CN109494132B - Double-contact molded case circuit breaker - Google Patents
Double-contact molded case circuit breaker Download PDFInfo
- Publication number
- CN109494132B CN109494132B CN201811651526.0A CN201811651526A CN109494132B CN 109494132 B CN109494132 B CN 109494132B CN 201811651526 A CN201811651526 A CN 201811651526A CN 109494132 B CN109494132 B CN 109494132B
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- contact
- moving contact
- spring
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- moving
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- 238000005516 engineering process Methods 0.000 claims abstract description 14
- 238000010891 electric arc Methods 0.000 claims abstract description 10
- 230000000630 rising effect Effects 0.000 claims abstract description 4
- 238000009423 ventilation Methods 0.000 claims description 6
- 230000009977 dual effect Effects 0.000 claims 2
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 230000008033 biological extinction Effects 0.000 description 4
- 230000003068 static effect Effects 0.000 description 4
- 230000000670 limiting effect Effects 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000009413 insulation Methods 0.000 description 2
- 230000016507 interphase Effects 0.000 description 2
- 230000005389 magnetism Effects 0.000 description 2
- 239000002184 metal Substances 0.000 description 2
- 229910052751 metal Inorganic materials 0.000 description 2
- 230000002829 reductive effect Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 239000004033 plastic Substances 0.000 description 1
- 239000010970 precious metal Substances 0.000 description 1
- 239000012815 thermoplastic material Substances 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
- H01H73/04—Contacts
Abstract
The invention relates to a double-contact molded case circuit breaker, which comprises a movable contact pivotally mounted to a contact support and capable of rotating anticlockwise or clockwise relative to the contact support, and is characterized in that: the invention has the advantages that compared with the prior art, the unique U-shaped fixed contact can realize the pre-breaking technology, wherein the pre-breaking technology refers to that when short-circuit current flows through a contact system, the U-shaped fixed contact and the movable contact generate electric force which is mutually exclusive; the larger the short-circuit current is, the larger the repulsive electromotive force is, and the repulsive electromotive force and the short-circuit current are generated simultaneously; before the tripping action occurs, the electric repulsive force can separate the moving contact from the fixed contact, and the purpose of inhibiting the short-circuit current from rising is achieved by lengthening the electric arc to increase the equivalent resistance between the moving contact and the fixed contact.
Description
Technical Field
The invention relates to a circuit breaker, in particular to a double-contact molded case circuit breaker.
Background
The existing circuit breaker belongs to a switching device capable of closing, carrying and opening current under normal loop conditions and capable of closing, carrying and opening current under abnormal loop conditions (including short circuit conditions) within a specified time. Generally, the components of the existing circuit breaker include a trip, a latch, an upper link, a lower link, a moving contact bracket, a moving contact and two fixed contacts, wherein the moving contact includes two moving contact contacts, and each fixed contact is provided with a fixed contact.
The contact arc extinguishing system mainly comprises a moving contact and an arc extinguishing chamber, wherein the moving contact and the arc extinguishing chamber are arranged in a base in the prior generation of products, and as the moving contact is arranged in a three-phase integrated rotating shaft, the interphase insulation is not very good, and the electric arc is easy to be mixed, so that interphase short circuit is caused; in addition, the contact arc extinguishing system bears the important task of breaking various fault currents, and the current limiting new technology is necessary to improve the short circuit breaking capacity; finally, the continuous improvement of the power grid capacity has higher and higher requirements on the breaking capacity of the low-voltage circuit breaker, the breaking capacity and the volume become the subjects of various circuit breaker manufacturers, and on the premise of improving the breaking capacity, the volume of the product is reduced as much as possible, a large amount of space can be saved for equipment such as a switch cabinet and the like, and precious metals can be saved.
Disclosure of Invention
The first technical problem to be solved by the invention is to provide a double-contact molded case circuit breaker capable of improving the short-circuit breaking capacity aiming at the current state of the art.
The second technical problem to be solved by the invention is to provide a double-contact molded case circuit breaker capable of avoiding electric arc from being mixed among three phases aiming at the prior art.
The third technical problem to be solved by the invention is to provide a double-contact molded case circuit breaker capable of effectively solving the temperature rise problem aiming at the current state of the art.
The technical scheme adopted for solving the technical problems is as follows: the double-contact molded case circuit breaker comprises a shell, a moving contact, a fixed contact and a contact support, wherein the moving contact can rotate anticlockwise or clockwise relative to the contact support, and is characterized in that: the two ends of the moving contact are respectively provided with a first moving contact and a second moving contact with a second moving contact, the fixed contacts are arranged on the shell and are U-shaped, the two fixed contacts also comprise a first fixed contact and a second fixed contact, the end parts of the first fixed contact and the second fixed contact are respectively provided with a first fixed contact and a second fixed contact, and the first moving contact of the first moving contact and the second moving contact of the second moving contact can be contacted with and separated from the first fixed contact of the first fixed contact and the second moving contact of the second moving contact, so that the switching-on and switching-off of current are realized.
Further, the contact support comprises a support body, a first through hole and a second through hole which are formed in the support body and used for enabling a movable contact arm with a first movable contact and a second movable contact to extend out, and a contact spring connected to the movable contact arm, wherein the contact spring enables the first movable contact of the movable contact arm to always have a trend of being in contact with a first fixed contact of the first fixed contact and the second movable contact of the second fixed contact.
Further, a first concave-convex structure and a second concave-convex structure are locally arranged on two sides of the movable contact arm respectively, a first positioning column and a second positioning column are arranged on the shell corresponding to the concave-convex structures on two sides of the movable contact arm, the contact springs comprise a first contact spring and a second contact spring, the first contact spring comprises a first sub-contact spring and a second sub-contact spring which are connected, a first connecting part between the first sub-contact spring and the second sub-contact spring is connected with the first concave-convex structure, end parts of the first sub-contact spring and the second sub-contact spring are connected with the first positioning column, correspondingly, the second contact spring comprises a third sub-contact spring and a fourth sub-contact spring which are connected with each other, a second connecting part between the third sub-contact spring and the fourth sub-contact spring is connected with the second concave-convex structure, and end parts of the first sub-contact spring and the second sub-contact spring are connected with the second positioning column.
Preferably, the first sub-contact spring and the second sub-contact spring and the first connecting portion together form a "U" shape, and the third sub-contact spring and the fourth sub-contact spring and the second connecting portion also together form a "U" shape.
In order to improve the arc extinguishing effect, a first arc extinguishing chamber and a second arc extinguishing chamber are arranged at positions, corresponding to the first moving contact and the second moving contact, on the shell. The first arc-extinguishing chamber and the second arc-extinguishing chamber both adopt a novel technology of combining a metal grid sheet short arc with an automatic gas-blowing arc-extinguishing, so that the arc voltage is increased rapidly and maintained at a higher level; meanwhile, a magnetism increasing structure can be adopted, so that an electric arc enters the first arc extinguishing chamber and the second arc extinguishing chamber as soon as possible, and the arc extinguishing performance is accelerated.
In order to prevent the temperature in the shell from being too high during arc extinction, the position of the shell corresponding to the first arc extinction chamber is provided with at least one first ventilation hole, and the position of the shell corresponding to the second arc extinction chamber is provided with at least one second ventilation hole. The basic principle of the circuit breaker based on the double-breakpoint technology is that 2 breakpoints are generated after the whole circuit is disconnected, and 2 arc voltages are correspondingly generated. When short-circuit current comes, the electric arc burns and absorbs a large amount of energy, thereby achieving the purpose of current limiting. Compared with the traditional single-breakpoint structure, the double-breakpoint structure consumes twice the circuit energy, and the highest breaking capacity reaches 150kA by adopting the double-breakpoint technology. Because 2 break points are arranged in the shell, the contact pressure is improved by 1 time, and the corresponding operating force to the operating mechanism is also greatly improved, so that the moment arm is increased as much as possible or the transmission mode is changed when the operating mechanism is designed, and the problem of the operating force is solved. The double-break temperature rise is higher than that of the single-break type, and as one break point is added to each phase, the contact resistance is increased by 1 time, and the corresponding temperature rise is also improved.
Compared with the prior art, the invention has the advantages that the unique U-shaped static contact can realize the pre-breaking technology, wherein the pre-breaking technology means that when short-circuit current flows through a contact system, the electric forces generated on the U-shaped static contact and the moving contact are mutually exclusive; the larger the short-circuit current is, the larger the repulsive electromotive force is, and the repulsive electromotive force and the short-circuit current are generated simultaneously; before the tripping action occurs, the electric repulsive force can separate the moving contact from the fixed contact, and the purpose of inhibiting the short-circuit current from rising is achieved by lengthening the electric arc to increase the equivalent resistance between the moving contact and the fixed contact.
Drawings
Fig. 1 is a schematic diagram of the internal structure of a double-contact molded case circuit breaker according to an embodiment of the present invention;
FIG. 2 is a schematic view of the structure of FIG. 1 at an angle;
FIG. 3 is a schematic view of another angle of FIG. 1;
FIG. 4 is a schematic view of a contact holder according to an embodiment of the present invention;
FIG. 5 is a schematic view of the structure of the frame in FIG. 4;
fig. 6 is a schematic structural view of the first contact spring and the second contact spring in fig. 4 connected to the movable contact arm.
Detailed Description
The invention is described in further detail below with reference to the embodiments of the drawings.
As shown in fig. 1 to 6, is a preferred embodiment of the present invention. The double-contact molded case circuit breaker in the embodiment comprises a shell 1, a moving contact, a fixed contact and a contact support 2, wherein the moving contact can rotate anticlockwise or clockwise relative to the contact support 2, a first moving contact 32 with a first moving contact 321 and a second moving contact 33 with a second moving contact 331 are respectively arranged at two ends of the moving contact, the fixed contact is arranged on the shell 1 and is in a U shape, the two fixed contacts also comprise a first fixed contact 41 and a second fixed contact 42, the ends of the first fixed contact 41 and the second fixed contact 42 are respectively provided with a second fixed contact 411 and a second fixed contact 421, and the first moving contact 321 of the first moving contact 32 and the second moving contact 331 of the second moving contact 33 can be contacted with and separated from the second fixed contact 411 of the first fixed contact 41 and the second moving contact 331 of the second moving contact 33, so that current connection and disconnection are realized. The contact support 2 includes a support 21, a first through hole 22 and a second through hole 23 on the support 21 for extending the moving contact arm 31 with a first moving contact 32 and a second moving contact 33, and a contact spring connected to the moving contact arm 31, where the contact spring makes the first moving contact 32 of the moving contact arm 31 always have a tendency to contact with the second fixed contact 411 of the first fixed contact 41 and the second moving contact 33 always have the second fixed contact 421 of the second fixed contact 42. The unique U-shaped static contact can realize a pre-breaking technology, wherein the pre-breaking technology refers to that when short-circuit current flows through a contact system, the electric forces generated on the U-shaped static contact and the moving contact are mutually exclusive; the larger the short-circuit current is, the larger the repulsive electromotive force is, and the repulsive electromotive force and the short-circuit current are generated simultaneously; before the tripping action occurs, the electric repulsive force can separate the moving contact from the fixed contact, and the purpose of inhibiting the short-circuit current from rising is achieved by lengthening the electric arc to increase the equivalent resistance between the moving contact and the fixed contact.
In addition, the two sides of the movable contact arm 31 are respectively and partially provided with a first concave-convex structure 311 and a second concave-convex structure 312, the concave-convex structure of the two sides of the housing 1 corresponding to the movable contact arm 31 is provided with a first positioning column 5 and a second positioning column 6, the contact springs comprise a first contact spring 7 and a second contact spring 8, the first contact spring 7 comprises a first sub-contact spring 71 and a second sub-contact spring 72 which are connected, a first connecting part 73 between the first sub-contact spring 71 and the second sub-contact spring 72 is connected with the first concave-convex structure 311, the ends of the first sub-contact spring 71 and the second sub-contact spring 72 are connected with the first positioning column 5, correspondingly, the second contact spring 8 comprises a third sub-contact spring 81 and a fourth sub-contact spring 82 which are connected with each other, a second connecting part 83 between the third sub-contact spring 81 and the fourth sub-contact spring 82 is connected with the second concave-convex structure 312, and the ends of the first sub-contact spring 71 and the second sub-contact spring 72 are connected with the second positioning column 6. The first and second sub-contact springs 71, 72 together with the first connection portion 73 form a "U", and the third and fourth sub-contact springs 81, 82 and the second connection portion 83 also together form a "U".
In order to improve the arc extinguishing effect, the housing 1 is provided with a first arc extinguishing chamber 9 and a second arc extinguishing chamber 10 at positions corresponding to the first moving contact 32 and the second moving contact 33. The first arc-extinguishing chamber 9 and the second arc-extinguishing chamber 10 both adopt a novel technology of combining a metal grid sheet short arc with an automatic gas-blowing arc-extinguishing, so that the arc voltage is increased rapidly and maintained at a higher level; meanwhile, a magnetism increasing structure can be adopted, so that an electric arc enters the first arc extinguishing chamber 9 and the second arc extinguishing chamber 10 as soon as possible, and the arc extinguishing performance is accelerated. In order to prevent the temperature in the housing 1 from being too high during arc extinction, the housing 1 has at least one first ventilation hole 11 at a position corresponding to the first arc extinguishing chamber 9, and the housing 1 has at least one second ventilation hole 12 at a position corresponding to the second arc extinguishing chamber 10. Because the circuit breaker basic principle of the double-contact molded case circuit breaker based on the double-breakpoint technology as a sign is that 2 breakpoints are generated after the whole loop is disconnected, and 2 arc voltages are correspondingly generated. When short-circuit current comes, the electric arc burns and absorbs a large amount of energy, thereby achieving the purpose of current limiting. Compared with the traditional single-breakpoint structure, the double-breakpoint structure consumes twice the circuit energy, and the highest breaking capacity reaches 150kA by adopting the double-breakpoint technology. Because 2 break points are arranged in the shell 1, the contact pressure is improved by 1 time, and the corresponding operating force to the operating mechanism is also greatly improved, so that the moment arm is increased as much as possible or the transmission mode is changed when the operating mechanism is designed, and the problem of the operating force is solved. The double-breakpoint temperature rise is higher than that of a single-breakpoint type, and as one breakpoint is added to each phase, the contact resistance is increased by 1 time, and the corresponding temperature rise is also improved.
In case of an oversized short circuit, the circuit breaker also needs to perform a trip operation to break the current, and at this time, the moving contacts receive a huge electric repulsive force from the first fixed contact 41 and the second fixed contact 42, and the repulsive force separates the first moving contact 321 of the first moving contact 32 and the second moving contact 331 of the second moving contact 33 from the second fixed contact 411 of the first fixed contact 41 and the second fixed contact 421 of the second fixed contact 421, so that the break operation of the circuit breaker is realized, and the first contact spring 7 and the second contact spring 8 are rapidly compressed to rotate clockwise to separate from the first fixed contact 41 and the second fixed contact 42, thereby breaking the short circuit current. In addition, the novel closed contact arc-extinguishing system adopted by the molded case circuit breaker seals the moving contact and the arc-extinguishing chamber together by using an arc-resistant high-strength plastic material to form a closed structure, so that the gas pressure of the arc-extinguishing chamber can be increased, the short circuit breaking capacity is greatly improved, the reliability of short circuit breaking is also improved, and the contact arc-extinguishing systems of all phases are relatively independent to ensure phase insulation; the arc energy generated during breaking is mainly born by the cavity of the module, so that the strength requirement on the breaker shell is reduced, and the base can be made of thermoplastic materials.
Claims (3)
1. The utility model provides a double contact moulded case circuit breaker, is including casing (1), moving contact, stationary contact and contact support (2), the moving contact can make anticlockwise rotation or clockwise rotation relative this contact support (2), its characterized in that: the two ends of the moving contact are respectively provided with a first moving contact (32) with a first moving contact (321) and a second moving contact (33) with a second moving contact (331), the fixed contacts are arranged on the shell (1) and are U-shaped, the two fixed contacts also comprise a first fixed contact (41) and a second fixed contact (42), the end parts of the first fixed contact (41) and the second fixed contact (42) are respectively provided with a first fixed contact (411) and a second fixed contact (421), the first moving contact (321) of the first moving contact (32) and the second moving contact (331) of the second moving contact (33) can be contacted with and separated from the first moving contact (411) of the first fixed contact (41) and the second moving contact (331) of the second moving contact (33), so that the switching-on and switching-off of current are realized, the pre-breaking technology can be realized by the U-shaped fixed contact, and the electric power generated on the U-shaped fixed contact and the moving contact are mutually repulsive when short-circuit current flows through a contact system; the larger the short-circuit current is, the larger the repulsive electromotive force is, and the repulsive electromotive force and the short-circuit current are generated simultaneously; before tripping action occurs, the electric repulsive force can separate the moving contact, the equivalent resistance between the moving contact and the electric repulsive force is increased by lengthening the electric arc, so that the short-circuit current is restrained from rising, the contact support (2) comprises a support body (21), a first through hole (22) and a second through hole (23) which are used for extending a moving contact arm (31) with a first moving contact (32) and a second moving contact (33) and a contact spring connected to the moving contact arm (31) are arranged on the support body (21), the first moving contact (32) of the moving contact arm (31) always has a trend of contacting with a first fixed contact (411) of a first fixed contact (41) and the second moving contact (33) always has a trend of contacting with a second fixed contact (421) of a second fixed contact (42), a first concave-convex structure (311) and a second concave-convex structure (312) are respectively and locally arranged on two sides of the moving contact arm (31), a first positioning spring (7) and a second positioning spring (7) are arranged on two sides of the shell (1) corresponding to the moving contact arm (31), the first positioning spring (7) and the second positioning spring (7) are connected with a first positioning post (7), the first connection part (73) between the first sub-contact spring (71) and the second sub-contact spring (72) is connected to the first concave-convex structure (311), the end parts of the first sub-contact spring (71) and the second sub-contact spring (72) are connected to the first positioning column (5), correspondingly, the second contact spring (8) comprises a third sub-contact spring (81) and a fourth sub-contact spring (82) which are connected, a second connection part (83) between the third sub-contact spring (81) and the fourth sub-contact spring (82) is connected to the second concave-convex structure (312), the end parts of the first sub-contact spring (71) and the second sub-contact spring (72) are connected to the second positioning column (6), the first sub-contact spring (71) and the second sub-contact spring (72) and the first connection part (73) form a U-shape together, and the third sub-contact spring (81) and the fourth sub-contact spring (82) and the second connection part (83) form a U-shape together.
2. The dual contact molded case circuit breaker according to claim 1, wherein: a first arc-extinguishing chamber (9) and a second arc-extinguishing chamber (10) are arranged on the shell (1) at positions corresponding to the first moving contact (32) and the second moving contact (33).
3. The dual contact molded case circuit breaker according to claim 2, wherein: the shell (1) is provided with at least one first ventilation hole (11) at a position corresponding to the first arc extinguishing chamber (9), and the shell (1) is provided with at least one second ventilation hole (12) at a position corresponding to the second arc extinguishing chamber (10).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651526.0A CN109494132B (en) | 2018-12-31 | 2018-12-31 | Double-contact molded case circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201811651526.0A CN109494132B (en) | 2018-12-31 | 2018-12-31 | Double-contact molded case circuit breaker |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN109494132A CN109494132A (en) | 2019-03-19 |
| CN109494132B true CN109494132B (en) | 2024-04-02 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201811651526.0A Active CN109494132B (en) | 2018-12-31 | 2018-12-31 | Double-contact molded case circuit breaker |
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| Country | Link |
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| CN (1) | CN109494132B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2020248556A1 (en) * | 2019-06-11 | 2020-12-17 | 江苏亚开电气有限公司 | Novel double-contact point plastic case circuit breaker |
| CN111769014B (en) * | 2020-06-06 | 2022-05-13 | 武汉船用电力推进装置研究所（中国船舶重工集团公司第七一二研究所） | Rotary multi-contact-finger contact structure |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000188031A (en) * | 1998-12-21 | 2000-07-04 | Terasaki Electric Co Ltd | Contact device of circuit breaker |
| KR20020068143A (en) * | 2001-02-20 | 2002-08-27 | 현대중공업 주식회사 | Twin Repulsive Moving Breaking Contact Unit Of Molded Case Circuit Breaker |
| WO2008049336A1 (en) * | 2006-10-25 | 2008-05-02 | Zhejiang Chint Electrics Co., Ltd | Circuit breaker for rapidly breaking low voltage circuit |
| CN202502961U (en) * | 2012-01-18 | 2012-10-24 | 陈洪元 | Current-limiting liquid magnetic type miniature circuit breaker |
| CN107342178A (en) * | 2017-08-23 | 2017-11-10 | 河北宝凯电气股份有限公司 | A kind of high-breaking miniature breaker |
-
2018
- 2018-12-31 CN CN201811651526.0A patent/CN109494132B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000188031A (en) * | 1998-12-21 | 2000-07-04 | Terasaki Electric Co Ltd | Contact device of circuit breaker |
| KR20020068143A (en) * | 2001-02-20 | 2002-08-27 | 현대중공업 주식회사 | Twin Repulsive Moving Breaking Contact Unit Of Molded Case Circuit Breaker |
| WO2008049336A1 (en) * | 2006-10-25 | 2008-05-02 | Zhejiang Chint Electrics Co., Ltd | Circuit breaker for rapidly breaking low voltage circuit |
| CN202502961U (en) * | 2012-01-18 | 2012-10-24 | 陈洪元 | Current-limiting liquid magnetic type miniature circuit breaker |
| CN107342178A (en) * | 2017-08-23 | 2017-11-10 | 河北宝凯电气股份有限公司 | A kind of high-breaking miniature breaker |
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| Publication number | Publication date |
|---|---|
| CN109494132A (en) | 2019-03-19 |
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