CN221304556U - Moving contact assembly for circuit breaker and circuit breaker - Google Patents

Abstract

Embodiments of the present disclosure provide a moving contact assembly for a circuit breaker and a circuit breaker including the same, the moving contact assembly including: the bracket comprises an inner space, and an abutting piece is arranged on the side wall of the inner space; the movable contact comprises a movable contact arm penetrating through the inner space and movable contacts positioned at two ends of the movable contact arm, the movable contact is suitable for rotating around a rotation axis between a switching-off position, a switching-on position and a clamping position, the movable contact is in contact with a fixed contact of the circuit breaker in the switching-on position, and the movable contact is separated from the fixed contact in the switching-off position and the clamping position; and a plurality of torsion springs respectively disposed between the movable contact arm and the side wall of the inner space, one end of each torsion spring facing the movable contact arm being fixed to the movable contact arm and an abutting portion being provided on one end of the side wall adjacent to the inner space, the abutting portion abutting against the abutting member to exert an elastic force toward the abutting member.

Description

Moving contact assembly for circuit breaker and circuit breaker

Technical Field

Embodiments of the present disclosure relate to the field of electrical devices, and more particularly, to a moving contact assembly for a circuit breaker and a circuit breaker including the same.

Background

The moving contact in the existing molded case circuit breaker is generally equipped with a double tension spring structure. The force value of such a double tension spring structure design is usually already close to the yield limit of the material, and in actual operation, the lap joint part of the tension spring and the movable contact is at risk of breaking. The normal operation of the circuit breaker can be affected once the tension spring breaks. In addition, the double tension spring structure has higher requirements on raw materials and processing technology of the spring, thereby leading to higher production cost. Therefore, an optimal design is required.

Disclosure of utility model

An object of the present disclosure is to provide a moving contact assembly for a circuit breaker and a circuit breaker including the same, to at least partially solve the above-mentioned problems.

In a first aspect of the present disclosure, there is provided a moving contact assembly for a circuit breaker, the moving contact assembly comprising: the support comprises an inner space, and an abutting piece is arranged on the side wall of the inner space; the movable contact comprises a movable contact arm penetrating through the inner space and movable contacts positioned at two ends of the movable contact arm, the movable contact is suitable for rotating around a rotation axis between a switching-off position, a switching-on position and a clamping position, the movable contact is in contact with a fixed contact of the circuit breaker in the switching-on position, and the movable contact is separated from the fixed contact in the switching-off position and the clamping position; and a plurality of torsion springs respectively disposed between the moving contact arm and the side wall of the inner space, one end of each torsion spring facing the moving contact arm being fixed to the moving contact arm and being provided with an abutting portion on one end of the side wall adjacent to the inner space, the abutting portion abutting against the abutting piece to apply an elastic force toward the abutting piece.

According to the moving contact assembly of the embodiment of the disclosure, the plurality of torsion springs arranged on the contact arm respectively apply elastic force to the abutting pieces on the support, so that the moving contact and the support are maintained at the relatively balanced position, the moving contact can be more fully contacted with the corresponding fixed contact when in the closing position, and the moving contact can be repelled by a larger angle relative to the support and cannot fall off when in the clamping position.

In some embodiments, opposite sides of the side wall of the movable contact arm facing the inner space are respectively provided with a pair of positioning pieces arranged symmetrically with respect to the center of the rotation axis. In such an embodiment, the positioning members are arranged centrally symmetrically about the rotational axis of the contact arm, so that the spring forces exerted by torsion springs mounted on the positioning members towards the carrier can be balanced against each other.

In some embodiments, each of the plurality of torsion springs is formed with a through hole into which the positioning member can extend, and each of the plurality of torsion springs is respectively sleeved on the corresponding positioning member through the through hole. In such an embodiment, the positioning member can reliably restrict the plurality of torsion springs to a predetermined position with respect to the movable contact arm.

In some embodiments, an end of each of the plurality of torsion springs facing the moving contact arm is provided with a fixing portion fixed to end surfaces of opposite sides of a side wall of the moving contact arm facing the inner space to restrict the corresponding torsion spring to a predetermined position with respect to the moving contact arm. In such an embodiment, the fixing portion can reliably fix the plurality of torsion springs to the movable contact arm.

In some embodiments, a fixing member is provided in each through hole, the fixing member being fixed to one end of the positioning member adjacent to the side wall of the inner space to restrict the corresponding torsion spring to a predetermined position with respect to the movable contact arm. In such an embodiment, the fixing portion can reliably fix the plurality of torsion springs to the positioning member.

In some embodiments, each of the plurality of torsion springs is provided on opposite sides of a side wall of the movable contact arm facing the inner space and a connection portion is provided between each two torsion springs adjacent to each other, the connection portion being fixed to an end face of the movable contact arm perpendicular to the side wall of the inner space to restrict the corresponding torsion spring to a predetermined position with respect to the movable contact arm. In such an embodiment, the connecting portion can reliably fix the plurality of torsion springs to the movable contact arm.

In some embodiments, the plurality of torsion springs includes four torsion springs, two of the four torsion springs being disposed on one side of the moving contact arm, and another two of the four torsion springs being disposed on the other side of the moving contact arm. In such an embodiment, the spring force applied by the four torsion springs to the abutment can place the bracket in a force balanced state.

In a second aspect of the present disclosure, a circuit breaker is provided comprising a moving contact assembly according to the first aspect of the present disclosure.

It should be understood that what is described in this section of content is not intended to limit key features or essential features of the embodiments of the present disclosure nor is it intended to limit the scope of the present disclosure. Other features of the present disclosure will become apparent from the following description.

Drawings

The above and other features, advantages and aspects of embodiments of the present disclosure will become more apparent by reference to the following detailed description when taken in conjunction with the accompanying drawings. In the drawings, wherein like or similar reference numerals denote like or similar elements, in which:

fig. 1 illustrates a schematic structural view of a moving contact assembly according to one embodiment of the present disclosure;

FIG. 2 illustrates an exploded schematic view of a moving contact assembly according to one embodiment of the present disclosure;

Fig. 3 shows an exploded schematic view of a moving contact assembly according to another embodiment of the present disclosure;

Fig. 4 shows an exploded schematic view of a moving contact assembly according to another embodiment of the present disclosure;

fig. 5 illustrates a schematic cross-sectional view of the moving contact assembly shown in fig. 2 in a closing initial position in accordance with the present disclosure;

Fig. 6 illustrates a schematic cross-sectional view of the moving contact assembly shown in fig. 2 in a closing end position in accordance with the present disclosure;

FIG. 7 illustrates a schematic cross-sectional view of the moving contact assembly of FIG. 2 in a breaking position according to the present disclosure; and

Fig. 8 illustrates a schematic cross-sectional view of the moving contact assembly shown in fig. 2 in a latched position in accordance with the present disclosure.

Reference numerals illustrate:

1 moving contact assembly 2 static contacts

10 Moving contact 11 moving contact arm

12 Moving contact 20 support

30 Torsional spring 111 locating piece

200 Inner space 201 abutment

301 Abutting portion 302 fixing portion

303 Fixing piece 304 connecting part

300 Through hole

Detailed Description

Preferred embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While the preferred embodiments of the present disclosure are illustrated in the drawings, it should be understood that the present disclosure may be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

The term "comprising" and variations thereof as used herein means open ended, i.e., "including but not limited to. The term "or" means "and/or" unless specifically stated otherwise. The term "based on" means "based at least in part on". The terms "one example embodiment" and "one embodiment" mean "at least one example embodiment. The term "another embodiment" means "at least one additional embodiment". The terms "first," "second," and the like, may refer to different or the same object.

As described hereinabove, the moving contact in the conventional circuit breaker is generally equipped with a double tension spring structure. The force value of the double-tension spring structure is usually close to the yield limit of the material, and in actual operation, the tension spring is at risk of breaking at the lap joint part with the moving contact, and the normal operation of the circuit breaker can be influenced once the tension spring breaks. In addition, the double tension spring structure has higher requirements on raw materials and processing technology of the spring and higher production cost. Therefore, an optimal design is required. Embodiments of the present disclosure provide a moving contact assembly for a circuit breaker and a circuit breaker including the same, in which a plurality of torsion springs are provided on a contact arm to apply an elastic force toward an abutting piece on a bracket so that the moving contact and the bracket are maintained at a relatively balanced position with each other, and can be brought into contact with a corresponding stationary contact more sufficiently at a closing position, and are repelled by a larger angle with respect to the bracket at a blocking position without falling. Hereinafter, the principles of the present disclosure will be described with reference to fig. 1 to 8.

Fig. 1 illustrates a schematic structural view of a moving contact assembly according to one embodiment of the present disclosure. As shown in fig. 1, the faulty moving contact assembly 1 described herein generally includes a moving contact 10, a bracket 20, and a plurality of torsion springs 30. The bracket 20 is formed with an inner space 200, and an abutment 201 is provided on a sidewall of the inner space 200. The moving contact 10 includes a moving contact arm 11. The movable contact arm 11 is disposed in the inner space 200. An end of each torsion spring 30 of the plurality of torsion springs 30 facing the moving contact arm 11 is fixed to the moving contact arm 11 and an abutting portion 301 is provided on an end of a side wall adjacent to the inner space 200, the abutting portion 301 abutting against the abutting piece 201 to apply an elastic force toward the abutting piece 201. Further, both ends of the movable contact arm 11 are provided with movable contacts 12. The moving contact 10 is adapted to rotate about a rotational axis between a switching-off position, a switching-on position and a blocking position. In the closing position, the movable contact 12 is in contact with the stationary contact 2 of the circuit breaker. In the opening position and the locking position, the movable contact 12 is separated from the stationary contact 2.

In one embodiment, the abutment 201 is circular-axis shaped and extends in a direction away from the side wall of the interior space 200, so that the abutment 301 can reliably abut against the side wall of the abutment 201 all the way during rotation of the moving contact 10. It should be understood that other types of abutments to achieve the above functions will occur to those of ordinary skill in the art based on the teachings provided in this disclosure, and such implementations are within the scope of this disclosure.

Fig. 2 illustrates an exploded schematic view of a moving contact assembly according to one embodiment of the present disclosure. In one embodiment, as shown in fig. 1 and 2, the plurality of torsion springs 30 includes four torsion springs 30. Two torsion springs 30 of the four torsion springs 30 are provided at one side of the moving contact arm 11, and the other two torsion springs 30 of the four torsion springs 30 are provided at the other side of the moving contact arm 11. Opposite sides of the side wall of the movable contact arm 11 facing the inner space 200 are provided with a pair of positioning pieces 111, respectively, arranged symmetrically with respect to the center of the rotation axis. Each torsion spring 30 of the plurality of torsion springs 30 is formed with a through hole 300 into which the positioning member 111 is inserted. Each torsion spring 30 of the plurality of torsion springs 30 is respectively sleeved on the corresponding positioning piece 111 through the through hole 300. The positioning pieces 111 can restrict the respective torsion springs 30 to predetermined positions with respect to the movable contact arm 11 so that the elastic forces exerted by the respective torsion springs 30 toward the abutting pieces 201 can be balanced with each other.

In one embodiment, as shown in fig. 1 and 2, an end of each torsion spring 30 of the plurality of torsion springs 30 facing the moving contact arm 11 is provided with a fixing portion 302. The fixing portions 302 are fixed to end surfaces of opposite sides of the side wall of the movable contact arm 11 facing the inner space 200 to further restrict the corresponding torsion springs 30 to predetermined positions with respect to the movable contact arm 11. In one embodiment, as shown in fig. 1 and 2, the fixing portion 302 is a leg of each torsion spring 30 extending toward one end of the movable contact arm 11, the leg extending in the tangential direction of the through hole 300. The fixing portion 302 may be fixed to end surfaces of opposite sides of the side wall of the movable contact arm 11 facing the inner space 200 by a connection means such as welding to serve as a fixing end of the torsion spring 30. It should be understood that based on the teachings provided in this disclosure, one of ordinary skill in the art will recognize that other types of fixtures may accomplish the above-described functions, and such implementations fall within the scope of this disclosure.

Fig. 3 shows an exploded schematic view of a moving contact assembly according to another embodiment of the present disclosure. Fig. 4 shows an exploded schematic view of a moving contact assembly according to another embodiment of the present disclosure. The structure of the moving contact assembly shown in fig. 3 and 4 is similar to that described in connection with fig. 1 and 2, except that the torsion spring 30 adopts a different structural form. Only the differences between the three will be described below, and the same parts will not be described again.

In one embodiment, as shown in fig. 3, a fixing member 303 is provided in the through hole 300 of each torsion spring 30. The fixing member 303 is fixed to one end of the positioning member 111 adjacent to the side wall of the inner space 200 to restrict the corresponding torsion spring 30 to a predetermined position with respect to the movable contact arm 11. In one embodiment, as shown in fig. 3, the fixing member 303 is a convex portion extending from the inside of the through hole 300, the convex portion extending toward a direction near the center of the through hole 300. The fixing member 303 may be fixed by welding to the end surface of the positioning member 111. It should be understood that based on the teachings provided in this disclosure, one of ordinary skill in the art will recognize other types of fasteners to accomplish the above-described functions, all falling within the scope of this disclosure.

In one embodiment, as shown in fig. 4, each torsion spring 30 of the plurality of torsion springs 30 is provided on opposite sides of a side wall of the movable contact arm 11 facing the inner space 200, respectively, and a connection portion 304 is provided between each two torsion springs 30 adjacent to each other. The connection portion 304 is fixed to an end surface of the moving contact arm 11 perpendicular to the side wall of the inner space 200 to restrict the corresponding torsion spring 30 to a predetermined position with respect to the moving contact arm 11. In one embodiment, as shown in fig. 4, the connection portion 304 is a connection portion between two torsion springs 30 provided on opposite sides of the side wall of the movable contact arm 11 facing the inner space 200 and adjacent to each other, and may be fixed to an end surface of the movable contact arm 11 perpendicular to the side wall of the inner space 200 by a connection manner such as welding. It should be understood that based on the teachings provided in this disclosure, one of ordinary skill in the art may contemplate other types of connections to perform the functions described above, all falling within the scope of the present disclosure.

The moving contact assembly shown in fig. 3 and 4 operates in substantially the same manner as the moving contact assembly described in connection with fig. 1 and 2. The working principle of the movable contact assembly will be described in detail below by taking the embodiment shown in fig. 2 as an example.

The closing position of the moving contact 10 is further divided into a closing initial position and a closing end position. Fig. 5 illustrates a schematic cross-sectional view of the moving contact assembly shown in fig. 2 in a closing initial position according to the present disclosure. In one embodiment, as shown in fig. 5, in the case of the moving contact 10 in the closing initial position, the pair of torsion springs 30 symmetrically arranged with the rotation axis center apply the elastic force to the abutting piece 201 in the direction passing through the center of the abutting piece 201 and the magnitudes of the forces are equal, the moving contact arm 11 and the bracket 20 are in the balanced state, and the moving contact 12 is in contact with the stationary contact 2.

Fig. 6 illustrates a schematic cross-sectional view of the moving contact assembly shown in fig. 2 in a closing end position according to the present disclosure. In one embodiment, as shown in fig. 6, in the case that the moving contact 10 is at the closing end position, the bracket 20 is driven counterclockwise to the illustrated position by a switch link (not shown) connected to the circuit breaker, the elastic force applied to the abutting piece 201 by the pair of torsion springs 30 symmetrically arranged with the center of rotation axis will form a moment in the clockwise direction, and at this time, the reaction force applied by the abutting piece 201 to the torsion springs 30 will cause the moving contact arm 11 to receive a moment in the counterclockwise direction, so that the moving contact 12 and the stationary contact 2 can be more fully contacted, and the contact stability is improved.

Fig. 7 illustrates a schematic cross-sectional view of the moving contact assembly shown in fig. 2 in a breaking position according to the present disclosure. In one embodiment, as shown in fig. 7, in the case of the moving contact 10 in the open position, the pair of torsion springs 30 symmetrically arranged with the rotation axis center apply the elastic force to the abutting piece 201 in the direction passing through the center of the abutting piece 201 and the magnitudes of the forces are equal, the moving contact arm 11 and the bracket 20 are in the balanced state, and the moving contact 12 is separated from the stationary contact 2.

Fig. 8 illustrates a schematic cross-sectional view of the moving contact assembly shown in fig. 2 in a latched position in accordance with the present disclosure. In one embodiment, as shown in fig. 8, the movable contact 12 is repelled away from the stationary contact 2 by the lorentz force, i.e. the movable contact arm 11 is driven clockwise. In the case where the movable contact arm 11 is driven to the illustrated position, the movable contact 10 is in the locked position, the elastic force applied to the abutting piece 201 by the pair of torsion springs 30 arranged symmetrically about the rotation axis center forms a moment in the counterclockwise direction, and the reaction force applied to the abutting piece 201 toward the torsion springs 30 causes the movable contact arm 11 to receive a moment in the clockwise direction, so that the movable contact 12 can be separated from the stationary contact 2 more quickly, thereby realizing that the movable contact 10 is repelled by a larger angle with respect to the bracket 20. In addition, the spring force continuously applied to the movable contact arm 11 by the torsion spring 30 can also enable the movable contact 12 to stay at the clamping position stably after being repelled, and not fall anticlockwise to contact the fixed contact 2 again. By using the abutting portions 301 of different structural shapes, it is possible to achieve stable stay at different angles with respect to the holder 20 after the movable contact 12 is repelled. The size of the angle at which the movable contact 12 can rest stably with respect to the bracket 20 in the locked position is selected according to the actual operating requirements of the circuit breaker.

According to the movable contact assembly disclosed by the embodiment of the disclosure, the torsion spring is adopted to replace the traditional double tension spring design, so that the abrasion between the springs and the contacts and the risk of collision fracture between the springs are avoided. The number of parts of the moving contact assembly is reduced, and the material cost and the assembly cost of the parts are reduced. The torsion spring realizes the moving contact locking, the mechanical structure is simpler, the friction loss is small, and the opening distance of the moving contact locking position relative to the support can be greatly increased, so that the circuit breaker is suitable for the scene of high voltage and high current.

The foregoing description of the embodiments of the present disclosure has been presented for purposes of illustration and description, and is not intended to be exhaustive or limited to the embodiments disclosed. Many modifications and variations will be apparent to those of ordinary skill in the art without departing from the scope and spirit of the various embodiments described. The terminology used herein was chosen in order to best explain the principles of the embodiments, the practical application, or the technical improvement in the marketplace, or to enable others of ordinary skill in the art to understand the embodiments disclosed herein.

Claims (8)

1. A moving contact assembly (1) for a circuit breaker, characterized in that the moving contact assembly (1) comprises:

A bracket (20), the bracket (20) comprising an inner space (200), an abutment (201) being provided on a side wall of the inner space (200);

A moving contact (10) comprising a moving contact arm (11) penetrating through the inner space (200) and moving contacts (12) positioned at two ends of the moving contact arm (11), wherein the moving contact (10) is suitable for rotating around a rotation axis between a switching-off position, a switching-on position and a clamping position, the moving contacts (12) are in contact with a fixed contact (2) of the circuit breaker in the switching-on position, and the moving contacts (12) are separated from the fixed contact (2) in the switching-off position and the clamping position; and

A plurality of torsion springs (30) are respectively arranged between the movable contact arm (11) and the side wall of the inner space (200), one end of each torsion spring (30) facing the movable contact arm (11) is fixed to the movable contact arm (11) and an abutting portion (301) is arranged on one end of the side wall adjacent to the inner space (200), and the abutting portion (301) abuts against the abutting piece (201) to exert elastic force towards the abutting piece (201).

2. The moving contact assembly (1) according to claim 1, characterized in that opposite sides of the side wall of the moving contact arm (11) facing the inner space (200) are provided with pairs of positioning members (111) arranged symmetrically with respect to the center of the rotation axis, respectively.

3. The movable contact assembly (1) according to claim 2, wherein each torsion spring (30) of the plurality of torsion springs (30) is formed with a through hole (300) into which the positioning member (111) can extend, and each torsion spring (30) of the plurality of torsion springs (30) is respectively sleeved on the corresponding positioning member (111) through the through hole (300).

4. A moving contact assembly (1) according to claim 3, characterized in that an end of each torsion spring (30) of the plurality of torsion springs (30) facing the moving contact arm (11) is provided with a fixing portion (302), the fixing portion (302) being fixed to end surfaces of opposite sides of a side wall of the moving contact arm (11) facing the inner space (200) to restrict the corresponding torsion spring (30) to a predetermined position with respect to the moving contact arm (11).

5. A moving contact assembly (1) according to claim 3, characterized in that a fixing member (303) is provided in each through hole (300), the fixing member (303) being fixed to one end of the positioning member (111) adjacent to the side wall of the inner space (200) to restrict the corresponding torsion spring (30) to a predetermined position with respect to the moving contact arm (11).

6. A moving contact assembly (1) according to claim 3, wherein each torsion spring (30) of the plurality of torsion springs (30) is provided on opposite sides of a side wall of the moving contact arm (11) facing the inner space (200) and a connecting portion (304) is provided between each two torsion springs (30) adjacent to each other, the connecting portion (304) being fixed to an end surface of the moving contact arm (11) perpendicular to the side wall of the inner space (200) to restrict the corresponding torsion spring (30) to a predetermined position with respect to the moving contact arm (11).

7. The moving contact assembly (1) according to any one of claims 1 to 6, wherein the plurality of torsion springs (30) comprises four torsion springs (30), two torsion springs (30) of the four torsion springs (30) being provided on one side of the moving contact arm (11), and the other two torsion springs (30) of the four torsion springs (30) being provided on the other side of the moving contact arm (11).

8. Circuit breaker, characterized in that it comprises a moving contact assembly (1) according to any one of claims 1-7.