CN110034000B - Arc striking static contact and molded case circuit breaker thereof - Google Patents
Arc striking static contact and molded case circuit breaker thereof Download PDFInfo
- Publication number
- CN110034000B CN110034000B CN201910379033.4A CN201910379033A CN110034000B CN 110034000 B CN110034000 B CN 110034000B CN 201910379033 A CN201910379033 A CN 201910379033A CN 110034000 B CN110034000 B CN 110034000B
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- platform
- connecting part
- arc
- arc striking
- contact
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- 230000003068 static effect Effects 0.000 title claims abstract description 29
- 230000000149 penetrating effect Effects 0.000 claims description 3
- 238000002679 ablation Methods 0.000 abstract description 4
- 238000009792 diffusion process Methods 0.000 abstract description 3
- 238000010891 electric arc Methods 0.000 description 9
- 230000009286 beneficial effect Effects 0.000 description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000006185 dispersion Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 241000288675 Pteropodidae Species 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000009471 action Effects 0.000 description 1
- 238000005452 bending Methods 0.000 description 1
- 238000007664 blowing Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000004880 explosion Methods 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 239000000463 material Substances 0.000 description 1
- 230000007246 mechanism Effects 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 230000002035 prolonged effect Effects 0.000 description 1
Classifications
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- 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
-
- 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 invention discloses an arc striking static contact, which comprises: the fixed contact support comprises a first platform, a first connecting part, a second platform, a second connecting part and a third platform; the first platform is connected with the second platform through the first connecting part, the downward angle of the opening formed by the first platform and the first connecting part is an obtuse angle, and the upward angle of the opening formed by the first connecting part and the second platform is an obtuse angle; the second platform is also connected with the third platform through the second connecting part, and the third platform is positioned above the second platform; the contact is positioned on the third platform; the arc striking rod is positioned between the first connecting part and the second platform. According to the invention, by arranging the arc striking rod, the diffusion of arc energy can be effectively inhibited, so that the ablation of a static contact is reduced, and the breaking capacity of the circuit breaker is improved.
Description
Technical Field
The invention relates to the field of circuit breakers, in particular to an arc striking static contact and a molded case circuit breaker thereof.
Background
Along with the improvement of the living standard of people, social production and people's life are increasingly separated from the use of electricity, and the requirements on the reliability of power supply are higher and higher just because of the high importance of the electric energy at present, the protection functions of various high-voltage and low-voltage electric appliances are promoted to be more perfect, and the plastic-case circuit breaker is used as a member in the low-voltage electric appliances and is rapidly developed.
The molded case circuit breaker is a switching device capable of closing, carrying and breaking a current under normal circuit conditions and carrying and breaking a current under abnormal conditions for a prescribed time. The circuit breaker can be used for distributing electric energy, starting an asynchronous motor infrequently, protecting a power line, a motor and the like, automatically cutting off a circuit when faults such as serious overload, short circuit, undervoltage and the like occur, the function of the circuit breaker is equivalent to the combination of a fuse type switch, an overheat relay and the like, a static contact is an important part of the circuit breaker, the contact is used as a core part in low-voltage switching equipment and plays the roles of opening and conducting, the performance of the circuit breaker directly influences the quality and the service life of the circuit breaker, high-temperature and high-heat electric arcs are generated between a moving contact and the static contact in the process of switching on or switching off the circuit, if the electric arcs cannot be conducted and extinguished rapidly, contacts between the two contacts are ablated, and the shell of the circuit breaker is greatly damaged, in the existing circuit breaker, but part of the electric arc energy generated by switching on and off of the moving contact is introduced into an explosion chamber, the residual electric arc energy causes the static contact and other mechanisms to ablate, the breaking capacity of the circuit breaker is reduced, and the service life of the circuit breaker is reduced.
Disclosure of Invention
The invention aims to provide an arc striking static contact and a molded case circuit breaker thereof, which enable arc energy generated by the molded case circuit breaker at the moment of switching on or switching off to fully enter an arc extinguishing chamber, and improve the breaking capacity of the molded case circuit breaker.
In order to achieve the above object, the present invention provides the following solutions:
An arcing stationary contact, the stationary contact comprising:
a fixed contact support, a contact and an arc striking rod;
The static contact support comprises a first platform, a first connecting part, a second platform, a second connecting part and a third platform; the first platform is connected with the second platform through the first connecting part, an opening downward angle formed by the first platform and the first connecting part is an obtuse angle, and an opening upward angle formed by the first connecting part and the second platform is an obtuse angle; the second platform is also connected with the third platform through the second connecting part, and the third platform is positioned above the second platform;
the contact is positioned on the third platform;
The arc striking rod is positioned between the first connecting part and the second platform.
Optionally, the stationary contact further includes: a boss and a shroud;
the boss is positioned between the first connecting part and the second platform, and the arc striking rod is positioned on the boss;
The shield is located outside the second connecting portion and clamped on the boss.
Optionally, the stationary contact further includes: and the arc extinguishing chamber is positioned above the third platform.
Optionally, the stationary contact further includes: an inner hexagon screw; the first platform is provided with a threaded hole, and the socket head cap screw is used for penetrating through the threaded hole to be connected with an external power line.
Optionally, the first platform is provided with a mounting hole, and the second platform is provided with a fixing hole.
The invention further provides a molded case circuit breaker, and the fixed contact of the molded case circuit breaker.
According to the specific embodiment provided by the invention, the invention discloses the following technical effects:
The static contact of the invention is arranged in the arc extinguishing chamber by arranging the arc striking rod, namely the bent striking rod, and the static contact with the bent striking rod is arranged in the arc extinguishing chamber. Therefore, the curved arc striking rod can effectively control the diffusion of arc energy, so that the arcing distance is controlled in the minimum range, the arc extinguishing chamber is promoted to sufficiently extinguish the arc energy, and the dispersion of the arc energy is reduced, so that the ablation of a fixed contact is reduced, the improvement of the arc extinguishing capacity and breaking capacity of the molded case circuit breaker is facilitated, the service life of a product is prolonged, and the quality of the product is improved.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions of the prior art, the drawings that are needed in the embodiments will be briefly described below, it being obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic diagram of an overall structure of a static contact arc striking structure, a shield and an arc extinguishing chamber assembly according to an embodiment of the invention;
fig. 2 is a right side view of an assembled whole structure of a static contact arc striking structure, a shield and an arc extinguishing chamber according to the embodiment of the invention;
fig. 3 is a schematic diagram of an arc striking structure of a static contact according to an embodiment of the invention.
Symbol description
The arc starting device comprises a first platform 101, a first connecting part 102, a second platform 103, a second connecting part 104, a third platform 105, a mounting hole 106, a fixing hole 107, a contact 2, an arc starting rod 3, a boss 4, a shield 5, an arc extinguishing chamber 6 and an inner hexagon screw 7.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
The invention aims to provide an arc striking static contact and a molded case circuit breaker thereof, which enable arc energy generated by the molded case circuit breaker at the moment of switching on or switching off to fully enter an arc extinguishing chamber, and improve the breaking capacity of the molded case circuit breaker.
In order that the above-recited objects, features and advantages of the present invention will become more readily apparent, a more particular description of the invention will be rendered by reference to the appended drawings and appended detailed description.
Fig. 1 is a schematic view of an overall structure of an arc striking structure, a shield and an arc extinguishing chamber of a static contact according to an embodiment of the present invention, fig. 2 is a right side view of an overall structure of an arc striking structure, a shield and an arc extinguishing chamber of an embodiment of the present invention, and fig. 3 is a schematic view of an arc striking structure of a static contact according to an embodiment of the present invention, as shown in fig. 1 to 3, the static contact includes:
the fixed contact bracket, the contact 2, the arc striking rod 3, the boss 4, the shield 5, the arc extinguishing chamber 6 and the socket head cap screw 7;
the static contact support comprises a first platform 101, a first connecting part 102, a second platform 103, a second connecting part 104 and a third platform 105; the first platform 101 is connected with the second platform 103 through the first connecting part 102, an opening downward angle formed by the first platform 101 and the first connecting part 102 is an obtuse angle, and an opening upward angle formed by the first connecting part 102 and the second platform 103 is an obtuse angle; the second platform 103 is further connected to the third platform 105 through the second connection portion 104, and the third platform 105 is located above the second platform 103;
The contact 2 is located on the third platform 105;
the boss 4 is located between the first connecting part 102 and the second platform 103, and the arc striking rod 3 is located on the boss 4;
the shield 5 is located outside the second connection part and is clamped on the boss 4, and the erosion of the static contact is serious when arc energy generated in the moment of contact between the static contact and the static contact can be reduced by arranging the shield 5.
The arc extinguishing chamber 6 is located above the third platform.
The first platform 101 is provided with a threaded hole, and the socket head cap screw 7 is used for penetrating through the threaded hole to be connected with an external power line.
The first platform 101 is provided with a mounting hole 106, and the second platform 103 is provided with a fixing hole 107 for mounting and fixing the static contact.
The fixed contact is used for being in contact with the moving contact, so that the molded case circuit breaker is conducted, the arc striking rod 3 cannot be a straight arc striking rod, and the arc energy generated in the moment of breaking the moving contact is relatively large, so that the contact area of the curved arc striking rod and the arc energy is smaller than that of the straight arc striking rod, and the ablation of the arc striking rod can be reduced. Because the influence of bars inside the arc extinguishing chamber is that the curved arc striking rod stretches into the middle of the bars of the arc extinguishing chamber, the size requirement of the arc striking rod can stretch into the middle of the bars of the arc extinguishing chamber, the material of the arc striking rod 3 is consistent with that of a fixed contact support, the curved head part of the arc striking rod has a certain requirement on the bending degree, and the curved head part of the arc striking rod cannot be provided with a too large gap with the lower part of the bars of the arc extinguishing chamber.
Arc energy generated by the moving and static contacts can be introduced into the arc extinguishing chamber by arranging the arc striking rod 3, and the principle is that: the bottom of the arc extinguishing chamber 6 is communicated, part of generated arc energy flows out from the bottom of the arc extinguishing chamber 6, the arc energy is sent into the arc extinguishing chamber 6 through the arc striking rod 3, electromagnetic arc blowing force formed by an induction magnetic field is generated by utilizing a grid sheet of the arc extinguishing chamber 6, the arc energy is sucked into the arc extinguishing chamber, the arc is divided into a plurality of small sections by a metal grid sheet, and the aim of extinguishing the arc is achieved by utilizing the near-cathode effect of the arc.
The invention further provides a plastic-case circuit breaker which comprises the fixed contact.
The static contact has the following beneficial effects:
Because the moving and static contacts are in contact with each other and are separated from each other, the gap between the two contacts is changed from small to large, under the action of high voltage, an insulating medium in the gap is ionized and broken down to form an electric arc, after the electric arc is formed, generated heat can further intensify ionization of the medium, the electric arc is expanded, the electric arc can not break a circuit of the circuit breaker, the fixed contact with the curved arc striking rod is arranged in an arc extinguishing chamber through arranging the arc striking rod with the curved arc striking rod on a boss of the body of the fixed contact, a plurality of channels are arranged in the arc extinguishing chamber, the electric arc is divided, and the electric arc energy generated by the moving and static contacts at the moment of breaking is introduced into the arc extinguishing chamber through the arc striking rod with the curved arc striking rod, so that the electric arc is blown out through a certain channel nozzle of the arc extinguishing chamber. The curved striking rod can effectively control the diffusion of arc energy, so that the distance between flying foxes is controlled in the minimum range, the arc extinguishing chamber is promoted to sufficiently extinguish the arc energy, and the dispersion of the arc energy is reduced, thereby reducing the ablation of a fixed contact, being beneficial to improving the breaking capacity and the arc extinguishing capacity of the molded case circuit breaker, prolonging the service life of the product and improving the quality of the product.
In the present specification, each embodiment is described in a progressive manner, and each embodiment is mainly described in a different point from other embodiments, and identical and similar parts between the embodiments are all enough to refer to each other.
The principles and embodiments of the present invention have been described herein with reference to specific examples, the description of which is intended only to assist in understanding the methods of the present invention and the core ideas thereof; also, it is within the scope of the present invention to be modified by those of ordinary skill in the art in light of the present teachings. In view of the foregoing, this description should not be construed as limiting the invention.
Claims (4)
1. An arcing stationary contact, characterized in that the stationary contact comprises:
a fixed contact support, a contact and an arc striking rod;
The static contact support comprises a first platform, a first connecting part, a second platform, a second connecting part and a third platform; the first platform is connected with the second platform through the first connecting part, an opening downward angle formed by the first platform and the first connecting part is an obtuse angle, and an opening upward angle formed by the first connecting part and the second platform is an obtuse angle; the second platform is also connected with the third platform through the second connecting part, and the third platform is positioned above the second platform;
the contact is positioned on the third platform;
The arc striking rod is positioned between the first connecting part and the second platform;
The stationary contact further comprises: a boss and a shroud;
the boss is positioned between the first connecting part and the second platform, and the arc striking rod is positioned on the boss;
the shield is positioned at the outer side of the second connecting part and is clamped on the boss;
the stationary contact further comprises: the arc extinguishing chamber is positioned above the third platform;
the arc striking rod extends into the middle of the grid sheet of the arc extinguishing chamber;
and a gap is formed between the bent head of the arc striking rod and the lower part of the arc extinguishing chamber grid sheet.
2. The arcing stationary contact of claim 1, wherein the stationary contact further comprises: an inner hexagon screw; the first platform is provided with a threaded hole, and the socket head cap screw is used for penetrating through the threaded hole to be connected with an external power line.
3. The arcing stationary contact of claim 1, wherein the first platform is provided with a mounting hole and the second platform is provided with a fixing hole.
4. A molded case circuit breaker comprising the stationary contact of any one of claims 1-3.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910379033.4A CN110034000B (en) | 2019-05-08 | 2019-05-08 | Arc striking static contact and molded case circuit breaker thereof |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910379033.4A CN110034000B (en) | 2019-05-08 | 2019-05-08 | Arc striking static contact and molded case circuit breaker thereof |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110034000A CN110034000A (en) | 2019-07-19 |
| CN110034000B true CN110034000B (en) | 2024-08-06 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910379033.4A Active CN110034000B (en) | 2019-05-08 | 2019-05-08 | Arc striking static contact and molded case circuit breaker thereof |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110034000B (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208336078U (en) * | 2018-07-18 | 2019-01-04 | 环宇集团浙江高科股份有限公司 | A kind of breaker of plastic casing static contact arc eliminating module |
Family Cites Families (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102005345B (en) * | 2010-11-11 | 2012-11-21 | 江苏辉能电气有限公司 | Arc extinguishing module of molded case low-voltage circuit breaker |
| CN102044388B (en) * | 2011-01-14 | 2013-02-27 | 江苏辉能电气有限公司 | Static contact structure of moulded case circuit breaker |
| CN202205675U (en) * | 2011-09-23 | 2012-04-25 | 德力西电气（宁波）有限公司 | Dual flicking type moulded case circuit breaker |
| CN205621690U (en) * | 2016-03-30 | 2016-10-05 | 浙江正泰电器股份有限公司 | Miniature circuit breaker |
| CN106876225B (en) * | 2017-04-20 | 2019-11-22 | 德力西电气有限公司 | A kind of breaker of plastic casing arc-control device and the breaker of plastic casing containing the device |
| CN107452572B (en) * | 2017-08-15 | 2019-12-17 | 国网江苏省电力公司南京供电公司 | Arc extinguishing device of circuit breaker |
-
2019
- 2019-05-08 CN CN201910379033.4A patent/CN110034000B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN208336078U (en) * | 2018-07-18 | 2019-01-04 | 环宇集团浙江高科股份有限公司 | A kind of breaker of plastic casing static contact arc eliminating module |
Non-Patent Citations (1)
| Title |
|---|
| 利用开断模型分析引弧板对低压断路器电弧运动的影响;季良 等;西安交通大学学报;第50卷(第10期);第28-35页 * |
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| Publication number | Publication date |
|---|---|
| CN110034000A (en) | 2019-07-19 |
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