 21 to respectively direct gas to the nozzles 105, 114 and 115, in which the pilot gas is first ignited at nozzle 105 by the igniting means 14 to start the burning of the large nozzle 115 and the small nozzle 114, both nozzles 115, 114 forming an outer-ring gas burner and an inner-ring gas burner (not shown) for cooking or heating purpose for the gas oven. Two air adjusting means 40 are provided on the two nozzles 115, 114 for adjusting the primary air for helping combustion of the gas. 
     The rotor plug 20 includes a plug portion having the central longitudinal hole 21 formed therein and a stem 22 secured with the rotating knob 30. A sealing member (not shown) may be provided in the stem to prevent gas leakage from the stem if being made as a hollow stem as shown in the figures. 
     Such a conventional gas oven may sometimes cause an incomplete combustion of the gas, if for instance the gas oven is operated for burning the gas in a closed room or kitchen, thereby producing carbon monoxide which is poisonous and hazardous to human life and causing coking or accumulation of carbon black on the utensils due to the incomplete combustion of the gas. 
     The present inventor has found the deflects of a conventional gas oven and invented the present invention having a supply of combustion aid for helping a complete gas combustion of a gas oven. 
     SUMMARY OF THE INVENTION 
     The object of the present invention is to provide a gas oven including a gas valve having a rotor plug rotatably held within a valve body of the gas valve, an oxygen supply system fluidically connected with the gas valve for directing oxygen into the valve for adjusting an oxygen stream flowing into a gas stream through the valve for helping a complete gas combustion in the gas oven to prevent the production of poisonous carbon monoxide. 
    
    
     BRIEF DESCRIPTION OF THE DRAWINGS 
     FIG. 1 is a perspective view of a conventional gas valve. 
     FIG. 1A is an enlarged view of the rotor plug of the conventional gas valve. 
     FIG. 2 is a sectional drawing of the conventional gas valve. 
     FIG. 2A is a sectional view of the conventional gas valve when viewed from direction 2A of the FIG. 2. 
     FIG. 3 is a perspective view of the drawing in which the rotor plug is enlarged. 
     FIG. 4 is another perspective view of the present invention viewed from a rear side of FIG. 3 added with an oxygen supply system. 
     FIG. 5 is a sectional drawing of FIG. 4 in accordance with the present invention. 
    
    
     DETAILED DESCRIPTION 
     The basic elements of the present invention are similar to a conventional gas valve as aforesaid and as shown in FIGS. 1-2A. 
     As shown in FIG. 3, the rotor plug 20 as aforesaid is extended to increase its length for providing oxygen openings in the plug 20 and an oxygen adapter base 60 is provided on the valve body 10 for connecting an oxygen adapter 53 of an oxygen supply system 50 as shown in FIG. 4 of which the oxygen supply system 50 includes an oxygen source or oxygen cylinder 501, a pressure regulator 51, and a gas tube 52 or hose which may be further connected with multiple-pass branches for other oxygen uses. 
     The oxygen gas O 2  is directed into the valve body 10 of a gas valve means of a gas oven through an oxygen inlet port 63 formed in the valve body 10 adjacent to the oxygen adapter base 60, and juxtapositional to the gas inlet port 12 also formed in the valve body 10. 
     The rotor plug 20 generally cylindrical shaped is formed with a larger oxygen inlet opening 222 in an inner perimeter of the plug longitudinally projectively aligned with the large gas inlet opening 211 formed in an outer perimeter of the plug 20, a large oxygen outlet opening 224 formed in an inner perimeter of the plug 20 opposite to the large oxygen inlet opening 222 having a large hollow oxygen tube 22a connecting the large oxygen inlet and outlet openings 222, 224 poking through the central longitudinal hole 21 longitudinally formed in the rotor plug 20, a small oxygen inlet opening 221 formed in a middle perimeter of the plug 20 longitudinally projectively aligned with the small oxygen inlet opening 221 formed in an outer perimeter of the plug 20, and a small oxygen outlet opening 223 formed in a middle perimeter of the plug 20 opposite to the small oxygen inlet opening 221 having a small hollow oxygen tube 22b connecting the small oxygen inlet and outlet openings 221, 223 poking through the central longitudinal hole 21. 
     When the rotor plug 20 is rotated to direct gas G through the gas port 12 into the large gas opening 211, the oxygen gas O 2  is inport into the valve means through the large oxygen opening 222; whereas if the gas is input the small gas opening 212, the oxygen will be fed into small oxygen opening 221 (FIG. 3). Each hollow tube 22a or 22b is not communicated with hole 21 to prevent unexpected mixing or burning of fuel gas with oxygen in the valve body 10. 
     A diameter of the hollow tube 22a or 22b should be smaller than a diameter of the central longitudinal hole 21 of the rotor plug 20 to prevent clogging of gas passage. 
     When the rotor plug 20 is rotated to match the large gas inlet opening 211 with the gas inlet port 12 to feed full gas G into the valve means of the present invention, the gas stream will flow into the central longitudinal hole 21 to distribute into the first gas passage 113 through outlet opening 213 as shown in FIG. 5 to an outer large nozzle 115 of the gas burner, and into the second gas passage 112 to an inner small nozzle 114 of the gas burner and a pilot gas stream flowing into the pilot gas passage 111, 111a to a pilot nozzle 105 to be ingited by the ingiting means 14. 
     Since the large oxygen inlet opening 222 is projectively aligned with the large gas inlet opening 211, the oxygen O 2  will be led into the oxygen opening through the inlet port 63, through the large hollow oxygen tube 22a, a large oxygen passage 226 formed in the valve body 10 to be distributed to a large oxygen nozzle 615 adjacent to the large gas nozzle 115 for helping a complete gas combustion at the large gas nozzle 115, and also distributed to a first small oxygen nozzle 815 through a by-pass oxygen passage 810 branched from the large oxygen passage 26 to be adjacent to the small gas nozzle 114 for helping a complete gas combustion at the small gas nozzle 114. 
     When the rotor plug 20 is rotated to match the small gas opening 212 with the gas port 12 to lead fuel gas G into the valve means, the fuel gas will enter the central hole 21 through the second gas passage 112 to the small gas nozzle 114 and the large gas outlet opening 213 is rotated to deviate from the gas passage 113 thereby closing the large gas nozzle 115 for causing a smaller flame burned at the small nozzle 114. 
     Since the small oxygen opening 221 is projectively aligned with the small gas opening 212, the oxygen will be fed into the opening 221 through the oxygen port 63, through the small hollow oxygen tube 22b, a small oxygen passage 710 formed in the valve body 10 to be distributed to a second small oxygen nozzle 715 adjacent to the small gas nozzle 114 for helping a complete gas combustion at the small gas nozzle 114. 
     All the oxygen streams are respectively mixed with the fuel gas streams after being discharged from the relevant nozzles so that the oxygen assists the combustion of fuel gas under an atmospheric pressure, rather than in any fluid passage in the valve body 10, thereby preventing unexpected &#34;back fire&#34; or explosion caused in a closed &#34;chamber&#34;. 
     Since an additional combustion aid such as oxygen gas is provided to help the combustion of the fuel gas of the gas oven, the present invention may prevent an incomplete gas combustion and prevent the production of poisonous, hazardous carbon monoxide and pollutants such as carbon black. 
     The oxygen tube 52 of the oxygen supply system 50 may be further connected with multiple-pass branches (not shown) of which one branch is provided with a valve having a timer for periodically supplying oxygen into a room interior for refreshing air for people&#39;s breathing purpose; or another branch is provided with a mask adapted for a patient&#39;s emergency breathing for first aid purpose.