CN103247488B - Current-limiting device of miniature circuit breaker - Google Patents
Current-limiting device of miniature circuit breaker Download PDFInfo
- Publication number
- CN103247488B CN103247488B CN201310176430.4A CN201310176430A CN103247488B CN 103247488 B CN103247488 B CN 103247488B CN 201310176430 A CN201310176430 A CN 201310176430A CN 103247488 B CN103247488 B CN 103247488B
- Authority
- CN
- China
- Prior art keywords
- feeler lever
- housing
- current
- inwall
- circuit breaker
- 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
Links
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- Breakers (AREA)
Abstract
The invention belongs to the technical field of low-voltage apparatuses, and particularly relates to a current-limiting circuit breaker. The technical scheme is that the current-limiting device comprises a housing (1), an end cover (2), a spring (3), a movable feeler lever (4), a fixed feeler lever (5), arc extinction grid sheets (6) and a de-ionization net (7), wherein the movable feeler lever (4) and the fixed feeler lever (5) are mounted inside the housing (1); the spring (3) is mounted between the housing (1) and the movable feeler lever (4); the arc extinction grid sheets (6) are mounted in grid sheet partition plates arranged on two sides at the front end of the inner wall of the housing (1); and the front end of the housing (1) is sealed by the end cover (2). The circuit of the current-limiting device can be turned on for a long time under normal conditions, when larger short-circuit current occurs in the circuit, the circuit is turned on by a movable contact before the main contact in a molded case circuit breaker; the current-limiting device and the main contact in the molded case circuit breaker commonly break the short-circuit current, so that the purposes of limiting the short-circuit current, increasing the speed of breaking the short-circuit current, and improving the short-circuit breaking capability are achieved.
Description
Technical field
The invention belongs to low voltage electrical apparatus technology field, be specifically related to a kind of current limiting circuit breaker of miniature circuit breaker.
Background technology
Traditional small-size moulded case circuit breaker adopts one group of contact to carry out deciliter and breaking current, and when there is larger short circuit current, contact breaking arc is more difficult, is difficult to realize high breaking.Special for rated current at 16A and following circuit breaker, when running into large short circuit current, easily occur that circuit breaker coil or heater element blown damages problem;
For naval vessel small-size moulded case circuit breaker, especially for the circuit breaker of some special occasions, require higher short circuit breaking capacity and less overall volume, require the faulty circuit that disjunction is larger in 8 ~ 10ms, general miniature circuit breaker cannot meet these requirements.
Summary of the invention
The object of the invention is: on the basis of traditional small-size moulded case circuit breaker, increase a current-limiting apparatus, this Plant arrangement, in the inside of circuit breaker, is connected in circuit breaker major loop; Make current-limiting apparatus under normal circumstances can connect circuit for a long time, and when there is larger short circuit current in main circuit, the moving contact of this device and fixed contact produce electrodynamic repulsion force under the effect of big current, moving contact can prior to main contact breaking current; Thus reach the object improving circuit breaker breaking capacity;
Technical scheme of the present invention is: a kind of current-limiting apparatus of miniature circuit breaker, and it is serially connected in circuit breaker main circuit, and it comprises: housing, end cap, spring, movable feeler lever, stationary contact bar, arc extinguishing grid pieces and remove free net;
The top of housing is provided with wire lead-out groove; The bottom of housing is provided with the extraction interface of stationary contact bar; Wire lead-out groove is corresponding up and down with the extraction interface of stationary contact bar, what in the inner walls below wire lead-out groove, level was corresponding is provided with annular boss, housing on rear side of wire lead-out groove and stationary contact bar is provided with threaded mounting hole, inner walls top is provided with spring fitting groove, both sides, inner walls front end are provided with grid slot, and in the middle part of inner walls, both sides, below are provided with square mounting hole;
The inwall of end cap is provided with the grid slot corresponding with inner walls front end, is provided with swims off-grid mounting groove in the below of grid slot;
In the mounting groove going free net to be arranged on below end cap;
Movable feeler lever is broken line type, its head level, and middle part upwards bends, afterbody keep level and horizontal outwardly; The lower surface of movable feeler lever head is provided with contact, and upper surface is provided with spring base, movable feeler lever afterbody upper surface access wire;
Stationary contact bar is made up of feeler lever A and feeler lever B, and wherein, feeler lever A is z font, and head upper surface is provided with contact, and head both sides respectively front and back are provided with two square projections, and feeler lever B is inverted L-type, and vertical end is provided with looping pit, accesses wire in looping pit; The afterbody lower surface of feeler lever A contacts with the upper surface of feeler lever B horizontal ends;
The side of the square region between former and later two square projections of the head of feeler lever A parallels with the side of homonymy movable feeler lever;
Overall package is closed: movable feeler lever is arranged on the annular boss of inner walls by its afterbody ledge, the wire of movable feeler lever afterbody access is drawn from wire lead-out groove, feeler lever A is arranged on the square mounting hole of inner walls by the square projection of its head, the vertical end of feeler lever B is drawn from the extraction interface of stationary contact bar, spring one end snaps in the spring base of movable feeler lever upper surface, the other end is arranged on the spring fitting groove of inner walls, arc extinguishing grid pieces is arranged on both sides, inner walls front end and is provided with in grid slot, and end cap is by the forward end seal of housing.
When there is larger short circuit current in main circuit, movable feeler lever and stationary contact bar produce electrodynamic repulsion force under the effect of big current, and movable feeler lever can prior to main contact breaking current.Due to opening rapidly of movable feeler lever, between moving contact and fixed contact, produce electric arc, be equivalent in major loop, sealed in arc resistance, thus limit the increase of circuit short circuit currents, reduce the difficulty of circuit breaker disjunction short circuit current; While movable feeler lever is scolded out by electrodynamic repulsion force, the release of circuit breaker is threaded off because of short circuit, and main contact is opened thereupon, disconnect while two groups of contacts, common disjunction short circuit current, makes the rapid disjunction of the short circuit current of major loop, thus reaches the object improving circuit breaker breaking capacity; When short circuit current drop to enough little or short circuit current broken after, the movable feeler lever of current-limiting apparatus under spring force, contacts with stationary contact bar, and continue the effect bearing On current, major loop remains open state by main contact;
The invention has the beneficial effects as follows: circuit breaker rated current being less than to 16A, because the wire of coil is comparatively thin, the resistance of heater element is comparatively large, and larger short circuit current flows through coil and the heater element of circuit breaker, often coil or heater element is blown; For same circuit breaker, after sealing in the present invention, due to the metering function of current-limiting apparatus, the electric current in major loop is made to be significantly less than situation not with current-limiting apparatus, therefore can reduce the possibility that coil and heater element are blown, improve the ability of disjunction short circuit current.
Accompanying drawing explanation
Fig. 1 is structural representation of the present invention;
Fig. 2 is structural blast figure of the present invention in embodiment;
Wherein, 1-housing, 2-end cap, 3-spring, 4-movable feeler lever, 5-stationary contact bar, 6-arc extinguishing grid pieces, 7-remove free net.
Embodiment
See accompanying drawing 1, a kind of current-limiting apparatus of miniature circuit breaker, it is serially connected in circuit breaker main circuit, and it comprises: housing 1, end cap 2, spring 3, movable feeler lever 4, stationary contact bar 5, arc extinguishing grid pieces 6 and remove free net 7;
The top of housing 1 is provided with wire lead-out groove; The bottom of housing 1 is provided with the extraction interface of stationary contact bar 5; Wire lead-out groove is corresponding up and down with the extraction interface of stationary contact bar 5, what on housing 1 inwall below wire lead-out groove, level was corresponding is provided with annular boss, housing 1 on rear side of wire lead-out groove and stationary contact bar 5 is provided with threaded mounting hole, housing 1 inwall top is provided with spring fitting groove, both sides, housing 1 inwall front end are provided with grid slot, and in the middle part of housing 1 inwall, both sides, below are provided with square mounting hole;
The inwall of end cap 2 is provided with the grid slot corresponding with housing 1 inwall front end, is provided with the mounting groove of free net 7 in the below of grid slot;
Free net 7 is gone to be arranged in the mounting groove below end cap 2;
Movable feeler lever 4 is broken line type, its head level, and middle part upwards bends, afterbody keep level and horizontal outwardly; The lower surface of movable feeler lever 4 head is provided with contact, and upper surface is provided with spring base, movable feeler lever 4 afterbody upper surface access wire;
Stationary contact bar 5 is made up of feeler lever A and feeler lever B, and wherein, feeler lever A is z font, and head upper surface is provided with contact, and head both sides respectively front and back are provided with two square projections, and feeler lever B is inverted L-type, and vertical end is provided with looping pit, accesses wire in looping pit; The afterbody lower surface of feeler lever A contacts with the upper surface of feeler lever B horizontal ends;
The side of the square region between former and later two square projections of the head of feeler lever A parallels with the side of homonymy movable feeler lever 4;
Overall package is closed: movable feeler lever 4 is arranged on the annular boss of housing 1 inwall by its afterbody ledge, the wire of movable feeler lever 4 afterbody access is drawn from wire lead-out groove, feeler lever A is arranged on the square mounting hole of housing 1 inwall by the square projection of its head, the vertical end of feeler lever B is drawn from the extraction interface of stationary contact bar 5, spring 3 one end snaps in the spring base of movable feeler lever 4 upper surface, the other end is arranged on the spring fitting groove of housing 1 inwall, arc extinguishing grid pieces 6 is arranged on both sides, housing 1 inwall front end and is provided with in grid slot, and end cap 2 is by the forward end seal of housing 1;
In the process of contact disjunction short circuit current, the electric arc that contact disjunction produces is limited in housing 1 combustion and extinguishing, can not have an impact to other parts of circuit breaker; Stationary contact bar 5 is fixed on current-limiting apparatus housing 1, and one end is drawn from housing 1 bottom and connected with circuit breaker galvanic circle; Movable feeler lever can rotate up and down, is pressed on the contact of stationary contact bar 5 by spring 3 by the contact on movable feeler lever 4, normal condition lower moving contact and fixed contact reliable contacts, connects operating current; Movable feeler lever 4 and stationary contact bar 5 near but do not contact, the sense of current flow through in movable feeler lever 4 and stationary contact bar 5 is contrary; When short circuit current is enough large, this electric current produces electrodynamic repulsion force between movable feeler lever 4 and stationary contact bar 5; When this repulsion is greater than the pressure of spring 3 pairs of movable feeler levers 4, movable feeler lever 4 is scolded out instantaneous; Cause short circuit current to drop to electrodynamic repulsion force when being less than the pressure of spring 3 pairs of movable feeler levers 4 when instantaneous the scolding out of movable feeler lever 4, the contact of movable feeler lever 4 and the contact of stationary contact bar 5 keep in touch again, and current-limiting apparatus keeps again conducting state;
Movable feeler lever 4 by instantaneous scold out time, produce electric arc between the contact of movable feeler lever 4 and the contact of stationary contact bar 5, this electric arc attract by arc extinguishing grid pieces 6 and enter in arc control device, electric arc is cut by arc extinguishing grid pieces 6 and cools, disjunction short circuit current common with main contact; When electric arc is extruded arc control device by air-flow within the case 1, when spraying from the puff prot of housing 1, gone to dissociate by charged ion through the past net 7 that dissociates, what finally spray is not charged gas, can reduce the flashover distance of circuit breaker;
The contact of movable feeler lever 4 and the contact of stationary contact bar 5 should have good resistance fusion welding, with prevent contact scold out with the process contacted in there is melting welding.Silver alloy contact generally can be adopted to match use, as: silver tungsten contact, silver-colored graphite contact, silver-colored tungsten carbide contact etc.;
Movable feeler lever 4 and stationary contact bar 5 near but discontiguous requirement should meet: when circuit breaker is below 15 times of rated current, contact can reliably be connected, and must not occur contact bounce or shake; When circuit breaker is more than 25 times of rated current, movable feeler lever 4 can be scolded out rapidly.Control electrodynamic repulsion force can adopt the distance between reduction two conductor, by the distance controlling between two conductors at 1.5mm to 5mm; Also by adjusting the parameter of spring 3 and increasing the measures such as projected area between two conductors;
Figure 2 shows structural blast figure of the present invention, when actual design, for easy to assembly, housing 1 is designed to two the combinable structures in left and right;
For effectively improving the arc quenching effect of arc control device, arc extinguishing grid pieces 6 generally can adopt the cold-rolled steel sheet of ferromagnetic material to make, and the thickness of grid is 0.5mm to 1.5mm, and the quantity of arc extinguishing grid pieces 6 should be many as far as possible, should ensure certain distance between grid, general distance is 0.5mm to 1.5mm.
Claims (3)
1. the current-limiting apparatus of a miniature circuit breaker, it is serially connected in circuit breaker main circuit, it is characterized in that, it comprises: housing (1), end cap (2), spring (3), movable feeler lever (4), stationary contact bar (5), arc extinguishing grid pieces (6) and remove free net (7);
The top of described housing (1) is provided with wire lead-out groove; The bottom of described housing (1) is provided with the extraction interface of described stationary contact bar (5); Described wire lead-out groove is corresponding up and down with the extraction interface of described stationary contact bar (5), what on described housing (1) inwall below described wire lead-out groove, level was corresponding is provided with annular boss, described housing (1) on rear side of described wire lead-out groove and described stationary contact bar (5) is provided with threaded mounting hole, described housing (1) inwall top is provided with spring fitting groove, both sides, described housing (1) inwall front end are provided with grid slot, and in the middle part of described housing (1) inwall, both sides, below are provided with square mounting hole;
The inwall of described end cap (2) is provided with the grid slot corresponding with described housing (1) inwall front end, removes the mounting groove of free net (7) described in the below of the grid slot on end cap inwall is provided with;
In the described mounting groove going free net (7) to be arranged on described end cap (2) below;
Described movable feeler lever (4) is broken line type, its head level, and middle part upwards bends, afterbody keep level and horizontal outwardly; The lower surface of described movable feeler lever (4) head is provided with contact, and upper surface is provided with spring base, described movable feeler lever (4) afterbody upper surface access wire;
Described stationary contact bar (5) is made up of feeler lever A and feeler lever B, and wherein, feeler lever A is z font, head upper surface is provided with contact, and head both sides respectively front and back are provided with two square projections, and feeler lever B is inverted L-type, vertical end is provided with looping pit, accesses wire in described looping pit; The afterbody lower surface of described feeler lever A contacts with the upper surface of described feeler lever B horizontal ends;
The side of the square region between former and later two square projections of the head of described feeler lever A parallels with the side of movable feeler lever described in homonymy (4);
Overall package is closed: described movable feeler lever (4) is arranged in the annular boss of described housing (1) inwall by its afterbody ledge, the wire of described movable feeler lever (4) afterbody access is drawn from described wire lead-out groove, described feeler lever A is arranged on the square mounting hole of described housing (1) inwall by the square projection of its head, the vertical end of described feeler lever B is drawn from the extraction interface of described stationary contact bar (5), described spring (3) one end snaps in the spring base of described movable feeler lever (4) upper surface, the other end is arranged on the spring fitting groove of described housing (1) inwall, described arc extinguishing grid pieces (6) is arranged in the grid slot that both sides, described housing (1) inwall front end are provided with, described end cap (2) is by the forward end seal of described housing (1).
2. the current-limiting apparatus of a kind of miniature circuit breaker as claimed in claim 1, is characterized in that, described movable feeler lever (4) adopts silver alloy to match with the contact of stationary contact bar (5) and uses.
3. the current-limiting apparatus of a kind of miniature circuit breaker as claimed in claim 1 or 2, is characterized in that, described arc extinguishing grid pieces (6) adopts the cold-rolled steel sheet of ferromagnetic material to make, and thickness is 0.5mm to 1.5mm, and distance is each other 0.5mm to 1.5mm.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310176430.4A CN103247488B (en) | 2013-05-14 | 2013-05-14 | Current-limiting device of miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310176430.4A CN103247488B (en) | 2013-05-14 | 2013-05-14 | Current-limiting device of miniature circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN103247488A CN103247488A (en) | 2013-08-14 |
| CN103247488B true CN103247488B (en) | 2015-04-15 |
Family
ID=48926929
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310176430.4A Active CN103247488B (en) | 2013-05-14 | 2013-05-14 | Current-limiting device of miniature circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN103247488B (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103730278A (en) * | 2013-12-20 | 2014-04-16 | 吴江市东泰电力特种开关有限公司 | Power switch |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4195212A (en) * | 1977-06-06 | 1980-03-25 | Eaton Corporation | Contactor having higher fault current withstandability |
| CN101030506A (en) * | 2007-01-01 | 2007-09-05 | 常熟开关制造有限公司(原常熟开关厂） | Contact system of breaker |
| CN201576638U (en) * | 2009-11-12 | 2010-09-08 | 徐浩明 | Small circuit breaker current limiting device |
| CN102623255A (en) * | 2011-01-27 | 2012-08-01 | 富士电机机器制御株式会社 | Circuit breaker |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100492760B1 (en) * | 2003-05-27 | 2005-06-07 | 엘에스산전 주식회사 | Current-limiting circuit breaker |
-
2013
- 2013-05-14 CN CN201310176430.4A patent/CN103247488B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4195212A (en) * | 1977-06-06 | 1980-03-25 | Eaton Corporation | Contactor having higher fault current withstandability |
| CN101030506A (en) * | 2007-01-01 | 2007-09-05 | 常熟开关制造有限公司(原常熟开关厂） | Contact system of breaker |
| CN201576638U (en) * | 2009-11-12 | 2010-09-08 | 徐浩明 | Small circuit breaker current limiting device |
| CN102623255A (en) * | 2011-01-27 | 2012-08-01 | 富士电机机器制御株式会社 | Circuit breaker |
Also Published As
| Publication number | Publication date |
|---|---|
| CN103247488A (en) | 2013-08-14 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN202736866U (en) | Molded case circuit breaker | |
| CN102486982A (en) | Breaker with forced flash barrier device | |
| CN102881493A (en) | Electromagnetic vortex repulsion quick arc extinguishing switch | |
| CN104704591A (en) | Switch device | |
| CN202839374U (en) | Quick arc-extinguishing switch | |
| CN204215989U (en) | A kind of circuit breaker being beneficial to electric arc fast moving and elongation | |
| CN109494132B (en) | Double-contact molded case circuit breaker | |
| CN103247488B (en) | Current-limiting device of miniature circuit breaker | |
| CN204857638U (en) | Prepayment circuit breaker arc initiation device | |
| CN103000465B (en) | Contact system of novel high-capacity medium-voltage direct current breaker | |
| CN107622908B (en) | Movable double-loop contact structure and vacuum arc-extinguishing chamber | |
| CN212570905U (en) | Electromagnetic system of plastic case type circuit breaker | |
| CN201886996U (en) | Circuit breaker with compulsory arc partitioning device | |
| CN201069749Y (en) | DC breaker | |
| CN209658121U (en) | Air-sweeping type low-voltage arc eliminating device and breaker | |
| CN213424905U (en) | Plastic casing type circuit breaker | |
| CN202651039U (en) | Miniature breaker | |
| CN207303020U (en) | A kind of high breaking moulded case circuit breaker arc-control device | |
| CN207338255U (en) | Galvanic circle with electric power compensation function | |
| CN207303021U (en) | A kind of breaker of plastic casing with powerful disjunction short circuit current flow ability | |
| CN207303017U (en) | A kind of AC and DC omnipotent breaker with stronger arc quenching effect | |
| CN201788917U (en) | Contact device for N pole incapable of extinguishing arc | |
| CN202259104U (en) | Stationary contact of circuit breaker | |
| CN108666185B (en) | Large-current miniature circuit breaker | |
| CN209591955U (en) | A kind of striking static contact and its breaker of plastic casing |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C53 | Correction of patent for invention or patent application | ||
| CB03 | Change of inventor or designer information |
Inventor after: Gong Ruiliang Inventor after: Yang Dongsheng Inventor after: Qin Ganghua Inventor after: Bi Sheng Inventor after: Bo Yu Inventor before: Gong Ruiliang Inventor before: Yang Dongsheng Inventor before: Qin Ganghua Inventor before: Bi Sheng Inventor before: Bo Yu |
|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |