Hybrid arc extinguish chamber and low-voltage switch

Abstract

The invention relates to the technical field of low-voltage electric appliances, and particularly discloses a hybrid arc extinguish chamber and a low-voltage switch, and the hybrid arc extinguish chamber comprises a grid arc extinguish assembly and a magnetic arc extinguish assembly which are matched with a contact assembly. The grid plate arc extinguishing assembly and the magnetic arc extinguishing assembly are arranged along the motion path of a moving contact in the contact assembly. Lateral arc extinguishing grooves are formed in the two sides of the moving plane of the moving contact and extend along the moving path. The lateral arc extinguishing grooves and the surface of the magnetic arc extinguishing assembly form a cavity, and the cavity extends along the motion path; the magnetic arc extinguishing assembly is used for enabling an electric arc at the contact assembly to enter the cavity through a magnetic field and deflect towards the lateral arc extinguishing groove. According to the hybrid arc extinguishing chamber and the low-voltage switch provided by the invention, the arc extinguishing capability of the contact assembly can be enhanced, so that the breaking capability of the low-voltage 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 appliances, and in particular to a hybrid arc extinguishing chamber and a low-voltage switch. Background Art

[0002] The latest low-voltage electrical appliance industry standard development plan requires the development of low-voltage electrical appliances to AC2000V and DC3000V. The existing DC1500V low-voltage switch products can no longer meet market requirements and need to be updated. As an important component of the low-voltage switch, the arc extinguishing chamber is used to extinguish the arc generated by the disconnection of the moving contact and the static contact. The arc extinguishing structure of the conventional low-voltage switch generally uses an arc extinguishing chamber structure composed of multiple grids arranged in parallel or radially to extinguish the arc. At present, the method of increasing the grid is generally used to increase the breaking arc voltage. 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 arc breaking 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 a hybrid arc extinguishing chamber and a low-voltage switch, which can enhance the arc extinguishing ability of the contact assembly, thereby effectively improving the breaking ability of the low-voltage switch for DC high voltage.

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

[0005] In the first aspect, an embodiment of the present application provides a hybrid arc extinguishing chamber, comprising a grid arc extinguishing assembly and a magnetic arc extinguishing assembly arranged in cooperation with a contact assembly; the grid arc extinguishing assembly and the magnetic arc extinguishing assembly are arranged along the movement path of a moving contact in the contact assembly; lateral arc extinguishing grooves are arranged on both sides of the moving plane of the moving contact, and the lateral arc extinguishing grooves extend along the movement path; the lateral arc extinguishing grooves and the surface of the magnetic arc extinguishing assembly form a cavity, and the cavity extends along the movement path of the moving contact in the contact assembly; the magnetic arc extinguishing assembly is used to make the arc at the contact assembly enter the cavity and deflect toward the lateral arc extinguishing groove through a magnetic field.

[0006] As an optional implementation, gas producing parts extending along the movement path are arranged on both sides of the movement plane, and the lateral arc extinguishing grooves are arranged on the gas producing parts and open toward the movement plane.

[0007] As an optional implementation, a plurality of reinforcing ribs arranged at intervals along the extending direction of the lateral arc extinguishing groove are arranged in the lateral arc extinguishing groove; the arrangement direction of the reinforcing ribs intersects with the extending direction of the lateral arc extinguishing groove.

[0008] As an optional implementation, the magnetic arc extinguishing assembly includes at least one permanent magnet disposed between the gas producing parts.

[0009] As an optional embodiment, the permanent magnet includes a first permanent magnet and a second permanent magnet; the force applied by the first permanent magnet to the arc is smaller than the force applied by the second permanent magnet to the arc; the grid arc extinguishing assembly, the first permanent magnet and the second permanent magnet are arranged in sequence along the movement path.

[0010] As an optional implementation, a transition grid is provided between the grid arc extinguishing assembly and the magnetic arc extinguishing assembly, and the transition grid is used to transfer the arc to two sides of the cavity.

[0011] As an optional embodiment, the transition grid includes an arc transfer portion; the arc transfer portion is used to guide the arc to the middle of the cavity, and the magnetic arc extinguishing assembly deflects the arc toward the lateral arc extinguishing groove through a magnetic field.

[0012] Furthermore, side tips are provided on both sides of the arc transfer portion; the side tips are symmetrical about the movement plane; the two side tips are respectively located in the two lateral arc extinguishing grooves, for guiding the arc into the lateral arc extinguishing grooves.

[0013] As an optional implementation, a magnetizing block for enhancing the magnetic field is provided on the gas producing member.

[0014] As an optional implementation, the grid arc extinguishing assembly is close to the closing position of the contact assembly; or the magnetic arc extinguishing assembly is close to the closing position of the contact assembly.

[0015] As an optional implementation, there are two grid arc extinguishing assemblies, and the magnetic arc extinguishing assembly is arranged between the two grid arc extinguishing assemblies; or, there are two magnetic arc extinguishing assemblies, and the grid arc extinguishing assembly is arranged between the two magnetic arc extinguishing assemblies.

[0016] In a second aspect, an embodiment of the present application also provides a low-voltage switch, comprising a switch housing, a contact assembly arranged in the switch housing, and a hybrid arc extinguishing chamber as described above; the hybrid arc extinguishing chamber is arranged in the switch housing for extinguishing the arc at the contact assembly.

[0017] The beneficial effects of the embodiments of the present application include:

[0018] The embodiment of the present application provides a hybrid arc extinguishing chamber, including a grid arc extinguishing assembly and a magnetic arc extinguishing assembly arranged in cooperation with a contact assembly; in the embodiment of the present application, the grid arc extinguishing assembly and the magnetic arc extinguishing assembly are arranged along the movement path of the moving contact in the contact assembly, so that the moving contact can pass through the grid arc extinguishing assembly and the magnetic arc extinguishing assembly in sequence during movement, thereby achieving a mixed arc extinguishing effect. In the embodiment of the present application, lateral arc extinguishing grooves are arranged on both sides of the moving contact movement plane, and the lateral arc extinguishing grooves extend along the movement path; the magnetic arc extinguishing assembly is used to deflect the arc at the contact assembly to the lateral arc extinguishing groove through a magnetic field. Since the lateral arc extinguishing grooves of the embodiment of the present application extend along the movement path, the length of the lateral arc extinguishing grooves is elongated and coincides with the movement path of the moving contact. The moving contact passes between the lateral arc extinguishing grooves on both sides during the closing or opening movement, and the magnetic arc extinguishing assembly causes the arc generated at the moving contact to be subjected to a force directed to the lateral arc extinguishing groove through the magnetic field, so that the arc on the moving contact is transferred to the lateral arc extinguishing groove on one side of the movement plane. The lateral arc-extinguishing groove in the embodiment of the present application is long, so that the arc can be effectively transferred to the lateral arc-extinguishing groove for arc extinguishing.

[0019] The embodiment of the present application also provides a low-voltage switch, including a switch housing, a contact assembly disposed in the switch housing, and a hybrid arc extinguishing chamber as described above; the low-voltage switch provided by the embodiment of the present application arranges the hybrid arc extinguishing chamber in the switch housing to extinguish the arc at the contact assembly. The lateral arc extinguishing groove of the hybrid arc extinguishing chamber provided by the embodiment of the present application is long and extends along the moving contact movement path, which can effectively transfer the arc to the lateral arc extinguishing groove for arc extinguishing. The low-voltage switch provided by the embodiment of the present application can effectively improve the breaking capacity of the low-voltage switch for DC high voltage by setting the hybrid arc extinguishing chamber. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] 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.

[0021] Figure 1 This is one of the structural schematic diagrams of the hybrid arc extinguishing chamber of the embodiment of the present application;

[0022] Figure 2 This is the second structural schematic diagram of the hybrid arc extinguishing chamber of the embodiment of the present application;

[0023] Figure 3 This is a schematic diagram of the structure of the arc extinguishing chamber in the prior art that only uses permanent magnets to extinguish arcs;

[0024] Figure 4 This is a schematic diagram of the structure of the arc extinguishing chamber in the prior art that only grid arc extinguishing is used;

[0025] Figure 5 This is the third structural schematic diagram of the hybrid arc extinguishing chamber of the embodiment of the present application;

[0026] Figure 6 This is the fourth structural schematic diagram of the hybrid arc extinguishing chamber of the embodiment of the present application;

[0027] Figure 7 This is the fifth structural diagram of the hybrid arc extinguishing chamber of the embodiment of the present application;

[0028] Figure 8 This is the sixth structural schematic diagram of the hybrid arc extinguishing chamber of the embodiment of the present application.

[0029] Icons: 100-hybrid arc extinguishing chamber; 101-contact assembly; 102-grid arc extinguishing assembly; 103-magnetic arc extinguishing assembly; 104-moving contact; 105-movement path; 106-movement plane; 107-lateral arc extinguishing groove; 108-gas producing part; 109-reinforcement rib; 110-first permanent magnet; 111-second permanent magnet; 112-transition grid; 113-arc transfer part; 114-side tip; 115-magnetization block; 116-arc movement path. DETAILED DESCRIPTION

[0030] 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.

[0031] 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.

[0032] 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.

[0033] 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.

[0034] The latest low-voltage electrical appliance industry standard development plan requires the development of low-voltage electrical appliances to AC2000V and DC3000V. The existing DC1500V low-voltage switch products can no longer meet market requirements and need to be updated. As an important component of the low-voltage switch, the arc extinguishing chamber is used to extinguish the arc generated by the disconnection of the moving contact and the static contact. The arc extinguishing structure of the conventional low-voltage switch generally uses an arc extinguishing chamber structure composed of multiple grids arranged in parallel or radially to extinguish the arc. At present, the method of increasing the grid is generally used to increase the breaking arc voltage. 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 arc breaking voltage of the arc extinguishing chamber a technical bottleneck for DC high-voltage arc extinguishing.

[0035] In order to solve the above technical problems, the embodiment of the present application provides a hybrid arc extinguishing chamber 100 and a low-voltage switch.

[0036] Reference Figure 1 , Figure 2 , Figure 3 as well as Figure 4 As shown, an embodiment of the present application provides a hybrid arc extinguishing chamber 100, including a grid arc extinguishing assembly 102 and a magnetic arc extinguishing assembly 103 which are arranged in cooperation with a contact assembly 101; the grid arc extinguishing assembly 102 and the magnetic arc extinguishing assembly 103 are arranged along a movement path 105 of a moving contact 104 in the contact assembly 101; lateral arc extinguishing grooves 107 are arranged on both sides of a movement plane 106 of the moving contact 104, and the lateral arc extinguishing grooves 107 extend along the movement path 105; the lateral arc extinguishing grooves 107 and the surface of the magnetic arc extinguishing assembly 103 form a cavity, and the cavity extends along the movement path 105 of the moving contact 104 in the contact assembly 101; the magnetic arc extinguishing assembly 103 is used to make the arc at the contact assembly 101 enter the cavity and deflect toward the lateral arc extinguishing grooves 107 through a magnetic field.

[0037] in, Figure 2 FIG. 1 shows the arc movement path 116 in the hybrid arc extinguishing chamber 100 according to the embodiment of the present application.

[0038] It should be noted that the hybrid arc extinguishing chamber 100 provided in the embodiment of the present application sets the lateral arc extinguishing grooves 107 on both sides of the moving contact 104 movement plane 106, that is, when the moving contact 104 moves to the position where the magnetic arc extinguishing assembly 103 is located, the moving contact 104 moves between the two lateral arc extinguishing grooves 107. The force exerted on the arc by the magnetic arc extinguishing assembly 103 can cause the arc to transfer to the lateral arc extinguishing groove 107 on one side. Specifically, according to the left-hand rule, the magnetic field direction of the magnetic arc extinguishing assembly 103 can be set in combination with the flow direction of the arc current, so that the Ampere force acting on the arc can point to the lateral arc extinguishing groove 107 on one side of the movement plane 106.

[0039] For example, refer to Figure 7 and Figure 8 As shown, when the current direction is perpendicular to the paper and outward, the force generated by the magnetic arc extinguishing assembly 103 is directed to the lateral arc extinguishing groove 107 on the first side, so that the arc is transferred to this side. When the current direction is perpendicular to the paper and inward, the force generated by the magnetic arc extinguishing assembly 103 is directed to the lateral arc extinguishing groove 107 on the second side, so that the arc is transferred to this side.

[0040] The embodiment of the present application provides a hybrid arc extinguishing chamber 100, including a grid arc extinguishing assembly 102 and a magnetic arc extinguishing assembly 103 arranged in cooperation with a contact assembly 101; in the embodiment of the present application, the grid arc extinguishing assembly 102 and the magnetic arc extinguishing assembly 103 are arranged along the movement path 105 of the moving contact 104 in the contact assembly 101, so that the moving contact 104 can pass through the grid arc extinguishing assembly 102 and the magnetic arc extinguishing assembly 103 in sequence during movement, thereby achieving a mixed arc extinguishing effect. In the embodiment of the present application, lateral arc extinguishing grooves 107 are arranged on both sides of the moving plane 106 of the moving contact 104, and the lateral arc extinguishing grooves 107 extend along the movement path 105; the magnetic arc extinguishing assembly 103 is used to deflect the arc at the contact assembly 101 toward the lateral arc extinguishing grooves 107 through a magnetic field. Since the lateral arc extinguishing grooves 107 of the embodiment of the present application extend along the movement path 105, the length of the lateral arc extinguishing grooves 107 is elongated and overlaps with the movement path 105 of the moving contact 104. The moving contact 104 passes between the lateral arc extinguishing grooves 107 on both sides during the closing or opening movement, and the magnetic arc extinguishing assembly 103 causes the arc generated at the moving contact 104 to be subjected to a force directed toward the lateral arc extinguishing groove 107 through the magnetic field, so that the arc on the moving contact 104 is transferred to the lateral arc extinguishing groove 107 on one side of the moving plane 106. The lateral arc extinguishing groove 107 of the embodiment of the present application is long, so that the arc can be effectively transferred to the lateral arc extinguishing groove 107 for arc extinguishing.

[0041] Reference Figure 1 and Figure 5As shown, as an optional embodiment, gas producing parts 108 extending along the moving path 105 are arranged on both sides of the moving plane 106, and lateral arc extinguishing grooves 107 are arranged on the gas producing parts 108 and open toward the moving plane 106. The lateral arc extinguishing grooves 107 and the surface of the magnetic arc extinguishing assembly 103 form a cavity, and the cavity extends along the moving path 105 of the moving contact 104 in the contact assembly 101.

[0042] Furthermore, in the embodiment of the present application, gas-producing parts 108 are also provided on both sides of the moving plane 106, and lateral arc-extinguishing grooves 107 are provided on the gas-producing parts 108. In the embodiment of the present application, the gas-producing parts 108 are provided along the moving path 105 of the moving contact 104, and when the lateral arc-extinguishing grooves 107 are provided on the gas-producing parts 108, the lateral arc-extinguishing grooves 107 can be extended along the moving path 105. In the embodiment of the present application, the force generated by the magnetic arc-extinguishing assembly 103 can make the arc enter the lateral arc-extinguishing grooves 107 on the gas-producing parts 108, thereby greatly improving the arc-extinguishing effect of gas blowing.

[0043] Reference Figure 5 As shown, as an optional implementation, a plurality of reinforcing ribs 109 arranged at intervals along the extension direction of the lateral arc extinguishing groove 107 are provided in the lateral arc extinguishing groove 107; the arrangement direction of the reinforcing ribs 109 intersects with the extension direction of the lateral arc extinguishing groove 107.

[0044] Furthermore, in the embodiment of the present application, a plurality of spaced reinforcing ribs 109 are arranged in the lateral arc extinguishing groove 107. The arrangement of the reinforcing ribs 109 can enhance the structural strength of the gas producing part 108, improve the structural stability of the gas producing part 108, and ensure that the lateral arc extinguishing groove 107 on the gas producing part 108 can reliably act on the arc. In addition, the reinforcing ribs 109 intersect with the moving path 105 of the moving contact 104, and can stretch the arc in the lateral direction, further enhancing the arc extinguishing effect.

[0045] As an optional implementation, the magnetic arc extinguishing assembly 103 includes at least one permanent magnet disposed between the gas producing parts 108 .

[0046] In the embodiment of the present application, the magnetic arc extinguishing component 103 is at least one permanent magnet disposed between the gas producing parts 108. It should be noted that when there are multiple permanent magnets, the multiple permanent magnets are arranged along the moving path 105 of the moving contact 104. The number of permanent magnets can be set by technicians in this field as needed, and no special limitation is made here.

[0047] Reference Figure 5As shown, as an optional embodiment, the permanent magnet includes a first permanent magnet 110 and a second permanent magnet 111; the force applied by the first permanent magnet 110 to the arc is smaller than the force applied by the second permanent magnet 111 to the arc; the grid arc extinguishing assembly 102, the first permanent magnet 110 and the second permanent magnet 111 are arranged in sequence along the movement path 105.

[0048] Furthermore, the permanent magnet of the embodiment of the present application includes a first permanent magnet 110 and a second permanent magnet 111. The volume of the first permanent magnet 110 is smaller than that of the second permanent magnet 111, and the first permanent magnet 110 is close to the grid arc extinguishing assembly 102. Since the force generated by the first permanent magnet 110 is small, the arc can be guided to enter from one end of the lateral arc extinguishing groove 107, so that the arc can approach the larger second permanent magnet 111 along the lateral arc extinguishing groove 107, so as to generate a stronger magnetic blowing force for arc extinguishing.

[0049] Reference Figure 2 and Figure 6 As shown, as an optional implementation, a transition grid 112 is provided between the grid arc extinguishing assembly 102 and the magnetic arc extinguishing assembly 103 , and the transition grid 112 is used to transfer the arc to both sides of the moving plane 106 .

[0050] Reference Figure 6 As shown, as an optional embodiment, the transition grid 112 includes an arc transfer portion 113; the arc transfer portion 113 is used to guide the arc to the middle of the cavity, and the magnetic arc extinguishing assembly 103 deflects the arc in the middle of the cavity toward the lateral arc extinguishing groove 107 through the magnetic field.

[0051] Furthermore, side tips 114 are provided on both sides of the arc transfer portion 113 ; the side tips 114 are symmetrical about the movement plane 106 ; the two side tips 114 are respectively located in the two lateral arc extinguishing grooves 107 , and are used to guide the arc into the lateral arc extinguishing grooves 107 .

[0052] The embodiment of the present application can guide the arc to one side of the moving plane 106 of the moving contact 104 through the force generated by the transition grid 112 combined with the magnetic arc extinguishing assembly 103, and perform tip discharge through the side tip 114, so that the arc can effectively enter the lateral arc extinguishing groove 107 on the gas producing part 108, further improving the arc extinguishing effect of the hybrid arc extinguishing chamber 100.

[0053] Reference Figure 5 As shown, as an optional embodiment, a magnetizing block 115 for enhancing the magnetic field is provided on the gas generating member 108. The gas generating member 108 has a groove on one side away from the moving plane 106, and the magnetizing block 115 is installed in the groove of the gas generating member 108.

[0054] The embodiment of the present application can enhance the magnetic field of the magnetic arc extinguishing assembly 103 by setting a magnetizing block 115 on the gas producing component 108, so that the magnetic arc extinguishing assembly 103 can form a stronger force, further improving the arc extinguishing effect of the hybrid arc extinguishing chamber 100.

[0055] Further, see Figure 3 and Figure 4 As shown, the grid arc extinguishing assembly 102 is close to the closing position of the contact assembly 101; or, the magnetic arc extinguishing assembly 103 is close to the closing position of the contact assembly 101.

[0056] Further, there are two grid arc extinguishing assemblies 102 , and the magnetic arc extinguishing assembly 103 is arranged between the two grid arc extinguishing assemblies 102 ; or, there are two magnetic arc extinguishing assemblies 103 , and the grid arc extinguishing assembly 102 is arranged between the two magnetic arc extinguishing assemblies 103 .

[0057] The embodiment of the present application also provides a low-voltage switch, including a switch housing, a contact assembly 101 arranged in the switch housing, and a hybrid arc extinguishing chamber 100 as described above; the hybrid arc extinguishing chamber 100 is arranged in the switch housing and is used to extinguish the arc at the contact assembly 101.

[0058] The lateral arc extinguishing groove 107 of the hybrid arc extinguishing chamber 100 provided in the embodiment of the present application is long and extends along the moving path 105 of the moving contact 104, so that the arc can be effectively transferred to the lateral arc extinguishing groove 107 for arc extinguishing. The low-voltage switch provided in the embodiment of the present application can effectively improve the breaking capacity of the low-voltage switch for DC high voltage through the provision of the hybrid arc extinguishing chamber 100.

[0059] 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. A hybrid arc extinguishing chamber (100), characterized in that: The invention comprises a grid arc extinguishing assembly (102) and a magnetic arc extinguishing assembly (103) which are arranged in cooperation with a contact assembly (101); the grid arc extinguishing assembly (102) and the magnetic arc extinguishing assembly (103) are arranged along a moving path (105) of a moving contact (104) in the contact assembly (101); lateral arc extinguishing grooves (107) are arranged on both sides of a moving plane (106) of the moving contact (104), and the lateral arc extinguishing grooves (107) extend along the moving path (105); the lateral arc extinguishing grooves (107) and the surface of the magnetic arc extinguishing assembly (103) form a cavity, and the cavity extends along the moving path (105); the magnetic arc extinguishing assembly (103) is used to cause an arc at the contact assembly (101) to enter the cavity and deflect toward the lateral arc extinguishing groove (107) through a magnetic field.

2. The hybrid arc extinguishing chamber (100) according to claim 1, characterized in that: Gas producing parts (108) extending along the moving path (105) are arranged on both sides of the moving plane (106); the lateral arc extinguishing groove (107) is arranged on the gas producing part (108) and opens toward the moving plane (106).

3. The hybrid arc extinguishing chamber (100) according to claim 1, characterized in that: A plurality of reinforcing ribs (109) are arranged in the lateral arc-extinguishing groove (107) and are arranged at intervals along the extension direction of the lateral arc-extinguishing groove (107); the arrangement direction of the reinforcing ribs (109) intersects with the extension direction of the lateral arc-extinguishing groove (107).

4. The hybrid arc extinguishing chamber (100) according to claim 1, characterized in that: The magnetic arc extinguishing assembly (103) comprises at least one permanent magnet arranged between the arc extinguishing grooves (107).

5. The hybrid arc extinguishing chamber (100) according to claim 4, characterized in that: The permanent magnets comprise a first permanent magnet (110) and a second permanent magnet (111); the force exerted by the first permanent magnet (110) on the arc is smaller than the force exerted by the second permanent magnet (111) on the arc; the grid arc extinguishing assembly (102), the first permanent magnet (110) and the second permanent magnet (111) are arranged in sequence and at intervals along the movement path (105).

6. The hybrid arc extinguishing chamber (100) according to any one of claims 1 to 5, characterized in that: A transition grid (112) is provided between the grid arc extinguishing assembly (102) and the magnetic arc extinguishing assembly (103), and the transition grid (112) is used to transfer the arc to two sides of the cavity.

7. The hybrid arc extinguishing chamber (100) according to claim 6, characterized in that: The transition grid (112) comprises an arc transfer portion (113); the arc transfer portion (113) is used to guide the arc to the middle of the cavity, and the magnetic arc extinguishing component (103) deflects the arc toward the lateral arc extinguishing groove (107) through a magnetic field.

8. The hybrid arc extinguishing chamber (100) according to claim 7, characterized in that: Side tips (114) are provided on both sides of the arc transfer portion (113); the side tips (114) are symmetrical about the movement plane (106); the two side tips (114) are respectively located in the two side arc extinguishing grooves (107) and are used to guide the arc in the middle of the cavity into the side arc extinguishing groove (107).

9. The hybrid arc extinguishing chamber (100) according to claim 2, characterized in that: The gas generating part (108) is provided with a magnetizing block (115) for enhancing the magnetic field.

10. The hybrid arc extinguishing chamber (100) according to any one of claims 1 to 5 and claims 7 to 9, characterized in that: The grid arc extinguishing assembly (102) is close to the closing position of the contact assembly (101); or the magnetic arc extinguishing assembly (103) is close to the closing position of the contact assembly (101).

11. The hybrid arc extinguishing chamber (100) according to any one of claims 1 to 5 and claims 7 to 9, characterized in that: There are two grid arc extinguishing assemblies (102), and the magnetic arc extinguishing assembly (103) is arranged between the two grid arc extinguishing assemblies (102); or there are two magnetic arc extinguishing assemblies (103), and the grid arc extinguishing assembly (102) is arranged between the two magnetic arc extinguishing assemblies (103).

12. A low voltage switch, characterized in that: It comprises a switch housing, a contact assembly (101) arranged in the switch housing, and a hybrid arc extinguishing chamber (100) according to any one of claims 1 to 11; the hybrid arc extinguishing chamber (100) is arranged in the switch housing and is used to extinguish the arc at the contact assembly (101).

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