Explosion-proof circuit breaker

Abstract

The utility model discloses an explosion-proof circuit breaker, which comprises a shell and a main loop conductor, and is characterized in that the main loop conductor comprises a first wiring terminal, a first insert nut, a static contact, a second wiring terminal, a second insert nut and a moving contact; the shell is internally provided with an installation space, the static contact and the moving contact are located in the installation space, and the first insert nut and the second insert nut are embedded in the shell; one end of the first insert nut is exposed in the mounting space and is electrically connected with the static contact, and one end of the second insert nut is exposed in the mounting space and is electrically connected with the moving contact; the first wiring terminal is electrically connected with the other end of the first insert nut, the second wiring terminal is electrically connected with the other end of the second insert nut, and the first wiring terminal and the second wiring terminal are both used for external wiring; the main loop conductor is more suitable for the explosion-proof circuit breaker.

Description

Technical Field

[0001] The present application relates to the field of low-voltage switchgear, and in particular to an explosion-proof circuit breaker. Background Art

[0002] Existing explosion-proof circuit breakers often directly place existing small circuit breakers inside explosion-proof covers. Although such a structure can achieve explosion-proof effects, the performance of the circuit breaker is constrained by the structure of the small circuit breaker itself and is difficult to improve.

[0003] There is no doubt that designing an integrated explosion-proof circuit breaker will undoubtedly have more room for improvement compared to a small circuit breaker (because the components of the existing explosion-proof circuit breaker that function as a circuit breaker are all inside the shell of the small circuit breaker itself, and the space between the explosion-proof cover and the small circuit breaker is completely wasted). In designing this integrated explosion-proof circuit breaker, the setting method of the main circuit is a key factor.

[0004] Therefore, how to design a new main circuit conductor structure is an urgent problem to be solved for explosion-proof circuit breakers. Summary of the Invention

[0005] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide an explosion-proof circuit breaker.

[0006] The present application provides: an explosion-proof circuit breaker, which includes a housing and a main circuit conductor, wherein the main circuit conductor includes a first terminal, a first insert nut, a static contact, a second terminal, a second insert nut and a moving contact; the housing has an installation space, the static contact and the moving contact are located in the installation space, and the first insert nut and the second insert nut are embedded in the housing; one end of the first insert nut is exposed in the installation space and is electrically connected to the static contact, and one end of the second insert nut is exposed in the installation space and is electrically connected to the moving contact; the first terminal is electrically connected to the other end of the first insert nut, and the second terminal is electrically connected to the other end of the second insert nut, and the first terminal and the second terminal are both used for external wiring.

[0007] In some embodiments of the present application, the first connecting terminal and the second connecting terminal are screw-type connecting terminals or cage-type connecting terminals.

[0008] In some embodiments of the present application, a first wiring slot and a second wiring slot are further provided on the housing, the first wiring terminal is arranged in the first wiring slot, and the second wiring slot is further arranged in the second wiring slot.

[0009] In some embodiments of the present application, the static contact is fixed to one end of the first insert nut exposed in the installation space to form an electrical connection.

[0010] In some embodiments of the present application, the static contact is connected to the end of the first insert nut exposed in the installation space through a soft connection to form an electrical connection.

[0011] In some embodiments of the present application, the static contact includes a mounting portion, a static connection portion, and a static contact portion; the mounting portion is fixed to one end of the first insert nut exposed in the mounting space; the static connection portion connects the mounting portion and the static contact portion; the static contact portion is used to cooperate with the moving contact or a static contact point that cooperates with the moving contact is provided on the static contact portion.

[0012] In some embodiments of the present application, the two surfaces of the mounting portion in the height direction of the circuit breaker are respectively a first surface and a second surface, the static contact portion and the mounting portion are arranged at an angle, one end of the static contact portion extends beyond the first surface and the extending distance is a first distance, and the other end of the static contact portion extends beyond the second surface and the extending distance is a second distance, and the second distance is smaller than the first distance.

[0013] In some embodiments of the present application, the two surfaces of the mounting portion in the height direction of the circuit breaker are respectively a first surface and a second surface, an arc striking angle is provided at one end of the static contact portion, the straight-line distance between each arc striking angle and the first surface is greater than the straight-line distance between each arc striking angle and the second surface, and the arc striking angle forms an acute angle with the second surface.

[0014] In some embodiments of the present application, the moving contact is connected to one end of the second insert nut exposed in the installation space through a soft connection and / or a hard busbar, forming an electrical connection between the second insert nut and the moving contact; or, it also includes a solenoid, the moving contact is connected to one end of the solenoid through a soft connection and / or a hard busbar, and the end of the second insert nut exposed in the installation space is connected to the other end of the solenoid through a soft connection and / or a hard busbar, forming an electrical connection between the second insert nut and the moving contact.

[0015] In some embodiments of the present application, a solenoid, a first hard conductor and a soft link are further included. The solenoid is arranged between the second insert nut and the moving contact in the length direction of the circuit breaker. The first hard conductor is fixed to one end of the second insert nut exposed in the installation space. The first hard conductor is welded to one end of the solenoid, the other end of the solenoid is welded to one end of the soft link, and the other end of the soft link is welded to the moving contact.

[0016] In some embodiments of the present application, it also includes a solenoid, a first hard conductor, a second hard conductor and a soft link. The solenoid is arranged between the second insert nut and the moving contact in the length direction of the circuit breaker. The first hard conductor is fixed to one end of the second insert nut exposed in the installation space. The first hard conductor is welded to one end of the solenoid, the other end of the solenoid is welded to one end of the second hard conductor, one end of the second hard conductor is welded to one end of the soft link, and the other end of the soft link is welded to the moving contact.

[0017] In some embodiments of the present application, a first adapter plate is fixed on the other end of the first insert nut, the first adapter plate extends into the first terminal, and the first terminal is electrically connected to the first insert nut through the first adapter plate; a second adapter plate is fixed on the other end of the second insert nut, the second adapter plate extends into the second terminal, and the second terminal is electrically connected to the second insert nut through the second adapter plate.

[0018] In some embodiments of the present application, in the length direction of the circuit breaker, the distance between the first insert nut and the second insert nut is a first length distance, the distance between the first terminal and the second terminal is a second length distance, and the second length distance is greater than the first length distance.

[0019] In some embodiments of the present application, the moving contact includes a moving contact portion, a moving connecting portion and a main body portion. The moving contact portion is connected to the main body portion through the moving connecting portion. The moving contact portion is used to contact the static contact or the moving contact portion is provided with a moving contact point that cooperates with the static contact. From the length direction of the circuit breaker, the moving contact portion is closer to the static contact than the main body portion.

[0020] In some embodiments of the present application, the moving contact includes a moving contact portion, a moving connecting portion and a main body portion. The moving contact portion is connected to the main body portion through the moving connecting portion. The moving contact portion is used to contact the static contact or the moving contact portion is provided with a moving contact point that cooperates with the static contact, and the moving connecting portion is provided with an arc-isolating insulating part.

[0021] The beneficial effects of this application include:

[0022] First, the main circuit conductor of this application is directly installed on the explosion-proof housing. Therefore, its design space and design margin are larger, which is the basis for the circuit breaker to have better performance. Secondly, the first insert nut and the second insert nut are used in the housing. The first insert nut and the second insert nut are used as transfer components to achieve the electrical connection between the first terminal and the static contact, and the second terminal and the moving contact, which can effectively ensure the connection between the static contact, the moving contact and the external circuit. Finally, the use of the insert nut transfer method can maximize the overall sealing performance of the circuit breaker to meet explosion-proof requirements. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the embodiments. It should be understood that the following drawings only illustrate certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other relevant drawings can be obtained based on these drawings without any creative work.

[0024] Figure 1 A schematic diagram of an explosion-proof circuit breaker according to embodiment 1 of the present application is shown;

[0025] Figure 2 An exploded view of the explosion-proof circuit breaker according to Example 1 of the present application is shown;

[0026] Figure 3 A cross-sectional view of an explosion-proof circuit breaker according to embodiment 1 of the present application is shown;

[0027] Figure 4 A schematic diagram of the main circuit conductor in the explosion-proof circuit breaker of Example 1 of the present application is shown;

[0028] Figure 5 An axial view of the main circuit conductor in the explosion-proof circuit breaker of Example 1 of the present application is shown;

[0029] Figure 6 A schematic diagram of the moving and static contacts of the explosion-proof circuit breaker in Example 1 of the present application is shown;

[0030] Figure 7 A schematic diagram of the explosion-proof circuit breaker after removing the cover in Example 1 of the present application is shown;

[0031] Figures 8A-8C A schematic diagram of a 2P-4P explosion-proof circuit breaker according to Example 1 of the present application is shown. DETAILED DESCRIPTION

[0032] The following describes in detail embodiments of the present application. Examples of these embodiments are illustrated in the accompanying drawings, where identical or similar reference numerals throughout represent identical or similar elements or elements having identical or similar functions. The embodiments described below with reference to the accompanying drawings are illustrative and intended only to explain the present application and are not to be construed as limiting the present application.

[0033] In the description of the present application, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential", etc., indicating orientations or positional relationships, are based on the orientations or positional relationships shown in the accompanying drawings and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, be constructed and operate in a specific orientation, and therefore should not be understood as limiting the present application.

[0034] Furthermore, the terms "primary" and "secondary" are used for descriptive purposes only and should not be construed as indicating or implying relative importance or implicitly specifying the number of technical features indicated. Therefore, features specified as "primary" or "secondary" may explicitly or implicitly include one or more of such features. In the description of this application, "plurality" means two or more, unless otherwise specifically defined.

[0035] In this application, unless otherwise specified or limited, terms such as "mounted," "connected," "connect," and "fixed" should be interpreted broadly. For example, they may refer to fixed connections, detachable connections, or integration; mechanical connections or electrical connections; direct connections or indirect connections through an intermediate medium; and they may refer to internal communication between two components or the interaction between two components. Those skilled in the art will understand the specific meanings of these terms in this application based on the specific circumstances.

[0036] In this application, unless otherwise expressly specified or limited, "above" or "below" a main feature may mean that the main feature and the second feature are in direct contact, or that the main feature and the second feature are in indirect contact through an intermediary. Furthermore, "above," "above," and "above" a main feature may mean that the main feature is directly above or diagonally above the second feature, or simply means that the main feature is higher in level than the second feature. "below," "below," and "below" a main feature may mean that the main feature is directly below or diagonally below the second feature, or simply means that the main feature is lower in level than the second feature. Example

[0037] like Figure 1-8C As shown, Example 1 of the present application provides an explosion-proof circuit breaker, which is an explosion-proof circuit breaker in which the circuit breaker operating mechanism and the main circuit conductor 200 are both arranged in the outermost housing 100 (unlike the structure of the prior art in which the main circuit conductor 200 is arranged in the circuit breaker housing 100, and the circuit breaker housing 100 is arranged in the outermost housing 100).

[0038] This explosion-proof circuit breaker includes the following structures:

[0039] The housing 100 (also referred to as the casing 100 ) defines an installation space 100 a therein.

[0040] Here, housing 100 includes a cover 101 and a sealing plate 102. The bottom of cover 101 has an installation opening 100ak that communicates with installation space 100a. Sealing plate 102 is used to seal installation opening 100ak. A glue potting structure is located between sealing plate 102 and cover 101, surrounding installation opening 100ak. This improves the sealing performance of housing 100 and meets explosion-proof requirements.

[0041] Here, the installation space 100a within the housing 100 refers to the space within the housing 100 used to accommodate internal components such as the operating mechanism, main circuit conductors 200, and accessories. The size of the internal installation space 100a varies for explosion-proof circuit breakers with different pole numbers, as the number of internal components installed also varies. For a 1P explosion-proof circuit breaker, for example, the internal installation space 100a is a complete space, as a single-pole explosion-proof circuit breaker has only one set of main circuit conductors 200. For explosion-proof circuit breakers with 2P or higher poles (2P, 3P, and 4P), the internal installation space 100a is divided into multiple subspaces. Because multi-pole explosion-proof circuit breakers have multiple sets of main circuit conductors 200, multiple subspaces are required to achieve phase isolation. Although divided into multiple subspaces, the subspaces remain integral to the installation space 100a, and therefore, the installation space 100a can still be considered the space used to accommodate internal components such as the operating mechanism 300, contact system, and accessories 1100.

[0042] The main circuit conductor 200 includes a first terminal 201, a first insert nut 202, a static contact 203, a second terminal 204, a second insert nut 205, and a movable contact 206. The static contact 203 and movable contact 206 are both located within the installation space 100a, while the first insert nut 202 and the second insert nut 205 (both insert nuts) are embedded within the housing 101.

[0043] The first insert nut 202 serves as a transition component for electrically connecting the first terminal 201 to the static contact 203. Specifically, one end of the first insert nut 202 is exposed in the installation space 100a and electrically connected to the static contact 203, while the other end of the first insert nut 202 is electrically connected to the first terminal 201.

[0044] The second insert nut 205 serves as a transition component for electrically connecting the second terminal 204 to the movable contact 206. Specifically, one end of the second insert nut 205 is exposed in the installation space 100a and electrically connected to the movable contact 206, while the other end of the second insert nut 205 is electrically connected to the second terminal 204.

[0045] This structure, utilizing an insert nut as a transfer component, effectively ensures connection between the static contact 203 and the moving contact 206 and the external circuit. Furthermore, the use of an insert nut as a transfer component maximizes the overall sealing performance of the circuit breaker, meeting explosion-proof requirements. Finally, this main circuit conductor 200 can be directly installed within the housing 100, providing greater design space and margin compared to existing technologies, fundamental to improving circuit breaker performance.

[0046] In this embodiment, the first and second terminals 201 and 204 are screw-type terminals with a terminal frame. Alternatively, screw-type terminals without a terminal frame or cage-type terminals may be used. Regardless of the type of terminal, as long as they can connect to external circuits, the explosion-proof circuit breaker can be connected to and protect the external circuit.

[0047] For the first wiring terminal 201 and the second wiring terminal 204, the housing 101 is further provided with a first wiring slot 1010 and a second wiring slot 1020. The first wiring terminal 201 is disposed within the first wiring slot 1010, and the second wiring slot 1020 is further disposed within the second wiring slot 1020. This design allows the first wiring terminal 201 and the second wiring terminal 204 to be stably mated with the housing 101, making the installation more stable.

[0048] The first terminal 201 is electrically connected to the first insert nut 202 via a first adapter plate 2012 (made of conductive material). Specifically, one end of the first adapter plate 2012 extends into and contacts the first terminal 201, while the other end is secured to the first insert nut 202 using screws. Alternatively, the first adapter plate 2012 can be secured to the first insert nut 202 using welding, riveting, or other methods.

[0049] The second terminal 204 is electrically connected to the second insert nut 205 via a second adapter plate 2045 (made of conductive material). Specifically, one end of the second adapter plate 2045 extends into and contacts the second terminal 204, while the other end is secured to the second insert nut 205 using screws. Alternatively, the second adapter plate 2045 can be secured to the first insert nut 202 using welding, riveting, or other methods.

[0050] This structure of connecting the terminal block and the insert nut using the first adapter plate 2012 and the second adapter plate 2045 allows each part to be formed by independent components and then assembled and fixed in sequence during installation.

[0051] From the length direction of the explosion-proof circuit breaker, the distance between the first insert nut 202 and the second insert nut 205 is a first length, and the distance between the first terminal 201 and the second terminal 204 is a second length, which is greater than the first length.

[0052] Such a structural arrangement makes the overall structure more reasonable and also facilitates sufficient distance between the wiring terminal and the insert nut for easy connection.

[0053] The electrical connection between the static contact 203 and the first insert nut 202 can be fixed by a soft connection (in this field, the soft connection is a soft copper wire) or a hard connection.

[0054] Regarding the manner in which the static contact 203 is connected to the first insert nut 202 by a soft connection, the static contact 203 is directly fixed in the housing 101 , and the static contact 203 is connected to the first insert nut 202 by the soft connection to form an electrical connection.

[0055] For hard-connected fixation, the static contact 203 is directly fixed to the first insert nut 202. Screw fastening is employed here. Alternatively, welding, riveting, and other methods can also be employed. This screw fastening method is extremely simple to install, allowing the insert nut to perform both fastening and conducting functions for the static contact 203, effectively simplifying the component count (compared to using two separate structures for both fastening and conducting, this undoubtedly reduces the number of components).

[0056] In this manner, the static contact 203 includes a mounting portion 203a, a static connection portion 203b, and a static contact portion 203c. The mounting portion 203a is used to fix with the first insert nut 202. The specific fixing method has been described above and will not be repeated here.

[0057] The static contact portion 203c is used to fix the static contact 203d (also called the static silver point). The static contact 203d is used to contact the movable contact 206 (if the movable contact 206d is present, it will contact the movable contact 206d; if the movable contact 206d is absent, it will release the movable contact portion 206a). Of course, for solutions without the static contact 203d, the static contact portion 203c can also be used to directly contact the movable contact 206 (if the movable contact 206d is present, it will contact the movable contact 206d; if the movable contact 206d is absent, it will release the movable contact portion 206a).

[0058] Here, the static connection portion 203b is connected to the mounting portion 203a and the static contact portion 203c.

[0059] Such a static contact 203 has a simple structure and is very easy to produce.

[0060] The mounting portion 203a has two surfaces, one at the height of the circuit breaker, namely a first surface S1 and a second surface S2. The static contact portion 203c is positioned at an angle to the mounting portion 203a. In this embodiment, the angle is 90°, although other angles are also possible. One end of the static contact portion 203c extends beyond the first surface S1 by a first distance, while the other end extends beyond the second surface S2 by a second distance, which is smaller than the first distance. The position of the static contact portion 203c is related to the circuit breaker's opening distance (the final distance between the moving and static contacts 203). This arrangement can increase the opening distance.

[0061] The arc-starting angle 203e is connected to one end of the static contact portion 203c and is located below the second surface S2. The straight-line distance between each point of the arc-starting angle 203e and the first surface S1 is greater than the straight-line distance between each point of the arc-starting angle 203e and the second surface S2. Furthermore, the arc-starting angle 203e forms an acute angle with the second surface S2. This design of the arc-starting angle 203e improves arc extinguishing and facilitates arc guidance during disconnection.

[0062] There are many types of electrical connections between the moving contact 206 and the second insert nut 205 .

[0063] As a connection method with a solenoid 207, it includes the solenoid 207, a first rigid conductor 208, a second rigid conductor 209, and a flexible link 210. Viewed along the length of the circuit breaker, the solenoid 207 is positioned between the second insert nut 205 and the movable contact 206. The first rigid conductor 208 is secured to the second insert nut 205 using screws (welding, riveting, or other methods are also possible). Furthermore, a positioning structure is provided between the first rigid conductor 208 and the housing 101. Specifically, the housing 101 has a positioning protrusion 101t, and the first rigid conductor 208 has a corresponding notch 2080 that fits over the positioning protrusion 101t. The first rigid conductor 208 is welded to one end of the solenoid 207 and the second rigid conductor 209. One end of the second rigid conductor 209 is welded to one end of the flexible link 210, and the other end of the flexible link 210 is welded to the movable contact 206. The first rigid conductor 208 and the second rigid conductor 209 described above are both a type of rigid busbar. While this connection method involves more components, it offers a more rational structure and reduces assembly and welding difficulties. Alternatively, the second rigid conductor 209 can be omitted, and the other end of the solenoid 207 can be directly welded to the flexible connection 210. This configuration saves a rigid conductor and a welding point, thus reducing temperature rise.

[0064] Of course, in addition to the above-mentioned specific combination method of soft connection and hard busbar, for the structure with a solenoid 207 (at least for the purpose of realizing the short-circuit protection function), other connection methods can also be used, as long as the moving contact 206 is connected to one end of the solenoid 207 through the soft connection and / or the hard busbar, and the end of the second insert nut 205 exposed in the installation space 100a is connected to the other end of the solenoid 207 through the soft connection and / or the hard busbar.

[0065] For some circuit breakers without solenoid 207, the movable contact 206 is connected to the second insert nut 205 through a soft connection and / or a hard busbar. The specific connection method can refer to the method of the solenoid 207 above, and the solenoid 207 only needs to be omitted.

[0066] The movable contact 206 comprises a movable contact portion 206a, a movable connecting portion 206b, and a main body 206c. The movable contact portion 206a is connected to the main body 206c via the movable connecting portion 206b. This connection of the movable connecting portion 206b results in a slight bend in the movable contact 206 as a whole, bringing the movable contact portion 206a closer to the stationary contact 203 than the main body 206c (as viewed along the length of the circuit breaker). The movable contact portion 206a is used to mount a movable contact point 206d (also called a movable contact point). In solutions without the movable contact point 206d, the movable contact portion 206a may directly contact the stationary contact 203.

[0067] The arc-isolating insulator 206e is fixed to the movable connection portion 206b to prevent arc erosion of the movable connection portion 206b and the main body portion 206c. The arc-isolating insulator 206e is fixed to the movable connection portion 206b by a snap-fit method. Alternatively, riveting, interference fit, screw fastening, or other methods may be used.

[0068] Although the above example illustrates the structure of a single-pole main circuit conductor 200, for a multi-P circuit breaker, its multi-pole main circuit conductors 200 can all adopt the above-mentioned main circuit conductor 200 structure, or the main circuit conductor 200 of one of the poles can adopt the above-mentioned main circuit conductor 200 structure.

[0069] Throughout this specification, reference to terms such as "one embodiment," "some embodiments," "examples," "specific examples," or "some examples" means that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of this application. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples. Furthermore, those skilled in the art may combine and integrate different embodiments or examples, and features of different embodiments or examples, described in this specification, unless otherwise inconsistent.

[0070] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are illustrative and cannot be understood as limitations on the present application. Ordinary technicians in this field can change, modify, replace and modify the above embodiments within the scope of the present application.

Claims

1. An explosion-proof circuit breaker, characterized in that: It includes a shell and a main circuit conductor, and the main circuit conductor includes a first terminal, a first insert nut, a static contact, a second terminal, a second insert nut and a moving contact; there is an installation space in the shell, the static contact and the moving contact are located in the installation space, and the first insert nut and the second insert nut are embedded in the shell; one end of the first insert nut is exposed in the installation space and is electrically connected to the static contact, and one end of the second insert nut is exposed in the installation space and is electrically connected to the moving contact; the first terminal is electrically connected to the other end of the first insert nut, and the second terminal is electrically connected to the other end of the second insert nut, and the first terminal and the second terminal are both used for external wiring.

2. The explosion-proof circuit breaker according to claim 1, characterized in that: The first terminal and the second terminal are screw terminals or cage terminals; And / or, a first wiring slot and a second wiring slot are further provided on the housing, the first wiring terminal is arranged in the first wiring slot, and the second wiring slot is further arranged in the second wiring slot.

3. The explosion-proof circuit breaker according to claim 1, characterized in that: The static contact is fixed to the end of the first insert nut exposed in the installation space to form an electrical connection; Alternatively, the static contact is connected to the end of the first insert nut exposed in the installation space through a soft connection to form an electrical connection.

4. The explosion-proof circuit breaker according to claim 1, characterized in that: The static contact includes a mounting portion, a static connection portion and a static contact portion; the mounting portion is fixed to one end of the first insert nut exposed in the mounting space; the static connection portion connects the mounting portion and the static contact portion; the static contact portion is used to cooperate with the moving contact or a static contact point that cooperates with the moving contact is provided on the static contact portion.

5. The explosion-proof circuit breaker according to claim 4, characterized in that: The two surfaces of the mounting portion in the height direction of the circuit breaker are respectively a first surface and a second surface, the static contact portion and the mounting portion are arranged at an angle, one end of the static contact portion extends beyond the first surface by a first distance, and the other end of the static contact portion extends beyond the second surface by a second distance, and the second distance is smaller than the first distance; Alternatively, the two surfaces of the mounting portion in the height direction of the circuit breaker are respectively the first surface and the second surface, an arc striking angle is provided at one end of the static contact portion, the straight-line distance between each arc striking angle and the first surface is greater than the straight-line distance between each arc striking angle and the second surface, and the arc striking angle forms an acute angle with the second surface.

6. The explosion-proof circuit breaker according to claim 1, characterized in that: The moving contact is connected to the end of the second insert nut exposed in the installation space through a soft connection and / or a hard busbar, thereby forming an electrical connection between the second insert nut and the moving contact; Or, it also includes a solenoid, the moving contact is connected to one end of the solenoid through a soft connection and / or a hard busbar, and the end of the second insert nut exposed in the installation space is connected to the other end of the solenoid through a soft connection and / or a hard busbar, forming an electrical connection between the second insert nut and the moving contact.

7. The explosion-proof circuit breaker according to claim 1, characterized in that: The circuit breaker further comprises a solenoid, a first hard conductor, and a flexible link. The solenoid is arranged between the second insert nut and the movable contact in the length direction of the circuit breaker. The first hard conductor is fixed to one end of the second insert nut exposed in the installation space. The first hard conductor is welded to one end of the solenoid, the other end of the solenoid is welded to one end of the flexible link, and the other end of the flexible link is welded to the movable contact. Or, it also includes a solenoid, a first hard conductor, a second hard conductor and a soft link. The solenoid is arranged between the second insert nut and the moving contact in the length direction of the circuit breaker. The first hard conductor is fixed to one end of the second insert nut exposed in the installation space. The first hard conductor is welded to one end of the solenoid, the other end of the solenoid is welded to one end of the second hard conductor, one end of the second hard conductor is welded to one end of the soft link, and the other end of the soft link is welded to the moving contact.

8. The explosion-proof circuit breaker according to claim 1, characterized in that: A first adapter plate is fixed on the other end of the first insert nut, and the first adapter plate extends into the first terminal. The first terminal is electrically connected to the first insert nut through the first adapter plate; a second adapter plate is fixed on the other end of the second insert nut, and the second adapter plate extends into the second terminal. The second terminal is electrically connected to the second insert nut through the second adapter plate.

9. The explosion-proof circuit breaker according to claim 1, characterized in that: In the length direction of the circuit breaker, the distance between the first insert nut and the second insert nut is a first length distance, the distance between the first wiring terminal and the second wiring terminal is a second length distance, and the second length distance is greater than the first length distance.

10. The explosion-proof circuit breaker according to claim 1, characterized in that: The movable contact comprises a movable contact portion, a movable connecting portion, and a main body portion. The movable contact portion is connected to the main body portion via the movable connecting portion. The movable contact portion is used to contact the static contact or is provided with a movable contact point that cooperates with the static contact. From the length direction of the circuit breaker, the movable contact portion is closer to the static contact than the main body portion. Alternatively, the moving contact includes a moving contact portion, a moving connecting portion and a main body portion, the moving contact portion is connected to the main body portion through the moving connecting portion, the moving contact portion is used to contact the static contact or the moving contact portion is provided with a moving contact point that cooperates with the static contact, and the moving connecting portion is provided with an arc-isolating insulating part.

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