EP1225612A2 - Déclencheur thermique pour un dispositif de commutation - Google Patents

Déclencheur thermique pour un dispositif de commutation Download PDF

Info

Publication number
EP1225612A2
EP1225612A2 EP02000470A EP02000470A EP1225612A2 EP 1225612 A2 EP1225612 A2 EP 1225612A2 EP 02000470 A EP02000470 A EP 02000470A EP 02000470 A EP02000470 A EP 02000470A EP 1225612 A2 EP1225612 A2 EP 1225612A2
Authority
EP
European Patent Office
Prior art keywords
connecting element
contact
release device
thermal
thermal release
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
EP02000470A
Other languages
German (de)
English (en)
Other versions
EP1225612B1 (fr
EP1225612A3 (fr
Inventor
Wolfgang Leitl
Christoph Weber
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.)
Siemens AG
Siemens Corp
Original Assignee
Siemens AG
Siemens Corp
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 Siemens AG, Siemens Corp filed Critical Siemens AG
Publication of EP1225612A2 publication Critical patent/EP1225612A2/fr
Publication of EP1225612A3 publication Critical patent/EP1225612A3/fr
Application granted granted Critical
Publication of EP1225612B1 publication Critical patent/EP1225612B1/fr
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
    • 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
    • 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
    • H01H1/5822—Flexible connections between movable contact and terminal
    • 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
    • H01H1/5833—Electric connections to or between contacts; Terminals comprising an articulating, sliding or rolling contact between movable contact and terminal

Definitions

  • the invention relates to a thermal release device for a switching device with a one that is held stationary Contacting bimetallic strip, the free end due to thermal deformation increasingly a release lever acted upon in the direction of release.
  • switchgear mechanical or electromechanical switching devices in particular circuit breakers, circuit breakers, relays, Sagittarius or the like understood.
  • Such a switching device is used to connect a circuit with a power supply as well as for manual and automatic Disconnect the circuit from the mains when the electricity is one exceeds a predetermined value.
  • a circuit breaker to protect cables in installations and systems against overload and short circuit.
  • overcurrent protection devices such a switching device in addition in the event of a fault Touch voltages remain too high.
  • the switching device When switching on the switchgear or circuit breaker an energy accumulator, in particular a spring, as part of a mechanical switchgear or switch lock tensioned is released during the triggering process and actuated the switch.
  • the switching device includes a thermal release in the form of a usually strip-shaped bimetal, which triggers with a delay depending on the overload time. The triggering process is caused by a thermal deformation of the bimetal strip due to the overcurrent carried over the bimetal strip triggered. To do this, one acts on a stationary contact end opposite free end of the bimetal strip a trigger lever mechanically coupled to the rear derailleur, the one hand a moving contact or moving contact from a fixed contact and on the other hand the switch unlatched via the key switch.
  • the switchgear also includes usually also an instantaneous trigger magnetic or electromagnetic trigger for high shock and Short-circuit currents.
  • a strand connection is for example from DE 1 904 731 A1 and from EP 0 143 981 A1 is known.
  • this connecting element is that this the required release stroke of the movable Partially, i.e. the free end of the bimetal strip or the moving contact with the least possible influence the trigger movement follows.
  • the disadvantage is that due to the slackness of this connector its assembly in the manufacture of a corresponding switching device a considerable effort, especially in fixing the position and control with today's short-cycle automatic assembly, required. So when assembling such a slack connecting element is always kept on train to ensure its precise alignment and fixation guarantee.
  • the invention is therefore based on the object of a thermal Tripping device for a switching device, in particular for a circuit breaker to specify, in which the above Disadvantages are avoided.
  • This object is achieved according to the invention by the features of claim 1.
  • This is as a connecting element for electrical conductive connection of the bimetallic strip with the moving contact a component that is only flexible in the direction of release provided, which is rigid in the joining or assembly direction is.
  • the direction of assembly or assembly is as transverse to by the direction of release and the longitudinal direction of the bimetal strip spanned plane defined.
  • the connecting element as flexible in only one direction and rigid component in the other directions is expediently carried out in the manner of a current band.
  • a sheet-metal strip is particularly suitable for this Current band with a width of about 5mm and a thickness or Sheet thickness from approx. 0.1mm to 0.5mm.
  • As material for that band-like connecting element is expediently a copper alloy or a silver alloy.
  • this is as a current band executed connecting element cohesive on both sides with the bimetal strip on the one hand and with the movable one Contact or moving contact connected on the other hand.
  • connection on the bimetal strip provided at its free end. This ensures that the current flow initially over the entire Bimetal strip runs.
  • it is Current band bent or folded several times.
  • the curved Execution are expediently at least some, preferably several offsets are provided along the current band, the lowest possible resistance of the current band to reach against the moving contact. This also makes a large free bending length of the connecting element in the release direction achieved.
  • the current band is Connection element designed as sliding contact.
  • a contacting counter bearing is on Moving contact a corresponding contact or attachment contour integrally formed with the largest possible contact zone the free end of the current band-shaped as a sliding contact Ensures connecting element.
  • the sliding contact is in the form of a positive connection between the curved free end of the expediently stream bath-shaped Connecting element and either an outer contour or one formed by a preferably circular arc-shaped elongated hole Inner contour of the molded on a movable contact arm Approach realized.
  • the bimetal is expediently U-shaped.
  • a U-shaped one is suitable for this Stamped part, one U-leg on the free end with the bimetal support and its other U-leg on the free end the opposite of the sliding contact end of the current band-shaped connecting element also cohesively connected is.
  • an extension piece in the form, for example of a steel sheet, here again a material bond Connection is provided. The free end of the extension piece then forms the coupling point to the release lever and moves accordingly due to thermal deformation of the bimetal increasingly in the release direction.
  • the advantages achieved with the invention are in particular in that by using only in the direction of release flexible connecting element that in joining or Installation direction is rigid, a particularly simple manufacture or assembly of the thermal release device for a switching device is reached. This will make a significant one Cost savings in assembly production and final assembly of such a switching device.
  • the direction of movement the connecting element within the switching device, d. H. can be predicted particularly precisely within the housing itself.
  • FIGs 1a and 1b show sections of a switching device 1 with the housing cover lifted off, the housing 2 in which the essential parts of a thermal release device are shown visibly.
  • the thermal release device comprises a bimetallic strip 3, the contact end 3a of which a bimetallic carrier 4 cohesively connected and thus is kept stationary.
  • the bimetal support 4 is not shown in FIG illustrated manner with a terminal of the Switching device 1 electrically connected.
  • the free end 3b of the bimetal or bimetal strip is a release lever 5 spaced from each other, with a partially visible Switchgear or switch lock 6 is coupled.
  • a movable also coupled to the key switch 6 Contact arm 7 carries a movable contact or moving contact 8, the one fixed contact 9 (FIG 1b) on a stationary Contact arm 10 faces.
  • the open one is shown Position of contacts 8, 9 or switch contact, i.e. the moving contact 8 is lifted off the fixed contact 9.
  • On the bimetal support 4 is an arc rail 11 at the end set on the free end in an unspecified Extinguishing chamber protrudes.
  • the connecting element 12 is designed as a current band and has a current band thickness of approx. 0.2 mm and a current bandwidth of approx. 5 mm.
  • the current band-shaped made of copper or a copper alloy Connecting element 12 is at one end 12a with a molded onto the contact arm 7 of the moving contact 8 Approach 13 (FIG 1b) cohesively connected.
  • the other End 12b of the current band-shaped connecting element 12 also integrally with the free end 3b of the bimetallic strip 3 connected.
  • this is current band-shaped connecting element 12 curved, while in the embodiment according to FIG 2 a multiple Folding of the connecting element 12 is provided.
  • the curved design of the connecting element 12 are along its curved course provided multiple crankings 14. This results in a correspondingly large bending length of the connecting element 12 provided so that a particularly low Resistance of the connecting element 12 against the moving contact arm 7 and thus against the moving contact 8 is reached.
  • the connecting element 12 is only in all embodiments in the triggering direction A (FIG 1a) limp while the connecting element 12 in the joining or assembly direction F as rigid component is executed.
  • the direction of joining or assembly F runs across or perpendicular to the direction of release A and the longitudinal direction L of the bimetal strip 3 spanned plane and thus perpendicular to the plane of the drawing.
  • This configuration of the connecting element 12 as only soft in the direction of release A and otherwise rigid
  • component ensures that the connecting element 12 of the relative movement between the result thermal deformation in the direction of release A moving Free end 3b at least approximately without counterforce and thus practically without obstructing the movement of the bimetal strip 3 can follow.
  • the bending stiffness of the Connecting element 12 in the direction F transverse to the triggering direction A a particularly simple and reliable installation of the essentially from the connecting element 12 and the bimetallic strip 3 and from the bimetallic support 4 and the moving contact 7,8 existing trigger component of the switching device 1.
  • the free end can thus 3b of the bimetallic strip 3 as a result thermal deformation due to an over the bimetal strip 3 and the connecting element 12 and the movable Contact arm 7 to the moving contact 8 flowing overcurrent practically move freely in release direction A and the release lever 5 as intended for the purpose of unlatching the Actuate switch 6 with the consequence that the moving contact 8 stands out from the fixed contact 9.
  • the connecting element 12 is designed as a sliding contact.
  • End 12b with the bimetal strip or bimetal 3 cohesively connected.
  • This non-positive Connection between the free end 12'a of the connecting element 12 and one on the movable contact arm 7 molded projection 15 acts upon movement of the movable Contact arms 7 in release direction A as a frictional connection.
  • Around thereby an electrically as reliable as possible frictional connection To ensure over the entire release path is in this frictional connection between the free end 12'a of Connecting element 12 and the approach 15 as large as possible Contact or friction surface provided.
  • the connecting element 12 is again in the triggering direction A flexible and rigid in the joining direction F transverse to it Component executed.
  • the connecting element 12 are two in the housing 2 cone-like and opposite support struts 16,17 molded between which the connecting element 12th is passed through.
  • the support elements 16, 17 are possible close to the free end 12'a of the Connecting element 12 arranged to this when moving of the movable contact arm 7 as precisely as possible to keep.
  • the embodiment according to the figures differs 4a and 4b compared to the embodiment according to the figures 3a and 3b essentially by shaping the as Sliding contact effective free end 12'a of the connecting element 12.
  • the sliding contact on a the outer contour 20 of the extension 15 facing away from the slot 18 realized and only approximately quarter or semicircular bent.
  • the bimetal 3 is designed as a U-shaped. there is a first U-leg 21 of the bimetal 3 on the free end cohesively connected to the bimetallic support 4, while the other U-leg 22 on the free end with the fixing 12b of the connecting element 12 is integrally connected.
  • the sliding contact version has on both sides integral connection of the current band-shaped connecting element 12 advantages in the manufacture or assembly of the Switching device 1, especially since only a material connection between the respective stationary component, i.e. the bimetal 3 or the bimetallic carrier 4 and the movable component, i.e. the movable contact arm 7 is required. So at the sliding contact version is essentially made of bimetal 3 and the bimetal support 4 and the connecting element 12 existing thermal release device practical completely pre-assembled and is only a sliding contact assembly can be plugged into or plugged into the housing 2.

Landscapes

  • Thermally Actuated Switches (AREA)
  • Breakers (AREA)
  • Battery Mounting, Suspending (AREA)
  • Control And Other Processes For Unpacking Of Materials (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
EP02000470A 2001-01-19 2002-01-08 Déclencheur thermique pour un dispositif de commutation Expired - Lifetime EP1225612B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10102436 2001-01-19
DE10102436A DE10102436B4 (de) 2001-01-19 2001-01-19 Thermische Auslösevorrichtung für ein Schaltgerät

Publications (3)

Publication Number Publication Date
EP1225612A2 true EP1225612A2 (fr) 2002-07-24
EP1225612A3 EP1225612A3 (fr) 2004-09-15
EP1225612B1 EP1225612B1 (fr) 2009-10-28

Family

ID=7671164

Family Applications (1)

Application Number Title Priority Date Filing Date
EP02000470A Expired - Lifetime EP1225612B1 (fr) 2001-01-19 2002-01-08 Déclencheur thermique pour un dispositif de commutation

Country Status (3)

Country Link
EP (1) EP1225612B1 (fr)
AT (1) ATE447235T1 (fr)
DE (2) DE10102436B4 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2551885A1 (fr) 2011-07-28 2013-01-30 Eaton Industries GmbH Dispositif de protection contre les températures excessives pour un disjoncteur électrique

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2213080A (en) * 1937-09-02 1940-08-27 Gen Electric Bimetallic thermal release
DE837726C (de) * 1950-01-20 1952-05-02 Stotz Kontakt Gmbh Einrichtung zur Beeinflussung der Ausloesecharakteristik von thermischen Ausloesern fuer Selbstschalter
DE1665958A1 (de) * 1967-06-12 1971-04-08 Siemens Ag Hochbelastbare Kontaktanordnung
DE1904731C3 (de) * 1969-01-31 1975-11-20 Joseph Dipl.-Ing. 8500 Nuernberg Westermeyer Elektrischer Kleinselbstschalter
CH636730A5 (de) * 1978-10-26 1983-06-15 Sprecher & Schuh Ag Bimetall-thermoausloeser fuer ueberstromschalter.
DE3339401A1 (de) * 1983-10-29 1985-05-09 Sursum Elektrizitätsgesellschaft Leyhausen GmbH & Co, 8500 Nürnberg Selbstschalter zum aufsetzen auf schienen
US4897051A (en) * 1988-03-11 1990-01-30 Honeywell Inc. Flexible electric component leads
US5363076A (en) * 1993-04-28 1994-11-08 Square D Company Circuit breaker having spring biased blade suspension

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2551885A1 (fr) 2011-07-28 2013-01-30 Eaton Industries GmbH Dispositif de protection contre les températures excessives pour un disjoncteur électrique
WO2013014133A1 (fr) 2011-07-28 2013-01-31 Eaton Electrical Ip Gmbh & Co. Kg Dispositif de sécurité thermique pour un disjoncteur de protection électrique

Also Published As

Publication number Publication date
EP1225612B1 (fr) 2009-10-28
DE10102436B4 (de) 2006-06-29
DE10102436A1 (de) 2002-08-08
ATE447235T1 (de) 2009-11-15
DE50213955D1 (de) 2009-12-10
EP1225612A3 (fr) 2004-09-15

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