Circuit breaker

Abstract

The utility model discloses a circuit breaker, which comprises a shell with an arc extinguish chamber and an electromagnetic assembly, and the electromagnetic assembly is provided with a coil framework, a coil and a magnet yoke. The magnet yoke is provided with a baffle part and a supporting part. The baffle part is arranged between the arc extinguish chamber and the electromagnetic assembly. According to the design, the magnet yoke baffle plate is used for preventing the arc from rising, changing the arc path and helping the arc to be reflected back to the arc extinguish chamber, thereby reducing the influence on components above an electromagnetic assembly and the like, guaranteeing the normal operation of the components, improving the arc extinguishing effect and efficiency, and prolonging the service life and reliability of the circuit breaker. The arc extinguishing time is shortened; the fault current response and cut-off capability of the circuit breaker is enhanced; the distribution of an internal electric field and a magnetic field is optimized; the working efficiency of an electromagnetic assembly is improved;

Description

TECHNICAL FIELD

[0001] The utility model relates to circuit breaker technical field, specifically related to a circuit breaker. BACKGROUND

[0002] In the power system, the circuit breaker plays a vital role, which can turn on, carry and break the current under normal and fault conditions, and guarantee the safe and stable operation of the power line. A kind of existing circuit breaker generally includes shell with arc-extinguishing chamber and electromagnetic assembly, wherein electromagnetic assembly contains coil framework, coil and yoke and other components.

[0003] However, the structure widely used at present is that the yoke of electromagnetic assembly is arranged above electromagnetic assembly (such as the circuit breaker quick tripping mechanism disclosed in application No. CN201520628719X). In the working process of circuit breaker, the arc generated by arc-extinguishing chamber often has the tendency of flowing upward (arc uplift). When arc uplifts, it is extremely easy to cause adverse effects on electromagnetic assembly and other components above arc-extinguishing chamber. The interaction of arc and electromagnetic assembly and other components can interfere with the normal work of electromagnetic assembly, reduce the stability of its electromagnetic performance. At the same time, arc uplift is also not conducive to the effective performance of arc-extinguishing process, which will prolong the arc-extinguishing time, reduce the arc-extinguishing efficiency, and further affect the product performance and reliability of the entire circuit breaker. Therefore, a new structure design is needed to overcome a series of problems caused by arc uplift in the prior art, improve the arc-extinguishing effect and overall product performance of circuit breaker, so as to meet the increasing performance requirements of power system for circuit breaker. SUMMARY

[0004] In view of the deficiencies in the background art, the utility model provides a circuit breaker.

[0005] The technical scheme adopted by the utility model is: a circuit breaker, including shell with arc-extinguishing chamber and electromagnetic assembly, the electromagnetic assembly includes coil framework, coil and yoke, the yoke includes baffle part and support part connected with coil framework, the baffle part is arranged between arc-extinguishing chamber and electromagnetic assembly.

[0006] Further, the shell between arc-extinguishing chamber and electromagnetic assembly is provided with positioning installation structure for positioning yoke.

[0007] Further, the positioning installation structure includes upper step and lower step arranged on the shell, and the baffle part is installed and clamped between the upper step and the lower step.

[0008] Further, the height of the baffle part is not lower than the height of arc-extinguishing sheet in arc-extinguishing chamber.

[0009] Further, the support part is provided with concave surface for supporting the end part of coil framework.

[0010] Further, the static contact has a hook portion bent to one side of the arc extinguishing chamber.

[0011] Further, the static contact has a hook portion bent to one side of the arc extinguishing chamber.

[0012] The utility model discloses the beneficial effect is:

[0013] Firstly, the magnetic yoke effectively solves the problem of arc uplift in the arc extinguishing chamber. As a barrier, the magnetic yoke can change the movement path of the arc, making it difficult to flow upward to the area where the electromagnetic assembly is located. At the same time, it helps the arc to reflect back to the arc extinguishing chamber, thereby greatly reducing the impact of the arc on the electromagnetic assembly and other upper components, ensuring the normal operation and performance stability of these components, reducing the risk of component damage or performance degradation caused by arc interference, improving the arc extinguishing effect and efficiency, significantly extending the service life of the circuit breaker and improving its operation reliability.

[0014] Secondly, since the arc uplift is suppressed, the arc extinguishing process can be carried out more efficiently. The arc can be extinguished more concentratedly in the arc extinguishing chamber according to the predetermined arc extinguishing mechanism, avoiding the difficulty of arc extinguishing caused by disordered diffusion of the arc, shortening the arc extinguishing time and improving the arc extinguishing efficiency, thereby improving the rapid response and cutting capacity of the circuit breaker to fault current and enhancing the safety and stability of the power system under fault conditions.

[0015] In addition, this structure optimizes the distribution of electric field and magnetic field inside the circuit breaker. While blocking the arc, the magnetic yoke also plays its original role of guiding and constraining the magnetic field generated by the electromagnetic assembly, so that it can act more accurately on the relevant components, improving the working efficiency of the electromagnetic assembly and further improving the electrical performance and operating characteristics of the circuit breaker as a whole, making the circuit breaker work more stably and reliably under various working conditions, and providing a stronger guarantee for the safe and stable operation of the power system.

[0016] In addition to the purposes, features and advantages described above, the utility model has other purposes, features and advantages.

[0017] The utility model will be further described in detail with reference to the accompanying drawings. BRIEF DESCRIPTION OF DRAWINGS

[0018] Figure 1 The utility model discloses the structure schematic drawing.

[0019] Figure 2A structural schematic view of the housing.

[0020] Figure 3 A structural schematic view of the magnetic yoke.

[0021] Figure 4 A structural schematic view of the static contact.

[0022] Figures 1-4 In the figure, 1 is an arc-extinguishing chamber, 2 is a housing, 3 is a coil framework, 4 is a coil, 5 is a magnetic yoke, 6 is a baffle part, 7 is a supporting part, 8 is an upper step, 9 is a lower step, 10 is a concave surface, 11 is a static contact, 12 is a hook part, 13 is a connecting part, 14 is a connecting convex point, 15 is a connecting part, and 16 is a connecting through hole. DETAILED DESCRIPTION

[0023] 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 in the utility model, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the utility model.

[0024] It should be noted that if the embodiments of the utility model involve directional indications (such as up, down, left, right, front, back, etc.), the directional indications are only used to explain the relative positional relationship, movement condition, etc. between the components in a certain specific posture (as shown in the drawings). If the specific posture changes, the directional indications will also change accordingly.

[0025] The utility model provides a circuit breaker.

[0026] In the embodiment, with reference to Figures 1-4 , the circuit breaker comprises a housing 2 with an arc-extinguishing chamber 1 and an electromagnetic assembly, the electromagnetic assembly comprises a coil framework 3, a coil 4 and a magnetic yoke 5, the magnetic yoke 5 comprises a baffle part 6 and a supporting part 7 connected with the coil framework, and the baffle part is arranged between the arc-extinguishing chamber and the electromagnetic assembly.

[0027] In the above technical solution, the magnetic yoke is designed to comprise a baffle part and a supporting part, and the baffle part is arranged between the arc-extinguishing chamber and the electromagnetic assembly, so that the arc-extinguishing chamber and the space above are separated by the baffle part, the upward movement of the arc generated by the arc-extinguishing chamber is effectively blocked, the influence of the arc on the electromagnetic assembly is avoided, the stability and reliability of the work of the electromagnetic assembly are improved, the operation safety and product performance of the entire circuit breaker are improved, the spatial layout inside the circuit breaker is optimized, and the collaborative work between the components is more smooth.

[0028] Specifically, a positioning installation structure for positioning the magnetic yoke is arranged on the shell between the arc-extinguishing chamber and the electromagnetic assembly.

[0029] In the embodiment, the positioning installation structure is arranged on the shell between the arc-extinguishing chamber and the electromagnetic assembly, so that the magnetic yoke can be accurately and stably installed and positioned, and the magnetic yoke can always keep the correct position during the operation of the circuit breaker, effectively preventing problems such as arc blocking failure or interference with other components caused by displacement of the magnetic yoke, greatly improving the stability and reliability of the structure of the circuit breaker, reducing the risk of failure caused by unstable installation, and helping to maintain long-term stable operation of the circuit breaker.

[0030] Specifically, the positioning installation structure includes an upper step 8 and a lower step 9 arranged on the shell, and the baffle part is installed and clamped between the upper step and the lower step.

[0031] In the embodiment, the positioning installation structure uses the upper step and the lower step on the shell to install and clamp the baffle part of the magnetic yoke. This design not only has a simple and convenient installation method, facilitating assembly operation in the production and manufacturing process and reducing assembly cost and difficulty, but also provides good limiting and supporting effects through the step structure, thereby enhancing the stability of the magnetic yoke in the horizontal and vertical directions and effectively resisting displacement of the magnetic yoke caused by external factors such as vibration and impact during operation of the circuit breaker, thereby ensuring the effectiveness and durability of the magnetic yoke in blocking the arc.

[0032] Specifically, the height of the baffle part is not less than the height of the arc-extinguishing sheet in the arc-extinguishing chamber.

[0033] In the embodiment, the height of the baffle part is not less than the height of the arc-extinguishing sheet in the arc-extinguishing chamber, so that the arc can be effectively blocked in all directions, preventing the arc from escaping from above the arc-extinguishing sheet and rising to the electromagnetic assembly area, further improving the protection effect on the electromagnetic assembly, making the arc-extinguishing process more concentrated in the arc-extinguishing chamber, and being conducive to improving the arc-extinguishing efficiency and quality, reducing the thermal effect and electromagnetic interference of the arc on the surrounding components, and improving the electrical performance and safety performance of the circuit breaker as a whole.

[0034] Specifically, the support part is provided with a concave surface 10 for supporting the end part of the coil skeleton.

[0035] In the embodiment, the concave surface is arranged on the support part to support the end part of the coil skeleton, so that a stable and reliable connection structure can be formed between the coil skeleton and the magnetic yoke, and the installation precision and positional stability of the coil skeleton in the electromagnetic assembly can be ensured.

[0036] Specifically, the static contact 11 has a hook portion 12 bent to one side of the arc-extinguishing chamber.

[0037] In the embodiment, the static contact has a hook portion at one end which is bent towards the side of the arc extinguishing chamber. During the opening and closing operation of the circuit breaker, the hook portion helps to guide the arc into the arc extinguishing chamber, so that the arc can be captured and processed by the arc extinguishing chamber more quickly, thereby improving the starting speed and success rate of arc extinguishing, reducing the residence time of the arc near the contact, reducing the risk of contact ablation, prolonging the service life of the contact, and improving the arc extinguishing performance and the opening and closing reliability of the circuit breaker.

[0038] Specifically, the static contact has a connecting portion 13 at the end away from the hook portion, the connecting portion 13 is provided with a connecting protrusion 14, one end of the baffle portion is extended with a connecting portion 15, and the connecting portion 15 is provided with a connecting through hole 16 connected with the connecting protrusion.

[0039] In the embodiment, the static contact is connected with the connecting portion of the yoke baffle portion through the connecting protrusion on the connecting portion and the connecting through hole on the connecting portion, forming a stable and tight connection relationship, enhancing the mechanical integrity between the static contact and the yoke, so that they can better cooperate with each other during the operation of the circuit breaker and jointly cope with various mechanical and electrical effects during the generation and extinction of the arc, thereby improving the stability and reliability of the internal structure of the circuit breaker. In addition, this connection method is convenient for assembly and maintenance, and reduces the production and after-sales costs. In order to improve the connection stability, the connecting protrusion and the connecting through hole are connected and then welded.

[0040] Skilled persons should know that although the utility model has been described according to the above specific embodiments, the utility model is not limited to the utility model, and any modification using the utility model will be included in the scope of protection of the patent.

Claims

1. A circuit breaker comprising a housing having an arc chamber and an electromagnetic assembly comprising a coil former, a coil and a magnetic yoke, characterized in that: The magnetic yoke comprises a baffle part and a supporting part connected with the coil frame, and the baffle part is arranged between the arc extinguishing chamber and the electromagnetic assembly.

2. The circuit breaker of claim 1, wherein: A positioning installation structure for positioning the magnetic yoke is arranged on the shell between the arc extinguishing chamber and the electromagnetic assembly.

3. The circuit breaker of claim 2, wherein: The positioning installation structure comprises upper and lower steps arranged on the shell, and the baffle part is installed and clamped between the upper and lower steps.

4. The circuit breaker of claim 1, wherein: The height of the baffle part is not lower than the height of the arc extinguishing sheet in the arc extinguishing chamber.

5. The circuit breaker of claim 1, wherein: A concave surface for supporting the end of the coil frame is arranged on the supporting part.

6. The circuit breaker of claim 1, wherein: A static contact is further arranged, and one end of the static contact has a hook part bent to one side of the arc extinguishing chamber.

7. The circuit breaker of claim 6, wherein: The end of the static contact away from the hook part has a connecting part connected with the baffle part, and the connecting part is provided with a connecting convex point. One end of the baffle part extends a connecting part, and the connecting part is provided with a connecting through hole connected with the connecting convex point.

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