EP4117010A1 - Disjoncteur miniature - Google Patents

Disjoncteur miniature Download PDF

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Publication number
EP4117010A1
EP4117010A1 EP21765252.8A EP21765252A EP4117010A1 EP 4117010 A1 EP4117010 A1 EP 4117010A1 EP 21765252 A EP21765252 A EP 21765252A EP 4117010 A1 EP4117010 A1 EP 4117010A1
Authority
EP
European Patent Office
Prior art keywords
moving contact
circuit breaker
temperature control
partition plate
thermal tripping
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.)
Pending
Application number
EP21765252.8A
Other languages
German (de)
English (en)
Other versions
EP4117010A4 (fr
Inventor
Zaiwei CHEN
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.)
Zhejiang Chint Electrics Co Ltd
Original Assignee
Zhejiang Chint Electrics 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 Zhejiang Chint Electrics Co Ltd filed Critical Zhejiang Chint Electrics Co Ltd
Publication of EP4117010A1 publication Critical patent/EP4117010A1/fr
Publication of EP4117010A4 publication Critical patent/EP4117010A4/fr
Pending 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
    • H01H71/00—Details of the protective switches or relays covered by groups H01H73/00 - H01H83/00
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • 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
    • H01H71/02—Housings; Casings; Bases; Mountings
    • H01H71/0207—Mounting or assembling the different parts of the circuit breaker
    • H01H71/0221—Majority of parts mounted on central frame or wall
    • 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/505—Latching devices between operating and release 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
    • H01H71/50—Manual reset mechanisms which may be also used for manual release
    • H01H71/52—Manual reset mechanisms which may be also used for manual release actuated by lever
    • H01H71/526—Manual reset mechanisms which may be also used for manual release actuated by lever the lever forming a toggle linkage with a second lever, the free end of which is directly and releasably engageable with a contact structure

Definitions

  • the present invention relates to the technical field of low-voltage electrical appliances, and more particularly to a miniature circuit breaker.
  • An objective of the present invention is to overcome the defects of the prior art and provide a miniature circuit breaker with a simple structure and high reliability.
  • a miniature circuit breaker comprising a housing and a handle arranged on the housing, wherein an overload protection device and an operating mechanism connected to a moving contact are arranged in the housing;
  • the overload protection device comprises a temperature control assembly equipped with a bimetal sheet; an incoming wire connecting terminal connected to the moving contact is arranged on one side, close to the moving contact, inside the housing; a static contact matched with the moving contact is arranged on one side of the moving contact, and the temperature control assembly is arranged on the other side of the moving contact;
  • the overload protection device further comprises a temperature control protection device; when overloaded, the temperature control assembly drives the temperature control protection device arranged on the housing to trigger the circuit breaker to trip; and the temperature control protection device comprises a partition plate and a thermal tripping rod, wherein the thermal tripping rod can be rotated on the partition plate to trigger the circuit breaker to trip; the partition plate separates the moving contact and the thermal tripping rod in two different planes; the temperature control
  • the temperature control assembly further comprises a support on which the bimetal sheet and the current-carrying conductor are fixedly arranged; one end of the support is connected to a fixed end of the bimetal sheet, and the other end of the support forms a bifurcated structure with the movable end of the bimetal sheet; and the other end of the support is used for connection with an adjusting member arranged on one side of the housing.
  • the partition plate is provided with a first critical point, a second critical point and a limiting portion, wherein the first critical point and the second critical point are used for being in limiting fit with the thermal tripping rod; the middle part of the thermal tripping rod is rotatably mounted on the partition plate; one end of the thermal tripping rod is used as an unlocking end to pass through a gap between the first critical point and the second critical point and to cooperate with an operating mechanism; the other end of the thermal tripping rod is used as a driving end to cooperate with the movable end of the bimetal sheet; and the limiting portion is used for being in limiting fit with the bimetal sheet.
  • the partition plate is of a right-angled triangle as a whole; a mandrel for the thermal tripping rod to be rotatably mounted is arranged on the upper part of the partition plate; two protrusions are arranged on one side of the mandrel close to the operating mechanism as the first critical point and the second critical point, respectively, wherein the first critical point is located on one side close to the temperature control assembly, and the second critical point is located on one side away from the temperature control assembly; a longitudinal rib is arranged on the partition plate, wherein a groove serving as a limiting portion is formed in the middle of the rib; and the movable end of the bimetal sheet passes through the groove and used for cooperating with the driving end of the thermal tripping rod.
  • the current-carrying conductor comprises a current-carrying plate, a first flexible conductor and a second flexible conductor; one end of the current-carrying plate is connected to the incoming wire connecting terminal, and the other end of the current-carrying plate is connected to the second flexible conductor; the first flexible conductor is connected to the moving contact; the first flexible conductor is connected to the second flexible conductor; and one end of the first flexible conductor is connected to the bimetal sheet, and the other end of the first flexible conductor is connected to the moving contact.
  • the middle part of the thermal tripping rod is circular and is used for rotational connection with the partition plate; one end of the thermal tripping rod is used as the driving end to cooperate with the movable end of the bimetal sheet; the end part of the driving end is bluntly rounded; the other end of the thermal tripping rod is used as the unlocking end, and the end part of the other end is bent to one side for triggering the circuit breaker to trip.
  • the partition plate is of a right-angled triangle as a whole;
  • the thermal tripping rod is rotatably mounted on the upper part of the partition plate; one end of the thermal tripping rod is used as the unlocking end to extend out of the partition plate and to cooperate with the operating mechanism, and the other end of the thermal tripping rod is used as the driving end to be located in the middle of the partition plate;
  • the temperature control assembly comprises a bimetal sheet, a current-carrying conductor and a support, wherein the support is used to fix the current-carrying conductor and the bimetal sheet between the incoming wire connecting terminal and the moving contact; the movable end of the bimetal sheet extends to the driving end on the partition plate for driving the driving end ofthe thermal tripping rod;
  • the support is obliquely arranged along a hypotenuse edge of the partition plate and used for connection with the adjusting member on one side of the housing; and the adjusting member is inclined toward the hypotenuse of the partition plate.
  • the operating mechanism comprises a contact support, and a jump buckle and a lock catch which are pivotally arranged on the contact support, respectively; the contact support is connected to the moving contact; the jump buckle and one end of the lock catch are lapped and connected to each other; a connecting rod for connection with the handle is arranged at the other end of the jump buckle; and an unlocking portion that cooperates with the thermal tripping rod is arranged at the other end of the lock catch.
  • the unlocking portion is located at the edge of one side of the lock catch close to the incoming wire connecting terminal; the unlocking portion is of a protruding structure that protrudes from the edge of the lock catch; an arc-striking plate for introducing an electric arc into an arc-extinguishing chamber is also arranged on the current-carrying conductor; and the arc-striking plate and the moving contact are located on the same plane.
  • the housing is provided with the arc extinguishing chamber inside, wherein the arc extinguishing chamber is located on one side of the moving contact away from the temperature control assembly, and is located below the static contact; and the partition plate is located on one side of the arc extinguishing chamber close to the moving contact.
  • the miniature circuit breaker of the present invention does not need to perform current shunting on a temperature control assembly, only by additionally providing the partition plate in the housing and arranging the moving contact and the thermal tripping rod in two different planes respectively, the bimetal sheet that is originally in the same plane as the moving contact is also in two planes with the moving contact under the separation of the partition plate.
  • the temperature control assembly is then mounted in a space close to the moving contact, which shortens the length of the current-carrying conductor of the temperature control assembly, reduces the internal resistance and reduces heat generation, thereby avoiding a damage to parts caused by the overheating of the temperature control assembly.
  • the circuit breaker will not be interfered by the thermal tripping rod during normal operation under the restriction of the first critical point and the second critical point, wherein the limiting portion is used to limit a movement range of the bimetal sheet to avoid interfering the normal operation of the circuit breaker.
  • the specific implementation of the miniature circuit breaker of the present invention will be further described below with reference to the embodiments given in FIGS. 1 to 7 .
  • the miniature circuit breaker of the present invention is not limited to the description of the following embodiments.
  • a miniature circuit breaker comprising a housing 1 and a handle 2 arranged on the housing 1, wherein an overload protection device and an operating mechanism connected to a moving contact 8 are arranged in the housing 1;
  • the overload protection device comprises a temperature control assembly equipped with a bimetal sheet 61; an incoming wire connecting terminal connected to the moving contact 8 is arranged on one side, close to the moving contact 8, inside the housing 1; a static contact matched with the moving contact 8 is arranged on one side of the moving contact 8, and the temperature control assembly is arranged on the other side of the moving contact 8;
  • the overload protection device further comprises a temperature control protection device; when overloaded, the temperature control assembly drives the temperature control protection device arranged on the housing 1 to trigger the circuit breaker to trip; and
  • the temperature control protection device comprises a partition plate 41 and a thermal tripping rod 42, wherein the thermal tripping rod 42 can be rotated on the partition plate 41 to trigger the circuit breaker to trip; the partition plate 41 separates the moving contact 8 and the thermal tripping rod 42 in
  • the miniature circuit breaker of the present invention does not need to perform current shunting on a temperature control assembly, and the operating mechanism, the overload protection device, and the moving contact 8 are all located in the same cavity of the housing 1, by additionally providing the partition plate 41 in the housing 1 and arranging the moving contact 8 and the thermal tripping rod 42 in two different planes respectively, the bimetal sheet 61 that is originally in the same plane as the moving contact 8 is also in two planes with the moving contact 8 under the separation of the partition plate 41.
  • the temperature control assembly is then mounted in a space close to the moving contact 8, which shortens the length of the current-carrying conductor of the temperature control assembly, reduces the internal resistance and reduces heat generation, thereby avoiding a damage to parts caused by the overheating of the temperature control assembly.
  • a miniature circuit breaker includes a housing 1 and a handle 2 arranged on the housing 1, wherein an overload protection device and an operating mechanism connected to a moving contact 8 are arranged in the housing 1;
  • the overload protection device includes a temperature control assembly equipped with a bimetal sheet 61, and a temperature control protection device;
  • the operating mechanism includes a contact support, and a jump buckle 31 and a lock catch 32 which are pivotally arranged on the contact support respectively; the contact support is connected to the moving contact 8; the jump buckle 31 and one end of the lock catch 32 are lapped and connected to each other; a connecting rod 33 for connection with the handle 2 is arranged at the other end of the jump buckle 31; the handle 2 and the operating mechanism are located at the upper part of the housing 1; a static contact that cooperates with the moving contact 8 is arranged on one side of the moving contact 8; the static contact is arranged on a static contact plate 9; the temperature control assembly is arranged on the other side of the moving contact 8; an overload protection device and an operating mechanism connected to a
  • the bimetal sheet 61 When the circuit breaker is overloaded, the bimetal sheet 61 is heated and bent, such that a movable end 611 of the bimetal sheet 61 drives the thermal tripping rod 42 to rotate to trigger the operating mechanism to trip and cut off; and the movable end 611 of the bimetal sheet 61 is located above the partition plate 41.
  • the tripping rod cooperates with the lock catch 32 of the operating mechanism, the jump buckle 31 and the lock catch 32 of the operating mechanism are lapped and connected to each other, and the thermal tripping rod 42 rotates to drive the lock catch 32 to rotate, such that the lock catch 32 releases the lapped connection from the jump buckle 31, thereby tripping and cutting off the circuit breaker.
  • the significance of adding the partition plate 41 in the housing 1 is to fully separate a space near the moving contact 8 and increase its space utilization rate, such that the temperature control assembly is mounted on the space near the moving contact 8.
  • the temperature control assembly can also be mounted near the moving contact 8 by increasing a size of the housing 1 to increase the space between the moving contact 8 and the incoming wire connecting terminal, but this is not conducive to the miniaturized design of the circuit breaker.
  • said incoming wire connecting terminal and outgoing wire connecting terminal can be adjusted as the outgoing wire connecting terminal and the incoming wire connecting terminal according to the change in the user's wiring mode.
  • the temperature control assembly specifically includes a bimetal sheet 61, a current-carrying conductor and a support 63, wherein the support 63 is used to fix the current-carrying conductor and the bimetal sheet 61 between the incoming wire connecting terminal and the moving contact 8; one end of the support 63 is connected to a fixed end of the bimetal sheet 61, and the other end of the support 63 forms a bifurcated structure with the movable end 611 of the bimetal sheet 61, the other end of the support 63 is used for connection with an adjusting member 7 arranged on one side of the housing 1, and preferably, the support 63 is obliquely arranged along a hypotenuse edge of the partition plate 41 and used for connection with the adjusting member 7 on one side of the housing 1; and the adjusting member 7 is obliquely arranged toward the hypotenuse of the partition plate 41, which further shortens the length of the support 63.
  • the current-carrying conductor includes a current-carrying plate 623, a first flexible conductor 621 and a second flexible conductor 622; one end of the current-carrying plate 623 is connected to the incoming wire connecting terminal, and the other end of the current-carrying plate 623 is connected to the second flexible conductor 622; the first flexible conductor 621 is connected to the moving contact 8; and one end of the first flexible conductor 621 is connected to the bimetal sheet 61, and the other end of the first flexible conductor 621 is connected to the moving contact 8.
  • the first flexible conductor 621 and the second flexible conductor 622 can be combined into one flexible conductor.
  • This flexible conductor only needs to connect the current-carrying plate 623, the movable contact 8 and the bimetal sheet 61 together, and its specific form is not limited.
  • the movable end 611 of the bimetal sheet 61 extends to the driving end 422 on the partition plate 41 for driving the thermal tripping rod 42.
  • an arc-striking plate 64 for introducing an electric arc into the arc extinguishing chamber is connected to the current-carrying conductor, and the arc-striking plate 64 is in the same plane as the moving contact 8.
  • the adjusting member 7 is a screw.
  • the partition plate 41 is specifically shown in FIG. 6 .
  • the partition plate 41 is provided with a first critical point 411, a second critical point 412 and a limiting portion 413, wherein the first critical point 411 and the second critical point 412 are used for being in limiting fit with the thermal tripping rod 42. Under the limiting action of the first critical point 411 and the second critical point 412, the thermal tripping rodwill not interfere with the operating mechanism when the circuit breaker works normally.
  • the middle part of the thermal tripping rod 42 is rotatably mounted on the partition plate 41; one end of the thermal tripping rod 42 is used as an unlocking end 421 to pass through a gap between the first critical point 411 and the second critical point 412 and to cooperate with an operating mechanism; the other end of the thermal tripping rod 42 is used as a driving end 422 to cooperate with the movable end 611 of the bimetal sheet 61; and the limiting portion 413 is used for being in limiting fit with the bimetal sheet 61.
  • the bimetal sheet 61 is bent within a limited space under the action of the limiting portion 413, and the limiting space of the limiting portion 413 is related to a bending degree of the bimetal sheet 61 when overloaded.
  • the partition plate 41 is of a right-angled triangle as a whole; a mandrel for the thermal tripping rod 42 to be rotatably mounted is arranged on the upper part of the partition plate 41; two protrusions are arranged on one side of the mandrel close to the operating mechanism as the first critical point 411 and the second critical point 412, respectively, wherein the first critical point 411 is located on one side close to the temperature control assembly, and the second critical point 412 is located on one side away from the temperature control assembly.
  • the thermal tripping rod 42 When the circuit breaker is not overloaded, the thermal tripping rod 42 is located on one side close to the first critical point 411; and when the circuit breaker is overloaded, the thermal tripping rod 42 is driven by the bimetal sheet 61 to approach the second critical point 412, and meanwhile, the unlocking end 421 of the thermal tripping rod 42 trips the operating mechanism, thereby tripping and cutting off the circuit breaker.
  • a longitudinal rib is arranged on the partition plate 41, wherein a groove serving as a limiting portion 413 is formed in the middle of the rib; and the movable end 611 of the bimetal sheet 61 passes through the groove and is used for cooperating with the driving end 422 of the thermal tripping rod 42.
  • a comb-shaped groove which is used for cooperating with an arc-extinguishing grate of the arc-extinguishing chamber to adjust an air pressure of the arc-extinguishing chamber is formed in a right-angle side on one side of the partition plate 41 close to the arc-extinguishing chamber.
  • a circular groove that is mounted in cooperation with the static contact is formed above the comb-shaped groove.
  • the arc-extinguishing chamber is located on one side of the moving contact 8 away from the temperature control assembly, and is located below the static contact.
  • the moving contact 8 swings so that the moving contact at one end is in contact with or separated from a static contact point on the static contact.
  • the static contact point extends to an arc entry side of the arc extinguishing chamber.
  • the partition plate 41 is located on one side of the arc-extinguishing chamber close to the moving contact 8, and corresponds to a swing space of the moving contact 8.
  • the thermal tripping rod 42 mounted on the partition plate 41 is preferably as shown in FIGS. 2-4 .
  • the thermal tripping rod 42 is a rod body with one thick end and one thin end.
  • the middle part of the thermal tripping rod 42 is circular and is used for rotational connection with the partition plate 41; one thin end of the thermal tripping rod 42 is used as the driving end 422 to cooperate with the movable end 611 of the bimetal sheet 61; the end part of the driving end 422 is bluntly rounded; and the thick end of the thermal tripping rod 42 is used as the unlocking end 421, and the end part of the thick end is bent to one side for triggering the circuit breaker to trip.
  • an unlocking portion 321 which cooperates with the unlocking end 421 of the thermal tripping rod 42 is arranged at one end of the lock catch 32 of the operating mechanism.
  • the unlocking portion 321 is located on an edge of one side of the lock catch 32 close to the incoming wire connecting terminal, and the unlocking portion 321 is of a protruding structure that protrudes from the edge of the lock catch 32.
  • the unlocking end 421 of the thermal tripping rod 42 is located on the side opposite to the unlocking portion 321.

Landscapes

  • Breakers (AREA)
  • Cookers (AREA)
  • Electronic Switches (AREA)
  • Electrophonic Musical Instruments (AREA)
EP21765252.8A 2020-03-06 2021-02-12 Disjoncteur miniature Pending EP4117010A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
CN202010152847.7A CN113363120A (zh) 2020-03-06 2020-03-06 小型断路器
PCT/CN2021/076633 WO2021175113A1 (fr) 2020-03-06 2021-02-12 Disjoncteur miniature

Publications (2)

Publication Number Publication Date
EP4117010A1 true EP4117010A1 (fr) 2023-01-11
EP4117010A4 EP4117010A4 (fr) 2024-04-10

Family

ID=77524130

Family Applications (1)

Application Number Title Priority Date Filing Date
EP21765252.8A Pending EP4117010A4 (fr) 2020-03-06 2021-02-12 Disjoncteur miniature

Country Status (5)

Country Link
EP (1) EP4117010A4 (fr)
CN (1) CN113363120A (fr)
AU (1) AU2021229961B2 (fr)
WO (1) WO2021175113A1 (fr)
ZA (1) ZA202208519B (fr)

Family Cites Families (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5258465U (fr) * 1975-10-24 1977-04-27
US4419649A (en) * 1981-11-04 1983-12-06 Westinghouse Electric Corp. Circuit breaker for use on AC and DC circuits
CN201015109Y (zh) * 2007-02-15 2008-01-30 黄华道 小型断路器
KR20150118460A (ko) * 2014-04-14 2015-10-22 엘에스산전 주식회사 가정용 회로차단기
CN107993897B (zh) * 2017-12-12 2024-08-06 上海电科电器科技有限公司 漏电保护断路器
CN109727826B (zh) * 2018-12-28 2024-08-13 浙江正泰电器股份有限公司 小型断路器
CN209981142U (zh) * 2019-02-15 2020-01-21 浙江正泰电器股份有限公司 断路器
CN211828666U (zh) * 2020-03-06 2020-10-30 浙江正泰电器股份有限公司 小型断路器

Also Published As

Publication number Publication date
AU2021229961A1 (en) 2022-08-25
EP4117010A4 (fr) 2024-04-10
ZA202208519B (en) 2023-03-29
WO2021175113A1 (fr) 2021-09-10
AU2021229961B2 (en) 2023-08-17
CN113363120A (zh) 2021-09-07

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