CN110828230A - Longitudinal magnetic contact structure of vacuum arc extinguish chamber - Google Patents
Longitudinal magnetic contact structure of vacuum arc extinguish chamber Download PDFInfo
- Publication number
- CN110828230A CN110828230A CN201911108578.8A CN201911108578A CN110828230A CN 110828230 A CN110828230 A CN 110828230A CN 201911108578 A CN201911108578 A CN 201911108578A CN 110828230 A CN110828230 A CN 110828230A
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- Prior art keywords
- contact
- longitudinal magnetic
- cup
- grooves
- notches
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Links
- 230000009286 beneficial effect Effects 0.000 abstract description 4
- 101100327917 Caenorhabditis elegans chup-1 gene Proteins 0.000 description 5
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 description 1
- 229910052802 copper Inorganic materials 0.000 description 1
- 239000010949 copper Substances 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000010891 electric arc Methods 0.000 description 1
- 230000002349 favourable effect Effects 0.000 description 1
- 230000004907 flux Effects 0.000 description 1
- 230000017525 heat dissipation Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000011084 recovery 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
- H01H33/6642—Contacts; Arc-extinguishing means, e.g. arcing rings having cup-shaped contacts, the cylindrical wall of which being provided with inclined slits to form a coil
Landscapes
- High-Tension Arc-Extinguishing Switches Without Spraying Means (AREA)
- Arc-Extinguishing Devices That Are Switches (AREA)
Abstract
The invention discloses a longitudinal magnetic contact structure of a vacuum arc extinguish chamber. Comprises a contact cup (1), wherein the open end of the contact cup (1) is connected with a contact blade (2); inclined grooves (3) are distributed on the cup wall of the contact cup (1) along the circumferential direction, the inclined grooves (3) penetrate through the opening end to form notches (4) on the end face of the opening end, the notches (4) are tangent to the inner cup wall (5) of the contact cup (1), and the part of the cup wall of the contact cup (1) obtained by cutting between two adjacent inclined grooves (3) forms a coil (8); the edge of the contact blade (2) is circumferentially distributed with longitudinal magnetic grooves (6), the longitudinal magnetic grooves (6) can be axially aligned with the notches (4), and one ends of the longitudinal magnetic grooves (6) penetrate through the edge of the contact blade (2). The invention can realize the purpose of low resistance under the condition of keeping the breaking capacity of the short-circuit current unchanged, and is beneficial to miniaturization design.
Description
Technical Field
The invention relates to the technical field of vacuum arc-extinguishing chambers, in particular to a longitudinal magnetic contact structure of a vacuum arc-extinguishing chamber.
Background
The vacuum arc-extinguishing chamber is the core device of the vacuum switch, and is responsible for controlling the arc current, and the circuit is cut off and closed by the opening and closing movement of a pair of contacts with magnetic fields in the vacuum arc-extinguishing chamber. In the existing small-sized vacuum arc-extinguishing chamber, a contact cup is used for openingThe contact cup coil of the cup-shaped longitudinal magnetic contact structure used for arc control comprises a contact cup, the wall of the contact cup is provided with an inclined groove, and the inclined groove rotates towards the direction of the open end of the contact cup along the circumference of the contact cup and penetrates through the open end. This structure presents a drawback in use: in order to increase the current flowing path, improve the longitudinal magnetic field strength and enhance the breaking capacity of the short-circuit current of the vacuum arc-extinguishing chamber, the rotation angle of the chute is often required to be increasedα(at presentαOften between 90 and 103 deg.), but withαThe deeper the diagonal slots cut the wall of the contact cup (i.e., the longer the diagonal slots), the corresponding increase in coil resistance, particularly at the root of the coil, which may be large due to the small cross-sectional area. The short-circuit current breaking capacity and the rated working current are a pair of contradictions and are difficult to realize, and only can be considered mutually. The vacuum arc-extinguishing chamber with high breaking capacity often has larger resistance value, the phenomenon of overhigh temperature rise often occurs when the vacuum arc-extinguishing chamber is used, a large-area pure copper radiator is needed for heat dissipation, the cost is overhigh, otherwise, the reliability and the stability of the operation of the switch are influenced because the switch contact is overheated. For the temperature rise problem, when a user puts forward a low resistance requirement but the required short-circuit current breaking capacity must be met, the common practice is to increase the thickness of the coil outwards, and thicken the coil outwards, so that the effective diameter is reduced, and the short-circuit current breaking capacity is reduced. In order to overcome the problem, only a method of enlarging the coil of the contact cup can be adopted, but the whole diameter of the vacuum arc-extinguishing chamber is enlarged, and the miniaturization design of the device is not facilitated.
Disclosure of Invention
The invention aims to provide a longitudinal magnetic contact structure of a vacuum arc-extinguishing chamber. The invention can realize the purpose of low resistance under the condition of keeping the breaking capacity of the short-circuit current unchanged, and is beneficial to miniaturization design.
The technical scheme of the invention is as follows: a longitudinal magnetic contact structure of a vacuum arc extinguish chamber comprises a contact cup, wherein a contact blade is connected with the open end of the contact cup; inclined grooves are distributed on the wall of the contact cup along the circumferential direction, the inclined grooves penetrate through the opening end to form notches on the end face of the opening end, the notches are tangent to the inner cup wall of the contact cup, and the part of the contact cup wall, which is obtained by cutting between two adjacent inclined grooves, forms a coil; the edge of the contact blade is circumferentially distributed with longitudinal magnetic grooves, the longitudinal magnetic grooves can be axially aligned with the notches, and one end of each longitudinal magnetic groove penetrates through the edge of the contact blade.
In the longitudinal magnetic contact structure of the vacuum arc-extinguishing chamber, the end part of the other end of the longitudinal magnetic slot exceeds a diameter line perpendicular to the longitudinal magnetic slot.
In the longitudinal magnetic contact structure of the vacuum arc-extinguishing chamber, the end part of the other end of the longitudinal magnetic slot is connected with a straight slot, and the straight slot is perpendicular to the longitudinal magnetic slot.
In the longitudinal magnetic contact structure of the vacuum arc-extinguishing chamber, when the longitudinal magnetic grooves are axially aligned with the notches, at least one notch is arranged between every two adjacent longitudinal magnetic grooves at intervals.
Has the advantages that: compared with the prior art, the notch of the inclined groove on the end face of the opening end of the contact cup is tangent to the inner cup wall of the contact cup, and the longitudinal magnetic groove arranged on the contact piece is aligned with the notch in the axial direction of the contact cup; by the structure, the longitudinal magnetic groove on the contact blade can block the current from the coil of the contact cup, so that the current is prevented from directly flowing to the center of the contact blade, and the current can flow to the center of the contact blade only by bypassing the longitudinal magnetic groove; therefore, the structure can effectively increase the circulation path of current, improve the longitudinal magnetic field intensity and enhance the breaking capacity of the vacuum arc-extinguishing chamber. Referring to fig. 1 and 6, arrows indicate the flow directions of respective currents: in FIG. 1, when current flows to the contact blade, the current needs to bypass the longitudinal magnetic slot to flow to the center of the contact blade; in FIG. 6, current flows directly to the center of the contact blade when it flows to the contact blade; with this structure, the longitudinal magnetic flux groove blocks the current.
As can be seen by comparing FIGS. 4 and 8, the notches of the present invention are tangential to the inner cup wall, with conventional notches being primarily radial to the contact cup.
The longitudinal magnetic field generated by the contact structure is equivalent to the superposition of the longitudinal magnetic field generated by the coil between the inclined grooves of the contact cup and the longitudinal magnetic field generated by the longitudinal magnetic groove on the contact blade, and the structure has the following characteristics:
first, the rotation angle of the inclined groove on the contact cupαCan be reduced (the invention can be used forαFrom 90-103 degrees to 80-85 degrees in the prior art, the contact cup is inclinedAngle of rotation of the troughαThe reduced part of the magnetic field is compensated by the magnetic field generated by the longitudinal magnetic slot on the contact blade; by the structure, the breaking capacity of the short-circuit current is ensured to be unchanged, and meanwhile, the short-circuit current is prevented from breakingαThe resistance of the contact cup coil is reduced.
Secondly, because the starting point and the end point of the chute are different from the conventional positions, the starting point and the end point of the chute have almost the same cross section, and the bottleneck problem of increased resistance caused by the over-small cross section of the end point of the chute in a common contact structure is solved. The specific principle is as follows: the notch is tangent to the inner cup wall of the contact cup, so that two adjacent chutes are basically parallel, and meanwhile, the end point of each chute is far away from the turning point of the elliptic section, so that the sectional areas of the coils in the current direction are basically equal, the phenomenon that the sectional area is reduced near the turning point of the elliptic section by the root of each coil is avoided, and the resistance of each coil is further reduced.
Under the condition that the diameter of the contact is not increased, the temperature rise of the contact during working can be effectively controlled due to the reduction of the resistance of the coil, so that the rated current value of the vacuum arc extinguish chamber can be increased, and meanwhile, the breaking capacity of the vacuum arc extinguish chamber can be ensured. See fig. 3 and 7: comparing the position of the oval circle marks in fig. 3 and fig. 7, the sectional area of the coil root of the present invention is increased, thereby reducing the root resistance.
Thirdly, because the magnetic field of the contact structure is the superposition of the magnetic field generated by the coil of the contact cup and the magnetic field generated by the longitudinal magnetic slot of the contact blade, the diameter of the contact can be reduced by utilizing the superposed strong magnetic field on the occasion with smaller rated working current, and then the diameter of the vacuum arc-extinguishing chamber is reduced, and the miniaturized structure of the vacuum arc-extinguishing chamber with smaller volume is obtained.
In addition, the conventional contact structure has weaker magnetic field strength and weaker arc control capability as the contact structure is closer to the edge position of the contact (see fig. 10). Therefore, in order to enhance the arc control capability, the edge of the contact needs to extend outwards, the diameter of the contact cup needs to be increased, and the effective area of the contact needs to be increased; and the outward extension of contact edge can increase the contact diameter, and then has increased vacuum interrupter's whole diameter, is unfavorable for the miniaturized design of device. When the coil current flows to the contact blade, the coil current can flow to the central position of the contact blade only by bypassing the longitudinal magnetic slot, so that when the current flows along the edge of the contact blade, a magnetic field is generated at the edge of the contact, the fringe magnetic field of the contact is increased (see figure 9), the control capability of the edge electric arc of the contact is improved, and the breaking capability and the stability of the short-circuit current are enhanced. The area where the fringe magnetic field is generated is shown in fig. 5 in a hatched portion, and the arrow in fig. 5 indicates the direction of the current. The improvement of the arc control capability of the edge magnetic field is equivalent to the improvement of the effective area of the contact (especially the area of the edge of the contact), so that the diameter of the contact cup can be designed to be smaller under the design requirement of the same arc control capability, and the miniaturization of a device is further facilitated. In addition, due to the enhancement of the arc control capability, the thickness of the contact cup coil can be properly increased inwards, and the resistance value of the contact cup coil is further reduced; this provides more design margin for the designer, so that the design difficulty is reduced. Compared with the conventional contact structure, the contact structure is also a cup-shaped longitudinal magnetic contact structure with the diameter phi of 60, the resistance of the conventional contact structure is 13-18 mu omega, and the resistance of the contact structure is 7-9 mu omega, so that the resistance reduction of the contact structure is very obvious.
The end part of the other end of the longitudinal magnetic slot exceeds a diameter line vertical to the longitudinal magnetic slot; the structure can be more favorable for the obstruction of the longitudinal magnetic slot to the current on the coil and the increase of the current circulation path.
The end part of the other end of the longitudinal magnetic slot is connected with a straight slot vertical to the longitudinal magnetic slot; the straight groove structure can effectively reduce eddy current generated on the surface of the contact, enhance the short-circuit current breaking capacity and medium recovery speed, and is beneficial to the breaking of asymmetric current.
At least one notch is arranged between two adjacent longitudinal magnetic grooves at intervals; through this structure, can make the distribution of coil field intensity along contact circumference balance according to actual need, if: when a notch is arranged between two adjacent longitudinal magnetic slots at interval, the field intensity of the corresponding coil is as follows: strong → weak → strong, strong magnetic field at both sides can compensate the middle weak magnetic field to some extent, so that the field intensity distribution is more balanced. The magnetic field distribution on the surface of the contact can obtain the circular distribution of the magnetic field strength, the magnetic field strength and the magnetic field strength if even grooving is adopted, and can obtain the circular distribution of the magnetic field strength.
In conclusion, the invention can realize the aim of low resistance under the condition of keeping the breaking capacity of the short-circuit current unchanged, and is beneficial to miniaturization design.
Drawings
FIG. 1 is a schematic structural view of the present invention;
FIG. 2 is a schematic view of the structure of the contact cup of the present invention;
FIG. 3 is a front view of the contact cup of the present invention;
FIG. 4 is a top view of FIG. 3;
FIG. 5 is a top view of the contact blade of the present invention;
FIG. 6 is a schematic diagram of a conventional contact;
FIG. 7 is a front view of a conventional contact cup;
FIG. 8 is a top view of FIG. 7;
FIG. 9 is a graph showing the trend of the magnetic field intensity from the center of the contact to the edge of the contact structure according to the present invention; wherein d is the magnetic field edge position;
FIG. 10 is a graph showing the trend of magnetic field strength from the center of the contact to the edge of a conventional contact structure; where d is the magnetic field edge position.
The labels in the figures are: 1-contact cup, 2-contact blade, 3-oblique groove, 4-notch, 5-inner cup wall, 6-longitudinal magnetic groove, 7-straight groove, 8-coil and 9-diameter line.
Detailed Description
The invention is further illustrated by the following figures and examples, which are not to be construed as limiting the invention.
Example 1. A longitudinal magnetic contact structure of a vacuum arc-extinguishing chamber is shown in figures 1-5 and comprises a contact cup 1, wherein the open end of the contact cup 1 is connected with a contact blade 2; inclined grooves 3 are distributed on the cup wall of the contact cup 1 along the circumferential direction, in the embodiment, 8 inclined grooves 3 are taken as an example (see fig. 1), the inclined grooves 3 penetrate through the opening end to form notches 4 on the end surface of the opening end, the notches 4 are tangent to an inner cup wall 5 of the contact cup 1 (see fig. 2 and 4), and a coil 8 is formed by a part obtained by cutting between two adjacent inclined grooves 3 on the cup wall of the contact cup 1 (see fig. 3); longitudinal magnetic slots 6 are distributed on the edge of the contact blade 2 along the circumferential direction, the longitudinal magnetic slots 6 can be axially aligned with the notches 4 (see fig. 1), and one end of each longitudinal magnetic slot 6 penetrates through the edge of the contact blade 2.
The other end of the longitudinal magnetic groove 6 is beyond a diameter line 9 perpendicular to the longitudinal magnetic groove 6. See fig. 5.
The other end of the longitudinal magnetic slot 6 is connected with a straight slot 7, and the straight slot 7 is vertical to the longitudinal magnetic slot 6. See fig. 5.
When the longitudinal magnetic grooves 6 are axially aligned with the notches 4, at least one notch 4 is arranged between every two adjacent longitudinal magnetic grooves 6. Referring to fig. 1, a notch 4 is spaced between two adjacent longitudinal magnetic slots 6 in the present embodiment.
Claims (4)
1. The utility model provides a magnetic contact structure is indulged to vacuum interrupter which characterized in that: comprises a contact cup (1), wherein the open end of the contact cup (1) is connected with a contact blade (2); inclined grooves (3) are distributed on the cup wall of the contact cup (1) along the circumferential direction, the inclined grooves (3) penetrate through the opening end to form notches (4) on the end face of the opening end, the notches (4) are tangent to the inner cup wall (5) of the contact cup (1), and the part of the cup wall of the contact cup (1) obtained by cutting between two adjacent inclined grooves (3) forms a coil (8); the edge of the contact blade (2) is circumferentially distributed with longitudinal magnetic grooves (6), the longitudinal magnetic grooves (6) can be axially aligned with the notches (4), and one ends of the longitudinal magnetic grooves (6) penetrate through the edge of the contact blade (2).
2. The longitudinal magnetic contact structure of a vacuum interrupter according to claim 1, characterized in that: the end part of the other end of the longitudinal magnetic slot (6) exceeds a diameter line (9) which is vertical to the longitudinal magnetic slot (6).
3. The longitudinal magnetic contact structure of a vacuum interrupter according to claim 1, characterized in that: the other end of the longitudinal magnetic slot (6) is connected with a straight slot (7), and the straight slot (7) is vertical to the longitudinal magnetic slot (6).
4. The longitudinal magnetic contact structure of a vacuum interrupter according to claim 1, characterized in that: when the longitudinal magnetic grooves (6) are axially aligned with the notches (4), at least one notch (4) is arranged between every two adjacent longitudinal magnetic grooves (6).
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911108578.8A CN110828230A (en) | 2019-11-13 | 2019-11-13 | Longitudinal magnetic contact structure of vacuum arc extinguish chamber |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201911108578.8A CN110828230A (en) | 2019-11-13 | 2019-11-13 | Longitudinal magnetic contact structure of vacuum arc extinguish chamber |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN110828230A true CN110828230A (en) | 2020-02-21 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201911108578.8A Pending CN110828230A (en) | 2019-11-13 | 2019-11-13 | Longitudinal magnetic contact structure of vacuum arc extinguish chamber |
Country Status (1)
| Country | Link |
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| CN (1) | CN110828230A (en) |
Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5099093A (en) * | 1990-02-01 | 1992-03-24 | Sachsenwerk Aktiengesellschaft | Vacuum switching chamber |
| CN1349236A (en) * | 2000-10-16 | 2002-05-15 | Lg产电株式会社 | Vacuum breaker used for vacuum switch |
| US20030066743A1 (en) * | 2001-09-12 | 2003-04-10 | Kabushiki Kaisha Meidensha | Contact arrangement for vacuum interrupter and vacuum interrupter using the contact arrangement |
| CN1969353A (en) * | 2004-06-30 | 2007-05-23 | 西门子公司 | Switching contact comprising annular supporting body for vacuum interrupters |
| CN102187418A (en) * | 2008-11-04 | 2011-09-14 | 日本Ae帕瓦株式会社 | Electrode structure for vacuum circuit breaker |
| CN103715008A (en) * | 2013-12-03 | 2014-04-09 | 西安交通大学 | Longitudinal and transverse composite type vacuum arc-extinguishing chamber contact structure |
| CN110120320A (en) * | 2019-06-06 | 2019-08-13 | 四川大学 | A kind of novel longitudinal magnetic contact system with embedded magnetism gathering rings and reversed contact cup |
| CN210467691U (en) * | 2019-11-13 | 2020-05-05 | 中国振华电子集团宇光电工有限公司（国营第七七一厂） | Vacuum arc-extinguishing chamber longitudinal magnetic contact structure capable of enhancing breaking capacity |
-
2019
- 2019-11-13 CN CN201911108578.8A patent/CN110828230A/en active Pending
Patent Citations (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5099093A (en) * | 1990-02-01 | 1992-03-24 | Sachsenwerk Aktiengesellschaft | Vacuum switching chamber |
| CN1349236A (en) * | 2000-10-16 | 2002-05-15 | Lg产电株式会社 | Vacuum breaker used for vacuum switch |
| US20030066743A1 (en) * | 2001-09-12 | 2003-04-10 | Kabushiki Kaisha Meidensha | Contact arrangement for vacuum interrupter and vacuum interrupter using the contact arrangement |
| CN1969353A (en) * | 2004-06-30 | 2007-05-23 | 西门子公司 | Switching contact comprising annular supporting body for vacuum interrupters |
| CN102187418A (en) * | 2008-11-04 | 2011-09-14 | 日本Ae帕瓦株式会社 | Electrode structure for vacuum circuit breaker |
| CN103715008A (en) * | 2013-12-03 | 2014-04-09 | 西安交通大学 | Longitudinal and transverse composite type vacuum arc-extinguishing chamber contact structure |
| CN110120320A (en) * | 2019-06-06 | 2019-08-13 | 四川大学 | A kind of novel longitudinal magnetic contact system with embedded magnetism gathering rings and reversed contact cup |
| CN210467691U (en) * | 2019-11-13 | 2020-05-05 | 中国振华电子集团宇光电工有限公司（国营第七七一厂） | Vacuum arc-extinguishing chamber longitudinal magnetic contact structure capable of enhancing breaking capacity |
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