Shunt assembly commonly used for circuit breaker

Abstract

The utility model discloses a shunt assembly commonly used for a circuit breaker, the universal shunt assembly realizes on-demand configuration of functions of the shunt assembly through a detachable design of an auxiliary cover body and an external microswitch, and when the circuit breaker only needs a shunt tripping function, the auxiliary cover body and the external microswitch can be rapidly disassembled, thereby simplifying the structure; when a shunt excitation auxiliary function is needed, the shunt excitation device can be quickly installed, and diversified requirements are met. According to the universal design, the function integration of the shunt tripping assembly and the shunt auxiliary assembly is realized, so that the base, the upper bracket and other core components can share a mold, the number of molds and the development cost are remarkably reduced, the assembly process is simplified by the modular design, the conversion time and cost in the production link are reduced, and the production efficiency is improved.

Description

Technical Field

[0001] This utility model relates to the technical field of circuit breaker accessories, specifically to a shunt trip assembly commonly used in circuit breakers. Background Technology

[0002] In circuit breaker systems, shunt trip components typically refer to shunt trip units and their related auxiliary functional components, mainly including shunt trip units and shunt auxiliary components.

[0003] A shunt trip unit is a device used for remotely controlling the tripping of a circuit breaker. When an external control signal (usually a voltage signal) is applied to the shunt trip unit, it drives the circuit breaker's operating mechanism, causing the circuit breaker to trip and thus disconnecting the circuit. Its main purpose is to quickly disconnect the circuit when needed to protect equipment and personnel safety. Auxiliary shunt trip units typically refer to auxiliary functions or components (such as auxiliary contacts) used in conjunction with the shunt trip unit. The auxiliary contacts are generally linked to the operating mechanism of the shunt trip unit. When the shunt trip unit actuates to trip the circuit breaker, the auxiliary contacts will change their state accordingly (normally open contacts close, normally closed contacts open), thereby sending a signal to the external circuit or control system.

[0004] Although there are some commonalities between the shunt trip assembly and the shunt auxiliary assembly, the structures of the existing shunt trip assembly and the shunt auxiliary assembly on the circuit breaker are not the same. Therefore, from a production perspective, it is necessary to design two different injection molds for production, and from an inventory perspective, there is a certain inventory pressure.

[0005] In view of this, there is an urgent need to design a shunt trip assembly that is universal for circuit breakers in order to improve the versatility of the shunt trip assembly in circuit breakers. Summary of the Invention

[0006] To address the aforementioned problems, this utility model provides a shunt trip assembly applicable to circuit breakers, comprising a base and an upper bracket connected to the base. An assembly cavity is provided between the base and the upper bracket. An electromagnetic coil assembly, a shunt trip push rod, and a built-in micro switch are housed within the assembly cavity. The shunt trip push rod is linked to the electromagnetic coil assembly. An auxiliary cover is detachably connected to the side of the base, and an external micro switch is connected within the auxiliary cover. The upper bracket has a connecting shaft and an auxiliary push rod movably connected to the connecting shaft. The auxiliary push rod includes a rotating shaft portion, a first linkage portion, a second linkage portion, and an actuating portion. The rotating shaft portion is connected to the connecting shaft. The first linkage portion is located at the opening of the assembly cavity and is linked to the built-in micro switch. The second linkage portion extends to the side of the base and is linked to the external micro switch. The actuating portion is linked to the rotating shaft of the circuit breaker.

[0007] The present invention is further configured such that the middle part of the upper bracket extends along the direction of the opening to form a bracket mounting part, and the connecting shaft is located on the side of the bracket mounting part.

[0008] The present invention is further configured such that a bracket positioning post is provided at the position of the upper bracket facing the assembly cavity, and a built-in positioning hole is provided on the built-in micro switch, the bracket positioning post is connected in the built-in positioning hole, and the built-in micro switch is fixed between the base and the upper bracket.

[0009] The present invention is further configured such that the position of the first linkage part opposite the trigger part of the built-in micro switch is a first flat end face.

[0010] The present invention is further configured such that a base connection hole is provided on the side of the base, an external positioning hole is provided on the external micro switch, and a cover positioning post and a cover connecting post are respectively provided in the auxiliary cover body. The cover positioning post is connected in the external positioning hole, and the cover connecting post is connected in the base connection hole.

[0011] The present invention is further configured such that a fixed cavity is formed in the auxiliary cover body, the external micro switch is connected in the fixed cavity, a cover notch is formed on one side of the auxiliary cover body, the trigger part of the external micro switch is directly opposite the cover notch, and the cover positioning post is located between the cover connecting post and the cover notch.

[0012] The present invention is further configured such that the position of the second linkage part opposite the trigger part of the external micro switch is the second flat end face.

[0013] The present invention further comprises the electromagnetic coil assembly including a coil support, a coil frame, a stationary iron core, and a moving iron core fixed on the base. The coil frame has a hook portion and a fastening portion on both sides, and the upper support has a step portion and a ramp portion on both sides. The hook portion is connected to the step portion, and the fastening portion is connected to the ramp portion. The stationary iron core and the moving iron core are respectively connected to the two ends of the coil frame. A coil is wound on the coil frame. The coil support has a shunt excitation shaft. The shunt excitation push rod includes a support foot portion, a mating portion, and a lever portion. The support foot portion is connected to the shunt excitation shaft, the mating portion is connected to the moving iron core, and the lever portion is linked and cooperates with the traction rod of the circuit breaker.

[0014] The present invention is further configured such that a clearance opening is provided on the base, and the actuating part extends through the clearance opening to the outside of the base.

[0015] The present invention is further provided with an anti-detachment part at the outer end of the connecting shaft.

[0016] The functional principle of the shunt trip assembly in this technical solution is as follows: when the electromagnetic coil assembly receives an action signal, it causes the shunt trip push rod to move. The shunt trip push rod then acts on the traction rod of the circuit breaker to realize the tripping function of the shunt trip assembly. When the circuit breaker shaft acts on the action part of the auxiliary push rod, the first and second linkage parts of the auxiliary push rod act on the trigger parts of the built-in micro switch and the trigger parts of the external micro switch, respectively, to realize the transmission of the circuit breaker opening and closing signals.

[0017] Compared with the prior art, the technical solution provided by this utility model has the following advantages:

[0018] When the circuit breaker only requires the shunt trip function, simply remove the auxiliary cover and the external micro switch, and install the shunt trip assembly into the shunt trip assembly mounting slot of the circuit breaker. When the circuit breaker requires the shunt trip auxiliary function, connect the auxiliary cover and the external micro switch to the side of the base, and then install the shunt trip assembly into the shunt trip assembly mounting slot of the circuit breaker.

[0019] This utility model's universal shunt trip assembly achieves on-demand configuration of shunt trip assembly functions through the detachable design of the auxiliary cover and external micro switch. When the circuit breaker only requires the shunt trip function, the auxiliary cover and external micro switch can be quickly disassembled, simplifying the structure; when the shunt trip auxiliary function is required, it can be quickly installed to meet diverse needs. This universal design integrates the functions of the shunt trip assembly and the shunt trip auxiliary assembly, allowing core components such as the base and upper bracket to share molds, significantly reducing the number of molds and development costs. The modular design simplifies the assembly process, reduces conversion time and costs in the production process, and improves production efficiency.

[0020] This utility model of a universal shunt excitation component reduces the types and quantities of parts through the standardized design of functional modules, making inventory management more efficient. Enterprises do not need to stock up on shunt excitation components with different functions separately, thus reducing inventory costs and capital occupation. Attached Figure Description

[0021] Figure 1 This is a perspective view of the excitation component in an embodiment of the present utility model.

[0022] Figure 2 This is an exploded view of the excitation component in an embodiment of this utility model.

[0023] Figure 3 This is a perspective view of the electromagnetic coil assembly and shunt excitation rod according to an embodiment of the present utility model.

[0024] Figure 4 This is a top view of the electromagnetic coil assembly and shunt excitation rod according to an embodiment of the present invention.

[0025] Figure 5 for Figure 4 Sectional view of AA.

[0026] Figure 6 This is a perspective view of the base and upper support of an embodiment of the present utility model.

[0027] Figure 7 This is an exploded view of the base, built-in micro switch, and upper bracket of an embodiment of this utility model.

[0028] Figure 8 This is a cross-sectional view of the excitation component according to an embodiment of the present utility model.

[0029] Figure 9 This is a perspective view of the auxiliary push rod in an embodiment of the present utility model.

[0030] Figure 10 This is an exploded view of the auxiliary cover and external micro switch in an embodiment of this utility model. Detailed Implementation

[0031] To make the objectives, technical solutions, and advantages of the embodiments of this utility model clearer, the technical solutions of the embodiments of this utility model will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0032] Combined with appendix Figure 1 To be continued Figure 10 This utility model provides a shunt trip assembly applicable to circuit breakers, comprising a base 1 and an upper bracket 2 connected to the base 1. An assembly cavity 3 is provided between the base 1 and the upper bracket 2. An electromagnetic coil assembly 4, a shunt trip push rod 5, and a built-in micro switch 6 are disposed within the assembly cavity 3. The shunt trip push rod 5 is linked to the electromagnetic coil assembly 4. An auxiliary cover 7 is detachably connected to the side of the base 1, and an external micro switch 8 is connected within the auxiliary cover 7. A connecting shaft 21 and an auxiliary push rod 9 movably connected to the connecting shaft 21 are provided on the upper bracket 2. The auxiliary push rod 9 includes a rotating shaft portion 91, a first linkage portion 92, a second linkage portion 93, and an action portion 94. The rotating shaft portion 91 is connected to the connecting shaft 21. The first linkage portion 92 is located at the opening 31 of the assembly cavity 3 and is linked to the built-in micro switch 6. The second linkage portion 93 extends to the side of the base 1 and is linked to the external micro switch 8. The action portion 94 is linked to the rotating shaft of the circuit breaker.

[0033] In this embodiment, the base 1 and the upper bracket 2 are both integrally injection molded, and the base 1 and the upper bracket 2 are fixedly connected by a snap-fit ​​positioning method.

[0034] In this embodiment, the functional principle of the shunt trip assembly is as follows: when the electromagnetic coil assembly 4 receives the action signal, it causes the shunt trip push rod 5 to move. The shunt trip push rod 5 acts on the traction rod of the circuit breaker to realize the tripping function of the shunt trip assembly. When the circuit breaker shaft acts on the action part 94 of the auxiliary push rod 9, the first linkage part 92 and the second linkage part 93 of the auxiliary push rod 9 act on the trigger part of the built-in micro switch 6 and the trigger part of the external micro switch 8, respectively, to realize the transmission of the circuit breaker opening and closing signals.

[0035] In this embodiment, when the circuit breaker only needs the shunt trip function, simply remove the auxiliary cover 7 and the external micro switch 8, and install the shunt trip assembly into the shunt trip assembly mounting slot of the circuit breaker; when the circuit breaker needs the shunt trip auxiliary function, connect the auxiliary cover 7 and the external micro switch 8 to the side of the base 1, and then install the shunt trip assembly into the shunt trip assembly mounting slot of the circuit breaker.

[0036] In this embodiment, in conjunction with the appendix Figure 6 and attached Figure 7 The middle part of the upper bracket 2 extends along the direction of the opening 31 to form a bracket mounting part 22, and the connecting shaft 21 is located on the side of the bracket mounting part 22.

[0037] In this embodiment, in conjunction with the appendix Figure 7 The upper bracket 2 is provided with a bracket positioning post 23 facing the assembly cavity 3. The built-in micro switch 6 is provided with a built-in positioning hole 61. The bracket positioning post 23 is connected in the built-in positioning hole 61. The built-in micro switch 6 is fixed between the base 1 and the upper bracket 2 to ensure the stability of the built-in micro switch 6 in the shunt excitation assembly.

[0038] In this embodiment, in conjunction with the appendix Figure 9 The first linkage part 92 is positioned opposite the trigger part of the built-in micro switch 6 at the first flat end face 95. When the rotating shaft of the circuit breaker touches the action part 94, the first flat end face 95 triggers the trigger part of the built-in micro switch 6.

[0039] In this embodiment, in conjunction with the appendix Figure 7 and attached Figure 10 The base 1 has a base connection hole 11 on its side, and the external micro switch 8 has an external positioning hole 81. The auxiliary cover 7 has a cover positioning post 71 and a cover connecting post 72. The cover positioning post 71 is connected to the external positioning hole 81, and the cover connecting post 72 is connected to the base connection hole 11. Since the circuit breaker has a pre-drilled mounting slot that matches the size of the shunt trip assembly, the auxiliary cover 7 only needs to be positioned on the base 1, and the mounting slot is used for limiting its position.

[0040] In this embodiment, in conjunction with the appendix Figure 10 The auxiliary cover 7 has a fixed cavity 73 inside, and the external micro switch 8 is connected in the fixed cavity 73. The auxiliary cover 7 has a cover notch 74 on one side, and the trigger part of the external micro switch 8 is directly opposite the cover notch 74. The cover positioning post 71 is located between the cover connecting post 72 and the cover notch 74, so that the auxiliary cover 7 covers the external micro switch 8, ensuring the stability of the external micro switch 8 when installed on the side of the base 1.

[0041] In this embodiment, in conjunction with the appendix Figure 9 The second linkage part 93 is positioned opposite the trigger part of the external micro switch 8 at the second flat end face 96. When the rotating shaft of the circuit breaker touches the actuating part 94, the second flat end face 96 triggers the trigger part of the external micro switch 8.

[0042] In this embodiment, in conjunction with the appendix Figure 3 To be continued Figure 5 The electromagnetic coil assembly 4 includes a coil support 41, a coil frame 42, a stationary iron core 43, and a moving iron core 44 fixed on the base 1. The coil frame 42 has a hook portion 421 and a fastening portion 422 on both sides. The upper support 2 has a step portion 24 and a ramp portion 25 on both sides. The hook portion 421 is connected to the step portion 24, and the fastening portion 422 is connected to the ramp portion 25. The stationary iron core 43 and the moving iron core 44 are respectively connected to the two ends of the coil frame 42. A coil is wound on the coil frame 42. The coil support 41 has a shunt excitation shaft 411. The shunt excitation push rod 5 includes a support foot portion 51, a mating portion 52, and a lever portion 53. The support foot portion 51 is connected to the shunt excitation shaft 411. The mating portion 52 is connected to the moving iron core 44. The lever portion 53 is linked to the traction rod of the circuit breaker.

[0043] In this embodiment, in conjunction with the appendix Figure 7 The base 1 has a clearance opening 12, and the actuating part 53 extends through the clearance opening 12 to the outside of the base 1.

[0044] In this embodiment, in conjunction with the appendix Figure 7 The outer end of the connecting shaft 21 is provided with an anti-detachment part 26, which prevents the auxiliary push rod 9 from falling off the connecting shaft 21.

[0045] In this embodiment, the universal shunt trip assembly achieves on-demand configuration of shunt trip assembly functions through the detachable design of the auxiliary cover 7 and the external micro switch 8. When the circuit breaker only requires the shunt trip function, the auxiliary cover 7 and the external micro switch 8 can be quickly disassembled, simplifying the structure; when the shunt trip auxiliary function is required, it can be quickly installed to meet diverse needs. This universal design integrates the functions of the shunt trip assembly and the shunt trip auxiliary assembly, allowing core components such as the base 1 and the upper bracket 2 to share molds, significantly reducing the number of molds and development costs. The modular design simplifies the assembly process, reduces conversion time and costs in the production process, and improves production efficiency. At the same time, it reduces the types and quantities of parts, making inventory management more efficient. Enterprises do not need to stock shunt trip assemblies with different functions separately, reducing inventory costs and capital occupation.

[0046] It should also be noted that, in this specification, relational terms such as "first" and "second" are used only to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element.

[0047] The above description of the disclosed embodiments enables those skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the general principles defined herein may be implemented in other embodiments without departing from the spirit or scope of the present invention. Therefore, the present invention is not to be limited to the embodiments shown herein, but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.

Claims

1. A shunt trip assembly for circuit breakers, comprising a base and an upper bracket connected to the base, wherein an assembly cavity is provided between the base and the upper bracket, and an electromagnetic coil assembly, a shunt trip push rod, and a built-in micro switch are disposed within the assembly cavity, the shunt trip push rod being linked to the electromagnetic coil assembly, characterized in that, An auxiliary cover is detachably connected to the side of the base. An external micro switch is connected inside the auxiliary cover. The upper bracket is provided with a connecting shaft and an auxiliary push rod movably connected to the connecting shaft. The auxiliary push rod includes a rotating shaft, a first linkage, a second linkage, and an action part. The rotating shaft is connected to the connecting shaft. The first linkage is located at the opening of the assembly cavity and is linked to the built-in micro switch. The second linkage extends to the side of the base and is linked to the external micro switch. The action part is linked to the rotating shaft of the circuit breaker.

2. A shunt trip assembly for circuit breakers according to claim 1, characterized in that, The middle part of the upper bracket extends along the direction of the opening to form a bracket mounting part, and the connecting shaft is located on the side of the bracket mounting part.

3. A shunt trip assembly for circuit breakers according to claim 2, characterized in that, The upper bracket is provided with a bracket positioning post facing the assembly cavity. The built-in micro switch is provided with a built-in positioning hole. The bracket positioning post is connected in the built-in positioning hole. The built-in micro switch is fixed between the base and the upper bracket.

4. A shunt trip assembly for circuit breakers according to claim 3, characterized in that, The first linkage part is positioned opposite the trigger part of the built-in micro switch, which is a first flat end face.

5. A shunt trip assembly for circuit breakers according to claim 1, characterized in that, The base has a base connection hole on its side, the external micro switch has an external positioning hole, and the auxiliary cover has a cover positioning post and a cover connecting post respectively. The cover positioning post is connected to the external positioning hole, and the cover connecting post is connected to the base connection hole.

6. A shunt trip assembly for circuit breakers according to claim 5, characterized in that, The auxiliary cover has a fixed cavity, the external micro switch is connected in the fixed cavity, the auxiliary cover has a cover notch on one side, the trigger part of the external micro switch is facing the cover notch, and the cover positioning post is located between the cover connecting post and the cover notch.

7. A shunt trip assembly for circuit breakers according to claim 6, characterized in that, The second linkage part is positioned opposite the trigger part of the external micro switch, which is the second flat end face.

8. A shunt trip assembly for circuit breakers according to any one of claims 1 to 7, characterized in that, The electromagnetic coil assembly includes a coil support, a coil frame, a stationary iron core, and a moving iron core fixed on the base. The coil frame has a hook portion and a fastening portion on each side. The upper support has a step portion and a ramp portion on each side. The hook portion connects to the step portion, and the fastening portion connects to the ramp portion. The stationary iron core and the moving iron core are respectively connected to both ends of the coil frame. A coil is wound on the coil frame. A shunt excitation shaft is provided on the coil support. The shunt excitation push rod includes a support leg portion, a mating portion, and a lever portion. The support leg portion is connected to the shunt excitation shaft, the mating portion is connected to the moving iron core, and the lever portion is linked to the circuit breaker's traction rod.

9. A shunt trip assembly for circuit breakers according to claim 8, characterized in that, The base has a clearance opening, and the actuating part extends through the clearance opening to the outside of the base.

10. A shunt trip assembly for circuit breakers according to any one of claims 1 to 7, characterized in that, The outer end of the connecting shaft is provided with an anti-detachment part.

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