EP2565892A1 - Commutateur électrique - Google Patents

Commutateur électrique Download PDF

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Publication number
EP2565892A1
EP2565892A1 EP12176198A EP12176198A EP2565892A1 EP 2565892 A1 EP2565892 A1 EP 2565892A1 EP 12176198 A EP12176198 A EP 12176198A EP 12176198 A EP12176198 A EP 12176198A EP 2565892 A1 EP2565892 A1 EP 2565892A1
Authority
EP
European Patent Office
Prior art keywords
protective material
rotor housing
switch
electric switch
functional
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
EP12176198A
Other languages
German (de)
English (en)
Other versions
EP2565892B1 (fr
Inventor
Jürgen Birner
Walter Felden
Bernhard Hannich
Thomas Pniok
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
Original Assignee
Siemens AG
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 filed Critical Siemens AG
Publication of EP2565892A1 publication Critical patent/EP2565892A1/fr
Application granted granted Critical
Publication of EP2565892B1 publication Critical patent/EP2565892B1/fr
Not-in-force legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H3/00—Mechanisms for operating contacts
    • H01H3/62—Lubricating means structurally associated with the switch
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H1/00—Contacts
    • H01H1/12—Contacts characterised by the manner in which co-operating contacts engage
    • H01H1/14—Contacts characterised by the manner in which co-operating contacts engage by abutting
    • H01H1/20—Bridging contacts
    • H01H1/2041—Rotating bridge
    • H01H1/205—Details concerning the elastic mounting of the rotating bridge in the rotor
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H73/00—Protective overload circuit-breaking switches in which excess current opens the contacts by automatic release of mechanical energy stored by previous operation of a hand reset mechanism
    • H01H73/02—Details
    • H01H73/04—Contacts
    • H01H73/045—Bridging contacts
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H77/00—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting
    • H01H77/02—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism
    • H01H77/10—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening
    • H01H77/102—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement
    • H01H77/105—Protective overload circuit-breaking switches operated by excess current and requiring separate action for resetting in which the excess current itself provides the energy for opening the contacts, and having a separate reset mechanism with electrodynamic opening characterised by special mounting of contact arm, allowing blow-off movement whereby the blow-off movement unlatches the contact from a contact holder

Definitions

  • the invention relates to an electrical switch, in particular circuit breaker. Moreover, the invention relates to a method for improving such a switch.
  • Electrical circuit breakers often have a rotary contact system, which has two fixed contacts for connection to a respective current path and a rotatably mounted, cooperating with at least one of the fixed contacts contact member.
  • the mostly in the form of a bridge running movable contact member serves to interrupt the circuit and close.
  • an actuating mechanism for example in the form of a rocker arm.
  • the contact bridge is intended to open very quickly by electrodynamic forces independently of the actuating mechanism.
  • An object of the present invention is to provide an electrical switch which is protected in a particularly simple manner from contamination and / or damage by burned-off materials. This object is achieved by a switch according to claim 1 and a method according to claim 10. Advantageous embodiments of the invention are specified in the subclaims.
  • a key idea of the invention is to at least partially cover the surfaces of some or all of the functional parts of the switch with a protective material, the protective material being a viscous, heat-resistant mass.
  • a protective material being a viscous, heat-resistant mass.
  • the mass used prevents the hot burned-off substances from settling on or attaching to the function-relevant partial surfaces, thereby causing contamination or damage to the surfaces. This ensures that a proper opening of the switch is not hindered even after a repeated occurrence of abrasives.
  • the invention can be used for all electrical switches in which contamination by burned-off substances takes place, but in particular in the case of circuit breakers, such as molded case circuit breakers.
  • the protective material used is viscous.
  • the minimum viscosity of the raw materials used for the protective material is preferably 300 mm 2 / s at 40 ° C (DIN 51562).
  • the protective material used is preferably permanently elastic and, after termination of a force effect, returns to its initial form immediately or in a short time which is acceptable for the application.
  • This resilience is advantageously so pronounced that the material completely or at least almost completely resumes its original shape.
  • it is a non-hardening, pasty, moldable material, which retains its elastic properties, in particular its restoring force, in the temperature range occurring.
  • the deformation characteristic of the material used is preferably characterized by a viscoelastic behavior.
  • the material exhibits partial elastic, partial viscous behavior.
  • plastic properties may also be added which allow sliding of structural elements of the electrical switch on the protective material.
  • the protective material can therefore also exhibit an elastoplastic, a plasto-elastic or other deformation behavior.
  • the protective material is a temperature-resistant material with a temperature resistance of at least 200 ° C. This means that the material is chemically stable up to this temperature and retains its mechanical properties, in particular with regard to its elasticity.
  • the protective material is chosen to withstand the high temperatures near the arc and not to burn or burn during arc of the switching arc.
  • the protective material used preferably has a high adhesiveness.
  • a defined minimum adhesion ensures that the material remains in the intended areas and does not overlap with other areas of the switch in which a cover with protective material is not desired.
  • the protective material is preferably a grease, in particular a grease. This has the advantage that the protective material not only the functional surfaces or recording volume to be protected against deposition of abrasives or protects other pollution. At the same time, the protective material also serves as a lubricating agent and thereby reduces mechanical friction and wear. In contrast to other materials that can be applied to surfaces, such as oils or the like, fat does not drip off, but remains at the lubrication point.
  • the present invention can be used in electrical switches, in which a rotary contact system is used and a pivotable contact arm is arranged in a rotor housing.
  • a rotary contact system is used and a pivotable contact arm is arranged in a rotor housing.
  • a pivotable contact arm is arranged in a rotor housing.
  • the interior of the rotor housing at least partially functional elements or parts of functional elements, which are for the function of the switch, in particular the opening function of importance and are provided with the protective material.
  • the moving away of the functional element takes place along at least one functional surface of the rotor housing and that such that the functional element touches the functional surface, for example, is supported on it, and / or the moving away of the functional element takes place in such a way that the functional element moves into a receiving volume of the rotor housing or along a void volume.
  • the rotor housing for the functioning of relevant areas in the form of areas and / or receiving or void volume, which are covered according to the invention with the protective material.
  • a receiving volume is understood as meaning a volume which is designed for the complete or partial reception of the functional element, for example in order to provide an end position of the functional element.
  • a void volume is understood to mean a volume that is empty - for example, due to design specifications - and is not intended for receiving the functional element. Its importance for the operation of the switch typically obtains a void volume by the fact that a functional element is moved past the void volume or along the void volume while performing its function, and burnt-out would obstruct this movement as it fills the void volume already filled empty volume would protrude into the path of movement of the functional element.
  • the protective material can advantageously be used in such a way that, on the one hand, it is used as a protective layer in order to cover functional surfaces. It thus prevents burn-up products from accumulating on these surfaces and thereby increasing the sliding friction when opening the electrical switch.
  • the protective material can also be used as a bulk filling material. The material closes the volume and thus prevents burning products from accumulating in the volume and filling the volume required for the function of the switch. Recording volumes are for the functional element of the switch kept free. The unwanted filling of void volume is prevented.
  • the application of the protective material to the surfaces of the functional parts is carried out manually in one embodiment of the invention, for example by painting, preferably using a brush.
  • the application of the protective material takes place by injection with the aid of a spray nozzle, for example via correspondingly provided filling openings in the rotor housing.
  • the distribution of the protective material on the surfaces in this case preferably takes place via the proper movement of the protective material. Injection can be automated.
  • the invention is not limited to the protection of electrical switches with rotary contact system, but can also be applied to other types of switches.
  • FIG. 1 shows an electrical switch 10 with rotary contact system, as described in the previously unpublished German patent application "electric switch” the same applicant from 25.01.2011 (internal reference 2010 24036).
  • the rotor housing 20 is rotatable about the rotation axis 40 along the arrow direction P.
  • a contact bridge 30 which is also pivotable about the axis of rotation 40 together with the rotor housing 20 or relative to the rotor housing 20 also along the direction of the arrow P.
  • the contact bridge 30 is formed by a first contact arm 50 and a second contact arm 51. Each of the two contact arms 50 and 51 is provided at its end with a contact element 60, 61.
  • Two stationary contact rails 70, 71 cooperate with the contact bridge 30.
  • the two contact rails 70, 71 are each equipped with a stationary contact element 80, 81.
  • the switch 10 is closed, so that an electric current can flow from the contact rail 70 via the contact bridge 30 to the contact rail 71.
  • the contact elements 60 and 61 of the contact bridge 30 are located on the corresponding stationary contact elements 80, 81 of the two contact rails 70, 71.
  • FIG. 2 is a cross section of the switch 10 is shown in the on state.
  • the rotor housing 20 includes a Housing shell 21 with an edge portion which has an edge inner surface 22.
  • the edge inner surface 22 forms a wall portion, on which two intermediate parts in the form of balls 100, 101 can slide and / or roll.
  • first recesses 110, 111 are located in the edge inner surface 22, in which they are resiliently held by springs 120, 121.
  • the first two recesses 110, 111 thus define a first detent position for the contact bridge 30 and the two balls 100, 101.
  • the two balls 100, 101 form separate parts which are mechanically connected neither to the housing shell 21 or the rotor housing 20, nor to the contact bridge 30. It is in the balls 100, 101 to separate components that are held only resiliently clamped between the housing shell 21 of the rotor housing 20 and the contact bridge 30 by the two springs 120, 121.
  • the two balls 100, 101 must be used only in the recesses 110, 111 and there clamped by means of the two springs 120, 121.
  • the two springs 120, 121 each have two spring ends, of which a first spring end presses directly on one of the two balls and of which the second spring end is supported on one of the contact arms of the contact bridge 30. In order to ensure a uniform force transmission, one of the two springs 120 is supported on the first contact arm 50 of the contact bridge 30 and the other spring 121 on the second contact arm 51 of the contact bridge 30.
  • first detent position of the contact bridge 30 are thus only the rotor housing 20, the contact bridge 30, the two balls 100, 101 and the two springs 120, 121 required.
  • FIG. 3 shows the state of the switch 10 after the contact bridge 30 has been pivoted relative to the rotor housing 20. Due to the pivoting of the contact bridge 30, the balls 100, 110 were unrolled on the edge inner surface 22 of the housing shell 21 and each brought into a second detent position of the contact bridge 30. This second latching position is defined by second recesses 200, 201 in the edge inner surface 22. Also in the second detent position, the two balls 100, 101 are resiliently held, and indeed by the two springs 120, 121, which are supported on the two contact arms 50, 51 of the contact bridge 30.
  • the second detent position ensures that the open switching state of the contact elements can latch and the switch remains open even when the tripping current, which has caused the rotation of the contact bridge 30, dies down again.
  • the balls 100, 101 described above are functional elements of the rotary contact system of the switch 10. They hold the contact arms 50, 51 of the contact bridge 30 to form a mechanical connection with the rotor housing 20 and fixed in the case of a relative rotation between the contact arms 50, 51 and the rotor housing 20 is moved away.
  • the moving away of the balls 100, 101 takes place along at least of the functional surface of the rotor housing 20, namely slidably on the edge inner surface 22 of the housing shell 21 from the recesses 110, 111 out and into the recesses 200, 201 in which receiving volume for the balls 100, 101 form.
  • These functional surfaces are surfaces of functional parts of the switch 10, which are relevant for the function of the switch 10, in particular the opening function.
  • the first and second recesses 110, 111, 200, 201 form receiving volumes on the one hand.
  • the recesses 110, 111, 200, 201 simultaneously serve as functional surfaces along which the balls 100, 101 move in a sliding or rolling manner.
  • the protective material 300 for protection against soiling and / or damage by burned-off materials, wherein the protective material 300 is a viscous, temperature-resistant mass, in this case a lubricating grease.
  • a high-temperature grease can be used, for example, high-temperature greases based on Teflon or ceramic are suitable.
  • high temperature hybrid greases can be used as the protective material 300, which is a mixture of mineral fats and teflon based fats.
  • a viscous, temperature-resistant mass of the protective material 300 are also silicone-based materials into consideration.
  • the surfaces to be provided with the protective material 300 in the exemplary embodiment shown here are the recesses 200, 201 which define the second latching position.
  • the second recesses 200, 201 are as in the direction of rotation P continuously deepening, wedge-shaped Carrying volume executed and close directly to the first recesses 110, 111 at.
  • the recesses 200, 201 are partially filled with grease.
  • the protective material 300 yields.
  • the material 300 is displaced by the balls 100, 101 and thus allows the inclusion of the balls 100, 101 in the receiving volume and finally the positioning of the balls 100, 101 in the second locking positions, as in FIG. 3 displayed.
  • the protective material 300 resumes its original shape and closes the recesses 200, 201.
  • the protective material does not hinder the operation of the switch 10. Proper switching operations are guaranteed. At the same time contamination and damage of the functional parts 200, 201 is prevented by abrasives in a simple and cost-effective manner.

Landscapes

  • Rotary Switch, Piano Key Switch, And Lever Switch (AREA)
EP12176198.5A 2011-08-29 2012-07-12 Commutateur électrique Not-in-force EP2565892B1 (fr)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE201110081736 DE102011081736A1 (de) 2011-08-29 2011-08-29 Elektrischer Schalter

Publications (2)

Publication Number Publication Date
EP2565892A1 true EP2565892A1 (fr) 2013-03-06
EP2565892B1 EP2565892B1 (fr) 2016-10-19

Family

ID=46516564

Family Applications (1)

Application Number Title Priority Date Filing Date
EP12176198.5A Not-in-force EP2565892B1 (fr) 2011-08-29 2012-07-12 Commutateur électrique

Country Status (4)

Country Link
US (1) US9111699B2 (fr)
EP (1) EP2565892B1 (fr)
CN (1) CN102969190B (fr)
DE (1) DE102011081736A1 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN111769016B (zh) * 2020-06-06 2022-07-05 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） 一种塑壳断路器多触指动触头及触头系统

Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733033A (en) * 1986-12-15 1988-03-22 General Electric Company Molded case circuit breaker contact arrangement including a spring clip contact arm retainer
US6396018B1 (en) * 1999-09-30 2002-05-28 Kabushiki Kaisha Toshiba Power circuit switch
EP1229566A1 (fr) * 2000-08-18 2002-08-07 Mitsubishi Denki Kabushiki Kaisha Disjoncteur
WO2005059941A1 (fr) * 2003-12-16 2005-06-30 Moeller Gmbh Systeme de contact a pivotement electrodynamique pour sectionneurs de puissance
DE102008039066A1 (de) 2008-08-21 2010-02-25 Siemens Aktiengesellschaft Leistungsschalter mit verschwenkbarem Überbrückungselement

Family Cites Families (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE19624780A1 (de) * 1996-06-21 1998-01-02 Bosch Gmbh Robert Positonssensor
CN2640027Y (zh) 2003-08-10 2004-09-08 周朝济 具有斥力机构的限流装置
DE112007003283T5 (de) * 2007-01-24 2010-02-04 Siemens Aktiengesellschaft Doppelunterbrechungskontaktsystem für einen Niederspannungsleistungsschalter und das Doppelunterbrechungskontaktsystem umfassender Kompaktleistungsschalter
DE102007040163A1 (de) 2007-08-21 2009-02-26 Siemens Ag Schaltgerät mit einer Schaltwelle zur Lagerung einer Drehkontaktbrücke sowie mehrpolige Schaltgeräteanordnung
DE102008039187B4 (de) * 2008-08-20 2019-06-19 Siemens Aktiengesellschaft Leistungsschalter, insbesondere für Niederspannungen
CN102262983B (zh) * 2010-05-28 2014-12-31 西门子公司 一种转动触头组件
DE102011003131A1 (de) 2011-01-25 2012-07-26 Siemens Aktiengesellschaft Elektrischer Schalter

Patent Citations (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4733033A (en) * 1986-12-15 1988-03-22 General Electric Company Molded case circuit breaker contact arrangement including a spring clip contact arm retainer
US6396018B1 (en) * 1999-09-30 2002-05-28 Kabushiki Kaisha Toshiba Power circuit switch
EP1229566A1 (fr) * 2000-08-18 2002-08-07 Mitsubishi Denki Kabushiki Kaisha Disjoncteur
WO2005059941A1 (fr) * 2003-12-16 2005-06-30 Moeller Gmbh Systeme de contact a pivotement electrodynamique pour sectionneurs de puissance
DE102008039066A1 (de) 2008-08-21 2010-02-25 Siemens Aktiengesellschaft Leistungsschalter mit verschwenkbarem Überbrückungselement

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
ANONYMOUS: "HOTEMP 2000 High-Temperature lubricating oil", 1 February 2007 (2007-02-01), XP002689546, Retrieved from the Internet <URL:http://web.archive.org/web/20101101101254/http://klubersolutions.com/pdfs/HOTEMP%202000.pdf> [retrieved on 20121219] *

Also Published As

Publication number Publication date
US20130048481A1 (en) 2013-02-28
DE102011081736A1 (de) 2013-02-28
US9111699B2 (en) 2015-08-18
CN102969190A (zh) 2013-03-13
EP2565892B1 (fr) 2016-10-19
CN102969190B (zh) 2016-08-17

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