EP2849198B1 - Disjoncteur avec supports de fixation d'aimant - Google Patents

Disjoncteur avec supports de fixation d'aimant Download PDF

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Publication number
EP2849198B1
EP2849198B1 EP13184775.8A EP13184775A EP2849198B1 EP 2849198 B1 EP2849198 B1 EP 2849198B1 EP 13184775 A EP13184775 A EP 13184775A EP 2849198 B1 EP2849198 B1 EP 2849198B1
Authority
EP
European Patent Office
Prior art keywords
heater
magnet
circuit breaker
bimetal
magnet fixing
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.)
Active
Application number
EP13184775.8A
Other languages
German (de)
English (en)
Other versions
EP2849198A1 (fr
Inventor
Ki Ho Baek
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.)
LS Electric Co Ltd
Original Assignee
LSIS Co Ltd
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 LSIS Co Ltd filed Critical LSIS Co Ltd
Priority to ES13184775.8T priority Critical patent/ES2618052T3/es
Priority to EP13184775.8A priority patent/EP2849198B1/fr
Publication of EP2849198A1 publication Critical patent/EP2849198A1/fr
Application granted granted Critical
Publication of EP2849198B1 publication Critical patent/EP2849198B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

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Classifications

    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/14Electrothermal mechanisms
    • H01H71/16Electrothermal mechanisms with bimetal element
    • H01H71/164Heating elements
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02Housings; Casings; Bases; Mountings
    • H01H71/0207Mounting or assembling the different parts of the circuit breaker
    • HELECTRICITY
    • H01ELECTRIC ELEMENTS
    • H01HELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
    • H01H71/00Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/10Operating or release mechanisms
    • H01H71/12Automatic release mechanisms with or without manual release
    • H01H71/40Combined electrothermal and electromagnetic mechanisms
    • H01H71/402Combined electrothermal and electromagnetic mechanisms in which the thermal mechanism influences the magnetic circuit of the electromagnetic mechanism

Definitions

  • the present disclosure relates to a circuit breaker with a magnet fixing means, and more particularly, to a circuit breaker with a magnet fixing means for fixing a magnet used to suppress an overcurrent instantly being occurred.
  • a circuit breaker is an electrical device provided within a distribution switchboard having a low voltage circuit (15-30A) with AC 110/220V to be used for the purpose of preventing electric shock on human body, a fire caused by a short circuit, an accident due to an overcurrent and a short circuit, and the like.
  • Such a circuit breaker as a device for sensing a fault current when the fault current and short-circuit current occur and suppressing a line to protect the load and line connected thereto, is widely used instead of one combined with a knife switch and a fuse in the related art since it is small-sized and safely manipulated as well as has no trouble in inserting a fuse.
  • the fault current sensing function of the circuit breaker may include an overcurrent protection function and an instantaneous current protection function, and the overcurrent protection function performs a trip operation using a heater and a bimetal provided within the breaker by allowing the bimetal to be bent, and the instantaneous current protection function performs a trip operation using a magnet magnetized by an instantaneously generated high current.
  • the size and conduction time of current is variably set at which a trip operation should be carried out, and in case of a thermal electronic circuit breaker having the foregoing structure, it is set not to perform a trip operation when the current flows below 105% of rated current, but set to perform a trip operation above 130% of rated current. Furthermore, when the current flows above 105% and below 130%, a time for starting the trip operation is individually set according to the size of current.
  • FIG. 1 is a cross-sectional view illustrating the internal structure of a typical circuit breaker.
  • the foregoing bimetal 10, heater 11, and magnet 12 are fastened by one fixing bolt.
  • the heater 11 generates heat due to its induced current, and the generated heat is conducted into the bimetal 10.
  • heat enough to deform the bimetal 10 is generated, thereby suppressing the conduction of the overcurrent.
  • the magnet 12 is magnetized to pull an armature bar 13 disposed at the right side (with respect to FIG. 1 ) of the magnet 12 to the side of the magnet 12 to perform a trip operation.
  • US 2009/0295532 discloses a circuit breaker including a heater element including an elongated bimetal.
  • US 3 345 591 discloses an electric circuit breaker with tripping means including a heater strip in the thermal tripping means and adjustable air gaps in the magnetic tripping means.
  • WO 2013/126061 discloses a thermal magnetic-trip unit for a circuit breaker.
  • a further circuit breaker including a trip device is disclosed in KR 2004 0070544 .
  • the present disclosure is contrived to overcome the foregoing problems in the related art, and a technical task of the present disclosure is to provide a circuit breaker capable of constantly maintaining the operational characteristics of a circuit breaker.
  • Another technical task of the present disclosure is to provide a circuit breaker capable of allowing a bimetal to be accurately operated according to regulations such as a conduction time, a conduction current value, and the like.
  • a circuit breaker including a heater configured to generate heat due to a conduction current induced to a moving contact of the circuit breaker; a bimetal configured to be deformed due to heat generated by the heater to separate a contact point of the moving contact; a magnet configured to generate a magnetic force to move an armature bar when a current above a previously set reference current is induced; and a case configured to accommodate the bimetal and magnet, at least part of which is made of a synthetic resin material, there is provided the circuit breaker including a magnet fixing portion integrally formed in the case, and made of a synthetic resin material; a magnet fixing bolt configured to fasten the magnet to the magnet fixing portion; and a bimetal fixing bolt configured to fix the bimetal to the heater, wherein a separating portion exists between the magnet and the heater, and a bolt accomodating portion is formed at the heater to prevent the magnet fixing bolt from being brought into contact with the heater.
  • the circuit breaker may further include a heater fixing means configured to fix the heater to the trip case, wherein the heater fixing means is fastened to the magnet fixing portion.
  • a bimetal-side separating portion may be disposed between the heater and the bimetal.
  • the two separating portions may be respectively disposed on the remaining portion excluding the contact portion.
  • the magnet may be fixed to the magnet fixing portion. Further, the magnet may be spaced apart from the trip case except the end portion fixed to the magnet fixing portion.
  • an interference avoidance portion for accommodating part of the magnet fixing means may be formed at the heater.
  • a heater and a magnet may be separated from each other and individually fastened, thereby minimizing an amount of heat transferred from the heater to the magnet, and accordingly, constantly maintaining the operational characteristics of a bimetal.
  • the magnet may be fastened to a magnet fixing portion made of a synthetic resin material having a low thermal conductivity, and a magnet-side separating portion may be disposed between the heater and the magnet, thereby further minimizing the amount of heat conducted from the heater.
  • a bimetal-side separating portion may be also provided between the heater and the bimetal, thereby minimizing the deformation and positional discrepancy and the like of the bimetal due to the expansion of the heater.
  • only one side end portion of the magnet may be fastened to the magnet fixing portion, thereby minimizing a thermal conduction path connected from the heater to the magnet.
  • FIG. 2 is a partial cross-sectional view illustrating the internal structure of a circuit breaker according to an embodiment of the present disclosure
  • FIG. 3 is an enlarged partial cross-sectional view illustrating part of the embodiment illustrated in FIG. 2
  • the embodiment 100 may include a case 102 on which a switch is rotatably provided to selectively switch a current supplied from the power side to the load side, a moving contact 104 rotatably provided within the case 102, on an end portion of which there is provided a contact point of the current, and a bimetal 106 connected to the moving contact 104 through a lead line.
  • the case 102 is an injection molded part made of a synthetic resin material, which functions as an enclosure of the circuit breaker.
  • a gap between the first fix contact and the second fix contact is electrically connected or disconnected while rotating the moving contact 104, and FIG. 1 illustrates a state in which the moving contact is not brought into contact with the first and the second fix contact, namely, a disconnecting state.
  • Atrip assembly 112 configured to actuate the moving contact and a driving mechanism 114 mechanically connected to the trip assembly to drive the trip assembly are additionally provided within the case 102.
  • the driving mechanism 114 may include a plurality of nails 116 mechanically connected to the trip assembly 112.
  • the trip assembly 112 may include a rotatably fixed shooter 118, and the shooter 118 transfers power between the nail 116 and a crossbar 120.
  • a magnet fixing portion 130 provided as an integral or individual element with the case 102 is provided within the case 102.
  • the magnet fixing portion 130 is made of a synthetic resin material, and part of an element contained in the trip assembly 112 is fixed thereto.
  • a heater 140 for generating heat to deform the bimetal 106 when an overcurrent flows is fixed to an upper surface of the magnet fixing portion 130.
  • the heater 140 is immovably fixed to the magnet fixing portion 130 by the heater fixing bolt 142, and a lower end portion of the bimetal 106 is fixed to heater 140 by a bimetal fixing bolt 144.
  • the heater 140 is in a state of being brought into contact with the bimetal at a portion adjacent to the bimetal fixing bolt 144, but separated from the bimetal 106 at the remaining portion to form a bimetal-side separating portion (G1).
  • an armature bar 150 for rotating the crossbar 120 is provided at the right side of the bimetal 106, and a magnet 160 formed of a ferromagnetic substance to generate a magnetic force using a current flowing through the heater 140 so as to pull the armature bar 150 is provided at the left side of the heater 140.
  • the magnet 160 is fixed to the magnet fixing portion 130 by a magnet fixing bolt 162.
  • the magnet 160 is merely brought into contact with the magnet fixing bolt 162 and the magnet fixing portion 130 but not brought into contact with other elements in the remaining portion.
  • a separating portion (G) exists between the heater 140 and the magnet 160, and thus it is seen that the paths of transferring heat generated from the heater directly to the side of the magnet 160 are all suppressed.
  • a bolt accommodating portion 146 is formed at the heater 140 to pass therethrough.
  • the bolt accommodating portion 146 is formed to be larger than the head portion of the magnet fixing bolt 162 not to allow the heater to be brought into contact with the fixing bolt, and a tool such as a driver or the like can be approached to the side of the magnet fixing bolt.
  • heat generation is carried out in the heater 140 when an overcurrent flows, and accordingly, heat is conducted to the bimetal 106 in contact therewith.
  • the conducted heat reaches a degree sufficient to bend the bimetal
  • the crossbar 120 is rotated while bending the bimetal 106.
  • the driving mechanism 114 is mechanically connected to the moving contact 104 to rotate the moving contact 104, and thus the circuit is open.
  • the bimetal can be correctly operated according to the intention at the time of the design. In other words, the bimetal can be operated according to the conduction time and conduction current.
  • the magnet is made of a synthetic resin material.
  • the bimetal-side separating portion (G1) performs the role of preventing the bimetal from being deformed while the heater is expanded due to heat.
  • the expanded heater may push the bimetal to dislocate the position of the bimetal, but the expanded amount of the heater can be absorbed since there exists the bimetal-side separating portion (G1).

Landscapes

  • Physics & Mathematics (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)
  • Thermally Actuated Switches (AREA)

Claims (6)

  1. Disjoncteur comprenant : un élément chauffant (140) configuré pour générer de la chaleur du fait d'un courant de conduction induit pour un contact mobile (104) du disjoncteur ; un bilame (106) configuré pour être déformé du fait de la chaleur générée par l'élément chauffant (140) pour séparer un point de contact du contact mobile (104) ; un aimant (160) configuré pour générer une force magnétique pour déplacer une barre d'armature (150) lorsqu'un courant supérieur à un courant de référence précédemment réglé est induit ; et un boîtier (102) configuré pour héberger le bilame (106) et l'aimant (160), caractérisé en ce qu'au moins une partie du boîtier (102) est constituée d'un matériau de résine synthétique, et en ce que le disjoncteur comprend en outre :
    une partie de fixation d'aimant (130) intégralement formée dans le boîtier (102) et constituée d'un matériau de résine synthétique ;
    l'élément chauffant (140) étant fixé à la partie de fixation d'aimant (130) grâce à un boulon de fixation d'élément chauffant (142) ;
    l'aimant (160) étant fixé à la partie de fixation d'aimant (130) grâce à un boulon de fixation d'aimant (162) ; et
    un boulon de fixation de bilame (144) étant configuré pour fixer le bilame (106) à l'élément chauffant (140),
    dans lequel une partie de séparation (G) existe entre l'élément chauffant (140) et l'aimant (160), et
    une partie d'hébergement de boulon (146) étant formée au niveau de l'élément chauffant (140) pour empêcher que le boulon de fixation d'aimant (162) ne soit mis en contact avec l'élément chauffant (140).
  2. Disjoncteur selon la revendication 1, dans lequel :
    le boulon de fixation d'élément chauffant (142) est configuré pour fixer l'élément chauffant (140) au boîtier (102),
    dans lequel le boulon de fixation d'élément chauffant (142) est attaché à la partie de fixation d'aimant (130).
  3. Disjoncteur selon la revendication 1, dans lequel une partie de séparation (G1) du côté bilame est disposée entre l'élément chauffant (140) et le bilame (106).
  4. Disjoncteur selon la revendication 3, dans lequel les deux parties de séparation (G, G1) sont respectivement disposées sur la partie restante en excluant la partie de contact.
  5. Disjoncteur selon la revendication 1, dans lequel seulement une partie d'extrémité latérale de l'aimant (160) est fixée à la partie de fixation d'aimant (130).
  6. Disjoncteur selon la revendication 5, dans lequel l'aimant (160) est espacé par rapport au boîtier (102) à l'exception de la partie d'extrémité fixée à la partie de fixation d'aimant (130).
EP13184775.8A 2013-09-17 2013-09-17 Disjoncteur avec supports de fixation d'aimant Active EP2849198B1 (fr)

Priority Applications (2)

Application Number Priority Date Filing Date Title
ES13184775.8T ES2618052T3 (es) 2013-09-17 2013-09-17 Disyuntor con medios de fijación magnética
EP13184775.8A EP2849198B1 (fr) 2013-09-17 2013-09-17 Disjoncteur avec supports de fixation d'aimant

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
EP13184775.8A EP2849198B1 (fr) 2013-09-17 2013-09-17 Disjoncteur avec supports de fixation d'aimant

Publications (2)

Publication Number Publication Date
EP2849198A1 EP2849198A1 (fr) 2015-03-18
EP2849198B1 true EP2849198B1 (fr) 2016-12-21

Family

ID=49170624

Family Applications (1)

Application Number Title Priority Date Filing Date
EP13184775.8A Active EP2849198B1 (fr) 2013-09-17 2013-09-17 Disjoncteur avec supports de fixation d'aimant

Country Status (2)

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EP (1) EP2849198B1 (fr)
ES (1) ES2618052T3 (fr)

Families Citing this family (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN109920706A (zh) * 2019-04-16 2019-06-21 天津加美特电气设备有限公司 一种n极不带灭弧装置的断路器

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3345591A (en) * 1966-06-29 1967-10-03 Square D Co Electric circuit breaker with improved tripping means including a heater strip in the thermal tripping means and adjustable air gaps in the magnetic tripping means
KR100479434B1 (ko) * 2003-02-04 2005-03-31 엘지산전 주식회사 배선용 차단기의 트립장치
US7800478B2 (en) * 2008-05-30 2010-09-21 Eaton Corporation Electrical switching apparatus and heater assembly therefor
WO2013126061A1 (fr) * 2012-02-23 2013-08-29 Siemens Aktiengesellschaft Éléments chauffants pour disjoncteur et systèmes magnétiques translationnels

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
None *

Also Published As

Publication number Publication date
ES2618052T3 (es) 2017-06-20
EP2849198A1 (fr) 2015-03-18

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