CN203103243U - Instantaneous tripping mechanism for miniature circuit breaker - Google Patents

Instantaneous tripping mechanism for miniature circuit breaker Download PDF

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Publication number
CN203103243U
CN203103243U CN2012207111961U CN201220711196U CN203103243U CN 203103243 U CN203103243 U CN 203103243U CN 2012207111961 U CN2012207111961 U CN 2012207111961U CN 201220711196 U CN201220711196 U CN 201220711196U CN 203103243 U CN203103243 U CN 203103243U
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CN
China
Prior art keywords
release lever
circuit
magnet
circuit breaker
bimetallic plates
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.)
Expired - Fee Related
Application number
CN2012207111961U
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Chinese (zh)
Inventor
金庆中
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
LS Industrial Systems 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 LS Industrial Systems Co Ltd filed Critical LS Industrial Systems Co Ltd
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Publication of CN203103243U publication Critical patent/CN203103243U/en
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    • 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
    • H01H37/00—Thermally-actuated switches
    • H01H37/02—Details
    • H01H37/32—Thermally-sensitive members
    • H01H37/52—Thermally-sensitive members actuated due to deflection of bimetallic 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
    • H01H71/10—Operating or release mechanisms
    • H01H71/12—Automatic release mechanisms with or without manual release
    • H01H71/24—Electromagnetic mechanisms
    • H01H71/32—Electromagnetic mechanisms having permanently magnetised part
    • 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
    • H01H73/22—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 having electrothermal release and no other automatic release
    • H01H73/30—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 having electrothermal release and no other automatic release reset by push-button, pull-knob or slide
    • H01H73/303—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 having electrothermal release and no other automatic release reset by push-button, pull-knob or slide with an insulating body insertable between the contacts when released by a 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
    • H01H71/10—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
    • H01H2071/168—Provisions for avoiding permanent deformation and thus decalibration of bimetal, e.g. due to overheating or action of a magnet

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  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Electromagnetism (AREA)
  • Breakers (AREA)

Abstract

The utility model relates to an instantaneous tripping mechanism for a miniature circuit breaker. According to one aspect of the utility model, the instantaneous tripping mechanism comprises a tripping rod, a double metal plate, a first magnet and a second magnet, wherein the tripping rod can rotate by taking one side as a center and move to a tripping position; and the tripping rod can move to a release position where a switching mechanism of the miniature circuit breaker is released and a restriction position where the switching mechanism is restrained; the double metal plate is electrically connected to a circuit and bends toward the tripping rod side when abnormal current occurs in the circuit so as to enable the tripping rod to move to the release position; the first magnet is conductively connected to the circuit and installed at the position adjacent to the double metal plate, and magnetized when abnormal current occurs in the circuit so as to enable the double metal plate to bend; and the second magnet is combined with the tripping rod, and enables bending of the double metal plate to be accelerated when abnormal current occurs in the circuit. The instantaneous tripping mechanism of the miniature circuit breaker has the beneficial effect of ability of shortening the time of instantaneous tripping.

Description

The instantaneous trip mechanism of miniature circuit breaker
Technical field
The utility model relates to miniature circuit breaker, claims the household electricity circuit breaker again, relates in particular to the instantaneous trip mechanism of miniature circuit breaker.
Background technology
Miniature circuit breaker claims the household electricity circuit breaker again; be a kind of small-sized low voltage power equipment; usually be installed on the electric power access portion of family; open and close home-use single-phase two-wire system circuit; or when the fault current that takes place on the circuit such as overcurrent or short circuit current this situation of perception; automatically cut off power circuit in the family, thereby protection power circuit and load equipment are not subjected to the accident current affects.
Below with reference to Fig. 1 to Fig. 5, the instantaneous trip mechanism of this miniature circuit breaker and corresponding miniature circuit breaker is described.
As shown in Figure 1, miniature circuit breaker 100 generally comprises switching mechanism 10 and instantaneous trip mechanism 20.
Switching mechanism 10 can comprise: fixed contact 10b, and it is electrically connected in the mains side of family's power circuit (house wiring), that is and, electric power inserts side; Moving contact 10a, the load-side that it is electrically connected in described power circuit, have contact fixed contact 10b and power circuit (house wiring) form "on" position closed circuit position (claim not only ON position), comprise from fixed contact 10b separate and power circuit (house wiring) from the position (but also claiming the OFF position) of mains side hand off or the open-circuit position of the dropout position of automatic cut-out (dropout); And as moving contact 10a the driven for opening and closing extremely handle, lever (LEVER), connecting rod (LINK), dropout spring (TRIP SPRING), snap close (LATCH) etc. of the mechanism of described closed circuit position or open-circuit position.
When the big fault current that in family's power circuit (house wiring), taken place such as overcurrent, short circuit current, as this situation of perception and the mechanism that makes described switching mechanism 10 open to described open-circuit position or switching mechanism 10 is retrained, as shown in the figure, instantaneous trip mechanism 20 can comprise bimetallic plates 21, release lever 23, adjust screw 22, electromagnet 24.
Bimetallic plates 21 are to make a side of close the release lever 23 with different thermal coefficient of expansion and away from two board amalgamations of a side of release lever 23, particularly away from the thermal coefficient of expansion of the side plate portion of release lever 23 greater than side plate portion near release lever 23, thereby when thermal expansion, to release lever 23 lateral bending songs.When bimetallic plates 21 flow through fault current on described power circuit, to release lever 23 lateral bending songs.
When aforesaid bending, bimetallic plates 21 promote release levers 23 by adjusting screw 22, make release lever 23 move to the off-position, so that make switching mechanism 10 move to described open-circuit position.
As shown in Figure 4, release lever 23 is as the member of capitalization " Y " shape, having the axle accommodation section 23a that can hold the rotation axis (not shown) in the bottom, can be that rotate at the center with described rotation axis, is installed on opposite to each other in the motion track of bimetallic plates 21 with bimetallic plates 21.
In addition, release lever 23 comprises the top 23c that is divided into two, is disposed at the main part 23b between top 23c and the described axle accommodation section 23a.
The main part 23b of release lever 23 has the snap close restraint slot 23b1 that the described snap close to switching mechanism 10 retrains or discharges.
At two the top 23c of being divided into of release lever 23, have respectively for adjust screw 22 threadably in conjunction with and screw hole (threaded opening) 23c1 that connects.
A pair of adjustment screw 22 combines threadably with the screw hole 23c1 of release lever 23, installs to such an extent that can adjust distance with in opposite directions bimetallic plates 21.In other words, adjust screw 22 and install to such an extent that can adjust the length of protruding to bimetallic plates 21 sides from release lever 23, combine threadably with the screw hole 23c1 of release lever 23.
Electromagnet 24 is electrically connected in described power circuit, is installed on and bimetallic plates 21 position adjacent, and the action work of going forward side by side that is magnetized when on the described power circuit abnormal current taking place quickens the bending of bimetallic plates 21.
The following describes the action of instantaneous trip mechanism 20 of the conventional art of formation like this.
The corresponding fixed contact 10b of moving contact 10a contact of switching mechanism 10, power circuit forms closed circuit state in the family, under "on" position, if flow through normal current on the power circuit, even then bimetallic plates 21 are to release lever 23 lateral bending songs, its degree also can be ignored, thereby bimetallic plates 21 keep from the state of adjustment screw 22 separation of the top 23c that is positioned at release lever 23.
So release lever 23 also keeps retraining the state of switching mechanism 10 by snap close restraint slot 23b1, therefore, the moving contact 10a of switching mechanism 10 keeps in touch the closed circuit position of corresponding fixed contact 10b, keeps "on" position by described power circuit.
On the other hand, if flow through fault current on the power circuit, so, bimetallic plates 21 are to release lever 23 lateral bending songs, and pressurization and promotion are positioned at the adjustment screw 22 of the top 23c of release lever 23.
So, by means of the rotation of release lever 23, be released by the switching mechanism 10 of snap close restraint slot 23b1 constraint originally, so switching mechanism 10 moves, moving contact 10a is urged to the open-circuit position of separating from the fixed contact 10b of correspondence, that is, and the dropout position.Therefore, described power circuit is cut off, and family's internal burden equipment and wiring that protection is connected in power circuit are not subjected to the accident current affects.
But, with regard to the instantaneous trip mechanism 20 of the miniature circuit breaker of the conventional art that constitutes as mentioned above, owing to bimetallic plates 21 are attracted to release lever 23 sides and the magnetic pull deficiency of the electromagnet 24 of the action of quickening to thread off, exist the instantaneous trip mechanism 20 that requires instantaneous operation to lack the problem of reliable in action.
The utility model content
The purpose of this utility model is to provide a kind of instantaneous trip mechanism of miniature circuit breaker, when on the circuit abnormal current taking place, can further quicken the rate of bending of bimetallic plates, improves the reliability of instantaneous trip action.
The utility model, embodies by means of the embodiment with following formation as preferred sample attitude for reaching above-mentioned purpose.The utility model provides following technology to constitute for solving aforesaid problem.
The instantaneous trip mechanism of miniature circuit breaker of the present utility model comprises: release lever, it can be that rotate at the center with a side, for moving to the dropout position, it can move to the off-position of the switching mechanism that discharges described miniature circuit breaker and the constrained of the described switching mechanism of constraint; Bimetallic plates, it is electrically connected in circuit, when on the circuit abnormal current taking place, to described release lever lateral bending song, so that make described release lever move to described off-position; First magnet, its conduction is connected in circuit, is installed on and described bimetallic plates position adjacent, is magnetized when on the circuit abnormal current taking place, and makes described bimetallic plates bending; And second magnet, it is incorporated into described release lever, when on the circuit abnormal current taking place, the bending of described bimetallic plates is quickened.
As preferably, described first magnet is electromagnet, and described second magnet is permanent magnet.
As preferably, described release lever has and is divided into two a pair of top, on a pair of top of described release lever, is separately installed with the adjustment screw that is used to adjust the distance between described bimetallic plates and described release lever; Described second magnet connects described a pair of top respectively, and each described second magnet possesses the through hole that is used for for described adjustment screw perforation.
Instantaneous trip mechanism according to miniature circuit breaker of the present utility model, on the electromagnet basis, comprise the permanent magnet that is installed on release lever, therefore, permanent magnet quickens the bimetallic rate of bending to release lever lateral bending song, thereby can obtain to shorten the effect of instantaneous trip time.
In addition, according to the utility model, release lever has and is divided into two a pair of top, a pair of top at described release lever, be separately installed with the adjustment screw that is used to adjust the distance between described bimetallic plates and described release lever, described permanent magnet is made of the pair of permanent magnets that is attached to described a pair of top respectively, and each described permanent magnet possesses the openings that allows described adjustment screw to connect, thereby can obtain the effect when adjusting screw to connect permanent magnet the position adjusted.
Description of drawings
Fig. 1 is in the miniature circuit breaker of conventional art, shows the end view of major part with the state of removing upper case.
Fig. 2 is the stereogram of the bimetallic plates in the displayed map 1.
Fig. 3 is the front view of the adjustment screw in the displayed map 1.
Fig. 4 is the front view of the release lever structure in the displayed map 1.
Fig. 5 is the stereogram of the electromagnet structure in the displayed map 1.
Fig. 6 is in the miniature circuit breaker of the utility model preferred embodiment, shows the end view of major part with the state of removing upper case.
Fig. 7 is the stereogram that shows the permanent magnet structure in the miniature circuit breaker shown in Figure 6.
Fig. 8 is the stereogram that shows the release lever in the miniature circuit breaker shown in Figure 6 and adjust the assembly of screw and permanent magnet.
Embodiment
By the following explanation that reference Fig. 6 to Fig. 8 carries out the utility model preferred embodiment, will more clearly understand described the purpose of this utility model and formation of the present utility model and the action effect thereof of reaching it.
Fig. 6 is in the miniature circuit breaker of the utility model preferred embodiment, the end view that shows major part with the state of removing upper case, Fig. 7 is the stereogram that shows the permanent magnet structure in the miniature circuit breaker shown in Figure 6, and Fig. 8 is the stereogram that shows the release lever in the miniature circuit breaker shown in Figure 6 and adjust the assembly of screw and permanent magnet.
As shown in Figure 6, the miniature circuit breaker 100 of the utility model embodiment comprises switching mechanism 10 and instantaneous trip mechanism 20.
Described switching mechanism 10 can comprise: fixed contact 10b, and it is electrically connected in the mains side of family's power circuit (house wiring), that is and, electric power inserts side; Moving contact 10a, the load-side that it is electrically connected in described power circuit, have contact fixed contact 10b and power circuit (house wiring) form "on" position closed circuit position (claim not only ON position), comprise from fixed contact 10b separate and power circuit (house wiring) from the position (but also claiming the OFF position) of mains side hand off or the open-circuit position of dropout (TRIP) position of automatic cut-out (dropout); And as moving contact 10a the driven for opening and closing extremely handle, lever (LEVER), connecting rod (LINK), dropout spring (TRIP SPRING), snap close (LATCH) etc. of the mechanism of described closed circuit position or open-circuit position.
The instantaneous trip mechanism 20 of miniature circuit breaker 100 can comprise release lever (TRIP BAR) 23, bimetallic plates (BI-METAL) 21, electromagnet 24 (first magnet) and permanent magnet 25 (second magnet).
Release lever 23 is can be the device that rotate at the center with the bottom, and for moving to dropout (TRIP) position, it can move to the off-position of the switching mechanism 10 that discharges described miniature circuit breaker 100 and the constrained of the described switching mechanism 10 of constraint.
As shown in Figure 8, release lever 23 has the axle accommodation section 23a that can hold the rotation axis (not shown) as the member of capitalization " Y " shape in the bottom, can be that rotate at the center with described rotation axis.
As shown in Figure 6, described release lever 23 is installed in the motion track of bimetallic plates 21 opposite to each other with bimetallic plates 21.
In addition, release lever 23 comprises the top 23c that is divided into two, is disposed at the main part 23b between top 23c and the described axle accommodation section 23a.
The main part 23b of release lever 23 has the snap close restraint slot 23b1 that the described snap close to switching mechanism 10 retrains or discharges.
At two the top 23c of being divided into of release lever 23, dispose respectively for adjust screw 22 threadably in conjunction with and screw hole (threaded opening) 23c1 that connects.
Bimetallic plates 21 are electrically connected in circuit, when on the circuit abnormal current taking place, to release lever 23 lateral bending songs, so that to release lever 23 pressurizations, make it move on to described off-position.
At a pair of top 23c of release lever 23, be separately installed with the adjustment screw 22 of the distance that is used to adjust 23 of bimetallic plates 21 and release levers.
Bimetallic plates 21 are to make a side of close the release lever 23 with different thermal coefficient of expansion and away from two board amalgamations of a side of release lever 23, particularly away from the thermal coefficient of expansion of the side plate portion of release lever 23 greater than side plate portion near release lever 23, when thermal expansion, to release lever 23 lateral bending songs.
Therefore, when bimetallic plates 21 flow through fault current on described power circuit, to release lever 23 lateral bending songs.When described bimetallic plates 21 were crooked, bimetallic plates 21 promoted release levers 23 by adjusting screw 22, make release lever 23 move to the off-position, so that make switching mechanism 10 move to described open-circuit position.That is, be benchmark with Fig. 6, by means of bimetallic plates 21, described release lever 23 rotates to clockwise direction.
Electromagnet 24 is electrically connected in circuit, be installed on a position of release lever 23 same side adjacent with bimetallic plates 21, when on the circuit abnormal current taking place, be magnetized, draw bimetallic plates 21, thereby the bending of bimetallic plates 21 is quickened to release lever 23 side draughts.
Permanent magnet 25 is made of a pair of, as Fig. 6 and shown in Figure 8, is connected in release lever 23, particularly is connected in the top 23c of release lever 23, when on the circuit abnormal current taking place, the crooked of bimetallic plates 21 is further quickened.
As shown in Figures 7 and 8, each permanent magnet 25 possesses the through hole 25a that is used for for adjusting screw 22 perforations.
With reference to Fig. 6, illustrate by the effect of the instantaneous trip mechanism 20 of the miniature circuit breaker of the utility model preferred embodiment of formation as mentioned above.
The corresponding fixed contact 10b of moving contact 10a contact of switching mechanism 10, power circuit forms closed circuit state in the family, under "on" position, if flow through normal current on the power circuit, even then bimetallic plates 21 are to release lever 23 lateral bending songs, its degree also can be ignored, thereby bimetallic plates 21 keep from the state of adjustment screw 22 separation of the top 23c that is positioned at release lever 23.
So release lever 23 also keeps retraining the state of switching mechanism 10 by snap close restraint slot 23b1, therefore, the moving contact 10a of switching mechanism 10 keeps in touch the closed circuit position of corresponding fixed contact 10b, keeps "on" position by described power circuit.
On the other hand, if flow through fault current on the power circuit, so, bimetallic plates 21 are to release lever 23 lateral bending songs, and pressurization and promotion are positioned at the adjustment screw 22 of the top 23c of release lever 23.At this moment, the magnetic pull acting in conjunction of permanent magnet 25 of the magnetic pull of electromagnet 24 and adjustment screw 22 sides that are installed on release lever 23 is in bimetallic plates 21, and bimetallic plates 21 quicken to the speed of release lever 23 lateral bending songs.
Therefore,, discharged rapidly by the switching mechanism 10 of snap close restraint slot 23b1 constraint originally,, moving contact 10a was urged to the open-circuit position of separating from the fixed contact 10b of correspondence so switching mechanism 10 moves by means of the rotation of release lever 23, that is, and the dropout position.Therefore, described power circuit is cut off, and family's internal burden equipment and wiring that protection is connected in power circuit are not subjected to the accident current affects.
As mentioned above, the instantaneous trip mechanism of miniature circuit breaker of the present utility model is on the electromagnet basis, comprise the permanent magnet that is installed on release lever, thereby permanent magnet quickens the bimetallic rate of bending to release lever lateral bending song, thereby can obtain to shorten the effect of instantaneous trip time.

Claims (3)

1. the instantaneous trip mechanism of a miniature circuit breaker has switching mechanism, it is characterized in that comprising:
Release lever, it can be that rotate at the center with a side, for moving to the dropout position, it can move to the off-position of the switching mechanism that discharges described miniature circuit breaker and the constrained of the described switching mechanism of constraint;
Bimetallic plates, it is electrically connected in circuit, when on the circuit abnormal current taking place, to described release lever lateral bending song, so that make described release lever move to described off-position;
First magnet, its conduction is connected in circuit, is installed on and described bimetallic plates position adjacent, is magnetized when on the circuit abnormal current taking place, and makes described bimetallic plates bending; And
Second magnet, it is incorporated into described release lever, when on the circuit abnormal current taking place, the bending of described bimetallic plates is quickened.
2. the instantaneous trip mechanism of miniature circuit breaker according to claim 1 is characterized in that:
Described first magnet is electromagnet, and described second magnet is permanent magnet.
3. the instantaneous trip mechanism of miniature circuit breaker according to claim 1 is characterized in that:
Described release lever has and is divided into two a pair of top, on a pair of top of described release lever, is separately installed with the adjustment screw that is used to adjust the distance between described bimetallic plates and described release lever;
Described second magnet connects described a pair of top respectively, and each described second magnet possesses the through hole that is used for for described adjustment screw perforation.
CN2012207111961U 2011-12-20 2012-12-20 Instantaneous tripping mechanism for miniature circuit breaker Expired - Fee Related CN203103243U (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
KR2020110011303U KR200477249Y1 (en) 2011-12-20 2011-12-20 Instant trip mechanism for small circuit breaker
KR20-2011-0011303 2011-12-20

Publications (1)

Publication Number Publication Date
CN203103243U true CN203103243U (en) 2013-07-31

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CN2012207111961U Expired - Fee Related CN203103243U (en) 2011-12-20 2012-12-20 Instantaneous tripping mechanism for miniature circuit breaker

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CN (1) CN203103243U (en)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB2591796A (en) * 2020-02-07 2021-08-11 Eaton Intelligent Power Ltd Circuit breaker and method for operating a circuit breaker

Family Cites Families (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
KR100487408B1 (en) * 2002-07-03 2005-05-03 엘에스산전 주식회사 trip portion structure of MCCB
KR100480008B1 (en) * 2003-04-21 2005-03-31 엘지산전 주식회사 Circuit braker
JP4972003B2 (en) * 2008-01-25 2012-07-11 パナソニック株式会社 Circuit breaker
KR101012046B1 (en) * 2008-12-22 2011-01-31 상도전기통신 주식회사 Instant Trip Device of Small Electrical Circuit Breaker

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KR200477249Y1 (en) 2015-05-22
KR20130003874U (en) 2013-06-28

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C14 Grant of patent or utility model
GR01 Patent grant
CF01 Termination of patent right due to non-payment of annual fee

Granted publication date: 20130731

Termination date: 20201220

CF01 Termination of patent right due to non-payment of annual fee