CN115206726A - A multi-pole longitudinal magnetic field vacuum interrupter contact structure - Google Patents

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

A multi-pole longitudinal magnetic field vacuum interrupter contact structure

technical field

The invention belongs to the technical field of vacuum interrupter contact structure improvement, in particular to a multi-pole longitudinal magnetic field vacuum interrupter contact structure.

Background technique

The electrode structure of the vacuum interrupter is composed of cylindrical contacts. The starting capacity of ordinary cylindrical contacts is limited and can only interrupt currents below 10kA. By properly designing the structure of the contact, a magnetic field can be generated when the current flows through the contact, and the magnetic field direction of the generated transverse magnetic field is perpendicular to the current direction (the direction of the magnetic field is the radial direction of the contact). control. The breaking voltage of the transverse magnetic field contact is generally not higher than 24kV, but the magnetic field decays faster with the increase of the opening distance, so it is not suitable for use in the vacuum interrupter with a large opening distance. If a longitudinal magnetic field is formed at the contact, the contraction of the vacuum arc can be suppressed, thereby increasing the current threshold for forming anode spots, so that the vacuum arc can remain in a diffused state under the condition of high current, reducing the ablation of the contact and improving the The breaking capacity of the vacuum switch is improved, and it is suitable for the vacuum interrupter with high voltage and large opening distance, but the processing technology is complicated, the processing cost is high, and the resistance of the conductive circuit is large.

SUMMARY OF THE INVENTION

The purpose of the present invention is to overcome the deficiencies of the prior art, and to provide a multi-pole in which a plurality of conductive cores are arranged on the surface of the contact piece beside the conductive rod, and the conductive cores on the two contact pieces are staggered. Longitudinal magnetic field vacuum interrupter contact structure.

The technical scheme adopted by the present invention is:

A multi-pole longitudinal magnetic field vacuum interrupter contact structure includes a pair of conductive rods and a pair of contact pieces, wherein an iron core or a plurality of iron cores are arranged on the contact pieces, and the iron cores can Creates a multi-pole longitudinal magnetic field in the arcing area between the contacts and suppresses vacuum arc contraction.

Wherein, the contact piece is provided with a plurality of iron cores.

Wherein, a plurality of iron cores are respectively provided on the end surfaces on both sides of the pair of contact pieces away from each other.

Wherein, the plurality of iron cores are not connected with the conductive rod.

Wherein, the plurality of iron cores are evenly spaced apart.

Wherein, the iron cores on the two contact pieces are arranged in a staggered manner.

Wherein, the distance between every two adjacent iron cores on the same contact piece is greater than the shortest distance between the iron cores on the two contact pieces.

Wherein, each of the iron cores is composed of a plurality of fan-shaped iron sheets with the same inner and outer diameters but different central angle angles. The angle of the central angle gradually decreases away from the contact blade.

The advantages and positive effects of the present invention are:

In the present invention, by arranging a plurality of iron cores at even intervals on the end faces of the two contact pieces away from each other, and the iron cores on the two contact pieces are arranged staggered with each other, when the current flows through the contact pieces, the Multilevel longitudinal magnetic field. All the iron cores are not in contact with the conductive rod but only with the contact piece, which increases the temperature rise of the vacuum interrupter while retaining the resistance of the contact structure to the greatest extent. The distance between each two adjacent iron cores is greater than the shortest distance between the upper iron core and the lower iron core, so that the generated longitudinal magnetic field is stronger, which can make the arc of the contact piece more uniform and reduce the ablation of the contact. Increase the electrical life of the contacts and improve the breaking capacity. Compared with the prior art, the magnetic field is more uniform, the arc area is increased, the structure is simple, and the manufacture is easy.

Description of drawings

Fig. 1 is the structural representation of the present invention;

Fig. 2 is the front view of Fig. 1;

Fig. 3 is the top view of the iron core in Fig. 2;

Fig. 4 is the iron core structure schematic diagram in Fig. 1;

FIG. 5 is a schematic structural diagram of the upper part of the contact in FIG. 1;

Fig. 6 is the front view of Fig. 5;

7 is a schematic top-view projection view of the iron cores staggered with each other in the present invention;

8 is a schematic diagram of the total magnetic field intensity of the present invention;

Fig. 9 is the schematic diagram of the longitudinal magnetic field magnetic force direction of the present invention;

Fig. 10 is the magnetic field vector diagram of the present invention;

Figure 11 is a cross-sectional view of Figure 10;

FIG. 12 is another schematic diagram of the magnetic field vector of the present invention.

Detailed ways

The present invention will be further described below with reference to the examples. The following examples are illustrative, not restrictive, and the protection scope of the present invention cannot be limited by the following examples.

A multi-pole longitudinal magnetic field vacuum interrupter contact structure, as shown in Figures 1-7, includes an upper conductive rod 1 and a lower conductive rod 4, and the opposite ends of the upper conductive rod and the lower conductive rod are respectively provided with upper contact pieces 2 and the lower contact piece 3, the upper conductive rod and the lower conductive rod can move close to each other and drive the upper contact piece and the lower contact piece to fit together to complete the closing of the switch; the upper conductive rod and the lower conductive rod can also mutually Move away from the switch and drive the upper contact piece and the lower contact piece to separate a certain distance from the fitted state to complete the disconnection of the switch.

The innovation of the present invention lies in that an iron core or a plurality of iron cores are arranged on the contact piece, and the iron core can generate a multi-pole longitudinal magnetic field in the arcing area between the contacts and restrain the vacuum arc from shrinking. The iron core is arranged on the two end faces of the pair of contact pieces away from each other. In this embodiment, three upper iron cores 6 are evenly spaced on the upper end surface of the upper contact piece, and three lower iron cores 5 are evenly spaced on the lower end surface of the lower contact piece. All the upper iron cores are not in contact with the upper conductive rods, and all the lower iron cores are not in contact with the lower conductive rods. The iron core can be fixedly connected to the contact piece by welding.

Each upper iron core and each lower iron core are composed of a plurality of fan-shaped iron sheets with the same inner and outer diameters but different central angle angles. The angle of the central angle of the iron sheet gradually decreases in the direction away from the contact sheet, that is, the surface area of the sector-shaped iron sheet gradually decreases in the direction away from the contact sheet.

The included angle between two adjacent iron cores among the three iron cores on each contact piece is 120 degrees, and the distance between each two adjacent iron cores must be greater than the distance between the iron cores on the two contact pieces. The shortest distance between them, that is, the distance between every two adjacent iron cores is greater than the shortest distance between the upper iron core and the lower iron core.

In order to generate a stronger magnetic field between the two contact pieces, the iron cores on the two contact pieces are staggered. That is, the included angle between each iron core and each lower iron core is 60 degrees.

The number of iron cores on each contact piece can be adjusted according to actual needs. When the number of iron cores increases, the number of poles of the longitudinal magnetic field increases. When the number of iron cores increases, the angle between the iron cores decreases accordingly. The angle between each lower iron core is also reduced accordingly, and vice versa, but it is still necessary to ensure that the distance between every two adjacent iron cores is greater than the shortest distance between the upper iron core and the lower iron core, so as to A stronger magnetic field is generated to achieve the purpose of the present invention.

The iron core has a magnetic permeability, which can generate a magnetic field when the current flows through the contact piece. The structure and position characteristics of the above-mentioned multiple iron cores change the path of the magnetic field lines so that a multi-level longitudinal magnetic field can be formed between the multiple iron cores. , Figure 8 is a schematic diagram of the total magnetic field intensity generated by the above-mentioned multiple iron cores, Figure 9 is a schematic diagram of the direction of the longitudinal magnetic field lines generated by the above-mentioned multiple iron cores, and Figure 10 is a schematic diagram of the above-mentioned multiple iron cores generated Fig. 11 is a cross-sectional view of Fig. 10, and Fig. 12 is a schematic diagram of another direction of the magnetic field vector generated by the above-mentioned multiple iron cores. It can be seen that the arrangement of the above-mentioned multiple iron cores improves the arc control ability of the contact piece, thereby suppressing arc shrinkage, converting a concentrated vacuum arc into a diffusion arc, and increasing the limit value of breaking short-circuit current.

In the present invention, by arranging a plurality of iron cores at even intervals on the end faces of the two contact pieces away from each other, and the iron cores on the two contact pieces are arranged staggered with each other, when the current flows through the contact pieces, the Multilevel longitudinal magnetic field. All the iron cores are not in contact with the conductive rod but only with the contact piece, which increases the temperature rise of the vacuum interrupter while retaining the resistance of the contact structure to the greatest extent. The distance between each two adjacent iron cores is greater than the shortest distance between the upper iron core and the lower iron core, so that the generated longitudinal magnetic field is stronger, which can make the arc of the contact piece more uniform and reduce the ablation of the contact. Increase the electrical life of the contacts and improve the breaking capacity. Compared with the prior art, the magnetic field is more uniform, the arc area is increased, the structure is simple, and the manufacture 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.

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