EP3771865A1 - Gas device for cooking food and method for operating said device - Google Patents
Gas device for cooking food and method for operating said device Download PDFInfo
- Publication number
- EP3771865A1 EP3771865A1 EP20188841.9A EP20188841A EP3771865A1 EP 3771865 A1 EP3771865 A1 EP 3771865A1 EP 20188841 A EP20188841 A EP 20188841A EP 3771865 A1 EP3771865 A1 EP 3771865A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- safety valve
- flame
- sensor
- burner
- safety
- 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.)
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Classifications
-
- 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
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N5/00—Systems for controlling combustion
- F23N5/24—Preventing development of abnormal or undesired conditions, i.e. safety arrangements
- F23N5/245—Preventing development of abnormal or undesired conditions, i.e. safety arrangements using electrical or electromechanical 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
- F24C3/128—Arrangement or mounting of control or safety devices on ranges in baking ovens
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2235/00—Valves, nozzles or pumps
- F23N2235/12—Fuel valves
- F23N2235/14—Fuel valves electromagnetically operated
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2237/00—Controlling
- F23N2237/02—Controlling two or more burners
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23N—REGULATING OR CONTROLLING COMBUSTION
- F23N2241/00—Applications
- F23N2241/08—Household apparatus
Definitions
- the invention relates to a gas device for cooking food and to a method for operating a gas cooking device.
- the invention relates to gas cooking devices such as stoves, ovens and kitchens.
- Gas food cooking devices are usually provided with one or more safety systems, which are designed to avoid dangerous situations.
- one of the most common safety system entails interrupting the supply of gas to the burner in which the flame is extinguished, which is generally detected by means of a flame sensor.
- the object of the invention is to provide a gas food cooking device, which is not affected by the drawbacks of the prior art discussed above; in particular, the object of the invention is to provide a gas food cooking device, which is safer than currently known devices and forbids uncontrolled gas outflows.
- the invention relates to a gas device for cooking food comprising:
- an automatic general blocking valve blocking the supply of gas and located just downstream of the connection to the domestic line ensures the totally safe operation of the cooking device.
- the second safety system ensures the complete safety of the cooking device.
- the object of the invention is to provide a method for operating a gas food cooking device, which is safe compared to known methods and forbids uncontrolled gas outflows.
- the invention relates to a method for operating a gas food cooking device as claimed in claim 10.
- reference number 1 indicates a gas food cooking device according to the invention.
- the cooking device is a stove.
- the cooking device 1 comprises a main gas supply duct 2, which is configured to be coupled to a domestic gas supply circuit 3 (which is schematically shown), at least one gas burner 4, which is connected to the main gas supply duct 2 by means of at least one connection valve 5, an ignition device 7, which is configured to selectively generate a spark 11d in the area of the burner 4, a safety assembly 9 and a casing 6 (which is schematically shown).
- the device 1 comprises a plurality of gas burners 4, each connected to the main gas supply duct 2 by means of a respective connection valve 5.
- connection valve 5 is an adjustment valve, which is controlled by a respective actuator 10.
- the actuator 10 is a knob.
- the manual adjustment of the actuator 10 determines the adjustment of the position of the respective connection valve 5. In this way, the quantity of gas supplied to the burner 4 and, as a consequence, the flame of the burner 4 are adjusted.
- the ignition device 7 is schematically shown in figure 1 by a broken line, whereas it is better visible in figure 2 .
- the ignition device 7 comprises a catenary 8, which comprises a pair of power supply cables 11a and a plurality of control switches 11b, which are connected in parallel between said cables 11a.
- the catenary comprises one switch 11b for each actuator 10.
- Each switch 11b is operated by a respective actuator 10. When a pressure is applied to the actuator 10, this normally determines the closing of the respective switch 11b of the catenary 8. In this way, an electrical connection is established between the power supply cables 11a so as to activate a known igniting circuit 11c, which ignites a series of sparks 11d in the area of the respective burner 4.
- the switches of the catenary 8 basically work as normally open switches.
- the casing 6 houses at least one portion of the main gas supply duct 2, the connection valves 5, the ignition device 7 and, preferably, also part of the safety device 9, as discussed more in detail below.
- the burners 4 and the actuators 10 On the outside of the casing 6 there are the burners 4 and the actuators 10.
- the safety assembly 9 comprises a safety valve 12 and a control device 13, which is configured to adjust the position of the safety valve 12.
- the safety valve 12 is an ON/OFF valve located along the main gas supply duct 2 upstream of said at least one connection valve 5. In the case discussed herein by way of example, there are different connection valves 5 and the safety valve 12 is located upstream of all connection valves 5.
- the safety valve 12 is located just downstream of the connection to the domestic gas supply circuit 3.
- the safety valve 12 is preferably arranged at a safety distance from the burners 4 or from possible hot areas of the cooking device 1.
- the safety valve 12 is preferably housed outside the casing 6.
- the body of the safety valve 12 is outside the casing 6, whereas the electric drive of the safety valve 12 and the control device 13 are preferably housed inside the casing 6.
- the control device 13 is configured to open the safety valve 12 when the ignition device 7 is activated and to close the safety valve 12 when given conditions occur.
- control device 13 is configured to open the safety valve 12 when at least one switch 11b of the catenary 8 of the ignition device 7 is closed by means of the respective actuator 10.
- the safety valve 12 is a normally closed solenoid valve, which is opened when the ignition device 7 is activated.
- the closing is regulated by the control device 13.
- control device 13 is configured to close the safety valve 12 in response to the operating conditions of at least one control element.
- control device 13 is configured to close the safety valve 12 based on the value of at least one operating parameter detected by means of at least one sensor 16.
- control device 13 receives signals from a plurality of sensors 16.
- the sensor 16 is a flame sensor arranged close to a respective burner 4.
- each burner 4 is associated with a sensor 16.
- the flame sensor 16 is in an OFF state when it does not detect any flame, whereas it is in an ON state when it detects the presence of a flame.
- Each flame sensor 16 preferably comprises a thermocouple.
- control device 13 is configured so as to close the safety valve 12 if all sensors 16 do not detect any flame following an attempt of ignition.
- the safety valve 12 is closed if an attempt of ignition (by means of the activation of the ignition device 7) is not followed by an actual ignition.
- control device 13 is preferably configured to activate the ignition device 7 when the flame extinguishes during the operation of at least one burner 4.
- the control device 13 activates the ignition device 7.
- the control device 13 is provided with an activation module 17 (shown in figure 1 ), which is configured to activate the ignition device 7.
- the safety valve 12 is immediately closed. In case there is at least one flame sensor 16 in the ON state (cooking currently happening), the safety valve 12 remains open and the connection valve 5 supplying the burner 4 is closed so that the latter cannot be ignited again.
- the closing of the connection valve 5 is preferably regulated by a further control (not shown), which is directly associated with the flame sensor 16. This logic is schematically shown in the flowchart of figure 4 .
- the safety assembly 9 is provided with a first safety system and with a second safety system.
- the first safety system comprises a flame sensor 16 and a respective first control device (not shown), which is configured to close the respective connection valve 5 when the flame sensor detects that the flame has extinguished.
- the second safety system comprises the ON/OFF safety valve 12 located along the main duct 2 upstream of said at least one connection valve 5; at least one control element and a second control device 13, which is configured to adjust the position of the safety valve 12 in response to the operating conditions of the control element.
- the second control device 13 is independent of the first control device.
- the second control device 13 operates in an independent manner and in parallel relative to the first control device.
- the safety device 9 tries to re-ignite it in order to continue the cooking. If this attempt is not successful, the connection valve 5 and the safety valve 12 are closed so as to avoid uncontrolled gas outflows.
- control device 13 can receive signals from further and/or different control elements and can be configured to close the safety valve 12 based on the conditions of these control elements.
- control device can also be configured to close the safety valve 12 after a given amount of time starting from the opening of the safety valve 12.
- the control device 13 closes the safety valve 12 when the counter 15 (whose count is activated simultaneously with the opening of the safety valve 12) reaches a given value.
- the programmed count can be of at least 4 hours.
- FIG. 5 schematically shows a different cooking device 20.
- the cooking device 20 is a gas oven, which comprises a main gas supply duct 22, which is configured to be coupled to a domestic gas supply circuit 23 (which is schematically shown), at least one gas burner 24, which is connected to the main gas supply duct 22 by means of at least one connection valve 25, an ignition device 27, which is configured to selectively generate a spark 11d in the area of the burner 24, a safety assembly 29 and a casing 26 (which is schematically shown).
- the device 20 comprises a burner 24, which is arranged so as to heat a cooking chamber 30. According to a variant, which is not shown herein, the device 20 comprises more than one burner.
- connection valve 25 is an adjustment valve, which is controlled by an actuator 31.
- the actuator 31 is a knob.
- the manual adjustment of the actuator 31 determines the adjustment of the position of the respective connection valve 25. In this way, the quantity of gas supplied to the burner 24 and, as a consequence, the flame of the burner 24 are adjusted.
- the ignition device 27 is schematically shown by a broken line and substantially has a structure that is similar to the one of the ignition device 7 described with reference to the cooking device 1.
- the casing 26 houses at least one portion of the main gas supply duct 22, the connection valve 25, the ignition device 27 and, preferably, also part of the safety device 29, as discussed more in detail below.
- the actuator 31 On the outside of the casing 6 there is the actuator 31.
- the safety assembly 29 comprises a safety valve 32 and a control device 33, which is configured to adjust the position of the safety valve 32.
- the safety valve 32 is an ON/OFF valve located along the main gas supply duct 22 upstream of said at least one connection valve 25.
- the safety valve 32 is located just downstream of the connection to the domestic gas supply circuit 23.
- the safety valve 32 is preferably arranged at a safety distance from the burners 24 or from possible hot areas of the cooking device 20 (such as for example the cooking chamber 30).
- the safety valve 32 is preferably housed outside the casing 26.
- the body of the safety valve 32 is outside the casing 26, whereas the electric drive of the safety valve 32 and the control device 33 are preferably housed inside the casing 26.
- the control device 33 is configured to open the safety valve 32 when the ignition device 27 is activated and to close the safety valve 32 based on the conditions of at least one control element.
- the safety valve 32 is a normally closed valve, which is opened when the ignition device 27 is activated.
- the closing is regulated by the control device 33.
- control device 33 is substantially configured similarly to the control device 13 of the cooking device 1.
- control device 33 is configured to close the safety valve 32 in response to the operating conditions of at least one control element.
- control device 33 is configured to close the safety valve 12 based on the value of at least one operating parameter detected by means of at least one sensor 36.
- the sensor 36 preferably is a flame sensor, which is located close to the burner 24.
- the flame sensor 36 is in an OFF state when it does not detect any flame, whereas it is in an ON state when it detects the presence of a flame.
- Each flame sensor 36 preferably comprises a thermocouple.
- control device 33 is configured so as to close the safety valve 32 if the sensor 36 does not detect any flame following an attempt of ignition.
- the safety valve 32 is closed if an attempt of ignition (by means of the activation of the ignition device 27) is not followed by an actual ignition.
- the safety valve 32 (which was opened upon activation of the ignition device 27) is immediately closed.
- connection valve 5 is preferably regulated by a further control, which is directly associated with the flame sensor 36.
- control device 33 is preferably configured to activate the ignition device 27 when the flame extinguishes during the operation of the burner 24.
- the control device 33 activates the ignition device 27. If the flame sensor 36 does not switch to the ON state within a given amount of time T, the safety valve 32 is immediately closed.
- the safety device 29 tries to re-ignite it in order to continue the cooking. If this attempt is not successful, the safety valve 32 is closed so as to avoid uncontrolled gas outflows.
- the closing logic of the safety valve 32 is the same as the one adopted for the stove 1. In other words, if there are different burners, the safety valve 32 is closed only if the remaining burners are in an OFF state as well, otherwise the sole connection valve 25 supplying the burner that cannot be re-ignited is closed.
- the safety assembly 29 is provided with a first safety system and with a second safety system.
- the first safety system comprises the flame sensor 36 and a respective first control device (not shown in detail), which is configured to close the respective connection valve 25 when the flame sensor detects that the flame has extinguished.
- the second safety system comprises the ON/OFF safety valve 32 located along the main duct 22 upstream of said at least one connection valve 25; at least one control element and a second control device 33, which is configured to adjust the position of the safety valve 32 in response to the operating conditions of the control element.
- the second control device 33 is independent of the first control device.
- the second control device 33 operates in an independent manner and in parallel relative to the first control device.
- control device 33 can receive signals from further and/or different control elements and can be configured to close the safety valve 32 based on the conditions of these control elements.
- control device 33 can also be configured to close the safety valve 32 after a given amount of time starting from the opening of the safety valve 32.
- control device 33 can also be configured to close the safety valve 32 based on the temperature value detected by a suitable temperature sensor 37 located so as to detect a temperature value related to the temperature on the inside of the cooking chamber 30.
- a suitable temperature sensor 37 located so as to detect a temperature value related to the temperature on the inside of the cooking chamber 30.
- the temperature sensor 37 can be located on the inside or on the outside of the cooking chamber 30.
- the temperature sensor 37 is the thermocouple of the flame sensor 36.
- the control device 33 closes the safety valve 32.
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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)
- General Preparation And Processing Of Foods (AREA)
- Baking, Grill, Roasting (AREA)
Abstract
Description
- This Patent Application claims priority from Italian Patent Application No.
102019000013521 filed on July 31, 2019 - The invention relates to a gas device for cooking food and to a method for operating a gas cooking device. In particular, the invention relates to gas cooking devices such as stoves, ovens and kitchens.
- Gas food cooking devices are usually provided with one or more safety systems, which are designed to avoid dangerous situations. For example, one of the most common safety system entails interrupting the supply of gas to the burner in which the flame is extinguished, which is generally detected by means of a flame sensor.
- However, in case of fault of traditional safety systems, the risks of an uncontrolled gas outflow or of an unsafe operation of the device are high.
- Documents
WO2009146730A2 andJP2011047611 - Therefore, the object of the invention is to provide a gas food cooking device, which is not affected by the drawbacks of the prior art discussed above; in particular, the object of the invention is to provide a gas food cooking device, which is safer than currently known devices and forbids uncontrolled gas outflows.
- In accordance with these objects, the invention relates to a gas device for cooking food comprising:
- a main gas supply duct, which is configured to be coupled to a domestic gas supply circuit;
- at least one gas burner, which is connected to the main gas supply duct by means of at least one respective connection valve;
- an ignition device, which is configured to selectively generate a spark in the area of said at least one burner;
- a safety assembly comprising:
- a first safety system comprising a flame sensor, which is arranged close to the burner, and a first control device, which is configured to close the respective connection valve when the flame sensor detects that the flame has extinguished;
- a second safety system comprising:
- a safety valve of the ON/OFF type located along the main gas supply duct upstream of said at least one connection valve;
- at least one control element;
- a second control device, which is configured to adjust the position of the safety valve; the second control device being configured to open the safety valve when the ignition device is activated and to close the safety valve in response to the operating conditions of the control element.
- Advantageously, the installation of an automatic general blocking valve blocking the supply of gas and located just downstream of the connection to the domestic line ensures the totally safe operation of the cooking device.
- In case of fault of the first safety system, indeed, the second safety system ensures the complete safety of the cooking device.
- Furthermore, the object of the invention is to provide a method for operating a gas food cooking device, which is safe compared to known methods and forbids uncontrolled gas outflows.
- In accordance with these objects, the invention relates to a method for operating a gas food cooking device as claimed in
claim 10. - Further features and advantages of the invention will be best understood upon perusal of the following description of non-limiting embodiments thereof, with reference to the accompanying drawings, wherein:
-
figure 1 is a schematic representation of a gas cooking device according to the invention; -
figure 2 is a schematic representation of a detail offigure 1 according to a first embodiment; -
figure 3 is a flowchart concerning a step of the method for operating a gas cooking device according to the invention; -
figure 4 is a flowchart concerning a further step of the method for operating a gas cooking device according to the invention; -
figure 5 is a schematic representation of a gas cooking device according to a variant of the invention. - In
figure 1 , reference number 1 indicates a gas food cooking device according to the invention. - In the example shown in
figure 1 , the cooking device is a stove. - The cooking device 1 comprises a main
gas supply duct 2, which is configured to be coupled to a domestic gas supply circuit 3 (which is schematically shown), at least onegas burner 4, which is connected to the maingas supply duct 2 by means of at least oneconnection valve 5, anignition device 7, which is configured to selectively generate aspark 11d in the area of theburner 4, asafety assembly 9 and a casing 6 (which is schematically shown). - In the non-limiting example shown and described herein, the device 1 comprises a plurality of
gas burners 4, each connected to the maingas supply duct 2 by means of arespective connection valve 5. - Each
connection valve 5 is an adjustment valve, which is controlled by arespective actuator 10. In the non-limiting embodiment shown and described herein, theactuator 10 is a knob. - In use, the manual adjustment of the
actuator 10 determines the adjustment of the position of therespective connection valve 5. In this way, the quantity of gas supplied to theburner 4 and, as a consequence, the flame of theburner 4 are adjusted. - The
ignition device 7 is schematically shown infigure 1 by a broken line, whereas it is better visible infigure 2 . - With reference to
figure 2 , theignition device 7 comprises acatenary 8, which comprises a pair ofpower supply cables 11a and a plurality ofcontrol switches 11b, which are connected in parallel betweensaid cables 11a. In particular, the catenary comprises oneswitch 11b for eachactuator 10. - Each
switch 11b is operated by arespective actuator 10. When a pressure is applied to theactuator 10, this normally determines the closing of therespective switch 11b of thecatenary 8. In this way, an electrical connection is established between thepower supply cables 11a so as to activate a knownigniting circuit 11c, which ignites a series ofsparks 11d in the area of therespective burner 4. - When the
actuator 10 is released, therespective switch 11b opens. The switches of thecatenary 8 basically work as normally open switches. - With reference to
figure 1 , thecasing 6 houses at least one portion of the maingas supply duct 2, theconnection valves 5, theignition device 7 and, preferably, also part of thesafety device 9, as discussed more in detail below. On the outside of thecasing 6 there are theburners 4 and theactuators 10. - The
safety assembly 9 comprises asafety valve 12 and acontrol device 13, which is configured to adjust the position of thesafety valve 12. - The
safety valve 12 is an ON/OFF valve located along the maingas supply duct 2 upstream of said at least oneconnection valve 5. In the case discussed herein by way of example, there aredifferent connection valves 5 and thesafety valve 12 is located upstream of allconnection valves 5. - In particular, the
safety valve 12 is located just downstream of the connection to the domesticgas supply circuit 3. Thesafety valve 12 is preferably arranged at a safety distance from theburners 4 or from possible hot areas of the cooking device 1. Thesafety valve 12 is preferably housed outside thecasing 6. - More preferably, the body of the
safety valve 12 is outside thecasing 6, whereas the electric drive of thesafety valve 12 and thecontrol device 13 are preferably housed inside thecasing 6. - The
control device 13 is configured to open thesafety valve 12 when theignition device 7 is activated and to close thesafety valve 12 when given conditions occur. - In particular, the
control device 13 is configured to open thesafety valve 12 when at least oneswitch 11b of thecatenary 8 of theignition device 7 is closed by means of therespective actuator 10. - The
safety valve 12 is a normally closed solenoid valve, which is opened when theignition device 7 is activated. - As a consequence, in the absence of current, the
safety valve 12 is always closed. - Once the
safety valve 12 has been opened, the closing is regulated by thecontrol device 13. - In particular, the
control device 13 is configured to close thesafety valve 12 in response to the operating conditions of at least one control element. - In the non-limiting example described and shown herein, the
control device 13 is configured to close thesafety valve 12 based on the value of at least one operating parameter detected by means of at least onesensor 16. - In the non-limiting example described and shown in
figure 3 , thecontrol device 13 receives signals from a plurality ofsensors 16. - In the non-limiting example described and shown in
figure 3 , thesensor 16 is a flame sensor arranged close to arespective burner 4. In other words, eachburner 4 is associated with asensor 16. Theflame sensor 16 is in an OFF state when it does not detect any flame, whereas it is in an ON state when it detects the presence of a flame. Eachflame sensor 16 preferably comprises a thermocouple. - In the non-limiting example described and shown herein, the
control device 13 is configured so as to close thesafety valve 12 if allsensors 16 do not detect any flame following an attempt of ignition. - In other words, the
safety valve 12 is closed if an attempt of ignition (by means of the activation of the ignition device 7) is not followed by an actual ignition. - With reference to
figure 3 , if allflame sensors 16 remain in the OFF state after theignition device 7 has been activated, the safety valve 12 (which was opened upon activation of the ignition device 7) is immediately closed. - Furthermore, the
control device 13 is preferably configured to activate theignition device 7 when the flame extinguishes during the operation of at least oneburner 4. - In other words, if at least one
sensor flame 16 shifts from an ON state to an OFF state, thecontrol device 13 activates theignition device 7. In particular, thecontrol device 13 is provided with an activation module 17 (shown infigure 1 ), which is configured to activate theignition device 7. - If the flame sensor does not switch again to the ON state within a given amount of time T (defined by a
counter 15 shown infigure 1 ) and if the remainingflame sensors 16 are all in the OFF state, thesafety valve 12 is immediately closed. In case there is at least oneflame sensor 16 in the ON state (cooking currently happening), thesafety valve 12 remains open and theconnection valve 5 supplying theburner 4 is closed so that the latter cannot be ignited again. The closing of theconnection valve 5 is preferably regulated by a further control (not shown), which is directly associated with theflame sensor 16. This logic is schematically shown in the flowchart offigure 4 . - Basically, the
safety assembly 9 is provided with a first safety system and with a second safety system. The first safety system comprises aflame sensor 16 and a respective first control device (not shown), which is configured to close therespective connection valve 5 when the flame sensor detects that the flame has extinguished. - The second safety system comprises the ON/
OFF safety valve 12 located along themain duct 2 upstream of said at least oneconnection valve 5; at least one control element and asecond control device 13, which is configured to adjust the position of thesafety valve 12 in response to the operating conditions of the control element. Thesecond control device 13 is independent of the first control device. Thesecond control device 13 operates in an independent manner and in parallel relative to the first control device. - In this way, even in case of a fault of the first safety system, safety is ensured by the second safety system.
- Basically, if the flame accidentally extinguishes, the
safety device 9 tries to re-ignite it in order to continue the cooking. If this attempt is not successful, theconnection valve 5 and thesafety valve 12 are closed so as to avoid uncontrolled gas outflows. - Obviously, different logics can be implemented in order to obtain the closing of the
safety valve 12, based on thesame sensors 16. Furthermore, thecontrol device 13 can receive signals from further and/or different control elements and can be configured to close thesafety valve 12 based on the conditions of these control elements. - According to a variant, for example, the control device can also be configured to close the
safety valve 12 after a given amount of time starting from the opening of thesafety valve 12. In other words, thecontrol device 13 closes thesafety valve 12 when the counter 15 (whose count is activated simultaneously with the opening of the safety valve 12) reaches a given value. For example, the programmed count can be of at least 4 hours. - In this way, the risk of accidents due to possible oversights of the user (for example, burners that were accidentally left turned on) or faults is significantly reduced.
-
Figure 5 schematically shows adifferent cooking device 20. Thecooking device 20 is a gas oven, which comprises a maingas supply duct 22, which is configured to be coupled to a domestic gas supply circuit 23 (which is schematically shown), at least onegas burner 24, which is connected to the maingas supply duct 22 by means of at least oneconnection valve 25, anignition device 27, which is configured to selectively generate aspark 11d in the area of theburner 24, asafety assembly 29 and a casing 26 (which is schematically shown). - In the non-limiting example described and shown herein, the
device 20 comprises aburner 24, which is arranged so as to heat acooking chamber 30. According to a variant, which is not shown herein, thedevice 20 comprises more than one burner. - The
connection valve 25 is an adjustment valve, which is controlled by anactuator 31. In the non-limiting embodiment shown and described herein, theactuator 31 is a knob. - In use, the manual adjustment of the
actuator 31 determines the adjustment of the position of therespective connection valve 25. In this way, the quantity of gas supplied to theburner 24 and, as a consequence, the flame of theburner 24 are adjusted. - The
ignition device 27 is schematically shown by a broken line and substantially has a structure that is similar to the one of theignition device 7 described with reference to the cooking device 1. - The casing 26 houses at least one portion of the main
gas supply duct 22, theconnection valve 25, theignition device 27 and, preferably, also part of thesafety device 29, as discussed more in detail below. On the outside of thecasing 6 there is theactuator 31. - The
safety assembly 29 comprises asafety valve 32 and acontrol device 33, which is configured to adjust the position of thesafety valve 32. - The
safety valve 32 is an ON/OFF valve located along the maingas supply duct 22 upstream of said at least oneconnection valve 25. - In particular, the
safety valve 32 is located just downstream of the connection to the domesticgas supply circuit 23. Thesafety valve 32 is preferably arranged at a safety distance from theburners 24 or from possible hot areas of the cooking device 20 (such as for example the cooking chamber 30). Thesafety valve 32 is preferably housed outside the casing 26. - More preferably, the body of the
safety valve 32 is outside the casing 26, whereas the electric drive of thesafety valve 32 and thecontrol device 33 are preferably housed inside the casing 26. - The
control device 33 is configured to open thesafety valve 32 when theignition device 27 is activated and to close thesafety valve 32 based on the conditions of at least one control element. - The
safety valve 32 is a normally closed valve, which is opened when theignition device 27 is activated. - As a consequence, in the absence of current, the
safety valve 32 is always closed. - Once the
safety valve 32 has been opened, the closing is regulated by thecontrol device 33. - In the non-limiting example described and shown herein, the
control device 33 is substantially configured similarly to thecontrol device 13 of the cooking device 1. - Therefore, the
control device 33 is configured to close thesafety valve 32 in response to the operating conditions of at least one control element. - In the non-limiting example described and shown herein, the
control device 33 is configured to close thesafety valve 12 based on the value of at least one operating parameter detected by means of at least onesensor 36. - The
sensor 36 preferably is a flame sensor, which is located close to theburner 24. Theflame sensor 36 is in an OFF state when it does not detect any flame, whereas it is in an ON state when it detects the presence of a flame. Eachflame sensor 36 preferably comprises a thermocouple. - In the non-limiting example described and shown herein, the
control device 33 is configured so as to close thesafety valve 32 if thesensor 36 does not detect any flame following an attempt of ignition. - In other words, the
safety valve 32 is closed if an attempt of ignition (by means of the activation of the ignition device 27) is not followed by an actual ignition. - If the
sensor 36 remains in the OFF state after theignition device 27 has been activated, the safety valve 32 (which was opened upon activation of the ignition device 27) is immediately closed. - The closing of the
connection valve 5 is preferably regulated by a further control, which is directly associated with theflame sensor 36. - Furthermore, the
control device 33 is preferably configured to activate theignition device 27 when the flame extinguishes during the operation of theburner 24. - In other words, if the
sensor flame 36 shifts from an ON state to an OFF state, thecontrol device 33 activates theignition device 27. If theflame sensor 36 does not switch to the ON state within a given amount of time T, thesafety valve 32 is immediately closed. - Basically, if the flame accidentally extinguishes, the
safety device 29 tries to re-ignite it in order to continue the cooking. If this attempt is not successful, thesafety valve 32 is closed so as to avoid uncontrolled gas outflows. - In case of an oven provided with different burners (a variant which is not shown herein), the closing logic of the
safety valve 32 is the same as the one adopted for the stove 1. In other words, if there are different burners, thesafety valve 32 is closed only if the remaining burners are in an OFF state as well, otherwise thesole connection valve 25 supplying the burner that cannot be re-ignited is closed. - Basically, the
safety assembly 29 is provided with a first safety system and with a second safety system. The first safety system comprises theflame sensor 36 and a respective first control device (not shown in detail), which is configured to close therespective connection valve 25 when the flame sensor detects that the flame has extinguished. The second safety system comprises the ON/OFF safety valve 32 located along themain duct 22 upstream of said at least oneconnection valve 25; at least one control element and asecond control device 33, which is configured to adjust the position of thesafety valve 32 in response to the operating conditions of the control element. Thesecond control device 33 is independent of the first control device. Thesecond control device 33 operates in an independent manner and in parallel relative to the first control device. - In this way, even in case of a fault of the first safety system, safety is ensured by the second safety system.
- Obviously, different logics can be implemented in order to obtain the closing of the
safety valve 32, based on thesensor 36. Furthermore, thecontrol device 33 can receive signals from further and/or different control elements and can be configured to close thesafety valve 32 based on the conditions of these control elements. - According to a variant, for example, the
control device 33 can also be configured to close thesafety valve 32 after a given amount of time starting from the opening of thesafety valve 32. - According to a further variant, for example, the
control device 33 can also be configured to close thesafety valve 32 based on the temperature value detected by asuitable temperature sensor 37 located so as to detect a temperature value related to the temperature on the inside of thecooking chamber 30. In other words, thetemperature sensor 37 can be located on the inside or on the outside of thecooking chamber 30. - In the non-limiting embodiment described and shown herein, the
temperature sensor 37 is the thermocouple of theflame sensor 36. - If the
temperature sensor 37 detects a temperature value exceeding a given threshold value, thecontrol device 33 closes thesafety valve 32. - Finally, it is clear that the cooking device and the method described herein can be subjected to changes and variations, without for this reason going beyond the scope of protection set forth in the appended claims.
Claims (16)
- Gas device for cooking food comprising:• a main gas supply duct (2; 22) configured to be coupled to a domestic gas supply circuit (3; 23);• at least one gas burner (4; 24) connected to the main gas supply duct (2; 22) by at least one respective connection valve (5; 25);• an ignition device (7; 27) configured to selectively generate a spark (11d) at the at least one burner (4; 24) ;• a safety assembly (9; 29) comprising:• a first safety system comprising a flame sensor (16; 36), which is arranged close to the burner (4; 24), and a first control device, which is configured to close the respective connection valve (5; 25) when the flame sensor (16; 36) detects that the flame has extinguished;• a second safety system comprising:- a safety valve (12; 32) of the ON/OFF type located along the main gas supply duct (2; 22) upstream of the at least one connection valve (5; 25);- at least one control element (15; 16; 36, 37);- a second control device (13; 33) configured to regulate the position of the safety valve (12; 32); the second control device (13; 33) being configured to open the safety valve (12; 32) when the ignition device (7; 27) is activated and to close the safety valve (12; 32) in response to the operating conditions of the control element (15; 16; 36, 37).
- Device according to claim 1, comprising a casing (6; 36), which houses at least one portion of the main gas supply duct (2; 22), said at least one connection valve (5; 25) and the ignition device (7; 27); the safety valve (12; 32) being housed outside the casing (6; 36).
- Device according to claim 1, wherein the safety valve (12; 32) is a normally closed solenoid valve.
- Device according to any of the previous claims, wherein the control element is a counter (15) configured to start a count when the safety valve is opened (12; 32) and the second control device (13; 33) is configured to close the safety valve (12; 32) when the count of the counter (15) reaches a programmed value.
- Device according to any of the previous claims, wherein the control element (16; 36, 37) is a sensor and the second control device (13; 33) is configured to close the safety valve (12; 32) on the basis of the data collected by the sensor (16; 36, 37).
- Device according to claim 5, wherein the sensor (16; 36) is a flame sensor located near the burner (4; 24); the second control device (13; 33) being configured to close the safety valve (12; 32) when the flame sensor (16; 36) does not detect any flame in the burner (4; 24).
- Device according to claim 6, comprising a plurality of burners (4) and a plurality of flame sensors (16), each of which is located near a respective burner (4); the second control device (13, 33) being configured to close the safety valve (12, 32) when all the flame sensors (16) do not detect any flame in their respective burners (4) .
- Device according to claim 6 or 7, wherein the second control device (13; 33) comprises an activation module (17) configured to activate the ignition device (7; 27) when at least one flame sensor (16; 36) detects a switching-off of the ignited flame of the respective burner (4; 24).
- Device according to anyone of the claims from 5 to 8, comprising a cooking chamber (30) heated by at least one burner (24); the sensor (37) being a temperature sensor arranged to detect a temperature value related to the temperature in the cooking chamber (30); the second control device (32) being configured to close the safety valve (32) when the temperature detected by the temperature sensor (37) exceeds a certain threshold value.
- Method to operate a gas device for cooking food; the device comprising:• a main gas supply duct (2; 22) configured to be coupled to a domestic gas supply circuit (3; 23);• at least one gas burner (4; 24) connected to the main gas supply duct (2; 22) by at least one respective connection valve (5; 25);• an ignition device (7; 27) configured to selectively generate a spark (11d) at the at least one burner (4; 24) ;• a safety assembly (9; 29) comprising:• a first safety system comprising a flame sensor (16; 36), which is arranged close to the burner (4; 24);• a second safety system comprising:
a safety valve (12; 32) of the ON/OFF type located along the main gas supply duct (2; 22) upstream of the at least one connection valve (5; 25); and a control element (15; 16; 36, 37);
the method comprising:closing the respective connection valve (5; 25) when the flame sensor (16; 36) detects that the flame has extinguished;opening the safety valve (12; 32) when the ignition device (7; 27) is activated; andclosing the safety valve (12; 32) in response to the operating conditions of the control element (15; 16; 36, 37) . - Method according to claim 10, wherein the control element is a counter (15) configured to start a count when the safety valve (12; 32) is opened; the method comprises closing the safety valve (12; 32) when the count of the counter (15) reaches a programmed value.
- Method according to claim 10 or 11, wherein the control element (16; 36, 37) comprises at least one sensor; the method comprising closing the safety valve (12; 32) on the basis of the data collected by the sensor (16; 36, 37).
- Method according to claim 12, wherein the sensor (16; 36) is the flame sensor located near the burner (4; 24); the method comprising closing the safety valve (12; 32) when the flame sensor (16; 36) does not detect any flame in the burner (4; 24).
- Method according to claim 12, wherein the cooking device comprises a plurality of burners (4) and the control element (16) comprises a plurality of flame sensors (16), each of which is located near a respective burner (4); the method comprising closing the safety valve (12) when all the flame sensors (16) do not detect any flame in their respective burners (4).
- Method according to claim 13 or 14, comprising activating the ignition device (7; 27) when at least one flame sensor (16; 36) detects a switching-off of the ignited flame of the respective burner (4; 24).
- Method according to any of the claims 12 to 15, comprising a cooking chamber (30) heated by at least one burner (24); the sensor (37) being a temperature sensor arranged so as to detect a temperature value related to the temperature in the cooking chamber (30); the method comprising closing the safety valve (32) when the temperature detected by the temperature sensor (37) exceeds a certain threshold value.
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
IT102019000013521A IT201900013521A1 (en) | 2019-07-31 | 2019-07-31 | DEVICE FOR COOKING FOOD WITH GAS AND METHOD FOR OPERATING THIS DEVICE |
Publications (1)
Publication Number | Publication Date |
---|---|
EP3771865A1 true EP3771865A1 (en) | 2021-02-03 |
Family
ID=68988133
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP20188841.9A Pending EP3771865A1 (en) | 2019-07-31 | 2020-07-31 | Gas device for cooking food and method for operating said device |
Country Status (3)
Country | Link |
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EP (1) | EP3771865A1 (en) |
CN (1) | CN213746839U (en) |
IT (1) | IT201900013521A1 (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2023177365A1 (en) * | 2022-03-15 | 2023-09-21 | Femas Metal San. Ve Tic. A.S. | A dual burner gas oven |
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JPS60235918A (en) * | 1984-05-08 | 1985-11-22 | Matsushita Electric Ind Co Ltd | Gas table heater with timer |
EP0790467A1 (en) * | 1996-02-15 | 1997-08-20 | Eaton S.A.M. | Safety means for use with a gas heating or gas cooking appliance |
WO2007064893A2 (en) * | 2005-12-02 | 2007-06-07 | Robertshaw Controls Company | Gas cook-top with glass (capacitive) touch controls and automatic burner re-ignition |
WO2009146730A2 (en) | 2008-05-02 | 2009-12-10 | Coprecitec, S.L. | Gas distribution unit for a cooking appliance |
JP2011047611A (en) | 2009-08-28 | 2011-03-10 | Harman Pro:Kk | Heating cooker |
JP2015014415A (en) * | 2013-07-04 | 2015-01-22 | リンナイ株式会社 | Stove burner |
JP2015219002A (en) * | 2014-05-21 | 2015-12-07 | リンナイ株式会社 | Gas cooker |
JP2019066119A (en) * | 2017-10-03 | 2019-04-25 | リンナイ株式会社 | Heating cooker |
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US3563457A (en) * | 1970-03-13 | 1971-02-16 | Harper Wyman Co | Oven control with shutoff for standing pilot |
-
2019
- 2019-07-31 IT IT102019000013521A patent/IT201900013521A1/en unknown
-
2020
- 2020-07-31 CN CN202021573198.XU patent/CN213746839U/en active Active
- 2020-07-31 EP EP20188841.9A patent/EP3771865A1/en active Pending
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JPS60235918A (en) * | 1984-05-08 | 1985-11-22 | Matsushita Electric Ind Co Ltd | Gas table heater with timer |
EP0790467A1 (en) * | 1996-02-15 | 1997-08-20 | Eaton S.A.M. | Safety means for use with a gas heating or gas cooking appliance |
WO2007064893A2 (en) * | 2005-12-02 | 2007-06-07 | Robertshaw Controls Company | Gas cook-top with glass (capacitive) touch controls and automatic burner re-ignition |
WO2009146730A2 (en) | 2008-05-02 | 2009-12-10 | Coprecitec, S.L. | Gas distribution unit for a cooking appliance |
JP2011047611A (en) | 2009-08-28 | 2011-03-10 | Harman Pro:Kk | Heating cooker |
JP2015014415A (en) * | 2013-07-04 | 2015-01-22 | リンナイ株式会社 | Stove burner |
JP2015219002A (en) * | 2014-05-21 | 2015-12-07 | リンナイ株式会社 | Gas cooker |
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WO2023177365A1 (en) * | 2022-03-15 | 2023-09-21 | Femas Metal San. Ve Tic. A.S. | A dual burner gas oven |
Also Published As
Publication number | Publication date |
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IT201900013521A1 (en) | 2021-01-31 |
CN213746839U (en) | 2021-07-20 |
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