CN108962700B - Shielding arc-extinguishing device between circuit breaker contacts - Google Patents
Shielding arc-extinguishing device between circuit breaker contacts Download PDFInfo
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- CN108962700B CN108962700B CN201810898441.6A CN201810898441A CN108962700B CN 108962700 B CN108962700 B CN 108962700B CN 201810898441 A CN201810898441 A CN 201810898441A CN 108962700 B CN108962700 B CN 108962700B
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- circuit breaker
- arm
- arc
- insulating plate
- lock
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- 238000000034 method Methods 0.000 description 10
- 239000000463 material Substances 0.000 description 9
- 238000009826 distribution Methods 0.000 description 8
- 238000010891 electric arc Methods 0.000 description 6
- 101000581533 Homo sapiens Methylcrotonoyl-CoA carboxylase beta chain, mitochondrial Proteins 0.000 description 5
- 102100027320 Methylcrotonoyl-CoA carboxylase beta chain, mitochondrial Human genes 0.000 description 5
- 238000010586 diagram Methods 0.000 description 3
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- 238000005516 engineering process Methods 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 238000010248 power generation Methods 0.000 description 2
- 229920001169 thermoplastic Polymers 0.000 description 2
- 229920001187 thermosetting polymer Polymers 0.000 description 2
- 241001391944 Commicarpus scandens Species 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
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- 230000005520 electrodynamics Effects 0.000 description 1
- 230000005672 electromagnetic field Effects 0.000 description 1
- 229920006351 engineering plastic Polymers 0.000 description 1
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- 238000004519 manufacturing process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 229920003023 plastic Polymers 0.000 description 1
- 238000002360 preparation method Methods 0.000 description 1
Classifications
-
- 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
- H01H73/02—Details
- H01H73/18—Means for extinguishing or suppressing arc
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The shielding arc-extinguishing device comprises an insulating plate, a rotating handle, a lock catch, a jump buckle and a connecting rod, wherein one end of the rotating handle is rotationally connected with a fixed contact and is provided with an energy storage torsion spring, the insulating plate is fixed at the other end of the rotating handle, and one end of the insulating plate is provided with a locking arm; the lock catch and the jump buckle are both rotationally connected with the circuit breaker shell, the lock catch is provided with a lock head corresponding to the landing on the lock arm and a main unlocking arm corresponding to the actuating mechanism, a reset torsion spring is arranged between the lock catch and the circuit breaker shell, the jump buckle is provided with a driving arm and a driven arm, the driven arm corresponds to a clamping hook on the lock arm, and two ends of the connecting rod are respectively rotationally connected with the driving arm and the operating handle. The invention uses the energy storage torsion spring to drive the shielding arc extinguishing device to act, isolates the movable contact and the static contact of the circuit breaker at the initial stage of arc generation, forces the arc to be extinguished rapidly, thus limiting the amplification of the arc energy and improving the capacity of the circuit breaker for breaking short-circuit current and direct-current critical load current.
Description
Technical Field
The invention relates to a device capable of effectively preventing a large arc from being generated between a movable contact and a static contact of a circuit breaker when the circuit breaker breaks current (including short-circuit current), and belongs to the technical field of emergency protection devices.
Background
Miniature circuit breakers and plastic shell type circuit breakers (MCB, MCCB) are important electrical components in industrial and civil low-voltage distribution equipment, are mostly applied to the tail ends or branches of low-voltage distribution systems, and are used for protecting overload and short-circuit faults of distribution lines and are used as switches for carrying out infrequent breaking at ordinary times. The circuit breaker generates a plasma arc (the arc is conductive) with great energy between a moving contact and a fixed contact when breaking the short-circuit current because the short-circuit current of a circuit is very large during the short-circuit fault. In addition, when the photovoltaic power generation system or various direct current distribution systems are applied, besides short-circuit fault current, critical load current (although the current value is not large) is not easy to break, and the circuit breaker can complete the task of breaking the short-circuit current or the critical load current only by rapidly extinguishing the electric arc through certain technical measures.
At present, both the domestic and foreign MCB and the MCCB adopt an arc extinguishing chamber technology to cool and extinguish a high-temperature high-voltage arc generated when the short-circuit current is broken, and the arc extinguishing principle of the technology is as follows: when the short-circuit current is disconnected, after the electric arc is generated between the movable contact and the fixed contact and the energy is correspondingly amplified to a certain length, the high-energy electric arc is driven into the arc extinguishing chamber by adopting magnetic field electrodynamic force or other modes, so that the high-energy electric arc is extinguished under the cooling action of the metal grid sheet in the arc extinguishing chamber. The arc extinguishing effect of the method is affected by factors such as arc extinguishing chamber materials, contact opening speed, contact opening distance, contact materials and the like, particularly for a circuit breaker with a single-breakpoint structure, the capacity of breaking short-circuit current or direct-current critical load current is poor, if the performance parameters are required to be improved, the manufacturing cost is greatly increased, and in a new energy source such as a photovoltaic direct-current system, a track traffic and other branch distribution system, the direct-current short-circuit current is very difficult to achieve due to the fact that a zero crossing process and the breaking of the critical load current are not carried out.
With the construction of a power distribution network, particularly a direct current power distribution network, new energy power generation and improvement of the reliability requirements of people on the power grid, a novel arc extinguishing method of a circuit breaker is needed objectively so as to greatly improve the capacity of breaking short-circuit current or critical load current of an MCB and an MCCB and realize the generalization of products in the field of alternating current and direct current power distribution.
Disclosure of Invention
The invention aims at overcoming the defects of the prior art and provides a shielding arc-extinguishing device between contacts of a circuit breaker so as to improve the capacity of the circuit breaker for breaking short-circuit current and direct-current critical load current.
The problems of the invention are solved by the following technical proposal:
The utility model provides a shielding arc-extinguishing device between circuit breaker contacts, is constituted including insulation board, energy storage torsional spring, establishes slide rail, turning handle, hasp, jump knot and the connecting rod on the circuit breaker shell, the rotation center of turning handle is equipped with the pivot, and the pivot supports on the circuit breaker shell, still is equipped with energy storage torsional spring on the pivot, the rotation center of turning handle intersects with the perpendicular line that movable contact, stationary contact are located; the insulating plate is fixed at the other end of the rotating handle and corresponds to a gap between a movable contact and a fixed contact of the circuit breaker, and a locking arm is arranged at one end of the insulating plate; the lock catch and the jump buckle are both rotationally connected with the circuit breaker shell, the lock catch is provided with a lock head corresponding to the landing on the lock arm and a main unlocking arm corresponding to the action mechanism of the circuit breaker, a reset torsion spring is arranged between the lock catch and the circuit breaker shell, the jump buckle is provided with a driving arm and a driven arm, the driven arm corresponds to the clamping hook on the lock arm, and two ends of the connecting rod are respectively in transmission connection with the driving arm of the jump buckle and the operation handle of the circuit breaker.
The shielding arc-extinguishing device between the circuit breaker contacts is characterized in that the lock catch is also provided with a secondary unlocking arm corresponding to an electromagnetic release ejector rod of the circuit breaker.
The shielding arc extinguishing device between the circuit breaker contacts is characterized in that the insulating plate is provided with a sliding rail, and the sliding rail is arranged on the circuit breaker shell.
According to the shielding arc-extinguishing device between the breaker contacts, the insulating plate, the rotating handle and the locking arm form an integral insulating shielding piece.
The invention uses the energy storage torsion spring to drive the shielding arc extinguishing device to act, isolates the movable contact and the fixed contact of the circuit breaker at the initial stage of arc generation, forces the arc to be extinguished rapidly, thus limiting the amplification of the arc energy, realizing the reliable breaking of the circuit breaker, and improving the capacity of the circuit breaker for breaking short-circuit current and direct current critical load current.
Drawings
Fig. 1 is a schematic diagram of the whole structure of a shielding arc extinguishing device between contacts of a circuit breaker (non-shielding state when moving and static contacts are closed);
Fig. 2 is a schematic diagram of a shielding arc extinguishing device between contacts of a circuit breaker (shielding state when moving and static contacts are separated);
FIG. 3 is an enlarged view of a portion of FIG. 1;
FIG. 4 is a schematic diagram of an insulation shield;
FIG. 5 is a left side view of FIG. 4;
FIG. 6 is a schematic illustration of a latch;
fig. 7 is a schematic illustration of a trip button.
The reference numerals in the drawings are respectively as follows: 1. a circuit breaker housing; 2. a stationary contact; 3. a moving contact; 4. an insulating shield; 4-1, insulating plate; 4-2, rotating handles; 4-3, locking arm; 5. locking; 5-1, locking head; 5-2, a main unlocking arm; 5-3, auxiliary unlocking arms; 6. jumping buckle; 6-1, a driven arm; 6-2, an active arm; 7. a connecting rod; 8. an operation handle; 9. An action mechanism; 10. an electromagnetic trip; 10-1, an ejector rod of the electromagnetic release; 11. an overload trip element; 12. an arc extinguishing chamber; 13. a mechanism link; 14. a tension spring; 15. an energy storage torsion spring; 16. a reset torsion spring; A. a slide rail; B. a rotating shaft; C. a shaft pin; D. a hook; E. a shaft; F. the action mechanism is hung at a buckling point; G. a landing; H. and a pin shaft.
Detailed Description
The invention is described in further detail below with reference to the accompanying drawings.
It is obvious that the drawings in the following description are one embodiment of the invention in an MCB, from which other drawings can be obtained without inventive effort for a person skilled in the art.
The embodiment of the invention is a shielding arc-extinguishing device driven by spring force and arranged between a moving contact and a fixed contact of an MCB, when overload current, short-circuit fault current and normal breaking of any load current value occur to a circuit, the shielding arc-extinguishing device can rapidly act under the drive of energy storage spring force, an insulating shielding layer (namely an insulating plate 4-1 in the figure) is inserted between the fixed contact and the moving contact of the MCB, and the moving contact and the fixed contact are reliably isolated by the insulating shielding layer, so that an electric arc is extinguished in the initial stage of generation.
When the MCB is switched on again through the operating handle, the shielding arc extinguishing device is pulled to reset through the operating handle and the corresponding transmission mechanism, and the energy storage spring (namely the energy storage torsion spring 15 in the figure) stores energy again, so that the MCB is ready to enter the next working cycle.
Referring to fig. 1-3, the shielding arc extinguishing device mainly comprises an insulating shielding piece 4, an energy storage torsion spring 15, a lock catch 5, a reset torsion spring 16, a jump buckle 6, a connecting rod 7, a sliding rail a, a rotating shaft B and a shaft pin C. Wherein the insulating shield 4 is constituted by an insulating plate 4-1, a swivel handle 4-2 and a locking arm 4-3.
The insulating shield 4 and the energy storage torsion spring 15 are arranged below the fixed contact 2 through a rotating shaft B, the insulating plate 4-1 of the insulating shield 4 can swing clockwise and anticlockwise in a sliding rail A arranged on the circuit breaker shell 1, when the insulating plate swings anticlockwise to the end, the front end of the insulating plate is inserted into a closed groove arranged in front of the sliding rail A, and when the insulating plate swings clockwise to the end, the insulating plate is limited by the sliding rail A. The lock catch 5 and the reset torsion spring 16 are arranged on the right side of the fixed contact 2 and below the action mechanism 9 through the shaft pin C, and the lock head 5-1 on the lock catch 5 corresponds to the landing G on the right side of the lock arm 4-3.
In the MCB closing state, the insulating shielding member 4 is in a non-shielding state, the energy storage torsion spring 15 is in an energy storage state, and the state is maintained by hanging and buckling the lock head 5-1 of the lock catch 5 and the landing G of the lock arm 4-3. When the MCB breaks any load current due to overload and short circuit of a circuit or normally through an operating handle 8 to realize breaking, the actuating mechanism 9 and the electromagnetic release 10 can trigger the lock catch 5 to overcome the counter-clockwise rotation of the reset torsion spring force of the electromagnetic release ejector rod 10-1, so that the lock catch 5 and the insulating shielding piece 4 can rapidly trip, the insulating shielding piece 4 moves counter-clockwise under the action of the energy storage torsion spring 15, and the moving contact 3 and the fixed contact 2 which are simultaneously opened are completely shielded and isolated rapidly, so that the purposes of rapidly extinguishing an electric arc and reliably breaking are achieved.
The operating handle 8 rotates clockwise to the opening position under the action of the torsion spring in the operating handle, and meanwhile, the driving arm 6-2 of the jump button 6 is pushed by the connecting rod 7, so that the jump button 6 rotates clockwise, the end part of the driven arm 6-1 of the jump button 6 reaches a position opposite to the clamping hook D at the end part of the locking arm 4-3 (in the process, slight backward elastic deformation is required at the clamping hook D of the locking arm 4-3), and the insulating shielding piece 4 is stirred for resetting when the next MCB is closed.
When the switch is opened, several methods for realizing shielding are as follows:
1. When the MCB needs to be opened due to the overload current of a circuit, the overload tripping element 11 (the bimetal material is bent towards the direction of the low-expansion material after being heated) is heated and bent under the action of the overload current, and the action mechanism 9 is pulled by the pull rod on the left side of the overload tripping element, so that the tripping element trips at the action mechanism hanging and buckling point F to lose stability, and the action mechanism 9 rapidly and clockwise rotates by taking the shaft E as a center under the action of the tension spring 14 to drive the movable contact 3 to be opened.
When the action mechanism 9 rotates clockwise, the front end of the action mechanism contacts with the main unlocking arm 5-2 of the lock catch 5, so that the lock catch 5 rotates anticlockwise against the elasticity of the reset torsion spring 16, and the lock head 5-1 and the landing G of the locking arm 4-3 are tripped, so that the insulating shielding piece 4 rotates anticlockwise under the action of the energy storage torsion spring 15, and the complete shielding and isolation process is realized;
2. when the MCB needs to be opened due to the short-circuit current of a circuit, an electromagnetic release ejector rod 10-1 in the electromagnetic release 10 moves upwards rapidly under the action of an electromagnetic field, an auxiliary unlocking arm 5-3 of a top-moving lock catch 5, and the lock catch 5 rotates anticlockwise to enable a locking head 5-1 to be released from a landing G of the locking arm 4-3, so that an insulating shielding piece 4 rotates anticlockwise under the action of an energy storage torsion spring 15, and a complete shielding isolation process is realized.
The ejector rod 10-1 of the release simultaneously pushes the actuating mechanism 9 to rotate clockwise, so that the release is released at the hanging and buckling point F of the actuating mechanism to lose stability, and the actuating mechanism 9 rapidly rotates clockwise by taking the shaft E as the center under the action of the tension spring 14 to drive the movable contact 3 to break off;
3. When the MCB normally breaks any load current through the operating handle, the operating handle 8 rotates clockwise, and when the mechanism connecting rod 13 connecting the operating handle 8 and the actuating mechanism 9 rotates clockwise at the joint of the operating handle 8, the actuating mechanism 9 rapidly rotates clockwise by taking the shaft E as the center under the action of the tension spring 14 after passing through the connection line of the rotation center of the operating handle 8 and the supporting point of the actuating mechanism 9, and drives the moving contact 3 to break.
When the action mechanism 9 rotates clockwise, the front end of the action mechanism contacts with the main unlocking arm 5-2 of the lock catch 5, so that the lock catch 5 rotates anticlockwise against the elasticity of the reset torsion spring 16, and the lock head 5-1 and the landing G of the locking arm 4-3 are tripped, so that the insulating shielding piece 4 rotates anticlockwise rapidly under the action of the energy storage torsion spring 15, and the complete shielding isolation process is realized.
In the MCB open state, the insulating shield 4 is in the shielding state and the energy storage torsion spring 15 is in the energy release state. When the MCB is switched on through the operating handle 8, the operating handle 8 pulls the jump button 6 to rotate anticlockwise by taking the pin shaft H as the center through the connecting rod 7 connected with the driving arm 6-2 of the jump button 6 when the operating action mechanism 9 finishes switching on, the driven arm 6-1 of the jump button 6 is overlapped with the clamping hook D of the locking arm 4-3, the insulating shielding piece 4 is shifted to rotate clockwise for resetting and storing energy, and the jump button 6 keeps rotating a small amount to enable the insulating shielding piece 4 to be unhooked with the clamping hook D of the locking arm 4-3 after the insulating shielding piece 4 is shifted for resetting and storing energy, so that shielding preparation during switching off of the MCB next time is finished.
The insulating shielding piece 4, the lock catch 5, the jump buckle 6 and other parts are made of engineering plastic materials with high strength and high temperature resistance. Can ensure the technical requirements specified by the product standard.
It is obvious that the method of the invention can be used for various types of circuit breakers, such as MCB, MCCB and other products with various structural forms.
The general principles presented herein may be applied to other embodiments without departing from the spirit or scope of the invention.
After the shielding and arc extinguishing methods described herein are applied to MCB and MCCB products in different forms, the following technical progress can be achieved:
1. The capability of the product for breaking the AC/DC short-circuit fault current can be greatly improved;
2. The problem that the critical load current is difficult to effectively break (especially the direct current critical load current) can be solved;
3. When the short-circuit fault current is disconnected, the further amplification of the arc energy can be limited, so that the product can shorten the flashover distance outwards or realize zero flashover;
4. Because the amplification of arc energy during breaking short-circuit fault current can be effectively limited, part of the thermosetting plastic materials which are not recycled in the original design products can be replaced by the thermoplastic plastic materials which can be recycled (the strength of the thermosetting plastic materials is larger than that of the thermoplastic plastic materials), and the related requirements of the environmental protection field are met.
Claims (2)
1. The shielding arc-extinguishing device is used for improving the capacity of a circuit breaker for breaking short-circuit current and direct-current critical load current, isolating a movable contact and a fixed contact of the circuit breaker at the initial stage of arc generation and forcing the arc to be extinguished rapidly so as to limit the amplification of arc energy, and is characterized by comprising an insulating plate (4-1), a rotating handle (4-2), a lock catch (5), a jump catch (6) and a connecting rod (7), wherein the rotating center of the rotating handle (4-2) is provided with a rotating shaft which is supported on a circuit breaker shell, and an energy storage torsion spring (15) is further arranged on the rotating shaft, and the rotating center of the rotating handle (4-2) is intersected with a perpendicular line where the movable contact and the fixed contact are positioned; the insulating plate (4-1) is fixed at the other end of the rotating handle (4-2) and corresponds to a gap between a movable contact and a fixed contact of the circuit breaker, and a locking arm (4-3) is arranged at one end of the insulating plate (4-1);
the insulating plate (4-1) is provided with a corresponding sliding rail (A), and the sliding rail (A) is fixed on the circuit breaker shell (1); the insulating plate (4-1) swings clockwise and anticlockwise in a sliding rail (A) arranged on the circuit breaker shell (1); when the clockwise swing reaches the end, the front end of the device is inserted into a closed groove arranged in front of the sliding rail (A), and when the clockwise swing reaches the end, the device is limited by the sliding rail (A);
the lock catch (5) and the jump button (6) are both rotationally connected with the circuit breaker shell (1), the lock catch (5) is provided with a lock head (5-1) corresponding to a landing (G) on the lock arm (4-3) and a main unlocking arm (5-2) corresponding to an actuating mechanism (9) of the circuit breaker, a reset torsion spring (16) is arranged between the lock catch (5) and the circuit breaker shell (1), the jump button (6) is provided with a driving arm (6-2) and a driven arm (6-1), the driven arm (6-1) corresponds to a clamping hook (D) on the lock arm (4-3), and two ends of the connecting rod (7) are respectively in transmission connection with a driving arm (6-2) of the jump button (6) and an operating handle (8) of the circuit breaker;
the lock catch (5) is also provided with an auxiliary unlocking arm (5-3) corresponding to the electromagnetic release ejector rod (10-1) of the circuit breaker.
2. The device according to claim 1, characterized in that the insulating plate (4-1), the swivel (4-2) and the locking arm (4-3) form a unitary insulating shield (4).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810898441.6A CN108962700B (en) | 2018-08-08 | 2018-08-08 | Shielding arc-extinguishing device between circuit breaker contacts |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810898441.6A CN108962700B (en) | 2018-08-08 | 2018-08-08 | Shielding arc-extinguishing device between circuit breaker contacts |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN108962700A CN108962700A (en) | 2018-12-07 |
| CN108962700B true CN108962700B (en) | 2024-09-13 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201810898441.6A Active CN108962700B (en) | 2018-08-08 | 2018-08-08 | Shielding arc-extinguishing device between circuit breaker contacts |
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| Country | Link |
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| CN (1) | CN108962700B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109586176B (en) * | 2018-12-20 | 2020-12-04 | 乐清市鑫艺科技有限公司 | Distance circular arc blowing device of high-voltage transformer cabinet |
| CN110931327A (en) * | 2019-12-31 | 2020-03-27 | 邹耿彪 | Baffle arc control device and have baffle arc control device's circuit breaker |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104637744A (en) * | 2015-03-05 | 2015-05-20 | 台安科技(无锡)有限公司 | Quick tripping mechanism for short-circuit of miniature circuit breaker |
| CN107359067A (en) * | 2017-08-23 | 2017-11-17 | 河北宝凯电气股份有限公司 | A kind of miniature circuit breaker with stronger arc extinguishing ability |
| CN208806215U (en) * | 2018-08-08 | 2019-04-30 | 河北宝凯电气股份有限公司 | A kind of blow-out arc-control device applied to miniature circuit breaker |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4484045A (en) * | 1982-08-16 | 1984-11-20 | General Electric Company | Molded case circuit breaker having improved arc resistant properties |
| CN102034652B (en) * | 2010-12-22 | 2013-11-06 | 上海良信电器股份有限公司 | Operating mechanism for molded case circuit breaker |
| CN107342199B (en) * | 2017-08-23 | 2020-01-14 | 河北宝凯电气股份有限公司 | Housing type shielding arc extinguishing mechanism |
| CN207542173U (en) * | 2017-12-19 | 2018-06-26 | 上海永继电气股份有限公司 | Double breaking points small type circuit breaker operating mechanism |
-
2018
- 2018-08-08 CN CN201810898441.6A patent/CN108962700B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104637744A (en) * | 2015-03-05 | 2015-05-20 | 台安科技(无锡)有限公司 | Quick tripping mechanism for short-circuit of miniature circuit breaker |
| CN107359067A (en) * | 2017-08-23 | 2017-11-17 | 河北宝凯电气股份有限公司 | A kind of miniature circuit breaker with stronger arc extinguishing ability |
| CN208806215U (en) * | 2018-08-08 | 2019-04-30 | 河北宝凯电气股份有限公司 | A kind of blow-out arc-control device applied to miniature circuit breaker |
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| CN108962700A (en) | 2018-12-07 |
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