Insulation arc extinguishing mechanism and direct current equipment

Abstract

The utility model relates to the technical field of low-voltage electric appliances, and discloses an insulation arc extinguishing mechanism and direct current equipment, and the insulation arc extinguishing mechanism comprises an insulation housing and a plurality of arc extinguishing grid sheets. An arc extinguishing channel is formed in the insulating housing, the arc extinguishing channel is provided with a first channel opening, a second channel opening and a third channel opening, and the first channel opening and the second channel opening are used for allowing the moving contact and the static contact to enter the arc extinguishing channel respectively; the plurality of arc extinguishing grid sheets are installed on the insulating cover shell, the arc extinguishing grid sheets are provided with arc extinguishing grooves, and the arc extinguishing grooves are communicated with the third channel opening; wherein the insulating housing is also provided with a static contact installation structure, and at least one part of the static contact installation structure is located in the arc extinguishing channel and is located between the first channel opening and the second channel opening. According to the insulation arc extinguishing mechanism and the direct current equipment, the number of parts is reduced, the assembly process is simplified, and the manufacturing and processing cost is reduced.

Description

Technical Field

[0001] The present application relates to the technical field of low-voltage electrical appliances, and in particular to an insulating arc extinguishing mechanism and a DC device. Background Art

[0002] DC current has no natural zero crossing point, so DC devices such as DC circuit breakers and DC switches are prone to large arcs when disconnected and are difficult to extinguish. In order to prevent the generated arc from burning the circuit breaker, an arc extinguishing system is generally arranged near the static contact.

[0003] A static contact cover is arranged on the outside of the static contact to prevent the metal parts at the static contact from short-circuiting due to free gas. In the related art, the insulating cover and the static contact cover in the arc extinguishing system are independent structures and are installed in coordination with each other. For example, after the static contact cover is installed, the insulating cover is installed above the static contact cover. However, the static contacts and arc extinguishing systems in these DC devices involve a large number of parts, a complex assembly process, and a high manufacturing cost. Utility Model Content

[0004] In view of this, the present application provides an insulating arc extinguishing mechanism and a DC device, which reduces the number of parts, simplifies the assembly process, and reduces the manufacturing and processing costs.

[0005] This application specifically adopts the following technical solutions:

[0006] On the one hand, an embodiment of the present application provides an insulating arc extinguishing mechanism, the insulating arc extinguishing mechanism comprising an insulating cover and a plurality of arc extinguishing grids;

[0007] An arc extinguishing channel is formed in the insulating housing, and the arc extinguishing channel has a first channel opening, a second channel opening, and a third channel opening, and the first channel opening and the second channel opening are used to allow a moving contact and a static contact to enter the arc extinguishing channel respectively;

[0008] The plurality of arc-extinguishing grids are mounted on the insulating housing, the arc-extinguishing grids have arc-extinguishing grooves, and the arc-extinguishing grooves are communicated with the third channel opening;

[0009] Wherein, a static contact mounting structure is also provided on the insulating housing, and at least a part of the static contact mounting structure is located in the arc extinguishing channel and between the first channel opening and the second channel opening.

[0010] Optionally, the static contact mounting structure includes a positioning portion and an arc blocking portion;

[0011] The positioning portion is arranged at the second passage opening and contacts the static contact to limit the installation position of the static contact on the insulating housing;

[0012] The arc blocking portion is located in the arc extinguishing channel, and is used to cover at least a portion of a side of the static contact facing the first channel opening.

[0013] Optionally, one end of the arc-blocking portion is connected to the edge of the first channel opening, and the other end of the arc-blocking portion is suspended; and / or,

[0014] The arc blocking portion has an arc surface, the shape of which is adapted to the shape of the U-shaped contact portion of the static contact, wherein the U-shaped contact portion of the static contact can extend into the arc extinguishing channel, and a static contact point is arranged on the U-shaped contact portion.

[0015] Optionally, the positioning portion is located outside the arc extinguishing channel, one end of the positioning portion is connected to the edge of the second channel opening, and the other end of the positioning portion is inserted into the first opening on the U-shaped contact portion of the static contact.

[0016] Optionally, a plurality of pairs of plug-in slots are arranged at intervals on the first side wall of the insulating shell, the first side wall is the side wall where the third channel opening of the insulating shell is located, and a pair of the plug-in slots are distributed on opposite sides of the third channel opening;

[0017] The arc-extinguishing grid has a pair of plug-in arms, the arc-extinguishing slot is formed between the pair of plug-in arms, and the multiple pairs of plug-in arms of the multiple arc-extinguishing grids are respectively located in the multiple pairs of plug-in slots.

[0018] Optionally, a slot wall of each of the plug-in slots away from the arc-extinguishing channel extends in a direction away from the arc-extinguishing channel to form a second opening on a second side wall or a third side wall of the insulating housing, and the second side wall and the third side wall are respectively located on both sides of the first side wall and are arranged opposite to each other;

[0019] The insulating arc extinguishing mechanism comprises two arc-isolating plates, which are respectively in contact with the second side wall and the third side wall and are respectively connected with the plurality of arc-extinguishing grids.

[0020] Optionally, at least one plug-in arm of the arc-extinguishing grid is provided with a first connecting portion, and the first connecting portion is located outside the insulating housing through the second opening;

[0021] The arc isolation plate is provided with a second connection portion, and the second connection portion is detachably connected to the first connection portion.

[0022] Optionally, a first limiting portion is provided on the second side wall of the insulating cover, and a second limiting portion is provided on one of the arc isolation plates, and the first limiting portion is cooperatively connected with the second limiting portion to limit the installation position of the arc isolation plate on the second side wall; and / or,

[0023] A third limiting portion is provided on the third side wall of the insulating cover, and a fourth limiting portion is provided on the other arc isolation plate. The third limiting portion is cooperatively connected with the fourth limiting portion to limit the installation position of the arc isolation plate on the third side wall.

[0024] Optionally, the insulating arc extinguishing mechanism also includes a base, on which a moving contact mounting position, a stationary contact mounting position and a partition are provided, the partition is located between the moving contact mounting position and the stationary contact mounting position, and the partition is provided with a third opening for connecting the moving contact mounting position and the stationary contact mounting position, and the third opening is connected to the first channel opening.

[0025] Optionally, a fifth limiting portion is provided on the side of the partition portion facing the static contact mounting position, and a sixth limiting portion is provided on the fourth side wall of the insulating cover shell, and the fifth limiting portion cooperates with the sixth limiting portion to limit the position of the insulating cover shell in the static contact mounting position, wherein the fourth side wall is the side wall on which the first channel opening on the insulating cover shell is located.

[0026] Another aspect of the embodiment of the present application provides a DC device, which includes the insulating arc extinguishing mechanism described in the above aspect.

[0027] Optionally, the DC device is a DC circuit breaker or a DC switch.

[0028] The insulating arc extinguishing mechanism provided in the embodiment of the present application takes an insulating cover as the main body, and an arc extinguishing channel and a first, second and third channel openings are formed on the insulating cover, wherein the first channel opening and the second channel opening respectively allow the moving contact and the static contact to enter the arc extinguishing channel, and make contact and disconnection in the arc extinguishing channel, thereby ensuring that the arc is generated in the arc extinguishing channel and does not leak out; by installing a plurality of arc extinguishing grids on the insulating cover, and connecting the arc extinguishing grooves of the arc extinguishing grids with the third channel opening of the arc extinguishing channel, it is achieved that the arc is led to the arc extinguishing grids after it is generated, thereby ensuring the arc extinguishing effect and arc extinguishing efficiency; in addition, a static contact mounting structure is also formed on the insulating cover, and at least a portion of the static contact mounting structure is located between the first channel opening and the second channel opening, that is, between the moving contact and the static contact, thereby being able to effectively separate the static contact and the moving contact, thereby preventing the generated arc from exiting the arc extinguishing channel backwards and causing a short circuit in the line. Therefore, the insulating cover provided in the embodiment of the present application integrates the insulating cover in the arc extinguishing system and the static contact cover in the contact system, thereby reducing the number of parts in the DC device, simplifying the assembly process, and reducing the manufacturing cost. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying any creative work.

[0030] Figure 1 is an exploded diagram of an insulating arc extinguishing mechanism provided in an embodiment of the present application;

[0031] Figure 2 is a first structural schematic diagram of an insulating cover provided in an embodiment of the present application;

[0032] Figure 3 is along Figure 1 Schematic diagram of the cross-section structure along the AA line;

[0033] Figure 4 is a second structural schematic diagram of an insulating cover provided in an embodiment of the present application;

[0034] Figure 5 is a schematic diagram of the structure of multiple arc-extinguishing grids provided in an embodiment of the present application;

[0035] Figure 6 is a schematic structural diagram of an arc-extinguishing grid provided in an embodiment of the present application;

[0036] Figure 7 It is a schematic diagram of the assembly of the arc-extinguishing grid and the arc-isolating plate provided in the embodiment of the present application;

[0037] Figure 8 is an exploded view of another insulating arc extinguishing mechanism provided in an embodiment of the present application;

[0038] Fig. 9 yes Figure 8 A top view of the insulating arc extinguishing mechanism shown.

[0039] Reference numerals:

[0040] 1. Insulating housing; 11. Arc extinguishing channel; 111. First channel opening; 112. Second channel opening; 113. Third channel opening; 12. Static contact mounting structure; 121. Positioning portion; 122. Arc blocking portion; 1221. Arc surface; 13. First side wall; 131. Insertion slot; 14. Second side wall; 141. Second opening; 142. First limiting portion; 15. Third side wall; 151. Third limiting portion; 16. Fourth side wall; 161. Sixth limiting portion;

[0041] 2. arc extinguishing grid; 21. arc extinguishing groove; 22. plug-in arm; 23. first connecting part;

[0042] 3. arc isolation plate; 31. second connection portion; 32. second limiting portion; 33. fourth limiting portion;

[0043] 4. base; 41. moving contact mounting position; 42. stationary contact mounting position; 43. partition; 431. third opening; 432. fifth limiting portion;

[0044] 5. Stationary contact; 51. U-shaped contact portion; 511. Stationary contact point; 512. First opening. DETAILED DESCRIPTION

[0045] The following will be combined with the drawings in the embodiments of the present application to clearly and completely describe the technical solutions in the embodiments of the present application. Obviously, the described embodiments are part of the embodiments of the present application, not all of the embodiments. Based on the embodiments in the present application, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of this application.

[0046] In addition, the technical features involved in the different embodiments of the present application described below can be combined with each other as long as they do not conflict with each other.

[0047] The embodiment of the present application provides an insulating arc extinguishing mechanism, Figure 1 This is an exploded diagram of the insulation arc extinguishing mechanism. Figure 1 As shown, the insulating arc extinguishing mechanism comprises an insulating housing 1 and a plurality of arc extinguishing grids 2 .

[0048] See also Figure 1 and Figure 2 An arc extinguishing channel 11 is formed inside the insulating housing 1, and the arc extinguishing channel 11 can also be called an arc extinguishing chamber. The arc energy generated when the moving contact and the static contact 5 are disconnected can flow in the arc extinguishing channel 11 and be extinguished. The arc extinguishing channel 11 has a first channel opening 111, a second channel opening 112 and a third channel opening 113, and these three channel openings are respectively arranged on the shell walls on different sides of the insulating housing 1. Among them, the first channel opening 111 corresponds to the position of the moving contact, and the moving contact will enter or exit the arc extinguishing channel 11 through the first channel opening 111 when moving. The second channel opening 112 corresponds to the position of the static contact 5. In this embodiment, the static contact 5 is installed at the second channel opening 112, and the contact on the static contact 5 for contacting and cooperating with the moving contact extends into the arc extinguishing channel 11 through the second channel opening 112. The third channel opening 113 is arranged opposite to the second channel opening 112, and the insulating cover 1 is equipped with a plurality of arc-extinguishing grids 2 at the third channel opening 113, and the arc-extinguishing grooves 21 of these arc-extinguishing grids 2 are connected with the arc-extinguishing channel 11 through the third channel opening 113, so that after the arc is generated, it can be pushed toward the third channel opening 113 by the airflow, and then pushed into the arc-extinguishing grooves 21 of the plurality of arc-extinguishing grids 2 (that is, the arc moves forward) for extinguishing.

[0049] Optionally, the insulating cover 1 is an insulating gas-generating cover, which has good insulation performance and can prevent arc overflow on the one hand; on the other hand, it can generate a large amount of gas in a high temperature environment after the arc is generated, blowing the arc toward the arc-extinguishing grid 2, quickly consuming the energy of the arc to extinguish it. The insulating gas-generating cover can be made of arc-extinguishing gas-generating materials, such as paraffin, waxy materials, and powder materials.

[0050] like Figure 5 As shown, a plurality of arc-extinguishing grids 2 are arranged in sequence along the thickness direction, and the arc-extinguishing grooves 21 of the plurality of arc-extinguishing grids 2 are connected to enclose a space, and the space is used to accommodate the arc pushed by the airflow. Optionally, the shape of the space enclosed by the arc-extinguishing grooves 21 of the plurality of arc-extinguishing grids 2 can be adapted to the shape of the arc, for example, in an arc shape, to ensure a better arc extinguishing effect.

[0051] Continue to see Figure 1 and Figure 2 , a static contact mounting structure 12 is also provided on the insulating housing 1, at least a part of which is located in the arc extinguishing channel 11 and between the first channel opening 111 and the second channel opening 112. For example, the moving contact is arranged on one side of the insulating arc extinguishing mechanism, and the static contact 5 is arranged at the bottom of the insulating arc extinguishing mechanism, then the first channel opening 111 is arranged on the corresponding side wall of the insulating housing 1, and the second channel opening 112 is arranged on the bottom wall of the insulating housing 1, and the moving contact and the static contact 5 can extend into the arc extinguishing channel 11 through the first channel opening 111 and the second channel opening 112 respectively, and make contact and disconnect in the arc extinguishing channel 11. At least a portion of the static contact mounting structure 12 is located in the arc extinguishing channel 11, and can separate or shield the portion between the moving contact and the static contact 5 except the moving contact and the static contact 511. When the arc generated when the moving contact and the static contact 5 are disconnected moves toward the first channel opening 111 (that is, the arc moves backward), the portion of the static contact mounting structure 12 located in the arc extinguishing channel 11 can lengthen the arc, greatly consume the arc energy to cause it to extinguish, thereby avoiding a line short circuit caused by the backward movement of the arc.

[0052] Therefore, the insulating arc extinguishing mechanism provided in the embodiment of the present application is based on the insulating housing 1, and an arc extinguishing channel 11 and first, second and third channel openings 113 are formed on the insulating housing 1, wherein the first channel opening 111 and the second channel opening 112 respectively allow the moving contact and the static contact 5 to enter the arc extinguishing channel 11, and make contact and disconnection in the arc extinguishing channel 11, thereby ensuring that the arc is generated in the arc extinguishing channel 11 and will not leak out; by installing a plurality of arc extinguishing grids 2 on the insulating housing 1, and making the arc extinguishing of the arc extinguishing grids 2 The slot 21 is connected to the third channel opening 113 of the arc extinguishing channel 11, so that the arc is led to the arc extinguishing grid 2 after it is generated, thereby ensuring the arc extinguishing effect and arc extinguishing efficiency; in addition, a static contact mounting structure 12 is formed on the insulating cover 1, and at least a portion of the static contact mounting structure 12 is located between the first channel opening 111 and the second channel opening 112, that is, between the moving contact and the static contact 5, so that the static contact 5 can be effectively separated from the moving contact, and the generated arc is prevented from exiting the arc extinguishing channel 11 backwards and causing a short circuit in the line. Therefore, the insulating cover 1 provided in the embodiment of the present application integrates the insulating cover in the arc extinguishing system with the static contact 5 cover in the contact system, thereby reducing the number of parts in the DC device, simplifying the assembly process, and reducing the manufacturing cost.

[0053] In some embodiments of the present application, Figure 2 As shown, the static contact mounting structure 12 includes a positioning portion 121 and an arc blocking portion 122. The positioning portion 121 is arranged at the second channel opening 112 to limit the installation position of the static contact 5 on the insulating cover 1; the arc blocking portion 122 is located in the arc extinguishing channel 11 to cover at least a portion of the side of the static contact 5 facing the first channel opening 111.

[0054] In some embodiments of the present application, Figure 2 and Figure 3 As shown, one end of the arc blocking portion 122 is connected to the edge of the first channel opening 111, and the other end of the arc blocking portion 122 is suspended. Therefore, the arc blocking portion 122 has elasticity to a certain extent, and when it contacts the surface of the static contact 5 facing the first channel opening 111, there is an interaction force between the arc blocking portion 122 and the surface of the static contact 5, thereby enhancing the arc extinguishing effect and ensuring the arc extinguishing reliability.

[0055] In some examples, such as Figure 1 and Figure 3As shown, the stationary contact 5 has a U-shaped contact portion 51, which extends into the arc extinguishing channel 11 through the second channel opening 112. The U-shaped contact portion 51 is elastic. By arranging the stationary contact point 511 on the U-shaped contact portion 51, when the stationary contact 5 and the moving contact are in contact and mating, a stable contact can be established between the two, thereby improving the reliability of line conduction. Correspondingly, the surface of the arc blocking portion 122 facing the U-shaped contact portion 51 has an arc surface 1221, and the shape of the arc surface 1221 is adapted to the shape of the U-shaped contact portion of the stationary contact 5, thereby ensuring reliable contact between the arc blocking portion 122 and the U-shaped contact portion 51.

[0056] Optionally, the orthographic projection of the arc blocking portion 122 on the opening plane of the second channel opening 112 has an overlapping area with the second channel opening 112 , and is spaced apart from the orthographic projection of the static contact 511 on the opening plane of the second channel opening 112 .

[0057] In some embodiments of the present application, Figure 3 As shown, the positioning portion 121 is located outside the arc extinguishing channel 11 , one end of the positioning portion 121 is connected to the edge of the second channel opening 112 , and the other end of the positioning portion 121 is inserted into the first opening 512 on the U-shaped contact portion 51 of the static contact 5 .

[0058] In some embodiments of the present application, Figure 4 As shown, a plurality of pairs of insertion slots 131 are arranged at intervals on the first side wall 13 of the insulating housing 1. The first side wall 13 is the side wall where the third channel opening 113 of the insulating housing 1 is located, and a pair of the insertion slots 131 are distributed on opposite sides of the third channel opening 113. Figure 5 and Figure 6 As shown, the arc-extinguishing grid 2 has a pair of plug-in arms 22 , the arc-extinguishing slot 21 is formed between the pair of plug-in arms 22 , and the multiple pairs of plug-in arms 22 of the multiple arc-extinguishing grids 2 are respectively located in the multiple pairs of plug-in slots 131 .

[0059] In some embodiments of the present application, Figure 4 As shown, each of the insertion slots 131 extends away from the slot wall of the arc extinguishing channel 11 in a direction away from the arc extinguishing channel 11 to form a second opening 141 on the second side wall 14 or the third side wall 15 of the insulating housing 1. The second side wall 14 and the third side wall 15 are respectively located on both sides of the first side wall 13 and are arranged opposite to each other. Figure 1 As shown, the insulating arc extinguishing mechanism includes two arc-isolating plates 3 , and the two arc-isolating plates 3 are in contact with the second side wall 14 and the third side wall 15 respectively, and are connected to the plurality of arc-extinguishing grids 2 respectively.

[0060] In some embodiments of the present application, Figure 6As shown, at least one plug arm 22 of the arc-extinguishing grid 2 is provided with a first connection portion 23, and the first connection portion 23 is located outside the insulating housing 1 through the second opening 141. Figure 7 As shown, the arc isolation plate 3 is provided with a second connection portion 31 , and the second connection portion 31 is detachably connected to the first connection portion 23 .

[0061] In some examples, the first connection portion 23 and the second connection portion 31 are connected by snapping, wherein the first connection portion 23 is one of a snap block and a snap slot, and the second connection portion 31 is the other of the snap block and the snap slot.

[0062] In some embodiments of the present application, Figure 2 and Figure 7 As shown, a first limiting portion 142 may be provided on the second side wall 14 of the insulating cover 1, and a second limiting portion 32 may be provided on the arc isolation plate 3, and the first limiting portion 142 is cooperatively connected with the second limiting portion 32 to limit the installation position of the arc isolation plate 3 on the second side wall 14.

[0063] In addition, the third limiting portion 151 may be further provided on the third side wall 15 of the insulating cover 1, and the fourth limiting portion 33 may be provided on the other arc isolation plate 3, and the third limiting portion 151 is cooperatively connected with the fourth limiting portion 33 to limit the installation position of the arc isolation plate 3 on the third side wall 15.

[0064] In some embodiments of the present application, Figure 8 As shown, the insulating arc extinguishing mechanism also includes a base 4, on which a moving contact mounting position 41, a stationary contact mounting position 42 and a partition 43 are provided, the partition 43 is located between the moving contact mounting position 41 and the stationary contact mounting position 42, and the partition 43 is provided with a third opening 431 for connecting the moving contact mounting position 41 and the stationary contact mounting position 42, and the third opening 431 is connected to the first channel opening 111.

[0065] In some embodiments of the present application, Figure 8 and Fig. 9 As shown, a fifth limiting portion 432 is provided on the side of the partition portion 43 facing the static contact mounting position 42, and a sixth limiting portion 161 is provided on the fourth side wall 16 of the insulating cover 1, and the fifth limiting portion 432 cooperates with the sixth limiting portion 161 to limit the position of the insulating cover 1 in the static contact mounting position 42, wherein the fourth side wall 16 is the side wall on which the first channel opening 111 is located on the insulating cover 1.

[0066] An embodiment of the present application further provides a DC device, which includes the insulating arc extinguishing mechanism described in any of the above embodiments.

[0067] Since the DC device provided in the embodiment of the present application adopts the above-mentioned insulating arc extinguishing mechanism, the insulating cover in the arc extinguishing system and the static contact 5 cover in the contact system are integrated together while ensuring the arc extinguishing effect, thereby reducing the number of parts in the DC device, simplifying the assembly process, and reducing the manufacturing cost.

[0068] Optionally, the DC device may be a DC circuit breaker or a DC switch.

[0069] In the description of the present application, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicating the orientation or positional relationship, are based on the orientation or positional relationship shown in the 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, be constructed and operated in a specific orientation, and therefore cannot be understood as a limitation on the present application. In addition, the terms "first", "second", "third", etc. are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of the indicated technical features.

[0070] The above description is only for the purpose of facilitating those skilled in the art to understand the technical solution of the present application and is not intended to limit the present application. 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 insulating arc extinguishing mechanism, characterized in that: The insulating arc extinguishing mechanism comprises an insulating housing (1) and a plurality of arc extinguishing grids (2); An arc extinguishing channel (11) is formed in the insulating housing (1), the arc extinguishing channel (11) having a first channel opening (111), a second channel opening (112) and a third channel opening (113), the first channel opening (111) and the second channel opening (112) being used to allow a moving contact and a stationary contact (5) to enter the arc extinguishing channel (11) respectively; The plurality of arc-extinguishing grids (2) are mounted on the insulating housing (1), the arc-extinguishing grids (2) have arc-extinguishing grooves (21), and the arc-extinguishing grooves (21) are connected to the third channel opening (113); The insulating housing (1) is also provided with a stationary contact mounting structure (12), and at least a portion of the stationary contact mounting structure (12) is located in the arc extinguishing channel (11) and between the first channel opening (111) and the second channel opening (112).

2. The insulating arc extinguishing mechanism according to claim 1, characterized in that: The stationary contact mounting structure (12) comprises a positioning portion (121) and an arc blocking portion (122); The positioning portion (121) is arranged at the second channel opening (112) and contacts the stationary contact (5) to limit the installation position of the stationary contact (5) on the insulating housing (1); The arc blocking portion (122) is located in the arc extinguishing channel (11), and is used to cover at least a portion of a side of the static contact (5) facing the first channel opening (111).

3. The insulating arc extinguishing mechanism according to claim 2, characterized in that: One end of the arc blocking portion (122) is connected to the edge of the first channel opening (111), and the other end of the arc blocking portion (122) is suspended; and / or, The arc blocking portion (122) has an arc surface (1221), the shape of the arc surface (1221) is adapted to the shape of the U-shaped contact portion (51) of the static contact (5), wherein the U-shaped contact portion (51) of the static contact (5) can extend into the arc extinguishing channel (11), and a static contact point (511) is provided on the U-shaped contact portion (51).

4. The insulating arc extinguishing mechanism according to claim 3, characterized in that: The positioning portion (121) is located outside the arc extinguishing channel (11), one end of the positioning portion (121) is connected to the edge of the second channel opening (112), and the other end of the positioning portion (121) is inserted into the first opening (512) on the U-shaped contact portion (51) of the static contact (5).

5. The insulating arc extinguishing mechanism according to claim 1, characterized in that: A plurality of pairs of plug-in slots (131) are arranged at intervals on the first side wall (13) of the insulating housing (1); the first side wall (13) is the side wall on which the third channel opening (113) of the insulating housing (1) is located, and a pair of the plug-in slots (131) are distributed on opposite sides of the third channel opening (113); The arc extinguishing grid (2) has a pair of plug-in arms (22), the arc extinguishing slot (21) is formed between the pair of plug-in arms (22), and the multiple pairs of plug-in arms (22) of the multiple arc extinguishing grids (2) are respectively located in the multiple pairs of plug-in slots (131).

6. The insulating arc extinguishing mechanism according to claim 5, characterized in that: Each of the plug-in slots (131) extends away from the slot wall of the arc extinguishing channel (11) in a direction away from the arc extinguishing channel (11) to form a second opening (141) on the second side wall (14) or the third side wall (15) of the insulating housing (1), the second side wall (14) and the third side wall (15) being respectively located on both sides of the first side wall (13) and arranged opposite to each other; The insulating arc extinguishing mechanism comprises two arc-isolating plates (3), the two arc-isolating plates (3) are in contact with the second side wall (14) and the third side wall (15) respectively, and are connected to the plurality of arc-extinguishing grids (2) respectively.

7. The insulating arc extinguishing mechanism according to claim 6, characterized in that: A first connection portion (23) is provided on at least one plug-in arm (22) of the arc-extinguishing grid (2), and the first connection portion (23) is located outside the insulating housing (1) through the second opening (141); The arc isolation plate (3) is provided with a second connecting portion (31), and the second connecting portion (31) is detachably connected to the first connecting portion (23).

8. The insulating arc extinguishing mechanism according to claim 6, characterized in that: A first limiting portion (142) is provided on the second side wall (14) of the insulating housing (1), and a second limiting portion (32) is provided on one of the arc isolation plates (3), the first limiting portion (142) being cooperatively connected with the second limiting portion (32) to limit the installation position of the arc isolation plate (3) on the second side wall (14); and / or, A third limiting portion (151) is provided on the third side wall (15) of the insulating housing (1), and a fourth limiting portion (33) is provided on the other arc isolation plate (3); the third limiting portion (151) is cooperatively connected with the fourth limiting portion (33) to limit the installation position of the arc isolation plate (3) on the third side wall (15).

9. The insulating arc extinguishing mechanism according to claim 1, characterized in that: The insulating arc extinguishing mechanism also includes a base (4), on which a moving contact mounting position (41), a stationary contact mounting position (42) and a partition (43) are provided, wherein the partition (43) is located between the moving contact mounting position (41) and the stationary contact mounting position (42), and the partition (43) is provided with a third opening (431) for connecting the moving contact mounting position (41) and the stationary contact mounting position (42), and the third opening (431) is connected to the first channel opening (111).

10. The insulating arc extinguishing mechanism according to claim 9, characterized in that: A fifth limiting portion (432) is provided on the side of the partition portion (43) facing the stationary contact mounting position (42), and a sixth limiting portion (161) is provided on the fourth side wall (16) of the insulating cover (1), and the fifth limiting portion (432) cooperates with the sixth limiting portion (161) to limit the position of the insulating cover (1) in the stationary contact mounting position (42), wherein the fourth side wall (16) is the side wall on which the first channel opening (111) is located on the insulating cover (1).

11. A DC device, characterized in that: The DC device comprises the insulating arc extinguishing mechanism according to any one of claims 1-10.

12. The DC device according to claim 11, characterized in that: The DC device is a DC circuit breaker or a DC switch.

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