Arc extinguishing mechanism and circuit breaker

Abstract

The invention discloses an arc extinguishing mechanism and a circuit breaker, the arc extinguishing mechanism comprises a moving contact, a static contact and two permanent magnet groups, one end of the static contact is provided with a static contact, the moving contact can rotate relative to the static contact to realize contact or separation with the static contact, the number of the permanent magnet groups is two, the two permanent magnet groups are respectively arranged on two opposite sides of the static contact, at least two permanent magnets are arranged in each permanent magnet group, the polarities of the two adjacent permanent magnets in each permanent magnet group towards one end of the static contact are different, the polarities of the two opposite permanent magnets in the two permanent magnet groups towards one end of the static contact are different, and the polarities of the two permanent magnets in each permanent magnet group towards one end of the static contact are different. The connecting line of the two permanent magnets which are oppositely arranged in the two permanent magnet groups intersects with a plane formed by the moving trajectory of the moving contact; according to the arc extinguishing mechanism, at least two magnetic fields with opposite directions are formed between the static contact and the moving contact, so that an arc track between the static contact and the moving contact is lengthened to the greatest extent, and the breaking capacity of the circuit breaker in a limited space is improved.

Description

Technical Field

[0001] The present application relates to the technical field of electrical switches, and in particular to an arc extinguishing mechanism and a circuit breaker. Background Art

[0002] The breaking capacity of a circuit breaker refers to the maximum short-circuit current value that can be broken by the circuit breaker under the premise that the circuit breaker is not damaged in any way when a short-circuit fault occurs. It is an extremely important indicator of the circuit breaker. At present, in order to improve the breaking capacity of the circuit breaker, technical means such as enhancing the magnetic field to promote the arc are generally used. In the technical means of enhancing the magnetic field, a pair of parallel permanent magnets or a pair of permanent magnets with opposite polarities are set in the arc extinguishing system of the circuit breaker, and the permanent magnets are used to lengthen the arc when the circuit breaker is broken, thereby shortening the breaking time of the arc. However, in the case of only setting a pair of parallel permanent magnets, at the position where the magnetic field intensity is the largest, most of the magnetic flux lines are parallel to the direction of the arc movement, which has little effect on the arc, and the effect of lengthening the arc during breaking is limited, and the breaking capacity is not ideal. In the case of only setting a pair of permanent magnets with opposite polarities, the direction of the input current needs to be limited. If the input current direction is opposite, not only the arc cannot be extinguished, but the moving contact may also be burned, resulting in an accident.

[0003] It can be seen that the existing technology still needs to be improved and enhanced. Summary of the invention

[0004] In view of the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide an arc extinguishing mechanism and a circuit breaker, aiming to solve at least one of the above-mentioned technical problems in the prior art.

[0005] In order to achieve the above objectives, this application adopts the following technical solutions:

[0006] On one hand, the present application discloses an arc extinguishing mechanism, comprising:

[0007] A stationary contact, one end of which is provided with a stationary contact point;

[0008] A moving contact, capable of rotating relative to the stationary contact to achieve contact or separation with the stationary contact;

[0009] There are two permanent magnet groups, which are respectively arranged on opposite sides of the static contact, each of which is provided with at least two permanent magnets, and the polarities of the two adjacent permanent magnets in each permanent magnet group facing one end of the static contact are different, the polarities of the two permanent magnets arranged opposite to each other in the two permanent magnet groups facing one end of the static contact are different, and the line connecting the two permanent magnets arranged opposite to each other in the two permanent magnet groups intersects with the plane formed by the moving trajectory of the moving contact.

[0010] In some embodiments of the present application, the arc extinguishing mechanism also includes a partition, and the partition is provided in two groups. The two groups of partitions are respectively arranged on opposite sides of the static contact, and each group of partitions is respectively provided with a permanent magnet group, and the swinging end of the moving contact can move between the two groups of partitions.

[0011] In some embodiments of the present application, the arc extinguishing mechanism further includes a plurality of grid plates, and the plurality of grid plates are respectively connected to the two groups of partition plates and are stacked between the two groups of partition plates.

[0012] In some embodiments of the present application, the permanent magnet is disposed between the grid and the moving contact, and is located above the static contact.

[0013] In some embodiments of the present application, a plurality of positioning grooves are provided on the partition plate, and the grid plates are correspondingly connected to the positioning grooves.

[0014] In some embodiments of the present application, a positioning hole is provided in the positioning groove, and the grille includes a base and legs provided on both sides of the base, the legs extend between the two groups of partitions and are connected to the positioning groove, and a protrusion is formed on the outer side of the leg, and the protrusion is inserted into the positioning hole to fix the grille on the partition.

[0015] In some embodiments of the present application, a receiving groove is provided on the side wall of the partition facing the static contact, and the permanent magnet is inserted into the receiving groove.

[0016] In some embodiments of the present application, the partition is an insulating member made of a gas-generating material.

[0017] The present application also discloses a circuit breaker, comprising:

[0018] An arc extinguishing system, comprising the arc extinguishing mechanism as described in any one of the above items;

[0019] The operating mechanism is transmission-connected with the moving contact of the arc extinguishing mechanism, and can drive the moving contact to rotate, so as to achieve contact or separation between the moving contact and the static contact.

[0020] In some embodiments of the present application, the arc extinguishing system further includes:

[0021] There are two insulating plates, which are arranged between the two legs of the grid of the arc extinguishing mechanism, and the moving contact is located between the two insulating plates.

[0022] Beneficial effects:

[0023] The arc extinguishing mechanism provided by the present application is achieved by arranging a group of permanent magnets on opposite sides of a static contact, and each group of permanent magnets includes at least two permanent magnets, the polarities of the two adjacent permanent magnets in each group of permanent magnets are different, the polarities of the two permanent magnets in different groups and arranged oppositely are also different, and the line connecting the two permanent magnets arranged oppositely in the two groups of permanent magnets intersects with the plane formed by the moving trajectory of the moving contact, so that the permanent magnets form at least two magnetic fields in opposite directions between the static contact and the moving contact, when the arc extinguishing mechanism is disconnected, the trajectory of the arc is deflected by the action of the magnetic field, thereby lengthening the trajectory of the arc, and when the arc enters another magnetic field from one magnetic field, the direction of the magnetic field changes, so the arc trajectory changes in the opposite direction, further lengthening the arc trajectory, accelerating the arc extinction, and thus improving the breaking capacity; in addition, the magnetic field formed by the permanent magnet group is not limited by the current input direction, and has high applicability.

[0024] The circuit breaker provided in the present application, including the above-mentioned arc extinguishing mechanism, can achieve rapid arc extinguishing in a limited space, ensure the breaking effect, and have high reliability. BRIEF DESCRIPTION OF THE DRAWINGS

[0025] Figure 1 A schematic diagram of the structure of an arc extinguishing mechanism provided in one embodiment of the present application.

[0026] Figure 2 A schematic structural diagram of an arc extinguishing mechanism provided in another embodiment of the present application.

[0027] Figure 3 A cross-sectional schematic diagram of an arc extinguishing mechanism provided in one embodiment of the present application.

[0028] Figure 4 A schematic structural diagram of an arc extinguishing mechanism provided in yet another embodiment of the present application.

[0029] Figure 5 A schematic diagram of the arc trajectory when a forward current is passed through the arc extinguishing mechanism provided in one embodiment of the present application.

[0030] Figure 6 A schematic diagram of the arc trajectory when a reverse current is passed through the arc extinguishing mechanism provided in one embodiment of the present application.

[0031] Figure 7 A schematic diagram of the forces acting on charged particles in an arc extinguishing mechanism provided in one embodiment of the present application.

[0032] Figure 8 A schematic structural diagram of a partition provided in one embodiment of the present application.

[0033] Fig. 9 A schematic structural diagram of a partition provided in another embodiment of the present application.

[0034] Explanation of main component symbols: 1. static contact; 11. static contact; 2. moving contact; 21. moving contact; 3. permanent magnet group; 31. permanent magnet; 4. partition; 41. positioning groove; 42. positioning hole; 43. accommodating groove body; 5. grid; 51. base; 52. leg; 53. protrusion; 6. insulating plate; 100. first magnetic field; 200. second magnetic field; 300. arc trajectory of the present application; 400. arc trajectory without permanent magnet; A. Lorentz force; B. air blowing; C. magnetic lines of force; D. direction of current movement; F. resultant force. DETAILED DESCRIPTION

[0035] The present application provides an arc extinguishing mechanism and a circuit breaker. To make the purpose, technical solution and effect of the present application clearer and more specific, the present application is further described in detail with reference to the accompanying drawings and examples. It should be understood that the specific examples described here are only used to explain the present application and are not used to limit the present application.

[0036] In the description of the present application, it should be understood that the terms "upper", "lower", "left", "right", etc. indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present application and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, and a specific orientation structure and operation, and therefore, cannot be understood as a limitation on the present application. In addition, "first" and "second" are only for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of the present application, unless otherwise specified, "multiple" means two or more.

[0037] In the description of this application, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection, an electrical connection, or mutual communication; it can be a direct connection, or an indirect connection through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0038] The rapid economic development has led to a rapid increase in electricity demand, and the increasing attention to energy conservation and emission reduction has required low-voltage circuit breakers, which are the main switches of low-voltage power distribution systems, to be small in size and high in performance. The breaking capacity is an important indicator of a circuit breaker. In order to improve the breaking capacity of a circuit breaker in a limited space, the present application provides a circuit breaker, which forms multiple magnetic fields in different directions by setting a permanent magnet group 3 in the arc extinguishing mechanism, changing the motion trajectory of the arc during the breaking, so that the motion trajectory of the arc is elongated, accelerating the arc extinguishing, and thus improving the breaking effect.

[0039] Among them, see Figures 1 to 7 The arc extinguishing mechanism includes a static contact 1, a moving contact 2 and a permanent magnet group 3.

[0040] A static contact 11 is provided at one end of the static contact 1. Specifically, one end of the static contact 1 is bent toward the other end to form a bent portion. The static contact 11 is provided on the upper surface of the bent portion and is arranged opposite to the swinging end of the moving contact 2. One end of the moving contact 2 is transmission-connected to the operating mechanism of the circuit breaker and can rotate relative to the static contact 1 so that its swinging end approaches or moves away from the static contact 11, thereby contacting or separating from the static contact 11, thereby closing or disconnecting the circuit breaker. Specifically, a moving contact 21 is provided on the swinging end of the moving contact 2. As the moving contact 2 swings, the moving contact 21 can contact or separate from the static contact 11 on the static contact 1, thereby closing or disconnecting the circuit breaker.

[0041] The arc extinguishing mechanism also includes a base (not shown in the figure), and the static contact 1 is connected to the base. The base is made of insulating material, which can improve the insulation performance of the arc extinguishing mechanism and reduce the possibility of deformation of the base due to heat.

[0042] The moving trajectory of the moving contact 2 forms a reference plane. Two permanent magnet groups 3 are provided. One permanent magnet group 3 is provided on each side of the reference plane, that is, the two permanent magnet groups 3 are respectively located on the opposite sides of the stationary contact 1. Each permanent magnet group 3 is provided with at least two permanent magnets 31. The polarities of the two adjacent permanent magnets 31 in each permanent magnet group 3 facing the end of the stationary contact 1 are different. The polarities of the two permanent magnets 31 oppositely arranged in the two permanent magnet groups 3 facing the end of the stationary contact 1 are different, and the connecting line of the two permanent magnets 31 oppositely arranged in the two permanent magnet groups 3 intersects with the reference plane formed by the moving trajectory of the moving contact 2. For example, as Figure 4As shown, when each permanent magnet group 3 includes two permanent magnets 31, the first permanent magnet 31 in the permanent magnet group 3 located on the first outer side of the static contact 1 has an S pole at one end facing the static contact 1, and the second permanent magnet 31 in the same group has an N pole at one end facing the static contact 1; correspondingly, the first permanent magnet 31 in the permanent magnet group 3 located on the second outer side of the static contact 1 has an N pole at one end facing the static contact 1, and the second permanent magnet 31 in the group has an S pole at one end facing the static contact 1; wherein the second outer side is arranged corresponding to the first outer side. For another example, when each permanent magnet group 3 includes three permanent magnets 31, the first permanent magnet 31 in the permanent magnet group 3 located on the first outer side of the static contact 1 has an N pole at one end facing the static contact 1, the second permanent magnet 31 in the same group has an S pole at one end facing the static contact 1, and the third permanent magnet 31 has an N pole at one end facing the static contact 1; correspondingly, the first permanent magnet 31 in the permanent magnet group 3 located on the second outer side of the static contact 1 has an S pole at one end facing the static contact 1, the second permanent magnet 31 in the group has an N pole at one end facing the static contact 1, and the third permanent magnet 31 has an S pole at one end facing the static contact 1; wherein the second outer side is arranged corresponding to the first outer side.

[0043] In the above arc extinguishing mechanism, the permanent magnet groups 3 are arranged with opposite poles to form a static magnetic field. When the circuit breaker is disconnected, the charged particles pass through the magnetic field formed by the permanent magnet group 3, and the arc trajectory is deflected by the Lorentz force generated by the magnetic field, so that the arc trajectory is elongated, which is beneficial for the grid 5 to cool the arc and accelerate the arc extinguishing. Further, a pair of permanent magnets 31 arranged oppositely in the permanent magnet group 3 form a magnetic field, that is, two permanent magnet groups 3 form at least two magnetic fields, and because the two adjacent permanent magnets 31 are arranged with opposite poles, the magnetic field directions of the adjacent magnetic fields are opposite. When the charged particles cross two adjacent magnetic fields, the arc trajectory changes in the opposite direction, so that the arc trajectory is stretched to the maximum extent, the arc can be extinguished quickly, and the circuit breaker is quickly disconnected, which effectively solves the problem of improving the circuit breaker's breaking capacity in a limited space.

[0044] like Figure 5 and Figure 6 As shown, Figure 5 This is a schematic diagram of the arc trajectory when a positive current is passed through the circuit breaker (i.e., the current moves from the static contact 1 to the moving contact 2). Figure 6 It is a schematic diagram of the arc trajectory when a reverse current is passed through the circuit breaker (i.e., the current moves from the moving contact 2 to the stationary contact 1); it can be seen from the above two figures that the arc trajectory 300 of the present application is significantly longer than the arc trajectory 400 without a permanent magnet, and whether a forward current or a reverse current is passed, the arc motion trajectory will be elongated, and the direction of the arc motion trajectory will change at the intersection of the two magnetic fields, so the arc extinguishing mechanism in the present application has an arc elongation effect that is not affected by the current flow direction.

[0045] For example, Figure 1 As shown, two permanent magnets 31 are arranged in each permanent magnet group 3, and a positive current (i.e., the current direction moves from the static contact to the moving contact) is passed through the circuit breaker, and the two permanent magnet groups 3 form a first magnetic field 100 close to the static contact 11 and a second magnetic field 200 away from the static contact 11. The magnetic field direction of the first magnetic field 100 is vertical to the paper and downward, and the magnetic field direction of the second magnetic field 200 is vertical to the paper and upward. The magnetic field directions of the first magnetic field 100 and the second magnetic field 200 are respectively perpendicular to the moving direction of the current, and the moving trajectory of the charged particles forms an angle with the magnetic field lines. During the moving process, the charged particles are acted upon by the Lorentz force and have an upward speed; further, when the charged particles enter the second magnetic field 200 from the first magnetic field 100, they are acted upon by a Lorentz force in the opposite direction to the first magnetic field 100, and the arc trajectory moves in the opposite direction, which greatly lengthens the moving trajectory of the arc, thereby accelerating the extinction of the arc.

[0046] The material of the permanent magnet 31 can be selected from one of alloy permanent magnet materials or ferrite permanent magnet materials. For example, the alloy permanent magnet material can be selected from one of neodymium iron boron alloy, samarium cobalt alloy or nickel cobalt alloy.

[0047] Further, such as Figure 1 and Figure 2 As shown, the arc extinguishing mechanism also includes a partition 4, and the partition 4 is provided with two groups. The two groups of partitions 4 are respectively arranged on the opposite sides of the static contact 1, and the two groups of partitions 4 form oppositely arranged side walls. Each group of partitions 4 is respectively provided with a permanent magnet group 3 on its side wall opposite to the other group of partitions 4. The two permanent magnet groups 3 are arranged oppositely, and a permanent magnet 31 in one permanent magnet group 3 forms a magnetic field with a corresponding permanent magnet 31 in the other permanent magnet group 3. The swing end of the moving contact 2 can move between the two groups of partitions 4. An accommodating space is formed between the two groups of partitions 4, and the static contact 11 is located in the accommodating space. The swing end of the moving contact 2 extends into the accommodating space and can swing in the accommodating space, thereby achieving contact or separation with the static contact 11.

[0048] like Figure 1 and Figure 2 As shown, the arc extinguishing mechanism further includes a plurality of grid plates 5, which are respectively connected to the two groups of partition plates 4 and are stacked between the two groups of partition plates 4; adjacent grid plates 5 are equidistantly arranged to form an arc extinguishing chamber.

[0049] Furthermore, the permanent magnet 31 is disposed between the grid 5 and the moving contact 2, and is located above the static contact 11, so that the arc generated between the static contact 1 and the moving contact 2 moves quickly to the arc extinguishing chamber, which is beneficial for the arc extinguishing grid 5 to cool the arc and accelerate the arc extinguishing. Preferably, at least one permanent magnet 31 in each permanent magnet group 3 is disposed at the front end of the static contact 11 in the direction toward the grid 5; the arc voltage at this position is the highest, and the arc force is the greatest, so that the acceleration of the arc movement is also greater, the arc movement speed is increased, and the arc extinguishing efficiency is improved.

[0050] like Figure 8 As shown, a plurality of positioning grooves 41 are provided on the side walls of the two groups of partitions 4 that are arranged opposite to each other. The positioning grooves 41 are arranged along the stacking direction of the grid sheets 5 , and the grid sheets 5 are connected to the positioning grooves 41 accordingly, so as to facilitate the connection and fixation of the grid sheets 5 .

[0051] like Figure 2 , Figure 3 as well as Fig. 9 As shown, further, a positioning hole 42 is provided in the positioning groove 41, and the grid piece 5 includes a base 51 and legs 52 provided on both sides of the base 51. The base 51 of the grid piece 5 is provided on the side away from the static contact 11. The two legs 52 of the grid piece 5 extend between the two groups of partitions 4 respectively, and the two legs 52 are respectively connected to the corresponding positioning grooves 41 in the two groups of partitions 4, and a protrusion 53 is formed on the outer side of the leg 52, and the protrusion 53 is inserted into the positioning hole 42, so that the grid piece 5 is fixed on the partition 4, which can prevent the grid piece 5 from shifting and affecting the arc extinguishing effect of the arc extinguishing chamber. A gap is provided between the two legs 52 of the grid piece 5, and the swing end of the moving contact 2 can swing between the two legs 52 of the grid piece 5 under the drive of the operating mechanism to achieve contact or separation with the static contact 11.

[0052] like Figure 8 and Fig. 9 As shown, a receiving slot 43 is provided on one side of the partition 4 facing the static contact 1, and the permanent magnet 31 is inserted into the receiving slot 43. The partition 4 is made of insulating material, and the permanent magnet 31 is inserted into the receiving slot 43, so that the permanent magnet 31 can not only be fixed by the receiving slot 43, but also can be isolated from the high temperature generated when the arc burns, and the permanent magnet 31 is prevented from contacting with the grid 5, thereby preventing the permanent magnet 31 from being demagnetized due to high temperature.

[0053] Preferably, the partition 4 is an insulating member made of a gas-generating material. Exemplarily, the gas-generating material is one of PMMA (PolymethyMethacrylate), PA66 (Polyamide, polyhexamethylene adipamide / nylon 66), PETP (Polyethylene Terephthalate), POM (Polyoxymethylene), and PE (Polyethylene).

[0054] The partition plate 4 made of the gas-generating material can generate gas after being eroded by the arc, which increases the pressure in the arc extinguishing chamber. The difference between the pressure and the external atmospheric pressure forms an airflow through the outlet of the arc extinguishing chamber. On the one hand, the airflow can push the arc to move toward the grid 5 and enter the grid 5, and can also perform convection cooling on the arc; on the other hand, the gas generated by the gas-generating material contains H2, which has good thermal conductivity and can cool the arc, reduce the diameter of the arc column, and accelerate the arc. In addition, when the current passes through zero, H2 can increase the recovery strength of the arc gap medium.

[0055] For example, Figure 4 and Figure 7 As shown, two permanent magnets 31 are arranged in each permanent magnet group 3, and a positive current (i.e., the current direction moves from the static contact to the moving contact) is passed through the circuit breaker, and two magnetic fields with opposite directions are formed by the two permanent magnet groups 3. During the movement, the charged particles are subjected to the Lorentz force A generated by the magnetic field and the gas blowing B generated by the partition 4. The direction of the Lorentz force A is perpendicular to the current movement direction D. The Lorentz force A and the gas blowing B form a resultant force F. The movement trajectory of the charged particles forms an angle with the magnetic force lines C between the two opposite permanent magnets 31 in the permanent magnet group 3, so that the charged particles are subjected to the resultant force F of the Lorentz force A and the gas blowing B during the movement, forming an arc trajectory in a spiral rising curve, which greatly lengthens the movement trajectory of the arc, thereby accelerating the extinction of the arc.

[0056] The present application also discloses a circuit breaker, including an arc extinguishing system and an operating mechanism; the arc extinguishing system includes an arc extinguishing mechanism, the structure of which is as described above and will not be described in detail here. The arc extinguishing mechanism is arranged in a sealed housing, and the housing is filled with insulating gas, such as sulfur hexafluoride, to form a circuit breaker with insulating gas in the arc extinguishing chamber; or the housing is vacuum, forming a vacuum circuit breaker.

[0057] An air outlet is arranged in the shell, and the air outlet can discharge the energy of the arc to prevent the arc extinguishing mechanism from being damaged due to excessive temperature.

[0058] The operating mechanism is connected to the moving contact 2 of the arc extinguishing mechanism by transmission, and can drive the moving contact 2 to rotate, so as to achieve contact or separation between the moving contact 2 and the static contact 11. A transmission mechanism can also be set between the operating mechanism and the arc extinguishing mechanism, and the movement of the operating mechanism is transmitted to the arc extinguishing mechanism through the transmission mechanism, which can increase the possibility of more forms of movement. Exemplarily, the operating mechanism and the arc extinguishing mechanism can be connected by a connecting rod mechanism, which can convert the linear motion of the operating mechanism into the rotational motion of the moving contact 2, providing more possibilities for the layout of various parts in the circuit breaker and optimizing the structure of the circuit breaker.

[0059] The arc extinguishing system further includes an insulating plate 6, at least one insulating plate 6 is provided. In this embodiment, two insulating plates 6 are provided. The two insulating plates 6 are arranged between the two legs 52 of the grid 5 of the arc extinguishing mechanism, and the moving contact 2 is located between the two insulating plates 6. The insulating plate 6 can prevent the moving contact 2 from directly contacting the grid 5, and prevent the grid 5 from deforming due to high temperature and affecting its arc extinguishing effect.

[0060] In summary, the present application arranges two permanent magnet groups on the arc extinguishing mechanism, and the two permanent magnet groups are respectively arranged on opposite sides of the static contact, each permanent magnet group is provided with at least two permanent magnets, and the polarities of two adjacent permanent magnets in the same permanent magnet group facing one end of the static contact are different, and the polarities of the corresponding ends of two permanent magnets relatively arranged in different permanent magnet groups are also different, so that at least two magnetic fields with opposite directions are formed on both sides of the static contact along the movement direction of the arc, so that the arc generated between the moving contact and the static contact changes its movement direction in the opposite direction when the magnetic field that passes first enters the magnetic field that passes later, and the movement trajectory of the arc can be maximally elongated by the permanent magnet group, thereby improving the arc extinguishing effect and thus improving the breaking capacity of the circuit breaker.

[0061] In addition, the partition 4 is an insulating member made of a gas-generating material, so that the partition 4 can generate gas after being eroded by the arc, pushing the arc to move toward the grid 5, and can perform convection cooling on the arc to accelerate the extinction of the arc.

[0062] It should be noted that the static contact 1 and the moving contact 2 provided in the present application can be selected from any suitable existing structures. In order to clearly and briefly describe the technical solution provided in this embodiment, no further description is given here.

[0063] It is understandable that those skilled in the art can make equivalent substitutions or changes based on the technical solution and application concept of the present application, and all these changes or substitutions should fall within the protection scope of the claims attached to the present application.

Claims

1. An arc extinguishing mechanism, characterized in that: include: A stationary contact, one end of which is provided with a stationary contact point; A moving contact, capable of rotating relative to the stationary contact to achieve contact or separation with the stationary contact; There are two permanent magnet groups, which are respectively arranged on opposite sides of the static contact, each of which is provided with at least two permanent magnets, and the polarities of the two adjacent permanent magnets in each permanent magnet group facing one end of the static contact are different, the polarities of the two permanent magnets arranged opposite to each other in the two permanent magnet groups facing one end of the static contact are different, and the line connecting the two permanent magnets arranged opposite to each other in the two permanent magnet groups intersects with the plane formed by the moving trajectory of the moving contact.

2. The arc extinguishing mechanism according to claim 1, characterized in that: The arc extinguishing mechanism also includes: There are two groups of partitions, which are respectively arranged on the opposite sides of the static contact, and each group of partitions is respectively provided with a permanent magnet group, and the swing end of the moving contact can move between the two groups of partitions.

3. The arc extinguishing mechanism according to claim 2, characterized in that: The arc extinguishing mechanism further comprises a plurality of grid plates, wherein the plurality of grid plates are respectively connected to the two groups of partition plates and are stacked between the two groups of partition plates.

4. The arc extinguishing mechanism according to claim 3, characterized in that: The permanent magnet is arranged between the grid sheet and the moving contact and is located above the static contact.

5. The arc extinguishing mechanism according to claim 3, characterized in that: The partition plate is provided with a plurality of positioning grooves, and the grid plates are connected to the positioning grooves accordingly.

6. The arc extinguishing mechanism according to claim 5, characterized in that: A positioning hole is provided in the positioning groove, and the grille includes a base and legs provided on both sides of the base, the legs extend between the two groups of partitions and are connected to the positioning groove, and a protrusion is formed on the outer side of the leg, and the protrusion is inserted into the positioning hole to fix the grille on the partition.

7. The arc extinguishing mechanism according to claim 2, characterized in that: A receiving slot is provided on the side wall of the partition facing the static contact, and the permanent magnet is inserted into the receiving slot.

8. The arc extinguishing mechanism according to claim 2, characterized in that: The partition is an insulating member made of a gas-generating material.

9. A circuit breaker, characterized in that: include: An arc extinguishing system, comprising the arc extinguishing mechanism according to any one of claims 1 to 8; The operating mechanism is transmission-connected with the moving contact of the arc extinguishing mechanism, and can drive the moving contact to rotate, so as to achieve contact or separation between the moving contact and the static contact.

10. The circuit breaker according to claim 9, characterized in that The arc extinguishing system further comprises: There are two insulating plates, which are arranged between the two legs of the grid of the arc extinguishing mechanism, and the moving contact is located between the two insulating plates.

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