CN110853999A - Circuit breaker - Google Patents
Circuit breaker Download PDFInfo
- Publication number
- CN110853999A CN110853999A CN201911093943.2A CN201911093943A CN110853999A CN 110853999 A CN110853999 A CN 110853999A CN 201911093943 A CN201911093943 A CN 201911093943A CN 110853999 A CN110853999 A CN 110853999A
- Authority
- CN
- China
- Prior art keywords
- contact
- circuit breaker
- permanent magnet
- magnetic pole
- arc
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Pending
Links
- 230000003068 static effect Effects 0.000 claims abstract description 15
- -1 polyoxymethylene Polymers 0.000 claims description 10
- 239000011810 insulating material Substances 0.000 claims description 8
- 239000000463 material Substances 0.000 claims description 7
- 229930040373 Paraformaldehyde Natural products 0.000 claims description 5
- 239000004952 Polyamide Substances 0.000 claims description 5
- 239000000835 fiber Substances 0.000 claims description 5
- 229920002647 polyamide Polymers 0.000 claims description 5
- 229920006324 polyoxymethylene Polymers 0.000 claims description 5
- 229920001343 polytetrafluoroethylene Polymers 0.000 claims description 5
- 239000004810 polytetrafluoroethylene Substances 0.000 claims description 5
- 229910045601 alloy Inorganic materials 0.000 claims description 3
- 239000000956 alloy Substances 0.000 claims description 3
- 229910000859 α-Fe Inorganic materials 0.000 claims description 3
- 238000010891 electric arc Methods 0.000 abstract description 11
- 230000009471 action Effects 0.000 abstract description 5
- 239000011248 coating agent Substances 0.000 abstract description 4
- 238000000576 coating method Methods 0.000 abstract description 4
- 230000007547 defect Effects 0.000 abstract description 4
- 238000000926 separation method Methods 0.000 description 6
- 238000009413 insulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 2
- 238000012986 modification Methods 0.000 description 2
- QJVKUMXDEUEQLH-UHFFFAOYSA-N [B].[Fe].[Nd] Chemical compound [B].[Fe].[Nd] QJVKUMXDEUEQLH-UHFFFAOYSA-N 0.000 description 1
- 230000002159 abnormal effect Effects 0.000 description 1
- 229910000828 alnico Inorganic materials 0.000 description 1
- 230000008033 biological extinction Effects 0.000 description 1
- KPLQYGBQNPPQGA-UHFFFAOYSA-N cobalt samarium Chemical compound [Co].[Sm] KPLQYGBQNPPQGA-UHFFFAOYSA-N 0.000 description 1
- 238000002485 combustion reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 230000005347 demagnetization Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000005389 magnetism Effects 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 229910001172 neodymium magnet Inorganic materials 0.000 description 1
- 230000008569 process Effects 0.000 description 1
- 229910000938 samarium–cobalt magnet Inorganic materials 0.000 description 1
Images
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)
- Breakers (AREA)
Abstract
The invention relates to a circuit breaker which comprises a static contact, a moving contact, a plurality of arc extinguishing grid pieces, at least one gas generating structure and a permanent magnet. The moving contact can rotate relative to the static contact, so that the contact point of the moving contact is in contact with and/or separated from the contact point of the static contact. The arc extinguishing grid piece is used for extinguishing electric arcs generated by the fixed contact and the movable contact in a separated mode; the gas generating structure coats the arc extinguishing grid plate. The permanent magnet is provided with a first magnetic pole and a second magnetic pole, and the included angle between the connecting line direction of the first magnetic pole and the second magnetic pole and the cambered surface formed by the rotation of the movable contact is 80-100 degrees. According to the invention, the permanent magnet is arranged in the circuit breaker, so that the magnetic field of the loop can be enhanced, the defect of insufficient magnetic field intensity of the loop under the condition of low current is overcome, and the breaking capacity of the circuit breaker is improved. And moreover, the gas generation structure coating the arc extinguishing grid plate generates gas with high heat conductivity under the action of high temperature of the electric arc, so that the electric arc is rapidly cooled, the electric arc extinguishing is further accelerated, and the breaking capacity of the circuit breaker is improved.
Description
Technical Field
The invention relates to the technical field of low-voltage electric appliances, in particular to a circuit breaker.
Background
A circuit breaker is the most important protection and control equipment in a power system, and is a switching device capable of carrying and breaking a current under a normal circuit condition, and also capable of carrying and breaking a current under an abnormal circuit condition within a prescribed time. With the development of new energy technology, the rated working voltage of the direct current breaker is higher and higher, and reaches 1500V at present. Along with the improvement of working voltage, the market puts higher requirements on the reliable breaking performance of the circuit breaker, and the critical breaking difficulty is greatly increased. When the small current is cut off, the magnetic field force generated by the loop is very weak, and the arc is difficult to drive to leave the contact and stretch, so that the arc burns on the contact for a long time, the small current is failed to be cut off by the breaker, and the service life of the breaker is shortened.
Disclosure of Invention
Therefore, it is necessary to provide a circuit breaker to improve the breaking capability of the circuit breaker and avoid the problem of breaking the small current.
An embodiment of the present invention provides a circuit breaker, including:
static contact;
the moving contact can rotate relative to the static contact so as to enable the contact point of the moving contact to be in contact with and/or separated from the contact point of the static contact;
the arc extinguishing grid pieces are used for extinguishing electric arcs generated by the fixed contact and the movable contact in a separated mode;
the gas generating structure coats the arc extinguishing grid plate; and
a permanent magnet having a first magnetic pole and a second magnetic pole, wherein an included angle between a connecting direction of the first magnetic pole and the second magnetic pole and an arc surface formed by the rotation of the movable contact is 80-100 DEG
In one embodiment, the gas generating structures correspond to the arc extinguishing grid pieces one to one.
In one embodiment, the circuit breaker comprises a plurality of arc extinguishing grids, the arc extinguishing grids are divided into two parts, and the two parts of the arc extinguishing grids are respectively positioned at two opposite sides of the permanent magnet.
In one embodiment, a connection line between the first magnetic pole and the second magnetic pole is perpendicular to a plane formed by the rotation of the movable contact.
In one embodiment, the circuit breaker further comprises an insulating cover, and the insulating cover covers the permanent magnet.
In one embodiment, the insulating shield and the gas generating structure are made of the same gas generating insulating material.
In one embodiment, the gas-generating insulating material is polyoxymethylene abbreviation, polytetrafluoroethylene, or polyamide fiber.
In one embodiment, the circuit breaker further comprises a convex base to which the insulating cover and one end of the permanent magnet are fixed.
In one embodiment, the permanent magnet is made of an alloy permanent magnet material or a ferrite permanent magnet material.
In one embodiment, a plurality of arc extinguishing grid plates are arranged in parallel at equal intervals.
In summary, the present invention provides a circuit breaker, which includes a fixed contact, a movable contact, a plurality of arc-extinguishing bars, at least one gas-generating structure and a permanent magnet. The moving contact can rotate relative to the static contact, so that the contact point of the moving contact is in contact with and/or separated from the contact point of the static contact. The arc extinguishing grid piece is used for extinguishing electric arcs generated by the fixed contact and the movable contact in a separated mode; the gas generating structure coats the arc extinguishing grid plate. The permanent magnet is provided with a first magnetic pole and a second magnetic pole, and an included angle between the connecting direction of the first magnetic pole and the second magnetic pole and an arc surface formed by the rotation of the movable contact is 80-100 degrees. According to the invention, the permanent magnet is arranged in the circuit breaker, so that the magnetic field of the loop can be enhanced, the defect of insufficient magnetic field intensity of the loop under the condition of low current is overcome, and the breaking capacity of the circuit breaker is improved. And the gas generating structure coating the arc extinguishing grid piece generates gas with high heat conductivity under the action of high temperature of the electric arc, so that the electric arc is rapidly cooled, the electric arc extinguishing is further accelerated, and the breaking capacity of the circuit breaker is improved.
Drawings
Fig. 1 is a schematic structural diagram of a circuit breaker according to an embodiment of the present invention;
fig. 2 is a schematic arrangement diagram of arc chute plates on two sides of a permanent magnet according to an embodiment of the present invention;
FIG. 3 is a schematic diagram of the electromagnetic force acting on an arc with different currents flowing in different directions according to an embodiment of the present invention.
Detailed Description
In order to make the aforementioned objects, features and advantages of the present invention comprehensible, embodiments accompanied with figures are described in detail below. In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein, but rather should be construed as broadly as the present invention is capable of modification in various respects, all without departing from the spirit and scope of the present invention.
Referring to fig. 1 and 2, an embodiment of the present invention provides a circuit breaker, including: the static contact 100, the moving contact 200, a plurality of arc extinguishing bars 300, at least one gas generating structure 400 and a permanent magnet 500. The movable contact 200 can rotate relative to the stationary contact 100, so that the contact point of the movable contact 200 is in contact with and/or separated from the contact point of the stationary contact 100. The arc extinguishing grid 300 is used for extinguishing an arc generated by the separation of the fixed contact 100 and the movable contact 200. The gas generating structure 400 covers the arc chute 300. The permanent magnet 500 has a first magnetic pole and a second magnetic pole, and an included angle between a connecting direction of the first magnetic pole and the second magnetic pole and an arc surface formed by the rotation of the movable contact 200 is 80-100 degrees.
In the invention, the permanent magnet 500 is arranged in the circuit breaker, so that the magnetic field of a loop can be enhanced, the defect of insufficient magnetic field intensity of the loop under the condition of low current is overcome, the electric arc can move into the arc extinguishing grid 300 more quickly, and the breaking capacity of the circuit breaker is improved. And, the gas generating structure 400 coating the arc extinguishing grid 300 generates gas with high heat conductivity under the action of high temperature of the electric arc, so that the electric arc is rapidly cooled, the arc extinguishing is further accelerated, and the breaking capacity of the circuit breaker is improved.
In addition, an included angle between a connection direction of the first magnetic pole and the second magnetic pole of the permanent magnet 500 and an arc surface formed by the rotation of the movable contact 200 is 80-100 degrees, so that the influence of avoiding polarity can be eliminated, and different currents enter arc extinguishing grid pieces 300 on different sides of the permanent magnet 500 when alternating current is switched on and off. It should be noted that, the invention does not limit the magnetism of the first magnetic pole and the second magnetic pole at all, for example, when the first magnetic pole is an N-pole, the opposite second magnetic pole may be an S-pole. When the first magnetic pole is an S pole, the opposite second magnetic pole can be an N pole.
In one embodiment, the gas generating structures 400 correspond to the arc chute plates 300 one to one. It can be understood that the gas generation structures 400 correspond to the arc extinguishing grids 300 one to one, so that the gas generated by the gas generation structures 400 after being heated can be used for cooling the arc for multiple times in the arc extinguishing process, thereby accelerating the arc extinguishing.
In one embodiment, the arc chute plates 300 are divided into two parts, and the two parts of the arc chute plates 300 are respectively located at two opposite sides of the permanent magnet 500. It can be understood that when the ac current is cut off, different currents enter the arc chute 300 at different sides under the magnetic field of the permanent magnet 500, thereby performing arc extinction. In this embodiment, the two arc extinguishing grid pieces are the same in number, and the arc extinguishing grid pieces located on the same side are arranged in parallel at equal intervals.
In one embodiment, a connection line between the first magnetic pole and the second magnetic pole is perpendicular to a plane formed by the rotation of the movable contact 200. It can be understood that when the connection line of the first magnetic pole and the second magnetic pole is perpendicular to the plane formed by the rotation of the movable contact 200, the current is only acted by the magnetic field pointing from the N pole to the S pole (or the S pole to the N pole), the magnetic fields on both sides of the permanent magnet 500 are uniform, and the acting force directions of the currents in different directions are the same.
Referring to fig. 3, in the present embodiment, one end close to the moving contact 200 and/or the stationary contact 100 is an N pole of the permanent magnet 500, and the other end is an S pole of the permanent magnet 500, and the permanent magnet 500 generates a magnetic field pointing from the N pole to the S pole. The current interrupter is used for cutting off alternating current, when current generated by separation of the moving contact 200 and the fixed contact 100 flows to the vertical straight surface, an arc moves to the arc extinguishing grid piece 300 from a magnetic field area on the upper side of the permanent magnet 500; when the current generated by the separation of the movable contact 200 from the stationary contact 100 flows to the vertical straight surface, the arc moves from the magnetic field area of the lower side of the permanent magnet 500 to the arc chute 300. In addition, when one end close to the moving contact 200/the static contact 100 is the S pole of the permanent magnet 500, if the current generated by the separation of the moving contact 200 and the static contact 100 flows to the vertical straight surface inward, the arc moves to the arc chute 300 from the magnetic field area at the lower side of the permanent magnet 500; if the current generated by the separation of the moving contact 200 from the stationary contact 100 flows to the vertical straight surface, the arc moves from the magnetic field region on the upper side of the permanent magnet 500 to the arc chute 300.
Referring to fig. 3, in one embodiment, the circuit breaker further includes an insulating cover 600, and the insulating cover 600 covers the permanent magnet 500.
It can be understood that, after the permanent magnet 500 is coated with the insulating cover 600, when the arc moves through the permanent magnet 500, under the high temperature action of the arc, the insulating cover 600 decomposes to generate gas with high thermal conductivity, so that the arc is cooled, and on the one hand, the gas flow field is enhanced, so that the arc moves faster to enter the arc chute 300, and the breaking capacity of the circuit breaker is further improved. In addition, the permanent magnet 500 is wrapped in the insulation cover 600, so that high temperature generated during arc combustion can be isolated, and the demagnetization of the permanent magnet 500 due to the fact that the temperature exceeds the Curie temperature can be avoided.
In one embodiment, the insulating cap 600 and the gas generating structure 400 are made of the same gas generating insulating material. It will be appreciated that the use of the same gas generating insulating material to fabricate the insulating shroud 600 and the gas generating structure 400 facilitates reduced manufacturing costs and material management complexity. In addition, the insulating cover 600 and the gas generation structure 400 can be made of different gas generation insulating materials, and can be designed according to actual needs.
In one embodiment, the gas-generating insulating material is polyoxymethylene abbreviation, polytetrafluoroethylene, or polyamide fiber. The insulation cover 600 may be made of polyoxymethylene abbreviation, polytetrafluoroethylene or polyamide fiber, and the gas generating structure 400 may be made of any one of polyoxymethylene abbreviation, polytetrafluoroethylene and polyamide fiber.
In one embodiment, the circuit breaker further includes a convex base 700 to which one ends of the permanent magnet 500 and the insulation cover 600 are fixed. In this embodiment, the permanent magnet 500 is fixed to the center of the convex base 700, and the insulation cover 600 is attached to the convex portion of the convex base 700 to form a sealed accommodating cavity for accommodating the permanent magnet 500 with the convex base 700.
In one embodiment, the permanent magnet 500 is made of an alloy permanent magnet material or a ferrite permanent magnet material. For example, it may be selected from any of neodymium iron boron, samarium cobalt, or alnico.
In summary, the present invention provides a circuit breaker, which includes a fixed contact 100, a movable contact 200, a plurality of arc-extinguishing bars 300, at least one gas-generating structure 400, and a permanent magnet 500. The movable contact 200 can rotate relative to the stationary contact 100, so that the contact point of the movable contact 200 is in contact with and/or separated from the contact point of the stationary contact 100. The arc extinguishing grid 300 is used for extinguishing electric arcs generated by the separation of the static contact 100 and the moving contact 200; the gas generating structure 400 covers the arc chute 300. The permanent magnet 500 has a first magnetic pole and a second magnetic pole, and an included angle between a connecting direction of the first magnetic pole and the second magnetic pole and an arc surface formed by the rotation of the movable contact 200 is 80-100 degrees. In the invention, the permanent magnet 500 is arranged in the circuit breaker, so that the magnetic field of the loop can be enhanced, the defect of insufficient magnetic field intensity of the loop under the condition of low current is overcome, and the breaking capacity of the circuit breaker is improved. And, the gas generating structure 400 coating the arc extinguishing grid 300 generates gas with high heat conductivity under the action of high temperature of the electric arc, so that the electric arc is rapidly cooled, the arc extinguishing is further accelerated, and the breaking capacity of the circuit breaker is improved.
The technical features of the embodiments described above may be arbitrarily combined, and for the sake of brevity, all possible combinations of the technical features in the embodiments described above are not described, but should be considered as being within the scope of the present specification as long as there is no contradiction between the combinations of the technical features.
The above-mentioned embodiments only express several embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (10)
1. A circuit breaker, comprising:
static contact;
the moving contact can rotate relative to the static contact so as to enable the contact point of the moving contact to be in contact with and/or separated from the contact point of the static contact;
the arc extinguishing grid pieces are used for extinguishing electric arcs generated by the fixed contact and the movable contact in a separated mode;
the gas generating structure coats the arc extinguishing grid plate; and
the permanent magnet is provided with a first magnetic pole and a second magnetic pole, and an included angle between the connecting direction of the first magnetic pole and the second magnetic pole and the cambered surface formed by the rotation of the movable contact is 80-100 degrees.
2. The circuit breaker of claim 1, wherein the gas generating structures correspond one-to-one to the arc chute plates.
3. The circuit breaker of claim 1, wherein the plurality of arc chute plates are divided into two portions, and the two portions of the arc chute plates are respectively located on opposite sides of the permanent magnet.
4. The circuit breaker of claim 1, wherein a line connecting the first magnetic pole and the second magnetic pole is perpendicular to a plane formed by rotation of the movable contact.
5. The circuit breaker of claim 1, further comprising an insulating cover that encases the permanent magnet.
6. The circuit breaker of claim 1, wherein said insulating enclosure and said gas generating structure are formed from the same gas generating insulating material.
7. The circuit breaker according to claim 6, characterized in that said gas-generating insulating material is polyoxymethylene abbreviation, polytetrafluoroethylene or polyamide fiber.
8. The circuit breaker of claim 1, further comprising a male base to which one ends of the insulating cover and the permanent magnet are fixed.
9. The circuit breaker of claim 1, wherein the permanent magnet is made of an alloy permanent magnet material or a ferrite permanent magnet material.
10. The circuit breaker of claim 1, wherein a plurality of the arc chute plates are arranged in parallel at equal intervals.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911093943.2A CN110853999A (en) | 2019-11-11 | 2019-11-11 | Circuit breaker |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911093943.2A CN110853999A (en) | 2019-11-11 | 2019-11-11 | Circuit breaker |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110853999A true CN110853999A (en) | 2020-02-28 |
Family
ID=69601085
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911093943.2A Pending CN110853999A (en) | 2019-11-11 | 2019-11-11 | Circuit breaker |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110853999A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022252824A1 (en) * | 2021-06-03 | 2022-12-08 | 厦门宏发开关设备有限公司 | Breaking device |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63126135A (en) * | 1986-11-14 | 1988-05-30 | 松下電工株式会社 | Arc extinguisher |
| CN207664014U (en) * | 2017-12-25 | 2018-07-27 | 上海良信电器股份有限公司 | Arc-extinguishing chamber of circuit breaker structure-improved |
| CN209071258U (en) * | 2019-01-10 | 2019-07-05 | 常熟开关制造有限公司(原常熟开关厂） | Breaker with permanent magnet |
| CN209199867U (en) * | 2018-11-12 | 2019-08-02 | 上海良信电器股份有限公司 | The arc-chutes of breaker |
-
2019
- 2019-11-11 CN CN201911093943.2A patent/CN110853999A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63126135A (en) * | 1986-11-14 | 1988-05-30 | 松下電工株式会社 | Arc extinguisher |
| CN207664014U (en) * | 2017-12-25 | 2018-07-27 | 上海良信电器股份有限公司 | Arc-extinguishing chamber of circuit breaker structure-improved |
| CN209199867U (en) * | 2018-11-12 | 2019-08-02 | 上海良信电器股份有限公司 | The arc-chutes of breaker |
| CN209071258U (en) * | 2019-01-10 | 2019-07-05 | 常熟开关制造有限公司(原常熟开关厂） | Breaker with permanent magnet |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| WO2022252824A1 (en) * | 2021-06-03 | 2022-12-08 | 厦门宏发开关设备有限公司 | Breaking device |
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| PB01 | Publication | ||
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20200228 |
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