CN115206726A - Multi-pole longitudinal magnetic field vacuum arc extinguish chamber contact structure - Google Patents
Multi-pole longitudinal magnetic field vacuum arc extinguish chamber contact structure Download PDFInfo
- Publication number
- CN115206726A CN115206726A CN202210736749.7A CN202210736749A CN115206726A CN 115206726 A CN115206726 A CN 115206726A CN 202210736749 A CN202210736749 A CN 202210736749A CN 115206726 A CN115206726 A CN 115206726A
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- Prior art keywords
- contact
- magnetic field
- iron cores
- longitudinal magnetic
- iron
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Links
- 230000005405 multipole Effects 0.000 title claims abstract description 15
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical group [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 107
- 229910052742 iron Inorganic materials 0.000 claims description 12
- PMVSDNDAUGGCCE-TYYBGVCCSA-L Ferrous fumarate Chemical group [Fe+2].[O-]C(=O)\C=C\C([O-])=O PMVSDNDAUGGCCE-TYYBGVCCSA-L 0.000 claims description 2
- 230000008602 contraction Effects 0.000 claims description 2
- 238000002679 ablation Methods 0.000 abstract description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 7
- 238000010891 electric arc Methods 0.000 description 4
- 238000009792 diffusion process Methods 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000002776 aggregation Effects 0.000 description 1
- 238000004220 aggregation Methods 0.000 description 1
- 230000002238 attenuated effect Effects 0.000 description 1
- 230000008859 change Effects 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000008092 positive effect Effects 0.000 description 1
- 238000003466 welding Methods 0.000 description 1
Images
Classifications
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01H—ELECTRIC SWITCHES; RELAYS; SELECTORS; EMERGENCY PROTECTIVE DEVICES
- H01H33/00—High-tension or heavy-current switches with arc-extinguishing or arc-preventing means
- H01H33/60—Switches wherein the means for extinguishing or preventing the arc do not include separate means for obtaining or increasing flow of arc-extinguishing fluid
- H01H33/66—Vacuum switches
- H01H33/664—Contacts; Arc-extinguishing means, e.g. arcing rings
Landscapes
- Arc-Extinguishing Devices That Are Switches (AREA)
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
Abstract
The invention relates to a contact structure of a vacuum arc-extinguishing chamber with a multi-pole longitudinal magnetic field.A contact piece is provided with an iron core or a plurality of iron cores, and the iron cores can enable an arcing region between contacts to generate the multi-pole longitudinal magnetic field and inhibit vacuum arc from shrinking. In the invention, the plurality of iron cores are uniformly arranged at intervals on the end surfaces of the two contact blades which are far away from each other, and the iron cores on the two contact blades are arranged in a staggered manner, so that a multistage longitudinal magnetic field can be formed when current flows through the contact blades. All the iron cores are not contacted with the conducting rod but only contacted with the contact blade, and the temperature rise of the vacuum arc-extinguishing chamber is promoted under the condition that the resistance of the contact structure is kept to the maximum extent. The distance between every two adjacent iron cores is greater than the shortest distance between upper iron core and the lower iron core, so that the generated longitudinal magnetic field is stronger, the contact blade can be more uniformly burnt, the ablation of the contact is reduced, the electric service life of the contact is prolonged, and the breaking capacity is improved.
Description
Technical Field
The invention belongs to the technical field of improvement of a contact structure of a vacuum arc-extinguishing chamber, and particularly relates to a contact structure of a vacuum arc-extinguishing chamber with a multi-pole longitudinal magnetic field.
Background
The electrode structure of the vacuum arc-extinguishing chamber is composed of cylindrical contacts, and the opening capacity of the common cylindrical contacts is limited, so that the vacuum arc-extinguishing chamber can only cut off the current below 10 kA. The structure of the contact can be properly designed to generate a magnetic field when current flows through the contact, the direction of the generated magnetic field of the transverse magnetic field is perpendicular to the direction of the current (the direction of the magnetic field is the radial direction of the contact), and the electric arc is controlled through the action of the magnetic field. The breaking voltage of the transverse magnetic field contact is generally not higher than 24kV, but the magnetic field is attenuated quickly along with the increase of the opening distance, so that the transverse magnetic field contact is not suitable for a vacuum arc-extinguishing chamber with large opening distance. If a longitudinal magnetic field is formed at the contact, the shrinkage of the vacuum arc can be inhibited, so that the current threshold for forming anode spots is improved, the vacuum arc can still be kept in a diffusion state under the condition of large current, the ablation of the contact is reduced, the breaking capacity of the vacuum switch is improved, and the vacuum switch is suitable for a high-voltage large-opening-distance vacuum arc-extinguishing chamber, but the processing technology is complex, the processing cost is high, and the resistance of a conductive loop is large.
Disclosure of Invention
The invention aims to overcome the defects of the prior art and provides a multipolar longitudinal magnetic field vacuum arc extinguish chamber contact structure, wherein a plurality of magnetic conduction iron cores are arranged on the surface of a contact blade beside a conductive rod, and the magnetic conduction iron cores on two contact blades are distributed in a staggered manner.
The technical scheme adopted by the invention is as follows:
a multi-pole longitudinal magnetic field vacuum arc-extinguishing chamber contact structure comprises a pair of conducting rods and a pair of contact blades, wherein an iron core or a plurality of iron cores are arranged on the contact blades, and the iron cores can enable an arcing region between the contacts to generate a multi-pole longitudinal magnetic field and inhibit vacuum arc shrinkage.
Wherein, be provided with a plurality of iron cores on the contact strip.
And a plurality of iron cores are respectively arranged on the end surfaces of two sides of the pair of contact blades, which are far away from each other.
Wherein none of the plurality of cores is connected to the conductive rod.
Wherein, set up evenly interval between a plurality of iron cores.
Wherein, the iron cores on the two contact blades are arranged in a staggered manner.
The distance between every two adjacent iron cores on the same contact blade is larger than the shortest distance between the iron cores on the two contact blades.
Each iron core is composed of a plurality of fan-shaped iron sheets with the same inner diameter and the same outer diameter and different central angle angles, the plurality of fan-shaped iron sheets are stacked together with the same circle center and the same central angle direction, and the central angle angles of the plurality of fan-shaped iron sheets are gradually reduced towards the direction far away from the contact blade.
The invention has the advantages and positive effects that:
in the invention, the plurality of iron cores are uniformly arranged at intervals on the end surfaces of the two contact blades which are far away from each other, and the iron cores on the two contact blades are arranged in a staggered manner, so that a multistage longitudinal magnetic field can be formed when current flows through the contact blades. All the iron cores are not contacted with the conducting rod but only contacted with the contact blade, and the temperature rise of the vacuum arc-extinguishing chamber is promoted under the condition that the resistance of the contact structure is kept to the maximum extent. The distance between every two adjacent iron cores is greater than the shortest distance between upper iron core and the lower iron core, so that the generated longitudinal magnetic field is stronger, the contact blade can be more uniformly burnt, the ablation of the contact is reduced, the electric service life of the contact is prolonged, and the breaking capacity is improved. Compared with the prior art, the magnetic field is more uniform, the arcing area is increased, the structure is simple, and the manufacturing is easy.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a front view of FIG. 1;
fig. 3 is a top view of the core of fig. 2;
fig. 4 is a schematic view of the core structure of fig. 1;
FIG. 5 is a schematic view of the upper contact half of FIG. 1;
FIG. 6 is a front view of FIG. 5;
FIG. 7 is a schematic top view of the core of the present invention in a staggered arrangement;
FIG. 8 is a graph of the total magnetic field strength of the present invention;
FIG. 9 is a schematic diagram of the magnetic force direction of the longitudinal magnetic field of the present invention;
FIG. 10 is a vector diagram of the magnetic field of the present invention;
FIG. 11 is a cross-sectional view of FIG. 10;
FIG. 12 is yet another schematic of the magnetic field vector of the present invention.
Detailed Description
The present invention is further illustrated by the following examples, which are intended to be illustrative, not limiting and are not intended to limit the scope of the invention.
A multipolar longitudinal magnetic field vacuum arc extinguish chamber contact structure is shown in figures 1-7 and comprises an upper conductive rod 1 and a lower conductive rod 4, wherein one ends of the upper conductive rod and the lower conductive rod, which are opposite to each other, are respectively provided with an upper contact blade 2 and a lower contact blade 3, the upper conductive rod and the lower conductive rod can move close to each other and drive the upper contact blade and the lower contact blade to be attached together, and the switch is closed; the upper conductive rod and the lower conductive rod can also move away from each other and drive the upper contact blade and the lower contact blade to be separated by a certain distance from the attaching state, so that the switch is turned off.
The innovation of the invention is that: the contact piece is provided with one iron core or a plurality of iron cores, and the iron cores can enable an arcing region between the contacts to generate a multi-pole longitudinal magnetic field and inhibit vacuum arc contraction. The iron core is arranged on two end surfaces of the pair of contact blades which are far away from each other. In this embodiment, 3 upper iron cores 6 are uniformly arranged on the upper end surface of the upper contact blade at intervals, and 3 lower iron cores 5 are uniformly arranged on the lower end surface of the lower contact blade at intervals. All the upper iron cores are not contacted with the upper conducting rod, and all the lower iron cores are not contacted with the lower conducting rod. The iron core can be fixedly connected to the contact piece in a welding mode.
Each upper iron core and each lower iron core are composed of a plurality of fan-shaped iron sheets with the same inner diameter and the same outer diameter and different central angle angles, the circle centers of the plurality of fan-shaped iron sheets are the same, the central angles of the plurality of fan-shaped iron sheets are stacked together towards the same direction, namely the surface areas of the fan-shaped iron sheets towards the direction away from the contact sheet are gradually reduced, and the plurality of fan-shaped iron sheets are stacked together to form an iron core similar to a horseshoe shape.
The included angle between two adjacent iron cores in 3 iron cores on each contact blade is 120 degrees, the distance between every two adjacent iron cores needs to be larger than the shortest distance between the iron cores on the two contact blades, namely the distance between every two adjacent iron cores is larger than the shortest distance between the upper iron core and the lower iron core.
In order to generate stronger magnetic field between the two contact blades, the iron cores on the two contact blades are arranged in a staggered mode. Namely, the included angle between each iron core and each lower iron core is 60 degrees.
The number of the iron cores on each contact blade can be adjusted according to actual needs, the number of poles of the longitudinal magnetic field is increased when the number of the iron cores is increased, the included angle between the iron cores is correspondingly reduced when the number of the iron cores is increased, the included angle between each upper iron core and each lower iron core is also correspondingly reduced, and vice versa, but the distance between every two adjacent iron cores is still required to be larger than the shortest distance between the upper iron core and the lower iron core, so that a stronger magnetic field is generated, and the purpose of the invention is achieved.
The iron cores have a magnetic conduction function, a magnetic field can be generated when current flows through the contact blades, the structural and position characteristics among the iron cores change the paths of magnetic lines of force to form a multi-stage longitudinal magnetic field among the iron cores, as shown in fig. 8, the schematic diagram of the total magnetic field intensity generated by the iron cores is shown in fig. 9, the schematic diagram of the direction of the magnetic lines of the longitudinal magnetic field generated by the iron cores is shown in fig. 9, the vector diagram of the magnetic field generated by the iron cores is shown in fig. 10, the cross-sectional diagram of fig. 10 is shown in fig. 11, and the schematic diagram of the other direction of the magnetic field vector generated by the iron cores is shown in fig. 12. Therefore, the arrangement of the plurality of iron cores improves the arc control capacity of the contact blade, so that the electric arc shrinkage is restrained, the aggregation type vacuum electric arc is converted into the diffusion type electric arc, and the limit value of the on-off short-circuit current is improved.
In the invention, the plurality of iron cores are uniformly arranged at intervals on the end surfaces of the two contact blades which are far away from each other, and the iron cores on the two contact blades are arranged in a staggered manner, so that a multistage longitudinal magnetic field can be formed when current flows through the contact blades. All the iron cores are not contacted with the conducting rod but only contacted with the contact blade, and the temperature rise of the vacuum arc-extinguishing chamber is promoted under the condition that the resistance of the contact structure is kept to the maximum extent. The distance between every two adjacent iron cores is greater than the shortest distance between upper iron core and the lower iron core, so that the generated longitudinal magnetic field is stronger, the contact blade can be more uniformly burnt, the ablation of the contact is reduced, the electric service life of the contact is prolonged, and the breaking capacity is improved. Compared with the prior art, the magnetic field is more uniform, the arcing area is increased, the structure is simple, and the manufacturing is easy.
Claims (9)
1. The utility model provides a multipolar longitudinal magnetic field vacuum interrupter contact structure, includes a pair of conducting rod and a pair of contact blade, its characterized in that: the contact piece is provided with one iron core or a plurality of iron cores, and the iron cores can enable an arcing region between the contacts to generate a multi-pole longitudinal magnetic field and inhibit vacuum arc contraction.
2. A multipole longitudinal magnetic field vacuum interrupter contact structure according to claim 1, characterized in that: and a plurality of iron cores are arranged on the contact piece.
3. A multipole longitudinal magnetic field vacuum interrupter contact structure according to claim 2, characterized in that: and a plurality of iron cores are respectively arranged on the end surfaces of the two sides of the pair of contact blades which are far away from each other.
4. A multipole longitudinal magnetic field vacuum interrupter contact structure according to claim 3, characterized in that: the plurality of iron cores are not connected with the conductive rod.
5. A multipole longitudinal magnetic field vacuum interrupter contact structure according to claim 2 or 3 or 4, characterized in that: the plurality of iron cores are arranged at even intervals.
6. The structure of claim 5, wherein: the iron cores on the two contact blades are arranged in a staggered mode.
7. A multipole longitudinal magnetic field vacuum interrupter contact structure according to claim 5, characterized in that: the distance between every two adjacent iron cores on the same contact blade is larger than the shortest distance between the iron cores on the two contact blades.
8. The structure of claim 6, wherein: the distance between every two adjacent iron cores on the same contact blade is larger than the shortest distance between the iron cores on the two contact blades.
9. A multipole longitudinal magnetic field vacuum interrupter contact structure according to claim 1 or 2 or 3 or 4 or 6 or 7 or 8, characterized in that: each iron core is composed of a plurality of fan-shaped iron sheets with the same inner and outer diameters and different central angles, the circle centers of the fan-shaped iron sheets are the same, the central angles of the fan-shaped iron sheets are stacked together in the same direction, and the central angles of the fan-shaped iron sheets are gradually reduced in the direction far away from the contact blade.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210736749.7A CN115206726A (en) | 2022-06-27 | 2022-06-27 | Multi-pole longitudinal magnetic field vacuum arc extinguish chamber contact structure |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202210736749.7A CN115206726A (en) | 2022-06-27 | 2022-06-27 | Multi-pole longitudinal magnetic field vacuum arc extinguish chamber contact structure |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN115206726A true CN115206726A (en) | 2022-10-18 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202210736749.7A Pending CN115206726A (en) | 2022-06-27 | 2022-06-27 | Multi-pole longitudinal magnetic field vacuum arc extinguish chamber contact structure |
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| CN (1) | CN115206726A (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1337726A (en) * | 2001-07-18 | 2002-02-27 | 西安交通大学 | Method of utilizing non-uniform longitudinal magnetic field in inhibiting vacuum arc aggregation |
| CN1393901A (en) * | 2001-06-27 | 2003-01-29 | 京东方科技集团股份有限公司 | Contact for integrated multi-pole power switch with longitudinal magnetic field |
| US20040035827A1 (en) * | 2001-02-28 | 2004-02-26 | Jianchang Ren | Multipolar itegrated contact for power switchgear |
| JP2011096474A (en) * | 2009-10-29 | 2011-05-12 | Toshiba Corp | Vacuum valve |
| CN107068478A (en) * | 2016-12-29 | 2017-08-18 | 厦门宏发电力电器有限公司 | A kind of vacuum interrupter core type longitudinal magnetic-field electrode structure and its assembly method |
| CN110379670A (en) * | 2019-07-18 | 2019-10-25 | 西安交通大学 | A kind of high throughflow ability vacuum interrupter with fixed fracture |
-
2022
- 2022-06-27 CN CN202210736749.7A patent/CN115206726A/en active Pending
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040035827A1 (en) * | 2001-02-28 | 2004-02-26 | Jianchang Ren | Multipolar itegrated contact for power switchgear |
| CN1393901A (en) * | 2001-06-27 | 2003-01-29 | 京东方科技集团股份有限公司 | Contact for integrated multi-pole power switch with longitudinal magnetic field |
| CN1337726A (en) * | 2001-07-18 | 2002-02-27 | 西安交通大学 | Method of utilizing non-uniform longitudinal magnetic field in inhibiting vacuum arc aggregation |
| JP2011096474A (en) * | 2009-10-29 | 2011-05-12 | Toshiba Corp | Vacuum valve |
| CN107068478A (en) * | 2016-12-29 | 2017-08-18 | 厦门宏发电力电器有限公司 | A kind of vacuum interrupter core type longitudinal magnetic-field electrode structure and its assembly method |
| CN110379670A (en) * | 2019-07-18 | 2019-10-25 | 西安交通大学 | A kind of high throughflow ability vacuum interrupter with fixed fracture |
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