CN1224070C - Current-limiting device with repulsive force mechanism - Google Patents
Current-limiting device with repulsive force mechanism Download PDFInfo
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- CN1224070C CN1224070C CN 01143014 CN01143014A CN1224070C CN 1224070 C CN1224070 C CN 1224070C CN 01143014 CN01143014 CN 01143014 CN 01143014 A CN01143014 A CN 01143014A CN 1224070 C CN1224070 C CN 1224070C
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- repulsion
- moving contact
- contact
- repulsive force
- pin
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- 230000005405 multipole Effects 0.000 description 4
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- 238000005516 engineering process Methods 0.000 description 2
- 238000007667 floating Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000000034 method Methods 0.000 description 2
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- 238000009825 accumulation Methods 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 239000004020 conductor Substances 0.000 description 1
- 230000006735 deficit Effects 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000008676 import Effects 0.000 description 1
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- 230000037431 insertion Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- NJPPVKZQTLUDBO-UHFFFAOYSA-N novaluron Chemical compound C1=C(Cl)C(OC(F)(F)C(OC(F)(F)F)F)=CC=C1NC(=O)NC(=O)C1=C(F)C=CC=C1F NJPPVKZQTLUDBO-UHFFFAOYSA-N 0.000 description 1
- 230000008569 process Effects 0.000 description 1
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Abstract
The present invention relates to a current limiting device with a repulsive force mechanism and is used on a breaker. A moving contact is provided with a repulsive force pin, and a repulsive force member is arranged outside the repulsive force pin. The end of the repulsive force member, which is away from the moving contact, is arranged on a support frame by a shaft pin, and the end which is close to the moving contact is arranged on the support frame by a reset spring. The repulsive force member forms a U shape to be bridged at both sides of the moving contact. The end which is away from the moving contact is bent inwards into a buckling body and is arranged on the support frame by the shaft pin. The inner side of the buckling body is provided with the reset spring. Therefore, the present invention has the advantages of simple structure and reasonable arrangement. When the present invention is started, a circuit can be quickly turned on, the contact pressure of the moving contact is high, the moment variation of the moving contact is little, the operation is reliable, the error is little, and the stability is high. When electric current exceeds rated current, repulsive force generated by the electric current can efficiently turn off the circuit. The synchronization of the moving contact and a static contact is good. The contact pressure at both ends is kept equal.
Description
Technical field
The present invention relates to a kind of circuit breaker, especially relate to a kind of current-limiting apparatus that is used for the band repulsive force mechanism of circuit breaker, with the ability that improves the disjunction short circuit current greatly and the reliability of disjunction.
Background technology
When abnormal conditions appear in electricity consumption device or circuit, need circuit breaker to make the action of fast cut-off circuit, with the damage that prevents circuit or electric equipment or on fire, this is a kind of important current limiting performance of circuit breaker.In order to improve the current limiting performance of circuit breaker, the engineers and technicians of the relevant electrical equipment in various countries producer have done many effort.For example, someone has applied for the patent of invention of " multipole circuit breaker with single pole units " (92111529.6) by name, it relates to a kind of low pressure multipole circuit breaker, have two housings, each utmost point comprises an one pole breaking units, contact and arcing chamber are arranged in the described unit, a plurality of unit are installed in forms multipole circuit breaker in the casing, wherein, moving contact is lined up can rotating bridge-shaped contact, cooperate with fixed contact, bridge-shaped contact is supported by bar block, and the bar block of each unit is fixed with two parallel rods, it utilizes two arms to link to each other with crank, one operating mechanism is fixed on top, a unit, and it has two metal rims supporting the bearing of crank, and bottom linkage rod drives crank.Though it has made some contributions in the configuration aspects that solves multipole circuit breaker, part still has some deficits at the aspects such as stability of current limiting performance.In addition, have the people to apply for the patent of invention (patent No. 97113787.0) of " being used for the current limiting of breaker device " again, it comprises by second pin-and-hole and the pilot pin that extends from the both side surface of moving contact component for this reason; Support, its part are supported moving contact component center of rotation pin two ends, so that support moving contact component rotationally; Current limliting door bolt has the curved guide surface that pilot pin slidably forms on the outer edge surface thereon, the pin-and-hole that forms support groove and be used for support rack on its other outer edge surface; Center of rotation pin in the pin-and-hole of insertion current limliting door bolt, its two ends are all inserted in the holder part; And touch spring, its two ends are supported by the support groove and the support support surface of current limliting door bolt, stop the anticlockwise power of moving contact component to produce.Though this technology provides a kind of new construction for the miniaturization of circuit breaker, its structure is still unreasonable.
Summary of the invention
The present invention solves existing current-limiting apparatus to exist action error bigger technical problems such as the less stable of active force when work.
Above-mentioned technical problem of the present invention is mainly solved by following technical proposals: be provided with the repulsion pin on described moving contact, its outer repulsion spare that is equipped with; The movable contact head end that deviates from of described repulsion spare is arranged on the support by pivot pin, and nearly movable contact head end is arranged on the support by back-moving spring.
Wherein, a kind of structure of preferable repulsion spare can be: described repulsion spare is U type shape and rides the both sides of putting at moving contact, the described movable contact head end that deviates from inwardly curves button, and be arranged on the support by pivot pin, inboard at described button is provided with back-moving spring, and the other end of back-moving spring is arranged on the nearly movable contact end place of another sheet repulsion spare.
Further concrete technical scheme is: described repulsion spare system adopts steel plate to make, its substantially two wide arm bodies be the arcuation that slightly upwarps, the end is narrow to be placed through in the end rings of back-moving spring; Described repulsion pin is cylindric, is arranged on the place, the nearly arc of base portion bottom surface of described arm body.
Both have the speed of closing faster and bigger contact pressure in order to reach, only need be slightly larger than the specified repulsion of design again and can cut off the preferred configuration effect of circuit effectively, the ratio of described repulsion pin to the arm of force between pivot pin and repulsion pin to the arm of force between back-moving spring is 1: 1.5-4.0; The line stretcher of two arm body base portions of described repulsion spare and the angle α that upwarps between the tangent line of arcuation are 5 °-18 °.General α thinks that 8 °-12 ° are advisable.
Above-mentioned technical pattern only is for a certain construction unit.In fact be to adopt several unit to constitute by the connecting hole that connecting rod passes on the support.
All circuit breakers of series under the present invention relates to naturally.
Therefore, the present invention has following characteristics: 1. and simple in structure, connection and reasonable arrangement, only needing increases by a repulsive force mechanism, makes the disjunction short-circuit capacity improve greatly; 2. the speed of closing of circuit is fast when starting, and the contact pressure of moving contact is big; 3. in making process of the present invention, motionless substantially because of the spring center line, the moment variations that acts on moving contact by repulsion is very little, and is reliable, the less good stability of error; When electric current surpasses rated current, the repulsion of its generation is open circuit effectively; 4. certain fit clearance is arranged between central shaft and the moving contact, moving contact has certain floating, and makes when closing a floodgate, when causing an end sound to touch contact earlier by the manufacturing tolerance accumulation, can make the dynamic and static contact of the other end can catch up with contact synchronously, and make the two ends contact pressure keep impartial.
Description of drawings
Accompanying drawing 1 is the structural representation that device has a kind of circuit breaker of the present invention;
Accompanying drawing 2a is the structural representation of a kind of closure state of the present invention;
Accompanying drawing 2b is the structural representation of a kind of off-state of the present invention;
Accompanying drawing 3 is perspective view of a kind of repulsion spare among the present invention;
Accompanying drawing 4 is that the A of accompanying drawing 3 is to view;
Accompanying drawing 5 is left views of accompanying drawing 4.
Embodiment
Below by embodiment, and in conjunction with the accompanying drawings, technical scheme of the present invention is described in further detail.
Embodiment: described current-limiting apparatus 40 ties up to described moving contact 10 and is provided with repulsion pin 18, its outer repulsion spare 19 that is equipped with; Described repulsion spare 19 is U type shape and rides the both sides of putting at moving contact 10, its substantially two wide arm bodies 191 be the arcuation that slightly upwarps, the end is narrow to be placed through in the end rings of back-moving spring 16; The described movable contact head end that deviates from inwardly curves button 30, and the repulsion spare of the Gou Chenging 19 whole steel plates that adopt are made (referring to accompanying drawing 3 and accompanying drawing 4) thus, and are arranged on the support 20 by pivot pin 17; Described moving contact 10 then is fixed on the support by central shaft 15, and making it can be around this rotation.Be provided with back-moving spring 16 in the inboard of described button 30, the other end of back-moving spring is arranged on nearly movable contact end 192 places of another sheet repulsion spare 19.The movable contact head end that deviates from repulsion spare is arranged on the support 20 by pivot pin 17, and repulsion spare 19 nearly movable contact head ends are arranged on the support 20 by back-moving spring 16.Described repulsion pin 18 is cylindric, is arranged on the place, the nearly arc of base portion bottom surface of described arm body 191.
For a kind of medium-sized current-limiting apparatus 40, the ratio of described repulsion pin 18 to the arm of force of 17 of pivot pins and repulsion pin 18 to the arm of force of 16 of back-moving springs can be about 1: 2.8; The line stretcher of two arm bodies, 191 base portions of described repulsion spare 19 and the angle α that upwarps between the tangent line of arc bottom surface are (referring to accompanying drawing 5) about 10 °.Current-limiting apparatus 40 with above-mentioned repulsive force mechanism is loaded in the circuit breaker again, and connecting rod and repulsive force mechanism by operating mechanism 70 are rotationally connected; Plastic handle 71 is used for manually closing branch operating mechanism 70, drives current-limiting apparatus 40 by connecting rod and does to move counterclockwise or clockwise, thereby realize movable contact head end 10 provided thereon and connection or the disjunction between the fixed contact 13.Around described fixed contact 13, be provided with arc control device 90, constitute a disjunction unit (shown in accompanying drawing 1) thus.Like this, can be axially along stretching a plurality of (for example 2-4) unit that distributes, and pass two parallel connecting holes 29 on the support 20 by two connecting rods, finish rotational action by same operating mechanism.Can be combined into two utmost points of an only operating mechanism control of need or the circuit breaker of three utmost points or four utmost points thus easily.
Repulsion spare 19 passes to moving contact 10 with pressure by repulsion pin 18 under the effect of back-moving spring 16, make support 20 be in closure state (referring to accompanying drawing 2a).Maintain certain contact pressure between the two ends of moving contact 10 and time type fixed contact 13.Simultaneously, central shaft 15 is taked matched in clearance with the centre bore of moving contact, forms certain amount of floating therebetween, is used to compensate because of manufacturing tolerance causes between the contact on moving contact two terminal contacts and the fixed contact contact the inconsistent of priority.
Central shaft 15 passes the centre bore of moving contact 10 to support other end centre bore from support 20 1 side centre bores.One end earrings of two back-moving springs 16 imports pivot pin 17, and back-moving spring 16 other ends by repulsion spare 19 around pivot pin 17 clockwise direction support outer shafts, an end hook of back-moving spring 16 is lived the cylindrical of pivot pin 17, the other end catches on the front end breach of repulsion spare 19.Two groups of back-moving springs 16 being located at both sides are symmetrical arranged.
When electrical appliance is short-circuited electric current, because two fixed contacts 13 are arranged to go back to the type loop, so and can produce the parallel conductor electromagnetic repulsion force between the moving contact; In addition, produce the node electric power between moving contact 10 and the fixed contact.When these two power on the moving contact 10 of acting on greater than contact pressure, can promote moving contact 10 and scold and hold, clockwise rotate, and short circuit current is big more scolds out speed fast more, produce electric current and arc column resistance, set up arc stream rapidly, produce current limitation effect.
Scold in the open procedure at moving contact 10, pivot pin 17 clockwise rotates around central shaft 15 with moving contact 10, and produces slide relative between the repulsion spare 19.Repulsion spare 19 is done clockwise rotating of a small amount of thereupon, and back-moving spring 16 is elongated on a small quantity.When moving contact was further scolded out, repulsion pin 18 slid into flex point, and the direction that repulsion spare 19 imposes on the power on the repulsion pin 18 takes place sharply to change, and line of action of force is crossed central shaft 15, and moving contact is by self-locking (referring to accompanying drawing 2b).Like this, when circuit breaks down, be arranged on release 50 on one side and promptly sense fault current,, drive current-limiting apparatus 40 and rotate by releasing operation mechanism 70 and connecting rod, thus the purpose of realization disengagement failure electric current; When especially big short circuit current occurring, current-limiting apparatus 40 can move prior to operating mechanism, keeps off-state, forms tangible fracture, produces significant current limliting, disjunction effect.To mechanism action, utilize the bump of moving contact and pedestal, it is resetted, get rid of the back combined floodgate second time for fault and prepare.Owing between the movable contact head end 10 of current-limiting apparatus 40 and fixed contact 13, form the double break mouth structure, can be when disjunction equal component voltage, the minimizing arc energy has improved the ability of disjunction short circuit current and the reliability of disjunction greatly.
Claims (3)
1. current-limiting apparatus with repulsive force mechanism, comprise by central shaft and be arranged on the moving contact on the support and place the fixed contact of its both sides, between moving contact and support, be provided with touch spring, generation prevents the power of contact counter-rotating, it is characterized in that on described moving contact (10), being provided with repulsion pin (18), its outer repulsion spare (19) that is equipped with; The movable contact head end that deviates from of described repulsion spare (19) is arranged on the support (20) by pivot pin (17), and nearly movable contact head end is arranged on the support (20) by back-moving spring (16); Described repulsion spare (19) is U type shape and rides the both sides of putting in moving contact (10), the described movable contact head end that deviates from inwardly curves button (30), and be arranged on the support (20) by pivot pin (17), be provided with back-moving spring (16) in the inboard of described button (30), the other end of back-moving spring is arranged on the nearly movable contact end place of another sheet repulsion spare (19).
2. the current-limiting apparatus of band repulsive force mechanism according to claim 1, it is characterized in that described repulsion spare (19) is to adopt steel plate to make, its substantially two wide arm bodies (191) be the arcuation that slightly upwarps, the end is narrow to be placed through in the end rings of back-moving spring (16); Described repulsion pin (18) is cylindric, is arranged on the place, the nearly arc of base portion bottom surface of described arm body (191).
3. the current-limiting apparatus of band repulsive force mechanism according to claim 1 and 2 is characterized in that the ratio of described repulsion pin (18) to the arm of force between pivot pin (17) and repulsion pin (18) to the arm of force between back-moving spring (16) is 1: 1.5-4.0; The line stretcher of two arm body (191) base portions of described repulsion spare (19) and the angle α that upwarps between the tangent line of arcuation are 5 °-18 °.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01143014 CN1224070C (en) | 2001-11-29 | 2001-11-29 | Current-limiting device with repulsive force mechanism |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 01143014 CN1224070C (en) | 2001-11-29 | 2001-11-29 | Current-limiting device with repulsive force mechanism |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1423295A CN1423295A (en) | 2003-06-11 |
| CN1224070C true CN1224070C (en) | 2005-10-19 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN 01143014 Expired - Fee Related CN1224070C (en) | 2001-11-29 | 2001-11-29 | Current-limiting device with repulsive force mechanism |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN1224070C (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| KR100575243B1 (en) * | 2004-04-16 | 2006-05-02 | 엘에스산전 주식회사 | Movable contactor assembly for wiring breakers |
| US7566840B2 (en) * | 2007-10-04 | 2009-07-28 | General Electric Company | Contact arm mechanism for circuit breaker |
-
2001
- 2001-11-29 CN CN 01143014 patent/CN1224070C/en not_active Expired - Fee Related
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| Publication number | Publication date |
|---|---|
| CN1423295A (en) | 2003-06-11 |
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