Residual current protection circuit breaker with overload tripping mechanism

Abstract

The utility model relates to a residual current protection circuit breaker with an overload tripping 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, and is characterized in that each contact module comprises a contact box, a moving contact frame, a moving contact arranged on the moving contact frame, a wire inlet static contact and a wire outlet static contact; three conductive parts extending out of the contact box are arranged at one ends of outgoing line static contacts of the three sets of contact modules, an overload tripping mechanism matched with a traction rod of the operating mechanism is arranged in the middle cover, and the overload tripping mechanism comprises a support, an electromagnet, a lock catch piece, a torsion spring, a tripping driving piece matched with the traction rod and an energy storage spring. A locking piece is arranged at one end of the lock catch piece, a locking groove matched with the locking piece is formed in the tripping driving piece, the locking piece is buckled in the locking groove, and limiting matching of the lock catch piece and the tripping driving piece is formed. The utility model has the advantages of simple structure, stable and reliable performance, 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 an overload tripping 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 intellectualization. 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 overload tripping mechanism of the existing reclosing residual current protection circuit breaker is unreasonable. The overload tripping mechanism occupies a 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 realized, the assembly efficiency is low, and the production cost is high. 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 an overload tripping mechanism, which has a simple structure, stable and reliable performance, high assembly efficiency and small volume.

[0004] To achieve the above object, the utility model adopts a residual current protection circuit breaker with an overload tripping mechanism, which includes a base, a middle cover arranged on the base, a face 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 contact modules and a current transformer module which are respectively arranged in the base and are linked and cooperated with the operating mechanism. The contact module includes a contact box arranged in the base, a moving contact frame rotatably arranged in the contact box and linked and cooperated with the operating mechanism, a moving contact arranged on the moving contact frame, an incoming line static contact arranged in the contact box and cooperated with the moving contact, and an outgoing line static contact arranged in the contact box and cooperated with the moving contact. One end of the outgoing line static contacts of the three contact modules has three conductive parts extending outside the contact box. An overload tripping mechanism cooperated with the traction rod of the operating mechanism is arranged in the middle cover. The overload tripping mechanism includes a bracket arranged in the middle cover, an electromagnet arranged in the bracket, a locking part rotatably arranged on the bracket and linked and cooperated with the moving iron core of the electromagnet, a torsion spring arranged between the locking part and the bracket, a tripping driving part movably arranged on the bracket, and a energy storage spring arranged between the tripping driving part and the bracket. One end of the locking part has a locking piece, and a locking groove cooperated with the locking piece is arranged on the tripping driving part. The locking piece is buckled in the locking groove, and the limit cooperation between the locking part and the tripping driving part is formed. One end of the tripping driving part has a hook-shaped body cooperated with the traction rod. The hook-shaped body moves with the tripping driving part and abuts against the traction rod, and the linkage cooperation between the traction rod and the tripping driving part is formed.

[0005] The beneficial effects of the above structure are as follows: 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 and independently arranged in the base, and the phase insulation performance is better. The outgoing line static contact has a conductive part with an integrated lead-out structure, with better electrical conductivity and lower temperature rise. The overload tripping mechanism adopts an energy storage type structure design, with a more compact structure design. The overload tripping mechanism occupies less space and has a smaller volume, and the tripping force of the overload tripping mechanism is greater, so the action of the overload tripping mechanism is more sensitive. When closing, the traction rod of the operating mechanism can push the tripping driving part to move, and the tripping driving part can compress the energy storage spring, so as to realize the energy storage of the tripping driving part. When the line is abnormal, the electromagnet is energized and drives the moving iron core to move, the moving iron core drives the locking part to move, the locking part and the tripping driving part are unlocked, and the tripping driving part pushes the traction rod to move, so as to realize the tripping and opening of the residual current protection circuit breaker, which can play a role in protecting the line. Therefore, the residual current protection circuit breaker has the advantages of simple structure, stable and reliable performance, high assembly efficiency and small volume.

[0006] Specifically, a test button cooperating with the towing rod is movably arranged on the middle cover. A return spring is arranged between the test button and the middle cover. One end of the test button has a button part extending outside the face cover, and the other end of the test button has a push rod part abutting against the towing rod. The test button drives the towing rod to act through the push rod part, so as to ensure that the test button can reliably drive the towing rod to act.

[0007] Specifically, a contact inclined surface cooperating with the push rod part is arranged on the towing rod. The towing rod cooperates with the push rod part through the contact inclined surface, which can avoid jamming and blocking between the push rod part and the towing rod.

[0008] Specifically, the mutual inductor module includes a support frame arranged in the base, a zero-sequence mutual inductor arranged on the support frame, three metering mutual inductors respectively arranged on the support frame, and three protection current mutual inductors respectively arranged on the support frame. One ends of the three conductive parts have three wiring parts that sequentially pass through the zero-sequence mutual inductor, the three metering mutual inductors, and the three protection current mutual inductors and are exposed outside the support frame. The mutual inductor module adopts a modular structure design, which is beneficial to realizing the modular assembly of the mutual inductor module and the base, and the assembly efficiency is higher.

[0009] Specifically, three exhaust channels are respectively formed between the support frame and the base corresponding to the three groups of contact modules, and exhaust ports communicating with the three exhaust channels are arranged on the contact boxes of the three groups of contact modules. The support frame can isolate the three conductive parts from the three exhaust channels, and the insulation performance is better. Moreover, the exhaust channels can quickly discharge the high-pressure gas in the contact box, which is beneficial to improving the working reliability of the contact module. 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 an overload tripping mechanism of an embodiment of the present invention.

[0014] Figure 5 It is a front view of an overload tripping mechanism of an embodiment of the present invention. Detailed Embodiment

[0015] Such as Figures 1 to 5As shown in the figure, an embodiment of the utility model is a residual current protection circuit breaker with an overload tripping 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, and three groups of contact modules 20 and a current transformer module 40 respectively arranged in the base 10 and linked with the operating mechanism 13. The contact module 20 includes a contact box 21 arranged in the base 10, a moving contact holder 22 rotatably arranged in the contact box 21 and linked with the operating mechanism 13, a moving contact 23 arranged on the moving contact holder 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 21 has three conductive parts 251 extending outside the contact box 21. An overload tripping mechanism 30 matched with the traction rod 131 of the operating mechanism 13 is arranged in the middle cover 11. The overload tripping mechanism 30 includes a bracket 31 arranged in the middle cover 11, an electromagnet 32 arranged in the bracket 31, a locking part 33 rotatably arranged on the bracket 31 and linked with the moving iron core 321 of the electromagnet 32, a torsion spring 34 arranged between the locking part 33 and the bracket 31, a tripping driving part 35 movably arranged on the bracket 31, and a energy storage spring 36 arranged between the tripping driving part 35 and the bracket 31. One end of the locking part 33 has a locking piece 331. A locking groove 351 matched with the locking piece 331 is arranged on the tripping driving part 35. The locking piece 331 is buckled in the locking groove 351, and forms a limit cooperation between the locking part 33 and the tripping driving part 35. One end of the tripping driving part 35 has a hook-shaped body 352 matched with the traction rod 131. The hook-shaped body 352 moves with the tripping driving part 35 and abuts against the traction rod 131, and forms a linkage cooperation between the traction rod 131 and the tripping driving part 35.

[0016] As Figures 2 to 5As shown, a test button 15 that cooperates with the towing rod 131 is movably arranged on the middle cover 11. A return spring 16 is arranged between the test button 15 and the middle cover 11. One end of the test button 15 has a button part 151 extending outside the front cover 12, and the other end of the test button 15 has a push rod part 152 that abuts against the towing rod 131. The test button drives the towing rod to act through the push rod part, so as to ensure that the test button can reliably drive the towing rod to act. A contact inclined surface 132 that cooperates with the push rod part 152 is arranged on the towing rod 131. The towing rod cooperates with the push rod part through the contact inclined surface, which can prevent the push rod part from getting stuck or jammed with the towing rod. The current transformer module 40 includes a support frame 41 arranged in the base 10, a zero-sequence current transformer 42 arranged on the support frame 41, three metering current transformers 43 respectively arranged on the support frame 41, and three protective current transformers 44 respectively arranged on the support frame 41. One ends of the three conductive parts 251 have three wiring parts 252 that sequentially pass through the zero-sequence current transformer 42, the three metering current transformers 43, and the three protective current transformers 44 and are exposed outside the support frame 41. The current transformer module adopts a modular structure design, which is conducive to realizing the modular assembly of the current transformer module and the base, and the assembly efficiency is higher. Three exhaust channels 410 are respectively formed between the support frame 41 and the base 10 corresponding to the three groups of contact modules 20. Exhaust ports 211 communicating with the three exhaust channels 410 are arranged on the contact boxes 21 of the three groups of contact modules 20. The support frame can isolate the three conductive parts from the three exhaust channels, with better insulation performance, and the exhaust channels can quickly discharge the high-pressure gas in the contact box, which is conducive to improving the working reliability of the contact module.

[0017] The contact module adopts a modular structure design, which is conducive 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 outgoing line static contact has a conductive part with an integrated lead-out structure, with better electrical conductivity and lower temperature rise. The overload tripping mechanism adopts an energy storage structure design, with a more compact structure design. The overload tripping mechanism occupies less space and has a smaller volume, and the tripping force of the overload tripping mechanism is greater, so that the action of the overload tripping mechanism is more sensitive. When closing, the towing rod of the operating mechanism can push the tripping driving part to act, and the tripping driving part can compress the energy storage spring, so as to realize the energy storage of the tripping driving part. When the line is abnormal, the electromagnet is energized and drives the moving iron core to act. The moving iron core drives the locking part to act. The locking part is unlocked from the tripping driving part, and the tripping driving part pushes the towing rod to act, so as to realize the tripping and opening of the residual current protection circuit breaker, which can play a role in protecting the line. Therefore, the residual current protection circuit breaker has the advantages of simple structure, stable and reliable performance, high assembly efficiency, and small volume.

Claims

1. A residual current protection circuit breaker with an overload tripping mechanism, characterized in that: The invention comprises 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. The contact module comprises 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 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. A contact rod connected to the traction rod of the operating mechanism is arranged in the middle cover. The overload release mechanism comprises a bracket arranged in the middle cover, an electromagnet arranged in the bracket, a locking member rotatably arranged on the bracket and linked with the moving iron core of the electromagnet, a torsion spring arranged between the locking member and the bracket, a release driving member movably arranged on the bracket, and an energy storage spring arranged between the release driving member and the bracket. One end of the locking member has a locking plate, and the release driving member is provided with a locking groove matched with the locking plate. The locking plate is engaged in the locking groove and constitutes a limiting cooperation between the locking member and the release driving member. One end of the release driving member has a hook-shaped body matched with the traction rod. The hook-shaped body moves with the release driving member and contacts the traction rod, and constitutes a linkage cooperation between the traction rod and the release driving member.

2. The residual current protection circuit breaker with overload release mechanism according to claim 1, characterized in that: A test button cooperating with the traction rod is movably arranged on the middle cover, a reset spring is arranged between the test button and the middle cover, one end of the test button has a button portion extending outside the surface cover, and the other end of the test button has a top rod portion abutting against the traction rod.

3. The residual current protection circuit breaker with overload release mechanism according to claim 2, characterized in that: The traction rod is provided with a resisting inclined surface matched with the push rod part.

4. The residual current protection circuit breaker with overload release mechanism according to claim 1 or 2, characterized in that: The transformer module includes a support frame arranged in the base, a zero-sequence transformer arranged on the support frame, three metering transformers respectively arranged on the support frame, and three protection current transformers respectively arranged on the support frame. One end of the three conductive parts has three wiring parts that pass through the zero-sequence transformer, the three metering transformers, and the three protection current transformers in sequence and are exposed outside the support frame.

5. The residual current protection circuit breaker with overload release mechanism according to claim 4, characterized in that: Three exhaust channels are respectively formed between the support frame and the base corresponding to the three groups of contact modules, and exhaust ports connected to the three exhaust channels are arranged on the contact boxes of the three groups of contact modules.

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