EP1079406A1 - Übertemperaturschutzvorrichtung - Google Patents
Übertemperaturschutzvorrichtung Download PDFInfo
- Publication number
- EP1079406A1 EP1079406A1 EP00111463A EP00111463A EP1079406A1 EP 1079406 A1 EP1079406 A1 EP 1079406A1 EP 00111463 A EP00111463 A EP 00111463A EP 00111463 A EP00111463 A EP 00111463A EP 1079406 A1 EP1079406 A1 EP 1079406A1
- Authority
- EP
- European Patent Office
- Prior art keywords
- temperature
- protection device
- overtemperature protection
- spring
- 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.)
- Granted
Links
Images
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 is preferable for an electrical device with 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.
- Overtemperature protection devices are generally made 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.
- Such 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 known overtemperature protection device includes a Plastic housing in which the temperature-dependent switch from is inserted below. At the upper connection contact of the a terminal lug is soldered to the temperature-dependent switch, through the plastic housing extends outside and there the external connection of the heating plate serves. The second connection contact of the temperature-dependent Switch is formed by the bottom of the housing that on a contact surface of the heating plate rests there both for provides electrical as well as thermal contact.
- the plastic housing is held by a metal bracket that is soldered or glued to the hotplate and so the Bottom of the temperature-dependent switch on the contact surface presses.
- 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 generate a short circuit with this, so that this construction overall security concerns in particular encountered such electrical devices that are frequently transported be so that there is a risk of loosening the cable lug.
- overtemperature protection devices are used for hot plates, such as those used in coffee machines, hot plates, Kettles, hot plates, etc. can be found. With these Heating plates pose a high safety risk in the event of overheating, e.g. due to drying out of a heated / warmed Vessel so that an overtemperature protection device, as is known from DE 195 07 410 A1, often alone is not sufficient, so that in addition to this Temperature control, which is also based on a PT 100 resistor can take place, a fuse or the like Overheating protection device is used.
- melting temperature safeguards a certain percentage of the products are tested and thus destroyed, reliability using statistical methods of the untested fuses is determined to which then a certain statistical functional reliability is attributed becomes. A hundred percent testing is obvious Reasons not possible.
- the object of the invention is at the outset mentioned overtemperature protection device on the one hand solved by having a preferably removable on the Device-mountable temperature-dependent switch with a Switch-back temperature below room temperature, preferably below 10 ° C, more preferably below about 5 ° C includes.
- the object underlying the invention is based on this Way completely solved.
- the inventors of the present application have recognized that that even with temperature-dependent switches overtemperature protection devices let create the circuit of the protected electrical device irreversibly. For this the usually low switching hysteresis is required to enlarge so that the temperature-dependent switch only far below the usual operating temperatures for the protected electrical devices.
- This deep Switch-back temperature can be adjusted using a special bimetal material, through the embossing and a special after-treatment achieve in a manner familiar to the person skilled in the art.
- Another advantage is that the switch to not exchanged a response, but after a corresponding one Repair of the device by using e.g. from cold spray can be closed again.
- an overtemperature protection device becomes available for the first time provided that take advantage of temperature dependent Switches with regard to testability and repair combines the safety advantages of fuses, because an unintentional restart of a defective device, where the new overtemperature protection device is installed and has responded, becomes like a fuse prevented.
- the overtemperature protection device has a holder which is releasably attached under spring tension the device can be locked.
- This measure has the advantage that by Spring tension for a good electrical and thermal Contact to the device is taken care of, so that by the good Temperature connection overheating the device efficiently is prevented.
- the spring tension by a spring provided to the holder is provided and if preferred the temperature-dependent switch on its bottom has a first connection contact via which both electrical as well as thermal contact to the device is, preferably also the temperature-dependent Switch is mounted on the spring on the holder.
- the overtemperature protection device can thus be a small compact Unit that can be used when locking the device e.g. securely held by the spring in the manner of a bayonet lock is, 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 their force the temperature-dependent switch in the housing can be inserted.
- This measure is also constructively advantageous because the temperature-dependent switch is through it 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 also relevant safety-related aspects of advantage, because once tested overtemperature protection device can not 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 unintended destruction in the Assembly is prevented.
- the bore is a stepped bore is in its section with a larger diameter the spring sits.
- the bore is a Through hole is in which a radially inwardly projecting 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 by the housing can be contacted, preferably on a contact lug is attached to the second connection contact, which protrudes upwards in the housing through the spring.
- 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 is, in turn, of constructive advantage, because in the housing of the device only needs an insertion opening for the new overtemperature protection device may be provided, wherein a contact surface on the heating substrate under the insertion opening must be released. Simply by pushing it in and twisting / locking the overtemperature protection device the electrical as well as the thermal contact becomes too the heating substrate, the spring mechanical Compensates tolerances and temperature-related dimensional changes.
- this measure offers constructive advantages, both External connections of the device are made via the new overtemperature protection devices, so that for the assembly the above advantages mentioned apply.
- Another advantage lies 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 open for a long time until e.g. of cold spray too this temperature-dependent switch is closed again.
- FIG. 1 10 is a schematically illustrated electrical Device called 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 bimetallic 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 into an upper portion 40 of the stepped bore 26 protrudes.
- a conventional cable lug is on this contact lug 39 postponed by 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 still has two each other 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 Overtemperature 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.
- 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)
- Control Of Resistance Heating (AREA)
- Central Heating Systems (AREA)
- Details Of Indoor Wiring (AREA)
- Fuses (AREA)
- Amplifiers (AREA)
- Control Of Eletrric Generators (AREA)
Abstract
Description
- Fig. 1
- in einer schematischen Ansicht ein elektrisches Gerät mit zwei neuen Übertemperaturschutzvorrichtungen;
- Fig. 2
- in einer geschnittenen Seitenansicht die Übertemperaturschutzvorrichtung aus Fig. 1 in einem ersten Ausführungsbeispiel;
- Fig. 3
- in einer Darstellung wie Fig. 2 ein zweites Ausführungsbeispiel der Übertemperaturschutzvorrichtung;
- Fig. 4
- ein schematisches Schaltdiagramm der neuen Übertemperaturschutzvorrichtung;
- Fig. 5
- eine Draufsicht auf die Isolationsplatte aus Fig. 1, im vergrößerten Ausschnitt; und
- Fig. 6
- eine Ansicht auf die Übertemperaturschutzvorrichtung aus Fig. 2 in Richtung des Pfeiles VI.
Claims (17)
- Übertemperaturschutzvorrichtung, die für ein elektrisches Gerät (10) mit vorzugsweise einer Heizplatte (11) vorgesehen und elektrisch zu dem Gerät (10) in Reihe schaltbar ist, um bei Übertemperatur dessen Spannungsversorgung (18) wegzuschalten,
dadurch gekennzeichnet, daß sie einen vorzugsweise abnehmbar an dem Gerät (10) montierbaren temperaturabhängigen Schalter (19) mit einer Rückschalttemperatur unterhalb von Raumtemperatur, vorzugsweise unterhalb von 10° C, weiter vorzugsweise unterhalb von ca. 5° C aufweist. - übertemperaturschutzvorrichtung nach Anspruch 1, dadurch gekennzeichnet, daß sie einen Halter (24) aufweist, der unter Federspannung lösbar an dem Gerät (10) verriegelbar ist.
- Übertemperaturschutzvorrichtung nach Anspruch 2, dadurch gekennzeichnet, daß die Federspannung durch eine an dem Halter (24) vorgesehene Feder (28) bereitgestellt wird.
- Übertemperaturschutzvorrichtung nach einem der Ansprüch 1 bis 3, dadurch gekennzeichnet, daß der temperaturabhängige Schalter (19) an seinem Boden (35) einen ersten Anschlußkontakt (36) aufweist, über den sowohl elektrischer als auch thermischer Kontakt zu dem Gerät (10) herstellbar ist.
- Übertemperaturschutzvorrichtung nach einem der Ansprüche 2 bis 4, dadurch gekennzeichnet, daß der temperaturabhängige Schalter (19) über eine Feder (28) an dem Halter (24) gelagert ist.
- Übertemperaturschutzvorrichtung nach einem der Ansprüche 2 bis 5, dadurch gekennzeichnet, daß der Halter (24) ein hohles, zylinderförmiges Gehäuse (25) aufweist, in dem eine Feder (28) angeordnet ist, gegen deren Kraft der temperaturabhängige Schalter (19) in das Gehäuse (25) einschiebbar ist.
- Übertemperaturschutzvorrichtung nach Anspruch 6, dadurch gekennzeichnet, daß das Gehäuse (25) an seiner Außenwand (41) zumindest einen, vorzugsweise zwei einander diametral gegenüberliegende Rastvorsprünge (42) aufweist.
- Übertemperaturschutzvorrichtung nach Anspruch 6 oder 7, dadurch gekennzeichnet, daß das Gehäuse (25) an seinem oberen, von dem temperaturabhängigen Schalter (19) abgelegenen Ende einen Anlagebund (43) aufweist.
- Übertemperaturschutzvorrichtung nach einem der Ansprüche 1 bis 8, dadurch gekennzeichnet, daß der temperaturabhängige Schalter (19) in einem gestuften Halteteil (33) sitzt, aus dem nach unten der temperaturabhängige Schalter (19) mit seinem Boden (35) hervorsteht und auf dessen oberem Schaft (32) eine Feder (28) mit ihrem ersten Ende (31) sitzt.
- Übertemperaturschutzvorrichtung nach Anspruch 9, dadurch gekennzeichnet, daß die Feder (28) mit ihrem zweiten Ende (29) in einer Bohrung (26) in dem Gehäuse (25) eingeklemmt ist.
- Übertemperaturschutzvorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die Bohrung (26) eine Stufenbohrung ist, in deren Abschnitt (27) mit größerem Durchmesser die Feder (28) sitzt.
- Übertemperaturschutzvorrichtung nach Anspruch 10, dadurch gekennzeichnet, daß die Bohrung eine Durchgangsbohrung (46) ist, in der ein radial nach innen vorspringender Kragen (47) vorgesehen ist, an dem sich die Feder (28) abstützt und der temperaturabhängige Schalter (19) gegen die Kraft der Feder (28) gehalten ist.
- Übertemperaturschutzvorrichtung nach einem der Ansprüche 4 bis 12, dadurch gekennzeichnet, daß an dem temperaturabhängigen Schalter (19) ein zweiter Anschlußkontakt (38) vorgesehen ist, der durch das Gehäuse (25) hindurch kontaktierbar ist.
- Übertemperaturschutzvorrichtung nach Anspruch 13, dadurch gekennzeichnet, daß an dem zweiten Anschlußkontakt (38) eine Kontaktfahne (39) befestigt ist, die in dem Gehäuse (25) durch die Feder (28) hindurch nach oben ragt.
- Elektrisches Gerät mit mindestens einer Übertemperaturschutzvorrichtung (16) nach einem der Ansprüche 1 bis 14.
- Elektrisches Gerät nach Anspruch 15, dadurch gekennzeichnet, daß es eine Heizplatte (11) umfaßt, auf deren Heizsubstrat (12) der temperaturabhängige Schalter (19) mit seinem Boden (35) unter der Kraft einer Feder (28) aufliegt.
- Elektrisches Gerät nach Anspruch 15 oder 16, dadurch gekennzeichnet, daß zwei Übertemperaturschutzvorrichtungen (16) vorgesehen sind, die derart beide mit dem Gerät (10) in Reihe geschaltet ist, daß sie beide Außenanschlüsse des Gerätes (10) bilden.
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 true EP1079406A1 (de) | 2001-02-28 |
EP1079406B1 EP1079406B1 (de) | 2003-10-01 |
Family
ID=7918444
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00111463A Expired - Lifetime EP1079406B1 (de) | 1999-08-14 | 2000-05-27 | Übertemperaturschutzvorrichtung |
Country Status (5)
Country | Link |
---|---|
EP (1) | EP1079406B1 (de) |
AT (1) | ATE251336T1 (de) |
DE (2) | DE19938638C2 (de) |
ES (1) | ES2206105T3 (de) |
PT (1) | PT1079406E (de) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19704563A1 (de) * | 1997-02-07 | 1998-08-13 | Thermik Geraetebau Gmbh | Vorrichtung zum Schützen eines Gerätes |
DE19705410A1 (de) * | 1997-02-13 | 1998-08-20 | Thermik Geraetebau Gmbh | Temperaturabhängiger Schalter mit Haltebügel |
Family Cites Families (6)
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 |
-
1999
- 1999-08-14 DE DE19938638A patent/DE19938638C2/de not_active Expired - Fee Related
-
2000
- 2000-05-27 ES ES00111463T patent/ES2206105T3/es not_active Expired - Lifetime
- 2000-05-27 EP EP00111463A patent/EP1079406B1/de not_active Expired - Lifetime
- 2000-05-27 DE DE50003887T patent/DE50003887D1/de not_active Expired - Fee Related
- 2000-05-27 AT AT00111463T patent/ATE251336T1/de not_active IP Right Cessation
- 2000-05-27 PT PT00111463T patent/PT1079406E/pt unknown
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19704563A1 (de) * | 1997-02-07 | 1998-08-13 | Thermik Geraetebau Gmbh | Vorrichtung zum Schützen eines Gerätes |
DE19705410A1 (de) * | 1997-02-13 | 1998-08-20 | Thermik Geraetebau Gmbh | Temperaturabhängiger Schalter mit Haltebügel |
Also Published As
Publication number | Publication date |
---|---|
ES2206105T3 (es) | 2004-05-16 |
PT1079406E (pt) | 2004-02-27 |
EP1079406B1 (de) | 2003-10-01 |
DE50003887D1 (de) | 2003-11-06 |
ATE251336T1 (de) | 2003-10-15 |
DE19938638A1 (de) | 2001-03-15 |
DE19938638C2 (de) | 2003-04-24 |
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