Residual current protection circuit breaker with backup protection mechanism

Abstract

The utility model relates to a residual current protection circuit breaker with a backup protection mechanism, which comprises a base, a middle cover, a surface cover, an operating mechanism, an automatic reclosing mechanism, three groups of contact modules and a mutual inductor module, one end of an outgoing line static contact of each contact module is provided with three conductive parts extending out of the contact box, the three conductive parts are respectively provided with three backup protection mechanisms matched with a draw bar of the operating mechanism, each backup protection mechanism comprises a magnet yoke, a support, an armature and a torsion spring, the support is respectively provided with two limiting arms abutting against one end of the armature, and the two limiting arms are respectively provided with a spring. A trigger arm is arranged at the position, corresponding to the position between the two limiting arms, of one end of the armature, acts along with the armature and abuts against the traction rod, and linkage matching of the traction rod and the armature is formed. The utility model has the advantages of simple structure, stable and reliable performance, good insulating property, low temperature rise, high assembly efficiency and small volume.

Description

Technical Field

[0001] The utility model relates to the technical field of circuit breakers, in particular to a residual current protection circuit breaker with a backup protection mechanism. Background Art

[0002] A circuit breaker is a distribution electrical appliance used in a power grid, which can connect, carry and break the current under normal circuit conditions, and can also connect, carry for a certain time and break the current under specified abnormal conditions (such as overload, short circuit, leakage, undervoltage and single-phase ground fault). With the development of the power industry, the operating mechanism of molded case circuit breakers has gradually become the mainstream of current development, and the design is developing towards miniaturization and intelligence. The automatic reclosing mechanism is a special accessory for molded case circuit breakers. After being combined with the circuit breaker, it can remotely electrically close, disconnect and reclutch the circuit breaker to realize the centralized and automatic control of the power transmission and distribution network. The structural design of the backup protection mechanism of the existing reclosing residual current protection circuit breaker is unreasonable. This backup protection mechanism occupies a relatively large internal space of the reclosing residual current protection circuit breaker, and the internal structure of the reclosing residual current protection circuit breaker cannot be integrated modularly, so modular assembly cannot be achieved, the assembly efficiency is low, and the production cost is high. Moreover, the exhaust channel of the reclosing residual current protection circuit breaker is not separated from the conductive copper bar, and the insulation performance is poor. In addition, the reclosing residual current protection circuit breaker also has the defects of complex structure, unreliable performance and high temperature rise. Summary of the Invention

[0003] The purpose of the utility model is to overcome the defects of the prior art and provide a residual current protection circuit breaker with a backup protection mechanism, which has the advantages of simple structure, stable and reliable performance, good insulation performance, low temperature rise, high assembly efficiency and small volume.

[0004] To achieve the above-mentioned purpose, the utility model adopts a residual current protection circuit breaker with a backup protection mechanism, including a base, a middle cover arranged on the base, a surface cover arranged on the middle cover, an operating mechanism arranged in the base, an automatic reclosing mechanism arranged in the middle cover and used to drive the operating mechanism to perform opening and closing actions, three groups of contact modules and a transformer module respectively arranged in the base and linked with the operating mechanism, wherein the contact module includes a contact box arranged in the base, a moving contact frame rotatably arranged in the contact box and linked with the operating mechanism, a moving contact arranged on the moving contact frame, an incoming line static contact arranged in the contact box and matched with the moving contact, and a contact module arranged in the contact box and linked with the moving contact. The three groups of contact modules have three conductive parts extending outside the contact box at one end, and the three conductive parts are respectively provided with three backup protection mechanisms that cooperate with the traction rod of the operating mechanism. The backup protection mechanism includes a yoke arranged on the conductive part, a bracket arranged on the yoke, an armature rotating on the bracket and cooperating with the yoke, and a torsion spring arranged between the bracket and the armature. The bracket is respectively provided with two limit arms that abut against one end of the armature, and a trigger arm is arranged between the two corresponding limit arms on one end of the armature. The trigger arm moves with the armature and abuts against the traction rod, and constitutes a linkage cooperation between the traction rod and the armature.

[0005] The beneficial effects of the above structure are: the contact module adopts a modular structural design, which is conducive to the modular assembly of the reclosing residual current protection circuit breaker, and the assembly efficiency is higher. The three contact modules are independently arranged in the base, and the phase-to-phase insulation performance is better. The outgoing static contact has a conductive part with an integrated lead-out structure, which has better conductivity and lower temperature rise. The backup protection mechanism is designed on the conductive part. The structural design is more compact, the backup protection mechanism occupies less space, and it is convenient to assemble the conductive part and the backup protection mechanism, and the assembly is more convenient. Therefore, the residual current protection circuit breaker with a backup protection mechanism has the advantages of simple structure, stable and reliable performance, good insulation performance, low temperature rise, high assembly efficiency and small size.

[0006] In particular, insulating support covers are provided at the positions corresponding to the three conductive parts in the base, the insulating support covers are separated between the three conductive parts and the base, three exhaust channels are respectively formed between the insulating support cover and the base at the positions corresponding to the three groups of contact modules, and exhaust ports connected to the three exhaust channels are provided on the contact boxes of the three groups of contact modules. The exhaust channels can quickly discharge the high-pressure exhaust gas in the contact box, which is beneficial to improving the arc extinguishing performance of the contact module and extending the service life of the contact module.

[0007] Particularly, exhaust guiding grooves are respectively arranged inside the insulating support cover and are matched with the contact boxes of the three groups of contact modules. Clamping convex rings are arranged on the contact boxes of the three groups of contact modules corresponding to the exhaust holes. Buckling grooves matched with the clamping convex rings are arranged inside the exhaust guiding grooves. The clamping convex rings are clamped in the buckling grooves, and the contact boxes of the three groups of contact modules are clamped and matched with the insulating support cover. The insulating support cover and the contact box are assembled by means of clamping fit, which is convenient for the assembly of the insulating support cover and the contact box, and can ensure that the high-pressure gas inside the contact box quickly enters the exhaust guiding grooves, thus being beneficial to improving the working reliability of the contact module.

[0008] Particularly, the basic shape of the cross-section of the yoke is U-shaped. The conductive part is inserted into the groove body of the yoke. Suction inclined surfaces matched with the armature are respectively arranged on both sides of the groove body of the yoke corresponding to the yoke. The yoke is designed with a U-shaped structure, and the yoke is provided with suction inclined surfaces matched with the armature, which can increase the suction area between the yoke and the armature, thus ensuring that the yoke and the armature can be reliably sucked together, and being beneficial to improving the working reliability of the backup protection mechanism.

[0009] Particularly, a driving inclined surface matched with the traction rod is arranged on one side of the trigger arm, and an arc-shaped convex part matched with the driving inclined surface is arranged on one side of the traction rod. The driving inclined surface of the trigger arm is matched with the arc-shaped convex part of the traction rod, and the trigger arm and the traction rod will not get stuck or jam, which can ensure the more reliable transmission between the trigger arm and the traction rod. Description of the Drawings

[0010] Figure 1 It is a perspective view of an embodiment of the present invention.

[0011] Figure 2 It is a sectional view of an embodiment of the present invention.

[0012] Figure 3 It is an exploded view of an embodiment of the present invention.

[0013] Figure 4 It is a perspective view of the backup protection mechanism of an embodiment of the present invention.

[0014] Figure 5 It is a perspective view of the insulating support cover of an embodiment of the present invention. Detailed Embodiment

[0015] As Figures 1 to 5As shown in the figure, an embodiment of the utility model is a residual current protection circuit breaker with a backup protection mechanism, which includes a base 10, a middle cover 11 arranged on the base 10, a face cover 12 arranged on the middle cover 11, an operating mechanism 13 arranged in the base 10, an automatic reclosing mechanism 14 arranged in the middle cover 11 and used to drive the operating mechanism 13 to perform opening and closing actions, three groups of contact modules 20 respectively arranged in the base 10 and linked with the operating mechanism 13, and a current transformer module 15. The contact module 20 includes a contact box 21 arranged in the base 10, a moving contact frame 22 rotatably arranged in the contact box 21 and linked with the operating mechanism 13, a moving contact 23 arranged on the moving contact frame 22, an incoming line static contact 24 arranged in the contact box 21 and matched with the moving contact 23, and an outgoing line static contact 25 arranged in the contact box 21 and matched with the moving contact 23. One end of the outgoing line static contacts 25 of the three groups of contact modules 20 has three conductive parts 251 extending outside the contact box 21. Three backup protection mechanisms 30 respectively matched with the traction rod 131 of the operating mechanism 13 are arranged on the three conductive parts 251. The backup protection mechanism 30 includes a magnetic yoke 31 arranged on the conductive part 251, a bracket 32 arranged on the magnetic yoke 31, an armature 33 rotatably arranged on the bracket 32 and matched with the magnetic yoke 31, and a torsion spring 34 arranged between the bracket 32 and the armature 33. Two limiting arms 321 respectively abutted against one end of the armature 33 are arranged on the bracket 32. A trigger arm 331 is arranged at a position corresponding to the two limiting arms 321 at one end of the armature 33. The trigger arm 331 moves with the armature 33 and abuts against the traction rod 131, and constitutes the linkage cooperation between the traction rod 131 and the armature 33.

[0016] As Figures 2 to 5As shown, insulating support covers 26 are provided inside the base 10 corresponding to the three conductive parts 251. The insulating support covers 26 are separated between the three conductive parts 251 and the base 10. Three exhaust channels 260 are respectively formed between the insulating support covers 26 and the base 10 corresponding to the three groups of contact modules 20. Exhaust ports 211 communicating with the three exhaust channels 260 are provided on the contact boxes 21 of the three groups of contact modules 20. The exhaust channels can quickly discharge the high-pressure exhaust gas in the contact box, which is beneficial to improving the arc extinguishing performance of the contact module, and the service life of the contact module is longer. Exhaust guiding grooves 261 matched with the contact boxes 21 of the three groups of contact modules 20 are respectively provided inside the insulating support covers 26. Clamping convex rings 212 are provided on the contact boxes 21 of the three groups of contact modules 20 corresponding to the exhaust holes 211. Buckling grooves 262 matched with the clamping convex rings 212 are provided in the exhaust guiding grooves 261. The clamping convex rings 212 are clamped in the buckling grooves 262, and the contact boxes 21 of the three groups of contact modules 20 and the insulating support covers 26 are clamped and matched. The insulating support cover and the contact box are assembled by a clamping and matching method, which is convenient for the assembly of the insulating support cover and the contact box, and can ensure that the high-pressure gas in the contact box quickly enters the exhaust guiding groove, which is beneficial to improving the working reliability of the contact module. The basic shape of the cross-section of the yoke 31 is U-shaped. The conductive part 251 is inserted into the groove body 310 of the yoke 31. Suction inclined surfaces 311 matched with the armature 33 are respectively provided on both sides of the groove body 310 of the yoke 31. The yoke is designed with a U-shaped structure, and the yoke is provided with a suction inclined surface matched with the armature, which can increase the suction area between the yoke and the armature, so as to ensure that the yoke and the armature can be reliably sucked, which is beneficial to improving the working reliability of the backup protection mechanism. A driving inclined surface 332 matched with the traction rod 131 is provided on one side of the trigger arm 331. An arc-shaped convex part 132 matched with the driving inclined surface 332 is provided on one side of the traction rod 131. The driving inclined surface of the trigger arm is matched with the arc-shaped convex part of the traction rod, and the trigger arm and the traction rod will not be stuck or jammed, which can ensure the more reliable transmission of the trigger arm and the traction rod.

[0017] The contact module adopts a modular structure design, which is beneficial to realizing the modular assembly of the reclosing residual current protection circuit breaker, with higher assembly efficiency. The three contact modules are respectively independently arranged in the base, and the phase insulation performance is better. The static outlet contact has a conductive part with an integrated lead-out structure, with better conductivity and lower temperature rise. The backup protection mechanism is designed on the conductive part. This structural design is more compact, the backup protection mechanism occupies less space, and it is convenient for the assembly of the conductive part and the backup protection mechanism, and the assembly is more convenient. Therefore, the residual current protection circuit breaker with a backup protection mechanism has the advantages of simple structure, stable and reliable performance, good insulation performance, low temperature rise, high assembly efficiency, and small volume.

Claims

1. A residual current protection circuit breaker with a backup protection mechanism, comprising a base, a middle cover arranged on the base, a surface cover arranged on the middle cover, an operating mechanism arranged in the base, an automatic reclosing mechanism arranged in the middle cover and used to drive the operating mechanism to perform opening and closing actions, three groups of contact modules respectively arranged in the base and linked with the operating mechanism, and a transformer module, characterized in that: The contact module includes a contact box arranged in a base, a moving contact frame rotatably arranged in the contact box and linked with an operating mechanism, a moving contact arranged on the moving contact frame, an incoming static contact arranged in the contact box and matched with the moving contact, and an outgoing static contact arranged in the contact box and matched with the moving contact. One end of the outgoing static contact of the three groups of contact modules has three conductive parts extending outside the contact box, and three backup protection mechanisms matched with a traction rod of the operating mechanism are respectively arranged on the three conductive parts. The backup protection mechanism includes a yoke arranged on the conductive part, a bracket arranged on the yoke, an armature rotatably arranged on the bracket and matched with the yoke, and a torsion spring arranged between the bracket and the armature. Two limit arms that abut against one end of the armature are respectively arranged on the bracket, and a trigger arm is arranged between the two limit arms on one end of the armature. The trigger arm moves with the armature and abuts against the traction rod, and constitutes a linkage between the traction rod and the armature.

2. The residual current protection circuit breaker with backup protection mechanism according to claim 1, characterized in that: Insulating support covers are provided at locations corresponding to the three conductive parts in the base, and the insulating support covers are separated between the three conductive parts and the base. Three exhaust channels are respectively formed between the insulating support cover and the base at locations corresponding to the three groups of contact modules, and the contact boxes of the three groups of contact modules are provided with exhaust ports connected to the three exhaust channels.

3. The residual current protection circuit breaker with backup protection mechanism according to claim 2, characterized in that : The insulating support cover is respectively provided with exhaust guide grooves matching with the contact boxes of the three groups of contact modules, and the contact boxes of the three groups of contact modules are provided with snap-fitting convex rings at the corresponding exhaust holes, and the exhaust guide groove is provided with a snap-fitting groove matching with the snap-fitting convex ring. The snap-fitting convex ring is snap-fitted in the snap-fitting groove, and constitutes the snap-fitting of the contact boxes of the three groups of contact modules and the insulating support cover.

4. The residual current protection circuit breaker with backup protection mechanism according to claim 1 or 2, characterized in that The basic shape of the cross section of the magnetic yoke is U-shaped, the conductive part is inserted into the slot body of the magnetic yoke, and the magnetic yoke is provided with attraction inclined surfaces matching with the armature at both sides of the slot body.

5. The residual current protection circuit breaker with backup protection mechanism according to claim 1 or 2, characterized in that A driving inclined surface matched with the traction rod is arranged on one side of the trigger arm, and an arc-shaped protrusion matched with the driving inclined surface is arranged on one side of the traction rod.

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