[특허]Dual fuel vent free gas heater

Coprecitec, S.L.

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특허 상세정보

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Dual fuel vent free gas heater

특허상세정보
국가/구분	United States(US) Patent 등록
국제특허분류(IPC7판)	F23Q-009/00
미국특허분류(USC)	431/278; 431/280; 431/281
출원번호	US-0237131 (2008-09-24)
등록번호	US-8118590 (2012-02-21)
발명자 / 주소	Manning, John Stephen (Steve) Antxia Uribetxebarria, José Joaquín Mateos Martin, Ruben
출원인 / 주소	Coprecitec, S.L.
대리인 / 주소	Kitchen, Tim L.
인용정보	피인용 횟수 : 2 인용 특허 : 83

초록

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

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1. A dual fuel gas heater comprising: a gas burner,a first pilot burner,a control valve situated to delivery either a first fuel or a second fuel to the gas burner and to the first pilot burner,a first temperature sensor located adjacent the first pilot burner,a second temperature sensor located inside or in proximity to the gas burner,the control valve electrically coupled to the first and second temperature sensors and configured to close when the temperature sensed the by the first temperature sensor exceeds a first control temperature or when the temperature sensed by the second temperature sensor exceeds a second control temperature. 2. A dual fuel gas heater according to claim 1, wherein the first control temperature and the second control temperature are substantially the same. 3. A dual fuel gas heater according to claim 1, wherein the first temperature sensor is a thermocouple that generates an electrical voltage deliverable to the control valve upon being heated by a pilot flame emitted by the first pilot burner, when the temperature at the thermocouple is at a temperature above or equal to a third control temperature the thermocouple produces a voltage sufficient to cause the control valve to maintain or assume an open position to permit the flow of fuel to the gas burner and to pilot burner, the control valve configured to close when the temperature of the thermocouple is below the third control temperature. 4. A dual fuel gas heater according to claim 3, wherein a temperature below the third control temperature is indicative of a low ambient oxygen level. 5. A dual fuel gas heater according to claim 3, wherein the first control temperature and second control temperature are indicative of an inappropriate fuel being supplied to the gas burner and wherein a temperature below the third control temperature is indicative of a low ambient oxygen level. 6. A dual fuel gas heater according to claim 1, wherein the first control temperature and the second control temperature are indicative of an inappropriate fuel being supplied to the gas burner. 7. A dual fuel gas heater according to claim 1, wherein the first fuel is natural gas and the second fuel is liquid propane. 8. A dual fuel gas heater according to claim 1, wherein the first pilot burner comprises: a first conduit for receiving the first fuel,a second conduit for receiving the second fuel,a single nozzle for supplying the pilot flame, the single nozzle in fluid communication with the first conduit and the second conduit. 9. A dual fuel gas heater according to claim 8, further comprising a single igniter positioned to cause an ignition of the pilot flame at the single nozzle. 10. A dual fuel gas heater according to claim 9, wherein the temperature sensor is a single thermocouple. 11. A dual gas heater according to claim 8, wherein the first conduit, second conduit and single nozzle each have a central axis, the central axis of the first conduit forming a first angle in relation to the central axis of the single nozzle, the central axis of the second conduit forming a second angle in relation to the central axis of the single nozzle, and the first angle and second angle being equal. 12. A dual gas heater according to claim 8, wherein the first conduit has a first restriction of a first cross-sectional area and the second conduit has a second restriction of a second cross-sectional area, the second cross-sectional area being less than the first cross-sectional area. 13. A dual fuel gas heater according to claim 12, wherein the first fuel is natural gas and the second fuel is liquid propane. 14. A dual gas heater according to claim 8, wherein the first conduit has a first restriction of a first diameter and the second conduit has a second restriction of a second diameter, the second diameter being less than the first diameter. 15. A dual fuel heater according to claim 14, wherein the first diameter is approximately 0.30 mm and the second diameter is greater than or equal to approximately 0.42 mm. 16. A dual fuel heater according to claim 1 comprising a second pilot burner, a first injector positioned at an inlet of the gas burner, a second injector positioned at the inlet of the gas burner, the control valve situated to deliver the first fuel to the first injector and to the first pilot burner or to deliver the second fuel to the second injector and to the second pilot burner. 17. A dual fuel heater according to claim 16, further comprising: a pilot burner control valve situated in the flow path between the control valve and the first and second pilot burners, the pilot burner control valve having a first control position and a second control position, the first control position permitting fuel flow only to the first pilot burner, the second control position permitting fuel flow only to the second pilot burner, andan injector control valve situated in the flow path between the control valve and the first and second injectors, the injector control valve having a first control position and a second control position, the first control position permitting fuel flow only to the first injector, the second control position permitting fuel flow only to the second injector. 18. A dual fuel heater according to claim 16, further comprising a multi-positional control valve situated in the flow path between the control valve and the first and second pilot burners and the first and second injectors, the multi-positional control valve rotatable between a first angular position and a second angular position, in the first angular position the multi-positional control valve permitting the flow of fuel only to the first pilot burner and to the first injector, in the second angular position the multi-positional control valve permitting the flow of fuel only to the second pilot burner and to the second injector. 19. A dual fuel heater according to claim 18, wherein the multi-positional control valve comprising a control block 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 the control block, respectively, a first, second and third pilot aperture is axially aligned about the cylindrical aperture with each of the first, second and third fuel injector apertures, respectively, the control cylinder having a circumference proximate the circumference of the cylindrical aperture wherein the control cylinder is closely received within the cylindrical aperture, the 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 the cylindrical aperture in the control block, at the first angular position the first fuel injector aperture and the first pilot aperture extending to the first side of the control block are in flow communication with the third fuel injector aperture and the third pilot aperture extending to the third side of the control block to permit a flow of fuel from the control valve to the first pilot burner and the first injector, at the second angular position the second fuel injector aperture and the second pilot aperture extending to the second side of the control block are in flow communication with the third fuel injector aperture and the third pilot aperture extending to the third side of the control block to permit a flow of fuel from the control valve to the second pilot burner and to the second injector. 20. A dual fuel heater according to claim 1 further comprising a second pilot burner and a third temperature sensor located adjacent the second pilot burner, the control valve electrically coupled to the third temperature sensor and configured to close when the temperature sensed the by the third temperature sensor exceeds a third control temperature. 21. A dual fuel gas heater according to claim 20, wherein the first control temperature, the second control temperature and the third control temperature are substantially the same.

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이 특허를 인용한 특허 (2)

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Dual fuel vent free gas heater

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Dual fuel vent free gas heater

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인용문헌 (83)

이 특허를 인용한 특허 (2)

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