Arc extinguishing structure and circuit breaker

Abstract

The invention relates to the technical field of low-voltage apparatus switches, and particularly discloses an arc extinguishing structure and a circuit breaker, and the arc extinguishing structure comprises an arc extinguishing grid sheet group and a magnetic arc extinguishing assembly which are matched with a contact assembly. The arc extinguishing grid sheet group and the magnetic arc extinguishing assembly are arranged along a motion path of the moving contact, the magnetic arc extinguishing assembly is used for applying an acting force to an electric arc at the contact assembly, and the direction of the acting force intersects with a motion plane of the moving contact in the contact assembly. According to the invention, the arc extinguishing capability of the contact assembly can be enhanced without increasing the volume of the arc extinguishing chamber, so that the breaking capability of the direct current switch to direct current high voltage is effectively improved.

Description

Technical Field

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

[0002] As an important component of low-voltage switches, the arc extinguishing structure is used to extinguish the arc generated by the disconnection of the moving contact and the static contact. The arc extinguishing structure of conventional low-voltage switches generally adopts an arc extinguishing chamber structure composed of multiple grids arranged in parallel or radially. When the switch is opened, the arc is elongated and enters the grid group. Under the action of the grid, the arc is divided to achieve rapid arc extinguishing. With the continuous advancement of technology, low-voltage switches are developing in the direction of high voltage. At present, it is generally adopted to increase the breaking arc voltage by adding grids. Due to the limited space in the direction of contact opening, it is difficult to increase the number of arc extinguishing grids, making how to further increase the breaking arc voltage of the arc extinguishing chamber a technical bottleneck for DC high-voltage arc extinguishing. Summary of the invention

[0003] The purpose of the present application is to provide an arc extinguishing structure and a circuit breaker, which can enhance the arc extinguishing ability of the contact assembly without increasing the volume of the arc extinguishing chamber, thereby effectively improving the breaking ability of the DC switch for DC high voltage.

[0004] The embodiment of the present application is implemented as follows:

[0005] On the one hand, an embodiment of the present application provides an arc extinguishing structure, including an arc extinguishing grid group and a magnetic arc extinguishing assembly for cooperating with a contact assembly; the arc extinguishing grid group and the magnetic arc extinguishing assembly are arranged along the movement path of the moving contact in the contact assembly, and the magnetic arc extinguishing assembly is used to apply a force to the arc at the contact assembly, and the direction of the force intersects with the movement plane of the moving contact in the contact assembly.

[0006] As an optional embodiment, the magnetic arc extinguishing assembly includes an insulating mounting member and a magnetic assembly arranged on the insulating mounting member; the insulating mounting member is provided with an arc extinguishing groove extending along the direction of the force, and the arc extinguishing groove intersects with the movement plane.

[0007] As an optional implementation, the magnetic assembly includes a plurality of permanent magnets; the plurality of permanent magnets are arranged along the movement path of the moving contact; and / or the plurality of permanent magnets are arranged along a direction intersecting with the movement plane.

[0008] As an optional implementation, the magnetic assembly includes at least one permanent magnet, and the magnetic pole direction of the permanent magnet intersects with the movement plane.

[0009] As an optional implementation, the magnetic assembly includes at least one permanent magnet, and the magnetic pole direction of the permanent magnet is parallel to the movement plane.

[0010] As an optional implementation, the magnetic assembly includes one or two permanent magnets symmetrically arranged about the motion plane.

[0011] As an optional implementation, the magnetic arc extinguishing assembly is located on a side of the arc extinguishing grid group away from the static contact in the contact assembly; the magnetic arc extinguishing assembly is used to stretch the arc at the moving contact in the opening position.

[0012] As an optional embodiment, the arc extinguishing grid group is provided with an arc blowing channel connected to the arc extinguishing groove along the movement path; when the moving contact is in the opening position, a part of the moving contact is in the arc blowing channel and the other part is in the arc extinguishing groove.

[0013] As an optional embodiment, the arc extinguishing grid group includes a first grid group and a second grid group arranged along the movement path; the magnetic arc extinguishing assembly is arranged between the first grid group and the second grid group, and is used to stretch the arc in the middle of the contact assembly.

[0014] As an optional implementation, the magnetic arc extinguishing assembly is arranged at one end of the movement path close to the static contact in the contact assembly, and the magnetic arc extinguishing assembly is used to stretch the arc at the static contact.

[0015] As an optional implementation, it further includes a gas producing part; the gas producing part includes a first gas producing part arranged on the arc extinguishing grid group and a second gas producing part arranged on the magnetic arc extinguishing assembly.

[0016] As an optional embodiment, there are three magnetic arc extinguishing assemblies; two of the magnetic arc extinguishing assemblies are arranged at both ends of the arc extinguishing grid group along the movement path, and the other magnetic arc extinguishing assembly is arranged in the middle of the arc extinguishing grid group along the movement path.

[0017] As an optional embodiment, there are two magnetic arc extinguishing components; one magnetic arc extinguishing component is arranged at one end of the arc extinguishing grid group along the movement path, and the other magnetic arc extinguishing component is arranged in the middle of the arc extinguishing grid group along the movement path; or, the two magnetic arc extinguishing components are arranged at both ends of the arc extinguishing grid group along the movement path.

[0018] On the other hand, an embodiment of the present application provides a circuit breaker, comprising a circuit breaker housing, a contact assembly arranged in the circuit breaker housing, and an arc extinguishing structure as described above; the arc extinguishing structure is arranged in the circuit breaker housing, the movement path of the moving contact of the contact assembly is located in the arc extinguishing structure, and the arc extinguishing structure is used to extinguish the arc at the contact assembly.

[0019] The beneficial effects of the embodiments of the present application include:

[0020] The arc extinguishing structure provided in the embodiment of the present application includes an arc extinguishing grid group and a magnetic arc extinguishing assembly for being arranged in cooperation with the contact assembly; the arc extinguishing grid group and the magnetic arc extinguishing assembly of the present application are arranged along the movement path of the moving contact, so that the arc extinguishing grid group and the magnetic arc extinguishing assembly can both extinguish the arc generated by the contact assembly, thereby effectively improving the arc extinguishing ability of the arc extinguishing structure. The magnetic arc extinguishing assembly in the embodiment of the present application is used to apply a force to the arc at the contact assembly, and by intersecting the direction of the force with the movement plane of the moving contact in the contact assembly, the force can stretch the arc to both sides of the movement plane, so that the arc can be extinguished quickly. Compared with the prior art, the arc extinguishing structure provided in the present application can enhance the arc extinguishing ability through the cooperation of the magnetic arc extinguishing assembly without increasing the volume of the arc extinguishing chamber, so the present application can effectively improve the breaking ability of the DC switch for DC high voltage.

[0021] The circuit breaker provided in the embodiment of the present application includes a circuit breaker housing, a contact assembly arranged in the circuit breaker housing, and the arc extinguishing structure as described above; the movement path of the movable contact in the contact assembly of the present application is located in the arc extinguishing structure, and the arc extinguishing structure can act on the arc generated by the contact assembly, realize the arc extinguishing by voltage drop through the arc extinguishing grid group, and realize the compression and elongation of the arc voltage through the magnetic arc extinguishing assembly, so as to realize the rapid extinguishing of the arc. Therefore, the circuit breaker provided in the embodiment of the present application can improve the breaking capacity of DC high voltage electricity. BRIEF DESCRIPTION OF THE DRAWINGS

[0022] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without paying creative work.

[0023] Figure 1 This is one of the structural schematic diagrams of the arc extinguishing structure of the embodiment of the present application;

[0024] Figure 2 This is the second structural diagram of the arc extinguishing structure of the embodiment of the present application;

[0025] Figure 3 This is a schematic diagram of the arc extinguishing principle of the arc extinguishing structure of an embodiment of the present application;

[0026] Figure 4 This is the third structural diagram of the arc extinguishing structure of the embodiment of the present application;

[0027] Figure 5 This is the fourth structural diagram of the arc extinguishing structure of the embodiment of the present application;

[0028] Figure 6 This is the fifth structural diagram of the arc extinguishing structure of the embodiment of the present application;

[0029] Figure 7 This is the sixth structural diagram of the arc extinguishing structure of the embodiment of the present application;

[0030] Figure 8 This is the seventh structural diagram of the arc extinguishing structure of the embodiment of the present application;

[0031] Fig. 9 This is the eighth structural schematic diagram of the arc extinguishing structure of the embodiment of the present application.

[0032] Icons: 100-contact assembly; 101-arc extinguishing grid group; 102-magnetic arc extinguishing assembly; 103-movement path; 104-moving contact; 105-movement plane; 106-insulating mounting piece; 107-magnetic assembly; 108-arc extinguishing groove; 109-first permanent magnet; 110-second permanent magnet; 111-third permanent magnet; 112-static contact; 113-arc blowing channel; 114-first grid group; 115-second grid group; 116-first gas producing part; 117-second gas producing part; 118-magnetic voltage drop area; 119-grid voltage drop area. DETAILED DESCRIPTION

[0033] In order to make the purpose, technical solution and advantages of the embodiments of the present application clearer, the technical solution in the embodiments of the present application will be clearly and completely described below in conjunction with the drawings in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various different configurations.

[0034] Therefore, the following detailed description of the embodiments of the present application provided in the accompanying drawings is not intended to limit the scope of the present application for which protection is sought, but merely represents selected embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in the field without creative work are within the scope of protection of the present application.

[0035] It should be noted that similar reference numerals and letters represent similar items in the following drawings, so once an item is defined in one drawing, it does not need to be further defined and explained in the subsequent drawings. In addition, the terms "first", "second", "third", etc. are only used to distinguish the description and cannot be understood as indicating or implying relative importance.

[0036] In the description of this application, it should also be noted that, unless otherwise clearly specified and limited, the terms "set", "install", "connect", and "connect" 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 or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of 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.

[0037] Reference Figure 1 and Figure 2 As shown, Figure 1 yes Figure 2 In the projection diagram along the direction of the arrow, an embodiment of the present application provides an arc extinguishing structure, including an arc extinguishing grid group 101 and a magnetic arc extinguishing assembly 102 for cooperating with the contact assembly 100; the arc extinguishing grid group 101 and the magnetic arc extinguishing assembly 102 are arranged along the movement path 103 of the moving contact 104, and the magnetic arc extinguishing assembly 102 is used to apply a force to the arc at the contact assembly 100, and the direction of the force intersects with the movement plane 105 of the moving contact 104 in the contact assembly 100.

[0038] It should be noted that the arc extinguishing structure provided in the present application is arranged in cooperation with the contact assembly 100 and extinguishes the arc generated by the contact assembly 100. The arc extinguishing grid group 101 and the magnetic arc extinguishing assembly 102 of the arc extinguishing assembly are arranged along the moving path 103 of the moving contact 104, that is to say, the arc extinguishing grid group 101 and the magnetic arc extinguishing assembly 102 can both process the arc generated by the contact assembly 100. It should be noted that the specific structure of the arc extinguishing grid group 101 can be selected by technicians in this field as needed. Exemplarily, the arc extinguishing grid group 101 is a plurality of U-shaped metal sheets arranged at intervals along the moving path 103 of the moving contact 104. The magnetic arc extinguishing assembly 102 exerts a force on the arc, and the direction of the force intersects with the moving plane 105 of the moving contact 104, so that the arc is stretched laterally to the moving plane 105, thereby achieving the purpose of rapid arc extinguishing.

[0039] It should be noted that the number of the magnetic arc extinguishing assembly 102 and the arc extinguishing grid set 101 can be at least one, and those skilled in the art can set them according to needs, which is not particularly limited here.

[0040] Exemplarily, there are three magnetic arc extinguishing assemblies 102; two of the magnetic arc extinguishing assemblies 102 are arranged at both ends of the arc extinguishing grid group 101 along the moving path 103, and the other magnetic arc extinguishing assembly 102 is arranged in the middle of the arc extinguishing grid group 101 along the moving path 103. Exemplarily, there are two magnetic arc extinguishing assemblies 102; one magnetic arc extinguishing assembly 102 is arranged at one end of the arc extinguishing grid group 101 along the moving path 103, and the other magnetic arc extinguishing assembly 102 is arranged in the middle of the arc extinguishing grid group 101 along the moving path 103; or, two magnetic arc extinguishing assemblies 102 are arranged at both ends of the arc extinguishing grid group 101 along the moving path 103.

[0041] It should be noted that, refer to Figure 3 As shown, the arc extinguishing principle of this application is:

[0042] Each magnetic arc extinguishing assembly 102 can form a magnetic voltage drop region 118 and generate a voltage drop Ua for the arc entering the region; the voltage drops generated by the multiple magnetic arc extinguishing assemblies 102 for the arc in their respective magnetic voltage drop regions 118 are represented as Ua1, Ua2, Ua3…Uan. Each arc extinguishing grid group 101 can form a grid voltage drop region 119 and generate a voltage drop Ub for the arc entering the region; the voltage drops generated by the multiple arc extinguishing grid groups 101 for the arc in their respective grid voltage drop regions 119 are represented as Ub1, Ub2, Ub3…Ubn. Therefore, the total voltage drop U of the arc stretched along the direction of the moving path 103 is the sum of the voltage drop Ua generated by a single magnetic voltage drop region 118 and the voltage drop Ub generated by a single grid voltage drop region 119. The calculation formula for the total voltage drop U of the arc is: U=Ua+Ub; Ua=Ua1+Ua2+Ua3+...Uan; Ub=Ub1+Ub2+Ub3+...Ubn.

[0043] The arc extinguishing structure provided in the embodiment of the present application includes an arc extinguishing grid group 101 and a magnetic arc extinguishing assembly 102 for being arranged in cooperation with the contact assembly 100; the arc extinguishing grid group 101 and the magnetic arc extinguishing assembly 102 of the present application are arranged along the moving path 103 of the moving contact 104, so that the arc extinguishing grid group 101 and the magnetic arc extinguishing assembly 102 can both extinguish the arc generated by the contact assembly 100, thereby effectively improving the arc extinguishing ability of the arc extinguishing structure. The magnetic arc extinguishing assembly 102 in the embodiment of the present application is used to apply a force to the arc at the contact assembly 100, and by intersecting the direction of the force with the moving plane 105 of the moving contact 104 in the contact assembly 100, the force can stretch the arc to one side of the moving plane 105, so that the arc can be extinguished quickly. When the circuit breaker generates an arc in the forward connection state, the force stretches the arc to one side of the moving plane 105; when the circuit breaker generates an arc in the reverse connection state, the force stretches the arc to the other side of the moving plane 105. Compared with the prior art, the arc extinguishing structure provided by the present application can enhance the arc extinguishing ability through the cooperation of the magnetic arc extinguishing component 102 without increasing the volume of the arc extinguishing chamber. Therefore, the present application can effectively improve the breaking ability of the DC switch for DC high voltage and effectively improve the breaking ability for critical current.

[0044] Reference Figure 2 As shown, as an optional embodiment, the magnetic arc extinguishing assembly 102 includes an insulating mounting member 106 and a magnetic assembly 107 disposed on the insulating mounting member 106; Figure 8 and Fig. 9 As shown, an arc extinguishing groove 108 extending along the direction of the force is provided on the insulating mounting member 106 , and the arc extinguishing groove 108 intersects with the movement plane 105 .

[0045] The embodiment of the present application can provide an assembly position for the magnetic component 107 by setting the insulating mounting member 106, thereby realizing a stable setting of the magnetic component 107. The embodiment of the present application sets an arc extinguishing groove 108 on the insulating mounting member 106, so that the magnetic component 107 can guide the arc into the arc extinguishing groove 108 when applying a force to the arc, thereby realizing rapid extinguishing of the arc. It should be noted that the arc extinguishing groove 108 can intersect the moving plane 105 vertically, that is, the moving plane 105 divides the arc extinguishing groove 108 into two parts, and the two parts of the arc extinguishing groove 108 extend to one side of the moving plane 105 respectively.

[0046] Furthermore, the magnetic assembly 107 includes a plurality of permanent magnets; the plurality of permanent magnets are arranged along the moving path 103 of the moving contact 104;

[0047] Different from the above, the plurality of permanent magnets are arranged along a direction intersecting with the motion plane 105. Specifically, the arrangement direction of the permanent magnets may be perpendicular to the motion plane 105.

[0048] Different from the above, the magnetic assembly 107 includes a plurality of permanent magnets; the plurality of permanent magnets are arranged along the moving path 103 of the moving contact 104 ; and the plurality of permanent magnets are arranged along a direction intersecting with the moving plane 105 .

[0049] In the above three implementation schemes, the specific number and magnetic direction of the magnetic components 107 can be selected by those skilled in the art according to needs.

[0050] Exemplarily, the magnetic pole directions of the two magnetic assemblies 107 intersect with the motion plane 105 .

[0051] Reference Figure 4 As shown, as an optional embodiment, the magnetic assembly 107 includes a first permanent magnet 109 and a second permanent magnet 110 fixed on the insulating mounting member 106; the first permanent magnet 109 and the second permanent magnet 110 are symmetrically arranged about the movement plane 105; the magnetic pole directions of the first permanent magnet 109 and the second permanent magnet 110 are both perpendicular to the movement plane 105.

[0052] The magnetic assembly 107 of the embodiment of the present application includes a first permanent magnet 109 and a second permanent magnet 110. By symmetrically arranging the first permanent magnet 109 and the second permanent magnet 110, and making the magnetic pole directions of the first permanent magnet 109 and the second permanent magnet 110 perpendicular to the motion plane 105, the product can achieve non-polarity arc extinguishing. That is to say, when the current flows from the moving contact 104 of the contact assembly 100 to the stationary contact 112 of the contact assembly 100, the magnetic assembly 107 can exert a force on the arc; when the current flows from the stationary contact 112 of the contact assembly 100 to the moving contact 104 of the contact assembly 100, the magnetic assembly 107 can still exert a force on the arc. Exemplarily, the S pole of the first permanent magnet 109 and the S pole of the second permanent magnet 110 are both arranged close to the motion plane 105, and the N pole of the first permanent magnet 109 and the N pole of the second permanent magnet 110 are both arranged away from the motion plane 105. Exemplarily, the N pole of the first permanent magnet 109 and the N pole of the second permanent magnet 110 are both arranged close to the motion plane 105 , and the S pole of the first permanent magnet 109 and the S pole of the second permanent magnet 110 are both arranged away from the motion plane 105 .

[0053] Exemplarily, the magnetic pole directions of the plurality of magnetic assemblies 107 are parallel to the motion plane 105 .

[0054] in, Figure 3 Another arrangement in which the magnetic pole direction is parallel to the motion plane 105 is shown.

[0055] Reference Figure 5 As shown, as an optional implementation, the magnetic assembly 107 includes one or two third permanent magnets 111 symmetrically arranged about the motion plane 105 ; the magnetic pole direction of the third permanent magnet 111 is parallel to the motion plane 105 .

[0056] The magnetic pole direction of the third permanent magnet 111 provided in the embodiment of the present application is parallel to the motion plane 105. Exemplarily, the magnetic component 107 is a third permanent magnet 111 symmetrically arranged about the motion plane 105, and is arranged at one end of the motion path 103 of the moving contact 104, and the third permanent magnet 111 is close to the moving contact 104 in the open state. Exemplarily, the magnetic component 107 is two third permanent magnets 111 symmetrically arranged about the motion plane 105, and the magnetic pole directions of the two third permanent magnets 111 are arranged in parallel. For example, the S poles of the two third permanent magnets 111 face the moving contact 104, or the N poles of the two third permanent magnets 111 face the moving contact 104.

[0057] Reference Figure 2 and Figure 5 As shown, as an optional embodiment, the magnetic arc extinguishing assembly 102 is located on the side of the arc extinguishing grid group 101 away from the static contact 112 in the contact assembly 100; the magnetic arc extinguishing assembly 102 is used to stretch the arc at the moving contact 104 located in the opening position.

[0058] The embodiment of the present application provides a specific setting position of the magnetic arc extinguishing assembly 102. By setting the magnetic arc extinguishing assembly 102 at the moving contact 104 in the opening position, the arc line generated by the moving contact 104 during the opening process enters the arc extinguishing grid group 101 for arc extinguishing; when the moving contact 104 is in the opening position, the arc is stretched laterally toward the moving plane 105 of the moving contact 104 by the force of the magnetic arc extinguishing assembly 102, thereby achieving lateral elongation of the arc. The embodiment of the present application can achieve high voltage arc extinguishing through the cooperation of the arc extinguishing grid group 101 and the magnetic arc extinguishing assembly 102, and can improve the breaking capacity of the DC switch for large current without increasing the volume of the arc extinguishing chamber and the number of arc extinguishing grids.

[0059] It should be noted that when the moving contact 104 is in the open position, it is difficult to guide the arc, and the arc cannot quickly enter the arc extinguishing grid to perform voltage drop arc extinguishing. The magnetic arc extinguishing assembly 102 of the embodiment of the present application can effectively guide the arc of the moving contact 104 at the open position through the arrangement of the arc extinguishing groove 108 and the magnetic assembly 107, and can solve the technical problem of arc ignition difficulty at the end of the moving contact 104 in the open position. The embodiment of the present application can guide the arc into the arc extinguishing groove 108 through the magnetic assembly 107, and lengthen the arc in the arc extinguishing groove 108, so that the arc at the end of the moving contact 104 can be quickly extinguished.

[0060] Reference Figure 1As shown, illustratively, the arc extinguishing grid group 101 is provided with an arc blowing channel 113 connected to the arc extinguishing groove 108 along the moving path 103; when the moving contact 104 is in the opening position, a part of the moving contact 104 is in the arc blowing channel 113 and the other part is in the arc extinguishing groove 108. It should be noted that the part of the moving contact 104 located in the arc extinguishing groove 108 is provided with a convex portion, which extends toward the magnetic component 107, in order to introduce the arc on the moving contact 104 into the magnetic pressure drop area 118 formed by the magnetic component 107, so that the arc can be extinguished quickly.

[0061] Reference Figure 6 and Figure 7 As shown, as an optional implementation, the arc extinguishing grid group 101 includes a first grid group 114 and a second grid group 115 arranged along the moving path 103; the magnetic arc extinguishing assembly 102 is arranged between the first grid group 114 and the second grid group 115, and is used to stretch the arc in the middle of the contact assembly 100. Different from the above embodiment, the embodiment of the present application arranges the magnetic arc extinguishing assembly 102 between the first grid group 114 and the second grid group 115, and the arc in the middle of the moving path 103 of the moving contact 104 can be quickly extinguished by the arrangement of the arc extinguishing groove 108 and the magnetic assembly 107.

[0062] Reference Figure 8 As shown, a specific structural schematic diagram of the arc extinguishing groove 108 is disclosed.

[0063] It should be noted that a grid arc starting angle is set on the second grid group 115. When the arc extends along the moving path 103, the arc passes through the magnetic voltage drop area 118 formed by the magnetic arc extinguishing assembly 102, the second grid group 115 and the grid arc starting angle in sequence. After passing through the grid arc starting angle, the arc passes through the arc extinguishing groove and reaches the arc starting angle of the moving contact 104.

[0064] Based on the above arc extinguishing principle, the first grid plate group 114, the second grid plate group 115 and the magnetic arc extinguishing assembly 102 provided in the embodiment of the present application can respectively generate a voltage drop for the arc entering their corresponding areas, thereby extinguishing the arc quickly.

[0065] As an optional implementation, the magnetic arc extinguishing assembly 102 is arranged at one end of the moving path 103 close to the static contact 112 in the contact assembly 100, and the magnetic arc extinguishing assembly 102 is used to stretch the arc at the static contact 112. Different from the above-mentioned embodiment, the embodiment of the present application arranges the magnetic arc extinguishing assembly 102 at one end close to the static contact 112 in the contact assembly 100, and the arc at the static contact 112 can be quickly extinguished by the arrangement of the arc extinguishing groove 108 and the magnetic assembly 107.

[0066] Reference Figure 7As shown, as an optional implementation, a gas producing part is also included; the gas producing part includes a first gas producing part 116 arranged on the arc extinguishing grid group 101 and a second gas producing part 117 arranged on the magnetic arc extinguishing assembly 102 .

[0067] It should be noted that the specific structures of the first gas producing member 116 and the second gas producing member 117 can be set by those skilled in the art as needed, and are not specifically limited here. The second gas producing member 117 can also be integrated with the insulating mounting member 106 of the magnetic arc extinguishing assembly 102 as needed; or the second gas producing member 117 and the insulating mounting member 106 can be assembled and connected by means of clamping or bolting.

[0068] An embodiment of the present application provides a circuit breaker, including a circuit breaker housing, a contact assembly 100 arranged in the circuit breaker housing, and an arc extinguishing structure as described above; the arc extinguishing structure is arranged in the circuit breaker housing, and the movement path 103 of the moving contact 104 of the contact assembly 100 is located in the arc extinguishing structure, and the arc extinguishing structure is used to extinguish the arc at the contact assembly 100.

[0069] The circuit breaker provided in the embodiment of the present application includes a circuit breaker housing, a contact assembly 100 disposed in the circuit breaker housing, and the arc extinguishing structure as described above; the moving path 103 of the moving contact 104 in the contact assembly 100 of the present application is located in the arc extinguishing structure, and the arc extinguishing structure can act on the arc generated by the contact assembly 100, realize the arc extinguishing by voltage drop through the arc extinguishing grid group 101, and realize the compression and elongation of the arc voltage through the magnetic arc extinguishing assembly 102, so as to realize the rapid extinguishing of the arc. Therefore, the circuit breaker provided in the embodiment of the present application can improve the breaking capacity of DC high voltage electricity.

[0070] The above description is only the preferred embodiment of the present application and is not intended to limit the present application. For those skilled in the art, the present application may have various modifications and variations. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application shall be included in the protection scope of the present application.

Claims

1. An arc extinguishing structure, characterized in that: The invention comprises an arc extinguishing grid group (101) and a magnetic arc extinguishing assembly (102) for being arranged in cooperation with a contact assembly (100); the arc extinguishing grid group (101) and the magnetic arc extinguishing assembly (102) are arranged along a moving path (103) of a moving contact (104) in the contact assembly (100); the magnetic arc extinguishing assembly (102) is used to apply a force to an arc at the contact assembly (100), and the direction of the force intersects with a moving plane (105) of the moving contact (104) in the contact assembly (100).

2. The arc extinguishing structure according to claim 1, characterized in that: The magnetic arc extinguishing assembly (102) comprises an insulating mounting member (106) and a magnetic assembly (107) arranged on the insulating mounting member (106); the insulating mounting member (106) is provided with an arc extinguishing groove (108) extending in the direction of the acting force, and the arc extinguishing groove (108) intersects with the movement plane (105).

3. The arc extinguishing structure according to claim 2, characterized in that: The magnetic component (107) includes a plurality of permanent magnets; the plurality of permanent magnets are arranged along the moving path (103) of the moving contact (104); and / or the plurality of permanent magnets are arranged along a direction intersecting with the moving plane (105).

4. The arc extinguishing structure according to claim 2, characterized in that: The magnetic assembly (107) includes at least one permanent magnet, the magnetic pole direction of which intersects with the motion plane (105).

5. The arc extinguishing structure according to claim 2, characterized in that: The magnetic component (107) comprises at least one permanent magnet, the magnetic pole direction of the permanent magnet being parallel to the motion plane (105).

6. The arc extinguishing structure of the contact assembly (100) according to any one of claims 2 to 5, characterized in that: The magnetic arc extinguishing assembly (102) is located on a side of the arc extinguishing grid group (101) away from the static contact (112) in the contact assembly (100); the magnetic arc extinguishing assembly (102) is used to stretch the arc at the moving contact (104) located at the opening position.

7. The arc extinguishing structure according to claim 6, characterized in that: The arc extinguishing grid group (101) is provided with an arc blowing channel (113) connected to the arc extinguishing groove (108) along the moving path (103); when the moving contact (104) is located at the opening position, a part of the moving contact (104) is located in the arc blowing channel (113) and another part is located in the arc extinguishing groove (108).

8. The arc extinguishing structure according to any one of claims 2 to 5, characterized in that: The arc extinguishing grid group (101) comprises a first grid group (114) and a second grid group (115) arranged along the moving path (103); the magnetic arc extinguishing assembly (102) is arranged between the first grid group (114) and the second grid group (115) and is used to stretch the arc in the middle of the contact assembly (100).

9. The arc extinguishing structure according to any one of claims 2 to 5, characterized in that: The magnetic arc extinguishing assembly (102) is arranged at one end of the moving path (103) close to the stationary contact (112) in the contact assembly (100), and the magnetic arc extinguishing assembly (102) is used to stretch the arc at the stationary contact (112).

10. The arc extinguishing structure according to any one of claims 2 to 5, characterized in that: It also includes a gas producing part; the gas producing part includes a first gas producing part (116) arranged on the arc extinguishing grid group (101) and a second gas producing part (117) arranged on the magnetic arc extinguishing assembly (102).

11. The arc extinguishing structure according to any one of claims 1 to 5, characterized in that: There are three magnetic arc extinguishing components (102); two of the magnetic arc extinguishing components (102) are arranged at two ends of the arc extinguishing grid group (101) along the moving path (103), and the other magnetic arc extinguishing component (102) is arranged in the middle of the arc extinguishing grid group (101) along the moving path (103).

12. The arc extinguishing structure according to any one of claims 1 to 5, characterized in that: There are two magnetic arc extinguishing assemblies (102); one magnetic arc extinguishing assembly (102) is arranged at one end of the arc extinguishing grid assembly (101) along a moving path (103), and the other magnetic arc extinguishing assembly (102) is arranged in the middle of the arc extinguishing grid assembly (101) along the moving path (103); or, the two magnetic arc extinguishing assemblies (102) are arranged at both ends of the arc extinguishing grid assembly (101) along the moving path (103).

13. A circuit breaker, characterized in that: It comprises a circuit breaker housing, a contact assembly (100) arranged in the circuit breaker housing, and an arc extinguishing structure as described in any one of claims 1 to 12; the arc extinguishing structure is arranged in the circuit breaker housing, the movement path (103) of the moving contact (104) of the contact assembly (100) is located in the arc extinguishing structure, and the arc extinguishing structure is used to extinguish the arc at the contact assembly (100).

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