EP0858091B1 - Vorrichtung zum Schützen eines Gerätes - Google Patents

Vorrichtung zum Schützen eines Gerätes Download PDF

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Publication number
EP0858091B1
EP0858091B1 EP97117930A EP97117930A EP0858091B1 EP 0858091 B1 EP0858091 B1 EP 0858091B1 EP 97117930 A EP97117930 A EP 97117930A EP 97117930 A EP97117930 A EP 97117930A EP 0858091 B1 EP0858091 B1 EP 0858091B1
Authority
EP
European Patent Office
Prior art keywords
housing
electrode
switching mechanism
temperature
anyone
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
EP97117930A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0858091A3 (de
EP0858091A2 (de
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 EP0858091A2 publication Critical patent/EP0858091A2/de
Publication of EP0858091A3 publication Critical patent/EP0858091A3/de
Application granted granted Critical
Publication of EP0858091B1 publication Critical patent/EP0858091B1/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
    • H01H37/006—Thermally-actuated switches with different switches operated at substantially different temperatures
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/58—Electric connections to or between contacts; Terminals
    • 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
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic element
    • H01H37/54—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting
    • H01H37/5427—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting encapsulated in sealed miniaturised housing

Definitions

  • the present invention relates to a device for protecting a device, with two each having at least two temperature-dependent switching positions, temperature-dependent switching mechanisms and at least two external connections, both switching mechanisms are arranged directly in a common housing such that each derailleur depending on its temperature associated with him first and second external connection connects directly to a central connection, which is common to both switching mechanisms and is preferably designed as a third external connection.
  • One known from DE 42 05 699 device comprises two independent, temperature-dependent switch, each having its own, electrically conductive housing base.
  • the lower housing part accommodates a bimetallic switching mechanism and serves as the first external connection.
  • the lower housing part is closed by a cover, on which the second outer terminal of the respective switch is provided.
  • the two switches are arranged side by side or one above the other, wherein in each case a PTC heating block is provided between or under the housing lower parts, so that a series connection of the two switches and the intermediate heating resistor is formed.
  • the two switches and the heating resistor are insulated by an insulating tube or a surrounding housing to the outside, from the outside only the two provided on the respective lid outer terminals and an outer terminal formed by a housing base are accessible.
  • the switch disposed between the first and second outer terminals is an opener.
  • the other switch is a make contact, wherein the series circuit formed by this switch and the heating resistor is located between the second and third external connection.
  • the normally closed contact and the normally open contact have the same changeover temperature.
  • the known device is used for overtemperature protection of a load in which in case of failure only such a small residual current flows, that this is not sufficient for the usual latching by a series connected to the load heating resistor.
  • the NC is now placed in series with the load, while the series circuit of NO and heating resistor is parallel to the load.
  • the opener now decouples the load from the power supply, while the closer connects the heating resistor to the power supply, so that the heat developed in the heating resistor can be used to hold the normally closed and normally open in their high temperature positions.
  • the known device is thus designed for a very specific purpose, with the disadvantage that two independent switches are used, so that not only the overall dimensions are large, but also the overall design effort is very high, which is associated with corresponding costs ,
  • temperature-dependent switch which has a temperature-dependent switching mechanism in the form of a bimetallic snap disk.
  • the switch has an electrically conductive housing in which the bimetallic snap disk is guided circumferentially.
  • the housing serves as the center of the switch.
  • the bimetallic snap-in disc is in contact with one of two spring-loaded rams with its central area, which are kept isolated from the housing and each form one of the two other external connections.
  • the bimetallic snap disk produces an electrically conductive connection between the center connection and one of the two other external connections. Because of the required insulation between the housing and the two spring-loaded plungers of the known switch is mechanically very complex and bulky. In addition, the electrically conductive housing must be isolated in various applications even to the outside, which requires assembly time and thus costs.
  • the housing has a receiving space for the first switching mechanism and a separate receiving space for the second switching mechanism and each receiving space is bounded on the one hand by a common electrode and on the other hand by a respective associated electrode.
  • the housing e.g. be provided next to each other two receiving spaces for the switching mechanisms, which extends under the two receiving spaces, the continuous, common electrode, while the two receiving spaces are closed at the top by a separate electrode.
  • the housing could contain two through holes, which are closed at the bottom by a common sheet metal part, which serves as a center connection. In each hole, a derailleur is then inserted, the holes are then closed by separate sheet metal parts, which each form the other two external terminals. This results in a device with small external dimensions.
  • each rear derailleur can be configured as an opener or as a closer as needed.
  • the two derailleurs can have different switching temperatures, which is achieved by the design of the respective bimetallic switching element in the derailleur.
  • the deraille can each consist in the simplest case of a bimetal snap-action disc or a bimetal tongue.
  • the structure of the new device which comprises only a housing and two derailleurs, is very simple and has small dimensions. Compared with the use of two separate switches, on the one hand the lower material usage is advantageous, only one housing and three instead of four external connections are required. With the three external connections continues to be accompanied by the advantage of a simpler wiring, since when mounting the device according to the invention on the device to be protected only three instead of four connections must be connected.
  • the center connection can not be contacted from the outside. This is useful if the device is to conduct only in a temperature range. A derailleur is then a closer, which closes upon reaching the lower temperature of the range, while the other derailleur is an opener, which opens at the upper limit of the temperature range and thus interrupts the conductive connection between the two outer terminals again.
  • the cost of manufacturing the new device are low, not only because of the simple construction and low cost of materials compared with the prior art, another advantage is that only one housing must be made and equipped with rear deraille, so that the number the manufacturing steps compared to the prior art significantly reduced.
  • each derailleur comprises a bimetallic snap disk and preferably a working against the bimetallic snap disk spring washer which carries a movable contact.
  • the housing is made of insulating material and for each switching mechanism associated with the associated external terminal, associated electrode and a two switching mechanisms common electrode is provided, which is connected to the center connection.
  • the two receiving spaces are arranged on opposite sides of the common electrode, wherein the two receiving spaces are preferably each closed by an associated electrode, which is each formed as a lid and after inserting the switching mechanism in the receiving space on a Edge of the housing was attached.
  • the associated electrode rests in each case on an inner shoulder of the housing, wherein the edge of the housing is preferably hot-stamped or welded after inserting the electrode.
  • the simple positioning of the electrode acting as a cover of advantage, being achieved by hot stamping or heat welding to the other a much better hold this cover to the housing, as would be the case, for example by locking lugs.
  • the electrode is electrically insulated upwards by the overhanging edge over the electrode, since the housing rests with its edge on one surface and not with the electrode, while on the other hand, the recorded derailleur is particularly well sealed against external influences by the hot stamping or heat sealing ,
  • the common electrode preferably approximately centrally in the housing, is held captive by casting or encapsulation in the manufacture of the housing in such a way that it is an integral part of the housing.
  • the housing is now e.g. can be made as a plastic injection molded part, wherein the common electrode is molded directly during the injection process, so that it becomes an integral part of the housing.
  • the common electrode can serve as a support for the housing to give it a higher stability.
  • the common electrode is formed on both sides of a trained as an inwardly projecting ring part of the housing on which are supported in a switch position, the bimetallic snap disk and / or the spring washer with its respective edge, wherein the bimetal -Screw and / or the spring washer preferably supported in the other switching position with its edge on the associated electrode.
  • the ring fulfills two functions, on the one hand he holds the common electrode and on the other he serves as an insulating support for the edge of bimetallic snap disk and / or spring washer in one switching position.
  • the spring washer In the other switching position, for example, the spring washer is supported with its edge inside of the associated electrode, while pressing the movable contact against the common electrode, so that an electric
  • This insulating support surface could e.g. may be formed by an inside provided on the associated electrode insulating, but also here a projecting ring of the housing can serve as an insulating support surface.
  • the ring provided anyway for holding the common electrode serves as an insulating support surface, for which purpose it is only necessary to insert the bimetallic switching mechanism, as it were, overhead into the receiving space.
  • the common electrode has an integrally formed, protruding from the housing extension, which serves as a center terminal, preferably each associated electrode au an utilizaton, laterally projecting over the housing extension irrit, which serves as an external terminal, and further preferably each electrode a disk-like trained Sheet metal stamping is, on which the extension is integrally formed.
  • This measure is structurally advantageous, by attaching the center electrode and the two outer electrodes is formed by the respective extension, so to speak in the same operation and the external terminal.
  • This extension can be designed as Lötfahne, Lucassteckschuh etc. If this sheet metal stampings are used, the manufacturing costs are very small, so that this also further contributes to reducing the manufacturing and manufacturing costs of the new device.
  • Fig. 1 is shown schematically at 10, a new device for protecting a device indicated at 11.
  • the device 10 comprises a first temperature-dependent switching mechanism 12 and a second temperature-dependent switching mechanism 13 which is connected in series with the first temperature-dependent switching mechanism 12.
  • a two rear derailleur 12 and 13 common center connection is indicated, while 16 is a first derailleur 12 associated with the first outer terminal or 17 an indicated second outer terminal.
  • Both derailleurs 12, 13 are designed as openers, wherein the switching mechanism 12 switches at a temperature T 1 , which is much greater than the temperature T 1 , at which the second switching mechanism 13 opens.
  • the series connection of the two switching mechanisms 12, 13 is connected to a supply voltage 18, while the device to be protected 11 is connected between the second external terminal 17 and ground.
  • a protection device 19 e.g. a heating resistor, a current limiting circuit, etc. may be.
  • the switching mechanism 13 opens, and the immediate supply of the device 11 by the supply voltage 18 is interrupted. However, the device 11 now draws its supply current through the protection device 19, which can for example ensure that only a maximum allowable current flows.
  • the protection device 19 is designed as a heating resistor, it can, for example, exercise a self-holding function, so hold the temperature inside the device 10 by the generated ohmic heat so high that the rear derailleur 13 can not close again. The resistance may also be such that the device 10 cools down again only very slowly, so that a certain switch-on delay for the switching mechanism 13 is realized.
  • the device 19 can be dispensed with, no center connection 15 is required.
  • the device 11 is then off when the temperature T 2 is exceeded and turned on again when cooled below T 2 .
  • the derailleur 12 may be designed so that it closes again only at temperatures well below room temperature, which can be achieved by a corresponding hysteresis of the temperature-determining bimetallic switching part.
  • FIG. 1 The arrangement of FIG. 1 is thus taken to ensure that the device 11 is protected or turned off when reaching a temperature T 2 from excessive power consumption or the like, but after a certain switch-on delay can turn on again, such as electrical Hair dryers is known. Only when a harmful temperature T 1 is exceeded, the new device 10 interrupts the supply of the device 11 completely. External measures, eg the use of cold spray, are now required to make the device 10 operational again.
  • the new device 10 is also shown, which protects a device 11, but now with the first external terminal 16 is connected while the supply voltage is supplied via the center terminal 15.
  • the protection device 19 is now connected between the second external terminal 17 and ground.
  • the rear derailleur 12 is configured again as an opener with a response temperature T 1
  • the rear derailleur 13 is now a closer with a response temperature T 2 , which is significantly lower than the response temperature T first
  • the protective device 19 is actuated by the switching mechanism 13, which may be, for example, a fan, which cools the device 11. Nevertheless, should the temperature of the device 11 continue to increase and finally exceed the value T 1 , the switching mechanism 12 opens, and the connection of the device 11 to the supply voltage 18 is interrupted. Again, the switching hysteresis of the switching mechanism 12 can be selected again so that it does not close again at room temperature.
  • the switching mechanisms 12 and 13 perform completely independent functions for the protection of the device 11, wherein two connections of the switching mechanisms 12, 13 are combined to form a common center port 15 by the selected type of wiring can, without this limits the universal use of the new device 10. It should also be noted that the two switching mechanisms 12, 13 can be designed independently of each other as an opener or closer, wherein the switching temperatures of the two switching mechanisms 12, 13 can also be set independently.
  • the device 10 comprises first a housing 21 made of insulating material, in the indicated at 22 mirror plane an overmolded electrode 23 is provided, which is associated with the center port 15. Upwardly, the housing 21 is closed by an upper cover electrode 24 associated with the first outer terminal 16 and held by a projecting edge 25 of the housing 21 which has been deformed by hot stamping or heat sealing.
  • a lower cover electrode 26 which is associated with the second outer terminal 17 and is held in a corresponding manner by an edge 27.
  • the overmolded electrode 23 is held by an inwardly projecting ring 28 integrally formed with the housing 21, which divides a bore 21 penetrating the housing into an upper receiving space 29 for the rear derailleur 12 and a receiving space 30 for the rear derailleur 13 ,
  • the derailleur 13 includes a spring washer 31 which is supported in the switching position shown with its edge 32 inside of the lower cover electrode 26 and a movable contact 33 carries, by a bimetal snap-action disc 34, which with its edge 35 on the ring 28th supported, is pushed away from the overmolded electrode 23.
  • the derailleur 12 comprises a spring washer 36 which is supported with its edge 37 inside of the upper cover electrode 24 and carries a movable contact 38, which presses against the overmolded electrode 23. About the contact 38, a bimetallic snap disk 39 is slipped, the edge 40 is unloaded in the switching position shown.
  • the upper lid electrode 24 rests on an inner circumferential shoulder 41 of the housing 21, while the lower lid electrode 26 rests on a corresponding shoulder 42 to which it is forced by the rim 27.
  • the device 10 is hermetically sealed, so that in the receiving spaces 29 and 30 neither dirt nor moisture can penetrate.
  • the center port 15 is connected by the spring washer 36 with the first external terminal 16, while between the center terminal 15 and the second external terminal 27, there is no electrically conductive connection, since the bimetallic snap disk 34, the movable contact 36 of the overmolded electrode 34th pushes away because she is in her high temperature position.
  • the bimetallic snap disk 39 would jump from the convex shown in a concave shape and thereby push away the movable contact 38 of the over-molded electrode 23, for which they would be supported with its edge 40 on the ring 28, so that it is isolated from the electrode 23.
  • the device shown in Fig. 3 thus comprises two acting as an opener switching mechanisms 12, 13, it thus corresponds to the device shown in Fig. 1, wherein a temperature greater than T 2 and less than T 1 prevails.
  • the bimetallic snap disk 34 is still in its low temperature position, so that the switching mechanism 13 is formed as a closer.
  • the device 10 of FIG. 3 would correspond to the constellation shown in FIG. 2 at a temperature below T 2 .
  • Fig. 4 is still a plan view of the new device 10 is shown, from which it can be seen that the cover electrode 24 is formed as a disc 43 having an integrally formed extension 44, which serves as a first external terminal 16. At 45, the outline of the disc 43 is indicated. In the disc 43, an opening 46 is provided, through which a rivet-like projection 47 extends in the manner of a latching lug.
  • an extension 48 can be seen further down in Fig. 4, which is integrally formed with the lower cover electrode 26, which is otherwise not visible in Fig. 4.
  • the overmolded electrode 23 is also formed as a disc 51 with an extension 52 which serves as the center terminal 15.
  • the outline of the disc 51 which partially coincides with the outline 45, is indicated at 53.
  • each webs 55 extend, which are also indicated in Fig. 3.
  • the stepped bore is still indicated, which forms the receiving space 29 for the rear derailleur 12, wherein at 57, the inner edge of the ring 28 can be seen.
  • the movable contact 33 is still indicated, which is provided with a collar 58.
  • the overmolded electrode 23 and the two cover electrodes 24, 26 are punched integrally with their extensions 52 and 44 and 48 made of sheet metal, wherein they are simultaneously brought into the shape shown.
  • the two switching mechanisms 12, 13 are inserted so to speak overhead in the receiving spaces 29, 30, so that they assign to the overmolded electrode 23 with the respective movable contact 33, 38.
  • the cover electrodes 24, 26 are placed, being aligned by the respective projection 47 and the still upstanding edge 25 and 27, respectively.
  • the edges 25 and 27 hot-stamped or hot-welded, whereby the production is terminated.
  • the new device 10 which nevertheless comprises two independently operable and to be used derailleurs 12, 13 and shows a very low height, which at 4.5 mm lies.
EP97117930A 1997-02-07 1997-10-16 Vorrichtung zum Schützen eines Gerätes Expired - Lifetime EP0858091B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE19704563 1997-02-07
DE19704563A DE19704563B4 (de) 1997-02-07 1997-02-07 Vorrichtung zum Schützen eines Gerätes

Publications (3)

Publication Number Publication Date
EP0858091A2 EP0858091A2 (de) 1998-08-12
EP0858091A3 EP0858091A3 (de) 1999-05-26
EP0858091B1 true EP0858091B1 (de) 2006-10-11

Family

ID=7819530

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97117930A Expired - Lifetime EP0858091B1 (de) 1997-02-07 1997-10-16 Vorrichtung zum Schützen eines Gerätes

Country Status (4)

Country Link
US (1) US5905620A (un)
EP (1) EP0858091B1 (un)
AT (1) ATE342576T1 (un)
DE (2) DE19704563B4 (un)

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19938638C2 (de) * 1999-08-14 2003-04-24 Thermik Geraetebau Gmbh Übertemperaturschutzvorrichtung
DE10260149A1 (de) * 2002-12-20 2004-07-01 BSH Bosch und Siemens Hausgeräte GmbH Vorrichtung zur Bestimmung des Leitwertes von Wäsche, Wäschetrockner und Verfahren zur Verhinderung von Schichtbildung auf Elektroden
DE10301803B4 (de) * 2003-01-20 2010-12-09 Hofsaess, Marcel P. Schalter mit einem temperaturabhängigen Schaltwerk
DE10325761A1 (de) 2003-06-05 2004-12-23 Behr Gmbh & Co. Kg Vorwiderstandsbaugruppe für einen Elektromotor und Schaltungsanordnung mit ein er Vorwiderstandsbaugruppe zum Betreiben eines Elektromotors sowie Verwendung einer Vorwiderstandsbaugruppe
CN100446148C (zh) * 2005-11-07 2008-12-24 徐佳义 手动复位温控器
US20080169897A1 (en) * 2007-01-17 2008-07-17 Yu-Kang Yang Temperature switch
EP1983319A1 (de) * 2007-04-20 2008-10-22 Siemens Aktiengesellschaft Temperaturerfassungsvorrichtung
EP2159812A1 (en) 2008-08-25 2010-03-03 SANYO Electric Co., Ltd. Over current protection device
JP5274155B2 (ja) * 2008-08-25 2013-08-28 三洋電機株式会社 過電流保護装置
CN102721146A (zh) * 2012-07-03 2012-10-10 海信科龙电器股份有限公司 一种空调电控器
DE102012112487A1 (de) 2012-12-18 2014-06-18 Thermik Gerätebau GmbH Temperaturschutzschaltung

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
LU31325A1 (un) * 1951-04-10
DE1745290U (de) * 1956-09-29 1957-05-23 Siemens Ag Thermostat mit mehreren schaltstellungen als thermischer ueberlastungsschutz fuer maschinenwicklungen.
US3487062A (en) * 1966-11-16 1969-12-30 Du Pont Synergistic accelerator for t-butyl permaleic acid in methacrylate polymerization
US4414524A (en) * 1981-12-07 1983-11-08 Texas Instruments Incorporated Thermally responsive switch
FR2606929B1 (fr) * 1986-11-14 1989-02-10 Telemecanique Electrique Dispositif interrupteur pour appareil de protection
DE8806648U1 (un) * 1988-05-20 1989-06-22 Hofsaess, Peter, 7530 Pforzheim, De
DE4428226C1 (de) * 1994-08-10 1995-10-12 Thermik Geraetebau Gmbh Temperaturwächter
US5708553A (en) * 1996-07-18 1998-01-13 Hung; Je Automatic switching-off structure for protecting electronic device from burning

Also Published As

Publication number Publication date
US5905620A (en) 1999-05-18
DE19704563B4 (de) 2005-07-21
DE19704563A1 (de) 1998-08-13
EP0858091A3 (de) 1999-05-26
ATE342576T1 (de) 2006-11-15
EP0858091A2 (de) 1998-08-12
DE59712747D1 (de) 2006-11-23

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