EP0663678B1 - Temperaturbegrenzer - Google Patents

Temperaturbegrenzer Download PDF

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Publication number
EP0663678B1
EP0663678B1 EP95420006A EP95420006A EP0663678B1 EP 0663678 B1 EP0663678 B1 EP 0663678B1 EP 95420006 A EP95420006 A EP 95420006A EP 95420006 A EP95420006 A EP 95420006A EP 0663678 B1 EP0663678 B1 EP 0663678B1
Authority
EP
European Patent Office
Prior art keywords
temperature
temperature limiter
limiter according
magnet
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.)
Expired - Lifetime
Application number
EP95420006A
Other languages
English (en)
French (fr)
Other versions
EP0663678A1 (de
Inventor
Jean Serigny
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.)
Cotherm SA
Original Assignee
Cotherm SA
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
Priority claimed from FR9400564A external-priority patent/FR2715245B1/fr
Application filed by Cotherm SA filed Critical Cotherm SA
Publication of EP0663678A1 publication Critical patent/EP0663678A1/de
Application granted granted Critical
Publication of EP0663678B1 publication Critical patent/EP0663678B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/58—Thermally-sensitive members actuated due to thermally controlled change of magnetic permeability

Definitions

  • the present invention relates to improvements made to temperature limiters intended to ensure the safety of a heating system any heating and in particular of a halogen cooking stove and / or radiant whose heating power is regulated by a metering device energy or by any other system, because it is in this case that its application seems to be of most interest.
  • French patent 1,204,872 describes an alarm device for an engine thermal based on the sudden change in magnetic permeability (Curie point) of a pellet made of an alloy of composition appropriate and which cooperates with an elastically loaded mobile assembly in combination with a magnet so as to control the opening of the electrical circuit contacts.
  • the temperature limiter according to the French patent cited above has a main drawback concerning the nature of the materials used. Indeed, the tube containing the crew mobile is made of stainless steel, so that its expansion harms when the device is triggered precisely at the desired temperature. In the more the distance between the magnet and the pad is increased metal alloy, the more the attraction force decreases, so that the magnet is more quickly released from said pellet. It follows a decrease in the speed of tripping and resetting, because the force of the spring approaches the force of attraction between the magnet and the tablet. In addition, the stainless steel tube does not guarantee insulation electric between the metal parts and the cooking hearth under pressure.
  • the device according to the French patent considered comprises a second disadvantage consisting in the fact that the magnet is placed at the end of the device, so where the temperature is higher.
  • the limit of use of resistant permanent magnets the best at temperature is of the order of 500 ° C. So in these conditions, the magnet will quickly lose its permeability magnetic, therefore of its force of attraction.
  • the following device French patent 1,204,872 is a safety device and not a temperature limiter to operate a large number of times around the limit temperature.
  • limiters which are in the form of a probe placed near lamps or resistors and which are made up of two elements, a glass tube which practically does not expand pitch and a metal rod expanding inside said tube.
  • the relative position of the two elements must be adjusted to obtain the triggering at the right temperature, which constitutes operations long and expensive.
  • the product is fragile.
  • the improvements which are the subject of the present invention aim to remedy the aforementioned drawbacks and allow the realization of a temperature limiter which responds better than hitherto to the requirements of practice, especially when associated with a home halogen and / or radiant firing to protect the ceramic hob arranged above said hearth and receiving the utensils of cooking.
  • the temperature limiter comprises a ceramic housing communicating with at least one ceramic tube which includes an alloy pellet with a determined Curie temperature, a magnet integral with a plunger, which comprises adjustment means for the recovery of functional games, said means cooperating in the inside of the case with an elastic blade constrained so as to act as a return spring to exert a pressing force capable of controlling the opening and closing of contacts belonging to an electrical circuit.
  • the temperature limiter may further include means for controlling the opening and closing of a signaling circuit so that it is open in the temperature range between 0 and 50 to 60 ° C and closed between this temperature zone and the opening temperature of the main circuit in order, in this case, to switch on a signal lamp.
  • the limiter according to the invention is intended to replace those using the principle of differential dilation which prove on the one hand very fragile and also very bulky due to the materials used (quartz tube).
  • the limiter according to the invention is more polivalent because of its short tube which fits on different cooking zones diameters.
  • Fig. 1 is a longitudinal section of a temperature limiter according to the invention in the rest state.
  • Fig. 2 is a view similar to that of FIG. 1, but showing the limiter in operation, i.e. interrupting the circuit of the protected device.
  • Fig. 3 illustrates a first variant of the limiter of FIG. 1.
  • the high temperature limiter illustrated in fig. 1 essentially comprises a ceramic tube 1, one end of which is closed by a patch 2 made of a metal alloy with a determined point of curie, while its opposite end is integral with a housing 3 also provided in ceramic. It is observed that the face of the housing 3 on which the tube 1 is applied has a hole 3 a whose geometric axis extends that of the tube 1.
  • the housing also has a peripheral partition 3 b in which is formed a hole 3 c of which l the geometric axis corresponds to that of the hole 3 a and of the tube 1.
  • a stationary contact 4 mounted on a rigid plate 4 and a second contact 5 is supported by an elastic blade 5 of the leaf spring type.
  • a stop 3 d of the housing limits the movement of the blade 5, as will be better explained below.
  • the pellet 2 made of a metal alloy with a determined Curie point is arranged in a recess 1 a provided at the end of the tube 1.
  • the tube contains a magnet 6 which is in the form of a solid cylinder and which can move longitudinally freely in the bore of the tube 1.
  • the magnet 6 is of the ALNICO type, that is to say composed of aluminum, nickel and cobalt so that it can operate up to neighboring temperatures of 550 ° C without said magnet losing its magnetic properties.
  • a plunger made of magnetic material 7 is mounted with free sliding, one end of which is pressed against the magnet by welding, bonding or magnetism, while its other end is pierced with a smooth bore 7 a receiving a clamping screw 7 b for blocking a rod 8.
  • the latter is provided with a ceramic head 8 a allowing the spring blade to be hooked 5.
  • the rod 8 allows, due to its sliding to the inside the bore 7 a of the plunger 7 to make a length adjustment to recover differences in functional clearances incompatible with the proper functioning of the limiter. When the adjustments are made, the rod 8 is immobilized by means of the screw 7 b inside the bore 7 a of the plunger 7. It goes without saying that the Curie temperature of the plunger 7 must be greater than that of the tablet 2.
  • the housing 3 and the magnet 6 are obtained by molding or sintering at high temperature and because of the materials used undergo shrinkage important and uncontrollable during cooling.
  • the temperature of regulation is a function of the force binding the magnet 6 to the pad 2 in alloy at determined curie temperature, excluding the value thereof is inversely proportional to the square of the distance between them.
  • the elastic blade 5 is constrained, that is to say placed in its deformed position when the magnet 6 is in contact with the pad 2, while it returns to its rest position when the magnet 6 is no longer attracted to the pellet 2 due to its demagnetization by increasing the temperature in its vicinity.
  • blade 5 responsible for the elastic return of the magnet 6 and the current flow must be carried out in an alloy of the NICKEL-BERYLLIUM type which is the only one to guarantee both excellent characteristics mechanical and good electrical conductivity.
  • FIG. 3 Illustrated in fig. 3 an alternative embodiment of the limiter illustrated in fig. 1 and 2.
  • the elements corresponding to those of fig. 1 and 2 have been referenced by the same numbers and the same clues.
  • the purpose of the variant illustrated in FIG. 3 consists in addition providing means for controlling the opening and closing of a signaling circuit 11 so that it is open in the temperature range between 0 and 50 to 60 ° C. and closed between these latter temperatures and that of opening the main circuit 12 so as, in the latter case, to supply a warning lamp 11 a signaling that the device associated with the limiter in question is still hot.
  • the housing 3 is provided to receive a second tube 1 'parallel and identical to the first 1 and in which are introduced a pellet 2 ', a magnet 6' a plunger 7 'and an 8 'rod.
  • the 2 'pastille has a Curie point corresponding to about 50 to 60 ° C, different from that of tablet 2 of the first tube 1.
  • the plunger 7 ' has a bore 7' a and a screw 7 ' b for adjusting the length of the rod 8'.
  • the Curie temperature of the plunger 7 ' is also higher than that of the pellet 2'.
  • the shape of the internal partitions is slightly modified to constitute two separate spaces 3 e , 3 f separated by an internal partition 3 g .
  • the fixed contact 4 mounted on a rigid plate 4 and a second contact 5 is supported by an elastic blade 5 which is connected to the plunger 7 by means of the rod 8.
  • the contacts 4 a and 5 a of the wafer 4 and of the blade 5 are connected to the main supply circuit 12 via the terminals 9 and 10.
  • the latter contains a rigid tongue 13 the end of which comprises a fixed contact 13 a and a second elastic blade 14 which carries at its free end a movable contact 14 a .
  • the tongue 13 is connected to an output terminal 15 and the blade 14 has a output terminal 16 from which the signaling circuit is connected 11.
  • the plungers 7 and 7 ′ are connected respectively to the elastic blades 6 and 14 according to the arrangement shown in fig. 1 and 2.
  • the plungers 7, 7 ' respectively comprise an adjustable rod 8 and 8' secured to a latching system or head 8 a, 8 'is made of ceramic or metal.
  • the elastic blades 6 and 14 are previously deformed to respectively exert a pressure force between the contacts 4 a and 5 a ; 13 a and 14 a .
  • the limiter according to the invention is at the rest state, i.e. the main supply circuit 12 of the associated device can be switched on.
  • the pad 2 When we reach fifty degrees C, the pad 2 'ceases to be magnetic, so that the magnet 6' moves under the effect of the reaction of the elastic blade 14. The displacement of the plunger 7 'leads that of the magnet 6', so that the contacts 13a and 14a come to lie one on the other. In this position, the signaling circuit 11 is closed as well as the main supply circuit 12, so that the device can continue to heat. When it reaches the temperature set for the demagnetization of the pellet 2, the blade 5 acts on the magnet 6 to move it, so that the contacts 4 a and 5 a separate. Under these conditions, the supply circuit is cut.
  • the temperature drops, the contacts 4 a , 5 a close and the magnet 6 again comes into contact with the pad 2.
  • the pellet 2 'attracts the magnet 6', so that the plunger 7 'is moved, so that the blade 14 is deformed and that the contacts 13 a and 14 a separate.
  • the limiter described above is called to operate at high temperature, that is to say in an environment of 500 ° C to 600 ° C for the tube 1, 1 'and 250 ° C for the housing 3 and more particularly the part containing the contacts 4 a, 5 a, 13 a, 14 a, forcing choosing very specific materials to resist all stresses.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Hard Magnetic Materials (AREA)
  • Inorganic Insulating Materials (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Glass Compositions (AREA)
  • Meat, Egg Or Seafood Products (AREA)
  • Baking, Grill, Roasting (AREA)
  • Fuses (AREA)
  • Cookers (AREA)
  • Food-Manufacturing Devices (AREA)
  • General Induction Heating (AREA)

Claims (12)

  1. Temperaturbegrenzer mit folgenden Merkmalen:
    ein Rohr, das eine Pastille aus einer magnetisch permeablen Legierung umfaßt, deren Permeabilitätsbereich durch den Curie-Punkt begrenzt wird;
    der Temperaturbegrenzer wirkt mit einer beweglichen elastischen Einrichtung in Verbindung mit einem Magneten zusammen, der in der Lage ist, die elektrischen Kontakte eines elektrischen Hauptschaltkreises zu öffnen,
       dadurch gekennzeichnet,
    daß der Temperaturbegrenzer folgendes umfaßt:
    ein Keramikgehäuse (3), das wenigstens mit einem Rohr (1, 1') aus Keramik in Verbindung steht;
    eine Pastille (2, 2') aus einer Legierung mit bestimmter Curie-Temperatur;
    einen Magneten (6, 6'), der mit einem Tauchanker (7, 7') zusammenwirkt, der Regeleinrichtungen für die Ankerbewegung umfaßt,
    wobei die Einrichtungen im Inneren des Gehäuses (3) mit einer elastischen Lamelle (5, 14) zusammenwirken, die im Sinne einer Rückholfeder beaufschlagt wird, um eine Druckkraft auszuüben, die geeignet ist, das Öffnen und Schließen der Kontakte (4a, 5a; 14a, 13a) zu bewirken.
  2. Temperaturbegrenzer nach Anspruch 1,
    dadurch gekennzeichnet,
    daß der Tauchanker (7, 7') eine Bohrung (7a, 7'a) und eine Feststellschraube (7b, 7(b) zum Festziehen und Verriegeln einer Stange (8, 8') umfaßt.
  3. Temperaturbegrenzer nach Anspruch 2,
    dadurch gekennzeichnet,
    daß die Stange einen Kopf (8a, 8'a) umfaßt, der mit der elastischen Lamelle (5, 14) verbunden ist, um die Kontakte (4a, 5a; 14a, 13a) zu öffnen und zu schließen.
  4. Temperaturbegrenzer nach Anspruch 1,
    dadurch gekennzeichnet,
    daß der Magnet (6, 6') aus einem Material hergestellt ist, das Aluminium, Nickel und Kobalt umfaßt, um die magnetische Eigenschaft bei hohen Temperaturen beizubehalten.
  5. Temperaturbegrenzer nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die elastische Lamelle (5, 14) eine Legierung aus Nickel und Beryllium umfaßt, um die elastische Rückführung des Magneten (6, 6') und den Durchgang des elektrischen Stromes sicherzustellen.
  6. Temperaturbegrenzer nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die Curie-Temperatur des Tauchankers (7, 7') höher ist als die der Pastille (2, 2').
  7. Temperaturbegrenzer nach Anspruch 1,
    dadurch gekennzeichnet,
    daß die Regelstange (8, 8') aus einem keramischen oder metallischen Material hergestellt ist.
  8. Temperaturbegrenzer nach Anspruch 1,
    dadurch gekennzeichnet,
    daß der Magnet (6, 6') entweder durch Verklebung, über Magnetismus, oder durch Verschweißen mit dem Tauchanker (7, 7') verbunden ist.
  9. Temperaturbegrenzer nach Anspruch 1,
    dadurch gekennzeichnet,
    daß der Temperaturbegrenzer dem Brennpunkt eines Halogenheizers und/oder Strahlungsheizers zugeordnet ist.
  10. Temperaturbegrenzer nach Anspruch 1,
    dadurch gekennzeichnet,
    daß der Temperaturbegrenzer ein zweites Rohr (1') umfaßt, das parallel zu dem ersten Rohr (1) angeordnet ist und gleich ist, um ein Signalschaltkreis (11) und ein Hauptschaltkreis (12) zu schließen bzw. zu öffnen.
  11. Temperaturbegrenzer nach Anspruch 10,
    dadurch gekennzeichnet,
    daß das zweite Rohr (1') eine Pastille (2') mit einem Curie-Punkt umfaßt, der sich von dem Curie-Punkt der Pastille (2) des ersten Rohrs (1) unterscheidet.
  12. Temperaturbegrenzer nach Anspruch 11,
    dadurch gekennzeichnet,
    daß die Pastille (2') zur Steuerung des Öffnens und Schließens des Signalschaltkreises (11) vorgesehen ist, damit dieser in dem Temperaturbereich von 0 bis 50°/60° C geöffnet ist und im Temperaturbereich 50°/60° C und der Temperatur des Öffnens des Hauptschaltkreises (12) geschlossen ist.
EP95420006A 1994-01-14 1995-01-13 Temperaturbegrenzer Expired - Lifetime EP0663678B1 (de)

Applications Claiming Priority (4)

Application Number Priority Date Filing Date Title
FR9400564 1994-01-14
FR9400564A FR2715245B1 (fr) 1994-01-14 1994-01-14 Limiteur de température notamment pour foyer de cuisson.
FR9407342 1994-06-10
FR9407342A FR2715246B1 (fr) 1994-01-14 1994-06-10 Limiteur de température notamment pour foyer de cuisson.

Publications (2)

Publication Number Publication Date
EP0663678A1 EP0663678A1 (de) 1995-07-19
EP0663678B1 true EP0663678B1 (de) 1999-06-16

Family

ID=26230903

Family Applications (1)

Application Number Title Priority Date Filing Date
EP95420006A Expired - Lifetime EP0663678B1 (de) 1994-01-14 1995-01-13 Temperaturbegrenzer

Country Status (5)

Country Link
US (1) US5578982A (de)
EP (1) EP0663678B1 (de)
AT (1) ATE181456T1 (de)
DE (1) DE69510241T2 (de)
FR (1) FR2715246B1 (de)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19814985A1 (de) * 1998-04-03 1999-10-07 Ego Elektro Geraetebau Gmbh Heißanzeige-Schalteinrichtung
JP2000285776A (ja) * 1999-03-31 2000-10-13 Sanyo Electric Co Ltd サーモスタットとこのサーモスタットを内蔵するパック電池
US20070057752A1 (en) * 2005-09-15 2007-03-15 Youfa Wang Heat actuated magnetic latching microswitch
CN103107045B (zh) * 2013-01-23 2016-04-13 佛山市川东磁电股份有限公司 一种组装方便的微型温敏磁控开关

Family Cites Families (9)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2794100A (en) * 1955-08-16 1957-05-28 Wilhelm Baier Kg Thermal relay
FR1204872A (fr) * 1958-10-14 1960-01-28 Fr Chauvin Arnoux Soc Dispositif d'alarme pour moteurs thermiques
FR1308737A (fr) * 1961-09-29 1962-11-09 Comp Generale Electricite Relais thermo-magnétique
DE1939214U (de) * 1962-11-24 1966-05-26 Continental Elektro Ind Ag Einstellbarer temperaturregler, insbesondere fuer elektrische kochplatten.
FR2064476A5 (de) * 1969-09-08 1971-07-23 Equip Seim
DE2812513A1 (de) * 1978-03-22 1979-09-27 Danfoss As Thermomagnetischer thermostat
US4288770A (en) * 1979-11-28 1981-09-08 General Electric Company Thermal override for static trip circuit breakers
DE3543562A1 (de) * 1985-12-10 1987-06-11 Hella Kg Hueck & Co Uebertemperatursicherung fuer heizeinrichtungen
US4878038A (en) * 1987-12-07 1989-10-31 Tsai James T Circuit protection device

Also Published As

Publication number Publication date
FR2715246B1 (fr) 1998-02-06
DE69510241T2 (de) 1999-12-09
ATE181456T1 (de) 1999-07-15
US5578982A (en) 1996-11-26
DE69510241D1 (de) 1999-07-22
FR2715246A1 (fr) 1995-07-21
EP0663678A1 (de) 1995-07-19

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