CN217562863U - Top extension connecting piece and connecting device - Google Patents

Abstract

The utility model relates to a top extension connecting piece and connecting device, this connecting piece include the cross joint, the cross joint includes interior semi-conductive layer, outer semi-conductive layer and intermediate insulation layer, the cross joint includes first interface, second interface, third interface and the fourth interface that sets up towards different directions respectively, first interface is used for cooperating with the end cap, the second interface, the third interface is used for cooperating with the generating line respectively, the fourth interface is used for cooperating with the sleeve pipe of regulator cubicle; the inner semi-conducting layer comprises a connecting part, and a first mounting hole for allowing a fastening piece to pass through is formed in the connecting part. Be different from prior art, the utility model discloses can be provided with two three way connection end to end, the centre is provided with one or more than four way connection, makes the regulator cubicle more than three be connected, makes things convenient for the regulator cubicle more than three to carry out and cabinet.

Description

Top extension connecting piece and connecting device

Technical Field

The utility model relates to an electrical control cabinet technical field, in particular to top extension connecting piece and connecting device.

Background

The existing top expansion connecting piece is suitable for the top or bottom full-insulation and full-sealing connection of equipment such as an inflatable cabinet and the like, and has two types, namely a shielding type and a non-shielding type. The full-insulation and full-sealing connection is realized, and the fatal defect caused by high-voltage exposure in severe weather is completely avoided. The size of a product interface meets the design of a C-type sleeve in the standard EN50180-50181, and the electrical performance meets the requirements in IEC60502 and GB 12706.4.

In a utility model patent with patent publication number CN203225492U, a built-in bus connection structure for cabinet combination is disclosed, comprising a cabinet combination bus and two bi-pass sleeves respectively embedded on side plates of air boxes of different switch cabinets, wherein a metal connecting piece is arranged in the bi-pass sleeves, an inner connecting end of the metal connecting piece is provided with an inner connecting hole, and an outer connecting end of the metal connecting piece is provided with an outer connecting hole; and the cabinet combining bus comprises an insulating outer sleeve and metal connecting columns wrapped in the insulating outer sleeve, and two ends of each metal connecting column are exposed out of two sides of the insulating outer sleeve.

In the process of implementing the present invention, the inventor finds the following problems in the prior art:

the existing top expansion connecting piece is large in size and inconvenient to detach, and the existing top expansion connecting piece cannot connect more than three electrical cabinets together.

SUMMERY OF THE UTILITY MODEL

Therefore, a top expansion connecting piece and a connecting device are needed to be provided for solving the technical problem that the existing top expansion connecting piece cannot connect more than three electrical cabinets together.

To achieve the above object, the inventors provide a top expansion joint comprising:

the four-way joint comprises an inner semi-conducting layer, an outer semi-conducting layer and an intermediate insulating layer, the inner semi-conducting layer, the intermediate insulating layer and the outer semi-conducting layer are sequentially arranged from inside to outside, the four-way joint comprises a first interface, a second interface, a third interface and a fourth interface which are respectively arranged towards different directions, the first interface is used for being matched with a plug, the second interface and the third interface are respectively used for being matched with a bus, and the fourth interface is used for being matched with a sleeve of an electrical cabinet;

the inner semi-conducting layer comprises a connecting part, and a first mounting hole for allowing a fastening piece to pass through is formed in the connecting part.

Different from the prior art, the technical scheme of the application includes that a four-way joint comprises a first interface, a second interface, a third interface and a fourth interface which are respectively arranged towards different directions, the first interface is used for being matched with a plug, the second interface and the third interface are respectively used for being matched with a bus, and the fourth interface is used for being matched with a sleeve of an electrical cabinet; so, can be connected with two generating lines respectively through second interface, third interface, the sleeve pipe can set up in the fourth interface, can solve among the prior art problem that top extension connecting piece can't link together the regulator cubicle more than three, can be provided with two three way connection end to end, and the centre is provided with one or more than four way connection, makes the regulator cubicle more than three be connected, makes things convenient for the regulator cubicle more than three to carry out the cabinet combining.

As an implementation manner of the present invention, the top expansion connecting piece further includes a fastening piece, one end of the fastening piece is detachably connected to the sleeve, and both ends of the bus bar are provided with bus bar mounting holes;

the other end of the fastener sequentially penetrates through the bus mounting hole of the first bus, the first mounting hole and the bus mounting hole of the second bus and is detachably connected with the nut. So, can link together two generating lines, cross joint and sleeve pipe through a fastener, conveniently dismantle the installation of top extension connecting piece through the fastener, also conveniently dismantle the generating line.

As an embodiment of the present invention, the fastener is a stud bolt, the first interface and the fourth interface are respectively set towards the vertical direction, the cavity for accommodating the nut is provided in the plug, the top of the stud bolt is connected with the nut by screw thread. So, when using, can fix the stud on the sleeve pipe earlier, the stud passes first generating line mounting hole, first mounting hole, second generating line mounting hole in proper order again and nut screw thread can dismantle and be connected, conveniently forms to dismantle to being connected between four way connection and the sleeve pipe.

As an embodiment of the present invention, the sleeve is provided with a threaded mounting hole, and the bottom of the stud bolt is connected to the threaded mounting hole by a thread. Thus, through the threaded mounting hole, the stud bolt can be in threaded connection with the sleeve.

As an embodiment of the utility model, the nut with be provided with between the connecting portion bullet pad and flat the pad, the nut the bullet pad the flat pad sets gradually in the cavity. So, through being provided with between nut and the connecting portion and play to fill up and flat the pad, flat the pad is for increasing screw atress face, and the bullet pad is in order to prevent that the screw is not hard up, plays a quantitative buffer protection effect during the atress.

As an embodiment of the present invention, the top expansion connector further includes a plug, the plug is detachably disposed in the first interface. So, can dismantle the setting in first interface through the end cap, conveniently install the end cap.

As an embodiment of the present invention, the first interface is disposed upward, the top expansion connector further includes a protective cap, and the protective cap is disposed on the first interface. So, can further avoid dust, water to get into the cross joint through the helmet in, improve the security of cross joint, avoid unexpected emergence.

As an embodiment of the present invention, both ends of the bus bar are respectively provided with a first extending portion and a second extending portion extending along the horizontal direction, the first extending portion is provided with the second extending portion, the second interface is provided with the third interface, the third interface is disposed towards the horizontal direction, the first extending portion and the second extending portion can be located above or below the connecting portion. So, can be located the top or the below of connecting portion through first extension and second extension, make things convenient for the cross joint to fix a position two generating lines, the both ends of generating line all can be connected with the cross joint, can effectively improve the commonality of generating line.

To achieve the above object, the inventor also provides a top expansion joint device comprising the top expansion joint as described in any one of the above inventor.

Be different from prior art, the connecting device of the technical scheme of this application can be connected with two generating lines respectively through second interface, third interface, and the sleeve pipe can set up in the fourth interface, can solve the problem that top expanded joint spare can't link together the regulator cubicle more than three among the prior art, can be provided with two three way connection end to end, and the centre is provided with one or more than four way connection, makes the regulator cubicle more than three be connected, makes things convenient for the regulator cubicle more than three to carry out the cabinet combining.

The above description of the present invention is only an overview of the technical solutions of the present application, and in order to make the technical solutions of the present application more clearly understood by those skilled in the art, the present invention may be further implemented according to the content described in the text and the drawings of the present application, and in order to make the above objects, other objects, features, and advantages of the present application more easily understood, the following description is made in conjunction with the detailed description of the present application and the drawings.

Drawings

The drawings are only for purposes of illustrating the principles, implementations, applications, features, and effects of particular embodiments of the present application, as well as others related thereto, and are not to be construed as limiting the application.

In the drawings of the specification:

FIG. 1 is a schematic view of a top expansion joint according to an embodiment of the present application;

FIG. 2 is an exploded view of a top expansion joint according to one embodiment of the present application;

FIG. 3 is a schematic structural diagram of a four-way joint according to one embodiment of the present application;

FIG. 4 is a schematic structural view of a tee fitting according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a bus bar according to an embodiment of the present application.

The reference numerals referred to in the above figures are explained below:

1. the four-way joint is connected with the four-way joint,

11. an inner semi-conducting layer, which is,

111. a first mounting hole is formed in the first mounting hole,

112. a connecting part which is connected with the connecting part,

12. an outer semi-conducting layer, which is,

13. an intermediate insulating layer is provided between the first and second insulating layers,

14. a first interface for the first and the second communication interfaces,

15. the second interface is connected with the first interface,

16. a third interface for the first and second communication devices,

17. a plug is arranged at the bottom of the container,

171. the cavity body is provided with a cavity body,

18. a nut is arranged on the upper surface of the shell,

19. the elastic pad is arranged on the upper surface of the elastic pad,

20. the flat cushion is arranged on the upper surface of the main body,

21. the cushion block is arranged on the upper surface of the frame,

22. a fourth interface for the second communication unit to be connected to the second communication unit,

2. a fastener member for fastening the fastener member to the body,

3. a bus bar is arranged on the base plate,

31. a bus bar mounting hole is formed in the bus bar mounting hole,

32. a first extension part which is arranged at the first side of the frame,

33. a second extension part which is arranged at the second side of the frame,

4. the casing pipe is provided with a plurality of casing pipes,

41. a threaded mounting hole is arranged on the base plate,

5. a three-way joint is arranged on the upper end of the main body,

6. a protective cap.

Detailed Description

In order to explain in detail possible application scenarios, technical principles, practical embodiments, and the like of the present application, the following detailed description is given with reference to the accompanying drawings in conjunction with the listed embodiments. The embodiments described herein are only used for clearly illustrating the technical solutions of the present application, and therefore are only used as examples, and the scope of the present application is not limited thereby.

Reference herein to "an embodiment" means that a particular feature, structure, or characteristic described in connection with the embodiment can be included in at least one embodiment of the application. The appearances of the phrase "in one embodiment" in various places in the specification are not necessarily all referring to the same embodiment, nor are separate or related to other embodiments specifically defined. In principle, in the present application, the technical features mentioned in the embodiments can be combined in any manner to form a corresponding implementable solution as long as there is no technical contradiction or conflict.

Unless otherwise defined, technical terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this application belongs; the use of relational terms herein is intended only to describe particular embodiments and is not intended to limit the present application.

In the description of the present application, the term "and/or" is a expression for describing a logical relationship between objects, indicating that three relationships may exist, for example, a and/or B, indicating that: there are three cases of A, B, and both A and B. In addition, the character "/" herein generally indicates that the former and latter associated objects are in a logical relationship of "or".

In this application, terms such as "first" and "second" are used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions.

Without further limitation, in this application, the use of the phrases "comprising," "including," "having," or other similar expressions, is intended to cover a non-exclusive inclusion, and these expressions do not exclude the presence of additional elements in a process, method, or article that includes the elements, such that a process, method, or article that includes a list of elements may include not only those elements defined, but other elements not expressly listed, or may include other elements inherent to such process, method, or article.

As is understood in the "review guidelines," in this application, the terms "greater than," "less than," "more than," and the like are to be understood as excluding the number; the expressions "above", "below", "within" and the like are understood to include the present numbers. In addition, in the description of the embodiments of the present application, "a plurality" means two or more (including two), and expressions related to "a plurality" similar thereto are also understood, for example, "a plurality of groups", "a plurality of times", and the like, unless specifically defined otherwise.

In the description of the embodiments of the present application, spatially relative expressions such as "central," "longitudinal," "lateral," "length," "width," "thickness," "upper," "lower," "front," "rear," "left," "right," "vertical," "horizontal," "vertical," "top," "bottom," "inner," "outer," "clockwise," "counterclockwise," "axial," "radial," "circumferential," and the like are used, and the indicated orientations or positional relationships are based on the orientations or positional relationships shown in the specific embodiments or drawings and are for convenience of description of the specific embodiments of the present application or for ease of understanding by the reader only, and do not indicate or imply that a device or component referred to must have a specific position, a specific orientation, or be configured or operated in a specific orientation and therefore should not be construed as limiting the embodiments of the present application.

Unless specifically stated or limited otherwise, the terms "mounted," "connected," "secured," and "disposed" used in the description of the embodiments of the present application are to be construed broadly. For example, the connection can be a fixed connection, a detachable connection, or an integrated connection; it can be a mechanical connection, an electrical connection, or a communication connection; they may be directly connected or indirectly connected through an intermediate; which may be communication within two elements or an interaction of two elements. Specific meanings of the above terms in the embodiments of the present application can be understood by those skilled in the art to which the present application pertains in accordance with specific situations.

The existing top expansion connecting piece is suitable for top or bottom full-insulation and full-sealing connection of equipment such as an inflatable cabinet and the like, and has two types of shielding type and non-shielding type. The full-insulation and full-sealing connection is realized, and the fatal defect caused by high-voltage exposure in severe weather is completely avoided.

The existing top expansion connecting piece is large in size and inconvenient to detach, basically all is a two-way connector or a three-way connector, the two-way connector only can connect two electrical cabinets in series, and one end of the three-way connector is plugged by a plug 17 and cannot connect the electrical cabinets more than three together.

The applicant has found that it is possible to provide a four-way connector 1, wherein a first interface is provided for cooperating with a plug 17, a second interface 15 and a third interface 16 are provided for cooperating with a busbar 3, respectively, and a fourth interface 22 is provided for cooperating with a bushing 4 of an electrical cabinet. In the use, can be provided with two three way connection 5 from beginning to end, the centre is provided with one or more than four way connection 1, makes more than three regulator cubicles connect, makes things convenient for more than three regulator cubicles to carry out the cabinet combining.

The top extension connecting piece and the top extension connecting device related to the embodiment can be applied to cabinet combination of various electrical cabinets and can connect more than three electrical cabinets.

According to some embodiments of the present application, please refer to fig. 1 to 5, the present embodiment relates to a top expansion connection, including a four-way joint 1, the four-way joint 1 includes an inner semi-conducting layer 11, an outer semi-conducting layer 12 and an intermediate insulating layer 13, the inner semi-conducting layer 11, the intermediate insulating layer 13 and the outer semi-conducting layer 12 are sequentially disposed from inside to outside, the four-way joint 1 includes a first interface 14, a second interface 15, a third interface 16 and a fourth interface 22 respectively disposed facing different directions, the first interface is configured to be matched with a plug 17, the second interface 15 and the third interface 16 are respectively configured to be matched with a bus 3, and the fourth interface 22 is configured to be matched with a bushing 4 of an electrical cabinet; the inner semiconductive layer 11 includes a connection portion 112, and the connection portion 112 is provided with a first mounting hole 111 through which the fastening member 2 passes.

In this embodiment, the three-way joint 5 and the four-way joint 1 are also provided with an inner semi-conducting layer 11, an intermediate insulating layer 13 and an outer semi-conducting layer 12, and are formed by injection molding of ethylene propylene diene monomer. The structure is a full-insulation, full-sealing and full-shielding layer electrified touch type three-way joint 5 and a four-way joint 1.

The surface of the conductor is added with a layer of shielding layer made of a semi-conductive material, the inside and the outside of the main insulating layer are provided with semiconductor layers, the inner semiconductor layer fills the air gap between the conductor and the insulating layer and the unevenness on the surface of the conductor to form a smooth surface to be combined with the insulating layer, and the electric field distribution between the insulating layer and the conductor is ensured to be as uniform as possible. In addition, the outer semiconductor layer also has the functions of discharging induced charges and uniform potential gradient. The two semiconductor layers form an equidistant surface inside and outside the main insulating layer, which is also an important condition for ensuring the uniform change of the electric field.

The cable conductor is formed by twisting a plurality of conducting wires, an air gap is easily formed between the cable conductor and the insulating layer, the surface of the cable conductor is not smooth, and electric field concentration can be caused. A shielding layer of semi-conductive material is added on the surface of the conductor, and the shielding layer is equipotential with the shielded conductor and is in good contact with the insulating layer, so that partial discharge between the conductor and the insulating layer is avoided, and the shielding layer is an inner shielding layer.

The bus 3 (bus line) is made of high-conductivity copper (copper bar) and aluminum materials, is used for transmitting electric energy, and has the capacity of collecting and distributing electric power. The power station or the transformer substation is used for transmitting the main lead for electric energy. Through which the electrical energy output by the generator, transformer or rectifier is delivered to the individual users or other substations. Mathematically, it refers to a straight line that moves under certain conditions to produce a surface.

One end of the three-way joint 5 is sealed by a plug 17, the other two ends are connected with the three-phase electricity of the electrical equipment, and the other end is electrically connected with the bus 3. One end of the four-way joint 1 is sealed by a plug 17, one end of the four-way joint is electrically connected with three-phase electricity of the electrical equipment, the other two ends of the four-way joint are respectively electrically connected with the two buses 3, and the four-way joint 1 is used as a middle connecting piece of the whole top expansion connecting device. Three cabinets of three phases are connected, one cabinet is connected with a three-way joint 5 and a four-way joint 1, and then the three-way joint 5 is connected, and the three phases are the structures which need to be used. If four cabinets are connected, a four-way joint 1 is added, and the like.

In this embodiment, mainly, the structure of the four-way joint 1 is intended to be protected, and the structure of the three-way joint 5 is similar to that of the four-way joint 1, and the specific principle will not be described again.

In this embodiment, the four-way joint 1 includes a first interface 14, a second interface 15, a third interface 16, and a fourth interface 22 that are respectively disposed facing different directions, where the first interface is used to cooperate with the plug 17, the second interface 15 and the third interface 16 are respectively used to cooperate with the bus bar 3, and the fourth interface 22 is used to cooperate with the bushing 4 of the electrical cabinet.

So, can be connected with two generating lines 3 respectively through second interface 15, third interface 16, sleeve pipe 4 can set up in fourth interface 22, can solve the problem that the top extension connecting piece can't link together the regulator cubicle more than three among the prior art, can be provided with two three way connection 5 from beginning to end, and the centre is provided with one or more than one four way connection 1, makes the regulator cubicle more than three be connected, makes things convenient for the regulator cubicle more than three to carry out the cabinet combining.

According to some embodiments of the present application, optionally, the top expansion connecting piece further includes a fastening piece 2, one end of the fastening piece 2 is detachably connected to the sleeve 4, and both ends of the bus bar 3 are provided with bus bar mounting holes 31; the other end of the fastener 2 passes through the bus bar mounting hole 31 of the first bus bar 3, the first mounting hole 111 and the bus bar mounting hole 31 of the second bus bar 3 in sequence and is detachably connected with the nut 18.

The fastener 2 is a stud bolt of M16/M12, the lower half section is a thread of M16, and the upper half section is a thread of M12.

So, can link together two generating lines 3, four way connection 1 and sleeve pipe 4 through a fastener 2, conveniently dismantle the installation of top extension connecting piece through fastener 2, also conveniently dismantle generating line 3.

According to some embodiments of the present application, optionally, the fastening element 2 is a stud, the first interface and the fourth interface 22 are respectively disposed toward the vertical direction, a cavity 171 for accommodating the nut 18 is disposed in the plug 17, and the top of the stud is in threaded connection with the nut 18.

So, when using, can fix stud on sleeve pipe 4 earlier, stud passes first generating line mounting hole 31, first mounting hole 111, second generating line mounting hole 31 in proper order again and nut 18 screw thread can dismantle the connection, conveniently forms to dismantle between four way connection 1 and the sleeve pipe 4 and is connected.

According to some embodiments of the present application, optionally, the sleeve 4 is provided with a threaded mounting hole 41, and the bottom of the stud bolt is screwed with the threaded mounting hole 41.

The threaded mounting holes 41 are threaded holes.

In this manner, the threaded connection between the stud bolt and the sleeve 4 is established by means of the threaded mounting hole 41.

According to some embodiments of the present application, optionally, an elastic pad 19 and a flat pad 20 are disposed between the nut 18 and the connecting portion 112, and the nut 18, the elastic pad 19 and the flat pad 20 are sequentially disposed in the cavity 171.

As described above, the elastic washer 19 and the flat washer 20 are provided between the nut 18 and the connecting portion 112, the flat washer 20 is provided to increase the force receiving surface of the screw, and the elastic washer 19 plays a certain amount of buffer protection when receiving a force in order to prevent the screw from loosening.

According to some embodiments of the present application, optionally, the top expansion connector further comprises a plug 17, and the plug 17 is detachably disposed in the first interface 14.

Therefore, the plug 17 is detachably arranged in the first interface 14, and the plug 17 is convenient to install.

According to some embodiments of the present application, optionally, the first interface 14 is disposed upward, and the top expansion joint further includes a protective cap 6, wherein the protective cap 6 covers the first interface 14.

So, can further avoid dust, water to get into four way connection 1 in through helmet 6, improve four way connection 1's security, avoid unexpected emergence.

According to some embodiments of the present application, optionally, a first extending portion 32 and a second extending portion 33 extending along a horizontal direction are respectively disposed at two ends of the bus bar 3, a bus bar mounting hole 31 is disposed on each of the first extending portion 32 and the second extending portion 33, the second interface 15 and the third interface 16 are respectively disposed towards the horizontal direction, and the first extending portion 32 and the second extending portion 33 may be located above or below the connecting portion 112.

So, can be located the top or the below of connecting portion 112 through first extension 32 and second extension 33, make things convenient for four way connection 1 to fix a position two generating lines 3, the both ends of generating line 3 all can be connected with four way connection 1, can effectively improve generating line 3's commonality.

The embodiment also relates to a top expansion connecting device, which comprises any one of the top expansion connecting pieces, the three-way joint 5, the bus bar and the electrical cabinet. The top expansion connecting piece mainly comprises a four-way joint 1, a three-way joint 5, a bus and an electrical cabinet, and the top expansion connecting piece comprises the following specific installation steps:

A. fastening the M16/M12 threaded fastener 2 on the sleeve 4, and screwing the M16 end into the sleeve 4;

B. cleaning the matching surfaces of the three-way joint 5, the four-way joint 1 and the sleeve 4, and then uniformly coating a layer of silicone grease;

C. the three-way joint 5 and the four-way joint 1 are arranged at two ends of the bus 3, and the bus mounting hole 31 is ensured to be over against the threaded mounting hole 41 after the bus is mounted;

D. sleeving a cushion block 21 on one end of the three-way joint 5, wherein the cushion block 21 is positioned on the other side of the bus 3, and the thickness of the cushion block 21 is the same as that of the bus 3 and is used for filling the thickness of the bus 3;

E. installing the three-way joint 5 and the four-way joint 1 on the sleeves 4 of the two electrical cabinets, and enabling the threaded fastener 2 to penetrate through the bus mounting hole 31;

F. sequentially loading a cushion block 21, a flat pad 20, an elastic pad 19 and a nut 18, and screwing by using a tool;

G. attaching a binding belt on the surface of the sleeve 4 for exhausting air, screwing a plug 17 coated with silicone grease after cleaning, screwing the plug with a tool (the moment is less than or equal to 30N x m), and pulling out the binding belt;

H. sheathing a protective cap 6;

I. and the ground wire is connected, so that the ground wire is reliably grounded.

Be different from prior art, the connecting device of the technical scheme of this application, through second interface 15, third interface 16 can be connected with two generating lines 3 respectively, sleeve pipe 4 can set up in fourth interface 22, can solve among the prior art problem that top extension connecting piece can't link together the regulator cubicle more than three, can be provided with two three way connection 5 from beginning to end, the centre is provided with one or more than one four way connection 1, make the regulator cubicle more than three be connected, make things convenient for the regulator cubicle more than three to carry out the cabinet combining.

It should be noted that, although the above embodiments have been described herein, the scope of the present invention is not limited thereby. Therefore, based on the innovative concept of the present invention, changes and modifications made to the embodiments described herein, or equivalent structures or equivalent flow changes made by using the contents of the specification and the drawings of the present invention, directly or indirectly apply the above technical solutions to other related technical fields, all included in the scope of the present invention.

Claims (9)

1. A top expansion joint, comprising:

the four-way joint comprises an inner semi-conducting layer, an outer semi-conducting layer and an intermediate insulating layer, the inner semi-conducting layer, the intermediate insulating layer and the outer semi-conducting layer are sequentially arranged from inside to outside, the four-way joint comprises a first interface, a second interface, a third interface and a fourth interface which are respectively arranged towards different directions, the first interface is used for being matched with a plug, the second interface and the third interface are respectively used for being matched with a bus, and the fourth interface is used for being matched with a sleeve of an electrical cabinet;

the inner semi-conducting layer comprises a connecting portion, and a first mounting hole allowing a fastening piece to pass through is formed in the connecting portion.

2. The top extension connector of claim 1 further comprising a fastener, one end of the fastener being removably coupled to the bushing, both ends of the bus bar having bus bar mounting holes;

the other end of the fastener sequentially penetrates through the bus mounting hole of the first bus, the first mounting hole and the bus mounting hole of the second bus and is detachably connected with the nut.

3. The top extension connector of claim 2, wherein the fastener is a stud, the first port and the fourth port are respectively disposed in a vertical direction, a cavity for receiving the nut is disposed in the plug, and the top of the stud is in threaded connection with the nut.

4. The top expansion joint of claim 3, wherein said sleeve has a threaded mounting hole, and wherein said threaded bolt has a bottom portion threadedly engaged with said threaded mounting hole.

5. The top extension connector of claim 3, wherein an elastic pad and a flat pad are disposed between the nut and the connecting portion, and the nut, the elastic pad and the flat pad are sequentially disposed in the cavity.

6. The top expansion joint of claim 1, further comprising a plug removably disposed within the first interface.

7. The top expansion joint of claim 6, wherein the first header is disposed upwardly, the top expansion joint further comprising a protective cap that is capped over the first header.

8. The top expansion joint according to claim 1, wherein a first extension portion and a second extension portion extending in a horizontal direction are respectively disposed at two ends of the bus bar, bus bar mounting holes are disposed on the first extension portion and the second extension portion, the second interface and the third interface are horizontally disposed, and the first extension portion and the second extension portion are located above or below the connection portion.

9. A top expansion joint comprising the top expansion joint of any one of claims 1 to 8.

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