EP2048683A1 - Schalter mit temperaturabhängigem Schaltmechanismus - Google Patents

Schalter mit temperaturabhängigem Schaltmechanismus Download PDF

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Publication number
EP2048683A1
EP2048683A1 EP08016674A EP08016674A EP2048683A1 EP 2048683 A1 EP2048683 A1 EP 2048683A1 EP 08016674 A EP08016674 A EP 08016674A EP 08016674 A EP08016674 A EP 08016674A EP 2048683 A1 EP2048683 A1 EP 2048683A1
Authority
EP
European Patent Office
Prior art keywords
disc
bimetallic snap
switch
switching mechanism
contact
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
Application number
EP08016674A
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English (en)
French (fr)
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EP2048683B1 (de
Inventor
Marcel P. Hofsaess
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Individual
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Individual
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Publication of EP2048683A1 publication Critical patent/EP2048683A1/de
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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

Definitions

  • the present invention relates to a switch having a housing which houses a temperature-dependent switching mechanism and on which a first and a second counter-contact for the switching mechanism are arranged, with the switching mechanism comprising an electrically conductive spring part which carries a movable contact part and a bimetallic snap-action disc, which bimetallic snap-action disc is unrestricted below its response temperature, with the spring part making an electrically conductive connection via the contact part between the two counter-contacts when the switching mechanism is below the response temperature.
  • a switch such as this is known from DE 37 10 672 A1 .
  • the housing has a lower part, which is manufactured from electrically conductive material, and a cover part, which closes off the lower part and is manufactured from insulating material.
  • the switching mechanism is arranged within this housing and, as a spring part, has a spring disc which is fitted with a movable contact part.
  • the spring disc acts against a bimetallic snap-action disc which is placed over the movable contact part.
  • the spring disc which is supported on the base of the lower part, presses the movable contact part against a first counter-contact, which is provided internally on the cover part, and extends upwards in the form of a rivet through the cover.
  • the base of the lower part is used as a second counter-contact for the switching mechanism.
  • the spring disc Since the spring disc is itself manufactured from electrically conductive material, it ensures, below the response temperature of the switching mechanism, that there is a low-impedance, electrically conductive connection between the counter-contact on the cover part and the counter-contact on the lower part, with contact being made with the lower part from the outside. If the temperature of the switching mechanism is now increased, then the bimetallic snap-action disc snaps over suddenly and presses the movable contact part away from the counter-contact on the cover, against the force of the spring disc, thus interrupting the electrical connection.
  • DE 21 21 802 A1 discloses a further switch of this generic type, in whose housing a temperature-dependent switching mechanism as described above is likewise arranged.
  • the cover part and lower part are both in the form of pots, and are manufactured from electrically conductive material.
  • An insulating film is arranged between the upper part and the lower part in order to electrically isolate the two housing parts from one another.
  • the temperature-dependent switching mechanism now on the one hand makes contact with the lower part via the edge of the spring disc and on the other hand makes contact with the cover part via the movable contact part, thus resulting in an electrically conductive connection between the cover part and the lower part as long as the temperature of the switching mechanism is below the response temperature. If the temperature of the switching mechanism increases, then this electrical connection is interrupted in the manner described above.
  • a switch of this generic type which is known from EP 0 858 090 A2 comprises a two-part housing composed of insulating material, into which a temperature-dependent switching mechanism is inserted.
  • the switching mechanism comprises a spring disc which is fitted approximately centrally with a movable contact on which a bimetallic snap-action disc is arranged.
  • the movable contact part interacts with a fixed first counter-contact, which is provided as a cover electrode internally on the cover part of the housing.
  • a holding attachment is provided at the side on the spring disc and is mounted by means of a pin on a basis electrode, which is provided on the lower part of the housing and acts as a second counter-contact.
  • the base electrode and the cover electrode in this case each have an external connection into which the stripped end of a connecting wire is inserted.
  • the movable contact part rests on the fixed first counter-contact such that an electrically conductive connection between the two external connections is made in this case as well via the fixed first counter-contact, the movable contact part, the spring disc, the holding attachment and the second counter-contact.
  • the bimetallic snap-action disc If the temperature of the bimetallic snap-action disc increases above its response temperature, then it snaps over from its convex shape to a concave shape in which its edge is supported on shoulders and stops provided for this purpose in the upper housing part, and in which case it lifts off the movable contact part from the fixed first counter-contact, against the force of the spring disc. To do this, it is necessary for the bimetallic snap-action disc to force the spring disc to change its convex shape into a concave shape.
  • DE 197 27 197 discloses a switch of this generic type in which the spring disc is fitted, as the movable contact part, with a contact link which, below the response temperature of the bimetallic snap-action disc, is pressed by the spring disc against the two counter-contacts, which in this case are arranged alongside one another on the cover of the housing.
  • These switches are designed for a high current flow, but otherwise operate in the same way as the switches discussed above.
  • the temperature-dependent switches and switching mechanisms described so far are used to protect an electrical appliance against excessively high temperature.
  • the supply current for the appliance to be protected is passed through the temperature-dependent switch and the temperature-dependent switching mechanism, with the switch and the switching mechanism being thermally coupled to the appliance to be protected.
  • the respective switching mechanism then opens the circuit at a response temperature which is predetermined by the snap-action temperature of the bimetallic snap-action disc, by the movable contact part being lifted off the fixed counter-contact, or the contact link being lifted off the two counter-contacts.
  • the bimetallic snap-action disc When switches such as these with a loosely inserted bimetallic snap-action disc are used in the field of alternating magnetic fields, then the bimetallic snap-action disc can be caused to vibrate below its response temperature, that is to say when it is located freely in the switch without any mechanical loads, since, by virtue of its composition, it can be magnetized by a magnetic field. In other words, the bimetallic snap-action disc is magnetized by the external magnetic field, and may oscillate as a consequence of this.
  • a further disadvantage is the noise caused by the vibration, which a user often perceives as “chirping”, “humming” or “buzzing".
  • DE 196 36 320 A1 discloses a temperature-dependent switch with a spring tongue which is clamped in at one end and with freely inserted bimetallic strips, wherein a holding or guide part of the spring tongue and/or bimetallic strip is manufactured from magnetic material.
  • the spring tongue is fitted in a manner known per se with a movable contact which makes contact with the fixed contact, with the spring tongue being connected to an external connection at its clamped-in end, and with the fixed contact also being connected to an external connection.
  • the bimetallic strip which is admittedly loosely inserted but guided on its narrow faces, lifts the movable contact off the fixed contact in the event of an unacceptable temperature increase.
  • DE 197 27 383 A1 discloses a switch which in principle is designed in the same way as the switch known from DE 3 710 672 A1 mentioned at the outset.
  • the counter-contact on which the edge of the spring disc is supported below the response temperature is designed to be magnetic.
  • US 3,755,770 discloses a switch having a temperature-dependent switching mechanism, wherein a bimetallic snap-action disc is provided, which bimetallic snap-action disc is clamped in at its rim by inter-position of a damping disc.
  • this document discloses a switch wherein a damping material is directly glued or otherwise bonded to the bimetallic snap-action disc. By this, vibrations of the bi-metallic snap-action disc shall be damped in order to stabilize the response temperature. With both alternatives, the bimetallic snap-action disc is not unrestricted.
  • this object is achieved in that a first damping part is arranged between the bimetallic snap-action disc and the spring part.
  • the first damping part considerably reduces the mechanical loads on the bimetallic snap-action disc on striking against other parts of the switch, thus counteracting shortening of the life and uncontrolled shifting of the switching temperature.
  • the first damping part is arranged between the bimetallic snap-action disc and the spring part, thus damping impacts between the spring part and the bimetallic snap-action disc. This has nothing to do with the shape of the spring part.
  • the bimetallic snap-action disc and spring part are metal parts which, furthermore, are always located very close to one another in the switch. According to the finding of the inventor, even minor vibration of the bimetallic snap-action disc leads to the bimetallic snap-action disc striking the spring part, and the invention now prevents this.
  • bimetallic snap-action discs means essentially round, oval or rectangular discs which are manufactured from at least two different metals and assume a convex shape or concave shape depending on their temperature.
  • a further damping part can be arranged between the bimetallic snap-action disc and the housing, in such a way that impacts between the edge or the centre of the bimetallic snap-action disc and the housing part, for example a contact shoulder or a cover or base of the housing, are also damped.
  • the further damping part can also be formed on a part of the housing with which the bimetallic snap-action disc comes into contact.
  • This part may also be a contact shoulder or a cover or base of the housing.
  • the damping part is formed by corresponding coating or processing of the appropriate housing part.
  • first and/or further damping part is provided in the form of a disc or ring, preferably a film, and furthermore preferably a film in the form of a disc or ring.
  • the damping part is in the form of a component which can be produced easily and can furthermore also be inserted without any problems during final assembly of the new switch.
  • films which are preferably provided according to the invention can be made thin, in such a way that it is possible to entirely or largely avoid further design adaptations to known switches.
  • the film can be inserted into free spaces and intermediate spaces which exist in any case by virtue of the design.
  • the film it is preferable for the film to have an enlarged, preferably corrugated, grooved or honeycomb surface, with the first and/or further damping part furthermore preferably being composed of an elastic material, furthermore preferably plastic, synthetic rubber or rubber.
  • enlarged surface means a surface which is larger than a flat film with the same external dimensions, as can be produced by stamping or embossing on an initially flat film.
  • damping part is designed, by choice of its material and/or its surface, such that the impacts of the bimetallic snap-action disc during its vibration are braked, that is to say damped.
  • 10 denotes a switch in whose housing 11 a temperature-dependent switching mechanism 12 is arranged. Switches such as these are used, for example, for monitoring the temperature of electrically operated appliances, and for this purpose are electrically connected in series with the appliance.
  • the housing 11 comprises a lower part 11, which has a wall 13 and is composed of electrically insulating material, and on whose inner base 15 a first counter-contact 16 for the switching mechanism 12 is arranged.
  • the lower part 14 is closed off by an electrically conductive cover part 17, whose inner face acts as a second counter-contact 19.
  • the first counter-contact 16 is in the form of a disc 21.
  • the housing lower part 14 clasps the edge of the disc 21 in an annular shape, thus resulting in an insulating contact area 22 which also provides insulation in the upward direction for the edge of the disc 21.
  • the disc 21 Approximately centrally, the disc 21 has a contact projection 23, which points into the interior of the housing 11.
  • the second counter-contact 19 is in the form of a disc 24 whose edge 25 is supported on the inner, circumferential shoulder 26 of the lower part 14.
  • a hot-pressed edge 27 of the lower part 14 clasps the edge 25 of the disc 24, holding the disc 24 captive on the shoulder 26.
  • the discs 21 and 24 respectively have a connecting part 28 or 29, which is thus formed integrally, extends at the side through the wall 13 out of the switch 10, and is used as the external connection.
  • the switching mechanism 12 comprises a spring disc 31 which is fitted with a movable contact part 32 which, in the illustrated embodiment, is welded to the spring disc 31.
  • the edge 33 of the spring disc 31 is supported on the disc 24 and, in the lower-temperature position as illustrated in Figure 1 , presses the movable contact part 32 against the contact projection 23, thus resulting overall in an electrical connection being produced between the connecting parts 28 and 29 via the electrically conductive spring disc 31.
  • the bimetallic snap-action disc 34 If the switching mechanism 12 is heated to such an extent that the bimetallic snap-action disc 34 snaps over to its high-temperature position as shown in Figure 2 , the bimetallic snap-action disc is then supported by its edge on the insulating contact area 22, and presses the movable contact part 32 away from the contact projection 23 until, finally, the spring disc 31 finally also snaps open from the illustrated concave shape to a convex shape.
  • the bimetallic snap-action disc 34 is now supported by its edge on the insulating contact area 22, such that any possible contact in the area of the movable contact part 32 on the cover part 17 does not lead to an undesirable short-circuit between the two connecting parts 28 and 29.
  • the switch 10 when it is below the response temperature of the bimetallic snap-action disc as shown in Figure 1 , is subjected to a magnetic alternating field, then the bimetallic snap-action disc 34 which is located loosely in the switch 10 starts to vibrate which, without the intermediate damping film 35 according to the invention, would lead to it mechanically striking the spring disc 31. These impacts would mechanically load the bimetallic snap-action disc 34 and would furthermore be audible as disturbing noise.
  • the bimetallic snap-action disc 34 also strikes the surface 36 of the contact area 22.
  • the surface is provided with a damping net 37, which can be produced by coating with an elastic material or by processing the surface 37 itself.
  • damping film can also be provided on the contact area.
  • the damping film 35 is in the form of a ring or disc and is manufactured from a plastic, from synthetic rubber or from rubber.
  • the damping film 35 has an enlarged surface which is corrugated, grooved or honeycomb, such that it can elastically damp the impacts of the bimetallic snap-action disc 34.
  • the disturbing noise is therefore reduced if not entirely overcome without any disadvantageous effects on the life time of the bimetallic snap-action disc and the long-term stability of the switching temperature. Furthermore, the mechanical loading which is otherwise caused by the vibration is reduced considerably, thus leading to an even better long-term stability of the switching temperature.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Crystals, And After-Treatments Of Crystals (AREA)
  • Switches With Compound Operations (AREA)
  • Switches That Are Operated By Magnetic Or Electric Fields (AREA)
EP08016674A 2007-10-12 2008-09-23 Schalter mit temperaturabhängigem Schaltmechanismus Active EP2048683B1 (de)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE102007050342A DE102007050342B3 (de) 2007-10-12 2007-10-12 Schalter mit einem temperaturabhängigen Schaltwerk

Publications (2)

Publication Number Publication Date
EP2048683A1 true EP2048683A1 (de) 2009-04-15
EP2048683B1 EP2048683B1 (de) 2010-09-15

Family

ID=40260712

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08016674A Active EP2048683B1 (de) 2007-10-12 2008-09-23 Schalter mit temperaturabhängigem Schaltmechanismus

Country Status (4)

Country Link
EP (1) EP2048683B1 (de)
AT (1) ATE481725T1 (de)
DE (2) DE102007050342B3 (de)
DK (1) DK2048683T3 (de)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2511399A (en) * 2012-12-24 2014-09-03 Otter Controls Ltd Controls for heated liquid vessels and electrical appliances

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
US3755770A (en) 1971-12-07 1973-08-28 Gen Electric Thermostat having improved temperature drift control means
US4091354A (en) * 1976-06-03 1978-05-23 Therm-O-Disc Incorporated Bimetal snap disc thermostat arranged to reduce temperature calibration drift
DE3710672A1 (de) 1987-03-31 1988-10-13 Hofsass P Temperaturwaechter mit einem gehaeuse
DE19636320A1 (de) 1995-08-30 1997-03-06 Uchiya Thermostat Überhitzungsschutzeinrichtung
EP0858090A2 (de) 1997-02-11 1998-08-12 Thermik Gerätebau GmbH Temperaturabhängiger Schalter mit einem Bimetall-Schaltwerk
DE19727383A1 (de) 1997-06-27 1999-02-04 Marcel Hofsaes Schalter mit einem temperaturabhängigen Schaltwerk
DE19727197A1 (de) 1997-06-26 1999-02-04 Marcel Hofsaess Temperaturabhängiger Schalter mit Kontaktbrücke

Family Cites Families (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4908596A (en) * 1989-02-17 1990-03-13 Therm-O-Disc, Incorporated Thermostat assembly

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
US3755770A (en) 1971-12-07 1973-08-28 Gen Electric Thermostat having improved temperature drift control means
US4091354A (en) * 1976-06-03 1978-05-23 Therm-O-Disc Incorporated Bimetal snap disc thermostat arranged to reduce temperature calibration drift
DE3710672A1 (de) 1987-03-31 1988-10-13 Hofsass P Temperaturwaechter mit einem gehaeuse
DE19636320A1 (de) 1995-08-30 1997-03-06 Uchiya Thermostat Überhitzungsschutzeinrichtung
EP0858090A2 (de) 1997-02-11 1998-08-12 Thermik Gerätebau GmbH Temperaturabhängiger Schalter mit einem Bimetall-Schaltwerk
DE19727197A1 (de) 1997-06-26 1999-02-04 Marcel Hofsaess Temperaturabhängiger Schalter mit Kontaktbrücke
DE19727383A1 (de) 1997-06-27 1999-02-04 Marcel Hofsaes Schalter mit einem temperaturabhängigen Schaltwerk

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2511399A (en) * 2012-12-24 2014-09-03 Otter Controls Ltd Controls for heated liquid vessels and electrical appliances

Also Published As

Publication number Publication date
ATE481725T1 (de) 2010-10-15
EP2048683B1 (de) 2010-09-15
DE102007050342B3 (de) 2009-04-16
DK2048683T3 (da) 2010-12-20
DE602008002524D1 (de) 2010-10-28

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