EP0548730A2 - Déclencheur thermique - Google Patents

Déclencheur thermique

Info

Publication number
EP0548730A2
EP0548730A2 EP92121252A EP92121252A EP0548730A2 EP 0548730 A2 EP0548730 A2 EP 0548730A2 EP 92121252 A EP92121252 A EP 92121252A EP 92121252 A EP92121252 A EP 92121252A EP 0548730 A2 EP0548730 A2 EP 0548730A2
Authority
EP
European Patent Office
Prior art keywords
area
free end
notch
strip
bent
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
EP92121252A
Other languages
German (de)
English (en)
Other versions
EP0548730B1 (fr
EP0548730A3 (en
Inventor
Peter Dr. Hoyer
Klaus Dr. Wittmann
Georgi Cwetanski
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.)
ABB Patent GmbH
Original Assignee
ABB Patent 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 ABB Patent GmbH filed Critical ABB Patent GmbH
Publication of EP0548730A2 publication Critical patent/EP0548730A2/fr
Publication of EP0548730A3 publication Critical patent/EP0548730A3/de
Application granted granted Critical
Publication of EP0548730B1 publication Critical patent/EP0548730B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Images

Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H69/00—Apparatus or processes for the manufacture of emergency protective devices
    • H01H69/01—Apparatus or processes for the manufacture of emergency protective devices for calibrating or setting of devices to function under predetermined conditions
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/74—Means for adjusting the conditions under which the device will function to provide protection
    • H01H71/7427—Adjusting only the electrothermal mechanism
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/14—Electrothermal mechanisms
    • H01H71/16—Electrothermal mechanisms with bimetal element

Definitions

  • the invention relates to a thermal release which can be installed in an electrical switching device and is designed as a strip and is clamped in place at one end and the other, free end of which is bent when an overcurrent occurs due to the heating caused by the overcurrent.
  • thermobimetals In electrical switchgear, thermal overcurrent relays or motor circuit breakers, strip-like or strip-shaped thermobimetals are normally used as triggers when overcurrents occur, which are heated either by direct or indirect heating. Recently, it has also become known to use strips of so-called shape memory alloys instead of thermobimetals.
  • shape memory alloys instead of thermobimetals.
  • the thermobimetals - like the shape memory alloys - are clamped in place at one end, whereas the other end is freely movable and presses against a ratchet lever when bending, thereby opening a latching point and releasing an energy store for actuating contact pieces.
  • All the triggers have in common that they are used to achieve a certain tripping characteristic, i.e. H. to trigger at a certain overcurrent, must be adjusted.
  • thermobimetal In the case of miniature circuit breakers, the thermobimetal is often fastened to one leg of a U-shaped or V-shaped fastening part, with a screw between the leg with which the thermobimetal can be adjusted. Adjustment by a screw is also known in other designs; Here is the nut part, in which the screw presses against the bimetal in the area of his foot and adjusts the free end.
  • thermobimetal there is a weakening in the area of the base of the thermobimetal, which allows the thermobimetal to bend with plastic deformation in the area of the foot.
  • a plate is provided in the area of the foot, one edge of which runs perpendicular to the longitudinal extent and parallel to the surface of the bimetal; the adjustment is carried out by adjusting the plate by deforming it or a web serving to hold the plate on a stationary element in such a way that the said edge bends the thermobimetal.
  • plastic support plates or washers are used between the phase failure protection slides and the thermobimetals.
  • thermobimetal Due to the fact that the thermobimetal is deformed in the area of the foot, the angle of the free end changes with respect to the latching point or the phase failure protection slide, which can cause friction which has an influence on the triggering accuracy.
  • the object of the invention is to adjust a thermal release using a strip made of a bimetallic metal and the like by adjusting the force direction of the release at the same time.
  • the strip is provided with a notch in the area of the free end, as a result of which an end area is formed which can be easily deformed by the notch due to the reduction in cross section.
  • the end region between the notch and the free end can have a cross section that is the same or reduced compared to the rest of the strip.
  • the adjustment of the free end or bending of the free end of the strip takes place by means of a fork-like device in which the strip is held stationary in the area of the notch and the end is gripped with a fork part and bent in a corresponding manner.
  • the free end i.e. H. the area between the notch and the end forms a straight plane or is bent in itself, the fold line being perpendicular to the longitudinal extension of the strip.
  • the latter buckling is useful if a special force component is to be achieved on the latching point in order to avoid jamming at the latching point or - if phase failure sliders are provided - on the slider system.
  • thermobimetal 10 has two areas 13 and 14 separated by two notches 11 and 12, the lengths L and l of which are dimensioned such that L »l is.
  • the width B1 of the area 13 is equal to the width B2 of the area 14, whereas the cross section of the area 13 is very much larger in comparison with the cross section of the bimetal 10 in the area of the two notches.
  • the bimetallic metal 15 can also be designed such that an area 18 is formed by notches 16 and 17, the width B4 is smaller, possibly half as large as the width B3.
  • the aspect ratios are the same.
  • FIG. 3 shows the thermal bimetal 10 and it can be seen that it is bent by an angle ⁇ in the area of the notches 11, 12, the area 13 being flat.
  • the bimetallic metal 15, which is shown in a side view in FIG. 4, is also kinked in the area 16/17, the end area 18 being kinked by a line, whereby two sub-areas 19 and 20 are formed which form an obtuse angle form.
  • the partial area 20 can run approximately parallel to the remaining area of the bimetal. How the obtuse angle between the two partial areas 19 and 20 is dimensioned depends on the desired direction of force of the free end of the thermobimetal, in this case the partial area 20, on the latching point or - in the case of a motor protection switch - on a phase failure slide.
  • thermobimetal 10 can be preformed, for example in the region of the notch 11 and 12, so that the region 14 is bent by an angle ⁇ 1.
  • the angle ⁇ 1 can be smaller than the angle ⁇ (see Figure 3).
  • FIG. 3 shows three elements of a device with which the end region 14 is deformed.
  • This device has a fixed stop 21 to which two movable fork fingers 22 are assigned; the two fork fingers 22 take the free end 14 between them and can thus deform the end region 14, and when the two fork fingers 22 rotate and shift around one another, the bent version according to FIG. 4 can be produced.

Landscapes

  • Engineering & Computer Science (AREA)
  • Manufacturing & Machinery (AREA)
  • Thermally Actuated Switches (AREA)
EP92121252A 1991-12-24 1992-12-14 Déclencheur thermique Expired - Lifetime EP0548730B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE4142965 1991-12-24
DE4142965A DE4142965A1 (de) 1991-12-24 1991-12-24 Thermischer ausloeser

Publications (3)

Publication Number Publication Date
EP0548730A2 true EP0548730A2 (fr) 1993-06-30
EP0548730A3 EP0548730A3 (en) 1993-10-13
EP0548730B1 EP0548730B1 (fr) 1995-08-23

Family

ID=6448130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP92121252A Expired - Lifetime EP0548730B1 (fr) 1991-12-24 1992-12-14 Déclencheur thermique

Country Status (2)

Country Link
EP (1) EP0548730B1 (fr)
DE (2) DE4142965A1 (fr)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1243793A3 (fr) * 2001-03-24 2005-09-07 Conti Temic microelectronic GmbH Elément de commande, en particulier d'un mecanisme de commande pour un dispositif de prise d'images
WO2006017426A1 (fr) * 2004-08-03 2006-02-16 Siemens Energy & Automation, Inc. Systemes, procedes, et dispositif d'actionnement d'un disjoncteur
WO2013083831A1 (fr) * 2011-12-09 2013-06-13 Eaton Industries (Austria) Gmbh Procédé de réglage d'une unité de déclenchement destinée à un disjoncteur

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE4336073A1 (de) * 1993-10-22 1995-04-27 Abb Patent Gmbh Thermischer Überstromauslöser für ein elektrisches Schaltgerät
DE19735135A1 (de) * 1997-08-13 1999-02-25 Siemens Ag Verfahren zur Justierung von Schaltelementen aus Bimetallen
DE10119290A1 (de) * 2001-04-20 2002-10-24 Conti Temic Microelectronic Stellelement, insbesondere als Teil eines Stellantriebs für ein Bilderfassungssystem

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE883778C (de) * 1943-07-30 1953-07-20 Voigt & Haeffner Ag Zweimetallstreifen, insbesondere fuer mehrpolige Ausloeser elektrischer Schaltgeraete
DE1029916B (de) * 1957-02-13 1958-05-14 Anni Margareta Leyhausen Geb E Verfahren zum Einstellen von Ausloesevorrichtungen an elektrischen Kleinselbstschaltern
FR1392626A (fr) * 1964-02-04 1965-03-19 Comp Generale Electricite Dispositif de fixation et de réglage notamment pour relais thermique
FR1564704A (fr) * 1968-02-21 1969-04-25

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP1243793A3 (fr) * 2001-03-24 2005-09-07 Conti Temic microelectronic GmbH Elément de commande, en particulier d'un mecanisme de commande pour un dispositif de prise d'images
WO2006017426A1 (fr) * 2004-08-03 2006-02-16 Siemens Energy & Automation, Inc. Systemes, procedes, et dispositif d'actionnement d'un disjoncteur
US7391289B2 (en) 2004-08-03 2008-06-24 Siemens Energy & Automation, Inc. Systems, methods, and device for actuating a circuit breaker
WO2013083831A1 (fr) * 2011-12-09 2013-06-13 Eaton Industries (Austria) Gmbh Procédé de réglage d'une unité de déclenchement destinée à un disjoncteur

Also Published As

Publication number Publication date
DE4142965A1 (de) 1993-07-01
EP0548730B1 (fr) 1995-08-23
DE59203382D1 (de) 1995-09-28
EP0548730A3 (en) 1993-10-13

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