Installation structure of mutual inductor

Abstract

The utility model discloses a mutual inductor mounting structure which comprises a base, a mutual inductor, a first conductive piece, a moving contact and a first wiring piece. The first conductive piece, the moving contact and the mutual inductor are all arranged on the inner side of the base, the first wiring piece penetrates through the bottom surface of the base and is fixed with the first conductive piece, and the other end of the first wiring piece is arranged beyond the bottom surface of the base; seen from the height direction of the base, the first conductive piece sequentially comprises a connecting section, a middle section and a matching section, the connecting section is electrically connected with the moving contact, the middle section is used for sleeving the mutual inductor, and the matching section is used for being fixed with the first wiring piece; the axis direction of the central hole of the mutual inductor is parallel to the height direction of the base; the transformer has the characteristic that the transformer is more suitable for wiring behind a board.

Description

Technical Field

[0001] The present application relates to the electrical field, and more particularly to a molded case circuit breaker, and more particularly to an installation structure for a transformer. Background Art

[0002] Instrument transformers are widely used in molded case circuit breakers, such as current transformers in electronic molded case circuit breakers, zero-sequence transformers in leakage molded case circuit breakers, metering transformers in circuit breakers with metering functions, and so on.

[0003] The application of these mutual inductors is to be set on the main circuit conductor of the circuit breaker to sample the current information on the main circuit conductor, and then the controller of the circuit breaker performs the corresponding function according to the sampled current information. The set structure of the mutual inductor is shown in CN216871866U. However, in the molded case circuit breaker, it is divided into front-board wiring and rear-board wiring, such as CN219350117U. If the rear-board wiring method is adopted, and the above-mentioned setting method of the mutual inductor is adopted, the main circuit conductor inside the entire product will be too long, which is not conducive to reducing the volume of the entire product.

[0004] Therefore, how to design a setting method for the transformer suitable for the behind-the-panel wiring circuit breaker to make the internal main circuit conductor as compact as possible is a direction worthy of research. Summary of the invention

[0005] In view of this, the purpose of the present application is to overcome the deficiencies in the prior art and to provide a mounting structure for a transformer suitable for a molded case circuit breaker with rear panel wiring.

[0006] The present application provides: a mounting structure of a transformer, which includes a base, a transformer, a first conductive member, a moving contact and a first wiring member; the first conductive member, the moving contact and the transformer are all arranged on the inner side of the base, one end of the first wiring member is fixed to the first conductive member, and the other end of the first wiring member is arranged beyond the bottom surface of the base; viewed from the height direction of the base, the first conductive member includes a connecting section, an intermediate section and a matching section in sequence, the connecting section is electrically connected to the moving contact, the intermediate section is used for the transformer to be mounted, and the matching section is used to be fixed to the first wiring member; the axial direction of the center hole of the transformer is arranged parallel to the height direction of the base.

[0007] With this structure, the first conductive member includes a connecting section, an intermediate section and a matching section in sequence in the height direction. The mutual inductor is sleeved on the intermediate section and is located on the inner side of the base (the inner side here refers to the side of the base of the circuit breaker facing the cover of the circuit breaker). The first wiring member is fixed to the first conductive member and the other end of the first wiring member is arranged beyond the bottom surface of the base. Such a design simplifies the internal conductor structure, making the internal conductor shorter and more compact. Such a mutual inductor arrangement is more suitable for molded case circuit breakers with rear panel wiring.

[0008] In some embodiments of the present application, the transformer is one or more of a fast saturation transformer, a metering transformer, a Roche transformer, and an iron core transformer.

[0009] The installation structure of the mutual inductor is applicable to various types of mutual inductors or a combination of various mutual inductors.

[0010] In some embodiments of the present application, the first conductive member is electrically connected to the moving contact through a soft connection.

[0011] This structure is beneficial to the connection between the moving contact and the first conductive member.

[0012] In some embodiments of the present application, a first mounting hole group and a second mounting hole group are provided on the mating section; the first wiring member is fastened to the first mounting hole group or the second mounting hole group by bolts; when the first wiring member is fixed on the first mounting hole group, the portion of the first wiring member extending beyond the base is parallel to the first direction; when the first wiring member is fixed on the second mounting hole group, the portion of the first wiring member extending beyond the base is parallel to the second direction; the first direction and the second direction are perpendicularly arranged.

[0013] The use of this dual mounting hole group setting can satisfy the user's needs to realize the setting of terminal blocks in different orientations, such as vertical rows and horizontal rows, giving users more options.

[0014] In some embodiments of the present application, a first insulating ring-shaped structure surrounding the first wiring member is provided on the bottom surface of the base. The first insulating ring-shaped structure is integrally formed with the base and extends from the bottom surface of the base toward a direction away from the bottom surface; in the direction away from the bottom surface, the first wiring member is arranged beyond the first insulating ring-shaped structure.

[0015] The use of the first insulating ring-shaped structure can increase the creepage distance, thereby improving the insulation performance.

[0016] In some embodiments of the present application, the first wiring member includes a first fixing portion and a first external connection portion, and both sides of the first external connection portion in the length direction are arranged beyond the first fixing portion; bolts fasten the first fixing portion to the first mounting hole group or the second mounting hole group; the first insulating ring structure includes a first slot and a second slot; when the first fixing portion is fastened to the first mounting hole group, the first external connection portion is locked with the first slot; when the first fixing portion is fastened to the second mounting hole group, the first external connection portion is locked with the second slot.

[0017] This structure not only meets the insulation performance requirements, but also allows users to set terminal blocks in different orientations, such as vertical and horizontal rows, giving users more options.

[0018] In some embodiments of the present application, a second conductive member and a second wiring member are further included, the second conductive member is arranged in the base, and a first mounting hole group and a second mounting hole group are opened on the second conductive member; the second wiring member is fixed to the first mounting hole group on the second conductive member or to the second mounting hole group on the second conductive member by bolts; when the second wiring member is fixed to the first mounting hole group, the lower part of the second wiring member is arranged beyond the bottom surface of the base, and the exceeding part is arranged parallel to the first direction; when the first wiring member is fixed to the second mounting hole group, the lower part of the second wiring member is arranged beyond the bottom surface of the base, and the exceeding part is arranged parallel to the second direction; the first direction and the second direction are arranged perpendicularly.

[0019] The use of this dual mounting hole group setting can satisfy the user's needs to realize the setting of terminal blocks in different orientations, such as vertical rows and horizontal rows, giving users more options.

[0020] In some embodiments of the present application, a second insulating ring-shaped structure surrounding the second wiring member is provided on the bottom surface of the base. The second insulating ring-shaped structure is integrally formed with the base and extends from the bottom surface of the base toward a direction away from the bottom surface; in the direction away from the bottom surface, the second wiring member is arranged beyond the second insulating ring-shaped structure.

[0021] The use of the second insulating ring structure can increase the creepage distance, thereby improving the insulation performance.

[0022] In some embodiments of the present application, the second wiring member includes a second fixing portion and a second external connection portion, and both sides of the second external connection portion in the length direction are arranged beyond the second fixing portion; bolts fasten the second fixing portion to the first mounting hole group or the second mounting hole group; the second insulating ring structure includes a first slot and a second slot; when the second fixing portion is fastened to the first mounting hole group, the second external connection portion is locked with the first slot; when the second fixing portion is fastened to the second mounting hole group, the second external connection portion is locked with the second slot.

[0023] This structure not only meets the insulation performance requirements, but also allows users to set terminal blocks in different orientations, such as vertical and horizontal rows, giving users more options. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for use in the embodiments will be briefly introduced below. It should be understood that the following drawings only show certain embodiments of the present application and therefore should not be regarded as limiting the scope. For ordinary technicians in this field, other related drawings can be obtained based on these drawings without creative work.

[0025] Figure 1 A cross-sectional view of a molded case circuit breaker transformer according to an embodiment of the present application is shown;

[0026] Figure 2 A three-dimensional diagram of a molded case circuit breaker according to an embodiment of the present application is shown;

[0027] Figure 3 An exploded view of a molded case circuit breaker according to an embodiment of the present application is shown;

[0028] Figure 4 A schematic diagram of the structure of a base in a molded case circuit breaker in an embodiment of the present application is shown;

[0029] Figure 5 A structural schematic diagram showing another perspective of the base in the molded case circuit breaker in the embodiment of the present application;

[0030] Figure 6 A schematic diagram showing the structure of a first wiring member and a second wiring member in a molded case circuit breaker according to an embodiment of the present application is shown;

[0031] Figure 7 A schematic structural diagram of a first conductive member in a molded case circuit breaker according to an embodiment of the present application is shown;

[0032] Figure 8 A schematic structural diagram of a second conductive member in a molded case circuit breaker according to an embodiment of the present application is shown;

[0033] Fig. 9 A schematic diagram of the structure of a vertical row of molded case circuit breakers in an embodiment of the present application is shown;

[0034] Fig.10 A schematic diagram of the structure of a horizontal row in a molded case circuit breaker in an embodiment of the present application is shown;

[0035] Fig.11 A schematic diagram of the structure of a molded case circuit breaker with a phase partition according to an embodiment of the present application is shown;

[0036] Fig.12A cross-sectional view of the mounting structure of the operating mechanism of a molded case circuit breaker according to an embodiment of the present application is shown. DETAILED DESCRIPTION

[0037] The embodiments of the present application are described in detail below, and examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0038] 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" and the like indicate orientations or positional relationships 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 referred device or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present application.

[0039] In addition, the terms "first" and "second" are used for descriptive purposes only and should not be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Therefore, the features defined as "first" and "second" may explicitly or implicitly include one or more of the features. In the description of this application, "multiple" means two or more, unless otherwise clearly and specifically defined.

[0040] In this application, unless otherwise clearly specified and limited, the terms "installed", "connected", "electrically connected", "fixed" and the like should be understood in a broad sense, for example, it can be a fixed electrical connection, a detachable electrical connection, or an integrated one; it can be a mechanical electrical connection, or an electrical electrical connection; it can be directly connected, or indirectly connected through an intermediate medium, it can be the internal connection of two elements or the interaction relationship between two elements. For ordinary technicians in this field, the specific meanings of the above terms in this application can be understood according to specific circumstances.

[0041] In the present application, unless otherwise clearly specified and limited, a first feature being "above" or "below" a second feature may mean that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. Moreover, a first feature being "above", "above" or "above" a second feature may mean that the first feature is directly above or obliquely above the second feature, or simply means that the first feature is higher in level than the second feature. A first feature being "below", "below" or "below" a second feature may mean that the first feature is directly below or obliquely below the second feature, or simply means that the first feature is lower in level than the second feature. Example

[0042] like Figure 1-Figure 12 As shown, an embodiment of the present application is a molded case circuit breaker, which includes a housing, an operating mechanism 100, a rotating shaft 200, a conductive component, an arc extinguishing structure, a first wiring member 301, a second wiring member 302, a mutual inductor P, etc.

[0043] The installation structure of the transformer is arranged in the following manner:

[0044] The housing includes a base 303, a cover 304 and an upper cover. The cover 304 is located above the base 303, and the upper cover is located above the housing. The base 303, the cover 304 and the upper cover are fastened with bolts.

[0045] The base 303 is a hexahedral structure, including a front surface, a bottom surface 303b and four side surfaces. The four side surfaces here are the first long side wall side surface 303b1, the second long side wall side surface 303b2, the first short side wall side surface 303b3 and the second short side wall side surface 303b4. A plurality of phase installation spaces are formed on the front surface of the base 303. In this embodiment, since it is a three-pole circuit breaker, the number of phase installation spaces is three. In fact, the phase installation space is determined according to the number of poles of the circuit breaker. For example, in the case of a two-pole circuit breaker, the number of phase installation spaces is two; in the case of a four-pole circuit breaker, the number of phase installation spaces is four.

[0046] Each phase installation space has a first installation position 303a1 and a second installation position 303a2, wherein the first installation position 303a1 and the second installation position 303a2 are used to install the first conductive member 305 and the second conductive member 306 respectively. A first assembly groove 303a10 is formed at the first installation position 303a1, wherein the first assembly groove 303a10 is used to install a mutual inductor P, wherein the mutual inductor P can be a single mutual inductor or a combination of multiple mutual inductors P, wherein the mutual inductor P can be a fast saturation mutual inductor, a metering mutual inductor, a Roche mutual inductor, or an iron core mutual inductor. Here, the notch of the first assembly groove 303a10 is oriented away from the bottom surface 303b, and the notch of the first assembly groove 303a10 is oriented toward the cover body 304.

[0047] A first through hole 303a3 and a second through hole 303a4 are provided on the bottom surface 303b of the base 303, wherein the first through hole 303a3 corresponds to and is connected with the first mounting position 303a1, and the second through hole 303a4 corresponds to and is connected with the second mounting position 303a2. A first insulating ring-shaped structure 303b5 and a second insulating ring-shaped structure 303b6 are provided on the bottom surface 303b of the base 303, wherein the first insulating ring-shaped structure 303b5 and the second insulating ring-shaped structure 303b6 are integrally formed with the base 303. The first insulating ring-shaped structure 303b5 and the second insulating ring-shaped structure 303b6 extend in a direction away from the bottom surface 303b, wherein the first insulating ring-shaped structure 303b5 surrounds the first through hole 303a3, and the second insulating ring-shaped structure 303b6 surrounds the second through hole 303a4.

[0048] The conductive component includes a first conductive member 305 , a second conductive member 306 , a moving contact 307 and a stationary contact 308 .

[0049] From the height direction of the base 303, the first conductive member 305 includes a connecting section 3051, an intermediate section 3052 and a matching section 3053 in sequence. Here, the connecting section 3051 is connected to the moving contact through a soft connection. Of course, other ways of connection can also be used, such as a hard busbar. The mutual inductor P is sleeved on the intermediate section 3052, so that the axial direction of the center hole of the mutual inductor P is parallel to the height direction of the base 303. The matching section 3053 is provided with a first mounting hole group 30531 and a second mounting hole group 30532, where the first mounting hole group 30531 and the second mounting hole group 30532 are respectively arranged for different directions of different terminal blocks. Here, the first terminal 301 includes a first fixing portion 301a and a first external connection portion 301b. When the first fixing portion 301a is fixed to the first mounting hole group 30531 by screws, the first external connection portion 301b is parallel to the first direction, that is, parallel to the length direction of the base 303, and is in a vertical row. When the first fixing portion 301a is fixed to the second mounting hole group 30532 by screws, the first external connection portion 301b is parallel to the second direction, that is, parallel to the width direction of the base 303, and is in a horizontal row. No matter which mounting hole group the first fixing portion 301a is fixed to, the first external connection portion 301b will extend beyond the first insulating ring-shaped structure 303b5.

[0050] The second conductive member 306 and the static contact 308 are an integral part. In addition to the integral part, a split part can also be used to connect through a soft connection. The first mounting hole group 30531 and the second mounting hole group 30532 are also designed on the second conductive member 306, and the second wiring member 302 includes a second fixing portion 302a and a second external connection portion 302b. The fastening relationship between the second fixing portion 302a and the first mounting hole group 30531 and the second mounting hole group 30532 can refer to the fastening relationship between the first fixing portion 301a and the first mounting hole group 30531 and the second mounting hole group 30532 mentioned above, and will not be repeated here. No matter which group of mounting holes the first fixing portion 302a is fixed to, the first external connection portion 302b will extend beyond the second insulating ring structure 303b6.

[0051] The length direction dimensions of the first external connecting portion 301b and the second external connecting portion 302b are larger than the first fixing portion 301a and the second fixing portion 302a, that is, both ends of the length direction of the first external connecting portion 301b and the second external connecting portion 302b exceed the first fixing portion 301a and the second fixing portion 302a.

[0052] The structures of the first insulating ring-shaped structure 303b5 and the second insulating ring-shaped structure 303b6 are basically the same. Taking the first insulating ring-shaped structure 303b5 as an example, the first insulating ring-shaped structure 303b5 includes a first slot 303b5a and a second slot 303b5b. The length direction dimensions of the first slot 303b5a and the second slot 303b5b are both larger than the dimensions of the first through hole 303a3 and the second through hole 303a4 at the longest position. The first through hole 303a3 and the second through hole 303a4 are adapted to the first fixing portion 301a and the second fixing portion 302a, and the first slot 303b5a and the second slot 303b5b are used to install the first external connection portion 301b and the second external connection portion 302b. Here, the length direction of the first slot 303b5a is perpendicular to the length direction of the second slot 303b5b, and the length direction of the first slot 303b5a is parallel to the length direction of the first long side wall side 303b1. When the first external connection part 301b and the second external connection part 302b are both stuck in the first slot 303b5a, a vertical wiring arrangement is presented. When the first external connection part 301b and the second external connection part 302b are both stuck in the second slot 303b5b, a horizontal wiring arrangement is presented. When mixed wiring arrangement is required, the first external connection part 301b and the second external connection part 302b can be stuck in different slots according to corresponding requirements. This makes it convenient for users to set the corresponding wiring method according to their needs.

[0053] The specific transmission structure of the operating mechanism 100 is common knowledge in the art. The operating mechanism 100 here includes a frame 100a, which is fixed in the cover 304, specifically by bolts passing through the base 303, the cover 304 and the frame 100a. In this way, most of the structure of the mechanism (most of the structure is in the frame 100a) is away from the conductive components. The handle of the operating mechanism 100 here is partially beyond the cover 304, so as to facilitate user operation.

[0054] The rotating shaft 200 is rotatably arranged in the base 303, and the moving contact 307 is arranged on the rotating shaft 200. The rotating shaft 200 is connected to the output component (also called the lower connecting rod) of the operating mechanism 100, so that the user can operate the operating mechanism 100 to realize the rotation of the rotating shaft 200 to realize the connection and separation of the moving and static contacts 308.

[0055] Here, the bottom surface 303b has a recessed portion 303b7, and the bottom plate is installed in the recessed portion 303b7. The recessed portion 303b7 and the two recessed portions respectively surround all the first insulating ring-shaped structures 303b5 and the second insulating ring-shaped structures 303b6. Of course, one recessed portion 303b7 can also surround the first insulating ring-shaped structure 303b5 and the second insulating ring-shaped structure 303b6. The bottom plate and the base 303 are fixed by bonding or screw fastening.

[0056] With this structure, the bottom plate can be used to cover some mounting structures on the base 303, such as covering mounting screws of the operating mechanism 100.

[0057] The closed surface here means that there is no installation groove (there will be an installation groove in the prior art to facilitate wiring in front of the panel). With this structure, the circuit breaker base 303 is dedicated to the situation of wiring behind the panel. Since there is no installation groove, the insulation performance is further enhanced, and it is also avoided that there is a need to find a way to block the installation groove when wiring behind the panel is used in the prior art.

[0058] The above-mentioned circuit breaker is applicable to both conventional circuit breakers (having both front-panel wiring and rear-panel wiring) and special circuit breakers (circuit breakers having only rear-panel wiring). For example, the circuit breaker in this embodiment is a circuit breaker that can only perform rear-panel wiring. The short side wall side and the second short side wall side 303b4 of the installation structure 303 of this transformer are closed surfaces and do not have installation grooves, so front-panel wiring cannot be performed.

[0059] In the description of this specification, the description with reference to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present application. In this specification, the schematic representation of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described may be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art may combine and combine different embodiments or examples and features of different embodiments or examples described in this specification without contradiction.

[0060] Although the embodiments of the present application have been shown and described above, it can be understood that the above embodiments are exemplary 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. A mounting structure for a mutual inductor, characterized in that: It includes a base, a mutual inductor, a first conductive part, a moving contact and a first wiring member; the first conductive part, the moving contact and the mutual inductor are all arranged on the inner side of the base, one end of the first wiring member is fixed to the first conductive part, and the other end is arranged beyond the bottom surface of the base; viewed from the height direction of the base, the first conductive part includes a connecting section, an intermediate section and a matching section in sequence, the connecting section is electrically connected to the moving contact, the intermediate section is used for the mutual inductor to be mounted, and the matching section is used to be fixed to the first wiring member; the axial direction of the central hole of the mutual inductor is arranged parallel to the height direction of the base.

2. The installation structure of a mutual inductor according to claim 1, characterized in that: The mutual inductor is one or more of a fast saturation mutual inductor, a metering mutual inductor, a Roche mutual inductor, and an iron core mutual inductor.

3. The installation structure of a mutual inductor according to claim 1, characterized in that: It also includes a first assembly groove, the opening of which is oriented away from the bottom surface of the base, and the first assembly groove is used for placing the mutual inductor.

4. The installation structure of a mutual inductor according to claim 1, characterized in that: The first conductive member is electrically connected to the moving contact through a soft connection.

5. The installation structure of a mutual inductor according to claim 1, characterized in that: The mating section is provided with a first mounting hole group and a second mounting hole group; the first wiring member is fastened to the first mounting hole group or the second mounting hole group by bolts; when the first wiring member is fixed to the first mounting hole group, the portion of the first wiring member extending beyond the base is arranged parallel to the first direction; when the first wiring member is fixed to the second mounting hole group, the portion of the first wiring member extending beyond the base is arranged parallel to the second direction; the first direction and the second direction are arranged perpendicularly.

6. The installation structure of a mutual inductor according to claim 5, characterized in that: A first insulating ring-shaped structure surrounding the first wiring member is arranged on the bottom surface of the base. The first insulating ring-shaped structure is integrally formed with the base and extends from the bottom surface of the base toward a direction away from the bottom surface; in the direction away from the bottom surface, the first wiring member is arranged beyond the first insulating ring-shaped structure.

7. The installation structure of a mutual inductor according to claim 6, characterized in that: The first wiring member includes a first fixing portion and a first external connection portion, and both sides of the first external connection portion in the length direction are arranged beyond the first fixing portion; the first fixing portion is fastened with the first mounting hole group or the second mounting hole group by bolts; the first insulating ring structure includes a first slot and a second slot; when the first fixing portion is fastened with the first mounting hole group, the first external connection portion is locked with the first slot; when the first fixing portion is fastened with the second mounting hole group, the first external connection portion is locked with the second slot.

8. The installation structure of a mutual inductor according to claim 1, characterized in that: It also includes a second conductive member and a second wiring member, the second conductive member is arranged in the base, and the second conductive member is provided with a first mounting hole group and a second mounting hole group; the second wiring member is fixed to the first mounting hole group on the second conductive member or to the second mounting hole group on the second conductive member by bolts; when the second wiring member is fixed to the first mounting hole group, the lower part of the second wiring member is arranged beyond the bottom surface of the base, and the exceeding part is arranged parallel to the first direction; when the first wiring member is fixed to the second mounting hole group, the lower part of the second wiring member is arranged beyond the bottom surface of the base, and the exceeding part is arranged parallel to the second direction; the first direction and the second direction are arranged perpendicularly.

9. The installation structure of a mutual inductor according to claim 8, characterized in that: A second insulating ring-shaped structure surrounding the second wiring member is arranged on the bottom surface of the base. The second insulating ring-shaped structure is integrally formed with the base and extends from the bottom surface of the base toward a direction away from the bottom surface; in the direction away from the bottom surface, the second wiring member is arranged beyond the second insulating ring-shaped structure.

10. The installation structure of a mutual inductor according to claim 9, characterized in that: The second wiring member includes a second fixing portion and a second external connection portion, and both sides of the second external connection portion in the length direction are arranged beyond the second fixing portion; the second fixing portion is fastened with the first mounting hole group or the second mounting hole group by bolts; the second insulating ring structure includes a first slot and a second slot; when the second fixing portion is fastened with the first mounting hole group, the second external connection portion is locked with the first slot; when the second fixing portion is fastened with the second mounting hole group, the second external connection portion is locked with the second slot.

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