EP0453596B1 - Temperaturschalter - Google Patents

Temperaturschalter Download PDF

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Publication number
EP0453596B1
EP0453596B1 EP90107825A EP90107825A EP0453596B1 EP 0453596 B1 EP0453596 B1 EP 0453596B1 EP 90107825 A EP90107825 A EP 90107825A EP 90107825 A EP90107825 A EP 90107825A EP 0453596 B1 EP0453596 B1 EP 0453596B1
Authority
EP
European Patent Office
Prior art keywords
switch according
contact
contact parts
parts
injection moulding
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
EP90107825A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0453596A1 (de
Inventor
Ulrika Hofsäss
Marcel Peter Hofsäss
Denise Petra Hofsäss
Henrik Peter Hofsäss
Carola Rika Hofsäss
Benjamin Michael Hofsäss
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.)
HOFSAESS, BENJAMIN MICHAEL
HOFSAESS, CAROLA RIKA
HOFSAESS, DENISE PETRA
HOFSAESS, HENRIK PETER
HOFSAESS, MARCEL PETER
HOFSAESS, ULRIKA
Original Assignee
Individual
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 Individual filed Critical Individual
Priority to DK90107825.3T priority Critical patent/DK0453596T3/da
Priority to ES90107825T priority patent/ES2071697T3/es
Priority to DE59008766T priority patent/DE59008766D1/de
Priority to AT90107825T priority patent/ATE120303T1/de
Priority to EP90107825A priority patent/EP0453596B1/de
Publication of EP0453596A1 publication Critical patent/EP0453596A1/de
Application granted granted Critical
Publication of EP0453596B1 publication Critical patent/EP0453596B1/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
    • H01H37/02—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
    • 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
    • H01H2037/5463—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting the bimetallic snap element forming part of switched circuit
    • 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
    • H01H37/5418—Thermally-sensitive members actuated due to deflection of bimetallic element wherein the bimetallic element is inherently snap acting using cantilevered bimetallic snap elements

Definitions

  • the invention relates to a temperature switch according to the preamble of claim 1.
  • PTC plates had the advantage that they have a high resistance at the opening temperature of the switch caused by damage to the device to be monitored, so that only a small current flow and little heat generation are possible, while when the device cools the current flow and its heat generation increased, an equilibrium state being set such that the resistance itself can keep the bimetal element in its high temperature position even at low temperatures without the supply of external heat.
  • Conventional ceramic PTC plates are delicate and, in particular, easily fragile so that they can be easily damaged. They are also relatively expensive and their use, in particular their electrical contacting, is complicated.
  • all known bridging resistors must be provided as additional parts in the known switches, since the plates have a necessarily plate-shaped cuboid shape.
  • Such a generic temperature switch is known from DE-OS 21 13 388, in which stationary connection contacts protrude from an opening side into a housing, one of which carries a bimetallic spring with a movable contact, which comes into electrically conductive connection with the stationary counter contact or can open it.
  • the two stationary contact parts are kept at a distance by a ceramic PTC element, with which they are clamped between the walls of the housing, which surrounds all parts, if necessary with the interposition of a spring. Since the housing is a metal housing, at least one of the contact parts is insulated against it by an additional plastic member.
  • a temperature switch which has a support part made of electrically conductive plastic. Stationary connecting parts are connected to this on opposite end faces by eyelets, the clamps or eyelets on the side opposite the connecting parts being mechanically and electrically connected to contact parts present in addition to the connecting parts.
  • a movable contact part protrudes under the stationary counter contact.
  • the invention is therefore based on the object, while avoiding the aforementioned disadvantages, of creating a generic temperature switch which is reliable and inexpensive to manufacture because it can be fully automated.
  • the two stationary contacts are generally provided with parts which isolate one another and which consist of a functionally shaped part which has hitherto generally been selected from Luroplast or other materials.
  • the invention provides to replace these structural parts, which either keep the stationary contact parts at a distance or keep them, for example by enclosing them, are sprayed around them or the like, by an injection molded part made of plastic, which itself is a finite, albeit relative has high resistance, which preferably has a positive temperature coefficient.
  • the corresponding constructive part of the temperature switch as such is replaced by a corresponding part with the finite resistance, which otherwise fulfills the same mechanical-constructive function, so that no additional part is required to form the high-resistance bridge between the stationary contact parts, such as this is the case in the prior art, where these parts must then also be fixed separately to the stationary contact parts and contacted with them.
  • the holding resistance thus formed by the injection molded part therefore causes self-stabilization when the switch contact is open.
  • the high-resistance according to the invention Injection molded part can be produced at substantially the same cost as the part it replaces, so that a self-holding temperature switch can be created without the increased costs incurred in the previously known self-holding temperature switches.
  • An extremely preferred embodiment is characterized in that at least one connecting part for connecting the switch to an external voltage source is extrusion-coated by the injection molded part. This has the advantage of better contact making.
  • Also preferred embodiments of the temperature switch according to the invention are characterized in that at least one of the stationary contact parts is injection molded around and held by the injection molded part and in particular that both stationary contact parts are injection molded around and held by the injection molded part.
  • the injection molded part has a thermoplastic, it being possible in particular to provide that the injection molded part consists of a high-degree of crystallinity, optionally glass-fiber-reinforced, preferably plastic, doped with conductive material.
  • the plastic can preferably be polyphenylene sulfide, oxide, polyethylene or PE compounds or the like.
  • the conductive material can be carbon, such as carbon black, graphite, carbon fibers or a non-oxidizing or poorly oxidizing metal.
  • the molded part can consist of self- or intrinsically conductive polymer, such as polypyrrole, a charge transfer complex based on TCNQ or the like, preferably material is used with preferred conductivity devices so that the conductivity or the resistance of the injection molded part can be designed differently in different directions in the desired manner.
  • Another preferred embodiment provides that the injection molded part closes a housing accommodating the contact and switching parts as a cover.
  • the temperature switch 1 designed according to the invention has a housing 2, which in the exemplary embodiment shown is made of metal to improve the heat transfer into the interior of the housing; instead, the housing can also be made of plastic, which may be at least thermally doped.
  • a holding part 3 which does not consist of metal, but can be a plastic injection-molded part made of high-temperature-resistant plastic, in particular thermoplastic.
  • the part 3 accommodates stationary contact parts 4, 6 in mutually opposing grooves, between which a Plastic injection part 7 is arranged made of high temperature resistant thermoplastic, which mechanically holds the two stationary contacts 4, 6 at a distance from each other.
  • the plastic injection part 7 has a low but finite electrical conductivity, it is high-resistance with a finite resistance.
  • a bimetallic spring 8 for example soldered to the contact part 6, which carries at its free end (at 9) a movable contact member 11 which, in a closed position, has a low-resistance contact between the stationary contact parts 4, 6 via the bimetal spring 8 produces and opens this low-resistance contact in an open position (not shown).
  • the plastic injection molded part 7 has a positive temperature characteristic of the electrical resistance.
  • the temperature switch shown is a so-called self-holding temperature switch, as used for monitoring electrical devices, such as transformers or the like, in relation to temperature.
  • the switch 1 At normal low temperature, the switch 1 is in its closed position, so that an electric current can flow from one of the stationary contact parts 4, 6 to the other contact part and through the device to be monitored, such as the primary winding of a transformer, without the switch according to the invention the current has a noticeable resistance, since the electrical parts forming the main current path have a low specific resistance. If the device to be monitored stops here for some reason, the temperature in switch 1 increases via a switching temperature given to the bimetallic element 8, so that it then lifts the contact element 11 from the stationary contact 4 and thus interrupts the low-resistance current path via it and the contact element 11 between the stationary contact parts 4, 6.
  • the molded part 7 Since the molded part 7 has a finite, albeit relatively high resistance, a small current still flows between the stationary contact parts 4, 6 via the molded part 7 even when the contact member and the bimetal element 8 are open. Due to the resistance of the molded part 7, current flows generated by this heat, which is sufficient to maintain the open position of the bimetal element 8 and the contact member 11, even if the device to be monitored cools down again due to the open position of the bimetal element 8 and the contact member 11. The closed position can only be reached again by disconnecting the contacts 4, 6 from the voltage source, so that no current can flow through the molded part 7, so that heat can no longer be generated, so that the temperature is the switch-back temperature of the bimetal element 8 can distinguish again and can thus return to its closed position.
  • the injection molded part 7 has a positive temperature coefficient of electrical resistance, so that it allows only a small current flow at high temperatures, so that immediately after opening the switch contact due to high temperature, the current flow through the injection molded part 7 does not increase leads to a further excessive temperature increase in the part to be monitored, but the injection molded part 7 itself allows a higher current flow and thus a larger one, which is necessary to maintain the opening point Amount of heat is generated when the part to be monitored continues to cool down due to the power interruption.
  • the self-holding switch according to the invention as is the case with such switches, clocking of the switch by continuously opening and closing the circuit in the case of a defective device is to be avoided and, in such a case, the device is to be kept permanently de-energized.

Landscapes

  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Thermally Actuated Switches (AREA)
  • Oscillators With Electromechanical Resonators (AREA)
  • Cookers (AREA)
  • Devices That Are Associated With Refrigeration Equipment (AREA)
  • Switches With Compound Operations (AREA)
EP90107825A 1990-04-25 1990-04-25 Temperaturschalter Expired - Lifetime EP0453596B1 (de)

Priority Applications (5)

Application Number Priority Date Filing Date Title
DK90107825.3T DK0453596T3 (da) 1990-04-25 1990-04-25 Temperaturomskifter
ES90107825T ES2071697T3 (es) 1990-04-25 1990-04-25 Interruptor termico.
DE59008766T DE59008766D1 (de) 1990-04-25 1990-04-25 Temperaturschalter.
AT90107825T ATE120303T1 (de) 1990-04-25 1990-04-25 Temperaturschalter.
EP90107825A EP0453596B1 (de) 1990-04-25 1990-04-25 Temperaturschalter

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP90107825A EP0453596B1 (de) 1990-04-25 1990-04-25 Temperaturschalter

Publications (2)

Publication Number Publication Date
EP0453596A1 EP0453596A1 (de) 1991-10-30
EP0453596B1 true EP0453596B1 (de) 1995-03-22

Family

ID=8203908

Family Applications (1)

Application Number Title Priority Date Filing Date
EP90107825A Expired - Lifetime EP0453596B1 (de) 1990-04-25 1990-04-25 Temperaturschalter

Country Status (5)

Country Link
EP (1) EP0453596B1 (da)
AT (1) ATE120303T1 (da)
DE (1) DE59008766D1 (da)
DK (1) DK0453596T3 (da)
ES (1) ES2071697T3 (da)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009053258C5 (de) * 2009-11-05 2016-01-14 Tmc Sensortechnik Gmbh Thermobimetallschalter und Verfahren zu seiner Montage

Families Citing this family (11)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4205699A1 (de) * 1992-02-25 1994-01-20 Hofsass P Vorrichtung zum Schützen eines Geräts
GB2275823B (en) * 1993-02-18 1996-11-27 Otter Controls Ltd Improvements relating to electric switches
DE4428226C1 (de) * 1994-08-10 1995-10-12 Thermik Geraetebau Gmbh Temperaturwächter
DE19609310C2 (de) * 1996-03-09 1999-07-15 Thermik Geraetebau Gmbh Schalter mit einem temperaturabhängigen Schaltwerk
CA2208910C (en) * 1996-07-04 2001-11-06 Ubukata Industries Co., Ltd. Thermal protector for electric motors
DE19708436C2 (de) * 1997-03-01 1999-08-19 Hofsaes Temperaturabhängiger Schalter mit Kontaktbrücke und Verfahren zu dessen Herstellung
DE19727197C2 (de) * 1997-06-26 1999-10-21 Marcel Hofsaess Temperaturabhängiger Schalter mit Kontaktbrücke
DE19816809C2 (de) * 1998-04-16 2001-10-18 Thermik Geraetebau Gmbh Temperaturabhängiger Schalter
FR3006127B1 (fr) * 2013-05-22 2016-11-25 Valeo Equip Electr Moteur Machine electrique tournante comprenant un module de protection thermique
CN113172118B (zh) * 2019-12-31 2024-10-29 青岛海模智云科技有限公司 一种模具智能终端
IT202300016170A1 (it) * 2023-07-31 2025-01-31 Miotti S R L Dispositivo limitatore di temperatura

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL7004367A (da) * 1970-03-26 1971-09-28
DE3122899C2 (de) * 1981-06-10 1984-10-11 Peter 7530 Pforzheim Hofsäss Temperaturschalter
DE8617033U1 (de) * 1986-06-26 1986-08-14 Temtech-Temperatur-Technik Hans-Peter Bojer, 7530 Pforzheim Bimetallschalter
DE8703049U1 (de) * 1987-02-27 1987-04-16 Microtherm Gmbh, 7530 Pforzheim Temperaturwächter
JPH0834075B2 (ja) * 1988-03-29 1996-03-29 東部電気株式会社 サーマルスイッチ

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102009053258C5 (de) * 2009-11-05 2016-01-14 Tmc Sensortechnik Gmbh Thermobimetallschalter und Verfahren zu seiner Montage

Also Published As

Publication number Publication date
DE59008766D1 (de) 1995-04-27
EP0453596A1 (de) 1991-10-30
ATE120303T1 (de) 1995-04-15
DK0453596T3 (da) 1995-08-14
ES2071697T3 (es) 1995-07-01

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