A circuit breaker short-circuit protection device and a plug-in circuit breaker

Abstract

The present invention relates to a short-circuit protection device for a circuit breaker and a plug-in circuit breaker. The short-circuit protection device for the circuit breaker includes an electromagnetic tripping module and an arc extinguishing module. The arc extinguishing module is installed on one side of the electromagnetic tripping module. It is characterized in that the arc extinguishing module includes a static contact, an arc guiding angle component, a static arc angle component, and an arc extinguishing chamber. The opening of the arc extinguishing chamber faces the electromagnetic tripping module. The arc guiding angle component is installed at the upper end of the arc extinguishing chamber and bends downward above the opening of the arc extinguishing chamber to form an arc guiding angle. The static arc angle component is installed at the lower end of the arc extinguishing chamber and bends upward below the opening of the arc extinguishing chamber to form a static arc angle. The positions of the arc guiding angle and the static arc angle correspond to each other. One end of the static contact extends into the static arc angle, and the other end is connected to the electromagnetic tripping module. Compared with the prior art, the present invention can significantly improve the breaking capacity of the circuit breaker.

Description

Technical Field

[0001] The present invention relates to the technical field of circuit breakers, and more particularly to a short-circuit protection device for a circuit breaker and a plug-in circuit breaker. Background Art

[0002] In recent years, plug-in circuit breakers have been increasingly widely used. Especially with the rapid development of the 5G industry, the demand for 5G cabinets is increasing, and the plug-in circuit breakers used in conjunction with them have received more and more attention from manufacturers. At present, due to their unique shape and size limitations, most plug-in circuit breakers have limited breaking capacity and low reliability of breaking capacity. Summary of the Invention

[0003] The purpose of the present invention is to overcome the above-mentioned defects existing in the prior art and provide a short-circuit protection device for a circuit breaker and a plug-in circuit breaker.

[0004] The purpose of the present invention can be achieved by the following technical solutions:

[0005] A short-circuit protection device for a plug-in circuit breaker includes an electromagnetic tripping module and an arc extinguishing module. The arc extinguishing module is installed on one side of the electromagnetic tripping module. It is characterized in that the arc extinguishing module includes a static contact, an arc guiding angle component, a static arc angle component and an arc extinguishing chamber. The opening of the arc extinguishing chamber faces the electromagnetic tripping module. The arc guiding angle component is installed at the upper end of the arc extinguishing chamber and bends downward above the opening of the arc extinguishing chamber to form an arc guiding angle. The static arc angle component is installed at the lower end of the arc extinguishing chamber and bends upward below the opening of the arc extinguishing chamber to form a static arc angle. The arc guiding angle and the static arc angle are corresponding to each other in position. One end of the static contact extends into the static arc angle, and the other end is connected to the electromagnetic tripping module.

[0006] Further, the angle range of the arc guiding angle is 110 to 145 degrees.

[0007] Further, the angle range of the static arc angle is 110 to 140 degrees.

[0008] Further, the electromagnetic tripping module includes an iron core assembly, a coil and a yoke bracket. The iron core assembly is installed on the yoke bracket. The yoke bracket includes a top plate, a bottom plate and two side plates. The iron core assembly is installed across the two side plates. The coil is wound outside the iron core assembly. The top plate and the bottom plate are respectively located above and below the iron core assembly. One end of the coil is connected to the static contact.

[0009] Further, in the yoke bracket, a first avoidance notch is provided on one side of the top plate for passing through one end of the coil, and a second avoidance notch is provided on the side plate close to the arc extinguishing module for passing through the other end of the coil. At the same time, the end of the coil passing through the second avoidance notch is directly welded to the static contact to form an integral body.

[0010] Further, in the yoke bracket, the widths of the top plate and the bottom plate are both greater than the total width of the iron core assembly after winding the coil.

[0011] Further, the static contact includes a contact point, and a coil welding part, a static point welding part and an arc ignition part which are connected in sequence. The contact point is installed on the static point welding part. A first included angle is formed by bending downward at the connection between the coil welding part and the static point welding part. A second included angle is formed by bending upward at the connection between the static point welding part and the arc ignition part. The arc ignition part includes a front end part and a rear end part. A third included angle is formed by bending downward at the connection between the front end part and the rear end part. The front end part is connected to the static point welding part, and the rear end part extends into the static arc angle.

[0012] Further, the angle range of the second included angle is 150 to 170 degrees.

[0013] Further, the static contact and the arc ignition angle component are integrally formed parts.

[0014] An insertion type circuit breaker includes the short - circuit protection device of the insertion type circuit breaker as described in any one of the above.

[0015] Compared with the prior art, the present invention has the following advantages:

[0016] 1. The present invention sets an arc ignition angle and a static arc angle corresponding in position above and below the opening of the arc extinguishing chamber, and one end of the static contact extends into the static arc angle, which is beneficial to the generated arc moving towards the arc extinguishing chamber direction and accelerating its speed of entering the arc extinguishing chamber.

[0017] 2. The yoke bracket includes a top plate, a bottom plate and two side plates, a total of four structural surfaces, which can greatly reduce the magnetic flux reluctance, increase the electromagnetic force generated by the current passing through the coil, thereby improving the magnetic tripping speed of the electromagnetic tripping module, reducing the action time and improving the breaking capacity.

[0018] 3. The yoke bracket is provided with a first avoidance notch and a second avoidance notch, and both ends of the coil pass through the two avoidance notches respectively; at the same time, the end of the coil passing through the second avoidance notch is directly welded to the static contact to form a whole. This structure simplifies the existing structure of welding the coil and the static contact on the yoke bracket, reduces the overall resistance, increases the limit current; at the same time, separates the yoke bracket and the coil static contact assembly, making the product easier to install and manufacture and improving the production efficiency.

[0019] 4. The static contact includes a coil welding part, a static spot welding part, and an arc-igniting part that are connected at an angle to each other. The arc-igniting part is bent by itself to form a front end part and a rear end part. The front end part forms a certain angle with the static spot welding surface, reducing the step between the plane of the arc-igniting part and the contact plane on the static spot welding part, which is beneficial to the rapid jump of the arc. The angle setting between the front end part and the rear end part enables the rear end part to extend into the static arc angle. On the one hand, it is beneficial to the emission and reception of the arc. On the other hand, it can reduce the reflux of high-temperature gas, reduce the breakdown phenomenon behind the arc extinguishing chamber, and improve the breaking capacity of the product.

[0020] 5. The static contact and the arc-igniting angle component are integrally formed parts, which further accelerate the arc jump speed, improve the breaking capacity, and simplify the product structure. BRIEF DESCRIPTION OF THE DRAWINGS

[0021] Figure 1 It is a schematic structural diagram of the present invention.

[0022] Figure 2 It is a schematic structural diagram of the electromagnetic tripping module.

[0023] Figure 3 It is a schematic structural diagram of the arc extinguishing module.

[0024] Figure 4 It is a schematic structural diagram of the yoke bracket.

[0025] Figure 5 It is a schematic structural diagram of the static contact.

[0026] REFERENCE NUMERALS:

[0027] 1. Electromagnetic tripping module, 11. Iron core assembly, 12. Coil, 13. Yoke bracket, 13a. Top plate, 13b. Bottom plate, 13c. Two side plates, 13d. First avoidance notch, 13e. Second avoidance notch;

[0028] 2. Arc extinguishing module, 21. Static contact, 21a. Contact point, 21b. Coil welding part, 21c. Static spot welding part, 21d. Arc-igniting part, 21d-1. Front end part, 21d-2. Rear end part, 22. Arc-igniting angle component, 22a. Arc-igniting angle, 23. Static arc angle component, 23a. Static arc angle, 24. Arc extinguishing chamber. DETAILED DESCRIPTION OF THE EMBODIMENTS

[0029] The present invention will be described in detail below with reference to the drawings and specific embodiments. This embodiment is implemented on the premise of the technical solution of the present invention, and the detailed implementation manners and specific operation processes are given, but the protection scope of the present invention is not limited to the following embodiments.

[0030] As Figures 1 to 3As shown in the figure, this embodiment provides a short - circuit protection device for a circuit breaker, which includes an electromagnetic tripping module 1 and an arc - extinguishing module 2. The arc - extinguishing module 2 is installed on the right side of the electromagnetic tripping module 1. Specifically:

[0031] The electromagnetic tripping module 1 includes an iron - core assembly 11, a coil 12, and a yoke bracket 13. The iron - core assembly 11 is installed on the yoke bracket 13. As Figure 4 shown, the yoke bracket 13 includes a top plate 13a, a bottom plate 13b, and two side plates 13c, forming a rectangular loop. The iron - core assembly 11 is horizontally installed on the two side plates 13c, and the top plate 13a and the bottom plate 13b are respectively located above and below the iron - core assembly 11. The coil 12 is wound outside the iron - core assembly 11. The left end of the coil 12 is connected to a wiring board, and the right end of the coil 12 is connected to one end of the arc - extinguishing module 2. The yoke bracket 13 is integrally formed by stamping a metal base material. In the yoke bracket 13, a first avoidance notch 13d is provided on one side of the top plate 13a for passing through the left end of the coil 12, and a second avoidance notch 13e is provided on the side plate 13c near the arc - extinguishing module 2 on the right for passing through the right end of the coil 12. The widths of the top plate 13a and the bottom plate 13b are both greater than the total width of the iron - core assembly 11 after winding the coil 12. This structure simplifies the existing structure of welding the static contact 21 of the coil 12 on the yoke bracket 13, reduces the overall resistance, and increases the limit current.

[0032] The arc - extinguishing module 2 includes a static contact 21, an arc - guiding angle component 22, a static arc - angle component 23, and an arc - extinguishing chamber 24. The arc - extinguishing chamber 24 opens towards the electromagnetic tripping module 1. The arc - guiding angle component 22 is installed at the upper end of the arc - extinguishing chamber 24 and bends downward above the opening of the arc - extinguishing chamber 24 to form an arc - guiding angle 22a. The static arc - angle component 23 is installed at the lower end of the arc - extinguishing chamber 24 and bends upward below the opening of the arc - extinguishing chamber 24 to form a static arc - angle 23a. The bending positions of the arc - guiding angle component 22 and the static arc - angle component 23 correspond to each other, that is, the arc - guiding angle and the static arc - angle 23a are in corresponding positions. The correspondingly positioned arc - guiding angle 22a and static arc - angle 23a are beneficial for the generated arc to move towards the arc - extinguishing chamber 24, accelerating its speed of entering the arc - extinguishing chamber 24. The angle range of the arc - guiding angle 22a is generally 110 - 145 degrees, and the angle range of the static arc - angle 23a is generally 110 - 140 degrees, which can play the best role in guiding the arc. In this embodiment, specifically, the arc - guiding angle 22a is 120 degrees and the static arc - angle 23a is 120 degrees.

[0033] The left end of the static contact 21 is directly welded to the right end of the coil 12, and the right end of the static contact 21 extends into the static arc angle 23a. The left end of the static contact 21 and the right end of the coil 12 are welded to form a whole. This structure simplifies the existing structure where the yoke bracket 13 needs to weld the static contact 21 of the coil 12 at the same time, reduces the overall resistance, and increases the limiting current; at the same time, the coil 12 and the coil static contact assembly are separated, making the product easier to install and manufacture, and improving the production efficiency.

[0034] In another embodiment, the right end of the static contact 21 and the static arc angle component 23 can be integrally formed parts, which are used to further accelerate the arc jumping speed, improve the breaking capacity, and simplify the product structure.

[0035] As Figure 5 shown, the static contact 21 includes a contact 21a, and a coil welding part 21b, a static point welding part 21c, and an arc leading part 21d that are connected in sequence. The contact 21a is installed on the static point welding part 21c. The connection between the coil welding part 21b and the static point welding part 21c is bent downward to form a first included angle I, and the angle range of the first included angle I is generally 90 to 130 degrees, and 110 degrees is adopted in this embodiment. The connection between the static point welding part 21c and the arc leading part 21d is bent upward to form a second included angle II; the angle range of the second included angle II is generally 150 to 170 degrees, and 160 degrees is adopted in this embodiment. The arc leading part 21d itself is bent downward to form a front end part 21d-1 and a rear end part 21d-2 that are connected to each other at a third included angle III. The angle range of the third included angle III is generally 110 to 150 degrees, and 130 degrees is adopted in this embodiment. The front end part 21d-1 is connected to the static point welding part 21c, and the rear end part 21d-2 extends into the static arc angle 23a. The setting of the second included angle II reduces the step between the plane of the arc leading part 21d and the plane of the contact 21a on the static point welding part 21c, which is beneficial to the rapid jump of the arc; the setting of the third included angle III makes the rear end part 21d-2 extend into the static arc angle 23a. On the one hand, it is beneficial to the emission and reception of the arc, and on the other hand, it can reduce the reflux of high-temperature gas, reduce the breakdown phenomenon behind the arc extinguishing chamber 24, and improve the breaking capacity of the product. At the same time, the front end part 21d-1 of the arc leading part 21d can be parallel to the upper side edge of the arc leading angle 22a, which is more beneficial to the jump and elongation of the arc.

[0036] The working principle of this embodiment is:

[0037] The circuit breaker where the short-circuit protection device of the circuit breaker is located also has an operating mechanism 3, and a moving contact 31 is provided on the operating mechanism. When the circuit breaker is closed, the moving contact 31 and the static contact 21 remain connected. When current passes through the coil 12 to generate a magnetic field, the push rod in the iron core assembly 11 moves to push the operating mechanism 3, so that the moving contact 31 and the static contact 21 are separated. At this time, an arc will be generated between the moving contact 31 and the static contact 21. The arc moves along the front end 21d-1 of the static contact 21 from the contact point 21a, and continues to elongate, and finally enters the arc extinguishing chamber 24 to be extinguished, completing the short-circuit protection.

[0038] The preferred specific embodiments of the present invention have been described in detail above. It should be understood that those of ordinary skill in the art can make many modifications and variations according to the concept of the present invention without creative work. Therefore, all technical solutions that can be obtained by those skilled in the art in the technical field of the present invention based on the concept of the present invention through logical analysis, reasoning or limited experiments on the basis of the prior art should be within the protection scope determined by the claims.

Claims

1. A short-circuit protection device for a plug-in circuit breaker, comprising an electromagnetic tripping module (1) and an arc extinguishing module (2), wherein the arc extinguishing module (2) is installed on one side of the electromagnetic tripping module (1), and is characterized in that, The arc extinguishing module (2) includes a static contact (21), an arc leading angle component (22), a static arc angle component (23) and an arc extinguishing chamber (24). The arc extinguishing chamber (24) opens towards the electromagnetic tripping module (1). The arc leading angle component (22) is installed at the upper end of the arc extinguishing chamber (24) and bends downward above the opening of the arc extinguishing chamber (24) to form an arc leading angle (22a). The static arc angle component (23) is installed at the lower end of the arc extinguishing chamber (24) and bends upward below the opening of the arc extinguishing chamber (24) to form a static arc angle (23a). The positions of the arc leading angle (22a) and the static arc angle (23a) correspond to each other. One end of the static contact (21) extends into the static arc angle (23a), and the other end is connected to the electromagnetic tripping module (1). The electromagnetic tripping module (1) includes an iron core assembly (11), a coil (12) and a yoke support (13). The iron core assembly (11) is installed on the yoke support (13). The yoke support (13) includes a top plate (13a), a bottom plate (13b) and two side plates (13c). The iron core assembly (11) is installed across the two side plates (13c). The coil (12) is wound outside the iron core assembly (11). The top plate (13a) and the bottom plate (13b) are respectively located above and below the iron core assembly (11). One end of the coil (12) is connected to the static contact (21). The yoke support (13) is a four-sided surrounding structure. A relative inclination angle is formed and arranged relatively between the electromagnetic tripping module (1) and the operating mechanism (3). The static contact (21) includes a contact point (21a), and a coil welding part (21b), a static point welding part (21c) and an arc leading part (21d) which are connected in sequence. The contact point (21a) is installed on the static point welding part (21c). A first included angle is formed by downward bending at the connection between the coil welding part (21b) and the static point welding part (21c). A second included angle is formed by upward bending at the connection between the static point welding part (21c) and the arc leading part (21d). The arc leading part (21d) includes a front end part (21d-1) and a rear end part (21d-2). A third included angle is formed by downward bending at the connection between the front end part (21d-1) and the rear end part (21d-2). The front end part (21d-1) is connected to the static point welding part (21c), and the rear end part (21d-2) extends into the static arc angle (23a). The angle range of the first included angle is 90 to 130 degrees; the angle range of the third included angle is 110 to 150 degrees. The angle range of the second included angle is 150 to 170 degrees.

2. The short-circuit protection device of a plug-in circuit breaker according to claim 1, characterized in that, The angle range of the arc leading angle (22a) is 110 to 145 degrees.

3. The short-circuit protection device of a plug-in circuit breaker according to claim 1, characterized in that, The angle range of the static arc angle (23a) is 110 to 140 degrees.

4. The short-circuit protection device of a plug-in circuit breaker according to claim 1, characterized in that, In the yoke bracket (13), a first avoidance notch (13d) is provided on one side of the top plate (13a) for passing through one end of the coil (12), and a second avoidance notch (13e) is provided on the side plate (13c) close to the arc extinguishing module (2) for passing through the other end of the coil (12). At the same time, the end of the coil passing through the second avoidance notch (13e) is directly welded to the static contact (21) to form an integral body.

5. The short-circuit protection device of a plug-in circuit breaker according to claim 1, characterized in that, In the yoke bracket (13) described above, the widths of the top plate (13a) and the bottom plate (13b) are both greater than the total width of the iron core assembly (11) after winding the coil (12).

6. The short-circuit protection device of a plug-in circuit breaker according to claim 1, characterized in that, The static contact (21) and the static arc angle component (23) are integrally formed parts.

7. An insertion-type circuit breaker, characterized in that, It includes a short-circuit protection device for the plug-in circuit breaker according to any one of claims 1 to 6.

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