A high magnetic efficiency miniature circuit breaker snap-on electromagnetic system

Abstract

The application discloses a small-sized circuit breaker clapping type electromagnetic system with high magnetic efficiency, which comprises a magnetic yoke, and a armature is arranged above the magnetic yoke; the armature comprises a shaft pin part and a magnetic concentration part, and a recess part is further arranged on the magnetic concentration part; wherein the recess part is recessed towards the magnetic yoke. In summary, without reducing the magnetic increase of the magnetic yoke to the static contact rod, the recess part is arranged in the normal working air gap path of the armature, the distance from the current conductor is reduced, the electromagnetic force is larger and more concentrated in the working air gap, the magnetic path surface is larger, the suction is sufficient under low current (such as 32A and below), the action is sensitive, the magnetic flux leakage is minimum, and the large current working condition is considered.

Description

Technical Field

[0001] This invention relates to the field of circuit breaker technology, specifically to a high-magnetic-efficiency miniature circuit breaker snap-action electromagnetic system. Background Technology

[0002] Currently, most high-current miniature circuit breakers in the industry use coil-type electromagnetic systems due to size limitations, which can lead to problems such as temperature rise, spot welding, complex installation processes, and high costs. However, these systems generally suffer from low magnetic efficiency and severe magnetic leakage, and can only be used in high-current specifications. Current specifications of 32A and below cannot be used. Summary of the Invention

[0003] The purpose of this invention is to provide a high-magnetic-efficiency miniature circuit breaker snap-action electromagnetic system to solve the problems mentioned in the background art.

[0004] To achieve the above objectives, the present invention provides the following technical solution: a high magnetic efficiency miniature circuit breaker snap-action electromagnetic system, comprising a magnetic yoke, and an armature mounted above the magnetic yoke; the armature comprises a pivot pin portion and a magnetic focusing portion, and the magnetic focusing portion is further provided with a recessed portion; wherein the recessed portion is recessed in the direction of the magnetic yoke.

[0005] As a preferred embodiment of the present invention: the distance between the top surface of the recess and the lower surface of the armature is a, and the distance between the bottom surface of the recess and the upper surface of the armature is b; wherein, a < b, and b ÷ a = 1.5.

[0006] As a preferred embodiment of the present invention, the shaft pin portion and the magnetizing portion are connected by a connecting portion, and the width of the connecting portion is smaller than the width of the magnetizing portion.

[0007] As a preferred technical solution of the present invention: the shaft pin portion is further provided with a through hole, and the through hole is opened on the width surface of the shaft pin portion.

[0008] The beneficial effects of the present invention by adopting the above technical solution are as follows: without reducing the amount of magnetization of the static contact rod by the yoke, the recessed part is set in the normal working air gap path of the armature, reducing the distance with the current-carrying conductor, so that the electromagnetic force is greater and more concentrated in the working air gap, and the magnetic surface is larger, so as to achieve sufficient attraction force, sensitive action and minimal leakage magnetic field under low current (such as 32A and below), while also taking into account high current conditions. Attached Figure Description

[0009] Figure 1 This is a schematic diagram of the main structure of the present invention;

[0010] Figure 2 This is a schematic diagram of the main structure of the armature of the present invention;

[0011] Figure 3 This is a schematic cross-sectional view of the armature structure of the present invention;

[0012] Figure 4 The electromagnetic field magnetic induction intensity vector distribution diagram for armatures without recesses;

[0013] Figure 5 A vector distribution diagram of the electromagnetic field magnetic induction intensity of the armature with a recess;

[0014] Figure 6 Figure showing the electromagnetic torque analysis results of electromagnetic field simulation for armatures without recesses;

[0015] Figure 7 The electromagnetic field magnetic induction intensity vector result diagram for armature without recesses;

[0016] Figure 8 Figure showing the results of electromagnetic torque analysis in electromagnetic field simulation for an armature with a recessed portion;

[0017] Figure 9 A vector diagram showing the electromagnetic field magnetic induction intensity of the armature with a recessed portion;

[0018] Figure 10 This is a schematic diagram showing the position of the magnetizing part on the armature.

[0019] In the figure: 1. Magnetic yoke; 2. Armature; 20. Shaft pin; 21. Through hole; 22. Connecting part; 23. Recessed part; 24. Magnetizing part. Detailed Implementation

[0020] The embodiments of the present invention are described in detail below. Examples of these embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention. In the description of the present invention, it should be understood that the terms "upper," "lower," "front," "upper surface," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as limiting the present invention.

[0021] Please see Figure 1-10This invention provides an embodiment of a high-magnetic-efficiency miniature circuit breaker snap-action electromagnetic system, comprising a magnetic yoke 1 and an armature 2 mounted above the magnetic yoke 1; the armature 2 includes a pin portion 20 and a magnetic focusing portion 24, and the magnetic focusing portion 24 is further provided with a recessed portion 23; wherein, the recessed portion 23 is recessed towards the magnetic yoke 1. In summary, without reducing the amount of magnetization of the stationary contact rod by the magnetic yoke 1, the recessed portion 23 is located within the normal working air gap path of the armature 2, reducing the distance to the current-carrying conductor, resulting in a larger and more concentrated electromagnetic force within the working air gap, and a larger magnetic surface area, achieving sufficient attraction force at low currents (such as 32A and below), sensitive operation, and minimal magnetic leakage, while also taking into account high current conditions.

[0022] Specifically, such as Figure 3 As shown, the distance 'a' between the recessed portion 23 and the lower surface of the armature 2, and the distance 'b' between the bottom surface of the recessed portion 23 and the upper surface of the armature 2; where a < b, and b ÷ a = 1.5. Therefore, while preventing the armature 2 from colliding with the stationary contact rod, the power of the armature 2 during engagement can be increased, thereby enabling the system to have reliable breaking capacity in circuit breakers of 32A and below.

[0023] like Figure 2 and Figure 10 As shown, the shaft pin 20 and the magnetic focusing part 24 are connected by a connecting part 22, and the width of the connecting part 22 is smaller than the width of the magnetic focusing part 24. This allows the electromagnetic field to be concentrated in the magnetic focusing part 24, reducing electromagnetic leakage to the shaft pin 20, thereby making the magnetic force of the magnetic focusing part 24 stronger and improving the breaking capacity of the circuit breaker. In addition, the narrower the connecting part 22, the lower the weight of the armature 2. The smaller the width of the connecting part 22, the better, while ensuring that the shaft pin 20 and the magnetic focusing part 24 do not deform.

[0024] Similarly, the pin portion 20 is also provided with a through hole 21, and the through hole 21 is opened on the width surface of the pin portion 20, thereby making the magnetic force incomplete. This reduces the weight of the armature 2 and reduces magnetic leakage. Since the magnetic leakage can be reduced, the snapping action of the armature 2 is stronger, so as to solve the problem of weak snapping action caused by insufficient electromagnetic strength in 32A and below circuit breakers.

[0025] For further comparison and explanation of the system, please refer to... Figure 4 , Figure 5 , Figure 6 and Figure 7 As shown, taking an 80A product as an example: the input rated current is 80A × 7 (instantaneous multiple) × 1.4 (sine AC effective value to peak value coefficient) = 784A.

[0026] like Figure 6 and Figure 7 As shown, without the recess 23, the value of the electromagnetic torque analysis result of the electromagnetic field simulation is 69.126.

[0027] like Figure 8 and Figure 9 As shown, with the recess 23, the electromagnetic torque analysis value of the electromagnetic field simulation is 85.933; thus, the setting of the recess 23 can effectively improve the electromagnetic strength, thereby ensuring that the armature 2's snapping action is strong and powerful.

[0028] Depend on Figure 4 As shown, when the armature 2 does not have a recessed portion, its electromagnetic field magnetic induction intensity vector has a significant magnetic crossover of the upper surface of the armature 2, and part of the magnetic field leaks in the direction of the shaft pin portion 20, thus showing a significant magnetic leakage phenomenon.

[0029] Depend on Figure 5 As shown, when the armature 2 has a recessed portion, its electromagnetic field magnetic induction intensity vector does not significantly cross the upper surface of the armature 2, and there is less magnetic leakage in the direction of the shaft pin portion 20, thus effectively reducing the magnetic leakage phenomenon.

[0030] In summary, through the above analysis and comparison, since the recessed part 23 is located in the normal working air gap path of the armature 2, the distance to the current-carrying conductor is reduced, resulting in a larger electromagnetic force that is more concentrated in the working air gap. At the same time, the magnetic surface is larger, which can achieve sufficient attraction force under low current (such as 32A and below), sensitive action, and minimal leakage magnetic field, while also taking into account high current conditions.

[0031] The embodiments of the present invention have been described in detail above with reference to the accompanying drawings, but the present invention is not limited to the described embodiments. For those skilled in the art, various changes, modifications, substitutions, and variations can be made to these embodiments without departing from the principles and spirit of the present invention, and these variations still fall within the protection scope of the present invention.

Claims

1. A high-magnetic-efficiency miniature circuit breaker snap-action electromagnetic system, characterized in that: It includes a magnetic yoke (1) and an armature (2) is mounted above the magnetic yoke (1); The armature (2) includes a pivot pin portion (20) and a magnetizing portion (24), and the magnetizing portion (24) is further provided with a recessed portion (23); wherein the recessed portion (23) is recessed in the direction of the magnetic yoke (1); The distance between the top surface of the recess (23) and the lower surface of the armature (2) is a, and the distance between the bottom surface of the recess (23) and the upper surface of the armature (2) is b; where a < b, and b ÷ a = 1.5; The pin portion (20) is also provided with a through hole (21), and the through hole (21) is opened on the width surface of the pin portion (20).

2. The high magnetic efficiency miniature circuit breaker snap-action electromagnetic system according to claim 1, characterized in that: The pin portion (20) and the magnetizing portion (24) are connected by a connecting portion (22), and the width of the connecting portion (22) is smaller than the width of the magnetizing portion (24).

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