CN111029224A - Current-limiting automatic opening device - Google Patents

Abstract

The invention discloses a current-limiting automatic opening device which comprises an opening half shaft, a double-blade assembly and an elastic element, wherein the double-blade assembly comprises two double-blade current-limiting unlocking plates and two blades which act through the elastic element. The double blade adopts the integral type structure, the cost is reduced, reduce and make the assembly process, elastic element contacts with the double blade through the rotatable joint device that sets up circular recess on the double blade and constitute with circular recess assorted button head toper boss, it is askew to make elastic element can not press at the compression in-process, prevent elastic element position dislocation in the compression, the double blade is double-jaw design with the head that divides the floodgate semi-axis to contact, be favorable to reducing frictional force, more be favorable to the quick separating brake of mechanism.

Description

Current-limiting automatic opening device

Technical Field

The invention relates to the field of circuit breakers, in particular to a current-limiting automatic opening device.

Background

The breaking capacity of the circuit breaker is an important parameter of the performance index of the circuit breaker, and the breaking capacity depends on the breaking capacity of the breaking device to a great extent. According to the breaking test, when the breaker has short-circuit fault, the current can be instantly increased by more than 20 times to the normal value, and thus, strong extra electrodynamic force is generated between the moving contact and the static contact. In this case, the circuit breaker should be rapidly opened by the opening device, otherwise it would be easy to damage the internal mechanism of the circuit breaker.

Chinese patent CN99111495.7 discloses a circuit breaker and a current-limiting automatic opening device arranged in the circuit breaker. The current-limiting automatic opening device mainly comprises an opening pawl which is mainly composed of a pair of supporting flanges, a guide plate fixed to the supporting flanges, a limiting lever hinged with the supporting flanges and two compression springs installed between the guide plate and the limiting lever. The end of the restraining lever is provided with a nose which cooperates with the latch. When the latch is unlocked from the nose of the end of the limit lever, the circuit breaker can be quickly opened. The length of the unlatching time between the latch and the nose is controlled by the degree of compression of the two compression springs.

However, the automatic opening device in the above system has certain disadvantages: the limiting lever rotates around the rotating shaft in the brake separating process and does not vertically move up and down, so that the spring is not linearly compressed in the compression process, and due to the position deviation of the spring, the function failure is easily caused by long-time work, and the breaking capacity of the circuit breaker is reduced.

Disclosure of Invention

The invention aims to overcome the defects of the prior art and provide a current-limiting automatic opening device.

Specifically, the technical scheme adopted by the invention is as follows: a current-limiting automatic opening device comprises an opening half shaft, a double-blade component and an elastic element; the double-blade assembly comprises two double-blade current-limiting unlocking sheets and double blades, and the double blades are rotatably arranged between the two double-blade current-limiting unlocking sheets through a double-blade assembly rotating shaft and limited by a double-blade limiting shaft; the double-knife current-limiting unlocking sheet and the double-knife blade act through an elastic element, and the elastic element is in contact with the double-knife blade through a rotatable joint device.

Further, the double blade is of an integrated structure.

Further, the elastic element is a current limiting spring.

Further, the rotatable joint device is a circular groove arranged on the double blades and a round-head conical boss matched with the circular groove.

Furthermore, a current-limiting spring fixing device is arranged on the double-blade current-limiting unlocking sheet.

Further, the current limiting spring fixing device is a current limiting spring mounting seat.

Further, the current-limiting spring mounting base is provided with a cylindrical hole, one end of the current-limiting spring is mounted in the cylindrical hole, and the other end of the current-limiting spring is mounted on the round-head conical boss.

Further, the current-limiting spring, the circular groove, the round-head conical boss and the current-limiting spring mounting seat are 2 in pair.

Furthermore, the head part of the double blade contacting with the opening half shaft is a double clamping head.

Correspondingly, the circuit breaker adopts the current-limiting automatic opening device.

The invention has the following beneficial effects:

1. the double blades adopt an integrated structure, so that the cost is reduced, and the manufacturing and assembling processes are reduced.

2. The elastic element is contacted with the double blades by adopting the joint device, so that the elastic element cannot be pressed askew in the compression process, and the position of the elastic element is prevented from being dislocated in the compression process.

3. The head of the double blade contacting with the opening half shaft is a double clamping head and is divided into two parts, which is beneficial to reducing friction force and is more beneficial to quick opening of the mechanism.

Drawings

Fig. 1 is an exploded view of the double-blade assembly of the present invention.

Fig. 2 is a schematic view of a double blade of the present invention.

Fig. 3 is a schematic view of a double blade according to the present invention at a further angle.

FIG. 4 is a schematic view of a rounded nose cone boss of the present invention.

Fig. 5 is a top view of a current limiting spring mount of the present invention.

Fig. 6 is a side cross-sectional view of a current limiting spring mount of the present invention.

Fig. 7 is a perspective view of a current limiting spring mount of the present invention.

Fig. 8 is a schematic diagram of a closing state of the disconnecting device according to the present invention.

FIG. 9 is a schematic diagram of the opening state of the opening device of the present invention.

Reference numbers in the figures: 1-opening half shaft; 2-double-knife current-limiting unlocking sheet; 3-double blade; 4-double blade limit shaft; 5, rotating a double-cutter assembly shaft; 6-a current limiting spring; 7, a circular groove; 8-round head conical boss; 9-current limiting spring mounting seat; 10-double chuck.

Detailed Description

The invention is described in further detail below with reference to the accompanying drawings and detailed description, in order to facilitate the understanding and implementation of the invention by those skilled in the art.

The embodiment of the invention discloses a current-limiting automatic opening device, which is used in a matched circuit breaker to realize the quick opening of the circuit breaker.

As shown in fig. 1, 8 and 9, the current-limiting automatic opening device of the present embodiment includes an opening half shaft 1, a double-blade current-limiting unlocking plate 2, a double-blade 3, and the like. Wherein the double-blade current-limiting unlocking sheet 2 has two pieces, and the double-blade 3 is of an integrated structure, so that the cost can be reduced, and the manufacturing and assembling processes can be reduced. The double-knife assembly rotating shaft 5 is arranged on the two double-knife current-limiting unlocking sheets 2, so that a double-knife assembly is formed. The double-blade 3 can rotate in the two double-blade current-limiting unlocking sheets 2 by virtue of the double-blade assembly rotating shaft 5, but is limited by the double-blade limiting shaft 4 arranged between the two double-blade current-limiting unlocking sheets 2.

A current-limiting spring 6 is also arranged between the two double-knife current-limiting unlocking sheets 2. In this embodiment, the number of the current limiting springs 6 is two. The current-limiting spring mounting seat 9 is mounted between the two double-blade current-limiting unlocking sheets 2, as shown in fig. 5, 6 and 7, is a cuboid, and two cylindrical holes are formed in the seat. The bottom end of each current-limiting spring 6 is arranged in each cylindrical hole of the current-limiting spring mounting seat 9, the other end of each current-limiting spring is sleeved below one round-head conical boss 8, and the round-head conical boss 8 is in the shape shown in fig. 4. Correspondingly, two circular grooves 7 are arranged on the double blade 3 and matched with the round-head conical boss 8, as shown in figure 2. Therefore, if the current-limiting spring 6 is compressed, the round head part of the round head conical boss 8 can rotate in the round groove 7, and the current-limiting spring 6 is prevented from being misplaced in the compression process, so that the current-limiting spring 6 cannot be pressed askew in the compression process.

As shown in fig. 3, the head of the double blade 3 contacting the opening half shaft 1 is divided into two parts to form a double chuck 10. Thus, the friction force is reduced, and the mechanism is more favorable for rapid brake opening.

As shown in fig. 6, when a short-circuit fault does not occur in the line where the circuit breaker is located, the mechanism is switched on, and at this time, under the action of the current limiting spring 6, the double clamping heads 10 of the double blades 3 are in contact with the opening half shaft 1, and are in a locked state. If the short-circuit fault appears in the circuit, short-circuit current is generated in the circuit, under the action of the short-circuit current, strong electric repulsion force is generated between the moving contact and the static contact of the circuit breaker, the acting force is finally transmitted to the current-limiting automatic opening device, the current-limiting spring 6 can be compressed by the extra acting force at the moment, when the current-limiting spring 6 is compressed to a certain state, the double-blade current-limiting unlocking plate 2 is driven to rotate, unlocking is conducted between the double clamping heads 10 of the opening half shaft 1 and the double blades 3, the circuit breaker can be quickly opened at the moment, and the short-circuit fault current is cut.

The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, several modifications and decorations can be made without departing from the spirit of the present invention, and these modifications and decorations should also be regarded as being within the scope of the present invention.

Claims (10)

1. A current-limiting automatic opening device comprises an opening half shaft (1), a double-blade component and an elastic element; the double-knife assembly comprises two double-knife current-limiting unlocking sheets (2) and double-knife blades (3), wherein the double-knife blades (3) are rotatably arranged between the two double-knife current-limiting unlocking sheets (2) through a double-knife assembly rotating shaft (5) and limited by a double-knife limiting shaft (4); the double-blade current-limiting unlocking sheet (2) and the double-blade (3) act through an elastic element, and the double-blade current-limiting unlocking sheet is characterized in that:

the elastic element is in contact with the double blade (3) via a rotatable joint device.

2. The current-limiting automatic opening device according to claim 1, wherein: the double blades (3) are of an integrated structure.

3. A current-limiting automatic opening device according to claim 1 or 2, characterized in that: the elastic element is a current limiting spring (6).

4. A current-limiting automatic opening device according to claim 3, characterized in that: the rotatable joint device comprises a circular groove (7) arranged on the double blades (3) and a round-head conical boss (8) matched with the circular groove (7).

5. The current-limiting automatic opening device according to claim 4, wherein: the double-knife current-limiting unlocking sheet (2) is provided with a current-limiting spring fixing device.

6. The current-limiting automatic opening device according to claim 5, wherein: the fixing device of the current-limiting spring is a current-limiting spring mounting seat (9).

7. The current-limiting automatic opening device according to claim 6, wherein: the current-limiting spring mounting seat (9) is provided with a cylindrical hole, one end of the current-limiting spring (6) is mounted in the cylindrical hole, and the other end of the current-limiting spring is mounted on the round-head conical boss (8).

8. The current-limiting automatic opening device according to claim 7, wherein: the current-limiting spring (6), the round groove (7), the round-head conical boss (8) and the current-limiting spring mounting seat (9) are 2 in pair.

9. A current-limiting automatic opening device according to any one of claims 1 to 8, wherein: the head of the double blade (3) contacting with the opening half shaft (1) is a double chuck (10).

10. A circuit breaker, characterized by: a current-limiting automatic opening device according to claims 1-9.

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