EP2541571A1 - Commutateur à verrouillage thermodépendant - Google Patents

Commutateur à verrouillage thermodépendant Download PDF

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Publication number
EP2541571A1
EP2541571A1 EP12171748A EP12171748A EP2541571A1 EP 2541571 A1 EP2541571 A1 EP 2541571A1 EP 12171748 A EP12171748 A EP 12171748A EP 12171748 A EP12171748 A EP 12171748A EP 2541571 A1 EP2541571 A1 EP 2541571A1
Authority
EP
European Patent Office
Prior art keywords
housing
switch
temperature
switch according
resistance
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP12171748A
Other languages
German (de)
English (en)
Inventor
Klaus Köthe
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 EP2541571A1 publication Critical patent/EP2541571A1/fr
Withdrawn legal-status Critical Current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
    • H01H37/52—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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/50—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position
    • H01H1/504—Means for increasing contact pressure, preventing vibration of contacts, holding contacts together after engagement, or biasing contacts to the open position by thermal means

Definitions

  • the present invention relates to a self-holding temperature-dependent switch, comprising a housing having a first housing part and a first housing part occlusive second housing part, wherein in the housing, a temperature-dependent switching mechanism is arranged, depending on its temperature, an electrically conductive connection between a the first housing part and an outer terminal disposed on the second housing part, wherein externally to the housing, an electrical resistance part is arranged, which is electrically connected with its first terminal electrically connected to a first of the two outer terminals and with its second terminal electrically connected to a second of the two outer terminals ,
  • the known temperature-dependent switch comprises a lower housing part made of electrically conductive material, in which a temperature-dependent switching mechanism is inserted, which has a bimetallic snap disk and a spring snap-action disc.
  • the derailleur carries centrally a movable contact part, which cooperates with a stationary contact part, which is arranged on an electrically insulating housing upper part, through which the lower housing part is closed.
  • the spring snap disc is supported with its edge inside of the lower housing part and presses the movable contact part against the stationary contact part. In this way, there is an electrically conductive connection between the lower housing part and the stationary contact part on the upper housing part.
  • the temperature of the switching mechanism now increases beyond the response temperature of the bimetallic snap disk, it lifts against the force of the spring snap disk, the movable contact part of the stationary contact part and thus opens the temperature-dependent switch.
  • the bimetallic snap disk snaps back to its cryogenic temperature and the spring snap-action disc can again bring the movable contact part into contact with the stationary contact part, so that the switch is closed again.
  • the known switch like many other such temperature dependent switches, is used to protect an electrical device from overheating.
  • the known temperature-dependent switch is electrically connected in series in the electrical supply circuit of the electrical device to be protected, so that the supply current of the electrical device flows through the temperature-dependent switch.
  • the temperature-dependent switch is thermally coupled to the device to be electrically protected, so that it - possibly with a certain delay - follows the changes in the temperature of the electrical device to be protected.
  • the cooling of the electrical device also leads to a cooling of the temperature-dependent switch so that it closes again and supplies the device with electrical power.
  • Such temperature-dependent switches are common, for example, in electric hair dryer, which turn off when overheating and are immediately reusable after cooling.
  • the electrical device If, on the other hand, the electrical device has to be actively switched off, the user is informed that there is a fault and, for example, he can clean the drain pump.
  • the above-mentioned temperature-dependent switch is equipped for such functions, which is why it is provided with a so-called resistance part, which is arranged electrically parallel to the two outer terminals of the switch. As long as the temperature-dependent switch is closed, the switching mechanism bypasses this also called self-holding resistor resistor part, so that this has no effect on the operating current of the protected electrical equipment.
  • the resistance of the self-holding resistor is chosen so large that only a very small residual current in the protected electrical appliance flies, on the one hand does not lead to further damage to the electrical device, but on the other hand can heat up the self-holding resistor so far that the temperature-dependent switching mechanism on a Temperature can be maintained, which is above the return temperature.
  • temperature-dependent switch remains open until the circuit is interrupted.
  • temperature-dependent switches are also referred to as self-holding switches.
  • the resistance part is a substrate provided with a resistance paste to which lead terminals are attached.
  • a coupling ring is provided, which is plugged from below onto the lower housing part and thus comes into electrical contact with this.
  • the coupling ring has on its underside a plate with retaining tabs, in which the resistance part is held on the retaining plate.
  • the resistance part is electrically connected via the retaining tabs and the coupling ring with the housing base, while the other terminal to be connected in a manner not shown via a strand to the stationary contact part.
  • the resistance part is to be arranged at the top in the region of the stationary contact part and fastened to the housing via a connection bracket.
  • connection of the components ie the contacting of the substrate by a combination of clamping / riveting and soldering connections in SMD technology should be done.
  • the resistance part is arranged with the help of the coupling ring down to the bottom of the known switch, it hinders the thermal connection to the electrical device to be protected, because this thermal connection is made only through the intermediate plate.
  • the thermal connection of the resistance part to the temperature-dependent switching mechanism is insufficient, because the heat generated in the resistance part, which is to be used for latching, must pass through the insulating cover into the interior of the temperature-dependent switch.
  • an open self-holding temperature-dependent switch in which an insulating support member, a first terminal lug is arranged, which is connected to a bimetallic spring, and a second terminal lug, which is connected to a fixed contact part, with which the free end of the bimetal.
  • Spring interacts. On the bimetallic spring is a resistance element which is held by an electrically conductive clip which rests with its one leg on the resistance element and with its other leg on the second terminal lug.
  • the resistance element is connected in parallel to the first and the second terminal lug and acts as a self-holding resistor.
  • the present invention seeks to provide a temperature-dependent switch of the type mentioned, which is easy to assemble and structurally simple and avoids the disadvantages of known switch.
  • this object is achieved according to the invention in that the resistance part is at its first connection in a preferably planar contact with an electrically conductive clamp, via which the resistance part is held on the housing and at the same time electrically connected to the first external connection.
  • the inventors of the present application have recognized that the resistance part can be connected by pure clamping technology with the temperature-dependent switch, wherein the electrically conductive clip also serves for the thermal connection of the thus formed, self-holding switch to the electrical device to be protected.
  • the first terminal surface comes into contact with the clip, which is in a manner to be described for the electrical contacting advantage.
  • the resistance part rests with its second connection preferably flat on an electrode connected to the second external connection.
  • the contacting takes place on the second connection by mechanical contact, soldering, welding or similar connection measures can therefore be dispensed with according to the invention.
  • the electrical contacting between the resistance part and the switch preferably also takes place at the second connection via a flat contact, so that the heat developed in the resistance part is well introduced into the interior of the temperature-dependent switch, so that even a small heat development of the resistance part is sufficient to keep the temperature-dependent derailleur at a temperature that is above the return temperature.
  • the resistance part with its one connection now directly and preferably flat on a connected to the corresponding outer terminal of the housing electrode, so that here both the electrical and the thermal connection is optimal.
  • the inventors of the present application have further recognized that it is sufficient for the electrical connection of a self-holding resistor, if the contacts are made purely by mechanical clamping, which is advantageous if the system is flat.
  • flat contact is understood to mean the installation of two flat parts, that is to say straight no point or line contact with arched, elongated or pointed components.
  • advantages of the invention can also be realized by rather point or line-shaped contacts. It is important above all that the electrical contact is ensured in particular by mechanical pressure and not by material-locking connections.
  • the resistance part has a PTC characteristic, ie with increasing heating has an increasing resistance, so to speak counteracts the increasing heating by reducing the current flow, it is namely not necessary that the contact resistance between the resistance part and the external terminals so low are, as is possible by soldering or welding connections.
  • the resistance value of a self-holding resistor is typically in the range of several kilo-ohms, and because of the positive temperature characteristic, the thermal output is approximately identical for a voltage drop in the range of 90 to 250 volts across the resistor portion.
  • the inventors of the present application have thus recognized that the quality of the contact resistances in the just-described terminal contact is sufficient to provide sufficient heating of the temperature-dependent switching mechanism via the resistance part, so that the latter remains at a temperature above the return temperature until the Circuit is actually interrupted.
  • the housing has a closed by an electrically conductive cover electrode housing lower part of electrically insulating material, and the resistance part rests with its second terminal on the cover electrode, wherein further preferably in the lower housing part, a bottom electrode is arranged, through an opening in the lower housing part is electrically connected to the bracket.
  • the advantage here is that a mechanically simple constructed temperature-dependent switch can be provided in a technically simple manner subsequently with a self-holding function.
  • the clamp is U-shaped with a bottom and two approximately perpendicular side walls, wherein the housing is held by the side walls and the resistance part between the bottom and the housing is clamped, preferably at least one of the side walls, a holding portion is provided which extends approximately parallel to the bottom of the bracket and bears against the bottom of the housing, wherein more preferably on the holding portion, a hook is provided, which projects into the bottom of the housing.
  • the one-piece U-shaped bracket engages around the assembly of housing and resistance part such that the finished self-holding switch is easy to assemble and held together purely by the spring force of the clip. At the same time, the electrical parallel connection of the resistance part to the external connections takes place.
  • beads are provided for fixing the resistance part in the bottom of the clip, wherein more preferably a tab for fixing the housing is provided on the holding portions, wherein preferably the clip is made of resilient material.
  • the resistance part has an electrical resistance with PTC characteristic.
  • Fig. 1 is shown in a schematic side view and cut a temperature-dependent switch 10 ', which is not yet equipped with a self-holding function.
  • the switch 10 ' has a housing 11 in which a temperature-dependent switching mechanism 12 is arranged.
  • the housing 11 comprises a housing lower part 14, which is closed by an upper housing part 13 and made of electrically insulating material, at the bottom of which a flat bottom electrode 15 which is partially overmolded by the material of the housing lower part 14 is arranged, which has a center in the middle which serves as a stationary contact part 16.
  • the upper housing part 13 is formed by an electrically conductive cover electrode 17.
  • the temperature-dependent rear derailleur 12 comprises, in a manner known per se, a spring snap-action disc 18, which carries a movable contact part 19, which in the in Fig. 1 shown switching position in contact with the stationary contact part 16.
  • a bimetal snap-action disc 21 is arranged freely.
  • the spring snap-action disc 18 is supported by its edge 22 on the cover electrode 17, so that it produces an electrically conductive connection between the cover electrode 17 and the bottom electrode 15 in the housing lower part 14.
  • the outer contact of the switch 10 'from Fig. 1 takes place on the side of the housing 11 protruding external terminals 26, 27, which are integrally formed with the bottom electrode 15 and the cover electrode 17.
  • the cover electrode 17 is fixed to the lower housing part 14 via a circumferential, hot-pressed edge 28 of the lower housing part 14. In this case, the cover electrode 17 rests on a circumferential shoulder 29 inside in the lower housing part 14.
  • Fig. 2 the switch 10 'is off Fig. 1 shown in a schematic perspective view obliquely from above.
  • the two outer terminals 26, 27 are designed as terminal connections which protrude laterally from the switch 10 '.
  • Fig. 2 It can be seen that the lower housing part 14 with its peripheral edge 28 surrounds the upper housing part 13, that is to say the cover electrode 17, and forms a type of upwardly open, almost circular receiving space 30.
  • Fig. 3 is shown a one-piece, U-shaped bracket 31 made of resilient and electrically conductive material having a bottom 32 and two side walls 33 and 34 which are perpendicular to the bottom 32.
  • the side wall 33 is provided with an angled holding portion 35 which is parallel to the bottom 32.
  • the side wall 34 is also provided with a holding portion 35, which merges into a tab 36, which is also parallel to the Floor 32 runs.
  • the tab 36 is provided with a small hook 37, which is bent back to the bottom 32 and approximately parallel to the side wall 34 extends.
  • the bracket 31 has a length LK and a width BK, which correspond somewhat to the length LS and the width BS of the switch 10, which in Fig. 2 are indicated.
  • Fig. 4 is shown that the switch 10 'off Fig. 2 in the clip Fig. 3 is inserted, this arrangement compared to the Fig. 1 to 3 turned around and again shown in perspective from above.
  • Fig. 4 It can be seen that the tab 36 engages with a projection 37 in an opening 38 in the bottom 39 of the housing lower part 14.
  • This opening 38 is also in Fig. 1 to recognize, it leads directly to the bottom electrode 15, which is thus partially free in the opening 38. In this way, the tab 36 abuts against the bottom electrode 15 and is electrically connected to the bottom electrode 15 and thus to the external terminal 26.
  • a further tab 40 is arranged, which is bent back onto the bottom 32 and extends transversely to the side wall 33, so that is held by the switch 10 'laterally immovable in the bracket 31.
  • a resistance part 41 in the form of a cylindrical PTC module 42 is inserted.
  • the resistance part 41 has a lower port 43 and an upper port 44 each formed by the round end face of the cylinder.
  • the PTC module 42 is electrically connected to the bottom 32 of the clamp 31 by its flat connection 43, while it is seated with its upper connection 44 in the receiving space 30 and electrically connected to the cover electrode by planar mechanical contact 17 is connected.
  • the PTC module is defined by the edge 28 and two only in Fig. 3 to be recognized beads 45 mechanically fixed in the bottom 32 of the bracket 31.
  • the assembly of the new switch is extremely simple.
  • the clip 31 is still required, in the first case, the housing 11 is inserted.
  • the housing 11 is already prefixed by the hooks 37 and the tab 40 in the bracket 31.
  • the clip 31 serves not only the mechanical support of the resistance part 41 on the switch 10, it also leads simultaneously to an electrical parallel connection of the resistance part 41 to the temperature-dependent switch 10th
  • the resistance part 41 is now electrically connected with its lower terminal 43 to the bottom electrode 15 and consequently to the outer terminal 26. With its upper terminal 44, the resistance part 41 abuts directly on the cover electrode 15, that is, it is electrically connected to the second outer terminal 27.
  • the resistance part 41 is electrically parallel to the two outer terminals 26 and 27, wherein the electrical contact is made by the clamping force of the clip 31, further connection measures are not required.
  • switch 10 instead of the switch 10 according to Fig. 1 to use a switch in which the upper housing part 13 and the lower housing part 14 are made of electrically conductive material, as it is realized for example in the switch, which in the DE 21 21 802 A1 is described.
  • This switch also has a temperature-dependent switching mechanism, which produces an electrically conductive connection between the electrically conductive upper part and the electrically conductive lower part.
  • Upper housing part and lower housing part are electrically separated from each other by an insulating film.
  • bracket 31 off Fig. 3 can now also the resistance part 41 mounted on such a switch, wherein for contacting and mechanical support in the bottom of this switch, an opening may be provided, into which the hook 37 of the tab 36 engages.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
EP12171748A 2011-06-28 2012-06-13 Commutateur à verrouillage thermodépendant Withdrawn EP2541571A1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110108660 DE102011108660B3 (de) 2011-06-28 2011-06-28 Selbsthaltender temperaturabhängiger Schalter

Publications (1)

Publication Number Publication Date
EP2541571A1 true EP2541571A1 (fr) 2013-01-02

Family

ID=46354012

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12171748A Withdrawn EP2541571A1 (fr) 2011-06-28 2012-06-13 Commutateur à verrouillage thermodépendant

Country Status (3)

Country Link
EP (1) EP2541571A1 (fr)
CN (1) CN102856117A (fr)
DE (1) DE102011108660B3 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018033532A1 (fr) 2016-08-16 2018-02-22 Abb Schweiz Ag Protection d'un transformateur comprenant un changeur de prise

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN104102243A (zh) * 2013-04-11 2014-10-15 中国科学院寒区旱区环境与工程研究所 一种风光互补仪器保温箱
CN109801811A (zh) * 2019-03-19 2019-05-24 广州安的电子技术有限公司 温度开关
DE102022120447B3 (de) * 2022-08-12 2023-11-30 Marcel P. HOFSAESS Temperaturabhängiger Schalter

Citations (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2121802A1 (de) 1971-05-03 1973-01-25 Thermik Geraetebau Gmbh Temperaturwaechter
DD119497A1 (fr) 1975-05-24 1976-04-20
DE4142716A1 (de) 1991-12-21 1993-06-24 Microtherm Gmbh Thermoschalter
EP0794546A2 (fr) * 1996-03-09 1997-09-10 Thermik Gerätebau GmbH Interrupteur avec un mécanisme de commutation sensible à la température
EP1538652A2 (fr) * 2003-12-03 2005-06-08 Texas Instruments Incorporated Dispositif à faible courant de protection de moteurs électriques
DE202008017439U1 (de) * 2008-07-02 2009-08-27 Tmc Sensortechnik Gmbh Temperaturabhängiger Schalter
US7800477B1 (en) * 2007-03-20 2010-09-21 Thermtrol Corporation Thermal protector

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009039948A1 (de) * 2009-08-27 2011-03-03 Hofsaess, Marcel P. Temperaturabhängiger Schalter

Patent Citations (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2121802A1 (de) 1971-05-03 1973-01-25 Thermik Geraetebau Gmbh Temperaturwaechter
DD119497A1 (fr) 1975-05-24 1976-04-20
DE4142716A1 (de) 1991-12-21 1993-06-24 Microtherm Gmbh Thermoschalter
EP0794546A2 (fr) * 1996-03-09 1997-09-10 Thermik Gerätebau GmbH Interrupteur avec un mécanisme de commutation sensible à la température
DE19609310A1 (de) 1996-03-09 1997-09-11 Thermik Geraetebau Gmbh Schalter mit einem temperaturabhängigen Schaltwerk
EP1538652A2 (fr) * 2003-12-03 2005-06-08 Texas Instruments Incorporated Dispositif à faible courant de protection de moteurs électriques
US7800477B1 (en) * 2007-03-20 2010-09-21 Thermtrol Corporation Thermal protector
DE202008017439U1 (de) * 2008-07-02 2009-08-27 Tmc Sensortechnik Gmbh Temperaturabhängiger Schalter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2018033532A1 (fr) 2016-08-16 2018-02-22 Abb Schweiz Ag Protection d'un transformateur comprenant un changeur de prise

Also Published As

Publication number Publication date
DE102011108660B3 (de) 2012-11-22
CN102856117A (zh) 2013-01-02

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