EP0288390A1 - Sicherheitsvorrichtung für Gasventile - Google Patents

Sicherheitsvorrichtung für Gasventile Download PDF

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Publication number
EP0288390A1
EP0288390A1 EP88400980A EP88400980A EP0288390A1 EP 0288390 A1 EP0288390 A1 EP 0288390A1 EP 88400980 A EP88400980 A EP 88400980A EP 88400980 A EP88400980 A EP 88400980A EP 0288390 A1 EP0288390 A1 EP 0288390A1
Authority
EP
European Patent Office
Prior art keywords
valve
coil
thermocouple
flap
electric switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP88400980A
Other languages
English (en)
French (fr)
Inventor
Claude Dauget
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Chaffoteaux et Maury SAS
Original Assignee
Chaffoteaux et Maury SAS
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Chaffoteaux et Maury SAS filed Critical Chaffoteaux et Maury SAS
Publication of EP0288390A1 publication Critical patent/EP0288390A1/de
Withdrawn legal-status Critical Current

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/02—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium
    • F23N5/10—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples
    • F23N5/102—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using electronic means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2227/00—Ignition or checking
    • F23N2227/22—Pilot burners

Definitions

  • the invention relates to the safety devices associated with the fuel gas supply valves of the burners fitted to heating appliances such as water heaters, bath heaters, boilers, etc. equipped with a pilot light.
  • valves which include a gas valve capable of being cocked by hand in its open position, this valve being associated with an electromagnetic coil in such a way as to maintain it in the open or armed position.
  • the valve is provided by circulation in the coil of the electric current generated by the simple heating of a thermocouple by the pilot.
  • these safety devices include an electrical switch mounted on the circuit which connects the thermocouple to the coil.
  • thermocouple As the potential difference generated by the thermocouple is relatively small, namely of the order of a few tens of mV, it is important that the overall electrical resistance of the circuit considered is itself very low, namely generally less than 100 milli-ohms (m ⁇ ).
  • the object of the invention is, above all, to eliminate these latter drawbacks.
  • the safety devices of the type in question according to the invention are essentially characterized in that their electrical switches as defined above are constituted by MOS type transistors having a very low drain-source resistance to the conductive state, this resistance preferably being less than 30 m ⁇ .
  • the invention includes, apart from this main arrangement, certain other arrangements which are preferably used at the same time and which will be more explicitly discussed below.
  • FIGS 1 and 2 schematically show a safety device established according to the invention respectively in operation, pilot light on, and at rest, pilot light off.
  • the safety device considered is associated with a burner 1 capable of being supplied with combustible gas from a pipe 2 through successively a safety valve 3 and a terminal gas valve 4.
  • the purpose of the device is to exercise safety from certain dangers (air pollution, fouling of a duct, breakdown of ventilation, lack of water, etc.) by automatically closing valve 3 as soon as predetermined thresholds are crossed by appropriate parameters representative of these hazards.
  • valve 3 By extension it can also be envisaged that the indicated automatic closing of the valve 3 is triggered by phenomena which are not particularly dangerous but which are interesting to consider in certain circumstances, such as a temperature (ambient temperature, water temperature circulating in a central heating circuit ).
  • the safety valve 3 is composed of a "magnetic plug" itself comprising a gas valve 5 suitable for cooperating with a seat 6 and secured to a rod 7 comprising at one of its ends a clean magnetic pallet 8 closing the magnetic field lines of a U-shaped magnetic circuit 9 on which a coil 10 is wound.
  • the coil 10 of the electromagnet thus formed is supplied with direct current, via a circuit 11, from a thermocouple 12 capable of being placed in the flame 13 of a pilot light.
  • This pilot light 13 is itself supplied by the combustible gas withdrawn, downstream of the valve 3, in a section of pipe 14 connecting this valve to the gas valve 4.
  • thermocouple 12 The electric current i generated by the thermocouple 12 when the latter is heated by the pilot 13 is very low.
  • this switch was constituted by a mechanical contact in the previously known embodiments: such an embodiment seemed inevitable due to the extreme smallness required for the internal electrical resistance of the contact in question.
  • such a MOS transistor is used to constitute the electrical contact 16 of the circuit 11.
  • the MOS transistor is a field effect transistor whose gate or base is isolated by a very insulating layer of silicon oxide.
  • the device 17 shows schematically a device capable of detecting the parameter (degree of pollution, temperature, etc.) whose progression beyond a predetermined threshold must automatically trigger the closing of the valve 3.
  • This device is arranged so as to develop a DC voltage of low amplitude which is applied to the base of the transistor 16 as long as the threshold in question is not crossed, said voltage canceling out automatically as soon as said threshold is crossed.
  • the transistor 16 is conductive, its internal resistance is very low and its presence in the circuit 11 practically does not affect the intensity of the current i when this current is generated by thermocouple 12.
  • Burner 1 then ignites automatically as soon as that the gas valve 4 is open, this opening being controlled for example by drawing domestic hot water in the case of a water heater or bath heater.
  • the burner 1 then goes out as soon as said gas valve 4 is closed.
  • thermocouple 12 If the pilot light 13 goes out, for example following a gale or an air discharge, the thermocouple 12 is no longer heated, the current i generated by heating this thermocouple is canceled and the same applies to the force F: the return force R of the spring 15 then closes the valve 3 by applying the valve 5 against its seat 6.
  • This device has a certain number of advantages compared to those previously known, in particular with regard to the reliability and the longevity of the safety contact 16 because it is produced by static semiconductor elements which are much less vulnerable. as mechanical contacts with moving parts.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Magnetically Actuated Valves (AREA)
  • Control Of Combustion (AREA)
EP88400980A 1987-04-24 1988-04-21 Sicherheitsvorrichtung für Gasventile Withdrawn EP0288390A1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR8705823 1987-04-24
FR8705823A FR2614385B1 (fr) 1987-04-24 1987-04-24 Perfectionnements aux dispositifs de securite pour vannes a gaz

Publications (1)

Publication Number Publication Date
EP0288390A1 true EP0288390A1 (de) 1988-10-26

Family

ID=9350446

Family Applications (1)

Application Number Title Priority Date Filing Date
EP88400980A Withdrawn EP0288390A1 (de) 1987-04-24 1988-04-21 Sicherheitsvorrichtung für Gasventile

Country Status (2)

Country Link
EP (1) EP0288390A1 (de)
FR (1) FR2614385B1 (de)

Cited By (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0643266A1 (de) * 1993-09-14 1995-03-15 ELECTROLUX SIEGEN GmbH Thermostrom-Schalter
ES2082669A1 (es) * 1991-07-12 1996-03-16 Teka Ind Sa Dispositivo de accionamiento de un grifo de gas, con seguridad de encendido y mando a distancia.
WO2002040923A1 (en) * 2000-11-16 2002-05-23 Fernando Teodoro Garcia Shut-off safety system and gas appliance including same
EP1236941A2 (de) * 2001-02-16 2002-09-04 HeaTec Thermotechnik GmbH Gasventil
EP1420206A1 (de) * 2002-11-13 2004-05-19 FAGOR, S.Coop Verbrennungsdetektionsvorrichtung mit einem thermoelektrischem Generator
AU2002214834B2 (en) * 2000-11-16 2006-11-16 Fernando Teodoro Garcia Shut-off safety system and gas appliance including same
EP1739351A1 (de) * 2005-06-30 2007-01-03 Orkli S. Coop. Stromversorgungsschaltung eines Sicherheitsventils für den Zündvorgang eines Gasbrenners
NL2004917C2 (en) * 2010-06-18 2011-12-20 Intell Properties B V Device and method for electrically controlled turning off of a gas flame of a gas hob.
EP3839352A1 (de) 2019-12-19 2021-06-23 Orkli, S. Coop. Thermoelektrische anordnung zur speisung einer vielzahl von elektromagnetischen ventilen eines kochgerätes
EP3839346A1 (de) 2019-12-19 2021-06-23 Orkli, S. Coop. Thermoelektrische anordnung zur speisung einer vielzahl von elektromagnetischen ventilen eines kochgerätes
EP3848632A1 (de) 2020-01-08 2021-07-14 Orkli, S. Coop. Thermoelektrische sicherheitsvorrichtung für die abwesenheit einer flamme in gasverbrennungssystemen

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565519A (en) * 1983-01-21 1986-01-21 Advanced Mechanical Technology, Inc. Burner ignition system

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4565519A (en) * 1983-01-21 1986-01-21 Advanced Mechanical Technology, Inc. Burner ignition system

Cited By (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
ES2082669A1 (es) * 1991-07-12 1996-03-16 Teka Ind Sa Dispositivo de accionamiento de un grifo de gas, con seguridad de encendido y mando a distancia.
EP0643266A1 (de) * 1993-09-14 1995-03-15 ELECTROLUX SIEGEN GmbH Thermostrom-Schalter
AU2002214834B2 (en) * 2000-11-16 2006-11-16 Fernando Teodoro Garcia Shut-off safety system and gas appliance including same
WO2002040923A1 (en) * 2000-11-16 2002-05-23 Fernando Teodoro Garcia Shut-off safety system and gas appliance including same
EP1236941A2 (de) * 2001-02-16 2002-09-04 HeaTec Thermotechnik GmbH Gasventil
EP1236941A3 (de) * 2001-02-16 2003-04-23 HeaTec Thermotechnik GmbH Gasventil
EP1420206A1 (de) * 2002-11-13 2004-05-19 FAGOR, S.Coop Verbrennungsdetektionsvorrichtung mit einem thermoelektrischem Generator
EP1739351A1 (de) * 2005-06-30 2007-01-03 Orkli S. Coop. Stromversorgungsschaltung eines Sicherheitsventils für den Zündvorgang eines Gasbrenners
NL2004917C2 (en) * 2010-06-18 2011-12-20 Intell Properties B V Device and method for electrically controlled turning off of a gas flame of a gas hob.
EP3839352A1 (de) 2019-12-19 2021-06-23 Orkli, S. Coop. Thermoelektrische anordnung zur speisung einer vielzahl von elektromagnetischen ventilen eines kochgerätes
EP3839346A1 (de) 2019-12-19 2021-06-23 Orkli, S. Coop. Thermoelektrische anordnung zur speisung einer vielzahl von elektromagnetischen ventilen eines kochgerätes
EP3848632A1 (de) 2020-01-08 2021-07-14 Orkli, S. Coop. Thermoelektrische sicherheitsvorrichtung für die abwesenheit einer flamme in gasverbrennungssystemen
WO2021140266A1 (es) 2020-01-08 2021-07-15 Orkli, S.Coop. Dispositivo de seguridad termoeléctrica ante ausencia de llama para sistemas de combustión de gas

Also Published As

Publication number Publication date
FR2614385B1 (fr) 1989-07-28
FR2614385A1 (fr) 1988-10-28

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