Circuit breaker

Abstract

The embodiment of the utility model provides a circuit breaker. The circuit breaker comprises a moving contact; the static contact comprises a bending part and a static contact point, the bending part forms an installation space, and the static contact point is arranged on the bending part; the arc striking sheet is separated from the static contact and is arranged around at least part of the outer side surface of the static contact; at least part of the permanent magnet is located in the mounting space; the electromagnet is at least partially located in the installation space and comprises an iron core and a coil arranged around the iron core, one end of the coil is connected to the bending part, and the other end of the coil is connected to the arc striking piece; the arc extinguish chamber is adjacent to one end, deviating from the static contact, of the arc striking sheet, under the condition that the moving contact moves deviating from the static contact and an electric arc is generated between the moving contact and the static contact, the electric arc is guided to the arc striking sheet by the permanent magnet, and the coil is electrified to generate a magnetic field which guides the electric arc guided to the arc striking sheet towards the arc extinguish chamber.

Description

Technical Field

[0001] Embodiments of the present disclosure generally relate to the technical field of electrical equipment, and more particularly, to a circuit breaker. Background Art

[0002] With the continuous increase in the DC application voltage level, the breaking capacity requirements for circuit breakers are also getting higher and higher. During the operation of a circuit breaker, an arc is likely to be generated between the moving and static contacts.

[0003] In a conventional circuit breaker, in order to eliminate the arc, structures such as a permanent magnet and an arc extinguishing chamber are required. The magnetic field generated by the permanent magnet can exert a magnetic blowing force on the arc and drive the arc into the arc extinguishing chamber, thereby achieving the effect of arc extinguishing. However, for a circuit breaker with a large current rating, the arc extinguishing effect of the permanent magnet is limited. Summary of the Utility Model

[0004] The object of the present disclosure is to provide a circuit breaker to at least partially solve the above problems.

[0005] In one aspect of the present disclosure, there is provided a circuit breaker, which includes: a moving contact; a static contact including a bent portion and a static contact point, the bent portion forms an installation space, and the static contact point is provided on the bent portion; an arc guiding piece spaced apart from the static contact and disposed around at least a part of the outer side surface of the static contact point; a permanent magnet, at least partially located in the installation space; an electromagnet, at least partially located in the installation space and including an iron core and a coil wound around the iron core, one end of the coil is connected to the bent portion, and the other end of the coil is connected to the arc guiding piece; and an arc extinguishing chamber adjacent to one end of the arc guiding piece facing away from the static contact point, wherein when the moving contact moves away from the static contact point and an arc is generated between the moving contact and the static contact point, the arc is guided by the permanent magnet to the arc guiding piece, and the coil is energized to generate a magnetic field that guides the arc to be guided to the arc guiding piece toward the arc extinguishing chamber.

[0006] According to an embodiment of the present disclosure, when the permanent magnet guides the arc foot of the arc to the arc guiding piece, the coil is energized and generates a strong magnetic field to smoothly blow the arc into the arc extinguishing chamber. Therefore, for a circuit breaker with a large current rating, the arc extinguishing effect is obvious.

[0007] In some embodiments, the arc guiding piece includes a clamping portion and a guiding portion, the clamping portion is disposed around at least a part of the outer side surface of the static contact point and is spaced apart from the static contact point, and the guiding portion is adjacent to the arc extinguishing chamber.

[0008] In some embodiments, the circuit breaker further includes a pair of magnetic conductive members. Each of the pair of magnetic conductive members includes a mounting portion and an extending portion. The mounting portions of the pair of magnetic conductive members are each connected to the iron core, and the extending portions of the pair of magnetic conductive members extend toward the stationary contact and are disposed on opposite sides of the stationary contact.

[0009] In some embodiments, the bent portion includes a first portion, a second portion, and a third portion. The first portion includes a mounting surface for disposing the stationary contact. The third portion is disposed away from the stationary contact, and the second portion is bent and disposed between the first portion and the third portion.

[0010] In some embodiments, when the coil is energized, the direction of the current flowing through the coil is the same as the direction of the current flowing through the second portion.

[0011] In some embodiments, the mounting portion of one of the pair of magnetic conductive members is connected to one end face of the iron core, and the mounting portion of the other of the pair of magnetic conductive members is connected to the other end face of the iron core.

[0012] In some embodiments, the permanent magnet is located on a side of the electromagnet away from the arc extinguishing chamber, and the electromagnet is located between the arc initiating piece and the third portion.

[0013] In some embodiments, the mounting portions of the pair of magnetic conductive members are each disposed on a side of the iron core adjacent to the stationary contact.

[0014] In some embodiments, the permanent magnet is located on a side of the electromagnet away from the arc extinguishing chamber, and the electromagnet is located between the first portion and the third portion.

[0015] In some embodiments, the circuit breaker further includes an insulating member, and a part of the insulating member is disposed between the mounting surface and the arc initiating piece.

[0016] It should be understood that the content described in this part is not intended to define the key features or important features of the embodiments of the present disclosure, nor is it used to limit the scope of the present disclosure. Other features of the present disclosure will become readily understood through the following description. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In conjunction with the accompanying drawings and with reference to the following detailed description, the above and other features, advantages, and aspects of the embodiments of the present disclosure will become more apparent. In the drawings, the same or similar reference numerals denote the same or similar elements, where:

[0018] Figure 1 shows a schematic structural diagram of a circuit breaker according to some embodiments of the present disclosure;

[0019] Figure 2 shows a schematic structural diagram of a circuit breaker according to Figure 1 shown, where the paired magnetic conductive members are not shown;

[0020] Figure 3 shows a schematic structural diagram of a static contact, an arc ignition piece, a permanent magnet, an electromagnet, and paired magnetic conductive members according to some embodiments of the present disclosure;

[0021] Figure 4 shows Figure 3 a top view of the static contact, the arc ignition piece, the permanent magnet, the electromagnet, and the paired magnetic conductive members shown;

[0022] Figure 5 shows a schematic structural diagram of a static contact, an arc ignition piece, a permanent magnet, an electromagnet, and paired magnetic conductive members according to other embodiments of the present disclosure;

[0023] Figure 6 shows Figure 5 a schematic structural diagram of the static contact, the permanent magnet, and the electromagnet shown.

[0024] Description of reference numerals:

[0025] 100 is the circuit breaker, and 101 is the installation space;

[0026] 1 is the moving contact;

[0027] 2 is the static contact, 21 is the bent portion, 211 is the first part, 2111 is the installation surface, 212 is the second part, 213 is the third part, 22 is the connecting portion, and 23 is the static contact point;

[0028] 3 is the arc ignition piece, 31 is the clamping portion, and 32 is the guiding portion;

[0029] 4 is the permanent magnet;

[0030] 5 is the electromagnet, 51 is the iron core, and 52 is the coil;

[0031] 6 is the arc extinguishing chamber;

[0032] 7 is the magnetic conductive member, 71 is the installation portion, and 72 is the extending portion;

[0033] 8 is the insulating member. Detailed implementation manners

[0034] Hereinafter, the preferred embodiments of the present disclosure will be described in more detail with reference to the accompanying drawings. Although the preferred embodiments of the present disclosure are shown in the drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. On the contrary, these embodiments are provided to make the present disclosure more thorough and complete, and to fully convey the scope of the present disclosure to those skilled in the art.

[0035] As used herein, the term "including" and its variations mean open inclusion, i.e., "including but not limited to". Unless otherwise stated, the term "or" means "and / or". The term "based on" means "at least partially based on". The terms "an example embodiment" and "an embodiment" mean "at least one example embodiment". The term "another embodiment" means "at least one additional embodiment". The terms "first", "second", etc. may refer to different or the same objects.

[0036] As described above, in a conventional circuit breaker, in order to eliminate the arc, structures such as a permanent magnet and an arc extinguishing chamber are required. The magnetic field generated by the permanent magnet can generate a magnetic blowing force on the arc and drive the arc into the arc extinguishing chamber, thereby achieving the effect of arc extinguishing. However, for a circuit breaker with a large current rating, the arc extinguishing effect of the permanent magnet is limited. Embodiments of the present disclosure provide a circuit breaker 100, such as a DC circuit breaker, to at least partially solve the above problems. Hereinafter, the principle of the present disclosure will be described in conjunction with Figures 1 to 6 the drawings.

[0037] Figure 1 FIG. 11 shows a schematic structural diagram of a circuit breaker 100 according to some embodiments of the present disclosure. Figure 2 FIG. 12 shows a schematic structural diagram of the circuit breaker 100 according to Figure 1 FIG. 11, in which the pair of magnetic conductive members 7 are not shown to avoid blocking the internal components by the magnetic conductive members 7. As Figures 1 to 2 shown, the circuit breaker 100 described herein generally includes a moving contact 1, a static contact 2, an arc guide piece 3, a permanent magnet 4, an electromagnet 5, an arc extinguishing chamber 6, a pair of magnetic conductive members 7, and an insulating member 8.

[0038] Referring to Figures 1 to 2 FIG. 11, in some embodiments, the static contact 2 includes a bent portion 21, a connecting portion 22, and a static contact point 23. One end of the connecting portion 22 is connected to the bent portion 21, and the other end of the connecting portion 22 is connected to a wiring terminal (not shown in the figure). The static contact point 23 is disposed on the bent portion 21 and is disposed corresponding to the moving contact 1. Obviously, when the circuit breaker 100 is in the closed state, the moving contact 1 is connected to the static contact point 23, and the moving contact 1, the static contact point 23, the bent portion 21, and the connecting portion 22 form an electrical circuit. During the process of the circuit breaker 100 switching from the closed state to the open state, the moving contact 1 can move away from the static contact point 23 and generate an arc between the moving contact 1 and the static contact point 23.

[0039] Figure 3 FIG. 13 shows a schematic structural diagram of the static contact 2, the arc guide piece 3, the permanent magnet 4, the electromagnet 5, and the pair of magnetic conductive members 7 according to some embodiments of the present disclosure. Referring to Figures 1 to 3, in some embodiments, the arcing piece 3 and the static contact 2 are spaced apart from each other to prevent the arcing piece 3 from conducting with the static contact 2 when the circuit breaker 100 is in the closed state. The arcing piece 3 is disposed around at least a part of the outer side surface of the static contact point 23 to ensure that under different current directions, the arc feet of the arc can be guided from the static contact point 23 to the arcing piece 3 under the magnetic field of the permanent magnet 4.

[0040] Continue to refer to Figures 1 to 3 , in some embodiments, the bent portion 21 forms an installation space 101, and at least a part of the permanent magnet 4 and at least a part of the electromagnet 5 are located in the installation space 101. The electromagnet 5 includes an iron core 51 and a coil 52 disposed around the iron core 51. One end of the coil 52 is connected to the bent portion 21. Of course, one end of the coil 52 can also be connected to the connecting portion 22. The other end of the coil 52 is connected to the arcing piece 3. The arc extinguishing chamber 6 is adjacent to one end of the arcing piece 3 facing away from the static contact point 23.

[0041] With the above configuration, when an arc is generated between the moving contact 1 and the static contact point 23, the arc feet of the arc are guided to the arcing piece 3 under the magnetic field of the permanent magnet 4, so the moving contact 1 and the arcing piece 3 are conductively connected through the arc. Also, since the two ends of the coil 52 are respectively connected to the bent portion 21 and the arcing piece 3, the moving contact 1, the arcing piece 3, the coil 52, a part of the bent portion 21, and the connecting portion 22 form an electrical circuit, and the coil 52 can be energized and generate a magnetic field, so that the coil 52 is energized only when arc blowing is required. The iron core 51 further enhances the magnetic field intensity to guide the arc guided to the arcing piece 3 toward the arc extinguishing chamber 6, thereby achieving arc extinguishing.

[0042] In summary, according to the embodiments of the present disclosure, when the permanent magnet 4 guides the arc feet of the arc to the arcing piece 3, the coil 52 is energized and generates a strong magnetic field to smoothly blow the arc into the arc extinguishing chamber 6. Therefore, for a circuit breaker with a large current rating, the arc extinguishing effect is obvious. In addition, since the two ends of the coil 52 are respectively connected to the bent portion 21 and the arcing piece 3, the voltage of the coil 52 is equal to a section of the voltage between the arcing piece 3 and the static contact 2, so the current flowing through the coil 52 is limited, thus preventing the coil 52 from being burned out.

[0043] Figure 4 Shows Figure 3 A top view of the static contact 2, the arcing piece 3, the permanent magnet 4, the electromagnet 5, and the pair of magnetic conduction members 7 shown. Refer to Figures 3 to 4 , in some embodiments, the arcing piece 3 may include a clamping portion 31 and a guiding portion 32 connected to the clamping portion 31. The clamping portion 31 may be disposed around at least a part of the outer side surface of the static contact point 23 and spaced apart from the static contact point 23. The guiding portion 32 may be adjacent to the arc extinguishing chamber 6 to guide the arc toward the arc extinguishing chamber 6.

[0044] Continue to refer to Figures 3 to 4 , in some embodiments, the clamping portion 31 can be arranged around half of the outer side surface of the stationary contact 23 to ensure that the arc feet of the arc can be guided from the stationary contact 23 to the arc starting piece 3 under the magnetic field action of the permanent magnet 4 in the case of different current directions. In other embodiments, the clamping portion 31 can also be arranged around the entire outer side surface of the stationary contact 23.

[0045] Continue to refer to Figures 3 to 4 , further, the permanent magnet 4 can include 1 to 3 permanent magnets. The number of turns of the coil 52 can be adjusted according to the level of the product current. For example, the number of turns of the coil 52 can be 45 turns.

[0046] It should be noted that the numbers, numerical values, quantities, etc. mentioned above and elsewhere in the present disclosure are all exemplary and are not intended to limit the scope of the present disclosure in any way. Any other appropriate numbers, numerical values, quantities are possible. For example, according to specific application scenarios and requirements, the clamping portion 31 can also be arranged around more or less parts of the outer side surface of the stationary contact 23.

[0047] Continue to refer to Figures 3 to 4 , in some embodiments, the pair of magnetic conductive members 7 can each include a mounting portion 71 and an extending portion 72. The mounting portions 71 of the pair of magnetic conductive members 7 can each be connected to the iron core 51. The extending portions 72 of the pair of magnetic conductive members 7 can extend toward the direction of the stationary contact 23 and be arranged on the opposite sides of the stationary contact 23. Thus, when the coil 52 is energized, a magnetic field is also formed between the pair of magnetic conductive members 7. Therefore, the pair of magnetic conductive members 7 can improve the magnetic field distribution at the position of the stationary contact 23 to provide a large enough driving force for the arc guided from the stationary contact 23 to the arc starting piece 3, so as to drive the arc on the arc starting piece 3 to move along the surface of the arc starting piece 3 toward the arc extinguishing chamber 6.

[0048] Continue to refer to Figures 3 to 4 , further, the iron core 51 can include a cylindrical iron core. The mounting portion 71 of one magnetic conductive member 7 in the pair of magnetic conductive members 7 is connected to one end face of the iron core 51, and the mounting portion 71 of the other magnetic conductive member 7 in the pair of magnetic conductive members 7 is connected to the other end face of the iron core 51.

[0049] Return to refer to Figure 2 , in some embodiments, the bending portion 21 can include a first portion 211, a second portion 212, and a third portion 213. The first portion 211 can include a mounting surface 2111 for arranging the stationary contact 23. The third portion 213 can be arranged away from the stationary contact 23, and the third portion 213 can be connected to the connecting portion 22. The second portion 212 can be arranged between the first portion 211 and the third portion 213, and the second portion 212 can be bent along the direction away from the moving contact 1.

[0050] Furthermore, since the second part 212 is bent in a direction away from the moving contact 1, when the coil 52 is energized, the direction of the current flowing through the coil 52 can be the same as the direction of the current flowing through the second part 212. Thus, it can be ensured that the magnetic field generated when the current flows through the second part 212 and the magnetic field generated when the current flows through the coil 52 can be superimposed on each other to improve the arc-blowing effect. In addition, since the direction of the current flowing through the coil 52 and the direction of the current flowing through the second part 212 change simultaneously, the circuit breaker 100 realizes non-polar arc extinguishing.

[0051] Continue to refer to Figures 1 to 3 , in some embodiments, the permanent magnet 4 can be located on a side of the electromagnet 5 away from the arc extinguishing chamber 6. The electromagnet 5 can be located between the arc initiating piece 3 and the third part 213.

[0052] Return to refer Figures 1 to 2 , in some embodiments, the insulating member 8 can be disposed on a side of the arc initiating piece 3 facing the bent portion 21 and cover the mounting surface 2111. Further, a part of the insulating member 8 can be located between the mounting surface 2111 and the arc initiating piece 3 to prevent the arc initiating piece 3 from conducting with the static contact 2 when the circuit breaker 100 is in the closed state.

[0053] Figure 5 The structural schematic diagrams of the static contact 2, the arc initiating piece 3, the permanent magnet 4, the electromagnet 5, and the paired magnetic conductive members 7 according to some other embodiments of the present disclosure are shown. Figure 6 Shows Figure 5 The structural schematic diagrams of the static contact 2, the permanent magnet 4, and the electromagnet 5 shown. Figures 5 to 6 The circuit breaker shown and Figures 1 to 4 The circuit breaker shown has a similar structure, and the main differences are mainly in the structure of the iron core 51, the structure of the magnetic conductive member 7, the installation position of the magnetic conductive member 7, the installation position of the permanent magnet 4, and the installation position of the electromagnet 5. The structures of the moving contact 1, the static contact 2, the arc initiating piece 3, the permanent magnet 4, the arc extinguishing chamber 6, and the insulating member 8 are similar to those described in conjunction with Figures 1 to 4 above. In the following, the differences between the two will be mainly described, and for the same parts, they will not be described again.

[0054] Continue to refer to Figures 5 to 6 , in some embodiments, the iron core 51 can include a square iron core. The mounting portions 71 of the paired magnetic conductive members 7 are respectively disposed on a side of the iron core 51 adjacent to the static contact point 23. That is to say, the mounting portions 71 of the paired magnetic conductive members 7 are both disposed on the top side of the square iron core. The extending portions 72 of the paired magnetic conductive members 7 can extend in the direction of the static contact point 23 and be disposed on the opposite side of the static contact point 23.

[0055] Continue to refer toFigures 5 to 6 , in some embodiments, the permanent magnet 4 may be located on a side of the electromagnet 5 away from the arc extinguishing chamber 6, and the permanent magnet 4 is disposed on the iron core 51. The electromagnet 5 may be located between the first portion 211 and the third portion 213. Thus, the structure of the circuit breaker according to the embodiment of the present disclosure is compact, and the arc extinguishing structure can be applied to a circuit breaker with a small volume.

[0056] According to an embodiment of the present disclosure, when the permanent magnet 4 guides the arc foot of the arc to the arcing piece 3, the coil 52 is energized and generates a strong magnetic field to smoothly blow the arc into the arc extinguishing chamber 6. Therefore, for a circuit breaker with a large current rating, the arc extinguishing effect is obvious. In addition, since the two ends of the coil 52 are respectively connected to the bent portion 21 and the arcing piece 3, the voltage of the coil 52 is equal to the voltage between the arcing piece 3 and the static contact 2, so the current flowing through the coil 52 is limited, thereby avoiding the coil 52 from being burned out. In addition, the circuit breaker can also meet the requirement of arranging the coil 52 on both sides.

[0057] The arc extinguishing design according to the embodiment of the present disclosure can be applied to various circuit breakers to at least partially solve the above problems. It should be understood that the arc extinguishing design according to the embodiment of the present disclosure can also be applied to other electrical components, and the embodiments of the present disclosure do not limit this.

[0058] The embodiments of the present disclosure have been described above. The above description is exemplary and not exhaustive, and is not limited to the disclosed embodiments. Many modifications and variations are obvious to those of ordinary skill in the art in the technical field without departing from the scope and spirit of the described embodiments. The selection of the terms used herein is intended to best explain the principles of the embodiments, practical applications, or improvements to the technology in the market, or to enable other ordinary skilled persons in the technical field to understand the embodiments disclosed herein.

Claims

1. A circuit breaker (100), characterized in that, The circuit breaker (100) includes: a moving contact (1); a static contact (2), including a bent portion (21) and a static contact point (23), the bent portion (21) forms an installation space (101), and the static contact point (23) is arranged on the bent portion (21); an arc guide piece (3), spaced apart from the static contact (2) and arranged around at least a part of the outer side surface of the static contact point (23); a permanent magnet (4), at least part of which is located in the installation space (101); an electromagnet (5), at least part of which is located in the installation space (101) and includes an iron core (51) and a coil (52) arranged around the iron core (51), one end of the coil (52) is connected to the bent portion (21), and the other end of the coil (52) is connected to the arc guide piece (3); and an arc extinguishing chamber (6), adjacent to one end of the arc guide piece (3) facing away from the static contact point (23), wherein when the moving contact (1) moves away from the static contact point (23) and an arc is generated between the moving contact and the static contact point (23), the arc is guided by the permanent magnet (4) to the arc guide piece (3), and the coil (52) is energized to generate a magnetic field that guides the arc to be guided to the arc guide piece (3) towards the arc extinguishing chamber (6).

2. The circuit breaker (100) according to claim 1, characterized in that, The arc guide piece (3) includes a clamping portion (31) and a guiding portion (32), the clamping portion (31) is arranged around at least a part of the outer side surface of the static contact point (23) and is spaced apart from the static contact point (23), and the guiding portion (32) is adjacent to the arc extinguishing chamber (6).

3. The circuit breaker (100) according to claim 1, wherein, The circuit breaker (100) further includes a pair of magnetic conductive members (7), each of the pair of magnetic conductive members (7) includes a mounting portion (71) and an extending portion (72), the mounting portions (71) of the pair of magnetic conductive members (7) are respectively connected to the iron core (51), and the extending portions (72) of the pair of magnetic conductive members (7) extend towards the direction of the static contact point (23) and are arranged on the opposite sides of the static contact point (23).

4. The circuit breaker (100) according to claim 3, characterized in that, The bent portion (21) includes a first part (211), a second part (212) and a third part (213), the first part (211) includes a mounting surface (2111) for arranging the static contact point (23), the third part (213) is arranged facing away from the static contact point (23), and the second part (212) is bent and arranged between the first part (211) and the third part (213).

5. The circuit breaker (100) according to claim 4, characterized in that, When the coil (52) is energized, the direction of the current flowing through the coil (52) is the same as the direction of the current flowing through the second part (212).

6. The circuit breaker (100) according to claim 4, characterized in that, The mounting portion (71) of one of the pair of magnetic conductive members (7) is connected to one end face of the iron core (51), and the mounting portion (71) of the other of the pair of magnetic conductive members (7) is connected to the other end face of the iron core (51).

7. The circuit breaker (100) according to claim 6, characterized in that, The permanent magnet (4) is located on a side of the electromagnet (5) facing away from the arc extinguishing chamber (6), and the electromagnet (5) is located between the arcing piece (3) and the third part (213).

8. The circuit breaker (100) according to claim 4, characterized in that, The mounting parts (71) of the pair of magnetic conduction members (7) are respectively arranged on a side of the iron core (51) adjacent to the static contact (23).

9. The circuit breaker (100) according to claim 8, characterized in that, The permanent magnet (4) is located on a side of the electromagnet (5) facing away from the arc extinguishing chamber (6), and the electromagnet (5) is located between the first part (211) and the third part (213).

10. The circuit breaker (100) according to claim 4, characterized in that, The circuit breaker (100) further includes an insulating member (8), and a part of the insulating member (8) is arranged between the mounting surface (2111) and the arcing piece (3).

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