Accessory wiring structure of explosion-proof circuit breaker

Abstract

The utility model discloses an accessory wiring structure of an explosion-proof circuit breaker, which comprises a shell and a fastener, an installation space is arranged in the shell, and an accessory is arranged in the installation space; an accessory insert nut is embedded in the shell, and one end of the accessory insert nut is exposed out of the shell to realize external wiring through a fastener; the other end of the accessory insert nut is exposed in the mounting space and is electrically connected with a lead of the accessory; the explosion-proof circuit breaker has the characteristic of being more suitable for explosion-proof circuit breakers.

Description

Technical Field

[0001] The present application relates to the electrical field of low-voltage switches, and in particular to an accessory wiring structure for an explosion-proof circuit breaker. Background Art

[0002] Existing explosion-proof circuit breakers are often implemented by installing a miniature circuit breaker inside a housing. For example, the structure disclosed in CN102959663B is relatively easy to manufacture, as it can simply be installed into the housing by purchasing an existing miniature circuit breaker. If accessories are added to this type of circuit breaker, such as shunt trips, auxiliary accessories, and alarm accessories, these are also installed as miniature circuit breaker accessories, assembled on the side of the miniature circuit breaker, as shown in CN118213243A.

[0003] However, the existing wiring method of this accessory is not suitable for the situation where the accessory is built into the circuit breaker body. Summary of the Invention

[0004] In view of this, the purpose of this application is to overcome the deficiencies in the prior art and to provide an accessory wiring structure for an explosion-proof circuit breaker.

[0005] The present application provides: an accessory wiring structure for an explosion-proof circuit breaker, which includes a housing and a fastener. An installation space is provided inside the housing, and an accessory is arranged in the installation space; an accessory insert nut is embedded in the housing, one end of the accessory insert nut is exposed outside the housing and external wiring is achieved through the fastener; the other end of the accessory insert nut is exposed in the installation space and is electrically connected to the lead of the accessory.

[0006] In some embodiments of the present application, a rotating part is further provided in the installation space, and the rotating part is rotatably arranged with respect to the shell, and the rotating part has a first position corresponding to the closed state of the explosion-proof circuit breaker, and a second position corresponding to the open state of the explosion-proof circuit breaker; the accessory is a mechanical switch accessory, and the rotating part includes a trigger part, and the mechanical switch accessory is located in the rotation trajectory of the trigger part. Through the position change of the rotating part, the trigger part changes the action relationship on the mechanical switch accessory to realize the state conversion of the mechanical switch accessory.

[0007] In some embodiments of the present application, the mechanical switch accessory includes an accessory bracket and a switch body. The accessory bracket is clamped on the wall of the installation space, and the switch body is fixed on the accessory bracket.

[0008] In some embodiments of the present application, a first plug-in portion is provided on the wall of the installation space, the first plug-in portion and the accessory insert nut are concentrically arranged, and an adaptive second plug-in portion is provided on the accessory bracket, and the second plug-in portion is clamped in the first plug-in portion.

[0009] In some embodiments of the present application, the accessory bracket is provided with a mounting slot and a hook, the switch body is disposed in the mounting slot, and the hook is engaged with the switch body to restrict it from being separated from the mounting slot.

[0010] In some embodiments of the present application, a positioning rib is provided on the accessory bracket, and the lead of the mechanical switch accessory is electrically connected to the accessory insert nut through a wiring piece, and a positioning groove adapted to the positioning rib is provided on the wiring piece, and the positioning groove is sleeved on the positioning rib.

[0011] In some embodiments of the present application, a positioning hole is provided on the accessory bracket, and a positioning boss is provided on the wall of the installation space. After the accessory bracket is clamped on the wall of the installation space, the positioning boss is located in the positioning hole.

[0012] In some embodiments of the present application, an operating mechanism is further provided in the installation space, and the operating mechanism has a closed state and an open state; the accessory is a tripper-type accessory, and the tripper-type accessory includes a push rod, which corresponds to the operating mechanism; when the tripper-type accessory is actuated, the push rod triggers the operating mechanism to change it from the closed state to the open state.

[0013] In some embodiments of the present application, the lead of the accessory is electrically connected to the accessory insert nut via a terminal lug, and the terminal lug and the accessory insert nut are fastened by screws or fixed by welding or arranged by abutment.

[0014] In some embodiments of the present application, the accessory is a tripper-type accessory, which includes two leads, and the wiring tabs corresponding to the two leads are a first wiring tab and a second wiring tab; the second wiring tab is inclined toward the direction of the first wiring tab, and the first wiring tab and the second wiring tab are set at an obtuse angle.

[0015] In some embodiments of the present application, a separation rib is provided in the housing. The separation rib is provided on an end of the second terminal piece close to the first terminal piece, and is used to separate the first terminal piece from the second terminal piece.

[0016] In some embodiments of the present application, the shell includes a cover shell and a sealing plate, the bottom of the cover shell has an installation opening connected to the installation space, and the sealing plate is used to close the installation opening; the accessory has a first guide portion, and a second guide portion is provided on the wall of the installation space. When the accessory is loaded into the installation space from the bottom of the cover shell, the accessory is installed by sliding along the second guide portion through the first guide portion.

[0017] The beneficial effects of this application include:

[0018] This application uses an accessory insert nut embedded in the housing, with one end of the nut exposed in the installation space for wiring with the accessory (internal wiring), and the other end of the nut located in the accessory wiring slot to mate with the fastener (for external wiring). This uses the accessory insert nut to act as a transfer, achieving wiring between the accessory and the outside, providing a better seal and making it more suitable for use in explosion-proof circuit breakers. Wiring is also very convenient. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] 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.

[0020] Figure 1 A perspective view of an explosion-proof circuit breaker according to embodiment 1 of the present application is shown;

[0021] Figure 2 A schematic diagram of an accessory insert nut and a housing of an explosion-proof circuit breaker according to Example 1 of the present application is shown;

[0022] Figure 3 An exploded view of the explosion-proof circuit breaker according to Example 1 of the present application is shown;

[0023] Figure 4 A schematic diagram showing the accessory wiring structure of the explosion-proof circuit breaker according to Example 1 of the present application is shown;

[0024] Figure 5 A schematic diagram of a mechanical switch accessory in an explosion-proof circuit breaker according to Example 1 of the present application is shown;

[0025] Figure 6 A schematic diagram showing a mechanical switch accessory of an explosion-proof circuit breaker in Example 1 of the present application being triggered is shown;

[0026] Figure 7 A schematic diagram showing that the mechanical switch accessory of the explosion-proof circuit breaker in Example 1 of the present application is not triggered;

[0027] Figure 8 A schematic diagram of a middle tripper accessory of an explosion-proof circuit breaker according to embodiment 1 of the present application is shown;

[0028] Figure 9 A schematic diagram of a central tripper accessory and a locking assembly of an explosion-proof circuit breaker in Example 1 of the present application is shown;

[0029] Figure 10 A three-dimensional view of the explosion-proof circuit breaker of Example 1 of the present application after the sealing plate is removed is shown;

[0030] Figure 11 A schematic diagram showing another perspective of the explosion-proof circuit breaker after the sealing plate is removed in Example 1 of the present application is shown. DETAILED DESCRIPTION

[0031] 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.

[0032] 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.

[0033] 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.

[0034] 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.

[0035] 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

[0036] like Figures 1-11 As shown, embodiment 1 of the present application provides an accessory wiring structure for an explosion-proof circuit breaker. This accessory wiring structure for an explosion-proof circuit breaker is suitable for explosion-proof circuit breakers, especially for explosion-proof circuit breakers in which structures such as operating mechanisms and moving contacts are directly arranged on the housing 100.

[0037] The specific structure of the accessory wiring structure of this explosion-proof circuit breaker includes the following structures:

[0038] The housing 100 defines an installation space 100a. 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, contact system, and accessories 1100. 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 single-pole 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 contact system. For an explosion-proof circuit breaker with two or more poles, the internal installation space 100a is divided into multiple subspaces. Multi-pole explosion-proof circuit breakers have multiple contact systems, and multiple subspaces are required to achieve phase isolation. Although divided into multiple subspaces, the installation space 100a is, in essence, used to house internal components such as the operating mechanism 300, contact system, and accessories 1100.

[0039] Accessory 1100 is installed in installation space 100a and has leads 1101. Accessory 1100 can be of various types, including mechanical switch accessories 1100 (e.g., auxiliary accessories, alarm accessories, etc., which provide feedback or output of open and close signals) or trip device accessories 1100b (e.g., shunt releases, residual current releases, which provide tripping functions). Specific types of accessory 1100 and their configuration are described in detail below.

[0040] The accessory insert nut 1102 (also known as the insert nut) is embedded within the housing 100, with one end of the accessory insert nut 1102 exposed outside the housing 100. This exposure outside the housing 100 can mean that one end extends beyond the housing 100, or it can be flush with or slightly below the surface of the housing 100. The end exposed on the housing 100 surface is used to connect to external wires via fasteners. The fasteners used here are screws, which facilitate wiring. Preferably, the housing 100 is provided with an accessory wiring slot 1000, with one end of the accessory insert nut 1102 exposed within the accessory wiring slot 1000, and the fastener is disposed within the accessory wiring slot 1000.

[0041] The other end of the accessory insert nut 1102 is exposed in the installation space 100 a , so that the lead 1101 of the accessory 1100 can be electrically connected to the end of the accessory insert nut 1102 exposed in the installation space 100 a .

[0042] The above structure utilizes the accessory insert nut 1102 embedded in the housing 100 to act as a signal relay, thereby connecting the accessory 1100 in the housing 100 with an external circuit (such as a mechanical switch accessory 1100, a switching signal feedback circuit; such as a release accessory 1100b, a release coil control circuit), which has a better sealing effect and is more suitable for explosion-proof circuit breakers.

[0043] Here, each accessory 1100 has two leads 1101 , and therefore, the number of the corresponding accessory insert nuts 1102 , fasteners, and accessory wiring slots 1000 is two.

[0044] For these accessories 1100, their leads 1101 are connected to lugs 1103, for example, by welding. The lugs 1103 are then electrically connected to the corresponding accessory insert nuts 1102, for example, by screws, welding, or simply by abutting the lugs 1103 against the accessory insert nuts 1102. Regardless of the method, the lugs 1103 serve as a bridge between the leads 1101 and the accessory insert nuts 1102 because the material of the lugs 1103 is harder than that of the leads 1101, making the electrical connection more stable and easier to operate.

[0045] There are many forms of accessories 1100, including mechanical switch accessories 1100a and trip device accessories 1100b.

[0046] Taking the mechanical switch accessory 1100a as an example, it is used to cooperate with the rotating part 201, and the signal changes when driven by the rotating part 201. There are many types of common mechanical switch accessories 1100a, such as auxiliary accessories 1100 and alarm accessories 1100 (the uses of auxiliary accessories 1100 and alarm accessories 1100 are conventional technical means in this field and will not be repeated here).

[0047] This triggering method can be used for both auxiliary and alarm accessories. Specifically, a rotating member 201 is disposed within the installation space 100a. This rotating member 201 can be part of the moving portion of the circuit breaker's operating mechanism or the contact support. Whether it's part of the operating mechanism or the contact support, it changes position when the circuit breaker is in the closed or open state. This position change can alter the triggering method for the mechanical switch accessory 1100a. In this embodiment, the rotating member 201 is part of the operating mechanism and has a first position (corresponding to the closed state) and a second position (corresponding to the open state). A trigger portion 201f is disposed on the rotating member 201. The mechanical switch accessory 1100a is located within the rotational trajectory of the trigger portion 201f. The rotation of the rotating member 201 changes the interaction with the trigger portion 201f, thereby achieving state transitions for the mechanical switch accessory 1100a. It can be understood that when the rotating member 201 is in the first position, the trigger portion 201f and the mechanical switch accessory 1100 are in a first interaction relationship; when the rotating member 201 is in the second position, the trigger portion 201f and the mechanical switch accessory 1100 are in a second interaction relationship. The first interaction relationship and the second interaction relationship are diametrically opposed. For example, if the first interaction relationship is triggered, the second interaction relationship is not triggered; conversely, if the first interaction relationship is not triggered, the second interaction relationship is triggered.

[0048] The mechanical switch accessory 1100a has two contact types: normally closed and normally open. Therefore, depending on the type of mechanical switch accessory 1100a and the first and second interaction relationships, the rotating member 201 and the mechanical switch accessory 1100a can interact in four ways:

[0049] The contact form is normally closed, the first action relationship is triggered (the contact of the mechanical switch type is converted to open), and the second action relationship is not triggered (the contact of the mechanical switch type returns to normally closed).

[0050] The contact form is normally closed, the first action relationship is untriggered (the contacts of the mechanical switch type return to normally closed), and the second action relationship is triggered (the contacts of the mechanical switch type change to open).

[0051] The contact form is normally open, the first action relationship is triggered (the contact of the mechanical switch type is changed to closed), and the second action relationship is not triggered (the contact of the mechanical switch type returns to normally open).

[0052] The contact form is normally open, the first action relationship is untriggered (the contact of the mechanical switch type returns to normally open), and the second action relationship is triggered (the contact of the mechanical switch type changes to closed).

[0053] Regardless of which of the above methods is used, the state transition of the mechanical switch accessory 1100a is very simple and direct, and the response is very fast.

[0054] The specific installation structure of this mechanical switch accessory 1100a includes an accessory bracket 1100a1 and a switch body 1100a2. The switch body 1100a2 is fixed to the accessory bracket 1100a1 and is used to cooperate with the trigger unit 201f to achieve state transitions. The accessory bracket 1100a1 is fixed to the wall of the installation space 100a. A first plug-in portion 100a0 is provided on the wall of the installation space 100a. The first plug-in portion 100a0 is oriented in the direction of the explosion-proof circuit breaker. The accessory bracket 1100a1 is provided with a matching second plug-in portion 1100a7. The second plug-in portion 1100a7 and the first plug-in portion 100a0 form the aforementioned locking arrangement. Here, the first plug-in portion 100a0 is a slot, and the second plug-in portion 1100a7 is a post. Of course, in order to make the overall space more compact, there are two first plug-in parts 100a0 here, and the position of the first plug-in part 100a0 is exactly the position of the two accessory insert nuts 1102 corresponding to this accessory 1100, that is, the first plug-in part 100a0 and the accessory insert nut 1102 (from the height direction of the explosion-proof circuit breaker, the accessory insert nut 1102 is located above the first plug-in part 100a0) are concentrically arranged, which can make the overall installation structure more compact.

[0055] The switch body 1100a2 is a microswitch, but a travel switch is also possible. The accessory bracket 1100a1 has a mounting slot 1100a3, into which the switch body 1100a2 is inserted. A hook 1100a4 is located near the insertion opening of the mounting slot 1100a3. Once inserted, the switch body 1100a2 is locked by the hook 1100a4, preventing it from falling out.

[0056] The accessory bracket 1100a1 also has a positioning hole 1100a5. This positioning hole 1100a5 cooperates with a positioning boss 100a1 on the wall of the installation space 100a. This allows the accessory bracket 1100a1 to be positioned in the wall of the installation space 100a, with the positioning boss 100a1 positioned in the positioning hole 1100a5. This positioning and cooperation ensures a more stable installation of the accessory bracket 1100a1.

[0057] The accessory bracket 1100a1 is provided with a positioning rib 1100a6. The terminal lug 1103 corresponding to the lead 1101 of the mechanical switch accessory 1100 is partially mounted on the positioning rib 1100a6. Specifically, the terminal lug 1103 is provided with a positioning groove 11030 that mates with the positioning rib 1100a6, allowing the terminal lug 1103 to be securely mounted on the positioning rib 1100a6 for connection to the accessory insert nut 1102. This structure allows the positioning rib 1100a6 to secure the terminal lug 1103, preventing problems such as improperly positioned terminal lug 1103, which could lead to inconvenience in connecting the terminal lug 1103 to the accessory insert nut 1102, or causing welds between the terminal lug 1103 and the lead 1101 to become loose.

[0058] For example, a trip device accessory 1100b is designed to work with an operating mechanism. Upon receiving a signal, it unlocks the operating mechanism, allowing the previously closed operating mechanism 300 to open. There are many types of trip device accessories 1100b, such as residual current releases, shunt releases, and over / undervoltage releases. These releases all utilize electromagnets to trigger the unlocking of the operating mechanism, but the triggering mechanisms differ (residual current releases trigger when a line leakage occurs, shunt releases trigger when a remote signal is received, and over / undervoltage releases trigger when a line overvoltage or undervoltage occurs).

[0059] Regardless of the specific type of trip unit described above, its triggering method is as follows. Specifically, an operating mechanism is located within the installation space 100a. The operating mechanism has both closed and open states. In the closed state, it is maintained in the closed position by a latch assembly 3010. The trip unit includes a push rod 1100b1, which serves as its actuating rod. The trip unit utilizes the electromagnet principle (the specific structure of the electromagnet principle will not be described again, as it is conventional in the art). Push rod 1100b1 corresponds to the latch assembly 3010 of the operating mechanism (in the closed state, the operating mechanism 300 is maintained in the closed state by the latch assembly 3010). Therefore, when the trip unit is actuated, push rod 1100b1 unlocks the latch assembly 3010, allowing the operating mechanism 300 to perform the opening operation and trip the explosion-proof circuit breaker. Of course, the latch assembly 3010 can be driven by either pushing or pulling, as long as it unlocks the latch assembly 3010.

[0060] The trip unit also has two leads 1101, corresponding to two lugs 1103. These two lugs 1103 are a first lug 1103a and a second lug 1103b. One end of the second lug 1103b is connected to its corresponding accessory insert nut 1102 (the specific connection method has been described above and will not be repeated here). The other end of the second lug 1103b extends toward the first lug 1103a. The first lug 1103a, on the other hand, is connected to its corresponding accessory insert nut 1102 at one end and extends away from the accessory insert nut 1102 at the other end. Therefore, an obtuse angle A is formed between the first lug 1103a and the second lug 1103b. This allows for a more compact arrangement of the two lugs 1103, resulting in a more streamlined overall structure.

[0061] A separating rib 100a3 is formed on the wall of the installation space 100a. The separating rib 100a3 is located between the first and second connecting lugs 1103a, 1103b, and increases the creepage distance therebetween. The separating rib 100a3 can be formed in a variety of ways, such as simply providing a protruding rib between the first and second connecting lugs 1103a, 1103b. Alternatively, as shown in the figure, the first and second connecting lugs 1103a, 1103b each have a groove structure, with the groove walls forming the separating rib 100a3.

[0062] Whether it is a tripper-type accessory 1100b or a mechanical switch-type accessory 1100a, they are all installed into the installation space 100a from the bottom of the shell 100. Specifically, there is a first guide portion on the accessory 1100, and a second guide portion is provided on the wall of the installation space 100a. During installation, the first guide portion can move along the second guide portion to realize the installation of the accessory 1100.

[0063] 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 seals installation opening 100ak. A glue potting structure surrounds installation opening 100ak between sealing plate 102 and cover 101, enhancing the sealing performance of housing 100 and meeting explosion-proof requirements.

[0064] The specific structures of the first guide portion and the second guide portion vary depending on the form of the accessory 1100.

[0065] For example, a trip unit accessory 1100b includes a trip unit housing 1100b2, with a mounting portion 1100b3 formed on one side. Mounting portion 1100b3 is the first guide. The second guide is a protrusion 100a4. Mounting portion 1100b3 can slide in unison from mounting opening 100ak along protrusion 100a4 and then be secured to housing 101 with screws. While the second guide is a protrusion 100a4, it could also be a groove, or a combination of a protrusion 100a4 and a groove.

[0066] Taking the mechanical switch-like accessory 1100a as an example, its first guide portion is the second plug-in portion 1100a7, and the second guide portion is the first plug-in portion 100a0. The first plug-in portion 100a0 extends all the way to the mounting opening 100ak. This allows the second plug-in portion 1100a7 to be installed along the first plug-in portion 100a0 during assembly. Once installed, the accessory bracket 1100a1 can be secured to the housing 101 using either a single screw or other components (for example, by using a fixed contact assembly to press against the accessory bracket 1100a1, ensuring stable assembly).

[0067] Such a guide structure can realize the rapid assembly of the explosion-proof circuit breaker, making the installation smoother.

[0068] The explosion-proof circuit breaker is not required to include all the above-mentioned types of accessories 1100. It may include only mechanical switch accessories 1100a, or only trip unit accessories 1100b, or both types of accessories 1100.

[0069] And depending on the number of poles of the explosion-proof circuit breaker, the types of accessories 1100 it contains may also be different.

[0070] Taking a single-pole explosion-proof circuit breaker as an example, the installation space 100a involved is relatively small, and there may be only one mechanical switch-type accessory 1100a (one of the auxiliary accessory and the alarm accessory), or only one release-type accessory 1100b (one of the shunt release, the leakage release, and the over- or under-voltage release); or there may be both one mechanical switch-type accessory 1100a (one of the auxiliary accessory and the alarm accessory) and one release-type accessory 1100b (one of the shunt release, the leakage release, and the over- or under-voltage release).

[0071] Because the space for a 1-pole explosion-proof circuit breaker is relatively small, the above detailed examples of the selection of accessories 1100 are given. However, the installation space 100a involved in 2-pole, 3-pole, and 4-pole explosion-proof circuit breakers is relatively large, and there are many types of accessories 1100 that can be installed. Therefore, the design can be based on actual conditions, and examples will not be given one by one here.

[0072] 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.

[0073] 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 accessory wiring structure for an explosion-proof circuit breaker, characterized by: It includes a shell and a fastener. An installation space is opened inside the shell, and accessories are arranged in the installation space. An accessory insert nut is embedded in the shell, and one end of the accessory insert nut is exposed outside the shell and external wiring is achieved through the fastener; the other end of the accessory insert nut is exposed in the installation space and is electrically connected to the lead of the accessory.

2. The accessory wiring structure of an explosion-proof circuit breaker according to claim 1, characterized in that: A rotating part is also provided in the installation space, and the rotating part is rotatably arranged with respect to the shell. The rotating part has a first position corresponding to the closed state of the explosion-proof circuit breaker, and a second position corresponding to the open state of the explosion-proof circuit breaker; the accessory is a mechanical switch accessory, and the rotating part includes a trigger part. The mechanical switch accessory is located in the rotation trajectory of the trigger part. Through the position change of the rotating part, the trigger part changes the action relationship on the mechanical switch accessory to realize the state conversion of the mechanical switch accessory.

3. The accessory wiring structure of an explosion-proof circuit breaker according to claim 2, characterized in that: Mechanical switch accessories include an accessory bracket and a switch body. The accessory bracket is clamped on the wall of the installation space, and the switch body is fixed on the accessory bracket.

4. The accessory wiring structure of an explosion-proof circuit breaker according to claim 3, characterized in that: A first plug-in portion is provided on the wall of the installation space, and the first plug-in portion is concentrically arranged with the accessory insert nut. A matching second plug-in portion is provided on the accessory bracket, and the second plug-in portion is clamped in the first plug-in portion.

5. The accessory wiring structure of an explosion-proof circuit breaker according to claim 3, characterized in that: The accessory bracket is provided with a mounting slot and a hook, the switch body is arranged in the mounting slot, and the hook is engaged with the switch body to prevent it from being separated from the mounting slot; And / or, the accessory bracket is provided with a positioning rib, the lead of the mechanical switch accessory is electrically connected to the accessory insert nut via a wiring lug, the wiring lug is provided with a positioning groove adapted to the positioning rib, and the positioning groove is sleeved on the positioning rib; And / or, a positioning hole is provided on the accessory bracket, and a positioning boss is provided on the wall of the installation space, and after the accessory bracket is clamped on the wall of the installation space, the positioning boss is located in the positioning hole.

6. The accessory wiring structure of an explosion-proof circuit breaker according to claim 1, characterized in that: An operating mechanism is also provided in the installation space, and the operating mechanism has a closing state and an opening state; the accessory is a tripper-type accessory, and the tripper-type accessory includes a push rod, which corresponds to the operating mechanism; when the tripper-type accessory is actuated, the push rod triggers the operating mechanism to change it from the closing state to the opening state.

7. The accessory wiring structure of an explosion-proof circuit breaker according to claim 1, characterized in that: The lead wire of the accessory is electrically connected to the accessory insert nut via the connection piece, and the connection piece and the accessory insert nut are fastened by screws or fixed by welding or arranged by abutment.

8. The accessory wiring structure of an explosion-proof circuit breaker according to claim 7, characterized in that: The accessory is a trip device accessory, which includes two leads, and the connecting pieces corresponding to the two leads are a first connecting piece and a second connecting piece respectively; the second connecting piece is inclined toward the direction where the first connecting piece is located, and the first connecting piece and the second connecting piece are arranged at an obtuse angle.

9. The accessory wiring structure of an explosion-proof circuit breaker according to claim 8, characterized in that: A separation rib is provided in the shell body. The separation rib is provided on one end of the second connecting piece close to the first connecting piece and is used to separate the first connecting piece from the second connecting piece.

10. The accessory wiring structure of an explosion-proof circuit breaker according to claim 1, characterized in that: The shell includes a cover and a sealing plate. The bottom of the cover has an installation opening connected to the installation space, and the sealing plate is used to close the installation opening. The accessory has a first guide portion, and a second guide portion is provided on the wall of the installation space. When the accessory is loaded into the installation space from the bottom of the cover, the accessory is installed by sliding along the second guide portion through the first guide portion.

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