CN102024634B - Miniature circuit breaker - Google Patents
Miniature circuit breaker Download PDFInfo
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- CN102024634B CN102024634B CN 201010576042 CN201010576042A CN102024634B CN 102024634 B CN102024634 B CN 102024634B CN 201010576042 CN201010576042 CN 201010576042 CN 201010576042 A CN201010576042 A CN 201010576042A CN 102024634 B CN102024634 B CN 102024634B
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- moving contact
- binding post
- circuit breaker
- arc
- miniature circuit
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Abstract
The invention discloses a miniature circuit breaker, which belongs to the technical field of low-voltage apparatus. The miniature circuit breaker comprises a moving contact which is mounted in a shell and electrically connected with a first wiring terminal, a static contact which is also mounted in the shell and electrically connected with a second wiring terminal, an arc chute piece which is located in the shell and used for extinguishing the electric arc generated when the moving and static contacts are separated, a moving contact arc striking plate which is corresponding to the moving contact and one end of which is extended to the arc chute piece and the other end is electrically connected with the first wiring terminal, and an electromagnetic coil and thermal element which are distributed on the same side of the moving contact, wherein the electromagnetic coil and the thermal element are connected in series and then connected in series between the moving contact and the first wiring terminal. The invention has the advantages that: the breaking capacity and the electric service life of the miniature circuit breaker are remarkably improved.
Description
Technical field
The invention belongs to the low voltage electrical apparatus technology field, be specifically related to a kind of miniature circuit breaker.
Background technology
Miniature circuit breaker is disposed in the low voltage electric network, plays the effect of the fault current in restriction or the open circuit.When occurring such as the large electric current that caused by short circuit in the circuit, the moving contact of configuration relative to fixed contact moves to opening direction under the effect of electrodynamic repulsion force, can produce electric arc when dynamic and static contact separates, electric arc enters arc control device and extinguishes under the driving in self-excitation magnetic field, make the short circuit current disjunction.For the ascensional range of limiting short-circuit current and improve breaking capacity, series limiting resistor is a kind of more common method in the major loop of miniature circuit breaker, but, owing to directly current-limiting resistance is connected in the major loop of miniature circuit breaker, therefore can under the miniature circuit breaker "on" position, increase extra temperature rise and power loss, therefore there is the problem of attending to one thing and lose sight of another.
General preferred solution is that current-limiting resistance is connected in the moving contact run-on tab loop, perhaps the moving contact run-on tab is made of high-resistance material or ptc material.Figure 2 shows that the schematic diagram of the miniature circuit breaker in the prior art, comprise and be installed in the housing and moving contact 2 that be electrically connected with the first binding post 6, be installed in equally in the housing and fixed contact 1 that be electrically connected with the second binding post 4, be positioned at the moving for extinguishing of housing, fixed contact 2, the arc extinguishing grid pieces 7 of 1 electric arc 10 that produces when scolding out, corresponding with moving contact 2 an and end extends to arc extinguishing grid pieces 7 and moving contact run-on tab 3 that the other end is electrically connected with the first binding post 6, be serially connected in current-limiting resistance 5 between moving contact run-on tab 3 and the first binding post 6 (perhaps remove the first current-limiting resistance 5 and moving contact run-on tab 3 is made of high-resistance material or PTC (semistor) material, self consist of current-limiting resistance by moving contact run-on tab 3), be serially connected in the thermal element 8 between moving contact 2 and the first binding post 6 and be serially connected in fixed contact 1 and the second binding post 4 between solenoid 9.
This kind structure is owing to being series at current-limiting resistance 5 in the loop of moving contact run-on tab 3, then under the closing of power circuit breaker situation, electric current not-go end leakage resistance 5, thus current-limiting resistance 5 heating and extra power consumption can be avoided; Yet when short circuit current occured, moving contact 2 was scolded out with respect to fixed contact 1, produce electric arc 10 between the dynamic and static contact 2,1, electric arc 10 jumps on (transferring to) moving contact run-on tab 3 under the effect of magnetic blow-out and/or air-blowing power, is played the effect of limiting short-circuit current by current-limiting resistance 5.As seen, current-limiting resistance 5 is series at technical measures in the loop of moving contact run-on tab 3 and can avoids drawback in the aforesaid major loop that current-limiting resistance directly is series at circuit breaker.
Obviously, purpose from limiting short-circuit current, the resistance that is series at the current-limiting resistance in the loop of moving contact run-on tab is higher, the current limitation effect that produces is better, but, owing to the extensive reason of approval of industry: namely the electric arc arc root complexity that jumps to another path from a path depends on the resistance ratio of two paths, and it is relatively easy that electric arc shifts to the less passage of resistance from the larger passage of resistance, on the contrary difficult then.
Prior art is in the structure shown in Figure 2, solenoid 9 is electrically connected with fixed contact 1, thermal element 8 is electrically connected with moving contact 2, be the both sides that solenoid 9 and thermal element 8 place respectively arc control device, so in cut-offfing the process of short circuit current, if do not consider arc resistance, the loop resistance before the arc transfer is the resistance sum of resistance and the thermal element 8 of solenoid 9 so, and the loop resistance after the arc transfer is the resistance sum of resistance and the current-limiting resistance 5 of solenoid 9.Fairly obvious, solenoid 9 all shows as before and after electric arc 10 shifts and is in the circuit, thereby can not utilize the resistance of solenoid 9 before and after electric arc 10 shifts, to obtain corresponding loop resistance difference, in the situation that guarantee smoothly redirect of electric arc 10, limit current-limiting resistance 5 sizes, finally affected the breaking capacity of miniature circuit breaker.This shows, structure shown in Figure 2 still has in addition improved necessity.
The applicant retrieves, yet does not all provide the technology enlightenment of the current limiting capacity that is able to promote effectively and significantly the miniature circuit breaker current-limiting resistance at published patent documentation such as CN1610039A (arc-control device of circuit breaker), CN1209777C (arc-control device of circuit breaker) and CN1988097A (arc-control device of breaker of plastic casing) etc.For this reason, the applicant has carried out good try, and technical scheme described below produces under this background.
Summary of the invention
Task of the present invention is to provide a kind of current limiting capacity that helps significantly to strengthen, and is conducive to make the electric arc arc root on the moving contact to transfer to moving contact run-on tab branch road and use the miniature circuit breaker that improves breaking capacity and electric life from starting the arc branch road rapidly.
Task of the present invention is finished like this, a kind of miniature circuit breaker, comprise and be installed in the housing and the moving contact that is electrically connected with the first binding post, be installed in equally in the housing and fixed contact that be electrically connected with the second binding post, be positioned at the moving for extinguishing of housing, the arc extinguishing grid pieces of the electric arc that produces when fixed contact is scolded out, corresponding with a moving contact and end extends to arc extinguishing grid pieces and moving contact run-on tab that the other end is electrically connected with the first binding post, be distributed in solenoid and thermal element with moving contact the same side, described solenoid be serially connected with simultaneously between moving contact and the first binding post after thermal element is connected in series.
In a specific embodiment of the present invention, described moving contact run-on tab is by high-resistance material or posistor material.
In another specific embodiment of the present invention, be in series with a current-limiting resistance between described moving contact run-on tab and described the first binding post.
Technical scheme provided by the invention is owing to being positioned at solenoid and thermal element in simultaneously moving contact the same side, described solenoid be serially connected with simultaneously between moving contact and the first binding post after thermal element is connected in series, thereby can eliminate the drawback in the prior art, make current limiting capacity be able to remarkable enhancing, electric arc arc root on the moving contact can be transferred to the branch road with moving contact striking power plate from starting the arc branch road rapidly, thereby the breaking capacity of miniature circuit breaker provided by the invention and electric life are significantly improved.
Description of drawings,
Fig. 1 is a specific embodiment schematic diagram of the present invention.
Fig. 2 is the schematic diagram of the miniature circuit breaker in the prior art.
Embodiment
For the auditor that the makes Patent Office especially public can be expressly understood technical spirit of the present invention and beneficial effect more, the applicant general elaborates in the mode of embodiment below, but all be not restriction to the present invention program to the description of embodiment, any according to the present invention's design done only for pro forma but not substantial equivalent transformation all should be considered as technical scheme category of the present invention.
See also Fig. 1, as a kind of miniature circuit breaker of the present invention, comprising: be installed in the housing and the moving contact 2 that is electrically connected with the first binding post 6; Be installed in equally in the housing and fixed contact 1 that be electrically connected with the second binding post 4; Be positioned at the arc extinguishing grid pieces 7 that is used for extinguishing the electric arc 10 that produces when dynamic and static contact 2,1 is scolded out of housing; Be positioned at moving contact 2 sides namely corresponding with moving contact 2 an and end extend to arc extinguishing grid pieces 7 and moving contact run-on tab 3 that the other end is electrically connected with the first binding post 6; Be connected in series in the current-limiting resistance 5 between moving contact run-on tab 3 and the first binding post 6; Be distributed in solenoid 9 and thermal element 8 with moving contact 2 the same sides, described solenoid 9 be serially connected with simultaneously between moving contact 2 and the first binding post 6 after thermal element 8 is connected in series.Technical essential as the present invention program: aforesaid solenoid 9 and thermal element 8 are serially connected between aforesaid moving contact 2 and the first binding post 6, more precisely, be connected in series successively thermal element 8 and solenoid 9 between moving contact 2 and the first binding post 6 or between moving contact 2 and the first binding post 6, be connected in series successively solenoid 9 and thermal element 8.Yet, prior art is connected in series in solenoid 9 between fixed contact 1 and the second binding post 4 because following inveterately traditional design philosophy, therefore, applicant's technical scheme has overcome the technology prejudice in the prior art, has embodied the outstanding substantive distinguishing features described in the superincumbent advantageous effect of the applicant hurdle and significant progressive.
Aforesaid moving contact run-on tab 3 both can use high-resistance material such as corrosion resistant plate, also can use posistor material (being ptc material), when moving contact run-on tab 3 adopts this material, can abandon so aforesaid current-limiting resistance 5.
Although applicant's housing that signal is not repeatedly mentioned in Fig. 1, because belong to known technology, for example referring to Figure of description and the corresponding content of CN16100939A, Given this reason can be owing to not signal and the understanding of technical scheme of the present invention is caused puzzlement to those of skill in the art in Fig. 1 of housing.
When miniature circuit breaker passed through normal current, electric current was through the second binding post 4, fixed contact 1, moving contact 2, thermal element 8, solenoid 9 and the first binding post 6; When large electric current appears in circuit, moving contact 2 is scolded out under the electrodynamic repulsion force effect, electric arc 10 appears between the dynamic and static contact 2,1, on fixed contact 1 and moving contact 2, at this moment, electric current is through the second binding post 4, fixed contact 1, moving contact 2, thermal element 8, solenoid 9 and the first binding post 6 respectively for electric arc arc root, electric arc 10 is under the effect of magnetic blow-out and/or air-blowing power, along the diagram direction of arrow, to the motion of arc-extinguishing chamber of circuit breaker arc extinguishing grid pieces 7 directions, electric arc arc root moves on the moving contact run-on tab 3.And on the moving contact 2 the arc root need skip and moving contact run-on tab 3 between the gap, jump on the moving contact run-on tab 3.Form electric current the first path by the second binding post 4, fixed contact 1, moving contact 2, thermal element 8, solenoid 9 and the first binding post 9 before the redirect, the second binding post 4, fixed contact 1, moving contact run-on tab 3 and the first binding post 6 form the electric current alternate path after the redirect.In the electric arc jump procedure, be accompanied by the formation of alternate path, the first path fades away, because the redirect of electric arc is easier to from the high resistance path to low resistance path redirect ratio realize, therefore the present invention accesses the first path simultaneously with solenoid 9 and thermal element 8, form alternate path, compared with prior art, increased the ratio of the first via resistance and alternate path resistance, in the situation that do not affect the electric arc redirect, the current-limiting resistance 5 on the moving contact run-on tab 3 be can increase, thereby breaking capacity and the electric life of miniature circuit breaker improved.
Claims (2)
1. miniature circuit breaker, comprise and be installed in the housing and the moving contact (2) that is electrically connected with the first binding post (6), be installed in equally in the housing and fixed contact (1) that be electrically connected with the second binding post (4), be positioned at the moving for extinguishing of housing, fixed contact (2, the arc extinguishing grid pieces (7) of the electric arc that produces when 1) scolding out (10), corresponding with moving contact (a 2) and end extends to arc extinguishing grid pieces (7) and moving contact run-on tab (3) that the other end is electrically connected with the first binding post (6), be distributed in solenoid (9) and thermal element (8) with moving contact (2) the same side, be characterised in that: described moving contact run-on tab (3) directly is connected with described the first binding post (6) or is connected with the first binding post (6) by series connection one current-limiting resistance (5), described solenoid (9) be serially connected with simultaneously between moving contact (2) and the first binding post (6) after thermal element (8) is connected in series.
2. miniature circuit breaker according to claim 1 is characterized in that described moving contact run-on tab (3) is by high-resistance material or posistor material.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010576042 CN102024634B (en) | 2010-12-03 | 2010-12-03 | Miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010576042 CN102024634B (en) | 2010-12-03 | 2010-12-03 | Miniature circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN102024634A CN102024634A (en) | 2011-04-20 |
| CN102024634B true CN102024634B (en) | 2013-04-10 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 201010576042 Active CN102024634B (en) | 2010-12-03 | 2010-12-03 | Miniature circuit breaker |
Country Status (1)
| Country | Link |
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| CN (1) | CN102024634B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106531585B (en) * | 2016-11-30 | 2018-02-06 | 林权豪 | A kind of swinging arc-extinguishing mechanism of power circuit breaker |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2308162Y (en) * | 1995-12-04 | 1999-02-17 | 机械工业部上海电器科学研究所 | Combined modular switch electrical equipment with control and protection functions |
| CN2409606Y (en) * | 2000-02-28 | 2000-12-06 | 常熟开关厂 | Small circuit breaker arc striking apparatus |
| DE102008017472A1 (en) * | 2007-04-28 | 2008-11-06 | Abb Ag | Service switching device |
| CN201387860Y (en) * | 2009-04-14 | 2010-01-20 | 上海良信电器股份有限公司 | Direct current (DC) circuit breaker promoting arc blowout in virtue of magnets |
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2010
- 2010-12-03 CN CN 201010576042 patent/CN102024634B/en active Active
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| Publication number | Publication date |
|---|---|
| CN102024634A (en) | 2011-04-20 |
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