초록 ▼

A dual fuel vent free gas heater having at least one gas burner with a plurality of gas outlet ports in an upper surface thereof. The gas outlet ports are in flow communication with at least one pilot flame burner. An adjustable fuel injector or at least two fuel injectors feed fuel to the burner pr

A dual fuel vent free gas heater having at least one gas burner with a plurality of gas outlet ports in an upper surface thereof. The gas outlet ports are in flow communication with at least one pilot flame burner. An adjustable fuel injector or at least two fuel injectors feed fuel to the burner providing for introduction of more than one fuel to the burner. Optionally, an oxygen detection system, manual fuel selection control valve, and/or temperature shut off control system may be incorporated into the dual fuel vent free heater.

대표청구항 ▼

The invention claimed is: 1. A dual fuel vent free gas heater comprising: two regulators arranged in parallel flow paths and in flow communication with a fuel line extending to a thermostatic control valve; the thermostatic control valve having an injector fuel outlet line feeding a multi-positiona

The invention claimed is: 1. A dual fuel vent free gas heater comprising: two regulators arranged in parallel flow paths and in flow communication with a fuel line extending to a thermostatic control valve; the thermostatic control valve having an injector fuel outlet line feeding a multi-positional manual fuel control valve, said multi-positional manual control valve comprising a control block with a single control cylinder that is rotatable between a first angular position to feed a first injector fuel supply line or second angular position to feed a second injector fuel supply line; a gas burner having a plurality of gas outlet ports, said plurality of gas outlet ports being in flow communication with at least a first pilot flame burner; a first and a second fuel injector, said first fuel injector being in flow communication with the first injector fuel supply line and said second fuel injector being in flow communication with the second injector fuel supply line, said first and second fuel injectors being in flow communication with an interior of said gas burner via a gas burner inlet, said first and said second fuel injectors each having an injection angle with respect to the gas burner inlet other than 0°; and said first injector fuel supply lines and said first injectors each having a composition and configuration for transporting a first type of fuel at desired flow rates, said second injector fuel supply line and said second injector each having a composition and configuration for transporting a second type of fuel at desired flow rates, said first type of fuel being different from said second type of fuel. 2. The dual fuel gas heater of claim 1 further comprising an oxygen detection system, said oxygen detection system having a temperature sensor in proximity to said first pilot flame burner. 3. The dual fuel gas heater of claim 2 wherein said first type of fuel is fed through the first regulator and said second type of fuel is fed through the second regulator, said thermostat control valve electrically coupled to the temperature sensor and configured to shut off the flow of fuel to the injector fuel outlet line feeding the multi-positional manual fuel control valve upon receiving a shut off signal from the temperature sensor. 4. The dual fuel gas heater of claim 1 having an igniter in flow communication with said first pilot flame burner. 5. The dual fuel gas heater of claim 1 wherein said first type of fuel is natural gas and said second type of fuel is liquid propane gas. 6. The dual fuel gas heater of claim 1 wherein the thermostatic control valve has a pilot burner fuel outlet line and said plurality of gas outlet ports of said gas burner are in flow communication with said first pilot flame burner and a second pilot flame burner; said control block of said multi-positional valve having a cylindrical aperture, the cylindrical aperture having a first, second and third fuel injector apertures extending from said cylindrical aperture at about 90° intervals to a first, second and third sides of said control block, respectively, a first, second and third pilot aperture is axially aligned about said cylindrical aperture with each of said first, second and third fuel injector apertures, respectively, said control cylinder having a circumference proximate the circumference of said cylindrical aperture wherein said control cylinder is closely received within said cylindrical aperture, said control cylinder having an “L” shaped flow through fuel injector aperture and an axially aligned “L” shaped flow through pilot aperture, said control cylinder rotatable between the first angular position and the second angular position within said cylindrical aperture in said control block, at said first angular position said first fuel injector aperture and said first pilot aperture extending to said first side of said control block are in flow communication with said third fuel injector aperture and said third pilot aperture extending to said third side of said control block, at said second angular position said second fuel injector aperture and said second pilot aperture extending to said second side of said control block are in flow communication with said third fuel injector aperture and said third pilot aperture extending to said third side of said control block, the first fuel injector aperture coupled to the first injector fuel supply line, the first pilot aperture coupled to a first pilot flame burner supply line leading to the first pilot flame burner, the second fuel injector aperture coupled to the second fuel supply line, the second pilot aperture coupled to a second pilot flame burner supply line leading to the second pilot flame burner, the third fuel injector aperture coupled to the injector fuel outlet line of the thermostatic control valve, the third pilot aperture coupled to the pilot fuel outlet line of the thermostatic control valve. 7. A dual fuel gas heater comprising: two regulators in flow communication with a thermostatic control valve; a pilot line and an injector line leading from said thermostatic control valve to a multi-positional manual control valve; said multi-positional manual control valve having a first, second, and third control position, said first control position creating a flow communication between said pilot line and injector line leading from said thermostatic control valve with a first pilot flame burner and a first injector respectively, said second control position creating a flow communication between said pilot line and injector line leading from said thermostatic control valve with a second pilot flame burner and a second injector respectively, said third position cutting off fuel flow from said pilot line and injector line leading from said thermostatic control valve a first and second pilot line leading from said control valve to a first and second pilot flame burner; a first burner having said first and second pilot flame burners proximate gas outlet apertures and said first and second injectors proximate an axial opening; and a thermal switch being in electrical communication with a temperature sensor proximate each of said pilot flame burners and with said thermostatic control valve, said thermal switch sends a shut off signal to said thermostatic control valve when a first set temperature is exceeded in said first pilot flame burner or a second set temperature is exceeded in said second pilot flame burner. 8. The dual fuel heater of claim 7 wherein said first and said second pilot flame burners are proximate a first side of said burner. 9. The dual fuel heater of claim 7 wherein said first pilot flame burner is proximate a first side of said burner and said second pilot flame burner is proximate a second side of said burner. 10. A dual fuel gas heater comprising: a gas burner having a plurality of gas outlet ports, said plurality of gas outlet ports being in flow communication with a first pilot flame burner and a second pilot flame burner, a first and a second fuel injector, said first and second fuel injectors being in flow communication with an interior of said gas burner via a gas burner inlet; and a first regulator and a second regulator arranged in parallel flow paths and in flow communication with a fuel line extending to a thermostatic control valve, the first regulator configured for delivering a first type of fuel, the second regulator configured for delivering a second type of fuel; the thermostatic control valve having an injector fuel outlet line and a pilot burner fuel outlet line feeding a multi-positional fuel control valve, said multi-positional manual control valve comprising a control block with a single control cylinder that is rotatable between a first angular position to feed a first injector fuel supply line and a first pilot burner fuel supply line and a second angular position to feed a second injector fuel supply line and a second pilot burner supply line; said first injector fuel supply line and the first pilot burner fuel supply line each having a composition and configuration for transporting the first type of fuel at desired flow rates, said second injector fuel supply line and the second pilot burner fuel supply line each having a composition and configuration for transporting the second type of fuel at a desired flow rate, said control block of said multi-positional control valve having a cylindrical aperture, the cylindrical aperture having a first, second and third fuel injector apertures extending from said cylindrical aperture to a first, second and third side of said control block, respectively, a first, second and third pilot aperture is axially aligned about said cylindrical aperture with each of said first, second and third fuel injector apertures, respectively, said control cylinder having a circumference proximate the circumference of said cylindrical aperture wherein said control cylinder is closely received within said cylindrical aperture, said control cylinder having an “L” shaped flow through fuel injector aperture and an axially aligned “L” shaped flow through pilot aperture, said control cylinder rotatable between the first angular position and the second angular position within said cylindrical aperture in said control block, at said first angular position said first fuel injector aperture and said first pilot aperture extending to said first side of said control block are in flow communication with said third fuel injector aperture and said third pilot aperture extending to said third side of said control block, at said second angular position said second fuel injector aperture and said second pilot aperture extending to said second side of said control block are in flow communication with said third fuel injector aperture and said third pilot aperture extending to said third side of said control block, the first fuel injector aperture coupled to the first injector fuel supply line, the first pilot aperture coupled to the first pilot burner fuel supply line, the second fuel injector aperture coupled to the second fuel injector supply line, the second pilot aperture coupled to the second pilot burner fuel supply line, the third fuel injector aperture coupled to the injector fuel outlet line of the thermostatic control valve, the third pilot aperture coupled to the pilot fuel outlet line of the thermostatic control valve. 11. The dual fuel gas heater of claim 10 further comprising an oxygen detection system, said oxygen detection system having a temperature sensor in proximity to one or both of said first and second pilot flame burners. 12. The dual fuel gas heater of claim 11 wherein said thermostat control valve is electrically coupled to the temperature sensor and configured to shut off the flow of fuel to the injector fuel outlet line and the pilot burner fuel outlet line upon receiving a shut off signal from the temperature sensor. 13. The dual fuel gas heater of claim 10 wherein said first type of fuel is natural gas and said second type of fuel is liquid propane gas.