EP2739908A2 - Thermocouple arrangement on a cooking range and associated thermocouple - Google Patents

Thermocouple arrangement on a cooking range and associated thermocouple

Info

Publication number
EP2739908A2
EP2739908A2 EP12769722.5A EP12769722A EP2739908A2 EP 2739908 A2 EP2739908 A2 EP 2739908A2 EP 12769722 A EP12769722 A EP 12769722A EP 2739908 A2 EP2739908 A2 EP 2739908A2
Authority
EP
European Patent Office
Prior art keywords
connecting element
thermocouple
ground wire
burner
gas tube
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Withdrawn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
EP12769722.5A
Other languages
German (de)
French (fr)
Inventor
Daniele Pianezze
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.)
Illinois Tool Works Inc
Original Assignee
Illinois Tool Works Inc
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 Illinois Tool Works Inc filed Critical Illinois Tool Works Inc
Publication of EP2739908A2 publication Critical patent/EP2739908A2/en
Withdrawn legal-status Critical Current

Links

Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N5/00—Systems for controlling combustion
    • F23N5/24—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
    • 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
    • F23N5/107—Systems for controlling combustion using devices responsive to thermal changes or to thermal expansion of a medium using thermocouples using mechanical means, e.g. safety valves
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23D—BURNERS
    • F23D2208/00—Control devices associated with burners
    • F23D2208/10—Sensing devices
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2900/00—Special features of, or arrangements for controlling combustion
    • F23N2900/05004—Details of components, e.g. connecting adaptors
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
    • F23N—REGULATING OR CONTROLLING COMBUSTION
    • F23N2900/00—Special features of, or arrangements for controlling combustion
    • F23N2900/05101—Connections between thermocouple and magnetic valves, e.g. by plug and socket connectors

Definitions

  • the present invention relates to a thermocouple arrangement on a cooking range for a household appliance as well as to the thermocouple associated with such arrangement .
  • thermocouple intended for controlling the safety solenoid valve of the gas tap coupled with the burner.
  • thermocouples normally used for such reason have an electrically conducting body fixed to the burner plate and carrying at a first end the so-called "hot junction" of the thermocouple, consisting of a tip made .of a first metal alloy and intended to remain in use immersed in the flame generated by the burner, and of a conducting element made of a -second metal alloy, welded to the tip at an end thereof and for the rest electrically insulated therefrom; a polarity wire is connected to such second conducting element while a ground wire is connected to the body, which is mechanically and electrically connected to the tip.
  • An electro-motive force is thus generated at the terminals of the two wires that keeps an electromagnet of the gas tap energized, allowing the gas supply to continue. If the flame goes off, the electro-motive force stops and the electromagnet interrupts the gas supply.
  • thermocouples of the above type the two wires are electrically connected with the opposite terminals of the electromagnet by means of a coaxial connector, which however is expensive.
  • thermocouples provided with a ground wire which is fixed outside the gas tap body as in CH355119, which however causes the problem of how to fix such wire in a removable but safe manner, or thermocouples without the ground wire, thus provided only with a polarity wire; in this case, the electrical circuit supplying the electromagnet closes through the various elements of the cooking range which are in a sequence interposed between the thermocouple body and the gas tap body that contains the electromagnet. If, on one hand, this latter solution is certainly less expensive, however it implies a response time, i.e.
  • thermocouple arrangement on a cooking range which allows relatively fast response times associated with a relatively low cost of the thermocouple and with an easy and quick assembly of the same on the cooking range. It is a further object of the invention to provide a thermocouple to be used in such arrangement .
  • the present invention therefore relates to a thermocouple arrangement on a cooking range of a household appliance as defined in claim 1, as well as to a thermocouple for a burner of a cooking range according to claim 7.
  • thermocouple arrangement comprises a thermocouple comprising in turn an electrically conducting body carrying a hot junction at a first end and provided at a second end opposite to the first end with a polarity wire and with a ground wire electrically connected to the body; a burner of the cooking , range provided with a plate to which the thermocouple is integrally secured so that, in use, the hot junction is immersed into the flame generated by the burner; an electrically conducting, metal gas tube which connects the burner to a gas regulating tap; and a safety electromagnet adapted to interrupt the gas feeding to the gas tube if it is not fed by a potential difference generated by the thermocouple .
  • the ground wire ends with a connecting element which is connected so as to snap-crimp onto the metal gas tube.
  • the ground wire is shorter .than the polarity wire and the connecting element consists of a metal foil folded to form a fork spring shaped as a cylindrical sleeve open on one side, which is welded to the ground wire and is mounted so as to snap-crimp onto the metal gas tube close to the burner.
  • “snap-crimped” denotes a mechanical connection that not only implies the snap coupling between two elements but also the mechanical biting with consequent close mechanical anchoring of one element onto the other.
  • the connecting element is connected so as to snap-crimp onto a segment of the metal gas tube comprised between the regulating tap and the burner and thus arranged downstream of the gas tap with respect to a gas flow flowing through the gas tube.
  • thermocouple which, by contrast to the known ones, while comprising two wires, has the ground wire significantly shorter and above all provided with a wholly original connecting element to a selected element of the cooking range, defined by the gas supply tube of the burner provided with the thermocouple.
  • thermocouple A great saving is thus obtained due to both the absence of axial connectors and to the fact that the shorter ground wire allows the final cost of the thermocouple to be reduced by about 50%.
  • assembly of the thermocouple is made easier and quicker, since it is not necessary to ensure a perfect adhesion between the thermocouple body and the burner plate, as it happens in the thermocouples with one wire only, and because the fixing to the ground is obtained with a simple snap-mounting of the connecting element.
  • thermocouples with one wire only very short response times are obtained, in particular as compared to the thermocouples with one wire only, since the total -electrical resistor of the thermocouple/gas tube/gas tap/electromagnet sequence is less than the half (about 28 mOhm) of that occurring with thermocouples with one wire only.
  • figure 1 shows a perspective view of a thermocouple made according to the invention
  • figure 2 shows a perspective three-fourth top view with truncated parts for simplicity of a cooking range having a thermocouple arrangement according to the invention
  • FIGS 3, 4 and 5 show an enlarged scale view of a component of the thermocouple of figure 1 in perspective, longitudinal section and front orthogonal view, respectively.
  • reference numeral 1 indicates a thermocouple intended to equip a fire or burner 2 of a cooking range 3 of a household appliance.
  • Thermocouple 1 comprises an electrically conducting body 4, for example made of brass, fixable in use to fire or burner 2 and a hot junction 5 including a tip 6 made of a first conducting metal alloy, typically an NiCr9010 alloy (90% by weight nickel and 10% by weight chromium) wherein a conducting element (known and not shown) is arranged, made of a second metal alloy, typically constantan (55-60% by weight copper and 40-45% by weight nickel alloy) ;
  • the hot junction 5 is integrally carried by a first end 7 of body 4 from which tip 6 axially projects in a cantilevered fashion; at a second end 9 of body 4, opposite to end 7, body 4 is provided with a polarity wire 10 and with a ground wire 11 electrically connected to body 4 , at the terminals of which an electro-motive force is generated in use when the hot junction 5 is exposed to
  • thermocouple arrangement for the cooking range 3 comprises (figure 2) thermocouple 1, burner 2, which is provided with a plate 12 to which thermocouple 1 is integrally secured so that, in use, the hot junction 5 is immersed into the flame generated by burner 2; and an electrically conducting metal gas tube 13 (typically made of aluminium) belonging to the cooking range 3 and which connects burner 2 with a gas regulating tap 1 , of the known type and therefore only schematically indicated for simplicity with a dashed block.
  • thermocouple arrangement 8 finally comprises a safety electromagnet 15, also known and for simplicity only schematically shown as a dashed block, integrated or not with tap 14, adapted to interrupt the gas supply towards tube 13 if it is not fed by a potential difference generated by thermocouple 1.
  • thermocouple 1 is fixed to plate 12 close to a known switching on electrode / spark plug 16 of the cooking range 3.
  • the ground wire 11 ends with a connecting element 18 which, in arrangement 8 of the invention, is connected so as to snap-crimp directly onto the metal gas tube 13, on a segment of the metal gas tube 13 comprised between the regulating tap 14 and burner 2, and thus arranged downstream of the gas tap 13 with respect to a gas flow flowing in use through tube 13.
  • the ground wire 11 is made shorter than the polarity wire 10 and the connecting element .18 is crimped onto the gas tube 13 close to burner 2, as close as possible to the same compatibly with the length of wire 11 and with the overall dimensions on the cooking range 3.
  • the connecting element 18 of the ground wire 11 consists of a metal foil 20 cut and folded to form a fork spring 21 shaped as a cylindrical sleeve open on one side, which is welded to the ground wire 11 by means of welding spots 22 at an outer cylindrical side surface 23 and in use is mounted so as to snap-crimp onto the metal gas tube 13, straddling the same.
  • the connecting element 18 is further provided with a series of teeth 24 and/or ridges 25 (figure 5) which, when the connecting element 18 is snap-crimped onto the gas tube 13, bite into an outer side surface 26 (figure 2) of the gas tube 13 to improve both the mechanical coupling and the electric connection between gas tube 13 and ground wire 11, eventually even in the presence of oxidations of tube 13.
  • the polarity cable 10 is provided with a Faston connector 27 (figure 1) with which wire 10 ends and by which wire 10 is electrically connected with a pole of electromagnet 15.
  • Thermocouple 1 made according to the invention therefore looks as a standard thermocouple whose body 4 carries the hot junction, 3 the tip 6 of which is designed for remaining, in use, immersed into the flame generated by burner 2 and wherein body 3 carries the polarity wire 10 and the ground wire 11 on the side opposite to tip 6.
  • the ground wire 11, which is directly connected to the conducting body 4 is shorter than the polarity wire 10 and ends with a connecting element 18 shaped so as to be adapted, in use, to be connected so as to snap-crimp onto a metal gas tube 13 of the cooking range 3 straddling the same, in particular on the same tube 13 that serves burner 2 equipped with thermocouple 1.
  • teeth 24 are each obtained on a free end of a respective elastically deformable arm 40 of the connecting element 18, radially inside the connecting element 18 which, as already said, has a substantially cylindrical symmetry.
  • Foil 20 forming the connecting element 18 is in fact bent to form spring 21, which .. is shaped as a cylindrical sleeve wherein a circumferential section thereof equal to at least one third of its perimeter is missing; a first end 41 of the connecting element, facing the side opposite to body 4, has its whole perimeter defined by a plurality of arms 40 provided with teeth 24 and by two further arms 40b, arranged at the opposite circumferential ends of end 41, deprived of teeth 24. Arms 40, 40b are spaced apart by slits 42 made through the side surface 23; end 41 is that distal from the ground wire 11.
  • a second end 43 of the connecting element 18, opposite to end 42 and thus proximal to the ground wire 11, on which the ground wire 11 is welded, is delimited by a continuous side wall defined by surface 23 and on such wall it is provided with at least one pair of diametrically opposite side bosses 45 which radially form, on the inside the connecting element 18, the respective ridges 25 adapted in use to bite into surface 26 of the gas tube 13.
  • the connecting element 18 has four arms 40 having the same circumferential width and equally spaced apart through slits 42, which cover a circumferential extension of 180°; it further has two arms 40b deprived of teeth 24 and arranged at the circumferential ends of end 41, which have the same circumf rential width as that of arms 40 and which extend below the diametrical plane of the sleeve defined by spring 21.

Landscapes

  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Control Of Combustion (AREA)
  • Gas Burners (AREA)
  • Cookers (AREA)

Abstract

An arrangement (8) wherein a thermocouple (1) including an electrically conducting body (4) carrying a hot junction (5) at an end (7) and at the opposite end provided with a polarity wire (10) and with a ground wire (11) electrically connected to the body (4), is integrally carried by a plate (12) of a burner (2) of a cooking range so that, in use, the hot junction (5) is immersed into the flame generated by the burner; and wherein the cooking range (.3) includes at least one electrically conducting, metal gas tube (13) which connects the burner (2) to a gas regulating tap (14) provided with a safety electromagnet (15); the ground wire (11) is shorter than the polarity wire (10) and ends with a connecting element (18) consisting of a metal foil (20) bent to form a fork spring (21) shaped as a cylindrical sleeve open on one side, which is snap-crimped onto the metal gas tube (13) close to the burner (2).

Description

THERMOCOUPLE ARRANGEMENT ON A COOKING RANGE AND ASSOCIATED THERMOCOUPLE
TECHNICAL FIELD
The present invention relates to a thermocouple arrangement on a cooking range for a household appliance as well as to the thermocouple associated with such arrangement .
BACKGROUND ART
It is known that in modern cooking ranges , for safety reasons, each burner of the cooking range is provided, usually next to the switching on electrode, with a thermocouple intended for controlling the safety solenoid valve of the gas tap coupled with the burner.
The thermocouples normally used for such reason have an electrically conducting body fixed to the burner plate and carrying at a first end the so-called "hot junction" of the thermocouple, consisting of a tip made .of a first metal alloy and intended to remain in use immersed in the flame generated by the burner, and of a conducting element made of a -second metal alloy, welded to the tip at an end thereof and for the rest electrically insulated therefrom; a polarity wire is connected to such second conducting element while a ground wire is connected to the body, which is mechanically and electrically connected to the tip. An electro-motive force is thus generated at the terminals of the two wires that keeps an electromagnet of the gas tap energized, allowing the gas supply to continue. If the flame goes off, the electro-motive force stops and the electromagnet interrupts the gas supply.
In the thermocouples of the above type, the two wires are electrically connected with the opposite terminals of the electromagnet by means of a coaxial connector, which however is expensive. As an alternative, it is possible to use thermocouples provided with a ground wire which is fixed outside the gas tap body, as in CH355119, which however causes the problem of how to fix such wire in a removable but safe manner, or thermocouples without the ground wire, thus provided only with a polarity wire; in this case, the electrical circuit supplying the electromagnet closes through the various elements of the cooking range which are in a sequence interposed between the thermocouple body and the gas tap body that contains the electromagnet. If, on one hand, this latter solution is certainly less expensive, however it implies a response time, i.e. the time elapsing from the onset of the flame to the time in which the electro-motive force generated is able of keeping the electromagnet energized. This is annoying for the user who, until the electro-motive force generated by the thermocouple is not sufficient to keep the gas tap open, must continue to , press on the switching on button.
DISCLOSURE OF INVENTION
It is an object of the present invention to overcome such disadvantages by providing a thermocouple arrangement on a cooking range which allows relatively fast response times associated with a relatively low cost of the thermocouple and with an easy and quick assembly of the same on the cooking range. It is a further object of the invention to provide a thermocouple to be used in such arrangement .
The present invention therefore relates to a thermocouple arrangement on a cooking range of a household appliance as defined in claim 1, as well as to a thermocouple for a burner of a cooking range according to claim 7.
The thermocouple arrangement according to the invention comprises a thermocouple comprising in turn an electrically conducting body carrying a hot junction at a first end and provided at a second end opposite to the first end with a polarity wire and with a ground wire electrically connected to the body; a burner of the cooking , range provided with a plate to which the thermocouple is integrally secured so that, in use, the hot junction is immersed into the flame generated by the burner; an electrically conducting, metal gas tube which connects the burner to a gas regulating tap; and a safety electromagnet adapted to interrupt the gas feeding to the gas tube if it is not fed by a potential difference generated by the thermocouple .
According to the main aspect of the invention, the ground wire ends with a connecting element which is connected so as to snap-crimp onto the metal gas tube. In particular, the ground wire is shorter .than the polarity wire and the connecting element consists of a metal foil folded to form a fork spring shaped as a cylindrical sleeve open on one side, which is welded to the ground wire and is mounted so as to snap-crimp onto the metal gas tube close to the burner.
Here and hereinafter, "snap-crimped" denotes a mechanical connection that not only implies the snap coupling between two elements but also the mechanical biting with consequent close mechanical anchoring of one element onto the other. Moreover, according to the invention, the connecting element is connected so as to snap-crimp onto a segment of the metal gas tube comprised between the regulating tap and the burner and thus arranged downstream of the gas tap with respect to a gas flow flowing through the gas tube.
A thermocouple is thus obtained which, by contrast to the known ones, while comprising two wires, has the ground wire significantly shorter and above all provided with a wholly original connecting element to a selected element of the cooking range, defined by the gas supply tube of the burner provided with the thermocouple.
A great saving is thus obtained due to both the absence of axial connectors and to the fact that the shorter ground wire allows the final cost of the thermocouple to be reduced by about 50%. At the same time, the assembly of the thermocouple is made easier and quicker, since it is not necessary to ensure a perfect adhesion between the thermocouple body and the burner plate, as it happens in the thermocouples with one wire only, and because the fixing to the ground is obtained with a simple snap-mounting of the connecting element. Finally, very short response times are obtained, in particular as compared to the thermocouples with one wire only, since the total -electrical resistor of the thermocouple/gas tube/gas tap/electromagnet sequence is less than the half (about 28 mOhm) of that occurring with thermocouples with one wire only.
BRIEF DESCRIPTION OF THE DRAWINGS
Further features and advantages of the present invention will appear clearly from the following description of a preferred embodiment thereof, made by way of a non- limiting example and with reference to the attached drawings, wherein:
figure 1 shows a perspective view of a thermocouple made according to the invention;
figure 2 shows a perspective three-fourth top view with truncated parts for simplicity of a cooking range having a thermocouple arrangement according to the invention; and
figures 3, 4 and 5 show an enlarged scale view of a component of the thermocouple of figure 1 in perspective, longitudinal section and front orthogonal view, respectively.
BEST MODE FOR CARRYING OUT THE INVENTION
With reference to figures 1 to 3 , reference numeral 1 indicates a thermocouple intended to equip a fire or burner 2 of a cooking range 3 of a household appliance. Thermocouple 1 comprises an electrically conducting body 4, for example made of brass, fixable in use to fire or burner 2 and a hot junction 5 including a tip 6 made of a first conducting metal alloy, typically an NiCr9010 alloy (90% by weight nickel and 10% by weight chromium) wherein a conducting element (known and not shown) is arranged, made of a second metal alloy, typically constantan (55-60% by weight copper and 40-45% by weight nickel alloy) ; the hot junction 5 is integrally carried by a first end 7 of body 4 from which tip 6 axially projects in a cantilevered fashion; at a second end 9 of body 4, opposite to end 7, body 4 is provided with a polarity wire 10 and with a ground wire 11 electrically connected to body 4 , at the terminals of which an electro-motive force is generated in use when the hot junction 5 is exposed to a temperature considerably higher than that of body 4.
The thermocouple arrangement for the cooking range 3 according to the invention, globally indicated with reference numeral 8, comprises (figure 2) thermocouple 1, burner 2, which is provided with a plate 12 to which thermocouple 1 is integrally secured so that, in use, the hot junction 5 is immersed into the flame generated by burner 2; and an electrically conducting metal gas tube 13 (typically made of aluminium) belonging to the cooking range 3 and which connects burner 2 with a gas regulating tap 1 , of the known type and therefore only schematically indicated for simplicity with a dashed block. The thermocouple arrangement 8 finally comprises a safety electromagnet 15, also known and for simplicity only schematically shown as a dashed block, integrated or not with tap 14, adapted to interrupt the gas supply towards tube 13 if it is not fed by a potential difference generated by thermocouple 1. Typically, thermocouple 1 is fixed to plate 12 close to a known switching on electrode / spark plug 16 of the cooking range 3.
According to the main feature of the invention, the ground wire 11 ends with a connecting element 18 which, in arrangement 8 of the invention, is connected so as to snap-crimp directly onto the metal gas tube 13, on a segment of the metal gas tube 13 comprised between the regulating tap 14 and burner 2, and thus arranged downstream of the gas tap 13 with respect to a gas flow flowing in use through tube 13. In particular, the ground wire 11 is made shorter than the polarity wire 10 and the connecting element .18 is crimped onto the gas tube 13 close to burner 2, as close as possible to the same compatibly with the length of wire 11 and with the overall dimensions on the cooking range 3.
With reference now also to figures 4 and 5, the connecting element 18 of the ground wire 11 consists of a metal foil 20 cut and folded to form a fork spring 21 shaped as a cylindrical sleeve open on one side, which is welded to the ground wire 11 by means of welding spots 22 at an outer cylindrical side surface 23 and in use is mounted so as to snap-crimp onto the metal gas tube 13, straddling the same.
The connecting element 18 is further provided with a series of teeth 24 and/or ridges 25 (figure 5) which, when the connecting element 18 is snap-crimped onto the gas tube 13, bite into an outer side surface 26 (figure 2) of the gas tube 13 to improve both the mechanical coupling and the electric connection between gas tube 13 and ground wire 11, eventually even in the presence of oxidations of tube 13.
Finally, according to arrangement 8, towards the gas tap 14, the polarity cable 10 is provided with a Faston connector 27 (figure 1) with which wire 10 ends and by which wire 10 is electrically connected with a pole of electromagnet 15.
Thermocouple 1 made according to the invention therefore looks as a standard thermocouple whose body 4 carries the hot junction, 3 the tip 6 of which is designed for remaining, in use, immersed into the flame generated by burner 2 and wherein body 3 carries the polarity wire 10 and the ground wire 11 on the side opposite to tip 6. However, unlike the thermocouples of the prior art, the ground wire 11, which is directly connected to the conducting body 4, is shorter than the polarity wire 10 and ends with a connecting element 18 shaped so as to be adapted, in use, to be connected so as to snap-crimp onto a metal gas tube 13 of the cooking range 3 straddling the same, in particular on the same tube 13 that serves burner 2 equipped with thermocouple 1.
With reference to figures 3-5, teeth 24 are each obtained on a free end of a respective elastically deformable arm 40 of the connecting element 18, radially inside the connecting element 18 which, as already said, has a substantially cylindrical symmetry.
Foil 20 forming the connecting element 18 is in fact bent to form spring 21, which .. is shaped as a cylindrical sleeve wherein a circumferential section thereof equal to at least one third of its perimeter is missing; a first end 41 of the connecting element, facing the side opposite to body 4, has its whole perimeter defined by a plurality of arms 40 provided with teeth 24 and by two further arms 40b, arranged at the opposite circumferential ends of end 41, deprived of teeth 24. Arms 40, 40b are spaced apart by slits 42 made through the side surface 23; end 41 is that distal from the ground wire 11.
On the other hand, a second end 43 of the connecting element 18, opposite to end 42 and thus proximal to the ground wire 11, on which the ground wire 11 is welded, is delimited by a continuous side wall defined by surface 23 and on such wall it is provided with at least one pair of diametrically opposite side bosses 45 which radially form, on the inside the connecting element 18, the respective ridges 25 adapted in use to bite into surface 26 of the gas tube 13.
In the exemplary embodiment shown, the connecting element 18 has four arms 40 having the same circumferential width and equally spaced apart through slits 42, which cover a circumferential extension of 180°; it further has two arms 40b deprived of teeth 24 and arranged at the circumferential ends of end 41, which have the same circumf rential width as that of arms 40 and which extend below the diametrical plane of the sleeve defined by spring 21.

Claims

1. A thermocouple arrangement (8) on a cooking range :omprising a thermocouple (1),. comprising in turn an slectrically conducting body (4) carrying a hot junction (5) at a first end (7) and provided with a polarity wire
(10) at a second end (9) opposite to the first end, and vith a ground wire (11) electrically connected to the body (4); a burner (2) of the cooking range (3) provided with a plate (12) to which the thermocouple (1) is integrally secured so that, in use, the hot junction (5) is immersed into the flame generated by the burner; an electrically conducting, metal gas tube (13) which connects the burner bo a gas regulating tap (14); and a safety electromagnet (15) adapted to interrupt the gas feeding to said tube (13) if it is not fed by a potential difference . generated by the thermocouple (1) ; characterized in that the ground wire
(11) ends with a connecting element (18) which is connected so as to snap-crimp onto a segment of the metal gas tube (13) comprised between the regulating tap (14) and the burner (2) and thus arranged downstream of the gas tap (13) with respect to a gas flow flowing through said tube (13) .
2. An arrangement according to claim 1, characterized in that the ground wire (11) is shorter than the polarity wire (10) .
3. An arrangement according to claim 1 or 2, haracterized in that the connecting element (18) of the round wire (11) consists of a metal foil (20) folded to orm a fork spring (21) shaped as a cylindrical sleeve open in one side, which is welded to the ground wire (11) and is lounted so as to snap-crimp onto the metal gas tube (13) , traddling the same.
4. An arrangement according to one of the preceding ilaims, characterized in that the connecting element (18) s crimped onto the gas tube (13) close to the burner (2) .
5. An arrangement according to one of the preceding :laims, characterized in that the connecting element (18) s provided with a series of teeth (24) and/or ridges (25) tfiich, when the connecting element is connected so as to map-crimp onto the gas tube, bite into an outer side lurface (26) of the gas tube to improve both the mechanical loupling and the electric connection between gas tube (13) md ground wire (11) .
6. An arrangement according to one of the preceding ilaims, characterized in that, towards the gas tap (14) , .he polarity wire (10) is provided with a Faston connector 27) .
7. A thermocouple (1) of the type comprising an ilectrically conducting body (4) fixable in. use to a plate (12) of a burner (2) of a cooking range (3) ; a hot junction (5) carried by the 'body (4) at a first end (7) thereof and comprising, in turn, a tip (6) designed to remain immersed Into the flame generated by the burner (2) in use; a polarity wire (10) and a ground wire (11) carried by the Dody (4) at a second end (9) thereof, opposite to the Eirst, the ground wire (11) being directly connected to the conducting body (4) ; characterized in that the ground wire (11) is shorter that the polarity wire (10) and ends with a connecting element (18) shaped so that it is adapted to be connected in use so as to snap-crimp onto a metal gas tube
(13) of the cooking range.
8. A thermocouple according to claim 7, characterized in that the connecting element (18) of the ground wire (11) consists of a metal foil (20) folded to form a fork spring (21) shaped as a cylindrical sleeve open on one side, which is welded to the ground wire (11) and is adapted to be mounted in use so as to snap-crimp onto said Ttetal gas tube (13) of the cooking range straddling the same .
9. A thermocouple according to claim 7 or 8, characterized in that the connecting element (18) is provided with a series of teeth (24) and/or ridges (25) which, when the connecting element (18) is snap-crimped Dnto said gas tube (13) of the cooking range, are adapted to bite into an outer side surface (26) of the gas tube.
10. A thermocouple , according to claim 9, characterized in that said teeth (24) are each obtained on a free end of a respective elastically deformable arm (40) of the connecting element, radially inside the connecting element; the latter being provided with a plurality of said arms (40) , which along with a pair of circumferentially terminal arms (40b) deprived of teeth (24) , define the whole periphery perimeter of a first end (41) of the connecting element (18) , which is distal from the ground wire (11) ; a second end (43) of the connecting element, proximal to the ground wire (11) and onto which the ground wire (11) is welded, being delimited by a continuous side wall (23) and, on such a wall, being provided with at least one pair of diametrically opposite side bosses (45) , which radially form, on the inside the connecting element (18) , respective ridges (25) adapted to bite into the surface of the gas tube in use .
EP12769722.5A 2011-08-05 2012-08-06 Thermocouple arrangement on a cooking range and associated thermocouple Withdrawn EP2739908A2 (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
IT000737A ITTO20110737A1 (en) 2011-08-05 2011-08-05 ARRANGEMENT OF THERMOCOUPLE ON AN ASSOCIATED COOKING AND THERMOCOUPLE PLAN
PCT/IB2012/054014 WO2013021342A2 (en) 2011-08-05 2012-08-06 Thermocouple arrangement on a cooking range and associated thermocouple

Publications (1)

Publication Number Publication Date
EP2739908A2 true EP2739908A2 (en) 2014-06-11

Family

ID=44584504

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12769722.5A Withdrawn EP2739908A2 (en) 2011-08-05 2012-08-06 Thermocouple arrangement on a cooking range and associated thermocouple

Country Status (3)

Country Link
EP (1) EP2739908A2 (en)
IT (1) ITTO20110737A1 (en)
WO (1) WO2013021342A2 (en)

Family Cites Families (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CH355119A (en) * 1958-03-14 1961-06-30 Contigea Societe Anonyme Gas heating appliance fitted with an electric control and safety device
DE9213202U1 (en) * 1992-10-01 1994-02-10 Robert Bosch Gmbh, 70469 Stuttgart Safety device for gas-fired devices
ITPD20020092A1 (en) * 2002-04-11 2003-10-13 Gasco Srl THERMOCOUPLE SAFETY DEVICE, PARTICULARLY FOR GAS BURNERS.
ES1054376Y (en) * 2003-03-18 2004-02-16 Vicent Manuel Valls THERMOPAR FOR GAS BURNER ELECTROVALVULES.
ITSV20030013A1 (en) * 2003-03-31 2004-10-01 Cast Srl PIN TO CONNECT A THERMOCOUPLE TO A GROUP
ATE468515T1 (en) * 2005-03-15 2010-06-15 Orkli S Coop Ltda FLAME THERMOCOUPLE AND GAS SAFETY VALVE WITH AN ELECTRICAL CONNECTION

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
None *
See also references of WO2013021342A2 *

Also Published As

Publication number Publication date
WO2013021342A2 (en) 2013-02-14
WO2013021342A3 (en) 2013-05-02
ITTO20110737A1 (en) 2013-02-06

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