Pluggable circuit breaker

Abstract

The utility model relates to the technical field of electric equipment, in particular to a plug-in type circuit breaker, which comprises a shell, a handle mounted at the top of the shell, a static contact, a moving contact and an armature arranged inside the shell, a bimetallic strip arranged on one side of the armature, a magnet yoke mounted on the bimetallic strip, the bimetallic strip connected to the moving contact through a flexible joint, and a magnetic yoke mounted on the magnet yoke. And a jump pin is arranged above the moving contact. In the plug-in circuit breaker, the handle pushes the re-buckling shaft to realize the movement of the tripping buckle, so that the contact and separation of the moving contact and the static contact are controlled, and the operation is simple, convenient and rapid. Two mechanisms of magnetic protection and thermal protection are combined. The magnet yoke provides magnetic protection, and when the current is abnormal, the generated magnetic field force can quickly attract the armature, so that the armature is separated from the jump pin, and the circuit is cut off. The bimetallic strip provides thermal protection, and when the bimetallic strip is heated to deform due to overlarge current, the armature is driven to be separated from the jump pin, and the circuit is cut off.

Description

TECHNICAL FIELD

[0001] The utility model relates to the technical field of electric equipment, specifically, a plug-in circuit breaker. BACKGROUND

[0002] In modern electrical systems, circuit breakers play a crucial role as key safety devices, protecting electrical circuits from overload, short circuit, and other fault conditions. While traditional circuit breakers can meet basic electrical protection needs to some extent, the continuous development of electrical technology and the diversification of application environments have raised higher requirements for circuit breaker performance. In particular, in applications requiring frequent plugging and unplugging, fast response, and high integration, traditional circuit breakers often have issues such as inconvenient operation, slow response speed, and insufficient protection accuracy.

[0003] Plug-in circuit breakers, as a new type of electrical protection device, have emerged in response to these needs. They combine the protection functions of traditional circuit breakers with convenient plug-in designs, making electrical system installation, maintenance, and replacement simpler and faster. However, existing plug-in circuit breakers still have many shortcomings in terms of structural design, protection mechanisms, and user experience. For example, some plug-in circuit breakers have unreasonable contact designs, leading to high contact resistance and easy heating, affecting service life; the protection mechanisms of some products are single, unable to simultaneously achieve multiple protections such as overcurrent and overheating; and some products have complex operations and poor user friendliness, causing inconvenience to the daily management and maintenance of electrical systems. SUMMARY

[0004] The utility model aims at providing a plug-in circuit breaker to solve the problems of existing plug-in circuit breakers in structural design, protection mechanisms, and user experience.

[0005] To achieve the above purpose, the utility model provides a plug-in circuit breaker, which comprises a shell, a handle mounted on the top of the shell, a static contact, a moving contact, and an armature arranged inside the shell, a bimetallic strip arranged on one side of the armature, a magnetic yoke mounted on the bimetallic strip, the bimetallic strip connected to the moving contact through a soft connection, a jump buckle arranged above the moving contact, the moving contact connected to the jump buckle through a contact spring, the moving contact swung by the handle push, and then contacted with the static contact.

[0006] As a preferred embodiment, a spring sheet is mounted on one side of the bottom of the shell, the inner side of the spring sheet connected to the static contact, a wiring screw assembly is mounted on the other side of the shell, a wiring board connected to the inner side of the wiring screw assembly, the wiring board connected to the bimetallic strip, a wire inlet end clamped on the outer side of the spring sheet, and a load end connected to the outer side of the wiring screw assembly.

[0007] As preferred, the terminal block is provided with an adjusting screw hole, and an adjusting screw is arranged on the adjusting screw hole, and the end of the adjusting screw is clamped on the outer wall of the shell, and the position of the bimetallic strip is changed by locking the adjusting screw, so that the overlapping stroke of the armature and the jump buckle is adjusted, and the purpose of adjusting the overload delay protection time is achieved.

[0008] As preferred, the magnetic yoke is riveted with the bimetallic strip, the magnetic yoke is provided with a U-shaped groove, and the armature is movably connected in the U-shaped groove of the magnetic yoke.

[0009] As preferred, the top end of the armature is fixed in the shell by an armature reset spring.

[0010] As preferred, one end of the jump buckle is rotatably connected with the inner wall of the shell through a pin shaft, a re-buckle shaft is arranged on the jump buckle, and the handle can realize the movement of the jump buckle by pushing the re-buckle shaft, so that the end of the jump buckle is clamped into the clamping port of the armature, and the overlapping effect is formed.

[0011] As preferred, a trip linkage rod is arranged in the shell, and the trip linkage rod is rotatably connected with the inner wall of the shell through a pin shaft.

[0012] As preferred, a push block is arranged on the jump buckle close to the trip linkage rod, and when the handle is operated to open the switch, the push block can push the trip linkage rod to swing, so as to press the armature to move, and the armature is away from the jump buckle.

[0013] As preferred, the middle part of the handle is rotatably connected with the inner wall of the shell through a pin shaft.

[0014] As preferred, a magnetic conducting sheet is arranged on the inner side of the shell close to the static contact.

[0015] Compared with the prior art, the utility model has the advantages of:

[0016] 1、The handle arranged on the top of the shell in the plug-in circuit breaker is designed, so that the user can easily perform the plug-in operation, and the installation, maintenance and replacement efficiency of the electrical system is greatly improved.

[0017] 2、The plug-in circuit breaker combines the magnetic protection and thermal protection mechanisms.

[0018] 3、The plug-in circuit breaker, through the adjusting bolt on the wiring board, the user can conveniently adjust the position of the bimetallic strip, thereby changing the lap travel of the armature and the jump buckle, realizing the accurate adjustment of the overload delay protection time. This design makes the circuit breaker be able to be flexibly configured according to different application environments and protection requirements, improves the protection precision and applicability.

[0019] 4、The plug-in circuit breaker, the moving contact is connected with the jump buckle through the contact spring and is swung through the handle push, and reliable contact is formed with the static contact. This design reduces the contact resistance, reduces the heating phenomenon, prolongs the service life of the circuit breaker. Meanwhile, the magnetic conducting sheet installed in the inside of the shell further enhances the electric conductivity and improves the overall performance of the circuit breaker.

[0020] 5、The plug-in circuit breaker, when the handle is manually operated, the push block can push the tripping linkage rod to swing, and then extrude the armature to move, so that the armature is away from the jump buckle. This tripping linkage mechanism ensures that the circuit breaker can manually and quickly cut off the circuit under fault condition, reduces the influence of the fault on the electrical system. BRIEF DESCRIPTION OF DRAWINGS

[0021] Figure 1 It is one of the structure schematic diagrams of the free tripping position of the utility model;

[0022] Figure 2 It is one of the structure schematic diagrams of the free tripping position of the utility model;

[0023] Figure 3 It is the structure schematic diagram of the reclosing tripping position in the utility model;

[0024] Figure 4 It is the structure schematic diagram of the closing position in the utility model;

[0025] Figure 5 It is the structure schematic diagram of the closing position in the utility model;

[0026] The meanings of various reference numerals in the drawings are as follows:

[0027] 1, shell; 11, spring piece; 12, wiring screw assembly; 13, wiring board; 14, adjusting bolt; 15, bimetallic strip; 16, magnetic yoke; 17, soft connection; 18, magnetic conducting sheet; 2, handle; 3, static contact; 4, moving contact; 41, contact spring; 5, jump buckle; 51, reclosing shaft; 52, push block; 6, armature; 61, armature reset spring; 62, bayonet; 7, tripping linkage rod. DETAILED DESCRIPTION

[0028] The technical solutions in the embodiments of the utility model will be clearly and completely described below with reference to the drawings in the embodiments of the utility model. Obviously, the described embodiments are only part of the embodiments of the utility model, rather than all the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of the utility model.

[0029] The utility model provides a plug -in circuit breaker, as shown in the figure, including shell 1, the top of shell 1 is installed handle 2, the inside of shell 1 is provided with static contact 3, moving contact 4, armature 6, the side of armature 6 is provided with bimetallic strip 15, bimetallic strip 15 is installed with magnetic yoke 16, bimetallic strip 15 is connected to moving contact 4 through soft connection 17, the top of moving contact 4 is provided with jump buckle 5, moving contact 4 is connected with jump buckle 5 through contact spring 41, moving contact 4 is swung by handle 2 and is pushed, and then is contacted with static contact 3. Figures 1-5 The handle 2 installed on the top of the shell 1 is designed so that the user can easily plug in and out and switch operation without complex tools or steps, greatly improving the convenience and efficiency of operation.

[0030] Moving contact 4 is flexibly connected with jump buckle 5 through contact spring 41 and can swing by the pushing of handle 2, thereby forming close contact with static contact 3. This design ensures that the circuit can be stably turned on when working normally, reduces the contact resistance, reduces the heating and arc phenomenon caused by poor contact, and improves the reliability and service life of the circuit breaker.

[0031] The bimetallic strip 15 and the magnetic yoke 16 provided on one side of the armature 6 jointly constitute a double protection mechanism of the circuit breaker. The bimetallic strip 15 can deform in response to current overheating, drive the moving contact 4 or the armature 6 to act through the soft connection 17, and realize thermal protection. The magnetic yoke 16 can generate a magnetic field force when the current is abnormal, attract the armature 6 to act, and realize magnetic protection. This double protection mechanism ensures that the circuit breaker can quickly and reliably cut off the circuit under various fault conditions, protecting electrical equipment and personal safety.

[0032] The connection mode of moving contact 4 and jump buckle 5 through contact spring 41 makes the action of the contact more flexible and controllable. Under the pushing of handle 2, moving contact 4 can quickly and accurately contact or separate from static contact 3, realizing accurate control of the circuit.

[0033] In this embodiment, the bottom side of the shell 1 is provided with a spring 11, the inner side of the spring 11 is connected with the static contact 3, the other side of the shell 1 is provided with a wiring screw assembly 12, the inner side of the wiring screw assembly 12 is connected with a wiring board 13, the wiring board 13 is connected with a bimetallic strip 15, the outer side of the spring 11 is provided with a wire inlet end, and the outer side of the wiring screw assembly 12 is connected with a load end. This design facilitates quick wiring and connection of the wire inlet end and the load end, and improves the installation efficiency and convenience of the circuit breaker. The design of the spring 11 ensures stable contact between the static contact 3 and the wire inlet end, and reduces circuit failure caused by poor contact.

[0034] Specifically, the wiring board 13 is provided with an adjusting screw hole, the adjusting screw hole is provided with an adjusting screw 14, the end of the adjusting screw 14 is clamped on the outer wall of the shell 1, the position of the bimetallic strip 15 is changed by locking the adjusting screw 14, the overlapping stroke of the armature 6 and the jump buckle 5 is adjusted, and the purpose of adjusting the overload delay protection time is achieved.

[0035] Further, the magnetic yoke 16 is riveted on the bimetallic strip 15, the magnetic yoke 16 is provided with a U-shaped groove, and the armature 6 is movably connected in the U-shaped groove of the magnetic yoke 16. This design enhances the connection stability of the magnetic yoke 16 and the bimetallic strip 15. The design of the U-shaped groove enables the armature 6 to move flexibly in the magnetic yoke 16, facilitating the functions of magnetic protection and thermal protection.

[0036] Further, the top end of the armature 6 is fixed inside the shell 1 by an armature reset spring 61. This design ensures that the armature 6 can maintain a stable position when not subjected to external force. The presence of the armature reset spring 61 enables the armature 6 to quickly reset after moving under the action of the magnetic yoke 16 or the bimetallic strip 15, preparing for the next protection action.

[0037] Further, one end of the jump buckle 5 is rotatably connected to the inner wall of the shell 1 through a pin shaft, the jump buckle 5 is provided with a jump buckle shaft 51, the handle 2 can move the jump buckle 5 by pushing the jump buckle shaft 51, and then the end of the jump buckle 5 is clamped into the clamp opening 62 of the armature 6, forming an overlapping effect.

[0038] Further, the shell 1 is internally provided with a tripping linkage rod 7, which is rotatably connected to the inner wall of the shell 1 through a pin shaft.

[0039] Further, the push block 52 is installed near the tripping linkage rod 7 of the jump buckle 5, and when the handle 2 is manually driven, the push block 52 can push the tripping linkage rod 7 to swing, thereby pressing the armature 6 to move, and realizing that the armature 6 moves away from the jump buckle 5.

[0040] Further, the middle part of the handle 2 is rotatably connected to the inner wall of the shell 1 through a pin shaft.

[0041] Further, the inner side of the shell 1 is installed with a magnetic conducting sheet 18 near the static contact 3. When the current passes through the contact, a magnetic field is generated. The magnetic conducting sheet can enhance the effect of the magnetic field, so that the magnetic field is more concentrated and powerful, which helps to improve the breaking capacity and arc extinguishing effect of the circuit breaker.

[0042] The magnetic yoke 16 provides magnetic protection, and the bimetallic sheet 15 provides thermal protection. When the current passes through, the bimetallic sheet 15 generates heat, and when the current is large enough, the bimetallic sheet 15 is deformed by heat, driving the armature 6 and the trip dog 5 to separate, thereby cutting off the circuit. The magnetic field force generated by the magnetic yoke 16 overcomes the force of the armature return spring 61 to attract the armature 6, thereby driving the armature 6 and the trip dog 5 to separate. The trip dog 5 is provided with a protrusion near the moving contact 4, and when the trip dog 5 swings, it can push the moving contact 4 to swing, so that it separates from the static contact 3, thereby cutting off the circuit.

[0043] When the plug-in circuit breaker is used, first, when the circuit breaker is in a normal working state, the handle 2 is in a closed position, and the moving contact 4 is in close contact with the static contact 3 by the elastic force of the contact spring 41, and the circuit is in a conducting state. The armature 6 is kept in a stable position under the action of the armature return spring 61 and does not separate from the trip dog 5. The bimetallic sheet 15 and the magnetic yoke 16 are both in an inaction state.

[0044] When an overload or short circuit occurs in the circuit, causing the current to be too large, the current passes through the bimetallic sheet 15 to generate a large amount of heat. The bimetallic sheet 15 deforms due to uneven heating, and the deformation force is transmitted to the moving contact 4 or the armature 6 through the soft connection 17. When the deformation reaches a certain degree, the lap travel of the armature 6 and the trip dog 5 changes, causing the armature 6 and the trip dog 5 to separate. The trip dog 5 swings and acts on the moving contact 4, causing the moving contact 4 to quickly separate from the static contact 3, cutting off the circuit and achieving thermal protection.

[0045] When an abnormally large current occurs in the circuit, a strong magnetic field is generated around the magnetic yoke 16. The magnetic field force overcomes the elastic force of the armature return spring 61 and attracts the armature 6 to move towards the magnetic yoke 16. The movement of the armature 6 causes the lap travel of the armature 6 and the trip dog 5 to change, eventually separating from the trip dog 5. Similar to thermal protection, the separation of the trip dog 5 causes the moving contact 4 to separate from the static contact 3, cutting off the circuit and achieving magnetic protection.

[0046] When manual circuit interruption is required, the user can operate the handle 2 to rotate it from the closed position to the open position. The rotation of the handle 2 drives the trip dog 7 to move, causing the end of the trip dog 5 to come out of the armature 6. The separation of the trip dog 5 causes the moving contact 4 to separate from the static contact 3 under the action of the contact spring 41, cutting off the circuit.

[0047] By adjusting the adjusting bolt 14 on the terminal block 13, the position of the bimetallic strip 15 can be changed. The locking or loosening of the adjusting bolt 14 will change the lap travel of the armature 6 and the jumper 5, thereby affecting the time required for the bimetallic strip 15 to be deformed by heat to disengage the jumper 5. In this way, the adjustment of the overload delay protection time can be realized to meet the needs of different application scenarios.

[0048] The basic principle, main features and advantages of the present application are shown and described above. Those skilled in the art should understand that the present application is not limited by the above examples, and the above examples and descriptions in the specification are only preferred examples of the present application and are not intended to limit the present application. Without departing from the spirit and scope of the present application, various changes and improvements can be made to the present application, and these changes and improvements all fall within the scope of the claimed present application. The scope of protection of the present application is defined by the appended claims and their equivalents.

Claims

1. A plug-in circuit breaker comprising a housing (1), characterized in that: The top of the shell (1) is provided with a handle (2), the inside of the shell (1) is provided with a static contact (3), a moving contact (4), an armature (6), one side of the armature (6) is provided with a bimetallic strip (15), the bimetallic strip (15) is provided with a magnetic yoke (16), the bimetallic strip (15) is connected to the moving contact (4) through a soft connection (17), the upper side of the moving contact (4) is provided with a jump buckle (5), the moving contact (4) is connected with the jump buckle (5) through a contact spring (41), the moving contact (4) is swung by pushing the handle (2), and then the moving contact (4) is contacted with the static contact (3); The bottom side of the shell (1) is provided with an elastic sheet (11), the inner side of the elastic sheet (11) is connected with the static contact (3), the other side of the shell (1) is provided with a wiring screw assembly (12), the inner side of the wiring screw assembly (12) is connected with a wiring board (13), the wiring board (13) is connected with the bimetallic strip (15), the outer side of the elastic sheet (11) is clamped with a wire inlet end, and the outer side of the wiring screw assembly (12) is connected with a load end. The wiring board (13) is provided with an adjusting screw hole, the adjusting screw hole is provided with an adjusting bolt (14), the end of the adjusting bolt (14) is clamped on the outer wall of the shell (1), the position of the bimetallic strip (15) is changed by locking the adjusting bolt (14), the overlapping stroke of the armature (6) and the jump buckle (5) is adjusted, and the purpose of adjusting the overload delay protection time is achieved.

2. The plug-in circuit breaker of claim 1, wherein: The magnetic yoke (16) is riveted on the bimetallic strip (15), the magnetic yoke (16) is provided with a U-shaped groove, and the armature (6) is movably connected in the U-shaped groove of the magnetic yoke (16).

3. The plug-in circuit breaker of claim 1, wherein: The top end of the armature (6) is fixed in the shell (1) by an armature reset spring (61).

4. The plug-in circuit breaker of claim 1, wherein: One end of the jump buckle (5) is rotatably connected with the inner wall of the shell (1) through a pin shaft, the jump buckle (5) is provided with a re-buckle shaft (51), the handle (2) can realize the movement of the jump buckle (5) by pushing the re-buckle shaft (51), and then the end of the jump buckle (5) is clamped into the bayonet (62) of the armature (6), so that the overlapping effect is formed.

5. The plug-in circuit breaker of claim 4, wherein: The inside of the shell (1) is provided with a tripping linkage rod (7), and the tripping linkage rod (7) is rotatably connected with the inner wall of the shell (1) through a pin shaft.

6. The plug-in circuit breaker of claim 5, wherein: The jump buckle (5) is provided with a push block (52) close to the tripping linkage rod (7), when the handle (2) is operated, the push block (52) can push the tripping linkage rod (7) to swing, so as to extrude the armature (6) to move, and realize that the armature (6) is away from the jump buckle (5).

7. The plug-in circuit breaker of claim 5, wherein: The middle part of the handle (2) is rotatably connected with the inner wall of the shell (1) through a pin shaft.

8. The plug-in circuit breaker of claim 1, wherein: The inner side of the shell (1) is provided with a magnetic conducting sheet (18) close to the static contact (3).

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