CN105719895A - Vacuum arc-extinguishing chamber of novel double-acting mechanism - Google Patents

Abstract

<b>The present invention discloses a vacuum interrupter with a new double-action mechanism, which mainly includes two parts: an electromagnetic operating mechanism and an interrupter. The arc chamber is composed of contacts, conductive rods, and shielding covers. It is characterized in that the electromagnetic operating mechanism is placed in the arc extinguishing chamber and exists together with the arc extinguishing chamber in the vacuum shell, which solves the problem of dynamic sealing and reduces the overall size of the vacuum circuit breaker. volume of. The invention saves the bellows and greatly improves the service life of the interrupter; in order to increase the breaking speed, on the one hand, a symmetrical double-action structure is adopted, and the two contacts move in opposite directions at the same time; on the other hand, the structure is simplified, and the movement The part is only composed of contacts, conductive rods and armatures, and the equivalent mass of the action part is very small, which greatly improves the breaking speed and breaking capacity</b><b>,</b><b>reduces the opening and closing arc . </b>

Description

New Vacuum Interrupter of Double Action Mechanism

technical field

The invention relates to a vacuum interrupter, in particular to a novel vacuum interrupter structure with a double-action mechanism, and belongs to the technical field of high-voltage electrical appliances.

Background technique

Vacuum circuit breakers are widely used in power system line protection and switching, and maintain a dominant position in the medium voltage field. Its main function is to connect and disconnect the circuit by the opening and closing action of the contact. The shorter the time, the less impact damage to the equipment. The opening and closing are realized through the operating mechanism, so the performance and quality of the operating mechanism play an extremely important role in the working performance and reliability of the vacuum circuit breaker.

According to the fault statistics of power operation and substations in my country, the most prominent problems of vacuum circuit breakers are mechanical and insulation problems, especially mechanical faults, which are mainly due to the complex mechanical connection structure of the operating mechanism, the large number of parts, the required machining accuracy, and the complicated manufacturing process. , the cost is high, and the reliability of the product is not easy to guarantee.

In view of the disadvantages of the existing vacuum circuit breaker, such as complex structure and complex connection of the operating mechanism, resulting in high failure rate and low contact opening and closing speed, it is necessary to provide a simple and reliable vacuum circuit breaker that can quickly break the circuit.

Contents of the invention

The purpose of the present invention is to solve the problems existing in the prior art, aiming at the defects of complex structure and low breaking speed of the existing vacuum circuit breaker operating mechanism, to provide a new type of double vacuum circuit breaker with small volume, simple mechanical transmission and high initial breaking speed. The vacuum interrupter of the moving mechanism.

In order to solve the above technical problems, the present invention is achieved in this way.

The vacuum interrupter of the new double-action mechanism includes an electromagnetic operating mechanism and an interrupter. , conductive rod 5, shielding cover, soft connection conductive part 15, etc. The electromagnetic operating mechanism is placed in the arc extinguishing chamber, and exists together with the arc extinguishing chamber in the vacuum shell, which solves the problem of dynamic sealing and reduces the overall vacuum circuit breaker The volume; the new structure saves the bellows, which greatly improves the life of the arc extinguishing chamber; in order to improve the breaking speed, the contacts in the arc extinguishing chamber adopt a symmetrical double-action structure, and the two contacts move in opposite directions at the same time. The movement simplifies the structure. The moving part is only composed of contacts, conductive rods and armatures. The equivalent mass of the moving part is very small, which greatly improves the breaking speed and breaking capacity, and reduces the opening and closing arcs.

Among them, the electromagnetic operating mechanism is installed on the insulating support 2, the armature 4 is fixed with the conductive rod 5, connected with the conductive column 7 at the outlet end through the soft connection conductive member 15, the static iron core 3 is fixed on the insulating support 2, and connected with the insulating support 8 Flanges 1 are connected together.

The operating mechanism installed in the arc extinguishing chamber is connected to the outlet terminal through the flexible connection conductive member 15, so there is no problem of dynamic sealing, which improves the sealing performance of the arc extinguishing chamber and reduces the overall structure of the vacuum circuit breaker.

The armature 4 of the electromagnetic operating mechanism is fixed on the conductive rod 5 to realize the transmission of driving force, and the complicated mechanical transmission parts are omitted.

The vacuum interrupter of the new double-action mechanism has no mechanical transmission structure, and is only connected to the conductive rod 5 through the armature 4, so the mass of the moving part is very small, and the initial breaking speed is greatly improved.

The vacuum interrupter of the novel double-action mechanism omits the bellows, greatly improving the overall life of the interrupter.

The electromagnetic operating mechanism adopts magnetic materials with high magnetic permeability, which requires a small excitation current, which effectively reduces the volume of ferromagnetic materials and coils.

The vacuum interrupter adopts a symmetrical structure design up and down, and is equipped with an operating mechanism to realize double action, which greatly improves the breaking speed and breaking capacity, and reduces the opening and closing arcs.

The vacuum interrupter of the novel double-action mechanism is driven by a coaxial electromagnetic mechanism, which is easy to control and has good time concentration.

The current flowing through the armature generates a magnetic field, which strengthens the magnetic field between the contacts, which is beneficial to arc extinguishing.

Compared with the prior art, the beneficial effect of the present invention is.

In the present invention, the electromagnetic operating mechanism is placed in the arc extinguishing chamber, and the arc extinguishing chamber coexists in the vacuum shell, which solves the problem of dynamic sealing, greatly improves the sealing performance of the arc extinguishing chamber, and reduces the overall volume of the vacuum circuit breaker; The new structure saves the bellows, which greatly improves the life of the interrupter; in order to increase the breaking speed, on the one hand, a symmetrical double-action structure is adopted, and the two contacts move in opposite directions at the same time; on the other hand, the structure is simplified, and the movement The part is only composed of contacts, conductive rods and armatures, and the equivalent mass of the action part is very small, which greatly improves the breaking speed and breaking capacity, and reduces the opening and closing arcs.

Description of drawings

The present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.

Fig. 1 is a schematic diagram of the overall structure of the arc extinguishing chamber in the opening state of the present invention.

Fig. 2 is a schematic diagram of the overall structure of the arc extinguishing chamber when the switch is closed in the present invention.

Marks in the figure: 1. Flange; 2. Insulation bracket; 3. Static iron core; 4. Armature; 5. Conductive rod; 6. Main shield; Reaction force spring; 10, opening coil; 11, insulating cylinder; 12, bellows shield; 13, contact; 14, shell; 15, soft connection conductive part.

detailed description

As shown in Figures 1 to 2, the new bidirectional breaking interrupter and vacuum circuit breaker include an electromagnetic operating mechanism and an interrupter. The electromagnetic operating mechanism is composed of an armature 4, a static iron core 3, a coil, and a switching spring. , the arc extinguishing chamber is composed of contacts, conductive rods 5, shielding covers, soft connection conductive parts 15, etc. The electromagnetic operating mechanism is placed in the arc extinguishing chamber, and exists together with the arc extinguishing chamber in the vacuum shell, which solves the problem of dynamic sealing. The overall volume of the vacuum circuit breaker is reduced, and the new structure saves the bellows, which greatly improves the life of the arc extinguishing chamber. In order to improve the breaking speed, the contacts in the arc extinguishing chamber adopt a symmetrical double-action structure. The contacts move in opposite directions at the same time, which simplifies the structure. The moving part is only composed of contacts, conductive rods and armatures. The equivalent mass of the moving part is very small, which greatly improves the breaking speed and breaking capacity, and reduces the opening and closing arcs;

The electromagnetic operating mechanism is installed on the insulating support 2, the armature 4 is fixed to the conductive rod 5, connected to the conductive column 7 at the outlet end through the soft connection conductive piece 15, the static iron core 3 is fixed on the insulating support 2, and the insulating support 8 is connected to the The flanges 1 are connected together. Due to the double-action structure, the upper and lower structures of the arc extinguishing chamber are completely symmetrical. Only the movement of the upper half is explained, and the same is true for the lower half.

Referring to Figure 1, when the circuit breaker is opened, the opening coil 10 is energized, and a magnetic circuit is formed in the armature 4, the static iron core 3, and the air gap, and the suction force is generated to drive the armature 4 to drive the conductive rod 5 and the contact 13 to the opening direction. Movement, reaching the opening position, the two moving contacts are separated to realize circuit breaking, and at the same time, the opening spring 9 is compressed to store energy.

Referring to FIG. 2 , when the circuit breaker is closed, the opening coil 10 is de-energized, and the opening spring 9 provides a reaction force to drive the conductive rod 5 and the contact 13 to move to the closing position. The conductive rod 5 is electrically connected with the contact 13, and is connected with the conductive column 7 at the outlet end through a soft connection conductive member 15, and the lower half is the same, and a conductive circuit is formed by two contacts.

Claims (7)

1. the vacuum interrupter of novel double-movable mechanism, include electromagnetic operating mechanism and arc-chutes, it is characterized in: electromagnetic operating mechanism is by armature (4), static iron core (3), coil, sluice separating springs etc. form, arc-chutes are by contact, conducting rod (5), radome, be flexible coupling the compositions such as electric-conductor (15), electromagnetic operating mechanism is positioned in arc-chutes, it is collectively reside in vacuum casting with arc-chutes, contact in described arc-chutes adopts symmetrical double, two dynamic structure, two contacts move simultaneously round about, wherein electromagnetic operating mechanism is arranged on insulating support (2), armature (4) is fixed with conducting rod (5), it is connected with leading-out terminal conductive pole (7) by the electric-conductor that is flexible coupling (15), static iron core (3) is fixed on insulating support (2), linked together by insulated support (8) and flange (1).

2. the vacuum interrupter of novel double-movable mechanism according to claim 1, it is characterized in that: described in be installed in arc-chutes operating mechanism be connected with leading-out terminal by the electric-conductor (15) that is flexible coupling, the problem being absent from movable sealing, improve the sealing of arc-chutes, reduce the overall structure of vacuum circuit breaker.

3. the vacuum interrupter of novel double-movable mechanism according to claim 1, it is characterised in that: the armature (4) of electromagnetic operating mechanism is fixed on conducting rod (5), it is achieved driving force transmits, and eliminates the mechanical transmission part of complexity.

4. the vacuum interrupter of novel double-movable mechanism according to claim 1, it is characterised in that: electromagnetic operating mechanism adopts the magnetic material of high magnetic property, it is necessary to exciting current is little, effectively reduces the volume of ferromagnetic material and coil.

5. the vacuum interrupter of novel double-movable mechanism according to claim 1, it is characterized in that: described vacuum interrupter is laterally zygomorphic structural design, attach operating mechanism respectively and realize double; two dynamic, drastically increase breaking speed and breaking capacity, decrease point, combined floodgate electric arc.

6. the vacuum interrupter of novel double-movable mechanism according to claim 1, it is characterised in that adopt coaxial electrical magnetic mechanism to drive, it is easy to controlling, time centrality is relatively good.

7. the vacuum interrupter of novel double-movable mechanism according to claim 1, it is characterised in that flow through current induced magnetic field in armature, enhance the magnetic field between contact, be conducive to arc extinguishing.