EP3839352A1 - Ensemble thermoélectrique pour alimenter une pluralité de vannes électromagnétiques d'un appareil de cuisson - Google Patents

Ensemble thermoélectrique pour alimenter une pluralité de vannes électromagnétiques d'un appareil de cuisson Download PDF

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Publication number
EP3839352A1
EP3839352A1 EP19383142.7A EP19383142A EP3839352A1 EP 3839352 A1 EP3839352 A1 EP 3839352A1 EP 19383142 A EP19383142 A EP 19383142A EP 3839352 A1 EP3839352 A1 EP 3839352A1
Authority
EP
European Patent Office
Prior art keywords
transistor
current circuit
thermoelectric assembly
power supply
assembly according
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.)
Pending
Application number
EP19383142.7A
Other languages
German (de)
English (en)
Inventor
Mikel Arizmendi Zurutuza
Marcos Pablo Curto
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.)
Orkli SCL
Original Assignee
Orkli SCL
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 Orkli SCL filed Critical Orkli SCL
Priority to EP19383142.7A priority Critical patent/EP3839352A1/fr
Priority to US17/117,556 priority patent/US11908618B2/en
Priority to BR102020025930-0A priority patent/BR102020025930A2/pt
Publication of EP3839352A1 publication Critical patent/EP3839352A1/fr
Pending 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
    • F24—HEATING; RANGES; VENTILATING
    • F24C—DOMESTIC STOVES OR RANGES ; DETAILS OF DOMESTIC STOVES OR RANGES, OF GENERAL APPLICATION
    • F24C3/00—Stoves or ranges for gaseous fuels
    • F24C3/12—Arrangement or mounting of control or safety devices
    • F24C3/126—Arrangement or mounting of control or safety devices on ranges

Definitions

  • the present invention relates to a thermoelectric assembly for powering a plurality of electromagnetic valves of a cooking appliance, each electromagnetic valve allowing or preventing the passage of gas to a respective burner of the cooking appliance.
  • thermocouple connected to a respective electromagnetic valve
  • thermoelectric current which is capable of keeping the electromagnetic valve energized at a given time, allowing the passage of gas to the corresponding burner.
  • EP 0288390 A1 furthermore describes electric circuits in which a MOSFET is arranged between the thermocouple and the electromagnetic valve, said MOSFET acting like a switch, such that depending on pre-established parameters, the MOSFET can open the circuit preventing the passage of current to the electromagnetic valve, and therefore causing the electromagnetic valve to close the passage of gas to the burner regardless of the presence of flame in the corresponding burner.
  • thermoelectric circuits of this type with power supplies including transformers for galvanically isolating said thermoelectric circuits is also known, as described in US 2019/0195507 A1 .
  • the object of the invention is to provide a thermoelectric assembly for powering a plurality of electromagnetic valves of a cooking appliance, each electromagnetic valve being configured for closing the passage of gas to a corresponding burner of the cooking appliance, as defined in the claims.
  • thermoelectric assembly comprises a main current circuit associated with a respective electromagnetic valve, the main current circuit comprising a thermocouple configured for detecting flame in the corresponding burner, a cable connected to the thermocouple and configured for electrically connecting said thermocouple with the corresponding electromagnetic valve, and a transistor connected to the cable and configured for de-energizing the electromagnetic valve.
  • the main current circuit comprises a connection module comprising a power supply connected to the transistor, input terminals configured for being connected to an external energy source, a rectifier configured for transforming the alternating current of the external energy source into direct current, and a resistive block connected between one of the input terminals and the rectifier and configured for minimizing the current circulating through the power supply to a value equivalent to the galvanic isolation.
  • thermoelectric assembly having a main current circuit with a basic and simple power supply is thereby obtained, without having to include a transformer in said power supply for obtaining the required galvanic isolation.
  • the power supply will thus be simpler and more cost-effective, and is therefore integrated in the main current circuit, particularly in the connection module together with the transistor.
  • a main current circuit that is compact, simple, and can be readily connected to the external energy source is thereby obtained.
  • FIG. 1 shows a thermoelectric assembly 100 according to the invention suitable for powering a plurality of electromagnetic valves 6 and 6' of a cooking appliance (not depicted in the drawings), each electromagnetic valve 6 and 6' being configured for closing the passage of gas to a corresponding burner (not depicted in the drawings) of the cooking appliance.
  • the thermoelectric assembly 100 comprises a main current circuit 1 associated with a respective electromagnetic valve 6.
  • the main current circuit 1 comprises a thermocouple 2 configured for detecting flame in the corresponding burner, cables 3 and 4 connected to the thermocouple 2 and configured for electrically connecting said thermocouple 2 with the corresponding electromagnetic valve 6 through a connector 5, a transistor 9 connected to one of the cables 3 and configured for de-energizing the electromagnetic valve 6, and a connection module 20 comprising a power supply 10 connected to the transistor 9.
  • the transistor 9 is a field-effect transistor, preferably a MOSFET type transistor.
  • the transistor 9 comprises a port terminal 9a, a drain terminal 9b, and a source terminal 9c, said transistor 9 being connected to the power supply 10 through the port terminal 9a and source terminal 9c.
  • the transistor 9 behaves like a switch. In particular, when it operates in the cut-off region conduction between the source terminal 9c and the drain terminal 9b does not occur, so it operates like an open switch regardless of whether or not the thermocouple 2 detects the presence of flame, and therefore the electromagnetic valve is kept de-energized, preventing the passage of gas to the corresponding burner.
  • the power supply 10 When the power supply 10 is connected to the external energy source 8, it powers the transistor 9 which operates like a closed switch, the electromagnetic valve is kept energized as long as the thermocouple 2 detects flame in the burner and a thermoelectric current capable of keeping the electromagnetic valve energized is generated.
  • the transistor 9 has two connection terminals 27 and 28, each of which is connected to the cable 3 of the thermocouple 2.
  • the power supply 10 comprises two input terminals 22 and 23 configured for being connected to the external energy source 8, a rectifier 11 configured for transforming the alternating current of the external energy source 8 into direct current, and a resistive block 14 connected between one of the input terminals 22 and 23 and the rectifier 11, the resistive block 14 being configured for minimizing the current circulating through the power supply 10 to a value equivalent to the galvanic isolation.
  • the resistance of the resistive block 14 is about 2.24 mohms.
  • the power supply 10 comprises two resistive blocks 14, each of them connected to the corresponding input terminal 22 and 23.
  • each resistive block 14 comprises at least two resistors 14a and 14b arranged such that they are connected in series.
  • the resistance resulting from the two resistive blocks 14 is about 2.24 mohms.
  • the power supply 10 further comprises capacitance filters 12 connected in parallel to one another and in parallel to the rectifier 11, the capacitance filters 12 being configured for filtering or smoothing out ripple, resulting in a direct current whose voltage would virtually not vary over time.
  • the power supply 10 further comprises a diode 13 connected in parallel to the rectifier 11 and to the capacitance filters 12.
  • the rectifier 11 is a diode bridge.
  • first input terminal 22 and the second input terminal 23 of the power supply 10 are configured for being connected with the external energy source 8, providing a form-fitting connection with the external energy source 8.
  • This form-fitting connection is a simple and quick assembly/disassembly connection.
  • the first input terminal 22 and the second input terminal 23 of the main current circuit 1 are configured for being connected, providing a male-female attachment.
  • the connection module 20 of the main current circuit 1, shown in Figure 2 comprises a body 21 inside which there is housed the power supply 10 and the transistor 9, with the input terminals 22 and 23 projecting from the body 21.
  • the body 21 is made of an insulating material and comprises a corresponding cover 26 which closes the housing where the power supply 10 and the transistor 9 are arranged.
  • the power supply 10 and the transistor 9 are assembled on a PCB (not depicted) housed inside the body 21.
  • the power supply 10 comprises an output terminal 24 projecting from the body 21.
  • the input terminals 22 and 23 and the output terminal 24 project towards the outside orthogonal to the cover 26.
  • connection module 20 of the main current circuit 1 may comprise an additional output terminal (not depicted) configured for connecting with a presence sensor for detecting the presence of utensils associated with the corresponding burner. Said additional output terminal will provide a form-fitting connection with the corresponding presence sensor.
  • the main current circuit 1 further comprises a discharge resistor 15 of the transistor, said discharge resistor 15 being connected in parallel to the transistor 9, said discharge resistor 15 assuring the opening of the transistor 9 when said transistor 9 is no longer powered by the power supply 10.
  • the discharge resistor 15 is arranged such that it is housed in the body 21 of the connection module 20. In particular, the discharge resistor 15 is assembled on the PCB together with the transistor 9 and the power supply 10.
  • the main current circuit 1 also comprises a safety resistor 16 connected in series with the port 9a of the transistor 9. Said safety resistor 16 limits the current that would go to the main current circuit 1 from the power supply 10 in the event of a short-circuit failure of the transistor 9.
  • the discharge resistor 16 is arranged such that it is housed in the body 21 of the connection module 20. In particular, the discharge resistor 16 is assembled on the PCB together with the transistor 9 and the power supply 10.
  • an electromechanical switch 25 is arranged between the power supply 10 and the power supply external 8.
  • the switch 25 can be connected between the power supply 10 and the transistor 9.
  • the connection module 20 houses the switch 27 in the body 21.
  • the switch 27 is assembled on the PCB housed inside the body 21.
  • the power supply 10 powers the transistor 9 such that the transistor 9 allows current to pass therethrough.
  • the switch 27 closed, if the thermocouple 2 detects the presence of flame, it will generate a thermoelectric current that goes through the transistor 9 keeping the electromagnetic valve 6 such that it allows the passage of gas to the burner.
  • the thermocouple 2 does not detect any flame, and therefore no longer generate the thermoelectric current required for keeping the electromagnetic valve 6 energized, said electromagnetic valve 6 closes the passage of gas.
  • the transistor 9 When the corresponding signal is sent to the switch 27 from a non-depicted control so as to open said switch 27, the transistor 9 is not powered, so it acts like an open switch, not allowing current to go from the thermocouple 2 to the electromagnetic valve 6, the passage of gas is thereby closed.
  • the transistor 9 therefore allows acting on the electromagnetic valve 6 de-energizing it when a previously defined parameter is achieved, said parameter not being the presence of flame in the burner 2.
  • the thermoelectric assembly 100 further comprises at least one additional current circuit 1' associated with a respective electromagnetic valve 6', said additional current circuit 1' being able to be connected to the main current circuit 1.
  • the thermoelectric assembly 100 comprises two additional current circuits 1', each of them associated with a respective electromagnetic valve 6'. Regardless of whether the thermoelectric assembly 100 includes one, two, or a plurality of additional current circuits, the features of each additional current circuit are similar and will be described below.
  • Each additional current circuit 1' comprises a thermocouple 2' configured for detecting flame in the corresponding burner, cables 3' and 4' connected to the corresponding thermocouple 2' and configured for electrically connecting said thermocouple 2' with the corresponding electromagnetic valve 6' through a connector 5', and a transistor 9' connected to the corresponding cable 3' and configured for de-energizing the electromagnetic valve 6' to which it is connected.
  • Each transistor 9' of the respective additional current circuit 1' has the same features and operates in the same manner as the transistor 9 of the main current circuit 1, so what has been described above is applicable to the transistors of the additional current circuits.
  • the features of the thermocouple 2' of each additional current circuit 1' are similar to those of thermocouple 2.
  • the features of the cables 3' and 4' for connecting the thermocouple 2' to the electromagnetic valve 6' in the additional current circuit 1' are similar to those of the cables 3 and 4 of the main current circuit 1, so what is described above in relation to these elements for the main current circuit is applicable to the additional current circuits.
  • Each additional current circuit 1' comprises a connection module 20' housing the corresponding transistor 9', each connection module 20' comprising an input terminal 22' connected to the corresponding transistor 9'.
  • the input terminal 22' is connected to the port 9a' of the respective transistor 9'.
  • the connection module 20' of each additional current circuit 1' shown in Figures 2 and 4 , comprises an output terminal 24'.
  • Each input terminal 22' of the corresponding additional current circuit 1' is configured for being connected to the output terminal 24 of the connection module 20 of the main current circuit 1 or to the output terminal 24' of another connection module 20' of the additional current circuit 1'.
  • one of the additional current circuits 1' (hereinafter, first additional current circuit 1') is connected to the main current circuit 1 through respective connection modules 20 and 20'.
  • the input terminal 22' of the connection module 20' of the first additional current circuit 1' is connected to the output terminal 24 of the main current circuit 1 as shown in Figure 2 .
  • both additional current circuits 1' and 1" are connected to one another through respective connection modules 20'.
  • the input terminal 22' of the connection module 20' of another additional current circuit 1" (hereinafter, second additional current circuit 1") is connected to the output terminal 24' of the connection module 20' of the first additional current circuit 1'.
  • the output terminal 24 of the connection module 20 of the main current circuit 1 and the input terminal 22' of the connection module 20' of an additional current circuit 1' are configured for being connected, providing a form-fitting connection.
  • This form-fitting connection is a simple and quick assembly/disassembly connection.
  • the output terminal 24 of the connection module 20 of the main current circuit 1 and the input terminal 22' of the connection module 20' of the first additional current circuit 1' are configured for being connected, providing a male-female attachment.
  • the output terminal 24' of the connection module 20' of the first additional current circuit 1' and the input terminal 22' of the connection module 20' of the second additional current circuit 1' are configured for being connected, providing a form-fitting connection.
  • This form-fitting connection is a simple and quick assembly/disassembly connection.
  • the output terminal 24' of the connection module 20' of the first additional current circuit 1 and the input terminal 22' of the connection module 20' of the second additional current circuit 1' are configured for being connected, providing a male-female attachment.
  • connection module 20' of each additional current circuit 1' comprises a body 21' inside which there is housed the respective transistor 9', with the input terminal 22' and the respective output terminal 24' projecting towards the outside of the respective body 21'.
  • Each body 21' is made of an insulating material.
  • Each body 21' comprises a corresponding cover 26' which closes the corresponding housing.
  • the input terminal 22' and the output terminal 24' of the connection module 20' of the corresponding additional current circuit 1' project towards the outside orthogonal to the cover 26'.
  • connection module 20' of each additional current circuit 1' may comprise an additional output terminal (not depicted) configured for connecting with a presence sensor for detecting the presence of utensils associated with the corresponding burner. Said additional output terminal will provide a form-fitting connection with the corresponding presence sensor.
  • Each additional current circuit 1' further comprises a discharge resistor 15' of the transistor 9', said discharge resistor 15' being connected in parallel to the transistor 9' and configured for assuring the opening of the transistor 9' when said transistor 9' is no longer powered by the power supply 10.
  • the discharge resistor 15' is arranged such that it is housed in the body 21' of the connection module 20'. In particular, the discharge resistor 15' is assembled on the PCB together with the transistor 9'.
  • Each additional current circuit 1' comprises a safety resistor 16 connected in series with the port 9a' of the transistor 9' and configured for limiting the current that would go to the additional current circuit 1' from the power supply 10 in the event of a short-circuit failure of the corresponding transistor 9'.
  • the discharge resistor 16' is arranged such that it is housed in the body 21' of the respective connection module 20'. In particular, the discharge resistor 16' is assembled on the PCB together with the respective transistor 9'.
  • Each additional current circuit 1' further comprises a diode 13' connected between the discharge resistor 15' and the safety resistor 16, and in parallel to the transistor 9'.
  • the output terminal 24' of the connection module 20' of the corresponding additional current circuit 1' is connected between the discharge resistor 15' of the additional current circuit 1' and the safety resistor 16' of the respective additional current circuit 1'.
  • the thermoelectric assembly may comprise a single additional current circuit or a plurality of additional current circuits that can be connected to one another through respective connection modules, the single additional current circuit or a circuit of the plurality of additional current circuits being arranged such that it is connected to the main current circuit.
  • a thermoelectric assembly in which the circuits associated with the thermocouples can be quickly coupled to one another is thereby obtained, with the power supply being integrated in one of said circuits.
  • a modular solution that can be scaled according to needs and readily detachable from one another is thereby provided.
  • the features of the single additional current circuit or of each of the additional current circuits of the plurality of additional current circuits are those described for the two additional current circuits of the embodiment shown in the drawings.
  • thermoelectric assembly 100 operates in the following manner, when the switch 25 is closed and the main current circuit 1 connected to the external energy source 8, the power supply 10 powers the transistors 9 and 9' of the main current circuit 1 and of the respective additional current circuits 1', said transistors 9 and 9' acting like closed switches allowing the thermoelectric current which is generated in the respective thermocouple 2 and 2' when there is flame in the corresponding burner to energize the respective electromagnetic valve 6 and 6'.
  • the switch 25 opens such that the transistors 9 and 9' of the main current circuit 1 and of the additional current circuits 1' are not powered and act like open switches, the corresponding electromagnetic valve 6 and 6' being de-energized.

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
EP19383142.7A 2019-12-19 2019-12-19 Ensemble thermoélectrique pour alimenter une pluralité de vannes électromagnétiques d'un appareil de cuisson Pending EP3839352A1 (fr)

Priority Applications (3)

Application Number Priority Date Filing Date Title
EP19383142.7A EP3839352A1 (fr) 2019-12-19 2019-12-19 Ensemble thermoélectrique pour alimenter une pluralité de vannes électromagnétiques d'un appareil de cuisson
US17/117,556 US11908618B2 (en) 2019-12-19 2020-12-10 Thermoelectric assembly for powering electromagnetic valves of a cooking appliance
BR102020025930-0A BR102020025930A2 (pt) 2019-12-19 2020-12-17 Conjunto termoelétrico para alimentar uma série de válvulas eletromagnéticas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP19383142.7A EP3839352A1 (fr) 2019-12-19 2019-12-19 Ensemble thermoélectrique pour alimenter une pluralité de vannes électromagnétiques d'un appareil de cuisson

Publications (1)

Publication Number Publication Date
EP3839352A1 true EP3839352A1 (fr) 2021-06-23

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EP19383142.7A Pending EP3839352A1 (fr) 2019-12-19 2019-12-19 Ensemble thermoélectrique pour alimenter une pluralité de vannes électromagnétiques d'un appareil de cuisson

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EP (1) EP3839352A1 (fr)
BR (1) BR102020025930A2 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9956515B2 (en) 2012-07-11 2018-05-01 Mann+Hummel Gmbh Air filter operable for filtering cabin air in vehicles, agricultural machinery, construction equipment and other work machines

Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2123458A1 (de) * 1971-05-12 1972-11-23 Industrie A. Zanussi S.P.A., Pordenone (Italien) Selbsttätiges Sicherheitszünd- und Kontrollgerät der Flamme von Gasbrennern
DE2306544A1 (de) * 1973-02-10 1974-08-15 Diehl Fa Abschaltsteuerung fuer gasheizstellen
GB1524056A (en) * 1974-11-27 1978-09-06 Philips Nv Combined valve and fuel gas burner
EP0288390A1 (fr) 1987-04-24 1988-10-26 Chaffoteaux & Maury Perfectionnements aux dispositifs de sécurité pour vannes à gaz
US20190078781A1 (en) * 2015-07-17 2019-03-14 Eltek S.P.A. Device for managing gas appliances, and corresponding systems and methods
US20190195507A1 (en) 2017-11-30 2019-06-27 Castfutura S.P.A. Magnet-themocouple system for fail-safe supply of gas to burners or the like

Patent Citations (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2123458A1 (de) * 1971-05-12 1972-11-23 Industrie A. Zanussi S.P.A., Pordenone (Italien) Selbsttätiges Sicherheitszünd- und Kontrollgerät der Flamme von Gasbrennern
DE2306544A1 (de) * 1973-02-10 1974-08-15 Diehl Fa Abschaltsteuerung fuer gasheizstellen
GB1524056A (en) * 1974-11-27 1978-09-06 Philips Nv Combined valve and fuel gas burner
EP0288390A1 (fr) 1987-04-24 1988-10-26 Chaffoteaux & Maury Perfectionnements aux dispositifs de sécurité pour vannes à gaz
US20190078781A1 (en) * 2015-07-17 2019-03-14 Eltek S.P.A. Device for managing gas appliances, and corresponding systems and methods
US20190195507A1 (en) 2017-11-30 2019-06-27 Castfutura S.P.A. Magnet-themocouple system for fail-safe supply of gas to burners or the like

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US9956515B2 (en) 2012-07-11 2018-05-01 Mann+Hummel Gmbh Air filter operable for filtering cabin air in vehicles, agricultural machinery, construction equipment and other work machines

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