EP2323155B1 - Movable contactor device of circuit breaker - Google Patents

Movable contactor device of circuit breaker Download PDF

Info

Publication number
EP2323155B1
EP2323155B1 EP08808716.8A EP08808716A EP2323155B1 EP 2323155 B1 EP2323155 B1 EP 2323155B1 EP 08808716 A EP08808716 A EP 08808716A EP 2323155 B1 EP2323155 B1 EP 2323155B1
Authority
EP
European Patent Office
Prior art keywords
parts
movable contact
pair
crossbar
connecting conductor
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.)
Not-in-force
Application number
EP08808716.8A
Other languages
German (de)
English (en)
French (fr)
Other versions
EP2323155A4 (en
EP2323155A1 (en
Inventor
Masatoshi Murai
Kazumasa Watanabe
Akira Senoo
Michiaki Kuwada
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.)
Mitsubishi Electric Corp
Original Assignee
Mitsubishi Electric 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 Mitsubishi Electric Corp filed Critical Mitsubishi Electric Corp
Publication of EP2323155A1 publication Critical patent/EP2323155A1/en
Publication of EP2323155A4 publication Critical patent/EP2323155A4/en
Application granted granted Critical
Publication of EP2323155B1 publication Critical patent/EP2323155B1/en
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
    • 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
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • 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
    • H01H1/22—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact
    • H01H1/221—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member
    • H01H2001/223—Contacts characterised by the manner in which co-operating contacts engage by abutting with rigid pivoted member carrying the moving contact and a contact pressure spring acting between the pivoted member and a supporting member using a torsion spring
    • 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
    • H01H77/104—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 with a stable blow-off position

Definitions

  • the present invention relates to improvements of a movable contact device in a circuit breaker.
  • a circuit breaker such as a molded case circuit breaker or an earth leakage circuit breaker has a power supply side terminal connected to the power supply side of a distribution circuit, a load side terminal connected to the load side of the distribution circuit, a fixed contact point provided in the power supply side terminal, and a movable contact device including movable contacts respectively having movable contact points that are connected to the load side terminal and able to be in contact with or separated from the fixed contact point, an opening and closing mechanism that drives the movable contact device to bring the movable contact points into contact with or separate them from the fixed contact point, an operation handle for manual operation of the opening and closing mechanism, and an automatic tripping device that automatically drives the opening and closing mechanism when a predetermined overcurrent flows or a leakage current flows in the distribution circuit to break the distribution circuit.
  • a movable contact device for the circuit breaker a configuration including a plurality of movable contacts of conductors with one ends having movable contact points and the other ends penetrated by shaft pins, a crossbar made of an insulating material for holding these shaft pins of the movable contacts and rotatably supporting the respective movable contacts around the shaft pins, a nipping piece of a conductor for nipping the other ends of the movable contacts from both sides in the shaft direction of the shaft pins into sliding contact with the other ends of the movable contacts, a flexible conductor with one end connected to the nipping piece and the other end connected to the load side terminal, and a torsion coil spring that urges the movable contacts in a direction in which predetermined contact pressure is provided to the movable contact points at ON operation of the circuit breaker is proposed (for example, see Patent Document 1).
  • a notch part is formed in the above described nipping piece, and the nipping piece is adapted to receive the shaft pins penetrating the other ends of the movable contacts by the notch part.
  • the above described torsion coil spring has a pair of coil parts with one ends fixed to the crossbar and the above described shaft pins inserted to serve as compression springs, and a coupling piece integrally coupling the other ends of the coil parts, and the coupling piece comes into pressure contact with the above described movable contacts to constantly urge the movable contacts in ON direction.
  • the contact condition between the movable contacts and the nipping piece may be stabilized and the movable contacts and the flexible conductor can be held in an electrically good contact condition while the movable contacts rotate around the shaft pins.
  • Patent Document 1 JP-A-2001-68008
  • JP 2000-268 697 A is considered as related prior art, and is directed to the provision of a movable contact device for a circuit breaker, not suffering deterioration in the movement of movable contacts if the centre of turning motion of crossbars and the centre of turning motion of the movable contacts are displaced from each other, reduced in the number of component items, and easy in assembling work.
  • a movable contact device which is equipped with: crossbars interlocking with a switching mechanism, movable-contact bearers fixed to a body case and each having a pair of connecting conductor parts fitted into recesses in the crossbar, movable contacts turnably journalled on and electrically connected to protrusions provided on the connecting conductor parts and engaged with the crossbars, and contact pressure spring having twisted spring parts on both ends thereof fittingly mounted between two outside surface of the connecting conductor parts and the recesses in the crossbars, and intermediate action spring parts engaging with the movable contacts and biasing the movable contacts toward fixed contacts.
  • the nipping piece is slid on the side surfaces of the movable contacts under the condition that the nipping piece is pressed against the side surfaces of the movable contacts by the torsion coil spring.
  • scratches may be produced on the side surfaces of the movable contacts and the inner surface of the nipping piece.
  • the movable contact device As another assembly method of the movable contact device, there is a method of integrally assembling the movable contacts and the nipping piece in advance, and then, attaching the movable contacts and the nipping piece to the crossbar.
  • the assembly method of the movable contact device when the movable contacts and the nipping piece integrally assembled in advance are attached to the crossbar, the nipping piece may be dropped from the movable contacts.
  • the invention has been achieved to solve the above described problems in the conventional movable contact device for a circuit breaker, and is intended to provide a movable contact device for a circuit breaker, the movable contact device easily assembled with the smaller number of component parts.
  • a movable contact device for a circuit breaker according to the invention is characterized by the features of claim 1.
  • the contact pressure spring includes a pair of coil spring parts that are fitted between respective outer side surfaces of the pair of connecting conductor parts and side walls of the recess part of the crossbar and urge the pair of connecting conductor parts toward the other end side of the movable contact, an arm-like spring part that couples one ends of the respective pair of coil spring parts to each other, extends to one end side of the movable contact to abut against the movable contact, and urges the movable contact to provide the contact pressure to the movable contact, and a pair of leg parts that extend from the respective other ends of the pair of coil spring parts in a direction opposite to the one end side of the movable contact and abut against wall surfaces of the recess part of the crossbar when the contact pressure spring is fitted
  • FIG. 1 a circuit breaker including a movable contact device according to Embodiment 1 of the invention will be explained.
  • a base 1 and a cover 2 formed by a synthetic resin material are integrally assembled by screws (not shown) to form a casing of a circuit breaker 100 for three phases.
  • a power supply side terminal 3 connected to the power supply side of a three-phase electric circuit (not shown) opened and closed by the circuit breaker 100, and a load side terminal 4 connected to the load side of the above described electric circuit are fixed.
  • a fixed contact point 5 is fixed.
  • a crossbar 6 formed by a synthetic resin material is supported by the base 1 to be rotatable around its center of axle.
  • a movable contact 8 having a movable contact point 7 at one end has the other end inserted into a recess part, which will be described later, of the crossbar 6 as will be described later.
  • a contact pressure spring 9 is fitted in the above described recess part of the crossbar 6 and urges the movable contact 8 to provide contact pressure to the movable contact point 7 as will be described later.
  • a movable contact supporting member 10 has a base part 11 fixed to the base 1 and a pair of connecting conductor parts 101, 102 (only 101 is shown in FIG. 1 ) rising nearly vertically from the base part 11, and the inner side surfaces of these connecting conductor parts 101, 102 are slidably and electrically connected to the side surfaces of the other end of the movable contact 8 and the pair of connecting conductor parts 101, 102 rotatably support the other end of the movable contact 8.
  • the base part 11 of the movable contact supporting member 10 is connected to the load side terminal 4 via a load side connecting conductor 41.
  • the above described crossbar 6, movable contact point 7, movable contact 8, contact pressure spring 9, and movable contact supporting member 10 form a movable contact device 12 according to Embodiment 1 of the invention.
  • the details of the configuration of the movable contact device 12 will be described later.
  • a lower link 13 has one end rotatably coupled to the crossbar 6 and the other end rotatably coupled to one end of an upper link 14.
  • An operation mechanism part 15 has one end rotatably supported by the base 1 and the other end to which an operation handle 16 operated by an operator is fixed.
  • the above described upper link 14 has the other end rotatably coupled to the other end of the operation mechanism part 15.
  • a toggle spring 17 formed by a tension spring has one end fixed to the coupling part of the lower link 13 and the upper link 14 and the other end fixed to the other end of the operation mechanism part 15,
  • the lower link 13, the upper link 14, and the toggle spring 17 form a so-called toggle link mechanism.
  • the operation handle 16 is operated to the left of the drawing by the operator from the state in which the handle 16 is in the closed position at the right of the drawing as shown in the drawing, the operation mechanism part 15 rotates around its one end in a direction of the opened position at the left of the drawing.
  • the upper link 14 and the lower link 13 have the alignment relation as shown in the drawing by the tension force of the toggle spring 17.
  • the lower link 13 rapidly rotates the crossbar 6 clockwise, and rotates the movable contact 8 clockwise and brings the movable contact point 7 into contact with the fixed contact point 5.
  • the movable contact 8 is urged by the contact pressure spring 9 and provides predetermined contact pressure to the movable contact point 7 in contact with the fixed contact point 5.
  • An automatic tripping device 18 engages with a part of the upper link 14 to latch the counter-clockwise rotation of the upper link 14 around its other end when the operation handle 16 is located in the closed position as shown in the drawing, that is, when the movable contact point 7 is in contact with the fixed contact point 5 and closes the electric circuit.
  • a time-limit tripping mechanism of a bimetal and an instantaneous tripping mechanism of an electromagnet are provided.
  • the time-limit tripping mechanism of the automatic tripping device 18 operates to release the above described latch.
  • the upper link 14 rapidly rotates counter-clockwise around its other end by the tension force of the toggle spring 17 and the lower link 13 is rapidly raised upward in the drawing, and, at the same time, the crossbar 6 rotates counter-clockwise.
  • the movable contact point 7 of the movable contact 8 rapidly separates from the fixed contact point 5 and breaks the electric circuit.
  • an excessive current such as a short-circuit current flows in the electric circuit
  • the instantaneous tripping mechanism of the automatic tripping device 18 operates to release the above described latch.
  • the electric circuit is instantaneously broken by the same operation as the operation by the above described time-limit tripping mechanism.
  • the crossbar 6 is formed by a synthetic resin material as described above, and both ends in its shaft direction are rotatably supported by the base 1.
  • three movable contact attachment parts 60 for respectively attaching the movable contacts 8, the contact pressure springs 9, and the movable contact supporting members 10 corresponding to U-phase, V-phase, and W-phase are provided at equal intervals W.
  • the crossbar 6 includes a recess part 600 having an opening part 6001 opening to the circumferential surface of the crossbar in each of the above described movable contact attachment parts 60.
  • the recess part 600 includes a through hole 601 penetrating from the above described opening part 6001 in a direction perpendicular to the shaft direction of the crossbar 6, and a pair of depressed parts 602, 603 having opening parts 6021, 6031 integrated with the opening part 6001 and respectively depressed in the shaft direction from both sides of the through hole 601 in the shaft direction.
  • the through hole 601 has an opening part 6012 opening to the circumferential surface of the crossbar 6 opposite to an opening part 6011, and a recessed groove 6013 extending from the middle of the through hole 601 to the above described opening part 6012.
  • the pair of depressed parts 602, 603 respectively have U-shaped spring holding walls 6022 that abut against the outer circumferential parts of a pair of coil spring parts 91, 92 of the contact pressure spring 9, which will be described later, and hold the outer diameters of the coil spring parts 91, 92, and flat wall surfaces 6023 continuing to the spring holding walls 6022.
  • the spring holding wall and the flat wall surface of the depressed part 603 are not shown in the drawing, however, they are formed similarly to the spring holding wall 6022 and the flat wall surface 6023 of the depressed part 602.
  • the interior spaces of the above described through hole 601 and pair of depressed parts 602, 603 communicate with each other as shown in the drawing.
  • Both side walls of the recessed groove 6013 provided in the above described through hole 601 bulge from both side walls of the through hole 601 toward inside of the through hole 601 via inclined surfaces 6014 (in FIG. 5 , only one side wall is shown, however, the other side wall is similarly formed).
  • the groove width of the recessed groove 6013 is formed to have dimensions to the degree slightly larger than the plate thickness dimension of the conducting member forming the movable contact 8, and accordingly, the recessed groove 6013 serves to control the movement of the crossbar 6 in the shaft direction in the movable contact 8.
  • the movable contact supporting member 10 includes the base part 11 fixed to the base 1 of the circuit breaker 100, the pair of connecting conductor parts 101, 102 raised vertically from the base part 11 with their edge parts opposed in parallel, and a pair of projecting parts 103 provided to respectively project from the wall surfaces opposed to each other of the pair of connecting conductor parts 101, 102 (in FIGs. 3 to 5 , only the root part 103 of the projecting part of the connecting conductor part 101 is shown).
  • the base part 11 of the movable contact supporting member 10 is electrically connected to the load side connecting conductor 41 when the above described load side connecting conductor 41 is inserted into the raised parts of the connecting conductor parts 101, 102 against the elastic force of the raised parts.
  • the movable contact 8 has one end to which the movable contact point 7 is fixed and a through hole 81 at the other end.
  • the above described pair of projecting parts respectively provided in the connecting conductor parts 101, 102 of the movable contact supporting member 10 are inserted from both side parts of the movable contact 8. Thereby, the other end of the movable contact 8 is rotatably supported by the movable contact supporting member 10.
  • the inner side surfaces of the connecting conductor parts 101, 102 of the movable contact supporting member 10 are slidably and electrically connected to both side surfaces of the movable contact 8. Accordingly, the configuration eliminates the necessity of connecting a shunt line of a flexible conductor between the movable contact 8 and the load side connecting conductor 41, and forms a so-called shuntless conduction connection structure.
  • the contact pressure spring 9 is formed as a double-torsion type torsion coil spring. That is, the contact pressure spring 9 includes the pair of coil spring parts 91, 92 as compression coil springs wound with pitches respectively having predetermined pitch angles, an arm-like spring part 93 that couples the one ends of the respective pairs of coil spring parts 91, 92 to each other, extends to the one end side of the movable contact 8 to abut against a rear surface 82 of the movable contact 8, and urges the movable contact 8 to provide the contact pressure, and a pair of leg parts 911, 921 that extend from the respective other ends of the pair of coil spring parts 91, 92 in a direction opposite to the one end side of the movable contact 8 and abut against the wall surfaces 6023 of the depressed parts 602, 603 when the contact pressure spring 9 is fitted in the depressed parts 602, 603.
  • the coil spring part 91 is pressed against the spring holding wall of the depressed part 603 in H direction and its outer diameter is held at point G. Therefore, without penetration of the shaft pins through the coil spring parts 91, 92 unlike the conventional case, the outer diameters of the coil spring parts 91, 92 can be held and they can be attached to the crossbar 6.
  • FIGs. 3 to 6 first, the other end of the movable contact 8 is inserted between the pair of connecting conductor parts 101, 102 of the movable contact supporting member 10, and, into the through hole 81 formed at the other end of the movable contact 8, the pair of projecting parts formed on the inner side surfaces of the pair of connecting conductor parts 101, 102 are inserted and fitted from both side parts of the movable contact 8.
  • the arm-like spring part 93 of the contact pressure spring 9 is allowed to abut against the rear surface 82 of the movable contact device 12 and the inner ends of the pair of coil spring parts 91, 92 of the contact pressure spring 9 in the shaft direction are allowed to abut against the outer surfaces of the pair of connecting conductor parts 101, 102 of the movable contact supporting member 10, respectively.
  • the contact pressure spring 9 is attached to the other end of the movable contact 8 and the movable contact supporting member 10 while the pair of connecting conductor parts 101, 102 of the movable contact supporting member 10 are sandwiched by the pair of coil spring parts 91, 92.
  • the outer ends of the pair of coil spring parts 91, 92 of the contact pressure spring 9 in the shaft direction are grasped and these coil spring parts 91, 92 are compressed against their spring forces, and, with the condition remaining, the movable contact 8 is inserted from the opening part 6001 of the crossbar 6 shown in FIG. 4 into the through hole 601 from its one end and the one end of the movable contact 8 is protruded through the through hole 601 out from the opening part 6012.
  • the contact pressure spring 9 is inserted from the respective opening parts 6021, 6031 into the pair of depressed parts 602, 603 of the crossbar 6 with the coil spring parts 91, 92 remaining compressed, and parts of the outer circumferential parts of the respective coil spring parts 91, 92 abut against the U-shaped spring holding walls 6022 of the respective depressed parts 602, 603.
  • the coil spring parts 91, 92 of the contact pressure spring 9 are inserted into the depressed parts 602, 603 and released from the above described grasp, they extend in the shaft direction by the spring forces, and the outer ends in their shaft direction abut against the side walls of the respective depressed parts 602, 603. Concurrently, the coil spring parts 91, 92 hold the compressed condition.
  • the inner ends of the contact pressure spring 9 in the shaft direction press the connecting conductor parts 101, 102 of the movable contact supporting member 10 toward both side surfaces of the movable contact 8.
  • the contact pressure as a shuntless contact part is kept between the movable contact 8 and the connecting conductor parts 101, 102 of the movable contact supporting member 10, and they are slidable and the electric connection is kept.
  • the movable contact device 12 for a circuit breaker according to Embodiment 1 of the invention can be attached to the crossbar 6 while the movable contact 8 and the movable contact supporting member 10 are connected, and the leg parts 911, 921 of the contact pressure spring 9 engage with the wall surfaces of the recess part only by the operation of compressing and inserting the coil spring parts 91, 92 of the contact pressure spring 9 into the recess part 600 of the crossbar 6, predetermined rotation moment for the movable contact 8 can be obtained, and thereby, the springing operation of the leg parts 911, 921 of the contact pressure spring after insertion of the contact pressure spring 9 becomes unnecessary and the assembly time can be shortened.
  • the invention can be used in a field of a circuit breaker such as a molded case circuit breaker or a molded case earth leakage circuit breaker.

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EP08808716.8A 2008-08-06 2008-08-06 Movable contactor device of circuit breaker Not-in-force EP2323155B1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/JP2008/064104 WO2010016114A1 (ja) 2008-08-06 2008-08-06 回路遮断器の可動接触子装置

Publications (3)

Publication Number Publication Date
EP2323155A1 EP2323155A1 (en) 2011-05-18
EP2323155A4 EP2323155A4 (en) 2013-11-13
EP2323155B1 true EP2323155B1 (en) 2016-11-09

Family

ID=41663344

Family Applications (1)

Application Number Title Priority Date Filing Date
EP08808716.8A Not-in-force EP2323155B1 (en) 2008-08-06 2008-08-06 Movable contactor device of circuit breaker

Country Status (4)

Country Link
EP (1) EP2323155B1 (zh)
JP (1) JP5134085B2 (zh)
CN (1) CN102047371B (zh)
WO (1) WO2010016114A1 (zh)

Families Citing this family (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JP5776327B2 (ja) * 2011-05-18 2015-09-09 富士電機機器制御株式会社 回路遮断器
CN103107050B (zh) * 2011-11-09 2017-06-30 河村电器产业株式会社 具备支承可动接触件的隔板的电路断路器
CN104303252B (zh) * 2012-05-15 2017-03-08 三菱电机株式会社 电路断路器
ITMI20131034A1 (it) * 2013-06-21 2014-12-22 Gewiss Spa Dispositivo di chiusura dei contatti di un interruttore
FR3020498B1 (fr) * 2014-04-24 2018-04-20 Hager-Electro Sas Dispositif a contact mobile sans tresse conductrice.
US9805895B2 (en) * 2015-11-17 2017-10-31 Eaton Corporation Electrical switching apparatus and clinch joint assembly therefor
CN111769015B (zh) * 2020-06-06 2022-11-04 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） 一种塑壳断路器多片式动触头及触头系统
CN114068225B (zh) * 2021-09-30 2024-09-06 浙江德力西国际电工有限公司 一种多控开关及多控电路系统

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS59178847U (ja) * 1983-05-16 1984-11-29 三菱電機株式会社 回路しや断器
JP3794163B2 (ja) * 1998-04-21 2006-07-05 三菱電機株式会社 回路遮断器
JP2000268697A (ja) * 1999-03-19 2000-09-29 Mitsubishi Electric Corp 回路遮断器の可動接触装置
JP3804352B2 (ja) 1999-08-26 2006-08-02 松下電工株式会社 回路遮断器の可動接触子装置
JP4399102B2 (ja) * 2000-12-26 2010-01-13 三菱電機株式会社 回路遮断器
JP4356267B2 (ja) * 2001-05-28 2009-11-04 富士電機機器制御株式会社 配線用回路しゃ断器
JP4321296B2 (ja) * 2004-02-19 2009-08-26 富士電機機器制御株式会社 反発形回路遮断器の接触子装置

Also Published As

Publication number Publication date
WO2010016114A1 (ja) 2010-02-11
CN102047371A (zh) 2011-05-04
CN102047371B (zh) 2013-07-03
JP5134085B2 (ja) 2013-01-30
EP2323155A4 (en) 2013-11-13
EP2323155A1 (en) 2011-05-18
JPWO2010016114A1 (ja) 2012-01-12

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