Circuit breaker

Abstract

The invention provides a circuit breaker which at least comprises an insulating shell and internal elements, and the internal elements at least comprise an arc striking piece, a static contact, a moving contact, an operating mechanism, a connecting conductor and at least one U-shaped or U-shaped magnet yoke. The connecting conductor is electrically connected with the moving contact, the U-shaped or U-shaped magnet yoke is arranged on the connecting conductor in a sleeving manner, the opening direction of the U-shaped or U-shaped magnet yoke faces towards a magnetic conduction piece or / and an arc striking piece on the moving contact, and the arc striking piece or / and the magnetic conduction piece is / are subjected to the magnetic field action of the U-shaped or U-shaped magnet yoke. Therefore, the residence time of the arc between the moving contact and the static contact is shortened, the opening speed of the moving contact is accelerated, the current limiting capability is enhanced, and the capability of breaking short-circuit fault current is improved.

Description

Technical Field

[0001] The invention relates to the technical field of low-voltage electrical appliances, and in particular to a circuit breaker. Background Art

[0002] The small circuit breakers currently on the market are generally composed of an operating mechanism, an electromagnetic instantaneous protection system, a thermal overload protection system, a moving contact, a static contact, and an arc extinguishing chamber. As for the circuit breakers currently on the market, when the circuit breaker interrupts the fault current, an arc will be generated between the moving contact and the static contact. The arc is introduced into the arc extinguishing chamber by the arc-starting piece for arc extinguishing. In the process of the arc entering the arc extinguishing chamber from between the moving contact and the static contact, the arc will cause serious burning damage to the moving contact, static contact, arc-starting piece, and arc extinguishing chamber. As the number of interruptions increases or the interrupting current is too high, the moving contact, static contact, arc-starting piece, and arc extinguishing chamber will be permanently damaged.

[0003] In the prior art, for example, the magnetic conductive part in patent CN215527514U is sleeved on the arc-starting plate, and a permanent magnet is also arranged on the magnetic conductive part, and the permanent magnet is used to blow the arc. Since the magnetic conductive part of the prior art is sleeved on the arc-starting plate, before the arc jumps from the moving contact to the arc-starting plate and the current loop is not formed on the arc-starting plate, the magnetic conductive plate cannot generate a magnetic field to blow the arc. In the utility model patent CN215527514U, the technicians added a permanent magnet to the magnetic conductive part, just to make the magnetic conductive plate always have a magnetic field. This treatment method is not ideal. The effect cannot be achieved when the material is added. The permanent magnet is restricted by the spatial structure and cannot achieve a large magnetic flux. Therefore, the effect of improving the breaking capacity is not great. In addition, the permanent magnet has N / S polarity, and the polarity always exists. In the DC scene, there are regulations for the positive / negative connection of the input and output terminals of the circuit breaker, otherwise the arc will be back-sprayed, and the safety hazard is great.

[0004] As people put forward higher requirements on the performance of miniature circuit breakers, how to improve the product breaking capacity within the existing structural space of miniature circuit breakers is a technical problem that needs to be solved urgently by miniature circuit breaker researchers. Summary of the invention

[0005] Based on the above background, the present invention provides a circuit breaker, which can effectively overcome at least one of the above problems by arranging a yoke on the connecting conductor. When current flows through the connecting conductor, the yoke is magnetized to form a magnetic field, magnetizing the arc-striking piece and / or the magnetic conductive part on the moving contact, so that the arc-striking piece and / or the magnetic conductive part have a magnetic attraction effect on the arc, and accelerate the disconnection speed of the moving contact.

[0006] The technical solution of the present invention is as follows:

[0007] A circuit breaker, characterized in that it at least includes an insulating housing and internal components, and the internal components at least include an arc guide piece, a static contact, a moving contact, an operating mechanism, a connecting conductor, and at least one U-shaped or C-shaped magnetic yoke. The connecting conductor is electrically connected to the moving contact. The U-shaped or C-shaped magnetic yoke is sleeved on the connecting conductor, and the opening direction of the U-shaped or C-shaped magnetic yoke faces the magnetic conductive part on the moving contact and / or the arc guide piece.

[0008] In this way, by sleeving the U-shaped or C-shaped magnetic yoke on the connecting conductor, once the circuit breaker is powered on, the U-shaped or C-shaped magnetic yoke will be magnetized. The magnetized magnetic yoke acts on the components required for arc guiding with the magnetic field, improving the arc guiding speed. When the circuit breaker undergoes a short circuit, the current on the connecting conductor increases exponentially, and the induced magnetic field received by the magnetic yoke also increases exponentially. The N / S magnetic poles on the opening of the magnetic yoke face the arc guiding components, magnetizing the arc guiding components to have a magnetic field, accelerating the arc transfer and improving the breaking capacity. The opening of the magnetic yoke faces the magnetic conductive part on the moving contact. After the magnetic yoke magnetizes the magnetic conductive part, it attracts the arc to jump from the moving contact. At the same time, under the suction force of the magnetic yoke, the opening speed of the moving contact also increases significantly, which plays an important role in improving the breaking capacity.

[0009] In a preferred embodiment, the connecting conductor is also connected to the arc guide piece.

[0010] In this way, while the connecting conductor is connected to the moving contact, the other end is also connected to the arc guide piece and the wiring terminal. After the arc jumps during breaking, a new conductive loop is formed between the arc guide piece and the wiring terminal and gradually enters the arc extinguishing chamber.

[0011] In a preferred embodiment, the connecting conductor is a rigid conductor or a flexible conductor.

[0012] In a preferred embodiment, when the connecting conductor is a rigid conductor, its conductor material is a copper conductor or an alloy conductor.

[0013] By setting the form of the connecting conductor in this way, various methods can be implemented inside the circuit breaker. For example, when overload protection needs to be implemented, the connecting conductor can be a bimetallic part made of alloy conductor material that can automatically bend when overheated to achieve overload protection. Directly setting it as a flexible conductor can be directly welded to the moving contact without affecting the moving function. Using a thicker flexible conductor in high-current specifications will affect the movement. Implementing it as a perturbed rigid conductor can achieve large-rated-current application scenarios.

[0014] In a preferred embodiment, wiring terminals are provided at both ends of the circuit breaker, and the wiring terminals are directly or indirectly connected to the connecting conductor.

[0015] In a preferred embodiment, the arc guide piece is made of a magnetic conductive metal material.

[0016] In this way, the arcing piece is made of a magnetically conductive metal material. Only by having magnetic conductivity can it receive the magnetic field generated by the magnetic yoke and apply the magnetic force to the electric arc.

[0017] In a preferred embodiment, the shape of the magnetic conductive member on the moving contact is U-shaped, C-shaped, sheet-shaped, or at least one bent shape or curved surface shape and combinations thereof.

[0018] In this way, by arranging a magnetic conductive member on the moving contact to interact with the magnetic yoke sleeved on the connecting conductor, the opening of the moving contact can be accelerated. The magnetic flux of the magnetic yoke is superimposed on the magnetic conductive member, greatly increasing the attracting and jumping speed of the magnetic conductive member to the electric arc, improving the breaking capacity of the circuit breaker, and reducing the ablation of the moving contact.

[0019] In a preferred embodiment, the opening of the magnetic yoke is close to or adjacent to the arcing member.

[0020] In the above embodiment, the relative position of the arcing piece and the magnetic yoke is set according to the actual layout and shape structure of the arcing piece of the circuit breaker. The opening position of the U-shaped or C-shaped magnetic yoke is the magnetic pole, and the magnetic induction lines at the magnetic pole point from the N pole to the S pole and disperse from the pole surface. Setting the opening of the U-shaped or C-shaped magnetic yoke close to or adjacent to the arcing piece can gather the magnetic induction lines to form a magnetic circuit, enabling the arcing piece to generate a magnetic field and having an enhanced attracting effect on the electric arc.

[0021] In a preferred embodiment, when the opening of the magnetic yoke faces the magnetic conductive member on the moving contact, it is in a separated state when the moving contact and the static contact are closed, and is in a close or closed state when the moving contact and the static contact are opened.

[0022] In this way, the magnetic conductive member arranged on the moving contact is fixed integrally with the moving contact and moves together with the moving contact. When the moving contact is closed, it is in a separated state. During the opening process, it gradually approaches the magnetic yoke until it is closed. The magnetic conductive member can also generate an induced magnetic field by the current on the moving contact. Corresponding to the opening of the magnetic yoke, the current direction on the moving contact is opposite to the current direction on the connecting conductor, and the magnetic field polarities of the magnetic conductive member and the magnetic yoke are also opposite. The magnetic yoke can generate a large attraction force on the magnetic conductive member on the moving contact, having the function of accelerating the opening of the moving contact, which can greatly improve the breaking capacity of the circuit breaker. At the same time, the magnetic field can also act on the magnetic conductive member to enable the magnetic conductive member to attract the electric arc to jump.

[0023] In a preferred embodiment, the end shape of the opening position of the magnetic yoke is one of a straight edge, an inclined edge, an arc, and a special shape.

[0024] In the above embodiment, the position where the opening of the magnetic yoke is arranged extends and the shape of the opening are laid out according to the shape structure of each component of the circuit breaker. The inner wall of the U-shaped magnetic yoke and the end face of the opening position are places where the magnetic force lines are dense. Through the flexible layout of the end shape, the magnetic field received by the arcing piece is maximized, enhancing the attraction of the arcing piece to the electric arc.

[0025] In a preferred embodiment, the arc-starting piece and the connecting conductor surround the root of the U-shaped magnetic yoke for at least half a circle.

[0026] In the above embodiment, the length or number of turns of the root of the yoke around the connecting conductor directly affects the strength of the induced magnetic field received by the yoke. The longer the length of the connecting conductor and the arc-striking plate and the more turns there are, the stronger the magnetic field generated by the yoke, the larger the magnetic field acting on the arc-striking plate, and the better the arc-striking effect.

[0027] In a preferred embodiment, an insulating plate is partially provided on the arc-starting piece, and the insulating plate is not conductive to the arc generated when the moving contact and the static contact are opened.

[0028] In the above embodiment, after the arc-striking plate is provided with local insulation, the arc cannot jump to the arc-striking plate immediately. When the arc is elongated to a certain extent, it jumps to the arc-striking plate and then moves to the arc extinguishing chamber. The local insulation delays the arc jump, so that the conductor acts on the induced magnetic field of the yoke for a longer time, and the magnetic field acts on the arc for a longer time.

[0029] In a preferred embodiment, the arc-starting piece may also be a split forked structure.

[0030] In the above embodiment, the bifurcated design of the arc striking piece can accelerate the attraction and arc jumping of the arc, prolong the time of the induced magnetic field to which the magnetic yoke is subjected, and produce a better arc striking effect.

[0031] In a preferred embodiment, the opening position of the yoke corresponds to the bifurcation of the arc-starting piece.

[0032] In the above embodiment, after the arc-starting piece is magnetized by the magnetic yoke, it has an attractive effect on the arc, further accelerating the arc to enter the arc extinguishing chamber.

[0033] The beneficial effects of the present invention are as follows:

[0034] 1. The present invention arranges a magnetic yoke on the connecting conductor, and the magnetic yoke and the arc-striking piece and / or the magnetic conductive part form a magnetic field opposite to each other. When current flows through the connecting conductor, the magnetic yoke is magnetized to form a magnetic field, which magnetizes the arc-striking piece and / or the magnetic conductive part, so that the arc-striking piece and / or the magnetic conductive part have a strong magnetic field, which plays a role in quickly attracting the arc and improving the breaking capacity in a limited space.

[0035] 2. By arranging a magnetic conductive part on the moving contact, it can not only generate an induced magnetic field with the current on the moving contact, but also form a magnetic circuit with the magnetic yoke on the connecting conductor to realize magnetic flux superposition after the moving contact and the static contact are opened, which has the effect of accelerating the opening of the moving contact and quickly attracting and jumping the arc, greatly improving the breaking capacity of the circuit breaker.

[0036] 3. By providing an arc-striking plate and rationally arranging the positions of the arc-striking plate and the magnetic yoke, the arc-striking plate has an attractive effect on the arc after being magnetized by the magnetic yoke, which can further accelerate the arc to enter the arc extinguishing chamber.

[0037] 4. By setting the arc starting piece as a forked structure, the arc attraction jump can be accelerated. BRIEF DESCRIPTION OF THE DRAWINGS

[0038] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0039] Figure 1 It is a schematic diagram of the internal structure of a circuit breaker according to a first specific embodiment of the present invention;

[0040] Figure 2 for Figure 1 Schematic diagram of the magnetic field generated by the current flowing through the moving contact and the stationary contact on the yoke and the magnetic conductive part during the opening process of the moving contact of the circuit breaker;

[0041] Figure 3 for Figure 1 Schematic diagram of the magnetic field generated by the current flowing through the moving contact and the stationary contact on the yoke and the magnetic conductive part when the moving contact of the circuit breaker is fully opened;

[0042] Figures 4 to 9 It is a schematic diagram of the connection between the magnetic conductive member and the moving contact and the cooperation with the magnetic yoke in other embodiments.

[0043] Fig.10 for Figure 1 Schematic diagram of partial structural decomposition in ;

[0044] Fig.11 for Figure 1 A schematic diagram of the structure of the middle insulating member;

[0045] Fig.12 for Figure 1 Schematic diagram of current flow and arc movement of the circuit breaker before the arc jumps;

[0046] Fig.13 for Figure 1 Schematic diagram of current flow and arc movement of the circuit breaker after the arc jumps;

[0047] Fig.14 for Figure 1 Schematic diagram of another part of the structure;

[0048] Fig.15It is a partial structural schematic diagram of a circuit breaker according to a second specific embodiment of the present invention;

[0049] Fig.16 It is another partial structural schematic diagram of the circuit breaker according to the second specific embodiment of the present invention;

[0050] Fig.17 for Fig.15 Schematic diagram of the current direction and arc trend;

[0051] Fig.18 for Fig.17 Schematic diagram of the principle of forming a magnetic field at the opening of the middle magnetic yoke;

[0052] Fig.19 It is a partial structural schematic diagram of a circuit breaker according to a third specific embodiment of the present invention;

[0053] Fig. 20 It is a partial structural schematic diagram of a circuit breaker according to a fourth specific embodiment of the present invention;

[0054] Fig.21 for Fig. 20 Schematic diagram of the structure of the middle arc-starting piece;

[0055] Fig. 22 for Fig. 20 Schematic diagram of current flow and arc movement of the circuit breaker before the arc jumps;

[0056] Fig.23 for Fig. 20 Schematic diagram of current flow and arc movement of the circuit breaker after the arc jumps;

[0057] Fig.24 It is a partial structural schematic diagram of a circuit breaker according to a fifth specific embodiment of the present invention;

[0058] Fig.25 It is a partial structural schematic diagram of a circuit breaker according to a sixth specific embodiment of the present invention;

[0059] Fig.26 It is a partial structural schematic diagram of a circuit breaker according to a seventh specific embodiment of the present invention;

[0060] Fig. 27 and Fig.28 It is a partial structural schematic diagram of a circuit breaker according to a specific embodiment 8 of the present invention;

[0061] Fig.29 It is a partial structural schematic diagram of a circuit breaker according to a ninth specific embodiment of the present invention. DETAILED DESCRIPTION

[0062] To make the objectives, technical solutions, and advantages of the present invention more clear, the following will describe in more detail the technical solutions in the embodiments of the present invention with reference to the accompanying drawings in the embodiments of the present invention. In the drawings, the same or similar reference numerals from beginning to end represent the same or similar elements or elements with the same or similar functions. The described embodiments are part of the embodiments of the present invention, rather than all of the embodiments.

[0063] The embodiments described below by referring to the accompanying drawings are exemplary and are intended to explain the present invention, and should not be construed as limiting the present invention. All other embodiments obtained by those of ordinary skill in the art based on the embodiments of the present invention without creative efforts shall fall within the scope of protection of the present invention.

[0064] The following will describe in detail the embodiments of the present invention with reference to the accompanying drawings.

[0065] Embodiment 1

[0066] As Figure 1 shown, a specific embodiment of the present invention provides a circuit breaker 1000, which at least includes an insulating housing 10 and internal components disposed within the insulating housing 10. The internal components at least include an arc guide piece 110, a static contact 30, a moving contact 40, terminal blocks 50 disposed at both ends of the circuit breaker, an operating mechanism 20, a connecting conductor 90, and at least one U-shaped or C-shaped magnetic yoke 100. The connecting conductor is connected between the terminal block and the moving contact. The U-shaped or C-shaped magnetic yoke 100 is sleeved on the connecting conductor 90, and the opening direction of the U-shaped or C-shaped magnetic yoke faces the magnetic conductive member on the moving contact and / or the arc guide piece. A magnetic conductive member 402 is disposed on the moving contact 40, and the magnetic conductive member 402 is disposed corresponding to the opening of the U-shaped or C-shaped magnetic yoke 100. An arc guide piece 110 is disposed in front of the opening of the U-shaped or C-shaped magnetic yoke 100. The arc guide piece 110 is made of a magnetic conductive metal material and is connected to the connecting conductor at the same time. When a current flows through the connecting conductor 90, the magnetic yoke 100 is magnetized to form a magnetic field, which magnetizes the arc guide piece 110 and / or the magnetic conductive member 402, so that the arc guide piece 110 and / or the magnetic conductive member 402 have a strong magnetic field, playing a role in quickly attracting the arc, improving the breaking capacity in a limited space. By reasonably arranging the relative positions of the arc guide piece 110 and the magnetic yoke 100, the arc guide piece 110 has an attracting effect on the arc after being magnetized by the magnetic yoke 100, and can further accelerate the arc into the arc extinguishing chamber.

[0067] In this embodiment, a magnetic conductive member 402 is fixed behind the alloy contact of the moving contact 40. The magnetic conductive member 402 is a magnetic conductive member in the shape of a U shape, a C shape, a sheet shape, at least one bent shape, a curved surface shape or a combination thereof, and is arranged on the back of the alloy contact of the moving contact 40. When the magnetic conductive member 402 is in the shape of a sheet, its shape can be a T shape, a straight shape or an L shape. The magnetic conductive member 402 corresponds to the magnetic poles at both ends of the opening of the magnetic yoke 100. When the magnetic conductive member 402 is in a U shape or a C shape, it is fixed to the back of the alloy contact of the moving contact 40, and the magnetic poles at both ends of its opening correspond to the magnetic poles at both ends of the opening of the magnetic yoke 100.

[0068] In this embodiment, the opening of the magnetic yoke faces the magnetic conductive member on the moving contact, and is in a separated state when the moving contact and the static contact are closed, and is in an adjacent or closed state when the moving contact and the static contact are opened. The magnetic conductive member provided on the moving contact is fixed integrally with the moving contact and moves together with the moving contact. When the moving contact is closed, it is in a separated state, and during the opening process, it gradually approaches the magnetic yoke until it is closed. The magnetic conductive member can also be induced by the current on the moving contact to generate an induced magnetic field. Corresponding to the opening of the magnetic yoke, the current direction on the moving contact is opposite to the current direction on the connecting conductor. The magnetic field polarities of the magnetic conductive member and the magnetic yoke will also be opposite. The magnetic yoke can generate a large attractive force on the magnetic conductive member on the moving contact, having the function of accelerating the opening of the moving contact, which can greatly improve the breaking capacity of the circuit breaker. At the same time, the magnetic field can also act on the magnetic conductive member to make the magnetic conductive member attract the arc to jump.

[0069] Please refer to Figure 2 , during the opening process of the moving contact 40 and the static contact 30, the current flows from the moving contact 40 to one side of the terminal 50, and there is current passing through the connecting conductor 90. The magnetic yoke 100 is magnetized by the induced magnetic field to generate magnetism, and the magnetic conductive member 402 is also magnetized by the current flowing through the moving contact 40. Since the current direction on the moving contact 40 is opposite to the current direction on the connecting conductor 90, the induced magnetic field polarities of the magnetic conductive member 402 and the magnetic yoke 100 are opposite. When the circuit breaker starts to break, the moving contact 40 moves towards the opening position, making the magnetic conductive member 402 gradually approach the magnetic yoke 100. Since the induced magnetic field polarities of the magnetic conductive member 402 and the magnetic yoke 100 are opposite, a suction force will be generated, making the opening speed of the moving contact 40 faster and greatly improving the breaking capacity of the circuit breaker.

[0070] Please continue to refer to Figure 3 , when the moving contact 40 is completely opened, the magnetic conductive member 402 and the magnetic yoke 100 form a magnetic circuit. The opposite induced magnetic field polarities of the two make the magnetic flux on the magnetic conductive member 402 superimposed and strengthened, thereby acting on the arc with the magnetic field, attracting the arc to quickly separate from the moving contact 40 and jump to the arc attracting piece 110, reducing the ablation of the moving contact 40 by the arc.

[0071] The end shape of the opening position of the yoke 100 can be any one of a straight edge, an inclined edge, an arc, and a special shape. Specifically, the opening end shape of the yoke 100 can be designed according to the structures of the arc starting piece 110 and the magnetic conduction member 402. When the arc starting piece 110 or the magnetic conduction member 402 is an inclined edge, the opening end of the yoke 100 is set as an inclined edge; when the arc starting piece 110 or the magnetic conduction member 402 is a straight edge, the opening end of the yoke 100 is set as a straight edge. At the same time, the opening end of the yoke 100 can be arranged adjacent to or beyond the arc starting piece 110 or the magnetic conduction member 402. The inner wall of the yoke 100 and the end face at the opening position are places where magnetic lines of force are concentrated. Through the flexible layout of the end shape of the yoke 100, the magnetic field received by the arc starting piece 110 or the magnetic conduction member 402 can be maximized, enhancing the attraction of the arc starting piece 110 or the magnetic conduction member 402 to the arc and accelerating the opening speed of the moving contact 40.

[0072] Please continue to refer to Figures 1 to 4 , in this embodiment, the moving contact group 40 is composed of two moving contacts 40 stacked. The internal resistance of the moving contact structure formed by stacking multiple moving contacts 40 is small, and the temperature rise is low, which is suitable for applications with high rated current.

[0073] In this embodiment, one magnetic conduction member 402 is fixed on one of the two moving contacts 40, which does not affect the independent movement between the two moving contacts 40. During the closing operation, the two moving contacts 40 both have independent contact pressures on the static contact. Any one of welding, riveting, and clamping can be adopted as the connection method between the magnetic conduction member 402 and the moving contact 40, and the most convenient connection method can be selected for fixed connection according to the actual situation and specific structural features.

[0074] In other specific embodiments, as Figure 4 described, the difference from the above embodiment is that the magnetic conduction member 402 is in a flat plate shape, and the flat plate-shaped magnetic conduction member 402 is arranged on the opposite side of the alloy contact. The magnetic conduction member 402 is arranged on one of the two moving contact pieces, which does not affect the independent movement between the two moving contact pieces.

[0075] Figure 5 and Figure 6 as shown, when the magnetic conduction member is in a U shape or a C shape, it is fixed on the back of the alloy contact of the moving contact 40. The opening end of the magnetic conduction member 402 faces the opening end of the yoke 100, and the opening end of the magnetic conduction member 402 and the alloy contact are respectively located at the front and rear ends of the moving contact 40.

[0076] Figure 7A schematic structural diagram of a magnetic conductive part and a moving contact in another embodiment is shown, which differs from the above embodiment in that the moving contact 40 is a single moving contact piece, the magnetic conductive part 402 is T-shaped and is arranged on the lower side of the moving contact 40, and the length direction of the magnetic conductive part 402 is arranged along the width direction of the U-shaped groove of the yoke 100.

[0077] Figure 8 The magnetic conductive member shown in the figure is in a straight line shape, and the length direction of the magnetic conductive member 402 is arranged along the length direction of the moving contact 40. The magnetic conductive member 402 and the alloy contact are respectively arranged on both sides of the moving contact 40. When the moving contact 40 is fully opened, the magnetic conductive member 402 is located in the opening of the yoke 100.

[0078] Fig. 9 The magnetic conductive member shown is L-shaped, the moving contact 40 is a single moving contact piece, and the magnetic conductive member 402 is fixed to the end of the moving contact 40 .

[0079] Please refer to Figure 1 and Figure 2 In this embodiment, the connecting conductor 90 is a soft connecting conductor, which is a conductor composed of a plurality of copper wires or thin copper sheets and has a certain flexibility.

[0080] Please continue to refer to Figure 1 One end of the arc-striking piece 110 is connected to the connecting conductor 90, and the other end extends to the arc-extinguishing chamber 80 and maintains a gap with the arc-extinguishing chamber 80. Both ends of the opening of the yoke 100 extend to cover part of the arc-striking piece 110, that is, part of the arc-striking piece 110 is located in the opening of the yoke on the connecting conductor 90. When a short-circuit current occurs, the short-circuit current flows through the connecting conductor 90, and the yoke 100 is magnetized by the induced magnetic field. The magnetized yoke 100 applies a magnetic field On the arc-striking plate 110, the arc-striking plate 110 and the yoke 100 have an attraction and guiding effect on the arc after being magnetized, so that the arc quickly enters the arc extinguishing chamber 80, thereby accelerating the arc extinguishing. When the arc enters the arc extinguishing chamber 80, the gap between the arc-striking plate 110 and the arc extinguishing chamber 80 is bridged by the arc to form a new arc circuit, and the multiple metal grids of the arc extinguishing chamber 80 cut the arc into multiple sections of series arcs, thereby increasing the arc voltage drop, so that the system voltage cannot maintain the continuous burning of the arc and it is extinguished.

[0081] Please refer to Figure 1 , Fig.10 and Fig.11The insulating member 120 includes baffles arranged on both sides of the arc extinguishing chamber 80, and the baffles on both sides extend from the arc extinguishing chamber 80 to the vicinity of the moving contact and the static contact and the opening of the yoke 100. The baffles on both sides form a channel for the arc to pass through. The insulating member 120 insulates and isolates the yoke 100 from the moving contact 40, so that the arc generated when the yoke 100 and the moving contact 40 and the static contact 30 are opened is not conductive. The material of the insulating member 120 is made of an insulating gas-generating material that has a gas-generating effect when encountering high temperature. The arc burns the insulating material to cause the insulating material to produce a mixed gas containing hydrogen. The gas can play a role of blowing and eliminating the arc, further improving the breaking capacity of the circuit breaker. Of course, the insulation measure of the first yoke is not only to set an insulating member, but also to insulate the first yoke as a whole. The insulation treatment is at least one of the processes of spraying insulating material, enamel, dipping, and coating.

[0082] Furthermore, the insulating member 120 also includes an insulating plate 121 extending above one end of the arc-striking piece 110, and the insulating member 121 is located between the baffles on both sides. The insulating plate 121 is arranged on the upper surface of one end of the arc-striking piece 110 connected to the connecting conductor 90, so that the arc-striking piece 110 is partially insulated. In this way, the arc generated when the moving contact and the static contact are opened cannot immediately jump to the arc-striking piece 110, so that the current around the yoke 100 is maintained in one direction for a longer time, and the maximum induced magnetic field of the yoke 100 is exerted. Fig.12 As shown; due to the partial insulation setting of the arc-starting piece 110, the current still flows through the connecting conductor 90, and the magnetic yoke 100 can continue to generate a relatively large induction magnetic field to act on the arc-starting piece 110 to continuously attract and lengthen the arc and accelerate the arc movement, so that the magnetic yoke can be fully utilized for the arc-starting operation, such as Fig.13 shown.

[0083] The length setting of the insulating plate 121 covering the arc-striking plate 110 is relatively critical. If it is set too long, the connecting conductor 90 will be subjected to the short-circuit current for too long, which will cause the connecting conductor 90 to overheat and cause irreversible damage. If the length setting of the insulating plate 121 covering the arc-striking plate 110 is too short, after the arc quickly jumps to the arc-striking plate 110, the current will return at the bending position of the arc-striking plate 110, and currents in both positive and negative directions will flow through the bending position at the same time, which will cause most of the induced magnetic fields acting on the first magnetic yoke to be offset. After the arc jumps, the magnetic yoke 1 00 will quickly lose its magnetizing effect on the arc-striking plate 110 if it cannot obtain a sufficient induced magnetic field, and will not play a good role in lengthening and accelerating the arc movement. In this embodiment, the covering length of the insulating plate 121 on the arc-striking plate 110 is beyond the bending overlapping section of the arc-striking plate 110 covered by the yoke 100, and the bending position is the overlapping part of the current in the positive and negative directions. When the arc jumps over the insulating plate 121 to the arc-striking plate 110, it is closer to the arc extinguishing chamber 80. The return current at the yoke 100 will offset part of the induced magnetic field and the effect of the arc striking will almost disappear.

[0084] In the embodiment where a thermal element is provided, the length of the insulating plate 121 covering the arc-striking plate 110 is also critical. If it is set too long, the thermal element will be subjected to the short-circuit current for too long, causing the thermal element to overheat and cause irreversible damage. Therefore, it is very important to reasonably set the insulating plate 121 to cover the arc-striking plate 110.

[0085] Furthermore, since an insulating part 120 is provided on the inner wall of the yoke 100, the opening of the yoke 100 is insulated and sleeved on the arc-striking piece 110, so that the yoke 100 is insulated from the moving contact 40, the arc-striking piece 110, and the connecting conductor 90. Such a configuration prevents a short circuit between the yoke 100 and the arc-striking piece 110.

[0086] like Fig.14 As shown, the insulating member 120 supports the fixed yoke 100 and also extends to the static contact 30 and the arc-striking piece 110 to reach the edge of the arc-extinguishing chamber 80, forming a passage leading to the arc-extinguishing chamber 80 with the static contact 30 and the arc-striking piece 110. This passage provides a passage for the arc to enter the arc-extinguishing chamber 80 when the circuit breaker 1000 is disconnected due to a short circuit fault. The insulating member 120 is made of an insulating material that has a gas-generating effect when encountering high temperatures. In this embodiment, nylon, polyformaldehyde, or melamine is preferred. Such materials can produce a large amount of mixed gas containing hydrogen when encountering high-temperature burning of the arc during disconnection, which can blow and deionize the arc, further improving the breaking capacity while preventing the free gas in the arc path from short-circuiting the yoke 100 and the static contact 30, the moving contact 40, and the arc-striking piece 110.

[0087] It should be noted that the yoke 100 can be formed as a single part by integral bending, and the end of the U-shaped opening can be an inclined surface or a plane. In other embodiments, the yoke can also be formed by combining two L-shaped and I-shaped part structures to form a U-shaped structure, or by combining L-shaped and L-shaped parts to form a U-shaped structure. The structure of the yoke should take assembly into consideration, and be set to an integral or split structure that is easy to assemble while ensuring that the induced magnetic field is not destroyed in the yoke. When the yoke 100 is set to be split, the U-shaped or U-shaped structure formed by splicing two parts is also easy to assemble while ensuring electromagnetic performance.

[0088] Embodiment 2

[0089] like Fig.15 and Fig.16 As shown, the present invention also provides another specific embodiment of a circuit breaker, which is different from the above embodiment in that, in this embodiment, a thermal element 60 and a connecting conductor 90 are arranged between the moving contact 40 and the connecting terminal 50, and a magnetic yoke is arranged on the thermal element 60. The magnetic yoke sleeved on the thermal element 60 is defined here as a third magnetic yoke 103.

[0090] Please refer to Fig.17 and Fig.18 As shown, in this embodiment, a thermal element 60 and a connecting conductor 90 are connected between the moving contact 40 and the connecting terminal 50, and a third magnetic yoke 103 is arranged on the thermal element 60. When the circuit breaker is short-circuited and disconnected, the current flowing through the connecting conductor 90 and the thermal element 60 is very large, and the induced magnetic field to the third magnetic yoke 103 is also very large. The opening position of the third magnetic yoke 103 will form an N / S magnetic pole, and the magnetic pole has a magnetizing effect on the arc-striking piece 110. After the arc-striking piece 110 is magnetized, it has the effect of enhancing the attraction of the arc and accelerating the driving arc movement, and has the effect of quickly extinguishing the arc, thereby realizing the improvement of the short-circuit breaking capacity of the circuit breaker in a limited space. The arrangement of the third magnetic yoke 103 can adjust the width and quantity according to the spatial position, so as to obtain a larger magnetic field and produce a better arc-striking effect.

[0091] Embodiment 3

[0092] As shown in 19, the present invention provides a circuit breaker structure of a third specific embodiment, which is different from the second embodiment in that two third magnetic yokes 103 are sleeved on the thermal element 60, and multiple magnetic yokes are arranged on the thermal element to achieve a better arc blowing effect.

[0093] Embodiment 4

[0094] like Fig. 20 and Fig.21As shown, the present invention also provides a circuit breaker of a fourth specific embodiment, which is different from the above embodiments in that one end of the arc-striking piece 110 has a forked structure, and the other end extends in a circular arc shape to one side of the arc extinguishing chamber 80, and the forked structure is arranged at the end where the arc-striking piece 110 is connected to the connecting conductor 90, and the forked structure has a first arc-striking branch piece 111 and a second arc-striking branch piece 112 extending in different directions, and the second arc-striking branch piece 112 is connected to the connecting terminal 50, and the first arc-striking branch piece 111 and the second arc-striking branch piece 112 can be split or integrally formed by bending and superimposing.

[0095] The first arc-striking branch piece 111 is arranged at the opening position of the magnetic yoke 100, and the second arc-striking branch piece 112 is arranged on one side of the magnetic yoke 100. The opening position of the magnetic yoke 100 corresponds to the first arc-striking branch piece 111 to form a closed magnetic circuit. The opening position of the first magnetic yoke is the magnetic pole of the magnetic yoke 100 after being magnetized by the induced magnetic field, and the opening position corresponds to the first arc-striking branch piece 111. The magnetic pole of the magnetic yoke 100 can magnetize the first arc-striking branch piece 111 and generate a magnetic field. After the first arc-striking branch piece 111 partially generates a magnetic field, it has an attraction and guiding effect on the arc, prompting the arc to enter the arc extinguishing chamber 80 along a specified path for arc extinguishing operation, thereby achieving the effect of rapid arc striking and arc extinguishing.

[0096] Please combine again Fig. 22 and 23 After the bifurcated structure jumps the arc, the current no longer flows through the connecting conductor 90, and the current flows through the arc-striking piece 110. The current will be connected by the static contact 30 and the first arc-striking branch piece 111 of the arc-striking piece 110. The current is connected to the arc-striking piece 110 through the first arc-striking branch piece 111 until it reaches the terminal 50. Compared with the one-piece bending structure of the arc-striking piece in the first embodiment, there will be no return current, which will cause the induced magnetic field to be mostly offset. The one-piece arc-striking piece 110 in the specific embodiment 1 is provided with an insulating plate 121 between the open position of the moving contact 40 and the head of the arc-striking piece 110, in order to prevent the occurrence of return current and offset a large amount of induced magnetic field, which plays a better role. The U-shaped yoke 100 has a good effect of magnetizing the arc-starting piece 110. In this embodiment, the forked structure of the split arc-starting piece 110 has the same effect, so that the arc can be quickly transferred to the arc extinguishing chamber 80. It should also be noted that the effect of simultaneously implementing the thermal element 60 in the embodiment with an insulating plate 121 is not as good as the arc-starting piece with a forked structure in this embodiment. The main disadvantage is that the time for the arc to jump after being blocked by the insulating plate is longer than the time for the short-circuit current to be passed to the thermal element 60 in this embodiment. If the time is not well controlled, irreversible damage will be caused to the thermal element 60. This problem is also explained in the above-mentioned implementation of the insulating plate 121 length selection scheme.

[0097] Embodiment 5

[0098] Please refer to Fig.24 In this embodiment, the connecting conductor 90 between the moving contact and the terminal 50 is a hard-connected conductor. The connecting conductor 90 is made of copper and / or alloy material. The alloy material is preferably laminated by at least two metal materials with different expansion coefficients. It will bend in a specified direction when heated and can provide overload protection function. The hard-connected conductor is a long strip structure. At least one end of the part that matches it is fixedly connected or movably connected to it. In this embodiment, one end of the moving contact that matches it is movably connected to the hard-connected conductor. The hard-connected conductor 90 is pressure-contacted with the moving contact 40 so that the moving contact 40 can rotate around the rotation axis. The hard-connected conductor includes a copper plate and an elastic member for providing contact pressure between the copper plate and the moving contact. The moving contact is rotationally connected to the copper plate, and the pressure contact relies on the elastic element on one side to squeeze the moving contact 40 and the connecting conductor 90 so that they can reliably contact and conduct electricity.

[0099] Embodiment 6

[0100] Please refer to Fig.25 The difference between this embodiment and the above embodiment is that the connecting conductor 90 is wound around the U-shaped bottom of the magnetic yoke 100 for at least half a circle. The length or number of turns of the root of the magnetic yoke 100 around the conductor 90 directly affects the strength of the induced magnetic field received by the magnetic yoke 100. The longer the length of the connecting conductor 90, the thermal element 60, and the arc-starting sheet 110, and the more turns, the stronger the induced magnetic field received by the magnetic yoke 100, and the better the arc blowing effect.

[0101] It should be noted that in this embodiment, the connection conductor 90 is only used as an example to describe the U-shaped bottom of the yoke 100, but it is not limited to this. The thermal element 60 can be wound around the U-shaped bottom of the third yoke 103 for at least half a circle to achieve the same effect.

[0102] Embodiment 7

[0103] Please refer to Fig.26 In this embodiment, the arc-starting piece 110 is wound around the U-shaped bottom of the yoke 100 for at least half a circle, and the opening of the yoke 100 can be extended to the static contact, and the opening of the yoke 100 can be extended to the static contact and the edge of the arc extinguishing chamber. Specifically, a reasonable layout can be made according to the shape and structure of each component of the circuit breaker to achieve a better arc blowing effect.

[0104] Embodiment 8

[0105] Please refer to Fig. 27 and Fig.28The difference between this embodiment and the above embodiment is that no yoke is arranged on the arc-striking piece 110, and the arc-striking piece 110 is arranged close to or adjacent to the yoke 100. After the yoke 100 is magnetized, since the arc-striking piece 110 is arranged close to or adjacent to the first yoke, when current flows through the connecting conductor 90, the yoke 100 will be magnetized by the induced magnetic field, and the arc-striking piece 110 will also be magnetized by the magnetic field of the yoke 100. At the same time, the magnetic pole position of the yoke 100 will also produce a magnetic blowing effect on the arc, which can also achieve rapid arc striking and enhance the magnetic blowing effect, thereby improving the breaking capacity of the circuit breaker.

[0106] Embodiment 9

[0107] Please refer to Fig.29 The difference between this embodiment and the first embodiment is that the circuit breaker is not provided with an arc extinguishing chamber, but the arc extinguishing function is achieved by providing insulating columns 101 staggered up and down in the insulating housing 10. The insulating columns 101 are staggered on the upper and lower walls of the insulating housing 10. The insulating columns can block and stretch the arc, increase the arc voltage drop, and accelerate the arc extinction. At the same time, the number of internal components of the circuit breaker is reduced, saving costs.

[0108] The present invention can be realized in other specific forms without departing from its spirit and essential characteristics. The current embodiment is considered to be exemplary and not restrictive in all aspects, and the scope of the present invention is defined by the appended claims rather than the above description, and all changes falling within the meaning of the claims and the scope of equivalents are thus included in the scope of the present invention.

Claims

1. A circuit breaker, characterized in that: It includes at least an insulating housing and internal components. The internal components at least include an arcing contact piece, a static contact, a moving contact, an operating mechanism, a connecting conductor, and at least one U-shaped or C-shaped yoke. The connecting conductor is electrically connected to the moving contact. The at least one U-shaped or C-shaped yoke is sleeved on the connecting conductor. The opening direction of the U-shaped or C-shaped yoke faces the magnetic conductive part of the moving contact and / or the arcing contact piece.

2. The circuit breaker according to claim 1, characterized in that: The connecting conductor is simultaneously connected to the arcing contact piece.

3. The circuit breaker according to claim 1, characterized in that: The connecting conductor is a rigid conductor or a flexible conductor.

4. The circuit breaker according to claim 3, characterized in that: When the connecting conductor is a rigid conductor, its conductor material is a copper conductor or an alloy conductor.

5. The circuit breaker according to claim 1, characterized in that: Wiring terminals are arranged at both ends of the circuit breaker. The wiring terminals are directly or indirectly connected to the connecting conductor.

6. The circuit breaker according to claim 1, characterized in that: The arcing contact piece is made of a magnetic conductive metal material.

7. The circuit breaker according to claim 1, characterized in that: The shape of the magnetic conductive part on the moving contact is U-shaped, C-shaped, sheet-shaped, or at least one of a bent shape or a curved shape and combinations thereof.

8. The circuit breaker according to claim 1, characterized in that: The opening of the yoke is adjacent to or close to the arcing member.

9. The circuit breaker according to claim 1, characterized in that: When the opening of the yoke faces the magnetic conductive part on the moving contact, it is in a separated state when the moving contact and the static contact are closed, and is in an adjacent or closed state when the moving contact and the static contact are opened.

10. The circuit breaker according to claim 1, characterized in that: The end shape of the opening position of the yoke is one of a straight edge, an inclined edge, an arc, and a special shape.

11. The circuit breaker according to claim 1, characterized in that: The connecting conductor surrounds at least half a turn around the root of the U-shaped yoke.

12. The circuit breaker according to claim 1, characterized in that: An insulating plate is locally arranged on the arcing member. The insulating plate is not conductive to the arc generated when the moving contact and the static contact are opened.

13. The circuit breaker according to claim 1, characterized in that: The arcing member can also be a split fork structure.

14. The circuit breaker according to claim 13, characterized in that: The opening position of the yoke corresponds to the fork of the arcing member.

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