CN218631872U - Synchronous structure of direct current breaker contact - Google Patents

Abstract

The utility model relates to a synchronization structure of direct current circuit breaker contact, including pivot (1), mechanism (2) and several contact (3), pivot (1) is including bush (12) and synchronizing shaft (13), and bush (12) are connected with mechanism (2), several contact (3) and synchronizing shaft (13) fixed connection form a whole contact structure, drive all looks contact (3) synchronous motion together when arbitrary contact (3) are repulsive. The utility model discloses a constitute an overall structure with each looks for the contact synchronizing shaft connection, realized the synchronous repulsion of each looks contact, the equipartition voltage makes every voltage that passes through the same, reduces the arc extinguishing degree of difficulty of every looks breakpoint.

Description

Synchronous structure of direct current breaker contact

Technical Field

The utility model belongs to the technical field of the low-voltage apparatus technique and specifically relates to a synchronous structure of direct current breaker contact is related to.

Background

The circuit breaker is a switching device capable of closing, carrying, and opening/closing a current under a normal circuit condition and a current under an abnormal circuit condition for a predetermined time. The circuit breaker is divided into a high-voltage circuit breaker and a low-voltage circuit breaker according to the application range of the circuit breaker, the application of the low-voltage direct current circuit breaker in a low-voltage distribution system is more and more extensive, the circuit breaker is used for the double tasks of protecting and controlling a circuit, and the circuit breaker plays a vital role in the safety, reliability and practicability of the whole circuit system.

The prior art multipole circuit breaker comprises, for each pole, a single-pole breaking unit and several contacts, several such units being housed next to each other in a moulded box to form the multipole circuit breaker. However, such systems do have some constraints, such as how the different modules are configured accordingly, including problems with the connection between the movable parts of the different monopole elements. Modern circuit breakers have a pivot shaft passing through all the single-pole units for driving the movable contacts of these units in synchronous rotation. The presence of this pivot axis brings some constraints to the configuration and structure of the circuit breaker. In the process that contacts of a direct current circuit breaker in the prior art are repelled due to short circuit, due to manufacturing errors, the spring force of each phase of contact is different, a certain phase of contact is repelled firstly, and the repelled contact can bear full-voltage short-circuit current electric arc, so that the breaking difficulty of the contact is increased.

SUMMERY OF THE UTILITY MODEL

The present invention is directed to overcome the above-mentioned drawbacks of the prior art, and provides a contact synchronization structure of a dc circuit breaker, which enables each phase of contact to be more synchronously detached during a short circuit of a dc circuit.

The purpose of the utility model can be realized through the following technical scheme:

the utility model provides a synchronous structure of direct current circuit breaker contact, includes the pivot, mechanism and several contact, the pivot includes bush and synchronizing shaft, and the bush is connected with the mechanism, several contact and synchronizing shaft fixed connection form an integral contact structure, drive all looks contacts synchronous motion together when arbitrary contact is repelled.

Furtherly still includes the torsional spring, the torsional spring sets up in the synchronizing shaft, torsional spring one end butt contact, other end butt bush, and torsional spring and bush cooperation set up in the single-phase unit that opens circuit in mechanism below.

Further, the torsion spring provides the bushing and the synchronizing shaft connected with the contact with opposite directions of movement tendency.

Furthermore, lower connecting rods are arranged on two sides of the mechanism, holes a are formed in the lower connecting rods, and holes b are formed in the bushings.

Further, the connecting rod further comprises a shaft, and the shaft is matched with the hole a and the hole b to connect the lower connecting rod and the bushing.

Furthermore, supports are arranged on two sides of the mechanism, and step surfaces are arranged on the synchronizing shafts.

Further, the arc surface at the bottom of the support is matched with the step surface in the rotating process of the mechanism.

Furthermore, the step surfaces are symmetrically arranged, the limiting bushings are centered, and the bushing limiting synchronous shafts are centered.

And the upper end of the bushing is provided with an arc groove, and the shape of the groove is matched with the outer contour of the synchronizing shaft.

Further, the bushings are symmetrically arranged on two sides in the mechanism.

Compared with the prior art, the utility model has the advantages of it is following:

(1) The contacts of all phases are connected into an integral structure, before the circuit breaker mechanism is tripped, the repelled contacts can drive the contacts of all phases to synchronously act together, the synchronism is high when the contacts of all phases are repelled, the voltage is equally divided, the voltage applied when each phase is broken is the same, and the arc extinguishing difficulty of the breakpoint of each phase is reduced.

(2) The contacts of each phase are connected into an integral structure, so that not only can assembly errors be eliminated, but also the final pressure of each contact can be the same.

(3) All the contacts are fixed on the synchronizing shaft, and the requirement of synchronous action of all the contacts can be met only by installing one torsion spring, so that the assembly process is simplified.

Drawings

FIG. 1 is a schematic view of the overall structure of the present invention;

FIG. 2 is a schematic view of the structure of the rotating shaft of the present invention;

FIG. 3 is a schematic view of the structure of the bushing of the present invention;

FIG. 4 is a cross-sectional view of the bushing and synchronizing shaft of the present invention;

fig. 5 is a schematic structural view of the synchronizing shaft of the present invention.

In the figure: 1. a rotating shaft; 12. a bushing; 13. a synchronizing shaft; 2. a mechanism; 21. a lower connecting rod; 22. a support; 3. a contact; 4. a torsion spring; 5. a shaft; 51. a hole b; 6. a step surface.

Detailed Description

The present invention will be described in detail with reference to the accompanying drawings and specific embodiments.

Examples

As shown in fig. 1, a synchronous structure of a direct current breaker contact comprises a rotating shaft 1, a mechanism 2 and a plurality of contacts 3, as shown in fig. 2, the rotating shaft 1 comprises a bushing 12 and a synchronizing shaft 13, the bushing 12 is symmetrically arranged on two sides inside the mechanism 2, the bushing 12 is connected with the mechanism 2, the plurality of contacts 3 are fixedly connected with the synchronizing shaft 13 to form an integral contact structure, when any contact 3 is repelled, all the contacts 3 in all phases are driven to synchronously act together, assembly errors can be eliminated, and the final pressures of the contacts can be the same. As shown in fig. 4, the synchronizing structure further includes a torsion spring 4, the torsion spring 4 is disposed in the synchronizing shaft 13, one end of the torsion spring 4 abuts against the contact 3, the other end of the torsion spring abuts against the bushing 12, the torsion spring 4 provides a movement trend in the opposite direction for the bushing 12 and the synchronizing shaft 13 connected to the contact 3, and the torsion spring 4 and the bushing 12 are disposed in the single-phase circuit breaking unit below the mechanism 2 in a matching manner.

As shown in fig. 3 and 4, the mechanism 2 is provided with lower links 21 on both sides, the lower links 21 are provided with holes a, the bushings 12 are provided with holes b51, and the shaft 5 is matched with the holes a and the holes b51 to connect the lower links 21 and the bushings 12. As shown in fig. 1, two sides of the mechanism 2 are provided with brackets 22, the synchronizing shaft 13 is provided with a step surface 6, an arc surface at the bottom of the bracket 22 is matched with the step surface 6 in the rotation process of the mechanism 2, the step surfaces 6 are symmetrically arranged, the limiting bushes 12 are centered, the limiting synchronizing shaft 13 of the bushes 12 is centered, the upper end of the bushes 12 is provided with an arc groove, and the shape of the arc groove is matched with the outer contour of the synchronizing shaft 3, so that the bushes 12 can be matched with the groove formed between the synchronizing shaft 13 and the step surface 6.

In the assembling process, be fixed in synchronizing shaft 13 with contact 3, successively pack into torsional spring 4, bush 12, mechanism 2's lower connecting rod 21, axle 5, the utility model discloses all be suitable for to heterogeneous moulded case circuit breaker, in this embodiment, use three-phase direct current moulded case circuit breaker as an example, only pack into torsional spring 4 in the unit that opens circuit in the circuit breaker and be used for producing torsion, produce the heavy current in the direct current return circuit, before circuit breaker mechanism 2 drops off, produce electronic repulsion between the sound contact, the contact 3 of repelling earlier can drive all looks contact 3 and move together synchronization, until the circuit breaker drops off, the epaxial bush 12 of pivot 1 just can be driven the rotation by lower connecting rod 21, has realized the synchronous repulsion of each looks contact 3.

To sum up, the utility model discloses a constitute an overall structure with each looks for the contact synchronizing shaft connection, realized that the synchronization of each looks contact is repulsive, the equipartition voltage makes every voltage that passes through the same, reduces the arc extinguishing degree of difficulty of every looks breakpoint.

Claims (10)

1. The utility model provides a synchronous structure of direct current circuit breaker contact, includes pivot (1), mechanism (2) and several contact (3), its characterized in that, pivot (1) includes bush (12) and synchronizing shaft (13), and bush (12) are connected with mechanism (2), several contact (3) and synchronizing shaft (13) fixed connection form an integral contact structure, drive all looks contact (3) synchronous motion together when arbitrary contact (3) are repulsed.

2. The synchronous structure of a direct current breaker contact according to claim 1, characterized by further comprising a torsion spring (4), wherein the torsion spring (4) is disposed in the synchronizing shaft (13), one end of the torsion spring (4) abuts against the contact (3), the other end abuts against the bushing (12), and the torsion spring (4) and the bushing (12) are cooperatively disposed in a single-phase breaking unit below the mechanism (2).

3. A synchronization structure of contacts of a direct current circuit breaker according to claim 2, characterized in that the torsion spring (4) provides the bushing (12) and the synchronization shaft (13) connected to the contacts (3) with opposite directions of movement tendency.

4. A synchronization structure for contacts of a direct current circuit breaker according to claim 1, characterized in that the mechanism (2) is provided with lower links (21) on both sides, the lower links (21) being provided with holes a and the bushings (12) being provided with holes b (51).

5. A synchronization structure for contacts of a direct current circuit breaker according to claim 4, characterized in that it further comprises a shaft (5), the shaft (5) cooperating with the holes a and b (51) to connect the lower link (21) and the bushing (12).

6. A synchronous structure of a direct current breaker contact according to claim 1, characterized in that brackets (22) are provided on both sides of the mechanism (2), and a step surface (6) is provided on the synchronizing shaft (13).

7. A synchronization structure for contacts of a direct current circuit breaker according to claim 6, characterized in that the circular arc surface at the bottom of the holder (22) cooperates with the step surface (6) during the rotation of the mechanism (2).

8. A synchronization structure of a DC breaker contact according to claim 6, characterized in that the step surfaces (6) are symmetrically arranged, the limit bushings (12) are centered, and the limit synchronizing shafts (13) of the bushings (12) are centered.

9. The synchronous structure of a direct current breaker contact according to claim 1, characterized in that the upper end of the bushing (12) is provided with a circular arc groove, and the shape of the groove is matched with the outer contour of the synchronous shaft (13).

10. A synchronization structure for contacts of a direct current circuit breaker according to claim 1, characterized in that said bushings (12) are symmetrically arranged on both sides inside the mechanism (2).

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