EP1079406B1 - Dispositif de protection contre l'excès de température - Google Patents

Dispositif de protection contre l'excès de température Download PDF

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Publication number
EP1079406B1
EP1079406B1 EP00111463A EP00111463A EP1079406B1 EP 1079406 B1 EP1079406 B1 EP 1079406B1 EP 00111463 A EP00111463 A EP 00111463A EP 00111463 A EP00111463 A EP 00111463A EP 1079406 B1 EP1079406 B1 EP 1079406B1
Authority
EP
European Patent Office
Prior art keywords
overtemperature protection
temperature
spring
protection apparatus
dependent switch
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP00111463A
Other languages
German (de)
English (en)
Other versions
EP1079406A1 (fr
Inventor
Michael Becher
Edwin Güttinger
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.)
Thermik Geraetebau GmbH
Original Assignee
Thermik Geraetebau GmbH
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 Thermik Geraetebau GmbH filed Critical Thermik Geraetebau GmbH
Publication of EP1079406A1 publication Critical patent/EP1079406A1/fr
Application granted granted Critical
Publication of EP1079406B1 publication Critical patent/EP1079406B1/fr
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
    • H01H37/04—Bases; Housings; Mountings
    • H01H37/043—Mountings on controlled apparatus
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/002—Thermally-actuated switches combined with protective means
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/04—Bases; Housings; Mountings
    • H01H37/06—Bases; Housings; Mountings to facilitate replacement, e.g. cartridge housing
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/64—Contacts
    • H01H37/70—Resetting means

Definitions

  • the present invention relates to an overtemperature protection device, which for an electrical device with preferably a hot plate provided and electrically to the device can be connected in series to its voltage supply in the event of overtemperature switch off with a temperature-dependent switch, which has a first connection contact on its bottom, via both electrical and thermal contact the device can be manufactured.
  • Such an overtemperature protection device is from DE-A1-197 05 410 known.
  • Overtemperature protection devices are generally state of the art known in the art. On the one hand, they serve one overheated electrical equipment, such as a hair dryer, temporarily turn off until it cools down again has that it can be operated safely.
  • Over-temperature protection devices usually include temperature dependent switch with a temperature dependent deforming member, e.g. made of memory metal, made of bimetal or can be made of trimetal.
  • the overtemperature protection device known from the aforementioned DE-A1-197 05 410 comprises a plastic housing, in that the temperature-dependent switch is inserted from below becomes.
  • a terminal lug soldered through the Plastic housing extends outwards and there the External connection of the heating plate is used.
  • the second connection contact the temperature-dependent switch is through its housing bottom formed, which rests on a contact surface of the heating plate and there for both electrical and thermal Contact ensures.
  • the plastic housing is held by a metal bracket that is soldered or glued to the heating plate and so the Bottom of the temperature-dependent switch on the contact surface suppressed.
  • this overtemperature protection device is a reliable one Control and monitoring of the temperature of the heating plate enables it shows a number of constructive disadvantages on. For example, does not guarantee that the pressure force, with which the metal bracket the bottom of the temperature-dependent Presses the switch on the contact surface in all operating states for a good electrical and thermal Contact ensures.
  • Another disadvantage is that a large metal bracket is used, e.g. at a Loosen the contact shoe pushed onto the connection lug can produce a short circuit with this, so that this construction overall security concerns especially with such encountered electrical devices that are frequently transported so that there is a risk of loosening the cable lug.
  • the object underlying the invention is at the outset solved overtemperature protection device, that it has a holder for the temperature-dependent switch, which can be releasably locked to the device under spring tension is.
  • the inventors of the present application have recognized that that by the spring tension for good electrical and thermal contact to the device is ensured, so that by the good temperature connection overheating the device efficiently is prevented.
  • overtemperature protection device to be small compact unit can be designed when locking to the Device e.g. in the manner of a bayonet lock by the spring is held securely, the spring also simultaneously for good electrical and thermal contact between the temperature dependent Switches and the device ensures and mechanical Can compensate for changes in distance.
  • the holder is a hollow, cylindrical one Has housing in which the spring is arranged against the force of the temperature-dependent switch in the housing can be inserted.
  • This measure is also structurally advantageous because the temperature-dependent one Switch is through him at least partially surrounding housing protected before and when the overtemperature protection device on the electrical to be protected Device is mounted. This measure is therefore also regarding safety-related aspects of advantage, because once tested overtemperature protection device cannot be caused by improper Handling before or during installation in the protective device may be damaged or destroyed.
  • the housing on its upper, from the temperature-dependent switch remote end a system bundle having.
  • the temperature-dependent switch sits in a stepped holding part, from which the Bottom of the temperature-dependent switch protrudes and on whose upper shaft the spring sits with its first end, whereby preferably the spring with its second end in one Hole is clamped in the housing.
  • This measure is also preferred from a design point of view, because through the Holding part results in a guide of the temperature-dependent Switch in the housing, so that tilting during assembly is prevented. As a result, a secure fit of the temperature-dependent switch on the device to be protected, furthermore an unintentional destruction in the Assembly is prevented.
  • the bore is a stepped bore is in its section with a larger diameter the spring sitting.
  • the bore is a Through hole is in the one projecting radially inwards Collar is provided on which the spring is supported and the temperature-dependent switch against the force of the Spring is held.
  • a second connection contact is provided, which by the housing can be contacted, preferably on a contact lug is attached to the second connection contact, which projects upwards through the spring in the housing.
  • the invention further relates to an electrical one Device with at least one new overtemperature protection device, as described above.
  • the device comprises a heating plate, on the heating substrate the bottom of the temperature-dependent Switch rests under the force of the spring.
  • this measure offers constructive advantages, both External connections of the device are made via the new overtemperature protection devices, so that for mounting the above advantages mentioned apply.
  • Another advantage is in safety aspects, because even if an overtemperature protection device malfunction or too high would have shutdown temperature, would be the shutdown security guaranteed by the other overtemperature protection device. The same applies to the switch-back temperature. Self if one of the two overtemperature protection devices is one would have such a switch-back temperature that it is in the range the room temperature already closes again, so it lasts the other overtemperature protection device the circuit so long opened until e.g. of cold spray too this temperature-dependent switch is closed again.
  • FIG. 1 10 is a schematically illustrated electrical Device referred to that a heating plate 11 with a heating substrate 12 and an insulating plate 14 covering this.
  • the insulation plate 14 In the insulation plate 14 are two through holes 15, in which overtemperature protection devices 16 are arranged, the Detachable on the heating plate 11 in the manner of a bayonet catch are attached.
  • the overtemperature protection devices 16 are at their lower End with the heating substrate 12 and at its upper end with one Power supply 18 connected such that they are in series arranged between the voltage supply 18 and the heating substrate 12 are.
  • a temperature-dependent one indicated schematically at 19 Switch arranged which when reaching a certain Switching temperature ST the electrical connection between the substrate 12 and the voltage supply 18 opens and thus prevents the heating plate 12 from overheating.
  • a temperature sensor is in the heating substrate 12 for temperature control of type PT 100 arranged with a temperature control circuit 22 is connected, which in turn the Power supply 18 controls.
  • the temperature of the heating plate 11 is thus via the temperature sensor 21 and the temperature control circuit 22 controlled. If there is a defect in this temperature control the heating plate 11 continues to heat up unhindered, until the switching temperature ST is reached and the two Open temperature-dependent switch 19.
  • This switching behavior the overtemperature protection devices 16 is shown in FIG. 4, where on the X axis the temperatures and on the Y axis the two switching states with 1 for on and 0 for off are indicated.
  • FIG. 4 shows switching diagram opens the switch at Exceeding the temperature ST.
  • the switch cools down switch 19 remains at room temperature RT open, only when the temperature drops significantly below RT, in the selected embodiment is below 5 ° C, closes switch 19 again, and that shown in FIG The hysteresis curve closes.
  • the two overtemperature protection devices work 16 like fuses after the temperature-dependent Switch 19 was opened once, it closes at usual Operating conditions not even when the power supply 18 is completely switched off. Only by cooling down overtemperature protection devices 16, e.g. by means of a cold spray to below 5 ° C, the switch is closed again.
  • a hysteresis curve as shown in Fig. 4 is unusual for temperature-dependent switches, but it can be by choosing the right bimetal material Embossing the active made from the bimetal material Switching element and the after-treatment of this switching element adjust in a manner known per se to the person skilled in the art.
  • the overtemperature protection device 16 a Includes holder 24, which has a housing 25 made of insulating material, in which a stepped bore 26 is provided.
  • the stepped bore bears in its lower, larger diameter Section 27 a compression spring 28 with its upper End 29 clamped captive in the lower section 27 is.
  • the compression spring 28 is on a shaft 32 of a stepped holding part 33 pushed so that Holding part 33 captive in the lower via the compression spring 28 Section 27 is held and against the force of the compression spring 28 can be inserted into the stepped bore 26.
  • the holding part 33 carries at its lower end in one there provided opening 34 a temperature-dependent switch 19th of a design known per se.
  • a temperature-dependent switch 19th of a design known per se.
  • An example of one Temperature-dependent switch 19 is described in DE 21 21 802 A1.
  • the temperature-dependent switch 19 comprises a metallic housing, that with its bottom 35 down from the opening 34 protrudes.
  • the bottom 35 is also the first connection contact 36 designed for the temperature-dependent switch 19.
  • the temperature-dependent switch 19 has at its upper end a second connection contact 38 to which a contact tab 39 is soldered, which extends through the holding part 33 and in an upper portion 40 of the stepped bore 26 protrudes.
  • a conventional cable lug is on this contact lug 39 postponed, the. through the housing 25 surrounding it is well insulated on the outside.
  • the holding part 33 is either temperature-dependent Switch 19 sprayed around with soldered contact lug 39 or but prefabricated so that the switch 19 with terminal lug 39 pushed from below into the opening 34 and clamped there become.
  • the housing 25 On its outer wall 41, the housing 25 has two more diametrically opposite locking projections 42 on which it comes into contact with the insulation plate 14. Furthermore, is still a system collar 43 is provided, through which the Overheating protection device 16 too far into the through holes 15 can be inserted.
  • FIG. 3 shows a second exemplary embodiment in a representation like FIG. 2 the overtemperature protection device 16 shown in which a through hole 46 is provided in the housing 25 is in which a radially inwardly projecting collar 47 e.g. is provided in the form of a snap ring.
  • the holding part 33 has an upper shoulder 48 and a lower shoulder 49, with the upper shoulder 48 lying on the collar 47, so that the holding part 33 in Fig. 3 is not down from the housing 25 can fall out.
  • the compression spring 28 already known from FIG. 2 arranged, which pushes the holding part 33 down.
  • Fig. 3 is the overtemperature protection device in a view from below 16 shown in Fig. 2 and leaves the two Recognize locking projections 42 well again.
  • the relative movement between the housing 25 and the holding part 33 is made possible by the compression spring 28 in the stepped bore 26 and / or on the shaft 32 is rotatable without however, in the removed state, the holding part 33 from the stepped bore 26 can fall out.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Details Of Indoor Wiring (AREA)
  • Fuses (AREA)
  • Control Of Resistance Heating (AREA)
  • Central Heating Systems (AREA)
  • Amplifiers (AREA)
  • Control Of Eletrric Generators (AREA)

Claims (15)

  1. Dispositif de protection contre les températures trop élevées, qui est prévu pour un appareil électrique (10) avec de préférence une plaque chauffante (11) et qui fait l'objet d'un branchement électrique en série avec l'appareil (10) pour couper son alimentation en tension (18) en cas de température trop élevée, avec un interrupteur thermostatique, qui comprend sur son fond (35) un premier contact de raccordement (36) par l'intermédiaire duquel il est possible de réaliser aussi bien un contact électrique qu'un contact thermique avec l'appareil (10), caractérisé en ce qu'il comprend pour l'interrupteur thermostatique (19) un support (24) qui est verrouillé de manière amovible sur l'appareil (10) par la contrainte imposée par un ressort.
  2. Dispositif de protection contre les températures trop élevées selon la revendication 1, caractérisé en ce que la contrainte imposée par un ressort est mise à disposition par un ressort (28) prévu sur le support (24).
  3. Dispositif de protection contre les températures trop élevées selon la revendication 2, caractérisé en ce que l'interrupteur thermostatique (19) est positionné sur le support (24) par l'intermédiaire du ressort (28).
  4. Dispositif de protection contre les températures trop élevées selon la revendication 2 ou 3, caractérisé en ce que le support (24) comprend un boítier creux de forme cylindrique (25), dans lequel est disposé le ressort (28) contre la force duquel l'interrupteur thermostatique (19) peut être introduit dans le boítier (25).
  5. Dispositif de protection contre les températures trop élevées selon la revendication 4, caractérisé en ce que le boítier (25) comprend sur sa paroi extérieure (41) au moins une, de préférence deux saillies d'arrêt (42) diamétralement opposées l'une à l'autre.
  6. Dispositif de protection contre les températures trop élevées selon la revendication 4 ou 5, caractérisé en ce qu'à son extrémité supérieure éloignée de l'interrupteur thermostatique (19) le boítier (25) comprend une collerette d'appui (43).
  7. Dispositif de protection contre les températures trop élevées selon l'une quelconque des revendications 2 à 6, caractérisé en ce que l'interrupteur thermostatique (19) est placé dans une partie de maintien étagée (33), à partir de laquelle le fond (35) de l'interrupteur thermostatique (19) dépasse vers le bas et sur l'épaulement supérieur (32) de laquelle s'appuie la première extrémité (31) du ressort (28).
  8. Dispositif de protection contre les températures trop élevées selon la revendication 7, caractérisé en ce que la deuxième extrémité (29) du ressort (28) est enserrée dans une forure (26) du boítier (25).
  9. Dispositif de protection contre les températures trop élevées selon la revendication 8, caractérisé en ce que la forure (26) est une forure étagée, dans la section de diamètre plus important (27) de laquelle est placé le ressort (28).
  10. Dispositif de protection contre les températures trop élevées selon la revendication 8, caractérisé en ce que la forure est une forure traversant de part en part (46), dans laquelle est prévu un collet (47) s'avançant dans le sens radial vers l'intérieur, sur lequel s'appuie le ressort (28) et par lequel l'interrupteur thermostatique (19) est maintenu contre la force du ressort (28).
  11. Dispositif de protection contre les températures trop élevées selon l'une quelconque des revendications précédentes, caractérisé en ce que sur l'interrupteur thermostatique (19) est prévu un deuxième contact de raccordement (38), avec lequel il peut être établi une liaison à travers le boítier (25).
  12. Dispositif de protection contre les températures trop élevées selon la revendication 11, caractérisé en ce que sur le deuxième contact de raccordement (38) est fixée une languette de contact (39), qui s'étend vers le haut à l'intérieur du boítier (25) en traversant le ressort (28).
  13. Appareil électrique avec au moins un dispositif de protection contre les températures trop élevées (16) selon l'une quelconque des revendications 1 à 12.
  14. Appareil électrique avec au moins un dispositif de protection contre les températures trop élevées (16) selon l'une quelconque des revendications 2 à 10, caractérisé en ce qu'il comprend une plaque chauffante (11), sur le substrat chauffant (12) de laquelle le fond (35) de l'interrupteur thermostatique (19) est appliqué sous l'action de la force du ressort (28).
  15. Appareil électrique selon la revendication 13 ou 14, caractérisé en ce que deux dispositifs de protection contre les températures trop élevées (16) sont prévus, les deux étant commutés de telle manière en série avec l'appareil (10) qu'ils forment les deux points de branchement extérieurs de l'appareil (10).
EP00111463A 1999-08-14 2000-05-27 Dispositif de protection contre l'excès de température Expired - Lifetime EP1079406B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19938638 1999-08-14
DE19938638A DE19938638C2 (de) 1999-08-14 1999-08-14 Übertemperaturschutzvorrichtung

Publications (2)

Publication Number Publication Date
EP1079406A1 EP1079406A1 (fr) 2001-02-28
EP1079406B1 true EP1079406B1 (fr) 2003-10-01

Family

ID=7918444

Family Applications (1)

Application Number Title Priority Date Filing Date
EP00111463A Expired - Lifetime EP1079406B1 (fr) 1999-08-14 2000-05-27 Dispositif de protection contre l'excès de température

Country Status (5)

Country Link
EP (1) EP1079406B1 (fr)
AT (1) ATE251336T1 (fr)
DE (2) DE19938638C2 (fr)
ES (1) ES2206105T3 (fr)
PT (1) PT1079406E (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2121802C3 (de) * 1971-05-03 1974-10-24 Thermik-Geraetebau Gmbh + Co, 7530 Pforzheim Temperaturwächter
US4446450A (en) * 1982-12-15 1984-05-01 Texas Instruments Incorporated Thermostat device having improved mounting means
DE3817080A1 (de) * 1987-06-06 1988-12-15 Hanning Elektro Werke Temperaturueberwachungseinrichtung fuer spaltpolmotoren
US4823105A (en) * 1988-08-04 1989-04-18 Portage Electric Products, Inc. Method of forming a thermostatic switch with a narrow operating temperature range
US5489762A (en) * 1994-05-25 1996-02-06 Texas Instruments Incorporated Appliances having resistive heating elements and thermal protective apparatus used therewith
US5621370A (en) * 1995-03-14 1997-04-15 St. Louis; Robert Mounting arrangement for thermostat in a clothes dryer
DE19704563B4 (de) * 1997-02-07 2005-07-21 Thermik Gerätebau GmbH Vorrichtung zum Schützen eines Gerätes
DE19705410C2 (de) * 1997-02-13 1999-02-11 Thermik Geraetebau Gmbh Temperaturabhängiger Schalter mit Haltebügel

Also Published As

Publication number Publication date
DE50003887D1 (de) 2003-11-06
PT1079406E (pt) 2004-02-27
ATE251336T1 (de) 2003-10-15
DE19938638C2 (de) 2003-04-24
DE19938638A1 (de) 2001-03-15
ES2206105T3 (es) 2004-05-16
EP1079406A1 (fr) 2001-02-28

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