CN107342178B - High-breaking miniature circuit breaker - Google Patents
High-breaking miniature circuit breaker Download PDFInfo
- Publication number
- CN107342178B CN107342178B CN201710727738.1A CN201710727738A CN107342178B CN 107342178 B CN107342178 B CN 107342178B CN 201710727738 A CN201710727738 A CN 201710727738A CN 107342178 B CN107342178 B CN 107342178B
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- China
- Prior art keywords
- contact
- moving contact
- swing rod
- shielding plate
- circuit breaker
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H9/00—Details of switching devices, not covered by groups H01H1/00 - H01H7/00
- H01H9/30—Means for extinguishing or preventing arc between current-carrying parts
- H01H9/34—Stationary parts for restricting or subdividing the arc, e.g. barrier plate
-
- 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
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- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
A high-breaking miniature circuit breaker comprises a fixed contact, a movable contact connected with a tripping mechanism and an insulating arc-extinguishing mechanism, wherein the insulating arc-extinguishing mechanism comprises an insulating shielding plate, an armature, a U-shaped magnetic yoke, a driving oscillating bar and a driven oscillating bar, and the insulating shielding plate is positioned below the movable contact of the circuit breaker and corresponds to a gap between the movable contact and the fixed contact; the driving swing rod and the driven swing rod are parallel to each other and form a four-bar structure with the moving contact and the insulation shielding plate; the armature is positioned above the moving contact and is fixed on a rotating handle at the upper end of the driving oscillating bar; the U-shaped magnetic yoke is sleeved on the movable contact from the lower part and corresponds to the armature; and a torsional spring is arranged between the driving oscillating bar and the moving contact. The insulating shielding plate can be rapidly inserted between the movable contact and the fixed contact when the breaker breaks the short-circuit current, so that the electric arc is extinguished, the amplification time of the electric arc energy is shortened, the short flashover or no flashover of the breaker is realized, and the capacity of the breaker for breaking the short-circuit current is greatly improved.
Description
Technical Field
The invention relates to a miniature circuit breaker with strong short-circuit current breaking capacity, and belongs to the technical field of emergency protection devices.
Background
The Miniature Circuit Breaker (MCB) is an important electrical component in industrial and civil low-voltage distribution equipment, and is often applied to the tail end of a low-voltage distribution system to protect overload and short-circuit faults of a distribution line. The short-circuit fault protection is the most important function, and because the short-circuit current of a line is very large during short-circuit fault, plasma electric arcs with very large energy can be generated between a moving contact and a static contact of the breaker when the breaker breaks the short-circuit current, the electric arcs can be quickly extinguished only through a preset arc extinguishing component, and the breaker can complete the task of breaking the short-circuit current.
At present, MCBs at home and abroad adopt an arc extinguishing chamber technology to cool and extinguish high-temperature and high-voltage electric arcs generated when short-circuit current is disconnected, and the arc extinguishing principle of the technology is as follows: when the short-circuit current is cut off, after the electric arc is generated between the moving contact and the static contact and is stretched to a certain length and the energy is correspondingly amplified, the high-energy electric arc is driven to enter the arc extinguish 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 extinguish chamber. The arc extinguishing effect of the method is influenced by factors such as arc extinguishing chamber materials, contact opening speed, contact opening distance, contact materials and the like, particularly for the circuit breaker with a single-breakpoint structure, the capacity of breaking short-circuit current is poor, the capacity of breaking the short-circuit current is generally not more than 230V of alternating current and 6kA of the alternating current, and the direct-current short-circuit current is not easy to break due to the fact that a zero-crossing process does not exist.
With the construction and development of a power grid and the improvement of the reliability requirement of people on the power grid, a new arc extinguishing scheme is objectively needed to greatly improve the capacity of the MCB for breaking the short-circuit current.
Disclosure of Invention
The invention aims to provide a high-breaking miniature circuit breaker aiming at the defects of the prior art so as to improve the breaking capacity of short-circuit current.
The problem of the invention is realized by the following technical scheme:
a high-breaking miniature circuit breaker comprises a shell, a fixed contact, a movable contact, a tripping mechanism and an arc extinguish chamber, wherein after improvement, the miniature circuit breaker is additionally provided with an insulating arc extinguish mechanism, the insulating arc extinguish mechanism comprises an insulating shielding plate, an armature, a U-shaped magnetic yoke, a driving swing rod and a driven swing rod, and the insulating shielding plate is positioned below the movable contact of the circuit breaker and corresponds to a gap between the movable contact and the fixed contact; the driving swing rod and the driven swing rod are parallel to each other and form a four-bar structure with the moving contact and the insulation shielding plate; the armature is positioned above the moving contact and is fixed on a rotating handle at the upper end of the driving oscillating bar; the U-shaped magnetic yoke is sleeved on the movable contact from the lower part and corresponds to the armature; and a torsional spring is arranged between the driving oscillating bar and the moving contact.
According to the high-breaking miniature circuit breaker, two sides of the insulating shielding plate are bent upwards, one end, away from the contact surface of the moving contact and the static contact, of the bent part is rotatably connected with the driving swing rod, one end, close to the contact surface of the moving contact and the static contact, of the bent part is rotatably connected with the driven swing rod, and the rotating handle at the upper end of the driving swing rod is located on one side away from the driven swing rod.
The high-breaking small circuit breaker is characterized in that the two driving swing rods and the two driven swing rods are arranged and symmetrically arranged on two sides of the insulation shielding plate and the two moving contacts, and two ends of the armature are respectively connected with the rotating handles at the upper ends of the two driving swing rods.
Above-mentioned high disconnected miniature circuit breaker, initiative pendulum rod and turning handle adopt integral type structure.
Above-mentioned high disconnected miniature circuit breaker that divides, still be equipped with the explosion chamber in the circuit breaker casing.
The invention adds the insulation shielding plate as an auxiliary arc extinguishing mechanism, the auxiliary arc extinguishing mechanism can rapidly act at the moment that the breaker breaks the short-circuit current and is inserted between the moving contact and the static contact, and the electric arc just generated between the moving contact and the static contact is extinguished or reduced, so that the amplification time of electric arc energy is shortened, the concentration of electric arc energy is reduced, and the short flashover or no flashover of the breaker is realized. The invention adopts two-stage arc extinction, and the electric arc after the initial auxiliary arc extinction can be introduced into the arc extinction chamber to continue the subsequent arc extinction operation, thereby greatly improving the arc extinction capability of the circuit breaker and greatly improving the short-circuit current breaking capability of the circuit breaker.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic diagram of the structure of an insulating arc extinguishing mechanism;
FIG. 3 is a view from the direction A of FIG. 2;
FIG. 4 shows the contact in the repelled and shielded state;
fig. 5 is a circuit breaker trip open condition;
fig. 6 is a schematic structural view of the trip mechanism;
FIG. 7 is a schematic view of a movable contact structure;
FIG. 8 is a top view of FIG. 7;
FIG. 9 is a schematic view of the connection of the armature to the active rocker;
FIG. 10 is a left side view of FIG. 9;
FIG. 11 is a schematic view of the structure of the dielectric shield;
FIG. 12 is a left side view of FIG. 11;
FIG. 13 is a schematic structural view of a U-shaped yoke;
fig. 14 is a left side view of fig. 13.
The list of labels in the figure is: 1. static contact; 2. a moving contact; 3. a driven swing rod; 4. an insulating shield plate; 5. a torsion spring; 6. an armature; 7. a U-shaped magnetic yoke; 8. a torsion spring; 9. a tripping mechanism; 9-1, locking; 9-2, moving contact rocker arms; 9-3, jumping and buckling; 9-4, connecting rod; 9-5, a tension spring; 10. a magnetic trip push rod; 11. an upper articulated shaft; 12. a lower hinge shaft; 13. an active swing link; 14. a handle is rotated; 15. an arc extinguishing chamber; 16. a handle; A. a moving contact rotating shaft; B. a locking pin shaft; C. jump and detain round pin axle.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings.
The invention installs an insulating arc-extinguishing mechanism driven by electromagnetic force on the moving contact of the breaker, at the moment of short-circuit fault, the moving contact and the static contact are not opened completely in the arc stagnation stage (energy is not amplified), and the moving contact and the static contact are repelled by the electric repulsion force, and the mechanism is rapidly inserted between the moving contact and the static contact. The electric arc is extinguished in an insulation shielding mode, so that the capacity of breaking the short-circuit current of the MCB is greatly improved.
Referring to fig. 1-6, the invention mainly includes a static contact 1, a moving contact 2, a tripping mechanism 9, a magnetic tripping push rod 10, an arc extinguish chamber 15 and an insulation arc extinguishing mechanism which are installed in a shell of the circuit breaker, wherein, a rotating hinge type repulsion structure is adopted between the static contact 1 and the moving contact 2, the moving contact 2 is installed on a moving contact rocker 9-2 of the tripping mechanism 9 through a moving contact rotating shaft a, the magnetic tripping push rod 10 is arranged below the tripping mechanism 9 and corresponds to a latch 9-1 of the tripping mechanism 9; the tripping mechanism 9 is also provided with a torsion spring 8 for pressing the moving contact 2 on the static contact 1. The insulating arc extinguishing mechanism comprises a driven swing rod 3, a driving swing rod 13, an insulating shielding plate 4, a torsion spring 5, an armature 6 and a U-shaped magnetic yoke 7. The insulating shielding plate 4, the driving swing rod 13, the driven swing rod 3 and the movable contact 2 of the circuit breaker form a four-bar mechanism, the driven swing rod 3 is hinged between the movable contact 2 and the insulating shielding plate 4 through an upper hinge shaft 11 and a lower hinge shaft 12, the driving swing rod 13 is also hinged between the movable contact 2 and the insulating arc extinguishing member 4, the armature 6 is connected with the upper end of the driving swing rod 13 through a rotating handle 14, a U-shaped magnetic yoke 7 is installed on the movable contact 2 and corresponds to the armature 6, a torsion spring 5 is installed between the movable contact 2 and the driving swing rod 13 (or the rotating handle 14), and at ordinary times, due to the effect of the torsion spring 5 on the driving swing rod 13 (or the rotating handle 14), the insulating arc extinguishing mechanism is in an open. When short-circuit current occurs in a circuit, because the current directions of the static contact 1 and the moving contact 2 are opposite, electric repulsion force is generated to repel the static contact 1 and the moving contact 2, meanwhile, because the U-shaped magnetic yoke 7 generates electromagnetic attraction force on the armature 6 after being magnetized by the short-circuit current, the armature 6, the driving swing rod 13 and the rotating handle 14 overcome the elasticity of the torsion spring 5 to generate clockwise rotation, so that the insulating arc extinguishing device with the four-bar structure is driven to act, and the insulating shielding plate 4 of the insulating arc extinguishing device is rapidly inserted between the moving contact 2 and the static contact 1 while the moving contact and the static contact are repelled, thereby achieving the purpose of. Meanwhile, the magnetic tripping push rod 10 of the MCB pushes the tripping mechanism 9 (mature design) to rotate clockwise around the locking pin shaft B to realize tripping and disconnection, and the handle 16 is positioned at the switch opening position to finish the breaking process of the MCB. The arc extinguish chamber 15 is designed originally and does not influence the insulating arc extinguish mechanism. And after the short-circuit current disappears, the insulating arc-extinguishing device returns to the original position.
The insulation shielding plate 4 is made of high-strength and high-temperature-resistant engineering plastic materials. The number of times (3 times at most) of effectively breaking the short-circuit current specified by the product standard can be ensured.
The insulating shielding plate 4 is used as an auxiliary arc extinguishing mechanism to form a two-stage arc extinguishing device with the arc extinguishing chamber 15, the auxiliary arc extinguishing mechanism is used for extinguishing arcs when the moving contact and the static contact are not completely opened, and the arc extinguishing chamber 15 has a good residual arc extinguishing effect after the moving contact and the static contact are completely opened.
The tripping mechanism 9 comprises a lock catch 9-1, a moving contact rocker 9-2, a trip catch 9-3, a connecting rod 9-4 and a tension spring 9-5, wherein the lock catch 9-1 and the moving contact rocker 9-2 are arranged on a bracket of a breaker shell through a lock catch pin shaft B, and a magnetic trip push rod 10 is arranged on the breaker shell below the lock catch 9-1; the jump buckle 9-3 is hinged at one end of the moving contact rocker arm 9-2 close to the handle through a jump buckle pin shaft C, and the jump buckle 9-3 is movably connected with the handle 16 through a connecting rod 9-4; the other end of the moving contact rocker 9-2 is hinged with the tail end of the moving contact 2 through a moving contact rotating shaft A; one end of a tension spring 9-5 is connected with the position, between the lock catch pin B and the jump catch pin C, of the moving contact rocker arm 9-2, and the other end of the tension spring is fixed on a support shaft at the far end of the breaker shell.
The tripping mechanism 9 is also provided with a torsion spring 8; the torsion spring is arranged on the moving contact 2 and the moving contact rocker arm 9-2 through a moving contact rotating shaft A, and the torsion spring 8 can enable the head of the moving contact 2 to be in close contact with the static contact 1 and keep a certain pressure in a closing state.
The metal strip of the static contact 1 at least comprises a straight section parallel to the moving contact 2, the direction of current in the straight section is opposite to that of current in the moving contact 2, and the length of the straight section is more than or equal to the length required by repulsion force generated when short-circuit current flows in the moving contact and the static contact to repel each other.
The operating principle of the tripping mechanism 9 is as follows:
before a short-circuit fault current occurs in a power distribution system and the short-circuit current does not reach a peak value, an electric repulsion force is generated between a moving contact and a static contact due to the fact that the directions of currents on straight sections of the moving contact 2 and the static contact 1 are opposite, the moving contact 2 overcomes the torsion action of a torsion spring 8 under the action of an electric force, firstly rotates clockwise around a rotating shaft A of the moving contact and repels the static contact 1, and meanwhile, an insulating arc extinguishing mechanism acts, so that the short-circuit current is effectively limited at the initial stage of the short-circuit fault; then, a magnetic tripping push rod 10 in a coil of the magnetic backup protection tripping device rapidly drives a lock catch 9-1 in a tripping mechanism 9 to rotate clockwise around a lock catch pin B under the action of a magnetic field, at the moment, the lock catch 9-1 and a trip catch 9-3 are disconnected at the lap joint of a point D (see figure 6), the trip catch 9-3 rotates clockwise around a trip catch pin C after losing support, a moving contact rocker 9-2 loses support of a connecting rod 9-4 at the same time, and rotates clockwise around the lock catch pin B under the action of a tension spring 9-5, the tripping mechanism 9 integrally moves clockwise, and a switch is disconnected. Before the short-circuit current reaches the maximum value, the repulsive force between the moving contact and the static contact is repelled in advance, so that the purpose of improving the short-circuit breaking capacity is achieved.
Due to the adoption of the technical scheme, the MCB can achieve the following technical progress:
1, the capacity of breaking short-circuit current of a product can be greatly improved;
2. the purpose of alternating current and direct current is achieved;
3. when the fault short-circuit current is cut off, the further expansion of the arc energy can be limited, so that short arcing or no arcing of the product can be realized.
Claims (4)
1. A high-breaking miniature circuit breaker comprises a shell, a fixed contact, a moving contact, a tripping mechanism and an arc extinguish chamber, and is characterized in that the arc extinguish mechanism is additionally arranged, the arc extinguish mechanism comprises an insulating shielding plate (4), an armature (6), a U-shaped magnetic yoke (7), a driving swing rod (13) and a driven swing rod (3), and the insulating shielding plate (4) is positioned below the moving contact (2) of the circuit breaker and corresponds to a gap between the moving contact and the fixed contact; the driving swing rod (13) and the driven swing rod (3) are parallel to each other and form a four-bar structure with the moving contact (2) and the insulating shielding plate (4); the armature (6) is positioned above the moving contact (2) and is fixed on a rotating handle (14) at the upper end of the driving swing rod (13); the U-shaped magnetic yoke (7) is sleeved on the moving contact (2) from the lower part and corresponds to the armature (6); a torsion spring (5) is arranged between the driving swing rod (13) and the moving contact (2);
the insulating shielding plate (4) is used as an auxiliary arc extinguishing mechanism to form a two-stage arc extinguishing device with the arc extinguishing chamber (15), the auxiliary arc extinguishing mechanism is used for extinguishing arcs when the moving contact and the static contact are not completely opened, and the arc extinguishing chamber (15) has a good residual arc extinguishing effect after the moving contact and the static contact are completely opened;
the two sides of the insulation shielding plate (4) are bent upwards, one end of the bent part, which is far away from the contact surface of the moving contact (2) and the static contact (1), is rotatably connected with the driving swing rod (13), one end, which is close to the contact surface of the moving contact (2) and the static contact (1), is rotatably connected with the driven swing rod (3), and a rotating handle (14) at the upper end of the driving swing rod (13) is positioned on one side, which is far away from the driven swing rod (3).
2. A high breaking miniature circuit breaker according to claim 1, wherein the metal strip of the stationary contact (1) comprises at least one flat section parallel to the movable contact (2), the current in the flat section is opposite to the current in the movable contact (2), and the length of the flat section is greater than or equal to the length required for generating the repulsive force to repel the movable and stationary contacts when the short-circuit current flows through the movable and stationary contacts.
3. A high breaking miniature circuit breaker according to claim 1, characterized in that two driving swing rods (13) and two driven swing rods (3) are provided, and are symmetrically arranged on two sides of the insulation shielding plate (4) and the movable contact (2), and two ends of the armature (6) are respectively connected with the rotating handles (14) at the upper ends of the two driving swing rods (13).
4. A high breaking miniature circuit breaker according to claim 1, wherein said active swing link (13) and said rotating handle (14) are of an integral structure.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727738.1A CN107342178B (en) | 2017-08-23 | 2017-08-23 | High-breaking miniature circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710727738.1A CN107342178B (en) | 2017-08-23 | 2017-08-23 | High-breaking miniature circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107342178A CN107342178A (en) | 2017-11-10 |
| CN107342178B true CN107342178B (en) | 2020-07-24 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201710727738.1A Active CN107342178B (en) | 2017-08-23 | 2017-08-23 | High-breaking miniature circuit breaker |
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Families Citing this family (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109087832B (en) * | 2018-10-08 | 2023-11-14 | 嘉兴市加控电气设备制造有限公司 | Small-sized circuit breaker |
| CN109494132B (en) * | 2018-12-31 | 2024-04-02 | 盛道（中国）电气有限公司 | Double-contact molded case circuit breaker |
| CN110581045A (en) * | 2019-09-12 | 2019-12-17 | 南京日新科技有限公司 | Isolated contact mechanism for circuit breaker |
| CN113506712A (en) * | 2021-06-29 | 2021-10-15 | 浙江百事宝电器股份有限公司 | Quick action mechanism of hydraulic electromagnetic type circuit breaker and circuit breaker with quick action mechanism |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427006A (en) * | 2011-11-08 | 2012-04-25 | 江苏辉能电气有限公司 | Contact structure for low-current molded case low-voltage circuit breaker |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1209776C (en) * | 2003-03-12 | 2005-07-06 | 北京人民电器厂 | Circuit breaker forced extinguisher |
| JP2005129436A (en) * | 2003-10-27 | 2005-05-19 | Matsushita Electric Works Ltd | Circuit breaker |
| JP5758169B2 (en) * | 2011-03-31 | 2015-08-05 | Ｎｋｋスイッチズ株式会社 | Small switch for DC current interruption with arc extinguishing device |
| CN103646804B (en) * | 2013-11-30 | 2015-12-09 | 德力西电气有限公司 | The forced extinguisher of circuit breaker |
| CN204270934U (en) * | 2014-12-05 | 2015-04-15 | 平顶山天晟电气有限公司 | A kind of low-voltage circuit breaker with arc extinguishing slide block |
| CN207367828U (en) * | 2017-08-23 | 2018-05-15 | 河北宝凯电气股份有限公司 | A kind of high-breaking miniature breaker |
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2017
- 2017-08-23 CN CN201710727738.1A patent/CN107342178B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102427006A (en) * | 2011-11-08 | 2012-04-25 | 江苏辉能电气有限公司 | Contact structure for low-current molded case low-voltage circuit breaker |
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| CN107342178A (en) | 2017-11-10 |
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